1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3 *
4 * Driver for Option High Speed Mobile Devices.
5 *
6 * Copyright (C) 2008 Option International
7 * Filip Aben <f.aben@option.com>
8 * Denis Joseph Barrow <d.barow@option.com>
9 * Jan Dumon <j.dumon@option.com>
10 * Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
11 * <ajb@spheresystems.co.uk>
12 * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
13 * Copyright (C) 2008 Novell, Inc.
14 *
15 *****************************************************************************/
16
17 /******************************************************************************
18 *
19 * Description of the device:
20 *
21 * Interface 0: Contains the IP network interface on the bulk end points.
22 * The multiplexed serial ports are using the interrupt and
23 * control endpoints.
24 * Interrupt contains a bitmap telling which multiplexed
25 * serialport needs servicing.
26 *
27 * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
28 * port is opened, as this have a huge impact on the network port
29 * throughput.
30 *
31 * Interface 2: Standard modem interface - circuit switched interface, this
32 * can be used to make a standard ppp connection however it
33 * should not be used in conjunction with the IP network interface
34 * enabled for USB performance reasons i.e. if using this set
35 * ideally disable_net=1.
36 *
37 *****************************************************************************/
38
39 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40
41 #include <linux/sched/signal.h>
42 #include <linux/slab.h>
43 #include <linux/init.h>
44 #include <linux/delay.h>
45 #include <linux/netdevice.h>
46 #include <linux/module.h>
47 #include <linux/ethtool.h>
48 #include <linux/usb.h>
49 #include <linux/tty.h>
50 #include <linux/tty_driver.h>
51 #include <linux/tty_flip.h>
52 #include <linux/kmod.h>
53 #include <linux/rfkill.h>
54 #include <linux/ip.h>
55 #include <linux/uaccess.h>
56 #include <linux/usb/cdc.h>
57 #include <net/arp.h>
58 #include <asm/byteorder.h>
59 #include <linux/serial_core.h>
60 #include <linux/serial.h>
61
62
63 #define MOD_AUTHOR "Option Wireless"
64 #define MOD_DESCRIPTION "USB High Speed Option driver"
65
66 #define HSO_MAX_NET_DEVICES 10
67 #define HSO__MAX_MTU 2048
68 #define DEFAULT_MTU 1500
69 #define DEFAULT_MRU 1500
70
71 #define CTRL_URB_RX_SIZE 1024
72 #define CTRL_URB_TX_SIZE 64
73
74 #define BULK_URB_RX_SIZE 4096
75 #define BULK_URB_TX_SIZE 8192
76
77 #define MUX_BULK_RX_BUF_SIZE HSO__MAX_MTU
78 #define MUX_BULK_TX_BUF_SIZE HSO__MAX_MTU
79 #define MUX_BULK_RX_BUF_COUNT 4
80 #define USB_TYPE_OPTION_VENDOR 0x20
81
82 /* These definitions are used with the struct hso_net flags element */
83 /* - use *_bit operations on it. (bit indices not values.) */
84 #define HSO_NET_RUNNING 0
85
86 #define HSO_NET_TX_TIMEOUT (HZ*10)
87
88 #define HSO_SERIAL_MAGIC 0x48534f31
89
90 /* Number of ttys to handle */
91 #define HSO_SERIAL_TTY_MINORS 256
92
93 #define MAX_RX_URBS 2
94
95 /*****************************************************************************/
96 /* Debugging functions */
97 /*****************************************************************************/
98 #define hso_dbg(lvl, fmt, ...) \
99 do { \
100 if ((lvl) & debug) \
101 pr_info("[%d:%s] " fmt, \
102 __LINE__, __func__, ##__VA_ARGS__); \
103 } while (0)
104
105 /*****************************************************************************/
106 /* Enumerators */
107 /*****************************************************************************/
108 enum pkt_parse_state {
109 WAIT_IP,
110 WAIT_DATA,
111 WAIT_SYNC
112 };
113
114 /*****************************************************************************/
115 /* Structs */
116 /*****************************************************************************/
117
118 struct hso_shared_int {
119 struct usb_endpoint_descriptor *intr_endp;
120 void *shared_intr_buf;
121 struct urb *shared_intr_urb;
122 struct usb_device *usb;
123 int use_count;
124 int ref_count;
125 struct mutex shared_int_lock;
126 };
127
128 struct hso_net {
129 struct hso_device *parent;
130 struct net_device *net;
131 struct rfkill *rfkill;
132 char name[24];
133
134 struct usb_endpoint_descriptor *in_endp;
135 struct usb_endpoint_descriptor *out_endp;
136
137 struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
138 struct urb *mux_bulk_tx_urb;
139 void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
140 void *mux_bulk_tx_buf;
141
142 struct sk_buff *skb_rx_buf;
143 struct sk_buff *skb_tx_buf;
144
145 enum pkt_parse_state rx_parse_state;
146 spinlock_t net_lock;
147
148 unsigned short rx_buf_size;
149 unsigned short rx_buf_missing;
150 struct iphdr rx_ip_hdr;
151
152 unsigned long flags;
153 };
154
155 enum rx_ctrl_state{
156 RX_IDLE,
157 RX_SENT,
158 RX_PENDING
159 };
160
161 #define BM_REQUEST_TYPE (0xa1)
162 #define B_NOTIFICATION (0x20)
163 #define W_VALUE (0x0)
164 #define W_LENGTH (0x2)
165
166 #define B_OVERRUN (0x1<<6)
167 #define B_PARITY (0x1<<5)
168 #define B_FRAMING (0x1<<4)
169 #define B_RING_SIGNAL (0x1<<3)
170 #define B_BREAK (0x1<<2)
171 #define B_TX_CARRIER (0x1<<1)
172 #define B_RX_CARRIER (0x1<<0)
173
174 struct hso_serial_state_notification {
175 u8 bmRequestType;
176 u8 bNotification;
177 u16 wValue;
178 u16 wIndex;
179 u16 wLength;
180 u16 UART_state_bitmap;
181 } __packed;
182
183 struct hso_tiocmget {
184 struct mutex mutex;
185 wait_queue_head_t waitq;
186 int intr_completed;
187 struct usb_endpoint_descriptor *endp;
188 struct urb *urb;
189 struct hso_serial_state_notification *serial_state_notification;
190 u16 prev_UART_state_bitmap;
191 struct uart_icount icount;
192 };
193
194
195 struct hso_serial {
196 struct hso_device *parent;
197 int magic;
198 u8 minor;
199
200 struct hso_shared_int *shared_int;
201
202 /* rx/tx urb could be either a bulk urb or a control urb depending
203 on which serial port it is used on. */
204 struct urb *rx_urb[MAX_RX_URBS];
205 u8 num_rx_urbs;
206 u8 *rx_data[MAX_RX_URBS];
207 u16 rx_data_length; /* should contain allocated length */
208
209 struct urb *tx_urb;
210 u8 *tx_data;
211 u8 *tx_buffer;
212 u16 tx_data_length; /* should contain allocated length */
213 u16 tx_data_count;
214 u16 tx_buffer_count;
215 struct usb_ctrlrequest ctrl_req_tx;
216 struct usb_ctrlrequest ctrl_req_rx;
217
218 struct usb_endpoint_descriptor *in_endp;
219 struct usb_endpoint_descriptor *out_endp;
220
221 enum rx_ctrl_state rx_state;
222 u8 rts_state;
223 u8 dtr_state;
224 unsigned tx_urb_used:1;
225
226 struct tty_port port;
227 /* from usb_serial_port */
228 spinlock_t serial_lock;
229
230 int (*write_data) (struct hso_serial *serial);
231 struct hso_tiocmget *tiocmget;
232 /* Hacks required to get flow control
233 * working on the serial receive buffers
234 * so as not to drop characters on the floor.
235 */
236 int curr_rx_urb_idx;
237 u8 rx_urb_filled[MAX_RX_URBS];
238 struct tasklet_struct unthrottle_tasklet;
239 };
240
241 struct hso_device {
242 union {
243 struct hso_serial *dev_serial;
244 struct hso_net *dev_net;
245 } port_data;
246
247 u32 port_spec;
248
249 u8 is_active;
250 u8 usb_gone;
251 struct work_struct async_get_intf;
252 struct work_struct async_put_intf;
253
254 struct usb_device *usb;
255 struct usb_interface *interface;
256
257 struct device *dev;
258 struct kref ref;
259 struct mutex mutex;
260 };
261
262 /* Type of interface */
263 #define HSO_INTF_MASK 0xFF00
264 #define HSO_INTF_MUX 0x0100
265 #define HSO_INTF_BULK 0x0200
266
267 /* Type of port */
268 #define HSO_PORT_MASK 0xFF
269 #define HSO_PORT_NO_PORT 0x0
270 #define HSO_PORT_CONTROL 0x1
271 #define HSO_PORT_APP 0x2
272 #define HSO_PORT_GPS 0x3
273 #define HSO_PORT_PCSC 0x4
274 #define HSO_PORT_APP2 0x5
275 #define HSO_PORT_GPS_CONTROL 0x6
276 #define HSO_PORT_MSD 0x7
277 #define HSO_PORT_VOICE 0x8
278 #define HSO_PORT_DIAG2 0x9
279 #define HSO_PORT_DIAG 0x10
280 #define HSO_PORT_MODEM 0x11
281 #define HSO_PORT_NETWORK 0x12
282
283 /* Additional device info */
284 #define HSO_INFO_MASK 0xFF000000
285 #define HSO_INFO_CRC_BUG 0x01000000
286
287 /*****************************************************************************/
288 /* Prototypes */
289 /*****************************************************************************/
290 /* Serial driver functions */
291 static int hso_serial_tiocmset(struct tty_struct *tty,
292 unsigned int set, unsigned int clear);
293 static void ctrl_callback(struct urb *urb);
294 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
295 static void hso_kick_transmit(struct hso_serial *serial);
296 /* Helper functions */
297 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
298 struct usb_device *usb, gfp_t gfp);
299 static void handle_usb_error(int status, const char *function,
300 struct hso_device *hso_dev);
301 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
302 int type, int dir);
303 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
304 static void hso_free_interface(struct usb_interface *intf);
305 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
306 static int hso_stop_serial_device(struct hso_device *hso_dev);
307 static int hso_start_net_device(struct hso_device *hso_dev);
308 static void hso_free_shared_int(struct hso_shared_int *shared_int);
309 static int hso_stop_net_device(struct hso_device *hso_dev);
310 static void hso_serial_ref_free(struct kref *ref);
311 static void hso_std_serial_read_bulk_callback(struct urb *urb);
312 static int hso_mux_serial_read(struct hso_serial *serial);
313 static void async_get_intf(struct work_struct *data);
314 static void async_put_intf(struct work_struct *data);
315 static int hso_put_activity(struct hso_device *hso_dev);
316 static int hso_get_activity(struct hso_device *hso_dev);
317 static void tiocmget_intr_callback(struct urb *urb);
318 /*****************************************************************************/
319 /* Helping functions */
320 /*****************************************************************************/
321
322 /* #define DEBUG */
323
dev2net(struct hso_device * hso_dev)324 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
325 {
326 return hso_dev->port_data.dev_net;
327 }
328
dev2ser(struct hso_device * hso_dev)329 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
330 {
331 return hso_dev->port_data.dev_serial;
332 }
333
334 /* Debugging functions */
335 #ifdef DEBUG
dbg_dump(int line_count,const char * func_name,unsigned char * buf,unsigned int len)336 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
337 unsigned int len)
338 {
339 static char name[255];
340
341 sprintf(name, "hso[%d:%s]", line_count, func_name);
342 print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
343 }
344
345 #define DUMP(buf_, len_) \
346 dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
347
348 #define DUMP1(buf_, len_) \
349 do { \
350 if (0x01 & debug) \
351 DUMP(buf_, len_); \
352 } while (0)
353 #else
354 #define DUMP(buf_, len_)
355 #define DUMP1(buf_, len_)
356 #endif
357
358 /* module parameters */
359 static int debug;
360 static int tty_major;
361 static int disable_net;
362
363 /* driver info */
364 static const char driver_name[] = "hso";
365 static const char tty_filename[] = "ttyHS";
366 static const char *version = __FILE__ ": " MOD_AUTHOR;
367 /* the usb driver itself (registered in hso_init) */
368 static struct usb_driver hso_driver;
369 /* serial structures */
370 static struct tty_driver *tty_drv;
371 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
372 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
373 static DEFINE_SPINLOCK(serial_table_lock);
374
375 static const s32 default_port_spec[] = {
376 HSO_INTF_MUX | HSO_PORT_NETWORK,
377 HSO_INTF_BULK | HSO_PORT_DIAG,
378 HSO_INTF_BULK | HSO_PORT_MODEM,
379 0
380 };
381
382 static const s32 icon321_port_spec[] = {
383 HSO_INTF_MUX | HSO_PORT_NETWORK,
384 HSO_INTF_BULK | HSO_PORT_DIAG2,
385 HSO_INTF_BULK | HSO_PORT_MODEM,
386 HSO_INTF_BULK | HSO_PORT_DIAG,
387 0
388 };
389
390 #define default_port_device(vendor, product) \
391 USB_DEVICE(vendor, product), \
392 .driver_info = (kernel_ulong_t)default_port_spec
393
394 #define icon321_port_device(vendor, product) \
395 USB_DEVICE(vendor, product), \
396 .driver_info = (kernel_ulong_t)icon321_port_spec
397
398 /* list of devices we support */
399 static const struct usb_device_id hso_ids[] = {
400 {default_port_device(0x0af0, 0x6711)},
401 {default_port_device(0x0af0, 0x6731)},
402 {default_port_device(0x0af0, 0x6751)},
403 {default_port_device(0x0af0, 0x6771)},
404 {default_port_device(0x0af0, 0x6791)},
405 {default_port_device(0x0af0, 0x6811)},
406 {default_port_device(0x0af0, 0x6911)},
407 {default_port_device(0x0af0, 0x6951)},
408 {default_port_device(0x0af0, 0x6971)},
409 {default_port_device(0x0af0, 0x7011)},
410 {default_port_device(0x0af0, 0x7031)},
411 {default_port_device(0x0af0, 0x7051)},
412 {default_port_device(0x0af0, 0x7071)},
413 {default_port_device(0x0af0, 0x7111)},
414 {default_port_device(0x0af0, 0x7211)},
415 {default_port_device(0x0af0, 0x7251)},
416 {default_port_device(0x0af0, 0x7271)},
417 {default_port_device(0x0af0, 0x7311)},
418 {default_port_device(0x0af0, 0xc031)}, /* Icon-Edge */
419 {icon321_port_device(0x0af0, 0xd013)}, /* Module HSxPA */
420 {icon321_port_device(0x0af0, 0xd031)}, /* Icon-321 */
421 {icon321_port_device(0x0af0, 0xd033)}, /* Icon-322 */
422 {USB_DEVICE(0x0af0, 0x7301)}, /* GE40x */
423 {USB_DEVICE(0x0af0, 0x7361)}, /* GE40x */
424 {USB_DEVICE(0x0af0, 0x7381)}, /* GE40x */
425 {USB_DEVICE(0x0af0, 0x7401)}, /* GI 0401 */
426 {USB_DEVICE(0x0af0, 0x7501)}, /* GTM 382 */
427 {USB_DEVICE(0x0af0, 0x7601)}, /* GE40x */
428 {USB_DEVICE(0x0af0, 0x7701)},
429 {USB_DEVICE(0x0af0, 0x7706)},
430 {USB_DEVICE(0x0af0, 0x7801)},
431 {USB_DEVICE(0x0af0, 0x7901)},
432 {USB_DEVICE(0x0af0, 0x7A01)},
433 {USB_DEVICE(0x0af0, 0x7A05)},
434 {USB_DEVICE(0x0af0, 0x8200)},
435 {USB_DEVICE(0x0af0, 0x8201)},
436 {USB_DEVICE(0x0af0, 0x8300)},
437 {USB_DEVICE(0x0af0, 0x8302)},
438 {USB_DEVICE(0x0af0, 0x8304)},
439 {USB_DEVICE(0x0af0, 0x8400)},
440 {USB_DEVICE(0x0af0, 0x8600)},
441 {USB_DEVICE(0x0af0, 0x8800)},
442 {USB_DEVICE(0x0af0, 0x8900)},
443 {USB_DEVICE(0x0af0, 0x9000)},
444 {USB_DEVICE(0x0af0, 0x9200)}, /* Option GTM671WFS */
445 {USB_DEVICE(0x0af0, 0xd035)},
446 {USB_DEVICE(0x0af0, 0xd055)},
447 {USB_DEVICE(0x0af0, 0xd155)},
448 {USB_DEVICE(0x0af0, 0xd255)},
449 {USB_DEVICE(0x0af0, 0xd057)},
450 {USB_DEVICE(0x0af0, 0xd157)},
451 {USB_DEVICE(0x0af0, 0xd257)},
452 {USB_DEVICE(0x0af0, 0xd357)},
453 {USB_DEVICE(0x0af0, 0xd058)},
454 {USB_DEVICE(0x0af0, 0xc100)},
455 {}
456 };
457 MODULE_DEVICE_TABLE(usb, hso_ids);
458
459 /* Sysfs attribute */
hsotype_show(struct device * dev,struct device_attribute * attr,char * buf)460 static ssize_t hsotype_show(struct device *dev,
461 struct device_attribute *attr, char *buf)
462 {
463 struct hso_device *hso_dev = dev_get_drvdata(dev);
464 char *port_name;
465
466 if (!hso_dev)
467 return 0;
468
469 switch (hso_dev->port_spec & HSO_PORT_MASK) {
470 case HSO_PORT_CONTROL:
471 port_name = "Control";
472 break;
473 case HSO_PORT_APP:
474 port_name = "Application";
475 break;
476 case HSO_PORT_APP2:
477 port_name = "Application2";
478 break;
479 case HSO_PORT_GPS:
480 port_name = "GPS";
481 break;
482 case HSO_PORT_GPS_CONTROL:
483 port_name = "GPS Control";
484 break;
485 case HSO_PORT_PCSC:
486 port_name = "PCSC";
487 break;
488 case HSO_PORT_DIAG:
489 port_name = "Diagnostic";
490 break;
491 case HSO_PORT_DIAG2:
492 port_name = "Diagnostic2";
493 break;
494 case HSO_PORT_MODEM:
495 port_name = "Modem";
496 break;
497 case HSO_PORT_NETWORK:
498 port_name = "Network";
499 break;
500 default:
501 port_name = "Unknown";
502 break;
503 }
504
505 return sprintf(buf, "%s\n", port_name);
506 }
507 static DEVICE_ATTR_RO(hsotype);
508
509 static struct attribute *hso_serial_dev_attrs[] = {
510 &dev_attr_hsotype.attr,
511 NULL
512 };
513
514 ATTRIBUTE_GROUPS(hso_serial_dev);
515
hso_urb_to_index(struct hso_serial * serial,struct urb * urb)516 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
517 {
518 int idx;
519
520 for (idx = 0; idx < serial->num_rx_urbs; idx++)
521 if (serial->rx_urb[idx] == urb)
522 return idx;
523 dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
524 return -1;
525 }
526
527 /* converts mux value to a port spec value */
hso_mux_to_port(int mux)528 static u32 hso_mux_to_port(int mux)
529 {
530 u32 result;
531
532 switch (mux) {
533 case 0x1:
534 result = HSO_PORT_CONTROL;
535 break;
536 case 0x2:
537 result = HSO_PORT_APP;
538 break;
539 case 0x4:
540 result = HSO_PORT_PCSC;
541 break;
542 case 0x8:
543 result = HSO_PORT_GPS;
544 break;
545 case 0x10:
546 result = HSO_PORT_APP2;
547 break;
548 default:
549 result = HSO_PORT_NO_PORT;
550 }
551 return result;
552 }
553
554 /* converts port spec value to a mux value */
hso_port_to_mux(int port)555 static u32 hso_port_to_mux(int port)
556 {
557 u32 result;
558
559 switch (port & HSO_PORT_MASK) {
560 case HSO_PORT_CONTROL:
561 result = 0x0;
562 break;
563 case HSO_PORT_APP:
564 result = 0x1;
565 break;
566 case HSO_PORT_PCSC:
567 result = 0x2;
568 break;
569 case HSO_PORT_GPS:
570 result = 0x3;
571 break;
572 case HSO_PORT_APP2:
573 result = 0x4;
574 break;
575 default:
576 result = 0x0;
577 }
578 return result;
579 }
580
get_serial_by_shared_int_and_type(struct hso_shared_int * shared_int,int mux)581 static struct hso_serial *get_serial_by_shared_int_and_type(
582 struct hso_shared_int *shared_int,
583 int mux)
584 {
585 int i, port;
586
587 port = hso_mux_to_port(mux);
588
589 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
590 if (serial_table[i] &&
591 (dev2ser(serial_table[i])->shared_int == shared_int) &&
592 ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
593 return dev2ser(serial_table[i]);
594 }
595 }
596
597 return NULL;
598 }
599
get_serial_by_index(unsigned index)600 static struct hso_serial *get_serial_by_index(unsigned index)
601 {
602 struct hso_serial *serial = NULL;
603 unsigned long flags;
604
605 spin_lock_irqsave(&serial_table_lock, flags);
606 if (serial_table[index])
607 serial = dev2ser(serial_table[index]);
608 spin_unlock_irqrestore(&serial_table_lock, flags);
609
610 return serial;
611 }
612
obtain_minor(struct hso_serial * serial)613 static int obtain_minor(struct hso_serial *serial)
614 {
615 int index;
616 unsigned long flags;
617
618 spin_lock_irqsave(&serial_table_lock, flags);
619 for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
620 if (serial_table[index] == NULL) {
621 serial_table[index] = serial->parent;
622 serial->minor = index;
623 spin_unlock_irqrestore(&serial_table_lock, flags);
624 return 0;
625 }
626 }
627 spin_unlock_irqrestore(&serial_table_lock, flags);
628
629 pr_err("%s: no free serial devices in table\n", __func__);
630 return -1;
631 }
632
release_minor(struct hso_serial * serial)633 static void release_minor(struct hso_serial *serial)
634 {
635 unsigned long flags;
636
637 spin_lock_irqsave(&serial_table_lock, flags);
638 serial_table[serial->minor] = NULL;
639 spin_unlock_irqrestore(&serial_table_lock, flags);
640 }
641
handle_usb_error(int status,const char * function,struct hso_device * hso_dev)642 static void handle_usb_error(int status, const char *function,
643 struct hso_device *hso_dev)
644 {
645 char *explanation;
646
647 switch (status) {
648 case -ENODEV:
649 explanation = "no device";
650 break;
651 case -ENOENT:
652 explanation = "endpoint not enabled";
653 break;
654 case -EPIPE:
655 explanation = "endpoint stalled";
656 break;
657 case -ENOSPC:
658 explanation = "not enough bandwidth";
659 break;
660 case -ESHUTDOWN:
661 explanation = "device disabled";
662 break;
663 case -EHOSTUNREACH:
664 explanation = "device suspended";
665 break;
666 case -EINVAL:
667 case -EAGAIN:
668 case -EFBIG:
669 case -EMSGSIZE:
670 explanation = "internal error";
671 break;
672 case -EILSEQ:
673 case -EPROTO:
674 case -ETIME:
675 case -ETIMEDOUT:
676 explanation = "protocol error";
677 if (hso_dev)
678 usb_queue_reset_device(hso_dev->interface);
679 break;
680 default:
681 explanation = "unknown status";
682 break;
683 }
684
685 /* log a meaningful explanation of an USB status */
686 hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
687 function, explanation, status);
688 }
689
690 /* Network interface functions */
691
692 /* called when net interface is brought up by ifconfig */
hso_net_open(struct net_device * net)693 static int hso_net_open(struct net_device *net)
694 {
695 struct hso_net *odev = netdev_priv(net);
696 unsigned long flags = 0;
697
698 if (!odev) {
699 dev_err(&net->dev, "No net device !\n");
700 return -ENODEV;
701 }
702
703 odev->skb_tx_buf = NULL;
704
705 /* setup environment */
706 spin_lock_irqsave(&odev->net_lock, flags);
707 odev->rx_parse_state = WAIT_IP;
708 odev->rx_buf_size = 0;
709 odev->rx_buf_missing = sizeof(struct iphdr);
710 spin_unlock_irqrestore(&odev->net_lock, flags);
711
712 /* We are up and running. */
713 set_bit(HSO_NET_RUNNING, &odev->flags);
714 hso_start_net_device(odev->parent);
715
716 /* Tell the kernel we are ready to start receiving from it */
717 netif_start_queue(net);
718
719 return 0;
720 }
721
722 /* called when interface is brought down by ifconfig */
hso_net_close(struct net_device * net)723 static int hso_net_close(struct net_device *net)
724 {
725 struct hso_net *odev = netdev_priv(net);
726
727 /* we don't need the queue anymore */
728 netif_stop_queue(net);
729 /* no longer running */
730 clear_bit(HSO_NET_RUNNING, &odev->flags);
731
732 hso_stop_net_device(odev->parent);
733
734 /* done */
735 return 0;
736 }
737
738 /* USB tells is xmit done, we should start the netqueue again */
write_bulk_callback(struct urb * urb)739 static void write_bulk_callback(struct urb *urb)
740 {
741 struct hso_net *odev = urb->context;
742 int status = urb->status;
743
744 /* Sanity check */
745 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
746 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
747 return;
748 }
749
750 /* Do we still have a valid kernel network device? */
751 if (!netif_device_present(odev->net)) {
752 dev_err(&urb->dev->dev, "%s: net device not present\n",
753 __func__);
754 return;
755 }
756
757 /* log status, but don't act on it, we don't need to resubmit anything
758 * anyhow */
759 if (status)
760 handle_usb_error(status, __func__, odev->parent);
761
762 hso_put_activity(odev->parent);
763
764 /* Tell the network interface we are ready for another frame */
765 netif_wake_queue(odev->net);
766 }
767
768 /* called by kernel when we need to transmit a packet */
hso_net_start_xmit(struct sk_buff * skb,struct net_device * net)769 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
770 struct net_device *net)
771 {
772 struct hso_net *odev = netdev_priv(net);
773 int result;
774
775 /* Tell the kernel, "No more frames 'til we are done with this one." */
776 netif_stop_queue(net);
777 if (hso_get_activity(odev->parent) == -EAGAIN) {
778 odev->skb_tx_buf = skb;
779 return NETDEV_TX_OK;
780 }
781
782 /* log if asked */
783 DUMP1(skb->data, skb->len);
784 /* Copy it from kernel memory to OUR memory */
785 memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
786 hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
787
788 /* Fill in the URB for shipping it out. */
789 usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
790 odev->parent->usb,
791 usb_sndbulkpipe(odev->parent->usb,
792 odev->out_endp->
793 bEndpointAddress & 0x7F),
794 odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
795 odev);
796
797 /* Deal with the Zero Length packet problem, I hope */
798 odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
799
800 /* Send the URB on its merry way. */
801 result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
802 if (result) {
803 dev_warn(&odev->parent->interface->dev,
804 "failed mux_bulk_tx_urb %d\n", result);
805 net->stats.tx_errors++;
806 netif_start_queue(net);
807 } else {
808 net->stats.tx_packets++;
809 net->stats.tx_bytes += skb->len;
810 }
811 dev_kfree_skb(skb);
812 /* we're done */
813 return NETDEV_TX_OK;
814 }
815
816 static const struct ethtool_ops ops = {
817 .get_link = ethtool_op_get_link
818 };
819
820 /* called when a packet did not ack after watchdogtimeout */
hso_net_tx_timeout(struct net_device * net,unsigned int txqueue)821 static void hso_net_tx_timeout(struct net_device *net, unsigned int txqueue)
822 {
823 struct hso_net *odev = netdev_priv(net);
824
825 if (!odev)
826 return;
827
828 /* Tell syslog we are hosed. */
829 dev_warn(&net->dev, "Tx timed out.\n");
830
831 /* Tear the waiting frame off the list */
832 if (odev->mux_bulk_tx_urb)
833 usb_unlink_urb(odev->mux_bulk_tx_urb);
834
835 /* Update statistics */
836 net->stats.tx_errors++;
837 }
838
839 /* make a real packet from the received USB buffer */
packetizeRx(struct hso_net * odev,unsigned char * ip_pkt,unsigned int count,unsigned char is_eop)840 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
841 unsigned int count, unsigned char is_eop)
842 {
843 unsigned short temp_bytes;
844 unsigned short buffer_offset = 0;
845 unsigned short frame_len;
846
847 /* log if needed */
848 hso_dbg(0x1, "Rx %d bytes\n", count);
849 DUMP(ip_pkt, min(128, (int)count));
850
851 while (count) {
852 switch (odev->rx_parse_state) {
853 case WAIT_IP:
854 /* waiting for IP header. */
855 /* wanted bytes - size of ip header */
856 temp_bytes =
857 (count <
858 odev->rx_buf_missing) ? count : odev->
859 rx_buf_missing;
860
861 memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
862 odev->rx_buf_size, ip_pkt + buffer_offset,
863 temp_bytes);
864
865 odev->rx_buf_size += temp_bytes;
866 buffer_offset += temp_bytes;
867 odev->rx_buf_missing -= temp_bytes;
868 count -= temp_bytes;
869
870 if (!odev->rx_buf_missing) {
871 /* header is complete allocate an sk_buffer and
872 * continue to WAIT_DATA */
873 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
874
875 if ((frame_len > DEFAULT_MRU) ||
876 (frame_len < sizeof(struct iphdr))) {
877 dev_err(&odev->net->dev,
878 "Invalid frame (%d) length\n",
879 frame_len);
880 odev->rx_parse_state = WAIT_SYNC;
881 continue;
882 }
883 /* Allocate an sk_buff */
884 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
885 frame_len);
886 if (!odev->skb_rx_buf) {
887 /* We got no receive buffer. */
888 hso_dbg(0x1, "could not allocate memory\n");
889 odev->rx_parse_state = WAIT_SYNC;
890 continue;
891 }
892
893 /* Copy what we got so far. make room for iphdr
894 * after tail. */
895 skb_put_data(odev->skb_rx_buf,
896 (char *)&(odev->rx_ip_hdr),
897 sizeof(struct iphdr));
898
899 /* ETH_HLEN */
900 odev->rx_buf_size = sizeof(struct iphdr);
901
902 /* Filip actually use .tot_len */
903 odev->rx_buf_missing =
904 frame_len - sizeof(struct iphdr);
905 odev->rx_parse_state = WAIT_DATA;
906 }
907 break;
908
909 case WAIT_DATA:
910 temp_bytes = (count < odev->rx_buf_missing)
911 ? count : odev->rx_buf_missing;
912
913 /* Copy the rest of the bytes that are left in the
914 * buffer into the waiting sk_buf. */
915 /* Make room for temp_bytes after tail. */
916 skb_put_data(odev->skb_rx_buf,
917 ip_pkt + buffer_offset,
918 temp_bytes);
919
920 odev->rx_buf_missing -= temp_bytes;
921 count -= temp_bytes;
922 buffer_offset += temp_bytes;
923 odev->rx_buf_size += temp_bytes;
924 if (!odev->rx_buf_missing) {
925 /* Packet is complete. Inject into stack. */
926 /* We have IP packet here */
927 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
928 skb_reset_mac_header(odev->skb_rx_buf);
929
930 /* Ship it off to the kernel */
931 netif_rx(odev->skb_rx_buf);
932 /* No longer our buffer. */
933 odev->skb_rx_buf = NULL;
934
935 /* update out statistics */
936 odev->net->stats.rx_packets++;
937
938 odev->net->stats.rx_bytes += odev->rx_buf_size;
939
940 odev->rx_buf_size = 0;
941 odev->rx_buf_missing = sizeof(struct iphdr);
942 odev->rx_parse_state = WAIT_IP;
943 }
944 break;
945
946 case WAIT_SYNC:
947 hso_dbg(0x1, " W_S\n");
948 count = 0;
949 break;
950 default:
951 hso_dbg(0x1, "\n");
952 count--;
953 break;
954 }
955 }
956
957 /* Recovery mechanism for WAIT_SYNC state. */
958 if (is_eop) {
959 if (odev->rx_parse_state == WAIT_SYNC) {
960 odev->rx_parse_state = WAIT_IP;
961 odev->rx_buf_size = 0;
962 odev->rx_buf_missing = sizeof(struct iphdr);
963 }
964 }
965 }
966
fix_crc_bug(struct urb * urb,__le16 max_packet_size)967 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
968 {
969 static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
970 u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
971
972 if (((rest == 5) || (rest == 6)) &&
973 !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
974 crc_check, 4)) {
975 urb->actual_length -= 4;
976 }
977 }
978
979 /* Moving data from usb to kernel (in interrupt state) */
read_bulk_callback(struct urb * urb)980 static void read_bulk_callback(struct urb *urb)
981 {
982 struct hso_net *odev = urb->context;
983 struct net_device *net;
984 int result;
985 unsigned long flags;
986 int status = urb->status;
987
988 /* is al ok? (Filip: Who's Al ?) */
989 if (status) {
990 handle_usb_error(status, __func__, odev->parent);
991 return;
992 }
993
994 /* Sanity check */
995 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
996 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
997 return;
998 }
999 usb_mark_last_busy(urb->dev);
1000
1001 net = odev->net;
1002
1003 if (!netif_device_present(net)) {
1004 /* Somebody killed our network interface... */
1005 return;
1006 }
1007
1008 if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1009 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1010
1011 /* do we even have a packet? */
1012 if (urb->actual_length) {
1013 /* Handle the IP stream, add header and push it onto network
1014 * stack if the packet is complete. */
1015 spin_lock_irqsave(&odev->net_lock, flags);
1016 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1017 (urb->transfer_buffer_length >
1018 urb->actual_length) ? 1 : 0);
1019 spin_unlock_irqrestore(&odev->net_lock, flags);
1020 }
1021
1022 /* We are done with this URB, resubmit it. Prep the USB to wait for
1023 * another frame. Reuse same as received. */
1024 usb_fill_bulk_urb(urb,
1025 odev->parent->usb,
1026 usb_rcvbulkpipe(odev->parent->usb,
1027 odev->in_endp->
1028 bEndpointAddress & 0x7F),
1029 urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1030 read_bulk_callback, odev);
1031
1032 /* Give this to the USB subsystem so it can tell us when more data
1033 * arrives. */
1034 result = usb_submit_urb(urb, GFP_ATOMIC);
1035 if (result)
1036 dev_warn(&odev->parent->interface->dev,
1037 "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1038 result);
1039 }
1040
1041 /* Serial driver functions */
1042
hso_init_termios(struct ktermios * termios)1043 static void hso_init_termios(struct ktermios *termios)
1044 {
1045 /*
1046 * The default requirements for this device are:
1047 */
1048 termios->c_iflag &=
1049 ~(IGNBRK /* disable ignore break */
1050 | BRKINT /* disable break causes interrupt */
1051 | PARMRK /* disable mark parity errors */
1052 | ISTRIP /* disable clear high bit of input characters */
1053 | INLCR /* disable translate NL to CR */
1054 | IGNCR /* disable ignore CR */
1055 | ICRNL /* disable translate CR to NL */
1056 | IXON); /* disable enable XON/XOFF flow control */
1057
1058 /* disable postprocess output characters */
1059 termios->c_oflag &= ~OPOST;
1060
1061 termios->c_lflag &=
1062 ~(ECHO /* disable echo input characters */
1063 | ECHONL /* disable echo new line */
1064 | ICANON /* disable erase, kill, werase, and rprnt
1065 special characters */
1066 | ISIG /* disable interrupt, quit, and suspend special
1067 characters */
1068 | IEXTEN); /* disable non-POSIX special characters */
1069
1070 termios->c_cflag &=
1071 ~(CSIZE /* no size */
1072 | PARENB /* disable parity bit */
1073 | CBAUD /* clear current baud rate */
1074 | CBAUDEX); /* clear current buad rate */
1075
1076 termios->c_cflag |= CS8; /* character size 8 bits */
1077
1078 /* baud rate 115200 */
1079 tty_termios_encode_baud_rate(termios, 115200, 115200);
1080 }
1081
_hso_serial_set_termios(struct tty_struct * tty)1082 static void _hso_serial_set_termios(struct tty_struct *tty)
1083 {
1084 struct hso_serial *serial = tty->driver_data;
1085
1086 if (!serial) {
1087 pr_err("%s: no tty structures", __func__);
1088 return;
1089 }
1090
1091 hso_dbg(0x8, "port %d\n", serial->minor);
1092
1093 /*
1094 * Fix up unsupported bits
1095 */
1096 tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1097
1098 tty->termios.c_cflag &=
1099 ~(CSIZE /* no size */
1100 | PARENB /* disable parity bit */
1101 | CBAUD /* clear current baud rate */
1102 | CBAUDEX); /* clear current buad rate */
1103
1104 tty->termios.c_cflag |= CS8; /* character size 8 bits */
1105
1106 /* baud rate 115200 */
1107 tty_encode_baud_rate(tty, 115200, 115200);
1108 }
1109
hso_resubmit_rx_bulk_urb(struct hso_serial * serial,struct urb * urb)1110 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1111 {
1112 int result;
1113 /* We are done with this URB, resubmit it. Prep the USB to wait for
1114 * another frame */
1115 usb_fill_bulk_urb(urb, serial->parent->usb,
1116 usb_rcvbulkpipe(serial->parent->usb,
1117 serial->in_endp->
1118 bEndpointAddress & 0x7F),
1119 urb->transfer_buffer, serial->rx_data_length,
1120 hso_std_serial_read_bulk_callback, serial);
1121 /* Give this to the USB subsystem so it can tell us when more data
1122 * arrives. */
1123 result = usb_submit_urb(urb, GFP_ATOMIC);
1124 if (result) {
1125 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1126 __func__, result);
1127 }
1128 }
1129
1130
1131
1132
put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial * serial)1133 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1134 {
1135 int count;
1136 struct urb *curr_urb;
1137
1138 while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1139 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1140 count = put_rxbuf_data(curr_urb, serial);
1141 if (count == -1)
1142 return;
1143 if (count == 0) {
1144 serial->curr_rx_urb_idx++;
1145 if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1146 serial->curr_rx_urb_idx = 0;
1147 hso_resubmit_rx_bulk_urb(serial, curr_urb);
1148 }
1149 }
1150 }
1151
put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial * serial)1152 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1153 {
1154 int count = 0;
1155 struct urb *urb;
1156
1157 urb = serial->rx_urb[0];
1158 if (serial->port.count > 0) {
1159 count = put_rxbuf_data(urb, serial);
1160 if (count == -1)
1161 return;
1162 }
1163 /* Re issue a read as long as we receive data. */
1164
1165 if (count == 0 && ((urb->actual_length != 0) ||
1166 (serial->rx_state == RX_PENDING))) {
1167 serial->rx_state = RX_SENT;
1168 hso_mux_serial_read(serial);
1169 } else
1170 serial->rx_state = RX_IDLE;
1171 }
1172
1173
1174 /* read callback for Diag and CS port */
hso_std_serial_read_bulk_callback(struct urb * urb)1175 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1176 {
1177 struct hso_serial *serial = urb->context;
1178 int status = urb->status;
1179 unsigned long flags;
1180
1181 hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1182
1183 /* sanity check */
1184 if (!serial) {
1185 hso_dbg(0x1, "serial == NULL\n");
1186 return;
1187 }
1188 if (status) {
1189 handle_usb_error(status, __func__, serial->parent);
1190 return;
1191 }
1192
1193 hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1194 DUMP1(urb->transfer_buffer, urb->actual_length);
1195
1196 /* Anyone listening? */
1197 if (serial->port.count == 0)
1198 return;
1199
1200 if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1201 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1202 /* Valid data, handle RX data */
1203 spin_lock_irqsave(&serial->serial_lock, flags);
1204 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1205 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1206 spin_unlock_irqrestore(&serial->serial_lock, flags);
1207 }
1208
1209 /*
1210 * This needs to be a tasklet otherwise we will
1211 * end up recursively calling this function.
1212 */
hso_unthrottle_tasklet(struct tasklet_struct * t)1213 static void hso_unthrottle_tasklet(struct tasklet_struct *t)
1214 {
1215 struct hso_serial *serial = from_tasklet(serial, t,
1216 unthrottle_tasklet);
1217 unsigned long flags;
1218
1219 spin_lock_irqsave(&serial->serial_lock, flags);
1220 if ((serial->parent->port_spec & HSO_INTF_MUX))
1221 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1222 else
1223 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1224 spin_unlock_irqrestore(&serial->serial_lock, flags);
1225 }
1226
hso_unthrottle(struct tty_struct * tty)1227 static void hso_unthrottle(struct tty_struct *tty)
1228 {
1229 struct hso_serial *serial = tty->driver_data;
1230
1231 tasklet_hi_schedule(&serial->unthrottle_tasklet);
1232 }
1233
1234 /* open the requested serial port */
hso_serial_open(struct tty_struct * tty,struct file * filp)1235 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1236 {
1237 struct hso_serial *serial = get_serial_by_index(tty->index);
1238 int result;
1239
1240 /* sanity check */
1241 if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1242 WARN_ON(1);
1243 tty->driver_data = NULL;
1244 hso_dbg(0x1, "Failed to open port\n");
1245 return -ENODEV;
1246 }
1247
1248 mutex_lock(&serial->parent->mutex);
1249 result = usb_autopm_get_interface(serial->parent->interface);
1250 if (result < 0)
1251 goto err_out;
1252
1253 hso_dbg(0x1, "Opening %d\n", serial->minor);
1254
1255 /* setup */
1256 tty->driver_data = serial;
1257 tty_port_tty_set(&serial->port, tty);
1258
1259 /* check for port already opened, if not set the termios */
1260 serial->port.count++;
1261 if (serial->port.count == 1) {
1262 serial->rx_state = RX_IDLE;
1263 /* Force default termio settings */
1264 _hso_serial_set_termios(tty);
1265 tasklet_setup(&serial->unthrottle_tasklet,
1266 hso_unthrottle_tasklet);
1267 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1268 if (result) {
1269 hso_stop_serial_device(serial->parent);
1270 serial->port.count--;
1271 } else {
1272 kref_get(&serial->parent->ref);
1273 }
1274 } else {
1275 hso_dbg(0x1, "Port was already open\n");
1276 }
1277
1278 usb_autopm_put_interface(serial->parent->interface);
1279
1280 /* done */
1281 if (result)
1282 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1283 err_out:
1284 mutex_unlock(&serial->parent->mutex);
1285 return result;
1286 }
1287
1288 /* close the requested serial port */
hso_serial_close(struct tty_struct * tty,struct file * filp)1289 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1290 {
1291 struct hso_serial *serial = tty->driver_data;
1292 u8 usb_gone;
1293
1294 hso_dbg(0x1, "Closing serial port\n");
1295
1296 /* Open failed, no close cleanup required */
1297 if (serial == NULL)
1298 return;
1299
1300 mutex_lock(&serial->parent->mutex);
1301 usb_gone = serial->parent->usb_gone;
1302
1303 if (!usb_gone)
1304 usb_autopm_get_interface(serial->parent->interface);
1305
1306 /* reset the rts and dtr */
1307 /* do the actual close */
1308 serial->port.count--;
1309
1310 if (serial->port.count <= 0) {
1311 serial->port.count = 0;
1312 tty_port_tty_set(&serial->port, NULL);
1313 if (!usb_gone)
1314 hso_stop_serial_device(serial->parent);
1315 tasklet_kill(&serial->unthrottle_tasklet);
1316 }
1317
1318 if (!usb_gone)
1319 usb_autopm_put_interface(serial->parent->interface);
1320
1321 mutex_unlock(&serial->parent->mutex);
1322 }
1323
1324 /* close the requested serial port */
hso_serial_write(struct tty_struct * tty,const unsigned char * buf,int count)1325 static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
1326 int count)
1327 {
1328 struct hso_serial *serial = tty->driver_data;
1329 int space, tx_bytes;
1330 unsigned long flags;
1331
1332 /* sanity check */
1333 if (serial == NULL) {
1334 pr_err("%s: serial is NULL\n", __func__);
1335 return -ENODEV;
1336 }
1337
1338 spin_lock_irqsave(&serial->serial_lock, flags);
1339
1340 space = serial->tx_data_length - serial->tx_buffer_count;
1341 tx_bytes = (count < space) ? count : space;
1342
1343 if (!tx_bytes)
1344 goto out;
1345
1346 memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
1347 serial->tx_buffer_count += tx_bytes;
1348
1349 out:
1350 spin_unlock_irqrestore(&serial->serial_lock, flags);
1351
1352 hso_kick_transmit(serial);
1353 /* done */
1354 return tx_bytes;
1355 }
1356
1357 /* how much room is there for writing */
hso_serial_write_room(struct tty_struct * tty)1358 static unsigned int hso_serial_write_room(struct tty_struct *tty)
1359 {
1360 struct hso_serial *serial = tty->driver_data;
1361 unsigned int room;
1362 unsigned long flags;
1363
1364 spin_lock_irqsave(&serial->serial_lock, flags);
1365 room = serial->tx_data_length - serial->tx_buffer_count;
1366 spin_unlock_irqrestore(&serial->serial_lock, flags);
1367
1368 /* return free room */
1369 return room;
1370 }
1371
hso_serial_cleanup(struct tty_struct * tty)1372 static void hso_serial_cleanup(struct tty_struct *tty)
1373 {
1374 struct hso_serial *serial = tty->driver_data;
1375
1376 if (!serial)
1377 return;
1378
1379 kref_put(&serial->parent->ref, hso_serial_ref_free);
1380 }
1381
1382 /* setup the term */
hso_serial_set_termios(struct tty_struct * tty,const struct ktermios * old)1383 static void hso_serial_set_termios(struct tty_struct *tty,
1384 const struct ktermios *old)
1385 {
1386 struct hso_serial *serial = tty->driver_data;
1387 unsigned long flags;
1388
1389 if (old)
1390 hso_dbg(0x16, "Termios called with: cflags new[%u] - old[%u]\n",
1391 (unsigned int)tty->termios.c_cflag,
1392 (unsigned int)old->c_cflag);
1393
1394 /* the actual setup */
1395 spin_lock_irqsave(&serial->serial_lock, flags);
1396 if (serial->port.count)
1397 _hso_serial_set_termios(tty);
1398 else
1399 tty->termios = *old;
1400 spin_unlock_irqrestore(&serial->serial_lock, flags);
1401
1402 /* done */
1403 }
1404
1405 /* how many characters in the buffer */
hso_serial_chars_in_buffer(struct tty_struct * tty)1406 static unsigned int hso_serial_chars_in_buffer(struct tty_struct *tty)
1407 {
1408 struct hso_serial *serial = tty->driver_data;
1409 unsigned long flags;
1410 unsigned int chars;
1411
1412 /* sanity check */
1413 if (serial == NULL)
1414 return 0;
1415
1416 spin_lock_irqsave(&serial->serial_lock, flags);
1417 chars = serial->tx_buffer_count;
1418 spin_unlock_irqrestore(&serial->serial_lock, flags);
1419
1420 return chars;
1421 }
tiocmget_submit_urb(struct hso_serial * serial,struct hso_tiocmget * tiocmget,struct usb_device * usb)1422 static int tiocmget_submit_urb(struct hso_serial *serial,
1423 struct hso_tiocmget *tiocmget,
1424 struct usb_device *usb)
1425 {
1426 int result;
1427
1428 if (serial->parent->usb_gone)
1429 return -ENODEV;
1430 usb_fill_int_urb(tiocmget->urb, usb,
1431 usb_rcvintpipe(usb,
1432 tiocmget->endp->
1433 bEndpointAddress & 0x7F),
1434 tiocmget->serial_state_notification,
1435 sizeof(struct hso_serial_state_notification),
1436 tiocmget_intr_callback, serial,
1437 tiocmget->endp->bInterval);
1438 result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1439 if (result) {
1440 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1441 result);
1442 }
1443 return result;
1444
1445 }
1446
tiocmget_intr_callback(struct urb * urb)1447 static void tiocmget_intr_callback(struct urb *urb)
1448 {
1449 struct hso_serial *serial = urb->context;
1450 struct hso_tiocmget *tiocmget;
1451 int status = urb->status;
1452 u16 UART_state_bitmap, prev_UART_state_bitmap;
1453 struct uart_icount *icount;
1454 struct hso_serial_state_notification *serial_state_notification;
1455 struct usb_device *usb;
1456 struct usb_interface *interface;
1457 int if_num;
1458
1459 /* Sanity checks */
1460 if (!serial)
1461 return;
1462 if (status) {
1463 handle_usb_error(status, __func__, serial->parent);
1464 return;
1465 }
1466
1467 /* tiocmget is only supported on HSO_PORT_MODEM */
1468 tiocmget = serial->tiocmget;
1469 if (!tiocmget)
1470 return;
1471 BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1472
1473 usb = serial->parent->usb;
1474 interface = serial->parent->interface;
1475
1476 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1477
1478 /* wIndex should be the USB interface number of the port to which the
1479 * notification applies, which should always be the Modem port.
1480 */
1481 serial_state_notification = tiocmget->serial_state_notification;
1482 if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1483 serial_state_notification->bNotification != B_NOTIFICATION ||
1484 le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1485 le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1486 le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1487 dev_warn(&usb->dev,
1488 "hso received invalid serial state notification\n");
1489 DUMP(serial_state_notification,
1490 sizeof(struct hso_serial_state_notification));
1491 } else {
1492 unsigned long flags;
1493
1494 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1495 UART_state_bitmap);
1496 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1497 icount = &tiocmget->icount;
1498 spin_lock_irqsave(&serial->serial_lock, flags);
1499 if ((UART_state_bitmap & B_OVERRUN) !=
1500 (prev_UART_state_bitmap & B_OVERRUN))
1501 icount->parity++;
1502 if ((UART_state_bitmap & B_PARITY) !=
1503 (prev_UART_state_bitmap & B_PARITY))
1504 icount->parity++;
1505 if ((UART_state_bitmap & B_FRAMING) !=
1506 (prev_UART_state_bitmap & B_FRAMING))
1507 icount->frame++;
1508 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1509 !(prev_UART_state_bitmap & B_RING_SIGNAL))
1510 icount->rng++;
1511 if ((UART_state_bitmap & B_BREAK) !=
1512 (prev_UART_state_bitmap & B_BREAK))
1513 icount->brk++;
1514 if ((UART_state_bitmap & B_TX_CARRIER) !=
1515 (prev_UART_state_bitmap & B_TX_CARRIER))
1516 icount->dsr++;
1517 if ((UART_state_bitmap & B_RX_CARRIER) !=
1518 (prev_UART_state_bitmap & B_RX_CARRIER))
1519 icount->dcd++;
1520 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1521 spin_unlock_irqrestore(&serial->serial_lock, flags);
1522 tiocmget->intr_completed = 1;
1523 wake_up_interruptible(&tiocmget->waitq);
1524 }
1525 memset(serial_state_notification, 0,
1526 sizeof(struct hso_serial_state_notification));
1527 tiocmget_submit_urb(serial,
1528 tiocmget,
1529 serial->parent->usb);
1530 }
1531
1532 /*
1533 * next few functions largely stolen from drivers/serial/serial_core.c
1534 */
1535 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1536 * - mask passed in arg for lines of interest
1537 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1538 * Caller should use TIOCGICOUNT to see which one it was
1539 */
1540 static int
hso_wait_modem_status(struct hso_serial * serial,unsigned long arg)1541 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1542 {
1543 DECLARE_WAITQUEUE(wait, current);
1544 struct uart_icount cprev, cnow;
1545 struct hso_tiocmget *tiocmget;
1546 int ret;
1547
1548 tiocmget = serial->tiocmget;
1549 if (!tiocmget)
1550 return -ENOENT;
1551 /*
1552 * note the counters on entry
1553 */
1554 spin_lock_irq(&serial->serial_lock);
1555 memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1556 spin_unlock_irq(&serial->serial_lock);
1557 add_wait_queue(&tiocmget->waitq, &wait);
1558 for (;;) {
1559 spin_lock_irq(&serial->serial_lock);
1560 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1561 spin_unlock_irq(&serial->serial_lock);
1562 set_current_state(TASK_INTERRUPTIBLE);
1563 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1564 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1565 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd))) {
1566 ret = 0;
1567 break;
1568 }
1569 schedule();
1570 /* see if a signal did it */
1571 if (signal_pending(current)) {
1572 ret = -ERESTARTSYS;
1573 break;
1574 }
1575 cprev = cnow;
1576 }
1577 __set_current_state(TASK_RUNNING);
1578 remove_wait_queue(&tiocmget->waitq, &wait);
1579
1580 return ret;
1581 }
1582
1583 /*
1584 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1585 * Return: write counters to the user passed counter struct
1586 * NB: both 1->0 and 0->1 transitions are counted except for
1587 * RI where only 0->1 is counted.
1588 */
hso_get_count(struct tty_struct * tty,struct serial_icounter_struct * icount)1589 static int hso_get_count(struct tty_struct *tty,
1590 struct serial_icounter_struct *icount)
1591 {
1592 struct uart_icount cnow;
1593 struct hso_serial *serial = tty->driver_data;
1594 struct hso_tiocmget *tiocmget = serial->tiocmget;
1595
1596 memset(icount, 0, sizeof(struct serial_icounter_struct));
1597
1598 if (!tiocmget)
1599 return -ENOENT;
1600 spin_lock_irq(&serial->serial_lock);
1601 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1602 spin_unlock_irq(&serial->serial_lock);
1603
1604 icount->cts = cnow.cts;
1605 icount->dsr = cnow.dsr;
1606 icount->rng = cnow.rng;
1607 icount->dcd = cnow.dcd;
1608 icount->rx = cnow.rx;
1609 icount->tx = cnow.tx;
1610 icount->frame = cnow.frame;
1611 icount->overrun = cnow.overrun;
1612 icount->parity = cnow.parity;
1613 icount->brk = cnow.brk;
1614 icount->buf_overrun = cnow.buf_overrun;
1615
1616 return 0;
1617 }
1618
1619
hso_serial_tiocmget(struct tty_struct * tty)1620 static int hso_serial_tiocmget(struct tty_struct *tty)
1621 {
1622 int retval;
1623 struct hso_serial *serial = tty->driver_data;
1624 struct hso_tiocmget *tiocmget;
1625 u16 UART_state_bitmap;
1626
1627 /* sanity check */
1628 if (!serial) {
1629 hso_dbg(0x1, "no tty structures\n");
1630 return -EINVAL;
1631 }
1632 spin_lock_irq(&serial->serial_lock);
1633 retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1634 ((serial->dtr_state) ? TIOCM_DTR : 0);
1635 tiocmget = serial->tiocmget;
1636 if (tiocmget) {
1637
1638 UART_state_bitmap = le16_to_cpu(
1639 tiocmget->prev_UART_state_bitmap);
1640 if (UART_state_bitmap & B_RING_SIGNAL)
1641 retval |= TIOCM_RNG;
1642 if (UART_state_bitmap & B_RX_CARRIER)
1643 retval |= TIOCM_CD;
1644 if (UART_state_bitmap & B_TX_CARRIER)
1645 retval |= TIOCM_DSR;
1646 }
1647 spin_unlock_irq(&serial->serial_lock);
1648 return retval;
1649 }
1650
hso_serial_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1651 static int hso_serial_tiocmset(struct tty_struct *tty,
1652 unsigned int set, unsigned int clear)
1653 {
1654 int val = 0;
1655 unsigned long flags;
1656 int if_num;
1657 struct hso_serial *serial = tty->driver_data;
1658 struct usb_interface *interface;
1659
1660 /* sanity check */
1661 if (!serial) {
1662 hso_dbg(0x1, "no tty structures\n");
1663 return -EINVAL;
1664 }
1665
1666 if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1667 return -EINVAL;
1668
1669 interface = serial->parent->interface;
1670 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1671
1672 spin_lock_irqsave(&serial->serial_lock, flags);
1673 if (set & TIOCM_RTS)
1674 serial->rts_state = 1;
1675 if (set & TIOCM_DTR)
1676 serial->dtr_state = 1;
1677
1678 if (clear & TIOCM_RTS)
1679 serial->rts_state = 0;
1680 if (clear & TIOCM_DTR)
1681 serial->dtr_state = 0;
1682
1683 if (serial->dtr_state)
1684 val |= 0x01;
1685 if (serial->rts_state)
1686 val |= 0x02;
1687
1688 spin_unlock_irqrestore(&serial->serial_lock, flags);
1689
1690 return usb_control_msg(serial->parent->usb,
1691 usb_sndctrlpipe(serial->parent->usb, 0), 0x22,
1692 0x21, val, if_num, NULL, 0,
1693 USB_CTRL_SET_TIMEOUT);
1694 }
1695
hso_serial_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1696 static int hso_serial_ioctl(struct tty_struct *tty,
1697 unsigned int cmd, unsigned long arg)
1698 {
1699 struct hso_serial *serial = tty->driver_data;
1700 int ret = 0;
1701 hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1702
1703 if (!serial)
1704 return -ENODEV;
1705 switch (cmd) {
1706 case TIOCMIWAIT:
1707 ret = hso_wait_modem_status(serial, arg);
1708 break;
1709 default:
1710 ret = -ENOIOCTLCMD;
1711 break;
1712 }
1713 return ret;
1714 }
1715
1716
1717 /* starts a transmit */
hso_kick_transmit(struct hso_serial * serial)1718 static void hso_kick_transmit(struct hso_serial *serial)
1719 {
1720 unsigned long flags;
1721 int res;
1722
1723 spin_lock_irqsave(&serial->serial_lock, flags);
1724 if (!serial->tx_buffer_count)
1725 goto out;
1726
1727 if (serial->tx_urb_used)
1728 goto out;
1729
1730 /* Wakeup USB interface if necessary */
1731 if (hso_get_activity(serial->parent) == -EAGAIN)
1732 goto out;
1733
1734 /* Switch pointers around to avoid memcpy */
1735 swap(serial->tx_buffer, serial->tx_data);
1736 serial->tx_data_count = serial->tx_buffer_count;
1737 serial->tx_buffer_count = 0;
1738
1739 /* If serial->tx_data is set, it means we switched buffers */
1740 if (serial->tx_data && serial->write_data) {
1741 res = serial->write_data(serial);
1742 if (res >= 0)
1743 serial->tx_urb_used = 1;
1744 }
1745 out:
1746 spin_unlock_irqrestore(&serial->serial_lock, flags);
1747 }
1748
1749 /* make a request (for reading and writing data to muxed serial port) */
mux_device_request(struct hso_serial * serial,u8 type,u16 port,struct urb * ctrl_urb,struct usb_ctrlrequest * ctrl_req,u8 * ctrl_urb_data,u32 size)1750 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1751 struct urb *ctrl_urb,
1752 struct usb_ctrlrequest *ctrl_req,
1753 u8 *ctrl_urb_data, u32 size)
1754 {
1755 int result;
1756 int pipe;
1757
1758 /* Sanity check */
1759 if (!serial || !ctrl_urb || !ctrl_req) {
1760 pr_err("%s: Wrong arguments\n", __func__);
1761 return -EINVAL;
1762 }
1763
1764 /* initialize */
1765 ctrl_req->wValue = 0;
1766 ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1767 ctrl_req->wLength = cpu_to_le16(size);
1768
1769 if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1770 /* Reading command */
1771 ctrl_req->bRequestType = USB_DIR_IN |
1772 USB_TYPE_OPTION_VENDOR |
1773 USB_RECIP_INTERFACE;
1774 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1775 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1776 } else {
1777 /* Writing command */
1778 ctrl_req->bRequestType = USB_DIR_OUT |
1779 USB_TYPE_OPTION_VENDOR |
1780 USB_RECIP_INTERFACE;
1781 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1782 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1783 }
1784 /* syslog */
1785 hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1786 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1787 ctrl_req->bRequestType, ctrl_req->wLength, port);
1788
1789 /* Load ctrl urb */
1790 ctrl_urb->transfer_flags = 0;
1791 usb_fill_control_urb(ctrl_urb,
1792 serial->parent->usb,
1793 pipe,
1794 (u8 *) ctrl_req,
1795 ctrl_urb_data, size, ctrl_callback, serial);
1796 /* Send it on merry way */
1797 result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1798 if (result) {
1799 dev_err(&ctrl_urb->dev->dev,
1800 "%s failed submit ctrl_urb %d type %d\n", __func__,
1801 result, type);
1802 return result;
1803 }
1804
1805 /* done */
1806 return size;
1807 }
1808
1809 /* called by intr_callback when read occurs */
hso_mux_serial_read(struct hso_serial * serial)1810 static int hso_mux_serial_read(struct hso_serial *serial)
1811 {
1812 if (!serial)
1813 return -EINVAL;
1814
1815 /* clean data */
1816 memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1817 /* make the request */
1818
1819 if (serial->num_rx_urbs != 1) {
1820 dev_err(&serial->parent->interface->dev,
1821 "ERROR: mux'd reads with multiple buffers "
1822 "not possible\n");
1823 return 0;
1824 }
1825 return mux_device_request(serial,
1826 USB_CDC_GET_ENCAPSULATED_RESPONSE,
1827 serial->parent->port_spec & HSO_PORT_MASK,
1828 serial->rx_urb[0],
1829 &serial->ctrl_req_rx,
1830 serial->rx_data[0], serial->rx_data_length);
1831 }
1832
1833 /* used for muxed serial port callback (muxed serial read) */
intr_callback(struct urb * urb)1834 static void intr_callback(struct urb *urb)
1835 {
1836 struct hso_shared_int *shared_int = urb->context;
1837 struct hso_serial *serial;
1838 unsigned char *port_req;
1839 int status = urb->status;
1840 unsigned long flags;
1841 int i;
1842
1843 usb_mark_last_busy(urb->dev);
1844
1845 /* sanity check */
1846 if (!shared_int)
1847 return;
1848
1849 /* status check */
1850 if (status) {
1851 handle_usb_error(status, __func__, NULL);
1852 return;
1853 }
1854 hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1855
1856 /* what request? */
1857 port_req = urb->transfer_buffer;
1858 hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1859 /* loop over all muxed ports to find the one sending this */
1860 for (i = 0; i < 8; i++) {
1861 /* max 8 channels on MUX */
1862 if (*port_req & (1 << i)) {
1863 serial = get_serial_by_shared_int_and_type(shared_int,
1864 (1 << i));
1865 if (serial != NULL) {
1866 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1867 i);
1868 spin_lock_irqsave(&serial->serial_lock, flags);
1869 if (serial->rx_state == RX_IDLE &&
1870 serial->port.count > 0) {
1871 /* Setup and send a ctrl req read on
1872 * port i */
1873 if (!serial->rx_urb_filled[0]) {
1874 serial->rx_state = RX_SENT;
1875 hso_mux_serial_read(serial);
1876 } else
1877 serial->rx_state = RX_PENDING;
1878 } else {
1879 hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1880 i);
1881 }
1882 spin_unlock_irqrestore(&serial->serial_lock,
1883 flags);
1884 }
1885 }
1886 }
1887 /* Resubmit interrupt urb */
1888 hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1889 }
1890
1891 /* called for writing to muxed serial port */
hso_mux_serial_write_data(struct hso_serial * serial)1892 static int hso_mux_serial_write_data(struct hso_serial *serial)
1893 {
1894 if (NULL == serial)
1895 return -EINVAL;
1896
1897 return mux_device_request(serial,
1898 USB_CDC_SEND_ENCAPSULATED_COMMAND,
1899 serial->parent->port_spec & HSO_PORT_MASK,
1900 serial->tx_urb,
1901 &serial->ctrl_req_tx,
1902 serial->tx_data, serial->tx_data_count);
1903 }
1904
1905 /* write callback for Diag and CS port */
hso_std_serial_write_bulk_callback(struct urb * urb)1906 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1907 {
1908 struct hso_serial *serial = urb->context;
1909 int status = urb->status;
1910 unsigned long flags;
1911
1912 /* sanity check */
1913 if (!serial) {
1914 hso_dbg(0x1, "serial == NULL\n");
1915 return;
1916 }
1917
1918 spin_lock_irqsave(&serial->serial_lock, flags);
1919 serial->tx_urb_used = 0;
1920 spin_unlock_irqrestore(&serial->serial_lock, flags);
1921 if (status) {
1922 handle_usb_error(status, __func__, serial->parent);
1923 return;
1924 }
1925 hso_put_activity(serial->parent);
1926 tty_port_tty_wakeup(&serial->port);
1927 hso_kick_transmit(serial);
1928
1929 hso_dbg(0x1, "\n");
1930 }
1931
1932 /* called for writing diag or CS serial port */
hso_std_serial_write_data(struct hso_serial * serial)1933 static int hso_std_serial_write_data(struct hso_serial *serial)
1934 {
1935 int count = serial->tx_data_count;
1936 int result;
1937
1938 usb_fill_bulk_urb(serial->tx_urb,
1939 serial->parent->usb,
1940 usb_sndbulkpipe(serial->parent->usb,
1941 serial->out_endp->
1942 bEndpointAddress & 0x7F),
1943 serial->tx_data, serial->tx_data_count,
1944 hso_std_serial_write_bulk_callback, serial);
1945
1946 result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1947 if (result) {
1948 dev_warn(&serial->parent->usb->dev,
1949 "Failed to submit urb - res %d\n", result);
1950 return result;
1951 }
1952
1953 return count;
1954 }
1955
1956 /* callback after read or write on muxed serial port */
ctrl_callback(struct urb * urb)1957 static void ctrl_callback(struct urb *urb)
1958 {
1959 struct hso_serial *serial = urb->context;
1960 struct usb_ctrlrequest *req;
1961 int status = urb->status;
1962 unsigned long flags;
1963
1964 /* sanity check */
1965 if (!serial)
1966 return;
1967
1968 spin_lock_irqsave(&serial->serial_lock, flags);
1969 serial->tx_urb_used = 0;
1970 spin_unlock_irqrestore(&serial->serial_lock, flags);
1971 if (status) {
1972 handle_usb_error(status, __func__, serial->parent);
1973 return;
1974 }
1975
1976 /* what request? */
1977 req = (struct usb_ctrlrequest *)(urb->setup_packet);
1978 hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1979 hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1980 DUMP1(urb->transfer_buffer, urb->actual_length);
1981
1982 if (req->bRequestType ==
1983 (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1984 /* response to a read command */
1985 serial->rx_urb_filled[0] = 1;
1986 spin_lock_irqsave(&serial->serial_lock, flags);
1987 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1988 spin_unlock_irqrestore(&serial->serial_lock, flags);
1989 } else {
1990 hso_put_activity(serial->parent);
1991 tty_port_tty_wakeup(&serial->port);
1992 /* response to a write command */
1993 hso_kick_transmit(serial);
1994 }
1995 }
1996
1997 /* handle RX data for serial port */
put_rxbuf_data(struct urb * urb,struct hso_serial * serial)1998 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
1999 {
2000 struct tty_struct *tty;
2001 int count;
2002
2003 /* Sanity check */
2004 if (urb == NULL || serial == NULL) {
2005 hso_dbg(0x1, "serial = NULL\n");
2006 return -2;
2007 }
2008
2009 tty = tty_port_tty_get(&serial->port);
2010
2011 if (tty && tty_throttled(tty)) {
2012 tty_kref_put(tty);
2013 return -1;
2014 }
2015
2016 /* Push data to tty */
2017 hso_dbg(0x1, "data to push to tty\n");
2018 count = tty_buffer_request_room(&serial->port, urb->actual_length);
2019 if (count >= urb->actual_length) {
2020 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2021 urb->actual_length);
2022 tty_flip_buffer_push(&serial->port);
2023 } else {
2024 dev_warn(&serial->parent->usb->dev,
2025 "dropping data, %d bytes lost\n", urb->actual_length);
2026 }
2027
2028 tty_kref_put(tty);
2029
2030 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2031
2032 return 0;
2033 }
2034
2035
2036 /* Base driver functions */
2037
hso_log_port(struct hso_device * hso_dev)2038 static void hso_log_port(struct hso_device *hso_dev)
2039 {
2040 char *port_type;
2041 char port_dev[20];
2042
2043 switch (hso_dev->port_spec & HSO_PORT_MASK) {
2044 case HSO_PORT_CONTROL:
2045 port_type = "Control";
2046 break;
2047 case HSO_PORT_APP:
2048 port_type = "Application";
2049 break;
2050 case HSO_PORT_GPS:
2051 port_type = "GPS";
2052 break;
2053 case HSO_PORT_GPS_CONTROL:
2054 port_type = "GPS control";
2055 break;
2056 case HSO_PORT_APP2:
2057 port_type = "Application2";
2058 break;
2059 case HSO_PORT_PCSC:
2060 port_type = "PCSC";
2061 break;
2062 case HSO_PORT_DIAG:
2063 port_type = "Diagnostic";
2064 break;
2065 case HSO_PORT_DIAG2:
2066 port_type = "Diagnostic2";
2067 break;
2068 case HSO_PORT_MODEM:
2069 port_type = "Modem";
2070 break;
2071 case HSO_PORT_NETWORK:
2072 port_type = "Network";
2073 break;
2074 default:
2075 port_type = "Unknown";
2076 break;
2077 }
2078 if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2079 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2080 } else
2081 sprintf(port_dev, "/dev/%s%d", tty_filename,
2082 dev2ser(hso_dev)->minor);
2083
2084 dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2085 port_type, port_dev);
2086 }
2087
hso_start_net_device(struct hso_device * hso_dev)2088 static int hso_start_net_device(struct hso_device *hso_dev)
2089 {
2090 int i, result = 0;
2091 struct hso_net *hso_net = dev2net(hso_dev);
2092
2093 if (!hso_net)
2094 return -ENODEV;
2095
2096 /* send URBs for all read buffers */
2097 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2098
2099 /* Prep a receive URB */
2100 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2101 hso_dev->usb,
2102 usb_rcvbulkpipe(hso_dev->usb,
2103 hso_net->in_endp->
2104 bEndpointAddress & 0x7F),
2105 hso_net->mux_bulk_rx_buf_pool[i],
2106 MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2107 hso_net);
2108
2109 /* Put it out there so the device can send us stuff */
2110 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2111 GFP_NOIO);
2112 if (result)
2113 dev_warn(&hso_dev->usb->dev,
2114 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2115 i, result);
2116 }
2117
2118 return result;
2119 }
2120
hso_stop_net_device(struct hso_device * hso_dev)2121 static int hso_stop_net_device(struct hso_device *hso_dev)
2122 {
2123 int i;
2124 struct hso_net *hso_net = dev2net(hso_dev);
2125
2126 if (!hso_net)
2127 return -ENODEV;
2128
2129 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2130 if (hso_net->mux_bulk_rx_urb_pool[i])
2131 usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2132
2133 }
2134 if (hso_net->mux_bulk_tx_urb)
2135 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2136
2137 return 0;
2138 }
2139
hso_start_serial_device(struct hso_device * hso_dev,gfp_t flags)2140 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2141 {
2142 int i, result = 0;
2143 struct hso_serial *serial = dev2ser(hso_dev);
2144
2145 if (!serial)
2146 return -ENODEV;
2147
2148 /* If it is not the MUX port fill in and submit a bulk urb (already
2149 * allocated in hso_serial_start) */
2150 if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2151 for (i = 0; i < serial->num_rx_urbs; i++) {
2152 usb_fill_bulk_urb(serial->rx_urb[i],
2153 serial->parent->usb,
2154 usb_rcvbulkpipe(serial->parent->usb,
2155 serial->in_endp->
2156 bEndpointAddress &
2157 0x7F),
2158 serial->rx_data[i],
2159 serial->rx_data_length,
2160 hso_std_serial_read_bulk_callback,
2161 serial);
2162 result = usb_submit_urb(serial->rx_urb[i], flags);
2163 if (result) {
2164 dev_warn(&serial->parent->usb->dev,
2165 "Failed to submit urb - res %d\n",
2166 result);
2167 break;
2168 }
2169 }
2170 } else {
2171 mutex_lock(&serial->shared_int->shared_int_lock);
2172 if (!serial->shared_int->use_count) {
2173 result =
2174 hso_mux_submit_intr_urb(serial->shared_int,
2175 hso_dev->usb, flags);
2176 }
2177 serial->shared_int->use_count++;
2178 mutex_unlock(&serial->shared_int->shared_int_lock);
2179 }
2180 if (serial->tiocmget)
2181 tiocmget_submit_urb(serial,
2182 serial->tiocmget,
2183 serial->parent->usb);
2184 return result;
2185 }
2186
hso_stop_serial_device(struct hso_device * hso_dev)2187 static int hso_stop_serial_device(struct hso_device *hso_dev)
2188 {
2189 int i;
2190 struct hso_serial *serial = dev2ser(hso_dev);
2191 struct hso_tiocmget *tiocmget;
2192
2193 if (!serial)
2194 return -ENODEV;
2195
2196 for (i = 0; i < serial->num_rx_urbs; i++) {
2197 if (serial->rx_urb[i]) {
2198 usb_kill_urb(serial->rx_urb[i]);
2199 serial->rx_urb_filled[i] = 0;
2200 }
2201 }
2202 serial->curr_rx_urb_idx = 0;
2203
2204 if (serial->tx_urb)
2205 usb_kill_urb(serial->tx_urb);
2206
2207 if (serial->shared_int) {
2208 mutex_lock(&serial->shared_int->shared_int_lock);
2209 if (serial->shared_int->use_count &&
2210 (--serial->shared_int->use_count == 0)) {
2211 struct urb *urb;
2212
2213 urb = serial->shared_int->shared_intr_urb;
2214 if (urb)
2215 usb_kill_urb(urb);
2216 }
2217 mutex_unlock(&serial->shared_int->shared_int_lock);
2218 }
2219 tiocmget = serial->tiocmget;
2220 if (tiocmget) {
2221 wake_up_interruptible(&tiocmget->waitq);
2222 usb_kill_urb(tiocmget->urb);
2223 }
2224
2225 return 0;
2226 }
2227
hso_serial_tty_unregister(struct hso_serial * serial)2228 static void hso_serial_tty_unregister(struct hso_serial *serial)
2229 {
2230 tty_unregister_device(tty_drv, serial->minor);
2231 release_minor(serial);
2232 }
2233
hso_serial_common_free(struct hso_serial * serial)2234 static void hso_serial_common_free(struct hso_serial *serial)
2235 {
2236 int i;
2237
2238 for (i = 0; i < serial->num_rx_urbs; i++) {
2239 /* unlink and free RX URB */
2240 usb_free_urb(serial->rx_urb[i]);
2241 /* free the RX buffer */
2242 kfree(serial->rx_data[i]);
2243 }
2244
2245 /* unlink and free TX URB */
2246 usb_free_urb(serial->tx_urb);
2247 kfree(serial->tx_buffer);
2248 kfree(serial->tx_data);
2249 tty_port_destroy(&serial->port);
2250 }
2251
hso_serial_common_create(struct hso_serial * serial,int num_urbs,int rx_size,int tx_size)2252 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2253 int rx_size, int tx_size)
2254 {
2255 int i;
2256
2257 tty_port_init(&serial->port);
2258
2259 if (obtain_minor(serial))
2260 goto exit2;
2261
2262 /* register our minor number */
2263 serial->parent->dev = tty_port_register_device_attr(&serial->port,
2264 tty_drv, serial->minor, &serial->parent->interface->dev,
2265 serial->parent, hso_serial_dev_groups);
2266 if (IS_ERR(serial->parent->dev)) {
2267 release_minor(serial);
2268 goto exit2;
2269 }
2270
2271 serial->magic = HSO_SERIAL_MAGIC;
2272 spin_lock_init(&serial->serial_lock);
2273 serial->num_rx_urbs = num_urbs;
2274
2275 /* RX, allocate urb and initialize */
2276
2277 /* prepare our RX buffer */
2278 serial->rx_data_length = rx_size;
2279 for (i = 0; i < serial->num_rx_urbs; i++) {
2280 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2281 if (!serial->rx_urb[i])
2282 goto exit;
2283 serial->rx_urb[i]->transfer_buffer = NULL;
2284 serial->rx_urb[i]->transfer_buffer_length = 0;
2285 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2286 GFP_KERNEL);
2287 if (!serial->rx_data[i])
2288 goto exit;
2289 }
2290
2291 /* TX, allocate urb and initialize */
2292 serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2293 if (!serial->tx_urb)
2294 goto exit;
2295 serial->tx_urb->transfer_buffer = NULL;
2296 serial->tx_urb->transfer_buffer_length = 0;
2297 /* prepare our TX buffer */
2298 serial->tx_data_count = 0;
2299 serial->tx_buffer_count = 0;
2300 serial->tx_data_length = tx_size;
2301 serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2302 if (!serial->tx_data)
2303 goto exit;
2304
2305 serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2306 if (!serial->tx_buffer)
2307 goto exit;
2308
2309 return 0;
2310 exit:
2311 hso_serial_tty_unregister(serial);
2312 exit2:
2313 hso_serial_common_free(serial);
2314 return -1;
2315 }
2316
2317 /* Creates a general hso device */
hso_create_device(struct usb_interface * intf,int port_spec)2318 static struct hso_device *hso_create_device(struct usb_interface *intf,
2319 int port_spec)
2320 {
2321 struct hso_device *hso_dev;
2322
2323 hso_dev = kzalloc(sizeof(*hso_dev), GFP_KERNEL);
2324 if (!hso_dev)
2325 return NULL;
2326
2327 hso_dev->port_spec = port_spec;
2328 hso_dev->usb = interface_to_usbdev(intf);
2329 hso_dev->interface = intf;
2330 kref_init(&hso_dev->ref);
2331 mutex_init(&hso_dev->mutex);
2332
2333 INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2334 INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2335
2336 return hso_dev;
2337 }
2338
2339 /* Removes a network device in the network device table */
remove_net_device(struct hso_device * hso_dev)2340 static int remove_net_device(struct hso_device *hso_dev)
2341 {
2342 int i;
2343
2344 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2345 if (network_table[i] == hso_dev) {
2346 network_table[i] = NULL;
2347 break;
2348 }
2349 }
2350 if (i == HSO_MAX_NET_DEVICES)
2351 return -1;
2352 return 0;
2353 }
2354
2355 /* Frees our network device */
hso_free_net_device(struct hso_device * hso_dev)2356 static void hso_free_net_device(struct hso_device *hso_dev)
2357 {
2358 int i;
2359 struct hso_net *hso_net = dev2net(hso_dev);
2360
2361 if (!hso_net)
2362 return;
2363
2364 remove_net_device(hso_net->parent);
2365
2366 if (hso_net->net)
2367 unregister_netdev(hso_net->net);
2368
2369 /* start freeing */
2370 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2371 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2372 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2373 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2374 }
2375 usb_free_urb(hso_net->mux_bulk_tx_urb);
2376 kfree(hso_net->mux_bulk_tx_buf);
2377 hso_net->mux_bulk_tx_buf = NULL;
2378
2379 if (hso_net->net)
2380 free_netdev(hso_net->net);
2381
2382 kfree(hso_dev);
2383 }
2384
2385 static const struct net_device_ops hso_netdev_ops = {
2386 .ndo_open = hso_net_open,
2387 .ndo_stop = hso_net_close,
2388 .ndo_start_xmit = hso_net_start_xmit,
2389 .ndo_tx_timeout = hso_net_tx_timeout,
2390 };
2391
2392 /* initialize the network interface */
hso_net_init(struct net_device * net)2393 static void hso_net_init(struct net_device *net)
2394 {
2395 struct hso_net *hso_net = netdev_priv(net);
2396
2397 hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2398
2399 /* fill in the other fields */
2400 net->netdev_ops = &hso_netdev_ops;
2401 net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2402 net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2403 net->type = ARPHRD_NONE;
2404 net->mtu = DEFAULT_MTU - 14;
2405 net->tx_queue_len = 10;
2406 net->ethtool_ops = &ops;
2407
2408 /* and initialize the semaphore */
2409 spin_lock_init(&hso_net->net_lock);
2410 }
2411
2412 /* Adds a network device in the network device table */
add_net_device(struct hso_device * hso_dev)2413 static int add_net_device(struct hso_device *hso_dev)
2414 {
2415 int i;
2416
2417 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2418 if (network_table[i] == NULL) {
2419 network_table[i] = hso_dev;
2420 break;
2421 }
2422 }
2423 if (i == HSO_MAX_NET_DEVICES)
2424 return -1;
2425 return 0;
2426 }
2427
hso_rfkill_set_block(void * data,bool blocked)2428 static int hso_rfkill_set_block(void *data, bool blocked)
2429 {
2430 struct hso_device *hso_dev = data;
2431 int enabled = !blocked;
2432 int rv;
2433
2434 mutex_lock(&hso_dev->mutex);
2435 if (hso_dev->usb_gone)
2436 rv = 0;
2437 else
2438 rv = usb_control_msg(hso_dev->usb, usb_sndctrlpipe(hso_dev->usb, 0),
2439 enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2440 USB_CTRL_SET_TIMEOUT);
2441 mutex_unlock(&hso_dev->mutex);
2442 return rv;
2443 }
2444
2445 static const struct rfkill_ops hso_rfkill_ops = {
2446 .set_block = hso_rfkill_set_block,
2447 };
2448
2449 /* Creates and sets up everything for rfkill */
hso_create_rfkill(struct hso_device * hso_dev,struct usb_interface * interface)2450 static void hso_create_rfkill(struct hso_device *hso_dev,
2451 struct usb_interface *interface)
2452 {
2453 struct hso_net *hso_net = dev2net(hso_dev);
2454 struct device *dev = &hso_net->net->dev;
2455 static u32 rfkill_counter;
2456
2457 snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2458 rfkill_counter++);
2459
2460 hso_net->rfkill = rfkill_alloc(hso_net->name,
2461 &interface_to_usbdev(interface)->dev,
2462 RFKILL_TYPE_WWAN,
2463 &hso_rfkill_ops, hso_dev);
2464 if (!hso_net->rfkill)
2465 return;
2466
2467 if (rfkill_register(hso_net->rfkill) < 0) {
2468 rfkill_destroy(hso_net->rfkill);
2469 hso_net->rfkill = NULL;
2470 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2471 return;
2472 }
2473 }
2474
2475 static struct device_type hso_type = {
2476 .name = "wwan",
2477 };
2478
2479 /* Creates our network device */
hso_create_net_device(struct usb_interface * interface,int port_spec)2480 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2481 int port_spec)
2482 {
2483 int result, i;
2484 struct net_device *net;
2485 struct hso_net *hso_net;
2486 struct hso_device *hso_dev;
2487
2488 hso_dev = hso_create_device(interface, port_spec);
2489 if (!hso_dev)
2490 return NULL;
2491
2492 /* allocate our network device, then we can put in our private data */
2493 /* call hso_net_init to do the basic initialization */
2494 net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2495 hso_net_init);
2496 if (!net) {
2497 dev_err(&interface->dev, "Unable to create ethernet device\n");
2498 goto err_hso_dev;
2499 }
2500
2501 hso_net = netdev_priv(net);
2502
2503 hso_dev->port_data.dev_net = hso_net;
2504 hso_net->net = net;
2505 hso_net->parent = hso_dev;
2506
2507 hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2508 USB_DIR_IN);
2509 if (!hso_net->in_endp) {
2510 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2511 goto err_net;
2512 }
2513 hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2514 USB_DIR_OUT);
2515 if (!hso_net->out_endp) {
2516 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2517 goto err_net;
2518 }
2519 SET_NETDEV_DEV(net, &interface->dev);
2520 SET_NETDEV_DEVTYPE(net, &hso_type);
2521
2522 /* start allocating */
2523 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2524 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2525 if (!hso_net->mux_bulk_rx_urb_pool[i])
2526 goto err_mux_bulk_rx;
2527 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2528 GFP_KERNEL);
2529 if (!hso_net->mux_bulk_rx_buf_pool[i])
2530 goto err_mux_bulk_rx;
2531 }
2532 hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2533 if (!hso_net->mux_bulk_tx_urb)
2534 goto err_mux_bulk_rx;
2535 hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2536 if (!hso_net->mux_bulk_tx_buf)
2537 goto err_free_tx_urb;
2538
2539 result = add_net_device(hso_dev);
2540 if (result) {
2541 dev_err(&interface->dev, "Failed to add net device\n");
2542 goto err_free_tx_buf;
2543 }
2544
2545 /* registering our net device */
2546 result = register_netdev(net);
2547 if (result) {
2548 dev_err(&interface->dev, "Failed to register device\n");
2549 goto err_rmv_ndev;
2550 }
2551
2552 hso_log_port(hso_dev);
2553
2554 hso_create_rfkill(hso_dev, interface);
2555
2556 return hso_dev;
2557
2558 err_rmv_ndev:
2559 remove_net_device(hso_dev);
2560 err_free_tx_buf:
2561 kfree(hso_net->mux_bulk_tx_buf);
2562 err_free_tx_urb:
2563 usb_free_urb(hso_net->mux_bulk_tx_urb);
2564 err_mux_bulk_rx:
2565 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2566 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2567 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2568 }
2569 err_net:
2570 free_netdev(net);
2571 err_hso_dev:
2572 kfree(hso_dev);
2573 return NULL;
2574 }
2575
hso_free_tiomget(struct hso_serial * serial)2576 static void hso_free_tiomget(struct hso_serial *serial)
2577 {
2578 struct hso_tiocmget *tiocmget;
2579 if (!serial)
2580 return;
2581 tiocmget = serial->tiocmget;
2582 if (tiocmget) {
2583 usb_free_urb(tiocmget->urb);
2584 tiocmget->urb = NULL;
2585 serial->tiocmget = NULL;
2586 kfree(tiocmget->serial_state_notification);
2587 tiocmget->serial_state_notification = NULL;
2588 kfree(tiocmget);
2589 }
2590 }
2591
2592 /* Frees an AT channel ( goes for both mux and non-mux ) */
hso_free_serial_device(struct hso_device * hso_dev)2593 static void hso_free_serial_device(struct hso_device *hso_dev)
2594 {
2595 struct hso_serial *serial = dev2ser(hso_dev);
2596
2597 if (!serial)
2598 return;
2599
2600 hso_serial_common_free(serial);
2601
2602 if (serial->shared_int) {
2603 mutex_lock(&serial->shared_int->shared_int_lock);
2604 if (--serial->shared_int->ref_count == 0)
2605 hso_free_shared_int(serial->shared_int);
2606 else
2607 mutex_unlock(&serial->shared_int->shared_int_lock);
2608 }
2609 hso_free_tiomget(serial);
2610 kfree(serial);
2611 kfree(hso_dev);
2612 }
2613
2614 /* Creates a bulk AT channel */
hso_create_bulk_serial_device(struct usb_interface * interface,int port)2615 static struct hso_device *hso_create_bulk_serial_device(
2616 struct usb_interface *interface, int port)
2617 {
2618 struct hso_device *hso_dev;
2619 struct hso_serial *serial;
2620 int num_urbs;
2621 struct hso_tiocmget *tiocmget;
2622
2623 hso_dev = hso_create_device(interface, port);
2624 if (!hso_dev)
2625 return NULL;
2626
2627 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2628 if (!serial)
2629 goto exit;
2630
2631 serial->parent = hso_dev;
2632 hso_dev->port_data.dev_serial = serial;
2633
2634 if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2635 num_urbs = 2;
2636 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2637 GFP_KERNEL);
2638 if (!serial->tiocmget)
2639 goto exit;
2640 serial->tiocmget->serial_state_notification
2641 = kzalloc(sizeof(struct hso_serial_state_notification),
2642 GFP_KERNEL);
2643 if (!serial->tiocmget->serial_state_notification)
2644 goto exit;
2645 tiocmget = serial->tiocmget;
2646 tiocmget->endp = hso_get_ep(interface,
2647 USB_ENDPOINT_XFER_INT,
2648 USB_DIR_IN);
2649 if (!tiocmget->endp) {
2650 dev_err(&interface->dev, "Failed to find INT IN ep\n");
2651 goto exit;
2652 }
2653
2654 tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2655 if (!tiocmget->urb)
2656 goto exit;
2657
2658 mutex_init(&tiocmget->mutex);
2659 init_waitqueue_head(&tiocmget->waitq);
2660 } else {
2661 num_urbs = 1;
2662 }
2663
2664 if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2665 BULK_URB_TX_SIZE))
2666 goto exit;
2667
2668 serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2669 USB_DIR_IN);
2670 if (!serial->in_endp) {
2671 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2672 goto exit2;
2673 }
2674
2675 if (!
2676 (serial->out_endp =
2677 hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2678 dev_err(&interface->dev, "Failed to find BULK OUT ep\n");
2679 goto exit2;
2680 }
2681
2682 serial->write_data = hso_std_serial_write_data;
2683
2684 /* setup the proc dirs and files if needed */
2685 hso_log_port(hso_dev);
2686
2687 /* done, return it */
2688 return hso_dev;
2689
2690 exit2:
2691 hso_serial_tty_unregister(serial);
2692 hso_serial_common_free(serial);
2693 exit:
2694 hso_free_tiomget(serial);
2695 kfree(serial);
2696 kfree(hso_dev);
2697 return NULL;
2698 }
2699
2700 /* Creates a multiplexed AT channel */
2701 static
hso_create_mux_serial_device(struct usb_interface * interface,int port,struct hso_shared_int * mux)2702 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2703 int port,
2704 struct hso_shared_int *mux)
2705 {
2706 struct hso_device *hso_dev;
2707 struct hso_serial *serial;
2708 int port_spec;
2709
2710 port_spec = HSO_INTF_MUX;
2711 port_spec &= ~HSO_PORT_MASK;
2712
2713 port_spec |= hso_mux_to_port(port);
2714 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2715 return NULL;
2716
2717 hso_dev = hso_create_device(interface, port_spec);
2718 if (!hso_dev)
2719 return NULL;
2720
2721 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2722 if (!serial)
2723 goto err_free_dev;
2724
2725 hso_dev->port_data.dev_serial = serial;
2726 serial->parent = hso_dev;
2727
2728 if (hso_serial_common_create
2729 (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2730 goto err_free_serial;
2731
2732 serial->tx_data_length--;
2733 serial->write_data = hso_mux_serial_write_data;
2734
2735 serial->shared_int = mux;
2736 mutex_lock(&serial->shared_int->shared_int_lock);
2737 serial->shared_int->ref_count++;
2738 mutex_unlock(&serial->shared_int->shared_int_lock);
2739
2740 /* setup the proc dirs and files if needed */
2741 hso_log_port(hso_dev);
2742
2743 /* done, return it */
2744 return hso_dev;
2745
2746 err_free_serial:
2747 kfree(serial);
2748 err_free_dev:
2749 kfree(hso_dev);
2750 return NULL;
2751
2752 }
2753
hso_free_shared_int(struct hso_shared_int * mux)2754 static void hso_free_shared_int(struct hso_shared_int *mux)
2755 {
2756 usb_free_urb(mux->shared_intr_urb);
2757 kfree(mux->shared_intr_buf);
2758 mutex_unlock(&mux->shared_int_lock);
2759 kfree(mux);
2760 }
2761
2762 static
hso_create_shared_int(struct usb_interface * interface)2763 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2764 {
2765 struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2766
2767 if (!mux)
2768 return NULL;
2769
2770 mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2771 USB_DIR_IN);
2772 if (!mux->intr_endp) {
2773 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2774 goto exit;
2775 }
2776
2777 mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2778 if (!mux->shared_intr_urb)
2779 goto exit;
2780 mux->shared_intr_buf =
2781 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2782 GFP_KERNEL);
2783 if (!mux->shared_intr_buf)
2784 goto exit;
2785
2786 mutex_init(&mux->shared_int_lock);
2787
2788 return mux;
2789
2790 exit:
2791 kfree(mux->shared_intr_buf);
2792 usb_free_urb(mux->shared_intr_urb);
2793 kfree(mux);
2794 return NULL;
2795 }
2796
2797 /* Gets the port spec for a certain interface */
hso_get_config_data(struct usb_interface * interface)2798 static int hso_get_config_data(struct usb_interface *interface)
2799 {
2800 struct usb_device *usbdev = interface_to_usbdev(interface);
2801 u8 *config_data = kmalloc(17, GFP_KERNEL);
2802 u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2803 s32 result;
2804
2805 if (!config_data)
2806 return -ENOMEM;
2807 if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2808 0x86, 0xC0, 0, 0, config_data, 17,
2809 USB_CTRL_SET_TIMEOUT) != 0x11) {
2810 kfree(config_data);
2811 return -EIO;
2812 }
2813
2814 /* check if we have a valid interface */
2815 if (if_num > 16) {
2816 kfree(config_data);
2817 return -EINVAL;
2818 }
2819
2820 switch (config_data[if_num]) {
2821 case 0x0:
2822 result = 0;
2823 break;
2824 case 0x1:
2825 result = HSO_PORT_DIAG;
2826 break;
2827 case 0x2:
2828 result = HSO_PORT_GPS;
2829 break;
2830 case 0x3:
2831 result = HSO_PORT_GPS_CONTROL;
2832 break;
2833 case 0x4:
2834 result = HSO_PORT_APP;
2835 break;
2836 case 0x5:
2837 result = HSO_PORT_APP2;
2838 break;
2839 case 0x6:
2840 result = HSO_PORT_CONTROL;
2841 break;
2842 case 0x7:
2843 result = HSO_PORT_NETWORK;
2844 break;
2845 case 0x8:
2846 result = HSO_PORT_MODEM;
2847 break;
2848 case 0x9:
2849 result = HSO_PORT_MSD;
2850 break;
2851 case 0xa:
2852 result = HSO_PORT_PCSC;
2853 break;
2854 case 0xb:
2855 result = HSO_PORT_VOICE;
2856 break;
2857 default:
2858 result = 0;
2859 }
2860
2861 if (result)
2862 result |= HSO_INTF_BULK;
2863
2864 if (config_data[16] & 0x1)
2865 result |= HSO_INFO_CRC_BUG;
2866
2867 kfree(config_data);
2868 return result;
2869 }
2870
2871 /* called once for each interface upon device insertion */
hso_probe(struct usb_interface * interface,const struct usb_device_id * id)2872 static int hso_probe(struct usb_interface *interface,
2873 const struct usb_device_id *id)
2874 {
2875 int mux, i, if_num, port_spec;
2876 unsigned char port_mask;
2877 struct hso_device *hso_dev = NULL;
2878 struct hso_shared_int *shared_int;
2879 struct hso_device *tmp_dev = NULL;
2880
2881 if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2882 dev_err(&interface->dev, "Not our interface\n");
2883 return -ENODEV;
2884 }
2885
2886 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2887
2888 /* Get the interface/port specification from either driver_info or from
2889 * the device itself */
2890 if (id->driver_info) {
2891 /* if_num is controlled by the device, driver_info is a 0 terminated
2892 * array. Make sure, the access is in bounds! */
2893 for (i = 0; i <= if_num; ++i)
2894 if (((u32 *)(id->driver_info))[i] == 0)
2895 goto exit;
2896 port_spec = ((u32 *)(id->driver_info))[if_num];
2897 } else {
2898 port_spec = hso_get_config_data(interface);
2899 if (port_spec < 0)
2900 goto exit;
2901 }
2902
2903 /* Check if we need to switch to alt interfaces prior to port
2904 * configuration */
2905 if (interface->num_altsetting > 1)
2906 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2907 interface->needs_remote_wakeup = 1;
2908
2909 /* Allocate new hso device(s) */
2910 switch (port_spec & HSO_INTF_MASK) {
2911 case HSO_INTF_MUX:
2912 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2913 /* Create the network device */
2914 if (!disable_net) {
2915 hso_dev = hso_create_net_device(interface,
2916 port_spec);
2917 if (!hso_dev)
2918 goto exit;
2919 tmp_dev = hso_dev;
2920 }
2921 }
2922
2923 if (hso_get_mux_ports(interface, &port_mask))
2924 /* TODO: de-allocate everything */
2925 goto exit;
2926
2927 shared_int = hso_create_shared_int(interface);
2928 if (!shared_int)
2929 goto exit;
2930
2931 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2932 if (port_mask & i) {
2933 hso_dev = hso_create_mux_serial_device(
2934 interface, i, shared_int);
2935 if (!hso_dev)
2936 goto exit;
2937 }
2938 }
2939
2940 if (tmp_dev)
2941 hso_dev = tmp_dev;
2942 break;
2943
2944 case HSO_INTF_BULK:
2945 /* It's a regular bulk interface */
2946 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2947 if (!disable_net)
2948 hso_dev =
2949 hso_create_net_device(interface, port_spec);
2950 } else {
2951 hso_dev =
2952 hso_create_bulk_serial_device(interface, port_spec);
2953 }
2954 if (!hso_dev)
2955 goto exit;
2956 break;
2957 default:
2958 goto exit;
2959 }
2960
2961 /* save our data pointer in this device */
2962 usb_set_intfdata(interface, hso_dev);
2963
2964 /* done */
2965 return 0;
2966 exit:
2967 hso_free_interface(interface);
2968 return -ENODEV;
2969 }
2970
2971 /* device removed, cleaning up */
hso_disconnect(struct usb_interface * interface)2972 static void hso_disconnect(struct usb_interface *interface)
2973 {
2974 hso_free_interface(interface);
2975
2976 /* remove reference of our private data */
2977 usb_set_intfdata(interface, NULL);
2978 }
2979
async_get_intf(struct work_struct * data)2980 static void async_get_intf(struct work_struct *data)
2981 {
2982 struct hso_device *hso_dev =
2983 container_of(data, struct hso_device, async_get_intf);
2984 usb_autopm_get_interface(hso_dev->interface);
2985 }
2986
async_put_intf(struct work_struct * data)2987 static void async_put_intf(struct work_struct *data)
2988 {
2989 struct hso_device *hso_dev =
2990 container_of(data, struct hso_device, async_put_intf);
2991 usb_autopm_put_interface(hso_dev->interface);
2992 }
2993
hso_get_activity(struct hso_device * hso_dev)2994 static int hso_get_activity(struct hso_device *hso_dev)
2995 {
2996 if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
2997 if (!hso_dev->is_active) {
2998 hso_dev->is_active = 1;
2999 schedule_work(&hso_dev->async_get_intf);
3000 }
3001 }
3002
3003 if (hso_dev->usb->state != USB_STATE_CONFIGURED)
3004 return -EAGAIN;
3005
3006 usb_mark_last_busy(hso_dev->usb);
3007
3008 return 0;
3009 }
3010
hso_put_activity(struct hso_device * hso_dev)3011 static int hso_put_activity(struct hso_device *hso_dev)
3012 {
3013 if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
3014 if (hso_dev->is_active) {
3015 hso_dev->is_active = 0;
3016 schedule_work(&hso_dev->async_put_intf);
3017 return -EAGAIN;
3018 }
3019 }
3020 hso_dev->is_active = 0;
3021 return 0;
3022 }
3023
3024 /* called by kernel when we need to suspend device */
hso_suspend(struct usb_interface * iface,pm_message_t message)3025 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3026 {
3027 int i, result;
3028
3029 /* Stop all serial ports */
3030 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3031 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3032 result = hso_stop_serial_device(serial_table[i]);
3033 if (result)
3034 goto out;
3035 }
3036 }
3037
3038 /* Stop all network ports */
3039 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3040 if (network_table[i] &&
3041 (network_table[i]->interface == iface)) {
3042 result = hso_stop_net_device(network_table[i]);
3043 if (result)
3044 goto out;
3045 }
3046 }
3047
3048 out:
3049 return 0;
3050 }
3051
3052 /* called by kernel when we need to resume device */
hso_resume(struct usb_interface * iface)3053 static int hso_resume(struct usb_interface *iface)
3054 {
3055 int i, result = 0;
3056 struct hso_net *hso_net;
3057
3058 /* Start all serial ports */
3059 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3060 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3061 if (dev2ser(serial_table[i])->port.count) {
3062 result =
3063 hso_start_serial_device(serial_table[i], GFP_NOIO);
3064 hso_kick_transmit(dev2ser(serial_table[i]));
3065 if (result)
3066 goto out;
3067 }
3068 }
3069 }
3070
3071 /* Start all network ports */
3072 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3073 if (network_table[i] &&
3074 (network_table[i]->interface == iface)) {
3075 hso_net = dev2net(network_table[i]);
3076 if (hso_net->flags & IFF_UP) {
3077 /* First transmit any lingering data,
3078 then restart the device. */
3079 if (hso_net->skb_tx_buf) {
3080 dev_dbg(&iface->dev,
3081 "Transmitting"
3082 " lingering data\n");
3083 hso_net_start_xmit(hso_net->skb_tx_buf,
3084 hso_net->net);
3085 hso_net->skb_tx_buf = NULL;
3086 }
3087 result = hso_start_net_device(network_table[i]);
3088 if (result)
3089 goto out;
3090 }
3091 }
3092 }
3093
3094 out:
3095 return result;
3096 }
3097
hso_serial_ref_free(struct kref * ref)3098 static void hso_serial_ref_free(struct kref *ref)
3099 {
3100 struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3101
3102 hso_free_serial_device(hso_dev);
3103 }
3104
hso_free_interface(struct usb_interface * interface)3105 static void hso_free_interface(struct usb_interface *interface)
3106 {
3107 struct hso_serial *serial;
3108 int i;
3109
3110 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3111 if (serial_table[i] &&
3112 (serial_table[i]->interface == interface)) {
3113 serial = dev2ser(serial_table[i]);
3114 tty_port_tty_hangup(&serial->port, false);
3115 mutex_lock(&serial->parent->mutex);
3116 serial->parent->usb_gone = 1;
3117 mutex_unlock(&serial->parent->mutex);
3118 cancel_work_sync(&serial_table[i]->async_put_intf);
3119 cancel_work_sync(&serial_table[i]->async_get_intf);
3120 hso_serial_tty_unregister(serial);
3121 kref_put(&serial->parent->ref, hso_serial_ref_free);
3122 }
3123 }
3124
3125 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3126 if (network_table[i] &&
3127 (network_table[i]->interface == interface)) {
3128 struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3129 /* hso_stop_net_device doesn't stop the net queue since
3130 * traffic needs to start it again when suspended */
3131 netif_stop_queue(dev2net(network_table[i])->net);
3132 hso_stop_net_device(network_table[i]);
3133 cancel_work_sync(&network_table[i]->async_put_intf);
3134 cancel_work_sync(&network_table[i]->async_get_intf);
3135 if (rfk) {
3136 rfkill_unregister(rfk);
3137 rfkill_destroy(rfk);
3138 }
3139 hso_free_net_device(network_table[i]);
3140 }
3141 }
3142 }
3143
3144 /* Helper functions */
3145
3146 /* Get the endpoint ! */
hso_get_ep(struct usb_interface * intf,int type,int dir)3147 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3148 int type, int dir)
3149 {
3150 int i;
3151 struct usb_host_interface *iface = intf->cur_altsetting;
3152 struct usb_endpoint_descriptor *endp;
3153
3154 for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3155 endp = &iface->endpoint[i].desc;
3156 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3157 (usb_endpoint_type(endp) == type))
3158 return endp;
3159 }
3160
3161 return NULL;
3162 }
3163
3164 /* Get the byte that describes which ports are enabled */
hso_get_mux_ports(struct usb_interface * intf,unsigned char * ports)3165 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3166 {
3167 int i;
3168 struct usb_host_interface *iface = intf->cur_altsetting;
3169
3170 if (iface->extralen == 3) {
3171 *ports = iface->extra[2];
3172 return 0;
3173 }
3174
3175 for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3176 if (iface->endpoint[i].extralen == 3) {
3177 *ports = iface->endpoint[i].extra[2];
3178 return 0;
3179 }
3180 }
3181
3182 return -1;
3183 }
3184
3185 /* interrupt urb needs to be submitted, used for serial read of muxed port */
hso_mux_submit_intr_urb(struct hso_shared_int * shared_int,struct usb_device * usb,gfp_t gfp)3186 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3187 struct usb_device *usb, gfp_t gfp)
3188 {
3189 int result;
3190
3191 usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3192 usb_rcvintpipe(usb,
3193 shared_int->intr_endp->bEndpointAddress & 0x7F),
3194 shared_int->shared_intr_buf,
3195 1,
3196 intr_callback, shared_int,
3197 shared_int->intr_endp->bInterval);
3198
3199 result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3200 if (result)
3201 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3202 result);
3203
3204 return result;
3205 }
3206
3207 /* operations setup of the serial interface */
3208 static const struct tty_operations hso_serial_ops = {
3209 .open = hso_serial_open,
3210 .close = hso_serial_close,
3211 .write = hso_serial_write,
3212 .write_room = hso_serial_write_room,
3213 .cleanup = hso_serial_cleanup,
3214 .ioctl = hso_serial_ioctl,
3215 .set_termios = hso_serial_set_termios,
3216 .chars_in_buffer = hso_serial_chars_in_buffer,
3217 .tiocmget = hso_serial_tiocmget,
3218 .tiocmset = hso_serial_tiocmset,
3219 .get_icount = hso_get_count,
3220 .unthrottle = hso_unthrottle
3221 };
3222
3223 static struct usb_driver hso_driver = {
3224 .name = driver_name,
3225 .probe = hso_probe,
3226 .disconnect = hso_disconnect,
3227 .id_table = hso_ids,
3228 .suspend = hso_suspend,
3229 .resume = hso_resume,
3230 .reset_resume = hso_resume,
3231 .supports_autosuspend = 1,
3232 .disable_hub_initiated_lpm = 1,
3233 };
3234
hso_init(void)3235 static int __init hso_init(void)
3236 {
3237 int i;
3238 int result;
3239
3240 /* put it in the log */
3241 pr_info("%s\n", version);
3242
3243 /* Initialise the serial table semaphore and table */
3244 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3245 serial_table[i] = NULL;
3246
3247 /* allocate our driver using the proper amount of supported minors */
3248 tty_drv = tty_alloc_driver(HSO_SERIAL_TTY_MINORS, TTY_DRIVER_REAL_RAW |
3249 TTY_DRIVER_DYNAMIC_DEV);
3250 if (IS_ERR(tty_drv))
3251 return PTR_ERR(tty_drv);
3252
3253 /* fill in all needed values */
3254 tty_drv->driver_name = driver_name;
3255 tty_drv->name = tty_filename;
3256
3257 /* if major number is provided as parameter, use that one */
3258 if (tty_major)
3259 tty_drv->major = tty_major;
3260
3261 tty_drv->minor_start = 0;
3262 tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3263 tty_drv->subtype = SERIAL_TYPE_NORMAL;
3264 tty_drv->init_termios = tty_std_termios;
3265 hso_init_termios(&tty_drv->init_termios);
3266 tty_set_operations(tty_drv, &hso_serial_ops);
3267
3268 /* register the tty driver */
3269 result = tty_register_driver(tty_drv);
3270 if (result) {
3271 pr_err("%s - tty_register_driver failed(%d)\n",
3272 __func__, result);
3273 goto err_free_tty;
3274 }
3275
3276 /* register this module as an usb driver */
3277 result = usb_register(&hso_driver);
3278 if (result) {
3279 pr_err("Could not register hso driver - error: %d\n", result);
3280 goto err_unreg_tty;
3281 }
3282
3283 /* done */
3284 return 0;
3285 err_unreg_tty:
3286 tty_unregister_driver(tty_drv);
3287 err_free_tty:
3288 tty_driver_kref_put(tty_drv);
3289 return result;
3290 }
3291
hso_exit(void)3292 static void __exit hso_exit(void)
3293 {
3294 pr_info("unloaded\n");
3295
3296 tty_unregister_driver(tty_drv);
3297 /* deregister the usb driver */
3298 usb_deregister(&hso_driver);
3299 tty_driver_kref_put(tty_drv);
3300 }
3301
3302 /* Module definitions */
3303 module_init(hso_init);
3304 module_exit(hso_exit);
3305
3306 MODULE_AUTHOR(MOD_AUTHOR);
3307 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3308 MODULE_LICENSE("GPL");
3309
3310 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3311 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3312 module_param(debug, int, 0644);
3313
3314 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3315 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3316 module_param(tty_major, int, 0644);
3317
3318 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3319 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3320 module_param(disable_net, int, 0644);
3321