1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 *
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
7 *
8 * Support to set flow control line levels using TIOCMGET and TIOCMSET
9 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
10 * control thanks to Munir Nassar nassarmu@real-time.com
11 *
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/tty.h>
18 #include <linux/tty_flip.h>
19 #include <linux/module.h>
20 #include <linux/usb.h>
21 #include <linux/usb/serial.h>
22 #include <linux/gpio/driver.h>
23 #include <linux/bitops.h>
24 #include <linux/mutex.h>
25
26 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
27
28 /*
29 * Function Prototypes
30 */
31 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
32 static void cp210x_close(struct usb_serial_port *);
33 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
34 const struct ktermios *);
35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
36 const struct ktermios *);
37 static bool cp210x_tx_empty(struct usb_serial_port *port);
38 static int cp210x_tiocmget(struct tty_struct *);
39 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
40 static int cp210x_tiocmset_port(struct usb_serial_port *port,
41 unsigned int, unsigned int);
42 static void cp210x_break_ctl(struct tty_struct *, int);
43 static int cp210x_attach(struct usb_serial *);
44 static void cp210x_disconnect(struct usb_serial *);
45 static void cp210x_release(struct usb_serial *);
46 static int cp210x_port_probe(struct usb_serial_port *);
47 static void cp210x_port_remove(struct usb_serial_port *);
48 static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
49 static void cp210x_process_read_urb(struct urb *urb);
50 static void cp210x_enable_event_mode(struct usb_serial_port *port);
51 static void cp210x_disable_event_mode(struct usb_serial_port *port);
52
53 static const struct usb_device_id id_table[] = {
54 { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */
55 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
56 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
57 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
58 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
59 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
60 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
61 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
62 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
63 { USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */
64 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
65 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
66 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
67 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
68 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
69 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
70 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
71 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
72 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
73 { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
74 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
75 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
76 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
77 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
78 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
79 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
80 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
81 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
82 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
83 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
84 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
85 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
86 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
87 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
88 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
89 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
90 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
91 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
92 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
93 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
94 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
95 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
96 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
97 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
98 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
99 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
100 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
101 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
102 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
103 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
104 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
105 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
106 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
107 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
108 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
109 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
110 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
111 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
112 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
113 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
114 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
115 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
116 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
117 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
118 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
119 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
120 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
121 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
122 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
123 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
124 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
125 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
126 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
127 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
128 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
129 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
130 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
131 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
132 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
133 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
134 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
135 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
136 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
137 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
138 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
139 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
140 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
141 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
142 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
143 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
144 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
145 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
146 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
147 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
148 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
149 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
150 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
151 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
152 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
153 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
154 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
155 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
156 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
157 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
158 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
159 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
160 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
161 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
162 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
163 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
164 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
165 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
166 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
167 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
168 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
169 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
170 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
171 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
172 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
173 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
174 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
175 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
176 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
177 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
178 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
179 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
180 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
181 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
182 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
183 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
184 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
185 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
186 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
187 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
188 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
189 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
190 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
191 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
192 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
193 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
194 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
195 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
196 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
197 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
198 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
199 { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
200 { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
201 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
202 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
203 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
204 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
205 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
206 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
207 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
208 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
209 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
210 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
211 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
212 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
213 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
214 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
215 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
216 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
217 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
218 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
219 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
220 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
221 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
222 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
223 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
224 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
225 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
226 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
227 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
228 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
229 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
230 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
231 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
232 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
233 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
234 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
235 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
236 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
237 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
238 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
239 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
240 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
241 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
242 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
243 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
244 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
245 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
246 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
247 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
248 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
249 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
250 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
251 { } /* Terminating Entry */
252 };
253
254 MODULE_DEVICE_TABLE(usb, id_table);
255
256 struct cp210x_serial_private {
257 #ifdef CONFIG_GPIOLIB
258 struct gpio_chip gc;
259 bool gpio_registered;
260 u16 gpio_pushpull;
261 u16 gpio_altfunc;
262 u16 gpio_input;
263 #endif
264 u8 partnum;
265 u32 fw_version;
266 speed_t min_speed;
267 speed_t max_speed;
268 bool use_actual_rate;
269 bool no_flow_control;
270 bool no_event_mode;
271 };
272
273 enum cp210x_event_state {
274 ES_DATA,
275 ES_ESCAPE,
276 ES_LSR,
277 ES_LSR_DATA_0,
278 ES_LSR_DATA_1,
279 ES_MSR
280 };
281
282 struct cp210x_port_private {
283 u8 bInterfaceNumber;
284 bool event_mode;
285 enum cp210x_event_state event_state;
286 u8 lsr;
287
288 struct mutex mutex;
289 bool crtscts;
290 bool dtr;
291 bool rts;
292 };
293
294 static struct usb_serial_driver cp210x_device = {
295 .driver = {
296 .owner = THIS_MODULE,
297 .name = "cp210x",
298 },
299 .id_table = id_table,
300 .num_ports = 1,
301 .bulk_in_size = 256,
302 .bulk_out_size = 256,
303 .open = cp210x_open,
304 .close = cp210x_close,
305 .break_ctl = cp210x_break_ctl,
306 .set_termios = cp210x_set_termios,
307 .tx_empty = cp210x_tx_empty,
308 .throttle = usb_serial_generic_throttle,
309 .unthrottle = usb_serial_generic_unthrottle,
310 .tiocmget = cp210x_tiocmget,
311 .tiocmset = cp210x_tiocmset,
312 .get_icount = usb_serial_generic_get_icount,
313 .attach = cp210x_attach,
314 .disconnect = cp210x_disconnect,
315 .release = cp210x_release,
316 .port_probe = cp210x_port_probe,
317 .port_remove = cp210x_port_remove,
318 .dtr_rts = cp210x_dtr_rts,
319 .process_read_urb = cp210x_process_read_urb,
320 };
321
322 static struct usb_serial_driver * const serial_drivers[] = {
323 &cp210x_device, NULL
324 };
325
326 /* Config request types */
327 #define REQTYPE_HOST_TO_INTERFACE 0x41
328 #define REQTYPE_INTERFACE_TO_HOST 0xc1
329 #define REQTYPE_HOST_TO_DEVICE 0x40
330 #define REQTYPE_DEVICE_TO_HOST 0xc0
331
332 /* Config request codes */
333 #define CP210X_IFC_ENABLE 0x00
334 #define CP210X_SET_BAUDDIV 0x01
335 #define CP210X_GET_BAUDDIV 0x02
336 #define CP210X_SET_LINE_CTL 0x03
337 #define CP210X_GET_LINE_CTL 0x04
338 #define CP210X_SET_BREAK 0x05
339 #define CP210X_IMM_CHAR 0x06
340 #define CP210X_SET_MHS 0x07
341 #define CP210X_GET_MDMSTS 0x08
342 #define CP210X_SET_XON 0x09
343 #define CP210X_SET_XOFF 0x0A
344 #define CP210X_SET_EVENTMASK 0x0B
345 #define CP210X_GET_EVENTMASK 0x0C
346 #define CP210X_SET_CHAR 0x0D
347 #define CP210X_GET_CHARS 0x0E
348 #define CP210X_GET_PROPS 0x0F
349 #define CP210X_GET_COMM_STATUS 0x10
350 #define CP210X_RESET 0x11
351 #define CP210X_PURGE 0x12
352 #define CP210X_SET_FLOW 0x13
353 #define CP210X_GET_FLOW 0x14
354 #define CP210X_EMBED_EVENTS 0x15
355 #define CP210X_GET_EVENTSTATE 0x16
356 #define CP210X_SET_CHARS 0x19
357 #define CP210X_GET_BAUDRATE 0x1D
358 #define CP210X_SET_BAUDRATE 0x1E
359 #define CP210X_VENDOR_SPECIFIC 0xFF
360
361 /* CP210X_IFC_ENABLE */
362 #define UART_ENABLE 0x0001
363 #define UART_DISABLE 0x0000
364
365 /* CP210X_(SET|GET)_BAUDDIV */
366 #define BAUD_RATE_GEN_FREQ 0x384000
367
368 /* CP210X_(SET|GET)_LINE_CTL */
369 #define BITS_DATA_MASK 0X0f00
370 #define BITS_DATA_5 0X0500
371 #define BITS_DATA_6 0X0600
372 #define BITS_DATA_7 0X0700
373 #define BITS_DATA_8 0X0800
374 #define BITS_DATA_9 0X0900
375
376 #define BITS_PARITY_MASK 0x00f0
377 #define BITS_PARITY_NONE 0x0000
378 #define BITS_PARITY_ODD 0x0010
379 #define BITS_PARITY_EVEN 0x0020
380 #define BITS_PARITY_MARK 0x0030
381 #define BITS_PARITY_SPACE 0x0040
382
383 #define BITS_STOP_MASK 0x000f
384 #define BITS_STOP_1 0x0000
385 #define BITS_STOP_1_5 0x0001
386 #define BITS_STOP_2 0x0002
387
388 /* CP210X_SET_BREAK */
389 #define BREAK_ON 0x0001
390 #define BREAK_OFF 0x0000
391
392 /* CP210X_(SET_MHS|GET_MDMSTS) */
393 #define CONTROL_DTR 0x0001
394 #define CONTROL_RTS 0x0002
395 #define CONTROL_CTS 0x0010
396 #define CONTROL_DSR 0x0020
397 #define CONTROL_RING 0x0040
398 #define CONTROL_DCD 0x0080
399 #define CONTROL_WRITE_DTR 0x0100
400 #define CONTROL_WRITE_RTS 0x0200
401
402 /* CP210X_(GET|SET)_CHARS */
403 struct cp210x_special_chars {
404 u8 bEofChar;
405 u8 bErrorChar;
406 u8 bBreakChar;
407 u8 bEventChar;
408 u8 bXonChar;
409 u8 bXoffChar;
410 };
411
412 /* CP210X_VENDOR_SPECIFIC values */
413 #define CP210X_GET_FW_VER 0x000E
414 #define CP210X_READ_2NCONFIG 0x000E
415 #define CP210X_GET_FW_VER_2N 0x0010
416 #define CP210X_READ_LATCH 0x00C2
417 #define CP210X_GET_PARTNUM 0x370B
418 #define CP210X_GET_PORTCONFIG 0x370C
419 #define CP210X_GET_DEVICEMODE 0x3711
420 #define CP210X_WRITE_LATCH 0x37E1
421
422 /* Part number definitions */
423 #define CP210X_PARTNUM_CP2101 0x01
424 #define CP210X_PARTNUM_CP2102 0x02
425 #define CP210X_PARTNUM_CP2103 0x03
426 #define CP210X_PARTNUM_CP2104 0x04
427 #define CP210X_PARTNUM_CP2105 0x05
428 #define CP210X_PARTNUM_CP2108 0x08
429 #define CP210X_PARTNUM_CP2102N_QFN28 0x20
430 #define CP210X_PARTNUM_CP2102N_QFN24 0x21
431 #define CP210X_PARTNUM_CP2102N_QFN20 0x22
432 #define CP210X_PARTNUM_UNKNOWN 0xFF
433
434 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
435 struct cp210x_comm_status {
436 __le32 ulErrors;
437 __le32 ulHoldReasons;
438 __le32 ulAmountInInQueue;
439 __le32 ulAmountInOutQueue;
440 u8 bEofReceived;
441 u8 bWaitForImmediate;
442 u8 bReserved;
443 } __packed;
444
445 /*
446 * CP210X_PURGE - 16 bits passed in wValue of USB request.
447 * SiLabs app note AN571 gives a strange description of the 4 bits:
448 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
449 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
450 */
451 #define PURGE_ALL 0x000f
452
453 /* CP210X_EMBED_EVENTS */
454 #define CP210X_ESCCHAR 0xec
455
456 #define CP210X_LSR_OVERRUN BIT(1)
457 #define CP210X_LSR_PARITY BIT(2)
458 #define CP210X_LSR_FRAME BIT(3)
459 #define CP210X_LSR_BREAK BIT(4)
460
461
462 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
463 struct cp210x_flow_ctl {
464 __le32 ulControlHandshake;
465 __le32 ulFlowReplace;
466 __le32 ulXonLimit;
467 __le32 ulXoffLimit;
468 };
469
470 /* cp210x_flow_ctl::ulControlHandshake */
471 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
472 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0)
473 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0)
474 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0)
475 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
476 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
477 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
478 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
479
480 /* cp210x_flow_ctl::ulFlowReplace */
481 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
482 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
483 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
484 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
485 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
486 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
487 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6)
488 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6)
489 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6)
490 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
491
492 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
493 struct cp210x_pin_mode {
494 u8 eci;
495 u8 sci;
496 };
497
498 #define CP210X_PIN_MODE_MODEM 0
499 #define CP210X_PIN_MODE_GPIO BIT(0)
500
501 /*
502 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
503 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
504 */
505 struct cp210x_dual_port_config {
506 __le16 gpio_mode;
507 u8 __pad0[2];
508 __le16 reset_state;
509 u8 __pad1[4];
510 __le16 suspend_state;
511 u8 sci_cfg;
512 u8 eci_cfg;
513 u8 device_cfg;
514 } __packed;
515
516 /*
517 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
518 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
519 */
520 struct cp210x_single_port_config {
521 __le16 gpio_mode;
522 u8 __pad0[2];
523 __le16 reset_state;
524 u8 __pad1[4];
525 __le16 suspend_state;
526 u8 device_cfg;
527 } __packed;
528
529 /* GPIO modes */
530 #define CP210X_SCI_GPIO_MODE_OFFSET 9
531 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
532
533 #define CP210X_ECI_GPIO_MODE_OFFSET 2
534 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
535
536 #define CP210X_GPIO_MODE_OFFSET 8
537 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
538
539 /* CP2105 port configuration values */
540 #define CP2105_GPIO0_TXLED_MODE BIT(0)
541 #define CP2105_GPIO1_RXLED_MODE BIT(1)
542 #define CP2105_GPIO1_RS485_MODE BIT(2)
543
544 /* CP2104 port configuration values */
545 #define CP2104_GPIO0_TXLED_MODE BIT(0)
546 #define CP2104_GPIO1_RXLED_MODE BIT(1)
547 #define CP2104_GPIO2_RS485_MODE BIT(2)
548
549 struct cp210x_quad_port_state {
550 __le16 gpio_mode_pb0;
551 __le16 gpio_mode_pb1;
552 __le16 gpio_mode_pb2;
553 __le16 gpio_mode_pb3;
554 __le16 gpio_mode_pb4;
555
556 __le16 gpio_lowpower_pb0;
557 __le16 gpio_lowpower_pb1;
558 __le16 gpio_lowpower_pb2;
559 __le16 gpio_lowpower_pb3;
560 __le16 gpio_lowpower_pb4;
561
562 __le16 gpio_latch_pb0;
563 __le16 gpio_latch_pb1;
564 __le16 gpio_latch_pb2;
565 __le16 gpio_latch_pb3;
566 __le16 gpio_latch_pb4;
567 };
568
569 /*
570 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
571 * on a CP2108 chip.
572 *
573 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
574 */
575 struct cp210x_quad_port_config {
576 struct cp210x_quad_port_state reset_state;
577 struct cp210x_quad_port_state suspend_state;
578 u8 ipdelay_ifc[4];
579 u8 enhancedfxn_ifc[4];
580 u8 enhancedfxn_device;
581 u8 extclkfreq[4];
582 } __packed;
583
584 #define CP2108_EF_IFC_GPIO_TXLED 0x01
585 #define CP2108_EF_IFC_GPIO_RXLED 0x02
586 #define CP2108_EF_IFC_GPIO_RS485 0x04
587 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08
588 #define CP2108_EF_IFC_GPIO_CLOCK 0x10
589 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40
590
591 /* CP2102N configuration array indices */
592 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
593 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581
594 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
595 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
596
597 /* CP2102N QFN20 port configuration values */
598 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2)
599 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3)
600 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4)
601 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6)
602
603 /*
604 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
605 * for CP2102N, CP2103, CP2104 and CP2105.
606 */
607 struct cp210x_gpio_write {
608 u8 mask;
609 u8 state;
610 };
611
612 /*
613 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
614 * for CP2108.
615 */
616 struct cp210x_gpio_write16 {
617 __le16 mask;
618 __le16 state;
619 };
620
621 /*
622 * Helper to get interface number when we only have struct usb_serial.
623 */
cp210x_interface_num(struct usb_serial * serial)624 static u8 cp210x_interface_num(struct usb_serial *serial)
625 {
626 struct usb_host_interface *cur_altsetting;
627
628 cur_altsetting = serial->interface->cur_altsetting;
629
630 return cur_altsetting->desc.bInterfaceNumber;
631 }
632
633 /*
634 * Reads a variable-sized block of CP210X_ registers, identified by req.
635 * Returns data into buf in native USB byte order.
636 */
cp210x_read_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)637 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
638 void *buf, int bufsize)
639 {
640 struct usb_serial *serial = port->serial;
641 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
642 int result;
643
644
645 result = usb_control_msg_recv(serial->dev, 0, req,
646 REQTYPE_INTERFACE_TO_HOST, 0,
647 port_priv->bInterfaceNumber, buf, bufsize,
648 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
649 if (result) {
650 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
651 req, bufsize, result);
652 return result;
653 }
654
655 return 0;
656 }
657
658 /*
659 * Reads any 8-bit CP210X_ register identified by req.
660 */
cp210x_read_u8_reg(struct usb_serial_port * port,u8 req,u8 * val)661 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
662 {
663 return cp210x_read_reg_block(port, req, val, sizeof(*val));
664 }
665
666 /*
667 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
668 * Returns data into buf in native USB byte order.
669 */
cp210x_read_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)670 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
671 void *buf, int bufsize)
672 {
673 int result;
674
675 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
676 type, val, cp210x_interface_num(serial), buf, bufsize,
677 USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
678 if (result) {
679 dev_err(&serial->interface->dev,
680 "failed to get vendor val 0x%04x size %d: %d\n", val,
681 bufsize, result);
682 return result;
683 }
684
685 return 0;
686 }
687
688 /*
689 * Writes any 16-bit CP210X_ register (req) whose value is passed
690 * entirely in the wValue field of the USB request.
691 */
cp210x_write_u16_reg(struct usb_serial_port * port,u8 req,u16 val)692 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
693 {
694 struct usb_serial *serial = port->serial;
695 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
696 int result;
697
698 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
699 req, REQTYPE_HOST_TO_INTERFACE, val,
700 port_priv->bInterfaceNumber, NULL, 0,
701 USB_CTRL_SET_TIMEOUT);
702 if (result < 0) {
703 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
704 req, result);
705 }
706
707 return result;
708 }
709
710 /*
711 * Writes a variable-sized block of CP210X_ registers, identified by req.
712 * Data in buf must be in native USB byte order.
713 */
cp210x_write_reg_block(struct usb_serial_port * port,u8 req,void * buf,int bufsize)714 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
715 void *buf, int bufsize)
716 {
717 struct usb_serial *serial = port->serial;
718 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
719 int result;
720
721 result = usb_control_msg_send(serial->dev, 0, req,
722 REQTYPE_HOST_TO_INTERFACE, 0,
723 port_priv->bInterfaceNumber, buf, bufsize,
724 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
725 if (result) {
726 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
727 req, bufsize, result);
728 return result;
729 }
730
731 return 0;
732 }
733
734 /*
735 * Writes any 32-bit CP210X_ register identified by req.
736 */
cp210x_write_u32_reg(struct usb_serial_port * port,u8 req,u32 val)737 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
738 {
739 __le32 le32_val;
740
741 le32_val = cpu_to_le32(val);
742
743 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
744 }
745
746 #ifdef CONFIG_GPIOLIB
747 /*
748 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
749 * Data in buf must be in native USB byte order.
750 */
cp210x_write_vendor_block(struct usb_serial * serial,u8 type,u16 val,void * buf,int bufsize)751 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
752 u16 val, void *buf, int bufsize)
753 {
754 int result;
755
756 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
757 type, val, cp210x_interface_num(serial), buf, bufsize,
758 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
759 if (result) {
760 dev_err(&serial->interface->dev,
761 "failed to set vendor val 0x%04x size %d: %d\n", val,
762 bufsize, result);
763 return result;
764 }
765
766 return 0;
767 }
768 #endif
769
cp210x_open(struct tty_struct * tty,struct usb_serial_port * port)770 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
771 {
772 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
773 int result;
774
775 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
776 if (result) {
777 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
778 return result;
779 }
780
781 if (tty)
782 cp210x_set_termios(tty, port, NULL);
783
784 result = usb_serial_generic_open(tty, port);
785 if (result)
786 goto err_disable;
787
788 return 0;
789
790 err_disable:
791 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
792 port_priv->event_mode = false;
793
794 return result;
795 }
796
cp210x_close(struct usb_serial_port * port)797 static void cp210x_close(struct usb_serial_port *port)
798 {
799 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
800
801 usb_serial_generic_close(port);
802
803 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
804 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
805
806 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
807
808 /* Disabling the interface disables event-insertion mode. */
809 port_priv->event_mode = false;
810 }
811
cp210x_process_lsr(struct usb_serial_port * port,unsigned char lsr,char * flag)812 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
813 {
814 if (lsr & CP210X_LSR_BREAK) {
815 port->icount.brk++;
816 *flag = TTY_BREAK;
817 } else if (lsr & CP210X_LSR_PARITY) {
818 port->icount.parity++;
819 *flag = TTY_PARITY;
820 } else if (lsr & CP210X_LSR_FRAME) {
821 port->icount.frame++;
822 *flag = TTY_FRAME;
823 }
824
825 if (lsr & CP210X_LSR_OVERRUN) {
826 port->icount.overrun++;
827 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
828 }
829 }
830
cp210x_process_char(struct usb_serial_port * port,unsigned char * ch,char * flag)831 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
832 {
833 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
834
835 switch (port_priv->event_state) {
836 case ES_DATA:
837 if (*ch == CP210X_ESCCHAR) {
838 port_priv->event_state = ES_ESCAPE;
839 break;
840 }
841 return false;
842 case ES_ESCAPE:
843 switch (*ch) {
844 case 0:
845 dev_dbg(&port->dev, "%s - escape char\n", __func__);
846 *ch = CP210X_ESCCHAR;
847 port_priv->event_state = ES_DATA;
848 return false;
849 case 1:
850 port_priv->event_state = ES_LSR_DATA_0;
851 break;
852 case 2:
853 port_priv->event_state = ES_LSR;
854 break;
855 case 3:
856 port_priv->event_state = ES_MSR;
857 break;
858 default:
859 dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
860 port_priv->event_state = ES_DATA;
861 break;
862 }
863 break;
864 case ES_LSR_DATA_0:
865 port_priv->lsr = *ch;
866 port_priv->event_state = ES_LSR_DATA_1;
867 break;
868 case ES_LSR_DATA_1:
869 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
870 __func__, port_priv->lsr, *ch);
871 cp210x_process_lsr(port, port_priv->lsr, flag);
872 port_priv->event_state = ES_DATA;
873 return false;
874 case ES_LSR:
875 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
876 port_priv->lsr = *ch;
877 cp210x_process_lsr(port, port_priv->lsr, flag);
878 port_priv->event_state = ES_DATA;
879 break;
880 case ES_MSR:
881 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
882 /* unimplemented */
883 port_priv->event_state = ES_DATA;
884 break;
885 }
886
887 return true;
888 }
889
cp210x_process_read_urb(struct urb * urb)890 static void cp210x_process_read_urb(struct urb *urb)
891 {
892 struct usb_serial_port *port = urb->context;
893 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
894 unsigned char *ch = urb->transfer_buffer;
895 char flag;
896 int i;
897
898 if (!urb->actual_length)
899 return;
900
901 if (port_priv->event_mode) {
902 for (i = 0; i < urb->actual_length; i++, ch++) {
903 flag = TTY_NORMAL;
904
905 if (cp210x_process_char(port, ch, &flag))
906 continue;
907
908 tty_insert_flip_char(&port->port, *ch, flag);
909 }
910 } else {
911 tty_insert_flip_string(&port->port, ch, urb->actual_length);
912 }
913 tty_flip_buffer_push(&port->port);
914 }
915
916 /*
917 * Read how many bytes are waiting in the TX queue.
918 */
cp210x_get_tx_queue_byte_count(struct usb_serial_port * port,u32 * count)919 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
920 u32 *count)
921 {
922 struct usb_serial *serial = port->serial;
923 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
924 struct cp210x_comm_status sts;
925 int result;
926
927 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
928 REQTYPE_INTERFACE_TO_HOST, 0,
929 port_priv->bInterfaceNumber, &sts, sizeof(sts),
930 USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
931 if (result) {
932 dev_err(&port->dev, "failed to get comm status: %d\n", result);
933 return result;
934 }
935
936 *count = le32_to_cpu(sts.ulAmountInOutQueue);
937
938 return 0;
939 }
940
cp210x_tx_empty(struct usb_serial_port * port)941 static bool cp210x_tx_empty(struct usb_serial_port *port)
942 {
943 int err;
944 u32 count;
945
946 err = cp210x_get_tx_queue_byte_count(port, &count);
947 if (err)
948 return true;
949
950 return !count;
951 }
952
953 struct cp210x_rate {
954 speed_t rate;
955 speed_t high;
956 };
957
958 static const struct cp210x_rate cp210x_an205_table1[] = {
959 { 300, 300 },
960 { 600, 600 },
961 { 1200, 1200 },
962 { 1800, 1800 },
963 { 2400, 2400 },
964 { 4000, 4000 },
965 { 4800, 4803 },
966 { 7200, 7207 },
967 { 9600, 9612 },
968 { 14400, 14428 },
969 { 16000, 16062 },
970 { 19200, 19250 },
971 { 28800, 28912 },
972 { 38400, 38601 },
973 { 51200, 51558 },
974 { 56000, 56280 },
975 { 57600, 58053 },
976 { 64000, 64111 },
977 { 76800, 77608 },
978 { 115200, 117028 },
979 { 128000, 129347 },
980 { 153600, 156868 },
981 { 230400, 237832 },
982 { 250000, 254234 },
983 { 256000, 273066 },
984 { 460800, 491520 },
985 { 500000, 567138 },
986 { 576000, 670254 },
987 { 921600, UINT_MAX }
988 };
989
990 /*
991 * Quantises the baud rate as per AN205 Table 1
992 */
cp210x_get_an205_rate(speed_t baud)993 static speed_t cp210x_get_an205_rate(speed_t baud)
994 {
995 int i;
996
997 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
998 if (baud <= cp210x_an205_table1[i].high)
999 break;
1000 }
1001
1002 return cp210x_an205_table1[i].rate;
1003 }
1004
cp210x_get_actual_rate(speed_t baud)1005 static speed_t cp210x_get_actual_rate(speed_t baud)
1006 {
1007 unsigned int prescale = 1;
1008 unsigned int div;
1009
1010 if (baud <= 365)
1011 prescale = 4;
1012
1013 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1014 baud = 48000000 / (2 * prescale * div);
1015
1016 return baud;
1017 }
1018
1019 /*
1020 * CP2101 supports the following baud rates:
1021 *
1022 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1023 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1024 *
1025 * CP2102 and CP2103 support the following additional rates:
1026 *
1027 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1028 * 576000
1029 *
1030 * The device will map a requested rate to a supported one, but the result
1031 * of requests for rates greater than 1053257 is undefined (see AN205).
1032 *
1033 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1034 * respectively, with an error less than 1%. The actual rates are determined
1035 * by
1036 *
1037 * div = round(freq / (2 x prescale x request))
1038 * actual = freq / (2 x prescale x div)
1039 *
1040 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1041 * or 1 otherwise.
1042 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1043 * otherwise.
1044 */
cp210x_change_speed(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)1045 static void cp210x_change_speed(struct tty_struct *tty,
1046 struct usb_serial_port *port,
1047 const struct ktermios *old_termios)
1048 {
1049 struct usb_serial *serial = port->serial;
1050 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1051 u32 baud;
1052
1053 /*
1054 * This maps the requested rate to the actual rate, a valid rate on
1055 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1056 *
1057 * NOTE: B0 is not implemented.
1058 */
1059 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1060
1061 if (priv->use_actual_rate)
1062 baud = cp210x_get_actual_rate(baud);
1063 else if (baud < 1000000)
1064 baud = cp210x_get_an205_rate(baud);
1065
1066 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1067 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1068 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1069 if (old_termios)
1070 baud = old_termios->c_ospeed;
1071 else
1072 baud = 9600;
1073 }
1074
1075 tty_encode_baud_rate(tty, baud, baud);
1076 }
1077
cp210x_enable_event_mode(struct usb_serial_port * port)1078 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1079 {
1080 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1081 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1082 int ret;
1083
1084 if (port_priv->event_mode)
1085 return;
1086
1087 if (priv->no_event_mode)
1088 return;
1089
1090 port_priv->event_state = ES_DATA;
1091 port_priv->event_mode = true;
1092
1093 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1094 if (ret) {
1095 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1096 port_priv->event_mode = false;
1097 }
1098 }
1099
cp210x_disable_event_mode(struct usb_serial_port * port)1100 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1101 {
1102 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1103 int ret;
1104
1105 if (!port_priv->event_mode)
1106 return;
1107
1108 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1109 if (ret) {
1110 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1111 return;
1112 }
1113
1114 port_priv->event_mode = false;
1115 }
1116
cp210x_termios_change(const struct ktermios * a,const struct ktermios * b)1117 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1118 {
1119 bool iflag_change, cc_change;
1120
1121 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1122 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1123 a->c_cc[VSTOP] != b->c_cc[VSTOP];
1124
1125 return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1126 }
1127
cp210x_set_flow_control(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)1128 static void cp210x_set_flow_control(struct tty_struct *tty,
1129 struct usb_serial_port *port,
1130 const struct ktermios *old_termios)
1131 {
1132 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1133 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1134 struct cp210x_special_chars chars;
1135 struct cp210x_flow_ctl flow_ctl;
1136 u32 flow_repl;
1137 u32 ctl_hs;
1138 bool crtscts;
1139 int ret;
1140
1141 /*
1142 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1143 * CP2102N_E104). Report back that flow control is not supported.
1144 */
1145 if (priv->no_flow_control) {
1146 tty->termios.c_cflag &= ~CRTSCTS;
1147 tty->termios.c_iflag &= ~(IXON | IXOFF);
1148 }
1149
1150 if (old_termios &&
1151 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1152 I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1153 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1154 START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1155 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1156 return;
1157 }
1158
1159 if (I_IXON(tty) || I_IXOFF(tty)) {
1160 memset(&chars, 0, sizeof(chars));
1161
1162 chars.bXonChar = START_CHAR(tty);
1163 chars.bXoffChar = STOP_CHAR(tty);
1164
1165 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1166 sizeof(chars));
1167 if (ret) {
1168 dev_err(&port->dev, "failed to set special chars: %d\n",
1169 ret);
1170 }
1171 }
1172
1173 mutex_lock(&port_priv->mutex);
1174
1175 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1176 sizeof(flow_ctl));
1177 if (ret)
1178 goto out_unlock;
1179
1180 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1181 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1182
1183 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1184 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1185 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1186 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1187 if (port_priv->dtr)
1188 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1189 else
1190 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1191
1192 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1193 if (C_CRTSCTS(tty)) {
1194 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1195 if (port_priv->rts)
1196 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1197 else
1198 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1199 crtscts = true;
1200 } else {
1201 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1202 if (port_priv->rts)
1203 flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1204 else
1205 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1206 crtscts = false;
1207 }
1208
1209 if (I_IXOFF(tty)) {
1210 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1211
1212 flow_ctl.ulXonLimit = cpu_to_le32(128);
1213 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1214 } else {
1215 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1216 }
1217
1218 if (I_IXON(tty))
1219 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1220 else
1221 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1222
1223 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1224 ctl_hs, flow_repl);
1225
1226 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1227 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1228
1229 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1230 sizeof(flow_ctl));
1231 if (ret)
1232 goto out_unlock;
1233
1234 port_priv->crtscts = crtscts;
1235 out_unlock:
1236 mutex_unlock(&port_priv->mutex);
1237 }
1238
cp210x_set_termios(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)1239 static void cp210x_set_termios(struct tty_struct *tty,
1240 struct usb_serial_port *port,
1241 const struct ktermios *old_termios)
1242 {
1243 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1244 u16 bits;
1245 int ret;
1246
1247 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios))
1248 return;
1249
1250 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1251 cp210x_change_speed(tty, port, old_termios);
1252
1253 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1254 if (priv->partnum == CP210X_PARTNUM_CP2101) {
1255 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1256 tty->termios.c_cflag |= CS8;
1257 }
1258
1259 bits = 0;
1260
1261 switch (C_CSIZE(tty)) {
1262 case CS5:
1263 bits |= BITS_DATA_5;
1264 break;
1265 case CS6:
1266 bits |= BITS_DATA_6;
1267 break;
1268 case CS7:
1269 bits |= BITS_DATA_7;
1270 break;
1271 case CS8:
1272 default:
1273 bits |= BITS_DATA_8;
1274 break;
1275 }
1276
1277 if (C_PARENB(tty)) {
1278 if (C_CMSPAR(tty)) {
1279 if (C_PARODD(tty))
1280 bits |= BITS_PARITY_MARK;
1281 else
1282 bits |= BITS_PARITY_SPACE;
1283 } else {
1284 if (C_PARODD(tty))
1285 bits |= BITS_PARITY_ODD;
1286 else
1287 bits |= BITS_PARITY_EVEN;
1288 }
1289 }
1290
1291 if (C_CSTOPB(tty))
1292 bits |= BITS_STOP_2;
1293 else
1294 bits |= BITS_STOP_1;
1295
1296 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1297 if (ret)
1298 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1299
1300 cp210x_set_flow_control(tty, port, old_termios);
1301
1302 /*
1303 * Enable event-insertion mode only if input parity checking is
1304 * enabled for now.
1305 */
1306 if (I_INPCK(tty))
1307 cp210x_enable_event_mode(port);
1308 else
1309 cp210x_disable_event_mode(port);
1310 }
1311
cp210x_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1312 static int cp210x_tiocmset(struct tty_struct *tty,
1313 unsigned int set, unsigned int clear)
1314 {
1315 struct usb_serial_port *port = tty->driver_data;
1316 return cp210x_tiocmset_port(port, set, clear);
1317 }
1318
cp210x_tiocmset_port(struct usb_serial_port * port,unsigned int set,unsigned int clear)1319 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1320 unsigned int set, unsigned int clear)
1321 {
1322 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1323 struct cp210x_flow_ctl flow_ctl;
1324 u32 ctl_hs, flow_repl;
1325 u16 control = 0;
1326 int ret;
1327
1328 mutex_lock(&port_priv->mutex);
1329
1330 if (set & TIOCM_RTS) {
1331 port_priv->rts = true;
1332 control |= CONTROL_RTS;
1333 control |= CONTROL_WRITE_RTS;
1334 }
1335 if (set & TIOCM_DTR) {
1336 port_priv->dtr = true;
1337 control |= CONTROL_DTR;
1338 control |= CONTROL_WRITE_DTR;
1339 }
1340 if (clear & TIOCM_RTS) {
1341 port_priv->rts = false;
1342 control &= ~CONTROL_RTS;
1343 control |= CONTROL_WRITE_RTS;
1344 }
1345 if (clear & TIOCM_DTR) {
1346 port_priv->dtr = false;
1347 control &= ~CONTROL_DTR;
1348 control |= CONTROL_WRITE_DTR;
1349 }
1350
1351 /*
1352 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1353 * flow control is enabled.
1354 */
1355 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1356 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1357 sizeof(flow_ctl));
1358 if (ret)
1359 goto out_unlock;
1360
1361 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1362 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1363
1364 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1365 if (port_priv->dtr)
1366 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1367 else
1368 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1369
1370 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1371 if (port_priv->rts)
1372 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1373 else
1374 flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1375
1376 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1377 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1378
1379 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1380 __func__, ctl_hs, flow_repl);
1381
1382 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1383 sizeof(flow_ctl));
1384 } else {
1385 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1386
1387 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1388 }
1389 out_unlock:
1390 mutex_unlock(&port_priv->mutex);
1391
1392 return ret;
1393 }
1394
cp210x_dtr_rts(struct usb_serial_port * port,int on)1395 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1396 {
1397 if (on)
1398 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1399 else
1400 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1401 }
1402
cp210x_tiocmget(struct tty_struct * tty)1403 static int cp210x_tiocmget(struct tty_struct *tty)
1404 {
1405 struct usb_serial_port *port = tty->driver_data;
1406 u8 control;
1407 int result;
1408
1409 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1410 if (result)
1411 return result;
1412
1413 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1414 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1415 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1416 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1417 |((control & CONTROL_RING)? TIOCM_RI : 0)
1418 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1419
1420 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1421
1422 return result;
1423 }
1424
cp210x_break_ctl(struct tty_struct * tty,int break_state)1425 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1426 {
1427 struct usb_serial_port *port = tty->driver_data;
1428 u16 state;
1429
1430 if (break_state == 0)
1431 state = BREAK_OFF;
1432 else
1433 state = BREAK_ON;
1434 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1435 state == BREAK_OFF ? "off" : "on");
1436 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1437 }
1438
1439 #ifdef CONFIG_GPIOLIB
cp210x_gpio_get(struct gpio_chip * gc,unsigned int gpio)1440 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1441 {
1442 struct usb_serial *serial = gpiochip_get_data(gc);
1443 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1444 u8 req_type;
1445 u16 mask;
1446 int result;
1447 int len;
1448
1449 result = usb_autopm_get_interface(serial->interface);
1450 if (result)
1451 return result;
1452
1453 switch (priv->partnum) {
1454 case CP210X_PARTNUM_CP2105:
1455 req_type = REQTYPE_INTERFACE_TO_HOST;
1456 len = 1;
1457 break;
1458 case CP210X_PARTNUM_CP2108:
1459 req_type = REQTYPE_INTERFACE_TO_HOST;
1460 len = 2;
1461 break;
1462 default:
1463 req_type = REQTYPE_DEVICE_TO_HOST;
1464 len = 1;
1465 break;
1466 }
1467
1468 mask = 0;
1469 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1470 &mask, len);
1471
1472 usb_autopm_put_interface(serial->interface);
1473
1474 if (result < 0)
1475 return result;
1476
1477 le16_to_cpus(&mask);
1478
1479 return !!(mask & BIT(gpio));
1480 }
1481
cp210x_gpio_set(struct gpio_chip * gc,unsigned int gpio,int value)1482 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1483 {
1484 struct usb_serial *serial = gpiochip_get_data(gc);
1485 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1486 struct cp210x_gpio_write16 buf16;
1487 struct cp210x_gpio_write buf;
1488 u16 mask, state;
1489 u16 wIndex;
1490 int result;
1491
1492 if (value == 1)
1493 state = BIT(gpio);
1494 else
1495 state = 0;
1496
1497 mask = BIT(gpio);
1498
1499 result = usb_autopm_get_interface(serial->interface);
1500 if (result)
1501 goto out;
1502
1503 switch (priv->partnum) {
1504 case CP210X_PARTNUM_CP2105:
1505 buf.mask = (u8)mask;
1506 buf.state = (u8)state;
1507 result = cp210x_write_vendor_block(serial,
1508 REQTYPE_HOST_TO_INTERFACE,
1509 CP210X_WRITE_LATCH, &buf,
1510 sizeof(buf));
1511 break;
1512 case CP210X_PARTNUM_CP2108:
1513 buf16.mask = cpu_to_le16(mask);
1514 buf16.state = cpu_to_le16(state);
1515 result = cp210x_write_vendor_block(serial,
1516 REQTYPE_HOST_TO_INTERFACE,
1517 CP210X_WRITE_LATCH, &buf16,
1518 sizeof(buf16));
1519 break;
1520 default:
1521 wIndex = state << 8 | mask;
1522 result = usb_control_msg(serial->dev,
1523 usb_sndctrlpipe(serial->dev, 0),
1524 CP210X_VENDOR_SPECIFIC,
1525 REQTYPE_HOST_TO_DEVICE,
1526 CP210X_WRITE_LATCH,
1527 wIndex,
1528 NULL, 0, USB_CTRL_SET_TIMEOUT);
1529 break;
1530 }
1531
1532 usb_autopm_put_interface(serial->interface);
1533 out:
1534 if (result < 0) {
1535 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1536 result);
1537 }
1538 }
1539
cp210x_gpio_direction_get(struct gpio_chip * gc,unsigned int gpio)1540 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1541 {
1542 struct usb_serial *serial = gpiochip_get_data(gc);
1543 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1544
1545 return priv->gpio_input & BIT(gpio);
1546 }
1547
cp210x_gpio_direction_input(struct gpio_chip * gc,unsigned int gpio)1548 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1549 {
1550 struct usb_serial *serial = gpiochip_get_data(gc);
1551 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1552
1553 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1554 /* hardware does not support an input mode */
1555 return -ENOTSUPP;
1556 }
1557
1558 /* push-pull pins cannot be changed to be inputs */
1559 if (priv->gpio_pushpull & BIT(gpio))
1560 return -EINVAL;
1561
1562 /* make sure to release pin if it is being driven low */
1563 cp210x_gpio_set(gc, gpio, 1);
1564
1565 priv->gpio_input |= BIT(gpio);
1566
1567 return 0;
1568 }
1569
cp210x_gpio_direction_output(struct gpio_chip * gc,unsigned int gpio,int value)1570 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1571 int value)
1572 {
1573 struct usb_serial *serial = gpiochip_get_data(gc);
1574 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1575
1576 priv->gpio_input &= ~BIT(gpio);
1577 cp210x_gpio_set(gc, gpio, value);
1578
1579 return 0;
1580 }
1581
cp210x_gpio_set_config(struct gpio_chip * gc,unsigned int gpio,unsigned long config)1582 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1583 unsigned long config)
1584 {
1585 struct usb_serial *serial = gpiochip_get_data(gc);
1586 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1587 enum pin_config_param param = pinconf_to_config_param(config);
1588
1589 /* Succeed only if in correct mode (this can't be set at runtime) */
1590 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1591 (priv->gpio_pushpull & BIT(gpio)))
1592 return 0;
1593
1594 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1595 !(priv->gpio_pushpull & BIT(gpio)))
1596 return 0;
1597
1598 return -ENOTSUPP;
1599 }
1600
cp210x_gpio_init_valid_mask(struct gpio_chip * gc,unsigned long * valid_mask,unsigned int ngpios)1601 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1602 unsigned long *valid_mask, unsigned int ngpios)
1603 {
1604 struct usb_serial *serial = gpiochip_get_data(gc);
1605 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1606 struct device *dev = &serial->interface->dev;
1607 unsigned long altfunc_mask = priv->gpio_altfunc;
1608
1609 bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1610
1611 if (bitmap_empty(valid_mask, ngpios))
1612 dev_dbg(dev, "no pin configured for GPIO\n");
1613 else
1614 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1615 valid_mask);
1616 return 0;
1617 }
1618
1619 /*
1620 * This function is for configuring GPIO using shared pins, where other signals
1621 * are made unavailable by configuring the use of GPIO. This is believed to be
1622 * only applicable to the cp2105 at this point, the other devices supported by
1623 * this driver that provide GPIO do so in a way that does not impact other
1624 * signals and are thus expected to have very different initialisation.
1625 */
cp2105_gpioconf_init(struct usb_serial * serial)1626 static int cp2105_gpioconf_init(struct usb_serial *serial)
1627 {
1628 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1629 struct cp210x_pin_mode mode;
1630 struct cp210x_dual_port_config config;
1631 u8 intf_num = cp210x_interface_num(serial);
1632 u8 iface_config;
1633 int result;
1634
1635 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1636 CP210X_GET_DEVICEMODE, &mode,
1637 sizeof(mode));
1638 if (result < 0)
1639 return result;
1640
1641 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1642 CP210X_GET_PORTCONFIG, &config,
1643 sizeof(config));
1644 if (result < 0)
1645 return result;
1646
1647 /* 2 banks of GPIO - One for the pins taken from each serial port */
1648 if (intf_num == 0) {
1649 priv->gc.ngpio = 2;
1650
1651 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1652 /* mark all GPIOs of this interface as reserved */
1653 priv->gpio_altfunc = 0xff;
1654 return 0;
1655 }
1656
1657 iface_config = config.eci_cfg;
1658 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1659 CP210X_ECI_GPIO_MODE_MASK) >>
1660 CP210X_ECI_GPIO_MODE_OFFSET);
1661 } else if (intf_num == 1) {
1662 priv->gc.ngpio = 3;
1663
1664 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1665 /* mark all GPIOs of this interface as reserved */
1666 priv->gpio_altfunc = 0xff;
1667 return 0;
1668 }
1669
1670 iface_config = config.sci_cfg;
1671 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1672 CP210X_SCI_GPIO_MODE_MASK) >>
1673 CP210X_SCI_GPIO_MODE_OFFSET);
1674 } else {
1675 return -ENODEV;
1676 }
1677
1678 /* mark all pins which are not in GPIO mode */
1679 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
1680 priv->gpio_altfunc |= BIT(0);
1681 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
1682 CP2105_GPIO1_RS485_MODE))
1683 priv->gpio_altfunc |= BIT(1);
1684
1685 /* driver implementation for CP2105 only supports outputs */
1686 priv->gpio_input = 0;
1687
1688 return 0;
1689 }
1690
cp2104_gpioconf_init(struct usb_serial * serial)1691 static int cp2104_gpioconf_init(struct usb_serial *serial)
1692 {
1693 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1694 struct cp210x_single_port_config config;
1695 u8 iface_config;
1696 u8 gpio_latch;
1697 int result;
1698 u8 i;
1699
1700 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1701 CP210X_GET_PORTCONFIG, &config,
1702 sizeof(config));
1703 if (result < 0)
1704 return result;
1705
1706 priv->gc.ngpio = 4;
1707
1708 iface_config = config.device_cfg;
1709 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1710 CP210X_GPIO_MODE_MASK) >>
1711 CP210X_GPIO_MODE_OFFSET);
1712 gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1713 CP210X_GPIO_MODE_MASK) >>
1714 CP210X_GPIO_MODE_OFFSET);
1715
1716 /* mark all pins which are not in GPIO mode */
1717 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
1718 priv->gpio_altfunc |= BIT(0);
1719 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
1720 priv->gpio_altfunc |= BIT(1);
1721 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
1722 priv->gpio_altfunc |= BIT(2);
1723
1724 /*
1725 * Like CP2102N, CP2104 has also no strict input and output pin
1726 * modes.
1727 * Do the same input mode emulation as CP2102N.
1728 */
1729 for (i = 0; i < priv->gc.ngpio; ++i) {
1730 /*
1731 * Set direction to "input" iff pin is open-drain and reset
1732 * value is 1.
1733 */
1734 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1735 priv->gpio_input |= BIT(i);
1736 }
1737
1738 return 0;
1739 }
1740
cp2108_gpio_init(struct usb_serial * serial)1741 static int cp2108_gpio_init(struct usb_serial *serial)
1742 {
1743 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1744 struct cp210x_quad_port_config config;
1745 u16 gpio_latch;
1746 int result;
1747 u8 i;
1748
1749 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1750 CP210X_GET_PORTCONFIG, &config,
1751 sizeof(config));
1752 if (result < 0)
1753 return result;
1754
1755 priv->gc.ngpio = 16;
1756 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1757 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1758
1759 /*
1760 * Mark all pins which are not in GPIO mode.
1761 *
1762 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1763 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1764 *
1765 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1766 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1767 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1768 */
1769 for (i = 0; i < 4; i++) {
1770 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1771 priv->gpio_altfunc |= BIT(i * 4);
1772 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1773 priv->gpio_altfunc |= BIT((i * 4) + 1);
1774 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1775 priv->gpio_altfunc |= BIT((i * 4) + 2);
1776 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1777 priv->gpio_altfunc |= BIT((i * 4) + 3);
1778 }
1779
1780 /*
1781 * Like CP2102N, CP2108 has also no strict input and output pin
1782 * modes. Do the same input mode emulation as CP2102N.
1783 */
1784 for (i = 0; i < priv->gc.ngpio; ++i) {
1785 /*
1786 * Set direction to "input" iff pin is open-drain and reset
1787 * value is 1.
1788 */
1789 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1790 priv->gpio_input |= BIT(i);
1791 }
1792
1793 return 0;
1794 }
1795
cp2102n_gpioconf_init(struct usb_serial * serial)1796 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1797 {
1798 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1799 const u16 config_size = 0x02a6;
1800 u8 gpio_rst_latch;
1801 u8 config_version;
1802 u8 gpio_pushpull;
1803 u8 *config_buf;
1804 u8 gpio_latch;
1805 u8 gpio_ctrl;
1806 int result;
1807 u8 i;
1808
1809 /*
1810 * Retrieve device configuration from the device.
1811 * The array received contains all customization settings done at the
1812 * factory/manufacturer. Format of the array is documented at the
1813 * time of writing at:
1814 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1815 */
1816 config_buf = kmalloc(config_size, GFP_KERNEL);
1817 if (!config_buf)
1818 return -ENOMEM;
1819
1820 result = cp210x_read_vendor_block(serial,
1821 REQTYPE_DEVICE_TO_HOST,
1822 CP210X_READ_2NCONFIG,
1823 config_buf,
1824 config_size);
1825 if (result < 0) {
1826 kfree(config_buf);
1827 return result;
1828 }
1829
1830 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1831 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1832 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1833 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1834
1835 kfree(config_buf);
1836
1837 /* Make sure this is a config format we understand. */
1838 if (config_version != 0x01)
1839 return -ENOTSUPP;
1840
1841 priv->gc.ngpio = 4;
1842
1843 /*
1844 * Get default pin states after reset. Needed so we can determine
1845 * the direction of an open-drain pin.
1846 */
1847 gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1848
1849 /* 0 indicates open-drain mode, 1 is push-pull */
1850 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1851
1852 /* 0 indicates GPIO mode, 1 is alternate function */
1853 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1854 /* QFN20 is special... */
1855 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */
1856 priv->gpio_altfunc |= BIT(0);
1857 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1858 priv->gpio_altfunc |= BIT(1);
1859 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1860 priv->gpio_altfunc |= BIT(2);
1861 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1862 priv->gpio_altfunc |= BIT(3);
1863 } else {
1864 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1865 }
1866
1867 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1868 /*
1869 * For the QFN28 package, GPIO4-6 are controlled by
1870 * the low three bits of the mode/latch fields.
1871 * Contrary to the document linked above, the bits for
1872 * the SUSPEND pins are elsewhere. No alternate
1873 * function is available for these pins.
1874 */
1875 priv->gc.ngpio = 7;
1876 gpio_latch |= (gpio_rst_latch & 7) << 4;
1877 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1878 }
1879
1880 /*
1881 * The CP2102N does not strictly has input and output pin modes,
1882 * it only knows open-drain and push-pull modes which is set at
1883 * factory. An open-drain pin can function both as an
1884 * input or an output. We emulate input mode for open-drain pins
1885 * by making sure they are not driven low, and we do not allow
1886 * push-pull pins to be set as an input.
1887 */
1888 for (i = 0; i < priv->gc.ngpio; ++i) {
1889 /*
1890 * Set direction to "input" iff pin is open-drain and reset
1891 * value is 1.
1892 */
1893 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1894 priv->gpio_input |= BIT(i);
1895 }
1896
1897 return 0;
1898 }
1899
cp210x_gpio_init(struct usb_serial * serial)1900 static int cp210x_gpio_init(struct usb_serial *serial)
1901 {
1902 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1903 int result;
1904
1905 switch (priv->partnum) {
1906 case CP210X_PARTNUM_CP2104:
1907 result = cp2104_gpioconf_init(serial);
1908 break;
1909 case CP210X_PARTNUM_CP2105:
1910 result = cp2105_gpioconf_init(serial);
1911 break;
1912 case CP210X_PARTNUM_CP2108:
1913 /*
1914 * The GPIOs are not tied to any specific port so only register
1915 * once for interface 0.
1916 */
1917 if (cp210x_interface_num(serial) != 0)
1918 return 0;
1919 result = cp2108_gpio_init(serial);
1920 break;
1921 case CP210X_PARTNUM_CP2102N_QFN28:
1922 case CP210X_PARTNUM_CP2102N_QFN24:
1923 case CP210X_PARTNUM_CP2102N_QFN20:
1924 result = cp2102n_gpioconf_init(serial);
1925 break;
1926 default:
1927 return 0;
1928 }
1929
1930 if (result < 0)
1931 return result;
1932
1933 priv->gc.label = "cp210x";
1934 priv->gc.get_direction = cp210x_gpio_direction_get;
1935 priv->gc.direction_input = cp210x_gpio_direction_input;
1936 priv->gc.direction_output = cp210x_gpio_direction_output;
1937 priv->gc.get = cp210x_gpio_get;
1938 priv->gc.set = cp210x_gpio_set;
1939 priv->gc.set_config = cp210x_gpio_set_config;
1940 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1941 priv->gc.owner = THIS_MODULE;
1942 priv->gc.parent = &serial->interface->dev;
1943 priv->gc.base = -1;
1944 priv->gc.can_sleep = true;
1945
1946 result = gpiochip_add_data(&priv->gc, serial);
1947 if (!result)
1948 priv->gpio_registered = true;
1949
1950 return result;
1951 }
1952
cp210x_gpio_remove(struct usb_serial * serial)1953 static void cp210x_gpio_remove(struct usb_serial *serial)
1954 {
1955 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1956
1957 if (priv->gpio_registered) {
1958 gpiochip_remove(&priv->gc);
1959 priv->gpio_registered = false;
1960 }
1961 }
1962
1963 #else
1964
cp210x_gpio_init(struct usb_serial * serial)1965 static int cp210x_gpio_init(struct usb_serial *serial)
1966 {
1967 return 0;
1968 }
1969
cp210x_gpio_remove(struct usb_serial * serial)1970 static void cp210x_gpio_remove(struct usb_serial *serial)
1971 {
1972 /* Nothing to do */
1973 }
1974
1975 #endif
1976
cp210x_port_probe(struct usb_serial_port * port)1977 static int cp210x_port_probe(struct usb_serial_port *port)
1978 {
1979 struct usb_serial *serial = port->serial;
1980 struct cp210x_port_private *port_priv;
1981
1982 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1983 if (!port_priv)
1984 return -ENOMEM;
1985
1986 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1987 mutex_init(&port_priv->mutex);
1988
1989 usb_set_serial_port_data(port, port_priv);
1990
1991 return 0;
1992 }
1993
cp210x_port_remove(struct usb_serial_port * port)1994 static void cp210x_port_remove(struct usb_serial_port *port)
1995 {
1996 struct cp210x_port_private *port_priv;
1997
1998 port_priv = usb_get_serial_port_data(port);
1999 kfree(port_priv);
2000 }
2001
cp210x_init_max_speed(struct usb_serial * serial)2002 static void cp210x_init_max_speed(struct usb_serial *serial)
2003 {
2004 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2005 bool use_actual_rate = false;
2006 speed_t min = 300;
2007 speed_t max;
2008
2009 switch (priv->partnum) {
2010 case CP210X_PARTNUM_CP2101:
2011 max = 921600;
2012 break;
2013 case CP210X_PARTNUM_CP2102:
2014 case CP210X_PARTNUM_CP2103:
2015 max = 1000000;
2016 break;
2017 case CP210X_PARTNUM_CP2104:
2018 use_actual_rate = true;
2019 max = 2000000;
2020 break;
2021 case CP210X_PARTNUM_CP2108:
2022 max = 2000000;
2023 break;
2024 case CP210X_PARTNUM_CP2105:
2025 if (cp210x_interface_num(serial) == 0) {
2026 use_actual_rate = true;
2027 max = 2000000; /* ECI */
2028 } else {
2029 min = 2400;
2030 max = 921600; /* SCI */
2031 }
2032 break;
2033 case CP210X_PARTNUM_CP2102N_QFN28:
2034 case CP210X_PARTNUM_CP2102N_QFN24:
2035 case CP210X_PARTNUM_CP2102N_QFN20:
2036 use_actual_rate = true;
2037 max = 3000000;
2038 break;
2039 default:
2040 max = 2000000;
2041 break;
2042 }
2043
2044 priv->min_speed = min;
2045 priv->max_speed = max;
2046 priv->use_actual_rate = use_actual_rate;
2047 }
2048
cp2102_determine_quirks(struct usb_serial * serial)2049 static void cp2102_determine_quirks(struct usb_serial *serial)
2050 {
2051 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2052 u8 *buf;
2053 int ret;
2054
2055 buf = kmalloc(2, GFP_KERNEL);
2056 if (!buf)
2057 return;
2058 /*
2059 * Some (possibly counterfeit) CP2102 do not support event-insertion
2060 * mode and respond differently to malformed vendor requests.
2061 * Specifically, they return one instead of two bytes when sent a
2062 * two-byte part-number request.
2063 */
2064 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2065 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2066 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2067 if (ret == 1) {
2068 dev_dbg(&serial->interface->dev,
2069 "device does not support event-insertion mode\n");
2070 priv->no_event_mode = true;
2071 }
2072
2073 kfree(buf);
2074 }
2075
cp210x_get_fw_version(struct usb_serial * serial,u16 value)2076 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2077 {
2078 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2079 u8 ver[3];
2080 int ret;
2081
2082 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2083 ver, sizeof(ver));
2084 if (ret)
2085 return ret;
2086
2087 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2088 ver[0], ver[1], ver[2]);
2089
2090 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2091
2092 return 0;
2093 }
2094
cp210x_determine_type(struct usb_serial * serial)2095 static void cp210x_determine_type(struct usb_serial *serial)
2096 {
2097 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2098 int ret;
2099
2100 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2101 CP210X_GET_PARTNUM, &priv->partnum,
2102 sizeof(priv->partnum));
2103 if (ret < 0) {
2104 dev_warn(&serial->interface->dev,
2105 "querying part number failed\n");
2106 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2107 return;
2108 }
2109
2110 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2111
2112 switch (priv->partnum) {
2113 case CP210X_PARTNUM_CP2102:
2114 cp2102_determine_quirks(serial);
2115 break;
2116 case CP210X_PARTNUM_CP2105:
2117 case CP210X_PARTNUM_CP2108:
2118 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2119 break;
2120 case CP210X_PARTNUM_CP2102N_QFN28:
2121 case CP210X_PARTNUM_CP2102N_QFN24:
2122 case CP210X_PARTNUM_CP2102N_QFN20:
2123 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2124 if (ret)
2125 break;
2126 if (priv->fw_version <= 0x10004)
2127 priv->no_flow_control = true;
2128 break;
2129 default:
2130 break;
2131 }
2132 }
2133
cp210x_attach(struct usb_serial * serial)2134 static int cp210x_attach(struct usb_serial *serial)
2135 {
2136 int result;
2137 struct cp210x_serial_private *priv;
2138
2139 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2140 if (!priv)
2141 return -ENOMEM;
2142
2143 usb_set_serial_data(serial, priv);
2144
2145 cp210x_determine_type(serial);
2146 cp210x_init_max_speed(serial);
2147
2148 result = cp210x_gpio_init(serial);
2149 if (result < 0) {
2150 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2151 result);
2152 }
2153
2154 return 0;
2155 }
2156
cp210x_disconnect(struct usb_serial * serial)2157 static void cp210x_disconnect(struct usb_serial *serial)
2158 {
2159 cp210x_gpio_remove(serial);
2160 }
2161
cp210x_release(struct usb_serial * serial)2162 static void cp210x_release(struct usb_serial *serial)
2163 {
2164 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2165
2166 cp210x_gpio_remove(serial);
2167
2168 kfree(priv);
2169 }
2170
2171 module_usb_serial_driver(serial_drivers, id_table);
2172
2173 MODULE_DESCRIPTION(DRIVER_DESC);
2174 MODULE_LICENSE("GPL v2");
2175