1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * w83793.c - Linux kernel driver for hardware monitoring
4  * Copyright (C) 2006 Winbond Electronics Corp.
5  *	      Yuan Mu
6  *	      Rudolf Marek <r.marek@assembler.cz>
7  * Copyright (C) 2009-2010 Sven Anders <anders@anduras.de>, ANDURAS AG.
8  *		Watchdog driver part
9  *		(Based partially on fschmd driver,
10  *		 Copyright 2007-2008 by Hans de Goede)
11  */
12 
13 /*
14  * Supports following chips:
15  *
16  * Chip	#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA
17  * w83793	10	12	8	6	0x7b	0x5ca3	yes	no
18  */
19 
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/slab.h>
23 #include <linux/i2c.h>
24 #include <linux/hwmon.h>
25 #include <linux/hwmon-vid.h>
26 #include <linux/hwmon-sysfs.h>
27 #include <linux/err.h>
28 #include <linux/mutex.h>
29 #include <linux/fs.h>
30 #include <linux/watchdog.h>
31 #include <linux/miscdevice.h>
32 #include <linux/uaccess.h>
33 #include <linux/kref.h>
34 #include <linux/notifier.h>
35 #include <linux/reboot.h>
36 #include <linux/jiffies.h>
37 
38 /* Default values */
39 #define WATCHDOG_TIMEOUT 2	/* 2 minute default timeout */
40 
41 /* Addresses to scan */
42 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
43 						I2C_CLIENT_END };
44 
45 /* Insmod parameters */
46 
47 static unsigned short force_subclients[4];
48 module_param_array(force_subclients, short, NULL, 0);
49 MODULE_PARM_DESC(force_subclients,
50 		 "List of subclient addresses: {bus, clientaddr, subclientaddr1, subclientaddr2}");
51 
52 static bool reset;
53 module_param(reset, bool, 0);
54 MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");
55 
56 static int timeout = WATCHDOG_TIMEOUT;	/* default timeout in minutes */
57 module_param(timeout, int, 0);
58 MODULE_PARM_DESC(timeout,
59 	"Watchdog timeout in minutes. 2<= timeout <=255 (default="
60 				__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
61 
62 static bool nowayout = WATCHDOG_NOWAYOUT;
63 module_param(nowayout, bool, 0);
64 MODULE_PARM_DESC(nowayout,
65 	"Watchdog cannot be stopped once started (default="
66 				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
67 
68 /*
69  * Address 0x00, 0x0d, 0x0e, 0x0f in all three banks are reserved
70  * as ID, Bank Select registers
71  */
72 #define W83793_REG_BANKSEL		0x00
73 #define W83793_REG_VENDORID		0x0d
74 #define W83793_REG_CHIPID		0x0e
75 #define W83793_REG_DEVICEID		0x0f
76 
77 #define W83793_REG_CONFIG		0x40
78 #define W83793_REG_MFC			0x58
79 #define W83793_REG_FANIN_CTRL		0x5c
80 #define W83793_REG_FANIN_SEL		0x5d
81 #define W83793_REG_I2C_ADDR		0x0b
82 #define W83793_REG_I2C_SUBADDR		0x0c
83 #define W83793_REG_VID_INA		0x05
84 #define W83793_REG_VID_INB		0x06
85 #define W83793_REG_VID_LATCHA		0x07
86 #define W83793_REG_VID_LATCHB		0x08
87 #define W83793_REG_VID_CTRL		0x59
88 
89 #define W83793_REG_WDT_LOCK		0x01
90 #define W83793_REG_WDT_ENABLE		0x02
91 #define W83793_REG_WDT_STATUS		0x03
92 #define W83793_REG_WDT_TIMEOUT		0x04
93 
94 static u16 W83793_REG_TEMP_MODE[2] = { 0x5e, 0x5f };
95 
96 #define TEMP_READ	0
97 #define TEMP_CRIT	1
98 #define TEMP_CRIT_HYST	2
99 #define TEMP_WARN	3
100 #define TEMP_WARN_HYST	4
101 /*
102  * only crit and crit_hyst affect real-time alarm status
103  * current crit crit_hyst warn warn_hyst
104  */
105 static u16 W83793_REG_TEMP[][5] = {
106 	{0x1c, 0x78, 0x79, 0x7a, 0x7b},
107 	{0x1d, 0x7c, 0x7d, 0x7e, 0x7f},
108 	{0x1e, 0x80, 0x81, 0x82, 0x83},
109 	{0x1f, 0x84, 0x85, 0x86, 0x87},
110 	{0x20, 0x88, 0x89, 0x8a, 0x8b},
111 	{0x21, 0x8c, 0x8d, 0x8e, 0x8f},
112 };
113 
114 #define W83793_REG_TEMP_LOW_BITS	0x22
115 
116 #define W83793_REG_BEEP(index)		(0x53 + (index))
117 #define W83793_REG_ALARM(index)		(0x4b + (index))
118 
119 #define W83793_REG_CLR_CHASSIS		0x4a	/* SMI MASK4 */
120 #define W83793_REG_IRQ_CTRL		0x50
121 #define W83793_REG_OVT_CTRL		0x51
122 #define W83793_REG_OVT_BEEP		0x52
123 
124 #define IN_READ				0
125 #define IN_MAX				1
126 #define IN_LOW				2
127 static const u16 W83793_REG_IN[][3] = {
128 	/* Current, High, Low */
129 	{0x10, 0x60, 0x61},	/* Vcore A	*/
130 	{0x11, 0x62, 0x63},	/* Vcore B	*/
131 	{0x12, 0x64, 0x65},	/* Vtt		*/
132 	{0x14, 0x6a, 0x6b},	/* VSEN1	*/
133 	{0x15, 0x6c, 0x6d},	/* VSEN2	*/
134 	{0x16, 0x6e, 0x6f},	/* +3VSEN	*/
135 	{0x17, 0x70, 0x71},	/* +12VSEN	*/
136 	{0x18, 0x72, 0x73},	/* 5VDD		*/
137 	{0x19, 0x74, 0x75},	/* 5VSB		*/
138 	{0x1a, 0x76, 0x77},	/* VBAT		*/
139 };
140 
141 /* Low Bits of Vcore A/B Vtt Read/High/Low */
142 static const u16 W83793_REG_IN_LOW_BITS[] = { 0x1b, 0x68, 0x69 };
143 static u8 scale_in[] = { 2, 2, 2, 16, 16, 16, 8, 24, 24, 16 };
144 static u8 scale_in_add[] = { 0, 0, 0, 0, 0, 0, 0, 150, 150, 0 };
145 
146 #define W83793_REG_FAN(index)		(0x23 + 2 * (index))	/* High byte */
147 #define W83793_REG_FAN_MIN(index)	(0x90 + 2 * (index))	/* High byte */
148 
149 #define W83793_REG_PWM_DEFAULT		0xb2
150 #define W83793_REG_PWM_ENABLE		0x207
151 #define W83793_REG_PWM_UPTIME		0xc3	/* Unit in 0.1 second */
152 #define W83793_REG_PWM_DOWNTIME		0xc4	/* Unit in 0.1 second */
153 #define W83793_REG_TEMP_CRITICAL	0xc5
154 
155 #define PWM_DUTY			0
156 #define PWM_START			1
157 #define PWM_NONSTOP			2
158 #define PWM_STOP_TIME			3
159 #define W83793_REG_PWM(index, nr)	(((nr) == 0 ? 0xb3 : \
160 					 (nr) == 1 ? 0x220 : 0x218) + (index))
161 
162 /* bit field, fan1 is bit0, fan2 is bit1 ... */
163 #define W83793_REG_TEMP_FAN_MAP(index)	(0x201 + (index))
164 #define W83793_REG_TEMP_TOL(index)	(0x208 + (index))
165 #define W83793_REG_TEMP_CRUISE(index)	(0x210 + (index))
166 #define W83793_REG_PWM_STOP_TIME(index)	(0x228 + (index))
167 #define W83793_REG_SF2_TEMP(index, nr)	(0x230 + ((index) << 4) + (nr))
168 #define W83793_REG_SF2_PWM(index, nr)	(0x238 + ((index) << 4) + (nr))
169 
FAN_FROM_REG(u16 val)170 static inline unsigned long FAN_FROM_REG(u16 val)
171 {
172 	if ((val >= 0xfff) || (val == 0))
173 		return	0;
174 	return 1350000UL / val;
175 }
176 
FAN_TO_REG(long rpm)177 static inline u16 FAN_TO_REG(long rpm)
178 {
179 	if (rpm <= 0)
180 		return 0x0fff;
181 	return clamp_val((1350000 + (rpm >> 1)) / rpm, 1, 0xffe);
182 }
183 
TIME_FROM_REG(u8 reg)184 static inline unsigned long TIME_FROM_REG(u8 reg)
185 {
186 	return reg * 100;
187 }
188 
TIME_TO_REG(unsigned long val)189 static inline u8 TIME_TO_REG(unsigned long val)
190 {
191 	return clamp_val((val + 50) / 100, 0, 0xff);
192 }
193 
TEMP_FROM_REG(s8 reg)194 static inline long TEMP_FROM_REG(s8 reg)
195 {
196 	return reg * 1000;
197 }
198 
TEMP_TO_REG(long val,s8 min,s8 max)199 static inline s8 TEMP_TO_REG(long val, s8 min, s8 max)
200 {
201 	return clamp_val((val + (val < 0 ? -500 : 500)) / 1000, min, max);
202 }
203 
204 struct w83793_data {
205 	struct device *hwmon_dev;
206 	struct mutex update_lock;
207 	bool valid;			/* true if following fields are valid */
208 	unsigned long last_updated;	/* In jiffies */
209 	unsigned long last_nonvolatile;	/* In jiffies, last time we update the
210 					 * nonvolatile registers
211 					 */
212 
213 	u8 bank;
214 	u8 vrm;
215 	u8 vid[2];
216 	u8 in[10][3];		/* Register value, read/high/low */
217 	u8 in_low_bits[3];	/* Additional resolution for VCore A/B Vtt */
218 
219 	u16 has_fan;		/* Only fan1- fan5 has own pins */
220 	u16 fan[12];		/* Register value combine */
221 	u16 fan_min[12];	/* Register value combine */
222 
223 	s8 temp[6][5];		/* current, crit, crit_hyst,warn, warn_hyst */
224 	u8 temp_low_bits;	/* Additional resolution TD1-TD4 */
225 	u8 temp_mode[2];	/* byte 0: Temp D1-D4 mode each has 2 bits
226 				 * byte 1: Temp R1,R2 mode, each has 1 bit
227 				 */
228 	u8 temp_critical;	/* If reached all fan will be at full speed */
229 	u8 temp_fan_map[6];	/* Temp controls which pwm fan, bit field */
230 
231 	u8 has_pwm;
232 	u8 has_temp;
233 	u8 has_vid;
234 	u8 pwm_enable;		/* Register value, each Temp has 1 bit */
235 	u8 pwm_uptime;		/* Register value */
236 	u8 pwm_downtime;	/* Register value */
237 	u8 pwm_default;		/* All fan default pwm, next poweron valid */
238 	u8 pwm[8][3];		/* Register value */
239 	u8 pwm_stop_time[8];
240 	u8 temp_cruise[6];
241 
242 	u8 alarms[5];		/* realtime status registers */
243 	u8 beeps[5];
244 	u8 beep_enable;
245 	u8 tolerance[3];	/* Temp tolerance(Smart Fan I/II) */
246 	u8 sf2_pwm[6][7];	/* Smart FanII: Fan duty cycle */
247 	u8 sf2_temp[6][7];	/* Smart FanII: Temp level point */
248 
249 	/* watchdog */
250 	struct i2c_client *client;
251 	struct mutex watchdog_lock;
252 	struct list_head list; /* member of the watchdog_data_list */
253 	struct kref kref;
254 	struct miscdevice watchdog_miscdev;
255 	unsigned long watchdog_is_open;
256 	char watchdog_expect_close;
257 	char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
258 	unsigned int watchdog_caused_reboot;
259 	int watchdog_timeout; /* watchdog timeout in minutes */
260 };
261 
262 /*
263  * Somewhat ugly :( global data pointer list with all devices, so that
264  * we can find our device data as when using misc_register. There is no
265  * other method to get to one's device data from the open file-op and
266  * for usage in the reboot notifier callback.
267  */
268 static LIST_HEAD(watchdog_data_list);
269 
270 /* Note this lock not only protect list access, but also data.kref access */
271 static DEFINE_MUTEX(watchdog_data_mutex);
272 
273 /*
274  * Release our data struct when we're detached from the i2c client *and* all
275  * references to our watchdog device are released
276  */
w83793_release_resources(struct kref * ref)277 static void w83793_release_resources(struct kref *ref)
278 {
279 	struct w83793_data *data = container_of(ref, struct w83793_data, kref);
280 	kfree(data);
281 }
282 
283 static u8 w83793_read_value(struct i2c_client *client, u16 reg);
284 static int w83793_write_value(struct i2c_client *client, u16 reg, u8 value);
285 static int w83793_probe(struct i2c_client *client);
286 static int w83793_detect(struct i2c_client *client,
287 			 struct i2c_board_info *info);
288 static int w83793_remove(struct i2c_client *client);
289 static void w83793_init_client(struct i2c_client *client);
290 static void w83793_update_nonvolatile(struct device *dev);
291 static struct w83793_data *w83793_update_device(struct device *dev);
292 
293 static const struct i2c_device_id w83793_id[] = {
294 	{ "w83793", 0 },
295 	{ }
296 };
297 MODULE_DEVICE_TABLE(i2c, w83793_id);
298 
299 static struct i2c_driver w83793_driver = {
300 	.class		= I2C_CLASS_HWMON,
301 	.driver = {
302 		   .name = "w83793",
303 	},
304 	.probe_new	= w83793_probe,
305 	.remove		= w83793_remove,
306 	.id_table	= w83793_id,
307 	.detect		= w83793_detect,
308 	.address_list	= normal_i2c,
309 };
310 
311 static ssize_t
vrm_show(struct device * dev,struct device_attribute * attr,char * buf)312 vrm_show(struct device *dev, struct device_attribute *attr, char *buf)
313 {
314 	struct w83793_data *data = dev_get_drvdata(dev);
315 	return sprintf(buf, "%d\n", data->vrm);
316 }
317 
318 static ssize_t
show_vid(struct device * dev,struct device_attribute * attr,char * buf)319 show_vid(struct device *dev, struct device_attribute *attr, char *buf)
320 {
321 	struct w83793_data *data = w83793_update_device(dev);
322 	struct sensor_device_attribute_2 *sensor_attr =
323 	    to_sensor_dev_attr_2(attr);
324 	int index = sensor_attr->index;
325 
326 	return sprintf(buf, "%d\n", vid_from_reg(data->vid[index], data->vrm));
327 }
328 
329 static ssize_t
vrm_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)330 vrm_store(struct device *dev, struct device_attribute *attr,
331 	  const char *buf, size_t count)
332 {
333 	struct w83793_data *data = dev_get_drvdata(dev);
334 	unsigned long val;
335 	int err;
336 
337 	err = kstrtoul(buf, 10, &val);
338 	if (err)
339 		return err;
340 
341 	if (val > 255)
342 		return -EINVAL;
343 
344 	data->vrm = val;
345 	return count;
346 }
347 
348 #define ALARM_STATUS			0
349 #define BEEP_ENABLE			1
350 static ssize_t
show_alarm_beep(struct device * dev,struct device_attribute * attr,char * buf)351 show_alarm_beep(struct device *dev, struct device_attribute *attr, char *buf)
352 {
353 	struct w83793_data *data = w83793_update_device(dev);
354 	struct sensor_device_attribute_2 *sensor_attr =
355 	    to_sensor_dev_attr_2(attr);
356 	int nr = sensor_attr->nr;
357 	int index = sensor_attr->index >> 3;
358 	int bit = sensor_attr->index & 0x07;
359 	u8 val;
360 
361 	if (nr == ALARM_STATUS) {
362 		val = (data->alarms[index] >> (bit)) & 1;
363 	} else {		/* BEEP_ENABLE */
364 		val = (data->beeps[index] >> (bit)) & 1;
365 	}
366 
367 	return sprintf(buf, "%u\n", val);
368 }
369 
370 static ssize_t
store_beep(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)371 store_beep(struct device *dev, struct device_attribute *attr,
372 	   const char *buf, size_t count)
373 {
374 	struct i2c_client *client = to_i2c_client(dev);
375 	struct w83793_data *data = i2c_get_clientdata(client);
376 	struct sensor_device_attribute_2 *sensor_attr =
377 	    to_sensor_dev_attr_2(attr);
378 	int index = sensor_attr->index >> 3;
379 	int shift = sensor_attr->index & 0x07;
380 	u8 beep_bit = 1 << shift;
381 	unsigned long val;
382 	int err;
383 
384 	err = kstrtoul(buf, 10, &val);
385 	if (err)
386 		return err;
387 
388 	if (val > 1)
389 		return -EINVAL;
390 
391 	mutex_lock(&data->update_lock);
392 	data->beeps[index] = w83793_read_value(client, W83793_REG_BEEP(index));
393 	data->beeps[index] &= ~beep_bit;
394 	data->beeps[index] |= val << shift;
395 	w83793_write_value(client, W83793_REG_BEEP(index), data->beeps[index]);
396 	mutex_unlock(&data->update_lock);
397 
398 	return count;
399 }
400 
401 static ssize_t
show_beep_enable(struct device * dev,struct device_attribute * attr,char * buf)402 show_beep_enable(struct device *dev, struct device_attribute *attr, char *buf)
403 {
404 	struct w83793_data *data = w83793_update_device(dev);
405 	return sprintf(buf, "%u\n", (data->beep_enable >> 1) & 0x01);
406 }
407 
408 static ssize_t
store_beep_enable(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)409 store_beep_enable(struct device *dev, struct device_attribute *attr,
410 		  const char *buf, size_t count)
411 {
412 	struct i2c_client *client = to_i2c_client(dev);
413 	struct w83793_data *data = i2c_get_clientdata(client);
414 	unsigned long val;
415 	int err;
416 
417 	err = kstrtoul(buf, 10, &val);
418 	if (err)
419 		return err;
420 
421 	if (val > 1)
422 		return -EINVAL;
423 
424 	mutex_lock(&data->update_lock);
425 	data->beep_enable = w83793_read_value(client, W83793_REG_OVT_BEEP)
426 			    & 0xfd;
427 	data->beep_enable |= val << 1;
428 	w83793_write_value(client, W83793_REG_OVT_BEEP, data->beep_enable);
429 	mutex_unlock(&data->update_lock);
430 
431 	return count;
432 }
433 
434 /* Write 0 to clear chassis alarm */
435 static ssize_t
store_chassis_clear(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)436 store_chassis_clear(struct device *dev,
437 		    struct device_attribute *attr, const char *buf,
438 		    size_t count)
439 {
440 	struct i2c_client *client = to_i2c_client(dev);
441 	struct w83793_data *data = i2c_get_clientdata(client);
442 	unsigned long val;
443 	u8 reg;
444 	int err;
445 
446 	err = kstrtoul(buf, 10, &val);
447 	if (err)
448 		return err;
449 	if (val)
450 		return -EINVAL;
451 
452 	mutex_lock(&data->update_lock);
453 	reg = w83793_read_value(client, W83793_REG_CLR_CHASSIS);
454 	w83793_write_value(client, W83793_REG_CLR_CHASSIS, reg | 0x80);
455 	data->valid = false;		/* Force cache refresh */
456 	mutex_unlock(&data->update_lock);
457 	return count;
458 }
459 
460 #define FAN_INPUT			0
461 #define FAN_MIN				1
462 static ssize_t
show_fan(struct device * dev,struct device_attribute * attr,char * buf)463 show_fan(struct device *dev, struct device_attribute *attr, char *buf)
464 {
465 	struct sensor_device_attribute_2 *sensor_attr =
466 	    to_sensor_dev_attr_2(attr);
467 	int nr = sensor_attr->nr;
468 	int index = sensor_attr->index;
469 	struct w83793_data *data = w83793_update_device(dev);
470 	u16 val;
471 
472 	if (nr == FAN_INPUT)
473 		val = data->fan[index] & 0x0fff;
474 	else
475 		val = data->fan_min[index] & 0x0fff;
476 
477 	return sprintf(buf, "%lu\n", FAN_FROM_REG(val));
478 }
479 
480 static ssize_t
store_fan_min(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)481 store_fan_min(struct device *dev, struct device_attribute *attr,
482 	      const char *buf, size_t count)
483 {
484 	struct sensor_device_attribute_2 *sensor_attr =
485 	    to_sensor_dev_attr_2(attr);
486 	int index = sensor_attr->index;
487 	struct i2c_client *client = to_i2c_client(dev);
488 	struct w83793_data *data = i2c_get_clientdata(client);
489 	unsigned long val;
490 	int err;
491 
492 	err = kstrtoul(buf, 10, &val);
493 	if (err)
494 		return err;
495 	val = FAN_TO_REG(val);
496 
497 	mutex_lock(&data->update_lock);
498 	data->fan_min[index] = val;
499 	w83793_write_value(client, W83793_REG_FAN_MIN(index),
500 			   (val >> 8) & 0xff);
501 	w83793_write_value(client, W83793_REG_FAN_MIN(index) + 1, val & 0xff);
502 	mutex_unlock(&data->update_lock);
503 
504 	return count;
505 }
506 
507 static ssize_t
show_pwm(struct device * dev,struct device_attribute * attr,char * buf)508 show_pwm(struct device *dev, struct device_attribute *attr, char *buf)
509 {
510 	struct sensor_device_attribute_2 *sensor_attr =
511 	    to_sensor_dev_attr_2(attr);
512 	struct w83793_data *data = w83793_update_device(dev);
513 	u16 val;
514 	int nr = sensor_attr->nr;
515 	int index = sensor_attr->index;
516 
517 	if (nr == PWM_STOP_TIME)
518 		val = TIME_FROM_REG(data->pwm_stop_time[index]);
519 	else
520 		val = (data->pwm[index][nr] & 0x3f) << 2;
521 
522 	return sprintf(buf, "%d\n", val);
523 }
524 
525 static ssize_t
store_pwm(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)526 store_pwm(struct device *dev, struct device_attribute *attr,
527 	  const char *buf, size_t count)
528 {
529 	struct i2c_client *client = to_i2c_client(dev);
530 	struct w83793_data *data = i2c_get_clientdata(client);
531 	struct sensor_device_attribute_2 *sensor_attr =
532 	    to_sensor_dev_attr_2(attr);
533 	int nr = sensor_attr->nr;
534 	int index = sensor_attr->index;
535 	unsigned long val;
536 	int err;
537 
538 	err = kstrtoul(buf, 10, &val);
539 	if (err)
540 		return err;
541 
542 	mutex_lock(&data->update_lock);
543 	if (nr == PWM_STOP_TIME) {
544 		val = TIME_TO_REG(val);
545 		data->pwm_stop_time[index] = val;
546 		w83793_write_value(client, W83793_REG_PWM_STOP_TIME(index),
547 				   val);
548 	} else {
549 		val = clamp_val(val, 0, 0xff) >> 2;
550 		data->pwm[index][nr] =
551 		    w83793_read_value(client, W83793_REG_PWM(index, nr)) & 0xc0;
552 		data->pwm[index][nr] |= val;
553 		w83793_write_value(client, W83793_REG_PWM(index, nr),
554 							data->pwm[index][nr]);
555 	}
556 
557 	mutex_unlock(&data->update_lock);
558 	return count;
559 }
560 
561 static ssize_t
show_temp(struct device * dev,struct device_attribute * attr,char * buf)562 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
563 {
564 	struct sensor_device_attribute_2 *sensor_attr =
565 	    to_sensor_dev_attr_2(attr);
566 	int nr = sensor_attr->nr;
567 	int index = sensor_attr->index;
568 	struct w83793_data *data = w83793_update_device(dev);
569 	long temp = TEMP_FROM_REG(data->temp[index][nr]);
570 
571 	if (nr == TEMP_READ && index < 4) {	/* Only TD1-TD4 have low bits */
572 		int low = ((data->temp_low_bits >> (index * 2)) & 0x03) * 250;
573 		temp += temp > 0 ? low : -low;
574 	}
575 	return sprintf(buf, "%ld\n", temp);
576 }
577 
578 static ssize_t
store_temp(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)579 store_temp(struct device *dev, struct device_attribute *attr,
580 	   const char *buf, size_t count)
581 {
582 	struct sensor_device_attribute_2 *sensor_attr =
583 	    to_sensor_dev_attr_2(attr);
584 	int nr = sensor_attr->nr;
585 	int index = sensor_attr->index;
586 	struct i2c_client *client = to_i2c_client(dev);
587 	struct w83793_data *data = i2c_get_clientdata(client);
588 	long tmp;
589 	int err;
590 
591 	err = kstrtol(buf, 10, &tmp);
592 	if (err)
593 		return err;
594 
595 	mutex_lock(&data->update_lock);
596 	data->temp[index][nr] = TEMP_TO_REG(tmp, -128, 127);
597 	w83793_write_value(client, W83793_REG_TEMP[index][nr],
598 			   data->temp[index][nr]);
599 	mutex_unlock(&data->update_lock);
600 	return count;
601 }
602 
603 /*
604  * TD1-TD4
605  * each has 4 mode:(2 bits)
606  * 0:	Stop monitor
607  * 1:	Use internal temp sensor(default)
608  * 2:	Reserved
609  * 3:	Use sensor in Intel CPU and get result by PECI
610  *
611  * TR1-TR2
612  * each has 2 mode:(1 bit)
613  * 0:	Disable temp sensor monitor
614  * 1:	To enable temp sensors monitor
615  */
616 
617 /* 0 disable, 6 PECI */
618 static u8 TO_TEMP_MODE[] = { 0, 0, 0, 6 };
619 
620 static ssize_t
show_temp_mode(struct device * dev,struct device_attribute * attr,char * buf)621 show_temp_mode(struct device *dev, struct device_attribute *attr, char *buf)
622 {
623 	struct w83793_data *data = w83793_update_device(dev);
624 	struct sensor_device_attribute_2 *sensor_attr =
625 	    to_sensor_dev_attr_2(attr);
626 	int index = sensor_attr->index;
627 	u8 mask = (index < 4) ? 0x03 : 0x01;
628 	u8 shift = (index < 4) ? (2 * index) : (index - 4);
629 	u8 tmp;
630 	index = (index < 4) ? 0 : 1;
631 
632 	tmp = (data->temp_mode[index] >> shift) & mask;
633 
634 	/* for the internal sensor, found out if diode or thermistor */
635 	if (tmp == 1)
636 		tmp = index == 0 ? 3 : 4;
637 	else
638 		tmp = TO_TEMP_MODE[tmp];
639 
640 	return sprintf(buf, "%d\n", tmp);
641 }
642 
643 static ssize_t
store_temp_mode(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)644 store_temp_mode(struct device *dev, struct device_attribute *attr,
645 		const char *buf, size_t count)
646 {
647 	struct i2c_client *client = to_i2c_client(dev);
648 	struct w83793_data *data = i2c_get_clientdata(client);
649 	struct sensor_device_attribute_2 *sensor_attr =
650 	    to_sensor_dev_attr_2(attr);
651 	int index = sensor_attr->index;
652 	u8 mask = (index < 4) ? 0x03 : 0x01;
653 	u8 shift = (index < 4) ? (2 * index) : (index - 4);
654 	unsigned long val;
655 	int err;
656 
657 	err = kstrtoul(buf, 10, &val);
658 	if (err)
659 		return err;
660 
661 	/* transform the sysfs interface values into table above */
662 	if ((val == 6) && (index < 4)) {
663 		val -= 3;
664 	} else if ((val == 3 && index < 4)
665 		|| (val == 4 && index >= 4)) {
666 		/* transform diode or thermistor into internal enable */
667 		val = !!val;
668 	} else {
669 		return -EINVAL;
670 	}
671 
672 	index = (index < 4) ? 0 : 1;
673 	mutex_lock(&data->update_lock);
674 	data->temp_mode[index] =
675 	    w83793_read_value(client, W83793_REG_TEMP_MODE[index]);
676 	data->temp_mode[index] &= ~(mask << shift);
677 	data->temp_mode[index] |= val << shift;
678 	w83793_write_value(client, W83793_REG_TEMP_MODE[index],
679 							data->temp_mode[index]);
680 	mutex_unlock(&data->update_lock);
681 
682 	return count;
683 }
684 
685 #define SETUP_PWM_DEFAULT		0
686 #define SETUP_PWM_UPTIME		1	/* Unit in 0.1s */
687 #define SETUP_PWM_DOWNTIME		2	/* Unit in 0.1s */
688 #define SETUP_TEMP_CRITICAL		3
689 static ssize_t
show_sf_setup(struct device * dev,struct device_attribute * attr,char * buf)690 show_sf_setup(struct device *dev, struct device_attribute *attr, char *buf)
691 {
692 	struct sensor_device_attribute_2 *sensor_attr =
693 	    to_sensor_dev_attr_2(attr);
694 	int nr = sensor_attr->nr;
695 	struct w83793_data *data = w83793_update_device(dev);
696 	u32 val = 0;
697 
698 	if (nr == SETUP_PWM_DEFAULT)
699 		val = (data->pwm_default & 0x3f) << 2;
700 	else if (nr == SETUP_PWM_UPTIME)
701 		val = TIME_FROM_REG(data->pwm_uptime);
702 	else if (nr == SETUP_PWM_DOWNTIME)
703 		val = TIME_FROM_REG(data->pwm_downtime);
704 	else if (nr == SETUP_TEMP_CRITICAL)
705 		val = TEMP_FROM_REG(data->temp_critical & 0x7f);
706 
707 	return sprintf(buf, "%d\n", val);
708 }
709 
710 static ssize_t
store_sf_setup(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)711 store_sf_setup(struct device *dev, struct device_attribute *attr,
712 	       const char *buf, size_t count)
713 {
714 	struct sensor_device_attribute_2 *sensor_attr =
715 	    to_sensor_dev_attr_2(attr);
716 	int nr = sensor_attr->nr;
717 	struct i2c_client *client = to_i2c_client(dev);
718 	struct w83793_data *data = i2c_get_clientdata(client);
719 	long val;
720 	int err;
721 
722 	err = kstrtol(buf, 10, &val);
723 	if (err)
724 		return err;
725 
726 	mutex_lock(&data->update_lock);
727 	if (nr == SETUP_PWM_DEFAULT) {
728 		data->pwm_default =
729 		    w83793_read_value(client, W83793_REG_PWM_DEFAULT) & 0xc0;
730 		data->pwm_default |= clamp_val(val, 0, 0xff) >> 2;
731 		w83793_write_value(client, W83793_REG_PWM_DEFAULT,
732 							data->pwm_default);
733 	} else if (nr == SETUP_PWM_UPTIME) {
734 		data->pwm_uptime = TIME_TO_REG(val);
735 		data->pwm_uptime += data->pwm_uptime == 0 ? 1 : 0;
736 		w83793_write_value(client, W83793_REG_PWM_UPTIME,
737 							data->pwm_uptime);
738 	} else if (nr == SETUP_PWM_DOWNTIME) {
739 		data->pwm_downtime = TIME_TO_REG(val);
740 		data->pwm_downtime += data->pwm_downtime == 0 ? 1 : 0;
741 		w83793_write_value(client, W83793_REG_PWM_DOWNTIME,
742 							data->pwm_downtime);
743 	} else {		/* SETUP_TEMP_CRITICAL */
744 		data->temp_critical =
745 		    w83793_read_value(client, W83793_REG_TEMP_CRITICAL) & 0x80;
746 		data->temp_critical |= TEMP_TO_REG(val, 0, 0x7f);
747 		w83793_write_value(client, W83793_REG_TEMP_CRITICAL,
748 							data->temp_critical);
749 	}
750 
751 	mutex_unlock(&data->update_lock);
752 	return count;
753 }
754 
755 /*
756  * Temp SmartFan control
757  * TEMP_FAN_MAP
758  * Temp channel control which pwm fan, bitfield, bit 0 indicate pwm1...
759  * It's possible two or more temp channels control the same fan, w83793
760  * always prefers to pick the most critical request and applies it to
761  * the related Fan.
762  * It's possible one fan is not in any mapping of 6 temp channels, this
763  * means the fan is manual mode
764  *
765  * TEMP_PWM_ENABLE
766  * Each temp channel has its own SmartFan mode, and temp channel
767  * control fans that are set by TEMP_FAN_MAP
768  * 0:	SmartFanII mode
769  * 1:	Thermal Cruise Mode
770  *
771  * TEMP_CRUISE
772  * Target temperature in thermal cruise mode, w83793 will try to turn
773  * fan speed to keep the temperature of target device around this
774  * temperature.
775  *
776  * TEMP_TOLERANCE
777  * If Temp higher or lower than target with this tolerance, w83793
778  * will take actions to speed up or slow down the fan to keep the
779  * temperature within the tolerance range.
780  */
781 
782 #define TEMP_FAN_MAP			0
783 #define TEMP_PWM_ENABLE			1
784 #define TEMP_CRUISE			2
785 #define TEMP_TOLERANCE			3
786 static ssize_t
show_sf_ctrl(struct device * dev,struct device_attribute * attr,char * buf)787 show_sf_ctrl(struct device *dev, struct device_attribute *attr, char *buf)
788 {
789 	struct sensor_device_attribute_2 *sensor_attr =
790 	    to_sensor_dev_attr_2(attr);
791 	int nr = sensor_attr->nr;
792 	int index = sensor_attr->index;
793 	struct w83793_data *data = w83793_update_device(dev);
794 	u32 val;
795 
796 	if (nr == TEMP_FAN_MAP) {
797 		val = data->temp_fan_map[index];
798 	} else if (nr == TEMP_PWM_ENABLE) {
799 		/* +2 to transform into 2 and 3 to conform with sysfs intf */
800 		val = ((data->pwm_enable >> index) & 0x01) + 2;
801 	} else if (nr == TEMP_CRUISE) {
802 		val = TEMP_FROM_REG(data->temp_cruise[index] & 0x7f);
803 	} else {		/* TEMP_TOLERANCE */
804 		val = data->tolerance[index >> 1] >> ((index & 0x01) ? 4 : 0);
805 		val = TEMP_FROM_REG(val & 0x0f);
806 	}
807 	return sprintf(buf, "%d\n", val);
808 }
809 
810 static ssize_t
store_sf_ctrl(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)811 store_sf_ctrl(struct device *dev, struct device_attribute *attr,
812 	      const char *buf, size_t count)
813 {
814 	struct sensor_device_attribute_2 *sensor_attr =
815 	    to_sensor_dev_attr_2(attr);
816 	int nr = sensor_attr->nr;
817 	int index = sensor_attr->index;
818 	struct i2c_client *client = to_i2c_client(dev);
819 	struct w83793_data *data = i2c_get_clientdata(client);
820 	long val;
821 	int err;
822 
823 	err = kstrtol(buf, 10, &val);
824 	if (err)
825 		return err;
826 
827 	mutex_lock(&data->update_lock);
828 	if (nr == TEMP_FAN_MAP) {
829 		val = clamp_val(val, 0, 255);
830 		w83793_write_value(client, W83793_REG_TEMP_FAN_MAP(index), val);
831 		data->temp_fan_map[index] = val;
832 	} else if (nr == TEMP_PWM_ENABLE) {
833 		if (val == 2 || val == 3) {
834 			data->pwm_enable =
835 			    w83793_read_value(client, W83793_REG_PWM_ENABLE);
836 			if (val - 2)
837 				data->pwm_enable |= 1 << index;
838 			else
839 				data->pwm_enable &= ~(1 << index);
840 			w83793_write_value(client, W83793_REG_PWM_ENABLE,
841 							data->pwm_enable);
842 		} else {
843 			mutex_unlock(&data->update_lock);
844 			return -EINVAL;
845 		}
846 	} else if (nr == TEMP_CRUISE) {
847 		data->temp_cruise[index] =
848 		    w83793_read_value(client, W83793_REG_TEMP_CRUISE(index));
849 		data->temp_cruise[index] &= 0x80;
850 		data->temp_cruise[index] |= TEMP_TO_REG(val, 0, 0x7f);
851 
852 		w83793_write_value(client, W83793_REG_TEMP_CRUISE(index),
853 						data->temp_cruise[index]);
854 	} else {		/* TEMP_TOLERANCE */
855 		int i = index >> 1;
856 		u8 shift = (index & 0x01) ? 4 : 0;
857 		data->tolerance[i] =
858 		    w83793_read_value(client, W83793_REG_TEMP_TOL(i));
859 
860 		data->tolerance[i] &= ~(0x0f << shift);
861 		data->tolerance[i] |= TEMP_TO_REG(val, 0, 0x0f) << shift;
862 		w83793_write_value(client, W83793_REG_TEMP_TOL(i),
863 							data->tolerance[i]);
864 	}
865 
866 	mutex_unlock(&data->update_lock);
867 	return count;
868 }
869 
870 static ssize_t
show_sf2_pwm(struct device * dev,struct device_attribute * attr,char * buf)871 show_sf2_pwm(struct device *dev, struct device_attribute *attr, char *buf)
872 {
873 	struct sensor_device_attribute_2 *sensor_attr =
874 	    to_sensor_dev_attr_2(attr);
875 	int nr = sensor_attr->nr;
876 	int index = sensor_attr->index;
877 	struct w83793_data *data = w83793_update_device(dev);
878 
879 	return sprintf(buf, "%d\n", (data->sf2_pwm[index][nr] & 0x3f) << 2);
880 }
881 
882 static ssize_t
store_sf2_pwm(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)883 store_sf2_pwm(struct device *dev, struct device_attribute *attr,
884 	      const char *buf, size_t count)
885 {
886 	struct i2c_client *client = to_i2c_client(dev);
887 	struct w83793_data *data = i2c_get_clientdata(client);
888 	struct sensor_device_attribute_2 *sensor_attr =
889 	    to_sensor_dev_attr_2(attr);
890 	int nr = sensor_attr->nr;
891 	int index = sensor_attr->index;
892 	unsigned long val;
893 	int err;
894 
895 	err = kstrtoul(buf, 10, &val);
896 	if (err)
897 		return err;
898 	val = clamp_val(val, 0, 0xff) >> 2;
899 
900 	mutex_lock(&data->update_lock);
901 	data->sf2_pwm[index][nr] =
902 	    w83793_read_value(client, W83793_REG_SF2_PWM(index, nr)) & 0xc0;
903 	data->sf2_pwm[index][nr] |= val;
904 	w83793_write_value(client, W83793_REG_SF2_PWM(index, nr),
905 						data->sf2_pwm[index][nr]);
906 	mutex_unlock(&data->update_lock);
907 	return count;
908 }
909 
910 static ssize_t
show_sf2_temp(struct device * dev,struct device_attribute * attr,char * buf)911 show_sf2_temp(struct device *dev, struct device_attribute *attr, char *buf)
912 {
913 	struct sensor_device_attribute_2 *sensor_attr =
914 	    to_sensor_dev_attr_2(attr);
915 	int nr = sensor_attr->nr;
916 	int index = sensor_attr->index;
917 	struct w83793_data *data = w83793_update_device(dev);
918 
919 	return sprintf(buf, "%ld\n",
920 		       TEMP_FROM_REG(data->sf2_temp[index][nr] & 0x7f));
921 }
922 
923 static ssize_t
store_sf2_temp(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)924 store_sf2_temp(struct device *dev, struct device_attribute *attr,
925 	       const char *buf, size_t count)
926 {
927 	struct i2c_client *client = to_i2c_client(dev);
928 	struct w83793_data *data = i2c_get_clientdata(client);
929 	struct sensor_device_attribute_2 *sensor_attr =
930 	    to_sensor_dev_attr_2(attr);
931 	int nr = sensor_attr->nr;
932 	int index = sensor_attr->index;
933 	long val;
934 	int err;
935 
936 	err = kstrtol(buf, 10, &val);
937 	if (err)
938 		return err;
939 	val = TEMP_TO_REG(val, 0, 0x7f);
940 
941 	mutex_lock(&data->update_lock);
942 	data->sf2_temp[index][nr] =
943 	    w83793_read_value(client, W83793_REG_SF2_TEMP(index, nr)) & 0x80;
944 	data->sf2_temp[index][nr] |= val;
945 	w83793_write_value(client, W83793_REG_SF2_TEMP(index, nr),
946 					     data->sf2_temp[index][nr]);
947 	mutex_unlock(&data->update_lock);
948 	return count;
949 }
950 
951 /* only Vcore A/B and Vtt have additional 2 bits precision */
952 static ssize_t
show_in(struct device * dev,struct device_attribute * attr,char * buf)953 show_in(struct device *dev, struct device_attribute *attr, char *buf)
954 {
955 	struct sensor_device_attribute_2 *sensor_attr =
956 	    to_sensor_dev_attr_2(attr);
957 	int nr = sensor_attr->nr;
958 	int index = sensor_attr->index;
959 	struct w83793_data *data = w83793_update_device(dev);
960 	u16 val = data->in[index][nr];
961 
962 	if (index < 3) {
963 		val <<= 2;
964 		val += (data->in_low_bits[nr] >> (index * 2)) & 0x3;
965 	}
966 	/* voltage inputs 5VDD and 5VSB needs 150mV offset */
967 	val = val * scale_in[index] + scale_in_add[index];
968 	return sprintf(buf, "%d\n", val);
969 }
970 
971 static ssize_t
store_in(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)972 store_in(struct device *dev, struct device_attribute *attr,
973 	 const char *buf, size_t count)
974 {
975 	struct sensor_device_attribute_2 *sensor_attr =
976 	    to_sensor_dev_attr_2(attr);
977 	int nr = sensor_attr->nr;
978 	int index = sensor_attr->index;
979 	struct i2c_client *client = to_i2c_client(dev);
980 	struct w83793_data *data = i2c_get_clientdata(client);
981 	unsigned long val;
982 	int err;
983 
984 	err = kstrtoul(buf, 10, &val);
985 	if (err)
986 		return err;
987 	val = (val + scale_in[index] / 2) / scale_in[index];
988 
989 	mutex_lock(&data->update_lock);
990 	if (index > 2) {
991 		/* fix the limit values of 5VDD and 5VSB to ALARM mechanism */
992 		if (nr == 1 || nr == 2)
993 			val -= scale_in_add[index] / scale_in[index];
994 		val = clamp_val(val, 0, 255);
995 	} else {
996 		val = clamp_val(val, 0, 0x3FF);
997 		data->in_low_bits[nr] =
998 		    w83793_read_value(client, W83793_REG_IN_LOW_BITS[nr]);
999 		data->in_low_bits[nr] &= ~(0x03 << (2 * index));
1000 		data->in_low_bits[nr] |= (val & 0x03) << (2 * index);
1001 		w83793_write_value(client, W83793_REG_IN_LOW_BITS[nr],
1002 						     data->in_low_bits[nr]);
1003 		val >>= 2;
1004 	}
1005 	data->in[index][nr] = val;
1006 	w83793_write_value(client, W83793_REG_IN[index][nr],
1007 							data->in[index][nr]);
1008 	mutex_unlock(&data->update_lock);
1009 	return count;
1010 }
1011 
1012 #define NOT_USED			-1
1013 
1014 #define SENSOR_ATTR_IN(index)						\
1015 	SENSOR_ATTR_2(in##index##_input, S_IRUGO, show_in, NULL,	\
1016 		IN_READ, index),					\
1017 	SENSOR_ATTR_2(in##index##_max, S_IRUGO | S_IWUSR, show_in,	\
1018 		store_in, IN_MAX, index),				\
1019 	SENSOR_ATTR_2(in##index##_min, S_IRUGO | S_IWUSR, show_in,	\
1020 		store_in, IN_LOW, index),				\
1021 	SENSOR_ATTR_2(in##index##_alarm, S_IRUGO, show_alarm_beep,	\
1022 		NULL, ALARM_STATUS, index + ((index > 2) ? 1 : 0)),	\
1023 	SENSOR_ATTR_2(in##index##_beep, S_IWUSR | S_IRUGO,		\
1024 		show_alarm_beep, store_beep, BEEP_ENABLE,		\
1025 		index + ((index > 2) ? 1 : 0))
1026 
1027 #define SENSOR_ATTR_FAN(index)						\
1028 	SENSOR_ATTR_2(fan##index##_alarm, S_IRUGO, show_alarm_beep,	\
1029 		NULL, ALARM_STATUS, index + 17),			\
1030 	SENSOR_ATTR_2(fan##index##_beep, S_IWUSR | S_IRUGO,		\
1031 		show_alarm_beep, store_beep, BEEP_ENABLE, index + 17),	\
1032 	SENSOR_ATTR_2(fan##index##_input, S_IRUGO, show_fan,		\
1033 		NULL, FAN_INPUT, index - 1),				\
1034 	SENSOR_ATTR_2(fan##index##_min, S_IWUSR | S_IRUGO,		\
1035 		show_fan, store_fan_min, FAN_MIN, index - 1)
1036 
1037 #define SENSOR_ATTR_PWM(index)						\
1038 	SENSOR_ATTR_2(pwm##index, S_IWUSR | S_IRUGO, show_pwm,		\
1039 		store_pwm, PWM_DUTY, index - 1),			\
1040 	SENSOR_ATTR_2(pwm##index##_nonstop, S_IWUSR | S_IRUGO,		\
1041 		show_pwm, store_pwm, PWM_NONSTOP, index - 1),		\
1042 	SENSOR_ATTR_2(pwm##index##_start, S_IWUSR | S_IRUGO,		\
1043 		show_pwm, store_pwm, PWM_START, index - 1),		\
1044 	SENSOR_ATTR_2(pwm##index##_stop_time, S_IWUSR | S_IRUGO,	\
1045 		show_pwm, store_pwm, PWM_STOP_TIME, index - 1)
1046 
1047 #define SENSOR_ATTR_TEMP(index)						\
1048 	SENSOR_ATTR_2(temp##index##_type, S_IRUGO | S_IWUSR,		\
1049 		show_temp_mode, store_temp_mode, NOT_USED, index - 1),	\
1050 	SENSOR_ATTR_2(temp##index##_input, S_IRUGO, show_temp,		\
1051 		NULL, TEMP_READ, index - 1),				\
1052 	SENSOR_ATTR_2(temp##index##_max, S_IRUGO | S_IWUSR, show_temp,	\
1053 		store_temp, TEMP_CRIT, index - 1),			\
1054 	SENSOR_ATTR_2(temp##index##_max_hyst, S_IRUGO | S_IWUSR,	\
1055 		show_temp, store_temp, TEMP_CRIT_HYST, index - 1),	\
1056 	SENSOR_ATTR_2(temp##index##_warn, S_IRUGO | S_IWUSR, show_temp,	\
1057 		store_temp, TEMP_WARN, index - 1),			\
1058 	SENSOR_ATTR_2(temp##index##_warn_hyst, S_IRUGO | S_IWUSR,	\
1059 		show_temp, store_temp, TEMP_WARN_HYST, index - 1),	\
1060 	SENSOR_ATTR_2(temp##index##_alarm, S_IRUGO,			\
1061 		show_alarm_beep, NULL, ALARM_STATUS, index + 11),	\
1062 	SENSOR_ATTR_2(temp##index##_beep, S_IWUSR | S_IRUGO,		\
1063 		show_alarm_beep, store_beep, BEEP_ENABLE, index + 11),	\
1064 	SENSOR_ATTR_2(temp##index##_auto_channels_pwm,			\
1065 		S_IRUGO | S_IWUSR, show_sf_ctrl, store_sf_ctrl,		\
1066 		TEMP_FAN_MAP, index - 1),				\
1067 	SENSOR_ATTR_2(temp##index##_pwm_enable, S_IWUSR | S_IRUGO,	\
1068 		show_sf_ctrl, store_sf_ctrl, TEMP_PWM_ENABLE,		\
1069 		index - 1),						\
1070 	SENSOR_ATTR_2(thermal_cruise##index, S_IRUGO | S_IWUSR,		\
1071 		show_sf_ctrl, store_sf_ctrl, TEMP_CRUISE, index - 1),	\
1072 	SENSOR_ATTR_2(tolerance##index, S_IRUGO | S_IWUSR, show_sf_ctrl,\
1073 		store_sf_ctrl, TEMP_TOLERANCE, index - 1),		\
1074 	SENSOR_ATTR_2(temp##index##_auto_point1_pwm, S_IRUGO | S_IWUSR, \
1075 		show_sf2_pwm, store_sf2_pwm, 0, index - 1),		\
1076 	SENSOR_ATTR_2(temp##index##_auto_point2_pwm, S_IRUGO | S_IWUSR, \
1077 		show_sf2_pwm, store_sf2_pwm, 1, index - 1),		\
1078 	SENSOR_ATTR_2(temp##index##_auto_point3_pwm, S_IRUGO | S_IWUSR, \
1079 		show_sf2_pwm, store_sf2_pwm, 2, index - 1),		\
1080 	SENSOR_ATTR_2(temp##index##_auto_point4_pwm, S_IRUGO | S_IWUSR, \
1081 		show_sf2_pwm, store_sf2_pwm, 3, index - 1),		\
1082 	SENSOR_ATTR_2(temp##index##_auto_point5_pwm, S_IRUGO | S_IWUSR, \
1083 		show_sf2_pwm, store_sf2_pwm, 4, index - 1),		\
1084 	SENSOR_ATTR_2(temp##index##_auto_point6_pwm, S_IRUGO | S_IWUSR, \
1085 		show_sf2_pwm, store_sf2_pwm, 5, index - 1),		\
1086 	SENSOR_ATTR_2(temp##index##_auto_point7_pwm, S_IRUGO | S_IWUSR, \
1087 		show_sf2_pwm, store_sf2_pwm, 6, index - 1),		\
1088 	SENSOR_ATTR_2(temp##index##_auto_point1_temp, S_IRUGO | S_IWUSR,\
1089 		show_sf2_temp, store_sf2_temp, 0, index - 1),		\
1090 	SENSOR_ATTR_2(temp##index##_auto_point2_temp, S_IRUGO | S_IWUSR,\
1091 		show_sf2_temp, store_sf2_temp, 1, index - 1),		\
1092 	SENSOR_ATTR_2(temp##index##_auto_point3_temp, S_IRUGO | S_IWUSR,\
1093 		show_sf2_temp, store_sf2_temp, 2, index - 1),		\
1094 	SENSOR_ATTR_2(temp##index##_auto_point4_temp, S_IRUGO | S_IWUSR,\
1095 		show_sf2_temp, store_sf2_temp, 3, index - 1),		\
1096 	SENSOR_ATTR_2(temp##index##_auto_point5_temp, S_IRUGO | S_IWUSR,\
1097 		show_sf2_temp, store_sf2_temp, 4, index - 1),		\
1098 	SENSOR_ATTR_2(temp##index##_auto_point6_temp, S_IRUGO | S_IWUSR,\
1099 		show_sf2_temp, store_sf2_temp, 5, index - 1),		\
1100 	SENSOR_ATTR_2(temp##index##_auto_point7_temp, S_IRUGO | S_IWUSR,\
1101 		show_sf2_temp, store_sf2_temp, 6, index - 1)
1102 
1103 static struct sensor_device_attribute_2 w83793_sensor_attr_2[] = {
1104 	SENSOR_ATTR_IN(0),
1105 	SENSOR_ATTR_IN(1),
1106 	SENSOR_ATTR_IN(2),
1107 	SENSOR_ATTR_IN(3),
1108 	SENSOR_ATTR_IN(4),
1109 	SENSOR_ATTR_IN(5),
1110 	SENSOR_ATTR_IN(6),
1111 	SENSOR_ATTR_IN(7),
1112 	SENSOR_ATTR_IN(8),
1113 	SENSOR_ATTR_IN(9),
1114 	SENSOR_ATTR_FAN(1),
1115 	SENSOR_ATTR_FAN(2),
1116 	SENSOR_ATTR_FAN(3),
1117 	SENSOR_ATTR_FAN(4),
1118 	SENSOR_ATTR_FAN(5),
1119 	SENSOR_ATTR_PWM(1),
1120 	SENSOR_ATTR_PWM(2),
1121 	SENSOR_ATTR_PWM(3),
1122 };
1123 
1124 static struct sensor_device_attribute_2 w83793_temp[] = {
1125 	SENSOR_ATTR_TEMP(1),
1126 	SENSOR_ATTR_TEMP(2),
1127 	SENSOR_ATTR_TEMP(3),
1128 	SENSOR_ATTR_TEMP(4),
1129 	SENSOR_ATTR_TEMP(5),
1130 	SENSOR_ATTR_TEMP(6),
1131 };
1132 
1133 /* Fan6-Fan12 */
1134 static struct sensor_device_attribute_2 w83793_left_fan[] = {
1135 	SENSOR_ATTR_FAN(6),
1136 	SENSOR_ATTR_FAN(7),
1137 	SENSOR_ATTR_FAN(8),
1138 	SENSOR_ATTR_FAN(9),
1139 	SENSOR_ATTR_FAN(10),
1140 	SENSOR_ATTR_FAN(11),
1141 	SENSOR_ATTR_FAN(12),
1142 };
1143 
1144 /* Pwm4-Pwm8 */
1145 static struct sensor_device_attribute_2 w83793_left_pwm[] = {
1146 	SENSOR_ATTR_PWM(4),
1147 	SENSOR_ATTR_PWM(5),
1148 	SENSOR_ATTR_PWM(6),
1149 	SENSOR_ATTR_PWM(7),
1150 	SENSOR_ATTR_PWM(8),
1151 };
1152 
1153 static struct sensor_device_attribute_2 w83793_vid[] = {
1154 	SENSOR_ATTR_2(cpu0_vid, S_IRUGO, show_vid, NULL, NOT_USED, 0),
1155 	SENSOR_ATTR_2(cpu1_vid, S_IRUGO, show_vid, NULL, NOT_USED, 1),
1156 };
1157 static DEVICE_ATTR_RW(vrm);
1158 
1159 static struct sensor_device_attribute_2 sda_single_files[] = {
1160 	SENSOR_ATTR_2(intrusion0_alarm, S_IWUSR | S_IRUGO, show_alarm_beep,
1161 		      store_chassis_clear, ALARM_STATUS, 30),
1162 	SENSOR_ATTR_2(beep_enable, S_IWUSR | S_IRUGO, show_beep_enable,
1163 		      store_beep_enable, NOT_USED, NOT_USED),
1164 	SENSOR_ATTR_2(pwm_default, S_IWUSR | S_IRUGO, show_sf_setup,
1165 		      store_sf_setup, SETUP_PWM_DEFAULT, NOT_USED),
1166 	SENSOR_ATTR_2(pwm_uptime, S_IWUSR | S_IRUGO, show_sf_setup,
1167 		      store_sf_setup, SETUP_PWM_UPTIME, NOT_USED),
1168 	SENSOR_ATTR_2(pwm_downtime, S_IWUSR | S_IRUGO, show_sf_setup,
1169 		      store_sf_setup, SETUP_PWM_DOWNTIME, NOT_USED),
1170 	SENSOR_ATTR_2(temp_critical, S_IWUSR | S_IRUGO, show_sf_setup,
1171 		      store_sf_setup, SETUP_TEMP_CRITICAL, NOT_USED),
1172 };
1173 
w83793_init_client(struct i2c_client * client)1174 static void w83793_init_client(struct i2c_client *client)
1175 {
1176 	if (reset)
1177 		w83793_write_value(client, W83793_REG_CONFIG, 0x80);
1178 
1179 	/* Start monitoring */
1180 	w83793_write_value(client, W83793_REG_CONFIG,
1181 			   w83793_read_value(client, W83793_REG_CONFIG) | 0x01);
1182 }
1183 
1184 /*
1185  * Watchdog routines
1186  */
1187 
watchdog_set_timeout(struct w83793_data * data,int timeout)1188 static int watchdog_set_timeout(struct w83793_data *data, int timeout)
1189 {
1190 	unsigned int mtimeout;
1191 	int ret;
1192 
1193 	mtimeout = DIV_ROUND_UP(timeout, 60);
1194 
1195 	if (mtimeout > 255)
1196 		return -EINVAL;
1197 
1198 	mutex_lock(&data->watchdog_lock);
1199 	if (!data->client) {
1200 		ret = -ENODEV;
1201 		goto leave;
1202 	}
1203 
1204 	data->watchdog_timeout = mtimeout;
1205 
1206 	/* Set Timeout value (in Minutes) */
1207 	w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
1208 			   data->watchdog_timeout);
1209 
1210 	ret = mtimeout * 60;
1211 
1212 leave:
1213 	mutex_unlock(&data->watchdog_lock);
1214 	return ret;
1215 }
1216 
watchdog_get_timeout(struct w83793_data * data)1217 static int watchdog_get_timeout(struct w83793_data *data)
1218 {
1219 	int timeout;
1220 
1221 	mutex_lock(&data->watchdog_lock);
1222 	timeout = data->watchdog_timeout * 60;
1223 	mutex_unlock(&data->watchdog_lock);
1224 
1225 	return timeout;
1226 }
1227 
watchdog_trigger(struct w83793_data * data)1228 static int watchdog_trigger(struct w83793_data *data)
1229 {
1230 	int ret = 0;
1231 
1232 	mutex_lock(&data->watchdog_lock);
1233 	if (!data->client) {
1234 		ret = -ENODEV;
1235 		goto leave;
1236 	}
1237 
1238 	/* Set Timeout value (in Minutes) */
1239 	w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
1240 			   data->watchdog_timeout);
1241 
1242 leave:
1243 	mutex_unlock(&data->watchdog_lock);
1244 	return ret;
1245 }
1246 
watchdog_enable(struct w83793_data * data)1247 static int watchdog_enable(struct w83793_data *data)
1248 {
1249 	int ret = 0;
1250 
1251 	mutex_lock(&data->watchdog_lock);
1252 	if (!data->client) {
1253 		ret = -ENODEV;
1254 		goto leave;
1255 	}
1256 
1257 	/* Set initial timeout */
1258 	w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
1259 			   data->watchdog_timeout);
1260 
1261 	/* Enable Soft Watchdog */
1262 	w83793_write_value(data->client, W83793_REG_WDT_LOCK, 0x55);
1263 
1264 leave:
1265 	mutex_unlock(&data->watchdog_lock);
1266 	return ret;
1267 }
1268 
watchdog_disable(struct w83793_data * data)1269 static int watchdog_disable(struct w83793_data *data)
1270 {
1271 	int ret = 0;
1272 
1273 	mutex_lock(&data->watchdog_lock);
1274 	if (!data->client) {
1275 		ret = -ENODEV;
1276 		goto leave;
1277 	}
1278 
1279 	/* Disable Soft Watchdog */
1280 	w83793_write_value(data->client, W83793_REG_WDT_LOCK, 0xAA);
1281 
1282 leave:
1283 	mutex_unlock(&data->watchdog_lock);
1284 	return ret;
1285 }
1286 
watchdog_open(struct inode * inode,struct file * filp)1287 static int watchdog_open(struct inode *inode, struct file *filp)
1288 {
1289 	struct w83793_data *pos, *data = NULL;
1290 	int watchdog_is_open;
1291 
1292 	/*
1293 	 * We get called from drivers/char/misc.c with misc_mtx hold, and we
1294 	 * call misc_register() from  w83793_probe() with watchdog_data_mutex
1295 	 * hold, as misc_register() takes the misc_mtx lock, this is a possible
1296 	 * deadlock, so we use mutex_trylock here.
1297 	 */
1298 	if (!mutex_trylock(&watchdog_data_mutex))
1299 		return -ERESTARTSYS;
1300 	list_for_each_entry(pos, &watchdog_data_list, list) {
1301 		if (pos->watchdog_miscdev.minor == iminor(inode)) {
1302 			data = pos;
1303 			break;
1304 		}
1305 	}
1306 
1307 	/* Check, if device is already open */
1308 	watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
1309 
1310 	/*
1311 	 * Increase data reference counter (if not already done).
1312 	 * Note we can never not have found data, so we don't check for this
1313 	 */
1314 	if (!watchdog_is_open)
1315 		kref_get(&data->kref);
1316 
1317 	mutex_unlock(&watchdog_data_mutex);
1318 
1319 	/* Check, if device is already open and possibly issue error */
1320 	if (watchdog_is_open)
1321 		return -EBUSY;
1322 
1323 	/* Enable Soft Watchdog */
1324 	watchdog_enable(data);
1325 
1326 	/* Store pointer to data into filp's private data */
1327 	filp->private_data = data;
1328 
1329 	return stream_open(inode, filp);
1330 }
1331 
watchdog_close(struct inode * inode,struct file * filp)1332 static int watchdog_close(struct inode *inode, struct file *filp)
1333 {
1334 	struct w83793_data *data = filp->private_data;
1335 
1336 	if (data->watchdog_expect_close) {
1337 		watchdog_disable(data);
1338 		data->watchdog_expect_close = 0;
1339 	} else {
1340 		watchdog_trigger(data);
1341 		dev_crit(&data->client->dev,
1342 			"unexpected close, not stopping watchdog!\n");
1343 	}
1344 
1345 	clear_bit(0, &data->watchdog_is_open);
1346 
1347 	/* Decrease data reference counter */
1348 	mutex_lock(&watchdog_data_mutex);
1349 	kref_put(&data->kref, w83793_release_resources);
1350 	mutex_unlock(&watchdog_data_mutex);
1351 
1352 	return 0;
1353 }
1354 
watchdog_write(struct file * filp,const char __user * buf,size_t count,loff_t * offset)1355 static ssize_t watchdog_write(struct file *filp, const char __user *buf,
1356 	size_t count, loff_t *offset)
1357 {
1358 	ssize_t ret;
1359 	struct w83793_data *data = filp->private_data;
1360 
1361 	if (count) {
1362 		if (!nowayout) {
1363 			size_t i;
1364 
1365 			/* Clear it in case it was set with a previous write */
1366 			data->watchdog_expect_close = 0;
1367 
1368 			for (i = 0; i != count; i++) {
1369 				char c;
1370 				if (get_user(c, buf + i))
1371 					return -EFAULT;
1372 				if (c == 'V')
1373 					data->watchdog_expect_close = 1;
1374 			}
1375 		}
1376 		ret = watchdog_trigger(data);
1377 		if (ret < 0)
1378 			return ret;
1379 	}
1380 	return count;
1381 }
1382 
watchdog_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)1383 static long watchdog_ioctl(struct file *filp, unsigned int cmd,
1384 			   unsigned long arg)
1385 {
1386 	struct watchdog_info ident = {
1387 		.options = WDIOF_KEEPALIVEPING |
1388 			   WDIOF_SETTIMEOUT |
1389 			   WDIOF_CARDRESET,
1390 		.identity = "w83793 watchdog"
1391 	};
1392 
1393 	int val, ret = 0;
1394 	struct w83793_data *data = filp->private_data;
1395 
1396 	switch (cmd) {
1397 	case WDIOC_GETSUPPORT:
1398 		if (!nowayout)
1399 			ident.options |= WDIOF_MAGICCLOSE;
1400 		if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
1401 			ret = -EFAULT;
1402 		break;
1403 
1404 	case WDIOC_GETSTATUS:
1405 		val = data->watchdog_caused_reboot ? WDIOF_CARDRESET : 0;
1406 		ret = put_user(val, (int __user *)arg);
1407 		break;
1408 
1409 	case WDIOC_GETBOOTSTATUS:
1410 		ret = put_user(0, (int __user *)arg);
1411 		break;
1412 
1413 	case WDIOC_KEEPALIVE:
1414 		ret = watchdog_trigger(data);
1415 		break;
1416 
1417 	case WDIOC_GETTIMEOUT:
1418 		val = watchdog_get_timeout(data);
1419 		ret = put_user(val, (int __user *)arg);
1420 		break;
1421 
1422 	case WDIOC_SETTIMEOUT:
1423 		if (get_user(val, (int __user *)arg)) {
1424 			ret = -EFAULT;
1425 			break;
1426 		}
1427 		ret = watchdog_set_timeout(data, val);
1428 		if (ret > 0)
1429 			ret = put_user(ret, (int __user *)arg);
1430 		break;
1431 
1432 	case WDIOC_SETOPTIONS:
1433 		if (get_user(val, (int __user *)arg)) {
1434 			ret = -EFAULT;
1435 			break;
1436 		}
1437 
1438 		if (val & WDIOS_DISABLECARD)
1439 			ret = watchdog_disable(data);
1440 		else if (val & WDIOS_ENABLECARD)
1441 			ret = watchdog_enable(data);
1442 		else
1443 			ret = -EINVAL;
1444 
1445 		break;
1446 	default:
1447 		ret = -ENOTTY;
1448 	}
1449 	return ret;
1450 }
1451 
1452 static const struct file_operations watchdog_fops = {
1453 	.owner = THIS_MODULE,
1454 	.llseek = no_llseek,
1455 	.open = watchdog_open,
1456 	.release = watchdog_close,
1457 	.write = watchdog_write,
1458 	.unlocked_ioctl = watchdog_ioctl,
1459 	.compat_ioctl = compat_ptr_ioctl,
1460 };
1461 
1462 /*
1463  *	Notifier for system down
1464  */
1465 
watchdog_notify_sys(struct notifier_block * this,unsigned long code,void * unused)1466 static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
1467 			       void *unused)
1468 {
1469 	struct w83793_data *data = NULL;
1470 
1471 	if (code == SYS_DOWN || code == SYS_HALT) {
1472 
1473 		/* Disable each registered watchdog */
1474 		mutex_lock(&watchdog_data_mutex);
1475 		list_for_each_entry(data, &watchdog_data_list, list) {
1476 			if (data->watchdog_miscdev.minor)
1477 				watchdog_disable(data);
1478 		}
1479 		mutex_unlock(&watchdog_data_mutex);
1480 	}
1481 
1482 	return NOTIFY_DONE;
1483 }
1484 
1485 /*
1486  *	The WDT needs to learn about soft shutdowns in order to
1487  *	turn the timebomb registers off.
1488  */
1489 
1490 static struct notifier_block watchdog_notifier = {
1491 	.notifier_call = watchdog_notify_sys,
1492 };
1493 
1494 /*
1495  * Init / remove routines
1496  */
1497 
w83793_remove(struct i2c_client * client)1498 static int w83793_remove(struct i2c_client *client)
1499 {
1500 	struct w83793_data *data = i2c_get_clientdata(client);
1501 	struct device *dev = &client->dev;
1502 	int i, tmp;
1503 
1504 	/* Unregister the watchdog (if registered) */
1505 	if (data->watchdog_miscdev.minor) {
1506 		misc_deregister(&data->watchdog_miscdev);
1507 
1508 		if (data->watchdog_is_open) {
1509 			dev_warn(&client->dev,
1510 				"i2c client detached with watchdog open! "
1511 				"Stopping watchdog.\n");
1512 			watchdog_disable(data);
1513 		}
1514 
1515 		mutex_lock(&watchdog_data_mutex);
1516 		list_del(&data->list);
1517 		mutex_unlock(&watchdog_data_mutex);
1518 
1519 		/* Tell the watchdog code the client is gone */
1520 		mutex_lock(&data->watchdog_lock);
1521 		data->client = NULL;
1522 		mutex_unlock(&data->watchdog_lock);
1523 	}
1524 
1525 	/* Reset Configuration Register to Disable Watch Dog Registers */
1526 	tmp = w83793_read_value(client, W83793_REG_CONFIG);
1527 	w83793_write_value(client, W83793_REG_CONFIG, tmp & ~0x04);
1528 
1529 	unregister_reboot_notifier(&watchdog_notifier);
1530 
1531 	hwmon_device_unregister(data->hwmon_dev);
1532 
1533 	for (i = 0; i < ARRAY_SIZE(w83793_sensor_attr_2); i++)
1534 		device_remove_file(dev,
1535 				   &w83793_sensor_attr_2[i].dev_attr);
1536 
1537 	for (i = 0; i < ARRAY_SIZE(sda_single_files); i++)
1538 		device_remove_file(dev, &sda_single_files[i].dev_attr);
1539 
1540 	for (i = 0; i < ARRAY_SIZE(w83793_vid); i++)
1541 		device_remove_file(dev, &w83793_vid[i].dev_attr);
1542 	device_remove_file(dev, &dev_attr_vrm);
1543 
1544 	for (i = 0; i < ARRAY_SIZE(w83793_left_fan); i++)
1545 		device_remove_file(dev, &w83793_left_fan[i].dev_attr);
1546 
1547 	for (i = 0; i < ARRAY_SIZE(w83793_left_pwm); i++)
1548 		device_remove_file(dev, &w83793_left_pwm[i].dev_attr);
1549 
1550 	for (i = 0; i < ARRAY_SIZE(w83793_temp); i++)
1551 		device_remove_file(dev, &w83793_temp[i].dev_attr);
1552 
1553 	/* Decrease data reference counter */
1554 	mutex_lock(&watchdog_data_mutex);
1555 	kref_put(&data->kref, w83793_release_resources);
1556 	mutex_unlock(&watchdog_data_mutex);
1557 
1558 	return 0;
1559 }
1560 
1561 static int
w83793_detect_subclients(struct i2c_client * client)1562 w83793_detect_subclients(struct i2c_client *client)
1563 {
1564 	int i, id;
1565 	int address = client->addr;
1566 	u8 tmp;
1567 	struct i2c_adapter *adapter = client->adapter;
1568 
1569 	id = i2c_adapter_id(adapter);
1570 	if (force_subclients[0] == id && force_subclients[1] == address) {
1571 		for (i = 2; i <= 3; i++) {
1572 			if (force_subclients[i] < 0x48
1573 			    || force_subclients[i] > 0x4f) {
1574 				dev_err(&client->dev,
1575 					"invalid subclient "
1576 					"address %d; must be 0x48-0x4f\n",
1577 					force_subclients[i]);
1578 				return -EINVAL;
1579 			}
1580 		}
1581 		w83793_write_value(client, W83793_REG_I2C_SUBADDR,
1582 				   (force_subclients[2] & 0x07) |
1583 				   ((force_subclients[3] & 0x07) << 4));
1584 	}
1585 
1586 	tmp = w83793_read_value(client, W83793_REG_I2C_SUBADDR);
1587 
1588 	if (!(tmp & 0x88) && (tmp & 0x7) == ((tmp >> 4) & 0x7)) {
1589 		dev_err(&client->dev,
1590 			"duplicate addresses 0x%x, use force_subclient\n", 0x48 + (tmp & 0x7));
1591 		return -ENODEV;
1592 	}
1593 
1594 	if (!(tmp & 0x08))
1595 		devm_i2c_new_dummy_device(&client->dev, adapter, 0x48 + (tmp & 0x7));
1596 
1597 	if (!(tmp & 0x80))
1598 		devm_i2c_new_dummy_device(&client->dev, adapter, 0x48 + ((tmp >> 4) & 0x7));
1599 
1600 	return 0;
1601 }
1602 
1603 /* Return 0 if detection is successful, -ENODEV otherwise */
w83793_detect(struct i2c_client * client,struct i2c_board_info * info)1604 static int w83793_detect(struct i2c_client *client,
1605 			 struct i2c_board_info *info)
1606 {
1607 	u8 tmp, bank, chip_id;
1608 	struct i2c_adapter *adapter = client->adapter;
1609 	unsigned short address = client->addr;
1610 
1611 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1612 		return -ENODEV;
1613 
1614 	bank = i2c_smbus_read_byte_data(client, W83793_REG_BANKSEL);
1615 
1616 	tmp = bank & 0x80 ? 0x5c : 0xa3;
1617 	/* Check Winbond vendor ID */
1618 	if (tmp != i2c_smbus_read_byte_data(client, W83793_REG_VENDORID)) {
1619 		pr_debug("w83793: Detection failed at check vendor id\n");
1620 		return -ENODEV;
1621 	}
1622 
1623 	/*
1624 	 * If Winbond chip, address of chip and W83793_REG_I2C_ADDR
1625 	 * should match
1626 	 */
1627 	if ((bank & 0x07) == 0
1628 	 && i2c_smbus_read_byte_data(client, W83793_REG_I2C_ADDR) !=
1629 	    (address << 1)) {
1630 		pr_debug("w83793: Detection failed at check i2c addr\n");
1631 		return -ENODEV;
1632 	}
1633 
1634 	/* Determine the chip type now */
1635 	chip_id = i2c_smbus_read_byte_data(client, W83793_REG_CHIPID);
1636 	if (chip_id != 0x7b)
1637 		return -ENODEV;
1638 
1639 	strlcpy(info->type, "w83793", I2C_NAME_SIZE);
1640 
1641 	return 0;
1642 }
1643 
w83793_probe(struct i2c_client * client)1644 static int w83793_probe(struct i2c_client *client)
1645 {
1646 	struct device *dev = &client->dev;
1647 	static const int watchdog_minors[] = {
1648 		WATCHDOG_MINOR, 212, 213, 214, 215
1649 	};
1650 	struct w83793_data *data;
1651 	int i, tmp, val, err;
1652 	int files_fan = ARRAY_SIZE(w83793_left_fan) / 7;
1653 	int files_pwm = ARRAY_SIZE(w83793_left_pwm) / 5;
1654 	int files_temp = ARRAY_SIZE(w83793_temp) / 6;
1655 
1656 	data = kzalloc(sizeof(struct w83793_data), GFP_KERNEL);
1657 	if (!data) {
1658 		err = -ENOMEM;
1659 		goto exit;
1660 	}
1661 
1662 	i2c_set_clientdata(client, data);
1663 	data->bank = i2c_smbus_read_byte_data(client, W83793_REG_BANKSEL);
1664 	mutex_init(&data->update_lock);
1665 	mutex_init(&data->watchdog_lock);
1666 	INIT_LIST_HEAD(&data->list);
1667 	kref_init(&data->kref);
1668 
1669 	/*
1670 	 * Store client pointer in our data struct for watchdog usage
1671 	 * (where the client is found through a data ptr instead of the
1672 	 * otherway around)
1673 	 */
1674 	data->client = client;
1675 
1676 	err = w83793_detect_subclients(client);
1677 	if (err)
1678 		goto free_mem;
1679 
1680 	/* Initialize the chip */
1681 	w83793_init_client(client);
1682 
1683 	/*
1684 	 * Only fan 1-5 has their own input pins,
1685 	 * Pwm 1-3 has their own pins
1686 	 */
1687 	data->has_fan = 0x1f;
1688 	data->has_pwm = 0x07;
1689 	tmp = w83793_read_value(client, W83793_REG_MFC);
1690 	val = w83793_read_value(client, W83793_REG_FANIN_CTRL);
1691 
1692 	/* check the function of pins 49-56 */
1693 	if (tmp & 0x80) {
1694 		data->has_vid |= 0x2;	/* has VIDB */
1695 	} else {
1696 		data->has_pwm |= 0x18;	/* pwm 4,5 */
1697 		if (val & 0x01) {	/* fan 6 */
1698 			data->has_fan |= 0x20;
1699 			data->has_pwm |= 0x20;
1700 		}
1701 		if (val & 0x02) {	/* fan 7 */
1702 			data->has_fan |= 0x40;
1703 			data->has_pwm |= 0x40;
1704 		}
1705 		if (!(tmp & 0x40) && (val & 0x04)) {	/* fan 8 */
1706 			data->has_fan |= 0x80;
1707 			data->has_pwm |= 0x80;
1708 		}
1709 	}
1710 
1711 	/* check the function of pins 37-40 */
1712 	if (!(tmp & 0x29))
1713 		data->has_vid |= 0x1;	/* has VIDA */
1714 	if (0x08 == (tmp & 0x0c)) {
1715 		if (val & 0x08)	/* fan 9 */
1716 			data->has_fan |= 0x100;
1717 		if (val & 0x10)	/* fan 10 */
1718 			data->has_fan |= 0x200;
1719 	}
1720 	if (0x20 == (tmp & 0x30)) {
1721 		if (val & 0x20)	/* fan 11 */
1722 			data->has_fan |= 0x400;
1723 		if (val & 0x40)	/* fan 12 */
1724 			data->has_fan |= 0x800;
1725 	}
1726 
1727 	if ((tmp & 0x01) && (val & 0x04)) {	/* fan 8, second location */
1728 		data->has_fan |= 0x80;
1729 		data->has_pwm |= 0x80;
1730 	}
1731 
1732 	tmp = w83793_read_value(client, W83793_REG_FANIN_SEL);
1733 	if ((tmp & 0x01) && (val & 0x08)) {	/* fan 9, second location */
1734 		data->has_fan |= 0x100;
1735 	}
1736 	if ((tmp & 0x02) && (val & 0x10)) {	/* fan 10, second location */
1737 		data->has_fan |= 0x200;
1738 	}
1739 	if ((tmp & 0x04) && (val & 0x20)) {	/* fan 11, second location */
1740 		data->has_fan |= 0x400;
1741 	}
1742 	if ((tmp & 0x08) && (val & 0x40)) {	/* fan 12, second location */
1743 		data->has_fan |= 0x800;
1744 	}
1745 
1746 	/* check the temp1-6 mode, ignore former AMDSI selected inputs */
1747 	tmp = w83793_read_value(client, W83793_REG_TEMP_MODE[0]);
1748 	if (tmp & 0x01)
1749 		data->has_temp |= 0x01;
1750 	if (tmp & 0x04)
1751 		data->has_temp |= 0x02;
1752 	if (tmp & 0x10)
1753 		data->has_temp |= 0x04;
1754 	if (tmp & 0x40)
1755 		data->has_temp |= 0x08;
1756 
1757 	tmp = w83793_read_value(client, W83793_REG_TEMP_MODE[1]);
1758 	if (tmp & 0x01)
1759 		data->has_temp |= 0x10;
1760 	if (tmp & 0x02)
1761 		data->has_temp |= 0x20;
1762 
1763 	/* Register sysfs hooks */
1764 	for (i = 0; i < ARRAY_SIZE(w83793_sensor_attr_2); i++) {
1765 		err = device_create_file(dev,
1766 					 &w83793_sensor_attr_2[i].dev_attr);
1767 		if (err)
1768 			goto exit_remove;
1769 	}
1770 
1771 	for (i = 0; i < ARRAY_SIZE(w83793_vid); i++) {
1772 		if (!(data->has_vid & (1 << i)))
1773 			continue;
1774 		err = device_create_file(dev, &w83793_vid[i].dev_attr);
1775 		if (err)
1776 			goto exit_remove;
1777 	}
1778 	if (data->has_vid) {
1779 		data->vrm = vid_which_vrm();
1780 		err = device_create_file(dev, &dev_attr_vrm);
1781 		if (err)
1782 			goto exit_remove;
1783 	}
1784 
1785 	for (i = 0; i < ARRAY_SIZE(sda_single_files); i++) {
1786 		err = device_create_file(dev, &sda_single_files[i].dev_attr);
1787 		if (err)
1788 			goto exit_remove;
1789 
1790 	}
1791 
1792 	for (i = 0; i < 6; i++) {
1793 		int j;
1794 		if (!(data->has_temp & (1 << i)))
1795 			continue;
1796 		for (j = 0; j < files_temp; j++) {
1797 			err = device_create_file(dev,
1798 						&w83793_temp[(i) * files_temp
1799 								+ j].dev_attr);
1800 			if (err)
1801 				goto exit_remove;
1802 		}
1803 	}
1804 
1805 	for (i = 5; i < 12; i++) {
1806 		int j;
1807 		if (!(data->has_fan & (1 << i)))
1808 			continue;
1809 		for (j = 0; j < files_fan; j++) {
1810 			err = device_create_file(dev,
1811 					   &w83793_left_fan[(i - 5) * files_fan
1812 								+ j].dev_attr);
1813 			if (err)
1814 				goto exit_remove;
1815 		}
1816 	}
1817 
1818 	for (i = 3; i < 8; i++) {
1819 		int j;
1820 		if (!(data->has_pwm & (1 << i)))
1821 			continue;
1822 		for (j = 0; j < files_pwm; j++) {
1823 			err = device_create_file(dev,
1824 					   &w83793_left_pwm[(i - 3) * files_pwm
1825 								+ j].dev_attr);
1826 			if (err)
1827 				goto exit_remove;
1828 		}
1829 	}
1830 
1831 	data->hwmon_dev = hwmon_device_register(dev);
1832 	if (IS_ERR(data->hwmon_dev)) {
1833 		err = PTR_ERR(data->hwmon_dev);
1834 		goto exit_remove;
1835 	}
1836 
1837 	/* Watchdog initialization */
1838 
1839 	/* Register boot notifier */
1840 	err = register_reboot_notifier(&watchdog_notifier);
1841 	if (err != 0) {
1842 		dev_err(&client->dev,
1843 			"cannot register reboot notifier (err=%d)\n", err);
1844 		goto exit_devunreg;
1845 	}
1846 
1847 	/*
1848 	 * Enable Watchdog registers.
1849 	 * Set Configuration Register to Enable Watch Dog Registers
1850 	 * (Bit 2) = XXXX, X1XX.
1851 	 */
1852 	tmp = w83793_read_value(client, W83793_REG_CONFIG);
1853 	w83793_write_value(client, W83793_REG_CONFIG, tmp | 0x04);
1854 
1855 	/* Set the default watchdog timeout */
1856 	data->watchdog_timeout = timeout;
1857 
1858 	/* Check, if last reboot was caused by watchdog */
1859 	data->watchdog_caused_reboot =
1860 	  w83793_read_value(data->client, W83793_REG_WDT_STATUS) & 0x01;
1861 
1862 	/* Disable Soft Watchdog during initialiation */
1863 	watchdog_disable(data);
1864 
1865 	/*
1866 	 * We take the data_mutex lock early so that watchdog_open() cannot
1867 	 * run when misc_register() has completed, but we've not yet added
1868 	 * our data to the watchdog_data_list (and set the default timeout)
1869 	 */
1870 	mutex_lock(&watchdog_data_mutex);
1871 	for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
1872 		/* Register our watchdog part */
1873 		snprintf(data->watchdog_name, sizeof(data->watchdog_name),
1874 			"watchdog%c", (i == 0) ? '\0' : ('0' + i));
1875 		data->watchdog_miscdev.name = data->watchdog_name;
1876 		data->watchdog_miscdev.fops = &watchdog_fops;
1877 		data->watchdog_miscdev.minor = watchdog_minors[i];
1878 
1879 		err = misc_register(&data->watchdog_miscdev);
1880 		if (err == -EBUSY)
1881 			continue;
1882 		if (err) {
1883 			data->watchdog_miscdev.minor = 0;
1884 			dev_err(&client->dev,
1885 				"Registering watchdog chardev: %d\n", err);
1886 			break;
1887 		}
1888 
1889 		list_add(&data->list, &watchdog_data_list);
1890 
1891 		dev_info(&client->dev,
1892 			"Registered watchdog chardev major 10, minor: %d\n",
1893 			watchdog_minors[i]);
1894 		break;
1895 	}
1896 	if (i == ARRAY_SIZE(watchdog_minors)) {
1897 		data->watchdog_miscdev.minor = 0;
1898 		dev_warn(&client->dev,
1899 			 "Couldn't register watchdog chardev (due to no free minor)\n");
1900 	}
1901 
1902 	mutex_unlock(&watchdog_data_mutex);
1903 
1904 	return 0;
1905 
1906 	/* Unregister hwmon device */
1907 
1908 exit_devunreg:
1909 
1910 	hwmon_device_unregister(data->hwmon_dev);
1911 
1912 	/* Unregister sysfs hooks */
1913 
1914 exit_remove:
1915 	for (i = 0; i < ARRAY_SIZE(w83793_sensor_attr_2); i++)
1916 		device_remove_file(dev, &w83793_sensor_attr_2[i].dev_attr);
1917 
1918 	for (i = 0; i < ARRAY_SIZE(sda_single_files); i++)
1919 		device_remove_file(dev, &sda_single_files[i].dev_attr);
1920 
1921 	for (i = 0; i < ARRAY_SIZE(w83793_vid); i++)
1922 		device_remove_file(dev, &w83793_vid[i].dev_attr);
1923 
1924 	for (i = 0; i < ARRAY_SIZE(w83793_left_fan); i++)
1925 		device_remove_file(dev, &w83793_left_fan[i].dev_attr);
1926 
1927 	for (i = 0; i < ARRAY_SIZE(w83793_left_pwm); i++)
1928 		device_remove_file(dev, &w83793_left_pwm[i].dev_attr);
1929 
1930 	for (i = 0; i < ARRAY_SIZE(w83793_temp); i++)
1931 		device_remove_file(dev, &w83793_temp[i].dev_attr);
1932 free_mem:
1933 	kfree(data);
1934 exit:
1935 	return err;
1936 }
1937 
w83793_update_nonvolatile(struct device * dev)1938 static void w83793_update_nonvolatile(struct device *dev)
1939 {
1940 	struct i2c_client *client = to_i2c_client(dev);
1941 	struct w83793_data *data = i2c_get_clientdata(client);
1942 	int i, j;
1943 	/*
1944 	 * They are somewhat "stable" registers, and to update them every time
1945 	 * takes so much time, it's just not worthy. Update them in a long
1946 	 * interval to avoid exception.
1947 	 */
1948 	if (!(time_after(jiffies, data->last_nonvolatile + HZ * 300)
1949 	      || !data->valid))
1950 		return;
1951 	/* update voltage limits */
1952 	for (i = 1; i < 3; i++) {
1953 		for (j = 0; j < ARRAY_SIZE(data->in); j++) {
1954 			data->in[j][i] =
1955 			    w83793_read_value(client, W83793_REG_IN[j][i]);
1956 		}
1957 		data->in_low_bits[i] =
1958 		    w83793_read_value(client, W83793_REG_IN_LOW_BITS[i]);
1959 	}
1960 
1961 	for (i = 0; i < ARRAY_SIZE(data->fan_min); i++) {
1962 		/* Update the Fan measured value and limits */
1963 		if (!(data->has_fan & (1 << i)))
1964 			continue;
1965 		data->fan_min[i] =
1966 		    w83793_read_value(client, W83793_REG_FAN_MIN(i)) << 8;
1967 		data->fan_min[i] |=
1968 		    w83793_read_value(client, W83793_REG_FAN_MIN(i) + 1);
1969 	}
1970 
1971 	for (i = 0; i < ARRAY_SIZE(data->temp_fan_map); i++) {
1972 		if (!(data->has_temp & (1 << i)))
1973 			continue;
1974 		data->temp_fan_map[i] =
1975 		    w83793_read_value(client, W83793_REG_TEMP_FAN_MAP(i));
1976 		for (j = 1; j < 5; j++) {
1977 			data->temp[i][j] =
1978 			    w83793_read_value(client, W83793_REG_TEMP[i][j]);
1979 		}
1980 		data->temp_cruise[i] =
1981 		    w83793_read_value(client, W83793_REG_TEMP_CRUISE(i));
1982 		for (j = 0; j < 7; j++) {
1983 			data->sf2_pwm[i][j] =
1984 			    w83793_read_value(client, W83793_REG_SF2_PWM(i, j));
1985 			data->sf2_temp[i][j] =
1986 			    w83793_read_value(client,
1987 					      W83793_REG_SF2_TEMP(i, j));
1988 		}
1989 	}
1990 
1991 	for (i = 0; i < ARRAY_SIZE(data->temp_mode); i++)
1992 		data->temp_mode[i] =
1993 		    w83793_read_value(client, W83793_REG_TEMP_MODE[i]);
1994 
1995 	for (i = 0; i < ARRAY_SIZE(data->tolerance); i++) {
1996 		data->tolerance[i] =
1997 		    w83793_read_value(client, W83793_REG_TEMP_TOL(i));
1998 	}
1999 
2000 	for (i = 0; i < ARRAY_SIZE(data->pwm); i++) {
2001 		if (!(data->has_pwm & (1 << i)))
2002 			continue;
2003 		data->pwm[i][PWM_NONSTOP] =
2004 		    w83793_read_value(client, W83793_REG_PWM(i, PWM_NONSTOP));
2005 		data->pwm[i][PWM_START] =
2006 		    w83793_read_value(client, W83793_REG_PWM(i, PWM_START));
2007 		data->pwm_stop_time[i] =
2008 		    w83793_read_value(client, W83793_REG_PWM_STOP_TIME(i));
2009 	}
2010 
2011 	data->pwm_default = w83793_read_value(client, W83793_REG_PWM_DEFAULT);
2012 	data->pwm_enable = w83793_read_value(client, W83793_REG_PWM_ENABLE);
2013 	data->pwm_uptime = w83793_read_value(client, W83793_REG_PWM_UPTIME);
2014 	data->pwm_downtime = w83793_read_value(client, W83793_REG_PWM_DOWNTIME);
2015 	data->temp_critical =
2016 	    w83793_read_value(client, W83793_REG_TEMP_CRITICAL);
2017 	data->beep_enable = w83793_read_value(client, W83793_REG_OVT_BEEP);
2018 
2019 	for (i = 0; i < ARRAY_SIZE(data->beeps); i++)
2020 		data->beeps[i] = w83793_read_value(client, W83793_REG_BEEP(i));
2021 
2022 	data->last_nonvolatile = jiffies;
2023 }
2024 
w83793_update_device(struct device * dev)2025 static struct w83793_data *w83793_update_device(struct device *dev)
2026 {
2027 	struct i2c_client *client = to_i2c_client(dev);
2028 	struct w83793_data *data = i2c_get_clientdata(client);
2029 	int i;
2030 
2031 	mutex_lock(&data->update_lock);
2032 
2033 	if (!(time_after(jiffies, data->last_updated + HZ * 2)
2034 	      || !data->valid))
2035 		goto END;
2036 
2037 	/* Update the voltages measured value and limits */
2038 	for (i = 0; i < ARRAY_SIZE(data->in); i++)
2039 		data->in[i][IN_READ] =
2040 		    w83793_read_value(client, W83793_REG_IN[i][IN_READ]);
2041 
2042 	data->in_low_bits[IN_READ] =
2043 	    w83793_read_value(client, W83793_REG_IN_LOW_BITS[IN_READ]);
2044 
2045 	for (i = 0; i < ARRAY_SIZE(data->fan); i++) {
2046 		if (!(data->has_fan & (1 << i)))
2047 			continue;
2048 		data->fan[i] =
2049 		    w83793_read_value(client, W83793_REG_FAN(i)) << 8;
2050 		data->fan[i] |=
2051 		    w83793_read_value(client, W83793_REG_FAN(i) + 1);
2052 	}
2053 
2054 	for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
2055 		if (!(data->has_temp & (1 << i)))
2056 			continue;
2057 		data->temp[i][TEMP_READ] =
2058 		    w83793_read_value(client, W83793_REG_TEMP[i][TEMP_READ]);
2059 	}
2060 
2061 	data->temp_low_bits =
2062 	    w83793_read_value(client, W83793_REG_TEMP_LOW_BITS);
2063 
2064 	for (i = 0; i < ARRAY_SIZE(data->pwm); i++) {
2065 		if (data->has_pwm & (1 << i))
2066 			data->pwm[i][PWM_DUTY] =
2067 			    w83793_read_value(client,
2068 					      W83793_REG_PWM(i, PWM_DUTY));
2069 	}
2070 
2071 	for (i = 0; i < ARRAY_SIZE(data->alarms); i++)
2072 		data->alarms[i] =
2073 		    w83793_read_value(client, W83793_REG_ALARM(i));
2074 	if (data->has_vid & 0x01)
2075 		data->vid[0] = w83793_read_value(client, W83793_REG_VID_INA);
2076 	if (data->has_vid & 0x02)
2077 		data->vid[1] = w83793_read_value(client, W83793_REG_VID_INB);
2078 	w83793_update_nonvolatile(dev);
2079 	data->last_updated = jiffies;
2080 	data->valid = true;
2081 
2082 END:
2083 	mutex_unlock(&data->update_lock);
2084 	return data;
2085 }
2086 
2087 /*
2088  * Ignore the possibility that somebody change bank outside the driver
2089  * Must be called with data->update_lock held, except during initialization
2090  */
w83793_read_value(struct i2c_client * client,u16 reg)2091 static u8 w83793_read_value(struct i2c_client *client, u16 reg)
2092 {
2093 	struct w83793_data *data = i2c_get_clientdata(client);
2094 	u8 res;
2095 	u8 new_bank = reg >> 8;
2096 
2097 	new_bank |= data->bank & 0xfc;
2098 	if (data->bank != new_bank) {
2099 		if (i2c_smbus_write_byte_data
2100 		    (client, W83793_REG_BANKSEL, new_bank) >= 0)
2101 			data->bank = new_bank;
2102 		else {
2103 			dev_err(&client->dev,
2104 				"set bank to %d failed, fall back "
2105 				"to bank %d, read reg 0x%x error\n",
2106 				new_bank, data->bank, reg);
2107 			res = 0x0;	/* read 0x0 from the chip */
2108 			goto END;
2109 		}
2110 	}
2111 	res = i2c_smbus_read_byte_data(client, reg & 0xff);
2112 END:
2113 	return res;
2114 }
2115 
2116 /* Must be called with data->update_lock held, except during initialization */
w83793_write_value(struct i2c_client * client,u16 reg,u8 value)2117 static int w83793_write_value(struct i2c_client *client, u16 reg, u8 value)
2118 {
2119 	struct w83793_data *data = i2c_get_clientdata(client);
2120 	int res;
2121 	u8 new_bank = reg >> 8;
2122 
2123 	new_bank |= data->bank & 0xfc;
2124 	if (data->bank != new_bank) {
2125 		res = i2c_smbus_write_byte_data(client, W83793_REG_BANKSEL,
2126 						new_bank);
2127 		if (res < 0) {
2128 			dev_err(&client->dev,
2129 				"set bank to %d failed, fall back "
2130 				"to bank %d, write reg 0x%x error\n",
2131 				new_bank, data->bank, reg);
2132 			goto END;
2133 		}
2134 		data->bank = new_bank;
2135 	}
2136 
2137 	res = i2c_smbus_write_byte_data(client, reg & 0xff, value);
2138 END:
2139 	return res;
2140 }
2141 
2142 module_i2c_driver(w83793_driver);
2143 
2144 MODULE_AUTHOR("Yuan Mu, Sven Anders");
2145 MODULE_DESCRIPTION("w83793 driver");
2146 MODULE_LICENSE("GPL");
2147