1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * w83l786ng.c - Linux kernel driver for hardware monitoring
4 * Copyright (c) 2007 Kevin Lo <kevlo@kevlo.org>
5 */
6
7 /*
8 * Supports following chips:
9 *
10 * Chip #vin #fanin #pwm #temp wchipid vendid i2c ISA
11 * w83l786ng 3 2 2 2 0x7b 0x5ca3 yes no
12 */
13
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/i2c.h>
18 #include <linux/hwmon.h>
19 #include <linux/hwmon-sysfs.h>
20 #include <linux/err.h>
21 #include <linux/mutex.h>
22 #include <linux/jiffies.h>
23
24 /* Addresses to scan */
25 static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END };
26
27 /* Insmod parameters */
28
29 static bool reset;
30 module_param(reset, bool, 0);
31 MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");
32
33 #define W83L786NG_REG_IN_MIN(nr) (0x2C + (nr) * 2)
34 #define W83L786NG_REG_IN_MAX(nr) (0x2B + (nr) * 2)
35 #define W83L786NG_REG_IN(nr) ((nr) + 0x20)
36
37 #define W83L786NG_REG_FAN(nr) ((nr) + 0x28)
38 #define W83L786NG_REG_FAN_MIN(nr) ((nr) + 0x3B)
39
40 #define W83L786NG_REG_CONFIG 0x40
41 #define W83L786NG_REG_ALARM1 0x41
42 #define W83L786NG_REG_ALARM2 0x42
43 #define W83L786NG_REG_GPIO_EN 0x47
44 #define W83L786NG_REG_MAN_ID2 0x4C
45 #define W83L786NG_REG_MAN_ID1 0x4D
46 #define W83L786NG_REG_CHIP_ID 0x4E
47
48 #define W83L786NG_REG_DIODE 0x53
49 #define W83L786NG_REG_FAN_DIV 0x54
50 #define W83L786NG_REG_FAN_CFG 0x80
51
52 #define W83L786NG_REG_TOLERANCE 0x8D
53
54 static const u8 W83L786NG_REG_TEMP[2][3] = {
55 { 0x25, /* TEMP 0 in DataSheet */
56 0x35, /* TEMP 0 Over in DataSheet */
57 0x36 }, /* TEMP 0 Hyst in DataSheet */
58 { 0x26, /* TEMP 1 in DataSheet */
59 0x37, /* TEMP 1 Over in DataSheet */
60 0x38 } /* TEMP 1 Hyst in DataSheet */
61 };
62
63 static const u8 W83L786NG_PWM_MODE_SHIFT[] = {6, 7};
64 static const u8 W83L786NG_PWM_ENABLE_SHIFT[] = {2, 4};
65
66 /* FAN Duty Cycle, be used to control */
67 static const u8 W83L786NG_REG_PWM[] = {0x81, 0x87};
68
69
70 static inline u8
FAN_TO_REG(long rpm,int div)71 FAN_TO_REG(long rpm, int div)
72 {
73 if (rpm == 0)
74 return 255;
75 rpm = clamp_val(rpm, 1, 1000000);
76 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
77 }
78
79 #define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \
80 ((val) == 255 ? 0 : \
81 1350000 / ((val) * (div))))
82
83 /* for temp */
84 #define TEMP_TO_REG(val) (clamp_val(((val) < 0 ? (val) + 0x100 * 1000 \
85 : (val)) / 1000, 0, 0xff))
86 #define TEMP_FROM_REG(val) (((val) & 0x80 ? \
87 (val) - 0x100 : (val)) * 1000)
88
89 /*
90 * The analog voltage inputs have 8mV LSB. Since the sysfs output is
91 * in mV as would be measured on the chip input pin, need to just
92 * multiply/divide by 8 to translate from/to register values.
93 */
94 #define IN_TO_REG(val) (clamp_val((((val) + 4) / 8), 0, 255))
95 #define IN_FROM_REG(val) ((val) * 8)
96
97 #define DIV_FROM_REG(val) (1 << (val))
98
99 static inline u8
DIV_TO_REG(long val)100 DIV_TO_REG(long val)
101 {
102 int i;
103 val = clamp_val(val, 1, 128) >> 1;
104 for (i = 0; i < 7; i++) {
105 if (val == 0)
106 break;
107 val >>= 1;
108 }
109 return (u8)i;
110 }
111
112 struct w83l786ng_data {
113 struct i2c_client *client;
114 struct mutex update_lock;
115 bool valid; /* true if following fields are valid */
116 unsigned long last_updated; /* In jiffies */
117 unsigned long last_nonvolatile; /* In jiffies, last time we update the
118 * nonvolatile registers */
119
120 u8 in[3];
121 u8 in_max[3];
122 u8 in_min[3];
123 u8 fan[2];
124 u8 fan_div[2];
125 u8 fan_min[2];
126 u8 temp_type[2];
127 u8 temp[2][3];
128 u8 pwm[2];
129 u8 pwm_mode[2]; /* 0->DC variable voltage
130 * 1->PWM variable duty cycle */
131
132 u8 pwm_enable[2]; /* 1->manual
133 * 2->thermal cruise (also called SmartFan I) */
134 u8 tolerance[2];
135 };
136
137 static u8
w83l786ng_read_value(struct i2c_client * client,u8 reg)138 w83l786ng_read_value(struct i2c_client *client, u8 reg)
139 {
140 return i2c_smbus_read_byte_data(client, reg);
141 }
142
143 static int
w83l786ng_write_value(struct i2c_client * client,u8 reg,u8 value)144 w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value)
145 {
146 return i2c_smbus_write_byte_data(client, reg, value);
147 }
148
w83l786ng_update_device(struct device * dev)149 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
150 {
151 struct w83l786ng_data *data = dev_get_drvdata(dev);
152 struct i2c_client *client = data->client;
153 int i, j;
154 u8 reg_tmp, pwmcfg;
155
156 mutex_lock(&data->update_lock);
157 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
158 || !data->valid) {
159 dev_dbg(&client->dev, "Updating w83l786ng data.\n");
160
161 /* Update the voltages measured value and limits */
162 for (i = 0; i < 3; i++) {
163 data->in[i] = w83l786ng_read_value(client,
164 W83L786NG_REG_IN(i));
165 data->in_min[i] = w83l786ng_read_value(client,
166 W83L786NG_REG_IN_MIN(i));
167 data->in_max[i] = w83l786ng_read_value(client,
168 W83L786NG_REG_IN_MAX(i));
169 }
170
171 /* Update the fan counts and limits */
172 for (i = 0; i < 2; i++) {
173 data->fan[i] = w83l786ng_read_value(client,
174 W83L786NG_REG_FAN(i));
175 data->fan_min[i] = w83l786ng_read_value(client,
176 W83L786NG_REG_FAN_MIN(i));
177 }
178
179 /* Update the fan divisor */
180 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
181 data->fan_div[0] = reg_tmp & 0x07;
182 data->fan_div[1] = (reg_tmp >> 4) & 0x07;
183
184 pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
185 for (i = 0; i < 2; i++) {
186 data->pwm_mode[i] =
187 ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
188 ? 0 : 1;
189 data->pwm_enable[i] =
190 ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1;
191 data->pwm[i] =
192 (w83l786ng_read_value(client, W83L786NG_REG_PWM[i])
193 & 0x0f) * 0x11;
194 }
195
196
197 /* Update the temperature sensors */
198 for (i = 0; i < 2; i++) {
199 for (j = 0; j < 3; j++) {
200 data->temp[i][j] = w83l786ng_read_value(client,
201 W83L786NG_REG_TEMP[i][j]);
202 }
203 }
204
205 /* Update Smart Fan I/II tolerance */
206 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE);
207 data->tolerance[0] = reg_tmp & 0x0f;
208 data->tolerance[1] = (reg_tmp >> 4) & 0x0f;
209
210 data->last_updated = jiffies;
211 data->valid = true;
212
213 }
214
215 mutex_unlock(&data->update_lock);
216
217 return data;
218 }
219
220 /* following are the sysfs callback functions */
221 #define show_in_reg(reg) \
222 static ssize_t \
223 show_##reg(struct device *dev, struct device_attribute *attr, \
224 char *buf) \
225 { \
226 int nr = to_sensor_dev_attr(attr)->index; \
227 struct w83l786ng_data *data = w83l786ng_update_device(dev); \
228 return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
229 }
230
231 show_in_reg(in)
232 show_in_reg(in_min)
233 show_in_reg(in_max)
234
235 #define store_in_reg(REG, reg) \
236 static ssize_t \
237 store_in_##reg(struct device *dev, struct device_attribute *attr, \
238 const char *buf, size_t count) \
239 { \
240 int nr = to_sensor_dev_attr(attr)->index; \
241 struct w83l786ng_data *data = dev_get_drvdata(dev); \
242 struct i2c_client *client = data->client; \
243 unsigned long val; \
244 int err = kstrtoul(buf, 10, &val); \
245 if (err) \
246 return err; \
247 mutex_lock(&data->update_lock); \
248 data->in_##reg[nr] = IN_TO_REG(val); \
249 w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \
250 data->in_##reg[nr]); \
251 mutex_unlock(&data->update_lock); \
252 return count; \
253 }
254
255 store_in_reg(MIN, min)
256 store_in_reg(MAX, max)
257
258 static struct sensor_device_attribute sda_in_input[] = {
259 SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
260 SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
261 SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
262 };
263
264 static struct sensor_device_attribute sda_in_min[] = {
265 SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
266 SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
267 SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
268 };
269
270 static struct sensor_device_attribute sda_in_max[] = {
271 SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
272 SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
273 SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
274 };
275
276 #define show_fan_reg(reg) \
277 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
278 char *buf) \
279 { \
280 int nr = to_sensor_dev_attr(attr)->index; \
281 struct w83l786ng_data *data = w83l786ng_update_device(dev); \
282 return sprintf(buf, "%d\n", \
283 FAN_FROM_REG(data->reg[nr], DIV_FROM_REG(data->fan_div[nr]))); \
284 }
285
286 show_fan_reg(fan);
287 show_fan_reg(fan_min);
288
289 static ssize_t
store_fan_min(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)290 store_fan_min(struct device *dev, struct device_attribute *attr,
291 const char *buf, size_t count)
292 {
293 int nr = to_sensor_dev_attr(attr)->index;
294 struct w83l786ng_data *data = dev_get_drvdata(dev);
295 struct i2c_client *client = data->client;
296 unsigned long val;
297 int err;
298
299 err = kstrtoul(buf, 10, &val);
300 if (err)
301 return err;
302
303 mutex_lock(&data->update_lock);
304 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
305 w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
306 data->fan_min[nr]);
307 mutex_unlock(&data->update_lock);
308
309 return count;
310 }
311
312 static ssize_t
show_fan_div(struct device * dev,struct device_attribute * attr,char * buf)313 show_fan_div(struct device *dev, struct device_attribute *attr,
314 char *buf)
315 {
316 int nr = to_sensor_dev_attr(attr)->index;
317 struct w83l786ng_data *data = w83l786ng_update_device(dev);
318 return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
319 }
320
321 /*
322 * Note: we save and restore the fan minimum here, because its value is
323 * determined in part by the fan divisor. This follows the principle of
324 * least surprise; the user doesn't expect the fan minimum to change just
325 * because the divisor changed.
326 */
327 static ssize_t
store_fan_div(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)328 store_fan_div(struct device *dev, struct device_attribute *attr,
329 const char *buf, size_t count)
330 {
331 int nr = to_sensor_dev_attr(attr)->index;
332 struct w83l786ng_data *data = dev_get_drvdata(dev);
333 struct i2c_client *client = data->client;
334
335 unsigned long min;
336 u8 tmp_fan_div;
337 u8 fan_div_reg;
338 u8 keep_mask = 0;
339 u8 new_shift = 0;
340
341 unsigned long val;
342 int err;
343
344 err = kstrtoul(buf, 10, &val);
345 if (err)
346 return err;
347
348 /* Save fan_min */
349 mutex_lock(&data->update_lock);
350 min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
351
352 data->fan_div[nr] = DIV_TO_REG(val);
353
354 switch (nr) {
355 case 0:
356 keep_mask = 0xf8;
357 new_shift = 0;
358 break;
359 case 1:
360 keep_mask = 0x8f;
361 new_shift = 4;
362 break;
363 }
364
365 fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV)
366 & keep_mask;
367
368 tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;
369
370 w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV,
371 fan_div_reg | tmp_fan_div);
372
373 /* Restore fan_min */
374 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
375 w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
376 data->fan_min[nr]);
377 mutex_unlock(&data->update_lock);
378
379 return count;
380 }
381
382 static struct sensor_device_attribute sda_fan_input[] = {
383 SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
384 SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
385 };
386
387 static struct sensor_device_attribute sda_fan_min[] = {
388 SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
389 store_fan_min, 0),
390 SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
391 store_fan_min, 1),
392 };
393
394 static struct sensor_device_attribute sda_fan_div[] = {
395 SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div,
396 store_fan_div, 0),
397 SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div,
398 store_fan_div, 1),
399 };
400
401
402 /* read/write the temperature, includes measured value and limits */
403
404 static ssize_t
show_temp(struct device * dev,struct device_attribute * attr,char * buf)405 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
406 {
407 struct sensor_device_attribute_2 *sensor_attr =
408 to_sensor_dev_attr_2(attr);
409 int nr = sensor_attr->nr;
410 int index = sensor_attr->index;
411 struct w83l786ng_data *data = w83l786ng_update_device(dev);
412 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr][index]));
413 }
414
415 static ssize_t
store_temp(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)416 store_temp(struct device *dev, struct device_attribute *attr,
417 const char *buf, size_t count)
418 {
419 struct sensor_device_attribute_2 *sensor_attr =
420 to_sensor_dev_attr_2(attr);
421 int nr = sensor_attr->nr;
422 int index = sensor_attr->index;
423 struct w83l786ng_data *data = dev_get_drvdata(dev);
424 struct i2c_client *client = data->client;
425 long val;
426 int err;
427
428 err = kstrtol(buf, 10, &val);
429 if (err)
430 return err;
431
432 mutex_lock(&data->update_lock);
433 data->temp[nr][index] = TEMP_TO_REG(val);
434 w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index],
435 data->temp[nr][index]);
436 mutex_unlock(&data->update_lock);
437
438 return count;
439 }
440
441 static struct sensor_device_attribute_2 sda_temp_input[] = {
442 SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0),
443 SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0),
444 };
445
446 static struct sensor_device_attribute_2 sda_temp_max[] = {
447 SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
448 show_temp, store_temp, 0, 1),
449 SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
450 show_temp, store_temp, 1, 1),
451 };
452
453 static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
454 SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
455 show_temp, store_temp, 0, 2),
456 SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
457 show_temp, store_temp, 1, 2),
458 };
459
460 #define show_pwm_reg(reg) \
461 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
462 char *buf) \
463 { \
464 struct w83l786ng_data *data = w83l786ng_update_device(dev); \
465 int nr = to_sensor_dev_attr(attr)->index; \
466 return sprintf(buf, "%d\n", data->reg[nr]); \
467 }
468
469 show_pwm_reg(pwm_mode)
show_pwm_reg(pwm_enable)470 show_pwm_reg(pwm_enable)
471 show_pwm_reg(pwm)
472
473 static ssize_t
474 store_pwm_mode(struct device *dev, struct device_attribute *attr,
475 const char *buf, size_t count)
476 {
477 int nr = to_sensor_dev_attr(attr)->index;
478 struct w83l786ng_data *data = dev_get_drvdata(dev);
479 struct i2c_client *client = data->client;
480 u8 reg;
481 unsigned long val;
482 int err;
483
484 err = kstrtoul(buf, 10, &val);
485 if (err)
486 return err;
487
488 if (val > 1)
489 return -EINVAL;
490 mutex_lock(&data->update_lock);
491 data->pwm_mode[nr] = val;
492 reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
493 reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]);
494 if (!val)
495 reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr];
496 w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
497 mutex_unlock(&data->update_lock);
498 return count;
499 }
500
501 static ssize_t
store_pwm(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)502 store_pwm(struct device *dev, struct device_attribute *attr,
503 const char *buf, size_t count)
504 {
505 int nr = to_sensor_dev_attr(attr)->index;
506 struct w83l786ng_data *data = dev_get_drvdata(dev);
507 struct i2c_client *client = data->client;
508 unsigned long val;
509 int err;
510
511 err = kstrtoul(buf, 10, &val);
512 if (err)
513 return err;
514 val = clamp_val(val, 0, 255);
515 val = DIV_ROUND_CLOSEST(val, 0x11);
516
517 mutex_lock(&data->update_lock);
518 data->pwm[nr] = val * 0x11;
519 val |= w83l786ng_read_value(client, W83L786NG_REG_PWM[nr]) & 0xf0;
520 w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
521 mutex_unlock(&data->update_lock);
522 return count;
523 }
524
525 static ssize_t
store_pwm_enable(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)526 store_pwm_enable(struct device *dev, struct device_attribute *attr,
527 const char *buf, size_t count)
528 {
529 int nr = to_sensor_dev_attr(attr)->index;
530 struct w83l786ng_data *data = dev_get_drvdata(dev);
531 struct i2c_client *client = data->client;
532 u8 reg;
533 unsigned long val;
534 int err;
535
536 err = kstrtoul(buf, 10, &val);
537 if (err)
538 return err;
539
540 if (!val || val > 2) /* only modes 1 and 2 are supported */
541 return -EINVAL;
542
543 mutex_lock(&data->update_lock);
544 reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
545 data->pwm_enable[nr] = val;
546 reg &= ~(0x03 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
547 reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
548 w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
549 mutex_unlock(&data->update_lock);
550 return count;
551 }
552
553 static struct sensor_device_attribute sda_pwm[] = {
554 SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0),
555 SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1),
556 };
557
558 static struct sensor_device_attribute sda_pwm_mode[] = {
559 SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
560 store_pwm_mode, 0),
561 SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
562 store_pwm_mode, 1),
563 };
564
565 static struct sensor_device_attribute sda_pwm_enable[] = {
566 SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
567 store_pwm_enable, 0),
568 SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
569 store_pwm_enable, 1),
570 };
571
572 /* For Smart Fan I/Thermal Cruise and Smart Fan II */
573 static ssize_t
show_tolerance(struct device * dev,struct device_attribute * attr,char * buf)574 show_tolerance(struct device *dev, struct device_attribute *attr, char *buf)
575 {
576 int nr = to_sensor_dev_attr(attr)->index;
577 struct w83l786ng_data *data = w83l786ng_update_device(dev);
578 return sprintf(buf, "%ld\n", (long)data->tolerance[nr]);
579 }
580
581 static ssize_t
store_tolerance(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)582 store_tolerance(struct device *dev, struct device_attribute *attr,
583 const char *buf, size_t count)
584 {
585 int nr = to_sensor_dev_attr(attr)->index;
586 struct w83l786ng_data *data = dev_get_drvdata(dev);
587 struct i2c_client *client = data->client;
588 u8 tol_tmp, tol_mask;
589 unsigned long val;
590 int err;
591
592 err = kstrtoul(buf, 10, &val);
593 if (err)
594 return err;
595
596 mutex_lock(&data->update_lock);
597 tol_mask = w83l786ng_read_value(client,
598 W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0);
599 tol_tmp = clamp_val(val, 0, 15);
600 tol_tmp &= 0x0f;
601 data->tolerance[nr] = tol_tmp;
602 if (nr == 1)
603 tol_tmp <<= 4;
604
605 w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE,
606 tol_mask | tol_tmp);
607 mutex_unlock(&data->update_lock);
608 return count;
609 }
610
611 static struct sensor_device_attribute sda_tolerance[] = {
612 SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,
613 show_tolerance, store_tolerance, 0),
614 SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,
615 show_tolerance, store_tolerance, 1),
616 };
617
618
619 #define IN_UNIT_ATTRS(X) \
620 &sda_in_input[X].dev_attr.attr, \
621 &sda_in_min[X].dev_attr.attr, \
622 &sda_in_max[X].dev_attr.attr
623
624 #define FAN_UNIT_ATTRS(X) \
625 &sda_fan_input[X].dev_attr.attr, \
626 &sda_fan_min[X].dev_attr.attr, \
627 &sda_fan_div[X].dev_attr.attr
628
629 #define TEMP_UNIT_ATTRS(X) \
630 &sda_temp_input[X].dev_attr.attr, \
631 &sda_temp_max[X].dev_attr.attr, \
632 &sda_temp_max_hyst[X].dev_attr.attr
633
634 #define PWM_UNIT_ATTRS(X) \
635 &sda_pwm[X].dev_attr.attr, \
636 &sda_pwm_mode[X].dev_attr.attr, \
637 &sda_pwm_enable[X].dev_attr.attr
638
639 #define TOLERANCE_UNIT_ATTRS(X) \
640 &sda_tolerance[X].dev_attr.attr
641
642 static struct attribute *w83l786ng_attrs[] = {
643 IN_UNIT_ATTRS(0),
644 IN_UNIT_ATTRS(1),
645 IN_UNIT_ATTRS(2),
646 FAN_UNIT_ATTRS(0),
647 FAN_UNIT_ATTRS(1),
648 TEMP_UNIT_ATTRS(0),
649 TEMP_UNIT_ATTRS(1),
650 PWM_UNIT_ATTRS(0),
651 PWM_UNIT_ATTRS(1),
652 TOLERANCE_UNIT_ATTRS(0),
653 TOLERANCE_UNIT_ATTRS(1),
654 NULL
655 };
656
657 ATTRIBUTE_GROUPS(w83l786ng);
658
659 static int
w83l786ng_detect(struct i2c_client * client,struct i2c_board_info * info)660 w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info)
661 {
662 struct i2c_adapter *adapter = client->adapter;
663 u16 man_id;
664 u8 chip_id;
665
666 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
667 return -ENODEV;
668
669 /* Detection */
670 if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) {
671 dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n",
672 client->addr);
673 return -ENODEV;
674 }
675
676 /* Identification */
677 man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) +
678 w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2);
679 chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID);
680
681 if (man_id != 0x5CA3 || /* Winbond */
682 chip_id != 0x80) { /* W83L786NG */
683 dev_dbg(&adapter->dev,
684 "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
685 man_id, chip_id);
686 return -ENODEV;
687 }
688
689 strscpy(info->type, "w83l786ng", I2C_NAME_SIZE);
690
691 return 0;
692 }
693
w83l786ng_init_client(struct i2c_client * client)694 static void w83l786ng_init_client(struct i2c_client *client)
695 {
696 u8 tmp;
697
698 if (reset)
699 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80);
700
701 /* Start monitoring */
702 tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG);
703 if (!(tmp & 0x01))
704 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01);
705 }
706
707 static int
w83l786ng_probe(struct i2c_client * client)708 w83l786ng_probe(struct i2c_client *client)
709 {
710 struct device *dev = &client->dev;
711 struct w83l786ng_data *data;
712 struct device *hwmon_dev;
713 int i;
714 u8 reg_tmp;
715
716 data = devm_kzalloc(dev, sizeof(struct w83l786ng_data), GFP_KERNEL);
717 if (!data)
718 return -ENOMEM;
719
720 data->client = client;
721 mutex_init(&data->update_lock);
722
723 /* Initialize the chip */
724 w83l786ng_init_client(client);
725
726 /* A few vars need to be filled upon startup */
727 for (i = 0; i < 2; i++) {
728 data->fan_min[i] = w83l786ng_read_value(client,
729 W83L786NG_REG_FAN_MIN(i));
730 }
731
732 /* Update the fan divisor */
733 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
734 data->fan_div[0] = reg_tmp & 0x07;
735 data->fan_div[1] = (reg_tmp >> 4) & 0x07;
736
737 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
738 data,
739 w83l786ng_groups);
740 return PTR_ERR_OR_ZERO(hwmon_dev);
741 }
742
743 static const struct i2c_device_id w83l786ng_id[] = {
744 { "w83l786ng" },
745 { }
746 };
747 MODULE_DEVICE_TABLE(i2c, w83l786ng_id);
748
749 static struct i2c_driver w83l786ng_driver = {
750 .class = I2C_CLASS_HWMON,
751 .driver = {
752 .name = "w83l786ng",
753 },
754 .probe = w83l786ng_probe,
755 .id_table = w83l786ng_id,
756 .detect = w83l786ng_detect,
757 .address_list = normal_i2c,
758 };
759
760 module_i2c_driver(w83l786ng_driver);
761
762 MODULE_AUTHOR("Kevin Lo");
763 MODULE_DESCRIPTION("w83l786ng driver");
764 MODULE_LICENSE("GPL");
765