Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 */
25static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END };
26
27/* Insmod parameters */
28
29static bool reset;
30module_param(reset, bool, 0);
31MODULE_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
54static 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
63static const u8 W83L786NG_PWM_MODE_SHIFT[] = {6, 7};
64static const u8 W83L786NG_PWM_ENABLE_SHIFT[] = {2, 4};
65
66/* FAN Duty Cycle, be used to control */
67static const u8 W83L786NG_REG_PWM[] = {0x81, 0x87};
68
69
70static inline u8
71FAN_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
79static int fan_from_reg(int val, int div)
80{
81 if (val == 0)
82 return -1;
83 if (val == 255)
84 return 0;
85 return 1350000 / (val * div);
86}
87
88/* for temp */
89#define TEMP_TO_REG(val) (clamp_val(((val) < 0 ? (val) + 0x100 * 1000 \
90 : (val)) / 1000, 0, 0xff))
91
92static int temp_from_reg(int val)
93{
94 if (val & 0x80)
95 return (val - 0x100) * 1000;
96 return val * 1000;
97}
98
99/*
100 * The analog voltage inputs have 8mV LSB. Since the sysfs output is
101 * in mV as would be measured on the chip input pin, need to just
102 * multiply/divide by 8 to translate from/to register values.
103 */
104#define IN_TO_REG(val) (clamp_val((((val) + 4) / 8), 0, 255))
105#define IN_FROM_REG(val) ((val) * 8)
106
107#define DIV_FROM_REG(val) (1 << (val))
108
109static inline u8
110DIV_TO_REG(long val)
111{
112 int i;
113 val = clamp_val(val, 1, 128) >> 1;
114 for (i = 0; i < 7; i++) {
115 if (val == 0)
116 break;
117 val >>= 1;
118 }
119 return (u8)i;
120}
121
122struct w83l786ng_data {
123 struct i2c_client *client;
124 struct mutex update_lock;
125 bool valid; /* true if following fields are valid */
126 unsigned long last_updated; /* In jiffies */
127 unsigned long last_nonvolatile; /* In jiffies, last time we update the
128 * nonvolatile registers */
129
130 u8 in[3];
131 u8 in_max[3];
132 u8 in_min[3];
133 u8 fan[2];
134 u8 fan_div[2];
135 u8 fan_min[2];
136 u8 temp_type[2];
137 u8 temp[2][3];
138 u8 pwm[2];
139 u8 pwm_mode[2]; /* 0->DC variable voltage
140 * 1->PWM variable duty cycle */
141
142 u8 pwm_enable[2]; /* 1->manual
143 * 2->thermal cruise (also called SmartFan I) */
144 u8 tolerance[2];
145};
146
147static u8
148w83l786ng_read_value(struct i2c_client *client, u8 reg)
149{
150 return i2c_smbus_read_byte_data(client, reg);
151}
152
153static int
154w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value)
155{
156 return i2c_smbus_write_byte_data(client, reg, value);
157}
158
159static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
160{
161 struct w83l786ng_data *data = dev_get_drvdata(dev);
162 struct i2c_client *client = data->client;
163 int i, j;
164 u8 reg_tmp, pwmcfg;
165
166 mutex_lock(&data->update_lock);
167 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
168 || !data->valid) {
169 dev_dbg(&client->dev, "Updating w83l786ng data.\n");
170
171 /* Update the voltages measured value and limits */
172 for (i = 0; i < 3; i++) {
173 data->in[i] = w83l786ng_read_value(client,
174 W83L786NG_REG_IN(i));
175 data->in_min[i] = w83l786ng_read_value(client,
176 W83L786NG_REG_IN_MIN(i));
177 data->in_max[i] = w83l786ng_read_value(client,
178 W83L786NG_REG_IN_MAX(i));
179 }
180
181 /* Update the fan counts and limits */
182 for (i = 0; i < 2; i++) {
183 data->fan[i] = w83l786ng_read_value(client,
184 W83L786NG_REG_FAN(i));
185 data->fan_min[i] = w83l786ng_read_value(client,
186 W83L786NG_REG_FAN_MIN(i));
187 }
188
189 /* Update the fan divisor */
190 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
191 data->fan_div[0] = reg_tmp & 0x07;
192 data->fan_div[1] = (reg_tmp >> 4) & 0x07;
193
194 pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
195 for (i = 0; i < 2; i++) {
196 data->pwm_mode[i] =
197 ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
198 ? 0 : 1;
199 data->pwm_enable[i] =
200 ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1;
201 data->pwm[i] =
202 (w83l786ng_read_value(client, W83L786NG_REG_PWM[i])
203 & 0x0f) * 0x11;
204 }
205
206
207 /* Update the temperature sensors */
208 for (i = 0; i < 2; i++) {
209 for (j = 0; j < 3; j++) {
210 data->temp[i][j] = w83l786ng_read_value(client,
211 W83L786NG_REG_TEMP[i][j]);
212 }
213 }
214
215 /* Update Smart Fan I/II tolerance */
216 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE);
217 data->tolerance[0] = reg_tmp & 0x0f;
218 data->tolerance[1] = (reg_tmp >> 4) & 0x0f;
219
220 data->last_updated = jiffies;
221 data->valid = true;
222
223 }
224
225 mutex_unlock(&data->update_lock);
226
227 return data;
228}
229
230/* following are the sysfs callback functions */
231#define show_in_reg(reg) \
232static ssize_t \
233show_##reg(struct device *dev, struct device_attribute *attr, \
234 char *buf) \
235{ \
236 int nr = to_sensor_dev_attr(attr)->index; \
237 struct w83l786ng_data *data = w83l786ng_update_device(dev); \
238 return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
239}
240
241show_in_reg(in)
242show_in_reg(in_min)
243show_in_reg(in_max)
244
245#define store_in_reg(REG, reg) \
246static ssize_t \
247store_in_##reg(struct device *dev, struct device_attribute *attr, \
248 const char *buf, size_t count) \
249{ \
250 int nr = to_sensor_dev_attr(attr)->index; \
251 struct w83l786ng_data *data = dev_get_drvdata(dev); \
252 struct i2c_client *client = data->client; \
253 unsigned long val; \
254 int err = kstrtoul(buf, 10, &val); \
255 if (err) \
256 return err; \
257 mutex_lock(&data->update_lock); \
258 data->in_##reg[nr] = IN_TO_REG(val); \
259 w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \
260 data->in_##reg[nr]); \
261 mutex_unlock(&data->update_lock); \
262 return count; \
263}
264
265store_in_reg(MIN, min)
266store_in_reg(MAX, max)
267
268static struct sensor_device_attribute sda_in_input[] = {
269 SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
270 SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
271 SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
272};
273
274static struct sensor_device_attribute sda_in_min[] = {
275 SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
276 SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
277 SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
278};
279
280static struct sensor_device_attribute sda_in_max[] = {
281 SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
282 SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
283 SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
284};
285
286#define show_fan_reg(reg) \
287static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
288 char *buf) \
289{ \
290 int nr = to_sensor_dev_attr(attr)->index; \
291 struct w83l786ng_data *data = w83l786ng_update_device(dev); \
292 return sprintf(buf, "%d\n", \
293 fan_from_reg(data->reg[nr], DIV_FROM_REG(data->fan_div[nr]))); \
294}
295
296show_fan_reg(fan);
297show_fan_reg(fan_min);
298
299static ssize_t
300store_fan_min(struct device *dev, struct device_attribute *attr,
301 const char *buf, size_t count)
302{
303 int nr = to_sensor_dev_attr(attr)->index;
304 struct w83l786ng_data *data = dev_get_drvdata(dev);
305 struct i2c_client *client = data->client;
306 unsigned long val;
307 int err;
308
309 err = kstrtoul(buf, 10, &val);
310 if (err)
311 return err;
312
313 mutex_lock(&data->update_lock);
314 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
315 w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
316 data->fan_min[nr]);
317 mutex_unlock(&data->update_lock);
318
319 return count;
320}
321
322static ssize_t
323show_fan_div(struct device *dev, struct device_attribute *attr,
324 char *buf)
325{
326 int nr = to_sensor_dev_attr(attr)->index;
327 struct w83l786ng_data *data = w83l786ng_update_device(dev);
328 return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
329}
330
331/*
332 * Note: we save and restore the fan minimum here, because its value is
333 * determined in part by the fan divisor. This follows the principle of
334 * least surprise; the user doesn't expect the fan minimum to change just
335 * because the divisor changed.
336 */
337static ssize_t
338store_fan_div(struct device *dev, struct device_attribute *attr,
339 const char *buf, size_t count)
340{
341 int nr = to_sensor_dev_attr(attr)->index;
342 struct w83l786ng_data *data = dev_get_drvdata(dev);
343 struct i2c_client *client = data->client;
344
345 unsigned long min;
346 u8 tmp_fan_div;
347 u8 fan_div_reg;
348 u8 keep_mask = 0;
349 u8 new_shift = 0;
350
351 unsigned long val;
352 int err;
353
354 err = kstrtoul(buf, 10, &val);
355 if (err)
356 return err;
357
358 /* Save fan_min */
359 mutex_lock(&data->update_lock);
360 min = fan_from_reg(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
361
362 data->fan_div[nr] = DIV_TO_REG(val);
363
364 switch (nr) {
365 case 0:
366 keep_mask = 0xf8;
367 new_shift = 0;
368 break;
369 case 1:
370 keep_mask = 0x8f;
371 new_shift = 4;
372 break;
373 }
374
375 fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV)
376 & keep_mask;
377
378 tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;
379
380 w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV,
381 fan_div_reg | tmp_fan_div);
382
383 /* Restore fan_min */
384 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
385 w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
386 data->fan_min[nr]);
387 mutex_unlock(&data->update_lock);
388
389 return count;
390}
391
392static struct sensor_device_attribute sda_fan_input[] = {
393 SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
394 SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
395};
396
397static struct sensor_device_attribute sda_fan_min[] = {
398 SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
399 store_fan_min, 0),
400 SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
401 store_fan_min, 1),
402};
403
404static struct sensor_device_attribute sda_fan_div[] = {
405 SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div,
406 store_fan_div, 0),
407 SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div,
408 store_fan_div, 1),
409};
410
411
412/* read/write the temperature, includes measured value and limits */
413
414static ssize_t
415show_temp(struct device *dev, struct device_attribute *attr, char *buf)
416{
417 struct sensor_device_attribute_2 *sensor_attr =
418 to_sensor_dev_attr_2(attr);
419 int nr = sensor_attr->nr;
420 int index = sensor_attr->index;
421 struct w83l786ng_data *data = w83l786ng_update_device(dev);
422 return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr][index]));
423}
424
425static ssize_t
426store_temp(struct device *dev, struct device_attribute *attr,
427 const char *buf, size_t count)
428{
429 struct sensor_device_attribute_2 *sensor_attr =
430 to_sensor_dev_attr_2(attr);
431 int nr = sensor_attr->nr;
432 int index = sensor_attr->index;
433 struct w83l786ng_data *data = dev_get_drvdata(dev);
434 struct i2c_client *client = data->client;
435 long val;
436 int err;
437
438 err = kstrtol(buf, 10, &val);
439 if (err)
440 return err;
441
442 mutex_lock(&data->update_lock);
443 data->temp[nr][index] = TEMP_TO_REG(val);
444 w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index],
445 data->temp[nr][index]);
446 mutex_unlock(&data->update_lock);
447
448 return count;
449}
450
451static struct sensor_device_attribute_2 sda_temp_input[] = {
452 SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0),
453 SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0),
454};
455
456static struct sensor_device_attribute_2 sda_temp_max[] = {
457 SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
458 show_temp, store_temp, 0, 1),
459 SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
460 show_temp, store_temp, 1, 1),
461};
462
463static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
464 SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
465 show_temp, store_temp, 0, 2),
466 SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
467 show_temp, store_temp, 1, 2),
468};
469
470#define show_pwm_reg(reg) \
471static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
472 char *buf) \
473{ \
474 struct w83l786ng_data *data = w83l786ng_update_device(dev); \
475 int nr = to_sensor_dev_attr(attr)->index; \
476 return sprintf(buf, "%d\n", data->reg[nr]); \
477}
478
479show_pwm_reg(pwm_mode)
480show_pwm_reg(pwm_enable)
481show_pwm_reg(pwm)
482
483static ssize_t
484store_pwm_mode(struct device *dev, struct device_attribute *attr,
485 const char *buf, size_t count)
486{
487 int nr = to_sensor_dev_attr(attr)->index;
488 struct w83l786ng_data *data = dev_get_drvdata(dev);
489 struct i2c_client *client = data->client;
490 u8 reg;
491 unsigned long val;
492 int err;
493
494 err = kstrtoul(buf, 10, &val);
495 if (err)
496 return err;
497
498 if (val > 1)
499 return -EINVAL;
500 mutex_lock(&data->update_lock);
501 data->pwm_mode[nr] = val;
502 reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
503 reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]);
504 if (!val)
505 reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr];
506 w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
507 mutex_unlock(&data->update_lock);
508 return count;
509}
510
511static ssize_t
512store_pwm(struct device *dev, struct device_attribute *attr,
513 const char *buf, size_t count)
514{
515 int nr = to_sensor_dev_attr(attr)->index;
516 struct w83l786ng_data *data = dev_get_drvdata(dev);
517 struct i2c_client *client = data->client;
518 unsigned long val;
519 int err;
520
521 err = kstrtoul(buf, 10, &val);
522 if (err)
523 return err;
524 val = clamp_val(val, 0, 255);
525 val = DIV_ROUND_CLOSEST(val, 0x11);
526
527 mutex_lock(&data->update_lock);
528 data->pwm[nr] = val * 0x11;
529 val |= w83l786ng_read_value(client, W83L786NG_REG_PWM[nr]) & 0xf0;
530 w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
531 mutex_unlock(&data->update_lock);
532 return count;
533}
534
535static ssize_t
536store_pwm_enable(struct device *dev, struct device_attribute *attr,
537 const char *buf, size_t count)
538{
539 int nr = to_sensor_dev_attr(attr)->index;
540 struct w83l786ng_data *data = dev_get_drvdata(dev);
541 struct i2c_client *client = data->client;
542 u8 reg;
543 unsigned long val;
544 int err;
545
546 err = kstrtoul(buf, 10, &val);
547 if (err)
548 return err;
549
550 if (!val || val > 2) /* only modes 1 and 2 are supported */
551 return -EINVAL;
552
553 mutex_lock(&data->update_lock);
554 reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
555 data->pwm_enable[nr] = val;
556 reg &= ~(0x03 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
557 reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
558 w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
559 mutex_unlock(&data->update_lock);
560 return count;
561}
562
563static struct sensor_device_attribute sda_pwm[] = {
564 SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0),
565 SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1),
566};
567
568static struct sensor_device_attribute sda_pwm_mode[] = {
569 SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
570 store_pwm_mode, 0),
571 SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
572 store_pwm_mode, 1),
573};
574
575static struct sensor_device_attribute sda_pwm_enable[] = {
576 SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
577 store_pwm_enable, 0),
578 SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
579 store_pwm_enable, 1),
580};
581
582/* For Smart Fan I/Thermal Cruise and Smart Fan II */
583static ssize_t
584show_tolerance(struct device *dev, struct device_attribute *attr, char *buf)
585{
586 int nr = to_sensor_dev_attr(attr)->index;
587 struct w83l786ng_data *data = w83l786ng_update_device(dev);
588 return sprintf(buf, "%ld\n", (long)data->tolerance[nr]);
589}
590
591static ssize_t
592store_tolerance(struct device *dev, struct device_attribute *attr,
593 const char *buf, size_t count)
594{
595 int nr = to_sensor_dev_attr(attr)->index;
596 struct w83l786ng_data *data = dev_get_drvdata(dev);
597 struct i2c_client *client = data->client;
598 u8 tol_tmp, tol_mask;
599 unsigned long val;
600 int err;
601
602 err = kstrtoul(buf, 10, &val);
603 if (err)
604 return err;
605
606 mutex_lock(&data->update_lock);
607 tol_mask = w83l786ng_read_value(client,
608 W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0);
609 tol_tmp = clamp_val(val, 0, 15);
610 tol_tmp &= 0x0f;
611 data->tolerance[nr] = tol_tmp;
612 if (nr == 1)
613 tol_tmp <<= 4;
614
615 w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE,
616 tol_mask | tol_tmp);
617 mutex_unlock(&data->update_lock);
618 return count;
619}
620
621static struct sensor_device_attribute sda_tolerance[] = {
622 SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,
623 show_tolerance, store_tolerance, 0),
624 SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,
625 show_tolerance, store_tolerance, 1),
626};
627
628
629#define IN_UNIT_ATTRS(X) \
630 &sda_in_input[X].dev_attr.attr, \
631 &sda_in_min[X].dev_attr.attr, \
632 &sda_in_max[X].dev_attr.attr
633
634#define FAN_UNIT_ATTRS(X) \
635 &sda_fan_input[X].dev_attr.attr, \
636 &sda_fan_min[X].dev_attr.attr, \
637 &sda_fan_div[X].dev_attr.attr
638
639#define TEMP_UNIT_ATTRS(X) \
640 &sda_temp_input[X].dev_attr.attr, \
641 &sda_temp_max[X].dev_attr.attr, \
642 &sda_temp_max_hyst[X].dev_attr.attr
643
644#define PWM_UNIT_ATTRS(X) \
645 &sda_pwm[X].dev_attr.attr, \
646 &sda_pwm_mode[X].dev_attr.attr, \
647 &sda_pwm_enable[X].dev_attr.attr
648
649#define TOLERANCE_UNIT_ATTRS(X) \
650 &sda_tolerance[X].dev_attr.attr
651
652static struct attribute *w83l786ng_attrs[] = {
653 IN_UNIT_ATTRS(0),
654 IN_UNIT_ATTRS(1),
655 IN_UNIT_ATTRS(2),
656 FAN_UNIT_ATTRS(0),
657 FAN_UNIT_ATTRS(1),
658 TEMP_UNIT_ATTRS(0),
659 TEMP_UNIT_ATTRS(1),
660 PWM_UNIT_ATTRS(0),
661 PWM_UNIT_ATTRS(1),
662 TOLERANCE_UNIT_ATTRS(0),
663 TOLERANCE_UNIT_ATTRS(1),
664 NULL
665};
666
667ATTRIBUTE_GROUPS(w83l786ng);
668
669static int
670w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info)
671{
672 struct i2c_adapter *adapter = client->adapter;
673 u16 man_id;
674 u8 chip_id;
675
676 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
677 return -ENODEV;
678
679 /* Detection */
680 if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) {
681 dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n",
682 client->addr);
683 return -ENODEV;
684 }
685
686 /* Identification */
687 man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) +
688 w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2);
689 chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID);
690
691 if (man_id != 0x5CA3 || /* Winbond */
692 chip_id != 0x80) { /* W83L786NG */
693 dev_dbg(&adapter->dev,
694 "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
695 man_id, chip_id);
696 return -ENODEV;
697 }
698
699 strscpy(info->type, "w83l786ng", I2C_NAME_SIZE);
700
701 return 0;
702}
703
704static void w83l786ng_init_client(struct i2c_client *client)
705{
706 u8 tmp;
707
708 if (reset)
709 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80);
710
711 /* Start monitoring */
712 tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG);
713 if (!(tmp & 0x01))
714 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01);
715}
716
717static int
718w83l786ng_probe(struct i2c_client *client)
719{
720 struct device *dev = &client->dev;
721 struct w83l786ng_data *data;
722 struct device *hwmon_dev;
723 int i;
724 u8 reg_tmp;
725
726 data = devm_kzalloc(dev, sizeof(struct w83l786ng_data), GFP_KERNEL);
727 if (!data)
728 return -ENOMEM;
729
730 data->client = client;
731 mutex_init(&data->update_lock);
732
733 /* Initialize the chip */
734 w83l786ng_init_client(client);
735
736 /* A few vars need to be filled upon startup */
737 for (i = 0; i < 2; i++) {
738 data->fan_min[i] = w83l786ng_read_value(client,
739 W83L786NG_REG_FAN_MIN(i));
740 }
741
742 /* Update the fan divisor */
743 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
744 data->fan_div[0] = reg_tmp & 0x07;
745 data->fan_div[1] = (reg_tmp >> 4) & 0x07;
746
747 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
748 data,
749 w83l786ng_groups);
750 return PTR_ERR_OR_ZERO(hwmon_dev);
751}
752
753static const struct i2c_device_id w83l786ng_id[] = {
754 { "w83l786ng" },
755 { }
756};
757MODULE_DEVICE_TABLE(i2c, w83l786ng_id);
758
759static struct i2c_driver w83l786ng_driver = {
760 .class = I2C_CLASS_HWMON,
761 .driver = {
762 .name = "w83l786ng",
763 },
764 .probe = w83l786ng_probe,
765 .id_table = w83l786ng_id,
766 .detect = w83l786ng_detect,
767 .address_list = normal_i2c,
768};
769
770module_i2c_driver(w83l786ng_driver);
771
772MODULE_AUTHOR("Kevin Lo");
773MODULE_DESCRIPTION("w83l786ng driver");
774MODULE_LICENSE("GPL");