1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * max6639.c - Support for Maxim MAX6639 |
4 | * |
5 | * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller |
6 | * |
7 | * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de> |
8 | * |
9 | * based on the initial MAX6639 support from semptian.net |
10 | * by He Changqing <hechangqing@semptian.com> |
11 | */ |
12 | |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/jiffies.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/platform_data/max6639.h> |
23 | |
24 | /* Addresses to scan */ |
25 | static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END }; |
26 | |
27 | /* The MAX6639 registers, valid channel numbers: 0, 1 */ |
28 | #define MAX6639_REG_TEMP(ch) (0x00 + (ch)) |
29 | #define MAX6639_REG_STATUS 0x02 |
30 | #define MAX6639_REG_OUTPUT_MASK 0x03 |
31 | #define MAX6639_REG_GCONFIG 0x04 |
32 | #define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch)) |
33 | #define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch)) |
34 | #define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch)) |
35 | #define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch)) |
36 | #define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4) |
37 | #define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4) |
38 | #define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4) |
39 | #define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4) |
40 | #define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch)) |
41 | #define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch)) |
42 | #define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch)) |
43 | #define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch)) |
44 | #define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch)) |
45 | #define MAX6639_REG_DEVID 0x3D |
46 | #define MAX6639_REG_MANUID 0x3E |
47 | #define MAX6639_REG_DEVREV 0x3F |
48 | |
49 | /* Register bits */ |
50 | #define MAX6639_GCONFIG_STANDBY 0x80 |
51 | #define MAX6639_GCONFIG_POR 0x40 |
52 | #define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20 |
53 | #define MAX6639_GCONFIG_CH2_LOCAL 0x10 |
54 | #define MAX6639_GCONFIG_PWM_FREQ_HI 0x08 |
55 | |
56 | #define MAX6639_FAN_CONFIG1_PWM 0x80 |
57 | |
58 | #define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40 |
59 | |
60 | static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 }; |
61 | |
62 | #define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \ |
63 | 0 : (rpm_ranges[rpm_range] * 30) / (val)) |
64 | #define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255) |
65 | |
66 | /* |
67 | * Client data (each client gets its own) |
68 | */ |
69 | struct max6639_data { |
70 | struct i2c_client *client; |
71 | struct mutex update_lock; |
72 | bool valid; /* true if following fields are valid */ |
73 | unsigned long last_updated; /* In jiffies */ |
74 | |
75 | /* Register values sampled regularly */ |
76 | u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */ |
77 | bool temp_fault[2]; /* Detected temperature diode failure */ |
78 | u8 fan[2]; /* Register value: TACH count for fans >=30 */ |
79 | u8 status; /* Detected channel alarms and fan failures */ |
80 | |
81 | /* Register values only written to */ |
82 | u8 pwm[2]; /* Register value: Duty cycle 0..120 */ |
83 | u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */ |
84 | u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */ |
85 | u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */ |
86 | |
87 | /* Register values initialized only once */ |
88 | u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */ |
89 | u8 rpm_range; /* Index in above rpm_ranges table */ |
90 | |
91 | /* Optional regulator for FAN supply */ |
92 | struct regulator *reg; |
93 | }; |
94 | |
95 | static struct max6639_data *max6639_update_device(struct device *dev) |
96 | { |
97 | struct max6639_data *data = dev_get_drvdata(dev); |
98 | struct i2c_client *client = data->client; |
99 | struct max6639_data *ret = data; |
100 | int i; |
101 | int status_reg; |
102 | |
103 | mutex_lock(&data->update_lock); |
104 | |
105 | if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { |
106 | int res; |
107 | |
108 | dev_dbg(&client->dev, "Starting max6639 update\n" ); |
109 | |
110 | status_reg = i2c_smbus_read_byte_data(client, |
111 | MAX6639_REG_STATUS); |
112 | if (status_reg < 0) { |
113 | ret = ERR_PTR(error: status_reg); |
114 | goto abort; |
115 | } |
116 | |
117 | data->status = status_reg; |
118 | |
119 | for (i = 0; i < 2; i++) { |
120 | res = i2c_smbus_read_byte_data(client, |
121 | MAX6639_REG_FAN_CNT(i)); |
122 | if (res < 0) { |
123 | ret = ERR_PTR(error: res); |
124 | goto abort; |
125 | } |
126 | data->fan[i] = res; |
127 | |
128 | res = i2c_smbus_read_byte_data(client, |
129 | MAX6639_REG_TEMP_EXT(i)); |
130 | if (res < 0) { |
131 | ret = ERR_PTR(error: res); |
132 | goto abort; |
133 | } |
134 | data->temp[i] = res >> 5; |
135 | data->temp_fault[i] = res & 0x01; |
136 | |
137 | res = i2c_smbus_read_byte_data(client, |
138 | MAX6639_REG_TEMP(i)); |
139 | if (res < 0) { |
140 | ret = ERR_PTR(error: res); |
141 | goto abort; |
142 | } |
143 | data->temp[i] |= res << 3; |
144 | } |
145 | |
146 | data->last_updated = jiffies; |
147 | data->valid = true; |
148 | } |
149 | abort: |
150 | mutex_unlock(lock: &data->update_lock); |
151 | |
152 | return ret; |
153 | } |
154 | |
155 | static ssize_t temp_input_show(struct device *dev, |
156 | struct device_attribute *dev_attr, char *buf) |
157 | { |
158 | long temp; |
159 | struct max6639_data *data = max6639_update_device(dev); |
160 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
161 | |
162 | if (IS_ERR(ptr: data)) |
163 | return PTR_ERR(ptr: data); |
164 | |
165 | temp = data->temp[attr->index] * 125; |
166 | return sprintf(buf, fmt: "%ld\n" , temp); |
167 | } |
168 | |
169 | static ssize_t temp_fault_show(struct device *dev, |
170 | struct device_attribute *dev_attr, char *buf) |
171 | { |
172 | struct max6639_data *data = max6639_update_device(dev); |
173 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
174 | |
175 | if (IS_ERR(ptr: data)) |
176 | return PTR_ERR(ptr: data); |
177 | |
178 | return sprintf(buf, fmt: "%d\n" , data->temp_fault[attr->index]); |
179 | } |
180 | |
181 | static ssize_t temp_max_show(struct device *dev, |
182 | struct device_attribute *dev_attr, char *buf) |
183 | { |
184 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
185 | struct max6639_data *data = dev_get_drvdata(dev); |
186 | |
187 | return sprintf(buf, fmt: "%d\n" , (data->temp_therm[attr->index] * 1000)); |
188 | } |
189 | |
190 | static ssize_t temp_max_store(struct device *dev, |
191 | struct device_attribute *dev_attr, |
192 | const char *buf, size_t count) |
193 | { |
194 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
195 | struct max6639_data *data = dev_get_drvdata(dev); |
196 | struct i2c_client *client = data->client; |
197 | unsigned long val; |
198 | int res; |
199 | |
200 | res = kstrtoul(s: buf, base: 10, res: &val); |
201 | if (res) |
202 | return res; |
203 | |
204 | mutex_lock(&data->update_lock); |
205 | data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val); |
206 | i2c_smbus_write_byte_data(client, |
207 | MAX6639_REG_THERM_LIMIT(attr->index), |
208 | value: data->temp_therm[attr->index]); |
209 | mutex_unlock(lock: &data->update_lock); |
210 | return count; |
211 | } |
212 | |
213 | static ssize_t temp_crit_show(struct device *dev, |
214 | struct device_attribute *dev_attr, char *buf) |
215 | { |
216 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
217 | struct max6639_data *data = dev_get_drvdata(dev); |
218 | |
219 | return sprintf(buf, fmt: "%d\n" , (data->temp_alert[attr->index] * 1000)); |
220 | } |
221 | |
222 | static ssize_t temp_crit_store(struct device *dev, |
223 | struct device_attribute *dev_attr, |
224 | const char *buf, size_t count) |
225 | { |
226 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
227 | struct max6639_data *data = dev_get_drvdata(dev); |
228 | struct i2c_client *client = data->client; |
229 | unsigned long val; |
230 | int res; |
231 | |
232 | res = kstrtoul(s: buf, base: 10, res: &val); |
233 | if (res) |
234 | return res; |
235 | |
236 | mutex_lock(&data->update_lock); |
237 | data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val); |
238 | i2c_smbus_write_byte_data(client, |
239 | MAX6639_REG_ALERT_LIMIT(attr->index), |
240 | value: data->temp_alert[attr->index]); |
241 | mutex_unlock(lock: &data->update_lock); |
242 | return count; |
243 | } |
244 | |
245 | static ssize_t temp_emergency_show(struct device *dev, |
246 | struct device_attribute *dev_attr, |
247 | char *buf) |
248 | { |
249 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
250 | struct max6639_data *data = dev_get_drvdata(dev); |
251 | |
252 | return sprintf(buf, fmt: "%d\n" , (data->temp_ot[attr->index] * 1000)); |
253 | } |
254 | |
255 | static ssize_t temp_emergency_store(struct device *dev, |
256 | struct device_attribute *dev_attr, |
257 | const char *buf, size_t count) |
258 | { |
259 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
260 | struct max6639_data *data = dev_get_drvdata(dev); |
261 | struct i2c_client *client = data->client; |
262 | unsigned long val; |
263 | int res; |
264 | |
265 | res = kstrtoul(s: buf, base: 10, res: &val); |
266 | if (res) |
267 | return res; |
268 | |
269 | mutex_lock(&data->update_lock); |
270 | data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val); |
271 | i2c_smbus_write_byte_data(client, |
272 | MAX6639_REG_OT_LIMIT(attr->index), |
273 | value: data->temp_ot[attr->index]); |
274 | mutex_unlock(lock: &data->update_lock); |
275 | return count; |
276 | } |
277 | |
278 | static ssize_t pwm_show(struct device *dev, struct device_attribute *dev_attr, |
279 | char *buf) |
280 | { |
281 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
282 | struct max6639_data *data = dev_get_drvdata(dev); |
283 | |
284 | return sprintf(buf, fmt: "%d\n" , data->pwm[attr->index] * 255 / 120); |
285 | } |
286 | |
287 | static ssize_t pwm_store(struct device *dev, |
288 | struct device_attribute *dev_attr, const char *buf, |
289 | size_t count) |
290 | { |
291 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
292 | struct max6639_data *data = dev_get_drvdata(dev); |
293 | struct i2c_client *client = data->client; |
294 | unsigned long val; |
295 | int res; |
296 | |
297 | res = kstrtoul(s: buf, base: 10, res: &val); |
298 | if (res) |
299 | return res; |
300 | |
301 | val = clamp_val(val, 0, 255); |
302 | |
303 | mutex_lock(&data->update_lock); |
304 | data->pwm[attr->index] = (u8)(val * 120 / 255); |
305 | i2c_smbus_write_byte_data(client, |
306 | MAX6639_REG_TARGTDUTY(attr->index), |
307 | value: data->pwm[attr->index]); |
308 | mutex_unlock(lock: &data->update_lock); |
309 | return count; |
310 | } |
311 | |
312 | static ssize_t fan_input_show(struct device *dev, |
313 | struct device_attribute *dev_attr, char *buf) |
314 | { |
315 | struct max6639_data *data = max6639_update_device(dev); |
316 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
317 | |
318 | if (IS_ERR(ptr: data)) |
319 | return PTR_ERR(ptr: data); |
320 | |
321 | return sprintf(buf, fmt: "%d\n" , FAN_FROM_REG(data->fan[attr->index], |
322 | data->rpm_range)); |
323 | } |
324 | |
325 | static ssize_t alarm_show(struct device *dev, |
326 | struct device_attribute *dev_attr, char *buf) |
327 | { |
328 | struct max6639_data *data = max6639_update_device(dev); |
329 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
330 | |
331 | if (IS_ERR(ptr: data)) |
332 | return PTR_ERR(ptr: data); |
333 | |
334 | return sprintf(buf, fmt: "%d\n" , !!(data->status & (1 << attr->index))); |
335 | } |
336 | |
337 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0); |
338 | static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1); |
339 | static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0); |
340 | static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1); |
341 | static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0); |
342 | static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1); |
343 | static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0); |
344 | static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1); |
345 | static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0); |
346 | static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1); |
347 | static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0); |
348 | static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1); |
349 | static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0); |
350 | static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1); |
351 | static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1); |
352 | static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0); |
353 | static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3); |
354 | static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2); |
355 | static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7); |
356 | static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6); |
357 | static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5); |
358 | static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4); |
359 | |
360 | |
361 | static struct attribute *max6639_attrs[] = { |
362 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
363 | &sensor_dev_attr_temp2_input.dev_attr.attr, |
364 | &sensor_dev_attr_temp1_fault.dev_attr.attr, |
365 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
366 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
367 | &sensor_dev_attr_temp2_max.dev_attr.attr, |
368 | &sensor_dev_attr_temp1_crit.dev_attr.attr, |
369 | &sensor_dev_attr_temp2_crit.dev_attr.attr, |
370 | &sensor_dev_attr_temp1_emergency.dev_attr.attr, |
371 | &sensor_dev_attr_temp2_emergency.dev_attr.attr, |
372 | &sensor_dev_attr_pwm1.dev_attr.attr, |
373 | &sensor_dev_attr_pwm2.dev_attr.attr, |
374 | &sensor_dev_attr_fan1_input.dev_attr.attr, |
375 | &sensor_dev_attr_fan2_input.dev_attr.attr, |
376 | &sensor_dev_attr_fan1_fault.dev_attr.attr, |
377 | &sensor_dev_attr_fan2_fault.dev_attr.attr, |
378 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
379 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
380 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, |
381 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, |
382 | &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, |
383 | &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr, |
384 | NULL |
385 | }; |
386 | ATTRIBUTE_GROUPS(max6639); |
387 | |
388 | /* |
389 | * returns respective index in rpm_ranges table |
390 | * 1 by default on invalid range |
391 | */ |
392 | static int rpm_range_to_reg(int range) |
393 | { |
394 | int i; |
395 | |
396 | for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) { |
397 | if (rpm_ranges[i] == range) |
398 | return i; |
399 | } |
400 | |
401 | return 1; /* default: 4000 RPM */ |
402 | } |
403 | |
404 | static int max6639_init_client(struct i2c_client *client, |
405 | struct max6639_data *data) |
406 | { |
407 | struct max6639_platform_data *max6639_info = |
408 | dev_get_platdata(dev: &client->dev); |
409 | int i; |
410 | int rpm_range = 1; /* default: 4000 RPM */ |
411 | int err; |
412 | |
413 | /* Reset chip to default values, see below for GCONFIG setup */ |
414 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, |
415 | MAX6639_GCONFIG_POR); |
416 | if (err) |
417 | goto exit; |
418 | |
419 | /* Fans pulse per revolution is 2 by default */ |
420 | if (max6639_info && max6639_info->ppr > 0 && |
421 | max6639_info->ppr < 5) |
422 | data->ppr = max6639_info->ppr; |
423 | else |
424 | data->ppr = 2; |
425 | data->ppr -= 1; |
426 | |
427 | if (max6639_info) |
428 | rpm_range = rpm_range_to_reg(range: max6639_info->rpm_range); |
429 | data->rpm_range = rpm_range; |
430 | |
431 | for (i = 0; i < 2; i++) { |
432 | |
433 | /* Set Fan pulse per revolution */ |
434 | err = i2c_smbus_write_byte_data(client, |
435 | MAX6639_REG_FAN_PPR(i), |
436 | value: data->ppr << 6); |
437 | if (err) |
438 | goto exit; |
439 | |
440 | /* Fans config PWM, RPM */ |
441 | err = i2c_smbus_write_byte_data(client, |
442 | MAX6639_REG_FAN_CONFIG1(i), |
443 | MAX6639_FAN_CONFIG1_PWM | rpm_range); |
444 | if (err) |
445 | goto exit; |
446 | |
447 | /* Fans PWM polarity high by default */ |
448 | if (max6639_info && max6639_info->pwm_polarity == 0) |
449 | err = i2c_smbus_write_byte_data(client, |
450 | MAX6639_REG_FAN_CONFIG2a(i), value: 0x00); |
451 | else |
452 | err = i2c_smbus_write_byte_data(client, |
453 | MAX6639_REG_FAN_CONFIG2a(i), value: 0x02); |
454 | if (err) |
455 | goto exit; |
456 | |
457 | /* |
458 | * /THERM full speed enable, |
459 | * PWM frequency 25kHz, see also GCONFIG below |
460 | */ |
461 | err = i2c_smbus_write_byte_data(client, |
462 | MAX6639_REG_FAN_CONFIG3(i), |
463 | MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03); |
464 | if (err) |
465 | goto exit; |
466 | |
467 | /* Max. temp. 80C/90C/100C */ |
468 | data->temp_therm[i] = 80; |
469 | data->temp_alert[i] = 90; |
470 | data->temp_ot[i] = 100; |
471 | err = i2c_smbus_write_byte_data(client, |
472 | MAX6639_REG_THERM_LIMIT(i), |
473 | value: data->temp_therm[i]); |
474 | if (err) |
475 | goto exit; |
476 | err = i2c_smbus_write_byte_data(client, |
477 | MAX6639_REG_ALERT_LIMIT(i), |
478 | value: data->temp_alert[i]); |
479 | if (err) |
480 | goto exit; |
481 | err = i2c_smbus_write_byte_data(client, |
482 | MAX6639_REG_OT_LIMIT(i), value: data->temp_ot[i]); |
483 | if (err) |
484 | goto exit; |
485 | |
486 | /* PWM 120/120 (i.e. 100%) */ |
487 | data->pwm[i] = 120; |
488 | err = i2c_smbus_write_byte_data(client, |
489 | MAX6639_REG_TARGTDUTY(i), value: data->pwm[i]); |
490 | if (err) |
491 | goto exit; |
492 | } |
493 | /* Start monitoring */ |
494 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, |
495 | MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL | |
496 | MAX6639_GCONFIG_PWM_FREQ_HI); |
497 | exit: |
498 | return err; |
499 | } |
500 | |
501 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
502 | static int max6639_detect(struct i2c_client *client, |
503 | struct i2c_board_info *info) |
504 | { |
505 | struct i2c_adapter *adapter = client->adapter; |
506 | int dev_id, manu_id; |
507 | |
508 | if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
509 | return -ENODEV; |
510 | |
511 | /* Actual detection via device and manufacturer ID */ |
512 | dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID); |
513 | manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID); |
514 | if (dev_id != 0x58 || manu_id != 0x4D) |
515 | return -ENODEV; |
516 | |
517 | strscpy(info->type, "max6639" , I2C_NAME_SIZE); |
518 | |
519 | return 0; |
520 | } |
521 | |
522 | static void max6639_regulator_disable(void *data) |
523 | { |
524 | regulator_disable(regulator: data); |
525 | } |
526 | |
527 | static int max6639_probe(struct i2c_client *client) |
528 | { |
529 | struct device *dev = &client->dev; |
530 | struct max6639_data *data; |
531 | struct device *hwmon_dev; |
532 | int err; |
533 | |
534 | data = devm_kzalloc(dev, size: sizeof(struct max6639_data), GFP_KERNEL); |
535 | if (!data) |
536 | return -ENOMEM; |
537 | |
538 | data->client = client; |
539 | |
540 | data->reg = devm_regulator_get_optional(dev, id: "fan" ); |
541 | if (IS_ERR(ptr: data->reg)) { |
542 | if (PTR_ERR(ptr: data->reg) != -ENODEV) |
543 | return PTR_ERR(ptr: data->reg); |
544 | |
545 | data->reg = NULL; |
546 | } else { |
547 | /* Spin up fans */ |
548 | err = regulator_enable(regulator: data->reg); |
549 | if (err) { |
550 | dev_err(dev, "Failed to enable fan supply: %d\n" , err); |
551 | return err; |
552 | } |
553 | err = devm_add_action_or_reset(dev, max6639_regulator_disable, |
554 | data->reg); |
555 | if (err) { |
556 | dev_err(dev, "Failed to register action: %d\n" , err); |
557 | return err; |
558 | } |
559 | } |
560 | |
561 | mutex_init(&data->update_lock); |
562 | |
563 | /* Initialize the max6639 chip */ |
564 | err = max6639_init_client(client, data); |
565 | if (err < 0) |
566 | return err; |
567 | |
568 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, name: client->name, |
569 | drvdata: data, |
570 | groups: max6639_groups); |
571 | return PTR_ERR_OR_ZERO(ptr: hwmon_dev); |
572 | } |
573 | |
574 | static int max6639_suspend(struct device *dev) |
575 | { |
576 | struct i2c_client *client = to_i2c_client(dev); |
577 | struct max6639_data *data = dev_get_drvdata(dev); |
578 | int ret = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); |
579 | |
580 | if (ret < 0) |
581 | return ret; |
582 | |
583 | if (data->reg) |
584 | regulator_disable(regulator: data->reg); |
585 | |
586 | return i2c_smbus_write_byte_data(client, |
587 | MAX6639_REG_GCONFIG, value: ret | MAX6639_GCONFIG_STANDBY); |
588 | } |
589 | |
590 | static int max6639_resume(struct device *dev) |
591 | { |
592 | struct i2c_client *client = to_i2c_client(dev); |
593 | struct max6639_data *data = dev_get_drvdata(dev); |
594 | int ret; |
595 | |
596 | if (data->reg) { |
597 | ret = regulator_enable(regulator: data->reg); |
598 | if (ret) { |
599 | dev_err(dev, "Failed to enable fan supply: %d\n" , ret); |
600 | return ret; |
601 | } |
602 | } |
603 | |
604 | ret = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); |
605 | if (ret < 0) |
606 | return ret; |
607 | |
608 | return i2c_smbus_write_byte_data(client, |
609 | MAX6639_REG_GCONFIG, value: ret & ~MAX6639_GCONFIG_STANDBY); |
610 | } |
611 | |
612 | static const struct i2c_device_id max6639_id[] = { |
613 | {"max6639" , 0}, |
614 | { } |
615 | }; |
616 | |
617 | MODULE_DEVICE_TABLE(i2c, max6639_id); |
618 | |
619 | static DEFINE_SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume); |
620 | |
621 | static const struct of_device_id max6639_of_match[] = { |
622 | { .compatible = "maxim,max6639" , }, |
623 | { }, |
624 | }; |
625 | |
626 | static struct i2c_driver max6639_driver = { |
627 | .class = I2C_CLASS_HWMON, |
628 | .driver = { |
629 | .name = "max6639" , |
630 | .pm = pm_sleep_ptr(&max6639_pm_ops), |
631 | .of_match_table = max6639_of_match, |
632 | }, |
633 | .probe = max6639_probe, |
634 | .id_table = max6639_id, |
635 | .detect = max6639_detect, |
636 | .address_list = normal_i2c, |
637 | }; |
638 | |
639 | module_i2c_driver(max6639_driver); |
640 | |
641 | MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>" ); |
642 | MODULE_DESCRIPTION("max6639 driver" ); |
643 | MODULE_LICENSE("GPL" ); |
644 | |