Commit | Line | Data |
---|---|---|
74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d20620de HJK |
2 | /* |
3 | * max6650.c - Part of lm_sensors, Linux kernel modules for hardware | |
4 | * monitoring. | |
5 | * | |
2aa25c22 | 6 | * (C) 2007 by Hans J. Koch <hjk@hansjkoch.de> |
d20620de HJK |
7 | * |
8 | * based on code written by John Morris <john.morris@spirentcom.com> | |
9 | * Copyright (c) 2003 Spirent Communications | |
10 | * and Claus Gindhart <claus.gindhart@kontron.com> | |
11 | * | |
12 | * This module has only been tested with the MAX6650 chip. It should | |
13 | * also work with the MAX6651. It does not distinguish max6650 and max6651 | |
14 | * chips. | |
15 | * | |
52b5226f | 16 | * The datasheet was last seen at: |
d20620de HJK |
17 | * |
18 | * http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf | |
d20620de HJK |
19 | */ |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/jiffies.h> | |
25 | #include <linux/i2c.h> | |
26 | #include <linux/hwmon.h> | |
27 | #include <linux/hwmon-sysfs.h> | |
28 | #include <linux/err.h> | |
a6cdeefe | 29 | #include <linux/of_device.h> |
4f8d374b | 30 | #include <linux/thermal.h> |
d20620de | 31 | |
d20620de HJK |
32 | /* |
33 | * Insmod parameters | |
34 | */ | |
35 | ||
36 | /* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */ | |
37 | static int fan_voltage; | |
38 | /* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */ | |
39 | static int prescaler; | |
a6cdeefe | 40 | /* clock: The clock frequency of the chip (max6651 can be clocked externally) */ |
d20620de HJK |
41 | static int clock = 254000; |
42 | ||
0f50b2e8 GR |
43 | module_param(fan_voltage, int, 0444); |
44 | module_param(prescaler, int, 0444); | |
45 | module_param(clock, int, 0444); | |
d20620de | 46 | |
d20620de HJK |
47 | /* |
48 | * MAX 6650/6651 registers | |
49 | */ | |
50 | ||
51 | #define MAX6650_REG_SPEED 0x00 | |
52 | #define MAX6650_REG_CONFIG 0x02 | |
53 | #define MAX6650_REG_GPIO_DEF 0x04 | |
54 | #define MAX6650_REG_DAC 0x06 | |
55 | #define MAX6650_REG_ALARM_EN 0x08 | |
56 | #define MAX6650_REG_ALARM 0x0A | |
57 | #define MAX6650_REG_TACH0 0x0C | |
58 | #define MAX6650_REG_TACH1 0x0E | |
59 | #define MAX6650_REG_TACH2 0x10 | |
60 | #define MAX6650_REG_TACH3 0x12 | |
61 | #define MAX6650_REG_GPIO_STAT 0x14 | |
62 | #define MAX6650_REG_COUNT 0x16 | |
63 | ||
64 | /* | |
65 | * Config register bits | |
66 | */ | |
67 | ||
68 | #define MAX6650_CFG_V12 0x08 | |
69 | #define MAX6650_CFG_PRESCALER_MASK 0x07 | |
70 | #define MAX6650_CFG_PRESCALER_2 0x01 | |
71 | #define MAX6650_CFG_PRESCALER_4 0x02 | |
72 | #define MAX6650_CFG_PRESCALER_8 0x03 | |
73 | #define MAX6650_CFG_PRESCALER_16 0x04 | |
74 | #define MAX6650_CFG_MODE_MASK 0x30 | |
75 | #define MAX6650_CFG_MODE_ON 0x00 | |
76 | #define MAX6650_CFG_MODE_OFF 0x10 | |
77 | #define MAX6650_CFG_MODE_CLOSED_LOOP 0x20 | |
78 | #define MAX6650_CFG_MODE_OPEN_LOOP 0x30 | |
79 | #define MAX6650_COUNT_MASK 0x03 | |
80 | ||
52b5226f CE |
81 | /* |
82 | * Alarm status register bits | |
83 | */ | |
84 | ||
85 | #define MAX6650_ALRM_MAX 0x01 | |
86 | #define MAX6650_ALRM_MIN 0x02 | |
87 | #define MAX6650_ALRM_TACH 0x04 | |
88 | #define MAX6650_ALRM_GPIO1 0x08 | |
89 | #define MAX6650_ALRM_GPIO2 0x10 | |
90 | ||
d20620de HJK |
91 | /* Minimum and maximum values of the FAN-RPM */ |
92 | #define FAN_RPM_MIN 240 | |
93 | #define FAN_RPM_MAX 30000 | |
94 | ||
95 | #define DIV_FROM_REG(reg) (1 << (reg & 7)) | |
96 | ||
d20620de HJK |
97 | /* |
98 | * Client data (each client gets its own) | |
99 | */ | |
100 | ||
bafda5d0 | 101 | struct max6650_data { |
17eaa25c GR |
102 | struct i2c_client *client; |
103 | const struct attribute_group *groups[3]; | |
4f8d374b | 104 | struct thermal_cooling_device *cooling_dev; |
d20620de | 105 | struct mutex update_lock; |
9c084dae | 106 | int nr_fans; |
d20620de HJK |
107 | char valid; /* zero until following fields are valid */ |
108 | unsigned long last_updated; /* in jiffies */ | |
109 | ||
110 | /* register values */ | |
111 | u8 speed; | |
112 | u8 config; | |
113 | u8 tach[4]; | |
114 | u8 count; | |
115 | u8 dac; | |
52b5226f | 116 | u8 alarm; |
4f8d374b | 117 | unsigned long cooling_dev_state; |
d20620de HJK |
118 | }; |
119 | ||
1577f94b GR |
120 | static const u8 tach_reg[] = { |
121 | MAX6650_REG_TACH0, | |
122 | MAX6650_REG_TACH1, | |
123 | MAX6650_REG_TACH2, | |
124 | MAX6650_REG_TACH3, | |
125 | }; | |
126 | ||
2720ce7e | 127 | static const struct of_device_id __maybe_unused max6650_dt_match[] = { |
a6cdeefe ML |
128 | { |
129 | .compatible = "maxim,max6650", | |
130 | .data = (void *)1 | |
131 | }, | |
132 | { | |
133 | .compatible = "maxim,max6651", | |
134 | .data = (void *)4 | |
135 | }, | |
136 | { }, | |
137 | }; | |
138 | MODULE_DEVICE_TABLE(of, max6650_dt_match); | |
139 | ||
1577f94b GR |
140 | static struct max6650_data *max6650_update_device(struct device *dev) |
141 | { | |
17eaa25c GR |
142 | struct max6650_data *data = dev_get_drvdata(dev); |
143 | struct i2c_client *client = data->client; | |
1577f94b | 144 | int i; |
1577f94b GR |
145 | |
146 | mutex_lock(&data->update_lock); | |
147 | ||
148 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
149 | data->speed = i2c_smbus_read_byte_data(client, | |
150 | MAX6650_REG_SPEED); | |
151 | data->config = i2c_smbus_read_byte_data(client, | |
152 | MAX6650_REG_CONFIG); | |
153 | for (i = 0; i < data->nr_fans; i++) { | |
154 | data->tach[i] = i2c_smbus_read_byte_data(client, | |
155 | tach_reg[i]); | |
156 | } | |
157 | data->count = i2c_smbus_read_byte_data(client, | |
158 | MAX6650_REG_COUNT); | |
159 | data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC); | |
160 | ||
161 | /* | |
162 | * Alarms are cleared on read in case the condition that | |
163 | * caused the alarm is removed. Keep the value latched here | |
164 | * for providing the register through different alarm files. | |
165 | */ | |
166 | data->alarm |= i2c_smbus_read_byte_data(client, | |
167 | MAX6650_REG_ALARM); | |
168 | ||
169 | data->last_updated = jiffies; | |
170 | data->valid = 1; | |
171 | } | |
172 | ||
173 | mutex_unlock(&data->update_lock); | |
174 | ||
175 | return data; | |
176 | } | |
177 | ||
20005cc5 ML |
178 | /* |
179 | * Change the operating mode of the chip (if needed). | |
180 | * mode is one of the MAX6650_CFG_MODE_* values. | |
181 | */ | |
182 | static int max6650_set_operating_mode(struct max6650_data *data, u8 mode) | |
183 | { | |
184 | int result; | |
185 | u8 config = data->config; | |
186 | ||
187 | if (mode == (config & MAX6650_CFG_MODE_MASK)) | |
188 | return 0; | |
189 | ||
190 | config = (config & ~MAX6650_CFG_MODE_MASK) | mode; | |
191 | ||
192 | result = i2c_smbus_write_byte_data(data->client, MAX6650_REG_CONFIG, | |
193 | config); | |
194 | if (result < 0) | |
195 | return result; | |
196 | ||
197 | data->config = config; | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
44007117 GR |
202 | static ssize_t fan_show(struct device *dev, struct device_attribute *devattr, |
203 | char *buf) | |
d20620de HJK |
204 | { |
205 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
206 | struct max6650_data *data = max6650_update_device(dev); | |
207 | int rpm; | |
208 | ||
209 | /* | |
703af960 GR |
210 | * Calculation details: |
211 | * | |
212 | * Each tachometer counts over an interval given by the "count" | |
213 | * register (0.25, 0.5, 1 or 2 seconds). This module assumes | |
214 | * that the fans produce two pulses per revolution (this seems | |
215 | * to be the most common). | |
216 | */ | |
d20620de HJK |
217 | |
218 | rpm = ((data->tach[attr->index] * 120) / DIV_FROM_REG(data->count)); | |
219 | return sprintf(buf, "%d\n", rpm); | |
220 | } | |
221 | ||
222 | /* | |
223 | * Set the fan speed to the specified RPM (or read back the RPM setting). | |
224 | * This works in closed loop mode only. Use pwm1 for open loop speed setting. | |
225 | * | |
226 | * The MAX6650/1 will automatically control fan speed when in closed loop | |
227 | * mode. | |
228 | * | |
229 | * Assumptions: | |
230 | * | |
231 | * 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use | |
232 | * the clock module parameter if you need to fine tune this. | |
233 | * | |
234 | * 2) The prescaler (low three bits of the config register) has already | |
235 | * been set to an appropriate value. Use the prescaler module parameter | |
236 | * if your BIOS doesn't initialize the chip properly. | |
237 | * | |
238 | * The relevant equations are given on pages 21 and 22 of the datasheet. | |
239 | * | |
240 | * From the datasheet, the relevant equation when in regulation is: | |
241 | * | |
242 | * [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE | |
243 | * | |
244 | * where: | |
245 | * | |
246 | * fCLK is the oscillator frequency (either the 254kHz internal | |
247 | * oscillator or the externally applied clock) | |
248 | * | |
249 | * KTACH is the value in the speed register | |
250 | * | |
251 | * FanSpeed is the speed of the fan in rps | |
252 | * | |
253 | * KSCALE is the prescaler value (1, 2, 4, 8, or 16) | |
254 | * | |
255 | * When reading, we need to solve for FanSpeed. When writing, we need to | |
256 | * solve for KTACH. | |
257 | * | |
258 | * Note: this tachometer is completely separate from the tachometers | |
259 | * used to measure the fan speeds. Only one fan's speed (fan1) is | |
260 | * controlled. | |
261 | */ | |
262 | ||
1fc67376 JL |
263 | static ssize_t fan1_target_show(struct device *dev, |
264 | struct device_attribute *devattr, char *buf) | |
d20620de HJK |
265 | { |
266 | struct max6650_data *data = max6650_update_device(dev); | |
267 | int kscale, ktach, rpm; | |
268 | ||
269 | /* | |
703af960 GR |
270 | * Use the datasheet equation: |
271 | * | |
272 | * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)] | |
273 | * | |
274 | * then multiply by 60 to give rpm. | |
275 | */ | |
d20620de HJK |
276 | |
277 | kscale = DIV_FROM_REG(data->config); | |
278 | ktach = data->speed; | |
279 | rpm = 60 * kscale * clock / (256 * (ktach + 1)); | |
280 | return sprintf(buf, "%d\n", rpm); | |
281 | } | |
282 | ||
20005cc5 | 283 | static int max6650_set_target(struct max6650_data *data, unsigned long rpm) |
d20620de | 284 | { |
d20620de | 285 | int kscale, ktach; |
bafda5d0 | 286 | |
20005cc5 ML |
287 | if (rpm == 0) |
288 | return max6650_set_operating_mode(data, MAX6650_CFG_MODE_OFF); | |
d20620de | 289 | |
2a844c14 | 290 | rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX); |
d20620de HJK |
291 | |
292 | /* | |
703af960 GR |
293 | * Divide the required speed by 60 to get from rpm to rps, then |
294 | * use the datasheet equation: | |
295 | * | |
296 | * KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1 | |
297 | */ | |
d20620de | 298 | |
d20620de HJK |
299 | kscale = DIV_FROM_REG(data->config); |
300 | ktach = ((clock * kscale) / (256 * rpm / 60)) - 1; | |
301 | if (ktach < 0) | |
302 | ktach = 0; | |
303 | if (ktach > 255) | |
304 | ktach = 255; | |
305 | data->speed = ktach; | |
306 | ||
20005cc5 ML |
307 | return i2c_smbus_write_byte_data(data->client, MAX6650_REG_SPEED, |
308 | data->speed); | |
309 | } | |
310 | ||
1fc67376 JL |
311 | static ssize_t fan1_target_store(struct device *dev, |
312 | struct device_attribute *devattr, | |
313 | const char *buf, size_t count) | |
20005cc5 ML |
314 | { |
315 | struct max6650_data *data = dev_get_drvdata(dev); | |
316 | unsigned long rpm; | |
317 | int err; | |
318 | ||
319 | err = kstrtoul(buf, 10, &rpm); | |
320 | if (err) | |
321 | return err; | |
322 | ||
323 | mutex_lock(&data->update_lock); | |
324 | ||
325 | err = max6650_set_target(data, rpm); | |
d20620de HJK |
326 | |
327 | mutex_unlock(&data->update_lock); | |
328 | ||
20005cc5 ML |
329 | if (err < 0) |
330 | return err; | |
331 | ||
d20620de HJK |
332 | return count; |
333 | } | |
334 | ||
335 | /* | |
336 | * Get/set the fan speed in open loop mode using pwm1 sysfs file. | |
337 | * Speed is given as a relative value from 0 to 255, where 255 is maximum | |
338 | * speed. Note that this is done by writing directly to the chip's DAC, | |
339 | * it won't change the closed loop speed set by fan1_target. | |
340 | * Also note that due to rounding errors it is possible that you don't read | |
341 | * back exactly the value you have set. | |
342 | */ | |
343 | ||
1fc67376 JL |
344 | static ssize_t pwm1_show(struct device *dev, struct device_attribute *devattr, |
345 | char *buf) | |
d20620de HJK |
346 | { |
347 | int pwm; | |
348 | struct max6650_data *data = max6650_update_device(dev); | |
349 | ||
703af960 GR |
350 | /* |
351 | * Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans. | |
352 | * Lower DAC values mean higher speeds. | |
353 | */ | |
d20620de HJK |
354 | if (data->config & MAX6650_CFG_V12) |
355 | pwm = 255 - (255 * (int)data->dac)/180; | |
356 | else | |
357 | pwm = 255 - (255 * (int)data->dac)/76; | |
358 | ||
359 | if (pwm < 0) | |
360 | pwm = 0; | |
361 | ||
362 | return sprintf(buf, "%d\n", pwm); | |
363 | } | |
364 | ||
1fc67376 JL |
365 | static ssize_t pwm1_store(struct device *dev, |
366 | struct device_attribute *devattr, const char *buf, | |
367 | size_t count) | |
d20620de | 368 | { |
17eaa25c GR |
369 | struct max6650_data *data = dev_get_drvdata(dev); |
370 | struct i2c_client *client = data->client; | |
bafda5d0 GR |
371 | unsigned long pwm; |
372 | int err; | |
373 | ||
374 | err = kstrtoul(buf, 10, &pwm); | |
375 | if (err) | |
376 | return err; | |
d20620de | 377 | |
2a844c14 | 378 | pwm = clamp_val(pwm, 0, 255); |
d20620de HJK |
379 | |
380 | mutex_lock(&data->update_lock); | |
381 | ||
382 | if (data->config & MAX6650_CFG_V12) | |
383 | data->dac = 180 - (180 * pwm)/255; | |
384 | else | |
385 | data->dac = 76 - (76 * pwm)/255; | |
20005cc5 | 386 | err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac); |
d20620de HJK |
387 | |
388 | mutex_unlock(&data->update_lock); | |
389 | ||
20005cc5 | 390 | return err < 0 ? err : count; |
d20620de HJK |
391 | } |
392 | ||
393 | /* | |
394 | * Get/Set controller mode: | |
395 | * Possible values: | |
396 | * 0 = Fan always on | |
397 | * 1 = Open loop, Voltage is set according to speed, not regulated. | |
398 | * 2 = Closed loop, RPM for all fans regulated by fan1 tachometer | |
20005cc5 | 399 | * 3 = Fan off |
d20620de | 400 | */ |
1fc67376 JL |
401 | static ssize_t pwm1_enable_show(struct device *dev, |
402 | struct device_attribute *devattr, char *buf) | |
d20620de HJK |
403 | { |
404 | struct max6650_data *data = max6650_update_device(dev); | |
405 | int mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4; | |
20005cc5 | 406 | int sysfs_modes[4] = {0, 3, 2, 1}; |
d20620de HJK |
407 | |
408 | return sprintf(buf, "%d\n", sysfs_modes[mode]); | |
409 | } | |
410 | ||
1fc67376 JL |
411 | static ssize_t pwm1_enable_store(struct device *dev, |
412 | struct device_attribute *devattr, | |
413 | const char *buf, size_t count) | |
d20620de | 414 | { |
17eaa25c | 415 | struct max6650_data *data = dev_get_drvdata(dev); |
bafda5d0 GR |
416 | unsigned long mode; |
417 | int err; | |
20005cc5 ML |
418 | const u8 max6650_modes[] = { |
419 | MAX6650_CFG_MODE_ON, | |
420 | MAX6650_CFG_MODE_OPEN_LOOP, | |
421 | MAX6650_CFG_MODE_CLOSED_LOOP, | |
422 | MAX6650_CFG_MODE_OFF, | |
423 | }; | |
bafda5d0 GR |
424 | |
425 | err = kstrtoul(buf, 10, &mode); | |
426 | if (err) | |
427 | return err; | |
d20620de | 428 | |
20005cc5 | 429 | if (mode >= ARRAY_SIZE(max6650_modes)) |
d20620de | 430 | return -EINVAL; |
d20620de HJK |
431 | |
432 | mutex_lock(&data->update_lock); | |
433 | ||
20005cc5 | 434 | max6650_set_operating_mode(data, max6650_modes[mode]); |
d20620de HJK |
435 | |
436 | mutex_unlock(&data->update_lock); | |
437 | ||
438 | return count; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Read/write functions for fan1_div sysfs file. The MAX6650 has no such | |
443 | * divider. We handle this by converting between divider and counttime: | |
444 | * | |
445 | * (counttime == k) <==> (divider == 2^k), k = 0, 1, 2, or 3 | |
446 | * | |
447 | * Lower values of k allow to connect a faster fan without the risk of | |
448 | * counter overflow. The price is lower resolution. You can also set counttime | |
449 | * using the module parameter. Note that the module parameter "prescaler" also | |
450 | * influences the behaviour. Unfortunately, there's no sysfs attribute | |
451 | * defined for that. See the data sheet for details. | |
452 | */ | |
453 | ||
1fc67376 JL |
454 | static ssize_t fan1_div_show(struct device *dev, |
455 | struct device_attribute *devattr, char *buf) | |
d20620de HJK |
456 | { |
457 | struct max6650_data *data = max6650_update_device(dev); | |
458 | ||
459 | return sprintf(buf, "%d\n", DIV_FROM_REG(data->count)); | |
460 | } | |
461 | ||
1fc67376 JL |
462 | static ssize_t fan1_div_store(struct device *dev, |
463 | struct device_attribute *devattr, | |
464 | const char *buf, size_t count) | |
d20620de | 465 | { |
17eaa25c GR |
466 | struct max6650_data *data = dev_get_drvdata(dev); |
467 | struct i2c_client *client = data->client; | |
bafda5d0 GR |
468 | unsigned long div; |
469 | int err; | |
470 | ||
471 | err = kstrtoul(buf, 10, &div); | |
472 | if (err) | |
473 | return err; | |
d20620de HJK |
474 | |
475 | mutex_lock(&data->update_lock); | |
476 | switch (div) { | |
477 | case 1: | |
478 | data->count = 0; | |
479 | break; | |
480 | case 2: | |
481 | data->count = 1; | |
482 | break; | |
483 | case 4: | |
484 | data->count = 2; | |
485 | break; | |
486 | case 8: | |
487 | data->count = 3; | |
488 | break; | |
489 | default: | |
025dc740 | 490 | mutex_unlock(&data->update_lock); |
d20620de HJK |
491 | return -EINVAL; |
492 | } | |
493 | ||
494 | i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count); | |
495 | mutex_unlock(&data->update_lock); | |
496 | ||
497 | return count; | |
498 | } | |
499 | ||
52b5226f CE |
500 | /* |
501 | * Get alarm stati: | |
502 | * Possible values: | |
503 | * 0 = no alarm | |
504 | * 1 = alarm | |
505 | */ | |
506 | ||
44007117 GR |
507 | static ssize_t alarm_show(struct device *dev, |
508 | struct device_attribute *devattr, char *buf) | |
52b5226f CE |
509 | { |
510 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
511 | struct max6650_data *data = max6650_update_device(dev); | |
17eaa25c | 512 | struct i2c_client *client = data->client; |
52b5226f CE |
513 | int alarm = 0; |
514 | ||
515 | if (data->alarm & attr->index) { | |
516 | mutex_lock(&data->update_lock); | |
517 | alarm = 1; | |
518 | data->alarm &= ~attr->index; | |
519 | data->alarm |= i2c_smbus_read_byte_data(client, | |
520 | MAX6650_REG_ALARM); | |
521 | mutex_unlock(&data->update_lock); | |
522 | } | |
523 | ||
524 | return sprintf(buf, "%d\n", alarm); | |
525 | } | |
526 | ||
44007117 GR |
527 | static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0); |
528 | static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1); | |
529 | static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2); | |
530 | static SENSOR_DEVICE_ATTR_RO(fan4_input, fan, 3); | |
1fc67376 JL |
531 | static DEVICE_ATTR_RW(fan1_target); |
532 | static DEVICE_ATTR_RW(fan1_div); | |
533 | static DEVICE_ATTR_RW(pwm1_enable); | |
534 | static DEVICE_ATTR_RW(pwm1); | |
44007117 GR |
535 | static SENSOR_DEVICE_ATTR_RO(fan1_max_alarm, alarm, MAX6650_ALRM_MAX); |
536 | static SENSOR_DEVICE_ATTR_RO(fan1_min_alarm, alarm, MAX6650_ALRM_MIN); | |
537 | static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, MAX6650_ALRM_TACH); | |
538 | static SENSOR_DEVICE_ATTR_RO(gpio1_alarm, alarm, MAX6650_ALRM_GPIO1); | |
539 | static SENSOR_DEVICE_ATTR_RO(gpio2_alarm, alarm, MAX6650_ALRM_GPIO2); | |
52b5226f | 540 | |
587a1f16 | 541 | static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a, |
52b5226f CE |
542 | int n) |
543 | { | |
544 | struct device *dev = container_of(kobj, struct device, kobj); | |
17eaa25c GR |
545 | struct max6650_data *data = dev_get_drvdata(dev); |
546 | struct i2c_client *client = data->client; | |
52b5226f CE |
547 | u8 alarm_en = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN); |
548 | struct device_attribute *devattr; | |
d20620de | 549 | |
52b5226f CE |
550 | /* |
551 | * Hide the alarms that have not been enabled by the firmware | |
552 | */ | |
553 | ||
554 | devattr = container_of(a, struct device_attribute, attr); | |
555 | if (devattr == &sensor_dev_attr_fan1_max_alarm.dev_attr | |
556 | || devattr == &sensor_dev_attr_fan1_min_alarm.dev_attr | |
557 | || devattr == &sensor_dev_attr_fan1_fault.dev_attr | |
558 | || devattr == &sensor_dev_attr_gpio1_alarm.dev_attr | |
559 | || devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) { | |
560 | if (!(alarm_en & to_sensor_dev_attr(devattr)->index)) | |
561 | return 0; | |
562 | } | |
563 | ||
564 | return a->mode; | |
565 | } | |
d20620de HJK |
566 | |
567 | static struct attribute *max6650_attrs[] = { | |
568 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
d20620de HJK |
569 | &dev_attr_fan1_target.attr, |
570 | &dev_attr_fan1_div.attr, | |
571 | &dev_attr_pwm1_enable.attr, | |
572 | &dev_attr_pwm1.attr, | |
52b5226f CE |
573 | &sensor_dev_attr_fan1_max_alarm.dev_attr.attr, |
574 | &sensor_dev_attr_fan1_min_alarm.dev_attr.attr, | |
575 | &sensor_dev_attr_fan1_fault.dev_attr.attr, | |
576 | &sensor_dev_attr_gpio1_alarm.dev_attr.attr, | |
577 | &sensor_dev_attr_gpio2_alarm.dev_attr.attr, | |
d20620de HJK |
578 | NULL |
579 | }; | |
580 | ||
17eaa25c | 581 | static const struct attribute_group max6650_group = { |
d20620de | 582 | .attrs = max6650_attrs, |
52b5226f | 583 | .is_visible = max6650_attrs_visible, |
d20620de HJK |
584 | }; |
585 | ||
9c084dae JD |
586 | static struct attribute *max6651_attrs[] = { |
587 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
588 | &sensor_dev_attr_fan3_input.dev_attr.attr, | |
589 | &sensor_dev_attr_fan4_input.dev_attr.attr, | |
590 | NULL | |
591 | }; | |
592 | ||
17eaa25c | 593 | static const struct attribute_group max6651_group = { |
9c084dae JD |
594 | .attrs = max6651_attrs, |
595 | }; | |
596 | ||
d20620de HJK |
597 | /* |
598 | * Real code | |
599 | */ | |
600 | ||
17eaa25c GR |
601 | static int max6650_init_client(struct max6650_data *data, |
602 | struct i2c_client *client) | |
d20620de | 603 | { |
71ba0f31 | 604 | struct device *dev = &client->dev; |
d20620de HJK |
605 | int config; |
606 | int err = -EIO; | |
a6cdeefe ML |
607 | u32 voltage; |
608 | u32 prescale; | |
20005cc5 | 609 | u32 target_rpm; |
a6cdeefe ML |
610 | |
611 | if (of_property_read_u32(dev->of_node, "maxim,fan-microvolt", | |
612 | &voltage)) | |
613 | voltage = fan_voltage; | |
614 | else | |
615 | voltage /= 1000000; /* Microvolts to volts */ | |
616 | if (of_property_read_u32(dev->of_node, "maxim,fan-prescale", | |
617 | &prescale)) | |
618 | prescale = prescaler; | |
d20620de HJK |
619 | |
620 | config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); | |
621 | ||
622 | if (config < 0) { | |
71ba0f31 | 623 | dev_err(dev, "Error reading config, aborting.\n"); |
d20620de HJK |
624 | return err; |
625 | } | |
626 | ||
a6cdeefe | 627 | switch (voltage) { |
bafda5d0 GR |
628 | case 0: |
629 | break; | |
630 | case 5: | |
631 | config &= ~MAX6650_CFG_V12; | |
632 | break; | |
633 | case 12: | |
634 | config |= MAX6650_CFG_V12; | |
635 | break; | |
636 | default: | |
a6cdeefe | 637 | dev_err(dev, "illegal value for fan_voltage (%d)\n", voltage); |
d20620de HJK |
638 | } |
639 | ||
a6cdeefe | 640 | switch (prescale) { |
bafda5d0 GR |
641 | case 0: |
642 | break; | |
643 | case 1: | |
644 | config &= ~MAX6650_CFG_PRESCALER_MASK; | |
645 | break; | |
646 | case 2: | |
647 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
648 | | MAX6650_CFG_PRESCALER_2; | |
649 | break; | |
650 | case 4: | |
651 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
652 | | MAX6650_CFG_PRESCALER_4; | |
653 | break; | |
654 | case 8: | |
655 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
656 | | MAX6650_CFG_PRESCALER_8; | |
657 | break; | |
658 | case 16: | |
659 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
660 | | MAX6650_CFG_PRESCALER_16; | |
661 | break; | |
662 | default: | |
a6cdeefe | 663 | dev_err(dev, "illegal value for prescaler (%d)\n", prescale); |
d20620de HJK |
664 | } |
665 | ||
a6cdeefe ML |
666 | dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n", |
667 | (config & MAX6650_CFG_V12) ? 12 : 5, | |
d20620de HJK |
668 | 1 << (config & MAX6650_CFG_PRESCALER_MASK)); |
669 | ||
d20620de | 670 | if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) { |
71ba0f31 | 671 | dev_err(dev, "Config write error, aborting.\n"); |
d20620de HJK |
672 | return err; |
673 | } | |
674 | ||
675 | data->config = config; | |
676 | data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT); | |
677 | ||
20005cc5 ML |
678 | if (!of_property_read_u32(client->dev.of_node, "maxim,fan-target-rpm", |
679 | &target_rpm)) { | |
680 | max6650_set_target(data, target_rpm); | |
681 | max6650_set_operating_mode(data, MAX6650_CFG_MODE_CLOSED_LOOP); | |
682 | } | |
683 | ||
d20620de HJK |
684 | return 0; |
685 | } | |
686 | ||
4f8d374b JFD |
687 | #if IS_ENABLED(CONFIG_THERMAL) |
688 | ||
689 | static int max6650_get_max_state(struct thermal_cooling_device *cdev, | |
690 | unsigned long *state) | |
691 | { | |
692 | *state = 255; | |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
697 | static int max6650_get_cur_state(struct thermal_cooling_device *cdev, | |
698 | unsigned long *state) | |
699 | { | |
700 | struct max6650_data *data = cdev->devdata; | |
701 | ||
702 | *state = data->cooling_dev_state; | |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
707 | static int max6650_set_cur_state(struct thermal_cooling_device *cdev, | |
708 | unsigned long state) | |
709 | { | |
710 | struct max6650_data *data = cdev->devdata; | |
711 | struct i2c_client *client = data->client; | |
712 | int err; | |
713 | ||
714 | state = clamp_val(state, 0, 255); | |
715 | ||
716 | mutex_lock(&data->update_lock); | |
717 | ||
718 | if (data->config & MAX6650_CFG_V12) | |
719 | data->dac = 180 - (180 * state)/255; | |
720 | else | |
721 | data->dac = 76 - (76 * state)/255; | |
722 | ||
723 | err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac); | |
724 | ||
725 | if (!err) { | |
726 | max6650_set_operating_mode(data, state ? | |
727 | MAX6650_CFG_MODE_OPEN_LOOP : | |
728 | MAX6650_CFG_MODE_OFF); | |
729 | data->cooling_dev_state = state; | |
730 | } | |
731 | ||
732 | mutex_unlock(&data->update_lock); | |
733 | ||
734 | return err < 0 ? err : 0; | |
735 | } | |
736 | ||
737 | static const struct thermal_cooling_device_ops max6650_cooling_ops = { | |
738 | .get_max_state = max6650_get_max_state, | |
739 | .get_cur_state = max6650_get_cur_state, | |
740 | .set_cur_state = max6650_set_cur_state, | |
741 | }; | |
742 | #endif | |
743 | ||
1577f94b GR |
744 | static int max6650_probe(struct i2c_client *client, |
745 | const struct i2c_device_id *id) | |
d20620de | 746 | { |
71ba0f31 | 747 | struct device *dev = &client->dev; |
a6cdeefe ML |
748 | const struct of_device_id *of_id = |
749 | of_match_device(of_match_ptr(max6650_dt_match), dev); | |
1577f94b | 750 | struct max6650_data *data; |
17eaa25c | 751 | struct device *hwmon_dev; |
1577f94b | 752 | int err; |
d20620de | 753 | |
71ba0f31 | 754 | data = devm_kzalloc(dev, sizeof(struct max6650_data), GFP_KERNEL); |
0b5e33b6 | 755 | if (!data) |
1577f94b | 756 | return -ENOMEM; |
d20620de | 757 | |
17eaa25c | 758 | data->client = client; |
4f8d374b | 759 | i2c_set_clientdata(client, data); |
1577f94b | 760 | mutex_init(&data->update_lock); |
a6cdeefe | 761 | data->nr_fans = of_id ? (int)(uintptr_t)of_id->data : id->driver_data; |
d20620de | 762 | |
1577f94b GR |
763 | /* |
764 | * Initialize the max6650 chip | |
765 | */ | |
17eaa25c | 766 | err = max6650_init_client(data, client); |
1577f94b GR |
767 | if (err) |
768 | return err; | |
52b5226f | 769 | |
17eaa25c | 770 | data->groups[0] = &max6650_group; |
1577f94b | 771 | /* 3 additional fan inputs for the MAX6651 */ |
1577f94b | 772 | if (data->nr_fans == 4) |
17eaa25c | 773 | data->groups[1] = &max6651_group; |
1577f94b | 774 | |
71ba0f31 | 775 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, |
17eaa25c GR |
776 | client->name, data, |
777 | data->groups); | |
4f8d374b JFD |
778 | err = PTR_ERR_OR_ZERO(hwmon_dev); |
779 | if (err) | |
780 | return err; | |
781 | ||
782 | #if IS_ENABLED(CONFIG_THERMAL) | |
783 | data->cooling_dev = | |
784 | thermal_of_cooling_device_register(client->dev.of_node, | |
785 | client->name, data, | |
786 | &max6650_cooling_ops); | |
787 | if (IS_ERR(data->cooling_dev)) | |
788 | dev_warn(&client->dev, | |
789 | "thermal cooling device register failed: %ld\n", | |
790 | PTR_ERR(data->cooling_dev)); | |
4f8d374b JFD |
791 | #endif |
792 | return 0; | |
793 | } | |
794 | ||
795 | static int max6650_remove(struct i2c_client *client) | |
796 | { | |
797 | struct max6650_data *data = i2c_get_clientdata(client); | |
798 | ||
799 | if (!IS_ERR(data->cooling_dev)) | |
800 | thermal_cooling_device_unregister(data->cooling_dev); | |
801 | ||
802 | return 0; | |
1577f94b GR |
803 | } |
804 | ||
805 | static const struct i2c_device_id max6650_id[] = { | |
806 | { "max6650", 1 }, | |
807 | { "max6651", 4 }, | |
808 | { } | |
809 | }; | |
810 | MODULE_DEVICE_TABLE(i2c, max6650_id); | |
811 | ||
812 | static struct i2c_driver max6650_driver = { | |
813 | .driver = { | |
814 | .name = "max6650", | |
a6cdeefe | 815 | .of_match_table = of_match_ptr(max6650_dt_match), |
1577f94b GR |
816 | }, |
817 | .probe = max6650_probe, | |
4f8d374b | 818 | .remove = max6650_remove, |
1577f94b GR |
819 | .id_table = max6650_id, |
820 | }; | |
821 | ||
f0967eea | 822 | module_i2c_driver(max6650_driver); |
d20620de HJK |
823 | |
824 | MODULE_AUTHOR("Hans J. Koch"); | |
825 | MODULE_DESCRIPTION("MAX6650 sensor driver"); | |
826 | MODULE_LICENSE("GPL"); |