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d20620de HJK |
1 | /* |
2 | * max6650.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | * monitoring. | |
4 | * | |
2aa25c22 | 5 | * (C) 2007 by Hans J. Koch <hjk@hansjkoch.de> |
d20620de HJK |
6 | * |
7 | * based on code written by John Morris <john.morris@spirentcom.com> | |
8 | * Copyright (c) 2003 Spirent Communications | |
9 | * and Claus Gindhart <claus.gindhart@kontron.com> | |
10 | * | |
11 | * This module has only been tested with the MAX6650 chip. It should | |
12 | * also work with the MAX6651. It does not distinguish max6650 and max6651 | |
13 | * chips. | |
14 | * | |
52b5226f | 15 | * The datasheet was last seen at: |
d20620de HJK |
16 | * |
17 | * http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf | |
18 | * | |
19 | * This program is free software; you can redistribute it and/or modify | |
20 | * it under the terms of the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2 of the License, or | |
22 | * (at your option) any later version. | |
23 | * | |
24 | * This program is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with this program; if not, write to the Free Software | |
31 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
34 | #include <linux/module.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/jiffies.h> | |
38 | #include <linux/i2c.h> | |
39 | #include <linux/hwmon.h> | |
40 | #include <linux/hwmon-sysfs.h> | |
41 | #include <linux/err.h> | |
a6cdeefe | 42 | #include <linux/of_device.h> |
d20620de | 43 | |
d20620de HJK |
44 | /* |
45 | * Insmod parameters | |
46 | */ | |
47 | ||
48 | /* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */ | |
49 | static int fan_voltage; | |
50 | /* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */ | |
51 | static int prescaler; | |
a6cdeefe | 52 | /* clock: The clock frequency of the chip (max6651 can be clocked externally) */ |
d20620de HJK |
53 | static int clock = 254000; |
54 | ||
55 | module_param(fan_voltage, int, S_IRUGO); | |
56 | module_param(prescaler, int, S_IRUGO); | |
57 | module_param(clock, int, S_IRUGO); | |
58 | ||
d20620de HJK |
59 | /* |
60 | * MAX 6650/6651 registers | |
61 | */ | |
62 | ||
63 | #define MAX6650_REG_SPEED 0x00 | |
64 | #define MAX6650_REG_CONFIG 0x02 | |
65 | #define MAX6650_REG_GPIO_DEF 0x04 | |
66 | #define MAX6650_REG_DAC 0x06 | |
67 | #define MAX6650_REG_ALARM_EN 0x08 | |
68 | #define MAX6650_REG_ALARM 0x0A | |
69 | #define MAX6650_REG_TACH0 0x0C | |
70 | #define MAX6650_REG_TACH1 0x0E | |
71 | #define MAX6650_REG_TACH2 0x10 | |
72 | #define MAX6650_REG_TACH3 0x12 | |
73 | #define MAX6650_REG_GPIO_STAT 0x14 | |
74 | #define MAX6650_REG_COUNT 0x16 | |
75 | ||
76 | /* | |
77 | * Config register bits | |
78 | */ | |
79 | ||
80 | #define MAX6650_CFG_V12 0x08 | |
81 | #define MAX6650_CFG_PRESCALER_MASK 0x07 | |
82 | #define MAX6650_CFG_PRESCALER_2 0x01 | |
83 | #define MAX6650_CFG_PRESCALER_4 0x02 | |
84 | #define MAX6650_CFG_PRESCALER_8 0x03 | |
85 | #define MAX6650_CFG_PRESCALER_16 0x04 | |
86 | #define MAX6650_CFG_MODE_MASK 0x30 | |
87 | #define MAX6650_CFG_MODE_ON 0x00 | |
88 | #define MAX6650_CFG_MODE_OFF 0x10 | |
89 | #define MAX6650_CFG_MODE_CLOSED_LOOP 0x20 | |
90 | #define MAX6650_CFG_MODE_OPEN_LOOP 0x30 | |
91 | #define MAX6650_COUNT_MASK 0x03 | |
92 | ||
52b5226f CE |
93 | /* |
94 | * Alarm status register bits | |
95 | */ | |
96 | ||
97 | #define MAX6650_ALRM_MAX 0x01 | |
98 | #define MAX6650_ALRM_MIN 0x02 | |
99 | #define MAX6650_ALRM_TACH 0x04 | |
100 | #define MAX6650_ALRM_GPIO1 0x08 | |
101 | #define MAX6650_ALRM_GPIO2 0x10 | |
102 | ||
d20620de HJK |
103 | /* Minimum and maximum values of the FAN-RPM */ |
104 | #define FAN_RPM_MIN 240 | |
105 | #define FAN_RPM_MAX 30000 | |
106 | ||
107 | #define DIV_FROM_REG(reg) (1 << (reg & 7)) | |
108 | ||
d20620de HJK |
109 | /* |
110 | * Client data (each client gets its own) | |
111 | */ | |
112 | ||
bafda5d0 | 113 | struct max6650_data { |
17eaa25c GR |
114 | struct i2c_client *client; |
115 | const struct attribute_group *groups[3]; | |
d20620de | 116 | struct mutex update_lock; |
9c084dae | 117 | int nr_fans; |
d20620de HJK |
118 | char valid; /* zero until following fields are valid */ |
119 | unsigned long last_updated; /* in jiffies */ | |
120 | ||
121 | /* register values */ | |
122 | u8 speed; | |
123 | u8 config; | |
124 | u8 tach[4]; | |
125 | u8 count; | |
126 | u8 dac; | |
52b5226f | 127 | u8 alarm; |
d20620de HJK |
128 | }; |
129 | ||
1577f94b GR |
130 | static const u8 tach_reg[] = { |
131 | MAX6650_REG_TACH0, | |
132 | MAX6650_REG_TACH1, | |
133 | MAX6650_REG_TACH2, | |
134 | MAX6650_REG_TACH3, | |
135 | }; | |
136 | ||
a6cdeefe ML |
137 | static const struct of_device_id max6650_dt_match[] = { |
138 | { | |
139 | .compatible = "maxim,max6650", | |
140 | .data = (void *)1 | |
141 | }, | |
142 | { | |
143 | .compatible = "maxim,max6651", | |
144 | .data = (void *)4 | |
145 | }, | |
146 | { }, | |
147 | }; | |
148 | MODULE_DEVICE_TABLE(of, max6650_dt_match); | |
149 | ||
1577f94b GR |
150 | static struct max6650_data *max6650_update_device(struct device *dev) |
151 | { | |
17eaa25c GR |
152 | struct max6650_data *data = dev_get_drvdata(dev); |
153 | struct i2c_client *client = data->client; | |
1577f94b | 154 | int i; |
1577f94b GR |
155 | |
156 | mutex_lock(&data->update_lock); | |
157 | ||
158 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
159 | data->speed = i2c_smbus_read_byte_data(client, | |
160 | MAX6650_REG_SPEED); | |
161 | data->config = i2c_smbus_read_byte_data(client, | |
162 | MAX6650_REG_CONFIG); | |
163 | for (i = 0; i < data->nr_fans; i++) { | |
164 | data->tach[i] = i2c_smbus_read_byte_data(client, | |
165 | tach_reg[i]); | |
166 | } | |
167 | data->count = i2c_smbus_read_byte_data(client, | |
168 | MAX6650_REG_COUNT); | |
169 | data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC); | |
170 | ||
171 | /* | |
172 | * Alarms are cleared on read in case the condition that | |
173 | * caused the alarm is removed. Keep the value latched here | |
174 | * for providing the register through different alarm files. | |
175 | */ | |
176 | data->alarm |= i2c_smbus_read_byte_data(client, | |
177 | MAX6650_REG_ALARM); | |
178 | ||
179 | data->last_updated = jiffies; | |
180 | data->valid = 1; | |
181 | } | |
182 | ||
183 | mutex_unlock(&data->update_lock); | |
184 | ||
185 | return data; | |
186 | } | |
187 | ||
d20620de HJK |
188 | static ssize_t get_fan(struct device *dev, struct device_attribute *devattr, |
189 | char *buf) | |
190 | { | |
191 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
192 | struct max6650_data *data = max6650_update_device(dev); | |
193 | int rpm; | |
194 | ||
195 | /* | |
703af960 GR |
196 | * Calculation details: |
197 | * | |
198 | * Each tachometer counts over an interval given by the "count" | |
199 | * register (0.25, 0.5, 1 or 2 seconds). This module assumes | |
200 | * that the fans produce two pulses per revolution (this seems | |
201 | * to be the most common). | |
202 | */ | |
d20620de HJK |
203 | |
204 | rpm = ((data->tach[attr->index] * 120) / DIV_FROM_REG(data->count)); | |
205 | return sprintf(buf, "%d\n", rpm); | |
206 | } | |
207 | ||
208 | /* | |
209 | * Set the fan speed to the specified RPM (or read back the RPM setting). | |
210 | * This works in closed loop mode only. Use pwm1 for open loop speed setting. | |
211 | * | |
212 | * The MAX6650/1 will automatically control fan speed when in closed loop | |
213 | * mode. | |
214 | * | |
215 | * Assumptions: | |
216 | * | |
217 | * 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use | |
218 | * the clock module parameter if you need to fine tune this. | |
219 | * | |
220 | * 2) The prescaler (low three bits of the config register) has already | |
221 | * been set to an appropriate value. Use the prescaler module parameter | |
222 | * if your BIOS doesn't initialize the chip properly. | |
223 | * | |
224 | * The relevant equations are given on pages 21 and 22 of the datasheet. | |
225 | * | |
226 | * From the datasheet, the relevant equation when in regulation is: | |
227 | * | |
228 | * [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE | |
229 | * | |
230 | * where: | |
231 | * | |
232 | * fCLK is the oscillator frequency (either the 254kHz internal | |
233 | * oscillator or the externally applied clock) | |
234 | * | |
235 | * KTACH is the value in the speed register | |
236 | * | |
237 | * FanSpeed is the speed of the fan in rps | |
238 | * | |
239 | * KSCALE is the prescaler value (1, 2, 4, 8, or 16) | |
240 | * | |
241 | * When reading, we need to solve for FanSpeed. When writing, we need to | |
242 | * solve for KTACH. | |
243 | * | |
244 | * Note: this tachometer is completely separate from the tachometers | |
245 | * used to measure the fan speeds. Only one fan's speed (fan1) is | |
246 | * controlled. | |
247 | */ | |
248 | ||
249 | static ssize_t get_target(struct device *dev, struct device_attribute *devattr, | |
250 | char *buf) | |
251 | { | |
252 | struct max6650_data *data = max6650_update_device(dev); | |
253 | int kscale, ktach, rpm; | |
254 | ||
255 | /* | |
703af960 GR |
256 | * Use the datasheet equation: |
257 | * | |
258 | * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)] | |
259 | * | |
260 | * then multiply by 60 to give rpm. | |
261 | */ | |
d20620de HJK |
262 | |
263 | kscale = DIV_FROM_REG(data->config); | |
264 | ktach = data->speed; | |
265 | rpm = 60 * kscale * clock / (256 * (ktach + 1)); | |
266 | return sprintf(buf, "%d\n", rpm); | |
267 | } | |
268 | ||
269 | static ssize_t set_target(struct device *dev, struct device_attribute *devattr, | |
270 | const char *buf, size_t count) | |
271 | { | |
17eaa25c GR |
272 | struct max6650_data *data = dev_get_drvdata(dev); |
273 | struct i2c_client *client = data->client; | |
d20620de | 274 | int kscale, ktach; |
bafda5d0 GR |
275 | unsigned long rpm; |
276 | int err; | |
277 | ||
278 | err = kstrtoul(buf, 10, &rpm); | |
279 | if (err) | |
280 | return err; | |
d20620de | 281 | |
2a844c14 | 282 | rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX); |
d20620de HJK |
283 | |
284 | /* | |
703af960 GR |
285 | * Divide the required speed by 60 to get from rpm to rps, then |
286 | * use the datasheet equation: | |
287 | * | |
288 | * KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1 | |
289 | */ | |
d20620de HJK |
290 | |
291 | mutex_lock(&data->update_lock); | |
292 | ||
293 | kscale = DIV_FROM_REG(data->config); | |
294 | ktach = ((clock * kscale) / (256 * rpm / 60)) - 1; | |
295 | if (ktach < 0) | |
296 | ktach = 0; | |
297 | if (ktach > 255) | |
298 | ktach = 255; | |
299 | data->speed = ktach; | |
300 | ||
301 | i2c_smbus_write_byte_data(client, MAX6650_REG_SPEED, data->speed); | |
302 | ||
303 | mutex_unlock(&data->update_lock); | |
304 | ||
305 | return count; | |
306 | } | |
307 | ||
308 | /* | |
309 | * Get/set the fan speed in open loop mode using pwm1 sysfs file. | |
310 | * Speed is given as a relative value from 0 to 255, where 255 is maximum | |
311 | * speed. Note that this is done by writing directly to the chip's DAC, | |
312 | * it won't change the closed loop speed set by fan1_target. | |
313 | * Also note that due to rounding errors it is possible that you don't read | |
314 | * back exactly the value you have set. | |
315 | */ | |
316 | ||
317 | static ssize_t get_pwm(struct device *dev, struct device_attribute *devattr, | |
318 | char *buf) | |
319 | { | |
320 | int pwm; | |
321 | struct max6650_data *data = max6650_update_device(dev); | |
322 | ||
703af960 GR |
323 | /* |
324 | * Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans. | |
325 | * Lower DAC values mean higher speeds. | |
326 | */ | |
d20620de HJK |
327 | if (data->config & MAX6650_CFG_V12) |
328 | pwm = 255 - (255 * (int)data->dac)/180; | |
329 | else | |
330 | pwm = 255 - (255 * (int)data->dac)/76; | |
331 | ||
332 | if (pwm < 0) | |
333 | pwm = 0; | |
334 | ||
335 | return sprintf(buf, "%d\n", pwm); | |
336 | } | |
337 | ||
338 | static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr, | |
339 | const char *buf, size_t count) | |
340 | { | |
17eaa25c GR |
341 | struct max6650_data *data = dev_get_drvdata(dev); |
342 | struct i2c_client *client = data->client; | |
bafda5d0 GR |
343 | unsigned long pwm; |
344 | int err; | |
345 | ||
346 | err = kstrtoul(buf, 10, &pwm); | |
347 | if (err) | |
348 | return err; | |
d20620de | 349 | |
2a844c14 | 350 | pwm = clamp_val(pwm, 0, 255); |
d20620de HJK |
351 | |
352 | mutex_lock(&data->update_lock); | |
353 | ||
354 | if (data->config & MAX6650_CFG_V12) | |
355 | data->dac = 180 - (180 * pwm)/255; | |
356 | else | |
357 | data->dac = 76 - (76 * pwm)/255; | |
358 | ||
359 | i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac); | |
360 | ||
361 | mutex_unlock(&data->update_lock); | |
362 | ||
363 | return count; | |
364 | } | |
365 | ||
366 | /* | |
367 | * Get/Set controller mode: | |
368 | * Possible values: | |
369 | * 0 = Fan always on | |
370 | * 1 = Open loop, Voltage is set according to speed, not regulated. | |
371 | * 2 = Closed loop, RPM for all fans regulated by fan1 tachometer | |
372 | */ | |
373 | ||
374 | static ssize_t get_enable(struct device *dev, struct device_attribute *devattr, | |
375 | char *buf) | |
376 | { | |
377 | struct max6650_data *data = max6650_update_device(dev); | |
378 | int mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4; | |
379 | int sysfs_modes[4] = {0, 1, 2, 1}; | |
380 | ||
381 | return sprintf(buf, "%d\n", sysfs_modes[mode]); | |
382 | } | |
383 | ||
384 | static ssize_t set_enable(struct device *dev, struct device_attribute *devattr, | |
385 | const char *buf, size_t count) | |
386 | { | |
17eaa25c GR |
387 | struct max6650_data *data = dev_get_drvdata(dev); |
388 | struct i2c_client *client = data->client; | |
d20620de | 389 | int max6650_modes[3] = {0, 3, 2}; |
bafda5d0 GR |
390 | unsigned long mode; |
391 | int err; | |
392 | ||
393 | err = kstrtoul(buf, 10, &mode); | |
394 | if (err) | |
395 | return err; | |
d20620de | 396 | |
bafda5d0 | 397 | if (mode > 2) |
d20620de | 398 | return -EINVAL; |
d20620de HJK |
399 | |
400 | mutex_lock(&data->update_lock); | |
401 | ||
402 | data->config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); | |
403 | data->config = (data->config & ~MAX6650_CFG_MODE_MASK) | |
404 | | (max6650_modes[mode] << 4); | |
405 | ||
406 | i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, data->config); | |
407 | ||
408 | mutex_unlock(&data->update_lock); | |
409 | ||
410 | return count; | |
411 | } | |
412 | ||
413 | /* | |
414 | * Read/write functions for fan1_div sysfs file. The MAX6650 has no such | |
415 | * divider. We handle this by converting between divider and counttime: | |
416 | * | |
417 | * (counttime == k) <==> (divider == 2^k), k = 0, 1, 2, or 3 | |
418 | * | |
419 | * Lower values of k allow to connect a faster fan without the risk of | |
420 | * counter overflow. The price is lower resolution. You can also set counttime | |
421 | * using the module parameter. Note that the module parameter "prescaler" also | |
422 | * influences the behaviour. Unfortunately, there's no sysfs attribute | |
423 | * defined for that. See the data sheet for details. | |
424 | */ | |
425 | ||
426 | static ssize_t get_div(struct device *dev, struct device_attribute *devattr, | |
427 | char *buf) | |
428 | { | |
429 | struct max6650_data *data = max6650_update_device(dev); | |
430 | ||
431 | return sprintf(buf, "%d\n", DIV_FROM_REG(data->count)); | |
432 | } | |
433 | ||
434 | static ssize_t set_div(struct device *dev, struct device_attribute *devattr, | |
435 | const char *buf, size_t count) | |
436 | { | |
17eaa25c GR |
437 | struct max6650_data *data = dev_get_drvdata(dev); |
438 | struct i2c_client *client = data->client; | |
bafda5d0 GR |
439 | unsigned long div; |
440 | int err; | |
441 | ||
442 | err = kstrtoul(buf, 10, &div); | |
443 | if (err) | |
444 | return err; | |
d20620de HJK |
445 | |
446 | mutex_lock(&data->update_lock); | |
447 | switch (div) { | |
448 | case 1: | |
449 | data->count = 0; | |
450 | break; | |
451 | case 2: | |
452 | data->count = 1; | |
453 | break; | |
454 | case 4: | |
455 | data->count = 2; | |
456 | break; | |
457 | case 8: | |
458 | data->count = 3; | |
459 | break; | |
460 | default: | |
025dc740 | 461 | mutex_unlock(&data->update_lock); |
d20620de HJK |
462 | return -EINVAL; |
463 | } | |
464 | ||
465 | i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count); | |
466 | mutex_unlock(&data->update_lock); | |
467 | ||
468 | return count; | |
469 | } | |
470 | ||
52b5226f CE |
471 | /* |
472 | * Get alarm stati: | |
473 | * Possible values: | |
474 | * 0 = no alarm | |
475 | * 1 = alarm | |
476 | */ | |
477 | ||
478 | static ssize_t get_alarm(struct device *dev, struct device_attribute *devattr, | |
479 | char *buf) | |
480 | { | |
481 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
482 | struct max6650_data *data = max6650_update_device(dev); | |
17eaa25c | 483 | struct i2c_client *client = data->client; |
52b5226f CE |
484 | int alarm = 0; |
485 | ||
486 | if (data->alarm & attr->index) { | |
487 | mutex_lock(&data->update_lock); | |
488 | alarm = 1; | |
489 | data->alarm &= ~attr->index; | |
490 | data->alarm |= i2c_smbus_read_byte_data(client, | |
491 | MAX6650_REG_ALARM); | |
492 | mutex_unlock(&data->update_lock); | |
493 | } | |
494 | ||
495 | return sprintf(buf, "%d\n", alarm); | |
496 | } | |
497 | ||
d20620de HJK |
498 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0); |
499 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1); | |
500 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2); | |
501 | static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3); | |
502 | static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, get_target, set_target); | |
503 | static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_div, set_div); | |
504 | static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, get_enable, set_enable); | |
505 | static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm); | |
52b5226f CE |
506 | static SENSOR_DEVICE_ATTR(fan1_max_alarm, S_IRUGO, get_alarm, NULL, |
507 | MAX6650_ALRM_MAX); | |
508 | static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, get_alarm, NULL, | |
509 | MAX6650_ALRM_MIN); | |
510 | static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_alarm, NULL, | |
511 | MAX6650_ALRM_TACH); | |
512 | static SENSOR_DEVICE_ATTR(gpio1_alarm, S_IRUGO, get_alarm, NULL, | |
513 | MAX6650_ALRM_GPIO1); | |
514 | static SENSOR_DEVICE_ATTR(gpio2_alarm, S_IRUGO, get_alarm, NULL, | |
515 | MAX6650_ALRM_GPIO2); | |
516 | ||
587a1f16 | 517 | static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a, |
52b5226f CE |
518 | int n) |
519 | { | |
520 | struct device *dev = container_of(kobj, struct device, kobj); | |
17eaa25c GR |
521 | struct max6650_data *data = dev_get_drvdata(dev); |
522 | struct i2c_client *client = data->client; | |
52b5226f CE |
523 | u8 alarm_en = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN); |
524 | struct device_attribute *devattr; | |
d20620de | 525 | |
52b5226f CE |
526 | /* |
527 | * Hide the alarms that have not been enabled by the firmware | |
528 | */ | |
529 | ||
530 | devattr = container_of(a, struct device_attribute, attr); | |
531 | if (devattr == &sensor_dev_attr_fan1_max_alarm.dev_attr | |
532 | || devattr == &sensor_dev_attr_fan1_min_alarm.dev_attr | |
533 | || devattr == &sensor_dev_attr_fan1_fault.dev_attr | |
534 | || devattr == &sensor_dev_attr_gpio1_alarm.dev_attr | |
535 | || devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) { | |
536 | if (!(alarm_en & to_sensor_dev_attr(devattr)->index)) | |
537 | return 0; | |
538 | } | |
539 | ||
540 | return a->mode; | |
541 | } | |
d20620de HJK |
542 | |
543 | static struct attribute *max6650_attrs[] = { | |
544 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
d20620de HJK |
545 | &dev_attr_fan1_target.attr, |
546 | &dev_attr_fan1_div.attr, | |
547 | &dev_attr_pwm1_enable.attr, | |
548 | &dev_attr_pwm1.attr, | |
52b5226f CE |
549 | &sensor_dev_attr_fan1_max_alarm.dev_attr.attr, |
550 | &sensor_dev_attr_fan1_min_alarm.dev_attr.attr, | |
551 | &sensor_dev_attr_fan1_fault.dev_attr.attr, | |
552 | &sensor_dev_attr_gpio1_alarm.dev_attr.attr, | |
553 | &sensor_dev_attr_gpio2_alarm.dev_attr.attr, | |
d20620de HJK |
554 | NULL |
555 | }; | |
556 | ||
17eaa25c | 557 | static const struct attribute_group max6650_group = { |
d20620de | 558 | .attrs = max6650_attrs, |
52b5226f | 559 | .is_visible = max6650_attrs_visible, |
d20620de HJK |
560 | }; |
561 | ||
9c084dae JD |
562 | static struct attribute *max6651_attrs[] = { |
563 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
564 | &sensor_dev_attr_fan3_input.dev_attr.attr, | |
565 | &sensor_dev_attr_fan4_input.dev_attr.attr, | |
566 | NULL | |
567 | }; | |
568 | ||
17eaa25c | 569 | static const struct attribute_group max6651_group = { |
9c084dae JD |
570 | .attrs = max6651_attrs, |
571 | }; | |
572 | ||
d20620de HJK |
573 | /* |
574 | * Real code | |
575 | */ | |
576 | ||
17eaa25c GR |
577 | static int max6650_init_client(struct max6650_data *data, |
578 | struct i2c_client *client) | |
d20620de | 579 | { |
71ba0f31 | 580 | struct device *dev = &client->dev; |
d20620de HJK |
581 | int config; |
582 | int err = -EIO; | |
a6cdeefe ML |
583 | u32 voltage; |
584 | u32 prescale; | |
585 | ||
586 | if (of_property_read_u32(dev->of_node, "maxim,fan-microvolt", | |
587 | &voltage)) | |
588 | voltage = fan_voltage; | |
589 | else | |
590 | voltage /= 1000000; /* Microvolts to volts */ | |
591 | if (of_property_read_u32(dev->of_node, "maxim,fan-prescale", | |
592 | &prescale)) | |
593 | prescale = prescaler; | |
d20620de HJK |
594 | |
595 | config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); | |
596 | ||
597 | if (config < 0) { | |
71ba0f31 | 598 | dev_err(dev, "Error reading config, aborting.\n"); |
d20620de HJK |
599 | return err; |
600 | } | |
601 | ||
a6cdeefe | 602 | switch (voltage) { |
bafda5d0 GR |
603 | case 0: |
604 | break; | |
605 | case 5: | |
606 | config &= ~MAX6650_CFG_V12; | |
607 | break; | |
608 | case 12: | |
609 | config |= MAX6650_CFG_V12; | |
610 | break; | |
611 | default: | |
a6cdeefe | 612 | dev_err(dev, "illegal value for fan_voltage (%d)\n", voltage); |
d20620de HJK |
613 | } |
614 | ||
a6cdeefe | 615 | switch (prescale) { |
bafda5d0 GR |
616 | case 0: |
617 | break; | |
618 | case 1: | |
619 | config &= ~MAX6650_CFG_PRESCALER_MASK; | |
620 | break; | |
621 | case 2: | |
622 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
623 | | MAX6650_CFG_PRESCALER_2; | |
624 | break; | |
625 | case 4: | |
626 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
627 | | MAX6650_CFG_PRESCALER_4; | |
628 | break; | |
629 | case 8: | |
630 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
631 | | MAX6650_CFG_PRESCALER_8; | |
632 | break; | |
633 | case 16: | |
634 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
635 | | MAX6650_CFG_PRESCALER_16; | |
636 | break; | |
637 | default: | |
a6cdeefe | 638 | dev_err(dev, "illegal value for prescaler (%d)\n", prescale); |
d20620de HJK |
639 | } |
640 | ||
a6cdeefe ML |
641 | dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n", |
642 | (config & MAX6650_CFG_V12) ? 12 : 5, | |
d20620de HJK |
643 | 1 << (config & MAX6650_CFG_PRESCALER_MASK)); |
644 | ||
703af960 GR |
645 | /* |
646 | * If mode is set to "full off", we change it to "open loop" and | |
d20620de | 647 | * set DAC to 255, which has the same effect. We do this because |
84fb029f | 648 | * there's no "full off" mode defined in hwmon specifications. |
d20620de HJK |
649 | */ |
650 | ||
651 | if ((config & MAX6650_CFG_MODE_MASK) == MAX6650_CFG_MODE_OFF) { | |
71ba0f31 | 652 | dev_dbg(dev, "Change mode to open loop, full off.\n"); |
d20620de HJK |
653 | config = (config & ~MAX6650_CFG_MODE_MASK) |
654 | | MAX6650_CFG_MODE_OPEN_LOOP; | |
655 | if (i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, 255)) { | |
71ba0f31 | 656 | dev_err(dev, "DAC write error, aborting.\n"); |
d20620de HJK |
657 | return err; |
658 | } | |
659 | } | |
660 | ||
661 | if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) { | |
71ba0f31 | 662 | dev_err(dev, "Config write error, aborting.\n"); |
d20620de HJK |
663 | return err; |
664 | } | |
665 | ||
666 | data->config = config; | |
667 | data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT); | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
1577f94b GR |
672 | static int max6650_probe(struct i2c_client *client, |
673 | const struct i2c_device_id *id) | |
d20620de | 674 | { |
71ba0f31 | 675 | struct device *dev = &client->dev; |
a6cdeefe ML |
676 | const struct of_device_id *of_id = |
677 | of_match_device(of_match_ptr(max6650_dt_match), dev); | |
1577f94b | 678 | struct max6650_data *data; |
17eaa25c | 679 | struct device *hwmon_dev; |
1577f94b | 680 | int err; |
d20620de | 681 | |
71ba0f31 | 682 | data = devm_kzalloc(dev, sizeof(struct max6650_data), GFP_KERNEL); |
0b5e33b6 | 683 | if (!data) |
1577f94b | 684 | return -ENOMEM; |
d20620de | 685 | |
17eaa25c | 686 | data->client = client; |
1577f94b | 687 | mutex_init(&data->update_lock); |
a6cdeefe | 688 | data->nr_fans = of_id ? (int)(uintptr_t)of_id->data : id->driver_data; |
d20620de | 689 | |
1577f94b GR |
690 | /* |
691 | * Initialize the max6650 chip | |
692 | */ | |
17eaa25c | 693 | err = max6650_init_client(data, client); |
1577f94b GR |
694 | if (err) |
695 | return err; | |
52b5226f | 696 | |
17eaa25c | 697 | data->groups[0] = &max6650_group; |
1577f94b | 698 | /* 3 additional fan inputs for the MAX6651 */ |
1577f94b | 699 | if (data->nr_fans == 4) |
17eaa25c | 700 | data->groups[1] = &max6651_group; |
1577f94b | 701 | |
71ba0f31 | 702 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, |
17eaa25c GR |
703 | client->name, data, |
704 | data->groups); | |
705 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
1577f94b GR |
706 | } |
707 | ||
708 | static const struct i2c_device_id max6650_id[] = { | |
709 | { "max6650", 1 }, | |
710 | { "max6651", 4 }, | |
711 | { } | |
712 | }; | |
713 | MODULE_DEVICE_TABLE(i2c, max6650_id); | |
714 | ||
715 | static struct i2c_driver max6650_driver = { | |
716 | .driver = { | |
717 | .name = "max6650", | |
a6cdeefe | 718 | .of_match_table = of_match_ptr(max6650_dt_match), |
1577f94b GR |
719 | }, |
720 | .probe = max6650_probe, | |
1577f94b GR |
721 | .id_table = max6650_id, |
722 | }; | |
723 | ||
f0967eea | 724 | module_i2c_driver(max6650_driver); |
d20620de HJK |
725 | |
726 | MODULE_AUTHOR("Hans J. Koch"); | |
727 | MODULE_DESCRIPTION("MAX6650 sensor driver"); | |
728 | MODULE_LICENSE("GPL"); |