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