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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 | ||
0d57abd5 JD |
108 | static int max6650_probe(struct i2c_client *client, |
109 | const struct i2c_device_id *id); | |
d20620de | 110 | static int max6650_init_client(struct i2c_client *client); |
0d57abd5 | 111 | static int max6650_remove(struct i2c_client *client); |
d20620de HJK |
112 | static struct max6650_data *max6650_update_device(struct device *dev); |
113 | ||
114 | /* | |
115 | * Driver data (common to all clients) | |
116 | */ | |
117 | ||
0d57abd5 | 118 | static const struct i2c_device_id max6650_id[] = { |
9c084dae JD |
119 | { "max6650", 1 }, |
120 | { "max6651", 4 }, | |
0d57abd5 JD |
121 | { } |
122 | }; | |
123 | MODULE_DEVICE_TABLE(i2c, max6650_id); | |
124 | ||
d20620de HJK |
125 | static struct i2c_driver max6650_driver = { |
126 | .driver = { | |
127 | .name = "max6650", | |
128 | }, | |
0d57abd5 JD |
129 | .probe = max6650_probe, |
130 | .remove = max6650_remove, | |
131 | .id_table = max6650_id, | |
d20620de HJK |
132 | }; |
133 | ||
134 | /* | |
135 | * Client data (each client gets its own) | |
136 | */ | |
137 | ||
138 | struct max6650_data | |
139 | { | |
1beeffe4 | 140 | struct device *hwmon_dev; |
d20620de | 141 | struct mutex update_lock; |
9c084dae | 142 | int nr_fans; |
d20620de HJK |
143 | char valid; /* zero until following fields are valid */ |
144 | unsigned long last_updated; /* in jiffies */ | |
145 | ||
146 | /* register values */ | |
147 | u8 speed; | |
148 | u8 config; | |
149 | u8 tach[4]; | |
150 | u8 count; | |
151 | u8 dac; | |
52b5226f | 152 | u8 alarm; |
d20620de HJK |
153 | }; |
154 | ||
155 | static ssize_t get_fan(struct device *dev, struct device_attribute *devattr, | |
156 | char *buf) | |
157 | { | |
158 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
159 | struct max6650_data *data = max6650_update_device(dev); | |
160 | int rpm; | |
161 | ||
162 | /* | |
163 | * Calculation details: | |
164 | * | |
165 | * Each tachometer counts over an interval given by the "count" | |
166 | * register (0.25, 0.5, 1 or 2 seconds). This module assumes | |
167 | * that the fans produce two pulses per revolution (this seems | |
168 | * to be the most common). | |
169 | */ | |
170 | ||
171 | rpm = ((data->tach[attr->index] * 120) / DIV_FROM_REG(data->count)); | |
172 | return sprintf(buf, "%d\n", rpm); | |
173 | } | |
174 | ||
175 | /* | |
176 | * Set the fan speed to the specified RPM (or read back the RPM setting). | |
177 | * This works in closed loop mode only. Use pwm1 for open loop speed setting. | |
178 | * | |
179 | * The MAX6650/1 will automatically control fan speed when in closed loop | |
180 | * mode. | |
181 | * | |
182 | * Assumptions: | |
183 | * | |
184 | * 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use | |
185 | * the clock module parameter if you need to fine tune this. | |
186 | * | |
187 | * 2) The prescaler (low three bits of the config register) has already | |
188 | * been set to an appropriate value. Use the prescaler module parameter | |
189 | * if your BIOS doesn't initialize the chip properly. | |
190 | * | |
191 | * The relevant equations are given on pages 21 and 22 of the datasheet. | |
192 | * | |
193 | * From the datasheet, the relevant equation when in regulation is: | |
194 | * | |
195 | * [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE | |
196 | * | |
197 | * where: | |
198 | * | |
199 | * fCLK is the oscillator frequency (either the 254kHz internal | |
200 | * oscillator or the externally applied clock) | |
201 | * | |
202 | * KTACH is the value in the speed register | |
203 | * | |
204 | * FanSpeed is the speed of the fan in rps | |
205 | * | |
206 | * KSCALE is the prescaler value (1, 2, 4, 8, or 16) | |
207 | * | |
208 | * When reading, we need to solve for FanSpeed. When writing, we need to | |
209 | * solve for KTACH. | |
210 | * | |
211 | * Note: this tachometer is completely separate from the tachometers | |
212 | * used to measure the fan speeds. Only one fan's speed (fan1) is | |
213 | * controlled. | |
214 | */ | |
215 | ||
216 | static ssize_t get_target(struct device *dev, struct device_attribute *devattr, | |
217 | char *buf) | |
218 | { | |
219 | struct max6650_data *data = max6650_update_device(dev); | |
220 | int kscale, ktach, rpm; | |
221 | ||
222 | /* | |
223 | * Use the datasheet equation: | |
224 | * | |
225 | * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)] | |
226 | * | |
227 | * then multiply by 60 to give rpm. | |
228 | */ | |
229 | ||
230 | kscale = DIV_FROM_REG(data->config); | |
231 | ktach = data->speed; | |
232 | rpm = 60 * kscale * clock / (256 * (ktach + 1)); | |
233 | return sprintf(buf, "%d\n", rpm); | |
234 | } | |
235 | ||
236 | static ssize_t set_target(struct device *dev, struct device_attribute *devattr, | |
237 | const char *buf, size_t count) | |
238 | { | |
239 | struct i2c_client *client = to_i2c_client(dev); | |
240 | struct max6650_data *data = i2c_get_clientdata(client); | |
241 | int rpm = simple_strtoul(buf, NULL, 10); | |
242 | int kscale, ktach; | |
243 | ||
244 | rpm = SENSORS_LIMIT(rpm, FAN_RPM_MIN, FAN_RPM_MAX); | |
245 | ||
246 | /* | |
247 | * Divide the required speed by 60 to get from rpm to rps, then | |
248 | * use the datasheet equation: | |
249 | * | |
250 | * KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1 | |
251 | */ | |
252 | ||
253 | mutex_lock(&data->update_lock); | |
254 | ||
255 | kscale = DIV_FROM_REG(data->config); | |
256 | ktach = ((clock * kscale) / (256 * rpm / 60)) - 1; | |
257 | if (ktach < 0) | |
258 | ktach = 0; | |
259 | if (ktach > 255) | |
260 | ktach = 255; | |
261 | data->speed = ktach; | |
262 | ||
263 | i2c_smbus_write_byte_data(client, MAX6650_REG_SPEED, data->speed); | |
264 | ||
265 | mutex_unlock(&data->update_lock); | |
266 | ||
267 | return count; | |
268 | } | |
269 | ||
270 | /* | |
271 | * Get/set the fan speed in open loop mode using pwm1 sysfs file. | |
272 | * Speed is given as a relative value from 0 to 255, where 255 is maximum | |
273 | * speed. Note that this is done by writing directly to the chip's DAC, | |
274 | * it won't change the closed loop speed set by fan1_target. | |
275 | * Also note that due to rounding errors it is possible that you don't read | |
276 | * back exactly the value you have set. | |
277 | */ | |
278 | ||
279 | static ssize_t get_pwm(struct device *dev, struct device_attribute *devattr, | |
280 | char *buf) | |
281 | { | |
282 | int pwm; | |
283 | struct max6650_data *data = max6650_update_device(dev); | |
284 | ||
285 | /* Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans. | |
286 | Lower DAC values mean higher speeds. */ | |
287 | if (data->config & MAX6650_CFG_V12) | |
288 | pwm = 255 - (255 * (int)data->dac)/180; | |
289 | else | |
290 | pwm = 255 - (255 * (int)data->dac)/76; | |
291 | ||
292 | if (pwm < 0) | |
293 | pwm = 0; | |
294 | ||
295 | return sprintf(buf, "%d\n", pwm); | |
296 | } | |
297 | ||
298 | static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr, | |
299 | const char *buf, size_t count) | |
300 | { | |
301 | struct i2c_client *client = to_i2c_client(dev); | |
302 | struct max6650_data *data = i2c_get_clientdata(client); | |
303 | int pwm = simple_strtoul(buf, NULL, 10); | |
304 | ||
305 | pwm = SENSORS_LIMIT(pwm, 0, 255); | |
306 | ||
307 | mutex_lock(&data->update_lock); | |
308 | ||
309 | if (data->config & MAX6650_CFG_V12) | |
310 | data->dac = 180 - (180 * pwm)/255; | |
311 | else | |
312 | data->dac = 76 - (76 * pwm)/255; | |
313 | ||
314 | i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac); | |
315 | ||
316 | mutex_unlock(&data->update_lock); | |
317 | ||
318 | return count; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Get/Set controller mode: | |
323 | * Possible values: | |
324 | * 0 = Fan always on | |
325 | * 1 = Open loop, Voltage is set according to speed, not regulated. | |
326 | * 2 = Closed loop, RPM for all fans regulated by fan1 tachometer | |
327 | */ | |
328 | ||
329 | static ssize_t get_enable(struct device *dev, struct device_attribute *devattr, | |
330 | char *buf) | |
331 | { | |
332 | struct max6650_data *data = max6650_update_device(dev); | |
333 | int mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4; | |
334 | int sysfs_modes[4] = {0, 1, 2, 1}; | |
335 | ||
336 | return sprintf(buf, "%d\n", sysfs_modes[mode]); | |
337 | } | |
338 | ||
339 | static ssize_t set_enable(struct device *dev, struct device_attribute *devattr, | |
340 | const char *buf, size_t count) | |
341 | { | |
342 | struct i2c_client *client = to_i2c_client(dev); | |
343 | struct max6650_data *data = i2c_get_clientdata(client); | |
344 | int mode = simple_strtoul(buf, NULL, 10); | |
345 | int max6650_modes[3] = {0, 3, 2}; | |
346 | ||
347 | if ((mode < 0)||(mode > 2)) { | |
348 | dev_err(&client->dev, | |
349 | "illegal value for pwm1_enable (%d)\n", mode); | |
350 | return -EINVAL; | |
351 | } | |
352 | ||
353 | mutex_lock(&data->update_lock); | |
354 | ||
355 | data->config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); | |
356 | data->config = (data->config & ~MAX6650_CFG_MODE_MASK) | |
357 | | (max6650_modes[mode] << 4); | |
358 | ||
359 | i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, data->config); | |
360 | ||
361 | mutex_unlock(&data->update_lock); | |
362 | ||
363 | return count; | |
364 | } | |
365 | ||
366 | /* | |
367 | * Read/write functions for fan1_div sysfs file. The MAX6650 has no such | |
368 | * divider. We handle this by converting between divider and counttime: | |
369 | * | |
370 | * (counttime == k) <==> (divider == 2^k), k = 0, 1, 2, or 3 | |
371 | * | |
372 | * Lower values of k allow to connect a faster fan without the risk of | |
373 | * counter overflow. The price is lower resolution. You can also set counttime | |
374 | * using the module parameter. Note that the module parameter "prescaler" also | |
375 | * influences the behaviour. Unfortunately, there's no sysfs attribute | |
376 | * defined for that. See the data sheet for details. | |
377 | */ | |
378 | ||
379 | static ssize_t get_div(struct device *dev, struct device_attribute *devattr, | |
380 | char *buf) | |
381 | { | |
382 | struct max6650_data *data = max6650_update_device(dev); | |
383 | ||
384 | return sprintf(buf, "%d\n", DIV_FROM_REG(data->count)); | |
385 | } | |
386 | ||
387 | static ssize_t set_div(struct device *dev, struct device_attribute *devattr, | |
388 | const char *buf, size_t count) | |
389 | { | |
390 | struct i2c_client *client = to_i2c_client(dev); | |
391 | struct max6650_data *data = i2c_get_clientdata(client); | |
392 | int div = simple_strtoul(buf, NULL, 10); | |
393 | ||
394 | mutex_lock(&data->update_lock); | |
395 | switch (div) { | |
396 | case 1: | |
397 | data->count = 0; | |
398 | break; | |
399 | case 2: | |
400 | data->count = 1; | |
401 | break; | |
402 | case 4: | |
403 | data->count = 2; | |
404 | break; | |
405 | case 8: | |
406 | data->count = 3; | |
407 | break; | |
408 | default: | |
025dc740 | 409 | mutex_unlock(&data->update_lock); |
d20620de HJK |
410 | dev_err(&client->dev, |
411 | "illegal value for fan divider (%d)\n", div); | |
412 | return -EINVAL; | |
413 | } | |
414 | ||
415 | i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count); | |
416 | mutex_unlock(&data->update_lock); | |
417 | ||
418 | return count; | |
419 | } | |
420 | ||
52b5226f CE |
421 | /* |
422 | * Get alarm stati: | |
423 | * Possible values: | |
424 | * 0 = no alarm | |
425 | * 1 = alarm | |
426 | */ | |
427 | ||
428 | static ssize_t get_alarm(struct device *dev, struct device_attribute *devattr, | |
429 | char *buf) | |
430 | { | |
431 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
432 | struct max6650_data *data = max6650_update_device(dev); | |
433 | struct i2c_client *client = to_i2c_client(dev); | |
434 | int alarm = 0; | |
435 | ||
436 | if (data->alarm & attr->index) { | |
437 | mutex_lock(&data->update_lock); | |
438 | alarm = 1; | |
439 | data->alarm &= ~attr->index; | |
440 | data->alarm |= i2c_smbus_read_byte_data(client, | |
441 | MAX6650_REG_ALARM); | |
442 | mutex_unlock(&data->update_lock); | |
443 | } | |
444 | ||
445 | return sprintf(buf, "%d\n", alarm); | |
446 | } | |
447 | ||
d20620de HJK |
448 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0); |
449 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1); | |
450 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2); | |
451 | static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3); | |
452 | static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, get_target, set_target); | |
453 | static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_div, set_div); | |
454 | static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, get_enable, set_enable); | |
455 | static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm); | |
52b5226f CE |
456 | static SENSOR_DEVICE_ATTR(fan1_max_alarm, S_IRUGO, get_alarm, NULL, |
457 | MAX6650_ALRM_MAX); | |
458 | static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, get_alarm, NULL, | |
459 | MAX6650_ALRM_MIN); | |
460 | static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_alarm, NULL, | |
461 | MAX6650_ALRM_TACH); | |
462 | static SENSOR_DEVICE_ATTR(gpio1_alarm, S_IRUGO, get_alarm, NULL, | |
463 | MAX6650_ALRM_GPIO1); | |
464 | static SENSOR_DEVICE_ATTR(gpio2_alarm, S_IRUGO, get_alarm, NULL, | |
465 | MAX6650_ALRM_GPIO2); | |
466 | ||
467 | static mode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a, | |
468 | int n) | |
469 | { | |
470 | struct device *dev = container_of(kobj, struct device, kobj); | |
471 | struct i2c_client *client = to_i2c_client(dev); | |
472 | u8 alarm_en = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN); | |
473 | struct device_attribute *devattr; | |
d20620de | 474 | |
52b5226f CE |
475 | /* |
476 | * Hide the alarms that have not been enabled by the firmware | |
477 | */ | |
478 | ||
479 | devattr = container_of(a, struct device_attribute, attr); | |
480 | if (devattr == &sensor_dev_attr_fan1_max_alarm.dev_attr | |
481 | || devattr == &sensor_dev_attr_fan1_min_alarm.dev_attr | |
482 | || devattr == &sensor_dev_attr_fan1_fault.dev_attr | |
483 | || devattr == &sensor_dev_attr_gpio1_alarm.dev_attr | |
484 | || devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) { | |
485 | if (!(alarm_en & to_sensor_dev_attr(devattr)->index)) | |
486 | return 0; | |
487 | } | |
488 | ||
489 | return a->mode; | |
490 | } | |
d20620de HJK |
491 | |
492 | static struct attribute *max6650_attrs[] = { | |
493 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
d20620de HJK |
494 | &dev_attr_fan1_target.attr, |
495 | &dev_attr_fan1_div.attr, | |
496 | &dev_attr_pwm1_enable.attr, | |
497 | &dev_attr_pwm1.attr, | |
52b5226f CE |
498 | &sensor_dev_attr_fan1_max_alarm.dev_attr.attr, |
499 | &sensor_dev_attr_fan1_min_alarm.dev_attr.attr, | |
500 | &sensor_dev_attr_fan1_fault.dev_attr.attr, | |
501 | &sensor_dev_attr_gpio1_alarm.dev_attr.attr, | |
502 | &sensor_dev_attr_gpio2_alarm.dev_attr.attr, | |
d20620de HJK |
503 | NULL |
504 | }; | |
505 | ||
506 | static struct attribute_group max6650_attr_grp = { | |
507 | .attrs = max6650_attrs, | |
52b5226f | 508 | .is_visible = max6650_attrs_visible, |
d20620de HJK |
509 | }; |
510 | ||
9c084dae JD |
511 | static struct attribute *max6651_attrs[] = { |
512 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
513 | &sensor_dev_attr_fan3_input.dev_attr.attr, | |
514 | &sensor_dev_attr_fan4_input.dev_attr.attr, | |
515 | NULL | |
516 | }; | |
517 | ||
518 | static const struct attribute_group max6651_attr_grp = { | |
519 | .attrs = max6651_attrs, | |
520 | }; | |
521 | ||
d20620de HJK |
522 | /* |
523 | * Real code | |
524 | */ | |
525 | ||
0d57abd5 JD |
526 | static int max6650_probe(struct i2c_client *client, |
527 | const struct i2c_device_id *id) | |
528 | { | |
529 | struct max6650_data *data; | |
530 | int err; | |
531 | ||
532 | if (!(data = kzalloc(sizeof(struct max6650_data), GFP_KERNEL))) { | |
533 | dev_err(&client->dev, "out of memory.\n"); | |
534 | return -ENOMEM; | |
d20620de HJK |
535 | } |
536 | ||
0d57abd5 JD |
537 | i2c_set_clientdata(client, data); |
538 | mutex_init(&data->update_lock); | |
9c084dae | 539 | data->nr_fans = id->driver_data; |
0d57abd5 | 540 | |
d20620de HJK |
541 | /* |
542 | * Initialize the max6650 chip | |
543 | */ | |
0d57abd5 JD |
544 | err = max6650_init_client(client); |
545 | if (err) | |
546 | goto err_free; | |
d20620de HJK |
547 | |
548 | err = sysfs_create_group(&client->dev.kobj, &max6650_attr_grp); | |
549 | if (err) | |
0d57abd5 | 550 | goto err_free; |
9c084dae JD |
551 | /* 3 additional fan inputs for the MAX6651 */ |
552 | if (data->nr_fans == 4) { | |
553 | err = sysfs_create_group(&client->dev.kobj, &max6651_attr_grp); | |
554 | if (err) | |
555 | goto err_remove; | |
556 | } | |
d20620de | 557 | |
1beeffe4 TJ |
558 | data->hwmon_dev = hwmon_device_register(&client->dev); |
559 | if (!IS_ERR(data->hwmon_dev)) | |
d20620de HJK |
560 | return 0; |
561 | ||
1beeffe4 | 562 | err = PTR_ERR(data->hwmon_dev); |
d20620de | 563 | dev_err(&client->dev, "error registering hwmon device.\n"); |
9c084dae JD |
564 | if (data->nr_fans == 4) |
565 | sysfs_remove_group(&client->dev.kobj, &max6651_attr_grp); | |
566 | err_remove: | |
d20620de | 567 | sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp); |
d20620de HJK |
568 | err_free: |
569 | kfree(data); | |
570 | return err; | |
571 | } | |
572 | ||
0d57abd5 | 573 | static int max6650_remove(struct i2c_client *client) |
d20620de HJK |
574 | { |
575 | struct max6650_data *data = i2c_get_clientdata(client); | |
d20620de | 576 | |
1beeffe4 | 577 | hwmon_device_unregister(data->hwmon_dev); |
9c084dae JD |
578 | if (data->nr_fans == 4) |
579 | sysfs_remove_group(&client->dev.kobj, &max6651_attr_grp); | |
580 | sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp); | |
0d57abd5 JD |
581 | kfree(data); |
582 | return 0; | |
d20620de HJK |
583 | } |
584 | ||
585 | static int max6650_init_client(struct i2c_client *client) | |
586 | { | |
587 | struct max6650_data *data = i2c_get_clientdata(client); | |
588 | int config; | |
589 | int err = -EIO; | |
590 | ||
591 | config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); | |
592 | ||
593 | if (config < 0) { | |
594 | dev_err(&client->dev, "Error reading config, aborting.\n"); | |
595 | return err; | |
596 | } | |
597 | ||
598 | switch (fan_voltage) { | |
599 | case 0: | |
600 | break; | |
601 | case 5: | |
602 | config &= ~MAX6650_CFG_V12; | |
603 | break; | |
604 | case 12: | |
605 | config |= MAX6650_CFG_V12; | |
606 | break; | |
607 | default: | |
608 | dev_err(&client->dev, | |
609 | "illegal value for fan_voltage (%d)\n", | |
610 | fan_voltage); | |
611 | } | |
612 | ||
613 | dev_info(&client->dev, "Fan voltage is set to %dV.\n", | |
614 | (config & MAX6650_CFG_V12) ? 12 : 5); | |
615 | ||
616 | switch (prescaler) { | |
617 | case 0: | |
618 | break; | |
619 | case 1: | |
620 | config &= ~MAX6650_CFG_PRESCALER_MASK; | |
621 | break; | |
622 | case 2: | |
623 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
624 | | MAX6650_CFG_PRESCALER_2; | |
625 | break; | |
626 | case 4: | |
627 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
628 | | MAX6650_CFG_PRESCALER_4; | |
629 | break; | |
630 | case 8: | |
631 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
632 | | MAX6650_CFG_PRESCALER_8; | |
633 | break; | |
634 | case 16: | |
635 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
636 | | MAX6650_CFG_PRESCALER_16; | |
637 | break; | |
638 | default: | |
639 | dev_err(&client->dev, | |
640 | "illegal value for prescaler (%d)\n", | |
641 | prescaler); | |
642 | } | |
643 | ||
644 | dev_info(&client->dev, "Prescaler is set to %d.\n", | |
645 | 1 << (config & MAX6650_CFG_PRESCALER_MASK)); | |
646 | ||
647 | /* If mode is set to "full off", we change it to "open loop" and | |
648 | * set DAC to 255, which has the same effect. We do this because | |
649 | * there's no "full off" mode defined in hwmon specifcations. | |
650 | */ | |
651 | ||
652 | if ((config & MAX6650_CFG_MODE_MASK) == MAX6650_CFG_MODE_OFF) { | |
653 | dev_dbg(&client->dev, "Change mode to open loop, full off.\n"); | |
654 | config = (config & ~MAX6650_CFG_MODE_MASK) | |
655 | | MAX6650_CFG_MODE_OPEN_LOOP; | |
656 | if (i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, 255)) { | |
657 | dev_err(&client->dev, "DAC write error, aborting.\n"); | |
658 | return err; | |
659 | } | |
660 | } | |
661 | ||
662 | if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) { | |
663 | dev_err(&client->dev, "Config write error, aborting.\n"); | |
664 | return err; | |
665 | } | |
666 | ||
667 | data->config = config; | |
668 | data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT); | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | static const u8 tach_reg[] = { | |
674 | MAX6650_REG_TACH0, | |
675 | MAX6650_REG_TACH1, | |
676 | MAX6650_REG_TACH2, | |
677 | MAX6650_REG_TACH3, | |
678 | }; | |
679 | ||
680 | static struct max6650_data *max6650_update_device(struct device *dev) | |
681 | { | |
682 | int i; | |
683 | struct i2c_client *client = to_i2c_client(dev); | |
684 | struct max6650_data *data = i2c_get_clientdata(client); | |
685 | ||
686 | mutex_lock(&data->update_lock); | |
687 | ||
688 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
689 | data->speed = i2c_smbus_read_byte_data(client, | |
690 | MAX6650_REG_SPEED); | |
691 | data->config = i2c_smbus_read_byte_data(client, | |
692 | MAX6650_REG_CONFIG); | |
9c084dae | 693 | for (i = 0; i < data->nr_fans; i++) { |
d20620de HJK |
694 | data->tach[i] = i2c_smbus_read_byte_data(client, |
695 | tach_reg[i]); | |
696 | } | |
697 | data->count = i2c_smbus_read_byte_data(client, | |
698 | MAX6650_REG_COUNT); | |
699 | data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC); | |
700 | ||
52b5226f CE |
701 | /* Alarms are cleared on read in case the condition that |
702 | * caused the alarm is removed. Keep the value latched here | |
703 | * for providing the register through different alarm files. */ | |
704 | data->alarm |= i2c_smbus_read_byte_data(client, | |
705 | MAX6650_REG_ALARM); | |
706 | ||
d20620de HJK |
707 | data->last_updated = jiffies; |
708 | data->valid = 1; | |
709 | } | |
710 | ||
711 | mutex_unlock(&data->update_lock); | |
712 | ||
713 | return data; | |
714 | } | |
715 | ||
716 | static int __init sensors_max6650_init(void) | |
717 | { | |
718 | return i2c_add_driver(&max6650_driver); | |
719 | } | |
720 | ||
721 | static void __exit sensors_max6650_exit(void) | |
722 | { | |
723 | i2c_del_driver(&max6650_driver); | |
724 | } | |
725 | ||
726 | MODULE_AUTHOR("Hans J. Koch"); | |
727 | MODULE_DESCRIPTION("MAX6650 sensor driver"); | |
728 | MODULE_LICENSE("GPL"); | |
729 | ||
730 | module_init(sensors_max6650_init); | |
731 | module_exit(sensors_max6650_exit); |