Commit | Line | Data |
---|---|---|
d20620de HJK |
1 | /* |
2 | * max6650.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | * monitoring. | |
4 | * | |
5 | * (C) 2007 by Hans J. Koch <hjk@linutronix.de> | |
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 | ||
43 | /* | |
44 | * Addresses to scan. There are four disjoint possibilities, by pin config. | |
45 | */ | |
46 | ||
25e9c86d MH |
47 | static const unsigned short normal_i2c[] = {0x1b, 0x1f, 0x48, 0x4b, |
48 | I2C_CLIENT_END}; | |
d20620de HJK |
49 | |
50 | /* | |
51 | * Insmod parameters | |
52 | */ | |
53 | ||
54 | /* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */ | |
55 | static int fan_voltage; | |
56 | /* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */ | |
57 | static int prescaler; | |
58 | /* clock: The clock frequency of the chip the driver should assume */ | |
59 | static int clock = 254000; | |
60 | ||
61 | module_param(fan_voltage, int, S_IRUGO); | |
62 | module_param(prescaler, int, S_IRUGO); | |
63 | module_param(clock, int, S_IRUGO); | |
64 | ||
65 | I2C_CLIENT_INSMOD_1(max6650); | |
66 | ||
67 | /* | |
68 | * MAX 6650/6651 registers | |
69 | */ | |
70 | ||
71 | #define MAX6650_REG_SPEED 0x00 | |
72 | #define MAX6650_REG_CONFIG 0x02 | |
73 | #define MAX6650_REG_GPIO_DEF 0x04 | |
74 | #define MAX6650_REG_DAC 0x06 | |
75 | #define MAX6650_REG_ALARM_EN 0x08 | |
76 | #define MAX6650_REG_ALARM 0x0A | |
77 | #define MAX6650_REG_TACH0 0x0C | |
78 | #define MAX6650_REG_TACH1 0x0E | |
79 | #define MAX6650_REG_TACH2 0x10 | |
80 | #define MAX6650_REG_TACH3 0x12 | |
81 | #define MAX6650_REG_GPIO_STAT 0x14 | |
82 | #define MAX6650_REG_COUNT 0x16 | |
83 | ||
84 | /* | |
85 | * Config register bits | |
86 | */ | |
87 | ||
88 | #define MAX6650_CFG_V12 0x08 | |
89 | #define MAX6650_CFG_PRESCALER_MASK 0x07 | |
90 | #define MAX6650_CFG_PRESCALER_2 0x01 | |
91 | #define MAX6650_CFG_PRESCALER_4 0x02 | |
92 | #define MAX6650_CFG_PRESCALER_8 0x03 | |
93 | #define MAX6650_CFG_PRESCALER_16 0x04 | |
94 | #define MAX6650_CFG_MODE_MASK 0x30 | |
95 | #define MAX6650_CFG_MODE_ON 0x00 | |
96 | #define MAX6650_CFG_MODE_OFF 0x10 | |
97 | #define MAX6650_CFG_MODE_CLOSED_LOOP 0x20 | |
98 | #define MAX6650_CFG_MODE_OPEN_LOOP 0x30 | |
99 | #define MAX6650_COUNT_MASK 0x03 | |
100 | ||
52b5226f CE |
101 | /* |
102 | * Alarm status register bits | |
103 | */ | |
104 | ||
105 | #define MAX6650_ALRM_MAX 0x01 | |
106 | #define MAX6650_ALRM_MIN 0x02 | |
107 | #define MAX6650_ALRM_TACH 0x04 | |
108 | #define MAX6650_ALRM_GPIO1 0x08 | |
109 | #define MAX6650_ALRM_GPIO2 0x10 | |
110 | ||
d20620de HJK |
111 | /* Minimum and maximum values of the FAN-RPM */ |
112 | #define FAN_RPM_MIN 240 | |
113 | #define FAN_RPM_MAX 30000 | |
114 | ||
115 | #define DIV_FROM_REG(reg) (1 << (reg & 7)) | |
116 | ||
0d57abd5 JD |
117 | static int max6650_probe(struct i2c_client *client, |
118 | const struct i2c_device_id *id); | |
119 | static int max6650_detect(struct i2c_client *client, int kind, | |
120 | struct i2c_board_info *info); | |
d20620de | 121 | static int max6650_init_client(struct i2c_client *client); |
0d57abd5 | 122 | static int max6650_remove(struct i2c_client *client); |
d20620de HJK |
123 | static struct max6650_data *max6650_update_device(struct device *dev); |
124 | ||
125 | /* | |
126 | * Driver data (common to all clients) | |
127 | */ | |
128 | ||
0d57abd5 JD |
129 | static const struct i2c_device_id max6650_id[] = { |
130 | { "max6650", max6650 }, | |
131 | { } | |
132 | }; | |
133 | MODULE_DEVICE_TABLE(i2c, max6650_id); | |
134 | ||
d20620de | 135 | static struct i2c_driver max6650_driver = { |
0d57abd5 | 136 | .class = I2C_CLASS_HWMON, |
d20620de HJK |
137 | .driver = { |
138 | .name = "max6650", | |
139 | }, | |
0d57abd5 JD |
140 | .probe = max6650_probe, |
141 | .remove = max6650_remove, | |
142 | .id_table = max6650_id, | |
143 | .detect = max6650_detect, | |
144 | .address_data = &addr_data, | |
d20620de HJK |
145 | }; |
146 | ||
147 | /* | |
148 | * Client data (each client gets its own) | |
149 | */ | |
150 | ||
151 | struct max6650_data | |
152 | { | |
1beeffe4 | 153 | struct device *hwmon_dev; |
d20620de HJK |
154 | struct mutex update_lock; |
155 | char valid; /* zero until following fields are valid */ | |
156 | unsigned long last_updated; /* in jiffies */ | |
157 | ||
158 | /* register values */ | |
159 | u8 speed; | |
160 | u8 config; | |
161 | u8 tach[4]; | |
162 | u8 count; | |
163 | u8 dac; | |
52b5226f | 164 | u8 alarm; |
d20620de HJK |
165 | }; |
166 | ||
167 | static ssize_t get_fan(struct device *dev, struct device_attribute *devattr, | |
168 | char *buf) | |
169 | { | |
170 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
171 | struct max6650_data *data = max6650_update_device(dev); | |
172 | int rpm; | |
173 | ||
174 | /* | |
175 | * Calculation details: | |
176 | * | |
177 | * Each tachometer counts over an interval given by the "count" | |
178 | * register (0.25, 0.5, 1 or 2 seconds). This module assumes | |
179 | * that the fans produce two pulses per revolution (this seems | |
180 | * to be the most common). | |
181 | */ | |
182 | ||
183 | rpm = ((data->tach[attr->index] * 120) / DIV_FROM_REG(data->count)); | |
184 | return sprintf(buf, "%d\n", rpm); | |
185 | } | |
186 | ||
187 | /* | |
188 | * Set the fan speed to the specified RPM (or read back the RPM setting). | |
189 | * This works in closed loop mode only. Use pwm1 for open loop speed setting. | |
190 | * | |
191 | * The MAX6650/1 will automatically control fan speed when in closed loop | |
192 | * mode. | |
193 | * | |
194 | * Assumptions: | |
195 | * | |
196 | * 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use | |
197 | * the clock module parameter if you need to fine tune this. | |
198 | * | |
199 | * 2) The prescaler (low three bits of the config register) has already | |
200 | * been set to an appropriate value. Use the prescaler module parameter | |
201 | * if your BIOS doesn't initialize the chip properly. | |
202 | * | |
203 | * The relevant equations are given on pages 21 and 22 of the datasheet. | |
204 | * | |
205 | * From the datasheet, the relevant equation when in regulation is: | |
206 | * | |
207 | * [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE | |
208 | * | |
209 | * where: | |
210 | * | |
211 | * fCLK is the oscillator frequency (either the 254kHz internal | |
212 | * oscillator or the externally applied clock) | |
213 | * | |
214 | * KTACH is the value in the speed register | |
215 | * | |
216 | * FanSpeed is the speed of the fan in rps | |
217 | * | |
218 | * KSCALE is the prescaler value (1, 2, 4, 8, or 16) | |
219 | * | |
220 | * When reading, we need to solve for FanSpeed. When writing, we need to | |
221 | * solve for KTACH. | |
222 | * | |
223 | * Note: this tachometer is completely separate from the tachometers | |
224 | * used to measure the fan speeds. Only one fan's speed (fan1) is | |
225 | * controlled. | |
226 | */ | |
227 | ||
228 | static ssize_t get_target(struct device *dev, struct device_attribute *devattr, | |
229 | char *buf) | |
230 | { | |
231 | struct max6650_data *data = max6650_update_device(dev); | |
232 | int kscale, ktach, rpm; | |
233 | ||
234 | /* | |
235 | * Use the datasheet equation: | |
236 | * | |
237 | * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)] | |
238 | * | |
239 | * then multiply by 60 to give rpm. | |
240 | */ | |
241 | ||
242 | kscale = DIV_FROM_REG(data->config); | |
243 | ktach = data->speed; | |
244 | rpm = 60 * kscale * clock / (256 * (ktach + 1)); | |
245 | return sprintf(buf, "%d\n", rpm); | |
246 | } | |
247 | ||
248 | static ssize_t set_target(struct device *dev, struct device_attribute *devattr, | |
249 | const char *buf, size_t count) | |
250 | { | |
251 | struct i2c_client *client = to_i2c_client(dev); | |
252 | struct max6650_data *data = i2c_get_clientdata(client); | |
253 | int rpm = simple_strtoul(buf, NULL, 10); | |
254 | int kscale, ktach; | |
255 | ||
256 | rpm = SENSORS_LIMIT(rpm, FAN_RPM_MIN, FAN_RPM_MAX); | |
257 | ||
258 | /* | |
259 | * Divide the required speed by 60 to get from rpm to rps, then | |
260 | * use the datasheet equation: | |
261 | * | |
262 | * KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1 | |
263 | */ | |
264 | ||
265 | mutex_lock(&data->update_lock); | |
266 | ||
267 | kscale = DIV_FROM_REG(data->config); | |
268 | ktach = ((clock * kscale) / (256 * rpm / 60)) - 1; | |
269 | if (ktach < 0) | |
270 | ktach = 0; | |
271 | if (ktach > 255) | |
272 | ktach = 255; | |
273 | data->speed = ktach; | |
274 | ||
275 | i2c_smbus_write_byte_data(client, MAX6650_REG_SPEED, data->speed); | |
276 | ||
277 | mutex_unlock(&data->update_lock); | |
278 | ||
279 | return count; | |
280 | } | |
281 | ||
282 | /* | |
283 | * Get/set the fan speed in open loop mode using pwm1 sysfs file. | |
284 | * Speed is given as a relative value from 0 to 255, where 255 is maximum | |
285 | * speed. Note that this is done by writing directly to the chip's DAC, | |
286 | * it won't change the closed loop speed set by fan1_target. | |
287 | * Also note that due to rounding errors it is possible that you don't read | |
288 | * back exactly the value you have set. | |
289 | */ | |
290 | ||
291 | static ssize_t get_pwm(struct device *dev, struct device_attribute *devattr, | |
292 | char *buf) | |
293 | { | |
294 | int pwm; | |
295 | struct max6650_data *data = max6650_update_device(dev); | |
296 | ||
297 | /* Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans. | |
298 | Lower DAC values mean higher speeds. */ | |
299 | if (data->config & MAX6650_CFG_V12) | |
300 | pwm = 255 - (255 * (int)data->dac)/180; | |
301 | else | |
302 | pwm = 255 - (255 * (int)data->dac)/76; | |
303 | ||
304 | if (pwm < 0) | |
305 | pwm = 0; | |
306 | ||
307 | return sprintf(buf, "%d\n", pwm); | |
308 | } | |
309 | ||
310 | static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr, | |
311 | const char *buf, size_t count) | |
312 | { | |
313 | struct i2c_client *client = to_i2c_client(dev); | |
314 | struct max6650_data *data = i2c_get_clientdata(client); | |
315 | int pwm = simple_strtoul(buf, NULL, 10); | |
316 | ||
317 | pwm = SENSORS_LIMIT(pwm, 0, 255); | |
318 | ||
319 | mutex_lock(&data->update_lock); | |
320 | ||
321 | if (data->config & MAX6650_CFG_V12) | |
322 | data->dac = 180 - (180 * pwm)/255; | |
323 | else | |
324 | data->dac = 76 - (76 * pwm)/255; | |
325 | ||
326 | i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac); | |
327 | ||
328 | mutex_unlock(&data->update_lock); | |
329 | ||
330 | return count; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Get/Set controller mode: | |
335 | * Possible values: | |
336 | * 0 = Fan always on | |
337 | * 1 = Open loop, Voltage is set according to speed, not regulated. | |
338 | * 2 = Closed loop, RPM for all fans regulated by fan1 tachometer | |
339 | */ | |
340 | ||
341 | static ssize_t get_enable(struct device *dev, struct device_attribute *devattr, | |
342 | char *buf) | |
343 | { | |
344 | struct max6650_data *data = max6650_update_device(dev); | |
345 | int mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4; | |
346 | int sysfs_modes[4] = {0, 1, 2, 1}; | |
347 | ||
348 | return sprintf(buf, "%d\n", sysfs_modes[mode]); | |
349 | } | |
350 | ||
351 | static ssize_t set_enable(struct device *dev, struct device_attribute *devattr, | |
352 | const char *buf, size_t count) | |
353 | { | |
354 | struct i2c_client *client = to_i2c_client(dev); | |
355 | struct max6650_data *data = i2c_get_clientdata(client); | |
356 | int mode = simple_strtoul(buf, NULL, 10); | |
357 | int max6650_modes[3] = {0, 3, 2}; | |
358 | ||
359 | if ((mode < 0)||(mode > 2)) { | |
360 | dev_err(&client->dev, | |
361 | "illegal value for pwm1_enable (%d)\n", mode); | |
362 | return -EINVAL; | |
363 | } | |
364 | ||
365 | mutex_lock(&data->update_lock); | |
366 | ||
367 | data->config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); | |
368 | data->config = (data->config & ~MAX6650_CFG_MODE_MASK) | |
369 | | (max6650_modes[mode] << 4); | |
370 | ||
371 | i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, data->config); | |
372 | ||
373 | mutex_unlock(&data->update_lock); | |
374 | ||
375 | return count; | |
376 | } | |
377 | ||
378 | /* | |
379 | * Read/write functions for fan1_div sysfs file. The MAX6650 has no such | |
380 | * divider. We handle this by converting between divider and counttime: | |
381 | * | |
382 | * (counttime == k) <==> (divider == 2^k), k = 0, 1, 2, or 3 | |
383 | * | |
384 | * Lower values of k allow to connect a faster fan without the risk of | |
385 | * counter overflow. The price is lower resolution. You can also set counttime | |
386 | * using the module parameter. Note that the module parameter "prescaler" also | |
387 | * influences the behaviour. Unfortunately, there's no sysfs attribute | |
388 | * defined for that. See the data sheet for details. | |
389 | */ | |
390 | ||
391 | static ssize_t get_div(struct device *dev, struct device_attribute *devattr, | |
392 | char *buf) | |
393 | { | |
394 | struct max6650_data *data = max6650_update_device(dev); | |
395 | ||
396 | return sprintf(buf, "%d\n", DIV_FROM_REG(data->count)); | |
397 | } | |
398 | ||
399 | static ssize_t set_div(struct device *dev, struct device_attribute *devattr, | |
400 | const char *buf, size_t count) | |
401 | { | |
402 | struct i2c_client *client = to_i2c_client(dev); | |
403 | struct max6650_data *data = i2c_get_clientdata(client); | |
404 | int div = simple_strtoul(buf, NULL, 10); | |
405 | ||
406 | mutex_lock(&data->update_lock); | |
407 | switch (div) { | |
408 | case 1: | |
409 | data->count = 0; | |
410 | break; | |
411 | case 2: | |
412 | data->count = 1; | |
413 | break; | |
414 | case 4: | |
415 | data->count = 2; | |
416 | break; | |
417 | case 8: | |
418 | data->count = 3; | |
419 | break; | |
420 | default: | |
025dc740 | 421 | mutex_unlock(&data->update_lock); |
d20620de HJK |
422 | dev_err(&client->dev, |
423 | "illegal value for fan divider (%d)\n", div); | |
424 | return -EINVAL; | |
425 | } | |
426 | ||
427 | i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count); | |
428 | mutex_unlock(&data->update_lock); | |
429 | ||
430 | return count; | |
431 | } | |
432 | ||
52b5226f CE |
433 | /* |
434 | * Get alarm stati: | |
435 | * Possible values: | |
436 | * 0 = no alarm | |
437 | * 1 = alarm | |
438 | */ | |
439 | ||
440 | static ssize_t get_alarm(struct device *dev, struct device_attribute *devattr, | |
441 | char *buf) | |
442 | { | |
443 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
444 | struct max6650_data *data = max6650_update_device(dev); | |
445 | struct i2c_client *client = to_i2c_client(dev); | |
446 | int alarm = 0; | |
447 | ||
448 | if (data->alarm & attr->index) { | |
449 | mutex_lock(&data->update_lock); | |
450 | alarm = 1; | |
451 | data->alarm &= ~attr->index; | |
452 | data->alarm |= i2c_smbus_read_byte_data(client, | |
453 | MAX6650_REG_ALARM); | |
454 | mutex_unlock(&data->update_lock); | |
455 | } | |
456 | ||
457 | return sprintf(buf, "%d\n", alarm); | |
458 | } | |
459 | ||
d20620de HJK |
460 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0); |
461 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1); | |
462 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2); | |
463 | static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3); | |
464 | static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, get_target, set_target); | |
465 | static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_div, set_div); | |
466 | static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, get_enable, set_enable); | |
467 | static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm); | |
52b5226f CE |
468 | static SENSOR_DEVICE_ATTR(fan1_max_alarm, S_IRUGO, get_alarm, NULL, |
469 | MAX6650_ALRM_MAX); | |
470 | static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, get_alarm, NULL, | |
471 | MAX6650_ALRM_MIN); | |
472 | static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_alarm, NULL, | |
473 | MAX6650_ALRM_TACH); | |
474 | static SENSOR_DEVICE_ATTR(gpio1_alarm, S_IRUGO, get_alarm, NULL, | |
475 | MAX6650_ALRM_GPIO1); | |
476 | static SENSOR_DEVICE_ATTR(gpio2_alarm, S_IRUGO, get_alarm, NULL, | |
477 | MAX6650_ALRM_GPIO2); | |
478 | ||
479 | static mode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a, | |
480 | int n) | |
481 | { | |
482 | struct device *dev = container_of(kobj, struct device, kobj); | |
483 | struct i2c_client *client = to_i2c_client(dev); | |
484 | u8 alarm_en = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN); | |
485 | struct device_attribute *devattr; | |
d20620de | 486 | |
52b5226f CE |
487 | /* |
488 | * Hide the alarms that have not been enabled by the firmware | |
489 | */ | |
490 | ||
491 | devattr = container_of(a, struct device_attribute, attr); | |
492 | if (devattr == &sensor_dev_attr_fan1_max_alarm.dev_attr | |
493 | || devattr == &sensor_dev_attr_fan1_min_alarm.dev_attr | |
494 | || devattr == &sensor_dev_attr_fan1_fault.dev_attr | |
495 | || devattr == &sensor_dev_attr_gpio1_alarm.dev_attr | |
496 | || devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) { | |
497 | if (!(alarm_en & to_sensor_dev_attr(devattr)->index)) | |
498 | return 0; | |
499 | } | |
500 | ||
501 | return a->mode; | |
502 | } | |
d20620de HJK |
503 | |
504 | static struct attribute *max6650_attrs[] = { | |
505 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
506 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
507 | &sensor_dev_attr_fan3_input.dev_attr.attr, | |
508 | &sensor_dev_attr_fan4_input.dev_attr.attr, | |
509 | &dev_attr_fan1_target.attr, | |
510 | &dev_attr_fan1_div.attr, | |
511 | &dev_attr_pwm1_enable.attr, | |
512 | &dev_attr_pwm1.attr, | |
52b5226f CE |
513 | &sensor_dev_attr_fan1_max_alarm.dev_attr.attr, |
514 | &sensor_dev_attr_fan1_min_alarm.dev_attr.attr, | |
515 | &sensor_dev_attr_fan1_fault.dev_attr.attr, | |
516 | &sensor_dev_attr_gpio1_alarm.dev_attr.attr, | |
517 | &sensor_dev_attr_gpio2_alarm.dev_attr.attr, | |
d20620de HJK |
518 | NULL |
519 | }; | |
520 | ||
521 | static struct attribute_group max6650_attr_grp = { | |
522 | .attrs = max6650_attrs, | |
52b5226f | 523 | .is_visible = max6650_attrs_visible, |
d20620de HJK |
524 | }; |
525 | ||
526 | /* | |
527 | * Real code | |
528 | */ | |
529 | ||
0d57abd5 JD |
530 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
531 | static int max6650_detect(struct i2c_client *client, int kind, | |
532 | struct i2c_board_info *info) | |
d20620de | 533 | { |
0d57abd5 JD |
534 | struct i2c_adapter *adapter = client->adapter; |
535 | int address = client->addr; | |
d20620de HJK |
536 | |
537 | dev_dbg(&adapter->dev, "max6650_detect called, kind = %d\n", kind); | |
538 | ||
539 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { | |
540 | dev_dbg(&adapter->dev, "max6650: I2C bus doesn't support " | |
541 | "byte read mode, skipping.\n"); | |
0d57abd5 | 542 | return -ENODEV; |
d20620de HJK |
543 | } |
544 | ||
d20620de HJK |
545 | /* |
546 | * Now we do the remaining detection. A negative kind means that | |
547 | * the driver was loaded with no force parameter (default), so we | |
548 | * must both detect and identify the chip (actually there is only | |
549 | * one possible kind of chip for now, max6650). A zero kind means that | |
550 | * the driver was loaded with the force parameter, the detection | |
551 | * step shall be skipped. A positive kind means that the driver | |
552 | * was loaded with the force parameter and a given kind of chip is | |
553 | * requested, so both the detection and the identification steps | |
554 | * are skipped. | |
555 | * | |
556 | * Currently I can find no way to distinguish between a MAX6650 and | |
557 | * a MAX6651. This driver has only been tried on the former. | |
558 | */ | |
559 | ||
560 | if ((kind < 0) && | |
561 | ( (i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG) & 0xC0) | |
562 | ||(i2c_smbus_read_byte_data(client, MAX6650_REG_GPIO_STAT) & 0xE0) | |
563 | ||(i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN) & 0xE0) | |
564 | ||(i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM) & 0xE0) | |
565 | ||(i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT) & 0xFC))) { | |
566 | dev_dbg(&adapter->dev, | |
567 | "max6650: detection failed at 0x%02x.\n", address); | |
0d57abd5 | 568 | return -ENODEV; |
d20620de HJK |
569 | } |
570 | ||
571 | dev_info(&adapter->dev, "max6650: chip found at 0x%02x.\n", address); | |
572 | ||
0d57abd5 | 573 | strlcpy(info->type, "max6650", I2C_NAME_SIZE); |
d20620de | 574 | |
0d57abd5 JD |
575 | return 0; |
576 | } | |
577 | ||
578 | static int max6650_probe(struct i2c_client *client, | |
579 | const struct i2c_device_id *id) | |
580 | { | |
581 | struct max6650_data *data; | |
582 | int err; | |
583 | ||
584 | if (!(data = kzalloc(sizeof(struct max6650_data), GFP_KERNEL))) { | |
585 | dev_err(&client->dev, "out of memory.\n"); | |
586 | return -ENOMEM; | |
d20620de HJK |
587 | } |
588 | ||
0d57abd5 JD |
589 | i2c_set_clientdata(client, data); |
590 | mutex_init(&data->update_lock); | |
591 | ||
d20620de HJK |
592 | /* |
593 | * Initialize the max6650 chip | |
594 | */ | |
0d57abd5 JD |
595 | err = max6650_init_client(client); |
596 | if (err) | |
597 | goto err_free; | |
d20620de HJK |
598 | |
599 | err = sysfs_create_group(&client->dev.kobj, &max6650_attr_grp); | |
600 | if (err) | |
0d57abd5 | 601 | goto err_free; |
d20620de | 602 | |
1beeffe4 TJ |
603 | data->hwmon_dev = hwmon_device_register(&client->dev); |
604 | if (!IS_ERR(data->hwmon_dev)) | |
d20620de HJK |
605 | return 0; |
606 | ||
1beeffe4 | 607 | err = PTR_ERR(data->hwmon_dev); |
d20620de HJK |
608 | dev_err(&client->dev, "error registering hwmon device.\n"); |
609 | sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp); | |
d20620de HJK |
610 | err_free: |
611 | kfree(data); | |
612 | return err; | |
613 | } | |
614 | ||
0d57abd5 | 615 | static int max6650_remove(struct i2c_client *client) |
d20620de HJK |
616 | { |
617 | struct max6650_data *data = i2c_get_clientdata(client); | |
d20620de HJK |
618 | |
619 | sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp); | |
1beeffe4 | 620 | hwmon_device_unregister(data->hwmon_dev); |
0d57abd5 JD |
621 | kfree(data); |
622 | return 0; | |
d20620de HJK |
623 | } |
624 | ||
625 | static int max6650_init_client(struct i2c_client *client) | |
626 | { | |
627 | struct max6650_data *data = i2c_get_clientdata(client); | |
628 | int config; | |
629 | int err = -EIO; | |
630 | ||
631 | config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); | |
632 | ||
633 | if (config < 0) { | |
634 | dev_err(&client->dev, "Error reading config, aborting.\n"); | |
635 | return err; | |
636 | } | |
637 | ||
638 | switch (fan_voltage) { | |
639 | case 0: | |
640 | break; | |
641 | case 5: | |
642 | config &= ~MAX6650_CFG_V12; | |
643 | break; | |
644 | case 12: | |
645 | config |= MAX6650_CFG_V12; | |
646 | break; | |
647 | default: | |
648 | dev_err(&client->dev, | |
649 | "illegal value for fan_voltage (%d)\n", | |
650 | fan_voltage); | |
651 | } | |
652 | ||
653 | dev_info(&client->dev, "Fan voltage is set to %dV.\n", | |
654 | (config & MAX6650_CFG_V12) ? 12 : 5); | |
655 | ||
656 | switch (prescaler) { | |
657 | case 0: | |
658 | break; | |
659 | case 1: | |
660 | config &= ~MAX6650_CFG_PRESCALER_MASK; | |
661 | break; | |
662 | case 2: | |
663 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
664 | | MAX6650_CFG_PRESCALER_2; | |
665 | break; | |
666 | case 4: | |
667 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
668 | | MAX6650_CFG_PRESCALER_4; | |
669 | break; | |
670 | case 8: | |
671 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
672 | | MAX6650_CFG_PRESCALER_8; | |
673 | break; | |
674 | case 16: | |
675 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
676 | | MAX6650_CFG_PRESCALER_16; | |
677 | break; | |
678 | default: | |
679 | dev_err(&client->dev, | |
680 | "illegal value for prescaler (%d)\n", | |
681 | prescaler); | |
682 | } | |
683 | ||
684 | dev_info(&client->dev, "Prescaler is set to %d.\n", | |
685 | 1 << (config & MAX6650_CFG_PRESCALER_MASK)); | |
686 | ||
687 | /* If mode is set to "full off", we change it to "open loop" and | |
688 | * set DAC to 255, which has the same effect. We do this because | |
689 | * there's no "full off" mode defined in hwmon specifcations. | |
690 | */ | |
691 | ||
692 | if ((config & MAX6650_CFG_MODE_MASK) == MAX6650_CFG_MODE_OFF) { | |
693 | dev_dbg(&client->dev, "Change mode to open loop, full off.\n"); | |
694 | config = (config & ~MAX6650_CFG_MODE_MASK) | |
695 | | MAX6650_CFG_MODE_OPEN_LOOP; | |
696 | if (i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, 255)) { | |
697 | dev_err(&client->dev, "DAC write error, aborting.\n"); | |
698 | return err; | |
699 | } | |
700 | } | |
701 | ||
702 | if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) { | |
703 | dev_err(&client->dev, "Config write error, aborting.\n"); | |
704 | return err; | |
705 | } | |
706 | ||
707 | data->config = config; | |
708 | data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT); | |
709 | ||
710 | return 0; | |
711 | } | |
712 | ||
713 | static const u8 tach_reg[] = { | |
714 | MAX6650_REG_TACH0, | |
715 | MAX6650_REG_TACH1, | |
716 | MAX6650_REG_TACH2, | |
717 | MAX6650_REG_TACH3, | |
718 | }; | |
719 | ||
720 | static struct max6650_data *max6650_update_device(struct device *dev) | |
721 | { | |
722 | int i; | |
723 | struct i2c_client *client = to_i2c_client(dev); | |
724 | struct max6650_data *data = i2c_get_clientdata(client); | |
725 | ||
726 | mutex_lock(&data->update_lock); | |
727 | ||
728 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
729 | data->speed = i2c_smbus_read_byte_data(client, | |
730 | MAX6650_REG_SPEED); | |
731 | data->config = i2c_smbus_read_byte_data(client, | |
732 | MAX6650_REG_CONFIG); | |
733 | for (i = 0; i < 4; i++) { | |
734 | data->tach[i] = i2c_smbus_read_byte_data(client, | |
735 | tach_reg[i]); | |
736 | } | |
737 | data->count = i2c_smbus_read_byte_data(client, | |
738 | MAX6650_REG_COUNT); | |
739 | data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC); | |
740 | ||
52b5226f CE |
741 | /* Alarms are cleared on read in case the condition that |
742 | * caused the alarm is removed. Keep the value latched here | |
743 | * for providing the register through different alarm files. */ | |
744 | data->alarm |= i2c_smbus_read_byte_data(client, | |
745 | MAX6650_REG_ALARM); | |
746 | ||
d20620de HJK |
747 | data->last_updated = jiffies; |
748 | data->valid = 1; | |
749 | } | |
750 | ||
751 | mutex_unlock(&data->update_lock); | |
752 | ||
753 | return data; | |
754 | } | |
755 | ||
756 | static int __init sensors_max6650_init(void) | |
757 | { | |
758 | return i2c_add_driver(&max6650_driver); | |
759 | } | |
760 | ||
761 | static void __exit sensors_max6650_exit(void) | |
762 | { | |
763 | i2c_del_driver(&max6650_driver); | |
764 | } | |
765 | ||
766 | MODULE_AUTHOR("Hans J. Koch"); | |
767 | MODULE_DESCRIPTION("MAX6650 sensor driver"); | |
768 | MODULE_LICENSE("GPL"); | |
769 | ||
770 | module_init(sensors_max6650_init); | |
771 | module_exit(sensors_max6650_exit); |