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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 | ||
d20620de HJK |
65 | /* |
66 | * MAX 6650/6651 registers | |
67 | */ | |
68 | ||
69 | #define MAX6650_REG_SPEED 0x00 | |
70 | #define MAX6650_REG_CONFIG 0x02 | |
71 | #define MAX6650_REG_GPIO_DEF 0x04 | |
72 | #define MAX6650_REG_DAC 0x06 | |
73 | #define MAX6650_REG_ALARM_EN 0x08 | |
74 | #define MAX6650_REG_ALARM 0x0A | |
75 | #define MAX6650_REG_TACH0 0x0C | |
76 | #define MAX6650_REG_TACH1 0x0E | |
77 | #define MAX6650_REG_TACH2 0x10 | |
78 | #define MAX6650_REG_TACH3 0x12 | |
79 | #define MAX6650_REG_GPIO_STAT 0x14 | |
80 | #define MAX6650_REG_COUNT 0x16 | |
81 | ||
82 | /* | |
83 | * Config register bits | |
84 | */ | |
85 | ||
86 | #define MAX6650_CFG_V12 0x08 | |
87 | #define MAX6650_CFG_PRESCALER_MASK 0x07 | |
88 | #define MAX6650_CFG_PRESCALER_2 0x01 | |
89 | #define MAX6650_CFG_PRESCALER_4 0x02 | |
90 | #define MAX6650_CFG_PRESCALER_8 0x03 | |
91 | #define MAX6650_CFG_PRESCALER_16 0x04 | |
92 | #define MAX6650_CFG_MODE_MASK 0x30 | |
93 | #define MAX6650_CFG_MODE_ON 0x00 | |
94 | #define MAX6650_CFG_MODE_OFF 0x10 | |
95 | #define MAX6650_CFG_MODE_CLOSED_LOOP 0x20 | |
96 | #define MAX6650_CFG_MODE_OPEN_LOOP 0x30 | |
97 | #define MAX6650_COUNT_MASK 0x03 | |
98 | ||
52b5226f CE |
99 | /* |
100 | * Alarm status register bits | |
101 | */ | |
102 | ||
103 | #define MAX6650_ALRM_MAX 0x01 | |
104 | #define MAX6650_ALRM_MIN 0x02 | |
105 | #define MAX6650_ALRM_TACH 0x04 | |
106 | #define MAX6650_ALRM_GPIO1 0x08 | |
107 | #define MAX6650_ALRM_GPIO2 0x10 | |
108 | ||
d20620de HJK |
109 | /* Minimum and maximum values of the FAN-RPM */ |
110 | #define FAN_RPM_MIN 240 | |
111 | #define FAN_RPM_MAX 30000 | |
112 | ||
113 | #define DIV_FROM_REG(reg) (1 << (reg & 7)) | |
114 | ||
0d57abd5 JD |
115 | static int max6650_probe(struct i2c_client *client, |
116 | const struct i2c_device_id *id); | |
310ec792 | 117 | static int max6650_detect(struct i2c_client *client, |
0d57abd5 | 118 | struct i2c_board_info *info); |
d20620de | 119 | static int max6650_init_client(struct i2c_client *client); |
0d57abd5 | 120 | static int max6650_remove(struct i2c_client *client); |
d20620de HJK |
121 | static struct max6650_data *max6650_update_device(struct device *dev); |
122 | ||
123 | /* | |
124 | * Driver data (common to all clients) | |
125 | */ | |
126 | ||
0d57abd5 | 127 | static const struct i2c_device_id max6650_id[] = { |
1f86df49 | 128 | { "max6650", 0 }, |
0d57abd5 JD |
129 | { } |
130 | }; | |
131 | MODULE_DEVICE_TABLE(i2c, max6650_id); | |
132 | ||
d20620de | 133 | static struct i2c_driver max6650_driver = { |
0d57abd5 | 134 | .class = I2C_CLASS_HWMON, |
d20620de HJK |
135 | .driver = { |
136 | .name = "max6650", | |
137 | }, | |
0d57abd5 JD |
138 | .probe = max6650_probe, |
139 | .remove = max6650_remove, | |
140 | .id_table = max6650_id, | |
141 | .detect = max6650_detect, | |
c3813d6a | 142 | .address_list = normal_i2c, |
d20620de HJK |
143 | }; |
144 | ||
145 | /* | |
146 | * Client data (each client gets its own) | |
147 | */ | |
148 | ||
149 | struct max6650_data | |
150 | { | |
1beeffe4 | 151 | struct device *hwmon_dev; |
d20620de HJK |
152 | struct mutex update_lock; |
153 | char valid; /* zero until following fields are valid */ | |
154 | unsigned long last_updated; /* in jiffies */ | |
155 | ||
156 | /* register values */ | |
157 | u8 speed; | |
158 | u8 config; | |
159 | u8 tach[4]; | |
160 | u8 count; | |
161 | u8 dac; | |
52b5226f | 162 | u8 alarm; |
d20620de HJK |
163 | }; |
164 | ||
165 | static ssize_t get_fan(struct device *dev, struct device_attribute *devattr, | |
166 | char *buf) | |
167 | { | |
168 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
169 | struct max6650_data *data = max6650_update_device(dev); | |
170 | int rpm; | |
171 | ||
172 | /* | |
173 | * Calculation details: | |
174 | * | |
175 | * Each tachometer counts over an interval given by the "count" | |
176 | * register (0.25, 0.5, 1 or 2 seconds). This module assumes | |
177 | * that the fans produce two pulses per revolution (this seems | |
178 | * to be the most common). | |
179 | */ | |
180 | ||
181 | rpm = ((data->tach[attr->index] * 120) / DIV_FROM_REG(data->count)); | |
182 | return sprintf(buf, "%d\n", rpm); | |
183 | } | |
184 | ||
185 | /* | |
186 | * Set the fan speed to the specified RPM (or read back the RPM setting). | |
187 | * This works in closed loop mode only. Use pwm1 for open loop speed setting. | |
188 | * | |
189 | * The MAX6650/1 will automatically control fan speed when in closed loop | |
190 | * mode. | |
191 | * | |
192 | * Assumptions: | |
193 | * | |
194 | * 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use | |
195 | * the clock module parameter if you need to fine tune this. | |
196 | * | |
197 | * 2) The prescaler (low three bits of the config register) has already | |
198 | * been set to an appropriate value. Use the prescaler module parameter | |
199 | * if your BIOS doesn't initialize the chip properly. | |
200 | * | |
201 | * The relevant equations are given on pages 21 and 22 of the datasheet. | |
202 | * | |
203 | * From the datasheet, the relevant equation when in regulation is: | |
204 | * | |
205 | * [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE | |
206 | * | |
207 | * where: | |
208 | * | |
209 | * fCLK is the oscillator frequency (either the 254kHz internal | |
210 | * oscillator or the externally applied clock) | |
211 | * | |
212 | * KTACH is the value in the speed register | |
213 | * | |
214 | * FanSpeed is the speed of the fan in rps | |
215 | * | |
216 | * KSCALE is the prescaler value (1, 2, 4, 8, or 16) | |
217 | * | |
218 | * When reading, we need to solve for FanSpeed. When writing, we need to | |
219 | * solve for KTACH. | |
220 | * | |
221 | * Note: this tachometer is completely separate from the tachometers | |
222 | * used to measure the fan speeds. Only one fan's speed (fan1) is | |
223 | * controlled. | |
224 | */ | |
225 | ||
226 | static ssize_t get_target(struct device *dev, struct device_attribute *devattr, | |
227 | char *buf) | |
228 | { | |
229 | struct max6650_data *data = max6650_update_device(dev); | |
230 | int kscale, ktach, rpm; | |
231 | ||
232 | /* | |
233 | * Use the datasheet equation: | |
234 | * | |
235 | * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)] | |
236 | * | |
237 | * then multiply by 60 to give rpm. | |
238 | */ | |
239 | ||
240 | kscale = DIV_FROM_REG(data->config); | |
241 | ktach = data->speed; | |
242 | rpm = 60 * kscale * clock / (256 * (ktach + 1)); | |
243 | return sprintf(buf, "%d\n", rpm); | |
244 | } | |
245 | ||
246 | static ssize_t set_target(struct device *dev, struct device_attribute *devattr, | |
247 | const char *buf, size_t count) | |
248 | { | |
249 | struct i2c_client *client = to_i2c_client(dev); | |
250 | struct max6650_data *data = i2c_get_clientdata(client); | |
251 | int rpm = simple_strtoul(buf, NULL, 10); | |
252 | int kscale, ktach; | |
253 | ||
254 | rpm = SENSORS_LIMIT(rpm, FAN_RPM_MIN, FAN_RPM_MAX); | |
255 | ||
256 | /* | |
257 | * Divide the required speed by 60 to get from rpm to rps, then | |
258 | * use the datasheet equation: | |
259 | * | |
260 | * KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1 | |
261 | */ | |
262 | ||
263 | mutex_lock(&data->update_lock); | |
264 | ||
265 | kscale = DIV_FROM_REG(data->config); | |
266 | ktach = ((clock * kscale) / (256 * rpm / 60)) - 1; | |
267 | if (ktach < 0) | |
268 | ktach = 0; | |
269 | if (ktach > 255) | |
270 | ktach = 255; | |
271 | data->speed = ktach; | |
272 | ||
273 | i2c_smbus_write_byte_data(client, MAX6650_REG_SPEED, data->speed); | |
274 | ||
275 | mutex_unlock(&data->update_lock); | |
276 | ||
277 | return count; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Get/set the fan speed in open loop mode using pwm1 sysfs file. | |
282 | * Speed is given as a relative value from 0 to 255, where 255 is maximum | |
283 | * speed. Note that this is done by writing directly to the chip's DAC, | |
284 | * it won't change the closed loop speed set by fan1_target. | |
285 | * Also note that due to rounding errors it is possible that you don't read | |
286 | * back exactly the value you have set. | |
287 | */ | |
288 | ||
289 | static ssize_t get_pwm(struct device *dev, struct device_attribute *devattr, | |
290 | char *buf) | |
291 | { | |
292 | int pwm; | |
293 | struct max6650_data *data = max6650_update_device(dev); | |
294 | ||
295 | /* Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans. | |
296 | Lower DAC values mean higher speeds. */ | |
297 | if (data->config & MAX6650_CFG_V12) | |
298 | pwm = 255 - (255 * (int)data->dac)/180; | |
299 | else | |
300 | pwm = 255 - (255 * (int)data->dac)/76; | |
301 | ||
302 | if (pwm < 0) | |
303 | pwm = 0; | |
304 | ||
305 | return sprintf(buf, "%d\n", pwm); | |
306 | } | |
307 | ||
308 | static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr, | |
309 | const char *buf, size_t count) | |
310 | { | |
311 | struct i2c_client *client = to_i2c_client(dev); | |
312 | struct max6650_data *data = i2c_get_clientdata(client); | |
313 | int pwm = simple_strtoul(buf, NULL, 10); | |
314 | ||
315 | pwm = SENSORS_LIMIT(pwm, 0, 255); | |
316 | ||
317 | mutex_lock(&data->update_lock); | |
318 | ||
319 | if (data->config & MAX6650_CFG_V12) | |
320 | data->dac = 180 - (180 * pwm)/255; | |
321 | else | |
322 | data->dac = 76 - (76 * pwm)/255; | |
323 | ||
324 | i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac); | |
325 | ||
326 | mutex_unlock(&data->update_lock); | |
327 | ||
328 | return count; | |
329 | } | |
330 | ||
331 | /* | |
332 | * Get/Set controller mode: | |
333 | * Possible values: | |
334 | * 0 = Fan always on | |
335 | * 1 = Open loop, Voltage is set according to speed, not regulated. | |
336 | * 2 = Closed loop, RPM for all fans regulated by fan1 tachometer | |
337 | */ | |
338 | ||
339 | static ssize_t get_enable(struct device *dev, struct device_attribute *devattr, | |
340 | char *buf) | |
341 | { | |
342 | struct max6650_data *data = max6650_update_device(dev); | |
343 | int mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4; | |
344 | int sysfs_modes[4] = {0, 1, 2, 1}; | |
345 | ||
346 | return sprintf(buf, "%d\n", sysfs_modes[mode]); | |
347 | } | |
348 | ||
349 | static ssize_t set_enable(struct device *dev, struct device_attribute *devattr, | |
350 | const char *buf, size_t count) | |
351 | { | |
352 | struct i2c_client *client = to_i2c_client(dev); | |
353 | struct max6650_data *data = i2c_get_clientdata(client); | |
354 | int mode = simple_strtoul(buf, NULL, 10); | |
355 | int max6650_modes[3] = {0, 3, 2}; | |
356 | ||
357 | if ((mode < 0)||(mode > 2)) { | |
358 | dev_err(&client->dev, | |
359 | "illegal value for pwm1_enable (%d)\n", mode); | |
360 | return -EINVAL; | |
361 | } | |
362 | ||
363 | mutex_lock(&data->update_lock); | |
364 | ||
365 | data->config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); | |
366 | data->config = (data->config & ~MAX6650_CFG_MODE_MASK) | |
367 | | (max6650_modes[mode] << 4); | |
368 | ||
369 | i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, data->config); | |
370 | ||
371 | mutex_unlock(&data->update_lock); | |
372 | ||
373 | return count; | |
374 | } | |
375 | ||
376 | /* | |
377 | * Read/write functions for fan1_div sysfs file. The MAX6650 has no such | |
378 | * divider. We handle this by converting between divider and counttime: | |
379 | * | |
380 | * (counttime == k) <==> (divider == 2^k), k = 0, 1, 2, or 3 | |
381 | * | |
382 | * Lower values of k allow to connect a faster fan without the risk of | |
383 | * counter overflow. The price is lower resolution. You can also set counttime | |
384 | * using the module parameter. Note that the module parameter "prescaler" also | |
385 | * influences the behaviour. Unfortunately, there's no sysfs attribute | |
386 | * defined for that. See the data sheet for details. | |
387 | */ | |
388 | ||
389 | static ssize_t get_div(struct device *dev, struct device_attribute *devattr, | |
390 | char *buf) | |
391 | { | |
392 | struct max6650_data *data = max6650_update_device(dev); | |
393 | ||
394 | return sprintf(buf, "%d\n", DIV_FROM_REG(data->count)); | |
395 | } | |
396 | ||
397 | static ssize_t set_div(struct device *dev, struct device_attribute *devattr, | |
398 | const char *buf, size_t count) | |
399 | { | |
400 | struct i2c_client *client = to_i2c_client(dev); | |
401 | struct max6650_data *data = i2c_get_clientdata(client); | |
402 | int div = simple_strtoul(buf, NULL, 10); | |
403 | ||
404 | mutex_lock(&data->update_lock); | |
405 | switch (div) { | |
406 | case 1: | |
407 | data->count = 0; | |
408 | break; | |
409 | case 2: | |
410 | data->count = 1; | |
411 | break; | |
412 | case 4: | |
413 | data->count = 2; | |
414 | break; | |
415 | case 8: | |
416 | data->count = 3; | |
417 | break; | |
418 | default: | |
025dc740 | 419 | mutex_unlock(&data->update_lock); |
d20620de HJK |
420 | dev_err(&client->dev, |
421 | "illegal value for fan divider (%d)\n", div); | |
422 | return -EINVAL; | |
423 | } | |
424 | ||
425 | i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count); | |
426 | mutex_unlock(&data->update_lock); | |
427 | ||
428 | return count; | |
429 | } | |
430 | ||
52b5226f CE |
431 | /* |
432 | * Get alarm stati: | |
433 | * Possible values: | |
434 | * 0 = no alarm | |
435 | * 1 = alarm | |
436 | */ | |
437 | ||
438 | static ssize_t get_alarm(struct device *dev, struct device_attribute *devattr, | |
439 | char *buf) | |
440 | { | |
441 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
442 | struct max6650_data *data = max6650_update_device(dev); | |
443 | struct i2c_client *client = to_i2c_client(dev); | |
444 | int alarm = 0; | |
445 | ||
446 | if (data->alarm & attr->index) { | |
447 | mutex_lock(&data->update_lock); | |
448 | alarm = 1; | |
449 | data->alarm &= ~attr->index; | |
450 | data->alarm |= i2c_smbus_read_byte_data(client, | |
451 | MAX6650_REG_ALARM); | |
452 | mutex_unlock(&data->update_lock); | |
453 | } | |
454 | ||
455 | return sprintf(buf, "%d\n", alarm); | |
456 | } | |
457 | ||
d20620de HJK |
458 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0); |
459 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1); | |
460 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2); | |
461 | static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3); | |
462 | static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, get_target, set_target); | |
463 | static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_div, set_div); | |
464 | static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, get_enable, set_enable); | |
465 | static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm); | |
52b5226f CE |
466 | static SENSOR_DEVICE_ATTR(fan1_max_alarm, S_IRUGO, get_alarm, NULL, |
467 | MAX6650_ALRM_MAX); | |
468 | static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, get_alarm, NULL, | |
469 | MAX6650_ALRM_MIN); | |
470 | static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_alarm, NULL, | |
471 | MAX6650_ALRM_TACH); | |
472 | static SENSOR_DEVICE_ATTR(gpio1_alarm, S_IRUGO, get_alarm, NULL, | |
473 | MAX6650_ALRM_GPIO1); | |
474 | static SENSOR_DEVICE_ATTR(gpio2_alarm, S_IRUGO, get_alarm, NULL, | |
475 | MAX6650_ALRM_GPIO2); | |
476 | ||
477 | static mode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a, | |
478 | int n) | |
479 | { | |
480 | struct device *dev = container_of(kobj, struct device, kobj); | |
481 | struct i2c_client *client = to_i2c_client(dev); | |
482 | u8 alarm_en = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN); | |
483 | struct device_attribute *devattr; | |
d20620de | 484 | |
52b5226f CE |
485 | /* |
486 | * Hide the alarms that have not been enabled by the firmware | |
487 | */ | |
488 | ||
489 | devattr = container_of(a, struct device_attribute, attr); | |
490 | if (devattr == &sensor_dev_attr_fan1_max_alarm.dev_attr | |
491 | || devattr == &sensor_dev_attr_fan1_min_alarm.dev_attr | |
492 | || devattr == &sensor_dev_attr_fan1_fault.dev_attr | |
493 | || devattr == &sensor_dev_attr_gpio1_alarm.dev_attr | |
494 | || devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) { | |
495 | if (!(alarm_en & to_sensor_dev_attr(devattr)->index)) | |
496 | return 0; | |
497 | } | |
498 | ||
499 | return a->mode; | |
500 | } | |
d20620de HJK |
501 | |
502 | static struct attribute *max6650_attrs[] = { | |
503 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
504 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
505 | &sensor_dev_attr_fan3_input.dev_attr.attr, | |
506 | &sensor_dev_attr_fan4_input.dev_attr.attr, | |
507 | &dev_attr_fan1_target.attr, | |
508 | &dev_attr_fan1_div.attr, | |
509 | &dev_attr_pwm1_enable.attr, | |
510 | &dev_attr_pwm1.attr, | |
52b5226f CE |
511 | &sensor_dev_attr_fan1_max_alarm.dev_attr.attr, |
512 | &sensor_dev_attr_fan1_min_alarm.dev_attr.attr, | |
513 | &sensor_dev_attr_fan1_fault.dev_attr.attr, | |
514 | &sensor_dev_attr_gpio1_alarm.dev_attr.attr, | |
515 | &sensor_dev_attr_gpio2_alarm.dev_attr.attr, | |
d20620de HJK |
516 | NULL |
517 | }; | |
518 | ||
519 | static struct attribute_group max6650_attr_grp = { | |
520 | .attrs = max6650_attrs, | |
52b5226f | 521 | .is_visible = max6650_attrs_visible, |
d20620de HJK |
522 | }; |
523 | ||
524 | /* | |
525 | * Real code | |
526 | */ | |
527 | ||
0d57abd5 | 528 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 529 | static int max6650_detect(struct i2c_client *client, |
0d57abd5 | 530 | struct i2c_board_info *info) |
d20620de | 531 | { |
0d57abd5 JD |
532 | struct i2c_adapter *adapter = client->adapter; |
533 | int address = client->addr; | |
d20620de | 534 | |
52df6440 | 535 | dev_dbg(&adapter->dev, "max6650_detect called\n"); |
d20620de HJK |
536 | |
537 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { | |
538 | dev_dbg(&adapter->dev, "max6650: I2C bus doesn't support " | |
539 | "byte read mode, skipping.\n"); | |
0d57abd5 | 540 | return -ENODEV; |
d20620de HJK |
541 | } |
542 | ||
52df6440 | 543 | if (((i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG) & 0xC0) |
d20620de HJK |
544 | ||(i2c_smbus_read_byte_data(client, MAX6650_REG_GPIO_STAT) & 0xE0) |
545 | ||(i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN) & 0xE0) | |
546 | ||(i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM) & 0xE0) | |
547 | ||(i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT) & 0xFC))) { | |
548 | dev_dbg(&adapter->dev, | |
549 | "max6650: detection failed at 0x%02x.\n", address); | |
0d57abd5 | 550 | return -ENODEV; |
d20620de HJK |
551 | } |
552 | ||
553 | dev_info(&adapter->dev, "max6650: chip found at 0x%02x.\n", address); | |
554 | ||
0d57abd5 | 555 | strlcpy(info->type, "max6650", I2C_NAME_SIZE); |
d20620de | 556 | |
0d57abd5 JD |
557 | return 0; |
558 | } | |
559 | ||
560 | static int max6650_probe(struct i2c_client *client, | |
561 | const struct i2c_device_id *id) | |
562 | { | |
563 | struct max6650_data *data; | |
564 | int err; | |
565 | ||
566 | if (!(data = kzalloc(sizeof(struct max6650_data), GFP_KERNEL))) { | |
567 | dev_err(&client->dev, "out of memory.\n"); | |
568 | return -ENOMEM; | |
d20620de HJK |
569 | } |
570 | ||
0d57abd5 JD |
571 | i2c_set_clientdata(client, data); |
572 | mutex_init(&data->update_lock); | |
573 | ||
d20620de HJK |
574 | /* |
575 | * Initialize the max6650 chip | |
576 | */ | |
0d57abd5 JD |
577 | err = max6650_init_client(client); |
578 | if (err) | |
579 | goto err_free; | |
d20620de HJK |
580 | |
581 | err = sysfs_create_group(&client->dev.kobj, &max6650_attr_grp); | |
582 | if (err) | |
0d57abd5 | 583 | goto err_free; |
d20620de | 584 | |
1beeffe4 TJ |
585 | data->hwmon_dev = hwmon_device_register(&client->dev); |
586 | if (!IS_ERR(data->hwmon_dev)) | |
d20620de HJK |
587 | return 0; |
588 | ||
1beeffe4 | 589 | err = PTR_ERR(data->hwmon_dev); |
d20620de HJK |
590 | dev_err(&client->dev, "error registering hwmon device.\n"); |
591 | sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp); | |
d20620de HJK |
592 | err_free: |
593 | kfree(data); | |
594 | return err; | |
595 | } | |
596 | ||
0d57abd5 | 597 | static int max6650_remove(struct i2c_client *client) |
d20620de HJK |
598 | { |
599 | struct max6650_data *data = i2c_get_clientdata(client); | |
d20620de HJK |
600 | |
601 | sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp); | |
1beeffe4 | 602 | hwmon_device_unregister(data->hwmon_dev); |
0d57abd5 JD |
603 | kfree(data); |
604 | return 0; | |
d20620de HJK |
605 | } |
606 | ||
607 | static int max6650_init_client(struct i2c_client *client) | |
608 | { | |
609 | struct max6650_data *data = i2c_get_clientdata(client); | |
610 | int config; | |
611 | int err = -EIO; | |
612 | ||
613 | config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); | |
614 | ||
615 | if (config < 0) { | |
616 | dev_err(&client->dev, "Error reading config, aborting.\n"); | |
617 | return err; | |
618 | } | |
619 | ||
620 | switch (fan_voltage) { | |
621 | case 0: | |
622 | break; | |
623 | case 5: | |
624 | config &= ~MAX6650_CFG_V12; | |
625 | break; | |
626 | case 12: | |
627 | config |= MAX6650_CFG_V12; | |
628 | break; | |
629 | default: | |
630 | dev_err(&client->dev, | |
631 | "illegal value for fan_voltage (%d)\n", | |
632 | fan_voltage); | |
633 | } | |
634 | ||
635 | dev_info(&client->dev, "Fan voltage is set to %dV.\n", | |
636 | (config & MAX6650_CFG_V12) ? 12 : 5); | |
637 | ||
638 | switch (prescaler) { | |
639 | case 0: | |
640 | break; | |
641 | case 1: | |
642 | config &= ~MAX6650_CFG_PRESCALER_MASK; | |
643 | break; | |
644 | case 2: | |
645 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
646 | | MAX6650_CFG_PRESCALER_2; | |
647 | break; | |
648 | case 4: | |
649 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
650 | | MAX6650_CFG_PRESCALER_4; | |
651 | break; | |
652 | case 8: | |
653 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
654 | | MAX6650_CFG_PRESCALER_8; | |
655 | break; | |
656 | case 16: | |
657 | config = (config & ~MAX6650_CFG_PRESCALER_MASK) | |
658 | | MAX6650_CFG_PRESCALER_16; | |
659 | break; | |
660 | default: | |
661 | dev_err(&client->dev, | |
662 | "illegal value for prescaler (%d)\n", | |
663 | prescaler); | |
664 | } | |
665 | ||
666 | dev_info(&client->dev, "Prescaler is set to %d.\n", | |
667 | 1 << (config & MAX6650_CFG_PRESCALER_MASK)); | |
668 | ||
669 | /* If mode is set to "full off", we change it to "open loop" and | |
670 | * set DAC to 255, which has the same effect. We do this because | |
671 | * there's no "full off" mode defined in hwmon specifcations. | |
672 | */ | |
673 | ||
674 | if ((config & MAX6650_CFG_MODE_MASK) == MAX6650_CFG_MODE_OFF) { | |
675 | dev_dbg(&client->dev, "Change mode to open loop, full off.\n"); | |
676 | config = (config & ~MAX6650_CFG_MODE_MASK) | |
677 | | MAX6650_CFG_MODE_OPEN_LOOP; | |
678 | if (i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, 255)) { | |
679 | dev_err(&client->dev, "DAC write error, aborting.\n"); | |
680 | return err; | |
681 | } | |
682 | } | |
683 | ||
684 | if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) { | |
685 | dev_err(&client->dev, "Config write error, aborting.\n"); | |
686 | return err; | |
687 | } | |
688 | ||
689 | data->config = config; | |
690 | data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT); | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
695 | static const u8 tach_reg[] = { | |
696 | MAX6650_REG_TACH0, | |
697 | MAX6650_REG_TACH1, | |
698 | MAX6650_REG_TACH2, | |
699 | MAX6650_REG_TACH3, | |
700 | }; | |
701 | ||
702 | static struct max6650_data *max6650_update_device(struct device *dev) | |
703 | { | |
704 | int i; | |
705 | struct i2c_client *client = to_i2c_client(dev); | |
706 | struct max6650_data *data = i2c_get_clientdata(client); | |
707 | ||
708 | mutex_lock(&data->update_lock); | |
709 | ||
710 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
711 | data->speed = i2c_smbus_read_byte_data(client, | |
712 | MAX6650_REG_SPEED); | |
713 | data->config = i2c_smbus_read_byte_data(client, | |
714 | MAX6650_REG_CONFIG); | |
715 | for (i = 0; i < 4; i++) { | |
716 | data->tach[i] = i2c_smbus_read_byte_data(client, | |
717 | tach_reg[i]); | |
718 | } | |
719 | data->count = i2c_smbus_read_byte_data(client, | |
720 | MAX6650_REG_COUNT); | |
721 | data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC); | |
722 | ||
52b5226f CE |
723 | /* Alarms are cleared on read in case the condition that |
724 | * caused the alarm is removed. Keep the value latched here | |
725 | * for providing the register through different alarm files. */ | |
726 | data->alarm |= i2c_smbus_read_byte_data(client, | |
727 | MAX6650_REG_ALARM); | |
728 | ||
d20620de HJK |
729 | data->last_updated = jiffies; |
730 | data->valid = 1; | |
731 | } | |
732 | ||
733 | mutex_unlock(&data->update_lock); | |
734 | ||
735 | return data; | |
736 | } | |
737 | ||
738 | static int __init sensors_max6650_init(void) | |
739 | { | |
740 | return i2c_add_driver(&max6650_driver); | |
741 | } | |
742 | ||
743 | static void __exit sensors_max6650_exit(void) | |
744 | { | |
745 | i2c_del_driver(&max6650_driver); | |
746 | } | |
747 | ||
748 | MODULE_AUTHOR("Hans J. Koch"); | |
749 | MODULE_DESCRIPTION("MAX6650 sensor driver"); | |
750 | MODULE_LICENSE("GPL"); | |
751 | ||
752 | module_init(sensors_max6650_init); | |
753 | module_exit(sensors_max6650_exit); |