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Hans-Juergen Kochd20620d2007-05-08 17:22:00 +02001/*
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 *
Christian Engelmayer52b52262009-06-15 18:39:52 +020015 * The datasheet was last seen at:
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +020016 *
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
Mark M. Hoffman25e9c862008-02-17 22:28:03 -050047static const unsigned short normal_i2c[] = {0x1b, 0x1f, 0x48, 0x4b,
48 I2C_CLIENT_END};
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +020049
50/*
51 * Insmod parameters
52 */
53
54/* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */
55static int fan_voltage;
56/* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */
57static int prescaler;
58/* clock: The clock frequency of the chip the driver should assume */
59static int clock = 254000;
60
61module_param(fan_voltage, int, S_IRUGO);
62module_param(prescaler, int, S_IRUGO);
63module_param(clock, int, S_IRUGO);
64
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +020065/*
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
Christian Engelmayer52b52262009-06-15 18:39:52 +020099/*
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
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200109/* 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
Jean Delvare0d57abd2008-07-16 19:30:16 +0200115static int max6650_probe(struct i2c_client *client,
116 const struct i2c_device_id *id);
Jean Delvare310ec792009-12-14 21:17:23 +0100117static int max6650_detect(struct i2c_client *client,
Jean Delvare0d57abd2008-07-16 19:30:16 +0200118 struct i2c_board_info *info);
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200119static int max6650_init_client(struct i2c_client *client);
Jean Delvare0d57abd2008-07-16 19:30:16 +0200120static int max6650_remove(struct i2c_client *client);
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200121static struct max6650_data *max6650_update_device(struct device *dev);
122
123/*
124 * Driver data (common to all clients)
125 */
126
Jean Delvare0d57abd2008-07-16 19:30:16 +0200127static const struct i2c_device_id max6650_id[] = {
Jean Delvare1f86df42009-12-14 21:17:26 +0100128 { "max6650", 0 },
Jean Delvare0d57abd2008-07-16 19:30:16 +0200129 { }
130};
131MODULE_DEVICE_TABLE(i2c, max6650_id);
132
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200133static struct i2c_driver max6650_driver = {
Jean Delvare0d57abd2008-07-16 19:30:16 +0200134 .class = I2C_CLASS_HWMON,
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200135 .driver = {
136 .name = "max6650",
137 },
Jean Delvare0d57abd2008-07-16 19:30:16 +0200138 .probe = max6650_probe,
139 .remove = max6650_remove,
140 .id_table = max6650_id,
141 .detect = max6650_detect,
Jean Delvarec3813d62009-12-14 21:17:25 +0100142 .address_list = normal_i2c,
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200143};
144
145/*
146 * Client data (each client gets its own)
147 */
148
149struct max6650_data
150{
Tony Jones1beeffe2007-08-20 13:46:20 -0700151 struct device *hwmon_dev;
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200152 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;
Christian Engelmayer52b52262009-06-15 18:39:52 +0200162 u8 alarm;
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200163};
164
165static 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
226static 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
246static 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
289static 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
308static 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
339static 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
349static 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
389static 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
397static 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:
Jiri Slaby025dc742009-07-11 13:42:37 +0200419 mutex_unlock(&data->update_lock);
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200420 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
Christian Engelmayer52b52262009-06-15 18:39:52 +0200431/*
432 * Get alarm stati:
433 * Possible values:
434 * 0 = no alarm
435 * 1 = alarm
436 */
437
438static 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
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200458static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0);
459static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1);
460static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2);
461static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3);
462static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, get_target, set_target);
463static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_div, set_div);
464static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, get_enable, set_enable);
465static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm);
Christian Engelmayer52b52262009-06-15 18:39:52 +0200466static SENSOR_DEVICE_ATTR(fan1_max_alarm, S_IRUGO, get_alarm, NULL,
467 MAX6650_ALRM_MAX);
468static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, get_alarm, NULL,
469 MAX6650_ALRM_MIN);
470static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_alarm, NULL,
471 MAX6650_ALRM_TACH);
472static SENSOR_DEVICE_ATTR(gpio1_alarm, S_IRUGO, get_alarm, NULL,
473 MAX6650_ALRM_GPIO1);
474static SENSOR_DEVICE_ATTR(gpio2_alarm, S_IRUGO, get_alarm, NULL,
475 MAX6650_ALRM_GPIO2);
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200476
Christian Engelmayer52b52262009-06-15 18:39:52 +0200477static 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;
484
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}
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200501
502static 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,
Christian Engelmayer52b52262009-06-15 18:39:52 +0200511 &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,
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200516 NULL
517};
518
519static struct attribute_group max6650_attr_grp = {
520 .attrs = max6650_attrs,
Christian Engelmayer52b52262009-06-15 18:39:52 +0200521 .is_visible = max6650_attrs_visible,
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200522};
523
524/*
525 * Real code
526 */
527
Jean Delvare0d57abd2008-07-16 19:30:16 +0200528/* Return 0 if detection is successful, -ENODEV otherwise */
Jean Delvare310ec792009-12-14 21:17:23 +0100529static int max6650_detect(struct i2c_client *client,
Jean Delvare0d57abd2008-07-16 19:30:16 +0200530 struct i2c_board_info *info)
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200531{
Jean Delvare0d57abd2008-07-16 19:30:16 +0200532 struct i2c_adapter *adapter = client->adapter;
533 int address = client->addr;
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200534
Jean Delvare52df6442009-12-09 20:35:57 +0100535 dev_dbg(&adapter->dev, "max6650_detect called\n");
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200536
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");
Jean Delvare0d57abd2008-07-16 19:30:16 +0200540 return -ENODEV;
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200541 }
542
Jean Delvare52df6442009-12-09 20:35:57 +0100543 if (((i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG) & 0xC0)
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200544 ||(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);
Jean Delvare0d57abd2008-07-16 19:30:16 +0200550 return -ENODEV;
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200551 }
552
553 dev_info(&adapter->dev, "max6650: chip found at 0x%02x.\n", address);
554
Jean Delvare0d57abd2008-07-16 19:30:16 +0200555 strlcpy(info->type, "max6650", I2C_NAME_SIZE);
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200556
Jean Delvare0d57abd2008-07-16 19:30:16 +0200557 return 0;
558}
559
560static 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;
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200569 }
570
Jean Delvare0d57abd2008-07-16 19:30:16 +0200571 i2c_set_clientdata(client, data);
572 mutex_init(&data->update_lock);
573
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200574 /*
575 * Initialize the max6650 chip
576 */
Jean Delvare0d57abd2008-07-16 19:30:16 +0200577 err = max6650_init_client(client);
578 if (err)
579 goto err_free;
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200580
581 err = sysfs_create_group(&client->dev.kobj, &max6650_attr_grp);
582 if (err)
Jean Delvare0d57abd2008-07-16 19:30:16 +0200583 goto err_free;
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200584
Tony Jones1beeffe2007-08-20 13:46:20 -0700585 data->hwmon_dev = hwmon_device_register(&client->dev);
586 if (!IS_ERR(data->hwmon_dev))
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200587 return 0;
588
Tony Jones1beeffe2007-08-20 13:46:20 -0700589 err = PTR_ERR(data->hwmon_dev);
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200590 dev_err(&client->dev, "error registering hwmon device.\n");
591 sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp);
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200592err_free:
593 kfree(data);
594 return err;
595}
596
Jean Delvare0d57abd2008-07-16 19:30:16 +0200597static int max6650_remove(struct i2c_client *client)
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200598{
599 struct max6650_data *data = i2c_get_clientdata(client);
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200600
601 sysfs_remove_group(&client->dev.kobj, &max6650_attr_grp);
Tony Jones1beeffe2007-08-20 13:46:20 -0700602 hwmon_device_unregister(data->hwmon_dev);
Jean Delvare0d57abd2008-07-16 19:30:16 +0200603 kfree(data);
604 return 0;
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200605}
606
607static 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
695static const u8 tach_reg[] = {
696 MAX6650_REG_TACH0,
697 MAX6650_REG_TACH1,
698 MAX6650_REG_TACH2,
699 MAX6650_REG_TACH3,
700};
701
702static 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
Christian Engelmayer52b52262009-06-15 18:39:52 +0200723 /* 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
Hans-Juergen Kochd20620d2007-05-08 17:22:00 +0200729 data->last_updated = jiffies;
730 data->valid = 1;
731 }
732
733 mutex_unlock(&data->update_lock);
734
735 return data;
736}
737
738static int __init sensors_max6650_init(void)
739{
740 return i2c_add_driver(&max6650_driver);
741}
742
743static void __exit sensors_max6650_exit(void)
744{
745 i2c_del_driver(&max6650_driver);
746}
747
748MODULE_AUTHOR("Hans J. Koch");
749MODULE_DESCRIPTION("MAX6650 sensor driver");
750MODULE_LICENSE("GPL");
751
752module_init(sensors_max6650_init);
753module_exit(sensors_max6650_exit);