a5b79d62 |
1 | /* |
2 | * max6639.c - Support for Maxim MAX6639 |
3 | * |
4 | * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller |
5 | * |
6 | * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de> |
7 | * |
8 | * based on the initial MAX6639 support from semptian.net |
9 | * by He Changqing <hechangqing@semptian.com> |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify |
12 | * it under the terms of the GNU General Public License as published by |
13 | * the Free Software Foundation; either version 2 of the License, or |
14 | * (at your option) any later version. |
15 | * |
16 | * This program is distributed in the hope that it will be useful, |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
19 | * GNU General Public License for more details. |
20 | * |
21 | * You should have received a copy of the GNU General Public License |
22 | * along with this program; if not, write to the Free Software |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
24 | */ |
25 | |
26 | #include <linux/module.h> |
27 | #include <linux/init.h> |
28 | #include <linux/slab.h> |
29 | #include <linux/jiffies.h> |
30 | #include <linux/i2c.h> |
31 | #include <linux/hwmon.h> |
32 | #include <linux/hwmon-sysfs.h> |
33 | #include <linux/err.h> |
34 | #include <linux/mutex.h> |
35 | #include <linux/i2c/max6639.h> |
36 | |
37 | /* Addresses to scan */ |
38 | static unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END }; |
39 | |
40 | /* The MAX6639 registers, valid channel numbers: 0, 1 */ |
41 | #define MAX6639_REG_TEMP(ch) (0x00 + (ch)) |
42 | #define MAX6639_REG_STATUS 0x02 |
43 | #define MAX6639_REG_OUTPUT_MASK 0x03 |
44 | #define MAX6639_REG_GCONFIG 0x04 |
45 | #define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch)) |
46 | #define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch)) |
47 | #define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch)) |
48 | #define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch)) |
49 | #define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4) |
50 | #define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4) |
51 | #define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4) |
52 | #define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4) |
53 | #define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch)) |
54 | #define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch)) |
55 | #define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch)) |
56 | #define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch)) |
57 | #define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch)) |
58 | #define MAX6639_REG_DEVID 0x3D |
59 | #define MAX6639_REG_MANUID 0x3E |
60 | #define MAX6639_REG_DEVREV 0x3F |
61 | |
62 | /* Register bits */ |
63 | #define MAX6639_GCONFIG_STANDBY 0x80 |
64 | #define MAX6639_GCONFIG_POR 0x40 |
65 | #define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20 |
66 | #define MAX6639_GCONFIG_CH2_LOCAL 0x10 |
177f3b92 |
67 | #define MAX6639_GCONFIG_PWM_FREQ_HI 0x08 |
a5b79d62 |
68 | |
69 | #define MAX6639_FAN_CONFIG1_PWM 0x80 |
70 | |
177f3b92 |
71 | #define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40 |
72 | |
a5b79d62 |
73 | static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 }; |
74 | |
75 | #define FAN_FROM_REG(val, div, rpm_range) ((val) == 0 ? -1 : \ |
76 | (val) == 255 ? 0 : (rpm_ranges[rpm_range] * 30) / ((div + 1) * (val))) |
77 | #define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val) / 1000, 0, 255) |
78 | |
79 | /* |
80 | * Client data (each client gets its own) |
81 | */ |
82 | struct max6639_data { |
83 | struct device *hwmon_dev; |
84 | struct mutex update_lock; |
85 | char valid; /* !=0 if following fields are valid */ |
86 | unsigned long last_updated; /* In jiffies */ |
87 | |
88 | /* Register values sampled regularly */ |
89 | u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */ |
90 | bool temp_fault[2]; /* Detected temperature diode failure */ |
91 | u8 fan[2]; /* Register value: TACH count for fans >=30 */ |
92 | u8 status; /* Detected channel alarms and fan failures */ |
93 | |
94 | /* Register values only written to */ |
95 | u8 pwm[2]; /* Register value: Duty cycle 0..120 */ |
96 | u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */ |
97 | u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */ |
98 | u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */ |
99 | |
100 | /* Register values initialized only once */ |
101 | u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */ |
102 | u8 rpm_range; /* Index in above rpm_ranges table */ |
103 | }; |
104 | |
105 | static struct max6639_data *max6639_update_device(struct device *dev) |
106 | { |
107 | struct i2c_client *client = to_i2c_client(dev); |
108 | struct max6639_data *data = i2c_get_clientdata(client); |
109 | struct max6639_data *ret = data; |
110 | int i; |
111 | int status_reg; |
112 | |
113 | mutex_lock(&data->update_lock); |
114 | |
115 | if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { |
116 | int res; |
117 | |
118 | dev_dbg(&client->dev, "Starting max6639 update\n"); |
119 | |
120 | status_reg = i2c_smbus_read_byte_data(client, |
121 | MAX6639_REG_STATUS); |
122 | if (status_reg < 0) { |
123 | ret = ERR_PTR(status_reg); |
124 | goto abort; |
125 | } |
126 | |
127 | data->status = status_reg; |
128 | |
129 | for (i = 0; i < 2; i++) { |
130 | res = i2c_smbus_read_byte_data(client, |
131 | MAX6639_REG_FAN_CNT(i)); |
132 | if (res < 0) { |
133 | ret = ERR_PTR(res); |
134 | goto abort; |
135 | } |
136 | data->fan[i] = res; |
137 | |
138 | res = i2c_smbus_read_byte_data(client, |
139 | MAX6639_REG_TEMP_EXT(i)); |
140 | if (res < 0) { |
141 | ret = ERR_PTR(res); |
142 | goto abort; |
143 | } |
144 | data->temp[i] = res >> 5; |
145 | data->temp_fault[i] = res & 0x01; |
146 | |
147 | res = i2c_smbus_read_byte_data(client, |
148 | MAX6639_REG_TEMP(i)); |
149 | if (res < 0) { |
150 | ret = ERR_PTR(res); |
151 | goto abort; |
152 | } |
153 | data->temp[i] |= res << 3; |
154 | } |
155 | |
156 | data->last_updated = jiffies; |
157 | data->valid = 1; |
158 | } |
159 | abort: |
160 | mutex_unlock(&data->update_lock); |
161 | |
162 | return ret; |
163 | } |
164 | |
165 | static ssize_t show_temp_input(struct device *dev, |
166 | struct device_attribute *dev_attr, char *buf) |
167 | { |
168 | long temp; |
169 | struct max6639_data *data = max6639_update_device(dev); |
170 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
171 | |
172 | if (IS_ERR(data)) |
173 | return PTR_ERR(data); |
174 | |
175 | temp = data->temp[attr->index] * 125; |
176 | return sprintf(buf, "%ld\n", temp); |
177 | } |
178 | |
179 | static ssize_t show_temp_fault(struct device *dev, |
180 | struct device_attribute *dev_attr, char *buf) |
181 | { |
182 | struct max6639_data *data = max6639_update_device(dev); |
183 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
184 | |
185 | if (IS_ERR(data)) |
186 | return PTR_ERR(data); |
187 | |
188 | return sprintf(buf, "%d\n", data->temp_fault[attr->index]); |
189 | } |
190 | |
191 | static ssize_t show_temp_max(struct device *dev, |
192 | struct device_attribute *dev_attr, char *buf) |
193 | { |
194 | struct i2c_client *client = to_i2c_client(dev); |
195 | struct max6639_data *data = i2c_get_clientdata(client); |
196 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
197 | |
198 | return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000)); |
199 | } |
200 | |
201 | static ssize_t set_temp_max(struct device *dev, |
202 | struct device_attribute *dev_attr, |
203 | const char *buf, size_t count) |
204 | { |
205 | struct i2c_client *client = to_i2c_client(dev); |
206 | struct max6639_data *data = i2c_get_clientdata(client); |
207 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
208 | unsigned long val; |
209 | int res; |
210 | |
211 | res = strict_strtoul(buf, 10, &val); |
212 | if (res) |
213 | return res; |
214 | |
215 | mutex_lock(&data->update_lock); |
216 | data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val); |
217 | i2c_smbus_write_byte_data(client, |
218 | MAX6639_REG_THERM_LIMIT(attr->index), |
219 | data->temp_therm[attr->index]); |
220 | mutex_unlock(&data->update_lock); |
221 | return count; |
222 | } |
223 | |
224 | static ssize_t show_temp_crit(struct device *dev, |
225 | struct device_attribute *dev_attr, char *buf) |
226 | { |
227 | struct i2c_client *client = to_i2c_client(dev); |
228 | struct max6639_data *data = i2c_get_clientdata(client); |
229 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
230 | |
231 | return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000)); |
232 | } |
233 | |
234 | static ssize_t set_temp_crit(struct device *dev, |
235 | struct device_attribute *dev_attr, |
236 | const char *buf, size_t count) |
237 | { |
238 | struct i2c_client *client = to_i2c_client(dev); |
239 | struct max6639_data *data = i2c_get_clientdata(client); |
240 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
241 | unsigned long val; |
242 | int res; |
243 | |
244 | res = strict_strtoul(buf, 10, &val); |
245 | if (res) |
246 | return res; |
247 | |
248 | mutex_lock(&data->update_lock); |
249 | data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val); |
250 | i2c_smbus_write_byte_data(client, |
251 | MAX6639_REG_ALERT_LIMIT(attr->index), |
252 | data->temp_alert[attr->index]); |
253 | mutex_unlock(&data->update_lock); |
254 | return count; |
255 | } |
256 | |
257 | static ssize_t show_temp_emergency(struct device *dev, |
258 | struct device_attribute *dev_attr, |
259 | char *buf) |
260 | { |
261 | struct i2c_client *client = to_i2c_client(dev); |
262 | struct max6639_data *data = i2c_get_clientdata(client); |
263 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
264 | |
265 | return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000)); |
266 | } |
267 | |
268 | static ssize_t set_temp_emergency(struct device *dev, |
269 | struct device_attribute *dev_attr, |
270 | const char *buf, size_t count) |
271 | { |
272 | struct i2c_client *client = to_i2c_client(dev); |
273 | struct max6639_data *data = i2c_get_clientdata(client); |
274 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
275 | unsigned long val; |
276 | int res; |
277 | |
278 | res = strict_strtoul(buf, 10, &val); |
279 | if (res) |
280 | return res; |
281 | |
282 | mutex_lock(&data->update_lock); |
283 | data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val); |
284 | i2c_smbus_write_byte_data(client, |
285 | MAX6639_REG_OT_LIMIT(attr->index), |
286 | data->temp_ot[attr->index]); |
287 | mutex_unlock(&data->update_lock); |
288 | return count; |
289 | } |
290 | |
291 | static ssize_t show_pwm(struct device *dev, |
292 | struct device_attribute *dev_attr, char *buf) |
293 | { |
294 | struct i2c_client *client = to_i2c_client(dev); |
295 | struct max6639_data *data = i2c_get_clientdata(client); |
296 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
297 | |
298 | return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120); |
299 | } |
300 | |
301 | static ssize_t set_pwm(struct device *dev, |
302 | struct device_attribute *dev_attr, |
303 | const char *buf, size_t count) |
304 | { |
305 | struct i2c_client *client = to_i2c_client(dev); |
306 | struct max6639_data *data = i2c_get_clientdata(client); |
307 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
308 | unsigned long val; |
309 | int res; |
310 | |
311 | res = strict_strtoul(buf, 10, &val); |
312 | if (res) |
313 | return res; |
314 | |
315 | val = SENSORS_LIMIT(val, 0, 255); |
316 | |
317 | mutex_lock(&data->update_lock); |
318 | data->pwm[attr->index] = (u8)(val * 120 / 255); |
319 | i2c_smbus_write_byte_data(client, |
320 | MAX6639_REG_TARGTDUTY(attr->index), |
321 | data->pwm[attr->index]); |
322 | mutex_unlock(&data->update_lock); |
323 | return count; |
324 | } |
325 | |
326 | static ssize_t show_fan_input(struct device *dev, |
327 | struct device_attribute *dev_attr, char *buf) |
328 | { |
329 | struct max6639_data *data = max6639_update_device(dev); |
330 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
331 | |
332 | if (IS_ERR(data)) |
333 | return PTR_ERR(data); |
334 | |
335 | return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], |
336 | data->ppr, data->rpm_range)); |
337 | } |
338 | |
339 | static ssize_t show_alarm(struct device *dev, |
340 | struct device_attribute *dev_attr, char *buf) |
341 | { |
342 | struct max6639_data *data = max6639_update_device(dev); |
343 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
344 | |
345 | if (IS_ERR(data)) |
346 | return PTR_ERR(data); |
347 | |
348 | return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index))); |
349 | } |
350 | |
351 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0); |
352 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1); |
353 | static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0); |
354 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1); |
355 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, |
356 | set_temp_max, 0); |
357 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max, |
358 | set_temp_max, 1); |
359 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit, |
360 | set_temp_crit, 0); |
361 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit, |
362 | set_temp_crit, 1); |
363 | static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO, |
364 | show_temp_emergency, set_temp_emergency, 0); |
365 | static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO, |
366 | show_temp_emergency, set_temp_emergency, 1); |
367 | static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0); |
368 | static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1); |
369 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0); |
370 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1); |
371 | static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_alarm, NULL, 1); |
372 | static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_alarm, NULL, 0); |
373 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 3); |
374 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 2); |
375 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 7); |
376 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 6); |
377 | static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 5); |
378 | static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 4); |
379 | |
380 | |
381 | static struct attribute *max6639_attributes[] = { |
382 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
383 | &sensor_dev_attr_temp2_input.dev_attr.attr, |
384 | &sensor_dev_attr_temp1_fault.dev_attr.attr, |
385 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
386 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
387 | &sensor_dev_attr_temp2_max.dev_attr.attr, |
388 | &sensor_dev_attr_temp1_crit.dev_attr.attr, |
389 | &sensor_dev_attr_temp2_crit.dev_attr.attr, |
390 | &sensor_dev_attr_temp1_emergency.dev_attr.attr, |
391 | &sensor_dev_attr_temp2_emergency.dev_attr.attr, |
392 | &sensor_dev_attr_pwm1.dev_attr.attr, |
393 | &sensor_dev_attr_pwm2.dev_attr.attr, |
394 | &sensor_dev_attr_fan1_input.dev_attr.attr, |
395 | &sensor_dev_attr_fan2_input.dev_attr.attr, |
396 | &sensor_dev_attr_fan1_fault.dev_attr.attr, |
397 | &sensor_dev_attr_fan2_fault.dev_attr.attr, |
398 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
399 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
400 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, |
401 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, |
402 | &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, |
403 | &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr, |
404 | NULL |
405 | }; |
406 | |
407 | static const struct attribute_group max6639_group = { |
408 | .attrs = max6639_attributes, |
409 | }; |
410 | |
411 | /* |
412 | * returns respective index in rpm_ranges table |
413 | * 1 by default on invalid range |
414 | */ |
415 | static int rpm_range_to_reg(int range) |
416 | { |
417 | int i; |
418 | |
419 | for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) { |
420 | if (rpm_ranges[i] == range) |
421 | return i; |
422 | } |
423 | |
424 | return 1; /* default: 4000 RPM */ |
425 | } |
426 | |
427 | static int max6639_init_client(struct i2c_client *client) |
428 | { |
429 | struct max6639_data *data = i2c_get_clientdata(client); |
430 | struct max6639_platform_data *max6639_info = |
431 | client->dev.platform_data; |
432 | int i = 0; |
433 | int rpm_range = 1; /* default: 4000 RPM */ |
434 | int err = 0; |
435 | |
177f3b92 |
436 | /* Reset chip to default values, see below for GCONFIG setup */ |
a5b79d62 |
437 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, |
438 | MAX6639_GCONFIG_POR); |
439 | if (err) |
440 | goto exit; |
441 | |
442 | /* Fans pulse per revolution is 2 by default */ |
443 | if (max6639_info && max6639_info->ppr > 0 && |
444 | max6639_info->ppr < 5) |
445 | data->ppr = max6639_info->ppr; |
446 | else |
447 | data->ppr = 2; |
448 | data->ppr -= 1; |
449 | err = i2c_smbus_write_byte_data(client, |
450 | MAX6639_REG_FAN_PPR(i), |
451 | data->ppr << 5); |
452 | if (err) |
453 | goto exit; |
454 | |
455 | if (max6639_info) |
456 | rpm_range = rpm_range_to_reg(max6639_info->rpm_range); |
457 | data->rpm_range = rpm_range; |
458 | |
459 | for (i = 0; i < 2; i++) { |
460 | |
461 | /* Fans config PWM, RPM */ |
462 | err = i2c_smbus_write_byte_data(client, |
463 | MAX6639_REG_FAN_CONFIG1(i), |
464 | MAX6639_FAN_CONFIG1_PWM | rpm_range); |
465 | if (err) |
466 | goto exit; |
467 | |
468 | /* Fans PWM polarity high by default */ |
469 | if (max6639_info && max6639_info->pwm_polarity == 0) |
470 | err = i2c_smbus_write_byte_data(client, |
471 | MAX6639_REG_FAN_CONFIG2a(i), 0x00); |
472 | else |
473 | err = i2c_smbus_write_byte_data(client, |
474 | MAX6639_REG_FAN_CONFIG2a(i), 0x02); |
475 | if (err) |
476 | goto exit; |
477 | |
177f3b92 |
478 | /* |
479 | * /THERM full speed enable, |
480 | * PWM frequency 25kHz, see also GCONFIG below |
481 | */ |
482 | err = i2c_smbus_write_byte_data(client, |
483 | MAX6639_REG_FAN_CONFIG3(i), |
484 | MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03); |
485 | if (err) |
486 | goto exit; |
487 | |
a5b79d62 |
488 | /* Max. temp. 80C/90C/100C */ |
489 | data->temp_therm[i] = 80; |
490 | data->temp_alert[i] = 90; |
491 | data->temp_ot[i] = 100; |
492 | err = i2c_smbus_write_byte_data(client, |
493 | MAX6639_REG_THERM_LIMIT(i), |
494 | data->temp_therm[i]); |
495 | if (err) |
496 | goto exit; |
497 | err = i2c_smbus_write_byte_data(client, |
498 | MAX6639_REG_ALERT_LIMIT(i), |
499 | data->temp_alert[i]); |
500 | if (err) |
501 | goto exit; |
502 | err = i2c_smbus_write_byte_data(client, |
503 | MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]); |
504 | if (err) |
505 | goto exit; |
506 | |
507 | /* PWM 120/120 (i.e. 100%) */ |
508 | data->pwm[i] = 120; |
509 | err = i2c_smbus_write_byte_data(client, |
510 | MAX6639_REG_TARGTDUTY(i), data->pwm[i]); |
511 | if (err) |
512 | goto exit; |
513 | } |
514 | /* Start monitoring */ |
515 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, |
177f3b92 |
516 | MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL | |
517 | MAX6639_GCONFIG_PWM_FREQ_HI); |
a5b79d62 |
518 | exit: |
519 | return err; |
520 | } |
521 | |
522 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
523 | static int max6639_detect(struct i2c_client *client, |
524 | struct i2c_board_info *info) |
525 | { |
526 | struct i2c_adapter *adapter = client->adapter; |
527 | int dev_id, manu_id; |
528 | |
529 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
530 | return -ENODEV; |
531 | |
532 | /* Actual detection via device and manufacturer ID */ |
533 | dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID); |
534 | manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID); |
535 | if (dev_id != 0x58 || manu_id != 0x4D) |
536 | return -ENODEV; |
537 | |
538 | strlcpy(info->type, "max6639", I2C_NAME_SIZE); |
539 | |
540 | return 0; |
541 | } |
542 | |
543 | static int max6639_probe(struct i2c_client *client, |
544 | const struct i2c_device_id *id) |
545 | { |
546 | struct max6639_data *data; |
547 | int err; |
548 | |
549 | data = kzalloc(sizeof(struct max6639_data), GFP_KERNEL); |
550 | if (!data) { |
551 | err = -ENOMEM; |
552 | goto exit; |
553 | } |
554 | |
555 | i2c_set_clientdata(client, data); |
556 | mutex_init(&data->update_lock); |
557 | |
558 | /* Initialize the max6639 chip */ |
559 | err = max6639_init_client(client); |
560 | if (err < 0) |
561 | goto error_free; |
562 | |
563 | /* Register sysfs hooks */ |
564 | err = sysfs_create_group(&client->dev.kobj, &max6639_group); |
565 | if (err) |
566 | goto error_free; |
567 | |
568 | data->hwmon_dev = hwmon_device_register(&client->dev); |
569 | if (IS_ERR(data->hwmon_dev)) { |
570 | err = PTR_ERR(data->hwmon_dev); |
571 | goto error_remove; |
572 | } |
573 | |
574 | dev_info(&client->dev, "temperature sensor and fan control found\n"); |
575 | |
576 | return 0; |
577 | |
578 | error_remove: |
579 | sysfs_remove_group(&client->dev.kobj, &max6639_group); |
580 | error_free: |
581 | kfree(data); |
582 | exit: |
583 | return err; |
584 | } |
585 | |
586 | static int max6639_remove(struct i2c_client *client) |
587 | { |
588 | struct max6639_data *data = i2c_get_clientdata(client); |
589 | |
590 | hwmon_device_unregister(data->hwmon_dev); |
591 | sysfs_remove_group(&client->dev.kobj, &max6639_group); |
592 | |
593 | kfree(data); |
594 | return 0; |
595 | } |
596 | |
597 | static int max6639_suspend(struct i2c_client *client, pm_message_t mesg) |
598 | { |
599 | int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); |
600 | if (data < 0) |
601 | return data; |
602 | |
603 | return i2c_smbus_write_byte_data(client, |
604 | MAX6639_REG_GCONFIG, data | MAX6639_GCONFIG_STANDBY); |
605 | } |
606 | |
607 | static int max6639_resume(struct i2c_client *client) |
608 | { |
609 | int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); |
610 | if (data < 0) |
611 | return data; |
612 | |
613 | return i2c_smbus_write_byte_data(client, |
614 | MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY); |
615 | } |
616 | |
617 | static const struct i2c_device_id max6639_id[] = { |
618 | {"max6639", 0}, |
619 | { } |
620 | }; |
621 | |
622 | MODULE_DEVICE_TABLE(i2c, max6639_id); |
623 | |
624 | static struct i2c_driver max6639_driver = { |
625 | .class = I2C_CLASS_HWMON, |
626 | .driver = { |
627 | .name = "max6639", |
628 | }, |
629 | .probe = max6639_probe, |
630 | .remove = max6639_remove, |
631 | .suspend = max6639_suspend, |
632 | .resume = max6639_resume, |
633 | .id_table = max6639_id, |
634 | .detect = max6639_detect, |
635 | .address_list = normal_i2c, |
636 | }; |
637 | |
638 | static int __init max6639_init(void) |
639 | { |
640 | return i2c_add_driver(&max6639_driver); |
641 | } |
642 | |
643 | static void __exit max6639_exit(void) |
644 | { |
645 | i2c_del_driver(&max6639_driver); |
646 | } |
647 | |
648 | MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); |
649 | MODULE_DESCRIPTION("max6639 driver"); |
650 | MODULE_LICENSE("GPL"); |
651 | |
652 | module_init(max6639_init); |
653 | module_exit(max6639_exit); |