Commit | Line | Data |
---|---|---|
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 */ | |
7edc8cc1 | 38 | static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END }; |
a5b79d62 | 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 | ||
b63d97a3 CS |
75 | #define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \ |
76 | 0 : (rpm_ranges[rpm_range] * 30) / (val)) | |
2a844c14 | 77 | #define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255) |
a5b79d62 | 78 | |
79 | /* | |
80 | * Client data (each client gets its own) | |
81 | */ | |
82 | struct max6639_data { | |
7981c584 | 83 | struct i2c_client *client; |
a5b79d62 | 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 | { | |
7981c584 GR |
107 | struct max6639_data *data = dev_get_drvdata(dev); |
108 | struct i2c_client *client = data->client; | |
a5b79d62 | 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 | { | |
a5b79d62 | 194 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 195 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 196 | |
197 | return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000)); | |
198 | } | |
199 | ||
200 | static ssize_t set_temp_max(struct device *dev, | |
201 | struct device_attribute *dev_attr, | |
202 | const char *buf, size_t count) | |
203 | { | |
a5b79d62 | 204 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
205 | struct max6639_data *data = dev_get_drvdata(dev); |
206 | struct i2c_client *client = data->client; | |
a5b79d62 | 207 | unsigned long val; |
208 | int res; | |
209 | ||
179c4fdb | 210 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 211 | if (res) |
212 | return res; | |
213 | ||
214 | mutex_lock(&data->update_lock); | |
215 | data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val); | |
216 | i2c_smbus_write_byte_data(client, | |
217 | MAX6639_REG_THERM_LIMIT(attr->index), | |
218 | data->temp_therm[attr->index]); | |
219 | mutex_unlock(&data->update_lock); | |
220 | return count; | |
221 | } | |
222 | ||
223 | static ssize_t show_temp_crit(struct device *dev, | |
224 | struct device_attribute *dev_attr, char *buf) | |
225 | { | |
a5b79d62 | 226 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 227 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 228 | |
229 | return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000)); | |
230 | } | |
231 | ||
232 | static ssize_t set_temp_crit(struct device *dev, | |
233 | struct device_attribute *dev_attr, | |
234 | const char *buf, size_t count) | |
235 | { | |
a5b79d62 | 236 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
237 | struct max6639_data *data = dev_get_drvdata(dev); |
238 | struct i2c_client *client = data->client; | |
a5b79d62 | 239 | unsigned long val; |
240 | int res; | |
241 | ||
179c4fdb | 242 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 243 | if (res) |
244 | return res; | |
245 | ||
246 | mutex_lock(&data->update_lock); | |
247 | data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val); | |
248 | i2c_smbus_write_byte_data(client, | |
249 | MAX6639_REG_ALERT_LIMIT(attr->index), | |
250 | data->temp_alert[attr->index]); | |
251 | mutex_unlock(&data->update_lock); | |
252 | return count; | |
253 | } | |
254 | ||
255 | static ssize_t show_temp_emergency(struct device *dev, | |
256 | struct device_attribute *dev_attr, | |
257 | char *buf) | |
258 | { | |
a5b79d62 | 259 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 260 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 261 | |
262 | return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000)); | |
263 | } | |
264 | ||
265 | static ssize_t set_temp_emergency(struct device *dev, | |
266 | struct device_attribute *dev_attr, | |
267 | const char *buf, size_t count) | |
268 | { | |
a5b79d62 | 269 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
270 | struct max6639_data *data = dev_get_drvdata(dev); |
271 | struct i2c_client *client = data->client; | |
a5b79d62 | 272 | unsigned long val; |
273 | int res; | |
274 | ||
179c4fdb | 275 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 276 | if (res) |
277 | return res; | |
278 | ||
279 | mutex_lock(&data->update_lock); | |
280 | data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val); | |
281 | i2c_smbus_write_byte_data(client, | |
282 | MAX6639_REG_OT_LIMIT(attr->index), | |
283 | data->temp_ot[attr->index]); | |
284 | mutex_unlock(&data->update_lock); | |
285 | return count; | |
286 | } | |
287 | ||
288 | static ssize_t show_pwm(struct device *dev, | |
289 | struct device_attribute *dev_attr, char *buf) | |
290 | { | |
a5b79d62 | 291 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 292 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 293 | |
294 | return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120); | |
295 | } | |
296 | ||
297 | static ssize_t set_pwm(struct device *dev, | |
298 | struct device_attribute *dev_attr, | |
299 | const char *buf, size_t count) | |
300 | { | |
a5b79d62 | 301 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
302 | struct max6639_data *data = dev_get_drvdata(dev); |
303 | struct i2c_client *client = data->client; | |
a5b79d62 | 304 | unsigned long val; |
305 | int res; | |
306 | ||
179c4fdb | 307 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 308 | if (res) |
309 | return res; | |
310 | ||
2a844c14 | 311 | val = clamp_val(val, 0, 255); |
a5b79d62 | 312 | |
313 | mutex_lock(&data->update_lock); | |
314 | data->pwm[attr->index] = (u8)(val * 120 / 255); | |
315 | i2c_smbus_write_byte_data(client, | |
316 | MAX6639_REG_TARGTDUTY(attr->index), | |
317 | data->pwm[attr->index]); | |
318 | mutex_unlock(&data->update_lock); | |
319 | return count; | |
320 | } | |
321 | ||
322 | static ssize_t show_fan_input(struct device *dev, | |
323 | struct device_attribute *dev_attr, char *buf) | |
324 | { | |
325 | struct max6639_data *data = max6639_update_device(dev); | |
326 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
327 | ||
328 | if (IS_ERR(data)) | |
329 | return PTR_ERR(data); | |
330 | ||
331 | return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], | |
b63d97a3 | 332 | data->rpm_range)); |
a5b79d62 | 333 | } |
334 | ||
335 | static ssize_t show_alarm(struct device *dev, | |
336 | struct device_attribute *dev_attr, char *buf) | |
337 | { | |
338 | struct max6639_data *data = max6639_update_device(dev); | |
339 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
340 | ||
341 | if (IS_ERR(data)) | |
342 | return PTR_ERR(data); | |
343 | ||
344 | return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index))); | |
345 | } | |
346 | ||
347 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0); | |
348 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1); | |
349 | static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0); | |
350 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1); | |
351 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, | |
352 | set_temp_max, 0); | |
353 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max, | |
354 | set_temp_max, 1); | |
355 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit, | |
356 | set_temp_crit, 0); | |
357 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit, | |
358 | set_temp_crit, 1); | |
359 | static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO, | |
360 | show_temp_emergency, set_temp_emergency, 0); | |
361 | static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO, | |
362 | show_temp_emergency, set_temp_emergency, 1); | |
363 | static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0); | |
364 | static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1); | |
365 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0); | |
366 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1); | |
367 | static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_alarm, NULL, 1); | |
368 | static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_alarm, NULL, 0); | |
369 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 3); | |
370 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 2); | |
371 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 7); | |
372 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 6); | |
373 | static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 5); | |
374 | static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 4); | |
375 | ||
376 | ||
7981c584 | 377 | static struct attribute *max6639_attrs[] = { |
a5b79d62 | 378 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
379 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
380 | &sensor_dev_attr_temp1_fault.dev_attr.attr, | |
381 | &sensor_dev_attr_temp2_fault.dev_attr.attr, | |
382 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
383 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
384 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
385 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
386 | &sensor_dev_attr_temp1_emergency.dev_attr.attr, | |
387 | &sensor_dev_attr_temp2_emergency.dev_attr.attr, | |
388 | &sensor_dev_attr_pwm1.dev_attr.attr, | |
389 | &sensor_dev_attr_pwm2.dev_attr.attr, | |
390 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
391 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
392 | &sensor_dev_attr_fan1_fault.dev_attr.attr, | |
393 | &sensor_dev_attr_fan2_fault.dev_attr.attr, | |
394 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
395 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
396 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
397 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
398 | &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, | |
399 | &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr, | |
400 | NULL | |
401 | }; | |
7981c584 | 402 | ATTRIBUTE_GROUPS(max6639); |
a5b79d62 | 403 | |
404 | /* | |
405 | * returns respective index in rpm_ranges table | |
406 | * 1 by default on invalid range | |
407 | */ | |
408 | static int rpm_range_to_reg(int range) | |
409 | { | |
410 | int i; | |
411 | ||
412 | for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) { | |
413 | if (rpm_ranges[i] == range) | |
414 | return i; | |
415 | } | |
416 | ||
417 | return 1; /* default: 4000 RPM */ | |
418 | } | |
419 | ||
7981c584 GR |
420 | static int max6639_init_client(struct i2c_client *client, |
421 | struct max6639_data *data) | |
a5b79d62 | 422 | { |
a5b79d62 | 423 | struct max6639_platform_data *max6639_info = |
a8b3a3a5 | 424 | dev_get_platdata(&client->dev); |
2f2da1ac | 425 | int i; |
a5b79d62 | 426 | int rpm_range = 1; /* default: 4000 RPM */ |
2f2da1ac | 427 | int err; |
a5b79d62 | 428 | |
177f3b92 | 429 | /* Reset chip to default values, see below for GCONFIG setup */ |
a5b79d62 | 430 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, |
431 | MAX6639_GCONFIG_POR); | |
432 | if (err) | |
433 | goto exit; | |
434 | ||
435 | /* Fans pulse per revolution is 2 by default */ | |
436 | if (max6639_info && max6639_info->ppr > 0 && | |
437 | max6639_info->ppr < 5) | |
438 | data->ppr = max6639_info->ppr; | |
439 | else | |
440 | data->ppr = 2; | |
441 | data->ppr -= 1; | |
a5b79d62 | 442 | |
443 | if (max6639_info) | |
444 | rpm_range = rpm_range_to_reg(max6639_info->rpm_range); | |
445 | data->rpm_range = rpm_range; | |
446 | ||
447 | for (i = 0; i < 2; i++) { | |
448 | ||
2f2da1ac CS |
449 | /* Set Fan pulse per revolution */ |
450 | err = i2c_smbus_write_byte_data(client, | |
451 | MAX6639_REG_FAN_PPR(i), | |
452 | data->ppr << 6); | |
453 | if (err) | |
454 | goto exit; | |
455 | ||
a5b79d62 | 456 | /* Fans config PWM, RPM */ |
457 | err = i2c_smbus_write_byte_data(client, | |
458 | MAX6639_REG_FAN_CONFIG1(i), | |
459 | MAX6639_FAN_CONFIG1_PWM | rpm_range); | |
460 | if (err) | |
461 | goto exit; | |
462 | ||
463 | /* Fans PWM polarity high by default */ | |
464 | if (max6639_info && max6639_info->pwm_polarity == 0) | |
465 | err = i2c_smbus_write_byte_data(client, | |
466 | MAX6639_REG_FAN_CONFIG2a(i), 0x00); | |
467 | else | |
468 | err = i2c_smbus_write_byte_data(client, | |
469 | MAX6639_REG_FAN_CONFIG2a(i), 0x02); | |
470 | if (err) | |
471 | goto exit; | |
472 | ||
177f3b92 | 473 | /* |
474 | * /THERM full speed enable, | |
475 | * PWM frequency 25kHz, see also GCONFIG below | |
476 | */ | |
477 | err = i2c_smbus_write_byte_data(client, | |
478 | MAX6639_REG_FAN_CONFIG3(i), | |
479 | MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03); | |
480 | if (err) | |
481 | goto exit; | |
482 | ||
a5b79d62 | 483 | /* Max. temp. 80C/90C/100C */ |
484 | data->temp_therm[i] = 80; | |
485 | data->temp_alert[i] = 90; | |
486 | data->temp_ot[i] = 100; | |
487 | err = i2c_smbus_write_byte_data(client, | |
488 | MAX6639_REG_THERM_LIMIT(i), | |
489 | data->temp_therm[i]); | |
490 | if (err) | |
491 | goto exit; | |
492 | err = i2c_smbus_write_byte_data(client, | |
493 | MAX6639_REG_ALERT_LIMIT(i), | |
494 | data->temp_alert[i]); | |
495 | if (err) | |
496 | goto exit; | |
497 | err = i2c_smbus_write_byte_data(client, | |
498 | MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]); | |
499 | if (err) | |
500 | goto exit; | |
501 | ||
502 | /* PWM 120/120 (i.e. 100%) */ | |
503 | data->pwm[i] = 120; | |
504 | err = i2c_smbus_write_byte_data(client, | |
505 | MAX6639_REG_TARGTDUTY(i), data->pwm[i]); | |
506 | if (err) | |
507 | goto exit; | |
508 | } | |
509 | /* Start monitoring */ | |
510 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, | |
177f3b92 | 511 | MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL | |
512 | MAX6639_GCONFIG_PWM_FREQ_HI); | |
a5b79d62 | 513 | exit: |
514 | return err; | |
515 | } | |
516 | ||
517 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
518 | static int max6639_detect(struct i2c_client *client, | |
519 | struct i2c_board_info *info) | |
520 | { | |
521 | struct i2c_adapter *adapter = client->adapter; | |
522 | int dev_id, manu_id; | |
523 | ||
524 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
525 | return -ENODEV; | |
526 | ||
527 | /* Actual detection via device and manufacturer ID */ | |
528 | dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID); | |
529 | manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID); | |
530 | if (dev_id != 0x58 || manu_id != 0x4D) | |
531 | return -ENODEV; | |
532 | ||
533 | strlcpy(info->type, "max6639", I2C_NAME_SIZE); | |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
538 | static int max6639_probe(struct i2c_client *client, | |
539 | const struct i2c_device_id *id) | |
540 | { | |
c1ea0a04 | 541 | struct device *dev = &client->dev; |
a5b79d62 | 542 | struct max6639_data *data; |
7981c584 | 543 | struct device *hwmon_dev; |
a5b79d62 | 544 | int err; |
545 | ||
c1ea0a04 | 546 | data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL); |
b07405fb GR |
547 | if (!data) |
548 | return -ENOMEM; | |
a5b79d62 | 549 | |
7981c584 | 550 | data->client = client; |
a5b79d62 | 551 | mutex_init(&data->update_lock); |
552 | ||
553 | /* Initialize the max6639 chip */ | |
7981c584 | 554 | err = max6639_init_client(client, data); |
a5b79d62 | 555 | if (err < 0) |
b07405fb | 556 | return err; |
a5b79d62 | 557 | |
7981c584 GR |
558 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
559 | data, | |
560 | max6639_groups); | |
561 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
a5b79d62 | 562 | } |
563 | ||
52f30f77 MB |
564 | #ifdef CONFIG_PM_SLEEP |
565 | static int max6639_suspend(struct device *dev) | |
a5b79d62 | 566 | { |
52f30f77 | 567 | struct i2c_client *client = to_i2c_client(dev); |
a5b79d62 | 568 | int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); |
569 | if (data < 0) | |
570 | return data; | |
571 | ||
572 | return i2c_smbus_write_byte_data(client, | |
573 | MAX6639_REG_GCONFIG, data | MAX6639_GCONFIG_STANDBY); | |
574 | } | |
575 | ||
52f30f77 | 576 | static int max6639_resume(struct device *dev) |
a5b79d62 | 577 | { |
52f30f77 | 578 | struct i2c_client *client = to_i2c_client(dev); |
a5b79d62 | 579 | int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); |
580 | if (data < 0) | |
581 | return data; | |
582 | ||
583 | return i2c_smbus_write_byte_data(client, | |
584 | MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY); | |
585 | } | |
52f30f77 | 586 | #endif /* CONFIG_PM_SLEEP */ |
a5b79d62 | 587 | |
588 | static const struct i2c_device_id max6639_id[] = { | |
589 | {"max6639", 0}, | |
590 | { } | |
591 | }; | |
592 | ||
593 | MODULE_DEVICE_TABLE(i2c, max6639_id); | |
594 | ||
768821a3 | 595 | static SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume); |
52f30f77 | 596 | |
a5b79d62 | 597 | static struct i2c_driver max6639_driver = { |
598 | .class = I2C_CLASS_HWMON, | |
599 | .driver = { | |
600 | .name = "max6639", | |
52f30f77 | 601 | .pm = &max6639_pm_ops, |
a5b79d62 | 602 | }, |
603 | .probe = max6639_probe, | |
a5b79d62 | 604 | .id_table = max6639_id, |
605 | .detect = max6639_detect, | |
606 | .address_list = normal_i2c, | |
607 | }; | |
608 | ||
f0967eea | 609 | module_i2c_driver(max6639_driver); |
a5b79d62 | 610 | |
611 | MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); | |
612 | MODULE_DESCRIPTION("max6639 driver"); | |
613 | MODULE_LICENSE("GPL"); |