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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
a5b79d62 | 2 | /* |
3 | * max6639.c - Support for Maxim MAX6639 | |
4 | * | |
5 | * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller | |
6 | * | |
7 | * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de> | |
8 | * | |
9 | * based on the initial MAX6639 support from semptian.net | |
10 | * by He Changqing <hechangqing@semptian.com> | |
a5b79d62 | 11 | */ |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/jiffies.h> | |
17 | #include <linux/i2c.h> | |
18 | #include <linux/hwmon.h> | |
19 | #include <linux/hwmon-sysfs.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/mutex.h> | |
0c9fe161 | 22 | #include <linux/platform_data/max6639.h> |
a5b79d62 | 23 | |
24 | /* Addresses to scan */ | |
7edc8cc1 | 25 | static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END }; |
a5b79d62 | 26 | |
27 | /* The MAX6639 registers, valid channel numbers: 0, 1 */ | |
28 | #define MAX6639_REG_TEMP(ch) (0x00 + (ch)) | |
29 | #define MAX6639_REG_STATUS 0x02 | |
30 | #define MAX6639_REG_OUTPUT_MASK 0x03 | |
31 | #define MAX6639_REG_GCONFIG 0x04 | |
32 | #define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch)) | |
33 | #define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch)) | |
34 | #define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch)) | |
35 | #define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch)) | |
36 | #define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4) | |
37 | #define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4) | |
38 | #define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4) | |
39 | #define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4) | |
40 | #define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch)) | |
41 | #define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch)) | |
42 | #define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch)) | |
43 | #define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch)) | |
44 | #define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch)) | |
45 | #define MAX6639_REG_DEVID 0x3D | |
46 | #define MAX6639_REG_MANUID 0x3E | |
47 | #define MAX6639_REG_DEVREV 0x3F | |
48 | ||
49 | /* Register bits */ | |
50 | #define MAX6639_GCONFIG_STANDBY 0x80 | |
51 | #define MAX6639_GCONFIG_POR 0x40 | |
52 | #define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20 | |
53 | #define MAX6639_GCONFIG_CH2_LOCAL 0x10 | |
177f3b92 | 54 | #define MAX6639_GCONFIG_PWM_FREQ_HI 0x08 |
a5b79d62 | 55 | |
56 | #define MAX6639_FAN_CONFIG1_PWM 0x80 | |
57 | ||
177f3b92 | 58 | #define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40 |
59 | ||
a5b79d62 | 60 | static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 }; |
61 | ||
b63d97a3 CS |
62 | #define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \ |
63 | 0 : (rpm_ranges[rpm_range] * 30) / (val)) | |
2a844c14 | 64 | #define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255) |
a5b79d62 | 65 | |
66 | /* | |
67 | * Client data (each client gets its own) | |
68 | */ | |
69 | struct max6639_data { | |
7981c584 | 70 | struct i2c_client *client; |
a5b79d62 | 71 | struct mutex update_lock; |
952a11ca | 72 | bool valid; /* true if following fields are valid */ |
a5b79d62 | 73 | unsigned long last_updated; /* In jiffies */ |
74 | ||
75 | /* Register values sampled regularly */ | |
76 | u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */ | |
77 | bool temp_fault[2]; /* Detected temperature diode failure */ | |
78 | u8 fan[2]; /* Register value: TACH count for fans >=30 */ | |
79 | u8 status; /* Detected channel alarms and fan failures */ | |
80 | ||
81 | /* Register values only written to */ | |
82 | u8 pwm[2]; /* Register value: Duty cycle 0..120 */ | |
83 | u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */ | |
84 | u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */ | |
85 | u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */ | |
86 | ||
87 | /* Register values initialized only once */ | |
88 | u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */ | |
89 | u8 rpm_range; /* Index in above rpm_ranges table */ | |
4e2271ea MSB |
90 | |
91 | /* Optional regulator for FAN supply */ | |
92 | struct regulator *reg; | |
a5b79d62 | 93 | }; |
94 | ||
95 | static struct max6639_data *max6639_update_device(struct device *dev) | |
96 | { | |
7981c584 GR |
97 | struct max6639_data *data = dev_get_drvdata(dev); |
98 | struct i2c_client *client = data->client; | |
a5b79d62 | 99 | struct max6639_data *ret = data; |
100 | int i; | |
101 | int status_reg; | |
102 | ||
103 | mutex_lock(&data->update_lock); | |
104 | ||
105 | if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { | |
106 | int res; | |
107 | ||
108 | dev_dbg(&client->dev, "Starting max6639 update\n"); | |
109 | ||
110 | status_reg = i2c_smbus_read_byte_data(client, | |
111 | MAX6639_REG_STATUS); | |
112 | if (status_reg < 0) { | |
113 | ret = ERR_PTR(status_reg); | |
114 | goto abort; | |
115 | } | |
116 | ||
117 | data->status = status_reg; | |
118 | ||
119 | for (i = 0; i < 2; i++) { | |
120 | res = i2c_smbus_read_byte_data(client, | |
121 | MAX6639_REG_FAN_CNT(i)); | |
122 | if (res < 0) { | |
123 | ret = ERR_PTR(res); | |
124 | goto abort; | |
125 | } | |
126 | data->fan[i] = res; | |
127 | ||
128 | res = i2c_smbus_read_byte_data(client, | |
129 | MAX6639_REG_TEMP_EXT(i)); | |
130 | if (res < 0) { | |
131 | ret = ERR_PTR(res); | |
132 | goto abort; | |
133 | } | |
134 | data->temp[i] = res >> 5; | |
135 | data->temp_fault[i] = res & 0x01; | |
136 | ||
137 | res = i2c_smbus_read_byte_data(client, | |
138 | MAX6639_REG_TEMP(i)); | |
139 | if (res < 0) { | |
140 | ret = ERR_PTR(res); | |
141 | goto abort; | |
142 | } | |
143 | data->temp[i] |= res << 3; | |
144 | } | |
145 | ||
146 | data->last_updated = jiffies; | |
952a11ca | 147 | data->valid = true; |
a5b79d62 | 148 | } |
149 | abort: | |
150 | mutex_unlock(&data->update_lock); | |
151 | ||
152 | return ret; | |
153 | } | |
154 | ||
0a0ab22a | 155 | static ssize_t temp_input_show(struct device *dev, |
a5b79d62 | 156 | struct device_attribute *dev_attr, char *buf) |
157 | { | |
158 | long temp; | |
159 | struct max6639_data *data = max6639_update_device(dev); | |
160 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
161 | ||
162 | if (IS_ERR(data)) | |
163 | return PTR_ERR(data); | |
164 | ||
165 | temp = data->temp[attr->index] * 125; | |
166 | return sprintf(buf, "%ld\n", temp); | |
167 | } | |
168 | ||
0a0ab22a | 169 | static ssize_t temp_fault_show(struct device *dev, |
a5b79d62 | 170 | struct device_attribute *dev_attr, char *buf) |
171 | { | |
172 | struct max6639_data *data = max6639_update_device(dev); | |
173 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
174 | ||
175 | if (IS_ERR(data)) | |
176 | return PTR_ERR(data); | |
177 | ||
178 | return sprintf(buf, "%d\n", data->temp_fault[attr->index]); | |
179 | } | |
180 | ||
0a0ab22a | 181 | static ssize_t temp_max_show(struct device *dev, |
a5b79d62 | 182 | struct device_attribute *dev_attr, char *buf) |
183 | { | |
a5b79d62 | 184 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 185 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 186 | |
187 | return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000)); | |
188 | } | |
189 | ||
0a0ab22a GR |
190 | static ssize_t temp_max_store(struct device *dev, |
191 | struct device_attribute *dev_attr, | |
192 | const char *buf, size_t count) | |
a5b79d62 | 193 | { |
a5b79d62 | 194 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
195 | struct max6639_data *data = dev_get_drvdata(dev); |
196 | struct i2c_client *client = data->client; | |
a5b79d62 | 197 | unsigned long val; |
198 | int res; | |
199 | ||
179c4fdb | 200 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 201 | if (res) |
202 | return res; | |
203 | ||
204 | mutex_lock(&data->update_lock); | |
205 | data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val); | |
206 | i2c_smbus_write_byte_data(client, | |
207 | MAX6639_REG_THERM_LIMIT(attr->index), | |
208 | data->temp_therm[attr->index]); | |
209 | mutex_unlock(&data->update_lock); | |
210 | return count; | |
211 | } | |
212 | ||
0a0ab22a | 213 | static ssize_t temp_crit_show(struct device *dev, |
a5b79d62 | 214 | struct device_attribute *dev_attr, char *buf) |
215 | { | |
a5b79d62 | 216 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 217 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 218 | |
219 | return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000)); | |
220 | } | |
221 | ||
0a0ab22a GR |
222 | static ssize_t temp_crit_store(struct device *dev, |
223 | struct device_attribute *dev_attr, | |
224 | const char *buf, size_t count) | |
a5b79d62 | 225 | { |
a5b79d62 | 226 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
227 | struct max6639_data *data = dev_get_drvdata(dev); |
228 | struct i2c_client *client = data->client; | |
a5b79d62 | 229 | unsigned long val; |
230 | int res; | |
231 | ||
179c4fdb | 232 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 233 | if (res) |
234 | return res; | |
235 | ||
236 | mutex_lock(&data->update_lock); | |
237 | data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val); | |
238 | i2c_smbus_write_byte_data(client, | |
239 | MAX6639_REG_ALERT_LIMIT(attr->index), | |
240 | data->temp_alert[attr->index]); | |
241 | mutex_unlock(&data->update_lock); | |
242 | return count; | |
243 | } | |
244 | ||
0a0ab22a | 245 | static ssize_t temp_emergency_show(struct device *dev, |
a5b79d62 | 246 | struct device_attribute *dev_attr, |
247 | char *buf) | |
248 | { | |
a5b79d62 | 249 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 250 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 251 | |
252 | return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000)); | |
253 | } | |
254 | ||
0a0ab22a GR |
255 | static ssize_t temp_emergency_store(struct device *dev, |
256 | struct device_attribute *dev_attr, | |
257 | const char *buf, size_t count) | |
a5b79d62 | 258 | { |
a5b79d62 | 259 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
260 | struct max6639_data *data = dev_get_drvdata(dev); |
261 | struct i2c_client *client = data->client; | |
a5b79d62 | 262 | unsigned long val; |
263 | int res; | |
264 | ||
179c4fdb | 265 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 266 | if (res) |
267 | return res; | |
268 | ||
269 | mutex_lock(&data->update_lock); | |
270 | data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val); | |
271 | i2c_smbus_write_byte_data(client, | |
272 | MAX6639_REG_OT_LIMIT(attr->index), | |
273 | data->temp_ot[attr->index]); | |
274 | mutex_unlock(&data->update_lock); | |
275 | return count; | |
276 | } | |
277 | ||
0a0ab22a GR |
278 | static ssize_t pwm_show(struct device *dev, struct device_attribute *dev_attr, |
279 | char *buf) | |
a5b79d62 | 280 | { |
a5b79d62 | 281 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 282 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 283 | |
284 | return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120); | |
285 | } | |
286 | ||
0a0ab22a GR |
287 | static ssize_t pwm_store(struct device *dev, |
288 | struct device_attribute *dev_attr, const char *buf, | |
289 | size_t count) | |
a5b79d62 | 290 | { |
a5b79d62 | 291 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
292 | struct max6639_data *data = dev_get_drvdata(dev); |
293 | struct i2c_client *client = data->client; | |
a5b79d62 | 294 | unsigned long val; |
295 | int res; | |
296 | ||
179c4fdb | 297 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 298 | if (res) |
299 | return res; | |
300 | ||
2a844c14 | 301 | val = clamp_val(val, 0, 255); |
a5b79d62 | 302 | |
303 | mutex_lock(&data->update_lock); | |
304 | data->pwm[attr->index] = (u8)(val * 120 / 255); | |
305 | i2c_smbus_write_byte_data(client, | |
306 | MAX6639_REG_TARGTDUTY(attr->index), | |
307 | data->pwm[attr->index]); | |
308 | mutex_unlock(&data->update_lock); | |
309 | return count; | |
310 | } | |
311 | ||
0a0ab22a | 312 | static ssize_t fan_input_show(struct device *dev, |
a5b79d62 | 313 | struct device_attribute *dev_attr, char *buf) |
314 | { | |
315 | struct max6639_data *data = max6639_update_device(dev); | |
316 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
317 | ||
318 | if (IS_ERR(data)) | |
319 | return PTR_ERR(data); | |
320 | ||
321 | return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], | |
b63d97a3 | 322 | data->rpm_range)); |
a5b79d62 | 323 | } |
324 | ||
0a0ab22a | 325 | static ssize_t alarm_show(struct device *dev, |
a5b79d62 | 326 | struct device_attribute *dev_attr, char *buf) |
327 | { | |
328 | struct max6639_data *data = max6639_update_device(dev); | |
329 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
330 | ||
331 | if (IS_ERR(data)) | |
332 | return PTR_ERR(data); | |
333 | ||
334 | return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index))); | |
335 | } | |
336 | ||
0a0ab22a GR |
337 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0); |
338 | static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1); | |
339 | static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0); | |
340 | static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1); | |
341 | static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0); | |
342 | static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1); | |
343 | static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0); | |
344 | static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1); | |
345 | static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0); | |
346 | static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1); | |
347 | static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0); | |
348 | static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1); | |
349 | static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0); | |
350 | static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1); | |
351 | static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1); | |
352 | static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0); | |
353 | static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3); | |
354 | static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2); | |
355 | static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7); | |
356 | static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6); | |
357 | static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5); | |
358 | static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4); | |
a5b79d62 | 359 | |
360 | ||
7981c584 | 361 | static struct attribute *max6639_attrs[] = { |
a5b79d62 | 362 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
363 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
364 | &sensor_dev_attr_temp1_fault.dev_attr.attr, | |
365 | &sensor_dev_attr_temp2_fault.dev_attr.attr, | |
366 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
367 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
368 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
369 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
370 | &sensor_dev_attr_temp1_emergency.dev_attr.attr, | |
371 | &sensor_dev_attr_temp2_emergency.dev_attr.attr, | |
372 | &sensor_dev_attr_pwm1.dev_attr.attr, | |
373 | &sensor_dev_attr_pwm2.dev_attr.attr, | |
374 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
375 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
376 | &sensor_dev_attr_fan1_fault.dev_attr.attr, | |
377 | &sensor_dev_attr_fan2_fault.dev_attr.attr, | |
378 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
379 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
380 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
381 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
382 | &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, | |
383 | &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr, | |
384 | NULL | |
385 | }; | |
7981c584 | 386 | ATTRIBUTE_GROUPS(max6639); |
a5b79d62 | 387 | |
388 | /* | |
389 | * returns respective index in rpm_ranges table | |
390 | * 1 by default on invalid range | |
391 | */ | |
392 | static int rpm_range_to_reg(int range) | |
393 | { | |
394 | int i; | |
395 | ||
396 | for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) { | |
397 | if (rpm_ranges[i] == range) | |
398 | return i; | |
399 | } | |
400 | ||
401 | return 1; /* default: 4000 RPM */ | |
402 | } | |
403 | ||
7981c584 GR |
404 | static int max6639_init_client(struct i2c_client *client, |
405 | struct max6639_data *data) | |
a5b79d62 | 406 | { |
a5b79d62 | 407 | struct max6639_platform_data *max6639_info = |
a8b3a3a5 | 408 | dev_get_platdata(&client->dev); |
2f2da1ac | 409 | int i; |
a5b79d62 | 410 | int rpm_range = 1; /* default: 4000 RPM */ |
2f2da1ac | 411 | int err; |
a5b79d62 | 412 | |
177f3b92 | 413 | /* Reset chip to default values, see below for GCONFIG setup */ |
a5b79d62 | 414 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, |
415 | MAX6639_GCONFIG_POR); | |
416 | if (err) | |
417 | goto exit; | |
418 | ||
419 | /* Fans pulse per revolution is 2 by default */ | |
420 | if (max6639_info && max6639_info->ppr > 0 && | |
421 | max6639_info->ppr < 5) | |
422 | data->ppr = max6639_info->ppr; | |
423 | else | |
424 | data->ppr = 2; | |
425 | data->ppr -= 1; | |
a5b79d62 | 426 | |
427 | if (max6639_info) | |
428 | rpm_range = rpm_range_to_reg(max6639_info->rpm_range); | |
429 | data->rpm_range = rpm_range; | |
430 | ||
431 | for (i = 0; i < 2; i++) { | |
432 | ||
2f2da1ac CS |
433 | /* Set Fan pulse per revolution */ |
434 | err = i2c_smbus_write_byte_data(client, | |
435 | MAX6639_REG_FAN_PPR(i), | |
436 | data->ppr << 6); | |
437 | if (err) | |
438 | goto exit; | |
439 | ||
a5b79d62 | 440 | /* Fans config PWM, RPM */ |
441 | err = i2c_smbus_write_byte_data(client, | |
442 | MAX6639_REG_FAN_CONFIG1(i), | |
443 | MAX6639_FAN_CONFIG1_PWM | rpm_range); | |
444 | if (err) | |
445 | goto exit; | |
446 | ||
447 | /* Fans PWM polarity high by default */ | |
448 | if (max6639_info && max6639_info->pwm_polarity == 0) | |
449 | err = i2c_smbus_write_byte_data(client, | |
450 | MAX6639_REG_FAN_CONFIG2a(i), 0x00); | |
451 | else | |
452 | err = i2c_smbus_write_byte_data(client, | |
453 | MAX6639_REG_FAN_CONFIG2a(i), 0x02); | |
454 | if (err) | |
455 | goto exit; | |
456 | ||
177f3b92 | 457 | /* |
458 | * /THERM full speed enable, | |
459 | * PWM frequency 25kHz, see also GCONFIG below | |
460 | */ | |
461 | err = i2c_smbus_write_byte_data(client, | |
462 | MAX6639_REG_FAN_CONFIG3(i), | |
463 | MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03); | |
464 | if (err) | |
465 | goto exit; | |
466 | ||
a5b79d62 | 467 | /* Max. temp. 80C/90C/100C */ |
468 | data->temp_therm[i] = 80; | |
469 | data->temp_alert[i] = 90; | |
470 | data->temp_ot[i] = 100; | |
471 | err = i2c_smbus_write_byte_data(client, | |
472 | MAX6639_REG_THERM_LIMIT(i), | |
473 | data->temp_therm[i]); | |
474 | if (err) | |
475 | goto exit; | |
476 | err = i2c_smbus_write_byte_data(client, | |
477 | MAX6639_REG_ALERT_LIMIT(i), | |
478 | data->temp_alert[i]); | |
479 | if (err) | |
480 | goto exit; | |
481 | err = i2c_smbus_write_byte_data(client, | |
482 | MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]); | |
483 | if (err) | |
484 | goto exit; | |
485 | ||
486 | /* PWM 120/120 (i.e. 100%) */ | |
487 | data->pwm[i] = 120; | |
488 | err = i2c_smbus_write_byte_data(client, | |
489 | MAX6639_REG_TARGTDUTY(i), data->pwm[i]); | |
490 | if (err) | |
491 | goto exit; | |
492 | } | |
493 | /* Start monitoring */ | |
494 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, | |
177f3b92 | 495 | MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL | |
496 | MAX6639_GCONFIG_PWM_FREQ_HI); | |
a5b79d62 | 497 | exit: |
498 | return err; | |
499 | } | |
500 | ||
501 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
502 | static int max6639_detect(struct i2c_client *client, | |
503 | struct i2c_board_info *info) | |
504 | { | |
505 | struct i2c_adapter *adapter = client->adapter; | |
506 | int dev_id, manu_id; | |
507 | ||
508 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
509 | return -ENODEV; | |
510 | ||
511 | /* Actual detection via device and manufacturer ID */ | |
512 | dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID); | |
513 | manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID); | |
514 | if (dev_id != 0x58 || manu_id != 0x4D) | |
515 | return -ENODEV; | |
516 | ||
f2f394db | 517 | strscpy(info->type, "max6639", I2C_NAME_SIZE); |
a5b79d62 | 518 | |
519 | return 0; | |
520 | } | |
521 | ||
4e2271ea MSB |
522 | static void max6639_regulator_disable(void *data) |
523 | { | |
524 | regulator_disable(data); | |
525 | } | |
526 | ||
67487038 | 527 | static int max6639_probe(struct i2c_client *client) |
a5b79d62 | 528 | { |
c1ea0a04 | 529 | struct device *dev = &client->dev; |
a5b79d62 | 530 | struct max6639_data *data; |
7981c584 | 531 | struct device *hwmon_dev; |
a5b79d62 | 532 | int err; |
533 | ||
c1ea0a04 | 534 | data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL); |
b07405fb GR |
535 | if (!data) |
536 | return -ENOMEM; | |
a5b79d62 | 537 | |
7981c584 | 538 | data->client = client; |
4e2271ea MSB |
539 | |
540 | data->reg = devm_regulator_get_optional(dev, "fan"); | |
541 | if (IS_ERR(data->reg)) { | |
542 | if (PTR_ERR(data->reg) != -ENODEV) | |
543 | return PTR_ERR(data->reg); | |
544 | ||
545 | data->reg = NULL; | |
546 | } else { | |
547 | /* Spin up fans */ | |
548 | err = regulator_enable(data->reg); | |
549 | if (err) { | |
550 | dev_err(dev, "Failed to enable fan supply: %d\n", err); | |
551 | return err; | |
552 | } | |
553 | err = devm_add_action_or_reset(dev, max6639_regulator_disable, | |
554 | data->reg); | |
555 | if (err) { | |
556 | dev_err(dev, "Failed to register action: %d\n", err); | |
557 | return err; | |
558 | } | |
559 | } | |
560 | ||
a5b79d62 | 561 | mutex_init(&data->update_lock); |
562 | ||
563 | /* Initialize the max6639 chip */ | |
7981c584 | 564 | err = max6639_init_client(client, data); |
a5b79d62 | 565 | if (err < 0) |
b07405fb | 566 | return err; |
a5b79d62 | 567 | |
7981c584 GR |
568 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
569 | data, | |
570 | max6639_groups); | |
571 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
a5b79d62 | 572 | } |
573 | ||
52f30f77 | 574 | static int max6639_suspend(struct device *dev) |
a5b79d62 | 575 | { |
52f30f77 | 576 | struct i2c_client *client = to_i2c_client(dev); |
4e2271ea MSB |
577 | struct max6639_data *data = dev_get_drvdata(dev); |
578 | int ret = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); | |
579 | ||
580 | if (ret < 0) | |
581 | return ret; | |
582 | ||
583 | if (data->reg) | |
584 | regulator_disable(data->reg); | |
a5b79d62 | 585 | |
586 | return i2c_smbus_write_byte_data(client, | |
4e2271ea | 587 | MAX6639_REG_GCONFIG, ret | MAX6639_GCONFIG_STANDBY); |
a5b79d62 | 588 | } |
589 | ||
52f30f77 | 590 | static int max6639_resume(struct device *dev) |
a5b79d62 | 591 | { |
52f30f77 | 592 | struct i2c_client *client = to_i2c_client(dev); |
4e2271ea MSB |
593 | struct max6639_data *data = dev_get_drvdata(dev); |
594 | int ret; | |
595 | ||
596 | if (data->reg) { | |
597 | ret = regulator_enable(data->reg); | |
598 | if (ret) { | |
599 | dev_err(dev, "Failed to enable fan supply: %d\n", ret); | |
600 | return ret; | |
601 | } | |
602 | } | |
603 | ||
604 | ret = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); | |
605 | if (ret < 0) | |
606 | return ret; | |
a5b79d62 | 607 | |
608 | return i2c_smbus_write_byte_data(client, | |
4e2271ea | 609 | MAX6639_REG_GCONFIG, ret & ~MAX6639_GCONFIG_STANDBY); |
a5b79d62 | 610 | } |
611 | ||
612 | static const struct i2c_device_id max6639_id[] = { | |
613 | {"max6639", 0}, | |
614 | { } | |
615 | }; | |
616 | ||
617 | MODULE_DEVICE_TABLE(i2c, max6639_id); | |
618 | ||
77563092 | 619 | static DEFINE_SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume); |
52f30f77 | 620 | |
a5b79d62 | 621 | static struct i2c_driver max6639_driver = { |
622 | .class = I2C_CLASS_HWMON, | |
623 | .driver = { | |
624 | .name = "max6639", | |
77563092 | 625 | .pm = pm_sleep_ptr(&max6639_pm_ops), |
a5b79d62 | 626 | }, |
1975d167 | 627 | .probe = max6639_probe, |
a5b79d62 | 628 | .id_table = max6639_id, |
629 | .detect = max6639_detect, | |
630 | .address_list = normal_i2c, | |
631 | }; | |
632 | ||
f0967eea | 633 | module_i2c_driver(max6639_driver); |
a5b79d62 | 634 | |
635 | MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); | |
636 | MODULE_DESCRIPTION("max6639 driver"); | |
637 | MODULE_LICENSE("GPL"); |