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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; |
72 | char valid; /* !=0 if following fields are valid */ | |
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 */ | |
90 | }; | |
91 | ||
92 | static struct max6639_data *max6639_update_device(struct device *dev) | |
93 | { | |
7981c584 GR |
94 | struct max6639_data *data = dev_get_drvdata(dev); |
95 | struct i2c_client *client = data->client; | |
a5b79d62 | 96 | struct max6639_data *ret = data; |
97 | int i; | |
98 | int status_reg; | |
99 | ||
100 | mutex_lock(&data->update_lock); | |
101 | ||
102 | if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { | |
103 | int res; | |
104 | ||
105 | dev_dbg(&client->dev, "Starting max6639 update\n"); | |
106 | ||
107 | status_reg = i2c_smbus_read_byte_data(client, | |
108 | MAX6639_REG_STATUS); | |
109 | if (status_reg < 0) { | |
110 | ret = ERR_PTR(status_reg); | |
111 | goto abort; | |
112 | } | |
113 | ||
114 | data->status = status_reg; | |
115 | ||
116 | for (i = 0; i < 2; i++) { | |
117 | res = i2c_smbus_read_byte_data(client, | |
118 | MAX6639_REG_FAN_CNT(i)); | |
119 | if (res < 0) { | |
120 | ret = ERR_PTR(res); | |
121 | goto abort; | |
122 | } | |
123 | data->fan[i] = res; | |
124 | ||
125 | res = i2c_smbus_read_byte_data(client, | |
126 | MAX6639_REG_TEMP_EXT(i)); | |
127 | if (res < 0) { | |
128 | ret = ERR_PTR(res); | |
129 | goto abort; | |
130 | } | |
131 | data->temp[i] = res >> 5; | |
132 | data->temp_fault[i] = res & 0x01; | |
133 | ||
134 | res = i2c_smbus_read_byte_data(client, | |
135 | MAX6639_REG_TEMP(i)); | |
136 | if (res < 0) { | |
137 | ret = ERR_PTR(res); | |
138 | goto abort; | |
139 | } | |
140 | data->temp[i] |= res << 3; | |
141 | } | |
142 | ||
143 | data->last_updated = jiffies; | |
144 | data->valid = 1; | |
145 | } | |
146 | abort: | |
147 | mutex_unlock(&data->update_lock); | |
148 | ||
149 | return ret; | |
150 | } | |
151 | ||
0a0ab22a | 152 | static ssize_t temp_input_show(struct device *dev, |
a5b79d62 | 153 | struct device_attribute *dev_attr, char *buf) |
154 | { | |
155 | long temp; | |
156 | struct max6639_data *data = max6639_update_device(dev); | |
157 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
158 | ||
159 | if (IS_ERR(data)) | |
160 | return PTR_ERR(data); | |
161 | ||
162 | temp = data->temp[attr->index] * 125; | |
163 | return sprintf(buf, "%ld\n", temp); | |
164 | } | |
165 | ||
0a0ab22a | 166 | static ssize_t temp_fault_show(struct device *dev, |
a5b79d62 | 167 | struct device_attribute *dev_attr, char *buf) |
168 | { | |
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 | return sprintf(buf, "%d\n", data->temp_fault[attr->index]); | |
176 | } | |
177 | ||
0a0ab22a | 178 | static ssize_t temp_max_show(struct device *dev, |
a5b79d62 | 179 | struct device_attribute *dev_attr, char *buf) |
180 | { | |
a5b79d62 | 181 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 182 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 183 | |
184 | return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000)); | |
185 | } | |
186 | ||
0a0ab22a GR |
187 | static ssize_t temp_max_store(struct device *dev, |
188 | struct device_attribute *dev_attr, | |
189 | const char *buf, size_t count) | |
a5b79d62 | 190 | { |
a5b79d62 | 191 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
192 | struct max6639_data *data = dev_get_drvdata(dev); |
193 | struct i2c_client *client = data->client; | |
a5b79d62 | 194 | unsigned long val; |
195 | int res; | |
196 | ||
179c4fdb | 197 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 198 | if (res) |
199 | return res; | |
200 | ||
201 | mutex_lock(&data->update_lock); | |
202 | data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val); | |
203 | i2c_smbus_write_byte_data(client, | |
204 | MAX6639_REG_THERM_LIMIT(attr->index), | |
205 | data->temp_therm[attr->index]); | |
206 | mutex_unlock(&data->update_lock); | |
207 | return count; | |
208 | } | |
209 | ||
0a0ab22a | 210 | static ssize_t temp_crit_show(struct device *dev, |
a5b79d62 | 211 | struct device_attribute *dev_attr, char *buf) |
212 | { | |
a5b79d62 | 213 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 214 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 215 | |
216 | return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000)); | |
217 | } | |
218 | ||
0a0ab22a GR |
219 | static ssize_t temp_crit_store(struct device *dev, |
220 | struct device_attribute *dev_attr, | |
221 | const char *buf, size_t count) | |
a5b79d62 | 222 | { |
a5b79d62 | 223 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
224 | struct max6639_data *data = dev_get_drvdata(dev); |
225 | struct i2c_client *client = data->client; | |
a5b79d62 | 226 | unsigned long val; |
227 | int res; | |
228 | ||
179c4fdb | 229 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 230 | if (res) |
231 | return res; | |
232 | ||
233 | mutex_lock(&data->update_lock); | |
234 | data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val); | |
235 | i2c_smbus_write_byte_data(client, | |
236 | MAX6639_REG_ALERT_LIMIT(attr->index), | |
237 | data->temp_alert[attr->index]); | |
238 | mutex_unlock(&data->update_lock); | |
239 | return count; | |
240 | } | |
241 | ||
0a0ab22a | 242 | static ssize_t temp_emergency_show(struct device *dev, |
a5b79d62 | 243 | struct device_attribute *dev_attr, |
244 | char *buf) | |
245 | { | |
a5b79d62 | 246 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 247 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 248 | |
249 | return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000)); | |
250 | } | |
251 | ||
0a0ab22a GR |
252 | static ssize_t temp_emergency_store(struct device *dev, |
253 | struct device_attribute *dev_attr, | |
254 | const char *buf, size_t count) | |
a5b79d62 | 255 | { |
a5b79d62 | 256 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
257 | struct max6639_data *data = dev_get_drvdata(dev); |
258 | struct i2c_client *client = data->client; | |
a5b79d62 | 259 | unsigned long val; |
260 | int res; | |
261 | ||
179c4fdb | 262 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 263 | if (res) |
264 | return res; | |
265 | ||
266 | mutex_lock(&data->update_lock); | |
267 | data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val); | |
268 | i2c_smbus_write_byte_data(client, | |
269 | MAX6639_REG_OT_LIMIT(attr->index), | |
270 | data->temp_ot[attr->index]); | |
271 | mutex_unlock(&data->update_lock); | |
272 | return count; | |
273 | } | |
274 | ||
0a0ab22a GR |
275 | static ssize_t pwm_show(struct device *dev, struct device_attribute *dev_attr, |
276 | char *buf) | |
a5b79d62 | 277 | { |
a5b79d62 | 278 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 | 279 | struct max6639_data *data = dev_get_drvdata(dev); |
a5b79d62 | 280 | |
281 | return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120); | |
282 | } | |
283 | ||
0a0ab22a GR |
284 | static ssize_t pwm_store(struct device *dev, |
285 | struct device_attribute *dev_attr, const char *buf, | |
286 | size_t count) | |
a5b79d62 | 287 | { |
a5b79d62 | 288 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); |
7981c584 GR |
289 | struct max6639_data *data = dev_get_drvdata(dev); |
290 | struct i2c_client *client = data->client; | |
a5b79d62 | 291 | unsigned long val; |
292 | int res; | |
293 | ||
179c4fdb | 294 | res = kstrtoul(buf, 10, &val); |
a5b79d62 | 295 | if (res) |
296 | return res; | |
297 | ||
2a844c14 | 298 | val = clamp_val(val, 0, 255); |
a5b79d62 | 299 | |
300 | mutex_lock(&data->update_lock); | |
301 | data->pwm[attr->index] = (u8)(val * 120 / 255); | |
302 | i2c_smbus_write_byte_data(client, | |
303 | MAX6639_REG_TARGTDUTY(attr->index), | |
304 | data->pwm[attr->index]); | |
305 | mutex_unlock(&data->update_lock); | |
306 | return count; | |
307 | } | |
308 | ||
0a0ab22a | 309 | static ssize_t fan_input_show(struct device *dev, |
a5b79d62 | 310 | struct device_attribute *dev_attr, char *buf) |
311 | { | |
312 | struct max6639_data *data = max6639_update_device(dev); | |
313 | struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); | |
314 | ||
315 | if (IS_ERR(data)) | |
316 | return PTR_ERR(data); | |
317 | ||
318 | return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], | |
b63d97a3 | 319 | data->rpm_range)); |
a5b79d62 | 320 | } |
321 | ||
0a0ab22a | 322 | static ssize_t alarm_show(struct device *dev, |
a5b79d62 | 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", !!(data->status & (1 << attr->index))); | |
332 | } | |
333 | ||
0a0ab22a GR |
334 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0); |
335 | static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1); | |
336 | static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0); | |
337 | static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1); | |
338 | static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0); | |
339 | static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1); | |
340 | static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0); | |
341 | static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1); | |
342 | static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0); | |
343 | static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1); | |
344 | static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0); | |
345 | static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1); | |
346 | static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0); | |
347 | static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1); | |
348 | static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1); | |
349 | static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0); | |
350 | static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3); | |
351 | static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2); | |
352 | static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7); | |
353 | static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6); | |
354 | static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5); | |
355 | static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4); | |
a5b79d62 | 356 | |
357 | ||
7981c584 | 358 | static struct attribute *max6639_attrs[] = { |
a5b79d62 | 359 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
360 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
361 | &sensor_dev_attr_temp1_fault.dev_attr.attr, | |
362 | &sensor_dev_attr_temp2_fault.dev_attr.attr, | |
363 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
364 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
365 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
366 | &sensor_dev_attr_temp2_crit.dev_attr.attr, | |
367 | &sensor_dev_attr_temp1_emergency.dev_attr.attr, | |
368 | &sensor_dev_attr_temp2_emergency.dev_attr.attr, | |
369 | &sensor_dev_attr_pwm1.dev_attr.attr, | |
370 | &sensor_dev_attr_pwm2.dev_attr.attr, | |
371 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
372 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
373 | &sensor_dev_attr_fan1_fault.dev_attr.attr, | |
374 | &sensor_dev_attr_fan2_fault.dev_attr.attr, | |
375 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
376 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, | |
377 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
378 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, | |
379 | &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, | |
380 | &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr, | |
381 | NULL | |
382 | }; | |
7981c584 | 383 | ATTRIBUTE_GROUPS(max6639); |
a5b79d62 | 384 | |
385 | /* | |
386 | * returns respective index in rpm_ranges table | |
387 | * 1 by default on invalid range | |
388 | */ | |
389 | static int rpm_range_to_reg(int range) | |
390 | { | |
391 | int i; | |
392 | ||
393 | for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) { | |
394 | if (rpm_ranges[i] == range) | |
395 | return i; | |
396 | } | |
397 | ||
398 | return 1; /* default: 4000 RPM */ | |
399 | } | |
400 | ||
7981c584 GR |
401 | static int max6639_init_client(struct i2c_client *client, |
402 | struct max6639_data *data) | |
a5b79d62 | 403 | { |
a5b79d62 | 404 | struct max6639_platform_data *max6639_info = |
a8b3a3a5 | 405 | dev_get_platdata(&client->dev); |
2f2da1ac | 406 | int i; |
a5b79d62 | 407 | int rpm_range = 1; /* default: 4000 RPM */ |
2f2da1ac | 408 | int err; |
a5b79d62 | 409 | |
177f3b92 | 410 | /* Reset chip to default values, see below for GCONFIG setup */ |
a5b79d62 | 411 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, |
412 | MAX6639_GCONFIG_POR); | |
413 | if (err) | |
414 | goto exit; | |
415 | ||
416 | /* Fans pulse per revolution is 2 by default */ | |
417 | if (max6639_info && max6639_info->ppr > 0 && | |
418 | max6639_info->ppr < 5) | |
419 | data->ppr = max6639_info->ppr; | |
420 | else | |
421 | data->ppr = 2; | |
422 | data->ppr -= 1; | |
a5b79d62 | 423 | |
424 | if (max6639_info) | |
425 | rpm_range = rpm_range_to_reg(max6639_info->rpm_range); | |
426 | data->rpm_range = rpm_range; | |
427 | ||
428 | for (i = 0; i < 2; i++) { | |
429 | ||
2f2da1ac CS |
430 | /* Set Fan pulse per revolution */ |
431 | err = i2c_smbus_write_byte_data(client, | |
432 | MAX6639_REG_FAN_PPR(i), | |
433 | data->ppr << 6); | |
434 | if (err) | |
435 | goto exit; | |
436 | ||
a5b79d62 | 437 | /* Fans config PWM, RPM */ |
438 | err = i2c_smbus_write_byte_data(client, | |
439 | MAX6639_REG_FAN_CONFIG1(i), | |
440 | MAX6639_FAN_CONFIG1_PWM | rpm_range); | |
441 | if (err) | |
442 | goto exit; | |
443 | ||
444 | /* Fans PWM polarity high by default */ | |
445 | if (max6639_info && max6639_info->pwm_polarity == 0) | |
446 | err = i2c_smbus_write_byte_data(client, | |
447 | MAX6639_REG_FAN_CONFIG2a(i), 0x00); | |
448 | else | |
449 | err = i2c_smbus_write_byte_data(client, | |
450 | MAX6639_REG_FAN_CONFIG2a(i), 0x02); | |
451 | if (err) | |
452 | goto exit; | |
453 | ||
177f3b92 | 454 | /* |
455 | * /THERM full speed enable, | |
456 | * PWM frequency 25kHz, see also GCONFIG below | |
457 | */ | |
458 | err = i2c_smbus_write_byte_data(client, | |
459 | MAX6639_REG_FAN_CONFIG3(i), | |
460 | MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03); | |
461 | if (err) | |
462 | goto exit; | |
463 | ||
a5b79d62 | 464 | /* Max. temp. 80C/90C/100C */ |
465 | data->temp_therm[i] = 80; | |
466 | data->temp_alert[i] = 90; | |
467 | data->temp_ot[i] = 100; | |
468 | err = i2c_smbus_write_byte_data(client, | |
469 | MAX6639_REG_THERM_LIMIT(i), | |
470 | data->temp_therm[i]); | |
471 | if (err) | |
472 | goto exit; | |
473 | err = i2c_smbus_write_byte_data(client, | |
474 | MAX6639_REG_ALERT_LIMIT(i), | |
475 | data->temp_alert[i]); | |
476 | if (err) | |
477 | goto exit; | |
478 | err = i2c_smbus_write_byte_data(client, | |
479 | MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]); | |
480 | if (err) | |
481 | goto exit; | |
482 | ||
483 | /* PWM 120/120 (i.e. 100%) */ | |
484 | data->pwm[i] = 120; | |
485 | err = i2c_smbus_write_byte_data(client, | |
486 | MAX6639_REG_TARGTDUTY(i), data->pwm[i]); | |
487 | if (err) | |
488 | goto exit; | |
489 | } | |
490 | /* Start monitoring */ | |
491 | err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, | |
177f3b92 | 492 | MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL | |
493 | MAX6639_GCONFIG_PWM_FREQ_HI); | |
a5b79d62 | 494 | exit: |
495 | return err; | |
496 | } | |
497 | ||
498 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
499 | static int max6639_detect(struct i2c_client *client, | |
500 | struct i2c_board_info *info) | |
501 | { | |
502 | struct i2c_adapter *adapter = client->adapter; | |
503 | int dev_id, manu_id; | |
504 | ||
505 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
506 | return -ENODEV; | |
507 | ||
508 | /* Actual detection via device and manufacturer ID */ | |
509 | dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID); | |
510 | manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID); | |
511 | if (dev_id != 0x58 || manu_id != 0x4D) | |
512 | return -ENODEV; | |
513 | ||
514 | strlcpy(info->type, "max6639", I2C_NAME_SIZE); | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | static int max6639_probe(struct i2c_client *client, | |
520 | const struct i2c_device_id *id) | |
521 | { | |
c1ea0a04 | 522 | struct device *dev = &client->dev; |
a5b79d62 | 523 | struct max6639_data *data; |
7981c584 | 524 | struct device *hwmon_dev; |
a5b79d62 | 525 | int err; |
526 | ||
c1ea0a04 | 527 | data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL); |
b07405fb GR |
528 | if (!data) |
529 | return -ENOMEM; | |
a5b79d62 | 530 | |
7981c584 | 531 | data->client = client; |
a5b79d62 | 532 | mutex_init(&data->update_lock); |
533 | ||
534 | /* Initialize the max6639 chip */ | |
7981c584 | 535 | err = max6639_init_client(client, data); |
a5b79d62 | 536 | if (err < 0) |
b07405fb | 537 | return err; |
a5b79d62 | 538 | |
7981c584 GR |
539 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
540 | data, | |
541 | max6639_groups); | |
542 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
a5b79d62 | 543 | } |
544 | ||
52f30f77 MB |
545 | #ifdef CONFIG_PM_SLEEP |
546 | static int max6639_suspend(struct device *dev) | |
a5b79d62 | 547 | { |
52f30f77 | 548 | struct i2c_client *client = to_i2c_client(dev); |
a5b79d62 | 549 | int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); |
550 | if (data < 0) | |
551 | return data; | |
552 | ||
553 | return i2c_smbus_write_byte_data(client, | |
554 | MAX6639_REG_GCONFIG, data | MAX6639_GCONFIG_STANDBY); | |
555 | } | |
556 | ||
52f30f77 | 557 | static int max6639_resume(struct device *dev) |
a5b79d62 | 558 | { |
52f30f77 | 559 | struct i2c_client *client = to_i2c_client(dev); |
a5b79d62 | 560 | int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); |
561 | if (data < 0) | |
562 | return data; | |
563 | ||
564 | return i2c_smbus_write_byte_data(client, | |
565 | MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY); | |
566 | } | |
52f30f77 | 567 | #endif /* CONFIG_PM_SLEEP */ |
a5b79d62 | 568 | |
569 | static const struct i2c_device_id max6639_id[] = { | |
570 | {"max6639", 0}, | |
571 | { } | |
572 | }; | |
573 | ||
574 | MODULE_DEVICE_TABLE(i2c, max6639_id); | |
575 | ||
768821a3 | 576 | static SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume); |
52f30f77 | 577 | |
a5b79d62 | 578 | static struct i2c_driver max6639_driver = { |
579 | .class = I2C_CLASS_HWMON, | |
580 | .driver = { | |
581 | .name = "max6639", | |
52f30f77 | 582 | .pm = &max6639_pm_ops, |
a5b79d62 | 583 | }, |
584 | .probe = max6639_probe, | |
a5b79d62 | 585 | .id_table = max6639_id, |
586 | .detect = max6639_detect, | |
587 | .address_list = normal_i2c, | |
588 | }; | |
589 | ||
f0967eea | 590 | module_i2c_driver(max6639_driver); |
a5b79d62 | 591 | |
592 | MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); | |
593 | MODULE_DESCRIPTION("max6639 driver"); | |
594 | MODULE_LICENSE("GPL"); |