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1 | /* |
2 | * emc2103.c - Support for SMSC EMC2103 |
3 | * Copyright (c) 2010 SMSC |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
18 | */ |
19 | |
20 | #include <linux/module.h> |
21 | #include <linux/init.h> |
22 | #include <linux/slab.h> |
23 | #include <linux/jiffies.h> |
24 | #include <linux/i2c.h> |
25 | #include <linux/hwmon.h> |
26 | #include <linux/hwmon-sysfs.h> |
27 | #include <linux/err.h> |
28 | #include <linux/mutex.h> |
29 | |
30 | /* Addresses scanned */ |
31 | static const unsigned short normal_i2c[] = { 0x2E, I2C_CLIENT_END }; |
32 | |
33 | static const u8 REG_TEMP[4] = { 0x00, 0x02, 0x04, 0x06 }; |
34 | static const u8 REG_TEMP_MIN[4] = { 0x3c, 0x38, 0x39, 0x3a }; |
35 | static const u8 REG_TEMP_MAX[4] = { 0x34, 0x30, 0x31, 0x32 }; |
36 | |
37 | #define REG_CONF1 0x20 |
38 | #define REG_TEMP_MAX_ALARM 0x24 |
39 | #define REG_TEMP_MIN_ALARM 0x25 |
40 | #define REG_FAN_CONF1 0x42 |
41 | #define REG_FAN_TARGET_LO 0x4c |
42 | #define REG_FAN_TARGET_HI 0x4d |
43 | #define REG_FAN_TACH_HI 0x4e |
44 | #define REG_FAN_TACH_LO 0x4f |
45 | #define REG_PRODUCT_ID 0xfd |
46 | #define REG_MFG_ID 0xfe |
47 | |
48 | /* equation 4 from datasheet: rpm = (3932160 * multipler) / count */ |
49 | #define FAN_RPM_FACTOR 3932160 |
50 | |
51 | /* |
52 | * 2103-2 and 2103-4's 3rd temperature sensor can be connected to two diodes |
53 | * in anti-parallel mode, and in this configuration both can be read |
54 | * independently (so we have 4 temperature inputs). The device can't |
55 | * detect if it's connected in this mode, so we have to manually enable |
56 | * it. Default is to leave the device in the state it's already in (-1). |
57 | * This parameter allows APD mode to be optionally forced on or off |
58 | */ |
59 | static int apd = -1; |
60 | module_param(apd, bint, 0); |
61 | MODULE_PARM_DESC(init, "Set to zero to disable anti-parallel diode mode"); |
62 | |
63 | struct temperature { |
64 | s8 degrees; |
65 | u8 fraction; /* 0-7 multiples of 0.125 */ |
66 | }; |
67 | |
68 | struct emc2103_data { |
69 | struct device *hwmon_dev; |
70 | struct mutex update_lock; |
71 | bool valid; /* registers are valid */ |
72 | bool fan_rpm_control; |
73 | int temp_count; /* num of temp sensors */ |
74 | unsigned long last_updated; /* in jiffies */ |
75 | struct temperature temp[4]; /* internal + 3 external */ |
76 | s8 temp_min[4]; /* no fractional part */ |
77 | s8 temp_max[4]; /* no fractional part */ |
78 | u8 temp_min_alarm; |
79 | u8 temp_max_alarm; |
80 | u8 fan_multiplier; |
81 | u16 fan_tach; |
82 | u16 fan_target; |
83 | }; |
84 | |
85 | static int read_u8_from_i2c(struct i2c_client *client, u8 i2c_reg, u8 *output) |
86 | { |
87 | int status = i2c_smbus_read_byte_data(client, i2c_reg); |
88 | if (status < 0) { |
89 | dev_warn(&client->dev, "reg 0x%02x, err %d\n", |
90 | i2c_reg, status); |
91 | } else { |
92 | *output = status; |
93 | } |
94 | return status; |
95 | } |
96 | |
97 | static void read_temp_from_i2c(struct i2c_client *client, u8 i2c_reg, |
98 | struct temperature *temp) |
99 | { |
100 | u8 degrees, fractional; |
101 | |
102 | if (read_u8_from_i2c(client, i2c_reg, °rees) < 0) |
103 | return; |
104 | |
105 | if (read_u8_from_i2c(client, i2c_reg + 1, &fractional) < 0) |
106 | return; |
107 | |
108 | temp->degrees = degrees; |
109 | temp->fraction = (fractional & 0xe0) >> 5; |
110 | } |
111 | |
112 | static void read_fan_from_i2c(struct i2c_client *client, u16 *output, |
113 | u8 hi_addr, u8 lo_addr) |
114 | { |
115 | u8 high_byte, lo_byte; |
116 | |
117 | if (read_u8_from_i2c(client, hi_addr, &high_byte) < 0) |
118 | return; |
119 | |
120 | if (read_u8_from_i2c(client, lo_addr, &lo_byte) < 0) |
121 | return; |
122 | |
123 | *output = ((u16)high_byte << 5) | (lo_byte >> 3); |
124 | } |
125 | |
126 | static void write_fan_target_to_i2c(struct i2c_client *client, u16 new_target) |
127 | { |
128 | u8 high_byte = (new_target & 0x1fe0) >> 5; |
129 | u8 low_byte = (new_target & 0x001f) << 3; |
130 | i2c_smbus_write_byte_data(client, REG_FAN_TARGET_LO, low_byte); |
131 | i2c_smbus_write_byte_data(client, REG_FAN_TARGET_HI, high_byte); |
132 | } |
133 | |
134 | static void read_fan_config_from_i2c(struct i2c_client *client) |
135 | |
136 | { |
137 | struct emc2103_data *data = i2c_get_clientdata(client); |
138 | u8 conf1; |
139 | |
140 | if (read_u8_from_i2c(client, REG_FAN_CONF1, &conf1) < 0) |
141 | return; |
142 | |
143 | data->fan_multiplier = 1 << ((conf1 & 0x60) >> 5); |
144 | data->fan_rpm_control = (conf1 & 0x80) != 0; |
145 | } |
146 | |
147 | static struct emc2103_data *emc2103_update_device(struct device *dev) |
148 | { |
149 | struct i2c_client *client = to_i2c_client(dev); |
150 | struct emc2103_data *data = i2c_get_clientdata(client); |
151 | |
152 | mutex_lock(&data->update_lock); |
153 | |
154 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
155 | || !data->valid) { |
156 | int i; |
157 | |
158 | for (i = 0; i < data->temp_count; i++) { |
159 | read_temp_from_i2c(client, REG_TEMP[i], &data->temp[i]); |
160 | read_u8_from_i2c(client, REG_TEMP_MIN[i], |
161 | &data->temp_min[i]); |
162 | read_u8_from_i2c(client, REG_TEMP_MAX[i], |
163 | &data->temp_max[i]); |
164 | } |
165 | |
166 | read_u8_from_i2c(client, REG_TEMP_MIN_ALARM, |
167 | &data->temp_min_alarm); |
168 | read_u8_from_i2c(client, REG_TEMP_MAX_ALARM, |
169 | &data->temp_max_alarm); |
170 | |
171 | read_fan_from_i2c(client, &data->fan_tach, |
172 | REG_FAN_TACH_HI, REG_FAN_TACH_LO); |
173 | read_fan_from_i2c(client, &data->fan_target, |
174 | REG_FAN_TARGET_HI, REG_FAN_TARGET_LO); |
175 | read_fan_config_from_i2c(client); |
176 | |
177 | data->last_updated = jiffies; |
178 | data->valid = true; |
179 | } |
180 | |
181 | mutex_unlock(&data->update_lock); |
182 | |
183 | return data; |
184 | } |
185 | |
186 | static ssize_t |
187 | show_temp(struct device *dev, struct device_attribute *da, char *buf) |
188 | { |
189 | int nr = to_sensor_dev_attr(da)->index; |
190 | struct emc2103_data *data = emc2103_update_device(dev); |
191 | int millidegrees = data->temp[nr].degrees * 1000 |
192 | + data->temp[nr].fraction * 125; |
193 | return sprintf(buf, "%d\n", millidegrees); |
194 | } |
195 | |
196 | static ssize_t |
197 | show_temp_min(struct device *dev, struct device_attribute *da, char *buf) |
198 | { |
199 | int nr = to_sensor_dev_attr(da)->index; |
200 | struct emc2103_data *data = emc2103_update_device(dev); |
201 | int millidegrees = data->temp_min[nr] * 1000; |
202 | return sprintf(buf, "%d\n", millidegrees); |
203 | } |
204 | |
205 | static ssize_t |
206 | show_temp_max(struct device *dev, struct device_attribute *da, char *buf) |
207 | { |
208 | int nr = to_sensor_dev_attr(da)->index; |
209 | struct emc2103_data *data = emc2103_update_device(dev); |
210 | int millidegrees = data->temp_max[nr] * 1000; |
211 | return sprintf(buf, "%d\n", millidegrees); |
212 | } |
213 | |
214 | static ssize_t |
215 | show_temp_fault(struct device *dev, struct device_attribute *da, char *buf) |
216 | { |
217 | int nr = to_sensor_dev_attr(da)->index; |
218 | struct emc2103_data *data = emc2103_update_device(dev); |
219 | bool fault = (data->temp[nr].degrees == -128); |
220 | return sprintf(buf, "%d\n", fault ? 1 : 0); |
221 | } |
222 | |
223 | static ssize_t |
224 | show_temp_min_alarm(struct device *dev, struct device_attribute *da, char *buf) |
225 | { |
226 | int nr = to_sensor_dev_attr(da)->index; |
227 | struct emc2103_data *data = emc2103_update_device(dev); |
228 | bool alarm = data->temp_min_alarm & (1 << nr); |
229 | return sprintf(buf, "%d\n", alarm ? 1 : 0); |
230 | } |
231 | |
232 | static ssize_t |
233 | show_temp_max_alarm(struct device *dev, struct device_attribute *da, char *buf) |
234 | { |
235 | int nr = to_sensor_dev_attr(da)->index; |
236 | struct emc2103_data *data = emc2103_update_device(dev); |
237 | bool alarm = data->temp_max_alarm & (1 << nr); |
238 | return sprintf(buf, "%d\n", alarm ? 1 : 0); |
239 | } |
240 | |
241 | static ssize_t set_temp_min(struct device *dev, struct device_attribute *da, |
242 | const char *buf, size_t count) |
243 | { |
244 | int nr = to_sensor_dev_attr(da)->index; |
245 | struct i2c_client *client = to_i2c_client(dev); |
246 | struct emc2103_data *data = i2c_get_clientdata(client); |
247 | long val; |
248 | |
249 | int result = kstrtol(buf, 10, &val); |
250 | if (result < 0) |
251 | return -EINVAL; |
252 | |
253 | val = DIV_ROUND_CLOSEST(val, 1000); |
254 | if ((val < -63) || (val > 127)) |
255 | return -EINVAL; |
256 | |
257 | mutex_lock(&data->update_lock); |
258 | data->temp_min[nr] = val; |
259 | i2c_smbus_write_byte_data(client, REG_TEMP_MIN[nr], val); |
260 | mutex_unlock(&data->update_lock); |
261 | |
262 | return count; |
263 | } |
264 | |
265 | static ssize_t set_temp_max(struct device *dev, struct device_attribute *da, |
266 | const char *buf, size_t count) |
267 | { |
268 | int nr = to_sensor_dev_attr(da)->index; |
269 | struct i2c_client *client = to_i2c_client(dev); |
270 | struct emc2103_data *data = i2c_get_clientdata(client); |
271 | long val; |
272 | |
273 | int result = kstrtol(buf, 10, &val); |
274 | if (result < 0) |
275 | return -EINVAL; |
276 | |
277 | val = DIV_ROUND_CLOSEST(val, 1000); |
278 | if ((val < -63) || (val > 127)) |
279 | return -EINVAL; |
280 | |
281 | mutex_lock(&data->update_lock); |
282 | data->temp_max[nr] = val; |
283 | i2c_smbus_write_byte_data(client, REG_TEMP_MAX[nr], val); |
284 | mutex_unlock(&data->update_lock); |
285 | |
286 | return count; |
287 | } |
288 | |
289 | static ssize_t |
290 | show_fan(struct device *dev, struct device_attribute *da, char *buf) |
291 | { |
292 | struct emc2103_data *data = emc2103_update_device(dev); |
293 | int rpm = 0; |
294 | if (data->fan_tach != 0) |
295 | rpm = (FAN_RPM_FACTOR * data->fan_multiplier) / data->fan_tach; |
296 | return sprintf(buf, "%d\n", rpm); |
297 | } |
298 | |
299 | static ssize_t |
300 | show_fan_div(struct device *dev, struct device_attribute *da, char *buf) |
301 | { |
302 | struct emc2103_data *data = emc2103_update_device(dev); |
303 | int fan_div = 8 / data->fan_multiplier; |
304 | return sprintf(buf, "%d\n", fan_div); |
305 | } |
306 | |
307 | /* |
308 | * Note: we also update the fan target here, because its value is |
309 | * determined in part by the fan clock divider. This follows the principle |
310 | * of least surprise; the user doesn't expect the fan target to change just |
311 | * because the divider changed. |
312 | */ |
313 | static ssize_t set_fan_div(struct device *dev, struct device_attribute *da, |
314 | const char *buf, size_t count) |
315 | { |
316 | struct emc2103_data *data = emc2103_update_device(dev); |
317 | struct i2c_client *client = to_i2c_client(dev); |
318 | int new_range_bits, old_div = 8 / data->fan_multiplier; |
319 | long new_div; |
320 | |
321 | int status = kstrtol(buf, 10, &new_div); |
322 | if (status < 0) |
323 | return -EINVAL; |
324 | |
325 | if (new_div == old_div) /* No change */ |
326 | return count; |
327 | |
328 | switch (new_div) { |
329 | case 1: |
330 | new_range_bits = 3; |
331 | break; |
332 | case 2: |
333 | new_range_bits = 2; |
334 | break; |
335 | case 4: |
336 | new_range_bits = 1; |
337 | break; |
338 | case 8: |
339 | new_range_bits = 0; |
340 | break; |
341 | default: |
342 | return -EINVAL; |
343 | } |
344 | |
345 | mutex_lock(&data->update_lock); |
346 | |
347 | status = i2c_smbus_read_byte_data(client, REG_FAN_CONF1); |
348 | if (status < 0) { |
349 | dev_dbg(&client->dev, "reg 0x%02x, err %d\n", |
350 | REG_FAN_CONF1, status); |
351 | mutex_unlock(&data->update_lock); |
352 | return -EIO; |
353 | } |
354 | status &= 0x9F; |
355 | status |= (new_range_bits << 5); |
356 | i2c_smbus_write_byte_data(client, REG_FAN_CONF1, status); |
357 | |
358 | data->fan_multiplier = 8 / new_div; |
359 | |
360 | /* update fan target if high byte is not disabled */ |
361 | if ((data->fan_target & 0x1fe0) != 0x1fe0) { |
362 | u16 new_target = (data->fan_target * old_div) / new_div; |
363 | data->fan_target = min(new_target, (u16)0x1fff); |
364 | write_fan_target_to_i2c(client, data->fan_target); |
365 | } |
366 | |
367 | /* invalidate data to force re-read from hardware */ |
368 | data->valid = false; |
369 | |
370 | mutex_unlock(&data->update_lock); |
371 | return count; |
372 | } |
373 | |
374 | static ssize_t |
375 | show_fan_target(struct device *dev, struct device_attribute *da, char *buf) |
376 | { |
377 | struct emc2103_data *data = emc2103_update_device(dev); |
378 | int rpm = 0; |
379 | |
380 | /* high byte of 0xff indicates disabled so return 0 */ |
381 | if ((data->fan_target != 0) && ((data->fan_target & 0x1fe0) != 0x1fe0)) |
382 | rpm = (FAN_RPM_FACTOR * data->fan_multiplier) |
383 | / data->fan_target; |
384 | |
385 | return sprintf(buf, "%d\n", rpm); |
386 | } |
387 | |
388 | static ssize_t set_fan_target(struct device *dev, struct device_attribute *da, |
389 | const char *buf, size_t count) |
390 | { |
391 | struct emc2103_data *data = emc2103_update_device(dev); |
392 | struct i2c_client *client = to_i2c_client(dev); |
393 | long rpm_target; |
394 | |
395 | int result = kstrtol(buf, 10, &rpm_target); |
396 | if (result < 0) |
397 | return -EINVAL; |
398 | |
399 | /* Datasheet states 16384 as maximum RPM target (table 3.2) */ |
400 | if ((rpm_target < 0) || (rpm_target > 16384)) |
401 | return -EINVAL; |
402 | |
403 | mutex_lock(&data->update_lock); |
404 | |
405 | if (rpm_target == 0) |
406 | data->fan_target = 0x1fff; |
407 | else |
408 | data->fan_target = clamp_val( |
409 | (FAN_RPM_FACTOR * data->fan_multiplier) / rpm_target, |
410 | 0, 0x1fff); |
411 | |
412 | write_fan_target_to_i2c(client, data->fan_target); |
413 | |
414 | mutex_unlock(&data->update_lock); |
415 | return count; |
416 | } |
417 | |
418 | static ssize_t |
419 | show_fan_fault(struct device *dev, struct device_attribute *da, char *buf) |
420 | { |
421 | struct emc2103_data *data = emc2103_update_device(dev); |
422 | bool fault = ((data->fan_tach & 0x1fe0) == 0x1fe0); |
423 | return sprintf(buf, "%d\n", fault ? 1 : 0); |
424 | } |
425 | |
426 | static ssize_t |
427 | show_pwm_enable(struct device *dev, struct device_attribute *da, char *buf) |
428 | { |
429 | struct emc2103_data *data = emc2103_update_device(dev); |
430 | return sprintf(buf, "%d\n", data->fan_rpm_control ? 3 : 0); |
431 | } |
432 | |
433 | static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *da, |
434 | const char *buf, size_t count) |
435 | { |
436 | struct i2c_client *client = to_i2c_client(dev); |
437 | struct emc2103_data *data = i2c_get_clientdata(client); |
438 | long new_value; |
439 | u8 conf_reg; |
440 | |
441 | int result = kstrtol(buf, 10, &new_value); |
442 | if (result < 0) |
443 | return -EINVAL; |
444 | |
445 | mutex_lock(&data->update_lock); |
446 | switch (new_value) { |
447 | case 0: |
448 | data->fan_rpm_control = false; |
449 | break; |
450 | case 3: |
451 | data->fan_rpm_control = true; |
452 | break; |
453 | default: |
454 | count = -EINVAL; |
455 | goto err; |
456 | } |
457 | |
458 | result = read_u8_from_i2c(client, REG_FAN_CONF1, &conf_reg); |
459 | if (result) { |
460 | count = result; |
461 | goto err; |
462 | } |
463 | |
464 | if (data->fan_rpm_control) |
465 | conf_reg |= 0x80; |
466 | else |
467 | conf_reg &= ~0x80; |
468 | |
469 | i2c_smbus_write_byte_data(client, REG_FAN_CONF1, conf_reg); |
470 | err: |
471 | mutex_unlock(&data->update_lock); |
472 | return count; |
473 | } |
474 | |
475 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
476 | static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, show_temp_min, |
477 | set_temp_min, 0); |
478 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp_max, |
479 | set_temp_max, 0); |
480 | static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0); |
481 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_temp_min_alarm, |
482 | NULL, 0); |
483 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_temp_max_alarm, |
484 | NULL, 0); |
485 | |
486 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); |
487 | static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, show_temp_min, |
488 | set_temp_min, 1); |
489 | static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, show_temp_max, |
490 | set_temp_max, 1); |
491 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1); |
492 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_temp_min_alarm, |
493 | NULL, 1); |
494 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_temp_max_alarm, |
495 | NULL, 1); |
496 | |
497 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); |
498 | static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR, show_temp_min, |
499 | set_temp_min, 2); |
500 | static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR, show_temp_max, |
501 | set_temp_max, 2); |
502 | static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2); |
503 | static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_temp_min_alarm, |
504 | NULL, 2); |
505 | static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_temp_max_alarm, |
506 | NULL, 2); |
507 | |
508 | static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); |
509 | static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO | S_IWUSR, show_temp_min, |
510 | set_temp_min, 3); |
511 | static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO | S_IWUSR, show_temp_max, |
512 | set_temp_max, 3); |
513 | static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3); |
514 | static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_temp_min_alarm, |
515 | NULL, 3); |
516 | static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_temp_max_alarm, |
517 | NULL, 3); |
518 | |
519 | static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL); |
520 | static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, show_fan_div, set_fan_div); |
521 | static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_fan_target, |
522 | set_fan_target); |
523 | static DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL); |
524 | |
525 | static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_pwm_enable, |
526 | set_pwm_enable); |
527 | |
528 | /* sensors present on all models */ |
529 | static struct attribute *emc2103_attributes[] = { |
530 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
531 | &sensor_dev_attr_temp1_min.dev_attr.attr, |
532 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
533 | &sensor_dev_attr_temp1_fault.dev_attr.attr, |
534 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
535 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
536 | &sensor_dev_attr_temp2_input.dev_attr.attr, |
537 | &sensor_dev_attr_temp2_min.dev_attr.attr, |
538 | &sensor_dev_attr_temp2_max.dev_attr.attr, |
539 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
540 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
541 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
542 | &dev_attr_fan1_input.attr, |
543 | &dev_attr_fan1_div.attr, |
544 | &dev_attr_fan1_target.attr, |
545 | &dev_attr_fan1_fault.attr, |
546 | &dev_attr_pwm1_enable.attr, |
547 | NULL |
548 | }; |
549 | |
550 | /* extra temperature sensors only present on 2103-2 and 2103-4 */ |
551 | static struct attribute *emc2103_attributes_temp3[] = { |
552 | &sensor_dev_attr_temp3_input.dev_attr.attr, |
553 | &sensor_dev_attr_temp3_min.dev_attr.attr, |
554 | &sensor_dev_attr_temp3_max.dev_attr.attr, |
555 | &sensor_dev_attr_temp3_fault.dev_attr.attr, |
556 | &sensor_dev_attr_temp3_min_alarm.dev_attr.attr, |
557 | &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, |
558 | NULL |
559 | }; |
560 | |
561 | /* extra temperature sensors only present on 2103-2 and 2103-4 in APD mode */ |
562 | static struct attribute *emc2103_attributes_temp4[] = { |
563 | &sensor_dev_attr_temp4_input.dev_attr.attr, |
564 | &sensor_dev_attr_temp4_min.dev_attr.attr, |
565 | &sensor_dev_attr_temp4_max.dev_attr.attr, |
566 | &sensor_dev_attr_temp4_fault.dev_attr.attr, |
567 | &sensor_dev_attr_temp4_min_alarm.dev_attr.attr, |
568 | &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, |
569 | NULL |
570 | }; |
571 | |
572 | static const struct attribute_group emc2103_group = { |
573 | .attrs = emc2103_attributes, |
574 | }; |
575 | |
576 | static const struct attribute_group emc2103_temp3_group = { |
577 | .attrs = emc2103_attributes_temp3, |
578 | }; |
579 | |
580 | static const struct attribute_group emc2103_temp4_group = { |
581 | .attrs = emc2103_attributes_temp4, |
582 | }; |
583 | |
584 | static int |
585 | emc2103_probe(struct i2c_client *client, const struct i2c_device_id *id) |
586 | { |
587 | struct emc2103_data *data; |
588 | int status; |
589 | |
590 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
591 | return -EIO; |
592 | |
593 | data = devm_kzalloc(&client->dev, sizeof(struct emc2103_data), |
594 | GFP_KERNEL); |
595 | if (!data) |
596 | return -ENOMEM; |
597 | |
598 | i2c_set_clientdata(client, data); |
599 | mutex_init(&data->update_lock); |
600 | |
601 | /* 2103-2 and 2103-4 have 3 external diodes, 2103-1 has 1 */ |
602 | status = i2c_smbus_read_byte_data(client, REG_PRODUCT_ID); |
603 | if (status == 0x24) { |
604 | /* 2103-1 only has 1 external diode */ |
605 | data->temp_count = 2; |
606 | } else { |
607 | /* 2103-2 and 2103-4 have 3 or 4 external diodes */ |
608 | status = i2c_smbus_read_byte_data(client, REG_CONF1); |
609 | if (status < 0) { |
610 | dev_dbg(&client->dev, "reg 0x%02x, err %d\n", REG_CONF1, |
611 | status); |
612 | return status; |
613 | } |
614 | |
615 | /* detect current state of hardware */ |
616 | data->temp_count = (status & 0x01) ? 4 : 3; |
617 | |
618 | /* force APD state if module parameter is set */ |
619 | if (apd == 0) { |
620 | /* force APD mode off */ |
621 | data->temp_count = 3; |
622 | status &= ~(0x01); |
623 | i2c_smbus_write_byte_data(client, REG_CONF1, status); |
624 | } else if (apd == 1) { |
625 | /* force APD mode on */ |
626 | data->temp_count = 4; |
627 | status |= 0x01; |
628 | i2c_smbus_write_byte_data(client, REG_CONF1, status); |
629 | } |
630 | } |
631 | |
632 | /* Register sysfs hooks */ |
633 | status = sysfs_create_group(&client->dev.kobj, &emc2103_group); |
634 | if (status) |
635 | return status; |
636 | |
637 | if (data->temp_count >= 3) { |
638 | status = sysfs_create_group(&client->dev.kobj, |
639 | &emc2103_temp3_group); |
640 | if (status) |
641 | goto exit_remove; |
642 | } |
643 | |
644 | if (data->temp_count == 4) { |
645 | status = sysfs_create_group(&client->dev.kobj, |
646 | &emc2103_temp4_group); |
647 | if (status) |
648 | goto exit_remove_temp3; |
649 | } |
650 | |
651 | data->hwmon_dev = hwmon_device_register(&client->dev); |
652 | if (IS_ERR(data->hwmon_dev)) { |
653 | status = PTR_ERR(data->hwmon_dev); |
654 | goto exit_remove_temp4; |
655 | } |
656 | |
657 | dev_info(&client->dev, "%s: sensor '%s'\n", |
658 | dev_name(data->hwmon_dev), client->name); |
659 | |
660 | return 0; |
661 | |
662 | exit_remove_temp4: |
663 | if (data->temp_count == 4) |
664 | sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group); |
665 | exit_remove_temp3: |
666 | if (data->temp_count >= 3) |
667 | sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group); |
668 | exit_remove: |
669 | sysfs_remove_group(&client->dev.kobj, &emc2103_group); |
670 | return status; |
671 | } |
672 | |
673 | static int emc2103_remove(struct i2c_client *client) |
674 | { |
675 | struct emc2103_data *data = i2c_get_clientdata(client); |
676 | |
677 | hwmon_device_unregister(data->hwmon_dev); |
678 | |
679 | if (data->temp_count == 4) |
680 | sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group); |
681 | |
682 | if (data->temp_count >= 3) |
683 | sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group); |
684 | |
685 | sysfs_remove_group(&client->dev.kobj, &emc2103_group); |
686 | |
687 | return 0; |
688 | } |
689 | |
690 | static const struct i2c_device_id emc2103_ids[] = { |
691 | { "emc2103", 0, }, |
692 | { /* LIST END */ } |
693 | }; |
694 | MODULE_DEVICE_TABLE(i2c, emc2103_ids); |
695 | |
696 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
697 | static int |
698 | emc2103_detect(struct i2c_client *new_client, struct i2c_board_info *info) |
699 | { |
700 | struct i2c_adapter *adapter = new_client->adapter; |
701 | int manufacturer, product; |
702 | |
703 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
704 | return -ENODEV; |
705 | |
706 | manufacturer = i2c_smbus_read_byte_data(new_client, REG_MFG_ID); |
707 | if (manufacturer != 0x5D) |
708 | return -ENODEV; |
709 | |
710 | product = i2c_smbus_read_byte_data(new_client, REG_PRODUCT_ID); |
711 | if ((product != 0x24) && (product != 0x26)) |
712 | return -ENODEV; |
713 | |
714 | strlcpy(info->type, "emc2103", I2C_NAME_SIZE); |
715 | |
716 | return 0; |
717 | } |
718 | |
719 | static struct i2c_driver emc2103_driver = { |
720 | .class = I2C_CLASS_HWMON, |
721 | .driver = { |
722 | .name = "emc2103", |
723 | }, |
724 | .probe = emc2103_probe, |
725 | .remove = emc2103_remove, |
726 | .id_table = emc2103_ids, |
727 | .detect = emc2103_detect, |
728 | .address_list = normal_i2c, |
729 | }; |
730 | |
731 | module_i2c_driver(emc2103_driver); |
732 | |
733 | MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>"); |
734 | MODULE_DESCRIPTION("SMSC EMC2103 hwmon driver"); |
735 | MODULE_LICENSE("GPL"); |
736 |
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