1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * lm87.c
4 *
5 * Copyright (C) 2000 Frodo Looijaard <frodol@dds.nl>
6 * Philip Edelbrock <phil@netroedge.com>
7 * Stephen Rousset <stephen.rousset@rocketlogix.com>
8 * Dan Eaton <dan.eaton@rocketlogix.com>
9 * Copyright (C) 2004-2008 Jean Delvare <jdelvare@suse.de>
10 *
11 * Original port to Linux 2.6 by Jeff Oliver.
12 *
13 * The LM87 is a sensor chip made by National Semiconductor. It monitors up
14 * to 8 voltages (including its own power source), up to three temperatures
15 * (its own plus up to two external ones) and up to two fans. The default
16 * configuration is 6 voltages, two temperatures and two fans (see below).
17 * Voltages are scaled internally with ratios such that the nominal value of
18 * each voltage correspond to a register value of 192 (which means a
19 * resolution of about 0.5% of the nominal value). Temperature values are
20 * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
21 * datasheet can be obtained from National's website at:
22 * http://www.national.com/pf/LM/LM87.html
23 *
24 * Some functions share pins, so not all functions are available at the same
25 * time. Which are depends on the hardware setup. This driver normally
26 * assumes that firmware configured the chip correctly. Where this is not
27 * the case, platform code must set the I2C client's platform_data to point
28 * to a u8 value to be written to the channel register.
29 * For reference, here is the list of exclusive functions:
30 * - in0+in5 (default) or temp3
31 * - fan1 (default) or in6
32 * - fan2 (default) or in7
33 * - VID lines (default) or IRQ lines (not handled by this driver)
34 *
35 * The LM87 additionally features an analog output, supposedly usable to
36 * control the speed of a fan. All new chips use pulse width modulation
37 * instead. The LM87 is the only hardware monitoring chipset I know of
38 * which uses amplitude modulation. Be careful when using this feature.
39 *
40 * This driver also supports the ADM1024, a sensor chip made by Analog
41 * Devices. That chip is fully compatible with the LM87. Complete
42 * datasheet can be obtained from Analog's website at:
43 * https://www.analog.com/en/prod/0,2877,ADM1024,00.html
44 */
45
46 #include <linux/module.h>
47 #include <linux/init.h>
48 #include <linux/slab.h>
49 #include <linux/jiffies.h>
50 #include <linux/i2c.h>
51 #include <linux/hwmon.h>
52 #include <linux/hwmon-sysfs.h>
53 #include <linux/hwmon-vid.h>
54 #include <linux/err.h>
55 #include <linux/mutex.h>
56 #include <linux/regulator/consumer.h>
57
58 /*
59 * Addresses to scan
60 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
61 */
62
63 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
64
65 /*
66 * The LM87 registers
67 */
68
69 /* nr in 0..5 */
70 #define LM87_REG_IN(nr) (0x20 + (nr))
71 #define LM87_REG_IN_MAX(nr) (0x2B + (nr) * 2)
72 #define LM87_REG_IN_MIN(nr) (0x2C + (nr) * 2)
73 /* nr in 0..1 */
74 #define LM87_REG_AIN(nr) (0x28 + (nr))
75 #define LM87_REG_AIN_MIN(nr) (0x1A + (nr))
76 #define LM87_REG_AIN_MAX(nr) (0x3B + (nr))
77
78 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
79 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
80 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
81
82 #define LM87_REG_TEMP_HW_INT_LOCK 0x13
83 #define LM87_REG_TEMP_HW_EXT_LOCK 0x14
84 #define LM87_REG_TEMP_HW_INT 0x17
85 #define LM87_REG_TEMP_HW_EXT 0x18
86
87 /* nr in 0..1 */
88 #define LM87_REG_FAN(nr) (0x28 + (nr))
89 #define LM87_REG_FAN_MIN(nr) (0x3B + (nr))
90 #define LM87_REG_AOUT 0x19
91
92 #define LM87_REG_CONFIG 0x40
93 #define LM87_REG_CHANNEL_MODE 0x16
94 #define LM87_REG_VID_FAN_DIV 0x47
95 #define LM87_REG_VID4 0x49
96
97 #define LM87_REG_ALARMS1 0x41
98 #define LM87_REG_ALARMS2 0x42
99
100 #define LM87_REG_COMPANY_ID 0x3E
101 #define LM87_REG_REVISION 0x3F
102
103 /*
104 * Conversions and various macros
105 * The LM87 uses signed 8-bit values for temperatures.
106 */
107
108 #define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
109 #define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \
110 (val) >= (scale) * 255 / 192 ? 255 : \
111 ((val) * 192 + (scale) / 2) / (scale))
112
113 #define TEMP_FROM_REG(reg) ((reg) * 1000)
114 #define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \
115 (val) >= 126500 ? 127 : \
116 (((val) < 0 ? (val) - 500 : \
117 (val) + 500) / 1000))
118
119 #define FAN_FROM_REG(reg, div) ((reg) == 255 || (reg) == 0 ? 0 : \
120 (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
121 #define FAN_TO_REG(val, div) ((val) * (div) * 255 <= 1350000 ? 255 : \
122 (1350000 + (val)*(div) / 2) / ((val) * (div)))
123
124 #define FAN_DIV_FROM_REG(reg) (1 << (reg))
125
126 /* analog out is 9.80mV/LSB */
127 #define AOUT_FROM_REG(reg) (((reg) * 98 + 5) / 10)
128 #define AOUT_TO_REG(val) ((val) <= 0 ? 0 : \
129 (val) >= 2500 ? 255 : \
130 ((val) * 10 + 49) / 98)
131
132 /* nr in 0..1 */
133 #define CHAN_NO_FAN(nr) (1 << (nr))
134 #define CHAN_TEMP3 (1 << 2)
135 #define CHAN_VCC_5V (1 << 3)
136 #define CHAN_NO_VID (1 << 7)
137
138 /*
139 * Client data (each client gets its own)
140 */
141
142 struct lm87_data {
143 struct mutex update_lock;
144 bool valid; /* false until following fields are valid */
145 unsigned long last_updated; /* In jiffies */
146
147 u8 channel; /* register value */
148 u8 config; /* original register value */
149
150 u8 in[8]; /* register value */
151 u8 in_max[8]; /* register value */
152 u8 in_min[8]; /* register value */
153 u16 in_scale[8];
154
155 s8 temp[3]; /* register value */
156 s8 temp_high[3]; /* register value */
157 s8 temp_low[3]; /* register value */
158 s8 temp_crit_int; /* min of two register values */
159 s8 temp_crit_ext; /* min of two register values */
160
161 u8 fan[2]; /* register value */
162 u8 fan_min[2]; /* register value */
163 u8 fan_div[2]; /* register value, shifted right */
164 u8 aout; /* register value */
165
166 u16 alarms; /* register values, combined */
167 u8 vid; /* register values, combined */
168 u8 vrm;
169
170 const struct attribute_group *attr_groups[6];
171 };
172
lm87_read_value(struct i2c_client * client,u8 reg)173 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
174 {
175 return i2c_smbus_read_byte_data(client, reg);
176 }
177
lm87_write_value(struct i2c_client * client,u8 reg,u8 value)178 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
179 {
180 return i2c_smbus_write_byte_data(client, reg, value);
181 }
182
lm87_update_device(struct device * dev)183 static struct lm87_data *lm87_update_device(struct device *dev)
184 {
185 struct i2c_client *client = dev_get_drvdata(dev);
186 struct lm87_data *data = i2c_get_clientdata(client);
187
188 mutex_lock(&data->update_lock);
189
190 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
191 int i, j;
192
193 dev_dbg(&client->dev, "Updating data.\n");
194
195 i = (data->channel & CHAN_TEMP3) ? 1 : 0;
196 j = (data->channel & CHAN_TEMP3) ? 5 : 6;
197 for (; i < j; i++) {
198 data->in[i] = lm87_read_value(client,
199 LM87_REG_IN(i));
200 data->in_min[i] = lm87_read_value(client,
201 LM87_REG_IN_MIN(i));
202 data->in_max[i] = lm87_read_value(client,
203 LM87_REG_IN_MAX(i));
204 }
205
206 for (i = 0; i < 2; i++) {
207 if (data->channel & CHAN_NO_FAN(i)) {
208 data->in[6+i] = lm87_read_value(client,
209 LM87_REG_AIN(i));
210 data->in_max[6+i] = lm87_read_value(client,
211 LM87_REG_AIN_MAX(i));
212 data->in_min[6+i] = lm87_read_value(client,
213 LM87_REG_AIN_MIN(i));
214
215 } else {
216 data->fan[i] = lm87_read_value(client,
217 LM87_REG_FAN(i));
218 data->fan_min[i] = lm87_read_value(client,
219 LM87_REG_FAN_MIN(i));
220 }
221 }
222
223 j = (data->channel & CHAN_TEMP3) ? 3 : 2;
224 for (i = 0 ; i < j; i++) {
225 data->temp[i] = lm87_read_value(client,
226 LM87_REG_TEMP[i]);
227 data->temp_high[i] = lm87_read_value(client,
228 LM87_REG_TEMP_HIGH[i]);
229 data->temp_low[i] = lm87_read_value(client,
230 LM87_REG_TEMP_LOW[i]);
231 }
232
233 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
234 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
235 data->temp_crit_int = min(i, j);
236
237 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
238 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
239 data->temp_crit_ext = min(i, j);
240
241 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
242 data->fan_div[0] = (i >> 4) & 0x03;
243 data->fan_div[1] = (i >> 6) & 0x03;
244 data->vid = (i & 0x0F)
245 | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
246 << 4;
247
248 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
249 | (lm87_read_value(client, LM87_REG_ALARMS2)
250 << 8);
251 data->aout = lm87_read_value(client, LM87_REG_AOUT);
252
253 data->last_updated = jiffies;
254 data->valid = true;
255 }
256
257 mutex_unlock(&data->update_lock);
258
259 return data;
260 }
261
262 /*
263 * Sysfs stuff
264 */
265
in_input_show(struct device * dev,struct device_attribute * attr,char * buf)266 static ssize_t in_input_show(struct device *dev,
267 struct device_attribute *attr, char *buf)
268 {
269 struct lm87_data *data = lm87_update_device(dev);
270 int nr = to_sensor_dev_attr(attr)->index;
271
272 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],
273 data->in_scale[nr]));
274 }
275
in_min_show(struct device * dev,struct device_attribute * attr,char * buf)276 static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,
277 char *buf)
278 {
279 struct lm87_data *data = lm87_update_device(dev);
280 int nr = to_sensor_dev_attr(attr)->index;
281
282 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],
283 data->in_scale[nr]));
284 }
285
in_max_show(struct device * dev,struct device_attribute * attr,char * buf)286 static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,
287 char *buf)
288 {
289 struct lm87_data *data = lm87_update_device(dev);
290 int nr = to_sensor_dev_attr(attr)->index;
291
292 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],
293 data->in_scale[nr]));
294 }
295
in_min_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)296 static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
297 const char *buf, size_t count)
298 {
299 struct i2c_client *client = dev_get_drvdata(dev);
300 struct lm87_data *data = i2c_get_clientdata(client);
301 int nr = to_sensor_dev_attr(attr)->index;
302 long val;
303 int err;
304
305 err = kstrtol(buf, 10, &val);
306 if (err)
307 return err;
308
309 mutex_lock(&data->update_lock);
310 data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
311 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
312 LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
313 mutex_unlock(&data->update_lock);
314 return count;
315 }
316
in_max_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)317 static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
318 const char *buf, size_t count)
319 {
320 struct i2c_client *client = dev_get_drvdata(dev);
321 struct lm87_data *data = i2c_get_clientdata(client);
322 int nr = to_sensor_dev_attr(attr)->index;
323 long val;
324 int err;
325
326 err = kstrtol(buf, 10, &val);
327 if (err)
328 return err;
329
330 mutex_lock(&data->update_lock);
331 data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
332 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
333 LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
334 mutex_unlock(&data->update_lock);
335 return count;
336 }
337
338 static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0);
339 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
340 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
341 static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1);
342 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
343 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
344 static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2);
345 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
346 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
347 static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3);
348 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
349 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
350 static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4);
351 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
352 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
353 static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5);
354 static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
355 static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
356 static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6);
357 static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
358 static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
359 static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7);
360 static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);
361 static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);
362
temp_input_show(struct device * dev,struct device_attribute * attr,char * buf)363 static ssize_t temp_input_show(struct device *dev,
364 struct device_attribute *attr, char *buf)
365 {
366 struct lm87_data *data = lm87_update_device(dev);
367 int nr = to_sensor_dev_attr(attr)->index;
368
369 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
370 }
371
temp_low_show(struct device * dev,struct device_attribute * attr,char * buf)372 static ssize_t temp_low_show(struct device *dev,
373 struct device_attribute *attr, char *buf)
374 {
375 struct lm87_data *data = lm87_update_device(dev);
376 int nr = to_sensor_dev_attr(attr)->index;
377
378 return sprintf(buf, "%d\n",
379 TEMP_FROM_REG(data->temp_low[nr]));
380 }
381
temp_high_show(struct device * dev,struct device_attribute * attr,char * buf)382 static ssize_t temp_high_show(struct device *dev,
383 struct device_attribute *attr, char *buf)
384 {
385 struct lm87_data *data = lm87_update_device(dev);
386 int nr = to_sensor_dev_attr(attr)->index;
387
388 return sprintf(buf, "%d\n",
389 TEMP_FROM_REG(data->temp_high[nr]));
390 }
391
temp_low_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)392 static ssize_t temp_low_store(struct device *dev,
393 struct device_attribute *attr, const char *buf,
394 size_t count)
395 {
396 struct i2c_client *client = dev_get_drvdata(dev);
397 struct lm87_data *data = i2c_get_clientdata(client);
398 int nr = to_sensor_dev_attr(attr)->index;
399 long val;
400 int err;
401
402 err = kstrtol(buf, 10, &val);
403 if (err)
404 return err;
405
406 mutex_lock(&data->update_lock);
407 data->temp_low[nr] = TEMP_TO_REG(val);
408 lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
409 mutex_unlock(&data->update_lock);
410 return count;
411 }
412
temp_high_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)413 static ssize_t temp_high_store(struct device *dev,
414 struct device_attribute *attr, const char *buf,
415 size_t count)
416 {
417 struct i2c_client *client = dev_get_drvdata(dev);
418 struct lm87_data *data = i2c_get_clientdata(client);
419 int nr = to_sensor_dev_attr(attr)->index;
420 long val;
421 int err;
422
423 err = kstrtol(buf, 10, &val);
424 if (err)
425 return err;
426
427 mutex_lock(&data->update_lock);
428 data->temp_high[nr] = TEMP_TO_REG(val);
429 lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
430 mutex_unlock(&data->update_lock);
431 return count;
432 }
433
434 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
435 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0);
436 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0);
437 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
438 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1);
439 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1);
440 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
441 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2);
442 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2);
443
temp1_crit_show(struct device * dev,struct device_attribute * attr,char * buf)444 static ssize_t temp1_crit_show(struct device *dev,
445 struct device_attribute *attr, char *buf)
446 {
447 struct lm87_data *data = lm87_update_device(dev);
448 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
449 }
450
temp2_crit_show(struct device * dev,struct device_attribute * attr,char * buf)451 static ssize_t temp2_crit_show(struct device *dev,
452 struct device_attribute *attr, char *buf)
453 {
454 struct lm87_data *data = lm87_update_device(dev);
455 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
456 }
457
458 static DEVICE_ATTR_RO(temp1_crit);
459 static DEVICE_ATTR_RO(temp2_crit);
460 static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL);
461
fan_input_show(struct device * dev,struct device_attribute * attr,char * buf)462 static ssize_t fan_input_show(struct device *dev,
463 struct device_attribute *attr, char *buf)
464 {
465 struct lm87_data *data = lm87_update_device(dev);
466 int nr = to_sensor_dev_attr(attr)->index;
467
468 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
469 FAN_DIV_FROM_REG(data->fan_div[nr])));
470 }
471
fan_min_show(struct device * dev,struct device_attribute * attr,char * buf)472 static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
473 char *buf)
474 {
475 struct lm87_data *data = lm87_update_device(dev);
476 int nr = to_sensor_dev_attr(attr)->index;
477
478 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
479 FAN_DIV_FROM_REG(data->fan_div[nr])));
480 }
481
fan_div_show(struct device * dev,struct device_attribute * attr,char * buf)482 static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
483 char *buf)
484 {
485 struct lm87_data *data = lm87_update_device(dev);
486 int nr = to_sensor_dev_attr(attr)->index;
487
488 return sprintf(buf, "%d\n",
489 FAN_DIV_FROM_REG(data->fan_div[nr]));
490 }
491
fan_min_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)492 static ssize_t fan_min_store(struct device *dev,
493 struct device_attribute *attr, const char *buf,
494 size_t count)
495 {
496 struct i2c_client *client = dev_get_drvdata(dev);
497 struct lm87_data *data = i2c_get_clientdata(client);
498 int nr = to_sensor_dev_attr(attr)->index;
499 long val;
500 int err;
501
502 err = kstrtol(buf, 10, &val);
503 if (err)
504 return err;
505
506 mutex_lock(&data->update_lock);
507 data->fan_min[nr] = FAN_TO_REG(val,
508 FAN_DIV_FROM_REG(data->fan_div[nr]));
509 lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
510 mutex_unlock(&data->update_lock);
511 return count;
512 }
513
514 /*
515 * Note: we save and restore the fan minimum here, because its value is
516 * determined in part by the fan clock divider. This follows the principle
517 * of least surprise; the user doesn't expect the fan minimum to change just
518 * because the divider changed.
519 */
fan_div_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)520 static ssize_t fan_div_store(struct device *dev,
521 struct device_attribute *attr, const char *buf,
522 size_t count)
523 {
524 struct i2c_client *client = dev_get_drvdata(dev);
525 struct lm87_data *data = i2c_get_clientdata(client);
526 int nr = to_sensor_dev_attr(attr)->index;
527 long val;
528 int err;
529 unsigned long min;
530 u8 reg;
531
532 err = kstrtol(buf, 10, &val);
533 if (err)
534 return err;
535
536 mutex_lock(&data->update_lock);
537 min = FAN_FROM_REG(data->fan_min[nr],
538 FAN_DIV_FROM_REG(data->fan_div[nr]));
539
540 switch (val) {
541 case 1:
542 data->fan_div[nr] = 0;
543 break;
544 case 2:
545 data->fan_div[nr] = 1;
546 break;
547 case 4:
548 data->fan_div[nr] = 2;
549 break;
550 case 8:
551 data->fan_div[nr] = 3;
552 break;
553 default:
554 mutex_unlock(&data->update_lock);
555 return -EINVAL;
556 }
557
558 reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
559 switch (nr) {
560 case 0:
561 reg = (reg & 0xCF) | (data->fan_div[0] << 4);
562 break;
563 case 1:
564 reg = (reg & 0x3F) | (data->fan_div[1] << 6);
565 break;
566 }
567 lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
568
569 data->fan_min[nr] = FAN_TO_REG(min, val);
570 lm87_write_value(client, LM87_REG_FAN_MIN(nr),
571 data->fan_min[nr]);
572 mutex_unlock(&data->update_lock);
573
574 return count;
575 }
576
577 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
578 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
579 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
580 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
581 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
582 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
583
alarms_show(struct device * dev,struct device_attribute * attr,char * buf)584 static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
585 char *buf)
586 {
587 struct lm87_data *data = lm87_update_device(dev);
588 return sprintf(buf, "%d\n", data->alarms);
589 }
590 static DEVICE_ATTR_RO(alarms);
591
cpu0_vid_show(struct device * dev,struct device_attribute * attr,char * buf)592 static ssize_t cpu0_vid_show(struct device *dev,
593 struct device_attribute *attr, char *buf)
594 {
595 struct lm87_data *data = lm87_update_device(dev);
596 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
597 }
598 static DEVICE_ATTR_RO(cpu0_vid);
599
vrm_show(struct device * dev,struct device_attribute * attr,char * buf)600 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
601 char *buf)
602 {
603 struct lm87_data *data = dev_get_drvdata(dev);
604 return sprintf(buf, "%d\n", data->vrm);
605 }
vrm_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)606 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
607 const char *buf, size_t count)
608 {
609 struct lm87_data *data = dev_get_drvdata(dev);
610 unsigned long val;
611 int err;
612
613 err = kstrtoul(buf, 10, &val);
614 if (err)
615 return err;
616
617 if (val > 255)
618 return -EINVAL;
619
620 data->vrm = val;
621 return count;
622 }
623 static DEVICE_ATTR_RW(vrm);
624
aout_output_show(struct device * dev,struct device_attribute * attr,char * buf)625 static ssize_t aout_output_show(struct device *dev,
626 struct device_attribute *attr, char *buf)
627 {
628 struct lm87_data *data = lm87_update_device(dev);
629 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
630 }
aout_output_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)631 static ssize_t aout_output_store(struct device *dev,
632 struct device_attribute *attr,
633 const char *buf, size_t count)
634 {
635 struct i2c_client *client = dev_get_drvdata(dev);
636 struct lm87_data *data = i2c_get_clientdata(client);
637 long val;
638 int err;
639
640 err = kstrtol(buf, 10, &val);
641 if (err)
642 return err;
643
644 mutex_lock(&data->update_lock);
645 data->aout = AOUT_TO_REG(val);
646 lm87_write_value(client, LM87_REG_AOUT, data->aout);
647 mutex_unlock(&data->update_lock);
648 return count;
649 }
650 static DEVICE_ATTR_RW(aout_output);
651
alarm_show(struct device * dev,struct device_attribute * attr,char * buf)652 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
653 char *buf)
654 {
655 struct lm87_data *data = lm87_update_device(dev);
656 int bitnr = to_sensor_dev_attr(attr)->index;
657 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
658 }
659 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
660 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
661 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
662 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
663 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
664 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
665 static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);
666 static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7);
667 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
668 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);
669 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5);
670 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
671 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
672 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14);
673 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15);
674
675 /*
676 * Real code
677 */
678
679 static struct attribute *lm87_attributes[] = {
680 &sensor_dev_attr_in1_input.dev_attr.attr,
681 &sensor_dev_attr_in1_min.dev_attr.attr,
682 &sensor_dev_attr_in1_max.dev_attr.attr,
683 &sensor_dev_attr_in1_alarm.dev_attr.attr,
684 &sensor_dev_attr_in2_input.dev_attr.attr,
685 &sensor_dev_attr_in2_min.dev_attr.attr,
686 &sensor_dev_attr_in2_max.dev_attr.attr,
687 &sensor_dev_attr_in2_alarm.dev_attr.attr,
688 &sensor_dev_attr_in3_input.dev_attr.attr,
689 &sensor_dev_attr_in3_min.dev_attr.attr,
690 &sensor_dev_attr_in3_max.dev_attr.attr,
691 &sensor_dev_attr_in3_alarm.dev_attr.attr,
692 &sensor_dev_attr_in4_input.dev_attr.attr,
693 &sensor_dev_attr_in4_min.dev_attr.attr,
694 &sensor_dev_attr_in4_max.dev_attr.attr,
695 &sensor_dev_attr_in4_alarm.dev_attr.attr,
696
697 &sensor_dev_attr_temp1_input.dev_attr.attr,
698 &sensor_dev_attr_temp1_max.dev_attr.attr,
699 &sensor_dev_attr_temp1_min.dev_attr.attr,
700 &dev_attr_temp1_crit.attr,
701 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
702 &sensor_dev_attr_temp2_input.dev_attr.attr,
703 &sensor_dev_attr_temp2_max.dev_attr.attr,
704 &sensor_dev_attr_temp2_min.dev_attr.attr,
705 &dev_attr_temp2_crit.attr,
706 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
707 &sensor_dev_attr_temp2_fault.dev_attr.attr,
708
709 &dev_attr_alarms.attr,
710 &dev_attr_aout_output.attr,
711
712 NULL
713 };
714
715 static const struct attribute_group lm87_group = {
716 .attrs = lm87_attributes,
717 };
718
719 static struct attribute *lm87_attributes_in6[] = {
720 &sensor_dev_attr_in6_input.dev_attr.attr,
721 &sensor_dev_attr_in6_min.dev_attr.attr,
722 &sensor_dev_attr_in6_max.dev_attr.attr,
723 &sensor_dev_attr_in6_alarm.dev_attr.attr,
724 NULL
725 };
726
727 static const struct attribute_group lm87_group_in6 = {
728 .attrs = lm87_attributes_in6,
729 };
730
731 static struct attribute *lm87_attributes_fan1[] = {
732 &sensor_dev_attr_fan1_input.dev_attr.attr,
733 &sensor_dev_attr_fan1_min.dev_attr.attr,
734 &sensor_dev_attr_fan1_div.dev_attr.attr,
735 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
736 NULL
737 };
738
739 static const struct attribute_group lm87_group_fan1 = {
740 .attrs = lm87_attributes_fan1,
741 };
742
743 static struct attribute *lm87_attributes_in7[] = {
744 &sensor_dev_attr_in7_input.dev_attr.attr,
745 &sensor_dev_attr_in7_min.dev_attr.attr,
746 &sensor_dev_attr_in7_max.dev_attr.attr,
747 &sensor_dev_attr_in7_alarm.dev_attr.attr,
748 NULL
749 };
750
751 static const struct attribute_group lm87_group_in7 = {
752 .attrs = lm87_attributes_in7,
753 };
754
755 static struct attribute *lm87_attributes_fan2[] = {
756 &sensor_dev_attr_fan2_input.dev_attr.attr,
757 &sensor_dev_attr_fan2_min.dev_attr.attr,
758 &sensor_dev_attr_fan2_div.dev_attr.attr,
759 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
760 NULL
761 };
762
763 static const struct attribute_group lm87_group_fan2 = {
764 .attrs = lm87_attributes_fan2,
765 };
766
767 static struct attribute *lm87_attributes_temp3[] = {
768 &sensor_dev_attr_temp3_input.dev_attr.attr,
769 &sensor_dev_attr_temp3_max.dev_attr.attr,
770 &sensor_dev_attr_temp3_min.dev_attr.attr,
771 &dev_attr_temp3_crit.attr,
772 &sensor_dev_attr_temp3_alarm.dev_attr.attr,
773 &sensor_dev_attr_temp3_fault.dev_attr.attr,
774 NULL
775 };
776
777 static const struct attribute_group lm87_group_temp3 = {
778 .attrs = lm87_attributes_temp3,
779 };
780
781 static struct attribute *lm87_attributes_in0_5[] = {
782 &sensor_dev_attr_in0_input.dev_attr.attr,
783 &sensor_dev_attr_in0_min.dev_attr.attr,
784 &sensor_dev_attr_in0_max.dev_attr.attr,
785 &sensor_dev_attr_in0_alarm.dev_attr.attr,
786 &sensor_dev_attr_in5_input.dev_attr.attr,
787 &sensor_dev_attr_in5_min.dev_attr.attr,
788 &sensor_dev_attr_in5_max.dev_attr.attr,
789 &sensor_dev_attr_in5_alarm.dev_attr.attr,
790 NULL
791 };
792
793 static const struct attribute_group lm87_group_in0_5 = {
794 .attrs = lm87_attributes_in0_5,
795 };
796
797 static struct attribute *lm87_attributes_vid[] = {
798 &dev_attr_cpu0_vid.attr,
799 &dev_attr_vrm.attr,
800 NULL
801 };
802
803 static const struct attribute_group lm87_group_vid = {
804 .attrs = lm87_attributes_vid,
805 };
806
807 /* Return 0 if detection is successful, -ENODEV otherwise */
lm87_detect(struct i2c_client * client,struct i2c_board_info * info)808 static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
809 {
810 struct i2c_adapter *adapter = client->adapter;
811 const char *name;
812 u8 cid, rev;
813
814 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
815 return -ENODEV;
816
817 if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
818 return -ENODEV;
819
820 /* Now, we do the remaining detection. */
821 cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
822 rev = lm87_read_value(client, LM87_REG_REVISION);
823
824 if (cid == 0x02 /* National Semiconductor */
825 && (rev >= 0x01 && rev <= 0x08))
826 name = "lm87";
827 else if (cid == 0x41 /* Analog Devices */
828 && (rev & 0xf0) == 0x10)
829 name = "adm1024";
830 else {
831 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
832 client->addr);
833 return -ENODEV;
834 }
835
836 strscpy(info->type, name, I2C_NAME_SIZE);
837
838 return 0;
839 }
840
lm87_restore_config(void * arg)841 static void lm87_restore_config(void *arg)
842 {
843 struct i2c_client *client = arg;
844 struct lm87_data *data = i2c_get_clientdata(client);
845
846 lm87_write_value(client, LM87_REG_CONFIG, data->config);
847 }
848
lm87_init_client(struct i2c_client * client)849 static int lm87_init_client(struct i2c_client *client)
850 {
851 struct lm87_data *data = i2c_get_clientdata(client);
852 int rc;
853 struct device_node *of_node = client->dev.of_node;
854 u8 val = 0;
855 struct regulator *vcc = NULL;
856
857 if (of_node) {
858 if (of_property_read_bool(of_node, "has-temp3"))
859 val |= CHAN_TEMP3;
860 if (of_property_read_bool(of_node, "has-in6"))
861 val |= CHAN_NO_FAN(0);
862 if (of_property_read_bool(of_node, "has-in7"))
863 val |= CHAN_NO_FAN(1);
864 vcc = devm_regulator_get_optional(&client->dev, "vcc");
865 if (!IS_ERR(vcc)) {
866 if (regulator_get_voltage(vcc) == 5000000)
867 val |= CHAN_VCC_5V;
868 }
869 data->channel = val;
870 lm87_write_value(client,
871 LM87_REG_CHANNEL_MODE, data->channel);
872 } else if (dev_get_platdata(&client->dev)) {
873 data->channel = *(u8 *)dev_get_platdata(&client->dev);
874 lm87_write_value(client,
875 LM87_REG_CHANNEL_MODE, data->channel);
876 } else {
877 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
878 }
879 data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
880
881 rc = devm_add_action(&client->dev, lm87_restore_config, client);
882 if (rc)
883 return rc;
884
885 if (!(data->config & 0x01)) {
886 int i;
887
888 /* Limits are left uninitialized after power-up */
889 for (i = 1; i < 6; i++) {
890 lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
891 lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
892 }
893 for (i = 0; i < 2; i++) {
894 lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
895 lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
896 lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
897 lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
898 }
899 if (data->channel & CHAN_TEMP3) {
900 lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
901 lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
902 } else {
903 lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
904 lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
905 }
906 }
907
908 /* Make sure Start is set and INT#_Clear is clear */
909 if ((data->config & 0x09) != 0x01)
910 lm87_write_value(client, LM87_REG_CONFIG,
911 (data->config & 0x77) | 0x01);
912 return 0;
913 }
914
lm87_probe(struct i2c_client * client)915 static int lm87_probe(struct i2c_client *client)
916 {
917 struct lm87_data *data;
918 struct device *hwmon_dev;
919 int err;
920 unsigned int group_tail = 0;
921
922 data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
923 if (!data)
924 return -ENOMEM;
925
926 i2c_set_clientdata(client, data);
927 mutex_init(&data->update_lock);
928
929 /* Initialize the LM87 chip */
930 err = lm87_init_client(client);
931 if (err)
932 return err;
933
934 data->in_scale[0] = 2500;
935 data->in_scale[1] = 2700;
936 data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
937 data->in_scale[3] = 5000;
938 data->in_scale[4] = 12000;
939 data->in_scale[5] = 2700;
940 data->in_scale[6] = 1875;
941 data->in_scale[7] = 1875;
942
943 /*
944 * Construct the list of attributes, the list depends on the
945 * configuration of the chip
946 */
947 data->attr_groups[group_tail++] = &lm87_group;
948 if (data->channel & CHAN_NO_FAN(0))
949 data->attr_groups[group_tail++] = &lm87_group_in6;
950 else
951 data->attr_groups[group_tail++] = &lm87_group_fan1;
952
953 if (data->channel & CHAN_NO_FAN(1))
954 data->attr_groups[group_tail++] = &lm87_group_in7;
955 else
956 data->attr_groups[group_tail++] = &lm87_group_fan2;
957
958 if (data->channel & CHAN_TEMP3)
959 data->attr_groups[group_tail++] = &lm87_group_temp3;
960 else
961 data->attr_groups[group_tail++] = &lm87_group_in0_5;
962
963 if (!(data->channel & CHAN_NO_VID)) {
964 data->vrm = vid_which_vrm();
965 data->attr_groups[group_tail++] = &lm87_group_vid;
966 }
967
968 hwmon_dev = devm_hwmon_device_register_with_groups(
969 &client->dev, client->name, client, data->attr_groups);
970 return PTR_ERR_OR_ZERO(hwmon_dev);
971 }
972
973 /*
974 * Driver data (common to all clients)
975 */
976
977 static const struct i2c_device_id lm87_id[] = {
978 { "lm87", 0 },
979 { "adm1024", 0 },
980 { }
981 };
982 MODULE_DEVICE_TABLE(i2c, lm87_id);
983
984 static const struct of_device_id lm87_of_match[] = {
985 { .compatible = "ti,lm87" },
986 { .compatible = "adi,adm1024" },
987 { },
988 };
989 MODULE_DEVICE_TABLE(of, lm87_of_match);
990
991 static struct i2c_driver lm87_driver = {
992 .class = I2C_CLASS_HWMON,
993 .driver = {
994 .name = "lm87",
995 .of_match_table = lm87_of_match,
996 },
997 .probe = lm87_probe,
998 .id_table = lm87_id,
999 .detect = lm87_detect,
1000 .address_list = normal_i2c,
1001 };
1002
1003 module_i2c_driver(lm87_driver);
1004
1005 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");
1006 MODULE_DESCRIPTION("LM87 driver");
1007 MODULE_LICENSE("GPL");
1008