Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
[sfrench/cifs-2.6.git] / drivers / hwmon / lm87.c
1 /*
2  * lm87.c
3  *
4  * Copyright (C) 2000       Frodo Looijaard <frodol@dds.nl>
5  *                          Philip Edelbrock <phil@netroedge.com>
6  *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
7  *                          Dan Eaton <dan.eaton@rocketlogix.com>
8  * Copyright (C) 2004-2008  Jean Delvare <jdelvare@suse.de>
9  *
10  * Original port to Linux 2.6 by Jeff Oliver.
11  *
12  * The LM87 is a sensor chip made by National Semiconductor. It monitors up
13  * to 8 voltages (including its own power source), up to three temperatures
14  * (its own plus up to two external ones) and up to two fans. The default
15  * configuration is 6 voltages, two temperatures and two fans (see below).
16  * Voltages are scaled internally with ratios such that the nominal value of
17  * each voltage correspond to a register value of 192 (which means a
18  * resolution of about 0.5% of the nominal value). Temperature values are
19  * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
20  * datasheet can be obtained from National's website at:
21  *   http://www.national.com/pf/LM/LM87.html
22  *
23  * Some functions share pins, so not all functions are available at the same
24  * time. Which are depends on the hardware setup. This driver normally
25  * assumes that firmware configured the chip correctly. Where this is not
26  * the case, platform code must set the I2C client's platform_data to point
27  * to a u8 value to be written to the channel register.
28  * For reference, here is the list of exclusive functions:
29  *  - in0+in5 (default) or temp3
30  *  - fan1 (default) or in6
31  *  - fan2 (default) or in7
32  *  - VID lines (default) or IRQ lines (not handled by this driver)
33  *
34  * The LM87 additionally features an analog output, supposedly usable to
35  * control the speed of a fan. All new chips use pulse width modulation
36  * instead. The LM87 is the only hardware monitoring chipset I know of
37  * which uses amplitude modulation. Be careful when using this feature.
38  *
39  * This driver also supports the ADM1024, a sensor chip made by Analog
40  * Devices. That chip is fully compatible with the LM87. Complete
41  * datasheet can be obtained from Analog's website at:
42  *   http://www.analog.com/en/prod/0,2877,ADM1024,00.html
43  *
44  * This program is free software; you can redistribute it and/or modify
45  * it under the terms of the GNU General Public License as published by
46  * the Free Software Foundation; either version 2 of the License, or
47  * (at your option) any later version.
48  *
49  * This program is distributed in the hope that it will be useful,
50  * but WITHOUT ANY WARRANTY; without even the implied warranty of
51  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
52  * GNU General Public License for more details.
53  *
54  * You should have received a copy of the GNU General Public License
55  * along with this program; if not, write to the Free Software
56  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
57  */
58
59 #include <linux/module.h>
60 #include <linux/init.h>
61 #include <linux/slab.h>
62 #include <linux/jiffies.h>
63 #include <linux/i2c.h>
64 #include <linux/hwmon.h>
65 #include <linux/hwmon-sysfs.h>
66 #include <linux/hwmon-vid.h>
67 #include <linux/err.h>
68 #include <linux/mutex.h>
69 #include <linux/regulator/consumer.h>
70
71 /*
72  * Addresses to scan
73  * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
74  */
75
76 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
77
78 /*
79  * The LM87 registers
80  */
81
82 /* nr in 0..5 */
83 #define LM87_REG_IN(nr)                 (0x20 + (nr))
84 #define LM87_REG_IN_MAX(nr)             (0x2B + (nr) * 2)
85 #define LM87_REG_IN_MIN(nr)             (0x2C + (nr) * 2)
86 /* nr in 0..1 */
87 #define LM87_REG_AIN(nr)                (0x28 + (nr))
88 #define LM87_REG_AIN_MIN(nr)            (0x1A + (nr))
89 #define LM87_REG_AIN_MAX(nr)            (0x3B + (nr))
90
91 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
92 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
93 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
94
95 #define LM87_REG_TEMP_HW_INT_LOCK       0x13
96 #define LM87_REG_TEMP_HW_EXT_LOCK       0x14
97 #define LM87_REG_TEMP_HW_INT            0x17
98 #define LM87_REG_TEMP_HW_EXT            0x18
99
100 /* nr in 0..1 */
101 #define LM87_REG_FAN(nr)                (0x28 + (nr))
102 #define LM87_REG_FAN_MIN(nr)            (0x3B + (nr))
103 #define LM87_REG_AOUT                   0x19
104
105 #define LM87_REG_CONFIG                 0x40
106 #define LM87_REG_CHANNEL_MODE           0x16
107 #define LM87_REG_VID_FAN_DIV            0x47
108 #define LM87_REG_VID4                   0x49
109
110 #define LM87_REG_ALARMS1                0x41
111 #define LM87_REG_ALARMS2                0x42
112
113 #define LM87_REG_COMPANY_ID             0x3E
114 #define LM87_REG_REVISION               0x3F
115
116 /*
117  * Conversions and various macros
118  * The LM87 uses signed 8-bit values for temperatures.
119  */
120
121 #define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
122 #define IN_TO_REG(val, scale)   ((val) <= 0 ? 0 : \
123                                  (val) >= (scale) * 255 / 192 ? 255 : \
124                                  ((val) * 192 + (scale) / 2) / (scale))
125
126 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
127 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
128                                  (val) >= 126500 ? 127 : \
129                                  (((val) < 0 ? (val) - 500 : \
130                                    (val) + 500) / 1000))
131
132 #define FAN_FROM_REG(reg, div)  ((reg) == 255 || (reg) == 0 ? 0 : \
133                                  (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
134 #define FAN_TO_REG(val, div)    ((val) * (div) * 255 <= 1350000 ? 255 : \
135                                  (1350000 + (val)*(div) / 2) / ((val) * (div)))
136
137 #define FAN_DIV_FROM_REG(reg)   (1 << (reg))
138
139 /* analog out is 9.80mV/LSB */
140 #define AOUT_FROM_REG(reg)      (((reg) * 98 + 5) / 10)
141 #define AOUT_TO_REG(val)        ((val) <= 0 ? 0 : \
142                                  (val) >= 2500 ? 255 : \
143                                  ((val) * 10 + 49) / 98)
144
145 /* nr in 0..1 */
146 #define CHAN_NO_FAN(nr)         (1 << (nr))
147 #define CHAN_TEMP3              (1 << 2)
148 #define CHAN_VCC_5V             (1 << 3)
149 #define CHAN_NO_VID             (1 << 7)
150
151 /*
152  * Client data (each client gets its own)
153  */
154
155 struct lm87_data {
156         struct mutex update_lock;
157         char valid; /* zero until following fields are valid */
158         unsigned long last_updated; /* In jiffies */
159
160         u8 channel;             /* register value */
161         u8 config;              /* original register value */
162
163         u8 in[8];               /* register value */
164         u8 in_max[8];           /* register value */
165         u8 in_min[8];           /* register value */
166         u16 in_scale[8];
167
168         s8 temp[3];             /* register value */
169         s8 temp_high[3];        /* register value */
170         s8 temp_low[3];         /* register value */
171         s8 temp_crit_int;       /* min of two register values */
172         s8 temp_crit_ext;       /* min of two register values */
173
174         u8 fan[2];              /* register value */
175         u8 fan_min[2];          /* register value */
176         u8 fan_div[2];          /* register value, shifted right */
177         u8 aout;                /* register value */
178
179         u16 alarms;             /* register values, combined */
180         u8 vid;                 /* register values, combined */
181         u8 vrm;
182
183         const struct attribute_group *attr_groups[6];
184 };
185
186 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
187 {
188         return i2c_smbus_read_byte_data(client, reg);
189 }
190
191 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
192 {
193         return i2c_smbus_write_byte_data(client, reg, value);
194 }
195
196 static struct lm87_data *lm87_update_device(struct device *dev)
197 {
198         struct i2c_client *client = dev_get_drvdata(dev);
199         struct lm87_data *data = i2c_get_clientdata(client);
200
201         mutex_lock(&data->update_lock);
202
203         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
204                 int i, j;
205
206                 dev_dbg(&client->dev, "Updating data.\n");
207
208                 i = (data->channel & CHAN_TEMP3) ? 1 : 0;
209                 j = (data->channel & CHAN_TEMP3) ? 5 : 6;
210                 for (; i < j; i++) {
211                         data->in[i] = lm87_read_value(client,
212                                       LM87_REG_IN(i));
213                         data->in_min[i] = lm87_read_value(client,
214                                           LM87_REG_IN_MIN(i));
215                         data->in_max[i] = lm87_read_value(client,
216                                           LM87_REG_IN_MAX(i));
217                 }
218
219                 for (i = 0; i < 2; i++) {
220                         if (data->channel & CHAN_NO_FAN(i)) {
221                                 data->in[6+i] = lm87_read_value(client,
222                                                 LM87_REG_AIN(i));
223                                 data->in_max[6+i] = lm87_read_value(client,
224                                                     LM87_REG_AIN_MAX(i));
225                                 data->in_min[6+i] = lm87_read_value(client,
226                                                     LM87_REG_AIN_MIN(i));
227
228                         } else {
229                                 data->fan[i] = lm87_read_value(client,
230                                                LM87_REG_FAN(i));
231                                 data->fan_min[i] = lm87_read_value(client,
232                                                    LM87_REG_FAN_MIN(i));
233                         }
234                 }
235
236                 j = (data->channel & CHAN_TEMP3) ? 3 : 2;
237                 for (i = 0 ; i < j; i++) {
238                         data->temp[i] = lm87_read_value(client,
239                                         LM87_REG_TEMP[i]);
240                         data->temp_high[i] = lm87_read_value(client,
241                                              LM87_REG_TEMP_HIGH[i]);
242                         data->temp_low[i] = lm87_read_value(client,
243                                             LM87_REG_TEMP_LOW[i]);
244                 }
245
246                 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
247                 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
248                 data->temp_crit_int = min(i, j);
249
250                 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
251                 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
252                 data->temp_crit_ext = min(i, j);
253
254                 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
255                 data->fan_div[0] = (i >> 4) & 0x03;
256                 data->fan_div[1] = (i >> 6) & 0x03;
257                 data->vid = (i & 0x0F)
258                           | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
259                              << 4;
260
261                 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
262                              | (lm87_read_value(client, LM87_REG_ALARMS2)
263                                 << 8);
264                 data->aout = lm87_read_value(client, LM87_REG_AOUT);
265
266                 data->last_updated = jiffies;
267                 data->valid = 1;
268         }
269
270         mutex_unlock(&data->update_lock);
271
272         return data;
273 }
274
275 /*
276  * Sysfs stuff
277  */
278
279 static ssize_t in_input_show(struct device *dev,
280                              struct device_attribute *attr, char *buf)
281 {
282         struct lm87_data *data = lm87_update_device(dev);
283         int nr = to_sensor_dev_attr(attr)->index;
284
285         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],
286                        data->in_scale[nr]));
287 }
288
289 static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,
290                            char *buf)
291 {
292         struct lm87_data *data = lm87_update_device(dev);
293         int nr = to_sensor_dev_attr(attr)->index;
294
295         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],
296                        data->in_scale[nr]));
297 }
298
299 static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,
300                            char *buf)
301 {
302         struct lm87_data *data = lm87_update_device(dev);
303         int nr = to_sensor_dev_attr(attr)->index;
304
305         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],
306                        data->in_scale[nr]));
307 }
308
309 static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
310                             const char *buf, size_t count)
311 {
312         struct i2c_client *client = dev_get_drvdata(dev);
313         struct lm87_data *data = i2c_get_clientdata(client);
314         int nr = to_sensor_dev_attr(attr)->index;
315         long val;
316         int err;
317
318         err = kstrtol(buf, 10, &val);
319         if (err)
320                 return err;
321
322         mutex_lock(&data->update_lock);
323         data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
324         lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
325                          LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
326         mutex_unlock(&data->update_lock);
327         return count;
328 }
329
330 static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
331                             const char *buf, size_t count)
332 {
333         struct i2c_client *client = dev_get_drvdata(dev);
334         struct lm87_data *data = i2c_get_clientdata(client);
335         int nr = to_sensor_dev_attr(attr)->index;
336         long val;
337         int err;
338
339         err = kstrtol(buf, 10, &val);
340         if (err)
341                 return err;
342
343         mutex_lock(&data->update_lock);
344         data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
345         lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
346                          LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
347         mutex_unlock(&data->update_lock);
348         return count;
349 }
350
351 static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0);
352 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
353 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
354 static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1);
355 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
356 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
357 static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2);
358 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
359 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
360 static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3);
361 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
362 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
363 static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4);
364 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
365 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
366 static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5);
367 static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
368 static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
369 static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6);
370 static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
371 static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
372 static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7);
373 static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);
374 static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);
375
376 static ssize_t temp_input_show(struct device *dev,
377                                struct device_attribute *attr, char *buf)
378 {
379         struct lm87_data *data = lm87_update_device(dev);
380         int nr = to_sensor_dev_attr(attr)->index;
381
382         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
383 }
384
385 static ssize_t temp_low_show(struct device *dev,
386                              struct device_attribute *attr, char *buf)
387 {
388         struct lm87_data *data = lm87_update_device(dev);
389         int nr = to_sensor_dev_attr(attr)->index;
390
391         return sprintf(buf, "%d\n",
392                        TEMP_FROM_REG(data->temp_low[nr]));
393 }
394
395 static ssize_t temp_high_show(struct device *dev,
396                               struct device_attribute *attr, char *buf)
397 {
398         struct lm87_data *data = lm87_update_device(dev);
399         int nr = to_sensor_dev_attr(attr)->index;
400
401         return sprintf(buf, "%d\n",
402                        TEMP_FROM_REG(data->temp_high[nr]));
403 }
404
405 static ssize_t temp_low_store(struct device *dev,
406                               struct device_attribute *attr, const char *buf,
407                               size_t count)
408 {
409         struct i2c_client *client = dev_get_drvdata(dev);
410         struct lm87_data *data = i2c_get_clientdata(client);
411         int nr = to_sensor_dev_attr(attr)->index;
412         long val;
413         int err;
414
415         err = kstrtol(buf, 10, &val);
416         if (err)
417                 return err;
418
419         mutex_lock(&data->update_lock);
420         data->temp_low[nr] = TEMP_TO_REG(val);
421         lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
422         mutex_unlock(&data->update_lock);
423         return count;
424 }
425
426 static ssize_t temp_high_store(struct device *dev,
427                                struct device_attribute *attr, const char *buf,
428                                size_t count)
429 {
430         struct i2c_client *client = dev_get_drvdata(dev);
431         struct lm87_data *data = i2c_get_clientdata(client);
432         int nr = to_sensor_dev_attr(attr)->index;
433         long val;
434         int err;
435
436         err = kstrtol(buf, 10, &val);
437         if (err)
438                 return err;
439
440         mutex_lock(&data->update_lock);
441         data->temp_high[nr] = TEMP_TO_REG(val);
442         lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
443         mutex_unlock(&data->update_lock);
444         return count;
445 }
446
447 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
448 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0);
449 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0);
450 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
451 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1);
452 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1);
453 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
454 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2);
455 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2);
456
457 static ssize_t temp1_crit_show(struct device *dev,
458                                struct device_attribute *attr, char *buf)
459 {
460         struct lm87_data *data = lm87_update_device(dev);
461         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
462 }
463
464 static ssize_t temp2_crit_show(struct device *dev,
465                                struct device_attribute *attr, char *buf)
466 {
467         struct lm87_data *data = lm87_update_device(dev);
468         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
469 }
470
471 static DEVICE_ATTR_RO(temp1_crit);
472 static DEVICE_ATTR_RO(temp2_crit);
473 static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL);
474
475 static ssize_t fan_input_show(struct device *dev,
476                               struct device_attribute *attr, char *buf)
477 {
478         struct lm87_data *data = lm87_update_device(dev);
479         int nr = to_sensor_dev_attr(attr)->index;
480
481         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
482                        FAN_DIV_FROM_REG(data->fan_div[nr])));
483 }
484
485 static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
486                             char *buf)
487 {
488         struct lm87_data *data = lm87_update_device(dev);
489         int nr = to_sensor_dev_attr(attr)->index;
490
491         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
492                        FAN_DIV_FROM_REG(data->fan_div[nr])));
493 }
494
495 static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
496                             char *buf)
497 {
498         struct lm87_data *data = lm87_update_device(dev);
499         int nr = to_sensor_dev_attr(attr)->index;
500
501         return sprintf(buf, "%d\n",
502                        FAN_DIV_FROM_REG(data->fan_div[nr]));
503 }
504
505 static ssize_t fan_min_store(struct device *dev,
506                              struct device_attribute *attr, const char *buf,
507                              size_t count)
508 {
509         struct i2c_client *client = dev_get_drvdata(dev);
510         struct lm87_data *data = i2c_get_clientdata(client);
511         int nr = to_sensor_dev_attr(attr)->index;
512         long val;
513         int err;
514
515         err = kstrtol(buf, 10, &val);
516         if (err)
517                 return err;
518
519         mutex_lock(&data->update_lock);
520         data->fan_min[nr] = FAN_TO_REG(val,
521                             FAN_DIV_FROM_REG(data->fan_div[nr]));
522         lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
523         mutex_unlock(&data->update_lock);
524         return count;
525 }
526
527 /*
528  * Note: we save and restore the fan minimum here, because its value is
529  * determined in part by the fan clock divider.  This follows the principle
530  * of least surprise; the user doesn't expect the fan minimum to change just
531  * because the divider changed.
532  */
533 static ssize_t fan_div_store(struct device *dev,
534                              struct device_attribute *attr, const char *buf,
535                              size_t count)
536 {
537         struct i2c_client *client = dev_get_drvdata(dev);
538         struct lm87_data *data = i2c_get_clientdata(client);
539         int nr = to_sensor_dev_attr(attr)->index;
540         long val;
541         int err;
542         unsigned long min;
543         u8 reg;
544
545         err = kstrtol(buf, 10, &val);
546         if (err)
547                 return err;
548
549         mutex_lock(&data->update_lock);
550         min = FAN_FROM_REG(data->fan_min[nr],
551                            FAN_DIV_FROM_REG(data->fan_div[nr]));
552
553         switch (val) {
554         case 1:
555                 data->fan_div[nr] = 0;
556                 break;
557         case 2:
558                 data->fan_div[nr] = 1;
559                 break;
560         case 4:
561                 data->fan_div[nr] = 2;
562                 break;
563         case 8:
564                 data->fan_div[nr] = 3;
565                 break;
566         default:
567                 mutex_unlock(&data->update_lock);
568                 return -EINVAL;
569         }
570
571         reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
572         switch (nr) {
573         case 0:
574             reg = (reg & 0xCF) | (data->fan_div[0] << 4);
575             break;
576         case 1:
577             reg = (reg & 0x3F) | (data->fan_div[1] << 6);
578             break;
579         }
580         lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
581
582         data->fan_min[nr] = FAN_TO_REG(min, val);
583         lm87_write_value(client, LM87_REG_FAN_MIN(nr),
584                          data->fan_min[nr]);
585         mutex_unlock(&data->update_lock);
586
587         return count;
588 }
589
590 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
591 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
592 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
593 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
594 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
595 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
596
597 static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
598                            char *buf)
599 {
600         struct lm87_data *data = lm87_update_device(dev);
601         return sprintf(buf, "%d\n", data->alarms);
602 }
603 static DEVICE_ATTR_RO(alarms);
604
605 static ssize_t cpu0_vid_show(struct device *dev,
606                              struct device_attribute *attr, char *buf)
607 {
608         struct lm87_data *data = lm87_update_device(dev);
609         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
610 }
611 static DEVICE_ATTR_RO(cpu0_vid);
612
613 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
614                         char *buf)
615 {
616         struct lm87_data *data = dev_get_drvdata(dev);
617         return sprintf(buf, "%d\n", data->vrm);
618 }
619 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
620                          const char *buf, size_t count)
621 {
622         struct lm87_data *data = dev_get_drvdata(dev);
623         unsigned long val;
624         int err;
625
626         err = kstrtoul(buf, 10, &val);
627         if (err)
628                 return err;
629
630         if (val > 255)
631                 return -EINVAL;
632
633         data->vrm = val;
634         return count;
635 }
636 static DEVICE_ATTR_RW(vrm);
637
638 static ssize_t aout_output_show(struct device *dev,
639                                 struct device_attribute *attr, char *buf)
640 {
641         struct lm87_data *data = lm87_update_device(dev);
642         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
643 }
644 static ssize_t aout_output_store(struct device *dev,
645                                  struct device_attribute *attr,
646                                  const char *buf, size_t count)
647 {
648         struct i2c_client *client = dev_get_drvdata(dev);
649         struct lm87_data *data = i2c_get_clientdata(client);
650         long val;
651         int err;
652
653         err = kstrtol(buf, 10, &val);
654         if (err)
655                 return err;
656
657         mutex_lock(&data->update_lock);
658         data->aout = AOUT_TO_REG(val);
659         lm87_write_value(client, LM87_REG_AOUT, data->aout);
660         mutex_unlock(&data->update_lock);
661         return count;
662 }
663 static DEVICE_ATTR_RW(aout_output);
664
665 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
666                           char *buf)
667 {
668         struct lm87_data *data = lm87_update_device(dev);
669         int bitnr = to_sensor_dev_attr(attr)->index;
670         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
671 }
672 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
673 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
674 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
675 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
676 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
677 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
678 static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);
679 static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7);
680 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
681 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);
682 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5);
683 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
684 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
685 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14);
686 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15);
687
688 /*
689  * Real code
690  */
691
692 static struct attribute *lm87_attributes[] = {
693         &sensor_dev_attr_in1_input.dev_attr.attr,
694         &sensor_dev_attr_in1_min.dev_attr.attr,
695         &sensor_dev_attr_in1_max.dev_attr.attr,
696         &sensor_dev_attr_in1_alarm.dev_attr.attr,
697         &sensor_dev_attr_in2_input.dev_attr.attr,
698         &sensor_dev_attr_in2_min.dev_attr.attr,
699         &sensor_dev_attr_in2_max.dev_attr.attr,
700         &sensor_dev_attr_in2_alarm.dev_attr.attr,
701         &sensor_dev_attr_in3_input.dev_attr.attr,
702         &sensor_dev_attr_in3_min.dev_attr.attr,
703         &sensor_dev_attr_in3_max.dev_attr.attr,
704         &sensor_dev_attr_in3_alarm.dev_attr.attr,
705         &sensor_dev_attr_in4_input.dev_attr.attr,
706         &sensor_dev_attr_in4_min.dev_attr.attr,
707         &sensor_dev_attr_in4_max.dev_attr.attr,
708         &sensor_dev_attr_in4_alarm.dev_attr.attr,
709
710         &sensor_dev_attr_temp1_input.dev_attr.attr,
711         &sensor_dev_attr_temp1_max.dev_attr.attr,
712         &sensor_dev_attr_temp1_min.dev_attr.attr,
713         &dev_attr_temp1_crit.attr,
714         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
715         &sensor_dev_attr_temp2_input.dev_attr.attr,
716         &sensor_dev_attr_temp2_max.dev_attr.attr,
717         &sensor_dev_attr_temp2_min.dev_attr.attr,
718         &dev_attr_temp2_crit.attr,
719         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
720         &sensor_dev_attr_temp2_fault.dev_attr.attr,
721
722         &dev_attr_alarms.attr,
723         &dev_attr_aout_output.attr,
724
725         NULL
726 };
727
728 static const struct attribute_group lm87_group = {
729         .attrs = lm87_attributes,
730 };
731
732 static struct attribute *lm87_attributes_in6[] = {
733         &sensor_dev_attr_in6_input.dev_attr.attr,
734         &sensor_dev_attr_in6_min.dev_attr.attr,
735         &sensor_dev_attr_in6_max.dev_attr.attr,
736         &sensor_dev_attr_in6_alarm.dev_attr.attr,
737         NULL
738 };
739
740 static const struct attribute_group lm87_group_in6 = {
741         .attrs = lm87_attributes_in6,
742 };
743
744 static struct attribute *lm87_attributes_fan1[] = {
745         &sensor_dev_attr_fan1_input.dev_attr.attr,
746         &sensor_dev_attr_fan1_min.dev_attr.attr,
747         &sensor_dev_attr_fan1_div.dev_attr.attr,
748         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
749         NULL
750 };
751
752 static const struct attribute_group lm87_group_fan1 = {
753         .attrs = lm87_attributes_fan1,
754 };
755
756 static struct attribute *lm87_attributes_in7[] = {
757         &sensor_dev_attr_in7_input.dev_attr.attr,
758         &sensor_dev_attr_in7_min.dev_attr.attr,
759         &sensor_dev_attr_in7_max.dev_attr.attr,
760         &sensor_dev_attr_in7_alarm.dev_attr.attr,
761         NULL
762 };
763
764 static const struct attribute_group lm87_group_in7 = {
765         .attrs = lm87_attributes_in7,
766 };
767
768 static struct attribute *lm87_attributes_fan2[] = {
769         &sensor_dev_attr_fan2_input.dev_attr.attr,
770         &sensor_dev_attr_fan2_min.dev_attr.attr,
771         &sensor_dev_attr_fan2_div.dev_attr.attr,
772         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
773         NULL
774 };
775
776 static const struct attribute_group lm87_group_fan2 = {
777         .attrs = lm87_attributes_fan2,
778 };
779
780 static struct attribute *lm87_attributes_temp3[] = {
781         &sensor_dev_attr_temp3_input.dev_attr.attr,
782         &sensor_dev_attr_temp3_max.dev_attr.attr,
783         &sensor_dev_attr_temp3_min.dev_attr.attr,
784         &dev_attr_temp3_crit.attr,
785         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
786         &sensor_dev_attr_temp3_fault.dev_attr.attr,
787         NULL
788 };
789
790 static const struct attribute_group lm87_group_temp3 = {
791         .attrs = lm87_attributes_temp3,
792 };
793
794 static struct attribute *lm87_attributes_in0_5[] = {
795         &sensor_dev_attr_in0_input.dev_attr.attr,
796         &sensor_dev_attr_in0_min.dev_attr.attr,
797         &sensor_dev_attr_in0_max.dev_attr.attr,
798         &sensor_dev_attr_in0_alarm.dev_attr.attr,
799         &sensor_dev_attr_in5_input.dev_attr.attr,
800         &sensor_dev_attr_in5_min.dev_attr.attr,
801         &sensor_dev_attr_in5_max.dev_attr.attr,
802         &sensor_dev_attr_in5_alarm.dev_attr.attr,
803         NULL
804 };
805
806 static const struct attribute_group lm87_group_in0_5 = {
807         .attrs = lm87_attributes_in0_5,
808 };
809
810 static struct attribute *lm87_attributes_vid[] = {
811         &dev_attr_cpu0_vid.attr,
812         &dev_attr_vrm.attr,
813         NULL
814 };
815
816 static const struct attribute_group lm87_group_vid = {
817         .attrs = lm87_attributes_vid,
818 };
819
820 /* Return 0 if detection is successful, -ENODEV otherwise */
821 static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
822 {
823         struct i2c_adapter *adapter = client->adapter;
824         const char *name;
825         u8 cid, rev;
826
827         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
828                 return -ENODEV;
829
830         if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
831                 return -ENODEV;
832
833         /* Now, we do the remaining detection. */
834         cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
835         rev = lm87_read_value(client, LM87_REG_REVISION);
836
837         if (cid == 0x02                 /* National Semiconductor */
838          && (rev >= 0x01 && rev <= 0x08))
839                 name = "lm87";
840         else if (cid == 0x41            /* Analog Devices */
841               && (rev & 0xf0) == 0x10)
842                 name = "adm1024";
843         else {
844                 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
845                         client->addr);
846                 return -ENODEV;
847         }
848
849         strlcpy(info->type, name, I2C_NAME_SIZE);
850
851         return 0;
852 }
853
854 static void lm87_restore_config(void *arg)
855 {
856         struct i2c_client *client = arg;
857         struct lm87_data *data = i2c_get_clientdata(client);
858
859         lm87_write_value(client, LM87_REG_CONFIG, data->config);
860 }
861
862 static int lm87_init_client(struct i2c_client *client)
863 {
864         struct lm87_data *data = i2c_get_clientdata(client);
865         int rc;
866         struct device_node *of_node = client->dev.of_node;
867         u8 val = 0;
868         struct regulator *vcc = NULL;
869
870         if (of_node) {
871                 if (of_property_read_bool(of_node, "has-temp3"))
872                         val |= CHAN_TEMP3;
873                 if (of_property_read_bool(of_node, "has-in6"))
874                         val |= CHAN_NO_FAN(0);
875                 if (of_property_read_bool(of_node, "has-in7"))
876                         val |= CHAN_NO_FAN(1);
877                 vcc = devm_regulator_get_optional(&client->dev, "vcc");
878                 if (!IS_ERR(vcc)) {
879                         if (regulator_get_voltage(vcc) == 5000000)
880                                 val |= CHAN_VCC_5V;
881                 }
882                 data->channel = val;
883                 lm87_write_value(client,
884                                 LM87_REG_CHANNEL_MODE, data->channel);
885         } else if (dev_get_platdata(&client->dev)) {
886                 data->channel = *(u8 *)dev_get_platdata(&client->dev);
887                 lm87_write_value(client,
888                                  LM87_REG_CHANNEL_MODE, data->channel);
889         } else {
890                 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
891         }
892         data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
893
894         rc = devm_add_action(&client->dev, lm87_restore_config, client);
895         if (rc)
896                 return rc;
897
898         if (!(data->config & 0x01)) {
899                 int i;
900
901                 /* Limits are left uninitialized after power-up */
902                 for (i = 1; i < 6; i++) {
903                         lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
904                         lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
905                 }
906                 for (i = 0; i < 2; i++) {
907                         lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
908                         lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
909                         lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
910                         lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
911                 }
912                 if (data->channel & CHAN_TEMP3) {
913                         lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
914                         lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
915                 } else {
916                         lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
917                         lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
918                 }
919         }
920
921         /* Make sure Start is set and INT#_Clear is clear */
922         if ((data->config & 0x09) != 0x01)
923                 lm87_write_value(client, LM87_REG_CONFIG,
924                                  (data->config & 0x77) | 0x01);
925         return 0;
926 }
927
928 static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
929 {
930         struct lm87_data *data;
931         struct device *hwmon_dev;
932         int err;
933         unsigned int group_tail = 0;
934
935         data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
936         if (!data)
937                 return -ENOMEM;
938
939         i2c_set_clientdata(client, data);
940         mutex_init(&data->update_lock);
941
942         /* Initialize the LM87 chip */
943         err = lm87_init_client(client);
944         if (err)
945                 return err;
946
947         data->in_scale[0] = 2500;
948         data->in_scale[1] = 2700;
949         data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
950         data->in_scale[3] = 5000;
951         data->in_scale[4] = 12000;
952         data->in_scale[5] = 2700;
953         data->in_scale[6] = 1875;
954         data->in_scale[7] = 1875;
955
956         /*
957          * Construct the list of attributes, the list depends on the
958          * configuration of the chip
959          */
960         data->attr_groups[group_tail++] = &lm87_group;
961         if (data->channel & CHAN_NO_FAN(0))
962                 data->attr_groups[group_tail++] = &lm87_group_in6;
963         else
964                 data->attr_groups[group_tail++] = &lm87_group_fan1;
965
966         if (data->channel & CHAN_NO_FAN(1))
967                 data->attr_groups[group_tail++] = &lm87_group_in7;
968         else
969                 data->attr_groups[group_tail++] = &lm87_group_fan2;
970
971         if (data->channel & CHAN_TEMP3)
972                 data->attr_groups[group_tail++] = &lm87_group_temp3;
973         else
974                 data->attr_groups[group_tail++] = &lm87_group_in0_5;
975
976         if (!(data->channel & CHAN_NO_VID)) {
977                 data->vrm = vid_which_vrm();
978                 data->attr_groups[group_tail++] = &lm87_group_vid;
979         }
980
981         hwmon_dev = devm_hwmon_device_register_with_groups(
982             &client->dev, client->name, client, data->attr_groups);
983         return PTR_ERR_OR_ZERO(hwmon_dev);
984 }
985
986 /*
987  * Driver data (common to all clients)
988  */
989
990 static const struct i2c_device_id lm87_id[] = {
991         { "lm87", 0 },
992         { "adm1024", 0 },
993         { }
994 };
995 MODULE_DEVICE_TABLE(i2c, lm87_id);
996
997 static const struct of_device_id lm87_of_match[] = {
998         { .compatible = "ti,lm87" },
999         { .compatible = "adi,adm1024" },
1000         { },
1001 };
1002 MODULE_DEVICE_TABLE(of, lm87_of_match);
1003
1004 static struct i2c_driver lm87_driver = {
1005         .class          = I2C_CLASS_HWMON,
1006         .driver = {
1007                 .name   = "lm87",
1008                 .of_match_table = lm87_of_match,
1009         },
1010         .probe          = lm87_probe,
1011         .id_table       = lm87_id,
1012         .detect         = lm87_detect,
1013         .address_list   = normal_i2c,
1014 };
1015
1016 module_i2c_driver(lm87_driver);
1017
1018 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");
1019 MODULE_DESCRIPTION("LM87 driver");
1020 MODULE_LICENSE("GPL");