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[karo-tx-linux.git] / drivers / hwmon / emc6w201.c
1 /*
2  * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201
3  * Copyright (C) 2011  Jean Delvare <jdelvare@suse.de>
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 /*
31  * Addresses to scan
32  */
33
34 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
35
36 /*
37  * The EMC6W201 registers
38  */
39
40 #define EMC6W201_REG_IN(nr)             (0x20 + (nr))
41 #define EMC6W201_REG_TEMP(nr)           (0x26 + (nr))
42 #define EMC6W201_REG_FAN(nr)            (0x2C + (nr) * 2)
43 #define EMC6W201_REG_COMPANY            0x3E
44 #define EMC6W201_REG_VERSTEP            0x3F
45 #define EMC6W201_REG_CONFIG             0x40
46 #define EMC6W201_REG_IN_LOW(nr)         (0x4A + (nr) * 2)
47 #define EMC6W201_REG_IN_HIGH(nr)        (0x4B + (nr) * 2)
48 #define EMC6W201_REG_TEMP_LOW(nr)       (0x56 + (nr) * 2)
49 #define EMC6W201_REG_TEMP_HIGH(nr)      (0x57 + (nr) * 2)
50 #define EMC6W201_REG_FAN_MIN(nr)        (0x62 + (nr) * 2)
51
52 enum subfeature { input, min, max };
53
54 /*
55  * Per-device data
56  */
57
58 struct emc6w201_data {
59         struct i2c_client *client;
60         struct mutex update_lock;
61         char valid; /* zero until following fields are valid */
62         unsigned long last_updated; /* in jiffies */
63
64         /* registers values */
65         u8 in[3][6];
66         s8 temp[3][6];
67         u16 fan[2][5];
68 };
69
70 /*
71  * Combine LSB and MSB registers in a single value
72  * Locking: must be called with data->update_lock held
73  */
74 static u16 emc6w201_read16(struct i2c_client *client, u8 reg)
75 {
76         int lsb, msb;
77
78         lsb = i2c_smbus_read_byte_data(client, reg);
79         msb = i2c_smbus_read_byte_data(client, reg + 1);
80         if (unlikely(lsb < 0 || msb < 0)) {
81                 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
82                         16, "read", reg);
83                 return 0xFFFF;  /* Arbitrary value */
84         }
85
86         return (msb << 8) | lsb;
87 }
88
89 /*
90  * Write 16-bit value to LSB and MSB registers
91  * Locking: must be called with data->update_lock held
92  */
93 static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)
94 {
95         int err;
96
97         err = i2c_smbus_write_byte_data(client, reg, val & 0xff);
98         if (likely(!err))
99                 err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8);
100         if (unlikely(err < 0))
101                 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
102                         16, "write", reg);
103
104         return err;
105 }
106
107 /* Read 8-bit value from register */
108 static u8 emc6w201_read8(struct i2c_client *client, u8 reg)
109 {
110         int val;
111
112         val = i2c_smbus_read_byte_data(client, reg);
113         if (unlikely(val < 0)) {
114                 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
115                         8, "read", reg);
116                 return 0x00;    /* Arbitrary value */
117         }
118
119         return val;
120 }
121
122 /* Write 8-bit value to register */
123 static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val)
124 {
125         int err;
126
127         err = i2c_smbus_write_byte_data(client, reg, val);
128         if (unlikely(err < 0))
129                 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
130                         8, "write", reg);
131
132         return err;
133 }
134
135 static struct emc6w201_data *emc6w201_update_device(struct device *dev)
136 {
137         struct emc6w201_data *data = dev_get_drvdata(dev);
138         struct i2c_client *client = data->client;
139         int nr;
140
141         mutex_lock(&data->update_lock);
142
143         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
144                 for (nr = 0; nr < 6; nr++) {
145                         data->in[input][nr] =
146                                 emc6w201_read8(client,
147                                                 EMC6W201_REG_IN(nr));
148                         data->in[min][nr] =
149                                 emc6w201_read8(client,
150                                                 EMC6W201_REG_IN_LOW(nr));
151                         data->in[max][nr] =
152                                 emc6w201_read8(client,
153                                                 EMC6W201_REG_IN_HIGH(nr));
154                 }
155
156                 for (nr = 0; nr < 6; nr++) {
157                         data->temp[input][nr] =
158                                 emc6w201_read8(client,
159                                                 EMC6W201_REG_TEMP(nr));
160                         data->temp[min][nr] =
161                                 emc6w201_read8(client,
162                                                 EMC6W201_REG_TEMP_LOW(nr));
163                         data->temp[max][nr] =
164                                 emc6w201_read8(client,
165                                                 EMC6W201_REG_TEMP_HIGH(nr));
166                 }
167
168                 for (nr = 0; nr < 5; nr++) {
169                         data->fan[input][nr] =
170                                 emc6w201_read16(client,
171                                                 EMC6W201_REG_FAN(nr));
172                         data->fan[min][nr] =
173                                 emc6w201_read16(client,
174                                                 EMC6W201_REG_FAN_MIN(nr));
175                 }
176
177                 data->last_updated = jiffies;
178                 data->valid = 1;
179         }
180
181         mutex_unlock(&data->update_lock);
182
183         return data;
184 }
185
186 /*
187  * Sysfs callback functions
188  */
189
190 static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };
191
192 static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
193         char *buf)
194 {
195         struct emc6w201_data *data = emc6w201_update_device(dev);
196         int sf = to_sensor_dev_attr_2(devattr)->index;
197         int nr = to_sensor_dev_attr_2(devattr)->nr;
198
199         return sprintf(buf, "%u\n",
200                        (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0);
201 }
202
203 static ssize_t set_in(struct device *dev, struct device_attribute *devattr,
204                       const char *buf, size_t count)
205 {
206         struct emc6w201_data *data = dev_get_drvdata(dev);
207         struct i2c_client *client = data->client;
208         int sf = to_sensor_dev_attr_2(devattr)->index;
209         int nr = to_sensor_dev_attr_2(devattr)->nr;
210         int err;
211         long val;
212         u8 reg;
213
214         err = kstrtol(buf, 10, &val);
215         if (err < 0)
216                 return err;
217
218         val = DIV_ROUND_CLOSEST(val * 0xC0, nominal_mv[nr]);
219         reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr)
220                           : EMC6W201_REG_IN_HIGH(nr);
221
222         mutex_lock(&data->update_lock);
223         data->in[sf][nr] = clamp_val(val, 0, 255);
224         err = emc6w201_write8(client, reg, data->in[sf][nr]);
225         mutex_unlock(&data->update_lock);
226
227         return err < 0 ? err : count;
228 }
229
230 static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
231         char *buf)
232 {
233         struct emc6w201_data *data = emc6w201_update_device(dev);
234         int sf = to_sensor_dev_attr_2(devattr)->index;
235         int nr = to_sensor_dev_attr_2(devattr)->nr;
236
237         return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000);
238 }
239
240 static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
241                         const char *buf, size_t count)
242 {
243         struct emc6w201_data *data = dev_get_drvdata(dev);
244         struct i2c_client *client = data->client;
245         int sf = to_sensor_dev_attr_2(devattr)->index;
246         int nr = to_sensor_dev_attr_2(devattr)->nr;
247         int err;
248         long val;
249         u8 reg;
250
251         err = kstrtol(buf, 10, &val);
252         if (err < 0)
253                 return err;
254
255         val = DIV_ROUND_CLOSEST(val, 1000);
256         reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
257                           : EMC6W201_REG_TEMP_HIGH(nr);
258
259         mutex_lock(&data->update_lock);
260         data->temp[sf][nr] = clamp_val(val, -127, 127);
261         err = emc6w201_write8(client, reg, data->temp[sf][nr]);
262         mutex_unlock(&data->update_lock);
263
264         return err < 0 ? err : count;
265 }
266
267 static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,
268         char *buf)
269 {
270         struct emc6w201_data *data = emc6w201_update_device(dev);
271         int sf = to_sensor_dev_attr_2(devattr)->index;
272         int nr = to_sensor_dev_attr_2(devattr)->nr;
273         unsigned rpm;
274
275         if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF)
276                 rpm = 0;
277         else
278                 rpm = 5400000U / data->fan[sf][nr];
279
280         return sprintf(buf, "%u\n", rpm);
281 }
282
283 static ssize_t set_fan(struct device *dev, struct device_attribute *devattr,
284                        const char *buf, size_t count)
285 {
286         struct emc6w201_data *data = dev_get_drvdata(dev);
287         struct i2c_client *client = data->client;
288         int sf = to_sensor_dev_attr_2(devattr)->index;
289         int nr = to_sensor_dev_attr_2(devattr)->nr;
290         int err;
291         unsigned long val;
292
293         err = kstrtoul(buf, 10, &val);
294         if (err < 0)
295                 return err;
296
297         if (val == 0) {
298                 val = 0xFFFF;
299         } else {
300                 val = DIV_ROUND_CLOSEST(5400000U, val);
301                 val = clamp_val(val, 0, 0xFFFE);
302         }
303
304         mutex_lock(&data->update_lock);
305         data->fan[sf][nr] = val;
306         err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr),
307                                data->fan[sf][nr]);
308         mutex_unlock(&data->update_lock);
309
310         return err < 0 ? err : count;
311 }
312
313 static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, input);
314 static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, set_in,
315                             0, min);
316 static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, set_in,
317                             0, max);
318 static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, input);
319 static SENSOR_DEVICE_ATTR_2(in1_min, S_IRUGO | S_IWUSR, show_in, set_in,
320                             1, min);
321 static SENSOR_DEVICE_ATTR_2(in1_max, S_IRUGO | S_IWUSR, show_in, set_in,
322                             1, max);
323 static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, input);
324 static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, set_in,
325                             2, min);
326 static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, set_in,
327                             2, max);
328 static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, input);
329 static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, set_in,
330                             3, min);
331 static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, set_in,
332                             3, max);
333 static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, input);
334 static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, set_in,
335                             4, min);
336 static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, set_in,
337                             4, max);
338 static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO, show_in, NULL, 5, input);
339 static SENSOR_DEVICE_ATTR_2(in5_min, S_IRUGO | S_IWUSR, show_in, set_in,
340                             5, min);
341 static SENSOR_DEVICE_ATTR_2(in5_max, S_IRUGO | S_IWUSR, show_in, set_in,
342                             5, max);
343
344 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, input);
345 static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
346                             0, min);
347 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
348                             0, max);
349 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, input);
350 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
351                             1, min);
352 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
353                             1, max);
354 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 2, input);
355 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
356                             2, min);
357 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
358                             2, max);
359 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 3, input);
360 static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
361                             3, min);
362 static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
363                             3, max);
364 static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 4, input);
365 static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
366                             4, min);
367 static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
368                             4, max);
369 static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 5, input);
370 static SENSOR_DEVICE_ATTR_2(temp6_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
371                             5, min);
372 static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
373                             5, max);
374
375 static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_fan, NULL, 0, input);
376 static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
377                             0, min);
378 static SENSOR_DEVICE_ATTR_2(fan2_input, S_IRUGO, show_fan, NULL, 1, input);
379 static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
380                             1, min);
381 static SENSOR_DEVICE_ATTR_2(fan3_input, S_IRUGO, show_fan, NULL, 2, input);
382 static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
383                             2, min);
384 static SENSOR_DEVICE_ATTR_2(fan4_input, S_IRUGO, show_fan, NULL, 3, input);
385 static SENSOR_DEVICE_ATTR_2(fan4_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
386                             3, min);
387 static SENSOR_DEVICE_ATTR_2(fan5_input, S_IRUGO, show_fan, NULL, 4, input);
388 static SENSOR_DEVICE_ATTR_2(fan5_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
389                             4, min);
390
391 static struct attribute *emc6w201_attrs[] = {
392         &sensor_dev_attr_in0_input.dev_attr.attr,
393         &sensor_dev_attr_in0_min.dev_attr.attr,
394         &sensor_dev_attr_in0_max.dev_attr.attr,
395         &sensor_dev_attr_in1_input.dev_attr.attr,
396         &sensor_dev_attr_in1_min.dev_attr.attr,
397         &sensor_dev_attr_in1_max.dev_attr.attr,
398         &sensor_dev_attr_in2_input.dev_attr.attr,
399         &sensor_dev_attr_in2_min.dev_attr.attr,
400         &sensor_dev_attr_in2_max.dev_attr.attr,
401         &sensor_dev_attr_in3_input.dev_attr.attr,
402         &sensor_dev_attr_in3_min.dev_attr.attr,
403         &sensor_dev_attr_in3_max.dev_attr.attr,
404         &sensor_dev_attr_in4_input.dev_attr.attr,
405         &sensor_dev_attr_in4_min.dev_attr.attr,
406         &sensor_dev_attr_in4_max.dev_attr.attr,
407         &sensor_dev_attr_in5_input.dev_attr.attr,
408         &sensor_dev_attr_in5_min.dev_attr.attr,
409         &sensor_dev_attr_in5_max.dev_attr.attr,
410
411         &sensor_dev_attr_temp1_input.dev_attr.attr,
412         &sensor_dev_attr_temp1_min.dev_attr.attr,
413         &sensor_dev_attr_temp1_max.dev_attr.attr,
414         &sensor_dev_attr_temp2_input.dev_attr.attr,
415         &sensor_dev_attr_temp2_min.dev_attr.attr,
416         &sensor_dev_attr_temp2_max.dev_attr.attr,
417         &sensor_dev_attr_temp3_input.dev_attr.attr,
418         &sensor_dev_attr_temp3_min.dev_attr.attr,
419         &sensor_dev_attr_temp3_max.dev_attr.attr,
420         &sensor_dev_attr_temp4_input.dev_attr.attr,
421         &sensor_dev_attr_temp4_min.dev_attr.attr,
422         &sensor_dev_attr_temp4_max.dev_attr.attr,
423         &sensor_dev_attr_temp5_input.dev_attr.attr,
424         &sensor_dev_attr_temp5_min.dev_attr.attr,
425         &sensor_dev_attr_temp5_max.dev_attr.attr,
426         &sensor_dev_attr_temp6_input.dev_attr.attr,
427         &sensor_dev_attr_temp6_min.dev_attr.attr,
428         &sensor_dev_attr_temp6_max.dev_attr.attr,
429
430         &sensor_dev_attr_fan1_input.dev_attr.attr,
431         &sensor_dev_attr_fan1_min.dev_attr.attr,
432         &sensor_dev_attr_fan2_input.dev_attr.attr,
433         &sensor_dev_attr_fan2_min.dev_attr.attr,
434         &sensor_dev_attr_fan3_input.dev_attr.attr,
435         &sensor_dev_attr_fan3_min.dev_attr.attr,
436         &sensor_dev_attr_fan4_input.dev_attr.attr,
437         &sensor_dev_attr_fan4_min.dev_attr.attr,
438         &sensor_dev_attr_fan5_input.dev_attr.attr,
439         &sensor_dev_attr_fan5_min.dev_attr.attr,
440         NULL
441 };
442
443 ATTRIBUTE_GROUPS(emc6w201);
444
445 /*
446  * Driver interface
447  */
448
449 /* Return 0 if detection is successful, -ENODEV otherwise */
450 static int emc6w201_detect(struct i2c_client *client,
451                            struct i2c_board_info *info)
452 {
453         struct i2c_adapter *adapter = client->adapter;
454         int company, verstep, config;
455
456         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
457                 return -ENODEV;
458
459         /* Identification */
460         company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY);
461         if (company != 0x5C)
462                 return -ENODEV;
463         verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP);
464         if (verstep < 0 || (verstep & 0xF0) != 0xB0)
465                 return -ENODEV;
466         if ((verstep & 0x0F) > 2) {
467                 dev_dbg(&client->dev, "Unknwown EMC6W201 stepping %d\n",
468                         verstep & 0x0F);
469                 return -ENODEV;
470         }
471
472         /* Check configuration */
473         config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);
474         if (config < 0 || (config & 0xF4) != 0x04)
475                 return -ENODEV;
476         if (!(config & 0x01)) {
477                 dev_err(&client->dev, "Monitoring not enabled\n");
478                 return -ENODEV;
479         }
480
481         strlcpy(info->type, "emc6w201", I2C_NAME_SIZE);
482
483         return 0;
484 }
485
486 static int emc6w201_probe(struct i2c_client *client,
487                           const struct i2c_device_id *id)
488 {
489         struct device *dev = &client->dev;
490         struct emc6w201_data *data;
491         struct device *hwmon_dev;
492
493         data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL);
494         if (!data)
495                 return -ENOMEM;
496
497         data->client = client;
498         mutex_init(&data->update_lock);
499
500         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
501                                                            data,
502                                                            emc6w201_groups);
503         return PTR_ERR_OR_ZERO(hwmon_dev);
504 }
505
506 static const struct i2c_device_id emc6w201_id[] = {
507         { "emc6w201", 0 },
508         { }
509 };
510 MODULE_DEVICE_TABLE(i2c, emc6w201_id);
511
512 static struct i2c_driver emc6w201_driver = {
513         .class          = I2C_CLASS_HWMON,
514         .driver = {
515                 .name   = "emc6w201",
516         },
517         .probe          = emc6w201_probe,
518         .id_table       = emc6w201_id,
519         .detect         = emc6w201_detect,
520         .address_list   = normal_i2c,
521 };
522
523 module_i2c_driver(emc6w201_driver);
524
525 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
526 MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver");
527 MODULE_LICENSE("GPL");