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Lynx framebuffers multidomain implementation.
[linux/elbrus.git] / drivers / hwmon / lm95231.c
blob7a217a356aa7fc4555b45698a9d6d68a5d5cdff8
1 /*
2 * lm95231.c - Support for LM95231 temperature sensor, based on LM95241 driver.
3 *
4 * Copyright (C) 2012 Evgeny Kravtsunov <kravtsunov_e@mcst.ru>
5 *
6 * The LM95245 is a sensor chip made by National Semiconductors.
7 * Complete datasheet can be obtained from National's website at:
8 * http://www.national.com/pf/LM/LM95231.html
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/slab.h>
28 #include <linux/jiffies.h>
29 #include <linux/i2c.h>
30 #include <linux/hwmon.h>
31 #include <linux/hwmon-sysfs.h>
32 #include <linux/err.h>
33 #include <linux/mutex.h>
34 #include <linux/sysfs.h>
35
36 static const unsigned short normal_i2c[] = {
37 0x19, 0x2b, I2C_CLIENT_END};
38
39 /* LM95231 registers */
40 #define LM95231_REG_R_MAN_ID 0xFE
41 #define LM95231_REG_R_CHIP_ID 0xFF
42 #define LM95231_REG_R_STATUS 0x02
43 #define LM95231_REG_RW_CONFIG 0x03
44 #define LM95231_REG_RW_REM_FILTER 0x06
45 #define LM95231_REG_RW_TRUTHERM 0x07
46 #define LM95231_REG_W_ONE_SHOT 0x0F
47 #define LM95231_REG_R_LOCAL_TEMPH 0x10
48 #define LM95231_REG_R_REMOTE1_TEMPH 0x11
49 #define LM95231_REG_R_REMOTE2_TEMPH 0x12
50 #define LM95231_REG_R_LOCAL_TEMPL 0x20
51 #define LM95231_REG_R_REMOTE1_TEMPL 0x21
52 #define LM95231_REG_R_REMOTE2_TEMPL 0x22
53 #define LM95231_REG_RW_REMOTE_MODEL 0x30
54
55 /* LM95231 specific bitfields */
56 #define CFG_STOP 0x40
57 #define CFG_CR0076 0x00
58 #define CFG_CR0182 0x10
59 #define CFG_CR1000 0x20
60 #define CFG_CR2700 0x30
61 #define R1MS_SHIFT 0
62 #define R2MS_SHIFT 2
63 #define R1MS_MASK (0x01 << (R1MS_SHIFT))
64 #define R2MS_MASK (0x01 << (R2MS_SHIFT))
65 #define R1DF_SHIFT 1
66 #define R2DF_SHIFT 2
67 #define R1DF_MASK (0x01 << (R1DF_SHIFT))
68 #define R2DF_MASK (0x01 << (R2DF_SHIFT))
69 #define R1FE_MASK 0x01
70 #define R2FE_MASK 0x04
71 #define TT1_SHIFT 0
72 #define TT2_SHIFT 4
73 #define TT_OFF 0
74 #define TT_ON 1
75 #define TT_MASK 7
76 #define MANUFACTURER_ID 0x01
77 #define DEFAULT_REVISION 0xA1
78
79 /* Conversions and various macros */
80 #define TEMP_FROM_REG(val_h, val_l) \
81 (((val_h) & 0x80 ? (char)((~(val_h - 1)) * (-1)) : \
82 (val_h)) * 1000 + (val_l) * 1000 / 256)
83
84 /* Functions declaration */
85 static void lm95231_init_client(struct i2c_client *client);
86 static struct lm95231_data *lm95231_update_device(struct device *dev);
87
88 /* Client data (each client gets its own) */
89 struct lm95231_data {
90 struct device *hwmon_dev;
91 struct mutex update_lock;
92 unsigned long last_updated, rate; /* in jiffies */
93 char valid; /* zero until following fields are valid */
94 /* registers values */
95 s32 local_h, local_l; /* local */
96 s32 remote1_h, remote1_l; /* remote1 */
97 s32 remote2_h, remote2_l; /* remote2 */
98 s32 local_h_st, local_l_st; /* status of i2c transaction
99 * local_h, local_l */
100 s32 remote1_h_st; /* status of i2c transaction remote1_h */
101 s32 remote1_l_st; /* status of i2c transaction remote1_l */
102 s32 remote2_h_st; /* status of i2c transaction remote2_h */
103 s32 remote2_l_st; /* status of i2c transaction remote2_l */
104 u8 config, model, trutherm;
105 };
106
107 /* Sysfs stuff */
108 #define show_temp(value) \
109 static ssize_t show_##value(struct device *dev, \
110 struct device_attribute *attr, char *buf) \
111 { \
112 struct lm95231_data *data = lm95231_update_device(dev); \
113 \
114 if (data->value##_h_st < 0 || data->value##_l_st < 0) \
115 snprintf(buf, PAGE_SIZE - 1, "Error\n"); \
116 else \
117 snprintf(buf, PAGE_SIZE - 1, "%d\n", \
118 TEMP_FROM_REG(data->value##_h, data->value##_l)); \
119 return strlen(buf); \
120 }
121 show_temp(local);
122 show_temp(remote1);
123 show_temp(remote2);
124
125 static ssize_t show_rate(struct device *dev, struct device_attribute *attr,
126 char *buf)
127 {
128 struct lm95231_data *data = lm95231_update_device(dev);
129
130 snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->rate / HZ);
131 return strlen(buf);
132 }
133
134 static ssize_t set_rate(struct device *dev, struct device_attribute *attr,
135 const char *buf, size_t count)
136 {
137 struct i2c_client *client = to_i2c_client(dev);
138 struct lm95231_data *data = i2c_get_clientdata(client);
139
140 strict_strtol(buf, 10, &data->rate);
141 data->rate = data->rate * HZ / 1000;
142
143 return count;
144 }
145
146 #define show_type(flag) \
147 static ssize_t show_type##flag(struct device *dev, \
148 struct device_attribute *attr, char *buf) \
149 { \
150 struct i2c_client *client = to_i2c_client(dev); \
151 struct lm95231_data *data = i2c_get_clientdata(client); \
152 \
153 snprintf(buf, PAGE_SIZE - 1, \
154 data->model & R##flag##MS_MASK ? "1\n" : "2\n"); \
155 return strlen(buf); \
156 }
157 show_type(1);
158 show_type(2);
159
160 #define show_min(flag) \
161 static ssize_t show_min##flag(struct device *dev, \
162 struct device_attribute *attr, char *buf) \
163 { \
164 struct i2c_client *client = to_i2c_client(dev); \
165 struct lm95231_data *data = i2c_get_clientdata(client); \
166 \
167 snprintf(buf, PAGE_SIZE - 1, \
168 data->config & R##flag##DF_MASK ? \
169 "-127000\n" : "0\n"); \
170 return strlen(buf); \
171 }
172 show_min(1);
173 show_min(2);
174
175 #define show_max(flag) \
176 static ssize_t show_max##flag(struct device *dev, \
177 struct device_attribute *attr, char *buf) \
178 { \
179 struct i2c_client *client = to_i2c_client(dev); \
180 struct lm95231_data *data = i2c_get_clientdata(client); \
181 \
182 snprintf(buf, PAGE_SIZE - 1, \
183 data->config & R##flag##DF_MASK ? \
184 "127000\n" : "255000\n"); \
185 return strlen(buf); \
186 }
187 show_max(1);
188 show_max(2);
189
190 #define set_type(flag) \
191 static ssize_t set_type##flag(struct device *dev, \
192 struct device_attribute *attr, \
193 const char *buf, size_t count) \
194 { \
195 struct i2c_client *client = to_i2c_client(dev); \
196 struct lm95231_data *data = i2c_get_clientdata(client); \
197 \
198 long val; \
199 strict_strtol(buf, 10, &val); \
200 \
201 if ((val == 1) || (val == 2)) { \
202 \
203 mutex_lock(&data->update_lock); \
204 \
205 data->trutherm &= ~(TT_MASK << TT##flag##_SHIFT); \
206 if (val == 1) { \
207 data->model |= R##flag##MS_MASK; \
208 data->trutherm |= (TT_ON << TT##flag##_SHIFT); \
209 } \
210 else { \
211 data->model &= ~R##flag##MS_MASK; \
212 data->trutherm |= (TT_OFF << TT##flag##_SHIFT); \
213 } \
214 \
215 data->valid = 0; \
216 \
217 i2c_smbus_write_byte_data(client, \
218 LM95231_REG_RW_REMOTE_MODEL, \
219 data->model); \
220 i2c_smbus_write_byte_data(client, \
221 LM95231_REG_RW_TRUTHERM, \
222 data->trutherm); \
223 \
224 mutex_unlock(&data->update_lock); \
225 \
226 } \
227 return count; \
228 }
229 set_type(1);
230 set_type(2);
231
232 #define set_min(flag) \
233 static ssize_t set_min##flag(struct device *dev, \
234 struct device_attribute *devattr, const char *buf, \
235 size_t count) \
236 { \
237 struct i2c_client *client = to_i2c_client(dev); \
238 struct lm95231_data *data = i2c_get_clientdata(client); \
239 \
240 long val; \
241 strict_strtol(buf, 10, &val); \
242 \
243 mutex_lock(&data->update_lock); \
244 \
245 if (val < 0) \
246 data->config |= R##flag##DF_MASK; \
247 else \
248 data->config &= ~R##flag##DF_MASK; \
249 \
250 data->valid = 0; \
251 \
252 i2c_smbus_write_byte_data(client, LM95231_REG_RW_CONFIG, \
253 data->config); \
254 \
255 mutex_unlock(&data->update_lock); \
256 \
257 return count; \
258 }
259 set_min(1);
260 set_min(2);
261
262 #define set_max(flag) \
263 static ssize_t set_max##flag(struct device *dev, \
264 struct device_attribute *devattr, const char *buf, \
265 size_t count) \
266 { \
267 struct i2c_client *client = to_i2c_client(dev); \
268 struct lm95231_data *data = i2c_get_clientdata(client); \
269 \
270 long val; \
271 strict_strtol(buf, 10, &val); \
272 \
273 mutex_lock(&data->update_lock); \
274 \
275 if (val <= 127000) \
276 data->config |= R##flag##DF_MASK; \
277 else \
278 data->config &= ~R##flag##DF_MASK; \
279 \
280 data->valid = 0; \
281 \
282 i2c_smbus_write_byte_data(client, LM95231_REG_RW_CONFIG, \
283 data->config); \
284 \
285 mutex_unlock(&data->update_lock); \
286 \
287 return count; \
288 }
289 set_max(1);
290 set_max(2);
291
292 static DEVICE_ATTR(temp1_input, S_IRUGO, show_local, NULL);
293 static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote1, NULL);
294 static DEVICE_ATTR(temp3_input, S_IRUGO, show_remote2, NULL);
295 static DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type1, set_type1);
296 static DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type2, set_type2);
297 static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min1, set_min1);
298 static DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min2, set_min2);
299 static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max1, set_max1);
300 static DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max2, set_max2);
301 static DEVICE_ATTR(rate, S_IWUSR | S_IRUGO, show_rate, set_rate);
302
303 static struct attribute *lm95231_attributes[] = {
304 &dev_attr_temp1_input.attr,
305 &dev_attr_temp2_input.attr,
306 &dev_attr_temp3_input.attr,
307 &dev_attr_temp2_type.attr,
308 &dev_attr_temp3_type.attr,
309 &dev_attr_temp2_min.attr,
310 &dev_attr_temp3_min.attr,
311 &dev_attr_temp2_max.attr,
312 &dev_attr_temp3_max.attr,
313 &dev_attr_rate.attr,
314 NULL
315 };
316
317 static const struct attribute_group lm95231_group = {
318 .attrs = lm95231_attributes,
319 };
320
321 /* Return 0 if detection is successful, -ENODEV otherwise */
322 static int lm95231_detect(struct i2c_client *new_client,
323 struct i2c_board_info *info)
324 {
325 struct i2c_adapter *adapter = new_client->adapter;
326 int address = new_client->addr;
327 const char *name;
328
329 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
330 return -ENODEV;
331 }
332
333 if ((i2c_smbus_read_byte_data(new_client, LM95231_REG_R_MAN_ID)
334 == MANUFACTURER_ID)
335 && (i2c_smbus_read_byte_data(new_client, LM95231_REG_R_CHIP_ID)
336 >= DEFAULT_REVISION)) {
337 name = "lm95231";
338 } else {
339 dev_dbg(&adapter->dev, "LM95231 detection failed at 0x%02x\n",
340 address);
341 return -ENODEV;
342 }
343
344 /* Fill the i2c board info */
345 strlcpy(info->type, name, I2C_NAME_SIZE);
346 return 0;
347 }
348
349 static int lm95231_probe(struct i2c_client *new_client,
350 const struct i2c_device_id *id)
351 {
352 struct lm95231_data *data;
353 int err;
354
355 data = kzalloc(sizeof(struct lm95231_data), GFP_KERNEL);
356 if (!data) {
357 err = -ENOMEM;
358 goto exit;
359 }
360
361 i2c_set_clientdata(new_client, data);
362 mutex_init(&data->update_lock);
363
364 /* Initialize the LM95231 chip */
365 lm95231_init_client(new_client);
366
367 /* Register sysfs hooks */
368 err = sysfs_create_group(&new_client->dev.kobj, &lm95231_group);
369 if (err)
370 goto exit_free;
371
372 data->hwmon_dev = hwmon_device_register(&new_client->dev);
373 if (IS_ERR(data->hwmon_dev)) {
374 err = PTR_ERR(data->hwmon_dev);
375 goto exit_remove_files;
376 }
377
378 return 0;
379
380 exit_remove_files:
381 sysfs_remove_group(&new_client->dev.kobj, &lm95231_group);
382 exit_free:
383 kfree(data);
384 exit:
385 return err;
386 }
387
388 static void lm95231_init_client(struct i2c_client *client)
389 {
390 struct lm95231_data *data = i2c_get_clientdata(client);
391
392 data->rate = HZ; /* 1 sec default */
393 data->valid = 0;
394 data->config = CFG_CR0076;
395 data->model = 0;
396 data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT);
397
398 i2c_smbus_write_byte_data(client, LM95231_REG_RW_CONFIG,
399 data->config);
400 i2c_smbus_write_byte_data(client, LM95231_REG_RW_REM_FILTER,
401 R1FE_MASK | R2FE_MASK);
402 i2c_smbus_write_byte_data(client, LM95231_REG_RW_TRUTHERM,
403 data->trutherm);
404 i2c_smbus_write_byte_data(client, LM95231_REG_RW_REMOTE_MODEL,
405 data->model);
406 }
407
408 static int lm95231_remove(struct i2c_client *client)
409 {
410 struct lm95231_data *data = i2c_get_clientdata(client);
411
412 hwmon_device_unregister(data->hwmon_dev);
413 sysfs_remove_group(&client->dev.kobj, &lm95231_group);
414
415 i2c_set_clientdata(client, NULL);
416 kfree(data);
417 return 0;
418 }
419
420 static struct lm95231_data *lm95231_update_device(struct device *dev)
421 {
422 struct i2c_client *client = to_i2c_client(dev);
423 struct lm95231_data *data = i2c_get_clientdata(client);
424
425 mutex_lock(&data->update_lock);
426
427 if (time_after(jiffies, data->last_updated + data->rate) ||
428 !data->valid) {
429 dev_dbg(&client->dev, "Updating lm95231 data.\n");
430 data->local_h_st = i2c_smbus_read_byte_data(client,
431 LM95231_REG_R_LOCAL_TEMPH);
432 if (data->local_h_st < 0)
433 data->local_h = 0;
434 else
435 data->local_h = data->local_h_st;
436
437 data->local_l_st = i2c_smbus_read_byte_data(client,
438 LM95231_REG_R_LOCAL_TEMPL);
439 if (data->local_l_st < 0)
440 data->local_l = 0;
441 else
442 data->local_l = data->local_l_st;
443
444 data->remote1_h_st = i2c_smbus_read_byte_data(client,
445 LM95231_REG_R_REMOTE1_TEMPH);
446 if (data->remote1_h_st < 0)
447 data->remote1_h = 0;
448 else
449 data->remote1_h = data->remote1_h_st;
450
451 data->remote1_l_st = i2c_smbus_read_byte_data(client,
452 LM95231_REG_R_REMOTE1_TEMPL);
453 if (data->remote1_l_st < 0)
454 data->remote1_l = 0;
455 else
456 data->remote1_l = (u8) data->remote1_l_st;
457
458 data->remote2_h_st = i2c_smbus_read_byte_data(client,
459 LM95231_REG_R_REMOTE2_TEMPH);
460 if (data->remote2_h_st < 0)
461 data->remote2_h = 0;
462 else
463 data->remote2_h = data->remote2_h_st;
464
465 data->remote2_l_st = i2c_smbus_read_byte_data(client,
466 LM95231_REG_R_REMOTE2_TEMPL);
467 if (data->remote2_l_st < 0)
468 data->remote2_l = 0;
469 else
470 data->remote2_l = data->remote2_l_st;
471
472 data->last_updated = jiffies;
473 data->valid = 1;
474 }
475
476 mutex_unlock(&data->update_lock);
477
478 return data;
479 }
480
481 /* Driver data (common to all clients) */
482 static const struct i2c_device_id lm95231_id[] = {
483 { "lm95231", 0 },
484 { }
485 };
486 MODULE_DEVICE_TABLE(i2c, lm95231_id);
487
488 static struct i2c_driver lm95231_driver = {
489 .class = I2C_CLASS_HWMON,
490 .driver = {
491 .name = "lm95231",
492 },
493 .probe = lm95231_probe,
494 .remove = lm95231_remove,
495 .id_table = lm95231_id,
496 .detect = lm95231_detect,
497 .address_list = normal_i2c,
498 };
499
500 static int __init sensors_lm95231_init(void)
501 {
502 return i2c_add_driver(&lm95231_driver);
503 }
504
505 static void __exit sensors_lm95231_exit(void)
506 {
507 i2c_del_driver(&lm95231_driver);
508 }
509
510 MODULE_AUTHOR("Evgeny Kravtsunov <kravtsunov_e@mcst.ru>");
511 MODULE_DESCRIPTION("LM95231 sensor driver");
512 MODULE_LICENSE("GPL");
513
514 module_init(sensors_lm95231_init);
515 module_exit(sensors_lm95231_exit);
Linux for the MCST Elbrus 2000 architecture