Commit | Line | Data |
---|---|---|
06160327 | 1 | /* |
0f1deb4b | 2 | * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com> |
06160327 | 3 | * |
0f1deb4b DR |
4 | * The LM95241 is a sensor chip made by National Semiconductors. |
5 | * It reports up to three temperatures (its own plus up to two external ones). | |
6 | * Complete datasheet can be obtained from National's website at: | |
06160327 DR |
7 | * http://www.national.com/ds.cgi/LM/LM95241.pdf |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/jiffies.h> | |
28 | #include <linux/i2c.h> | |
29 | #include <linux/hwmon.h> | |
30 | #include <linux/hwmon-sysfs.h> | |
31 | #include <linux/err.h> | |
32 | #include <linux/mutex.h> | |
33 | #include <linux/sysfs.h> | |
34 | ||
0f1deb4b DR |
35 | #define DEVNAME "lm95241" |
36 | ||
06160327 | 37 | static const unsigned short normal_i2c[] = { |
0f1deb4b | 38 | 0x19, 0x2a, 0x2b, I2C_CLIENT_END }; |
06160327 | 39 | |
06160327 DR |
40 | /* LM95241 registers */ |
41 | #define LM95241_REG_R_MAN_ID 0xFE | |
42 | #define LM95241_REG_R_CHIP_ID 0xFF | |
43 | #define LM95241_REG_R_STATUS 0x02 | |
44 | #define LM95241_REG_RW_CONFIG 0x03 | |
45 | #define LM95241_REG_RW_REM_FILTER 0x06 | |
46 | #define LM95241_REG_RW_TRUTHERM 0x07 | |
0f1deb4b | 47 | #define LM95241_REG_W_ONE_SHOT 0x0F |
06160327 DR |
48 | #define LM95241_REG_R_LOCAL_TEMPH 0x10 |
49 | #define LM95241_REG_R_REMOTE1_TEMPH 0x11 | |
50 | #define LM95241_REG_R_REMOTE2_TEMPH 0x12 | |
51 | #define LM95241_REG_R_LOCAL_TEMPL 0x20 | |
52 | #define LM95241_REG_R_REMOTE1_TEMPL 0x21 | |
53 | #define LM95241_REG_R_REMOTE2_TEMPL 0x22 | |
54 | #define LM95241_REG_RW_REMOTE_MODEL 0x30 | |
55 | ||
56 | /* LM95241 specific bitfields */ | |
57 | #define CFG_STOP 0x40 | |
58 | #define CFG_CR0076 0x00 | |
59 | #define CFG_CR0182 0x10 | |
60 | #define CFG_CR1000 0x20 | |
61 | #define CFG_CR2700 0x30 | |
62 | #define R1MS_SHIFT 0 | |
63 | #define R2MS_SHIFT 2 | |
64 | #define R1MS_MASK (0x01 << (R1MS_SHIFT)) | |
65 | #define R2MS_MASK (0x01 << (R2MS_SHIFT)) | |
66 | #define R1DF_SHIFT 1 | |
67 | #define R2DF_SHIFT 2 | |
68 | #define R1DF_MASK (0x01 << (R1DF_SHIFT)) | |
69 | #define R2DF_MASK (0x01 << (R2DF_SHIFT)) | |
70 | #define R1FE_MASK 0x01 | |
71 | #define R2FE_MASK 0x05 | |
72 | #define TT1_SHIFT 0 | |
73 | #define TT2_SHIFT 4 | |
74 | #define TT_OFF 0 | |
75 | #define TT_ON 1 | |
76 | #define TT_MASK 7 | |
77 | #define MANUFACTURER_ID 0x01 | |
78 | #define DEFAULT_REVISION 0xA4 | |
79 | ||
0f1deb4b DR |
80 | static const u8 lm95241_reg_address[] = { |
81 | LM95241_REG_R_LOCAL_TEMPH, | |
82 | LM95241_REG_R_LOCAL_TEMPL, | |
83 | LM95241_REG_R_REMOTE1_TEMPH, | |
84 | LM95241_REG_R_REMOTE1_TEMPL, | |
85 | LM95241_REG_R_REMOTE2_TEMPH, | |
86 | LM95241_REG_R_REMOTE2_TEMPL | |
87 | }; | |
06160327 | 88 | |
06160327 DR |
89 | /* Client data (each client gets its own) */ |
90 | struct lm95241_data { | |
06160327 DR |
91 | struct device *hwmon_dev; |
92 | struct mutex update_lock; | |
0f1deb4b DR |
93 | unsigned long last_updated, interval; /* in jiffies */ |
94 | char valid; /* zero until following fields are valid */ | |
06160327 | 95 | /* registers values */ |
0f1deb4b | 96 | u8 temp[ARRAY_SIZE(lm95241_reg_address)]; |
06160327 DR |
97 | u8 config, model, trutherm; |
98 | }; | |
99 | ||
0f1deb4b DR |
100 | /* Conversions */ |
101 | static int TempFromReg(u8 val_h, u8 val_l) | |
102 | { | |
103 | if (val_h & 0x80) | |
104 | return val_h - 0x100; | |
105 | return val_h * 1000 + val_l * 1000 / 256; | |
106 | } | |
107 | ||
108 | static struct lm95241_data *lm95241_update_device(struct device *dev) | |
109 | { | |
110 | struct i2c_client *client = to_i2c_client(dev); | |
111 | struct lm95241_data *data = i2c_get_clientdata(client); | |
112 | ||
113 | mutex_lock(&data->update_lock); | |
114 | ||
115 | if (time_after(jiffies, data->last_updated + data->interval) || | |
116 | !data->valid) { | |
117 | int i; | |
118 | ||
119 | dev_dbg(&client->dev, "Updating lm95241 data.\n"); | |
120 | for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++) | |
121 | data->temp[i] | |
122 | = i2c_smbus_read_byte_data(client, | |
123 | lm95241_reg_address[i]); | |
124 | data->last_updated = jiffies; | |
125 | data->valid = 1; | |
126 | } | |
127 | ||
128 | mutex_unlock(&data->update_lock); | |
129 | ||
130 | return data; | |
131 | } | |
132 | ||
06160327 | 133 | /* Sysfs stuff */ |
0f1deb4b DR |
134 | static ssize_t show_input(struct device *dev, struct device_attribute *attr, |
135 | char *buf) | |
136 | { | |
137 | struct lm95241_data *data = lm95241_update_device(dev); | |
138 | ||
139 | return snprintf(buf, PAGE_SIZE - 1, "%d\n", | |
140 | TempFromReg(data->temp[to_sensor_dev_attr(attr)->index], | |
141 | data->temp[to_sensor_dev_attr(attr)->index + 1])); | |
06160327 | 142 | } |
06160327 | 143 | |
0f1deb4b | 144 | static ssize_t show_type(struct device *dev, struct device_attribute *attr, |
06160327 DR |
145 | char *buf) |
146 | { | |
0f1deb4b DR |
147 | struct i2c_client *client = to_i2c_client(dev); |
148 | struct lm95241_data *data = i2c_get_clientdata(client); | |
06160327 | 149 | |
0f1deb4b DR |
150 | return snprintf(buf, PAGE_SIZE - 1, |
151 | data->model & to_sensor_dev_attr(attr)->index ? "1\n" : "2\n"); | |
06160327 DR |
152 | } |
153 | ||
0f1deb4b | 154 | static ssize_t set_type(struct device *dev, struct device_attribute *attr, |
06160327 DR |
155 | const char *buf, size_t count) |
156 | { | |
157 | struct i2c_client *client = to_i2c_client(dev); | |
158 | struct lm95241_data *data = i2c_get_clientdata(client); | |
61ec2da5 | 159 | unsigned long val; |
0f1deb4b DR |
160 | int shift; |
161 | u8 mask = to_sensor_dev_attr(attr)->index; | |
06160327 | 162 | |
61ec2da5 JD |
163 | if (strict_strtoul(buf, 10, &val) < 0) |
164 | return -EINVAL; | |
0f1deb4b DR |
165 | if (val != 1 && val != 2) |
166 | return -EINVAL; | |
61ec2da5 | 167 | |
0f1deb4b DR |
168 | shift = mask == R1MS_MASK ? TT1_SHIFT : TT2_SHIFT; |
169 | ||
170 | mutex_lock(&data->update_lock); | |
171 | ||
172 | data->trutherm &= ~(TT_MASK << shift); | |
173 | if (val == 1) { | |
174 | data->model |= mask; | |
175 | data->trutherm |= (TT_ON << shift); | |
176 | } else { | |
177 | data->model &= ~mask; | |
178 | data->trutherm |= (TT_OFF << shift); | |
179 | } | |
180 | data->valid = 0; | |
181 | ||
182 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL, | |
183 | data->model); | |
184 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM, | |
185 | data->trutherm); | |
186 | ||
187 | mutex_unlock(&data->update_lock); | |
06160327 DR |
188 | |
189 | return count; | |
190 | } | |
191 | ||
0f1deb4b DR |
192 | static ssize_t show_min(struct device *dev, struct device_attribute *attr, |
193 | char *buf) | |
194 | { | |
195 | struct i2c_client *client = to_i2c_client(dev); | |
196 | struct lm95241_data *data = i2c_get_clientdata(client); | |
197 | ||
198 | return snprintf(buf, PAGE_SIZE - 1, | |
199 | data->config & to_sensor_dev_attr(attr)->index ? | |
200 | "-127000\n" : "0\n"); | |
06160327 | 201 | } |
0f1deb4b DR |
202 | |
203 | static ssize_t set_min(struct device *dev, struct device_attribute *attr, | |
204 | const char *buf, size_t count) | |
205 | { | |
206 | struct i2c_client *client = to_i2c_client(dev); | |
207 | struct lm95241_data *data = i2c_get_clientdata(client); | |
208 | long val; | |
209 | ||
210 | if (strict_strtol(buf, 10, &val) < 0) | |
211 | return -EINVAL; | |
212 | if (val < -128000) | |
213 | return -EINVAL; | |
214 | ||
215 | mutex_lock(&data->update_lock); | |
216 | ||
217 | if (val < 0) | |
218 | data->config |= to_sensor_dev_attr(attr)->index; | |
219 | else | |
220 | data->config &= ~to_sensor_dev_attr(attr)->index; | |
221 | data->valid = 0; | |
222 | ||
223 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config); | |
224 | ||
225 | mutex_unlock(&data->update_lock); | |
226 | ||
227 | return count; | |
06160327 | 228 | } |
0f1deb4b DR |
229 | |
230 | static ssize_t show_max(struct device *dev, struct device_attribute *attr, | |
231 | char *buf) | |
232 | { | |
233 | struct i2c_client *client = to_i2c_client(dev); | |
234 | struct lm95241_data *data = i2c_get_clientdata(client); | |
235 | ||
236 | return snprintf(buf, PAGE_SIZE - 1, | |
237 | data->config & to_sensor_dev_attr(attr)->index ? | |
238 | "127000\n" : "255000\n"); | |
06160327 | 239 | } |
0f1deb4b DR |
240 | |
241 | static ssize_t set_max(struct device *dev, struct device_attribute *attr, | |
242 | const char *buf, size_t count) | |
243 | { | |
244 | struct i2c_client *client = to_i2c_client(dev); | |
245 | struct lm95241_data *data = i2c_get_clientdata(client); | |
246 | long val; | |
247 | ||
248 | if (strict_strtol(buf, 10, &val) < 0) | |
249 | return -EINVAL; | |
250 | if (val >= 256000) | |
251 | return -EINVAL; | |
252 | ||
253 | mutex_lock(&data->update_lock); | |
254 | ||
255 | if (val <= 127000) | |
256 | data->config |= to_sensor_dev_attr(attr)->index; | |
257 | else | |
258 | data->config &= ~to_sensor_dev_attr(attr)->index; | |
259 | data->valid = 0; | |
260 | ||
261 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config); | |
262 | ||
263 | mutex_unlock(&data->update_lock); | |
264 | ||
265 | return count; | |
06160327 | 266 | } |
0f1deb4b DR |
267 | |
268 | static ssize_t show_interval(struct device *dev, struct device_attribute *attr, | |
269 | char *buf) | |
270 | { | |
271 | struct lm95241_data *data = lm95241_update_device(dev); | |
272 | ||
273 | return snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->interval | |
274 | / HZ); | |
06160327 | 275 | } |
0f1deb4b DR |
276 | |
277 | static ssize_t set_interval(struct device *dev, struct device_attribute *attr, | |
278 | const char *buf, size_t count) | |
279 | { | |
280 | struct i2c_client *client = to_i2c_client(dev); | |
281 | struct lm95241_data *data = i2c_get_clientdata(client); | |
282 | unsigned long val; | |
283 | ||
284 | if (strict_strtoul(buf, 10, &val) < 0) | |
285 | return -EINVAL; | |
286 | ||
287 | data->interval = val * HZ / 1000; | |
288 | ||
289 | return count; | |
06160327 | 290 | } |
0f1deb4b DR |
291 | |
292 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0); | |
293 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2); | |
294 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4); | |
295 | static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type, | |
296 | R1MS_MASK); | |
297 | static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type, | |
298 | R2MS_MASK); | |
299 | static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min, set_min, | |
300 | R1DF_MASK); | |
301 | static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min, set_min, | |
302 | R2DF_MASK); | |
303 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max, set_max, | |
304 | R1DF_MASK); | |
305 | static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max, set_max, | |
306 | R2DF_MASK); | |
bc482bf0 GR |
307 | static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval, |
308 | set_interval); | |
06160327 DR |
309 | |
310 | static struct attribute *lm95241_attributes[] = { | |
0f1deb4b DR |
311 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
312 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
313 | &sensor_dev_attr_temp3_input.dev_attr.attr, | |
314 | &sensor_dev_attr_temp2_type.dev_attr.attr, | |
315 | &sensor_dev_attr_temp3_type.dev_attr.attr, | |
316 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
317 | &sensor_dev_attr_temp3_min.dev_attr.attr, | |
318 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
319 | &sensor_dev_attr_temp3_max.dev_attr.attr, | |
bc482bf0 | 320 | &dev_attr_update_interval.attr, |
06160327 DR |
321 | NULL |
322 | }; | |
323 | ||
324 | static const struct attribute_group lm95241_group = { | |
325 | .attrs = lm95241_attributes, | |
326 | }; | |
327 | ||
797eaa4b | 328 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 329 | static int lm95241_detect(struct i2c_client *new_client, |
797eaa4b | 330 | struct i2c_board_info *info) |
06160327 | 331 | { |
797eaa4b JD |
332 | struct i2c_adapter *adapter = new_client->adapter; |
333 | int address = new_client->addr; | |
52df6440 | 334 | const char *name; |
06160327 DR |
335 | |
336 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
797eaa4b | 337 | return -ENODEV; |
06160327 | 338 | |
52df6440 JD |
339 | if ((i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID) |
340 | == MANUFACTURER_ID) | |
0f1deb4b DR |
341 | && (i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID) |
342 | >= DEFAULT_REVISION)) { | |
343 | name = DEVNAME; | |
52df6440 JD |
344 | } else { |
345 | dev_dbg(&adapter->dev, "LM95241 detection failed at 0x%02x\n", | |
346 | address); | |
347 | return -ENODEV; | |
06160327 DR |
348 | } |
349 | ||
797eaa4b | 350 | /* Fill the i2c board info */ |
797eaa4b JD |
351 | strlcpy(info->type, name, I2C_NAME_SIZE); |
352 | return 0; | |
353 | } | |
06160327 | 354 | |
0f1deb4b DR |
355 | static void lm95241_init_client(struct i2c_client *client) |
356 | { | |
357 | struct lm95241_data *data = i2c_get_clientdata(client); | |
358 | ||
359 | data->interval = HZ; /* 1 sec default */ | |
360 | data->valid = 0; | |
361 | data->config = CFG_CR0076; | |
362 | data->model = 0; | |
363 | data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT); | |
364 | ||
365 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config); | |
366 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER, | |
367 | R1FE_MASK | R2FE_MASK); | |
368 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM, | |
369 | data->trutherm); | |
370 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL, | |
371 | data->model); | |
372 | } | |
373 | ||
797eaa4b JD |
374 | static int lm95241_probe(struct i2c_client *new_client, |
375 | const struct i2c_device_id *id) | |
376 | { | |
377 | struct lm95241_data *data; | |
378 | int err; | |
06160327 | 379 | |
797eaa4b JD |
380 | data = kzalloc(sizeof(struct lm95241_data), GFP_KERNEL); |
381 | if (!data) { | |
382 | err = -ENOMEM; | |
383 | goto exit; | |
384 | } | |
385 | ||
386 | i2c_set_clientdata(new_client, data); | |
387 | mutex_init(&data->update_lock); | |
06160327 DR |
388 | |
389 | /* Initialize the LM95241 chip */ | |
390 | lm95241_init_client(new_client); | |
391 | ||
392 | /* Register sysfs hooks */ | |
393 | err = sysfs_create_group(&new_client->dev.kobj, &lm95241_group); | |
394 | if (err) | |
797eaa4b | 395 | goto exit_free; |
06160327 DR |
396 | |
397 | data->hwmon_dev = hwmon_device_register(&new_client->dev); | |
398 | if (IS_ERR(data->hwmon_dev)) { | |
399 | err = PTR_ERR(data->hwmon_dev); | |
400 | goto exit_remove_files; | |
401 | } | |
402 | ||
403 | return 0; | |
404 | ||
405 | exit_remove_files: | |
406 | sysfs_remove_group(&new_client->dev.kobj, &lm95241_group); | |
06160327 DR |
407 | exit_free: |
408 | kfree(data); | |
409 | exit: | |
410 | return err; | |
411 | } | |
412 | ||
797eaa4b | 413 | static int lm95241_remove(struct i2c_client *client) |
06160327 DR |
414 | { |
415 | struct lm95241_data *data = i2c_get_clientdata(client); | |
06160327 DR |
416 | |
417 | hwmon_device_unregister(data->hwmon_dev); | |
418 | sysfs_remove_group(&client->dev.kobj, &lm95241_group); | |
419 | ||
06160327 DR |
420 | kfree(data); |
421 | return 0; | |
422 | } | |
423 | ||
797eaa4b JD |
424 | /* Driver data (common to all clients) */ |
425 | static const struct i2c_device_id lm95241_id[] = { | |
0f1deb4b | 426 | { DEVNAME, 0 }, |
797eaa4b JD |
427 | { } |
428 | }; | |
429 | MODULE_DEVICE_TABLE(i2c, lm95241_id); | |
430 | ||
431 | static struct i2c_driver lm95241_driver = { | |
432 | .class = I2C_CLASS_HWMON, | |
433 | .driver = { | |
0f1deb4b | 434 | .name = DEVNAME, |
797eaa4b JD |
435 | }, |
436 | .probe = lm95241_probe, | |
437 | .remove = lm95241_remove, | |
438 | .id_table = lm95241_id, | |
439 | .detect = lm95241_detect, | |
c3813d6a | 440 | .address_list = normal_i2c, |
797eaa4b JD |
441 | }; |
442 | ||
06160327 DR |
443 | static int __init sensors_lm95241_init(void) |
444 | { | |
445 | return i2c_add_driver(&lm95241_driver); | |
446 | } | |
447 | ||
448 | static void __exit sensors_lm95241_exit(void) | |
449 | { | |
450 | i2c_del_driver(&lm95241_driver); | |
451 | } | |
452 | ||
0f1deb4b | 453 | MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>"); |
06160327 DR |
454 | MODULE_DESCRIPTION("LM95241 sensor driver"); |
455 | MODULE_LICENSE("GPL"); | |
456 | ||
457 | module_init(sensors_lm95241_init); | |
458 | module_exit(sensors_lm95241_exit); |