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 | 100 | /* Conversions */ |
0c2a40e2 | 101 | static int temp_from_reg_signed(u8 val_h, u8 val_l) |
0f1deb4b | 102 | { |
0c2a40e2 GR |
103 | s16 val_hl = (val_h << 8) | val_l; |
104 | return val_hl * 1000 / 256; | |
105 | } | |
106 | ||
107 | static int temp_from_reg_unsigned(u8 val_h, u8 val_l) | |
108 | { | |
109 | u16 val_hl = (val_h << 8) | val_l; | |
110 | return val_hl * 1000 / 256; | |
0f1deb4b DR |
111 | } |
112 | ||
113 | static struct lm95241_data *lm95241_update_device(struct device *dev) | |
114 | { | |
115 | struct i2c_client *client = to_i2c_client(dev); | |
116 | struct lm95241_data *data = i2c_get_clientdata(client); | |
117 | ||
118 | mutex_lock(&data->update_lock); | |
119 | ||
120 | if (time_after(jiffies, data->last_updated + data->interval) || | |
121 | !data->valid) { | |
122 | int i; | |
123 | ||
124 | dev_dbg(&client->dev, "Updating lm95241 data.\n"); | |
125 | for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++) | |
126 | data->temp[i] | |
127 | = i2c_smbus_read_byte_data(client, | |
128 | lm95241_reg_address[i]); | |
129 | data->last_updated = jiffies; | |
130 | data->valid = 1; | |
131 | } | |
132 | ||
133 | mutex_unlock(&data->update_lock); | |
134 | ||
135 | return data; | |
136 | } | |
137 | ||
06160327 | 138 | /* Sysfs stuff */ |
0f1deb4b DR |
139 | static ssize_t show_input(struct device *dev, struct device_attribute *attr, |
140 | char *buf) | |
141 | { | |
142 | struct lm95241_data *data = lm95241_update_device(dev); | |
0c2a40e2 | 143 | int index = to_sensor_dev_attr(attr)->index; |
0f1deb4b DR |
144 | |
145 | return snprintf(buf, PAGE_SIZE - 1, "%d\n", | |
0c2a40e2 GR |
146 | index == 0 || (data->config & (1 << (index / 2))) ? |
147 | temp_from_reg_signed(data->temp[index], data->temp[index + 1]) : | |
148 | temp_from_reg_unsigned(data->temp[index], | |
149 | data->temp[index + 1])); | |
06160327 | 150 | } |
06160327 | 151 | |
0f1deb4b | 152 | static ssize_t show_type(struct device *dev, struct device_attribute *attr, |
06160327 DR |
153 | char *buf) |
154 | { | |
0f1deb4b DR |
155 | struct i2c_client *client = to_i2c_client(dev); |
156 | struct lm95241_data *data = i2c_get_clientdata(client); | |
06160327 | 157 | |
0f1deb4b DR |
158 | return snprintf(buf, PAGE_SIZE - 1, |
159 | data->model & to_sensor_dev_attr(attr)->index ? "1\n" : "2\n"); | |
06160327 DR |
160 | } |
161 | ||
0f1deb4b | 162 | static ssize_t set_type(struct device *dev, struct device_attribute *attr, |
06160327 DR |
163 | const char *buf, size_t count) |
164 | { | |
165 | struct i2c_client *client = to_i2c_client(dev); | |
166 | struct lm95241_data *data = i2c_get_clientdata(client); | |
61ec2da5 | 167 | unsigned long val; |
0f1deb4b DR |
168 | int shift; |
169 | u8 mask = to_sensor_dev_attr(attr)->index; | |
06160327 | 170 | |
61ec2da5 JD |
171 | if (strict_strtoul(buf, 10, &val) < 0) |
172 | return -EINVAL; | |
0f1deb4b DR |
173 | if (val != 1 && val != 2) |
174 | return -EINVAL; | |
61ec2da5 | 175 | |
0f1deb4b DR |
176 | shift = mask == R1MS_MASK ? TT1_SHIFT : TT2_SHIFT; |
177 | ||
178 | mutex_lock(&data->update_lock); | |
179 | ||
180 | data->trutherm &= ~(TT_MASK << shift); | |
181 | if (val == 1) { | |
182 | data->model |= mask; | |
183 | data->trutherm |= (TT_ON << shift); | |
184 | } else { | |
185 | data->model &= ~mask; | |
186 | data->trutherm |= (TT_OFF << shift); | |
187 | } | |
188 | data->valid = 0; | |
189 | ||
190 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL, | |
191 | data->model); | |
192 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM, | |
193 | data->trutherm); | |
194 | ||
195 | mutex_unlock(&data->update_lock); | |
06160327 DR |
196 | |
197 | return count; | |
198 | } | |
199 | ||
0f1deb4b DR |
200 | static ssize_t show_min(struct device *dev, struct device_attribute *attr, |
201 | char *buf) | |
202 | { | |
203 | struct i2c_client *client = to_i2c_client(dev); | |
204 | struct lm95241_data *data = i2c_get_clientdata(client); | |
205 | ||
206 | return snprintf(buf, PAGE_SIZE - 1, | |
207 | data->config & to_sensor_dev_attr(attr)->index ? | |
208 | "-127000\n" : "0\n"); | |
06160327 | 209 | } |
0f1deb4b DR |
210 | |
211 | static ssize_t set_min(struct device *dev, struct device_attribute *attr, | |
212 | const char *buf, size_t count) | |
213 | { | |
214 | struct i2c_client *client = to_i2c_client(dev); | |
215 | struct lm95241_data *data = i2c_get_clientdata(client); | |
216 | long val; | |
217 | ||
218 | if (strict_strtol(buf, 10, &val) < 0) | |
219 | return -EINVAL; | |
220 | if (val < -128000) | |
221 | return -EINVAL; | |
222 | ||
223 | mutex_lock(&data->update_lock); | |
224 | ||
225 | if (val < 0) | |
226 | data->config |= to_sensor_dev_attr(attr)->index; | |
227 | else | |
228 | data->config &= ~to_sensor_dev_attr(attr)->index; | |
229 | data->valid = 0; | |
230 | ||
231 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config); | |
232 | ||
233 | mutex_unlock(&data->update_lock); | |
234 | ||
235 | return count; | |
06160327 | 236 | } |
0f1deb4b DR |
237 | |
238 | static ssize_t show_max(struct device *dev, struct device_attribute *attr, | |
239 | char *buf) | |
240 | { | |
241 | struct i2c_client *client = to_i2c_client(dev); | |
242 | struct lm95241_data *data = i2c_get_clientdata(client); | |
243 | ||
244 | return snprintf(buf, PAGE_SIZE - 1, | |
245 | data->config & to_sensor_dev_attr(attr)->index ? | |
246 | "127000\n" : "255000\n"); | |
06160327 | 247 | } |
0f1deb4b DR |
248 | |
249 | static ssize_t set_max(struct device *dev, struct device_attribute *attr, | |
250 | const char *buf, size_t count) | |
251 | { | |
252 | struct i2c_client *client = to_i2c_client(dev); | |
253 | struct lm95241_data *data = i2c_get_clientdata(client); | |
254 | long val; | |
255 | ||
256 | if (strict_strtol(buf, 10, &val) < 0) | |
257 | return -EINVAL; | |
258 | if (val >= 256000) | |
259 | return -EINVAL; | |
260 | ||
261 | mutex_lock(&data->update_lock); | |
262 | ||
263 | if (val <= 127000) | |
264 | data->config |= to_sensor_dev_attr(attr)->index; | |
265 | else | |
266 | data->config &= ~to_sensor_dev_attr(attr)->index; | |
267 | data->valid = 0; | |
268 | ||
269 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config); | |
270 | ||
271 | mutex_unlock(&data->update_lock); | |
272 | ||
273 | return count; | |
06160327 | 274 | } |
0f1deb4b DR |
275 | |
276 | static ssize_t show_interval(struct device *dev, struct device_attribute *attr, | |
277 | char *buf) | |
278 | { | |
279 | struct lm95241_data *data = lm95241_update_device(dev); | |
280 | ||
281 | return snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->interval | |
282 | / HZ); | |
06160327 | 283 | } |
0f1deb4b DR |
284 | |
285 | static ssize_t set_interval(struct device *dev, struct device_attribute *attr, | |
286 | const char *buf, size_t count) | |
287 | { | |
288 | struct i2c_client *client = to_i2c_client(dev); | |
289 | struct lm95241_data *data = i2c_get_clientdata(client); | |
290 | unsigned long val; | |
291 | ||
292 | if (strict_strtoul(buf, 10, &val) < 0) | |
293 | return -EINVAL; | |
294 | ||
295 | data->interval = val * HZ / 1000; | |
296 | ||
297 | return count; | |
06160327 | 298 | } |
0f1deb4b DR |
299 | |
300 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0); | |
301 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2); | |
302 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4); | |
303 | static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type, | |
304 | R1MS_MASK); | |
305 | static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type, | |
306 | R2MS_MASK); | |
307 | static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min, set_min, | |
308 | R1DF_MASK); | |
309 | static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min, set_min, | |
310 | R2DF_MASK); | |
311 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max, set_max, | |
312 | R1DF_MASK); | |
313 | static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max, set_max, | |
314 | R2DF_MASK); | |
bc482bf0 GR |
315 | static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval, |
316 | set_interval); | |
06160327 DR |
317 | |
318 | static struct attribute *lm95241_attributes[] = { | |
0f1deb4b DR |
319 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
320 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
321 | &sensor_dev_attr_temp3_input.dev_attr.attr, | |
322 | &sensor_dev_attr_temp2_type.dev_attr.attr, | |
323 | &sensor_dev_attr_temp3_type.dev_attr.attr, | |
324 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
325 | &sensor_dev_attr_temp3_min.dev_attr.attr, | |
326 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
327 | &sensor_dev_attr_temp3_max.dev_attr.attr, | |
bc482bf0 | 328 | &dev_attr_update_interval.attr, |
06160327 DR |
329 | NULL |
330 | }; | |
331 | ||
332 | static const struct attribute_group lm95241_group = { | |
333 | .attrs = lm95241_attributes, | |
334 | }; | |
335 | ||
797eaa4b | 336 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 337 | static int lm95241_detect(struct i2c_client *new_client, |
797eaa4b | 338 | struct i2c_board_info *info) |
06160327 | 339 | { |
797eaa4b JD |
340 | struct i2c_adapter *adapter = new_client->adapter; |
341 | int address = new_client->addr; | |
52df6440 | 342 | const char *name; |
06160327 DR |
343 | |
344 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
797eaa4b | 345 | return -ENODEV; |
06160327 | 346 | |
52df6440 JD |
347 | if ((i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID) |
348 | == MANUFACTURER_ID) | |
0f1deb4b | 349 | && (i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID) |
27739e69 | 350 | == DEFAULT_REVISION)) { |
0f1deb4b | 351 | name = DEVNAME; |
52df6440 JD |
352 | } else { |
353 | dev_dbg(&adapter->dev, "LM95241 detection failed at 0x%02x\n", | |
354 | address); | |
355 | return -ENODEV; | |
06160327 DR |
356 | } |
357 | ||
797eaa4b | 358 | /* Fill the i2c board info */ |
797eaa4b JD |
359 | strlcpy(info->type, name, I2C_NAME_SIZE); |
360 | return 0; | |
361 | } | |
06160327 | 362 | |
0f1deb4b DR |
363 | static void lm95241_init_client(struct i2c_client *client) |
364 | { | |
365 | struct lm95241_data *data = i2c_get_clientdata(client); | |
366 | ||
367 | data->interval = HZ; /* 1 sec default */ | |
368 | data->valid = 0; | |
369 | data->config = CFG_CR0076; | |
370 | data->model = 0; | |
371 | data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT); | |
372 | ||
373 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config); | |
374 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER, | |
375 | R1FE_MASK | R2FE_MASK); | |
376 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM, | |
377 | data->trutherm); | |
378 | i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL, | |
379 | data->model); | |
380 | } | |
381 | ||
797eaa4b JD |
382 | static int lm95241_probe(struct i2c_client *new_client, |
383 | const struct i2c_device_id *id) | |
384 | { | |
385 | struct lm95241_data *data; | |
386 | int err; | |
06160327 | 387 | |
797eaa4b JD |
388 | data = kzalloc(sizeof(struct lm95241_data), GFP_KERNEL); |
389 | if (!data) { | |
390 | err = -ENOMEM; | |
391 | goto exit; | |
392 | } | |
393 | ||
394 | i2c_set_clientdata(new_client, data); | |
395 | mutex_init(&data->update_lock); | |
06160327 DR |
396 | |
397 | /* Initialize the LM95241 chip */ | |
398 | lm95241_init_client(new_client); | |
399 | ||
400 | /* Register sysfs hooks */ | |
401 | err = sysfs_create_group(&new_client->dev.kobj, &lm95241_group); | |
402 | if (err) | |
797eaa4b | 403 | goto exit_free; |
06160327 DR |
404 | |
405 | data->hwmon_dev = hwmon_device_register(&new_client->dev); | |
406 | if (IS_ERR(data->hwmon_dev)) { | |
407 | err = PTR_ERR(data->hwmon_dev); | |
408 | goto exit_remove_files; | |
409 | } | |
410 | ||
411 | return 0; | |
412 | ||
413 | exit_remove_files: | |
414 | sysfs_remove_group(&new_client->dev.kobj, &lm95241_group); | |
06160327 DR |
415 | exit_free: |
416 | kfree(data); | |
417 | exit: | |
418 | return err; | |
419 | } | |
420 | ||
797eaa4b | 421 | static int lm95241_remove(struct i2c_client *client) |
06160327 DR |
422 | { |
423 | struct lm95241_data *data = i2c_get_clientdata(client); | |
06160327 DR |
424 | |
425 | hwmon_device_unregister(data->hwmon_dev); | |
426 | sysfs_remove_group(&client->dev.kobj, &lm95241_group); | |
427 | ||
06160327 DR |
428 | kfree(data); |
429 | return 0; | |
430 | } | |
431 | ||
797eaa4b JD |
432 | /* Driver data (common to all clients) */ |
433 | static const struct i2c_device_id lm95241_id[] = { | |
0f1deb4b | 434 | { DEVNAME, 0 }, |
797eaa4b JD |
435 | { } |
436 | }; | |
437 | MODULE_DEVICE_TABLE(i2c, lm95241_id); | |
438 | ||
439 | static struct i2c_driver lm95241_driver = { | |
440 | .class = I2C_CLASS_HWMON, | |
441 | .driver = { | |
0f1deb4b | 442 | .name = DEVNAME, |
797eaa4b JD |
443 | }, |
444 | .probe = lm95241_probe, | |
445 | .remove = lm95241_remove, | |
446 | .id_table = lm95241_id, | |
447 | .detect = lm95241_detect, | |
c3813d6a | 448 | .address_list = normal_i2c, |
797eaa4b JD |
449 | }; |
450 | ||
06160327 DR |
451 | static int __init sensors_lm95241_init(void) |
452 | { | |
453 | return i2c_add_driver(&lm95241_driver); | |
454 | } | |
455 | ||
456 | static void __exit sensors_lm95241_exit(void) | |
457 | { | |
458 | i2c_del_driver(&lm95241_driver); | |
459 | } | |
460 | ||
0f1deb4b | 461 | MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>"); |
06160327 DR |
462 | MODULE_DESCRIPTION("LM95241 sensor driver"); |
463 | MODULE_LICENSE("GPL"); | |
464 | ||
465 | module_init(sensors_lm95241_init); | |
466 | module_exit(sensors_lm95241_exit); |