lm95234.c 20 KB

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  1. /*
  2. * Driver for Texas Instruments / National Semiconductor LM95234
  3. *
  4. * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
  5. *
  6. * Derived from lm95241.c
  7. * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
  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. #include <linux/module.h>
  20. #include <linux/init.h>
  21. #include <linux/slab.h>
  22. #include <linux/jiffies.h>
  23. #include <linux/i2c.h>
  24. #include <linux/hwmon.h>
  25. #include <linux/hwmon-sysfs.h>
  26. #include <linux/err.h>
  27. #include <linux/mutex.h>
  28. #include <linux/sysfs.h>
  29. #define DRVNAME "lm95234"
  30. static const unsigned short normal_i2c[] = { 0x18, 0x4d, 0x4e, I2C_CLIENT_END };
  31. /* LM95234 registers */
  32. #define LM95234_REG_MAN_ID 0xFE
  33. #define LM95234_REG_CHIP_ID 0xFF
  34. #define LM95234_REG_STATUS 0x02
  35. #define LM95234_REG_CONFIG 0x03
  36. #define LM95234_REG_CONVRATE 0x04
  37. #define LM95234_REG_STS_FAULT 0x07
  38. #define LM95234_REG_STS_TCRIT1 0x08
  39. #define LM95234_REG_STS_TCRIT2 0x09
  40. #define LM95234_REG_TEMPH(x) ((x) + 0x10)
  41. #define LM95234_REG_TEMPL(x) ((x) + 0x20)
  42. #define LM95234_REG_UTEMPH(x) ((x) + 0x19) /* Remote only */
  43. #define LM95234_REG_UTEMPL(x) ((x) + 0x29)
  44. #define LM95234_REG_REM_MODEL 0x30
  45. #define LM95234_REG_REM_MODEL_STS 0x38
  46. #define LM95234_REG_OFFSET(x) ((x) + 0x31) /* Remote only */
  47. #define LM95234_REG_TCRIT1(x) ((x) + 0x40)
  48. #define LM95234_REG_TCRIT2(x) ((x) + 0x49) /* Remote channel 1,2 */
  49. #define LM95234_REG_TCRIT_HYST 0x5a
  50. #define NATSEMI_MAN_ID 0x01
  51. #define LM95234_CHIP_ID 0x79
  52. /* Client data (each client gets its own) */
  53. struct lm95234_data {
  54. struct i2c_client *client;
  55. struct mutex update_lock;
  56. unsigned long last_updated, interval; /* in jiffies */
  57. bool valid; /* false until following fields are valid */
  58. /* registers values */
  59. int temp[5]; /* temperature (signed) */
  60. u32 status; /* fault/alarm status */
  61. u8 tcrit1[5]; /* critical temperature limit */
  62. u8 tcrit2[2]; /* high temperature limit */
  63. s8 toffset[4]; /* remote temperature offset */
  64. u8 thyst; /* common hysteresis */
  65. u8 sensor_type; /* temperature sensor type */
  66. };
  67. static int lm95234_read_temp(struct i2c_client *client, int index, int *t)
  68. {
  69. int val;
  70. u16 temp = 0;
  71. if (index) {
  72. val = i2c_smbus_read_byte_data(client,
  73. LM95234_REG_UTEMPH(index - 1));
  74. if (val < 0)
  75. return val;
  76. temp = val << 8;
  77. val = i2c_smbus_read_byte_data(client,
  78. LM95234_REG_UTEMPL(index - 1));
  79. if (val < 0)
  80. return val;
  81. temp |= val;
  82. *t = temp;
  83. }
  84. /*
  85. * Read signed temperature if unsigned temperature is 0,
  86. * or if this is the local sensor.
  87. */
  88. if (!temp) {
  89. val = i2c_smbus_read_byte_data(client,
  90. LM95234_REG_TEMPH(index));
  91. if (val < 0)
  92. return val;
  93. temp = val << 8;
  94. val = i2c_smbus_read_byte_data(client,
  95. LM95234_REG_TEMPL(index));
  96. if (val < 0)
  97. return val;
  98. temp |= val;
  99. *t = (s16)temp;
  100. }
  101. return 0;
  102. }
  103. static u16 update_intervals[] = { 143, 364, 1000, 2500 };
  104. /* Fill value cache. Must be called with update lock held. */
  105. static int lm95234_fill_cache(struct lm95234_data *data,
  106. struct i2c_client *client)
  107. {
  108. int i, ret;
  109. ret = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
  110. if (ret < 0)
  111. return ret;
  112. data->interval = msecs_to_jiffies(update_intervals[ret & 0x03]);
  113. for (i = 0; i < ARRAY_SIZE(data->tcrit1); i++) {
  114. ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT1(i));
  115. if (ret < 0)
  116. return ret;
  117. data->tcrit1[i] = ret;
  118. }
  119. for (i = 0; i < ARRAY_SIZE(data->tcrit2); i++) {
  120. ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT2(i));
  121. if (ret < 0)
  122. return ret;
  123. data->tcrit2[i] = ret;
  124. }
  125. for (i = 0; i < ARRAY_SIZE(data->toffset); i++) {
  126. ret = i2c_smbus_read_byte_data(client, LM95234_REG_OFFSET(i));
  127. if (ret < 0)
  128. return ret;
  129. data->toffset[i] = ret;
  130. }
  131. ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT_HYST);
  132. if (ret < 0)
  133. return ret;
  134. data->thyst = ret;
  135. ret = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
  136. if (ret < 0)
  137. return ret;
  138. data->sensor_type = ret;
  139. return 0;
  140. }
  141. static int lm95234_update_device(struct lm95234_data *data)
  142. {
  143. struct i2c_client *client = data->client;
  144. int ret;
  145. mutex_lock(&data->update_lock);
  146. if (time_after(jiffies, data->last_updated + data->interval) ||
  147. !data->valid) {
  148. int i;
  149. if (!data->valid) {
  150. ret = lm95234_fill_cache(data, client);
  151. if (ret < 0)
  152. goto abort;
  153. }
  154. data->valid = false;
  155. for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
  156. ret = lm95234_read_temp(client, i, &data->temp[i]);
  157. if (ret < 0)
  158. goto abort;
  159. }
  160. ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_FAULT);
  161. if (ret < 0)
  162. goto abort;
  163. data->status = ret;
  164. ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT1);
  165. if (ret < 0)
  166. goto abort;
  167. data->status |= ret << 8;
  168. ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT2);
  169. if (ret < 0)
  170. goto abort;
  171. data->status |= ret << 16;
  172. data->last_updated = jiffies;
  173. data->valid = true;
  174. }
  175. ret = 0;
  176. abort:
  177. mutex_unlock(&data->update_lock);
  178. return ret;
  179. }
  180. static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
  181. char *buf)
  182. {
  183. struct lm95234_data *data = dev_get_drvdata(dev);
  184. int index = to_sensor_dev_attr(attr)->index;
  185. int ret = lm95234_update_device(data);
  186. if (ret)
  187. return ret;
  188. return sprintf(buf, "%d\n",
  189. DIV_ROUND_CLOSEST(data->temp[index] * 125, 32));
  190. }
  191. static ssize_t show_alarm(struct device *dev,
  192. struct device_attribute *attr, char *buf)
  193. {
  194. struct lm95234_data *data = dev_get_drvdata(dev);
  195. u32 mask = to_sensor_dev_attr(attr)->index;
  196. int ret = lm95234_update_device(data);
  197. if (ret)
  198. return ret;
  199. return sprintf(buf, "%u", !!(data->status & mask));
  200. }
  201. static ssize_t show_type(struct device *dev, struct device_attribute *attr,
  202. char *buf)
  203. {
  204. struct lm95234_data *data = dev_get_drvdata(dev);
  205. u8 mask = to_sensor_dev_attr(attr)->index;
  206. int ret = lm95234_update_device(data);
  207. if (ret)
  208. return ret;
  209. return sprintf(buf, data->sensor_type & mask ? "1\n" : "2\n");
  210. }
  211. static ssize_t set_type(struct device *dev, struct device_attribute *attr,
  212. const char *buf, size_t count)
  213. {
  214. struct lm95234_data *data = dev_get_drvdata(dev);
  215. unsigned long val;
  216. u8 mask = to_sensor_dev_attr(attr)->index;
  217. int ret = lm95234_update_device(data);
  218. if (ret)
  219. return ret;
  220. ret = kstrtoul(buf, 10, &val);
  221. if (ret < 0)
  222. return ret;
  223. if (val != 1 && val != 2)
  224. return -EINVAL;
  225. mutex_lock(&data->update_lock);
  226. if (val == 1)
  227. data->sensor_type |= mask;
  228. else
  229. data->sensor_type &= ~mask;
  230. data->valid = false;
  231. i2c_smbus_write_byte_data(data->client, LM95234_REG_REM_MODEL,
  232. data->sensor_type);
  233. mutex_unlock(&data->update_lock);
  234. return count;
  235. }
  236. static ssize_t show_tcrit2(struct device *dev, struct device_attribute *attr,
  237. char *buf)
  238. {
  239. struct lm95234_data *data = dev_get_drvdata(dev);
  240. int index = to_sensor_dev_attr(attr)->index;
  241. int ret = lm95234_update_device(data);
  242. if (ret)
  243. return ret;
  244. return sprintf(buf, "%u", data->tcrit2[index] * 1000);
  245. }
  246. static ssize_t set_tcrit2(struct device *dev, struct device_attribute *attr,
  247. const char *buf, size_t count)
  248. {
  249. struct lm95234_data *data = dev_get_drvdata(dev);
  250. int index = to_sensor_dev_attr(attr)->index;
  251. long val;
  252. int ret = lm95234_update_device(data);
  253. if (ret)
  254. return ret;
  255. ret = kstrtol(buf, 10, &val);
  256. if (ret < 0)
  257. return ret;
  258. val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, index ? 255 : 127);
  259. mutex_lock(&data->update_lock);
  260. data->tcrit2[index] = val;
  261. i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT2(index), val);
  262. mutex_unlock(&data->update_lock);
  263. return count;
  264. }
  265. static ssize_t show_tcrit2_hyst(struct device *dev,
  266. struct device_attribute *attr, char *buf)
  267. {
  268. struct lm95234_data *data = dev_get_drvdata(dev);
  269. int index = to_sensor_dev_attr(attr)->index;
  270. int ret = lm95234_update_device(data);
  271. if (ret)
  272. return ret;
  273. /* Result can be negative, so be careful with unsigned operands */
  274. return sprintf(buf, "%d",
  275. ((int)data->tcrit2[index] - (int)data->thyst) * 1000);
  276. }
  277. static ssize_t show_tcrit1(struct device *dev, struct device_attribute *attr,
  278. char *buf)
  279. {
  280. struct lm95234_data *data = dev_get_drvdata(dev);
  281. int index = to_sensor_dev_attr(attr)->index;
  282. return sprintf(buf, "%u", data->tcrit1[index] * 1000);
  283. }
  284. static ssize_t set_tcrit1(struct device *dev, struct device_attribute *attr,
  285. const char *buf, size_t count)
  286. {
  287. struct lm95234_data *data = dev_get_drvdata(dev);
  288. int index = to_sensor_dev_attr(attr)->index;
  289. int ret = lm95234_update_device(data);
  290. long val;
  291. if (ret)
  292. return ret;
  293. ret = kstrtol(buf, 10, &val);
  294. if (ret < 0)
  295. return ret;
  296. val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255);
  297. mutex_lock(&data->update_lock);
  298. data->tcrit1[index] = val;
  299. i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT1(index), val);
  300. mutex_unlock(&data->update_lock);
  301. return count;
  302. }
  303. static ssize_t show_tcrit1_hyst(struct device *dev,
  304. struct device_attribute *attr, char *buf)
  305. {
  306. struct lm95234_data *data = dev_get_drvdata(dev);
  307. int index = to_sensor_dev_attr(attr)->index;
  308. int ret = lm95234_update_device(data);
  309. if (ret)
  310. return ret;
  311. /* Result can be negative, so be careful with unsigned operands */
  312. return sprintf(buf, "%d",
  313. ((int)data->tcrit1[index] - (int)data->thyst) * 1000);
  314. }
  315. static ssize_t set_tcrit1_hyst(struct device *dev,
  316. struct device_attribute *attr,
  317. const char *buf, size_t count)
  318. {
  319. struct lm95234_data *data = dev_get_drvdata(dev);
  320. int index = to_sensor_dev_attr(attr)->index;
  321. int ret = lm95234_update_device(data);
  322. long val;
  323. if (ret)
  324. return ret;
  325. ret = kstrtol(buf, 10, &val);
  326. if (ret < 0)
  327. return ret;
  328. val = DIV_ROUND_CLOSEST(val, 1000);
  329. val = clamp_val((int)data->tcrit1[index] - val, 0, 31);
  330. mutex_lock(&data->update_lock);
  331. data->thyst = val;
  332. i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT_HYST, val);
  333. mutex_unlock(&data->update_lock);
  334. return count;
  335. }
  336. static ssize_t show_offset(struct device *dev, struct device_attribute *attr,
  337. char *buf)
  338. {
  339. struct lm95234_data *data = dev_get_drvdata(dev);
  340. int index = to_sensor_dev_attr(attr)->index;
  341. int ret = lm95234_update_device(data);
  342. if (ret)
  343. return ret;
  344. return sprintf(buf, "%d", data->toffset[index] * 500);
  345. }
  346. static ssize_t set_offset(struct device *dev, struct device_attribute *attr,
  347. const char *buf, size_t count)
  348. {
  349. struct lm95234_data *data = dev_get_drvdata(dev);
  350. int index = to_sensor_dev_attr(attr)->index;
  351. int ret = lm95234_update_device(data);
  352. long val;
  353. if (ret)
  354. return ret;
  355. ret = kstrtol(buf, 10, &val);
  356. if (ret < 0)
  357. return ret;
  358. /* Accuracy is 1/2 degrees C */
  359. val = clamp_val(DIV_ROUND_CLOSEST(val, 500), -128, 127);
  360. mutex_lock(&data->update_lock);
  361. data->toffset[index] = val;
  362. i2c_smbus_write_byte_data(data->client, LM95234_REG_OFFSET(index), val);
  363. mutex_unlock(&data->update_lock);
  364. return count;
  365. }
  366. static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
  367. char *buf)
  368. {
  369. struct lm95234_data *data = dev_get_drvdata(dev);
  370. int ret = lm95234_update_device(data);
  371. if (ret)
  372. return ret;
  373. return sprintf(buf, "%lu\n",
  374. DIV_ROUND_CLOSEST(data->interval * 1000, HZ));
  375. }
  376. static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
  377. const char *buf, size_t count)
  378. {
  379. struct lm95234_data *data = dev_get_drvdata(dev);
  380. int ret = lm95234_update_device(data);
  381. unsigned long val;
  382. u8 regval;
  383. if (ret)
  384. return ret;
  385. ret = kstrtoul(buf, 10, &val);
  386. if (ret < 0)
  387. return ret;
  388. for (regval = 0; regval < 3; regval++) {
  389. if (val <= update_intervals[regval])
  390. break;
  391. }
  392. mutex_lock(&data->update_lock);
  393. data->interval = msecs_to_jiffies(update_intervals[regval]);
  394. i2c_smbus_write_byte_data(data->client, LM95234_REG_CONVRATE, regval);
  395. mutex_unlock(&data->update_lock);
  396. return count;
  397. }
  398. static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
  399. static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
  400. static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
  401. static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
  402. static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
  403. static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
  404. BIT(0) | BIT(1));
  405. static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL,
  406. BIT(2) | BIT(3));
  407. static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL,
  408. BIT(4) | BIT(5));
  409. static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL,
  410. BIT(6) | BIT(7));
  411. static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type,
  412. BIT(1));
  413. static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type,
  414. BIT(2));
  415. static SENSOR_DEVICE_ATTR(temp4_type, S_IWUSR | S_IRUGO, show_type, set_type,
  416. BIT(3));
  417. static SENSOR_DEVICE_ATTR(temp5_type, S_IWUSR | S_IRUGO, show_type, set_type,
  418. BIT(4));
  419. static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_tcrit1,
  420. set_tcrit1, 0);
  421. static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_tcrit2,
  422. set_tcrit2, 0);
  423. static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_tcrit2,
  424. set_tcrit2, 1);
  425. static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_tcrit1,
  426. set_tcrit1, 3);
  427. static SENSOR_DEVICE_ATTR(temp5_max, S_IWUSR | S_IRUGO, show_tcrit1,
  428. set_tcrit1, 4);
  429. static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_tcrit1_hyst,
  430. set_tcrit1_hyst, 0);
  431. static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 0);
  432. static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 1);
  433. static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 3);
  434. static SENSOR_DEVICE_ATTR(temp5_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 4);
  435. static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
  436. BIT(0 + 8));
  437. static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL,
  438. BIT(1 + 16));
  439. static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL,
  440. BIT(2 + 16));
  441. static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL,
  442. BIT(3 + 8));
  443. static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL,
  444. BIT(4 + 8));
  445. static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_tcrit1,
  446. set_tcrit1, 1);
  447. static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_tcrit1,
  448. set_tcrit1, 2);
  449. static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 1);
  450. static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 2);
  451. static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
  452. BIT(1 + 8));
  453. static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL,
  454. BIT(2 + 8));
  455. static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_offset,
  456. set_offset, 0);
  457. static SENSOR_DEVICE_ATTR(temp3_offset, S_IWUSR | S_IRUGO, show_offset,
  458. set_offset, 1);
  459. static SENSOR_DEVICE_ATTR(temp4_offset, S_IWUSR | S_IRUGO, show_offset,
  460. set_offset, 2);
  461. static SENSOR_DEVICE_ATTR(temp5_offset, S_IWUSR | S_IRUGO, show_offset,
  462. set_offset, 3);
  463. static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
  464. set_interval);
  465. static struct attribute *lm95234_attrs[] = {
  466. &sensor_dev_attr_temp1_input.dev_attr.attr,
  467. &sensor_dev_attr_temp2_input.dev_attr.attr,
  468. &sensor_dev_attr_temp3_input.dev_attr.attr,
  469. &sensor_dev_attr_temp4_input.dev_attr.attr,
  470. &sensor_dev_attr_temp5_input.dev_attr.attr,
  471. &sensor_dev_attr_temp2_fault.dev_attr.attr,
  472. &sensor_dev_attr_temp3_fault.dev_attr.attr,
  473. &sensor_dev_attr_temp4_fault.dev_attr.attr,
  474. &sensor_dev_attr_temp5_fault.dev_attr.attr,
  475. &sensor_dev_attr_temp2_type.dev_attr.attr,
  476. &sensor_dev_attr_temp3_type.dev_attr.attr,
  477. &sensor_dev_attr_temp4_type.dev_attr.attr,
  478. &sensor_dev_attr_temp5_type.dev_attr.attr,
  479. &sensor_dev_attr_temp1_max.dev_attr.attr,
  480. &sensor_dev_attr_temp2_max.dev_attr.attr,
  481. &sensor_dev_attr_temp3_max.dev_attr.attr,
  482. &sensor_dev_attr_temp4_max.dev_attr.attr,
  483. &sensor_dev_attr_temp5_max.dev_attr.attr,
  484. &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
  485. &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
  486. &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
  487. &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
  488. &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
  489. &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
  490. &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
  491. &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
  492. &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
  493. &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
  494. &sensor_dev_attr_temp2_crit.dev_attr.attr,
  495. &sensor_dev_attr_temp3_crit.dev_attr.attr,
  496. &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
  497. &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
  498. &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
  499. &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
  500. &sensor_dev_attr_temp2_offset.dev_attr.attr,
  501. &sensor_dev_attr_temp3_offset.dev_attr.attr,
  502. &sensor_dev_attr_temp4_offset.dev_attr.attr,
  503. &sensor_dev_attr_temp5_offset.dev_attr.attr,
  504. &dev_attr_update_interval.attr,
  505. NULL
  506. };
  507. ATTRIBUTE_GROUPS(lm95234);
  508. static int lm95234_detect(struct i2c_client *client,
  509. struct i2c_board_info *info)
  510. {
  511. struct i2c_adapter *adapter = client->adapter;
  512. int mfg_id, chip_id, val;
  513. if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  514. return -ENODEV;
  515. mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID);
  516. if (mfg_id != NATSEMI_MAN_ID)
  517. return -ENODEV;
  518. chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID);
  519. if (chip_id != LM95234_CHIP_ID)
  520. return -ENODEV;
  521. val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS);
  522. if (val & 0x30)
  523. return -ENODEV;
  524. val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
  525. if (val & 0xbc)
  526. return -ENODEV;
  527. val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
  528. if (val & 0xfc)
  529. return -ENODEV;
  530. val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
  531. if (val & 0xe1)
  532. return -ENODEV;
  533. val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
  534. if (val & 0xe1)
  535. return -ENODEV;
  536. strlcpy(info->type, "lm95234", I2C_NAME_SIZE);
  537. return 0;
  538. }
  539. static int lm95234_init_client(struct i2c_client *client)
  540. {
  541. int val, model;
  542. /* start conversion if necessary */
  543. val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
  544. if (val < 0)
  545. return val;
  546. if (val & 0x40)
  547. i2c_smbus_write_byte_data(client, LM95234_REG_CONFIG,
  548. val & ~0x40);
  549. /* If diode type status reports an error, try to fix it */
  550. val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
  551. if (val < 0)
  552. return val;
  553. model = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
  554. if (model < 0)
  555. return model;
  556. if (model & val) {
  557. dev_notice(&client->dev,
  558. "Fixing remote diode type misconfiguration (0x%x)\n",
  559. val);
  560. i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL,
  561. model & ~val);
  562. }
  563. return 0;
  564. }
  565. static int lm95234_probe(struct i2c_client *client,
  566. const struct i2c_device_id *id)
  567. {
  568. struct device *dev = &client->dev;
  569. struct lm95234_data *data;
  570. struct device *hwmon_dev;
  571. int err;
  572. data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL);
  573. if (!data)
  574. return -ENOMEM;
  575. data->client = client;
  576. mutex_init(&data->update_lock);
  577. /* Initialize the LM95234 chip */
  578. err = lm95234_init_client(client);
  579. if (err < 0)
  580. return err;
  581. hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
  582. data,
  583. lm95234_groups);
  584. return PTR_ERR_OR_ZERO(hwmon_dev);
  585. }
  586. /* Driver data (common to all clients) */
  587. static const struct i2c_device_id lm95234_id[] = {
  588. { "lm95234", 0 },
  589. { }
  590. };
  591. MODULE_DEVICE_TABLE(i2c, lm95234_id);
  592. static struct i2c_driver lm95234_driver = {
  593. .class = I2C_CLASS_HWMON,
  594. .driver = {
  595. .name = DRVNAME,
  596. },
  597. .probe = lm95234_probe,
  598. .id_table = lm95234_id,
  599. .detect = lm95234_detect,
  600. .address_list = normal_i2c,
  601. };
  602. module_i2c_driver(lm95234_driver);
  603. MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
  604. MODULE_DESCRIPTION("LM95234 sensor driver");
  605. MODULE_LICENSE("GPL");