lm87.c 29 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * lm87.c
  4. *
  5. * Copyright (C) 2000 Frodo Looijaard <frodol@dds.nl>
  6. * Philip Edelbrock <phil@netroedge.com>
  7. * Stephen Rousset <stephen.rousset@rocketlogix.com>
  8. * Dan Eaton <dan.eaton@rocketlogix.com>
  9. * Copyright (C) 2004-2008 Jean Delvare <jdelvare@suse.de>
  10. *
  11. * Original port to Linux 2.6 by Jeff Oliver.
  12. *
  13. * The LM87 is a sensor chip made by National Semiconductor. It monitors up
  14. * to 8 voltages (including its own power source), up to three temperatures
  15. * (its own plus up to two external ones) and up to two fans. The default
  16. * configuration is 6 voltages, two temperatures and two fans (see below).
  17. * Voltages are scaled internally with ratios such that the nominal value of
  18. * each voltage correspond to a register value of 192 (which means a
  19. * resolution of about 0.5% of the nominal value). Temperature values are
  20. * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
  21. * datasheet can be obtained from National's website at:
  22. * http://www.national.com/pf/LM/LM87.html
  23. *
  24. * Some functions share pins, so not all functions are available at the same
  25. * time. Which are depends on the hardware setup. This driver normally
  26. * assumes that firmware configured the chip correctly. Where this is not
  27. * the case, platform code must set the I2C client's platform_data to point
  28. * to a u8 value to be written to the channel register.
  29. * For reference, here is the list of exclusive functions:
  30. * - in0+in5 (default) or temp3
  31. * - fan1 (default) or in6
  32. * - fan2 (default) or in7
  33. * - VID lines (default) or IRQ lines (not handled by this driver)
  34. *
  35. * The LM87 additionally features an analog output, supposedly usable to
  36. * control the speed of a fan. All new chips use pulse width modulation
  37. * instead. The LM87 is the only hardware monitoring chipset I know of
  38. * which uses amplitude modulation. Be careful when using this feature.
  39. *
  40. * This driver also supports the ADM1024, a sensor chip made by Analog
  41. * Devices. That chip is fully compatible with the LM87. Complete
  42. * datasheet can be obtained from Analog's website at:
  43. * https://www.analog.com/en/prod/0,2877,ADM1024,00.html
  44. */
  45. #include <linux/module.h>
  46. #include <linux/init.h>
  47. #include <linux/slab.h>
  48. #include <linux/jiffies.h>
  49. #include <linux/i2c.h>
  50. #include <linux/hwmon.h>
  51. #include <linux/hwmon-sysfs.h>
  52. #include <linux/hwmon-vid.h>
  53. #include <linux/err.h>
  54. #include <linux/mutex.h>
  55. #include <linux/regulator/consumer.h>
  56. /*
  57. * Addresses to scan
  58. * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
  59. */
  60. static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  61. /*
  62. * The LM87 registers
  63. */
  64. /* nr in 0..5 */
  65. #define LM87_REG_IN(nr) (0x20 + (nr))
  66. #define LM87_REG_IN_MAX(nr) (0x2B + (nr) * 2)
  67. #define LM87_REG_IN_MIN(nr) (0x2C + (nr) * 2)
  68. /* nr in 0..1 */
  69. #define LM87_REG_AIN(nr) (0x28 + (nr))
  70. #define LM87_REG_AIN_MIN(nr) (0x1A + (nr))
  71. #define LM87_REG_AIN_MAX(nr) (0x3B + (nr))
  72. static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
  73. static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
  74. static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  75. #define LM87_REG_TEMP_HW_INT_LOCK 0x13
  76. #define LM87_REG_TEMP_HW_EXT_LOCK 0x14
  77. #define LM87_REG_TEMP_HW_INT 0x17
  78. #define LM87_REG_TEMP_HW_EXT 0x18
  79. /* nr in 0..1 */
  80. #define LM87_REG_FAN(nr) (0x28 + (nr))
  81. #define LM87_REG_FAN_MIN(nr) (0x3B + (nr))
  82. #define LM87_REG_AOUT 0x19
  83. #define LM87_REG_CONFIG 0x40
  84. #define LM87_REG_CHANNEL_MODE 0x16
  85. #define LM87_REG_VID_FAN_DIV 0x47
  86. #define LM87_REG_VID4 0x49
  87. #define LM87_REG_ALARMS1 0x41
  88. #define LM87_REG_ALARMS2 0x42
  89. #define LM87_REG_COMPANY_ID 0x3E
  90. #define LM87_REG_REVISION 0x3F
  91. /*
  92. * Conversions and various macros
  93. * The LM87 uses signed 8-bit values for temperatures.
  94. */
  95. #define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
  96. #define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \
  97. (val) >= (scale) * 255 / 192 ? 255 : \
  98. ((val) * 192 + (scale) / 2) / (scale))
  99. #define TEMP_FROM_REG(reg) ((reg) * 1000)
  100. #define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \
  101. (val) >= 126500 ? 127 : \
  102. (((val) < 0 ? (val) - 500 : \
  103. (val) + 500) / 1000))
  104. #define FAN_FROM_REG(reg, div) ((reg) == 255 || (reg) == 0 ? 0 : \
  105. (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
  106. #define FAN_TO_REG(val, div) ((val) * (div) * 255 <= 1350000 ? 255 : \
  107. (1350000 + (val)*(div) / 2) / ((val) * (div)))
  108. #define FAN_DIV_FROM_REG(reg) (1 << (reg))
  109. /* analog out is 9.80mV/LSB */
  110. #define AOUT_FROM_REG(reg) (((reg) * 98 + 5) / 10)
  111. #define AOUT_TO_REG(val) ((val) <= 0 ? 0 : \
  112. (val) >= 2500 ? 255 : \
  113. ((val) * 10 + 49) / 98)
  114. /* nr in 0..1 */
  115. #define CHAN_NO_FAN(nr) (1 << (nr))
  116. #define CHAN_TEMP3 (1 << 2)
  117. #define CHAN_VCC_5V (1 << 3)
  118. #define CHAN_NO_VID (1 << 7)
  119. /*
  120. * Client data (each client gets its own)
  121. */
  122. struct lm87_data {
  123. struct mutex update_lock;
  124. char valid; /* zero until following fields are valid */
  125. unsigned long last_updated; /* In jiffies */
  126. u8 channel; /* register value */
  127. u8 config; /* original register value */
  128. u8 in[8]; /* register value */
  129. u8 in_max[8]; /* register value */
  130. u8 in_min[8]; /* register value */
  131. u16 in_scale[8];
  132. s8 temp[3]; /* register value */
  133. s8 temp_high[3]; /* register value */
  134. s8 temp_low[3]; /* register value */
  135. s8 temp_crit_int; /* min of two register values */
  136. s8 temp_crit_ext; /* min of two register values */
  137. u8 fan[2]; /* register value */
  138. u8 fan_min[2]; /* register value */
  139. u8 fan_div[2]; /* register value, shifted right */
  140. u8 aout; /* register value */
  141. u16 alarms; /* register values, combined */
  142. u8 vid; /* register values, combined */
  143. u8 vrm;
  144. const struct attribute_group *attr_groups[6];
  145. };
  146. static inline int lm87_read_value(struct i2c_client *client, u8 reg)
  147. {
  148. return i2c_smbus_read_byte_data(client, reg);
  149. }
  150. static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
  151. {
  152. return i2c_smbus_write_byte_data(client, reg, value);
  153. }
  154. static struct lm87_data *lm87_update_device(struct device *dev)
  155. {
  156. struct i2c_client *client = dev_get_drvdata(dev);
  157. struct lm87_data *data = i2c_get_clientdata(client);
  158. mutex_lock(&data->update_lock);
  159. if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
  160. int i, j;
  161. dev_dbg(&client->dev, "Updating data.\n");
  162. i = (data->channel & CHAN_TEMP3) ? 1 : 0;
  163. j = (data->channel & CHAN_TEMP3) ? 5 : 6;
  164. for (; i < j; i++) {
  165. data->in[i] = lm87_read_value(client,
  166. LM87_REG_IN(i));
  167. data->in_min[i] = lm87_read_value(client,
  168. LM87_REG_IN_MIN(i));
  169. data->in_max[i] = lm87_read_value(client,
  170. LM87_REG_IN_MAX(i));
  171. }
  172. for (i = 0; i < 2; i++) {
  173. if (data->channel & CHAN_NO_FAN(i)) {
  174. data->in[6+i] = lm87_read_value(client,
  175. LM87_REG_AIN(i));
  176. data->in_max[6+i] = lm87_read_value(client,
  177. LM87_REG_AIN_MAX(i));
  178. data->in_min[6+i] = lm87_read_value(client,
  179. LM87_REG_AIN_MIN(i));
  180. } else {
  181. data->fan[i] = lm87_read_value(client,
  182. LM87_REG_FAN(i));
  183. data->fan_min[i] = lm87_read_value(client,
  184. LM87_REG_FAN_MIN(i));
  185. }
  186. }
  187. j = (data->channel & CHAN_TEMP3) ? 3 : 2;
  188. for (i = 0 ; i < j; i++) {
  189. data->temp[i] = lm87_read_value(client,
  190. LM87_REG_TEMP[i]);
  191. data->temp_high[i] = lm87_read_value(client,
  192. LM87_REG_TEMP_HIGH[i]);
  193. data->temp_low[i] = lm87_read_value(client,
  194. LM87_REG_TEMP_LOW[i]);
  195. }
  196. i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
  197. j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
  198. data->temp_crit_int = min(i, j);
  199. i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
  200. j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
  201. data->temp_crit_ext = min(i, j);
  202. i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
  203. data->fan_div[0] = (i >> 4) & 0x03;
  204. data->fan_div[1] = (i >> 6) & 0x03;
  205. data->vid = (i & 0x0F)
  206. | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
  207. << 4;
  208. data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
  209. | (lm87_read_value(client, LM87_REG_ALARMS2)
  210. << 8);
  211. data->aout = lm87_read_value(client, LM87_REG_AOUT);
  212. data->last_updated = jiffies;
  213. data->valid = 1;
  214. }
  215. mutex_unlock(&data->update_lock);
  216. return data;
  217. }
  218. /*
  219. * Sysfs stuff
  220. */
  221. static ssize_t in_input_show(struct device *dev,
  222. struct device_attribute *attr, char *buf)
  223. {
  224. struct lm87_data *data = lm87_update_device(dev);
  225. int nr = to_sensor_dev_attr(attr)->index;
  226. return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],
  227. data->in_scale[nr]));
  228. }
  229. static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,
  230. char *buf)
  231. {
  232. struct lm87_data *data = lm87_update_device(dev);
  233. int nr = to_sensor_dev_attr(attr)->index;
  234. return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],
  235. data->in_scale[nr]));
  236. }
  237. static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,
  238. char *buf)
  239. {
  240. struct lm87_data *data = lm87_update_device(dev);
  241. int nr = to_sensor_dev_attr(attr)->index;
  242. return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],
  243. data->in_scale[nr]));
  244. }
  245. static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
  246. const char *buf, size_t count)
  247. {
  248. struct i2c_client *client = dev_get_drvdata(dev);
  249. struct lm87_data *data = i2c_get_clientdata(client);
  250. int nr = to_sensor_dev_attr(attr)->index;
  251. long val;
  252. int err;
  253. err = kstrtol(buf, 10, &val);
  254. if (err)
  255. return err;
  256. mutex_lock(&data->update_lock);
  257. data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
  258. lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
  259. LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
  260. mutex_unlock(&data->update_lock);
  261. return count;
  262. }
  263. static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
  264. const char *buf, size_t count)
  265. {
  266. struct i2c_client *client = dev_get_drvdata(dev);
  267. struct lm87_data *data = i2c_get_clientdata(client);
  268. int nr = to_sensor_dev_attr(attr)->index;
  269. long val;
  270. int err;
  271. err = kstrtol(buf, 10, &val);
  272. if (err)
  273. return err;
  274. mutex_lock(&data->update_lock);
  275. data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
  276. lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
  277. LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
  278. mutex_unlock(&data->update_lock);
  279. return count;
  280. }
  281. static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0);
  282. static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
  283. static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
  284. static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1);
  285. static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
  286. static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
  287. static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2);
  288. static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
  289. static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
  290. static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3);
  291. static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
  292. static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
  293. static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4);
  294. static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
  295. static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
  296. static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5);
  297. static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
  298. static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
  299. static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6);
  300. static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
  301. static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
  302. static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7);
  303. static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);
  304. static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);
  305. static ssize_t temp_input_show(struct device *dev,
  306. struct device_attribute *attr, char *buf)
  307. {
  308. struct lm87_data *data = lm87_update_device(dev);
  309. int nr = to_sensor_dev_attr(attr)->index;
  310. return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
  311. }
  312. static ssize_t temp_low_show(struct device *dev,
  313. struct device_attribute *attr, char *buf)
  314. {
  315. struct lm87_data *data = lm87_update_device(dev);
  316. int nr = to_sensor_dev_attr(attr)->index;
  317. return sprintf(buf, "%d\n",
  318. TEMP_FROM_REG(data->temp_low[nr]));
  319. }
  320. static ssize_t temp_high_show(struct device *dev,
  321. struct device_attribute *attr, char *buf)
  322. {
  323. struct lm87_data *data = lm87_update_device(dev);
  324. int nr = to_sensor_dev_attr(attr)->index;
  325. return sprintf(buf, "%d\n",
  326. TEMP_FROM_REG(data->temp_high[nr]));
  327. }
  328. static ssize_t temp_low_store(struct device *dev,
  329. struct device_attribute *attr, const char *buf,
  330. size_t count)
  331. {
  332. struct i2c_client *client = dev_get_drvdata(dev);
  333. struct lm87_data *data = i2c_get_clientdata(client);
  334. int nr = to_sensor_dev_attr(attr)->index;
  335. long val;
  336. int err;
  337. err = kstrtol(buf, 10, &val);
  338. if (err)
  339. return err;
  340. mutex_lock(&data->update_lock);
  341. data->temp_low[nr] = TEMP_TO_REG(val);
  342. lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
  343. mutex_unlock(&data->update_lock);
  344. return count;
  345. }
  346. static ssize_t temp_high_store(struct device *dev,
  347. struct device_attribute *attr, const char *buf,
  348. size_t count)
  349. {
  350. struct i2c_client *client = dev_get_drvdata(dev);
  351. struct lm87_data *data = i2c_get_clientdata(client);
  352. int nr = to_sensor_dev_attr(attr)->index;
  353. long val;
  354. int err;
  355. err = kstrtol(buf, 10, &val);
  356. if (err)
  357. return err;
  358. mutex_lock(&data->update_lock);
  359. data->temp_high[nr] = TEMP_TO_REG(val);
  360. lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
  361. mutex_unlock(&data->update_lock);
  362. return count;
  363. }
  364. static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
  365. static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0);
  366. static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0);
  367. static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
  368. static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1);
  369. static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1);
  370. static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
  371. static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2);
  372. static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2);
  373. static ssize_t temp1_crit_show(struct device *dev,
  374. struct device_attribute *attr, char *buf)
  375. {
  376. struct lm87_data *data = lm87_update_device(dev);
  377. return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
  378. }
  379. static ssize_t temp2_crit_show(struct device *dev,
  380. struct device_attribute *attr, char *buf)
  381. {
  382. struct lm87_data *data = lm87_update_device(dev);
  383. return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
  384. }
  385. static DEVICE_ATTR_RO(temp1_crit);
  386. static DEVICE_ATTR_RO(temp2_crit);
  387. static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL);
  388. static ssize_t fan_input_show(struct device *dev,
  389. struct device_attribute *attr, char *buf)
  390. {
  391. struct lm87_data *data = lm87_update_device(dev);
  392. int nr = to_sensor_dev_attr(attr)->index;
  393. return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
  394. FAN_DIV_FROM_REG(data->fan_div[nr])));
  395. }
  396. static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
  397. char *buf)
  398. {
  399. struct lm87_data *data = lm87_update_device(dev);
  400. int nr = to_sensor_dev_attr(attr)->index;
  401. return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
  402. FAN_DIV_FROM_REG(data->fan_div[nr])));
  403. }
  404. static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
  405. char *buf)
  406. {
  407. struct lm87_data *data = lm87_update_device(dev);
  408. int nr = to_sensor_dev_attr(attr)->index;
  409. return sprintf(buf, "%d\n",
  410. FAN_DIV_FROM_REG(data->fan_div[nr]));
  411. }
  412. static ssize_t fan_min_store(struct device *dev,
  413. struct device_attribute *attr, const char *buf,
  414. size_t count)
  415. {
  416. struct i2c_client *client = dev_get_drvdata(dev);
  417. struct lm87_data *data = i2c_get_clientdata(client);
  418. int nr = to_sensor_dev_attr(attr)->index;
  419. long val;
  420. int err;
  421. err = kstrtol(buf, 10, &val);
  422. if (err)
  423. return err;
  424. mutex_lock(&data->update_lock);
  425. data->fan_min[nr] = FAN_TO_REG(val,
  426. FAN_DIV_FROM_REG(data->fan_div[nr]));
  427. lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
  428. mutex_unlock(&data->update_lock);
  429. return count;
  430. }
  431. /*
  432. * Note: we save and restore the fan minimum here, because its value is
  433. * determined in part by the fan clock divider. This follows the principle
  434. * of least surprise; the user doesn't expect the fan minimum to change just
  435. * because the divider changed.
  436. */
  437. static ssize_t fan_div_store(struct device *dev,
  438. struct device_attribute *attr, const char *buf,
  439. size_t count)
  440. {
  441. struct i2c_client *client = dev_get_drvdata(dev);
  442. struct lm87_data *data = i2c_get_clientdata(client);
  443. int nr = to_sensor_dev_attr(attr)->index;
  444. long val;
  445. int err;
  446. unsigned long min;
  447. u8 reg;
  448. err = kstrtol(buf, 10, &val);
  449. if (err)
  450. return err;
  451. mutex_lock(&data->update_lock);
  452. min = FAN_FROM_REG(data->fan_min[nr],
  453. FAN_DIV_FROM_REG(data->fan_div[nr]));
  454. switch (val) {
  455. case 1:
  456. data->fan_div[nr] = 0;
  457. break;
  458. case 2:
  459. data->fan_div[nr] = 1;
  460. break;
  461. case 4:
  462. data->fan_div[nr] = 2;
  463. break;
  464. case 8:
  465. data->fan_div[nr] = 3;
  466. break;
  467. default:
  468. mutex_unlock(&data->update_lock);
  469. return -EINVAL;
  470. }
  471. reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
  472. switch (nr) {
  473. case 0:
  474. reg = (reg & 0xCF) | (data->fan_div[0] << 4);
  475. break;
  476. case 1:
  477. reg = (reg & 0x3F) | (data->fan_div[1] << 6);
  478. break;
  479. }
  480. lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
  481. data->fan_min[nr] = FAN_TO_REG(min, val);
  482. lm87_write_value(client, LM87_REG_FAN_MIN(nr),
  483. data->fan_min[nr]);
  484. mutex_unlock(&data->update_lock);
  485. return count;
  486. }
  487. static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
  488. static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
  489. static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
  490. static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
  491. static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
  492. static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
  493. static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
  494. char *buf)
  495. {
  496. struct lm87_data *data = lm87_update_device(dev);
  497. return sprintf(buf, "%d\n", data->alarms);
  498. }
  499. static DEVICE_ATTR_RO(alarms);
  500. static ssize_t cpu0_vid_show(struct device *dev,
  501. struct device_attribute *attr, char *buf)
  502. {
  503. struct lm87_data *data = lm87_update_device(dev);
  504. return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
  505. }
  506. static DEVICE_ATTR_RO(cpu0_vid);
  507. static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
  508. char *buf)
  509. {
  510. struct lm87_data *data = dev_get_drvdata(dev);
  511. return sprintf(buf, "%d\n", data->vrm);
  512. }
  513. static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
  514. const char *buf, size_t count)
  515. {
  516. struct lm87_data *data = dev_get_drvdata(dev);
  517. unsigned long val;
  518. int err;
  519. err = kstrtoul(buf, 10, &val);
  520. if (err)
  521. return err;
  522. if (val > 255)
  523. return -EINVAL;
  524. data->vrm = val;
  525. return count;
  526. }
  527. static DEVICE_ATTR_RW(vrm);
  528. static ssize_t aout_output_show(struct device *dev,
  529. struct device_attribute *attr, char *buf)
  530. {
  531. struct lm87_data *data = lm87_update_device(dev);
  532. return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
  533. }
  534. static ssize_t aout_output_store(struct device *dev,
  535. struct device_attribute *attr,
  536. const char *buf, size_t count)
  537. {
  538. struct i2c_client *client = dev_get_drvdata(dev);
  539. struct lm87_data *data = i2c_get_clientdata(client);
  540. long val;
  541. int err;
  542. err = kstrtol(buf, 10, &val);
  543. if (err)
  544. return err;
  545. mutex_lock(&data->update_lock);
  546. data->aout = AOUT_TO_REG(val);
  547. lm87_write_value(client, LM87_REG_AOUT, data->aout);
  548. mutex_unlock(&data->update_lock);
  549. return count;
  550. }
  551. static DEVICE_ATTR_RW(aout_output);
  552. static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
  553. char *buf)
  554. {
  555. struct lm87_data *data = lm87_update_device(dev);
  556. int bitnr = to_sensor_dev_attr(attr)->index;
  557. return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
  558. }
  559. static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
  560. static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
  561. static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
  562. static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
  563. static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
  564. static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
  565. static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);
  566. static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7);
  567. static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
  568. static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);
  569. static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5);
  570. static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
  571. static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
  572. static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14);
  573. static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15);
  574. /*
  575. * Real code
  576. */
  577. static struct attribute *lm87_attributes[] = {
  578. &sensor_dev_attr_in1_input.dev_attr.attr,
  579. &sensor_dev_attr_in1_min.dev_attr.attr,
  580. &sensor_dev_attr_in1_max.dev_attr.attr,
  581. &sensor_dev_attr_in1_alarm.dev_attr.attr,
  582. &sensor_dev_attr_in2_input.dev_attr.attr,
  583. &sensor_dev_attr_in2_min.dev_attr.attr,
  584. &sensor_dev_attr_in2_max.dev_attr.attr,
  585. &sensor_dev_attr_in2_alarm.dev_attr.attr,
  586. &sensor_dev_attr_in3_input.dev_attr.attr,
  587. &sensor_dev_attr_in3_min.dev_attr.attr,
  588. &sensor_dev_attr_in3_max.dev_attr.attr,
  589. &sensor_dev_attr_in3_alarm.dev_attr.attr,
  590. &sensor_dev_attr_in4_input.dev_attr.attr,
  591. &sensor_dev_attr_in4_min.dev_attr.attr,
  592. &sensor_dev_attr_in4_max.dev_attr.attr,
  593. &sensor_dev_attr_in4_alarm.dev_attr.attr,
  594. &sensor_dev_attr_temp1_input.dev_attr.attr,
  595. &sensor_dev_attr_temp1_max.dev_attr.attr,
  596. &sensor_dev_attr_temp1_min.dev_attr.attr,
  597. &dev_attr_temp1_crit.attr,
  598. &sensor_dev_attr_temp1_alarm.dev_attr.attr,
  599. &sensor_dev_attr_temp2_input.dev_attr.attr,
  600. &sensor_dev_attr_temp2_max.dev_attr.attr,
  601. &sensor_dev_attr_temp2_min.dev_attr.attr,
  602. &dev_attr_temp2_crit.attr,
  603. &sensor_dev_attr_temp2_alarm.dev_attr.attr,
  604. &sensor_dev_attr_temp2_fault.dev_attr.attr,
  605. &dev_attr_alarms.attr,
  606. &dev_attr_aout_output.attr,
  607. NULL
  608. };
  609. static const struct attribute_group lm87_group = {
  610. .attrs = lm87_attributes,
  611. };
  612. static struct attribute *lm87_attributes_in6[] = {
  613. &sensor_dev_attr_in6_input.dev_attr.attr,
  614. &sensor_dev_attr_in6_min.dev_attr.attr,
  615. &sensor_dev_attr_in6_max.dev_attr.attr,
  616. &sensor_dev_attr_in6_alarm.dev_attr.attr,
  617. NULL
  618. };
  619. static const struct attribute_group lm87_group_in6 = {
  620. .attrs = lm87_attributes_in6,
  621. };
  622. static struct attribute *lm87_attributes_fan1[] = {
  623. &sensor_dev_attr_fan1_input.dev_attr.attr,
  624. &sensor_dev_attr_fan1_min.dev_attr.attr,
  625. &sensor_dev_attr_fan1_div.dev_attr.attr,
  626. &sensor_dev_attr_fan1_alarm.dev_attr.attr,
  627. NULL
  628. };
  629. static const struct attribute_group lm87_group_fan1 = {
  630. .attrs = lm87_attributes_fan1,
  631. };
  632. static struct attribute *lm87_attributes_in7[] = {
  633. &sensor_dev_attr_in7_input.dev_attr.attr,
  634. &sensor_dev_attr_in7_min.dev_attr.attr,
  635. &sensor_dev_attr_in7_max.dev_attr.attr,
  636. &sensor_dev_attr_in7_alarm.dev_attr.attr,
  637. NULL
  638. };
  639. static const struct attribute_group lm87_group_in7 = {
  640. .attrs = lm87_attributes_in7,
  641. };
  642. static struct attribute *lm87_attributes_fan2[] = {
  643. &sensor_dev_attr_fan2_input.dev_attr.attr,
  644. &sensor_dev_attr_fan2_min.dev_attr.attr,
  645. &sensor_dev_attr_fan2_div.dev_attr.attr,
  646. &sensor_dev_attr_fan2_alarm.dev_attr.attr,
  647. NULL
  648. };
  649. static const struct attribute_group lm87_group_fan2 = {
  650. .attrs = lm87_attributes_fan2,
  651. };
  652. static struct attribute *lm87_attributes_temp3[] = {
  653. &sensor_dev_attr_temp3_input.dev_attr.attr,
  654. &sensor_dev_attr_temp3_max.dev_attr.attr,
  655. &sensor_dev_attr_temp3_min.dev_attr.attr,
  656. &dev_attr_temp3_crit.attr,
  657. &sensor_dev_attr_temp3_alarm.dev_attr.attr,
  658. &sensor_dev_attr_temp3_fault.dev_attr.attr,
  659. NULL
  660. };
  661. static const struct attribute_group lm87_group_temp3 = {
  662. .attrs = lm87_attributes_temp3,
  663. };
  664. static struct attribute *lm87_attributes_in0_5[] = {
  665. &sensor_dev_attr_in0_input.dev_attr.attr,
  666. &sensor_dev_attr_in0_min.dev_attr.attr,
  667. &sensor_dev_attr_in0_max.dev_attr.attr,
  668. &sensor_dev_attr_in0_alarm.dev_attr.attr,
  669. &sensor_dev_attr_in5_input.dev_attr.attr,
  670. &sensor_dev_attr_in5_min.dev_attr.attr,
  671. &sensor_dev_attr_in5_max.dev_attr.attr,
  672. &sensor_dev_attr_in5_alarm.dev_attr.attr,
  673. NULL
  674. };
  675. static const struct attribute_group lm87_group_in0_5 = {
  676. .attrs = lm87_attributes_in0_5,
  677. };
  678. static struct attribute *lm87_attributes_vid[] = {
  679. &dev_attr_cpu0_vid.attr,
  680. &dev_attr_vrm.attr,
  681. NULL
  682. };
  683. static const struct attribute_group lm87_group_vid = {
  684. .attrs = lm87_attributes_vid,
  685. };
  686. /* Return 0 if detection is successful, -ENODEV otherwise */
  687. static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
  688. {
  689. struct i2c_adapter *adapter = client->adapter;
  690. const char *name;
  691. u8 cid, rev;
  692. if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  693. return -ENODEV;
  694. if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
  695. return -ENODEV;
  696. /* Now, we do the remaining detection. */
  697. cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
  698. rev = lm87_read_value(client, LM87_REG_REVISION);
  699. if (cid == 0x02 /* National Semiconductor */
  700. && (rev >= 0x01 && rev <= 0x08))
  701. name = "lm87";
  702. else if (cid == 0x41 /* Analog Devices */
  703. && (rev & 0xf0) == 0x10)
  704. name = "adm1024";
  705. else {
  706. dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
  707. client->addr);
  708. return -ENODEV;
  709. }
  710. strlcpy(info->type, name, I2C_NAME_SIZE);
  711. return 0;
  712. }
  713. static void lm87_restore_config(void *arg)
  714. {
  715. struct i2c_client *client = arg;
  716. struct lm87_data *data = i2c_get_clientdata(client);
  717. lm87_write_value(client, LM87_REG_CONFIG, data->config);
  718. }
  719. static int lm87_init_client(struct i2c_client *client)
  720. {
  721. struct lm87_data *data = i2c_get_clientdata(client);
  722. int rc;
  723. struct device_node *of_node = client->dev.of_node;
  724. u8 val = 0;
  725. struct regulator *vcc = NULL;
  726. if (of_node) {
  727. if (of_property_read_bool(of_node, "has-temp3"))
  728. val |= CHAN_TEMP3;
  729. if (of_property_read_bool(of_node, "has-in6"))
  730. val |= CHAN_NO_FAN(0);
  731. if (of_property_read_bool(of_node, "has-in7"))
  732. val |= CHAN_NO_FAN(1);
  733. vcc = devm_regulator_get_optional(&client->dev, "vcc");
  734. if (!IS_ERR(vcc)) {
  735. if (regulator_get_voltage(vcc) == 5000000)
  736. val |= CHAN_VCC_5V;
  737. }
  738. data->channel = val;
  739. lm87_write_value(client,
  740. LM87_REG_CHANNEL_MODE, data->channel);
  741. } else if (dev_get_platdata(&client->dev)) {
  742. data->channel = *(u8 *)dev_get_platdata(&client->dev);
  743. lm87_write_value(client,
  744. LM87_REG_CHANNEL_MODE, data->channel);
  745. } else {
  746. data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
  747. }
  748. data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
  749. rc = devm_add_action(&client->dev, lm87_restore_config, client);
  750. if (rc)
  751. return rc;
  752. if (!(data->config & 0x01)) {
  753. int i;
  754. /* Limits are left uninitialized after power-up */
  755. for (i = 1; i < 6; i++) {
  756. lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
  757. lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
  758. }
  759. for (i = 0; i < 2; i++) {
  760. lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
  761. lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
  762. lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
  763. lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
  764. }
  765. if (data->channel & CHAN_TEMP3) {
  766. lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
  767. lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
  768. } else {
  769. lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
  770. lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
  771. }
  772. }
  773. /* Make sure Start is set and INT#_Clear is clear */
  774. if ((data->config & 0x09) != 0x01)
  775. lm87_write_value(client, LM87_REG_CONFIG,
  776. (data->config & 0x77) | 0x01);
  777. return 0;
  778. }
  779. static int lm87_probe(struct i2c_client *client)
  780. {
  781. struct lm87_data *data;
  782. struct device *hwmon_dev;
  783. int err;
  784. unsigned int group_tail = 0;
  785. data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
  786. if (!data)
  787. return -ENOMEM;
  788. i2c_set_clientdata(client, data);
  789. mutex_init(&data->update_lock);
  790. /* Initialize the LM87 chip */
  791. err = lm87_init_client(client);
  792. if (err)
  793. return err;
  794. data->in_scale[0] = 2500;
  795. data->in_scale[1] = 2700;
  796. data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
  797. data->in_scale[3] = 5000;
  798. data->in_scale[4] = 12000;
  799. data->in_scale[5] = 2700;
  800. data->in_scale[6] = 1875;
  801. data->in_scale[7] = 1875;
  802. /*
  803. * Construct the list of attributes, the list depends on the
  804. * configuration of the chip
  805. */
  806. data->attr_groups[group_tail++] = &lm87_group;
  807. if (data->channel & CHAN_NO_FAN(0))
  808. data->attr_groups[group_tail++] = &lm87_group_in6;
  809. else
  810. data->attr_groups[group_tail++] = &lm87_group_fan1;
  811. if (data->channel & CHAN_NO_FAN(1))
  812. data->attr_groups[group_tail++] = &lm87_group_in7;
  813. else
  814. data->attr_groups[group_tail++] = &lm87_group_fan2;
  815. if (data->channel & CHAN_TEMP3)
  816. data->attr_groups[group_tail++] = &lm87_group_temp3;
  817. else
  818. data->attr_groups[group_tail++] = &lm87_group_in0_5;
  819. if (!(data->channel & CHAN_NO_VID)) {
  820. data->vrm = vid_which_vrm();
  821. data->attr_groups[group_tail++] = &lm87_group_vid;
  822. }
  823. hwmon_dev = devm_hwmon_device_register_with_groups(
  824. &client->dev, client->name, client, data->attr_groups);
  825. return PTR_ERR_OR_ZERO(hwmon_dev);
  826. }
  827. /*
  828. * Driver data (common to all clients)
  829. */
  830. static const struct i2c_device_id lm87_id[] = {
  831. { "lm87", 0 },
  832. { "adm1024", 0 },
  833. { }
  834. };
  835. MODULE_DEVICE_TABLE(i2c, lm87_id);
  836. static const struct of_device_id lm87_of_match[] = {
  837. { .compatible = "ti,lm87" },
  838. { .compatible = "adi,adm1024" },
  839. { },
  840. };
  841. MODULE_DEVICE_TABLE(of, lm87_of_match);
  842. static struct i2c_driver lm87_driver = {
  843. .class = I2C_CLASS_HWMON,
  844. .driver = {
  845. .name = "lm87",
  846. .of_match_table = lm87_of_match,
  847. },
  848. .probe_new = lm87_probe,
  849. .id_table = lm87_id,
  850. .detect = lm87_detect,
  851. .address_list = normal_i2c,
  852. };
  853. module_i2c_driver(lm87_driver);
  854. MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");
  855. MODULE_DESCRIPTION("LM87 driver");
  856. MODULE_LICENSE("GPL");