max6697.c 23 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright (c) 2012 Guenter Roeck <[email protected]>
  4. *
  5. * based on max1668.c
  6. * Copyright (c) 2011 David George <[email protected]>
  7. */
  8. #include <linux/module.h>
  9. #include <linux/init.h>
  10. #include <linux/slab.h>
  11. #include <linux/jiffies.h>
  12. #include <linux/i2c.h>
  13. #include <linux/hwmon.h>
  14. #include <linux/hwmon-sysfs.h>
  15. #include <linux/err.h>
  16. #include <linux/mutex.h>
  17. #include <linux/of_device.h>
  18. #include <linux/of.h>
  19. #include <linux/platform_data/max6697.h>
  20. enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
  21. max6697, max6698, max6699 };
  22. /* Report local sensor as temp1 */
  23. static const u8 MAX6697_REG_TEMP[] = {
  24. 0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
  25. static const u8 MAX6697_REG_TEMP_EXT[] = {
  26. 0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
  27. static const u8 MAX6697_REG_MAX[] = {
  28. 0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
  29. static const u8 MAX6697_REG_CRIT[] = {
  30. 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
  31. /*
  32. * Map device tree / platform data register bit map to chip bit map.
  33. * Applies to alert register and over-temperature register.
  34. */
  35. #define MAX6697_ALERT_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \
  36. (((reg) & 0x01) << 6) | ((reg) & 0x80))
  37. #define MAX6697_OVERT_MAP_BITS(reg) (((reg) >> 1) | (((reg) & 0x01) << 7))
  38. #define MAX6697_REG_STAT(n) (0x44 + (n))
  39. #define MAX6697_REG_CONFIG 0x41
  40. #define MAX6581_CONF_EXTENDED (1 << 1)
  41. #define MAX6693_CONF_BETA (1 << 2)
  42. #define MAX6697_CONF_RESISTANCE (1 << 3)
  43. #define MAX6697_CONF_TIMEOUT (1 << 5)
  44. #define MAX6697_REG_ALERT_MASK 0x42
  45. #define MAX6697_REG_OVERT_MASK 0x43
  46. #define MAX6581_REG_RESISTANCE 0x4a
  47. #define MAX6581_REG_IDEALITY 0x4b
  48. #define MAX6581_REG_IDEALITY_SELECT 0x4c
  49. #define MAX6581_REG_OFFSET 0x4d
  50. #define MAX6581_REG_OFFSET_SELECT 0x4e
  51. #define MAX6581_OFFSET_MIN -31750
  52. #define MAX6581_OFFSET_MAX 31750
  53. #define MAX6697_CONV_TIME 156 /* ms per channel, worst case */
  54. struct max6697_chip_data {
  55. int channels;
  56. u32 have_ext;
  57. u32 have_crit;
  58. u32 have_fault;
  59. u8 valid_conf;
  60. const u8 *alarm_map;
  61. };
  62. struct max6697_data {
  63. struct i2c_client *client;
  64. enum chips type;
  65. const struct max6697_chip_data *chip;
  66. int update_interval; /* in milli-seconds */
  67. int temp_offset; /* in degrees C */
  68. struct mutex update_lock;
  69. unsigned long last_updated; /* In jiffies */
  70. bool valid; /* true if following fields are valid */
  71. /* 1x local and up to 7x remote */
  72. u8 temp[8][4]; /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
  73. #define MAX6697_TEMP_INPUT 0
  74. #define MAX6697_TEMP_EXT 1
  75. #define MAX6697_TEMP_MAX 2
  76. #define MAX6697_TEMP_CRIT 3
  77. u32 alarms;
  78. };
  79. /* Diode fault status bits on MAX6581 are right shifted by one bit */
  80. static const u8 max6581_alarm_map[] = {
  81. 0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
  82. 16, 17, 18, 19, 20, 21, 22, 23 };
  83. static const struct max6697_chip_data max6697_chip_data[] = {
  84. [max6581] = {
  85. .channels = 8,
  86. .have_crit = 0xff,
  87. .have_ext = 0x7f,
  88. .have_fault = 0xfe,
  89. .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
  90. .alarm_map = max6581_alarm_map,
  91. },
  92. [max6602] = {
  93. .channels = 5,
  94. .have_crit = 0x12,
  95. .have_ext = 0x02,
  96. .have_fault = 0x1e,
  97. .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  98. },
  99. [max6622] = {
  100. .channels = 5,
  101. .have_crit = 0x12,
  102. .have_ext = 0x02,
  103. .have_fault = 0x1e,
  104. .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  105. },
  106. [max6636] = {
  107. .channels = 7,
  108. .have_crit = 0x72,
  109. .have_ext = 0x02,
  110. .have_fault = 0x7e,
  111. .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  112. },
  113. [max6689] = {
  114. .channels = 7,
  115. .have_crit = 0x72,
  116. .have_ext = 0x02,
  117. .have_fault = 0x7e,
  118. .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  119. },
  120. [max6693] = {
  121. .channels = 7,
  122. .have_crit = 0x72,
  123. .have_ext = 0x02,
  124. .have_fault = 0x7e,
  125. .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
  126. MAX6697_CONF_TIMEOUT,
  127. },
  128. [max6694] = {
  129. .channels = 5,
  130. .have_crit = 0x12,
  131. .have_ext = 0x02,
  132. .have_fault = 0x1e,
  133. .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
  134. MAX6697_CONF_TIMEOUT,
  135. },
  136. [max6697] = {
  137. .channels = 7,
  138. .have_crit = 0x72,
  139. .have_ext = 0x02,
  140. .have_fault = 0x7e,
  141. .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  142. },
  143. [max6698] = {
  144. .channels = 7,
  145. .have_crit = 0x72,
  146. .have_ext = 0x02,
  147. .have_fault = 0x0e,
  148. .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  149. },
  150. [max6699] = {
  151. .channels = 5,
  152. .have_crit = 0x12,
  153. .have_ext = 0x02,
  154. .have_fault = 0x1e,
  155. .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  156. },
  157. };
  158. static inline int max6581_offset_to_millic(int val)
  159. {
  160. return sign_extend32(val, 7) * 250;
  161. }
  162. static struct max6697_data *max6697_update_device(struct device *dev)
  163. {
  164. struct max6697_data *data = dev_get_drvdata(dev);
  165. struct i2c_client *client = data->client;
  166. struct max6697_data *ret = data;
  167. int val;
  168. int i;
  169. u32 alarms;
  170. mutex_lock(&data->update_lock);
  171. if (data->valid &&
  172. !time_after(jiffies, data->last_updated
  173. + msecs_to_jiffies(data->update_interval)))
  174. goto abort;
  175. for (i = 0; i < data->chip->channels; i++) {
  176. if (data->chip->have_ext & (1 << i)) {
  177. val = i2c_smbus_read_byte_data(client,
  178. MAX6697_REG_TEMP_EXT[i]);
  179. if (unlikely(val < 0)) {
  180. ret = ERR_PTR(val);
  181. goto abort;
  182. }
  183. data->temp[i][MAX6697_TEMP_EXT] = val;
  184. }
  185. val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
  186. if (unlikely(val < 0)) {
  187. ret = ERR_PTR(val);
  188. goto abort;
  189. }
  190. data->temp[i][MAX6697_TEMP_INPUT] = val;
  191. val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
  192. if (unlikely(val < 0)) {
  193. ret = ERR_PTR(val);
  194. goto abort;
  195. }
  196. data->temp[i][MAX6697_TEMP_MAX] = val;
  197. if (data->chip->have_crit & (1 << i)) {
  198. val = i2c_smbus_read_byte_data(client,
  199. MAX6697_REG_CRIT[i]);
  200. if (unlikely(val < 0)) {
  201. ret = ERR_PTR(val);
  202. goto abort;
  203. }
  204. data->temp[i][MAX6697_TEMP_CRIT] = val;
  205. }
  206. }
  207. alarms = 0;
  208. for (i = 0; i < 3; i++) {
  209. val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
  210. if (unlikely(val < 0)) {
  211. ret = ERR_PTR(val);
  212. goto abort;
  213. }
  214. alarms = (alarms << 8) | val;
  215. }
  216. data->alarms = alarms;
  217. data->last_updated = jiffies;
  218. data->valid = true;
  219. abort:
  220. mutex_unlock(&data->update_lock);
  221. return ret;
  222. }
  223. static ssize_t temp_input_show(struct device *dev,
  224. struct device_attribute *devattr, char *buf)
  225. {
  226. int index = to_sensor_dev_attr(devattr)->index;
  227. struct max6697_data *data = max6697_update_device(dev);
  228. int temp;
  229. if (IS_ERR(data))
  230. return PTR_ERR(data);
  231. temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
  232. temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
  233. return sprintf(buf, "%d\n", temp * 125);
  234. }
  235. static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
  236. char *buf)
  237. {
  238. int nr = to_sensor_dev_attr_2(devattr)->nr;
  239. int index = to_sensor_dev_attr_2(devattr)->index;
  240. struct max6697_data *data = max6697_update_device(dev);
  241. int temp;
  242. if (IS_ERR(data))
  243. return PTR_ERR(data);
  244. temp = data->temp[nr][index];
  245. temp -= data->temp_offset;
  246. return sprintf(buf, "%d\n", temp * 1000);
  247. }
  248. static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
  249. char *buf)
  250. {
  251. int index = to_sensor_dev_attr(attr)->index;
  252. struct max6697_data *data = max6697_update_device(dev);
  253. if (IS_ERR(data))
  254. return PTR_ERR(data);
  255. if (data->chip->alarm_map)
  256. index = data->chip->alarm_map[index];
  257. return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
  258. }
  259. static ssize_t temp_store(struct device *dev,
  260. struct device_attribute *devattr, const char *buf,
  261. size_t count)
  262. {
  263. int nr = to_sensor_dev_attr_2(devattr)->nr;
  264. int index = to_sensor_dev_attr_2(devattr)->index;
  265. struct max6697_data *data = dev_get_drvdata(dev);
  266. long temp;
  267. int ret;
  268. ret = kstrtol(buf, 10, &temp);
  269. if (ret < 0)
  270. return ret;
  271. mutex_lock(&data->update_lock);
  272. temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
  273. temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
  274. data->temp[nr][index] = temp;
  275. ret = i2c_smbus_write_byte_data(data->client,
  276. index == 2 ? MAX6697_REG_MAX[nr]
  277. : MAX6697_REG_CRIT[nr],
  278. temp);
  279. mutex_unlock(&data->update_lock);
  280. return ret < 0 ? ret : count;
  281. }
  282. static ssize_t offset_store(struct device *dev, struct device_attribute *devattr, const char *buf,
  283. size_t count)
  284. {
  285. int val, ret, index, select;
  286. struct max6697_data *data;
  287. bool channel_enabled;
  288. long temp;
  289. index = to_sensor_dev_attr(devattr)->index;
  290. data = dev_get_drvdata(dev);
  291. ret = kstrtol(buf, 10, &temp);
  292. if (ret < 0)
  293. return ret;
  294. mutex_lock(&data->update_lock);
  295. select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
  296. if (select < 0) {
  297. ret = select;
  298. goto abort;
  299. }
  300. channel_enabled = (select & (1 << (index - 1)));
  301. temp = clamp_val(temp, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX);
  302. val = DIV_ROUND_CLOSEST(temp, 250);
  303. /* disable the offset for channel if the new offset is 0 */
  304. if (val == 0) {
  305. if (channel_enabled)
  306. ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
  307. select & ~(1 << (index - 1)));
  308. ret = ret < 0 ? ret : count;
  309. goto abort;
  310. }
  311. if (!channel_enabled) {
  312. ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
  313. select | (1 << (index - 1)));
  314. if (ret < 0)
  315. goto abort;
  316. }
  317. ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET, val);
  318. ret = ret < 0 ? ret : count;
  319. abort:
  320. mutex_unlock(&data->update_lock);
  321. return ret;
  322. }
  323. static ssize_t offset_show(struct device *dev, struct device_attribute *devattr, char *buf)
  324. {
  325. struct max6697_data *data;
  326. int select, ret, index;
  327. index = to_sensor_dev_attr(devattr)->index;
  328. data = dev_get_drvdata(dev);
  329. mutex_lock(&data->update_lock);
  330. select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
  331. if (select < 0)
  332. ret = select;
  333. else if (select & (1 << (index - 1)))
  334. ret = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET);
  335. else
  336. ret = 0;
  337. mutex_unlock(&data->update_lock);
  338. return ret < 0 ? ret : sprintf(buf, "%d\n", max6581_offset_to_millic(ret));
  339. }
  340. static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
  341. static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
  342. static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
  343. static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
  344. static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
  345. static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
  346. static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
  347. static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
  348. static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
  349. static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
  350. static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
  351. static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
  352. static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
  353. static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
  354. static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
  355. static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
  356. static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
  357. static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
  358. static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
  359. static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
  360. static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
  361. static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
  362. static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
  363. static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
  364. static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
  365. static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
  366. static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
  367. static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
  368. static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
  369. static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
  370. static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
  371. static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
  372. static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
  373. static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
  374. static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
  375. static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
  376. static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
  377. static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
  378. static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
  379. static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
  380. static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
  381. static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
  382. static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
  383. static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
  384. static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
  385. static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
  386. static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
  387. /* There is no offset for local temperature so starting from temp2 */
  388. static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 1);
  389. static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 2);
  390. static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 3);
  391. static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 4);
  392. static SENSOR_DEVICE_ATTR_RW(temp6_offset, offset, 5);
  393. static SENSOR_DEVICE_ATTR_RW(temp7_offset, offset, 6);
  394. static SENSOR_DEVICE_ATTR_RW(temp8_offset, offset, 7);
  395. static DEVICE_ATTR(dummy, 0, NULL, NULL);
  396. static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
  397. int index)
  398. {
  399. struct device *dev = kobj_to_dev(kobj);
  400. struct max6697_data *data = dev_get_drvdata(dev);
  401. const struct max6697_chip_data *chip = data->chip;
  402. int channel = index / 7; /* channel number */
  403. int nr = index % 7; /* attribute index within channel */
  404. if (channel >= chip->channels)
  405. return 0;
  406. if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
  407. return 0;
  408. if (nr == 5 && !(chip->have_fault & (1 << channel)))
  409. return 0;
  410. /* offset reg is only supported on max6581 remote channels */
  411. if (nr == 6)
  412. if (data->type != max6581 || channel == 0)
  413. return 0;
  414. return attr->mode;
  415. }
  416. /*
  417. * max6697_is_visible uses the index into the following array to determine
  418. * if attributes should be created or not. Any change in order or content
  419. * must be matched in max6697_is_visible.
  420. */
  421. static struct attribute *max6697_attributes[] = {
  422. &sensor_dev_attr_temp1_input.dev_attr.attr,
  423. &sensor_dev_attr_temp1_max.dev_attr.attr,
  424. &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
  425. &sensor_dev_attr_temp1_crit.dev_attr.attr,
  426. &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
  427. &dev_attr_dummy.attr,
  428. &dev_attr_dummy.attr,
  429. &sensor_dev_attr_temp2_input.dev_attr.attr,
  430. &sensor_dev_attr_temp2_max.dev_attr.attr,
  431. &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
  432. &sensor_dev_attr_temp2_crit.dev_attr.attr,
  433. &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
  434. &sensor_dev_attr_temp2_fault.dev_attr.attr,
  435. &sensor_dev_attr_temp2_offset.dev_attr.attr,
  436. &sensor_dev_attr_temp3_input.dev_attr.attr,
  437. &sensor_dev_attr_temp3_max.dev_attr.attr,
  438. &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
  439. &sensor_dev_attr_temp3_crit.dev_attr.attr,
  440. &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
  441. &sensor_dev_attr_temp3_fault.dev_attr.attr,
  442. &sensor_dev_attr_temp3_offset.dev_attr.attr,
  443. &sensor_dev_attr_temp4_input.dev_attr.attr,
  444. &sensor_dev_attr_temp4_max.dev_attr.attr,
  445. &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
  446. &sensor_dev_attr_temp4_crit.dev_attr.attr,
  447. &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
  448. &sensor_dev_attr_temp4_fault.dev_attr.attr,
  449. &sensor_dev_attr_temp4_offset.dev_attr.attr,
  450. &sensor_dev_attr_temp5_input.dev_attr.attr,
  451. &sensor_dev_attr_temp5_max.dev_attr.attr,
  452. &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
  453. &sensor_dev_attr_temp5_crit.dev_attr.attr,
  454. &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
  455. &sensor_dev_attr_temp5_fault.dev_attr.attr,
  456. &sensor_dev_attr_temp5_offset.dev_attr.attr,
  457. &sensor_dev_attr_temp6_input.dev_attr.attr,
  458. &sensor_dev_attr_temp6_max.dev_attr.attr,
  459. &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
  460. &sensor_dev_attr_temp6_crit.dev_attr.attr,
  461. &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
  462. &sensor_dev_attr_temp6_fault.dev_attr.attr,
  463. &sensor_dev_attr_temp6_offset.dev_attr.attr,
  464. &sensor_dev_attr_temp7_input.dev_attr.attr,
  465. &sensor_dev_attr_temp7_max.dev_attr.attr,
  466. &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
  467. &sensor_dev_attr_temp7_crit.dev_attr.attr,
  468. &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
  469. &sensor_dev_attr_temp7_fault.dev_attr.attr,
  470. &sensor_dev_attr_temp7_offset.dev_attr.attr,
  471. &sensor_dev_attr_temp8_input.dev_attr.attr,
  472. &sensor_dev_attr_temp8_max.dev_attr.attr,
  473. &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
  474. &sensor_dev_attr_temp8_crit.dev_attr.attr,
  475. &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
  476. &sensor_dev_attr_temp8_fault.dev_attr.attr,
  477. &sensor_dev_attr_temp8_offset.dev_attr.attr,
  478. NULL
  479. };
  480. static const struct attribute_group max6697_group = {
  481. .attrs = max6697_attributes, .is_visible = max6697_is_visible,
  482. };
  483. __ATTRIBUTE_GROUPS(max6697);
  484. static void max6697_get_config_of(struct device_node *node,
  485. struct max6697_platform_data *pdata)
  486. {
  487. int len;
  488. const __be32 *prop;
  489. pdata->smbus_timeout_disable =
  490. of_property_read_bool(node, "smbus-timeout-disable");
  491. pdata->extended_range_enable =
  492. of_property_read_bool(node, "extended-range-enable");
  493. pdata->beta_compensation =
  494. of_property_read_bool(node, "beta-compensation-enable");
  495. prop = of_get_property(node, "alert-mask", &len);
  496. if (prop && len == sizeof(u32))
  497. pdata->alert_mask = be32_to_cpu(prop[0]);
  498. prop = of_get_property(node, "over-temperature-mask", &len);
  499. if (prop && len == sizeof(u32))
  500. pdata->over_temperature_mask = be32_to_cpu(prop[0]);
  501. prop = of_get_property(node, "resistance-cancellation", &len);
  502. if (prop) {
  503. if (len == sizeof(u32))
  504. pdata->resistance_cancellation = be32_to_cpu(prop[0]);
  505. else
  506. pdata->resistance_cancellation = 0xfe;
  507. }
  508. prop = of_get_property(node, "transistor-ideality", &len);
  509. if (prop && len == 2 * sizeof(u32)) {
  510. pdata->ideality_mask = be32_to_cpu(prop[0]);
  511. pdata->ideality_value = be32_to_cpu(prop[1]);
  512. }
  513. }
  514. static int max6697_init_chip(struct max6697_data *data,
  515. struct i2c_client *client)
  516. {
  517. struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
  518. struct max6697_platform_data p;
  519. const struct max6697_chip_data *chip = data->chip;
  520. int factor = chip->channels;
  521. int ret, reg;
  522. /*
  523. * Don't touch configuration if neither platform data nor OF
  524. * configuration was specified. If that is the case, use the
  525. * current chip configuration.
  526. */
  527. if (!pdata && !client->dev.of_node) {
  528. reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
  529. if (reg < 0)
  530. return reg;
  531. if (data->type == max6581) {
  532. if (reg & MAX6581_CONF_EXTENDED)
  533. data->temp_offset = 64;
  534. reg = i2c_smbus_read_byte_data(client,
  535. MAX6581_REG_RESISTANCE);
  536. if (reg < 0)
  537. return reg;
  538. factor += hweight8(reg);
  539. } else {
  540. if (reg & MAX6697_CONF_RESISTANCE)
  541. factor++;
  542. }
  543. goto done;
  544. }
  545. if (client->dev.of_node) {
  546. memset(&p, 0, sizeof(p));
  547. max6697_get_config_of(client->dev.of_node, &p);
  548. pdata = &p;
  549. }
  550. reg = 0;
  551. if (pdata->smbus_timeout_disable &&
  552. (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
  553. reg |= MAX6697_CONF_TIMEOUT;
  554. }
  555. if (pdata->extended_range_enable &&
  556. (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
  557. reg |= MAX6581_CONF_EXTENDED;
  558. data->temp_offset = 64;
  559. }
  560. if (pdata->resistance_cancellation &&
  561. (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
  562. reg |= MAX6697_CONF_RESISTANCE;
  563. factor++;
  564. }
  565. if (pdata->beta_compensation &&
  566. (chip->valid_conf & MAX6693_CONF_BETA)) {
  567. reg |= MAX6693_CONF_BETA;
  568. }
  569. ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
  570. if (ret < 0)
  571. return ret;
  572. ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
  573. MAX6697_ALERT_MAP_BITS(pdata->alert_mask));
  574. if (ret < 0)
  575. return ret;
  576. ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
  577. MAX6697_OVERT_MAP_BITS(pdata->over_temperature_mask));
  578. if (ret < 0)
  579. return ret;
  580. if (data->type == max6581) {
  581. factor += hweight8(pdata->resistance_cancellation >> 1);
  582. ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
  583. pdata->resistance_cancellation >> 1);
  584. if (ret < 0)
  585. return ret;
  586. ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
  587. pdata->ideality_value);
  588. if (ret < 0)
  589. return ret;
  590. ret = i2c_smbus_write_byte_data(client,
  591. MAX6581_REG_IDEALITY_SELECT,
  592. pdata->ideality_mask >> 1);
  593. if (ret < 0)
  594. return ret;
  595. }
  596. done:
  597. data->update_interval = factor * MAX6697_CONV_TIME;
  598. return 0;
  599. }
  600. static const struct i2c_device_id max6697_id[];
  601. static int max6697_probe(struct i2c_client *client)
  602. {
  603. struct i2c_adapter *adapter = client->adapter;
  604. struct device *dev = &client->dev;
  605. struct max6697_data *data;
  606. struct device *hwmon_dev;
  607. int err;
  608. if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  609. return -ENODEV;
  610. data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
  611. if (!data)
  612. return -ENOMEM;
  613. if (client->dev.of_node)
  614. data->type = (enum chips)of_device_get_match_data(&client->dev);
  615. else
  616. data->type = i2c_match_id(max6697_id, client)->driver_data;
  617. data->chip = &max6697_chip_data[data->type];
  618. data->client = client;
  619. mutex_init(&data->update_lock);
  620. err = max6697_init_chip(data, client);
  621. if (err)
  622. return err;
  623. hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
  624. data,
  625. max6697_groups);
  626. return PTR_ERR_OR_ZERO(hwmon_dev);
  627. }
  628. static const struct i2c_device_id max6697_id[] = {
  629. { "max6581", max6581 },
  630. { "max6602", max6602 },
  631. { "max6622", max6622 },
  632. { "max6636", max6636 },
  633. { "max6689", max6689 },
  634. { "max6693", max6693 },
  635. { "max6694", max6694 },
  636. { "max6697", max6697 },
  637. { "max6698", max6698 },
  638. { "max6699", max6699 },
  639. { }
  640. };
  641. MODULE_DEVICE_TABLE(i2c, max6697_id);
  642. static const struct of_device_id __maybe_unused max6697_of_match[] = {
  643. {
  644. .compatible = "maxim,max6581",
  645. .data = (void *)max6581
  646. },
  647. {
  648. .compatible = "maxim,max6602",
  649. .data = (void *)max6602
  650. },
  651. {
  652. .compatible = "maxim,max6622",
  653. .data = (void *)max6622
  654. },
  655. {
  656. .compatible = "maxim,max6636",
  657. .data = (void *)max6636
  658. },
  659. {
  660. .compatible = "maxim,max6689",
  661. .data = (void *)max6689
  662. },
  663. {
  664. .compatible = "maxim,max6693",
  665. .data = (void *)max6693
  666. },
  667. {
  668. .compatible = "maxim,max6694",
  669. .data = (void *)max6694
  670. },
  671. {
  672. .compatible = "maxim,max6697",
  673. .data = (void *)max6697
  674. },
  675. {
  676. .compatible = "maxim,max6698",
  677. .data = (void *)max6698
  678. },
  679. {
  680. .compatible = "maxim,max6699",
  681. .data = (void *)max6699
  682. },
  683. { },
  684. };
  685. MODULE_DEVICE_TABLE(of, max6697_of_match);
  686. static struct i2c_driver max6697_driver = {
  687. .class = I2C_CLASS_HWMON,
  688. .driver = {
  689. .name = "max6697",
  690. .of_match_table = of_match_ptr(max6697_of_match),
  691. },
  692. .probe_new = max6697_probe,
  693. .id_table = max6697_id,
  694. };
  695. module_i2c_driver(max6697_driver);
  696. MODULE_AUTHOR("Guenter Roeck <[email protected]>");
  697. MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
  698. MODULE_LICENSE("GPL");