adt7x10.c 10 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware
  4. * monitoring
  5. * This driver handles the ADT7410 and compatible digital temperature sensors.
  6. * Hartmut Knaack <[email protected]> 2012-07-22
  7. * based on lm75.c by Frodo Looijaard <[email protected]>
  8. * and adt7410.c from iio-staging by Sonic Zhang <[email protected]>
  9. */
  10. #include <linux/device.h>
  11. #include <linux/module.h>
  12. #include <linux/init.h>
  13. #include <linux/slab.h>
  14. #include <linux/jiffies.h>
  15. #include <linux/hwmon.h>
  16. #include <linux/err.h>
  17. #include <linux/mutex.h>
  18. #include <linux/delay.h>
  19. #include <linux/interrupt.h>
  20. #include <linux/regmap.h>
  21. #include "adt7x10.h"
  22. /*
  23. * ADT7X10 status
  24. */
  25. #define ADT7X10_STAT_T_LOW (1 << 4)
  26. #define ADT7X10_STAT_T_HIGH (1 << 5)
  27. #define ADT7X10_STAT_T_CRIT (1 << 6)
  28. #define ADT7X10_STAT_NOT_RDY (1 << 7)
  29. /*
  30. * ADT7X10 config
  31. */
  32. #define ADT7X10_FAULT_QUEUE_MASK (1 << 0 | 1 << 1)
  33. #define ADT7X10_CT_POLARITY (1 << 2)
  34. #define ADT7X10_INT_POLARITY (1 << 3)
  35. #define ADT7X10_EVENT_MODE (1 << 4)
  36. #define ADT7X10_MODE_MASK (1 << 5 | 1 << 6)
  37. #define ADT7X10_FULL (0 << 5 | 0 << 6)
  38. #define ADT7X10_PD (1 << 5 | 1 << 6)
  39. #define ADT7X10_RESOLUTION (1 << 7)
  40. /*
  41. * ADT7X10 masks
  42. */
  43. #define ADT7X10_T13_VALUE_MASK 0xFFF8
  44. #define ADT7X10_T_HYST_MASK 0xF
  45. /* straight from the datasheet */
  46. #define ADT7X10_TEMP_MIN (-55000)
  47. #define ADT7X10_TEMP_MAX 150000
  48. /* Each client has this additional data */
  49. struct adt7x10_data {
  50. struct regmap *regmap;
  51. struct mutex update_lock;
  52. u8 config;
  53. u8 oldconfig;
  54. bool valid; /* true if temperature valid */
  55. };
  56. enum {
  57. adt7x10_temperature = 0,
  58. adt7x10_t_alarm_high,
  59. adt7x10_t_alarm_low,
  60. adt7x10_t_crit,
  61. };
  62. static const u8 ADT7X10_REG_TEMP[] = {
  63. [adt7x10_temperature] = ADT7X10_TEMPERATURE, /* input */
  64. [adt7x10_t_alarm_high] = ADT7X10_T_ALARM_HIGH, /* high */
  65. [adt7x10_t_alarm_low] = ADT7X10_T_ALARM_LOW, /* low */
  66. [adt7x10_t_crit] = ADT7X10_T_CRIT, /* critical */
  67. };
  68. static irqreturn_t adt7x10_irq_handler(int irq, void *private)
  69. {
  70. struct device *dev = private;
  71. struct adt7x10_data *d = dev_get_drvdata(dev);
  72. unsigned int status;
  73. int ret;
  74. ret = regmap_read(d->regmap, ADT7X10_STATUS, &status);
  75. if (ret < 0)
  76. return IRQ_HANDLED;
  77. if (status & ADT7X10_STAT_T_HIGH)
  78. hwmon_notify_event(dev, hwmon_temp, hwmon_temp_max_alarm, 0);
  79. if (status & ADT7X10_STAT_T_LOW)
  80. hwmon_notify_event(dev, hwmon_temp, hwmon_temp_min_alarm, 0);
  81. if (status & ADT7X10_STAT_T_CRIT)
  82. hwmon_notify_event(dev, hwmon_temp, hwmon_temp_crit_alarm, 0);
  83. return IRQ_HANDLED;
  84. }
  85. static int adt7x10_temp_ready(struct regmap *regmap)
  86. {
  87. unsigned int status;
  88. int i, ret;
  89. for (i = 0; i < 6; i++) {
  90. ret = regmap_read(regmap, ADT7X10_STATUS, &status);
  91. if (ret < 0)
  92. return ret;
  93. if (!(status & ADT7X10_STAT_NOT_RDY))
  94. return 0;
  95. msleep(60);
  96. }
  97. return -ETIMEDOUT;
  98. }
  99. static s16 ADT7X10_TEMP_TO_REG(long temp)
  100. {
  101. return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN,
  102. ADT7X10_TEMP_MAX) * 128, 1000);
  103. }
  104. static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg)
  105. {
  106. /* in 13 bit mode, bits 0-2 are status flags - mask them out */
  107. if (!(data->config & ADT7X10_RESOLUTION))
  108. reg &= ADT7X10_T13_VALUE_MASK;
  109. /*
  110. * temperature is stored in twos complement format, in steps of
  111. * 1/128°C
  112. */
  113. return DIV_ROUND_CLOSEST(reg * 1000, 128);
  114. }
  115. /*-----------------------------------------------------------------------*/
  116. static int adt7x10_temp_read(struct adt7x10_data *data, int index, long *val)
  117. {
  118. unsigned int regval;
  119. int ret;
  120. mutex_lock(&data->update_lock);
  121. if (index == adt7x10_temperature && !data->valid) {
  122. /* wait for valid temperature */
  123. ret = adt7x10_temp_ready(data->regmap);
  124. if (ret) {
  125. mutex_unlock(&data->update_lock);
  126. return ret;
  127. }
  128. data->valid = true;
  129. }
  130. mutex_unlock(&data->update_lock);
  131. ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], &regval);
  132. if (ret)
  133. return ret;
  134. *val = ADT7X10_REG_TO_TEMP(data, regval);
  135. return 0;
  136. }
  137. static int adt7x10_temp_write(struct adt7x10_data *data, int index, long temp)
  138. {
  139. int ret;
  140. mutex_lock(&data->update_lock);
  141. ret = regmap_write(data->regmap, ADT7X10_REG_TEMP[index],
  142. ADT7X10_TEMP_TO_REG(temp));
  143. mutex_unlock(&data->update_lock);
  144. return ret;
  145. }
  146. static int adt7x10_hyst_read(struct adt7x10_data *data, int index, long *val)
  147. {
  148. int hyst, temp, ret;
  149. mutex_lock(&data->update_lock);
  150. ret = regmap_read(data->regmap, ADT7X10_T_HYST, &hyst);
  151. if (ret) {
  152. mutex_unlock(&data->update_lock);
  153. return ret;
  154. }
  155. ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], &temp);
  156. mutex_unlock(&data->update_lock);
  157. if (ret)
  158. return ret;
  159. hyst = (hyst & ADT7X10_T_HYST_MASK) * 1000;
  160. /*
  161. * hysteresis is stored as a 4 bit offset in the device, convert it
  162. * to an absolute value
  163. */
  164. /* min has positive offset, others have negative */
  165. if (index == adt7x10_t_alarm_low)
  166. hyst = -hyst;
  167. *val = ADT7X10_REG_TO_TEMP(data, temp) - hyst;
  168. return 0;
  169. }
  170. static int adt7x10_hyst_write(struct adt7x10_data *data, long hyst)
  171. {
  172. unsigned int regval;
  173. int limit, ret;
  174. mutex_lock(&data->update_lock);
  175. /* convert absolute hysteresis value to a 4 bit delta value */
  176. ret = regmap_read(data->regmap, ADT7X10_T_ALARM_HIGH, &regval);
  177. if (ret < 0)
  178. goto abort;
  179. limit = ADT7X10_REG_TO_TEMP(data, regval);
  180. hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
  181. regval = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0,
  182. ADT7X10_T_HYST_MASK);
  183. ret = regmap_write(data->regmap, ADT7X10_T_HYST, regval);
  184. abort:
  185. mutex_unlock(&data->update_lock);
  186. return ret;
  187. }
  188. static int adt7x10_alarm_read(struct adt7x10_data *data, int index, long *val)
  189. {
  190. unsigned int status;
  191. int ret;
  192. ret = regmap_read(data->regmap, ADT7X10_STATUS, &status);
  193. if (ret < 0)
  194. return ret;
  195. *val = !!(status & index);
  196. return 0;
  197. }
  198. static umode_t adt7x10_is_visible(const void *data,
  199. enum hwmon_sensor_types type,
  200. u32 attr, int channel)
  201. {
  202. switch (attr) {
  203. case hwmon_temp_max:
  204. case hwmon_temp_min:
  205. case hwmon_temp_crit:
  206. case hwmon_temp_max_hyst:
  207. return 0644;
  208. case hwmon_temp_input:
  209. case hwmon_temp_min_alarm:
  210. case hwmon_temp_max_alarm:
  211. case hwmon_temp_crit_alarm:
  212. case hwmon_temp_min_hyst:
  213. case hwmon_temp_crit_hyst:
  214. return 0444;
  215. default:
  216. break;
  217. }
  218. return 0;
  219. }
  220. static int adt7x10_read(struct device *dev, enum hwmon_sensor_types type,
  221. u32 attr, int channel, long *val)
  222. {
  223. struct adt7x10_data *data = dev_get_drvdata(dev);
  224. switch (attr) {
  225. case hwmon_temp_input:
  226. return adt7x10_temp_read(data, adt7x10_temperature, val);
  227. case hwmon_temp_max:
  228. return adt7x10_temp_read(data, adt7x10_t_alarm_high, val);
  229. case hwmon_temp_min:
  230. return adt7x10_temp_read(data, adt7x10_t_alarm_low, val);
  231. case hwmon_temp_crit:
  232. return adt7x10_temp_read(data, adt7x10_t_crit, val);
  233. case hwmon_temp_max_hyst:
  234. return adt7x10_hyst_read(data, adt7x10_t_alarm_high, val);
  235. case hwmon_temp_min_hyst:
  236. return adt7x10_hyst_read(data, adt7x10_t_alarm_low, val);
  237. case hwmon_temp_crit_hyst:
  238. return adt7x10_hyst_read(data, adt7x10_t_crit, val);
  239. case hwmon_temp_min_alarm:
  240. return adt7x10_alarm_read(data, ADT7X10_STAT_T_LOW, val);
  241. case hwmon_temp_max_alarm:
  242. return adt7x10_alarm_read(data, ADT7X10_STAT_T_HIGH, val);
  243. case hwmon_temp_crit_alarm:
  244. return adt7x10_alarm_read(data, ADT7X10_STAT_T_CRIT, val);
  245. default:
  246. return -EOPNOTSUPP;
  247. }
  248. }
  249. static int adt7x10_write(struct device *dev, enum hwmon_sensor_types type,
  250. u32 attr, int channel, long val)
  251. {
  252. struct adt7x10_data *data = dev_get_drvdata(dev);
  253. switch (attr) {
  254. case hwmon_temp_max:
  255. return adt7x10_temp_write(data, adt7x10_t_alarm_high, val);
  256. case hwmon_temp_min:
  257. return adt7x10_temp_write(data, adt7x10_t_alarm_low, val);
  258. case hwmon_temp_crit:
  259. return adt7x10_temp_write(data, adt7x10_t_crit, val);
  260. case hwmon_temp_max_hyst:
  261. return adt7x10_hyst_write(data, val);
  262. default:
  263. return -EOPNOTSUPP;
  264. }
  265. }
  266. static const struct hwmon_channel_info *adt7x10_info[] = {
  267. HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
  268. HWMON_T_CRIT | HWMON_T_MAX_HYST | HWMON_T_MIN_HYST |
  269. HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
  270. HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM),
  271. NULL,
  272. };
  273. static const struct hwmon_ops adt7x10_hwmon_ops = {
  274. .is_visible = adt7x10_is_visible,
  275. .read = adt7x10_read,
  276. .write = adt7x10_write,
  277. };
  278. static const struct hwmon_chip_info adt7x10_chip_info = {
  279. .ops = &adt7x10_hwmon_ops,
  280. .info = adt7x10_info,
  281. };
  282. static void adt7x10_restore_config(void *private)
  283. {
  284. struct adt7x10_data *data = private;
  285. regmap_write(data->regmap, ADT7X10_CONFIG, data->oldconfig);
  286. }
  287. int adt7x10_probe(struct device *dev, const char *name, int irq,
  288. struct regmap *regmap)
  289. {
  290. struct adt7x10_data *data;
  291. unsigned int config;
  292. struct device *hdev;
  293. int ret;
  294. data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
  295. if (!data)
  296. return -ENOMEM;
  297. data->regmap = regmap;
  298. dev_set_drvdata(dev, data);
  299. mutex_init(&data->update_lock);
  300. /* configure as specified */
  301. ret = regmap_read(regmap, ADT7X10_CONFIG, &config);
  302. if (ret < 0) {
  303. dev_dbg(dev, "Can't read config? %d\n", ret);
  304. return ret;
  305. }
  306. data->oldconfig = config;
  307. /*
  308. * Set to 16 bit resolution, continous conversion and comparator mode.
  309. */
  310. data->config = data->oldconfig;
  311. data->config &= ~(ADT7X10_MODE_MASK | ADT7X10_CT_POLARITY |
  312. ADT7X10_INT_POLARITY);
  313. data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE;
  314. if (data->config != data->oldconfig) {
  315. ret = regmap_write(regmap, ADT7X10_CONFIG, data->config);
  316. if (ret)
  317. return ret;
  318. ret = devm_add_action_or_reset(dev, adt7x10_restore_config, data);
  319. if (ret)
  320. return ret;
  321. }
  322. dev_dbg(dev, "Config %02x\n", data->config);
  323. hdev = devm_hwmon_device_register_with_info(dev, name, data,
  324. &adt7x10_chip_info, NULL);
  325. if (IS_ERR(hdev))
  326. return PTR_ERR(hdev);
  327. if (irq > 0) {
  328. ret = devm_request_threaded_irq(dev, irq, NULL,
  329. adt7x10_irq_handler,
  330. IRQF_TRIGGER_FALLING |
  331. IRQF_ONESHOT,
  332. dev_name(dev), hdev);
  333. if (ret)
  334. return ret;
  335. }
  336. return 0;
  337. }
  338. EXPORT_SYMBOL_GPL(adt7x10_probe);
  339. static int adt7x10_suspend(struct device *dev)
  340. {
  341. struct adt7x10_data *data = dev_get_drvdata(dev);
  342. return regmap_write(data->regmap, ADT7X10_CONFIG,
  343. data->config | ADT7X10_PD);
  344. }
  345. static int adt7x10_resume(struct device *dev)
  346. {
  347. struct adt7x10_data *data = dev_get_drvdata(dev);
  348. return regmap_write(data->regmap, ADT7X10_CONFIG, data->config);
  349. }
  350. EXPORT_SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
  351. MODULE_AUTHOR("Hartmut Knaack");
  352. MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
  353. MODULE_LICENSE("GPL");