pa12203001.c 11 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Copyright (c) 2015 Intel Corporation
  4. *
  5. * Driver for TXC PA12203001 Proximity and Ambient Light Sensor.
  6. *
  7. * To do: Interrupt support.
  8. */
  9. #include <linux/kernel.h>
  10. #include <linux/module.h>
  11. #include <linux/acpi.h>
  12. #include <linux/delay.h>
  13. #include <linux/i2c.h>
  14. #include <linux/iio/iio.h>
  15. #include <linux/iio/sysfs.h>
  16. #include <linux/mutex.h>
  17. #include <linux/pm.h>
  18. #include <linux/pm_runtime.h>
  19. #include <linux/regmap.h>
  20. #define PA12203001_DRIVER_NAME "pa12203001"
  21. #define PA12203001_REG_CFG0 0x00
  22. #define PA12203001_REG_CFG1 0x01
  23. #define PA12203001_REG_CFG2 0x02
  24. #define PA12203001_REG_CFG3 0x03
  25. #define PA12203001_REG_ADL 0x0b
  26. #define PA12203001_REG_PDH 0x0e
  27. #define PA12203001_REG_POFS 0x10
  28. #define PA12203001_REG_PSET 0x11
  29. #define PA12203001_ALS_EN_MASK BIT(0)
  30. #define PA12203001_PX_EN_MASK BIT(1)
  31. #define PA12203001_PX_NORMAL_MODE_MASK GENMASK(7, 6)
  32. #define PA12203001_AFSR_MASK GENMASK(5, 4)
  33. #define PA12203001_AFSR_SHIFT 4
  34. #define PA12203001_PSCAN 0x03
  35. /* als range 31000, ps, als disabled */
  36. #define PA12203001_REG_CFG0_DEFAULT 0x30
  37. /* led current: 100 mA */
  38. #define PA12203001_REG_CFG1_DEFAULT 0x20
  39. /* ps mode: normal, interrupts not active */
  40. #define PA12203001_REG_CFG2_DEFAULT 0xcc
  41. #define PA12203001_REG_CFG3_DEFAULT 0x00
  42. #define PA12203001_SLEEP_DELAY_MS 3000
  43. #define PA12203001_CHIP_ENABLE 0xff
  44. #define PA12203001_CHIP_DISABLE 0x00
  45. /* available scales: corresponding to [500, 4000, 7000, 31000] lux */
  46. static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029};
  47. struct pa12203001_data {
  48. struct i2c_client *client;
  49. /* protect device states */
  50. struct mutex lock;
  51. bool als_enabled;
  52. bool px_enabled;
  53. bool als_needs_enable;
  54. bool px_needs_enable;
  55. struct regmap *map;
  56. };
  57. static const struct {
  58. u8 reg;
  59. u8 val;
  60. } regvals[] = {
  61. {PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT},
  62. {PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT},
  63. {PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT},
  64. {PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT},
  65. {PA12203001_REG_PSET, PA12203001_PSCAN},
  66. };
  67. static IIO_CONST_ATTR(in_illuminance_scale_available,
  68. "0.007629 0.061036 0.106813 0.473029");
  69. static struct attribute *pa12203001_attrs[] = {
  70. &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
  71. NULL
  72. };
  73. static const struct attribute_group pa12203001_attr_group = {
  74. .attrs = pa12203001_attrs,
  75. };
  76. static const struct iio_chan_spec pa12203001_channels[] = {
  77. {
  78. .type = IIO_LIGHT,
  79. .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
  80. BIT(IIO_CHAN_INFO_SCALE),
  81. },
  82. {
  83. .type = IIO_PROXIMITY,
  84. .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  85. }
  86. };
  87. static const struct regmap_range pa12203001_volatile_regs_ranges[] = {
  88. regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1),
  89. regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH),
  90. };
  91. static const struct regmap_access_table pa12203001_volatile_regs = {
  92. .yes_ranges = pa12203001_volatile_regs_ranges,
  93. .n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges),
  94. };
  95. static const struct regmap_config pa12203001_regmap_config = {
  96. .reg_bits = 8,
  97. .val_bits = 8,
  98. .max_register = PA12203001_REG_PSET,
  99. .cache_type = REGCACHE_RBTREE,
  100. .volatile_table = &pa12203001_volatile_regs,
  101. };
  102. static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable)
  103. {
  104. int ret;
  105. ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
  106. PA12203001_ALS_EN_MASK, enable);
  107. if (ret < 0)
  108. return ret;
  109. data->als_enabled = !!enable;
  110. return 0;
  111. }
  112. static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable)
  113. {
  114. int ret;
  115. ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
  116. PA12203001_PX_EN_MASK, enable);
  117. if (ret < 0)
  118. return ret;
  119. data->px_enabled = !!enable;
  120. return 0;
  121. }
  122. static int pa12203001_set_power_state(struct pa12203001_data *data, bool on,
  123. u8 mask)
  124. {
  125. #ifdef CONFIG_PM
  126. int ret;
  127. if (on && (mask & PA12203001_ALS_EN_MASK)) {
  128. mutex_lock(&data->lock);
  129. if (data->px_enabled) {
  130. ret = pa12203001_als_enable(data,
  131. PA12203001_ALS_EN_MASK);
  132. if (ret < 0)
  133. goto err;
  134. } else {
  135. data->als_needs_enable = true;
  136. }
  137. mutex_unlock(&data->lock);
  138. }
  139. if (on && (mask & PA12203001_PX_EN_MASK)) {
  140. mutex_lock(&data->lock);
  141. if (data->als_enabled) {
  142. ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
  143. if (ret < 0)
  144. goto err;
  145. } else {
  146. data->px_needs_enable = true;
  147. }
  148. mutex_unlock(&data->lock);
  149. }
  150. if (on) {
  151. ret = pm_runtime_resume_and_get(&data->client->dev);
  152. } else {
  153. pm_runtime_mark_last_busy(&data->client->dev);
  154. ret = pm_runtime_put_autosuspend(&data->client->dev);
  155. }
  156. return ret;
  157. err:
  158. mutex_unlock(&data->lock);
  159. return ret;
  160. #endif
  161. return 0;
  162. }
  163. static int pa12203001_read_raw(struct iio_dev *indio_dev,
  164. struct iio_chan_spec const *chan, int *val,
  165. int *val2, long mask)
  166. {
  167. struct pa12203001_data *data = iio_priv(indio_dev);
  168. int ret;
  169. u8 dev_mask;
  170. unsigned int reg_byte;
  171. __le16 reg_word;
  172. switch (mask) {
  173. case IIO_CHAN_INFO_RAW:
  174. switch (chan->type) {
  175. case IIO_LIGHT:
  176. dev_mask = PA12203001_ALS_EN_MASK;
  177. ret = pa12203001_set_power_state(data, true, dev_mask);
  178. if (ret < 0)
  179. return ret;
  180. /*
  181. * ALS ADC value is stored in registers
  182. * PA12203001_REG_ADL and in PA12203001_REG_ADL + 1.
  183. */
  184. ret = regmap_bulk_read(data->map, PA12203001_REG_ADL,
  185. &reg_word, 2);
  186. if (ret < 0)
  187. goto reg_err;
  188. *val = le16_to_cpu(reg_word);
  189. ret = pa12203001_set_power_state(data, false, dev_mask);
  190. if (ret < 0)
  191. return ret;
  192. break;
  193. case IIO_PROXIMITY:
  194. dev_mask = PA12203001_PX_EN_MASK;
  195. ret = pa12203001_set_power_state(data, true, dev_mask);
  196. if (ret < 0)
  197. return ret;
  198. ret = regmap_read(data->map, PA12203001_REG_PDH,
  199. &reg_byte);
  200. if (ret < 0)
  201. goto reg_err;
  202. *val = reg_byte;
  203. ret = pa12203001_set_power_state(data, false, dev_mask);
  204. if (ret < 0)
  205. return ret;
  206. break;
  207. default:
  208. return -EINVAL;
  209. }
  210. return IIO_VAL_INT;
  211. case IIO_CHAN_INFO_SCALE:
  212. ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
  213. if (ret < 0)
  214. return ret;
  215. *val = 0;
  216. reg_byte = (reg_byte & PA12203001_AFSR_MASK);
  217. *val2 = pa12203001_scales[reg_byte >> 4];
  218. return IIO_VAL_INT_PLUS_MICRO;
  219. default:
  220. return -EINVAL;
  221. }
  222. reg_err:
  223. pa12203001_set_power_state(data, false, dev_mask);
  224. return ret;
  225. }
  226. static int pa12203001_write_raw(struct iio_dev *indio_dev,
  227. struct iio_chan_spec const *chan, int val,
  228. int val2, long mask)
  229. {
  230. struct pa12203001_data *data = iio_priv(indio_dev);
  231. int i, ret, new_val;
  232. unsigned int reg_byte;
  233. switch (mask) {
  234. case IIO_CHAN_INFO_SCALE:
  235. ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
  236. if (val != 0 || ret < 0)
  237. return -EINVAL;
  238. for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) {
  239. if (val2 == pa12203001_scales[i]) {
  240. new_val = i << PA12203001_AFSR_SHIFT;
  241. return regmap_update_bits(data->map,
  242. PA12203001_REG_CFG0,
  243. PA12203001_AFSR_MASK,
  244. new_val);
  245. }
  246. }
  247. break;
  248. default:
  249. break;
  250. }
  251. return -EINVAL;
  252. }
  253. static const struct iio_info pa12203001_info = {
  254. .read_raw = pa12203001_read_raw,
  255. .write_raw = pa12203001_write_raw,
  256. .attrs = &pa12203001_attr_group,
  257. };
  258. static int pa12203001_init(struct iio_dev *indio_dev)
  259. {
  260. struct pa12203001_data *data = iio_priv(indio_dev);
  261. int i, ret;
  262. for (i = 0; i < ARRAY_SIZE(regvals); i++) {
  263. ret = regmap_write(data->map, regvals[i].reg, regvals[i].val);
  264. if (ret < 0)
  265. return ret;
  266. }
  267. return 0;
  268. }
  269. static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state)
  270. {
  271. struct pa12203001_data *data = iio_priv(indio_dev);
  272. int ret;
  273. mutex_lock(&data->lock);
  274. ret = pa12203001_als_enable(data, state);
  275. if (ret < 0)
  276. goto out;
  277. ret = pa12203001_px_enable(data, state);
  278. out:
  279. mutex_unlock(&data->lock);
  280. return ret;
  281. }
  282. static int pa12203001_probe(struct i2c_client *client,
  283. const struct i2c_device_id *id)
  284. {
  285. struct pa12203001_data *data;
  286. struct iio_dev *indio_dev;
  287. int ret;
  288. indio_dev = devm_iio_device_alloc(&client->dev,
  289. sizeof(struct pa12203001_data));
  290. if (!indio_dev)
  291. return -ENOMEM;
  292. data = iio_priv(indio_dev);
  293. i2c_set_clientdata(client, indio_dev);
  294. data->client = client;
  295. data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config);
  296. if (IS_ERR(data->map))
  297. return PTR_ERR(data->map);
  298. mutex_init(&data->lock);
  299. indio_dev->info = &pa12203001_info;
  300. indio_dev->name = PA12203001_DRIVER_NAME;
  301. indio_dev->channels = pa12203001_channels;
  302. indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels);
  303. indio_dev->modes = INDIO_DIRECT_MODE;
  304. ret = pa12203001_init(indio_dev);
  305. if (ret < 0)
  306. return ret;
  307. ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
  308. if (ret < 0)
  309. return ret;
  310. ret = pm_runtime_set_active(&client->dev);
  311. if (ret < 0)
  312. goto out_err;
  313. pm_runtime_enable(&client->dev);
  314. pm_runtime_set_autosuspend_delay(&client->dev,
  315. PA12203001_SLEEP_DELAY_MS);
  316. pm_runtime_use_autosuspend(&client->dev);
  317. ret = iio_device_register(indio_dev);
  318. if (ret < 0)
  319. goto out_err;
  320. return 0;
  321. out_err:
  322. pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
  323. return ret;
  324. }
  325. static void pa12203001_remove(struct i2c_client *client)
  326. {
  327. struct iio_dev *indio_dev = i2c_get_clientdata(client);
  328. int ret;
  329. iio_device_unregister(indio_dev);
  330. pm_runtime_disable(&client->dev);
  331. pm_runtime_set_suspended(&client->dev);
  332. ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
  333. if (ret)
  334. dev_warn(&client->dev, "Failed to power down (%pe)\n",
  335. ERR_PTR(ret));
  336. }
  337. #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)
  338. static int pa12203001_suspend(struct device *dev)
  339. {
  340. struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
  341. return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
  342. }
  343. #endif
  344. #ifdef CONFIG_PM_SLEEP
  345. static int pa12203001_resume(struct device *dev)
  346. {
  347. struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
  348. return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
  349. }
  350. #endif
  351. #ifdef CONFIG_PM
  352. static int pa12203001_runtime_resume(struct device *dev)
  353. {
  354. struct pa12203001_data *data;
  355. data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
  356. mutex_lock(&data->lock);
  357. if (data->als_needs_enable) {
  358. pa12203001_als_enable(data, PA12203001_ALS_EN_MASK);
  359. data->als_needs_enable = false;
  360. }
  361. if (data->px_needs_enable) {
  362. pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
  363. data->px_needs_enable = false;
  364. }
  365. mutex_unlock(&data->lock);
  366. return 0;
  367. }
  368. #endif
  369. static const struct dev_pm_ops pa12203001_pm_ops = {
  370. SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume)
  371. SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL)
  372. };
  373. static const struct acpi_device_id pa12203001_acpi_match[] = {
  374. { "TXCPA122", 0 },
  375. {}
  376. };
  377. MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match);
  378. static const struct i2c_device_id pa12203001_id[] = {
  379. { "txcpa122", 0 },
  380. {}
  381. };
  382. MODULE_DEVICE_TABLE(i2c, pa12203001_id);
  383. static struct i2c_driver pa12203001_driver = {
  384. .driver = {
  385. .name = PA12203001_DRIVER_NAME,
  386. .pm = &pa12203001_pm_ops,
  387. .acpi_match_table = ACPI_PTR(pa12203001_acpi_match),
  388. },
  389. .probe = pa12203001_probe,
  390. .remove = pa12203001_remove,
  391. .id_table = pa12203001_id,
  392. };
  393. module_i2c_driver(pa12203001_driver);
  394. MODULE_AUTHOR("Adriana Reus <[email protected]>");
  395. MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor");
  396. MODULE_LICENSE("GPL v2");