max8998.c 8.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. //
  3. // max8998.c - mfd core driver for the Maxim 8998
  4. //
  5. // Copyright (C) 2009-2010 Samsung Electronics
  6. // Kyungmin Park <[email protected]>
  7. // Marek Szyprowski <[email protected]>
  8. #include <linux/err.h>
  9. #include <linux/init.h>
  10. #include <linux/slab.h>
  11. #include <linux/i2c.h>
  12. #include <linux/interrupt.h>
  13. #include <linux/of.h>
  14. #include <linux/of_device.h>
  15. #include <linux/of_irq.h>
  16. #include <linux/pm_runtime.h>
  17. #include <linux/mutex.h>
  18. #include <linux/mfd/core.h>
  19. #include <linux/mfd/max8998.h>
  20. #include <linux/mfd/max8998-private.h>
  21. #define RTC_I2C_ADDR (0x0c >> 1)
  22. static const struct mfd_cell max8998_devs[] = {
  23. {
  24. .name = "max8998-pmic",
  25. }, {
  26. .name = "max8998-rtc",
  27. }, {
  28. .name = "max8998-battery",
  29. },
  30. };
  31. static const struct mfd_cell lp3974_devs[] = {
  32. {
  33. .name = "lp3974-pmic",
  34. }, {
  35. .name = "lp3974-rtc",
  36. },
  37. };
  38. int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
  39. {
  40. struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  41. int ret;
  42. mutex_lock(&max8998->iolock);
  43. ret = i2c_smbus_read_byte_data(i2c, reg);
  44. mutex_unlock(&max8998->iolock);
  45. if (ret < 0)
  46. return ret;
  47. ret &= 0xff;
  48. *dest = ret;
  49. return 0;
  50. }
  51. EXPORT_SYMBOL(max8998_read_reg);
  52. int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  53. {
  54. struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  55. int ret;
  56. mutex_lock(&max8998->iolock);
  57. ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
  58. mutex_unlock(&max8998->iolock);
  59. if (ret < 0)
  60. return ret;
  61. return 0;
  62. }
  63. EXPORT_SYMBOL(max8998_bulk_read);
  64. int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
  65. {
  66. struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  67. int ret;
  68. mutex_lock(&max8998->iolock);
  69. ret = i2c_smbus_write_byte_data(i2c, reg, value);
  70. mutex_unlock(&max8998->iolock);
  71. return ret;
  72. }
  73. EXPORT_SYMBOL(max8998_write_reg);
  74. int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  75. {
  76. struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  77. int ret;
  78. mutex_lock(&max8998->iolock);
  79. ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
  80. mutex_unlock(&max8998->iolock);
  81. if (ret < 0)
  82. return ret;
  83. return 0;
  84. }
  85. EXPORT_SYMBOL(max8998_bulk_write);
  86. int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
  87. {
  88. struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  89. int ret;
  90. mutex_lock(&max8998->iolock);
  91. ret = i2c_smbus_read_byte_data(i2c, reg);
  92. if (ret >= 0) {
  93. u8 old_val = ret & 0xff;
  94. u8 new_val = (val & mask) | (old_val & (~mask));
  95. ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
  96. }
  97. mutex_unlock(&max8998->iolock);
  98. return ret;
  99. }
  100. EXPORT_SYMBOL(max8998_update_reg);
  101. #ifdef CONFIG_OF
  102. static const struct of_device_id max8998_dt_match[] = {
  103. { .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
  104. { .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
  105. { .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
  106. {},
  107. };
  108. #endif
  109. /*
  110. * Only the common platform data elements for max8998 are parsed here from the
  111. * device tree. Other sub-modules of max8998 such as pmic, rtc and others have
  112. * to parse their own platform data elements from device tree.
  113. *
  114. * The max8998 platform data structure is instantiated here and the drivers for
  115. * the sub-modules need not instantiate another instance while parsing their
  116. * platform data.
  117. */
  118. static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
  119. struct device *dev)
  120. {
  121. struct max8998_platform_data *pd;
  122. pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
  123. if (!pd)
  124. return ERR_PTR(-ENOMEM);
  125. pd->ono = irq_of_parse_and_map(dev->of_node, 1);
  126. /*
  127. * ToDo: the 'wakeup' member in the platform data is more of a linux
  128. * specfic information. Hence, there is no binding for that yet and
  129. * not parsed here.
  130. */
  131. return pd;
  132. }
  133. static inline unsigned long max8998_i2c_get_driver_data(struct i2c_client *i2c,
  134. const struct i2c_device_id *id)
  135. {
  136. if (i2c->dev.of_node)
  137. return (unsigned long)of_device_get_match_data(&i2c->dev);
  138. return id->driver_data;
  139. }
  140. static int max8998_i2c_probe(struct i2c_client *i2c,
  141. const struct i2c_device_id *id)
  142. {
  143. struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
  144. struct max8998_dev *max8998;
  145. int ret = 0;
  146. max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
  147. GFP_KERNEL);
  148. if (max8998 == NULL)
  149. return -ENOMEM;
  150. if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
  151. pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
  152. if (IS_ERR(pdata))
  153. return PTR_ERR(pdata);
  154. }
  155. i2c_set_clientdata(i2c, max8998);
  156. max8998->dev = &i2c->dev;
  157. max8998->i2c = i2c;
  158. max8998->irq = i2c->irq;
  159. max8998->type = max8998_i2c_get_driver_data(i2c, id);
  160. max8998->pdata = pdata;
  161. if (pdata) {
  162. max8998->ono = pdata->ono;
  163. max8998->irq_base = pdata->irq_base;
  164. max8998->wakeup = pdata->wakeup;
  165. }
  166. mutex_init(&max8998->iolock);
  167. max8998->rtc = i2c_new_dummy_device(i2c->adapter, RTC_I2C_ADDR);
  168. if (IS_ERR(max8998->rtc)) {
  169. dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
  170. return PTR_ERR(max8998->rtc);
  171. }
  172. i2c_set_clientdata(max8998->rtc, max8998);
  173. max8998_irq_init(max8998);
  174. pm_runtime_set_active(max8998->dev);
  175. switch (max8998->type) {
  176. case TYPE_LP3974:
  177. ret = mfd_add_devices(max8998->dev, -1,
  178. lp3974_devs, ARRAY_SIZE(lp3974_devs),
  179. NULL, 0, NULL);
  180. break;
  181. case TYPE_MAX8998:
  182. ret = mfd_add_devices(max8998->dev, -1,
  183. max8998_devs, ARRAY_SIZE(max8998_devs),
  184. NULL, 0, NULL);
  185. break;
  186. default:
  187. ret = -EINVAL;
  188. }
  189. if (ret < 0)
  190. goto err;
  191. device_init_wakeup(max8998->dev, max8998->wakeup);
  192. return ret;
  193. err:
  194. mfd_remove_devices(max8998->dev);
  195. max8998_irq_exit(max8998);
  196. i2c_unregister_device(max8998->rtc);
  197. return ret;
  198. }
  199. static const struct i2c_device_id max8998_i2c_id[] = {
  200. { "max8998", TYPE_MAX8998 },
  201. { "lp3974", TYPE_LP3974},
  202. { }
  203. };
  204. static int max8998_suspend(struct device *dev)
  205. {
  206. struct i2c_client *i2c = to_i2c_client(dev);
  207. struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  208. if (device_may_wakeup(dev))
  209. irq_set_irq_wake(max8998->irq, 1);
  210. return 0;
  211. }
  212. static int max8998_resume(struct device *dev)
  213. {
  214. struct i2c_client *i2c = to_i2c_client(dev);
  215. struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  216. if (device_may_wakeup(dev))
  217. irq_set_irq_wake(max8998->irq, 0);
  218. /*
  219. * In LP3974, if IRQ registers are not "read & clear"
  220. * when it's set during sleep, the interrupt becomes
  221. * disabled.
  222. */
  223. return max8998_irq_resume(i2c_get_clientdata(i2c));
  224. }
  225. struct max8998_reg_dump {
  226. u8 addr;
  227. u8 val;
  228. };
  229. #define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
  230. static struct max8998_reg_dump max8998_dump[] = {
  231. SAVE_ITEM(MAX8998_REG_IRQM1),
  232. SAVE_ITEM(MAX8998_REG_IRQM2),
  233. SAVE_ITEM(MAX8998_REG_IRQM3),
  234. SAVE_ITEM(MAX8998_REG_IRQM4),
  235. SAVE_ITEM(MAX8998_REG_STATUSM1),
  236. SAVE_ITEM(MAX8998_REG_STATUSM2),
  237. SAVE_ITEM(MAX8998_REG_CHGR1),
  238. SAVE_ITEM(MAX8998_REG_CHGR2),
  239. SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
  240. SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
  241. SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
  242. SAVE_ITEM(MAX8998_REG_ONOFF1),
  243. SAVE_ITEM(MAX8998_REG_ONOFF2),
  244. SAVE_ITEM(MAX8998_REG_ONOFF3),
  245. SAVE_ITEM(MAX8998_REG_ONOFF4),
  246. SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
  247. SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
  248. SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
  249. SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
  250. SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
  251. SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
  252. SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
  253. SAVE_ITEM(MAX8998_REG_LDO4),
  254. SAVE_ITEM(MAX8998_REG_LDO5),
  255. SAVE_ITEM(MAX8998_REG_LDO6),
  256. SAVE_ITEM(MAX8998_REG_LDO7),
  257. SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
  258. SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
  259. SAVE_ITEM(MAX8998_REG_LDO12),
  260. SAVE_ITEM(MAX8998_REG_LDO13),
  261. SAVE_ITEM(MAX8998_REG_LDO14),
  262. SAVE_ITEM(MAX8998_REG_LDO15),
  263. SAVE_ITEM(MAX8998_REG_LDO16),
  264. SAVE_ITEM(MAX8998_REG_LDO17),
  265. SAVE_ITEM(MAX8998_REG_BKCHR),
  266. SAVE_ITEM(MAX8998_REG_LBCNFG1),
  267. SAVE_ITEM(MAX8998_REG_LBCNFG2),
  268. };
  269. /* Save registers before hibernation */
  270. static int max8998_freeze(struct device *dev)
  271. {
  272. struct i2c_client *i2c = to_i2c_client(dev);
  273. int i;
  274. for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
  275. max8998_read_reg(i2c, max8998_dump[i].addr,
  276. &max8998_dump[i].val);
  277. return 0;
  278. }
  279. /* Restore registers after hibernation */
  280. static int max8998_restore(struct device *dev)
  281. {
  282. struct i2c_client *i2c = to_i2c_client(dev);
  283. int i;
  284. for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
  285. max8998_write_reg(i2c, max8998_dump[i].addr,
  286. max8998_dump[i].val);
  287. return 0;
  288. }
  289. static const struct dev_pm_ops max8998_pm = {
  290. .suspend = max8998_suspend,
  291. .resume = max8998_resume,
  292. .freeze = max8998_freeze,
  293. .restore = max8998_restore,
  294. };
  295. static struct i2c_driver max8998_i2c_driver = {
  296. .driver = {
  297. .name = "max8998",
  298. .pm = &max8998_pm,
  299. .suppress_bind_attrs = true,
  300. .of_match_table = of_match_ptr(max8998_dt_match),
  301. },
  302. .probe = max8998_i2c_probe,
  303. .id_table = max8998_i2c_id,
  304. };
  305. static int __init max8998_i2c_init(void)
  306. {
  307. return i2c_add_driver(&max8998_i2c_driver);
  308. }
  309. /* init early so consumer devices can complete system boot */
  310. subsys_initcall(max8998_i2c_init);