max8907.c 8.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * max8907.c - mfd driver for MAX8907
  4. *
  5. * Copyright (C) 2010 Gyungoh Yoo <[email protected]>
  6. * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
  7. */
  8. #include <linux/err.h>
  9. #include <linux/i2c.h>
  10. #include <linux/init.h>
  11. #include <linux/interrupt.h>
  12. #include <linux/irq.h>
  13. #include <linux/mfd/core.h>
  14. #include <linux/mfd/max8907.h>
  15. #include <linux/module.h>
  16. #include <linux/of.h>
  17. #include <linux/of_device.h>
  18. #include <linux/regmap.h>
  19. #include <linux/slab.h>
  20. static const struct mfd_cell max8907_cells[] = {
  21. { .name = "max8907-regulator", },
  22. { .name = "max8907-rtc", },
  23. };
  24. static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg)
  25. {
  26. switch (reg) {
  27. case MAX8907_REG_ON_OFF_IRQ1:
  28. case MAX8907_REG_ON_OFF_STAT:
  29. case MAX8907_REG_ON_OFF_IRQ2:
  30. case MAX8907_REG_CHG_IRQ1:
  31. case MAX8907_REG_CHG_IRQ2:
  32. case MAX8907_REG_CHG_STAT:
  33. return true;
  34. default:
  35. return false;
  36. }
  37. }
  38. static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg)
  39. {
  40. switch (reg) {
  41. case MAX8907_REG_ON_OFF_IRQ1:
  42. case MAX8907_REG_ON_OFF_IRQ2:
  43. case MAX8907_REG_CHG_IRQ1:
  44. case MAX8907_REG_CHG_IRQ2:
  45. return true;
  46. default:
  47. return false;
  48. }
  49. }
  50. static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
  51. {
  52. return !max8907_gen_is_volatile_reg(dev, reg);
  53. }
  54. static const struct regmap_config max8907_regmap_gen_config = {
  55. .reg_bits = 8,
  56. .val_bits = 8,
  57. .volatile_reg = max8907_gen_is_volatile_reg,
  58. .precious_reg = max8907_gen_is_precious_reg,
  59. .writeable_reg = max8907_gen_is_writeable_reg,
  60. .max_register = MAX8907_REG_LDO20VOUT,
  61. .cache_type = REGCACHE_RBTREE,
  62. };
  63. static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
  64. {
  65. if (reg <= MAX8907_REG_RTC_YEAR2)
  66. return true;
  67. switch (reg) {
  68. case MAX8907_REG_RTC_STATUS:
  69. case MAX8907_REG_RTC_IRQ:
  70. return true;
  71. default:
  72. return false;
  73. }
  74. }
  75. static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg)
  76. {
  77. switch (reg) {
  78. case MAX8907_REG_RTC_IRQ:
  79. return true;
  80. default:
  81. return false;
  82. }
  83. }
  84. static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg)
  85. {
  86. switch (reg) {
  87. case MAX8907_REG_RTC_STATUS:
  88. case MAX8907_REG_RTC_IRQ:
  89. return false;
  90. default:
  91. return true;
  92. }
  93. }
  94. static const struct regmap_config max8907_regmap_rtc_config = {
  95. .reg_bits = 8,
  96. .val_bits = 8,
  97. .volatile_reg = max8907_rtc_is_volatile_reg,
  98. .precious_reg = max8907_rtc_is_precious_reg,
  99. .writeable_reg = max8907_rtc_is_writeable_reg,
  100. .max_register = MAX8907_REG_MPL_CNTL,
  101. .cache_type = REGCACHE_RBTREE,
  102. };
  103. static const struct regmap_irq max8907_chg_irqs[] = {
  104. { .reg_offset = 0, .mask = 1 << 0, },
  105. { .reg_offset = 0, .mask = 1 << 1, },
  106. { .reg_offset = 0, .mask = 1 << 2, },
  107. { .reg_offset = 1, .mask = 1 << 0, },
  108. { .reg_offset = 1, .mask = 1 << 1, },
  109. { .reg_offset = 1, .mask = 1 << 2, },
  110. { .reg_offset = 1, .mask = 1 << 3, },
  111. { .reg_offset = 1, .mask = 1 << 4, },
  112. { .reg_offset = 1, .mask = 1 << 5, },
  113. { .reg_offset = 1, .mask = 1 << 6, },
  114. { .reg_offset = 1, .mask = 1 << 7, },
  115. };
  116. static const struct regmap_irq_chip max8907_chg_irq_chip = {
  117. .name = "max8907 chg",
  118. .status_base = MAX8907_REG_CHG_IRQ1,
  119. .mask_base = MAX8907_REG_CHG_IRQ1_MASK,
  120. .wake_base = MAX8907_REG_CHG_IRQ1_MASK,
  121. .irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1,
  122. .num_regs = 2,
  123. .irqs = max8907_chg_irqs,
  124. .num_irqs = ARRAY_SIZE(max8907_chg_irqs),
  125. };
  126. static const struct regmap_irq max8907_on_off_irqs[] = {
  127. { .reg_offset = 0, .mask = 1 << 0, },
  128. { .reg_offset = 0, .mask = 1 << 1, },
  129. { .reg_offset = 0, .mask = 1 << 2, },
  130. { .reg_offset = 0, .mask = 1 << 3, },
  131. { .reg_offset = 0, .mask = 1 << 4, },
  132. { .reg_offset = 0, .mask = 1 << 5, },
  133. { .reg_offset = 0, .mask = 1 << 6, },
  134. { .reg_offset = 0, .mask = 1 << 7, },
  135. { .reg_offset = 1, .mask = 1 << 0, },
  136. { .reg_offset = 1, .mask = 1 << 1, },
  137. };
  138. static const struct regmap_irq_chip max8907_on_off_irq_chip = {
  139. .name = "max8907 on_off",
  140. .status_base = MAX8907_REG_ON_OFF_IRQ1,
  141. .mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK,
  142. .irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1,
  143. .num_regs = 2,
  144. .irqs = max8907_on_off_irqs,
  145. .num_irqs = ARRAY_SIZE(max8907_on_off_irqs),
  146. };
  147. static const struct regmap_irq max8907_rtc_irqs[] = {
  148. { .reg_offset = 0, .mask = 1 << 2, },
  149. { .reg_offset = 0, .mask = 1 << 3, },
  150. };
  151. static const struct regmap_irq_chip max8907_rtc_irq_chip = {
  152. .name = "max8907 rtc",
  153. .status_base = MAX8907_REG_RTC_IRQ,
  154. .mask_base = MAX8907_REG_RTC_IRQ_MASK,
  155. .num_regs = 1,
  156. .irqs = max8907_rtc_irqs,
  157. .num_irqs = ARRAY_SIZE(max8907_rtc_irqs),
  158. };
  159. static struct max8907 *max8907_pm_off;
  160. static void max8907_power_off(void)
  161. {
  162. regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,
  163. MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);
  164. }
  165. static int max8907_i2c_probe(struct i2c_client *i2c,
  166. const struct i2c_device_id *id)
  167. {
  168. struct max8907 *max8907;
  169. int ret;
  170. struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);
  171. bool pm_off = false;
  172. if (pdata)
  173. pm_off = pdata->pm_off;
  174. else if (i2c->dev.of_node)
  175. pm_off = of_property_read_bool(i2c->dev.of_node,
  176. "maxim,system-power-controller");
  177. max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);
  178. if (!max8907) {
  179. ret = -ENOMEM;
  180. goto err_alloc_drvdata;
  181. }
  182. max8907->dev = &i2c->dev;
  183. dev_set_drvdata(max8907->dev, max8907);
  184. max8907->i2c_gen = i2c;
  185. i2c_set_clientdata(i2c, max8907);
  186. max8907->regmap_gen = devm_regmap_init_i2c(i2c,
  187. &max8907_regmap_gen_config);
  188. if (IS_ERR(max8907->regmap_gen)) {
  189. ret = PTR_ERR(max8907->regmap_gen);
  190. dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret);
  191. goto err_regmap_gen;
  192. }
  193. max8907->i2c_rtc = i2c_new_dummy_device(i2c->adapter, MAX8907_RTC_I2C_ADDR);
  194. if (IS_ERR(max8907->i2c_rtc)) {
  195. ret = PTR_ERR(max8907->i2c_rtc);
  196. goto err_dummy_rtc;
  197. }
  198. i2c_set_clientdata(max8907->i2c_rtc, max8907);
  199. max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc,
  200. &max8907_regmap_rtc_config);
  201. if (IS_ERR(max8907->regmap_rtc)) {
  202. ret = PTR_ERR(max8907->regmap_rtc);
  203. dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret);
  204. goto err_regmap_rtc;
  205. }
  206. ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
  207. IRQF_ONESHOT | IRQF_SHARED,
  208. -1, &max8907_chg_irq_chip,
  209. &max8907->irqc_chg);
  210. if (ret != 0) {
  211. dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);
  212. goto err_irqc_chg;
  213. }
  214. ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
  215. IRQF_ONESHOT | IRQF_SHARED, -1,
  216. &max8907_on_off_irq_chip,
  217. &max8907->irqc_on_off);
  218. if (ret != 0) {
  219. dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);
  220. goto err_irqc_on_off;
  221. }
  222. ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,
  223. IRQF_ONESHOT | IRQF_SHARED, -1,
  224. &max8907_rtc_irq_chip,
  225. &max8907->irqc_rtc);
  226. if (ret != 0) {
  227. dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);
  228. goto err_irqc_rtc;
  229. }
  230. ret = mfd_add_devices(max8907->dev, -1, max8907_cells,
  231. ARRAY_SIZE(max8907_cells), NULL, 0, NULL);
  232. if (ret != 0) {
  233. dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);
  234. goto err_add_devices;
  235. }
  236. if (pm_off && !pm_power_off) {
  237. max8907_pm_off = max8907;
  238. pm_power_off = max8907_power_off;
  239. }
  240. return 0;
  241. err_add_devices:
  242. regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
  243. err_irqc_rtc:
  244. regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
  245. err_irqc_on_off:
  246. regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
  247. err_irqc_chg:
  248. err_regmap_rtc:
  249. i2c_unregister_device(max8907->i2c_rtc);
  250. err_dummy_rtc:
  251. err_regmap_gen:
  252. err_alloc_drvdata:
  253. return ret;
  254. }
  255. static void max8907_i2c_remove(struct i2c_client *i2c)
  256. {
  257. struct max8907 *max8907 = i2c_get_clientdata(i2c);
  258. mfd_remove_devices(max8907->dev);
  259. regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
  260. regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
  261. regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
  262. i2c_unregister_device(max8907->i2c_rtc);
  263. }
  264. #ifdef CONFIG_OF
  265. static const struct of_device_id max8907_of_match[] = {
  266. { .compatible = "maxim,max8907" },
  267. { },
  268. };
  269. MODULE_DEVICE_TABLE(of, max8907_of_match);
  270. #endif
  271. static const struct i2c_device_id max8907_i2c_id[] = {
  272. {"max8907", 0},
  273. {}
  274. };
  275. MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
  276. static struct i2c_driver max8907_i2c_driver = {
  277. .driver = {
  278. .name = "max8907",
  279. .of_match_table = of_match_ptr(max8907_of_match),
  280. },
  281. .probe = max8907_i2c_probe,
  282. .remove = max8907_i2c_remove,
  283. .id_table = max8907_i2c_id,
  284. };
  285. static int __init max8907_i2c_init(void)
  286. {
  287. int ret = -ENODEV;
  288. ret = i2c_add_driver(&max8907_i2c_driver);
  289. if (ret != 0)
  290. pr_err("Failed to register I2C driver: %d\n", ret);
  291. return ret;
  292. }
  293. subsys_initcall(max8907_i2c_init);
  294. static void __exit max8907_i2c_exit(void)
  295. {
  296. i2c_del_driver(&max8907_i2c_driver);
  297. }
  298. module_exit(max8907_i2c_exit);
  299. MODULE_DESCRIPTION("MAX8907 multi-function core driver");
  300. MODULE_AUTHOR("Gyungoh Yoo <[email protected]>");
  301. MODULE_LICENSE("GPL v2");