max77826-regulator.c 7.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. //
  3. // max77826-regulator.c - regulator driver for Maxim MAX77826
  4. //
  5. // Author: Iskren Chernev <iskren.chernev@gmail.com>
  6. #include <linux/kernel.h>
  7. #include <linux/module.h>
  8. #include <linux/init.h>
  9. #include <linux/err.h>
  10. #include <linux/of.h>
  11. #include <linux/of_device.h>
  12. #include <linux/platform_device.h>
  13. #include <linux/regulator/driver.h>
  14. #include <linux/regulator/of_regulator.h>
  15. #include <linux/i2c.h>
  16. #include <linux/regmap.h>
  17. enum max77826_registers {
  18. MAX77826_REG_INT_SRC = 0x00,
  19. MAX77826_REG_SYS_INT,
  20. MAX77826_REG_INT1,
  21. MAX77826_REG_INT2,
  22. MAX77826_REG_BB_INT,
  23. MAX77826_REG_INT_SRC_M,
  24. MAX77826_REG_TOPSYS_INT_M,
  25. MAX77826_REG_INT1_M,
  26. MAX77826_REG_INT2_M,
  27. MAX77826_REG_BB_INT_M,
  28. MAX77826_REG_TOPSYS_STAT,
  29. MAX77826_REG_STAT1,
  30. MAX77826_REG_STAT2,
  31. MAX77826_REG_BB_STAT,
  32. /* 0x0E - 0x0F: Reserved */
  33. MAX77826_REG_LDO_OPMD1 = 0x10,
  34. MAX77826_REG_LDO_OPMD2,
  35. MAX77826_REG_LDO_OPMD3,
  36. MAX77826_REG_LDO_OPMD4,
  37. MAX77826_REG_B_BB_OPMD,
  38. /* 0x15 - 0x1F: Reserved */
  39. MAX77826_REG_LDO1_CFG = 0x20,
  40. MAX77826_REG_LDO2_CFG,
  41. MAX77826_REG_LDO3_CFG,
  42. MAX77826_REG_LDO4_CFG,
  43. MAX77826_REG_LDO5_CFG,
  44. MAX77826_REG_LDO6_CFG,
  45. MAX77826_REG_LDO7_CFG,
  46. MAX77826_REG_LDO8_CFG,
  47. MAX77826_REG_LDO9_CFG,
  48. MAX77826_REG_LDO10_CFG,
  49. MAX77826_REG_LDO11_CFG,
  50. MAX77826_REG_LDO12_CFG,
  51. MAX77826_REG_LDO13_CFG,
  52. MAX77826_REG_LDO14_CFG,
  53. MAX77826_REG_LDO15_CFG,
  54. /* 0x2F: Reserved */
  55. MAX77826_REG_BUCK_CFG = 0x30,
  56. MAX77826_REG_BUCK_VOUT,
  57. MAX77826_REG_BB_CFG,
  58. MAX77826_REG_BB_VOUT,
  59. /* 0x34 - 0x3F: Reserved */
  60. MAX77826_REG_BUCK_SS_FREQ = 0x40,
  61. MAX77826_REG_UVLO_FALL,
  62. /* 0x42 - 0xCE: Reserved */
  63. MAX77826_REG_DEVICE_ID = 0xCF,
  64. };
  65. enum max77826_regulators {
  66. MAX77826_LDO1 = 0,
  67. MAX77826_LDO2,
  68. MAX77826_LDO3,
  69. MAX77826_LDO4,
  70. MAX77826_LDO5,
  71. MAX77826_LDO6,
  72. MAX77826_LDO7,
  73. MAX77826_LDO8,
  74. MAX77826_LDO9,
  75. MAX77826_LDO10,
  76. MAX77826_LDO11,
  77. MAX77826_LDO12,
  78. MAX77826_LDO13,
  79. MAX77826_LDO14,
  80. MAX77826_LDO15,
  81. MAX77826_BUCK,
  82. MAX77826_BUCKBOOST,
  83. MAX77826_MAX_REGULATORS,
  84. };
  85. #define MAX77826_MASK_LDO 0x7f
  86. #define MAX77826_MASK_BUCK 0xff
  87. #define MAX77826_MASK_BUCKBOOST 0x7f
  88. #define MAX77826_BUCK_RAMP_DELAY 12500
  89. /* values in mV */
  90. /* for LDO1-3 */
  91. #define MAX77826_NMOS_LDO_VOLT_MIN 600000
  92. #define MAX77826_NMOS_LDO_VOLT_MAX 2187500
  93. #define MAX77826_NMOS_LDO_VOLT_STEP 12500
  94. /* for LDO4-15 */
  95. #define MAX77826_PMOS_LDO_VOLT_MIN 800000
  96. #define MAX77826_PMOS_LDO_VOLT_MAX 3975000
  97. #define MAX77826_PMOS_LDO_VOLT_STEP 25000
  98. /* for BUCK */
  99. #define MAX77826_BUCK_VOLT_MIN 500000
  100. #define MAX77826_BUCK_VOLT_MAX 1800000
  101. #define MAX77826_BUCK_VOLT_STEP 6250
  102. /* for BUCKBOOST */
  103. #define MAX77826_BUCKBOOST_VOLT_MIN 2600000
  104. #define MAX77826_BUCKBOOST_VOLT_MAX 4187500
  105. #define MAX77826_BUCKBOOST_VOLT_STEP 12500
  106. #define MAX77826_VOLT_RANGE(_type) \
  107. ((MAX77826_ ## _type ## _VOLT_MAX - \
  108. MAX77826_ ## _type ## _VOLT_MIN) / \
  109. MAX77826_ ## _type ## _VOLT_STEP + 1)
  110. #define MAX77826_LDO(_id, _type) \
  111. [MAX77826_LDO ## _id] = { \
  112. .id = MAX77826_LDO ## _id, \
  113. .name = "LDO"#_id, \
  114. .of_match = of_match_ptr("LDO"#_id), \
  115. .regulators_node = "regulators", \
  116. .ops = &max77826_most_ops, \
  117. .min_uV = MAX77826_ ## _type ## _LDO_VOLT_MIN, \
  118. .uV_step = MAX77826_ ## _type ## _LDO_VOLT_STEP, \
  119. .n_voltages = MAX77826_VOLT_RANGE(_type ## _LDO), \
  120. .enable_reg = MAX77826_REG_LDO_OPMD1 + (_id - 1) / 4, \
  121. .enable_mask = BIT(((_id - 1) % 4) * 2 + 1), \
  122. .vsel_reg = MAX77826_REG_LDO1_CFG + (_id - 1), \
  123. .vsel_mask = MAX77826_MASK_LDO, \
  124. .owner = THIS_MODULE, \
  125. }
  126. #define MAX77826_BUCK(_idx, _id, _ops) \
  127. [MAX77826_ ## _id] = { \
  128. .id = MAX77826_ ## _id, \
  129. .name = #_id, \
  130. .of_match = of_match_ptr(#_id), \
  131. .regulators_node = "regulators", \
  132. .ops = &_ops, \
  133. .min_uV = MAX77826_ ## _id ## _VOLT_MIN, \
  134. .uV_step = MAX77826_ ## _id ## _VOLT_STEP, \
  135. .n_voltages = MAX77826_VOLT_RANGE(_id), \
  136. .enable_reg = MAX77826_REG_B_BB_OPMD, \
  137. .enable_mask = BIT(_idx * 2 + 1), \
  138. .vsel_reg = MAX77826_REG_BUCK_VOUT + _idx * 2, \
  139. .vsel_mask = MAX77826_MASK_ ## _id, \
  140. .owner = THIS_MODULE, \
  141. }
  142. struct max77826_regulator_info {
  143. struct regmap *regmap;
  144. struct regulator_desc *rdesc;
  145. };
  146. static const struct regmap_config max77826_regmap_config = {
  147. .reg_bits = 8,
  148. .val_bits = 8,
  149. .max_register = MAX77826_REG_DEVICE_ID,
  150. };
  151. static int max77826_set_voltage_time_sel(struct regulator_dev *,
  152. unsigned int old_selector,
  153. unsigned int new_selector);
  154. static const struct regulator_ops max77826_most_ops = {
  155. .enable = regulator_enable_regmap,
  156. .disable = regulator_disable_regmap,
  157. .is_enabled = regulator_is_enabled_regmap,
  158. .list_voltage = regulator_list_voltage_linear,
  159. .map_voltage = regulator_map_voltage_linear,
  160. .get_voltage_sel = regulator_get_voltage_sel_regmap,
  161. .set_voltage_sel = regulator_set_voltage_sel_regmap,
  162. };
  163. static const struct regulator_ops max77826_buck_ops = {
  164. .enable = regulator_enable_regmap,
  165. .disable = regulator_disable_regmap,
  166. .is_enabled = regulator_is_enabled_regmap,
  167. .list_voltage = regulator_list_voltage_linear,
  168. .map_voltage = regulator_map_voltage_linear,
  169. .get_voltage_sel = regulator_get_voltage_sel_regmap,
  170. .set_voltage_sel = regulator_set_voltage_sel_regmap,
  171. .set_voltage_time_sel = max77826_set_voltage_time_sel,
  172. };
  173. static struct regulator_desc max77826_regulators_desc[] = {
  174. MAX77826_LDO(1, NMOS),
  175. MAX77826_LDO(2, NMOS),
  176. MAX77826_LDO(3, NMOS),
  177. MAX77826_LDO(4, PMOS),
  178. MAX77826_LDO(5, PMOS),
  179. MAX77826_LDO(6, PMOS),
  180. MAX77826_LDO(7, PMOS),
  181. MAX77826_LDO(8, PMOS),
  182. MAX77826_LDO(9, PMOS),
  183. MAX77826_LDO(10, PMOS),
  184. MAX77826_LDO(11, PMOS),
  185. MAX77826_LDO(12, PMOS),
  186. MAX77826_LDO(13, PMOS),
  187. MAX77826_LDO(14, PMOS),
  188. MAX77826_LDO(15, PMOS),
  189. MAX77826_BUCK(0, BUCK, max77826_buck_ops),
  190. MAX77826_BUCK(1, BUCKBOOST, max77826_most_ops),
  191. };
  192. static int max77826_set_voltage_time_sel(struct regulator_dev *rdev,
  193. unsigned int old_selector,
  194. unsigned int new_selector)
  195. {
  196. if (new_selector > old_selector) {
  197. return DIV_ROUND_UP(MAX77826_BUCK_VOLT_STEP *
  198. (new_selector - old_selector),
  199. MAX77826_BUCK_RAMP_DELAY);
  200. }
  201. return 0;
  202. }
  203. static int max77826_read_device_id(struct regmap *regmap, struct device *dev)
  204. {
  205. unsigned int device_id;
  206. int res;
  207. res = regmap_read(regmap, MAX77826_REG_DEVICE_ID, &device_id);
  208. if (!res)
  209. dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id);
  210. return res;
  211. }
  212. static int max77826_i2c_probe(struct i2c_client *client)
  213. {
  214. struct device *dev = &client->dev;
  215. struct max77826_regulator_info *info;
  216. struct regulator_config config = {};
  217. struct regulator_dev *rdev;
  218. struct regmap *regmap;
  219. int i;
  220. info = devm_kzalloc(dev, sizeof(struct max77826_regulator_info),
  221. GFP_KERNEL);
  222. if (!info)
  223. return -ENOMEM;
  224. info->rdesc = max77826_regulators_desc;
  225. regmap = devm_regmap_init_i2c(client, &max77826_regmap_config);
  226. if (IS_ERR(regmap)) {
  227. dev_err(dev, "Failed to allocate regmap!\n");
  228. return PTR_ERR(regmap);
  229. }
  230. info->regmap = regmap;
  231. i2c_set_clientdata(client, info);
  232. config.dev = dev;
  233. config.regmap = regmap;
  234. config.driver_data = info;
  235. for (i = 0; i < MAX77826_MAX_REGULATORS; i++) {
  236. rdev = devm_regulator_register(dev,
  237. &max77826_regulators_desc[i],
  238. &config);
  239. if (IS_ERR(rdev)) {
  240. dev_err(dev, "Failed to register regulator!\n");
  241. return PTR_ERR(rdev);
  242. }
  243. }
  244. return max77826_read_device_id(regmap, dev);
  245. }
  246. static const struct of_device_id __maybe_unused max77826_of_match[] = {
  247. { .compatible = "maxim,max77826" },
  248. { /* sentinel */ }
  249. };
  250. MODULE_DEVICE_TABLE(of, max77826_of_match);
  251. static const struct i2c_device_id max77826_id[] = {
  252. { "max77826-regulator" },
  253. { /* sentinel */ }
  254. };
  255. MODULE_DEVICE_TABLE(i2c, max77826_id);
  256. static struct i2c_driver max77826_regulator_driver = {
  257. .driver = {
  258. .name = "max77826",
  259. .of_match_table = of_match_ptr(max77826_of_match),
  260. },
  261. .probe_new = max77826_i2c_probe,
  262. .id_table = max77826_id,
  263. };
  264. module_i2c_driver(max77826_regulator_driver);
  265. MODULE_AUTHOR("Iskren Chernev <iskren.chernev@gmail.com>");
  266. MODULE_DESCRIPTION("MAX77826 PMIC regulator driver");
  267. MODULE_LICENSE("GPL");