sy8827n.c 4.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. //
  3. // SY8827N regulator driver
  4. //
  5. // Copyright (C) 2020 Synaptics Incorporated
  6. //
  7. // Author: Jisheng Zhang <jszhang@kernel.org>
  8. #include <linux/gpio/consumer.h>
  9. #include <linux/module.h>
  10. #include <linux/i2c.h>
  11. #include <linux/of_device.h>
  12. #include <linux/regmap.h>
  13. #include <linux/regulator/driver.h>
  14. #include <linux/regulator/of_regulator.h>
  15. #define SY8827N_VSEL0 0
  16. #define SY8827N_BUCK_EN (1 << 7)
  17. #define SY8827N_MODE (1 << 6)
  18. #define SY8827N_VSEL1 1
  19. #define SY8827N_CTRL 2
  20. #define SY8827N_NVOLTAGES 64
  21. #define SY8827N_VSELMIN 600000
  22. #define SY8827N_VSELSTEP 12500
  23. struct sy8827n_device_info {
  24. struct device *dev;
  25. struct regulator_desc desc;
  26. struct regulator_init_data *regulator;
  27. struct gpio_desc *en_gpio;
  28. unsigned int vsel_reg;
  29. };
  30. static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)
  31. {
  32. struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
  33. switch (mode) {
  34. case REGULATOR_MODE_FAST:
  35. regmap_update_bits(rdev->regmap, di->vsel_reg,
  36. SY8827N_MODE, SY8827N_MODE);
  37. break;
  38. case REGULATOR_MODE_NORMAL:
  39. regmap_update_bits(rdev->regmap, di->vsel_reg,
  40. SY8827N_MODE, 0);
  41. break;
  42. default:
  43. return -EINVAL;
  44. }
  45. return 0;
  46. }
  47. static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)
  48. {
  49. struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
  50. u32 val;
  51. int ret = 0;
  52. ret = regmap_read(rdev->regmap, di->vsel_reg, &val);
  53. if (ret < 0)
  54. return ret;
  55. if (val & SY8827N_MODE)
  56. return REGULATOR_MODE_FAST;
  57. else
  58. return REGULATOR_MODE_NORMAL;
  59. }
  60. static const struct regulator_ops sy8827n_regulator_ops = {
  61. .set_voltage_sel = regulator_set_voltage_sel_regmap,
  62. .get_voltage_sel = regulator_get_voltage_sel_regmap,
  63. .set_voltage_time_sel = regulator_set_voltage_time_sel,
  64. .map_voltage = regulator_map_voltage_linear,
  65. .list_voltage = regulator_list_voltage_linear,
  66. .enable = regulator_enable_regmap,
  67. .disable = regulator_disable_regmap,
  68. .is_enabled = regulator_is_enabled_regmap,
  69. .set_mode = sy8827n_set_mode,
  70. .get_mode = sy8827n_get_mode,
  71. };
  72. static int sy8827n_regulator_register(struct sy8827n_device_info *di,
  73. struct regulator_config *config)
  74. {
  75. struct regulator_desc *rdesc = &di->desc;
  76. struct regulator_dev *rdev;
  77. rdesc->name = "sy8827n-reg";
  78. rdesc->supply_name = "vin";
  79. rdesc->ops = &sy8827n_regulator_ops;
  80. rdesc->type = REGULATOR_VOLTAGE;
  81. rdesc->n_voltages = SY8827N_NVOLTAGES;
  82. rdesc->enable_reg = di->vsel_reg;
  83. rdesc->enable_mask = SY8827N_BUCK_EN;
  84. rdesc->min_uV = SY8827N_VSELMIN;
  85. rdesc->uV_step = SY8827N_VSELSTEP;
  86. rdesc->vsel_reg = di->vsel_reg;
  87. rdesc->vsel_mask = rdesc->n_voltages - 1;
  88. rdesc->owner = THIS_MODULE;
  89. rdev = devm_regulator_register(di->dev, &di->desc, config);
  90. return PTR_ERR_OR_ZERO(rdev);
  91. }
  92. static const struct regmap_config sy8827n_regmap_config = {
  93. .reg_bits = 8,
  94. .val_bits = 8,
  95. };
  96. static int sy8827n_i2c_probe(struct i2c_client *client)
  97. {
  98. struct device *dev = &client->dev;
  99. struct device_node *np = dev->of_node;
  100. struct sy8827n_device_info *di;
  101. struct regulator_config config = { };
  102. struct regmap *regmap;
  103. int ret;
  104. di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL);
  105. if (!di)
  106. return -ENOMEM;
  107. di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
  108. if (!di->regulator) {
  109. dev_err(dev, "Platform data not found!\n");
  110. return -EINVAL;
  111. }
  112. di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
  113. if (IS_ERR(di->en_gpio))
  114. return PTR_ERR(di->en_gpio);
  115. if (of_property_read_bool(np, "silergy,vsel-state-high"))
  116. di->vsel_reg = SY8827N_VSEL1;
  117. else
  118. di->vsel_reg = SY8827N_VSEL0;
  119. di->dev = dev;
  120. regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config);
  121. if (IS_ERR(regmap)) {
  122. dev_err(dev, "Failed to allocate regmap!\n");
  123. return PTR_ERR(regmap);
  124. }
  125. i2c_set_clientdata(client, di);
  126. config.dev = di->dev;
  127. config.init_data = di->regulator;
  128. config.regmap = regmap;
  129. config.driver_data = di;
  130. config.of_node = np;
  131. ret = sy8827n_regulator_register(di, &config);
  132. if (ret < 0)
  133. dev_err(dev, "Failed to register regulator!\n");
  134. return ret;
  135. }
  136. #ifdef CONFIG_OF
  137. static const struct of_device_id sy8827n_dt_ids[] = {
  138. {
  139. .compatible = "silergy,sy8827n",
  140. },
  141. { }
  142. };
  143. MODULE_DEVICE_TABLE(of, sy8827n_dt_ids);
  144. #endif
  145. static const struct i2c_device_id sy8827n_id[] = {
  146. { "sy8827n", },
  147. { },
  148. };
  149. MODULE_DEVICE_TABLE(i2c, sy8827n_id);
  150. static struct i2c_driver sy8827n_regulator_driver = {
  151. .driver = {
  152. .name = "sy8827n-regulator",
  153. .of_match_table = of_match_ptr(sy8827n_dt_ids),
  154. },
  155. .probe_new = sy8827n_i2c_probe,
  156. .id_table = sy8827n_id,
  157. };
  158. module_i2c_driver(sy8827n_regulator_driver);
  159. MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
  160. MODULE_DESCRIPTION("SY8827N regulator driver");
  161. MODULE_LICENSE("GPL v2");