da9210-regulator.c 6.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. //
  3. // da9210-regulator.c - Regulator device driver for DA9210
  4. // Copyright (C) 2013 Dialog Semiconductor Ltd.
  5. #include <linux/err.h>
  6. #include <linux/i2c.h>
  7. #include <linux/module.h>
  8. #include <linux/interrupt.h>
  9. #include <linux/irq.h>
  10. #include <linux/regulator/driver.h>
  11. #include <linux/regulator/machine.h>
  12. #include <linux/of_device.h>
  13. #include <linux/regulator/of_regulator.h>
  14. #include <linux/regmap.h>
  15. #include "da9210-regulator.h"
  16. struct da9210 {
  17. struct regulator_dev *rdev;
  18. struct regmap *regmap;
  19. };
  20. static const struct regmap_config da9210_regmap_config = {
  21. .reg_bits = 8,
  22. .val_bits = 8,
  23. };
  24. static const struct regulator_ops da9210_buck_ops = {
  25. .enable = regulator_enable_regmap,
  26. .disable = regulator_disable_regmap,
  27. .is_enabled = regulator_is_enabled_regmap,
  28. .set_voltage_sel = regulator_set_voltage_sel_regmap,
  29. .get_voltage_sel = regulator_get_voltage_sel_regmap,
  30. .list_voltage = regulator_list_voltage_linear,
  31. .set_current_limit = regulator_set_current_limit_regmap,
  32. .get_current_limit = regulator_get_current_limit_regmap,
  33. };
  34. /* Default limits measured in millivolts and milliamps */
  35. #define DA9210_MIN_MV 300
  36. #define DA9210_MAX_MV 1570
  37. #define DA9210_STEP_MV 10
  38. /* Current limits for buck (uA) indices corresponds with register values */
  39. static const unsigned int da9210_buck_limits[] = {
  40. 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
  41. 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
  42. };
  43. static const struct regulator_desc da9210_reg = {
  44. .name = "DA9210",
  45. .id = 0,
  46. .ops = &da9210_buck_ops,
  47. .type = REGULATOR_VOLTAGE,
  48. .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
  49. .min_uV = (DA9210_MIN_MV * 1000),
  50. .uV_step = (DA9210_STEP_MV * 1000),
  51. .vsel_reg = DA9210_REG_VBUCK_A,
  52. .vsel_mask = DA9210_VBUCK_MASK,
  53. .enable_reg = DA9210_REG_BUCK_CONT,
  54. .enable_mask = DA9210_BUCK_EN,
  55. .owner = THIS_MODULE,
  56. .curr_table = da9210_buck_limits,
  57. .n_current_limits = ARRAY_SIZE(da9210_buck_limits),
  58. .csel_reg = DA9210_REG_BUCK_ILIM,
  59. .csel_mask = DA9210_BUCK_ILIM_MASK,
  60. };
  61. static irqreturn_t da9210_irq_handler(int irq, void *data)
  62. {
  63. struct da9210 *chip = data;
  64. unsigned int val, handled = 0;
  65. int error, ret = IRQ_NONE;
  66. error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
  67. if (error < 0)
  68. goto error_i2c;
  69. if (val & DA9210_E_OVCURR) {
  70. regulator_notifier_call_chain(chip->rdev,
  71. REGULATOR_EVENT_OVER_CURRENT,
  72. NULL);
  73. handled |= DA9210_E_OVCURR;
  74. }
  75. if (val & DA9210_E_NPWRGOOD) {
  76. regulator_notifier_call_chain(chip->rdev,
  77. REGULATOR_EVENT_UNDER_VOLTAGE,
  78. NULL);
  79. handled |= DA9210_E_NPWRGOOD;
  80. }
  81. if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
  82. regulator_notifier_call_chain(chip->rdev,
  83. REGULATOR_EVENT_OVER_TEMP, NULL);
  84. handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
  85. }
  86. if (val & DA9210_E_VMAX) {
  87. regulator_notifier_call_chain(chip->rdev,
  88. REGULATOR_EVENT_REGULATION_OUT,
  89. NULL);
  90. handled |= DA9210_E_VMAX;
  91. }
  92. if (handled) {
  93. /* Clear handled events */
  94. error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
  95. if (error < 0)
  96. goto error_i2c;
  97. ret = IRQ_HANDLED;
  98. }
  99. return ret;
  100. error_i2c:
  101. dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
  102. return ret;
  103. }
  104. /*
  105. * I2C driver interface functions
  106. */
  107. static const struct of_device_id __maybe_unused da9210_dt_ids[] = {
  108. { .compatible = "dlg,da9210", },
  109. { }
  110. };
  111. MODULE_DEVICE_TABLE(of, da9210_dt_ids);
  112. static int da9210_i2c_probe(struct i2c_client *i2c)
  113. {
  114. struct da9210 *chip;
  115. struct device *dev = &i2c->dev;
  116. struct da9210_pdata *pdata = dev_get_platdata(dev);
  117. struct regulator_dev *rdev = NULL;
  118. struct regulator_config config = { };
  119. int error;
  120. const struct of_device_id *match;
  121. if (i2c->dev.of_node && !pdata) {
  122. match = of_match_device(of_match_ptr(da9210_dt_ids),
  123. &i2c->dev);
  124. if (!match) {
  125. dev_err(&i2c->dev, "Error: No device match found\n");
  126. return -ENODEV;
  127. }
  128. }
  129. chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
  130. if (!chip)
  131. return -ENOMEM;
  132. chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
  133. if (IS_ERR(chip->regmap)) {
  134. error = PTR_ERR(chip->regmap);
  135. dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
  136. error);
  137. return error;
  138. }
  139. config.dev = &i2c->dev;
  140. config.init_data = pdata ? &pdata->da9210_constraints :
  141. of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
  142. config.driver_data = chip;
  143. config.regmap = chip->regmap;
  144. config.of_node = dev->of_node;
  145. /* Mask all interrupt sources to deassert interrupt line */
  146. error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
  147. if (!error)
  148. error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
  149. if (error) {
  150. dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
  151. return error;
  152. }
  153. rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
  154. if (IS_ERR(rdev)) {
  155. dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
  156. return PTR_ERR(rdev);
  157. }
  158. chip->rdev = rdev;
  159. if (i2c->irq) {
  160. error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
  161. da9210_irq_handler,
  162. IRQF_TRIGGER_LOW |
  163. IRQF_ONESHOT | IRQF_SHARED,
  164. "da9210", chip);
  165. if (error) {
  166. dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
  167. i2c->irq, error);
  168. return error;
  169. }
  170. error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
  171. DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
  172. DA9210_M_TEMP_WARN |
  173. DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
  174. if (error < 0) {
  175. dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
  176. error);
  177. return error;
  178. }
  179. } else {
  180. dev_warn(&i2c->dev, "No IRQ configured\n");
  181. }
  182. i2c_set_clientdata(i2c, chip);
  183. return 0;
  184. }
  185. static const struct i2c_device_id da9210_i2c_id[] = {
  186. {"da9210", 0},
  187. {},
  188. };
  189. MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
  190. static struct i2c_driver da9210_regulator_driver = {
  191. .driver = {
  192. .name = "da9210",
  193. .of_match_table = of_match_ptr(da9210_dt_ids),
  194. },
  195. .probe_new = da9210_i2c_probe,
  196. .id_table = da9210_i2c_id,
  197. };
  198. module_i2c_driver(da9210_regulator_driver);
  199. MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
  200. MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
  201. MODULE_LICENSE("GPL v2");