wm831x-isink.c 5.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. //
  3. // wm831x-isink.c -- Current sink driver for the WM831x series
  4. //
  5. // Copyright 2009 Wolfson Microelectronics PLC.
  6. //
  7. // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  8. #include <linux/module.h>
  9. #include <linux/moduleparam.h>
  10. #include <linux/init.h>
  11. #include <linux/bitops.h>
  12. #include <linux/err.h>
  13. #include <linux/i2c.h>
  14. #include <linux/platform_device.h>
  15. #include <linux/regulator/driver.h>
  16. #include <linux/slab.h>
  17. #include <linux/mfd/wm831x/core.h>
  18. #include <linux/mfd/wm831x/regulator.h>
  19. #include <linux/mfd/wm831x/pdata.h>
  20. #define WM831X_ISINK_MAX_NAME 7
  21. struct wm831x_isink {
  22. char name[WM831X_ISINK_MAX_NAME];
  23. struct regulator_desc desc;
  24. int reg;
  25. struct wm831x *wm831x;
  26. struct regulator_dev *regulator;
  27. };
  28. static int wm831x_isink_enable(struct regulator_dev *rdev)
  29. {
  30. struct wm831x_isink *isink = rdev_get_drvdata(rdev);
  31. struct wm831x *wm831x = isink->wm831x;
  32. int ret;
  33. /* We have a two stage enable: first start the ISINK... */
  34. ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,
  35. WM831X_CS1_ENA);
  36. if (ret != 0)
  37. return ret;
  38. /* ...then enable drive */
  39. ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE,
  40. WM831X_CS1_DRIVE);
  41. if (ret != 0)
  42. wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
  43. return ret;
  44. }
  45. static int wm831x_isink_disable(struct regulator_dev *rdev)
  46. {
  47. struct wm831x_isink *isink = rdev_get_drvdata(rdev);
  48. struct wm831x *wm831x = isink->wm831x;
  49. int ret;
  50. ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0);
  51. if (ret < 0)
  52. return ret;
  53. ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
  54. if (ret < 0)
  55. return ret;
  56. return ret;
  57. }
  58. static int wm831x_isink_is_enabled(struct regulator_dev *rdev)
  59. {
  60. struct wm831x_isink *isink = rdev_get_drvdata(rdev);
  61. struct wm831x *wm831x = isink->wm831x;
  62. int ret;
  63. ret = wm831x_reg_read(wm831x, isink->reg);
  64. if (ret < 0)
  65. return ret;
  66. if ((ret & (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) ==
  67. (WM831X_CS1_ENA | WM831X_CS1_DRIVE))
  68. return 1;
  69. else
  70. return 0;
  71. }
  72. static const struct regulator_ops wm831x_isink_ops = {
  73. .is_enabled = wm831x_isink_is_enabled,
  74. .enable = wm831x_isink_enable,
  75. .disable = wm831x_isink_disable,
  76. .set_current_limit = regulator_set_current_limit_regmap,
  77. .get_current_limit = regulator_get_current_limit_regmap,
  78. };
  79. static irqreturn_t wm831x_isink_irq(int irq, void *data)
  80. {
  81. struct wm831x_isink *isink = data;
  82. regulator_notifier_call_chain(isink->regulator,
  83. REGULATOR_EVENT_OVER_CURRENT,
  84. NULL);
  85. return IRQ_HANDLED;
  86. }
  87. static int wm831x_isink_probe(struct platform_device *pdev)
  88. {
  89. struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
  90. struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
  91. struct wm831x_isink *isink;
  92. int id = pdev->id % ARRAY_SIZE(pdata->isink);
  93. struct regulator_config config = { };
  94. struct resource *res;
  95. int ret, irq;
  96. dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);
  97. if (pdata == NULL || pdata->isink[id] == NULL)
  98. return -ENODEV;
  99. isink = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_isink),
  100. GFP_KERNEL);
  101. if (!isink)
  102. return -ENOMEM;
  103. isink->wm831x = wm831x;
  104. res = platform_get_resource(pdev, IORESOURCE_REG, 0);
  105. if (res == NULL) {
  106. dev_err(&pdev->dev, "No REG resource\n");
  107. ret = -EINVAL;
  108. goto err;
  109. }
  110. isink->reg = res->start;
  111. /* For current parts this is correct; probably need to revisit
  112. * in future.
  113. */
  114. snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);
  115. isink->desc.name = isink->name;
  116. isink->desc.id = id;
  117. isink->desc.ops = &wm831x_isink_ops;
  118. isink->desc.type = REGULATOR_CURRENT;
  119. isink->desc.owner = THIS_MODULE;
  120. isink->desc.curr_table = wm831x_isinkv_values,
  121. isink->desc.n_current_limits = ARRAY_SIZE(wm831x_isinkv_values),
  122. isink->desc.csel_reg = isink->reg,
  123. isink->desc.csel_mask = WM831X_CS1_ISEL_MASK,
  124. config.dev = pdev->dev.parent;
  125. config.init_data = pdata->isink[id];
  126. config.driver_data = isink;
  127. config.regmap = wm831x->regmap;
  128. isink->regulator = devm_regulator_register(&pdev->dev, &isink->desc,
  129. &config);
  130. if (IS_ERR(isink->regulator)) {
  131. ret = PTR_ERR(isink->regulator);
  132. dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
  133. id + 1, ret);
  134. goto err;
  135. }
  136. irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0));
  137. ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
  138. wm831x_isink_irq,
  139. IRQF_TRIGGER_RISING | IRQF_ONESHOT,
  140. isink->name,
  141. isink);
  142. if (ret != 0) {
  143. dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
  144. irq, ret);
  145. goto err;
  146. }
  147. platform_set_drvdata(pdev, isink);
  148. return 0;
  149. err:
  150. return ret;
  151. }
  152. static struct platform_driver wm831x_isink_driver = {
  153. .probe = wm831x_isink_probe,
  154. .driver = {
  155. .name = "wm831x-isink",
  156. },
  157. };
  158. static int __init wm831x_isink_init(void)
  159. {
  160. int ret;
  161. ret = platform_driver_register(&wm831x_isink_driver);
  162. if (ret != 0)
  163. pr_err("Failed to register WM831x ISINK driver: %d\n", ret);
  164. return ret;
  165. }
  166. subsys_initcall(wm831x_isink_init);
  167. static void __exit wm831x_isink_exit(void)
  168. {
  169. platform_driver_unregister(&wm831x_isink_driver);
  170. }
  171. module_exit(wm831x_isink_exit);
  172. /* Module information */
  173. MODULE_AUTHOR("Mark Brown");
  174. MODULE_DESCRIPTION("WM831x current sink driver");
  175. MODULE_LICENSE("GPL");
  176. MODULE_ALIAS("platform:wm831x-isink");