gpio-wcd934x.c 3.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. // Copyright (c) 2019, Linaro Limited
  3. #include <linux/module.h>
  4. #include <linux/gpio/driver.h>
  5. #include <linux/regmap.h>
  6. #include <linux/slab.h>
  7. #include <linux/of_device.h>
  8. #define WCD_PIN_MASK(p) BIT(p)
  9. #define WCD_REG_DIR_CTL_OFFSET 0x42
  10. #define WCD_REG_VAL_CTL_OFFSET 0x43
  11. #define WCD934X_NPINS 5
  12. struct wcd_gpio_data {
  13. struct regmap *map;
  14. struct gpio_chip chip;
  15. };
  16. static int wcd_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)
  17. {
  18. struct wcd_gpio_data *data = gpiochip_get_data(chip);
  19. unsigned int value;
  20. int ret;
  21. ret = regmap_read(data->map, WCD_REG_DIR_CTL_OFFSET, &value);
  22. if (ret < 0)
  23. return ret;
  24. if (value & WCD_PIN_MASK(pin))
  25. return GPIO_LINE_DIRECTION_OUT;
  26. return GPIO_LINE_DIRECTION_IN;
  27. }
  28. static int wcd_gpio_direction_input(struct gpio_chip *chip, unsigned int pin)
  29. {
  30. struct wcd_gpio_data *data = gpiochip_get_data(chip);
  31. return regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET,
  32. WCD_PIN_MASK(pin), 0);
  33. }
  34. static int wcd_gpio_direction_output(struct gpio_chip *chip, unsigned int pin,
  35. int val)
  36. {
  37. struct wcd_gpio_data *data = gpiochip_get_data(chip);
  38. regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET,
  39. WCD_PIN_MASK(pin), WCD_PIN_MASK(pin));
  40. return regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET,
  41. WCD_PIN_MASK(pin),
  42. val ? WCD_PIN_MASK(pin) : 0);
  43. }
  44. static int wcd_gpio_get(struct gpio_chip *chip, unsigned int pin)
  45. {
  46. struct wcd_gpio_data *data = gpiochip_get_data(chip);
  47. unsigned int value;
  48. regmap_read(data->map, WCD_REG_VAL_CTL_OFFSET, &value);
  49. return !!(value & WCD_PIN_MASK(pin));
  50. }
  51. static void wcd_gpio_set(struct gpio_chip *chip, unsigned int pin, int val)
  52. {
  53. struct wcd_gpio_data *data = gpiochip_get_data(chip);
  54. regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET,
  55. WCD_PIN_MASK(pin), val ? WCD_PIN_MASK(pin) : 0);
  56. }
  57. static int wcd_gpio_probe(struct platform_device *pdev)
  58. {
  59. struct device *dev = &pdev->dev;
  60. struct wcd_gpio_data *data;
  61. struct gpio_chip *chip;
  62. data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
  63. if (!data)
  64. return -ENOMEM;
  65. data->map = dev_get_regmap(dev->parent, NULL);
  66. if (!data->map) {
  67. dev_err(dev, "%s: failed to get regmap\n", __func__);
  68. return -EINVAL;
  69. }
  70. chip = &data->chip;
  71. chip->direction_input = wcd_gpio_direction_input;
  72. chip->direction_output = wcd_gpio_direction_output;
  73. chip->get_direction = wcd_gpio_get_direction;
  74. chip->get = wcd_gpio_get;
  75. chip->set = wcd_gpio_set;
  76. chip->parent = dev;
  77. chip->base = -1;
  78. chip->ngpio = WCD934X_NPINS;
  79. chip->label = dev_name(dev);
  80. chip->of_gpio_n_cells = 2;
  81. chip->can_sleep = false;
  82. return devm_gpiochip_add_data(dev, chip, data);
  83. }
  84. static const struct of_device_id wcd_gpio_of_match[] = {
  85. { .compatible = "qcom,wcd9340-gpio" },
  86. { .compatible = "qcom,wcd9341-gpio" },
  87. { }
  88. };
  89. MODULE_DEVICE_TABLE(of, wcd_gpio_of_match);
  90. static struct platform_driver wcd_gpio_driver = {
  91. .driver = {
  92. .name = "wcd934x-gpio",
  93. .of_match_table = wcd_gpio_of_match,
  94. },
  95. .probe = wcd_gpio_probe,
  96. };
  97. module_platform_driver(wcd_gpio_driver);
  98. MODULE_DESCRIPTION("Qualcomm Technologies, Inc WCD GPIO control driver");
  99. MODULE_LICENSE("GPL v2");