leds-wrap.c 2.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * LEDs driver for PCEngines WRAP
  4. *
  5. * Copyright (C) 2006 Kristian Kielhofner <kris@krisk.org>
  6. *
  7. * Based on leds-net48xx.c
  8. */
  9. #include <linux/kernel.h>
  10. #include <linux/init.h>
  11. #include <linux/platform_device.h>
  12. #include <linux/leds.h>
  13. #include <linux/err.h>
  14. #include <linux/io.h>
  15. #include <linux/scx200_gpio.h>
  16. #include <linux/module.h>
  17. #define DRVNAME "wrap-led"
  18. #define WRAP_POWER_LED_GPIO 2
  19. #define WRAP_ERROR_LED_GPIO 3
  20. #define WRAP_EXTRA_LED_GPIO 18
  21. static struct platform_device *pdev;
  22. static void wrap_power_led_set(struct led_classdev *led_cdev,
  23. enum led_brightness value)
  24. {
  25. if (value)
  26. scx200_gpio_set_low(WRAP_POWER_LED_GPIO);
  27. else
  28. scx200_gpio_set_high(WRAP_POWER_LED_GPIO);
  29. }
  30. static void wrap_error_led_set(struct led_classdev *led_cdev,
  31. enum led_brightness value)
  32. {
  33. if (value)
  34. scx200_gpio_set_low(WRAP_ERROR_LED_GPIO);
  35. else
  36. scx200_gpio_set_high(WRAP_ERROR_LED_GPIO);
  37. }
  38. static void wrap_extra_led_set(struct led_classdev *led_cdev,
  39. enum led_brightness value)
  40. {
  41. if (value)
  42. scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO);
  43. else
  44. scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO);
  45. }
  46. static struct led_classdev wrap_power_led = {
  47. .name = "wrap::power",
  48. .brightness_set = wrap_power_led_set,
  49. .default_trigger = "default-on",
  50. .flags = LED_CORE_SUSPENDRESUME,
  51. };
  52. static struct led_classdev wrap_error_led = {
  53. .name = "wrap::error",
  54. .brightness_set = wrap_error_led_set,
  55. .flags = LED_CORE_SUSPENDRESUME,
  56. };
  57. static struct led_classdev wrap_extra_led = {
  58. .name = "wrap::extra",
  59. .brightness_set = wrap_extra_led_set,
  60. .flags = LED_CORE_SUSPENDRESUME,
  61. };
  62. static int wrap_led_probe(struct platform_device *pdev)
  63. {
  64. int ret;
  65. ret = devm_led_classdev_register(&pdev->dev, &wrap_power_led);
  66. if (ret < 0)
  67. return ret;
  68. ret = devm_led_classdev_register(&pdev->dev, &wrap_error_led);
  69. if (ret < 0)
  70. return ret;
  71. return devm_led_classdev_register(&pdev->dev, &wrap_extra_led);
  72. }
  73. static struct platform_driver wrap_led_driver = {
  74. .probe = wrap_led_probe,
  75. .driver = {
  76. .name = DRVNAME,
  77. },
  78. };
  79. static int __init wrap_led_init(void)
  80. {
  81. int ret;
  82. if (!scx200_gpio_present()) {
  83. ret = -ENODEV;
  84. goto out;
  85. }
  86. ret = platform_driver_register(&wrap_led_driver);
  87. if (ret < 0)
  88. goto out;
  89. pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
  90. if (IS_ERR(pdev)) {
  91. ret = PTR_ERR(pdev);
  92. platform_driver_unregister(&wrap_led_driver);
  93. goto out;
  94. }
  95. out:
  96. return ret;
  97. }
  98. static void __exit wrap_led_exit(void)
  99. {
  100. platform_device_unregister(pdev);
  101. platform_driver_unregister(&wrap_led_driver);
  102. }
  103. module_init(wrap_led_init);
  104. module_exit(wrap_led_exit);
  105. MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
  106. MODULE_DESCRIPTION("PCEngines WRAP LED driver");
  107. MODULE_LICENSE("GPL");