1/* 2 * LEDs driver for PCEngines WRAP 3 * 4 * Copyright (C) 2006 Kristian Kielhofner <kris@krisk.org> 5 * 6 * Based on leds-net48xx.c 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13#include <linux/kernel.h> 14#include <linux/init.h> 15#include <linux/platform_device.h> 16#include <linux/leds.h> 17#include <linux/err.h> 18#include <asm/io.h> 19#include <linux/scx200_gpio.h> 20 21#define DRVNAME "wrap-led" 22#define WRAP_POWER_LED_GPIO 2 23#define WRAP_ERROR_LED_GPIO 3 24#define WRAP_EXTRA_LED_GPIO 18 25 26static struct platform_device *pdev; 27 28static void wrap_power_led_set(struct led_classdev *led_cdev, 29 enum led_brightness value) 30{ 31 if (value) 32 scx200_gpio_set_low(WRAP_POWER_LED_GPIO); 33 else 34 scx200_gpio_set_high(WRAP_POWER_LED_GPIO); 35} 36 37static void wrap_error_led_set(struct led_classdev *led_cdev, 38 enum led_brightness value) 39{ 40 if (value) 41 scx200_gpio_set_low(WRAP_ERROR_LED_GPIO); 42 else 43 scx200_gpio_set_high(WRAP_ERROR_LED_GPIO); 44} 45 46static void wrap_extra_led_set(struct led_classdev *led_cdev, 47 enum led_brightness value) 48{ 49 if (value) 50 scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO); 51 else 52 scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO); 53} 54 55static struct led_classdev wrap_power_led = { 56 .name = "wrap::power", 57 .brightness_set = wrap_power_led_set, 58 .default_trigger = "default-on", 59 .flags = LED_CORE_SUSPENDRESUME, 60}; 61 62static struct led_classdev wrap_error_led = { 63 .name = "wrap::error", 64 .brightness_set = wrap_error_led_set, 65 .flags = LED_CORE_SUSPENDRESUME, 66}; 67 68static struct led_classdev wrap_extra_led = { 69 .name = "wrap::extra", 70 .brightness_set = wrap_extra_led_set, 71 .flags = LED_CORE_SUSPENDRESUME, 72}; 73 74static int wrap_led_probe(struct platform_device *pdev) 75{ 76 int ret; 77 78 ret = led_classdev_register(&pdev->dev, &wrap_power_led); 79 if (ret < 0) 80 return ret; 81 82 ret = led_classdev_register(&pdev->dev, &wrap_error_led); 83 if (ret < 0) 84 goto err1; 85 86 ret = led_classdev_register(&pdev->dev, &wrap_extra_led); 87 if (ret < 0) 88 goto err2; 89 90 return ret; 91 92err2: 93 led_classdev_unregister(&wrap_error_led); 94err1: 95 led_classdev_unregister(&wrap_power_led); 96 97 return ret; 98} 99 100static int wrap_led_remove(struct platform_device *pdev) 101{ 102 led_classdev_unregister(&wrap_power_led); 103 led_classdev_unregister(&wrap_error_led); 104 led_classdev_unregister(&wrap_extra_led); 105 return 0; 106} 107 108static struct platform_driver wrap_led_driver = { 109 .probe = wrap_led_probe, 110 .remove = wrap_led_remove, 111 .driver = { 112 .name = DRVNAME, 113 .owner = THIS_MODULE, 114 }, 115}; 116 117static int __init wrap_led_init(void) 118{ 119 int ret; 120 121 if (!scx200_gpio_present()) { 122 ret = -ENODEV; 123 goto out; 124 } 125 126 ret = platform_driver_register(&wrap_led_driver); 127 if (ret < 0) 128 goto out; 129 130 pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0); 131 if (IS_ERR(pdev)) { 132 ret = PTR_ERR(pdev); 133 platform_driver_unregister(&wrap_led_driver); 134 goto out; 135 } 136 137out: 138 return ret; 139} 140 141static void __exit wrap_led_exit(void) 142{ 143 platform_device_unregister(pdev); 144 platform_driver_unregister(&wrap_led_driver); 145} 146 147module_init(wrap_led_init); 148module_exit(wrap_led_exit); 149 150MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>"); 151MODULE_DESCRIPTION("PCEngines WRAP LED driver"); 152MODULE_LICENSE("GPL"); 153