1 /* 2 * LEDs driver for Soekris net48xx 3 * 4 * Copyright (C) 2006 Chris Boot <bootc@bootc.net> 5 * 6 * Based on leds-ams-delta.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 <linux/io.h> 19 #include <linux/nsc_gpio.h> 20 #include <linux/scx200_gpio.h> 21 #include <linux/module.h> 22 23 #define DRVNAME "net48xx-led" 24 #define NET48XX_ERROR_LED_GPIO 20 25 26 static struct platform_device *pdev; 27 28 static void net48xx_error_led_set(struct led_classdev *led_cdev, 29 enum led_brightness value) 30 { 31 scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0); 32 } 33 34 static struct led_classdev net48xx_error_led = { 35 .name = "net48xx::error", 36 .brightness_set = net48xx_error_led_set, 37 .flags = LED_CORE_SUSPENDRESUME, 38 }; 39 40 static int net48xx_led_probe(struct platform_device *pdev) 41 { 42 return devm_led_classdev_register(&pdev->dev, &net48xx_error_led); 43 } 44 45 static struct platform_driver net48xx_led_driver = { 46 .probe = net48xx_led_probe, 47 .driver = { 48 .name = DRVNAME, 49 }, 50 }; 51 52 static int __init net48xx_led_init(void) 53 { 54 int ret; 55 56 /* small hack, but scx200_gpio doesn't set .dev if the probe fails */ 57 if (!scx200_gpio_ops.dev) { 58 ret = -ENODEV; 59 goto out; 60 } 61 62 ret = platform_driver_register(&net48xx_led_driver); 63 if (ret < 0) 64 goto out; 65 66 pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0); 67 if (IS_ERR(pdev)) { 68 ret = PTR_ERR(pdev); 69 platform_driver_unregister(&net48xx_led_driver); 70 goto out; 71 } 72 73 out: 74 return ret; 75 } 76 77 static void __exit net48xx_led_exit(void) 78 { 79 platform_device_unregister(pdev); 80 platform_driver_unregister(&net48xx_led_driver); 81 } 82 83 module_init(net48xx_led_init); 84 module_exit(net48xx_led_exit); 85 86 MODULE_AUTHOR("Chris Boot <bootc@bootc.net>"); 87 MODULE_DESCRIPTION("Soekris net48xx LED driver"); 88 MODULE_LICENSE("GPL"); 89 90