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https://github.com/edk2-porting/linux-next.git
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6c152beefb
As discussed on LKML some notion of 'function' is needed in LED naming. This patch adds this to the documentation and standardises existing LED drivers. Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
/*
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* LEDs driver for Soekris net48xx
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*
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* Copyright (C) 2006 Chris Boot <bootc@bootc.net>
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*
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* Based on leds-ams-delta.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#include <linux/err.h>
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#include <asm/io.h>
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#include <linux/nsc_gpio.h>
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#include <linux/scx200_gpio.h>
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#define DRVNAME "net48xx-led"
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#define NET48XX_ERROR_LED_GPIO 20
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static struct platform_device *pdev;
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static void net48xx_error_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0);
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}
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static struct led_classdev net48xx_error_led = {
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.name = "net48xx::error",
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.brightness_set = net48xx_error_led_set,
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};
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#ifdef CONFIG_PM
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static int net48xx_led_suspend(struct platform_device *dev,
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pm_message_t state)
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{
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led_classdev_suspend(&net48xx_error_led);
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return 0;
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}
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static int net48xx_led_resume(struct platform_device *dev)
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{
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led_classdev_resume(&net48xx_error_led);
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return 0;
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}
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#else
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#define net48xx_led_suspend NULL
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#define net48xx_led_resume NULL
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#endif
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static int net48xx_led_probe(struct platform_device *pdev)
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{
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return led_classdev_register(&pdev->dev, &net48xx_error_led);
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}
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static int net48xx_led_remove(struct platform_device *pdev)
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{
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led_classdev_unregister(&net48xx_error_led);
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return 0;
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}
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static struct platform_driver net48xx_led_driver = {
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.probe = net48xx_led_probe,
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.remove = net48xx_led_remove,
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.suspend = net48xx_led_suspend,
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.resume = net48xx_led_resume,
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.driver = {
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.name = DRVNAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init net48xx_led_init(void)
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{
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int ret;
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/* small hack, but scx200_gpio doesn't set .dev if the probe fails */
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if (!scx200_gpio_ops.dev) {
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ret = -ENODEV;
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goto out;
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}
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ret = platform_driver_register(&net48xx_led_driver);
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if (ret < 0)
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goto out;
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pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
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if (IS_ERR(pdev)) {
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ret = PTR_ERR(pdev);
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platform_driver_unregister(&net48xx_led_driver);
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goto out;
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}
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out:
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return ret;
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}
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static void __exit net48xx_led_exit(void)
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{
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platform_device_unregister(pdev);
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platform_driver_unregister(&net48xx_led_driver);
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}
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module_init(net48xx_led_init);
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module_exit(net48xx_led_exit);
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MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
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MODULE_DESCRIPTION("Soekris net48xx LED driver");
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MODULE_LICENSE("GPL");
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