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b0edba7ef8
A pointer to h1940leds_probe is passed to the core via platform_driver_register and so the function must not disappear when the .init sections are discarded. Otherwise (if also having HOTPLUG=y) unbinding and binding a device to the driver via sysfs will result in an oops as does a device being registered late. An alternative to this patch is using platform_driver_probe instead of platform_driver_register plus removing the pointer to the probe function from the struct platform_driver. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
169 lines
3.7 KiB
C
169 lines
3.7 KiB
C
/*
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* drivers/leds/leds-h1940.c
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* Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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* H1940 leds driver
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*
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/leds.h>
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#include <mach/regs-gpio.h>
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#include <mach/hardware.h>
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#include <mach/h1940-latch.h>
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/*
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* Green led.
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*/
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static void h1940_greenled_set(struct led_classdev *led_dev,
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enum led_brightness value)
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{
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switch (value) {
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case LED_HALF:
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h1940_latch_control(0, H1940_LATCH_LED_FLASH);
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s3c2410_gpio_setpin(S3C2410_GPA7, 1);
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break;
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case LED_FULL:
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h1940_latch_control(0, H1940_LATCH_LED_GREEN);
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s3c2410_gpio_setpin(S3C2410_GPA7, 1);
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break;
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default:
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case LED_OFF:
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h1940_latch_control(H1940_LATCH_LED_FLASH, 0);
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h1940_latch_control(H1940_LATCH_LED_GREEN, 0);
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s3c2410_gpio_setpin(S3C2410_GPA7, 0);
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break;
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}
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}
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static struct led_classdev h1940_greenled = {
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.name = "h1940:green",
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.brightness_set = h1940_greenled_set,
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.default_trigger = "h1940-charger",
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};
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/*
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* Red led.
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*/
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static void h1940_redled_set(struct led_classdev *led_dev,
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enum led_brightness value)
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{
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switch (value) {
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case LED_HALF:
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h1940_latch_control(0, H1940_LATCH_LED_FLASH);
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s3c2410_gpio_setpin(S3C2410_GPA1, 1);
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break;
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case LED_FULL:
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h1940_latch_control(0, H1940_LATCH_LED_RED);
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s3c2410_gpio_setpin(S3C2410_GPA1, 1);
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break;
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default:
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case LED_OFF:
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h1940_latch_control(H1940_LATCH_LED_FLASH, 0);
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h1940_latch_control(H1940_LATCH_LED_RED, 0);
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s3c2410_gpio_setpin(S3C2410_GPA1, 0);
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break;
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}
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}
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static struct led_classdev h1940_redled = {
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.name = "h1940:red",
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.brightness_set = h1940_redled_set,
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.default_trigger = "h1940-charger",
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};
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/*
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* Blue led.
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* (it can only be blue flashing led)
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*/
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static void h1940_blueled_set(struct led_classdev *led_dev,
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enum led_brightness value)
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{
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if (value) {
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/* flashing Blue */
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h1940_latch_control(0, H1940_LATCH_LED_FLASH);
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s3c2410_gpio_setpin(S3C2410_GPA3, 1);
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} else {
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h1940_latch_control(H1940_LATCH_LED_FLASH, 0);
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s3c2410_gpio_setpin(S3C2410_GPA3, 0);
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}
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}
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static struct led_classdev h1940_blueled = {
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.name = "h1940:blue",
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.brightness_set = h1940_blueled_set,
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.default_trigger = "h1940-bluetooth",
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};
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static int __devinit h1940leds_probe(struct platform_device *pdev)
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{
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int ret;
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ret = led_classdev_register(&pdev->dev, &h1940_greenled);
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if (ret)
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goto err_green;
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ret = led_classdev_register(&pdev->dev, &h1940_redled);
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if (ret)
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goto err_red;
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ret = led_classdev_register(&pdev->dev, &h1940_blueled);
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if (ret)
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goto err_blue;
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return 0;
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err_blue:
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led_classdev_unregister(&h1940_redled);
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err_red:
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led_classdev_unregister(&h1940_greenled);
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err_green:
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return ret;
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}
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static int h1940leds_remove(struct platform_device *pdev)
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{
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led_classdev_unregister(&h1940_greenled);
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led_classdev_unregister(&h1940_redled);
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led_classdev_unregister(&h1940_blueled);
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return 0;
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}
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static struct platform_driver h1940leds_driver = {
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.driver = {
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.name = "h1940-leds",
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.owner = THIS_MODULE,
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},
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.probe = h1940leds_probe,
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.remove = h1940leds_remove,
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};
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static int __init h1940leds_init(void)
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{
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return platform_driver_register(&h1940leds_driver);
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}
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static void __exit h1940leds_exit(void)
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{
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platform_driver_unregister(&h1940leds_driver);
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}
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module_init(h1940leds_init);
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module_exit(h1940leds_exit);
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MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
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MODULE_DESCRIPTION("LED driver for the iPAQ H1940");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:h1940-leds");
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