linux/drivers/leds/leds-fsg.c
Sven Wegener 07f696c777 leds-fsg: change order of initialization and deinitialization
On initialization, we first do the ioremap and then register the led devices.
On deinitialization, we do it in reverse order. This prevents someone calling
into the brightness_set functions with an invalid latch_address.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
Acked-by: Rod Whitby <rod@whitby.id.au>
Acked-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-03 18:22:18 -07:00

261 lines
5.6 KiB
C

/*
* LED Driver for the Freecom FSG-3
*
* Copyright (c) 2008 Rod Whitby <rod@whitby.id.au>
*
* Author: Rod Whitby <rod@whitby.id.au>
*
* Based on leds-spitz.c
* Copyright 2005-2006 Openedhand Ltd.
* Author: Richard Purdie <rpurdie@openedhand.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <mach/hardware.h>
#include <asm/io.h>
static short __iomem *latch_address;
static unsigned short latch_value;
static void fsg_led_wlan_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
if (value) {
latch_value &= ~(1 << FSG_LED_WLAN_BIT);
*latch_address = latch_value;
} else {
latch_value |= (1 << FSG_LED_WLAN_BIT);
*latch_address = latch_value;
}
}
static void fsg_led_wan_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
if (value) {
latch_value &= ~(1 << FSG_LED_WAN_BIT);
*latch_address = latch_value;
} else {
latch_value |= (1 << FSG_LED_WAN_BIT);
*latch_address = latch_value;
}
}
static void fsg_led_sata_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
if (value) {
latch_value &= ~(1 << FSG_LED_SATA_BIT);
*latch_address = latch_value;
} else {
latch_value |= (1 << FSG_LED_SATA_BIT);
*latch_address = latch_value;
}
}
static void fsg_led_usb_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
if (value) {
latch_value &= ~(1 << FSG_LED_USB_BIT);
*latch_address = latch_value;
} else {
latch_value |= (1 << FSG_LED_USB_BIT);
*latch_address = latch_value;
}
}
static void fsg_led_sync_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
if (value) {
latch_value &= ~(1 << FSG_LED_SYNC_BIT);
*latch_address = latch_value;
} else {
latch_value |= (1 << FSG_LED_SYNC_BIT);
*latch_address = latch_value;
}
}
static void fsg_led_ring_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
if (value) {
latch_value &= ~(1 << FSG_LED_RING_BIT);
*latch_address = latch_value;
} else {
latch_value |= (1 << FSG_LED_RING_BIT);
*latch_address = latch_value;
}
}
static struct led_classdev fsg_wlan_led = {
.name = "fsg:blue:wlan",
.brightness_set = fsg_led_wlan_set,
};
static struct led_classdev fsg_wan_led = {
.name = "fsg:blue:wan",
.brightness_set = fsg_led_wan_set,
};
static struct led_classdev fsg_sata_led = {
.name = "fsg:blue:sata",
.brightness_set = fsg_led_sata_set,
};
static struct led_classdev fsg_usb_led = {
.name = "fsg:blue:usb",
.brightness_set = fsg_led_usb_set,
};
static struct led_classdev fsg_sync_led = {
.name = "fsg:blue:sync",
.brightness_set = fsg_led_sync_set,
};
static struct led_classdev fsg_ring_led = {
.name = "fsg:blue:ring",
.brightness_set = fsg_led_ring_set,
};
#ifdef CONFIG_PM
static int fsg_led_suspend(struct platform_device *dev, pm_message_t state)
{
led_classdev_suspend(&fsg_wlan_led);
led_classdev_suspend(&fsg_wan_led);
led_classdev_suspend(&fsg_sata_led);
led_classdev_suspend(&fsg_usb_led);
led_classdev_suspend(&fsg_sync_led);
led_classdev_suspend(&fsg_ring_led);
return 0;
}
static int fsg_led_resume(struct platform_device *dev)
{
led_classdev_resume(&fsg_wlan_led);
led_classdev_resume(&fsg_wan_led);
led_classdev_resume(&fsg_sata_led);
led_classdev_resume(&fsg_usb_led);
led_classdev_resume(&fsg_sync_led);
led_classdev_resume(&fsg_ring_led);
return 0;
}
#endif
static int fsg_led_probe(struct platform_device *pdev)
{
int ret;
/* Map the LED chip select address space */
latch_address = (unsigned short *) ioremap(IXP4XX_EXP_BUS_BASE(2), 512);
if (!latch_address) {
ret = -ENOMEM;
goto failremap;
}
latch_value = 0xffff;
*latch_address = latch_value;
ret = led_classdev_register(&pdev->dev, &fsg_wlan_led);
if (ret < 0)
goto failwlan;
ret = led_classdev_register(&pdev->dev, &fsg_wan_led);
if (ret < 0)
goto failwan;
ret = led_classdev_register(&pdev->dev, &fsg_sata_led);
if (ret < 0)
goto failsata;
ret = led_classdev_register(&pdev->dev, &fsg_usb_led);
if (ret < 0)
goto failusb;
ret = led_classdev_register(&pdev->dev, &fsg_sync_led);
if (ret < 0)
goto failsync;
ret = led_classdev_register(&pdev->dev, &fsg_ring_led);
if (ret < 0)
goto failring;
return ret;
failring:
led_classdev_unregister(&fsg_sync_led);
failsync:
led_classdev_unregister(&fsg_usb_led);
failusb:
led_classdev_unregister(&fsg_sata_led);
failsata:
led_classdev_unregister(&fsg_wan_led);
failwan:
led_classdev_unregister(&fsg_wlan_led);
failwlan:
iounmap(latch_address);
failremap:
return ret;
}
static int fsg_led_remove(struct platform_device *pdev)
{
led_classdev_unregister(&fsg_wlan_led);
led_classdev_unregister(&fsg_wan_led);
led_classdev_unregister(&fsg_sata_led);
led_classdev_unregister(&fsg_usb_led);
led_classdev_unregister(&fsg_sync_led);
led_classdev_unregister(&fsg_ring_led);
iounmap(latch_address);
return 0;
}
static struct platform_driver fsg_led_driver = {
.probe = fsg_led_probe,
.remove = fsg_led_remove,
#ifdef CONFIG_PM
.suspend = fsg_led_suspend,
.resume = fsg_led_resume,
#endif
.driver = {
.name = "fsg-led",
},
};
static int __init fsg_led_init(void)
{
return platform_driver_register(&fsg_led_driver);
}
static void __exit fsg_led_exit(void)
{
platform_driver_unregister(&fsg_led_driver);
}
module_init(fsg_led_init);
module_exit(fsg_led_exit);
MODULE_AUTHOR("Rod Whitby <rod@whitby.id.au>");
MODULE_DESCRIPTION("Freecom FSG-3 LED driver");
MODULE_LICENSE("GPL");