diff options
Diffstat (limited to 'drivers/leds/leds-ixp4xx-gpio.c')
| -rw-r--r-- | drivers/leds/leds-ixp4xx-gpio.c | 214 |
1 files changed, 0 insertions, 214 deletions
diff --git a/drivers/leds/leds-ixp4xx-gpio.c b/drivers/leds/leds-ixp4xx-gpio.c deleted file mode 100644 index 7dcf0b9..0000000 --- a/drivers/leds/leds-ixp4xx-gpio.c +++ /dev/null @@ -1,214 +0,0 @@ -/* - * IXP4XX GPIO driver LED driver - * - * Author: John Bowler <jbowler@acm.org> - * - * Copyright (c) 2006 John Bowler - * - * Permission is hereby granted, free of charge, to any - * person obtaining a copy of this software and associated - * documentation files (the "Software"), to deal in the - * Software without restriction, including without - * limitation the rights to use, copy, modify, merge, - * publish, distribute, sublicense, and/or sell copies of - * the Software, and to permit persons to whom the - * Software is furnished to do so, subject to the - * following conditions: - * - * The above copyright notice and this permission notice - * shall be included in all copies or substantial portions - * of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF - * ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED - * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A - * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT - * SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR - * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN - * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR - * OTHER DEALINGS IN THE SOFTWARE. - * - */ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/platform_device.h> -#include <linux/spinlock.h> -#include <linux/leds.h> -#include <asm/arch/hardware.h> - -extern spinlock_t gpio_lock; - -/* Up to 16 gpio lines are possible. */ -#define GPIO_MAX 16 -static struct ixp4xxgpioled_device { - struct led_classdev ancestor; - int flags; -} ixp4xxgpioled_devices[GPIO_MAX]; - -void ixp4xxgpioled_brightness_set(struct led_classdev *pled, - enum led_brightness value) -{ - const struct ixp4xxgpioled_device *const ixp4xx_dev = - container_of(pled, struct ixp4xxgpioled_device, ancestor); - const u32 gpio_pin = ixp4xx_dev - ixp4xxgpioled_devices; - - if (gpio_pin < GPIO_MAX && ixp4xx_dev->ancestor.name != 0) { - /* Set or clear the 'gpio_pin' bit according to the style - * and the required setting (value > 0 == on) - */ - const int gpio_value = - (value > 0) == (ixp4xx_dev->flags != IXP4XX_GPIO_LOW) ? - IXP4XX_GPIO_HIGH : IXP4XX_GPIO_LOW; - - { - unsigned long flags; - spin_lock_irqsave(&gpio_lock, flags); - gpio_line_set(gpio_pin, gpio_value); - spin_unlock_irqrestore(&gpio_lock, flags); - } - } -} - -/* LEDs are described in resources, the following iterates over the valid - * LED resources. - */ -#define for_all_leds(i, pdev) \ - for (i=0; i<pdev->num_resources; ++i) \ - if (pdev->resource[i].start < GPIO_MAX && \ - pdev->resource[i].name != 0) - -/* The following applies 'operation' to each LED from the given platform, - * the function always returns 0 to allow tail call elimination. - */ -static int apply_to_all_leds(struct platform_device *pdev, - void (*operation)(struct led_classdev *pled)) -{ - int i; - - for_all_leds(i, pdev) - operation(&ixp4xxgpioled_devices[pdev->resource[i].start].ancestor); - return 0; -} - -#ifdef CONFIG_PM -static int ixp4xxgpioled_suspend(struct platform_device *pdev, - pm_message_t state) -{ - return apply_to_all_leds(pdev, led_classdev_suspend); -} - -static int ixp4xxgpioled_resume(struct platform_device *pdev) -{ - return apply_to_all_leds(pdev, led_classdev_resume); -} -#endif - -static void ixp4xxgpioled_remove_one_led(struct led_classdev *pled) -{ - led_classdev_unregister(pled); - pled->name = 0; -} - -static int ixp4xxgpioled_remove(struct platform_device *pdev) -{ - return apply_to_all_leds(pdev, ixp4xxgpioled_remove_one_led); -} - -static int ixp4xxgpioled_probe(struct platform_device *pdev) -{ - /* The board level has to tell the driver where the - * LEDs are connected - there is no way to find out - * electrically. It must also say whether the GPIO - * lines are active high or active low. - * - * To do this read the num_resources (the number of - * LEDs) and the struct resource (the data for each - * LED). The name comes from the resource, and it - * isn't copied. - */ - int i; - - for_all_leds(i, pdev) { - const u8 gpio_pin = pdev->resource[i].start; - int rc; - - if (ixp4xxgpioled_devices[gpio_pin].ancestor.name == 0) { - unsigned long flags; - - spin_lock_irqsave(&gpio_lock, flags); - gpio_line_config(gpio_pin, IXP4XX_GPIO_OUT); - /* The config can, apparently, reset the state, - * I suspect the gpio line may be an input and - * the config may cause the line to be latched, - * so the setting depends on how the LED is - * connected to the line (which affects how it - * floats if not driven). - */ - gpio_line_set(gpio_pin, IXP4XX_GPIO_HIGH); - spin_unlock_irqrestore(&gpio_lock, flags); - - ixp4xxgpioled_devices[gpio_pin].flags = - pdev->resource[i].flags & IORESOURCE_BITS; - - ixp4xxgpioled_devices[gpio_pin].ancestor.name = - pdev->resource[i].name; - - /* This is how a board manufacturer makes the LED - * come on on reset - the GPIO line will be high, so - * make the LED light when the line is low... - */ - if (ixp4xxgpioled_devices[gpio_pin].flags != IXP4XX_GPIO_LOW) - ixp4xxgpioled_devices[gpio_pin].ancestor.brightness = 100; - else - ixp4xxgpioled_devices[gpio_pin].ancestor.brightness = 0; - - ixp4xxgpioled_devices[gpio_pin].ancestor.flags = 0; - - ixp4xxgpioled_devices[gpio_pin].ancestor.brightness_set = - ixp4xxgpioled_brightness_set; - - ixp4xxgpioled_devices[gpio_pin].ancestor.default_trigger = 0; - } - - rc = led_classdev_register(&pdev->dev, - &ixp4xxgpioled_devices[gpio_pin].ancestor); - if (rc < 0) { - ixp4xxgpioled_devices[gpio_pin].ancestor.name = 0; - ixp4xxgpioled_remove(pdev); - return rc; - } - } - - return 0; -} - -static struct platform_driver ixp4xxgpioled_driver = { - .probe = ixp4xxgpioled_probe, - .remove = ixp4xxgpioled_remove, -#ifdef CONFIG_PM - .suspend = ixp4xxgpioled_suspend, - .resume = ixp4xxgpioled_resume, -#endif - .driver = { - .name = "IXP4XX-GPIO-LED", - }, -}; - -static int __init ixp4xxgpioled_init(void) -{ - return platform_driver_register(&ixp4xxgpioled_driver); -} - -static void __exit ixp4xxgpioled_exit(void) -{ - platform_driver_unregister(&ixp4xxgpioled_driver); -} - -module_init(ixp4xxgpioled_init); -module_exit(ixp4xxgpioled_exit); - -MODULE_AUTHOR("John Bowler <jbowler@acm.org>"); -MODULE_DESCRIPTION("IXP4XX GPIO LED driver"); -MODULE_LICENSE("Dual MIT/GPL"); |
