+++ /dev/null
-/*
- * 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");
projects / linux-2.6 / commitdiff