diff options
Diffstat (limited to 'packages/linux/ixp4xx-kernel/2.6.15/95-ixp4xx-leds.patch')
| -rw-r--r-- | packages/linux/ixp4xx-kernel/2.6.15/95-ixp4xx-leds.patch | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/packages/linux/ixp4xx-kernel/2.6.15/95-ixp4xx-leds.patch b/packages/linux/ixp4xx-kernel/2.6.15/95-ixp4xx-leds.patch new file mode 100644 index 0000000000..b081519893 --- /dev/null +++ b/packages/linux/ixp4xx-kernel/2.6.15/95-ixp4xx-leds.patch @@ -0,0 +1,260 @@ +NEW_LEDS support for ixp4xx boards where LEDs are connected +to the GPIO lines. + +This includes a new generic ixp4xx driver (leds-ixp4xx-gpio.c +name "IXP4XX-GPIO-LED") and a patch to the original leds.h to +make the 'name' field of led_device (const char) + +Signed-off-by: John Bowler <jbowler@acm.org> + +--- linux-2.6.15/drivers/leds/Kconfig 1970-01-01 00:00:00.000000000 +0000 ++++ linux-2.6.15/drivers/leds/Kconfig 1970-01-01 00:00:00.000000000 +0000 +@@ -43,6 +43,15 @@ config LEDS_SPITZ + This option enables support for the LEDs on Sharp Zaurus + SL-Cxx00 series (C1000, C3000, C3100). + ++config LEDS_IXP4XX ++ tristate "LED Support for GPIO connected LEDs on IXP4XX processors" ++ depends LEDS_CLASS && ARCH_IXP4XX ++ help ++ This option enables support for the LEDs connected to GPIO ++ outputs of the Intel IXP4XX processors. To be useful the ++ particular board must have LEDs and they must be connected ++ to the GPIO lines. If unsure, say Y. ++ + config LEDS_TRIGGER_TIMER + tristate "LED Timer Trigger" + depends LEDS_TRIGGERS +--- linux-2.6.15/drivers/leds/Makefile 1970-01-01 00:00:00.000000000 +0000 ++++ linux-2.6.15/drivers/leds/Makefile 1970-01-01 00:00:00.000000000 +0000 +@@ -8,6 +8,7 @@ obj-$(CONFIG_LEDS_TRIGGERS) += led-trig + obj-$(CONFIG_LEDS_CORGI) += leds-corgi.o + obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o + obj-$(CONFIG_LEDS_SPITZ) += leds-spitz.o ++obj-$(CONFIG_LEDS_IXP4XX) += leds-ixp4xx-gpio.o + + # LED Triggers + obj-$(CONFIG_LEDS_TRIGGER_TIMER) += ledtrig-timer.o +--- linux-2.6.15/drivers/leds/leds-ixp4xx-gpio.c 1970-01-01 00:00:00.000000000 +0000 ++++ linux-2.6.15/drivers/leds/leds-ixp4xx-gpio.c 1970-01-01 00:00:00.000000000 +0000 +@@ -0,0 +1,209 @@ ++/* ++ * 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/config.h> ++#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_device ancestor; ++ int flags; ++} ixp4xxgpioled_devices[GPIO_MAX]; ++ ++void ixp4xxgpioled_brightness_set(struct led_device *pled, int 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_device *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, leds_device_suspend); ++} ++ ++static int ixp4xxgpioled_resume(struct platform_device *pdev) ++{ ++ return apply_to_all_leds(pdev, leds_device_resume); ++} ++#endif ++ ++static void ixp4xxgpioled_remove_one_led(struct led_device *pled) { ++ leds_device_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 = leds_device_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 __devinit ixp4xxgpioled_init(void) ++{ ++ return platform_driver_register(&ixp4xxgpioled_driver); ++} ++ ++static void 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("MIT"); +--- linux-2.6.15/include/linux/leds.h 1970-01-01 00:00:00.000000000 +0000 ++++ linux-2.6.15/include/linux/leds.h 1970-01-01 00:00:00.000000000 +0000 +@@ -16,7 +16,7 @@ struct class_device; + * LED Core + */ + struct led_device { +- char *name; ++ const char *name; + int brightness; + int flags; + #define LED_SUSPENDED (1 << 0) |