diff options
Diffstat (limited to 'target/linux/ixp4xx/patches-2.6.38/295-latch_led_driver.patch')
| -rw-r--r-- | target/linux/ixp4xx/patches-2.6.38/295-latch_led_driver.patch | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/target/linux/ixp4xx/patches-2.6.38/295-latch_led_driver.patch b/target/linux/ixp4xx/patches-2.6.38/295-latch_led_driver.patch new file mode 100644 index 0000000000..4d399f75dc --- /dev/null +++ b/target/linux/ixp4xx/patches-2.6.38/295-latch_led_driver.patch @@ -0,0 +1,201 @@ +--- a/drivers/leds/Kconfig ++++ b/drivers/leds/Kconfig +@@ -210,6 +210,13 @@ config LEDS_LP5523 + Driver provides direct control via LED class and interface for + programming the engines. + ++config LEDS_LATCH ++ tristate "LED Support for Memory Latched LEDs" ++ depends on LEDS_CLASS ++ help ++ -- To Do -- ++ ++ + config LEDS_CLEVO_MAIL + tristate "Mail LED on Clevo notebook" + depends on LEDS_CLASS +--- /dev/null ++++ b/drivers/leds/leds-latch.c +@@ -0,0 +1,150 @@ ++/* ++ * LEDs driver for Memory Latched Devices ++ * ++ * Copyright (C) 2008 Gateworks Corp. ++ * Chris Lang <clang@gateworks.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/slab.h> ++#include <linux/init.h> ++#include <linux/platform_device.h> ++#include <linux/leds.h> ++#include <linux/workqueue.h> ++#include <asm/io.h> ++#include <linux/spinlock.h> ++#include <linux/slab.h> ++ ++static unsigned int mem_keep = 0xFF; ++static spinlock_t mem_lock; ++static unsigned char *iobase; ++ ++struct latch_led_data { ++ struct led_classdev cdev; ++ struct work_struct work; ++ u8 new_level; ++ u8 bit; ++ void (*set_led)(u8 bit, enum led_brightness value); ++}; ++ ++static void latch_set_led(u8 bit, enum led_brightness value) ++{ ++ if (value == LED_OFF) ++ mem_keep |= (0x1 << bit); ++ else ++ mem_keep &= ~(0x1 << bit); ++ ++ writeb(mem_keep, iobase); ++} ++ ++static void latch_led_set(struct led_classdev *led_cdev, ++ enum led_brightness value) ++{ ++ struct latch_led_data *led_dat = ++ container_of(led_cdev, struct latch_led_data, cdev); ++ ++ raw_spin_lock(mem_lock); ++ ++ led_dat->set_led(led_dat->bit, value); ++ ++ raw_spin_unlock(mem_lock); ++} ++ ++static int latch_led_probe(struct platform_device *pdev) ++{ ++ struct latch_led_platform_data *pdata = pdev->dev.platform_data; ++ struct latch_led *cur_led; ++ struct latch_led_data *leds_data, *led_dat; ++ int i, ret = 0; ++ ++ if (!pdata) ++ return -EBUSY; ++ ++ leds_data = kzalloc(sizeof(struct latch_led_data) * pdata->num_leds, ++ GFP_KERNEL); ++ if (!leds_data) ++ return -ENOMEM; ++ ++ for (i = 0; i < pdata->num_leds; i++) { ++ cur_led = &pdata->leds[i]; ++ led_dat = &leds_data[i]; ++ ++ led_dat->cdev.name = cur_led->name; ++ led_dat->cdev.default_trigger = cur_led->default_trigger; ++ led_dat->cdev.brightness_set = latch_led_set; ++ led_dat->cdev.brightness = LED_OFF; ++ led_dat->bit = cur_led->bit; ++ led_dat->set_led = pdata->set_led ? pdata->set_led : latch_set_led; ++ ++ ret = led_classdev_register(&pdev->dev, &led_dat->cdev); ++ if (ret < 0) { ++ goto err; ++ } ++ } ++ ++ if (!pdata->set_led) { ++ iobase = ioremap_nocache(pdata->mem, 0x1000); ++ writeb(0xFF, iobase); ++ } ++ platform_set_drvdata(pdev, leds_data); ++ ++ return 0; ++ ++err: ++ if (i > 0) { ++ for (i = i - 1; i >= 0; i--) { ++ led_classdev_unregister(&leds_data[i].cdev); ++ } ++ } ++ ++ kfree(leds_data); ++ ++ return ret; ++} ++ ++static int __devexit latch_led_remove(struct platform_device *pdev) ++{ ++ int i; ++ struct latch_led_platform_data *pdata = pdev->dev.platform_data; ++ struct latch_led_data *leds_data; ++ ++ leds_data = platform_get_drvdata(pdev); ++ ++ for (i = 0; i < pdata->num_leds; i++) { ++ led_classdev_unregister(&leds_data[i].cdev); ++ cancel_work_sync(&leds_data[i].work); ++ } ++ ++ kfree(leds_data); ++ ++ return 0; ++} ++ ++static struct platform_driver latch_led_driver = { ++ .probe = latch_led_probe, ++ .remove = __devexit_p(latch_led_remove), ++ .driver = { ++ .name = "leds-latch", ++ .owner = THIS_MODULE, ++ }, ++}; ++ ++static int __init latch_led_init(void) ++{ ++ return platform_driver_register(&latch_led_driver); ++} ++ ++static void __exit latch_led_exit(void) ++{ ++ platform_driver_unregister(&latch_led_driver); ++} ++ ++module_init(latch_led_init); ++module_exit(latch_led_exit); ++ ++MODULE_AUTHOR("Chris Lang <clang@gateworks.com>"); ++MODULE_DESCRIPTION("Latch LED driver"); +--- a/drivers/leds/Makefile ++++ b/drivers/leds/Makefile +@@ -22,6 +22,7 @@ obj-$(CONFIG_LEDS_COBALT_RAQ) += leds-c + obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunfire.o + obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o + obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o ++obj-$(CONFIG_LEDS_LATCH) += leds-latch.o + obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o + obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o + obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o +--- a/include/linux/leds.h ++++ b/include/linux/leds.h +@@ -204,5 +204,19 @@ struct gpio_led_platform_data { + unsigned long *delay_off); + }; + ++/* For the leds-latch driver */ ++struct latch_led { ++ const char *name; ++ char *default_trigger; ++ unsigned bit; ++}; ++ ++struct latch_led_platform_data { ++ int num_leds; ++ u32 mem; ++ struct latch_led *leds; ++ void (*set_led)(u8 bit, enum led_brightness value); ++}; ++ + + #endif /* __LINUX_LEDS_H_INCLUDED */ |