--- /dev/null
+--- a/drivers/leds/Kconfig
++++ b/drivers/leds/Kconfig
+@@ -157,6 +157,13 @@ config LEDS_LP3944
+ To compile this driver as a module, choose M here: the
+ module will be called leds-lp3944.
+
++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 && X86 && SERIO_I8042 && DMI
+--- /dev/null
++++ b/drivers/leds/leds-latch.c
+@@ -0,0 +1,149 @@
++/*
++ * 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/init.h>
++#include <linux/platform_device.h>
++#include <linux/leds.h>
++#include <linux/workqueue.h>
++#include <asm/io.h>
++#include <linux/spinlock.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");
++MODULE_LICENSE("GPL");
+--- a/drivers/leds/Makefile
++++ b/drivers/leds/Makefile
+@@ -20,6 +20,7 @@ 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-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
+ obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
+--- a/include/linux/leds.h
++++ b/include/linux/leds.h
+@@ -161,5 +161,19 @@ 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 */
projects / openwrt / staging / chunkeey.git / blobdiff