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- --- a/drivers/leds/Kconfig
- +++ b/drivers/leds/Kconfig
- @@ -296,6 +296,12 @@ config LEDS_LP8860
- on the LP8860 4 channel LED driver using the I2C communication
- bus.
-
- +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
- --- a/drivers/leds/Makefile
- +++ b/drivers/leds/Makefile
- @@ -25,6 +25,7 @@ obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunf
- obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
- obj-$(CONFIG_LEDS_GPIO_REGISTER) += leds-gpio-register.o
- obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
- +obj-$(CONFIG_LEDS_LATCH) += leds-latch.o
- obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
- obj-$(CONFIG_LEDS_LP55XX_COMMON) += leds-lp55xx-common.o
- obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o
- --- /dev/null
- +++ b/drivers/leds/leds-latch.c
- @@ -0,0 +1,152 @@
- +/*
- + * 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>
- +#include <linux/module.h>
- +#include <linux/export.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 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 = 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/include/linux/leds.h
- +++ b/include/linux/leds.h
- @@ -385,4 +385,18 @@ static inline void ledtrig_cpu(enum cpu_
- }
- #endif
-
- +/* 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 */
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