1 --- a/drivers/leds/Kconfig
2 +++ b/drivers/leds/Kconfig
3 @@ -204,6 +204,13 @@ config LEDS_LP5523
4 Driver provides direct control via LED class and interface for
5 programming the engines.
8 + tristate "LED Support for Memory Latched LEDs"
9 + depends on LEDS_CLASS
14 config LEDS_CLEVO_MAIL
15 tristate "Mail LED on Clevo notebook"
18 +++ b/drivers/leds/leds-latch.c
21 + * LEDs driver for Memory Latched Devices
23 + * Copyright (C) 2008 Gateworks Corp.
24 + * Chris Lang <clang@gateworks.com>
26 + * This program is free software; you can redistribute it and/or modify
27 + * it under the terms of the GNU General Public License version 2 as
28 + * published by the Free Software Foundation.
31 +#include <linux/kernel.h>
32 +#include <linux/slab.h>
33 +#include <linux/init.h>
34 +#include <linux/platform_device.h>
35 +#include <linux/leds.h>
36 +#include <linux/workqueue.h>
38 +#include <linux/spinlock.h>
39 +#include <linux/slab.h>
40 +#include <linux/module.h>
41 +#include <linux/export.h>
43 +static unsigned int mem_keep = 0xFF;
44 +static spinlock_t mem_lock;
45 +static unsigned char *iobase;
47 +struct latch_led_data {
48 + struct led_classdev cdev;
49 + struct work_struct work;
52 + void (*set_led)(u8 bit, enum led_brightness value);
55 +static void latch_set_led(u8 bit, enum led_brightness value)
57 + if (value == LED_OFF)
58 + mem_keep |= (0x1 << bit);
60 + mem_keep &= ~(0x1 << bit);
62 + writeb(mem_keep, iobase);
65 +static void latch_led_set(struct led_classdev *led_cdev,
66 + enum led_brightness value)
68 + struct latch_led_data *led_dat =
69 + container_of(led_cdev, struct latch_led_data, cdev);
71 + raw_spin_lock(mem_lock);
73 + led_dat->set_led(led_dat->bit, value);
75 + raw_spin_unlock(mem_lock);
78 +static int latch_led_probe(struct platform_device *pdev)
80 + struct latch_led_platform_data *pdata = pdev->dev.platform_data;
81 + struct latch_led *cur_led;
82 + struct latch_led_data *leds_data, *led_dat;
88 + leds_data = kzalloc(sizeof(struct latch_led_data) * pdata->num_leds,
93 + for (i = 0; i < pdata->num_leds; i++) {
94 + cur_led = &pdata->leds[i];
95 + led_dat = &leds_data[i];
97 + led_dat->cdev.name = cur_led->name;
98 + led_dat->cdev.default_trigger = cur_led->default_trigger;
99 + led_dat->cdev.brightness_set = latch_led_set;
100 + led_dat->cdev.brightness = LED_OFF;
101 + led_dat->bit = cur_led->bit;
102 + led_dat->set_led = pdata->set_led ? pdata->set_led : latch_set_led;
104 + ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
110 + if (!pdata->set_led) {
111 + iobase = ioremap_nocache(pdata->mem, 0x1000);
112 + writeb(0xFF, iobase);
114 + platform_set_drvdata(pdev, leds_data);
120 + for (i = i - 1; i >= 0; i--) {
121 + led_classdev_unregister(&leds_data[i].cdev);
130 +static int __devexit latch_led_remove(struct platform_device *pdev)
133 + struct latch_led_platform_data *pdata = pdev->dev.platform_data;
134 + struct latch_led_data *leds_data;
136 + leds_data = platform_get_drvdata(pdev);
138 + for (i = 0; i < pdata->num_leds; i++) {
139 + led_classdev_unregister(&leds_data[i].cdev);
140 + cancel_work_sync(&leds_data[i].work);
148 +static struct platform_driver latch_led_driver = {
149 + .probe = latch_led_probe,
150 + .remove = __devexit_p(latch_led_remove),
152 + .name = "leds-latch",
153 + .owner = THIS_MODULE,
157 +static int __init latch_led_init(void)
159 + return platform_driver_register(&latch_led_driver);
162 +static void __exit latch_led_exit(void)
164 + platform_driver_unregister(&latch_led_driver);
167 +module_init(latch_led_init);
168 +module_exit(latch_led_exit);
170 +MODULE_AUTHOR("Chris Lang <clang@gateworks.com>");
171 +MODULE_DESCRIPTION("Latch LED driver");
172 --- a/drivers/leds/Makefile
173 +++ b/drivers/leds/Makefile
174 @@ -22,6 +22,7 @@ obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunf
175 obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
176 obj-$(CONFIG_LEDS_GPIO_REGISTER) += leds-gpio-register.o
177 obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
178 +obj-$(CONFIG_LEDS_LATCH) += leds-latch.o
179 obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
180 obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o
181 obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
182 --- a/include/linux/leds.h
183 +++ b/include/linux/leds.h
184 @@ -210,4 +210,18 @@ struct gpio_led_platform_data {
185 struct platform_device *gpio_led_register_device(
186 int id, const struct gpio_led_platform_data *pdata);
188 +/* For the leds-latch driver */
191 + char *default_trigger;
195 +struct latch_led_platform_data {
198 + struct latch_led *leds;
199 + void (*set_led)(u8 bit, enum led_brightness value);
202 #endif /* __LINUX_LEDS_H_INCLUDED */