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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 */
|
