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202 lines
4.7 KiB
Diff
202 lines
4.7 KiB
Diff
--- a/drivers/leds/Kconfig
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+++ b/drivers/leds/Kconfig
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@@ -296,6 +296,12 @@ config LEDS_LP8860
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on the LP8860 4 channel LED driver using the I2C communication
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bus.
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+config LEDS_LATCH
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+ tristate "LED Support for Memory Latched LEDs"
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+ depends on LEDS_CLASS
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+ help
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+ -- To Do --
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+
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config LEDS_CLEVO_MAIL
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tristate "Mail LED on Clevo notebook"
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depends on LEDS_CLASS
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--- a/drivers/leds/Makefile
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+++ b/drivers/leds/Makefile
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@@ -25,6 +25,7 @@ obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunf
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obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
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obj-$(CONFIG_LEDS_GPIO_REGISTER) += leds-gpio-register.o
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obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
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+obj-$(CONFIG_LEDS_LATCH) += leds-latch.o
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obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
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obj-$(CONFIG_LEDS_LP55XX_COMMON) += leds-lp55xx-common.o
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obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o
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--- /dev/null
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+++ b/drivers/leds/leds-latch.c
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@@ -0,0 +1,152 @@
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+/*
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+ * LEDs driver for Memory Latched Devices
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+ *
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+ * Copyright (C) 2008 Gateworks Corp.
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+ * Chris Lang <clang@gateworks.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ */
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+#include <linux/kernel.h>
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+#include <linux/slab.h>
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+#include <linux/init.h>
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+#include <linux/platform_device.h>
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+#include <linux/leds.h>
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+#include <linux/workqueue.h>
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+#include <asm/io.h>
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+#include <linux/spinlock.h>
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+#include <linux/slab.h>
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+#include <linux/module.h>
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+#include <linux/export.h>
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+
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+static unsigned int mem_keep = 0xFF;
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+static spinlock_t mem_lock;
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+static unsigned char *iobase;
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+
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+struct latch_led_data {
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+ struct led_classdev cdev;
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+ struct work_struct work;
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+ u8 new_level;
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+ u8 bit;
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+ void (*set_led)(u8 bit, enum led_brightness value);
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+};
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+
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+static void latch_set_led(u8 bit, enum led_brightness value)
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+{
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+ if (value == LED_OFF)
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+ mem_keep |= (0x1 << bit);
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+ else
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+ mem_keep &= ~(0x1 << bit);
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+
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+ writeb(mem_keep, iobase);
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+}
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+
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+static void latch_led_set(struct led_classdev *led_cdev,
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+ enum led_brightness value)
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+{
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+ struct latch_led_data *led_dat =
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+ container_of(led_cdev, struct latch_led_data, cdev);
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+
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+ raw_spin_lock(mem_lock);
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+
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+ led_dat->set_led(led_dat->bit, value);
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+
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+ raw_spin_unlock(mem_lock);
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+}
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+
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+static int latch_led_probe(struct platform_device *pdev)
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+{
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+ struct latch_led_platform_data *pdata = pdev->dev.platform_data;
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+ struct latch_led *cur_led;
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+ struct latch_led_data *leds_data, *led_dat;
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+ int i, ret = 0;
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+
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+ if (!pdata)
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+ return -EBUSY;
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+
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+ leds_data = kzalloc(sizeof(struct latch_led_data) * pdata->num_leds,
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+ GFP_KERNEL);
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+ if (!leds_data)
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+ return -ENOMEM;
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+
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+ for (i = 0; i < pdata->num_leds; i++) {
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+ cur_led = &pdata->leds[i];
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+ led_dat = &leds_data[i];
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+
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+ led_dat->cdev.name = cur_led->name;
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+ led_dat->cdev.default_trigger = cur_led->default_trigger;
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+ led_dat->cdev.brightness_set = latch_led_set;
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+ led_dat->cdev.brightness = LED_OFF;
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+ led_dat->bit = cur_led->bit;
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+ led_dat->set_led = pdata->set_led ? pdata->set_led : latch_set_led;
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+
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+ ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
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+ if (ret < 0) {
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+ goto err;
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+ }
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+ }
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+
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+ if (!pdata->set_led) {
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+ iobase = ioremap_nocache(pdata->mem, 0x1000);
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+ writeb(0xFF, iobase);
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+ }
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+ platform_set_drvdata(pdev, leds_data);
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+
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+ return 0;
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+
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+err:
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+ if (i > 0) {
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+ for (i = i - 1; i >= 0; i--) {
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+ led_classdev_unregister(&leds_data[i].cdev);
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+ }
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+ }
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+
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+ kfree(leds_data);
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+
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+ return ret;
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+}
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+
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+static int latch_led_remove(struct platform_device *pdev)
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+{
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+ int i;
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+ struct latch_led_platform_data *pdata = pdev->dev.platform_data;
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+ struct latch_led_data *leds_data;
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+
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+ leds_data = platform_get_drvdata(pdev);
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+
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+ for (i = 0; i < pdata->num_leds; i++) {
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+ led_classdev_unregister(&leds_data[i].cdev);
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+ cancel_work_sync(&leds_data[i].work);
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+ }
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+
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+ kfree(leds_data);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver latch_led_driver = {
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+ .probe = latch_led_probe,
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+ .remove = latch_led_remove,
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+ .driver = {
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+ .name = "leds-latch",
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+static int __init latch_led_init(void)
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+{
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+ return platform_driver_register(&latch_led_driver);
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+}
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+
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+static void __exit latch_led_exit(void)
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+{
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+ platform_driver_unregister(&latch_led_driver);
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+}
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+
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+module_init(latch_led_init);
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+module_exit(latch_led_exit);
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+
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+MODULE_AUTHOR("Chris Lang <clang@gateworks.com>");
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+MODULE_DESCRIPTION("Latch LED driver");
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--- a/include/linux/leds.h
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+++ b/include/linux/leds.h
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@@ -385,4 +385,18 @@ static inline void ledtrig_cpu(enum cpu_
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}
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#endif
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+/* For the leds-latch driver */
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+struct latch_led {
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+ const char *name;
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+ char *default_trigger;
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+ unsigned bit;
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+};
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+
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+struct latch_led_platform_data {
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+ int num_leds;
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+ u32 mem;
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+ struct latch_led *leds;
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+ void (*set_led)(u8 bit, enum led_brightness value);
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+};
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+
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#endif /* __LINUX_LEDS_H_INCLUDED */
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