Initial import

1 files changed, 195 insertions, 0 deletions

diff --git a/drivers/leds/leds-lt3593.c b/drivers/leds/leds-lt3593.c
new file mode 100644
index 000000000..9f4112476
--- /dev/null
+++ b/drivers/leds/leds-lt3593.c
@@ -0,0 +1,195 @@
+/*
+ * LEDs driver for LT3593 controllers
+ *
+ * See the datasheet at http://cds.linear.com/docs/Datasheet/3593f.pdf
+ *
+ * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
+ *
+ * Based on leds-gpio.c,
+ *
+ *   Copyright (C) 2007 8D Technologies inc.
+ *   Raphael Assenat <raph@8d.com>
+ *   Copyright (C) 2008 Freescale Semiconductor, Inc.
+ *
+ * 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/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+struct lt3593_led_data {
+	struct led_classdev cdev;
+	unsigned gpio;
+	struct work_struct work;
+	u8 new_level;
+};
+
+static void lt3593_led_work(struct work_struct *work)
+{
+	int pulses;
+	struct lt3593_led_data *led_dat =
+		container_of(work, struct lt3593_led_data, work);
+
+	/*
+	 * The LT3593 resets its internal current level register to the maximum
+	 * level on the first falling edge on the control pin. Each following
+	 * falling edge decreases the current level by 625uA. Up to 32 pulses
+	 * can be sent, so the maximum power reduction is 20mA.
+	 * After a timeout of 128us, the value is taken from the register and
+	 * applied is to the output driver.
+	 */
+
+	if (led_dat->new_level == 0) {
+		gpio_set_value_cansleep(led_dat->gpio, 0);
+		return;
+	}
+
+	pulses = 32 - (led_dat->new_level * 32) / 255;
+
+	if (pulses == 0) {
+		gpio_set_value_cansleep(led_dat->gpio, 0);
+		mdelay(1);
+		gpio_set_value_cansleep(led_dat->gpio, 1);
+		return;
+	}
+
+	gpio_set_value_cansleep(led_dat->gpio, 1);
+
+	while (pulses--) {
+		gpio_set_value_cansleep(led_dat->gpio, 0);
+		udelay(1);
+		gpio_set_value_cansleep(led_dat->gpio, 1);
+		udelay(1);
+	}
+}
+
+static void lt3593_led_set(struct led_classdev *led_cdev,
+	enum led_brightness value)
+{
+	struct lt3593_led_data *led_dat =
+		container_of(led_cdev, struct lt3593_led_data, cdev);
+
+	led_dat->new_level = value;
+	schedule_work(&led_dat->work);
+}
+
+static int create_lt3593_led(const struct gpio_led *template,
+	struct lt3593_led_data *led_dat, struct device *parent)
+{
+	int ret, state;
+
+	/* skip leds on GPIOs that aren't available */
+	if (!gpio_is_valid(template->gpio)) {
+		dev_info(parent, "%s: skipping unavailable LT3593 LED at gpio %d (%s)\n",
+				KBUILD_MODNAME, template->gpio, template->name);
+		return 0;
+	}
+
+	led_dat->cdev.name = template->name;
+	led_dat->cdev.default_trigger = template->default_trigger;
+	led_dat->gpio = template->gpio;
+
+	led_dat->cdev.brightness_set = lt3593_led_set;
+
+	state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
+	led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
+
+	if (!template->retain_state_suspended)
+		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+
+	ret = devm_gpio_request_one(parent, template->gpio, state ?
+				    GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+				    template->name);
+	if (ret < 0)
+		return ret;
+
+	INIT_WORK(&led_dat->work, lt3593_led_work);
+
+	ret = led_classdev_register(parent, &led_dat->cdev);
+	if (ret < 0)
+		return ret;
+
+	dev_info(parent, "%s: registered LT3593 LED '%s' at GPIO %d\n",
+		KBUILD_MODNAME, template->name, template->gpio);
+
+	return 0;
+}
+
+static void delete_lt3593_led(struct lt3593_led_data *led)
+{
+	if (!gpio_is_valid(led->gpio))
+		return;
+
+	led_classdev_unregister(&led->cdev);
+	cancel_work_sync(&led->work);
+}
+
+static int lt3593_led_probe(struct platform_device *pdev)
+{
+	struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct lt3593_led_data *leds_data;
+	int i, ret = 0;
+
+	if (!pdata)
+		return -EBUSY;
+
+	leds_data = devm_kzalloc(&pdev->dev,
+			sizeof(struct lt3593_led_data) * pdata->num_leds,
+			GFP_KERNEL);
+	if (!leds_data)
+		return -ENOMEM;
+
+	for (i = 0; i < pdata->num_leds; i++) {
+		ret = create_lt3593_led(&pdata->leds[i], &leds_data[i],
+				      &pdev->dev);
+		if (ret < 0)
+			goto err;
+	}
+
+	platform_set_drvdata(pdev, leds_data);
+
+	return 0;
+
+err:
+	for (i = i - 1; i >= 0; i--)
+		delete_lt3593_led(&leds_data[i]);
+
+	return ret;
+}
+
+static int lt3593_led_remove(struct platform_device *pdev)
+{
+	int i;
+	struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct lt3593_led_data *leds_data;
+
+	leds_data = platform_get_drvdata(pdev);
+
+	for (i = 0; i < pdata->num_leds; i++)
+		delete_lt3593_led(&leds_data[i]);
+
+	return 0;
+}
+
+static struct platform_driver lt3593_led_driver = {
+	.probe		= lt3593_led_probe,
+	.remove		= lt3593_led_remove,
+	.driver		= {
+		.name	= "leds-lt3593",
+	},
+};
+
+module_platform_driver(lt3593_led_driver);
+
+MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
+MODULE_DESCRIPTION("LED driver for LT3593 controllers");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-lt3593");