1 files changed, 178 insertions, 0 deletions

diff --git a/kernel/drivers/video/backlight/tosa_bl.c b/kernel/drivers/video/backlight/tosa_bl.c
new file mode 100644
index 000000000..3ad676558
--- /dev/null
+++ b/kernel/drivers/video/backlight/tosa_bl.c
@@ -0,0 +1,178 @@
+/*
+ *  LCD / Backlight control code for Sharp SL-6000x (tosa)
+ *
+ *  Copyright (c) 2005		Dirk Opfer
+ *  Copyright (c) 2007,2008	Dmitry Baryshkov
+ *
+ *  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/module.h>
+#include <linux/device.h>
+#include <linux/spi/spi.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/slab.h>
+
+#include <asm/mach/sharpsl_param.h>
+
+#include <mach/tosa.h>
+
+#define COMADJ_DEFAULT	97
+
+#define DAC_CH1		0
+#define DAC_CH2		1
+
+struct tosa_bl_data {
+	struct i2c_client *i2c;
+	struct backlight_device *bl;
+
+	int comadj;
+};
+
+static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness)
+{
+	struct spi_device *spi = dev_get_platdata(&data->i2c->dev);
+
+	i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj);
+
+	/* SetBacklightDuty */
+	i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff));
+
+	/* SetBacklightVR */
+	gpio_set_value(TOSA_GPIO_BL_C20MA, brightness & 0x100);
+
+	tosa_bl_enable(spi, brightness);
+}
+
+static int tosa_bl_update_status(struct backlight_device *dev)
+{
+	struct backlight_properties *props = &dev->props;
+	struct tosa_bl_data *data = bl_get_data(dev);
+	int power = max(props->power, props->fb_blank);
+	int brightness = props->brightness;
+
+	if (power)
+		brightness = 0;
+
+	tosa_bl_set_backlight(data, brightness);
+
+	return 0;
+}
+
+static int tosa_bl_get_brightness(struct backlight_device *dev)
+{
+	struct backlight_properties *props = &dev->props;
+
+	return props->brightness;
+}
+
+static const struct backlight_ops bl_ops = {
+	.get_brightness		= tosa_bl_get_brightness,
+	.update_status		= tosa_bl_update_status,
+};
+
+static int tosa_bl_probe(struct i2c_client *client,
+		const struct i2c_device_id *id)
+{
+	struct backlight_properties props;
+	struct tosa_bl_data *data;
+	int ret = 0;
+
+	data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data),
+				GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
+
+	ret = devm_gpio_request_one(&client->dev, TOSA_GPIO_BL_C20MA,
+				GPIOF_OUT_INIT_LOW, "backlight");
+	if (ret) {
+		dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
+		return ret;
+	}
+
+	i2c_set_clientdata(client, data);
+	data->i2c = client;
+
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.type = BACKLIGHT_RAW;
+	props.max_brightness = 512 - 1;
+	data->bl = devm_backlight_device_register(&client->dev, "tosa-bl",
+						&client->dev, data, &bl_ops,
+						&props);
+	if (IS_ERR(data->bl)) {
+		ret = PTR_ERR(data->bl);
+		goto err_reg;
+	}
+
+	data->bl->props.brightness = 69;
+	data->bl->props.power = FB_BLANK_UNBLANK;
+
+	backlight_update_status(data->bl);
+
+	return 0;
+
+err_reg:
+	data->bl = NULL;
+	return ret;
+}
+
+static int tosa_bl_remove(struct i2c_client *client)
+{
+	struct tosa_bl_data *data = i2c_get_clientdata(client);
+
+	data->bl = NULL;
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tosa_bl_suspend(struct device *dev)
+{
+	struct tosa_bl_data *data = dev_get_drvdata(dev);
+
+	tosa_bl_set_backlight(data, 0);
+
+	return 0;
+}
+
+static int tosa_bl_resume(struct device *dev)
+{
+	struct tosa_bl_data *data = dev_get_drvdata(dev);
+
+	backlight_update_status(data->bl);
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(tosa_bl_pm_ops, tosa_bl_suspend, tosa_bl_resume);
+
+static const struct i2c_device_id tosa_bl_id[] = {
+	{ "tosa-bl", 0 },
+	{ },
+};
+
+static struct i2c_driver tosa_bl_driver = {
+	.driver = {
+		.name		= "tosa-bl",
+		.owner		= THIS_MODULE,
+		.pm		= &tosa_bl_pm_ops,
+	},
+	.probe		= tosa_bl_probe,
+	.remove		= tosa_bl_remove,
+	.id_table	= tosa_bl_id,
+};
+
+module_i2c_driver(tosa_bl_driver);
+
+MODULE_AUTHOR("Dmitry Baryshkov");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
+