From 9f4af290c74b77e16555858a338feb467a8eedb0 Mon Sep 17 00:00:00 2001
From: "Manjunathappa, Prakash" <prakash.pm@ti.com>
Date: Mon, 1 Aug 2011 18:25:11 +0530
Subject: [PATCH 12/13] backlight: Add TLC59108 backlight control driver

This patch adds support for I2C configurable TLC59108 backlight
control driver.

Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
---
 drivers/video/backlight/Kconfig    |    8 ++
 drivers/video/backlight/Makefile   |    1 +
 drivers/video/backlight/tlc59108.c |  160 ++++++++++++++++++++++++++++++++++++
 3 files changed, 169 insertions(+), 0 deletions(-)
 create mode 100755 drivers/video/backlight/tlc59108.c

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 278aeaa..df9dac7 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -342,6 +342,14 @@ config BACKLIGHT_AAT2870
 	  If you have a AnalogicTech AAT2870 say Y to enable the
 	  backlight driver.
 
+config BACKLIGHT_TLC59108
+	tristate "TLC59108 LCD Backlight Driver"
+	depends on I2C && BACKLIGHT_CLASS_DEVICE
+	default n
+	help
+	  If you have an LCD Panel with backlight control via TLC59108,
+	  say Y to enable its LCD control driver.
+
 endif # BACKLIGHT_CLASS_DEVICE
 
 endif # BACKLIGHT_LCD_SUPPORT
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index fdd1fc4..ba31474 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -39,4 +39,5 @@ obj-$(CONFIG_BACKLIGHT_ADP8870)	+= adp8870_bl.o
 obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
 obj-$(CONFIG_BACKLIGHT_AAT2870) += aat2870_bl.o
+obj-$(CONFIG_BACKLIGHT_TLC59108)	+= tlc59108.o
 
diff --git a/drivers/video/backlight/tlc59108.c b/drivers/video/backlight/tlc59108.c
new file mode 100755
index 0000000..4f4ea34
--- /dev/null
+++ b/drivers/video/backlight/tlc59108.c
@@ -0,0 +1,160 @@
+/*
+ * ti81xxhdmi_tlc59108.c
+ *
+ * Copyright (C) 2011 Texas Instruments
+ * Author: Senthil Natarajan
+ *
+ * tlc59108 HDMI Driver
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ * History:
+ *
+ * Senthil Natarajan<senthil.n@ti.com> July 2011 I2C driver for tlc59108
+ *						 backlight control
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/backlight.h>
+#include <linux/fb.h>
+
+#define tlc59108_MODULE_NAME	"tlc59108"
+#define TLC59108_MODE1   0x00
+#define TLC59108_PWM2    0x04
+#define TLC59108_LEDOUT0 0x0c
+#define TLC59108_LEDOUT1 0x0d
+#define TLC59108_MAX_BRIGHTNESS 0xFF
+
+struct tlc59108_bl {
+	struct i2c_client *client;
+	struct backlight_device *bl;
+};
+
+static void tlc59108_bl_set_backlight(struct tlc59108_bl *data, int brightness)
+{
+	/* Set Mode1 Register */
+	i2c_smbus_write_byte_data(data->client, TLC59108_MODE1, 0x00);
+
+	/* Set LEDOUT0 Register */
+	i2c_smbus_write_byte_data(data->client, TLC59108_LEDOUT0, 0x21);
+
+	/* Set Backlight Duty Cycle*/
+	i2c_smbus_write_byte_data(data->client, TLC59108_PWM2,
+				  brightness & 0xff);
+}
+
+static int tlc59108_bl_get_brightness(struct backlight_device *dev)
+{
+	struct backlight_properties *props = &dev->props;
+
+	return props->brightness;
+}
+
+static int tlc59108_bl_update_status(struct backlight_device *dev)
+{
+	struct backlight_properties *props = &dev->props;
+	struct tlc59108_bl *data = dev_get_drvdata(&dev->dev);
+	int brightness = props->brightness;
+
+	tlc59108_bl_set_backlight(data, brightness);
+
+	return 0;
+}
+
+static const struct backlight_ops bl_ops = {
+	.get_brightness		= tlc59108_bl_get_brightness,
+	.update_status		= tlc59108_bl_update_status,
+};
+
+static int tlc59108_probe(struct i2c_client *c, const struct i2c_device_id *id)
+{
+	struct backlight_properties props;
+	struct tlc59108_bl *data = kzalloc(sizeof(struct tlc59108_bl),
+					   GFP_KERNEL);
+	int ret = 0;
+
+	if (!data)
+		return -ENOMEM;
+
+	i2c_set_clientdata(c, data);
+	data->client = c;
+
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.max_brightness = TLC59108_MAX_BRIGHTNESS;
+	props.type = BACKLIGHT_RAW;
+	data->bl = backlight_device_register("tlc59108-bl", &c->dev, data,
+					     &bl_ops, &props);
+	if (IS_ERR(data->bl)) {
+		ret = PTR_ERR(data->bl);
+		goto err_reg;
+	}
+
+	data->bl->props.brightness = TLC59108_MAX_BRIGHTNESS;
+
+	backlight_update_status(data->bl);
+
+	return 0;
+
+err_reg:
+	data->bl = NULL;
+	kfree(data);
+	return ret;
+}
+
+static int tlc59108_remove(struct i2c_client *c)
+{
+	struct tlc59108_bl *data = i2c_get_clientdata(c);
+
+	backlight_device_unregister(data->bl);
+	data->bl = NULL;
+
+	kfree(data);
+
+	return 0;
+}
+
+/* I2C Device ID table */
+static const struct i2c_device_id tlc59108_id[] = {
+	{ "tlc59108", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tlc59108_id);
+
+/* I2C driver data */
+static struct i2c_driver tlc59108_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = tlc59108_MODULE_NAME,
+	},
+	.probe = tlc59108_probe,
+	.remove = tlc59108_remove,
+	.id_table = tlc59108_id,
+};
+
+static int __init tlc59108_init(void)
+{
+	return i2c_add_driver(&tlc59108_driver);
+}
+
+static void __exit tlc59108_exit(void)
+{
+	i2c_del_driver(&tlc59108_driver);
+}
+
+module_init(tlc59108_init);
+module_exit(tlc59108_exit);
+
+MODULE_DESCRIPTION("LCD/Backlight control for TLC59108");
+MODULE_AUTHOR("Senthil Natarajan <senthil.n@ti.com>");
+MODULE_LICENSE("GPL v2");
-- 
1.7.7.4

