mirror of
https://git.yoctoproject.org/meta-ti
synced 2026-07-16 22:38:04 +00:00
Koen Kooi
4e18d70247
This patchset is managed in https://github.com/beagleboard/kernel/tree/beagleboard-3.2 by Robert Nelson and myself. Tested on beagleboard-xM/Angstrom Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
216 lines
5.9 KiB
Diff
216 lines
5.9 KiB
Diff
From 9f4af290c74b77e16555858a338feb467a8eedb0 Mon Sep 17 00:00:00 2001
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From: "Manjunathappa, Prakash" <prakash.pm@ti.com>
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Date: Mon, 1 Aug 2011 18:25:11 +0530
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Subject: [PATCH 12/13] backlight: Add TLC59108 backlight control driver
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This patch adds support for I2C configurable TLC59108 backlight
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control driver.
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Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
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Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
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---
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drivers/video/backlight/Kconfig | 8 ++
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drivers/video/backlight/Makefile | 1 +
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drivers/video/backlight/tlc59108.c | 160 ++++++++++++++++++++++++++++++++++++
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3 files changed, 169 insertions(+), 0 deletions(-)
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create mode 100755 drivers/video/backlight/tlc59108.c
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diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
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index 278aeaa..df9dac7 100644
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--- a/drivers/video/backlight/Kconfig
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+++ b/drivers/video/backlight/Kconfig
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@@ -342,6 +342,14 @@ config BACKLIGHT_AAT2870
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If you have a AnalogicTech AAT2870 say Y to enable the
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backlight driver.
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+config BACKLIGHT_TLC59108
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+ tristate "TLC59108 LCD Backlight Driver"
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+ depends on I2C && BACKLIGHT_CLASS_DEVICE
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+ default n
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+ help
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+ If you have an LCD Panel with backlight control via TLC59108,
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+ say Y to enable its LCD control driver.
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+
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endif # BACKLIGHT_CLASS_DEVICE
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endif # BACKLIGHT_LCD_SUPPORT
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diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
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index fdd1fc4..ba31474 100644
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--- a/drivers/video/backlight/Makefile
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+++ b/drivers/video/backlight/Makefile
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@@ -39,4 +39,5 @@ obj-$(CONFIG_BACKLIGHT_ADP8870) += adp8870_bl.o
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obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o
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obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o
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obj-$(CONFIG_BACKLIGHT_AAT2870) += aat2870_bl.o
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+obj-$(CONFIG_BACKLIGHT_TLC59108) += tlc59108.o
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diff --git a/drivers/video/backlight/tlc59108.c b/drivers/video/backlight/tlc59108.c
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new file mode 100755
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index 0000000..4f4ea34
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--- /dev/null
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+++ b/drivers/video/backlight/tlc59108.c
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@@ -0,0 +1,160 @@
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+/*
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+ * ti81xxhdmi_tlc59108.c
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+ *
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+ * Copyright (C) 2011 Texas Instruments
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+ * Author: Senthil Natarajan
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+ *
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+ * tlc59108 HDMI Driver
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published by
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+ * the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but WITHOUT
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+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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+ * more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along with
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+ * this program. If not, see <http://www.gnu.org/licenses/>.
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+ * History:
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+ *
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+ * Senthil Natarajan<senthil.n@ti.com> July 2011 I2C driver for tlc59108
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+ * backlight control
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+ */
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+
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+#include <linux/i2c.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/backlight.h>
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+#include <linux/fb.h>
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+
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+#define tlc59108_MODULE_NAME "tlc59108"
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+#define TLC59108_MODE1 0x00
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+#define TLC59108_PWM2 0x04
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+#define TLC59108_LEDOUT0 0x0c
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+#define TLC59108_LEDOUT1 0x0d
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+#define TLC59108_MAX_BRIGHTNESS 0xFF
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+
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+struct tlc59108_bl {
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+ struct i2c_client *client;
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+ struct backlight_device *bl;
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+};
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+
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+static void tlc59108_bl_set_backlight(struct tlc59108_bl *data, int brightness)
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+{
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+ /* Set Mode1 Register */
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+ i2c_smbus_write_byte_data(data->client, TLC59108_MODE1, 0x00);
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+
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+ /* Set LEDOUT0 Register */
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+ i2c_smbus_write_byte_data(data->client, TLC59108_LEDOUT0, 0x21);
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+
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+ /* Set Backlight Duty Cycle*/
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+ i2c_smbus_write_byte_data(data->client, TLC59108_PWM2,
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+ brightness & 0xff);
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+}
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+
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+static int tlc59108_bl_get_brightness(struct backlight_device *dev)
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+{
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+ struct backlight_properties *props = &dev->props;
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+
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+ return props->brightness;
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+}
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+
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+static int tlc59108_bl_update_status(struct backlight_device *dev)
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+{
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+ struct backlight_properties *props = &dev->props;
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+ struct tlc59108_bl *data = dev_get_drvdata(&dev->dev);
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+ int brightness = props->brightness;
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+
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+ tlc59108_bl_set_backlight(data, brightness);
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+
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+ return 0;
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+}
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+
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+static const struct backlight_ops bl_ops = {
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+ .get_brightness = tlc59108_bl_get_brightness,
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+ .update_status = tlc59108_bl_update_status,
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+};
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+
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+static int tlc59108_probe(struct i2c_client *c, const struct i2c_device_id *id)
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+{
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+ struct backlight_properties props;
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+ struct tlc59108_bl *data = kzalloc(sizeof(struct tlc59108_bl),
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+ GFP_KERNEL);
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+ int ret = 0;
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+
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+ if (!data)
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+ return -ENOMEM;
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+
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+ i2c_set_clientdata(c, data);
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+ data->client = c;
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+
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+ memset(&props, 0, sizeof(struct backlight_properties));
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+ props.max_brightness = TLC59108_MAX_BRIGHTNESS;
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+ props.type = BACKLIGHT_RAW;
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+ data->bl = backlight_device_register("tlc59108-bl", &c->dev, data,
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+ &bl_ops, &props);
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+ if (IS_ERR(data->bl)) {
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+ ret = PTR_ERR(data->bl);
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+ goto err_reg;
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+ }
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+
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+ data->bl->props.brightness = TLC59108_MAX_BRIGHTNESS;
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+
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+ backlight_update_status(data->bl);
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+
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+ return 0;
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+
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+err_reg:
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+ data->bl = NULL;
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+ kfree(data);
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+ return ret;
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+}
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+
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+static int tlc59108_remove(struct i2c_client *c)
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+{
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+ struct tlc59108_bl *data = i2c_get_clientdata(c);
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+
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+ backlight_device_unregister(data->bl);
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+ data->bl = NULL;
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+
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+ kfree(data);
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+
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+ return 0;
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+}
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+
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+/* I2C Device ID table */
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+static const struct i2c_device_id tlc59108_id[] = {
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+ { "tlc59108", 0 },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(i2c, tlc59108_id);
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+
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+/* I2C driver data */
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+static struct i2c_driver tlc59108_driver = {
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+ .driver = {
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+ .owner = THIS_MODULE,
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+ .name = tlc59108_MODULE_NAME,
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+ },
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+ .probe = tlc59108_probe,
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+ .remove = tlc59108_remove,
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+ .id_table = tlc59108_id,
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+};
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+
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+static int __init tlc59108_init(void)
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+{
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+ return i2c_add_driver(&tlc59108_driver);
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+}
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+
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+static void __exit tlc59108_exit(void)
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+{
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+ i2c_del_driver(&tlc59108_driver);
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+}
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+
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+module_init(tlc59108_init);
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+module_exit(tlc59108_exit);
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+
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+MODULE_DESCRIPTION("LCD/Backlight control for TLC59108");
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+MODULE_AUTHOR("Senthil Natarajan <senthil.n@ti.com>");
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+MODULE_LICENSE("GPL v2");
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--
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1.7.7.4
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