src/patches/kernel/omap/beagle/0002-backlight-Add-TLC59108-backlight-control-driver.patch

   1 From e989473bea15beef8d480b822a619e7b8fca860c Mon Sep 17 00:00:00 2001
   2 From: "Manjunathappa, Prakash" <prakash.pm@ti.com>
   3 Date: Mon, 1 Aug 2011 18:25:11 +0530
   4 Subject: [PATCH 2/5] backlight: Add TLC59108 backlight control driver
   5
   6 This patch adds support for I2C configurable TLC59108 backlight
   7 control driver.
   8
   9 Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
  10 Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
  11 ---
  12  drivers/video/backlight/Kconfig    |    8 ++
  13  drivers/video/backlight/Makefile   |    1 +
  14  drivers/video/backlight/tlc59108.c |  160 ++++++++++++++++++++++++++++++++++++
  15  3 files changed, 169 insertions(+)
  16  create mode 100644 drivers/video/backlight/tlc59108.c
  17
  18 diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
  19 index db10d01..04a2275 100644
  20 --- a/drivers/video/backlight/Kconfig
  21 +++ b/drivers/video/backlight/Kconfig
  22 @@ -418,6 +418,14 @@ config BACKLIGHT_AS3711
  23           If you have an Austrian Microsystems AS3711 say Y to enable the
  24           backlight driver.
  25
  26 +config BACKLIGHT_TLC59108
  27 +       tristate "TLC59108 LCD Backlight Driver"
  28 +       depends on I2C && BACKLIGHT_CLASS_DEVICE
  29 +       default n
  30 +       help
  31 +         If you have an LCD Panel with backlight control via TLC59108,
  32 +         say Y to enable its LCD control driver.
  33 +
  34  endif # BACKLIGHT_CLASS_DEVICE
  35
  36  endif # BACKLIGHT_LCD_SUPPORT
  37 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
  38 index 96c4d62..3687852 100644
  39 --- a/drivers/video/backlight/Makefile
  40 +++ b/drivers/video/backlight/Makefile
  41 @@ -41,6 +41,7 @@ obj-$(CONFIG_BACKLIGHT_LP855X)                += lp855x_bl.o
  42  obj-$(CONFIG_BACKLIGHT_LP8788)         += lp8788_bl.o
  43  obj-$(CONFIG_BACKLIGHT_MAX8925)                += max8925_bl.o
  44  obj-$(CONFIG_BACKLIGHT_OMAP1)          += omap1_bl.o
  45 +obj-$(CONFIG_BACKLIGHT_TLC59108)       += tlc59108.o
  46  obj-$(CONFIG_BACKLIGHT_OT200)          += ot200_bl.o
  47  obj-$(CONFIG_BACKLIGHT_PANDORA)                += pandora_bl.o
  48  obj-$(CONFIG_BACKLIGHT_PCF50633)       += pcf50633-backlight.o
  49 diff --git a/drivers/video/backlight/tlc59108.c b/drivers/video/backlight/tlc59108.c
  50 new file mode 100644
  51 index 0000000..4f4ea34
  52 --- /dev/null
  53 +++ b/drivers/video/backlight/tlc59108.c
  54 @@ -0,0 +1,160 @@
  55 +/*
  56 + * ti81xxhdmi_tlc59108.c
  57 + *
  58 + * Copyright (C) 2011 Texas Instruments
  59 + * Author: Senthil Natarajan
  60 + *
  61 + * tlc59108 HDMI Driver
  62 + *
  63 + * This program is free software; you can redistribute it and/or modify it
  64 + * under the terms of the GNU General Public License version 2 as published by
  65 + * the Free Software Foundation.
  66 + *
  67 + * This program is distributed in the hope that it will be useful, but WITHOUT
  68 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  69 + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  70 + * more details.
  71 + *
  72 + * You should have received a copy of the GNU General Public License along with
  73 + * this program.  If not, see <http://www.gnu.org/licenses/>.
  74 + * History:
  75 + *
  76 + * Senthil Natarajan<senthil.n@ti.com> July 2011 I2C driver for tlc59108
  77 + *                                              backlight control
  78 + */
  79 +
  80 +#include <linux/i2c.h>
  81 +#include <linux/kernel.h>
  82 +#include <linux/module.h>
  83 +#include <linux/backlight.h>
  84 +#include <linux/fb.h>
  85 +
  86 +#define tlc59108_MODULE_NAME   "tlc59108"
  87 +#define TLC59108_MODE1   0x00
  88 +#define TLC59108_PWM2    0x04
  89 +#define TLC59108_LEDOUT0 0x0c
  90 +#define TLC59108_LEDOUT1 0x0d
  91 +#define TLC59108_MAX_BRIGHTNESS 0xFF
  92 +
  93 +struct tlc59108_bl {
  94 +       struct i2c_client *client;
  95 +       struct backlight_device *bl;
  96 +};
  97 +
  98 +static void tlc59108_bl_set_backlight(struct tlc59108_bl *data, int brightness)
  99 +{
 100 +       /* Set Mode1 Register */
 101 +       i2c_smbus_write_byte_data(data->client, TLC59108_MODE1, 0x00);
 102 +
 103 +       /* Set LEDOUT0 Register */
 104 +       i2c_smbus_write_byte_data(data->client, TLC59108_LEDOUT0, 0x21);
 105 +
 106 +       /* Set Backlight Duty Cycle*/
 107 +       i2c_smbus_write_byte_data(data->client, TLC59108_PWM2,
 108 +                                 brightness & 0xff);
 109 +}
 110 +
 111 +static int tlc59108_bl_get_brightness(struct backlight_device *dev)
 112 +{
 113 +       struct backlight_properties *props = &dev->props;
 114 +
 115 +       return props->brightness;
 116 +}
 117 +
 118 +static int tlc59108_bl_update_status(struct backlight_device *dev)
 119 +{
 120 +       struct backlight_properties *props = &dev->props;
 121 +       struct tlc59108_bl *data = dev_get_drvdata(&dev->dev);
 122 +       int brightness = props->brightness;
 123 +
 124 +       tlc59108_bl_set_backlight(data, brightness);
 125 +
 126 +       return 0;
 127 +}
 128 +
 129 +static const struct backlight_ops bl_ops = {
 130 +       .get_brightness         = tlc59108_bl_get_brightness,
 131 +       .update_status          = tlc59108_bl_update_status,
 132 +};
 133 +
 134 +static int tlc59108_probe(struct i2c_client *c, const struct i2c_device_id *id)
 135 +{
 136 +       struct backlight_properties props;
 137 +       struct tlc59108_bl *data = kzalloc(sizeof(struct tlc59108_bl),
 138 +                                          GFP_KERNEL);
 139 +       int ret = 0;
 140 +
 141 +       if (!data)
 142 +               return -ENOMEM;
 143 +
 144 +       i2c_set_clientdata(c, data);
 145 +       data->client = c;
 146 +
 147 +       memset(&props, 0, sizeof(struct backlight_properties));
 148 +       props.max_brightness = TLC59108_MAX_BRIGHTNESS;
 149 +       props.type = BACKLIGHT_RAW;
 150 +       data->bl = backlight_device_register("tlc59108-bl", &c->dev, data,
 151 +                                            &bl_ops, &props);
 152 +       if (IS_ERR(data->bl)) {
 153 +               ret = PTR_ERR(data->bl);
 154 +               goto err_reg;
 155 +       }
 156 +
 157 +       data->bl->props.brightness = TLC59108_MAX_BRIGHTNESS;
 158 +
 159 +       backlight_update_status(data->bl);
 160 +
 161 +       return 0;
 162 +
 163 +err_reg:
 164 +       data->bl = NULL;
 165 +       kfree(data);
 166 +       return ret;
 167 +}
 168 +
 169 +static int tlc59108_remove(struct i2c_client *c)
 170 +{
 171 +       struct tlc59108_bl *data = i2c_get_clientdata(c);
 172 +
 173 +       backlight_device_unregister(data->bl);
 174 +       data->bl = NULL;
 175 +
 176 +       kfree(data);
 177 +
 178 +       return 0;
 179 +}
 180 +
 181 +/* I2C Device ID table */
 182 +static const struct i2c_device_id tlc59108_id[] = {
 183 +       { "tlc59108", 0 },
 184 +       { }
 185 +};
 186 +MODULE_DEVICE_TABLE(i2c, tlc59108_id);
 187 +
 188 +/* I2C driver data */
 189 +static struct i2c_driver tlc59108_driver = {
 190 +       .driver = {
 191 +               .owner = THIS_MODULE,
 192 +               .name = tlc59108_MODULE_NAME,
 193 +       },
 194 +       .probe = tlc59108_probe,
 195 +       .remove = tlc59108_remove,
 196 +       .id_table = tlc59108_id,
 197 +};
 198 +
 199 +static int __init tlc59108_init(void)
 200 +{
 201 +       return i2c_add_driver(&tlc59108_driver);
 202 +}
 203 +
 204 +static void __exit tlc59108_exit(void)
 205 +{
 206 +       i2c_del_driver(&tlc59108_driver);
 207 +}
 208 +
 209 +module_init(tlc59108_init);
 210 +module_exit(tlc59108_exit);
 211 +
 212 +MODULE_DESCRIPTION("LCD/Backlight control for TLC59108");
 213 +MODULE_AUTHOR("Senthil Natarajan <senthil.n@ti.com>");
 214 +MODULE_LICENSE("GPL v2");
 215 --
 216 1.7.10.4
 217