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asterisk addon: update to 11.13.1
[people/pmueller/ipfire-2.x.git] / src / patches / kernel / omap / beagle / 0002-backlight-Add-TLC59108-backlight-control-driver.patch
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AF		 1From e989473bea15beef8d480b822a619e7b8fca860c Mon Sep 17 00:00:00 2001
2From: "Manjunathappa, Prakash" <prakash.pm@ti.com>
3Date: Mon, 1 Aug 2011 18:25:11 +0530
4Subject: [PATCH 2/5] backlight: Add TLC59108 backlight control driver
5
6This patch adds support for I2C configurable TLC59108 backlight
7control driver.
8
9Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
10Signed-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
18diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
19index 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
37diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
38index 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
49diff --git a/drivers/video/backlight/tlc59108.c b/drivers/video/backlight/tlc59108.c
50new file mode 100644
51index 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--
2161.7.10.4
217
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