diff options
author | Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> | 2008-07-24 00:31:48 -0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-24 13:47:41 -0400 |
commit | 3e074058d72486676f6fdf6fe803200c62dcb403 (patch) | |
tree | de9d8c426198e9a10a04593abe8011c1e1822564 /include/linux | |
parent | 2d04a4a72d7e1519b4838f24bdd4b5d0f3f426dc (diff) |
fbdev: LCD backlight driver using Atmel PWM driver
This patch adds a platform driver using the ATMEL PWM driver to control a
backlight which requires a PWM signal and optional GPIO signal for discrete
on/off signal. It has been tested on Favr-32 board from EarthLCD.
The driver is configurable by supplying a struct with the platform data. See
the include/linux/atmel-pwm-bl.h for details.
The board code for Favr-32 will be submitted to the AVR32 kernel list.
Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r-- | include/linux/atmel-pwm-bl.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/include/linux/atmel-pwm-bl.h b/include/linux/atmel-pwm-bl.h new file mode 100644 index 000000000000..0153a47806c2 --- /dev/null +++ b/include/linux/atmel-pwm-bl.h | |||
@@ -0,0 +1,43 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2007 Atmel Corporation | ||
3 | * | ||
4 | * Driver for the AT32AP700X PS/2 controller (PSIF). | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or modify it | ||
7 | * under the terms of the GNU General Public License version 2 as published | ||
8 | * by the Free Software Foundation. | ||
9 | */ | ||
10 | |||
11 | #ifndef __INCLUDE_ATMEL_PWM_BL_H | ||
12 | #define __INCLUDE_ATMEL_PWM_BL_H | ||
13 | |||
14 | /** | ||
15 | * struct atmel_pwm_bl_platform_data | ||
16 | * @pwm_channel: which PWM channel in the PWM module to use. | ||
17 | * @pwm_frequency: PWM frequency to generate, the driver will try to be as | ||
18 | * close as the prescaler allows. | ||
19 | * @pwm_compare_max: value to use in the PWM channel compare register. | ||
20 | * @pwm_duty_max: maximum duty cycle value, must be less than or equal to | ||
21 | * pwm_compare_max. | ||
22 | * @pwm_duty_min: minimum duty cycle value, must be less than pwm_duty_max. | ||
23 | * @pwm_active_low: set to one if the low part of the PWM signal increases the | ||
24 | * brightness of the backlight. | ||
25 | * @gpio_on: GPIO line to control the backlight on/off, set to -1 if not used. | ||
26 | * @on_active_low: set to one if the on/off signal is on when GPIO is low. | ||
27 | * | ||
28 | * This struct must be added to the platform device in the board code. It is | ||
29 | * used by the atmel-pwm-bl driver to setup the GPIO to control on/off and the | ||
30 | * PWM device. | ||
31 | */ | ||
32 | struct atmel_pwm_bl_platform_data { | ||
33 | unsigned int pwm_channel; | ||
34 | unsigned int pwm_frequency; | ||
35 | unsigned int pwm_compare_max; | ||
36 | unsigned int pwm_duty_max; | ||
37 | unsigned int pwm_duty_min; | ||
38 | unsigned int pwm_active_low; | ||
39 | int gpio_on; | ||
40 | unsigned int on_active_low; | ||
41 | }; | ||
42 | |||
43 | #endif /* __INCLUDE_ATMEL_PWM_BL_H */ | ||