diff options
| author | Philipp Zabel <philipp.zabel@gmail.com> | 2008-05-22 14:20:01 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-07-03 13:25:08 +0100 |
| commit | 85847a360ff5012ed7932bb5bb63566ad584e02f (patch) | |
| tree | f230dbfc1b488cb558786ef77847f602b8eeb6a8 /arch | |
| parent | 43bda1a6d218744382547a2f8be3240d1c3a151b (diff) | |
[ARM] 5045/1: magician: use the pwm_bl driver for the LCD backlight
magician has a GPIO that modifies the brightness level additionally to
the PWM duty value. This patch makes use of the pwm_bl notify callback
to present userspace with a single brightness scale.
This gets rid of the pxa_set_cken calls and direct PWM register access.
Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-pxa/magician.c | 68 |
1 files changed, 44 insertions, 24 deletions
diff --git a/arch/arm/mach-pxa/magician.c b/arch/arm/mach-pxa/magician.c index badba064dc0..300caeb2137 100644 --- a/arch/arm/mach-pxa/magician.c +++ b/arch/arm/mach-pxa/magician.c @@ -25,6 +25,7 @@ #include <linux/mtd/map.h> #include <linux/mtd/physmap.h> #include <linux/pda_power.h> +#include <linux/pwm_backlight.h> #include <asm/gpio.h> #include <asm/hardware.h> @@ -39,6 +40,7 @@ #include <asm/arch/irda.h> #include <asm/arch/ohci.h> +#include "devices.h" #include "generic.h" static unsigned long magician_pin_config[] = { @@ -348,40 +350,58 @@ static struct pxafb_mach_info samsung_info = { * Backlight */ -static void magician_set_bl_intensity(int intensity) +static int magician_backlight_init(struct device *dev) { - if (intensity) { - PWM_CTRL0 = 1; - PWM_PERVAL0 = 0xc8; - if (intensity > 0xc7) { - PWM_PWDUTY0 = intensity - 0x48; - gpio_set_value(EGPIO_MAGICIAN_BL_POWER2, 1); - } else { - PWM_PWDUTY0 = intensity; - gpio_set_value(EGPIO_MAGICIAN_BL_POWER2, 0); - } - gpio_set_value(EGPIO_MAGICIAN_BL_POWER, 1); - pxa_set_cken(CKEN_PWM0, 1); + int ret; + + ret = gpio_request(EGPIO_MAGICIAN_BL_POWER, "BL_POWER"); + if (ret) + goto err; + ret = gpio_request(EGPIO_MAGICIAN_BL_POWER2, "BL_POWER2"); + if (ret) + goto err2; + return 0; + +err2: + gpio_free(EGPIO_MAGICIAN_BL_POWER); +err: + return ret; +} + +static int magician_backlight_notify(int brightness) +{ + gpio_set_value(EGPIO_MAGICIAN_BL_POWER, brightness); + if (brightness >= 200) { + gpio_set_value(EGPIO_MAGICIAN_BL_POWER2, 1); + return brightness - 72; } else { - /* PWM_PWDUTY0 = intensity; */ - gpio_set_value(EGPIO_MAGICIAN_BL_POWER, 0); - pxa_set_cken(CKEN_PWM0, 0); + gpio_set_value(EGPIO_MAGICIAN_BL_POWER2, 0); + return brightness; } } -static struct generic_bl_info backlight_info = { - .default_intensity = 0x64, - .limit_mask = 0x0b, - .max_intensity = 0xc7+0x48, - .set_bl_intensity = magician_set_bl_intensity, +static void magician_backlight_exit(struct device *dev) +{ + gpio_free(EGPIO_MAGICIAN_BL_POWER); + gpio_free(EGPIO_MAGICIAN_BL_POWER2); +} + +static struct platform_pwm_backlight_data backlight_data = { + .pwm_id = 0, + .max_brightness = 272, + .dft_brightness = 100, + .pwm_period_ns = 30923, + .init = magician_backlight_init, + .notify = magician_backlight_notify, + .exit = magician_backlight_exit, }; static struct platform_device backlight = { - .name = "generic-bl", + .name = "pwm-backlight", .dev = { - .platform_data = &backlight_info, + .parent = &pxa27x_device_pwm0.dev, + .platform_data = &backlight_data, }, - .id = -1, }; /* |