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[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>
This commit is contained in:
Philipp Zabel 2008-05-22 14:20:01 +01:00 committed by Russell King
parent 43bda1a6d2
commit 85847a360f
1 changed files with 44 additions and 24 deletions
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68
arch/arm/mach-pxa/magician.c
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@ -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,
};
/*