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authorPhilipp Zabel <philipp.zabel@gmail.com>2008-05-22 14:20:01 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-07-03 13:25:08 +0100
commit85847a360ff5012ed7932bb5bb63566ad584e02f (patch)
treef230dbfc1b488cb558786ef77847f602b8eeb6a8
parent43bda1a6d218744382547a2f8be3240d1c3a151b (diff)
downloadop-kernel-dev-85847a360ff5012ed7932bb5bb63566ad584e02f.zip
op-kernel-dev-85847a360ff5012ed7932bb5bb63566ad584e02f.tar.gz
[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>
-rw-r--r--arch/arm/mach-pxa/magician.c68
1 files changed, 44 insertions, 24 deletions
diff --git a/arch/arm/mach-pxa/magician.c b/arch/arm/mach-pxa/magician.c
index badba06..300caeb 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,
};
/*
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