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path: root/drivers/video/backlight/pwm_bl.c
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Diffstat (limited to 'drivers/video/backlight/pwm_bl.c')
-rw-r--r--drivers/video/backlight/pwm_bl.c201
1 files changed, 33 insertions, 168 deletions
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index a8d900d0..5671093c 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -1,14 +1,21 @@
-/*
- * linux/drivers/video/backlight/pwm_bl.c
- *
- * simple PWM based backlight control, board code has to setup
- * 1) pin configuration so PWM waveforms can output
- * 2) platform_data being correctly configured
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
+/*++
+ linux/drivers/video/backlight/pwm_bl.c
+
+ Copyright (c) 2013 WonderMedia Technologies, Inc.
+
+ This program is free software: you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software Foundation,
+ either version 2 of the License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ You should have received a copy of the GNU General Public License along with
+ this program. If not, see <http://www.gnu.org/licenses/>.
+
+ WonderMedia Technologies, Inc.
+ 10F, 529, Chung-Cheng Road, Hsin-Tien, Taipei 231, R.O.C.
+--*/
#include <linux/module.h>
#include <linux/kernel.h>
@@ -20,18 +27,9 @@
#include <linux/pwm.h>
#include <linux/pwm_backlight.h>
#include <linux/slab.h>
-#include <linux/irq.h>
#include <mach/hardware.h>
-#include <linux/delay.h>
-#include <linux/gpio.h>
-#include <mach/wmt_iomux.h>
-
-int pwm_or_gpio=1;
-extern int wmt_getsyspara(char *varname, unsigned char *varval, int *varlen);
-
-
struct pwm_bl_data {
struct pwm_device *pwm;
struct device *dev;
@@ -58,85 +56,6 @@ static inline void __pwm0_gpio_setup(void)
REG32_VAL(PIN_SHARING_SEL_4BYTE_ADDR) &= ~0x1000;
}
-static int pre_brightness_value;
-void sgm3727_bl_brightness(int brightness_value)
-{
- int i = 0;
- int pulse_num = 0;
- brightness_value= (brightness_value-10)*31/245;
- brightness_value = 31 - brightness_value;
-
- if (brightness_value >= 32)
- {
- brightness_value = 31;
- }
- if (brightness_value < 0)
- {
- brightness_value = 0;
- }
- //printk("%s,brightness_value=%d,%d\n",__FUNCTION__,pre_brightness_value,brightness_value);
- if(pre_brightness_value == brightness_value)
- {
- return;
- }
- else if(pre_brightness_value == 0xFF)
- {
- pulse_num = brightness_value;
- }
- else if(brightness_value>pre_brightness_value)
- {
- pulse_num = brightness_value - pre_brightness_value;
- }
- else
- {
- pulse_num = (brightness_value + 32 ) - pre_brightness_value;
- }
-
- //printk("%s,pulse_num=%d\n",__FUNCTION__,pulse_num);
- if (pulse_num < 32)
- {
- local_irq_disable();
- if(pre_brightness_value == 0xFF)
- {
- gpio_direction_output(WMT_PIN_GP0_GPIO0,0);
- mdelay(5);//5
- gpio_direction_output(WMT_PIN_GP0_GPIO0,1);
- udelay(50);
- }
- for (i=0; i < pulse_num; i++)
- {
- gpio_direction_output(WMT_PIN_GP0_GPIO0,0);
- udelay(10);//50
- gpio_direction_output(WMT_PIN_GP0_GPIO0,1);
- udelay(10);//50
- }
- local_irq_enable();
- }
-
- pre_brightness_value = brightness_value;
-}
-
-static int cw500_backlight_update_status(struct backlight_device *bl)
-{
- struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
- int brightness = bl->props.brightness;
- int max = bl->props.max_brightness;
-
- if(!brightness)
- {
- gpio_direction_output(WMT_PIN_GP0_GPIO0,0);
- pre_brightness_value = 0xFF;
- mdelay(10);
- return;
- }
- else
- {
- sgm3727_bl_brightness(brightness);
- }
-
- return 0;
-}
-
static int pwm_backlight_update_status(struct backlight_device *bl)
{
struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
@@ -187,31 +106,12 @@ static int pwm_backlight_check_fb(struct backlight_device *bl,
return !pb->check_fb || pb->check_fb(pb->dev, info);
}
-backlight_update_status_select(struct backlight_device *bl)
-{
- if(pwm_or_gpio){
- //printk("pwm branch\n");
- pwm_backlight_update_status(bl);
- }else{
- printk("gpio branch\n");
- cw500_backlight_update_status(bl);
- }
-
-}
-
static const struct backlight_ops pwm_backlight_ops = {
- //.update_status = pwm_backlight_update_status,//TODO: add uboot control rubbit
- //.update_status = cw500_backlight_update_status,
- .update_status = backlight_update_status_select,
+ .update_status = pwm_backlight_update_status,
.get_brightness = pwm_backlight_get_brightness,
.check_fb = pwm_backlight_check_fb,
};
-/*
-* wmt.bl_select:
-* 0----->gpio control back light
-* 1----->pwm control back light
-* default pwm control back light
-*/
+
static int pwm_backlight_probe(struct platform_device *pdev)
{
struct backlight_properties props;
@@ -219,18 +119,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
struct backlight_device *bl;
struct pwm_bl_data *pb;
int ret;
- unsigned char buf[64];
- int varlen = sizeof(buf);
- memset(buf, 0x0, sizeof(buf));
- ret = wmt_getsyspara("wmt.bl_select", buf, &varlen);
- if (ret == 0) {
- sscanf(buf, "%d", &pwm_or_gpio);
- }
- else {
- pwm_or_gpio = 1;
- printk("default use pwm to control backlight,pwm_or_gpio:%d\n",pwm_or_gpio);
- }
if (!data) {
dev_err(&pdev->dev, "failed to find platform data\n");
return -EINVAL;
@@ -248,16 +137,9 @@ static int pwm_backlight_probe(struct platform_device *pdev)
ret = -ENOMEM;
goto err_alloc;
}
- if(pwm_or_gpio){
- __pwm0_gpio_setup();
- }else{
- pre_brightness_value = 0;
- //ret = gpio_request(WMT_PIN_GP0_GPIO0,"gpio lcd back light");
- //if (ret){
- // printk("gpio_request gpio lcd back light failed\n");
- // goto err_alloc;
- //}
- }
+
+ __pwm0_gpio_setup();
+
pb->invert = data->invert;
pb->period = data->pwm_period_ns;
pb->notify = data->notify;
@@ -313,53 +195,36 @@ static int pwm_backlight_remove(struct platform_device *pdev)
pwm_free(pb->pwm);
if (data->exit)
data->exit(&pdev->dev);
- if(!pwm_or_gpio)
- gpio_free(WMT_PIN_GP0_GPIO0);
return 0;
}
#ifdef CONFIG_PM
static int pwm_backlight_suspend(struct device *dev)
{
- int ret=0;
struct backlight_device *bl = dev_get_drvdata(dev);
struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
- printk("%s\n",__func__);
+
if (pb->notify)
pb->notify(pb->dev, 0);
- if(pwm_or_gpio){
- if (pb->invert) {
- pwm_config(pb->pwm, pb->period, pb->period);
- } else {
- pwm_config(pb->pwm, 0, pb->period);
- pwm_disable(pb->pwm);
- }
- }else{
+ if (pb->invert) {
+ pwm_config(pb->pwm, pb->period, pb->period);
+ } else {
+ pwm_config(pb->pwm, 0, pb->period);
+ pwm_disable(pb->pwm);
}
if (pb->notify_after)
pb->notify_after(pb->dev, 0);
- if(!pwm_or_gpio){
- gpio_free(WMT_PIN_GP0_GPIO0);
- }
return 0;
}
static int pwm_backlight_resume(struct device *dev)
{
- int ret=0;
- printk("%s\n",__func__);
- if(pwm_or_gpio){
- __pwm0_gpio_setup();
- }else{
- ret = gpio_request(WMT_PIN_GP0_GPIO0,"gpio lcd back light");
- if (ret){
- printk("gpio_request gpio lcd back light failed\n");
- return -1;
- }
- gpio_direction_output(WMT_PIN_GP0_GPIO0,0);
- }
+ //struct backlight_device *bl = dev_get_drvdata(dev);
+ //backlight_update_status(bl);
+
+ __pwm0_gpio_setup();
return 0;
}
generated by cgit (git 2.34.1) at 2024-12-19 12:00:06 +0000