diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/video/backlight/pwm_bl.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/video/backlight/pwm_bl.c | 394 |
1 files changed, 0 insertions, 394 deletions
diff --git a/ANDROID_3.4.5/drivers/video/backlight/pwm_bl.c b/ANDROID_3.4.5/drivers/video/backlight/pwm_bl.c deleted file mode 100644 index a8d900d0..00000000 --- a/ANDROID_3.4.5/drivers/video/backlight/pwm_bl.c +++ /dev/null @@ -1,394 +0,0 @@ -/* - * 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. - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/platform_device.h> -#include <linux/fb.h> -#include <linux/backlight.h> -#include <linux/err.h> -#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; - unsigned int invert; - unsigned int period; - unsigned int lth_ns; - unsigned int hth_ns; - int (*notify)(struct device *, - int brightness); - void (*notify_after)(struct device *, - int brightness); - int (*check_fb)(struct device *, struct fb_info *); -}; - -static inline void __pwm0_gpio_setup(void) -{ - /* select pwm function */ - REG8_VAL(GPIO_CTRL_GP20_PWM0_BYTE_ADDR) &= ~0x1; - - /* pwm0 output enable */ - REG8_VAL(GPIO_OD_GP20_PWM0_BYTE_ADDR) &= ~0x01; - - /* share pin */ - 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); - int brightness = bl->props.brightness; - int max = bl->props.max_brightness; - -// if (bl->props.power != FB_BLANK_UNBLANK) -// brightness = 0; -// -// if (bl->props.fb_blank != FB_BLANK_UNBLANK) -// brightness = 0; - - if (pb->notify) - brightness = pb->notify(pb->dev, brightness); - - if (brightness == 0) { - if (pb->invert) { - pwm_config(pb->pwm, pb->period, pb->period); - } else { - pwm_config(pb->pwm, 0, pb->period); - pwm_disable(pb->pwm); - } - } else { - brightness = pb->lth_ns + - (brightness * (pb->period - pb->lth_ns - pb->hth_ns) / max); - if (pb->invert) - brightness = pb->period - brightness; - pwm_config(pb->pwm, brightness, pb->period); - pwm_enable(pb->pwm); - } - - if (pb->notify_after) - pb->notify_after(pb->dev, brightness); - - return 0; -} - -static int pwm_backlight_get_brightness(struct backlight_device *bl) -{ - return bl->props.brightness; -} - -static int pwm_backlight_check_fb(struct backlight_device *bl, - struct fb_info *info) -{ - struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev); - - 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, - .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; - struct platform_pwm_backlight_data *data = pdev->dev.platform_data; - 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; - } - - if (data->init) { - ret = data->init(&pdev->dev); - if (ret < 0) - return ret; - } - - pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL); - if (!pb) { - dev_err(&pdev->dev, "no memory for state\n"); - 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; - //} - } - pb->invert = data->invert; - pb->period = data->pwm_period_ns; - pb->notify = data->notify; - pb->notify_after = data->notify_after; - pb->check_fb = data->check_fb; - pb->lth_ns = data->lth_brightness * (data->pwm_period_ns / data->max_brightness); - pb->hth_ns = (data->max_brightness - data->hth_brightness) * - (data->pwm_period_ns / data->max_brightness); - pb->dev = &pdev->dev; - - pb->pwm = pwm_request(data->pwm_id, "backlight"); - if (IS_ERR(pb->pwm)) { - dev_err(&pdev->dev, "unable to request PWM for backlight\n"); - ret = PTR_ERR(pb->pwm); - goto err_alloc; - } else - dev_dbg(&pdev->dev, "got pwm for backlight\n"); - - memset(&props, 0, sizeof(struct backlight_properties)); - props.type = BACKLIGHT_RAW; - props.max_brightness = data->max_brightness; - bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb, - &pwm_backlight_ops, &props); - if (IS_ERR(bl)) { - dev_err(&pdev->dev, "failed to register backlight\n"); - ret = PTR_ERR(bl); - goto err_bl; - } - - bl->props.brightness = data->dft_brightness; - //backlight_update_status(bl); - - platform_set_drvdata(pdev, bl); - return 0; - -err_bl: - pwm_free(pb->pwm); -err_alloc: - if (data->exit) - data->exit(&pdev->dev); - return ret; -} - -static int pwm_backlight_remove(struct platform_device *pdev) -{ - struct platform_pwm_backlight_data *data = pdev->dev.platform_data; - struct backlight_device *bl = platform_get_drvdata(pdev); - struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev); - - backlight_device_unregister(bl); - pwm_config(pb->pwm, 0, pb->period); - pwm_disable(pb->pwm); - 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->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); - } - return 0; -} - -static SIMPLE_DEV_PM_OPS(pwm_backlight_pm_ops, pwm_backlight_suspend, - pwm_backlight_resume); - -#endif - -static void pwm_backlight_shutdown(struct platform_device *pdev) -{ - pwm_backlight_suspend(&pdev->dev); -} - -static struct platform_driver pwm_backlight_driver = { - .driver = { - .name = "pwm-backlight", - .owner = THIS_MODULE, -#ifdef CONFIG_PM - .pm = &pwm_backlight_pm_ops, -#endif - }, - .probe = pwm_backlight_probe, - .remove = pwm_backlight_remove, - .shutdown = pwm_backlight_shutdown, -}; - -module_platform_driver(pwm_backlight_driver); - -MODULE_DESCRIPTION("PWM based Backlight Driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:pwm-backlight"); - |