diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/video/backlight/wmt_bl.c')
| -rwxr-xr-x | ANDROID_3.4.5/drivers/video/backlight/wmt_bl.c | 191 |
1 files changed, 0 insertions, 191 deletions
diff --git a/ANDROID_3.4.5/drivers/video/backlight/wmt_bl.c b/ANDROID_3.4.5/drivers/video/backlight/wmt_bl.c deleted file mode 100755 index 97087216..00000000 --- a/ANDROID_3.4.5/drivers/video/backlight/wmt_bl.c +++ /dev/null @@ -1,191 +0,0 @@ -/* - * for backlight control on wmt platform, base on pwm_bl.c - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/platform_device.h> -#include <linux/pwm_backlight.h> -#include <linux/delay.h> -#include <linux/gpio.h> -#include <linux/leds.h> - -#include <mach/wmt_env.h> -#include "wmt_bl.h" - -#define LTH_BRIGHTNESS 0 -#define DFT_BRIGHTNESS 180 -#define DFT_PWM0_FREQ 4 /* kHz */ - -static struct { - int gpio; - int active; -} power = { -1, 0, }; - -static int backlight_delay = 0; - -static struct led_trigger *logo_led; -static BLOCKING_NOTIFIER_HEAD(bl_chain_head); - -int register_bl_notifier(struct notifier_block *nb) -{ - return blocking_notifier_chain_register(&bl_chain_head, nb); -} -EXPORT_SYMBOL_GPL(register_bl_notifier); - -int unregister_bl_notifier(struct notifier_block *nb) -{ - return blocking_notifier_chain_unregister(&bl_chain_head, nb); -} -EXPORT_SYMBOL_GPL(unregister_bl_notifier); - -static inline int bl_notifier_call_chain(unsigned long val) -{ - int ret = blocking_notifier_call_chain(&bl_chain_head, val, NULL); - return notifier_to_errno(ret); -} - -static void backlight_on(bool on) -{ - static int old_state = -1; - - if (!gpio_is_valid(power.gpio)) - return; - - if (old_state != on) { - if (old_state == false) { - /* delay 100 ms between 'lcd power on' and 'backlight - * power on' at resume sequence. */ - msleep(100); - /* wmt.backlight.delay */ - msleep(backlight_delay); - } - gpio_direction_output(power.gpio, on ? power.active : !power.active); - led_trigger_event(logo_led, on ? LED_FULL : LED_OFF); - - if (!on) { - /* - * delay 100 ms between 'backlight power off' and 'lcd power off' - * at suspend sequence to avoid to lcd flicker - */ - msleep(100); - } - - old_state = on; - bl_notifier_call_chain(on ? BL_OPEN : BL_CLOSE); - } -} - -static int wmt_bl_notify(struct device *dev, int brightness) -{ - return brightness; -} - -static void wmt_bl_notify_after(struct device *dev, int brightness) -{ - backlight_on(brightness != 0); -} - -#define KHZ2PICOS(hz) (1000000000/(hz)) -static struct platform_pwm_backlight_data wm8880_pwmbl_data = { - .pwm_id = 0, - .invert = 1, - .lth_brightness = LTH_BRIGHTNESS, /* low threshold */ - .hth_brightness = 256, /* high threshold */ - .max_brightness = 256, - .dft_brightness = DFT_BRIGHTNESS, - .pwm_period_ns = KHZ2PICOS(DFT_PWM0_FREQ*1000), /* revisit when clocks are implemented */ - .notify = wmt_bl_notify, - .notify_after = wmt_bl_notify_after, -}; - -struct platform_device wm8880_device_pwmbl = { - .name = "pwm-backlight", - .id = 0, - .dev = { - .platform_data = &wm8880_pwmbl_data, - }, -}; - -static int parse_backlight_param(void) -{ - static char env[] = "wmt.backlight.param"; - struct platform_pwm_backlight_data *pdata = &wm8880_pwmbl_data; - uint8_t buf[64]; - size_t l = sizeof(buf); - int pwm_freq = DFT_PWM0_FREQ; - int rc; - - if (wmt_getsyspara(env, buf, &l)) { - pr_err("please set %s\n", env); - return -EINVAL; - } - - /* wmt.backlight.param - * <pwmid>:<invert>:<gpio>:<active>: - * <lth_brightness>:<hth_brightness>:<pwm0freq>:<dft_brightness> - */ - rc = sscanf(buf, "%d:%d:%d:%d:%d:%d:%d:%d", - &pdata->pwm_id, - &pdata->invert, - &power.gpio, &power.active, - &pdata->lth_brightness, - &pdata->hth_brightness, - &pwm_freq, - &pdata->dft_brightness); - - if ((rc < 4)) { - pr_err("bad env %s %s\n", env, buf); - return -EINVAL; - } - if ((pdata->hth_brightness > pdata->max_brightness) || - (pdata->lth_brightness > pdata->hth_brightness)) - pdata->hth_brightness = pdata->max_brightness; - - pdata->pwm_period_ns = KHZ2PICOS(pwm_freq * 1000); - - pr_info("backlight param: pwm%d(%dkHz), invert %d, brightness %d(%d~%d) ", - pdata->pwm_id, pwm_freq, pdata->invert, pdata->dft_brightness, - pdata->lth_brightness, pdata->hth_brightness); - - if (gpio_is_valid(power.gpio)) { - if (gpio_request(power.gpio, "pwm_bl switch")) { - pr_warning("gpio request %d failed\n", power.gpio); - power.gpio = -1; - } - pr_info("gpio%d (active %d)\n", power.gpio, power.active); - } else - pr_info("no gpio control\n"); - - /* parse wmt.backlight.delay */ - l = sizeof(buf); - if (wmt_getsyspara("wmt.backlight.delay", buf, &l) == 0) { - sscanf(buf, "%d", &backlight_delay); - } - pr_info("backlight delay: %dms\n", backlight_delay); - - return 0; -} - -static int __init wmt_bl_init(void) -{ - int rc; - - rc = parse_backlight_param(); - if (rc) - return rc; - - led_trigger_register_simple("logoled", &logo_led); - - return platform_device_register(&wm8880_device_pwmbl); -} - -static void __exit wmt_bl_exit(void) -{ - led_trigger_unregister_simple(logo_led); - platform_device_unregister(&wm8880_device_pwmbl); -} - -module_init(wmt_bl_init); -module_exit(wmt_bl_exit); - |