On 12/5/11, Thomas Abraham <thomas.abraham@xxxxxxxxxx> wrote:
> The power source to the lcd panel or the lcd interface such as lvds
> transmitters could be controlled by a regulator supply. Add support
> for enabling/disabling the regulator when switching power to lcd.
>
> Two new elements 'min_uV' and 'max_uV' in the platform data are added
> to allow platform code to specifiy the desired output voltage from the
> regulator.
>
> Cc: Ben Dooks <ben-linux@xxxxxxxxx>
> Signed-off-by: Thomas Abraham <thomas.abraham@xxxxxxxxxx>
> ---
> drivers/video/backlight/platform_lcd.c | 29 +++++++++++++++++++++++++++++
> include/video/platform_lcd.h | 7 +++++++
> 2 files changed, 36 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/video/backlight/platform_lcd.c
> b/drivers/video/backlight/platform_lcd.c
> index 302330a..ffa8108 100644
> --- a/drivers/video/backlight/platform_lcd.c
> +++ b/drivers/video/backlight/platform_lcd.c
> @@ -17,6 +17,8 @@
> #include <linux/backlight.h>
> #include <linux/lcd.h>
> #include <linux/slab.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/regulator/machine.h>
>
> #include <video/platform_lcd.h>
>
> @@ -44,11 +46,38 @@ static int platform_lcd_get_power(struct lcd_device
> *lcd)
> static int platform_lcd_set_power(struct lcd_device *lcd, int power)
> {
> struct platform_lcd *plcd = to_our_lcd(lcd);
> + struct regulator *lcd_regulator;
> int lcd_power = 1;
>
> if (power == FB_BLANK_POWERDOWN || plcd->suspended)
> lcd_power = 0;
>
> + /*
> + * If power to lcd and/or lcd interface is controlled using a regulator,
> + * enable or disable the regulator based in the power setting.
> + */
> + lcd_regulator = regulator_get(plcd->us, "vcc_lcd");
> + if (IS_ERR(lcd_regulator)) {
> + dev_info(plcd->us, "could not get regulator\n");
> + goto set_power;
> + }
Recent regulator discussion. it should be failed instead fall through
gracefully.
> +
> + if (lcd_power) {
> + if (plcd->pdata->min_uV || plcd->pdata->max_uV)
> + if (regulator_set_voltage(lcd_regulator,
> + plcd->pdata->min_uV, plcd->pdata->max_uV))
> + dev_info(plcd->us,
> + "regulator voltage set failed\n");
Are there case to change the voltage? Doesn't it easy to set the
voltage at board file? I mean don't need to setup at drivers?
Thank you,
Kyungmin Park
> +
> + if (regulator_enable(lcd_regulator))
> + dev_info(plcd->us, "failed to enable regulator\n");
> + } else {
> + regulator_disable(lcd_regulator);
> + }
> +
> + regulator_put(lcd_regulator);
> +
> +set_power:
> plcd->pdata->set_power(plcd->pdata, lcd_power);
> plcd->power = power;
>
> diff --git a/include/video/platform_lcd.h b/include/video/platform_lcd.h
> index ad3bdfe..acd5d21 100644
> --- a/include/video/platform_lcd.h
> +++ b/include/video/platform_lcd.h
> @@ -14,8 +14,15 @@
> struct plat_lcd_data;
> struct fb_info;
>
> +/**
> + * struct plat_lcd_data - platform data for platform_lcd driver.
> + * @min_uV: Minimum required voltage output from the regulator.
> + * @max_uV: Maximum acceptable voltage output from the regulator.
> + */
> struct plat_lcd_data {
> void (*set_power)(struct plat_lcd_data *, unsigned int power);
> int (*match_fb)(struct plat_lcd_data *, struct fb_info *);
> + int min_uV;
> + int max_uV;
> };
>
> --
> 1.6.6.rc2
>
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