On Saturday, November 24, 2012 1:35 AM, Laurent Pinchart wrote
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> drivers/video/backlight/Kconfig | 7 ++
> drivers/video/backlight/Makefile | 1 +
> drivers/video/backlight/gpio_backlight.c | 158 ++++++++++++++++++++++++++++++
> include/video/gpio_backlight.h | 21 ++++
> 4 files changed, 187 insertions(+), 0 deletions(-)
> create mode 100644 drivers/video/backlight/gpio_backlight.c
> create mode 100644 include/video/gpio_backlight.h
[...]
> +static int __devinit gpio_backlight_probe(struct platform_device *pdev)
> +{
> + struct gpio_backlight_platform_data *pdata = pdev->dev.platform_data;
> + struct backlight_properties props;
> + struct backlight_device *bl;
> + struct gpio_backlight *gbl;
> + int ret;
> +
> + gbl = devm_kzalloc(&pdev->dev, sizeof(*gbl), GFP_KERNEL);
> + if (gbl == NULL)
> + return -ENOMEM;
> +
> + gbl->dev = &pdev->dev;
> +
> + if (!pdata) {
> + dev_err(&pdev->dev, "failed to find platform data\n");
> + return -ENODEV;
> + }
> +
> + gbl->fbdev = pdata->fbdev;
> + gbl->gpio = pdata->gpio;
> + gbl->active = pdata->active_low ? 0 : 1;
> +
> + ret = devm_gpio_request_one(gbl->dev, gbl->gpio, GPIOF_DIR_OUT,
> + pdata->name);
Please use GPIOF_INIT flags if you want to turn off GPIO backlight.
If gbl->active is inverted, GPIOF_INIT_HIGH can be used as below:
ret = devm_gpio_request_one(gbl->dev, gbl->gpio,
GPIOF_DIR_OUT | (gbl->active ?
GPIOF_INIT_LOW : GPIOF_INIT_HIGH),
pdata->name);
Best regards,
Jingoo Han
> + if (ret < 0) {
> + dev_err(&pdev->dev, "unable to request GPIO\n");
> + return ret;
> + }
> +
> + memset(&props, 0, sizeof(props));
> + props.type = BACKLIGHT_RAW;
> + props.max_brightness = 1;
> + bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, gbl,
> + &gpio_backlight_ops, &props);
> + if (IS_ERR(bl)) {
> + dev_err(&pdev->dev, "failed to register backlight\n");
> + return PTR_ERR(bl);
> + }
> +
> + bl->props.brightness = pdata->def_value;
> + backlight_update_status(bl);
> +
> + platform_set_drvdata(pdev, bl);
> + return 0;
> +}
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