Hi Jingoo,
On Tuesday 27 November 2012 01:10:36 Jingoo Han wrote:
On Saturday, November 24, 2012 1:35 AM, Laurent Pinchart wrote
quoted
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
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
[...]
quoted
+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);
Good point, thank you. I'll fix that.
quoted
+ 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;
+}
--
Regards,
Laurent Pinchart