backlight: gpio-backlight: Add DT support
Signed-off-by: Denis Carikli <denis@eukrea.com> Acked-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
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@ -0,0 +1,16 @@
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gpio-backlight bindings
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Required properties:
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- compatible: "gpio-backlight"
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- gpios: describes the gpio that is used for enabling/disabling the backlight.
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refer to bindings/gpio/gpio.txt for more details.
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Optional properties:
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- default-on: enable the backlight at boot.
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Example:
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backlight {
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compatible = "gpio-backlight";
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gpios = <&gpio3 4 GPIO_ACTIVE_HIGH>;
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default-on;
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};
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@ -13,6 +13,8 @@
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_data/gpio_backlight.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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@ -23,6 +25,7 @@ struct gpio_backlight {
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int gpio;
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int active;
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int def_value;
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};
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static int gpio_backlight_update_status(struct backlight_device *bl)
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@ -60,6 +63,29 @@ static const struct backlight_ops gpio_backlight_ops = {
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.check_fb = gpio_backlight_check_fb,
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};
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static int gpio_backlight_probe_dt(struct platform_device *pdev,
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struct gpio_backlight *gbl)
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{
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struct device_node *np = pdev->dev.of_node;
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enum of_gpio_flags gpio_flags;
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gbl->gpio = of_get_gpio_flags(np, 0, &gpio_flags);
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if (!gpio_is_valid(gbl->gpio)) {
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if (gbl->gpio != -EPROBE_DEFER) {
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dev_err(&pdev->dev,
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"Error: The gpios parameter is missing or invalid.\n");
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}
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return gbl->gpio;
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}
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gbl->active = (gpio_flags & OF_GPIO_ACTIVE_LOW) ? 0 : 1;
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gbl->def_value = of_property_read_bool(np, "default-on");
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return 0;
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}
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static int gpio_backlight_probe(struct platform_device *pdev)
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{
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struct gpio_backlight_platform_data *pdata =
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@ -67,10 +93,12 @@ static int gpio_backlight_probe(struct platform_device *pdev)
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struct backlight_properties props;
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struct backlight_device *bl;
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struct gpio_backlight *gbl;
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struct device_node *np = pdev->dev.of_node;
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int ret;
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if (!pdata) {
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dev_err(&pdev->dev, "failed to find platform data\n");
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if (!pdata && !np) {
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dev_err(&pdev->dev,
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"failed to find platform data or device tree node.\n");
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return -ENODEV;
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}
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@ -79,14 +107,22 @@ static int gpio_backlight_probe(struct platform_device *pdev)
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return -ENOMEM;
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gbl->dev = &pdev->dev;
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gbl->fbdev = pdata->fbdev;
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gbl->gpio = pdata->gpio;
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gbl->active = pdata->active_low ? 0 : 1;
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if (np) {
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ret = gpio_backlight_probe_dt(pdev, gbl);
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if (ret)
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return ret;
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} else {
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gbl->fbdev = pdata->fbdev;
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gbl->gpio = pdata->gpio;
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gbl->active = pdata->active_low ? 0 : 1;
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gbl->def_value = pdata->def_value;
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}
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ret = devm_gpio_request_one(gbl->dev, gbl->gpio, GPIOF_DIR_OUT |
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(gbl->active ? GPIOF_INIT_LOW
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: GPIOF_INIT_HIGH),
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pdata->name);
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pdata ? pdata->name : "backlight");
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if (ret < 0) {
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dev_err(&pdev->dev, "unable to request GPIO\n");
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return ret;
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@ -103,17 +139,25 @@ static int gpio_backlight_probe(struct platform_device *pdev)
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return PTR_ERR(bl);
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}
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bl->props.brightness = pdata->def_value;
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bl->props.brightness = gbl->def_value;
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backlight_update_status(bl);
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platform_set_drvdata(pdev, bl);
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return 0;
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}
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#ifdef CONFIG_OF
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static struct of_device_id gpio_backlight_of_match[] = {
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{ .compatible = "gpio-backlight" },
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{ /* sentinel */ }
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};
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#endif
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static struct platform_driver gpio_backlight_driver = {
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.driver = {
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.name = "gpio-backlight",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(gpio_backlight_of_match),
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},
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.probe = gpio_backlight_probe,
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};
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