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ef51815c5f
Replace FB_BLANK_ constants with their counterparts from the backlight subsystem. The values are identical, so there's no change in functionality. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Link: https://lore.kernel.org/r/20240624152033.25016-6-tzimmermann@suse.de Signed-off-by: Lee Jones <lee@kernel.org>
124 lines
3.3 KiB
C
124 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* gpio_backlight.c - Simple GPIO-controlled backlight
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*/
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/gpio/consumer.h>
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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/platform_data/gpio_backlight.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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struct gpio_backlight {
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struct device *dev;
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struct gpio_desc *gpiod;
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};
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static int gpio_backlight_update_status(struct backlight_device *bl)
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{
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struct gpio_backlight *gbl = bl_get_data(bl);
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gpiod_set_value_cansleep(gbl->gpiod, backlight_get_brightness(bl));
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return 0;
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}
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static bool gpio_backlight_controls_device(struct backlight_device *bl,
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struct device *display_dev)
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{
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struct gpio_backlight *gbl = bl_get_data(bl);
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return !gbl->dev || gbl->dev == display_dev;
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}
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static const struct backlight_ops gpio_backlight_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = gpio_backlight_update_status,
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.controls_device = gpio_backlight_controls_device,
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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 device *dev = &pdev->dev;
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struct gpio_backlight_platform_data *pdata = dev_get_platdata(dev);
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struct device_node *of_node = dev->of_node;
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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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int ret, init_brightness, def_value;
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gbl = devm_kzalloc(dev, sizeof(*gbl), GFP_KERNEL);
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if (gbl == NULL)
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return -ENOMEM;
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if (pdata)
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gbl->dev = pdata->dev;
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def_value = device_property_read_bool(dev, "default-on");
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gbl->gpiod = devm_gpiod_get(dev, NULL, GPIOD_ASIS);
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if (IS_ERR(gbl->gpiod))
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return dev_err_probe(dev, PTR_ERR(gbl->gpiod),
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"The gpios parameter is missing or invalid\n");
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memset(&props, 0, sizeof(props));
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props.type = BACKLIGHT_RAW;
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props.max_brightness = 1;
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bl = devm_backlight_device_register(dev, dev_name(dev), dev, gbl,
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&gpio_backlight_ops, &props);
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if (IS_ERR(bl)) {
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dev_err(dev, "failed to register backlight\n");
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return PTR_ERR(bl);
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}
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/* Set the initial power state */
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if (!of_node || !of_node->phandle)
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/* Not booted with device tree or no phandle link to the node */
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bl->props.power = def_value ? BACKLIGHT_POWER_ON
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: BACKLIGHT_POWER_OFF;
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else if (gpiod_get_value_cansleep(gbl->gpiod) == 0)
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bl->props.power = BACKLIGHT_POWER_OFF;
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else
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bl->props.power = BACKLIGHT_POWER_ON;
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bl->props.brightness = 1;
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init_brightness = backlight_get_brightness(bl);
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ret = gpiod_direction_output(gbl->gpiod, init_brightness);
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if (ret) {
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dev_err(dev, "failed to set initial brightness\n");
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return ret;
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}
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platform_set_drvdata(pdev, bl);
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return 0;
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}
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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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MODULE_DEVICE_TABLE(of, gpio_backlight_of_match);
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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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.of_match_table = gpio_backlight_of_match,
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},
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.probe = gpio_backlight_probe,
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};
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module_platform_driver(gpio_backlight_driver);
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MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
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MODULE_DESCRIPTION("GPIO-based Backlight Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:gpio-backlight");
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