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authorLinus Walleij2017-05-30 13:48:21 +0200
committerLee Jones2017-08-07 17:04:32 +0100
commitde7389003ab77fc63296b2adee4cd9c48dc41d5a (patch)
tree0c2235b92ed7abbc373994ab0a94bc0f8a0b3f73 /drivers/video
parent62cdfe658535c39003d4d1b9d7f9b5a23a0db6bf (diff)
backlight: gpio_backlight: Convert to use GPIO descriptor
This driver is predominantly used by device tree systems, all of which can deal with modern GPIO descriptors. The legacy GPIO API is only used by one SH board so make the GPIO descriptor the default way to deal with it. As an intended side effect we do not need to look around in the device tree for the inversion flag since the GPIO descriptors will intrinsically deal with this. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Daniel Thompson <daniel.thompson@linaro.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/backlight/gpio_backlight.c71
1 files changed, 43 insertions, 28 deletions
diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index 18134416b154..5ffaff1e4142 100644
--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c
@@ -9,7 +9,8 @@
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/fb.h>
-#include <linux/gpio.h>
+#include <linux/gpio.h> /* Only for legacy support */
+#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -23,7 +24,7 @@ struct gpio_backlight {
struct device *dev;
struct device *fbdev;
- int gpio;
+ struct gpio_desc *gpiod;
int active;
int def_value;
};
@@ -38,8 +39,8 @@ static int gpio_backlight_update_status(struct backlight_device *bl)
bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
brightness = 0;
- gpio_set_value_cansleep(gbl->gpio,
- brightness ? gbl->active : !gbl->active);
+ gpiod_set_value_cansleep(gbl->gpiod,
+ brightness ? gbl->active : !gbl->active);
return 0;
}
@@ -61,23 +62,27 @@ static const struct backlight_ops gpio_backlight_ops = {
static int gpio_backlight_probe_dt(struct platform_device *pdev,
struct gpio_backlight *gbl)
{
- struct device_node *np = pdev->dev.of_node;
- enum of_gpio_flags gpio_flags;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ enum gpiod_flags flags;
+ int ret;
+
+ gbl->def_value = of_property_read_bool(np, "default-on");
+ flags = gbl->def_value ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
+ /* GPIO descriptors keep track of inversion */
+ gbl->active = 1;
- gbl->gpio = of_get_gpio_flags(np, 0, &gpio_flags);
+ gbl->gpiod = devm_gpiod_get(dev, NULL, flags);
+ if (IS_ERR(gbl->gpiod)) {
+ ret = PTR_ERR(gbl->gpiod);
- if (!gpio_is_valid(gbl->gpio)) {
- if (gbl->gpio != -EPROBE_DEFER) {
- dev_err(&pdev->dev,
+ if (ret != -EPROBE_DEFER) {
+ dev_err(dev,
"Error: The gpios parameter is missing or invalid.\n");
}
- return gbl->gpio;
+ return ret;
}
- gbl->active = (gpio_flags & OF_GPIO_ACTIVE_LOW) ? 0 : 1;
-
- gbl->def_value = of_property_read_bool(np, "default-on");
-
return 0;
}
@@ -89,7 +94,6 @@ static int gpio_backlight_probe(struct platform_device *pdev)
struct backlight_device *bl;
struct gpio_backlight *gbl;
struct device_node *np = pdev->dev.of_node;
- unsigned long flags = GPIOF_DIR_OUT;
int ret;
if (!pdata && !np) {
@@ -109,22 +113,33 @@ static int gpio_backlight_probe(struct platform_device *pdev)
if (ret)
return ret;
} else {
+ /*
+ * Legacy platform data GPIO retrieveal. Do not expand
+ * the use of this code path, currently only used by one
+ * SH board.
+ */
+ unsigned long flags = GPIOF_DIR_OUT;
+
gbl->fbdev = pdata->fbdev;
- gbl->gpio = pdata->gpio;
gbl->active = pdata->active_low ? 0 : 1;
gbl->def_value = pdata->def_value;
- }
-
- if (gbl->active)
- flags |= gbl->def_value ? GPIOF_INIT_HIGH : GPIOF_INIT_LOW;
- else
- flags |= gbl->def_value ? GPIOF_INIT_LOW : GPIOF_INIT_HIGH;
- ret = devm_gpio_request_one(gbl->dev, gbl->gpio, flags,
- pdata ? pdata->name : "backlight");
- if (ret < 0) {
- dev_err(&pdev->dev, "unable to request GPIO\n");
- return ret;
+ if (gbl->active)
+ flags |= gbl->def_value ?
+ GPIOF_INIT_HIGH : GPIOF_INIT_LOW;
+ else
+ flags |= gbl->def_value ?
+ GPIOF_INIT_LOW : GPIOF_INIT_HIGH;
+
+ ret = devm_gpio_request_one(gbl->dev, pdata->gpio, flags,
+ pdata ? pdata->name : "backlight");
+ if (ret < 0) {
+ dev_err(&pdev->dev, "unable to request GPIO\n");
+ return ret;
+ }
+ gbl->gpiod = gpio_to_desc(pdata->gpio);
+ if (!gbl->gpiod)
+ return -EINVAL;
}
memset(&props, 0, sizeof(props));