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authorLinus Torvalds <torvalds@linux-foundation.org>2017-09-07 13:55:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-07 13:55:16 -0700
commit75c727155ce1239c1417ba32a48c796de0d762d4 (patch)
treefa73c6fdf72e9fb6b7d3bbe5253b0bfc3a02dfe2 /drivers/video
parent968c61f7da3cf6d58a49587cfe00d899ca72c1ad (diff)
parent2606706e4d7b89ebf13f35895a7dfe00e394e782 (diff)
Merge tag 'backlight-next-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight
Pull backlight updates from Lee Jones: "Fix-ups: - Constification; pwm_bl - Use new GPIO API; gpio_backlight - Remove unused functionality; gpio_backlight Bug Fixes: - Fix artificial MAXREG limit; lm3630a_bl" * tag 'backlight-next-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight: backlight: gpio_backlight: Delete pdata inversion backlight: gpio_backlight: Convert to use GPIO descriptor backlight: pwm_bl: Make of_device_ids const backlight: lm3630a: Bump REG_MAX value to 0x50 instead of 0x1F
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/backlight/gpio_backlight.c62
-rw-r--r--drivers/video/backlight/lm3630a_bl.c5
-rw-r--r--drivers/video/backlight/pwm_bl.c2
3 files changed, 37 insertions, 32 deletions
diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index 18134416b154..e470da95d806 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>
@@ -23,8 +24,7 @@ struct gpio_backlight {
struct device *dev;
struct device *fbdev;
- int gpio;
- int active;
+ struct gpio_desc *gpiod;
int def_value;
};
@@ -38,8 +38,7 @@ 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);
return 0;
}
@@ -61,23 +60,25 @@ 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;
- 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 +90,6 @@ 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 +109,26 @@ 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;
+ 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));
diff --git a/drivers/video/backlight/lm3630a_bl.c b/drivers/video/backlight/lm3630a_bl.c
index 60d6c2ac87aa..2030a6b77a09 100644
--- a/drivers/video/backlight/lm3630a_bl.c
+++ b/drivers/video/backlight/lm3630a_bl.c
@@ -31,7 +31,8 @@
#define REG_FAULT 0x0B
#define REG_PWM_OUTLOW 0x12
#define REG_PWM_OUTHIGH 0x13
-#define REG_MAX 0x1F
+#define REG_FILTER_STRENGTH 0x50
+#define REG_MAX 0x50
#define INT_DEBOUNCE_MSEC 10
struct lm3630a_chip {
@@ -80,7 +81,7 @@ static int lm3630a_chip_init(struct lm3630a_chip *pchip)
usleep_range(1000, 2000);
/* set Filter Strength Register */
- rval = lm3630a_write(pchip, 0x50, 0x03);
+ rval = lm3630a_write(pchip, REG_FILTER_STRENGTH, 0x03);
/* set Cofig. register */
rval |= lm3630a_update(pchip, REG_CONFIG, 0x07, pdata->pwm_ctrl);
/* set boost control */
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 002f1ce22bd0..9bd17682655a 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -178,7 +178,7 @@ static int pwm_backlight_parse_dt(struct device *dev,
return 0;
}
-static struct of_device_id pwm_backlight_of_match[] = {
+static const struct of_device_id pwm_backlight_of_match[] = {
{ .compatible = "pwm-backlight" },
{ }
};