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drm/panel: use gpiod interface for enable GPIO 

Use the new GPIO descriptor interface to handle the panel's enable GPIO.
This considerably simplifies the code.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
[treding@nvidia.com: rework to improve readability]
Signed-off-by: Thierry Reding <treding@nvidia.com>
hifive-unleashed-5.1
Alexandre Courbot 2014-03-01 14:00:58 +09:00 committed by Thierry Reding
parent ec7c565383
commit cfdf0549f8
1 changed files with 18 additions and 49 deletions
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67
drivers/gpu/drm/panel/panel-simple.c
View File

@ -22,9 +22,8 @@
*/
#include <linux/backlight.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
@ -44,9 +43,6 @@ struct panel_desc {
} size;
};
/* TODO: convert to gpiod_*() API once it's been merged */
#define GPIO_ACTIVE_LOW (1 << 0)
struct panel_simple {
struct drm_panel base;
bool enabled;
@ -57,8 +53,7 @@ struct panel_simple {
struct regulator *supply;
struct i2c_adapter *ddc;
unsigned long enable_gpio_flags;
int enable_gpio;
struct gpio_desc *enable_gpio;
};
static inline struct panel_simple *to_panel_simple(struct drm_panel *panel)
@ -110,12 +105,8 @@ static int panel_simple_disable(struct drm_panel *panel)
backlight_update_status(p->backlight);
}
if (gpio_is_valid(p->enable_gpio)) {
if (p->enable_gpio_flags & GPIO_ACTIVE_LOW)
gpio_set_value(p->enable_gpio, 1);
else
gpio_set_value(p->enable_gpio, 0);
}
if (p->enable_gpio)
gpiod_set_value(p->enable_gpio, 0);
regulator_disable(p->supply);
p->enabled = false;
@ -137,12 +128,8 @@ static int panel_simple_enable(struct drm_panel *panel)
return err;
}
if (gpio_is_valid(p->enable_gpio)) {
if (p->enable_gpio_flags & GPIO_ACTIVE_LOW)
gpio_set_value(p->enable_gpio, 0);
else
gpio_set_value(p->enable_gpio, 1);
}
if (p->enable_gpio)
gpiod_set_value(p->enable_gpio, 1);
if (p->backlight) {
p->backlight->props.power = FB_BLANK_UNBLANK;
@ -185,7 +172,6 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
{
struct device_node *backlight, *ddc;
struct panel_simple *panel;
enum of_gpio_flags flags;
int err;
panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
@ -199,29 +185,20 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
if (IS_ERR(panel->supply))
return PTR_ERR(panel->supply);
panel->enable_gpio = of_get_named_gpio_flags(dev->of_node,
"enable-gpios", 0,
&flags);
if (gpio_is_valid(panel->enable_gpio)) {
unsigned int value;
if (flags & OF_GPIO_ACTIVE_LOW)
panel->enable_gpio_flags |= GPIO_ACTIVE_LOW;
err = gpio_request(panel->enable_gpio, "enable");
if (err < 0) {
dev_err(dev, "failed to request GPIO#%u: %d\n",
panel->enable_gpio, err);
panel->enable_gpio = devm_gpiod_get(dev, "enable");
if (IS_ERR(panel->enable_gpio)) {
err = PTR_ERR(panel->enable_gpio);
if (err != -ENOENT) {
dev_err(dev, "failed to request GPIO: %d\n", err);
return err;
}
value = (panel->enable_gpio_flags & GPIO_ACTIVE_LOW) != 0;
err = gpio_direction_output(panel->enable_gpio, value);
panel->enable_gpio = NULL;
} else {
err = gpiod_direction_output(panel->enable_gpio, 0);
if (err < 0) {
dev_err(dev, "failed to setup GPIO%u: %d\n",
panel->enable_gpio, err);
goto free_gpio;
dev_err(dev, "failed to setup GPIO: %d\n", err);
return err;
}
}
@ -230,10 +207,8 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
panel->backlight = of_find_backlight_by_node(backlight);
of_node_put(backlight);
if (!panel->backlight) {
err = -EPROBE_DEFER;
goto free_gpio;
}
if (!panel->backlight)
return -EPROBE_DEFER;
}
ddc = of_parse_phandle(dev->of_node, "ddc-i2c-bus", 0);
@ -265,9 +240,6 @@ free_ddc:
free_backlight:
if (panel->backlight)
put_device(&panel->backlight->dev);
free_gpio:
if (gpio_is_valid(panel->enable_gpio))
gpio_free(panel->enable_gpio);
return err;
}
@ -287,9 +259,6 @@ static int panel_simple_remove(struct device *dev)
if (panel->backlight)
put_device(&panel->backlight->dev);
if (gpio_is_valid(panel->enable_gpio))
gpio_free(panel->enable_gpio);
regulator_disable(panel->supply);
return 0;