[PATCH 1/2] drm/panel: use gpiod interface for enable GPIO (original) (raw)
Alexandre Courbot acourbot at nvidia.com
Fri Feb 28 21:00:58 PST 2014
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Use the new GPIO descriptor interface to handle the panel's enable GPIO. This considerably simplifies the code.
Signed-off-by: Alexandre Courbot <acourbot at nvidia.com>
drivers/gpu/drm/panel/panel-simple.c | 69 ++++++++++-------------------------- 1 file changed, 18 insertions(+), 51 deletions(-)
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index 94cbf06..d1cabfa 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -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); @@ -199,30 +185,19 @@ 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");
- panel->enable_gpio = devm_gpiod_get(dev, "enable");
- if (!IS_ERR(panel->enable_gpio)) {
err = gpiod_direction_output(panel->enable_gpio, 0); if (err < 0) {
dev_err(dev, "failed to request GPIO#%u: %d\n",panel->enable_gpio, err);
dev_err(dev, "failed to setup enable GPIO: %d\n", err); return err; }
value = (panel->enable_gpio_flags & GPIO_ACTIVE_LOW) != 0;err = gpio_direction_output(panel->enable_gpio, value);if (err < 0) {dev_err(dev, "failed to setup GPIO%u: %d\n",panel->enable_gpio, err);goto free_gpio;}
- } else if (PTR_ERR(panel->enable_gpio) == -ENOENT) {
panel->enable_gpio = NULL;- } else {
err = PTR_ERR(panel->enable_gpio);dev_err(dev, "failed to request enable GPIO: %d\n", err);return err; } backlight = of_parse_phandle(dev->of_node, "backlight", 0);
@@ -230,10 +205,8 @@ 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 +238,6 @@ 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 +257,6 @@ 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;-- 1.9.0
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