[PATCH 01/21] OMAPDSS: panel-dvi: add PD gpio handling

Tomi Valkeinen
2012-03-07T12:45:11Z

The driver for the DVI framer should handle the power-down signal of the
framer, instead of the current way of handling it in the board files.

This patch adds power_down_gpio into the device's platform data, and
adds the necessary code in the driver to request and handle the GPIO.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
drivers/video/omap2/displays/panel-dvi.c | 31 ++++++++++++++++++++++++++++++
include/video/omap-panel-dvi.h | 2 +
2 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/drivers/video/omap2/displays/panel-dvi.c b/drivers/video/omap2/displays/panel-dvi.c
index 03eb14a..876b798 100644
--- a/drivers/video/omap2/displays/panel-dvi.c
+++ b/drivers/video/omap2/displays/panel-dvi.c
@@ -21,6 +21,7 @@
#include <linux/slab.h>
#include <video/omapdss.h>
#include <linux/i2c.h>
+#include <linux/gpio.h>
#include <drm/drm_edid.h>

#include <video/omap-panel-dvi.h>
@@ -44,6 +45,8 @@ struct panel_drv_data {
struct omap_dss_device *dssdev;

struct mutex lock;
+
+ int pd_gpio;
};

static inline struct panel_dvi_platform_data
@@ -54,6 +57,7 @@ static inline struct panel_dvi_platform_data

static int panel_dvi_power_on(struct omap_dss_device *dssdev)
{
+ struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
int r;

@@ -70,6 +74,9 @@ static int panel_dvi_power_on(struct omap_dss_device *dssdev)
goto err1;
}

+ if (gpio_is_valid(ddata->pd_gpio))
+ gpio_set_value(ddata->pd_gpio, 1);
+
return 0;
err1:
omapdss_dpi_display_disable(dssdev);
@@ -79,11 +86,15 @@ err0:

static void panel_dvi_power_off(struct omap_dss_device *dssdev)
{
+ struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);
struct panel_dvi_platform_data *pdata = get_pdata(dssdev);

if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
return;

+ if (gpio_is_valid(ddata->pd_gpio))
+ gpio_set_value(ddata->pd_gpio, 0);
+
if (pdata->platform_disable)
pdata->platform_disable(dssdev);

@@ -92,7 +103,9 @@ static void panel_dvi_power_off(struct omap_dss_device *dssdev)

static int panel_dvi_probe(struct omap_dss_device *dssdev)
{
+ struct panel_dvi_platform_data *pdata = get_pdata(dssdev);
struct panel_drv_data *ddata;
+ int r;

ddata = kzalloc(sizeof(*ddata), GFP_KERNEL);
if (!ddata)
@@ -104,6 +117,21 @@ static int panel_dvi_probe(struct omap_dss_device *dssdev)
ddata->dssdev = dssdev;
mutex_init(&ddata->lock);

+ if (pdata)
+ ddata->pd_gpio = pdata->power_down_gpio;
+ else
+ ddata->pd_gpio = -1;
+
+ if (gpio_is_valid(ddata->pd_gpio)) {
+ r = gpio_request_one(ddata->pd_gpio, GPIOF_OUT_INIT_LOW,
+ "tfp410 pd");
+ if (r) {
+ dev_err(&dssdev->dev, "Failed to request PD GPIO %d\n",
+ ddata->pd_gpio);
+ ddata->pd_gpio = -1;
+ }
+ }
+
dev_set_drvdata(&dssdev->dev, ddata);

return 0;
@@ -115,6 +143,9 @@ static void __exit panel_dvi_remove(struct omap_dss_device *dssdev)

mutex_lock(&ddata->lock);

+ if (gpio_is_valid(ddata->pd_gpio))
+ gpio_free(ddata->pd_gpio);
+
dev_set_drvdata(&dssdev->dev, NULL);

mutex_unlock(&ddata->lock);
diff --git a/include/video/omap-panel-dvi.h b/include/video/omap-panel-dvi.h
index 87ad567b..4ad41fc 100644
--- a/include/video/omap-panel-dvi.h
+++ b/include/video/omap-panel-dvi.h
@@ -27,11 +27,13 @@ struct omap_dss_device;
* @platform_enable: platform specific panel enable function
* @platform_disable: platform specific panel disable function
* @i2c_bus_num: i2c bus id for the panel
+ * @power_down_gpio: gpio number for PD pin (or -1 if not available)
*/
struct panel_dvi_platform_data {
int (*platform_enable)(struct omap_dss_device *dssdev);
void (*platform_disable)(struct omap_dss_device *dssdev);
u16 i2c_bus_num;
+ int power_down_gpio;
};

#endif /* __OMAP_PANEL_DVI_H */
--
1.7.4.1