Patchwork OMAP:DSS: Enable TV Detection support

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Submitter Nagarajan, Rajkumar
Date June 26, 2010, 11:09 a.m.
Message ID <FF55437E1F14DA4BAEB721A458B6701706BDB39F8D@dbde02.ent.ti.com>
Download mbox | patch
Permalink /patch/108203/
State New, archived
Delegated to: Tomi Valkeinen
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Patch

diff --git a/arch/arm/plat-omap/include/plat/display.h b/arch/arm/plat-omap/include/plat/display.h
index 7842efa..522240b 100644
--- a/arch/arm/plat-omap/include/plat/display.h
+++ b/arch/arm/plat-omap/include/plat/display.h
@@ -464,6 +464,8 @@  struct omap_dss_device {
 
 	enum omap_dss_display_state state;
 
+	u32 (*get_device_state)(struct omap_dss_device *dssdev);
+
 	/* platform specific  */
 	int (*platform_enable)(struct omap_dss_device *dssdev);
 	void (*platform_disable)(struct omap_dss_device *dssdev);
diff --git a/drivers/video/omap2/dss/display.c b/drivers/video/omap2/dss/display.c
index ef8c852..2b937fe 100644
--- a/drivers/video/omap2/dss/display.c
+++ b/drivers/video/omap2/dss/display.c
@@ -278,6 +278,26 @@  static ssize_t display_wss_store(struct device *dev,
 	return size;
 }
 
+static ssize_t device_state_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	unsigned int device_state;
+
+	if (!dssdev->get_device_state)
+		return -ENOENT;
+
+	device_state = dssdev->get_device_state(dssdev);
+
+	return snprintf(buf, PAGE_SIZE, "%u\n", device_state);
+}
+
+static ssize_t device_state_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	return size;
+}
+
 static DEVICE_ATTR(enabled, S_IRUGO|S_IWUSR,
 		display_enabled_show, display_enabled_store);
 static DEVICE_ATTR(update_mode, S_IRUGO|S_IWUSR,
@@ -290,6 +310,8 @@  static DEVICE_ATTR(rotate, S_IRUGO|S_IWUSR,
 		display_rotate_show, display_rotate_store);
 static DEVICE_ATTR(mirror, S_IRUGO|S_IWUSR,
 		display_mirror_show, display_mirror_store);
+static DEVICE_ATTR(device_state, S_IRUGO|S_IWUSR,
+		device_state_show, device_state_store);
 static DEVICE_ATTR(wss, S_IRUGO|S_IWUSR,
 		display_wss_show, display_wss_store);
 
@@ -301,6 +323,7 @@  static struct device_attribute *display_sysfs_attrs[] = {
 	&dev_attr_rotate,
 	&dev_attr_mirror,
 	&dev_attr_wss,
+	&dev_attr_device_state,
 	NULL
 };
 
diff --git a/drivers/video/omap2/dss/venc.c b/drivers/video/omap2/dss/venc.c
index eff3505..3b5093b 100644
--- a/drivers/video/omap2/dss/venc.c
+++ b/drivers/video/omap2/dss/venc.c
@@ -33,12 +33,15 @@ 
 #include <linux/seq_file.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
+#include <linux/gpio.h>
 
 #include <plat/display.h>
 #include <plat/cpu.h>
 
 #include "dss.h"
 
+#define TV_INT_GPIO			33
+#define TV_DETECT_DELAY			40 /*Delay for TV detection logic*/
 #define VENC_BASE	0x48050C00
 
 /* Venc registers */
@@ -612,6 +615,46 @@  static int venc_set_wss(struct omap_dss_device *dssdev,	u32 wss)
 	return 0;
 }
 
+/**
+ * Enables TVDET pulse generation
+ */
+static void venc_enable_tv_detect(void)
+{
+       u32 l;
+
+       l = venc_read_reg(VENC_GEN_CTRL);
+       /* TVDET Active High Setting */
+       l |= FLD_VAL(1, 16, 16);
+       /* Enable TVDET pulse generation */
+       l |= FLD_VAL(1, 0, 0);
+       venc_write_reg(VENC_GEN_CTRL, l);
+}
+
+/**
+ * Disables TVDET pulse generation
+ */
+static void venc_disable_tv_detect(void)
+{
+       u32 l;
+
+       /* Disable TVDET pulse generation */
+       l = venc_read_reg(VENC_GEN_CTRL);
+       l |= FLD_VAL(0, 0, 0);
+       venc_write_reg(VENC_GEN_CTRL, l);
+}
+
+static u32 venc_detect_device(struct omap_dss_device *dssdev)
+{
+       u32 tv_state;
+
+       venc_enable_tv_detect();
+       mdelay(TV_DETECT_DELAY);
+       tv_state = gpio_get_value(TV_INT_GPIO);
+       venc_disable_tv_detect();
+
+       return tv_state;
+}
+
 static struct omap_dss_driver venc_driver = {
 	.probe		= venc_panel_probe,
 	.remove		= venc_panel_remove,
@@ -646,6 +689,7 @@  static struct omap_dss_driver venc_driver = {
 int venc_init(struct platform_device *pdev)
 {
 	u8 rev_id;
+	int ret;
 
 	mutex_init(&venc.venc_lock);
 
@@ -671,7 +715,14 @@  int venc_init(struct platform_device *pdev)
 
 	venc_enable_clocks(0);
 
+	ret = gpio_request(TV_INT_GPIO, "tv_detect");
+	if (ret)
+		pr_err("Failed to get TV_INT_GPIO gpio_33.\n");
+	else
+		gpio_direction_input(TV_INT_GPIO);
+
 	return omap_dss_register_driver(&venc_driver);
+
 }
 
 void venc_exit(void)
@@ -684,6 +735,7 @@  void venc_exit(void)
 int venc_init_display(struct omap_dss_device *dssdev)
 {
 	DSSDBG("init_display\n");
+	dssdev->get_device_state = venc_detect_device;
 
 	return 0;
 }