video: tegra: Added sysfs for dc/smartdimmer

Includes:
1.) Added basic DC sysfs objects.
2.) Sysfs objects and functions for smartdimmer settings.
3.) Register dump access for smartdimmer.
4.) Improvements to the behavior of smartdimmer (now updates
    at the end of vblank instead of the beginning).
5.) Rename v_blank_complete to vblank_complete to keep in
    same effective style as the rest of the code.

Original-Change-Id: I59addcc479880322d49b24d1206009def3c4b392
Reviewed-on: http://git-master/r/29893
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>

Rebase-Id: R3a65726e3644d01b374f9774e966d635234567b4

1 files changed, 121 insertions, 0 deletions

diff --git a/drivers/video/tegra/dc/dc_sysfs.c b/drivers/video/tegra/dc/dc_sysfs.c
new file mode 100644
index 000000000000..dedd8e285c18
--- /dev/null
+++ b/drivers/video/tegra/dc/dc_sysfs.c
@@ -0,0 +1,121 @@
+#include <linux/platform_device.h>
+#include <linux/kernel.h>
+
+#include <mach/dc.h>
+#include <mach/fb.h>
+
+#include "dc_reg.h"
+#include "dc_priv.h"
+#include "nvsd.h"
+
+/****************
+ * Current mode *
+ ****************/
+static ssize_t mode_show(struct device *device,
+	struct device_attribute *attr, char *buf)
+{
+	struct nvhost_device *ndev = to_nvhost_device(device);
+	struct tegra_dc *dc = nvhost_get_drvdata(ndev);
+	struct tegra_dc_mode *m;
+	ssize_t res;
+
+	mutex_lock(&dc->lock);
+	m = &dc->mode;
+	res = snprintf(buf, PAGE_SIZE,
+		"pclk: %d\n"
+		"h_ref_to_sync: %d\n"
+		"v_ref_to_sync: %d\n"
+		"h_sync_width: %d\n"
+		"v_sync_width: %d\n"
+		"h_back_porch: %d\n"
+		"v_back_porch: %d\n"
+		"h_active: %d\n"
+		"v_active: %d\n"
+		"h_front_porch: %d\n"
+		"v_front_porch: %d\n"
+		"stereo_mode: %d\n",
+		m->pclk, m->h_ref_to_sync, m->v_ref_to_sync,
+		m->h_sync_width, m->v_sync_width,
+		m->h_back_porch, m->v_back_porch,
+		m->h_active, m->v_active,
+		m->h_front_porch, m->v_front_porch,
+		m->stereo_mode);
+	mutex_unlock(&dc->lock);
+
+	return res;
+}
+
+static DEVICE_ATTR(mode, S_IRUGO, mode_show, NULL);
+
+/**************
+ * DC Enabled *
+ **************/
+static ssize_t enable_show(struct device *device,
+	struct device_attribute *attr, char *buf)
+{
+	struct nvhost_device *ndev = to_nvhost_device(device);
+	struct tegra_dc *dc = nvhost_get_drvdata(ndev);
+	ssize_t res;
+
+	mutex_lock(&dc->lock);
+	res = snprintf(buf, PAGE_SIZE, "%d\n", dc->enabled);
+	mutex_unlock(&dc->lock);
+	return res;
+}
+
+static ssize_t enable_store(struct device *dev,
+	struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct nvhost_device *ndev = to_nvhost_device(dev);
+	struct tegra_dc *dc = nvhost_get_drvdata(ndev);
+	int enabled;
+
+	enabled = simple_strtoul(buf, NULL, 10);
+
+	if (enabled) {
+		tegra_dc_enable(dc);
+	} else {
+		tegra_dc_disable(dc);
+	}
+
+	return count;
+}
+
+static DEVICE_ATTR(enable, S_IRUGO|S_IWUSR|S_IWGRP, enable_show, enable_store);
+
+/********
+ * Init *
+ ********/
+void tegra_dc_remove_sysfs(struct device *dev)
+{
+	struct nvhost_device *ndev = to_nvhost_device(dev);
+	struct tegra_dc *dc = nvhost_get_drvdata(ndev);
+	struct tegra_dc_sd_settings *sd_settings = dc->out->sd_settings;
+
+	device_remove_file(dev, &dev_attr_mode);
+	device_remove_file(dev, &dev_attr_enable);
+
+	if(sd_settings) {
+		nvsd_remove_sysfs(dev);
+	}
+}
+
+void tegra_dc_create_sysfs(struct device *dev)
+{
+	struct nvhost_device *ndev = to_nvhost_device(dev);
+	struct tegra_dc *dc = nvhost_get_drvdata(ndev);
+	struct tegra_dc_sd_settings *sd_settings = dc->out->sd_settings;
+	int error = 0;
+
+	error |= device_create_file(dev, &dev_attr_mode);
+	error |= device_create_file(dev, &dev_attr_enable);
+
+	if(sd_settings) {
+		error |= nvsd_create_sysfs(dev);
+	}
+
+	if(error) {
+		printk("Failed to create sysfs attributes!\n");
+	}
+}
+