misc: clonedev: New device for cloning

A new device for content cloning between drifferent instances of comdev has
been added.

ST-Ericsson Linux next: NA
ST-Ericsson ID: 404691
ST-Ericsson FOSS-OUT ID: Trivial

Change-Id: I8c96bede685fad46ebb51b0217c48164dcad6659
Signed-off-by: Per-Daniel Olsson <per-daniel.olsson@stericsson.com>

Conflicts:

	drivers/video/mcde/display-av8100.c

Signed-off-by: Per-Daniel Olsson <per-daniel.olsson@stericsson.com>
Change-Id: I8c96bede685fad46ebb51b0217c48164dcad6659
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/49977
Reviewed-by: Robert FEKETE <robert.fekete@stericsson.com>

6 files changed, 424 insertions, 2 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index c7c7114859f..0e2c6a34f19 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -479,6 +479,22 @@ config COMPDEV
 	  This driver replaces the use of the framebuffer The device allows
 	  for posting userspace buffers to be used with the overlays.
 
+config CLONEDEV
+	bool "Display cloning device"
+	depends on FB_MCDE && HWMEM && COMPDEV
+	default n
+	help
+	  This driver provides a way to clone content between two compdev
+	  devices.
+
+config CLONEDEV_DEBUG
+	bool "Display cloning device debug"
+	depends on CLONEDEV
+	default n
+	help
+	  This driver provides a way to clone content between two compdev
+	  devices.
+
 config PCH_PHUB
 	tristate "Intel EG20T PCH/LAPIS Semicon IOH(ML7213/ML7223/ML7831) PHUB"
 	depends on PCI
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 6f925aafbd5..570f57e2717 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -48,6 +48,7 @@ obj-y				+= lis3lv02d/
 obj-y				+= carma/
 obj-$(CONFIG_DISPDEV)		+= dispdev/
 obj-$(CONFIG_COMPDEV)		+= compdev/
+obj-$(CONFIG_CLONEDEV)		+= clonedev/
 obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
 obj-$(CONFIG_ALTERA_STAPL)	+=altera-stapl/
 obj-$(CONFIG_MAX8997_MUIC)	+= max8997-muic.o
diff --git a/drivers/misc/clonedev/Makefile b/drivers/misc/clonedev/Makefile
new file mode 100644
index 00000000000..f84859dd3ee
--- /dev/null
+++ b/drivers/misc/clonedev/Makefile
@@ -0,0 +1,5 @@
+obj-$(CONFIG_CLONEDEV) += clonedev.o
+
+ifdef CONFIG_CLONEDEV_DEBUG
+EXTRA_CFLAGS += -DDEBUG
+endif
diff --git a/drivers/misc/clonedev/clonedev.c b/drivers/misc/clonedev/clonedev.c
new file mode 100644
index 00000000000..d3b770fd324
--- /dev/null
+++ b/drivers/misc/clonedev/clonedev.c
@@ -0,0 +1,312 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ *
+ * Device for display cloning on external output.
+ *
+ * Author: Per-Daniel Olsson <per-daniel.olsson@stericsson.com>
+ * for ST-Ericsson.
+ *
+ * License terms: GNU General Public License (GPL), version 2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/miscdevice.h>
+#include <linux/uaccess.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/ioctl.h>
+
+#include <linux/clonedev.h>
+
+#include <linux/compdev.h>
+#include <linux/mm.h>
+#include <video/mcde.h>
+
+static LIST_HEAD(dev_list);
+static DEFINE_MUTEX(dev_list_lock);
+
+struct clonedev {
+	struct mutex lock;
+	struct miscdevice mdev;
+	struct list_head list;
+	bool open;
+	struct compdev *src_compdev;
+	struct compdev *dst_compdev;
+	bool overlay_case;
+	struct compdev_size dst_size;
+	struct compdev_scene_info s_info;
+};
+
+static void best_fit(struct compdev_rect *src_rect,
+		struct compdev_size *dst_size,
+		struct compdev_img *img)
+{
+	/* aspect ratio in 26.6 fixed point */
+	int aspect = 1;
+	int dst_w;
+	int dst_h;
+
+	if (img->rotation == COMPDEV_ROT_90_CCW ||
+			img->rotation == COMPDEV_ROT_270_CCW)
+		aspect = (src_rect->height << 6) / src_rect->width;
+	else
+		aspect = (src_rect->width << 6) / src_rect->height;
+
+	dst_w = aspect * dst_size->height >> 6;
+	dst_h = dst_size->height;
+	img->dst_rect.y = 0;
+
+	if (dst_w > dst_size->width) {
+		/*
+		 * Destination rectangle too wide.
+		 * Clamp to image width. Keep aspect ratio.
+		 */
+		dst_h = (dst_size->width << 6) / aspect;
+		dst_w = dst_size->width;
+	}
+
+	/* center the image */
+	if (dst_w < dst_size->width) {
+		int offset = (dst_size->width - dst_w) / 2;
+		img->dst_rect.x = offset;
+	}
+
+	if (dst_h < dst_size->height) {
+		int offset = (dst_size->height - dst_h) / 2;
+		img->dst_rect.y = offset;
+	}
+
+	img->dst_rect.width = dst_w;
+	img->dst_rect.height = dst_h;
+}
+
+static int clonedev_open(struct inode *inode, struct file *file)
+{
+	struct clonedev *cd = NULL;
+
+	mutex_lock(&dev_list_lock);
+	list_for_each_entry(cd, &dev_list, list)
+		if (cd->mdev.minor == iminor(inode))
+			break;
+
+	if (&cd->list == &dev_list) {
+		mutex_unlock(&dev_list_lock);
+		return -ENODEV;
+	}
+
+	if (cd->open) {
+		mutex_unlock(&dev_list_lock);
+		return -EBUSY;
+	}
+
+	cd->open = true;
+
+	mutex_unlock(&dev_list_lock);
+
+	file->private_data = cd;
+
+	return 0;
+}
+
+static int clonedev_release(struct inode *inode, struct file *file)
+{
+	struct clonedev *cd = NULL;
+
+	mutex_lock(&dev_list_lock);
+	list_for_each_entry(cd, &dev_list, list)
+		if (cd->mdev.minor == iminor(inode))
+			break;
+	mutex_unlock(&dev_list_lock);
+
+	if (&cd->list == &dev_list)
+		return -ENODEV;
+
+	cd->open = false;
+	return 0;
+}
+
+static long clonedev_ioctl(struct file *file,
+		unsigned int cmd,
+		unsigned long arg)
+{
+	int ret;
+	struct clonedev *cd = (struct clonedev *)file->private_data;
+
+	mutex_lock(&cd->lock);
+
+	switch (cmd) {
+	case CLONEDEV_SET_MODE_IOC:
+		/* TODO: Get the user data */
+
+		break;
+
+	default:
+		ret = -ENOSYS;
+	}
+
+	mutex_unlock(&cd->lock);
+
+	return ret;
+}
+
+static const struct file_operations clonedev_fops = {
+	.open = clonedev_open,
+	.release = clonedev_release,
+	.unlocked_ioctl = clonedev_ioctl,
+};
+
+static void init_clonedev(struct clonedev *cd, const char *name)
+{
+	mutex_init(&cd->lock);
+	INIT_LIST_HEAD(&cd->list);
+
+	cd->mdev.minor = MISC_DYNAMIC_MINOR;
+	cd->mdev.name = name;
+	cd->mdev.fops = &clonedev_fops;
+}
+
+static void clonedev_post_buffer_callback(void *data,
+		struct compdev_img *cb_img)
+{
+	struct clonedev *cd = (struct clonedev *)data;
+
+	mutex_lock(&cd->lock);
+
+	if (!cd->overlay_case || (cd->overlay_case &&
+			(cb_img->flags & COMPDEV_OVERLAY_FLAG))) {
+		struct compdev_img img;
+
+		img = *cb_img;
+
+		if (img.flags & COMPDEV_BYPASS_FLAG)
+			img.flags &= ~COMPDEV_BYPASS_FLAG;
+
+		if (cd->overlay_case)
+			img.rotation = cd->s_info.ovly_rotation;
+		else
+			img.rotation = cd->s_info.fb_rotation;
+
+		best_fit(&img.src_rect, &cd->dst_size, &img);
+
+		compdev_post_buffer(cd->dst_compdev, &img);
+	}
+	mutex_unlock(&cd->lock);
+}
+
+static void clonedev_post_scene_info_callback(void *data,
+		struct compdev_scene_info *s_info)
+{
+	struct clonedev *cd = (struct clonedev *)data;
+
+	mutex_lock(&cd->lock);
+	if (s_info->img_count > 1)
+		cd->overlay_case = true;
+	else
+		cd->overlay_case = false;
+
+	cd->s_info = *s_info;
+	cd->s_info.img_count = 1;
+	compdev_post_scene_info(cd->dst_compdev, &cd->s_info);
+	mutex_unlock(&cd->lock);
+}
+
+int clonedev_create(void)
+{
+	int ret;
+	struct clonedev *cd;
+
+	static int counter;
+	char name[10];
+
+	cd = kzalloc(sizeof(struct clonedev), GFP_KERNEL);
+	if (!cd)
+		return -ENOMEM;
+
+	snprintf(name, sizeof(name), "%s%d", CLONEDEV_DEFAULT_DEVICE_PREFIX,
+			counter++);
+	init_clonedev(cd, name);
+
+	ret = misc_register(&cd->mdev);
+	if (ret)
+		goto fail_register_misc;
+	mutex_lock(&dev_list_lock);
+	list_add_tail(&cd->list, &dev_list);
+	mutex_unlock(&dev_list_lock);
+
+	mutex_lock(&cd->lock);
+
+	compdev_get(0, &cd->src_compdev);
+	compdev_get(1, &cd->dst_compdev);
+	compdev_get_size(cd->dst_compdev, &cd->dst_size);
+
+	compdev_register_listener_callbacks(cd->src_compdev, (void *)cd,
+			&clonedev_post_buffer_callback,
+			&clonedev_post_scene_info_callback);
+
+	mutex_unlock(&cd->lock);
+	goto out;
+
+fail_register_misc:
+	kfree(cd);
+out:
+	return ret;
+}
+
+void clonedev_destroy(void)
+{
+	struct clonedev *cd;
+	struct clonedev *tmp;
+
+	mutex_lock(&dev_list_lock);
+	list_for_each_entry_safe(cd, tmp, &dev_list, list) {
+		compdev_put(cd->src_compdev);
+		compdev_put(cd->dst_compdev);
+		compdev_deregister_callbacks(cd->src_compdev);
+		list_del(&cd->list);
+		misc_deregister(&cd->mdev);
+		kfree(cd);
+		break;
+	}
+	mutex_unlock(&dev_list_lock);
+}
+
+static void clonedev_destroy_all(void)
+{
+	struct clonedev *cd;
+	struct clonedev *tmp;
+
+	mutex_lock(&dev_list_lock);
+	list_for_each_entry_safe(cd, tmp, &dev_list, list) {
+		list_del(&cd->list);
+		misc_deregister(&cd->mdev);
+		kfree(cd);
+	}
+	mutex_unlock(&dev_list_lock);
+
+	mutex_destroy(&dev_list_lock);
+}
+
+static int __init clonedev_init(void)
+{
+	pr_info("%s\n", __func__);
+
+	mutex_init(&dev_list_lock);
+
+	return 0;
+}
+module_init(clonedev_init);
+
+static void __exit clonedev_exit(void)
+{
+	clonedev_destroy_all();
+	pr_info("%s\n", __func__);
+}
+module_exit(clonedev_exit);
+
+MODULE_AUTHOR("Per-Daniel Olsson <per-daniel.olsson@stericsson.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Device for display cloning on external output");
+
diff --git a/drivers/video/mcde/display-av8100.c b/drivers/video/mcde/display-av8100.c
index b443f7f1760..70750998824 100644
--- a/drivers/video/mcde/display-av8100.c
+++ b/drivers/video/mcde/display-av8100.c
@@ -17,6 +17,8 @@
 #include <linux/gpio.h>
 #include <linux/io.h>
 #include <linux/slab.h>
+#include <linux/compdev.h>
+#include <linux/clonedev.h>
 
 #include <video/mcde_fb.h>
 #include <video/mcde_display.h>
@@ -199,6 +201,9 @@ static ssize_t store_disponoff(struct device *dev,
 	bool enable = false;
 	u8 cea = 0;
 	u8 vesa_cea_nr = 0;
+#ifdef CONFIG_COMPDEV
+	struct mcde_fb *mfb;
+#endif
 
 	dev_dbg(dev, "%s\n", __func__);
 
@@ -211,7 +216,7 @@ static ssize_t store_disponoff(struct device *dev,
 	vesa_cea_nr = (hex_to_bin(buf[4]) << 4) + hex_to_bin(buf[5]);
 	dev_dbg(dev, "enable:%d cea:%d nr:%d\n", enable, cea, vesa_cea_nr);
 
-	if (enable && !mdev->enabled && mdev->fbi == NULL) {
+	if (enable && !mdev->fbi) {
 		struct display_driver_data *driver_data = dev_get_drvdata(dev);
 		u16 w = mdev->native_x_res;
 		u16 h = mdev->native_y_res, vh;
@@ -226,7 +231,40 @@ static ssize_t store_disponoff(struct device *dev,
 			dev_warn(dev, "fb create failed\n");
 		else
 			driver_data->fbdevname = dev_name(fbi->dev);
-	} else if (!enable && mdev->enabled) {
+
+#ifdef CONFIG_COMPDEV
+		/* TODO need another way for compdev to get actual size */
+		mdev->native_x_res = w;
+		mdev->native_y_res = h;
+
+		mfb = to_mcde_fb(fbi);
+		/* Create a compdev overlay for this display */
+		if (compdev_create(mdev, mfb->ovlys[0], false) < 0) {
+			dev_warn(&mdev->dev,
+				"Failed to create compdev for display %s\n",
+						mdev->name);
+		} else {
+			dev_dbg(&mdev->dev, "compdev created for (%s)\n",
+						mdev->name);
+		}
+#ifdef CONFIG_CLONEDEV
+		if (clonedev_create()) {
+			dev_warn(&mdev->dev,
+				"Failed to create clonedev for display %s\n",
+						mdev->name);
+		} else {
+			dev_dbg(&mdev->dev, "clonedev created for (%s)\n",
+						mdev->name);
+		}
+#endif
+#endif
+	} else if (!enable && mdev->fbi) {
+#ifdef CONFIG_CLONEDEV
+		clonedev_destroy();
+#endif
+#ifdef CONFIG_COMPDEV
+		compdev_destroy(mdev);
+#endif
 		mcde_fb_destroy(mdev);
 	}
 
diff --git a/include/linux/clonedev.h b/include/linux/clonedev.h
new file mode 100644
index 00000000000..575233f07e9
--- /dev/null
+++ b/include/linux/clonedev.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ *
+ * ST-Ericsson Display overlay compositer device driver
+ *
+ * Author: Per-Daniel Olsson <per-daniel.olsson@stericsson.com>
+ * for ST-Ericsson.
+ *
+ * License terms: GNU General Public License (GPL), version 2.
+ */
+
+#ifndef _CLONEDEV_H_
+#define _CLONEDEV_H_
+
+#if !defined(__KERNEL__) && !defined(_KERNEL)
+#include <stdint.h>
+#else
+#include <linux/types.h>
+#include <video/mcde.h>
+#endif
+
+#if defined(__KERNEL__) || defined(_KERNEL)
+#include <linux/mm_types.h>
+#include <linux/bitops.h>
+#else
+#define BIT(nr)			(1UL << (nr))
+#endif
+
+#define CLONEDEV_DEFAULT_DEVICE_PREFIX "clone"
+
+/* Cloning mode */
+enum clonedev_mode {
+	CLONEDEV_CLONE_NONE,
+	CLONEDEV_CLONE_VIDEO_OR_UI,
+	CLONEDEV_CLONE_VIDEO_AND_UI,
+	CLONEDEV_CLONE_VIDEO,
+	CLONEDEV_CLONE_UI,
+};
+
+#define CLONEDEV_SET_MODE_IOC      _IOW('D', 1, __u32*)
+
+#ifdef __KERNEL__
+
+int clonedev_create(void);
+void clonedev_destroy(void);
+
+#endif /* __KERNEL__ */
+
+#endif /* _CLONEDEV_H_ */
+