recipes-kernel: add MOST driver kernel modules

This commit adds the recipes-kernel directory to the meta-agl-demo
layer. It is needed to add the MOST driver to the AGL layer and have
it compiled as out-of-tree modules.

Change-Id: I38174a2f9a59b0424cfaf2f85f059550422f58f2
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>

4 files changed, 988 insertions, 0 deletions

diff --git a/recipes-kernel/aim-v4l2/aim-v4l2.bb b/recipes-kernel/aim-v4l2/aim-v4l2.bb
new file mode 100644
index 000000000..597e1af82
--- /dev/null
+++ b/recipes-kernel/aim-v4l2/aim-v4l2.bb
@@ -0,0 +1,21 @@
+DESCRIPTION = "Example of how to build an external Linux kernel module"
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://COPYING;md5=12f884d2ae1ff87c09e5b7ccc2c4ca7e \
+		    file://video.c;md5=9c5e932b69bc0074cf2a62f7977ad3dc \ 
+		   "
+
+inherit module
+
+PR = "r0"
+PV = "0.1"
+
+SRC_URI = "file://Makefile \
+	   file://../../mostcore/files/mostcore.h \
+	   file://video.c \
+	   file://COPYING \
+	  "
+
+S = "${WORKDIR}"
+
+# The inherit of module.bbclass will automatically name module packages with
+# "kernel-module-" prefix as required by the oe-core build environment.
diff --git a/recipes-kernel/aim-v4l2/files/COPYING b/recipes-kernel/aim-v4l2/files/COPYING
new file mode 100644
index 000000000..6d45519c8
--- /dev/null
+++ b/recipes-kernel/aim-v4l2/files/COPYING
@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
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diff --git a/recipes-kernel/aim-v4l2/files/Makefile b/recipes-kernel/aim-v4l2/files/Makefile
new file mode 100644
index 000000000..4bf1be7fd
--- /dev/null
+++ b/recipes-kernel/aim-v4l2/files/Makefile
@@ -0,0 +1,18 @@
+# Makefile
+#
+
+SRC := $(shell pwd)
+
+obj-m += aim_v4l2.o
+aim_v4l2-y := video.o
+CFLAGS_video.o := -Idrivers/media/video -I$(src)/../../mostcore/files/
+
+all:
+	$(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules
+
+modules_install:
+	$(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules_install
+
+clean:
+	$(MAKE) -C $(KERNEL_SRC) M=$(SRC) clean
+
diff --git a/recipes-kernel/aim-v4l2/files/video.c b/recipes-kernel/aim-v4l2/files/video.c
new file mode 100644
index 000000000..13abf7c27
--- /dev/null
+++ b/recipes-kernel/aim-v4l2/files/video.c
@@ -0,0 +1,609 @@
+/*
+ * V4L2 AIM - V4L2 Application Interface Module for MostCore
+ *
+ * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file is licensed under GPLv2.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/suspend.h>
+#include <linux/videodev2.h>
+#include <linux/mutex.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-fh.h>
+
+#include "mostcore.h"
+
+#define V4L2_AIM_MAX_INPUT  1
+
+static struct most_aim aim_info;
+
+struct most_video_dev {
+	struct most_interface *iface;
+	int ch_idx;
+	struct list_head list;
+	bool mute;
+
+	struct list_head pending_mbos;
+	spinlock_t list_lock;
+
+	struct v4l2_device v4l2_dev;
+	atomic_t access_ref;
+	struct video_device *vdev;
+	unsigned int ctrl_input;
+
+	struct mutex lock;
+
+	wait_queue_head_t wait_data;
+};
+
+struct aim_fh {
+	/* must be the first field of this struct! */
+	struct v4l2_fh fh;
+	struct most_video_dev *mdev;
+	u32 offs;
+};
+
+static struct list_head video_devices = LIST_HEAD_INIT(video_devices);
+static struct spinlock list_lock;
+
+static inline bool data_ready(struct most_video_dev *mdev)
+{
+	return !list_empty(&mdev->pending_mbos);
+}
+
+static inline struct mbo *get_top_mbo(struct most_video_dev *mdev)
+{
+	return list_first_entry(&mdev->pending_mbos, struct mbo, list);
+}
+
+static int aim_vdev_open(struct file *filp)
+{
+	int ret;
+	struct video_device *vdev = video_devdata(filp);
+	struct most_video_dev *mdev = video_drvdata(filp);
+	struct aim_fh *fh;
+
+	pr_info("aim_vdev_open()\n");
+
+	switch (vdev->vfl_type) {
+	case VFL_TYPE_GRABBER:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	fh = kzalloc(sizeof(*fh), GFP_KERNEL);
+	if (!fh)
+		return -ENOMEM;
+
+	if (!atomic_inc_and_test(&mdev->access_ref)) {
+		pr_err("too many clients\n");
+		ret = -EBUSY;
+		goto err_dec;
+	}
+
+	fh->mdev = mdev;
+	v4l2_fh_init(&fh->fh, vdev);
+	filp->private_data = fh;
+
+	v4l2_fh_add(&fh->fh);
+
+	ret = most_start_channel(mdev->iface, mdev->ch_idx, &aim_info);
+	if (ret) {
+		pr_err("most_start_channel() failed\n");
+		goto err_rm;
+	}
+
+	return 0;
+
+err_rm:
+	v4l2_fh_del(&fh->fh);
+	v4l2_fh_exit(&fh->fh);
+
+err_dec:
+	atomic_dec(&mdev->access_ref);
+	kfree(fh);
+	return ret;
+}
+
+static int aim_vdev_close(struct file *filp)
+{
+	struct aim_fh *fh = filp->private_data;
+	struct most_video_dev *mdev = fh->mdev;
+	struct mbo *mbo, *tmp;
+
+	pr_info("aim_vdev_close()\n");
+
+	/*
+	 * We need to put MBOs back before we call most_stop_channel()
+	 * to deallocate MBOs.
+	 * From the other hand mostcore still calling rx_completion()
+	 * to deliver MBOs until most_stop_channel() is called.
+	 * Use mute to work around this issue.
+	 * This must be implemented in core.
+	 */
+
+	spin_lock(&mdev->list_lock);
+	mdev->mute = true;
+	list_for_each_entry_safe(mbo, tmp, &mdev->pending_mbos, list) {
+		list_del(&mbo->list);
+		spin_unlock(&mdev->list_lock);
+		most_put_mbo(mbo);
+		spin_lock(&mdev->list_lock);
+	}
+	spin_unlock(&mdev->list_lock);
+	most_stop_channel(mdev->iface, mdev->ch_idx, &aim_info);
+	mdev->mute = false;
+
+	v4l2_fh_del(&fh->fh);
+	v4l2_fh_exit(&fh->fh);
+
+	atomic_dec(&mdev->access_ref);
+	kfree(fh);
+	return 0;
+}
+
+static ssize_t aim_vdev_read(struct file *filp, char __user *buf,
+			     size_t count, loff_t *pos)
+{
+	struct aim_fh *fh = filp->private_data;
+	struct most_video_dev *mdev = fh->mdev;
+	int ret = 0;
+
+	if (*pos)
+		return -ESPIPE;
+
+	if (!mdev)
+		return -ENODEV;
+
+	/* wait for the first buffer */
+	if (!(filp->f_flags & O_NONBLOCK)) {
+		if (wait_event_interruptible(mdev->wait_data, data_ready(mdev)))
+			return -ERESTARTSYS;
+	}
+
+	if (!data_ready(mdev))
+		return -EAGAIN;
+
+	while (count > 0 && data_ready(mdev)) {
+		struct mbo *const mbo = get_top_mbo(mdev);
+		int const rem = mbo->processed_length - fh->offs;
+		int const cnt = rem < count ? rem : count;
+
+		if (copy_to_user(buf, mbo->virt_address + fh->offs, cnt)) {
+			pr_err("read: copy_to_user failed\n");
+			if (!ret)
+				ret = -EFAULT;
+			return ret;
+		}
+
+		fh->offs += cnt;
+		count -= cnt;
+		buf += cnt;
+		ret += cnt;
+
+		if (cnt >= rem) {
+			fh->offs = 0;
+			spin_lock(&mdev->list_lock);
+			list_del(&mbo->list);
+			spin_unlock(&mdev->list_lock);
+			most_put_mbo(mbo);
+		}
+	}
+	return ret;
+}
+
+static unsigned int aim_vdev_poll(struct file *filp, poll_table *wait)
+{
+	struct aim_fh *fh = filp->private_data;
+	struct most_video_dev *mdev = fh->mdev;
+	unsigned int mask = 0;
+
+	/* only wait if no data is available */
+	if (!data_ready(mdev))
+		poll_wait(filp, &mdev->wait_data, wait);
+	if (data_ready(mdev))
+		mask |= POLLIN | POLLRDNORM;
+
+	return mask;
+}
+
+static void aim_set_format_struct(struct v4l2_format *f)
+{
+	f->fmt.pix.width = 8;
+	f->fmt.pix.height = 8;
+	f->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG;
+	f->fmt.pix.bytesperline = 0;
+	f->fmt.pix.sizeimage = 188 * 2;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
+	f->fmt.pix.field = V4L2_FIELD_NONE;
+	f->fmt.pix.priv = 0;
+}
+
+static int aim_set_format(struct most_video_dev *mdev, unsigned int cmd,
+			  struct v4l2_format *format)
+{
+	if (format->fmt.pix.pixelformat != V4L2_PIX_FMT_MPEG)
+		return -EINVAL;
+
+	if (cmd == VIDIOC_TRY_FMT)
+		return 0;
+
+	aim_set_format_struct(format);
+
+	return 0;
+}
+
+static int vidioc_querycap(struct file *file, void  *priv,
+			   struct v4l2_capability *cap)
+{
+	struct aim_fh *fh = priv;
+	struct most_video_dev *mdev = fh->mdev;
+
+	pr_info("vidioc_querycap()\n");
+
+	strlcpy(cap->driver, "v4l2_most_aim", sizeof(cap->driver));
+	strlcpy(cap->card, "my_card", sizeof(cap->card));
+	snprintf(cap->bus_info, sizeof(cap->bus_info),
+		 "%s", mdev->iface->description);
+
+	cap->capabilities =
+		V4L2_CAP_READWRITE |
+		V4L2_CAP_TUNER |
+		V4L2_CAP_VIDEO_CAPTURE;
+	return 0;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
+				   struct v4l2_fmtdesc *f)
+{
+	pr_info("vidioc_enum_fmt_vid_cap() %d\n", f->index);
+
+	if (f->index)
+		return -EINVAL;
+
+	strcpy(f->description, "MPEG");
+	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	f->flags = V4L2_FMT_FLAG_COMPRESSED;
+	f->pixelformat = V4L2_PIX_FMT_MPEG;
+
+	return 0;
+}
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+				struct v4l2_format *f)
+{
+	pr_info("vidioc_g_fmt_vid_cap()\n");
+
+	aim_set_format_struct(f);
+	return 0;
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+				  struct v4l2_format *f)
+{
+	struct aim_fh *fh  = priv;
+	struct most_video_dev *mdev = fh->mdev;
+
+	return aim_set_format(mdev, VIDIOC_TRY_FMT, f);
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+				struct v4l2_format *f)
+{
+	struct aim_fh *fh  = priv;
+	struct most_video_dev *mdev = fh->mdev;
+
+	return aim_set_format(mdev, VIDIOC_S_FMT, f);
+}
+
+static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
+{
+	pr_info("vidioc_g_std()\n");
+
+	*norm = V4L2_STD_UNKNOWN;
+	return 0;
+}
+
+static int vidioc_enum_input(struct file *file, void *priv,
+			     struct v4l2_input *input)
+{
+	struct aim_fh *fh = priv;
+	struct most_video_dev *mdev = fh->mdev;
+
+	if (input->index >= V4L2_AIM_MAX_INPUT)
+		return -EINVAL;
+
+	strcpy(input->name, "MOST Video");
+	input->type |= V4L2_INPUT_TYPE_CAMERA;
+	input->audioset = 0;
+
+	input->std = mdev->vdev->tvnorms;
+
+	return 0;
+}
+
+static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
+{
+	struct aim_fh *fh = priv;
+	struct most_video_dev *mdev = fh->mdev;
+	*i = mdev->ctrl_input;
+	return 0;
+}
+
+static int vidioc_s_input(struct file *file, void *priv, unsigned int index)
+{
+	struct aim_fh *fh = priv;
+	struct most_video_dev *mdev = fh->mdev;
+
+	pr_info("vidioc_s_input(%d)\n", index);
+
+	if (index >= V4L2_AIM_MAX_INPUT)
+		return -EINVAL;
+	mdev->ctrl_input = index;
+	return 0;
+}
+
+static struct v4l2_file_operations aim_fops = {
+	.owner      = THIS_MODULE,
+	.open       = aim_vdev_open,
+	.release    = aim_vdev_close,
+	.read       = aim_vdev_read,
+	.poll       = aim_vdev_poll,
+	.unlocked_ioctl = video_ioctl2,
+};
+
+static const struct v4l2_ioctl_ops video_ioctl_ops = {
+	.vidioc_querycap            = vidioc_querycap,
+	.vidioc_enum_fmt_vid_cap    = vidioc_enum_fmt_vid_cap,
+	.vidioc_g_fmt_vid_cap       = vidioc_g_fmt_vid_cap,
+	.vidioc_try_fmt_vid_cap     = vidioc_try_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap       = vidioc_s_fmt_vid_cap,
+	.vidioc_g_std               = vidioc_g_std,
+	.vidioc_enum_input          = vidioc_enum_input,
+	.vidioc_g_input             = vidioc_g_input,
+	.vidioc_s_input             = vidioc_s_input,
+};
+
+static const struct video_device aim_videodev_template = {
+	.fops = &aim_fops,
+	.release = video_device_release,
+	.ioctl_ops = &video_ioctl_ops,
+	.tvnorms = V4L2_STD_UNKNOWN,
+};
+
+/**************************************************************************/
+
+static struct most_video_dev *get_aim_dev(
+	struct most_interface *iface, int channel_idx)
+{
+	struct most_video_dev *mdev, *tmp;
+
+	spin_lock(&list_lock);
+	list_for_each_entry_safe(mdev, tmp, &video_devices, list) {
+		if (mdev->iface == iface && mdev->ch_idx == channel_idx) {
+			spin_unlock(&list_lock);
+			return mdev;
+		}
+	}
+	spin_unlock(&list_lock);
+	return NULL;
+}
+
+static int aim_rx_data(struct mbo *mbo)
+{
+	struct most_video_dev *mdev =
+		get_aim_dev(mbo->ifp, mbo->hdm_channel_id);
+
+	if (!mdev)
+		return -EIO;
+
+	spin_lock(&mdev->list_lock);
+	if (unlikely(mdev->mute)) {
+		spin_unlock(&mdev->list_lock);
+		return -EIO;
+	}
+
+	list_add_tail(&mbo->list, &mdev->pending_mbos);
+	spin_unlock(&mdev->list_lock);
+	wake_up_interruptible(&mdev->wait_data);
+	return 0;
+}
+
+static int aim_register_videodev(struct most_video_dev *mdev)
+{
+	int retval = -ENOMEM;
+	int ret;
+
+	pr_info("aim_register_videodev()\n");
+
+	init_waitqueue_head(&mdev->wait_data);
+
+	/* allocate and fill v4l2 video struct */
+	mdev->vdev = video_device_alloc();
+	if (!mdev->vdev)
+		return -ENOMEM;
+
+	/* Fill the video capture device struct */
+	*mdev->vdev = aim_videodev_template;
+	mdev->vdev->v4l2_dev = &mdev->v4l2_dev;
+	mdev->vdev->lock = &mdev->lock;
+	strcpy(mdev->vdev->name, "most v4l2 aim video");
+
+	/* Register the v4l2 device */
+	video_set_drvdata(mdev->vdev, mdev);
+	retval = video_register_device(mdev->vdev, VFL_TYPE_GRABBER, -1);
+	if (retval != 0) {
+		pr_err("video_register_device failed (%d)\n", retval);
+		ret = -ENODEV;
+		goto err_vbi_dev;
+	}
+
+	return 0;
+
+err_vbi_dev:
+	video_device_release(mdev->vdev);
+	return ret;
+}
+
+static void aim_unregister_videodev(struct most_video_dev *mdev)
+{
+	pr_info("aim_unregister_videodev()\n");
+
+	video_unregister_device(mdev->vdev);
+}
+
+static void aim_v4l2_dev_release(struct v4l2_device *v4l2_dev)
+{
+	struct most_video_dev *mdev =
+		container_of(v4l2_dev, struct most_video_dev, v4l2_dev);
+
+	v4l2_device_unregister(v4l2_dev);
+	kfree(mdev);
+}
+
+static int aim_probe_channel(struct most_interface *iface, int channel_idx,
+			     struct most_channel_config *ccfg,
+			     struct kobject *parent, char *name)
+{
+	int ret;
+	struct most_video_dev *mdev = get_aim_dev(iface, channel_idx);
+
+	pr_info("aim_probe_channel()\n");
+
+	if (mdev) {
+		pr_err("channel already linked\n");
+		return -EEXIST;
+	}
+
+	if (ccfg->direction != MOST_CH_RX) {
+		pr_err("wrong direction, expect rx\n");
+		return -EINVAL;
+	}
+
+	if (ccfg->data_type != MOST_CH_SYNC &&
+	    ccfg->data_type != MOST_CH_ISOC_AVP) {
+		pr_err("wrong channel type, expect sync or isoc_avp\n");
+		return -EINVAL;
+	}
+
+	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
+	if (!mdev)
+		return -ENOMEM;
+
+	mutex_init(&mdev->lock);
+	atomic_set(&mdev->access_ref, -1);
+	spin_lock_init(&mdev->list_lock);
+	INIT_LIST_HEAD(&mdev->pending_mbos);
+	mdev->iface = iface;
+	mdev->ch_idx = channel_idx;
+	mdev->v4l2_dev.release = aim_v4l2_dev_release;
+
+	/* Create the v4l2_device */
+	strlcpy(mdev->v4l2_dev.name, "most_video_device",
+		sizeof(mdev->v4l2_dev.name));
+	ret = v4l2_device_register(NULL, &mdev->v4l2_dev);
+	if (ret) {
+		pr_err("v4l2_device_register() failed\n");
+		kfree(mdev);
+		return ret;
+	}
+
+	ret = aim_register_videodev(mdev);
+	if (ret)
+		goto err_unreg;
+
+	spin_lock(&list_lock);
+	list_add(&mdev->list, &video_devices);
+	spin_unlock(&list_lock);
+	return 0;
+
+err_unreg:
+	v4l2_device_disconnect(&mdev->v4l2_dev);
+	v4l2_device_put(&mdev->v4l2_dev);
+	return ret;
+}
+
+static int aim_disconnect_channel(struct most_interface *iface,
+				  int channel_idx)
+{
+	struct most_video_dev *mdev = get_aim_dev(iface, channel_idx);
+
+	pr_info("aim_disconnect_channel()\n");
+
+	if (!mdev) {
+		pr_err("no such channel is linked\n");
+		return -ENOENT;
+	}
+
+	spin_lock(&list_lock);
+	list_del(&mdev->list);
+	spin_unlock(&list_lock);
+
+	aim_unregister_videodev(mdev);
+	v4l2_device_disconnect(&mdev->v4l2_dev);
+	v4l2_device_put(&mdev->v4l2_dev);
+	return 0;
+}
+
+static struct most_aim aim_info = {
+	.name = "v4l",
+	.probe_channel = aim_probe_channel,
+	.disconnect_channel = aim_disconnect_channel,
+	.rx_completion = aim_rx_data,
+};
+
+static int __init aim_init(void)
+{
+	spin_lock_init(&list_lock);
+	return most_register_aim(&aim_info);
+}
+
+static void __exit aim_exit(void)
+{
+	struct most_video_dev *mdev, *tmp;
+
+	/*
+	 * As the mostcore currently doesn't call disconnect_channel()
+	 * for linked channels while we call most_deregister_aim()
+	 * we simulate this call here.
+	 * This must be fixed in core.
+	 */
+	spin_lock(&list_lock);
+	list_for_each_entry_safe(mdev, tmp, &video_devices, list) {
+		list_del(&mdev->list);
+		spin_unlock(&list_lock);
+
+		aim_unregister_videodev(mdev);
+		v4l2_device_disconnect(&mdev->v4l2_dev);
+		v4l2_device_put(&mdev->v4l2_dev);
+		spin_lock(&list_lock);
+	}
+	spin_unlock(&list_lock);
+
+	most_deregister_aim(&aim_info);
+	BUG_ON(!list_empty(&video_devices));
+}
+
+module_init(aim_init);
+module_exit(aim_exit);
+
+MODULE_DESCRIPTION("V4L2 Application Interface Module for MostCore");
+MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
+MODULE_LICENSE("GPL");