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Message-Id: <1363270024-12127-5-git-send-email-jonarne@jonarne.no>
Date: Thu, 14 Mar 2013 15:07:00 +0100
From: Jon Arne Jørgensen <jonarne@...arne.no>
To: linux-media@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hverkuil@...all.nl,
elezegarcia@...il.com,
Jon Arne Jørgensen <jonarne@...arne.no>
Subject: [RFC V1 4/8] smi2021: Add smi2021_v4l2.c
This file is responsible for registering the device with the v4l2 subsystem,
and the communication with v4l2.
Most of the v4l2 ioctls are just passed on to vidbuf2.
Signed-off-by: Jon Arne Jørgensen <jonarne@...arne.no>
---
drivers/media/usb/smi2021/smi2021_v4l2.c | 566 +++++++++++++++++++++++++++++++
1 file changed, 566 insertions(+)
create mode 100644 drivers/media/usb/smi2021/smi2021_v4l2.c
diff --git a/drivers/media/usb/smi2021/smi2021_v4l2.c b/drivers/media/usb/smi2021/smi2021_v4l2.c
new file mode 100644
index 0000000..d402093
--- /dev/null
+++ b/drivers/media/usb/smi2021/smi2021_v4l2.c
@@ -0,0 +1,566 @@
+/*******************************************************************************
+ * smi2021_v4l2.c *
+ * *
+ * USB Driver for smi2021 - EasyCap *
+ * USB ID 1c88:003c *
+ * *
+ * *****************************************************************************
+ *
+ * Copyright 2011-2013 Jon Arne Jørgensen
+ * <jonjon.arnearne--a.t--gmail.com>
+ *
+ * Copyright 2011, 2012 Tony Brown, Michal Demin, Jeffry Johnston
+ *
+ * This file is part of SMI2021
+ * http://code.google.com/p/easycap-somagic-linux/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * This driver is heavily influensed by the STK1160 driver.
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ */
+
+#include "smi2021.h"
+
+static struct smi2021_fmt format[] = {
+ {
+ .name = "16bpp YU2, 4:2:2, packed",
+ .fourcc = V4L2_PIX_FMT_UYVY,
+ .depth = 16,
+ }
+};
+
+static const int inputs = 2;
+static struct smi2021_input input[] = {
+ {
+ .name = "Composite",
+ .type = SAA7115_COMPOSITE0,
+ },
+ {
+ .name = "S-Video",
+ .type = SAA7115_SVIDEO1,
+ }
+};
+
+static void smi2021_set_input(struct smi2021_dev *dev)
+{
+ if (dev->udev == NULL)
+ return;
+
+ if (dev->ctl_input >= inputs) {
+ smi2021_err("BUG: ctl_input to big!\n");
+ return;
+ }
+
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
+ input[dev->ctl_input].type, 0, 0);
+}
+
+static int smi2021_start_streaming(struct smi2021_dev *dev)
+{
+ u8 data[2];
+ int i, rc = 0;
+ data[0] = 0x01;
+ data[1] = 0x05;
+
+ if (!dev->udev)
+ return -ENODEV;
+
+ dev->sync_state = HSYNC;
+ dev->buf_count = 0;
+
+ if (mutex_lock_interruptible(&dev->v4l2_lock))
+ return -ERESTARTSYS;
+
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
+
+ /* The saa 7115 driver sets these wrong,
+ * this leads to sync issues.
+ * V_GATE1_START
+ * V_GATE1_STOP
+ * V_GATE1_MSB
+ * All these should be 0x00 for this device.
+ */
+ smi2021_write_reg(dev, 0x4a, 0x15, 0x00);
+ smi2021_write_reg(dev, 0x4a, 0x16, 0x00);
+ smi2021_write_reg(dev, 0x4a, 0x17, 0x00);
+
+ rc = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0x00),
+ 0x01, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ 0x01, 0x00, data, sizeof(data), 1000);
+ if (rc < 0) {
+ smi2021_err("Could not start device!\n");
+ goto out_unlock;
+ }
+
+ /* It's mandatory to set alt interface before allocating isoc buffer */
+ usb_set_interface(dev->udev, 0, 2);
+
+ smi2021_write_reg(dev, 0, 0x1740, 0x1d);
+
+ if (!dev->isoc_ctl.num_bufs) {
+ rc = smi2021_alloc_isoc(dev);
+ if (rc < 0)
+ goto out_stop_hw;
+ }
+
+ /* submit urbs and enable IRQ */
+ for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
+ rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
+ if (rc) {
+ smi2021_err("cannot submit urb[%d] (%d)\n", i, rc);
+ goto out_uninit;
+ }
+ }
+
+ mutex_unlock(&dev->v4l2_lock);
+
+ smi2021_dbg("Streaming started!");
+ return 0;
+
+out_uninit:
+ smi2021_uninit_isoc(dev);
+out_stop_hw:
+ usb_set_interface(dev->udev, 0, 0);
+ smi2021_clear_queue(dev);
+
+out_unlock:
+ mutex_unlock(&dev->v4l2_lock);
+
+ return rc;
+}
+
+/* Must be called with v4l2_lock hold */
+static void smi2021_stop_hw(struct smi2021_dev *dev)
+{
+ int rc = 0;
+ u8 data[] = { 0x01, 0x03 };
+
+ if (!dev->udev)
+ return;
+
+ usb_set_interface(dev->udev, 0, 0);
+
+ rc = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0x00),
+ 0x01, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ 0x01, 0x00, data, sizeof(data), 1000);
+ if (rc < 0)
+ smi2021_err("Could not stop device!\n");
+
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
+}
+
+static int smi2021_stop_streaming(struct smi2021_dev *dev)
+{
+ /* HACK: Stop the audio subsystem,
+ * without this, the pcm middle-layer will hang waiting for more data.
+ *
+ * Is there a better way to do this?
+ */
+ if (dev->pcm_substream && dev->pcm_substream->runtime) {
+ struct snd_pcm_runtime *runtime = dev->pcm_substream->runtime;
+ if (runtime->status) {
+ runtime->status->state = SNDRV_PCM_STATE_DRAINING;
+ wake_up(&runtime->sleep);
+ }
+ }
+
+ if (mutex_lock_interruptible(&dev->v4l2_lock))
+ return -ERESTARTSYS;
+
+ smi2021_cancel_isoc(dev);
+ smi2021_free_isoc(dev);
+ smi2021_stop_hw(dev);
+ smi2021_clear_queue(dev);
+
+ smi2021_dbg("Streaming stopped!\n");
+
+ mutex_unlock(&dev->v4l2_lock);
+
+ return 0;
+}
+
+static struct v4l2_file_operations smi2021_fops = {
+ .owner = THIS_MODULE,
+ .open = v4l2_fh_open,
+ .release = vb2_fop_release,
+ .read = vb2_fop_read,
+ .poll = vb2_fop_poll,
+ .mmap = vb2_fop_mmap,
+ .unlocked_ioctl = video_ioctl2,
+};
+
+/******************************************************************************/
+/* */
+/* Vidioc IOCTLS */
+/* */
+/******************************************************************************/
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_fmtdesc *f)
+{
+ if (f->index != 0)
+ return -EINVAL;
+
+ strlcpy(f->description, format[f->index].name, sizeof(f->description));
+ f->pixelformat = format[f->index].fourcc;
+
+ return 0;
+}
+
+static int vidioc_querycap(struct file *file, void *priv,
+ struct v4l2_capability *cap)
+{
+ struct smi2021_dev *dev = video_drvdata(file);
+
+ strcpy(cap->driver, "smi2021");
+ strcpy(cap->card, "smi2021");
+ usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
+ cap->device_caps =
+ V4L2_CAP_VIDEO_CAPTURE |
+ V4L2_CAP_STREAMING |
+ V4L2_CAP_READWRITE;
+ cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+
+ return 0;
+}
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct smi2021_dev *dev = video_drvdata(file);
+
+ f->fmt.pix.pixelformat = dev->fmt->fourcc;
+ f->fmt.pix.width = dev->width;
+ f->fmt.pix.height = dev->height;
+ f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+ f->fmt.pix.bytesperline = dev->width * 2;
+ f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
+ f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+ f->fmt.pix.priv = 0;
+
+ return 0;
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct smi2021_dev *dev = video_drvdata(file);
+
+ f->fmt.pix.pixelformat = dev->fmt->fourcc;
+ f->fmt.pix.width = dev->width;
+ f->fmt.pix.height = dev->height;
+ f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+ f->fmt.pix.bytesperline = dev->width * 2;
+ f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
+ f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+ f->fmt.pix.priv = 0;
+
+ return 0;
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct smi2021_dev *dev = video_drvdata(file);
+ struct vb2_queue *q = &dev->vb_vidq;
+
+ if (vb2_is_busy(q))
+ return -EBUSY;
+
+ vidioc_try_fmt_vid_cap(file, priv, f);
+ return 0;
+}
+
+static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
+{
+ struct smi2021_dev *dev = video_drvdata(file);
+
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
+ return 0;
+}
+
+static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
+{
+ struct smi2021_dev *dev = video_drvdata(file);
+
+ *norm = dev->norm;
+ return 0;
+}
+
+static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *norm)
+{
+ struct smi2021_dev *dev = video_drvdata(file);
+ struct vb2_queue *q = &dev->vb_vidq;
+
+ if (vb2_is_busy(q))
+ return -EBUSY;
+
+ if (!dev->udev)
+ return -ENODEV;
+
+ dev->norm = *norm;
+ if (dev->norm & V4L2_STD_525_60) {
+ dev->width = SMI2021_BYTES_PER_LINE / 2;
+ dev->height = SMI2021_NTSC_LINES;
+ } else if (dev->norm & V4L2_STD_625_50) {
+ dev->width = SMI2021_BYTES_PER_LINE / 2;
+ dev->height = SMI2021_PAL_LINES;
+ } else {
+ smi2021_err("Invalid standard\n");
+ return -EINVAL;
+ }
+
+ v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_std, dev->norm);
+ return 0;
+}
+
+static int vidioc_enum_input(struct file *file, void *priv,
+ struct v4l2_input *i)
+{
+ struct smi2021_dev *dev = video_drvdata(file);
+
+ if (i->index >= inputs)
+ return -EINVAL;
+
+ strlcpy(i->name, input[i->index].name, sizeof(i->name));
+ i->type = V4L2_INPUT_TYPE_CAMERA;
+ i->std = dev->vdev.tvnorms;
+ return 0;
+}
+
+static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
+{
+ struct smi2021_dev *dev = video_drvdata(file);
+ *i = dev->ctl_input;
+ return 0;
+}
+
+static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
+{
+ struct smi2021_dev *dev = video_drvdata(file);
+
+ if (i >= inputs)
+ return -EINVAL;
+
+ dev->ctl_input = i;
+ smi2021_set_input(dev);
+
+ return 0;
+}
+
+static int vidioc_g_chip_ident(struct file *file, void *priv,
+ struct v4l2_dbg_chip_ident *chip)
+{
+ switch (chip->match.type) {
+ case V4L2_CHIP_MATCH_HOST:
+ chip->ident = V4L2_IDENT_NONE;
+ chip->revision = 0;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct v4l2_ioctl_ops smi2021_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_querystd = vidioc_querystd,
+ .vidioc_g_std = vidioc_g_std,
+ .vidioc_s_std = vidioc_s_std,
+ .vidioc_enum_input = vidioc_enum_input,
+ .vidioc_g_input = vidioc_g_input,
+ .vidioc_s_input = vidioc_s_input,
+
+ /* vb2 handle these */
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+
+ .vidioc_log_status = v4l2_ctrl_log_status,
+ .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+ .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+ .vidioc_g_chip_ident = vidioc_g_chip_ident,
+
+};
+
+/******************************************************************************/
+/* */
+/* Videobuf2 operations */
+/* */
+/******************************************************************************/
+static int queue_setup(struct vb2_queue *vq,
+ const struct v4l2_format *v4l2_fmt,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[], void *alloc_ctxs[])
+{
+ struct smi2021_dev *dev = vb2_get_drv_priv(vq);
+ unsigned long size;
+
+ size = dev->width * dev->height * 2;
+
+ *nbuffers = clamp_t(unsigned int, *nbuffers, 2, 4);
+
+ /* Packed color format */
+ *nplanes = 1;
+ sizes[0] = size;
+
+ return 0;
+}
+
+static void buffer_queue(struct vb2_buffer *vb)
+{
+ unsigned long flags;
+ struct smi2021_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
+ struct smi2021_buffer *buf = container_of(vb, struct smi2021_buffer,
+ vb);
+
+ spin_lock_irqsave(&dev->buf_lock, flags);
+ if (!dev->udev) {
+ /*
+ * If the device is disconnected return the buffer to userspace
+ * directly. The next QBUF call will fail with -ENODEV.
+ */
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+ } else {
+ buf->mem = vb2_plane_vaddr(vb, 0);
+ buf->length = vb2_plane_size(vb, 0);
+
+ buf->pos = 0;
+ buf->trc_av = 0;
+ buf->in_blank = true;
+ buf->second_field = false;
+
+ if (buf->length < dev->width * dev->height * 2)
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+ else
+ list_add_tail(&buf->list, &dev->avail_bufs);
+ }
+ spin_unlock_irqrestore(&dev->buf_lock, flags);
+}
+
+static int start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct smi2021_dev *dev = vb2_get_drv_priv(vq);
+ return smi2021_start_streaming(dev);
+}
+
+static int stop_streaming(struct vb2_queue *vq)
+{
+ struct smi2021_dev *dev = vb2_get_drv_priv(vq);
+ return smi2021_stop_streaming(dev);
+}
+
+static struct vb2_ops smi2021_video_qops = {
+ .queue_setup = queue_setup,
+ .buf_queue = buffer_queue,
+ .start_streaming = start_streaming,
+ .stop_streaming = stop_streaming,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+};
+
+static struct video_device v4l2_template = {
+ .name = "easycap_smi2021_dc60",
+ .tvnorms = V4L2_STD_625_50 | V4L2_STD_525_60,
+ .fops = &smi2021_fops,
+ .ioctl_ops = &smi2021_ioctl_ops,
+ .release = video_device_release_empty,
+};
+
+/* Must be called with both v4l2_lock and vb_queue_lock hold */
+void smi2021_clear_queue(struct smi2021_dev *dev)
+{
+ struct smi2021_buffer *buf;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->buf_lock, flags);
+ while (!list_empty(&dev->avail_bufs)) {
+ buf = list_first_entry(&dev->avail_bufs,
+ struct smi2021_buffer, list);
+ list_del(&buf->list);
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+ }
+ dev->isoc_ctl.buf = NULL;
+ spin_unlock_irqrestore(&dev->buf_lock, flags);
+}
+
+int smi2021_vb2_setup(struct smi2021_dev *dev)
+{
+ int rc;
+ struct vb2_queue *q;
+
+ q = &dev->vb_vidq;
+ q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR;
+ q->drv_priv = dev;
+ q->buf_struct_size = sizeof(struct smi2021_buffer);
+ q->ops = &smi2021_video_qops;
+ q->mem_ops = &vb2_vmalloc_memops;
+
+ rc = vb2_queue_init(q);
+ if (rc < 0)
+ return rc;
+
+ /* Initialize video dma queue */
+ INIT_LIST_HEAD(&dev->avail_bufs);
+
+ return 0;
+}
+
+int smi2021_video_register(struct smi2021_dev *dev)
+{
+ int rc;
+
+ dev->vdev = v4l2_template;
+ dev->vdev.debug = 0;
+ dev->vdev.queue = &dev->vb_vidq;
+
+ dev->vdev.lock = &dev->v4l2_lock;
+ dev->vdev.queue->lock = &dev->vb_queue_lock;
+
+ dev->vdev.v4l2_dev = &dev->v4l2_dev;
+ set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
+
+ /* PAL is default */
+ dev->norm = V4L2_STD_PAL;
+ dev->width = SMI2021_BYTES_PER_LINE / 2;
+ dev->height = SMI2021_PAL_LINES;
+
+ dev->fmt = &format[0];
+
+ v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_std, dev->norm);
+ smi2021_set_input(dev);
+
+ video_set_drvdata(&dev->vdev, dev);
+ rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
+ if (rc < 0) {
+ smi2021_err("video_register_device failed %d\n", rc);
+ return rc;
+ }
+
+ v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
+ video_device_node_name(&dev->vdev));
+
+ return 0;
+}
--
1.8.1.1
--
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