--- /dev/null
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ * Copyright (C) 2010 R.M. Thomas
+ * <rmthomas--a.t--sciolus.org>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-event.h>
+#include <media/videobuf2-vmalloc.h>
+
+#include <media/saa7115.h>
+
+#include "stk1160.h"
+#include "stk1160-reg.h"
+
+static bool keep_buffers;
+module_param(keep_buffers, bool, 0644);
+MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
+
+/* supported video standards */
+static struct stk1160_fmt format[] = {
+ {
+ .name = "16 bpp YUY2, 4:2:2, packed",
+ .fourcc = V4L2_PIX_FMT_UYVY,
+ .depth = 16,
+ }
+};
+
+static void stk1160_set_std(struct stk1160 *dev)
+{
+ int i;
+
+ static struct regval std525[] = {
+
+ /* 720x480 */
+
+ /* Frame start */
+ {STK116_CFSPO_STX_L, 0x0000},
+ {STK116_CFSPO_STX_H, 0x0000},
+ {STK116_CFSPO_STY_L, 0x0003},
+ {STK116_CFSPO_STY_H, 0x0000},
+
+ /* Frame end */
+ {STK116_CFEPO_ENX_L, 0x05a0},
+ {STK116_CFEPO_ENX_H, 0x0005},
+ {STK116_CFEPO_ENY_L, 0x00f3},
+ {STK116_CFEPO_ENY_H, 0x0000},
+
+ {0xffff, 0xffff}
+ };
+
+ static struct regval std625[] = {
+
+ /* 720x576 */
+
+ /* TODO: Each line of frame has some junk at the end */
+ /* Frame start */
+ {STK116_CFSPO, 0x0000},
+ {STK116_CFSPO+1, 0x0000},
+ {STK116_CFSPO+2, 0x0001},
+ {STK116_CFSPO+3, 0x0000},
+
+ /* Frame end */
+ {STK116_CFEPO, 0x05a0},
+ {STK116_CFEPO+1, 0x0005},
+ {STK116_CFEPO+2, 0x0121},
+ {STK116_CFEPO+3, 0x0001},
+
+ {0xffff, 0xffff}
+ };
+
+ if (dev->norm & V4L2_STD_525_60) {
+ stk1160_dbg("registers to NTSC like standard\n");
+ for (i = 0; std525[i].reg != 0xffff; i++)
+ stk1160_write_reg(dev, std525[i].reg, std525[i].val);
+ } else {
+ stk1160_dbg("registers to PAL like standard\n");
+ for (i = 0; std625[i].reg != 0xffff; i++)
+ stk1160_write_reg(dev, std625[i].reg, std625[i].val);
+ }
+
+}
+
+/*
+ * Set a new alternate setting.
+ * Returns true is dev->max_pkt_size has changed, false otherwise.
+ */
+static bool stk1160_set_alternate(struct stk1160 *dev)
+{
+ int i, prev_alt = dev->alt;
+ unsigned int min_pkt_size;
+ bool new_pkt_size;
+
+ /*
+ * If we don't set right alternate,
+ * then we will get a green screen with junk.
+ */
+ min_pkt_size = STK1160_MIN_PKT_SIZE;
+
+ for (i = 0; i < dev->num_alt; i++) {
+ /* stop when the selected alt setting offers enough bandwidth */
+ if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
+ dev->alt = i;
+ break;
+ /*
+ * otherwise make sure that we end up with the maximum bandwidth
+ * because the min_pkt_size equation might be wrong...
+ */
+ } else if (dev->alt_max_pkt_size[i] >
+ dev->alt_max_pkt_size[dev->alt])
+ dev->alt = i;
+ }
+
+ stk1160_info("setting alternate %d\n", dev->alt);
+
+ if (dev->alt != prev_alt) {
+ stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
+ min_pkt_size, dev->alt);
+ stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
+ dev->alt, dev->alt_max_pkt_size[dev->alt]);
+ usb_set_interface(dev->udev, 0, dev->alt);
+ }
+
+ new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
+ dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
+
+ return new_pkt_size;
+}
+
+static int stk1160_start_streaming(struct stk1160 *dev)
+{
+ bool new_pkt_size;
+ int rc = 0;
+ int i;
+
+ /* Check device presence */
+ if (!dev->udev)
+ return -ENODEV;
+
+ if (mutex_lock_interruptible(&dev->v4l_lock))
+ return -ERESTARTSYS;
+ /*
+ * For some reason it is mandatory to set alternate *first*
+ * and only *then* initialize isoc urbs.
+ * Someone please explain me why ;)
+ */
+ new_pkt_size = stk1160_set_alternate(dev);
+
+ /*
+ * We (re)allocate isoc urbs if:
+ * there is no allocated isoc urbs, OR
+ * a new dev->max_pkt_size is detected
+ */
+ if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
+ rc = stk1160_alloc_isoc(dev);
+ if (rc < 0)
+ goto out_stop_hw;
+ }
+
+ /* submit urbs and enables IRQ */
+ for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
+ rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
+ if (rc) {
+ stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
+ goto out_uninit;
+ }
+ }
+
+ /* Start saa711x */
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
+
+ /* Start stk1160 */
+ stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
+ stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
+
+ stk1160_dbg("streaming started\n");
+
+ mutex_unlock(&dev->v4l_lock);
+
+ return 0;
+
+out_uninit:
+ stk1160_uninit_isoc(dev);
+out_stop_hw:
+ usb_set_interface(dev->udev, 0, 0);
+ stk1160_clear_queue(dev);
+
+ mutex_unlock(&dev->v4l_lock);
+
+ return rc;
+}
+
+/* Must be called with v4l_lock hold */
+static void stk1160_stop_hw(struct stk1160 *dev)
+{
+ /* If the device is not physically present, there is nothing to do */
+ if (!dev->udev)
+ return;
+
+ /* set alternate 0 */
+ dev->alt = 0;
+ stk1160_info("setting alternate %d\n", dev->alt);
+ usb_set_interface(dev->udev, 0, 0);
+
+ /* Stop stk1160 */
+ stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
+ stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
+
+ /* Stop saa711x */
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
+}
+
+static int stk1160_stop_streaming(struct stk1160 *dev)
+{
+ if (mutex_lock_interruptible(&dev->v4l_lock))
+ return -ERESTARTSYS;
+
+ /*
+ * Once URBs are cancelled, the URB complete handler
+ * won't be running. This is required to safely release the
+ * current buffer (dev->isoc_ctl.buf).
+ */
+ stk1160_cancel_isoc(dev);
+
+ /*
+ * It is possible to keep buffers around using a module parameter.
+ * This is intended to avoid memory fragmentation.
+ */
+ if (!keep_buffers)
+ stk1160_free_isoc(dev);
+
+ stk1160_stop_hw(dev);
+
+ stk1160_clear_queue(dev);
+
+ stk1160_dbg("streaming stopped\n");
+
+ mutex_unlock(&dev->v4l_lock);
+
+ return 0;
+}
+
+static struct v4l2_file_operations stk1160_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_querycap(struct file *file,
+ void *priv, struct v4l2_capability *cap)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ strcpy(cap->driver, "stk1160");
+ strcpy(cap->card, "stk1160");
+ 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_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_g_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ f->fmt.pix.width = dev->width;
+ f->fmt.pix.height = dev->height;
+ f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+ f->fmt.pix.pixelformat = dev->fmt->fourcc;
+ f->fmt.pix.bytesperline = dev->width * 2;
+ f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
+ f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+ return 0;
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ /*
+ * User can't choose size at his own will,
+ * so we just return him the current size chosen
+ * at standard selection.
+ * TODO: Implement frame scaling?
+ */
+
+ 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;
+
+ return 0;
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct stk1160 *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);
+
+ /* We don't support any format changes */
+
+ return 0;
+}
+
+static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
+{
+ struct stk1160 *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 stk1160 *dev = video_drvdata(file);
+
+ *norm = dev->norm;
+ return 0;
+}
+
+static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
+{
+ struct stk1160 *dev = video_drvdata(file);
+ struct vb2_queue *q = &dev->vb_vidq;
+
+ if (dev->norm == norm)
+ return 0;
+
+ if (vb2_is_busy(q))
+ return -EBUSY;
+
+ /* Check device presence */
+ if (!dev->udev)
+ return -ENODEV;
+
+ /* We need to set this now, before we call stk1160_set_std */
+ dev->norm = norm;
+
+ /* This is taken from saa7115 video decoder */
+ if (dev->norm & V4L2_STD_525_60) {
+ dev->width = 720;
+ dev->height = 480;
+ } else if (dev->norm & V4L2_STD_625_50) {
+ dev->width = 720;
+ dev->height = 576;
+ } else {
+ stk1160_err("invalid standard\n");
+ return -EINVAL;
+ }
+
+ stk1160_set_std(dev);
+
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
+ dev->norm);
+
+ return 0;
+}
+
+
+static int vidioc_enum_input(struct file *file, void *priv,
+ struct v4l2_input *i)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ if (i->index > STK1160_MAX_INPUT)
+ return -EINVAL;
+
+ /* S-Video special handling */
+ if (i->index == STK1160_SVIDEO_INPUT)
+ sprintf(i->name, "S-Video");
+ else
+ sprintf(i->name, "Composite%d", i->index);
+
+ 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 stk1160 *dev = video_drvdata(file);
+ *i = dev->ctl_input;
+ return 0;
+}
+
+static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ if (i > STK1160_MAX_INPUT)
+ return -EINVAL;
+
+ dev->ctl_input = i;
+
+ stk1160_select_input(dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int vidioc_g_register(struct file *file, void *priv,
+ struct v4l2_dbg_register *reg)
+{
+ struct stk1160 *dev = video_drvdata(file);
+ int rc;
+ u8 val;
+
+ /* Match host */
+ rc = stk1160_read_reg(dev, reg->reg, &val);
+ reg->val = val;
+ reg->size = 1;
+
+ return rc;
+}
+
+static int vidioc_s_register(struct file *file, void *priv,
+ const struct v4l2_dbg_register *reg)
+{
+ struct stk1160 *dev = video_drvdata(file);
+
+ /* Match host */
+ return stk1160_write_reg(dev, reg->reg, reg->val);
+}
+#endif
+
+static const struct v4l2_ioctl_ops stk1160_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 takes care of these */
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .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,
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ .vidioc_g_register = vidioc_g_register,
+ .vidioc_s_register = vidioc_s_register,
+#endif
+};
+
+/********************************************************************/
+
+/*
+ * Videobuf2 operations
+ */
+static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *v4l_fmt,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[], void *alloc_ctxs[])
+{
+ struct stk1160 *dev = vb2_get_drv_priv(vq);
+ unsigned long size;
+
+ size = dev->width * dev->height * 2;
+
+ /*
+ * Here we can change the number of buffers being requested.
+ * So, we set a minimum and a maximum like this:
+ */
+ *nbuffers = clamp_t(unsigned int, *nbuffers,
+ STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
+
+ /* This means a packed colorformat */
+ *nplanes = 1;
+
+ sizes[0] = size;
+
+ stk1160_info("%s: buffer count %d, each %ld bytes\n",
+ __func__, *nbuffers, size);
+
+ return 0;
+}
+
+static void buffer_queue(struct vb2_buffer *vb)
+{
+ unsigned long flags;
+ struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
+ struct stk1160_buffer *buf =
+ container_of(vb, struct stk1160_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->bytesused = 0;
+ buf->pos = 0;
+
+ /*
+ * If buffer length is less from expected then we return
+ * the buffer to userspace directly.
+ */
+ 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 stk1160 *dev = vb2_get_drv_priv(vq);
+ return stk1160_start_streaming(dev);
+}
+
+/* abort streaming and wait for last buffer */
+static void stop_streaming(struct vb2_queue *vq)
+{
+ struct stk1160 *dev = vb2_get_drv_priv(vq);
+ stk1160_stop_streaming(dev);
+}
+
+static struct vb2_ops stk1160_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 v4l_template = {
+ .name = "stk1160",
+ .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50,
+ .fops = &stk1160_fops,
+ .ioctl_ops = &stk1160_ioctl_ops,
+ .release = video_device_release_empty,
+};
+
+/********************************************************************/
+
+/* Must be called with both v4l_lock and vb_queue_lock hold */
+void stk1160_clear_queue(struct stk1160 *dev)
+{
+ struct stk1160_buffer *buf;
+ unsigned long flags;
+
+ /* Release all active buffers */
+ spin_lock_irqsave(&dev->buf_lock, flags);
+ while (!list_empty(&dev->avail_bufs)) {
+ buf = list_first_entry(&dev->avail_bufs,
+ struct stk1160_buffer, list);
+ list_del(&buf->list);
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+ stk1160_info("buffer [%p/%d] aborted\n",
+ buf, buf->vb.v4l2_buf.index);
+ }
+
+ /* It's important to release the current buffer */
+ if (dev->isoc_ctl.buf) {
+ buf = dev->isoc_ctl.buf;
+ dev->isoc_ctl.buf = NULL;
+
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+ stk1160_info("buffer [%p/%d] aborted\n",
+ buf, buf->vb.v4l2_buf.index);
+ }
+ spin_unlock_irqrestore(&dev->buf_lock, flags);
+}
+
+int stk1160_vb2_setup(struct stk1160 *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 stk1160_buffer);
+ q->ops = &stk1160_video_qops;
+ q->mem_ops = &vb2_vmalloc_memops;
+ q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+
+ rc = vb2_queue_init(q);
+ if (rc < 0)
+ return rc;
+
+ /* initialize video dma queue */
+ INIT_LIST_HEAD(&dev->avail_bufs);
+
+ return 0;
+}
+
+int stk1160_video_register(struct stk1160 *dev)
+{
+ int rc;
+
+ /* Initialize video_device with a template structure */
+ dev->vdev = v4l_template;
+ dev->vdev.queue = &dev->vb_vidq;
+
+ /*
+ * Provide mutexes for v4l2 core and for videobuf2 queue.
+ * It will be used to protect *only* v4l2 ioctls.
+ */
+ dev->vdev.lock = &dev->v4l_lock;
+ dev->vdev.queue->lock = &dev->vb_queue_lock;
+
+ /* This will be used to set video_device parent */
+ dev->vdev.v4l2_dev = &dev->v4l2_dev;
+
+ /* NTSC is default */
+ dev->norm = V4L2_STD_NTSC_M;
+ dev->width = 720;
+ dev->height = 480;
+
+ /* set default format */
+ dev->fmt = &format[0];
+ stk1160_set_std(dev);
+
+ v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
+ dev->norm);
+
+ video_set_drvdata(&dev->vdev, dev);
+ rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
+ if (rc < 0) {
+ stk1160_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;
+}
Code Review / kvmfornfv.git / blobdiff