// SPDX-License-Identifier: GPL-2.0-or-later /* * STK1160 driver * * Copyright (C) 2012 Ezequiel Garcia * * * Based on Easycap driver by R.M. Thomas * Copyright (C) 2010 R.M. Thomas * */ #include #include #include #include #include #include #include #include #include #include #include #include #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"); enum stk1160_decimate_mode { STK1160_DECIMATE_MORE_THAN_HALF, STK1160_DECIMATE_LESS_THAN_HALF, }; struct stk1160_decimate_ctrl { bool col_en, row_en; enum stk1160_decimate_mode col_mode, row_mode; unsigned int col_n, row_n; }; /* supported video standards */ static struct stk1160_fmt format[] = { { .fourcc = V4L2_PIX_FMT_UYVY, .depth = 16, } }; /* * Helper to find the next divisor that results in modulo being zero. * This is required to guarantee valid decimation unit counts. */ static unsigned int div_round_integer(unsigned int x, unsigned int y) { for (;; y++) { if (x % y == 0) return x / y; } } 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); } } static void stk1160_set_fmt(struct stk1160 *dev, struct stk1160_decimate_ctrl *ctrl) { u32 val = 0; if (ctrl) { /* * Since the format is UYVY, the device must skip or send * a number of rows/columns multiple of four. This way, the * colour format is preserved. The STK1160_DEC_UNIT_SIZE bit * does exactly this. */ val |= STK1160_DEC_UNIT_SIZE; val |= ctrl->col_en ? STK1160_H_DEC_EN : 0; val |= ctrl->row_en ? STK1160_V_DEC_EN : 0; val |= ctrl->col_mode == STK1160_DECIMATE_MORE_THAN_HALF ? STK1160_H_DEC_MODE : 0; val |= ctrl->row_mode == STK1160_DECIMATE_MORE_THAN_HALF ? STK1160_V_DEC_MODE : 0; /* Horizontal count units */ stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n); /* Vertical count units */ stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n); stk1160_dbg("decimate 0x%x, column units %d, row units %d\n", val, ctrl->col_n, ctrl->row_n); } /* Decimation control */ stk1160_write_reg(dev, STK1160_DMCTRL, 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_dbg("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++) { struct stk1160_urb *stk_urb = &dev->isoc_ctl.urb_ctl[i]; dma_sync_sgtable_for_device(stk1160_get_dmadev(dev), stk_urb->sgt, DMA_FROM_DEVICE); rc = usb_submit_urb(dev->isoc_ctl.urb_ctl[i].urb, 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); dev->sequence = 0; /* 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, VB2_BUF_STATE_QUEUED); 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_dbg("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, VB2_BUF_STATE_ERROR); stk1160_dbg("streaming stopped\n"); mutex_unlock(&dev->v4l_lock); return 0; } static const 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); strscpy(cap->driver, "stk1160", sizeof(cap->driver)); strscpy(cap->card, "stk1160", sizeof(cap->card)); usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info)); return 0; } static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, struct v4l2_fmtdesc *f) { if (f->index != 0) return -EINVAL; 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 stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f, struct stk1160_decimate_ctrl *ctrl) { unsigned int width, height; unsigned int base_width, base_height; unsigned int col_n, row_n; enum stk1160_decimate_mode col_mode, row_mode; bool col_en, row_en; base_width = 720; base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576; /* Minimum width and height is 5% the frame size */ width = clamp_t(unsigned int, f->fmt.pix.width, base_width / 20, base_width); height = clamp_t(unsigned int, f->fmt.pix.height, base_height / 20, base_height); /* Let's set default no decimation values */ col_n = 0; row_n = 0; col_en = false; row_en = false; f->fmt.pix.width = base_width; f->fmt.pix.height = base_height; row_mode = STK1160_DECIMATE_LESS_THAN_HALF; col_mode = STK1160_DECIMATE_LESS_THAN_HALF; if (width < base_width && width > base_width / 2) { /* * The device will send count units for each * unit skipped. This means count unit is: * * n = width / (frame width - width) * * And the width is: * * width = (n / n + 1) * frame width */ col_n = div_round_integer(width, base_width - width); if (col_n > 0 && col_n <= 255) { col_en = true; col_mode = STK1160_DECIMATE_LESS_THAN_HALF; f->fmt.pix.width = (base_width * col_n) / (col_n + 1); } } else if (width <= base_width / 2) { /* * The device will skip count units for each * unit sent. This means count is: * * n = (frame width / width) - 1 * * And the width is: * * width = frame width / (n + 1) */ col_n = div_round_integer(base_width, width) - 1; if (col_n > 0 && col_n <= 255) { col_en = true; col_mode = STK1160_DECIMATE_MORE_THAN_HALF; f->fmt.pix.width = base_width / (col_n + 1); } } if (height < base_height && height > base_height / 2) { row_n = div_round_integer(height, base_height - height); if (row_n > 0 && row_n <= 255) { row_en = true; row_mode = STK1160_DECIMATE_LESS_THAN_HALF; f->fmt.pix.height = (base_height * row_n) / (row_n + 1); } } else if (height <= base_height / 2) { row_n = div_round_integer(base_height, height) - 1; if (row_n > 0 && row_n <= 255) { row_en = true; row_mode = STK1160_DECIMATE_MORE_THAN_HALF; f->fmt.pix.height = base_height / (row_n + 1); } } f->fmt.pix.pixelformat = dev->fmt->fourcc; f->fmt.pix.field = V4L2_FIELD_INTERLACED; f->fmt.pix.bytesperline = f->fmt.pix.width * 2; f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline; f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; if (ctrl) { ctrl->col_en = col_en; ctrl->col_n = col_n; ctrl->col_mode = col_mode; ctrl->row_en = row_en; ctrl->row_n = row_n; ctrl->row_mode = row_mode; } stk1160_dbg("width %d, height %d\n", f->fmt.pix.width, f->fmt.pix.height); return 0; } static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *f) { struct stk1160 *dev = video_drvdata(file); return stk1160_try_fmt(dev, f, NULL); } 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; struct stk1160_decimate_ctrl ctrl; int rc; if (vb2_is_busy(q)) return -EBUSY; rc = stk1160_try_fmt(dev, f, &ctrl); if (rc < 0) return rc; dev->width = f->fmt.pix.width; dev->height = f->fmt.pix.height; stk1160_set_fmt(dev, &ctrl); 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->width = 720; dev->height = (norm & V4L2_STD_525_60) ? 480 : 576; dev->norm = norm; stk1160_set_std(dev); /* Calling with NULL disables frame decimation */ stk1160_set_fmt(dev, NULL); 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_expbuf = vb2_ioctl_expbuf, .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, unsigned int *nbuffers, unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[]) { 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); if (*nplanes) return sizes[0] < size ? -EINVAL : 0; /* This means a packed colorformat */ *nplanes = 1; sizes[0] = size; stk1160_dbg("%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 vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); struct stk1160_buffer *buf = container_of(vbuf, 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, 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, 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 const struct vb2_ops stk1160_video_qops = { .queue_setup = queue_setup, .buf_queue = buffer_queue, .start_streaming = start_streaming, .stop_streaming = stop_streaming, }; static const 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, enum vb2_buffer_state vb2_state) { 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, vb2_state); stk1160_dbg("buffer [%p/%d] aborted\n", buf, buf->vb.vb2_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, vb2_state); stk1160_dbg("buffer [%p/%d] aborted\n", buf, buf->vb.vb2_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 | VB2_DMABUF; q->drv_priv = dev; q->buf_struct_size = sizeof(struct stk1160_buffer); q->ops = &stk1160_video_qops; q->mem_ops = &vb2_vmalloc_memops; q->lock = &dev->vb_queue_lock; 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; /* This will be used to set video_device parent */ dev->vdev.v4l2_dev = &dev->v4l2_dev; dev->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING | V4L2_CAP_READWRITE; /* 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_VIDEO, -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; }