diff options
Diffstat (limited to 'drivers/media/video/mem2mem_testdev.c')
| -rw-r--r-- | drivers/media/video/mem2mem_testdev.c | 1052 |
1 files changed, 1052 insertions, 0 deletions
diff --git a/drivers/media/video/mem2mem_testdev.c b/drivers/media/video/mem2mem_testdev.c new file mode 100644 index 000000000000..554eaf140128 --- /dev/null +++ b/drivers/media/video/mem2mem_testdev.c @@ -0,0 +1,1052 @@ +/* + * A virtual v4l2-mem2mem example device. + * + * This is a virtual device driver for testing mem-to-mem videobuf framework. + * It simulates a device that uses memory buffers for both source and + * destination, processes the data and issues an "irq" (simulated by a timer). + * The device is capable of multi-instance, multi-buffer-per-transaction + * operation (via the mem2mem framework). + * + * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd. + * Pawel Osciak, <p.osciak@samsung.com> + * Marek Szyprowski, <m.szyprowski@samsung.com> + * + * 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 + */ +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/fs.h> +#include <linux/version.h> +#include <linux/timer.h> +#include <linux/sched.h> +#include <linux/slab.h> + +#include <linux/platform_device.h> +#include <media/v4l2-mem2mem.h> +#include <media/v4l2-device.h> +#include <media/v4l2-ioctl.h> +#include <media/videobuf-vmalloc.h> + +#define MEM2MEM_TEST_MODULE_NAME "mem2mem-testdev" + +MODULE_DESCRIPTION("Virtual device for mem2mem framework testing"); +MODULE_AUTHOR("Pawel Osciak, <p.osciak@samsung.com>"); +MODULE_LICENSE("GPL"); + + +#define MIN_W 32 +#define MIN_H 32 +#define MAX_W 640 +#define MAX_H 480 +#define DIM_ALIGN_MASK 0x08 /* 8-alignment for dimensions */ + +/* Flags that indicate a format can be used for capture/output */ +#define MEM2MEM_CAPTURE (1 << 0) +#define MEM2MEM_OUTPUT (1 << 1) + +#define MEM2MEM_NAME "m2m-testdev" + +/* Per queue */ +#define MEM2MEM_DEF_NUM_BUFS VIDEO_MAX_FRAME +/* In bytes, per queue */ +#define MEM2MEM_VID_MEM_LIMIT (16 * 1024 * 1024) + +/* Default transaction time in msec */ +#define MEM2MEM_DEF_TRANSTIME 1000 +/* Default number of buffers per transaction */ +#define MEM2MEM_DEF_TRANSLEN 1 +#define MEM2MEM_COLOR_STEP (0xff >> 4) +#define MEM2MEM_NUM_TILES 8 + +#define dprintk(dev, fmt, arg...) \ + v4l2_dbg(1, 1, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg) + + +void m2mtest_dev_release(struct device *dev) +{} + +static struct platform_device m2mtest_pdev = { + .name = MEM2MEM_NAME, + .dev.release = m2mtest_dev_release, +}; + +struct m2mtest_fmt { + char *name; + u32 fourcc; + int depth; + /* Types the format can be used for */ + u32 types; +}; + +static struct m2mtest_fmt formats[] = { + { + .name = "RGB565 (BE)", + .fourcc = V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */ + .depth = 16, + /* Both capture and output format */ + .types = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT, + }, + { + .name = "4:2:2, packed, YUYV", + .fourcc = V4L2_PIX_FMT_YUYV, + .depth = 16, + /* Output-only format */ + .types = MEM2MEM_OUTPUT, + }, +}; + +/* Per-queue, driver-specific private data */ +struct m2mtest_q_data { + unsigned int width; + unsigned int height; + unsigned int sizeimage; + struct m2mtest_fmt *fmt; +}; + +enum { + V4L2_M2M_SRC = 0, + V4L2_M2M_DST = 1, +}; + +/* Source and destination queue data */ +static struct m2mtest_q_data q_data[2]; + +static struct m2mtest_q_data *get_q_data(enum v4l2_buf_type type) +{ + switch (type) { + case V4L2_BUF_TYPE_VIDEO_OUTPUT: + return &q_data[V4L2_M2M_SRC]; + case V4L2_BUF_TYPE_VIDEO_CAPTURE: + return &q_data[V4L2_M2M_DST]; + default: + BUG(); + } + return NULL; +} + +#define V4L2_CID_TRANS_TIME_MSEC V4L2_CID_PRIVATE_BASE +#define V4L2_CID_TRANS_NUM_BUFS (V4L2_CID_PRIVATE_BASE + 1) + +static struct v4l2_queryctrl m2mtest_ctrls[] = { + { + .id = V4L2_CID_TRANS_TIME_MSEC, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Transaction time (msec)", + .minimum = 1, + .maximum = 10000, + .step = 100, + .default_value = 1000, + .flags = 0, + }, { + .id = V4L2_CID_TRANS_NUM_BUFS, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Buffers per transaction", + .minimum = 1, + .maximum = MEM2MEM_DEF_NUM_BUFS, + .step = 1, + .default_value = 1, + .flags = 0, + }, +}; + +#define NUM_FORMATS ARRAY_SIZE(formats) + +static struct m2mtest_fmt *find_format(struct v4l2_format *f) +{ + struct m2mtest_fmt *fmt; + unsigned int k; + + for (k = 0; k < NUM_FORMATS; k++) { + fmt = &formats[k]; + if (fmt->fourcc == f->fmt.pix.pixelformat) + break; + } + + if (k == NUM_FORMATS) + return NULL; + + return &formats[k]; +} + +struct m2mtest_dev { + struct v4l2_device v4l2_dev; + struct video_device *vfd; + + atomic_t num_inst; + struct mutex dev_mutex; + spinlock_t irqlock; + + struct timer_list timer; + + struct v4l2_m2m_dev *m2m_dev; +}; + +struct m2mtest_ctx { + struct m2mtest_dev *dev; + + /* Processed buffers in this transaction */ + u8 num_processed; + + /* Transaction length (i.e. how many buffers per transaction) */ + u32 translen; + /* Transaction time (i.e. simulated processing time) in milliseconds */ + u32 transtime; + + /* Abort requested by m2m */ + int aborting; + + struct v4l2_m2m_ctx *m2m_ctx; +}; + +struct m2mtest_buffer { + /* vb must be first! */ + struct videobuf_buffer vb; +}; + +static struct v4l2_queryctrl *get_ctrl(int id) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(m2mtest_ctrls); ++i) { + if (id == m2mtest_ctrls[i].id) + return &m2mtest_ctrls[i]; + } + + return NULL; +} + +static int device_process(struct m2mtest_ctx *ctx, + struct m2mtest_buffer *in_buf, + struct m2mtest_buffer *out_buf) +{ + struct m2mtest_dev *dev = ctx->dev; + u8 *p_in, *p_out; + int x, y, t, w; + int tile_w, bytes_left; + struct videobuf_queue *src_q; + struct videobuf_queue *dst_q; + + src_q = v4l2_m2m_get_src_vq(ctx->m2m_ctx); + dst_q = v4l2_m2m_get_dst_vq(ctx->m2m_ctx); + p_in = videobuf_queue_to_vaddr(src_q, &in_buf->vb); + p_out = videobuf_queue_to_vaddr(dst_q, &out_buf->vb); + if (!p_in || !p_out) { + v4l2_err(&dev->v4l2_dev, + "Acquiring kernel pointers to buffers failed\n"); + return -EFAULT; + } + + if (in_buf->vb.size < out_buf->vb.size) { + v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n"); + return -EINVAL; + } + + tile_w = (in_buf->vb.width * (q_data[V4L2_M2M_DST].fmt->depth >> 3)) + / MEM2MEM_NUM_TILES; + bytes_left = in_buf->vb.bytesperline - tile_w * MEM2MEM_NUM_TILES; + w = 0; + + for (y = 0; y < in_buf->vb.height; ++y) { + for (t = 0; t < MEM2MEM_NUM_TILES; ++t) { + if (w & 0x1) { + for (x = 0; x < tile_w; ++x) + *p_out++ = *p_in++ + MEM2MEM_COLOR_STEP; + } else { + for (x = 0; x < tile_w; ++x) + *p_out++ = *p_in++ - MEM2MEM_COLOR_STEP; + } + ++w; + } + p_in += bytes_left; + p_out += bytes_left; + } + + return 0; +} + +static void schedule_irq(struct m2mtest_dev *dev, int msec_timeout) +{ + dprintk(dev, "Scheduling a simulated irq\n"); + mod_timer(&dev->timer, jiffies + msecs_to_jiffies(msec_timeout)); +} + +/* + * mem2mem callbacks + */ + +/** + * job_ready() - check whether an instance is ready to be scheduled to run + */ +static int job_ready(void *priv) +{ + struct m2mtest_ctx *ctx = priv; + + if (v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx) < ctx->translen + || v4l2_m2m_num_dst_bufs_ready(ctx->m2m_ctx) < ctx->translen) { + dprintk(ctx->dev, "Not enough buffers available\n"); + return 0; + } + + return 1; +} + +static void job_abort(void *priv) +{ + struct m2mtest_ctx *ctx = priv; + + /* Will cancel the transaction in the next interrupt handler */ + ctx->aborting = 1; +} + +/* device_run() - prepares and starts the device + * + * This simulates all the immediate preparations required before starting + * a device. This will be called by the framework when it decides to schedule + * a particular instance. + */ +static void device_run(void *priv) +{ + struct m2mtest_ctx *ctx = priv; + struct m2mtest_dev *dev = ctx->dev; + struct m2mtest_buffer *src_buf, *dst_buf; + + src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx); + dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx); + + device_process(ctx, src_buf, dst_buf); + + /* Run a timer, which simulates a hardware irq */ + schedule_irq(dev, ctx->transtime); +} + + +static void device_isr(unsigned long priv) +{ + struct m2mtest_dev *m2mtest_dev = (struct m2mtest_dev *)priv; + struct m2mtest_ctx *curr_ctx; + struct m2mtest_buffer *src_buf, *dst_buf; + unsigned long flags; + + curr_ctx = v4l2_m2m_get_curr_priv(m2mtest_dev->m2m_dev); + + if (NULL == curr_ctx) { + printk(KERN_ERR + "Instance released before the end of transaction\n"); + return; + } + + src_buf = v4l2_m2m_src_buf_remove(curr_ctx->m2m_ctx); + dst_buf = v4l2_m2m_dst_buf_remove(curr_ctx->m2m_ctx); + curr_ctx->num_processed++; + + if (curr_ctx->num_processed == curr_ctx->translen + || curr_ctx->aborting) { + dprintk(curr_ctx->dev, "Finishing transaction\n"); + curr_ctx->num_processed = 0; + spin_lock_irqsave(&m2mtest_dev->irqlock, flags); + src_buf->vb.state = dst_buf->vb.state = VIDEOBUF_DONE; + wake_up(&src_buf->vb.done); + wake_up(&dst_buf->vb.done); + spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags); + v4l2_m2m_job_finish(m2mtest_dev->m2m_dev, curr_ctx->m2m_ctx); + } else { + spin_lock_irqsave(&m2mtest_dev->irqlock, flags); + src_buf->vb.state = dst_buf->vb.state = VIDEOBUF_DONE; + wake_up(&src_buf->vb.done); + wake_up(&dst_buf->vb.done); + spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags); + device_run(curr_ctx); + } +} + + +/* + * video ioctls + */ +static int vidioc_querycap(struct file *file, void *priv, + struct v4l2_capability *cap) +{ + strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1); + strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1); + cap->bus_info[0] = 0; + cap->version = KERNEL_VERSION(0, 1, 0); + cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT + | V4L2_CAP_STREAMING; + + return 0; +} + +static int enum_fmt(struct v4l2_fmtdesc *f, u32 type) +{ + int i, num; + struct m2mtest_fmt *fmt; + + num = 0; + + for (i = 0; i < NUM_FORMATS; ++i) { + if (formats[i].types & type) { + /* index-th format of type type found ? */ + if (num == f->index) + break; + /* Correct type but haven't reached our index yet, + * just increment per-type index */ + ++num; + } + } + + if (i < NUM_FORMATS) { + /* Format found */ + fmt = &formats[i]; + strncpy(f->description, fmt->name, sizeof(f->description) - 1); + f->pixelformat = fmt->fourcc; + return 0; + } + + /* Format not found */ + return -EINVAL; +} + +static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, + struct v4l2_fmtdesc *f) +{ + return enum_fmt(f, MEM2MEM_CAPTURE); +} + +static int vidioc_enum_fmt_vid_out(struct file *file, void *priv, + struct v4l2_fmtdesc *f) +{ + return enum_fmt(f, MEM2MEM_OUTPUT); +} + +static int vidioc_g_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f) +{ + struct videobuf_queue *vq; + struct m2mtest_q_data *q_data; + + vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type); + if (!vq) + return -EINVAL; + + q_data = get_q_data(f->type); + + f->fmt.pix.width = q_data->width; + f->fmt.pix.height = q_data->height; + f->fmt.pix.field = vq->field; + f->fmt.pix.pixelformat = q_data->fmt->fourcc; + f->fmt.pix.bytesperline = (q_data->width * q_data->fmt->depth) >> 3; + f->fmt.pix.sizeimage = q_data->sizeimage; + + return 0; +} + +static int vidioc_g_fmt_vid_out(struct file *file, void *priv, + struct v4l2_format *f) +{ + return vidioc_g_fmt(priv, f); +} + +static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, + struct v4l2_format *f) +{ + return vidioc_g_fmt(priv, f); +} + +static int vidioc_try_fmt(struct v4l2_format *f, struct m2mtest_fmt *fmt) +{ + enum v4l2_field field; + + field = f->fmt.pix.field; + + if (field == V4L2_FIELD_ANY) + field = V4L2_FIELD_NONE; + else if (V4L2_FIELD_NONE != field) + return -EINVAL; + + /* V4L2 specification suggests the driver corrects the format struct + * if any of the dimensions is unsupported */ + f->fmt.pix.field = field; + + if (f->fmt.pix.height < MIN_H) + f->fmt.pix.height = MIN_H; + else if (f->fmt.pix.height > MAX_H) + f->fmt.pix.height = MAX_H; + + if (f->fmt.pix.width < MIN_W) + f->fmt.pix.width = MIN_W; + else if (f->fmt.pix.width > MAX_W) + f->fmt.pix.width = MAX_W; + + f->fmt.pix.width &= ~DIM_ALIGN_MASK; + f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3; + f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline; + + return 0; +} + +static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, + struct v4l2_format *f) +{ + struct m2mtest_fmt *fmt; + struct m2mtest_ctx *ctx = priv; + + fmt = find_format(f); + if (!fmt || !(fmt->types & MEM2MEM_CAPTURE)) { + v4l2_err(&ctx->dev->v4l2_dev, + "Fourcc format (0x%08x) invalid.\n", + f->fmt.pix.pixelformat); + return -EINVAL; + } + + return vidioc_try_fmt(f, fmt); +} + +static int vidioc_try_fmt_vid_out(struct file *file, void *priv, + struct v4l2_format *f) +{ + struct m2mtest_fmt *fmt; + struct m2mtest_ctx *ctx = priv; + + fmt = find_format(f); + if (!fmt || !(fmt->types & MEM2MEM_OUTPUT)) { + v4l2_err(&ctx->dev->v4l2_dev, + "Fourcc format (0x%08x) invalid.\n", + f->fmt.pix.pixelformat); + return -EINVAL; + } + + return vidioc_try_fmt(f, fmt); +} + +static int vidioc_s_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f) +{ + struct m2mtest_q_data *q_data; + struct videobuf_queue *vq; + int ret = 0; + + vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type); + if (!vq) + return -EINVAL; + + q_data = get_q_data(f->type); + if (!q_data) + return -EINVAL; + + mutex_lock(&vq->vb_lock); + + if (videobuf_queue_is_busy(vq)) { + v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__); + ret = -EBUSY; + goto out; + } + + q_data->fmt = find_format(f); + q_data->width = f->fmt.pix.width; + q_data->height = f->fmt.pix.height; + q_data->sizeimage = q_data->width * q_data->height + * q_data->fmt->depth >> 3; + vq->field = f->fmt.pix.field; + + dprintk(ctx->dev, + "Setting format for type %d, wxh: %dx%d, fmt: %d\n", + f->type, q_data->width, q_data->height, q_data->fmt->fourcc); + +out: + mutex_unlock(&vq->vb_lock); + return ret; +} + +static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, + struct v4l2_format *f) +{ + int ret; + + ret = vidioc_try_fmt_vid_cap(file, priv, f); + if (ret) + return ret; + + return vidioc_s_fmt(priv, f); +} + +static int vidioc_s_fmt_vid_out(struct file *file, void *priv, + struct v4l2_format *f) +{ + int ret; + + ret = vidioc_try_fmt_vid_out(file, priv, f); + if (ret) + return ret; + + return vidioc_s_fmt(priv, f); +} + +static int vidioc_reqbufs(struct file *file, void *priv, + struct v4l2_requestbuffers *reqbufs) +{ + struct m2mtest_ctx *ctx = priv; + + return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs); +} + +static int vidioc_querybuf(struct file *file, void *priv, + struct v4l2_buffer *buf) +{ + struct m2mtest_ctx *ctx = priv; + + return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf); +} + +static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf) +{ + struct m2mtest_ctx *ctx = priv; + + return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf); +} + +static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf) +{ + struct m2mtest_ctx *ctx = priv; + + return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf); +} + +static int vidioc_streamon(struct file *file, void *priv, + enum v4l2_buf_type type) +{ + struct m2mtest_ctx *ctx = priv; + + return v4l2_m2m_streamon(file, ctx->m2m_ctx, type); +} + +static int vidioc_streamoff(struct file *file, void *priv, + enum v4l2_buf_type type) +{ + struct m2mtest_ctx *ctx = priv; + + return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type); +} + +static int vidioc_queryctrl(struct file *file, void *priv, + struct v4l2_queryctrl *qc) +{ + struct v4l2_queryctrl *c; + + c = get_ctrl(qc->id); + if (!c) + return -EINVAL; + + *qc = *c; + return 0; +} + +static int vidioc_g_ctrl(struct file *file, void *priv, + struct v4l2_control *ctrl) +{ + struct m2mtest_ctx *ctx = priv; + + switch (ctrl->id) { + case V4L2_CID_TRANS_TIME_MSEC: + ctrl->value = ctx->transtime; + break; + + case V4L2_CID_TRANS_NUM_BUFS: + ctrl->value = ctx->translen; + break; + + default: + v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n"); + return -EINVAL; + } + + return 0; +} + +static int check_ctrl_val(struct m2mtest_ctx *ctx, struct v4l2_control *ctrl) +{ + struct v4l2_queryctrl *c; + + c = get_ctrl(ctrl->id); + if (!c) + return -EINVAL; + + if (ctrl->value < c->minimum || ctrl->value > c->maximum) { + v4l2_err(&ctx->dev->v4l2_dev, "Value out of range\n"); + return -ERANGE; + } + + return 0; +} + +static int vidioc_s_ctrl(struct file *file, void *priv, + struct v4l2_control *ctrl) +{ + struct m2mtest_ctx *ctx = priv; + int ret = 0; + + ret = check_ctrl_val(ctx, ctrl); + if (ret != 0) + return ret; + + switch (ctrl->id) { + case V4L2_CID_TRANS_TIME_MSEC: + ctx->transtime = ctrl->value; + break; + + case V4L2_CID_TRANS_NUM_BUFS: + ctx->translen = ctrl->value; + break; + + default: + v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n"); + return -EINVAL; + } + + return 0; +} + + +static const struct v4l2_ioctl_ops m2mtest_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_enum_fmt_vid_out = vidioc_enum_fmt_vid_out, + .vidioc_g_fmt_vid_out = vidioc_g_fmt_vid_out, + .vidioc_try_fmt_vid_out = vidioc_try_fmt_vid_out, + .vidioc_s_fmt_vid_out = vidioc_s_fmt_vid_out, + + .vidioc_reqbufs = vidioc_reqbufs, + .vidioc_querybuf = vidioc_querybuf, + + .vidioc_qbuf = vidioc_qbuf, + .vidioc_dqbuf = vidioc_dqbuf, + + .vidioc_streamon = vidioc_streamon, + .vidioc_streamoff = vidioc_streamoff, + + .vidioc_queryctrl = vidioc_queryctrl, + .vidioc_g_ctrl = vidioc_g_ctrl, + .vidioc_s_ctrl = vidioc_s_ctrl, +}; + + +/* + * Queue operations + */ + +static void m2mtest_buf_release(struct videobuf_queue *vq, + struct videobuf_buffer *vb) +{ + struct m2mtest_ctx *ctx = vq->priv_data; + + dprintk(ctx->dev, "type: %d, index: %d, state: %d\n", + vq->type, vb->i, vb->state); + + videobuf_vmalloc_free(vb); + vb->state = VIDEOBUF_NEEDS_INIT; +} + +static int m2mtest_buf_setup(struct videobuf_queue *vq, unsigned int *count, + unsigned int *size) +{ + struct m2mtest_ctx *ctx = vq->priv_data; + struct m2mtest_q_data *q_data; + + q_data = get_q_data(vq->type); + + *size = q_data->width * q_data->height * q_data->fmt->depth >> 3; + dprintk(ctx->dev, "size:%d, w/h %d/%d, depth: %d\n", + *size, q_data->width, q_data->height, q_data->fmt->depth); + + if (0 == *count) + *count = MEM2MEM_DEF_NUM_BUFS; + + while (*size * *count > MEM2MEM_VID_MEM_LIMIT) + (*count)--; + + v4l2_info(&ctx->dev->v4l2_dev, + "%d buffers of size %d set up.\n", *count, *size); + + return 0; +} + +static int m2mtest_buf_prepare(struct videobuf_queue *vq, + struct videobuf_buffer *vb, + enum v4l2_field field) +{ + struct m2mtest_ctx *ctx = vq->priv_data; + struct m2mtest_q_data *q_data; + int ret; + + dprintk(ctx->dev, "type: %d, index: %d, state: %d\n", + vq->type, vb->i, vb->state); + + q_data = get_q_data(vq->type); + + if (vb->baddr) { + /* User-provided buffer */ + if (vb->bsize < q_data->sizeimage) { + /* Buffer too small to fit a frame */ + v4l2_err(&ctx->dev->v4l2_dev, + "User-provided buffer too small\n"); + return -EINVAL; + } + } else if (vb->state != VIDEOBUF_NEEDS_INIT + && vb->bsize < q_data->sizeimage) { + /* We provide the buffer, but it's already been initialized + * and is too small */ + return -EINVAL; + } + + vb->width = q_data->width; + vb->height = q_data->height; + vb->bytesperline = (q_data->width * q_data->fmt->depth) >> 3; + vb->size = q_data->sizeimage; + vb->field = field; + + if (VIDEOBUF_NEEDS_INIT == vb->state) { + ret = videobuf_iolock(vq, vb, NULL); + if (ret) { + v4l2_err(&ctx->dev->v4l2_dev, + "Iolock failed\n"); + goto fail; + } + } + + vb->state = VIDEOBUF_PREPARED; + + return 0; +fail: + m2mtest_buf_release(vq, vb); + return ret; +} + +static void m2mtest_buf_queue(struct videobuf_queue *vq, + struct videobuf_buffer *vb) +{ + struct m2mtest_ctx *ctx = vq->priv_data; + + v4l2_m2m_buf_queue(ctx->m2m_ctx, vq, vb); +} + +static struct videobuf_queue_ops m2mtest_qops = { + .buf_setup = m2mtest_buf_setup, + .buf_prepare = m2mtest_buf_prepare, + .buf_queue = m2mtest_buf_queue, + .buf_release = m2mtest_buf_release, +}; + +static void queue_init(void *priv, struct videobuf_queue *vq, + enum v4l2_buf_type type) +{ + struct m2mtest_ctx *ctx = priv; + + videobuf_queue_vmalloc_init(vq, &m2mtest_qops, ctx->dev->v4l2_dev.dev, + &ctx->dev->irqlock, type, V4L2_FIELD_NONE, + sizeof(struct m2mtest_buffer), priv); +} + + +/* + * File operations + */ +static int m2mtest_open(struct file *file) +{ + struct m2mtest_dev *dev = video_drvdata(file); + struct m2mtest_ctx *ctx = NULL; + + ctx = kzalloc(sizeof *ctx, GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + file->private_data = ctx; + ctx->dev = dev; + ctx->translen = MEM2MEM_DEF_TRANSLEN; + ctx->transtime = MEM2MEM_DEF_TRANSTIME; + ctx->num_processed = 0; + + ctx->m2m_ctx = v4l2_m2m_ctx_init(ctx, dev->m2m_dev, queue_init); + if (IS_ERR(ctx->m2m_ctx)) { + int ret = PTR_ERR(ctx->m2m_ctx); + + kfree(ctx); + return ret; + } + + atomic_inc(&dev->num_inst); + + dprintk(dev, "Created instance %p, m2m_ctx: %p\n", ctx, ctx->m2m_ctx); + + return 0; +} + +static int m2mtest_release(struct file *file) +{ + struct m2mtest_dev *dev = video_drvdata(file); + struct m2mtest_ctx *ctx = file->private_data; + + dprintk(dev, "Releasing instance %p\n", ctx); + + v4l2_m2m_ctx_release(ctx->m2m_ctx); + kfree(ctx); + + atomic_dec(&dev->num_inst); + + return 0; +} + +static unsigned int m2mtest_poll(struct file *file, + struct poll_table_struct *wait) +{ + struct m2mtest_ctx *ctx = (struct m2mtest_ctx *)file->private_data; + + return v4l2_m2m_poll(file, ctx->m2m_ctx, wait); +} + +static int m2mtest_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct m2mtest_ctx *ctx = (struct m2mtest_ctx *)file->private_data; + + return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma); +} + +static const struct v4l2_file_operations m2mtest_fops = { + .owner = THIS_MODULE, + .open = m2mtest_open, + .release = m2mtest_release, + .poll = m2mtest_poll, + .ioctl = video_ioctl2, + .mmap = m2mtest_mmap, +}; + +static struct video_device m2mtest_videodev = { + .name = MEM2MEM_NAME, + .fops = &m2mtest_fops, + .ioctl_ops = &m2mtest_ioctl_ops, + .minor = -1, + .release = video_device_release, +}; + +static struct v4l2_m2m_ops m2m_ops = { + .device_run = device_run, + .job_ready = job_ready, + .job_abort = job_abort, +}; + +static int m2mtest_probe(struct platform_device *pdev) +{ + struct m2mtest_dev *dev; + struct video_device *vfd; + int ret; + + dev = kzalloc(sizeof *dev, GFP_KERNEL); + if (!dev) + return -ENOMEM; + + spin_lock_init(&dev->irqlock); + + ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev); + if (ret) + goto free_dev; + + atomic_set(&dev->num_inst, 0); + mutex_init(&dev->dev_mutex); + + vfd = video_device_alloc(); + if (!vfd) { + v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n"); + ret = -ENOMEM; + goto unreg_dev; + } + + *vfd = m2mtest_videodev; + + ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0); + if (ret) { + v4l2_err(&dev->v4l2_dev, "Failed to register video device\n"); + goto rel_vdev; + } + + video_set_drvdata(vfd, dev); + snprintf(vfd->name, sizeof(vfd->name), "%s", m2mtest_videodev.name); + dev->vfd = vfd; + v4l2_info(&dev->v4l2_dev, MEM2MEM_TEST_MODULE_NAME + "Device registered as /dev/video%d\n", vfd->num); + + setup_timer(&dev->timer, device_isr, (long)dev); + platform_set_drvdata(pdev, dev); + + dev->m2m_dev = v4l2_m2m_init(&m2m_ops); + if (IS_ERR(dev->m2m_dev)) { + v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n"); + ret = PTR_ERR(dev->m2m_dev); + goto err_m2m; + } + + return 0; + +err_m2m: + video_unregister_device(dev->vfd); +rel_vdev: + video_device_release(vfd); +unreg_dev: + v4l2_device_unregister(&dev->v4l2_dev); +free_dev: + kfree(dev); + + return ret; +} + +static int m2mtest_remove(struct platform_device *pdev) +{ + struct m2mtest_dev *dev = + (struct m2mtest_dev *)platform_get_drvdata(pdev); + + v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_TEST_MODULE_NAME); + v4l2_m2m_release(dev->m2m_dev); + del_timer_sync(&dev->timer); + video_unregister_device(dev->vfd); + v4l2_device_unregister(&dev->v4l2_dev); + kfree(dev); + + return 0; +} + +static struct platform_driver m2mtest_pdrv = { + .probe = m2mtest_probe, + .remove = m2mtest_remove, + .driver = { + .name = MEM2MEM_NAME, + .owner = THIS_MODULE, + }, +}; + +static void __exit m2mtest_exit(void) +{ + platform_driver_unregister(&m2mtest_pdrv); + platform_device_unregister(&m2mtest_pdev); +} + +static int __init m2mtest_init(void) +{ + int ret; + + ret = platform_device_register(&m2mtest_pdev); + if (ret) + return ret; + + ret = platform_driver_register(&m2mtest_pdrv); + if (ret) + platform_device_unregister(&m2mtest_pdev); + + return 0; +} + +module_init(m2mtest_init); +module_exit(m2mtest_exit); + |