Audio memory to memory virtual driver use video memory to memory
virtual driver vim2m.c as example. The main difference is
device type is VFL_TYPE_AUDIO and device cap type is V4L2_CAP_AUDIO_M2M.
The device_run function is a dummy function, which is simply
copy the data from input buffer to output buffer.
Signed-off-by: Shengjiu Wang <shengjiu.w...@nxp.com>
---
drivers/media/test-drivers/Kconfig | 10 +
drivers/media/test-drivers/Makefile | 1 +
drivers/media/test-drivers/vim2m-audio.c | 793 +++++++++++++++++++++++
3 files changed, 804 insertions(+)
create mode 100644 drivers/media/test-drivers/vim2m-audio.c
diff --git a/drivers/media/test-drivers/Kconfig
b/drivers/media/test-drivers/Kconfig
index 5a5379524bde..b6b52a7ca042 100644
--- a/drivers/media/test-drivers/Kconfig
+++ b/drivers/media/test-drivers/Kconfig
@@ -16,6 +16,16 @@ config VIDEO_VIM2M
This is a virtual test device for the memory-to-memory driver
framework.
+config VIDEO_VIM2M_AUDIO
+ tristate "Virtual Memory-to-Memory Driver For Audio"
+ depends on VIDEO_DEV
+ select VIDEOBUF2_VMALLOC
+ select V4L2_MEM2MEM_DEV
+ select MEDIA_CONTROLLER
+ help
+ This is a virtual audio test device for the memory-to-memory driver
+ framework.
+
source "drivers/media/test-drivers/vicodec/Kconfig"
source "drivers/media/test-drivers/vimc/Kconfig"
source "drivers/media/test-drivers/vivid/Kconfig"
diff --git a/drivers/media/test-drivers/Makefile
b/drivers/media/test-drivers/Makefile
index 740714a4584d..0c61c9ada3e1 100644
--- a/drivers/media/test-drivers/Makefile
+++ b/drivers/media/test-drivers/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_DVB_VIDTV) += vidtv/
obj-$(CONFIG_VIDEO_VICODEC) += vicodec/
obj-$(CONFIG_VIDEO_VIM2M) += vim2m.o
+obj-$(CONFIG_VIDEO_VIM2M_AUDIO) += vim2m-audio.o
obj-$(CONFIG_VIDEO_VIMC) += vimc/
obj-$(CONFIG_VIDEO_VIVID) += vivid/
obj-$(CONFIG_VIDEO_VISL) += visl/
diff --git a/drivers/media/test-drivers/vim2m-audio.c
b/drivers/media/test-drivers/vim2m-audio.c
new file mode 100644
index 000000000000..6361df6320b3
--- /dev/null
+++ b/drivers/media/test-drivers/vim2m-audio.c
@@ -0,0 +1,793 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * A virtual v4l2-mem2mem example for audio device.
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/fs.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/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+#include <media/videobuf2-vmalloc.h>
+#include <sound/dmaengine_pcm.h>
+
+MODULE_DESCRIPTION("Virtual device for audio mem2mem testing");
+MODULE_LICENSE("GPL");
+
+static unsigned int debug;
+module_param(debug, uint, 0644);
+MODULE_PARM_DESC(debug, "debug level");
+
+#define MEM2MEM_NAME "vim2m-audio"
+
+#define dprintk(dev, lvl, fmt, arg...) \
+ v4l2_dbg(lvl, debug, &(dev)->v4l2_dev, "%s: " fmt, __func__, ## arg)
+
+#define SAMPLE_NUM 4096
+
+static void audm2m_dev_release(struct device *dev)
+{}
+
+static struct platform_device audm2m_pdev = {
+ .name = MEM2MEM_NAME,
+ .dev.release = audm2m_dev_release,
+};
+
+static u32 formats[] = {
+ V4L2_AUDIO_FMT_S16_LE,
+};
+
+#define NUM_FORMATS ARRAY_SIZE(formats)
+
+/* Per-queue, driver-specific private data */
+struct audm2m_q_data {
+ unsigned int rate;
+ unsigned int channels;
+ unsigned int buffersize;
+ unsigned int sequence;
+ u32 fourcc;
+};
+
+enum {
+ V4L2_M2M_SRC = 0,
+ V4L2_M2M_DST = 1,
+};
+
+static snd_pcm_format_t find_format(u32 fourcc)
+{
+ snd_pcm_format_t fmt;
+ unsigned int k;
+
+ for (k = 0; k < NUM_FORMATS; k++) {
+ if (formats[k] == fourcc)
+ break;
+ }
+
+ if (k == NUM_FORMATS)
+ return 0;
+
+ fmt = v4l2_fourcc_to_audfmt(formats[k]);
+
+ return fmt;
+}
+
+struct audm2m_dev {
+ struct v4l2_device v4l2_dev;
+ struct video_device vfd;
+
+ struct mutex dev_mutex;
+
+ struct v4l2_m2m_dev *m2m_dev;
+#ifdef CONFIG_MEDIA_CONTROLLER
+ struct media_device mdev;
+#endif
+};
+
+struct audm2m_ctx {
+ struct v4l2_fh fh;
+ struct v4l2_ctrl_handler ctrl_handler;
+ struct audm2m_dev *dev;
+
+ struct mutex vb_mutex;
+
+ /* Source and destination queue data */
+ struct audm2m_q_data q_data[2];
+};
+
+static inline struct audm2m_ctx *file2ctx(struct file *file)
+{
+ return container_of(file->private_data, struct audm2m_ctx, fh);
+}
+
+static struct audm2m_q_data *get_q_data(struct audm2m_ctx *ctx,
+ enum v4l2_buf_type type)
+{
+ if (type == V4L2_BUF_TYPE_AUDIO_OUTPUT)
+ return &ctx->q_data[V4L2_M2M_SRC];
+ return &ctx->q_data[V4L2_M2M_DST];
+}
+
+static const char *type_name(enum v4l2_buf_type type)
+{
+ if (type == V4L2_BUF_TYPE_AUDIO_OUTPUT)
+ return "Output";
+ return "Capture";
+}
+
+/*
+ * mem2mem callbacks
+ */
+
+/*
+ * device_run() - prepares and starts the device
+ */
+static void device_run(void *priv)
+{
+ struct audm2m_ctx *ctx = priv;
+ struct audm2m_dev *audm2m_dev;
+ struct vb2_v4l2_buffer *src_buf, *dst_buf;
+ struct audm2m_q_data *q_data_src, *q_data_dst;
+ int src_size, dst_size = 0;
+ short *src_addr, *dst_addr;
+ int i;
+
+ audm2m_dev = ctx->dev;
+
+ q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_AUDIO_OUTPUT);
+ if (!q_data_src)
+ return;
+
+ q_data_dst = get_q_data(ctx, V4L2_BUF_TYPE_AUDIO_CAPTURE);
+ if (!q_data_dst)
+ return;
+
+ src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
+ dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
+ src_buf->sequence = q_data_src->sequence++;
+ dst_buf->sequence = q_data_dst->sequence++;
+ v4l2_m2m_buf_copy_metadata(src_buf, dst_buf, false);
+
+ /* Process the conversion */
+ src_size = vb2_get_plane_payload(&src_buf->vb2_buf, 0);
+
+ src_addr = vb2_plane_vaddr(&src_buf->vb2_buf, 0);
+ dst_addr = vb2_plane_vaddr(&dst_buf->vb2_buf, 0);
+
+ if (q_data_src->rate == q_data_dst->rate) {
+ memcpy(dst_addr, src_addr, src_size);
+ dst_size = src_size;
+ } else if (q_data_src->rate == 2 * q_data_dst->rate) {
+ /* 8k to 16k */
+ for (i = 0; i < src_size / 2; i++) {
+ *dst_addr++ = *src_addr++;
+ src_addr++;
+ }
+
+ dst_size = src_size / 2;
+ } else if (q_data_src->rate * 2 == q_data_dst->rate) {
+ /* 16k to 8k */
+ for (i = 0; i < src_size / 2; i++) {
+ *dst_addr++ = *src_addr;
+ *dst_addr++ = *src_addr++;
+ }
+
+ dst_size = src_size * 2;
+ }
+
+ vb2_set_plane_payload(&dst_buf->vb2_buf, 0, dst_size);
+
+ src_buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
+ dst_buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
+
+ v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);
+ v4l2_m2m_buf_done(dst_buf, VB2_BUF_STATE_DONE);
+ v4l2_m2m_job_finish(audm2m_dev->m2m_dev, ctx->fh.m2m_ctx);
+}
+
+static int audm2m_querycap(struct file *file, void *priv,
+ struct v4l2_capability *cap)
+{
+ strscpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver));
+ strscpy(cap->card, MEM2MEM_NAME, sizeof(cap->card));
+
+ return 0;
+}
+
+static int enum_fmt(struct v4l2_fmtdesc *f)
+{
+ int i, num;
+
+ num = 0;
+
+ for (i = 0; i < NUM_FORMATS; ++i) {
+ 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 */
+ f->pixelformat = formats[i];
+ return 0;
+ }
+
+ /* Format not found */
+ return -EINVAL;
+}
+
+static int audm2m_enum_fmt_audio_cap(struct file *file, void *priv,
+ struct v4l2_fmtdesc *f)
+{
+ return enum_fmt(f);
+}
+
+static int audm2m_enum_fmt_audio_out(struct file *file, void *priv,
+ struct v4l2_fmtdesc *f)
+{
+ return enum_fmt(f);
+}
+
+static int audm2m_g_fmt(struct audm2m_ctx *ctx, struct v4l2_format *f)
+{
+ struct vb2_queue *vq;
+ struct audm2m_q_data *q_data;
+
+ vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
+ if (!vq)
+ return -EINVAL;
+
+ q_data = get_q_data(ctx, f->type);
+ if (!q_data)
+ return -EINVAL;
+
+ f->fmt.audio.audioformat = q_data->fourcc;
+ f->fmt.audio.channels = q_data->channels;
+ f->fmt.audio.buffersize = q_data->buffersize;
+
+ return 0;
+}
+
+static int audm2m_g_fmt_audio_out(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ return audm2m_g_fmt(file2ctx(file), f);
+}
+
+static int audm2m_g_fmt_audio_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ return audm2m_g_fmt(file2ctx(file), f);
+}
+
+static int audm2m_try_fmt(struct v4l2_format *f, snd_pcm_format_t fmt)
+{
+ f->fmt.audio.channels = 1;
+ f->fmt.audio.buffersize = f->fmt.audio.channels *
+ snd_pcm_format_physical_width(fmt) *
+ SAMPLE_NUM;
+ return 0;
+}
+
+static int audm2m_try_fmt_audio_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ snd_pcm_format_t fmt;
+
+ fmt = find_format(f->fmt.audio.audioformat);
+ if (!fmt) {
+ f->fmt.audio.audioformat = formats[0];
+ fmt = find_format(f->fmt.audio.audioformat);
+ }
+
+ return audm2m_try_fmt(f, fmt);
+}
+
+static int audm2m_try_fmt_audio_out(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ snd_pcm_format_t fmt;
+
+ fmt = find_format(f->fmt.audio.audioformat);
+ if (!fmt) {
+ f->fmt.audio.audioformat = formats[0];
+ fmt = find_format(f->fmt.audio.audioformat);
+ }
+
+ return audm2m_try_fmt(f, fmt);
+}
+
+static int audm2m_s_fmt(struct audm2m_ctx *ctx, struct v4l2_format *f)
+{
+ struct audm2m_q_data *q_data;
+ struct vb2_queue *vq;
+ snd_pcm_format_t fmt;
+
+ vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
+ if (!vq)
+ return -EINVAL;
+
+ q_data = get_q_data(ctx, f->type);
+ if (!q_data)
+ return -EINVAL;
+
+ if (vb2_is_busy(vq)) {
+ v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
+ return -EBUSY;
+ }
+
+ q_data->fourcc = f->fmt.audio.audioformat;
+ q_data->channels = f->fmt.audio.channels;
+
+ fmt = find_format(f->fmt.audio.audioformat);
+ q_data->buffersize = q_data->channels *
+ snd_pcm_format_physical_width(fmt) *
+ SAMPLE_NUM;
+
+ dprintk(ctx->dev, 1,
+ "Format for type %s: %d/%d, fmt: %c%c%c%c\n",
+ type_name(f->type), q_data->rate,
+ q_data->channels,
+ (q_data->fourcc & 0xff),
+ (q_data->fourcc >> 8) & 0xff,
+ (q_data->fourcc >> 16) & 0xff,
+ (q_data->fourcc >> 24) & 0xff);
+
+ return 0;
+}
+
+static int audm2m_s_fmt_audio_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ int ret;
+
+ ret = audm2m_try_fmt_audio_cap(file, priv, f);
+ if (ret)
+ return ret;
+
+ return audm2m_s_fmt(file2ctx(file), f);
+}
+
+static int audm2m_s_fmt_audio_out(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ int ret;
+
+ ret = audm2m_try_fmt_audio_out(file, priv, f);
+ if (ret)
+ return ret;
+
+ return audm2m_s_fmt(file2ctx(file), f);
+}
+
+static const struct v4l2_ioctl_ops audm2m_ioctl_ops = {
+ .vidioc_querycap = audm2m_querycap,
+
+ .vidioc_enum_fmt_audio_cap = audm2m_enum_fmt_audio_cap,
+ .vidioc_g_fmt_audio_cap = audm2m_g_fmt_audio_cap,
+ .vidioc_try_fmt_audio_cap = audm2m_try_fmt_audio_cap,
+ .vidioc_s_fmt_audio_cap = audm2m_s_fmt_audio_cap,
+
+ .vidioc_enum_fmt_audio_out = audm2m_enum_fmt_audio_out,
+ .vidioc_g_fmt_audio_out = audm2m_g_fmt_audio_out,
+ .vidioc_try_fmt_audio_out = audm2m_try_fmt_audio_out,
+ .vidioc_s_fmt_audio_out = audm2m_s_fmt_audio_out,
+
+ .vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs,
+ .vidioc_querybuf = v4l2_m2m_ioctl_querybuf,
+ .vidioc_qbuf = v4l2_m2m_ioctl_qbuf,
+ .vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf,
+ .vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf,
+ .vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs,
+ .vidioc_expbuf = v4l2_m2m_ioctl_expbuf,
+
+ .vidioc_streamon = v4l2_m2m_ioctl_streamon,
+ .vidioc_streamoff = v4l2_m2m_ioctl_streamoff,
+
+ .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+ .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+/*
+ * Queue operations
+ */
+static int audm2m_queue_setup(struct vb2_queue *vq,
+ unsigned int *nbuffers,
+ unsigned int *nplanes,
+ unsigned int sizes[],
+ struct device *alloc_devs[])
+{
+ struct audm2m_ctx *ctx = vb2_get_drv_priv(vq);
+ struct audm2m_q_data *q_data;
+
+ q_data = get_q_data(ctx, vq->type);
+
+ if (*nplanes)
+ return sizes[0] < q_data->buffersize ? -EINVAL : 0;
+
+ *nplanes = 1;
+ sizes[0] = q_data->buffersize;
+
+ dprintk(ctx->dev, 1, "%s: get %d buffer(s) of size %d each.\n",
+ type_name(vq->type), *nplanes, sizes[0]);
+
+ return 0;
+}
+
+static void audm2m_buf_queue(struct vb2_buffer *vb)
+{
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ struct audm2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+
+ v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
+}
+
+static int audm2m_start_streaming(struct vb2_queue *q, unsigned int count)
+{
+ struct audm2m_ctx *ctx = vb2_get_drv_priv(q);
+ struct audm2m_q_data *q_data = get_q_data(ctx, q->type);
+
+ q_data->sequence = 0;
+ return 0;
+}
+
+static void audm2m_stop_streaming(struct vb2_queue *q)
+{
+ struct audm2m_ctx *ctx = vb2_get_drv_priv(q);
+ struct vb2_v4l2_buffer *vbuf;
+
+ for (;;) {
+ if (V4L2_TYPE_IS_OUTPUT(q->type))
+ vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
+ else
+ vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
+ if (!vbuf)
+ return;
+ v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
+ }
+}
+
+static const struct vb2_ops audm2m_qops = {
+ .queue_setup = audm2m_queue_setup,
+ .buf_queue = audm2m_buf_queue,
+ .start_streaming = audm2m_start_streaming,
+ .stop_streaming = audm2m_stop_streaming,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+};
+
+static int queue_init(void *priv, struct vb2_queue *src_vq,
+ struct vb2_queue *dst_vq)
+{
+ struct audm2m_ctx *ctx = priv;
+ int ret;
+
+ src_vq->type = V4L2_BUF_TYPE_AUDIO_OUTPUT;
+ src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
+ src_vq->drv_priv = ctx;
+ src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
+ src_vq->ops = &audm2m_qops;
+ src_vq->mem_ops = &vb2_vmalloc_memops;
+ src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+ src_vq->lock = &ctx->vb_mutex;
+
+ ret = vb2_queue_init(src_vq);
+ if (ret)
+ return ret;
+
+ dst_vq->type = V4L2_BUF_TYPE_AUDIO_CAPTURE;
+ dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
+ dst_vq->drv_priv = ctx;
+ dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
+ dst_vq->ops = &audm2m_qops;
+ dst_vq->mem_ops = &vb2_vmalloc_memops;
+ dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+ dst_vq->lock = &ctx->vb_mutex;
+
+ return vb2_queue_init(dst_vq);
+}
+
+static const s64 audm2m_rates[] = {
+ 8000, 16000,
+};
+
+static int audm2m_op_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct audm2m_ctx *ctx =
+ container_of(ctrl->handler, struct audm2m_ctx, ctrl_handler);
+ int ret = 0;
+
+ switch (ctrl->id) {
+ case V4L2_CID_M2M_AUDIO_SOURCE_RATE:
+ ctx->q_data[V4L2_M2M_SRC].rate = ctrl->qmenu_int[ctrl->val];
+ break;
+ case V4L2_CID_M2M_AUDIO_DEST_RATE:
+ ctx->q_data[V4L2_M2M_DST].rate = ctrl->qmenu_int[ctrl->val];
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static const struct v4l2_ctrl_ops audm2m_ctrl_ops = {
+ .s_ctrl = audm2m_op_s_ctrl,
+};
+
+/*
+ * File operations
+ */
+static int audm2m_open(struct file *file)
+{
+ struct audm2m_dev *dev = video_drvdata(file);
+ struct audm2m_ctx *ctx = NULL;
+ snd_pcm_format_t fmt;
+ int width;
+ int rc = 0;
+
+ if (mutex_lock_interruptible(&dev->dev_mutex))
+ return -ERESTARTSYS;
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx) {
+ rc = -ENOMEM;
+ goto open_unlock;
+ }
+
+ v4l2_fh_init(&ctx->fh, video_devdata(file));
+ file->private_data = &ctx->fh;
+ ctx->dev = dev;
+
+ ctx->q_data[V4L2_M2M_SRC].fourcc = formats[0];
+ ctx->q_data[V4L2_M2M_SRC].rate = 8000;
+ ctx->q_data[V4L2_M2M_SRC].channels = 1;
+
+ /* Fix to 4096 samples */
+ fmt = find_format(formats[0]);
+ width = snd_pcm_format_physical_width(fmt);
+ ctx->q_data[V4L2_M2M_SRC].buffersize = SAMPLE_NUM * width;
+ ctx->q_data[V4L2_M2M_DST] = ctx->q_data[V4L2_M2M_SRC];
+
+ ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
+
+ mutex_init(&ctx->vb_mutex);
+
+ if (IS_ERR(ctx->fh.m2m_ctx)) {
+ rc = PTR_ERR(ctx->fh.m2m_ctx);
+
+ v4l2_fh_exit(&ctx->fh);
+ kfree(ctx);
+ goto open_unlock;
+ }
+
+ v4l2_fh_add(&ctx->fh);
+
+ dprintk(dev, 1, "Created instance: %p, m2m_ctx: %p\n",
+ ctx, ctx->fh.m2m_ctx);
+
+ v4l2_ctrl_handler_init(&ctx->ctrl_handler, 2);
+
+ v4l2_ctrl_new_int_menu(&ctx->ctrl_handler, &audm2m_ctrl_ops,
+ V4L2_CID_M2M_AUDIO_SOURCE_RATE,
+ ARRAY_SIZE(audm2m_rates) - 1, 0, audm2m_rates);
+ v4l2_ctrl_new_int_menu(&ctx->ctrl_handler, &audm2m_ctrl_ops,
+ V4L2_CID_M2M_AUDIO_DEST_RATE,
+ ARRAY_SIZE(audm2m_rates) - 1, 0, audm2m_rates);
+
+ if (ctx->ctrl_handler.error) {
+ rc = ctx->ctrl_handler.error;
+ v4l2_ctrl_handler_free(&ctx->ctrl_handler);
+ goto err_ctrl_handler;
+ }
+
+ ctx->fh.ctrl_handler = &ctx->ctrl_handler;
+
+ mutex_unlock(&dev->dev_mutex);
+
+ return 0;
+
+err_ctrl_handler:
+ v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
+open_unlock:
+ mutex_unlock(&dev->dev_mutex);
+ return rc;
+}
+
+static int audm2m_release(struct file *file)
+{
+ struct audm2m_dev *dev = video_drvdata(file);
+ struct audm2m_ctx *ctx = file2ctx(file);
+
+ dprintk(dev, 1, "Releasing instance %p\n", ctx);
+
+ v4l2_ctrl_handler_free(&ctx->ctrl_handler);
+ v4l2_fh_del(&ctx->fh);
+ v4l2_fh_exit(&ctx->fh);
+ mutex_lock(&dev->dev_mutex);
+ v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
+ mutex_unlock(&dev->dev_mutex);
+ kfree(ctx);
+
+ return 0;
+}
+
+static void audm2m_device_release(struct video_device *vdev)
+{
+ struct audm2m_dev *dev = container_of(vdev, struct audm2m_dev, vfd);
+
+ v4l2_device_unregister(&dev->v4l2_dev);
+ v4l2_m2m_release(dev->m2m_dev);
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+ media_device_cleanup(&dev->mdev);
+#endif
+ kfree(dev);
+}
+
+static const struct v4l2_file_operations audm2m_fops = {
+ .owner = THIS_MODULE,
+ .open = audm2m_open,
+ .release = audm2m_release,
+ .poll = v4l2_m2m_fop_poll,
+ .unlocked_ioctl = video_ioctl2,
+ .mmap = v4l2_m2m_fop_mmap,
+};
+
+static const struct video_device audm2m_videodev = {
+ .name = MEM2MEM_NAME,
+ .vfl_dir = VFL_DIR_M2M,
+ .fops = &audm2m_fops,
+ .ioctl_ops = &audm2m_ioctl_ops,
+ .minor = -1,
+ .release = audm2m_device_release,
+ .device_caps = V4L2_CAP_AUDIO_M2M | V4L2_CAP_STREAMING,
+};
+
+static const struct v4l2_m2m_ops m2m_ops = {
+ .device_run = device_run,
+};
+
+static const struct media_device_ops audm2m_media_ops = {
+ .req_validate = vb2_request_validate,
+ .req_queue = v4l2_m2m_request_queue,
+};
+
+static int audm2m_probe(struct platform_device *pdev)
+{
+ struct audm2m_dev *dev;
+ struct video_device *vfd;
+ int ret;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
+ if (ret)
+ goto error_free;
+
+ mutex_init(&dev->dev_mutex);
+
+ dev->vfd = audm2m_videodev;
+ vfd = &dev->vfd;
+ vfd->lock = &dev->dev_mutex;
+ vfd->v4l2_dev = &dev->v4l2_dev;
+
+ video_set_drvdata(vfd, 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);
+ dev->m2m_dev = NULL;
+ goto error_dev;
+ }
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+ dev->mdev.dev = &pdev->dev;
+ strscpy(dev->mdev.model, MEM2MEM_NAME, sizeof(dev->mdev.model));
+ media_device_init(&dev->mdev);
+ dev->mdev.ops = &audm2m_media_ops;
+ dev->v4l2_dev.mdev = &dev->mdev;
+#endif
+
+ ret = video_register_device(vfd, VFL_TYPE_AUDIO, 0);
+ if (ret) {
+ v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
+ goto error_m2m;
+ }
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+ ret = v4l2_m2m_register_media_controller(dev->m2m_dev, vfd,
+
MEDIA_ENT_F_PROC_AUDIO_RESAMPLER);
+ if (ret) {
+ v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem media
controller\n");
+ goto error_v4l2;
+ }
+
+ ret = media_device_register(&dev->mdev);
+ if (ret) {
+ v4l2_err(&dev->v4l2_dev, "Failed to register mem2mem media
device\n");
+ goto error_m2m_mc;
+ }
+#endif
+
+ v4l2_info(&dev->v4l2_dev,
+ "Device registered as /dev/v4l-audio%d\n", vfd->num);
+
+ return 0;
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+error_m2m_mc:
+ v4l2_m2m_unregister_media_controller(dev->m2m_dev);
+#endif
+error_v4l2:
+ video_unregister_device(&dev->vfd);
+ /* audm2m_device_release called by video_unregister_device to release
various objects */
+ return ret;
+error_m2m:
+ v4l2_m2m_release(dev->m2m_dev);
+error_dev:
+ v4l2_device_unregister(&dev->v4l2_dev);
+error_free:
+ kfree(dev);
+
+ return ret;
+}
+
+static void audm2m_remove(struct platform_device *pdev)
+{
+ struct audm2m_dev *dev = platform_get_drvdata(pdev);
+
+ v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_NAME);
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+ media_device_unregister(&dev->mdev);
+ v4l2_m2m_unregister_media_controller(dev->m2m_dev);
+#endif
+ video_unregister_device(&dev->vfd);
+}
+
+static struct platform_driver audm2m_pdrv = {
+ .probe = audm2m_probe,
+ .remove_new = audm2m_remove,
+ .driver = {
+ .name = MEM2MEM_NAME,
+ },
+};
+
+static void __exit audm2m_exit(void)
+{
+ platform_driver_unregister(&audm2m_pdrv);
+ platform_device_unregister(&audm2m_pdev);
+}
+
+static int __init audm2m_init(void)
+{
+ int ret;
+
+ ret = platform_device_register(&audm2m_pdev);
+ if (ret)
+ return ret;
+
+ ret = platform_driver_register(&audm2m_pdrv);
+ if (ret)
+ platform_device_unregister(&audm2m_pdev);
+
+ return ret;
+}
+
+module_init(audm2m_init);
+module_exit(audm2m_exit);
--
2.34.1
