Re: [PATCH v11 14/15] media: imx-asrc: Add memory to memory driver
From: Hans Verkuil
Date: Wed Jan 17 2024 - 05:31:49 EST
Some small comments:
On 22/11/2023 08:23, Shengjiu Wang wrote:
> Implement the ASRC memory to memory function using
> the v4l2 framework, user can use this function with
> v4l2 ioctl interface.
>
> User send the output and capture buffer to driver and
> driver store the converted data to the capture buffer.
>
> This feature can be shared by ASRC and EASRC drivers
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
> ---
> drivers/media/platform/nxp/Kconfig | 13 +
> drivers/media/platform/nxp/Makefile | 1 +
> drivers/media/platform/nxp/imx-asrc.c | 1264 +++++++++++++++++++++++++
> 3 files changed, 1278 insertions(+)
> create mode 100644 drivers/media/platform/nxp/imx-asrc.c
>
> diff --git a/drivers/media/platform/nxp/Kconfig b/drivers/media/platform/nxp/Kconfig
> index 40e3436669e2..8d0ca335601f 100644
> --- a/drivers/media/platform/nxp/Kconfig
> +++ b/drivers/media/platform/nxp/Kconfig
> @@ -67,3 +67,16 @@ config VIDEO_MX2_EMMAPRP
>
> source "drivers/media/platform/nxp/dw100/Kconfig"
> source "drivers/media/platform/nxp/imx-jpeg/Kconfig"
> +
> +config VIDEO_IMX_ASRC
> + tristate "NXP i.MX ASRC M2M support"
> + depends on V4L_MEM2MEM_DRIVERS
> + depends on MEDIA_SUPPORT
> + select VIDEOBUF2_DMA_CONTIG
> + select V4L2_MEM2MEM_DEV
> + select MEDIA_CONTROLLER
> + help
> + Say Y if you want to add ASRC M2M support for NXP CPUs.
> + It is a complement for ASRC M2P and ASRC P2M features.
> + This option is only useful for out-of-tree drivers since
> + in-tree drivers select it automatically.
> diff --git a/drivers/media/platform/nxp/Makefile b/drivers/media/platform/nxp/Makefile
> index 4d90eb713652..1325675e34f5 100644
> --- a/drivers/media/platform/nxp/Makefile
> +++ b/drivers/media/platform/nxp/Makefile
> @@ -9,3 +9,4 @@ obj-$(CONFIG_VIDEO_IMX8MQ_MIPI_CSI2) += imx8mq-mipi-csi2.o
> obj-$(CONFIG_VIDEO_IMX_MIPI_CSIS) += imx-mipi-csis.o
> obj-$(CONFIG_VIDEO_IMX_PXP) += imx-pxp.o
> obj-$(CONFIG_VIDEO_MX2_EMMAPRP) += mx2_emmaprp.o
> +obj-$(CONFIG_VIDEO_IMX_ASRC) += imx-asrc.o
> diff --git a/drivers/media/platform/nxp/imx-asrc.c b/drivers/media/platform/nxp/imx-asrc.c
> new file mode 100644
> index 000000000000..db4d45d5ba59
> --- /dev/null
> +++ b/drivers/media/platform/nxp/imx-asrc.c
> @@ -0,0 +1,1264 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Copyright (C) 2014-2016 Freescale Semiconductor, Inc.
> +// Copyright (C) 2019-2023 NXP
> +//
> +// Freescale ASRC Memory to Memory (M2M) driver
> +
> +#include <linux/dma/imx-dma.h>
> +#include <linux/pm_runtime.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-fh.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-mem2mem.h>
> +#include <media/videobuf2-dma-contig.h>
> +#include <sound/dmaengine_pcm.h>
> +#include <sound/fsl_asrc_common.h>
> +
> +#define V4L_CAP OUT
> +#define V4L_OUT IN
> +
> +#define ASRC_xPUT_DMA_CALLBACK(dir) \
> + (((dir) == V4L_OUT) ? asrc_input_dma_callback \
> + : asrc_output_dma_callback)
> +
> +#define DIR_STR(dir) (dir) == V4L_OUT ? "out" : "cap"
> +
> +/* Maximum output and capture buffer size */
> +#define ASRC_M2M_BUFFER_SIZE (512 * 1024)
> +
> +/* Maximum output and capture period size */
> +#define ASRC_M2M_PERIOD_SIZE (48 * 1024)
> +
> +struct asrc_pair_m2m {
> + struct fsl_asrc_pair *pair;
> + struct asrc_m2m *m2m;
> + struct v4l2_fh fh;
> + struct v4l2_ctrl_handler ctrl_handler;
> + int channels[2];
> + unsigned int sequence[2];
> + s64 src_rate_off_prev; /* Q31.32 */
> + s64 dst_rate_off_prev; /* Q31.32 */
> + s64 src_rate_off_cur; /* Q31.32 */
> + s64 dst_rate_off_cur; /* Q31.32 */
> +};
> +
> +struct asrc_m2m {
> + struct fsl_asrc_m2m_pdata pdata;
> + struct v4l2_device v4l2_dev;
> + struct v4l2_m2m_dev *m2m_dev;
> + struct video_device *dec_vdev;
> + struct mutex mlock; /* v4l2 ioctls serialization */
> + struct platform_device *pdev;
> +#ifdef CONFIG_MEDIA_CONTROLLER
> + struct media_device mdev;
> +#endif
> +};
> +
> +static u32 formats[] = {
> + V4L2_AUDIO_FMT_S8,
> + V4L2_AUDIO_FMT_S16_LE,
> + V4L2_AUDIO_FMT_U16_LE,
> + V4L2_AUDIO_FMT_S24_LE,
> + V4L2_AUDIO_FMT_S24_3LE,
> + V4L2_AUDIO_FMT_U24_LE,
> + V4L2_AUDIO_FMT_U24_3LE,
> + V4L2_AUDIO_FMT_S32_LE,
> + V4L2_AUDIO_FMT_U32_LE,
> + V4L2_AUDIO_FMT_S20_3LE,
> + V4L2_AUDIO_FMT_U20_3LE,
> + V4L2_AUDIO_FMT_FLOAT_LE,
> + V4L2_AUDIO_FMT_IEC958_SUBFRAME_LE,
> +};
> +
> +#define NUM_FORMATS ARRAY_SIZE(formats)
> +
> +static const s64 asrc_v1_m2m_rates[] = {
> + 5512, 8000, 11025, 12000, 16000,
> + 22050, 24000, 32000, 44100,
> + 48000, 64000, 88200, 96000,
> + 128000, 176400, 192000,
> +};
> +
> +static const s64 asrc_v2_m2m_rates[] = {
> + 8000, 11025, 12000, 16000,
> + 22050, 24000, 32000, 44100,
> + 48000, 64000, 88200, 96000,
> + 128000, 176400, 192000, 256000,
> + 352800, 384000, 705600, 768000,
> +};
> +
> +static u32 find_fourcc(snd_pcm_format_t format)
> +{
> + snd_pcm_format_t fmt;
> + unsigned int k;
> +
> + for (k = 0; k < NUM_FORMATS; k++) {
> + fmt = v4l2_fourcc_to_audfmt(formats[k]);
> + if (fmt == format)
> + return formats[k];
> + }
> +
> + return 0;
> +}
> +
> +static snd_pcm_format_t find_format(u32 fourcc)
> +{
> + unsigned int k;
> +
> + for (k = 0; k < NUM_FORMATS; k++) {
> + if (formats[k] == fourcc)
> + return v4l2_fourcc_to_audfmt(formats[k]);
> + }
> +
> + return 0;
> +}
> +
> +static int asrc_check_format(struct asrc_pair_m2m *pair_m2m, u8 dir, u32 format)
> +{
> + struct asrc_m2m *m2m = pair_m2m->m2m;
> + struct fsl_asrc_m2m_pdata *pdata = &m2m->pdata;
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> + snd_pcm_format_t fmt;
> + u64 format_bit = 0;
> + int i;
> +
> + for (i = 0; i < NUM_FORMATS; ++i) {
> + if (formats[i] == format) {
> + fmt = v4l2_fourcc_to_audfmt(formats[i]);
> + format_bit = pcm_format_to_bits(fmt);
> + break;
> + }
> + }
> +
> + if (dir == IN && !(format_bit & pdata->fmt_in))
> + return find_fourcc(pair->sample_format[V4L_OUT]);
> + if (dir == OUT && !(format_bit & pdata->fmt_out))
> + return find_fourcc(pair->sample_format[V4L_CAP]);
> +
> + return format;
> +}
> +
> +static int asrc_check_channel(struct asrc_pair_m2m *pair_m2m, u8 dir, u32 channels)
> +{
> + struct asrc_m2m *m2m = pair_m2m->m2m;
> + struct fsl_asrc_m2m_pdata *pdata = &m2m->pdata;
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> +
> + if (channels < pdata->chan_min || channels > pdata->chan_max)
> + return pair->channels;
> +
> + return channels;
> +}
> +
> +static inline struct asrc_pair_m2m *asrc_m2m_fh_to_ctx(struct v4l2_fh *fh)
> +{
> + return container_of(fh, struct asrc_pair_m2m, fh);
> +}
> +
> +/**
> + * asrc_read_last_fifo: read all the remaining data from FIFO
> + * @pair: Structure pointer of fsl_asrc_pair
> + * @dma_vaddr: virtual address of capture buffer
> + * @length: payload length of capture buffer
> + */
> +static void asrc_read_last_fifo(struct fsl_asrc_pair *pair, void *dma_vaddr, u32 *length)
> +{
> + struct fsl_asrc *asrc = pair->asrc;
> + enum asrc_pair_index index = pair->index;
> + u32 i, reg, size, t_size = 0, width;
> + u32 *reg32 = NULL;
> + u16 *reg16 = NULL;
> + u8 *reg24 = NULL;
> +
> + width = snd_pcm_format_physical_width(pair->sample_format[V4L_CAP]);
> + if (width == 32)
> + reg32 = dma_vaddr + *length;
> + else if (width == 16)
> + reg16 = dma_vaddr + *length;
> + else
> + reg24 = dma_vaddr + *length;
> +retry:
> + size = asrc->get_output_fifo_size(pair);
> + if (size + *length > ASRC_M2M_BUFFER_SIZE)
> + goto end;
> +
> + for (i = 0; i < size * pair->channels; i++) {
> + regmap_read(asrc->regmap, asrc->get_fifo_addr(OUT, index), ®);
> + if (reg32) {
> + *reg32++ = reg;
> + } else if (reg16) {
> + *reg16++ = (u16)reg;
> + } else {
> + *reg24++ = (u8)reg;
> + *reg24++ = (u8)(reg >> 8);
> + *reg24++ = (u8)(reg >> 16);
> + }
> + }
> + t_size += size;
> +
> + /* In case there is data left in FIFO */
> + if (size)
> + goto retry;
> +end:
> + /* Update payload length */
> + if (reg32)
> + *length += t_size * pair->channels * 4;
> + else if (reg16)
> + *length += t_size * pair->channels * 2;
> + else
> + *length += t_size * pair->channels * 3;
> +}
> +
> +static int asrc_m2m_start_streaming(struct vb2_queue *q, unsigned int count)
> +{
> + struct asrc_pair_m2m *pair_m2m = vb2_get_drv_priv(q);
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> + struct asrc_m2m *m2m = pair_m2m->m2m;
> + struct fsl_asrc *asrc = pair->asrc;
> + struct device *dev = &m2m->pdev->dev;
> + struct vb2_v4l2_buffer *buf;
> + bool request_flag = false;
> + int ret;
> +
> + dev_dbg(dev, "Start streaming pair=%p, %d\n", pair, q->type);
> +
> + ret = pm_runtime_get_sync(dev);
> + if (ret < 0) {
> + dev_err(dev, "Failed to power up asrc\n");
> + goto err_pm_runtime;
> + }
> +
> + /* Request asrc pair/context */
> + if (!pair->req_pair) {
> + /* flag for error handler of this function */
> + request_flag = true;
> +
> + ret = asrc->request_pair(pair->channels, pair);
> + if (ret) {
> + dev_err(dev, "failed to request pair: %d\n", ret);
> + goto err_request_pair;
> + }
> +
> + ret = asrc->m2m_prepare(pair);
> + if (ret) {
> + dev_err(dev, "failed to start pair part one: %d\n", ret);
> + goto err_start_part_one;
> + }
> +
> + pair->req_pair = true;
> + }
> +
> + /* Request dma channels */
> + if (V4L2_TYPE_IS_OUTPUT(q->type)) {
> + pair_m2m->sequence[V4L_OUT] = 0;
> + pair->dma_chan[V4L_OUT] = asrc->get_dma_channel(pair, IN);
> + if (!pair->dma_chan[V4L_OUT]) {
> + dev_err(dev, "[ctx%d] failed to get input DMA channel\n", pair->index);
> + ret = -EBUSY;
> + goto err_dma_channel;
> + }
> + } else {
> + pair_m2m->sequence[V4L_CAP] = 0;
> + pair->dma_chan[V4L_CAP] = asrc->get_dma_channel(pair, OUT);
> + if (!pair->dma_chan[V4L_CAP]) {
> + dev_err(dev, "[ctx%d] failed to get output DMA channel\n", pair->index);
> + ret = -EBUSY;
> + goto err_dma_channel;
> + }
> + }
> +
> + v4l2_m2m_update_start_streaming_state(pair_m2m->fh.m2m_ctx, q);
> +
> + return 0;
> +
> +err_dma_channel:
> + if (request_flag && asrc->m2m_unprepare)
> + asrc->m2m_unprepare(pair);
> +err_start_part_one:
> + if (request_flag)
> + asrc->release_pair(pair);
> +err_request_pair:
> + pm_runtime_put_sync(dev);
> +err_pm_runtime:
> + /* Release buffers */
> + if (V4L2_TYPE_IS_OUTPUT(q->type)) {
> + while ((buf = v4l2_m2m_src_buf_remove(pair_m2m->fh.m2m_ctx)))
> + v4l2_m2m_buf_done(buf, VB2_BUF_STATE_QUEUED);
> + } else {
> + while ((buf = v4l2_m2m_dst_buf_remove(pair_m2m->fh.m2m_ctx)))
> + v4l2_m2m_buf_done(buf, VB2_BUF_STATE_QUEUED);
> + }
> + return ret;
> +}
> +
> +static void asrc_m2m_stop_streaming(struct vb2_queue *q)
> +{
> + struct asrc_pair_m2m *pair_m2m = vb2_get_drv_priv(q);
> + struct asrc_m2m *m2m = pair_m2m->m2m;
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> + struct fsl_asrc *asrc = pair->asrc;
> + struct device *dev = &m2m->pdev->dev;
> +
> + dev_dbg(dev, "Stop streaming pair=%p, %d\n", pair, q->type);
> +
> + v4l2_m2m_update_stop_streaming_state(pair_m2m->fh.m2m_ctx, q);
> +
> + /* Stop & release pair/context */
> + if (asrc->m2m_stop)
> + asrc->m2m_stop(pair);
> +
> + if (pair->req_pair) {
> + if (asrc->m2m_unprepare)
> + asrc->m2m_unprepare(pair);
> + asrc->release_pair(pair);
> + pair->req_pair = false;
> + }
> +
> + /* Release dma channel */
> + if (V4L2_TYPE_IS_OUTPUT(q->type)) {
> + if (pair->dma_chan[V4L_OUT])
> + dma_release_channel(pair->dma_chan[V4L_OUT]);
> + } else {
> + if (pair->dma_chan[V4L_CAP])
> + dma_release_channel(pair->dma_chan[V4L_CAP]);
> + }
> +
> + pm_runtime_put_sync(dev);
> +}
> +
> +static int asrc_m2m_queue_setup(struct vb2_queue *q,
> + unsigned int *num_buffers, unsigned int *num_planes,
> + unsigned int sizes[], struct device *alloc_devs[])
> +{
> + struct asrc_pair_m2m *pair_m2m = vb2_get_drv_priv(q);
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> + u32 size;
> +
> + /*
> + * The capture buffer size depends on output buffer size
> + * and the convert ratio.
> + *
> + * Here just use a fix length for capture and output buffer.
> + * User need to care about it.
> + */
> + if (V4L2_TYPE_IS_OUTPUT(q->type))
> + size = pair->buf_len[V4L_OUT];
> + else
> + size = pair->buf_len[V4L_CAP];
> +
> + if (*num_planes)
> + return sizes[0] < size ? -EINVAL : 0;
> +
> + *num_planes = 1;
> + sizes[0] = size;
> +
> + return 0;
> +}
> +
> +static void asrc_m2m_buf_queue(struct vb2_buffer *vb)
> +{
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct asrc_pair_m2m *pair_m2m = vb2_get_drv_priv(vb->vb2_queue);
> +
> + /* queue buffer */
> + v4l2_m2m_buf_queue(pair_m2m->fh.m2m_ctx, vbuf);
> +}
> +
> +static const struct vb2_ops asrc_m2m_qops = {
> + .wait_prepare = vb2_ops_wait_prepare,
> + .wait_finish = vb2_ops_wait_finish,
> + .start_streaming = asrc_m2m_start_streaming,
> + .stop_streaming = asrc_m2m_stop_streaming,
> + .queue_setup = asrc_m2m_queue_setup,
> + .buf_queue = asrc_m2m_buf_queue,
> +};
> +
> +/* Init video buffer queue for src and dst. */
> +static int asrc_m2m_queue_init(void *priv, struct vb2_queue *src_vq,
> + struct vb2_queue *dst_vq)
> +{
> + struct asrc_pair_m2m *pair_m2m = priv;
> + struct asrc_m2m *m2m = pair_m2m->m2m;
> + int ret;
> +
> + src_vq->type = V4L2_BUF_TYPE_AUDIO_OUTPUT;
> + src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> + src_vq->drv_priv = pair_m2m;
> + src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
> + src_vq->ops = &asrc_m2m_qops;
> + src_vq->mem_ops = &vb2_dma_contig_memops;
> + src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> + src_vq->lock = &m2m->mlock;
> + src_vq->dev = &m2m->pdev->dev;
> + src_vq->min_buffers_needed = 1;
Drop this line, it is not needed.
> +
> + 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 = pair_m2m;
> + dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
> + dst_vq->ops = &asrc_m2m_qops;
> + dst_vq->mem_ops = &vb2_dma_contig_memops;
> + dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> + dst_vq->lock = &m2m->mlock;
> + dst_vq->dev = &m2m->pdev->dev;
> + dst_vq->min_buffers_needed = 1;
Ditto.
> +
> + ret = vb2_queue_init(dst_vq);
> + return ret;
> +}
> +
> +static int asrc_m2m_op_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct asrc_pair_m2m *pair_m2m =
> + container_of(ctrl->handler, struct asrc_pair_m2m, ctrl_handler);
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> + int ret = 0;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_M2M_AUDIO_SOURCE_RATE:
> + pair->rate[V4L_OUT] = ctrl->qmenu_int[ctrl->val];
> + break;
> + case V4L2_CID_M2M_AUDIO_DEST_RATE:
> + pair->rate[V4L_CAP] = ctrl->qmenu_int[ctrl->val];
> + break;
> + case V4L2_CID_M2M_AUDIO_SOURCE_RATE_OFFSET:
> + pair_m2m->src_rate_off_cur = *ctrl->p_new.p_s64;
> + break;
> + case V4L2_CID_M2M_AUDIO_DEST_RATE_OFFSET:
> + pair_m2m->dst_rate_off_cur = *ctrl->p_new.p_s64;
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops asrc_m2m_ctrl_ops = {
> + .s_ctrl = asrc_m2m_op_s_ctrl,
> +};
> +
> +static const struct v4l2_ctrl_config asrc_src_rate_off_control = {
> + .ops = &asrc_m2m_ctrl_ops,
> + .id = V4L2_CID_M2M_AUDIO_SOURCE_RATE_OFFSET,
> + .name = "Audio Source Sample Rate Offset",
> + .type = V4L2_CTRL_TYPE_INTEGER64,
> + .min = v4l2_ctrl_fp_compose(-128, 0, 32),
> + .max = v4l2_ctrl_fp_compose(127, 0xffffffff, 32),
> + .def = 0,
> + .step = 1,
> + .flags = V4L2_CTRL_FLAG_UPDATE,
I don't think you need this flag. Or did I miss something?
> + .fraction_bits = 32,
> +};
> +
> +static const struct v4l2_ctrl_config asrc_dst_rate_off_control = {
> + .ops = &asrc_m2m_ctrl_ops,
> + .id = V4L2_CID_M2M_AUDIO_DEST_RATE_OFFSET,
> + .name = "Audio Dest Sample Rate Offset",
> + .type = V4L2_CTRL_TYPE_INTEGER64,
> + .min = v4l2_ctrl_fp_compose(-128, 0, 32),
> + .max = v4l2_ctrl_fp_compose(127, 0xffffffff, 32),
> + .def = 0,
> + .step = 1,
> + .flags = V4L2_CTRL_FLAG_UPDATE,
Ditto.
> + .fraction_bits = 32,
> +};
> +
> +/* system callback for open() */
> +static int asrc_m2m_open(struct file *file)
> +{
> + struct asrc_m2m *m2m = video_drvdata(file);
> + struct fsl_asrc *asrc = m2m->pdata.asrc;
> + struct video_device *vdev = video_devdata(file);
> + struct fsl_asrc_pair *pair;
> + struct asrc_pair_m2m *pair_m2m;
> + int ret = 0;
> +
> + if (mutex_lock_interruptible(&m2m->mlock))
> + return -ERESTARTSYS;
> +
> + pair = kzalloc(sizeof(*pair) + asrc->pair_priv_size, GFP_KERNEL);
> + if (!pair) {
> + ret = -ENOMEM;
> + goto err_alloc_pair;
> + }
> +
> + pair_m2m = kzalloc(sizeof(*pair_m2m), GFP_KERNEL);
> + if (!pair_m2m) {
> + ret = -ENOMEM;
> + goto err_alloc_pair_m2m;
> + }
> +
> + pair->private = (void *)pair + sizeof(struct fsl_asrc_pair);
> + pair->asrc = asrc;
> +
> + pair->buf_len[V4L_OUT] = ASRC_M2M_BUFFER_SIZE;
> + pair->buf_len[V4L_CAP] = ASRC_M2M_BUFFER_SIZE;
> +
> + pair->channels = 2;
> + pair->rate[V4L_OUT] = 8000;
> + pair->rate[V4L_CAP] = 8000;
> + pair->sample_format[V4L_OUT] = SNDRV_PCM_FORMAT_S16_LE;
> + pair->sample_format[V4L_CAP] = SNDRV_PCM_FORMAT_S16_LE;
> +
> + init_completion(&pair->complete[V4L_OUT]);
> + init_completion(&pair->complete[V4L_CAP]);
> +
> + v4l2_fh_init(&pair_m2m->fh, vdev);
> + v4l2_fh_add(&pair_m2m->fh);
> + file->private_data = &pair_m2m->fh;
> +
> + pair_m2m->pair = pair;
> + pair_m2m->m2m = m2m;
> + /* m2m context init */
> + pair_m2m->fh.m2m_ctx = v4l2_m2m_ctx_init(m2m->m2m_dev, pair_m2m,
> + asrc_m2m_queue_init);
> + if (IS_ERR(pair_m2m->fh.m2m_ctx)) {
> + ret = PTR_ERR(pair_m2m->fh.m2m_ctx);
> + goto err_ctx_init;
> + }
> +
> + v4l2_ctrl_handler_init(&pair_m2m->ctrl_handler, 4);
> +
> + if (m2m->pdata.rate_min == 5512) {
> + v4l2_ctrl_new_int_menu(&pair_m2m->ctrl_handler, &asrc_m2m_ctrl_ops,
> + V4L2_CID_M2M_AUDIO_SOURCE_RATE,
> + ARRAY_SIZE(asrc_v1_m2m_rates) - 1, 1, asrc_v1_m2m_rates);
> + v4l2_ctrl_new_int_menu(&pair_m2m->ctrl_handler, &asrc_m2m_ctrl_ops,
> + V4L2_CID_M2M_AUDIO_DEST_RATE,
> + ARRAY_SIZE(asrc_v1_m2m_rates) - 1, 1, asrc_v1_m2m_rates);
> + } else {
> + v4l2_ctrl_new_int_menu(&pair_m2m->ctrl_handler, &asrc_m2m_ctrl_ops,
> + V4L2_CID_M2M_AUDIO_SOURCE_RATE,
> + ARRAY_SIZE(asrc_v2_m2m_rates) - 1, 0, asrc_v2_m2m_rates);
> + v4l2_ctrl_new_int_menu(&pair_m2m->ctrl_handler, &asrc_m2m_ctrl_ops,
> + V4L2_CID_M2M_AUDIO_DEST_RATE,
> + ARRAY_SIZE(asrc_v2_m2m_rates) - 1, 0, asrc_v2_m2m_rates);
> + }
> +
> + v4l2_ctrl_new_custom(&pair_m2m->ctrl_handler, &asrc_src_rate_off_control, NULL);
> + v4l2_ctrl_new_custom(&pair_m2m->ctrl_handler, &asrc_dst_rate_off_control, NULL);
> +
> + if (pair_m2m->ctrl_handler.error) {
> + ret = pair_m2m->ctrl_handler.error;
> + v4l2_ctrl_handler_free(&pair_m2m->ctrl_handler);
> + goto err_ctrl_handler;
> + }
> +
> + pair_m2m->fh.ctrl_handler = &pair_m2m->ctrl_handler;
> +
> + mutex_unlock(&m2m->mlock);
> +
> + return 0;
> +
> +err_ctrl_handler:
> + v4l2_m2m_ctx_release(pair_m2m->fh.m2m_ctx);
> +err_ctx_init:
> + v4l2_fh_del(&pair_m2m->fh);
> + v4l2_fh_exit(&pair_m2m->fh);
> + kfree(pair_m2m);
> +err_alloc_pair_m2m:
> + kfree(pair);
> +err_alloc_pair:
> + mutex_unlock(&m2m->mlock);
> + return ret;
> +}
> +
> +static int asrc_m2m_release(struct file *file)
> +{
> + struct asrc_m2m *m2m = video_drvdata(file);
> + struct asrc_pair_m2m *pair_m2m = asrc_m2m_fh_to_ctx(file->private_data);
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> +
> + mutex_lock(&m2m->mlock);
> + v4l2_ctrl_handler_free(&pair_m2m->ctrl_handler);
> + v4l2_m2m_ctx_release(pair_m2m->fh.m2m_ctx);
> + v4l2_fh_del(&pair_m2m->fh);
> + v4l2_fh_exit(&pair_m2m->fh);
> + kfree(pair_m2m);
> + kfree(pair);
> + mutex_unlock(&m2m->mlock);
> +
> + return 0;
> +}
> +
> +static const struct v4l2_file_operations asrc_m2m_fops = {
> + .owner = THIS_MODULE,
> + .open = asrc_m2m_open,
> + .release = asrc_m2m_release,
> + .poll = v4l2_m2m_fop_poll,
> + .unlocked_ioctl = video_ioctl2,
> + .mmap = v4l2_m2m_fop_mmap,
> +};
> +
> +static int asrc_m2m_querycap(struct file *file, void *priv,
> + struct v4l2_capability *cap)
> +{
> + strscpy(cap->driver, M2M_DRV_NAME, sizeof(cap->driver));
> + strscpy(cap->card, M2M_DRV_NAME, sizeof(cap->card));
> + snprintf(cap->bus_info, sizeof(cap->bus_info),
> + "platform:%s", M2M_DRV_NAME);
No need to fill in bus_info, it should be done for you.
> + cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_AUDIO_M2M;
> +
> + return 0;
> +}
> +
> +static int enum_fmt(struct v4l2_fmtdesc *f, u64 fmtbit)
> +{
> + snd_pcm_format_t fmt;
> + int i, num;
> +
> + num = 0;
> +
> + for (i = 0; i < NUM_FORMATS; ++i) {
> + fmt = v4l2_fourcc_to_audfmt(formats[i]);
> + if (pcm_format_to_bits(fmt) & fmtbit) {
> + 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;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int asrc_m2m_enum_fmt_aud_cap(struct file *file, void *fh,
> + struct v4l2_fmtdesc *f)
> +{
> + struct asrc_pair_m2m *pair_m2m = asrc_m2m_fh_to_ctx(fh);
> + struct asrc_m2m *m2m = pair_m2m->m2m;
> +
> + return enum_fmt(f, m2m->pdata.fmt_out);
> +}
> +
> +static int asrc_m2m_enum_fmt_aud_out(struct file *file, void *fh,
> + struct v4l2_fmtdesc *f)
> +{
> + struct asrc_pair_m2m *pair_m2m = asrc_m2m_fh_to_ctx(fh);
> + struct asrc_m2m *m2m = pair_m2m->m2m;
> +
> + return enum_fmt(f, m2m->pdata.fmt_in);
> +}
> +
> +static int asrc_m2m_g_fmt_aud_cap(struct file *file, void *fh,
> + struct v4l2_format *f)
> +{
> + struct asrc_pair_m2m *pair_m2m = asrc_m2m_fh_to_ctx(fh);
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> +
> + f->fmt.audio.channels = pair->channels;
> + f->fmt.audio.buffersize = pair->buf_len[V4L_CAP];
> + f->fmt.audio.audioformat = find_fourcc(pair->sample_format[V4L_CAP]);
> +
> + return 0;
> +}
> +
> +static int asrc_m2m_g_fmt_aud_out(struct file *file, void *fh,
> + struct v4l2_format *f)
> +{
> + struct asrc_pair_m2m *pair_m2m = asrc_m2m_fh_to_ctx(fh);
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> +
> + f->fmt.audio.channels = pair->channels;
> + f->fmt.audio.buffersize = pair->buf_len[V4L_OUT];
> + f->fmt.audio.audioformat = find_fourcc(pair->sample_format[V4L_OUT]);
> +
> + return 0;
> +}
> +
> +/* output for asrc */
> +static int asrc_m2m_s_fmt_aud_cap(struct file *file, void *fh,
> + struct v4l2_format *f)
> +{
> + struct asrc_pair_m2m *pair_m2m = asrc_m2m_fh_to_ctx(fh);
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> + struct asrc_m2m *m2m = pair_m2m->m2m;
> + struct device *dev = &m2m->pdev->dev;
> +
> + f->fmt.audio.audioformat = asrc_check_format(pair_m2m, OUT, f->fmt.audio.audioformat);
> + f->fmt.audio.channels = asrc_check_channel(pair_m2m, OUT, f->fmt.audio.channels);
> +
> + if (pair_m2m->channels[V4L_CAP] > 0 &&
> + pair_m2m->channels[V4L_CAP] != f->fmt.audio.channels) {
> + dev_err(dev, "channels don't match for cap and out\n");
> + return -EINVAL;
> + }
> +
> + pair_m2m->channels[V4L_CAP] = f->fmt.audio.channels;
> + pair->channels = f->fmt.audio.channels;
> + pair->sample_format[V4L_CAP] = find_format(f->fmt.audio.audioformat);
> +
> + return 0;
> +}
> +
> +/* input for asrc */
> +static int asrc_m2m_s_fmt_aud_out(struct file *file, void *fh,
> + struct v4l2_format *f)
> +{
> + struct asrc_pair_m2m *pair_m2m = asrc_m2m_fh_to_ctx(fh);
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> + struct asrc_m2m *m2m = pair_m2m->m2m;
> + struct device *dev = &m2m->pdev->dev;
> +
> + f->fmt.audio.audioformat = asrc_check_format(pair_m2m, IN, f->fmt.audio.audioformat);
> + f->fmt.audio.channels = asrc_check_channel(pair_m2m, IN, f->fmt.audio.channels);
> + if (pair_m2m->channels[V4L_OUT] > 0 &&
> + pair_m2m->channels[V4L_OUT] != f->fmt.audio.channels) {
> + dev_err(dev, "channels don't match for cap and out\n");
> + return -EINVAL;
> + }
> +
> + pair_m2m->channels[V4L_OUT] = f->fmt.audio.channels;
> + pair->channels = f->fmt.audio.channels;
> + pair->sample_format[V4L_OUT] = find_format(f->fmt.audio.audioformat);
> +
> + return 0;
> +}
> +
> +static int asrc_m2m_try_fmt_audio_cap(struct file *file, void *fh,
> + struct v4l2_format *f)
> +{
> + struct asrc_pair_m2m *pair_m2m = asrc_m2m_fh_to_ctx(fh);
> +
> + f->fmt.audio.audioformat = asrc_check_format(pair_m2m, OUT, f->fmt.audio.audioformat);
> + f->fmt.audio.channels = asrc_check_channel(pair_m2m, OUT, f->fmt.audio.channels);
> +
> + return 0;
> +}
> +
> +static int asrc_m2m_try_fmt_audio_out(struct file *file, void *fh,
> + struct v4l2_format *f)
> +{
> + struct asrc_pair_m2m *pair_m2m = asrc_m2m_fh_to_ctx(fh);
> +
> + f->fmt.audio.audioformat = asrc_check_format(pair_m2m, IN, f->fmt.audio.audioformat);
> + f->fmt.audio.channels = asrc_check_channel(pair_m2m, IN, f->fmt.audio.channels);
> +
> + return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops asrc_m2m_ioctl_ops = {
> + .vidioc_querycap = asrc_m2m_querycap,
> +
> + .vidioc_enum_fmt_audio_cap = asrc_m2m_enum_fmt_aud_cap,
> + .vidioc_enum_fmt_audio_out = asrc_m2m_enum_fmt_aud_out,
> +
> + .vidioc_g_fmt_audio_cap = asrc_m2m_g_fmt_aud_cap,
> + .vidioc_g_fmt_audio_out = asrc_m2m_g_fmt_aud_out,
> +
> + .vidioc_s_fmt_audio_cap = asrc_m2m_s_fmt_aud_cap,
> + .vidioc_s_fmt_audio_out = asrc_m2m_s_fmt_aud_out,
> +
> + .vidioc_try_fmt_audio_cap = asrc_m2m_try_fmt_audio_cap,
> + .vidioc_try_fmt_audio_out = asrc_m2m_try_fmt_audio_out,
> +
> + .vidioc_qbuf = v4l2_m2m_ioctl_qbuf,
> + .vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf,
> +
> + .vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs,
> + .vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf,
> + .vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs,
> + .vidioc_querybuf = v4l2_m2m_ioctl_querybuf,
> + .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,
> +};
> +
> +/* dma complete callback */
> +static void asrc_input_dma_callback(void *data)
> +{
> + struct fsl_asrc_pair *pair = (struct fsl_asrc_pair *)data;
> +
> + complete(&pair->complete[V4L_OUT]);
> +}
> +
> +/* dma complete callback */
> +static void asrc_output_dma_callback(void *data)
> +{
> + struct fsl_asrc_pair *pair = (struct fsl_asrc_pair *)data;
> +
> + complete(&pair->complete[V4L_CAP]);
> +}
> +
> +/* config dma channel */
> +static int asrc_dmaconfig(struct asrc_pair_m2m *pair_m2m,
> + struct dma_chan *chan,
> + u32 dma_addr, dma_addr_t buf_addr, u32 buf_len,
> + int dir, int width)
> +{
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> + struct fsl_asrc *asrc = pair->asrc;
> + struct asrc_m2m *m2m = pair_m2m->m2m;
> + struct device *dev = &m2m->pdev->dev;
> + struct dma_slave_config slave_config;
> + enum dma_slave_buswidth buswidth;
> + unsigned int sg_len, max_period_size;
> + struct scatterlist *sg;
> + int ret, i;
> +
> + switch (width) {
> + case 8:
> + buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
> + break;
> + case 16:
> + buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
> + break;
> + case 24:
> + buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES;
> + break;
> + case 32:
> + buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
> + break;
> + default:
> + dev_err(dev, "invalid word width\n");
> + return -EINVAL;
> + }
> +
> + memset(&slave_config, 0, sizeof(slave_config));
> + if (dir == V4L_OUT) {
> + slave_config.direction = DMA_MEM_TO_DEV;
> + slave_config.dst_addr = dma_addr;
> + slave_config.dst_addr_width = buswidth;
> + slave_config.dst_maxburst = asrc->m2m_get_maxburst(IN, pair);
> + } else {
> + slave_config.direction = DMA_DEV_TO_MEM;
> + slave_config.src_addr = dma_addr;
> + slave_config.src_addr_width = buswidth;
> + slave_config.src_maxburst = asrc->m2m_get_maxburst(OUT, pair);
> + }
> +
> + ret = dmaengine_slave_config(chan, &slave_config);
> + if (ret) {
> + dev_err(dev, "failed to config dmaengine for %s task: %d\n",
> + DIR_STR(dir), ret);
> + return -EINVAL;
> + }
> +
> + max_period_size = rounddown(ASRC_M2M_PERIOD_SIZE, width * pair->channels / 8);
> + /* scatter gather mode */
> + sg_len = buf_len / max_period_size;
> + if (buf_len % max_period_size)
> + sg_len += 1;
> +
> + sg = kmalloc_array(sg_len, sizeof(*sg), GFP_KERNEL);
> + if (!sg)
> + return -ENOMEM;
> +
> + sg_init_table(sg, sg_len);
> + for (i = 0; i < (sg_len - 1); i++) {
> + sg_dma_address(&sg[i]) = buf_addr + i * max_period_size;
> + sg_dma_len(&sg[i]) = max_period_size;
> + }
> + sg_dma_address(&sg[i]) = buf_addr + i * max_period_size;
> + sg_dma_len(&sg[i]) = buf_len - i * max_period_size;
> +
> + pair->desc[dir] = dmaengine_prep_slave_sg(chan, sg, sg_len,
> + slave_config.direction,
> + DMA_PREP_INTERRUPT);
> + kfree(sg);
> + if (!pair->desc[dir]) {
> + dev_err(dev, "failed to prepare dmaengine for %s task\n", DIR_STR(dir));
> + return -EINVAL;
> + }
> +
> + pair->desc[dir]->callback = ASRC_xPUT_DMA_CALLBACK(dir);
> + pair->desc[dir]->callback_param = pair;
> +
> + return 0;
> +}
> +
> +static void asrc_m2m_set_ratio_mod(struct asrc_pair_m2m *pair_m2m)
> +{
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> + struct fsl_asrc *asrc = pair->asrc;
> + s32 src_rate_int, dst_rate_int;
> + s64 src_rate_frac;
> + s64 dst_rate_frac;
> + u64 src_rate, dst_rate;
> + u64 ratio_pre, ratio_cur;
> + s64 ratio_diff;
> +
> + if (!asrc->m2m_set_ratio_mod)
> + return;
> +
> + if (pair_m2m->src_rate_off_cur == pair_m2m->src_rate_off_prev &&
> + pair_m2m->dst_rate_off_cur == pair_m2m->dst_rate_off_prev)
> + return;
> +
> + /*
> + * use maximum rate 768kHz as limitation, then we can shift right 21 bit for
> + * division
> + */
> + src_rate_int = pair->rate[V4L_OUT];
> + src_rate_frac = pair_m2m->src_rate_off_prev;
> +
> + src_rate = ((s64)src_rate_int << 32) + src_rate_frac;
> +
> + dst_rate_int = pair->rate[V4L_CAP];
> + dst_rate_frac = pair_m2m->dst_rate_off_prev;
> +
> + dst_rate = ((s64)dst_rate_int << 32) + dst_rate_frac;
> + dst_rate >>= 21;
> + do_div(src_rate, dst_rate);
> + ratio_pre = src_rate;
> +
> + src_rate_frac = pair_m2m->src_rate_off_cur;
> + src_rate = ((s64)src_rate_int << 32) + src_rate_frac;
> +
> + dst_rate_frac = pair_m2m->dst_rate_off_cur;
> + dst_rate = ((s64)dst_rate_int << 32) + dst_rate_frac;
> + dst_rate >>= 21;
> + do_div(src_rate, dst_rate);
> + ratio_cur = src_rate;
> +
> + ratio_diff = ratio_cur - ratio_pre;
> + asrc->m2m_set_ratio_mod(pair, ratio_diff << 10);
> +
> + pair_m2m->src_rate_off_prev = pair_m2m->src_rate_off_cur;
> + pair_m2m->dst_rate_off_prev = pair_m2m->dst_rate_off_cur;
> +}
> +
> +/* main function of converter */
> +static void asrc_m2m_device_run(void *priv)
> +{
> + struct asrc_pair_m2m *pair_m2m = priv;
> + struct fsl_asrc_pair *pair = pair_m2m->pair;
> + struct asrc_m2m *m2m = pair_m2m->m2m;
> + struct fsl_asrc *asrc = pair->asrc;
> + struct device *dev = &m2m->pdev->dev;
> + enum asrc_pair_index index = pair->index;
> + struct vb2_v4l2_buffer *src_buf, *dst_buf;
> + unsigned int out_buf_len;
> + unsigned int cap_dma_len;
> + unsigned int width;
> + u32 fifo_addr;
> + int ret;
> +
> + /* set ratio mod */
> + asrc_m2m_set_ratio_mod(pair_m2m);
> +
> + src_buf = v4l2_m2m_next_src_buf(pair_m2m->fh.m2m_ctx);
> + dst_buf = v4l2_m2m_next_dst_buf(pair_m2m->fh.m2m_ctx);
> +
> + src_buf->sequence = pair_m2m->sequence[V4L_OUT]++;
> + dst_buf->sequence = pair_m2m->sequence[V4L_CAP]++;
> +
> + width = snd_pcm_format_physical_width(pair->sample_format[V4L_OUT]);
> + fifo_addr = asrc->paddr + asrc->get_fifo_addr(IN, index);
> + out_buf_len = vb2_get_plane_payload(&src_buf->vb2_buf, 0);
> + if (out_buf_len < width * pair->channels / 8 ||
> + out_buf_len > ASRC_M2M_BUFFER_SIZE ||
> + out_buf_len % (width * pair->channels / 8)) {
> + dev_err(dev, "out buffer size is error: [%d]\n", out_buf_len);
> + goto end;
> + }
> +
> + /* dma config for output dma channel */
> + ret = asrc_dmaconfig(pair_m2m,
> + pair->dma_chan[V4L_OUT],
> + fifo_addr,
> + vb2_dma_contig_plane_dma_addr(&src_buf->vb2_buf, 0),
> + out_buf_len, V4L_OUT, width);
> + if (ret) {
> + dev_err(dev, "out dma config error\n");
> + goto end;
> + }
> +
> + width = snd_pcm_format_physical_width(pair->sample_format[V4L_CAP]);
> + fifo_addr = asrc->paddr + asrc->get_fifo_addr(OUT, index);
> + cap_dma_len = asrc->m2m_calc_out_len(pair, out_buf_len);
> + if (cap_dma_len > 0 && cap_dma_len <= ASRC_M2M_BUFFER_SIZE) {
> + /* dma config for capture dma channel */
> + ret = asrc_dmaconfig(pair_m2m,
> + pair->dma_chan[V4L_CAP],
> + fifo_addr,
> + vb2_dma_contig_plane_dma_addr(&dst_buf->vb2_buf, 0),
> + cap_dma_len, V4L_CAP, width);
> + if (ret) {
> + dev_err(dev, "cap dma config error\n");
> + goto end;
> + }
> + } else if (cap_dma_len > ASRC_M2M_BUFFER_SIZE) {
> + dev_err(dev, "cap buffer size error\n");
> + goto end;
> + }
> +
> + reinit_completion(&pair->complete[V4L_OUT]);
> + reinit_completion(&pair->complete[V4L_CAP]);
> +
> + /* Submit DMA request */
> + dmaengine_submit(pair->desc[V4L_OUT]);
> + dma_async_issue_pending(pair->desc[V4L_OUT]->chan);
> + if (cap_dma_len > 0) {
> + dmaengine_submit(pair->desc[V4L_CAP]);
> + dma_async_issue_pending(pair->desc[V4L_CAP]->chan);
> + }
> +
> + asrc->m2m_start(pair);
> +
> + if (!wait_for_completion_interruptible_timeout(&pair->complete[V4L_OUT], 10 * HZ)) {
> + dev_err(dev, "out DMA task timeout\n");
> + goto end;
> + }
> +
> + if (cap_dma_len > 0) {
> + if (!wait_for_completion_interruptible_timeout(&pair->complete[V4L_CAP], 10 * HZ)) {
> + dev_err(dev, "cap DMA task timeout\n");
> + goto end;
> + }
> + }
> +
> + /* read the last words from FIFO */
> + asrc_read_last_fifo(pair, vb2_plane_vaddr(&dst_buf->vb2_buf, 0), &cap_dma_len);
> + /* update payload length for capture */
> + vb2_set_plane_payload(&dst_buf->vb2_buf, 0, cap_dma_len);
> +
> +end:
> + src_buf = v4l2_m2m_src_buf_remove(pair_m2m->fh.m2m_ctx);
> + dst_buf = v4l2_m2m_dst_buf_remove(pair_m2m->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(m2m->m2m_dev, pair_m2m->fh.m2m_ctx);
> +}
> +
> +static int asrc_m2m_job_ready(void *priv)
> +{
> + struct asrc_pair_m2m *pair_m2m = priv;
> +
> + if (v4l2_m2m_num_src_bufs_ready(pair_m2m->fh.m2m_ctx) > 0 &&
> + v4l2_m2m_num_dst_bufs_ready(pair_m2m->fh.m2m_ctx) > 0) {
> + return 1;
> + }
> +
> + return 0;
> +}
> +
> +static const struct v4l2_m2m_ops asrc_m2m_ops = {
> + .job_ready = asrc_m2m_job_ready,
> + .device_run = asrc_m2m_device_run,
> +};
> +
> +static const struct media_device_ops asrc_m2m_media_ops = {
> + .req_validate = vb2_request_validate,
> + .req_queue = v4l2_m2m_request_queue,
> +};
> +
> +static int asrc_m2m_probe(struct platform_device *pdev)
> +{
> + struct fsl_asrc_m2m_pdata *data = pdev->dev.platform_data;
> + struct device *dev = &pdev->dev;
> + struct asrc_m2m *m2m;
> + int ret;
> +
> + m2m = devm_kzalloc(dev, sizeof(*m2m), GFP_KERNEL);
> + if (!m2m)
> + return -ENOMEM;
> +
> + m2m->pdata = *data;
> + m2m->pdev = pdev;
> +
> + ret = v4l2_device_register(dev, &m2m->v4l2_dev);
> + if (ret) {
> + dev_err(dev, "failed to register v4l2 device\n");
> + goto err_register;
> + }
> +
> + m2m->m2m_dev = v4l2_m2m_init(&asrc_m2m_ops);
> + if (IS_ERR(m2m->m2m_dev)) {
> + ret = PTR_ERR(m2m->m2m_dev);
> + dev_err_probe(dev, ret, "failed to register v4l2 device\n");
> + goto err_m2m;
> + }
> +
> + m2m->dec_vdev = video_device_alloc();
> + if (!m2m->dec_vdev) {
> + ret = -ENOMEM;
> + goto err_vdev_alloc;
> + }
> +
> + mutex_init(&m2m->mlock);
> +
> + m2m->dec_vdev->fops = &asrc_m2m_fops;
> + m2m->dec_vdev->ioctl_ops = &asrc_m2m_ioctl_ops;
> + m2m->dec_vdev->minor = -1;
> + m2m->dec_vdev->release = video_device_release;
> + m2m->dec_vdev->lock = &m2m->mlock; /* lock for ioctl serialization */
> + m2m->dec_vdev->v4l2_dev = &m2m->v4l2_dev;
> + m2m->dec_vdev->vfl_dir = VFL_DIR_M2M;
> + m2m->dec_vdev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_AUDIO_M2M;
> +
> +#ifdef CONFIG_MEDIA_CONTROLLER
> + m2m->mdev.dev = &pdev->dev;
> + strscpy(m2m->mdev.model, M2M_DRV_NAME, sizeof(m2m->mdev.model));
> + snprintf(m2m->mdev.bus_info, sizeof(m2m->mdev.bus_info),
> + "platform:%s", M2M_DRV_NAME);
> + media_device_init(&m2m->mdev);
> + m2m->mdev.ops = &asrc_m2m_media_ops;
> + m2m->v4l2_dev.mdev = &m2m->mdev;
> +#endif
> +
> + ret = video_register_device(m2m->dec_vdev, VFL_TYPE_AUDIO, -1);
> + if (ret) {
> + dev_err_probe(dev, ret, "failed to register video device\n");
> + goto err_vdev_register;
> + }
> +
> +#ifdef CONFIG_MEDIA_CONTROLLER
> + ret = v4l2_m2m_register_media_controller(m2m->m2m_dev, m2m->dec_vdev,
> + MEDIA_ENT_F_PROC_AUDIO_RESAMPLER);
> + if (ret) {
> + dev_err_probe(dev, ret, "Failed to init mem2mem media controller\n");
> + goto error_v4l2;
> + }
> +
> + ret = media_device_register(&m2m->mdev);
> + if (ret) {
> + dev_err_probe(dev, ret, "Failed to register mem2mem media device\n");
> + goto error_m2m_mc;
> + }
> +#endif
> +
> + video_set_drvdata(m2m->dec_vdev, m2m);
> + platform_set_drvdata(pdev, m2m);
> + pm_runtime_enable(&pdev->dev);
> +
> + return 0;
> +
> +#ifdef CONFIG_MEDIA_CONTROLLER
> +error_m2m_mc:
> + v4l2_m2m_unregister_media_controller(m2m->m2m_dev);
> +#endif
> +error_v4l2:
> + video_unregister_device(m2m->dec_vdev);
> +err_vdev_register:
> + video_device_release(m2m->dec_vdev);
> +err_vdev_alloc:
> + v4l2_m2m_release(m2m->m2m_dev);
> +err_m2m:
> + v4l2_device_unregister(&m2m->v4l2_dev);
> +err_register:
> + return ret;
> +}
> +
> +static void asrc_m2m_remove(struct platform_device *pdev)
> +{
> + struct asrc_m2m *m2m = platform_get_drvdata(pdev);
> +
> + pm_runtime_disable(&pdev->dev);
> +#ifdef CONFIG_MEDIA_CONTROLLER
> + media_device_unregister(&m2m->mdev);
> + v4l2_m2m_unregister_media_controller(m2m->m2m_dev);
> +#endif
> + video_unregister_device(m2m->dec_vdev);
> + video_device_release(m2m->dec_vdev);
> + v4l2_m2m_release(m2m->m2m_dev);
> + v4l2_device_unregister(&m2m->v4l2_dev);
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +/* suspend callback for m2m */
> +static int asrc_m2m_suspend(struct device *dev)
> +{
> + struct asrc_m2m *m2m = dev_get_drvdata(dev);
> + struct fsl_asrc *asrc = m2m->pdata.asrc;
> + struct fsl_asrc_pair *pair;
> + unsigned long lock_flags;
> + int i;
> +
> + for (i = 0; i < PAIR_CTX_NUM; i++) {
> + spin_lock_irqsave(&asrc->lock, lock_flags);
> + pair = asrc->pair[i];
> + if (!pair || !pair->req_pair) {
> + spin_unlock_irqrestore(&asrc->lock, lock_flags);
> + continue;
> + }
> + if (!completion_done(&pair->complete[V4L_OUT])) {
> + if (pair->dma_chan[V4L_OUT])
> + dmaengine_terminate_all(pair->dma_chan[V4L_OUT]);
> + asrc_input_dma_callback((void *)pair);
> + }
> + if (!completion_done(&pair->complete[V4L_CAP])) {
> + if (pair->dma_chan[V4L_CAP])
> + dmaengine_terminate_all(pair->dma_chan[V4L_CAP]);
> + asrc_output_dma_callback((void *)pair);
> + }
> +
> + if (asrc->m2m_pair_suspend)
> + asrc->m2m_pair_suspend(pair);
> +
> + spin_unlock_irqrestore(&asrc->lock, lock_flags);
> + }
> +
> + return 0;
> +}
> +
> +static int asrc_m2m_resume(struct device *dev)
> +{
> + struct asrc_m2m *m2m = dev_get_drvdata(dev);
> + struct fsl_asrc *asrc = m2m->pdata.asrc;
> + struct fsl_asrc_pair *pair;
> + unsigned long lock_flags;
> + int i;
> +
> + for (i = 0; i < PAIR_CTX_NUM; i++) {
> + spin_lock_irqsave(&asrc->lock, lock_flags);
> + pair = asrc->pair[i];
> + if (!pair || !pair->req_pair) {
> + spin_unlock_irqrestore(&asrc->lock, lock_flags);
> + continue;
> + }
> + if (asrc->m2m_pair_resume)
> + asrc->m2m_pair_resume(pair);
> +
> + spin_unlock_irqrestore(&asrc->lock, lock_flags);
> + }
> +
> + return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops asrc_m2m_pm_ops = {
> + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(asrc_m2m_suspend,
> + asrc_m2m_resume)
> +};
> +
> +static const struct platform_device_id asrc_m2m_driver_ids[] __always_unused = {
> + { .name = M2M_DRV_NAME },
> + { },
> +};
> +MODULE_DEVICE_TABLE(platform, asrc_m2m_driver_ids);
> +
> +static struct platform_driver asrc_m2m_driver = {
> + .probe = asrc_m2m_probe,
> + .remove_new = asrc_m2m_remove,
> + .id_table = asrc_m2m_driver_ids,
> + .driver = {
> + .name = M2M_DRV_NAME,
> + .pm = &asrc_m2m_pm_ops,
> + },
> +};
> +module_platform_driver(asrc_m2m_driver);
> +
> +MODULE_DESCRIPTION("Freescale ASRC M2M driver");
> +MODULE_LICENSE("GPL");
Regards,
Hans