From patchwork Fri Oct 27 10:35:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shengjiu Wang X-Patchwork-Id: 13438547 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1FA05C25B47 for ; Fri, 27 Oct 2023 11:18:32 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 47CB5E10; Fri, 27 Oct 2023 13:17:40 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 47CB5E10 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1698405510; bh=iACBf1h+5dTabt14Jak1oYso8jb/q+P519uVR4T5REs=; h=From:To:Subject:Date:In-Reply-To:References:List-Id:List-Archive: List-Help:List-Owner:List-Post:List-Subscribe:List-Unsubscribe: From; b=rmDojgLJ0/tvkodX2VrH//2byKHqVcJEANsdzlPgnfpP2HzWIEO9zp1g62CUS5rLH DXf4KP0V4wbe6KPhb8fJooQeRRmzwkQk38/L+3WexjvuAbEVS77GvUybk0xBgyZVnj vBZiwiD3XAr8deVkBKCA8uHpQePKqW3EZxK4fbaU= Received: by alsa1.perex.cz (Postfix, from userid 50401) id 63972F8028D; Fri, 27 Oct 2023 13:15:26 +0200 (CEST) Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id 688DEF805EA; Fri, 27 Oct 2023 13:15:25 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id CA51DF805EA; Fri, 27 Oct 2023 13:15:21 +0200 (CEST) Received: from inva020.nxp.com (inva020.nxp.com [92.121.34.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 57921F805AC for ; Fri, 27 Oct 2023 13:14:52 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 57921F805AC Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id E6B091A0791; Fri, 27 Oct 2023 13:14:51 +0200 (CEST) Received: from aprdc01srsp001v.ap-rdc01.nxp.com (aprdc01srsp001v.ap-rdc01.nxp.com [165.114.16.16]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 5C07A1A1EA1; Fri, 27 Oct 2023 13:14:51 +0200 (CEST) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by aprdc01srsp001v.ap-rdc01.nxp.com (Postfix) with ESMTP id 2E21C180031E; Fri, 27 Oct 2023 19:14:49 +0800 (+08) From: Shengjiu Wang To: hverkuil@xs4all.nl, sakari.ailus@iki.fi, tfiga@chromium.org, m.szyprowski@samsung.com, mchehab@kernel.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, shengjiu.wang@gmail.com, Xiubo.Lee@gmail.com, festevam@gmail.com, nicoleotsuka@gmail.com, lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz, tiwai@suse.com, alsa-devel@alsa-project.org, linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH v8 13/13] media: vim2m_audio: add virtual driver for audio memory to memory Date: Fri, 27 Oct 2023 18:35:48 +0800 Message-Id: <1698402948-10618-14-git-send-email-shengjiu.wang@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1698402948-10618-1-git-send-email-shengjiu.wang@nxp.com> References: <1698402948-10618-1-git-send-email-shengjiu.wang@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Message-ID-Hash: 2EWV4GMCPKXCZU3ABB3XYKPP27KU4YJ2 X-Message-ID-Hash: 2EWV4GMCPKXCZU3ABB3XYKPP27KU4YJ2 X-MailFrom: shengjiu.wang@nxp.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Patchwork-State: RFC 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 Signed-off-by: Hans Verkuil --- drivers/media/test-drivers/Kconfig | 9 + drivers/media/test-drivers/Makefile | 1 + drivers/media/test-drivers/vim2m_audio.c | 680 +++++++++++++++++++++++ 3 files changed, 690 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 459b433e9fae..c280e192d43a 100644 --- a/drivers/media/test-drivers/Kconfig +++ b/drivers/media/test-drivers/Kconfig @@ -17,6 +17,15 @@ 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 + 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..c2c33282bf96 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..2134e8338417 --- /dev/null +++ b/drivers/media/test-drivers/vim2m_audio.c @@ -0,0 +1,680 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * A virtual v4l2-mem2mem example for audio device. + */ + +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +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_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, +}; + +#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; + 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; +}; + +struct audm2m_ctx { + struct v4l2_fh fh; + 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; + + 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); + + /* Process the conversion */ + src_size = vb2_get_plane_payload(&src_buf->vb2_buf, 0); + + if (src_size > q_data_dst->buffersize) + dst_size = q_data_dst->buffersize; + else + dst_size = src_size; + + memcpy(vb2_plane_vaddr(&dst_buf->vb2_buf, 0), + vb2_plane_vaddr(&src_buf->vb2_buf, 0), + dst_size); + + 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)); + snprintf(cap->bus_info, sizeof(cap->bus_info), + "platform:%s", MEM2MEM_NAME); + + 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) +{ + if (f->fmt.audio.channels < 1) + f->fmt.audio.channels = 1; + else if (f->fmt.audio.channels > 8) + f->fmt.audio.channels = 8; + + 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 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, + .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; + src_vq->min_buffers_needed = 1; + + 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; + dst_vq->min_buffers_needed = 1; + + return vb2_queue_init(dst_vq); +} + +/* + * 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 = 2; + + /* 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 * 2 * 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); + +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_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); + + 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 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; + } + + 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; + } + + v4l2_info(&dev->v4l2_dev, + "Device registered as /dev/v4l-audio%d\n", vfd->num); + + return 0; + +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); + + 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);