// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
//
// This file is provided under a dual BSD/GPLv2 license.  When using or
// redistributing this file, you may do so under either license.
//
// Copyright(c) 2018 Intel Corporation. All rights reserved.
//
// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
//
// PCM Layer, interface between ALSA and IPC.
//

#include <linux/pm_runtime.h>
#include <sound/pcm_params.h>
#include <sound/sof.h>
#include "sof-priv.h"
#include "sof-audio.h"
#include "ops.h"
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_PROBES)
#include "sof-probes.h"
#endif

/* Create DMA buffer page table for DSP */
static int create_page_table(struct snd_soc_component *component,
                             struct snd_pcm_substream *substream,
                             unsigned char *dma_area, size_t size)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_sof_pcm *spcm;
        struct snd_dma_buffer *dmab = snd_pcm_get_dma_buf(substream);
        int stream = substream->stream;

        spcm = snd_sof_find_spcm_dai(component, rtd);
        if (!spcm)
                return -EINVAL;

        return snd_sof_create_page_table(component->dev, dmab,
                spcm->stream[stream].page_table.area, size);
}

static int sof_pcm_dsp_params(struct snd_sof_pcm *spcm, struct snd_pcm_substream *substream,
                              const struct sof_ipc_pcm_params_reply *reply)
{
        struct snd_soc_component *scomp = spcm->scomp;
        struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(scomp);

        /* validate offset */
        int ret = snd_sof_ipc_pcm_params(sdev, substream, reply);

        if (ret < 0)
                dev_err(scomp->dev, "error: got wrong reply for PCM %d\n",
                        spcm->pcm.pcm_id);

        return ret;
}

/*
 * sof pcm period elapse work
 */
static void snd_sof_pcm_period_elapsed_work(struct work_struct *work)
{
        struct snd_sof_pcm_stream *sps =
                container_of(work, struct snd_sof_pcm_stream,
                             period_elapsed_work);

        snd_pcm_period_elapsed(sps->substream);
}

void snd_sof_pcm_init_elapsed_work(struct work_struct *work)
{
         INIT_WORK(work, snd_sof_pcm_period_elapsed_work);
}

/*
 * sof pcm period elapse, this could be called at irq thread context.
 */
void snd_sof_pcm_period_elapsed(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component =
                snd_soc_rtdcom_lookup(rtd, SOF_AUDIO_PCM_DRV_NAME);
        struct snd_sof_pcm *spcm;

        spcm = snd_sof_find_spcm_dai(component, rtd);
        if (!spcm) {
                dev_err(component->dev,
                        "error: period elapsed for unknown stream!\n");
                return;
        }

        /*
         * snd_pcm_period_elapsed() can be called in interrupt context
         * before IRQ_HANDLED is returned. Inside snd_pcm_period_elapsed(),
         * when the PCM is done draining or xrun happened, a STOP IPC will
         * then be sent and this IPC will hit IPC timeout.
         * To avoid sending IPC before the previous IPC is handled, we
         * schedule delayed work here to call the snd_pcm_period_elapsed().
         */
        schedule_work(&spcm->stream[substream->stream].period_elapsed_work);
}
EXPORT_SYMBOL(snd_sof_pcm_period_elapsed);

static int sof_pcm_dsp_pcm_free(struct snd_pcm_substream *substream,
                                struct snd_sof_dev *sdev,
                                struct snd_sof_pcm *spcm)
{
        struct sof_ipc_stream stream;
        struct sof_ipc_reply reply;
        int ret;

        stream.hdr.size = sizeof(stream);
        stream.hdr.cmd = SOF_IPC_GLB_STREAM_MSG | SOF_IPC_STREAM_PCM_FREE;
        stream.comp_id = spcm->stream[substream->stream].comp_id;

        /* send IPC to the DSP */
        ret = sof_ipc_tx_message(sdev->ipc, stream.hdr.cmd, &stream,
                                 sizeof(stream), &reply, sizeof(reply));
        if (!ret)
                spcm->prepared[substream->stream] = false;

        return ret;
}

static int sof_pcm_setup_connected_widgets(struct snd_sof_dev *sdev,
                                           struct snd_soc_pcm_runtime *rtd,
                                           struct snd_sof_pcm *spcm, int dir)
{
        struct snd_soc_dai *dai;
        int ret, j;

        /* query DAPM for list of connected widgets and set them up */
        for_each_rtd_cpu_dais(rtd, j, dai) {
                struct snd_soc_dapm_widget_list *list;

                ret = snd_soc_dapm_dai_get_connected_widgets(dai, dir, &list,
                                                             dpcm_end_walk_at_be);
                if (ret < 0) {
                        dev_err(sdev->dev, "error: dai %s has no valid %s path\n", dai->name,
                                dir == SNDRV_PCM_STREAM_PLAYBACK ? "playback" : "capture");
                        return ret;
                }

                spcm->stream[dir].list = list;

                ret = sof_widget_list_setup(sdev, spcm, dir);
                if (ret < 0) {
                        dev_err(sdev->dev, "error: failed widget list set up for pcm %d dir %d\n",
                                spcm->pcm.pcm_id, dir);
                        spcm->stream[dir].list = NULL;
                        snd_soc_dapm_dai_free_widgets(&list);
                        return ret;
                }
        }

        return 0;
}

static int sof_pcm_hw_params(struct snd_soc_component *component,
                             struct snd_pcm_substream *substream,
                             struct snd_pcm_hw_params *params)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
        struct snd_sof_pcm *spcm;
        struct sof_ipc_pcm_params pcm;
        struct sof_ipc_pcm_params_reply ipc_params_reply;
        int ret;

        /* nothing to do for BE */
        if (rtd->dai_link->no_pcm)
                return 0;

        spcm = snd_sof_find_spcm_dai(component, rtd);
        if (!spcm)
                return -EINVAL;

        /*
         * Handle repeated calls to hw_params() without free_pcm() in
         * between. At least ALSA OSS emulation depends on this.
         */
        if (spcm->prepared[substream->stream]) {
                ret = sof_pcm_dsp_pcm_free(substream, sdev, spcm);
                if (ret < 0)
                        return ret;
        }

        dev_dbg(component->dev, "pcm: hw params stream %d dir %d\n",
                spcm->pcm.pcm_id, substream->stream);

        memset(&pcm, 0, sizeof(pcm));

        /* create compressed page table for audio firmware */
        if (runtime->buffer_changed) {
                ret = create_page_table(component, substream, runtime->dma_area,
                                        runtime->dma_bytes);
                if (ret < 0)
                        return ret;
        }

        /* number of pages should be rounded up */
        pcm.params.buffer.pages = PFN_UP(runtime->dma_bytes);

        /* set IPC PCM parameters */
        pcm.hdr.size = sizeof(pcm);
        pcm.hdr.cmd = SOF_IPC_GLB_STREAM_MSG | SOF_IPC_STREAM_PCM_PARAMS;
        pcm.comp_id = spcm->stream[substream->stream].comp_id;
        pcm.params.hdr.size = sizeof(pcm.params);
        pcm.params.buffer.phy_addr =
                spcm->stream[substream->stream].page_table.addr;
        pcm.params.buffer.size = runtime->dma_bytes;
        pcm.params.direction = substream->stream;
        pcm.params.sample_valid_bytes = params_width(params) >> 3;
        pcm.params.buffer_fmt = SOF_IPC_BUFFER_INTERLEAVED;
        pcm.params.rate = params_rate(params);
        pcm.params.channels = params_channels(params);
        pcm.params.host_period_bytes = params_period_bytes(params);

        /* container size */
        ret = snd_pcm_format_physical_width(params_format(params));
        if (ret < 0)
                return ret;
        pcm.params.sample_container_bytes = ret >> 3;

        /* format */
        switch (params_format(params)) {
        case SNDRV_PCM_FORMAT_S16:
                pcm.params.frame_fmt = SOF_IPC_FRAME_S16_LE;
                break;
        case SNDRV_PCM_FORMAT_S24:
                pcm.params.frame_fmt = SOF_IPC_FRAME_S24_4LE;
                break;
        case SNDRV_PCM_FORMAT_S32:
                pcm.params.frame_fmt = SOF_IPC_FRAME_S32_LE;
                break;
        case SNDRV_PCM_FORMAT_FLOAT:
                pcm.params.frame_fmt = SOF_IPC_FRAME_FLOAT;
                break;
        default:
                return -EINVAL;
        }

        /* firmware already configured host stream */
        ret = snd_sof_pcm_platform_hw_params(sdev,
                                             substream,
                                             params,
                                             &pcm.params);
        if (ret < 0) {
                dev_err(component->dev, "error: platform hw params failed\n");
                return ret;
        }

        dev_dbg(component->dev, "stream_tag %d", pcm.params.stream_tag);

        /* if this is a repeated hw_params without hw_free, skip setting up widgets */
        if (!spcm->stream[substream->stream].list) {
                ret = sof_pcm_setup_connected_widgets(sdev, rtd, spcm, substream->stream);
                if (ret < 0)
                        return ret;
        }

        /* send hw_params IPC to the DSP */
        ret = sof_ipc_tx_message(sdev->ipc, pcm.hdr.cmd, &pcm, sizeof(pcm),
                                 &ipc_params_reply, sizeof(ipc_params_reply));
        if (ret < 0) {
                dev_err(component->dev, "error: hw params ipc failed for stream %d\n",
                        pcm.params.stream_tag);
                return ret;
        }

        ret = sof_pcm_dsp_params(spcm, substream, &ipc_params_reply);
        if (ret < 0)
                return ret;

        spcm->prepared[substream->stream] = true;

        /* save pcm hw_params */
        memcpy(&spcm->params[substream->stream], params, sizeof(*params));

        return ret;
}

static int sof_pcm_hw_free(struct snd_soc_component *component,
                           struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
        struct snd_sof_pcm *spcm;
        int ret, err = 0;

        /* nothing to do for BE */
        if (rtd->dai_link->no_pcm)
                return 0;

        spcm = snd_sof_find_spcm_dai(component, rtd);
        if (!spcm)
                return -EINVAL;

        dev_dbg(component->dev, "pcm: free stream %d dir %d\n",
                spcm->pcm.pcm_id, substream->stream);

        if (spcm->prepared[substream->stream]) {
                ret = sof_pcm_dsp_pcm_free(substream, sdev, spcm);
                if (ret < 0)
                        err = ret;
        }

        ret = sof_widget_list_free(sdev, spcm, substream->stream);
        if (ret < 0)
                err = ret;

        cancel_work_sync(&spcm->stream[substream->stream].period_elapsed_work);

        ret = snd_sof_pcm_platform_hw_free(sdev, substream);
        if (ret < 0) {
                dev_err(component->dev, "error: platform hw free failed\n");
                err = ret;
        }

        return err;
}

static int sof_pcm_prepare(struct snd_soc_component *component,
                           struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_sof_pcm *spcm;
        int ret;

        /* nothing to do for BE */
        if (rtd->dai_link->no_pcm)
                return 0;

        spcm = snd_sof_find_spcm_dai(component, rtd);
        if (!spcm)
                return -EINVAL;

        if (spcm->prepared[substream->stream])
                return 0;

        dev_dbg(component->dev, "pcm: prepare stream %d dir %d\n",
                spcm->pcm.pcm_id, substream->stream);

        /* set hw_params */
        ret = sof_pcm_hw_params(component,
                                substream, &spcm->params[substream->stream]);
        if (ret < 0) {
                dev_err(component->dev,
                        "error: set pcm hw_params after resume\n");
                return ret;
        }

        return 0;
}

/*
 * FE dai link trigger actions are always executed in non-atomic context because
 * they involve IPC's.
 */
static int sof_pcm_trigger(struct snd_soc_component *component,
                           struct snd_pcm_substream *substream, int cmd)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
        struct snd_sof_pcm *spcm;
        struct sof_ipc_stream stream;
        struct sof_ipc_reply reply;
        bool reset_hw_params = false;
        bool free_widget_list = false;
        bool ipc_first = false;
        int ret;

        /* nothing to do for BE */
        if (rtd->dai_link->no_pcm)
                return 0;

        spcm = snd_sof_find_spcm_dai(component, rtd);
        if (!spcm)
                return -EINVAL;

        dev_dbg(component->dev, "pcm: trigger stream %d dir %d cmd %d\n",
                spcm->pcm.pcm_id, substream->stream, cmd);

        stream.hdr.size = sizeof(stream);
        stream.hdr.cmd = SOF_IPC_GLB_STREAM_MSG;
        stream.comp_id = spcm->stream[substream->stream].comp_id;

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_PAUSE;
                ipc_first = true;
                break;
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_RELEASE;
                break;
        case SNDRV_PCM_TRIGGER_RESUME:
                if (spcm->stream[substream->stream].suspend_ignored) {
                        /*
                         * this case will be triggered when INFO_RESUME is
                         * supported, no need to resume streams that remained
                         * enabled in D0ix.
                         */
                        spcm->stream[substream->stream].suspend_ignored = false;
                        return 0;
                }

                /* set up hw_params */
                ret = sof_pcm_prepare(component, substream);
                if (ret < 0) {
                        dev_err(component->dev,
                                "error: failed to set up hw_params upon resume\n");
                        return ret;
                }

                fallthrough;
        case SNDRV_PCM_TRIGGER_START:
                if (spcm->stream[substream->stream].suspend_ignored) {
                        /*
                         * This case will be triggered when INFO_RESUME is
                         * not supported, no need to re-start streams that
                         * remained enabled in D0ix.
                         */
                        spcm->stream[substream->stream].suspend_ignored = false;
                        return 0;
                }
                stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_START;
                break;
        case SNDRV_PCM_TRIGGER_SUSPEND:
                if (sdev->system_suspend_target == SOF_SUSPEND_S0IX &&
                    spcm->stream[substream->stream].d0i3_compatible) {
                        /*
                         * trap the event, not sending trigger stop to
                         * prevent the FW pipelines from being stopped,
                         * and mark the flag to ignore the upcoming DAPM
                         * PM events.
                         */
                        spcm->stream[substream->stream].suspend_ignored = true;
                        return 0;
                }
                free_widget_list = true;
                fallthrough;
        case SNDRV_PCM_TRIGGER_STOP:
                stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_STOP;
                ipc_first = true;
                reset_hw_params = true;
                break;
        default:
                dev_err(component->dev, "error: unhandled trigger cmd %d\n",
                        cmd);
                return -EINVAL;
        }

        /*
         * DMA and IPC sequence is different for start and stop. Need to send
         * STOP IPC before stop DMA
         */
        if (!ipc_first)
                snd_sof_pcm_platform_trigger(sdev, substream, cmd);

        /* send IPC to the DSP */
        ret = sof_ipc_tx_message(sdev->ipc, stream.hdr.cmd, &stream,
                                 sizeof(stream), &reply, sizeof(reply));

        /* need to STOP DMA even if STOP IPC failed */
        if (ipc_first)
                snd_sof_pcm_platform_trigger(sdev, substream, cmd);

        /* free PCM if reset_hw_params is set and the STOP IPC is successful */
        if (!ret && reset_hw_params) {
                ret = sof_pcm_dsp_pcm_free(substream, sdev, spcm);
                if (ret < 0)
                        return ret;

                /* free widget list only for SUSPEND trigger */
                if (free_widget_list)
                        ret = sof_widget_list_free(sdev, spcm, substream->stream);
        }

        return ret;
}

static snd_pcm_uframes_t sof_pcm_pointer(struct snd_soc_component *component,
                                         struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
        struct snd_sof_pcm *spcm;
        snd_pcm_uframes_t host, dai;

        /* nothing to do for BE */
        if (rtd->dai_link->no_pcm)
                return 0;

        /* use dsp ops pointer callback directly if set */
        if (sof_ops(sdev)->pcm_pointer)
                return sof_ops(sdev)->pcm_pointer(sdev, substream);

        spcm = snd_sof_find_spcm_dai(component, rtd);
        if (!spcm)
                return -EINVAL;

        /* read position from DSP */
        host = bytes_to_frames(substream->runtime,
                               spcm->stream[substream->stream].posn.host_posn);
        dai = bytes_to_frames(substream->runtime,
                              spcm->stream[substream->stream].posn.dai_posn);

        dev_vdbg(component->dev,
                 "PCM: stream %d dir %d DMA position %lu DAI position %lu\n",
                 spcm->pcm.pcm_id, substream->stream, host, dai);

        return host;
}

static int sof_pcm_open(struct snd_soc_component *component,
                        struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
        const struct snd_sof_dsp_ops *ops = sof_ops(sdev);
        struct snd_sof_pcm *spcm;
        struct snd_soc_tplg_stream_caps *caps;
        int ret;

        /* nothing to do for BE */
        if (rtd->dai_link->no_pcm)
                return 0;

        spcm = snd_sof_find_spcm_dai(component, rtd);
        if (!spcm)
                return -EINVAL;

        dev_dbg(component->dev, "pcm: open stream %d dir %d\n",
                spcm->pcm.pcm_id, substream->stream);


        caps = &spcm->pcm.caps[substream->stream];

        /* set runtime config */
        runtime->hw.info = ops->hw_info; /* platform-specific */

        /* set any runtime constraints based on topology */
        runtime->hw.formats = le64_to_cpu(caps->formats);
        runtime->hw.period_bytes_min = le32_to_cpu(caps->period_size_min);
        runtime->hw.period_bytes_max = le32_to_cpu(caps->period_size_max);
        runtime->hw.periods_min = le32_to_cpu(caps->periods_min);
        runtime->hw.periods_max = le32_to_cpu(caps->periods_max);

        /*
         * caps->buffer_size_min is not used since the
         * snd_pcm_hardware structure only defines buffer_bytes_max
         */
        runtime->hw.buffer_bytes_max = le32_to_cpu(caps->buffer_size_max);

        dev_dbg(component->dev, "period min %zd max %zd bytes\n",
                runtime->hw.period_bytes_min,
                runtime->hw.period_bytes_max);
        dev_dbg(component->dev, "period count %d max %d\n",
                runtime->hw.periods_min,
                runtime->hw.periods_max);
        dev_dbg(component->dev, "buffer max %zd bytes\n",
                runtime->hw.buffer_bytes_max);

        /* set wait time - TODO: come from topology */
        substream->wait_time = 500;

        spcm->stream[substream->stream].posn.host_posn = 0;
        spcm->stream[substream->stream].posn.dai_posn = 0;
        spcm->stream[substream->stream].substream = substream;
        spcm->prepared[substream->stream] = false;

        ret = snd_sof_pcm_platform_open(sdev, substream);
        if (ret < 0)
                dev_err(component->dev, "error: pcm open failed %d\n", ret);

        return ret;
}

static int sof_pcm_close(struct snd_soc_component *component,
                         struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
        struct snd_sof_pcm *spcm;
        int err;

        /* nothing to do for BE */
        if (rtd->dai_link->no_pcm)
                return 0;

        spcm = snd_sof_find_spcm_dai(component, rtd);
        if (!spcm)
                return -EINVAL;

        dev_dbg(component->dev, "pcm: close stream %d dir %d\n",
                spcm->pcm.pcm_id, substream->stream);

        err = snd_sof_pcm_platform_close(sdev, substream);
        if (err < 0) {
                dev_err(component->dev, "error: pcm close failed %d\n",
                        err);
                /*
                 * keep going, no point in preventing the close
                 * from happening
                 */
        }

        return 0;
}

/*
 * Pre-allocate playback/capture audio buffer pages.
 * no need to explicitly release memory preallocated by sof_pcm_new in pcm_free
 * snd_pcm_lib_preallocate_free_for_all() is called by the core.
 */
static int sof_pcm_new(struct snd_soc_component *component,
                       struct snd_soc_pcm_runtime *rtd)
{
        struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
        struct snd_sof_pcm *spcm;
        struct snd_pcm *pcm = rtd->pcm;
        struct snd_soc_tplg_stream_caps *caps;
        int stream = SNDRV_PCM_STREAM_PLAYBACK;

        /* find SOF PCM for this RTD */
        spcm = snd_sof_find_spcm_dai(component, rtd);
        if (!spcm) {
                dev_warn(component->dev, "warn: can't find PCM with DAI ID %d\n",
                         rtd->dai_link->id);
                return 0;
        }

        dev_dbg(component->dev, "creating new PCM %s\n", spcm->pcm.pcm_name);

        /* do we need to pre-allocate playback audio buffer pages */
        if (!spcm->pcm.playback)
                goto capture;

        caps = &spcm->pcm.caps[stream];

        /* pre-allocate playback audio buffer pages */
        dev_dbg(component->dev,
                "spcm: allocate %s playback DMA buffer size 0x%x max 0x%x\n",
                caps->name, caps->buffer_size_min, caps->buffer_size_max);

        if (!pcm->streams[stream].substream) {
                dev_err(component->dev, "error: NULL playback substream!\n");
                return -EINVAL;
        }

        snd_pcm_set_managed_buffer(pcm->streams[stream].substream,
                                   SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
                                   0, le32_to_cpu(caps->buffer_size_max));
capture:
        stream = SNDRV_PCM_STREAM_CAPTURE;

        /* do we need to pre-allocate capture audio buffer pages */
        if (!spcm->pcm.capture)
                return 0;

        caps = &spcm->pcm.caps[stream];

        /* pre-allocate capture audio buffer pages */
        dev_dbg(component->dev,
                "spcm: allocate %s capture DMA buffer size 0x%x max 0x%x\n",
                caps->name, caps->buffer_size_min, caps->buffer_size_max);

        if (!pcm->streams[stream].substream) {
                dev_err(component->dev, "error: NULL capture substream!\n");
                return -EINVAL;
        }

        snd_pcm_set_managed_buffer(pcm->streams[stream].substream,
                                   SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
                                   0, le32_to_cpu(caps->buffer_size_max));

        return 0;
}

static void ssp_dai_config_pcm_params_match(struct snd_sof_dev *sdev, const char *link_name,
                                            struct snd_pcm_hw_params *params)
{
        struct sof_ipc_dai_config *config;
        struct snd_sof_dai *dai;
        int i;

        /*
         * Search for all matching DAIs as we can have both playback and capture DAI
         * associated with the same link.
         */
        list_for_each_entry(dai, &sdev->dai_list, list) {
                if (!dai->name || strcmp(link_name, dai->name))
                        continue;
                for (i = 0; i < dai->number_configs; i++) {
                        config = &dai->dai_config[i];
                        if (config->ssp.fsync_rate == params_rate(params)) {
                                dev_dbg(sdev->dev, "DAI config %d matches pcm hw params\n", i);
                                dai->current_config = i;
                                break;
                        }
                }
        }
}

/* fixup the BE DAI link to match any values from topology */
int sof_pcm_dai_link_fixup(struct snd_soc_pcm_runtime *rtd, struct snd_pcm_hw_params *params)
{
        struct snd_interval *rate = hw_param_interval(params,
                        SNDRV_PCM_HW_PARAM_RATE);
        struct snd_interval *channels = hw_param_interval(params,
                                                SNDRV_PCM_HW_PARAM_CHANNELS);
        struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
        struct snd_soc_component *component =
                snd_soc_rtdcom_lookup(rtd, SOF_AUDIO_PCM_DRV_NAME);
        struct snd_sof_dai *dai =
                snd_sof_find_dai(component, (char *)rtd->dai_link->name);
        struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
        struct snd_soc_dpcm *dpcm;

        /* no topology exists for this BE, try a common configuration */
        if (!dai) {
                dev_warn(component->dev,
                         "warning: no topology found for BE DAI %s config\n",
                         rtd->dai_link->name);

                /*  set 48k, stereo, 16bits by default */
                rate->min = 48000;
                rate->max = 48000;

                channels->min = 2;
                channels->max = 2;

                snd_mask_none(fmt);
                snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S16_LE);

                return 0;
        }

        /* read format from topology */
        snd_mask_none(fmt);

        switch (dai->comp_dai.config.frame_fmt) {
        case SOF_IPC_FRAME_S16_LE:
                snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S16_LE);
                break;
        case SOF_IPC_FRAME_S24_4LE:
                snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S24_LE);
                break;
        case SOF_IPC_FRAME_S32_LE:
                snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S32_LE);
                break;
        default:
                dev_err(component->dev, "error: No available DAI format!\n");
                return -EINVAL;
        }

        /* read rate and channels from topology */
        switch (dai->dai_config->type) {
        case SOF_DAI_INTEL_SSP:
                /* search for config to pcm params match, if not found use default */
                ssp_dai_config_pcm_params_match(sdev, (char *)rtd->dai_link->name, params);

                rate->min = dai->dai_config[dai->current_config].ssp.fsync_rate;
                rate->max = dai->dai_config[dai->current_config].ssp.fsync_rate;
                channels->min = dai->dai_config[dai->current_config].ssp.tdm_slots;
                channels->max = dai->dai_config[dai->current_config].ssp.tdm_slots;

                dev_dbg(component->dev,
                        "rate_min: %d rate_max: %d\n", rate->min, rate->max);
                dev_dbg(component->dev,
                        "channels_min: %d channels_max: %d\n",
                        channels->min, channels->max);

                break;
        case SOF_DAI_INTEL_DMIC:
                /* DMIC only supports 16 or 32 bit formats */
                if (dai->comp_dai.config.frame_fmt == SOF_IPC_FRAME_S24_4LE) {
                        dev_err(component->dev,
                                "error: invalid fmt %d for DAI type %d\n",
                                dai->comp_dai.config.frame_fmt,
                                dai->dai_config->type);
                }
                break;
        case SOF_DAI_INTEL_HDA:
                /*
                 * HDAudio does not follow the default trigger
                 * sequence due to firmware implementation
                 */
                for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_PLAYBACK, dpcm) {
                        struct snd_soc_pcm_runtime *fe = dpcm->fe;

                        fe->dai_link->trigger[SNDRV_PCM_STREAM_PLAYBACK] =
                                SND_SOC_DPCM_TRIGGER_POST;
                }
                break;
        case SOF_DAI_INTEL_ALH:
                /*
                 * Dai could run with different channel count compared with
                 * front end, so get dai channel count from topology
                 */
                channels->min = dai->dai_config->alh.channels;
                channels->max = dai->dai_config->alh.channels;
                break;
        case SOF_DAI_IMX_ESAI:
                rate->min = dai->dai_config->esai.fsync_rate;
                rate->max = dai->dai_config->esai.fsync_rate;
                channels->min = dai->dai_config->esai.tdm_slots;
                channels->max = dai->dai_config->esai.tdm_slots;

                dev_dbg(component->dev,
                        "rate_min: %d rate_max: %d\n", rate->min, rate->max);
                dev_dbg(component->dev,
                        "channels_min: %d channels_max: %d\n",
                        channels->min, channels->max);
                break;
        case SOF_DAI_IMX_SAI:
                rate->min = dai->dai_config->sai.fsync_rate;
                rate->max = dai->dai_config->sai.fsync_rate;
                channels->min = dai->dai_config->sai.tdm_slots;
                channels->max = dai->dai_config->sai.tdm_slots;

                dev_dbg(component->dev,
                        "rate_min: %d rate_max: %d\n", rate->min, rate->max);
                dev_dbg(component->dev,
                        "channels_min: %d channels_max: %d\n",
                        channels->min, channels->max);
                break;
        default:
                dev_err(component->dev, "error: invalid DAI type %d\n",
                        dai->dai_config->type);
                break;
        }

        return 0;
}
EXPORT_SYMBOL(sof_pcm_dai_link_fixup);

static int sof_pcm_probe(struct snd_soc_component *component)
{
        struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
        struct snd_sof_pdata *plat_data = sdev->pdata;
        const char *tplg_filename;
        int ret;

        /* load the default topology */
        sdev->component = component;

        tplg_filename = devm_kasprintf(sdev->dev, GFP_KERNEL,
                                       "%s/%s",
                                       plat_data->tplg_filename_prefix,
                                       plat_data->tplg_filename);
        if (!tplg_filename)
                return -ENOMEM;

        ret = snd_sof_load_topology(component, tplg_filename);
        if (ret < 0) {
                dev_err(component->dev, "error: failed to load DSP topology %d\n",
                        ret);
                return ret;
        }

        return ret;
}

static void sof_pcm_remove(struct snd_soc_component *component)
{
        /* remove topology */
        snd_soc_tplg_component_remove(component);
}

void snd_sof_new_platform_drv(struct snd_sof_dev *sdev)
{
        struct snd_soc_component_driver *pd = &sdev->plat_drv;
        struct snd_sof_pdata *plat_data = sdev->pdata;
        const char *drv_name;

        drv_name = plat_data->machine->drv_name;

        pd->name = "sof-audio-component";
        pd->probe = sof_pcm_probe;
        pd->remove = sof_pcm_remove;
        pd->open = sof_pcm_open;
        pd->close = sof_pcm_close;
        pd->hw_params = sof_pcm_hw_params;
        pd->prepare = sof_pcm_prepare;
        pd->hw_free = sof_pcm_hw_free;
        pd->trigger = sof_pcm_trigger;
        pd->pointer = sof_pcm_pointer;

#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_PROBES)
        pd->compress_ops = &sof_probe_compressed_ops;
#endif
        pd->pcm_construct = sof_pcm_new;
        pd->ignore_machine = drv_name;
        pd->be_hw_params_fixup = sof_pcm_dai_link_fixup;
        pd->be_pcm_base = SOF_BE_PCM_BASE;
        pd->use_dai_pcm_id = true;
        pd->topology_name_prefix = "sof";

         /* increment module refcount when a pcm is opened */
        pd->module_get_upon_open = 1;
}