// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Driver for Digigram miXart soundcards
 *
 * main file with alsa callbacks
 *
 * Copyright (c) 2003 by Digigram <alsa@digigram.com>
 */


#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>

#include <sound/core.h>
#include <sound/initval.h>
#include <sound/info.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "mixart.h"
#include "mixart_hwdep.h"
#include "mixart_core.h"
#include "mixart_mixer.h"

#define CARD_NAME "miXart"

MODULE_AUTHOR("Digigram <alsa@digigram.com>");
MODULE_DESCRIPTION("Digigram " CARD_NAME);
MODULE_LICENSE("GPL");

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;             /* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;              /* ID for this card */
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;     /* Enable this card */

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for Digigram " CARD_NAME " soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for Digigram " CARD_NAME " soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable Digigram " CARD_NAME " soundcard.");

/*
 */

static const struct pci_device_id snd_mixart_ids[] = {
        { PCI_VDEVICE(MOTOROLA, 0x0003), 0, }, /* MC8240 */
        { 0, }
};

MODULE_DEVICE_TABLE(pci, snd_mixart_ids);


static int mixart_set_pipe_state(struct mixart_mgr *mgr,
                                 struct mixart_pipe *pipe, int start)
{
        struct mixart_group_state_req group_state;
        struct mixart_group_state_resp group_state_resp;
        struct mixart_msg request;
        int err;
        u32 system_msg_uid;

        switch(pipe->status) {
        case PIPE_RUNNING:
        case PIPE_CLOCK_SET:
                if(start) return 0; /* already started */
                break;
        case PIPE_STOPPED:
                if(!start) return 0; /* already stopped */
                break;
        default:
                dev_err(&mgr->pci->dev,
                        "error mixart_set_pipe_state called with wrong pipe->status!\n");
                return -EINVAL;      /* function called with wrong pipe status */
        }

        system_msg_uid = 0x12345678; /* the event ! (take care: the MSB and two LSB's have to be 0) */

        /* wait on the last MSG_SYSTEM_SEND_SYNCHRO_CMD command to be really finished */

        request.message_id = MSG_SYSTEM_WAIT_SYNCHRO_CMD;
        request.uid = (struct mixart_uid){0,0};
        request.data = &system_msg_uid;
        request.size = sizeof(system_msg_uid);

        err = snd_mixart_send_msg_wait_notif(mgr, &request, system_msg_uid);
        if(err) {
                dev_err(&mgr->pci->dev,
                        "error : MSG_SYSTEM_WAIT_SYNCHRO_CMD was not notified !\n");
                return err;
        }

        /* start or stop the pipe (1 pipe) */

        memset(&group_state, 0, sizeof(group_state));
        group_state.pipe_count = 1;
        group_state.pipe_uid = pipe->group_uid;

        if(start)
                request.message_id = MSG_STREAM_START_STREAM_GRP_PACKET;
        else
                request.message_id = MSG_STREAM_STOP_STREAM_GRP_PACKET;

        request.uid = pipe->group_uid; /*(struct mixart_uid){0,0};*/
        request.data = &group_state;
        request.size = sizeof(group_state);

        err = snd_mixart_send_msg(mgr, &request, sizeof(group_state_resp), &group_state_resp);
        if (err < 0 || group_state_resp.txx_status != 0) {
                dev_err(&mgr->pci->dev,
                        "error MSG_STREAM_ST***_STREAM_GRP_PACKET err=%x stat=%x !\n",
                        err, group_state_resp.txx_status);
                return -EINVAL;
        }

        if(start) {
                u32 stat = 0;

                group_state.pipe_count = 0; /* in case of start same command once again with pipe_count=0 */

                err = snd_mixart_send_msg(mgr, &request, sizeof(group_state_resp), &group_state_resp);
                if (err < 0 || group_state_resp.txx_status != 0) {
                        dev_err(&mgr->pci->dev,
                                "error MSG_STREAM_START_STREAM_GRP_PACKET err=%x stat=%x !\n",
                                err, group_state_resp.txx_status);
                        return -EINVAL;
                }

                /* in case of start send a synchro top */

                request.message_id = MSG_SYSTEM_SEND_SYNCHRO_CMD;
                request.uid = (struct mixart_uid){0,0};
                request.data = NULL;
                request.size = 0;

                err = snd_mixart_send_msg(mgr, &request, sizeof(stat), &stat);
                if (err < 0 || stat != 0) {
                        dev_err(&mgr->pci->dev,
                                "error MSG_SYSTEM_SEND_SYNCHRO_CMD err=%x stat=%x !\n",
                                err, stat);
                        return -EINVAL;
                }

                pipe->status = PIPE_RUNNING;
        }
        else /* !start */
                pipe->status = PIPE_STOPPED;

        return 0;
}


static int mixart_set_clock(struct mixart_mgr *mgr,
                            struct mixart_pipe *pipe, unsigned int rate)
{
        struct mixart_msg request;
        struct mixart_clock_properties clock_properties;
        struct mixart_clock_properties_resp clock_prop_resp;
        int err;

        switch(pipe->status) {
        case PIPE_CLOCK_SET:
                break;
        case PIPE_RUNNING:
                if(rate != 0)
                        break;
                fallthrough;
        default:
                if(rate == 0)
                        return 0; /* nothing to do */
                else {
                        dev_err(&mgr->pci->dev,
                                "error mixart_set_clock(%d) called with wrong pipe->status !\n",
                                rate);
                        return -EINVAL;
                }
        }

        memset(&clock_properties, 0, sizeof(clock_properties));
        clock_properties.clock_generic_type = (rate != 0) ? CGT_INTERNAL_CLOCK : CGT_NO_CLOCK;
        clock_properties.clock_mode = CM_STANDALONE;
        clock_properties.frequency = rate;
        clock_properties.nb_callers = 1; /* only one entry in uid_caller ! */
        clock_properties.uid_caller = pipe->group_uid;

        dev_dbg(&mgr->pci->dev, "mixart_set_clock to %d kHz\n", rate);

        request.message_id = MSG_CLOCK_SET_PROPERTIES;
        request.uid = mgr->uid_console_manager;
        request.data = &clock_properties;
        request.size = sizeof(clock_properties);

        err = snd_mixart_send_msg(mgr, &request, sizeof(clock_prop_resp), &clock_prop_resp);
        if (err < 0 || clock_prop_resp.status != 0 || clock_prop_resp.clock_mode != CM_STANDALONE) {
                dev_err(&mgr->pci->dev,
                        "error MSG_CLOCK_SET_PROPERTIES err=%x stat=%x mod=%x !\n",
                        err, clock_prop_resp.status, clock_prop_resp.clock_mode);
                return -EINVAL;
        }

        if(rate)  pipe->status = PIPE_CLOCK_SET;
        else      pipe->status = PIPE_RUNNING;

        return 0;
}


/*
 *  Allocate or reference output pipe for analog IOs (pcmp0/1)
 */
struct mixart_pipe *
snd_mixart_add_ref_pipe(struct snd_mixart *chip, int pcm_number, int capture,
                        int monitoring)
{
        int stream_count;
        struct mixart_pipe *pipe;
        struct mixart_msg request;

        if(capture) {
                if (pcm_number == MIXART_PCM_ANALOG) {
                        pipe = &(chip->pipe_in_ana);  /* analog inputs */
                } else {
                        pipe = &(chip->pipe_in_dig); /* digital inputs */
                }
                request.message_id = MSG_STREAM_ADD_OUTPUT_GROUP;
                stream_count = MIXART_CAPTURE_STREAMS;
        } else {
                if (pcm_number == MIXART_PCM_ANALOG) {
                        pipe = &(chip->pipe_out_ana);  /* analog outputs */
                } else {
                        pipe = &(chip->pipe_out_dig);  /* digital outputs */
                }
                request.message_id = MSG_STREAM_ADD_INPUT_GROUP;
                stream_count = MIXART_PLAYBACK_STREAMS;
        }

        /* a new stream is opened and there are already all streams in use */
        if( (monitoring == 0) && (pipe->references >= stream_count) ) {
                return NULL;
        }

        /* pipe is not yet defined */
        if( pipe->status == PIPE_UNDEFINED ) {
                int err, i;
                struct {
                        struct mixart_streaming_group_req sgroup_req;
                        struct mixart_streaming_group sgroup_resp;
                } *buf;

                dev_dbg(chip->card->dev,
                        "add_ref_pipe audio chip(%d) pcm(%d)\n",
                        chip->chip_idx, pcm_number);

                buf = kmalloc_obj(*buf);
                if (!buf)
                        return NULL;

                request.uid = (struct mixart_uid){0,0};      /* should be StreamManagerUID, but zero is OK if there is only one ! */
                request.data = &buf->sgroup_req;
                request.size = sizeof(buf->sgroup_req);

                memset(&buf->sgroup_req, 0, sizeof(buf->sgroup_req));

                buf->sgroup_req.stream_count = stream_count;
                buf->sgroup_req.channel_count = 2;
                buf->sgroup_req.latency = 256;
                buf->sgroup_req.connector = pipe->uid_left_connector;  /* the left connector */

                for (i=0; i<stream_count; i++) {
                        int j;
                        struct mixart_flowinfo *flowinfo;
                        struct mixart_bufferinfo *bufferinfo;
                        
                        /* we don't yet know the format, so config 16 bit pcm audio for instance */
                        buf->sgroup_req.stream_info[i].size_max_byte_frame = 1024;
                        buf->sgroup_req.stream_info[i].size_max_sample_frame = 256;
                        buf->sgroup_req.stream_info[i].nb_bytes_max_per_sample = MIXART_FLOAT_P__4_0_TO_HEX; /* is 4.0f */

                        /* find the right bufferinfo_array */
                        j = (chip->chip_idx * MIXART_MAX_STREAM_PER_CARD) + (pcm_number * (MIXART_PLAYBACK_STREAMS + MIXART_CAPTURE_STREAMS)) + i;
                        if(capture) j += MIXART_PLAYBACK_STREAMS; /* in the array capture is behind playback */

                        buf->sgroup_req.flow_entry[i] = j;

                        flowinfo = (struct mixart_flowinfo *)chip->mgr->flowinfo.area;
                        flowinfo[j].bufferinfo_array_phy_address = (u32)chip->mgr->bufferinfo.addr + (j * sizeof(struct mixart_bufferinfo));
                        flowinfo[j].bufferinfo_count = 1;               /* 1 will set the miXart to ring-buffer mode ! */

                        bufferinfo = (struct mixart_bufferinfo *)chip->mgr->bufferinfo.area;
                        bufferinfo[j].buffer_address = 0;               /* buffer is not yet allocated */
                        bufferinfo[j].available_length = 0;             /* buffer is not yet allocated */

                        /* construct the identifier of the stream buffer received in the interrupts ! */
                        bufferinfo[j].buffer_id = (chip->chip_idx << MIXART_NOTIFY_CARD_OFFSET) + (pcm_number << MIXART_NOTIFY_PCM_OFFSET ) + i;
                        if(capture) {
                                bufferinfo[j].buffer_id |= MIXART_NOTIFY_CAPT_MASK;
                        }
                }

                err = snd_mixart_send_msg(chip->mgr, &request, sizeof(buf->sgroup_resp), &buf->sgroup_resp);
                if((err < 0) || (buf->sgroup_resp.status != 0)) {
                        dev_err(chip->card->dev,
                                "error MSG_STREAM_ADD_**PUT_GROUP err=%x stat=%x !\n",
                                err, buf->sgroup_resp.status);
                        kfree(buf);
                        return NULL;
                }

                pipe->group_uid = buf->sgroup_resp.group;     /* id of the pipe, as returned by embedded */
                pipe->stream_count = buf->sgroup_resp.stream_count;
                /* pipe->stream_uid[i] = buf->sgroup_resp.stream[i].stream_uid; */

                pipe->status = PIPE_STOPPED;
                kfree(buf);
        }

        if(monitoring)  pipe->monitoring = 1;
        else            pipe->references++;

        return pipe;
}


int snd_mixart_kill_ref_pipe(struct mixart_mgr *mgr,
                             struct mixart_pipe *pipe, int monitoring)
{
        int err = 0;

        if(pipe->status == PIPE_UNDEFINED)
                return 0;

        if(monitoring)
                pipe->monitoring = 0;
        else
                pipe->references--;

        if((pipe->references <= 0) && (pipe->monitoring == 0)) {

                struct mixart_msg request;
                struct mixart_delete_group_resp delete_resp;

                /* release the clock */
                err = mixart_set_clock( mgr, pipe, 0);
                if( err < 0 ) {
                        dev_err(&mgr->pci->dev,
                                "mixart_set_clock(0) return error!\n");
                }

                /* stop the pipe */
                err = mixart_set_pipe_state(mgr, pipe, 0);
                if( err < 0 ) {
                        dev_err(&mgr->pci->dev, "error stopping pipe!\n");
                }

                request.message_id = MSG_STREAM_DELETE_GROUP;
                request.uid = (struct mixart_uid){0,0};
                request.data = &pipe->group_uid;            /* the streaming group ! */
                request.size = sizeof(pipe->group_uid);

                /* delete the pipe */
                err = snd_mixart_send_msg(mgr, &request, sizeof(delete_resp), &delete_resp);
                if ((err < 0) || (delete_resp.status != 0)) {
                        dev_err(&mgr->pci->dev,
                                "error MSG_STREAM_DELETE_GROUP err(%x), status(%x)\n",
                                err, delete_resp.status);
                }

                pipe->group_uid = (struct mixart_uid){0,0};
                pipe->stream_count = 0;
                pipe->status = PIPE_UNDEFINED;
        }

        return err;
}

static int mixart_set_stream_state(struct mixart_stream *stream, int start)
{
        struct snd_mixart *chip;
        struct mixart_stream_state_req stream_state_req;
        struct mixart_msg request;

        if(!stream->substream)
                return -EINVAL;

        memset(&stream_state_req, 0, sizeof(stream_state_req));
        stream_state_req.stream_count = 1;
        stream_state_req.stream_info.stream_desc.uid_pipe = stream->pipe->group_uid;
        stream_state_req.stream_info.stream_desc.stream_idx = stream->substream->number;

        if (stream->substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                request.message_id = start ? MSG_STREAM_START_INPUT_STAGE_PACKET : MSG_STREAM_STOP_INPUT_STAGE_PACKET;
        else
                request.message_id = start ? MSG_STREAM_START_OUTPUT_STAGE_PACKET : MSG_STREAM_STOP_OUTPUT_STAGE_PACKET;

        request.uid = (struct mixart_uid){0,0};
        request.data = &stream_state_req;
        request.size = sizeof(stream_state_req);

        stream->abs_period_elapsed = 0;            /* reset stream pos      */
        stream->buf_periods = 0;
        stream->buf_period_frag = 0;

        chip = snd_pcm_substream_chip(stream->substream);

        return snd_mixart_send_msg_nonblock(chip->mgr, &request);
}

/*
 *  Trigger callback
 */

static int snd_mixart_trigger(struct snd_pcm_substream *subs, int cmd)
{
        struct mixart_stream *stream = subs->runtime->private_data;

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:

                dev_dbg(subs->pcm->card->dev, "SNDRV_PCM_TRIGGER_START\n");

                /* START_STREAM */
                if( mixart_set_stream_state(stream, 1) )
                        return -EINVAL;

                stream->status = MIXART_STREAM_STATUS_RUNNING;

                break;
        case SNDRV_PCM_TRIGGER_STOP:

                /* STOP_STREAM */
                if( mixart_set_stream_state(stream, 0) )
                        return -EINVAL;

                stream->status = MIXART_STREAM_STATUS_OPEN;

                dev_dbg(subs->pcm->card->dev, "SNDRV_PCM_TRIGGER_STOP\n");

                break;

        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                /* TODO */
                stream->status = MIXART_STREAM_STATUS_PAUSE;
                dev_dbg(subs->pcm->card->dev, "SNDRV_PCM_PAUSE_PUSH\n");
                break;
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                /* TODO */
                stream->status = MIXART_STREAM_STATUS_RUNNING;
                dev_dbg(subs->pcm->card->dev, "SNDRV_PCM_PAUSE_RELEASE\n");
                break;
        default:
                return -EINVAL;
        }
        return 0;
}

static int mixart_sync_nonblock_events(struct mixart_mgr *mgr)
{
        unsigned long timeout = jiffies + HZ;
        while (atomic_read(&mgr->msg_processed) > 0) {
                if (time_after(jiffies, timeout)) {
                        dev_err(&mgr->pci->dev,
                                "mixart: cannot process nonblock events!\n");
                        return -EBUSY;
                }
                schedule_timeout_uninterruptible(1);
        }
        return 0;
}

/*
 *  prepare callback for all pcms
 */
static int snd_mixart_prepare(struct snd_pcm_substream *subs)
{
        struct snd_mixart *chip = snd_pcm_substream_chip(subs);
        struct mixart_stream *stream = subs->runtime->private_data;

        /* TODO de façon non bloquante, réappliquer les hw_params (rate, bits, codec) */

        dev_dbg(chip->card->dev, "snd_mixart_prepare\n");

        mixart_sync_nonblock_events(chip->mgr);

        /* only the first stream can choose the sample rate */
        /* the further opened streams will be limited to its frequency (see open) */
        if(chip->mgr->ref_count_rate == 1)
                chip->mgr->sample_rate = subs->runtime->rate;

        /* set the clock only once (first stream) on the same pipe */
        if(stream->pipe->references == 1) {
                if( mixart_set_clock(chip->mgr, stream->pipe, subs->runtime->rate) )
                        return -EINVAL;
        }

        return 0;
}


static int mixart_set_format(struct mixart_stream *stream, snd_pcm_format_t format)
{
        int err;
        struct snd_mixart *chip;
        struct mixart_msg request;
        struct mixart_stream_param_desc stream_param;
        struct mixart_return_uid resp;

        chip = snd_pcm_substream_chip(stream->substream);

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

        stream_param.coding_type = CT_LINEAR;
        stream_param.number_of_channel = stream->channels;

        stream_param.sampling_freq = chip->mgr->sample_rate;
        if(stream_param.sampling_freq == 0)
                stream_param.sampling_freq = 44100; /* if frequency not yet defined, use some default */

        switch(format){
        case SNDRV_PCM_FORMAT_U8:
                stream_param.sample_type = ST_INTEGER_8;
                stream_param.sample_size = 8;
                break;
        case SNDRV_PCM_FORMAT_S16_LE:
                stream_param.sample_type = ST_INTEGER_16LE;
                stream_param.sample_size = 16;
                break;
        case SNDRV_PCM_FORMAT_S16_BE:
                stream_param.sample_type = ST_INTEGER_16BE;
                stream_param.sample_size = 16;
                break;
        case SNDRV_PCM_FORMAT_S24_3LE:
                stream_param.sample_type = ST_INTEGER_24LE;
                stream_param.sample_size = 24;
                break;
        case SNDRV_PCM_FORMAT_S24_3BE:
                stream_param.sample_type = ST_INTEGER_24BE;
                stream_param.sample_size = 24;
                break;
        case SNDRV_PCM_FORMAT_FLOAT_LE:
                stream_param.sample_type = ST_FLOATING_POINT_32LE;
                stream_param.sample_size = 32;
                break;
        case  SNDRV_PCM_FORMAT_FLOAT_BE:
                stream_param.sample_type = ST_FLOATING_POINT_32BE;
                stream_param.sample_size = 32;
                break;
        default:
                dev_err(chip->card->dev,
                        "error mixart_set_format() : unknown format\n");
                return -EINVAL;
        }

        dev_dbg(chip->card->dev,
                "set SNDRV_PCM_FORMAT sample_type(%d) sample_size(%d) freq(%d) channels(%d)\n",
                   stream_param.sample_type, stream_param.sample_size, stream_param.sampling_freq, stream->channels);

        /* TODO: what else to configure ? */
        /* stream_param.samples_per_frame = 2; */
        /* stream_param.bytes_per_frame = 4; */
        /* stream_param.bytes_per_sample = 2; */

        stream_param.pipe_count = 1;      /* set to 1 */
        stream_param.stream_count = 1;    /* set to 1 */
        stream_param.stream_desc.uid_pipe = stream->pipe->group_uid;
        stream_param.stream_desc.stream_idx = stream->substream->number;

        request.message_id = MSG_STREAM_SET_INPUT_STAGE_PARAM;
        request.uid = (struct mixart_uid){0,0};
        request.data = &stream_param;
        request.size = sizeof(stream_param);

        err = snd_mixart_send_msg(chip->mgr, &request, sizeof(resp), &resp);
        if((err < 0) || resp.error_code) {
                dev_err(chip->card->dev,
                        "MSG_STREAM_SET_INPUT_STAGE_PARAM err=%x; resp=%x\n",
                        err, resp.error_code);
                return -EINVAL;
        }
        return 0;
}


/*
 *  HW_PARAMS callback for all pcms
 */
static int snd_mixart_hw_params(struct snd_pcm_substream *subs,
                                struct snd_pcm_hw_params *hw)
{
        struct snd_mixart *chip = snd_pcm_substream_chip(subs);
        struct mixart_mgr *mgr = chip->mgr;
        struct mixart_stream *stream = subs->runtime->private_data;
        snd_pcm_format_t format;
        int err;
        int channels;

        /* set up channels */
        channels = params_channels(hw);

        /*  set up format for the stream */
        format = params_format(hw);

        guard(mutex)(&mgr->setup_mutex);

        /* update the stream levels */
        if( stream->pcm_number <= MIXART_PCM_DIGITAL ) {
                int is_aes = stream->pcm_number > MIXART_PCM_ANALOG;
                if( subs->stream == SNDRV_PCM_STREAM_PLAYBACK )
                        mixart_update_playback_stream_level(chip, is_aes, subs->number);
                else
                        mixart_update_capture_stream_level( chip, is_aes);
        }

        stream->channels = channels;

        /* set the format to the board */
        err = mixart_set_format(stream, format);
        if (err < 0)
                return err;

        if (subs->runtime->buffer_changed) {
                struct mixart_bufferinfo *bufferinfo;
                int i = (chip->chip_idx * MIXART_MAX_STREAM_PER_CARD) + (stream->pcm_number * (MIXART_PLAYBACK_STREAMS+MIXART_CAPTURE_STREAMS)) + subs->number;
                if( subs->stream == SNDRV_PCM_STREAM_CAPTURE ) {
                        i += MIXART_PLAYBACK_STREAMS; /* in array capture is behind playback */
                }
                
                bufferinfo = (struct mixart_bufferinfo *)chip->mgr->bufferinfo.area;
                bufferinfo[i].buffer_address = subs->runtime->dma_addr;
                bufferinfo[i].available_length = subs->runtime->dma_bytes;
                /* bufferinfo[i].buffer_id  is already defined */

                dev_dbg(chip->card->dev,
                        "snd_mixart_hw_params(pcm %d) : dma_addr(%x) dma_bytes(%x) subs-number(%d)\n",
                        i, bufferinfo[i].buffer_address,
                                bufferinfo[i].available_length,
                                subs->number);
        }

        return 0;
}

static int snd_mixart_hw_free(struct snd_pcm_substream *subs)
{
        struct snd_mixart *chip = snd_pcm_substream_chip(subs);
        mixart_sync_nonblock_events(chip->mgr);
        return 0;
}



/*
 *  TODO CONFIGURATION SPACE for all pcms, mono pcm must update channels_max
 */
static const struct snd_pcm_hardware snd_mixart_analog_caps =
{
        .info             = ( SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                              SNDRV_PCM_INFO_MMAP_VALID |
                              SNDRV_PCM_INFO_PAUSE),
        .formats          = ( SNDRV_PCM_FMTBIT_U8 |
                              SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
                              SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |
                              SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE ),
        .rates            = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
        .rate_min         = 8000,
        .rate_max         = 48000,
        .channels_min     = 1,
        .channels_max     = 2,
        .buffer_bytes_max = (32*1024),
        .period_bytes_min = 256,                  /* 256 frames U8 mono*/
        .period_bytes_max = (16*1024),
        .periods_min      = 2,
        .periods_max      = (32*1024/256),
};

static const struct snd_pcm_hardware snd_mixart_digital_caps =
{
        .info             = ( SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                              SNDRV_PCM_INFO_MMAP_VALID |
                              SNDRV_PCM_INFO_PAUSE),
        .formats          = ( SNDRV_PCM_FMTBIT_U8 |
                              SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
                              SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |
                              SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE ),
        .rates            = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
        .rate_min         = 32000,
        .rate_max         = 48000,
        .channels_min     = 1,
        .channels_max     = 2,
        .buffer_bytes_max = (32*1024),
        .period_bytes_min = 256,                  /* 256 frames U8 mono*/
        .period_bytes_max = (16*1024),
        .periods_min      = 2,
        .periods_max      = (32*1024/256),
};


static int snd_mixart_playback_open(struct snd_pcm_substream *subs)
{
        struct snd_mixart            *chip = snd_pcm_substream_chip(subs);
        struct mixart_mgr        *mgr = chip->mgr;
        struct snd_pcm_runtime *runtime = subs->runtime;
        struct snd_pcm *pcm = subs->pcm;
        struct mixart_stream     *stream;
        struct mixart_pipe       *pipe;
        int err = 0;
        int pcm_number;

        guard(mutex)(&mgr->setup_mutex);

        if ( pcm == chip->pcm ) {
                pcm_number = MIXART_PCM_ANALOG;
                runtime->hw = snd_mixart_analog_caps;
        } else {
                snd_BUG_ON(pcm != chip->pcm_dig);
                pcm_number = MIXART_PCM_DIGITAL;
                runtime->hw = snd_mixart_digital_caps;
        }
        dev_dbg(chip->card->dev,
                "snd_mixart_playback_open C%d/P%d/Sub%d\n",
                chip->chip_idx, pcm_number, subs->number);

        /* get stream info */
        stream = &(chip->playback_stream[pcm_number][subs->number]);

        if (stream->status != MIXART_STREAM_STATUS_FREE){
                /* streams in use */
                dev_err(chip->card->dev,
                        "snd_mixart_playback_open C%d/P%d/Sub%d in use\n",
                        chip->chip_idx, pcm_number, subs->number);
                return -EBUSY;
        }

        /* get pipe pointer (out pipe) */
        pipe = snd_mixart_add_ref_pipe(chip, pcm_number, 0, 0);

        if (pipe == NULL)
                return -EINVAL;

        /* start the pipe if necessary */
        err = mixart_set_pipe_state(chip->mgr, pipe, 1);
        if( err < 0 ) {
                dev_err(chip->card->dev, "error starting pipe!\n");
                snd_mixart_kill_ref_pipe(chip->mgr, pipe, 0);
                return -EINVAL;
        }

        stream->pipe        = pipe;
        stream->pcm_number  = pcm_number;
        stream->status      = MIXART_STREAM_STATUS_OPEN;
        stream->substream   = subs;
        stream->channels    = 0; /* not configured yet */

        runtime->private_data = stream;

        snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
        snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 64);

        /* if a sample rate is already used, another stream cannot change */
        if(mgr->ref_count_rate++) {
                if(mgr->sample_rate) {
                        runtime->hw.rate_min = runtime->hw.rate_max = mgr->sample_rate;
                }
        }

        return 0;
}


static int snd_mixart_capture_open(struct snd_pcm_substream *subs)
{
        struct snd_mixart            *chip = snd_pcm_substream_chip(subs);
        struct mixart_mgr        *mgr = chip->mgr;
        struct snd_pcm_runtime *runtime = subs->runtime;
        struct snd_pcm *pcm = subs->pcm;
        struct mixart_stream     *stream;
        struct mixart_pipe       *pipe;
        int err = 0;
        int pcm_number;

        guard(mutex)(&mgr->setup_mutex);

        if ( pcm == chip->pcm ) {
                pcm_number = MIXART_PCM_ANALOG;
                runtime->hw = snd_mixart_analog_caps;
        } else {
                snd_BUG_ON(pcm != chip->pcm_dig);
                pcm_number = MIXART_PCM_DIGITAL;
                runtime->hw = snd_mixart_digital_caps;
        }

        runtime->hw.channels_min = 2; /* for instance, no mono */

        dev_dbg(chip->card->dev, "snd_mixart_capture_open C%d/P%d/Sub%d\n",
                chip->chip_idx, pcm_number, subs->number);

        /* get stream info */
        stream = &(chip->capture_stream[pcm_number]);

        if (stream->status != MIXART_STREAM_STATUS_FREE){
                /* streams in use */
                dev_err(chip->card->dev,
                        "snd_mixart_capture_open C%d/P%d/Sub%d in use\n",
                        chip->chip_idx, pcm_number, subs->number);
                return -EBUSY;
        }

        /* get pipe pointer (in pipe) */
        pipe = snd_mixart_add_ref_pipe(chip, pcm_number, 1, 0);

        if (pipe == NULL)
                return -EINVAL;

        /* start the pipe if necessary */
        err = mixart_set_pipe_state(chip->mgr, pipe, 1);
        if( err < 0 ) {
                dev_err(chip->card->dev, "error starting pipe!\n");
                snd_mixart_kill_ref_pipe(chip->mgr, pipe, 0);
                return -EINVAL;
        }

        stream->pipe        = pipe;
        stream->pcm_number  = pcm_number;
        stream->status      = MIXART_STREAM_STATUS_OPEN;
        stream->substream   = subs;
        stream->channels    = 0; /* not configured yet */

        runtime->private_data = stream;

        snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
        snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 64);

        /* if a sample rate is already used, another stream cannot change */
        if(mgr->ref_count_rate++) {
                if(mgr->sample_rate) {
                        runtime->hw.rate_min = runtime->hw.rate_max = mgr->sample_rate;
                }
        }

        return 0;
}



static int snd_mixart_close(struct snd_pcm_substream *subs)
{
        struct snd_mixart *chip = snd_pcm_substream_chip(subs);
        struct mixart_mgr *mgr = chip->mgr;
        struct mixart_stream *stream = subs->runtime->private_data;

        guard(mutex)(&mgr->setup_mutex);

        dev_dbg(chip->card->dev, "snd_mixart_close C%d/P%d/Sub%d\n",
                chip->chip_idx, stream->pcm_number, subs->number);

        /* sample rate released */
        if(--mgr->ref_count_rate == 0) {
                mgr->sample_rate = 0;
        }

        /* delete pipe */
        if (snd_mixart_kill_ref_pipe(mgr, stream->pipe, 0 ) < 0) {

                dev_err(chip->card->dev,
                        "error snd_mixart_kill_ref_pipe C%dP%d\n",
                        chip->chip_idx, stream->pcm_number);
        }

        stream->pipe      = NULL;
        stream->status    = MIXART_STREAM_STATUS_FREE;
        stream->substream = NULL;

        return 0;
}


static snd_pcm_uframes_t snd_mixart_stream_pointer(struct snd_pcm_substream *subs)
{
        struct snd_pcm_runtime *runtime = subs->runtime;
        struct mixart_stream   *stream  = runtime->private_data;

        return (snd_pcm_uframes_t)((stream->buf_periods * runtime->period_size) + stream->buf_period_frag);
}



static const struct snd_pcm_ops snd_mixart_playback_ops = {
        .open      = snd_mixart_playback_open,
        .close     = snd_mixart_close,
        .prepare   = snd_mixart_prepare,
        .hw_params = snd_mixart_hw_params,
        .hw_free   = snd_mixart_hw_free,
        .trigger   = snd_mixart_trigger,
        .pointer   = snd_mixart_stream_pointer,
};

static const struct snd_pcm_ops snd_mixart_capture_ops = {
        .open      = snd_mixart_capture_open,
        .close     = snd_mixart_close,
        .prepare   = snd_mixart_prepare,
        .hw_params = snd_mixart_hw_params,
        .hw_free   = snd_mixart_hw_free,
        .trigger   = snd_mixart_trigger,
        .pointer   = snd_mixart_stream_pointer,
};

static void preallocate_buffers(struct snd_mixart *chip, struct snd_pcm *pcm)
{
#if 0
        struct snd_pcm_substream *subs;
        int stream;

        for (stream = 0; stream < 2; stream++) {
                int idx = 0;
                for (subs = pcm->streams[stream].substream; subs; subs = subs->next, idx++)
                        /* set up the unique device id with the chip index */
                        subs->dma_device.id = subs->pcm->device << 16 |
                                subs->stream << 8 | (subs->number + 1) |
                                (chip->chip_idx + 1) << 24;
        }
#endif
        snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
                                       &chip->mgr->pci->dev,
                                       32*1024, 32*1024);
}

/*
 */
static int snd_mixart_pcm_analog(struct snd_mixart *chip)
{
        int err;
        struct snd_pcm *pcm;
        char name[32];

        sprintf(name, "miXart analog %d", chip->chip_idx);
        err = snd_pcm_new(chip->card, name, MIXART_PCM_ANALOG,
                          MIXART_PLAYBACK_STREAMS,
                          MIXART_CAPTURE_STREAMS, &pcm);
        if (err < 0) {
                dev_err(chip->card->dev,
                        "cannot create the analog pcm %d\n", chip->chip_idx);
                return err;
        }

        pcm->private_data = chip;

        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_mixart_playback_ops);
        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_mixart_capture_ops);

        pcm->info_flags = 0;
        pcm->nonatomic = true;
        strscpy(pcm->name, name);

        preallocate_buffers(chip, pcm);

        chip->pcm = pcm;
        return 0;
}


/*
 */
static int snd_mixart_pcm_digital(struct snd_mixart *chip)
{
        int err;
        struct snd_pcm *pcm;
        char name[32];

        sprintf(name, "miXart AES/EBU %d", chip->chip_idx);
        err = snd_pcm_new(chip->card, name, MIXART_PCM_DIGITAL,
                          MIXART_PLAYBACK_STREAMS,
                          MIXART_CAPTURE_STREAMS, &pcm);
        if (err < 0) {
                dev_err(chip->card->dev,
                        "cannot create the digital pcm %d\n", chip->chip_idx);
                return err;
        }

        pcm->private_data = chip;

        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_mixart_playback_ops);
        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_mixart_capture_ops);

        pcm->info_flags = 0;
        pcm->nonatomic = true;
        strscpy(pcm->name, name);

        preallocate_buffers(chip, pcm);

        chip->pcm_dig = pcm;
        return 0;
}

static int snd_mixart_chip_free(struct snd_mixart *chip)
{
        kfree(chip);
        return 0;
}

static int snd_mixart_chip_dev_free(struct snd_device *device)
{
        struct snd_mixart *chip = device->device_data;
        return snd_mixart_chip_free(chip);
}


/*
 */
static int snd_mixart_create(struct mixart_mgr *mgr, struct snd_card *card, int idx)
{
        int err;
        struct snd_mixart *chip;
        static const struct snd_device_ops ops = {
                .dev_free = snd_mixart_chip_dev_free,
        };

        chip = kzalloc_obj(*chip);
        if (!chip)
                return -ENOMEM;

        chip->card = card;
        chip->chip_idx = idx;
        chip->mgr = mgr;
        card->sync_irq = mgr->irq;

        err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
        if (err < 0) {
                snd_mixart_chip_free(chip);
                return err;
        }

        mgr->chip[idx] = chip;
        return 0;
}

int snd_mixart_create_pcm(struct snd_mixart* chip)
{
        int err;

        err = snd_mixart_pcm_analog(chip);
        if (err < 0)
                return err;

        if(chip->mgr->board_type == MIXART_DAUGHTER_TYPE_AES) {

                err = snd_mixart_pcm_digital(chip);
                if (err < 0)
                        return err;
        }
        return err;
}


/*
 * release all the cards assigned to a manager instance
 */
static int snd_mixart_free(struct mixart_mgr *mgr)
{
        unsigned int i;

        for (i = 0; i < mgr->num_cards; i++) {
                if (mgr->chip[i])
                        snd_card_free(mgr->chip[i]->card);
        }

        /* stop mailbox */
        snd_mixart_exit_mailbox(mgr);

        /* release irq  */
        if (mgr->irq >= 0)
                free_irq(mgr->irq, mgr);

        /* reset board if some firmware was loaded */
        if(mgr->dsp_loaded) {
                snd_mixart_reset_board(mgr);
                dev_dbg(&mgr->pci->dev, "reset miXart !\n");
        }

        /* release the i/o ports */
        for (i = 0; i < 2; ++i)
                iounmap(mgr->mem[i].virt);

        pci_release_regions(mgr->pci);

        /* free flowarray */
        if(mgr->flowinfo.area) {
                snd_dma_free_pages(&mgr->flowinfo);
                mgr->flowinfo.area = NULL;
        }
        /* free bufferarray */
        if(mgr->bufferinfo.area) {
                snd_dma_free_pages(&mgr->bufferinfo);
                mgr->bufferinfo.area = NULL;
        }

        pci_disable_device(mgr->pci);
        kfree(mgr);
        return 0;
}

/*
 * proc interface
 */

/*
  mixart_BA0 proc interface for BAR 0 - read callback
 */
static ssize_t snd_mixart_BA0_read(struct snd_info_entry *entry,
                                   void *file_private_data,
                                   struct file *file, char __user *buf,
                                   size_t count, loff_t pos)
{
        struct mixart_mgr *mgr = entry->private_data;

        count = count & ~3; /* make sure the read size is a multiple of 4 bytes */
        if (copy_to_user_fromio(buf, MIXART_MEM(mgr, pos), count))
                return -EFAULT;
        return count;
}

/*
  mixart_BA1 proc interface for BAR 1 - read callback
 */
static ssize_t snd_mixart_BA1_read(struct snd_info_entry *entry,
                                   void *file_private_data,
                                   struct file *file, char __user *buf,
                                   size_t count, loff_t pos)
{
        struct mixart_mgr *mgr = entry->private_data;

        count = count & ~3; /* make sure the read size is a multiple of 4 bytes */
        if (copy_to_user_fromio(buf, MIXART_REG(mgr, pos), count))
                return -EFAULT;
        return count;
}

static const struct snd_info_entry_ops snd_mixart_proc_ops_BA0 = {
        .read   = snd_mixart_BA0_read,
};

static const struct snd_info_entry_ops snd_mixart_proc_ops_BA1 = {
        .read   = snd_mixart_BA1_read,
};


static void snd_mixart_proc_read(struct snd_info_entry *entry, 
                                 struct snd_info_buffer *buffer)
{
        struct snd_mixart *chip = entry->private_data;        
        u32 ref; 

        snd_iprintf(buffer, "Digigram miXart (alsa card %d)\n\n", chip->chip_idx);

        /* stats available when embedded OS is running */
        if (chip->mgr->dsp_loaded & ( 1 << MIXART_MOTHERBOARD_ELF_INDEX)) {
                snd_iprintf(buffer, "- hardware -\n");
                switch (chip->mgr->board_type ) {
                case MIXART_DAUGHTER_TYPE_NONE     : snd_iprintf(buffer, "\tmiXart8 (no daughter board)\n\n"); break;
                case MIXART_DAUGHTER_TYPE_AES      : snd_iprintf(buffer, "\tmiXart8 AES/EBU\n\n"); break;
                case MIXART_DAUGHTER_TYPE_COBRANET : snd_iprintf(buffer, "\tmiXart8 Cobranet\n\n"); break;
                default:                             snd_iprintf(buffer, "\tUNKNOWN!\n\n"); break;
                }

                snd_iprintf(buffer, "- system load -\n");        

                /* get perf reference */

                ref = readl_be( MIXART_MEM( chip->mgr, MIXART_PSEUDOREG_PERF_SYSTEM_LOAD_OFFSET));

                if (ref) {
                        u32 mailbox   = 100 * readl_be( MIXART_MEM( chip->mgr, MIXART_PSEUDOREG_PERF_MAILBX_LOAD_OFFSET)) / ref;
                        u32 streaming = 100 * readl_be( MIXART_MEM( chip->mgr, MIXART_PSEUDOREG_PERF_STREAM_LOAD_OFFSET)) / ref;
                        u32 interr    = 100 * readl_be( MIXART_MEM( chip->mgr, MIXART_PSEUDOREG_PERF_INTERR_LOAD_OFFSET)) / ref;

                        snd_iprintf(buffer, "\tstreaming          : %d\n", streaming);
                        snd_iprintf(buffer, "\tmailbox            : %d\n", mailbox);
                        snd_iprintf(buffer, "\tinterrupts handling : %d\n\n", interr);
                }
        } /* endif elf loaded */
}

static void snd_mixart_proc_init(struct snd_mixart *chip)
{
        struct snd_info_entry *entry;

        /* text interface to read perf and temp meters */
        snd_card_ro_proc_new(chip->card, "board_info", chip,
                             snd_mixart_proc_read);

        if (! snd_card_proc_new(chip->card, "mixart_BA0", &entry)) {
                entry->content = SNDRV_INFO_CONTENT_DATA;
                entry->private_data = chip->mgr;        
                entry->c.ops = &snd_mixart_proc_ops_BA0;
                entry->size = MIXART_BA0_SIZE;
        }
        if (! snd_card_proc_new(chip->card, "mixart_BA1", &entry)) {
                entry->content = SNDRV_INFO_CONTENT_DATA;
                entry->private_data = chip->mgr;
                entry->c.ops = &snd_mixart_proc_ops_BA1;
                entry->size = MIXART_BA1_SIZE;
        }
}
/* end of proc interface */


/*
 *    probe function - creates the card manager
 */
static int snd_mixart_probe(struct pci_dev *pci,
                            const struct pci_device_id *pci_id)
{
        static int dev;
        struct mixart_mgr *mgr;
        unsigned int i;
        int err;
        size_t size;

        /*
         */
        if (dev >= SNDRV_CARDS)
                return -ENODEV;
        if (! enable[dev]) {
                dev++;
                return -ENOENT;
        }

        /* enable PCI device */
        err = pci_enable_device(pci);
        if (err < 0)
                return err;
        pci_set_master(pci);

        /* check if we can restrict PCI DMA transfers to 32 bits */
        if (dma_set_mask(&pci->dev, DMA_BIT_MASK(32)) < 0) {
                dev_err(&pci->dev,
                        "architecture does not support 32bit PCI busmaster DMA\n");
                pci_disable_device(pci);
                return -ENXIO;
        }

        /*
         */
        mgr = kzalloc_obj(*mgr);
        if (! mgr) {
                pci_disable_device(pci);
                return -ENOMEM;
        }

        mgr->pci = pci;
        mgr->irq = -1;

        /* resource assignment */
        err = pci_request_regions(pci, CARD_NAME);
        if (err < 0) {
                kfree(mgr);
                pci_disable_device(pci);
                return err;
        }
        for (i = 0; i < 2; i++) {
                mgr->mem[i].phys = pci_resource_start(pci, i);
                mgr->mem[i].virt = pci_ioremap_bar(pci, i);
                if (!mgr->mem[i].virt) {
                        dev_err(&pci->dev, "unable to remap resource 0x%lx\n",
                               mgr->mem[i].phys);
                        snd_mixart_free(mgr);
                        return -EBUSY;
                }
        }

        if (request_threaded_irq(pci->irq, snd_mixart_interrupt,
                                 snd_mixart_threaded_irq, IRQF_SHARED,
                                 KBUILD_MODNAME, mgr)) {
                dev_err(&pci->dev, "unable to grab IRQ %d\n", pci->irq);
                snd_mixart_free(mgr);
                return -EBUSY;
        }
        mgr->irq = pci->irq;

        /* init mailbox  */
        mgr->msg_fifo_readptr = 0;
        mgr->msg_fifo_writeptr = 0;

        mutex_init(&mgr->lock);
        mutex_init(&mgr->msg_lock);
        init_waitqueue_head(&mgr->msg_sleep);
        atomic_set(&mgr->msg_processed, 0);

        /* init setup mutex*/
        mutex_init(&mgr->setup_mutex);

        /* card assignment */
        mgr->num_cards = MIXART_MAX_CARDS; /* 4  FIXME: configurable? */
        for (i = 0; i < mgr->num_cards; i++) {
                struct snd_card *card;
                char tmpid[16];
                int idx;

                if (index[dev] < 0)
                        idx = index[dev];
                else
                        idx = index[dev] + i;
                snprintf(tmpid, sizeof(tmpid), "%s-%d", id[dev] ? id[dev] : "MIXART", i);
                err = snd_card_new(&pci->dev, idx, tmpid, THIS_MODULE,
                                   0, &card);

                if (err < 0) {
                        dev_err(&pci->dev, "cannot allocate the card %d\n", i);
                        snd_mixart_free(mgr);
                        return err;
                }

                strscpy(card->driver, CARD_NAME);
                snprintf(card->shortname, sizeof(card->shortname),
                         "Digigram miXart [PCM #%d]", i);
                snprintf(card->longname, sizeof(card->longname),
                        "Digigram miXart at 0x%lx & 0x%lx, irq %i [PCM #%d]",
                        mgr->mem[0].phys, mgr->mem[1].phys, mgr->irq, i);

                err = snd_mixart_create(mgr, card, i);
                if (err < 0) {
                        snd_card_free(card);
                        snd_mixart_free(mgr);
                        return err;
                }

                if(i==0) {
                        /* init proc interface only for chip0 */
                        snd_mixart_proc_init(mgr->chip[i]);
                }

                err = snd_card_register(card);
                if (err < 0) {
                        snd_mixart_free(mgr);
                        return err;
                }
        }

        /* init firmware status (mgr->dsp_loaded reset in hwdep_new) */
        mgr->board_type = MIXART_DAUGHTER_TYPE_NONE;

        /* create array of streaminfo */
        size = PAGE_ALIGN( (MIXART_MAX_STREAM_PER_CARD * MIXART_MAX_CARDS *
                            sizeof(struct mixart_flowinfo)) );
        if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, &pci->dev,
                                size, &mgr->flowinfo) < 0) {
                snd_mixart_free(mgr);
                return -ENOMEM;
        }
        /* init streaminfo_array */
        memset(mgr->flowinfo.area, 0, size);

        /* create array of bufferinfo */
        size = PAGE_ALIGN( (MIXART_MAX_STREAM_PER_CARD * MIXART_MAX_CARDS *
                            sizeof(struct mixart_bufferinfo)) );
        if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, &pci->dev,
                                size, &mgr->bufferinfo) < 0) {
                snd_mixart_free(mgr);
                return -ENOMEM;
        }
        /* init bufferinfo_array */
        memset(mgr->bufferinfo.area, 0, size);

        /* set up firmware */
        err = snd_mixart_setup_firmware(mgr);
        if (err < 0) {
                snd_mixart_free(mgr);
                return err;
        }

        pci_set_drvdata(pci, mgr);
        dev++;
        return 0;
}

static void snd_mixart_remove(struct pci_dev *pci)
{
        snd_mixart_free(pci_get_drvdata(pci));
}

static struct pci_driver mixart_driver = {
        .name = KBUILD_MODNAME,
        .id_table = snd_mixart_ids,
        .probe = snd_mixart_probe,
        .remove = snd_mixart_remove,
};

module_pci_driver(mixart_driver);