diff options
Diffstat (limited to 'sound/soc/wmt/wmt-pcm.c')
| -rwxr-xr-x | sound/soc/wmt/wmt-pcm.c | 767 |
1 files changed, 767 insertions, 0 deletions
diff --git a/sound/soc/wmt/wmt-pcm.c b/sound/soc/wmt/wmt-pcm.c new file mode 100755 index 00000000..848ea5a1 --- /dev/null +++ b/sound/soc/wmt/wmt-pcm.c @@ -0,0 +1,767 @@ +/*++ + * linux/sound/soc/wmt/wmt-pcm.c + * WonderMedia audio driver for ALSA + * + * Copyright c 2010 WonderMedia Technologies, Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * WonderMedia Technologies, Inc. + * 4F, 533, Chung-Cheng Road, Hsin-Tien, Taipei 231, R.O.C +--*/ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/platform_device.h> + +#include <linux/dma-mapping.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> +#include <linux/delay.h> + +#include <asm/dma.h> +#include "wmt-pcm.h" +#include "wmt-soc.h" + +#define NULL_DMA ((dmach_t)(-1)) + +#define AUDIO_NAME "WMT_PCM" +//#define WMT_PCM_DEBUG 1 +//#define WMT_PCM_DEBUG_DETAIL 1 + +#ifdef WMT_PCM_DEBUG +#define DPRINTK(format, arg...) \ + printk(KERN_INFO AUDIO_NAME ": " format "\n" , ## arg) +#else +#define DPRINTK(format, arg...) do {} while (0) +#endif + +#ifdef WMT_PCM_DEBUG_DETAIL +#define DBG_DETAIL(format, arg...) \ + printk(KERN_INFO AUDIO_NAME ": [%s]" format "\n" , __FUNCTION__, ## arg) +#else +#define DBG_DETAIL(format, arg...) do {} while (0) +#endif + +#define err(format, arg...) \ + printk(KERN_ERR AUDIO_NAME ": " format "\n" , ## arg) +#define info(format, arg...) \ + printk(KERN_INFO AUDIO_NAME ": " format "\n" , ## arg) +#define warn(format, arg...) \ + printk(KERN_WARNING AUDIO_NAME ": " format "\n" , ## arg) + +static const struct snd_pcm_hardware wmt_pcm_hardware = { + .info = SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_PAUSE | + SNDRV_PCM_INFO_RESUME, + .formats = SNDRV_PCM_FMTBIT_S16_LE, + .rate_min = 8000, + .rate_max = 96000, + .period_bytes_min = 4*1024,//32, + .period_bytes_max = 8*1024,//4 * 1024, + .periods_min = 1,//2, + .periods_max = 16,//128, + .buffer_bytes_max = 64 * 1024, + .fifo_size = 32,// +}; + +struct wmt_runtime_data { + spinlock_t lock; + struct wmt_pcm_dma_data *dma_data; + int dma_ch; + int period_index; +}; + +struct snd_wfd_buffer { + struct device *dev; + unsigned char *area; /* virtual pointer */ + dma_addr_t addr; /* physical address */ + size_t bytes; /* buffer size in bytes */ + size_t valuable_sz; /* valuable size in wfd buffer */ + unsigned char *wr_ptr; + unsigned char *rd_ptr; + int enable; +}; +static struct snd_wfd_buffer wfd_audbuf; + +static int audio_dma_free(struct audio_stream_a *s); + +dmach_t pcm_out_dmach = 0xFF; +struct dma_device_cfg_s *pcm_out_dma_cfg = NULL; + +void wmt_pcm_wfd_start(void) +{ + /* allocate buffer for WFD support */ + wfd_audbuf.area = dma_alloc_writecombine(wfd_audbuf.dev, wfd_audbuf.bytes, + &wfd_audbuf.addr, GFP_KERNEL); + + if (!wfd_audbuf.area) { + err("WFD_Aud allocate buffer fail"); + } + else { + info("*WFD_Aud enable"); + wfd_audbuf.enable = 1; + } + + memset(wfd_audbuf.area, 0x0, wfd_audbuf.bytes); + //info("&wfd_audbuf.addr=0x%x wfd_audbuf.addr=0x%x", &wfd_audbuf.addr, (unsigned int)wfd_audbuf.addr); +} +EXPORT_SYMBOL(wmt_pcm_wfd_start); + +unsigned int wmt_pcm_wfd_get_buf(void) +{ + wfd_audbuf.valuable_sz = 0; + wfd_audbuf.wr_ptr = wfd_audbuf.rd_ptr = wfd_audbuf.area; + return (unsigned int)&wfd_audbuf.addr; +} +EXPORT_SYMBOL(wmt_pcm_wfd_get_buf); + +void wmt_pcm_wfd_stop(void) +{ + wfd_audbuf.wr_ptr = wfd_audbuf.area; + wfd_audbuf.enable = 0; + + dma_free_writecombine(wfd_audbuf.dev, wfd_audbuf.bytes, + wfd_audbuf.area, wfd_audbuf.addr); + info("*WFD_Aud disable"); + return; +} +EXPORT_SYMBOL(wmt_pcm_wfd_stop); + +int wmt_pcm_wfd_get_strm(WFDStrmInfo_t *info) +{ + if ((info->req_sz > wfd_audbuf.bytes) || (!wfd_audbuf.valuable_sz)) { + //info("WFD read size=%d, Too Large!", info->req_sz); + info->avail_sz = 0; + return (int)info; + } + else if (wfd_audbuf.valuable_sz > info->req_sz) { + info->avail_sz = info->req_sz; + wfd_audbuf.valuable_sz -= info->req_sz; + } + else { + info->avail_sz = wfd_audbuf.valuable_sz; + wfd_audbuf.valuable_sz = 0; + } + + info->buf_offset = wfd_audbuf.rd_ptr - wfd_audbuf.area; + wfd_audbuf.rd_ptr += info->avail_sz; + + if (wfd_audbuf.rd_ptr >= wfd_audbuf.area + wfd_audbuf.bytes) + wfd_audbuf.rd_ptr = wfd_audbuf.rd_ptr - wfd_audbuf.bytes; + + return (int)info; +} +EXPORT_SYMBOL(wmt_pcm_wfd_get_strm); + +void wmt_pcm_wfd_update(char *src_buf, unsigned int chunksize) +{ + //info("wmt_pcm_wfd_update, 0x%x", src_buf[1024]); + memcpy(wfd_audbuf.wr_ptr, src_buf, chunksize); + wfd_audbuf.wr_ptr += chunksize; + + if (wfd_audbuf.wr_ptr == wfd_audbuf.area + wfd_audbuf.bytes) + wfd_audbuf.wr_ptr = wfd_audbuf.area; + + wfd_audbuf.valuable_sz += chunksize; + if (wfd_audbuf.valuable_sz >= wfd_audbuf.bytes) { + wfd_audbuf.valuable_sz = wfd_audbuf.bytes; + wfd_audbuf.rd_ptr = wfd_audbuf.wr_ptr; + } +} + +/* + * Main dma routine, requests dma according where you are in main alsa buffer + */ +static void audio_process_dma(struct audio_stream_a *s) +{ + struct snd_pcm_substream *substream = s->stream; + struct snd_pcm_runtime *runtime; + unsigned int dma_size; + unsigned int offset; + dma_addr_t dma_base; + int ret = 0; + + //DBG_DETAIL(); + DPRINTK("s: %d, dmach: %d. active: %d", (int)s, s->dmach, s->active); + + if (s->active) { + substream = s->stream; + runtime = substream->runtime; + dma_size = frames_to_bytes(runtime, runtime->period_size); + /*DPRINTK("frame_bits=%d, period_size=%d, dma_size 1=%d", + runtime->frame_bits, (int)runtime->period_size, dma_size);*/ + if (dma_size > MAX_DMA_SIZE) + dma_size = CUT_DMA_SIZE; + offset = dma_size * s->period; + + /*DPRINTK("offset: 0x%x, ->dma_area: 0x%x, ->dma_addr: 0x%x, final addr: 0x%x", + offset, (unsigned int)runtime->dma_area, runtime->dma_addr, runtime->dma_addr+offset);*/ + + dma_base = __virt_to_phys((dma_addr_t)runtime->dma_area); + + //DPRINTK("dma address: 0x%x", dma_base+offset); + /*DPRINTK("hw_ptr_interrupt: 0x%x, state: %d, hwptr: %u, applptr: %u, avail_min: %u", + (unsigned int)runtime->hw_ptr_interrupt, runtime->status->state, (unsigned int)runtime->status->hw_ptr, + (unsigned int)runtime->control->appl_ptr, (unsigned int)runtime->control->avail_min);*/ + //DPRINTK("dmach: %u, dma_addr: %x, dma_size: %u", s->dmach, dma_base+offset, dma_size); + + if ((runtime->channels == 2 || runtime->channels == 1) && + (runtime->format == SNDRV_PCM_FORMAT_S16_LE)) { + ret = wmt_start_dma(s->dmach, runtime->dma_addr + offset, 0, dma_size); + } + + if (ret) { + printk(KERN_ERR "audio_process_dma: cannot queue DMA buffer (%i) \n", ret); + return; + } + + s->period++; + s->period %= runtime->periods; + s->periods++; + s->offset = offset; + } +} + +/* + * This is called when dma IRQ occurs at the end of each transmited block + */ +static void audio_dma_callback(void *data) +{ + struct audio_stream_a *s = data; + struct snd_pcm_substream *substream; + struct snd_pcm_runtime *runtime; + unsigned int dma_size; + unsigned int offset; + int stream_id; + + //DBG_DETAIL(); + + substream = s->stream; + runtime = substream->runtime; + dma_size = frames_to_bytes(runtime, runtime->period_size); + stream_id = substream->pstr->stream; + + if (s->period > 0) + offset = dma_size * (s->period - 1); + else + offset = dma_size * (s->periods - 1); + + if ((stream_id == SNDRV_PCM_STREAM_PLAYBACK) && (wfd_audbuf.enable)) { + wmt_pcm_wfd_update(runtime->dma_area + offset, dma_size); + } + + /* + * If we are getting a callback for an active stream then we inform + * the PCM middle layer we've finished a period + */ + if (s->active) + snd_pcm_period_elapsed(s->stream); + + spin_lock(&s->dma_lock); + if (s->periods > 0) + s->periods--; + + audio_process_dma(s); + spin_unlock(&s->dma_lock); +} + +static int audio_dma_request(struct audio_stream_a *s, void (*callback) (void *)) +{ + int err; + err = 0; + + DBG_DETAIL(); + + //DPRINTK("s pointer: %d, dmach: %d, id: %s, dma_dev: %d", (int)s, s->dmach, s->id, s->dma_dev); + err = wmt_request_dma(&s->dmach, s->id, s->dma_dev, callback, s); + if (err < 0) + printk(KERN_ERR "Unable to grab audio dma 0x%x\n", s->dmach); + + if (!strcmp(s->id, "WMT I2S out")) { + pcm_out_dmach = s->dmach; + } + return err; +} + +static void audio_setup_dma(struct audio_stream_a *s, int stream_id) +{ + struct snd_pcm_runtime *runtime = s->stream->runtime; + + if (stream_id == SNDRV_PCM_STREAM_PLAYBACK) { + /* From memory to device */ + switch (runtime->channels * runtime->format) { + #if 0 //comment 2014-1-3 tinyplay mono pattern abnormal + case 1: + s->dma_cfg.DefaultCCR = I2S_TX_DMA_8BITS_CFG; /* setup 1 bytes*/ + break ; + case 2: + s->dma_cfg.DefaultCCR = I2S_TX_DMA_16BITS_CFG; /* setup 2 bytes*/ + break ; + case 4: + #endif + default : + s->dma_cfg.DefaultCCR = I2S_TX_DMA_32BITS_CFG; /* setup 4 byte*/ + break ; + } + } + else { + /* From device to memory */ + switch (runtime->channels * runtime->format) { + case 1: + s->dma_cfg.DefaultCCR = I2S_RX_DMA_8BITS_CFG ; /* setup 1 bytes*/ + break ; + case 2: + s->dma_cfg.DefaultCCR = I2S_RX_DMA_16BITS_CFG ; /* setup 2 bytes*/ + break ; + case 4: + s->dma_cfg.DefaultCCR = I2S_RX_DMA_32BITS_CFG ; /* setup 4 byte*/ + break ; + } + } + + s->dma_cfg.ChunkSize = 1; + if (stream_id == SNDRV_PCM_STREAM_PLAYBACK) { + pcm_out_dma_cfg = &s->dma_cfg; + } + + //DPRINTK("s pointer: %d. audio dma %d cfg.DefaultCCR 0x%x ", (int)s, s->dmach, (unsigned int)s->dma_cfg.DefaultCCR); + //DPRINTK("cfg.ChunkSize 0x%x ", s->dma_cfg.ChunkSize); + wmt_setup_dma(s->dmach, s->dma_cfg) ; +} + +static int audio_dma_free(struct audio_stream_a *s) +{ + int err = 0; + DBG_DETAIL(); + wmt_free_dma(s->dmach); + s->dmach = NULL_DMA; + pcm_out_dma_cfg = NULL; + return err; +} + +/* + * this stops the dma and clears the dma ptrs + */ +static void audio_stop_dma(struct audio_stream_a *s) +{ + unsigned long flags; + DBG_DETAIL(); + local_irq_save(flags); + s->active = 0; + s->period = 0; + s->periods = 0; + s->offset = 0; + s->last_offset = 0; + wmt_stop_dma(s->dmach); + wmt_clear_dma(s->dmach); + local_irq_restore(flags); +} + +/* this may get called several times by oss emulation */ +static int wmt_pcm_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + int err = 0; + DBG_DETAIL(); + snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); + runtime->dma_bytes = params_buffer_bytes(params); + return err; +} + +static int wmt_pcm_hw_free(struct snd_pcm_substream *substream) +{ + DBG_DETAIL(); + snd_pcm_set_runtime_buffer(substream, NULL); + return 0; +} + +static int wmt_pcm_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + int stream_id = substream->pstr->stream; + struct audio_stream_a *prtd = runtime->private_data; + struct audio_stream_a *s = &prtd[stream_id]; + + DBG_DETAIL(); + + s->period = 0; + s->periods = 0; + s->offset = 0; + s->last_offset = 0; + audio_setup_dma(s, stream_id); + + return 0; +} + +static int wmt_pcm_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + int stream_id = substream->pstr->stream; + struct audio_stream_a *prtd = runtime->private_data; + struct audio_stream_a *s = &prtd[stream_id]; + int ret = 0; + + DPRINTK("wmt_pcm_trigger Enter, cmd=%d", cmd); + + spin_lock(&s->dma_lock); + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + s->active = 1; + audio_process_dma(s); + break; + + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + s->active = 0; + audio_stop_dma(s); + break; + default: + ret = -EINVAL; + } + spin_unlock(&s->dma_lock); + + return ret; +} + +static snd_pcm_uframes_t wmt_pcm_pointer(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct audio_stream_a *prtd = runtime->private_data; + int stream_id = substream->pstr->stream; + struct audio_stream_a *s = &prtd[stream_id]; + dma_addr_t ptr; + snd_pcm_uframes_t offset = 0; + + ptr = wmt_get_dma_pos(s->dmach); + + if ((runtime->channels == 1 || runtime->channels == 2) && (runtime->format == SNDRV_PCM_FORMAT_S16_LE)) { + offset = bytes_to_frames(runtime, ptr - runtime->dma_addr); + } + + if ((offset < s->last_offset) && ((s->last_offset - offset) < runtime->period_size) && + (s->last_offset != runtime->buffer_size)) { + snd_pcm_uframes_t old_offset = offset; + if (s->last_offset < runtime->period_size) + offset = runtime->period_size; + else { + offset = runtime->period_size * + ((s->last_offset / runtime->period_size) + 1); + } + printk("last_offset %d, old offset %d, new offset %d\n", (int)s->last_offset, (int)old_offset, (int)offset); + } + s->last_offset = offset; + + if (offset >= runtime->buffer_size) + offset = 0; + + spin_lock(&s->dma_lock); + + if (s->periods > 0 && s->periods < 3) { + if (stream_id == SNDRV_PCM_STREAM_PLAYBACK) { + if (snd_pcm_playback_hw_avail(runtime) >= 3 * runtime->period_size) + audio_process_dma(s); + } + else { + if (snd_pcm_capture_hw_avail(runtime) >= 3* runtime->period_size) + audio_process_dma(s); + } + + } + spin_unlock(&s->dma_lock); + + //DPRINTK("offset = %x", (unsigned int)offset); + return offset; +} + +static int wmt_pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_dai *cpu_dai = rtd->cpu_dai; + struct snd_pcm_runtime *runtime = substream->runtime; + struct audio_stream_a *s = runtime->private_data; + int ret; + + DBG_DETAIL(); + + if (!cpu_dai->active) { + audio_dma_request(&s[0], audio_dma_callback); + audio_dma_request(&s[1], audio_dma_callback); + } + + snd_soc_set_runtime_hwparams(substream, &wmt_pcm_hardware); + + /* Ensure that buffer size is a multiple of period size */ + ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); + if (ret < 0) + goto out; + +out: + return ret; +} + +static int wmt_pcm_close(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_dai *cpu_dai = rtd->cpu_dai; + struct snd_pcm_runtime *runtime = substream->runtime; + struct audio_stream_a *s = runtime->private_data; + + DBG_DETAIL(); + + if (!cpu_dai->active) { + audio_dma_free(&s[0]); + audio_dma_free(&s[1]); + } + + return 0; +} + +static int wmt_pcm_mmap(struct snd_pcm_substream *substream, + struct vm_area_struct *vma) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + + DBG_DETAIL(); + + return dma_mmap_writecombine(substream->pcm->card->dev, vma, + runtime->dma_area, + runtime->dma_addr, + runtime->dma_bytes); +} + +static struct snd_pcm_ops wmt_pcm_ops = { + .open = wmt_pcm_open, + .close = wmt_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = wmt_pcm_hw_params, + .hw_free = wmt_pcm_hw_free, + .prepare = wmt_pcm_prepare, + .trigger = wmt_pcm_trigger, + .pointer = wmt_pcm_pointer, + .mmap = wmt_pcm_mmap, +}; + +static u64 wmt_pcm_dmamask = DMA_BIT_MASK(32); + +static int wmt_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, + int stream) +{ + struct snd_pcm_substream *substream = pcm->streams[stream].substream; + struct snd_dma_buffer *buf = &substream->dma_buffer; + size_t size = wmt_pcm_hardware.buffer_bytes_max; + + DBG_DETAIL(); + + buf->dev.type = SNDRV_DMA_TYPE_DEV; + buf->dev.dev = pcm->card->dev; + buf->private_data = NULL; + buf->area = dma_alloc_writecombine(pcm->card->dev, size, + &buf->addr, GFP_KERNEL); + + if (stream == SNDRV_PCM_STREAM_PLAYBACK) { + info("stream = %d, buf_addr = %x", stream, buf->addr); + + wfd_audbuf.bytes = size; + wfd_audbuf.dev = pcm->card->dev; + wfd_audbuf.enable = 0; + } + + if (!buf->area) + return -ENOMEM; + + buf->bytes = size; + + return 0; +} + +static void wmt_pcm_free_dma_buffers(struct snd_pcm *pcm) +{ + struct snd_pcm_substream *substream; + struct snd_dma_buffer *buf; + int stream; + + DBG_DETAIL(); + + for (stream = 0; stream < 2; stream++) { + substream = pcm->streams[stream].substream; + if (!substream) + continue; + + buf = &substream->dma_buffer; + if (!buf->area) + continue; + + dma_free_writecombine(pcm->card->dev, buf->bytes, buf->area, buf->addr); + + buf->area = NULL; + } +} + +int wmt_pcm_new(struct snd_soc_pcm_runtime *rtd) +{ + struct snd_card *card = rtd->card->snd_card; + struct snd_pcm *pcm = rtd->pcm; + int ret = 0; + + DBG_DETAIL(); + + if (!card->dev->dma_mask) + card->dev->dma_mask = &wmt_pcm_dmamask; + if (!card->dev->coherent_dma_mask) + card->dev->coherent_dma_mask = DMA_BIT_MASK(32); + + if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { + ret = wmt_pcm_preallocate_dma_buffer(pcm, + SNDRV_PCM_STREAM_PLAYBACK); + if (ret) + goto out; + } + + if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { + ret = wmt_pcm_preallocate_dma_buffer(pcm, + SNDRV_PCM_STREAM_CAPTURE); + if (ret) + goto out; + } + +out: + /* free preallocated buffers in case of error */ + if (ret) + wmt_pcm_free_dma_buffers(pcm); + + return ret; +} + +#ifdef CONFIG_PM +static int wmt_pcm_suspend(struct snd_soc_dai *dai) +{ + struct snd_pcm_runtime *runtime = dai->runtime; + struct audio_stream_a *prtd; + struct audio_stream_a *s; + + DBG_DETAIL(); + + if (!runtime) + return 0; + + prtd = runtime->private_data; + s = &prtd[SNDRV_PCM_STREAM_PLAYBACK]; + + if (s->active) { + udelay(5); + wmt_stop_dma(s->dmach); + /* + wmt_clear_dma(s->dmach); + audio_stop_dma(s); + */ + } + + s = &prtd[SNDRV_PCM_STREAM_CAPTURE]; + + if (s->active) { + udelay(5); + wmt_stop_dma(s->dmach); + /* + wmt_clear_dma(s->dmach); + audio_stop_dma(s); + */ + } + + return 0; +} + +static int wmt_pcm_resume(struct snd_soc_dai *dai) +{ + struct snd_pcm_runtime *runtime = dai->runtime; + struct audio_stream_a *prtd; + struct audio_stream_a *s; + + DBG_DETAIL(); + + if (!runtime) { + if ((pcm_out_dmach != 0xFF) && (pcm_out_dma_cfg != NULL)) { + wmt_setup_dma(pcm_out_dmach, *pcm_out_dma_cfg); + } + return 0; + } + + prtd = runtime->private_data; + s = &prtd[SNDRV_PCM_STREAM_PLAYBACK]; + audio_setup_dma(s, SNDRV_PCM_STREAM_PLAYBACK); + + if (s->active) { + wmt_resume_dma(s->dmach) ; + } + + s = &prtd[SNDRV_PCM_STREAM_CAPTURE]; + audio_setup_dma(s, SNDRV_PCM_STREAM_CAPTURE); + + if (s->active) { + wmt_resume_dma(s->dmach) ; + } + + return 0; +} +#else +#define wmt_pcm_suspend NULL +#define wmt_pcm_resume NULL +#endif + +static struct snd_soc_platform_driver wmt_soc_platform = { + .ops = &wmt_pcm_ops, + .pcm_new = wmt_pcm_new, + .pcm_free = wmt_pcm_free_dma_buffers, + .suspend = wmt_pcm_suspend, + .resume = wmt_pcm_resume, +}; + +static int __devinit wmt_pcm_platform_probe(struct platform_device *pdev) +{ + DBG_DETAIL(); + + return snd_soc_register_platform(&pdev->dev, &wmt_soc_platform); +} + +static int __devexit wmt_pcm_platform_remove(struct platform_device *pdev) +{ + DBG_DETAIL(); + + snd_soc_unregister_platform(&pdev->dev); + return 0; +} + +static struct platform_driver wmt_pcm_driver = { + .driver = { + .name = "wmt-audio-pcm", + .owner = THIS_MODULE, + }, + + .probe = wmt_pcm_platform_probe, + .remove = __devexit_p(wmt_pcm_platform_remove), +}; + +module_platform_driver(wmt_pcm_driver); + +MODULE_AUTHOR("WonderMedia Technologies, Inc."); +MODULE_DESCRIPTION("WMT [ALSA SoC/pcm] driver"); +MODULE_LICENSE("GPL"); |