The file contains the code for audio which uses the ALSA.
The audio will register a new card for tlg2300.
Signed-off-by: Huang Shijie <shijie8@xxxxxxxxx>
---
drivers/media/video/tlg2300/pd-alsa.c | 332 +++++++++++++++++++++++++++++++++
1 files changed, 332 insertions(+), 0 deletions(-)
create mode 100644 drivers/media/video/tlg2300/pd-alsa.c
diff --git a/drivers/media/video/tlg2300/pd-alsa.c b/drivers/media/video/tlg2300/pd-alsa.c
new file mode 100644
index 0000000..6f42621
--- /dev/null
+++ b/drivers/media/video/tlg2300/pd-alsa.c
@@ -0,0 +1,332 @@
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/init.h>
+#include <linux/sound.h>
+#include <linux/spinlock.h>
+#include <linux/soundcard.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/info.h>
+#include <sound/initval.h>
+#include <sound/control.h>
+#include <media/v4l2-common.h>
+#include "pd-common.h"
+#include "vendorcmds.h"
+
+static void complete_handler_audio(struct urb *urb);
+#define AUDIO_EP (0x83)
+#define AUDIO_BUF_SIZE (512)
+#define PERIOD_SIZE (1024 * 8)
+#define PERIOD_MIN (4)
+#define PERIOD_MAX PERIOD_MIN
+
+static struct snd_pcm_hardware snd_pd_hw_capture = {
+ .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_MMAP_VALID,
+
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ .rates = SNDRV_PCM_RATE_48000,
+
+ .rate_min = 48000,
+ .rate_max = 48000,
+ .channels_min = 2,
+ .channels_max = 2,
+ .buffer_bytes_max = PERIOD_SIZE * PERIOD_MIN,
+ .period_bytes_min = PERIOD_SIZE,
+ .period_bytes_max = PERIOD_SIZE,
+ .periods_min = PERIOD_MIN,
+ .periods_max = PERIOD_MAX,
+ /*
+ .buffer_bytes_max = 62720 * 8,
+ .period_bytes_min = 64,
+ .period_bytes_max = 12544,
+ .periods_min = 2,
+ .periods_max = 98
+ */
+};
+
+static int snd_pd_capture_open(struct snd_pcm_substream *substream)
+{
+ struct poseidon *p = snd_pcm_substream_chip(substream);
+ struct poseidon_audio *pa = &p->audio;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ if (!p)
+ return -ENODEV;
+ pa->users++;
+ pa->card_close = 0;
+ pa->capture_pcm_substream = substream;
+ runtime->private_data = p;
+
+ runtime->hw = snd_pd_hw_capture;
+ snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+ usb_autopm_get_interface(p->interface);
+ kref_get(&p->kref);
+ return 0;
+}
+
+static int snd_pd_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct poseidon *p = snd_pcm_substream_chip(substream);
+ struct poseidon_audio *pa = &p->audio;
+
+ pa->users--;
+ pa->card_close = 1;
+ usb_autopm_put_interface(p->interface);
+ kref_put(&p->kref, poseidon_delete);
+ return 0;
+}
+
+static int snd_pd_hw_capture_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ unsigned int size;
+
+ size = params_buffer_bytes(hw_params);
+ if (runtime->dma_area) {
+ if (runtime->dma_bytes > size)
+ return 0;
+ vfree(runtime->dma_area);
+ }
+ runtime->dma_area = vmalloc(size);
+ if (!runtime->dma_area)
+ return -ENOMEM;
+ else
+ runtime->dma_bytes = size;
+ return 0;
+}
+
+static int audio_buf_free(struct poseidon *p)
+{
+ struct poseidon_audio *pa = &p->audio;
+ int i;
+
+ for (i = 0; i < AUDIO_BUFS; i++)
+ if (pa->urb_array[i])
+ usb_kill_urb(pa->urb_array[i]);
+ free_all_urb_generic(pa->urb_array, AUDIO_BUFS);
+ logpm();
+ return 0;
+}
+
+static int snd_pd_hw_capture_free(struct snd_pcm_substream *substream)
+{
+ struct poseidon *p = snd_pcm_substream_chip(substream);
+
+ logpm();
+ audio_buf_free(p);
+ return 0;
+}
+
+static int snd_pd_prepare(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+#define AUDIO_TRAILER_SIZE (16)
+static inline void handle_audio_data(struct urb *urb, int *period_elapsed)
+{
+ struct poseidon_audio *pa = urb->context;
+ struct snd_pcm_runtime *runtime = pa->capture_pcm_substream->runtime;
+
+ int stride = runtime->frame_bits >> 3;
+ int len = urb->actual_length / stride;
+ unsigned char *cp = urb->transfer_buffer;
+ unsigned int oldptr = pa->rcv_position;
+
+ if (urb->actual_length == AUDIO_BUF_SIZE - 4)
+ len -= (AUDIO_TRAILER_SIZE / stride);
+
+ /* do the copy */
+ if (oldptr + len >= runtime->buffer_size) {
+ unsigned int cnt = runtime->buffer_size - oldptr;
+
+ memcpy(runtime->dma_area + oldptr * stride, cp, cnt * stride);
+ memcpy(runtime->dma_area, (cp + cnt * stride),
+ (len * stride - cnt * stride));
+ } else
+ memcpy(runtime->dma_area + oldptr * stride, cp, len * stride);
+
+ /* update the statas */
+ snd_pcm_stream_lock(pa->capture_pcm_substream);
+ pa->rcv_position += len;
+ if (pa->rcv_position >= runtime->buffer_size)
+ pa->rcv_position -= runtime->buffer_size;
+
+ pa->copied_position += (len);
+ if (pa->copied_position >= runtime->period_size) {
+ pa->copied_position -= runtime->period_size;
+ *period_elapsed = 1;
+ }
+ snd_pcm_stream_unlock(pa->capture_pcm_substream);
+}
+
+static void complete_handler_audio(struct urb *urb)
+{
+ struct poseidon_audio *pa = urb->context;
+ struct snd_pcm_substream *substream = pa->capture_pcm_substream;
+ int period_elapsed = 0;
+ int ret;
+
+ if (1 == pa->card_close || pa->capture_stream != STREAM_ON)
+ return;
+
+ if (urb->status != 0) {
+ /*if (urb->status == -ESHUTDOWN)*/
+ return;
+ }
+
+ if (substream) {
+ if (urb->actual_length) {
+ handle_audio_data(urb, &period_elapsed);
+ if (period_elapsed)
+ snd_pcm_period_elapsed(substream);
+ }
+ }
+
+ ret = usb_submit_urb(urb, GFP_ATOMIC);
+ if (ret < 0)
+ log("audio urb failed (errcod = %i)", ret);
+ return;
+}
+
+static int fire_audio_urb(struct poseidon *p)
+{
+ int i, ret = 0;
+ struct poseidon_audio *pa = &p->audio;
+
+ alloc_bulk_urbs_generic(pa->urb_array, AUDIO_BUFS,
+ p->udev, AUDIO_EP,
+ AUDIO_BUF_SIZE, GFP_ATOMIC,
+ complete_handler_audio, pa);
+
+ for (i = 0; i < AUDIO_BUFS; i++) {
+ ret = usb_submit_urb(pa->urb_array[i], GFP_KERNEL);
+ if (ret)
+ log("urb err : %d", ret);
+ }
+ log();
+ return ret;
+}
+
+static int snd_pd_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct poseidon *p = snd_pcm_substream_chip(substream);
+ struct poseidon_audio *pa = &p->audio;
+
+ if (debug_mode)
+ log("cmd %d, audio stat : %d\n", cmd, pa->capture_stream);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_START:
+ if (pa->capture_stream == STREAM_ON)
+ return 0;
+
+ pa->rcv_position = pa->copied_position = 0;
+ pa->capture_stream = STREAM_ON;
+
+ if (in_hibernation(p))
+ return 0;
+ fire_audio_urb(p);
+ return 0;
+
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ pa->capture_stream = STREAM_SUSPEND;
+ return 0;
+ case SNDRV_PCM_TRIGGER_STOP:
+ pa->capture_stream = STREAM_OFF;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static snd_pcm_uframes_t
+snd_pd_capture_pointer(struct snd_pcm_substream *substream)
+{
+ struct poseidon *p = snd_pcm_substream_chip(substream);
+ struct poseidon_audio *pa = &p->audio;
+ return pa->rcv_position;
+}
+
+static struct page *snd_pcm_pd_get_page(struct snd_pcm_substream *subs,
+ unsigned long offset)
+{
+ void *pageptr = subs->runtime->dma_area + offset;
+ return vmalloc_to_page(pageptr);
+}
+
+static struct snd_pcm_ops pcm_capture_ops = {
+ .open = snd_pd_capture_open,
+ .close = snd_pd_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = snd_pd_hw_capture_params,
+ .hw_free = snd_pd_hw_capture_free,
+ .prepare = snd_pd_prepare,
+ .trigger = snd_pd_capture_trigger,
+ .pointer = snd_pd_capture_pointer,
+ .page = snd_pcm_pd_get_page,
+};
+
+#ifdef CONFIG_PM
+int pm_alsa_suspend(struct poseidon *p)
+{
+ logpm(p);
+ audio_buf_free(p);
+ return 0;
+}
+
+int pm_alsa_resume(struct poseidon *p)
+{
+ logpm(p);
+ fire_audio_urb(p);
+ return 0;
+}
+#endif
+
+int poseidon_audio_init(struct poseidon *p)
+{
+ struct poseidon_audio *pa = &p->audio;
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+ int ret;
+
+ ret = snd_card_create(-1, "Telegent", THIS_MODULE, 0, &card);
+ if (ret != 0)
+ return ret;
+
+ ret = snd_pcm_new(card, "poseidon audio", 0, 0, 1, &pcm);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
+ pcm->info_flags = 0;
+ pcm->private_data = p;
+ strcpy(pcm->name, "poseidon audio capture");
+
+ strcpy(card->driver, "ALSA driver");
+ strcpy(card->shortname, "poseidon Audio");
+ strcpy(card->longname, "poseidon ALSA Audio");
+
+ if (snd_card_register(card)) {
+ snd_card_free(card);
+ return -ENOMEM;
+ }
+ pa->card = card;
+ return 0;
+}
+
+int poseidon_audio_free(struct poseidon *p)
+{
+ struct poseidon_audio *pa = &p->audio;
+
+ if (pa->card)
+ snd_card_free(pa->card);
+ return 0;
+}
--
1.6.5.2
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