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Date: Thu, 14 Mar 2013 15:07:02 +0100
From: Jon Arne Jørgensen <jonarne@...arne.no>
To: linux-media@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hverkuil@...all.nl,
elezegarcia@...il.com,
Jon Arne Jørgensen <jonarne@...arne.no>
Subject: [RFC V1 6/8] smi2021: Add smi2021_audio.c
This file handles all setup of a new snd_card instance with one pcm_substream.
It's also responsible for parsing the raw pcm data received in the isoc transfers,
and passing it to the alsa buffers.
Signed-off-by: Jon Arne Jørgensen <jonarne@...arne.no>
---
drivers/media/usb/smi2021/smi2021_audio.c | 385 ++++++++++++++++++++++++++++++
1 file changed, 385 insertions(+)
create mode 100644 drivers/media/usb/smi2021/smi2021_audio.c
diff --git a/drivers/media/usb/smi2021/smi2021_audio.c b/drivers/media/usb/smi2021/smi2021_audio.c
new file mode 100644
index 0000000..cd20181
--- /dev/null
+++ b/drivers/media/usb/smi2021/smi2021_audio.c
@@ -0,0 +1,385 @@
+/*******************************************************************************
+ * smi2021_audio.c *
+ * *
+ * USB Driver for SMI2021 - EasyCap *
+ * USB ID 1c88:003c *
+ * *
+ * *****************************************************************************
+ *
+ * Copyright 2011-2013 Jon Arne Jørgensen
+ * <jonjon.arnearne--a.t--gmail.com>
+ *
+ * Copyright 2011, 2012 Tony Brown, Michal Demin, Jeffry Johnston
+ *
+ * This file is part of SMI2021
+ * http://code.google.com/p/easycap-somagic-linux/
+ *
+ * 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/>.
+ *
+ * This driver is heavily influensed by the STK1160 driver.
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ */
+
+#include "smi2021.h"
+
+static void pcm_buffer_free(struct snd_pcm_substream *substream)
+{
+ vfree(substream->runtime->dma_area);
+ substream->runtime->dma_area = NULL;
+ substream->runtime->dma_bytes = 0;
+}
+
+static int pcm_buffer_alloc(struct snd_pcm_substream *substream, int size)
+{
+ if (substream->runtime->dma_area) {
+ if (substream->runtime->dma_bytes > size)
+ return 0;
+ pcm_buffer_free(substream);
+ }
+
+ substream->runtime->dma_area = vmalloc(size);
+ if (substream->runtime->dma_area == NULL)
+ return -ENOMEM;
+
+ substream->runtime->dma_bytes = size;
+
+ return 0;
+}
+
+static const struct snd_pcm_hardware smi2021_pcm_hw = {
+ .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_BATCH,
+
+ .formats = SNDRV_PCM_FMTBIT_S32_LE,
+
+ .rates = SNDRV_PCM_RATE_48000,
+ .rate_min = 48000,
+ .rate_max = 48000,
+ .channels_min = 2,
+ .channels_max = 2,
+ .period_bytes_min = 992, /* 32640 */ /* 15296 */
+ .period_bytes_max = 15872, /* 65280 */
+ .periods_min = 1, /* 1 */
+ .periods_max = 16, /* 2 */
+ .buffer_bytes_max = 65280, /* 65280 */
+};
+
+static int smi2021_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct smi2021_dev *dev = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int rc;
+
+ rc = snd_pcm_hw_constraint_pow2(runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (rc < 0)
+ return rc;
+
+ dev->pcm_substream = substream;
+
+ runtime->hw = smi2021_pcm_hw;
+ snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+
+ smi2021_dbg("PCM device open!\n");
+
+ return 0;
+}
+
+static int smi2021_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct smi2021_dev *dev = snd_pcm_substream_chip(substream);
+ smi2021_dbg("PCM device closing\n");
+
+ if (atomic_read(&dev->adev_capturing)) {
+ atomic_set(&dev->adev_capturing, 0);
+ schedule_work(&dev->adev_capture_trigger);
+ }
+ return 0;
+
+}
+
+
+static int smi2021_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ int size, rc;
+ size = params_period_bytes(hw_params) * params_periods(hw_params);
+
+ rc = pcm_buffer_alloc(substream, size);
+ if (rc < 0)
+ return rc;
+
+
+ return 0;
+}
+
+static int smi2021_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ struct smi2021_dev *dev = snd_pcm_substream_chip(substream);
+
+ if (atomic_read(&dev->adev_capturing)) {
+ atomic_set(&dev->adev_capturing, 0);
+ schedule_work(&dev->adev_capture_trigger);
+ }
+
+ pcm_buffer_free(substream);
+ return 0;
+}
+
+static int smi2021_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ struct smi2021_dev *dev = snd_pcm_substream_chip(substream);
+
+ dev->pcm_complete_samples = 0;
+ dev->pcm_read_offset = 0;
+ dev->pcm_write_ptr = 0;
+
+ return 0;
+}
+
+static void capture_trigger(struct work_struct *work)
+{
+ struct smi2021_dev *dev = container_of(work, struct smi2021_dev,
+ adev_capture_trigger);
+
+ if (atomic_read(&dev->adev_capturing))
+ smi2021_write_reg(dev, 0, 0x1740, 0x1d);
+ else
+ smi2021_write_reg(dev, 0, 0x1740, 0x00);
+}
+
+/* This callback is ATOMIC, must not sleep */
+static int smi2021_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct smi2021_dev *dev = snd_pcm_substream_chip(substream);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_START:
+ atomic_set(&dev->adev_capturing, 1);
+ break;
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_STOP:
+ atomic_set(&dev->adev_capturing, 0);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ schedule_work(&dev->adev_capture_trigger);
+
+ return 0;
+}
+
+static snd_pcm_uframes_t smi2021_pcm_pointer(
+ struct snd_pcm_substream *substream)
+{
+ struct smi2021_dev *dev = snd_pcm_substream_chip(substream);
+ return dev->pcm_write_ptr / 8;
+}
+
+static struct page *smi2021_pcm_get_vmalloc_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 smi2021_pcm_ops = {
+ .open = smi2021_pcm_open,
+ .close = smi2021_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = smi2021_pcm_hw_params,
+ .hw_free = smi2021_pcm_hw_free,
+ .prepare = smi2021_pcm_prepare,
+ .trigger = smi2021_pcm_trigger,
+ .pointer = smi2021_pcm_pointer,
+ .page = smi2021_pcm_get_vmalloc_page,
+};
+
+int smi2021_snd_register(struct smi2021_dev *dev)
+{
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+ int rc = 0;
+
+ rc = snd_card_create(SNDRV_DEFAULT_IDX1, "smi2021 Audio", THIS_MODULE,
+ 0, &card);
+ if (rc < 0)
+ return rc;
+
+ rc = snd_pcm_new(card, "smi2021 Audio", 0, 0, 1, &pcm);
+ if (rc < 0)
+ goto err_free_card;
+
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &smi2021_pcm_ops);
+ pcm->info_flags = 0;
+ pcm->private_data = dev;
+ strcpy(pcm->name, "Somagic smi2021 Capture");
+
+ strcpy(card->driver, "smi2021-Audio");
+ strcpy(card->shortname, "smi2021 Audio");
+ strcpy(card->longname, "Somagic smi2021 Audio");
+
+ INIT_WORK(&dev->adev_capture_trigger, capture_trigger);
+
+ rc = snd_card_register(card);
+ if (rc < 0)
+ goto err_free_card;
+
+ dev->snd_card = card;
+
+ return 0;
+
+err_free_card:
+ snd_card_free(card);
+ return rc;
+}
+
+void smi2021_snd_unregister(struct smi2021_dev *dev)
+{
+ if (!dev)
+ return;
+
+ if (!dev->snd_card)
+ return;
+
+ snd_card_free(dev->snd_card);
+ dev->snd_card = NULL;
+}
+
+void smi2021_audio(struct smi2021_dev *dev, u8 *data, int len)
+{
+ struct snd_pcm_runtime *runtime;
+ u8 offset;
+ int new_offset = 0;
+
+ int skip;
+ unsigned int stride, oldptr, headptr;
+
+ int diff = 0;
+ int samples = 0;
+ bool period_elapsed = false;
+
+
+ if (!dev->udev)
+ return;
+
+ if (atomic_read(&dev->adev_capturing) == 0)
+ return;
+
+ if (!dev->pcm_substream)
+ return;
+
+ runtime = dev->pcm_substream->runtime;
+ if (!runtime || !runtime->dma_area)
+ return;
+
+ offset = dev->pcm_read_offset;
+ stride = runtime->frame_bits >> 3;
+
+ if (stride == 0)
+ return;
+
+ diff = dev->pcm_write_ptr;
+
+ /* Check that the end of the last buffer was correct.
+ * If not correct, we mark any partial frames in buffer as complete
+ */
+ headptr = dev->pcm_write_ptr - offset - 4;
+ if (dev->pcm_write_ptr > 10 && runtime->dma_area[headptr] != 0x00) {
+ skip = stride - (dev->pcm_write_ptr % stride);
+ snd_pcm_stream_lock(dev->pcm_substream);
+ dev->pcm_write_ptr += skip;
+
+ if (dev->pcm_write_ptr >= runtime->dma_bytes)
+ dev->pcm_write_ptr -= runtime->dma_bytes;
+
+ snd_pcm_stream_unlock(dev->pcm_substream);
+ offset = dev->pcm_read_offset = 0;
+ }
+ /* The device is actually sending 24Bit pcm data
+ * with 0x00 as the header byte before each sample.
+ * We look for this byte to make sure we did not
+ * loose any bytes during transfer.
+ */
+ while (len > stride && (data[offset] != 0x00 ||
+ data[offset + (stride / 2)] != 0x00)) {
+ new_offset++;
+ data++;
+ len--;
+ }
+
+ if (len <= stride) {
+ /* We exhausted the buffer looking for 0x00 */
+ dev->pcm_read_offset = 0;
+ return;
+ }
+ if (new_offset != 0) {
+ /* This buffer can not be appended to the current buffer,
+ * so we mark any partial frames in the buffer as complete.
+ */
+ skip = stride - (dev->pcm_write_ptr % stride);
+ snd_pcm_stream_lock(dev->pcm_substream);
+ dev->pcm_write_ptr += skip;
+
+ if (dev->pcm_write_ptr >= runtime->dma_bytes)
+ dev->pcm_write_ptr -= runtime->dma_bytes;
+
+ snd_pcm_stream_unlock(dev->pcm_substream);
+
+ offset = dev->pcm_read_offset = new_offset % (stride / 2);
+
+ }
+
+ oldptr = dev->pcm_write_ptr;
+ if (oldptr + len >= runtime->dma_bytes) {
+ unsigned int cnt = runtime->dma_bytes - oldptr;
+ memcpy(runtime->dma_area + oldptr, data, cnt);
+ memcpy(runtime->dma_area, data + cnt, len - cnt);
+ } else {
+ memcpy(runtime->dma_area + oldptr, data, len);
+ }
+
+ snd_pcm_stream_lock(dev->pcm_substream);
+ dev->pcm_write_ptr += len;
+
+ if (dev->pcm_write_ptr >= runtime->dma_bytes)
+ dev->pcm_write_ptr -= runtime->dma_bytes;
+
+ samples = dev->pcm_write_ptr - diff;
+ if (samples < 0)
+ samples += runtime->dma_bytes;
+
+ samples /= (stride / 2);
+
+ dev->pcm_complete_samples += samples;
+ if (dev->pcm_complete_samples / 2 >= runtime->period_size) {
+ dev->pcm_complete_samples -= runtime->period_size * 2;
+ period_elapsed = true;
+ }
+ snd_pcm_stream_unlock(dev->pcm_substream);
+
+ if (period_elapsed)
+ snd_pcm_period_elapsed(dev->pcm_substream);
+
+}
--
1.8.1.1
--
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