--- /dev/null
+/*
+ * Line6 Linux USB driver - 0.8.0
+ *
+ * Copyright (C) 2004-2009 Markus Grabner (grabner@icg.tugraz.at)
+ *
+ * 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, version 2.
+ *
+ */
+
+#include "driver.h"
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "audio.h"
+#include "pcm.h"
+#include "pod.h"
+#include "playback.h"
+
+
+/*
+ Software stereo volume control.
+*/
+static void change_volume(struct urb *urb_out, int volume[],
+ int bytes_per_frame)
+{
+ int chn = 0;
+
+ if (volume[0] == 256 && volume[1] == 256)
+ return; /* maximum volume - no change */
+
+ if (bytes_per_frame == 4) {
+ short *p, *buf_end;
+ p = (short *)urb_out->transfer_buffer;
+ buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
+
+ for (; p < buf_end; ++p) {
+ *p = (*p * volume[chn & 1]) >> 8;
+ ++chn;
+ }
+ } else if (bytes_per_frame == 6) {
+ unsigned char *p, *buf_end;
+ p = (unsigned char *)urb_out->transfer_buffer;
+ buf_end = p + urb_out->transfer_buffer_length;
+
+ for (; p < buf_end; p += 3) {
+ int val;
+ val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
+ val = (val * volume[chn & 1]) >> 8;
+ p[0] = val;
+ p[1] = val >> 8;
+ p[2] = val >> 16;
+ ++chn;
+ }
+ }
+}
+
+/*
+ Find a free URB, prepare audio data, and submit URB.
+*/
+static int submit_audio_out_urb(struct snd_pcm_substream *substream)
+{
+ int index;
+ unsigned long flags;
+ int i, urb_size, urb_frames;
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+ const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
+ const int frame_increment = line6pcm->properties->snd_line6_rates.rats[0].num_min;
+ const int frame_factor = line6pcm->properties->snd_line6_rates.rats[0].den * (USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct urb *urb_out;
+
+ spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
+ index = find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS);
+
+ if (index < 0 || index >= LINE6_ISO_BUFFERS) {
+ spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
+ dev_err(s2m(substream), "no free URB found\n");
+ return -EINVAL;
+ }
+
+ urb_out = line6pcm->urb_audio_out[index];
+ urb_size = 0;
+
+ for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
+ /* compute frame size for given sampling rate */
+ int n, fs;
+ struct usb_iso_packet_descriptor *fout = &urb_out->iso_frame_desc[i];
+ line6pcm->count_out += frame_increment;
+ n = line6pcm->count_out / frame_factor;
+ line6pcm->count_out -= n * frame_factor;
+ fs = n * bytes_per_frame;
+ fout->offset = urb_size;
+ fout->length = fs;
+ urb_size += fs;
+ }
+
+ urb_frames = urb_size / bytes_per_frame;
+
+ if (test_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags)) {
+ urb_out->transfer_buffer = line6pcm->wrap_out;
+ memset(line6pcm->wrap_out, 0, urb_size);
+ } else {
+ if (line6pcm->pos_out + urb_frames > runtime->buffer_size) {
+ /*
+ The transferred area goes over buffer boundary,
+ copy the data to the temp buffer.
+ */
+ int len;
+ len = runtime->buffer_size - line6pcm->pos_out;
+ urb_out->transfer_buffer = line6pcm->wrap_out;
+
+ if (len > 0) {
+ memcpy(line6pcm->wrap_out, runtime->dma_area + line6pcm->pos_out * bytes_per_frame, len * bytes_per_frame);
+ memcpy(line6pcm->wrap_out + len * bytes_per_frame, runtime->dma_area, (urb_frames - len) * bytes_per_frame);
+ } else
+ dev_err(s2m(substream), "driver bug: len = %d\n", len); /* this is somewhat paranoid */
+ } else {
+ /* set the buffer pointer */
+ urb_out->transfer_buffer = runtime->dma_area + line6pcm->pos_out * bytes_per_frame;
+ }
+ }
+
+ if ((line6pcm->pos_out += urb_frames) >= runtime->buffer_size)
+ line6pcm->pos_out -= runtime->buffer_size;
+
+ urb_out->transfer_buffer_length = urb_size;
+ urb_out->context = substream;
+ change_volume(urb_out, line6pcm->volume, bytes_per_frame);
+
+#if DO_DUMP_PCM_SEND
+ for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
+ struct usb_iso_packet_descriptor *fout = &urb_out->iso_frame_desc[i];
+ line6_write_hexdump(line6pcm->line6, 'P', urb_out->transfer_buffer + fout->offset, fout->length);
+ }
+#endif
+
+ if (usb_submit_urb(urb_out, GFP_ATOMIC) == 0)
+ set_bit(index, &line6pcm->active_urb_out);
+ else
+ dev_err(s2m(substream), "URB out #%d submission failed\n", index);
+
+ spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
+ return 0;
+}
+
+/*
+ Submit all currently available playback URBs.
+*/
+static int submit_audio_out_all_urbs(struct snd_pcm_substream *substream)
+{
+ int ret, i;
+
+ for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
+ ret = submit_audio_out_urb(substream);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ Unlink all currently active playback URBs.
+*/
+static void unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
+{
+ unsigned int i;
+
+ for (i = LINE6_ISO_BUFFERS; i--;) {
+ if (test_bit(i, &line6pcm->active_urb_out)) {
+ if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
+ struct urb *u = line6pcm->urb_audio_out[i];
+ usb_unlink_urb(u);
+ }
+ }
+ }
+}
+
+/*
+ Wait until unlinking of all currently active playback URBs has been finished.
+*/
+static void wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
+{
+ int timeout = HZ;
+ unsigned int i;
+ int alive;
+
+ do {
+ alive = 0;
+ for (i = LINE6_ISO_BUFFERS; i--;) {
+ if (test_bit(i, &line6pcm->active_urb_out))
+ alive++;
+ }
+ if (!alive)
+ break;
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(1);
+ } while (--timeout > 0);
+ if (alive)
+ snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
+
+ line6pcm->active_urb_out = 0;
+ line6pcm->unlink_urb_out = 0;
+}
+
+/*
+ Unlink all currently active playback URBs, and wait for finishing.
+*/
+void unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
+{
+ unlink_audio_out_urbs(line6pcm);
+ wait_clear_audio_out_urbs(line6pcm);
+}
+
+/*
+ Callback for completed playback URB.
+*/
+static void audio_out_callback(struct urb *urb)
+{
+ int i, index, length = 0, shutdown = 0;
+ unsigned long flags;
+
+ struct snd_pcm_substream *substream = (struct snd_pcm_substream *)urb->context;
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ /* find index of URB */
+ for (index = LINE6_ISO_BUFFERS; index--;)
+ if (urb == line6pcm->urb_audio_out[index])
+ break;
+
+ if (index < 0)
+ return; /* URB has been unlinked asynchronously */
+
+ for (i = LINE6_ISO_PACKETS; i--;)
+ length += urb->iso_frame_desc[i].length;
+
+ spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
+ line6pcm->pos_out_done += length / line6pcm->properties->bytes_per_frame;
+
+ if (line6pcm->pos_out_done >= runtime->buffer_size)
+ line6pcm->pos_out_done -= runtime->buffer_size;
+
+ clear_bit(index, &line6pcm->active_urb_out);
+
+ for (i = LINE6_ISO_PACKETS; i--;)
+ if (urb->iso_frame_desc[i].status == -ESHUTDOWN) {
+ shutdown = 1;
+ break;
+ }
+
+ if (test_bit(index, &line6pcm->unlink_urb_out))
+ shutdown = 1;
+
+ spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
+
+ if (!shutdown) {
+ submit_audio_out_urb(substream);
+
+ if ((line6pcm->bytes_out += length) >= line6pcm->period_out) {
+ line6pcm->bytes_out -= line6pcm->period_out;
+ snd_pcm_period_elapsed(substream);
+ }
+ }
+}
+
+/* open playback callback */
+static int snd_line6_playback_open(struct snd_pcm_substream *substream)
+{
+ int err;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+ err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+ (&line6pcm->properties->snd_line6_rates));
+ if (err < 0)
+ return err;
+
+ runtime->hw = line6pcm->properties->snd_line6_playback_hw;
+ return 0;
+}
+
+/* close playback callback */
+static int snd_line6_playback_close(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+/* hw_params playback callback */
+static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params)
+{
+ int ret;
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+ /* -- Florian Demski [FD] */
+ /* don't ask me why, but this fixes the bug on my machine */
+ if (line6pcm == NULL) {
+ if (substream->pcm == NULL)
+ return -ENOMEM;
+ if (substream->pcm->private_data == NULL)
+ return -ENOMEM;
+ substream->private_data = substream->pcm->private_data;
+ line6pcm = snd_pcm_substream_chip(substream);
+ }
+ /* -- [FD] end */
+
+ ret = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(hw_params));
+ if (ret < 0)
+ return ret;
+
+ line6pcm->period_out = params_period_bytes(hw_params);
+ line6pcm->wrap_out = kmalloc(2 * LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
+
+ if (!line6pcm->wrap_out) {
+ dev_err(s2m(substream), "cannot malloc wrap_out\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/* hw_free playback callback */
+static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+ unlink_wait_clear_audio_out_urbs(line6pcm);
+
+ kfree(line6pcm->wrap_out);
+ line6pcm->wrap_out = NULL;
+
+ return snd_pcm_lib_free_pages(substream);
+}
+
+/* trigger playback callback */
+int snd_line6_playback_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+ int err;
+ line6pcm->count_out = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ if (!test_and_set_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags)) {
+ err = submit_audio_out_all_urbs(substream);
+
+ if (err < 0) {
+ clear_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags);
+ return err;
+ }
+ }
+
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ if (test_and_clear_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags))
+ unlink_audio_out_urbs(line6pcm);
+
+ break;
+
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ set_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags);
+ break;
+
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ clear_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* playback pointer callback */
+static snd_pcm_uframes_t
+snd_line6_playback_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+ return line6pcm->pos_out_done;
+}
+
+/* playback operators */
+struct snd_pcm_ops snd_line6_playback_ops = {
+ .open = snd_line6_playback_open,
+ .close = snd_line6_playback_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = snd_line6_playback_hw_params,
+ .hw_free = snd_line6_playback_hw_free,
+ .prepare = snd_line6_prepare,
+ .trigger = snd_line6_trigger,
+ .pointer = snd_line6_playback_pointer,
+};
+
+int create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
+{
+ int i;
+
+ /* create audio URBs and fill in constant values: */
+ for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
+ struct urb *urb;
+
+ /* URB for audio out: */
+ urb = line6pcm->urb_audio_out[i] = usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
+
+ if (urb == NULL) {
+ dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
+ return -ENOMEM;
+ }
+
+ urb->dev = line6pcm->line6->usbdev;
+ urb->pipe = usb_sndisocpipe(line6pcm->line6->usbdev, line6pcm->ep_audio_write & USB_ENDPOINT_NUMBER_MASK);
+ urb->transfer_flags = URB_ISO_ASAP;
+ urb->start_frame = -1;
+ urb->number_of_packets = LINE6_ISO_PACKETS;
+ urb->interval = LINE6_ISO_INTERVAL;
+ urb->error_count = 0;
+ urb->complete = audio_out_callback;
+ }
+
+ return 0;
+}
projects / linux-2.6-omap-h63xx.git / blobdiff