/drivers/staging/line6/capture.c
C | 372 lines | 258 code | 67 blank | 47 comment | 45 complexity | 4f7a1019c2659e2f6d409ec43a371024 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
- /*
- * 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 "capture.h"
- /*
- Find a free URB and submit it.
- */
- static int submit_audio_in_urb(struct snd_pcm_substream *substream)
- {
- unsigned int index;
- unsigned long flags;
- struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
- int i, urb_size;
- struct urb *urb_in;
- spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
- index = find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);
- if (index >= LINE6_ISO_BUFFERS) {
- spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
- dev_err(s2m(substream), "no free URB found\n");
- return -EINVAL;
- }
- urb_in = line6pcm->urb_audio_in[index];
- urb_size = 0;
- for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
- struct usb_iso_packet_descriptor *fin = &urb_in->iso_frame_desc[i];
- fin->offset = urb_size;
- fin->length = line6pcm->max_packet_size;
- urb_size += line6pcm->max_packet_size;
- }
- urb_in->transfer_buffer = line6pcm->buffer_in + index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
- urb_in->transfer_buffer_length = urb_size;
- urb_in->context = substream;
- if (usb_submit_urb(urb_in, GFP_ATOMIC) == 0)
- set_bit(index, &line6pcm->active_urb_in);
- else
- dev_err(s2m(substream), "URB in #%d submission failed\n", index);
- spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
- return 0;
- }
- /*
- Submit all currently available capture URBs.
- */
- static int submit_audio_in_all_urbs(struct snd_pcm_substream *substream)
- {
- int ret, i;
- for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
- ret = submit_audio_in_urb(substream);
- if (ret < 0)
- return ret;
- }
- return 0;
- }
- /*
- Unlink all currently active capture URBs.
- */
- static void unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
- {
- unsigned int i;
- for (i = LINE6_ISO_BUFFERS; i--;) {
- if (test_bit(i, &line6pcm->active_urb_in)) {
- if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
- struct urb *u = line6pcm->urb_audio_in[i];
- usb_unlink_urb(u);
- }
- }
- }
- }
- /*
- Wait until unlinking of all currently active capture URBs has been
- finished.
- */
- static void wait_clear_audio_in_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_in))
- 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_in = 0;
- line6pcm->unlink_urb_in = 0;
- }
- /*
- Unlink all currently active capture URBs, and wait for finishing.
- */
- void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
- {
- unlink_audio_in_urbs(line6pcm);
- wait_clear_audio_in_urbs(line6pcm);
- }
- /*
- Callback for completed capture URB.
- */
- static void audio_in_callback(struct urb *urb)
- {
- int i, index, length = 0, shutdown = 0;
- int frames;
- unsigned long flags;
- struct snd_pcm_substream *substream = (struct snd_pcm_substream *)urb->context;
- struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
- const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
- struct snd_pcm_runtime *runtime = substream->runtime;
- /* find index of URB */
- for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
- if (urb == line6pcm->urb_audio_in[index])
- break;
- #if DO_DUMP_PCM_RECEIVE
- for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
- struct usb_iso_packet_descriptor *fout = &urb->iso_frame_desc[i];
- line6_write_hexdump(line6pcm->line6, 'C', urb->transfer_buffer + fout->offset, fout->length);
- }
- #endif
- spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
- for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
- char *fbuf;
- int fsize;
- struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
- if (fin->status == -18) {
- shutdown = 1;
- break;
- }
- fbuf = urb->transfer_buffer + fin->offset;
- fsize = fin->actual_length;
- length += fsize;
- if (fsize > 0) {
- frames = fsize / bytes_per_frame;
- if (line6pcm->pos_in_done + frames > runtime->buffer_size) {
- /*
- The transferred area goes over buffer boundary,
- copy two separate chunks.
- */
- int len;
- len = runtime->buffer_size - line6pcm->pos_in_done;
- if (len > 0) {
- memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, len * bytes_per_frame);
- memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, (frames - len) * bytes_per_frame);
- } else
- dev_err(s2m(substream), "driver bug: len = %d\n", len); /* this is somewhat paranoid */
- } else {
- /* copy single chunk */
- memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize * bytes_per_frame);
- }
- if ((line6pcm->pos_in_done += frames) >= runtime->buffer_size)
- line6pcm->pos_in_done -= runtime->buffer_size;
- }
- }
- clear_bit(index, &line6pcm->active_urb_in);
- if (test_bit(index, &line6pcm->unlink_urb_in))
- shutdown = 1;
- spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
- if (!shutdown) {
- submit_audio_in_urb(substream);
- if ((line6pcm->bytes_in += length) >= line6pcm->period_in) {
- line6pcm->bytes_in -= line6pcm->period_in;
- snd_pcm_period_elapsed(substream);
- }
- }
- }
- /* open capture callback */
- static int snd_line6_capture_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_capture_hw;
- return 0;
- }
- /* close capture callback */
- static int snd_line6_capture_close(struct snd_pcm_substream *substream)
- {
- return 0;
- }
- /* hw_params capture callback */
- static int snd_line6_capture_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_in = params_period_bytes(hw_params);
- line6pcm->buffer_in = kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS * LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
- if (!line6pcm->buffer_in) {
- dev_err(s2m(substream), "cannot malloc buffer_in\n");
- return -ENOMEM;
- }
- return 0;
- }
- /* hw_free capture callback */
- static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
- {
- struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
- unlink_wait_clear_audio_in_urbs(line6pcm);
- kfree(line6pcm->buffer_in);
- line6pcm->buffer_in = NULL;
- return snd_pcm_lib_free_pages(substream);
- }
- /* trigger callback */
- int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd)
- {
- struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
- int err;
- line6pcm->count_in = 0;
- switch (cmd) {
- case SNDRV_PCM_TRIGGER_START:
- if (!test_and_set_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags)) {
- err = submit_audio_in_all_urbs(substream);
- if (err < 0) {
- clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags);
- return err;
- }
- }
- break;
- case SNDRV_PCM_TRIGGER_STOP:
- if (test_and_clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags))
- unlink_audio_in_urbs(line6pcm);
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- /* capture pointer callback */
- static snd_pcm_uframes_t
- snd_line6_capture_pointer(struct snd_pcm_substream *substream)
- {
- struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
- return line6pcm->pos_in_done;
- }
- /* capture operators */
- struct snd_pcm_ops snd_line6_capture_ops = {
- .open = snd_line6_capture_open,
- .close = snd_line6_capture_close,
- .ioctl = snd_pcm_lib_ioctl,
- .hw_params = snd_line6_capture_hw_params,
- .hw_free = snd_line6_capture_hw_free,
- .prepare = snd_line6_prepare,
- .trigger = snd_line6_trigger,
- .pointer = snd_line6_capture_pointer,
- };
- int create_audio_in_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 in: */
- urb = line6pcm->urb_audio_in[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_rcvisocpipe(line6pcm->line6->usbdev, line6pcm->ep_audio_read & 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_in_callback;
- }
- return 0;
- }