diff options
Diffstat (limited to 'kernel/sound/usb/line6/capture.c')
| -rw-r--r-- | kernel/sound/usb/line6/capture.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/kernel/sound/usb/line6/capture.c b/kernel/sound/usb/line6/capture.c new file mode 100644 index 000000000..f518fbbe8 --- /dev/null +++ b/kernel/sound/usb/line6/capture.c @@ -0,0 +1,275 @@ +/* + * Line 6 Linux USB driver + * + * Copyright (C) 2004-2010 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 <linux/slab.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> + +#include "capture.h" +#include "driver.h" +#include "pcm.h" + +/* + Find a free URB and submit it. + must be called in line6pcm->in.lock context +*/ +static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm) +{ + int index; + int i, urb_size; + int ret; + struct urb *urb_in; + + index = + find_first_zero_bit(&line6pcm->in.active_urbs, LINE6_ISO_BUFFERS); + + if (index < 0 || index >= LINE6_ISO_BUFFERS) { + dev_err(line6pcm->line6->ifcdev, "no free URB found\n"); + return -EINVAL; + } + + urb_in = line6pcm->in.urbs[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->in.buffer + + index * LINE6_ISO_PACKETS * line6pcm->max_packet_size; + urb_in->transfer_buffer_length = urb_size; + urb_in->context = line6pcm; + + ret = usb_submit_urb(urb_in, GFP_ATOMIC); + + if (ret == 0) + set_bit(index, &line6pcm->in.active_urbs); + else + dev_err(line6pcm->line6->ifcdev, + "URB in #%d submission failed (%d)\n", index, ret); + + return 0; +} + +/* + Submit all currently available capture URBs. + must be called in line6pcm->in.lock context +*/ +int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm) +{ + int ret = 0, i; + + for (i = 0; i < LINE6_ISO_BUFFERS; ++i) { + ret = submit_audio_in_urb(line6pcm); + if (ret < 0) + break; + } + + return ret; +} + +/* + Copy data into ALSA capture buffer. +*/ +void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize) +{ + struct snd_pcm_substream *substream = + get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE); + struct snd_pcm_runtime *runtime = substream->runtime; + const int bytes_per_frame = line6pcm->properties->bytes_per_frame; + int frames = fsize / bytes_per_frame; + + if (runtime == NULL) + return; + + if (line6pcm->in.pos_done + frames > runtime->buffer_size) { + /* + The transferred area goes over buffer boundary, + copy two separate chunks. + */ + int len; + + len = runtime->buffer_size - line6pcm->in.pos_done; + + if (len > 0) { + memcpy(runtime->dma_area + + line6pcm->in.pos_done * bytes_per_frame, fbuf, + len * bytes_per_frame); + memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, + (frames - len) * bytes_per_frame); + } else { + /* this is somewhat paranoid */ + dev_err(line6pcm->line6->ifcdev, + "driver bug: len = %d\n", len); + } + } else { + /* copy single chunk */ + memcpy(runtime->dma_area + + line6pcm->in.pos_done * bytes_per_frame, fbuf, fsize); + } + + line6pcm->in.pos_done += frames; + if (line6pcm->in.pos_done >= runtime->buffer_size) + line6pcm->in.pos_done -= runtime->buffer_size; +} + +void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length) +{ + struct snd_pcm_substream *substream = + get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE); + + line6pcm->in.bytes += length; + if (line6pcm->in.bytes >= line6pcm->in.period) { + line6pcm->in.bytes %= line6pcm->in.period; + spin_unlock(&line6pcm->in.lock); + snd_pcm_period_elapsed(substream); + spin_lock(&line6pcm->in.lock); + } +} + +/* + * Callback for completed capture URB. + */ +static void audio_in_callback(struct urb *urb) +{ + int i, index, length = 0, shutdown = 0; + unsigned long flags; + + struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context; + + line6pcm->in.last_frame = urb->start_frame; + + /* find index of URB */ + for (index = 0; index < LINE6_ISO_BUFFERS; ++index) + if (urb == line6pcm->in.urbs[index]) + break; + + spin_lock_irqsave(&line6pcm->in.lock, 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 == -EXDEV) { + shutdown = 1; + break; + } + + fbuf = urb->transfer_buffer + fin->offset; + fsize = fin->actual_length; + + if (fsize > line6pcm->max_packet_size) { + dev_err(line6pcm->line6->ifcdev, + "driver and/or device bug: packet too large (%d > %d)\n", + fsize, line6pcm->max_packet_size); + } + + length += fsize; + + /* the following assumes LINE6_ISO_PACKETS == 1: */ + line6pcm->prev_fbuf = fbuf; + line6pcm->prev_fsize = fsize; + + if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) && + test_bit(LINE6_STREAM_PCM, &line6pcm->in.running) && + fsize > 0) + line6_capture_copy(line6pcm, fbuf, fsize); + } + + clear_bit(index, &line6pcm->in.active_urbs); + + if (test_and_clear_bit(index, &line6pcm->in.unlink_urbs)) + shutdown = 1; + + if (!shutdown) { + submit_audio_in_urb(line6pcm); + + if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) && + test_bit(LINE6_STREAM_PCM, &line6pcm->in.running)) + line6_capture_check_period(line6pcm, length); + } + + spin_unlock_irqrestore(&line6pcm->in.lock, flags); +} + +/* 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->rates); + if (err < 0) + return err; + + runtime->hw = line6pcm->properties->capture_hw; + return 0; +} + +/* close capture callback */ +static int snd_line6_capture_close(struct snd_pcm_substream *substream) +{ + return 0; +} + +/* 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_hw_params, + .hw_free = snd_line6_hw_free, + .prepare = snd_line6_prepare, + .trigger = snd_line6_trigger, + .pointer = snd_line6_pointer, +}; + +int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm) +{ + struct usb_line6 *line6 = line6pcm->line6; + 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->in.urbs[i] = + usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL); + + if (urb == NULL) + return -ENOMEM; + + urb->dev = line6->usbdev; + urb->pipe = + usb_rcvisocpipe(line6->usbdev, + line6->properties->ep_audio_r & + 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; +} |