diff options
author | Markus Grabner <grabner@icg.tugraz.at> | 2009-02-27 19:43:04 -0800 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-04-03 14:54:24 -0700 |
commit | 705ececd1c60d0f5d6ef2a719008847883516970 (patch) | |
tree | e2a96ac85e15850919e493181fe47f7fdd471af1 /drivers/staging/line6/capture.c | |
parent | e642f09951f7cbb69983781b07bb9cd881546ac4 (diff) |
Staging: add line6 usb driver
This is an experimental Linux driver for the guitar amp, cab, and
effects modeller PODxt Pro by Line6 (and similar devices), supporting
the following features:
- Reading/writing individual parameters
- Reading/writing complete channel, effects setup, and amp setup data
- Channel switching
- Virtual MIDI interface
- Tuner access
- Playback/capture/mixer device for any ALSA-compatible PCM audio
application
- Signal routing (record clean/processed guitar signal, re-amping)
Moreover, preliminary support for the Variax Workbench is included.
From: Markus Grabner <grabner@icg.tugraz.at>
Cc: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/line6/capture.c')
-rw-r--r-- | drivers/staging/line6/capture.c | 370 |
1 files changed, 370 insertions, 0 deletions
diff --git a/drivers/staging/line6/capture.c b/drivers/staging/line6/capture.c new file mode 100644 index 00000000000..5dec3bfff04 --- /dev/null +++ b/drivers/staging/line6/capture.c @@ -0,0 +1,370 @@ +/* + * 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" + + +/* + Find a free URB and submit it. +*/ +static int submit_audio_in_urb(struct snd_pcm_substream *substream) +{ + 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 < 0 || 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) + if((ret = submit_audio_in_urb(substream)) < 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]; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 14) + u->transfer_flags |= URB_ASYNC_UNLINK; +#endif + 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 PT_REGS) +{ + 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); + + if((err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, + (&line6pcm->properties->snd_line6_rates))) < 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 */ + + if((ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 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); + + if(line6pcm->buffer_in) { + kfree(line6pcm->buffer_in); + line6pcm->buffer_in = 0; + } + + 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; +} |