diff options
Diffstat (limited to 'sound/usb/line6/pcm.c')
| -rw-r--r-- | sound/usb/line6/pcm.c | 527 |
1 files changed, 527 insertions, 0 deletions
diff --git a/sound/usb/line6/pcm.c b/sound/usb/line6/pcm.c new file mode 100644 index 000000000000..6d4e5cd0482c --- /dev/null +++ b/sound/usb/line6/pcm.c @@ -0,0 +1,527 @@ +/* + * Line6 Linux USB driver - 0.9.1beta + * + * 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/control.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> + +#include "audio.h" +#include "capture.h" +#include "driver.h" +#include "playback.h" +#include "pod.h" + +#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE + +static struct snd_line6_pcm *dev2pcm(struct device *dev) +{ + struct usb_interface *interface = to_usb_interface(dev); + struct usb_line6 *line6 = usb_get_intfdata(interface); + struct snd_line6_pcm *line6pcm = line6->line6pcm; + return line6pcm; +} + +/* + "read" request on "impulse_volume" special file. +*/ +static ssize_t impulse_volume_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", dev2pcm(dev)->impulse_volume); +} + +/* + "write" request on "impulse_volume" special file. +*/ +static ssize_t impulse_volume_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct snd_line6_pcm *line6pcm = dev2pcm(dev); + int value; + int ret; + + ret = kstrtoint(buf, 10, &value); + if (ret < 0) + return ret; + + line6pcm->impulse_volume = value; + + if (value > 0) + line6_pcm_acquire(line6pcm, LINE6_BITS_PCM_IMPULSE); + else + line6_pcm_release(line6pcm, LINE6_BITS_PCM_IMPULSE); + + return count; +} +static DEVICE_ATTR_RW(impulse_volume); + +/* + "read" request on "impulse_period" special file. +*/ +static ssize_t impulse_period_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", dev2pcm(dev)->impulse_period); +} + +/* + "write" request on "impulse_period" special file. +*/ +static ssize_t impulse_period_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int value; + int ret; + + ret = kstrtoint(buf, 10, &value); + if (ret < 0) + return ret; + + dev2pcm(dev)->impulse_period = value; + return count; +} +static DEVICE_ATTR_RW(impulse_period); + +#endif + +static bool test_flags(unsigned long flags0, unsigned long flags1, + unsigned long mask) +{ + return ((flags0 & mask) == 0) && ((flags1 & mask) != 0); +} + +int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels) +{ + unsigned long flags_old, flags_new, flags_final; + int err; + + do { + flags_old = ACCESS_ONCE(line6pcm->flags); + flags_new = flags_old | channels; + } while (cmpxchg(&line6pcm->flags, flags_old, flags_new) != flags_old); + + flags_final = flags_old; + + line6pcm->prev_fbuf = NULL; + + if (test_flags(flags_old, flags_new, LINE6_BITS_CAPTURE_BUFFER)) { + /* Invoked multiple times in a row so allocate once only */ + if (!line6pcm->buffer_in) { + line6pcm->buffer_in = + kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS * + line6pcm->max_packet_size, GFP_KERNEL); + if (!line6pcm->buffer_in) { + err = -ENOMEM; + goto pcm_acquire_error; + } + + flags_final |= channels & LINE6_BITS_CAPTURE_BUFFER; + } + } + + if (test_flags(flags_old, flags_new, LINE6_BITS_CAPTURE_STREAM)) { + /* + Waiting for completion of active URBs in the stop handler is + a bug, we therefore report an error if capturing is restarted + too soon. + */ + if (line6pcm->active_urb_in | line6pcm->unlink_urb_in) { + dev_err(line6pcm->line6->ifcdev, "Device not yet ready\n"); + return -EBUSY; + } + + line6pcm->count_in = 0; + line6pcm->prev_fsize = 0; + err = line6_submit_audio_in_all_urbs(line6pcm); + + if (err < 0) + goto pcm_acquire_error; + + flags_final |= channels & LINE6_BITS_CAPTURE_STREAM; + } + + if (test_flags(flags_old, flags_new, LINE6_BITS_PLAYBACK_BUFFER)) { + /* Invoked multiple times in a row so allocate once only */ + if (!line6pcm->buffer_out) { + line6pcm->buffer_out = + kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS * + line6pcm->max_packet_size, GFP_KERNEL); + if (!line6pcm->buffer_out) { + err = -ENOMEM; + goto pcm_acquire_error; + } + + flags_final |= channels & LINE6_BITS_PLAYBACK_BUFFER; + } + } + + if (test_flags(flags_old, flags_new, LINE6_BITS_PLAYBACK_STREAM)) { + /* + See comment above regarding PCM restart. + */ + if (line6pcm->active_urb_out | line6pcm->unlink_urb_out) { + dev_err(line6pcm->line6->ifcdev, "Device not yet ready\n"); + return -EBUSY; + } + + line6pcm->count_out = 0; + err = line6_submit_audio_out_all_urbs(line6pcm); + + if (err < 0) + goto pcm_acquire_error; + + flags_final |= channels & LINE6_BITS_PLAYBACK_STREAM; + } + + return 0; + +pcm_acquire_error: + /* + If not all requested resources/streams could be obtained, release + those which were successfully obtained (if any). + */ + line6_pcm_release(line6pcm, flags_final & channels); + return err; +} + +int line6_pcm_release(struct snd_line6_pcm *line6pcm, int channels) +{ + unsigned long flags_old, flags_new; + + do { + flags_old = ACCESS_ONCE(line6pcm->flags); + flags_new = flags_old & ~channels; + } while (cmpxchg(&line6pcm->flags, flags_old, flags_new) != flags_old); + + if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_STREAM)) + line6_unlink_audio_in_urbs(line6pcm); + + if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_BUFFER)) { + line6_wait_clear_audio_in_urbs(line6pcm); + line6_free_capture_buffer(line6pcm); + } + + if (test_flags(flags_new, flags_old, LINE6_BITS_PLAYBACK_STREAM)) + line6_unlink_audio_out_urbs(line6pcm); + + if (test_flags(flags_new, flags_old, LINE6_BITS_PLAYBACK_BUFFER)) { + line6_wait_clear_audio_out_urbs(line6pcm); + line6_free_playback_buffer(line6pcm); + } + + return 0; +} + +/* trigger callback */ +int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); + struct snd_pcm_substream *s; + int err; + unsigned long flags; + + spin_lock_irqsave(&line6pcm->lock_trigger, flags); + clear_bit(LINE6_INDEX_PREPARED, &line6pcm->flags); + + snd_pcm_group_for_each_entry(s, substream) { + switch (s->stream) { + case SNDRV_PCM_STREAM_PLAYBACK: + err = snd_line6_playback_trigger(line6pcm, cmd); + + if (err < 0) { + spin_unlock_irqrestore(&line6pcm->lock_trigger, + flags); + return err; + } + + break; + + case SNDRV_PCM_STREAM_CAPTURE: + err = snd_line6_capture_trigger(line6pcm, cmd); + + if (err < 0) { + spin_unlock_irqrestore(&line6pcm->lock_trigger, + flags); + return err; + } + + break; + + default: + dev_err(line6pcm->line6->ifcdev, + "Unknown stream direction %d\n", s->stream); + } + } + + spin_unlock_irqrestore(&line6pcm->lock_trigger, flags); + return 0; +} + +/* control info callback */ +static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; + uinfo->count = 2; + uinfo->value.integer.min = 0; + uinfo->value.integer.max = 256; + return 0; +} + +/* control get callback */ +static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + int i; + struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol); + + for (i = 2; i--;) + ucontrol->value.integer.value[i] = line6pcm->volume_playback[i]; + + return 0; +} + +/* control put callback */ +static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + int i, changed = 0; + struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol); + + for (i = 2; i--;) + if (line6pcm->volume_playback[i] != + ucontrol->value.integer.value[i]) { + line6pcm->volume_playback[i] = + ucontrol->value.integer.value[i]; + changed = 1; + } + + return changed; +} + +/* control definition */ +static struct snd_kcontrol_new line6_control_playback = { + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "PCM Playback Volume", + .index = 0, + .access = SNDRV_CTL_ELEM_ACCESS_READWRITE, + .info = snd_line6_control_playback_info, + .get = snd_line6_control_playback_get, + .put = snd_line6_control_playback_put +}; + +/* + Cleanup the PCM device. +*/ +static void line6_cleanup_pcm(struct snd_pcm *pcm) +{ + int i; + struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm); + +#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE + device_remove_file(line6pcm->line6->ifcdev, &dev_attr_impulse_volume); + device_remove_file(line6pcm->line6->ifcdev, &dev_attr_impulse_period); +#endif + + for (i = LINE6_ISO_BUFFERS; i--;) { + if (line6pcm->urb_audio_out[i]) { + usb_kill_urb(line6pcm->urb_audio_out[i]); + usb_free_urb(line6pcm->urb_audio_out[i]); + } + if (line6pcm->urb_audio_in[i]) { + usb_kill_urb(line6pcm->urb_audio_in[i]); + usb_free_urb(line6pcm->urb_audio_in[i]); + } + } +} + +/* create a PCM device */ +static int snd_line6_new_pcm(struct snd_line6_pcm *line6pcm) +{ + struct snd_pcm *pcm; + int err; + + err = snd_pcm_new(line6pcm->line6->card, + (char *)line6pcm->line6->properties->name, + 0, 1, 1, &pcm); + if (err < 0) + return err; + + pcm->private_data = line6pcm; + pcm->private_free = line6_cleanup_pcm; + line6pcm->pcm = pcm; + strcpy(pcm->name, line6pcm->line6->properties->name); + + /* set operators */ + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, + &snd_line6_playback_ops); + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops); + + /* pre-allocation of buffers */ + snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, + snd_dma_continuous_data + (GFP_KERNEL), 64 * 1024, + 128 * 1024); + + return 0; +} + +/* PCM device destructor */ +static int snd_line6_pcm_free(struct snd_device *device) +{ + return 0; +} + +/* + Stop substream if still running. +*/ +static void pcm_disconnect_substream(struct snd_pcm_substream *substream) +{ + if (substream->runtime && snd_pcm_running(substream)) { + snd_pcm_stream_lock_irq(substream); + snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED); + snd_pcm_stream_unlock_irq(substream); + } +} + +/* + Stop PCM stream. +*/ +void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm) +{ + pcm_disconnect_substream(get_substream + (line6pcm, SNDRV_PCM_STREAM_CAPTURE)); + pcm_disconnect_substream(get_substream + (line6pcm, SNDRV_PCM_STREAM_PLAYBACK)); + line6_unlink_wait_clear_audio_out_urbs(line6pcm); + line6_unlink_wait_clear_audio_in_urbs(line6pcm); +} + +/* + Create and register the PCM device and mixer entries. + Create URBs for playback and capture. +*/ +int line6_init_pcm(struct usb_line6 *line6, + struct line6_pcm_properties *properties) +{ + static struct snd_device_ops pcm_ops = { + .dev_free = snd_line6_pcm_free, + }; + + int err; + unsigned ep_read = line6->properties->ep_audio_r; + unsigned ep_write = line6->properties->ep_audio_w; + struct snd_line6_pcm *line6pcm; + + if (!(line6->properties->capabilities & LINE6_CAP_PCM)) + return 0; /* skip PCM initialization and report success */ + + line6pcm = kzalloc(sizeof(*line6pcm), GFP_KERNEL); + + if (line6pcm == NULL) + return -ENOMEM; + + line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255; + line6pcm->volume_monitor = 255; + line6pcm->line6 = line6; + + /* Read and write buffers are sized identically, so choose minimum */ + line6pcm->max_packet_size = min( + usb_maxpacket(line6->usbdev, + usb_rcvisocpipe(line6->usbdev, ep_read), 0), + usb_maxpacket(line6->usbdev, + usb_sndisocpipe(line6->usbdev, ep_write), 1)); + + line6pcm->properties = properties; + line6->line6pcm = line6pcm; + + /* PCM device: */ + err = snd_device_new(line6->card, SNDRV_DEV_PCM, line6, &pcm_ops); + if (err < 0) + return err; + + err = snd_line6_new_pcm(line6pcm); + if (err < 0) + return err; + + spin_lock_init(&line6pcm->lock_audio_out); + spin_lock_init(&line6pcm->lock_audio_in); + spin_lock_init(&line6pcm->lock_trigger); + + err = line6_create_audio_out_urbs(line6pcm); + if (err < 0) + return err; + + err = line6_create_audio_in_urbs(line6pcm); + if (err < 0) + return err; + + /* mixer: */ + err = + snd_ctl_add(line6->card, + snd_ctl_new1(&line6_control_playback, line6pcm)); + if (err < 0) + return err; + +#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE + /* impulse response test: */ + err = device_create_file(line6->ifcdev, &dev_attr_impulse_volume); + if (err < 0) + return err; + + err = device_create_file(line6->ifcdev, &dev_attr_impulse_period); + if (err < 0) + return err; + + line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD; +#endif + + return 0; +} + +/* prepare pcm callback */ +int snd_line6_prepare(struct snd_pcm_substream *substream) +{ + struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); + + switch (substream->stream) { + case SNDRV_PCM_STREAM_PLAYBACK: + if ((line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM) == 0) + line6_unlink_wait_clear_audio_out_urbs(line6pcm); + + break; + + case SNDRV_PCM_STREAM_CAPTURE: + if ((line6pcm->flags & LINE6_BITS_CAPTURE_STREAM) == 0) + line6_unlink_wait_clear_audio_in_urbs(line6pcm); + + break; + + default: + MISSING_CASE; + } + + if (!test_and_set_bit(LINE6_INDEX_PREPARED, &line6pcm->flags)) { + line6pcm->count_out = 0; + line6pcm->pos_out = 0; + line6pcm->pos_out_done = 0; + line6pcm->bytes_out = 0; + line6pcm->count_in = 0; + line6pcm->pos_in_done = 0; + line6pcm->bytes_in = 0; + } + + return 0; +} |