diff options
Diffstat (limited to 'drivers/staging/line6/pcm.h')
| -rw-r--r-- | drivers/staging/line6/pcm.h | 167 |
1 files changed, 116 insertions, 51 deletions
diff --git a/drivers/staging/line6/pcm.h b/drivers/staging/line6/pcm.h index 55d8297dd3d9..5210ec8dbe16 100644 --- a/drivers/staging/line6/pcm.h +++ b/drivers/staging/line6/pcm.h @@ -46,57 +46,131 @@ (line6pcm->pcm->streams[stream].substream) /* - PCM mode bits and masks. - "ALSA": operations triggered by applications via ALSA - "MONITOR": software monitoring - "IMPULSE": optional impulse response operation + PCM mode bits. + + There are several features of the Line6 USB driver which require PCM + data to be exchanged with the device: + *) PCM playback and capture via ALSA + *) software monitoring (for devices without hardware monitoring) + *) optional impulse response measurement + However, from the device's point of view, there is just a single + capture and playback stream, which must be shared between these + subsystems. It is therefore necessary to maintain the state of the + subsystems with respect to PCM usage. We define several constants of + the form LINE6_BIT_PCM_<subsystem>_<direction>_<resource> with the + following meanings: + *) <subsystem> is one of + -) ALSA: PCM playback and capture via ALSA + -) MONITOR: software monitoring + -) IMPULSE: optional impulse response measurement + *) <direction> is one of + -) PLAYBACK: audio output (from host to device) + -) CAPTURE: audio input (from device to host) + *) <resource> is one of + -) BUFFER: buffer required by PCM data stream + -) STREAM: actual PCM data stream + + The subsystems call line6_pcm_acquire() to acquire the (shared) + resources needed for a particular operation (e.g., allocate the buffer + for ALSA playback or start the capture stream for software monitoring). + When a resource is no longer needed, it is released by calling + line6_pcm_release(). Buffer allocation and stream startup are handled + separately to allow the ALSA kernel driver to perform them at + appropriate places (since the callback which starts a PCM stream is not + allowed to sleep). */ enum { - /* individual bits: */ - BIT_PCM_ALSA_PLAYBACK, - BIT_PCM_ALSA_CAPTURE, - BIT_PCM_MONITOR_PLAYBACK, - BIT_PCM_MONITOR_CAPTURE, + /* individual bit indices: */ + LINE6_INDEX_PCM_ALSA_PLAYBACK_BUFFER, + LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, + LINE6_INDEX_PCM_ALSA_CAPTURE_BUFFER, + LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM, + LINE6_INDEX_PCM_MONITOR_PLAYBACK_BUFFER, + LINE6_INDEX_PCM_MONITOR_PLAYBACK_STREAM, + LINE6_INDEX_PCM_MONITOR_CAPTURE_BUFFER, + LINE6_INDEX_PCM_MONITOR_CAPTURE_STREAM, #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE - BIT_PCM_IMPULSE_PLAYBACK, - BIT_PCM_IMPULSE_CAPTURE, + LINE6_INDEX_PCM_IMPULSE_PLAYBACK_BUFFER, + LINE6_INDEX_PCM_IMPULSE_PLAYBACK_STREAM, + LINE6_INDEX_PCM_IMPULSE_CAPTURE_BUFFER, + LINE6_INDEX_PCM_IMPULSE_CAPTURE_STREAM, #endif - BIT_PAUSE_PLAYBACK, - BIT_PREPARED, - - /* individual masks: */ -/* *INDENT-OFF* */ - MASK_PCM_ALSA_PLAYBACK = 1 << BIT_PCM_ALSA_PLAYBACK, - MASK_PCM_ALSA_CAPTURE = 1 << BIT_PCM_ALSA_CAPTURE, - MASK_PCM_MONITOR_PLAYBACK = 1 << BIT_PCM_MONITOR_PLAYBACK, - MASK_PCM_MONITOR_CAPTURE = 1 << BIT_PCM_MONITOR_CAPTURE, + LINE6_INDEX_PAUSE_PLAYBACK, + LINE6_INDEX_PREPARED, + + /* individual bit masks: */ + LINE6_BIT(PCM_ALSA_PLAYBACK_BUFFER), + LINE6_BIT(PCM_ALSA_PLAYBACK_STREAM), + LINE6_BIT(PCM_ALSA_CAPTURE_BUFFER), + LINE6_BIT(PCM_ALSA_CAPTURE_STREAM), + LINE6_BIT(PCM_MONITOR_PLAYBACK_BUFFER), + LINE6_BIT(PCM_MONITOR_PLAYBACK_STREAM), + LINE6_BIT(PCM_MONITOR_CAPTURE_BUFFER), + LINE6_BIT(PCM_MONITOR_CAPTURE_STREAM), #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE - MASK_PCM_IMPULSE_PLAYBACK = 1 << BIT_PCM_IMPULSE_PLAYBACK, - MASK_PCM_IMPULSE_CAPTURE = 1 << BIT_PCM_IMPULSE_CAPTURE, + LINE6_BIT(PCM_IMPULSE_PLAYBACK_BUFFER), + LINE6_BIT(PCM_IMPULSE_PLAYBACK_STREAM), + LINE6_BIT(PCM_IMPULSE_CAPTURE_BUFFER), + LINE6_BIT(PCM_IMPULSE_CAPTURE_STREAM), #endif - MASK_PAUSE_PLAYBACK = 1 << BIT_PAUSE_PLAYBACK, - MASK_PREPARED = 1 << BIT_PREPARED, -/* *INDENT-ON* */ + LINE6_BIT(PAUSE_PLAYBACK), + LINE6_BIT(PREPARED), - /* combined masks (by operation): */ - MASK_PCM_ALSA = MASK_PCM_ALSA_PLAYBACK | MASK_PCM_ALSA_CAPTURE, - MASK_PCM_MONITOR = MASK_PCM_MONITOR_PLAYBACK | MASK_PCM_MONITOR_CAPTURE, + /* combined bit masks (by operation): */ + LINE6_BITS_PCM_ALSA_BUFFER = + LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER | + LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER, + + LINE6_BITS_PCM_ALSA_STREAM = + LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM | + LINE6_BIT_PCM_ALSA_CAPTURE_STREAM, + + LINE6_BITS_PCM_MONITOR = + LINE6_BIT_PCM_MONITOR_PLAYBACK_BUFFER | + LINE6_BIT_PCM_MONITOR_PLAYBACK_STREAM | + LINE6_BIT_PCM_MONITOR_CAPTURE_BUFFER | + LINE6_BIT_PCM_MONITOR_CAPTURE_STREAM, + +#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE + LINE6_BITS_PCM_IMPULSE = + LINE6_BIT_PCM_IMPULSE_PLAYBACK_BUFFER | + LINE6_BIT_PCM_IMPULSE_PLAYBACK_STREAM | + LINE6_BIT_PCM_IMPULSE_CAPTURE_BUFFER | + LINE6_BIT_PCM_IMPULSE_CAPTURE_STREAM, +#endif + + /* combined bit masks (by direction): */ + LINE6_BITS_PLAYBACK_BUFFER = +#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE + LINE6_BIT_PCM_IMPULSE_PLAYBACK_BUFFER | +#endif + LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER | + LINE6_BIT_PCM_MONITOR_PLAYBACK_BUFFER , + + LINE6_BITS_PLAYBACK_STREAM = +#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE + LINE6_BIT_PCM_IMPULSE_PLAYBACK_STREAM | +#endif + LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM | + LINE6_BIT_PCM_MONITOR_PLAYBACK_STREAM , + + LINE6_BITS_CAPTURE_BUFFER = #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE - MASK_PCM_IMPULSE = MASK_PCM_IMPULSE_PLAYBACK | MASK_PCM_IMPULSE_CAPTURE, + LINE6_BIT_PCM_IMPULSE_CAPTURE_BUFFER | #endif + LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER | + LINE6_BIT_PCM_MONITOR_CAPTURE_BUFFER , - /* combined masks (by direction): */ + LINE6_BITS_CAPTURE_STREAM = #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE - MASK_PLAYBACK = - MASK_PCM_ALSA_PLAYBACK | MASK_PCM_MONITOR_PLAYBACK | - MASK_PCM_IMPULSE_PLAYBACK, - MASK_CAPTURE = - MASK_PCM_ALSA_CAPTURE | MASK_PCM_MONITOR_CAPTURE | - MASK_PCM_IMPULSE_CAPTURE -#else - MASK_PLAYBACK = MASK_PCM_ALSA_PLAYBACK | MASK_PCM_MONITOR_PLAYBACK, - MASK_CAPTURE = MASK_PCM_ALSA_CAPTURE | MASK_PCM_MONITOR_CAPTURE + LINE6_BIT_PCM_IMPULSE_CAPTURE_STREAM | #endif + LINE6_BIT_PCM_ALSA_CAPTURE_STREAM | + LINE6_BIT_PCM_MONITOR_CAPTURE_STREAM, + + LINE6_BITS_STREAM = + LINE6_BITS_PLAYBACK_STREAM | + LINE6_BITS_CAPTURE_STREAM }; struct line6_pcm_properties { @@ -290,7 +364,7 @@ struct snd_line6_pcm { #endif /** - Several status bits (see BIT_*). + Several status bits (see LINE6_BIT_*). */ unsigned long flags; @@ -302,16 +376,7 @@ extern int line6_init_pcm(struct usb_line6 *line6, extern int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd); extern int snd_line6_prepare(struct snd_pcm_substream *substream); extern void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm); -extern int line6_pcm_start(struct snd_line6_pcm *line6pcm, int channels); -extern int line6_pcm_stop(struct snd_line6_pcm *line6pcm, int channels); - -#define PRINT_FRAME_DIFF(op) { \ - static int diff_prev = 1000; \ - int diff = line6pcm->last_frame_out - line6pcm->last_frame_in; \ - if ((diff != diff_prev) && (abs(diff) < 100)) { \ - printk(KERN_INFO "%s frame diff = %d\n", op, diff); \ - diff_prev = diff; \ - } \ -} +extern int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels); +extern int line6_pcm_release(struct snd_line6_pcm *line6pcm, int channels); #endif |