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1644 lines
43 KiB
1644 lines
43 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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*/ |
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|
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#include <linux/gfp.h> |
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#include <linux/init.h> |
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#include <linux/ratelimit.h> |
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#include <linux/usb.h> |
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#include <linux/usb/audio.h> |
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#include <linux/slab.h> |
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|
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#include <sound/core.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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|
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#include "usbaudio.h" |
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#include "helper.h" |
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#include "card.h" |
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#include "endpoint.h" |
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#include "pcm.h" |
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#include "clock.h" |
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#include "quirks.h" |
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|
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enum { |
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EP_STATE_STOPPED, |
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EP_STATE_RUNNING, |
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EP_STATE_STOPPING, |
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}; |
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|
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/* interface refcounting */ |
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struct snd_usb_iface_ref { |
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unsigned char iface; |
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bool need_setup; |
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int opened; |
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struct list_head list; |
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}; |
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|
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/* |
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* snd_usb_endpoint is a model that abstracts everything related to an |
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* USB endpoint and its streaming. |
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* |
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* There are functions to activate and deactivate the streaming URBs and |
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* optional callbacks to let the pcm logic handle the actual content of the |
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* packets for playback and record. Thus, the bus streaming and the audio |
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* handlers are fully decoupled. |
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* |
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* There are two different types of endpoints in audio applications. |
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* |
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* SND_USB_ENDPOINT_TYPE_DATA handles full audio data payload for both |
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* inbound and outbound traffic. |
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* |
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* SND_USB_ENDPOINT_TYPE_SYNC endpoints are for inbound traffic only and |
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* expect the payload to carry Q10.14 / Q16.16 formatted sync information |
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* (3 or 4 bytes). |
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* |
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* Each endpoint has to be configured prior to being used by calling |
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* snd_usb_endpoint_set_params(). |
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* |
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* The model incorporates a reference counting, so that multiple users |
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* can call snd_usb_endpoint_start() and snd_usb_endpoint_stop(), and |
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* only the first user will effectively start the URBs, and only the last |
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* one to stop it will tear the URBs down again. |
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*/ |
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|
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/* |
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* convert a sampling rate into our full speed format (fs/1000 in Q16.16) |
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* this will overflow at approx 524 kHz |
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*/ |
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static inline unsigned get_usb_full_speed_rate(unsigned int rate) |
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{ |
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return ((rate << 13) + 62) / 125; |
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} |
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|
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/* |
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* convert a sampling rate into USB high speed format (fs/8000 in Q16.16) |
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* this will overflow at approx 4 MHz |
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*/ |
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static inline unsigned get_usb_high_speed_rate(unsigned int rate) |
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{ |
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return ((rate << 10) + 62) / 125; |
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} |
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|
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/* |
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* release a urb data |
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*/ |
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static void release_urb_ctx(struct snd_urb_ctx *u) |
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{ |
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if (u->buffer_size) |
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usb_free_coherent(u->ep->chip->dev, u->buffer_size, |
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u->urb->transfer_buffer, |
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u->urb->transfer_dma); |
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usb_free_urb(u->urb); |
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u->urb = NULL; |
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} |
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|
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static const char *usb_error_string(int err) |
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{ |
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switch (err) { |
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case -ENODEV: |
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return "no device"; |
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case -ENOENT: |
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return "endpoint not enabled"; |
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case -EPIPE: |
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return "endpoint stalled"; |
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case -ENOSPC: |
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return "not enough bandwidth"; |
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case -ESHUTDOWN: |
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return "device disabled"; |
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case -EHOSTUNREACH: |
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return "device suspended"; |
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case -EINVAL: |
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case -EAGAIN: |
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case -EFBIG: |
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case -EMSGSIZE: |
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return "internal error"; |
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default: |
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return "unknown error"; |
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} |
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} |
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|
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static inline bool ep_state_running(struct snd_usb_endpoint *ep) |
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{ |
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return atomic_read(&ep->state) == EP_STATE_RUNNING; |
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} |
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|
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static inline bool ep_state_update(struct snd_usb_endpoint *ep, int old, int new) |
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{ |
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return atomic_cmpxchg(&ep->state, old, new) == old; |
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} |
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|
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/** |
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* snd_usb_endpoint_implicit_feedback_sink: Report endpoint usage type |
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* |
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* @ep: The snd_usb_endpoint |
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* |
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* Determine whether an endpoint is driven by an implicit feedback |
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* data endpoint source. |
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*/ |
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int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep) |
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{ |
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return ep->implicit_fb_sync && usb_pipeout(ep->pipe); |
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} |
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|
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/* |
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* Return the number of samples to be sent in the next packet |
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* for streaming based on information derived from sync endpoints |
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* |
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* This won't be used for implicit feedback which takes the packet size |
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* returned from the sync source |
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*/ |
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static int slave_next_packet_size(struct snd_usb_endpoint *ep) |
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{ |
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unsigned long flags; |
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int ret; |
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|
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if (ep->fill_max) |
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return ep->maxframesize; |
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|
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spin_lock_irqsave(&ep->lock, flags); |
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ep->phase = (ep->phase & 0xffff) |
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+ (ep->freqm << ep->datainterval); |
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ret = min(ep->phase >> 16, ep->maxframesize); |
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spin_unlock_irqrestore(&ep->lock, flags); |
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|
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return ret; |
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} |
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|
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/* |
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* Return the number of samples to be sent in the next packet |
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* for adaptive and synchronous endpoints |
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*/ |
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static int next_packet_size(struct snd_usb_endpoint *ep) |
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{ |
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int ret; |
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|
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if (ep->fill_max) |
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return ep->maxframesize; |
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|
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ep->sample_accum += ep->sample_rem; |
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if (ep->sample_accum >= ep->pps) { |
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ep->sample_accum -= ep->pps; |
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ret = ep->packsize[1]; |
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} else { |
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ret = ep->packsize[0]; |
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} |
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|
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return ret; |
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} |
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|
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/* |
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* snd_usb_endpoint_next_packet_size: Return the number of samples to be sent |
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* in the next packet |
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*/ |
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int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep, |
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struct snd_urb_ctx *ctx, int idx) |
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{ |
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if (ctx->packet_size[idx]) |
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return ctx->packet_size[idx]; |
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else if (ep->sync_source) |
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return slave_next_packet_size(ep); |
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else |
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return next_packet_size(ep); |
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} |
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|
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static void call_retire_callback(struct snd_usb_endpoint *ep, |
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struct urb *urb) |
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{ |
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struct snd_usb_substream *data_subs; |
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|
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data_subs = READ_ONCE(ep->data_subs); |
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if (data_subs && ep->retire_data_urb) |
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ep->retire_data_urb(data_subs, urb); |
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} |
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|
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static void retire_outbound_urb(struct snd_usb_endpoint *ep, |
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struct snd_urb_ctx *urb_ctx) |
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{ |
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call_retire_callback(ep, urb_ctx->urb); |
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} |
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|
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static void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep, |
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struct snd_usb_endpoint *sender, |
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const struct urb *urb); |
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|
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static void retire_inbound_urb(struct snd_usb_endpoint *ep, |
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struct snd_urb_ctx *urb_ctx) |
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{ |
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struct urb *urb = urb_ctx->urb; |
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struct snd_usb_endpoint *sync_sink; |
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|
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if (unlikely(ep->skip_packets > 0)) { |
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ep->skip_packets--; |
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return; |
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} |
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|
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sync_sink = READ_ONCE(ep->sync_sink); |
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if (sync_sink) |
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snd_usb_handle_sync_urb(sync_sink, ep, urb); |
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|
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call_retire_callback(ep, urb); |
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} |
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|
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static void prepare_silent_urb(struct snd_usb_endpoint *ep, |
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struct snd_urb_ctx *ctx) |
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{ |
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struct urb *urb = ctx->urb; |
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unsigned int offs = 0; |
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unsigned int extra = 0; |
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__le32 packet_length; |
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int i; |
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|
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/* For tx_length_quirk, put packet length at start of packet */ |
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if (ep->chip->tx_length_quirk) |
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extra = sizeof(packet_length); |
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|
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for (i = 0; i < ctx->packets; ++i) { |
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unsigned int offset; |
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unsigned int length; |
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int counts; |
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|
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counts = snd_usb_endpoint_next_packet_size(ep, ctx, i); |
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length = counts * ep->stride; /* number of silent bytes */ |
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offset = offs * ep->stride + extra * i; |
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urb->iso_frame_desc[i].offset = offset; |
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urb->iso_frame_desc[i].length = length + extra; |
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if (extra) { |
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packet_length = cpu_to_le32(length); |
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memcpy(urb->transfer_buffer + offset, |
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&packet_length, sizeof(packet_length)); |
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} |
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memset(urb->transfer_buffer + offset + extra, |
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ep->silence_value, length); |
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offs += counts; |
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} |
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|
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urb->number_of_packets = ctx->packets; |
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urb->transfer_buffer_length = offs * ep->stride + ctx->packets * extra; |
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} |
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|
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/* |
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* Prepare a PLAYBACK urb for submission to the bus. |
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*/ |
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static void prepare_outbound_urb(struct snd_usb_endpoint *ep, |
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struct snd_urb_ctx *ctx) |
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{ |
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struct urb *urb = ctx->urb; |
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unsigned char *cp = urb->transfer_buffer; |
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struct snd_usb_substream *data_subs; |
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|
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urb->dev = ep->chip->dev; /* we need to set this at each time */ |
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|
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switch (ep->type) { |
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case SND_USB_ENDPOINT_TYPE_DATA: |
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data_subs = READ_ONCE(ep->data_subs); |
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if (data_subs && ep->prepare_data_urb) |
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ep->prepare_data_urb(data_subs, urb); |
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else /* no data provider, so send silence */ |
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prepare_silent_urb(ep, ctx); |
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break; |
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|
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case SND_USB_ENDPOINT_TYPE_SYNC: |
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if (snd_usb_get_speed(ep->chip->dev) >= USB_SPEED_HIGH) { |
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/* |
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* fill the length and offset of each urb descriptor. |
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* the fixed 12.13 frequency is passed as 16.16 through the pipe. |
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*/ |
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urb->iso_frame_desc[0].length = 4; |
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urb->iso_frame_desc[0].offset = 0; |
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cp[0] = ep->freqn; |
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cp[1] = ep->freqn >> 8; |
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cp[2] = ep->freqn >> 16; |
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cp[3] = ep->freqn >> 24; |
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} else { |
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/* |
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* fill the length and offset of each urb descriptor. |
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* the fixed 10.14 frequency is passed through the pipe. |
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*/ |
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urb->iso_frame_desc[0].length = 3; |
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urb->iso_frame_desc[0].offset = 0; |
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cp[0] = ep->freqn >> 2; |
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cp[1] = ep->freqn >> 10; |
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cp[2] = ep->freqn >> 18; |
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} |
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|
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break; |
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} |
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} |
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|
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/* |
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* Prepare a CAPTURE or SYNC urb for submission to the bus. |
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*/ |
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static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep, |
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struct snd_urb_ctx *urb_ctx) |
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{ |
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int i, offs; |
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struct urb *urb = urb_ctx->urb; |
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|
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urb->dev = ep->chip->dev; /* we need to set this at each time */ |
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|
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switch (ep->type) { |
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case SND_USB_ENDPOINT_TYPE_DATA: |
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offs = 0; |
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for (i = 0; i < urb_ctx->packets; i++) { |
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urb->iso_frame_desc[i].offset = offs; |
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urb->iso_frame_desc[i].length = ep->curpacksize; |
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offs += ep->curpacksize; |
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} |
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|
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urb->transfer_buffer_length = offs; |
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urb->number_of_packets = urb_ctx->packets; |
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break; |
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|
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case SND_USB_ENDPOINT_TYPE_SYNC: |
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urb->iso_frame_desc[0].length = min(4u, ep->syncmaxsize); |
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urb->iso_frame_desc[0].offset = 0; |
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break; |
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} |
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} |
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|
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/* notify an error as XRUN to the assigned PCM data substream */ |
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static void notify_xrun(struct snd_usb_endpoint *ep) |
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{ |
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struct snd_usb_substream *data_subs; |
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|
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data_subs = READ_ONCE(ep->data_subs); |
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if (data_subs && data_subs->pcm_substream) |
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snd_pcm_stop_xrun(data_subs->pcm_substream); |
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} |
|
|
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static struct snd_usb_packet_info * |
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next_packet_fifo_enqueue(struct snd_usb_endpoint *ep) |
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{ |
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struct snd_usb_packet_info *p; |
|
|
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p = ep->next_packet + (ep->next_packet_head + ep->next_packet_queued) % |
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ARRAY_SIZE(ep->next_packet); |
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ep->next_packet_queued++; |
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return p; |
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} |
|
|
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static struct snd_usb_packet_info * |
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next_packet_fifo_dequeue(struct snd_usb_endpoint *ep) |
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{ |
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struct snd_usb_packet_info *p; |
|
|
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p = ep->next_packet + ep->next_packet_head; |
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ep->next_packet_head++; |
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ep->next_packet_head %= ARRAY_SIZE(ep->next_packet); |
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ep->next_packet_queued--; |
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return p; |
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} |
|
|
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/* |
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* Send output urbs that have been prepared previously. URBs are dequeued |
|
* from ep->ready_playback_urbs and in case there aren't any available |
|
* or there are no packets that have been prepared, this function does |
|
* nothing. |
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* |
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* The reason why the functionality of sending and preparing URBs is separated |
|
* is that host controllers don't guarantee the order in which they return |
|
* inbound and outbound packets to their submitters. |
|
* |
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* This function is only used for implicit feedback endpoints. For endpoints |
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* driven by dedicated sync endpoints, URBs are immediately re-submitted |
|
* from their completion handler. |
|
*/ |
|
static void queue_pending_output_urbs(struct snd_usb_endpoint *ep) |
|
{ |
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while (ep_state_running(ep)) { |
|
|
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unsigned long flags; |
|
struct snd_usb_packet_info *packet; |
|
struct snd_urb_ctx *ctx = NULL; |
|
int err, i; |
|
|
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spin_lock_irqsave(&ep->lock, flags); |
|
if (ep->next_packet_queued > 0 && |
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!list_empty(&ep->ready_playback_urbs)) { |
|
/* take URB out of FIFO */ |
|
ctx = list_first_entry(&ep->ready_playback_urbs, |
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struct snd_urb_ctx, ready_list); |
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list_del_init(&ctx->ready_list); |
|
|
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packet = next_packet_fifo_dequeue(ep); |
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} |
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
|
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if (ctx == NULL) |
|
return; |
|
|
|
/* copy over the length information */ |
|
for (i = 0; i < packet->packets; i++) |
|
ctx->packet_size[i] = packet->packet_size[i]; |
|
|
|
/* call the data handler to fill in playback data */ |
|
prepare_outbound_urb(ep, ctx); |
|
|
|
err = usb_submit_urb(ctx->urb, GFP_ATOMIC); |
|
if (err < 0) { |
|
usb_audio_err(ep->chip, |
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"Unable to submit urb #%d: %d at %s\n", |
|
ctx->index, err, __func__); |
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notify_xrun(ep); |
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return; |
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} |
|
|
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set_bit(ctx->index, &ep->active_mask); |
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} |
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} |
|
|
|
/* |
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* complete callback for urbs |
|
*/ |
|
static void snd_complete_urb(struct urb *urb) |
|
{ |
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struct snd_urb_ctx *ctx = urb->context; |
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struct snd_usb_endpoint *ep = ctx->ep; |
|
unsigned long flags; |
|
int err; |
|
|
|
if (unlikely(urb->status == -ENOENT || /* unlinked */ |
|
urb->status == -ENODEV || /* device removed */ |
|
urb->status == -ECONNRESET || /* unlinked */ |
|
urb->status == -ESHUTDOWN)) /* device disabled */ |
|
goto exit_clear; |
|
/* device disconnected */ |
|
if (unlikely(atomic_read(&ep->chip->shutdown))) |
|
goto exit_clear; |
|
|
|
if (unlikely(!ep_state_running(ep))) |
|
goto exit_clear; |
|
|
|
if (usb_pipeout(ep->pipe)) { |
|
retire_outbound_urb(ep, ctx); |
|
/* can be stopped during retire callback */ |
|
if (unlikely(!ep_state_running(ep))) |
|
goto exit_clear; |
|
|
|
if (snd_usb_endpoint_implicit_feedback_sink(ep)) { |
|
spin_lock_irqsave(&ep->lock, flags); |
|
list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); |
|
clear_bit(ctx->index, &ep->active_mask); |
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
queue_pending_output_urbs(ep); |
|
return; |
|
} |
|
|
|
prepare_outbound_urb(ep, ctx); |
|
/* can be stopped during prepare callback */ |
|
if (unlikely(!ep_state_running(ep))) |
|
goto exit_clear; |
|
} else { |
|
retire_inbound_urb(ep, ctx); |
|
/* can be stopped during retire callback */ |
|
if (unlikely(!ep_state_running(ep))) |
|
goto exit_clear; |
|
|
|
prepare_inbound_urb(ep, ctx); |
|
} |
|
|
|
err = usb_submit_urb(urb, GFP_ATOMIC); |
|
if (err == 0) |
|
return; |
|
|
|
usb_audio_err(ep->chip, "cannot submit urb (err = %d)\n", err); |
|
notify_xrun(ep); |
|
|
|
exit_clear: |
|
clear_bit(ctx->index, &ep->active_mask); |
|
} |
|
|
|
/* |
|
* Find or create a refcount object for the given interface |
|
* |
|
* The objects are released altogether in snd_usb_endpoint_free_all() |
|
*/ |
|
static struct snd_usb_iface_ref * |
|
iface_ref_find(struct snd_usb_audio *chip, int iface) |
|
{ |
|
struct snd_usb_iface_ref *ip; |
|
|
|
list_for_each_entry(ip, &chip->iface_ref_list, list) |
|
if (ip->iface == iface) |
|
return ip; |
|
|
|
ip = kzalloc(sizeof(*ip), GFP_KERNEL); |
|
if (!ip) |
|
return NULL; |
|
ip->iface = iface; |
|
list_add_tail(&ip->list, &chip->iface_ref_list); |
|
return ip; |
|
} |
|
|
|
/* |
|
* Get the existing endpoint object corresponding EP |
|
* Returns NULL if not present. |
|
*/ |
|
struct snd_usb_endpoint * |
|
snd_usb_get_endpoint(struct snd_usb_audio *chip, int ep_num) |
|
{ |
|
struct snd_usb_endpoint *ep; |
|
|
|
list_for_each_entry(ep, &chip->ep_list, list) { |
|
if (ep->ep_num == ep_num) |
|
return ep; |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
#define ep_type_name(type) \ |
|
(type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync") |
|
|
|
/** |
|
* snd_usb_add_endpoint: Add an endpoint to an USB audio chip |
|
* |
|
* @chip: The chip |
|
* @ep_num: The number of the endpoint to use |
|
* @type: SND_USB_ENDPOINT_TYPE_DATA or SND_USB_ENDPOINT_TYPE_SYNC |
|
* |
|
* If the requested endpoint has not been added to the given chip before, |
|
* a new instance is created. |
|
* |
|
* Returns zero on success or a negative error code. |
|
* |
|
* New endpoints will be added to chip->ep_list and freed by |
|
* calling snd_usb_endpoint_free_all(). |
|
* |
|
* For SND_USB_ENDPOINT_TYPE_SYNC, the caller needs to guarantee that |
|
* bNumEndpoints > 1 beforehand. |
|
*/ |
|
int snd_usb_add_endpoint(struct snd_usb_audio *chip, int ep_num, int type) |
|
{ |
|
struct snd_usb_endpoint *ep; |
|
bool is_playback; |
|
|
|
ep = snd_usb_get_endpoint(chip, ep_num); |
|
if (ep) |
|
return 0; |
|
|
|
usb_audio_dbg(chip, "Creating new %s endpoint #%x\n", |
|
ep_type_name(type), |
|
ep_num); |
|
ep = kzalloc(sizeof(*ep), GFP_KERNEL); |
|
if (!ep) |
|
return -ENOMEM; |
|
|
|
ep->chip = chip; |
|
spin_lock_init(&ep->lock); |
|
ep->type = type; |
|
ep->ep_num = ep_num; |
|
INIT_LIST_HEAD(&ep->ready_playback_urbs); |
|
|
|
is_playback = ((ep_num & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT); |
|
ep_num &= USB_ENDPOINT_NUMBER_MASK; |
|
if (is_playback) |
|
ep->pipe = usb_sndisocpipe(chip->dev, ep_num); |
|
else |
|
ep->pipe = usb_rcvisocpipe(chip->dev, ep_num); |
|
|
|
list_add_tail(&ep->list, &chip->ep_list); |
|
return 0; |
|
} |
|
|
|
/* Set up syncinterval and maxsyncsize for a sync EP */ |
|
static void endpoint_set_syncinterval(struct snd_usb_audio *chip, |
|
struct snd_usb_endpoint *ep) |
|
{ |
|
struct usb_host_interface *alts; |
|
struct usb_endpoint_descriptor *desc; |
|
|
|
alts = snd_usb_get_host_interface(chip, ep->iface, ep->altsetting); |
|
if (!alts) |
|
return; |
|
|
|
desc = get_endpoint(alts, ep->ep_idx); |
|
if (desc->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && |
|
desc->bRefresh >= 1 && desc->bRefresh <= 9) |
|
ep->syncinterval = desc->bRefresh; |
|
else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL) |
|
ep->syncinterval = 1; |
|
else if (desc->bInterval >= 1 && desc->bInterval <= 16) |
|
ep->syncinterval = desc->bInterval - 1; |
|
else |
|
ep->syncinterval = 3; |
|
|
|
ep->syncmaxsize = le16_to_cpu(desc->wMaxPacketSize); |
|
} |
|
|
|
static bool endpoint_compatible(struct snd_usb_endpoint *ep, |
|
const struct audioformat *fp, |
|
const struct snd_pcm_hw_params *params) |
|
{ |
|
if (!ep->opened) |
|
return false; |
|
if (ep->cur_audiofmt != fp) |
|
return false; |
|
if (ep->cur_rate != params_rate(params) || |
|
ep->cur_format != params_format(params) || |
|
ep->cur_period_frames != params_period_size(params) || |
|
ep->cur_buffer_periods != params_periods(params)) |
|
return false; |
|
return true; |
|
} |
|
|
|
/* |
|
* Check whether the given fp and hw params are compatbile with the current |
|
* setup of the target EP for implicit feedback sync |
|
*/ |
|
bool snd_usb_endpoint_compatible(struct snd_usb_audio *chip, |
|
struct snd_usb_endpoint *ep, |
|
const struct audioformat *fp, |
|
const struct snd_pcm_hw_params *params) |
|
{ |
|
bool ret; |
|
|
|
mutex_lock(&chip->mutex); |
|
ret = endpoint_compatible(ep, fp, params); |
|
mutex_unlock(&chip->mutex); |
|
return ret; |
|
} |
|
|
|
/* |
|
* snd_usb_endpoint_open: Open the endpoint |
|
* |
|
* Called from hw_params to assign the endpoint to the substream. |
|
* It's reference-counted, and only the first opener is allowed to set up |
|
* arbitrary parameters. The later opener must be compatible with the |
|
* former opened parameters. |
|
* The endpoint needs to be closed via snd_usb_endpoint_close() later. |
|
* |
|
* Note that this function doesn't configure the endpoint. The substream |
|
* needs to set it up later via snd_usb_endpoint_configure(). |
|
*/ |
|
struct snd_usb_endpoint * |
|
snd_usb_endpoint_open(struct snd_usb_audio *chip, |
|
const struct audioformat *fp, |
|
const struct snd_pcm_hw_params *params, |
|
bool is_sync_ep) |
|
{ |
|
struct snd_usb_endpoint *ep; |
|
int ep_num = is_sync_ep ? fp->sync_ep : fp->endpoint; |
|
|
|
mutex_lock(&chip->mutex); |
|
ep = snd_usb_get_endpoint(chip, ep_num); |
|
if (!ep) { |
|
usb_audio_err(chip, "Cannot find EP 0x%x to open\n", ep_num); |
|
goto unlock; |
|
} |
|
|
|
if (!ep->opened) { |
|
if (is_sync_ep) { |
|
ep->iface = fp->sync_iface; |
|
ep->altsetting = fp->sync_altsetting; |
|
ep->ep_idx = fp->sync_ep_idx; |
|
} else { |
|
ep->iface = fp->iface; |
|
ep->altsetting = fp->altsetting; |
|
ep->ep_idx = fp->ep_idx; |
|
} |
|
usb_audio_dbg(chip, "Open EP 0x%x, iface=%d:%d, idx=%d\n", |
|
ep_num, ep->iface, ep->altsetting, ep->ep_idx); |
|
|
|
ep->iface_ref = iface_ref_find(chip, ep->iface); |
|
if (!ep->iface_ref) { |
|
ep = NULL; |
|
goto unlock; |
|
} |
|
|
|
ep->cur_audiofmt = fp; |
|
ep->cur_channels = fp->channels; |
|
ep->cur_rate = params_rate(params); |
|
ep->cur_format = params_format(params); |
|
ep->cur_frame_bytes = snd_pcm_format_physical_width(ep->cur_format) * |
|
ep->cur_channels / 8; |
|
ep->cur_period_frames = params_period_size(params); |
|
ep->cur_period_bytes = ep->cur_period_frames * ep->cur_frame_bytes; |
|
ep->cur_buffer_periods = params_periods(params); |
|
|
|
if (ep->type == SND_USB_ENDPOINT_TYPE_SYNC) |
|
endpoint_set_syncinterval(chip, ep); |
|
|
|
ep->implicit_fb_sync = fp->implicit_fb; |
|
ep->need_setup = true; |
|
|
|
usb_audio_dbg(chip, " channels=%d, rate=%d, format=%s, period_bytes=%d, periods=%d, implicit_fb=%d\n", |
|
ep->cur_channels, ep->cur_rate, |
|
snd_pcm_format_name(ep->cur_format), |
|
ep->cur_period_bytes, ep->cur_buffer_periods, |
|
ep->implicit_fb_sync); |
|
|
|
} else { |
|
if (WARN_ON(!ep->iface_ref)) { |
|
ep = NULL; |
|
goto unlock; |
|
} |
|
|
|
if (!endpoint_compatible(ep, fp, params)) { |
|
usb_audio_err(chip, "Incompatible EP setup for 0x%x\n", |
|
ep_num); |
|
ep = NULL; |
|
goto unlock; |
|
} |
|
|
|
usb_audio_dbg(chip, "Reopened EP 0x%x (count %d)\n", |
|
ep_num, ep->opened); |
|
} |
|
|
|
if (!ep->iface_ref->opened++) |
|
ep->iface_ref->need_setup = true; |
|
|
|
ep->opened++; |
|
|
|
unlock: |
|
mutex_unlock(&chip->mutex); |
|
return ep; |
|
} |
|
|
|
/* |
|
* snd_usb_endpoint_set_sync: Link data and sync endpoints |
|
* |
|
* Pass NULL to sync_ep to unlink again |
|
*/ |
|
void snd_usb_endpoint_set_sync(struct snd_usb_audio *chip, |
|
struct snd_usb_endpoint *data_ep, |
|
struct snd_usb_endpoint *sync_ep) |
|
{ |
|
data_ep->sync_source = sync_ep; |
|
} |
|
|
|
/* |
|
* Set data endpoint callbacks and the assigned data stream |
|
* |
|
* Called at PCM trigger and cleanups. |
|
* Pass NULL to deactivate each callback. |
|
*/ |
|
void snd_usb_endpoint_set_callback(struct snd_usb_endpoint *ep, |
|
void (*prepare)(struct snd_usb_substream *subs, |
|
struct urb *urb), |
|
void (*retire)(struct snd_usb_substream *subs, |
|
struct urb *urb), |
|
struct snd_usb_substream *data_subs) |
|
{ |
|
ep->prepare_data_urb = prepare; |
|
ep->retire_data_urb = retire; |
|
WRITE_ONCE(ep->data_subs, data_subs); |
|
} |
|
|
|
static int endpoint_set_interface(struct snd_usb_audio *chip, |
|
struct snd_usb_endpoint *ep, |
|
bool set) |
|
{ |
|
int altset = set ? ep->altsetting : 0; |
|
int err; |
|
|
|
usb_audio_dbg(chip, "Setting usb interface %d:%d for EP 0x%x\n", |
|
ep->iface, altset, ep->ep_num); |
|
err = usb_set_interface(chip->dev, ep->iface, altset); |
|
if (err < 0) { |
|
usb_audio_err(chip, "%d:%d: usb_set_interface failed (%d)\n", |
|
ep->iface, altset, err); |
|
return err; |
|
} |
|
|
|
snd_usb_set_interface_quirk(chip); |
|
return 0; |
|
} |
|
|
|
/* |
|
* snd_usb_endpoint_close: Close the endpoint |
|
* |
|
* Unreference the already opened endpoint via snd_usb_endpoint_open(). |
|
*/ |
|
void snd_usb_endpoint_close(struct snd_usb_audio *chip, |
|
struct snd_usb_endpoint *ep) |
|
{ |
|
mutex_lock(&chip->mutex); |
|
usb_audio_dbg(chip, "Closing EP 0x%x (count %d)\n", |
|
ep->ep_num, ep->opened); |
|
|
|
if (!--ep->iface_ref->opened) |
|
endpoint_set_interface(chip, ep, false); |
|
|
|
if (!--ep->opened) { |
|
ep->iface = 0; |
|
ep->altsetting = 0; |
|
ep->cur_audiofmt = NULL; |
|
ep->cur_rate = 0; |
|
ep->iface_ref = NULL; |
|
usb_audio_dbg(chip, "EP 0x%x closed\n", ep->ep_num); |
|
} |
|
mutex_unlock(&chip->mutex); |
|
} |
|
|
|
/* Prepare for suspening EP, called from the main suspend handler */ |
|
void snd_usb_endpoint_suspend(struct snd_usb_endpoint *ep) |
|
{ |
|
ep->need_setup = true; |
|
if (ep->iface_ref) |
|
ep->iface_ref->need_setup = true; |
|
} |
|
|
|
/* |
|
* wait until all urbs are processed. |
|
*/ |
|
static int wait_clear_urbs(struct snd_usb_endpoint *ep) |
|
{ |
|
unsigned long end_time = jiffies + msecs_to_jiffies(1000); |
|
int alive; |
|
|
|
if (atomic_read(&ep->state) != EP_STATE_STOPPING) |
|
return 0; |
|
|
|
do { |
|
alive = bitmap_weight(&ep->active_mask, ep->nurbs); |
|
if (!alive) |
|
break; |
|
|
|
schedule_timeout_uninterruptible(1); |
|
} while (time_before(jiffies, end_time)); |
|
|
|
if (alive) |
|
usb_audio_err(ep->chip, |
|
"timeout: still %d active urbs on EP #%x\n", |
|
alive, ep->ep_num); |
|
|
|
if (ep_state_update(ep, EP_STATE_STOPPING, EP_STATE_STOPPED)) { |
|
ep->sync_sink = NULL; |
|
snd_usb_endpoint_set_callback(ep, NULL, NULL, NULL); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* sync the pending stop operation; |
|
* this function itself doesn't trigger the stop operation |
|
*/ |
|
void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep) |
|
{ |
|
if (ep) |
|
wait_clear_urbs(ep); |
|
} |
|
|
|
/* |
|
* Stop active urbs |
|
* |
|
* This function moves the EP to STOPPING state if it's being RUNNING. |
|
*/ |
|
static int stop_urbs(struct snd_usb_endpoint *ep, bool force) |
|
{ |
|
unsigned int i; |
|
|
|
if (!force && atomic_read(&ep->running)) |
|
return -EBUSY; |
|
|
|
if (!ep_state_update(ep, EP_STATE_RUNNING, EP_STATE_STOPPING)) |
|
return 0; |
|
|
|
INIT_LIST_HEAD(&ep->ready_playback_urbs); |
|
ep->next_packet_head = 0; |
|
ep->next_packet_queued = 0; |
|
|
|
for (i = 0; i < ep->nurbs; i++) { |
|
if (test_bit(i, &ep->active_mask)) { |
|
if (!test_and_set_bit(i, &ep->unlink_mask)) { |
|
struct urb *u = ep->urb[i].urb; |
|
usb_unlink_urb(u); |
|
} |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* release an endpoint's urbs |
|
*/ |
|
static int release_urbs(struct snd_usb_endpoint *ep, bool force) |
|
{ |
|
int i, err; |
|
|
|
/* route incoming urbs to nirvana */ |
|
snd_usb_endpoint_set_callback(ep, NULL, NULL, NULL); |
|
|
|
/* stop and unlink urbs */ |
|
err = stop_urbs(ep, force); |
|
if (err) |
|
return err; |
|
|
|
wait_clear_urbs(ep); |
|
|
|
for (i = 0; i < ep->nurbs; i++) |
|
release_urb_ctx(&ep->urb[i]); |
|
|
|
usb_free_coherent(ep->chip->dev, SYNC_URBS * 4, |
|
ep->syncbuf, ep->sync_dma); |
|
|
|
ep->syncbuf = NULL; |
|
ep->nurbs = 0; |
|
return 0; |
|
} |
|
|
|
/* |
|
* configure a data endpoint |
|
*/ |
|
static int data_ep_set_params(struct snd_usb_endpoint *ep) |
|
{ |
|
struct snd_usb_audio *chip = ep->chip; |
|
unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb; |
|
unsigned int max_packs_per_period, urbs_per_period, urb_packs; |
|
unsigned int max_urbs, i; |
|
const struct audioformat *fmt = ep->cur_audiofmt; |
|
int frame_bits = ep->cur_frame_bytes * 8; |
|
int tx_length_quirk = (chip->tx_length_quirk && |
|
usb_pipeout(ep->pipe)); |
|
|
|
usb_audio_dbg(chip, "Setting params for data EP 0x%x, pipe 0x%x\n", |
|
ep->ep_num, ep->pipe); |
|
|
|
if (ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) { |
|
/* |
|
* When operating in DSD DOP mode, the size of a sample frame |
|
* in hardware differs from the actual physical format width |
|
* because we need to make room for the DOP markers. |
|
*/ |
|
frame_bits += ep->cur_channels << 3; |
|
} |
|
|
|
ep->datainterval = fmt->datainterval; |
|
ep->stride = frame_bits >> 3; |
|
|
|
switch (ep->cur_format) { |
|
case SNDRV_PCM_FORMAT_U8: |
|
ep->silence_value = 0x80; |
|
break; |
|
case SNDRV_PCM_FORMAT_DSD_U8: |
|
case SNDRV_PCM_FORMAT_DSD_U16_LE: |
|
case SNDRV_PCM_FORMAT_DSD_U32_LE: |
|
case SNDRV_PCM_FORMAT_DSD_U16_BE: |
|
case SNDRV_PCM_FORMAT_DSD_U32_BE: |
|
ep->silence_value = 0x69; |
|
break; |
|
default: |
|
ep->silence_value = 0; |
|
} |
|
|
|
/* assume max. frequency is 50% higher than nominal */ |
|
ep->freqmax = ep->freqn + (ep->freqn >> 1); |
|
/* Round up freqmax to nearest integer in order to calculate maximum |
|
* packet size, which must represent a whole number of frames. |
|
* This is accomplished by adding 0x0.ffff before converting the |
|
* Q16.16 format into integer. |
|
* In order to accurately calculate the maximum packet size when |
|
* the data interval is more than 1 (i.e. ep->datainterval > 0), |
|
* multiply by the data interval prior to rounding. For instance, |
|
* a freqmax of 41 kHz will result in a max packet size of 6 (5.125) |
|
* frames with a data interval of 1, but 11 (10.25) frames with a |
|
* data interval of 2. |
|
* (ep->freqmax << ep->datainterval overflows at 8.192 MHz for the |
|
* maximum datainterval value of 3, at USB full speed, higher for |
|
* USB high speed, noting that ep->freqmax is in units of |
|
* frames per packet in Q16.16 format.) |
|
*/ |
|
maxsize = (((ep->freqmax << ep->datainterval) + 0xffff) >> 16) * |
|
(frame_bits >> 3); |
|
if (tx_length_quirk) |
|
maxsize += sizeof(__le32); /* Space for length descriptor */ |
|
/* but wMaxPacketSize might reduce this */ |
|
if (ep->maxpacksize && ep->maxpacksize < maxsize) { |
|
/* whatever fits into a max. size packet */ |
|
unsigned int data_maxsize = maxsize = ep->maxpacksize; |
|
|
|
if (tx_length_quirk) |
|
/* Need to remove the length descriptor to calc freq */ |
|
data_maxsize -= sizeof(__le32); |
|
ep->freqmax = (data_maxsize / (frame_bits >> 3)) |
|
<< (16 - ep->datainterval); |
|
} |
|
|
|
if (ep->fill_max) |
|
ep->curpacksize = ep->maxpacksize; |
|
else |
|
ep->curpacksize = maxsize; |
|
|
|
if (snd_usb_get_speed(chip->dev) != USB_SPEED_FULL) { |
|
packs_per_ms = 8 >> ep->datainterval; |
|
max_packs_per_urb = MAX_PACKS_HS; |
|
} else { |
|
packs_per_ms = 1; |
|
max_packs_per_urb = MAX_PACKS; |
|
} |
|
if (ep->sync_source && !ep->implicit_fb_sync) |
|
max_packs_per_urb = min(max_packs_per_urb, |
|
1U << ep->sync_source->syncinterval); |
|
max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval); |
|
|
|
/* |
|
* Capture endpoints need to use small URBs because there's no way |
|
* to tell in advance where the next period will end, and we don't |
|
* want the next URB to complete much after the period ends. |
|
* |
|
* Playback endpoints with implicit sync much use the same parameters |
|
* as their corresponding capture endpoint. |
|
*/ |
|
if (usb_pipein(ep->pipe) || ep->implicit_fb_sync) { |
|
|
|
urb_packs = packs_per_ms; |
|
/* |
|
* Wireless devices can poll at a max rate of once per 4ms. |
|
* For dataintervals less than 5, increase the packet count to |
|
* allow the host controller to use bursting to fill in the |
|
* gaps. |
|
*/ |
|
if (snd_usb_get_speed(chip->dev) == USB_SPEED_WIRELESS) { |
|
int interval = ep->datainterval; |
|
while (interval < 5) { |
|
urb_packs <<= 1; |
|
++interval; |
|
} |
|
} |
|
/* make capture URBs <= 1 ms and smaller than a period */ |
|
urb_packs = min(max_packs_per_urb, urb_packs); |
|
while (urb_packs > 1 && urb_packs * maxsize >= ep->cur_period_bytes) |
|
urb_packs >>= 1; |
|
ep->nurbs = MAX_URBS; |
|
|
|
/* |
|
* Playback endpoints without implicit sync are adjusted so that |
|
* a period fits as evenly as possible in the smallest number of |
|
* URBs. The total number of URBs is adjusted to the size of the |
|
* ALSA buffer, subject to the MAX_URBS and MAX_QUEUE limits. |
|
*/ |
|
} else { |
|
/* determine how small a packet can be */ |
|
minsize = (ep->freqn >> (16 - ep->datainterval)) * |
|
(frame_bits >> 3); |
|
/* with sync from device, assume it can be 12% lower */ |
|
if (ep->sync_source) |
|
minsize -= minsize >> 3; |
|
minsize = max(minsize, 1u); |
|
|
|
/* how many packets will contain an entire ALSA period? */ |
|
max_packs_per_period = DIV_ROUND_UP(ep->cur_period_bytes, minsize); |
|
|
|
/* how many URBs will contain a period? */ |
|
urbs_per_period = DIV_ROUND_UP(max_packs_per_period, |
|
max_packs_per_urb); |
|
/* how many packets are needed in each URB? */ |
|
urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period); |
|
|
|
/* limit the number of frames in a single URB */ |
|
ep->max_urb_frames = DIV_ROUND_UP(ep->cur_period_frames, |
|
urbs_per_period); |
|
|
|
/* try to use enough URBs to contain an entire ALSA buffer */ |
|
max_urbs = min((unsigned) MAX_URBS, |
|
MAX_QUEUE * packs_per_ms / urb_packs); |
|
ep->nurbs = min(max_urbs, urbs_per_period * ep->cur_buffer_periods); |
|
} |
|
|
|
/* allocate and initialize data urbs */ |
|
for (i = 0; i < ep->nurbs; i++) { |
|
struct snd_urb_ctx *u = &ep->urb[i]; |
|
u->index = i; |
|
u->ep = ep; |
|
u->packets = urb_packs; |
|
u->buffer_size = maxsize * u->packets; |
|
|
|
if (fmt->fmt_type == UAC_FORMAT_TYPE_II) |
|
u->packets++; /* for transfer delimiter */ |
|
u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); |
|
if (!u->urb) |
|
goto out_of_memory; |
|
|
|
u->urb->transfer_buffer = |
|
usb_alloc_coherent(chip->dev, u->buffer_size, |
|
GFP_KERNEL, &u->urb->transfer_dma); |
|
if (!u->urb->transfer_buffer) |
|
goto out_of_memory; |
|
u->urb->pipe = ep->pipe; |
|
u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
|
u->urb->interval = 1 << ep->datainterval; |
|
u->urb->context = u; |
|
u->urb->complete = snd_complete_urb; |
|
INIT_LIST_HEAD(&u->ready_list); |
|
} |
|
|
|
return 0; |
|
|
|
out_of_memory: |
|
release_urbs(ep, false); |
|
return -ENOMEM; |
|
} |
|
|
|
/* |
|
* configure a sync endpoint |
|
*/ |
|
static int sync_ep_set_params(struct snd_usb_endpoint *ep) |
|
{ |
|
struct snd_usb_audio *chip = ep->chip; |
|
int i; |
|
|
|
usb_audio_dbg(chip, "Setting params for sync EP 0x%x, pipe 0x%x\n", |
|
ep->ep_num, ep->pipe); |
|
|
|
ep->syncbuf = usb_alloc_coherent(chip->dev, SYNC_URBS * 4, |
|
GFP_KERNEL, &ep->sync_dma); |
|
if (!ep->syncbuf) |
|
return -ENOMEM; |
|
|
|
for (i = 0; i < SYNC_URBS; i++) { |
|
struct snd_urb_ctx *u = &ep->urb[i]; |
|
u->index = i; |
|
u->ep = ep; |
|
u->packets = 1; |
|
u->urb = usb_alloc_urb(1, GFP_KERNEL); |
|
if (!u->urb) |
|
goto out_of_memory; |
|
u->urb->transfer_buffer = ep->syncbuf + i * 4; |
|
u->urb->transfer_dma = ep->sync_dma + i * 4; |
|
u->urb->transfer_buffer_length = 4; |
|
u->urb->pipe = ep->pipe; |
|
u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
|
u->urb->number_of_packets = 1; |
|
u->urb->interval = 1 << ep->syncinterval; |
|
u->urb->context = u; |
|
u->urb->complete = snd_complete_urb; |
|
} |
|
|
|
ep->nurbs = SYNC_URBS; |
|
|
|
return 0; |
|
|
|
out_of_memory: |
|
release_urbs(ep, false); |
|
return -ENOMEM; |
|
} |
|
|
|
/* |
|
* snd_usb_endpoint_set_params: configure an snd_usb_endpoint |
|
* |
|
* Determine the number of URBs to be used on this endpoint. |
|
* An endpoint must be configured before it can be started. |
|
* An endpoint that is already running can not be reconfigured. |
|
*/ |
|
static int snd_usb_endpoint_set_params(struct snd_usb_audio *chip, |
|
struct snd_usb_endpoint *ep) |
|
{ |
|
const struct audioformat *fmt = ep->cur_audiofmt; |
|
int err; |
|
|
|
/* release old buffers, if any */ |
|
err = release_urbs(ep, false); |
|
if (err < 0) |
|
return err; |
|
|
|
ep->datainterval = fmt->datainterval; |
|
ep->maxpacksize = fmt->maxpacksize; |
|
ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX); |
|
|
|
if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL) { |
|
ep->freqn = get_usb_full_speed_rate(ep->cur_rate); |
|
ep->pps = 1000 >> ep->datainterval; |
|
} else { |
|
ep->freqn = get_usb_high_speed_rate(ep->cur_rate); |
|
ep->pps = 8000 >> ep->datainterval; |
|
} |
|
|
|
ep->sample_rem = ep->cur_rate % ep->pps; |
|
ep->packsize[0] = ep->cur_rate / ep->pps; |
|
ep->packsize[1] = (ep->cur_rate + (ep->pps - 1)) / ep->pps; |
|
|
|
/* calculate the frequency in 16.16 format */ |
|
ep->freqm = ep->freqn; |
|
ep->freqshift = INT_MIN; |
|
|
|
ep->phase = 0; |
|
|
|
switch (ep->type) { |
|
case SND_USB_ENDPOINT_TYPE_DATA: |
|
err = data_ep_set_params(ep); |
|
break; |
|
case SND_USB_ENDPOINT_TYPE_SYNC: |
|
err = sync_ep_set_params(ep); |
|
break; |
|
default: |
|
err = -EINVAL; |
|
} |
|
|
|
usb_audio_dbg(chip, "Set up %d URBS, ret=%d\n", ep->nurbs, err); |
|
|
|
if (err < 0) |
|
return err; |
|
|
|
/* some unit conversions in runtime */ |
|
ep->maxframesize = ep->maxpacksize / ep->cur_frame_bytes; |
|
ep->curframesize = ep->curpacksize / ep->cur_frame_bytes; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* snd_usb_endpoint_configure: Configure the endpoint |
|
* |
|
* This function sets up the EP to be fully usable state. |
|
* It's called either from hw_params or prepare callback. |
|
* The function checks need_setup flag, and perfoms nothing unless needed, |
|
* so it's safe to call this multiple times. |
|
* |
|
* This returns zero if unchanged, 1 if the configuration has changed, |
|
* or a negative error code. |
|
*/ |
|
int snd_usb_endpoint_configure(struct snd_usb_audio *chip, |
|
struct snd_usb_endpoint *ep) |
|
{ |
|
bool iface_first; |
|
int err = 0; |
|
|
|
mutex_lock(&chip->mutex); |
|
if (WARN_ON(!ep->iface_ref)) |
|
goto unlock; |
|
if (!ep->need_setup) |
|
goto unlock; |
|
|
|
/* If the interface has been already set up, just set EP parameters */ |
|
if (!ep->iface_ref->need_setup) { |
|
/* sample rate setup of UAC1 is per endpoint, and we need |
|
* to update at each EP configuration |
|
*/ |
|
if (ep->cur_audiofmt->protocol == UAC_VERSION_1) { |
|
err = snd_usb_init_sample_rate(chip, ep->cur_audiofmt, |
|
ep->cur_rate); |
|
if (err < 0) |
|
goto unlock; |
|
} |
|
err = snd_usb_endpoint_set_params(chip, ep); |
|
if (err < 0) |
|
goto unlock; |
|
goto done; |
|
} |
|
|
|
/* Need to deselect altsetting at first */ |
|
endpoint_set_interface(chip, ep, false); |
|
|
|
/* Some UAC1 devices (e.g. Yamaha THR10) need the host interface |
|
* to be set up before parameter setups |
|
*/ |
|
iface_first = ep->cur_audiofmt->protocol == UAC_VERSION_1; |
|
if (iface_first) { |
|
err = endpoint_set_interface(chip, ep, true); |
|
if (err < 0) |
|
goto unlock; |
|
} |
|
|
|
err = snd_usb_init_pitch(chip, ep->cur_audiofmt); |
|
if (err < 0) |
|
goto unlock; |
|
|
|
err = snd_usb_init_sample_rate(chip, ep->cur_audiofmt, ep->cur_rate); |
|
if (err < 0) |
|
goto unlock; |
|
|
|
err = snd_usb_endpoint_set_params(chip, ep); |
|
if (err < 0) |
|
goto unlock; |
|
|
|
err = snd_usb_select_mode_quirk(chip, ep->cur_audiofmt); |
|
if (err < 0) |
|
goto unlock; |
|
|
|
/* for UAC2/3, enable the interface altset here at last */ |
|
if (!iface_first) { |
|
err = endpoint_set_interface(chip, ep, true); |
|
if (err < 0) |
|
goto unlock; |
|
} |
|
|
|
ep->iface_ref->need_setup = false; |
|
|
|
done: |
|
ep->need_setup = false; |
|
err = 1; |
|
|
|
unlock: |
|
mutex_unlock(&chip->mutex); |
|
return err; |
|
} |
|
|
|
/** |
|
* snd_usb_endpoint_start: start an snd_usb_endpoint |
|
* |
|
* @ep: the endpoint to start |
|
* |
|
* A call to this function will increment the running count of the endpoint. |
|
* In case it is not already running, the URBs for this endpoint will be |
|
* submitted. Otherwise, this function does nothing. |
|
* |
|
* Must be balanced to calls of snd_usb_endpoint_stop(). |
|
* |
|
* Returns an error if the URB submission failed, 0 in all other cases. |
|
*/ |
|
int snd_usb_endpoint_start(struct snd_usb_endpoint *ep) |
|
{ |
|
int err; |
|
unsigned int i; |
|
|
|
if (atomic_read(&ep->chip->shutdown)) |
|
return -EBADFD; |
|
|
|
if (ep->sync_source) |
|
WRITE_ONCE(ep->sync_source->sync_sink, ep); |
|
|
|
usb_audio_dbg(ep->chip, "Starting %s EP 0x%x (running %d)\n", |
|
ep_type_name(ep->type), ep->ep_num, |
|
atomic_read(&ep->running)); |
|
|
|
/* already running? */ |
|
if (atomic_inc_return(&ep->running) != 1) |
|
return 0; |
|
|
|
ep->active_mask = 0; |
|
ep->unlink_mask = 0; |
|
ep->phase = 0; |
|
ep->sample_accum = 0; |
|
|
|
snd_usb_endpoint_start_quirk(ep); |
|
|
|
/* |
|
* If this endpoint has a data endpoint as implicit feedback source, |
|
* don't start the urbs here. Instead, mark them all as available, |
|
* wait for the record urbs to return and queue the playback urbs |
|
* from that context. |
|
*/ |
|
|
|
if (!ep_state_update(ep, EP_STATE_STOPPED, EP_STATE_RUNNING)) |
|
goto __error; |
|
|
|
if (snd_usb_endpoint_implicit_feedback_sink(ep)) { |
|
for (i = 0; i < ep->nurbs; i++) { |
|
struct snd_urb_ctx *ctx = ep->urb + i; |
|
list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); |
|
} |
|
|
|
usb_audio_dbg(ep->chip, "No URB submission due to implicit fb sync\n"); |
|
return 0; |
|
} |
|
|
|
for (i = 0; i < ep->nurbs; i++) { |
|
struct urb *urb = ep->urb[i].urb; |
|
|
|
if (snd_BUG_ON(!urb)) |
|
goto __error; |
|
|
|
if (usb_pipeout(ep->pipe)) { |
|
prepare_outbound_urb(ep, urb->context); |
|
} else { |
|
prepare_inbound_urb(ep, urb->context); |
|
} |
|
|
|
err = usb_submit_urb(urb, GFP_ATOMIC); |
|
if (err < 0) { |
|
usb_audio_err(ep->chip, |
|
"cannot submit urb %d, error %d: %s\n", |
|
i, err, usb_error_string(err)); |
|
goto __error; |
|
} |
|
set_bit(i, &ep->active_mask); |
|
} |
|
|
|
usb_audio_dbg(ep->chip, "%d URBs submitted for EP 0x%x\n", |
|
ep->nurbs, ep->ep_num); |
|
return 0; |
|
|
|
__error: |
|
snd_usb_endpoint_stop(ep); |
|
return -EPIPE; |
|
} |
|
|
|
/** |
|
* snd_usb_endpoint_stop: stop an snd_usb_endpoint |
|
* |
|
* @ep: the endpoint to stop (may be NULL) |
|
* |
|
* A call to this function will decrement the running count of the endpoint. |
|
* In case the last user has requested the endpoint stop, the URBs will |
|
* actually be deactivated. |
|
* |
|
* Must be balanced to calls of snd_usb_endpoint_start(). |
|
* |
|
* The caller needs to synchronize the pending stop operation via |
|
* snd_usb_endpoint_sync_pending_stop(). |
|
*/ |
|
void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep) |
|
{ |
|
if (!ep) |
|
return; |
|
|
|
usb_audio_dbg(ep->chip, "Stopping %s EP 0x%x (running %d)\n", |
|
ep_type_name(ep->type), ep->ep_num, |
|
atomic_read(&ep->running)); |
|
|
|
if (snd_BUG_ON(!atomic_read(&ep->running))) |
|
return; |
|
|
|
if (!atomic_dec_return(&ep->running)) { |
|
if (ep->sync_source) |
|
WRITE_ONCE(ep->sync_source->sync_sink, NULL); |
|
stop_urbs(ep, false); |
|
} |
|
} |
|
|
|
/** |
|
* snd_usb_endpoint_release: Tear down an snd_usb_endpoint |
|
* |
|
* @ep: the endpoint to release |
|
* |
|
* This function does not care for the endpoint's running count but will tear |
|
* down all the streaming URBs immediately. |
|
*/ |
|
void snd_usb_endpoint_release(struct snd_usb_endpoint *ep) |
|
{ |
|
release_urbs(ep, true); |
|
} |
|
|
|
/** |
|
* snd_usb_endpoint_free_all: Free the resources of an snd_usb_endpoint |
|
* @chip: The chip |
|
* |
|
* This free all endpoints and those resources |
|
*/ |
|
void snd_usb_endpoint_free_all(struct snd_usb_audio *chip) |
|
{ |
|
struct snd_usb_endpoint *ep, *en; |
|
struct snd_usb_iface_ref *ip, *in; |
|
|
|
list_for_each_entry_safe(ep, en, &chip->ep_list, list) |
|
kfree(ep); |
|
|
|
list_for_each_entry_safe(ip, in, &chip->iface_ref_list, list) |
|
kfree(ip); |
|
} |
|
|
|
/* |
|
* snd_usb_handle_sync_urb: parse an USB sync packet |
|
* |
|
* @ep: the endpoint to handle the packet |
|
* @sender: the sending endpoint |
|
* @urb: the received packet |
|
* |
|
* This function is called from the context of an endpoint that received |
|
* the packet and is used to let another endpoint object handle the payload. |
|
*/ |
|
static void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep, |
|
struct snd_usb_endpoint *sender, |
|
const struct urb *urb) |
|
{ |
|
int shift; |
|
unsigned int f; |
|
unsigned long flags; |
|
|
|
snd_BUG_ON(ep == sender); |
|
|
|
/* |
|
* In case the endpoint is operating in implicit feedback mode, prepare |
|
* a new outbound URB that has the same layout as the received packet |
|
* and add it to the list of pending urbs. queue_pending_output_urbs() |
|
* will take care of them later. |
|
*/ |
|
if (snd_usb_endpoint_implicit_feedback_sink(ep) && |
|
atomic_read(&ep->running)) { |
|
|
|
/* implicit feedback case */ |
|
int i, bytes = 0; |
|
struct snd_urb_ctx *in_ctx; |
|
struct snd_usb_packet_info *out_packet; |
|
|
|
in_ctx = urb->context; |
|
|
|
/* Count overall packet size */ |
|
for (i = 0; i < in_ctx->packets; i++) |
|
if (urb->iso_frame_desc[i].status == 0) |
|
bytes += urb->iso_frame_desc[i].actual_length; |
|
|
|
/* |
|
* skip empty packets. At least M-Audio's Fast Track Ultra stops |
|
* streaming once it received a 0-byte OUT URB |
|
*/ |
|
if (bytes == 0) |
|
return; |
|
|
|
spin_lock_irqsave(&ep->lock, flags); |
|
if (ep->next_packet_queued >= ARRAY_SIZE(ep->next_packet)) { |
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
usb_audio_err(ep->chip, |
|
"next package FIFO overflow EP 0x%x\n", |
|
ep->ep_num); |
|
notify_xrun(ep); |
|
return; |
|
} |
|
|
|
out_packet = next_packet_fifo_enqueue(ep); |
|
|
|
/* |
|
* Iterate through the inbound packet and prepare the lengths |
|
* for the output packet. The OUT packet we are about to send |
|
* will have the same amount of payload bytes per stride as the |
|
* IN packet we just received. Since the actual size is scaled |
|
* by the stride, use the sender stride to calculate the length |
|
* in case the number of channels differ between the implicitly |
|
* fed-back endpoint and the synchronizing endpoint. |
|
*/ |
|
|
|
out_packet->packets = in_ctx->packets; |
|
for (i = 0; i < in_ctx->packets; i++) { |
|
if (urb->iso_frame_desc[i].status == 0) |
|
out_packet->packet_size[i] = |
|
urb->iso_frame_desc[i].actual_length / sender->stride; |
|
else |
|
out_packet->packet_size[i] = 0; |
|
} |
|
|
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
queue_pending_output_urbs(ep); |
|
|
|
return; |
|
} |
|
|
|
/* |
|
* process after playback sync complete |
|
* |
|
* Full speed devices report feedback values in 10.14 format as samples |
|
* per frame, high speed devices in 16.16 format as samples per |
|
* microframe. |
|
* |
|
* Because the Audio Class 1 spec was written before USB 2.0, many high |
|
* speed devices use a wrong interpretation, some others use an |
|
* entirely different format. |
|
* |
|
* Therefore, we cannot predict what format any particular device uses |
|
* and must detect it automatically. |
|
*/ |
|
|
|
if (urb->iso_frame_desc[0].status != 0 || |
|
urb->iso_frame_desc[0].actual_length < 3) |
|
return; |
|
|
|
f = le32_to_cpup(urb->transfer_buffer); |
|
if (urb->iso_frame_desc[0].actual_length == 3) |
|
f &= 0x00ffffff; |
|
else |
|
f &= 0x0fffffff; |
|
|
|
if (f == 0) |
|
return; |
|
|
|
if (unlikely(sender->tenor_fb_quirk)) { |
|
/* |
|
* Devices based on Tenor 8802 chipsets (TEAC UD-H01 |
|
* and others) sometimes change the feedback value |
|
* by +/- 0x1.0000. |
|
*/ |
|
if (f < ep->freqn - 0x8000) |
|
f += 0xf000; |
|
else if (f > ep->freqn + 0x8000) |
|
f -= 0xf000; |
|
} else if (unlikely(ep->freqshift == INT_MIN)) { |
|
/* |
|
* The first time we see a feedback value, determine its format |
|
* by shifting it left or right until it matches the nominal |
|
* frequency value. This assumes that the feedback does not |
|
* differ from the nominal value more than +50% or -25%. |
|
*/ |
|
shift = 0; |
|
while (f < ep->freqn - ep->freqn / 4) { |
|
f <<= 1; |
|
shift++; |
|
} |
|
while (f > ep->freqn + ep->freqn / 2) { |
|
f >>= 1; |
|
shift--; |
|
} |
|
ep->freqshift = shift; |
|
} else if (ep->freqshift >= 0) |
|
f <<= ep->freqshift; |
|
else |
|
f >>= -ep->freqshift; |
|
|
|
if (likely(f >= ep->freqn - ep->freqn / 8 && f <= ep->freqmax)) { |
|
/* |
|
* If the frequency looks valid, set it. |
|
* This value is referred to in prepare_playback_urb(). |
|
*/ |
|
spin_lock_irqsave(&ep->lock, flags); |
|
ep->freqm = f; |
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
} else { |
|
/* |
|
* Out of range; maybe the shift value is wrong. |
|
* Reset it so that we autodetect again the next time. |
|
*/ |
|
ep->freqshift = INT_MIN; |
|
} |
|
} |
|
|
|
|