15fd54aceSGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 2eb9fecb9SRuslan Bilovol /* 3eb9fecb9SRuslan Bilovol * u_audio.c -- interface to USB gadget "ALSA sound card" utilities 4eb9fecb9SRuslan Bilovol * 5eb9fecb9SRuslan Bilovol * Copyright (C) 2016 6eb9fecb9SRuslan Bilovol * Author: Ruslan Bilovol <ruslan.bilovol@gmail.com> 7eb9fecb9SRuslan Bilovol * 8eb9fecb9SRuslan Bilovol * Sound card implementation was cut-and-pasted with changes 9eb9fecb9SRuslan Bilovol * from f_uac2.c and has: 10eb9fecb9SRuslan Bilovol * Copyright (C) 2011 11eb9fecb9SRuslan Bilovol * Yadwinder Singh (yadi.brar01@gmail.com) 12eb9fecb9SRuslan Bilovol * Jaswinder Singh (jaswinder.singh@linaro.org) 13eb9fecb9SRuslan Bilovol */ 14eb9fecb9SRuslan Bilovol 15eb9fecb9SRuslan Bilovol #include <linux/module.h> 16eb9fecb9SRuslan Bilovol #include <sound/core.h> 17eb9fecb9SRuslan Bilovol #include <sound/pcm.h> 18eb9fecb9SRuslan Bilovol #include <sound/pcm_params.h> 19eb9fecb9SRuslan Bilovol 20eb9fecb9SRuslan Bilovol #include "u_audio.h" 21eb9fecb9SRuslan Bilovol 22eb9fecb9SRuslan Bilovol #define BUFF_SIZE_MAX (PAGE_SIZE * 16) 23eb9fecb9SRuslan Bilovol #define PRD_SIZE_MAX PAGE_SIZE 24eb9fecb9SRuslan Bilovol #define MIN_PERIODS 4 25eb9fecb9SRuslan Bilovol 26eb9fecb9SRuslan Bilovol struct uac_req { 27eb9fecb9SRuslan Bilovol struct uac_rtd_params *pp; /* parent param */ 28eb9fecb9SRuslan Bilovol struct usb_request *req; 29eb9fecb9SRuslan Bilovol }; 30eb9fecb9SRuslan Bilovol 31eb9fecb9SRuslan Bilovol /* Runtime data params for one stream */ 32eb9fecb9SRuslan Bilovol struct uac_rtd_params { 33eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac; /* parent chip */ 34eb9fecb9SRuslan Bilovol bool ep_enabled; /* if the ep is enabled */ 35eb9fecb9SRuslan Bilovol 36eb9fecb9SRuslan Bilovol struct snd_pcm_substream *ss; 37eb9fecb9SRuslan Bilovol 38eb9fecb9SRuslan Bilovol /* Ring buffer */ 39eb9fecb9SRuslan Bilovol ssize_t hw_ptr; 40eb9fecb9SRuslan Bilovol 41eb9fecb9SRuslan Bilovol void *rbuf; 42eb9fecb9SRuslan Bilovol 43eb9fecb9SRuslan Bilovol size_t period_size; 44eb9fecb9SRuslan Bilovol 45eb9fecb9SRuslan Bilovol unsigned max_psize; /* MaxPacketSize of endpoint */ 46eb9fecb9SRuslan Bilovol struct uac_req *ureq; 47eb9fecb9SRuslan Bilovol 48eb9fecb9SRuslan Bilovol spinlock_t lock; 49eb9fecb9SRuslan Bilovol }; 50eb9fecb9SRuslan Bilovol 51eb9fecb9SRuslan Bilovol struct snd_uac_chip { 52eb9fecb9SRuslan Bilovol struct g_audio *audio_dev; 53eb9fecb9SRuslan Bilovol 54eb9fecb9SRuslan Bilovol struct uac_rtd_params p_prm; 55eb9fecb9SRuslan Bilovol struct uac_rtd_params c_prm; 56eb9fecb9SRuslan Bilovol 57eb9fecb9SRuslan Bilovol struct snd_card *card; 58eb9fecb9SRuslan Bilovol struct snd_pcm *pcm; 59eb9fecb9SRuslan Bilovol 60eb9fecb9SRuslan Bilovol /* timekeeping for the playback endpoint */ 61eb9fecb9SRuslan Bilovol unsigned int p_interval; 62eb9fecb9SRuslan Bilovol unsigned int p_residue; 63eb9fecb9SRuslan Bilovol 64eb9fecb9SRuslan Bilovol /* pre-calculated values for playback iso completion */ 65eb9fecb9SRuslan Bilovol unsigned int p_pktsize; 66eb9fecb9SRuslan Bilovol unsigned int p_pktsize_residue; 67eb9fecb9SRuslan Bilovol unsigned int p_framesize; 68eb9fecb9SRuslan Bilovol }; 69eb9fecb9SRuslan Bilovol 702ab3c34cSBhumika Goyal static const struct snd_pcm_hardware uac_pcm_hardware = { 71eb9fecb9SRuslan Bilovol .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER 72eb9fecb9SRuslan Bilovol | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID 73eb9fecb9SRuslan Bilovol | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, 74eb9fecb9SRuslan Bilovol .rates = SNDRV_PCM_RATE_CONTINUOUS, 75eb9fecb9SRuslan Bilovol .periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX, 76eb9fecb9SRuslan Bilovol .buffer_bytes_max = BUFF_SIZE_MAX, 77eb9fecb9SRuslan Bilovol .period_bytes_max = PRD_SIZE_MAX, 78eb9fecb9SRuslan Bilovol .periods_min = MIN_PERIODS, 79eb9fecb9SRuslan Bilovol }; 80eb9fecb9SRuslan Bilovol 81eb9fecb9SRuslan Bilovol static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req) 82eb9fecb9SRuslan Bilovol { 83eb9fecb9SRuslan Bilovol unsigned pending; 84eb9fecb9SRuslan Bilovol unsigned long flags; 85eb9fecb9SRuslan Bilovol unsigned int hw_ptr; 86eb9fecb9SRuslan Bilovol bool update_alsa = false; 87eb9fecb9SRuslan Bilovol int status = req->status; 88eb9fecb9SRuslan Bilovol struct uac_req *ur = req->context; 89eb9fecb9SRuslan Bilovol struct snd_pcm_substream *substream; 9096afb54eSVladimir Zapolskiy struct snd_pcm_runtime *runtime; 91eb9fecb9SRuslan Bilovol struct uac_rtd_params *prm = ur->pp; 92eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac = prm->uac; 93eb9fecb9SRuslan Bilovol 94eb9fecb9SRuslan Bilovol /* i/f shutting down */ 95eb9fecb9SRuslan Bilovol if (!prm->ep_enabled || req->status == -ESHUTDOWN) 96eb9fecb9SRuslan Bilovol return; 97eb9fecb9SRuslan Bilovol 98eb9fecb9SRuslan Bilovol /* 99eb9fecb9SRuslan Bilovol * We can't really do much about bad xfers. 100eb9fecb9SRuslan Bilovol * Afterall, the ISOCH xfers could fail legitimately. 101eb9fecb9SRuslan Bilovol */ 102eb9fecb9SRuslan Bilovol if (status) 103eb9fecb9SRuslan Bilovol pr_debug("%s: iso_complete status(%d) %d/%d\n", 104eb9fecb9SRuslan Bilovol __func__, status, req->actual, req->length); 105eb9fecb9SRuslan Bilovol 106eb9fecb9SRuslan Bilovol substream = prm->ss; 107eb9fecb9SRuslan Bilovol 108eb9fecb9SRuslan Bilovol /* Do nothing if ALSA isn't active */ 109eb9fecb9SRuslan Bilovol if (!substream) 110eb9fecb9SRuslan Bilovol goto exit; 111eb9fecb9SRuslan Bilovol 11296afb54eSVladimir Zapolskiy runtime = substream->runtime; 113eb9fecb9SRuslan Bilovol spin_lock_irqsave(&prm->lock, flags); 114eb9fecb9SRuslan Bilovol 115eb9fecb9SRuslan Bilovol if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 116eb9fecb9SRuslan Bilovol /* 117eb9fecb9SRuslan Bilovol * For each IN packet, take the quotient of the current data 118eb9fecb9SRuslan Bilovol * rate and the endpoint's interval as the base packet size. 119eb9fecb9SRuslan Bilovol * If there is a residue from this division, add it to the 120eb9fecb9SRuslan Bilovol * residue accumulator. 121eb9fecb9SRuslan Bilovol */ 122eb9fecb9SRuslan Bilovol req->length = uac->p_pktsize; 123eb9fecb9SRuslan Bilovol uac->p_residue += uac->p_pktsize_residue; 124eb9fecb9SRuslan Bilovol 125eb9fecb9SRuslan Bilovol /* 126eb9fecb9SRuslan Bilovol * Whenever there are more bytes in the accumulator than we 127eb9fecb9SRuslan Bilovol * need to add one more sample frame, increase this packet's 128eb9fecb9SRuslan Bilovol * size and decrease the accumulator. 129eb9fecb9SRuslan Bilovol */ 130eb9fecb9SRuslan Bilovol if (uac->p_residue / uac->p_interval >= uac->p_framesize) { 131eb9fecb9SRuslan Bilovol req->length += uac->p_framesize; 132eb9fecb9SRuslan Bilovol uac->p_residue -= uac->p_framesize * 133eb9fecb9SRuslan Bilovol uac->p_interval; 134eb9fecb9SRuslan Bilovol } 135eb9fecb9SRuslan Bilovol 136eb9fecb9SRuslan Bilovol req->actual = req->length; 137eb9fecb9SRuslan Bilovol } 138eb9fecb9SRuslan Bilovol 139eb9fecb9SRuslan Bilovol pending = prm->hw_ptr % prm->period_size; 140eb9fecb9SRuslan Bilovol pending += req->actual; 141eb9fecb9SRuslan Bilovol if (pending >= prm->period_size) 142eb9fecb9SRuslan Bilovol update_alsa = true; 143eb9fecb9SRuslan Bilovol 144eb9fecb9SRuslan Bilovol hw_ptr = prm->hw_ptr; 145eb9fecb9SRuslan Bilovol 146eb9fecb9SRuslan Bilovol spin_unlock_irqrestore(&prm->lock, flags); 147eb9fecb9SRuslan Bilovol 148eb9fecb9SRuslan Bilovol /* Pack USB load in ALSA ring buffer */ 14996afb54eSVladimir Zapolskiy pending = runtime->dma_bytes - hw_ptr; 150eb9fecb9SRuslan Bilovol 151eb9fecb9SRuslan Bilovol if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 152eb9fecb9SRuslan Bilovol if (unlikely(pending < req->actual)) { 15396afb54eSVladimir Zapolskiy memcpy(req->buf, runtime->dma_area + hw_ptr, pending); 15496afb54eSVladimir Zapolskiy memcpy(req->buf + pending, runtime->dma_area, 155eb9fecb9SRuslan Bilovol req->actual - pending); 156eb9fecb9SRuslan Bilovol } else { 15796afb54eSVladimir Zapolskiy memcpy(req->buf, runtime->dma_area + hw_ptr, 15896afb54eSVladimir Zapolskiy req->actual); 159eb9fecb9SRuslan Bilovol } 160eb9fecb9SRuslan Bilovol } else { 161eb9fecb9SRuslan Bilovol if (unlikely(pending < req->actual)) { 16296afb54eSVladimir Zapolskiy memcpy(runtime->dma_area + hw_ptr, req->buf, pending); 16396afb54eSVladimir Zapolskiy memcpy(runtime->dma_area, req->buf + pending, 164eb9fecb9SRuslan Bilovol req->actual - pending); 165eb9fecb9SRuslan Bilovol } else { 16696afb54eSVladimir Zapolskiy memcpy(runtime->dma_area + hw_ptr, req->buf, 16796afb54eSVladimir Zapolskiy req->actual); 168eb9fecb9SRuslan Bilovol } 169eb9fecb9SRuslan Bilovol } 170eb9fecb9SRuslan Bilovol 1716b37bd78SJoshua Frkuska spin_lock_irqsave(&prm->lock, flags); 1726b37bd78SJoshua Frkuska /* update hw_ptr after data is copied to memory */ 17396afb54eSVladimir Zapolskiy prm->hw_ptr = (hw_ptr + req->actual) % runtime->dma_bytes; 1746b37bd78SJoshua Frkuska spin_unlock_irqrestore(&prm->lock, flags); 1756b37bd78SJoshua Frkuska 176eb9fecb9SRuslan Bilovol exit: 177eb9fecb9SRuslan Bilovol if (usb_ep_queue(ep, req, GFP_ATOMIC)) 178eb9fecb9SRuslan Bilovol dev_err(uac->card->dev, "%d Error!\n", __LINE__); 179eb9fecb9SRuslan Bilovol 180eb9fecb9SRuslan Bilovol if (update_alsa) 181eb9fecb9SRuslan Bilovol snd_pcm_period_elapsed(substream); 182eb9fecb9SRuslan Bilovol } 183eb9fecb9SRuslan Bilovol 184eb9fecb9SRuslan Bilovol static int uac_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 185eb9fecb9SRuslan Bilovol { 186eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac = snd_pcm_substream_chip(substream); 187eb9fecb9SRuslan Bilovol struct uac_rtd_params *prm; 188eb9fecb9SRuslan Bilovol struct g_audio *audio_dev; 189eb9fecb9SRuslan Bilovol struct uac_params *params; 190eb9fecb9SRuslan Bilovol unsigned long flags; 191eb9fecb9SRuslan Bilovol int err = 0; 192eb9fecb9SRuslan Bilovol 193eb9fecb9SRuslan Bilovol audio_dev = uac->audio_dev; 194eb9fecb9SRuslan Bilovol params = &audio_dev->params; 195eb9fecb9SRuslan Bilovol 196eb9fecb9SRuslan Bilovol if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 197eb9fecb9SRuslan Bilovol prm = &uac->p_prm; 198eb9fecb9SRuslan Bilovol else 199eb9fecb9SRuslan Bilovol prm = &uac->c_prm; 200eb9fecb9SRuslan Bilovol 201eb9fecb9SRuslan Bilovol spin_lock_irqsave(&prm->lock, flags); 202eb9fecb9SRuslan Bilovol 203eb9fecb9SRuslan Bilovol /* Reset */ 204eb9fecb9SRuslan Bilovol prm->hw_ptr = 0; 205eb9fecb9SRuslan Bilovol 206eb9fecb9SRuslan Bilovol switch (cmd) { 207eb9fecb9SRuslan Bilovol case SNDRV_PCM_TRIGGER_START: 208eb9fecb9SRuslan Bilovol case SNDRV_PCM_TRIGGER_RESUME: 209eb9fecb9SRuslan Bilovol prm->ss = substream; 210eb9fecb9SRuslan Bilovol break; 211eb9fecb9SRuslan Bilovol case SNDRV_PCM_TRIGGER_STOP: 212eb9fecb9SRuslan Bilovol case SNDRV_PCM_TRIGGER_SUSPEND: 213eb9fecb9SRuslan Bilovol prm->ss = NULL; 214eb9fecb9SRuslan Bilovol break; 215eb9fecb9SRuslan Bilovol default: 216eb9fecb9SRuslan Bilovol err = -EINVAL; 217eb9fecb9SRuslan Bilovol } 218eb9fecb9SRuslan Bilovol 219eb9fecb9SRuslan Bilovol spin_unlock_irqrestore(&prm->lock, flags); 220eb9fecb9SRuslan Bilovol 221eb9fecb9SRuslan Bilovol /* Clear buffer after Play stops */ 222eb9fecb9SRuslan Bilovol if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss) 223eb9fecb9SRuslan Bilovol memset(prm->rbuf, 0, prm->max_psize * params->req_number); 224eb9fecb9SRuslan Bilovol 225eb9fecb9SRuslan Bilovol return err; 226eb9fecb9SRuslan Bilovol } 227eb9fecb9SRuslan Bilovol 228eb9fecb9SRuslan Bilovol static snd_pcm_uframes_t uac_pcm_pointer(struct snd_pcm_substream *substream) 229eb9fecb9SRuslan Bilovol { 230eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac = snd_pcm_substream_chip(substream); 231eb9fecb9SRuslan Bilovol struct uac_rtd_params *prm; 232eb9fecb9SRuslan Bilovol 233eb9fecb9SRuslan Bilovol if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 234eb9fecb9SRuslan Bilovol prm = &uac->p_prm; 235eb9fecb9SRuslan Bilovol else 236eb9fecb9SRuslan Bilovol prm = &uac->c_prm; 237eb9fecb9SRuslan Bilovol 238eb9fecb9SRuslan Bilovol return bytes_to_frames(substream->runtime, prm->hw_ptr); 239eb9fecb9SRuslan Bilovol } 240eb9fecb9SRuslan Bilovol 241eb9fecb9SRuslan Bilovol static int uac_pcm_hw_params(struct snd_pcm_substream *substream, 242eb9fecb9SRuslan Bilovol struct snd_pcm_hw_params *hw_params) 243eb9fecb9SRuslan Bilovol { 244eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac = snd_pcm_substream_chip(substream); 245eb9fecb9SRuslan Bilovol struct uac_rtd_params *prm; 246eb9fecb9SRuslan Bilovol int err; 247eb9fecb9SRuslan Bilovol 248eb9fecb9SRuslan Bilovol if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 249eb9fecb9SRuslan Bilovol prm = &uac->p_prm; 250eb9fecb9SRuslan Bilovol else 251eb9fecb9SRuslan Bilovol prm = &uac->c_prm; 252eb9fecb9SRuslan Bilovol 253eb9fecb9SRuslan Bilovol err = snd_pcm_lib_malloc_pages(substream, 254eb9fecb9SRuslan Bilovol params_buffer_bytes(hw_params)); 25596afb54eSVladimir Zapolskiy if (err >= 0) 256eb9fecb9SRuslan Bilovol prm->period_size = params_period_bytes(hw_params); 257eb9fecb9SRuslan Bilovol 258eb9fecb9SRuslan Bilovol return err; 259eb9fecb9SRuslan Bilovol } 260eb9fecb9SRuslan Bilovol 261eb9fecb9SRuslan Bilovol static int uac_pcm_hw_free(struct snd_pcm_substream *substream) 262eb9fecb9SRuslan Bilovol { 263eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac = snd_pcm_substream_chip(substream); 264eb9fecb9SRuslan Bilovol struct uac_rtd_params *prm; 265eb9fecb9SRuslan Bilovol 266eb9fecb9SRuslan Bilovol if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 267eb9fecb9SRuslan Bilovol prm = &uac->p_prm; 268eb9fecb9SRuslan Bilovol else 269eb9fecb9SRuslan Bilovol prm = &uac->c_prm; 270eb9fecb9SRuslan Bilovol 271eb9fecb9SRuslan Bilovol prm->period_size = 0; 272eb9fecb9SRuslan Bilovol 273eb9fecb9SRuslan Bilovol return snd_pcm_lib_free_pages(substream); 274eb9fecb9SRuslan Bilovol } 275eb9fecb9SRuslan Bilovol 276eb9fecb9SRuslan Bilovol static int uac_pcm_open(struct snd_pcm_substream *substream) 277eb9fecb9SRuslan Bilovol { 278eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac = snd_pcm_substream_chip(substream); 279eb9fecb9SRuslan Bilovol struct snd_pcm_runtime *runtime = substream->runtime; 280eb9fecb9SRuslan Bilovol struct g_audio *audio_dev; 281eb9fecb9SRuslan Bilovol struct uac_params *params; 282eb9fecb9SRuslan Bilovol int p_ssize, c_ssize; 283eb9fecb9SRuslan Bilovol int p_srate, c_srate; 284eb9fecb9SRuslan Bilovol int p_chmask, c_chmask; 285eb9fecb9SRuslan Bilovol 286eb9fecb9SRuslan Bilovol audio_dev = uac->audio_dev; 287eb9fecb9SRuslan Bilovol params = &audio_dev->params; 288eb9fecb9SRuslan Bilovol p_ssize = params->p_ssize; 289eb9fecb9SRuslan Bilovol c_ssize = params->c_ssize; 290eb9fecb9SRuslan Bilovol p_srate = params->p_srate; 291eb9fecb9SRuslan Bilovol c_srate = params->c_srate; 292eb9fecb9SRuslan Bilovol p_chmask = params->p_chmask; 293eb9fecb9SRuslan Bilovol c_chmask = params->c_chmask; 294eb9fecb9SRuslan Bilovol uac->p_residue = 0; 295eb9fecb9SRuslan Bilovol 296eb9fecb9SRuslan Bilovol runtime->hw = uac_pcm_hardware; 297eb9fecb9SRuslan Bilovol 298eb9fecb9SRuslan Bilovol if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 299eb9fecb9SRuslan Bilovol spin_lock_init(&uac->p_prm.lock); 300eb9fecb9SRuslan Bilovol runtime->hw.rate_min = p_srate; 301eb9fecb9SRuslan Bilovol switch (p_ssize) { 302eb9fecb9SRuslan Bilovol case 3: 303eb9fecb9SRuslan Bilovol runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE; 304eb9fecb9SRuslan Bilovol break; 305eb9fecb9SRuslan Bilovol case 4: 306eb9fecb9SRuslan Bilovol runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE; 307eb9fecb9SRuslan Bilovol break; 308eb9fecb9SRuslan Bilovol default: 309eb9fecb9SRuslan Bilovol runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; 310eb9fecb9SRuslan Bilovol break; 311eb9fecb9SRuslan Bilovol } 312eb9fecb9SRuslan Bilovol runtime->hw.channels_min = num_channels(p_chmask); 313eb9fecb9SRuslan Bilovol runtime->hw.period_bytes_min = 2 * uac->p_prm.max_psize 314eb9fecb9SRuslan Bilovol / runtime->hw.periods_min; 315eb9fecb9SRuslan Bilovol } else { 316eb9fecb9SRuslan Bilovol spin_lock_init(&uac->c_prm.lock); 317eb9fecb9SRuslan Bilovol runtime->hw.rate_min = c_srate; 318eb9fecb9SRuslan Bilovol switch (c_ssize) { 319eb9fecb9SRuslan Bilovol case 3: 320eb9fecb9SRuslan Bilovol runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE; 321eb9fecb9SRuslan Bilovol break; 322eb9fecb9SRuslan Bilovol case 4: 323eb9fecb9SRuslan Bilovol runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE; 324eb9fecb9SRuslan Bilovol break; 325eb9fecb9SRuslan Bilovol default: 326eb9fecb9SRuslan Bilovol runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; 327eb9fecb9SRuslan Bilovol break; 328eb9fecb9SRuslan Bilovol } 329eb9fecb9SRuslan Bilovol runtime->hw.channels_min = num_channels(c_chmask); 330eb9fecb9SRuslan Bilovol runtime->hw.period_bytes_min = 2 * uac->c_prm.max_psize 331eb9fecb9SRuslan Bilovol / runtime->hw.periods_min; 332eb9fecb9SRuslan Bilovol } 333eb9fecb9SRuslan Bilovol 334eb9fecb9SRuslan Bilovol runtime->hw.rate_max = runtime->hw.rate_min; 335eb9fecb9SRuslan Bilovol runtime->hw.channels_max = runtime->hw.channels_min; 336eb9fecb9SRuslan Bilovol 337eb9fecb9SRuslan Bilovol snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 338eb9fecb9SRuslan Bilovol 339eb9fecb9SRuslan Bilovol return 0; 340eb9fecb9SRuslan Bilovol } 341eb9fecb9SRuslan Bilovol 342eb9fecb9SRuslan Bilovol /* ALSA cries without these function pointers */ 343eb9fecb9SRuslan Bilovol static int uac_pcm_null(struct snd_pcm_substream *substream) 344eb9fecb9SRuslan Bilovol { 345eb9fecb9SRuslan Bilovol return 0; 346eb9fecb9SRuslan Bilovol } 347eb9fecb9SRuslan Bilovol 348640c0be8SArvind Yadav static const struct snd_pcm_ops uac_pcm_ops = { 349eb9fecb9SRuslan Bilovol .open = uac_pcm_open, 350eb9fecb9SRuslan Bilovol .close = uac_pcm_null, 351eb9fecb9SRuslan Bilovol .ioctl = snd_pcm_lib_ioctl, 352eb9fecb9SRuslan Bilovol .hw_params = uac_pcm_hw_params, 353eb9fecb9SRuslan Bilovol .hw_free = uac_pcm_hw_free, 354eb9fecb9SRuslan Bilovol .trigger = uac_pcm_trigger, 355eb9fecb9SRuslan Bilovol .pointer = uac_pcm_pointer, 356eb9fecb9SRuslan Bilovol .prepare = uac_pcm_null, 357eb9fecb9SRuslan Bilovol }; 358eb9fecb9SRuslan Bilovol 359eb9fecb9SRuslan Bilovol static inline void free_ep(struct uac_rtd_params *prm, struct usb_ep *ep) 360eb9fecb9SRuslan Bilovol { 361eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac = prm->uac; 362eb9fecb9SRuslan Bilovol struct g_audio *audio_dev; 363eb9fecb9SRuslan Bilovol struct uac_params *params; 364eb9fecb9SRuslan Bilovol int i; 365eb9fecb9SRuslan Bilovol 366eb9fecb9SRuslan Bilovol if (!prm->ep_enabled) 367eb9fecb9SRuslan Bilovol return; 368eb9fecb9SRuslan Bilovol 369eb9fecb9SRuslan Bilovol prm->ep_enabled = false; 370eb9fecb9SRuslan Bilovol 371eb9fecb9SRuslan Bilovol audio_dev = uac->audio_dev; 372eb9fecb9SRuslan Bilovol params = &audio_dev->params; 373eb9fecb9SRuslan Bilovol 374eb9fecb9SRuslan Bilovol for (i = 0; i < params->req_number; i++) { 375eb9fecb9SRuslan Bilovol if (prm->ureq[i].req) { 376eb9fecb9SRuslan Bilovol usb_ep_dequeue(ep, prm->ureq[i].req); 377eb9fecb9SRuslan Bilovol usb_ep_free_request(ep, prm->ureq[i].req); 378eb9fecb9SRuslan Bilovol prm->ureq[i].req = NULL; 379eb9fecb9SRuslan Bilovol } 380eb9fecb9SRuslan Bilovol } 381eb9fecb9SRuslan Bilovol 382eb9fecb9SRuslan Bilovol if (usb_ep_disable(ep)) 383eb9fecb9SRuslan Bilovol dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__); 384eb9fecb9SRuslan Bilovol } 385eb9fecb9SRuslan Bilovol 386eb9fecb9SRuslan Bilovol 387eb9fecb9SRuslan Bilovol int u_audio_start_capture(struct g_audio *audio_dev) 388eb9fecb9SRuslan Bilovol { 389eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac = audio_dev->uac; 390eb9fecb9SRuslan Bilovol struct usb_gadget *gadget = audio_dev->gadget; 391eb9fecb9SRuslan Bilovol struct device *dev = &gadget->dev; 392eb9fecb9SRuslan Bilovol struct usb_request *req; 393eb9fecb9SRuslan Bilovol struct usb_ep *ep; 394eb9fecb9SRuslan Bilovol struct uac_rtd_params *prm; 395eb9fecb9SRuslan Bilovol struct uac_params *params = &audio_dev->params; 396eb9fecb9SRuslan Bilovol int req_len, i; 397eb9fecb9SRuslan Bilovol 398eb9fecb9SRuslan Bilovol ep = audio_dev->out_ep; 399eb9fecb9SRuslan Bilovol prm = &uac->c_prm; 400eb9fecb9SRuslan Bilovol config_ep_by_speed(gadget, &audio_dev->func, ep); 401eb9fecb9SRuslan Bilovol req_len = prm->max_psize; 402eb9fecb9SRuslan Bilovol 403eb9fecb9SRuslan Bilovol prm->ep_enabled = true; 404eb9fecb9SRuslan Bilovol usb_ep_enable(ep); 405eb9fecb9SRuslan Bilovol 406eb9fecb9SRuslan Bilovol for (i = 0; i < params->req_number; i++) { 407eb9fecb9SRuslan Bilovol if (!prm->ureq[i].req) { 408eb9fecb9SRuslan Bilovol req = usb_ep_alloc_request(ep, GFP_ATOMIC); 409eb9fecb9SRuslan Bilovol if (req == NULL) 410eb9fecb9SRuslan Bilovol return -ENOMEM; 411eb9fecb9SRuslan Bilovol 412eb9fecb9SRuslan Bilovol prm->ureq[i].req = req; 413eb9fecb9SRuslan Bilovol prm->ureq[i].pp = prm; 414eb9fecb9SRuslan Bilovol 415eb9fecb9SRuslan Bilovol req->zero = 0; 416eb9fecb9SRuslan Bilovol req->context = &prm->ureq[i]; 417eb9fecb9SRuslan Bilovol req->length = req_len; 418eb9fecb9SRuslan Bilovol req->complete = u_audio_iso_complete; 419eb9fecb9SRuslan Bilovol req->buf = prm->rbuf + i * prm->max_psize; 420eb9fecb9SRuslan Bilovol } 421eb9fecb9SRuslan Bilovol 422eb9fecb9SRuslan Bilovol if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC)) 423eb9fecb9SRuslan Bilovol dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 424eb9fecb9SRuslan Bilovol } 425eb9fecb9SRuslan Bilovol 426eb9fecb9SRuslan Bilovol return 0; 427eb9fecb9SRuslan Bilovol } 428eb9fecb9SRuslan Bilovol EXPORT_SYMBOL_GPL(u_audio_start_capture); 429eb9fecb9SRuslan Bilovol 430eb9fecb9SRuslan Bilovol void u_audio_stop_capture(struct g_audio *audio_dev) 431eb9fecb9SRuslan Bilovol { 432eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac = audio_dev->uac; 433eb9fecb9SRuslan Bilovol 434eb9fecb9SRuslan Bilovol free_ep(&uac->c_prm, audio_dev->out_ep); 435eb9fecb9SRuslan Bilovol } 436eb9fecb9SRuslan Bilovol EXPORT_SYMBOL_GPL(u_audio_stop_capture); 437eb9fecb9SRuslan Bilovol 438eb9fecb9SRuslan Bilovol int u_audio_start_playback(struct g_audio *audio_dev) 439eb9fecb9SRuslan Bilovol { 440eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac = audio_dev->uac; 441eb9fecb9SRuslan Bilovol struct usb_gadget *gadget = audio_dev->gadget; 442eb9fecb9SRuslan Bilovol struct device *dev = &gadget->dev; 443eb9fecb9SRuslan Bilovol struct usb_request *req; 444eb9fecb9SRuslan Bilovol struct usb_ep *ep; 445eb9fecb9SRuslan Bilovol struct uac_rtd_params *prm; 446eb9fecb9SRuslan Bilovol struct uac_params *params = &audio_dev->params; 447eb9fecb9SRuslan Bilovol unsigned int factor, rate; 448eb9fecb9SRuslan Bilovol const struct usb_endpoint_descriptor *ep_desc; 449eb9fecb9SRuslan Bilovol int req_len, i; 450eb9fecb9SRuslan Bilovol 451eb9fecb9SRuslan Bilovol ep = audio_dev->in_ep; 452eb9fecb9SRuslan Bilovol prm = &uac->p_prm; 453eb9fecb9SRuslan Bilovol config_ep_by_speed(gadget, &audio_dev->func, ep); 454eb9fecb9SRuslan Bilovol 455eb9fecb9SRuslan Bilovol ep_desc = ep->desc; 456eb9fecb9SRuslan Bilovol 457eb9fecb9SRuslan Bilovol /* pre-calculate the playback endpoint's interval */ 458eb9fecb9SRuslan Bilovol if (gadget->speed == USB_SPEED_FULL) 459eb9fecb9SRuslan Bilovol factor = 1000; 460eb9fecb9SRuslan Bilovol else 461eb9fecb9SRuslan Bilovol factor = 8000; 462eb9fecb9SRuslan Bilovol 463eb9fecb9SRuslan Bilovol /* pre-compute some values for iso_complete() */ 464eb9fecb9SRuslan Bilovol uac->p_framesize = params->p_ssize * 465eb9fecb9SRuslan Bilovol num_channels(params->p_chmask); 466eb9fecb9SRuslan Bilovol rate = params->p_srate * uac->p_framesize; 467eb9fecb9SRuslan Bilovol uac->p_interval = factor / (1 << (ep_desc->bInterval - 1)); 468eb9fecb9SRuslan Bilovol uac->p_pktsize = min_t(unsigned int, rate / uac->p_interval, 469eb9fecb9SRuslan Bilovol prm->max_psize); 470eb9fecb9SRuslan Bilovol 471eb9fecb9SRuslan Bilovol if (uac->p_pktsize < prm->max_psize) 472eb9fecb9SRuslan Bilovol uac->p_pktsize_residue = rate % uac->p_interval; 473eb9fecb9SRuslan Bilovol else 474eb9fecb9SRuslan Bilovol uac->p_pktsize_residue = 0; 475eb9fecb9SRuslan Bilovol 476eb9fecb9SRuslan Bilovol req_len = uac->p_pktsize; 477eb9fecb9SRuslan Bilovol uac->p_residue = 0; 478eb9fecb9SRuslan Bilovol 479eb9fecb9SRuslan Bilovol prm->ep_enabled = true; 480eb9fecb9SRuslan Bilovol usb_ep_enable(ep); 481eb9fecb9SRuslan Bilovol 482eb9fecb9SRuslan Bilovol for (i = 0; i < params->req_number; i++) { 483eb9fecb9SRuslan Bilovol if (!prm->ureq[i].req) { 484eb9fecb9SRuslan Bilovol req = usb_ep_alloc_request(ep, GFP_ATOMIC); 485eb9fecb9SRuslan Bilovol if (req == NULL) 486eb9fecb9SRuslan Bilovol return -ENOMEM; 487eb9fecb9SRuslan Bilovol 488eb9fecb9SRuslan Bilovol prm->ureq[i].req = req; 489eb9fecb9SRuslan Bilovol prm->ureq[i].pp = prm; 490eb9fecb9SRuslan Bilovol 491eb9fecb9SRuslan Bilovol req->zero = 0; 492eb9fecb9SRuslan Bilovol req->context = &prm->ureq[i]; 493eb9fecb9SRuslan Bilovol req->length = req_len; 494eb9fecb9SRuslan Bilovol req->complete = u_audio_iso_complete; 495eb9fecb9SRuslan Bilovol req->buf = prm->rbuf + i * prm->max_psize; 496eb9fecb9SRuslan Bilovol } 497eb9fecb9SRuslan Bilovol 498eb9fecb9SRuslan Bilovol if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC)) 499eb9fecb9SRuslan Bilovol dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 500eb9fecb9SRuslan Bilovol } 501eb9fecb9SRuslan Bilovol 502eb9fecb9SRuslan Bilovol return 0; 503eb9fecb9SRuslan Bilovol } 504eb9fecb9SRuslan Bilovol EXPORT_SYMBOL_GPL(u_audio_start_playback); 505eb9fecb9SRuslan Bilovol 506eb9fecb9SRuslan Bilovol void u_audio_stop_playback(struct g_audio *audio_dev) 507eb9fecb9SRuslan Bilovol { 508eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac = audio_dev->uac; 509eb9fecb9SRuslan Bilovol 510eb9fecb9SRuslan Bilovol free_ep(&uac->p_prm, audio_dev->in_ep); 511eb9fecb9SRuslan Bilovol } 512eb9fecb9SRuslan Bilovol EXPORT_SYMBOL_GPL(u_audio_stop_playback); 513eb9fecb9SRuslan Bilovol 514eb9fecb9SRuslan Bilovol int g_audio_setup(struct g_audio *g_audio, const char *pcm_name, 515eb9fecb9SRuslan Bilovol const char *card_name) 516eb9fecb9SRuslan Bilovol { 517eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac; 518eb9fecb9SRuslan Bilovol struct snd_card *card; 519eb9fecb9SRuslan Bilovol struct snd_pcm *pcm; 520eb9fecb9SRuslan Bilovol struct uac_params *params; 521eb9fecb9SRuslan Bilovol int p_chmask, c_chmask; 522eb9fecb9SRuslan Bilovol int err; 523eb9fecb9SRuslan Bilovol 524eb9fecb9SRuslan Bilovol if (!g_audio) 525eb9fecb9SRuslan Bilovol return -EINVAL; 526eb9fecb9SRuslan Bilovol 527eb9fecb9SRuslan Bilovol uac = kzalloc(sizeof(*uac), GFP_KERNEL); 528eb9fecb9SRuslan Bilovol if (!uac) 529eb9fecb9SRuslan Bilovol return -ENOMEM; 530eb9fecb9SRuslan Bilovol g_audio->uac = uac; 531eb9fecb9SRuslan Bilovol uac->audio_dev = g_audio; 532eb9fecb9SRuslan Bilovol 533eb9fecb9SRuslan Bilovol params = &g_audio->params; 534eb9fecb9SRuslan Bilovol p_chmask = params->p_chmask; 535eb9fecb9SRuslan Bilovol c_chmask = params->c_chmask; 536eb9fecb9SRuslan Bilovol 537eb9fecb9SRuslan Bilovol if (c_chmask) { 538eb9fecb9SRuslan Bilovol struct uac_rtd_params *prm = &uac->c_prm; 539eb9fecb9SRuslan Bilovol 540eb9fecb9SRuslan Bilovol uac->c_prm.uac = uac; 541eb9fecb9SRuslan Bilovol prm->max_psize = g_audio->out_ep_maxpsize; 542eb9fecb9SRuslan Bilovol 543eb9fecb9SRuslan Bilovol prm->ureq = kcalloc(params->req_number, sizeof(struct uac_req), 544eb9fecb9SRuslan Bilovol GFP_KERNEL); 545eb9fecb9SRuslan Bilovol if (!prm->ureq) { 546eb9fecb9SRuslan Bilovol err = -ENOMEM; 547eb9fecb9SRuslan Bilovol goto fail; 548eb9fecb9SRuslan Bilovol } 549eb9fecb9SRuslan Bilovol 550eb9fecb9SRuslan Bilovol prm->rbuf = kcalloc(params->req_number, prm->max_psize, 551eb9fecb9SRuslan Bilovol GFP_KERNEL); 552eb9fecb9SRuslan Bilovol if (!prm->rbuf) { 553eb9fecb9SRuslan Bilovol prm->max_psize = 0; 554eb9fecb9SRuslan Bilovol err = -ENOMEM; 555eb9fecb9SRuslan Bilovol goto fail; 556eb9fecb9SRuslan Bilovol } 557eb9fecb9SRuslan Bilovol } 558eb9fecb9SRuslan Bilovol 559eb9fecb9SRuslan Bilovol if (p_chmask) { 560eb9fecb9SRuslan Bilovol struct uac_rtd_params *prm = &uac->p_prm; 561eb9fecb9SRuslan Bilovol 562eb9fecb9SRuslan Bilovol uac->p_prm.uac = uac; 563eb9fecb9SRuslan Bilovol prm->max_psize = g_audio->in_ep_maxpsize; 564eb9fecb9SRuslan Bilovol 565eb9fecb9SRuslan Bilovol prm->ureq = kcalloc(params->req_number, sizeof(struct uac_req), 566eb9fecb9SRuslan Bilovol GFP_KERNEL); 567eb9fecb9SRuslan Bilovol if (!prm->ureq) { 568eb9fecb9SRuslan Bilovol err = -ENOMEM; 569eb9fecb9SRuslan Bilovol goto fail; 570eb9fecb9SRuslan Bilovol } 571eb9fecb9SRuslan Bilovol 572eb9fecb9SRuslan Bilovol prm->rbuf = kcalloc(params->req_number, prm->max_psize, 573eb9fecb9SRuslan Bilovol GFP_KERNEL); 574eb9fecb9SRuslan Bilovol if (!prm->rbuf) { 575eb9fecb9SRuslan Bilovol prm->max_psize = 0; 576eb9fecb9SRuslan Bilovol err = -ENOMEM; 577eb9fecb9SRuslan Bilovol goto fail; 578eb9fecb9SRuslan Bilovol } 579eb9fecb9SRuslan Bilovol } 580eb9fecb9SRuslan Bilovol 581eb9fecb9SRuslan Bilovol /* Choose any slot, with no id */ 582eb9fecb9SRuslan Bilovol err = snd_card_new(&g_audio->gadget->dev, 583eb9fecb9SRuslan Bilovol -1, NULL, THIS_MODULE, 0, &card); 584eb9fecb9SRuslan Bilovol if (err < 0) 585eb9fecb9SRuslan Bilovol goto fail; 586eb9fecb9SRuslan Bilovol 587eb9fecb9SRuslan Bilovol uac->card = card; 588eb9fecb9SRuslan Bilovol 589eb9fecb9SRuslan Bilovol /* 590eb9fecb9SRuslan Bilovol * Create first PCM device 591eb9fecb9SRuslan Bilovol * Create a substream only for non-zero channel streams 592eb9fecb9SRuslan Bilovol */ 593eb9fecb9SRuslan Bilovol err = snd_pcm_new(uac->card, pcm_name, 0, 594eb9fecb9SRuslan Bilovol p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm); 595eb9fecb9SRuslan Bilovol if (err < 0) 596eb9fecb9SRuslan Bilovol goto snd_fail; 597eb9fecb9SRuslan Bilovol 598dfa042faSEugeniu Rosca strlcpy(pcm->name, pcm_name, sizeof(pcm->name)); 599eb9fecb9SRuslan Bilovol pcm->private_data = uac; 600eb9fecb9SRuslan Bilovol uac->pcm = pcm; 601eb9fecb9SRuslan Bilovol 602eb9fecb9SRuslan Bilovol snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac_pcm_ops); 603eb9fecb9SRuslan Bilovol snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac_pcm_ops); 604eb9fecb9SRuslan Bilovol 605dfa042faSEugeniu Rosca strlcpy(card->driver, card_name, sizeof(card->driver)); 606dfa042faSEugeniu Rosca strlcpy(card->shortname, card_name, sizeof(card->shortname)); 607eb9fecb9SRuslan Bilovol sprintf(card->longname, "%s %i", card_name, card->dev->id); 608eb9fecb9SRuslan Bilovol 609eb9fecb9SRuslan Bilovol snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, 610eb9fecb9SRuslan Bilovol snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX); 611eb9fecb9SRuslan Bilovol 612eb9fecb9SRuslan Bilovol err = snd_card_register(card); 613eb9fecb9SRuslan Bilovol 614eb9fecb9SRuslan Bilovol if (!err) 615eb9fecb9SRuslan Bilovol return 0; 616eb9fecb9SRuslan Bilovol 617eb9fecb9SRuslan Bilovol snd_fail: 618eb9fecb9SRuslan Bilovol snd_card_free(card); 619eb9fecb9SRuslan Bilovol fail: 620eb9fecb9SRuslan Bilovol kfree(uac->p_prm.ureq); 621eb9fecb9SRuslan Bilovol kfree(uac->c_prm.ureq); 622eb9fecb9SRuslan Bilovol kfree(uac->p_prm.rbuf); 623eb9fecb9SRuslan Bilovol kfree(uac->c_prm.rbuf); 624eb9fecb9SRuslan Bilovol kfree(uac); 625eb9fecb9SRuslan Bilovol 626eb9fecb9SRuslan Bilovol return err; 627eb9fecb9SRuslan Bilovol } 628eb9fecb9SRuslan Bilovol EXPORT_SYMBOL_GPL(g_audio_setup); 629eb9fecb9SRuslan Bilovol 630eb9fecb9SRuslan Bilovol void g_audio_cleanup(struct g_audio *g_audio) 631eb9fecb9SRuslan Bilovol { 632eb9fecb9SRuslan Bilovol struct snd_uac_chip *uac; 633eb9fecb9SRuslan Bilovol struct snd_card *card; 634eb9fecb9SRuslan Bilovol 635eb9fecb9SRuslan Bilovol if (!g_audio || !g_audio->uac) 636eb9fecb9SRuslan Bilovol return; 637eb9fecb9SRuslan Bilovol 638eb9fecb9SRuslan Bilovol uac = g_audio->uac; 639eb9fecb9SRuslan Bilovol card = uac->card; 640eb9fecb9SRuslan Bilovol if (card) 641eb9fecb9SRuslan Bilovol snd_card_free(card); 642eb9fecb9SRuslan Bilovol 643eb9fecb9SRuslan Bilovol kfree(uac->p_prm.ureq); 644eb9fecb9SRuslan Bilovol kfree(uac->c_prm.ureq); 645eb9fecb9SRuslan Bilovol kfree(uac->p_prm.rbuf); 646eb9fecb9SRuslan Bilovol kfree(uac->c_prm.rbuf); 647eb9fecb9SRuslan Bilovol kfree(uac); 648eb9fecb9SRuslan Bilovol } 649eb9fecb9SRuslan Bilovol EXPORT_SYMBOL_GPL(g_audio_cleanup); 650eb9fecb9SRuslan Bilovol 651eb9fecb9SRuslan Bilovol MODULE_LICENSE("GPL"); 652eb9fecb9SRuslan Bilovol MODULE_DESCRIPTION("USB gadget \"ALSA sound card\" utilities"); 653eb9fecb9SRuslan Bilovol MODULE_AUTHOR("Ruslan Bilovol"); 654