Commit | Line | Data |
---|---|---|
31ef9134 CL |
1 | /* |
2 | * Audio and Music Data Transmission Protocol (IEC 61883-6) streams | |
3 | * with Common Isochronous Packet (IEC 61883-1) headers | |
4 | * | |
5 | * Copyright (c) Clemens Ladisch <clemens@ladisch.de> | |
6 | * Licensed under the terms of the GNU General Public License, version 2. | |
7 | */ | |
8 | ||
9 | #include <linux/device.h> | |
10 | #include <linux/err.h> | |
11 | #include <linux/firewire.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
7b3b0d85 | 14 | #include <linux/sched.h> |
31ef9134 | 15 | #include <sound/pcm.h> |
7b2d99fa | 16 | #include <sound/pcm_params.h> |
83d8d72d | 17 | #include <sound/rawmidi.h> |
31ef9134 CL |
18 | #include "amdtp.h" |
19 | ||
20 | #define TICKS_PER_CYCLE 3072 | |
21 | #define CYCLES_PER_SECOND 8000 | |
22 | #define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND) | |
23 | ||
24 | #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */ | |
25 | ||
b445db44 TS |
26 | /* isochronous header parameters */ |
27 | #define ISO_DATA_LENGTH_SHIFT 16 | |
31ef9134 CL |
28 | #define TAG_CIP 1 |
29 | ||
b445db44 | 30 | /* common isochronous packet header parameters */ |
31ef9134 | 31 | #define CIP_EOH (1u << 31) |
b445db44 | 32 | #define CIP_EOH_MASK 0x80000000 |
31ef9134 | 33 | #define CIP_FMT_AM (0x10 << 24) |
b445db44 TS |
34 | #define CIP_FMT_MASK 0x3f000000 |
35 | #define CIP_SYT_MASK 0x0000ffff | |
36 | #define CIP_SYT_NO_INFO 0xffff | |
37 | #define CIP_FDF_MASK 0x00ff0000 | |
38 | #define CIP_FDF_SFC_SHIFT 16 | |
39 | ||
40 | /* | |
41 | * Audio and Music transfer protocol specific parameters | |
42 | * only "Clock-based rate control mode" is supported | |
43 | */ | |
44 | #define AMDTP_FDF_AM824 (0 << (CIP_FDF_SFC_SHIFT + 3)) | |
2b3fc456 | 45 | #define AMDTP_FDF_NO_DATA 0xff |
b445db44 TS |
46 | #define AMDTP_DBS_MASK 0x00ff0000 |
47 | #define AMDTP_DBS_SHIFT 16 | |
48 | #define AMDTP_DBC_MASK 0x000000ff | |
31ef9134 CL |
49 | |
50 | /* TODO: make these configurable */ | |
51 | #define INTERRUPT_INTERVAL 16 | |
52 | #define QUEUE_LENGTH 48 | |
53 | ||
2b3fc456 | 54 | #define IN_PACKET_HEADER_SIZE 4 |
4b7da117 TS |
55 | #define OUT_PACKET_HEADER_SIZE 0 |
56 | ||
76fb8789 CL |
57 | static void pcm_period_tasklet(unsigned long data); |
58 | ||
31ef9134 | 59 | /** |
be4a2894 TS |
60 | * amdtp_stream_init - initialize an AMDTP stream structure |
61 | * @s: the AMDTP stream to initialize | |
31ef9134 | 62 | * @unit: the target of the stream |
3ff7e8f0 | 63 | * @dir: the direction of stream |
31ef9134 CL |
64 | * @flags: the packet transmission method to use |
65 | */ | |
be4a2894 | 66 | int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
3ff7e8f0 | 67 | enum amdtp_stream_direction dir, enum cip_flags flags) |
31ef9134 | 68 | { |
31ef9134 | 69 | s->unit = fw_unit_get(unit); |
3ff7e8f0 | 70 | s->direction = dir; |
31ef9134 CL |
71 | s->flags = flags; |
72 | s->context = ERR_PTR(-1); | |
73 | mutex_init(&s->mutex); | |
76fb8789 | 74 | tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); |
ec00f5e4 | 75 | s->packet_index = 0; |
31ef9134 | 76 | |
7b3b0d85 TS |
77 | init_waitqueue_head(&s->callback_wait); |
78 | s->callbacked = false; | |
79 | s->sync_slave = NULL; | |
80 | ||
31ef9134 CL |
81 | return 0; |
82 | } | |
be4a2894 | 83 | EXPORT_SYMBOL(amdtp_stream_init); |
31ef9134 CL |
84 | |
85 | /** | |
be4a2894 TS |
86 | * amdtp_stream_destroy - free stream resources |
87 | * @s: the AMDTP stream to destroy | |
31ef9134 | 88 | */ |
be4a2894 | 89 | void amdtp_stream_destroy(struct amdtp_stream *s) |
31ef9134 | 90 | { |
be4a2894 | 91 | WARN_ON(amdtp_stream_running(s)); |
31ef9134 CL |
92 | mutex_destroy(&s->mutex); |
93 | fw_unit_put(s->unit); | |
94 | } | |
be4a2894 | 95 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 96 | |
c5280e99 | 97 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
98 | [CIP_SFC_32000] = 8, |
99 | [CIP_SFC_44100] = 8, | |
100 | [CIP_SFC_48000] = 8, | |
101 | [CIP_SFC_88200] = 16, | |
102 | [CIP_SFC_96000] = 16, | |
103 | [CIP_SFC_176400] = 32, | |
104 | [CIP_SFC_192000] = 32, | |
105 | }; | |
106 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
107 | ||
1017abed TS |
108 | const unsigned int amdtp_rate_table[] = { |
109 | [CIP_SFC_32000] = 32000, | |
110 | [CIP_SFC_44100] = 44100, | |
111 | [CIP_SFC_48000] = 48000, | |
112 | [CIP_SFC_88200] = 88200, | |
113 | [CIP_SFC_96000] = 96000, | |
114 | [CIP_SFC_176400] = 176400, | |
115 | [CIP_SFC_192000] = 192000, | |
116 | }; | |
117 | EXPORT_SYMBOL(amdtp_rate_table); | |
118 | ||
7b2d99fa TS |
119 | /** |
120 | * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream | |
121 | * @s: the AMDTP stream, which must be initialized. | |
122 | * @runtime: the PCM substream runtime | |
123 | */ | |
124 | int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, | |
125 | struct snd_pcm_runtime *runtime) | |
126 | { | |
127 | int err; | |
128 | ||
129 | /* AM824 in IEC 61883-6 can deliver 24bit data */ | |
130 | err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24); | |
131 | if (err < 0) | |
132 | goto end; | |
133 | ||
134 | /* | |
135 | * Currently firewire-lib processes 16 packets in one software | |
136 | * interrupt callback. This equals to 2msec but actually the | |
137 | * interval of the interrupts has a jitter. | |
138 | * Additionally, even if adding a constraint to fit period size to | |
139 | * 2msec, actual calculated frames per period doesn't equal to 2msec, | |
140 | * depending on sampling rate. | |
141 | * Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec. | |
142 | * Here let us use 5msec for safe period interrupt. | |
143 | */ | |
144 | err = snd_pcm_hw_constraint_minmax(runtime, | |
145 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, | |
146 | 5000, UINT_MAX); | |
147 | if (err < 0) | |
148 | goto end; | |
149 | ||
150 | /* Non-Blocking stream has no more constraints */ | |
151 | if (!(s->flags & CIP_BLOCKING)) | |
152 | goto end; | |
153 | ||
154 | /* | |
155 | * One AMDTP packet can include some frames. In blocking mode, the | |
156 | * number equals to SYT_INTERVAL. So the number is 8, 16 or 32, | |
157 | * depending on its sampling rate. For accurate period interrupt, it's | |
158 | * preferrable to aligh period/buffer sizes to current SYT_INTERVAL. | |
159 | * | |
160 | * TODO: These constraints can be improved with propper rules. | |
161 | * Currently apply LCM of SYT_INTEVALs. | |
162 | */ | |
163 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
164 | SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 32); | |
165 | if (err < 0) | |
166 | goto end; | |
167 | err = snd_pcm_hw_constraint_step(runtime, 0, | |
168 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32); | |
169 | end: | |
170 | return err; | |
171 | } | |
172 | EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints); | |
173 | ||
31ef9134 | 174 | /** |
be4a2894 TS |
175 | * amdtp_stream_set_parameters - set stream parameters |
176 | * @s: the AMDTP stream to configure | |
31ef9134 | 177 | * @rate: the sample rate |
a7304e3b CL |
178 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
179 | * as AM824 multi-bit linear audio | |
180 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) | |
31ef9134 | 181 | * |
a7304e3b | 182 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
183 | * changed while the stream is running. |
184 | */ | |
be4a2894 TS |
185 | void amdtp_stream_set_parameters(struct amdtp_stream *s, |
186 | unsigned int rate, | |
187 | unsigned int pcm_channels, | |
188 | unsigned int midi_ports) | |
31ef9134 | 189 | { |
77d2a8a4 | 190 | unsigned int i, sfc, midi_channels; |
31ef9134 | 191 | |
83d8d72d TS |
192 | midi_channels = DIV_ROUND_UP(midi_ports, 8); |
193 | ||
77d2a8a4 TS |
194 | if (WARN_ON(amdtp_stream_running(s)) | |
195 | WARN_ON(pcm_channels > AMDTP_MAX_CHANNELS_FOR_PCM) | | |
83d8d72d | 196 | WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI)) |
31ef9134 CL |
197 | return; |
198 | ||
1017abed TS |
199 | for (sfc = 0; sfc < sizeof(amdtp_rate_table); ++sfc) |
200 | if (amdtp_rate_table[sfc] == rate) | |
e84d15f6 | 201 | goto sfc_found; |
31ef9134 | 202 | WARN_ON(1); |
e84d15f6 CL |
203 | return; |
204 | ||
205 | sfc_found: | |
10550bea | 206 | s->pcm_channels = pcm_channels; |
e84d15f6 | 207 | s->sfc = sfc; |
77d2a8a4 | 208 | s->data_block_quadlets = s->pcm_channels + midi_channels; |
a7304e3b CL |
209 | s->midi_ports = midi_ports; |
210 | ||
211 | s->syt_interval = amdtp_syt_intervals[sfc]; | |
e84d15f6 CL |
212 | |
213 | /* default buffering in the device */ | |
214 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
215 | if (s->flags & CIP_BLOCKING) | |
216 | /* additional buffering needed to adjust for no-data packets */ | |
217 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
77d2a8a4 TS |
218 | |
219 | /* init the position map for PCM and MIDI channels */ | |
220 | for (i = 0; i < pcm_channels; i++) | |
221 | s->pcm_positions[i] = i; | |
222 | s->midi_position = s->pcm_channels; | |
31ef9134 | 223 | } |
be4a2894 | 224 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
225 | |
226 | /** | |
be4a2894 TS |
227 | * amdtp_stream_get_max_payload - get the stream's packet size |
228 | * @s: the AMDTP stream | |
31ef9134 CL |
229 | * |
230 | * This function must not be called before the stream has been configured | |
be4a2894 | 231 | * with amdtp_stream_set_parameters(). |
31ef9134 | 232 | */ |
be4a2894 | 233 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 234 | { |
e84d15f6 | 235 | return 8 + s->syt_interval * s->data_block_quadlets * 4; |
31ef9134 | 236 | } |
be4a2894 | 237 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 238 | |
be4a2894 | 239 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
240 | struct snd_pcm_substream *pcm, |
241 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 242 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
243 | struct snd_pcm_substream *pcm, |
244 | __be32 *buffer, unsigned int frames); | |
2b3fc456 TS |
245 | static void amdtp_read_s32(struct amdtp_stream *s, |
246 | struct snd_pcm_substream *pcm, | |
247 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
248 | |
249 | /** | |
be4a2894 TS |
250 | * amdtp_stream_set_pcm_format - set the PCM format |
251 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
252 | * @format: the format of the ALSA PCM device |
253 | * | |
a7304e3b CL |
254 | * The sample format must be set after the other paramters (rate/PCM channels/ |
255 | * MIDI) and before the stream is started, and must not be changed while the | |
256 | * stream is running. | |
31ef9134 | 257 | */ |
be4a2894 TS |
258 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
259 | snd_pcm_format_t format) | |
31ef9134 | 260 | { |
83d8d72d | 261 | if (WARN_ON(amdtp_stream_pcm_running(s))) |
31ef9134 CL |
262 | return; |
263 | ||
264 | switch (format) { | |
265 | default: | |
266 | WARN_ON(1); | |
267 | /* fall through */ | |
268 | case SNDRV_PCM_FORMAT_S16: | |
2b3fc456 | 269 | if (s->direction == AMDTP_OUT_STREAM) { |
10550bea | 270 | s->transfer_samples = amdtp_write_s16; |
2b3fc456 TS |
271 | break; |
272 | } | |
273 | WARN_ON(1); | |
274 | /* fall through */ | |
31ef9134 | 275 | case SNDRV_PCM_FORMAT_S32: |
10550bea TS |
276 | if (s->direction == AMDTP_OUT_STREAM) |
277 | s->transfer_samples = amdtp_write_s32; | |
278 | else | |
279 | s->transfer_samples = amdtp_read_s32; | |
31ef9134 CL |
280 | break; |
281 | } | |
282 | } | |
be4a2894 | 283 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 284 | |
76fb8789 | 285 | /** |
be4a2894 TS |
286 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
287 | * @s: the AMDTP stream | |
76fb8789 CL |
288 | * |
289 | * This function should be called from the PCM device's .prepare callback. | |
290 | */ | |
be4a2894 | 291 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
292 | { |
293 | tasklet_kill(&s->period_tasklet); | |
294 | s->pcm_buffer_pointer = 0; | |
295 | s->pcm_period_pointer = 0; | |
92b862c7 | 296 | s->pointer_flush = true; |
76fb8789 | 297 | } |
be4a2894 | 298 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 299 | |
be4a2894 | 300 | static unsigned int calculate_data_blocks(struct amdtp_stream *s) |
31ef9134 CL |
301 | { |
302 | unsigned int phase, data_blocks; | |
303 | ||
ccccad86 TS |
304 | if (s->flags & CIP_BLOCKING) |
305 | data_blocks = s->syt_interval; | |
306 | else if (!cip_sfc_is_base_44100(s->sfc)) { | |
31ef9134 CL |
307 | /* Sample_rate / 8000 is an integer, and precomputed. */ |
308 | data_blocks = s->data_block_state; | |
309 | } else { | |
310 | phase = s->data_block_state; | |
311 | ||
312 | /* | |
313 | * This calculates the number of data blocks per packet so that | |
314 | * 1) the overall rate is correct and exactly synchronized to | |
315 | * the bus clock, and | |
316 | * 2) packets with a rounded-up number of blocks occur as early | |
317 | * as possible in the sequence (to prevent underruns of the | |
318 | * device's buffer). | |
319 | */ | |
320 | if (s->sfc == CIP_SFC_44100) | |
321 | /* 6 6 5 6 5 6 5 ... */ | |
322 | data_blocks = 5 + ((phase & 1) ^ | |
323 | (phase == 0 || phase >= 40)); | |
324 | else | |
325 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
326 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
327 | if (++phase >= (80 >> (s->sfc >> 1))) | |
328 | phase = 0; | |
329 | s->data_block_state = phase; | |
330 | } | |
331 | ||
332 | return data_blocks; | |
333 | } | |
334 | ||
be4a2894 | 335 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
336 | unsigned int cycle) |
337 | { | |
338 | unsigned int syt_offset, phase, index, syt; | |
339 | ||
340 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
341 | if (!cip_sfc_is_base_44100(s->sfc)) | |
342 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
343 | else { | |
344 | /* | |
345 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
346 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
347 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
348 | * elements is about 1386.23. Rounding the results of this | |
349 | * formula to the SYT precision results in a sequence of | |
350 | * differences that begins with: | |
351 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
352 | * This code generates _exactly_ the same sequence. | |
353 | */ | |
354 | phase = s->syt_offset_state; | |
355 | index = phase % 13; | |
356 | syt_offset = s->last_syt_offset; | |
357 | syt_offset += 1386 + ((index && !(index & 3)) || | |
358 | phase == 146); | |
359 | if (++phase >= 147) | |
360 | phase = 0; | |
361 | s->syt_offset_state = phase; | |
362 | } | |
363 | } else | |
364 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
365 | s->last_syt_offset = syt_offset; | |
366 | ||
be454366 | 367 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 368 | syt_offset += s->transfer_delay; |
be454366 CL |
369 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
370 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 371 | |
b445db44 | 372 | return syt & CIP_SYT_MASK; |
be454366 | 373 | } else { |
b445db44 | 374 | return CIP_SYT_NO_INFO; |
be454366 | 375 | } |
31ef9134 CL |
376 | } |
377 | ||
be4a2894 | 378 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
379 | struct snd_pcm_substream *pcm, |
380 | __be32 *buffer, unsigned int frames) | |
381 | { | |
382 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 383 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
384 | const u32 *src; |
385 | ||
386 | channels = s->pcm_channels; | |
387 | src = (void *)runtime->dma_area + | |
e84841f9 | 388 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 389 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
390 | |
391 | for (i = 0; i < frames; ++i) { | |
392 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 TS |
393 | buffer[s->pcm_positions[c]] = |
394 | cpu_to_be32((*src >> 8) | 0x40000000); | |
31ef9134 | 395 | src++; |
31ef9134 | 396 | } |
77d2a8a4 | 397 | buffer += s->data_block_quadlets; |
31ef9134 CL |
398 | if (--remaining_frames == 0) |
399 | src = (void *)runtime->dma_area; | |
400 | } | |
401 | } | |
402 | ||
be4a2894 | 403 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
404 | struct snd_pcm_substream *pcm, |
405 | __be32 *buffer, unsigned int frames) | |
406 | { | |
407 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 408 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
409 | const u16 *src; |
410 | ||
411 | channels = s->pcm_channels; | |
412 | src = (void *)runtime->dma_area + | |
e84841f9 | 413 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 414 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
415 | |
416 | for (i = 0; i < frames; ++i) { | |
417 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 TS |
418 | buffer[s->pcm_positions[c]] = |
419 | cpu_to_be32((*src << 8) | 0x40000000); | |
31ef9134 | 420 | src++; |
31ef9134 | 421 | } |
77d2a8a4 | 422 | buffer += s->data_block_quadlets; |
31ef9134 CL |
423 | if (--remaining_frames == 0) |
424 | src = (void *)runtime->dma_area; | |
425 | } | |
426 | } | |
427 | ||
2b3fc456 TS |
428 | static void amdtp_read_s32(struct amdtp_stream *s, |
429 | struct snd_pcm_substream *pcm, | |
430 | __be32 *buffer, unsigned int frames) | |
431 | { | |
432 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
433 | unsigned int channels, remaining_frames, i, c; | |
434 | u32 *dst; | |
435 | ||
436 | channels = s->pcm_channels; | |
437 | dst = (void *)runtime->dma_area + | |
438 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
439 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
440 | ||
441 | for (i = 0; i < frames; ++i) { | |
442 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 443 | *dst = be32_to_cpu(buffer[s->pcm_positions[c]]) << 8; |
2b3fc456 TS |
444 | dst++; |
445 | } | |
446 | buffer += s->data_block_quadlets; | |
447 | if (--remaining_frames == 0) | |
448 | dst = (void *)runtime->dma_area; | |
449 | } | |
450 | } | |
451 | ||
be4a2894 | 452 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
453 | __be32 *buffer, unsigned int frames) |
454 | { | |
455 | unsigned int i, c; | |
456 | ||
457 | for (i = 0; i < frames; ++i) { | |
458 | for (c = 0; c < s->pcm_channels; ++c) | |
77d2a8a4 | 459 | buffer[s->pcm_positions[c]] = cpu_to_be32(0x40000000); |
31ef9134 CL |
460 | buffer += s->data_block_quadlets; |
461 | } | |
462 | } | |
463 | ||
be4a2894 | 464 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
465 | __be32 *buffer, unsigned int frames) |
466 | { | |
83d8d72d TS |
467 | unsigned int f, port; |
468 | u8 *b; | |
469 | ||
470 | for (f = 0; f < frames; f++) { | |
77d2a8a4 TS |
471 | buffer[s->midi_position] = 0; |
472 | b = (u8 *)&buffer[s->midi_position]; | |
83d8d72d TS |
473 | |
474 | port = (s->data_block_counter + f) % 8; | |
475 | if ((s->midi[port] == NULL) || | |
476 | (snd_rawmidi_transmit(s->midi[port], b + 1, 1) <= 0)) | |
477 | b[0] = 0x80; | |
478 | else | |
479 | b[0] = 0x81; | |
480 | ||
481 | buffer += s->data_block_quadlets; | |
482 | } | |
483 | } | |
484 | ||
485 | static void amdtp_pull_midi(struct amdtp_stream *s, | |
486 | __be32 *buffer, unsigned int frames) | |
487 | { | |
488 | unsigned int f, port; | |
489 | int len; | |
490 | u8 *b; | |
491 | ||
492 | for (f = 0; f < frames; f++) { | |
493 | port = (s->data_block_counter + f) % 8; | |
77d2a8a4 | 494 | b = (u8 *)&buffer[s->midi_position]; |
31ef9134 | 495 | |
83d8d72d TS |
496 | len = b[0] - 0x80; |
497 | if ((1 <= len) && (len <= 3) && (s->midi[port])) | |
498 | snd_rawmidi_receive(s->midi[port], b + 1, len); | |
499 | ||
500 | buffer += s->data_block_quadlets; | |
501 | } | |
31ef9134 CL |
502 | } |
503 | ||
4b7da117 TS |
504 | static void update_pcm_pointers(struct amdtp_stream *s, |
505 | struct snd_pcm_substream *pcm, | |
506 | unsigned int frames) | |
507 | { unsigned int ptr; | |
508 | ||
4b7da117 TS |
509 | ptr = s->pcm_buffer_pointer + frames; |
510 | if (ptr >= pcm->runtime->buffer_size) | |
511 | ptr -= pcm->runtime->buffer_size; | |
512 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
513 | ||
514 | s->pcm_period_pointer += frames; | |
515 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
516 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
517 | s->pointer_flush = false; | |
518 | tasklet_hi_schedule(&s->period_tasklet); | |
519 | } | |
520 | } | |
521 | ||
522 | static void pcm_period_tasklet(unsigned long data) | |
523 | { | |
524 | struct amdtp_stream *s = (void *)data; | |
525 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); | |
526 | ||
527 | if (pcm) | |
528 | snd_pcm_period_elapsed(pcm); | |
529 | } | |
530 | ||
531 | static int queue_packet(struct amdtp_stream *s, | |
532 | unsigned int header_length, | |
533 | unsigned int payload_length, bool skip) | |
534 | { | |
535 | struct fw_iso_packet p = {0}; | |
7b3b0d85 TS |
536 | int err = 0; |
537 | ||
538 | if (IS_ERR(s->context)) | |
539 | goto end; | |
4b7da117 TS |
540 | |
541 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
542 | p.tag = TAG_CIP; | |
543 | p.header_length = header_length; | |
544 | p.payload_length = (!skip) ? payload_length : 0; | |
545 | p.skip = skip; | |
546 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, | |
547 | s->buffer.packets[s->packet_index].offset); | |
548 | if (err < 0) { | |
549 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
550 | goto end; | |
551 | } | |
552 | ||
553 | if (++s->packet_index >= QUEUE_LENGTH) | |
554 | s->packet_index = 0; | |
555 | end: | |
556 | return err; | |
557 | } | |
558 | ||
559 | static inline int queue_out_packet(struct amdtp_stream *s, | |
560 | unsigned int payload_length, bool skip) | |
561 | { | |
562 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, | |
563 | payload_length, skip); | |
564 | } | |
565 | ||
2b3fc456 TS |
566 | static inline int queue_in_packet(struct amdtp_stream *s) |
567 | { | |
568 | return queue_packet(s, IN_PACKET_HEADER_SIZE, | |
569 | amdtp_stream_get_max_payload(s), false); | |
570 | } | |
571 | ||
ccccad86 | 572 | static void handle_out_packet(struct amdtp_stream *s, unsigned int syt) |
31ef9134 CL |
573 | { |
574 | __be32 *buffer; | |
ccccad86 | 575 | unsigned int data_blocks, payload_length; |
31ef9134 | 576 | struct snd_pcm_substream *pcm; |
31ef9134 | 577 | |
ec00f5e4 CL |
578 | if (s->packet_index < 0) |
579 | return; | |
ec00f5e4 | 580 | |
82755abf | 581 | /* this module generate empty packet for 'no data' */ |
ccccad86 | 582 | if (!(s->flags & CIP_BLOCKING) || (syt != CIP_SYT_NO_INFO)) |
e84d15f6 | 583 | data_blocks = calculate_data_blocks(s); |
82755abf TS |
584 | else |
585 | data_blocks = 0; | |
31ef9134 | 586 | |
ccccad86 | 587 | buffer = s->buffer.packets[s->packet_index].buffer; |
31ef9134 | 588 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
b445db44 | 589 | (s->data_block_quadlets << AMDTP_DBS_SHIFT) | |
31ef9134 CL |
590 | s->data_block_counter); |
591 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
b445db44 | 592 | (s->sfc << CIP_FDF_SFC_SHIFT) | syt); |
31ef9134 CL |
593 | buffer += 2; |
594 | ||
595 | pcm = ACCESS_ONCE(s->pcm); | |
596 | if (pcm) | |
597 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
598 | else | |
599 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
600 | if (s->midi_ports) | |
601 | amdtp_fill_midi(s, buffer, data_blocks); | |
602 | ||
603 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
604 | ||
4b7da117 TS |
605 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
606 | if (queue_out_packet(s, payload_length, false) < 0) { | |
ec00f5e4 | 607 | s->packet_index = -1; |
be4a2894 | 608 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
609 | return; |
610 | } | |
31ef9134 | 611 | |
76fb8789 | 612 | if (pcm) |
4b7da117 | 613 | update_pcm_pointers(s, pcm, data_blocks); |
76fb8789 CL |
614 | } |
615 | ||
2b3fc456 TS |
616 | static void handle_in_packet(struct amdtp_stream *s, |
617 | unsigned int payload_quadlets, | |
618 | __be32 *buffer) | |
619 | { | |
620 | u32 cip_header[2]; | |
621 | unsigned int data_blocks, data_block_quadlets, data_block_counter; | |
622 | struct snd_pcm_substream *pcm = NULL; | |
c8bdf49b | 623 | bool lost; |
2b3fc456 TS |
624 | |
625 | cip_header[0] = be32_to_cpu(buffer[0]); | |
626 | cip_header[1] = be32_to_cpu(buffer[1]); | |
627 | ||
628 | /* | |
629 | * This module supports 'Two-quadlet CIP header with SYT field'. | |
77d2a8a4 | 630 | * For convenience, also check FMT field is AM824 or not. |
2b3fc456 TS |
631 | */ |
632 | if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || | |
633 | ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) || | |
634 | ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) { | |
635 | dev_info_ratelimited(&s->unit->device, | |
636 | "Invalid CIP header for AMDTP: %08X:%08X\n", | |
637 | cip_header[0], cip_header[1]); | |
638 | goto end; | |
639 | } | |
640 | ||
641 | /* Calculate data blocks */ | |
642 | if (payload_quadlets < 3 || | |
643 | ((cip_header[1] & CIP_FDF_MASK) == | |
644 | (AMDTP_FDF_NO_DATA << CIP_FDF_SFC_SHIFT))) { | |
645 | data_blocks = 0; | |
646 | } else { | |
647 | data_block_quadlets = | |
648 | (cip_header[0] & AMDTP_DBS_MASK) >> AMDTP_DBS_SHIFT; | |
649 | /* avoid division by zero */ | |
650 | if (data_block_quadlets == 0) { | |
651 | dev_info_ratelimited(&s->unit->device, | |
652 | "Detect invalid value in dbs field: %08X\n", | |
653 | cip_header[0]); | |
654 | goto err; | |
655 | } | |
656 | ||
657 | data_blocks = (payload_quadlets - 2) / data_block_quadlets; | |
658 | } | |
659 | ||
660 | /* Check data block counter continuity */ | |
661 | data_block_counter = cip_header[0] & AMDTP_DBC_MASK; | |
c8bdf49b TS |
662 | if (!(s->flags & CIP_DBC_IS_END_EVENT)) |
663 | lost = data_block_counter != s->data_block_counter; | |
664 | else | |
665 | lost = data_block_counter != | |
666 | ((s->data_block_counter + data_blocks) & 0xff); | |
667 | ||
668 | if (lost) { | |
2b3fc456 TS |
669 | dev_info(&s->unit->device, |
670 | "Detect discontinuity of CIP: %02X %02X\n", | |
671 | s->data_block_counter, data_block_counter); | |
672 | goto err; | |
673 | } | |
674 | ||
675 | if (data_blocks > 0) { | |
676 | buffer += 2; | |
677 | ||
678 | pcm = ACCESS_ONCE(s->pcm); | |
679 | if (pcm) | |
680 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
83d8d72d TS |
681 | |
682 | if (s->midi_ports) | |
683 | amdtp_pull_midi(s, buffer, data_blocks); | |
2b3fc456 TS |
684 | } |
685 | ||
c8bdf49b TS |
686 | if (s->flags & CIP_DBC_IS_END_EVENT) |
687 | s->data_block_counter = data_block_counter; | |
688 | else | |
689 | s->data_block_counter = | |
690 | (data_block_counter + data_blocks) & 0xff; | |
2b3fc456 TS |
691 | end: |
692 | if (queue_in_packet(s) < 0) | |
693 | goto err; | |
694 | ||
695 | if (pcm) | |
696 | update_pcm_pointers(s, pcm, data_blocks); | |
697 | ||
698 | return; | |
699 | err: | |
700 | s->packet_index = -1; | |
701 | amdtp_stream_pcm_abort(s); | |
702 | } | |
703 | ||
4b7da117 TS |
704 | static void out_stream_callback(struct fw_iso_context *context, u32 cycle, |
705 | size_t header_length, void *header, | |
706 | void *private_data) | |
31ef9134 | 707 | { |
be4a2894 | 708 | struct amdtp_stream *s = private_data; |
ccccad86 | 709 | unsigned int i, syt, packets = header_length / 4; |
31ef9134 CL |
710 | |
711 | /* | |
712 | * Compute the cycle of the last queued packet. | |
713 | * (We need only the four lowest bits for the SYT, so we can ignore | |
714 | * that bits 0-11 must wrap around at 3072.) | |
715 | */ | |
716 | cycle += QUEUE_LENGTH - packets; | |
717 | ||
ccccad86 TS |
718 | for (i = 0; i < packets; ++i) { |
719 | syt = calculate_syt(s, ++cycle); | |
720 | handle_out_packet(s, syt); | |
721 | } | |
13882a82 | 722 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
723 | } |
724 | ||
2b3fc456 TS |
725 | static void in_stream_callback(struct fw_iso_context *context, u32 cycle, |
726 | size_t header_length, void *header, | |
727 | void *private_data) | |
728 | { | |
729 | struct amdtp_stream *s = private_data; | |
7b3b0d85 | 730 | unsigned int p, syt, packets, payload_quadlets; |
2b3fc456 TS |
731 | __be32 *buffer, *headers = header; |
732 | ||
733 | /* The number of packets in buffer */ | |
734 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
735 | ||
736 | for (p = 0; p < packets; p++) { | |
737 | if (s->packet_index < 0) | |
7b3b0d85 TS |
738 | break; |
739 | ||
2b3fc456 TS |
740 | buffer = s->buffer.packets[s->packet_index].buffer; |
741 | ||
7b3b0d85 TS |
742 | /* Process sync slave stream */ |
743 | if (s->sync_slave && s->sync_slave->callbacked) { | |
744 | syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK; | |
745 | handle_out_packet(s->sync_slave, syt); | |
746 | } | |
747 | ||
2b3fc456 TS |
748 | /* The number of quadlets in this packet */ |
749 | payload_quadlets = | |
750 | (be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4; | |
751 | handle_in_packet(s, payload_quadlets, buffer); | |
752 | } | |
753 | ||
7b3b0d85 TS |
754 | /* Queueing error or detecting discontinuity */ |
755 | if (s->packet_index < 0) { | |
756 | /* Abort sync slave. */ | |
757 | if (s->sync_slave) { | |
758 | s->sync_slave->packet_index = -1; | |
759 | amdtp_stream_pcm_abort(s->sync_slave); | |
760 | } | |
761 | return; | |
762 | } | |
763 | ||
764 | /* when sync to device, flush the packets for slave stream */ | |
765 | if (s->sync_slave && s->sync_slave->callbacked) | |
766 | fw_iso_context_queue_flush(s->sync_slave->context); | |
767 | ||
2b3fc456 TS |
768 | fw_iso_context_queue_flush(s->context); |
769 | } | |
770 | ||
7b3b0d85 TS |
771 | /* processing is done by master callback */ |
772 | static void slave_stream_callback(struct fw_iso_context *context, u32 cycle, | |
773 | size_t header_length, void *header, | |
774 | void *private_data) | |
775 | { | |
776 | return; | |
777 | } | |
778 | ||
779 | /* this is executed one time */ | |
780 | static void amdtp_stream_first_callback(struct fw_iso_context *context, | |
781 | u32 cycle, size_t header_length, | |
782 | void *header, void *private_data) | |
783 | { | |
784 | struct amdtp_stream *s = private_data; | |
785 | ||
786 | /* | |
787 | * For in-stream, first packet has come. | |
788 | * For out-stream, prepared to transmit first packet | |
789 | */ | |
790 | s->callbacked = true; | |
791 | wake_up(&s->callback_wait); | |
792 | ||
793 | if (s->direction == AMDTP_IN_STREAM) | |
794 | context->callback.sc = in_stream_callback; | |
795 | else if ((s->flags & CIP_BLOCKING) && (s->flags & CIP_SYNC_TO_DEVICE)) | |
796 | context->callback.sc = slave_stream_callback; | |
797 | else | |
798 | context->callback.sc = out_stream_callback; | |
799 | ||
800 | context->callback.sc(context, cycle, header_length, header, s); | |
801 | } | |
802 | ||
31ef9134 | 803 | /** |
be4a2894 TS |
804 | * amdtp_stream_start - start transferring packets |
805 | * @s: the AMDTP stream to start | |
31ef9134 CL |
806 | * @channel: the isochronous channel on the bus |
807 | * @speed: firewire speed code | |
808 | * | |
809 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
810 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
811 | * device can be started. | |
31ef9134 | 812 | */ |
be4a2894 | 813 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
814 | { |
815 | static const struct { | |
816 | unsigned int data_block; | |
817 | unsigned int syt_offset; | |
818 | } initial_state[] = { | |
819 | [CIP_SFC_32000] = { 4, 3072 }, | |
820 | [CIP_SFC_48000] = { 6, 1024 }, | |
821 | [CIP_SFC_96000] = { 12, 1024 }, | |
822 | [CIP_SFC_192000] = { 24, 1024 }, | |
823 | [CIP_SFC_44100] = { 0, 67 }, | |
824 | [CIP_SFC_88200] = { 0, 67 }, | |
825 | [CIP_SFC_176400] = { 0, 67 }, | |
826 | }; | |
2b3fc456 TS |
827 | unsigned int header_size; |
828 | enum dma_data_direction dir; | |
7ab56645 | 829 | int type, tag, err; |
31ef9134 CL |
830 | |
831 | mutex_lock(&s->mutex); | |
832 | ||
be4a2894 | 833 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 834 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
835 | err = -EBADFD; |
836 | goto err_unlock; | |
837 | } | |
838 | ||
4b7da117 | 839 | s->data_block_counter = 0; |
31ef9134 CL |
840 | s->data_block_state = initial_state[s->sfc].data_block; |
841 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
842 | s->last_syt_offset = TICKS_PER_CYCLE; | |
843 | ||
2b3fc456 TS |
844 | /* initialize packet buffer */ |
845 | if (s->direction == AMDTP_IN_STREAM) { | |
846 | dir = DMA_FROM_DEVICE; | |
847 | type = FW_ISO_CONTEXT_RECEIVE; | |
848 | header_size = IN_PACKET_HEADER_SIZE; | |
2b3fc456 TS |
849 | } else { |
850 | dir = DMA_TO_DEVICE; | |
851 | type = FW_ISO_CONTEXT_TRANSMIT; | |
852 | header_size = OUT_PACKET_HEADER_SIZE; | |
2b3fc456 | 853 | } |
31ef9134 | 854 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, |
2b3fc456 | 855 | amdtp_stream_get_max_payload(s), dir); |
31ef9134 CL |
856 | if (err < 0) |
857 | goto err_unlock; | |
858 | ||
859 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
2b3fc456 | 860 | type, channel, speed, header_size, |
7b3b0d85 | 861 | amdtp_stream_first_callback, s); |
31ef9134 CL |
862 | if (IS_ERR(s->context)) { |
863 | err = PTR_ERR(s->context); | |
864 | if (err == -EBUSY) | |
865 | dev_err(&s->unit->device, | |
be4a2894 | 866 | "no free stream on this controller\n"); |
31ef9134 CL |
867 | goto err_buffer; |
868 | } | |
869 | ||
be4a2894 | 870 | amdtp_stream_update(s); |
31ef9134 | 871 | |
ec00f5e4 | 872 | s->packet_index = 0; |
4b7da117 | 873 | do { |
2b3fc456 TS |
874 | if (s->direction == AMDTP_IN_STREAM) |
875 | err = queue_in_packet(s); | |
876 | else | |
877 | err = queue_out_packet(s, 0, true); | |
4b7da117 TS |
878 | if (err < 0) |
879 | goto err_context; | |
880 | } while (s->packet_index > 0); | |
31ef9134 | 881 | |
2b3fc456 | 882 | /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
7ab56645 TS |
883 | tag = FW_ISO_CONTEXT_MATCH_TAG1; |
884 | if (s->flags & CIP_EMPTY_WITH_TAG0) | |
885 | tag |= FW_ISO_CONTEXT_MATCH_TAG0; | |
886 | ||
7b3b0d85 | 887 | s->callbacked = false; |
7ab56645 | 888 | err = fw_iso_context_start(s->context, -1, 0, tag); |
31ef9134 CL |
889 | if (err < 0) |
890 | goto err_context; | |
891 | ||
892 | mutex_unlock(&s->mutex); | |
893 | ||
894 | return 0; | |
895 | ||
896 | err_context: | |
897 | fw_iso_context_destroy(s->context); | |
898 | s->context = ERR_PTR(-1); | |
899 | err_buffer: | |
900 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
901 | err_unlock: | |
902 | mutex_unlock(&s->mutex); | |
903 | ||
904 | return err; | |
905 | } | |
be4a2894 | 906 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 907 | |
e9148ddd | 908 | /** |
be4a2894 TS |
909 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
910 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
911 | * |
912 | * Returns the current buffer position, in frames. | |
913 | */ | |
be4a2894 | 914 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 915 | { |
92b862c7 | 916 | /* this optimization is allowed to be racy */ |
c8de6dbb | 917 | if (s->pointer_flush && amdtp_stream_running(s)) |
92b862c7 CL |
918 | fw_iso_context_flush_completions(s->context); |
919 | else | |
920 | s->pointer_flush = true; | |
e9148ddd CL |
921 | |
922 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
923 | } | |
be4a2894 | 924 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 925 | |
31ef9134 | 926 | /** |
be4a2894 TS |
927 | * amdtp_stream_update - update the stream after a bus reset |
928 | * @s: the AMDTP stream | |
31ef9134 | 929 | */ |
be4a2894 | 930 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
931 | { |
932 | ACCESS_ONCE(s->source_node_id_field) = | |
933 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
934 | } | |
be4a2894 | 935 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
936 | |
937 | /** | |
be4a2894 TS |
938 | * amdtp_stream_stop - stop sending packets |
939 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
940 | * |
941 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
942 | * itself can be stopped. | |
943 | */ | |
be4a2894 | 944 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
945 | { |
946 | mutex_lock(&s->mutex); | |
947 | ||
be4a2894 | 948 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
949 | mutex_unlock(&s->mutex); |
950 | return; | |
951 | } | |
952 | ||
76fb8789 | 953 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
954 | fw_iso_context_stop(s->context); |
955 | fw_iso_context_destroy(s->context); | |
956 | s->context = ERR_PTR(-1); | |
957 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
958 | ||
7b3b0d85 TS |
959 | s->callbacked = false; |
960 | ||
31ef9134 CL |
961 | mutex_unlock(&s->mutex); |
962 | } | |
be4a2894 | 963 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
964 | |
965 | /** | |
be4a2894 | 966 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
967 | * @s: the AMDTP stream about to be stopped |
968 | * | |
969 | * If the isochronous stream needs to be stopped asynchronously, call this | |
970 | * function first to stop the PCM device. | |
971 | */ | |
be4a2894 | 972 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
973 | { |
974 | struct snd_pcm_substream *pcm; | |
975 | ||
976 | pcm = ACCESS_ONCE(s->pcm); | |
977 | if (pcm) { | |
978 | snd_pcm_stream_lock_irq(pcm); | |
979 | if (snd_pcm_running(pcm)) | |
980 | snd_pcm_stop(pcm, SNDRV_PCM_STATE_XRUN); | |
981 | snd_pcm_stream_unlock_irq(pcm); | |
982 | } | |
983 | } | |
be4a2894 | 984 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |