1/*
2 * bebob_pcm.c - a part of driver for BeBoB based devices
3 *
4 * Copyright (c) 2013-2014 Takashi Sakamoto
5 *
6 * Licensed under the terms of the GNU General Public License, version 2.
7 */
8
9#include "./bebob.h"
10
11static int
12hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
13{
14	struct snd_bebob_stream_formation *formations = rule->private;
15	struct snd_interval *r =
16		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
17	const struct snd_interval *c =
18		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
19	struct snd_interval t = {
20		.min = UINT_MAX, .max = 0, .integer = 1
21	};
22	unsigned int i;
23
24	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
25		/* entry is invalid */
26		if (formations[i].pcm == 0)
27			continue;
28
29		if (!snd_interval_test(c, formations[i].pcm))
30			continue;
31
32		t.min = min(t.min, snd_bebob_rate_table[i]);
33		t.max = max(t.max, snd_bebob_rate_table[i]);
34
35	}
36	return snd_interval_refine(r, &t);
37}
38
39static int
40hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
41{
42	struct snd_bebob_stream_formation *formations = rule->private;
43	struct snd_interval *c =
44		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
45	const struct snd_interval *r =
46		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
47	struct snd_interval t = {
48		.min = UINT_MAX, .max = 0, .integer = 1
49	};
50
51	unsigned int i;
52
53	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
54		/* entry is invalid */
55		if (formations[i].pcm == 0)
56			continue;
57
58		if (!snd_interval_test(r, snd_bebob_rate_table[i]))
59			continue;
60
61		t.min = min(t.min, formations[i].pcm);
62		t.max = max(t.max, formations[i].pcm);
63	}
64
65	return snd_interval_refine(c, &t);
66}
67
68static void
69limit_channels_and_rates(struct snd_pcm_hardware *hw,
70			 struct snd_bebob_stream_formation *formations)
71{
72	unsigned int i;
73
74	hw->channels_min = UINT_MAX;
75	hw->channels_max = 0;
76
77	hw->rate_min = UINT_MAX;
78	hw->rate_max = 0;
79	hw->rates = 0;
80
81	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
82		/* entry has no PCM channels */
83		if (formations[i].pcm == 0)
84			continue;
85
86		hw->channels_min = min(hw->channels_min, formations[i].pcm);
87		hw->channels_max = max(hw->channels_max, formations[i].pcm);
88
89		hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]);
90		hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]);
91		hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]);
92	}
93}
94
95static void
96limit_period_and_buffer(struct snd_pcm_hardware *hw)
97{
98	hw->periods_min = 2;		/* SNDRV_PCM_INFO_BATCH */
99	hw->periods_max = UINT_MAX;
100
101	hw->period_bytes_min = 4 * hw->channels_max;	/* bytes for a frame */
102
103	/* Just to prevent from allocating much pages. */
104	hw->period_bytes_max = hw->period_bytes_min * 2048;
105	hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
106}
107
108static int
109pcm_init_hw_params(struct snd_bebob *bebob,
110		   struct snd_pcm_substream *substream)
111{
112	struct snd_pcm_runtime *runtime = substream->runtime;
113	struct amdtp_stream *s;
114	struct snd_bebob_stream_formation *formations;
115	int err;
116
117	runtime->hw.info = SNDRV_PCM_INFO_BATCH |
118			   SNDRV_PCM_INFO_BLOCK_TRANSFER |
119			   SNDRV_PCM_INFO_INTERLEAVED |
120			   SNDRV_PCM_INFO_JOINT_DUPLEX |
121			   SNDRV_PCM_INFO_MMAP |
122			   SNDRV_PCM_INFO_MMAP_VALID;
123
124	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
125		runtime->hw.formats = AMDTP_IN_PCM_FORMAT_BITS;
126		s = &bebob->tx_stream;
127		formations = bebob->tx_stream_formations;
128	} else {
129		runtime->hw.formats = AMDTP_OUT_PCM_FORMAT_BITS;
130		s = &bebob->rx_stream;
131		formations = bebob->rx_stream_formations;
132	}
133
134	limit_channels_and_rates(&runtime->hw, formations);
135	limit_period_and_buffer(&runtime->hw);
136
137	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
138				  hw_rule_channels, formations,
139				  SNDRV_PCM_HW_PARAM_RATE, -1);
140	if (err < 0)
141		goto end;
142
143	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
144				  hw_rule_rate, formations,
145				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
146	if (err < 0)
147		goto end;
148
149	err = amdtp_stream_add_pcm_hw_constraints(s, runtime);
150end:
151	return err;
152}
153
154static int
155pcm_open(struct snd_pcm_substream *substream)
156{
157	struct snd_bebob *bebob = substream->private_data;
158	struct snd_bebob_rate_spec *spec = bebob->spec->rate;
159	unsigned int sampling_rate;
160	bool internal;
161	int err;
162
163	err = snd_bebob_stream_lock_try(bebob);
164	if (err < 0)
165		goto end;
166
167	err = pcm_init_hw_params(bebob, substream);
168	if (err < 0)
169		goto err_locked;
170
171	err = snd_bebob_stream_check_internal_clock(bebob, &internal);
172	if (err < 0)
173		goto err_locked;
174
175	/*
176	 * When source of clock is internal or any PCM stream are running,
177	 * the available sampling rate is limited at current sampling rate.
178	 */
179	if (!internal ||
180	    amdtp_stream_pcm_running(&bebob->tx_stream) ||
181	    amdtp_stream_pcm_running(&bebob->rx_stream)) {
182		err = spec->get(bebob, &sampling_rate);
183		if (err < 0) {
184			dev_err(&bebob->unit->device,
185				"fail to get sampling rate: %d\n", err);
186			goto err_locked;
187		}
188
189		substream->runtime->hw.rate_min = sampling_rate;
190		substream->runtime->hw.rate_max = sampling_rate;
191	}
192
193	snd_pcm_set_sync(substream);
194end:
195	return err;
196err_locked:
197	snd_bebob_stream_lock_release(bebob);
198	return err;
199}
200
201static int
202pcm_close(struct snd_pcm_substream *substream)
203{
204	struct snd_bebob *bebob = substream->private_data;
205	snd_bebob_stream_lock_release(bebob);
206	return 0;
207}
208
209static int
210pcm_capture_hw_params(struct snd_pcm_substream *substream,
211		      struct snd_pcm_hw_params *hw_params)
212{
213	struct snd_bebob *bebob = substream->private_data;
214
215	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
216		atomic_inc(&bebob->capture_substreams);
217	amdtp_stream_set_pcm_format(&bebob->tx_stream,
218				    params_format(hw_params));
219	return snd_pcm_lib_alloc_vmalloc_buffer(substream,
220						params_buffer_bytes(hw_params));
221}
222static int
223pcm_playback_hw_params(struct snd_pcm_substream *substream,
224		       struct snd_pcm_hw_params *hw_params)
225{
226	struct snd_bebob *bebob = substream->private_data;
227
228	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
229		atomic_inc(&bebob->playback_substreams);
230	amdtp_stream_set_pcm_format(&bebob->rx_stream,
231				    params_format(hw_params));
232	return snd_pcm_lib_alloc_vmalloc_buffer(substream,
233						params_buffer_bytes(hw_params));
234}
235
236static int
237pcm_capture_hw_free(struct snd_pcm_substream *substream)
238{
239	struct snd_bebob *bebob = substream->private_data;
240
241	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
242		atomic_dec(&bebob->capture_substreams);
243
244	snd_bebob_stream_stop_duplex(bebob);
245
246	return snd_pcm_lib_free_vmalloc_buffer(substream);
247}
248static int
249pcm_playback_hw_free(struct snd_pcm_substream *substream)
250{
251	struct snd_bebob *bebob = substream->private_data;
252
253	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
254		atomic_dec(&bebob->playback_substreams);
255
256	snd_bebob_stream_stop_duplex(bebob);
257
258	return snd_pcm_lib_free_vmalloc_buffer(substream);
259}
260
261static int
262pcm_capture_prepare(struct snd_pcm_substream *substream)
263{
264	struct snd_bebob *bebob = substream->private_data;
265	struct snd_pcm_runtime *runtime = substream->runtime;
266	int err;
267
268	err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
269	if (err >= 0)
270		amdtp_stream_pcm_prepare(&bebob->tx_stream);
271
272	return err;
273}
274static int
275pcm_playback_prepare(struct snd_pcm_substream *substream)
276{
277	struct snd_bebob *bebob = substream->private_data;
278	struct snd_pcm_runtime *runtime = substream->runtime;
279	int err;
280
281	err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
282	if (err >= 0)
283		amdtp_stream_pcm_prepare(&bebob->rx_stream);
284
285	return err;
286}
287
288static int
289pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
290{
291	struct snd_bebob *bebob = substream->private_data;
292
293	switch (cmd) {
294	case SNDRV_PCM_TRIGGER_START:
295		amdtp_stream_pcm_trigger(&bebob->tx_stream, substream);
296		break;
297	case SNDRV_PCM_TRIGGER_STOP:
298		amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL);
299		break;
300	default:
301		return -EINVAL;
302	}
303
304	return 0;
305}
306static int
307pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
308{
309	struct snd_bebob *bebob = substream->private_data;
310
311	switch (cmd) {
312	case SNDRV_PCM_TRIGGER_START:
313		amdtp_stream_pcm_trigger(&bebob->rx_stream, substream);
314		break;
315	case SNDRV_PCM_TRIGGER_STOP:
316		amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL);
317		break;
318	default:
319		return -EINVAL;
320	}
321
322	return 0;
323}
324
325static snd_pcm_uframes_t
326pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
327{
328	struct snd_bebob *bebob = sbstrm->private_data;
329	return amdtp_stream_pcm_pointer(&bebob->tx_stream);
330}
331static snd_pcm_uframes_t
332pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
333{
334	struct snd_bebob *bebob = sbstrm->private_data;
335	return amdtp_stream_pcm_pointer(&bebob->rx_stream);
336}
337
338static const struct snd_pcm_ops pcm_capture_ops = {
339	.open		= pcm_open,
340	.close		= pcm_close,
341	.ioctl		= snd_pcm_lib_ioctl,
342	.hw_params	= pcm_capture_hw_params,
343	.hw_free	= pcm_capture_hw_free,
344	.prepare	= pcm_capture_prepare,
345	.trigger	= pcm_capture_trigger,
346	.pointer	= pcm_capture_pointer,
347	.page		= snd_pcm_lib_get_vmalloc_page,
348};
349static const struct snd_pcm_ops pcm_playback_ops = {
350	.open		= pcm_open,
351	.close		= pcm_close,
352	.ioctl		= snd_pcm_lib_ioctl,
353	.hw_params	= pcm_playback_hw_params,
354	.hw_free	= pcm_playback_hw_free,
355	.prepare	= pcm_playback_prepare,
356	.trigger	= pcm_playback_trigger,
357	.pointer	= pcm_playback_pointer,
358	.page		= snd_pcm_lib_get_vmalloc_page,
359	.mmap		= snd_pcm_lib_mmap_vmalloc,
360};
361
362int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
363{
364	struct snd_pcm *pcm;
365	int err;
366
367	err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm);
368	if (err < 0)
369		goto end;
370
371	pcm->private_data = bebob;
372	snprintf(pcm->name, sizeof(pcm->name),
373		 "%s PCM", bebob->card->shortname);
374	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
375	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
376end:
377	return err;
378}
379