1 /*
2  * fireworks_stream.c - a part of driver for Fireworks 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 #include "./fireworks.h"
9 
10 #define CALLBACK_TIMEOUT	100
11 
12 static int
13 init_stream(struct snd_efw *efw, struct amdtp_stream *stream)
14 {
15 	struct cmp_connection *conn;
16 	enum cmp_direction c_dir;
17 	enum amdtp_stream_direction s_dir;
18 	int err;
19 
20 	if (stream == &efw->tx_stream) {
21 		conn = &efw->out_conn;
22 		c_dir = CMP_OUTPUT;
23 		s_dir = AMDTP_IN_STREAM;
24 	} else {
25 		conn = &efw->in_conn;
26 		c_dir = CMP_INPUT;
27 		s_dir = AMDTP_OUT_STREAM;
28 	}
29 
30 	err = cmp_connection_init(conn, efw->unit, c_dir, 0);
31 	if (err < 0)
32 		goto end;
33 
34 	err = amdtp_stream_init(stream, efw->unit, s_dir, CIP_BLOCKING);
35 	if (err < 0) {
36 		amdtp_stream_destroy(stream);
37 		cmp_connection_destroy(conn);
38 	}
39 end:
40 	return err;
41 }
42 
43 static void
44 stop_stream(struct snd_efw *efw, struct amdtp_stream *stream)
45 {
46 	amdtp_stream_pcm_abort(stream);
47 	amdtp_stream_stop(stream);
48 
49 	if (stream == &efw->tx_stream)
50 		cmp_connection_break(&efw->out_conn);
51 	else
52 		cmp_connection_break(&efw->in_conn);
53 }
54 
55 static int
56 start_stream(struct snd_efw *efw, struct amdtp_stream *stream,
57 	     unsigned int sampling_rate)
58 {
59 	struct cmp_connection *conn;
60 	unsigned int mode, pcm_channels, midi_ports;
61 	int err;
62 
63 	err = snd_efw_get_multiplier_mode(sampling_rate, &mode);
64 	if (err < 0)
65 		goto end;
66 	if (stream == &efw->tx_stream) {
67 		conn = &efw->out_conn;
68 		pcm_channels = efw->pcm_capture_channels[mode];
69 		midi_ports = efw->midi_out_ports;
70 	} else {
71 		conn = &efw->in_conn;
72 		pcm_channels = efw->pcm_playback_channels[mode];
73 		midi_ports = efw->midi_in_ports;
74 	}
75 
76 	amdtp_stream_set_parameters(stream, sampling_rate,
77 				    pcm_channels, midi_ports);
78 
79 	/*  establish connection via CMP */
80 	err = cmp_connection_establish(conn,
81 				amdtp_stream_get_max_payload(stream));
82 	if (err < 0)
83 		goto end;
84 
85 	/* start amdtp stream */
86 	err = amdtp_stream_start(stream,
87 				 conn->resources.channel,
88 				 conn->speed);
89 	if (err < 0) {
90 		stop_stream(efw, stream);
91 		goto end;
92 	}
93 
94 	/* wait first callback */
95 	if (!amdtp_stream_wait_callback(stream, CALLBACK_TIMEOUT)) {
96 		stop_stream(efw, stream);
97 		err = -ETIMEDOUT;
98 	}
99 end:
100 	return err;
101 }
102 
103 /*
104  * This function should be called before starting the stream or after stopping
105  * the streams.
106  */
107 static void
108 destroy_stream(struct snd_efw *efw, struct amdtp_stream *stream)
109 {
110 	struct cmp_connection *conn;
111 
112 	if (stream == &efw->tx_stream)
113 		conn = &efw->out_conn;
114 	else
115 		conn = &efw->in_conn;
116 
117 	amdtp_stream_destroy(stream);
118 	cmp_connection_destroy(&efw->out_conn);
119 }
120 
121 static int
122 get_sync_mode(struct snd_efw *efw, enum cip_flags *sync_mode)
123 {
124 	enum snd_efw_clock_source clock_source;
125 	int err;
126 
127 	err = snd_efw_command_get_clock_source(efw, &clock_source);
128 	if (err < 0)
129 		return err;
130 
131 	if (clock_source == SND_EFW_CLOCK_SOURCE_SYTMATCH)
132 		return -ENOSYS;
133 
134 	*sync_mode = CIP_SYNC_TO_DEVICE;
135 	return 0;
136 }
137 
138 static int
139 check_connection_used_by_others(struct snd_efw *efw, struct amdtp_stream *s)
140 {
141 	struct cmp_connection *conn;
142 	bool used;
143 	int err;
144 
145 	if (s == &efw->tx_stream)
146 		conn = &efw->out_conn;
147 	else
148 		conn = &efw->in_conn;
149 
150 	err = cmp_connection_check_used(conn, &used);
151 	if ((err >= 0) && used && !amdtp_stream_running(s)) {
152 		dev_err(&efw->unit->device,
153 			"Connection established by others: %cPCR[%d]\n",
154 			(conn->direction == CMP_OUTPUT) ? 'o' : 'i',
155 			conn->pcr_index);
156 		err = -EBUSY;
157 	}
158 
159 	return err;
160 }
161 
162 int snd_efw_stream_init_duplex(struct snd_efw *efw)
163 {
164 	int err;
165 
166 	err = init_stream(efw, &efw->tx_stream);
167 	if (err < 0)
168 		goto end;
169 	/* Fireworks transmits NODATA packets with TAG0. */
170 	efw->tx_stream.flags |= CIP_EMPTY_WITH_TAG0;
171 	/* Fireworks has its own meaning for dbc. */
172 	efw->tx_stream.flags |= CIP_DBC_IS_END_EVENT;
173 	/* Fireworks reset dbc at bus reset. */
174 	efw->tx_stream.flags |= CIP_SKIP_DBC_ZERO_CHECK;
175 	/* AudioFire9 always reports wrong dbs. */
176 	if (efw->is_af9)
177 		efw->tx_stream.flags |= CIP_WRONG_DBS;
178 	/* Firmware version 5.5 reports fixed interval for dbc. */
179 	if (efw->firmware_version == 0x5050000)
180 		efw->tx_stream.tx_dbc_interval = 8;
181 
182 	err = init_stream(efw, &efw->rx_stream);
183 	if (err < 0) {
184 		destroy_stream(efw, &efw->tx_stream);
185 		goto end;
186 	}
187 
188 	/* set IEC61883 compliant mode (actually not fully compliant...) */
189 	err = snd_efw_command_set_tx_mode(efw, SND_EFW_TRANSPORT_MODE_IEC61883);
190 	if (err < 0) {
191 		destroy_stream(efw, &efw->tx_stream);
192 		destroy_stream(efw, &efw->rx_stream);
193 	}
194 end:
195 	return err;
196 }
197 
198 int snd_efw_stream_start_duplex(struct snd_efw *efw, unsigned int rate)
199 {
200 	struct amdtp_stream *master, *slave;
201 	atomic_t *slave_substreams;
202 	enum cip_flags sync_mode;
203 	unsigned int curr_rate;
204 	int err = 0;
205 
206 	mutex_lock(&efw->mutex);
207 
208 	/* Need no substreams */
209 	if ((atomic_read(&efw->playback_substreams) == 0) &&
210 	    (atomic_read(&efw->capture_substreams)  == 0))
211 		goto end;
212 
213 	err = get_sync_mode(efw, &sync_mode);
214 	if (err < 0)
215 		goto end;
216 	if (sync_mode == CIP_SYNC_TO_DEVICE) {
217 		master = &efw->tx_stream;
218 		slave  = &efw->rx_stream;
219 		slave_substreams  = &efw->playback_substreams;
220 	} else {
221 		master = &efw->rx_stream;
222 		slave  = &efw->tx_stream;
223 		slave_substreams = &efw->capture_substreams;
224 	}
225 
226 	/*
227 	 * Considering JACK/FFADO streaming:
228 	 * TODO: This can be removed hwdep functionality becomes popular.
229 	 */
230 	err = check_connection_used_by_others(efw, master);
231 	if (err < 0)
232 		goto end;
233 
234 	/* packet queueing error */
235 	if (amdtp_streaming_error(slave))
236 		stop_stream(efw, slave);
237 	if (amdtp_streaming_error(master))
238 		stop_stream(efw, master);
239 
240 	/* stop streams if rate is different */
241 	err = snd_efw_command_get_sampling_rate(efw, &curr_rate);
242 	if (err < 0)
243 		goto end;
244 	if (rate == 0)
245 		rate = curr_rate;
246 	if (rate != curr_rate) {
247 		stop_stream(efw, slave);
248 		stop_stream(efw, master);
249 	}
250 
251 	/* master should be always running */
252 	if (!amdtp_stream_running(master)) {
253 		amdtp_stream_set_sync(sync_mode, master, slave);
254 		efw->master = master;
255 
256 		err = snd_efw_command_set_sampling_rate(efw, rate);
257 		if (err < 0)
258 			goto end;
259 
260 		err = start_stream(efw, master, rate);
261 		if (err < 0) {
262 			dev_err(&efw->unit->device,
263 				"fail to start AMDTP master stream:%d\n", err);
264 			goto end;
265 		}
266 	}
267 
268 	/* start slave if needed */
269 	if (atomic_read(slave_substreams) > 0 && !amdtp_stream_running(slave)) {
270 		err = start_stream(efw, slave, rate);
271 		if (err < 0) {
272 			dev_err(&efw->unit->device,
273 				"fail to start AMDTP slave stream:%d\n", err);
274 			stop_stream(efw, master);
275 		}
276 	}
277 end:
278 	mutex_unlock(&efw->mutex);
279 	return err;
280 }
281 
282 void snd_efw_stream_stop_duplex(struct snd_efw *efw)
283 {
284 	struct amdtp_stream *master, *slave;
285 	atomic_t *master_substreams, *slave_substreams;
286 
287 	if (efw->master == &efw->rx_stream) {
288 		slave  = &efw->tx_stream;
289 		master = &efw->rx_stream;
290 		slave_substreams  = &efw->capture_substreams;
291 		master_substreams = &efw->playback_substreams;
292 	} else {
293 		slave  = &efw->rx_stream;
294 		master = &efw->tx_stream;
295 		slave_substreams  = &efw->playback_substreams;
296 		master_substreams = &efw->capture_substreams;
297 	}
298 
299 	mutex_lock(&efw->mutex);
300 
301 	if (atomic_read(slave_substreams) == 0) {
302 		stop_stream(efw, slave);
303 
304 		if (atomic_read(master_substreams) == 0)
305 			stop_stream(efw, master);
306 	}
307 
308 	mutex_unlock(&efw->mutex);
309 }
310 
311 void snd_efw_stream_update_duplex(struct snd_efw *efw)
312 {
313 	if ((cmp_connection_update(&efw->out_conn) < 0) ||
314 	    (cmp_connection_update(&efw->in_conn) < 0)) {
315 		mutex_lock(&efw->mutex);
316 		stop_stream(efw, &efw->rx_stream);
317 		stop_stream(efw, &efw->tx_stream);
318 		mutex_unlock(&efw->mutex);
319 	} else {
320 		amdtp_stream_update(&efw->rx_stream);
321 		amdtp_stream_update(&efw->tx_stream);
322 	}
323 }
324 
325 void snd_efw_stream_destroy_duplex(struct snd_efw *efw)
326 {
327 	destroy_stream(efw, &efw->rx_stream);
328 	destroy_stream(efw, &efw->tx_stream);
329 }
330 
331 void snd_efw_stream_lock_changed(struct snd_efw *efw)
332 {
333 	efw->dev_lock_changed = true;
334 	wake_up(&efw->hwdep_wait);
335 }
336 
337 int snd_efw_stream_lock_try(struct snd_efw *efw)
338 {
339 	int err;
340 
341 	spin_lock_irq(&efw->lock);
342 
343 	/* user land lock this */
344 	if (efw->dev_lock_count < 0) {
345 		err = -EBUSY;
346 		goto end;
347 	}
348 
349 	/* this is the first time */
350 	if (efw->dev_lock_count++ == 0)
351 		snd_efw_stream_lock_changed(efw);
352 	err = 0;
353 end:
354 	spin_unlock_irq(&efw->lock);
355 	return err;
356 }
357 
358 void snd_efw_stream_lock_release(struct snd_efw *efw)
359 {
360 	spin_lock_irq(&efw->lock);
361 
362 	if (WARN_ON(efw->dev_lock_count <= 0))
363 		goto end;
364 	if (--efw->dev_lock_count == 0)
365 		snd_efw_stream_lock_changed(efw);
366 end:
367 	spin_unlock_irq(&efw->lock);
368 }
369