1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * fireworks_stream.c - a part of driver for Fireworks based devices
4  *
5  * Copyright (c) 2013-2014 Takashi Sakamoto
6  */
7 #include "./fireworks.h"
8 
9 #define CALLBACK_TIMEOUT	100
10 
11 static int init_stream(struct snd_efw *efw, struct amdtp_stream *stream)
12 {
13 	struct cmp_connection *conn;
14 	enum cmp_direction c_dir;
15 	enum amdtp_stream_direction s_dir;
16 	int err;
17 
18 	if (stream == &efw->tx_stream) {
19 		conn = &efw->out_conn;
20 		c_dir = CMP_OUTPUT;
21 		s_dir = AMDTP_IN_STREAM;
22 	} else {
23 		conn = &efw->in_conn;
24 		c_dir = CMP_INPUT;
25 		s_dir = AMDTP_OUT_STREAM;
26 	}
27 
28 	err = cmp_connection_init(conn, efw->unit, c_dir, 0);
29 	if (err < 0)
30 		return err;
31 
32 	err = amdtp_am824_init(stream, efw->unit, s_dir, CIP_BLOCKING);
33 	if (err < 0) {
34 		amdtp_stream_destroy(stream);
35 		cmp_connection_destroy(conn);
36 		return err;
37 	}
38 
39 	if (stream == &efw->tx_stream) {
40 		// Fireworks transmits NODATA packets with TAG0.
41 		efw->tx_stream.flags |= CIP_EMPTY_WITH_TAG0;
42 		// Fireworks has its own meaning for dbc.
43 		efw->tx_stream.flags |= CIP_DBC_IS_END_EVENT;
44 		// Fireworks reset dbc at bus reset.
45 		efw->tx_stream.flags |= CIP_SKIP_DBC_ZERO_CHECK;
46 		// But Recent firmwares starts packets with non-zero dbc.
47 		// Driver version 5.7.6 installs firmware version 5.7.3.
48 		if (efw->is_fireworks3 &&
49 		    (efw->firmware_version == 0x5070000 ||
50 		     efw->firmware_version == 0x5070300 ||
51 		     efw->firmware_version == 0x5080000))
52 			efw->tx_stream.flags |= CIP_UNALIGHED_DBC;
53 		// AudioFire9 always reports wrong dbs.
54 		if (efw->is_af9)
55 			efw->tx_stream.flags |= CIP_WRONG_DBS;
56 		// Firmware version 5.5 reports fixed interval for dbc.
57 		if (efw->firmware_version == 0x5050000)
58 			efw->tx_stream.ctx_data.tx.dbc_interval = 8;
59 	}
60 
61 	return err;
62 }
63 
64 static int start_stream(struct snd_efw *efw, struct amdtp_stream *stream,
65 			unsigned int rate)
66 {
67 	struct cmp_connection *conn;
68 	int err;
69 
70 	if (stream == &efw->tx_stream)
71 		conn = &efw->out_conn;
72 	else
73 		conn = &efw->in_conn;
74 
75 	// Establish connection via CMP.
76 	err = cmp_connection_establish(conn);
77 	if (err < 0)
78 		return err;
79 
80 	// Start amdtp stream.
81 	err = amdtp_domain_add_stream(&efw->domain, stream,
82 				      conn->resources.channel, conn->speed);
83 	if (err < 0) {
84 		cmp_connection_break(conn);
85 		return err;
86 	}
87 
88 	return 0;
89 }
90 
91 // This function should be called before starting the stream or after stopping
92 // the streams.
93 static void destroy_stream(struct snd_efw *efw, struct amdtp_stream *stream)
94 {
95 	amdtp_stream_destroy(stream);
96 
97 	if (stream == &efw->tx_stream)
98 		cmp_connection_destroy(&efw->out_conn);
99 	else
100 		cmp_connection_destroy(&efw->in_conn);
101 }
102 
103 static int
104 check_connection_used_by_others(struct snd_efw *efw, struct amdtp_stream *s)
105 {
106 	struct cmp_connection *conn;
107 	bool used;
108 	int err;
109 
110 	if (s == &efw->tx_stream)
111 		conn = &efw->out_conn;
112 	else
113 		conn = &efw->in_conn;
114 
115 	err = cmp_connection_check_used(conn, &used);
116 	if ((err >= 0) && used && !amdtp_stream_running(s)) {
117 		dev_err(&efw->unit->device,
118 			"Connection established by others: %cPCR[%d]\n",
119 			(conn->direction == CMP_OUTPUT) ? 'o' : 'i',
120 			conn->pcr_index);
121 		err = -EBUSY;
122 	}
123 
124 	return err;
125 }
126 
127 int snd_efw_stream_init_duplex(struct snd_efw *efw)
128 {
129 	int err;
130 
131 	err = init_stream(efw, &efw->tx_stream);
132 	if (err < 0)
133 		return err;
134 
135 	err = init_stream(efw, &efw->rx_stream);
136 	if (err < 0) {
137 		destroy_stream(efw, &efw->tx_stream);
138 		return err;
139 	}
140 
141 	err = amdtp_domain_init(&efw->domain);
142 	if (err < 0) {
143 		destroy_stream(efw, &efw->tx_stream);
144 		destroy_stream(efw, &efw->rx_stream);
145 		return err;
146 	}
147 
148 	// set IEC61883 compliant mode (actually not fully compliant...).
149 	err = snd_efw_command_set_tx_mode(efw, SND_EFW_TRANSPORT_MODE_IEC61883);
150 	if (err < 0) {
151 		destroy_stream(efw, &efw->tx_stream);
152 		destroy_stream(efw, &efw->rx_stream);
153 	}
154 
155 	return err;
156 }
157 
158 static int keep_resources(struct snd_efw *efw, struct amdtp_stream *stream,
159 			  unsigned int rate, unsigned int mode)
160 {
161 	unsigned int pcm_channels;
162 	unsigned int midi_ports;
163 	struct cmp_connection *conn;
164 	int err;
165 
166 	if (stream == &efw->tx_stream) {
167 		pcm_channels = efw->pcm_capture_channels[mode];
168 		midi_ports = efw->midi_out_ports;
169 		conn = &efw->out_conn;
170 	} else {
171 		pcm_channels = efw->pcm_playback_channels[mode];
172 		midi_ports = efw->midi_in_ports;
173 		conn = &efw->in_conn;
174 	}
175 
176 	err = amdtp_am824_set_parameters(stream, rate, pcm_channels,
177 					 midi_ports, false);
178 	if (err < 0)
179 		return err;
180 
181 	return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));
182 }
183 
184 int snd_efw_stream_reserve_duplex(struct snd_efw *efw, unsigned int rate)
185 {
186 	unsigned int curr_rate;
187 	int err;
188 
189 	// Considering JACK/FFADO streaming:
190 	// TODO: This can be removed hwdep functionality becomes popular.
191 	err = check_connection_used_by_others(efw, &efw->rx_stream);
192 	if (err < 0)
193 		return err;
194 
195 	// stop streams if rate is different.
196 	err = snd_efw_command_get_sampling_rate(efw, &curr_rate);
197 	if (err < 0)
198 		return err;
199 	if (rate == 0)
200 		rate = curr_rate;
201 	if (rate != curr_rate) {
202 		amdtp_domain_stop(&efw->domain);
203 
204 		cmp_connection_break(&efw->out_conn);
205 		cmp_connection_break(&efw->in_conn);
206 
207 		cmp_connection_release(&efw->out_conn);
208 		cmp_connection_release(&efw->in_conn);
209 	}
210 
211 	if (efw->substreams_counter == 0 || rate != curr_rate) {
212 		unsigned int mode;
213 
214 		err = snd_efw_command_set_sampling_rate(efw, rate);
215 		if (err < 0)
216 			return err;
217 
218 		err = snd_efw_get_multiplier_mode(rate, &mode);
219 		if (err < 0)
220 			return err;
221 
222 		err = keep_resources(efw, &efw->tx_stream, rate, mode);
223 		if (err < 0)
224 			return err;
225 
226 		err = keep_resources(efw, &efw->rx_stream, rate, mode);
227 		if (err < 0) {
228 			cmp_connection_release(&efw->in_conn);
229 			return err;
230 		}
231 	}
232 
233 	return 0;
234 }
235 
236 int snd_efw_stream_start_duplex(struct snd_efw *efw)
237 {
238 	unsigned int rate;
239 	int err = 0;
240 
241 	// Need no substreams.
242 	if (efw->substreams_counter == 0)
243 		return -EIO;
244 
245 	if (amdtp_streaming_error(&efw->rx_stream) ||
246 	    amdtp_streaming_error(&efw->tx_stream)) {
247 		amdtp_domain_stop(&efw->domain);
248 		cmp_connection_break(&efw->out_conn);
249 		cmp_connection_break(&efw->in_conn);
250 	}
251 
252 	err = snd_efw_command_get_sampling_rate(efw, &rate);
253 	if (err < 0)
254 		return err;
255 
256 	if (!amdtp_stream_running(&efw->rx_stream)) {
257 		err = start_stream(efw, &efw->rx_stream, rate);
258 		if (err < 0)
259 			goto error;
260 
261 		err = start_stream(efw, &efw->tx_stream, rate);
262 		if (err < 0)
263 			goto error;
264 
265 		err = amdtp_domain_start(&efw->domain);
266 		if (err < 0)
267 			goto error;
268 
269 		// Wait first callback.
270 		if (!amdtp_stream_wait_callback(&efw->rx_stream,
271 						CALLBACK_TIMEOUT) ||
272 		    !amdtp_stream_wait_callback(&efw->tx_stream,
273 						CALLBACK_TIMEOUT)) {
274 			err = -ETIMEDOUT;
275 			goto error;
276 		}
277 	}
278 
279 	return 0;
280 error:
281 	amdtp_domain_stop(&efw->domain);
282 
283 	cmp_connection_break(&efw->out_conn);
284 	cmp_connection_break(&efw->in_conn);
285 
286 	return err;
287 }
288 
289 void snd_efw_stream_stop_duplex(struct snd_efw *efw)
290 {
291 	if (efw->substreams_counter == 0) {
292 		amdtp_domain_stop(&efw->domain);
293 
294 		cmp_connection_break(&efw->out_conn);
295 		cmp_connection_break(&efw->in_conn);
296 
297 		cmp_connection_release(&efw->out_conn);
298 		cmp_connection_release(&efw->in_conn);
299 	}
300 }
301 
302 void snd_efw_stream_update_duplex(struct snd_efw *efw)
303 {
304 	amdtp_domain_stop(&efw->domain);
305 
306 	cmp_connection_break(&efw->out_conn);
307 	cmp_connection_break(&efw->in_conn);
308 
309 	amdtp_stream_pcm_abort(&efw->rx_stream);
310 	amdtp_stream_pcm_abort(&efw->tx_stream);
311 }
312 
313 void snd_efw_stream_destroy_duplex(struct snd_efw *efw)
314 {
315 	amdtp_domain_destroy(&efw->domain);
316 
317 	destroy_stream(efw, &efw->rx_stream);
318 	destroy_stream(efw, &efw->tx_stream);
319 }
320 
321 void snd_efw_stream_lock_changed(struct snd_efw *efw)
322 {
323 	efw->dev_lock_changed = true;
324 	wake_up(&efw->hwdep_wait);
325 }
326 
327 int snd_efw_stream_lock_try(struct snd_efw *efw)
328 {
329 	int err;
330 
331 	spin_lock_irq(&efw->lock);
332 
333 	/* user land lock this */
334 	if (efw->dev_lock_count < 0) {
335 		err = -EBUSY;
336 		goto end;
337 	}
338 
339 	/* this is the first time */
340 	if (efw->dev_lock_count++ == 0)
341 		snd_efw_stream_lock_changed(efw);
342 	err = 0;
343 end:
344 	spin_unlock_irq(&efw->lock);
345 	return err;
346 }
347 
348 void snd_efw_stream_lock_release(struct snd_efw *efw)
349 {
350 	spin_lock_irq(&efw->lock);
351 
352 	if (WARN_ON(efw->dev_lock_count <= 0))
353 		goto end;
354 	if (--efw->dev_lock_count == 0)
355 		snd_efw_stream_lock_changed(efw);
356 end:
357 	spin_unlock_irq(&efw->lock);
358 }
359