1 /*
2  * Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com>
3  *
4  * Original author:
5  * Ben Collins <bcollins@ubuntu.com>
6  *
7  * Additional work by:
8  * John Brooks <john.brooks@bluecherry.net>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  */
20 
21 #include <linux/kernel.h>
22 #include <linux/mempool.h>
23 #include <linux/poll.h>
24 #include <linux/kthread.h>
25 #include <linux/freezer.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 
29 #include <sound/core.h>
30 #include <sound/initval.h>
31 #include <sound/pcm.h>
32 #include <sound/control.h>
33 
34 #include "solo6x10.h"
35 #include "solo6x10-tw28.h"
36 
37 #define G723_FDMA_PAGES		32
38 #define G723_PERIOD_BYTES	48
39 #define G723_PERIOD_BLOCK	1024
40 #define G723_FRAMES_PER_PAGE	48
41 
42 /* Sets up channels 16-19 for decoding and 0-15 for encoding */
43 #define OUTMODE_MASK		0x300
44 
45 #define SAMPLERATE		8000
46 #define BITRATE			25
47 
48 /* The solo writes to 1k byte pages, 32 pages, in the dma. Each 1k page
49  * is broken down to 20 * 48 byte regions (one for each channel possible)
50  * with the rest of the page being dummy data. */
51 #define PERIODS			G723_FDMA_PAGES
52 #define G723_INTR_ORDER		4 /* 0 - 4 */
53 
54 struct solo_snd_pcm {
55 	int				on;
56 	spinlock_t			lock;
57 	struct solo_dev			*solo_dev;
58 	u8				*g723_buf;
59 	dma_addr_t			g723_dma;
60 };
61 
62 static void solo_g723_config(struct solo_dev *solo_dev)
63 {
64 	int clk_div;
65 
66 	clk_div = (solo_dev->clock_mhz * 1000000)
67 		/ (SAMPLERATE * (BITRATE * 2) * 2);
68 
69 	solo_reg_write(solo_dev, SOLO_AUDIO_SAMPLE,
70 		       SOLO_AUDIO_BITRATE(BITRATE)
71 		       | SOLO_AUDIO_CLK_DIV(clk_div));
72 
73 	solo_reg_write(solo_dev, SOLO_AUDIO_FDMA_INTR,
74 		       SOLO_AUDIO_FDMA_INTERVAL(1)
75 		       | SOLO_AUDIO_INTR_ORDER(G723_INTR_ORDER)
76 		       | SOLO_AUDIO_FDMA_BASE(SOLO_G723_EXT_ADDR(solo_dev) >> 16));
77 
78 	solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL,
79 		       SOLO_AUDIO_ENABLE
80 		       | SOLO_AUDIO_I2S_MODE
81 		       | SOLO_AUDIO_I2S_MULTI(3)
82 		       | SOLO_AUDIO_MODE(OUTMODE_MASK));
83 }
84 
85 void solo_g723_isr(struct solo_dev *solo_dev)
86 {
87 	struct snd_pcm_str *pstr =
88 		&solo_dev->snd_pcm->streams[SNDRV_PCM_STREAM_CAPTURE];
89 	struct snd_pcm_substream *ss;
90 	struct solo_snd_pcm *solo_pcm;
91 
92 	for (ss = pstr->substream; ss != NULL; ss = ss->next) {
93 		if (snd_pcm_substream_chip(ss) == NULL)
94 			continue;
95 
96 		/* This means open() hasn't been called on this one */
97 		if (snd_pcm_substream_chip(ss) == solo_dev)
98 			continue;
99 
100 		/* Haven't triggered a start yet */
101 		solo_pcm = snd_pcm_substream_chip(ss);
102 		if (!solo_pcm->on)
103 			continue;
104 
105 		snd_pcm_period_elapsed(ss);
106 	}
107 }
108 
109 static int snd_solo_hw_params(struct snd_pcm_substream *ss,
110 			      struct snd_pcm_hw_params *hw_params)
111 {
112 	return snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
113 }
114 
115 static int snd_solo_hw_free(struct snd_pcm_substream *ss)
116 {
117 	return snd_pcm_lib_free_pages(ss);
118 }
119 
120 static const struct snd_pcm_hardware snd_solo_pcm_hw = {
121 	.info			= (SNDRV_PCM_INFO_MMAP |
122 				   SNDRV_PCM_INFO_INTERLEAVED |
123 				   SNDRV_PCM_INFO_BLOCK_TRANSFER |
124 				   SNDRV_PCM_INFO_MMAP_VALID),
125 	.formats		= SNDRV_PCM_FMTBIT_U8,
126 	.rates			= SNDRV_PCM_RATE_8000,
127 	.rate_min		= SAMPLERATE,
128 	.rate_max		= SAMPLERATE,
129 	.channels_min		= 1,
130 	.channels_max		= 1,
131 	.buffer_bytes_max	= G723_PERIOD_BYTES * PERIODS,
132 	.period_bytes_min	= G723_PERIOD_BYTES,
133 	.period_bytes_max	= G723_PERIOD_BYTES,
134 	.periods_min		= PERIODS,
135 	.periods_max		= PERIODS,
136 };
137 
138 static int snd_solo_pcm_open(struct snd_pcm_substream *ss)
139 {
140 	struct solo_dev *solo_dev = snd_pcm_substream_chip(ss);
141 	struct solo_snd_pcm *solo_pcm;
142 
143 	solo_pcm = kzalloc(sizeof(*solo_pcm), GFP_KERNEL);
144 	if (solo_pcm == NULL)
145 		goto oom;
146 
147 	solo_pcm->g723_buf = pci_alloc_consistent(solo_dev->pdev,
148 						  G723_PERIOD_BYTES,
149 						  &solo_pcm->g723_dma);
150 	if (solo_pcm->g723_buf == NULL)
151 		goto oom;
152 
153 	spin_lock_init(&solo_pcm->lock);
154 	solo_pcm->solo_dev = solo_dev;
155 	ss->runtime->hw = snd_solo_pcm_hw;
156 
157 	snd_pcm_substream_chip(ss) = solo_pcm;
158 
159 	return 0;
160 
161 oom:
162 	kfree(solo_pcm);
163 	return -ENOMEM;
164 }
165 
166 static int snd_solo_pcm_close(struct snd_pcm_substream *ss)
167 {
168 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
169 
170 	snd_pcm_substream_chip(ss) = solo_pcm->solo_dev;
171 	pci_free_consistent(solo_pcm->solo_dev->pdev, G723_PERIOD_BYTES,
172 			    solo_pcm->g723_buf, solo_pcm->g723_dma);
173 	kfree(solo_pcm);
174 
175 	return 0;
176 }
177 
178 static int snd_solo_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
179 {
180 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
181 	struct solo_dev *solo_dev = solo_pcm->solo_dev;
182 	int ret = 0;
183 
184 	spin_lock(&solo_pcm->lock);
185 
186 	switch (cmd) {
187 	case SNDRV_PCM_TRIGGER_START:
188 		if (solo_pcm->on == 0) {
189 			/* If this is the first user, switch on interrupts */
190 			if (atomic_inc_return(&solo_dev->snd_users) == 1)
191 				solo_irq_on(solo_dev, SOLO_IRQ_G723);
192 			solo_pcm->on = 1;
193 		}
194 		break;
195 	case SNDRV_PCM_TRIGGER_STOP:
196 		if (solo_pcm->on) {
197 			/* If this was our last user, switch them off */
198 			if (atomic_dec_return(&solo_dev->snd_users) == 0)
199 				solo_irq_off(solo_dev, SOLO_IRQ_G723);
200 			solo_pcm->on = 0;
201 		}
202 		break;
203 	default:
204 		ret = -EINVAL;
205 	}
206 
207 	spin_unlock(&solo_pcm->lock);
208 
209 	return ret;
210 }
211 
212 static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
213 {
214 	return 0;
215 }
216 
217 static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
218 {
219 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
220 	struct solo_dev *solo_dev = solo_pcm->solo_dev;
221 	snd_pcm_uframes_t idx = solo_reg_read(solo_dev, SOLO_AUDIO_STA) & 0x1f;
222 
223 	return idx * G723_FRAMES_PER_PAGE;
224 }
225 
226 static int snd_solo_pcm_copy_user(struct snd_pcm_substream *ss, int channel,
227 				  unsigned long pos, void __user *dst,
228 				  unsigned long count)
229 {
230 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
231 	struct solo_dev *solo_dev = solo_pcm->solo_dev;
232 	int err, i;
233 
234 	for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
235 		int page = (pos / G723_FRAMES_PER_PAGE) + i;
236 
237 		err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
238 				     SOLO_G723_EXT_ADDR(solo_dev) +
239 				     (page * G723_PERIOD_BLOCK) +
240 				     (ss->number * G723_PERIOD_BYTES),
241 				     G723_PERIOD_BYTES, 0, 0);
242 		if (err)
243 			return err;
244 
245 		if (copy_to_user(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES))
246 			return -EFAULT;
247 		dst += G723_PERIOD_BYTES;
248 	}
249 
250 	return 0;
251 }
252 
253 static int snd_solo_pcm_copy_kernel(struct snd_pcm_substream *ss, int channel,
254 				    unsigned long pos, void *dst,
255 				    unsigned long count)
256 {
257 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
258 	struct solo_dev *solo_dev = solo_pcm->solo_dev;
259 	int err, i;
260 
261 	for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
262 		int page = (pos / G723_FRAMES_PER_PAGE) + i;
263 
264 		err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
265 				     SOLO_G723_EXT_ADDR(solo_dev) +
266 				     (page * G723_PERIOD_BLOCK) +
267 				     (ss->number * G723_PERIOD_BYTES),
268 				     G723_PERIOD_BYTES, 0, 0);
269 		if (err)
270 			return err;
271 
272 		memcpy(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES);
273 		dst += G723_PERIOD_BYTES;
274 	}
275 
276 	return 0;
277 }
278 
279 static const struct snd_pcm_ops snd_solo_pcm_ops = {
280 	.open = snd_solo_pcm_open,
281 	.close = snd_solo_pcm_close,
282 	.ioctl = snd_pcm_lib_ioctl,
283 	.hw_params = snd_solo_hw_params,
284 	.hw_free = snd_solo_hw_free,
285 	.prepare = snd_solo_pcm_prepare,
286 	.trigger = snd_solo_pcm_trigger,
287 	.pointer = snd_solo_pcm_pointer,
288 	.copy_user = snd_solo_pcm_copy_user,
289 	.copy_kernel = snd_solo_pcm_copy_kernel,
290 };
291 
292 static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
293 					struct snd_ctl_elem_info *info)
294 {
295 	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
296 	info->count = 1;
297 	info->value.integer.min = 0;
298 	info->value.integer.max = 15;
299 	info->value.integer.step = 1;
300 
301 	return 0;
302 }
303 
304 static int snd_solo_capture_volume_get(struct snd_kcontrol *kcontrol,
305 				       struct snd_ctl_elem_value *value)
306 {
307 	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
308 	u8 ch = value->id.numid - 1;
309 
310 	value->value.integer.value[0] = tw28_get_audio_gain(solo_dev, ch);
311 
312 	return 0;
313 }
314 
315 static int snd_solo_capture_volume_put(struct snd_kcontrol *kcontrol,
316 				       struct snd_ctl_elem_value *value)
317 {
318 	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
319 	u8 ch = value->id.numid - 1;
320 	u8 old_val;
321 
322 	old_val = tw28_get_audio_gain(solo_dev, ch);
323 	if (old_val == value->value.integer.value[0])
324 		return 0;
325 
326 	tw28_set_audio_gain(solo_dev, ch, value->value.integer.value[0]);
327 
328 	return 1;
329 }
330 
331 static const struct snd_kcontrol_new snd_solo_capture_volume = {
332 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
333 	.name = "Capture Volume",
334 	.info = snd_solo_capture_volume_info,
335 	.get = snd_solo_capture_volume_get,
336 	.put = snd_solo_capture_volume_put,
337 };
338 
339 static int solo_snd_pcm_init(struct solo_dev *solo_dev)
340 {
341 	struct snd_card *card = solo_dev->snd_card;
342 	struct snd_pcm *pcm;
343 	struct snd_pcm_substream *ss;
344 	int ret;
345 	int i;
346 
347 	ret = snd_pcm_new(card, card->driver, 0, 0, solo_dev->nr_chans,
348 			  &pcm);
349 	if (ret < 0)
350 		return ret;
351 
352 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
353 			&snd_solo_pcm_ops);
354 
355 	snd_pcm_chip(pcm) = solo_dev;
356 	pcm->info_flags = 0;
357 	strscpy(pcm->name, card->shortname, sizeof(pcm->name));
358 
359 	for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
360 	     ss; ss = ss->next, i++)
361 		sprintf(ss->name, "Camera #%d Audio", i);
362 
363 	ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
364 					SNDRV_DMA_TYPE_CONTINUOUS,
365 					snd_dma_continuous_data(GFP_KERNEL),
366 					G723_PERIOD_BYTES * PERIODS,
367 					G723_PERIOD_BYTES * PERIODS);
368 	if (ret < 0)
369 		return ret;
370 
371 	solo_dev->snd_pcm = pcm;
372 
373 	return 0;
374 }
375 
376 int solo_g723_init(struct solo_dev *solo_dev)
377 {
378 	static struct snd_device_ops ops = { };
379 	struct snd_card *card;
380 	struct snd_kcontrol_new kctl;
381 	char name[32];
382 	int ret;
383 
384 	atomic_set(&solo_dev->snd_users, 0);
385 
386 	/* Allows for easier mapping between video and audio */
387 	sprintf(name, "Softlogic%d", solo_dev->vfd->num);
388 
389 	ret = snd_card_new(&solo_dev->pdev->dev,
390 			   SNDRV_DEFAULT_IDX1, name, THIS_MODULE, 0,
391 			   &solo_dev->snd_card);
392 	if (ret < 0)
393 		return ret;
394 
395 	card = solo_dev->snd_card;
396 
397 	strscpy(card->driver, SOLO6X10_NAME, sizeof(card->driver));
398 	strscpy(card->shortname, "SOLO-6x10 Audio", sizeof(card->shortname));
399 	sprintf(card->longname, "%s on %s IRQ %d", card->shortname,
400 		pci_name(solo_dev->pdev), solo_dev->pdev->irq);
401 
402 	ret = snd_device_new(card, SNDRV_DEV_LOWLEVEL, solo_dev, &ops);
403 	if (ret < 0)
404 		goto snd_error;
405 
406 	/* Mixer controls */
407 	strscpy(card->mixername, "SOLO-6x10", sizeof(card->mixername));
408 	kctl = snd_solo_capture_volume;
409 	kctl.count = solo_dev->nr_chans;
410 
411 	ret = snd_ctl_add(card, snd_ctl_new1(&kctl, solo_dev));
412 	if (ret < 0)
413 		return ret;
414 
415 	ret = solo_snd_pcm_init(solo_dev);
416 	if (ret < 0)
417 		goto snd_error;
418 
419 	ret = snd_card_register(card);
420 	if (ret < 0)
421 		goto snd_error;
422 
423 	solo_g723_config(solo_dev);
424 
425 	dev_info(&solo_dev->pdev->dev, "Alsa sound card as %s\n", name);
426 
427 	return 0;
428 
429 snd_error:
430 	snd_card_free(card);
431 	return ret;
432 }
433 
434 void solo_g723_exit(struct solo_dev *solo_dev)
435 {
436 	if (!solo_dev->snd_card)
437 		return;
438 
439 	solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL, 0);
440 	solo_irq_off(solo_dev, SOLO_IRQ_G723);
441 
442 	snd_card_free(solo_dev->snd_card);
443 	solo_dev->snd_card = NULL;
444 }
445