1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com>
4  *
5  * Original author:
6  * Ben Collins <bcollins@ubuntu.com>
7  *
8  * Additional work by:
9  * John Brooks <john.brooks@bluecherry.net>
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/mempool.h>
14 #include <linux/poll.h>
15 #include <linux/kthread.h>
16 #include <linux/freezer.h>
17 #include <linux/module.h>
18 #include <linux/slab.h>
19 
20 #include <sound/core.h>
21 #include <sound/initval.h>
22 #include <sound/pcm.h>
23 #include <sound/control.h>
24 
25 #include "solo6x10.h"
26 #include "solo6x10-tw28.h"
27 
28 #define G723_FDMA_PAGES		32
29 #define G723_PERIOD_BYTES	48
30 #define G723_PERIOD_BLOCK	1024
31 #define G723_FRAMES_PER_PAGE	48
32 
33 /* Sets up channels 16-19 for decoding and 0-15 for encoding */
34 #define OUTMODE_MASK		0x300
35 
36 #define SAMPLERATE		8000
37 #define BITRATE			25
38 
39 /* The solo writes to 1k byte pages, 32 pages, in the dma. Each 1k page
40  * is broken down to 20 * 48 byte regions (one for each channel possible)
41  * with the rest of the page being dummy data. */
42 #define PERIODS			G723_FDMA_PAGES
43 #define G723_INTR_ORDER		4 /* 0 - 4 */
44 
45 struct solo_snd_pcm {
46 	int				on;
47 	spinlock_t			lock;
48 	struct solo_dev			*solo_dev;
49 	u8				*g723_buf;
50 	dma_addr_t			g723_dma;
51 };
52 
53 static void solo_g723_config(struct solo_dev *solo_dev)
54 {
55 	int clk_div;
56 
57 	clk_div = (solo_dev->clock_mhz * 1000000)
58 		/ (SAMPLERATE * (BITRATE * 2) * 2);
59 
60 	solo_reg_write(solo_dev, SOLO_AUDIO_SAMPLE,
61 		       SOLO_AUDIO_BITRATE(BITRATE)
62 		       | SOLO_AUDIO_CLK_DIV(clk_div));
63 
64 	solo_reg_write(solo_dev, SOLO_AUDIO_FDMA_INTR,
65 		       SOLO_AUDIO_FDMA_INTERVAL(1)
66 		       | SOLO_AUDIO_INTR_ORDER(G723_INTR_ORDER)
67 		       | SOLO_AUDIO_FDMA_BASE(SOLO_G723_EXT_ADDR(solo_dev) >> 16));
68 
69 	solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL,
70 		       SOLO_AUDIO_ENABLE
71 		       | SOLO_AUDIO_I2S_MODE
72 		       | SOLO_AUDIO_I2S_MULTI(3)
73 		       | SOLO_AUDIO_MODE(OUTMODE_MASK));
74 }
75 
76 void solo_g723_isr(struct solo_dev *solo_dev)
77 {
78 	struct snd_pcm_str *pstr =
79 		&solo_dev->snd_pcm->streams[SNDRV_PCM_STREAM_CAPTURE];
80 	struct snd_pcm_substream *ss;
81 	struct solo_snd_pcm *solo_pcm;
82 
83 	for (ss = pstr->substream; ss != NULL; ss = ss->next) {
84 		if (snd_pcm_substream_chip(ss) == NULL)
85 			continue;
86 
87 		/* This means open() hasn't been called on this one */
88 		if (snd_pcm_substream_chip(ss) == solo_dev)
89 			continue;
90 
91 		/* Haven't triggered a start yet */
92 		solo_pcm = snd_pcm_substream_chip(ss);
93 		if (!solo_pcm->on)
94 			continue;
95 
96 		snd_pcm_period_elapsed(ss);
97 	}
98 }
99 
100 static int snd_solo_hw_params(struct snd_pcm_substream *ss,
101 			      struct snd_pcm_hw_params *hw_params)
102 {
103 	return snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
104 }
105 
106 static int snd_solo_hw_free(struct snd_pcm_substream *ss)
107 {
108 	return snd_pcm_lib_free_pages(ss);
109 }
110 
111 static const struct snd_pcm_hardware snd_solo_pcm_hw = {
112 	.info			= (SNDRV_PCM_INFO_MMAP |
113 				   SNDRV_PCM_INFO_INTERLEAVED |
114 				   SNDRV_PCM_INFO_BLOCK_TRANSFER |
115 				   SNDRV_PCM_INFO_MMAP_VALID),
116 	.formats		= SNDRV_PCM_FMTBIT_U8,
117 	.rates			= SNDRV_PCM_RATE_8000,
118 	.rate_min		= SAMPLERATE,
119 	.rate_max		= SAMPLERATE,
120 	.channels_min		= 1,
121 	.channels_max		= 1,
122 	.buffer_bytes_max	= G723_PERIOD_BYTES * PERIODS,
123 	.period_bytes_min	= G723_PERIOD_BYTES,
124 	.period_bytes_max	= G723_PERIOD_BYTES,
125 	.periods_min		= PERIODS,
126 	.periods_max		= PERIODS,
127 };
128 
129 static int snd_solo_pcm_open(struct snd_pcm_substream *ss)
130 {
131 	struct solo_dev *solo_dev = snd_pcm_substream_chip(ss);
132 	struct solo_snd_pcm *solo_pcm;
133 
134 	solo_pcm = kzalloc(sizeof(*solo_pcm), GFP_KERNEL);
135 	if (solo_pcm == NULL)
136 		goto oom;
137 
138 	solo_pcm->g723_buf = pci_alloc_consistent(solo_dev->pdev,
139 						  G723_PERIOD_BYTES,
140 						  &solo_pcm->g723_dma);
141 	if (solo_pcm->g723_buf == NULL)
142 		goto oom;
143 
144 	spin_lock_init(&solo_pcm->lock);
145 	solo_pcm->solo_dev = solo_dev;
146 	ss->runtime->hw = snd_solo_pcm_hw;
147 
148 	snd_pcm_substream_chip(ss) = solo_pcm;
149 
150 	return 0;
151 
152 oom:
153 	kfree(solo_pcm);
154 	return -ENOMEM;
155 }
156 
157 static int snd_solo_pcm_close(struct snd_pcm_substream *ss)
158 {
159 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
160 
161 	snd_pcm_substream_chip(ss) = solo_pcm->solo_dev;
162 	pci_free_consistent(solo_pcm->solo_dev->pdev, G723_PERIOD_BYTES,
163 			    solo_pcm->g723_buf, solo_pcm->g723_dma);
164 	kfree(solo_pcm);
165 
166 	return 0;
167 }
168 
169 static int snd_solo_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
170 {
171 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
172 	struct solo_dev *solo_dev = solo_pcm->solo_dev;
173 	int ret = 0;
174 
175 	spin_lock(&solo_pcm->lock);
176 
177 	switch (cmd) {
178 	case SNDRV_PCM_TRIGGER_START:
179 		if (solo_pcm->on == 0) {
180 			/* If this is the first user, switch on interrupts */
181 			if (atomic_inc_return(&solo_dev->snd_users) == 1)
182 				solo_irq_on(solo_dev, SOLO_IRQ_G723);
183 			solo_pcm->on = 1;
184 		}
185 		break;
186 	case SNDRV_PCM_TRIGGER_STOP:
187 		if (solo_pcm->on) {
188 			/* If this was our last user, switch them off */
189 			if (atomic_dec_return(&solo_dev->snd_users) == 0)
190 				solo_irq_off(solo_dev, SOLO_IRQ_G723);
191 			solo_pcm->on = 0;
192 		}
193 		break;
194 	default:
195 		ret = -EINVAL;
196 	}
197 
198 	spin_unlock(&solo_pcm->lock);
199 
200 	return ret;
201 }
202 
203 static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
204 {
205 	return 0;
206 }
207 
208 static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
209 {
210 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
211 	struct solo_dev *solo_dev = solo_pcm->solo_dev;
212 	snd_pcm_uframes_t idx = solo_reg_read(solo_dev, SOLO_AUDIO_STA) & 0x1f;
213 
214 	return idx * G723_FRAMES_PER_PAGE;
215 }
216 
217 static int snd_solo_pcm_copy_user(struct snd_pcm_substream *ss, int channel,
218 				  unsigned long pos, void __user *dst,
219 				  unsigned long count)
220 {
221 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
222 	struct solo_dev *solo_dev = solo_pcm->solo_dev;
223 	int err, i;
224 
225 	for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
226 		int page = (pos / G723_FRAMES_PER_PAGE) + i;
227 
228 		err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
229 				     SOLO_G723_EXT_ADDR(solo_dev) +
230 				     (page * G723_PERIOD_BLOCK) +
231 				     (ss->number * G723_PERIOD_BYTES),
232 				     G723_PERIOD_BYTES, 0, 0);
233 		if (err)
234 			return err;
235 
236 		if (copy_to_user(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES))
237 			return -EFAULT;
238 		dst += G723_PERIOD_BYTES;
239 	}
240 
241 	return 0;
242 }
243 
244 static int snd_solo_pcm_copy_kernel(struct snd_pcm_substream *ss, int channel,
245 				    unsigned long pos, void *dst,
246 				    unsigned long count)
247 {
248 	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
249 	struct solo_dev *solo_dev = solo_pcm->solo_dev;
250 	int err, i;
251 
252 	for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
253 		int page = (pos / G723_FRAMES_PER_PAGE) + i;
254 
255 		err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
256 				     SOLO_G723_EXT_ADDR(solo_dev) +
257 				     (page * G723_PERIOD_BLOCK) +
258 				     (ss->number * G723_PERIOD_BYTES),
259 				     G723_PERIOD_BYTES, 0, 0);
260 		if (err)
261 			return err;
262 
263 		memcpy(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES);
264 		dst += G723_PERIOD_BYTES;
265 	}
266 
267 	return 0;
268 }
269 
270 static const struct snd_pcm_ops snd_solo_pcm_ops = {
271 	.open = snd_solo_pcm_open,
272 	.close = snd_solo_pcm_close,
273 	.ioctl = snd_pcm_lib_ioctl,
274 	.hw_params = snd_solo_hw_params,
275 	.hw_free = snd_solo_hw_free,
276 	.prepare = snd_solo_pcm_prepare,
277 	.trigger = snd_solo_pcm_trigger,
278 	.pointer = snd_solo_pcm_pointer,
279 	.copy_user = snd_solo_pcm_copy_user,
280 	.copy_kernel = snd_solo_pcm_copy_kernel,
281 };
282 
283 static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
284 					struct snd_ctl_elem_info *info)
285 {
286 	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
287 	info->count = 1;
288 	info->value.integer.min = 0;
289 	info->value.integer.max = 15;
290 	info->value.integer.step = 1;
291 
292 	return 0;
293 }
294 
295 static int snd_solo_capture_volume_get(struct snd_kcontrol *kcontrol,
296 				       struct snd_ctl_elem_value *value)
297 {
298 	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
299 	u8 ch = value->id.numid - 1;
300 
301 	value->value.integer.value[0] = tw28_get_audio_gain(solo_dev, ch);
302 
303 	return 0;
304 }
305 
306 static int snd_solo_capture_volume_put(struct snd_kcontrol *kcontrol,
307 				       struct snd_ctl_elem_value *value)
308 {
309 	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
310 	u8 ch = value->id.numid - 1;
311 	u8 old_val;
312 
313 	old_val = tw28_get_audio_gain(solo_dev, ch);
314 	if (old_val == value->value.integer.value[0])
315 		return 0;
316 
317 	tw28_set_audio_gain(solo_dev, ch, value->value.integer.value[0]);
318 
319 	return 1;
320 }
321 
322 static const struct snd_kcontrol_new snd_solo_capture_volume = {
323 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
324 	.name = "Capture Volume",
325 	.info = snd_solo_capture_volume_info,
326 	.get = snd_solo_capture_volume_get,
327 	.put = snd_solo_capture_volume_put,
328 };
329 
330 static int solo_snd_pcm_init(struct solo_dev *solo_dev)
331 {
332 	struct snd_card *card = solo_dev->snd_card;
333 	struct snd_pcm *pcm;
334 	struct snd_pcm_substream *ss;
335 	int ret;
336 	int i;
337 
338 	ret = snd_pcm_new(card, card->driver, 0, 0, solo_dev->nr_chans,
339 			  &pcm);
340 	if (ret < 0)
341 		return ret;
342 
343 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
344 			&snd_solo_pcm_ops);
345 
346 	snd_pcm_chip(pcm) = solo_dev;
347 	pcm->info_flags = 0;
348 	strscpy(pcm->name, card->shortname, sizeof(pcm->name));
349 
350 	for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
351 	     ss; ss = ss->next, i++)
352 		sprintf(ss->name, "Camera #%d Audio", i);
353 
354 	snd_pcm_lib_preallocate_pages_for_all(pcm,
355 					SNDRV_DMA_TYPE_CONTINUOUS,
356 					snd_dma_continuous_data(GFP_KERNEL),
357 					G723_PERIOD_BYTES * PERIODS,
358 					G723_PERIOD_BYTES * PERIODS);
359 
360 	solo_dev->snd_pcm = pcm;
361 
362 	return 0;
363 }
364 
365 int solo_g723_init(struct solo_dev *solo_dev)
366 {
367 	static struct snd_device_ops ops = { };
368 	struct snd_card *card;
369 	struct snd_kcontrol_new kctl;
370 	char name[32];
371 	int ret;
372 
373 	atomic_set(&solo_dev->snd_users, 0);
374 
375 	/* Allows for easier mapping between video and audio */
376 	sprintf(name, "Softlogic%d", solo_dev->vfd->num);
377 
378 	ret = snd_card_new(&solo_dev->pdev->dev,
379 			   SNDRV_DEFAULT_IDX1, name, THIS_MODULE, 0,
380 			   &solo_dev->snd_card);
381 	if (ret < 0)
382 		return ret;
383 
384 	card = solo_dev->snd_card;
385 
386 	strscpy(card->driver, SOLO6X10_NAME, sizeof(card->driver));
387 	strscpy(card->shortname, "SOLO-6x10 Audio", sizeof(card->shortname));
388 	sprintf(card->longname, "%s on %s IRQ %d", card->shortname,
389 		pci_name(solo_dev->pdev), solo_dev->pdev->irq);
390 
391 	ret = snd_device_new(card, SNDRV_DEV_LOWLEVEL, solo_dev, &ops);
392 	if (ret < 0)
393 		goto snd_error;
394 
395 	/* Mixer controls */
396 	strscpy(card->mixername, "SOLO-6x10", sizeof(card->mixername));
397 	kctl = snd_solo_capture_volume;
398 	kctl.count = solo_dev->nr_chans;
399 
400 	ret = snd_ctl_add(card, snd_ctl_new1(&kctl, solo_dev));
401 	if (ret < 0)
402 		return ret;
403 
404 	ret = solo_snd_pcm_init(solo_dev);
405 	if (ret < 0)
406 		goto snd_error;
407 
408 	ret = snd_card_register(card);
409 	if (ret < 0)
410 		goto snd_error;
411 
412 	solo_g723_config(solo_dev);
413 
414 	dev_info(&solo_dev->pdev->dev, "Alsa sound card as %s\n", name);
415 
416 	return 0;
417 
418 snd_error:
419 	snd_card_free(card);
420 	return ret;
421 }
422 
423 void solo_g723_exit(struct solo_dev *solo_dev)
424 {
425 	if (!solo_dev->snd_card)
426 		return;
427 
428 	solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL, 0);
429 	solo_irq_off(solo_dev, SOLO_IRQ_G723);
430 
431 	snd_card_free(solo_dev->snd_card);
432 	solo_dev->snd_card = NULL;
433 }
434