1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2010-2013 Bluecherry, LLC <https://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
45struct 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
53static 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
76void 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
100static const struct snd_pcm_hardware snd_solo_pcm_hw = {
101	.info			= (SNDRV_PCM_INFO_MMAP |
102				   SNDRV_PCM_INFO_INTERLEAVED |
103				   SNDRV_PCM_INFO_BLOCK_TRANSFER |
104				   SNDRV_PCM_INFO_MMAP_VALID),
105	.formats		= SNDRV_PCM_FMTBIT_U8,
106	.rates			= SNDRV_PCM_RATE_8000,
107	.rate_min		= SAMPLERATE,
108	.rate_max		= SAMPLERATE,
109	.channels_min		= 1,
110	.channels_max		= 1,
111	.buffer_bytes_max	= G723_PERIOD_BYTES * PERIODS,
112	.period_bytes_min	= G723_PERIOD_BYTES,
113	.period_bytes_max	= G723_PERIOD_BYTES,
114	.periods_min		= PERIODS,
115	.periods_max		= PERIODS,
116};
117
118static int snd_solo_pcm_open(struct snd_pcm_substream *ss)
119{
120	struct solo_dev *solo_dev = snd_pcm_substream_chip(ss);
121	struct solo_snd_pcm *solo_pcm;
122
123	solo_pcm = kzalloc(sizeof(*solo_pcm), GFP_KERNEL);
124	if (solo_pcm == NULL)
125		goto oom;
126
127	solo_pcm->g723_buf = dma_alloc_coherent(&solo_dev->pdev->dev,
128						G723_PERIOD_BYTES,
129						&solo_pcm->g723_dma,
130						GFP_KERNEL);
131	if (solo_pcm->g723_buf == NULL)
132		goto oom;
133
134	spin_lock_init(&solo_pcm->lock);
135	solo_pcm->solo_dev = solo_dev;
136	ss->runtime->hw = snd_solo_pcm_hw;
137
138	snd_pcm_substream_chip(ss) = solo_pcm;
139
140	return 0;
141
142oom:
143	kfree(solo_pcm);
144	return -ENOMEM;
145}
146
147static int snd_solo_pcm_close(struct snd_pcm_substream *ss)
148{
149	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
150
151	snd_pcm_substream_chip(ss) = solo_pcm->solo_dev;
152	dma_free_coherent(&solo_pcm->solo_dev->pdev->dev, G723_PERIOD_BYTES,
153			  solo_pcm->g723_buf, solo_pcm->g723_dma);
154	kfree(solo_pcm);
155
156	return 0;
157}
158
159static int snd_solo_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
160{
161	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
162	struct solo_dev *solo_dev = solo_pcm->solo_dev;
163	int ret = 0;
164
165	spin_lock(&solo_pcm->lock);
166
167	switch (cmd) {
168	case SNDRV_PCM_TRIGGER_START:
169		if (solo_pcm->on == 0) {
170			/* If this is the first user, switch on interrupts */
171			if (atomic_inc_return(&solo_dev->snd_users) == 1)
172				solo_irq_on(solo_dev, SOLO_IRQ_G723);
173			solo_pcm->on = 1;
174		}
175		break;
176	case SNDRV_PCM_TRIGGER_STOP:
177		if (solo_pcm->on) {
178			/* If this was our last user, switch them off */
179			if (atomic_dec_return(&solo_dev->snd_users) == 0)
180				solo_irq_off(solo_dev, SOLO_IRQ_G723);
181			solo_pcm->on = 0;
182		}
183		break;
184	default:
185		ret = -EINVAL;
186	}
187
188	spin_unlock(&solo_pcm->lock);
189
190	return ret;
191}
192
193static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
194{
195	return 0;
196}
197
198static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
199{
200	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
201	struct solo_dev *solo_dev = solo_pcm->solo_dev;
202	snd_pcm_uframes_t idx = solo_reg_read(solo_dev, SOLO_AUDIO_STA) & 0x1f;
203
204	return idx * G723_FRAMES_PER_PAGE;
205}
206
207static int snd_solo_pcm_copy(struct snd_pcm_substream *ss, int channel,
208			     unsigned long pos, struct iov_iter *dst,
209			     unsigned long count)
210{
211	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
212	struct solo_dev *solo_dev = solo_pcm->solo_dev;
213	int err, i;
214
215	for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
216		int page = (pos / G723_FRAMES_PER_PAGE) + i;
217
218		err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
219				     SOLO_G723_EXT_ADDR(solo_dev) +
220				     (page * G723_PERIOD_BLOCK) +
221				     (ss->number * G723_PERIOD_BYTES),
222				     G723_PERIOD_BYTES, 0, 0);
223		if (err)
224			return err;
225
226		if (copy_to_iter(solo_pcm->g723_buf, G723_PERIOD_BYTES, dst) !=
227		    G723_PERIOD_BYTES)
228			return -EFAULT;
229	}
230
231	return 0;
232}
233
234static const struct snd_pcm_ops snd_solo_pcm_ops = {
235	.open = snd_solo_pcm_open,
236	.close = snd_solo_pcm_close,
237	.prepare = snd_solo_pcm_prepare,
238	.trigger = snd_solo_pcm_trigger,
239	.pointer = snd_solo_pcm_pointer,
240	.copy = snd_solo_pcm_copy,
241};
242
243static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
244					struct snd_ctl_elem_info *info)
245{
246	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
247	info->count = 1;
248	info->value.integer.min = 0;
249	info->value.integer.max = 15;
250	info->value.integer.step = 1;
251
252	return 0;
253}
254
255static int snd_solo_capture_volume_get(struct snd_kcontrol *kcontrol,
256				       struct snd_ctl_elem_value *value)
257{
258	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
259	u8 ch = value->id.numid - 1;
260
261	value->value.integer.value[0] = tw28_get_audio_gain(solo_dev, ch);
262
263	return 0;
264}
265
266static int snd_solo_capture_volume_put(struct snd_kcontrol *kcontrol,
267				       struct snd_ctl_elem_value *value)
268{
269	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
270	u8 ch = value->id.numid - 1;
271	u8 old_val;
272
273	old_val = tw28_get_audio_gain(solo_dev, ch);
274	if (old_val == value->value.integer.value[0])
275		return 0;
276
277	tw28_set_audio_gain(solo_dev, ch, value->value.integer.value[0]);
278
279	return 1;
280}
281
282static const struct snd_kcontrol_new snd_solo_capture_volume = {
283	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
284	.name = "Capture Volume",
285	.info = snd_solo_capture_volume_info,
286	.get = snd_solo_capture_volume_get,
287	.put = snd_solo_capture_volume_put,
288};
289
290static int solo_snd_pcm_init(struct solo_dev *solo_dev)
291{
292	struct snd_card *card = solo_dev->snd_card;
293	struct snd_pcm *pcm;
294	struct snd_pcm_substream *ss;
295	int ret;
296	int i;
297
298	ret = snd_pcm_new(card, card->driver, 0, 0, solo_dev->nr_chans,
299			  &pcm);
300	if (ret < 0)
301		return ret;
302
303	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
304			&snd_solo_pcm_ops);
305
306	snd_pcm_chip(pcm) = solo_dev;
307	pcm->info_flags = 0;
308	strscpy(pcm->name, card->shortname, sizeof(pcm->name));
309
310	for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
311	     ss; ss = ss->next, i++)
312		sprintf(ss->name, "Camera #%d Audio", i);
313
314	snd_pcm_set_managed_buffer_all(pcm,
315				       SNDRV_DMA_TYPE_CONTINUOUS,
316				       NULL,
317				       G723_PERIOD_BYTES * PERIODS,
318				       G723_PERIOD_BYTES * PERIODS);
319
320	solo_dev->snd_pcm = pcm;
321
322	return 0;
323}
324
325int solo_g723_init(struct solo_dev *solo_dev)
326{
327	static struct snd_device_ops ops = { };
328	struct snd_card *card;
329	struct snd_kcontrol_new kctl;
330	char name[32];
331	int ret;
332
333	atomic_set(&solo_dev->snd_users, 0);
334
335	/* Allows for easier mapping between video and audio */
336	sprintf(name, "Softlogic%d", solo_dev->vfd->num);
337
338	ret = snd_card_new(&solo_dev->pdev->dev,
339			   SNDRV_DEFAULT_IDX1, name, THIS_MODULE, 0,
340			   &solo_dev->snd_card);
341	if (ret < 0)
342		return ret;
343
344	card = solo_dev->snd_card;
345
346	strscpy(card->driver, SOLO6X10_NAME, sizeof(card->driver));
347	strscpy(card->shortname, "SOLO-6x10 Audio", sizeof(card->shortname));
348	sprintf(card->longname, "%s on %s IRQ %d", card->shortname,
349		pci_name(solo_dev->pdev), solo_dev->pdev->irq);
350
351	ret = snd_device_new(card, SNDRV_DEV_LOWLEVEL, solo_dev, &ops);
352	if (ret < 0)
353		goto snd_error;
354
355	/* Mixer controls */
356	strscpy(card->mixername, "SOLO-6x10", sizeof(card->mixername));
357	kctl = snd_solo_capture_volume;
358	kctl.count = solo_dev->nr_chans;
359
360	ret = snd_ctl_add(card, snd_ctl_new1(&kctl, solo_dev));
361	if (ret < 0)
362		goto snd_error;
363
364	ret = solo_snd_pcm_init(solo_dev);
365	if (ret < 0)
366		goto snd_error;
367
368	ret = snd_card_register(card);
369	if (ret < 0)
370		goto snd_error;
371
372	solo_g723_config(solo_dev);
373
374	dev_info(&solo_dev->pdev->dev, "Alsa sound card as %s\n", name);
375
376	return 0;
377
378snd_error:
379	snd_card_free(card);
380	return ret;
381}
382
383void solo_g723_exit(struct solo_dev *solo_dev)
384{
385	if (!solo_dev->snd_card)
386		return;
387
388	solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL, 0);
389	solo_irq_off(solo_dev, SOLO_IRQ_G723);
390
391	snd_card_free(solo_dev->snd_card);
392	solo_dev->snd_card = NULL;
393}
394