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
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
solo_g723_config(struct solo_dev * solo_dev)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
solo_g723_isr(struct solo_dev * solo_dev)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 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
snd_solo_pcm_open(struct snd_pcm_substream * ss)118 static 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
142 oom:
143 kfree(solo_pcm);
144 return -ENOMEM;
145 }
146
snd_solo_pcm_close(struct snd_pcm_substream * ss)147 static 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
snd_solo_pcm_trigger(struct snd_pcm_substream * ss,int cmd)159 static 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
snd_solo_pcm_prepare(struct snd_pcm_substream * ss)193 static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
194 {
195 return 0;
196 }
197
snd_solo_pcm_pointer(struct snd_pcm_substream * ss)198 static 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
snd_solo_pcm_copy(struct snd_pcm_substream * ss,int channel,unsigned long pos,struct iov_iter * dst,unsigned long count)207 static 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
234 static 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
snd_solo_capture_volume_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * info)243 static 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
snd_solo_capture_volume_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * value)255 static 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
snd_solo_capture_volume_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * value)266 static 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
282 static 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
solo_snd_pcm_init(struct solo_dev * solo_dev)290 static 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
solo_g723_init(struct solo_dev * solo_dev)325 int 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
378 snd_error:
379 snd_card_free(card);
380 return ret;
381 }
382
solo_g723_exit(struct solo_dev * solo_dev)383 void 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