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
54struct 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
62static 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
85void 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
109static 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
115static int snd_solo_hw_free(struct snd_pcm_substream *ss)
116{
117	return snd_pcm_lib_free_pages(ss);
118}
119
120static 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
138static 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
161oom:
162	kfree(solo_pcm);
163	return -ENOMEM;
164}
165
166static 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
178static 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
212static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
213{
214	return 0;
215}
216
217static 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
226static int snd_solo_pcm_copy(struct snd_pcm_substream *ss, int channel,
227			     snd_pcm_uframes_t pos, void __user *dst,
228			     snd_pcm_uframes_t 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		err = copy_to_user(dst + (i * G723_PERIOD_BYTES),
246				   solo_pcm->g723_buf, G723_PERIOD_BYTES);
247
248		if (err)
249			return -EFAULT;
250	}
251
252	return 0;
253}
254
255static struct snd_pcm_ops snd_solo_pcm_ops = {
256	.open = snd_solo_pcm_open,
257	.close = snd_solo_pcm_close,
258	.ioctl = snd_pcm_lib_ioctl,
259	.hw_params = snd_solo_hw_params,
260	.hw_free = snd_solo_hw_free,
261	.prepare = snd_solo_pcm_prepare,
262	.trigger = snd_solo_pcm_trigger,
263	.pointer = snd_solo_pcm_pointer,
264	.copy = snd_solo_pcm_copy,
265};
266
267static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
268					struct snd_ctl_elem_info *info)
269{
270	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
271	info->count = 1;
272	info->value.integer.min = 0;
273	info->value.integer.max = 15;
274	info->value.integer.step = 1;
275
276	return 0;
277}
278
279static int snd_solo_capture_volume_get(struct snd_kcontrol *kcontrol,
280				       struct snd_ctl_elem_value *value)
281{
282	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
283	u8 ch = value->id.numid - 1;
284
285	value->value.integer.value[0] = tw28_get_audio_gain(solo_dev, ch);
286
287	return 0;
288}
289
290static int snd_solo_capture_volume_put(struct snd_kcontrol *kcontrol,
291				       struct snd_ctl_elem_value *value)
292{
293	struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
294	u8 ch = value->id.numid - 1;
295	u8 old_val;
296
297	old_val = tw28_get_audio_gain(solo_dev, ch);
298	if (old_val == value->value.integer.value[0])
299		return 0;
300
301	tw28_set_audio_gain(solo_dev, ch, value->value.integer.value[0]);
302
303	return 1;
304}
305
306static struct snd_kcontrol_new snd_solo_capture_volume = {
307	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
308	.name = "Capture Volume",
309	.info = snd_solo_capture_volume_info,
310	.get = snd_solo_capture_volume_get,
311	.put = snd_solo_capture_volume_put,
312};
313
314static int solo_snd_pcm_init(struct solo_dev *solo_dev)
315{
316	struct snd_card *card = solo_dev->snd_card;
317	struct snd_pcm *pcm;
318	struct snd_pcm_substream *ss;
319	int ret;
320	int i;
321
322	ret = snd_pcm_new(card, card->driver, 0, 0, solo_dev->nr_chans,
323			  &pcm);
324	if (ret < 0)
325		return ret;
326
327	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
328			&snd_solo_pcm_ops);
329
330	snd_pcm_chip(pcm) = solo_dev;
331	pcm->info_flags = 0;
332	strcpy(pcm->name, card->shortname);
333
334	for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
335	     ss; ss = ss->next, i++)
336		sprintf(ss->name, "Camera #%d Audio", i);
337
338	ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
339					SNDRV_DMA_TYPE_CONTINUOUS,
340					snd_dma_continuous_data(GFP_KERNEL),
341					G723_PERIOD_BYTES * PERIODS,
342					G723_PERIOD_BYTES * PERIODS);
343	if (ret < 0)
344		return ret;
345
346	solo_dev->snd_pcm = pcm;
347
348	return 0;
349}
350
351int solo_g723_init(struct solo_dev *solo_dev)
352{
353	static struct snd_device_ops ops = { NULL };
354	struct snd_card *card;
355	struct snd_kcontrol_new kctl;
356	char name[32];
357	int ret;
358
359	atomic_set(&solo_dev->snd_users, 0);
360
361	/* Allows for easier mapping between video and audio */
362	sprintf(name, "Softlogic%d", solo_dev->vfd->num);
363
364	ret = snd_card_new(&solo_dev->pdev->dev,
365			   SNDRV_DEFAULT_IDX1, name, THIS_MODULE, 0,
366			   &solo_dev->snd_card);
367	if (ret < 0)
368		return ret;
369
370	card = solo_dev->snd_card;
371
372	strcpy(card->driver, SOLO6X10_NAME);
373	strcpy(card->shortname, "SOLO-6x10 Audio");
374	sprintf(card->longname, "%s on %s IRQ %d", card->shortname,
375		pci_name(solo_dev->pdev), solo_dev->pdev->irq);
376
377	ret = snd_device_new(card, SNDRV_DEV_LOWLEVEL, solo_dev, &ops);
378	if (ret < 0)
379		goto snd_error;
380
381	/* Mixer controls */
382	strcpy(card->mixername, "SOLO-6x10");
383	kctl = snd_solo_capture_volume;
384	kctl.count = solo_dev->nr_chans;
385
386	ret = snd_ctl_add(card, snd_ctl_new1(&kctl, solo_dev));
387	if (ret < 0)
388		return ret;
389
390	ret = solo_snd_pcm_init(solo_dev);
391	if (ret < 0)
392		goto snd_error;
393
394	ret = snd_card_register(card);
395	if (ret < 0)
396		goto snd_error;
397
398	solo_g723_config(solo_dev);
399
400	dev_info(&solo_dev->pdev->dev, "Alsa sound card as %s\n", name);
401
402	return 0;
403
404snd_error:
405	snd_card_free(card);
406	return ret;
407}
408
409void solo_g723_exit(struct solo_dev *solo_dev)
410{
411	if (!solo_dev->snd_card)
412		return;
413
414	solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL, 0);
415	solo_irq_off(solo_dev, SOLO_IRQ_G723);
416
417	snd_card_free(solo_dev->snd_card);
418	solo_dev->snd_card = NULL;
419}
420