pdaudiocf_pcm.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Driver for Sound Core PDAudioCF soundcards
  4 *
  5 * PCM part
  6 *
  7 * Copyright (c) 2003 by Jaroslav Kysela <perex@perex.cz>
  8 */
  9
 10#include <linux/delay.h>
 11#include <sound/core.h>
 12#include <sound/asoundef.h>
 13#include "pdaudiocf.h"
 14
 15
 16/*
 17 * clear the SRAM contents
 18 */
 19static int pdacf_pcm_clear_sram(struct snd_pdacf *chip)
 20{
 21	int max_loop = 64 * 1024;
 22
 23	while (inw(chip->port + PDAUDIOCF_REG_RDP) != inw(chip->port + PDAUDIOCF_REG_WDP)) {
 24		if (max_loop-- < 0)
 25			return -EIO;
 26		inw(chip->port + PDAUDIOCF_REG_MD);
 27	}
 28	return 0;
 29}
 30
 31/*
 32 * pdacf_pcm_trigger - trigger callback for capture
 33 */
 34static int pdacf_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
 35{
 36	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
 37	struct snd_pcm_runtime *runtime = subs->runtime;
 38	int inc, ret = 0, rate;
 39	unsigned short mask, val, tmp;
 40
 41	if (chip->chip_status & PDAUDIOCF_STAT_IS_STALE)
 42		return -EBUSY;
 43
 44	switch (cmd) {
 45	case SNDRV_PCM_TRIGGER_START:
 46		chip->pcm_hwptr = 0;
 47		chip->pcm_tdone = 0;
 48		fallthrough;
 49	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 50	case SNDRV_PCM_TRIGGER_RESUME:
 51		mask = 0;
 52		val = PDAUDIOCF_RECORD;
 53		inc = 1;
 54		rate = snd_ak4117_check_rate_and_errors(chip->ak4117, AK4117_CHECK_NO_STAT|AK4117_CHECK_NO_RATE);
 55		break;
 56	case SNDRV_PCM_TRIGGER_STOP:
 57	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 58	case SNDRV_PCM_TRIGGER_SUSPEND:
 59		mask = PDAUDIOCF_RECORD;
 60		val = 0;
 61		inc = -1;
 62		rate = 0;
 63		break;
 64	default:
 65		return -EINVAL;
 66	}
 67	scoped_guard(mutex, &chip->reg_lock) {
 68		chip->pcm_running += inc;
 69		tmp = pdacf_reg_read(chip, PDAUDIOCF_REG_SCR);
 70		if (chip->pcm_running) {
 71			if ((chip->ak4117->rcs0 & AK4117_UNLCK) || runtime->rate != rate) {
 72				chip->pcm_running -= inc;
 73				ret = -EIO;
 74				break;
 75			}
 76		}
 77		tmp &= ~mask;
 78		tmp |= val;
 79		pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, tmp);
 80	}
 81	snd_ak4117_check_rate_and_errors(chip->ak4117, AK4117_CHECK_NO_RATE);
 82	return ret;
 83}
 84
 85/*
 86 * pdacf_pcm_prepare - prepare callback for playback and capture
 87 */
 88static int pdacf_pcm_prepare(struct snd_pcm_substream *subs)
 89{
 90	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
 91	struct snd_pcm_runtime *runtime = subs->runtime;
 92	u16 val, nval, aval;
 93
 94	if (chip->chip_status & PDAUDIOCF_STAT_IS_STALE)
 95		return -EBUSY;
 96
 97	chip->pcm_channels = runtime->channels;
 98
 99	chip->pcm_little = snd_pcm_format_little_endian(runtime->format) > 0;
100#ifdef SNDRV_LITTLE_ENDIAN
101	chip->pcm_swab = snd_pcm_format_big_endian(runtime->format) > 0;
102#else
103	chip->pcm_swab = chip->pcm_little;
104#endif
105
106	if (snd_pcm_format_unsigned(runtime->format))
107		chip->pcm_xor = 0x80008000;
108
109	if (pdacf_pcm_clear_sram(chip) < 0)
110		return -EIO;
111	
112	val = nval = pdacf_reg_read(chip, PDAUDIOCF_REG_SCR);
113	nval &= ~(PDAUDIOCF_DATAFMT0|PDAUDIOCF_DATAFMT1);
114	switch (runtime->format) {
115	case SNDRV_PCM_FORMAT_S16_LE:
116	case SNDRV_PCM_FORMAT_S16_BE:
117		break;
118	default: /* 24-bit */
119		nval |= PDAUDIOCF_DATAFMT0 | PDAUDIOCF_DATAFMT1;
120		break;
121	}
122	aval = 0;
123	chip->pcm_sample = 4;
124	switch (runtime->format) {
125	case SNDRV_PCM_FORMAT_S16_LE:
126	case SNDRV_PCM_FORMAT_S16_BE:
127		aval = AK4117_DIF_16R;
128		chip->pcm_frame = 2;
129		chip->pcm_sample = 2;
130		break;
131	case SNDRV_PCM_FORMAT_S24_3LE:
132	case SNDRV_PCM_FORMAT_S24_3BE:
133		chip->pcm_sample = 3;
134		fallthrough;
135	default: /* 24-bit */
136		aval = AK4117_DIF_24R;
137		chip->pcm_frame = 3;
138		chip->pcm_xor &= 0xffff0000;
139		break;
140	}
141
142	if (val != nval) {
143		snd_ak4117_reg_write(chip->ak4117, AK4117_REG_IO, AK4117_DIF2|AK4117_DIF1|AK4117_DIF0, aval);
144		pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, nval);
145	}
146
147	val = pdacf_reg_read(chip,  PDAUDIOCF_REG_IER);
148	val &= ~(PDAUDIOCF_IRQLVLEN1);
149	val |= PDAUDIOCF_IRQLVLEN0;
150	pdacf_reg_write(chip, PDAUDIOCF_REG_IER, val);
151
152	chip->pcm_size = runtime->buffer_size;
153	chip->pcm_period = runtime->period_size;
154	chip->pcm_area = runtime->dma_area;
155
156	return 0;
157}
158
159
160/*
161 * capture hw information
162 */
163
164static const struct snd_pcm_hardware pdacf_pcm_capture_hw = {
165	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
166				 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
167				 SNDRV_PCM_INFO_MMAP_VALID |
168				 SNDRV_PCM_INFO_BATCH),
169	.formats =		SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
170				SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |
171				SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE,
172	.rates =		SNDRV_PCM_RATE_32000 |
173				SNDRV_PCM_RATE_44100 |
174				SNDRV_PCM_RATE_48000 |
175				SNDRV_PCM_RATE_88200 |
176				SNDRV_PCM_RATE_96000 |
177				SNDRV_PCM_RATE_176400 |
178				SNDRV_PCM_RATE_192000,
179	.rate_min =		32000,
180	.rate_max =		192000,
181	.channels_min =		1,
182	.channels_max =		2,
183	.buffer_bytes_max =	(512*1024),
184	.period_bytes_min =	8*1024,
185	.period_bytes_max =	(64*1024),
186	.periods_min =		2,
187	.periods_max =		128,
188	.fifo_size =		0,
189};
190
191
192/*
193 * pdacf_pcm_capture_open - open callback for capture
194 */
195static int pdacf_pcm_capture_open(struct snd_pcm_substream *subs)
196{
197	struct snd_pcm_runtime *runtime = subs->runtime;
198	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
199
200	if (chip->chip_status & PDAUDIOCF_STAT_IS_STALE)
201		return -EBUSY;
202
203	runtime->hw = pdacf_pcm_capture_hw;
204	runtime->private_data = chip;
205	chip->pcm_substream = subs;
206
207	return 0;
208}
209
210/*
211 * pdacf_pcm_capture_close - close callback for capture
212 */
213static int pdacf_pcm_capture_close(struct snd_pcm_substream *subs)
214{
215	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
216
217	if (!chip)
218		return -EINVAL;
219	pdacf_reinit(chip, 0);
220	chip->pcm_substream = NULL;
221	return 0;
222}
223
224
225/*
226 * pdacf_pcm_capture_pointer - pointer callback for capture
227 */
228static snd_pcm_uframes_t pdacf_pcm_capture_pointer(struct snd_pcm_substream *subs)
229{
230	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
231	return chip->pcm_hwptr;
232}
233
234/*
235 * operators for PCM capture
236 */
237static const struct snd_pcm_ops pdacf_pcm_capture_ops = {
238	.open =		pdacf_pcm_capture_open,
239	.close =	pdacf_pcm_capture_close,
240	.prepare =	pdacf_pcm_prepare,
241	.trigger =	pdacf_pcm_trigger,
242	.pointer =	pdacf_pcm_capture_pointer,
243};
244
245
246/*
247 * snd_pdacf_pcm_new - create and initialize a pcm
248 */
249int snd_pdacf_pcm_new(struct snd_pdacf *chip)
250{
251	struct snd_pcm *pcm;
252	int err;
253
254	err = snd_pcm_new(chip->card, "PDAudioCF", 0, 0, 1, &pcm);
255	if (err < 0)
256		return err;
257		
258	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pdacf_pcm_capture_ops);
259	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL,
260				       0, 0);
261
262	pcm->private_data = chip;
263	pcm->info_flags = 0;
264	pcm->nonatomic = true;
265	strscpy(pcm->name, chip->card->shortname);
266	chip->pcm = pcm;
267	
268	err = snd_ak4117_build(chip->ak4117, pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream);
269	if (err < 0)
270		return err;
271
272	return 0;
273}