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  */
pdacf_pcm_clear_sram(struct snd_pdacf * chip)19 static 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  */
pdacf_pcm_trigger(struct snd_pcm_substream * subs,int cmd)34 static 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 	mutex_lock(&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 			goto __end;
75 		}
76 	}
77 	tmp &= ~mask;
78 	tmp |= val;
79 	pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, tmp);
80       __end:
81 	mutex_unlock(&chip->reg_lock);
82 	snd_ak4117_check_rate_and_errors(chip->ak4117, AK4117_CHECK_NO_RATE);
83 	return ret;
84 }
85 
86 /*
87  * pdacf_pcm_prepare - prepare callback for playback and capture
88  */
pdacf_pcm_prepare(struct snd_pcm_substream * subs)89 static int pdacf_pcm_prepare(struct snd_pcm_substream *subs)
90 {
91 	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
92 	struct snd_pcm_runtime *runtime = subs->runtime;
93 	u16 val, nval, aval;
94 
95 	if (chip->chip_status & PDAUDIOCF_STAT_IS_STALE)
96 		return -EBUSY;
97 
98 	chip->pcm_channels = runtime->channels;
99 
100 	chip->pcm_little = snd_pcm_format_little_endian(runtime->format) > 0;
101 #ifdef SNDRV_LITTLE_ENDIAN
102 	chip->pcm_swab = snd_pcm_format_big_endian(runtime->format) > 0;
103 #else
104 	chip->pcm_swab = chip->pcm_little;
105 #endif
106 
107 	if (snd_pcm_format_unsigned(runtime->format))
108 		chip->pcm_xor = 0x80008000;
109 
110 	if (pdacf_pcm_clear_sram(chip) < 0)
111 		return -EIO;
112 
113 	val = nval = pdacf_reg_read(chip, PDAUDIOCF_REG_SCR);
114 	nval &= ~(PDAUDIOCF_DATAFMT0|PDAUDIOCF_DATAFMT1);
115 	switch (runtime->format) {
116 	case SNDRV_PCM_FORMAT_S16_LE:
117 	case SNDRV_PCM_FORMAT_S16_BE:
118 		break;
119 	default: /* 24-bit */
120 		nval |= PDAUDIOCF_DATAFMT0 | PDAUDIOCF_DATAFMT1;
121 		break;
122 	}
123 	aval = 0;
124 	chip->pcm_sample = 4;
125 	switch (runtime->format) {
126 	case SNDRV_PCM_FORMAT_S16_LE:
127 	case SNDRV_PCM_FORMAT_S16_BE:
128 		aval = AK4117_DIF_16R;
129 		chip->pcm_frame = 2;
130 		chip->pcm_sample = 2;
131 		break;
132 	case SNDRV_PCM_FORMAT_S24_3LE:
133 	case SNDRV_PCM_FORMAT_S24_3BE:
134 		chip->pcm_sample = 3;
135 		fallthrough;
136 	default: /* 24-bit */
137 		aval = AK4117_DIF_24R;
138 		chip->pcm_frame = 3;
139 		chip->pcm_xor &= 0xffff0000;
140 		break;
141 	}
142 
143 	if (val != nval) {
144 		snd_ak4117_reg_write(chip->ak4117, AK4117_REG_IO, AK4117_DIF2|AK4117_DIF1|AK4117_DIF0, aval);
145 		pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, nval);
146 	}
147 
148 	val = pdacf_reg_read(chip,  PDAUDIOCF_REG_IER);
149 	val &= ~(PDAUDIOCF_IRQLVLEN1);
150 	val |= PDAUDIOCF_IRQLVLEN0;
151 	pdacf_reg_write(chip, PDAUDIOCF_REG_IER, val);
152 
153 	chip->pcm_size = runtime->buffer_size;
154 	chip->pcm_period = runtime->period_size;
155 	chip->pcm_area = runtime->dma_area;
156 
157 	return 0;
158 }
159 
160 
161 /*
162  * capture hw information
163  */
164 
165 static const struct snd_pcm_hardware pdacf_pcm_capture_hw = {
166 	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
167 				 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
168 				 SNDRV_PCM_INFO_MMAP_VALID |
169 				 SNDRV_PCM_INFO_BATCH),
170 	.formats =		SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
171 				SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |
172 				SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE,
173 	.rates =		SNDRV_PCM_RATE_32000 |
174 				SNDRV_PCM_RATE_44100 |
175 				SNDRV_PCM_RATE_48000 |
176 				SNDRV_PCM_RATE_88200 |
177 				SNDRV_PCM_RATE_96000 |
178 				SNDRV_PCM_RATE_176400 |
179 				SNDRV_PCM_RATE_192000,
180 	.rate_min =		32000,
181 	.rate_max =		192000,
182 	.channels_min =		1,
183 	.channels_max =		2,
184 	.buffer_bytes_max =	(512*1024),
185 	.period_bytes_min =	8*1024,
186 	.period_bytes_max =	(64*1024),
187 	.periods_min =		2,
188 	.periods_max =		128,
189 	.fifo_size =		0,
190 };
191 
192 
193 /*
194  * pdacf_pcm_capture_open - open callback for capture
195  */
pdacf_pcm_capture_open(struct snd_pcm_substream * subs)196 static int pdacf_pcm_capture_open(struct snd_pcm_substream *subs)
197 {
198 	struct snd_pcm_runtime *runtime = subs->runtime;
199 	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
200 
201 	if (chip->chip_status & PDAUDIOCF_STAT_IS_STALE)
202 		return -EBUSY;
203 
204 	runtime->hw = pdacf_pcm_capture_hw;
205 	runtime->private_data = chip;
206 	chip->pcm_substream = subs;
207 
208 	return 0;
209 }
210 
211 /*
212  * pdacf_pcm_capture_close - close callback for capture
213  */
pdacf_pcm_capture_close(struct snd_pcm_substream * subs)214 static int pdacf_pcm_capture_close(struct snd_pcm_substream *subs)
215 {
216 	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
217 
218 	if (!chip)
219 		return -EINVAL;
220 	pdacf_reinit(chip, 0);
221 	chip->pcm_substream = NULL;
222 	return 0;
223 }
224 
225 
226 /*
227  * pdacf_pcm_capture_pointer - pointer callback for capture
228  */
pdacf_pcm_capture_pointer(struct snd_pcm_substream * subs)229 static snd_pcm_uframes_t pdacf_pcm_capture_pointer(struct snd_pcm_substream *subs)
230 {
231 	struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
232 	return chip->pcm_hwptr;
233 }
234 
235 /*
236  * operators for PCM capture
237  */
238 static const struct snd_pcm_ops pdacf_pcm_capture_ops = {
239 	.open =		pdacf_pcm_capture_open,
240 	.close =	pdacf_pcm_capture_close,
241 	.prepare =	pdacf_pcm_prepare,
242 	.trigger =	pdacf_pcm_trigger,
243 	.pointer =	pdacf_pcm_capture_pointer,
244 };
245 
246 
247 /*
248  * snd_pdacf_pcm_new - create and initialize a pcm
249  */
snd_pdacf_pcm_new(struct snd_pdacf * chip)250 int snd_pdacf_pcm_new(struct snd_pdacf *chip)
251 {
252 	struct snd_pcm *pcm;
253 	int err;
254 
255 	err = snd_pcm_new(chip->card, "PDAudioCF", 0, 0, 1, &pcm);
256 	if (err < 0)
257 		return err;
258 
259 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pdacf_pcm_capture_ops);
260 	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL,
261 				       0, 0);
262 
263 	pcm->private_data = chip;
264 	pcm->info_flags = 0;
265 	pcm->nonatomic = true;
266 	strcpy(pcm->name, chip->card->shortname);
267 	chip->pcm = pcm;
268 
269 	err = snd_ak4117_build(chip->ak4117, pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream);
270 	if (err < 0)
271 		return err;
272 
273 	return 0;
274 }
275