An audio codec used in various embedded devices, has both inputs and
outputs. Mainline linux contains the driver for it in the recently
added ASOC framework. It connects to a processor through I2C (control)
and I2S (audio data).
Cheers,
Andrew
From 18bd82a9a6929fa2de39e78f4792879afb8ae087 Mon Sep 17 00:00:00 2001
From: Andrzej Zaborowski <[EMAIL PROTECTED]>
Date: Fri, 16 Mar 2007 16:47:16 +0100
Subject: [PATCH] Wolfson Microsystems WM8750 audio CODEC (i2c chip).
---
hw/i2c.h | 8 +
hw/wm8750.c | 524 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 532 insertions(+), 0 deletions(-)
diff --git a/hw/i2c.h b/hw/i2c.h
index d866f28..73e00ed 100644
--- a/hw/i2c.h
+++ b/hw/i2c.h
@@ -158,3 +158,11 @@ void max7310_reset(struct i2c_slave_s *i2c);
void max7310_gpio_set(struct i2c_slave_s *i2c, int line, int level);
void max7310_gpio_handler_set(struct i2c_slave_s *i2c, int line,
gpio_handler_t handler, void *opaque);
+
+/* wm8750.c */
+struct i2c_slave_s *wm8750_init(AudioState *audio);
+void wm8750_reset(struct i2c_slave_s *i2c);
+void wm8750_data_req_set(struct i2c_slave_s *i2c,
+ void (*data_req)(void *, int, int), void *opaque);
+void wm8750_dac_dat(void *opaque, uint32_t sample);
+uint32_t wm8750_adc_dat(void *opaque);
diff --git a/hw/wm8750.c b/hw/wm8750.c
new file mode 100644
index 0000000..baff1de
--- /dev/null
+++ b/hw/wm8750.c
@@ -0,0 +1,524 @@
+/*
+ * WM8750 audio CODEC.
+ *
+ * Copyright (c) 2006 Openedhand Ltd.
+ * Written by Andrzej Zaborowski <[EMAIL PROTECTED]>
+ *
+ * This file is licensed under GNU GPL.
+ */
+
+#include "vl.h"
+
+#define IN_PORT_N 3
+#define OUT_PORT_N 3
+
+#define CODEC "wm8750"
+
+struct wm_rate_s;
+struct wm8750_s {
+ int i2c_dir;
+ struct i2c_slave_s i2c;
+ QEMUSoundCard card;
+ SWVoiceIn *adc_voice[IN_PORT_N];
+ SWVoiceOut *dac_voice[OUT_PORT_N];
+ int enable;
+ void (*data_req)(void *, int, int);
+ void *opaque;
+ uint8_t data_in[4096];
+ uint8_t data_out[4096];
+ int idx_in, req_in;
+ int idx_out, req_out;
+
+ SWVoiceOut **out[2];
+ uint8_t outvol[7], outmute[2];
+ SWVoiceIn **in[2];
+ uint8_t invol[4], inmute[2];
+
+ uint8_t diff[2], pol, ds, monomix[2], alc, mute;
+ uint8_t path[4], mpath[2], power, format;
+ uint32_t inmask, outmask;
+ const struct wm_rate_s *rate;
+};
+
+static inline void wm8750_in_load(struct wm8750_s *s)
+{
+ int acquired;
+ if (s->idx_in + s->req_in <= sizeof(s->data_in))
+ return;
+ s->idx_in = audio_MAX(0, (int) sizeof(s->data_in) - s->req_in);
+ acquired = AUD_read(*s->in[0], s->data_in + s->idx_in,
+ sizeof(s->data_in) - s->idx_in);
+}
+
+static inline void wm8750_out_flush(struct wm8750_s *s)
+{
+ int sent;
+ if (!s->idx_out)
+ return;
+ sent = AUD_write(*s->out[0], s->data_out, s->idx_out);
+ s->idx_out = 0;
+}
+
+static void wm8750_audio_in_cb(void *opaque, int avail_b)
+{
+ struct wm8750_s *s = (struct wm8750_s *) opaque;
+ s->req_in = avail_b;
+ s->data_req(s->opaque, s->req_out >> 2, avail_b >> 2);
+
+#if 0
+ wm8750_in_load(s);
+#endif
+}
+
+static void wm8750_audio_out_cb(void *opaque, int free_b)
+{
+ struct wm8750_s *s = (struct wm8750_s *) opaque;
+ wm8750_out_flush(s);
+
+ s->req_out = free_b;
+ s->data_req(s->opaque, free_b >> 2, s->req_in >> 2);
+}
+
+struct wm_rate_s {
+ int adc;
+ int adc_hz;
+ int dac;
+ int dac_hz;
+};
+
+static const struct wm_rate_s wm_rate_table[] = {
+ { 256, 48000, 256, 48000 }, /* SR: 00000 */
+ { 384, 48000, 384, 48000 }, /* SR: 00001 */
+ { 256, 48000, 1536, 8000 }, /* SR: 00010 */
+ { 384, 48000, 2304, 8000 }, /* SR: 00011 */
+ { 1536, 8000, 256, 48000 }, /* SR: 00100 */
+ { 2304, 8000, 384, 48000 }, /* SR: 00101 */
+ { 1536, 8000, 1536, 8000 }, /* SR: 00110 */
+ { 2304, 8000, 2304, 8000 }, /* SR: 00111 */
+ { 1024, 12000, 1024, 12000 }, /* SR: 01000 */
+ { 1526, 12000, 1536, 12000 }, /* SR: 01001 */
+ { 768, 16000, 768, 16000 }, /* SR: 01010 */
+ { 1152, 16000, 1152, 16000 }, /* SR: 01011 */
+ { 384, 32000, 384, 32000 }, /* SR: 01100 */
+ { 576, 32000, 576, 32000 }, /* SR: 01101 */
+ { 128, 96000, 128, 96000 }, /* SR: 01110 */
+ { 192, 96000, 192, 96000 }, /* SR: 01111 */
+ { 256, 44100, 256, 44100 }, /* SR: 10000 */
+ { 384, 44100, 384, 44100 }, /* SR: 10001 */
+ { 256, 44100, 1408, 8018 }, /* SR: 10010 */
+ { 384, 44100, 2112, 8018 }, /* SR: 10011 */
+ { 1408, 8018, 256, 44100 }, /* SR: 10100 */
+ { 2112, 8018, 384, 44100 }, /* SR: 10101 */
+ { 1408, 8018, 1408, 8018 }, /* SR: 10110 */
+ { 2112, 8018, 2112, 8018 }, /* SR: 10111 */
+ { 1024, 11025, 1024, 11025 }, /* SR: 11000 */
+ { 1536, 11025, 1536, 11025 }, /* SR: 11001 */
+ { 512, 22050, 512, 22050 }, /* SR: 11010 */
+ { 768, 22050, 768, 22050 }, /* SR: 11011 */
+ { 512, 24000, 512, 24000 }, /* SR: 11100 */
+ { 768, 24000, 768, 24000 }, /* SR: 11101 */
+ { 128, 88200, 128, 88200 }, /* SR: 11110 */
+ { 192, 88200, 128, 88200 }, /* SR: 11111 */
+};
+
+void wm8750_set_format(struct wm8750_s *s)
+{
+ int i;
+ audsettings_t in_fmt;
+ audsettings_t out_fmt;
+ audsettings_t monoout_fmt;
+
+ wm8750_out_flush(s);
+
+ if (s->in[0] && *s->in[0])
+ AUD_set_active_in(*s->in[0], 0);
+ if (s->out[0] && *s->out[0])
+ AUD_set_active_out(*s->out[0], 0);
+
+ for (i = 0; i < IN_PORT_N; i ++)
+ if (s->adc_voice[i]) {
+ AUD_close_in(&s->card, s->adc_voice[i]);
+ s->adc_voice[i] = 0;
+ }
+ for (i = 0; i < OUT_PORT_N; i ++)
+ if (s->dac_voice[i]) {
+ AUD_close_out(&s->card, s->dac_voice[i]);
+ s->dac_voice[i] = 0;
+ }
+
+ if (!s->enable)
+ return;
+
+ /* Setup input */
+ in_fmt.endianness = 0;
+ in_fmt.nchannels = 2;
+ in_fmt.freq = s->rate->adc_hz;
+ in_fmt.fmt = AUD_FMT_S16;
+
+ s->adc_voice[0] = AUD_open_in(&s->card, s->adc_voice[0],
+ CODEC ".input1", s, wm8750_audio_in_cb, &in_fmt);
+ s->adc_voice[1] = AUD_open_in(&s->card, s->adc_voice[1],
+ CODEC ".input2", s, wm8750_audio_in_cb, &in_fmt);
+ s->adc_voice[2] = AUD_open_in(&s->card, s->adc_voice[2],
+ CODEC ".input3", s, wm8750_audio_in_cb, &in_fmt);
+
+ /* Setup output */
+ out_fmt.endianness = 0;
+ out_fmt.nchannels = 2;
+ out_fmt.freq = s->rate->dac_hz;
+ out_fmt.fmt = AUD_FMT_S16;
+ monoout_fmt.endianness = 0;
+ monoout_fmt.nchannels = 1;
+ monoout_fmt.freq = s->rate->dac_hz;
+ monoout_fmt.fmt = AUD_FMT_S16;
+
+ s->dac_voice[0] = AUD_open_out(&s->card, s->dac_voice[0],
+ CODEC ".speaker", s, wm8750_audio_out_cb, &out_fmt);
+ s->dac_voice[1] = AUD_open_out(&s->card, s->dac_voice[1],
+ CODEC ".headphone", s, wm8750_audio_out_cb, &out_fmt);
+ /* MONOMIX is also in stereo for simplicity */
+ s->dac_voice[2] = AUD_open_out(&s->card, s->dac_voice[2],
+ CODEC ".monomix", s, wm8750_audio_out_cb, &out_fmt);
+ /* no sense emulating OUT3 which is a mix of other outputs */
+
+ /* We should connect the left and right channels to their
+ * respective inputs/outputs but we have completely no need
+ * for mixing or combining paths to different ports, so we
+ * connect both channels to where the left channel is routed. */
+ if (s->in[0] && *s->in[0])
+ AUD_set_active_in(*s->in[0], 1);
+ if (s->out[0] && *s->out[0])
+ AUD_set_active_out(*s->out[0], 1);
+}
+
+void inline wm8750_mask_update(struct wm8750_s *s)
+{
+#define R_ONLY 0x0000ffff
+#define L_ONLY 0xffff0000
+#define BOTH (R_ONLY | L_ONLY)
+#define NONE (R_ONLY & L_ONLY)
+ s->inmask =
+ (s->inmute[0] ? R_ONLY : BOTH) &
+ (s->inmute[1] ? L_ONLY : BOTH) &
+ (s->mute ? NONE : BOTH);
+ s->outmask =
+ (s->outmute[0] ? R_ONLY : BOTH) &
+ (s->outmute[1] ? L_ONLY : BOTH) &
+ (s->mute ? NONE : BOTH);
+}
+
+void wm8750_reset(struct i2c_slave_s *i2c)
+{
+ struct wm8750_s *s = (struct wm8750_s *) i2c->opaque;
+ s->enable = 0;
+ wm8750_set_format(s);
+ s->diff[0] = 0;
+ s->diff[1] = 0;
+ s->ds = 0;
+ s->alc = 0;
+ s->in[0] = &s->adc_voice[0];
+ s->invol[0] = 0x17;
+ s->invol[1] = 0x17;
+ s->invol[2] = 0xc3;
+ s->invol[3] = 0xc3;
+ s->out[0] = &s->dac_voice[0];
+ s->outvol[0] = 0xff;
+ s->outvol[1] = 0xff;
+ s->outvol[2] = 0x79;
+ s->outvol[3] = 0x79;
+ s->outvol[4] = 0x79;
+ s->outvol[5] = 0x79;
+ s->inmute[0] = 0;
+ s->inmute[1] = 0;
+ s->outmute[0] = 0;
+ s->outmute[1] = 0;
+ s->mute = 1;
+ s->path[0] = 0;
+ s->path[1] = 0;
+ s->path[2] = 0;
+ s->path[3] = 0;
+ s->mpath[0] = 0;
+ s->mpath[1] = 0;
+ s->format = 0x0a;
+ s->idx_in = sizeof(s->data_in);
+ s->req_in = 0;
+ s->idx_out = 0;
+ s->req_out = 0;
+ wm8750_mask_update(s);
+}
+
+static void wm8750_start(void *opaque, int dir)
+{
+ struct wm8750_s *s = (struct wm8750_s *) opaque;
+ s->i2c_dir = dir;
+}
+
+#define WM8750_LINVOL 0x00
+#define WM8750_RINVOL 0x01
+#define WM8750_LOUT1V 0x02
+#define WM8750_ROUT1V 0x03
+#define WM8750_ADCDAC 0x05
+#define WM8750_IFACE 0x07
+#define WM8750_SRATE 0x08
+#define WM8750_LDAC 0x0a
+#define WM8750_RDAC 0x0b
+#define WM8750_BASS 0x0c
+#define WM8750_TREBLE 0x0d
+#define WM8750_RESET 0x0f
+#define WM8750_3D 0x10
+#define WM8750_ALC1 0x11
+#define WM8750_ALC2 0x12
+#define WM8750_ALC3 0x13
+#define WM8750_NGATE 0x14
+#define WM8750_LADC 0x15
+#define WM8750_RADC 0x16
+#define WM8750_ADCTL1 0x17
+#define WM8750_ADCTL2 0x18
+#define WM8750_PWR1 0x19
+#define WM8750_PWR2 0x1a
+#define WM8750_ADCTL3 0x1b
+#define WM8750_ADCIN 0x1f
+#define WM8750_LADCIN 0x20
+#define WM8750_RADCIN 0x21
+#define WM8750_LOUTM1 0x22
+#define WM8750_LOUTM2 0x23
+#define WM8750_ROUTM1 0x24
+#define WM8750_ROUTM2 0x25
+#define WM8750_MOUTM1 0x26
+#define WM8750_MOUTM2 0x27
+#define WM8750_LOUT2V 0x28
+#define WM8750_ROUT2V 0x29
+#define WM8750_MOUTV 0x2a
+
+static int wm8750_tx(void *opaque, uint8_t *data, int len)
+{
+ struct wm8750_s *s = (struct wm8750_s *) opaque;
+ uint8_t cmd;
+ uint16_t value;
+
+ if (s->i2c_dir)
+ return 1;
+ if (len < 2) {
+#ifdef VERBOSE
+ printf("%s: message too short (%i bytes)\n", __FUNCTION__, len);
+#endif
+ return 0;
+ }
+ cmd = data[0] >> 1;
+ value = ((data[0] << 8) | data[1]) & 0x1ff;
+#ifdef VERBOSE
+ if (len > 2)
+ printf("%s: long message (%i bytes)\n", __FUNCTION__, len);
+#endif
+
+ switch (cmd) {
+ case WM8750_LADCIN: /* ADC Signal Path Control (Left) */
+ s->diff[0] = (((value >> 6) & 3) == 3); /* LINSEL */
+ if (s->diff[0])
+ s->in[0] = &s->adc_voice[0 + s->ds * 1];
+ else
+ s->in[0] = &s->adc_voice[((value >> 6) & 3) * 1 + 0];
+ break;
+
+ case WM8750_RADCIN: /* ADC Signal Path Control (Right) */
+ s->diff[1] = (((value >> 6) & 3) == 3); /* RINSEL */
+ if (s->diff[1])
+ s->in[1] = &s->adc_voice[0 + s->ds * 1];
+ else
+ s->in[1] = &s->adc_voice[((value >> 6) & 3) * 1 + 0];
+ break;
+
+ case WM8750_ADCIN: /* ADC Input Mode */
+ s->ds = (value >> 8) & 1; /* DS */
+ if (s->diff[0])
+ s->in[0] = &s->adc_voice[0 + s->ds * 1];
+ if (s->diff[1])
+ s->in[1] = &s->adc_voice[0 + s->ds * 1];
+ s->monomix[0] = (value >> 6) & 3; /* MONOMIX */
+ break;
+
+ case WM8750_ADCTL1: /* Additional Control (1) */
+ s->monomix[1] = (value >> 1) & 1; /* DMONOMIX */
+ break;
+
+ case WM8750_PWR1: /* Power Management (1) */
+ s->enable = ((value >> 6) & 7) == 3; /* VMIDSEL, VREF */
+ wm8750_set_format(s);
+ break;
+
+ case WM8750_LINVOL: /* Left Channel PGA */
+ s->invol[0] = value & 0x3f; /* LINVOL */
+ s->inmute[0] = (value >> 7) & 1; /* LINMUTE */
+ wm8750_mask_update(s);
+ break;
+
+ case WM8750_RINVOL: /* Right Channel PGA */
+ s->invol[1] = value & 0x3f; /* RINVOL */
+ s->inmute[1] = (value >> 7) & 1; /* RINMUTE */
+ wm8750_mask_update(s);
+ break;
+
+ case WM8750_ADCDAC: /* ADC and DAC Control */
+ s->pol = (value >> 5) & 3; /* ADCPOL */
+ s->mute = (value >> 3) & 1; /* DACMU */
+ wm8750_mask_update(s);
+ break;
+
+ case WM8750_ADCTL3: /* Additional Control (3) */
+ break;
+
+ case WM8750_LADC: /* Left ADC Digital Volume */
+ s->invol[2] = value & 0xff; /* LADCVOL */
+ break;
+
+ case WM8750_RADC: /* Right ADC Digital Volume */
+ s->invol[3] = value & 0xff; /* RADCVOL */
+ break;
+
+ case WM8750_ALC1: /* ALC Control (1) */
+ s->alc = (value >> 7) & 3; /* ALCSEL */
+ break;
+
+ case WM8750_NGATE: /* Noise Gate Control */
+ case WM8750_3D: /* 3D enhance */
+ break;
+
+ case WM8750_LDAC: /* Left Channel Digital Volume */
+ s->outvol[0] = value & 0xff; /* LDACVOL */
+ break;
+
+ case WM8750_RDAC: /* Right Channel Digital Volume */
+ s->outvol[1] = value & 0xff; /* RDACVOL */
+ break;
+
+ case WM8750_BASS: /* Bass Control */
+ break;
+
+ case WM8750_LOUTM1: /* Left Mixer Control (1) */
+ s->path[0] = (value >> 8) & 1; /* LD2LO */
+ break;
+
+ case WM8750_LOUTM2: /* Left Mixer Control (2) */
+ s->path[1] = (value >> 8) & 1; /* RD2LO */
+ break;
+
+ case WM8750_ROUTM1: /* Right Mixer Control (1) */
+ s->path[2] = (value >> 8) & 1; /* LD2RO */
+ break;
+
+ case WM8750_ROUTM2: /* Right Mixer Control (2) */
+ s->path[3] = (value >> 8) & 1; /* RD2RO */
+ break;
+
+ case WM8750_MOUTM1: /* Mono Mixer Control (1) */
+ s->mpath[0] = (value >> 8) & 1; /* LD2MO */
+ break;
+
+ case WM8750_MOUTM2: /* Mono Mixer Control (2) */
+ s->mpath[1] = (value >> 8) & 1; /* RD2MO */
+ break;
+
+ case WM8750_LOUT1V: /* LOUT1 Volume */
+ s->outvol[2] = value & 0x7f; /* LOUT2VOL */
+ break;
+
+ case WM8750_LOUT2V: /* LOUT2 Volume */
+ s->outvol[4] = value & 0x7f; /* LOUT2VOL */
+ break;
+
+ case WM8750_ROUT1V: /* ROUT1 Volume */
+ s->outvol[3] = value & 0x7f; /* ROUT2VOL */
+ break;
+
+ case WM8750_ROUT2V: /* ROUT2 Volume */
+ s->outvol[5] = value & 0x7f; /* ROUT2VOL */
+ break;
+
+ case WM8750_MOUTV: /* MONOOUT Volume */
+ s->outvol[6] = value & 0x7f; /* MONOOUTVOL */
+ break;
+
+ case WM8750_ADCTL2: /* Additional Control (2) */
+ break;
+
+ case WM8750_PWR2: /* Power Management (2) */
+ s->power = value & 0x7e;
+ break;
+
+ case WM8750_IFACE: /* Digital Audio Interface Format */
+#ifdef VERBOSE
+ if (value & 0x40) /* MS */
+ printf("%s: attempt to enable Master Mode\n", __FUNCTION__);
+#endif
+ s->format = value;
+ wm8750_set_format(s);
+ break;
+
+ case WM8750_SRATE: /* Clocking and Sample Rate Control */
+ s->rate = &wm_rate_table[(value >> 1) & 0x1f];
+ wm8750_set_format(s);
+ break;
+
+ case WM8750_RESET: /* Reset */
+ wm8750_reset(&s->i2c);
+ break;
+
+#ifdef VERBOSE
+ default:
+ printf("%s: unknown register %02x\n", __FUNCTION__, cmd);
+#endif
+ }
+
+ return 0;
+}
+
+struct i2c_slave_s *wm8750_init(AudioState *audio)
+{
+ struct wm8750_s *s = qemu_mallocz(sizeof(struct wm8750_s));
+ s->i2c.opaque = s;
+ s->i2c.tx = wm8750_tx;
+ s->i2c.start = wm8750_start;
+
+ AUD_register_card(audio, CODEC, &s->card);
+ wm8750_reset(&s->i2c);
+ return &s->i2c;
+}
+
+void wm8750_fini(struct i2c_slave_s *i2c)
+{
+ struct wm8750_s *s = (struct wm8750_s *) i2c->opaque;
+ wm8750_reset(&s->i2c);
+ AUD_remove_card(&s->card);
+ qemu_free(s);
+}
+
+void wm8750_data_req_set(struct i2c_slave_s *i2c,
+ void (*data_req)(void *, int, int), void *opaque)
+{
+ struct wm8750_s *s = (struct wm8750_s *) i2c->opaque;
+ s->data_req = data_req;
+ s->opaque = opaque;
+}
+
+void wm8750_dac_dat(void *opaque, uint32_t sample)
+{
+ struct wm8750_s *s = (struct wm8750_s *) opaque;
+ uint32_t *data = (uint32_t *) &s->data_out[s->idx_out];
+ *data = sample & s->outmask;
+ s->req_out -= 4;
+ s->idx_out += 4;
+ if (s->idx_out >= sizeof(s->data_out) || s->req_out <= 0)
+ wm8750_out_flush(s);
+}
+
+uint32_t wm8750_adc_dat(void *opaque)
+{
+ struct wm8750_s *s = (struct wm8750_s *) opaque;
+ uint32_t *data;
+ if (s->idx_in >= sizeof(s->data_in))
+ wm8750_in_load(s);
+ data = (uint32_t *) &s->data_in[s->idx_in];
+ s->req_in -= 4;
+ s->idx_in += 4;
+ return *data & s->inmask;
+}
--
1.4.4.3
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