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linux-brain/sound/i2c/cs8427.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

609 lines
17 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Routines for control of the CS8427 via i2c bus
* IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*/
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/bitrev.h>
#include <linux/module.h>
#include <asm/unaligned.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/cs8427.h>
#include <sound/asoundef.h>
static void snd_cs8427_reset(struct snd_i2c_device *cs8427);
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
MODULE_LICENSE("GPL");
#define CS8427_ADDR (0x20>>1) /* fixed address */
struct cs8427_stream {
struct snd_pcm_substream *substream;
char hw_status[24]; /* hardware status */
char def_status[24]; /* default status */
char pcm_status[24]; /* PCM private status */
char hw_udata[32];
struct snd_kcontrol *pcm_ctl;
};
struct cs8427 {
unsigned char regmap[0x14]; /* map of first 1 + 13 registers */
unsigned int rate;
unsigned int reset_timeout;
struct cs8427_stream playback;
struct cs8427_stream capture;
};
int snd_cs8427_reg_write(struct snd_i2c_device *device, unsigned char reg,
unsigned char val)
{
int err;
unsigned char buf[2];
buf[0] = reg & 0x7f;
buf[1] = val;
if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {
snd_printk(KERN_ERR "unable to send bytes 0x%02x:0x%02x "
"to CS8427 (%i)\n", buf[0], buf[1], err);
return err < 0 ? err : -EIO;
}
return 0;
}
EXPORT_SYMBOL(snd_cs8427_reg_write);
static int snd_cs8427_reg_read(struct snd_i2c_device *device, unsigned char reg)
{
int err;
unsigned char buf;
if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
snd_printk(KERN_ERR "unable to send register 0x%x byte "
"to CS8427\n", reg);
return err < 0 ? err : -EIO;
}
if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {
snd_printk(KERN_ERR "unable to read register 0x%x byte "
"from CS8427\n", reg);
return err < 0 ? err : -EIO;
}
return buf;
}
static int snd_cs8427_select_corudata(struct snd_i2c_device *device, int udata)
{
struct cs8427 *chip = device->private_data;
int err;
udata = udata ? CS8427_BSEL : 0;
if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
chip->regmap[CS8427_REG_CSDATABUF] |= udata;
err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF,
chip->regmap[CS8427_REG_CSDATABUF]);
if (err < 0)
return err;
}
return 0;
}
static int snd_cs8427_send_corudata(struct snd_i2c_device *device,
int udata,
unsigned char *ndata,
int count)
{
struct cs8427 *chip = device->private_data;
char *hw_data = udata ?
chip->playback.hw_udata : chip->playback.hw_status;
unsigned char data[32];
int err, idx;
if (!memcmp(hw_data, ndata, count))
return 0;
if ((err = snd_cs8427_select_corudata(device, udata)) < 0)
return err;
memcpy(hw_data, ndata, count);
if (udata) {
memset(data, 0, sizeof(data));
if (memcmp(hw_data, data, count) == 0) {
chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS |
CS8427_EFTUI;
err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF,
chip->regmap[CS8427_REG_UDATABUF]);
return err < 0 ? err : 0;
}
}
data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
for (idx = 0; idx < count; idx++)
data[idx + 1] = bitrev8(ndata[idx]);
if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
return -EIO;
return 1;
}
static void snd_cs8427_free(struct snd_i2c_device *device)
{
kfree(device->private_data);
}
int snd_cs8427_init(struct snd_i2c_bus *bus,
struct snd_i2c_device *device)
{
static unsigned char initvals1[] = {
CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
/* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes,
TCBL=output */
CS8427_SWCLK | CS8427_TCBLDIR,
/* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs,
normal stereo operation */
0x00,
/* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial,
Rx=>serial */
CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
/* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs,
output time base = OMCK, input time base = recovered input clock,
recovered input clock source is ILRCK changed to AES3INPUT
(workaround, see snd_cs8427_reset) */
CS8427_RXDILRCK,
/* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S,
24-bit, 64*Fsi */
CS8427_SIDEL | CS8427_SILRPOL,
/* CS8427_REG_SERIALOUTPUT: Serial audio output port data format
= I2S, 24-bit, 64*Fsi */
CS8427_SODEL | CS8427_SOLRPOL,
};
static unsigned char initvals2[] = {
CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
/* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence,
biphase, parity status bits */
/* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR,*/
0xff, /* set everything */
/* CS8427_REG_CSDATABUF:
Registers 32-55 window to CS buffer
Inhibit D->E transfers from overwriting first 5 bytes of CS data.
Inhibit D->E transfers (all) of CS data.
Allow E->F transfer of CS data.
One byte mode; both A/B channels get same written CB data.
A channel info is output to chip's EMPH* pin. */
CS8427_CBMR | CS8427_DETCI,
/* CS8427_REG_UDATABUF:
Use internal buffer to transmit User (U) data.
Chip's U pin is an output.
Transmit all O's for user data.
Inhibit D->E transfers.
Inhibit E->F transfers. */
CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
};
struct cs8427 *chip = device->private_data;
int err;
unsigned char buf[24];
snd_i2c_lock(bus);
err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
if (err != CS8427_VER8427A) {
/* give second chance */
snd_printk(KERN_WARNING "invalid CS8427 signature 0x%x: "
"let me try again...\n", err);
err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
}
if (err != CS8427_VER8427A) {
snd_i2c_unlock(bus);
snd_printk(KERN_ERR "unable to find CS8427 signature "
"(expected 0x%x, read 0x%x),\n",
CS8427_VER8427A, err);
snd_printk(KERN_ERR " initialization is not completed\n");
return -EFAULT;
}
/* turn off run bit while making changes to configuration */
err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00);
if (err < 0)
goto __fail;
/* send initial values */
memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
err = err < 0 ? err : -EIO;
goto __fail;
}
/* Turn off CS8427 interrupt stuff that is not used in hardware */
memset(buf, 0, 7);
/* from address 9 to 15 */
buf[0] = 9; /* register */
if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
goto __fail;
/* send transfer initialization sequence */
memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
err = err < 0 ? err : -EIO;
goto __fail;
}
/* write default channel status bytes */
put_unaligned_le32(SNDRV_PCM_DEFAULT_CON_SPDIF, buf);
memset(buf + 4, 0, 24 - 4);
if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
goto __fail;
memcpy(chip->playback.def_status, buf, 24);
memcpy(chip->playback.pcm_status, buf, 24);
snd_i2c_unlock(bus);
/* turn on run bit and rock'n'roll */
snd_cs8427_reset(device);
return 0;
__fail:
snd_i2c_unlock(bus);
return err;
}
EXPORT_SYMBOL(snd_cs8427_init);
int snd_cs8427_create(struct snd_i2c_bus *bus,
unsigned char addr,
unsigned int reset_timeout,
struct snd_i2c_device **r_cs8427)
{
int err;
struct cs8427 *chip;
struct snd_i2c_device *device;
err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7),
&device);
if (err < 0)
return err;
chip = device->private_data = kzalloc(sizeof(*chip), GFP_KERNEL);
if (chip == NULL) {
snd_i2c_device_free(device);
return -ENOMEM;
}
device->private_free = snd_cs8427_free;
if (reset_timeout < 1)
reset_timeout = 1;
chip->reset_timeout = reset_timeout;
err = snd_cs8427_init(bus, device);
if (err)
goto __fail;
#if 0 // it's nice for read tests
{
char buf[128];
int xx;
buf[0] = 0x81;
snd_i2c_sendbytes(device, buf, 1);
snd_i2c_readbytes(device, buf, 127);
for (xx = 0; xx < 127; xx++)
printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
}
#endif
if (r_cs8427)
*r_cs8427 = device;
return 0;
__fail:
snd_i2c_device_free(device);
return err < 0 ? err : -EIO;
}
EXPORT_SYMBOL(snd_cs8427_create);
/*
* Reset the chip using run bit, also lock PLL using ILRCK and
* put back AES3INPUT. This workaround is described in latest
* CS8427 datasheet, otherwise TXDSERIAL will not work.
*/
static void snd_cs8427_reset(struct snd_i2c_device *cs8427)
{
struct cs8427 *chip;
unsigned long end_time;
int data, aes3input = 0;
if (snd_BUG_ON(!cs8427))
return;
chip = cs8427->private_data;
snd_i2c_lock(cs8427->bus);
if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) ==
CS8427_RXDAES3INPUT) /* AES3 bit is set */
aes3input = 1;
chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
chip->regmap[CS8427_REG_CLOCKSOURCE]);
udelay(200);
chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
chip->regmap[CS8427_REG_CLOCKSOURCE]);
udelay(200);
snd_i2c_unlock(cs8427->bus);
end_time = jiffies + chip->reset_timeout;
while (time_after_eq(end_time, jiffies)) {
snd_i2c_lock(cs8427->bus);
data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
snd_i2c_unlock(cs8427->bus);
if (!(data & CS8427_UNLOCK))
break;
schedule_timeout_uninterruptible(1);
}
snd_i2c_lock(cs8427->bus);
chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
if (aes3input)
chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
chip->regmap[CS8427_REG_CLOCKSOURCE]);
snd_i2c_unlock(cs8427->bus);
}
static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 1;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = 255;
return 0;
}
static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
int data;
snd_i2c_lock(device->bus);
data = snd_cs8427_reg_read(device, kcontrol->private_value);
snd_i2c_unlock(device->bus);
if (data < 0)
return data;
ucontrol->value.integer.value[0] = data;
return 0;
}
static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
uinfo->count = 10;
return 0;
}
static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
unsigned char reg = CS8427_REG_QSUBCODE;
int err;
snd_i2c_lock(device->bus);
if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
snd_printk(KERN_ERR "unable to send register 0x%x byte "
"to CS8427\n", reg);
snd_i2c_unlock(device->bus);
return err < 0 ? err : -EIO;
}
err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10);
if (err != 10) {
snd_printk(KERN_ERR "unable to read Q-subcode bytes "
"from CS8427\n");
snd_i2c_unlock(device->bus);
return err < 0 ? err : -EIO;
}
snd_i2c_unlock(device->bus);
return 0;
}
static int snd_cs8427_spdif_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
uinfo->count = 1;
return 0;
}
static int snd_cs8427_spdif_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
struct cs8427 *chip = device->private_data;
snd_i2c_lock(device->bus);
memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
snd_i2c_unlock(device->bus);
return 0;
}
static int snd_cs8427_spdif_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
struct cs8427 *chip = device->private_data;
unsigned char *status = kcontrol->private_value ?
chip->playback.pcm_status : chip->playback.def_status;
struct snd_pcm_runtime *runtime = chip->playback.substream ?
chip->playback.substream->runtime : NULL;
int err, change;
snd_i2c_lock(device->bus);
change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
memcpy(status, ucontrol->value.iec958.status, 24);
if (change && (kcontrol->private_value ?
runtime != NULL : runtime == NULL)) {
err = snd_cs8427_send_corudata(device, 0, status, 24);
if (err < 0)
change = err;
}
snd_i2c_unlock(device->bus);
return change;
}
static int snd_cs8427_spdif_mask_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
uinfo->count = 1;
return 0;
}
static int snd_cs8427_spdif_mask_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
memset(ucontrol->value.iec958.status, 0xff, 24);
return 0;
}
static struct snd_kcontrol_new snd_cs8427_iec958_controls[] = {
{
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.info = snd_cs8427_in_status_info,
.name = "IEC958 CS8427 Input Status",
.access = (SNDRV_CTL_ELEM_ACCESS_READ |
SNDRV_CTL_ELEM_ACCESS_VOLATILE),
.get = snd_cs8427_in_status_get,
.private_value = 15,
},
{
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.info = snd_cs8427_in_status_info,
.name = "IEC958 CS8427 Error Status",
.access = (SNDRV_CTL_ELEM_ACCESS_READ |
SNDRV_CTL_ELEM_ACCESS_VOLATILE),
.get = snd_cs8427_in_status_get,
.private_value = 16,
},
{
.access = SNDRV_CTL_ELEM_ACCESS_READ,
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.name = SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
.info = snd_cs8427_spdif_mask_info,
.get = snd_cs8427_spdif_mask_get,
},
{
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.name = SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
.info = snd_cs8427_spdif_info,
.get = snd_cs8427_spdif_get,
.put = snd_cs8427_spdif_put,
.private_value = 0
},
{
.access = (SNDRV_CTL_ELEM_ACCESS_READWRITE |
SNDRV_CTL_ELEM_ACCESS_INACTIVE),
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.name = SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
.info = snd_cs8427_spdif_info,
.get = snd_cs8427_spdif_get,
.put = snd_cs8427_spdif_put,
.private_value = 1
},
{
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.info = snd_cs8427_qsubcode_info,
.name = "IEC958 Q-subcode Capture Default",
.access = (SNDRV_CTL_ELEM_ACCESS_READ |
SNDRV_CTL_ELEM_ACCESS_VOLATILE),
.get = snd_cs8427_qsubcode_get
}};
int snd_cs8427_iec958_build(struct snd_i2c_device *cs8427,
struct snd_pcm_substream *play_substream,
struct snd_pcm_substream *cap_substream)
{
struct cs8427 *chip = cs8427->private_data;
struct snd_kcontrol *kctl;
unsigned int idx;
int err;
if (snd_BUG_ON(!play_substream || !cap_substream))
return -EINVAL;
for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
if (kctl == NULL)
return -ENOMEM;
kctl->id.device = play_substream->pcm->device;
kctl->id.subdevice = play_substream->number;
err = snd_ctl_add(cs8427->bus->card, kctl);
if (err < 0)
return err;
if (! strcmp(kctl->id.name,
SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
chip->playback.pcm_ctl = kctl;
}
chip->playback.substream = play_substream;
chip->capture.substream = cap_substream;
if (snd_BUG_ON(!chip->playback.pcm_ctl))
return -EIO;
return 0;
}
EXPORT_SYMBOL(snd_cs8427_iec958_build);
int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active)
{
struct cs8427 *chip;
if (snd_BUG_ON(!cs8427))
return -ENXIO;
chip = cs8427->private_data;
if (active)
memcpy(chip->playback.pcm_status,
chip->playback.def_status, 24);
chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
snd_ctl_notify(cs8427->bus->card,
SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
&chip->playback.pcm_ctl->id);
return 0;
}
EXPORT_SYMBOL(snd_cs8427_iec958_active);
int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate)
{
struct cs8427 *chip;
char *status;
int err, reset;
if (snd_BUG_ON(!cs8427))
return -ENXIO;
chip = cs8427->private_data;
status = chip->playback.pcm_status;
snd_i2c_lock(cs8427->bus);
if (status[0] & IEC958_AES0_PROFESSIONAL) {
status[0] &= ~IEC958_AES0_PRO_FS;
switch (rate) {
case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
}
} else {
status[3] &= ~IEC958_AES3_CON_FS;
switch (rate) {
case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
}
}
err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
if (err > 0)
snd_ctl_notify(cs8427->bus->card,
SNDRV_CTL_EVENT_MASK_VALUE,
&chip->playback.pcm_ctl->id);
reset = chip->rate != rate;
chip->rate = rate;
snd_i2c_unlock(cs8427->bus);
if (reset)
snd_cs8427_reset(cs8427);
return err < 0 ? err : 0;
}
EXPORT_SYMBOL(snd_cs8427_iec958_pcm);
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