/*
* Routines for control of the CS8427 via i2c bus
* IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic
* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
*
*
* 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
*
*/
#include <sound/driver.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.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(snd_i2c_device_t *cs8427);
MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
MODULE_LICENSE("GPL");
#define CS8427_ADDR (0x20>>1) /* fixed address */
typedef struct {
snd_pcm_substream_t *substream;
char hw_status[24]; /* hardware status */
char def_status[24]; /* default status */
char pcm_status[24]; /* PCM private status */
char hw_udata[32];
snd_kcontrol_t *pcm_ctl;
} cs8427_stream_t;
typedef struct {
unsigned char regmap[0x14]; /* map of first 1 + 13 registers */
unsigned int rate;
unsigned int reset_timeout;
cs8427_stream_t playback;
cs8427_stream_t capture;
} cs8427_t;
static unsigned char swapbits(unsigned char val)
{
int bit;
unsigned char res = 0;
for (bit = 0; bit < 8; bit++) {
res <<= 1;
res |= val & 1;
val >>= 1;
}
return res;
}
int snd_cs8427_reg_write(snd_i2c_device_t *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("unable to send bytes 0x%02x:0x%02x to CS8427 (%i)\n", buf[0], buf[1], err);
return err < 0 ? err : -EIO;
}
return 0;
}
static int snd_cs8427_reg_read(snd_i2c_device_t *device, unsigned char reg)
{
int err;
unsigned char buf;
if ((err = snd_i2c_sendbytes(device, ®, 1)) != 1) {
snd_printk("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("unable to read register 0x%x byte from CS8427\n", reg);
return err < 0 ? err : -EIO;
}
return buf;
}
static int snd_cs8427_select_corudata(snd_i2c_device_t *device, int udata)
{
cs8427_t *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(snd_i2c_device_t *device,
int udata,
unsigned char *ndata,
int count)
{
cs8427_t *chip = device->private_data;
char *hw_data = udata ? chip->playback.hw_udata : chip->playback.hw_status;
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;
if ((err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF, chip->regmap[CS8427_REG_UDATABUF])) < 0)
return err;
return 0;
}
}
data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
for (idx = 0; idx < count; idx++)
data[idx + 1] = swapbits(ndata[idx]);
if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
return -EIO;
return 1;
}
static void snd_cs8427_free(snd_i2c_device_t *device)
{
kfree(device->private_data);
}
int snd_cs8427_create(snd_i2c_bus_t *bus,
unsigned char addr,
unsigned int reset_timeout,
snd_i2c_device_t **r_cs8427)
{
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,
};
int err;
cs8427_t *chip;
snd_i2c_device_t *device;
unsigned char buf[24];
if ((err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7), &device)) < 0)
return err;
chip = device->private_data = kcalloc(1, sizeof(*chip), GFP_KERNEL);
if (chip == NULL) {
snd_i2c_device_free(device);
return -ENOMEM;
}
device->private_free = snd_cs8427_free;
snd_i2c_lock(bus);
if ((err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER)) != CS8427_VER8427A) {
snd_i2c_unlock(bus);
snd_printk("unable to find CS8427 signature (expected 0x%x, read 0x%x), initialization is not completed\n", CS8427_VER8427A, err);
return -EFAULT;
}
/* turn off run bit while making changes to configuration */
if ((err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00)) < 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 */
buf[0] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 0));
buf[1] = ((unsigned cha
