/*
* For Philips TEA5767 FM Chip used on some TV Cards like Prolink Pixelview
* I2C address is allways 0xC0.
*
* $Id: tea5767.c,v 1.11 2005/06/21 15:40:33 mchehab Exp $
*
* Copyright (c) 2005 Mauro Carvalho Chehab (mchehab@brturbo.com.br)
* This code is placed under the terms of the GNU General Public License
*
* tea5767 autodetection thanks to Torsten Seeboth and Atsushi Nakagawa
* from their contributions on DScaler.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/videodev.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <media/tuner.h>
/* Declared at tuner-core.c */
extern unsigned int tuner_debug;
#define PREFIX "TEA5767 "
/*****************************************************************************/
/******************************
* Write mode register values *
******************************/
/* First register */
#define TEA5767_MUTE 0x80 /* Mutes output */
#define TEA5767_SEARCH 0x40 /* Activates station search */
/* Bits 0-5 for divider MSB */
/* Second register */
/* Bits 0-7 for divider LSB */
/* Third register */
/* Station search from botton to up */
#define TEA5767_SEARCH_UP 0x80
/* Searches with ADC output = 10 */
#define TEA5767_SRCH_HIGH_LVL 0x60
/* Searches with ADC output = 10 */
#define TEA5767_SRCH_MID_LVL 0x40
/* Searches with ADC output = 5 */
#define TEA5767_SRCH_LOW_LVL 0x20
/* if on, div=4*(Frf+Fif)/Fref otherwise, div=4*(Frf-Fif)/Freq) */
#define TEA5767_HIGH_LO_INJECT 0x10
/* Disable stereo */
#define TEA5767_MONO 0x08
/* Disable right channel and turns to mono */
#define TEA5767_MUTE_RIGHT 0x04
/* Disable left channel and turns to mono */
#define TEA5767_MUTE_LEFT 0x02
#define TEA5767_PORT1_HIGH 0x01
/* Forth register */
#define TEA5767_PORT2_HIGH 0x80
/* Chips stops working. Only I2C bus remains on */
#define TEA5767_STDBY 0x40
/* Japan freq (76-108 MHz. If disabled, 87.5-108 MHz */
#define TEA5767_JAPAN_BAND 0x20
/* Unselected means 32.768 KHz freq as reference. Otherwise Xtal at 13 MHz */
#define TEA5767_XTAL_32768 0x10
/* Cuts weak signals */
#define TEA5767_SOFT_MUTE 0x08
/* Activates high cut control */
#define TEA5767_HIGH_CUT_CTRL 0x04
/* Activates stereo noise control */
#define TEA5767_ST_NOISE_CTL 0x02
/* If activate PORT 1 indicates SEARCH or else it is used as PORT1 */
#define TEA5767_SRCH_IND 0x01
/* Fiveth register */
/* By activating, it will use Xtal at 13 MHz as reference for divider */
#define TEA5767_PLLREF_ENABLE 0x80
/* By activating, deemphasis=50, or else, deemphasis of 50us */
#define TEA5767_DEEMPH_75 0X40
/*****************************
* Read mode register values *
*****************************/
/* First register */
#define TEA5767_READY_FLAG_MASK 0x80
#define TEA5767_BAND_LIMIT_MASK 0X40
/* Bits 0-5 for divider MSB after search or preset */
/* Second register */
/* Bits 0-7 for divider LSB after search or preset */
/* Third register */
#define TEA5767_STEREO_MASK 0x80
#define TEA5767_IF_CNTR_MASK 0x7f
/* Four register */
#define TEA5767_ADC_LEVEL_MASK 0xf0
/* should be 0 */
#define TEA5767_CHIP_ID_MASK 0x0f
/* Fiveth register */
/* Reserved for future extensions */
#define TEA5767_RESERVED_MASK 0xff
/*****************************************************************************/
static void set_tv_freq(struct i2c_client *c, unsigned int freq)
{
struct tuner *t = i2c_get_clientdata(c);
tuner_warn("This tuner doesn't support TV freq.\n");
}
static void tea5767_status_dump(unsigned char *buffer)
{
unsigned int div, frq;
if (TEA5767_READY_FLAG_MASK & buffer[0])
printk(PREFIX "Ready Flag ON\n");
else
printk(PREFIX "Ready Flag OFF\n");
if (TEA5767_BAND_LIMIT_MASK & buffer[0])
printk(PREFIX "Tuner at band limit\n");
else
printk(PREFIX "Tuner not at band limit\n");
div=((buffer[0]&0x3f)<<8) | buffer[1];
switch (TEA5767_HIGH_LO_32768) {
case TEA5767_HIGH_LO_13MHz:
frq = 1000*(div*50-700-225)/4; /* Freq in KHz */
break;
case TEA5767_LOW_LO_13MHz:
frq = 1000*(div*50+700+225)/4; /* Freq in KHz */
break;
case TEA5767_LOW_LO_32768:
frq = 1000*(div*32768/1000+700+225)/4; /* Freq in KHz */
break;
case TEA5767_HIGH_LO_32768:
default:
frq = 1000*(div*32768/1000-700-225)/4; /* Freq in KHz */
break;
}
buffer[0] = (div>>8) & 0x3f;
buffer[1] = div & 0xff;
printk(PREFIX "Frequency %d.%03d KHz (divider = 0x%04x)\n",
frq/1000,frq%1000,div);
if (TEA5767_STEREO_MASK & buffer[2])
printk(PREFIX "Stereo\n");
else
printk(PREFIX "Mono\n");
printk(PREFIX "IF Counter = %d\n",buffer[2] & TEA5767_IF_CNTR_MASK);
printk(PREFIX "ADC Level = %d\n",(buffer[3] & TEA5767_ADC_LEVEL_MASK)>>4);
printk(PREFIX "Chip ID = %d\n",(buffer[3] & TEA5767_CHIP_ID_MASK));
printk(PREFIX "Reserved = 0x%02x\n",(buffer[4] & TEA5767_RESERVED_MASK));
}
/* Freq should be specifyed at 62.5 Hz */
static void set_radio_freq(struct i2c_client *c, unsigned int frq)
{
struct tuner *t = i2c_get_clientdata(c);
unsigned char buffer[5];
unsigned div;
int rc;
if ( tuner_debug )
printk(PREFIX "radio freq counter %d\n",frq);
/* Rounds freq to next decimal value - for 62.5 KHz step */
/* frq = 20*(frq/16)+radio_frq[frq%16]; */
buffer[2] = TEA5767_PORT1_HIGH;
buffer[3] = TEA5767_PORT2_HIGH | TEA5767_HIGH_CUT_CTRL | TEA5767_ST_NOISE_CTL | TEA5767_JAPAN_BAND;
buffer[4]=0;
if (t->audmode == V4L2_TUNER_MODE_MONO) {
tuner_dbg("TEA5767 set to mono\n");
buffer[2] |= TEA5767_MONO;
} else
tuner_dbg("TEA5767 set to stereo\n");
switch (t->type) {
case TEA5767_HIGH_LO_13MHz:
tuner_dbg("TEA5767 radio HIGH LO inject xtal @ 13 MHz\n");
buffer[2] |= TEA5767_HIGH_LO_INJECT;
buffer[4] |= TEA5767_PLLREF_ENABLE;
div = (frq*4/16+700+225+25)/50;
break;
case TEA5767_LOW_LO_13MHz:
tuner_dbg("TEA5767 radio LOW LO inject xtal @ 13 MHz\n");
buffer[4] |= TEA5767_PLLREF_ENABLE;
div = (frq*4/16-700-225+25)/50;
break;
case TEA5767_LOW_LO_32768:
tuner_dbg("TEA5767 radio LOW LO inject xtal @ 32,768 MHz\n");
buffer[3] |= TEA5767_XTAL_32768;
/* const 700=4000*175 Khz - to adjust freq to right value */
div = (1000*(frq*4/16-700-225)+16384)>>15;
break;
case TEA5767_HIGH_LO_32768:
default:
tuner_dbg("TEA5767 radio HIGH LO inject xtal @ 32,768 MHz\n");
buffer[2] |= TEA5767_HIGH_LO_INJECT;
buffer[3] |= TEA5767_XTAL_32768;
div = (1000*(frq*4/16+700+225)+16384)>>15;
break;
}
buffer[0] = (div>>8) & 0x3f;
buffer[1] = div & 0xff;
if ( tuner_debug )
tea5767_status_dump(buffer);
if (5 != (rc = i2c_master_send(c,buffer,5)))
tuner_warn("i2c i/o error: rc == %d (should be 5)\n",rc);
}
static int tea5767_signal(struct i2c_client *c)
{
unsigned char buffer[5];
int rc;
struct tuner *t = i2c_get_clientdata(c);
memset(buffer,0,sizeof(buffer));
if (5 != (rc = i2c_master_recv(c,buffer,5)))
tuner_warn ( "i2c i/o error: rc == %d (should be 5)\n",rc);
return ((buffer[3] & TEA5767_ADC_LEVEL_MASK) <<(13-4));
}
static int tea5767_stereo(struct i2c_client *c)
{
unsigned char buffer[5];
int rc;
struct tuner *t = i2c_get_clientdata(c);
memset(buffer,0,sizeof(buffer));
if (5 != (rc = i2c_master_recv(c,buffer,5)))
tuner_warn ( "i2c i/o error: rc == %d (should be 5)\n",rc);
rc = buffer[2] & TEA5767_STEREO_MASK;
if ( tuner_debug )
tuner_dbg("TEA5767 radio ST GET = %02x\n", rc);
return ( (buffer[2] & TEA5767_STEREO_MASK) ? V4L2_TUNER_SUB_STEREO: 0);
}
int tea_detection(struct i2c_client *c)
{
unsigned char buffer[5]= { 0xff, 0xff, 0xff, 0xff, 0xff };
int rc;
struct tuner *t = i2c_get_clientdata(c);
if (5 != (rc = i2c_master_recv(c,buffer,5))) {
tuner_warn ( "it is not a TEA5767. Received %i chars.\n",rc );
return EINVAL;
}
/* If all bytes are the same then it's a TV tuner and not a tea5767 chip. */
if (buffer[0] == buffer[1] && buffer[0] == buffer[2] &&
buffer[0] == buffer[3] && buffer[0] == buffer[4]) {
tuner_warn ( "All bytes are equal. It is not a TEA5767\n" );
return EINVAL;
}
/* Status bytes:
* Byte 4: bit 3:1 : CI (Chip Identification) == 0
* bit 0 : internally set to 0
* Byte 5: bit 7:0 : == 0
*/
if (!((buffer[3] & 0x0f) == 0x00) && (buffer[4] == 0x00)) {
tuner_warn ( "Chip ID is not zero. It is not a TEA5767\n" );
return EINVAL;
}
tuner_warn ( "TEA5767 detected.\n" );
return 0;
}
int tea5767_tuner_init(struct i2c_client *c)
{
struct tuner *t = i2c_get_clientdata(c);
if (tea_detection(c)==EINVAL) return EINVAL;
tuner_info("type set to %d (%s)\n",
t->type, TEA5767_TUNER_NAME);
strlcpy(c->name, TEA5767_TUNER_NAME, sizeof(c->name));
t->tv_freq = set_tv_freq;
t->radio_freq = set_radio_freq;
t->has_signal = tea5767_signal;
t->is_stereo = tea5767_stereo;
return (0);
}
