462 строки
11 KiB
C
462 строки
11 KiB
C
/*
|
|
*
|
|
* device driver for philips saa7134 based TV cards
|
|
* i2c interface support
|
|
*
|
|
* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include "saa7134.h"
|
|
#include "saa7134-reg.h"
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <media/v4l2-common.h>
|
|
|
|
/* ----------------------------------------------------------- */
|
|
|
|
static unsigned int i2c_debug;
|
|
module_param(i2c_debug, int, 0644);
|
|
MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
|
|
|
|
static unsigned int i2c_scan;
|
|
module_param(i2c_scan, int, 0444);
|
|
MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
|
|
|
|
#define i2c_dbg(level, fmt, arg...) do { \
|
|
if (i2c_debug == level) \
|
|
printk(KERN_DEBUG pr_fmt("i2c: " fmt), ## arg); \
|
|
} while (0)
|
|
|
|
#define i2c_cont(level, fmt, arg...) do { \
|
|
if (i2c_debug == level) \
|
|
pr_cont(fmt, ## arg); \
|
|
} while (0)
|
|
|
|
#define I2C_WAIT_DELAY 32
|
|
#define I2C_WAIT_RETRY 16
|
|
|
|
/* ----------------------------------------------------------- */
|
|
|
|
static char *str_i2c_status[] = {
|
|
"IDLE", "DONE_STOP", "BUSY", "TO_SCL", "TO_ARB", "DONE_WRITE",
|
|
"DONE_READ", "DONE_WRITE_TO", "DONE_READ_TO", "NO_DEVICE",
|
|
"NO_ACKN", "BUS_ERR", "ARB_LOST", "SEQ_ERR", "ST_ERR", "SW_ERR"
|
|
};
|
|
|
|
enum i2c_status {
|
|
IDLE = 0, // no I2C command pending
|
|
DONE_STOP = 1, // I2C command done and STOP executed
|
|
BUSY = 2, // executing I2C command
|
|
TO_SCL = 3, // executing I2C command, time out on clock stretching
|
|
TO_ARB = 4, // time out on arbitration trial, still trying
|
|
DONE_WRITE = 5, // I2C command done and awaiting next write command
|
|
DONE_READ = 6, // I2C command done and awaiting next read command
|
|
DONE_WRITE_TO = 7, // see 5, and time out on status echo
|
|
DONE_READ_TO = 8, // see 6, and time out on status echo
|
|
NO_DEVICE = 9, // no acknowledge on device slave address
|
|
NO_ACKN = 10, // no acknowledge after data byte transfer
|
|
BUS_ERR = 11, // bus error
|
|
ARB_LOST = 12, // arbitration lost during transfer
|
|
SEQ_ERR = 13, // erroneous programming sequence
|
|
ST_ERR = 14, // wrong status echoing
|
|
SW_ERR = 15 // software error
|
|
};
|
|
|
|
static char *str_i2c_attr[] = {
|
|
"NOP", "STOP", "CONTINUE", "START"
|
|
};
|
|
|
|
enum i2c_attr {
|
|
NOP = 0, // no operation on I2C bus
|
|
STOP = 1, // stop condition, no associated byte transfer
|
|
CONTINUE = 2, // continue with byte transfer
|
|
START = 3 // start condition with byte transfer
|
|
};
|
|
|
|
static inline enum i2c_status i2c_get_status(struct saa7134_dev *dev)
|
|
{
|
|
enum i2c_status status;
|
|
|
|
status = saa_readb(SAA7134_I2C_ATTR_STATUS) & 0x0f;
|
|
i2c_dbg(2, "i2c stat <= %s\n", str_i2c_status[status]);
|
|
return status;
|
|
}
|
|
|
|
static inline void i2c_set_status(struct saa7134_dev *dev,
|
|
enum i2c_status status)
|
|
{
|
|
i2c_dbg(2, "i2c stat => %s\n", str_i2c_status[status]);
|
|
saa_andorb(SAA7134_I2C_ATTR_STATUS,0x0f,status);
|
|
}
|
|
|
|
static inline void i2c_set_attr(struct saa7134_dev *dev, enum i2c_attr attr)
|
|
{
|
|
i2c_dbg(2, "i2c attr => %s\n", str_i2c_attr[attr]);
|
|
saa_andorb(SAA7134_I2C_ATTR_STATUS,0xc0,attr << 6);
|
|
}
|
|
|
|
static inline int i2c_is_error(enum i2c_status status)
|
|
{
|
|
switch (status) {
|
|
case NO_DEVICE:
|
|
case NO_ACKN:
|
|
case BUS_ERR:
|
|
case ARB_LOST:
|
|
case SEQ_ERR:
|
|
case ST_ERR:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static inline int i2c_is_idle(enum i2c_status status)
|
|
{
|
|
switch (status) {
|
|
case IDLE:
|
|
case DONE_STOP:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static inline int i2c_is_busy(enum i2c_status status)
|
|
{
|
|
switch (status) {
|
|
case BUSY:
|
|
case TO_SCL:
|
|
case TO_ARB:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static int i2c_is_busy_wait(struct saa7134_dev *dev)
|
|
{
|
|
enum i2c_status status;
|
|
int count;
|
|
|
|
for (count = 0; count < I2C_WAIT_RETRY; count++) {
|
|
status = i2c_get_status(dev);
|
|
if (!i2c_is_busy(status))
|
|
break;
|
|
saa_wait(I2C_WAIT_DELAY);
|
|
}
|
|
if (I2C_WAIT_RETRY == count)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static int i2c_reset(struct saa7134_dev *dev)
|
|
{
|
|
enum i2c_status status;
|
|
int count;
|
|
|
|
i2c_dbg(2, "i2c reset\n");
|
|
status = i2c_get_status(dev);
|
|
if (!i2c_is_error(status))
|
|
return true;
|
|
i2c_set_status(dev,status);
|
|
|
|
for (count = 0; count < I2C_WAIT_RETRY; count++) {
|
|
status = i2c_get_status(dev);
|
|
if (!i2c_is_error(status))
|
|
break;
|
|
udelay(I2C_WAIT_DELAY);
|
|
}
|
|
if (I2C_WAIT_RETRY == count)
|
|
return false;
|
|
|
|
if (!i2c_is_idle(status))
|
|
return false;
|
|
|
|
i2c_set_attr(dev,NOP);
|
|
return true;
|
|
}
|
|
|
|
static inline int i2c_send_byte(struct saa7134_dev *dev,
|
|
enum i2c_attr attr,
|
|
unsigned char data)
|
|
{
|
|
enum i2c_status status;
|
|
__u32 dword;
|
|
|
|
/* have to write both attr + data in one 32bit word */
|
|
dword = saa_readl(SAA7134_I2C_ATTR_STATUS >> 2);
|
|
dword &= 0x0f;
|
|
dword |= (attr << 6);
|
|
dword |= ((__u32)data << 8);
|
|
dword |= 0x00 << 16; /* 100 kHz */
|
|
// dword |= 0x40 << 16; /* 400 kHz */
|
|
dword |= 0xf0 << 24;
|
|
saa_writel(SAA7134_I2C_ATTR_STATUS >> 2, dword);
|
|
i2c_dbg(2, "i2c data => 0x%x\n", data);
|
|
|
|
if (!i2c_is_busy_wait(dev))
|
|
return -EIO;
|
|
status = i2c_get_status(dev);
|
|
if (i2c_is_error(status))
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
static inline int i2c_recv_byte(struct saa7134_dev *dev)
|
|
{
|
|
enum i2c_status status;
|
|
unsigned char data;
|
|
|
|
i2c_set_attr(dev,CONTINUE);
|
|
if (!i2c_is_busy_wait(dev))
|
|
return -EIO;
|
|
status = i2c_get_status(dev);
|
|
if (i2c_is_error(status))
|
|
return -EIO;
|
|
data = saa_readb(SAA7134_I2C_DATA);
|
|
i2c_dbg(2, "i2c data <= 0x%x\n", data);
|
|
return data;
|
|
}
|
|
|
|
static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap,
|
|
struct i2c_msg *msgs, int num)
|
|
{
|
|
struct saa7134_dev *dev = i2c_adap->algo_data;
|
|
enum i2c_status status;
|
|
unsigned char data;
|
|
int addr,rc,i,byte;
|
|
|
|
status = i2c_get_status(dev);
|
|
if (!i2c_is_idle(status))
|
|
if (!i2c_reset(dev))
|
|
return -EIO;
|
|
|
|
i2c_dbg(2, "start xfer\n");
|
|
i2c_dbg(1, "i2c xfer:");
|
|
for (i = 0; i < num; i++) {
|
|
if (!(msgs[i].flags & I2C_M_NOSTART) || 0 == i) {
|
|
/* send address */
|
|
i2c_dbg(2, "send address\n");
|
|
addr = msgs[i].addr << 1;
|
|
if (msgs[i].flags & I2C_M_RD)
|
|
addr |= 1;
|
|
if (i > 0 && msgs[i].flags &
|
|
I2C_M_RD && msgs[i].addr != 0x40 &&
|
|
msgs[i].addr != 0x41 &&
|
|
msgs[i].addr != 0x19) {
|
|
/* workaround for a saa7134 i2c bug
|
|
* needed to talk to the mt352 demux
|
|
* thanks to pinnacle for the hint */
|
|
int quirk = 0xfe;
|
|
i2c_cont(1, " [%02x quirk]", quirk);
|
|
i2c_send_byte(dev,START,quirk);
|
|
i2c_recv_byte(dev);
|
|
}
|
|
i2c_cont(1, " < %02x", addr);
|
|
rc = i2c_send_byte(dev,START,addr);
|
|
if (rc < 0)
|
|
goto err;
|
|
}
|
|
if (msgs[i].flags & I2C_M_RD) {
|
|
/* read bytes */
|
|
i2c_dbg(2, "read bytes\n");
|
|
for (byte = 0; byte < msgs[i].len; byte++) {
|
|
i2c_cont(1, " =");
|
|
rc = i2c_recv_byte(dev);
|
|
if (rc < 0)
|
|
goto err;
|
|
i2c_cont(1, "%02x", rc);
|
|
msgs[i].buf[byte] = rc;
|
|
}
|
|
/* discard mysterious extra byte when reading
|
|
from Samsung S5H1411. i2c bus gets error
|
|
if we do not. */
|
|
if (0x19 == msgs[i].addr) {
|
|
i2c_cont(1, " ?");
|
|
rc = i2c_recv_byte(dev);
|
|
if (rc < 0)
|
|
goto err;
|
|
i2c_cont(1, "%02x", rc);
|
|
}
|
|
} else {
|
|
/* write bytes */
|
|
i2c_dbg(2, "write bytes\n");
|
|
for (byte = 0; byte < msgs[i].len; byte++) {
|
|
data = msgs[i].buf[byte];
|
|
i2c_cont(1, " %02x", data);
|
|
rc = i2c_send_byte(dev,CONTINUE,data);
|
|
if (rc < 0)
|
|
goto err;
|
|
}
|
|
}
|
|
}
|
|
i2c_dbg(2, "xfer done\n");
|
|
i2c_cont(1, " >");
|
|
i2c_set_attr(dev,STOP);
|
|
rc = -EIO;
|
|
if (!i2c_is_busy_wait(dev))
|
|
goto err;
|
|
status = i2c_get_status(dev);
|
|
if (i2c_is_error(status))
|
|
goto err;
|
|
/* ensure that the bus is idle for at least one bit slot */
|
|
msleep(1);
|
|
|
|
i2c_cont(1, "\n");
|
|
return num;
|
|
err:
|
|
if (1 == i2c_debug) {
|
|
status = i2c_get_status(dev);
|
|
i2c_cont(1, " ERROR: %s\n", str_i2c_status[status]);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/* ----------------------------------------------------------- */
|
|
|
|
static u32 functionality(struct i2c_adapter *adap)
|
|
{
|
|
return I2C_FUNC_SMBUS_EMUL;
|
|
}
|
|
|
|
static const struct i2c_algorithm saa7134_algo = {
|
|
.master_xfer = saa7134_i2c_xfer,
|
|
.functionality = functionality,
|
|
};
|
|
|
|
static struct i2c_adapter saa7134_adap_template = {
|
|
.owner = THIS_MODULE,
|
|
.name = "saa7134",
|
|
.algo = &saa7134_algo,
|
|
};
|
|
|
|
static struct i2c_client saa7134_client_template = {
|
|
.name = "saa7134 internal",
|
|
};
|
|
|
|
/* ----------------------------------------------------------- */
|
|
|
|
/* On Medion 7134 reading EEPROM needs DVB-T demod i2c gate open */
|
|
static void saa7134_i2c_eeprom_md7134_gate(struct saa7134_dev *dev)
|
|
{
|
|
u8 subaddr = 0x7, dmdregval;
|
|
u8 data[2];
|
|
int ret;
|
|
struct i2c_msg i2cgatemsg_r[] = { {.addr = 0x08, .flags = 0,
|
|
.buf = &subaddr, .len = 1},
|
|
{.addr = 0x08,
|
|
.flags = I2C_M_RD,
|
|
.buf = &dmdregval, .len = 1}
|
|
};
|
|
struct i2c_msg i2cgatemsg_w[] = { {.addr = 0x08, .flags = 0,
|
|
.buf = data, .len = 2} };
|
|
|
|
ret = i2c_transfer(&dev->i2c_adap, i2cgatemsg_r, 2);
|
|
if ((ret == 2) && (dmdregval & 0x2)) {
|
|
pr_debug("%s: DVB-T demod i2c gate was left closed\n",
|
|
dev->name);
|
|
|
|
data[0] = subaddr;
|
|
data[1] = (dmdregval & ~0x2);
|
|
if (i2c_transfer(&dev->i2c_adap, i2cgatemsg_w, 1) != 1)
|
|
pr_err("%s: EEPROM i2c gate open failure\n",
|
|
dev->name);
|
|
}
|
|
}
|
|
|
|
static int
|
|
saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len)
|
|
{
|
|
unsigned char buf;
|
|
int i,err;
|
|
|
|
if (dev->board == SAA7134_BOARD_MD7134)
|
|
saa7134_i2c_eeprom_md7134_gate(dev);
|
|
|
|
dev->i2c_client.addr = 0xa0 >> 1;
|
|
buf = 0;
|
|
if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) {
|
|
pr_info("%s: Huh, no eeprom present (err=%d)?\n",
|
|
dev->name,err);
|
|
return -1;
|
|
}
|
|
if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) {
|
|
pr_warn("%s: i2c eeprom read error (err=%d)\n",
|
|
dev->name,err);
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < len; i += 16) {
|
|
int size = (len - i) > 16 ? 16 : len - i;
|
|
|
|
pr_info("i2c eeprom %02x: %*ph\n", i, size, &eedata[i]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static char *i2c_devs[128] = {
|
|
[ 0x20 ] = "mpeg encoder (saa6752hs)",
|
|
[ 0xa0 >> 1 ] = "eeprom",
|
|
[ 0xc0 >> 1 ] = "tuner (analog)",
|
|
[ 0x86 >> 1 ] = "tda9887",
|
|
[ 0x5a >> 1 ] = "remote control",
|
|
};
|
|
|
|
static void do_i2c_scan(struct i2c_client *c)
|
|
{
|
|
unsigned char buf;
|
|
int i,rc;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
|
|
c->addr = i;
|
|
rc = i2c_master_recv(c,&buf,0);
|
|
if (rc < 0)
|
|
continue;
|
|
pr_info("i2c scan: found device @ 0x%x [%s]\n",
|
|
i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
|
|
}
|
|
}
|
|
|
|
int saa7134_i2c_register(struct saa7134_dev *dev)
|
|
{
|
|
dev->i2c_adap = saa7134_adap_template;
|
|
dev->i2c_adap.dev.parent = &dev->pci->dev;
|
|
strcpy(dev->i2c_adap.name,dev->name);
|
|
dev->i2c_adap.algo_data = dev;
|
|
i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
|
|
i2c_add_adapter(&dev->i2c_adap);
|
|
|
|
dev->i2c_client = saa7134_client_template;
|
|
dev->i2c_client.adapter = &dev->i2c_adap;
|
|
|
|
saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata));
|
|
if (i2c_scan)
|
|
do_i2c_scan(&dev->i2c_client);
|
|
|
|
/* Instantiate the IR receiver device, if present */
|
|
saa7134_probe_i2c_ir(dev);
|
|
return 0;
|
|
}
|
|
|
|
int saa7134_i2c_unregister(struct saa7134_dev *dev)
|
|
{
|
|
i2c_del_adapter(&dev->i2c_adap);
|
|
return 0;
|
|
}
|