Contributors: 20
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Gerd Knorr |
1650 |
76.14% |
7 |
17.95% |
| Maciej S. Szmigiero |
206 |
9.51% |
2 |
5.13% |
| Mauro Carvalho Chehab |
130 |
6.00% |
10 |
25.64% |
| Andrew Morton |
64 |
2.95% |
2 |
5.13% |
| Oldřich Jedlička |
25 |
1.15% |
1 |
2.56% |
| Kyle Strickland |
23 |
1.06% |
1 |
2.56% |
| Richard Knutsson |
12 |
0.55% |
1 |
2.56% |
| Jean Delvare |
11 |
0.51% |
2 |
5.13% |
| Andrey J. Melnikoff (TEMHOTA) |
8 |
0.37% |
1 |
2.56% |
| Hartmut Hackmann |
7 |
0.32% |
1 |
2.56% |
| Dmitry Belimov |
6 |
0.28% |
1 |
2.56% |
| Hans Verkuil |
6 |
0.28% |
1 |
2.56% |
| Rusty Russell |
6 |
0.28% |
1 |
2.56% |
| Christoph Hellwig |
5 |
0.23% |
1 |
2.56% |
| Thomas Gleixner |
2 |
0.09% |
1 |
2.56% |
| Bhumika Goyal |
2 |
0.09% |
2 |
5.13% |
| Michael Ira Krufky |
1 |
0.05% |
1 |
2.56% |
| Mickey Stein |
1 |
0.05% |
1 |
2.56% |
| Ondrej Zary |
1 |
0.05% |
1 |
2.56% |
| Julia Lawall |
1 |
0.05% |
1 |
2.56% |
| Total |
2167 |
|
39 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* device driver for philips saa7134 based TV cards
* i2c interface support
*
* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
*/
#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 const struct i2c_adapter saa7134_adap_template = {
.owner = THIS_MODULE,
.name = "saa7134",
.algo = &saa7134_algo,
};
static const struct i2c_client saa7134_client_template = {
.name = "saa7134 internal",
};
/* ----------------------------------------------------------- */
/*
* On Medion 7134 reading the SAA7134 chip config EEPROM needs DVB-T
* demod i2c gate closed due to an address clash between this EEPROM
* and the demod one.
*/
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 open\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 close 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;
strscpy(dev->i2c_adap.name, dev->name, sizeof(dev->i2c_adap.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;
}