static int lm78_i2c_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
int i;
struct lm78_data *isa = lm78_data_if_isa();
const char *client_name;
struct i2c_adapter *adapter = client->adapter;
int address = client->addr;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
/*
* We block updates of the ISA device to minimize the risk of
* concurrent access to the same LM78 chip through different
* interfaces.
*/
if (isa)
mutex_lock(&isa->update_lock);
if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
|| i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
goto err_nodev;
/* Explicitly prevent the misdetection of Winbond chips */
i = i2c_smbus_read_byte_data(client, 0x4f);
if (i == 0xa3 || i == 0x5c)
goto err_nodev;
/* Determine the chip type. */
i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
if (i == 0x00 || i == 0x20 /* LM78 */
|| i == 0x40) /* LM78-J */
client_name = "lm78";
else if ((i & 0xfe) == 0xc0)
client_name = "lm79";
else
goto err_nodev;
if (lm78_alias_detect(client, i)) {
dev_dbg(&adapter->dev,
"Device at 0x%02x appears to be the same as ISA device\n",
address);
goto err_nodev;
}
if (isa)
mutex_unlock(&isa->update_lock);
strlcpy(info->type, client_name, I2C_NAME_SIZE);
return 0;
err_nodev:
if (isa)
mutex_unlock(&isa->update_lock);
return -ENODEV;
}
static int lm78_i2c_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
int i;
struct lm78_data *isa = lm78_data_if_isa();
const char *client_name;
struct i2c_adapter *adapter = client->adapter;
int address = client->addr;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
if (isa)
mutex_lock(&isa->update_lock);
if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
|| i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
goto err_nodev;
i = i2c_smbus_read_byte_data(client, 0x4f);
if (i == 0xa3 || i == 0x5c)
goto err_nodev;
i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
if (i == 0x00 || i == 0x20
|| i == 0x40)
client_name = "lm78";
else if ((i & 0xfe) == 0xc0)
client_name = "lm79";
else
goto err_nodev;
if (lm78_alias_detect(client, i)) {
dev_dbg(&adapter->dev, "Device at 0x%02x appears to "
"be the same as ISA device\n", address);
goto err_nodev;
}
if (isa)
mutex_unlock(&isa->update_lock);
strlcpy(info->type, client_name, I2C_NAME_SIZE);
return 0;
err_nodev:
if (isa)
mutex_unlock(&isa->update_lock);
return -ENODEV;
}
static int lm78_i2c_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info)
{
int i;
struct lm78_data *isa = lm78_data_if_isa();
const char *client_name;
struct i2c_adapter *adapter = client->adapter;
int address = client->addr;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
/* We block updates of the ISA device to minimize the risk of
concurrent access to the same LM78 chip through different
interfaces. */
if (isa)
mutex_lock(&isa->update_lock);
if (kind < 0) {
if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
|| i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR)
!= address)
goto err_nodev;
/* Explicitly prevent the misdetection of Winbond chips */
i = i2c_smbus_read_byte_data(client, 0x4f);
if (i == 0xa3 || i == 0x5c)
goto err_nodev;
}
/* Determine the chip type. */
if (kind <= 0) {
i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
if (i == 0x00 || i == 0x20 /* LM78 */
|| i == 0x40) /* LM78-J */
kind = lm78;
else if ((i & 0xfe) == 0xc0)
kind = lm79;
else {
if (kind == 0)
dev_warn(&adapter->dev, "Ignoring 'force' "
"parameter for unknown chip at "
"adapter %d, address 0x%02x\n",
i2c_adapter_id(adapter), address);
goto err_nodev;
}
if (lm78_alias_detect(client, i)) {
dev_dbg(&adapter->dev, "Device at 0x%02x appears to "
"be the same as ISA device\n", address);
goto err_nodev;
}
}
if (isa)
mutex_unlock(&isa->update_lock);
switch (kind) {
case lm79:
client_name = "lm79";
break;
default:
client_name = "lm78";
}
strlcpy(info->type, client_name, I2C_NAME_SIZE);
return 0;
err_nodev:
if (isa)
mutex_unlock(&isa->update_lock);
return -ENODEV;
}
