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hwmon: (w83792d) Clean up detect function 

As kind is now hard-coded to -1, there is room for code clean-ups.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
hifive-unleashed-5.1
Jean Delvare 2009-12-09 20:35:56 +01:00
parent 3f8b845940
commit 2de1875a58
1 changed files with 20 additions and 45 deletions
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65
drivers/hwmon/w83792d.c
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@ -1273,58 +1273,33 @@ w83792d_detect(struct i2c_client *client, int kind, struct i2c_board_info *info)
return -ENODEV;
}
/* The w83792d may be stuck in some other bank than bank 0. This may
make reading other information impossible. Specify a force=... or
force_*=... parameter, and the Winbond will be reset to the right
bank. */
if (kind < 0) {
if (w83792d_read_value(client, W83792D_REG_CONFIG) & 0x80) {
return -ENODEV;
}
val1 = w83792d_read_value(client, W83792D_REG_BANK);
val2 = w83792d_read_value(client, W83792D_REG_CHIPMAN);
/* Check for Winbond ID if in bank 0 */
if (!(val1 & 0x07)) { /* is Bank0 */
if (((!(val1 & 0x80)) && (val2 != 0xa3)) ||
((val1 & 0x80) && (val2 != 0x5c))) {
return -ENODEV;
}
}
/* If Winbond chip, address of chip and W83792D_REG_I2C_ADDR
should match */
if (w83792d_read_value(client,
W83792D_REG_I2C_ADDR) != address) {
return -ENODEV;
}
}
if (w83792d_read_value(client, W83792D_REG_CONFIG) & 0x80)
return -ENODEV;
/* We have either had a force parameter, or we have already detected the
Winbond. Put it now into bank 0 and Vendor ID High Byte */
val1 = w83792d_read_value(client, W83792D_REG_BANK);
val2 = w83792d_read_value(client, W83792D_REG_CHIPMAN);
/* Check for Winbond ID if in bank 0 */
if (!(val1 & 0x07)) { /* is Bank0 */
if ((!(val1 & 0x80) && val2 != 0xa3) ||
( (val1 & 0x80) && val2 != 0x5c))
return -ENODEV;
}
/* If Winbond chip, address of chip and W83792D_REG_I2C_ADDR
should match */
if (w83792d_read_value(client, W83792D_REG_I2C_ADDR) != address)
return -ENODEV;
/* Put it now into bank 0 and Vendor ID High Byte */
w83792d_write_value(client,
W83792D_REG_BANK,
(w83792d_read_value(client,
W83792D_REG_BANK) & 0x78) | 0x80);
/* Determine the chip type. */
if (kind <= 0) {
/* get vendor ID */
val2 = w83792d_read_value(client, W83792D_REG_CHIPMAN);
if (val2 != 0x5c) { /* the vendor is NOT Winbond */
return -ENODEV;
}
val1 = w83792d_read_value(client, W83792D_REG_WCHIPID);
if (val1 == 0x7a) {
kind = w83792d;
} else {
if (kind == 0)
dev_warn(&adapter->dev,
"w83792d: Ignoring 'force' parameter for"
" unknown chip at adapter %d, address"
" 0x%02x\n", i2c_adapter_id(adapter),
address);
return -ENODEV;
}
}
val1 = w83792d_read_value(client, W83792D_REG_WCHIPID);
val2 = w83792d_read_value(client, W83792D_REG_CHIPMAN);
if (val1 != 0x7a || val2 != 0x5c)
return -ENODEV;
strlcpy(info->type, "w83792d", I2C_NAME_SIZE);