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hwmon: (ltc2978) Move code to read chip ID into separate function

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Verifying the chip type is getting more complicated with new chips,
since not all chips support the same mechanism to read the chip type.
Move the code into a separate function to simplify adding support for
those chips.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2015-06-08 10:14:00 -07:00
parent 33836ee985
commit 836954dadc
1 changed files with 29 additions and 19 deletions
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48
drivers/hwmon/pmbus/ltc2978.c
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@ -388,10 +388,36 @@ static const struct regulator_desc ltc2978_reg_desc[] = {
};
#endif /* CONFIG_SENSORS_LTC2978_REGULATOR */
static int ltc2978_get_id(struct i2c_client *client)
{
int chip_id;
chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID);
if (chip_id < 0)
return chip_id;
if (chip_id == LTC2974_ID_REV1 || chip_id == LTC2974_ID_REV2)
return ltc2974;
else if (chip_id == LTC2977_ID)
return ltc2977;
else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2 ||
chip_id == LTC2978A_ID)
return ltc2978;
else if ((chip_id & LTC3880_ID_MASK) == LTC3880_ID)
return ltc3880;
else if ((chip_id & LTC3883_ID_MASK) == LTC3883_ID)
return ltc3883;
else if ((chip_id & LTM4676_ID_MASK) == LTM4676_ID)
return ltm4676;
dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
return -ENODEV;
}
static int ltc2978_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int chip_id, i;
int i, chip_id;
struct ltc2978_data *data;
struct pmbus_driver_info *info;
@ -404,27 +430,11 @@ static int ltc2978_probe(struct i2c_client *client,
if (!data)
return -ENOMEM;
chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID);
chip_id = ltc2978_get_id(client);
if (chip_id < 0)
return chip_id;
if (chip_id == LTC2974_ID_REV1 || chip_id == LTC2974_ID_REV2) {
data->id = ltc2974;
} else if (chip_id == LTC2977_ID) {
data->id = ltc2977;
} else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2 ||
chip_id == LTC2978A_ID) {
data->id = ltc2978;
} else if ((chip_id & LTC3880_ID_MASK) == LTC3880_ID) {
data->id = ltc3880;
} else if ((chip_id & LTC3883_ID_MASK) == LTC3883_ID) {
data->id = ltc3883;
} else if ((chip_id & LTM4676_ID_MASK) == LTM4676_ID) {
data->id = ltm4676;
} else {
dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
return -ENODEV;
}
data->id = chip_id;
if (data->id != id->driver_data)
dev_warn(&client->dev,
"Device mismatch: Configured %s, detected %s\n",