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hwmon: (pmbus/zl6100) Only instantiate external temperature sensor if enabled 

BMR4xx devices don't have an external temperature sensor,
and instantiating it does not provide value anyway if it is disabled.
Only instantiate it if it is enabled.

Also optimize wait time between I2C chip accesses in the probe function, and
replace unnecessary check for support for I2C_FUNC_SMBUS_READ_BYTE_DATA with
now required support for I2C_FUNC_SMBUS_READ_WORD_DATA.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
This commit is contained in:
Guenter Roeck 2011-10-04 17:26:04 -07:00
parent 443830f6fd
commit 56badacb92
1 changed files with 14 additions and 5 deletions
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19
drivers/hwmon/pmbus/zl6100.c
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@ -38,8 +38,11 @@ struct zl6100_data {
#define to_zl6100_data(x) container_of(x, struct zl6100_data, info)
#define ZL6100_MFR_CONFIG 0xd0
#define ZL6100_DEVICE_ID 0xe4
#define ZL6100_MFR_XTEMP_ENABLE (1 << 7)
#define ZL6100_WAIT_TIME 1000 /* uS */
static ushort delay = ZL6100_WAIT_TIME;
@ -162,7 +165,7 @@ static int zl6100_probe(struct i2c_client *client,
const struct i2c_device_id *mid;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA
I2C_FUNC_SMBUS_READ_WORD_DATA
| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
return -ENODEV;
@ -210,12 +213,9 @@ static int zl6100_probe(struct i2c_client *client,
/*
* Since there was a direct I2C device access above, wait before
* accessing the chip again.
* Set the timestamp, wait, then set it again. This should provide
* enough buffer time to be safe.
*/
data->access = ktime_get();
zl6100_wait(data);
data->access = ktime_get();
info = &data->info;
@ -223,7 +223,16 @@ static int zl6100_probe(struct i2c_client *client,
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
if (ret < 0)
goto err_mem;
if (ret & ZL6100_MFR_XTEMP_ENABLE)
info->func[0] |= PMBUS_HAVE_TEMP2;
data->access = ktime_get();
zl6100_wait(data);
info->read_word_data = zl6100_read_word_data;
info->read_byte_data = zl6100_read_byte_data;