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>

diff --git a/drivers/hwmon/pmbus/zl6100.c b/drivers/hwmon/pmbus/zl6100.c
index 7a72b6e4ff1dcd0735878d20a0b7ae8a96f8c9e5..48c7b4a716ae49dfec79a51ff3ac0362849973cd 100644 (file)
--- a/drivers/hwmon/pmbus/zl6100.c
+++ b/drivers/hwmon/pmbus/zl6100.c
@@ -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;