hwmon: (pmbus/ltc2978) Use pmbus_read_smbus_i2c_block_data for block commands

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The driver uses a mix of pmbus_read_smbus_i2c_block_data() and
i2c_smbus_read_i2c_block_data() for PMBus block commands.

Use pmbus_read_smbus_i2c_block_data() instead to enable the driver to work
I2C controllers which do not support both block commands.

Drop the functionality check to simplify the code and to trigger a return
with -EOPNOTSUPP if SMBus block commands are not supported.

As part of this patch, rework detection of LT7170 and LT7171. The return
length of pmbus_read_smbus_i2c_block_data() may be less than the requested
number of bytes, meaning the return length needs to be checked. Also,
checking for "LT7170-1" after checking for "LT7170" and checking for
"LT7171-1" after checking for "LT7171" is pointless since the first check
will already produce a match, so drop the second part of the check.

Cc: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
Cc: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

...

This commit is contained in:

Guenter Roeck 2026-08-01 18:54:05 -07:00

parent 5b3dfe24a1

commit 08007275d5

1 changed files with 9 additions and 12 deletions

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drivers/hwmon/pmbus/ltc2978.c

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