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hwmon: (pmbus/ibm-cffps) max_power_out swap changes

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[ Upstream commit f067d5585c ]

The bytes for max_power_out from the ibm-cffps devices differ in byte
order for some power supplies.

The Witherspoon power supply returns the bytes in MSB/LSB order.

The Rainier power supply returns the bytes in LSB/MSB order.

The Witherspoon power supply uses version cffps1. The Rainier power
supply should use version cffps2. If version is cffps1, swap the bytes
before output to max_power_out.

Tested:
    Witherspoon before: 3148. Witherspoon after: 3148.
    Rainier before: 53255. Rainier after: 2000.

Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
Reviewed-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20210928205051.1222815-1-bjwyman@gmail.com
[groeck: Replaced yoda programming]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Brandon Wyman 2021-09-28 20:50:51 +00:00 committed by Greg Kroah-Hartman
parent bb893f0754
commit 42b49f012b
1 changed files with 8 additions and 2 deletions
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10
drivers/hwmon/pmbus/ibm-cffps.c
View file

@ -171,8 +171,14 @@ static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
cmd = CFFPS_SN_CMD;
break;
case CFFPS_DEBUGFS_MAX_POWER_OUT:
rc = i2c_smbus_read_word_swapped(psu->client,
CFFPS_MAX_POWER_OUT_CMD);
if (psu->version == cffps1) {
rc = i2c_smbus_read_word_swapped(psu->client,
CFFPS_MAX_POWER_OUT_CMD);
} else {
rc = i2c_smbus_read_word_data(psu->client,
CFFPS_MAX_POWER_OUT_CMD);
}
if (rc < 0)
return rc;