diff options
| author | Chu Lin <linchuyuan@google.com> | 2020-07-09 04:06:12 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-29 10:18:38 +0200 |
| commit | c04a482513141a0e7145c6c1bdcac9a08f8326c0 (patch) | |
| tree | a09d0a891974f36192b9bbd283f306081f048340 | |
| parent | a2a380bd45750480072cf45ca1ad584f9baf5301 (diff) | |
hwmon: (adm1275) Make sure we are reading enough data for different chips
[ Upstream commit 6d1d41c075a1a54ba03370e268171fec20e06563 ]
Issue:
When PEC is enabled, binding adm1272 to the adm1275 would
fail due to PEC error. See below:
adm1275: probe of xxxx failed with error -74
Diagnosis:
Per the datasheet of adm1272, adm1278, adm1293 and amd1294,
PMON_CONFIG (0xd4) is 16bits wide. On the other hand,
PMON_CONFIG (0xd4) for adm1275 is 8bits wide. The driver should not
assume everything is 8bits wide and read only 8bits from it.
Solution:
If it is adm1272, adm1278, adm1293 and adm1294, use i2c_read_word.
Else, use i2c_read_byte
Testing:
Binding adm1272 to the driver.
The change is only tested on adm1272.
Signed-off-by: Chu Lin <linchuyuan@google.com>
Link: https://lore.kernel.org/r/20200709040612.3977094-1-linchuyuan@google.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/hwmon/pmbus/adm1275.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c index 5caa37fbfc18..66b12e5ccbc6 100644 --- a/drivers/hwmon/pmbus/adm1275.c +++ b/drivers/hwmon/pmbus/adm1275.c @@ -454,6 +454,7 @@ MODULE_DEVICE_TABLE(i2c, adm1275_id); static int adm1275_probe(struct i2c_client *client, const struct i2c_device_id *id) { + s32 (*config_read_fn)(const struct i2c_client *client, u8 reg); u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; int config, device_config; int ret; @@ -499,11 +500,16 @@ static int adm1275_probe(struct i2c_client *client, "Device mismatch: Configured %s, detected %s\n", id->name, mid->name); - config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG); + if (mid->driver_data == adm1272 || mid->driver_data == adm1278 || + mid->driver_data == adm1293 || mid->driver_data == adm1294) + config_read_fn = i2c_smbus_read_word_data; + else + config_read_fn = i2c_smbus_read_byte_data; + config = config_read_fn(client, ADM1275_PMON_CONFIG); if (config < 0) return config; - device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG); + device_config = config_read_fn(client, ADM1275_DEVICE_CONFIG); if (device_config < 0) return device_config; |