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| author | Matt Johnston <matt@codeconstruct.com.au> | 2021-11-15 10:49:22 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-11-15 14:11:24 +0000 |
| commit | 84a107e68b34217eff536e81a6a6f419ee0d0f7e (patch) | |
| tree | 3beaf1ebf78e6a4330445b81b4dba7b78dc8b453 /include/uapi/linux/i2c.h | |
| parent | 13cae4a104d2b7205696229ba85d34cc035f8c84 (diff) | |
| download | cachepc-linux-84a107e68b34217eff536e81a6a6f419ee0d0f7e.tar.gz cachepc-linux-84a107e68b34217eff536e81a6a6f419ee0d0f7e.zip | |
i2c: dev: Handle 255 byte blocks for i2c ioctl
I2C_SMBUS is limited to 32 bytes due to compatibility with the
32 byte i2c_smbus_data.block
I2C_RDWR allows larger transfers if sufficient sized buffers are passed.
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/uapi/linux/i2c.h')
| -rw-r--r-- | include/uapi/linux/i2c.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/i2c.h b/include/uapi/linux/i2c.h index 7b7d90b50cf0..c3534ab1ae53 100644 --- a/include/uapi/linux/i2c.h +++ b/include/uapi/linux/i2c.h @@ -109,6 +109,8 @@ struct i2c_msg { #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ #define I2C_FUNC_SMBUS_HOST_NOTIFY 0x10000000 /* SMBus 2.0 or later */ #define I2C_FUNC_SMBUS_V3_BLOCK 0x20000000 /* Device supports 255 byte block */ + /* Note that I2C_SMBUS ioctl only */ + /* supports a 32 byte block */ #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ I2C_FUNC_SMBUS_WRITE_BYTE) |