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| author | Zhangfei Gao <zgao6@marvell.com> | 2010-03-02 12:23:49 +0100 |
|---|---|---|
| committer | Jean Delvare <khali@linux-fr.org> | 2010-03-02 12:23:49 +0100 |
| commit | 0c43ea544c1086fbbed5a6c99ea58eb64674ea8f (patch) | |
| tree | 1d50d78c261cd011667c12134d93f2d6d2caa6e5 /Documentation/i2c | |
| parent | eec74a257f0a695688ba44c0f6c1e92dc81459be (diff) | |
| download | lwn-0c43ea544c1086fbbed5a6c99ea58eb64674ea8f.tar.gz lwn-0c43ea544c1086fbbed5a6c99ea58eb64674ea8f.zip | |
i2c: Document the message size limit
i2c_master_send & i2c_master_recv do not support more than 64 kb
transfer, since msg.len is u16.
Signed-off-by: Zhangfei Gao <zgao6@marvell.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'Documentation/i2c')
| -rw-r--r-- | Documentation/i2c/writing-clients | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/i2c/writing-clients b/Documentation/i2c/writing-clients index 0a74603eb671..3219ee0dbfef 100644 --- a/Documentation/i2c/writing-clients +++ b/Documentation/i2c/writing-clients @@ -318,8 +318,9 @@ Plain I2C communication These routines read and write some bytes from/to a client. The client contains the i2c address, so you do not have to include it. The second parameter contains the bytes to read/write, the third the number of bytes -to read/write (must be less than the length of the buffer.) Returned is -the actual number of bytes read/written. +to read/write (must be less than the length of the buffer, also should be +less than 64k since msg.len is u16.) Returned is the actual number of bytes +read/written. int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msg, int num); |