mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 14:42:24 +00:00
i2c-algo-bit: Emulate SMBus block read
Now that i2c-core lets the i2c bus drivers emulate the SMBus block read and SMBus block process call transaction types, let's implement that in the popular i2c bit-banging driver. This will also act as a reference implementation for other bus drivers which want to do the same. Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
parent
209d27c3b1
commit
3c4bb241d3
@ -391,6 +391,21 @@ static int readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
|
||||
};
|
||||
scllo(adap);
|
||||
sdahi(adap);
|
||||
|
||||
/* Some SMBus transactions require that we receive the
|
||||
transaction length as the first read byte. */
|
||||
if (rdcount == 1 && (msg->flags & I2C_M_RECV_LEN)) {
|
||||
if (inval <= 0 || inval > I2C_SMBUS_BLOCK_MAX) {
|
||||
printk(KERN_ERR "i2c-algo-bit: readbytes: "
|
||||
"invalid block length (%d)\n", inval);
|
||||
return -EREMOTEIO;
|
||||
}
|
||||
/* The original count value accounts for the extra
|
||||
bytes, that is, either 1 for a regular transaction,
|
||||
or 2 for a PEC transaction. */
|
||||
count += inval;
|
||||
msg->len += inval;
|
||||
}
|
||||
}
|
||||
return rdcount;
|
||||
}
|
||||
@ -509,6 +524,8 @@ bailout:
|
||||
static u32 bit_func(struct i2c_adapter *adap)
|
||||
{
|
||||
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
|
||||
I2C_FUNC_SMBUS_READ_BLOCK_DATA |
|
||||
I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
|
||||
I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING;
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user