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>
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@ -391,6 +391,21 @@ static int readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
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};
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scllo(adap);
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sdahi(adap);
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/* Some SMBus transactions require that we receive the
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transaction length as the first read byte. */
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if (rdcount == 1 && (msg->flags & I2C_M_RECV_LEN)) {
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if (inval <= 0 || inval > I2C_SMBUS_BLOCK_MAX) {
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printk(KERN_ERR "i2c-algo-bit: readbytes: "
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"invalid block length (%d)\n", inval);
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return -EREMOTEIO;
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}
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/* The original count value accounts for the extra
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bytes, that is, either 1 for a regular transaction,
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or 2 for a PEC transaction. */
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count += inval;
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msg->len += inval;
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}
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}
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return rdcount;
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}
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@ -509,6 +524,8 @@ bailout:
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static u32 bit_func(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
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I2C_FUNC_SMBUS_READ_BLOCK_DATA |
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I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
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I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING;
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}
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