i2c: pmcmsp: use core to detect 'no zero length' quirk

And don't reimplement in the driver.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-pmcmsp.c b/drivers/i2c/busses/i2c-pmcmsp.c
index dae8ac6..0829cb6 100644 (file)
--- a/drivers/i2c/busses/i2c-pmcmsp.c
+++ b/drivers/i2c/busses/i2c-pmcmsp.c
@@ -444,16 +444,6 @@ static enum pmcmsptwi_xfer_result pmcmsptwi_xfer_cmd(
 {
        enum pmcmsptwi_xfer_result retval;
 
-       if ((cmd->type == MSP_TWI_CMD_WRITE && cmd->write_len == 0) ||
-           (cmd->type == MSP_TWI_CMD_READ && cmd->read_len == 0) ||
-           (cmd->type == MSP_TWI_CMD_WRITE_READ &&
-           (cmd->read_len == 0 || cmd->write_len == 0))) {
-               dev_err(&pmcmsptwi_adapter.dev,
-                       "%s: Cannot transfer less than 1 byte\n",
-                       __func__);
-               return -EINVAL;
-       }
-
        mutex_lock(&data->lock);
        dev_dbg(&pmcmsptwi_adapter.dev,
                "Setting address to 0x%04x\n", cmd->addr);
@@ -532,11 +522,6 @@ static int pmcmsptwi_master_xfer(struct i2c_adapter *adap,
                cmd.write_data = msg->buf;
        }
 
-       if (msg->len == 0) {
-               dev_err(&adap->dev, "Zero-byte messages unsupported\n");
-               return -EINVAL;
-       }
-
        cmd.addr = msg->addr;
 
        if (msg->flags & I2C_M_TEN) {
@@ -578,7 +563,7 @@ static u32 pmcmsptwi_i2c_func(struct i2c_adapter *adapter)
 }
 
 static const struct i2c_adapter_quirks pmcmsptwi_i2c_quirks = {
-       .flags = I2C_AQ_COMB_WRITE_THEN_READ,
+       .flags = I2C_AQ_COMB_WRITE_THEN_READ | I2C_AQ_NO_ZERO_LEN,
        .max_write_len = MSP_MAX_BYTES_PER_RW,
        .max_read_len = MSP_MAX_BYTES_PER_RW,
        .max_comb_1st_msg_len = MSP_MAX_BYTES_PER_RW,