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i2c: testunit: add support for block process calls

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Devices offering SMBus block process calls are rare, so add it to the
testunit. This is also a good test case for testing proper
I2C_M_RECV_LEN flag handling of I2C bus masters emulating SMBus.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Wolfram Sang
2021-02-09 12:19:27 +01:00
committed by Wolfram Sang
parent bb3fe9ff53
commit b39ab96aa8
2 changed files with 31 additions and 4 deletions
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12
drivers/i2c/i2c-slave-testunit.c
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@@ -19,6 +19,7 @@
enum testunit_cmds {
TU_CMD_READ_BYTES = 1, /* save 0 for ABORT, RESET or similar */
TU_CMD_HOST_NOTIFY,
TU_CMD_SMBUS_BLOCK_PROC_CALL,
TU_NUM_CMDS
};
@@ -88,6 +89,8 @@ static int i2c_slave_testunit_slave_cb(struct i2c_client *client,
enum i2c_slave_event event, u8 *val)
{
struct testunit_data *tu = i2c_get_clientdata(client);
bool is_proc_call = tu->reg_idx == 3 && tu->regs[TU_REG_DATAL] == 1 &&
tu->regs[TU_REG_CMD] == TU_CMD_SMBUS_BLOCK_PROC_CALL;
int ret = 0;
switch (event) {
@@ -118,12 +121,17 @@ static int i2c_slave_testunit_slave_cb(struct i2c_client *client,
fallthrough;
case I2C_SLAVE_WRITE_REQUESTED:
memset(tu->regs, 0, TU_NUM_REGS);
tu->reg_idx = 0;
break;
case I2C_SLAVE_READ_REQUESTED:
case I2C_SLAVE_READ_PROCESSED:
*val = TU_CUR_VERSION;
if (is_proc_call && tu->regs[TU_REG_DATAH])
tu->regs[TU_REG_DATAH]--;
fallthrough;
case I2C_SLAVE_READ_REQUESTED:
*val = is_proc_call ? tu->regs[TU_REG_DATAH] : TU_CUR_VERSION;
break;
}