commit 92e89eb5bd184c6bdd569a2bc905bce12cad488e
author Lei YU <mine260309@gmail.com> Wed Nov 06 18:08:25 2019 +0800
committer Lei YU <mine260309@gmail.com> Mon Dec 09 14:14:41 2019 +0800
tree 5f35ba6c7e2f4eac0d63cbba1d20984e43aab7c4
parent 7c2fbbb61ca9bbfecea2278d0368c4e02038db3d

i2c: Implement read function

Implement I2CDevice::read() by invoking i2c_smbus_read_xxx() APIs.
The code is referenced from i2c-tools' i2cget.c:

 https://github.com/ev3dev/i2c-tools/blob/ev3dev-stretch/tools/i2cget.c

Tested: Verify on Witherspoon that it reads the PSU ppgrade mode status
        register (1 byte) and CRC16 register (2 bytes) correctly.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I8759b6a35229f81120acf77f08429f7f79458b8b

tools/power-utils/test/test_updater.cpp

diff --git a/tools/power-utils/test/test_updater.cpp b/tools/power-utils/test/test_updater.cpp
index 4d051f7..d2dfd11 100644
--- a/tools/power-utils/test/test_updater.cpp
+++ b/tools/power-utils/test/test_updater.cpp
@@ -95,7 +95,10 @@
     updater = std::make_unique<Updater>(psuInventoryPath, devPath, imageDir);
     updater->createI2CDevice();
     auto& i2c = getMockedI2c();
+    EXPECT_CALL(i2c, read(An<uint8_t&>()));
     EXPECT_CALL(i2c, read(_, An<uint8_t&>()));
+    EXPECT_CALL(i2c, read(_, An<uint16_t&>()));
+    EXPECT_CALL(i2c, read(_, An<uint8_t&>(), _));
     updater->doUpdate();
 }