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| author | Sheng-Liang Song <ssl@chromium.org> | 2014-07-24 09:22:11 -0700 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2014-08-29 02:57:00 +0000 |
| commit | 7bea5174a19b6d3b4cd9f5a7e96f7d492a24fc8f (patch) | |
| tree | 4bf5f92421086f20668dd19d85ee129cfd6e93f7 /chip/host | |
| parent | b7f1d5261917c88e734d0e788de74b2bc419c431 (diff) | |
| download | chrome-ec-7bea5174a19b6d3b4cd9f5a7e96f7d492a24fc8f.tar.gz | |
EC: Add smbus interface read & write APIs
Ref: http://smbus.org/specs/smbus20.pdf
- Support software CRC8 generation and checking.
- Support read/write word (2-bytes)
- Support read/write blocks (up to 32 bytes)
BUG=chrome-os-partner:24741
BRANCH=ToT,glimmer
TEST=Verified with smart battery firmware update application on glimmer.
Passed LGC & Simplo Battery.
Change-Id: Ic2e7f759af80c06741ed49fee1826213429fbf8a
Signed-off-by: Sheng-Liang Song <ssl@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/209747
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Diffstat (limited to 'chip/host')
| -rw-r--r-- | chip/host/i2c.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/chip/host/i2c.c b/chip/host/i2c.c index 3f8a8b8241..1ce7da9340 100644 --- a/chip/host/i2c.c +++ b/chip/host/i2c.c @@ -150,3 +150,24 @@ int i2c_read_string(int port, int slave_addr, int offset, uint8_t *data, } return EC_ERROR_UNKNOWN; } + +int smbus_write_word(uint8_t i2c_port, uint8_t slave_addr, + uint8_t smbus_cmd, uint16_t d16) +{ + return i2c_write16(i2c_port, slave_addr, smbus_cmd, d16); +} + +int smbus_read_word(uint8_t i2c_port, uint8_t slave_addr, + uint8_t smbus_cmd, uint16_t *p16) +{ + int rv, d16 = 0; + rv = i2c_read16(i2c_port, slave_addr, smbus_cmd, &d16); + *p16 = d16; + return rv; +} + +int smbus_read_string(int i2c_port, uint8_t slave_addr, uint8_t smbus_cmd, + uint8_t *data, int len) +{ + return i2c_read_string(i2c_port, slave_addr, smbus_cmd, data, len); +} |