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device/i2c: Add i2c_read_bytes() API 

Add multi-bytes read support.

BRANCH=none
BUG=none
TEST=saw edid log and dev screen

Change-Id: I106be98e751e2a3b998ccaedb28f71f3c6e18994
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 94ee0b834947e8d971943aa24e61a9353c7b7306
Original-Change-Id: Iac5fe497da92b7d09383e0d6a04d98709aea5b20
Original-Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/325211
Original-Commit-Ready: Yidi Lin <yidi.lin@mediatek.com>
Original-Tested-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/13978
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Jitao Shi 2016-02-01 17:33:49 +08:00 committed by Patrick Georgi
parent 358f66a442
commit 5ffb6887c2
1 changed files with 22 additions and 0 deletions
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22
src/include/device/i2c.h
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@ -87,6 +87,28 @@ static inline int i2c_write_raw(unsigned bus, uint8_t chip, uint8_t *data,
return i2c_transfer(bus, &seg, 1);
}
/**
* Read multi-bytes with two segments in one frame
*
* [start][slave addr][w][register addr][start][slave addr][r][data...][stop]
*/
static inline int i2c_read_bytes(unsigned bus, uint8_t chip, uint8_t reg,
uint8_t *data, int len)
{
struct i2c_seg seg[2];
seg[0].read = 0;
seg[0].chip = chip;
seg[0].buf = &reg;
seg[0].len = 1;
seg[1].read = 1;
seg[1].chip = chip;
seg[1].buf = data;
seg[1].len = len;
return i2c_transfer(bus, seg, ARRAY_SIZE(seg));
}
/**
* Read a byte with two segments in one frame
*