New patch to review for coreboot: device/i2c: Add i2c_read_bytes() API

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/13978

-gerrit

commit f434ce5218fb46b402fe4fdc92b7610884fa069d
Author: Jitao Shi 
Date:   Mon Feb 1 17:33:49 2016 +0800

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 
    Original-Commit-Id: 94ee0b834947e8d971943aa24e61a9353c7b7306
    Original-Change-Id: Iac5fe497da92b7d09383e0d6a04d98709aea5b20
    Original-Signed-off-by: Jitao Shi 
    Original-Reviewed-on: https://chromium-review.googlesource.com/325211
    Original-Commit-Ready: Yidi Lin 
    Original-Tested-by: Yidi Lin 
    Original-Reviewed-by: Julius Werner 
---
 src/include/device/i2c.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/include/device/i2c.h b/src/include/device/i2c.h
index 78817bb..8e59ba7 100644
--- a/src/include/device/i2c.h
+++ b/src/include/device/i2c.h
@@ -88,6 +88,28 @@ static inline int i2c_write_raw(unsigned bus, uint8_t chip, uint8_t *data,
 }

/**
+ * 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  = ®
+	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
  *
  * [start][slave addr][w][register addr][start][slave addr][r][data][stop]