i2c: Support 16-bit address register read & write

wireless receiver charger IDT P9221 I2C reg addr is 16bit.

command
      i2cxfer r/r16/w/w16 port offset [value]

When offset is 4 digit (e.g. 0x00ab), it reads/writes 16 bit offset
registers. Otherwise, it reads/writes 8-bit offset registers.

BRANCH=none
BUG=b:123504007
TEST=1:) Build flapjack EC and flash to DUT ,
         EC can read/write P9221 register.
     2:) Build kukui EC , build pass.
TEST=buildall

Change-Id: If0df532f5ca136bf1312a1857b13e8455e897943
Reviewed-on: https://chromium-review.googlesource.com/1445133
Commit-Ready: Tony Zou <zoutao@huaqin.corp-partner.google.com>
Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/include/i2c.h b/include/i2c.h
index bb7f28000d..b749d04b08 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -265,6 +265,35 @@ int i2c_read8(int port, int slave_addr, int offset, int *data);
 int i2c_write8(int port, int slave_addr, int offset, int data);
 
 /**
+ * Read one or two bytes data from the slave at 8-bit slave address
+ * * <slaveaddr>, at 16-bit <offset> in the slave's address space.
+ */
+int i2c_read_offset16(int port, int slave_addr, uint16_t offset,
+                        int *data, int len);
+
+/**
+ * Write one or two bytes data to the slave at 8-bit slave address
+ * <slaveaddr>, at 16-bit <offset> in the slave's address space.
+ */
+int i2c_write_offset16(int port, int slave_addr, uint16_t offset,
+                        int data, int len);
+
+/**
+ * Read <len> bytes block data from the slave at 8-bit slave address
+ * * <slaveaddr>, at 16-bit <offset> in the slave's address space.
+ */
+int i2c_read_offset16_block(int port, int slave_addr, uint16_t offset,
+			uint8_t *data, int len);
+
+/**
+ * Write <len> bytes block data to the slave at 8-bit slave address
+ * <slaveaddr>, at 16-bit <offset> in the slave's address space.
+ */
+int i2c_write_offset16_block(int port, int slave_addr, uint16_t offset,
+			const uint8_t *data, int len);
+
+
+/**
  * @return non-zero if i2c bus is busy
  */
 int i2c_is_busy(int port);