Signed-off-by: Andrey Danin<danindrey@xxxxxxx>
CC: Stephen Warren<swarren@xxxxxxxxxx>
CC: Marc Dietrich<marvin24@xxxxxx>
CC: Julian Andres Klode<jak@xxxxxxxxxxxxx>
CC: ac100@xxxxxxxxxxxxxxxxxxx
---
drivers/i2c/i2c_core.c | 13 +++++++++++++
include/i2c.h | 30 +++++++++++++++++++++++++++++-
2 files changed, 42 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/i2c_core.c b/drivers/i2c/i2c_core.c
index 18d6736..105aa0a 100644
--- a/drivers/i2c/i2c_core.c
+++ b/drivers/i2c/i2c_core.c
@@ -395,6 +395,19 @@ void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val)
i2c_write(addr, reg, 1,&val, 1);
}
+int i2c_slave_io(struct i2c_transaction *trans)
+{
+ struct i2c_adapter *cur = I2C_ADAP;
+
+ if (!cur->slave_io) {
+ printf("Error: slave IO is not supported on adap %d\n",
+ cur->hwadapnr);
+ return -1;
+ }
+
+ return cur->slave_io(cur, trans);
+}
+
void __i2c_init(int speed, int slaveaddr)
{
i2c_init_bus(i2c_get_bus_num(), speed, slaveaddr);
diff --git a/include/i2c.h b/include/i2c.h
index f93a183..165b919 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -55,6 +55,20 @@
#define CONFIG_SYS_SPD_BUS_NUM 0
#endif
+struct i2c_transaction {
+ char rx_buf[34];
+ int rx_pos;
+
+ char tx_buf[34];
+ int tx_pos;
+ int tx_size;
+
+ unsigned int start_timeout;
+ unsigned int timeout;
+
+ int res;
+};
+
struct i2c_adapter {
void (*init)(struct i2c_adapter *adap, int speed,
int slaveaddr);
@@ -65,6 +79,8 @@ struct i2c_adapter {
int (*write)(struct i2c_adapter *adap, uint8_t chip,
uint addr, int alen, uint8_t *buffer,
int len);
+ int (*slave_io)(struct i2c_adapter *adap,
+ struct i2c_transaction *trans);
uint (*set_bus_speed)(struct i2c_adapter *adap,
uint speed);
int speed;
@@ -81,12 +97,13 @@ struct i2c_adapter {
.probe = _probe, \
.read = _read, \
.write = _write, \
+ .slave_io = 0, \
.set_bus_speed = _set_speed, \
.speed = _speed, \
.slaveaddr = _slaveaddr, \
.init_done = 0, \
.hwadapnr = _hwadapnr, \
- .name = #_name \
+ .name = #_name, \
};
#define U_BOOT_I2C_ADAP_COMPLETE(_name, _init, _probe, _read, _write, \
@@ -450,4 +467,15 @@ int i2c_get_bus_num_fdt(int node);
* @return 0 if port was reset, -1 if not found
*/
int i2c_reset_port_fdt(const void *blob, int node);
+
+/**
+ * Perform I2C transaction with master device.
+ *
+ * @param trans I2C transaction object
+ * @return 0 if succeeded, -1 if not supported,
+ * 1 if not ready, 2 if operation timed out,
+ * 3 if not our packet, other - unknown error.
+ */
+int i2c_slave_io(struct i2c_transaction *trans);
+
#endif /* _I2C_H_ */
