[PATCH v4 14/15] hw/i2c: Extract i2c_do_start_transfer() from i2c_start_transfer()

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

To allow further simplications, extract i2c_do_start_transfer()
from i2c_start_transfer(). This is mostly the same function,
but the former is static and takes an enum argument.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/i2c/core.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/hw/i2c/core.c b/hw/i2c/core.c
index 6639ca8c2e0..69df4c0df6b 100644
--- a/hw/i2c/core.c
+++ b/hw/i2c/core.c
@@ -115,12 +115,15 @@ bool i2c_scan_bus(I2CBus *bus, uint8_t address, bool broadcast,
  * without releasing the bus.  If that fails, the bus is still
  * in a transaction.
  */
-int i2c_start_transfer(I2CBus *bus, uint8_t address, bool is_recv)
+static int i2c_do_start_transfer(I2CBus *bus, uint8_t address,
+                                 enum i2c_event event)
 {
     I2CSlaveClass *sc;
     I2CNode *node;
     bool bus_scanned = false;
 
+    assert(event == I2C_START_RECV || event == I2C_START_SEND);
+
     if (address == I2C_BROADCAST) {
         /*
          * This is a broadcast, the current_devs will be all the devices of the
@@ -157,7 +160,7 @@ int i2c_start_transfer(I2CBus *bus, uint8_t address, bool is_recv)
 
         if (sc->event) {
             trace_i2c_event("start", s->address);
-            rv = sc->event(s, is_recv ? I2C_START_RECV : I2C_START_SEND);
+            rv = sc->event(s, event);
             if (rv && !bus->broadcast) {
                 if (bus_scanned) {
                     /* First call, terminate the transfer. */
@@ -170,6 +173,13 @@ int i2c_start_transfer(I2CBus *bus, uint8_t address, bool is_recv)
     return 0;
 }
 
+int i2c_start_transfer(I2CBus *bus, uint8_t address, bool is_recv)
+{
+    return i2c_do_start_transfer(bus, address, is_recv
+                                               ? I2C_START_RECV
+                                               : I2C_START_SEND);
+}
+
 void i2c_end_transfer(I2CBus *bus)
 {
     I2CSlaveClass *sc;
-- 
2.31.1