intel_extreme: change i2c_send_receive to a hook

common: i2c/ddc uses a 7-bit address for EDID.

Change-Id: Ic1bba2a23174c671bd7374104596c22433bd343a
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5171
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Adrien Destugues <[email protected]>

headers/private/graphics/common/i2c.h

@@ -35,17 +35,26 @@ typedef struct i2c_timing {
 } i2c_timing;
 
 
+struct i2c_bus;
+
 // set signals on bus
 typedef status_t (*i2c_set_signals)(void *cookie, int clock, int data);
 // read signals from bus
 typedef status_t (*i2c_get_signals)(void *cookie, int *clock, int *data);
+// send/receive from bus
+typedef status_t (*i2c_send_receive)(const struct i2c_bus *bus, uint32 slave_address,
+		const uint8 *writeBuffer, size_t writeLength, uint8 *readBuffer,
+		size_t readLength);
 
 // i2c bus definition
 typedef struct i2c_bus {
 	void *cookie;					// user-defined cookie
+	// low-level
 	i2c_timing timing;
 	i2c_set_signals set_signals;	// callback to set signals
 	i2c_get_signals get_signals;	// callback to detect signals
+	// high-level
+	i2c_send_receive send_receive;
 } i2c_bus;
 
 
@@ -54,7 +63,7 @@ extern "C" {
 #endif
 
 // send and receive data via i2c bus
-status_t i2c_send_receive(const i2c_bus *bus, int slave_address,
+status_t i2c_send_receive_callback(const i2c_bus *bus, uint32 slave_address,
 	const uint8 *writeBuffer, size_t writeLength, uint8 *readBuffer,
 	size_t readLength);
 

src/add-ons/accelerants/common/ddc.c

@@ -54,6 +54,19 @@ verify_checksum(const uint8 *data, size_t len)
 }
 
 
+static status_t
+call_send_receive(const i2c_bus *bus, int slave_address,
+	const uint8 *writeBuffer, size_t writeLength, uint8 *readBuffer,
+	size_t readLength)
+{
+	i2c_send_receive send_receive = bus->send_receive;
+	if (send_receive == NULL)
+		send_receive = i2c_send_receive_callback;
+	return send_receive(bus, slave_address, writeBuffer, writeLength, readBuffer,
+		readLength);
+}
+
+
 //!	Read ddc2 data from monitor
 static status_t
 ddc2_read(const i2c_bus *bus, int start, uint8 *buffer, size_t length)
@@ -66,7 +79,7 @@ ddc2_read(const i2c_bus *bus, int start, uint8 *buffer, size_t length)
 	writeBuffer[1] = (start >> 8) & 0xff;
 
 	for (i = 0; i < READ_RETRIES; ++i) {
-		status = i2c_send_receive(bus, 0xa0, writeBuffer,
+		status = call_send_receive(bus, 0x50, writeBuffer,
 			start < 0x100 ? 1 : 2, buffer, length);
 
 		if (status != B_OK)
@@ -135,6 +148,8 @@ ddc2_read_vdif(const i2c_bus *bus, int start,
 void
 ddc2_init_timing(i2c_bus *bus)
 {
+	bus->send_receive = NULL;
+
 	i2c_get100k_timing(&bus->timing);
 
 	// VESA standard

src/add-ons/accelerants/common/i2c.c

@@ -268,7 +268,7 @@ send_byte(const i2c_bus *bus, uint8 byte, bool acknowledge)
 
 //!	Send slave address, obeying 10-bit addresses and general call addresses
 static status_t
-send_slave_address(const i2c_bus *bus, int slaveAddress, bool isWrite)
+send_slave_address(const i2c_bus *bus, uint8 slaveAddress, bool isWrite)
 {
 	status_t status;
 
@@ -400,10 +400,17 @@ receive_bytes(const i2c_bus *bus, uint8 *readBuffer, ssize_t readLength)
 
 //!	Combined i2c send+receive format
 status_t
-i2c_send_receive(const i2c_bus *bus, int slaveAddress, const uint8 *writeBuffer,
+i2c_send_receive_callback(const i2c_bus *bus, uint32 slaveAddress, const uint8 *writeBuffer,
 	size_t writeLength, uint8 *readBuffer, size_t readLength)
 {
-	status_t status = send_start_condition(bus);
+	status_t status;
+
+	// the address is 7-bit
+	slaveAddress <<= 1;
+	if (slaveAddress > 0xff)
+		return B_BAD_VALUE;
+
+	status = send_start_condition(bus);
 	if (status != B_OK)
 		return status;
 

src/add-ons/accelerants/intel_extreme/Ports.cpp

@@ -208,20 +208,9 @@ Port::GetEDID(edid1_info* edid, bool forceRead)
 	if (fEDIDState == B_NO_INIT || forceRead) {
 		TRACE("%s: trying to read EDID\n", PortName());
 
-		addr_t ddcRegister = _DDCRegister();
-		if (ddcRegister == 0) {
-			TRACE("%s: no DDC register found\n", PortName());
-			fEDIDState = B_ERROR;
-			return fEDIDState;
-		}
-
-		TRACE("%s: using ddc @ 0x%" B_PRIxADDR "\n", PortName(), ddcRegister);
-
 		i2c_bus bus;
-		bus.cookie = (void*)ddcRegister;
-		bus.set_signals = &_SetI2CSignals;
-		bus.get_signals = &_GetI2CSignals;
-		ddc2_init_timing(&bus);
+		if (SetupI2c(&bus) != B_OK)
+			return fEDIDState;
 
 		fEDIDState = ddc2_read_edid1(&bus, &fEDIDInfo, NULL, NULL);
 
@@ -243,6 +232,27 @@ Port::GetEDID(edid1_info* edid, bool forceRead)
 }
 
 
+status_t
+Port::SetupI2c(i2c_bus *bus)
+{
+	addr_t ddcRegister = _DDCRegister();
+	if (ddcRegister == 0) {
+		TRACE("%s: no DDC register found\n", PortName());
+		fEDIDState = B_ERROR;
+		return fEDIDState;
+	}
+
+	TRACE("%s: using ddc @ 0x%" B_PRIxADDR "\n", PortName(), ddcRegister);
+
+	ddc2_init_timing(bus);
+	bus->cookie = (void*)ddcRegister;
+	bus->set_signals = &_SetI2CSignals;
+	bus->get_signals = &_GetI2CSignals;
+
+	return B_OK;
+}
+
+
 status_t
 Port::GetPLLLimits(pll_limits& limits)
 {

src/add-ons/accelerants/intel_extreme/Ports.h

@@ -21,6 +21,7 @@
 #define MAX_PORTS	20	// a generous upper bound
 
 struct pll_limits;
+struct i2c_bus;
 
 enum port_type {
 	INTEL_PORT_TYPE_ANY,		// wildcard for lookup functions
@@ -57,6 +58,7 @@ virtual	status_t					Power(bool enabled);
 		bool						HasEDID();
 virtual	status_t					GetEDID(edid1_info* edid,
 										bool forceRead = false);
+virtual	status_t					SetupI2c(struct i2c_bus *bus);
 
 virtual	status_t					GetPLLLimits(pll_limits& limits);