Add enough of airlied's DDC/I2C work to pull EDID info from my CRT.

1 files changed, 286 insertions, 0 deletions

diff --git a/src/i830_i2c.c b/src/i830_i2c.c
new file mode 100644
index 00000000..8c80a0a1
--- /dev/null
+++ b/src/i830_i2c.c
@@ -0,0 +1,286 @@
+/**************************************************************************
+
+ Copyright 2006 Dave Airlie <airlied@linux.ie>
+ 
+All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+on the rights to use, copy, modify, merge, publish, distribute, sub
+license, and/or sell copies of the Software, and to permit persons to whom
+the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+**************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "xf86.h"
+#include "xf86_ansic.h"
+#include "xf86_OSproc.h"
+#include "xf86Resources.h"
+#include "xf86RAC.h"
+#include "xf86cmap.h"
+#include "compiler.h"
+#include "mibstore.h"
+#include "vgaHW.h"
+#include "mipointer.h"
+#include "micmap.h"
+#include "shadowfb.h"
+#include <X11/extensions/randr.h>
+#include "fb.h"
+#include "miscstruct.h"
+#include "xf86xv.h"
+#include <X11/extensions/Xv.h>
+#include "shadow.h"
+#include "i830.h"
+
+#define I2C_TIMEOUT(x)	/*(x)*/  /* Report timeouts */
+#define I2C_TRACE(x)    /*(x)*/  /* Report progress */
+
+static void i830_setscl(I2CBusPtr b, int state)
+{
+    ScrnInfoPtr    pScrn      = xf86Screens[b->scrnIndex];
+    I830Ptr pI830 = I830PTR(pScrn);
+    CARD32 val;
+
+    OUTREG(b->DriverPrivate.uval,
+	(state ? GPIO_CLOCK_VAL_OUT : 0) |
+	GPIO_CLOCK_DIR |
+	GPIO_CLOCK_DIR_MASK |
+	GPIO_CLOCK_VAL_MASK);
+    val = INREG(b->DriverPrivate.uval);
+}
+
+static void i830_setsda(I2CBusPtr b, int state)
+{
+    ScrnInfoPtr    pScrn      = xf86Screens[b->scrnIndex];
+    I830Ptr pI830 = I830PTR(pScrn);
+    CARD32 val;
+
+    OUTREG(b->DriverPrivate.uval, (state ? GPIO_DATA_VAL_OUT : 0) |
+	GPIO_DATA_DIR |
+	GPIO_DATA_DIR_MASK |
+	GPIO_DATA_VAL_MASK);
+    val = INREG(b->DriverPrivate.uval);
+}
+
+static void i830_getscl(I2CBusPtr b, int *state)
+{
+    ScrnInfoPtr    pScrn      = xf86Screens[b->scrnIndex];
+    I830Ptr pI830 = I830PTR(pScrn);
+    CARD32 val;
+
+    OUTREG(b->DriverPrivate.uval, GPIO_CLOCK_DIR_MASK);
+    OUTREG(b->DriverPrivate.uval, 0);
+    val = INREG(b->DriverPrivate.uval);
+    *state = ((val & GPIO_CLOCK_VAL_IN) != 0);
+}
+
+static int i830_getsda(I2CBusPtr b)
+{
+    ScrnInfoPtr    pScrn      = xf86Screens[b->scrnIndex];
+    I830Ptr pI830 = I830PTR(pScrn);
+    CARD32 val;
+
+    OUTREG(b->DriverPrivate.uval, GPIO_DATA_DIR_MASK);
+    OUTREG(b->DriverPrivate.uval, 0);
+    val = INREG(b->DriverPrivate.uval);
+    return ((val & GPIO_DATA_VAL_IN) != 0);
+}
+
+static inline void sdalo(I2CBusPtr b)
+{
+    i830_setsda(b, 0);
+    b->I2CUDelay(b, b->RiseFallTime);
+}
+
+static inline void sdahi(I2CBusPtr b)
+{
+    i830_setsda(b, 1);
+    b->I2CUDelay(b, b->RiseFallTime);
+}
+
+static inline void scllo(I2CBusPtr b)
+{
+    i830_setscl(b, 0);
+    b->I2CUDelay(b, b->RiseFallTime);
+}
+
+static inline int sclhi(I2CBusPtr b, int timeout)
+{
+    int scl = 0;
+    int i;
+
+    i830_setscl(b, 1);
+    b->I2CUDelay(b, b->RiseFallTime);
+  
+    for (i = timeout; i > 0; i -= b->RiseFallTime) {
+	i830_getscl(b, &scl);
+	if (scl) break;
+	b->I2CUDelay(b, b->RiseFallTime);
+    }
+
+    if (i <= 0) {
+	I2C_TIMEOUT(ErrorF("[I2CRaiseSCL(<%s>, %d) timeout]", b->BusName, timeout));    
+	return FALSE;
+    }
+    return TRUE;
+}
+
+static Bool
+I830I2CGetByte(I2CDevPtr d, I2CByte *data, Bool last)
+{
+    I2CBusPtr b = d->pI2CBus;
+    int i;
+    unsigned char indata = 0;
+
+    sdahi(b);
+
+    for (i = 0; i < 8; i++) {
+      if (sclhi(b, d->BitTimeout)==FALSE) {
+	I2C_TRACE(ErrorF("timeout at bit #%d\n", 7-i));
+	return FALSE;
+      }
+      indata*=2;
+      if ( i830_getsda (b) ) {
+	indata |= 0x01;
+      }
+      scllo(b);
+    }
+
+    if (last)
+      sdahi(b);
+    else
+      sdalo(b);
+
+    if (sclhi(b, d->BitTimeout) == FALSE) {
+      sdahi(b);
+      return FALSE;
+    }
+
+    scllo(b);
+    sdahi(b);
+
+    *data = indata & 0xff;
+    I2C_TRACE(ErrorF("R%02x ", (int) *data));
+    
+    return TRUE;
+}
+
+static Bool
+I830I2CPutByte(I2CDevPtr d, I2CByte c)
+{
+    int i;
+    int sb, ack;
+    I2CBusPtr b = d->pI2CBus;
+
+    for (i = 7; i>=0; i--) {
+      sb = c & (1 << i);
+      i830_setsda(b, sb);
+      b->I2CUDelay(b, b->RiseFallTime);
+
+      if (sclhi(b, d->ByteTimeout) == FALSE) {
+	sdahi(b);
+	return FALSE;
+      }
+
+      i830_setscl(b, 0);
+      b->I2CUDelay(b, b->RiseFallTime);
+    }
+    sdahi(b);
+    if (sclhi(b, d->ByteTimeout) == FALSE) {
+      I2C_TIMEOUT(ErrorF("[I2CPutByte(<%s>, 0x%02x, %d, %d, %d) timeout]", 
+			 b->BusName, c, d->BitTimeout, 
+			 d->ByteTimeout, d->AcknTimeout));
+      return FALSE;
+    }
+    ack = i830_getsda(b);
+    I2C_TRACE(ErrorF("Put byte 0x%02x , getsda() = %d\n", c & 0xff, ack));
+
+    scllo(b);
+    return 0 == ack;
+}
+
+static Bool
+I830I2CStart(I2CBusPtr b, int timeout)
+{
+    if (sclhi(b, timeout) == FALSE)
+	return FALSE;
+
+    sdalo(b);
+    scllo(b);
+    
+    return TRUE;
+}
+
+static void
+I830I2CStop(I2CDevPtr d)
+{
+    I2CBusPtr b = d->pI2CBus;
+
+    sdalo(b);
+    sclhi(b, d->ByteTimeout);
+    sdahi(b);
+}
+
+static Bool
+I830I2CAddress(I2CDevPtr d, I2CSlaveAddr addr)
+{
+    if (I830I2CStart(d->pI2CBus, d->StartTimeout)) {
+	if (I830I2CPutByte(d, addr & 0xFF)) {
+	    if ((addr & 0xF8) != 0xF0 &&
+		(addr & 0xFE) != 0x00)
+		return TRUE;
+
+	    if (I830I2CPutByte(d, (addr >> 8) & 0xFF))
+		return TRUE;
+	}
+
+	I830I2CStop(d);
+    }
+
+    return FALSE;
+}
+
+
+/* the i830 has a number of I2C Buses */
+Bool
+I830I2CInit(ScrnInfoPtr pScrn, I2CBusPtr *bus_ptr, int i2c_reg, char *name)
+{
+    I2CBusPtr pI2CBus;
+
+    pI2CBus = xf86CreateI2CBusRec();
+
+    if (!pI2CBus)
+	return FALSE;
+
+    pI2CBus->BusName = name;
+    pI2CBus->scrnIndex = pScrn->scrnIndex;
+    pI2CBus->I2CGetByte = I830I2CGetByte;
+    pI2CBus->I2CPutByte = I830I2CPutByte;
+    pI2CBus->I2CStart = I830I2CStart;
+    pI2CBus->I2CStop = I830I2CStop;
+    pI2CBus->I2CAddress = I830I2CAddress;
+    pI2CBus->DriverPrivate.uval = i2c_reg;
+
+    if (!xf86I2CBusInit(pI2CBus))
+	return FALSE;
+
+    *bus_ptr = pI2CBus;
+    return TRUE;
+}