diff options
Diffstat (limited to 'xorg-server/hw/xfree86/ddc')
| -rw-r--r-- | xorg-server/hw/xfree86/ddc/DDC.HOWTO | 194 | ||||
| -rw-r--r-- | xorg-server/hw/xfree86/ddc/Makefile.am | 22 |
2 files changed, 108 insertions, 108 deletions
diff --git a/xorg-server/hw/xfree86/ddc/DDC.HOWTO b/xorg-server/hw/xfree86/ddc/DDC.HOWTO index 54fbe73ad..1d06ca124 100644 --- a/xorg-server/hw/xfree86/ddc/DDC.HOWTO +++ b/xorg-server/hw/xfree86/ddc/DDC.HOWTO @@ -1,97 +1,97 @@ - DDC.HOWTO
-
- This file describes how to add DDC support to a chipset driver.
-
-1) DDC INITIALIZATION
-
- When implementing DDC in the driver one has the choice between
- DDC1 and DDC2.
- DDC1 data is continuously transmitted by a DDC1 capable display
- device. The data is send serially over a data line; the Vsync
- signal serves as clock. Only one EDID 1.x data block can be
- transmitted using DDC1. Since transmission of an EDID1 block
- using a regular Vsync frequency would take up several seconds
- the driver can increase the Vsync frequency to up to 25 kHz as
- soon as it detects DDC1 activity on the data line.
- DDC2 data is transmitted using the I2C protocol. This requires
- an additional clock line. DDC2 is capable of transmitting EDID1
- and EDID2 block as well as a VDIF block on display devices that
- support these.
- Display devices switch into the DDC2 mode as soon as they detect
- activity on the DDC clock line. Once the are in DDC2 mode they
- stop transmitting DDC1 signals until the next power cycle.
-
- Some graphics chipset configurations which are not capable of
- DDC2 might still be able to read DDC1 data. Where available
- DDC2 it is preferable.
-
- All relevant prototypes and defines are in xf86DDC.h.
- DDC2 additionally requires I2C support. The I2C prototypes
- are in xf86i2c.h.
-
- DDC1 Support:
-
- The driver has to provide a read function which waits for the
- end of the next Vsync signal and reads in and returns the status
- of the DDC line:
-
- unsigned int XXX_ddc1Read(ScrnInfoPtr pScrn)
-
- Additionally a function is required to increase the Vsync
- frequency to max. 25 kHz.
-
- void XXX_ddc1SetSpeed(ScrnInfoPtr pScrn, xf86ddcSpeed speed)
-
- If the speed argument is DDC_FAST the function should increase
- the Vsync frequency on DDC_SLOW it should restore the original
- value. For convenience a generic ddc1SetSpeed() function is provided
- in the vga module for VGA-like chipsets.
-
- void vgaHWddc1SetSpeed(ScrnInfoPtr pScrn, sf86ddcSpeed speed).
-
- To read out the DDC1 data the driver should call
-
- xf86MonPtr xf86DoEDID_DDC1(int scrnIndex,
- void (*DDC1SetSpeed)(ScrnInfoPtr, xf86ddcSpeed),
- unsigned int (*DDC1Read)(ScrnInfoPtr))
-
- in PreInit(). DDC1SetSpeed is a pointer to the SetSpeed()
- function, DDC1Read has to point to the DDC1 read function.
- The function will return a pointer to the xf86Monitor structure
- which contains all information retrieved by DDC.
- NULL will be returned on failure.
-
- DDC2 Support
-
- To read out DDC2 information I2C has to be initialized first.
- (See documentation for the i2c module).
- The function
-
- xf86MonPtr xf86DoEDID_DDC2(int scrnIndex, I2CBusPtr pBus)
-
- is provided to read out and process DDC2 data. A pointer
- to the I2CBusRec of the appropriate I2C Bus has to be passed
- as the second argument.
- The function will return a pointer to the xf86Monitor structure
- which contains all information retrieved by DDC.
- NULL will be returned on failure.
-
- Printing monitor parameters
-
- To print out the information contained in the xf86Monitor
- structure the function
-
- xf86MonPtr xf86PrintEDID(xf86MonPtr monitor)
-
- is provided.
-
- Further processing of the xf86Monitor structure is not yet
- implemented. However, it is planned to use the information
- about video modes, gamma values etc.
- Therefore it is strongly recommended to read out DDC data
- before any video mode processing is done.
-
-
-
-
-$XFree86: xc/programs/Xserver/hw/xfree86/ddc/DDC.HOWTO,v 1.2 1998/12/06 13:30:39 dawes Exp $
+ DDC.HOWTO + + This file describes how to add DDC support to a chipset driver. + +1) DDC INITIALIZATION + + When implementing DDC in the driver one has the choice between + DDC1 and DDC2. + DDC1 data is continuously transmitted by a DDC1 capable display + device. The data is send serially over a data line; the Vsync + signal serves as clock. Only one EDID 1.x data block can be + transmitted using DDC1. Since transmission of an EDID1 block + using a regular Vsync frequency would take up several seconds + the driver can increase the Vsync frequency to up to 25 kHz as + soon as it detects DDC1 activity on the data line. + DDC2 data is transmitted using the I2C protocol. This requires + an additional clock line. DDC2 is capable of transmitting EDID1 + and EDID2 block as well as a VDIF block on display devices that + support these. + Display devices switch into the DDC2 mode as soon as they detect + activity on the DDC clock line. Once the are in DDC2 mode they + stop transmitting DDC1 signals until the next power cycle. + + Some graphics chipset configurations which are not capable of + DDC2 might still be able to read DDC1 data. Where available + DDC2 it is preferable. + + All relevant prototypes and defines are in xf86DDC.h. + DDC2 additionally requires I2C support. The I2C prototypes + are in xf86i2c.h. + + DDC1 Support: + + The driver has to provide a read function which waits for the + end of the next Vsync signal and reads in and returns the status + of the DDC line: + + unsigned int XXX_ddc1Read(ScrnInfoPtr pScrn) + + Additionally a function is required to increase the Vsync + frequency to max. 25 kHz. + + void XXX_ddc1SetSpeed(ScrnInfoPtr pScrn, xf86ddcSpeed speed) + + If the speed argument is DDC_FAST the function should increase + the Vsync frequency on DDC_SLOW it should restore the original + value. For convenience a generic ddc1SetSpeed() function is provided + in the vga module for VGA-like chipsets. + + void vgaHWddc1SetSpeed(ScrnInfoPtr pScrn, sf86ddcSpeed speed). + + To read out the DDC1 data the driver should call + + xf86MonPtr xf86DoEDID_DDC1(int scrnIndex, + void (*DDC1SetSpeed)(ScrnInfoPtr, xf86ddcSpeed), + unsigned int (*DDC1Read)(ScrnInfoPtr)) + + in PreInit(). DDC1SetSpeed is a pointer to the SetSpeed() + function, DDC1Read has to point to the DDC1 read function. + The function will return a pointer to the xf86Monitor structure + which contains all information retrieved by DDC. + NULL will be returned on failure. + + DDC2 Support + + To read out DDC2 information I2C has to be initialized first. + (See documentation for the i2c module). + The function + + xf86MonPtr xf86DoEDID_DDC2(int scrnIndex, I2CBusPtr pBus) + + is provided to read out and process DDC2 data. A pointer + to the I2CBusRec of the appropriate I2C Bus has to be passed + as the second argument. + The function will return a pointer to the xf86Monitor structure + which contains all information retrieved by DDC. + NULL will be returned on failure. + + Printing monitor parameters + + To print out the information contained in the xf86Monitor + structure the function + + xf86MonPtr xf86PrintEDID(xf86MonPtr monitor) + + is provided. + + Further processing of the xf86Monitor structure is not yet + implemented. However, it is planned to use the information + about video modes, gamma values etc. + Therefore it is strongly recommended to read out DDC data + before any video mode processing is done. + + + + +$XFree86: xc/programs/Xserver/hw/xfree86/ddc/DDC.HOWTO,v 1.2 1998/12/06 13:30:39 dawes Exp $ diff --git a/xorg-server/hw/xfree86/ddc/Makefile.am b/xorg-server/hw/xfree86/ddc/Makefile.am index 0db5d833f..93ea4a2a5 100644 --- a/xorg-server/hw/xfree86/ddc/Makefile.am +++ b/xorg-server/hw/xfree86/ddc/Makefile.am @@ -1,11 +1,11 @@ -sdk_HEADERS = edid.h xf86DDC.h
-
-noinst_LTLIBRARIES = libddc.la
-
-libddc_la_SOURCES = ddc.c interpret_edid.c print_edid.c ddcProperty.c
-
-INCLUDES = $(XORG_INCS) -I$(srcdir)/../i2c
-
-AM_CFLAGS = $(DIX_CFLAGS) $(XORG_CFLAGS)
-
-EXTRA_DIST = DDC.HOWTO
+sdk_HEADERS = edid.h xf86DDC.h + +noinst_LTLIBRARIES = libddc.la + +libddc_la_SOURCES = ddc.c interpret_edid.c print_edid.c ddcProperty.c + +INCLUDES = $(XORG_INCS) -I$(srcdir)/../i2c + +AM_CFLAGS = $(DIX_CFLAGS) $(XORG_CFLAGS) + +EXTRA_DIST = DDC.HOWTO |