tda19988: driver for the TDA19988 HDMI Transmitter
Change-Id: Ia7750df3dd4ec4bd68624c800a0241c70eea7ca4
This commit is contained in:
Thomas Cort
parent
437177b028
commit
1b78e86fb8
7 changed files with 1191 additions and 2 deletions
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@ -109,5 +109,6 @@
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./usr/sbin/gpio minix-sys
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./usr/sbin/i2c minix-sys
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./usr/sbin/random minix-sys
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./usr/sbin/tda19988 minix-sys
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./usr/tests/minix-posix/mod minix-sys
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./usr/tests/minix-posix/test63 minix-sys
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@ -23,7 +23,7 @@ SUBDIR= ahci amddev atl2 at_wini audio dec21140A dp8390 dpeth \
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.endif
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.if ${MACHINE_ARCH} == "earm"
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SUBDIR= cat24c256 fb gpio i2c mmc log tty random
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SUBDIR= cat24c256 fb gpio i2c mmc log tda19988 tty random
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.endif
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.endif # ${MKIMAGEONLY} != "yes"
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14
drivers/tda19988/Makefile
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14
drivers/tda19988/Makefile
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@ -0,0 +1,14 @@
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# Makefile for the tda19988 HDMI framer found on the BeagleBone Black.
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PROG= tda19988
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SRCS= tda19988.c
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DPADD+= ${LIBI2CDRIVER} ${LIBBLOCKDRIVER} ${LIBSYS} ${LIBTIMERS}
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LDADD+= -li2cdriver -lblockdriver -lsys -ltimers
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MAN=
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BINDIR?= /usr/sbin
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CPPFLAGS+= -I${NETBSDSRCDIR}
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.include <minix.service.mk>
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79
drivers/tda19988/README.txt
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79
drivers/tda19988/README.txt
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@ -0,0 +1,79 @@
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TDA19988 Driver (HDMI Framer)
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=============================
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Overview
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--------
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This is the driver for the HDMI Framer chip commonly found on the BeagleBone
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Black.
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Interface
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---------
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To make things easy for the frame buffer driver, a block device driver
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interface is provided. Read requests cause the TDA19988 driver to read
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the EDID and return the data.
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Documentation
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-------------
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The documentation available is rather thin. NXP doesn't provide a
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datasheet on their website and they did not respond to my request
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for a datasheet. There are a few other sources of information:
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* TDA9983B.pdf - this chip is similar but not the same. Full
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register descriptions are provided. This was suggested to me by
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the author of the Linux driver and someone at BeagleBoard.org as
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neither of them were able to get a full datasheet for the TDA19988.
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* TDA19988.pdf - you can probably find this on the net. It's a
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pre-production draft of the datasheet for the TDA19988. It has
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some information about how things work, but it doesn't give details
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on the registers.
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* LPC4350_FPU_TFT_HDMI-v2.0/Driver/tda19988.c - there's some
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example code from NXP for a Hitex LPC4350 REV A5 which includes
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a BSD licensed driver from NXP. It isn't complete as it only does
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test mode, put-through mode, and EDID reading. Some of the comments
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in the code make it seem like it isn't totally working/tested.
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* linux/drivers/gpu/drm/i2c/tda998x_drv.c - there is a Linux driver
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which implements a lot of functionality. As is always the case,
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great care has to be taken to only study the code to learn the
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functionality of the chip and not reproduce/copy the code.
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Limitations
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-----------
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Currently, only the EDID reading functionality is implemented.
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Testing the Code
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----------------
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Starting up an instance:
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/bin/service up /usr/sbin/tda19988 -label tda19988.1.3470 \
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-args 'cec_bus=1 cec_address=0x34 hdmi_bus=1 hdmi_address=0x70'
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Killing an instance:
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/bin/service down tda19988.1.3470
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The driver is meant to be accessed from other drivers using the block
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device protocol, so it doesn't have a reserved major number and device file.
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However, if you want a simple test from user space, you can create a temporary
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device file to read the EDID like this:
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cd /dev
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mknod tda19988 b 32 0
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chmod 600 tda19988
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/bin/service up /usr/sbin/tda19988 -label tda19988.1.3470 \
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-dev /dev/tda19988 \
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-args 'cec_bus=1 cec_address=0x34 hdmi_bus=1 hdmi_address=0x70'
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dd if=/dev/tda19988 of=/root/edid.dat count=1 bs=128
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/bin/service down tda19988.1.3470
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hexdump -C /root/edid.dat
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rm tda19988
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The hexdump should begin with the EDID magic number: 00 ff ff ff ff ff ff 00
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1086
drivers/tda19988/tda19988.c
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1086
drivers/tda19988/tda19988.c
Normal file
File diff suppressed because it is too large
Load diff
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@ -568,7 +568,7 @@ service fb
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PRIVCTL # 4
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;
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ipc
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SYSTEM pm rs ds vm vfs
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SYSTEM pm rs ds vm vfs tda19988
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;
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};
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@ -613,6 +613,11 @@ service cat24c256
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ipc SYSTEM RS DS i2c;
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};
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service tda19988
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{
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ipc SYSTEM RS DS i2c;
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};
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service vbox
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{
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system
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@ -210,6 +210,10 @@ start)
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test -e /dev/eepromb1s50 || (cd /dev && MAKEDEV eepromb1s50)
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up cat24c256 -dev /dev/eepromb1s50 \
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-label cat24c256.1.50 -args 'bus=1 address=0x50'
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# Start TDA19988 driver for EDID reading.
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up tda19988 -label tda19988.1.3470 -args \
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'cec_bus=1 cec_address=0x34 hdmi_bus=1 hdmi_address=0x70'
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;;
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UNKNOWN)
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echo "Unable to detect board -- assuming BeagleBoard-xM"
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