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hw/i2c-ddc.c: Implement DDC I2C slave

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Implement an I2C slave which implements DDC and returns the
EDID data for an attached monitor.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Tested-by: Hyun Kwon <hyun.kwon@xilinx.com>
Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Message-id: 1465833014-21982-7-git-send-email-fred.konrad@greensocs.com

  - Rebased on the current master.
  - Modified for QOM.

Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Tested-By: Hyun Kwon <hyun.kwon@xilinx.com>
[PMM: actually wire up the vmstate to dc->vmsd]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2016-06-14 15:59:15 +01:00
parent e27ed1bdd3
commit 78c71af804
4 changed files with 348 additions and 0 deletions
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38
include/hw/i2c/i2c-ddc.h Normal file
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/* A simple I2C slave for returning monitor EDID data via DDC.
*
* Copyright (c) 2011 Linaro Limited
* Written by Peter Maydell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef I2C_DDC
#define I2C_DDC
/* A simple I2C slave which just returns the contents of its EDID blob. */
struct I2CDDCState {
/*< private >*/
I2CSlave i2c;
/*< public >*/
bool firstbyte;
uint8_t reg;
uint8_t edid_blob[128];
};
typedef struct I2CDDCState I2CDDCState;
#define TYPE_I2CDDC "i2c-ddc"
#define I2CDDC(obj) OBJECT_CHECK(I2CDDCState, (obj), TYPE_I2CDDC)
#endif /* !I2C_DDC */