131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/*
|
|
* Copyright 2012 Red Hat Inc.
|
|
*
|
|
* 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 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 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, AUTHORS AND/OR ITS 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.
|
|
*
|
|
* The above copyright notice and this permission notice (including the
|
|
* next paragraph) shall be included in all copies or substantial portions
|
|
* of the Software.
|
|
*
|
|
*/
|
|
/*
|
|
* Authors: Dave Airlie <airlied@redhat.com>
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/i2c-algo-bit.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/pci.h>
|
|
|
|
#include "mgag200_drv.h"
|
|
|
|
static int mga_i2c_read_gpio(struct mga_device *mdev)
|
|
{
|
|
WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
|
|
return RREG8(DAC_DATA);
|
|
}
|
|
|
|
static void mga_i2c_set_gpio(struct mga_device *mdev, int mask, int val)
|
|
{
|
|
int tmp;
|
|
|
|
WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL);
|
|
tmp = (RREG8(DAC_DATA) & mask) | val;
|
|
WREG_DAC(MGA1064_GEN_IO_CTL, tmp);
|
|
WREG_DAC(MGA1064_GEN_IO_DATA, 0);
|
|
}
|
|
|
|
static inline void mga_i2c_set(struct mga_device *mdev, int mask, int state)
|
|
{
|
|
if (state)
|
|
state = 0;
|
|
else
|
|
state = mask;
|
|
mga_i2c_set_gpio(mdev, ~mask, state);
|
|
}
|
|
|
|
static void mga_gpio_setsda(void *data, int state)
|
|
{
|
|
struct mga_i2c_chan *i2c = data;
|
|
struct mga_device *mdev = to_mga_device(i2c->dev);
|
|
mga_i2c_set(mdev, i2c->data, state);
|
|
}
|
|
|
|
static void mga_gpio_setscl(void *data, int state)
|
|
{
|
|
struct mga_i2c_chan *i2c = data;
|
|
struct mga_device *mdev = to_mga_device(i2c->dev);
|
|
mga_i2c_set(mdev, i2c->clock, state);
|
|
}
|
|
|
|
static int mga_gpio_getsda(void *data)
|
|
{
|
|
struct mga_i2c_chan *i2c = data;
|
|
struct mga_device *mdev = to_mga_device(i2c->dev);
|
|
return (mga_i2c_read_gpio(mdev) & i2c->data) ? 1 : 0;
|
|
}
|
|
|
|
static int mga_gpio_getscl(void *data)
|
|
{
|
|
struct mga_i2c_chan *i2c = data;
|
|
struct mga_device *mdev = to_mga_device(i2c->dev);
|
|
return (mga_i2c_read_gpio(mdev) & i2c->clock) ? 1 : 0;
|
|
}
|
|
|
|
static void mgag200_i2c_release(void *res)
|
|
{
|
|
struct mga_i2c_chan *i2c = res;
|
|
|
|
i2c_del_adapter(&i2c->adapter);
|
|
}
|
|
|
|
int mgag200_i2c_init(struct mga_device *mdev, struct mga_i2c_chan *i2c)
|
|
{
|
|
struct drm_device *dev = &mdev->base;
|
|
const struct mgag200_device_info *info = mdev->info;
|
|
int ret;
|
|
|
|
WREG_DAC(MGA1064_GEN_IO_CTL2, 1);
|
|
WREG_DAC(MGA1064_GEN_IO_DATA, 0xff);
|
|
WREG_DAC(MGA1064_GEN_IO_CTL, 0);
|
|
|
|
i2c->data = BIT(info->i2c.data_bit);
|
|
i2c->clock = BIT(info->i2c.clock_bit);
|
|
i2c->adapter.owner = THIS_MODULE;
|
|
i2c->adapter.class = I2C_CLASS_DDC;
|
|
i2c->adapter.dev.parent = dev->dev;
|
|
i2c->dev = dev;
|
|
i2c_set_adapdata(&i2c->adapter, i2c);
|
|
snprintf(i2c->adapter.name, sizeof(i2c->adapter.name), "mga i2c");
|
|
|
|
i2c->adapter.algo_data = &i2c->bit;
|
|
|
|
i2c->bit.udelay = 10;
|
|
i2c->bit.timeout = 2;
|
|
i2c->bit.data = i2c;
|
|
i2c->bit.setsda = mga_gpio_setsda;
|
|
i2c->bit.setscl = mga_gpio_setscl;
|
|
i2c->bit.getsda = mga_gpio_getsda;
|
|
i2c->bit.getscl = mga_gpio_getscl;
|
|
|
|
ret = i2c_bit_add_bus(&i2c->adapter);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return devm_add_action_or_reset(dev->dev, mgag200_i2c_release, i2c);
|
|
}
|