97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
|
/*
|
||
|
|
* Copyright 2015 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, sublicense,
|
||
|
|
* 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 shall be included in
|
||
|
|
* all copies or substantial busions 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 NONINFRINGEMENT. IN NO EVENT SHALL
|
||
|
|
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
|
||
|
|
*
|
||
|
|
* Authors: Ben Skeggs <bskeggs@redhat.com>
|
||
|
|
*/
|
||
|
|
#define nv04_i2c_bus(p) container_of((p), struct nv04_i2c_bus, base)
|
||
|
|
#include "bus.h"
|
||
|
|
|
||
|
|
#include <subdev/vga.h>
|
||
|
|
|
||
|
|
struct nv04_i2c_bus {
|
||
|
|
struct nvkm_i2c_bus base;
|
||
|
|
u8 drive;
|
||
|
|
u8 sense;
|
||
|
|
};
|
||
|
|
|
||
|
|
static void
|
||
|
|
nv04_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
|
||
|
|
{
|
||
|
|
struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
|
||
|
|
struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
|
||
|
|
u8 val = nvkm_rdvgac(device, 0, bus->drive);
|
||
|
|
if (state) val |= 0x20;
|
||
|
|
else val &= 0xdf;
|
||
|
|
nvkm_wrvgac(device, 0, bus->drive, val | 0x01);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
nv04_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
|
||
|
|
{
|
||
|
|
struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
|
||
|
|
struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
|
||
|
|
u8 val = nvkm_rdvgac(device, 0, bus->drive);
|
||
|
|
if (state) val |= 0x10;
|
||
|
|
else val &= 0xef;
|
||
|
|
nvkm_wrvgac(device, 0, bus->drive, val | 0x01);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
nv04_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
|
||
|
|
{
|
||
|
|
struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
|
||
|
|
struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
|
||
|
|
return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x04);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
nv04_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
|
||
|
|
{
|
||
|
|
struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
|
||
|
|
struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
|
||
|
|
return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x08);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct nvkm_i2c_bus_func
|
||
|
|
nv04_i2c_bus_func = {
|
||
|
|
.drive_scl = nv04_i2c_bus_drive_scl,
|
||
|
|
.drive_sda = nv04_i2c_bus_drive_sda,
|
||
|
|
.sense_scl = nv04_i2c_bus_sense_scl,
|
||
|
|
.sense_sda = nv04_i2c_bus_sense_sda,
|
||
|
|
.xfer = nvkm_i2c_bit_xfer,
|
||
|
|
};
|
||
|
|
|
||
|
|
int
|
||
|
|
nv04_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive, u8 sense,
|
||
|
|
struct nvkm_i2c_bus **pbus)
|
||
|
|
{
|
||
|
|
struct nv04_i2c_bus *bus;
|
||
|
|
|
||
|
|
if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
|
||
|
|
return -ENOMEM;
|
||
|
|
*pbus = &bus->base;
|
||
|
|
|
||
|
|
nvkm_i2c_bus_ctor(&nv04_i2c_bus_func, pad, id, &bus->base);
|
||
|
|
bus->drive = drive;
|
||
|
|
bus->sense = sense;
|
||
|
|
return 0;
|
||
|
|
}
|