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kernel add
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/*
* 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;
}
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