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1/*2 * Copyright 2015 Red Hat Inc.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial busions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 * Authors: Ben Skeggs <bskeggs@redhat.com>23 */24#define nv04_i2c_bus(p) container_of((p), struct nv04_i2c_bus, base)25#include "bus.h"26 27#include <subdev/vga.h>28 29struct nv04_i2c_bus {30 struct nvkm_i2c_bus base;31 u8 drive;32 u8 sense;33};34 35static void36nv04_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)37{38 struct nv04_i2c_bus *bus = nv04_i2c_bus(base);39 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;40 u8 val = nvkm_rdvgac(device, 0, bus->drive);41 if (state) val |= 0x20;42 else val &= 0xdf;43 nvkm_wrvgac(device, 0, bus->drive, val | 0x01);44}45 46static void47nv04_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)48{49 struct nv04_i2c_bus *bus = nv04_i2c_bus(base);50 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;51 u8 val = nvkm_rdvgac(device, 0, bus->drive);52 if (state) val |= 0x10;53 else val &= 0xef;54 nvkm_wrvgac(device, 0, bus->drive, val | 0x01);55}56 57static int58nv04_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)59{60 struct nv04_i2c_bus *bus = nv04_i2c_bus(base);61 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;62 return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x04);63}64 65static int66nv04_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)67{68 struct nv04_i2c_bus *bus = nv04_i2c_bus(base);69 struct nvkm_device *device = bus->base.pad->i2c->subdev.device;70 return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x08);71}72 73static const struct nvkm_i2c_bus_func74nv04_i2c_bus_func = {75 .drive_scl = nv04_i2c_bus_drive_scl,76 .drive_sda = nv04_i2c_bus_drive_sda,77 .sense_scl = nv04_i2c_bus_sense_scl,78 .sense_sda = nv04_i2c_bus_sense_sda,79 .xfer = nvkm_i2c_bit_xfer,80};81 82int83nv04_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive, u8 sense,84 struct nvkm_i2c_bus **pbus)85{86 struct nv04_i2c_bus *bus;87 88 if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))89 return -ENOMEM;90 *pbus = &bus->base;91 92 nvkm_i2c_bus_ctor(&nv04_i2c_bus_func, pad, id, &bus->base);93 bus->drive = drive;94 bus->sense = sense;95 return 0;96}97