1/*
2 * Copyright 2015 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial busions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * 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 OR
20 * 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 void
36nv04_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 void
47nv04_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 int
58nv04_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 int
66nv04_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_func
74nv04_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
82int
83nv04_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