1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*-
* Copyright (c) 2012 Justin Hibbits
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <machine/bus.h>
#include <dev/ofw/openfirm.h>
#include <dev/pci/pcivar.h>
#define PCI_VENDOR_ID_NVIDIA 0x10de
#define NVIDIA_BRIGHT_MIN (0x0ec)
#define NVIDIA_BRIGHT_MAX (0x538)
#define NVIDIA_BRIGHT_SCALE ((NVIDIA_BRIGHT_MAX - NVIDIA_BRIGHT_MIN)/100)
/* nVidia's MMIO registers are at PCI BAR[0] */
#define NVIDIA_MMIO_PMC (0x0)
#define NVIDIA_PMC_OFF (NVIDIA_MMIO_PMC + 0x10f0)
#define NVIDIA_PMC_BL_SHIFT (16)
#define NVIDIA_PMC_BL_EN (1U << 31)
struct nvbl_softc {
device_t dev;
struct resource *sc_memr;
};
static void nvbl_identify(driver_t *driver, device_t parent);
static int nvbl_probe(device_t dev);
static int nvbl_attach(device_t dev);
static int nvbl_setlevel(struct nvbl_softc *sc, int newlevel);
static int nvbl_getlevel(struct nvbl_softc *sc);
static int nvbl_sysctl(SYSCTL_HANDLER_ARGS);
static device_method_t nvbl_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, nvbl_identify),
DEVMETHOD(device_probe, nvbl_probe),
DEVMETHOD(device_attach, nvbl_attach),
{0, 0},
};
static driver_t nvbl_driver = {
"backlight",
nvbl_methods,
sizeof(struct nvbl_softc)
};
static devclass_t nvbl_devclass;
DRIVER_MODULE(nvbl, vgapci, nvbl_driver, nvbl_devclass, 0, 0);
static void
nvbl_identify(driver_t *driver, device_t parent)
{
if (OF_finddevice("mac-io/backlight") == -1)
return;
if (device_find_child(parent, "backlight", -1) == NULL)
device_add_child(parent, "backlight", -1);
}
static int
nvbl_probe(device_t dev)
{
char control[8];
phandle_t handle;
handle = OF_finddevice("mac-io/backlight");
if (handle == -1)
return (ENXIO);
if (OF_getprop(handle, "backlight-control", &control, sizeof(control)) < 0)
return (ENXIO);
if ((strcmp(control, "mnca") != 0) ||
pci_get_vendor(device_get_parent(dev)) != PCI_VENDOR_ID_NVIDIA)
return (ENXIO);
device_set_desc(dev, "PowerBook backlight for nVidia graphics");
return (0);
}
static int
nvbl_attach(device_t dev)
{
struct nvbl_softc *sc;
struct sysctl_ctx_list *ctx;
struct sysctl_oid *tree;
int rid;
sc = device_get_softc(dev);
rid = 0x10; /* BAR[0], for the MMIO register */
sc->sc_memr = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE | RF_SHAREABLE);
if (sc->sc_memr == NULL) {
device_printf(dev, "Could not alloc mem resource!\n");
return (ENXIO);
}
/* Turn on big-endian mode */
if (!(bus_read_stream_4(sc->sc_memr, NVIDIA_MMIO_PMC + 4) & 0x01000001)) {
bus_write_stream_4(sc->sc_memr, NVIDIA_MMIO_PMC + 4, 0x01000001);
mb();
}
ctx = device_get_sysctl_ctx(dev);
tree = device_get_sysctl_tree(dev);
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
"level", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
nvbl_sysctl, "I", "Backlight level (0-100)");
return (0);
}
static int
nvbl_setlevel(struct nvbl_softc *sc, int newlevel)
{
uint32_t pmc_reg;
if (newlevel > 100)
newlevel = 100;
if (newlevel < 0)
newlevel = 0;
if (newlevel > 0)
newlevel = (newlevel * NVIDIA_BRIGHT_SCALE) + NVIDIA_BRIGHT_MIN;
pmc_reg = bus_read_stream_4(sc->sc_memr, NVIDIA_PMC_OFF) & 0xffff;
pmc_reg |= NVIDIA_PMC_BL_EN | (newlevel << NVIDIA_PMC_BL_SHIFT);
bus_write_stream_4(sc->sc_memr, NVIDIA_PMC_OFF, pmc_reg);
return (0);
}
static int
nvbl_getlevel(struct nvbl_softc *sc)
{
uint16_t level;
level = bus_read_stream_2(sc->sc_memr, NVIDIA_PMC_OFF) & 0x7fff;
if (level < NVIDIA_BRIGHT_MIN)
return 0;
level = (level - NVIDIA_BRIGHT_MIN) / NVIDIA_BRIGHT_SCALE;
return (level);
}
static int
nvbl_sysctl(SYSCTL_HANDLER_ARGS)
{
struct nvbl_softc *sc;
int newlevel, error;
sc = arg1;
newlevel = nvbl_getlevel(sc);
error = sysctl_handle_int(oidp, &newlevel, 0, req);
if (error || !req->newptr)
return (error);
return (nvbl_setlevel(sc, newlevel));
}
|
