1 /*- 2 * Copyright (c) 2012 Justin Hibbits 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/bus.h> 32 #include <sys/systm.h> 33 #include <sys/module.h> 34 #include <sys/kernel.h> 35 #include <sys/rman.h> 36 #include <sys/sysctl.h> 37 38 #include <machine/bus.h> 39 40 #include <dev/ofw/openfirm.h> 41 #include <dev/pci/pcivar.h> 42 43 #define PCI_VENDOR_ID_NVIDIA 0x10de 44 45 #define NVIDIA_BRIGHT_MIN (0x0ec) 46 #define NVIDIA_BRIGHT_MAX (0x538) 47 #define NVIDIA_BRIGHT_SCALE ((NVIDIA_BRIGHT_MAX - NVIDIA_BRIGHT_MIN)/100) 48 /* nVidia's MMIO registers are at PCI BAR[0] */ 49 #define NVIDIA_MMIO_PMC (0x0) 50 #define NVIDIA_PMC_OFF (NVIDIA_MMIO_PMC + 0x10f0) 51 #define NVIDIA_PMC_BL_SHIFT (16) 52 #define NVIDIA_PMC_BL_EN (1U << 31) 53 54 55 struct nvbl_softc { 56 device_t dev; 57 struct resource *sc_memr; 58 }; 59 60 static void nvbl_identify(driver_t *driver, device_t parent); 61 static int nvbl_probe(device_t dev); 62 static int nvbl_attach(device_t dev); 63 static int nvbl_setlevel(struct nvbl_softc *sc, int newlevel); 64 static int nvbl_getlevel(struct nvbl_softc *sc); 65 static int nvbl_sysctl(SYSCTL_HANDLER_ARGS); 66 67 static device_method_t nvbl_methods[] = { 68 /* Device interface */ 69 DEVMETHOD(device_identify, nvbl_identify), 70 DEVMETHOD(device_probe, nvbl_probe), 71 DEVMETHOD(device_attach, nvbl_attach), 72 {0, 0}, 73 }; 74 75 static driver_t nvbl_driver = { 76 "backlight", 77 nvbl_methods, 78 sizeof(struct nvbl_softc) 79 }; 80 81 static devclass_t nvbl_devclass; 82 83 DRIVER_MODULE(nvbl, vgapci, nvbl_driver, nvbl_devclass, 0, 0); 84 85 static void 86 nvbl_identify(driver_t *driver, device_t parent) 87 { 88 if (OF_finddevice("mac-io/backlight") == -1) 89 return; 90 if (device_find_child(parent, "backlight", -1) == NULL) 91 device_add_child(parent, "backlight", -1); 92 } 93 94 static int 95 nvbl_probe(device_t dev) 96 { 97 char control[8]; 98 phandle_t handle; 99 100 handle = OF_finddevice("mac-io/backlight"); 101 102 if (handle == -1) 103 return (ENXIO); 104 105 if (OF_getprop(handle, "backlight-control", &control, sizeof(control)) < 0) 106 return (ENXIO); 107 108 if ((strcmp(control, "mnca") != 0) || 109 pci_get_vendor(device_get_parent(dev)) != PCI_VENDOR_ID_NVIDIA) 110 return (ENXIO); 111 112 device_set_desc(dev, "PowerBook backlight for nVidia graphics"); 113 114 return (0); 115 } 116 117 static int 118 nvbl_attach(device_t dev) 119 { 120 struct nvbl_softc *sc; 121 struct sysctl_ctx_list *ctx; 122 struct sysctl_oid *tree; 123 int rid; 124 125 sc = device_get_softc(dev); 126 127 rid = 0x10; /* BAR[0], for the MMIO register */ 128 sc->sc_memr = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 129 RF_ACTIVE | RF_SHAREABLE); 130 if (sc->sc_memr == NULL) { 131 device_printf(dev, "Could not alloc mem resource!\n"); 132 return (ENXIO); 133 } 134 135 /* Turn on big-endian mode */ 136 if (!(bus_read_stream_4(sc->sc_memr, NVIDIA_MMIO_PMC + 4) & 0x01000001)) { 137 bus_write_stream_4(sc->sc_memr, NVIDIA_MMIO_PMC + 4, 0x01000001); 138 mb(); 139 } 140 141 ctx = device_get_sysctl_ctx(dev); 142 tree = device_get_sysctl_tree(dev); 143 144 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 145 "level", CTLTYPE_INT | CTLFLAG_RW, sc, 0, 146 nvbl_sysctl, "I", "Backlight level (0-100)"); 147 148 return (0); 149 } 150 151 static int 152 nvbl_setlevel(struct nvbl_softc *sc, int newlevel) 153 { 154 uint32_t pmc_reg; 155 156 if (newlevel > 100) 157 newlevel = 100; 158 159 if (newlevel < 0) 160 newlevel = 0; 161 162 if (newlevel > 0) 163 newlevel = (newlevel * NVIDIA_BRIGHT_SCALE) + NVIDIA_BRIGHT_MIN; 164 165 pmc_reg = bus_read_stream_4(sc->sc_memr, NVIDIA_PMC_OFF) & 0xffff; 166 pmc_reg |= NVIDIA_PMC_BL_EN | (newlevel << NVIDIA_PMC_BL_SHIFT); 167 bus_write_stream_4(sc->sc_memr, NVIDIA_PMC_OFF, pmc_reg); 168 169 return (0); 170 } 171 172 static int 173 nvbl_getlevel(struct nvbl_softc *sc) 174 { 175 uint16_t level; 176 177 level = bus_read_stream_2(sc->sc_memr, NVIDIA_PMC_OFF) & 0x7fff; 178 179 if (level < NVIDIA_BRIGHT_MIN) 180 return 0; 181 182 level = (level - NVIDIA_BRIGHT_MIN) / NVIDIA_BRIGHT_SCALE; 183 184 return (level); 185 } 186 187 static int 188 nvbl_sysctl(SYSCTL_HANDLER_ARGS) 189 { 190 struct nvbl_softc *sc; 191 int newlevel, error; 192 193 sc = arg1; 194 195 newlevel = nvbl_getlevel(sc); 196 197 error = sysctl_handle_int(oidp, &newlevel, 0, req); 198 199 if (error || !req->newptr) 200 return (error); 201 202 return (nvbl_setlevel(sc, newlevel)); 203 } 204