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 42 /* From the xf86-video-ati driver's radeon_reg.h */ 43 #define RADEON_LVDS_GEN_CNTL 0x02d0 44 #define RADEON_LVDS_ON (1 << 0) 45 #define RADEON_LVDS_DISPLAY_DIS (1 << 1) 46 #define RADEON_LVDS_PANEL_TYPE (1 << 2) 47 #define RADEON_LVDS_PANEL_FORMAT (1 << 3) 48 #define RADEON_LVDS_RST_FM (1 << 6) 49 #define RADEON_LVDS_EN (1 << 7) 50 #define RADEON_LVDS_BL_MOD_LEVEL_SHIFT 8 51 #define RADEON_LVDS_BL_MOD_LEVEL_MASK (0xff << 8) 52 #define RADEON_LVDS_BL_MOD_EN (1 << 16) 53 #define RADEON_LVDS_DIGON (1 << 18) 54 #define RADEON_LVDS_BLON (1 << 19) 55 56 struct atibl_softc { 57 device_t dev; 58 struct resource *sc_memr; 59 }; 60 61 static void atibl_identify(driver_t *driver, device_t parent); 62 static int atibl_probe(device_t dev); 63 static int atibl_attach(device_t dev); 64 static int atibl_setlevel(struct atibl_softc *sc, int newlevel); 65 static int atibl_getlevel(struct atibl_softc *sc); 66 static int atibl_sysctl(SYSCTL_HANDLER_ARGS); 67 68 static device_method_t atibl_methods[] = { 69 /* Device interface */ 70 DEVMETHOD(device_identify, atibl_identify), 71 DEVMETHOD(device_probe, atibl_probe), 72 DEVMETHOD(device_attach, atibl_attach), 73 {0, 0}, 74 }; 75 76 static driver_t atibl_driver = { 77 "backlight", 78 atibl_methods, 79 sizeof(struct atibl_softc) 80 }; 81 82 static devclass_t atibl_devclass; 83 84 DRIVER_MODULE(atibl, vgapci, atibl_driver, atibl_devclass, 0, 0); 85 86 static void 87 atibl_identify(driver_t *driver, device_t parent) 88 { 89 if (device_find_child(parent, "backlight", -1) == NULL) 90 device_add_child(parent, "backlight", -1); 91 } 92 93 static int 94 atibl_probe(device_t dev) 95 { 96 char control[8]; 97 phandle_t handle; 98 99 handle = OF_finddevice("mac-io/backlight"); 100 101 if (handle <= 0) 102 return (ENXIO); 103 104 if (OF_getprop(handle, "backlight-control", &control, sizeof(control)) < 0) 105 return (ENXIO); 106 107 if (strcmp(control, "ati") != 0) 108 return (ENXIO); 109 110 device_set_desc(dev, "PowerBook backlight"); 111 112 return (0); 113 } 114 115 static int 116 atibl_attach(device_t dev) 117 { 118 struct atibl_softc *sc; 119 struct sysctl_ctx_list *ctx; 120 struct sysctl_oid *tree; 121 int rid; 122 123 sc = device_get_softc(dev); 124 125 rid = 0x18; /* BAR[2], for the MMIO register */ 126 sc->sc_memr = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 127 RF_ACTIVE | RF_SHAREABLE); 128 if (sc->sc_memr == NULL) { 129 device_printf(dev, "Could not alloc mem resource!\n"); 130 return (ENXIO); 131 } 132 133 ctx = device_get_sysctl_ctx(dev); 134 tree = device_get_sysctl_tree(dev); 135 136 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 137 "level", CTLTYPE_INT | CTLFLAG_RW, sc, 0, 138 atibl_sysctl, "I", "Backlight level (0-100)"); 139 140 return (0); 141 } 142 143 static int 144 atibl_setlevel(struct atibl_softc *sc, int newlevel) 145 { 146 uint32_t lvds_gen_cntl; 147 148 if (newlevel > 100) 149 newlevel = 100; 150 151 if (newlevel < 0) 152 newlevel = 0; 153 154 newlevel = (newlevel * 5) / 2 + 5; 155 lvds_gen_cntl = bus_read_4(sc->sc_memr, RADEON_LVDS_GEN_CNTL); 156 lvds_gen_cntl |= RADEON_LVDS_BL_MOD_EN; 157 lvds_gen_cntl &= ~RADEON_LVDS_BL_MOD_LEVEL_MASK; 158 lvds_gen_cntl |= (newlevel << RADEON_LVDS_BL_MOD_LEVEL_SHIFT) & 159 RADEON_LVDS_BL_MOD_LEVEL_MASK; 160 bus_write_4(sc->sc_memr, RADEON_LVDS_GEN_CNTL, lvds_gen_cntl); 161 162 return (0); 163 } 164 165 static int 166 atibl_getlevel(struct atibl_softc *sc) 167 { 168 uint32_t lvds_gen_cntl; 169 int level; 170 171 lvds_gen_cntl = bus_read_4(sc->sc_memr, RADEON_LVDS_GEN_CNTL); 172 173 level = ((lvds_gen_cntl & RADEON_LVDS_BL_MOD_LEVEL_MASK) >> 174 RADEON_LVDS_BL_MOD_LEVEL_SHIFT); 175 level = ((level - 5) * 2) / 5; 176 177 return (level); 178 } 179 180 static int 181 atibl_sysctl(SYSCTL_HANDLER_ARGS) 182 { 183 struct atibl_softc *sc; 184 int newlevel, error; 185 186 sc = arg1; 187 188 newlevel = atibl_getlevel(sc); 189 190 error = sysctl_handle_int(oidp, &newlevel, 0, req); 191 192 if (error || !req->newptr) 193 return (error); 194 195 return (atibl_setlevel(sc, newlevel)); 196 } 197