atibl.c

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    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 == -1)
  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 for ATI graphics");
  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 }

Cache object: 4f7b7816feb338787e6e64f86752b918

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powermac/atibl.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powermac/atibl.c