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/*-
* 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>
/* From the xf86-video-ati driver's radeon_reg.h */
#define RADEON_LVDS_GEN_CNTL 0x02d0
#define RADEON_LVDS_ON (1 << 0)
#define RADEON_LVDS_DISPLAY_DIS (1 << 1)
#define RADEON_LVDS_PANEL_TYPE (1 << 2)
#define RADEON_LVDS_PANEL_FORMAT (1 << 3)
#define RADEON_LVDS_RST_FM (1 << 6)
#define RADEON_LVDS_EN (1 << 7)
#define RADEON_LVDS_BL_MOD_LEVEL_SHIFT 8
#define RADEON_LVDS_BL_MOD_LEVEL_MASK (0xff << 8)
#define RADEON_LVDS_BL_MOD_EN (1 << 16)
#define RADEON_LVDS_DIGON (1 << 18)
#define RADEON_LVDS_BLON (1 << 19)
struct atibl_softc {
device_t dev;
struct resource *sc_memr;
};
static void atibl_identify(driver_t *driver, device_t parent);
static int atibl_probe(device_t dev);
static int atibl_attach(device_t dev);
static int atibl_setlevel(struct atibl_softc *sc, int newlevel);
static int atibl_getlevel(struct atibl_softc *sc);
static int atibl_sysctl(SYSCTL_HANDLER_ARGS);
static device_method_t atibl_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, atibl_identify),
DEVMETHOD(device_probe, atibl_probe),
DEVMETHOD(device_attach, atibl_attach),
{0, 0},
};
static driver_t atibl_driver = {
"backlight",
atibl_methods,
sizeof(struct atibl_softc)
};
static devclass_t atibl_devclass;
DRIVER_MODULE(atibl, vgapci, atibl_driver, atibl_devclass, 0, 0);
static void
atibl_identify(driver_t *driver, device_t parent)
{
if (device_find_child(parent, "backlight", -1) == NULL)
device_add_child(parent, "backlight", -1);
}
static int
atibl_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, "ati") != 0)
return (ENXIO);
device_set_desc(dev, "PowerBook backlight for ATI graphics");
return (0);
}
static int
atibl_attach(device_t dev)
{
struct atibl_softc *sc;
struct sysctl_ctx_list *ctx;
struct sysctl_oid *tree;
int rid;
sc = device_get_softc(dev);
rid = 0x18; /* BAR[2], 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);
}
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,
atibl_sysctl, "I", "Backlight level (0-100)");
return (0);
}
static int
atibl_setlevel(struct atibl_softc *sc, int newlevel)
{
uint32_t lvds_gen_cntl;
if (newlevel > 100)
newlevel = 100;
if (newlevel < 0)
newlevel = 0;
newlevel = (newlevel * 5) / 2 + 5;
lvds_gen_cntl = bus_read_4(sc->sc_memr, RADEON_LVDS_GEN_CNTL);
lvds_gen_cntl |= RADEON_LVDS_BL_MOD_EN;
lvds_gen_cntl &= ~RADEON_LVDS_BL_MOD_LEVEL_MASK;
lvds_gen_cntl |= (newlevel << RADEON_LVDS_BL_MOD_LEVEL_SHIFT) &
RADEON_LVDS_BL_MOD_LEVEL_MASK;
bus_write_4(sc->sc_memr, RADEON_LVDS_GEN_CNTL, lvds_gen_cntl);
return (0);
}
static int
atibl_getlevel(struct atibl_softc *sc)
{
uint32_t lvds_gen_cntl;
int level;
lvds_gen_cntl = bus_read_4(sc->sc_memr, RADEON_LVDS_GEN_CNTL);
level = ((lvds_gen_cntl & RADEON_LVDS_BL_MOD_LEVEL_MASK) >>
RADEON_LVDS_BL_MOD_LEVEL_SHIFT);
level = ((level - 5) * 2) / 5;
return (level);
}
static int
atibl_sysctl(SYSCTL_HANDLER_ARGS)
{
struct atibl_softc *sc;
int newlevel, error;
sc = arg1;
newlevel = atibl_getlevel(sc);
error = sysctl_handle_int(oidp, &newlevel, 0, req);
if (error || !req->newptr)
return (error);
return (atibl_setlevel(sc, newlevel));
}
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