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/* $OpenBSD: abl.c,v 1.5 2022/04/06 18:59:27 naddy Exp $ */
/*
* Copyright (c) 2020 Marcus Glocker <mglocker@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Driver for controlling the screen backlight brightness on Apple machines.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <dev/acpi/acpivar.h>
#include <dev/acpi/acpidev.h>
#include <dev/acpi/amltypes.h>
#include <dev/acpi/dsdt.h>
#include <dev/pci/pcidevs.h>
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>
#ifdef ABL_DEBUG
#define DPRINTF(x) printf x
#else
#define DPRINTF(x)
#endif
#define ABL_IO_BASE_INTEL 0xb2
#define ABL_IO_BASE_NVIDIA 0x52e
#define ABL_IO_SIZE 2
#define ABL_IO_LO 0x00
#define ABL_IO_HI 0x01
#define ABL_BRIGHTNESS_MIN 0
#define ABL_BRIGHTNESS_MAX 15
struct abl_softc {
struct device sc_dev;
struct acpi_softc *sc_acpi;
struct aml_node *sc_devnode;
bus_space_tag_t sc_bt;
bus_space_handle_t sc_bh;
bus_addr_t sc_io_base;
uint8_t sc_brightness;
};
int abl_match(struct device *, void *, void *);
void abl_attach(struct device *, struct device *, void *);
int abl_get_brightness(struct abl_softc *);
int abl_set_brightness(struct abl_softc *, uint8_t);
/* Hooks for wsconsole brightness control. */
int abl_get_param(struct wsdisplay_param *);
int abl_set_param(struct wsdisplay_param *);
const struct cfattach abl_ca = {
sizeof(struct abl_softc), abl_match, abl_attach, NULL, NULL
};
struct cfdriver abl_cd = {
NULL, "abl", DV_DULL
};
const char *abl_hids[] = {
"APP0002", NULL
};
int
abl_match(struct device *parent, void *match, void *aux)
{
struct acpi_attach_args *aa = aux;
struct cfdata *cf = match;
return acpi_matchhids(aa, abl_hids, cf->cf_driver->cd_name);
}
void
abl_attach(struct device *parent, struct device *self, void *aux)
{
struct abl_softc *sc = (struct abl_softc *)self;
struct acpi_attach_args *aaa = aux;
struct aml_value res;
int64_t sta;
int reg;
pci_chipset_tag_t pc;
pcitag_t tag;
sc->sc_acpi = (struct acpi_softc *)parent;
sc->sc_devnode = aaa->aaa_node;
printf(": %s", sc->sc_devnode->name);
sta = acpi_getsta(sc->sc_acpi, sc->sc_devnode);
if ((sta & (STA_PRESENT | STA_ENABLED | STA_DEV_OK)) !=
(STA_PRESENT | STA_ENABLED | STA_DEV_OK)) {
printf(": not enabled\n");
return;
}
if (!(aml_evalname(sc->sc_acpi, sc->sc_devnode, "_CID", 0, NULL, &res)))
printf(" (%s)", res.v_string);
/* Backlight on non-iMacs is already handled differently. */
if (strncmp(hw_prod, "iMac", 4)) {
printf("\n");
return;
}
/*
* We need to check on what type of PCI controller we're running on to
* access the right I/O space.
*/
pc = pci_lookup_segment(0);
tag = pci_make_tag(pc, 0, 0, 0);
reg = pci_conf_read(pc, tag, PCI_ID_REG);
switch (PCI_VENDOR(reg)) {
case PCI_VENDOR_INTEL:
sc->sc_io_base = ABL_IO_BASE_INTEL;
break;
case PCI_VENDOR_NVIDIA:
sc->sc_io_base = ABL_IO_BASE_NVIDIA;
break;
default:
printf(": pci controller not supported\n");
return;
}
/*
* Map I/O space. This driver uses the ACPI SMI command port.
* This port has already been claimed by the generic ACPI code
* so we need to work around that here by calling _bus_space_map().
*/
sc->sc_bt = aaa->aaa_iot;
if (_bus_space_map(sc->sc_bt, sc->sc_io_base, ABL_IO_SIZE, 0,
&sc->sc_bh)) {
printf(": can't map register\n");
return;
}
/* Read the current brightness value initially. */
sc->sc_brightness = abl_get_brightness(sc);
/* Map wsconsole hook functions. */
ws_get_param = abl_get_param;
ws_set_param = abl_set_param;
printf("\n");
}
int
abl_get_brightness(struct abl_softc *sc)
{
uint8_t val;
bus_space_write_1(sc->sc_bt, sc->sc_bh, ABL_IO_HI, 0x03);
bus_space_write_1(sc->sc_bt, sc->sc_bh, ABL_IO_LO, 0xbf);
val = bus_space_read_1(sc->sc_bt, sc->sc_bh, ABL_IO_HI);
return (val >> 4);
}
int
abl_set_brightness(struct abl_softc *sc, uint8_t val)
{
bus_space_write_1(sc->sc_bt, sc->sc_bh, ABL_IO_HI, 0x04 | (val << 4));
bus_space_write_1(sc->sc_bt, sc->sc_bh, ABL_IO_LO, 0xbf);
return 0;
}
int
abl_get_param(struct wsdisplay_param *dp)
{
struct abl_softc *sc = abl_cd.cd_devs[0];
if (sc == NULL)
return -1;
switch (dp->param) {
case WSDISPLAYIO_PARAM_BRIGHTNESS:
DPRINTF(("abl_get_param: sc->sc_brightness = %d\n",
sc->sc_brightness));
dp->min = ABL_BRIGHTNESS_MIN;
dp->max = ABL_BRIGHTNESS_MAX;
dp->curval = sc->sc_brightness;
return 0;
default:
return -1;
}
}
int
abl_set_param(struct wsdisplay_param *dp)
{
struct abl_softc *sc = abl_cd.cd_devs[0];
if (sc == NULL)
return -1;
switch (dp->param) {
case WSDISPLAYIO_PARAM_BRIGHTNESS:
DPRINTF(("abl_set_param: curval = %d\n", dp->curval));
if (dp->curval < ABL_BRIGHTNESS_MIN)
dp->curval = 0;
if (dp->curval > ABL_BRIGHTNESS_MAX)
dp->curval = ABL_BRIGHTNESS_MAX;
abl_set_brightness(sc, dp->curval);
sc->sc_brightness = dp->curval;
return 0;
default:
return -1;
}
}
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