Make asmc(4) attach through acpi(4) instead of isa(4).

This e.g. makes the driver also work on iMac11,2.

ok kettenis@, jung@

2 files changed, 750 insertions, 1 deletions

diff --git a/sys/dev/acpi/asmc.c b/sys/dev/acpi/asmc.c
new file mode 100644
index 00000000000..707226591a1
--- /dev/null
+++ b/sys/dev/acpi/asmc.c
@@ -0,0 +1,744 @@
+/*	$OpenBSD: asmc.c,v 1.1 2020/09/12 07:47:26 mglocker Exp $	*/
+/*
+ * Copyright (c) 2015 Joerg Jung <jung@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 Apple's System Management Controller (SMC) an H8S/2117 chip
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/kernel.h>
+#include <sys/rwlock.h>
+#include <sys/task.h>
+#include <sys/sensors.h>
+
+#include <machine/bus.h>
+
+#include <dev/acpi/acpivar.h>
+#include <dev/acpi/acpidev.h>
+#include <dev/acpi/amltypes.h>
+#include <dev/acpi/dsdt.h>
+
+#include <dev/wscons/wsconsio.h>
+
+#define ASMC_BASE	0x300	/* SMC base address */
+#define ASMC_IOSIZE	32	/* I/O region size 0x300-0x31f */
+
+#define ASMC_DATA	0x00	/* SMC data port offset */
+#define ASMC_COMMAND	0x04	/* SMC command port offset */
+#define ASMC_STATUS	0x1e	/* SMC status port offset */
+#define ASMC_INTERRUPT	0x1f	/* SMC interrupt port offset */
+
+#define ASMC_READ	0x10	/* SMC read command */
+#define ASMC_WRITE	0x11	/* SMC write command */
+#define ASMC_INFO	0x13	/* SMC info/type command */
+
+#define ASMC_OBF	0x01	/* Output buffer full */
+#define ASMC_IBF	0x02	/* Input buffer full */
+#define ASMC_ACCEPT	0x04
+
+#define ASMC_RETRY	3
+#define ASMC_MAXLEN	32	/* SMC maximum data size len */
+#define ASMC_NOTFOUND	0x84	/* SMC status key not found */
+
+#define ASMC_MAXTEMP	101	/* known asmc_prods temperature sensor keys */
+#define ASMC_MAXFAN	10	/* fan keys with digits 0-9 */
+#define ASMC_MAXLIGHT	2	/* left and right light sensor */
+#define ASMC_MAXMOTION	3	/* x y z axis motion sensors */
+
+struct asmc_prod {
+	const char	*pr_name;
+	uint8_t		 pr_light;
+	const char	*pr_temp[ASMC_MAXTEMP];
+};
+
+struct asmc_softc {
+	struct device		 sc_dev;
+
+	struct acpi_softc       *sc_acpi;
+	struct aml_node         *sc_devnode;
+
+	bus_space_tag_t		 sc_iot;
+	bus_space_handle_t	 sc_ioh;
+
+	struct asmc_prod	*sc_prod;
+	uint8_t			 sc_nfans;	/* number of fans */
+	uint8_t			 sc_lightlen;	/* light data len */
+	uint8_t			 sc_backlight;	/* keyboard backlight value */
+
+	struct rwlock		 sc_lock;
+	struct task		 sc_task_backlight;
+
+	struct ksensor		 sc_sensor_temp[ASMC_MAXTEMP];
+	struct ksensor		 sc_sensor_fan[ASMC_MAXFAN];
+	struct ksensor		 sc_sensor_light[ASMC_MAXLIGHT];
+	struct ksensor		 sc_sensor_motion[ASMC_MAXMOTION];
+	struct ksensordev	 sc_sensor_dev;
+	struct sensor_task	*sc_sensor_task;
+};
+
+int	asmc_try(struct asmc_softc *, int, const char *, uint8_t *, uint8_t);
+void	asmc_init(struct asmc_softc *);
+void	asmc_update(void *);
+
+int	asmc_match(struct device *, void *, void *);
+void	asmc_attach(struct device *, struct device *, void *);
+int 	asmc_detach(struct device *, int);
+int	asmc_activate(struct device *, int);
+
+/* wskbd hook functions */
+void	asmc_backlight(void *);
+int	asmc_get_backlight(struct wskbd_backlight *);
+int	asmc_set_backlight(struct wskbd_backlight *);
+extern int (*wskbd_get_backlight)(struct wskbd_backlight *);
+extern int (*wskbd_set_backlight)(struct wskbd_backlight *);
+
+const struct cfattach asmc_ca = {
+	sizeof(struct asmc_softc), asmc_match, asmc_attach, NULL, asmc_activate
+};
+
+struct cfdriver asmc_cd = {
+	NULL, "asmc", DV_DULL
+};
+
+const char *asmc_hids[] = {
+	"APP0001", NULL
+};
+
+static struct asmc_prod asmc_prods[] = {
+	{ "MacBookAir", 1, {
+		"TB0T", "TB1S", "TB1T", "TB2S", "TB2T", "TBXT", "TC0C", "TC0D",
+		"TC0E", "TC0F", "TC0P", "TC1C", "TC1E", "TC2C", "TCFP", "TCGC",
+		"TCHP", "TCMX", "TCSA", "TCXC", "TCZ3", "TCZ4", "TCZ5", "TG0E",
+		"TG1E", "TG2E", "TGZ3", "TGZ4", "TGZ5", "TH0A", "TH0B", "TH0V",
+		"TH0a", "TH0b", "THSP", "TM0P", "TN0D", "TPCD", "TS2P", "TTF0",
+		"TV0P", "TVFP", "TW0P", "Ta0P", "Th0H", "Th0P", "Th1H", "Tm0P",
+		"Tm1P", "Tp0P", "Tp1P", "TpFP", "Ts0P", "Ts0S", NULL }
+	},
+	{ "MacBookPro", 1, {
+		"TA0P", "TA1P", "TALP", "TB0T", "TB1T", "TB2T", "TB3T", "TBXT",
+		"TC0C", "TC0D", "TC0E", "TC0F", "TC0P", "TC1C", "TC2C", "TC3C",
+		"TC4C", "TCGC", "TCSA", "TCXC", "TG0D", "TG0F", "TG0H", "TG0P",
+		"TG0T", "TG1D", "TG1F", "TG1H", "TG1d", "TH0A", "TH0B", "TH0F",
+		"TH0R", "TH0V", "TH0a", "TH0b", "TH0c", "TH0x", "THSP", "TM0P",
+		"TM0S", "TMCD", "TN0D", "TN0P", "TN0S", "TN1D", "TN1F", "TN1G",
+		"TN1S", "TP0P", "TPCD", "TTF0", "TW0P", "Ta0P", "TaSP", "Th0H",
+		"Th1H", "Th2H", "Tm0P", "Ts0P", "Ts0S", "Ts1P", "Ts1S", NULL }
+	},
+	{ "MacBook", 0, {
+		"TB0T", "TB1T", "TB2T", "TB3T", "TC0D", "TC0P", "TM0P", "TN0D",
+		"TN0P", "TN1P", "TTF0", "TW0P", "Th0H", "Th0S", "Th1H", "ThFH",
+		"Ts0P", "Ts0S", NULL }
+	},
+	{ "MacPro", 0, {
+		"TA0P", "TC0C", "TC0D", "TC0P", "TC1C", "TC1D", "TC2C", "TC2D",
+		"TC3C", "TC3D", "TCAC", "TCAD", "TCAG", "TCAH", "TCAS", "TCBC",
+		"TCBD", "TCBG", "TCBH", "TCBS", "TH0P", "TH1F", "TH1P", "TH1V",
+		"TH2F", "TH2P", "TH2V", "TH3F", "TH3P", "TH3V", "TH4F", "TH4P",
+		"TH4V", "THPS", "THTG", "TM0P", "TM0S", "TM1P", "TM1S", "TM2P",
+		"TM2S", "TM2V", "TM3P", "TM3S", "TM3V", "TM4P", "TM5P", "TM6P",
+		"TM6V", "TM7P", "TM7V", "TM8P", "TM8S", "TM8V", "TM9P", "TM9S",
+		"TM9V", "TMA1", "TMA2", "TMA3", "TMA4", "TMAP", "TMAS", "TMB1",
+		"TMB2", "TMB3", "TMB4", "TMBS", "TMHS", "TMLS", "TMPS", "TMPV",
+		"TMTG", "TN0C", "TN0D", "TN0H", "TNTG", "TS0C", "Te1F", "Te1P",
+		"Te1S", "Te2F", "Te2S", "Te3F", "Te3S", "Te4F", "Te4S", "Te5F",
+		"Te5S", "TeGG", "TeGP", "TeRG", "TeRP", "TeRV", "Tp0C", "Tp1C",
+		"TpPS", "TpTG", "Tv0S", "Tv1S", NULL }
+	},
+	{ "MacMini", 0, {
+		"TC0D", "TC0H", "TC0P", "TH0P", "TN0D", "TN0P", "TN1P", "TW0P",
+		NULL }
+	},
+	{ "iMac", 0, {
+		"TA0P", "TC0D", "TC0H", "TC0P", "TG0D", "TG0H", "TG0P", "TH0P",
+		"TL0P", "TN0D", "TN0H", "TN0P", "TO0P", "TW0P", "Tm0P", "Tp0C",
+		"Tp0P", NULL }
+	},
+	{ NULL, 0, { NULL } }
+};
+
+static const char *asmc_temp_desc[][2] = {
+	{ "TA0P", "ambient" }, { "TA0P", "hdd bay 1" },
+	{ "TA0S", "pci slot 1 pos 1" }, { "TA1P", "ambient 2" },
+	{ "TA1S", "pci slot 1 pos 2" }, { "TA2S", "pci slot 2 pos 1" },
+	{ "TA3S", "pci slot 2 pos 2" },
+	{ "TB0T", "enclosure bottom" }, { "TB1T", "enclosure bottom 2" },
+	{ "TB2T", "enclosure bottom 3" }, { "TB3T", "enclosure bottom 4" },
+	{ "TC0D", "cpu0 die core" }, { "TC0H", "cpu0 heatsink" },
+	{ "TC0P", "cpu0 proximity" },
+	{ "TC1D", "cpu1" }, { "TC2D", "cpu2" }, { "TC3D", "cpu3" },
+	{ "TCAH", "cpu0" }, { "TCBH", "cpu1" }, { "TCCH", "cpu2" },
+	{ "TCDH", "cpu3" },
+	{ "TG0D", "gpu0 diode" }, { "TG0H", "gpu0 heatsink" },
+	{ "TG0P", "gpu0 proximity" },
+	{ "TG1H", "gpu heatsink 2" },
+	{ "TH0P", "hdd bay 1" }, { "TH1P", "hdd bay 2" },
+	{ "TH2P", "hdd bay 3" }, { "TH3P", "hdd bay 4" },
+	{ "TL0P", "lcd proximity"},
+	{ "TM0P", "mem bank a1" }, { "TM0S", "mem module a1" },
+	{ "TM1P", "mem bank a2" }, { "TM1S", "mem module a2" },
+	{ "TM2P", "mem bank a3" }, { "TM2S", "mem module a3" },
+	{ "TM3P", "mem bank a4" }, { "TM3S", "mem module a4" },
+	{ "TM4P", "mem bank a5" }, { "TM4S", "mem module a5" },
+	{ "TM5P", "mem bank a6" }, { "TM5S", "mem module a6" },
+	{ "TM6P", "mem bank a7" }, { "TM6S", "mem module a7" },
+	{ "TM7P", "mem bank a8" }, { "TM7S", "mem module a8" },
+	{ "TM8P", "mem bank b1" }, { "TM8S", "mem module b1" },
+	{ "TM9P", "mem bank b2" }, { "TM9S", "mem module b2" },
+	{ "TMA1", "ram a1" }, { "TMA2", "ram a2" },
+	{ "TMA3", "ram a3" }, { "TMA4", "ram a4" },
+	{ "TMB1", "ram b1" }, { "TMB2", "ram b2" },
+	{ "TMB3", "ram b3" }, { "TMB4", "ram b4" },
+	{ "TMAP", "mem bank b3" }, { "TMAS", "mem module b3" },
+	{ "TMBP", "mem bank b4" }, { "TMBS", "mem module b4" },
+	{ "TMCP", "mem bank b5" }, { "TMCS", "mem module b5" },
+	{ "TMDP", "mem bank b6" }, { "TMDS", "mem module b6" },
+	{ "TMEP", "mem bank b7" }, { "TMES", "mem module b7" },
+	{ "TMFP", "mem bank b8" }, { "TMFS", "mem module b8" },
+	{ "TN0D", "northbridge die core" }, { "TN0H", "northbridge" },
+	{ "TN0P", "northbridge proximity" }, { "TN1P", "northbridge 2" },
+	{ "TO0P", "optical drive" }, { "TS0C", "expansion slots" },
+	{ "TW0P", "wireless airport card" },
+	{ "Th0H", "main heatsink a" }, { "Th1H", "main heatsink b" },
+	{ "Th2H", "main heatsink c" },
+	{ "Tm0P", "memory controller" },
+	{ "Tp0C", "power supply 1" }, { "Tp0P", "power supply 1" },
+	{ "Tp1C", "power supply 2" }, { "Tp1P", "power supply 2" },
+	{ "Tp2P", "power supply 3" }, { "Tp3P", "power supply 4" },
+	{ "Tp4P", "power supply 5" }, { "Tp5P", "power supply 6" },
+	{ NULL, NULL }
+};
+
+static const char *asmc_fan_loc[] = {
+	"left lower front", "center lower front", "right lower front",
+	"left mid front",   "center mid front",   "right mid front",
+	"left upper front", "center upper front", "right upper front",
+	"left lower rear",  "center lower rear",  "right lower rear",
+	"left mid rear",    "center mid rear",    "right mid rear",
+	"left upper rear",  "center upper rear",  "right upper rear"
+};
+
+static const char *asmc_light_desc[ASMC_MAXLIGHT] = {
+	"left", "right"
+};
+
+int
+asmc_match(struct device *parent, void *match, void *aux)
+{
+	struct acpi_attach_args *aa = aux;
+	struct cfdata *cf = match;
+
+	return acpi_matchhids(aa, asmc_hids, cf->cf_driver->cd_name);
+}
+
+void
+asmc_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct asmc_softc *sc = (struct asmc_softc *)self;
+	struct acpi_attach_args *aaa = aux;
+	struct aml_value res;
+	int64_t sta;
+	uint8_t buf[6];
+	int i, r;
+
+	if (!hw_vendor || !hw_prod || strncmp(hw_vendor, "Apple", 5))
+		return;
+
+	for (i = 0; asmc_prods[i].pr_name && !sc->sc_prod; i++)
+		if (!strncasecmp(asmc_prods[i].pr_name, hw_prod,
+		    strlen(asmc_prods[i].pr_name)))
+			sc->sc_prod = &asmc_prods[i];
+	if (!sc->sc_prod)
+		return;
+
+	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);
+
+	if (aaa->aaa_naddr < 1) {
+		printf(": no registers\n");
+		return;
+	}
+
+	printf (" addr 0x%llx/0x%llx", aaa->aaa_addr[0], aaa->aaa_size[0]);
+
+	sc->sc_iot = aaa->aaa_bst[0];
+	if (bus_space_map(sc->sc_iot, aaa->aaa_addr[0], aaa->aaa_size[0], 0,
+	    &sc->sc_ioh)) {
+		printf(": can't map registers\n");
+		return;
+	}
+
+	rw_init(&sc->sc_lock, sc->sc_dev.dv_xname);
+
+	if ((r = asmc_try(sc, ASMC_READ, "REV ", buf, 6))) {
+		printf(": revision failed (0x%x)\n", r);
+		bus_space_unmap(sc->sc_iot, aaa->aaa_addr[0], aaa->aaa_size[0]);
+		return;
+	}
+	printf(": rev %x.%x%x%x", buf[0], buf[1], buf[2],
+	    ntohs(*(uint16_t *)buf + 4));
+
+	if ((r = asmc_try(sc, ASMC_READ, "#KEY", buf, 4))) {
+		printf(", no of keys failed (0x%x)\n", r);
+		bus_space_unmap(sc->sc_iot, aaa->aaa_addr[0], aaa->aaa_size[0]);
+		return;
+	}
+	printf(", %u key%s\n", ntohl(*(uint32_t *)buf),
+	    (ntohl(*(uint32_t *)buf) == 1) ? "" : "s");
+
+	/* keyboard backlight led is optional */
+	sc->sc_backlight = buf[0] = 127, buf[1] = 0;
+	if ((r = asmc_try(sc, ASMC_WRITE, "LKSB", buf, 2))) {
+		if (r != ASMC_NOTFOUND)
+			printf("%s: keyboard backlight failed (0x%x)\n",
+			    sc->sc_dev.dv_xname, r);
+	} else {
+		wskbd_get_backlight = asmc_get_backlight;
+		wskbd_set_backlight = asmc_set_backlight;
+	}
+	task_set(&sc->sc_task_backlight, asmc_backlight, sc);
+
+	strlcpy(sc->sc_sensor_dev.xname, sc->sc_dev.dv_xname,
+	    sizeof(sc->sc_sensor_dev.xname));
+	for (i = 0; i < ASMC_MAXTEMP; i++) {
+		sc->sc_sensor_temp[i].flags |= SENSOR_FINVALID;
+		sc->sc_sensor_temp[i].flags |= SENSOR_FUNKNOWN;
+	}
+	for (i = 0; i < ASMC_MAXFAN; i++) {
+		sc->sc_sensor_fan[i].flags |= SENSOR_FINVALID;
+		sc->sc_sensor_fan[i].flags |= SENSOR_FUNKNOWN;
+	}
+	for (i = 0; i < ASMC_MAXLIGHT; i++) {
+		sc->sc_sensor_light[i].flags |= SENSOR_FINVALID;
+		sc->sc_sensor_light[i].flags |= SENSOR_FUNKNOWN;
+	}
+	for (i = 0; i < ASMC_MAXMOTION; i++) {
+		sc->sc_sensor_motion[i].flags |= SENSOR_FINVALID;
+		sc->sc_sensor_motion[i].flags |= SENSOR_FUNKNOWN;
+	}
+	asmc_init(sc);
+
+	if (!(sc->sc_sensor_task = sensor_task_register(sc, asmc_update, 5))) {
+		printf("%s: unable to register task\n", sc->sc_dev.dv_xname);
+		bus_space_unmap(sc->sc_iot, aaa->aaa_addr[0], aaa->aaa_size[0]);
+		return;
+	}
+	sensordev_install(&sc->sc_sensor_dev);
+}
+
+int
+asmc_detach(struct device *self, int flags)
+{
+	struct asmc_softc *sc = (struct asmc_softc *)self;
+	uint8_t buf[2] = { (sc->sc_backlight = 0), 0 };
+	int i;
+
+	if (sc->sc_sensor_task) {
+		sensor_task_unregister(sc->sc_sensor_task);
+		sc->sc_sensor_task = NULL;
+	}
+	sensordev_deinstall(&sc->sc_sensor_dev);
+	for (i = 0; i < ASMC_MAXMOTION; i++)
+		sensor_detach(&sc->sc_sensor_dev, &sc->sc_sensor_motion[i]);
+	for (i = 0; i < ASMC_MAXLIGHT; i++)
+		sensor_detach(&sc->sc_sensor_dev, &sc->sc_sensor_light[i]);
+	for (i = 0; i < ASMC_MAXFAN; i++)
+		sensor_detach(&sc->sc_sensor_dev, &sc->sc_sensor_fan[i]);
+	for (i = 0; i < ASMC_MAXTEMP; i++)
+		sensor_detach(&sc->sc_sensor_dev, &sc->sc_sensor_temp[i]);
+
+	task_del(systq, &sc->sc_task_backlight);
+	asmc_try(sc, ASMC_WRITE, "LKSB", buf, 2);
+	return 0;
+}
+
+int
+asmc_activate(struct device *self, int act)
+{
+	struct asmc_softc *sc = (struct asmc_softc *)self;
+
+	switch (act) {
+	case DVACT_WAKEUP:
+		asmc_backlight(sc);
+		break;
+	}
+
+	return 0;
+}
+
+void
+asmc_backlight(void *arg)
+{
+	struct asmc_softc *sc = arg;
+	uint8_t buf[2] = { sc->sc_backlight, 0 };
+	int r;
+
+	if ((r = asmc_try(sc, ASMC_WRITE, "LKSB", buf, 2)))
+		printf("%s: keyboard backlight failed (0x%x)\n",
+		    sc->sc_dev.dv_xname, r);
+}
+
+int
+asmc_get_backlight(struct wskbd_backlight *kbl)
+{
+	struct asmc_softc *sc = asmc_cd.cd_devs[0];
+
+	KASSERT(sc != NULL);
+	kbl->min = 0;
+	kbl->max = 0xff;
+	kbl->curval = sc->sc_backlight;
+	return 0;
+}
+
+int
+asmc_set_backlight(struct wskbd_backlight *kbl)
+{
+	struct asmc_softc *sc = asmc_cd.cd_devs[0];
+
+	KASSERT(sc != NULL);
+	if (kbl->curval > 0xff)
+		return EINVAL;
+	sc->sc_backlight = kbl->curval;
+	task_add(systq, &sc->sc_task_backlight);
+	return 0;
+}
+
+static uint8_t
+asmc_status(struct asmc_softc *sc)
+{
+	return bus_space_read_1(sc->sc_iot, sc->sc_ioh, ASMC_STATUS);
+}
+
+static int
+asmc_wait(struct asmc_softc *sc, uint8_t mask, uint8_t val)
+{
+	int i;
+
+	for (i = 0; i < 500; i++) { /* wait up to 5 ms */
+		if ((bus_space_read_1(sc->sc_iot, sc->sc_ioh, ASMC_COMMAND) &
+		    mask) == val)
+			return 0;
+		delay(10);
+	}
+	return ETIMEDOUT;
+}
+
+static int
+asmc_write(struct asmc_softc *sc, uint8_t off, uint8_t val)
+{
+	if (asmc_wait(sc, ASMC_IBF, 0))
+		return 1;
+	bus_space_write_1(sc->sc_iot, sc->sc_ioh, off, val);
+	if (asmc_wait(sc, ASMC_ACCEPT, ASMC_ACCEPT))
+		return 1;
+	return 0;
+}
+
+static int
+asmc_read(struct asmc_softc *sc, uint8_t off, uint8_t *buf)
+{
+	if (asmc_wait(sc, ASMC_OBF, ASMC_OBF))
+		return 1;
+	*buf = bus_space_read_1(sc->sc_iot, sc->sc_ioh, off);
+	return 0;
+}
+
+static int
+asmc_command(struct asmc_softc *sc, int cmd, const char *key, uint8_t *buf,
+    uint8_t len)
+{
+	int i;
+
+	if (len > ASMC_MAXLEN)
+		return 1;
+	if (asmc_write(sc, ASMC_COMMAND, cmd))
+		return 1;
+	for (i = 0; i < 4; i++)
+		if (asmc_write(sc, ASMC_DATA, key[i]))
+			return 1;
+	if (asmc_write(sc, ASMC_DATA, len))
+		return 1;
+	if (cmd == ASMC_READ || cmd == ASMC_INFO) {
+		for (i = 0; i < len; i++)
+			if (asmc_read(sc, ASMC_DATA, &buf[i]))
+				return 1;
+	} else if (cmd == ASMC_WRITE) {
+		for (i = 0; i < len; i++)
+			if (asmc_write(sc, ASMC_DATA, buf[i]))
+				return 1;
+	} else
+		return 1;
+	return 0;
+}
+
+int
+asmc_try(struct asmc_softc *sc, int cmd, const char *key, uint8_t *buf,
+    uint8_t len)
+{
+	uint8_t s;
+	int i, r;
+
+	rw_enter_write(&sc->sc_lock);
+	for (i = 0; i < ASMC_RETRY; i++)
+		if (!(r = asmc_command(sc, cmd, key, buf, len)))
+			break;
+	if (r && (s = asmc_status(sc)))
+		r = s;
+	rw_exit_write(&sc->sc_lock);
+
+	return r;
+}
+
+static uint32_t
+asmc_uk(uint8_t *buf)
+{
+	/* spe78: floating point, signed, 7 bits exponent, 8 bits fraction */
+	return (((int16_t)ntohs(*(uint16_t *)buf)) >> 8) * 1000000 + 273150000;
+}
+
+static uint16_t
+asmc_rpm(uint8_t *buf)
+{
+	/* fpe2: floating point, unsigned, 14 bits exponent, 2 bits fraction */
+	return ntohs(*(uint16_t *)buf) >> 2;
+}
+
+static uint32_t
+asmc_lux(uint8_t *buf, uint8_t lightlen)
+{
+	/* newer macbooks report a 10 bit big endian value */
+	return (lightlen == 10) ?
+	    /* fp18.14: floating point, 18 bits exponent, 14 bits fraction */
+	    (ntohl(*(uint32_t *)(buf + 6)) >> 14) * 1000000 :
+	    /*
+	     * todo: calculate lux from ADC raw data
+	     * buf[1] true/false for high/low gain chan reads
+	     * chan 0: ntohs(*(uint16_t *)(buf + 2));
+	     * chan 1: ntohs(*(uint16_t *)(buf + 4));
+	     */
+	    ntohs(*(uint16_t *)(buf + 2)) * 1000000;
+}
+
+static int
+asmc_temp(struct asmc_softc *sc, uint8_t idx, int init)
+{
+	uint8_t buf[2];
+	uint32_t uk;
+	int i, r;
+
+	if ((r = asmc_try(sc, ASMC_READ, sc->sc_prod->pr_temp[idx], buf, 2)))
+		return r;
+	if ((uk = asmc_uk(buf)) < 253150000) /* ignore unlikely values */
+		return 0;
+	sc->sc_sensor_temp[idx].value = uk;
+	sc->sc_sensor_temp[idx].flags &= ~SENSOR_FUNKNOWN;
+
+	if (!init)
+		return 0;
+
+	strlcpy(sc->sc_sensor_temp[idx].desc, sc->sc_prod->pr_temp[idx],
+	    sizeof(sc->sc_sensor_temp[idx].desc));
+	for (i = 0; asmc_temp_desc[i][0]; i++)
+		if (!strcmp(asmc_temp_desc[i][0], sc->sc_prod->pr_temp[idx]))
+			break;
+	if (asmc_temp_desc[i][0]) {
+		strlcat(sc->sc_sensor_temp[idx].desc, " ",
+		    sizeof(sc->sc_sensor_temp[idx].desc));
+		strlcat(sc->sc_sensor_temp[idx].desc, asmc_temp_desc[i][1],
+		    sizeof(sc->sc_sensor_temp[idx].desc));
+	}
+	sc->sc_sensor_temp[idx].type = SENSOR_TEMP;
+	sc->sc_sensor_temp[idx].flags &= ~SENSOR_FINVALID;
+	sensor_attach(&sc->sc_sensor_dev, &sc->sc_sensor_temp[idx]);
+	return 0;
+}
+
+static int
+asmc_fan(struct asmc_softc *sc, uint8_t idx, int init)
+{
+	char key[5];
+	uint8_t buf[17], *end;
+	int r;
+
+	snprintf(key, sizeof(key), "F%dAc", idx);
+	if ((r = asmc_try(sc, ASMC_READ, key, buf, 2)))
+		return r;
+	sc->sc_sensor_fan[idx].value = asmc_rpm(buf);
+	sc->sc_sensor_fan[idx].flags &= ~SENSOR_FUNKNOWN;
+
+	if (!init)
+		return 0;
+
+	snprintf(key, sizeof(key), "F%dID", idx);
+	if ((r = asmc_try(sc, ASMC_READ, key, buf, 16)))
+		return r;
+	buf[16] = '\0';
+	end = buf + 4 + strlen((char *)buf + 4) - 1;
+	while (buf + 4 < end && *end == ' ') /* trim trailing spaces */
+		*end-- = '\0';
+	strlcpy(sc->sc_sensor_fan[idx].desc, buf + 4,
+	    sizeof(sc->sc_sensor_fan[idx].desc));
+	if (buf[2] < nitems(asmc_fan_loc)) {
+		strlcat(sc->sc_sensor_fan[idx].desc, ", ",
+		    sizeof(sc->sc_sensor_fan[idx].desc));
+		strlcat(sc->sc_sensor_fan[idx].desc, asmc_fan_loc[buf[2]],
+		    sizeof(sc->sc_sensor_fan[idx].desc));
+	}
+	sc->sc_sensor_fan[idx].type = SENSOR_FANRPM;
+	sc->sc_sensor_fan[idx].flags &= ~SENSOR_FINVALID;
+	sensor_attach(&sc->sc_sensor_dev, &sc->sc_sensor_fan[idx]);
+	return 0;
+}
+
+static int
+asmc_light(struct asmc_softc *sc, uint8_t idx, int init)
+{
+	char key[5];
+	uint8_t buf[10];
+	int r;
+
+	snprintf(key, sizeof(key), "ALV%d", idx);
+	if (!sc->sc_lightlen) {
+		if ((r = asmc_try(sc, ASMC_INFO, key, buf, 6)))
+			return r;
+		if ((sc->sc_lightlen = buf[0]) > 10)
+			return 1;
+	}
+	if ((r = asmc_try(sc, ASMC_READ, key, buf, sc->sc_lightlen)))
+		return r;
+	if (!buf[0]) /* valid data? */
+		return 0;
+	sc->sc_sensor_light[idx].value = asmc_lux(buf, sc->sc_lightlen);
+	sc->sc_sensor_light[idx].flags &= ~SENSOR_FUNKNOWN;
+
+	if (!init)
+		return 0;
+
+	strlcpy(sc->sc_sensor_light[idx].desc, asmc_light_desc[idx],
+	    sizeof(sc->sc_sensor_light[idx].desc));
+	sc->sc_sensor_light[idx].type = SENSOR_LUX;
+	sc->sc_sensor_light[idx].flags &= ~SENSOR_FINVALID;
+	sensor_attach(&sc->sc_sensor_dev, &sc->sc_sensor_light[idx]);
+	return 0;
+}
+
+#if 0 /* todo: implement motion sensors update and initialization */
+static int
+asmc_motion(struct asmc_softc *sc, uint8_t idx, int init)
+{
+	char key[5];
+	uint8_t buf[2];
+	int r;
+
+	snprintf(key, sizeof(key), "MO_%c", 88 + idx); /* X, Y, Z */
+	if ((r = asmc_try(sc, ASMC_READ, key, buf, 2)))
+		return r;
+	sc->sc_sensor_motion[idx].value = 0;
+	sc->sc_sensor_motion[idx].flags &= ~SENSOR_FUNKNOWN;
+
+	if (!init)
+		return 0;
+
+	/* todo: setup and attach sensors and description */
+	strlcpy(sc->sc_sensor_motion[idx].desc, 120 + idx, /* x, y, z */
+	    sizeof(sc->sc_sensor_motion[idx].desc));
+	strlcat(sc->sc_sensor_motion[idx].desc, "-axis",
+	    sizeof(sc->sc_sensor_motion[idx].desc));
+	sc->sc_sensor_motion[idx].type = SENSOR_ACCEL;
+	sc->sc_sensor_motion[idx].flags &= ~SENSOR_FINVALID;
+	sensor_attach(&sc->sc_sensor_dev, &sc->sc_sensor_motion[idx]);
+	return 0;
+}
+#endif
+
+void
+asmc_init(struct asmc_softc *sc)
+{
+	uint8_t buf[2];
+	int i, r;
+
+	/* number of temperature sensors depends on product */
+	for (i = 0; i < ASMC_MAXTEMP && sc->sc_prod->pr_temp[i]; i++)
+		if ((r = asmc_temp(sc, i, 1)) && r != ASMC_NOTFOUND)
+			printf("%s: read temp %d failed (0x%x)\n",
+			    sc->sc_dev.dv_xname, i, r);
+	/* number of fan sensors depends on product */
+	if ((r = asmc_try(sc, ASMC_READ, "FNum", buf, 1)))
+		printf("%s: read FNum failed (0x%x)\n",
+		    sc->sc_dev.dv_xname, r);
+	else
+		sc->sc_nfans = buf[0];
+	for (i = 0; i < sc->sc_nfans && i < ASMC_MAXFAN; i++)
+		if ((r = asmc_fan(sc, i, 1)) && r != ASMC_NOTFOUND)
+			printf("%s: read fan %d failed (0x%x)\n",
+			    sc->sc_dev.dv_xname, i, r);
+	/* left and right light sensors are optional */
+	for (i = 0; sc->sc_prod->pr_light && i < ASMC_MAXLIGHT; i++)
+		if ((r = asmc_light(sc, i, 1)) && r != ASMC_NOTFOUND)
+			printf("%s: read light %d failed (0x%x)\n",
+			    sc->sc_dev.dv_xname, i, r);
+	/* motion sensors are optional */
+	if ((r = asmc_try(sc, ASMC_READ, "MOCN", buf, 2)) &&
+	    r != ASMC_NOTFOUND)
+		printf("%s: read MOCN failed (0x%x)\n",
+		    sc->sc_dev.dv_xname, r);
+#if 0 /* todo: initialize sudden motion sensors and setup interrupt handling */
+	buf[0] = 0xe0, buf[1] = 0xf8;
+	if ((r = asmc_try(sc, ASMC_WRITE, "MOCN", buf, 2)))
+		printf("%s write MOCN failed (0x%x)\n",
+		    sc->sc_dev.dv_xname, r);
+	for (i = 0; i < ASMC_MAXMOTION; i++)
+		if ((r = asmc_motion(sc, i, 1)) && r != ASMC_NOTFOUND)
+			printf("%s: read motion %d failed (0x%x)\n",
+			    sc->sc_dev.dv_xname, i, r);
+#endif
+}
+
+void
+asmc_update(void *arg)
+{
+	struct asmc_softc *sc = arg;
+	int i;
+
+	for (i = 0; i < ASMC_MAXTEMP && sc->sc_prod->pr_temp[i]; i++)
+		if (!(sc->sc_sensor_temp[i].flags & SENSOR_FINVALID))
+			asmc_temp(sc, i, 0);
+	for (i = 0; i < sc->sc_nfans && i < ASMC_MAXFAN; i++)
+		if (!(sc->sc_sensor_fan[i].flags & SENSOR_FINVALID))
+			asmc_fan(sc, i, 0);
+	for (i = 0; i < ASMC_MAXLIGHT; i++)
+		if (!(sc->sc_sensor_light[i].flags & SENSOR_FINVALID))
+			asmc_light(sc, i, 0);
+#if 0
+	for (i = 0; i < ASMC_MAXMOTION; i++)
+		if (!(sc->sc_sensor_motion[i].flags & SENSOR_FINVALID))
+			asmc_motion(sc, i, 0);
+#endif
+}
diff --git a/sys/dev/acpi/files.acpi b/sys/dev/acpi/files.acpi
index e57c399385e..af128bf09c0 100644
--- a/sys/dev/acpi/files.acpi
+++ b/sys/dev/acpi/files.acpi
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.acpi,v 1.55 2020/06/02 16:24:24 jcs Exp $
+#	$OpenBSD: files.acpi,v 1.56 2020/09/12 07:47:26 mglocker Exp $
 #
 # Config file and device description for machine-independent ACPI code.
 # Included by ports that need it.
@@ -75,6 +75,11 @@ device	acpidock
 attach	acpidock at acpi
 file	dev/acpi/acpidock.c		acpidock
 
+# Apple System Management Controller (SMC)
+device	asmc
+attach	asmc at acpi
+file	dev/acpi/asmc.c			asmc
+
 # ASUS ACPI Hotkeys
 device	acpiasus
 attach	acpiasus at acpi