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thinkpad_acpi.c revision 1.12.2.1
      1 /* $NetBSD: thinkpad_acpi.c,v 1.12.2.1 2008/05/18 12:33:34 yamt Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007 Jared D. McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: thinkpad_acpi.c,v 1.12.2.1 2008/05/18 12:33:34 yamt Exp $");
     31 
     32 #include <sys/types.h>
     33 #include <sys/param.h>
     34 #include <sys/malloc.h>
     35 #include <sys/buf.h>
     36 #include <sys/callout.h>
     37 #include <sys/kernel.h>
     38 #include <sys/device.h>
     39 #include <sys/pmf.h>
     40 #include <sys/queue.h>
     41 #include <sys/kmem.h>
     42 
     43 #include <dev/acpi/acpivar.h>
     44 #include <dev/acpi/acpi_ecvar.h>
     45 
     46 #if defined(__i386__) || defined(__amd64__)
     47 #include <dev/isa/isareg.h>
     48 #include <machine/pio.h>
     49 #endif
     50 
     51 #define	THINKPAD_NSENSORS	8
     52 
     53 typedef struct thinkpad_softc {
     54 	device_t		sc_dev;
     55 	device_t		sc_ecdev;
     56 	struct acpi_devnode	*sc_node;
     57 	ACPI_HANDLE		sc_cmoshdl;
     58 	bool			sc_cmoshdl_valid;
     59 
     60 #define	TP_PSW_SLEEP		0
     61 #define	TP_PSW_HIBERNATE	1
     62 #define	TP_PSW_DISPLAY_CYCLE	2
     63 #define	TP_PSW_LOCK_SCREEN	3
     64 #define	TP_PSW_BATTERY_INFO	4
     65 #define	TP_PSW_EJECT_BUTTON	5
     66 #define	TP_PSW_ZOOM_BUTTON	6
     67 #define	TP_PSW_VENDOR_BUTTON	7
     68 #define	TP_PSW_LAST		8
     69 	struct sysmon_pswitch	sc_smpsw[TP_PSW_LAST];
     70 	bool			sc_smpsw_valid;
     71 
     72 	struct sysmon_envsys	*sc_sme;
     73 	envsys_data_t		sc_sensor[THINKPAD_NSENSORS];
     74 
     75 	int			sc_display_state;
     76 } thinkpad_softc_t;
     77 
     78 /* Hotkey events */
     79 #define	THINKPAD_NOTIFY_FnF1		0x001
     80 #define	THINKPAD_NOTIFY_LockScreen	0x002
     81 #define	THINKPAD_NOTIFY_BatteryInfo	0x003
     82 #define	THINKPAD_NOTIFY_SleepButton	0x004
     83 #define	THINKPAD_NOTIFY_WirelessSwitch	0x005
     84 #define	THINKPAD_NOTIFY_FnF6		0x006
     85 #define	THINKPAD_NOTIFY_DisplayCycle	0x007
     86 #define	THINKPAD_NOTIFY_PointerSwitch	0x008
     87 #define	THINKPAD_NOTIFY_EjectButton	0x009
     88 #define	THINKPAD_NOTIFY_FnF10		0x00a
     89 #define	THINKPAD_NOTIFY_FnF11		0x00b
     90 #define	THINKPAD_NOTIFY_HibernateButton	0x00c
     91 #define	THINKPAD_NOTIFY_BrightnessUp	0x010
     92 #define	THINKPAD_NOTIFY_BrightnessDown	0x011
     93 #define	THINKPAD_NOTIFY_ThinkLight	0x012
     94 #define	THINKPAD_NOTIFY_Zoom		0x014
     95 #define	THINKPAD_NOTIFY_ThinkVantage	0x018
     96 
     97 #define	THINKPAD_CMOS_BRIGHTNESS_UP	0x04
     98 #define	THINKPAD_CMOS_BRIGHTNESS_DOWN	0x05
     99 
    100 #define	THINKPAD_HKEY_VERSION		0x0100
    101 
    102 #define	THINKPAD_DISPLAY_LCD		0x01
    103 #define	THINKPAD_DISPLAY_CRT		0x02
    104 #define	THINKPAD_DISPLAY_DVI		0x08
    105 #define	THINKPAD_DISPLAY_ALL \
    106 	(THINKPAD_DISPLAY_LCD | THINKPAD_DISPLAY_CRT | THINKPAD_DISPLAY_DVI)
    107 
    108 static int	thinkpad_match(device_t, struct cfdata *, void *);
    109 static void	thinkpad_attach(device_t, device_t, void *);
    110 
    111 static ACPI_STATUS thinkpad_mask_init(thinkpad_softc_t *, uint32_t);
    112 static void	thinkpad_notify_handler(ACPI_HANDLE, UINT32, void *);
    113 static void	thinkpad_get_hotkeys(void *);
    114 
    115 static void	thinkpad_temp_init(thinkpad_softc_t *);
    116 static void	thinkpad_temp_refresh(struct sysmon_envsys *, envsys_data_t *);
    117 
    118 static void	thinkpad_wireless_toggle(thinkpad_softc_t *);
    119 
    120 static bool	thinkpad_resume(device_t PMF_FN_PROTO);
    121 static void	thinkpad_brightness_up(device_t);
    122 static void	thinkpad_brightness_down(device_t);
    123 static uint8_t	thinkpad_brightness_read(thinkpad_softc_t *sc);
    124 static void	thinkpad_cmos(thinkpad_softc_t *, uint8_t);
    125 
    126 CFATTACH_DECL_NEW(thinkpad, sizeof(thinkpad_softc_t),
    127     thinkpad_match, thinkpad_attach, NULL, NULL);
    128 
    129 static const char * const thinkpad_ids[] = {
    130 	"IBM0068",
    131 	NULL
    132 };
    133 
    134 static int
    135 thinkpad_match(device_t parent, struct cfdata *match, void *opaque)
    136 {
    137 	struct acpi_attach_args *aa = (struct acpi_attach_args *)opaque;
    138 	ACPI_HANDLE hdl;
    139 	ACPI_INTEGER ver;
    140 
    141 	if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE)
    142 		return 0;
    143 
    144 	if (!acpi_match_hid(aa->aa_node->ad_devinfo, thinkpad_ids))
    145 		return 0;
    146 
    147 	/* No point in attaching if we can't find the CMOS method */
    148 	if (ACPI_FAILURE(AcpiGetHandle(NULL, "\\UCMS", &hdl)))
    149 		return 0;
    150 
    151 	/* We only support hotkey version 0x0100 */
    152 	if (ACPI_FAILURE(acpi_eval_integer(aa->aa_node->ad_handle, "MHKV",
    153 	    &ver)))
    154 		return 0;
    155 
    156 	if (ver != THINKPAD_HKEY_VERSION)
    157 		return 0;
    158 
    159 	/* Cool, looks like we're good to go */
    160 	return 1;
    161 }
    162 
    163 static void
    164 thinkpad_attach(device_t parent, device_t self, void *opaque)
    165 {
    166 	thinkpad_softc_t *sc = device_private(self);
    167 	struct acpi_attach_args *aa = (struct acpi_attach_args *)opaque;
    168 	struct sysmon_pswitch *psw;
    169 	device_t curdev;
    170 	ACPI_STATUS rv;
    171 	ACPI_INTEGER val;
    172 	int i;
    173 
    174 	sc->sc_node = aa->aa_node;
    175 	sc->sc_dev = self;
    176 	sc->sc_display_state = THINKPAD_DISPLAY_LCD;
    177 
    178 	aprint_naive("\n");
    179 	aprint_normal("\n");
    180 
    181 	/* T61 uses \UCMS method for issuing CMOS commands */
    182 	rv = AcpiGetHandle(NULL, "\\UCMS", &sc->sc_cmoshdl);
    183 	if (ACPI_FAILURE(rv))
    184 		sc->sc_cmoshdl_valid = false;
    185 	else {
    186 		aprint_verbose_dev(self, "using CMOS at \\UCMS\n");
    187 		sc->sc_cmoshdl_valid = true;
    188 	}
    189 
    190 	sc->sc_ecdev = NULL;
    191 	TAILQ_FOREACH(curdev, &alldevs, dv_list)
    192 		if (device_is_a(curdev, "acpiecdt") ||
    193 		    device_is_a(curdev, "acpiec")) {
    194 			sc->sc_ecdev = curdev;
    195 			break;
    196 		}
    197 	if (sc->sc_ecdev)
    198 		aprint_verbose_dev(self, "using EC at %s\n",
    199 		    device_xname(sc->sc_ecdev));
    200 
    201 	/* Get the supported event mask */
    202 	rv = acpi_eval_integer(sc->sc_node->ad_handle, "MHKA", &val);
    203 	if (ACPI_FAILURE(rv)) {
    204 		aprint_error_dev(self, "couldn't evaluate MHKA: %s\n",
    205 		    AcpiFormatException(rv));
    206 		goto fail;
    207 	}
    208 
    209 	/* Enable all supported events */
    210 	rv = thinkpad_mask_init(sc, val);
    211 	if (ACPI_FAILURE(rv)) {
    212 		aprint_error_dev(self, "couldn't set event mask: %s\n",
    213 		    AcpiFormatException(rv));
    214 		goto fail;
    215 	}
    216 
    217 	/* Install notify handler for events */
    218 	rv = AcpiInstallNotifyHandler(sc->sc_node->ad_handle,
    219 	    ACPI_DEVICE_NOTIFY, thinkpad_notify_handler, sc);
    220 	if (ACPI_FAILURE(rv))
    221 		aprint_error_dev(self, "couldn't install notify handler: %s\n",
    222 		    AcpiFormatException(rv));
    223 
    224 	/* Register power switches with sysmon */
    225 	psw = sc->sc_smpsw;
    226 	sc->sc_smpsw_valid = true;
    227 
    228 	psw[TP_PSW_SLEEP].smpsw_name = device_xname(self);
    229 	psw[TP_PSW_SLEEP].smpsw_type = PSWITCH_TYPE_SLEEP;
    230 #if notyet
    231 	psw[TP_PSW_HIBERNATE].smpsw_name = device_xname(self);
    232 	mpsw[TP_PSW_HIBERNATE].smpsw_type = PSWITCH_TYPE_HIBERNATE;
    233 #endif
    234 	for (i = TP_PSW_DISPLAY_CYCLE; i < TP_PSW_LAST; i++)
    235 		sc->sc_smpsw[i].smpsw_type = PSWITCH_TYPE_HOTKEY;
    236 	psw[TP_PSW_DISPLAY_CYCLE].smpsw_name = PSWITCH_HK_DISPLAY_CYCLE;
    237 	psw[TP_PSW_LOCK_SCREEN].smpsw_name = PSWITCH_HK_LOCK_SCREEN;
    238 	psw[TP_PSW_BATTERY_INFO].smpsw_name = PSWITCH_HK_BATTERY_INFO;
    239 	psw[TP_PSW_EJECT_BUTTON].smpsw_name = PSWITCH_HK_EJECT_BUTTON;
    240 	psw[TP_PSW_ZOOM_BUTTON].smpsw_name = PSWITCH_HK_ZOOM_BUTTON;
    241 	psw[TP_PSW_VENDOR_BUTTON].smpsw_name = PSWITCH_HK_VENDOR_BUTTON;
    242 
    243 	for (i = 0; i < TP_PSW_LAST; i++) {
    244 		/* not supported yet */
    245 		if (i == TP_PSW_HIBERNATE)
    246 			continue;
    247 		if (sysmon_pswitch_register(&sc->sc_smpsw[i]) != 0) {
    248 			aprint_error_dev(self,
    249 			    "couldn't register with sysmon\n");
    250 			sc->sc_smpsw_valid = false;
    251 			break;
    252 		}
    253 	}
    254 
    255 	/* Register temperature sensors with envsys */
    256 	thinkpad_temp_init(sc);
    257 
    258 fail:
    259 	if (!pmf_device_register(self, NULL, thinkpad_resume))
    260 		aprint_error_dev(self, "couldn't establish power handler\n");
    261 	if (!pmf_event_register(self, PMFE_DISPLAY_BRIGHTNESS_UP,
    262 	    thinkpad_brightness_up, true))
    263 		aprint_error_dev(self, "couldn't register event handler\n");
    264 	if (!pmf_event_register(self, PMFE_DISPLAY_BRIGHTNESS_DOWN,
    265 	    thinkpad_brightness_down, true))
    266 		aprint_error_dev(self, "couldn't register event handler\n");
    267 }
    268 
    269 static void
    270 thinkpad_notify_handler(ACPI_HANDLE hdl, UINT32 notify, void *opaque)
    271 {
    272 	thinkpad_softc_t *sc = (thinkpad_softc_t *)opaque;
    273 	device_t self = sc->sc_dev;
    274 	ACPI_STATUS rv;
    275 
    276 	if (notify != 0x80) {
    277 		aprint_debug_dev(self, "unknown notify 0x%02x\n", notify);
    278 		return;
    279 	}
    280 
    281 	rv = AcpiOsExecute(OSL_NOTIFY_HANDLER, thinkpad_get_hotkeys, sc);
    282 	if (ACPI_FAILURE(rv))
    283 		aprint_error_dev(self, "couldn't queue hotkey handler: %s\n",
    284 		    AcpiFormatException(rv));
    285 }
    286 
    287 static void
    288 thinkpad_get_hotkeys(void *opaque)
    289 {
    290 	thinkpad_softc_t *sc = (thinkpad_softc_t *)opaque;
    291 	device_t self = sc->sc_dev;
    292 	ACPI_STATUS rv;
    293 	ACPI_INTEGER val;
    294 	int type, event;
    295 
    296 	for (;;) {
    297 		rv = acpi_eval_integer(sc->sc_node->ad_handle, "MHKP", &val);
    298 		if (ACPI_FAILURE(rv)) {
    299 			aprint_error_dev(self, "couldn't evaluate MHKP: %s\n",
    300 			    AcpiFormatException(rv));
    301 			return;
    302 		}
    303 
    304 		if (val == 0)
    305 			return;
    306 
    307 		type = (val & 0xf000) >> 12;
    308 		event = val & 0x0fff;
    309 
    310 		if (type != 1)
    311 			/* Only type 1 events are supported for now */
    312 			continue;
    313 
    314 		switch (event) {
    315 		case THINKPAD_NOTIFY_BrightnessUp:
    316 			thinkpad_brightness_up(self);
    317 			break;
    318 		case THINKPAD_NOTIFY_BrightnessDown:
    319 			thinkpad_brightness_down(self);
    320 			break;
    321 		case THINKPAD_NOTIFY_WirelessSwitch:
    322 			thinkpad_wireless_toggle(sc);
    323 			break;
    324 		case THINKPAD_NOTIFY_SleepButton:
    325 			if (sc->sc_smpsw_valid == false)
    326 				break;
    327 			sysmon_pswitch_event(&sc->sc_smpsw[TP_PSW_SLEEP],
    328 			    PSWITCH_EVENT_PRESSED);
    329 			break;
    330 		case THINKPAD_NOTIFY_HibernateButton:
    331 #if notyet
    332 			if (sc->sc_smpsw_valid == false)
    333 				break;
    334 			sysmon_pswitch_event(&sc->sc_smpsw[TP_PSW_HIBERNATE],
    335 			    PSWITCH_EVENT_PRESSED);
    336 #endif
    337 			break;
    338 		case THINKPAD_NOTIFY_DisplayCycle:
    339 			if (sc->sc_smpsw_valid == false)
    340 				break;
    341 			sysmon_pswitch_event(
    342 			    &sc->sc_smpsw[TP_PSW_DISPLAY_CYCLE],
    343 			    PSWITCH_EVENT_PRESSED);
    344 			break;
    345 		case THINKPAD_NOTIFY_LockScreen:
    346 			if (sc->sc_smpsw_valid == false)
    347 				break;
    348 			sysmon_pswitch_event(
    349 			    &sc->sc_smpsw[TP_PSW_LOCK_SCREEN],
    350 			    PSWITCH_EVENT_PRESSED);
    351 			break;
    352 		case THINKPAD_NOTIFY_BatteryInfo:
    353 			if (sc->sc_smpsw_valid == false)
    354 				break;
    355 			sysmon_pswitch_event(
    356 			    &sc->sc_smpsw[TP_PSW_BATTERY_INFO],
    357 			    PSWITCH_EVENT_PRESSED);
    358 			break;
    359 		case THINKPAD_NOTIFY_EjectButton:
    360 			if (sc->sc_smpsw_valid == false)
    361 				break;
    362 			sysmon_pswitch_event(
    363 			    &sc->sc_smpsw[TP_PSW_EJECT_BUTTON],
    364 			    PSWITCH_EVENT_PRESSED);
    365 			break;
    366 		case THINKPAD_NOTIFY_Zoom:
    367 			if (sc->sc_smpsw_valid == false)
    368 				break;
    369 			sysmon_pswitch_event(
    370 			    &sc->sc_smpsw[TP_PSW_ZOOM_BUTTON],
    371 			    PSWITCH_EVENT_PRESSED);
    372 			break;
    373 		case THINKPAD_NOTIFY_ThinkVantage:
    374 			if (sc->sc_smpsw_valid == false)
    375 				break;
    376 			sysmon_pswitch_event(
    377 			    &sc->sc_smpsw[TP_PSW_VENDOR_BUTTON],
    378 			    PSWITCH_EVENT_PRESSED);
    379 			break;
    380 		case THINKPAD_NOTIFY_FnF1:
    381 		case THINKPAD_NOTIFY_FnF6:
    382 		case THINKPAD_NOTIFY_PointerSwitch:
    383 		case THINKPAD_NOTIFY_FnF10:
    384 		case THINKPAD_NOTIFY_FnF11:
    385 		case THINKPAD_NOTIFY_ThinkLight:
    386 			/* XXXJDM we should deliver hotkeys as keycodes */
    387 			break;
    388 		default:
    389 			aprint_debug_dev(self, "notify event 0x%03x\n", event);
    390 			break;
    391 		}
    392 	}
    393 }
    394 
    395 static ACPI_STATUS
    396 thinkpad_mask_init(thinkpad_softc_t *sc, uint32_t mask)
    397 {
    398 	ACPI_OBJECT param[2];
    399 	ACPI_OBJECT_LIST params;
    400 	ACPI_STATUS rv;
    401 	int i;
    402 
    403 	/* Update hotkey mask */
    404 	params.Count = 2;
    405 	params.Pointer = param;
    406 	param[0].Type = param[1].Type = ACPI_TYPE_INTEGER;
    407 
    408 	for (i = 0; i < 32; i++) {
    409 		param[0].Integer.Value = i + 1;
    410 		param[1].Integer.Value = (((1 << i) & mask) != 0);
    411 
    412 		rv = AcpiEvaluateObject(sc->sc_node->ad_handle, "MHKM",
    413 		    &params, NULL);
    414 		if (ACPI_FAILURE(rv))
    415 			return rv;
    416 	}
    417 
    418 	/* Enable hotkey events */
    419 	params.Count = 1;
    420 	param[0].Integer.Value = 1;
    421 	rv = AcpiEvaluateObject(sc->sc_node->ad_handle, "MHKC", &params, NULL);
    422 	if (ACPI_FAILURE(rv)) {
    423 		aprint_error_dev(sc->sc_dev, "couldn't enable hotkeys: %s\n",
    424 		    AcpiFormatException(rv));
    425 		return rv;
    426 	}
    427 
    428 	/* Claim ownership of brightness control */
    429 	param[0].Integer.Value = 0;
    430 	(void)AcpiEvaluateObject(sc->sc_node->ad_handle, "PWMS", &params, NULL);
    431 
    432 	return AE_OK;
    433 }
    434 
    435 static void
    436 thinkpad_temp_init(thinkpad_softc_t *sc)
    437 {
    438 	char sname[5] = "TMP?";
    439 	int i, err;
    440 
    441 	if (sc->sc_ecdev == NULL)
    442 		return;	/* no chance of this working */
    443 
    444 	sc->sc_sme = sysmon_envsys_create();
    445 	for (i = 0; i < THINKPAD_NSENSORS; i++) {
    446 		sname[3] = '0' + i;
    447 		strcpy(sc->sc_sensor[i].desc, sname);
    448 		sc->sc_sensor[i].units = ENVSYS_STEMP;
    449 
    450 		if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor[i]))
    451 			aprint_error_dev(sc->sc_dev,
    452 			    "couldn't attach sensor %s\n", sname);
    453 	}
    454 
    455 	sc->sc_sme->sme_name = device_xname(sc->sc_dev);
    456 	sc->sc_sme->sme_cookie = sc;
    457 	sc->sc_sme->sme_refresh = thinkpad_temp_refresh;
    458 
    459 	err = sysmon_envsys_register(sc->sc_sme);
    460 	if (err) {
    461 		aprint_error_dev(sc->sc_dev,
    462 		    "couldn't register with sysmon: %d\n", err);
    463 		sysmon_envsys_destroy(sc->sc_sme);
    464 	}
    465 }
    466 
    467 static void
    468 thinkpad_temp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
    469 {
    470 	thinkpad_softc_t *sc = sme->sme_cookie;
    471 	char sname[5] = "TMP?";
    472 	ACPI_INTEGER val;
    473 	ACPI_STATUS rv;
    474 	int temp;
    475 
    476 	sname[3] = '0' + edata->sensor;
    477 	rv = acpi_eval_integer(acpiec_get_handle(sc->sc_ecdev), sname, &val);
    478 	if (ACPI_FAILURE(rv)) {
    479 		edata->state = ENVSYS_SINVALID;
    480 		return;
    481 	}
    482 	temp = (int)val;
    483 	if (temp > 127 || temp < -127) {
    484 		edata->state = ENVSYS_SINVALID;
    485 		return;
    486 	}
    487 
    488 	edata->value_cur = temp * 1000000 + 273150000;
    489 	edata->state = ENVSYS_SVALID;
    490 }
    491 
    492 static void
    493 thinkpad_wireless_toggle(thinkpad_softc_t *sc)
    494 {
    495 	/* Ignore return value, as the hardware may not support bluetooth */
    496 	(void)AcpiEvaluateObject(sc->sc_node->ad_handle, "BTGL", NULL, NULL);
    497 }
    498 
    499 static uint8_t
    500 thinkpad_brightness_read(thinkpad_softc_t *sc)
    501 {
    502 #if defined(__i386__) || defined(__amd64__)
    503 	/*
    504 	 * We have two ways to get the current brightness -- either via
    505 	 * magic RTC registers, or using the EC. Since I don't dare mess
    506 	 * with the EC, and Thinkpads are x86-only, this will have to do
    507 	 * for now.
    508 	 */
    509 	outb(IO_RTC, 0x6c);
    510 	return inb(IO_RTC+1) & 7;
    511 #else
    512 	return 0;
    513 #endif
    514 }
    515 
    516 static void
    517 thinkpad_brightness_up(device_t self)
    518 {
    519 	thinkpad_softc_t *sc = device_private(self);
    520 
    521 	if (thinkpad_brightness_read(sc) == 7)
    522 		return;
    523 	thinkpad_cmos(sc, THINKPAD_CMOS_BRIGHTNESS_UP);
    524 }
    525 
    526 static void
    527 thinkpad_brightness_down(device_t self)
    528 {
    529 	thinkpad_softc_t *sc = device_private(self);
    530 
    531 	if (thinkpad_brightness_read(sc) == 0)
    532 		return;
    533 	thinkpad_cmos(sc, THINKPAD_CMOS_BRIGHTNESS_DOWN);
    534 }
    535 
    536 static void
    537 thinkpad_cmos(thinkpad_softc_t *sc, uint8_t cmd)
    538 {
    539 	ACPI_OBJECT param;
    540 	ACPI_OBJECT_LIST params;
    541 	ACPI_STATUS rv;
    542 
    543 	if (sc->sc_cmoshdl_valid == false)
    544 		return;
    545 
    546 	params.Count = 1;
    547 	params.Pointer = &param;
    548 	param.Type = ACPI_TYPE_INTEGER;
    549 	param.Integer.Value = cmd;
    550 	rv = AcpiEvaluateObject(sc->sc_cmoshdl, NULL, &params, NULL);
    551 	if (ACPI_FAILURE(rv))
    552 		aprint_error_dev(sc->sc_dev, "couldn't evalute CMOS: %s\n",
    553 		    AcpiFormatException(rv));
    554 }
    555 
    556 static bool
    557 thinkpad_resume(device_t dv PMF_FN_ARGS)
    558 {
    559 	ACPI_STATUS rv;
    560 	ACPI_HANDLE pubs;
    561 
    562 	rv = AcpiGetHandle(NULL, "\\_SB.PCI0.LPC.EC.PUBS", &pubs);
    563 	if (ACPI_FAILURE(rv))
    564 		return true;	/* not fatal */
    565 
    566 	rv = AcpiEvaluateObject(pubs, "_ON", NULL, NULL);
    567 	if (ACPI_FAILURE(rv))
    568 		aprint_error_dev(dv, "failed to execute PUBS._ON: %s\n",
    569 		    AcpiFormatException(rv));
    570 
    571 	return true;
    572 }
    573