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acpi_pmtr.c revision 1.2 
      1 /*	$NetBSD: acpi_pmtr.c,v 1.2 2011/02/14 18:51:44 jruoho Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2011 Jukka Ruohonen <jruohonen (at) iki.fi>
      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  *
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: acpi_pmtr.c,v 1.2 2011/02/14 18:51:44 jruoho Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/module.h>
     34 
     35 #include <dev/acpi/acpireg.h>
     36 #include <dev/acpi/acpivar.h>
     37 
     38 #include <dev/sysmon/sysmonvar.h>
     39 
     40 #define _COMPONENT			ACPI_RESOURCE_COMPONENT
     41 ACPI_MODULE_NAME			("acpi_pmtr")
     42 
     43 #define ACPIPMTR_CAP_FLAGS		0
     44 #define ACPIPMTR_CAP_UNIT		1
     45 #define ACPIPMTR_CAP_TYPE		2
     46 #define ACPIPMTR_CAP_ACCURACY		3
     47 #define ACPIPMTR_CAP_SAMPLING		4
     48 #define ACPIPMTR_CAP_IVAL_MIN		5
     49 #define ACPIPMTR_CAP_IVAL_MAX		6
     50 #define ACPIPMTR_CAP_HYSTERESIS		7
     51 #define ACPIPMTR_CAP_HWLIMIT		8
     52 #define ACPIPMTR_CAP_HWLIMIT_MIN	9
     53 #define ACPIPMTR_CAP_HWLIMIT_MAX	10
     54 #define ACPIPMTR_CAP_COUNT		11
     55 /*      ACPIPMTR_CAP_MODEL		11 */
     56 /*      ACPIPMTR_CAP_SERIAL		12 */
     57 /*      ACPIPMTR_CAP_OEM		13 */
     58 
     59 #define ACPIPMTR_FLAGS_MEASURE		__BIT(0)
     60 #define ACPIPMTR_FLAGS_TRIP		__BIT(1)
     61 #define ACPIPMTR_FLAGS_HWLIMIT		__BIT(2)
     62 #define ACPIPMTR_FLAGS_NOTIFY		__BIT(3)
     63 #define ACPIPMTR_FLAGS_DISCHARGE	__BIT(8)
     64 
     65 #define ACPIPMTR_POWER_INPUT		0x00
     66 #define ACPIPMTR_POWER_OUTPUT		0x01
     67 
     68 #define ACPIPMTR_NOTIFY_CAP		0x80
     69 #define ACPIPMTR_NOTIFY_TRIP		0x81
     70 #define ACPIPMTR_NOTIFY_HWLIMIT1	0x82
     71 #define ACPIPMTR_NOTIFY_HWLIMIT2	0x83
     72 #define ACPIPMTR_NOTIFY_INTERVAL	0x84
     73 
     74 struct acpipmtr_softc {
     75 	device_t		 sc_dev;
     76 	struct acpi_devnode	*sc_node;
     77 	struct sysmon_envsys	*sc_sme;
     78 	envsys_data_t		 sc_sensor_i;
     79 	envsys_data_t		 sc_sensor_o;
     80 	uint32_t		 sc_cap[ACPIPMTR_CAP_COUNT];
     81 	int32_t			 sc_interval;
     82 };
     83 
     84 const char * const acpi_pmtr_ids[] = {
     85 	"ACPI000D",
     86 	NULL
     87 };
     88 
     89 static int	acpipmtr_match(device_t, cfdata_t, void *);
     90 static void	acpipmtr_attach(device_t, device_t, void *);
     91 static int	acpipmtr_detach(device_t, int);
     92 static bool	acpipmtr_cap_get(device_t, bool);
     93 static bool	acpipmtr_dev_print(device_t);
     94 static bool	acpipmtr_sensor_init(device_t);
     95 static void	acpipmtr_sensor_type(device_t);
     96 static int32_t	acpipmtr_sensor_get(device_t, const char *);
     97 static int32_t	acpipmtr_sensor_get_reading(device_t);
     98 static int32_t	acpipmtr_sensor_get_interval(device_t);
     99 static void	acpipmtr_sensor_refresh(struct sysmon_envsys*,envsys_data_t *);
    100 static void	acpipmtr_notify(ACPI_HANDLE, uint32_t, void *);
    101 
    102 CFATTACH_DECL_NEW(acpipmtr, sizeof(struct acpipmtr_softc),
    103     acpipmtr_match, acpipmtr_attach, acpipmtr_detach, NULL);
    104 
    105 static int
    106 acpipmtr_match(device_t parent, cfdata_t match, void *aux)
    107 {
    108 	struct acpi_attach_args *aa = aux;
    109 
    110 	if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE)
    111 		return 0;
    112 
    113 	return acpi_match_hid(aa->aa_node->ad_devinfo, acpi_pmtr_ids);
    114 }
    115 
    116 static void
    117 acpipmtr_attach(device_t parent, device_t self, void *aux)
    118 {
    119 	struct acpipmtr_softc *sc = device_private(self);
    120 	struct acpi_attach_args *aa = aux;
    121 	uint32_t acc;
    122 
    123 	sc->sc_sme = NULL;
    124 	sc->sc_dev = self;
    125 	sc->sc_node = aa->aa_node;
    126 
    127 	aprint_naive("\n");
    128 	aprint_normal(": ACPI Power Meter\n");
    129 
    130 	(void)pmf_device_register(self, NULL, NULL);
    131 
    132 	if (acpipmtr_cap_get(self, true) != true)
    133 		return;
    134 
    135 	if (acpipmtr_sensor_init(self) != true)
    136 		return;
    137 
    138 	(void)acpipmtr_dev_print(self);
    139 	(void)acpi_register_notify(sc->sc_node, acpipmtr_notify);
    140 
    141 	if ((acc = sc->sc_cap[ACPIPMTR_CAP_ACCURACY]) == 0)
    142 		acc = 100000;
    143 
    144 	aprint_verbose_dev(self,
    145 	    "measuring %s power at %u.%u %% accuracy, %u ms sampling\n",
    146 	    (sc->sc_cap[ACPIPMTR_CAP_TYPE] != 0) ? "output" : "input",
    147 	    acc / 1000, acc % 1000, sc->sc_cap[ACPIPMTR_CAP_SAMPLING]);
    148 
    149 	aprint_debug_dev(self, "%s hw-limits, capabilities 0x%02x\n",
    150 	    (sc->sc_cap[ACPIPMTR_CAP_HWLIMIT] != 0) ? "rw" : "ro",
    151 	     sc->sc_cap[ACPIPMTR_CAP_FLAGS]);
    152 }
    153 
    154 static int
    155 acpipmtr_detach(device_t self, int flags)
    156 {
    157 	struct acpipmtr_softc *sc = device_private(self);
    158 
    159 	pmf_device_deregister(self);
    160 	acpi_deregister_notify(sc->sc_node);
    161 
    162 	if (sc->sc_sme != NULL)
    163 		sysmon_envsys_unregister(sc->sc_sme);
    164 
    165 	return 0;
    166 }
    167 
    168 static bool
    169 acpipmtr_cap_get(device_t self, bool print)
    170 {
    171 	struct acpipmtr_softc *sc = device_private(self);
    172 	ACPI_OBJECT *elm, *obj;
    173 	ACPI_BUFFER buf;
    174 	ACPI_STATUS rv;
    175 	uint32_t i;
    176 
    177 	for (i = 0; i < __arraycount(sc->sc_cap); i++)
    178 		sc->sc_cap[i] = 0;
    179 
    180 	rv = acpi_eval_struct(sc->sc_node->ad_handle, "_PMC", &buf);
    181 
    182 	if (ACPI_FAILURE(rv))
    183 		goto out;
    184 
    185 	obj = buf.Pointer;
    186 
    187 	if (obj->Type != ACPI_TYPE_PACKAGE) {
    188 		rv = AE_TYPE;
    189 		goto out;
    190 	}
    191 
    192 	elm = obj->Package.Elements;
    193 
    194 	if (obj->Package.Count != 14) {
    195 		rv = AE_LIMIT;
    196 		goto out;
    197 	}
    198 
    199 	CTASSERT(__arraycount(sc->sc_cap) == 11);
    200 
    201 	for (i = 0; i < __arraycount(sc->sc_cap); i++) {
    202 
    203 		if (elm[i].Type != ACPI_TYPE_INTEGER) {
    204 			rv = AE_TYPE;
    205 			goto out;
    206 		}
    207 
    208 		if (elm[i].Integer.Value > UINT32_MAX) {
    209 			rv = AE_AML_NUMERIC_OVERFLOW;
    210 			goto out;
    211 		}
    212 
    213 		sc->sc_cap[i] = elm[i].Integer.Value;
    214 	}
    215 
    216 	if (print != true)
    217 		goto out;
    218 
    219 	for (; i < 14; i++) {
    220 
    221 		if (elm[i].Type != ACPI_TYPE_STRING)
    222 			goto out;
    223 
    224 		if (elm[i].String.Pointer == NULL)
    225 			goto out;
    226 
    227 		if (elm[i].String.Pointer[0] == '\0')
    228 			goto out;
    229 	}
    230 
    231 	aprint_debug_dev(self, "%s, serial %s, "
    232 	    "model %s\n", elm[13].String.Pointer,
    233 	    elm[12].String.Pointer, elm[11].String.Pointer);
    234 
    235 out:
    236 	if (ACPI_FAILURE(rv))
    237 		aprint_error_dev(self, "failed to evaluate _PMC: %s\n",
    238 		    AcpiFormatException(rv));
    239 
    240 	if (buf.Pointer != NULL)
    241 		ACPI_FREE(buf.Pointer);
    242 
    243 	return (rv != AE_OK) ? false : true;
    244 }
    245 
    246 static bool
    247 acpipmtr_dev_print(device_t self)
    248 {
    249 	struct acpipmtr_softc *sc = device_private(self);
    250 	struct acpi_devnode *ad;
    251 	ACPI_OBJECT *elm, *obj;
    252 	ACPI_BUFFER buf;
    253 	ACPI_HANDLE hdl;
    254 	ACPI_STATUS rv;
    255 	uint32_t i, n;
    256 
    257 	/*
    258 	 * The _PMD method returns a package of devices whose total power
    259 	 * drawn should roughly correspond with the readings from the meter.
    260 	 */
    261 	rv = acpi_eval_struct(sc->sc_node->ad_handle, "_PMD", &buf);
    262 
    263 	if (ACPI_FAILURE(rv))
    264 		goto out;
    265 
    266 	obj = buf.Pointer;
    267 
    268 	if (obj->Type != ACPI_TYPE_PACKAGE) {
    269 		rv = AE_TYPE;
    270 		goto out;
    271 	}
    272 
    273 	n = obj->Package.Count;
    274 
    275 	if (n == 0) {
    276 		rv = AE_LIMIT;
    277 		goto out;
    278 	}
    279 
    280 	aprint_debug_dev(self, "measured devices: ");
    281 
    282 	for (i = 0; i < n; i++) {
    283 
    284 		elm = &obj->Package.Elements[i];
    285 		rv = acpi_eval_reference_handle(elm, &hdl);
    286 
    287 		if (ACPI_FAILURE(rv))
    288 			continue;
    289 
    290 		ad = acpi_get_node(hdl);
    291 
    292 		if (ad == NULL)
    293 			continue;
    294 
    295 		aprint_debug("%s ", ad->ad_name);
    296 	}
    297 
    298 	aprint_debug("\n");
    299 
    300 out:
    301 	if (ACPI_FAILURE(rv))
    302 		aprint_debug_dev(self, "failed to evaluate _PMD: %s\n",
    303 		    AcpiFormatException(rv));
    304 
    305 	if (buf.Pointer != NULL)
    306 		ACPI_FREE(buf.Pointer);
    307 
    308 	return (rv != AE_OK) ? false : true;
    309 }
    310 
    311 static bool
    312 acpipmtr_sensor_init(device_t self)
    313 {
    314 	struct acpipmtr_softc *sc = device_private(self);
    315 	const size_t siz = sizeof(sc->sc_sensor_i.desc);
    316 	int32_t val;
    317 
    318 	val = acpipmtr_sensor_get_reading(self);
    319 	sc->sc_interval = acpipmtr_sensor_get_interval(self);
    320 
    321 	if (val < 0) {
    322 		aprint_error_dev(self, "failed to get sensor reading\n");
    323 		return false;
    324 	}
    325 
    326 	/* Always mW in ACPI 4.0. */
    327 	if (sc->sc_cap[ACPIPMTR_CAP_UNIT] != 0)
    328 		aprint_error_dev(self, "invalid measurement unit\n");
    329 
    330 	sc->sc_sme = sysmon_envsys_create();
    331 
    332 	sc->sc_sensor_i.units = ENVSYS_SWATTS;
    333 	sc->sc_sensor_o.units = ENVSYS_SWATTS;
    334 	sc->sc_sensor_i.value_cur = val * 1000;
    335 	sc->sc_sensor_o.value_cur = val * 1000;
    336 
    337 	acpipmtr_sensor_type(self);
    338 
    339 	(void)strlcpy(sc->sc_sensor_i.desc, "input power", siz);
    340 	(void)strlcpy(sc->sc_sensor_o.desc, "output power", siz);
    341 
    342 	sc->sc_sme->sme_cookie = self;
    343 	sc->sc_sme->sme_flags = SME_POLL_ONLY;
    344 	sc->sc_sme->sme_name = device_xname(self);
    345 	sc->sc_sme->sme_refresh = acpipmtr_sensor_refresh;
    346 
    347 	if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_i) != 0)
    348 		goto fail;
    349 
    350 	if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_o) != 0)
    351 		goto fail;
    352 
    353 	if (sysmon_envsys_register(sc->sc_sme) != 0)
    354 		goto fail;
    355 
    356 	return true;
    357 
    358 fail:
    359 	aprint_error_dev(self, "failed to initialize sysmon\n");
    360 
    361 	sysmon_envsys_destroy(sc->sc_sme);
    362 	sc->sc_sme = NULL;
    363 
    364 	return false;
    365 }
    366 
    367 static void
    368 acpipmtr_sensor_type(device_t self)
    369 {
    370 	struct acpipmtr_softc *sc = device_private(self);
    371 
    372 	switch (sc->sc_cap[ACPIPMTR_CAP_TYPE]) {
    373 
    374 	case ACPIPMTR_POWER_INPUT:
    375 		sc->sc_sensor_i.state = ENVSYS_SVALID;
    376 		sc->sc_sensor_o.state = ENVSYS_SINVALID;
    377 		break;
    378 
    379 	case ACPIPMTR_POWER_OUTPUT:
    380 		sc->sc_sensor_i.state = ENVSYS_SINVALID;
    381 		sc->sc_sensor_o.state = ENVSYS_SVALID;
    382 		break;
    383 
    384 	default:
    385 		sc->sc_sensor_i.state = ENVSYS_SINVALID;
    386 		sc->sc_sensor_o.state = ENVSYS_SINVALID;
    387 		break;
    388 	}
    389 }
    390 
    391 static int32_t
    392 acpipmtr_sensor_get(device_t self, const char *path)
    393 {
    394 	struct acpipmtr_softc *sc = device_private(self);
    395 	ACPI_INTEGER val = 0;
    396 	ACPI_STATUS rv;
    397 
    398 	rv = acpi_eval_integer(sc->sc_node->ad_handle, path, &val);
    399 
    400 	if (ACPI_FAILURE(rv))
    401 		goto fail;
    402 
    403 	if (val == 0 || val > INT32_MAX) {
    404 		rv = AE_LIMIT;
    405 		goto fail;
    406 	}
    407 
    408 	return val;
    409 
    410 fail:
    411 	aprint_debug_dev(self, "failed to evaluate "
    412 	    "%s: %s\n", path, AcpiFormatException(rv));
    413 
    414 	return -1;
    415 }
    416 
    417 static int32_t
    418 acpipmtr_sensor_get_reading(device_t self)
    419 {
    420 	return acpipmtr_sensor_get(self, "_PMM");
    421 }
    422 
    423 static int32_t
    424 acpipmtr_sensor_get_interval(device_t self)
    425 {
    426 	return acpipmtr_sensor_get(self, "_GAI");
    427 }
    428 
    429 static void
    430 acpipmtr_sensor_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
    431 {
    432 	device_t self = sme->sme_cookie;
    433 	struct acpipmtr_softc *sc;
    434 	int32_t val;
    435 
    436 	sc = device_private(self);
    437 
    438 	sc->sc_sensor_i.state = ENVSYS_SINVALID;
    439 	sc->sc_sensor_o.state = ENVSYS_SINVALID;
    440 
    441 	val = acpipmtr_sensor_get_reading(self) * 1000;
    442 
    443 	if (val < 0)
    444 		return;
    445 
    446 	sc->sc_sensor_i.value_cur = val;
    447 	sc->sc_sensor_o.value_cur = val;
    448 
    449 	acpipmtr_sensor_type(self);
    450 }
    451 
    452 static void
    453 acpipmtr_notify(ACPI_HANDLE hdl, uint32_t evt, void *aux)
    454 {
    455 	struct acpipmtr_softc *sc;
    456 	device_t self = aux;
    457 	int32_t val;
    458 
    459 	sc = device_private(self);
    460 
    461 	switch (evt) {
    462 
    463 	case ACPIPMTR_NOTIFY_CAP:
    464 
    465 		if (acpipmtr_cap_get(self, false) != true)
    466 			break;
    467 
    468 		acpipmtr_sensor_type(self);
    469 		break;
    470 
    471 	case ACPIPMTR_NOTIFY_INTERVAL:
    472 		val = acpipmtr_sensor_get_interval(self);
    473 
    474 		if (val < 0 || val == sc->sc_interval)
    475 			break;
    476 
    477 		aprint_debug_dev(self, "averaging interval changed "
    478 		    "from %u ms to %u ms\n", sc->sc_interval, val);
    479 
    480 		sc->sc_interval = val;
    481 		break;
    482 
    483 	case ACPIPMTR_NOTIFY_TRIP:	/* AE_SUPPORT */
    484 	case ACPIPMTR_NOTIFY_HWLIMIT1:	/* AE_SUPPORT */
    485 	case ACPIPMTR_NOTIFY_HWLIMIT2:	/* AE_SUPPORT */
    486 		break;
    487 
    488 	default:
    489 		aprint_debug_dev(self, "unknown notify 0x%02x\n", evt);
    490 	}
    491 }
    492 
    493 #ifdef _MODULE
    494 
    495 MODULE(MODULE_CLASS_DRIVER, acpipmtr, NULL);
    496 
    497 #include "ioconf.c"
    498 
    499 static int
    500 acpipmtr_modcmd(modcmd_t cmd, void *context)
    501 {
    502 
    503 	switch (cmd) {
    504 
    505 	case MODULE_CMD_INIT:
    506 		return config_init_component(cfdriver_ioconf_acpipmtr,
    507 		    cfattach_ioconf_acpipmtr, cfdata_ioconf_acpipmtr);
    508 
    509 	case MODULE_CMD_FINI:
    510 		return config_fini_component(cfdriver_ioconf_acpipmtr,
    511 		    cfattach_ioconf_acpipmtr, cfdata_ioconf_acpipmtr);
    512 
    513 	default:
    514 		return ENOTTY;
    515 	}
    516 }
    517 
    518 #endif	/* _MODULE */
    519