xref: /freebsd/sys/dev/acpica/acpi_smbat.c (revision f7c32ed617858bcd22f8d1b03199099d50125721) 
1 /*-
2  * Copyright (c) 2005 Hans Petter Selasky
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include "opt_acpi.h"
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/bus.h>
35 
36 #include <contrib/dev/acpica/include/acpi.h>
37 
38 #include <dev/acpica/acpivar.h>
39 #include <dev/acpica/acpiio.h>
40 #include <dev/acpica/acpi_smbus.h>
41 
42 /* Transactions have failed after 500 ms. */
43 #define SMBUS_TIMEOUT	50
44 
45 struct acpi_smbat_softc {
46 	uint8_t		sb_base_addr;
47 	device_t	ec_dev;
48 
49 	struct acpi_bix	bix;
50 	struct acpi_bst	bst;
51 	struct timespec	bix_lastupdated;
52 	struct timespec	bst_lastupdated;
53 };
54 
55 static int	acpi_smbat_probe(device_t dev);
56 static int	acpi_smbat_attach(device_t dev);
57 static int	acpi_smbat_shutdown(device_t dev);
58 static int	acpi_smbat_info_expired(struct timespec *lastupdated);
59 static void	acpi_smbat_info_updated(struct timespec *lastupdated);
60 static int	acpi_smbat_get_bix(device_t dev, void *, size_t);
61 static int	acpi_smbat_get_bst(device_t dev, struct acpi_bst *bst);
62 
63 ACPI_SERIAL_DECL(smbat, "ACPI Smart Battery");
64 
65 static SYSCTL_NODE(_debug_acpi, OID_AUTO, batt,
66     CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
67     "Battery debugging");
68 
69 /* On some laptops with smart batteries, enabling battery monitoring
70  * software causes keystrokes from atkbd to be lost.  This has also been
71  * reported on Linux, and is apparently due to the keyboard and I2C line
72  * for the battery being routed through the same chip.  Whether that's
73  * accurate or not, adding extra sleeps to the status checking code
74  * causes the problem to go away.
75  *
76  * If you experience that problem, try a value of 10ms and move up
77  * from there.
78  */
79 static int      batt_sleep_ms;
80 SYSCTL_INT(_debug_acpi_batt, OID_AUTO, batt_sleep_ms, CTLFLAG_RW, &batt_sleep_ms, 0,
81     "Sleep during battery status updates to prevent keystroke loss.");
82 
83 static device_method_t acpi_smbat_methods[] = {
84 	/* device interface */
85 	DEVMETHOD(device_probe, acpi_smbat_probe),
86 	DEVMETHOD(device_attach, acpi_smbat_attach),
87 	DEVMETHOD(device_shutdown, acpi_smbat_shutdown),
88 
89 	/* ACPI battery interface */
90 	DEVMETHOD(acpi_batt_get_status, acpi_smbat_get_bst),
91 	DEVMETHOD(acpi_batt_get_info, acpi_smbat_get_bix),
92 
93 	DEVMETHOD_END
94 };
95 
96 static driver_t	acpi_smbat_driver = {
97 	"battery",
98 	acpi_smbat_methods,
99 	sizeof(struct acpi_smbat_softc),
100 };
101 
102 static devclass_t acpi_smbat_devclass;
103 DRIVER_MODULE(acpi_smbat, acpi, acpi_smbat_driver, acpi_smbat_devclass, 0, 0);
104 MODULE_DEPEND(acpi_smbat, acpi, 1, 1, 1);
105 
106 static int
107 acpi_smbat_probe(device_t dev)
108 {
109 	static char *smbat_ids[] = {"ACPI0001", "ACPI0005", NULL};
110 	ACPI_STATUS status;
111 	int rv;
112 
113 	if (acpi_disabled("smbat"))
114 		return (ENXIO);
115 	rv = ACPI_ID_PROBE(device_get_parent(dev), dev, smbat_ids, NULL);
116 	if (rv > 0)
117 	  return (rv);
118 	status = AcpiEvaluateObject(acpi_get_handle(dev), "_EC", NULL, NULL);
119 	if (ACPI_FAILURE(status))
120 		return (ENXIO);
121 	device_set_desc(dev, "ACPI Smart Battery");
122 	return (rv);
123 }
124 
125 static int
126 acpi_smbat_attach(device_t dev)
127 {
128 	struct acpi_smbat_softc *sc;
129 	uint32_t base;
130 
131 	sc = device_get_softc(dev);
132 	if (ACPI_FAILURE(acpi_GetInteger(acpi_get_handle(dev), "_EC", &base))) {
133 		device_printf(dev, "cannot get EC base address\n");
134 		return (ENXIO);
135 	}
136 	sc->sb_base_addr = (base >> 8) & 0xff;
137 
138 	/* XXX Only works with one EC, but nearly all systems only have one. */
139 	sc->ec_dev = devclass_get_device(devclass_find("acpi_ec"), 0);
140 	if (sc->ec_dev == NULL) {
141 		device_printf(dev, "cannot find EC device\n");
142 		return (ENXIO);
143 	}
144 
145 	timespecclear(&sc->bix_lastupdated);
146 	timespecclear(&sc->bst_lastupdated);
147 
148 	if (acpi_battery_register(dev) != 0) {
149 		device_printf(dev, "cannot register battery\n");
150 		return (ENXIO);
151 	}
152 	return (0);
153 }
154 
155 static int
156 acpi_smbat_shutdown(device_t dev)
157 {
158 
159 	acpi_battery_remove(dev);
160 	return (0);
161 }
162 
163 static int
164 acpi_smbat_info_expired(struct timespec *lastupdated)
165 {
166 	struct timespec	curtime;
167 
168 	ACPI_SERIAL_ASSERT(smbat);
169 
170 	if (lastupdated == NULL)
171 		return (TRUE);
172 	if (!timespecisset(lastupdated))
173 		return (TRUE);
174 
175 	getnanotime(&curtime);
176 	timespecsub(&curtime, lastupdated, &curtime);
177 	return (curtime.tv_sec < 0 ||
178 	    curtime.tv_sec > acpi_battery_get_info_expire());
179 }
180 
181 static void
182 acpi_smbat_info_updated(struct timespec *lastupdated)
183 {
184 
185 	ACPI_SERIAL_ASSERT(smbat);
186 
187 	if (lastupdated != NULL)
188 		getnanotime(lastupdated);
189 }
190 
191 static int
192 acpi_smbus_read_2(struct acpi_smbat_softc *sc, uint8_t addr, uint8_t cmd,
193     uint16_t *ptr)
194 {
195 	int error, to;
196 	UINT64 val;
197 
198 	ACPI_SERIAL_ASSERT(smbat);
199 
200 	if (batt_sleep_ms)
201 	    AcpiOsSleep(batt_sleep_ms);
202 
203 	val = addr;
204 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_ADDR,
205 	    val, 1);
206 	if (error)
207 		goto out;
208 
209 	val = cmd;
210 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_CMD,
211 	    val, 1);
212 	if (error)
213 		goto out;
214 
215 	val = 0x09; /* | 0x80 if PEC */
216 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
217 	    val, 1);
218 	if (error)
219 		goto out;
220 
221 	if (batt_sleep_ms)
222 	    AcpiOsSleep(batt_sleep_ms);
223 
224 	for (to = SMBUS_TIMEOUT; to != 0; to--) {
225 		error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
226 		    &val, 1);
227 		if (error)
228 			goto out;
229 		if (val == 0)
230 			break;
231 		AcpiOsSleep(10);
232 	}
233 	if (to == 0) {
234 		error = ETIMEDOUT;
235 		goto out;
236 	}
237 
238 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_STS, &val, 1);
239 	if (error)
240 		goto out;
241 	if (val & SMBUS_STS_MASK) {
242 		printf("%s: AE_ERROR 0x%x\n",
243 		       __FUNCTION__, (int)(val & SMBUS_STS_MASK));
244 		error = EIO;
245 		goto out;
246 	}
247 
248 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_DATA,
249 	    &val, 2);
250 	if (error)
251 		goto out;
252 
253 	*ptr = val;
254 
255 out:
256 	return (error);
257 }
258 
259 static int
260 acpi_smbus_read_multi_1(struct acpi_smbat_softc *sc, uint8_t addr, uint8_t cmd,
261     uint8_t *ptr, uint16_t len)
262 {
263 	UINT64 val;
264 	uint8_t	to;
265 	int error;
266 
267 	ACPI_SERIAL_ASSERT(smbat);
268 
269 	if (batt_sleep_ms)
270 	    AcpiOsSleep(batt_sleep_ms);
271 
272 	val = addr;
273 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_ADDR,
274 	    val, 1);
275 	if (error)
276 		goto out;
277 
278 	val = cmd;
279 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_CMD,
280 	    val, 1);
281 	if (error)
282 		goto out;
283 
284 	val = 0x0B /* | 0x80 if PEC */ ;
285 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
286 	    val, 1);
287 	if (error)
288 		goto out;
289 
290 	if (batt_sleep_ms)
291 	    AcpiOsSleep(batt_sleep_ms);
292 
293 	for (to = SMBUS_TIMEOUT; to != 0; to--) {
294 		error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
295 		    &val, 1);
296 		if (error)
297 			goto out;
298 		if (val == 0)
299 			break;
300 		AcpiOsSleep(10);
301 	}
302 	if (to == 0) {
303 		error = ETIMEDOUT;
304 		goto out;
305 	}
306 
307 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_STS, &val, 1);
308 	if (error)
309 		goto out;
310 	if (val & SMBUS_STS_MASK) {
311 		printf("%s: AE_ERROR 0x%x\n",
312 		       __FUNCTION__, (int)(val & SMBUS_STS_MASK));
313 		error = EIO;
314 		goto out;
315 	}
316 
317 	/* get length */
318 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_BCNT,
319 	    &val, 1);
320 	if (error)
321 		goto out;
322 	val = (val & 0x1f) + 1;
323 
324 	bzero(ptr, len);
325 	if (len > val)
326 		len = val;
327 
328 	if (batt_sleep_ms)
329 	    AcpiOsSleep(batt_sleep_ms);
330 
331 	while (len--) {
332 		error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_DATA
333 		    + len, &val, 1);
334 		if (error)
335 			goto out;
336 
337 		ptr[len] = val;
338 		if (batt_sleep_ms)
339 		    AcpiOsSleep(batt_sleep_ms);
340 	}
341 
342 out:
343 	return (error);
344 }
345 
346 static int
347 acpi_smbat_get_bst(device_t dev, struct acpi_bst *bst)
348 {
349 	struct acpi_smbat_softc *sc;
350 	int error;
351 	uint32_t factor;
352 	int16_t val;
353 	uint8_t	addr;
354 
355 	ACPI_SERIAL_BEGIN(smbat);
356 
357 	addr = SMBATT_ADDRESS;
358 	error = ENXIO;
359 	sc = device_get_softc(dev);
360 
361 	if (!acpi_smbat_info_expired(&sc->bst_lastupdated)) {
362 		error = 0;
363 		goto out;
364 	}
365 
366 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_MODE, &val))
367 		goto out;
368 	if (val & SMBATT_BM_CAPACITY_MODE)
369 		factor = 10;
370 	else
371 		factor = 1;
372 
373 	/* get battery status */
374 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_STATUS, &val))
375 		goto out;
376 
377 	sc->bst.state = 0;
378 	if (val & SMBATT_BS_DISCHARGING)
379 		sc->bst.state |= ACPI_BATT_STAT_DISCHARG;
380 
381 	if (val & SMBATT_BS_REMAINING_CAPACITY_ALARM)
382 		sc->bst.state |= ACPI_BATT_STAT_CRITICAL;
383 
384 	/*
385 	 * If the rate is negative, it is discharging.  Otherwise,
386 	 * it is charging.
387 	 */
388 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_CURRENT, &val))
389 		goto out;
390 
391 	if (val > 0) {
392 		sc->bst.rate = val * factor;
393 		sc->bst.state &= ~SMBATT_BS_DISCHARGING;
394 		sc->bst.state |= ACPI_BATT_STAT_CHARGING;
395 	} else if (val < 0)
396 		sc->bst.rate = (-val) * factor;
397 	else
398 		sc->bst.rate = 0;
399 
400 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_REMAINING_CAPACITY, &val))
401 		goto out;
402 	sc->bst.cap = val * factor;
403 
404 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_VOLTAGE, &val))
405 		goto out;
406 	sc->bst.volt = val;
407 
408 	acpi_smbat_info_updated(&sc->bst_lastupdated);
409 	error = 0;
410 
411 out:
412 	if (error == 0)
413 		memcpy(bst, &sc->bst, sizeof(sc->bst));
414 	ACPI_SERIAL_END(smbat);
415 	return (error);
416 }
417 
418 static int
419 acpi_smbat_get_bix(device_t dev, void *bix, size_t len)
420 {
421 	struct acpi_smbat_softc *sc;
422 	int error;
423 	uint32_t factor;
424 	uint16_t val;
425 	uint8_t addr;
426 
427 	if (len != sizeof(struct acpi_bix) &&
428 	    len != sizeof(struct acpi_bif))
429 		return (-1);
430 
431 	ACPI_SERIAL_BEGIN(smbat);
432 
433 	addr = SMBATT_ADDRESS;
434 	error = ENXIO;
435 	sc = device_get_softc(dev);
436 
437 	if (!acpi_smbat_info_expired(&sc->bix_lastupdated)) {
438 		error = 0;
439 		goto out;
440 	}
441 
442 	sc->bix.rev = ACPI_BIX_REV_BIF;
443 
444 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_MODE, &val))
445 		goto out;
446 	if (val & SMBATT_BM_CAPACITY_MODE) {
447 		factor = 10;
448 		sc->bix.units = ACPI_BIX_UNITS_MW;
449 	} else {
450 		factor = 1;
451 		sc->bix.units = ACPI_BIX_UNITS_MA;
452 	}
453 
454 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_DESIGN_CAPACITY, &val))
455 		goto out;
456 	sc->bix.dcap = val * factor;
457 
458 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_FULL_CHARGE_CAPACITY, &val))
459 		goto out;
460 	sc->bix.lfcap = val * factor;
461 	sc->bix.btech = 1;		/* secondary (rechargeable) */
462 
463 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_DESIGN_VOLTAGE, &val))
464 		goto out;
465 	sc->bix.dvol = val;
466 
467 	sc->bix.wcap = sc->bix.dcap / 10;
468 	sc->bix.lcap = sc->bix.dcap / 10;
469 
470 	sc->bix.gra1 = factor;	/* not supported */
471 	sc->bix.gra2 = factor;	/* not supported */
472 
473 	if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_DEVICE_NAME,
474 	    sc->bix.model, sizeof(sc->bix.model)))
475 		goto out;
476 
477 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_SERIAL_NUMBER, &val))
478 		goto out;
479 	snprintf(sc->bix.serial, sizeof(sc->bix.serial), "0x%04x", val);
480 
481 	if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_DEVICE_CHEMISTRY,
482 	    sc->bix.type, sizeof(sc->bix.type)))
483 		goto out;
484 
485 	if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_MANUFACTURER_DATA,
486 	    sc->bix.oeminfo, sizeof(sc->bix.oeminfo)))
487 		goto out;
488 
489 	/* XXX check if device was replugged during read? */
490 
491 	acpi_smbat_info_updated(&sc->bix_lastupdated);
492 	error = 0;
493 
494 out:
495 	if (error == 0)
496 	    memcpy(bix, &sc->bix, len);
497 	ACPI_SERIAL_END(smbat);
498 	return (error);
499 }
500