xref: /freebsd/sys/dev/acpica/acpi_smbat.c (revision b740c88bfb6453416926271c089262e7164dace3) 
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_bif	bif;
50 	struct acpi_bst	bst;
51 	struct timespec	bif_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_bif(device_t dev, struct acpi_bif *bif);
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, CTLFLAG_RD, NULL,
66     "Battery debugging");
67 
68 /* On some laptops with smart batteries, enabling battery monitoring
69  * software causes keystrokes from atkbd to be lost.  This has also been
70  * reported on Linux, and is apparently due to the keyboard and I2C line
71  * for the battery being routed through the same chip.  Whether that's
72  * accurate or not, adding extra sleeps to the status checking code
73  * causes the problem to go away.
74  *
75  * If you experience that problem, try a value of 10ms and move up
76  * from there.
77  */
78 static int      batt_sleep_ms;
79 SYSCTL_INT(_debug_acpi_batt, OID_AUTO, batt_sleep_ms, CTLFLAG_RW, &batt_sleep_ms, 0,
80     "Sleep during battery status updates to prevent keystroke loss.");
81 
82 static device_method_t acpi_smbat_methods[] = {
83 	/* device interface */
84 	DEVMETHOD(device_probe, acpi_smbat_probe),
85 	DEVMETHOD(device_attach, acpi_smbat_attach),
86 	DEVMETHOD(device_shutdown, acpi_smbat_shutdown),
87 
88 	/* ACPI battery interface */
89 	DEVMETHOD(acpi_batt_get_status, acpi_smbat_get_bst),
90 	DEVMETHOD(acpi_batt_get_info, acpi_smbat_get_bif),
91 
92 	DEVMETHOD_END
93 };
94 
95 static driver_t	acpi_smbat_driver = {
96 	"battery",
97 	acpi_smbat_methods,
98 	sizeof(struct acpi_smbat_softc),
99 };
100 
101 static devclass_t acpi_smbat_devclass;
102 DRIVER_MODULE(acpi_smbat, acpi, acpi_smbat_driver, acpi_smbat_devclass, 0, 0);
103 MODULE_DEPEND(acpi_smbat, acpi, 1, 1, 1);
104 
105 static int
106 acpi_smbat_probe(device_t dev)
107 {
108 	static char *smbat_ids[] = {"ACPI0001", "ACPI0005", NULL};
109 	ACPI_STATUS status;
110 
111 	if (acpi_disabled("smbat") ||
112 	    ACPI_ID_PROBE(device_get_parent(dev), dev, smbat_ids) == NULL)
113 		return (ENXIO);
114 	status = AcpiEvaluateObject(acpi_get_handle(dev), "_EC", NULL, NULL);
115 	if (ACPI_FAILURE(status))
116 		return (ENXIO);
117 
118 	device_set_desc(dev, "ACPI Smart Battery");
119 	return (0);
120 }
121 
122 static int
123 acpi_smbat_attach(device_t dev)
124 {
125 	struct acpi_smbat_softc *sc;
126 	uint32_t base;
127 
128 	sc = device_get_softc(dev);
129 	if (ACPI_FAILURE(acpi_GetInteger(acpi_get_handle(dev), "_EC", &base))) {
130 		device_printf(dev, "cannot get EC base address\n");
131 		return (ENXIO);
132 	}
133 	sc->sb_base_addr = (base >> 8) & 0xff;
134 
135 	/* XXX Only works with one EC, but nearly all systems only have one. */
136 	sc->ec_dev = devclass_get_device(devclass_find("acpi_ec"), 0);
137 	if (sc->ec_dev == NULL) {
138 		device_printf(dev, "cannot find EC device\n");
139 		return (ENXIO);
140 	}
141 
142 	timespecclear(&sc->bif_lastupdated);
143 	timespecclear(&sc->bst_lastupdated);
144 
145 	if (acpi_battery_register(dev) != 0) {
146 		device_printf(dev, "cannot register battery\n");
147 		return (ENXIO);
148 	}
149 	return (0);
150 }
151 
152 static int
153 acpi_smbat_shutdown(device_t dev)
154 {
155 
156 	acpi_battery_remove(dev);
157 	return (0);
158 }
159 
160 static int
161 acpi_smbat_info_expired(struct timespec *lastupdated)
162 {
163 	struct timespec	curtime;
164 
165 	ACPI_SERIAL_ASSERT(smbat);
166 
167 	if (lastupdated == NULL)
168 		return (TRUE);
169 	if (!timespecisset(lastupdated))
170 		return (TRUE);
171 
172 	getnanotime(&curtime);
173 	timespecsub(&curtime, lastupdated);
174 	return (curtime.tv_sec < 0 ||
175 	    curtime.tv_sec > acpi_battery_get_info_expire());
176 }
177 
178 static void
179 acpi_smbat_info_updated(struct timespec *lastupdated)
180 {
181 
182 	ACPI_SERIAL_ASSERT(smbat);
183 
184 	if (lastupdated != NULL)
185 		getnanotime(lastupdated);
186 }
187 
188 static int
189 acpi_smbus_read_2(struct acpi_smbat_softc *sc, uint8_t addr, uint8_t cmd,
190     uint16_t *ptr)
191 {
192 	int error, to;
193 	UINT64 val;
194 
195 	ACPI_SERIAL_ASSERT(smbat);
196 
197 	if (batt_sleep_ms)
198 	    AcpiOsSleep(batt_sleep_ms);
199 
200 	val = addr;
201 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_ADDR,
202 	    val, 1);
203 	if (error)
204 		goto out;
205 
206 	val = cmd;
207 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_CMD,
208 	    val, 1);
209 	if (error)
210 		goto out;
211 
212 	val = 0x09; /* | 0x80 if PEC */
213 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
214 	    val, 1);
215 	if (error)
216 		goto out;
217 
218 	if (batt_sleep_ms)
219 	    AcpiOsSleep(batt_sleep_ms);
220 
221 	for (to = SMBUS_TIMEOUT; to != 0; to--) {
222 		error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
223 		    &val, 1);
224 		if (error)
225 			goto out;
226 		if (val == 0)
227 			break;
228 		AcpiOsSleep(10);
229 	}
230 	if (to == 0) {
231 		error = ETIMEDOUT;
232 		goto out;
233 	}
234 
235 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_STS, &val, 1);
236 	if (error)
237 		goto out;
238 	if (val & SMBUS_STS_MASK) {
239 		printf("%s: AE_ERROR 0x%x\n",
240 		       __FUNCTION__, (int)(val & SMBUS_STS_MASK));
241 		error = EIO;
242 		goto out;
243 	}
244 
245 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_DATA,
246 	    &val, 2);
247 	if (error)
248 		goto out;
249 
250 	*ptr = val;
251 
252 out:
253 	return (error);
254 }
255 
256 static int
257 acpi_smbus_read_multi_1(struct acpi_smbat_softc *sc, uint8_t addr, uint8_t cmd,
258     uint8_t *ptr, uint16_t len)
259 {
260 	UINT64 val;
261 	uint8_t	to;
262 	int error;
263 
264 	ACPI_SERIAL_ASSERT(smbat);
265 
266 	if (batt_sleep_ms)
267 	    AcpiOsSleep(batt_sleep_ms);
268 
269 	val = addr;
270 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_ADDR,
271 	    val, 1);
272 	if (error)
273 		goto out;
274 
275 	val = cmd;
276 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_CMD,
277 	    val, 1);
278 	if (error)
279 		goto out;
280 
281 	val = 0x0B /* | 0x80 if PEC */ ;
282 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
283 	    val, 1);
284 	if (error)
285 		goto out;
286 
287 	if (batt_sleep_ms)
288 	    AcpiOsSleep(batt_sleep_ms);
289 
290 	for (to = SMBUS_TIMEOUT; to != 0; to--) {
291 		error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
292 		    &val, 1);
293 		if (error)
294 			goto out;
295 		if (val == 0)
296 			break;
297 		AcpiOsSleep(10);
298 	}
299 	if (to == 0) {
300 		error = ETIMEDOUT;
301 		goto out;
302 	}
303 
304 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_STS, &val, 1);
305 	if (error)
306 		goto out;
307 	if (val & SMBUS_STS_MASK) {
308 		printf("%s: AE_ERROR 0x%x\n",
309 		       __FUNCTION__, (int)(val & SMBUS_STS_MASK));
310 		error = EIO;
311 		goto out;
312 	}
313 
314 	/* get length */
315 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_BCNT,
316 	    &val, 1);
317 	if (error)
318 		goto out;
319 	val = (val & 0x1f) + 1;
320 
321 	bzero(ptr, len);
322 	if (len > val)
323 		len = val;
324 
325 	if (batt_sleep_ms)
326 	    AcpiOsSleep(batt_sleep_ms);
327 
328 	while (len--) {
329 		error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_DATA
330 		    + len, &val, 1);
331 		if (error)
332 			goto out;
333 
334 		ptr[len] = val;
335 		if (batt_sleep_ms)
336 		    AcpiOsSleep(batt_sleep_ms);
337 	}
338 
339 out:
340 	return (error);
341 }
342 
343 static int
344 acpi_smbat_get_bst(device_t dev, struct acpi_bst *bst)
345 {
346 	struct acpi_smbat_softc *sc;
347 	int error;
348 	uint32_t factor;
349 	int16_t val;
350 	uint8_t	addr;
351 
352 	ACPI_SERIAL_BEGIN(smbat);
353 
354 	addr = SMBATT_ADDRESS;
355 	error = ENXIO;
356 	sc = device_get_softc(dev);
357 
358 	if (!acpi_smbat_info_expired(&sc->bst_lastupdated)) {
359 		error = 0;
360 		goto out;
361 	}
362 
363 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_MODE, &val))
364 		goto out;
365 	if (val & SMBATT_BM_CAPACITY_MODE)
366 		factor = 10;
367 	else
368 		factor = 1;
369 
370 	/* get battery status */
371 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_STATUS, &val))
372 		goto out;
373 
374 	sc->bst.state = 0;
375 	if (val & SMBATT_BS_DISCHARGING)
376 		sc->bst.state |= ACPI_BATT_STAT_DISCHARG;
377 
378 	if (val & SMBATT_BS_REMAINING_CAPACITY_ALARM)
379 		sc->bst.state |= ACPI_BATT_STAT_CRITICAL;
380 
381 	/*
382 	 * If the rate is negative, it is discharging.  Otherwise,
383 	 * it is charging.
384 	 */
385 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_CURRENT, &val))
386 		goto out;
387 
388 	if (val > 0) {
389 		sc->bst.rate = val * factor;
390 		sc->bst.state &= ~SMBATT_BS_DISCHARGING;
391 		sc->bst.state |= ACPI_BATT_STAT_CHARGING;
392 	} else if (val < 0)
393 		sc->bst.rate = (-val) * factor;
394 	else
395 		sc->bst.rate = 0;
396 
397 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_REMAINING_CAPACITY, &val))
398 		goto out;
399 	sc->bst.cap = val * factor;
400 
401 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_VOLTAGE, &val))
402 		goto out;
403 	sc->bst.volt = val;
404 
405 	acpi_smbat_info_updated(&sc->bst_lastupdated);
406 	error = 0;
407 
408 out:
409 	if (error == 0)
410 		memcpy(bst, &sc->bst, sizeof(sc->bst));
411 	ACPI_SERIAL_END(smbat);
412 	return (error);
413 }
414 
415 static int
416 acpi_smbat_get_bif(device_t dev, struct acpi_bif *bif)
417 {
418 	struct acpi_smbat_softc *sc;
419 	int error;
420 	uint32_t factor;
421 	uint16_t val;
422 	uint8_t addr;
423 
424 	ACPI_SERIAL_BEGIN(smbat);
425 
426 	addr = SMBATT_ADDRESS;
427 	error = ENXIO;
428 	sc = device_get_softc(dev);
429 
430 	if (!acpi_smbat_info_expired(&sc->bif_lastupdated)) {
431 		error = 0;
432 		goto out;
433 	}
434 
435 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_MODE, &val))
436 		goto out;
437 	if (val & SMBATT_BM_CAPACITY_MODE) {
438 		factor = 10;
439 		sc->bif.units = ACPI_BIF_UNITS_MW;
440 	} else {
441 		factor = 1;
442 		sc->bif.units = ACPI_BIF_UNITS_MA;
443 	}
444 
445 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_DESIGN_CAPACITY, &val))
446 		goto out;
447 	sc->bif.dcap = val * factor;
448 
449 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_FULL_CHARGE_CAPACITY, &val))
450 		goto out;
451 	sc->bif.lfcap = val * factor;
452 	sc->bif.btech = 1;		/* secondary (rechargeable) */
453 
454 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_DESIGN_VOLTAGE, &val))
455 		goto out;
456 	sc->bif.dvol = val;
457 
458 	sc->bif.wcap = sc->bif.dcap / 10;
459 	sc->bif.lcap = sc->bif.dcap / 10;
460 
461 	sc->bif.gra1 = factor;	/* not supported */
462 	sc->bif.gra2 = factor;	/* not supported */
463 
464 	if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_DEVICE_NAME,
465 	    sc->bif.model, sizeof(sc->bif.model)))
466 		goto out;
467 
468 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_SERIAL_NUMBER, &val))
469 		goto out;
470 	snprintf(sc->bif.serial, sizeof(sc->bif.serial), "0x%04x", val);
471 
472 	if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_DEVICE_CHEMISTRY,
473 	    sc->bif.type, sizeof(sc->bif.type)))
474 		goto out;
475 
476 	if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_MANUFACTURER_DATA,
477 	    sc->bif.oeminfo, sizeof(sc->bif.oeminfo)))
478 		goto out;
479 
480 	/* XXX check if device was replugged during read? */
481 
482 	acpi_smbat_info_updated(&sc->bif_lastupdated);
483 	error = 0;
484 
485 out:
486 	if (error == 0)
487 		memcpy(bif, &sc->bif, sizeof(sc->bif));
488 	ACPI_SERIAL_END(smbat);
489 	return (error);
490 }
491