xref: /freebsd/sys/dev/acpica/acpi_smbat.c (revision 148a8da8) 
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 	int rv;
111 
112 	if (acpi_disabled("smbat"))
113 		return (ENXIO);
114 	rv = ACPI_ID_PROBE(device_get_parent(dev), dev, smbat_ids, NULL);
115 	if (rv > 0)
116 	  return (rv);
117 	status = AcpiEvaluateObject(acpi_get_handle(dev), "_EC", NULL, NULL);
118 	if (ACPI_FAILURE(status))
119 		return (ENXIO);
120 	device_set_desc(dev, "ACPI Smart Battery");
121 	return (rv);
122 }
123 
124 static int
125 acpi_smbat_attach(device_t dev)
126 {
127 	struct acpi_smbat_softc *sc;
128 	uint32_t base;
129 
130 	sc = device_get_softc(dev);
131 	if (ACPI_FAILURE(acpi_GetInteger(acpi_get_handle(dev), "_EC", &base))) {
132 		device_printf(dev, "cannot get EC base address\n");
133 		return (ENXIO);
134 	}
135 	sc->sb_base_addr = (base >> 8) & 0xff;
136 
137 	/* XXX Only works with one EC, but nearly all systems only have one. */
138 	sc->ec_dev = devclass_get_device(devclass_find("acpi_ec"), 0);
139 	if (sc->ec_dev == NULL) {
140 		device_printf(dev, "cannot find EC device\n");
141 		return (ENXIO);
142 	}
143 
144 	timespecclear(&sc->bif_lastupdated);
145 	timespecclear(&sc->bst_lastupdated);
146 
147 	if (acpi_battery_register(dev) != 0) {
148 		device_printf(dev, "cannot register battery\n");
149 		return (ENXIO);
150 	}
151 	return (0);
152 }
153 
154 static int
155 acpi_smbat_shutdown(device_t dev)
156 {
157 
158 	acpi_battery_remove(dev);
159 	return (0);
160 }
161 
162 static int
163 acpi_smbat_info_expired(struct timespec *lastupdated)
164 {
165 	struct timespec	curtime;
166 
167 	ACPI_SERIAL_ASSERT(smbat);
168 
169 	if (lastupdated == NULL)
170 		return (TRUE);
171 	if (!timespecisset(lastupdated))
172 		return (TRUE);
173 
174 	getnanotime(&curtime);
175 	timespecsub(&curtime, lastupdated, &curtime);
176 	return (curtime.tv_sec < 0 ||
177 	    curtime.tv_sec > acpi_battery_get_info_expire());
178 }
179 
180 static void
181 acpi_smbat_info_updated(struct timespec *lastupdated)
182 {
183 
184 	ACPI_SERIAL_ASSERT(smbat);
185 
186 	if (lastupdated != NULL)
187 		getnanotime(lastupdated);
188 }
189 
190 static int
191 acpi_smbus_read_2(struct acpi_smbat_softc *sc, uint8_t addr, uint8_t cmd,
192     uint16_t *ptr)
193 {
194 	int error, to;
195 	UINT64 val;
196 
197 	ACPI_SERIAL_ASSERT(smbat);
198 
199 	if (batt_sleep_ms)
200 	    AcpiOsSleep(batt_sleep_ms);
201 
202 	val = addr;
203 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_ADDR,
204 	    val, 1);
205 	if (error)
206 		goto out;
207 
208 	val = cmd;
209 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_CMD,
210 	    val, 1);
211 	if (error)
212 		goto out;
213 
214 	val = 0x09; /* | 0x80 if PEC */
215 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
216 	    val, 1);
217 	if (error)
218 		goto out;
219 
220 	if (batt_sleep_ms)
221 	    AcpiOsSleep(batt_sleep_ms);
222 
223 	for (to = SMBUS_TIMEOUT; to != 0; to--) {
224 		error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
225 		    &val, 1);
226 		if (error)
227 			goto out;
228 		if (val == 0)
229 			break;
230 		AcpiOsSleep(10);
231 	}
232 	if (to == 0) {
233 		error = ETIMEDOUT;
234 		goto out;
235 	}
236 
237 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_STS, &val, 1);
238 	if (error)
239 		goto out;
240 	if (val & SMBUS_STS_MASK) {
241 		printf("%s: AE_ERROR 0x%x\n",
242 		       __FUNCTION__, (int)(val & SMBUS_STS_MASK));
243 		error = EIO;
244 		goto out;
245 	}
246 
247 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_DATA,
248 	    &val, 2);
249 	if (error)
250 		goto out;
251 
252 	*ptr = val;
253 
254 out:
255 	return (error);
256 }
257 
258 static int
259 acpi_smbus_read_multi_1(struct acpi_smbat_softc *sc, uint8_t addr, uint8_t cmd,
260     uint8_t *ptr, uint16_t len)
261 {
262 	UINT64 val;
263 	uint8_t	to;
264 	int error;
265 
266 	ACPI_SERIAL_ASSERT(smbat);
267 
268 	if (batt_sleep_ms)
269 	    AcpiOsSleep(batt_sleep_ms);
270 
271 	val = addr;
272 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_ADDR,
273 	    val, 1);
274 	if (error)
275 		goto out;
276 
277 	val = cmd;
278 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_CMD,
279 	    val, 1);
280 	if (error)
281 		goto out;
282 
283 	val = 0x0B /* | 0x80 if PEC */ ;
284 	error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
285 	    val, 1);
286 	if (error)
287 		goto out;
288 
289 	if (batt_sleep_ms)
290 	    AcpiOsSleep(batt_sleep_ms);
291 
292 	for (to = SMBUS_TIMEOUT; to != 0; to--) {
293 		error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
294 		    &val, 1);
295 		if (error)
296 			goto out;
297 		if (val == 0)
298 			break;
299 		AcpiOsSleep(10);
300 	}
301 	if (to == 0) {
302 		error = ETIMEDOUT;
303 		goto out;
304 	}
305 
306 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_STS, &val, 1);
307 	if (error)
308 		goto out;
309 	if (val & SMBUS_STS_MASK) {
310 		printf("%s: AE_ERROR 0x%x\n",
311 		       __FUNCTION__, (int)(val & SMBUS_STS_MASK));
312 		error = EIO;
313 		goto out;
314 	}
315 
316 	/* get length */
317 	error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_BCNT,
318 	    &val, 1);
319 	if (error)
320 		goto out;
321 	val = (val & 0x1f) + 1;
322 
323 	bzero(ptr, len);
324 	if (len > val)
325 		len = val;
326 
327 	if (batt_sleep_ms)
328 	    AcpiOsSleep(batt_sleep_ms);
329 
330 	while (len--) {
331 		error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_DATA
332 		    + len, &val, 1);
333 		if (error)
334 			goto out;
335 
336 		ptr[len] = val;
337 		if (batt_sleep_ms)
338 		    AcpiOsSleep(batt_sleep_ms);
339 	}
340 
341 out:
342 	return (error);
343 }
344 
345 static int
346 acpi_smbat_get_bst(device_t dev, struct acpi_bst *bst)
347 {
348 	struct acpi_smbat_softc *sc;
349 	int error;
350 	uint32_t factor;
351 	int16_t val;
352 	uint8_t	addr;
353 
354 	ACPI_SERIAL_BEGIN(smbat);
355 
356 	addr = SMBATT_ADDRESS;
357 	error = ENXIO;
358 	sc = device_get_softc(dev);
359 
360 	if (!acpi_smbat_info_expired(&sc->bst_lastupdated)) {
361 		error = 0;
362 		goto out;
363 	}
364 
365 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_MODE, &val))
366 		goto out;
367 	if (val & SMBATT_BM_CAPACITY_MODE)
368 		factor = 10;
369 	else
370 		factor = 1;
371 
372 	/* get battery status */
373 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_STATUS, &val))
374 		goto out;
375 
376 	sc->bst.state = 0;
377 	if (val & SMBATT_BS_DISCHARGING)
378 		sc->bst.state |= ACPI_BATT_STAT_DISCHARG;
379 
380 	if (val & SMBATT_BS_REMAINING_CAPACITY_ALARM)
381 		sc->bst.state |= ACPI_BATT_STAT_CRITICAL;
382 
383 	/*
384 	 * If the rate is negative, it is discharging.  Otherwise,
385 	 * it is charging.
386 	 */
387 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_CURRENT, &val))
388 		goto out;
389 
390 	if (val > 0) {
391 		sc->bst.rate = val * factor;
392 		sc->bst.state &= ~SMBATT_BS_DISCHARGING;
393 		sc->bst.state |= ACPI_BATT_STAT_CHARGING;
394 	} else if (val < 0)
395 		sc->bst.rate = (-val) * factor;
396 	else
397 		sc->bst.rate = 0;
398 
399 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_REMAINING_CAPACITY, &val))
400 		goto out;
401 	sc->bst.cap = val * factor;
402 
403 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_VOLTAGE, &val))
404 		goto out;
405 	sc->bst.volt = val;
406 
407 	acpi_smbat_info_updated(&sc->bst_lastupdated);
408 	error = 0;
409 
410 out:
411 	if (error == 0)
412 		memcpy(bst, &sc->bst, sizeof(sc->bst));
413 	ACPI_SERIAL_END(smbat);
414 	return (error);
415 }
416 
417 static int
418 acpi_smbat_get_bif(device_t dev, struct acpi_bif *bif)
419 {
420 	struct acpi_smbat_softc *sc;
421 	int error;
422 	uint32_t factor;
423 	uint16_t val;
424 	uint8_t addr;
425 
426 	ACPI_SERIAL_BEGIN(smbat);
427 
428 	addr = SMBATT_ADDRESS;
429 	error = ENXIO;
430 	sc = device_get_softc(dev);
431 
432 	if (!acpi_smbat_info_expired(&sc->bif_lastupdated)) {
433 		error = 0;
434 		goto out;
435 	}
436 
437 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_MODE, &val))
438 		goto out;
439 	if (val & SMBATT_BM_CAPACITY_MODE) {
440 		factor = 10;
441 		sc->bif.units = ACPI_BIF_UNITS_MW;
442 	} else {
443 		factor = 1;
444 		sc->bif.units = ACPI_BIF_UNITS_MA;
445 	}
446 
447 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_DESIGN_CAPACITY, &val))
448 		goto out;
449 	sc->bif.dcap = val * factor;
450 
451 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_FULL_CHARGE_CAPACITY, &val))
452 		goto out;
453 	sc->bif.lfcap = val * factor;
454 	sc->bif.btech = 1;		/* secondary (rechargeable) */
455 
456 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_DESIGN_VOLTAGE, &val))
457 		goto out;
458 	sc->bif.dvol = val;
459 
460 	sc->bif.wcap = sc->bif.dcap / 10;
461 	sc->bif.lcap = sc->bif.dcap / 10;
462 
463 	sc->bif.gra1 = factor;	/* not supported */
464 	sc->bif.gra2 = factor;	/* not supported */
465 
466 	if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_DEVICE_NAME,
467 	    sc->bif.model, sizeof(sc->bif.model)))
468 		goto out;
469 
470 	if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_SERIAL_NUMBER, &val))
471 		goto out;
472 	snprintf(sc->bif.serial, sizeof(sc->bif.serial), "0x%04x", val);
473 
474 	if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_DEVICE_CHEMISTRY,
475 	    sc->bif.type, sizeof(sc->bif.type)))
476 		goto out;
477 
478 	if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_MANUFACTURER_DATA,
479 	    sc->bif.oeminfo, sizeof(sc->bif.oeminfo)))
480 		goto out;
481 
482 	/* XXX check if device was replugged during read? */
483 
484 	acpi_smbat_info_updated(&sc->bif_lastupdated);
485 	error = 0;
486 
487 out:
488 	if (error == 0)
489 		memcpy(bif, &sc->bif, sizeof(sc->bif));
490 	ACPI_SERIAL_END(smbat);
491 	return (error);
492 }
493