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: releng/7.3/sys/dev/acpica/acpi_smbat.c 187356 2009-01-17 06:55:28Z silby $");
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/acpi.h>
37 #include <dev/acpica/acpivar.h>
38 #include <dev/acpica/acpiio.h>
39 #include <dev/acpica/acpi_smbus.h>
40
41 /* Transactions have failed after 500 ms. */
42 #define SMBUS_TIMEOUT 50
43
44 struct acpi_smbat_softc {
45 uint8_t sb_base_addr;
46 device_t ec_dev;
47
48 struct acpi_bif bif;
49 struct acpi_bst bst;
50 struct timespec bif_lastupdated;
51 struct timespec bst_lastupdated;
52 };
53
54 static int acpi_smbat_probe(device_t dev);
55 static int acpi_smbat_attach(device_t dev);
56 static int acpi_smbat_shutdown(device_t dev);
57 static int acpi_smbat_info_expired(struct timespec *lastupdated);
58 static void acpi_smbat_info_updated(struct timespec *lastupdated);
59 static int acpi_smbat_get_bif(device_t dev, struct acpi_bif *bif);
60 static int acpi_smbat_get_bst(device_t dev, struct acpi_bst *bst);
61
62 ACPI_SERIAL_DECL(smbat, "ACPI Smart Battery");
63
64 SYSCTL_DECL(_debug_acpi);
65 SYSCTL_NODE(_debug_acpi, OID_AUTO, batt, CTLFLAG_RD, NULL, "Battery debugging");
66
67 /* On some laptops with smart batteries, enabling battery monitoring
68 * software causes keystrokes from atkbd to be lost. This has also been
69 * reported on Linux, and is apparently due to the keyboard and I2C line
70 * for the battery being routed through the same chip. Whether that's
71 * accurate or not, adding extra sleeps to the status checking code
72 * causes the problem to go away.
73 *
74 * If you experience that problem, try a value of 10ms and move up
75 * from there.
76 */
77 static int batt_sleep_ms;
78 SYSCTL_INT(_debug_acpi_batt, OID_AUTO, batt_sleep_ms, CTLFLAG_RW, &batt_sleep_ms, 0,
79 "Sleep during battery status updates to prevent keystroke loss.");
80
81 static device_method_t acpi_smbat_methods[] = {
82 /* device interface */
83 DEVMETHOD(device_probe, acpi_smbat_probe),
84 DEVMETHOD(device_attach, acpi_smbat_attach),
85 DEVMETHOD(device_shutdown, acpi_smbat_shutdown),
86
87 /* ACPI battery interface */
88 DEVMETHOD(acpi_batt_get_status, acpi_smbat_get_bst),
89 DEVMETHOD(acpi_batt_get_info, acpi_smbat_get_bif),
90
91 {0, 0}
92 };
93
94 static driver_t acpi_smbat_driver = {
95 "battery",
96 acpi_smbat_methods,
97 sizeof(struct acpi_smbat_softc),
98 };
99
100 static devclass_t acpi_smbat_devclass;
101 DRIVER_MODULE(acpi_smbat, acpi, acpi_smbat_driver, acpi_smbat_devclass, 0, 0);
102 MODULE_DEPEND(acpi_smbat, acpi, 1, 1, 1);
103
104 static int
105 acpi_smbat_probe(device_t dev)
106 {
107 static char *smbat_ids[] = {"ACPI0001", "ACPI0005", NULL};
108 ACPI_STATUS status;
109
110 if (acpi_disabled("smbat") ||
111 ACPI_ID_PROBE(device_get_parent(dev), dev, smbat_ids) == NULL)
112 return (ENXIO);
113 status = AcpiEvaluateObject(acpi_get_handle(dev), "_EC", NULL, NULL);
114 if (ACPI_FAILURE(status))
115 return (ENXIO);
116
117 device_set_desc(dev, "ACPI Smart Battery");
118 return (0);
119 }
120
121 static int
122 acpi_smbat_attach(device_t dev)
123 {
124 struct acpi_smbat_softc *sc;
125 uint32_t base;
126
127 sc = device_get_softc(dev);
128 if (ACPI_FAILURE(acpi_GetInteger(acpi_get_handle(dev), "_EC", &base))) {
129 device_printf(dev, "cannot get EC base address\n");
130 return (ENXIO);
131 }
132 sc->sb_base_addr = (base >> 8) & 0xff;
133
134 /* XXX Only works with one EC, but nearly all systems only have one. */
135 sc->ec_dev = devclass_get_device(devclass_find("acpi_ec"), 0);
136 if (sc->ec_dev == NULL) {
137 device_printf(dev, "cannot find EC device\n");
138 return (ENXIO);
139 }
140
141 timespecclear(&sc->bif_lastupdated);
142 timespecclear(&sc->bst_lastupdated);
143
144 if (acpi_battery_register(dev) != 0) {
145 device_printf(dev, "cannot register battery\n");
146 return (ENXIO);
147 }
148 return (0);
149 }
150
151 static int
152 acpi_smbat_shutdown(device_t dev)
153 {
154
155 acpi_battery_remove(dev);
156 return (0);
157 }
158
159 static int
160 acpi_smbat_info_expired(struct timespec *lastupdated)
161 {
162 struct timespec curtime;
163
164 ACPI_SERIAL_ASSERT(smbat);
165
166 if (lastupdated == NULL)
167 return (TRUE);
168 if (!timespecisset(lastupdated))
169 return (TRUE);
170
171 getnanotime(&curtime);
172 timespecsub(&curtime, lastupdated);
173 return (curtime.tv_sec < 0 ||
174 curtime.tv_sec > acpi_battery_get_info_expire());
175 }
176
177 static void
178 acpi_smbat_info_updated(struct timespec *lastupdated)
179 {
180
181 ACPI_SERIAL_ASSERT(smbat);
182
183 if (lastupdated != NULL)
184 getnanotime(lastupdated);
185 }
186
187 static int
188 acpi_smbus_read_2(struct acpi_smbat_softc *sc, uint8_t addr, uint8_t cmd,
189 uint16_t *ptr)
190 {
191 int error, to;
192 ACPI_INTEGER val;
193
194 ACPI_SERIAL_ASSERT(smbat);
195
196 if (batt_sleep_ms)
197 AcpiOsSleep(batt_sleep_ms);
198
199 val = addr;
200 error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_ADDR,
201 val, 1);
202 if (error)
203 goto out;
204
205 val = cmd;
206 error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_CMD,
207 val, 1);
208 if (error)
209 goto out;
210
211 val = 0x09; /* | 0x80 if PEC */
212 error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
213 val, 1);
214 if (error)
215 goto out;
216
217 if (batt_sleep_ms)
218 AcpiOsSleep(batt_sleep_ms);
219
220 for (to = SMBUS_TIMEOUT; to != 0; to--) {
221 error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
222 &val, 1);
223 if (error)
224 goto out;
225 if (val == 0)
226 break;
227 AcpiOsSleep(10);
228 }
229 if (to == 0) {
230 error = ETIMEDOUT;
231 goto out;
232 }
233
234 error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_STS, &val, 1);
235 if (error)
236 goto out;
237 if (val & SMBUS_STS_MASK) {
238 printf("%s: AE_ERROR 0x%x\n",
239 __FUNCTION__, (int)(val & SMBUS_STS_MASK));
240 error = EIO;
241 goto out;
242 }
243
244 error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_DATA,
245 &val, 2);
246 if (error)
247 goto out;
248
249 *ptr = val;
250
251 out:
252 return (error);
253 }
254
255 static int
256 acpi_smbus_read_multi_1(struct acpi_smbat_softc *sc, uint8_t addr, uint8_t cmd,
257 uint8_t *ptr, uint16_t len)
258 {
259 ACPI_INTEGER val;
260 uint8_t to;
261 int error;
262
263 ACPI_SERIAL_ASSERT(smbat);
264
265 if (batt_sleep_ms)
266 AcpiOsSleep(batt_sleep_ms);
267
268 val = addr;
269 error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_ADDR,
270 val, 1);
271 if (error)
272 goto out;
273
274 val = cmd;
275 error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_CMD,
276 val, 1);
277 if (error)
278 goto out;
279
280 val = 0x0B /* | 0x80 if PEC */ ;
281 error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
282 val, 1);
283 if (error)
284 goto out;
285
286 if (batt_sleep_ms)
287 AcpiOsSleep(batt_sleep_ms);
288
289 for (to = SMBUS_TIMEOUT; to != 0; to--) {
290 error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
291 &val, 1);
292 if (error)
293 goto out;
294 if (val == 0)
295 break;
296 AcpiOsSleep(10);
297 }
298 if (to == 0) {
299 error = ETIMEDOUT;
300 goto out;
301 }
302
303 error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_STS, &val, 1);
304 if (error)
305 goto out;
306 if (val & SMBUS_STS_MASK) {
307 printf("%s: AE_ERROR 0x%x\n",
308 __FUNCTION__, (int)(val & SMBUS_STS_MASK));
309 error = EIO;
310 goto out;
311 }
312
313 /* get length */
314 error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_BCNT,
315 &val, 1);
316 if (error)
317 goto out;
318 val = (val & 0x1f) + 1;
319
320 bzero(ptr, len);
321 if (len > val)
322 len = val;
323
324 if (batt_sleep_ms)
325 AcpiOsSleep(batt_sleep_ms);
326
327 while (len--) {
328 error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_DATA
329 + len, &val, 1);
330 if (error)
331 goto out;
332
333 ptr[len] = val;
334 if (batt_sleep_ms)
335 AcpiOsSleep(batt_sleep_ms);
336 }
337
338 out:
339 return (error);
340 }
341
342 static int
343 acpi_smbat_get_bst(device_t dev, struct acpi_bst *bst)
344 {
345 struct acpi_smbat_softc *sc;
346 int error;
347 uint32_t cap_units, factor;
348 int16_t val;
349 uint8_t addr;
350
351 ACPI_SERIAL_BEGIN(smbat);
352
353 addr = SMBATT_ADDRESS;
354 error = ENXIO;
355 sc = device_get_softc(dev);
356
357 if (!acpi_smbat_info_expired(&sc->bst_lastupdated)) {
358 error = 0;
359 goto out;
360 }
361
362 if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_MODE, &val))
363 goto out;
364 if (val & SMBATT_BM_CAPACITY_MODE) {
365 factor = 10;
366 cap_units = ACPI_BIF_UNITS_MW;
367 } else {
368 factor = 1;
369 cap_units = ACPI_BIF_UNITS_MA;
370 }
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 |= ACPI_BATT_STAT_CHARGING;
393 } else if (val < 0)
394 sc->bst.rate = (-val) * factor;
395 else
396 sc->bst.rate = 0;
397
398 if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_REMAINING_CAPACITY, &val))
399 goto out;
400 sc->bst.cap = val * factor;
401
402 if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_VOLTAGE, &val))
403 goto out;
404 sc->bst.volt = val;
405
406 acpi_smbat_info_updated(&sc->bst_lastupdated);
407 error = 0;
408
409 out:
410 if (error == 0)
411 memcpy(bst, &sc->bst, sizeof(sc->bst));
412 ACPI_SERIAL_END(smbat);
413 return (error);
414 }
415
416 static int
417 acpi_smbat_get_bif(device_t dev, struct acpi_bif *bif)
418 {
419 struct acpi_smbat_softc *sc;
420 int error;
421 uint32_t factor;
422 uint16_t val;
423 uint8_t addr;
424
425 ACPI_SERIAL_BEGIN(smbat);
426
427 addr = SMBATT_ADDRESS;
428 error = ENXIO;
429 sc = device_get_softc(dev);
430
431 if (!acpi_smbat_info_expired(&sc->bif_lastupdated)) {
432 error = 0;
433 goto out;
434 }
435
436 if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_MODE, &val))
437 goto out;
438 if (val & SMBATT_BM_CAPACITY_MODE) {
439 factor = 10;
440 sc->bif.units = ACPI_BIF_UNITS_MW;
441 } else {
442 factor = 1;
443 sc->bif.units = ACPI_BIF_UNITS_MA;
444 }
445
446 if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_DESIGN_CAPACITY, &val))
447 goto out;
448 sc->bif.dcap = val * factor;
449
450 if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_FULL_CHARGE_CAPACITY, &val))
451 goto out;
452 sc->bif.lfcap = val * factor;
453 sc->bif.btech = 1; /* secondary (rechargeable) */
454
455 if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_DESIGN_VOLTAGE, &val))
456 goto out;
457 sc->bif.dvol = val;
458
459 sc->bif.wcap = sc->bif.dcap / 10;
460 sc->bif.lcap = sc->bif.dcap / 10;
461
462 sc->bif.gra1 = factor; /* not supported */
463 sc->bif.gra2 = factor; /* not supported */
464
465 if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_DEVICE_NAME,
466 sc->bif.model, sizeof(sc->bif.model)))
467 goto out;
468
469 if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_SERIAL_NUMBER, &val))
470 goto out;
471 snprintf(sc->bif.serial, sizeof(sc->bif.serial), "0x%04x", val);
472
473 if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_DEVICE_CHEMISTRY,
474 sc->bif.type, sizeof(sc->bif.type)))
475 goto out;
476
477 if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_MANUFACTURER_DATA,
478 sc->bif.oeminfo, sizeof(sc->bif.oeminfo)))
479 goto out;
480
481 /* XXX check if device was replugged during read? */
482
483 acpi_smbat_info_updated(&sc->bif_lastupdated);
484 error = 0;
485
486 out:
487 if (error == 0)
488 memcpy(bif, &sc->bif, sizeof(sc->bif));
489 ACPI_SERIAL_END(smbat);
490 return (error);
491 }
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