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11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/mod_devicetable.h>
14#include <linux/types.h>
15#include <linux/err.h>
16#include <linux/device.h>
17#include <linux/platform_device.h>
18#include <linux/power_supply.h>
19#include <linux/jiffies.h>
20#include <linux/sched.h>
21#include <linux/olpc-ec.h>
22#include <asm/olpc.h>
23
24
25#define EC_BAT_VOLTAGE 0x10
26#define EC_BAT_CURRENT 0x11
27#define EC_BAT_ACR 0x12
28#define EC_BAT_TEMP 0x13
29#define EC_AMB_TEMP 0x14
30#define EC_BAT_STATUS 0x15
31#define EC_BAT_SOC 0x16
32#define EC_BAT_SERIAL 0x17
33#define EC_BAT_EEPROM 0x18
34#define EC_BAT_ERRCODE 0x1f
35
36#define BAT_STAT_PRESENT 0x01
37#define BAT_STAT_FULL 0x02
38#define BAT_STAT_LOW 0x04
39#define BAT_STAT_DESTROY 0x08
40#define BAT_STAT_AC 0x10
41#define BAT_STAT_CHARGING 0x20
42#define BAT_STAT_DISCHARGING 0x40
43#define BAT_STAT_TRICKLE 0x80
44
45#define BAT_ERR_INFOFAIL 0x02
46#define BAT_ERR_OVERVOLTAGE 0x04
47#define BAT_ERR_OVERTEMP 0x05
48#define BAT_ERR_GAUGESTOP 0x06
49#define BAT_ERR_OUT_OF_CONTROL 0x07
50#define BAT_ERR_ID_FAIL 0x09
51#define BAT_ERR_ACR_FAIL 0x10
52
53#define BAT_ADDR_MFR_TYPE 0x5F
54
55
56
57
58
59static int olpc_ac_get_prop(struct power_supply *psy,
60 enum power_supply_property psp,
61 union power_supply_propval *val)
62{
63 int ret = 0;
64 uint8_t status;
65
66 switch (psp) {
67 case POWER_SUPPLY_PROP_ONLINE:
68 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
69 if (ret)
70 return ret;
71
72 val->intval = !!(status & BAT_STAT_AC);
73 break;
74 default:
75 ret = -EINVAL;
76 break;
77 }
78 return ret;
79}
80
81static enum power_supply_property olpc_ac_props[] = {
82 POWER_SUPPLY_PROP_ONLINE,
83};
84
85static const struct power_supply_desc olpc_ac_desc = {
86 .name = "olpc-ac",
87 .type = POWER_SUPPLY_TYPE_MAINS,
88 .properties = olpc_ac_props,
89 .num_properties = ARRAY_SIZE(olpc_ac_props),
90 .get_property = olpc_ac_get_prop,
91};
92
93static struct power_supply *olpc_ac;
94
95static char bat_serial[17];
96
97static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte)
98{
99 if (olpc_platform_info.ecver > 0x44) {
100 if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
101 val->intval = POWER_SUPPLY_STATUS_CHARGING;
102 else if (ec_byte & BAT_STAT_DISCHARGING)
103 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
104 else if (ec_byte & BAT_STAT_FULL)
105 val->intval = POWER_SUPPLY_STATUS_FULL;
106 else
107 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
108 } else {
109
110 if (!(ec_byte & BAT_STAT_AC))
111 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
112 else if (ec_byte & BAT_STAT_FULL)
113 val->intval = POWER_SUPPLY_STATUS_FULL;
114 else
115 val->intval = POWER_SUPPLY_STATUS_CHARGING;
116 }
117
118 return 0;
119}
120
121static int olpc_bat_get_health(union power_supply_propval *val)
122{
123 uint8_t ec_byte;
124 int ret;
125
126 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
127 if (ret)
128 return ret;
129
130 switch (ec_byte) {
131 case 0:
132 val->intval = POWER_SUPPLY_HEALTH_GOOD;
133 break;
134
135 case BAT_ERR_OVERTEMP:
136 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
137 break;
138
139 case BAT_ERR_OVERVOLTAGE:
140 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
141 break;
142
143 case BAT_ERR_INFOFAIL:
144 case BAT_ERR_OUT_OF_CONTROL:
145 case BAT_ERR_ID_FAIL:
146 case BAT_ERR_ACR_FAIL:
147 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
148 break;
149
150 default:
151
152 ret = -EIO;
153 }
154
155 return ret;
156}
157
158static int olpc_bat_get_mfr(union power_supply_propval *val)
159{
160 uint8_t ec_byte;
161 int ret;
162
163 ec_byte = BAT_ADDR_MFR_TYPE;
164 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
165 if (ret)
166 return ret;
167
168 switch (ec_byte >> 4) {
169 case 1:
170 val->strval = "Gold Peak";
171 break;
172 case 2:
173 val->strval = "BYD";
174 break;
175 default:
176 val->strval = "Unknown";
177 break;
178 }
179
180 return ret;
181}
182
183static int olpc_bat_get_tech(union power_supply_propval *val)
184{
185 uint8_t ec_byte;
186 int ret;
187
188 ec_byte = BAT_ADDR_MFR_TYPE;
189 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
190 if (ret)
191 return ret;
192
193 switch (ec_byte & 0xf) {
194 case 1:
195 val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
196 break;
197 case 2:
198 val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe;
199 break;
200 default:
201 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
202 break;
203 }
204
205 return ret;
206}
207
208static int olpc_bat_get_charge_full_design(union power_supply_propval *val)
209{
210 uint8_t ec_byte;
211 union power_supply_propval tech;
212 int ret, mfr;
213
214 ret = olpc_bat_get_tech(&tech);
215 if (ret)
216 return ret;
217
218 ec_byte = BAT_ADDR_MFR_TYPE;
219 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
220 if (ret)
221 return ret;
222
223 mfr = ec_byte >> 4;
224
225 switch (tech.intval) {
226 case POWER_SUPPLY_TECHNOLOGY_NiMH:
227 switch (mfr) {
228 case 1:
229 val->intval = 3000000*.8;
230 break;
231 default:
232 return -EIO;
233 }
234 break;
235
236 case POWER_SUPPLY_TECHNOLOGY_LiFe:
237 switch (mfr) {
238 case 1:
239 case 2:
240 val->intval = 2800000;
241 break;
242 default:
243 return -EIO;
244 }
245 break;
246
247 default:
248 return -EIO;
249 }
250
251 return ret;
252}
253
254static int olpc_bat_get_charge_now(union power_supply_propval *val)
255{
256 uint8_t soc;
257 union power_supply_propval full;
258 int ret;
259
260 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &soc, 1);
261 if (ret)
262 return ret;
263
264 ret = olpc_bat_get_charge_full_design(&full);
265 if (ret)
266 return ret;
267
268 val->intval = soc * (full.intval / 100);
269 return 0;
270}
271
272static int olpc_bat_get_voltage_max_design(union power_supply_propval *val)
273{
274 uint8_t ec_byte;
275 union power_supply_propval tech;
276 int mfr;
277 int ret;
278
279 ret = olpc_bat_get_tech(&tech);
280 if (ret)
281 return ret;
282
283 ec_byte = BAT_ADDR_MFR_TYPE;
284 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
285 if (ret)
286 return ret;
287
288 mfr = ec_byte >> 4;
289
290 switch (tech.intval) {
291 case POWER_SUPPLY_TECHNOLOGY_NiMH:
292 switch (mfr) {
293 case 1:
294 val->intval = 6000000;
295 break;
296 default:
297 return -EIO;
298 }
299 break;
300
301 case POWER_SUPPLY_TECHNOLOGY_LiFe:
302 switch (mfr) {
303 case 1:
304 val->intval = 6400000;
305 break;
306 case 2:
307 val->intval = 6500000;
308 break;
309 default:
310 return -EIO;
311 }
312 break;
313
314 default:
315 return -EIO;
316 }
317
318 return ret;
319}
320
321
322
323
324static int olpc_bat_get_property(struct power_supply *psy,
325 enum power_supply_property psp,
326 union power_supply_propval *val)
327{
328 int ret = 0;
329 __be16 ec_word;
330 uint8_t ec_byte;
331 __be64 ser_buf;
332
333 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
334 if (ret)
335 return ret;
336
337
338
339
340
341
342
343 if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) &&
344 psp != POWER_SUPPLY_PROP_PRESENT)
345 return -ENODEV;
346
347 switch (psp) {
348 case POWER_SUPPLY_PROP_STATUS:
349 ret = olpc_bat_get_status(val, ec_byte);
350 if (ret)
351 return ret;
352 break;
353 case POWER_SUPPLY_PROP_CHARGE_TYPE:
354 if (ec_byte & BAT_STAT_TRICKLE)
355 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
356 else if (ec_byte & BAT_STAT_CHARGING)
357 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
358 else
359 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
360 break;
361 case POWER_SUPPLY_PROP_PRESENT:
362 val->intval = !!(ec_byte & (BAT_STAT_PRESENT |
363 BAT_STAT_TRICKLE));
364 break;
365
366 case POWER_SUPPLY_PROP_HEALTH:
367 if (ec_byte & BAT_STAT_DESTROY)
368 val->intval = POWER_SUPPLY_HEALTH_DEAD;
369 else {
370 ret = olpc_bat_get_health(val);
371 if (ret)
372 return ret;
373 }
374 break;
375
376 case POWER_SUPPLY_PROP_MANUFACTURER:
377 ret = olpc_bat_get_mfr(val);
378 if (ret)
379 return ret;
380 break;
381 case POWER_SUPPLY_PROP_TECHNOLOGY:
382 ret = olpc_bat_get_tech(val);
383 if (ret)
384 return ret;
385 break;
386 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
387 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
388 ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
389 if (ret)
390 return ret;
391
392 val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32;
393 break;
394 case POWER_SUPPLY_PROP_CURRENT_AVG:
395 case POWER_SUPPLY_PROP_CURRENT_NOW:
396 ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
397 if (ret)
398 return ret;
399
400 val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120;
401 break;
402 case POWER_SUPPLY_PROP_CAPACITY:
403 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
404 if (ret)
405 return ret;
406 val->intval = ec_byte;
407 break;
408 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
409 if (ec_byte & BAT_STAT_FULL)
410 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
411 else if (ec_byte & BAT_STAT_LOW)
412 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
413 else
414 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
415 break;
416 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
417 ret = olpc_bat_get_charge_full_design(val);
418 if (ret)
419 return ret;
420 break;
421 case POWER_SUPPLY_PROP_CHARGE_NOW:
422 ret = olpc_bat_get_charge_now(val);
423 if (ret)
424 return ret;
425 break;
426 case POWER_SUPPLY_PROP_TEMP:
427 ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
428 if (ret)
429 return ret;
430
431 val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256;
432 break;
433 case POWER_SUPPLY_PROP_TEMP_AMBIENT:
434 ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
435 if (ret)
436 return ret;
437
438 val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
439 break;
440 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
441 ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
442 if (ret)
443 return ret;
444
445 val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15;
446 break;
447 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
448 ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
449 if (ret)
450 return ret;
451
452 sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
453 val->strval = bat_serial;
454 break;
455 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
456 ret = olpc_bat_get_voltage_max_design(val);
457 if (ret)
458 return ret;
459 break;
460 default:
461 ret = -EINVAL;
462 break;
463 }
464
465 return ret;
466}
467
468static enum power_supply_property olpc_xo1_bat_props[] = {
469 POWER_SUPPLY_PROP_STATUS,
470 POWER_SUPPLY_PROP_CHARGE_TYPE,
471 POWER_SUPPLY_PROP_PRESENT,
472 POWER_SUPPLY_PROP_HEALTH,
473 POWER_SUPPLY_PROP_TECHNOLOGY,
474 POWER_SUPPLY_PROP_VOLTAGE_AVG,
475 POWER_SUPPLY_PROP_VOLTAGE_NOW,
476 POWER_SUPPLY_PROP_CURRENT_AVG,
477 POWER_SUPPLY_PROP_CURRENT_NOW,
478 POWER_SUPPLY_PROP_CAPACITY,
479 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
480 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
481 POWER_SUPPLY_PROP_CHARGE_NOW,
482 POWER_SUPPLY_PROP_TEMP,
483 POWER_SUPPLY_PROP_TEMP_AMBIENT,
484 POWER_SUPPLY_PROP_MANUFACTURER,
485 POWER_SUPPLY_PROP_SERIAL_NUMBER,
486 POWER_SUPPLY_PROP_CHARGE_COUNTER,
487 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
488};
489
490
491static enum power_supply_property olpc_xo15_bat_props[] = {
492 POWER_SUPPLY_PROP_STATUS,
493 POWER_SUPPLY_PROP_CHARGE_TYPE,
494 POWER_SUPPLY_PROP_PRESENT,
495 POWER_SUPPLY_PROP_HEALTH,
496 POWER_SUPPLY_PROP_TECHNOLOGY,
497 POWER_SUPPLY_PROP_VOLTAGE_AVG,
498 POWER_SUPPLY_PROP_VOLTAGE_NOW,
499 POWER_SUPPLY_PROP_CURRENT_AVG,
500 POWER_SUPPLY_PROP_CURRENT_NOW,
501 POWER_SUPPLY_PROP_CAPACITY,
502 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
503 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
504 POWER_SUPPLY_PROP_CHARGE_NOW,
505 POWER_SUPPLY_PROP_TEMP,
506 POWER_SUPPLY_PROP_MANUFACTURER,
507 POWER_SUPPLY_PROP_SERIAL_NUMBER,
508 POWER_SUPPLY_PROP_CHARGE_COUNTER,
509 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
510};
511
512
513
514#define EEPROM_START 0x20
515#define EEPROM_END 0x80
516#define EEPROM_SIZE (EEPROM_END - EEPROM_START)
517
518static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj,
519 struct bin_attribute *attr, char *buf, loff_t off, size_t count)
520{
521 uint8_t ec_byte;
522 int ret;
523 int i;
524
525 for (i = 0; i < count; i++) {
526 ec_byte = EEPROM_START + off + i;
527 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1);
528 if (ret) {
529 pr_err("olpc-battery: "
530 "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n",
531 ec_byte, ret);
532 return -EIO;
533 }
534 }
535
536 return count;
537}
538
539static const struct bin_attribute olpc_bat_eeprom = {
540 .attr = {
541 .name = "eeprom",
542 .mode = S_IRUGO,
543 },
544 .size = EEPROM_SIZE,
545 .read = olpc_bat_eeprom_read,
546};
547
548
549
550static ssize_t olpc_bat_error_read(struct device *dev,
551 struct device_attribute *attr, char *buf)
552{
553 uint8_t ec_byte;
554 ssize_t ret;
555
556 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
557 if (ret < 0)
558 return ret;
559
560 return sprintf(buf, "%d\n", ec_byte);
561}
562
563static const struct device_attribute olpc_bat_error = {
564 .attr = {
565 .name = "error",
566 .mode = S_IRUGO,
567 },
568 .show = olpc_bat_error_read,
569};
570
571
572
573
574
575static struct power_supply_desc olpc_bat_desc = {
576 .name = "olpc-battery",
577 .get_property = olpc_bat_get_property,
578 .use_for_apm = 1,
579};
580
581static struct power_supply *olpc_bat;
582
583static int olpc_battery_suspend(struct platform_device *pdev,
584 pm_message_t state)
585{
586 if (device_may_wakeup(&olpc_ac->dev))
587 olpc_ec_wakeup_set(EC_SCI_SRC_ACPWR);
588 else
589 olpc_ec_wakeup_clear(EC_SCI_SRC_ACPWR);
590
591 if (device_may_wakeup(&olpc_bat->dev))
592 olpc_ec_wakeup_set(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
593 | EC_SCI_SRC_BATERR);
594 else
595 olpc_ec_wakeup_clear(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
596 | EC_SCI_SRC_BATERR);
597
598 return 0;
599}
600
601static int olpc_battery_probe(struct platform_device *pdev)
602{
603 int ret;
604 uint8_t status;
605
606
607
608
609
610 if (olpc_platform_info.ecver < 0x44) {
611 printk(KERN_NOTICE "OLPC EC version 0x%02x too old for "
612 "battery driver.\n", olpc_platform_info.ecver);
613 return -ENXIO;
614 }
615
616 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
617 if (ret)
618 return ret;
619
620
621
622 olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc, NULL);
623 if (IS_ERR(olpc_ac))
624 return PTR_ERR(olpc_ac);
625
626 if (olpc_board_at_least(olpc_board_pre(0xd0))) {
627 olpc_bat_desc.properties = olpc_xo15_bat_props;
628 olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo15_bat_props);
629 } else {
630 olpc_bat_desc.properties = olpc_xo1_bat_props;
631 olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
632 }
633
634 olpc_bat = power_supply_register(&pdev->dev, &olpc_bat_desc, NULL);
635 if (IS_ERR(olpc_bat)) {
636 ret = PTR_ERR(olpc_bat);
637 goto battery_failed;
638 }
639
640 ret = device_create_bin_file(&olpc_bat->dev, &olpc_bat_eeprom);
641 if (ret)
642 goto eeprom_failed;
643
644 ret = device_create_file(&olpc_bat->dev, &olpc_bat_error);
645 if (ret)
646 goto error_failed;
647
648 if (olpc_ec_wakeup_available()) {
649 device_set_wakeup_capable(&olpc_ac->dev, true);
650 device_set_wakeup_capable(&olpc_bat->dev, true);
651 }
652
653 return 0;
654
655error_failed:
656 device_remove_bin_file(&olpc_bat->dev, &olpc_bat_eeprom);
657eeprom_failed:
658 power_supply_unregister(olpc_bat);
659battery_failed:
660 power_supply_unregister(olpc_ac);
661 return ret;
662}
663
664static int olpc_battery_remove(struct platform_device *pdev)
665{
666 device_remove_file(&olpc_bat->dev, &olpc_bat_error);
667 device_remove_bin_file(&olpc_bat->dev, &olpc_bat_eeprom);
668 power_supply_unregister(olpc_bat);
669 power_supply_unregister(olpc_ac);
670 return 0;
671}
672
673static const struct of_device_id olpc_battery_ids[] = {
674 { .compatible = "olpc,xo1-battery" },
675 {}
676};
677MODULE_DEVICE_TABLE(of, olpc_battery_ids);
678
679static struct platform_driver olpc_battery_driver = {
680 .driver = {
681 .name = "olpc-battery",
682 .of_match_table = olpc_battery_ids,
683 },
684 .probe = olpc_battery_probe,
685 .remove = olpc_battery_remove,
686 .suspend = olpc_battery_suspend,
687};
688
689module_platform_driver(olpc_battery_driver);
690
691MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
692MODULE_LICENSE("GPL");
693MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");
694
