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