1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Battery driver for One Laptop Per Child board.
4 *
5 * Copyright © 2006-2010 David Woodhouse <dwmw2@infradead.org>
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/mod_devicetable.h>
11 #include <linux/types.h>
12 #include <linux/err.h>
13 #include <linux/device.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/power_supply.h>
17 #include <linux/jiffies.h>
18 #include <linux/sched.h>
19 #include <linux/olpc-ec.h>
20
21
22 #define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */
23 #define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */
24 #define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */
25 #define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */
26 #define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */
27 #define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */
28 #define EC_BAT_SOC 0x16 /* uint8_t, percentage */
29 #define EC_BAT_SERIAL 0x17 /* uint8_t[6] */
30 #define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */
31 #define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */
32
33 #define BAT_STAT_PRESENT 0x01
34 #define BAT_STAT_FULL 0x02
35 #define BAT_STAT_LOW 0x04
36 #define BAT_STAT_DESTROY 0x08
37 #define BAT_STAT_AC 0x10
38 #define BAT_STAT_CHARGING 0x20
39 #define BAT_STAT_DISCHARGING 0x40
40 #define BAT_STAT_TRICKLE 0x80
41
42 #define BAT_ERR_INFOFAIL 0x02
43 #define BAT_ERR_OVERVOLTAGE 0x04
44 #define BAT_ERR_OVERTEMP 0x05
45 #define BAT_ERR_GAUGESTOP 0x06
46 #define BAT_ERR_OUT_OF_CONTROL 0x07
47 #define BAT_ERR_ID_FAIL 0x09
48 #define BAT_ERR_ACR_FAIL 0x10
49
50 #define BAT_ADDR_MFR_TYPE 0x5F
51
52 struct olpc_battery_data {
53 struct power_supply *olpc_ac;
54 struct power_supply *olpc_bat;
55 char bat_serial[17];
56 bool new_proto;
57 bool little_endian;
58 };
59
60 /*********************************************************************
61 * Power
62 *********************************************************************/
63
olpc_ac_get_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)64 static int olpc_ac_get_prop(struct power_supply *psy,
65 enum power_supply_property psp,
66 union power_supply_propval *val)
67 {
68 int ret = 0;
69 uint8_t status;
70
71 switch (psp) {
72 case POWER_SUPPLY_PROP_ONLINE:
73 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
74 if (ret)
75 return ret;
76
77 val->intval = !!(status & BAT_STAT_AC);
78 break;
79 default:
80 ret = -EINVAL;
81 break;
82 }
83 return ret;
84 }
85
86 static enum power_supply_property olpc_ac_props[] = {
87 POWER_SUPPLY_PROP_ONLINE,
88 };
89
90 static const struct power_supply_desc olpc_ac_desc = {
91 .name = "olpc_ac",
92 .type = POWER_SUPPLY_TYPE_MAINS,
93 .properties = olpc_ac_props,
94 .num_properties = ARRAY_SIZE(olpc_ac_props),
95 .get_property = olpc_ac_get_prop,
96 };
97
olpc_bat_get_status(struct olpc_battery_data * data,union power_supply_propval * val,uint8_t ec_byte)98 static int olpc_bat_get_status(struct olpc_battery_data *data,
99 union power_supply_propval *val, uint8_t ec_byte)
100 {
101 if (data->new_proto) {
102 if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
103 val->intval = POWER_SUPPLY_STATUS_CHARGING;
104 else if (ec_byte & BAT_STAT_DISCHARGING)
105 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
106 else if (ec_byte & BAT_STAT_FULL)
107 val->intval = POWER_SUPPLY_STATUS_FULL;
108 else /* er,... */
109 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
110 } else {
111 /* Older EC didn't report charge/discharge bits */
112 if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */
113 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
114 else if (ec_byte & BAT_STAT_FULL)
115 val->intval = POWER_SUPPLY_STATUS_FULL;
116 else /* Not _necessarily_ true but EC doesn't tell all yet */
117 val->intval = POWER_SUPPLY_STATUS_CHARGING;
118 }
119
120 return 0;
121 }
122
olpc_bat_get_health(union power_supply_propval * val)123 static int olpc_bat_get_health(union power_supply_propval *val)
124 {
125 uint8_t ec_byte;
126 int ret;
127
128 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
129 if (ret)
130 return ret;
131
132 switch (ec_byte) {
133 case 0:
134 val->intval = POWER_SUPPLY_HEALTH_GOOD;
135 break;
136
137 case BAT_ERR_OVERTEMP:
138 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
139 break;
140
141 case BAT_ERR_OVERVOLTAGE:
142 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
143 break;
144
145 case BAT_ERR_INFOFAIL:
146 case BAT_ERR_OUT_OF_CONTROL:
147 case BAT_ERR_ID_FAIL:
148 case BAT_ERR_ACR_FAIL:
149 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
150 break;
151
152 default:
153 /* Eep. We don't know this failure code */
154 ret = -EIO;
155 }
156
157 return ret;
158 }
159
olpc_bat_get_mfr(union power_supply_propval * val)160 static int olpc_bat_get_mfr(union power_supply_propval *val)
161 {
162 uint8_t ec_byte;
163 int ret;
164
165 ec_byte = BAT_ADDR_MFR_TYPE;
166 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
167 if (ret)
168 return ret;
169
170 switch (ec_byte >> 4) {
171 case 1:
172 val->strval = "Gold Peak";
173 break;
174 case 2:
175 val->strval = "BYD";
176 break;
177 default:
178 val->strval = "Unknown";
179 break;
180 }
181
182 return ret;
183 }
184
olpc_bat_get_tech(union power_supply_propval * val)185 static int olpc_bat_get_tech(union power_supply_propval *val)
186 {
187 uint8_t ec_byte;
188 int ret;
189
190 ec_byte = BAT_ADDR_MFR_TYPE;
191 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
192 if (ret)
193 return ret;
194
195 switch (ec_byte & 0xf) {
196 case 1:
197 val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
198 break;
199 case 2:
200 val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe;
201 break;
202 default:
203 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
204 break;
205 }
206
207 return ret;
208 }
209
olpc_bat_get_charge_full_design(union power_supply_propval * val)210 static int olpc_bat_get_charge_full_design(union power_supply_propval *val)
211 {
212 uint8_t ec_byte;
213 union power_supply_propval tech;
214 int ret, mfr;
215
216 ret = olpc_bat_get_tech(&tech);
217 if (ret)
218 return ret;
219
220 ec_byte = BAT_ADDR_MFR_TYPE;
221 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
222 if (ret)
223 return ret;
224
225 mfr = ec_byte >> 4;
226
227 switch (tech.intval) {
228 case POWER_SUPPLY_TECHNOLOGY_NiMH:
229 switch (mfr) {
230 case 1: /* Gold Peak */
231 val->intval = 3000000*.8;
232 break;
233 default:
234 return -EIO;
235 }
236 break;
237
238 case POWER_SUPPLY_TECHNOLOGY_LiFe:
239 switch (mfr) {
240 case 1: /* Gold Peak, fall through */
241 case 2: /* BYD */
242 val->intval = 2800000;
243 break;
244 default:
245 return -EIO;
246 }
247 break;
248
249 default:
250 return -EIO;
251 }
252
253 return ret;
254 }
255
olpc_bat_get_charge_now(union power_supply_propval * val)256 static int olpc_bat_get_charge_now(union power_supply_propval *val)
257 {
258 uint8_t soc;
259 union power_supply_propval full;
260 int ret;
261
262 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &soc, 1);
263 if (ret)
264 return ret;
265
266 ret = olpc_bat_get_charge_full_design(&full);
267 if (ret)
268 return ret;
269
270 val->intval = soc * (full.intval / 100);
271 return 0;
272 }
273
olpc_bat_get_voltage_max_design(union power_supply_propval * val)274 static int olpc_bat_get_voltage_max_design(union power_supply_propval *val)
275 {
276 uint8_t ec_byte;
277 union power_supply_propval tech;
278 int mfr;
279 int ret;
280
281 ret = olpc_bat_get_tech(&tech);
282 if (ret)
283 return ret;
284
285 ec_byte = BAT_ADDR_MFR_TYPE;
286 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
287 if (ret)
288 return ret;
289
290 mfr = ec_byte >> 4;
291
292 switch (tech.intval) {
293 case POWER_SUPPLY_TECHNOLOGY_NiMH:
294 switch (mfr) {
295 case 1: /* Gold Peak */
296 val->intval = 6000000;
297 break;
298 default:
299 return -EIO;
300 }
301 break;
302
303 case POWER_SUPPLY_TECHNOLOGY_LiFe:
304 switch (mfr) {
305 case 1: /* Gold Peak */
306 val->intval = 6400000;
307 break;
308 case 2: /* BYD */
309 val->intval = 6500000;
310 break;
311 default:
312 return -EIO;
313 }
314 break;
315
316 default:
317 return -EIO;
318 }
319
320 return ret;
321 }
322
ecword_to_cpu(struct olpc_battery_data * data,u16 ec_word)323 static u16 ecword_to_cpu(struct olpc_battery_data *data, u16 ec_word)
324 {
325 if (data->little_endian)
326 return le16_to_cpu((__force __le16)ec_word);
327 else
328 return be16_to_cpu((__force __be16)ec_word);
329 }
330
331 /*********************************************************************
332 * Battery properties
333 *********************************************************************/
olpc_bat_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)334 static int olpc_bat_get_property(struct power_supply *psy,
335 enum power_supply_property psp,
336 union power_supply_propval *val)
337 {
338 struct olpc_battery_data *data = power_supply_get_drvdata(psy);
339 int ret = 0;
340 u16 ec_word;
341 uint8_t ec_byte;
342 __be64 ser_buf;
343
344 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
345 if (ret)
346 return ret;
347
348 /* Theoretically there's a race here -- the battery could be
349 removed immediately after we check whether it's present, and
350 then we query for some other property of the now-absent battery.
351 It doesn't matter though -- the EC will return the last-known
352 information, and it's as if we just ran that _little_ bit faster
353 and managed to read it out before the battery went away. */
354 if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) &&
355 psp != POWER_SUPPLY_PROP_PRESENT)
356 return -ENODEV;
357
358 switch (psp) {
359 case POWER_SUPPLY_PROP_STATUS:
360 ret = olpc_bat_get_status(data, val, ec_byte);
361 if (ret)
362 return ret;
363 break;
364 case POWER_SUPPLY_PROP_CHARGE_TYPE:
365 if (ec_byte & BAT_STAT_TRICKLE)
366 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
367 else if (ec_byte & BAT_STAT_CHARGING)
368 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
369 else
370 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
371 break;
372 case POWER_SUPPLY_PROP_PRESENT:
373 val->intval = !!(ec_byte & (BAT_STAT_PRESENT |
374 BAT_STAT_TRICKLE));
375 break;
376
377 case POWER_SUPPLY_PROP_HEALTH:
378 if (ec_byte & BAT_STAT_DESTROY)
379 val->intval = POWER_SUPPLY_HEALTH_DEAD;
380 else {
381 ret = olpc_bat_get_health(val);
382 if (ret)
383 return ret;
384 }
385 break;
386
387 case POWER_SUPPLY_PROP_MANUFACTURER:
388 ret = olpc_bat_get_mfr(val);
389 if (ret)
390 return ret;
391 break;
392 case POWER_SUPPLY_PROP_TECHNOLOGY:
393 ret = olpc_bat_get_tech(val);
394 if (ret)
395 return ret;
396 break;
397 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
398 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
399 ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
400 if (ret)
401 return ret;
402
403 val->intval = ecword_to_cpu(data, ec_word) * 9760L / 32;
404 break;
405 case POWER_SUPPLY_PROP_CURRENT_AVG:
406 case POWER_SUPPLY_PROP_CURRENT_NOW:
407 ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
408 if (ret)
409 return ret;
410
411 val->intval = ecword_to_cpu(data, ec_word) * 15625L / 120;
412 break;
413 case POWER_SUPPLY_PROP_CAPACITY:
414 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
415 if (ret)
416 return ret;
417 val->intval = ec_byte;
418 break;
419 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
420 if (ec_byte & BAT_STAT_FULL)
421 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
422 else if (ec_byte & BAT_STAT_LOW)
423 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
424 else
425 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
426 break;
427 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
428 ret = olpc_bat_get_charge_full_design(val);
429 if (ret)
430 return ret;
431 break;
432 case POWER_SUPPLY_PROP_CHARGE_NOW:
433 ret = olpc_bat_get_charge_now(val);
434 if (ret)
435 return ret;
436 break;
437 case POWER_SUPPLY_PROP_TEMP:
438 ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
439 if (ret)
440 return ret;
441
442 val->intval = ecword_to_cpu(data, ec_word) * 10 / 256;
443 break;
444 case POWER_SUPPLY_PROP_TEMP_AMBIENT:
445 ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
446 if (ret)
447 return ret;
448
449 val->intval = (int)ecword_to_cpu(data, ec_word) * 10 / 256;
450 break;
451 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
452 ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
453 if (ret)
454 return ret;
455
456 val->intval = ecword_to_cpu(data, ec_word) * 6250 / 15;
457 break;
458 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
459 ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
460 if (ret)
461 return ret;
462
463 sprintf(data->bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
464 val->strval = data->bat_serial;
465 break;
466 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
467 ret = olpc_bat_get_voltage_max_design(val);
468 if (ret)
469 return ret;
470 break;
471 default:
472 ret = -EINVAL;
473 break;
474 }
475
476 return ret;
477 }
478
479 static enum power_supply_property olpc_xo1_bat_props[] = {
480 POWER_SUPPLY_PROP_STATUS,
481 POWER_SUPPLY_PROP_CHARGE_TYPE,
482 POWER_SUPPLY_PROP_PRESENT,
483 POWER_SUPPLY_PROP_HEALTH,
484 POWER_SUPPLY_PROP_TECHNOLOGY,
485 POWER_SUPPLY_PROP_VOLTAGE_AVG,
486 POWER_SUPPLY_PROP_VOLTAGE_NOW,
487 POWER_SUPPLY_PROP_CURRENT_AVG,
488 POWER_SUPPLY_PROP_CURRENT_NOW,
489 POWER_SUPPLY_PROP_CAPACITY,
490 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
491 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
492 POWER_SUPPLY_PROP_CHARGE_NOW,
493 POWER_SUPPLY_PROP_TEMP,
494 POWER_SUPPLY_PROP_TEMP_AMBIENT,
495 POWER_SUPPLY_PROP_MANUFACTURER,
496 POWER_SUPPLY_PROP_SERIAL_NUMBER,
497 POWER_SUPPLY_PROP_CHARGE_COUNTER,
498 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
499 };
500
501 /* XO-1.5 does not have ambient temperature property */
502 static enum power_supply_property olpc_xo15_bat_props[] = {
503 POWER_SUPPLY_PROP_STATUS,
504 POWER_SUPPLY_PROP_CHARGE_TYPE,
505 POWER_SUPPLY_PROP_PRESENT,
506 POWER_SUPPLY_PROP_HEALTH,
507 POWER_SUPPLY_PROP_TECHNOLOGY,
508 POWER_SUPPLY_PROP_VOLTAGE_AVG,
509 POWER_SUPPLY_PROP_VOLTAGE_NOW,
510 POWER_SUPPLY_PROP_CURRENT_AVG,
511 POWER_SUPPLY_PROP_CURRENT_NOW,
512 POWER_SUPPLY_PROP_CAPACITY,
513 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
514 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
515 POWER_SUPPLY_PROP_CHARGE_NOW,
516 POWER_SUPPLY_PROP_TEMP,
517 POWER_SUPPLY_PROP_MANUFACTURER,
518 POWER_SUPPLY_PROP_SERIAL_NUMBER,
519 POWER_SUPPLY_PROP_CHARGE_COUNTER,
520 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
521 };
522
523 /* EEPROM reading goes completely around the power_supply API, sadly */
524
525 #define EEPROM_START 0x20
526 #define EEPROM_END 0x80
527 #define EEPROM_SIZE (EEPROM_END - EEPROM_START)
528
olpc_bat_eeprom_read(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,char * buf,loff_t off,size_t count)529 static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj,
530 struct bin_attribute *attr, char *buf, loff_t off, size_t count)
531 {
532 uint8_t ec_byte;
533 int ret;
534 int i;
535
536 for (i = 0; i < count; i++) {
537 ec_byte = EEPROM_START + off + i;
538 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1);
539 if (ret) {
540 pr_err("olpc-battery: "
541 "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n",
542 ec_byte, ret);
543 return -EIO;
544 }
545 }
546
547 return count;
548 }
549
550 static struct bin_attribute olpc_bat_eeprom = {
551 .attr = {
552 .name = "eeprom",
553 .mode = S_IRUGO,
554 },
555 .size = EEPROM_SIZE,
556 .read = olpc_bat_eeprom_read,
557 };
558
559 /* Allow userspace to see the specific error value pulled from the EC */
560
olpc_bat_error_read(struct device * dev,struct device_attribute * attr,char * buf)561 static ssize_t olpc_bat_error_read(struct device *dev,
562 struct device_attribute *attr, char *buf)
563 {
564 uint8_t ec_byte;
565 ssize_t ret;
566
567 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
568 if (ret < 0)
569 return ret;
570
571 return sprintf(buf, "%d\n", ec_byte);
572 }
573
574 static struct device_attribute olpc_bat_error = {
575 .attr = {
576 .name = "error",
577 .mode = S_IRUGO,
578 },
579 .show = olpc_bat_error_read,
580 };
581
582 static struct attribute *olpc_bat_sysfs_attrs[] = {
583 &olpc_bat_error.attr,
584 NULL
585 };
586
587 static struct bin_attribute *olpc_bat_sysfs_bin_attrs[] = {
588 &olpc_bat_eeprom,
589 NULL
590 };
591
592 static const struct attribute_group olpc_bat_sysfs_group = {
593 .attrs = olpc_bat_sysfs_attrs,
594 .bin_attrs = olpc_bat_sysfs_bin_attrs,
595
596 };
597
598 static const struct attribute_group *olpc_bat_sysfs_groups[] = {
599 &olpc_bat_sysfs_group,
600 NULL
601 };
602
603 /*********************************************************************
604 * Initialisation
605 *********************************************************************/
606
607 static struct power_supply_desc olpc_bat_desc = {
608 .name = "olpc_battery",
609 .get_property = olpc_bat_get_property,
610 .use_for_apm = 1,
611 };
612
olpc_battery_suspend(struct platform_device * pdev,pm_message_t state)613 static int olpc_battery_suspend(struct platform_device *pdev,
614 pm_message_t state)
615 {
616 struct olpc_battery_data *data = platform_get_drvdata(pdev);
617
618 if (device_may_wakeup(&data->olpc_ac->dev))
619 olpc_ec_wakeup_set(EC_SCI_SRC_ACPWR);
620 else
621 olpc_ec_wakeup_clear(EC_SCI_SRC_ACPWR);
622
623 if (device_may_wakeup(&data->olpc_bat->dev))
624 olpc_ec_wakeup_set(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
625 | EC_SCI_SRC_BATERR);
626 else
627 olpc_ec_wakeup_clear(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
628 | EC_SCI_SRC_BATERR);
629
630 return 0;
631 }
632
olpc_battery_probe(struct platform_device * pdev)633 static int olpc_battery_probe(struct platform_device *pdev)
634 {
635 struct power_supply_config bat_psy_cfg = {};
636 struct power_supply_config ac_psy_cfg = {};
637 struct olpc_battery_data *data;
638 uint8_t status;
639 uint8_t ecver;
640 int ret;
641
642 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
643 if (!data)
644 return -ENOMEM;
645 platform_set_drvdata(pdev, data);
646
647 /* See if the EC is already there and get the EC revision */
648 ret = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0, &ecver, 1);
649 if (ret)
650 return ret;
651
652 if (of_find_compatible_node(NULL, NULL, "olpc,xo1.75-ec")) {
653 /* XO 1.75 */
654 data->new_proto = true;
655 data->little_endian = true;
656 } else if (ecver > 0x44) {
657 /* XO 1 or 1.5 with a new EC firmware. */
658 data->new_proto = true;
659 } else if (ecver < 0x44) {
660 /*
661 * We've seen a number of EC protocol changes; this driver
662 * requires the latest EC protocol, supported by 0x44 and above.
663 */
664 printk(KERN_NOTICE "OLPC EC version 0x%02x too old for "
665 "battery driver.\n", ecver);
666 return -ENXIO;
667 }
668
669 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
670 if (ret)
671 return ret;
672
673 /* Ignore the status. It doesn't actually matter */
674
675 ac_psy_cfg.of_node = pdev->dev.of_node;
676 ac_psy_cfg.drv_data = data;
677
678 data->olpc_ac = devm_power_supply_register(&pdev->dev, &olpc_ac_desc,
679 &ac_psy_cfg);
680 if (IS_ERR(data->olpc_ac))
681 return PTR_ERR(data->olpc_ac);
682
683 if (of_device_is_compatible(pdev->dev.of_node, "olpc,xo1.5-battery")) {
684 /* XO-1.5 */
685 olpc_bat_desc.properties = olpc_xo15_bat_props;
686 olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo15_bat_props);
687 } else {
688 /* XO-1 */
689 olpc_bat_desc.properties = olpc_xo1_bat_props;
690 olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
691 }
692
693 bat_psy_cfg.of_node = pdev->dev.of_node;
694 bat_psy_cfg.drv_data = data;
695 bat_psy_cfg.attr_grp = olpc_bat_sysfs_groups;
696
697 data->olpc_bat = devm_power_supply_register(&pdev->dev, &olpc_bat_desc,
698 &bat_psy_cfg);
699 if (IS_ERR(data->olpc_bat))
700 return PTR_ERR(data->olpc_bat);
701
702 if (olpc_ec_wakeup_available()) {
703 device_set_wakeup_capable(&data->olpc_ac->dev, true);
704 device_set_wakeup_capable(&data->olpc_bat->dev, true);
705 }
706
707 return 0;
708 }
709
710 static const struct of_device_id olpc_battery_ids[] = {
711 { .compatible = "olpc,xo1-battery" },
712 { .compatible = "olpc,xo1.5-battery" },
713 {}
714 };
715 MODULE_DEVICE_TABLE(of, olpc_battery_ids);
716
717 static struct platform_driver olpc_battery_driver = {
718 .driver = {
719 .name = "olpc-battery",
720 .of_match_table = olpc_battery_ids,
721 },
722 .probe = olpc_battery_probe,
723 .suspend = olpc_battery_suspend,
724 };
725
726 module_platform_driver(olpc_battery_driver);
727
728 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
729 MODULE_LICENSE("GPL");
730 MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");
731