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 | |
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, inlen: 0, outbuf: &status, outlen: 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 | |
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 | |
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, inlen: 0, outbuf: &ec_byte, outlen: 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 | |
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, inbuf: &ec_byte, inlen: 1, outbuf: &ec_byte, outlen: 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 | |
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, inbuf: &ec_byte, inlen: 1, outbuf: &ec_byte, outlen: 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 | |
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(val: &tech); |
217 | if (ret) |
218 | return ret; |
219 | |
220 | ec_byte = BAT_ADDR_MFR_TYPE; |
221 | ret = olpc_ec_cmd(EC_BAT_EEPROM, inbuf: &ec_byte, inlen: 1, outbuf: &ec_byte, outlen: 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 | |
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, inlen: 0, outbuf: &soc, outlen: 1); |
263 | if (ret) |
264 | return ret; |
265 | |
266 | ret = olpc_bat_get_charge_full_design(val: &full); |
267 | if (ret) |
268 | return ret; |
269 | |
270 | val->intval = soc * (full.intval / 100); |
271 | return 0; |
272 | } |
273 | |
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(val: &tech); |
282 | if (ret) |
283 | return ret; |
284 | |
285 | ec_byte = BAT_ADDR_MFR_TYPE; |
286 | ret = olpc_ec_cmd(EC_BAT_EEPROM, inbuf: &ec_byte, inlen: 1, outbuf: &ec_byte, outlen: 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 | |
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 | *********************************************************************/ |
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, inlen: 0, outbuf: &ec_byte, outlen: 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, inlen: 0, outbuf: (void *)&ec_word, outlen: 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, inlen: 0, outbuf: (void *)&ec_word, outlen: 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, inlen: 0, outbuf: &ec_byte, outlen: 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, inlen: 0, outbuf: (void *)&ec_word, outlen: 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, inlen: 0, outbuf: (void *)&ec_word, outlen: 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, inlen: 0, outbuf: (void *)&ec_word, outlen: 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, inlen: 0, outbuf: (void *)&ser_buf, outlen: 8); |
460 | if (ret) |
461 | return ret; |
462 | |
463 | sprintf(buf: data->bat_serial, fmt: "%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 | |
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, inbuf: &ec_byte, inlen: 1, outbuf: &buf[i], outlen: 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 | |
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, inlen: 0, outbuf: &ec_byte, outlen: 1); |
568 | if (ret < 0) |
569 | return ret; |
570 | |
571 | return sysfs_emit(buf, fmt: "%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 | |
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(dev: &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(dev: &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 | |
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 | struct device_node *np; |
639 | uint8_t status; |
640 | uint8_t ecver; |
641 | int ret; |
642 | |
643 | data = devm_kzalloc(dev: &pdev->dev, size: sizeof(*data), GFP_KERNEL); |
644 | if (!data) |
645 | return -ENOMEM; |
646 | platform_set_drvdata(pdev, data); |
647 | |
648 | /* See if the EC is already there and get the EC revision */ |
649 | ret = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, inlen: 0, outbuf: &ecver, outlen: 1); |
650 | if (ret) |
651 | return ret; |
652 | |
653 | np = of_find_compatible_node(NULL, NULL, compat: "olpc,xo1.75-ec" ); |
654 | if (np) { |
655 | of_node_put(node: np); |
656 | /* XO 1.75 */ |
657 | data->new_proto = true; |
658 | data->little_endian = true; |
659 | } else if (ecver > 0x44) { |
660 | /* XO 1 or 1.5 with a new EC firmware. */ |
661 | data->new_proto = true; |
662 | } else if (ecver < 0x44) { |
663 | /* |
664 | * We've seen a number of EC protocol changes; this driver |
665 | * requires the latest EC protocol, supported by 0x44 and above. |
666 | */ |
667 | printk(KERN_NOTICE "OLPC EC version 0x%02x too old for " |
668 | "battery driver.\n" , ecver); |
669 | return -ENXIO; |
670 | } |
671 | |
672 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, inlen: 0, outbuf: &status, outlen: 1); |
673 | if (ret) |
674 | return ret; |
675 | |
676 | /* Ignore the status. It doesn't actually matter */ |
677 | |
678 | ac_psy_cfg.of_node = pdev->dev.of_node; |
679 | ac_psy_cfg.drv_data = data; |
680 | |
681 | data->olpc_ac = devm_power_supply_register(parent: &pdev->dev, desc: &olpc_ac_desc, |
682 | cfg: &ac_psy_cfg); |
683 | if (IS_ERR(ptr: data->olpc_ac)) |
684 | return PTR_ERR(ptr: data->olpc_ac); |
685 | |
686 | if (of_device_is_compatible(device: pdev->dev.of_node, "olpc,xo1.5-battery" )) { |
687 | /* XO-1.5 */ |
688 | olpc_bat_desc.properties = olpc_xo15_bat_props; |
689 | olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo15_bat_props); |
690 | } else { |
691 | /* XO-1 */ |
692 | olpc_bat_desc.properties = olpc_xo1_bat_props; |
693 | olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props); |
694 | } |
695 | |
696 | bat_psy_cfg.of_node = pdev->dev.of_node; |
697 | bat_psy_cfg.drv_data = data; |
698 | bat_psy_cfg.attr_grp = olpc_bat_sysfs_groups; |
699 | |
700 | data->olpc_bat = devm_power_supply_register(parent: &pdev->dev, desc: &olpc_bat_desc, |
701 | cfg: &bat_psy_cfg); |
702 | if (IS_ERR(ptr: data->olpc_bat)) |
703 | return PTR_ERR(ptr: data->olpc_bat); |
704 | |
705 | if (olpc_ec_wakeup_available()) { |
706 | device_set_wakeup_capable(dev: &data->olpc_ac->dev, capable: true); |
707 | device_set_wakeup_capable(dev: &data->olpc_bat->dev, capable: true); |
708 | } |
709 | |
710 | return 0; |
711 | } |
712 | |
713 | static const struct of_device_id olpc_battery_ids[] = { |
714 | { .compatible = "olpc,xo1-battery" }, |
715 | { .compatible = "olpc,xo1.5-battery" }, |
716 | {} |
717 | }; |
718 | MODULE_DEVICE_TABLE(of, olpc_battery_ids); |
719 | |
720 | static struct platform_driver olpc_battery_driver = { |
721 | .driver = { |
722 | .name = "olpc-battery" , |
723 | .of_match_table = olpc_battery_ids, |
724 | }, |
725 | .probe = olpc_battery_probe, |
726 | .suspend = olpc_battery_suspend, |
727 | }; |
728 | |
729 | module_platform_driver(olpc_battery_driver); |
730 | |
731 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>" ); |
732 | MODULE_LICENSE("GPL" ); |
733 | MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine" ); |
734 | |