Commit | Line | Data |
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fb972873 DW |
1 | /* |
2 | * Battery driver for One Laptop Per Child board. | |
3 | * | |
690e85a3 | 4 | * Copyright © 2006-2010 David Woodhouse <dwmw2@infradead.org> |
fb972873 DW |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
04a820ea | 11 | #include <linux/kernel.h> |
fb972873 | 12 | #include <linux/module.h> |
144bbeae | 13 | #include <linux/types.h> |
fb972873 | 14 | #include <linux/err.h> |
144bbeae | 15 | #include <linux/device.h> |
fb972873 DW |
16 | #include <linux/platform_device.h> |
17 | #include <linux/power_supply.h> | |
18 | #include <linux/jiffies.h> | |
19 | #include <linux/sched.h> | |
20 | #include <asm/olpc.h> | |
21 | ||
22 | ||
23 | #define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */ | |
24 | #define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */ | |
75d88079 | 25 | #define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */ |
fb972873 DW |
26 | #define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */ |
27 | #define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */ | |
28 | #define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */ | |
29 | #define EC_BAT_SOC 0x16 /* uint8_t, percentage */ | |
30 | #define EC_BAT_SERIAL 0x17 /* uint8_t[6] */ | |
31 | #define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */ | |
32 | #define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */ | |
33 | ||
34 | #define BAT_STAT_PRESENT 0x01 | |
35 | #define BAT_STAT_FULL 0x02 | |
36 | #define BAT_STAT_LOW 0x04 | |
37 | #define BAT_STAT_DESTROY 0x08 | |
38 | #define BAT_STAT_AC 0x10 | |
39 | #define BAT_STAT_CHARGING 0x20 | |
40 | #define BAT_STAT_DISCHARGING 0x40 | |
8f7e5798 | 41 | #define BAT_STAT_TRICKLE 0x80 |
fb972873 DW |
42 | |
43 | #define BAT_ERR_INFOFAIL 0x02 | |
44 | #define BAT_ERR_OVERVOLTAGE 0x04 | |
45 | #define BAT_ERR_OVERTEMP 0x05 | |
46 | #define BAT_ERR_GAUGESTOP 0x06 | |
47 | #define BAT_ERR_OUT_OF_CONTROL 0x07 | |
48 | #define BAT_ERR_ID_FAIL 0x09 | |
49 | #define BAT_ERR_ACR_FAIL 0x10 | |
50 | ||
51 | #define BAT_ADDR_MFR_TYPE 0x5F | |
52 | ||
53 | /********************************************************************* | |
54 | * Power | |
55 | *********************************************************************/ | |
56 | ||
57 | static int olpc_ac_get_prop(struct power_supply *psy, | |
58 | enum power_supply_property psp, | |
59 | union power_supply_propval *val) | |
60 | { | |
61 | int ret = 0; | |
62 | uint8_t status; | |
63 | ||
64 | switch (psp) { | |
65 | case POWER_SUPPLY_PROP_ONLINE: | |
66 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); | |
67 | if (ret) | |
68 | return ret; | |
69 | ||
70 | val->intval = !!(status & BAT_STAT_AC); | |
71 | break; | |
72 | default: | |
73 | ret = -EINVAL; | |
74 | break; | |
75 | } | |
76 | return ret; | |
77 | } | |
78 | ||
79 | static enum power_supply_property olpc_ac_props[] = { | |
80 | POWER_SUPPLY_PROP_ONLINE, | |
81 | }; | |
82 | ||
83 | static struct power_supply olpc_ac = { | |
84 | .name = "olpc-ac", | |
85 | .type = POWER_SUPPLY_TYPE_MAINS, | |
86 | .properties = olpc_ac_props, | |
87 | .num_properties = ARRAY_SIZE(olpc_ac_props), | |
88 | .get_property = olpc_ac_get_prop, | |
89 | }; | |
90 | ||
1ca5b9d2 DW |
91 | static char bat_serial[17]; /* Ick */ |
92 | ||
b2bd8a3b AS |
93 | static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte) |
94 | { | |
95 | if (olpc_platform_info.ecver > 0x44) { | |
8f7e5798 | 96 | if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE)) |
b2bd8a3b AS |
97 | val->intval = POWER_SUPPLY_STATUS_CHARGING; |
98 | else if (ec_byte & BAT_STAT_DISCHARGING) | |
99 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
100 | else if (ec_byte & BAT_STAT_FULL) | |
101 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
102 | else /* er,... */ | |
103 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
104 | } else { | |
105 | /* Older EC didn't report charge/discharge bits */ | |
106 | if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */ | |
107 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
108 | else if (ec_byte & BAT_STAT_FULL) | |
109 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
110 | else /* Not _necessarily_ true but EC doesn't tell all yet */ | |
111 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
112 | } | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static int olpc_bat_get_health(union power_supply_propval *val) | |
118 | { | |
119 | uint8_t ec_byte; | |
120 | int ret; | |
121 | ||
122 | ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); | |
123 | if (ret) | |
124 | return ret; | |
125 | ||
126 | switch (ec_byte) { | |
127 | case 0: | |
128 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
129 | break; | |
130 | ||
131 | case BAT_ERR_OVERTEMP: | |
132 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
133 | break; | |
134 | ||
135 | case BAT_ERR_OVERVOLTAGE: | |
136 | val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; | |
137 | break; | |
138 | ||
139 | case BAT_ERR_INFOFAIL: | |
140 | case BAT_ERR_OUT_OF_CONTROL: | |
141 | case BAT_ERR_ID_FAIL: | |
142 | case BAT_ERR_ACR_FAIL: | |
143 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
144 | break; | |
145 | ||
146 | default: | |
147 | /* Eep. We don't know this failure code */ | |
148 | ret = -EIO; | |
149 | } | |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
154 | static int olpc_bat_get_mfr(union power_supply_propval *val) | |
155 | { | |
156 | uint8_t ec_byte; | |
157 | int ret; | |
158 | ||
159 | ec_byte = BAT_ADDR_MFR_TYPE; | |
160 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); | |
161 | if (ret) | |
162 | return ret; | |
163 | ||
164 | switch (ec_byte >> 4) { | |
165 | case 1: | |
166 | val->strval = "Gold Peak"; | |
167 | break; | |
168 | case 2: | |
169 | val->strval = "BYD"; | |
170 | break; | |
171 | default: | |
172 | val->strval = "Unknown"; | |
173 | break; | |
174 | } | |
175 | ||
176 | return ret; | |
177 | } | |
178 | ||
179 | static int olpc_bat_get_tech(union power_supply_propval *val) | |
180 | { | |
181 | uint8_t ec_byte; | |
182 | int ret; | |
183 | ||
184 | ec_byte = BAT_ADDR_MFR_TYPE; | |
185 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); | |
186 | if (ret) | |
187 | return ret; | |
188 | ||
189 | switch (ec_byte & 0xf) { | |
190 | case 1: | |
191 | val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH; | |
192 | break; | |
193 | case 2: | |
194 | val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe; | |
195 | break; | |
196 | default: | |
197 | val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN; | |
198 | break; | |
199 | } | |
200 | ||
201 | return ret; | |
202 | } | |
203 | ||
b202a5e6 SS |
204 | static int olpc_bat_get_charge_full_design(union power_supply_propval *val) |
205 | { | |
206 | uint8_t ec_byte; | |
207 | union power_supply_propval tech; | |
208 | int ret, mfr; | |
209 | ||
210 | ret = olpc_bat_get_tech(&tech); | |
211 | if (ret) | |
212 | return ret; | |
213 | ||
214 | ec_byte = BAT_ADDR_MFR_TYPE; | |
215 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); | |
216 | if (ret) | |
217 | return ret; | |
218 | ||
219 | mfr = ec_byte >> 4; | |
220 | ||
221 | switch (tech.intval) { | |
222 | case POWER_SUPPLY_TECHNOLOGY_NiMH: | |
223 | switch (mfr) { | |
224 | case 1: /* Gold Peak */ | |
225 | val->intval = 3000000*.8; | |
226 | break; | |
227 | default: | |
228 | return -EIO; | |
229 | } | |
230 | break; | |
231 | ||
232 | case POWER_SUPPLY_TECHNOLOGY_LiFe: | |
233 | switch (mfr) { | |
234 | case 1: /* Gold Peak */ | |
235 | val->intval = 2800000; | |
236 | break; | |
237 | case 2: /* BYD */ | |
238 | val->intval = 3100000; | |
239 | break; | |
240 | default: | |
241 | return -EIO; | |
242 | } | |
243 | break; | |
244 | ||
245 | default: | |
246 | return -EIO; | |
247 | } | |
248 | ||
249 | return ret; | |
250 | } | |
251 | ||
20fd9830 SS |
252 | static int olpc_bat_get_charge_now(union power_supply_propval *val) |
253 | { | |
254 | uint8_t soc; | |
255 | union power_supply_propval full; | |
256 | int ret; | |
257 | ||
258 | ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &soc, 1); | |
259 | if (ret) | |
260 | return ret; | |
261 | ||
262 | ret = olpc_bat_get_charge_full_design(&full); | |
263 | if (ret) | |
264 | return ret; | |
265 | ||
266 | val->intval = soc * (full.intval / 100); | |
267 | return 0; | |
268 | } | |
269 | ||
fb972873 DW |
270 | /********************************************************************* |
271 | * Battery properties | |
272 | *********************************************************************/ | |
273 | static int olpc_bat_get_property(struct power_supply *psy, | |
274 | enum power_supply_property psp, | |
275 | union power_supply_propval *val) | |
276 | { | |
277 | int ret = 0; | |
8e9c7716 | 278 | __be16 ec_word; |
fb972873 | 279 | uint8_t ec_byte; |
8e9c7716 | 280 | __be64 ser_buf; |
fb972873 DW |
281 | |
282 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1); | |
283 | if (ret) | |
284 | return ret; | |
285 | ||
286 | /* Theoretically there's a race here -- the battery could be | |
287 | removed immediately after we check whether it's present, and | |
288 | then we query for some other property of the now-absent battery. | |
289 | It doesn't matter though -- the EC will return the last-known | |
290 | information, and it's as if we just ran that _little_ bit faster | |
291 | and managed to read it out before the battery went away. */ | |
8f7e5798 AS |
292 | if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) && |
293 | psp != POWER_SUPPLY_PROP_PRESENT) | |
fb972873 DW |
294 | return -ENODEV; |
295 | ||
296 | switch (psp) { | |
297 | case POWER_SUPPLY_PROP_STATUS: | |
b2bd8a3b AS |
298 | ret = olpc_bat_get_status(val, ec_byte); |
299 | if (ret) | |
300 | return ret; | |
301 | break; | |
ee8076ed AS |
302 | case POWER_SUPPLY_PROP_CHARGE_TYPE: |
303 | if (ec_byte & BAT_STAT_TRICKLE) | |
304 | val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; | |
305 | else if (ec_byte & BAT_STAT_CHARGING) | |
306 | val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; | |
307 | else | |
308 | val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; | |
309 | break; | |
fb972873 | 310 | case POWER_SUPPLY_PROP_PRESENT: |
8f7e5798 AS |
311 | val->intval = !!(ec_byte & (BAT_STAT_PRESENT | |
312 | BAT_STAT_TRICKLE)); | |
fb972873 DW |
313 | break; |
314 | ||
315 | case POWER_SUPPLY_PROP_HEALTH: | |
316 | if (ec_byte & BAT_STAT_DESTROY) | |
317 | val->intval = POWER_SUPPLY_HEALTH_DEAD; | |
318 | else { | |
b2bd8a3b | 319 | ret = olpc_bat_get_health(val); |
fb972873 DW |
320 | if (ret) |
321 | return ret; | |
fb972873 DW |
322 | } |
323 | break; | |
324 | ||
325 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
b2bd8a3b | 326 | ret = olpc_bat_get_mfr(val); |
fb972873 DW |
327 | if (ret) |
328 | return ret; | |
fb972873 DW |
329 | break; |
330 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
b2bd8a3b | 331 | ret = olpc_bat_get_tech(val); |
fb972873 DW |
332 | if (ret) |
333 | return ret; | |
fb972873 DW |
334 | break; |
335 | case POWER_SUPPLY_PROP_VOLTAGE_AVG: | |
22fadd76 | 336 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
fb972873 DW |
337 | ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2); |
338 | if (ret) | |
339 | return ret; | |
340 | ||
7cfbb294 | 341 | val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32; |
fb972873 DW |
342 | break; |
343 | case POWER_SUPPLY_PROP_CURRENT_AVG: | |
22fadd76 | 344 | case POWER_SUPPLY_PROP_CURRENT_NOW: |
fb972873 DW |
345 | ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2); |
346 | if (ret) | |
347 | return ret; | |
348 | ||
7cfbb294 | 349 | val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120; |
fb972873 DW |
350 | break; |
351 | case POWER_SUPPLY_PROP_CAPACITY: | |
352 | ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1); | |
353 | if (ret) | |
354 | return ret; | |
355 | val->intval = ec_byte; | |
356 | break; | |
b294a290 AS |
357 | case POWER_SUPPLY_PROP_CAPACITY_LEVEL: |
358 | if (ec_byte & BAT_STAT_FULL) | |
359 | val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; | |
360 | else if (ec_byte & BAT_STAT_LOW) | |
361 | val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; | |
362 | else | |
363 | val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; | |
364 | break; | |
b202a5e6 SS |
365 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: |
366 | ret = olpc_bat_get_charge_full_design(val); | |
367 | if (ret) | |
368 | return ret; | |
369 | break; | |
20fd9830 SS |
370 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
371 | ret = olpc_bat_get_charge_now(val); | |
372 | if (ret) | |
373 | return ret; | |
374 | break; | |
fb972873 DW |
375 | case POWER_SUPPLY_PROP_TEMP: |
376 | ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2); | |
377 | if (ret) | |
378 | return ret; | |
8e9c7716 | 379 | |
7cfbb294 | 380 | val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256; |
fb972873 DW |
381 | break; |
382 | case POWER_SUPPLY_PROP_TEMP_AMBIENT: | |
383 | ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2); | |
384 | if (ret) | |
385 | return ret; | |
386 | ||
8e9c7716 | 387 | val->intval = (int)be16_to_cpu(ec_word) * 100 / 256; |
fb972873 | 388 | break; |
8e552c36 AS |
389 | case POWER_SUPPLY_PROP_CHARGE_COUNTER: |
390 | ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2); | |
391 | if (ret) | |
392 | return ret; | |
393 | ||
7cfbb294 | 394 | val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15; |
8e552c36 | 395 | break; |
1ca5b9d2 DW |
396 | case POWER_SUPPLY_PROP_SERIAL_NUMBER: |
397 | ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8); | |
398 | if (ret) | |
399 | return ret; | |
400 | ||
401 | sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf)); | |
402 | val->strval = bat_serial; | |
403 | break; | |
fb972873 DW |
404 | default: |
405 | ret = -EINVAL; | |
406 | break; | |
407 | } | |
408 | ||
409 | return ret; | |
410 | } | |
411 | ||
c566d299 | 412 | static enum power_supply_property olpc_xo1_bat_props[] = { |
fb972873 | 413 | POWER_SUPPLY_PROP_STATUS, |
ee8076ed | 414 | POWER_SUPPLY_PROP_CHARGE_TYPE, |
fb972873 DW |
415 | POWER_SUPPLY_PROP_PRESENT, |
416 | POWER_SUPPLY_PROP_HEALTH, | |
417 | POWER_SUPPLY_PROP_TECHNOLOGY, | |
418 | POWER_SUPPLY_PROP_VOLTAGE_AVG, | |
22fadd76 | 419 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
fb972873 | 420 | POWER_SUPPLY_PROP_CURRENT_AVG, |
22fadd76 | 421 | POWER_SUPPLY_PROP_CURRENT_NOW, |
fb972873 | 422 | POWER_SUPPLY_PROP_CAPACITY, |
b294a290 | 423 | POWER_SUPPLY_PROP_CAPACITY_LEVEL, |
b202a5e6 | 424 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, |
20fd9830 | 425 | POWER_SUPPLY_PROP_CHARGE_NOW, |
fb972873 DW |
426 | POWER_SUPPLY_PROP_TEMP, |
427 | POWER_SUPPLY_PROP_TEMP_AMBIENT, | |
428 | POWER_SUPPLY_PROP_MANUFACTURER, | |
1ca5b9d2 | 429 | POWER_SUPPLY_PROP_SERIAL_NUMBER, |
8e552c36 | 430 | POWER_SUPPLY_PROP_CHARGE_COUNTER, |
fb972873 DW |
431 | }; |
432 | ||
c566d299 DD |
433 | /* XO-1.5 does not have ambient temperature property */ |
434 | static enum power_supply_property olpc_xo15_bat_props[] = { | |
435 | POWER_SUPPLY_PROP_STATUS, | |
436 | POWER_SUPPLY_PROP_CHARGE_TYPE, | |
437 | POWER_SUPPLY_PROP_PRESENT, | |
438 | POWER_SUPPLY_PROP_HEALTH, | |
439 | POWER_SUPPLY_PROP_TECHNOLOGY, | |
440 | POWER_SUPPLY_PROP_VOLTAGE_AVG, | |
bf542a4e | 441 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
c566d299 | 442 | POWER_SUPPLY_PROP_CURRENT_AVG, |
bf542a4e | 443 | POWER_SUPPLY_PROP_CURRENT_NOW, |
c566d299 DD |
444 | POWER_SUPPLY_PROP_CAPACITY, |
445 | POWER_SUPPLY_PROP_CAPACITY_LEVEL, | |
bf542a4e SS |
446 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, |
447 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
c566d299 DD |
448 | POWER_SUPPLY_PROP_TEMP, |
449 | POWER_SUPPLY_PROP_MANUFACTURER, | |
450 | POWER_SUPPLY_PROP_SERIAL_NUMBER, | |
451 | POWER_SUPPLY_PROP_CHARGE_COUNTER, | |
452 | }; | |
453 | ||
d7eb9e36 AS |
454 | /* EEPROM reading goes completely around the power_supply API, sadly */ |
455 | ||
456 | #define EEPROM_START 0x20 | |
457 | #define EEPROM_END 0x80 | |
458 | #define EEPROM_SIZE (EEPROM_END - EEPROM_START) | |
459 | ||
2c3c8bea | 460 | static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj, |
d7eb9e36 AS |
461 | struct bin_attribute *attr, char *buf, loff_t off, size_t count) |
462 | { | |
463 | uint8_t ec_byte; | |
04a820ea AS |
464 | int ret; |
465 | int i; | |
d7eb9e36 AS |
466 | |
467 | if (off >= EEPROM_SIZE) | |
468 | return 0; | |
469 | if (off + count > EEPROM_SIZE) | |
470 | count = EEPROM_SIZE - off; | |
471 | ||
04a820ea AS |
472 | for (i = 0; i < count; i++) { |
473 | ec_byte = EEPROM_START + off + i; | |
474 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1); | |
d7eb9e36 | 475 | if (ret) { |
04a820ea AS |
476 | pr_err("olpc-battery: " |
477 | "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n", | |
478 | ec_byte, ret); | |
d7eb9e36 AS |
479 | return -EIO; |
480 | } | |
481 | } | |
482 | ||
483 | return count; | |
484 | } | |
485 | ||
486 | static struct bin_attribute olpc_bat_eeprom = { | |
487 | .attr = { | |
488 | .name = "eeprom", | |
489 | .mode = S_IRUGO, | |
d7eb9e36 AS |
490 | }, |
491 | .size = 0, | |
492 | .read = olpc_bat_eeprom_read, | |
493 | }; | |
494 | ||
144bbeae AS |
495 | /* Allow userspace to see the specific error value pulled from the EC */ |
496 | ||
497 | static ssize_t olpc_bat_error_read(struct device *dev, | |
498 | struct device_attribute *attr, char *buf) | |
499 | { | |
500 | uint8_t ec_byte; | |
501 | ssize_t ret; | |
502 | ||
503 | ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); | |
504 | if (ret < 0) | |
505 | return ret; | |
506 | ||
507 | return sprintf(buf, "%d\n", ec_byte); | |
508 | } | |
509 | ||
510 | static struct device_attribute olpc_bat_error = { | |
511 | .attr = { | |
512 | .name = "error", | |
513 | .mode = S_IRUGO, | |
514 | }, | |
515 | .show = olpc_bat_error_read, | |
516 | }; | |
517 | ||
fb972873 DW |
518 | /********************************************************************* |
519 | * Initialisation | |
520 | *********************************************************************/ | |
521 | ||
522 | static struct platform_device *bat_pdev; | |
523 | ||
524 | static struct power_supply olpc_bat = { | |
fb972873 DW |
525 | .get_property = olpc_bat_get_property, |
526 | .use_for_apm = 1, | |
527 | }; | |
528 | ||
529 | void olpc_battery_trigger_uevent(unsigned long cause) | |
530 | { | |
531 | if (cause & EC_SCI_SRC_ACPWR) | |
532 | kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE); | |
533 | if (cause & (EC_SCI_SRC_BATERR|EC_SCI_SRC_BATSOC|EC_SCI_SRC_BATTERY)) | |
534 | kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE); | |
535 | } | |
536 | ||
537 | static int __init olpc_bat_init(void) | |
538 | { | |
539 | int ret = 0; | |
540 | uint8_t status; | |
541 | ||
542 | if (!olpc_platform_info.ecver) | |
543 | return -ENXIO; | |
484d6d50 AS |
544 | |
545 | /* | |
546 | * We've seen a number of EC protocol changes; this driver requires | |
547 | * the latest EC protocol, supported by 0x44 and above. | |
548 | */ | |
549 | if (olpc_platform_info.ecver < 0x44) { | |
550 | printk(KERN_NOTICE "OLPC EC version 0x%02x too old for " | |
551 | "battery driver.\n", olpc_platform_info.ecver); | |
fb972873 DW |
552 | return -ENXIO; |
553 | } | |
554 | ||
555 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); | |
556 | if (ret) | |
557 | return ret; | |
558 | ||
559 | /* Ignore the status. It doesn't actually matter */ | |
560 | ||
561 | bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0); | |
562 | if (IS_ERR(bat_pdev)) | |
563 | return PTR_ERR(bat_pdev); | |
564 | ||
565 | ret = power_supply_register(&bat_pdev->dev, &olpc_ac); | |
566 | if (ret) | |
567 | goto ac_failed; | |
568 | ||
569 | olpc_bat.name = bat_pdev->name; | |
c566d299 DD |
570 | if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */ |
571 | olpc_bat.properties = olpc_xo15_bat_props; | |
572 | olpc_bat.num_properties = ARRAY_SIZE(olpc_xo15_bat_props); | |
573 | } else { /* XO-1 */ | |
574 | olpc_bat.properties = olpc_xo1_bat_props; | |
575 | olpc_bat.num_properties = ARRAY_SIZE(olpc_xo1_bat_props); | |
576 | } | |
fb972873 DW |
577 | |
578 | ret = power_supply_register(&bat_pdev->dev, &olpc_bat); | |
579 | if (ret) | |
580 | goto battery_failed; | |
581 | ||
d7eb9e36 AS |
582 | ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom); |
583 | if (ret) | |
584 | goto eeprom_failed; | |
585 | ||
144bbeae AS |
586 | ret = device_create_file(olpc_bat.dev, &olpc_bat_error); |
587 | if (ret) | |
588 | goto error_failed; | |
589 | ||
fb972873 DW |
590 | goto success; |
591 | ||
144bbeae AS |
592 | error_failed: |
593 | device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom); | |
d7eb9e36 AS |
594 | eeprom_failed: |
595 | power_supply_unregister(&olpc_bat); | |
fb972873 DW |
596 | battery_failed: |
597 | power_supply_unregister(&olpc_ac); | |
598 | ac_failed: | |
599 | platform_device_unregister(bat_pdev); | |
600 | success: | |
601 | return ret; | |
602 | } | |
603 | ||
604 | static void __exit olpc_bat_exit(void) | |
605 | { | |
144bbeae | 606 | device_remove_file(olpc_bat.dev, &olpc_bat_error); |
d7eb9e36 | 607 | device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom); |
fb972873 DW |
608 | power_supply_unregister(&olpc_bat); |
609 | power_supply_unregister(&olpc_ac); | |
610 | platform_device_unregister(bat_pdev); | |
fb972873 DW |
611 | } |
612 | ||
613 | module_init(olpc_bat_init); | |
614 | module_exit(olpc_bat_exit); | |
615 | ||
616 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
617 | MODULE_LICENSE("GPL"); | |
618 | MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine"); |