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David Woodhousefb972872007-05-04 00:51:18 +04001/*
2 * Battery driver for One Laptop Per Child board.
3 *
David Woodhouse690e85a2010-08-09 18:13:09 +01004 * Copyright © 2006-2010 David Woodhouse <dwmw2@infradead.org>
David Woodhousefb972872007-05-04 00:51:18 +04005 *
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
Andres Salomon04a820e2009-06-30 02:14:00 -040011#include <linux/kernel.h>
David Woodhousefb972872007-05-04 00:51:18 +040012#include <linux/module.h>
Andres Salomon144bbea2009-06-30 02:15:26 -040013#include <linux/types.h>
David Woodhousefb972872007-05-04 00:51:18 +040014#include <linux/err.h>
Andres Salomon144bbea2009-06-30 02:15:26 -040015#include <linux/device.h>
David Woodhousefb972872007-05-04 00:51:18 +040016#include <linux/platform_device.h>
17#include <linux/power_supply.h>
18#include <linux/jiffies.h>
19#include <linux/sched.h>
Andres Salomon3bf94282012-07-11 01:16:29 -070020#include <linux/olpc-ec.h>
David Woodhousefb972872007-05-04 00:51:18 +040021#include <asm/olpc.h>
22
23
24#define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */
25#define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */
Andres Salomon75d88072008-05-14 16:20:38 -070026#define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */
David Woodhousefb972872007-05-04 00:51:18 +040027#define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */
28#define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */
29#define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */
30#define EC_BAT_SOC 0x16 /* uint8_t, percentage */
31#define EC_BAT_SERIAL 0x17 /* uint8_t[6] */
32#define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */
33#define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */
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
Andres Salomon8f7e5792009-06-30 02:16:17 -040042#define BAT_STAT_TRICKLE 0x80
David Woodhousefb972872007-05-04 00:51:18 +040043
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 * Power
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
David Woodhouse1ca5b9d2008-05-04 01:31:42 -040092static char bat_serial[17]; /* Ick */
93
Andres Salomonb2bd8a32008-05-02 13:41:59 -070094static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte)
95{
96 if (olpc_platform_info.ecver > 0x44) {
Andres Salomon8f7e5792009-06-30 02:16:17 -040097 if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
Andres Salomonb2bd8a32008-05-02 13:41:59 -070098 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 /* er,... */
104 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
105 } else {
106 /* Older EC didn't report charge/discharge bits */
107 if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */
108 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
109 else if (ec_byte & BAT_STAT_FULL)
110 val->intval = POWER_SUPPLY_STATUS_FULL;
111 else /* Not _necessarily_ true but EC doesn't tell all yet */
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 /* Eep. We don't know this failure code */
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
Sascha Silbeb202a5e2010-12-10 23:05:19 +0100205static 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: /* Gold Peak */
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) {
Richard A. Smithecc2edd2012-07-15 22:43:51 +0100235 case 1: /* Gold Peak, fall through */
Sascha Silbeb202a5e2010-12-10 23:05:19 +0100236 case 2: /* BYD */
Richard A. Smithecc2edd2012-07-15 22:43:51 +0100237 val->intval = 2800000;
Sascha Silbeb202a5e2010-12-10 23:05:19 +0100238 break;
239 default:
240 return -EIO;
241 }
242 break;
243
244 default:
245 return -EIO;
246 }
247
248 return ret;
249}
250
Sascha Silbe20fd9832010-12-10 23:05:20 +0100251static 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
Richard A. Smith5619d0b2012-07-15 22:43:25 +0100269static 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: /* Gold Peak */
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: /* Gold Peak */
301 val->intval = 6400000;
302 break;
303 case 2: /* BYD */
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
David Woodhousefb972872007-05-04 00:51:18 +0400318/*********************************************************************
319 * Battery properties
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;
Harvey Harrison8e9c7712008-10-15 22:01:23 -0700326 __be16 ec_word;
David Woodhousefb972872007-05-04 00:51:18 +0400327 uint8_t ec_byte;
Harvey Harrison8e9c7712008-10-15 22:01:23 -0700328 __be64 ser_buf;
David Woodhousefb972872007-05-04 00:51:18 +0400329
330 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
331 if (ret)
332 return ret;
333
334 /* Theoretically there's a race here -- the battery could be
335 removed immediately after we check whether it's present, and
336 then we query for some other property of the now-absent battery.
337 It doesn't matter though -- the EC will return the last-known
338 information, and it's as if we just ran that _little_ bit faster
339 and managed to read it out before the battery went away. */
Andres Salomon8f7e5792009-06-30 02:16:17 -0400340 if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) &&
341 psp != POWER_SUPPLY_PROP_PRESENT)
David Woodhousefb972872007-05-04 00:51:18 +0400342 return -ENODEV;
343
344 switch (psp) {
345 case POWER_SUPPLY_PROP_STATUS:
Andres Salomonb2bd8a32008-05-02 13:41:59 -0700346 ret = olpc_bat_get_status(val, ec_byte);
347 if (ret)
348 return ret;
349 break;
Andres Salomonee8076e2009-07-02 09:45:18 -0400350 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;
David Woodhousefb972872007-05-04 00:51:18 +0400358 case POWER_SUPPLY_PROP_PRESENT:
Andres Salomon8f7e5792009-06-30 02:16:17 -0400359 val->intval = !!(ec_byte & (BAT_STAT_PRESENT |
360 BAT_STAT_TRICKLE));
David Woodhousefb972872007-05-04 00:51:18 +0400361 break;
362
363 case POWER_SUPPLY_PROP_HEALTH:
364 if (ec_byte & BAT_STAT_DESTROY)
365 val->intval = POWER_SUPPLY_HEALTH_DEAD;
366 else {
Andres Salomonb2bd8a32008-05-02 13:41:59 -0700367 ret = olpc_bat_get_health(val);
David Woodhousefb972872007-05-04 00:51:18 +0400368 if (ret)
369 return ret;
David Woodhousefb972872007-05-04 00:51:18 +0400370 }
371 break;
372
373 case POWER_SUPPLY_PROP_MANUFACTURER:
Andres Salomonb2bd8a32008-05-02 13:41:59 -0700374 ret = olpc_bat_get_mfr(val);
David Woodhousefb972872007-05-04 00:51:18 +0400375 if (ret)
376 return ret;
David Woodhousefb972872007-05-04 00:51:18 +0400377 break;
378 case POWER_SUPPLY_PROP_TECHNOLOGY:
Andres Salomonb2bd8a32008-05-02 13:41:59 -0700379 ret = olpc_bat_get_tech(val);
David Woodhousefb972872007-05-04 00:51:18 +0400380 if (ret)
381 return ret;
David Woodhousefb972872007-05-04 00:51:18 +0400382 break;
383 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
Sascha Silbe22fadd72010-12-10 23:05:21 +0100384 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
David Woodhousefb972872007-05-04 00:51:18 +0400385 ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
386 if (ret)
387 return ret;
388
Richard A. Smith7cfbb292010-09-25 19:19:26 +0100389 val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32;
David Woodhousefb972872007-05-04 00:51:18 +0400390 break;
391 case POWER_SUPPLY_PROP_CURRENT_AVG:
Sascha Silbe22fadd72010-12-10 23:05:21 +0100392 case POWER_SUPPLY_PROP_CURRENT_NOW:
David Woodhousefb972872007-05-04 00:51:18 +0400393 ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
394 if (ret)
395 return ret;
396
Richard A. Smith7cfbb292010-09-25 19:19:26 +0100397 val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120;
David Woodhousefb972872007-05-04 00:51:18 +0400398 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;
Andres Salomonb294a292009-06-30 02:13:01 -0400405 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;
Sascha Silbeb202a5e2010-12-10 23:05:19 +0100413 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
414 ret = olpc_bat_get_charge_full_design(val);
415 if (ret)
416 return ret;
417 break;
Sascha Silbe20fd9832010-12-10 23:05:20 +0100418 case POWER_SUPPLY_PROP_CHARGE_NOW:
419 ret = olpc_bat_get_charge_now(val);
420 if (ret)
421 return ret;
422 break;
David Woodhousefb972872007-05-04 00:51:18 +0400423 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;
Harvey Harrison8e9c7712008-10-15 22:01:23 -0700427
Richard A. Smith7cfbb292010-09-25 19:19:26 +0100428 val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256;
David Woodhousefb972872007-05-04 00:51:18 +0400429 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
Harvey Harrison8e9c7712008-10-15 22:01:23 -0700435 val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
David Woodhousefb972872007-05-04 00:51:18 +0400436 break;
Andres Salomon8e552c32008-05-12 21:46:29 -0400437 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
Richard A. Smith7cfbb292010-09-25 19:19:26 +0100442 val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15;
Andres Salomon8e552c32008-05-12 21:46:29 -0400443 break;
David Woodhouse1ca5b9d2008-05-04 01:31:42 -0400444 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;
Richard A. Smith5619d0b2012-07-15 22:43:25 +0100452 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
453 ret = olpc_bat_get_voltage_max_design(val);
454 if (ret)
455 return ret;
456 break;
David Woodhousefb972872007-05-04 00:51:18 +0400457 default:
458 ret = -EINVAL;
459 break;
460 }
461
462 return ret;
463}
464
Daniel Drakec566d292010-12-29 19:12:01 +0000465static enum power_supply_property olpc_xo1_bat_props[] = {
David Woodhousefb972872007-05-04 00:51:18 +0400466 POWER_SUPPLY_PROP_STATUS,
Andres Salomonee8076e2009-07-02 09:45:18 -0400467 POWER_SUPPLY_PROP_CHARGE_TYPE,
David Woodhousefb972872007-05-04 00:51:18 +0400468 POWER_SUPPLY_PROP_PRESENT,
469 POWER_SUPPLY_PROP_HEALTH,
470 POWER_SUPPLY_PROP_TECHNOLOGY,
471 POWER_SUPPLY_PROP_VOLTAGE_AVG,
Sascha Silbe22fadd72010-12-10 23:05:21 +0100472 POWER_SUPPLY_PROP_VOLTAGE_NOW,
David Woodhousefb972872007-05-04 00:51:18 +0400473 POWER_SUPPLY_PROP_CURRENT_AVG,
Sascha Silbe22fadd72010-12-10 23:05:21 +0100474 POWER_SUPPLY_PROP_CURRENT_NOW,
David Woodhousefb972872007-05-04 00:51:18 +0400475 POWER_SUPPLY_PROP_CAPACITY,
Andres Salomonb294a292009-06-30 02:13:01 -0400476 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
Sascha Silbeb202a5e2010-12-10 23:05:19 +0100477 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
Sascha Silbe20fd9832010-12-10 23:05:20 +0100478 POWER_SUPPLY_PROP_CHARGE_NOW,
David Woodhousefb972872007-05-04 00:51:18 +0400479 POWER_SUPPLY_PROP_TEMP,
480 POWER_SUPPLY_PROP_TEMP_AMBIENT,
481 POWER_SUPPLY_PROP_MANUFACTURER,
David Woodhouse1ca5b9d2008-05-04 01:31:42 -0400482 POWER_SUPPLY_PROP_SERIAL_NUMBER,
Andres Salomon8e552c32008-05-12 21:46:29 -0400483 POWER_SUPPLY_PROP_CHARGE_COUNTER,
Richard A. Smith5619d0b2012-07-15 22:43:25 +0100484 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
David Woodhousefb972872007-05-04 00:51:18 +0400485};
486
Daniel Drakec566d292010-12-29 19:12:01 +0000487/* XO-1.5 does not have ambient temperature property */
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,
Sascha Silbebf542a42011-01-12 23:23:23 +0100495 POWER_SUPPLY_PROP_VOLTAGE_NOW,
Daniel Drakec566d292010-12-29 19:12:01 +0000496 POWER_SUPPLY_PROP_CURRENT_AVG,
Sascha Silbebf542a42011-01-12 23:23:23 +0100497 POWER_SUPPLY_PROP_CURRENT_NOW,
Daniel Drakec566d292010-12-29 19:12:01 +0000498 POWER_SUPPLY_PROP_CAPACITY,
499 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
Sascha Silbebf542a42011-01-12 23:23:23 +0100500 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
501 POWER_SUPPLY_PROP_CHARGE_NOW,
Daniel Drakec566d292010-12-29 19:12:01 +0000502 POWER_SUPPLY_PROP_TEMP,
503 POWER_SUPPLY_PROP_MANUFACTURER,
504 POWER_SUPPLY_PROP_SERIAL_NUMBER,
505 POWER_SUPPLY_PROP_CHARGE_COUNTER,
Richard A. Smith5619d0b2012-07-15 22:43:25 +0100506 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
Daniel Drakec566d292010-12-29 19:12:01 +0000507};
508
Andres Salomond7eb9e32008-05-02 13:41:58 -0700509/* EEPROM reading goes completely around the power_supply API, sadly */
510
511#define EEPROM_START 0x20
512#define EEPROM_END 0x80
513#define EEPROM_SIZE (EEPROM_END - EEPROM_START)
514
Chris Wright2c3c8be2010-05-12 18:28:57 -0700515static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj,
Andres Salomond7eb9e32008-05-02 13:41:58 -0700516 struct bin_attribute *attr, char *buf, loff_t off, size_t count)
517{
518 uint8_t ec_byte;
Andres Salomon04a820e2009-06-30 02:14:00 -0400519 int ret;
520 int i;
Andres Salomond7eb9e32008-05-02 13:41:58 -0700521
522 if (off >= EEPROM_SIZE)
523 return 0;
524 if (off + count > EEPROM_SIZE)
525 count = EEPROM_SIZE - off;
526
Andres Salomon04a820e2009-06-30 02:14:00 -0400527 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);
Andres Salomond7eb9e32008-05-02 13:41:58 -0700530 if (ret) {
Andres Salomon04a820e2009-06-30 02:14:00 -0400531 pr_err("olpc-battery: "
532 "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n",
533 ec_byte, ret);
Andres Salomond7eb9e32008-05-02 13:41:58 -0700534 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,
Andres Salomond7eb9e32008-05-02 13:41:58 -0700545 },
546 .size = 0,
547 .read = olpc_bat_eeprom_read,
548};
549
Andres Salomon144bbea2009-06-30 02:15:26 -0400550/* Allow userspace to see the specific error value pulled from the EC */
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
David Woodhousefb972872007-05-04 00:51:18 +0400573/*********************************************************************
574 * Initialisation
575 *********************************************************************/
576
David Woodhousefb972872007-05-04 00:51:18 +0400577static struct power_supply olpc_bat = {
Daniel Drakec3503fd2011-08-10 21:45:36 +0100578 .name = "olpc-battery",
David Woodhousefb972872007-05-04 00:51:18 +0400579 .get_property = olpc_bat_get_property,
580 .use_for_apm = 1,
581};
582
Daniel Drakecae659a2011-08-10 21:46:02 +0100583static 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
Daniel Drakec3503fd2011-08-10 21:45:36 +0100601static int __devinit olpc_battery_probe(struct platform_device *pdev)
David Woodhousefb972872007-05-04 00:51:18 +0400602{
Daniel Drakec3503fd2011-08-10 21:45:36 +0100603 int ret;
David Woodhousefb972872007-05-04 00:51:18 +0400604 uint8_t status;
605
Andres Salomon484d6d52008-05-02 13:41:59 -0700606 /*
607 * We've seen a number of EC protocol changes; this driver requires
608 * the latest EC protocol, supported by 0x44 and above.
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);
David Woodhousefb972872007-05-04 00:51:18 +0400613 return -ENXIO;
614 }
615
616 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
617 if (ret)
618 return ret;
619
620 /* Ignore the status. It doesn't actually matter */
621
Daniel Drakec3503fd2011-08-10 21:45:36 +0100622 ret = power_supply_register(&pdev->dev, &olpc_ac);
David Woodhousefb972872007-05-04 00:51:18 +0400623 if (ret)
Daniel Drakec3503fd2011-08-10 21:45:36 +0100624 return ret;
David Woodhousefb972872007-05-04 00:51:18 +0400625
Daniel Drakec566d292010-12-29 19:12:01 +0000626 if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */
627 olpc_bat.properties = olpc_xo15_bat_props;
628 olpc_bat.num_properties = ARRAY_SIZE(olpc_xo15_bat_props);
629 } else { /* XO-1 */
630 olpc_bat.properties = olpc_xo1_bat_props;
631 olpc_bat.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
632 }
David Woodhousefb972872007-05-04 00:51:18 +0400633
Daniel Drakec3503fd2011-08-10 21:45:36 +0100634 ret = power_supply_register(&pdev->dev, &olpc_bat);
David Woodhousefb972872007-05-04 00:51:18 +0400635 if (ret)
636 goto battery_failed;
637
Andres Salomond7eb9e32008-05-02 13:41:58 -0700638 ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
639 if (ret)
640 goto eeprom_failed;
641
Andres Salomon144bbea2009-06-30 02:15:26 -0400642 ret = device_create_file(olpc_bat.dev, &olpc_bat_error);
643 if (ret)
644 goto error_failed;
645
Daniel Drakecae659a2011-08-10 21:46:02 +0100646 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
Daniel Drakec3503fd2011-08-10 21:45:36 +0100651 return 0;
David Woodhousefb972872007-05-04 00:51:18 +0400652
Andres Salomon144bbea2009-06-30 02:15:26 -0400653error_failed:
654 device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
Andres Salomond7eb9e32008-05-02 13:41:58 -0700655eeprom_failed:
656 power_supply_unregister(&olpc_bat);
David Woodhousefb972872007-05-04 00:51:18 +0400657battery_failed:
658 power_supply_unregister(&olpc_ac);
David Woodhousefb972872007-05-04 00:51:18 +0400659 return ret;
660}
661
Daniel Drakec3503fd2011-08-10 21:45:36 +0100662static int __devexit olpc_battery_remove(struct platform_device *pdev)
David Woodhousefb972872007-05-04 00:51:18 +0400663{
Andres Salomon144bbea2009-06-30 02:15:26 -0400664 device_remove_file(olpc_bat.dev, &olpc_bat_error);
Andres Salomond7eb9e32008-05-02 13:41:58 -0700665 device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
David Woodhousefb972872007-05-04 00:51:18 +0400666 power_supply_unregister(&olpc_bat);
667 power_supply_unregister(&olpc_ac);
Daniel Drakec3503fd2011-08-10 21:45:36 +0100668 return 0;
David Woodhousefb972872007-05-04 00:51:18 +0400669}
670
Daniel Drakec3503fd2011-08-10 21:45:36 +0100671static const struct of_device_id olpc_battery_ids[] __devinitconst = {
672 { .compatible = "olpc,xo1-battery" },
673 {}
674};
675MODULE_DEVICE_TABLE(of, olpc_battery_ids);
676
Anton Vorontsov5519d002011-11-24 22:49:07 +0400677static struct platform_driver olpc_battery_driver = {
Daniel Drakec3503fd2011-08-10 21:45:36 +0100678 .driver = {
679 .name = "olpc-battery",
680 .owner = THIS_MODULE,
681 .of_match_table = olpc_battery_ids,
682 },
683 .probe = olpc_battery_probe,
684 .remove = __devexit_p(olpc_battery_remove),
Daniel Drakecae659a2011-08-10 21:46:02 +0100685 .suspend = olpc_battery_suspend,
Daniel Drakec3503fd2011-08-10 21:45:36 +0100686};
687
Axel Lin300bac72011-11-26 12:01:10 +0800688module_platform_driver(olpc_battery_driver);
David Woodhousefb972872007-05-04 00:51:18 +0400689
690MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
691MODULE_LICENSE("GPL");
692MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");