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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>
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 */
Andres Salomon75d88072008-05-14 16:20:38 -070025#define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */
David Woodhousefb972872007-05-04 00:51:18 +040026#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
Andres Salomon8f7e5792009-06-30 02:16:17 -040041#define BAT_STAT_TRICKLE 0x80
David Woodhousefb972872007-05-04 00:51:18 +040042
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
57static 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
79static enum power_supply_property olpc_ac_props[] = {
80 POWER_SUPPLY_PROP_ONLINE,
81};
82
83static 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
David Woodhouse1ca5b9d2008-05-04 01:31:42 -040091static char bat_serial[17]; /* Ick */
92
Andres Salomonb2bd8a32008-05-02 13:41:59 -070093static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte)
94{
95 if (olpc_platform_info.ecver > 0x44) {
Andres Salomon8f7e5792009-06-30 02:16:17 -040096 if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
Andres Salomonb2bd8a32008-05-02 13:41:59 -070097 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
117static 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
154static 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
179static 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
Sascha Silbeb202a5e2010-12-10 23:05:19 +0100204static 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
Sascha Silbe20fd9832010-12-10 23:05:20 +0100252static 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
David Woodhousefb972872007-05-04 00:51:18 +0400270/*********************************************************************
271 * Battery properties
272 *********************************************************************/
273static 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;
Harvey Harrison8e9c7712008-10-15 22:01:23 -0700278 __be16 ec_word;
David Woodhousefb972872007-05-04 00:51:18 +0400279 uint8_t ec_byte;
Harvey Harrison8e9c7712008-10-15 22:01:23 -0700280 __be64 ser_buf;
David Woodhousefb972872007-05-04 00:51:18 +0400281
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. */
Andres Salomon8f7e5792009-06-30 02:16:17 -0400292 if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) &&
293 psp != POWER_SUPPLY_PROP_PRESENT)
David Woodhousefb972872007-05-04 00:51:18 +0400294 return -ENODEV;
295
296 switch (psp) {
297 case POWER_SUPPLY_PROP_STATUS:
Andres Salomonb2bd8a32008-05-02 13:41:59 -0700298 ret = olpc_bat_get_status(val, ec_byte);
299 if (ret)
300 return ret;
301 break;
Andres Salomonee8076e2009-07-02 09:45:18 -0400302 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;
David Woodhousefb972872007-05-04 00:51:18 +0400310 case POWER_SUPPLY_PROP_PRESENT:
Andres Salomon8f7e5792009-06-30 02:16:17 -0400311 val->intval = !!(ec_byte & (BAT_STAT_PRESENT |
312 BAT_STAT_TRICKLE));
David Woodhousefb972872007-05-04 00:51:18 +0400313 break;
314
315 case POWER_SUPPLY_PROP_HEALTH:
316 if (ec_byte & BAT_STAT_DESTROY)
317 val->intval = POWER_SUPPLY_HEALTH_DEAD;
318 else {
Andres Salomonb2bd8a32008-05-02 13:41:59 -0700319 ret = olpc_bat_get_health(val);
David Woodhousefb972872007-05-04 00:51:18 +0400320 if (ret)
321 return ret;
David Woodhousefb972872007-05-04 00:51:18 +0400322 }
323 break;
324
325 case POWER_SUPPLY_PROP_MANUFACTURER:
Andres Salomonb2bd8a32008-05-02 13:41:59 -0700326 ret = olpc_bat_get_mfr(val);
David Woodhousefb972872007-05-04 00:51:18 +0400327 if (ret)
328 return ret;
David Woodhousefb972872007-05-04 00:51:18 +0400329 break;
330 case POWER_SUPPLY_PROP_TECHNOLOGY:
Andres Salomonb2bd8a32008-05-02 13:41:59 -0700331 ret = olpc_bat_get_tech(val);
David Woodhousefb972872007-05-04 00:51:18 +0400332 if (ret)
333 return ret;
David Woodhousefb972872007-05-04 00:51:18 +0400334 break;
335 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
Sascha Silbe22fadd72010-12-10 23:05:21 +0100336 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
David Woodhousefb972872007-05-04 00:51:18 +0400337 ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
338 if (ret)
339 return ret;
340
Richard A. Smith7cfbb292010-09-25 19:19:26 +0100341 val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32;
David Woodhousefb972872007-05-04 00:51:18 +0400342 break;
343 case POWER_SUPPLY_PROP_CURRENT_AVG:
Sascha Silbe22fadd72010-12-10 23:05:21 +0100344 case POWER_SUPPLY_PROP_CURRENT_NOW:
David Woodhousefb972872007-05-04 00:51:18 +0400345 ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
346 if (ret)
347 return ret;
348
Richard A. Smith7cfbb292010-09-25 19:19:26 +0100349 val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120;
David Woodhousefb972872007-05-04 00:51:18 +0400350 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;
Andres Salomonb294a292009-06-30 02:13:01 -0400357 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;
Sascha Silbeb202a5e2010-12-10 23:05:19 +0100365 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
366 ret = olpc_bat_get_charge_full_design(val);
367 if (ret)
368 return ret;
369 break;
Sascha Silbe20fd9832010-12-10 23:05:20 +0100370 case POWER_SUPPLY_PROP_CHARGE_NOW:
371 ret = olpc_bat_get_charge_now(val);
372 if (ret)
373 return ret;
374 break;
David Woodhousefb972872007-05-04 00:51:18 +0400375 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;
Harvey Harrison8e9c7712008-10-15 22:01:23 -0700379
Richard A. Smith7cfbb292010-09-25 19:19:26 +0100380 val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256;
David Woodhousefb972872007-05-04 00:51:18 +0400381 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
Harvey Harrison8e9c7712008-10-15 22:01:23 -0700387 val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
David Woodhousefb972872007-05-04 00:51:18 +0400388 break;
Andres Salomon8e552c32008-05-12 21:46:29 -0400389 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
Richard A. Smith7cfbb292010-09-25 19:19:26 +0100394 val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15;
Andres Salomon8e552c32008-05-12 21:46:29 -0400395 break;
David Woodhouse1ca5b9d2008-05-04 01:31:42 -0400396 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;
David Woodhousefb972872007-05-04 00:51:18 +0400404 default:
405 ret = -EINVAL;
406 break;
407 }
408
409 return ret;
410}
411
Daniel Drakec566d292010-12-29 19:12:01 +0000412static enum power_supply_property olpc_xo1_bat_props[] = {
David Woodhousefb972872007-05-04 00:51:18 +0400413 POWER_SUPPLY_PROP_STATUS,
Andres Salomonee8076e2009-07-02 09:45:18 -0400414 POWER_SUPPLY_PROP_CHARGE_TYPE,
David Woodhousefb972872007-05-04 00:51:18 +0400415 POWER_SUPPLY_PROP_PRESENT,
416 POWER_SUPPLY_PROP_HEALTH,
417 POWER_SUPPLY_PROP_TECHNOLOGY,
418 POWER_SUPPLY_PROP_VOLTAGE_AVG,
Sascha Silbe22fadd72010-12-10 23:05:21 +0100419 POWER_SUPPLY_PROP_VOLTAGE_NOW,
David Woodhousefb972872007-05-04 00:51:18 +0400420 POWER_SUPPLY_PROP_CURRENT_AVG,
Sascha Silbe22fadd72010-12-10 23:05:21 +0100421 POWER_SUPPLY_PROP_CURRENT_NOW,
David Woodhousefb972872007-05-04 00:51:18 +0400422 POWER_SUPPLY_PROP_CAPACITY,
Andres Salomonb294a292009-06-30 02:13:01 -0400423 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
Sascha Silbeb202a5e2010-12-10 23:05:19 +0100424 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
Sascha Silbe20fd9832010-12-10 23:05:20 +0100425 POWER_SUPPLY_PROP_CHARGE_NOW,
David Woodhousefb972872007-05-04 00:51:18 +0400426 POWER_SUPPLY_PROP_TEMP,
427 POWER_SUPPLY_PROP_TEMP_AMBIENT,
428 POWER_SUPPLY_PROP_MANUFACTURER,
David Woodhouse1ca5b9d2008-05-04 01:31:42 -0400429 POWER_SUPPLY_PROP_SERIAL_NUMBER,
Andres Salomon8e552c32008-05-12 21:46:29 -0400430 POWER_SUPPLY_PROP_CHARGE_COUNTER,
David Woodhousefb972872007-05-04 00:51:18 +0400431};
432
Daniel Drakec566d292010-12-29 19:12:01 +0000433/* XO-1.5 does not have ambient temperature property */
434static 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,
Sascha Silbebf542a42011-01-12 23:23:23 +0100441 POWER_SUPPLY_PROP_VOLTAGE_NOW,
Daniel Drakec566d292010-12-29 19:12:01 +0000442 POWER_SUPPLY_PROP_CURRENT_AVG,
Sascha Silbebf542a42011-01-12 23:23:23 +0100443 POWER_SUPPLY_PROP_CURRENT_NOW,
Daniel Drakec566d292010-12-29 19:12:01 +0000444 POWER_SUPPLY_PROP_CAPACITY,
445 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
Sascha Silbebf542a42011-01-12 23:23:23 +0100446 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
447 POWER_SUPPLY_PROP_CHARGE_NOW,
Daniel Drakec566d292010-12-29 19:12:01 +0000448 POWER_SUPPLY_PROP_TEMP,
449 POWER_SUPPLY_PROP_MANUFACTURER,
450 POWER_SUPPLY_PROP_SERIAL_NUMBER,
451 POWER_SUPPLY_PROP_CHARGE_COUNTER,
452};
453
Andres Salomond7eb9e32008-05-02 13:41:58 -0700454/* 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
Chris Wright2c3c8be2010-05-12 18:28:57 -0700460static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj,
Andres Salomond7eb9e32008-05-02 13:41:58 -0700461 struct bin_attribute *attr, char *buf, loff_t off, size_t count)
462{
463 uint8_t ec_byte;
Andres Salomon04a820e2009-06-30 02:14:00 -0400464 int ret;
465 int i;
Andres Salomond7eb9e32008-05-02 13:41:58 -0700466
467 if (off >= EEPROM_SIZE)
468 return 0;
469 if (off + count > EEPROM_SIZE)
470 count = EEPROM_SIZE - off;
471
Andres Salomon04a820e2009-06-30 02:14:00 -0400472 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);
Andres Salomond7eb9e32008-05-02 13:41:58 -0700475 if (ret) {
Andres Salomon04a820e2009-06-30 02:14:00 -0400476 pr_err("olpc-battery: "
477 "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n",
478 ec_byte, ret);
Andres Salomond7eb9e32008-05-02 13:41:58 -0700479 return -EIO;
480 }
481 }
482
483 return count;
484}
485
486static struct bin_attribute olpc_bat_eeprom = {
487 .attr = {
488 .name = "eeprom",
489 .mode = S_IRUGO,
Andres Salomond7eb9e32008-05-02 13:41:58 -0700490 },
491 .size = 0,
492 .read = olpc_bat_eeprom_read,
493};
494
Andres Salomon144bbea2009-06-30 02:15:26 -0400495/* Allow userspace to see the specific error value pulled from the EC */
496
497static 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
510static struct device_attribute olpc_bat_error = {
511 .attr = {
512 .name = "error",
513 .mode = S_IRUGO,
514 },
515 .show = olpc_bat_error_read,
516};
517
David Woodhousefb972872007-05-04 00:51:18 +0400518/*********************************************************************
519 * Initialisation
520 *********************************************************************/
521
522static struct platform_device *bat_pdev;
523
524static struct power_supply olpc_bat = {
David Woodhousefb972872007-05-04 00:51:18 +0400525 .get_property = olpc_bat_get_property,
526 .use_for_apm = 1,
527};
528
529void 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
537static 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;
Andres Salomon484d6d52008-05-02 13:41:59 -0700544
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);
David Woodhousefb972872007-05-04 00:51:18 +0400552 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;
Daniel Drakec566d292010-12-29 19:12:01 +0000570 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 }
David Woodhousefb972872007-05-04 00:51:18 +0400577
578 ret = power_supply_register(&bat_pdev->dev, &olpc_bat);
579 if (ret)
580 goto battery_failed;
581
Andres Salomond7eb9e32008-05-02 13:41:58 -0700582 ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
583 if (ret)
584 goto eeprom_failed;
585
Andres Salomon144bbea2009-06-30 02:15:26 -0400586 ret = device_create_file(olpc_bat.dev, &olpc_bat_error);
587 if (ret)
588 goto error_failed;
589
David Woodhousefb972872007-05-04 00:51:18 +0400590 goto success;
591
Andres Salomon144bbea2009-06-30 02:15:26 -0400592error_failed:
593 device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
Andres Salomond7eb9e32008-05-02 13:41:58 -0700594eeprom_failed:
595 power_supply_unregister(&olpc_bat);
David Woodhousefb972872007-05-04 00:51:18 +0400596battery_failed:
597 power_supply_unregister(&olpc_ac);
598ac_failed:
599 platform_device_unregister(bat_pdev);
600success:
601 return ret;
602}
603
604static void __exit olpc_bat_exit(void)
605{
Andres Salomon144bbea2009-06-30 02:15:26 -0400606 device_remove_file(olpc_bat.dev, &olpc_bat_error);
Andres Salomond7eb9e32008-05-02 13:41:58 -0700607 device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
David Woodhousefb972872007-05-04 00:51:18 +0400608 power_supply_unregister(&olpc_bat);
609 power_supply_unregister(&olpc_ac);
610 platform_device_unregister(bat_pdev);
David Woodhousefb972872007-05-04 00:51:18 +0400611}
612
613module_init(olpc_bat_init);
614module_exit(olpc_bat_exit);
615
616MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
617MODULE_LICENSE("GPL");
618MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");