Root/
1 | /* |
2 | * Battery driver for One Laptop Per Child board. |
3 | * |
4 | * Copyright © 2006 David Woodhouse <dwmw2@infradead.org> |
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 | |
11 | #include <linux/kernel.h> |
12 | #include <linux/module.h> |
13 | #include <linux/types.h> |
14 | #include <linux/err.h> |
15 | #include <linux/device.h> |
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 */ |
25 | #define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */ |
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 |
41 | #define BAT_STAT_TRICKLE 0x80 |
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 | |
91 | static char bat_serial[17]; /* Ick */ |
92 | |
93 | static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte) |
94 | { |
95 | if (olpc_platform_info.ecver > 0x44) { |
96 | if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE)) |
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 | |
204 | /********************************************************************* |
205 | * Battery properties |
206 | *********************************************************************/ |
207 | static int olpc_bat_get_property(struct power_supply *psy, |
208 | enum power_supply_property psp, |
209 | union power_supply_propval *val) |
210 | { |
211 | int ret = 0; |
212 | __be16 ec_word; |
213 | uint8_t ec_byte; |
214 | __be64 ser_buf; |
215 | |
216 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1); |
217 | if (ret) |
218 | return ret; |
219 | |
220 | /* Theoretically there's a race here -- the battery could be |
221 | removed immediately after we check whether it's present, and |
222 | then we query for some other property of the now-absent battery. |
223 | It doesn't matter though -- the EC will return the last-known |
224 | information, and it's as if we just ran that _little_ bit faster |
225 | and managed to read it out before the battery went away. */ |
226 | if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) && |
227 | psp != POWER_SUPPLY_PROP_PRESENT) |
228 | return -ENODEV; |
229 | |
230 | switch (psp) { |
231 | case POWER_SUPPLY_PROP_STATUS: |
232 | ret = olpc_bat_get_status(val, ec_byte); |
233 | if (ret) |
234 | return ret; |
235 | break; |
236 | case POWER_SUPPLY_PROP_CHARGE_TYPE: |
237 | if (ec_byte & BAT_STAT_TRICKLE) |
238 | val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; |
239 | else if (ec_byte & BAT_STAT_CHARGING) |
240 | val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; |
241 | else |
242 | val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; |
243 | break; |
244 | case POWER_SUPPLY_PROP_PRESENT: |
245 | val->intval = !!(ec_byte & (BAT_STAT_PRESENT | |
246 | BAT_STAT_TRICKLE)); |
247 | break; |
248 | |
249 | case POWER_SUPPLY_PROP_HEALTH: |
250 | if (ec_byte & BAT_STAT_DESTROY) |
251 | val->intval = POWER_SUPPLY_HEALTH_DEAD; |
252 | else { |
253 | ret = olpc_bat_get_health(val); |
254 | if (ret) |
255 | return ret; |
256 | } |
257 | break; |
258 | |
259 | case POWER_SUPPLY_PROP_MANUFACTURER: |
260 | ret = olpc_bat_get_mfr(val); |
261 | if (ret) |
262 | return ret; |
263 | break; |
264 | case POWER_SUPPLY_PROP_TECHNOLOGY: |
265 | ret = olpc_bat_get_tech(val); |
266 | if (ret) |
267 | return ret; |
268 | break; |
269 | case POWER_SUPPLY_PROP_VOLTAGE_AVG: |
270 | ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2); |
271 | if (ret) |
272 | return ret; |
273 | |
274 | val->intval = (int)be16_to_cpu(ec_word) * 9760L / 32; |
275 | break; |
276 | case POWER_SUPPLY_PROP_CURRENT_AVG: |
277 | ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2); |
278 | if (ret) |
279 | return ret; |
280 | |
281 | val->intval = (int)be16_to_cpu(ec_word) * 15625L / 120; |
282 | break; |
283 | case POWER_SUPPLY_PROP_CAPACITY: |
284 | ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1); |
285 | if (ret) |
286 | return ret; |
287 | val->intval = ec_byte; |
288 | break; |
289 | case POWER_SUPPLY_PROP_CAPACITY_LEVEL: |
290 | if (ec_byte & BAT_STAT_FULL) |
291 | val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; |
292 | else if (ec_byte & BAT_STAT_LOW) |
293 | val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; |
294 | else |
295 | val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; |
296 | break; |
297 | case POWER_SUPPLY_PROP_TEMP: |
298 | ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2); |
299 | if (ret) |
300 | return ret; |
301 | |
302 | val->intval = (int)be16_to_cpu(ec_word) * 100 / 256; |
303 | break; |
304 | case POWER_SUPPLY_PROP_TEMP_AMBIENT: |
305 | ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2); |
306 | if (ret) |
307 | return ret; |
308 | |
309 | val->intval = (int)be16_to_cpu(ec_word) * 100 / 256; |
310 | break; |
311 | case POWER_SUPPLY_PROP_CHARGE_COUNTER: |
312 | ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2); |
313 | if (ret) |
314 | return ret; |
315 | |
316 | val->intval = (int)be16_to_cpu(ec_word) * 6250 / 15; |
317 | break; |
318 | case POWER_SUPPLY_PROP_SERIAL_NUMBER: |
319 | ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8); |
320 | if (ret) |
321 | return ret; |
322 | |
323 | sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf)); |
324 | val->strval = bat_serial; |
325 | break; |
326 | default: |
327 | ret = -EINVAL; |
328 | break; |
329 | } |
330 | |
331 | return ret; |
332 | } |
333 | |
334 | static enum power_supply_property olpc_bat_props[] = { |
335 | POWER_SUPPLY_PROP_STATUS, |
336 | POWER_SUPPLY_PROP_CHARGE_TYPE, |
337 | POWER_SUPPLY_PROP_PRESENT, |
338 | POWER_SUPPLY_PROP_HEALTH, |
339 | POWER_SUPPLY_PROP_TECHNOLOGY, |
340 | POWER_SUPPLY_PROP_VOLTAGE_AVG, |
341 | POWER_SUPPLY_PROP_CURRENT_AVG, |
342 | POWER_SUPPLY_PROP_CAPACITY, |
343 | POWER_SUPPLY_PROP_CAPACITY_LEVEL, |
344 | POWER_SUPPLY_PROP_TEMP, |
345 | POWER_SUPPLY_PROP_TEMP_AMBIENT, |
346 | POWER_SUPPLY_PROP_MANUFACTURER, |
347 | POWER_SUPPLY_PROP_SERIAL_NUMBER, |
348 | POWER_SUPPLY_PROP_CHARGE_COUNTER, |
349 | }; |
350 | |
351 | /* EEPROM reading goes completely around the power_supply API, sadly */ |
352 | |
353 | #define EEPROM_START 0x20 |
354 | #define EEPROM_END 0x80 |
355 | #define EEPROM_SIZE (EEPROM_END - EEPROM_START) |
356 | |
357 | static ssize_t olpc_bat_eeprom_read(struct kobject *kobj, |
358 | struct bin_attribute *attr, char *buf, loff_t off, size_t count) |
359 | { |
360 | uint8_t ec_byte; |
361 | int ret; |
362 | int i; |
363 | |
364 | if (off >= EEPROM_SIZE) |
365 | return 0; |
366 | if (off + count > EEPROM_SIZE) |
367 | count = EEPROM_SIZE - off; |
368 | |
369 | for (i = 0; i < count; i++) { |
370 | ec_byte = EEPROM_START + off + i; |
371 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1); |
372 | if (ret) { |
373 | pr_err("olpc-battery: " |
374 | "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n", |
375 | ec_byte, ret); |
376 | return -EIO; |
377 | } |
378 | } |
379 | |
380 | return count; |
381 | } |
382 | |
383 | static struct bin_attribute olpc_bat_eeprom = { |
384 | .attr = { |
385 | .name = "eeprom", |
386 | .mode = S_IRUGO, |
387 | .owner = THIS_MODULE, |
388 | }, |
389 | .size = 0, |
390 | .read = olpc_bat_eeprom_read, |
391 | }; |
392 | |
393 | /* Allow userspace to see the specific error value pulled from the EC */ |
394 | |
395 | static ssize_t olpc_bat_error_read(struct device *dev, |
396 | struct device_attribute *attr, char *buf) |
397 | { |
398 | uint8_t ec_byte; |
399 | ssize_t ret; |
400 | |
401 | ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); |
402 | if (ret < 0) |
403 | return ret; |
404 | |
405 | return sprintf(buf, "%d\n", ec_byte); |
406 | } |
407 | |
408 | static struct device_attribute olpc_bat_error = { |
409 | .attr = { |
410 | .name = "error", |
411 | .mode = S_IRUGO, |
412 | }, |
413 | .show = olpc_bat_error_read, |
414 | }; |
415 | |
416 | /********************************************************************* |
417 | * Initialisation |
418 | *********************************************************************/ |
419 | |
420 | static struct platform_device *bat_pdev; |
421 | |
422 | static struct power_supply olpc_bat = { |
423 | .properties = olpc_bat_props, |
424 | .num_properties = ARRAY_SIZE(olpc_bat_props), |
425 | .get_property = olpc_bat_get_property, |
426 | .use_for_apm = 1, |
427 | }; |
428 | |
429 | void olpc_battery_trigger_uevent(unsigned long cause) |
430 | { |
431 | if (cause & EC_SCI_SRC_ACPWR) |
432 | kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE); |
433 | if (cause & (EC_SCI_SRC_BATERR|EC_SCI_SRC_BATSOC|EC_SCI_SRC_BATTERY)) |
434 | kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE); |
435 | } |
436 | |
437 | static int __init olpc_bat_init(void) |
438 | { |
439 | int ret = 0; |
440 | uint8_t status; |
441 | |
442 | if (!olpc_platform_info.ecver) |
443 | return -ENXIO; |
444 | |
445 | /* |
446 | * We've seen a number of EC protocol changes; this driver requires |
447 | * the latest EC protocol, supported by 0x44 and above. |
448 | */ |
449 | if (olpc_platform_info.ecver < 0x44) { |
450 | printk(KERN_NOTICE "OLPC EC version 0x%02x too old for " |
451 | "battery driver.\n", olpc_platform_info.ecver); |
452 | return -ENXIO; |
453 | } |
454 | |
455 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); |
456 | if (ret) |
457 | return ret; |
458 | |
459 | /* Ignore the status. It doesn't actually matter */ |
460 | |
461 | bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0); |
462 | if (IS_ERR(bat_pdev)) |
463 | return PTR_ERR(bat_pdev); |
464 | |
465 | ret = power_supply_register(&bat_pdev->dev, &olpc_ac); |
466 | if (ret) |
467 | goto ac_failed; |
468 | |
469 | olpc_bat.name = bat_pdev->name; |
470 | |
471 | ret = power_supply_register(&bat_pdev->dev, &olpc_bat); |
472 | if (ret) |
473 | goto battery_failed; |
474 | |
475 | ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom); |
476 | if (ret) |
477 | goto eeprom_failed; |
478 | |
479 | ret = device_create_file(olpc_bat.dev, &olpc_bat_error); |
480 | if (ret) |
481 | goto error_failed; |
482 | |
483 | goto success; |
484 | |
485 | error_failed: |
486 | device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom); |
487 | eeprom_failed: |
488 | power_supply_unregister(&olpc_bat); |
489 | battery_failed: |
490 | power_supply_unregister(&olpc_ac); |
491 | ac_failed: |
492 | platform_device_unregister(bat_pdev); |
493 | success: |
494 | return ret; |
495 | } |
496 | |
497 | static void __exit olpc_bat_exit(void) |
498 | { |
499 | device_remove_file(olpc_bat.dev, &olpc_bat_error); |
500 | device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom); |
501 | power_supply_unregister(&olpc_bat); |
502 | power_supply_unregister(&olpc_ac); |
503 | platform_device_unregister(bat_pdev); |
504 | } |
505 | |
506 | module_init(olpc_bat_init); |
507 | module_exit(olpc_bat_exit); |
508 | |
509 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); |
510 | MODULE_LICENSE("GPL"); |
511 | MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine"); |
512 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9