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fb972873 DW |
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/module.h> | |
12 | #include <linux/err.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/power_supply.h> | |
15 | #include <linux/jiffies.h> | |
16 | #include <linux/sched.h> | |
17 | #include <asm/olpc.h> | |
18 | ||
19 | ||
20 | #define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */ | |
21 | #define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */ | |
75d88079 | 22 | #define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */ |
fb972873 DW |
23 | #define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */ |
24 | #define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */ | |
25 | #define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */ | |
26 | #define EC_BAT_SOC 0x16 /* uint8_t, percentage */ | |
27 | #define EC_BAT_SERIAL 0x17 /* uint8_t[6] */ | |
28 | #define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */ | |
29 | #define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */ | |
30 | ||
31 | #define BAT_STAT_PRESENT 0x01 | |
32 | #define BAT_STAT_FULL 0x02 | |
33 | #define BAT_STAT_LOW 0x04 | |
34 | #define BAT_STAT_DESTROY 0x08 | |
35 | #define BAT_STAT_AC 0x10 | |
36 | #define BAT_STAT_CHARGING 0x20 | |
37 | #define BAT_STAT_DISCHARGING 0x40 | |
38 | ||
39 | #define BAT_ERR_INFOFAIL 0x02 | |
40 | #define BAT_ERR_OVERVOLTAGE 0x04 | |
41 | #define BAT_ERR_OVERTEMP 0x05 | |
42 | #define BAT_ERR_GAUGESTOP 0x06 | |
43 | #define BAT_ERR_OUT_OF_CONTROL 0x07 | |
44 | #define BAT_ERR_ID_FAIL 0x09 | |
45 | #define BAT_ERR_ACR_FAIL 0x10 | |
46 | ||
47 | #define BAT_ADDR_MFR_TYPE 0x5F | |
48 | ||
49 | /********************************************************************* | |
50 | * Power | |
51 | *********************************************************************/ | |
52 | ||
53 | static int olpc_ac_get_prop(struct power_supply *psy, | |
54 | enum power_supply_property psp, | |
55 | union power_supply_propval *val) | |
56 | { | |
57 | int ret = 0; | |
58 | uint8_t status; | |
59 | ||
60 | switch (psp) { | |
61 | case POWER_SUPPLY_PROP_ONLINE: | |
62 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); | |
63 | if (ret) | |
64 | return ret; | |
65 | ||
66 | val->intval = !!(status & BAT_STAT_AC); | |
67 | break; | |
68 | default: | |
69 | ret = -EINVAL; | |
70 | break; | |
71 | } | |
72 | return ret; | |
73 | } | |
74 | ||
75 | static enum power_supply_property olpc_ac_props[] = { | |
76 | POWER_SUPPLY_PROP_ONLINE, | |
77 | }; | |
78 | ||
79 | static struct power_supply olpc_ac = { | |
80 | .name = "olpc-ac", | |
81 | .type = POWER_SUPPLY_TYPE_MAINS, | |
82 | .properties = olpc_ac_props, | |
83 | .num_properties = ARRAY_SIZE(olpc_ac_props), | |
84 | .get_property = olpc_ac_get_prop, | |
85 | }; | |
86 | ||
1ca5b9d2 DW |
87 | static char bat_serial[17]; /* Ick */ |
88 | ||
b2bd8a3b AS |
89 | static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte) |
90 | { | |
91 | if (olpc_platform_info.ecver > 0x44) { | |
92 | if (ec_byte & BAT_STAT_CHARGING) | |
93 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
94 | else if (ec_byte & BAT_STAT_DISCHARGING) | |
95 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
96 | else if (ec_byte & BAT_STAT_FULL) | |
97 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
98 | else /* er,... */ | |
99 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
100 | } else { | |
101 | /* Older EC didn't report charge/discharge bits */ | |
102 | if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */ | |
103 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
104 | else if (ec_byte & BAT_STAT_FULL) | |
105 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
106 | else /* Not _necessarily_ true but EC doesn't tell all yet */ | |
107 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
108 | } | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | static int olpc_bat_get_health(union power_supply_propval *val) | |
114 | { | |
115 | uint8_t ec_byte; | |
116 | int ret; | |
117 | ||
118 | ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); | |
119 | if (ret) | |
120 | return ret; | |
121 | ||
122 | switch (ec_byte) { | |
123 | case 0: | |
124 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
125 | break; | |
126 | ||
127 | case BAT_ERR_OVERTEMP: | |
128 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
129 | break; | |
130 | ||
131 | case BAT_ERR_OVERVOLTAGE: | |
132 | val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; | |
133 | break; | |
134 | ||
135 | case BAT_ERR_INFOFAIL: | |
136 | case BAT_ERR_OUT_OF_CONTROL: | |
137 | case BAT_ERR_ID_FAIL: | |
138 | case BAT_ERR_ACR_FAIL: | |
139 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
140 | break; | |
141 | ||
142 | default: | |
143 | /* Eep. We don't know this failure code */ | |
144 | ret = -EIO; | |
145 | } | |
146 | ||
147 | return ret; | |
148 | } | |
149 | ||
150 | static int olpc_bat_get_mfr(union power_supply_propval *val) | |
151 | { | |
152 | uint8_t ec_byte; | |
153 | int ret; | |
154 | ||
155 | ec_byte = BAT_ADDR_MFR_TYPE; | |
156 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); | |
157 | if (ret) | |
158 | return ret; | |
159 | ||
160 | switch (ec_byte >> 4) { | |
161 | case 1: | |
162 | val->strval = "Gold Peak"; | |
163 | break; | |
164 | case 2: | |
165 | val->strval = "BYD"; | |
166 | break; | |
167 | default: | |
168 | val->strval = "Unknown"; | |
169 | break; | |
170 | } | |
171 | ||
172 | return ret; | |
173 | } | |
174 | ||
175 | static int olpc_bat_get_tech(union power_supply_propval *val) | |
176 | { | |
177 | uint8_t ec_byte; | |
178 | int ret; | |
179 | ||
180 | ec_byte = BAT_ADDR_MFR_TYPE; | |
181 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); | |
182 | if (ret) | |
183 | return ret; | |
184 | ||
185 | switch (ec_byte & 0xf) { | |
186 | case 1: | |
187 | val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH; | |
188 | break; | |
189 | case 2: | |
190 | val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe; | |
191 | break; | |
192 | default: | |
193 | val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN; | |
194 | break; | |
195 | } | |
196 | ||
197 | return ret; | |
198 | } | |
199 | ||
fb972873 DW |
200 | /********************************************************************* |
201 | * Battery properties | |
202 | *********************************************************************/ | |
203 | static int olpc_bat_get_property(struct power_supply *psy, | |
204 | enum power_supply_property psp, | |
205 | union power_supply_propval *val) | |
206 | { | |
207 | int ret = 0; | |
8e9c7716 | 208 | __be16 ec_word; |
fb972873 | 209 | uint8_t ec_byte; |
8e9c7716 | 210 | __be64 ser_buf; |
fb972873 DW |
211 | |
212 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1); | |
213 | if (ret) | |
214 | return ret; | |
215 | ||
216 | /* Theoretically there's a race here -- the battery could be | |
217 | removed immediately after we check whether it's present, and | |
218 | then we query for some other property of the now-absent battery. | |
219 | It doesn't matter though -- the EC will return the last-known | |
220 | information, and it's as if we just ran that _little_ bit faster | |
221 | and managed to read it out before the battery went away. */ | |
222 | if (!(ec_byte & BAT_STAT_PRESENT) && psp != POWER_SUPPLY_PROP_PRESENT) | |
223 | return -ENODEV; | |
224 | ||
225 | switch (psp) { | |
226 | case POWER_SUPPLY_PROP_STATUS: | |
b2bd8a3b AS |
227 | ret = olpc_bat_get_status(val, ec_byte); |
228 | if (ret) | |
229 | return ret; | |
230 | break; | |
fb972873 DW |
231 | case POWER_SUPPLY_PROP_PRESENT: |
232 | val->intval = !!(ec_byte & BAT_STAT_PRESENT); | |
233 | break; | |
234 | ||
235 | case POWER_SUPPLY_PROP_HEALTH: | |
236 | if (ec_byte & BAT_STAT_DESTROY) | |
237 | val->intval = POWER_SUPPLY_HEALTH_DEAD; | |
238 | else { | |
b2bd8a3b | 239 | ret = olpc_bat_get_health(val); |
fb972873 DW |
240 | if (ret) |
241 | return ret; | |
fb972873 DW |
242 | } |
243 | break; | |
244 | ||
245 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
b2bd8a3b | 246 | ret = olpc_bat_get_mfr(val); |
fb972873 DW |
247 | if (ret) |
248 | return ret; | |
fb972873 DW |
249 | break; |
250 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
b2bd8a3b | 251 | ret = olpc_bat_get_tech(val); |
fb972873 DW |
252 | if (ret) |
253 | return ret; | |
fb972873 DW |
254 | break; |
255 | case POWER_SUPPLY_PROP_VOLTAGE_AVG: | |
256 | ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2); | |
257 | if (ret) | |
258 | return ret; | |
259 | ||
8e9c7716 | 260 | val->intval = (int)be16_to_cpu(ec_word) * 9760L / 32; |
fb972873 DW |
261 | break; |
262 | case POWER_SUPPLY_PROP_CURRENT_AVG: | |
263 | ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2); | |
264 | if (ret) | |
265 | return ret; | |
266 | ||
8e9c7716 | 267 | val->intval = (int)be16_to_cpu(ec_word) * 15625L / 120; |
fb972873 DW |
268 | break; |
269 | case POWER_SUPPLY_PROP_CAPACITY: | |
270 | ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1); | |
271 | if (ret) | |
272 | return ret; | |
273 | val->intval = ec_byte; | |
274 | break; | |
fb972873 DW |
275 | case POWER_SUPPLY_PROP_TEMP: |
276 | ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2); | |
277 | if (ret) | |
278 | return ret; | |
8e9c7716 HH |
279 | |
280 | val->intval = (int)be16_to_cpu(ec_word) * 100 / 256; | |
fb972873 DW |
281 | break; |
282 | case POWER_SUPPLY_PROP_TEMP_AMBIENT: | |
283 | ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2); | |
284 | if (ret) | |
285 | return ret; | |
286 | ||
8e9c7716 | 287 | val->intval = (int)be16_to_cpu(ec_word) * 100 / 256; |
fb972873 | 288 | break; |
8e552c36 AS |
289 | case POWER_SUPPLY_PROP_CHARGE_COUNTER: |
290 | ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2); | |
291 | if (ret) | |
292 | return ret; | |
293 | ||
8e9c7716 | 294 | val->intval = (int)be16_to_cpu(ec_word) * 6250 / 15; |
8e552c36 | 295 | break; |
1ca5b9d2 DW |
296 | case POWER_SUPPLY_PROP_SERIAL_NUMBER: |
297 | ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8); | |
298 | if (ret) | |
299 | return ret; | |
300 | ||
301 | sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf)); | |
302 | val->strval = bat_serial; | |
303 | break; | |
fb972873 DW |
304 | default: |
305 | ret = -EINVAL; | |
306 | break; | |
307 | } | |
308 | ||
309 | return ret; | |
310 | } | |
311 | ||
312 | static enum power_supply_property olpc_bat_props[] = { | |
313 | POWER_SUPPLY_PROP_STATUS, | |
314 | POWER_SUPPLY_PROP_PRESENT, | |
315 | POWER_SUPPLY_PROP_HEALTH, | |
316 | POWER_SUPPLY_PROP_TECHNOLOGY, | |
317 | POWER_SUPPLY_PROP_VOLTAGE_AVG, | |
318 | POWER_SUPPLY_PROP_CURRENT_AVG, | |
319 | POWER_SUPPLY_PROP_CAPACITY, | |
fb972873 DW |
320 | POWER_SUPPLY_PROP_TEMP, |
321 | POWER_SUPPLY_PROP_TEMP_AMBIENT, | |
322 | POWER_SUPPLY_PROP_MANUFACTURER, | |
1ca5b9d2 | 323 | POWER_SUPPLY_PROP_SERIAL_NUMBER, |
8e552c36 | 324 | POWER_SUPPLY_PROP_CHARGE_COUNTER, |
fb972873 DW |
325 | }; |
326 | ||
d7eb9e36 AS |
327 | /* EEPROM reading goes completely around the power_supply API, sadly */ |
328 | ||
329 | #define EEPROM_START 0x20 | |
330 | #define EEPROM_END 0x80 | |
331 | #define EEPROM_SIZE (EEPROM_END - EEPROM_START) | |
332 | ||
333 | static ssize_t olpc_bat_eeprom_read(struct kobject *kobj, | |
334 | struct bin_attribute *attr, char *buf, loff_t off, size_t count) | |
335 | { | |
336 | uint8_t ec_byte; | |
337 | int ret, end; | |
338 | ||
339 | if (off >= EEPROM_SIZE) | |
340 | return 0; | |
341 | if (off + count > EEPROM_SIZE) | |
342 | count = EEPROM_SIZE - off; | |
343 | ||
344 | end = EEPROM_START + off + count; | |
345 | for (ec_byte = EEPROM_START + off; ec_byte < end; ec_byte++) { | |
346 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, | |
347 | &buf[ec_byte - EEPROM_START], 1); | |
348 | if (ret) { | |
349 | printk(KERN_ERR "olpc-battery: EC command " | |
350 | "EC_BAT_EEPROM @ 0x%x failed -" | |
351 | " %d!\n", ec_byte, ret); | |
352 | return -EIO; | |
353 | } | |
354 | } | |
355 | ||
356 | return count; | |
357 | } | |
358 | ||
359 | static struct bin_attribute olpc_bat_eeprom = { | |
360 | .attr = { | |
361 | .name = "eeprom", | |
362 | .mode = S_IRUGO, | |
363 | .owner = THIS_MODULE, | |
364 | }, | |
365 | .size = 0, | |
366 | .read = olpc_bat_eeprom_read, | |
367 | }; | |
368 | ||
fb972873 DW |
369 | /********************************************************************* |
370 | * Initialisation | |
371 | *********************************************************************/ | |
372 | ||
373 | static struct platform_device *bat_pdev; | |
374 | ||
375 | static struct power_supply olpc_bat = { | |
376 | .properties = olpc_bat_props, | |
377 | .num_properties = ARRAY_SIZE(olpc_bat_props), | |
378 | .get_property = olpc_bat_get_property, | |
379 | .use_for_apm = 1, | |
380 | }; | |
381 | ||
382 | void olpc_battery_trigger_uevent(unsigned long cause) | |
383 | { | |
384 | if (cause & EC_SCI_SRC_ACPWR) | |
385 | kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE); | |
386 | if (cause & (EC_SCI_SRC_BATERR|EC_SCI_SRC_BATSOC|EC_SCI_SRC_BATTERY)) | |
387 | kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE); | |
388 | } | |
389 | ||
390 | static int __init olpc_bat_init(void) | |
391 | { | |
392 | int ret = 0; | |
393 | uint8_t status; | |
394 | ||
395 | if (!olpc_platform_info.ecver) | |
396 | return -ENXIO; | |
484d6d50 AS |
397 | |
398 | /* | |
399 | * We've seen a number of EC protocol changes; this driver requires | |
400 | * the latest EC protocol, supported by 0x44 and above. | |
401 | */ | |
402 | if (olpc_platform_info.ecver < 0x44) { | |
403 | printk(KERN_NOTICE "OLPC EC version 0x%02x too old for " | |
404 | "battery driver.\n", olpc_platform_info.ecver); | |
fb972873 DW |
405 | return -ENXIO; |
406 | } | |
407 | ||
408 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); | |
409 | if (ret) | |
410 | return ret; | |
411 | ||
412 | /* Ignore the status. It doesn't actually matter */ | |
413 | ||
414 | bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0); | |
415 | if (IS_ERR(bat_pdev)) | |
416 | return PTR_ERR(bat_pdev); | |
417 | ||
418 | ret = power_supply_register(&bat_pdev->dev, &olpc_ac); | |
419 | if (ret) | |
420 | goto ac_failed; | |
421 | ||
422 | olpc_bat.name = bat_pdev->name; | |
423 | ||
424 | ret = power_supply_register(&bat_pdev->dev, &olpc_bat); | |
425 | if (ret) | |
426 | goto battery_failed; | |
427 | ||
d7eb9e36 AS |
428 | ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom); |
429 | if (ret) | |
430 | goto eeprom_failed; | |
431 | ||
fb972873 DW |
432 | goto success; |
433 | ||
d7eb9e36 AS |
434 | eeprom_failed: |
435 | power_supply_unregister(&olpc_bat); | |
fb972873 DW |
436 | battery_failed: |
437 | power_supply_unregister(&olpc_ac); | |
438 | ac_failed: | |
439 | platform_device_unregister(bat_pdev); | |
440 | success: | |
441 | return ret; | |
442 | } | |
443 | ||
444 | static void __exit olpc_bat_exit(void) | |
445 | { | |
d7eb9e36 | 446 | device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom); |
fb972873 DW |
447 | power_supply_unregister(&olpc_bat); |
448 | power_supply_unregister(&olpc_ac); | |
449 | platform_device_unregister(bat_pdev); | |
fb972873 DW |
450 | } |
451 | ||
452 | module_init(olpc_bat_init); | |
453 | module_exit(olpc_bat_exit); | |
454 | ||
455 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
456 | MODULE_LICENSE("GPL"); | |
457 | MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine"); |