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param: fix setting arrays of bool
[linux-2.6/verdex.git] / drivers / power / olpc_battery.c
blob58e419299cd6cdba020042ac9991556803282617
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/err.h>
14 #include <linux/platform_device.h>
15 #include <linux/power_supply.h>
16 #include <linux/jiffies.h>
17 #include <linux/sched.h>
18 #include <asm/olpc.h>
19
20
21 #define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */
22 #define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */
23 #define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */
24 #define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */
25 #define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */
26 #define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */
27 #define EC_BAT_SOC 0x16 /* uint8_t, percentage */
28 #define EC_BAT_SERIAL 0x17 /* uint8_t[6] */
29 #define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */
30 #define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */
31
32 #define BAT_STAT_PRESENT 0x01
33 #define BAT_STAT_FULL 0x02
34 #define BAT_STAT_LOW 0x04
35 #define BAT_STAT_DESTROY 0x08
36 #define BAT_STAT_AC 0x10
37 #define BAT_STAT_CHARGING 0x20
38 #define BAT_STAT_DISCHARGING 0x40
39 #define BAT_STAT_TRICKLE 0x80
40
41 #define BAT_ERR_INFOFAIL 0x02
42 #define BAT_ERR_OVERVOLTAGE 0x04
43 #define BAT_ERR_OVERTEMP 0x05
44 #define BAT_ERR_GAUGESTOP 0x06
45 #define BAT_ERR_OUT_OF_CONTROL 0x07
46 #define BAT_ERR_ID_FAIL 0x09
47 #define BAT_ERR_ACR_FAIL 0x10
48
49 #define BAT_ADDR_MFR_TYPE 0x5F
50
51 /*********************************************************************
52 * Power
53 *********************************************************************/
54
55 static int olpc_ac_get_prop(struct power_supply *psy,
56 enum power_supply_property psp,
57 union power_supply_propval *val)
58 {
59 int ret = 0;
60 uint8_t status;
61
62 switch (psp) {
63 case POWER_SUPPLY_PROP_ONLINE:
64 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
65 if (ret)
66 return ret;
67
68 val->intval = !!(status & BAT_STAT_AC);
69 break;
70 default:
71 ret = -EINVAL;
72 break;
73 }
74 return ret;
75 }
76
77 static enum power_supply_property olpc_ac_props[] = {
78 POWER_SUPPLY_PROP_ONLINE,
79 };
80
81 static struct power_supply olpc_ac = {
82 .name = "olpc-ac",
83 .type = POWER_SUPPLY_TYPE_MAINS,
84 .properties = olpc_ac_props,
85 .num_properties = ARRAY_SIZE(olpc_ac_props),
86 .get_property = olpc_ac_get_prop,
87 };
88
89 static char bat_serial[17]; /* Ick */
90
91 static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte)
92 {
93 if (olpc_platform_info.ecver > 0x44) {
94 if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
95 val->intval = POWER_SUPPLY_STATUS_CHARGING;
96 else if (ec_byte & BAT_STAT_DISCHARGING)
97 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
98 else if (ec_byte & BAT_STAT_FULL)
99 val->intval = POWER_SUPPLY_STATUS_FULL;
100 else /* er,... */
101 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
102 } else {
103 /* Older EC didn't report charge/discharge bits */
104 if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */
105 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
106 else if (ec_byte & BAT_STAT_FULL)
107 val->intval = POWER_SUPPLY_STATUS_FULL;
108 else /* Not _necessarily_ true but EC doesn't tell all yet */
109 val->intval = POWER_SUPPLY_STATUS_CHARGING;
110 }
111
112 return 0;
113 }
114
115 static int olpc_bat_get_health(union power_supply_propval *val)
116 {
117 uint8_t ec_byte;
118 int ret;
119
120 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
121 if (ret)
122 return ret;
123
124 switch (ec_byte) {
125 case 0:
126 val->intval = POWER_SUPPLY_HEALTH_GOOD;
127 break;
128
129 case BAT_ERR_OVERTEMP:
130 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
131 break;
132
133 case BAT_ERR_OVERVOLTAGE:
134 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
135 break;
136
137 case BAT_ERR_INFOFAIL:
138 case BAT_ERR_OUT_OF_CONTROL:
139 case BAT_ERR_ID_FAIL:
140 case BAT_ERR_ACR_FAIL:
141 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
142 break;
143
144 default:
145 /* Eep. We don't know this failure code */
146 ret = -EIO;
147 }
148
149 return ret;
150 }
151
152 static int olpc_bat_get_mfr(union power_supply_propval *val)
153 {
154 uint8_t ec_byte;
155 int ret;
156
157 ec_byte = BAT_ADDR_MFR_TYPE;
158 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
159 if (ret)
160 return ret;
161
162 switch (ec_byte >> 4) {
163 case 1:
164 val->strval = "Gold Peak";
165 break;
166 case 2:
167 val->strval = "BYD";
168 break;
169 default:
170 val->strval = "Unknown";
171 break;
172 }
173
174 return ret;
175 }
176
177 static int olpc_bat_get_tech(union power_supply_propval *val)
178 {
179 uint8_t ec_byte;
180 int ret;
181
182 ec_byte = BAT_ADDR_MFR_TYPE;
183 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
184 if (ret)
185 return ret;
186
187 switch (ec_byte & 0xf) {
188 case 1:
189 val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
190 break;
191 case 2:
192 val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe;
193 break;
194 default:
195 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
196 break;
197 }
198
199 return ret;
200 }
201
202 /*********************************************************************
203 * Battery properties
204 *********************************************************************/
205 static int olpc_bat_get_property(struct power_supply *psy,
206 enum power_supply_property psp,
207 union power_supply_propval *val)
208 {
209 int ret = 0;
210 __be16 ec_word;
211 uint8_t ec_byte;
212 __be64 ser_buf;
213
214 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
215 if (ret)
216 return ret;
217
218 /* Theoretically there's a race here -- the battery could be
219 removed immediately after we check whether it's present, and
220 then we query for some other property of the now-absent battery.
221 It doesn't matter though -- the EC will return the last-known
222 information, and it's as if we just ran that _little_ bit faster
223 and managed to read it out before the battery went away. */
224 if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) &&
225 psp != POWER_SUPPLY_PROP_PRESENT)
226 return -ENODEV;
227
228 switch (psp) {
229 case POWER_SUPPLY_PROP_STATUS:
230 ret = olpc_bat_get_status(val, ec_byte);
231 if (ret)
232 return ret;
233 break;
234 case POWER_SUPPLY_PROP_PRESENT:
235 val->intval = !!(ec_byte & (BAT_STAT_PRESENT |
236 BAT_STAT_TRICKLE));
237 break;
238
239 case POWER_SUPPLY_PROP_HEALTH:
240 if (ec_byte & BAT_STAT_DESTROY)
241 val->intval = POWER_SUPPLY_HEALTH_DEAD;
242 else {
243 ret = olpc_bat_get_health(val);
244 if (ret)
245 return ret;
246 }
247 break;
248
249 case POWER_SUPPLY_PROP_MANUFACTURER:
250 ret = olpc_bat_get_mfr(val);
251 if (ret)
252 return ret;
253 break;
254 case POWER_SUPPLY_PROP_TECHNOLOGY:
255 ret = olpc_bat_get_tech(val);
256 if (ret)
257 return ret;
258 break;
259 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
260 ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
261 if (ret)
262 return ret;
263
264 val->intval = (int)be16_to_cpu(ec_word) * 9760L / 32;
265 break;
266 case POWER_SUPPLY_PROP_CURRENT_AVG:
267 ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
268 if (ret)
269 return ret;
270
271 val->intval = (int)be16_to_cpu(ec_word) * 15625L / 120;
272 break;
273 case POWER_SUPPLY_PROP_CAPACITY:
274 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
275 if (ret)
276 return ret;
277 val->intval = ec_byte;
278 break;
279 case POWER_SUPPLY_PROP_TEMP:
280 ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
281 if (ret)
282 return ret;
283
284 val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
285 break;
286 case POWER_SUPPLY_PROP_TEMP_AMBIENT:
287 ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
288 if (ret)
289 return ret;
290
291 val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
292 break;
293 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
294 ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
295 if (ret)
296 return ret;
297
298 val->intval = (int)be16_to_cpu(ec_word) * 6250 / 15;
299 break;
300 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
301 ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
302 if (ret)
303 return ret;
304
305 sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
306 val->strval = bat_serial;
307 break;
308 default:
309 ret = -EINVAL;
310 break;
311 }
312
313 return ret;
314 }
315
316 static enum power_supply_property olpc_bat_props[] = {
317 POWER_SUPPLY_PROP_STATUS,
318 POWER_SUPPLY_PROP_PRESENT,
319 POWER_SUPPLY_PROP_HEALTH,
320 POWER_SUPPLY_PROP_TECHNOLOGY,
321 POWER_SUPPLY_PROP_VOLTAGE_AVG,
322 POWER_SUPPLY_PROP_CURRENT_AVG,
323 POWER_SUPPLY_PROP_CAPACITY,
324 POWER_SUPPLY_PROP_TEMP,
325 POWER_SUPPLY_PROP_TEMP_AMBIENT,
326 POWER_SUPPLY_PROP_MANUFACTURER,
327 POWER_SUPPLY_PROP_SERIAL_NUMBER,
328 POWER_SUPPLY_PROP_CHARGE_COUNTER,
329 };
330
331 /* EEPROM reading goes completely around the power_supply API, sadly */
332
333 #define EEPROM_START 0x20
334 #define EEPROM_END 0x80
335 #define EEPROM_SIZE (EEPROM_END - EEPROM_START)
336
337 static ssize_t olpc_bat_eeprom_read(struct kobject *kobj,
338 struct bin_attribute *attr, char *buf, loff_t off, size_t count)
339 {
340 uint8_t ec_byte;
341 int ret;
342 int i;
343
344 if (off >= EEPROM_SIZE)
345 return 0;
346 if (off + count > EEPROM_SIZE)
347 count = EEPROM_SIZE - off;
348
349 for (i = 0; i < count; i++) {
350 ec_byte = EEPROM_START + off + i;
351 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1);
352 if (ret) {
353 pr_err("olpc-battery: "
354 "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n",
355 ec_byte, ret);
356 return -EIO;
357 }
358 }
359
360 return count;
361 }
362
363 static struct bin_attribute olpc_bat_eeprom = {
364 .attr = {
365 .name = "eeprom",
366 .mode = S_IRUGO,
367 .owner = THIS_MODULE,
368 },
369 .size = 0,
370 .read = olpc_bat_eeprom_read,
371 };
372
373 /*********************************************************************
374 * Initialisation
375 *********************************************************************/
376
377 static struct platform_device *bat_pdev;
378
379 static struct power_supply olpc_bat = {
380 .properties = olpc_bat_props,
381 .num_properties = ARRAY_SIZE(olpc_bat_props),
382 .get_property = olpc_bat_get_property,
383 .use_for_apm = 1,
384 };
385
386 void olpc_battery_trigger_uevent(unsigned long cause)
387 {
388 if (cause & EC_SCI_SRC_ACPWR)
389 kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE);
390 if (cause & (EC_SCI_SRC_BATERR|EC_SCI_SRC_BATSOC|EC_SCI_SRC_BATTERY))
391 kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE);
392 }
393
394 static int __init olpc_bat_init(void)
395 {
396 int ret = 0;
397 uint8_t status;
398
399 if (!olpc_platform_info.ecver)
400 return -ENXIO;
401
402 /*
403 * We've seen a number of EC protocol changes; this driver requires
404 * the latest EC protocol, supported by 0x44 and above.
405 */
406 if (olpc_platform_info.ecver < 0x44) {
407 printk(KERN_NOTICE "OLPC EC version 0x%02x too old for "
408 "battery driver.\n", olpc_platform_info.ecver);
409 return -ENXIO;
410 }
411
412 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
413 if (ret)
414 return ret;
415
416 /* Ignore the status. It doesn't actually matter */
417
418 bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0);
419 if (IS_ERR(bat_pdev))
420 return PTR_ERR(bat_pdev);
421
422 ret = power_supply_register(&bat_pdev->dev, &olpc_ac);
423 if (ret)
424 goto ac_failed;
425
426 olpc_bat.name = bat_pdev->name;
427
428 ret = power_supply_register(&bat_pdev->dev, &olpc_bat);
429 if (ret)
430 goto battery_failed;
431
432 ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
433 if (ret)
434 goto eeprom_failed;
435
436 goto success;
437
438 eeprom_failed:
439 power_supply_unregister(&olpc_bat);
440 battery_failed:
441 power_supply_unregister(&olpc_ac);
442 ac_failed:
443 platform_device_unregister(bat_pdev);
444 success:
445 return ret;
446 }
447
448 static void __exit olpc_bat_exit(void)
449 {
450 device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
451 power_supply_unregister(&olpc_bat);
452 power_supply_unregister(&olpc_ac);
453 platform_device_unregister(bat_pdev);
454 }
455
456 module_init(olpc_bat_init);
457 module_exit(olpc_bat_exit);
458
459 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
460 MODULE_LICENSE("GPL");
461 MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");
Verdex Pro support