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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
24#define EC_BAT_CURRENT 0x11
25#define EC_BAT_ACR 0x12
26#define EC_BAT_TEMP 0x13
27#define EC_AMB_TEMP 0x14
28#define EC_BAT_STATUS 0x15
29#define EC_BAT_SOC 0x16
30#define EC_BAT_SERIAL 0x17
31#define EC_BAT_EEPROM 0x18
32#define EC_BAT_ERRCODE 0x1f
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
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
91static char bat_serial[17];
92
93static 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
103 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
104 } else {
105
106 if (!(ec_byte & BAT_STAT_AC))
107 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
108 else if (ec_byte & BAT_STAT_FULL)
109 val->intval = POWER_SUPPLY_STATUS_FULL;
110 else
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
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
204
205
206
207static 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
221
222
223
224
225
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
334static 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
352
353#define EEPROM_START 0x20
354#define EEPROM_END 0x80
355#define EEPROM_SIZE (EEPROM_END - EEPROM_START)
356
357static ssize_t olpc_bat_eeprom_read(struct file *filp, 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
383static 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
394
395static 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
408static 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
418
419
420static struct platform_device *bat_pdev;
421
422static 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
429void 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
437static 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
447
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
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
485error_failed:
486 device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
487eeprom_failed:
488 power_supply_unregister(&olpc_bat);
489battery_failed:
490 power_supply_unregister(&olpc_ac);
491ac_failed:
492 platform_device_unregister(bat_pdev);
493success:
494 return ret;
495}
496
497static 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
506module_init(olpc_bat_init);
507module_exit(olpc_bat_exit);
508
509MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
510MODULE_LICENSE("GPL");
511MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");
512
