xref: /openbmc/linux/drivers/acpi/sbs.c (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
1 /*
2  *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
3  *
4  *  Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5  *  Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
6  *  Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
7  *
8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License as published by
12  *  the Free Software Foundation; either version 2 of the License, or (at
13  *  your option) any later version.
14  *
15  *  This program is distributed in the hope that it will be useful, but
16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  *  General Public License for more details.
19  *
20  *  You should have received a copy of the GNU General Public License along
21  *  with this program; if not, write to the Free Software Foundation, Inc.,
22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23  *
24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25  */
26 
27 #include <linux/init.h>
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/kernel.h>
31 
32 #ifdef CONFIG_ACPI_PROCFS_POWER
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <asm/uaccess.h>
36 #endif
37 
38 #include <linux/acpi.h>
39 #include <linux/timer.h>
40 #include <linux/jiffies.h>
41 #include <linux/delay.h>
42 
43 #ifdef CONFIG_ACPI_SYSFS_POWER
44 #include <linux/power_supply.h>
45 #endif
46 
47 #include "sbshc.h"
48 
49 #define PREFIX "ACPI: "
50 
51 #define ACPI_SBS_CLASS			"sbs"
52 #define ACPI_AC_CLASS			"ac_adapter"
53 #define ACPI_BATTERY_CLASS		"battery"
54 #define ACPI_SBS_DEVICE_NAME		"Smart Battery System"
55 #define ACPI_SBS_FILE_INFO		"info"
56 #define ACPI_SBS_FILE_STATE		"state"
57 #define ACPI_SBS_FILE_ALARM		"alarm"
58 #define ACPI_BATTERY_DIR_NAME		"BAT%i"
59 #define ACPI_AC_DIR_NAME		"AC0"
60 
61 #define ACPI_SBS_NOTIFY_STATUS		0x80
62 #define ACPI_SBS_NOTIFY_INFO		0x81
63 
64 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
65 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
66 MODULE_LICENSE("GPL");
67 
68 static unsigned int cache_time = 1000;
69 module_param(cache_time, uint, 0644);
70 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
71 
72 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
73 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
74 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
75 extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
76 
77 #define MAX_SBS_BAT			4
78 #define ACPI_SBS_BLOCK_MAX		32
79 
80 static const struct acpi_device_id sbs_device_ids[] = {
81 	{"ACPI0002", 0},
82 	{"", 0},
83 };
84 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
85 
86 struct acpi_battery {
87 #ifdef CONFIG_ACPI_SYSFS_POWER
88 	struct power_supply bat;
89 #endif
90 	struct acpi_sbs *sbs;
91 #ifdef CONFIG_ACPI_PROCFS_POWER
92 	struct proc_dir_entry *proc_entry;
93 #endif
94 	unsigned long update_time;
95 	char name[8];
96 	char manufacturer_name[ACPI_SBS_BLOCK_MAX];
97 	char device_name[ACPI_SBS_BLOCK_MAX];
98 	char device_chemistry[ACPI_SBS_BLOCK_MAX];
99 	u16 alarm_capacity;
100 	u16 full_charge_capacity;
101 	u16 design_capacity;
102 	u16 design_voltage;
103 	u16 serial_number;
104 	u16 cycle_count;
105 	u16 temp_now;
106 	u16 voltage_now;
107 	s16 rate_now;
108 	s16 rate_avg;
109 	u16 capacity_now;
110 	u16 state_of_charge;
111 	u16 state;
112 	u16 mode;
113 	u16 spec;
114 	u8 id;
115 	u8 present:1;
116 	u8 have_sysfs_alarm:1;
117 };
118 
119 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
120 
121 struct acpi_sbs {
122 #ifdef CONFIG_ACPI_SYSFS_POWER
123 	struct power_supply charger;
124 #endif
125 	struct acpi_device *device;
126 	struct acpi_smb_hc *hc;
127 	struct mutex lock;
128 #ifdef CONFIG_ACPI_PROCFS_POWER
129 	struct proc_dir_entry *charger_entry;
130 #endif
131 	struct acpi_battery battery[MAX_SBS_BAT];
132 	u8 batteries_supported:4;
133 	u8 manager_present:1;
134 	u8 charger_present:1;
135 };
136 
137 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
138 
139 static inline int battery_scale(int log)
140 {
141 	int scale = 1;
142 	while (log--)
143 		scale *= 10;
144 	return scale;
145 }
146 
147 static inline int acpi_battery_vscale(struct acpi_battery *battery)
148 {
149 	return battery_scale((battery->spec & 0x0f00) >> 8);
150 }
151 
152 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
153 {
154 	return battery_scale((battery->spec & 0xf000) >> 12);
155 }
156 
157 static inline int acpi_battery_mode(struct acpi_battery *battery)
158 {
159 	return (battery->mode & 0x8000);
160 }
161 
162 static inline int acpi_battery_scale(struct acpi_battery *battery)
163 {
164 	return (acpi_battery_mode(battery) ? 10 : 1) *
165 	    acpi_battery_ipscale(battery);
166 }
167 
168 #ifdef CONFIG_ACPI_SYSFS_POWER
169 static int sbs_get_ac_property(struct power_supply *psy,
170 			       enum power_supply_property psp,
171 			       union power_supply_propval *val)
172 {
173 	struct acpi_sbs *sbs = to_acpi_sbs(psy);
174 	switch (psp) {
175 	case POWER_SUPPLY_PROP_ONLINE:
176 		val->intval = sbs->charger_present;
177 		break;
178 	default:
179 		return -EINVAL;
180 	}
181 	return 0;
182 }
183 
184 static int acpi_battery_technology(struct acpi_battery *battery)
185 {
186 	if (!strcasecmp("NiCd", battery->device_chemistry))
187 		return POWER_SUPPLY_TECHNOLOGY_NiCd;
188 	if (!strcasecmp("NiMH", battery->device_chemistry))
189 		return POWER_SUPPLY_TECHNOLOGY_NiMH;
190 	if (!strcasecmp("LION", battery->device_chemistry))
191 		return POWER_SUPPLY_TECHNOLOGY_LION;
192 	if (!strcasecmp("LiP", battery->device_chemistry))
193 		return POWER_SUPPLY_TECHNOLOGY_LIPO;
194 	return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
195 }
196 
197 static int acpi_sbs_battery_get_property(struct power_supply *psy,
198 					 enum power_supply_property psp,
199 					 union power_supply_propval *val)
200 {
201 	struct acpi_battery *battery = to_acpi_battery(psy);
202 
203 	if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
204 		return -ENODEV;
205 	switch (psp) {
206 	case POWER_SUPPLY_PROP_STATUS:
207 		if (battery->rate_now < 0)
208 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
209 		else if (battery->rate_now > 0)
210 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
211 		else
212 			val->intval = POWER_SUPPLY_STATUS_FULL;
213 		break;
214 	case POWER_SUPPLY_PROP_PRESENT:
215 		val->intval = battery->present;
216 		break;
217 	case POWER_SUPPLY_PROP_TECHNOLOGY:
218 		val->intval = acpi_battery_technology(battery);
219 		break;
220 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
221 		val->intval = battery->design_voltage *
222 			acpi_battery_vscale(battery) * 1000;
223 		break;
224 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
225 		val->intval = battery->voltage_now *
226 				acpi_battery_vscale(battery) * 1000;
227 		break;
228 	case POWER_SUPPLY_PROP_CURRENT_NOW:
229 	case POWER_SUPPLY_PROP_POWER_NOW:
230 		val->intval = abs(battery->rate_now) *
231 				acpi_battery_ipscale(battery) * 1000;
232 		break;
233 	case POWER_SUPPLY_PROP_CURRENT_AVG:
234 	case POWER_SUPPLY_PROP_POWER_AVG:
235 		val->intval = abs(battery->rate_avg) *
236 				acpi_battery_ipscale(battery) * 1000;
237 		break;
238 	case POWER_SUPPLY_PROP_CAPACITY:
239 		val->intval = battery->state_of_charge;
240 		break;
241 	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
242 	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
243 		val->intval = battery->design_capacity *
244 			acpi_battery_scale(battery) * 1000;
245 		break;
246 	case POWER_SUPPLY_PROP_CHARGE_FULL:
247 	case POWER_SUPPLY_PROP_ENERGY_FULL:
248 		val->intval = battery->full_charge_capacity *
249 			acpi_battery_scale(battery) * 1000;
250 		break;
251 	case POWER_SUPPLY_PROP_CHARGE_NOW:
252 	case POWER_SUPPLY_PROP_ENERGY_NOW:
253 		val->intval = battery->capacity_now *
254 				acpi_battery_scale(battery) * 1000;
255 		break;
256 	case POWER_SUPPLY_PROP_TEMP:
257 		val->intval = battery->temp_now - 2730;	// dK -> dC
258 		break;
259 	case POWER_SUPPLY_PROP_MODEL_NAME:
260 		val->strval = battery->device_name;
261 		break;
262 	case POWER_SUPPLY_PROP_MANUFACTURER:
263 		val->strval = battery->manufacturer_name;
264 		break;
265 	default:
266 		return -EINVAL;
267 	}
268 	return 0;
269 }
270 
271 static enum power_supply_property sbs_ac_props[] = {
272 	POWER_SUPPLY_PROP_ONLINE,
273 };
274 
275 static enum power_supply_property sbs_charge_battery_props[] = {
276 	POWER_SUPPLY_PROP_STATUS,
277 	POWER_SUPPLY_PROP_PRESENT,
278 	POWER_SUPPLY_PROP_TECHNOLOGY,
279 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
280 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
281 	POWER_SUPPLY_PROP_CURRENT_NOW,
282 	POWER_SUPPLY_PROP_CURRENT_AVG,
283 	POWER_SUPPLY_PROP_CAPACITY,
284 	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
285 	POWER_SUPPLY_PROP_CHARGE_FULL,
286 	POWER_SUPPLY_PROP_CHARGE_NOW,
287 	POWER_SUPPLY_PROP_TEMP,
288 	POWER_SUPPLY_PROP_MODEL_NAME,
289 	POWER_SUPPLY_PROP_MANUFACTURER,
290 };
291 
292 static enum power_supply_property sbs_energy_battery_props[] = {
293 	POWER_SUPPLY_PROP_STATUS,
294 	POWER_SUPPLY_PROP_PRESENT,
295 	POWER_SUPPLY_PROP_TECHNOLOGY,
296 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
297 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
298 	POWER_SUPPLY_PROP_CURRENT_NOW,
299 	POWER_SUPPLY_PROP_CURRENT_AVG,
300 	POWER_SUPPLY_PROP_POWER_NOW,
301 	POWER_SUPPLY_PROP_POWER_AVG,
302 	POWER_SUPPLY_PROP_CAPACITY,
303 	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
304 	POWER_SUPPLY_PROP_ENERGY_FULL,
305 	POWER_SUPPLY_PROP_ENERGY_NOW,
306 	POWER_SUPPLY_PROP_TEMP,
307 	POWER_SUPPLY_PROP_MODEL_NAME,
308 	POWER_SUPPLY_PROP_MANUFACTURER,
309 };
310 
311 #endif
312 
313 /* --------------------------------------------------------------------------
314                             Smart Battery System Management
315    -------------------------------------------------------------------------- */
316 
317 struct acpi_battery_reader {
318 	u8 command;		/* command for battery */
319 	u8 mode;		/* word or block? */
320 	size_t offset;		/* offset inside struct acpi_sbs_battery */
321 };
322 
323 static struct acpi_battery_reader info_readers[] = {
324 	{0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
325 	{0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
326 	{0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
327 	{0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
328 	{0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
329 	{0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
330 	{0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
331 	{0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
332 	{0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
333 	{0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
334 	{0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
335 };
336 
337 static struct acpi_battery_reader state_readers[] = {
338 	{0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
339 	{0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
340 	{0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
341 	{0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
342 	{0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
343 	{0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
344 	{0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
345 };
346 
347 static int acpi_manager_get_info(struct acpi_sbs *sbs)
348 {
349 	int result = 0;
350 	u16 battery_system_info;
351 
352 	result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
353 				 0x04, (u8 *)&battery_system_info);
354 	if (!result)
355 		sbs->batteries_supported = battery_system_info & 0x000f;
356 	return result;
357 }
358 
359 static int acpi_battery_get_info(struct acpi_battery *battery)
360 {
361 	int i, result = 0;
362 
363 	for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
364 		result = acpi_smbus_read(battery->sbs->hc,
365 					 info_readers[i].mode,
366 					 ACPI_SBS_BATTERY,
367 					 info_readers[i].command,
368 					 (u8 *) battery +
369 						info_readers[i].offset);
370 		if (result)
371 			break;
372 	}
373 	return result;
374 }
375 
376 static int acpi_battery_get_state(struct acpi_battery *battery)
377 {
378 	int i, result = 0;
379 
380 	if (battery->update_time &&
381 	    time_before(jiffies, battery->update_time +
382 				msecs_to_jiffies(cache_time)))
383 		return 0;
384 	for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
385 		result = acpi_smbus_read(battery->sbs->hc,
386 					 state_readers[i].mode,
387 					 ACPI_SBS_BATTERY,
388 					 state_readers[i].command,
389 				         (u8 *)battery +
390 						state_readers[i].offset);
391 		if (result)
392 			goto end;
393 	}
394       end:
395 	battery->update_time = jiffies;
396 	return result;
397 }
398 
399 static int acpi_battery_get_alarm(struct acpi_battery *battery)
400 {
401 	return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
402 				 ACPI_SBS_BATTERY, 0x01,
403 				 (u8 *)&battery->alarm_capacity);
404 }
405 
406 static int acpi_battery_set_alarm(struct acpi_battery *battery)
407 {
408 	struct acpi_sbs *sbs = battery->sbs;
409 	u16 value, sel = 1 << (battery->id + 12);
410 
411 	int ret;
412 
413 
414 	if (sbs->manager_present) {
415 		ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
416 				0x01, (u8 *)&value);
417 		if (ret)
418 			goto end;
419 		if ((value & 0xf000) != sel) {
420 			value &= 0x0fff;
421 			value |= sel;
422 		ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
423 					 ACPI_SBS_MANAGER,
424 					 0x01, (u8 *)&value, 2);
425 		if (ret)
426 			goto end;
427 		}
428 	}
429 	ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
430 				0x01, (u8 *)&battery->alarm_capacity, 2);
431       end:
432 	return ret;
433 }
434 
435 static int acpi_ac_get_present(struct acpi_sbs *sbs)
436 {
437 	int result;
438 	u16 status;
439 
440 	result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
441 				 0x13, (u8 *) & status);
442 	if (!result)
443 		sbs->charger_present = (status >> 15) & 0x1;
444 	return result;
445 }
446 
447 #ifdef CONFIG_ACPI_SYSFS_POWER
448 static ssize_t acpi_battery_alarm_show(struct device *dev,
449 					struct device_attribute *attr,
450 					char *buf)
451 {
452 	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
453 	acpi_battery_get_alarm(battery);
454 	return sprintf(buf, "%d\n", battery->alarm_capacity *
455 				acpi_battery_scale(battery) * 1000);
456 }
457 
458 static ssize_t acpi_battery_alarm_store(struct device *dev,
459 					struct device_attribute *attr,
460 					const char *buf, size_t count)
461 {
462 	unsigned long x;
463 	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
464 	if (sscanf(buf, "%ld\n", &x) == 1)
465 		battery->alarm_capacity = x /
466 			(1000 * acpi_battery_scale(battery));
467 	if (battery->present)
468 		acpi_battery_set_alarm(battery);
469 	return count;
470 }
471 
472 static struct device_attribute alarm_attr = {
473 	.attr = {.name = "alarm", .mode = 0644},
474 	.show = acpi_battery_alarm_show,
475 	.store = acpi_battery_alarm_store,
476 };
477 #endif
478 
479 /* --------------------------------------------------------------------------
480                               FS Interface (/proc/acpi)
481    -------------------------------------------------------------------------- */
482 
483 #ifdef CONFIG_ACPI_PROCFS_POWER
484 /* Generic Routines */
485 static int
486 acpi_sbs_add_fs(struct proc_dir_entry **dir,
487 		struct proc_dir_entry *parent_dir,
488 		char *dir_name,
489 		const struct file_operations *info_fops,
490 		const struct file_operations *state_fops,
491 		const struct file_operations *alarm_fops, void *data)
492 {
493 	if (!*dir) {
494 		*dir = proc_mkdir(dir_name, parent_dir);
495 		if (!*dir) {
496 			return -ENODEV;
497 		}
498 	}
499 
500 	/* 'info' [R] */
501 	if (info_fops)
502 		proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
503 				 info_fops, data);
504 
505 	/* 'state' [R] */
506 	if (state_fops)
507 		proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
508 				 state_fops, data);
509 
510 	/* 'alarm' [R/W] */
511 	if (alarm_fops)
512 		proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
513 				 alarm_fops, data);
514 	return 0;
515 }
516 
517 static void
518 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
519 			   struct proc_dir_entry *parent_dir)
520 {
521 	if (*dir) {
522 		remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
523 		remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
524 		remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
525 		remove_proc_entry((*dir)->name, parent_dir);
526 		*dir = NULL;
527 	}
528 }
529 
530 /* Smart Battery Interface */
531 static struct proc_dir_entry *acpi_battery_dir = NULL;
532 
533 static inline char *acpi_battery_units(struct acpi_battery *battery)
534 {
535 	return acpi_battery_mode(battery) ? " mW" : " mA";
536 }
537 
538 
539 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
540 {
541 	struct acpi_battery *battery = seq->private;
542 	struct acpi_sbs *sbs = battery->sbs;
543 	int result = 0;
544 
545 	mutex_lock(&sbs->lock);
546 
547 	seq_printf(seq, "present:                 %s\n",
548 		   (battery->present) ? "yes" : "no");
549 	if (!battery->present)
550 		goto end;
551 
552 	seq_printf(seq, "design capacity:         %i%sh\n",
553 		   battery->design_capacity * acpi_battery_scale(battery),
554 		   acpi_battery_units(battery));
555 	seq_printf(seq, "last full capacity:      %i%sh\n",
556 		   battery->full_charge_capacity * acpi_battery_scale(battery),
557 		   acpi_battery_units(battery));
558 	seq_printf(seq, "battery technology:      rechargeable\n");
559 	seq_printf(seq, "design voltage:          %i mV\n",
560 		   battery->design_voltage * acpi_battery_vscale(battery));
561 	seq_printf(seq, "design capacity warning: unknown\n");
562 	seq_printf(seq, "design capacity low:     unknown\n");
563 	seq_printf(seq, "capacity granularity 1:  unknown\n");
564 	seq_printf(seq, "capacity granularity 2:  unknown\n");
565 	seq_printf(seq, "model number:            %s\n", battery->device_name);
566 	seq_printf(seq, "serial number:           %i\n",
567 		   battery->serial_number);
568 	seq_printf(seq, "battery type:            %s\n",
569 		   battery->device_chemistry);
570 	seq_printf(seq, "OEM info:                %s\n",
571 		   battery->manufacturer_name);
572       end:
573 	mutex_unlock(&sbs->lock);
574 	return result;
575 }
576 
577 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
578 {
579 	return single_open(file, acpi_battery_read_info, PDE(inode)->data);
580 }
581 
582 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
583 {
584 	struct acpi_battery *battery = seq->private;
585 	struct acpi_sbs *sbs = battery->sbs;
586 	int rate;
587 
588 	mutex_lock(&sbs->lock);
589 	seq_printf(seq, "present:                 %s\n",
590 		   (battery->present) ? "yes" : "no");
591 	if (!battery->present)
592 		goto end;
593 
594 	acpi_battery_get_state(battery);
595 	seq_printf(seq, "capacity state:          %s\n",
596 		   (battery->state & 0x0010) ? "critical" : "ok");
597 	seq_printf(seq, "charging state:          %s\n",
598 		   (battery->rate_now < 0) ? "discharging" :
599 		   ((battery->rate_now > 0) ? "charging" : "charged"));
600 	rate = abs(battery->rate_now) * acpi_battery_ipscale(battery);
601 	rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
602 			acpi_battery_vscale(battery)/1000):1;
603 	seq_printf(seq, "present rate:            %d%s\n", rate,
604 		   acpi_battery_units(battery));
605 	seq_printf(seq, "remaining capacity:      %i%sh\n",
606 		   battery->capacity_now * acpi_battery_scale(battery),
607 		   acpi_battery_units(battery));
608 	seq_printf(seq, "present voltage:         %i mV\n",
609 		   battery->voltage_now * acpi_battery_vscale(battery));
610 
611       end:
612 	mutex_unlock(&sbs->lock);
613 	return 0;
614 }
615 
616 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
617 {
618 	return single_open(file, acpi_battery_read_state, PDE(inode)->data);
619 }
620 
621 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
622 {
623 	struct acpi_battery *battery = seq->private;
624 	struct acpi_sbs *sbs = battery->sbs;
625 	int result = 0;
626 
627 	mutex_lock(&sbs->lock);
628 
629 	if (!battery->present) {
630 		seq_printf(seq, "present:                 no\n");
631 		goto end;
632 	}
633 
634 	acpi_battery_get_alarm(battery);
635 	seq_printf(seq, "alarm:                   ");
636 	if (battery->alarm_capacity)
637 		seq_printf(seq, "%i%sh\n",
638 			   battery->alarm_capacity *
639 			   acpi_battery_scale(battery),
640 			   acpi_battery_units(battery));
641 	else
642 		seq_printf(seq, "disabled\n");
643       end:
644 	mutex_unlock(&sbs->lock);
645 	return result;
646 }
647 
648 static ssize_t
649 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
650 			 size_t count, loff_t * ppos)
651 {
652 	struct seq_file *seq = file->private_data;
653 	struct acpi_battery *battery = seq->private;
654 	struct acpi_sbs *sbs = battery->sbs;
655 	char alarm_string[12] = { '\0' };
656 	int result = 0;
657 	mutex_lock(&sbs->lock);
658 	if (!battery->present) {
659 		result = -ENODEV;
660 		goto end;
661 	}
662 	if (count > sizeof(alarm_string) - 1) {
663 		result = -EINVAL;
664 		goto end;
665 	}
666 	if (copy_from_user(alarm_string, buffer, count)) {
667 		result = -EFAULT;
668 		goto end;
669 	}
670 	alarm_string[count] = 0;
671 	battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
672 					acpi_battery_scale(battery);
673 	acpi_battery_set_alarm(battery);
674       end:
675 	mutex_unlock(&sbs->lock);
676 	if (result)
677 		return result;
678 	return count;
679 }
680 
681 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
682 {
683 	return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
684 }
685 
686 static const struct file_operations acpi_battery_info_fops = {
687 	.open = acpi_battery_info_open_fs,
688 	.read = seq_read,
689 	.llseek = seq_lseek,
690 	.release = single_release,
691 	.owner = THIS_MODULE,
692 };
693 
694 static const struct file_operations acpi_battery_state_fops = {
695 	.open = acpi_battery_state_open_fs,
696 	.read = seq_read,
697 	.llseek = seq_lseek,
698 	.release = single_release,
699 	.owner = THIS_MODULE,
700 };
701 
702 static const struct file_operations acpi_battery_alarm_fops = {
703 	.open = acpi_battery_alarm_open_fs,
704 	.read = seq_read,
705 	.write = acpi_battery_write_alarm,
706 	.llseek = seq_lseek,
707 	.release = single_release,
708 	.owner = THIS_MODULE,
709 };
710 
711 /* Legacy AC Adapter Interface */
712 
713 static struct proc_dir_entry *acpi_ac_dir = NULL;
714 
715 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
716 {
717 
718 	struct acpi_sbs *sbs = seq->private;
719 
720 	mutex_lock(&sbs->lock);
721 
722 	seq_printf(seq, "state:                   %s\n",
723 		   sbs->charger_present ? "on-line" : "off-line");
724 
725 	mutex_unlock(&sbs->lock);
726 	return 0;
727 }
728 
729 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
730 {
731 	return single_open(file, acpi_ac_read_state, PDE(inode)->data);
732 }
733 
734 static const struct file_operations acpi_ac_state_fops = {
735 	.open = acpi_ac_state_open_fs,
736 	.read = seq_read,
737 	.llseek = seq_lseek,
738 	.release = single_release,
739 	.owner = THIS_MODULE,
740 };
741 
742 #endif
743 
744 /* --------------------------------------------------------------------------
745                                  Driver Interface
746    -------------------------------------------------------------------------- */
747 static int acpi_battery_read(struct acpi_battery *battery)
748 {
749 	int result = 0, saved_present = battery->present;
750 	u16 state;
751 
752 	if (battery->sbs->manager_present) {
753 		result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
754 				ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
755 		if (!result)
756 			battery->present = state & (1 << battery->id);
757 		state &= 0x0fff;
758 		state |= 1 << (battery->id + 12);
759 		acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
760 				  ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
761 	} else if (battery->id == 0)
762 		battery->present = 1;
763 	if (result || !battery->present)
764 		return result;
765 
766 	if (saved_present != battery->present) {
767 		battery->update_time = 0;
768 		result = acpi_battery_get_info(battery);
769 		if (result)
770 			return result;
771 	}
772 	result = acpi_battery_get_state(battery);
773 	return result;
774 }
775 
776 /* Smart Battery */
777 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
778 {
779 	struct acpi_battery *battery = &sbs->battery[id];
780 	int result;
781 
782 	battery->id = id;
783 	battery->sbs = sbs;
784 	result = acpi_battery_read(battery);
785 	if (result)
786 		return result;
787 
788 	sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
789 #ifdef CONFIG_ACPI_PROCFS_POWER
790 	acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
791 			battery->name, &acpi_battery_info_fops,
792 			&acpi_battery_state_fops, &acpi_battery_alarm_fops,
793 			battery);
794 #endif
795 #ifdef CONFIG_ACPI_SYSFS_POWER
796 	battery->bat.name = battery->name;
797 	battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
798 	if (!acpi_battery_mode(battery)) {
799 		battery->bat.properties = sbs_charge_battery_props;
800 		battery->bat.num_properties =
801 		    ARRAY_SIZE(sbs_charge_battery_props);
802 	} else {
803 		battery->bat.properties = sbs_energy_battery_props;
804 		battery->bat.num_properties =
805 		    ARRAY_SIZE(sbs_energy_battery_props);
806 	}
807 	battery->bat.get_property = acpi_sbs_battery_get_property;
808 	result = power_supply_register(&sbs->device->dev, &battery->bat);
809 	if (result)
810 		goto end;
811 	result = device_create_file(battery->bat.dev, &alarm_attr);
812 	if (result)
813 		goto end;
814 	battery->have_sysfs_alarm = 1;
815       end:
816 #endif
817 	printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
818 	       ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
819 	       battery->name, battery->present ? "present" : "absent");
820 	return result;
821 }
822 
823 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
824 {
825 	struct acpi_battery *battery = &sbs->battery[id];
826 #ifdef CONFIG_ACPI_SYSFS_POWER
827 	if (battery->bat.dev) {
828 		if (battery->have_sysfs_alarm)
829 			device_remove_file(battery->bat.dev, &alarm_attr);
830 		power_supply_unregister(&battery->bat);
831 	}
832 #endif
833 #ifdef CONFIG_ACPI_PROCFS_POWER
834 	if (battery->proc_entry)
835 		acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
836 #endif
837 }
838 
839 static int acpi_charger_add(struct acpi_sbs *sbs)
840 {
841 	int result;
842 
843 	result = acpi_ac_get_present(sbs);
844 	if (result)
845 		goto end;
846 #ifdef CONFIG_ACPI_PROCFS_POWER
847 	result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
848 				 ACPI_AC_DIR_NAME, NULL,
849 				 &acpi_ac_state_fops, NULL, sbs);
850 	if (result)
851 		goto end;
852 #endif
853 #ifdef CONFIG_ACPI_SYSFS_POWER
854 	sbs->charger.name = "sbs-charger";
855 	sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
856 	sbs->charger.properties = sbs_ac_props;
857 	sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
858 	sbs->charger.get_property = sbs_get_ac_property;
859 	power_supply_register(&sbs->device->dev, &sbs->charger);
860 #endif
861 	printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
862 	       ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
863 	       ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
864       end:
865 	return result;
866 }
867 
868 static void acpi_charger_remove(struct acpi_sbs *sbs)
869 {
870 #ifdef CONFIG_ACPI_SYSFS_POWER
871 	if (sbs->charger.dev)
872 		power_supply_unregister(&sbs->charger);
873 #endif
874 #ifdef CONFIG_ACPI_PROCFS_POWER
875 	if (sbs->charger_entry)
876 		acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
877 #endif
878 }
879 
880 static void acpi_sbs_callback(void *context)
881 {
882 	int id;
883 	struct acpi_sbs *sbs = context;
884 	struct acpi_battery *bat;
885 	u8 saved_charger_state = sbs->charger_present;
886 	u8 saved_battery_state;
887 	acpi_ac_get_present(sbs);
888 	if (sbs->charger_present != saved_charger_state) {
889 #ifdef CONFIG_ACPI_PROC_EVENT
890 		acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
891 					      ACPI_SBS_NOTIFY_STATUS,
892 					      sbs->charger_present);
893 #endif
894 #ifdef CONFIG_ACPI_SYSFS_POWER
895 		kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
896 #endif
897 	}
898 	if (sbs->manager_present) {
899 		for (id = 0; id < MAX_SBS_BAT; ++id) {
900 			if (!(sbs->batteries_supported & (1 << id)))
901 				continue;
902 			bat = &sbs->battery[id];
903 			saved_battery_state = bat->present;
904 			acpi_battery_read(bat);
905 			if (saved_battery_state == bat->present)
906 				continue;
907 #ifdef CONFIG_ACPI_PROC_EVENT
908 			acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
909 						      bat->name,
910 						      ACPI_SBS_NOTIFY_STATUS,
911 						      bat->present);
912 #endif
913 #ifdef CONFIG_ACPI_SYSFS_POWER
914 			kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
915 #endif
916 		}
917 	}
918 }
919 
920 static int acpi_sbs_remove(struct acpi_device *device, int type);
921 
922 static int acpi_sbs_add(struct acpi_device *device)
923 {
924 	struct acpi_sbs *sbs;
925 	int result = 0;
926 	int id;
927 
928 	sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
929 	if (!sbs) {
930 		result = -ENOMEM;
931 		goto end;
932 	}
933 
934 	mutex_init(&sbs->lock);
935 
936 	sbs->hc = acpi_driver_data(device->parent);
937 	sbs->device = device;
938 	strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
939 	strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
940 	device->driver_data = sbs;
941 
942 	result = acpi_charger_add(sbs);
943 	if (result)
944 		goto end;
945 
946 	result = acpi_manager_get_info(sbs);
947 	if (!result) {
948 		sbs->manager_present = 1;
949 		for (id = 0; id < MAX_SBS_BAT; ++id)
950 			if ((sbs->batteries_supported & (1 << id)))
951 				acpi_battery_add(sbs, id);
952 	} else
953 		acpi_battery_add(sbs, 0);
954 	acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
955       end:
956 	if (result)
957 		acpi_sbs_remove(device, 0);
958 	return result;
959 }
960 
961 static int acpi_sbs_remove(struct acpi_device *device, int type)
962 {
963 	struct acpi_sbs *sbs;
964 	int id;
965 
966 	if (!device)
967 		return -EINVAL;
968 	sbs = acpi_driver_data(device);
969 	if (!sbs)
970 		return -EINVAL;
971 	mutex_lock(&sbs->lock);
972 	acpi_smbus_unregister_callback(sbs->hc);
973 	for (id = 0; id < MAX_SBS_BAT; ++id)
974 		acpi_battery_remove(sbs, id);
975 	acpi_charger_remove(sbs);
976 	mutex_unlock(&sbs->lock);
977 	mutex_destroy(&sbs->lock);
978 	kfree(sbs);
979 	return 0;
980 }
981 
982 static void acpi_sbs_rmdirs(void)
983 {
984 #ifdef CONFIG_ACPI_PROCFS_POWER
985 	if (acpi_ac_dir) {
986 		acpi_unlock_ac_dir(acpi_ac_dir);
987 		acpi_ac_dir = NULL;
988 	}
989 	if (acpi_battery_dir) {
990 		acpi_unlock_battery_dir(acpi_battery_dir);
991 		acpi_battery_dir = NULL;
992 	}
993 #endif
994 }
995 
996 static int acpi_sbs_resume(struct acpi_device *device)
997 {
998 	struct acpi_sbs *sbs;
999 	if (!device)
1000 		return -EINVAL;
1001 	sbs = device->driver_data;
1002 	acpi_sbs_callback(sbs);
1003 	return 0;
1004 }
1005 
1006 static struct acpi_driver acpi_sbs_driver = {
1007 	.name = "sbs",
1008 	.class = ACPI_SBS_CLASS,
1009 	.ids = sbs_device_ids,
1010 	.ops = {
1011 		.add = acpi_sbs_add,
1012 		.remove = acpi_sbs_remove,
1013 		.resume = acpi_sbs_resume,
1014 		},
1015 };
1016 
1017 static int __init acpi_sbs_init(void)
1018 {
1019 	int result = 0;
1020 
1021 	if (acpi_disabled)
1022 		return -ENODEV;
1023 #ifdef CONFIG_ACPI_PROCFS_POWER
1024 	acpi_ac_dir = acpi_lock_ac_dir();
1025 	if (!acpi_ac_dir)
1026 		return -ENODEV;
1027 	acpi_battery_dir = acpi_lock_battery_dir();
1028 	if (!acpi_battery_dir) {
1029 		acpi_sbs_rmdirs();
1030 		return -ENODEV;
1031 	}
1032 #endif
1033 	result = acpi_bus_register_driver(&acpi_sbs_driver);
1034 	if (result < 0) {
1035 		acpi_sbs_rmdirs();
1036 		return -ENODEV;
1037 	}
1038 	return 0;
1039 }
1040 
1041 static void __exit acpi_sbs_exit(void)
1042 {
1043 	acpi_bus_unregister_driver(&acpi_sbs_driver);
1044 	acpi_sbs_rmdirs();
1045 	return;
1046 }
1047 
1048 module_init(acpi_sbs_init);
1049 module_exit(acpi_sbs_exit);
1050