xref: /openbmc/linux/drivers/acpi/sbs.c (revision b04b4f78)
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 ACPI_SBS_CLASS			"sbs"
50 #define ACPI_AC_CLASS			"ac_adapter"
51 #define ACPI_BATTERY_CLASS		"battery"
52 #define ACPI_SBS_DEVICE_NAME		"Smart Battery System"
53 #define ACPI_SBS_FILE_INFO		"info"
54 #define ACPI_SBS_FILE_STATE		"state"
55 #define ACPI_SBS_FILE_ALARM		"alarm"
56 #define ACPI_BATTERY_DIR_NAME		"BAT%i"
57 #define ACPI_AC_DIR_NAME		"AC0"
58 
59 #define ACPI_SBS_NOTIFY_STATUS		0x80
60 #define ACPI_SBS_NOTIFY_INFO		0x81
61 
62 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
63 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
64 MODULE_LICENSE("GPL");
65 
66 static unsigned int cache_time = 1000;
67 module_param(cache_time, uint, 0644);
68 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
69 
70 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
71 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
72 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
73 extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
74 
75 #define MAX_SBS_BAT			4
76 #define ACPI_SBS_BLOCK_MAX		32
77 
78 static const struct acpi_device_id sbs_device_ids[] = {
79 	{"ACPI0002", 0},
80 	{"", 0},
81 };
82 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
83 
84 struct acpi_battery {
85 #ifdef CONFIG_ACPI_SYSFS_POWER
86 	struct power_supply bat;
87 #endif
88 	struct acpi_sbs *sbs;
89 #ifdef CONFIG_ACPI_PROCFS_POWER
90 	struct proc_dir_entry *proc_entry;
91 #endif
92 	unsigned long update_time;
93 	char name[8];
94 	char manufacturer_name[ACPI_SBS_BLOCK_MAX];
95 	char device_name[ACPI_SBS_BLOCK_MAX];
96 	char device_chemistry[ACPI_SBS_BLOCK_MAX];
97 	u16 alarm_capacity;
98 	u16 full_charge_capacity;
99 	u16 design_capacity;
100 	u16 design_voltage;
101 	u16 serial_number;
102 	u16 cycle_count;
103 	u16 temp_now;
104 	u16 voltage_now;
105 	s16 rate_now;
106 	s16 rate_avg;
107 	u16 capacity_now;
108 	u16 state_of_charge;
109 	u16 state;
110 	u16 mode;
111 	u16 spec;
112 	u8 id;
113 	u8 present:1;
114 	u8 have_sysfs_alarm:1;
115 };
116 
117 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
118 
119 struct acpi_sbs {
120 #ifdef CONFIG_ACPI_SYSFS_POWER
121 	struct power_supply charger;
122 #endif
123 	struct acpi_device *device;
124 	struct acpi_smb_hc *hc;
125 	struct mutex lock;
126 #ifdef CONFIG_ACPI_PROCFS_POWER
127 	struct proc_dir_entry *charger_entry;
128 #endif
129 	struct acpi_battery battery[MAX_SBS_BAT];
130 	u8 batteries_supported:4;
131 	u8 manager_present:1;
132 	u8 charger_present:1;
133 };
134 
135 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
136 
137 static inline int battery_scale(int log)
138 {
139 	int scale = 1;
140 	while (log--)
141 		scale *= 10;
142 	return scale;
143 }
144 
145 static inline int acpi_battery_vscale(struct acpi_battery *battery)
146 {
147 	return battery_scale((battery->spec & 0x0f00) >> 8);
148 }
149 
150 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
151 {
152 	return battery_scale((battery->spec & 0xf000) >> 12);
153 }
154 
155 static inline int acpi_battery_mode(struct acpi_battery *battery)
156 {
157 	return (battery->mode & 0x8000);
158 }
159 
160 static inline int acpi_battery_scale(struct acpi_battery *battery)
161 {
162 	return (acpi_battery_mode(battery) ? 10 : 1) *
163 	    acpi_battery_ipscale(battery);
164 }
165 
166 #ifdef CONFIG_ACPI_SYSFS_POWER
167 static int sbs_get_ac_property(struct power_supply *psy,
168 			       enum power_supply_property psp,
169 			       union power_supply_propval *val)
170 {
171 	struct acpi_sbs *sbs = to_acpi_sbs(psy);
172 	switch (psp) {
173 	case POWER_SUPPLY_PROP_ONLINE:
174 		val->intval = sbs->charger_present;
175 		break;
176 	default:
177 		return -EINVAL;
178 	}
179 	return 0;
180 }
181 
182 static int acpi_battery_technology(struct acpi_battery *battery)
183 {
184 	if (!strcasecmp("NiCd", battery->device_chemistry))
185 		return POWER_SUPPLY_TECHNOLOGY_NiCd;
186 	if (!strcasecmp("NiMH", battery->device_chemistry))
187 		return POWER_SUPPLY_TECHNOLOGY_NiMH;
188 	if (!strcasecmp("LION", battery->device_chemistry))
189 		return POWER_SUPPLY_TECHNOLOGY_LION;
190 	if (!strcasecmp("LiP", battery->device_chemistry))
191 		return POWER_SUPPLY_TECHNOLOGY_LIPO;
192 	return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
193 }
194 
195 static int acpi_sbs_battery_get_property(struct power_supply *psy,
196 					 enum power_supply_property psp,
197 					 union power_supply_propval *val)
198 {
199 	struct acpi_battery *battery = to_acpi_battery(psy);
200 
201 	if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
202 		return -ENODEV;
203 	switch (psp) {
204 	case POWER_SUPPLY_PROP_STATUS:
205 		if (battery->rate_now < 0)
206 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
207 		else if (battery->rate_now > 0)
208 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
209 		else
210 			val->intval = POWER_SUPPLY_STATUS_FULL;
211 		break;
212 	case POWER_SUPPLY_PROP_PRESENT:
213 		val->intval = battery->present;
214 		break;
215 	case POWER_SUPPLY_PROP_TECHNOLOGY:
216 		val->intval = acpi_battery_technology(battery);
217 		break;
218 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
219 		val->intval = battery->design_voltage *
220 			acpi_battery_vscale(battery) * 1000;
221 		break;
222 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
223 		val->intval = battery->voltage_now *
224 				acpi_battery_vscale(battery) * 1000;
225 		break;
226 	case POWER_SUPPLY_PROP_CURRENT_NOW:
227 	case POWER_SUPPLY_PROP_POWER_NOW:
228 		val->intval = abs(battery->rate_now) *
229 				acpi_battery_ipscale(battery) * 1000;
230 		break;
231 	case POWER_SUPPLY_PROP_CURRENT_AVG:
232 	case POWER_SUPPLY_PROP_POWER_AVG:
233 		val->intval = abs(battery->rate_avg) *
234 				acpi_battery_ipscale(battery) * 1000;
235 		break;
236 	case POWER_SUPPLY_PROP_CAPACITY:
237 		val->intval = battery->state_of_charge;
238 		break;
239 	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
240 	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
241 		val->intval = battery->design_capacity *
242 			acpi_battery_scale(battery) * 1000;
243 		break;
244 	case POWER_SUPPLY_PROP_CHARGE_FULL:
245 	case POWER_SUPPLY_PROP_ENERGY_FULL:
246 		val->intval = battery->full_charge_capacity *
247 			acpi_battery_scale(battery) * 1000;
248 		break;
249 	case POWER_SUPPLY_PROP_CHARGE_NOW:
250 	case POWER_SUPPLY_PROP_ENERGY_NOW:
251 		val->intval = battery->capacity_now *
252 				acpi_battery_scale(battery) * 1000;
253 		break;
254 	case POWER_SUPPLY_PROP_TEMP:
255 		val->intval = battery->temp_now - 2730;	// dK -> dC
256 		break;
257 	case POWER_SUPPLY_PROP_MODEL_NAME:
258 		val->strval = battery->device_name;
259 		break;
260 	case POWER_SUPPLY_PROP_MANUFACTURER:
261 		val->strval = battery->manufacturer_name;
262 		break;
263 	default:
264 		return -EINVAL;
265 	}
266 	return 0;
267 }
268 
269 static enum power_supply_property sbs_ac_props[] = {
270 	POWER_SUPPLY_PROP_ONLINE,
271 };
272 
273 static enum power_supply_property sbs_charge_battery_props[] = {
274 	POWER_SUPPLY_PROP_STATUS,
275 	POWER_SUPPLY_PROP_PRESENT,
276 	POWER_SUPPLY_PROP_TECHNOLOGY,
277 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
278 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
279 	POWER_SUPPLY_PROP_CURRENT_NOW,
280 	POWER_SUPPLY_PROP_CURRENT_AVG,
281 	POWER_SUPPLY_PROP_CAPACITY,
282 	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
283 	POWER_SUPPLY_PROP_CHARGE_FULL,
284 	POWER_SUPPLY_PROP_CHARGE_NOW,
285 	POWER_SUPPLY_PROP_TEMP,
286 	POWER_SUPPLY_PROP_MODEL_NAME,
287 	POWER_SUPPLY_PROP_MANUFACTURER,
288 };
289 
290 static enum power_supply_property sbs_energy_battery_props[] = {
291 	POWER_SUPPLY_PROP_STATUS,
292 	POWER_SUPPLY_PROP_PRESENT,
293 	POWER_SUPPLY_PROP_TECHNOLOGY,
294 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
295 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
296 	POWER_SUPPLY_PROP_CURRENT_NOW,
297 	POWER_SUPPLY_PROP_CURRENT_AVG,
298 	POWER_SUPPLY_PROP_POWER_NOW,
299 	POWER_SUPPLY_PROP_POWER_AVG,
300 	POWER_SUPPLY_PROP_CAPACITY,
301 	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
302 	POWER_SUPPLY_PROP_ENERGY_FULL,
303 	POWER_SUPPLY_PROP_ENERGY_NOW,
304 	POWER_SUPPLY_PROP_TEMP,
305 	POWER_SUPPLY_PROP_MODEL_NAME,
306 	POWER_SUPPLY_PROP_MANUFACTURER,
307 };
308 
309 #endif
310 
311 /* --------------------------------------------------------------------------
312                             Smart Battery System Management
313    -------------------------------------------------------------------------- */
314 
315 struct acpi_battery_reader {
316 	u8 command;		/* command for battery */
317 	u8 mode;		/* word or block? */
318 	size_t offset;		/* offset inside struct acpi_sbs_battery */
319 };
320 
321 static struct acpi_battery_reader info_readers[] = {
322 	{0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
323 	{0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
324 	{0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
325 	{0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
326 	{0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
327 	{0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
328 	{0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
329 	{0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
330 	{0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
331 	{0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
332 	{0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
333 };
334 
335 static struct acpi_battery_reader state_readers[] = {
336 	{0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
337 	{0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
338 	{0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
339 	{0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
340 	{0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
341 	{0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
342 	{0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
343 };
344 
345 static int acpi_manager_get_info(struct acpi_sbs *sbs)
346 {
347 	int result = 0;
348 	u16 battery_system_info;
349 
350 	result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
351 				 0x04, (u8 *)&battery_system_info);
352 	if (!result)
353 		sbs->batteries_supported = battery_system_info & 0x000f;
354 	return result;
355 }
356 
357 static int acpi_battery_get_info(struct acpi_battery *battery)
358 {
359 	int i, result = 0;
360 
361 	for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
362 		result = acpi_smbus_read(battery->sbs->hc,
363 					 info_readers[i].mode,
364 					 ACPI_SBS_BATTERY,
365 					 info_readers[i].command,
366 					 (u8 *) battery +
367 						info_readers[i].offset);
368 		if (result)
369 			break;
370 	}
371 	return result;
372 }
373 
374 static int acpi_battery_get_state(struct acpi_battery *battery)
375 {
376 	int i, result = 0;
377 
378 	if (battery->update_time &&
379 	    time_before(jiffies, battery->update_time +
380 				msecs_to_jiffies(cache_time)))
381 		return 0;
382 	for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
383 		result = acpi_smbus_read(battery->sbs->hc,
384 					 state_readers[i].mode,
385 					 ACPI_SBS_BATTERY,
386 					 state_readers[i].command,
387 				         (u8 *)battery +
388 						state_readers[i].offset);
389 		if (result)
390 			goto end;
391 	}
392       end:
393 	battery->update_time = jiffies;
394 	return result;
395 }
396 
397 static int acpi_battery_get_alarm(struct acpi_battery *battery)
398 {
399 	return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
400 				 ACPI_SBS_BATTERY, 0x01,
401 				 (u8 *)&battery->alarm_capacity);
402 }
403 
404 static int acpi_battery_set_alarm(struct acpi_battery *battery)
405 {
406 	struct acpi_sbs *sbs = battery->sbs;
407 	u16 value, sel = 1 << (battery->id + 12);
408 
409 	int ret;
410 
411 
412 	if (sbs->manager_present) {
413 		ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
414 				0x01, (u8 *)&value);
415 		if (ret)
416 			goto end;
417 		if ((value & 0xf000) != sel) {
418 			value &= 0x0fff;
419 			value |= sel;
420 		ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
421 					 ACPI_SBS_MANAGER,
422 					 0x01, (u8 *)&value, 2);
423 		if (ret)
424 			goto end;
425 		}
426 	}
427 	ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
428 				0x01, (u8 *)&battery->alarm_capacity, 2);
429       end:
430 	return ret;
431 }
432 
433 static int acpi_ac_get_present(struct acpi_sbs *sbs)
434 {
435 	int result;
436 	u16 status;
437 
438 	result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
439 				 0x13, (u8 *) & status);
440 	if (!result)
441 		sbs->charger_present = (status >> 15) & 0x1;
442 	return result;
443 }
444 
445 #ifdef CONFIG_ACPI_SYSFS_POWER
446 static ssize_t acpi_battery_alarm_show(struct device *dev,
447 					struct device_attribute *attr,
448 					char *buf)
449 {
450 	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
451 	acpi_battery_get_alarm(battery);
452 	return sprintf(buf, "%d\n", battery->alarm_capacity *
453 				acpi_battery_scale(battery) * 1000);
454 }
455 
456 static ssize_t acpi_battery_alarm_store(struct device *dev,
457 					struct device_attribute *attr,
458 					const char *buf, size_t count)
459 {
460 	unsigned long x;
461 	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
462 	if (sscanf(buf, "%ld\n", &x) == 1)
463 		battery->alarm_capacity = x /
464 			(1000 * acpi_battery_scale(battery));
465 	if (battery->present)
466 		acpi_battery_set_alarm(battery);
467 	return count;
468 }
469 
470 static struct device_attribute alarm_attr = {
471 	.attr = {.name = "alarm", .mode = 0644},
472 	.show = acpi_battery_alarm_show,
473 	.store = acpi_battery_alarm_store,
474 };
475 #endif
476 
477 /* --------------------------------------------------------------------------
478                               FS Interface (/proc/acpi)
479    -------------------------------------------------------------------------- */
480 
481 #ifdef CONFIG_ACPI_PROCFS_POWER
482 /* Generic Routines */
483 static int
484 acpi_sbs_add_fs(struct proc_dir_entry **dir,
485 		struct proc_dir_entry *parent_dir,
486 		char *dir_name,
487 		const struct file_operations *info_fops,
488 		const struct file_operations *state_fops,
489 		const struct file_operations *alarm_fops, void *data)
490 {
491 	if (!*dir) {
492 		*dir = proc_mkdir(dir_name, parent_dir);
493 		if (!*dir) {
494 			return -ENODEV;
495 		}
496 	}
497 
498 	/* 'info' [R] */
499 	if (info_fops)
500 		proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
501 				 info_fops, data);
502 
503 	/* 'state' [R] */
504 	if (state_fops)
505 		proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
506 				 state_fops, data);
507 
508 	/* 'alarm' [R/W] */
509 	if (alarm_fops)
510 		proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
511 				 alarm_fops, data);
512 	return 0;
513 }
514 
515 static void
516 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
517 			   struct proc_dir_entry *parent_dir)
518 {
519 	if (*dir) {
520 		remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
521 		remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
522 		remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
523 		remove_proc_entry((*dir)->name, parent_dir);
524 		*dir = NULL;
525 	}
526 }
527 
528 /* Smart Battery Interface */
529 static struct proc_dir_entry *acpi_battery_dir = NULL;
530 
531 static inline char *acpi_battery_units(struct acpi_battery *battery)
532 {
533 	return acpi_battery_mode(battery) ? " mW" : " mA";
534 }
535 
536 
537 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
538 {
539 	struct acpi_battery *battery = seq->private;
540 	struct acpi_sbs *sbs = battery->sbs;
541 	int result = 0;
542 
543 	mutex_lock(&sbs->lock);
544 
545 	seq_printf(seq, "present:                 %s\n",
546 		   (battery->present) ? "yes" : "no");
547 	if (!battery->present)
548 		goto end;
549 
550 	seq_printf(seq, "design capacity:         %i%sh\n",
551 		   battery->design_capacity * acpi_battery_scale(battery),
552 		   acpi_battery_units(battery));
553 	seq_printf(seq, "last full capacity:      %i%sh\n",
554 		   battery->full_charge_capacity * acpi_battery_scale(battery),
555 		   acpi_battery_units(battery));
556 	seq_printf(seq, "battery technology:      rechargeable\n");
557 	seq_printf(seq, "design voltage:          %i mV\n",
558 		   battery->design_voltage * acpi_battery_vscale(battery));
559 	seq_printf(seq, "design capacity warning: unknown\n");
560 	seq_printf(seq, "design capacity low:     unknown\n");
561 	seq_printf(seq, "capacity granularity 1:  unknown\n");
562 	seq_printf(seq, "capacity granularity 2:  unknown\n");
563 	seq_printf(seq, "model number:            %s\n", battery->device_name);
564 	seq_printf(seq, "serial number:           %i\n",
565 		   battery->serial_number);
566 	seq_printf(seq, "battery type:            %s\n",
567 		   battery->device_chemistry);
568 	seq_printf(seq, "OEM info:                %s\n",
569 		   battery->manufacturer_name);
570       end:
571 	mutex_unlock(&sbs->lock);
572 	return result;
573 }
574 
575 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
576 {
577 	return single_open(file, acpi_battery_read_info, PDE(inode)->data);
578 }
579 
580 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
581 {
582 	struct acpi_battery *battery = seq->private;
583 	struct acpi_sbs *sbs = battery->sbs;
584 	int rate;
585 
586 	mutex_lock(&sbs->lock);
587 	seq_printf(seq, "present:                 %s\n",
588 		   (battery->present) ? "yes" : "no");
589 	if (!battery->present)
590 		goto end;
591 
592 	acpi_battery_get_state(battery);
593 	seq_printf(seq, "capacity state:          %s\n",
594 		   (battery->state & 0x0010) ? "critical" : "ok");
595 	seq_printf(seq, "charging state:          %s\n",
596 		   (battery->rate_now < 0) ? "discharging" :
597 		   ((battery->rate_now > 0) ? "charging" : "charged"));
598 	rate = abs(battery->rate_now) * acpi_battery_ipscale(battery);
599 	rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
600 			acpi_battery_vscale(battery)/1000):1;
601 	seq_printf(seq, "present rate:            %d%s\n", rate,
602 		   acpi_battery_units(battery));
603 	seq_printf(seq, "remaining capacity:      %i%sh\n",
604 		   battery->capacity_now * acpi_battery_scale(battery),
605 		   acpi_battery_units(battery));
606 	seq_printf(seq, "present voltage:         %i mV\n",
607 		   battery->voltage_now * acpi_battery_vscale(battery));
608 
609       end:
610 	mutex_unlock(&sbs->lock);
611 	return 0;
612 }
613 
614 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
615 {
616 	return single_open(file, acpi_battery_read_state, PDE(inode)->data);
617 }
618 
619 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
620 {
621 	struct acpi_battery *battery = seq->private;
622 	struct acpi_sbs *sbs = battery->sbs;
623 	int result = 0;
624 
625 	mutex_lock(&sbs->lock);
626 
627 	if (!battery->present) {
628 		seq_printf(seq, "present:                 no\n");
629 		goto end;
630 	}
631 
632 	acpi_battery_get_alarm(battery);
633 	seq_printf(seq, "alarm:                   ");
634 	if (battery->alarm_capacity)
635 		seq_printf(seq, "%i%sh\n",
636 			   battery->alarm_capacity *
637 			   acpi_battery_scale(battery),
638 			   acpi_battery_units(battery));
639 	else
640 		seq_printf(seq, "disabled\n");
641       end:
642 	mutex_unlock(&sbs->lock);
643 	return result;
644 }
645 
646 static ssize_t
647 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
648 			 size_t count, loff_t * ppos)
649 {
650 	struct seq_file *seq = file->private_data;
651 	struct acpi_battery *battery = seq->private;
652 	struct acpi_sbs *sbs = battery->sbs;
653 	char alarm_string[12] = { '\0' };
654 	int result = 0;
655 	mutex_lock(&sbs->lock);
656 	if (!battery->present) {
657 		result = -ENODEV;
658 		goto end;
659 	}
660 	if (count > sizeof(alarm_string) - 1) {
661 		result = -EINVAL;
662 		goto end;
663 	}
664 	if (copy_from_user(alarm_string, buffer, count)) {
665 		result = -EFAULT;
666 		goto end;
667 	}
668 	alarm_string[count] = 0;
669 	battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
670 					acpi_battery_scale(battery);
671 	acpi_battery_set_alarm(battery);
672       end:
673 	mutex_unlock(&sbs->lock);
674 	if (result)
675 		return result;
676 	return count;
677 }
678 
679 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
680 {
681 	return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
682 }
683 
684 static const struct file_operations acpi_battery_info_fops = {
685 	.open = acpi_battery_info_open_fs,
686 	.read = seq_read,
687 	.llseek = seq_lseek,
688 	.release = single_release,
689 	.owner = THIS_MODULE,
690 };
691 
692 static const struct file_operations acpi_battery_state_fops = {
693 	.open = acpi_battery_state_open_fs,
694 	.read = seq_read,
695 	.llseek = seq_lseek,
696 	.release = single_release,
697 	.owner = THIS_MODULE,
698 };
699 
700 static const struct file_operations acpi_battery_alarm_fops = {
701 	.open = acpi_battery_alarm_open_fs,
702 	.read = seq_read,
703 	.write = acpi_battery_write_alarm,
704 	.llseek = seq_lseek,
705 	.release = single_release,
706 	.owner = THIS_MODULE,
707 };
708 
709 /* Legacy AC Adapter Interface */
710 
711 static struct proc_dir_entry *acpi_ac_dir = NULL;
712 
713 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
714 {
715 
716 	struct acpi_sbs *sbs = seq->private;
717 
718 	mutex_lock(&sbs->lock);
719 
720 	seq_printf(seq, "state:                   %s\n",
721 		   sbs->charger_present ? "on-line" : "off-line");
722 
723 	mutex_unlock(&sbs->lock);
724 	return 0;
725 }
726 
727 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
728 {
729 	return single_open(file, acpi_ac_read_state, PDE(inode)->data);
730 }
731 
732 static const struct file_operations acpi_ac_state_fops = {
733 	.open = acpi_ac_state_open_fs,
734 	.read = seq_read,
735 	.llseek = seq_lseek,
736 	.release = single_release,
737 	.owner = THIS_MODULE,
738 };
739 
740 #endif
741 
742 /* --------------------------------------------------------------------------
743                                  Driver Interface
744    -------------------------------------------------------------------------- */
745 static int acpi_battery_read(struct acpi_battery *battery)
746 {
747 	int result = 0, saved_present = battery->present;
748 	u16 state;
749 
750 	if (battery->sbs->manager_present) {
751 		result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
752 				ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
753 		if (!result)
754 			battery->present = state & (1 << battery->id);
755 		state &= 0x0fff;
756 		state |= 1 << (battery->id + 12);
757 		acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
758 				  ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
759 	} else if (battery->id == 0)
760 		battery->present = 1;
761 	if (result || !battery->present)
762 		return result;
763 
764 	if (saved_present != battery->present) {
765 		battery->update_time = 0;
766 		result = acpi_battery_get_info(battery);
767 		if (result)
768 			return result;
769 	}
770 	result = acpi_battery_get_state(battery);
771 	return result;
772 }
773 
774 /* Smart Battery */
775 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
776 {
777 	struct acpi_battery *battery = &sbs->battery[id];
778 	int result;
779 
780 	battery->id = id;
781 	battery->sbs = sbs;
782 	result = acpi_battery_read(battery);
783 	if (result)
784 		return result;
785 
786 	sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
787 #ifdef CONFIG_ACPI_PROCFS_POWER
788 	acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
789 			battery->name, &acpi_battery_info_fops,
790 			&acpi_battery_state_fops, &acpi_battery_alarm_fops,
791 			battery);
792 #endif
793 #ifdef CONFIG_ACPI_SYSFS_POWER
794 	battery->bat.name = battery->name;
795 	battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
796 	if (!acpi_battery_mode(battery)) {
797 		battery->bat.properties = sbs_charge_battery_props;
798 		battery->bat.num_properties =
799 		    ARRAY_SIZE(sbs_charge_battery_props);
800 	} else {
801 		battery->bat.properties = sbs_energy_battery_props;
802 		battery->bat.num_properties =
803 		    ARRAY_SIZE(sbs_energy_battery_props);
804 	}
805 	battery->bat.get_property = acpi_sbs_battery_get_property;
806 	result = power_supply_register(&sbs->device->dev, &battery->bat);
807 	if (result)
808 		goto end;
809 	result = device_create_file(battery->bat.dev, &alarm_attr);
810 	if (result)
811 		goto end;
812 	battery->have_sysfs_alarm = 1;
813       end:
814 #endif
815 	printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
816 	       ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
817 	       battery->name, battery->present ? "present" : "absent");
818 	return result;
819 }
820 
821 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
822 {
823 	struct acpi_battery *battery = &sbs->battery[id];
824 #ifdef CONFIG_ACPI_SYSFS_POWER
825 	if (battery->bat.dev) {
826 		if (battery->have_sysfs_alarm)
827 			device_remove_file(battery->bat.dev, &alarm_attr);
828 		power_supply_unregister(&battery->bat);
829 	}
830 #endif
831 #ifdef CONFIG_ACPI_PROCFS_POWER
832 	if (battery->proc_entry)
833 		acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
834 #endif
835 }
836 
837 static int acpi_charger_add(struct acpi_sbs *sbs)
838 {
839 	int result;
840 
841 	result = acpi_ac_get_present(sbs);
842 	if (result)
843 		goto end;
844 #ifdef CONFIG_ACPI_PROCFS_POWER
845 	result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
846 				 ACPI_AC_DIR_NAME, NULL,
847 				 &acpi_ac_state_fops, NULL, sbs);
848 	if (result)
849 		goto end;
850 #endif
851 #ifdef CONFIG_ACPI_SYSFS_POWER
852 	sbs->charger.name = "sbs-charger";
853 	sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
854 	sbs->charger.properties = sbs_ac_props;
855 	sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
856 	sbs->charger.get_property = sbs_get_ac_property;
857 	power_supply_register(&sbs->device->dev, &sbs->charger);
858 #endif
859 	printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
860 	       ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
861 	       ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
862       end:
863 	return result;
864 }
865 
866 static void acpi_charger_remove(struct acpi_sbs *sbs)
867 {
868 #ifdef CONFIG_ACPI_SYSFS_POWER
869 	if (sbs->charger.dev)
870 		power_supply_unregister(&sbs->charger);
871 #endif
872 #ifdef CONFIG_ACPI_PROCFS_POWER
873 	if (sbs->charger_entry)
874 		acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
875 #endif
876 }
877 
878 static void acpi_sbs_callback(void *context)
879 {
880 	int id;
881 	struct acpi_sbs *sbs = context;
882 	struct acpi_battery *bat;
883 	u8 saved_charger_state = sbs->charger_present;
884 	u8 saved_battery_state;
885 	acpi_ac_get_present(sbs);
886 	if (sbs->charger_present != saved_charger_state) {
887 #ifdef CONFIG_ACPI_PROC_EVENT
888 		acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
889 					      ACPI_SBS_NOTIFY_STATUS,
890 					      sbs->charger_present);
891 #endif
892 #ifdef CONFIG_ACPI_SYSFS_POWER
893 		kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
894 #endif
895 	}
896 	if (sbs->manager_present) {
897 		for (id = 0; id < MAX_SBS_BAT; ++id) {
898 			if (!(sbs->batteries_supported & (1 << id)))
899 				continue;
900 			bat = &sbs->battery[id];
901 			saved_battery_state = bat->present;
902 			acpi_battery_read(bat);
903 			if (saved_battery_state == bat->present)
904 				continue;
905 #ifdef CONFIG_ACPI_PROC_EVENT
906 			acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
907 						      bat->name,
908 						      ACPI_SBS_NOTIFY_STATUS,
909 						      bat->present);
910 #endif
911 #ifdef CONFIG_ACPI_SYSFS_POWER
912 			kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
913 #endif
914 		}
915 	}
916 }
917 
918 static int acpi_sbs_remove(struct acpi_device *device, int type);
919 
920 static int acpi_sbs_add(struct acpi_device *device)
921 {
922 	struct acpi_sbs *sbs;
923 	int result = 0;
924 	int id;
925 
926 	sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
927 	if (!sbs) {
928 		result = -ENOMEM;
929 		goto end;
930 	}
931 
932 	mutex_init(&sbs->lock);
933 
934 	sbs->hc = acpi_driver_data(device->parent);
935 	sbs->device = device;
936 	strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
937 	strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
938 	device->driver_data = sbs;
939 
940 	result = acpi_charger_add(sbs);
941 	if (result)
942 		goto end;
943 
944 	result = acpi_manager_get_info(sbs);
945 	if (!result) {
946 		sbs->manager_present = 1;
947 		for (id = 0; id < MAX_SBS_BAT; ++id)
948 			if ((sbs->batteries_supported & (1 << id)))
949 				acpi_battery_add(sbs, id);
950 	} else
951 		acpi_battery_add(sbs, 0);
952 	acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
953       end:
954 	if (result)
955 		acpi_sbs_remove(device, 0);
956 	return result;
957 }
958 
959 static int acpi_sbs_remove(struct acpi_device *device, int type)
960 {
961 	struct acpi_sbs *sbs;
962 	int id;
963 
964 	if (!device)
965 		return -EINVAL;
966 	sbs = acpi_driver_data(device);
967 	if (!sbs)
968 		return -EINVAL;
969 	mutex_lock(&sbs->lock);
970 	acpi_smbus_unregister_callback(sbs->hc);
971 	for (id = 0; id < MAX_SBS_BAT; ++id)
972 		acpi_battery_remove(sbs, id);
973 	acpi_charger_remove(sbs);
974 	mutex_unlock(&sbs->lock);
975 	mutex_destroy(&sbs->lock);
976 	kfree(sbs);
977 	return 0;
978 }
979 
980 static void acpi_sbs_rmdirs(void)
981 {
982 #ifdef CONFIG_ACPI_PROCFS_POWER
983 	if (acpi_ac_dir) {
984 		acpi_unlock_ac_dir(acpi_ac_dir);
985 		acpi_ac_dir = NULL;
986 	}
987 	if (acpi_battery_dir) {
988 		acpi_unlock_battery_dir(acpi_battery_dir);
989 		acpi_battery_dir = NULL;
990 	}
991 #endif
992 }
993 
994 static int acpi_sbs_resume(struct acpi_device *device)
995 {
996 	struct acpi_sbs *sbs;
997 	if (!device)
998 		return -EINVAL;
999 	sbs = device->driver_data;
1000 	acpi_sbs_callback(sbs);
1001 	return 0;
1002 }
1003 
1004 static struct acpi_driver acpi_sbs_driver = {
1005 	.name = "sbs",
1006 	.class = ACPI_SBS_CLASS,
1007 	.ids = sbs_device_ids,
1008 	.ops = {
1009 		.add = acpi_sbs_add,
1010 		.remove = acpi_sbs_remove,
1011 		.resume = acpi_sbs_resume,
1012 		},
1013 };
1014 
1015 static int __init acpi_sbs_init(void)
1016 {
1017 	int result = 0;
1018 
1019 	if (acpi_disabled)
1020 		return -ENODEV;
1021 #ifdef CONFIG_ACPI_PROCFS_POWER
1022 	acpi_ac_dir = acpi_lock_ac_dir();
1023 	if (!acpi_ac_dir)
1024 		return -ENODEV;
1025 	acpi_battery_dir = acpi_lock_battery_dir();
1026 	if (!acpi_battery_dir) {
1027 		acpi_sbs_rmdirs();
1028 		return -ENODEV;
1029 	}
1030 #endif
1031 	result = acpi_bus_register_driver(&acpi_sbs_driver);
1032 	if (result < 0) {
1033 		acpi_sbs_rmdirs();
1034 		return -ENODEV;
1035 	}
1036 	return 0;
1037 }
1038 
1039 static void __exit acpi_sbs_exit(void)
1040 {
1041 	acpi_bus_unregister_driver(&acpi_sbs_driver);
1042 	acpi_sbs_rmdirs();
1043 	return;
1044 }
1045 
1046 module_init(acpi_sbs_init);
1047 module_exit(acpi_sbs_exit);
1048