charger.c revision 209c7b0fad9604d1dde1b74d9f9d577b923469fd 
1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define DEBUG_UEVENTS
18#define CHARGER_KLOG_LEVEL 6
19
20#include <dirent.h>
21#include <errno.h>
22#include <fcntl.h>
23#include <linux/input.h>
24#include <stdbool.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
28#include <sys/poll.h>
29#include <sys/stat.h>
30#include <sys/types.h>
31#include <sys/un.h>
32#include <time.h>
33#include <unistd.h>
34
35#include <sys/socket.h>
36#include <linux/netlink.h>
37
38#include <cutils/android_reboot.h>
39#include <cutils/klog.h>
40#include <cutils/list.h>
41#include <cutils/misc.h>
42#include <cutils/uevent.h>
43
44#include "minui/minui.h"
45
46#ifndef max
47#define max(a,b) ((a) > (b) ? (a) : (b))
48#endif
49
50#ifndef min
51#define min(a,b) ((a) < (b) ? (a) : (b))
52#endif
53
54#define ARRAY_SIZE(x)           (sizeof(x)/sizeof(x[0]))
55
56#define MSEC_PER_SEC            (1000LL)
57#define NSEC_PER_MSEC           (1000000LL)
58
59#define BATTERY_UNKNOWN_TIME    (2 * MSEC_PER_SEC)
60#define POWER_ON_KEY_TIME       (2 * MSEC_PER_SEC)
61#define UNPLUGGED_SHUTDOWN_TIME (10 * MSEC_PER_SEC)
62
63#define BATTERY_FULL_THRESH     95
64
65#define LAST_KMSG_PATH          "/proc/last_kmsg"
66#define LAST_KMSG_MAX_SZ        (32 * 1024)
67
68#define LOGE(x...) do { KLOG_ERROR("charger", x); } while (0)
69#define LOGI(x...) do { KLOG_INFO("charger", x); } while (0)
70#define LOGV(x...) do { KLOG_DEBUG("charger", x); } while (0)
71
72struct key_state {
73    bool pending;
74    bool down;
75    int64_t timestamp;
76};
77
78struct power_supply {
79    struct listnode list;
80    char name[256];
81    char type[32];
82    bool online;
83    bool valid;
84    char cap_path[PATH_MAX];
85};
86
87struct frame {
88    const char *name;
89    int disp_time;
90    int min_capacity;
91    bool level_only;
92
93    gr_surface surface;
94};
95
96struct animation {
97    bool run;
98
99    struct frame *frames;
100    int cur_frame;
101    int num_frames;
102
103    int cur_cycle;
104    int num_cycles;
105
106    /* current capacity being animated */
107    int capacity;
108};
109
110struct charger {
111    int64_t next_screen_transition;
112    int64_t next_key_check;
113    int64_t next_pwr_check;
114
115    struct key_state keys[KEY_MAX + 1];
116    int uevent_fd;
117
118    struct listnode supplies;
119    int num_supplies;
120    int num_supplies_online;
121
122    struct animation *batt_anim;
123    gr_surface surf_unknown;
124
125    struct power_supply *battery;
126};
127
128struct uevent {
129    const char *action;
130    const char *path;
131    const char *subsystem;
132    const char *ps_name;
133    const char *ps_type;
134    const char *ps_online;
135};
136
137static struct frame batt_anim_frames[] = {
138    {
139        .name = "charger/battery_0",
140        .disp_time = 750,
141        .min_capacity = 0,
142    },
143    {
144        .name = "charger/battery_1",
145        .disp_time = 750,
146        .min_capacity = 20,
147    },
148    {
149        .name = "charger/battery_2",
150        .disp_time = 750,
151        .min_capacity = 40,
152    },
153    {
154        .name = "charger/battery_3",
155        .disp_time = 750,
156        .min_capacity = 60,
157    },
158    {
159        .name = "charger/battery_4",
160        .disp_time = 750,
161        .min_capacity = 80,
162        .level_only = true,
163    },
164    {
165        .name = "charger/battery_5",
166        .disp_time = 750,
167        .min_capacity = BATTERY_FULL_THRESH,
168    },
169};
170
171static struct animation battery_animation = {
172    .frames = batt_anim_frames,
173    .num_frames = ARRAY_SIZE(batt_anim_frames),
174    .num_cycles = 3,
175};
176
177static struct charger charger_state = {
178    .batt_anim = &battery_animation,
179};
180
181static int char_width;
182static int char_height;
183
184/* current time in milliseconds */
185static int64_t curr_time_ms(void)
186{
187    struct timespec tm;
188    clock_gettime(CLOCK_MONOTONIC, &tm);
189    return tm.tv_sec * MSEC_PER_SEC + (tm.tv_nsec / NSEC_PER_MSEC);
190}
191
192static void clear_screen(void)
193{
194    gr_color(0, 0, 0, 255);
195    gr_fill(0, 0, gr_fb_width(), gr_fb_height());
196};
197
198#define MAX_KLOG_WRITE_BUF_SZ 256
199
200static void dump_last_kmsg(void)
201{
202    char *buf;
203    char *ptr;
204    unsigned sz = 0;
205    int len;
206
207    LOGI("\n");
208    LOGI("*************** LAST KMSG ***************\n");
209    LOGI("\n");
210    buf = load_file(LAST_KMSG_PATH, &sz);
211    if (!buf || !sz) {
212        LOGI("last_kmsg not found. Cold reset?\n");
213        goto out;
214    }
215
216    len = min(sz, LAST_KMSG_MAX_SZ);
217    ptr = buf + (sz - len);
218
219    while (len > 0) {
220        int cnt = min(len, MAX_KLOG_WRITE_BUF_SZ);
221        char yoink;
222        char *nl;
223
224        nl = memrchr(ptr, '\n', cnt - 1);
225        if (nl)
226            cnt = nl - ptr + 1;
227
228        yoink = ptr[cnt];
229        ptr[cnt] = '\0';
230        klog_write(6, "<6>%s", ptr);
231        ptr[cnt] = yoink;
232
233        len -= cnt;
234        ptr += cnt;
235    }
236
237    free(buf);
238
239out:
240    LOGI("\n");
241    LOGI("************* END LAST KMSG *************\n");
242    LOGI("\n");
243}
244
245static int read_file(const char *path, char *buf, size_t sz)
246{
247    int fd;
248    size_t cnt;
249
250    fd = open(path, O_RDONLY, 0);
251    if (fd < 0)
252        goto err;
253
254    cnt = read(fd, buf, sz - 1);
255    if (cnt <= 0)
256        goto err;
257    buf[cnt] = '\0';
258    if (buf[cnt - 1] == '\n') {
259        cnt--;
260        buf[cnt] = '\0';
261    }
262
263    close(fd);
264    return cnt;
265
266err:
267    if (fd >= 0)
268        close(fd);
269    return -1;
270}
271
272static int read_file_int(const char *path, int *val)
273{
274    char buf[32];
275    int ret;
276    int tmp;
277    char *end;
278
279    ret = read_file(path, buf, sizeof(buf));
280    if (ret < 0)
281        return -1;
282
283    tmp = strtol(buf, &end, 0);
284    if (end == buf ||
285        ((end < buf+sizeof(buf)) && (*end != '\n' && *end != '\0')))
286        goto err;
287
288    *val = tmp;
289    return 0;
290
291err:
292    return -1;
293}
294
295static int get_battery_capacity(struct charger *charger)
296{
297    int ret;
298    int batt_cap = -1;
299
300    if (!charger->battery)
301        return -1;
302
303    ret = read_file_int(charger->battery->cap_path, &batt_cap);
304    if (ret < 0 || batt_cap > 100) {
305        batt_cap = -1;
306    }
307
308    return batt_cap;
309}
310
311static struct power_supply *find_supply(struct charger *charger,
312                                        const char *name)
313{
314    struct listnode *node;
315    struct power_supply *supply;
316
317    list_for_each(node, &charger->supplies) {
318        supply = node_to_item(node, struct power_supply, list);
319        if (!strncmp(name, supply->name, sizeof(supply->name)))
320            return supply;
321    }
322    return NULL;
323}
324
325static struct power_supply *add_supply(struct charger *charger,
326                                       const char *name, const char *type,
327                                       const char *path, bool online)
328{
329    struct power_supply *supply;
330
331    supply = calloc(1, sizeof(struct power_supply));
332    if (!supply)
333        return NULL;
334
335    strlcpy(supply->name, name, sizeof(supply->name));
336    strlcpy(supply->type, type, sizeof(supply->type));
337    snprintf(supply->cap_path, sizeof(supply->cap_path),
338             "/sys/%s/capacity", path);
339    supply->online = online;
340    list_add_tail(&charger->supplies, &supply->list);
341    charger->num_supplies++;
342    LOGV("... added %s %s %d\n", supply->name, supply->type, online);
343    return supply;
344}
345
346static void remove_supply(struct charger *charger, struct power_supply *supply)
347{
348    if (!supply)
349        return;
350    list_remove(&supply->list);
351    charger->num_supplies--;
352    free(supply);
353}
354
355static void parse_uevent(const char *msg, struct uevent *uevent)
356{
357    uevent->action = "";
358    uevent->path = "";
359    uevent->subsystem = "";
360    uevent->ps_name = "";
361    uevent->ps_online = "";
362    uevent->ps_type = "";
363
364    /* currently ignoring SEQNUM */
365    while (*msg) {
366#ifdef DEBUG_UEVENTS
367        LOGV("uevent str: %s\n", msg);
368#endif
369        if (!strncmp(msg, "ACTION=", 7)) {
370            msg += 7;
371            uevent->action = msg;
372        } else if (!strncmp(msg, "DEVPATH=", 8)) {
373            msg += 8;
374            uevent->path = msg;
375        } else if (!strncmp(msg, "SUBSYSTEM=", 10)) {
376            msg += 10;
377            uevent->subsystem = msg;
378        } else if (!strncmp(msg, "POWER_SUPPLY_NAME=", 18)) {
379            msg += 18;
380            uevent->ps_name = msg;
381        } else if (!strncmp(msg, "POWER_SUPPLY_ONLINE=", 20)) {
382            msg += 20;
383            uevent->ps_online = msg;
384        } else if (!strncmp(msg, "POWER_SUPPLY_TYPE=", 18)) {
385            msg += 18;
386            uevent->ps_type = msg;
387        }
388
389        /* advance to after the next \0 */
390        while (*msg++)
391            ;
392    }
393
394    LOGV("event { '%s', '%s', '%s', '%s', '%s', '%s' }\n",
395         uevent->action, uevent->path, uevent->subsystem,
396         uevent->ps_name, uevent->ps_type, uevent->ps_online);
397}
398
399static void process_ps_uevent(struct charger *charger, struct uevent *uevent)
400{
401    int online;
402    char ps_type[32];
403    struct power_supply *supply = NULL;
404    int i;
405    bool was_online = false;
406    bool battery = false;
407
408    if (uevent->ps_type[0] == '\0') {
409        char *path;
410        int ret;
411
412        if (uevent->path[0] == '\0')
413            return;
414        ret = asprintf(&path, "/sys/%s/type", uevent->path);
415        if (ret <= 0)
416            return;
417        ret = read_file(path, ps_type, sizeof(ps_type));
418        free(path);
419        if (ret < 0)
420            return;
421    } else {
422        strlcpy(ps_type, uevent->ps_type, sizeof(ps_type));
423    }
424
425    if (!strncmp(ps_type, "Battery", 7))
426        battery = true;
427
428    online = atoi(uevent->ps_online);
429    supply = find_supply(charger, uevent->ps_name);
430    if (supply) {
431        was_online = supply->online;
432        supply->online = online;
433    }
434
435    if (!strcmp(uevent->action, "add")) {
436        if (!supply) {
437            supply = add_supply(charger, uevent->ps_name, ps_type, uevent->path,
438                                online);
439            if (!supply) {
440                LOGE("cannot add supply '%s' (%s %d)\n", uevent->ps_name,
441                     uevent->ps_type, online);
442                return;
443            }
444            /* only pick up the first battery for now */
445            if (battery && !charger->battery)
446                charger->battery = supply;
447        } else {
448            LOGE("supply '%s' already exists..\n", uevent->ps_name);
449        }
450    } else if (!strcmp(uevent->action, "remove")) {
451        if (supply) {
452            if (charger->battery == supply)
453                charger->battery = NULL;
454            remove_supply(charger, supply);
455            supply = NULL;
456        }
457    } else if (!strcmp(uevent->action, "change")) {
458        if (!supply) {
459            LOGE("power supply '%s' not found ('%s' %d)\n",
460                 uevent->ps_name, ps_type, online);
461            return;
462        }
463    } else {
464        return;
465    }
466
467    /* allow battery to be managed in the supply list but make it not
468     * contribute to online power supplies. */
469    if (!battery) {
470        if (was_online && !online)
471            charger->num_supplies_online--;
472        else if (supply && !was_online && online)
473            charger->num_supplies_online++;
474    }
475
476    LOGI("power supply %s (%s) %s (action=%s num_online=%d num_supplies=%d)\n",
477         uevent->ps_name, ps_type, battery ? "" : online ? "online" : "offline",
478         uevent->action, charger->num_supplies_online, charger->num_supplies);
479}
480
481static void process_uevent(struct charger *charger, struct uevent *uevent)
482{
483    if (!strcmp(uevent->subsystem, "power_supply"))
484        process_ps_uevent(charger, uevent);
485}
486
487#define UEVENT_MSG_LEN  1024
488static int handle_uevent_fd(struct charger *charger, int fd)
489{
490    char msg[UEVENT_MSG_LEN+2];
491    int n;
492
493    if (fd < 0)
494        return -1;
495
496    while (true) {
497        struct uevent uevent;
498
499        n = uevent_kernel_multicast_recv(fd, msg, UEVENT_MSG_LEN);
500        if (n <= 0)
501            break;
502        if (n >= UEVENT_MSG_LEN)   /* overflow -- discard */
503            continue;
504
505        msg[n] = '\0';
506        msg[n+1] = '\0';
507
508        parse_uevent(msg, &uevent);
509        process_uevent(charger, &uevent);
510    }
511
512    return 0;
513}
514
515static int uevent_callback(int fd, short revents, void *data)
516{
517    struct charger *charger = data;
518
519    if (!(revents & POLLIN))
520        return -1;
521    return handle_uevent_fd(charger, fd);
522}
523
524/* force the kernel to regenerate the change events for the existing
525 * devices, if valid */
526static void do_coldboot(struct charger *charger, DIR *d, const char *event,
527                        bool follow_links, int max_depth)
528{
529    struct dirent *de;
530    int dfd, fd;
531
532    dfd = dirfd(d);
533
534    fd = openat(dfd, "uevent", O_WRONLY);
535    if (fd >= 0) {
536        write(fd, event, strlen(event));
537        close(fd);
538        handle_uevent_fd(charger, charger->uevent_fd);
539    }
540
541    while ((de = readdir(d)) && max_depth > 0) {
542        DIR *d2;
543
544        LOGV("looking at '%s'\n", de->d_name);
545
546        if ((de->d_type != DT_DIR && !(de->d_type == DT_LNK && follow_links)) ||
547           de->d_name[0] == '.') {
548            LOGV("skipping '%s' type %d (depth=%d follow=%d)\n",
549                 de->d_name, de->d_type, max_depth, follow_links);
550            continue;
551        }
552        LOGV("can descend into '%s'\n", de->d_name);
553
554        fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY);
555        if (fd < 0) {
556            LOGE("cannot openat %d '%s' (%d: %s)\n", dfd, de->d_name,
557                 errno, strerror(errno));
558            continue;
559        }
560
561        d2 = fdopendir(fd);
562        if (d2 == 0)
563            close(fd);
564        else {
565            LOGV("opened '%s'\n", de->d_name);
566            do_coldboot(charger, d2, event, follow_links, max_depth - 1);
567            closedir(d2);
568        }
569    }
570}
571
572static void coldboot(struct charger *charger, const char *path,
573                     const char *event)
574{
575    char str[256];
576
577    LOGV("doing coldboot '%s' in '%s'\n", event, path);
578    DIR *d = opendir(path);
579    if (d) {
580        snprintf(str, sizeof(str), "%s\n", event);
581        do_coldboot(charger, d, str, true, 1);
582        closedir(d);
583    }
584}
585
586static int draw_text(const char *str, int x, int y)
587{
588    int str_len_px = gr_measure(str);
589
590    if (x < 0)
591        x = (gr_fb_width() - str_len_px) / 2;
592    if (y < 0)
593        y = (gr_fb_height() - char_height) / 2;
594    gr_text(x, y, str);
595
596    return y + char_height;
597}
598
599static void android_green(void)
600{
601    gr_color(0xa4, 0xc6, 0x39, 255);
602}
603
604/* returns the last y-offset of where the surface ends */
605static int draw_surface_centered(struct charger *charger, gr_surface surface)
606{
607    int w;
608    int h;
609    int x;
610    int y;
611
612    w = gr_get_width(surface);
613    h = gr_get_height(surface);
614    x = (gr_fb_width() - w) / 2 ;
615    y = (gr_fb_height() - h) / 2 ;
616
617    LOGV("drawing surface %dx%d+%d+%d\n", w, h, x, y);
618    gr_blit(surface, 0, 0, w, h, x, y);
619    return y + h;
620}
621
622static void draw_unknown(struct charger *charger)
623{
624    int y;
625    if (charger->surf_unknown) {
626        draw_surface_centered(charger, charger->surf_unknown);
627    } else {
628        android_green();
629        y = draw_text("Charging!", -1, -1);
630        draw_text("?\?/100", -1, y + 25);
631    }
632}
633
634static void draw_battery(struct charger *charger)
635{
636    struct animation *batt_anim = charger->batt_anim;
637    struct frame *frame = &batt_anim->frames[batt_anim->cur_frame];
638
639    if (batt_anim->num_frames != 0) {
640        draw_surface_centered(charger, frame->surface);
641        LOGV("drawing frame #%d name=%s min_cap=%d time=%d\n",
642             batt_anim->cur_frame, frame->name, frame->min_capacity,
643             frame->disp_time);
644    }
645}
646
647static void redraw_screen(struct charger *charger)
648{
649    struct animation *batt_anim = charger->batt_anim;
650
651    clear_screen();
652
653    /* try to display *something* */
654    if (batt_anim->capacity < 0 || batt_anim->num_frames == 0)
655        draw_unknown(charger);
656    else
657        draw_battery(charger);
658    gr_flip();
659}
660
661static void kick_animation(struct animation *anim)
662{
663    anim->run = true;
664}
665
666static void reset_animation(struct animation *anim)
667{
668    anim->cur_cycle = 0;
669    anim->cur_frame = 0;
670    anim->run = false;
671}
672
673static void update_screen_state(struct charger *charger, int64_t now)
674{
675    struct animation *batt_anim = charger->batt_anim;
676    int cur_frame;
677    int disp_time;
678
679    if (!batt_anim->run || now < charger->next_screen_transition)
680        return;
681
682    /* animation is over, blank screen and leave */
683    if (batt_anim->cur_cycle == batt_anim->num_cycles) {
684        reset_animation(batt_anim);
685        charger->next_screen_transition = -1;
686        gr_fb_blank(true);
687        LOGV("[%lld] animation done\n", now);
688        return;
689    }
690
691    disp_time = batt_anim->frames[batt_anim->cur_frame].disp_time;
692
693    /* animation starting, set up the animation */
694    if (batt_anim->cur_frame == 0) {
695        int batt_cap;
696        int ret;
697
698        LOGV("[%lld] animation starting\n", now);
699        batt_cap = get_battery_capacity(charger);
700        if (batt_cap >= 0 && batt_anim->num_frames != 0) {
701            int i;
702
703            /* find first frame given current capacity */
704            for (i = 1; i < batt_anim->num_frames; i++) {
705                if (batt_cap < batt_anim->frames[i].min_capacity)
706                    break;
707            }
708            batt_anim->cur_frame = i - 1;
709
710            /* show the first frame for twice as long */
711            disp_time = batt_anim->frames[batt_anim->cur_frame].disp_time * 2;
712        }
713
714        batt_anim->capacity = batt_cap;
715    }
716
717    /* unblank the screen  on first cycle */
718    if (batt_anim->cur_cycle == 0)
719        gr_fb_blank(false);
720
721    /* draw the new frame (@ cur_frame) */
722    redraw_screen(charger);
723
724    /* if we don't have anim frames, we only have one image, so just bump
725     * the cycle counter and exit
726     */
727    if (batt_anim->num_frames == 0 || batt_anim->capacity < 0) {
728        LOGV("[%lld] animation missing or unknown battery status\n", now);
729        charger->next_screen_transition = now + BATTERY_UNKNOWN_TIME;
730        batt_anim->cur_cycle++;
731        return;
732    }
733
734    /* schedule next screen transition */
735    charger->next_screen_transition = now + disp_time;
736
737    /* advance frame cntr to the next valid frame
738     * if necessary, advance cycle cntr, and reset frame cntr
739     */
740    batt_anim->cur_frame++;
741
742    /* if the frame is used for level-only, that is only show it when it's
743     * the current level, skip it during the animation.
744     */
745    while (batt_anim->cur_frame < batt_anim->num_frames &&
746           batt_anim->frames[batt_anim->cur_frame].level_only)
747        batt_anim->cur_frame++;
748    if (batt_anim->cur_frame >= batt_anim->num_frames) {
749        batt_anim->cur_cycle++;
750        batt_anim->cur_frame = 0;
751
752        /* don't reset the cycle counter, since we use that as a signal
753         * in a test above to check if animation is over
754         */
755    }
756}
757
758static int set_key_callback(int code, int value, void *data)
759{
760    struct charger *charger = data;
761    int64_t now = curr_time_ms();
762    int down = !!value;
763
764    if (code > KEY_MAX)
765        return -1;
766
767    /* ignore events that don't modify our state */
768    if (charger->keys[code].down == down)
769        return 0;
770
771    /* only record the down even timestamp, as the amount
772     * of time the key spent not being pressed is not useful */
773    if (down)
774        charger->keys[code].timestamp = now;
775    charger->keys[code].down = down;
776    charger->keys[code].pending = true;
777    if (down) {
778        LOGV("[%lld] key[%d] down\n", now, code);
779    } else {
780        int64_t duration = now - charger->keys[code].timestamp;
781        int64_t secs = duration / 1000;
782        int64_t msecs = duration - secs * 1000;
783        LOGV("[%lld] key[%d] up (was down for %lld.%lldsec)\n", now,
784            code, secs, msecs);
785    }
786
787    return 0;
788}
789
790static void update_input_state(struct charger *charger,
791                               struct input_event *ev)
792{
793    if (ev->type != EV_KEY)
794        return;
795    set_key_callback(ev->code, ev->value, charger);
796}
797
798static void set_next_key_check(struct charger *charger,
799                               struct key_state *key,
800                               int64_t timeout)
801{
802    int64_t then = key->timestamp + timeout;
803
804    if (charger->next_key_check == -1 || then < charger->next_key_check)
805        charger->next_key_check = then;
806}
807
808static void process_key(struct charger *charger, int code, int64_t now)
809{
810    struct key_state *key = &charger->keys[code];
811    int64_t next_key_check;
812
813    if (code == KEY_POWER) {
814        if (key->down) {
815            int64_t reboot_timeout = key->timestamp + POWER_ON_KEY_TIME;
816            if (now >= reboot_timeout) {
817                LOGI("[%lld] rebooting\n", now);
818                android_reboot(ANDROID_RB_RESTART, 0, 0);
819            } else {
820                /* if the key is pressed but timeout hasn't expired,
821                 * make sure we wake up at the right-ish time to check
822                 */
823                set_next_key_check(charger, key, POWER_ON_KEY_TIME);
824            }
825        } else {
826            /* if the power key got released, force screen state cycle */
827            if (key->pending)
828                kick_animation(charger->batt_anim);
829        }
830    }
831
832    key->pending = false;
833}
834
835static void handle_input_state(struct charger *charger, int64_t now)
836{
837    process_key(charger, KEY_POWER, now);
838
839    if (charger->next_key_check != -1 && now > charger->next_key_check)
840        charger->next_key_check = -1;
841}
842
843static void handle_power_supply_state(struct charger *charger, int64_t now)
844{
845    if (charger->num_supplies_online == 0) {
846        if (charger->next_pwr_check == -1) {
847            charger->next_pwr_check = now + UNPLUGGED_SHUTDOWN_TIME;
848            LOGI("[%lld] device unplugged: shutting down in %lld (@ %lld)\n",
849                 now, UNPLUGGED_SHUTDOWN_TIME, charger->next_pwr_check);
850        } else if (now >= charger->next_pwr_check) {
851            LOGI("[%lld] shutting down\n", now);
852            android_reboot(ANDROID_RB_POWEROFF, 0, 0);
853        } else {
854            /* otherwise we already have a shutdown timer scheduled */
855        }
856    } else {
857        /* online supply present, reset shutdown timer if set */
858        if (charger->next_pwr_check != -1) {
859            LOGI("[%lld] device plugged in: shutdown cancelled\n", now);
860            kick_animation(charger->batt_anim);
861        }
862        charger->next_pwr_check = -1;
863    }
864}
865
866static void wait_next_event(struct charger *charger, int64_t now)
867{
868    int64_t next_event = INT64_MAX;
869    int64_t timeout;
870    struct input_event ev;
871    int ret;
872
873    LOGV("[%lld] next screen: %lld next key: %lld next pwr: %lld\n", now,
874         charger->next_screen_transition, charger->next_key_check,
875         charger->next_pwr_check);
876
877    if (charger->next_screen_transition != -1)
878        next_event = charger->next_screen_transition;
879    if (charger->next_key_check != -1 && charger->next_key_check < next_event)
880        next_event = charger->next_key_check;
881    if (charger->next_pwr_check != -1 && charger->next_pwr_check < next_event)
882        next_event = charger->next_pwr_check;
883
884    if (next_event != -1 && next_event != INT64_MAX)
885        timeout = max(0, next_event - now);
886    else
887        timeout = -1;
888    LOGV("[%lld] blocking (%lld)\n", now, timeout);
889    ret = ev_wait((int)timeout);
890    if (!ret)
891        ev_dispatch();
892}
893
894static int input_callback(int fd, short revents, void *data)
895{
896    struct charger *charger = data;
897    struct input_event ev;
898    int ret;
899
900    ret = ev_get_input(fd, revents, &ev);
901    if (ret)
902        return -1;
903    update_input_state(charger, &ev);
904    return 0;
905}
906
907static void event_loop(struct charger *charger)
908{
909    int ret;
910
911    while (true) {
912        int64_t now = curr_time_ms();
913
914        LOGV("[%lld] event_loop()\n", now);
915        handle_input_state(charger, now);
916        handle_power_supply_state(charger, now);
917
918        /* do screen update last in case any of the above want to start
919         * screen transitions (animations, etc)
920         */
921        update_screen_state(charger, now);
922
923        wait_next_event(charger, now);
924    }
925}
926
927int main(int argc, char **argv)
928{
929    int ret;
930    struct charger *charger = &charger_state;
931    int64_t now = curr_time_ms() - 1;
932    int fd;
933    int i;
934
935    list_init(&charger->supplies);
936
937    klog_init();
938    klog_set_level(CHARGER_KLOG_LEVEL);
939
940    dump_last_kmsg();
941
942    LOGI("--------------- STARTING CHARGER MODE ---------------\n");
943
944    gr_init();
945    gr_font_size(&char_width, &char_height);
946
947    ev_init(input_callback, charger);
948
949    fd = uevent_open_socket(64*1024, true);
950    if (fd >= 0) {
951        fcntl(fd, F_SETFL, O_NONBLOCK);
952        ev_add_fd(fd, uevent_callback, charger);
953    }
954    charger->uevent_fd = fd;
955    coldboot(charger, "/sys/class/power_supply", "add");
956
957    ret = res_create_surface("charger/battery_fail", &charger->surf_unknown);
958    if (ret < 0) {
959        LOGE("Cannot load image\n");
960        charger->surf_unknown = NULL;
961    }
962
963    for (i = 0; i < charger->batt_anim->num_frames; i++) {
964        struct frame *frame = &charger->batt_anim->frames[i];
965
966        ret = res_create_surface(frame->name, &frame->surface);
967        if (ret < 0) {
968            LOGE("Cannot load image %s\n", frame->name);
969            /* TODO: free the already allocated surfaces... */
970            charger->batt_anim->num_frames = 0;
971            charger->batt_anim->num_cycles = 1;
972            break;
973        }
974    }
975
976    ev_sync_key_state(set_key_callback, charger);
977
978#ifndef CHARGER_DISABLE_INIT_BLANK
979    gr_fb_blank(true);
980#endif
981
982    charger->next_screen_transition = now - 1;
983    charger->next_key_check = -1;
984    charger->next_pwr_check = -1;
985    reset_animation(charger->batt_anim);
986    kick_animation(charger->batt_anim);
987
988    event_loop(charger);
989
990    return 0;
991}
992