/
usb_moded-udev.c
633 lines (521 loc) · 19.6 KB
1
/**
2
3
4
* @file usb_moded-udev.c
*
* Copyright (C) 2011 Nokia Corporation. All rights reserved.
5
* Copyright (C) 2013-2019 Jolla Ltd.
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
*
* @author: Philippe De Swert <philippe.de-swert@nokia.com>
* @author: Philippe De Swert <phdeswer@lumi.maa>
* @author: Tapio Rantala <ext-tapio.rantala@nokia.com>
* @author: Philippe De Swert <philippedeswert@gmail.com>
* @author: Philippe De Swert <philippe.deswert@jollamobile.com>
* @author: Jarko Poutiainen <jarko.poutiainen@jollamobile.com>
* @author: Simo Piiroinen <simo.piiroinen@jollamobile.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the Lesser GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the Lesser GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
29
30
#include "usb_moded-udev.h"
31
32
#include "usb_moded-config-private.h"
33
#include "usb_moded-control.h"
34
35
36
37
38
39
#include "usb_moded-dbus-private.h"
#include "usb_moded-log.h"
#include <string.h>
#include <libudev.h>
40
41
42
43
44
45
46
/* ========================================================================= *
* Prototypes
* ========================================================================= */
/* -- umudev -- */
47
48
static gboolean umudev_cable_state_timer_cb (gpointer aptr);
static void umudev_cable_state_stop_timer (void);
49
static void umudev_cable_state_start_timer(gint delay);
50
51
52
53
54
55
static bool umudev_cable_state_connected (void);
static cable_state_t umudev_cable_state_get (void);
static void umudev_cable_state_set (cable_state_t state);
static void umudev_cable_state_changed (void);
static void umudev_cable_state_from_udev (cable_state_t state);
56
57
58
59
60
61
62
63
64
65
66
static void umudev_io_error_cb (gpointer data);
static gboolean umudev_io_input_cb (GIOChannel *iochannel, GIOCondition cond, gpointer data);
static void umudev_parse_properties (struct udev_device *dev, bool initial);
static int umudev_score_as_power_supply(const char *syspath);
gboolean umudev_init (void);
void umudev_quit (void);
/* ========================================================================= *
* Data
* ========================================================================= */
67
/* global variables */
68
69
70
71
72
static struct udev *umudev_object = 0;
static struct udev_monitor *umudev_monitor = 0;
static gchar *umudev_sysname = 0;
static guint umudev_watch_id = 0;
static bool umudev_in_cleanup = false;
73
74
/** Cable state as evaluated from udev events */
75
static cable_state_t umudev_cable_state_current = CABLE_STATE_UNKNOWN;
76
77
/** Cable state considered active by usb-moded */
78
static cable_state_t umudev_cable_state_active = CABLE_STATE_UNKNOWN;
79
80
/** Previously active cable state */
81
static cable_state_t umudev_cable_state_previous = CABLE_STATE_UNKNOWN;
82
83
/** Timer id for delaying: reported by udev -> active in usb-moded */
84
static guint umudev_cable_state_timer_id = 0;
85
static gint umudev_cable_state_timer_delay = -1;
86
87
88
89
/* ========================================================================= *
* cable state
* ========================================================================= */
90
91
static gboolean umudev_cable_state_timer_cb(gpointer aptr)
92
{
93
(void)aptr;
94
umudev_cable_state_timer_id = 0;
95
umudev_cable_state_timer_delay = -1;
96
97
log_debug("trigger delayed transfer to: %s",
98
99
cable_state_repr(umudev_cable_state_current));
umudev_cable_state_set(umudev_cable_state_current);
100
return FALSE;
101
102
}
103
static void umudev_cable_state_stop_timer(void)
104
{
105
if( umudev_cable_state_timer_id ) {
106
log_debug("cancel delayed transfer to: %s",
107
108
109
cable_state_repr(umudev_cable_state_current));
g_source_remove(umudev_cable_state_timer_id),
umudev_cable_state_timer_id = 0;
110
umudev_cable_state_timer_delay = -1;
111
}
112
113
}
114
static void umudev_cable_state_start_timer(gint delay)
115
{
116
117
118
119
if( umudev_cable_state_timer_delay != delay ) {
umudev_cable_state_stop_timer();
}
120
if( !umudev_cable_state_timer_id ) {
121
log_debug("schedule delayed transfer to: %s",
122
123
cable_state_repr(umudev_cable_state_current));
umudev_cable_state_timer_id =
124
g_timeout_add(delay,
125
umudev_cable_state_timer_cb, 0);
126
umudev_cable_state_timer_delay = delay;
127
}
128
129
130
}
static bool
131
umudev_cable_state_connected(void)
132
133
{
bool connected = false;
134
switch( umudev_cable_state_get() ) {
135
136
137
138
139
140
default:
break;
case CABLE_STATE_CHARGER_CONNECTED:
case CABLE_STATE_PC_CONNECTED:
connected = true;
break;
141
}
142
return connected;
143
}
144
145
static cable_state_t umudev_cable_state_get(void)
146
{
147
return umudev_cable_state_active;
148
149
}
150
static void umudev_cable_state_set(cable_state_t state)
151
{
152
umudev_cable_state_stop_timer();
153
154
if( umudev_cable_state_active == state )
155
goto EXIT;
156
157
158
umudev_cable_state_previous = umudev_cable_state_active;
umudev_cable_state_active = state;
159
160
log_debug("cable_state: %s -> %s",
161
162
cable_state_repr(umudev_cable_state_previous),
cable_state_repr(umudev_cable_state_active));
163
164
umudev_cable_state_changed();
165
166
167
168
169
EXIT:
return;
}
170
static void umudev_cable_state_changed(void)
171
172
173
174
175
176
177
178
{
/* The rest of usb-moded separates charger
* and pc connection states... make single
* state tracking compatible with that. */
/* First handle pc/charger disconnect based
* on previous state.
*/
179
switch( umudev_cable_state_previous ) {
180
181
182
183
184
default:
case CABLE_STATE_DISCONNECTED:
/* dontcare */
break;
case CABLE_STATE_CHARGER_CONNECTED:
185
umdbus_send_event_signal(CHARGER_DISCONNECTED);
186
187
break;
case CABLE_STATE_PC_CONNECTED:
188
umdbus_send_event_signal(USB_DISCONNECTED);
189
break;
190
}
191
192
/* Then handle pc/charger connect based
193
194
195
* on current state.
*/
196
switch( umudev_cable_state_active ) {
197
198
199
200
201
default:
case CABLE_STATE_DISCONNECTED:
/* dontcare */
break;
case CABLE_STATE_CHARGER_CONNECTED:
202
umdbus_send_event_signal(CHARGER_CONNECTED);
203
204
break;
case CABLE_STATE_PC_CONNECTED:
205
umdbus_send_event_signal(USB_CONNECTED);
206
break;
207
}
208
209
/* Then act on usb mode */
210
control_set_cable_state(umudev_cable_state_active);
211
212
}
213
static void umudev_cable_state_from_udev(cable_state_t curr)
214
{
215
216
cable_state_t prev = umudev_cable_state_current;
umudev_cable_state_current = curr;
217
218
219
if( prev == curr )
goto EXIT;
220
221
log_debug("reported cable state: %s -> %s",
222
223
cable_state_repr(prev),
cable_state_repr(curr));
224
225
226
227
228
229
230
231
232
233
234
235
/* Because mode transitions are handled synchronously and can thus
* block the usb-moded mainloop, we might end up receiving a bursts
* of stale udev events after returning from mode switch - including
* multiple cable connect / disconnect events due to user replugging
* the cable in frustration of things taking too long.
*/
if( curr == CABLE_STATE_DISCONNECTED ) {
/* If we see any disconnect events, those must be acted on
* immediately to get the 1st disconnect handled.
*/
236
umudev_cable_state_set(curr);
237
238
239
240
241
242
243
244
245
}
else {
/* All other transitions are handled with at least 100 ms delay.
* This should compress multiple stale disconnect + connect
* pairs into single action.
*/
gint delay = 100;
if( curr == CABLE_STATE_PC_CONNECTED && prev != CABLE_STATE_UNKNOWN ) {
246
247
if( delay < usbmoded_get_cable_connection_delay() )
delay = usbmoded_get_cable_connection_delay();
248
249
250
251
}
umudev_cable_state_start_timer(delay);
}
252
253
254
EXIT:
return;
255
256
}
257
258
259
260
261
/* ========================================================================= *
* legacy code
* ========================================================================= */
static void umudev_io_error_cb(gpointer data)
262
{
263
264
265
266
267
268
269
270
271
(void)data;
/* we do not want to restart when we try to clean up */
if( !umudev_in_cleanup ) {
log_debug("USB connection watch destroyed, restarting it\n!");
/* restart trigger */
umudev_quit();
umudev_init();
}
272
273
}
274
static gboolean umudev_io_input_cb(GIOChannel *iochannel, GIOCondition cond, gpointer data)
275
{
276
277
278
279
280
(void)iochannel;
(void)data;
gboolean continue_watching = TRUE;
281
282
/* No code paths are allowed to bypass the common_release_wakelock() call below */
common_acquire_wakelock(USB_MODED_WAKELOCK_PROCESS_INPUT);
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
if( cond & G_IO_IN )
{
/* This normally blocks but G_IO_IN indicates that we can read */
struct udev_device *dev = udev_monitor_receive_device(umudev_monitor);
if( !dev )
{
/* if we get something else something bad happened stop watching to avoid busylooping */
continue_watching = FALSE;
}
else
{
/* check if it is the actual device we want to check */
if( !strcmp(umudev_sysname, udev_device_get_sysname(dev)) )
{
if( !strcmp(udev_device_get_action(dev), "change") )
{
umudev_parse_properties(dev, false);
}
}
udev_device_unref(dev);
}
}
if( cond & (G_IO_ERR | G_IO_HUP | G_IO_NVAL) )
{
/* Unhandled errors turn io watch to virtual busyloop too */
continue_watching = FALSE;
}
if( !continue_watching && umudev_watch_id )
{
umudev_watch_id = 0;
log_crit("udev io watch disabled");
}
319
320
common_release_wakelock(USB_MODED_WAKELOCK_PROCESS_INPUT);
321
322
return continue_watching;
323
324
}
325
static void umudev_parse_properties(struct udev_device *dev, bool initial)
326
{
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
(void)initial;
/* udev properties we are interested in */
const char *power_supply_present = 0;
const char *power_supply_online = 0;
const char *power_supply_type = 0;
/* Assume there is no usb connection until proven otherwise */
bool connected = false;
/* Unless debug logging has been request via command line,
* suppress warnings about potential property issues and/or
* fallback strategies applied (to avoid spamming due to the
* code below seeing the same property values over and over
* again also in stable states).
*/
bool warnings = log_p(LOG_DEBUG);
/*
* Check for present first as some drivers use online for when charging
* is enabled
*/
power_supply_present = udev_device_get_property_value(dev, "POWER_SUPPLY_PRESENT");
if( !power_supply_present ) {
power_supply_present =
power_supply_online = udev_device_get_property_value(dev, "POWER_SUPPLY_ONLINE");
}
if( power_supply_present && !strcmp(power_supply_present, "1") )
connected = true;
/* Transition period = Connection status derived from udev
* events disagrees with usb-moded side bookkeeping. */
360
if( connected != control_get_connection_state() ) {
361
362
363
364
365
366
367
368
369
370
371
/* Enable udev property diagnostic logging */
warnings = true;
/* Block suspend briefly */
usbmoded_delay_suspend();
}
if( !connected ) {
/* Handle: Disconnected */
if( warnings && !power_supply_present )
log_err("No usable power supply indicator\n");
372
umudev_cable_state_from_udev(CABLE_STATE_DISCONNECTED);
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
}
else {
if( warnings && power_supply_online )
log_warning("Using online property\n");
/* At least h4113 i.e. "Xperia XA2 - Dual SIM" seem to have
* POWER_SUPPLY_REAL_TYPE udev property with information
* that usb-moded expects to be in POWER_SUPPLY_TYPE prop.
*/
power_supply_type = udev_device_get_property_value(dev, "POWER_SUPPLY_REAL_TYPE");
if( !power_supply_type )
power_supply_type = udev_device_get_property_value(dev, "POWER_SUPPLY_TYPE");
/*
* Power supply type might not exist also :(
* Send connected event but this will not be able
* to discriminate between charger/cable.
*/
if( !power_supply_type ) {
if( warnings )
log_warning("Fallback since cable detection might not be accurate. "
"Will connect on any voltage on charger.\n");
394
umudev_cable_state_from_udev(CABLE_STATE_PC_CONNECTED);
395
396
397
398
399
400
401
goto cleanup;
}
log_debug("CONNECTED - POWER_SUPPLY_TYPE = %s", power_supply_type);
if( !strcmp(power_supply_type, "USB") ||
!strcmp(power_supply_type, "USB_CDP") ) {
402
umudev_cable_state_from_udev(CABLE_STATE_PC_CONNECTED);
403
404
405
406
}
else if( !strcmp(power_supply_type, "USB_DCP") ||
!strcmp(power_supply_type, "USB_HVDCP") ||
!strcmp(power_supply_type, "USB_HVDCP_3") ) {
407
umudev_cable_state_from_udev(CABLE_STATE_CHARGER_CONNECTED);
408
409
}
else if( !strcmp(power_supply_type, "USB_FLOAT")) {
410
if( !umudev_cable_state_connected() )
411
log_warning("connection type detection failed, assuming charger");
412
umudev_cable_state_from_udev(CABLE_STATE_CHARGER_CONNECTED);
413
414
415
416
}
else if( !strcmp(power_supply_type, "Unknown")) {
// nop
log_warning("unknown connection type reported, assuming disconnected");
417
umudev_cable_state_from_udev(CABLE_STATE_DISCONNECTED);
418
419
420
421
}
else {
if( warnings )
log_warning("unhandled power supply type: %s", power_supply_type);
422
umudev_cable_state_from_udev(CABLE_STATE_DISCONNECTED);
423
424
425
426
427
}
}
cleanup:
return;
428
429
}
430
static int umudev_score_as_power_supply(const char *syspath)
431
{
432
433
434
435
436
437
int score = 0;
struct udev_device *dev = 0;
const char *sysname = 0;
if( !umudev_object )
goto EXIT;
438
439
440
if( !(dev = udev_device_new_from_syspath(umudev_object, syspath)) )
goto EXIT;
441
442
443
444
445
446
447
448
449
450
451
452
453
if( !(sysname = udev_device_get_sysname(dev)) )
goto EXIT;
/* try to assign a weighed score */
/* check that it is not a battery */
if(strstr(sysname, "battery") || strstr(sysname, "BAT"))
goto EXIT;
/* if it contains usb in the name it very likely is good */
if(strstr(sysname, "usb"))
score = score + 10;
454
455
456
457
458
459
460
461
462
463
464
465
466
/* often charger is also mentioned in the name */
if(strstr(sysname, "charger"))
score = score + 5;
/* present property is used to detect activity, however online is better */
if(udev_device_get_property_value(dev, "POWER_SUPPLY_PRESENT"))
score = score + 5;
if(udev_device_get_property_value(dev, "POWER_SUPPLY_ONLINE"))
score = score + 10;
/* type is used to detect if it is a cable or dedicated charger.
467
* Bonus points if it is there. */
468
469
470
471
472
473
474
475
476
if(udev_device_get_property_value(dev, "POWER_SUPPLY_TYPE"))
score = score + 10;
EXIT:
/* clean up */
if( dev )
udev_device_unref(dev);
return score;
477
478
}
479
gboolean umudev_init(void)
480
{
481
gboolean success = FALSE;
482
483
484
485
char *configured_device = NULL;
char *configured_subsystem = NULL;
struct udev_device *dev = 0;
486
GIOChannel *iochannel = 0;
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
int ret = 0;
/* Clear in-cleanup in case of restart */
umudev_in_cleanup = false;
/* Create the udev object */
if( !(umudev_object = udev_new()) ) {
log_err("Can't create umudev_object\n");
goto EXIT;
}
if( !(configured_device = config_find_udev_path()) )
configured_device = g_strdup("/sys/class/power_supply/usb");
if( !(configured_subsystem = config_find_udev_subsystem()) )
configured_subsystem = g_strdup("power_supply");
/* Try with configured / default device */
dev = udev_device_new_from_syspath(umudev_object, configured_device);
/* If needed, try heuristics */
if( !dev ) {
log_debug("Trying to guess $power_supply device.\n");
int current_score = 0;
gchar *current_name = 0;
struct udev_enumerate *list;
struct udev_list_entry *list_entry;
struct udev_list_entry *first_entry;
list = udev_enumerate_new(umudev_object);
udev_enumerate_add_match_subsystem(list, "power_supply");
udev_enumerate_scan_devices(list);
first_entry = udev_enumerate_get_list_entry(list);
udev_list_entry_foreach(list_entry, first_entry) {
const char *name = udev_list_entry_get_name(list_entry);
int score = umudev_score_as_power_supply(name);
if( current_score < score ) {
g_free(current_name);
current_name = g_strdup(name);
current_score = score;
}
}
/* check if we found anything with some kind of score */
if(current_score > 0) {
dev = udev_device_new_from_syspath(umudev_object, current_name);
}
g_free(current_name);
}
/* Give up if no power supply device was found */
if( !dev ) {
log_err("Unable to find $power_supply device.");
/* communicate failure, mainloop will exit and call appropriate clean-up */
goto EXIT;
}
/* Cache device name */
umudev_sysname = g_strdup(udev_device_get_sysname(dev));
log_debug("device name = %s\n", umudev_sysname);
/* Start monitoring for changes */
umudev_monitor = udev_monitor_new_from_netlink(umudev_object, "udev");
if( !umudev_monitor )
{
log_err("Unable to monitor the netlink\n");
/* communicate failure, mainloop will exit and call appropriate clean-up */
goto EXIT;
}
ret = udev_monitor_filter_add_match_subsystem_devtype(umudev_monitor,
configured_subsystem,
NULL);
if(ret != 0)
{
log_err("Udev match failed.\n");
goto EXIT;
}
ret = udev_monitor_enable_receiving(umudev_monitor);
if(ret != 0)
{
log_err("Failed to enable monitor recieving.\n");
goto EXIT;
}
iochannel = g_io_channel_unix_new(udev_monitor_get_fd(umudev_monitor));
if( !iochannel )
goto EXIT;
umudev_watch_id = g_io_add_watch_full(iochannel, 0, G_IO_IN, umudev_io_input_cb, NULL, umudev_io_error_cb);
if( !umudev_watch_id )
goto EXIT;
/* everything went well */
success = TRUE;
/* check initial status */
umudev_parse_properties(dev, true);
EXIT:
/* Cleanup local resources */
if( iochannel )
g_io_channel_unref(iochannel);
if( dev )
udev_device_unref(dev);
g_free(configured_subsystem);
g_free(configured_device);
/* All or nothing */
if( !success )
umudev_quit();
return success;
605
606
}
607
void umudev_quit(void)
608
{
609
umudev_in_cleanup = true;
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
log_debug("HWhal cleanup\n");
if( umudev_watch_id )
{
g_source_remove(umudev_watch_id),
umudev_watch_id = 0;
}
if( umudev_monitor ) {
udev_monitor_unref(umudev_monitor),
umudev_monitor = 0;
}
if( umudev_object ) {
udev_unref(umudev_object),
umudev_object =0 ;
}
g_free(umudev_sysname),
umudev_sysname = 0;
632
umudev_cable_state_stop_timer();
633
}