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usbms.c
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usbms.c
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/*
KoboUSBMS: USBMS helper for KOReader
Copyright (C) 2020-2024 NiLuJe <[email protected]>
SPDX-License-Identifier: GPL-3.0-or-later
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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 GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "usbms.h"
// Wrapper function to use syslog as a libevdev log handler
// c.f., libevdev_dflt_log_func @ libevdev/libevdev.c
__attribute__((format(printf, 7, 0))) static void
libevdev_to_syslog(const struct libevdev* dev __attribute__((unused)),
enum libevdev_log_priority priority,
void* data __attribute__((unused)),
const char* file,
int line,
const char* func,
const char* format,
va_list args)
{
const char* prefix;
switch (priority) {
case LIBEVDEV_LOG_ERROR:
prefix = "libevdev error";
break;
case LIBEVDEV_LOG_INFO:
prefix = "libevdev info";
break;
case LIBEVDEV_LOG_DEBUG:
prefix = "libevdev debug";
break;
default:
prefix = "libevdev INVALID LOG PRIORITY";
break;
}
if (priority == LIBEVDEV_LOG_DEBUG) {
syslog(LOG_INFO, "%s in %s:%d:%s:", prefix, file, line, func);
} else {
syslog(LOG_INFO, "%s in %s:", prefix, func);
}
vsyslog(LOG_INFO, format, args);
}
static void
setup_usb_ids(DEVICE_ID_T device_code)
{
// Map device IDs to USB Product IDs, as we're going to need that in the scripts
// c.f., https://github.com/kovidgoyal/calibre/blob/9d881ed2fcff219887579571f1bb48bdf41437d4/src/calibre/devices/kobo/driver.py#L1402-L1416
// c.f., https://github.com/baskerville/plato/blob/d96e40737060b569ae875f37d6d741fd5ccc802c/contrib/plato.sh#L38-L56
// NOTE: Keep 'em in FBInk order to make my life easier
uint32_t pid = 0xDEAD;
switch (device_code) {
case DEVICE_KOBO_TOUCH_A: // Touch A (trilogy)
case DEVICE_KOBO_TOUCH_B: // Touch B (trilogy)
case DEVICE_KOBO_TOUCH_C: // Touch C (trilogy)
pid = 0x4163;
break;
case DEVICE_KOBO_MINI: // Mini (pixie)
pid = 0x4183;
break;
case DEVICE_KOBO_GLO: // Glo (kraken)
pid = 0x4173;
break;
case DEVICE_KOBO_GLO_HD: // Glo HD (alyssum)
pid = 0x4223;
break;
case DEVICE_KOBO_TOUCH_2: // Touch 2.0 (pika)
pid = 0x4224;
break;
case DEVICE_KOBO_AURA: // Aura (phoenix)
pid = 0x4203;
break;
case DEVICE_KOBO_AURA_HD: // Aura HD (dragon)
pid = 0x4193;
break;
case DEVICE_KOBO_AURA_H2O: // Aura H2O (dahlia)
pid = 0x4213;
break;
case DEVICE_KOBO_AURA_H2O_2: // Aura H2O² (snow)
case DEVICE_KOBO_AURA_H2O_2_R2: // Aura H2O² r2 (snow)
pid = 0x4227;
break;
case DEVICE_KOBO_AURA_ONE: // Aura ONE (daylight)
case DEVICE_KOBO_AURA_ONE_LE: // Aura ONE LE (daylight)
pid = 0x4225;
break;
case DEVICE_KOBO_AURA_SE: // Aura SE (star)
case DEVICE_KOBO_AURA_SE_R2: // Aura SE r2 (star)
pid = 0x4226;
break;
case DEVICE_KOBO_CLARA_HD: // Clara HD (nova)
pid = 0x4228;
break;
case DEVICE_KOBO_FORMA: // Forma (frost)
case DEVICE_KOBO_FORMA_32GB: // Forma 32GB (frost)
pid = 0x4229;
break;
case DEVICE_KOBO_LIBRA_H2O: // Libra H2O (storm)
pid = 0x4232;
break;
case DEVICE_KOBO_NIA: // Nia (luna)
pid = 0x4230;
break;
case DEVICE_KOBO_ELIPSA: // Elipsa (europa)
pid = 0x4233;
break;
case DEVICE_KOBO_LIBRA_2: // Libra 2 (io)
pid = 0x4234;
break;
case DEVICE_KOBO_SAGE: // Sage (cadmus)
pid = 0x4231;
break;
case DEVICE_KOBO_CLARA_2E: // Clara 2E (goldfinch)
pid = 0x4235;
break;
case DEVICE_KOBO_ELIPSA_2E: // Elipsa 2E (condor)
pid = 0x4236;
break;
case DEVICE_KOBO_LIBRA_COLOUR: // Kobo Libra Colour (monza)
pid = 0x4237;
break;
case DEVICE_TOLINO_VISION_COLOR: // Tolino Vision Color (monza)
pid = 0x5237;
break;
case DEVICE_KOBO_CLARA_BW: // Kobo Clara B&W (spa)
pid = 0x4239;
break;
case DEVICE_TOLINO_SHINE_BW: // Tolino Shine B&W (spa)
pid = 0x5239;
break;
case DEVICE_KOBO_CLARA_COLOUR: // Kobo Clara Colour (spa)
pid = 0x4238;
break;
case DEVICE_TOLINO_SHINE_COLOR: // Tolino Shine Color (spa)
pid = 0x5238;
break;
case 0U:
pid = 0x4163;
break;
default:
PFLOG(LOG_WARNING, "Can't match device code (%hu) to a USB Product ID!", device_code);
break;
}
// Push it to the env…
char pid_str[8] = { 0 };
snprintf(pid_str, sizeof(pid_str) - 1U, "0x%04X", pid);
PFLOG(LOG_NOTICE, "USB product ID: %s", pid_str);
setenv("USB_PRODUCT_ID", pid_str, 1);
}
static bool
ioctl_is_usb_plugged(int ntxfd, bool foo __attribute__((unused)))
{
// Check if we're plugged in…
unsigned long ptr = 0U;
int rc = ioctl(ntxfd, CM_USB_Plug_IN, &ptr);
if (rc == -1) {
PFLOG(LOG_WARNING, "Could not query USB status (ioctl: %m)");
}
return !!ptr;
}
static bool
sysfs_is_usb_plugged(int foo __attribute__((unused)), bool log_status)
{
bool is_plugged = false;
FILE* f = fopen(BATT_STATUS_SYSFS, "re");
if (f) {
char status[16] = { 0 };
size_t size = fread(status, sizeof(*status), sizeof(status) - 1U, f);
fclose(f);
if (size > 0) {
// Strip trailing LF
if (status[size - 1U] == '\n') {
status[size - 1U] = '\0';
}
if (log_status) {
LOG(LOG_DEBUG, "Battery status: %s", status);
}
} else {
LOG(LOG_WARNING, "Could not read the battery status from sysfs!");
}
// c.f., power_supply_show_property @ drivers/power/supply/power_supply_sysfs.c
// & include/linux/power_supply.h
// NOTE: Match the behavior of the NXP ntx_io ioctl (c.f., _Is_USB_plugged):
// false if discharging, true otherwise.
// NOTE: The charger type check ought to then confirm that…
if (strncmp(status, "Unknown", 7U) == 0U) {
is_plugged = true;
} else if (strncmp(status, "Charging", 8U) == 0U) {
is_plugged = true;
} else if (strncmp(status, "Discharging", 11U) == 0U) {
is_plugged = false;
} else if (strncmp(status, "Not charging", 12U) == 0U) {
is_plugged = true;
} else if (strncmp(status, "Full", 4U) == 0U) {
is_plugged = true;
}
}
return is_plugged;
}
static bool
sysfs_is_usb_online(int foo __attribute__((unused)), bool log_status)
{
bool is_plugged = false;
FILE* f = fopen(USB_ONLINE_SYSFS, "re");
if (f) {
char status[16] = { 0 };
size_t size = fread(status, sizeof(*status), sizeof(status) - 1U, f);
fclose(f);
if (size > 0) {
// Strip trailing LF
if (status[size - 1U] == '\n') {
status[size - 1U] = '\0';
}
if (log_status) {
LOG(LOG_DEBUG, "USB power supply online: %s", status);
}
} else {
LOG(LOG_WARNING, "Could not read the usb online entry from sysfs!");
}
// NOTE: Match the behavior of the NXP ntx_io ioctl (c.f., _Is_USB_plugged when HWConfig says PMIC == BD71828):
// false if 0, true otherwise.
// NOTE: The charger type check ought to then confirm that…
if (status[0] == '0') {
is_plugged = false;
} else {
is_plugged = true;
}
}
return is_plugged;
}
// Check if the standalone USB-C controller thinks there's something plugged in
// c.f., drivers/input/misc/P15USB30216C.c
static int
is_usbc_plugged(bool log_status)
{
// Only found on a few Mk. 8 & Mk. 9 boards...
if (!USBC_PLUG_SYSFS) {
return -1;
}
FILE* f = fopen(USBC_PLUG_SYSFS, "re");
if (!f) {
return -1;
}
bool is_plugged = false;
char usbc_conn[8] = { 0 };
size_t size = fread(usbc_conn, sizeof(*usbc_conn), sizeof(usbc_conn) - 1U, f);
fclose(f);
f = NULL;
if (size > 0) {
// Strip trailing LF
if (usbc_conn[size - 1U] == '\n') {
usbc_conn[size - 1U] = '\0';
}
}
// Should only ever be 0 or 1
// NOTE: The i2c read exposes more information about what kind of device is on the other end of the cable,
// but that information is, sadly, lost to us (it *is* printed to dmesg, at least).
if (usbc_conn[0] == '1') {
is_plugged = true;
}
if (log_status) {
LOG(LOG_DEBUG,
"Standalone USB-C controller cable detection: %s",
is_plugged ? "Connected" : "Disconnected");
}
return is_plugged;
}
// Return a fancy battery icon given the charge percentage…
static const char*
get_battery_icon(uint8_t charge)
{
if (charge >= 100) {
return "\U000f0079";
} else if (charge >= 90) {
return "\U000f0082";
} else if (charge >= 80) {
return "\U000f0081";
} else if (charge >= 70) {
return "\U000f0080";
} else if (charge >= 60) {
return "\U000f007f";
} else if (charge >= 50) {
return "\U000f007e";
} else if (charge >= 40) {
return "\U000f007d";
} else if (charge >= 30) {
return "\U000f007c";
} else if (charge >= 20) {
return "\U000f007b";
} else if (charge >= 10) {
return "\U000f007a";
} else {
return "\U000f0083";
}
}
// NOTE: Inspired from git's strtoul_ui @ git-compat-util.h
static int
strtoul_hhu(const char* str, uint8_t* restrict result)
{
// NOTE: We want to *reject* negative values (which strtoul does not)!
if (strchr(str, '-')) {
PFLOG(LOG_WARNING, "Passed a negative value (`%s`) to strtoul_hhu", str);
return -EINVAL;
}
// Now that we know it's positive, we can go on with strtoul…
char* endptr;
errno = 0; // To distinguish success/failure after call
unsigned long int val = strtoul(str, &endptr, 10);
if ((errno == ERANGE && val == ULONG_MAX) || (errno != 0 && val == 0)) {
PFLOG(LOG_WARNING, "strtoul: %m");
return -EINVAL;
}
// NOTE: It fact, always clamp to CHAR_MAX, since we may need to cast to a signed representation later.
if (val > CHAR_MAX) {
PFLOG(LOG_WARNING, "Passed a value larger than CHAR_MAX to strtoul_hhu, clamping it down to CHAR_MAX");
val = CHAR_MAX;
}
if (endptr == str) {
PFLOG(LOG_WARNING, "No digits were found in value `%s` assigned to a variable expecting an uint8_t", str);
return -EINVAL;
}
// If we got here, strtoul() successfully parsed at least part of a number.
// But we do want to enforce the fact that the input really was *only* an integer value.
if (*endptr != '\0') {
PFLOG(
LOG_WARNING,
"Found trailing characters (`%s`) behind value '%lu' assigned from string `%s` to a variable expecting an uint8_t",
endptr,
val,
str);
return -EINVAL;
}
// Make sure there isn't a loss of precision on this arch when casting explicitly
if ((uint8_t) val != val) {
PFLOG(LOG_WARNING, "Loss of precision when casting value '%lu' to an uint8_t.", val);
return -EINVAL;
}
*result = (uint8_t) val;
return EXIT_SUCCESS;
}
// Pilfered from NickelMenu ;).
// c.f., https://github.com/pgaskin/NickelMenu/blob/85cd558715886069e70cbdcb1f9de43843e49e9f/src/util.h#L14-L23
static char*
strtrim(char* s)
{
if (!s) {
return NULL;
}
char* a = s;
char* b = s + strlen(s);
for (; a < b && isspace((unsigned char) (*a)); a++) {
;
}
for (; b > a && isspace((unsigned char) (*(b - 1))); b--) {
;
}
*b = '\0';
return a;
}
// Based on timespecsub from <bsd/sys/time.h>
static void
timespec_delta(struct timespec* t2, struct timespec* t1, struct timespec* td)
{
td->tv_sec = t2->tv_sec - t1->tv_sec;
td->tv_nsec = t2->tv_nsec - t1->tv_nsec;
if (td->tv_nsec < 0) {
td->tv_sec--;
td->tv_nsec += 1000000000L;
}
}
static time_t
elapsed_time(struct timespec* t2, struct timespec* t1)
{
// Compute the elapsed time between the two timestamps
struct timespec td = { 0 };
timespec_delta(t2, t1, &td);
// We don't need nanosecond precision, just round up if necessary
if (td.tv_nsec >= 500000000L) {
td.tv_sec++;
td.tv_nsec = 0;
}
return td.tv_sec;
}
// Yield for a bit on devices where we can't rely on MXCFB_WAIT_FOR_UPDATE_COMPLETE...
static int
stub_wait_for_update_complete(int fbfd __attribute__((unused)), uint32_t marker __attribute__((unused)))
{
// c.f., https://github.com/koreader/koreader-base/blob/21f4b974c7ab64a149075adc32318f87bf71dcdc/ffi/framebuffer_mxcfb.lua#L230-L235
const struct timespec zzz = { 0L, 250 * 1000000L }; // 250ms
return nanosleep(&zzz, NULL);
}
// Attempt to figure out the current frontlight intensity…
static uint8_t
get_frontlight_intensity(void)
{
// If all else fails, don't touch the FL by ensuring we return 0
uint8_t intensity = 0U;
// On Mk. 7, we can actually get it from sysfs, making our life far easier…
FILE* f = fopen(FL_INTENSITY_SYSFS, "re");
if (f) {
char fl_intensity[8] = { 0 };
size_t size = fread(fl_intensity, sizeof(*fl_intensity), sizeof(fl_intensity) - 1U, f);
fclose(f);
f = NULL;
if (size > 0) {
// Strip trailing LF
if (fl_intensity[size - 1U] == '\n') {
fl_intensity[size - 1U] = '\0';
}
}
if (strtoul_hhu(fl_intensity, &intensity) < 0) {
PFLOG(LOG_WARNING,
"Could not convert sysfs frontlight intensity value `%s` to an uint8_t!",
fl_intensity);
} else {
// We're good, don't bother trying to parse KOReader's settings!
PFLOG(LOG_INFO, "sysfs says frontlight intensity is at %hhu%%", intensity);
return intensity;
}
}
const char* ko_dir = getenv("KOREADER_DIR");
if (!ko_dir) {
PFLOG(LOG_WARNING, "Unable to compute KOReader directory!");
return intensity;
}
// Now, try to parse KOReader's settings…
char ko_settings[PATH_MAX] = { 0 };
snprintf(ko_settings, sizeof(ko_settings) - 1U, "%s/settings.reader.lua", ko_dir);
f = fopen(ko_settings, "re");
if (f) {
bool found_state = false;
bool fl_state = false;
bool found_intensity = false;
uint8_t fl_intensity = 0U;
char* line = NULL;
line = calloc(PIPE_BUF, sizeof(*line));
if (!line) {
PFLOG(LOG_ERR, "calloc: %m");
fclose(f);
return intensity;
}
while (fgets(line, PIPE_BUF, f)) {
char* cur_line = line;
if (strstr(cur_line, "[\"is_frontlight_on\"]")) {
char* setting_key = strsep(&cur_line, "=");
if (!setting_key) {
PFLOG(LOG_WARNING,
"Could not parse 'is_frontline_on' in KOReader's settings (key)");
continue;
}
char* setting_value = strsep(&cur_line, ",");
if (!setting_value) {
PFLOG(LOG_WARNING,
"Could not parse 'is_frontline_on' in KOReader's settings (value)");
continue;
}
setting_value = strtrim(setting_value);
if (strcmp(setting_value, "true") == 0) {
found_state = true;
fl_state = true;
PFLOG(LOG_INFO, "Frontlight is enabled in KOReader");
} else if (strcmp(setting_value, "false") == 0) {
found_state = true;
fl_state = false;
PFLOG(LOG_INFO, "Frontlight is disabled in KOReader");
} else {
PFLOG(LOG_WARNING,
"Could not parse 'is_frontline_on' value! (`%s`)",
setting_value);
}
} else if (strstr(cur_line, "[\"frontlight_intensity\"]")) {
char* setting_key = strsep(&cur_line, "=");
if (!setting_key) {
PFLOG(LOG_WARNING,
"Could not parse 'frontlight_intensity' in KOReader's settings (key)");
continue;
}
char* setting_value = strsep(&cur_line, ",");
if (!setting_value) {
PFLOG(LOG_WARNING,
"Could not parse 'frontlight_intensity' in KOReader's settings (value)");
continue;
}
setting_value = strtrim(setting_value);
if (strtoul_hhu(setting_value, &fl_intensity) < 0) {
PFLOG(LOG_WARNING,
"Could not convert KOReader frontlight intensity value `%s` to an uint8_t!",
setting_value);
} else {
found_intensity = true;
PFLOG(LOG_INFO, "KOReader says frontlight intensity is at %hhu%%", fl_intensity);
}
}
// If we've found & parsed both state & intensity, we're golden
if (found_intensity && found_state) {
// And if it is actually enabled, update the return value
if (fl_state) {
intensity = fl_intensity;
}
break;
}
}
fclose(f);
free(line);
}
return intensity;
}
// Fancy frontlight toggle :)
// Based on a PoC tested in https://github.com/koreader/koreader/pull/5421#discussion_r327812380
static void
toggle_frontlight(bool state, uint8_t intensity, int ntxfd)
{
#define STEPS 20u
#define SLEEP 7u // in ms
// NOTE: The ioctl on newer devices actually blocks for noticeably longer than on older devices,
// c.f., https://github.com/koreader/koreader/blob/b40331085a565f99a95c27012b1aa3e71e3eb182/frontend/device/kobo/powerd.lua#L331-L332
// Here, we get away with this thanks to the larger amount of steps, combined with the fact that on newer devices,
// the ioctl won't block as long if it's called with the same requested intensity as the current intensity.
const struct timespec zzz = { 0L, SLEEP * 1000000L };
if (state == false) {
// Ramp-down
for (uint8_t i = 1U; i <= STEPS; i++) {
int ptr = ifloorf(intensity - ((intensity / (float) STEPS) * i));
int rc = ioctl(ntxfd, CM_FRONT_LIGHT_SET, ptr);
if (rc == -1) {
PFLOG(LOG_WARNING, "Could not set frontlight intensity to %d%% (ioctl: %m)", ptr);
}
if (i < STEPS) {
nanosleep(&zzz, NULL);
}
}
} else {
// Ramp-up
for (uint8_t i = 1U; i <= STEPS; i++) {
int ptr = iceilf(0U + ((intensity / (float) STEPS) * i));
int rc = ioctl(ntxfd, CM_FRONT_LIGHT_SET, ptr);
if (rc == -1) {
PFLOG(LOG_WARNING, "Could not set frontlight intensity to %d%% (ioctl: %m)", ptr);
}
if (i < STEPS) {
nanosleep(&zzz, NULL);
}
}
}
}
// Check if there's an auxiliary battery connected (e.g., the Sage's PowerCover).
static bool
is_aux_battery_connected(void)
{
FILE* f = fopen(CILIX_CONNECTED_SYSFS, "re");
if (f) {
char cilix_conn[8] = { 0 };
size_t size = fread(cilix_conn, sizeof(*cilix_conn), sizeof(cilix_conn) - 1U, f);
fclose(f);
f = NULL;
if (size > 0) {
// Strip trailing LF
if (cilix_conn[size - 1U] == '\n') {
cilix_conn[size - 1U] = '\0';
}
}
// Check if the PowerCover is currently connected
if (cilix_conn[0] == '1') {
return true;
}
}
return false;
}
// We'll want to regularly update a display of the plug/charge status, and whether Wi-Fi is on or not
static void
print_status(const USBMSContext* ctx)
{
// Check if we're plugged in…
bool usb_plugged = (*fxpIsUSBPlugged)(ctx->ntxfd, false);
// Get the battery charge %
uint8_t batt_perc = 0U;
FILE* f = fopen(BATT_CAP_SYSFS, "re");
if (f) {
char batt_charge[8] = { 0 };
size_t size = fread(batt_charge, sizeof(*batt_charge), sizeof(batt_charge) - 1U, f);
fclose(f);
if (size > 0) {
// Strip trailing LF
if (batt_charge[size - 1U] == '\n') {
batt_charge[size - 1U] = '\0';
}
}
if (strtoul_hhu(batt_charge, &batt_perc) < 0) {
PFLOG(LOG_WARNING, "Could not convert battery charge value `%s` to an uint8_t!", batt_charge);
}
}
// Check if there's a PowerCover
bool has_aux_battery = false;
uint8_t aux_batt_perc = 0U;
if (ctx->fbink_state.device_id == DEVICE_KOBO_SAGE) {
has_aux_battery = is_aux_battery_connected();
if (has_aux_battery) {
f = fopen(CILIX_BATT_CAP_SYSFS, "re");
if (f) {
char cilix_charge[8] = { 0 };
size_t size = fread(cilix_charge, sizeof(*cilix_charge), sizeof(cilix_charge) - 1U, f);
fclose(f);
if (size > 0) {
// Strip trailing LF
if (cilix_charge[size - 1U] == '\n') {
cilix_charge[size - 1U] = '\0';
}
}
if (strtoul_hhu(cilix_charge, &aux_batt_perc) < 0) {
PFLOG(LOG_WARNING,
"Could not convert cilix charge value `%s` to an uint8_t!",
cilix_charge);
}
}
}
}
// Check for Wi-Fi status
// (c.f., https://github.com/koreader/koreader/blob/b5d33058761625111d176123121bcc881864a64e/frontend/device/kobo/device.lua#L451-L471)
bool wifi_up = false;
char if_sysfs[PATH_MAX] = { 0 };
snprintf(if_sysfs, sizeof(if_sysfs) - 1U, "/sys/class/net/%s/carrier", getenv("INTERFACE"));
f = fopen(if_sysfs, "re");
if (f) {
char carrier[8] = { 0 };
size_t size = fread(carrier, sizeof(*carrier), sizeof(carrier) - 1U, f);
fclose(f);
if (size > 0) {
// Strip trailing LF
if (carrier[size - 1U] == '\n') {
carrier[size - 1U] = '\0';
}
}
// If there's a carrier, Wi-Fi is up.
if (carrier[0] == '1') {
wifi_up = true;
}
}
// Display the time
time_t t = time(NULL);
struct tm local_tm;
struct tm* lt = localtime_r(&t, &local_tm);
char sz_time[6] = { 0 };
strftime(sz_time, sizeof(sz_time), "%H:%M", lt);
if (has_aux_battery) {
fbink_printf(ctx->fbfd,
&ctx->ot_cfg,
&ctx->fbink_cfg,
NULL,
"%s • \uf017 %s • %s (%hhu%%) + %s (%hhu%%) • %s",
usb_plugged ? "\U000f06a5" : "\U000f06a6",
sz_time,
get_battery_icon(batt_perc),
batt_perc,
get_battery_icon(aux_batt_perc),
aux_batt_perc,
wifi_up ? "\U000f05a9" : "\U000f05aa");
} else {
fbink_printf(ctx->fbfd,
&ctx->ot_cfg,
&ctx->fbink_cfg,
NULL,
"%s • \uf017 %s • %s (%hhu%%) • %s",
usb_plugged ? "\U000f06a5" : "\U000f06a6",
sz_time,
get_battery_icon(batt_perc),
batt_perc,
wifi_up ? "\U000f05a9" : "\U000f05aa");
}
}
static void
print_icon(const char* string, USBMSContext* ctx)
{
ctx->fbink_cfg.is_halfway = true;
fbink_print_ot(ctx->fbfd, string, &ctx->icon_cfg, &ctx->fbink_cfg, NULL);
ctx->fbink_cfg.is_halfway = false;
}
static int
print_msg(const char* string, USBMSContext* ctx)
{
return fbink_print_ot(ctx->fbfd, string, &ctx->msg_cfg, &ctx->fbink_cfg, NULL);
}
static int
print_countdown(time_t left, USBMSContext* ctx)
{
if (ctx->fbink_state.device_id == DEVICE_KOBO_NIA) {
// NOTE: Device is plagued by the random EPDC hangs, but *doesn't* allow poking the EPDC's PM via sysfs,
// so, skip the whole thing to avoid crashing...
return ERRCODE(ENOSYS);
}
const char* icon = NULL;
switch (left % 3) {
case 0:
icon = "\U0000f251";
break;
case 1:
icon = "\U0000f253";
break;
case 2:
icon = "\U0000f252";
break;
default:
icon = "\U0000f254";
break;
}
// NOTE: Because this turns out to be a very good test-case for that kernel issue ;).
// Plus, we're essentially a callback running from a timerfd, which offers us perfectly controlled timing.
// And given that we'll be plugged-in most of the rest of the time,
// this is the only place where we're at a *significant* risk of triggering the hang.
// (I mean, it took me relatively massive efforts to repro the issue on my Clara 2E when I originally looked into it,
// and this made it crash after 42s on the first try...).
fbink_wakeup_epdc();
return fbink_printf(ctx->fbfd, &ctx->countdown_cfg, &ctx->fbink_cfg, NULL, "%s %lld", icon, (long long int) left);
}
static int
clear_countdown(USBMSContext* ctx)
{
return fbink_print_ot(ctx->fbfd, " ", &ctx->countdown_cfg, &ctx->fbink_cfg, NULL);
}
// Poor man's grep in /proc/modules
__attribute((nonnull(1))) static bool
is_module_loaded(const char* needle)
{
FILE* f = fopen("/proc/modules", "re");
if (f) {
char line[PIPE_BUF];
size_t len = strlen(needle);
while (fgets(line, sizeof(line), f)) {
if (strncmp(line, needle, len) == 0) {
fclose(f);
return true;
}
}
fclose(f);
}
return false;
}
// Parse an evdev event, looking for a power button press
static bool
handle_evdev(struct libevdev* dev)
{
int rc = 1;
do {
struct input_event ev;
rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);
if (rc == LIBEVDEV_READ_STATUS_SYNC) {
while (rc == LIBEVDEV_READ_STATUS_SYNC) {
// NOTE: We're ignoring the sync delta events here.
rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_SYNC, &ev);
}
} else if (rc == LIBEVDEV_READ_STATUS_SUCCESS) {
// Check if it's a power button press (well, release, actually)
if (libevdev_event_is_code(&ev, EV_KEY, KEY_POWER) == 1 && ev.value == 0) {
return true;
}
}
} while (rc == LIBEVDEV_READ_STATUS_SYNC || rc == LIBEVDEV_READ_STATUS_SUCCESS);
if (rc != LIBEVDEV_READ_STATUS_SUCCESS && rc != -EAGAIN) {
PFLOG(LOG_ERR, "Failed to handle input events: %s", strerror(-rc));
}
return false;
}
// Parse an evdev event, looking for a SW_DOCK switch
static int
handle_usbc_evdev(struct libevdev* dev)
{
int rc = 1;
do {
struct input_event ev;
rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);
if (rc == LIBEVDEV_READ_STATUS_SYNC) {
while (rc == LIBEVDEV_READ_STATUS_SYNC) {
// NOTE: We're ignoring the sync delta events here.
rc = libevdev_next_event(dev, LIBEVDEV_READ_FLAG_SYNC, &ev);
}
} else if (rc == LIBEVDEV_READ_STATUS_SUCCESS) {
// If it's a SW_DOCK switch, return the value
if (libevdev_event_is_code(&ev, EV_SW, SW_DOCK) == 1) {
LOG(LOG_NOTICE, "Caught a USB-C plug %s event", ev.value ? "in" : "out");
return ev.value;
}
}
} while (rc == LIBEVDEV_READ_STATUS_SYNC || rc == LIBEVDEV_READ_STATUS_SUCCESS);
if (rc != LIBEVDEV_READ_STATUS_SUCCESS && rc != -EAGAIN) {
PFLOG(LOG_ERR, "Failed to handle input events: %s", strerror(-rc));
}
return -1;
}
// Parse an uevent
static int
handle_uevent(struct uevent_listener* l, struct uevent* uevp)
{
ue_reset_event(uevp);
ssize_t len = xread(l->pfd.fd, uevp->buf, sizeof(uevp->buf) - 1U);
if (len == -1) {
if (errno == ENOBUFS) {
// NOTE: Unlike ue_wait_for_event, don't recover:
// since events were most likely lost, we'll consider this fatal
PFLOG(LOG_WARNING, "uevent overrun!");
}
PFLOG(LOG_CRIT, "read: %m");
return ERR_LISTENER_RECV;
}
char* end = uevp->buf + len;
*end = '\0';
int rc = ue_parse_event_msg(uevp, (size_t) len);
if (rc == EXIT_SUCCESS) {
PFLOG(LOG_DEBUG, "uevent successfully parsed");
return EXIT_SUCCESS;
} else if (rc == ERR_PARSE_UDEV) {
PFLOG(LOG_DEBUG, "skipped %zd bytes udev uevent: `%.*s`", len, (int) len, uevp->buf);
} else if (rc == ERR_PARSE_INVALID_HDR) {
PFLOG(LOG_DEBUG, "skipped %zd bytes malformed uevent: `%.*s`", len, (int) len, uevp->buf);
} else {
PFLOG(LOG_DEBUG, "skipped %zd bytes unsupported uevent: `%.*s`", len, (int) len, uevp->buf);
}
return EXIT_FAILURE;
}
int
main(void)
{
// So far, so good ;).
int rv = EXIT_SUCCESS;
int pwd = -1;
char* abs_pwd = NULL;
bool is_CJK = false;
struct uevent_listener listener = { 0 };
listener.pfd.fd = -1;
struct libevdev* dev = NULL;
USBMSContext ctx = { 0 };
int evfd = -1;
int clockfd = -1;
int countdown_fd = -1;
struct libevdev* usbc_dev = NULL;
int usbc_fd = -1;
// Close any non-standard fds before we open any ourselves (this should be a NOP on sane launchers)
bsd_closefrom(3);
// We'll be chatting exclusively over syslog, because duh.
openlog("usbms", LOG_CONS | LOG_PID | LOG_NDELAY, LOG_DAEMON);
// Say hello
LOG(LOG_INFO, "Initializing USBMS %s (%s)", USBMS_VERSION, USBMS_TIMESTAMP);
// Redirect stdin/stdout/stderr to /dev/null
int fd = open("/dev/null", O_RDONLY);
if (fd != -1) {
dup2(fd, fileno(stdin));
close(fd);
} else {
PFLOG(LOG_CRIT, "open(\"/dev/null\", O_RDONLY): %m");
rv = USBMS_EARLY_EXIT;
goto cleanup;
}
fd = open("/dev/null", O_RDWR);
if (fd != -1) {
dup2(fd, fileno(stdout));
dup2(fd, fileno(stderr));
close(fd);
} else {
PFLOG(LOG_CRIT, "open(\"/dev/null\", O_RDWR): %m");
rv = USBMS_EARLY_EXIT;
goto cleanup;
}
// We'll want to jump to /, and only get back to our original PWD on exit…
// c.f., man getcwd for the fchdir trick, as we can certainly spare the fd ;).
// NOTE: While using O_PATH would be nice, the flag itself is Linux 2.6.39+,
// but, more importantly, the resulting fd is only usable with fchdir since Linux 3.5+…
// And, of course, Mk. 6 devices are smack in that sweet spot: they run Linux 3.0.35,
// where O_PATH is supported, but not by fchdir ;).
pwd = open(".", O_RDONLY | O_DIRECTORY | O_CLOEXEC);
if (pwd == -1) {
PFLOG(LOG_CRIT, "open(\".\"): %m");
rv = USBMS_EARLY_EXIT;
goto cleanup;
}
// We do need the pathname to load resources, though…
abs_pwd = get_current_dir_name();
if (chdir("/") == -1) {
PFLOG(LOG_CRIT, "chdir(\"/\"): %m");
rv = USBMS_EARLY_EXIT;
goto cleanup;
}
char resource_path[PATH_MAX] = { 0 };
// Make sure we have a klogd instance redirecting the kernel logs to syslog, so we get some context interleaved with our own logging.
snprintf(resource_path, sizeof(resource_path) - 1U, "%s/scripts/launch-klogd.sh", abs_pwd);
system(resource_path);
// NOTE: The font we ship only covers LGC scripts. Blacklist a few languages where we know it won't work,
// based on KOReader's own language list (c.f., frontend/ui/language.lua).
// Because English is better than the replacement character ;p.
// We do jump through a few hoops to attempt to salvage CJK support…
const char* lang = getenv("LANGUAGE");
if (lang) {
if (strncmp(lang, "he", 2U) == 0 || strncmp(lang, "ar", 2U) == 0 || strncmp(lang, "fa", 2U) == 0) {
LOG(LOG_NOTICE, "Your language (%s) is unsupported (RTL), falling back to English", lang);
setenv("LANGUAGE", "C", 1);
} else if (strncmp(lang, "bn", 2U) == 0 || strncmp(lang, "hi", 2U) == 0) {
LOG(LOG_NOTICE, "Your language (%s) is unsupported (!LGC), falling back to English", lang);
setenv("LANGUAGE", "C", 1);
} else if (strncmp(lang, "ja", 2U) == 0 || strncmp(lang, "ko", 2U) == 0 || strncmp(lang, "zh", 2U) == 0) {
LOG(LOG_NOTICE, "Your language (%s) may be badly handled (CJK)!", lang);
// If we don't actually have a translation ready, don't set the CJK flag, and fallback to English.
snprintf(
resource_path, sizeof(resource_path) - 1U, "%s/l10n/%s/LC_MESSAGES/usbms.mo", abs_pwd, lang);
if (access(resource_path, F_OK) == 0) {
is_CJK = true;