gpio: remove handling of W_DISABLE pin

The PinePhone has circuitry that makes this pin active-high, but the
PinePhone Pro doesn't appear to, which means we would need read active
high / active low from the config file. Since the modem works fine
without setting this pin, remove the logic to handle the W_DISBALE pin.

README.md

@@ -15,7 +15,7 @@ It implements the following features:
 
 `eg25-manager` requires the following development libraries:
 - libglib2.0-dev
-- libgpiod-dev
+- libgpiod-dev (>= 2.0)
 - libmm-glib-dev
 
 ## Building

data/eg25-manager.service.in

@@ -4,7 +4,7 @@ Before=ModemManager.service
 
 [Service]
 Type=simple
-ExecStart=@bindir@/eg25manager
+ExecStart=@bindir@/eg25-manager
 Restart=on-failure
 ProtectControlGroups=true
 ProtectHome=true

data/pine64,pinephone-1.0.toml

@@ -1,4 +1,5 @@
 [manager]
+monitor_udev = true
 need_libusb = true
 usb_vid = 0x2c7c
 usb_pid = 0x0125

data/pine64,pinephone-1.1.toml

@@ -1,4 +1,5 @@
 [manager]
+monitor_udev = true
 need_libusb = true
 usb_vid = 0x2c7c
 usb_pid = 0x0125

data/pine64,pinephone-1.2.toml

@@ -1,4 +1,7 @@
 [manager]
+monitor_udev = true
+usb_vid = 0x2c7c
+usb_pid = 0x0125
 # Delay between setting GPIO and PWRKEY sequence, set in microseconds
 poweron_delay = 100000
 
@@ -60,9 +63,9 @@ configure = [
     { cmd = "QSCLK", value = "1" },
 # GNSS configuration:
 #   * Enable A-GPS data upload support (XTRA)
-#   * Disable On-Demand-Positioning (ODP) mode 
+#   * Disable On-Demand-Positioning (ODP) mode
 #     to avoid running the GNSS system in the background, even when not enabled.
-#   * Enable Dynamic Power Optimizations (DPO) mode to turn off GNSS RF radios 
+#   * Enable Dynamic Power Optimizations (DPO) mode to turn off GNSS RF radios
 #     when they are not in use.
 #   * Only enable GPS and GLONASS, disable other GNSS systems.
 #     A-GPS data upload doesn't work for Galileo anyway.

data/pine64,pinephone-pro.toml

@@ -1,4 +1,7 @@
 [manager]
+monitor_udev = false
+usb_vid = 0x2c7c
+usb_pid = 0x0125
 # Delay between setting GPIO and PWRKEY sequence, set in microseconds
 poweron_delay = 100000
 
@@ -35,7 +38,7 @@ configure = [
 # Print software version
     { cmd = "QGMR" },
 # Configure audio
-    { cmd = "QDAI", expect = "3,0,0,4,0,0,1,1" },
+    { cmd = "QDAI", expect = "3,0,0,4,0,1,1,1" },
 # RI signaling using physical RI pin
     { cmd = "QCFG", subcmd = "risignaltype", expect = "\"physical\"" },
 # Enable VoLTE support
@@ -60,9 +63,9 @@ configure = [
     { cmd = "QSCLK", value = "1" },
 # GNSS configuration:
 #   * Enable A-GPS data upload support (XTRA)
-#   * Disable On-Demand-Positioning (ODP) mode 
+#   * Disable On-Demand-Positioning (ODP) mode
 #     to avoid running the GNSS system in the background, even when not enabled.
-#   * Enable Dynamic Power Optimizations (DPO) mode to turn off GNSS RF radios 
+#   * Enable Dynamic Power Optimizations (DPO) mode to turn off GNSS RF radios
 #     when they are not in use.
 #   * Only enable GPS and GLONASS, disable other GNSS systems.
 #     A-GPS data upload doesn't work for Galileo anyway.

doc/eg25-manager.5.scd

@@ -0,0 +1,106 @@
+eg25-manager(5)
+
+# NAME
+eg25-manager configuration file format
+
+# SYNOPSIS
+eg25-manager uses toml formatted files for configuration.
+
+Configurations are loaded from:
+	- *@eg25_confdir@/<compatible>.toml*: User-provided overrides (optional)
+	- *@eg25_datadir@/<compatible>.toml*: Default configuration (required)
+
+# SECTION: manager
+General settings for eg25-manager.
+
+*poweron_delay* int (microseconds)
+	Delay between de-asserting RESET and starting the PWRKEY sequence.
+
+# SECTION: suspend
+Settings for how to handle suspend on the system where eg25-manager is running.
+
+*boot_timeout* int (seconds)
+	Prevent the system from suspending for boot_timeout seconds to allow the
+	modem to fully boot.
+
+	Default: 120 if unset or zero.
+
+*recovery_timeout* int (seconds)
+	Amount of time to wait for the modem to reappear after suspend. If the
+	timeout is reached the modem's USB connection will be reset.
+
+	Default: 9 if unset or zero.
+
+# SECTION: at
+AT commands to send when different events happen, and where to send them to.
+
+Each command has 4 possible elements:
+	- *cmd*: the AT command itself, which will be translated to "AT+`cmd`"
+	- *subcmd*: the subcommand in case a single AT command can be used to
+	  change multiple parameters, such as QCFG
+	- *value*: the command's argument(s), usually used to set the value of a
+	  specific parameter
+	- *expect*: the expected return value; the command is first executed
+	  without any value in order to query the current state. This state is
+	  then compared to the *expect* string; if they don't match, the command
+	  is then executed with value *expect* in order to set the parameter to
+	  the expected value
+A command can have *expect* OR *value* configured, but it shouldn't have both
+
+*NOTE:* If a command sequence is configured in an override file, the default
+commands won't be loaded from the system configuration. The default commands
+should be copied into the override file when changing them.
+
+*uart* string
+	The serial port to use for sending AT commands to the modem.
+
+*configure* List of commands
+	AT commands to send to the modem when it is first started.
+
+*suspend* List of commands
+	AT commands to send to the modem before the system suspends.
+
+*resume* List of commands
+	AT commands to send to the modem after the system resumes from suspend.
+
+*reset* List of commands
+	AT commands to send to the modem if resetting the usb port fails.
+
+# SECTION: gnss
+Settings for uploading AGPS assistance data to the modem.
+
+*enabled* boolean
+	Enable or disable uploading AGPS data to the modem
+
+*url* string
+	The directory on the server that contains the assistance files
+
+	Example: https://xtrapath4.izatcloud.net
+
+*file* string
+	The name of the assistance file on the server.
+
+	Example: xtra2.bin
+
+# SECTION: gpio
+The *gpio* section defines the GPIO pins to use for different modem functions.
+These settings should only be changed when porting eg25-manager to a new device;
+for this reason they aren't documented here.
+
+# EXAMPLES
+Print the firmware version every time the phone wakes from suspend:
+```
+[at]
+resume = [
+    { cmd = "QGMR" },
+]
+```
+
+Disable uploading AGPS data to the modem:
+```
+[gnss]
+enabled = false
+```
+
+# SEE AlSO
+*eg25-manager*(8)

doc/eg25-manager.8.scd

@@ -0,0 +1,37 @@
+eg25-manager(8)
+
+# NAME
+eg25-manager - a daemon for managing the Quectel EG25 modem found on the
+Pine64 PinePhone.
+
+# SYNOPSIS
+*eg25-manager* [-v] [-c config_file]
+
+# OPTIONS
+*-v*
+	Show the version number and quit.
+*-c*
+	User configuration file, defaults to the device configuration file in
+	/etc/eg25-manager.
+
+# FILES
+Configurations are loaded from:
+	- *@eg25_confdir@/<compatible>.toml*: User-provided overrides (optional)
+	- *@eg25_datadir@/<compatible>.toml*: Default configuration (required)
+
+eg25-manager will search these folders for files named after the value of the
+compatible device-tree property (with the .toml file extension) and use the
+first matching file in each directory. If no matching default configuration is
+found, eg25-manager will exit with an error message.
+
+Values from the user-provided overrides will take priority over values stored in
+the default configuration. Only changed values must be stored as user overrides,
+so eg25-manager can fall back to the default configuration as often as possible.
+
+The file names eg25-manager will check can be listed using:
+```
+xargs -0 printf '%s.toml\\n' < /proc/device-tree/compatible
+```
+
+# SEE ALSO
+*eg25-manager*(5) *ModemManager*(8) *ofono*(8)

doc/meson.build

@@ -0,0 +1,33 @@
+#
+# Copyright (C) 2020 Arnaud Ferraris <arnaud.ferraris@gmail.com>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+
+scdoc = dependency('scdoc', native: true, required: false)
+if scdoc.found()
+  scdoc_prog = find_program(scdoc.get_variable('scdoc'), native: true)
+
+  foreach section: [5, 8]
+    name = 'eg25-manager'
+    out = '@0@.@1@'.format(name, section)
+
+    preprocessed = configure_file(
+      input: '@0@.scd'.format(out),
+      output: '@BASENAME@.preprocessed',
+      configuration: {
+        'eg25_confdir': eg25_confdir,
+        'eg25_datadir': eg25_datadir,
+        }
+      )
+
+    custom_target(
+      out,
+      output: out,
+      input: preprocessed,
+      command: ['sh', '-c', '@0@ < @INPUT@'.format(scdoc_prog.full_path())],
+      capture: true,
+      install: true,
+      install_dir: join_paths(get_option('mandir'), 'man@0@'.format(section)))
+  endforeach
+endif

meson.build

@@ -8,9 +8,9 @@
 project (
   'eg25-manager',
   'c',
-  version : '0.4.2',
+  version : '0.5.1',
   license : 'GPLv3+',
-  meson_version : '>= 0.50.0',
+  meson_version : '>= 0.58.0',
   default_options :
     [
       'warning_level=1',
@@ -59,12 +59,13 @@ mgr_deps = [
     dependency('glib-2.0'),
     dependency('gio-unix-2.0'),
     dependency('gudev-1.0'),
-    dependency('libgpiod'),
+    dependency('libgpiod', version: '>= 2.0'),
     dependency('libusb-1.0'),
     dependency('libcurl'),
     mmglib_dep,
 ]
 
 subdir('data')
+subdir('doc')
 subdir('src')
 subdir('udev')

src/at.c

@@ -73,10 +73,10 @@ gboolean at_send_command(struct EG25Manager *manager)
     int ret, len = 0, pos = 0;
 
     if (at_cmd) {
-    	/* Wake up the modem from soft sleep before sending an AT command */
-    	gpio_sequence_wake(manager);
+        /* Wake up the modem from soft sleep before sending an AT command */
+        gpio_sequence_wake(manager);
 
-	/* Send AT command */
+        /* Send AT command */
         if (at_cmd->subcmd == NULL && at_cmd->value == NULL && at_cmd->expected == NULL)
             len = snprintf(command, sizeof(command), "AT+%s\r\n", at_cmd->cmd);
         else if (at_cmd->subcmd == NULL && at_cmd->value == NULL)
@@ -126,8 +126,8 @@ gboolean at_send_command(struct EG25Manager *manager)
 
         g_message("Successfully sent command: %s", g_strstrip(command));
     } else {
-    	/* Allow the modem to enter soft sleep again when we sent the AT command*/
-    	gpio_sequence_sleep(manager);
+        /* Allow the modem to enter soft sleep again when we sent the AT command*/
+        gpio_sequence_sleep(manager);
 
         if (manager->modem_state < EG25_STATE_CONFIGURED) {
             if (manager->modem_iface == MODEM_IFACE_MODEMMANAGER) {
@@ -146,8 +146,6 @@ gboolean at_send_command(struct EG25Manager *manager)
             }
         } else if (manager->modem_state == EG25_STATE_SUSPENDING) {
             modem_suspend_post(manager);
-        } else if (manager->modem_state == EG25_STATE_RESETTING) {
-            manager->modem_state = EG25_STATE_POWERED;
         }
     }
 

src/gnss.c

@@ -327,7 +327,7 @@ static void init_assistance_data_upload(struct EG25Manager *manager)
 static void upload_assistance_data(struct EG25Manager *manager)
 {
     gint error;
-    glong written_total = 0;
+    off_t written_total = 0;
     gint ret;
     struct stat sb;
 

src/gpio.c

@@ -8,6 +8,8 @@
 #include "gpio.h"
 
 #include <unistd.h>
+#include <dirent.h>
+#include <sys/stat.h>
 
 /* Those defines are used for legacy config files only */
 #define GPIO_CHIP1_LABEL "1c20800.pinctrl"
@@ -40,21 +42,77 @@ static char *gpio_in_names[] = {
     "status",
 };
 
+enum gpiod_line_value gpio_line_get_value(struct EG25Manager *manager, int line) {
+    enum gpiod_line_value value;
+    unsigned int offset;
+
+    gpiod_line_request_get_requested_offsets(manager->gpio_in[line], &offset, 1);
+    value = gpiod_line_request_get_value(manager->gpio_in[line], offset);
+
+    if (value == GPIOD_LINE_VALUE_ERROR) {
+            g_warning("gpio: couldn't get value on line %d", line);
+    }
+
+    return value;
+}
+
+int gpio_line_set_value(struct EG25Manager *manager, int line, enum gpiod_line_value value) {
+    unsigned int offset;
+    int ret;
+
+    gpiod_line_request_get_requested_offsets(manager->gpio_out[line], &offset, 1);
+    ret = gpiod_line_request_set_value(manager->gpio_out[line], offset, value);
+    if (ret) {
+        g_warning("gpio: couldn't set value %d on line %d", value, line);
+        return -1;
+    }
+    else {
+        manager->gpio_out_value[line] = value;
+        return 0;
+    }
+}
+
 int gpio_sequence_poweron(struct EG25Manager *manager)
 {
-    gpiod_line_set_value(manager->gpio_out[GPIO_OUT_PWRKEY], 1);
-    sleep(1);
-    gpiod_line_set_value(manager->gpio_out[GPIO_OUT_PWRKEY], 0);
+    /*
+     * Force the modem to poweroff using the RESET_N pin before attempting to
+     * boot in case the it got into a bad state.
+     *
+     * If the modem was on, this will cause it to start booting, so press the
+     * power button while in reset to avoid a (probably only theoretical) race
+     * condition where it starts booting after reset, and then powers off from
+     * the power key.
+     */
+    gpio_line_set_value(manager, GPIO_OUT_RESET, GPIOD_LINE_VALUE_ACTIVE);
+    gpio_line_set_value(manager, GPIO_OUT_PWRKEY, GPIOD_LINE_VALUE_ACTIVE);
 
-    g_message("Executed power-on/off sequence");
+    /*
+     * The datasheet says to pull the pin low for between 150 and 460 ms. usleep
+     * should always sleep for at least the specified amount of time, so use
+     * 200ms because it's closer to the bottom of that range.
+     */
+    usleep(200000);
+
+    gpio_line_set_value(manager, GPIO_OUT_RESET, GPIOD_LINE_VALUE_INACTIVE);
+
+    /*
+     * The modem has finished it's reset, now we wait to allow it a chance to
+     * react to the power key
+     */
+    sleep(1);
+
+    gpio_line_set_value(manager, GPIO_OUT_PWRKEY, GPIOD_LINE_VALUE_INACTIVE);
+
+    g_message("Executed power-on sequence");
 
     return 0;
 }
 
 int gpio_sequence_shutdown(struct EG25Manager *manager)
 {
-    gpiod_line_set_value(manager->gpio_out[GPIO_OUT_DISABLE], 1);
-    gpio_sequence_poweron(manager);
+    gpio_line_set_value(manager, GPIO_OUT_PWRKEY, GPIOD_LINE_VALUE_ACTIVE);
+    sleep(1);
+    gpio_line_set_value(manager, GPIO_OUT_PWRKEY, GPIOD_LINE_VALUE_INACTIVE);
 
     g_message("Executed power-off sequence");
 
@@ -63,7 +121,7 @@ int gpio_sequence_shutdown(struct EG25Manager *manager)
 
 int gpio_sequence_suspend(struct EG25Manager *manager)
 {
-    gpiod_line_set_value(manager->gpio_out[GPIO_OUT_APREADY], 1);
+    gpio_line_set_value(manager, GPIO_OUT_APREADY, GPIOD_LINE_VALUE_ACTIVE);
 
     g_message("Executed suspend sequence");
 
@@ -72,7 +130,7 @@ int gpio_sequence_suspend(struct EG25Manager *manager)
 
 int gpio_sequence_resume(struct EG25Manager *manager)
 {
-    gpiod_line_set_value(manager->gpio_out[GPIO_OUT_APREADY], 0);
+    gpio_line_set_value(manager, GPIO_OUT_APREADY, GPIOD_LINE_VALUE_INACTIVE);
 
     g_message("Executed resume sequence");
 
@@ -81,8 +139,8 @@ int gpio_sequence_resume(struct EG25Manager *manager)
 
 int gpio_sequence_wake(struct EG25Manager *manager)
 {
-    if (gpiod_line_get_value(manager->gpio_out[GPIO_OUT_DTR])) {
-        gpiod_line_set_value(manager->gpio_out[GPIO_OUT_DTR], 0);
+    if (manager->gpio_out_value[GPIO_OUT_DTR]) {
+        gpio_line_set_value(manager, GPIO_OUT_DTR, GPIOD_LINE_VALUE_INACTIVE);
 
         /* Give the modem 200ms to wake from soft sleep */
         usleep(200000);
@@ -95,42 +153,150 @@ int gpio_sequence_wake(struct EG25Manager *manager)
 
 int gpio_sequence_sleep(struct EG25Manager *manager)
 {
-    gpiod_line_set_value(manager->gpio_out[GPIO_OUT_DTR], 1);
+    gpio_line_set_value(manager, GPIO_OUT_DTR, GPIOD_LINE_VALUE_ACTIVE);
     g_message("Executed soft sleep sequence");
 
     return 0;
 }
 
-struct gpiod_line *gpio_get_output_line(struct EG25Manager *manager, int chip, int line)
-{
-    struct gpiod_line *gpio_line;
+struct gpiod_line_request *gpio_request_line(struct EG25Manager *manager, int chip, unsigned int line, enum gpiod_line_direction direction) {
+    struct gpiod_line_request *request = NULL;
+    struct gpiod_line_settings *settings;
+    struct gpiod_line_config *line_cfg;
+    struct gpiod_request_config *req_cfg;
+    int ret;
 
-    gpio_line = gpiod_chip_get_line(manager->gpiochip[chip], line);
-    if (!gpio_line)
+    settings = gpiod_line_settings_new();
+    if (!settings)
         return NULL;
 
-    if (gpiod_line_request_output(gpio_line, "eg25manager", 0) < 0) {
-        gpiod_line_release(gpio_line);
-        return NULL;
-    }
+    gpiod_line_settings_set_direction(settings, direction);
 
-    return gpio_line;
+    line_cfg = gpiod_line_config_new();
+    if (!line_cfg)
+        goto free_settings;
+
+    ret = gpiod_line_config_add_line_settings(line_cfg, &line, 1, settings);
+    if (ret)
+        goto free_line_config;
+
+    req_cfg = gpiod_request_config_new();
+    if (!req_cfg)
+        goto free_line_config;
+
+    gpiod_request_config_set_consumer(req_cfg, "eg25-manager");
+
+    request = gpiod_chip_request_lines(manager->gpiochip[chip], req_cfg, line_cfg);
+
+    gpiod_request_config_free(req_cfg);
+
+free_line_config:
+    gpiod_line_config_free(line_cfg);
+
+free_settings:
+    gpiod_line_settings_free(settings);
+
+    return request;
 }
 
-struct gpiod_line *gpio_get_input_line(struct EG25Manager *manager, int chip, int line)
+static int gpio_chip_dir_filter(const struct dirent *entry)
 {
-    struct gpiod_line *gpio_line;
+    struct stat sb;
+    int ret = 0;
+    char *path;
 
-    gpio_line = gpiod_chip_get_line(manager->gpiochip[chip], line);
-    if (!gpio_line)
-        return NULL;
+    if (asprintf(&path, "/dev/%s", entry->d_name) < 0)
+        return 0;
 
-    if (gpiod_line_request_input(gpio_line, "eg25manager") < 0) {
-        gpiod_line_release(gpio_line);
-        return NULL;
+    if ((lstat(path, &sb) == 0) && (!S_ISLNK(sb.st_mode)) &&
+        gpiod_is_gpiochip_device(path))
+        ret = 1;
+
+    free(path);
+
+    return ret;
+}
+
+int gpio_all_chip_paths(char ***paths_ptr)
+{
+    int i, j, num_chips, ret = 0;
+    struct dirent **entries;
+    char **paths;
+
+    num_chips = scandir("/dev/", &entries, gpio_chip_dir_filter, alphasort);
+    if (num_chips < 0)
+        g_error("gpio: unable to scan /dev: %s", g_strerror(errno));
+
+    paths = calloc(num_chips, sizeof(*paths));
+    if (paths == NULL)
+        g_error("gpio: out of memory");
+
+    for (i = 0; i < num_chips; i++) {
+        if (asprintf(&paths[i], "/dev/%s", entries[i]->d_name) < 0) {
+            for (j = 0; j < i; j++)
+                free(paths[j]);
+
+            free(paths);
+            return 0;
+        }
     }
 
-    return gpio_line;
+    *paths_ptr = paths;
+    ret = num_chips;
+
+    for (i = 0; i < num_chips; i++)
+        free(entries[i]);
+
+    free(entries);
+    return ret;
+}
+
+struct gpiod_chip *gpio_chip_open_by_label(const char *label)
+{
+    int num_chips, i;
+    char **paths;
+    const char *clabel;
+    struct gpiod_chip *chip;
+    struct gpiod_chip_info *cinfo;
+
+    num_chips = gpio_all_chip_paths(&paths);
+
+    for (i = 0; i < num_chips; i++) {
+        chip = gpiod_chip_open(paths[i]);
+        if (!chip)
+            continue;
+
+        cinfo = gpiod_chip_get_info(chip);
+        if (!cinfo)
+            goto clean_chip_open;
+
+        clabel = gpiod_chip_info_get_label(cinfo);
+
+        if (strcmp(label, clabel) == 0) {
+            return chip;
+        }
+
+clean_chip_open:
+        gpiod_chip_close(chip);
+    }
+
+    return NULL;
+}
+
+unsigned int gpio_chip_num_lines(struct EG25Manager *manager, unsigned int chip_num) {
+    struct gpiod_chip *chip = manager->gpiochip[chip_num];
+    struct gpiod_chip_info *info;
+    unsigned int num_lines;
+
+    info = gpiod_chip_get_info(chip);
+    if (!info)
+        g_error("gpio: failed to read info: %s", strerror(errno));
+
+    num_lines = gpiod_chip_info_get_num_lines(info);
+
+    gpiod_chip_info_free(info);
+
+    return num_lines;
 }
 
 int gpio_init(struct EG25Manager *manager, toml_table_t *config[])
@@ -144,7 +310,7 @@ int gpio_init(struct EG25Manager *manager, toml_table_t *config[])
     if (!gpio_config[EG25_CONFIG_SYS])
         g_error("Default config file lacks the 'gpio' section!");
 
-    /* 
+    /*
      * The system config could have the `chips` key, but the user one
      * could still use the old format! In order to avoid problems, we
      * should use the new format only if:
@@ -169,7 +335,7 @@ int gpio_init(struct EG25Manager *manager, toml_table_t *config[])
             toml_datum_t data = toml_string_at(chipslist, i);
             if (!data.ok)
                 continue;
-            manager->gpiochip[i] = gpiod_chip_open_by_label(data.u.s);
+            manager->gpiochip[i] = gpio_chip_open_by_label(data.u.s);
             if (!manager->gpiochip[i])
                 g_error("Unable to find GPIO chip '%s'", data.u.s);
         }
@@ -185,10 +351,10 @@ int gpio_init(struct EG25Manager *manager, toml_table_t *config[])
                 g_error("Wrong chip ID for output GPIO '%s'", gpio_out_names[i]);
 
             line = toml_int_in(table, "line");
-            if (!line.ok || line.u.i < 0 || line.u.i > gpiod_chip_num_lines(manager->gpiochip[chip.u.i]))
+            if (!line.ok || line.u.i < 0 || line.u.i > gpio_chip_num_lines(manager, chip.u.i))
                 g_error("Wrong line ID for output GPIO '%s'", gpio_out_names[i]);
 
-            manager->gpio_out[i] = gpio_get_output_line(manager, chip.u.i, line.u.i);
+            manager->gpio_out[i] = gpio_request_line(manager, chip.u.i, line.u.i, GPIOD_LINE_DIRECTION_OUTPUT);
             if (!manager->gpio_out[i])
                 g_error("Unable to get output GPIO %d", i);
         }
@@ -196,18 +362,23 @@ int gpio_init(struct EG25Manager *manager, toml_table_t *config[])
         for (i = 0; i < GPIO_IN_COUNT; i++) {
             toml_table_t *table;
             toml_datum_t chip, line;
-            if (!config_get_table(gpio_config, gpio_in_names[i], &table))
+
+            if (!config_get_table(gpio_config, gpio_in_names[i], &table)) {
+                // BH edition don't have the STATUS line connected, ignore it
+                if (manager->use_libusb && g_strcmp0(gpio_in_names[i], "status") == 0)
+                    continue;
                 g_error("Unable to get config for input GPIO '%s'", gpio_in_names[i]);
+            }
 
             chip = toml_int_in(table, "chip");
             if (!chip.ok || chip.u.i < 0 || chip.u.i > 2)
                 g_error("Wrong chip ID for input GPIO '%s'", gpio_in_names[i]);
 
             line = toml_int_in(table, "line");
-            if (!line.ok || line.u.i < 0 || line.u.i > gpiod_chip_num_lines(manager->gpiochip[chip.u.i]))
+            if (!line.ok || line.u.i < 0 || line.u.i > gpio_chip_num_lines(manager, chip.u.i))
                 g_error("Wrong line ID for input GPIO '%s'", gpio_in_names[i]);
 
-            manager->gpio_in[i] = gpio_get_input_line(manager, chip.u.i, line.u.i);
+            manager->gpio_in[i] = gpio_request_line(manager, chip.u.i, line.u.i, GPIOD_LINE_DIRECTION_INPUT);
             if (!manager->gpio_in[i])
                 g_error("Unable to get input GPIO %d", i);
         }
@@ -215,11 +386,11 @@ int gpio_init(struct EG25Manager *manager, toml_table_t *config[])
         guint offset, chipidx, gpio_idx;
 
         /* Legacy config file, only used on the OG PinePhone */
-        manager->gpiochip[0] = gpiod_chip_open_by_label(GPIO_CHIP1_LABEL);
+        manager->gpiochip[0] = gpio_chip_open_by_label(GPIO_CHIP1_LABEL);
         if (!manager->gpiochip[0])
             g_error("Unable to open GPIO chip " GPIO_CHIP1_LABEL);
 
-        manager->gpiochip[1] = gpiod_chip_open_by_label(GPIO_CHIP2_LABEL);
+        manager->gpiochip[1] = gpio_chip_open_by_label(GPIO_CHIP2_LABEL);
         if (!manager->gpiochip[1])
             g_error("Unable to open GPIO chip " GPIO_CHIP2_LABEL);
 
@@ -235,7 +406,7 @@ int gpio_init(struct EG25Manager *manager, toml_table_t *config[])
                 chipidx = 1;
             }
 
-            manager->gpio_out[i] = gpio_get_input_line(manager, chipidx, offset);
+            manager->gpio_out[i] = gpio_request_line(manager, chipidx, offset, GPIOD_LINE_DIRECTION_OUTPUT);
             if (!manager->gpio_out[i])
                 g_error("Unable to get output GPIO %d", i);
         }
@@ -252,7 +423,7 @@ int gpio_init(struct EG25Manager *manager, toml_table_t *config[])
                 chipidx = 1;
             }
 
-            manager->gpio_in[i] = gpio_get_input_line(manager, chipidx, offset);
+            manager->gpio_in[i] = gpio_request_line(manager, chipidx, offset, GPIOD_LINE_DIRECTION_INPUT);
             if (!manager->gpio_in[i])
                 g_error("Unable to get input GPIO %d", i);
         }
@@ -261,16 +432,18 @@ int gpio_init(struct EG25Manager *manager, toml_table_t *config[])
     return 0;
 }
 
-gboolean gpio_check_poweroff(struct EG25Manager *manager, gboolean keep_down)
+void gpio_force_off(struct EG25Manager *manager)
+{
+    if (manager->gpio_out[GPIO_OUT_RESET]) {
+        g_message("Setting the reset pin to ensure the modem stays off");
+        gpio_line_set_value(manager, GPIO_OUT_RESET, GPIOD_LINE_VALUE_ACTIVE);
+    }
+}
+
+gboolean gpio_check_poweroff(struct EG25Manager *manager)
 {
     if (manager->gpio_in[GPIO_IN_STATUS] &&
-        gpiod_line_get_value(manager->gpio_in[GPIO_IN_STATUS]) == 1) {
-
-        if (keep_down && manager->gpio_out[GPIO_OUT_RESET]) {
-            // Asserting RESET line to prevent modem from rebooting
-            gpiod_line_set_value(manager->gpio_out[GPIO_OUT_RESET], 1);
-        }
-
+        gpio_line_get_value(manager, GPIO_IN_STATUS) == GPIOD_LINE_VALUE_ACTIVE) {
         return TRUE;
     }
 
@@ -283,12 +456,12 @@ void gpio_destroy(struct EG25Manager *manager)
 
     for (i = 0; i < GPIO_OUT_COUNT; i++) {
         if (manager->gpio_out[i])
-            gpiod_line_release(manager->gpio_out[i]);
+            gpiod_line_request_release(manager->gpio_out[i]);
     }
 
     for (i = 0; i < GPIO_IN_COUNT; i++) {
         if (manager->gpio_in[i])
-            gpiod_line_release(manager->gpio_in[i]);
+            gpiod_line_request_release(manager->gpio_in[i]);
     }
 
     if (manager->gpiochip[0])

src/gpio.h

@@ -18,4 +18,5 @@ int gpio_sequence_resume(struct EG25Manager *state);
 int gpio_sequence_wake(struct EG25Manager *state);
 int gpio_sequence_sleep(struct EG25Manager *state);
 
-gboolean gpio_check_poweroff(struct EG25Manager *manager, gboolean keep_down);
+void gpio_force_off(struct EG25Manager *manager);
+gboolean gpio_check_poweroff(struct EG25Manager *manager);

src/manager.c

@@ -38,6 +38,9 @@
 #define EG25_VERSION "0.0.0"
 #endif
 
+#define EG25_DEFAULT_VENDOR_ID  0x2c7c
+#define EG25_DEFAULT_PRODUCT_ID 0x0125
+
 #define POWERON_DELAY_US 100000UL
 
 static gboolean quit_app(struct EG25Manager *manager)
@@ -59,13 +62,17 @@ static gboolean quit_app(struct EG25Manager *manager)
         gpio_sequence_shutdown(manager);
         manager->modem_state = EG25_STATE_FINISHING;
         for (i = 0; i < 30; i++) {
-            if (gpio_check_poweroff(manager, TRUE))
+            if (gpio_check_poweroff(manager)) {
+                g_message("Modem successfully powered down");
                 break;
+            }
             sleep(1);
         }
     }
-    g_message("Modem down, quitting...");
 
+    gpio_force_off(manager);
+
+    g_message("Modem down, quitting...");
     g_main_loop_quit(manager->loop);
 
     return FALSE;
@@ -95,7 +102,7 @@ static gboolean modem_start(struct EG25Manager *manager)
 
         libusb_free_device_list(devices, 1);
         libusb_exit(ctx);
-    } else if (!gpio_check_poweroff(manager, FALSE)) {
+    } else if (!gpio_check_poweroff(manager)) {
         g_message("STATUS is low, modem already powered");
         should_boot = FALSE;
     }
@@ -138,10 +145,38 @@ void modem_configure(struct EG25Manager *manager)
     at_sequence_configure(manager);
 }
 
-static gboolean modem_reset_done(struct EG25Manager* manager)
+static gboolean modem_gpio_reset_done(struct EG25Manager *manager)
+{
+    gpio_sequence_poweron(manager);
+    manager->modem_state = EG25_STATE_POWERED;
+    manager->complete_reset_timer = 0;
+
+    return G_SOURCE_REMOVE;
+}
+
+static gboolean modem_at_reset_done(struct EG25Manager* manager)
+{
+    /*
+     * If the modem was successfully rebooted, then we should have received
+     * "RDY" by now which will transition the state to started.
+     */
+    if (manager->modem_state != EG25_STATE_RESETTING) {
+        manager->complete_reset_timer = 0;
+        return G_SOURCE_REMOVE;
+    }
+
+    g_message("AT reset failed, falling back to GPIO reset");
+
+    gpio_sequence_shutdown(manager);
+    manager->complete_reset_timer = g_timeout_add_seconds(30, G_SOURCE_FUNC(modem_gpio_reset_done), manager);
+
+    return G_SOURCE_REMOVE;
+}
+
+static gboolean modem_rebind_done(struct EG25Manager* manager)
 {
     manager->modem_state = EG25_STATE_RESUMING;
-    manager->reset_timer = 0;
+    manager->complete_reset_timer = 0;
     return FALSE;
 }
 
@@ -149,7 +184,18 @@ gboolean modem_reset(struct EG25Manager *manager)
 {
     int fd, ret, len;
 
-    if (manager->reset_timer) {
+    /* reset sequence started, cannot be canceled anymore */
+    if (manager->schedule_reset_timer) {
+        g_source_remove(manager->schedule_reset_timer);
+        manager->schedule_reset_timer = 0;
+    }
+
+    if (manager->modem_recovery_timer) {
+        g_source_remove(manager->modem_recovery_timer);
+        manager->modem_recovery_timer = 0;
+    }
+
+    if (manager->complete_reset_timer) {
         g_message("modem_reset: timer already setup, skipping...");
         return G_SOURCE_REMOVE;
     }
@@ -164,11 +210,6 @@ gboolean modem_reset(struct EG25Manager *manager)
         return G_SOURCE_REMOVE;
     }
 
-    if (manager->modem_recovery_timer) {
-        g_source_remove(manager->modem_recovery_timer);
-        manager->modem_recovery_timer = 0;
-    }
-
     if (!manager->modem_usb_id) {
         g_warning("Empty modem USB ID");
         goto error;
@@ -185,24 +226,26 @@ gboolean modem_reset(struct EG25Manager *manager)
         g_warning("Unable to open /sys/bus/usb/drivers/usb/unbind");
         goto error;
     }
+
     ret = write(fd, manager->modem_usb_id, len);
+    close(fd);
     if (ret < len) {
         g_warning("Couldn't unbind modem: wrote %d/%d bytes", ret, len);
         goto error;
     }
-    close(fd);
 
     fd = open("/sys/bus/usb/drivers/usb/bind", O_WRONLY);
     if (fd < 0) {
-        g_warning("Unable to open /sys/bus/usb/drivers/usb/unbind");
+        g_warning("Unable to open /sys/bus/usb/drivers/usb/bind");
         goto error;
     }
+
     ret = write(fd, manager->modem_usb_id, len);
+    close(fd);
     if (ret < len) {
         g_warning("Couldn't bind modem: wrote %d/%d bytes", ret, len);
         goto error;
     }
-    close(fd);
 
     g_message("Successfully reset modem's USB connection");
 
@@ -210,7 +253,7 @@ gboolean modem_reset(struct EG25Manager *manager)
      * 3s is long enough to make sure the modem has been bound back and
      * short enough to ensure it hasn't been acquired by ModemManager
      */
-    manager->reset_timer = g_timeout_add_seconds(3, G_SOURCE_FUNC(modem_reset_done), manager);
+    manager->complete_reset_timer = g_timeout_add_seconds(3, G_SOURCE_FUNC(modem_rebind_done), manager);
 
     return G_SOURCE_REMOVE;
 
@@ -228,7 +271,7 @@ error:
     at_sequence_reset(manager);
 
     // Setup timer for making sure we don't queue other reset commands
-    manager->reset_timer = g_timeout_add_seconds(30, G_SOURCE_FUNC(modem_reset_done), manager);
+    manager->complete_reset_timer = g_timeout_add_seconds(45, G_SOURCE_FUNC(modem_at_reset_done), manager);
 
     return G_SOURCE_REMOVE;
 }
@@ -314,6 +357,7 @@ int main(int argc, char *argv[])
     struct EG25Manager manager;
     gchar *config_file = NULL;
     gboolean show_version = FALSE;
+    gboolean monitor_udev = TRUE;
     toml_table_t *toml_config[EG25_CONFIG_COUNT];
     toml_table_t *manager_config[EG25_CONFIG_COUNT];
     const GOptionEntry options[] = {
@@ -363,10 +407,13 @@ int main(int argc, char *argv[])
     if (!manager_config[EG25_CONFIG_SYS])
         g_error("Default config file lacks the 'manager' section!");
 
+    config_get_bool(manager_config, "monitor_udev", &monitor_udev);
     config_get_bool(manager_config, "need_libusb", &manager.use_libusb);
-    config_get_uint(manager_config, "usb_vid", &manager.usb_vid);
-    config_get_uint(manager_config, "usb_pid", &manager.usb_pid);
     config_get_uint(manager_config, "poweron_delay", &manager.poweron_delay);
+    if (!config_get_uint(manager_config, "usb_vid", &manager.usb_vid))
+        manager.usb_vid = EG25_DEFAULT_VENDOR_ID;
+    if (!config_get_uint(manager_config, "usb_pid", &manager.usb_pid))
+        manager.usb_pid = EG25_DEFAULT_PRODUCT_ID;
 
     at_init(&manager, toml_config);
     gpio_init(&manager, toml_config);
@@ -375,7 +422,8 @@ int main(int argc, char *argv[])
 #endif
     ofono_iface_init(&manager, toml_config);
     suspend_init(&manager, toml_config);
-    udev_init(&manager, toml_config);
+    if (monitor_udev)
+        udev_init(&manager, toml_config);
     gnss_init(&manager, toml_config);
 
     for (int i = 0; i < EG25_CONFIG_COUNT; i++) {

src/manager.h

@@ -53,6 +53,7 @@ enum EG25State {
     EG25_STATE_SUSPENDING, // System is going into suspend
     EG25_STATE_RESUMING, // System is being resumed, waiting for modem to come back
     EG25_STATE_RESETTING, // Something went wrong, we're restarting the modem
+    EG25_STATE_UPDATING, // Modem is present but being updated
     EG25_STATE_FINISHING
 };
 
@@ -70,7 +71,8 @@ enum EG25Config {
 
 struct EG25Manager {
     GMainLoop *loop;
-    guint reset_timer;
+    guint complete_reset_timer;
+    guint schedule_reset_timer;
     gboolean use_libusb;
     guint usb_vid;
     guint usb_pid;
@@ -114,8 +116,9 @@ struct EG25Manager {
     GUdevClient *udev;
 
     struct gpiod_chip *gpiochip[2];
-    struct gpiod_line *gpio_out[5];
-    struct gpiod_line *gpio_in[2];
+    struct gpiod_line_request *gpio_out[5];
+    guint gpio_out_value[5];
+    struct gpiod_line_request *gpio_in[2];
 };
 
 void modem_configure(struct EG25Manager *data);

src/meson.build

@@ -25,7 +25,7 @@ if mmglib_dep.found()
 endif
 
 executable (
-    'eg25manager',
+    'eg25-manager',
     src,
     dependencies : mgr_deps,
     link_with: gdbofono_lib,

src/suspend.c

@@ -18,10 +18,24 @@
 #define SD_PATH         "/org/freedesktop/login1"
 #define SD_INTERFACE    "org.freedesktop.login1.Manager"
 
+static void resume_ok(struct EG25Manager *manager)
+{
+    manager->modem_state = EG25_STATE_CONFIGURED;
+    modem_resume_post(manager);
+}
+
 static gboolean check_modem_resume(struct EG25Manager *manager)
 {
-    g_message("Modem wasn't probed in time, restart it!");
     manager->modem_recovery_timer = 0;
+
+#ifdef HAVE_MMGLIB
+    if (manager->mm_modem) {
+        resume_ok(manager);
+        return FALSE;
+    }
+#endif
+
+    g_message("Modem wasn't probed in time, restart it!");
     modem_reset(manager);
 
     return FALSE;
@@ -184,8 +198,7 @@ static void signal_cb(GDBusProxy *proxy,
              * If modem is managed by ofono, we also do resume sequence immediately
              * as ofono handles resuming from sleep itself.
              */
-            manager->modem_state = EG25_STATE_CONFIGURED;
-            modem_resume_post(manager);
+            resume_ok(manager);
         } else {
             manager->modem_state = EG25_STATE_RESUMING;
             manager->modem_recovery_timer = g_timeout_add_seconds(manager->modem_recovery_timeout,

src/udev.c

@@ -11,18 +11,47 @@
 static void udev_event_cb(GUdevClient *client, gchar *action, GUdevDevice *device, gpointer data)
 {
     struct EG25Manager *manager = data;
+    const gchar *prop;
+    long vid = 0, pid = 0;
+
+    /*
+     * Act only if the device is the one identified as a modem by MM/ofono
+     */
+    if (!manager->modem_usb_id ||
+        strcmp(g_udev_device_get_name(device), manager->modem_usb_id) != 0) {
+        return;
+    }
+
+    prop = g_udev_device_get_property(device, "ID_VENDOR_ID");
+    if (prop)
+        vid = strtol(prop, NULL, 16);
+
+    prop = g_udev_device_get_property(device, "ID_MODEL_ID");
+    if (prop)
+        pid = strtol(prop, NULL, 16);
+
+    if (strcmp(action, "bind") == 0 && vid != manager->usb_vid && pid != manager->usb_pid) {
+        /*
+         * Modem is probably executing a FW upgrade, make sure we don't interrupt it
+         */
+        if (manager->schedule_reset_timer != 0) {
+            g_message("Modem re-appeared with different VID/PID, cancel reset.");
+            g_source_remove(manager->schedule_reset_timer);
+            manager->schedule_reset_timer = 0;
+        }
+        manager->modem_state = EG25_STATE_UPDATING;
+    }
 
     if (strcmp(action, "unbind") != 0 ||
+        manager->modem_state == EG25_STATE_UPDATING ||
         manager->modem_state == EG25_STATE_RESETTING ||
-        !manager->modem_usb_id) {
+        manager->complete_reset_timer != 0 ||
+        manager->schedule_reset_timer != 0) {
         return;
-        }
-
-    if (strcmp(g_udev_device_get_name(device), manager->modem_usb_id) == 0 &&
-        manager->reset_timer == 0) {
-        g_message("Lost modem, resetting...");
-        g_timeout_add_seconds(2, G_SOURCE_FUNC(modem_reset), manager);
     }
+
+    g_message("Lost modem, resetting...");
+    manager->schedule_reset_timer = g_timeout_add_seconds(3, G_SOURCE_FUNC(modem_reset), manager);
 }
 
 void udev_init (struct EG25Manager *manager, toml_table_t *config[])

udev/80-modem-eg25.rules

@@ -1,4 +1,18 @@
-ACTION=="add", SUBSYSTEM=="usb", DRIVERS=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/control}="auto"
-ACTION=="add", SUBSYSTEM=="usb", DRIVERS=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/autosuspend_delay_ms}="3000"
-ACTION=="add", SUBSYSTEM=="usb", DRIVERS=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/wakeup}="enabled"
-ACTION=="add", SUBSYSTEM=="usb", DRIVERS=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/persist}="0"
+ACTION=="add", SUBSYSTEM=="usb", DRIVERS=="usb", ENV{DEVTYPE}=="usb_device", GOTO="eg25_start"
+GOTO="eg25_end"
+
+# Default attributes values
+LABEL="eg25_start"
+ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/control}="auto"
+ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/autosuspend_delay_ms}="3000"
+ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/wakeup}="enabled"
+ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/persist}="0"
+
+# power/control needs to be "on" for the community-maintained firmware
+ATTRS{serial}=="community_fw", ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/control}="on"
+
+# Special trick for the PinePhone Pro: set power/persist to 1 *only* with the community FW
+# We can identify the PPP by looking for the string "pinephone-pro" in the device tree "compatible" property
+ATTRS{serial}=="community_fw", ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", PROGRAM=="/bin/grep pine64,pinephone-pro /proc/device-tree/compatible", ATTR{power/persist}="1"
+
+LABEL="eg25_end"