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usb: enter to exclusive disk mode only when required by usb config

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currently, exclusive disk mode was enabled at the same time as the
usb insertion. when multiple usb configurations exist, this is not
appropriate.

manage it in the core and enable it only when necessary.

Change-Id: Iadbec05fad1d1319471233227ae0e72c12079295
This commit is contained in:
mojyack 2026-01-16 17:08:12 +09:00 • committed by Solomon Peachy
parent 1951c17e0b
commit 33d0a3efa3
4 changed files with 129 additions and 113 deletions
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9
firmware/export/usb.h
View file

@ -189,9 +189,7 @@ struct usb_transfer_completion_event_data
void usb_init(void) INIT_ATTR;
/* target must implement this to enable/disable the usb transceiver/core */
void usb_enable(bool on);
/* when one or more driver requires exclusive mode, this is called after all threads have acknowledged
* exclusive mode and disk have been umounted; otherwise it is called immediately after host has
* been detected */
/* called after host has been detected */
void usb_attach(void);
/* enable usb detection monitoring; before this function is called, all usb
* detection changes are ignored */
@ -252,6 +250,11 @@ bool usb_driver_enabled(int driver);
bool usb_exclusive_storage(void);
#endif /* HAVE_USBSTACK */
/* broadcast usb insertion event to enable exclusive storage */
void usb_request_exclusive_storage(void);
/* finish exclusive storage access if enabled and mount volumes */
void usb_release_exclusive_storage(void);
#ifdef USB_FIREWIRE_HANDLING
bool firewire_detect(void);
void usb_firewire_connect_event(void);

1
firmware/export/usb_core.h
View file

@ -56,7 +56,6 @@ void usb_core_control_complete(int status);
void usb_core_legacy_control_request(struct usb_ctrlrequest* req);
void usb_core_transfer_complete(int endpoint,int dir,int status,int length);
void usb_core_bus_reset(void);
bool usb_core_any_exclusive_storage(void);
void usb_core_enable_driver(int driver,bool enabled);
bool usb_core_driver_enabled(int driver);
void usb_core_handle_transfer_completion(

210
firmware/usb.c
View file

@ -102,7 +102,8 @@ static unsigned int usb_thread_entry = 0;
static bool usb_monitor_enabled = false;
#endif /* USB_FULL_INIT */
static struct event_queue usb_queue SHAREDBSS_ATTR;
static bool exclusive_storage_access = false;
static bool exclusive_storage_requested = false;
static bool exclusive_storage_enabled = false;
#ifdef USB_ENABLE_HID
static bool usb_hid = true;
#endif
@ -113,14 +114,12 @@ static int usb_audio = 0;
#ifdef USB_FULL_INIT
static bool usb_host_present = false;
static int usb_num_acks_to_expect = 0;
static long usb_last_broadcast_tick = 0;
static uint32_t usb_broadcast_seqnum = 0x80000000;
#ifdef HAVE_USB_POWER
static int usb_mode = USBMODE_DEFAULT;
static int new_usbmode = USBMODE_DEFAULT;
static bool usb_power_only = false;
#endif
static int usb_release_exclusive_storage(void);
#if defined(USB_FIREWIRE_HANDLING)
static void try_reboot(void)
{
@ -206,7 +205,7 @@ static inline void usb_handle_hotswap(long id)
}
#endif /* HAVE_HOTSWAP */
static inline bool usb_configure_drivers(int for_state)
static inline void usb_configure_drivers(int for_state)
{
#ifdef USB_ENABLE_AUDIO
// FIXME: doesn't seem to get set when loaded at boot...
@ -232,9 +231,8 @@ static inline bool usb_configure_drivers(int for_state)
#ifdef USB_ENABLE_CHARGING_ONLY
usb_core_enable_driver(USB_DRIVER_CHARGING_ONLY, true);
#endif
exclusive_storage_access = false;
usb_attach(); /* Powered only: attach now. */
usb_attach();
break;
/* USB_POWERED: */
@ -251,25 +249,17 @@ static inline bool usb_configure_drivers(int for_state)
#ifdef USB_ENABLE_CHARGING_ONLY
usb_core_enable_driver(USB_DRIVER_CHARGING_ONLY, false);
#endif
/* Check any drivers enabled at this point for exclusive storage
* access requirements. */
exclusive_storage_access = usb_core_any_exclusive_storage();
if(exclusive_storage_access)
return true;
usb_attach(); /* Not exclusive: attach now. */
usb_attach();
break;
/* USB_INSERTED: */
case USB_EXTRACTED:
if(exclusive_storage_access)
usb_release_exclusive_storage();
/* do not call usb_release_exclusive_storage.
* usb core handles it */
break;
/* USB_EXTRACTED: */
}
return false;
}
static inline void usb_slave_mode(bool on)
@ -283,9 +273,8 @@ static inline void usb_slave_mode(bool on)
thread_set_priority(thread_self(), PRIORITY_REALTIME);
#endif
disk_unmount_all();
usb_attach();
}
else /* usb_state == USB_INSERTED (only!) */
else
{
#ifdef HAVE_PRIORITY_SCHEDULING
thread_set_priority(thread_self(), PRIORITY_SYSTEM);
@ -350,23 +339,20 @@ static inline void usb_handle_hotswap(long id)
}
#endif /* HAVE_HOTSWAP */
static inline bool usb_configure_drivers(int for_state)
static inline void usb_configure_drivers(int for_state)
{
switch(for_state)
{
case USB_POWERED:
exclusive_storage_access = false;
exclusive_storage_requested = false;
break;
case USB_INSERTED:
exclusive_storage_access = true;
return true;
usb_request_exclusive_storage();
break;
case USB_EXTRACTED:
if(exclusive_storage_access)
usb_release_exclusive_storage();
usb_release_exclusive_storage();
break;
}
return false;
}
static inline void usb_slave_mode(bool on)
@ -420,7 +406,7 @@ static void usb_set_host_present(bool present)
}
#ifdef HAVE_USB_POWER
if (new_usbmode == USB_MODE_CHARGE || new_usbmode == USB_MODE_ADB)
if (usb_power_only)
{
/* Only charging is desired */
usb_configure_drivers(USB_POWERED);
@ -428,44 +414,7 @@ static void usb_set_host_present(bool present)
}
#endif
if(!usb_configure_drivers(USB_INSERTED))
return; /* Exclusive storage access not required */
/* Tell all threads that they have to back off the storage.
We subtract one for our own thread. Expect an ACK for every
listener for each broadcast they received. If it has been too
long, the user might have entered a screen that didn't ACK
when inserting the cable, such as a debugging screen. In that
case, reset the count or else USB would be locked out until
rebooting because it most likely won't ever come. Simply
resetting to the most recent broadcast count is racy. */
if(TIME_AFTER(current_tick, usb_last_broadcast_tick + HZ*5))
{
usb_num_acks_to_expect = 0;
usb_last_broadcast_tick = current_tick;
}
usb_num_acks_to_expect += queue_broadcast(SYS_USB_CONNECTED, 0) - 1;
DEBUGF("usb: waiting for %d acks...\n", usb_num_acks_to_expect);
}
static bool usb_handle_connected_ack(void)
{
if(usb_num_acks_to_expect > 0 && --usb_num_acks_to_expect == 0)
{
DEBUGF("usb: all threads have acknowledged the connect.\n");
if(usb_host_present)
{
usb_slave_mode(true);
return true;
}
}
else
{
DEBUGF("usb: got ack, %d to go...\n", usb_num_acks_to_expect);
}
return false;
usb_configure_drivers(USB_INSERTED);
}
/*--- General driver code ---*/
@ -496,6 +445,7 @@ static void NORETURN_ATTR usb_thread(void)
break;
#ifdef USB_DETECT_BY_REQUEST
usb_state = USB_INSERTED;
usb_set_host_present(true);
#endif
@ -523,32 +473,40 @@ static void NORETURN_ATTR usb_thread(void)
#endif
send_event(SYS_EVENT_USB_INSERTED, &usb_mode);
#endif
/* Power (charging-only) button */
#ifdef HAVE_USB_POWER
new_usbmode = usb_mode;
switch (usb_mode) {
case USB_MODE_CHARGE:
case USB_MODE_ADB:
if (button_status() & ~USBPOWER_BTN_IGNORE)
new_usbmode = USB_MODE_MASS_STORAGE;
break;
default:
case USB_MODE_MASS_STORAGE:
if (button_status() & ~USBPOWER_BTN_IGNORE)
new_usbmode = USB_MODE_CHARGE;
break;
}
/* Power (charging-only) button */
usb_power_only = usb_mode != USB_MODE_MASS_STORAGE;
if(button_status() & ~USBPOWER_BTN_IGNORE) {
usb_power_only = !usb_power_only;
}
#endif
#ifndef USB_DETECT_BY_REQUEST
usb_state = USB_INSERTED;
usb_set_host_present(true);
#endif
break;
/* USB_INSERTED */
case SYS_USB_CONNECTED_ACK:
if(usb_handle_connected_ack())
usb_state = USB_INSERTED;
if((uint32_t)ev.data != usb_broadcast_seqnum) {
DEBUGF("usb: late ack %lX < %lX", ev.data, usb_broadcast_seqnum);
break;
}
if(usb_num_acks_to_expect == 0) {
DEBUGF("usb: unexpected ack");
break;
}
if(--usb_num_acks_to_expect > 0) {
DEBUGF("usb: got ack, %d to go...\n", usb_num_acks_to_expect);
break;
}
DEBUGF("usb: all threads have acknowledged the connect.\n");
if(usb_host_present && exclusive_storage_requested) {
usb_slave_mode(true);
exclusive_storage_enabled = true;
}
break;
/* SYS_USB_CONNECTED_ACK */
@ -563,15 +521,7 @@ static void NORETURN_ATTR usb_thread(void)
iap_reset_state(IF_IAP_MP(0));
#endif
/* Only disable the USB slave mode if we really have enabled
it. Some expected acks may not have been received. */
if(usb_state == USB_INSERTED)
usb_slave_mode(false);
usb_state = USB_EXTRACTED;
#ifdef HAVE_USB_POWER
new_usbmode = usb_mode;
#endif
#ifndef BOOTLOADER
send_event(SYS_EVENT_USB_EXTRACTED, NULL);
#endif
@ -857,18 +807,80 @@ bool usb_inserted(void)
bool usb_exclusive_storage(void)
{
/* Storage isn't actually exclusive until slave mode has been entered */
return exclusive_storage_access && usb_state == USB_INSERTED;
return exclusive_storage_enabled;
}
#endif /* HAVE_USBSTACK */
int usb_release_exclusive_storage(void)
/* exclusive storage mode transision
* HAVE_USBSTACK:
* (inserted)
* usb_set_host_present(true)
* usb_configure_drivers(USB_INSERTED)
* ...
* (SET_CONFIG(n) which requires exclusive storage)
* usb_core_do_set_config(n)
* usb_request_exclusive_storage()
* exclusive_storage_requested = true
* ...
* (all threads acked)
* usb_slave_mode(true)
* disk_unmount_all()
* exclusive_storage_enabled = true
* (exclusive mode done)
* ...
* (extracted, or SET_CONFIG(m) which does not require exclusive storage)
* usb_core_do_set_config(m)
* usb_release_exclusive_storage()
* exclusive_storage_requested = false
* exclusive_storage_enabled = false
* usb_slave_mode(false)
* disk_mount_all()
*
* !HAVE_USBSTACK:
* (inserted)
* usb_set_host_present(true)
* usb_configure_drivers(USB_INSERTED)
* usb_request_exclusive_storage()
* exclusive_storage_requested = true
* ...
* (all threads acked)
* usb_slave_mode(true)
* disk_unmount_all()
* exclusive_storage_enabled = true
* ...
* (extracted)
* usb_set_host_present(false)
* usb_configure_drivers(USB_EXTRACTED)
* usb_release_exclusive_storage()
* ..
* */
void usb_request_exclusive_storage(void)
{
int bccount;
exclusive_storage_access = false;
exclusive_storage_requested = true;
usb_broadcast_seqnum += 1;
usb_num_acks_to_expect = queue_broadcast(SYS_USB_CONNECTED, usb_broadcast_seqnum) - 1;
DEBUGF("usb: waiting for %d acks...\n", usb_num_acks_to_expect);
}
void usb_release_exclusive_storage(void)
{
if(!exclusive_storage_requested) {
return;
}
exclusive_storage_requested = false;
if(exclusive_storage_enabled) {
usb_slave_mode(false);
}
exclusive_storage_enabled = false;
#ifdef DEBUG
/* Tell all threads that we are back in business */
bccount = queue_broadcast(SYS_USB_DISCONNECTED, 0) - 1;
int bccount = queue_broadcast(SYS_USB_DISCONNECTED, 0) - 1;
DEBUGF("USB extracted. Broadcast to %d threads...\n", bccount);
return bccount;
#endif
return;
}
#ifdef USB_ENABLE_HID
@ -889,7 +901,7 @@ void usb_set_audio(int value)
#ifdef HAVE_USB_POWER
bool usb_powered_only(void)
{
return usb_state == USB_POWERED;
return usb_power_only;
}
#endif /* HAVE_USB_POWER */

22
firmware/usbstack/usb_core.c
View file

@ -544,16 +544,6 @@ bool usb_core_driver_enabled(int driver)
return drivers[driver].enabled;
}
bool usb_core_any_exclusive_storage(void)
{
int i;
for(i = 0; i < USB_NUM_DRIVERS; i++)
if(drivers[i].enabled && drivers[i].needs_exclusive_storage)
return true;
return false;
}
#ifdef HAVE_HOTSWAP
void usb_core_hotswap_event(int volume, bool inserted)
{
@ -874,16 +864,28 @@ static int usb_core_do_set_config(uint8_t new_config)
usb_config = new_config;
usb_state = usb_config == 0 ? ADDRESS : CONFIGURED;
bool require_exclusive = false;
/* activate new config */
if(usb_config != 0) {
init_deinit_endpoints(usb_config - 1, true);
for(int i = 0; i < USB_NUM_DRIVERS; i++) {
if(is_active(drivers[i]) && drivers[i].init_connection != NULL) {
drivers[i].init_connection();
require_exclusive |= drivers[i].needs_exclusive_storage;
}
}
}
if(require_exclusive) {
if(!usb_exclusive_storage()) {
usb_release_exclusive_storage();
usb_request_exclusive_storage();
}
} else {
usb_release_exclusive_storage();
}
#ifdef HAVE_USB_CHARGING_ENABLE
usb_charging_maxcurrent_change(usb_charging_maxcurrent());
#endif