/*
* Get the device ready for USB port or system standby and hibernation
*
* USB port and system standby are handled the same.
*
* When the system hibernates, the USB device is powered down and then
* up, so we don't really have to do much here, as it will be seen as
* a reconnect. Still for simplicity we consider this case the same as
* suspend, so that the device has a chance to do notify the base
* station (if connected).
*
* So at the end, the three cases require common handling.
*
* If at the time of this call the device's firmware is not loaded,
* nothing has to be done.
*
* If the firmware is loaded, we need to:
*
* - tell the device to go into host interface power save mode, wait
* for it to ack
*
* This is quite more interesting than it is; we need to execute a
* command, but this time, we don't want the code in usb-{tx,rx}.c
* to call the usb_autopm_get/put_interface() barriers as it'd
* deadlock, so we need to decrement i2400mu->do_autopm, that acts
* as a poor man's semaphore. Ugly, but it works.
*
* As well, the device might refuse going to sleep for whichever
* reason. In this case we just fail. For system suspend/hibernate,
* we *can't* fail. We look at usb_dev->auto_pm to see if the
* suspend call comes from the USB stack or from the system and act
* in consequence.
*
* - stop the notification endpoint polling
*/
static
int i2400mu_suspend(struct usb_interface *iface, pm_message_t pm_msg)
{
int result = 0;
struct device *dev = &iface->dev;
struct i2400mu *i2400mu = usb_get_intfdata(iface);
#ifdef CONFIG_PM
struct usb_device *usb_dev = i2400mu->usb_dev;
#endif
unsigned is_autosuspend = 0;
struct i2400m *i2400m = &i2400mu->i2400m;
#ifdef CONFIG_PM
if (usb_dev->auto_pm > 0)
is_autosuspend = 1;
#endif
d_fnstart(3, dev, "(iface %p pm_msg %u)\n", iface, pm_msg.event);
if (i2400m->updown == 0)
goto no_firmware;
if (i2400m->state == I2400M_SS_DATA_PATH_CONNECTED && is_autosuspend) {
/* ugh -- the device is connected and this suspend
* request is an autosuspend one (not a system standby
* / hibernate).
*
* The only way the device can go to standby is if the
* link with the base station is in IDLE mode; that
* were the case, we'd be in status
* I2400M_SS_CONNECTED_IDLE. But we are not.
*
* If we *tell* him to go power save now, it'll reset
* as a precautionary measure, so if this is an
* autosuspend thing, say no and it'll come back
* later, when the link is IDLE
*/
result = -EBADF;
d_printf(1, dev, "fw up, link up, not-idle, autosuspend: "
"not entering powersave\n");
goto error_not_now;
}
d_printf(1, dev, "fw up: entering powersave\n");
atomic_dec(&i2400mu->do_autopm);
result = i2400m_cmd_enter_powersave(i2400m);
atomic_inc(&i2400mu->do_autopm);
if (result < 0 && !is_autosuspend) {
/* System suspend, can't fail */
dev_err(dev, "failed to suspend, will reset on resume\n");
result = 0;
}
if (result < 0)
goto error_enter_powersave;
i2400mu_notification_release(i2400mu);
d_printf(1, dev, "powersave requested\n");
error_enter_powersave:
error_not_now:
no_firmware:
d_fnend(3, dev, "(iface %p pm_msg %u) = %d\n",
iface, pm_msg.event, result);
return result;
}
static
int i2400mu_suspend(struct usb_interface *iface, pm_message_t pm_msg)
{
int result = 0;
struct device *dev = &iface->dev;
struct i2400mu *i2400mu = usb_get_intfdata(iface);
unsigned is_autosuspend = 0;
struct i2400m *i2400m = &i2400mu->i2400m;
#ifdef CONFIG_PM
if (PMSG_IS_AUTO(pm_msg))
is_autosuspend = 1;
#endif
d_fnstart(3, dev, "(iface %p pm_msg %u)\n", iface, pm_msg.event);
rmb(); /* */
if (i2400m->updown == 0)
goto no_firmware;
if (i2400m->state == I2400M_SS_DATA_PATH_CONNECTED && is_autosuspend) {
/*
*/
result = -EBADF;
d_printf(1, dev, "fw up, link up, not-idle, autosuspend: "
"not entering powersave\n");
goto error_not_now;
}
d_printf(1, dev, "fw up: entering powersave\n");
atomic_dec(&i2400mu->do_autopm);
result = i2400m_cmd_enter_powersave(i2400m);
atomic_inc(&i2400mu->do_autopm);
if (result < 0 && !is_autosuspend) {
/* */
dev_err(dev, "failed to suspend, will reset on resume\n");
result = 0;
}
if (result < 0)
goto error_enter_powersave;
i2400mu_notification_release(i2400mu);
d_printf(1, dev, "powersave requested\n");
error_enter_powersave:
error_not_now:
no_firmware:
d_fnend(3, dev, "(iface %p pm_msg %u) = %d\n",
iface, pm_msg.event, result);
return result;
}
static
void i2400mu_bus_dev_stop(struct i2400m *i2400m)
{
struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
struct device *dev = &i2400mu->usb_iface->dev;
d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
i2400mu_notification_release(i2400mu);
i2400mu_rx_release(i2400mu);
i2400mu_tx_release(i2400mu);
d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
}
