Hi Joey Lee,
Finally I've got little time to expriment.
On Wednesday 16 March 2011 09:59:16 Joey Lee wrote:
> Hi OldÅich,
>
> æ äï2011-03-16 æ 07:32 +0100ïOldÅich JedliÄka æåï
>
> > > After trace rfkill-input stuff, I thought this is rfkill-input's normal
> > > behavior but not a bug.
> > >
> > > Unfortunately, I didn't find any workaround way when a driver need to
> > > call rfkill_init_sw_state, e.g. acer-wmi driver.
> > >
> > > The rfkill-input will sync the rfkill state to all killswitchs that
> > > have the same type. For example, acer-wmi set the initial software
> > > switch to _BLOCK_ when driver initial, then rfkill-input will also set
> > > any new bluetooth killswitch state to _BLOCK_ .
> >
> > The rfkill_sync_work syncs with rfkill_global_states, which is set during
> > intitialization or by rfkill_switch_all, if I read it correctly. This
> > should be independent to acer-bluetooth state. The
> > rfkill_global_states[BLUETOOTH] should be unblocked initially, I need to
> > verify it.
>
> Yes!
> Ideally, killswitch state should be independent to different driver,
> even the killswitch type is the same.
>
> But,
> If you enabled CONFIG_RFKILL_INPUT, then rfkill_register will replicate
> state for each killswitch that have the same type:
>
> vi net/rfkill/core.c
>
> int __must_check rfkill_register(struct rfkill *rfkill)
> {
> ...
> if (!rfkill->persistent || rfkill_epo_lock_active) {
> schedule_work(&rfkill->sync_work);
> } else { /* if rfkill->persistent then set the state to all
the
> same type */ #ifdef CONFIG_RFKILL_INPUT /* when CONFIG_RFKILL_INPUT = Y */
> bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
>
> if (!atomic_read(&rfkill_input_disabled))
> __rfkill_switch_all(rfkill->type, soft_blocked); /*
> here call switch all to sync state */ #endif
> }
>
> When any driver call rfkill_init_sw_state for set the initial state to
> killswitch, this rfkill->persistent will set to true:
>
> void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked) /* acer-
wmi
> driver used it to set inital killswitch state */ {
> ....
> spin_lock_irqsave(&rfkill->lock, flags);
> __rfkill_set_sw_state(rfkill, blocked);
> rfkill->persistent = true /* persistent set to true */
>
>
> That's why acer-wmi bluetooth killswitch's state was been replicate to
> hci_core's killswitch state.
>
> When CONFIG_RFKILL_INPUT set to Y, and any driver call
> rfkill_init_sw_state before register rfkill, then rfkill_register will
> try to sync state to the same killswitch type like the above.
>
> It's make sense,
> because rfkill-input only can block/unblock the same killswitch type at
> the same time, before rfkill-input active, it want all the same type's
> state is full the same.
>
> And,
> rfkill-input also suppose user only can use keycode (maybe Fn key) to
> control killswitch state, so, direct use rkill tool or echo state to
> killswitch for change the state will cause killswitchs' state lost link.
> It like we do.
>
> > There is some magic in rfkill/input.c that plays with global states, but
> > I don't know if or how that one is used in my case.
>
> Suggest you can disable CONFIG_RFKILL_INPUT or markup the following
> code. You will see the new bluetooth killswitch will be unblock when it
> created.
>
> diff --git a/net/rfkill/core.c b/net/rfkill/core.c
> index 0198191..0dec078 100644
> --- a/net/rfkill/core.c
> +++ b/net/rfkill/core.c
> @@ -950,14 +950,14 @@ int __must_check rfkill_register(struct rfkill
> *rfkill)
>
> if (!rfkill->persistent || rfkill_epo_lock_active) {
> schedule_work(&rfkill->sync_work);
> - } else {
> -#ifdef CONFIG_RFKILL_INPUT
> - bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
> -
> - if (!atomic_read(&rfkill_input_disabled))
> - __rfkill_switch_all(rfkill->type, soft_blocked);
> -#endif
> - }
> + } //else {
> +//#ifdef CONFIG_RFKILL_INPUT
> +// bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
> +//
> +// if (!atomic_read(&rfkill_input_disabled))
> +// __rfkill_switch_all(rfkill->type, soft_blocked);
> +//#endif
> +// }
>
> rfkill_send_events(rfkill, RFKILL_OP_ADD);
Both work. I've tested first CONFIG_RFKILL_INPUT disabled. Second I've tried to
enable CONFIG_RFKILL_INPUT, but remove the mentioned block of code. The result
is working bluetooth HW switch.
> > > Acer's BIOS default setup bluetooth's state is disable when system cold
> > > boot, and BIOS also can save the connection devices' state when system
> > > reboot. Currently, acer-wmi driver have right behavior to sync the
> > > state with BIOS.
> > >
> > > Face to your situation, my suggestion is:
> > >
> > > - Use userland application to correct killswitch state.
> > >
> > > highly suggest You can try urfkill daemon:
> > > http://www.freedesktop.org/wiki/Software/urfkill or
> > >
> > > write a startup script to enable bluetooth when system boot.
> > >
> > > - Disable rfkill-input module if you didn't real use it.
> > >
> > > The TravelMate 5730G have wifi hotkey that only emit KEY_WLAN, but
> > > doesn't emit KEY_BLUETOOTH, that means rfkill-input cann't help you
> > > enable bluetooth killswitch.
> >
> > I didn't have time to look at the problem more deeply to identify who is
> > setting the global state to "blocked" or what really happens. Anyway, I
> > did some testing with pressing the HW bluetooth switch and I saw the
> > following immediately _after_ pressing the HW switch to enable
> > bluetooth:
> >
> > oldium ~ # rfkill list
> > 0: acer-wireless: Wireless LAN
> >
> > Soft blocked: no
> > Hard blocked: no
> >
> > 1: acer-bluetooth: Bluetooth
> >
> > Soft blocked: no
> > Hard blocked: no
> >
> > 2: acer-threeg: Wireless WAN
> >
> > Soft blocked: yes
> > Hard blocked: no
> >
> > 3: phy0: Wireless LAN
> >
> > Soft blocked: no
> > Hard blocked: no
> >
> > I had this output 3 times immediately after each other. I'm using
> > keyboard "up" and "enter" to repeat the last shell command, so this is a
> > relatively slow operation. So the state when the acer-bluetooth was
> > unblocked stayed for relatively long time before hci0 appeared in
> > rfkill. Afterwards I saw:
> >
> > oldium ~ # rfkill list
> > 0: acer-wireless: Wireless LAN
> >
> > Soft blocked: no
> > Hard blocked: no
> >
> > 1: acer-bluetooth: Bluetooth
> >
> > Soft blocked: no
> > Hard blocked: no
> >
> > 2: acer-threeg: Wireless WAN
> >
> > Soft blocked: yes
> > Hard blocked: no
> >
> > 3: phy0: Wireless LAN
> >
> > Soft blocked: no
> > Hard blocked: no
> >
> > 5: hci0: Bluetooth
> >
> > Soft blocked: yes
> > Hard blocked: no
>
> My Acer machine have no HW bluetooth key but only have one HW WLAN key
> that emit KEY_WLAN.
> Please use lshal to monitor your HW bluetooth key and make sure it emit
> KEY_BLUETOOTH.
`lshal -m` outputs this:
<bluetooth key pressed>
20:45:53.694: platform_i8042_i8042_KBD_port_logicaldev_input condition
ButtonPressed = bluetooth
20:45:54.666: platform_acer_wmi_rfkill_acer_bluetooth_bluetooth property
killswitch.state = 1 (0x1)
20:45:54.678: usb_device_a5c_2101_noserial added
...
<bluetooth key pressed again>
20:46:02.435: platform_i8042_i8042_KBD_port_logicaldev_input condition
ButtonPressed = brightness-up
20:46:02.668: platform_acer_wmi_rfkill_acer_bluetooth_bluetooth property
killswitch.state = 0 (0x0)
20:46:02.919: usb_device_a5c_2101_noserial_if1 removed
...
Strange is "brightness-up" key, somebody is wrong here.
> > So it looks like the hci0 went blocked even when the acer-bluetooth
> > switch was unblocked. So it looks like the hci0 state is independent on
> > the initial acer- bluetooth state.
> >
> > Hopefully I have some time this evening (CET timezone) to add some stack
> > traces and logs to see what really happens on my system.
> >
> > Cheers,
> > OldÅich.
>
> Still suggest you can disable CONFIG_RFKILL_INPUT then use rfkill tool
> to set acer-wmi bluetooth killswitch for test, must have different
> result.
Disabling CONFIG_RFKILL_INPUT works - see above. I had a look at Kconfig in
net/rfkill and there is a line "default y if !EXPERT" which means (I think)
that it would be enabled by default for anybody not enabling expert options.
So other non-expert users would have the same troubles as I have.
I've tried `rfkill unblock <acer-bluetooth number>` with my second test
(enabled CONFIG_RFKILL_INPUT plus patched core.c) - it works perfectly.
Anyway, it looks like using CONFIG_RFKILL_INPUT is broken to some degree,
because enabling the config switch changes bluetooth HW/SW switch from working
to not-fully-working.
Cheers,
OldÅich.
>
>
> Thank's
> Joey Lee
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
