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dell-laptop: Only install the i8042 filter when rfkill is active

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Installing the i8042 filter is not useful on machines where rfkill is not
whitelisted, so move the filter installation into dell_setup_rfkill,
after the whitelist check.

This avoids doing a needless and potentially troublesome rfkill query
(dell_send_request(buf, 17, 11)) when the wireless Fn key gets pressed on
non whitelisted laptops.

This patch was written as a result of:
https://bugzilla.redhat.com/show_bug.cgi?id=1045807
It is not yet clear if this is related, but it is a good idea to not register
the i8042 filter in general.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
This commit is contained in:
Hans de Goede 2013-12-24 20:34:01 +01:00 committed by Matthew Garrett
parent 997ab407d2
commit 97f440c23f
1 changed files with 32 additions and 31 deletions
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63
drivers/platform/x86/dell-laptop.c
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@ -559,6 +559,29 @@ static void dell_update_rfkill(struct work_struct *ignored)
}
static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
struct serio *port)
{
static bool extended;
if (str & 0x20)
return false;
if (unlikely(data == 0xe0)) {
extended = true;
return false;
} else if (unlikely(extended)) {
switch (data) {
case 0x8:
schedule_delayed_work(&dell_rfkill_work,
round_jiffies_relative(HZ / 4));
break;
}
extended = false;
}
return false;
}
static int __init dell_setup_rfkill(void)
{
@ -636,7 +659,16 @@ static int __init dell_setup_rfkill(void)
goto err_wwan;
}
ret = i8042_install_filter(dell_laptop_i8042_filter);
if (ret) {
pr_warn("Unable to install key filter\n");
goto err_filter;
}
return 0;
err_filter:
if (wwan_rfkill)
rfkill_unregister(wwan_rfkill);
err_wwan:
rfkill_destroy(wwan_rfkill);
if (bluetooth_rfkill)
@ -758,30 +790,6 @@ static void touchpad_led_exit(void)
led_classdev_unregister(&touchpad_led);
}
static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
struct serio *port)
{
static bool extended;
if (str & 0x20)
return false;
if (unlikely(data == 0xe0)) {
extended = true;
return false;
} else if (unlikely(extended)) {
switch (data) {
case 0x8:
schedule_delayed_work(&dell_rfkill_work,
round_jiffies_relative(HZ / 4));
break;
}
extended = false;
}
return false;
}
static int __init dell_init(void)
{
int max_intensity = 0;
@ -831,12 +839,6 @@ static int __init dell_init(void)
goto fail_rfkill;
}
ret = i8042_install_filter(dell_laptop_i8042_filter);
if (ret) {
pr_warn("Unable to install key filter\n");
goto fail_filter;
}
if (quirks && quirks->touchpad_led)
touchpad_led_init(&platform_device->dev);
@ -888,7 +890,6 @@ static int __init dell_init(void)
fail_backlight:
i8042_remove_filter(dell_laptop_i8042_filter);
cancel_delayed_work_sync(&dell_rfkill_work);
fail_filter:
dell_cleanup_rfkill();
fail_rfkill:
free_page((unsigned long)bufferpage);