Fn keys on Dell Latitude E6440

Hello,

on my notebook dell-wmi kernel driver generates some scan codes when I press some of Fn key combinations. Now all these scan codes are mapped to key "prog3". I would like to add some actions for these Fn key combinations, so what do you think? Which key codes should be assigned for these scan codes? Note that these combinations are not special (and labeled) as other (like Fn+F11 = play/pause) and seems like windows does not recognize them.

Matthew, you are author of dell-wmi driver, do you know if there are some other secrets key combinations? And why first 10 Fn key combinations generate scan codes?

Output of commands:

$ lsinput

/dev/input/event7
bustype : BUS_HOST
vendor : 0x0
product : 0x0
version : 0
name : "Dell WMI hotkeys"
phys : "wmi/input0"
bits ev : EV_SYN EV_KEY EV_MSC

$ /lib/udev/keymap -i /dev/input/event7

scan code: 0x10 key code: prog3 --> Fn+Q
scan code: 0x11 key code: prog3 --> Fn+W
scan code: 0x12 key code: prog3 --> Fn+E
scan code: 0x13 key code: prog3 --> Fn+R
scan code: 0x14 key code: prog3 --> Fn+T

scan code: 0x1E key code: prog3 --> Fn+A
scan code: 0x1F key code: prog3 --> Fn+S
scan code: 0x20 key code: prog3 --> Fn+D
scan code: 0x21 key code: prog3 --> Fn+F
scan code: 0x22 key code: prog3 --> Fn+G

$ cat /sys/class/dmi/id/sys_vendor
Dell Inc.

$ cat /sys/class/dmi/id/product_name
Latitude E6440

Hello,

on my notebook dell-wmi kernel driver generates some scan codes when I press some of Fn key combinations. Now all these scan codes are mapped to key "prog3". I would like to add some actions for these Fn key combinations, so what do you think? Which key codes should be assigned for these scan codes? Note that these combinations are not special (and labeled) as other (like Fn+F11 = play/pause) and seems like windows does not recognize them.

Matthew, you are author of dell-wmi driver, do you know if there are some other secrets key combinations? And why first 10 Fn key combinations generate scan codes?

Output of commands:

$ lsinput

/dev/input/event7
bustype : BUS_HOST
vendor : 0x0
product : 0x0
version : 0
name : "Dell WMI hotkeys"
phys : "wmi/input0"
bits ev : EV_SYN EV_KEY EV_MSC

$ /lib/udev/keymap -i /dev/input/event7

scan code: 0x10 key code: prog3 --> Fn+Q
scan code: 0x11 key code: prog3 --> Fn+W
scan code: 0x12 key code: prog3 --> Fn+E
scan code: 0x13 key code: prog3 --> Fn+R
scan code: 0x14 key code: prog3 --> Fn+T

scan code: 0x1E key code: prog3 --> Fn+A
scan code: 0x1F key code: prog3 --> Fn+S
scan code: 0x20 key code: prog3 --> Fn+D
scan code: 0x21 key code: prog3 --> Fn+F
scan code: 0x22 key code: prog3 --> Fn+G

$ cat /sys/class/dmi/id/sys_vendor
Dell Inc.

$ cat /sys/class/dmi/id/product_name
Latitude E6440

There are already defined some Fn key combinations, but not all. This patch adds missing combinations for support in dell-wmi driver.

Signed-off-by Pali Rohár <[email protected]>

---
 include/uapi/linux/input.h |    6 ++++++
 1 file changed, 6 insertions(+)

include/uapi/linux/input.h +0 -0

index f484952..3a32799 100644

Hi Pali,

Quoted 16 lines · Pali Rohár

There are already defined some Fn key combinations, but not all. This patch adds missing combinations for support in dell-wmi driver.

Signed-off-by Pali Rohár <[email protected]>

---

 include/uapi/linux/input.h |    6 ++++++
 1 file changed, 6 insertions(+)

(quoted diff) +0 -0

b/include/uapi/linux/input.h index f484952..3a32799 100644

include/uapi/linux/input.h +0 -0

@@ -672,6 +672,12 @@ struct input_keymap_entry {
 

include/uapi/linux/input.h struct input_keymap_entry { · line 682

Quoted 10 lines

include/uapi/linux/input.h +6 -0

 #define KEY_FN_F		0x1e2
 #define KEY_FN_S		0x1e3
 #define KEY_FN_B		0x1e4
 
+#define KEY_FN_Q		0x1e5
+#define KEY_FN_W		0x1e6
+#define KEY_FN_R		0x1e7
+#define KEY_FN_T		0x1e8
+#define KEY_FN_A		0x1e9
+#define KEY_FN_G		0x1ea

What do they actually do?

Thanks.

Quoted 32 lines · On Saturday 17 May 2014 22:30:54 Dmitry Torokhov wrote:

Hi Pali,

Quoted 16 lines · Pali Rohár

There are already defined some Fn key combinations, but not all. This patch adds missing combinations for support in dell-wmi driver.

Signed-off-by Pali Rohár <[email protected]>

---

 include/uapi/linux/input.h |    6 ++++++
 1 file changed, 6 insertions(+)

(quoted diff) +0 -0

b/include/uapi/linux/input.h index f484952..3a32799 100644

include/uapi/linux/input.h +0 -0

@@ -672,6 +672,12 @@ struct input_keymap_entry {
 

include/uapi/linux/input.h struct input_keymap_entry { · line 682

Quoted 10 lines

include/uapi/linux/input.h +6 -0

 #define KEY_FN_F		0x1e2
 #define KEY_FN_S		0x1e3
 #define KEY_FN_B		0x1e4
 
+#define KEY_FN_Q		0x1e5
+#define KEY_FN_W		0x1e6
+#define KEY_FN_R		0x1e7
+#define KEY_FN_T		0x1e8
+#define KEY_FN_A		0x1e9
+#define KEY_FN_G		0x1ea

What do they actually do?

Quoted 1 line

Thanks.

All 10 combinations Fn+Q ... Fn+T, Fn+A ... Fn+G are reported by WMI and I need to assign some keycodes for them in dell-wmi driver.

And because More FN_* constants are already defined in input.h I added those which are missing.

With this patch series I'm able to use above Fn combinations for my own keyboard shortcuts. Before this patch all Fn combinations were one same keycode - which was useless.