On Fri, Nov 13, 2015 at 09:49:30PM -0800, Andy Lutomirski wrote:
> The XPS 13 Skylake has an rfkill button and a switchvideomode button
> that aren't enumerated in the DMI table AFAICT. Add a table listing
> extra un-enumerated hotkeys. To avoid breaking things that worked
> before, these un-enumerated hotkeys won't be used if the DMI table
> maps them to something else.
>
> This also adds the Fn-lock key as a KE_IGNORE entry.
>
> Signed-off-by: Andy Lutomirski <l...@kernel.org>
> ---
> drivers/platform/x86/dell-wmi.c | 48
> +++++++++++++++++++++++++++++++++++------
> 1 file changed, 41 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
> index f2d77fe696ac..5be1abec4f64 100644
> --- a/drivers/platform/x86/dell-wmi.c
> +++ b/drivers/platform/x86/dell-wmi.c
> @@ -142,6 +142,16 @@ static const u16 bios_to_linux_keycode[256] __initconst
> = {
> 0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_PROG3
> };
>
> +/* These are applied if the hk table is present and doesn't override them. */
> +static const struct key_entry dell_wmi_extra_keymap[] __initconst = {
> + /* Fn-lock -- no action is required by the kernel. */
> + { KE_IGNORE, 0x151, { KEY_RESERVED } },
> +
> + /* Keys that need our help (on XPS 13 Skylake and maybe others. */
> + { KE_KEY, 0x152, { KEY_SWITCHVIDEOMODE } },
> + { KE_KEY, 0x153, { KEY_RFKILL } },
> +};
> +
> static struct input_dev *dell_wmi_input_dev;
>
> static void dell_wmi_process_key(int reported_key)
> @@ -300,9 +310,10 @@ static const struct key_entry * __init
> dell_wmi_prepare_new_keymap(void)
> int hotkey_num = (dell_bios_hotkey_table->header.length - 4) /
> sizeof(struct dell_bios_keymap_entry);
> struct key_entry *keymap;
> - int i;
> + int i, pos = 0, num_bios_keys;
Just a nit, "reverse christmas tree" order (longest line length first) please.
(only if you resend after this review for other reasons)
>
> - keymap = kcalloc(hotkey_num + 1, sizeof(struct key_entry), GFP_KERNEL);
> + keymap = kcalloc(hotkey_num + ARRAY_SIZE(dell_wmi_extra_keymap),
This previously allocated kotkey_num + 1, but you dropeed the +1, making it
eactly the size of hotkey_num + the new entries you added.
Why don't we need the +1 anymore? (it isn't clear to me why we needed to before
actually, but I want to confirm you considered it).
Thanks,
> + sizeof(struct key_entry), GFP_KERNEL);
> if (!keymap)
> return NULL;
>
> @@ -314,14 +325,37 @@ static const struct key_entry * __init
> dell_wmi_prepare_new_keymap(void)
> KEY_RESERVED;
>
> if (keycode == KEY_KBDILLUMTOGGLE)
> - keymap[i].type = KE_IGNORE;
> + keymap[pos].type = KE_IGNORE;
> else
> - keymap[i].type = KE_KEY;
> - keymap[i].code = bios_entry->scancode;
> - keymap[i].keycode = keycode;
> + keymap[pos].type = KE_KEY;
> + keymap[pos].code = bios_entry->scancode;
> + keymap[pos].keycode = keycode;
> +
> + pos++;
> + }
> +
> + num_bios_keys = pos;
> +
> + for (i = 0; i < ARRAY_SIZE(dell_wmi_extra_keymap); i++) {
> + int j;
> +
> + /*
> + * Check if we've already found this scancode. This takes
> + * quadratic time, but it doesn't matter unless the list
> + * of extra keys gets very long.
> + */
> + for (j = 0; j < num_bios_keys; j++)
> + if (keymap[j].code == dell_wmi_extra_keymap[i].code)
> + goto skip;
> +
> + keymap[pos] = dell_wmi_extra_keymap[i];
> + pos++;
> +
> +skip:
> + ;
> }
>
> - keymap[hotkey_num].type = KE_END;
> + keymap[pos].type = KE_END;
>
> return keymap;
> }
> --
> 2.5.0
>
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--
Darren Hart
Intel Open Source Technology Center
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