From a464afb9581f6a9eabce8a4aa0c70cb71e6bf4d9 Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Mon, 15 Feb 2016 08:32:36 -0800 Subject: [PATCH] dell-wmi: Support new hotkeys on the XPS 13 9350 (Skylake) MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The XPS 13 9350 sends WMI keypress events that aren't enumerated in the DMI table. Add a table listing them. To avoid breaking things that worked before, these un-enumerated hotkeys won't be used if the DMI table maps them to something else. FWIW, it appears that the DMI table may be a legacy thing and we might want to rethink how we handle events in general. As an example, a whole lot of things map to KEY_PROG3 via the DMI table. This doesn't send keypress events for any of the new events. They appear to all be handled by other means (keyboard illumination is handled automatically and rfkill is handled by intel-hid). Signed-off-by: Andy Lutomirski Acked-by: Pali Rohár Signed-off-by: Darren Hart --- drivers/platform/x86/dell-wmi.c | 71 +++++++++++++++++++++++++++++---- 1 file changed, 64 insertions(+), 7 deletions(-) diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c index 32808a463325..e38258a82be5 100644 --- a/drivers/platform/x86/dell-wmi.c +++ b/drivers/platform/x86/dell-wmi.c @@ -169,6 +169,30 @@ static const u16 bios_to_linux_keycode[256] __initconst = { [255] = KEY_PROG3, }; +/* + * These are applied if the 0xB2 DMI hotkey table is present and doesn't + * override them. + */ +static const struct key_entry dell_wmi_extra_keymap[] __initconst = { + /* Fn-lock */ + { KE_IGNORE, 0x151, { KEY_RESERVED } }, + + /* Change keyboard illumination */ + { KE_IGNORE, 0x152, { KEY_KBDILLUMTOGGLE } }, + + /* + * Radio disable (notify only -- there is no model for which the + * WMI event is supposed to trigger an action). + */ + { KE_IGNORE, 0x153, { KEY_RFKILL } }, + + /* RGB keyboard backlight control */ + { KE_IGNORE, 0x154, { KEY_RESERVED } }, + + /* Stealth mode toggle */ + { KE_IGNORE, 0x155, { KEY_RESERVED } }, +}; + static struct input_dev *dell_wmi_input_dev; static void dell_wmi_process_key(int reported_key) @@ -340,13 +364,27 @@ static void dell_wmi_notify(u32 value, void *context) kfree(obj); } +static bool have_scancode(u32 scancode, const struct key_entry *keymap, int len) +{ + int i; + + for (i = 0; i < len; i++) + if (keymap[i].code == scancode) + return true; + + return false; +} + static void __init handle_dmi_entry(const struct dmi_header *dm, + void *opaque) + { struct dell_dmi_results *results = opaque; struct dell_bios_hotkey_table *table; + int hotkey_num, i, pos = 0; struct key_entry *keymap; - int hotkey_num, i; + int num_bios_keys; if (results->err || results->keymap) return; /* We already found the hotkey table. */ @@ -370,7 +408,8 @@ static void __init handle_dmi_entry(const struct dmi_header *dm, return; } - keymap = kcalloc(hotkey_num + 1, sizeof(struct key_entry), GFP_KERNEL); + keymap = kcalloc(hotkey_num + ARRAY_SIZE(dell_wmi_extra_keymap) + 1, + sizeof(struct key_entry), GFP_KERNEL); if (!keymap) { results->err = -ENOMEM; return; @@ -398,14 +437,32 @@ static void __init handle_dmi_entry(const struct dmi_header *dm, } 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++) { + const struct key_entry *entry = &dell_wmi_extra_keymap[i]; + + /* + * 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. + */ + if (!have_scancode(entry->code, keymap, num_bios_keys)) { + keymap[pos] = *entry; + pos++; + } } - keymap[hotkey_num].type = KE_END; + keymap[pos].type = KE_END; results->keymap = keymap; } -- 2.20.1