platform/x86: thinkpad_acpi: Switch to using sparse-keymap helpers

Switch the hotkey keymap handling over to the sparse-keymap helpers,
there should be no functional changes from this.

Note all the mappings to KEY_UNKNOWN are removed since that is the default
behavior of sparse_keymap_report_event() for unknown scancodes.

Also drop the big comment about making changes to the keymaps since
the contents of that comment are mostly obsolete.

Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20240424122834.19801-20-hdegoede@redhat.com

1 files changed, 145 insertions, 259 deletions

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index cb2653a42a70..32b54e1d19bf 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -45,6 +45,7 @@
 #include <linux/hwmon-sysfs.h>
 #include <linux/init.h>
 #include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
 #include <linux/kthread.h>
@@ -1759,12 +1760,12 @@ enum {	/* hot key scan codes (derived from ACPI DSDT) */
 	TP_ACPI_HOTKEYSCAN_THINKPAD,
 	TP_ACPI_HOTKEYSCAN_UNK1,
 	TP_ACPI_HOTKEYSCAN_UNK2,
-	TP_ACPI_HOTKEYSCAN_UNK3,
+	TP_ACPI_HOTKEYSCAN_MICMUTE,
 	TP_ACPI_HOTKEYSCAN_UNK4,
-	TP_ACPI_HOTKEYSCAN_UNK5,
-	TP_ACPI_HOTKEYSCAN_UNK6,
-	TP_ACPI_HOTKEYSCAN_UNK7,
-	TP_ACPI_HOTKEYSCAN_UNK8,
+	TP_ACPI_HOTKEYSCAN_CONFIG,
+	TP_ACPI_HOTKEYSCAN_SEARCH,
+	TP_ACPI_HOTKEYSCAN_SCALE,
+	TP_ACPI_HOTKEYSCAN_FILE,
 
 	/* Adaptive keyboard keycodes */
 	TP_ACPI_HOTKEYSCAN_ADAPTIVE_START, /* 32 / 0x20 */
@@ -1779,7 +1780,7 @@ enum {	/* hot key scan codes (derived from ACPI DSDT) */
 	TP_ACPI_HOTKEYSCAN_UNK11,
 	TP_ACPI_HOTKEYSCAN_UNK12,
 	TP_ACPI_HOTKEYSCAN_UNK13,
-	TP_ACPI_HOTKEYSCAN_CONFIG,
+	TP_ACPI_HOTKEYSCAN_CONFIG2,
 	TP_ACPI_HOTKEYSCAN_NEW_TAB,
 	TP_ACPI_HOTKEYSCAN_RELOAD,
 	TP_ACPI_HOTKEYSCAN_BACK,
@@ -1801,9 +1802,6 @@ enum {	/* hot key scan codes (derived from ACPI DSDT) */
 	TP_ACPI_HOTKEYSCAN_NOTIFICATION_CENTER,
 	TP_ACPI_HOTKEYSCAN_PICKUP_PHONE,
 	TP_ACPI_HOTKEYSCAN_HANGUP_PHONE,
-
-	/* Hotkey keymap size */
-	TPACPI_HOTKEY_MAP_LEN
 };
 
 enum {	/* Keys/events available through NVRAM polling */
@@ -1916,8 +1914,6 @@ static u32 hotkey_driver_mask;		/* events needed by the driver */
 static u32 hotkey_user_mask;		/* events visible to userspace */
 static u32 hotkey_acpi_mask;		/* events enabled in firmware */
 
-static u16 *hotkey_keycode_map;
-
 static bool tpacpi_driver_event(const unsigned int hkey_event);
 static void hotkey_poll_setup(const bool may_warn);
 
@@ -2252,11 +2248,24 @@ static void tpacpi_input_send_tabletsw(void)
 
 static bool tpacpi_input_send_key(const u32 hkey, bool *send_acpi_ev)
 {
-	unsigned int keycode, scancode;
+	bool known_ev;
+	u32 scancode;
 
 	if (tpacpi_driver_event(hkey))
 		return true;
 
+	/*
+	 * Before the conversion to using the sparse-keymap helpers the driver used to
+	 * map the hkey event codes to 0x00 - 0x4d scancodes so that a straight scancode
+	 * indexed array could be used to map scancodes to keycodes:
+	 *
+	 * 0x1001 - 0x1020  ->  0x00 - 0x1f  (Original ThinkPad events)
+	 * 0x1103 - 0x1116  ->  0x20 - 0x33  (Adaptive keyboard, 2014 X1 Carbon)
+	 * 0x1300 - 0x1319  ->  0x34 - 0x4d  (Additional keys send in 2017+ models)
+	 *
+	 * The sparse-keymap tables still use these scancodes for these ranges to
+	 * preserve userspace API compatibility (e.g. hwdb keymappings).
+	 */
 	if (hkey >= TP_HKEY_EV_ORIG_KEY_START &&
 	    hkey <= TP_HKEY_EV_ORIG_KEY_END) {
 		scancode = hkey - TP_HKEY_EV_ORIG_KEY_START;
@@ -2279,23 +2288,14 @@ static bool tpacpi_input_send_key(const u32 hkey, bool *send_acpi_ev)
 		if (send_acpi_ev)
 			*send_acpi_ev = false;
 
-		return false;
+		scancode = hkey;
 	}
 
-	keycode = hotkey_keycode_map[scancode];
-
 	mutex_lock(&tpacpi_inputdev_send_mutex);
-
-	input_event(tpacpi_inputdev, EV_MSC, MSC_SCAN, scancode);
-	input_report_key(tpacpi_inputdev, keycode, 1);
-	input_sync(tpacpi_inputdev);
-
-	input_report_key(tpacpi_inputdev, keycode, 0);
-	input_sync(tpacpi_inputdev);
-
+	known_ev = sparse_keymap_report_event(tpacpi_inputdev, scancode, 1, true);
 	mutex_unlock(&tpacpi_inputdev_send_mutex);
 
-	return true;
+	return known_ev;
 }
 
 #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
@@ -3124,9 +3124,6 @@ static const struct tpacpi_quirk tpacpi_hotkey_qtable[] __initconst = {
 	TPACPI_Q_IBM('1', 'D', TPACPI_HK_Q_INIMASK), /* X22, X23, X24 */
 };
 
-typedef u16 tpacpi_keymap_entry_t;
-typedef tpacpi_keymap_entry_t tpacpi_keymap_t[TPACPI_HOTKEY_MAP_LEN];
-
 static int hotkey_init_tablet_mode(void)
 {
 	int in_tablet_mode = 0, res;
@@ -3163,217 +3160,124 @@ static int hotkey_init_tablet_mode(void)
 	return in_tablet_mode;
 }
 
-static int __init hotkey_init(struct ibm_init_struct *iibm)
-{
-	/* Requirements for changing the default keymaps:
-	 *
-	 * 1. Many of the keys are mapped to KEY_RESERVED for very
-	 *    good reasons.  Do not change them unless you have deep
-	 *    knowledge on the IBM and Lenovo ThinkPad firmware for
-	 *    the various ThinkPad models.  The driver behaves
-	 *    differently for KEY_RESERVED: such keys have their
-	 *    hot key mask *unset* in mask_recommended, and also
-	 *    in the initial hot key mask programmed into the
-	 *    firmware at driver load time, which means the firm-
-	 *    ware may react very differently if you change them to
-	 *    something else;
-	 *
-	 * 2. You must be subscribed to the linux-thinkpad and
-	 *    ibm-acpi-devel mailing lists, and you should read the
-	 *    list archives since 2007 if you want to change the
-	 *    keymaps.  This requirement exists so that you will
-	 *    know the past history of problems with the thinkpad-
-	 *    acpi driver keymaps, and also that you will be
-	 *    listening to any bug reports;
-	 *
-	 * 3. Do not send thinkpad-acpi specific patches directly to
-	 *    for merging, *ever*.  Send them to the linux-acpi
-	 *    mailinglist for comments.  Merging is to be done only
-	 *    through acpi-test and the ACPI maintainer.
-	 *
-	 * If the above is too much to ask, don't change the keymap.
-	 * Ask the thinkpad-acpi maintainer to do it, instead.
+static const struct key_entry keymap_ibm[] __initconst = {
+	/* Original hotkey mappings translated scancodes 0x00 - 0x1f */
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF1, { KEY_FN_F1 } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF2, { KEY_BATTERY } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF3, { KEY_COFFEE } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF4, { KEY_SLEEP } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF5, { KEY_WLAN } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF6, { KEY_FN_F6 } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF7, { KEY_SWITCHVIDEOMODE } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF8, { KEY_FN_F8 } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF9, { KEY_FN_F9 } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF10, { KEY_FN_F10 } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF11, { KEY_FN_F11 } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF12, { KEY_SUSPEND } },
+	/* Brightness: firmware always reacts, suppressed through hotkey_reserved_mask. */
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNHOME, { KEY_BRIGHTNESSUP } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNEND, { KEY_BRIGHTNESSDOWN } },
+	/* Thinklight: firmware always reacts, suppressed through hotkey_reserved_mask. */
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNPAGEUP, { KEY_KBDILLUMTOGGLE } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNSPACE, { KEY_ZOOM } },
+	/*
+	 * Volume: firmware always reacts and reprograms the built-in *extra* mixer.
+	 * Suppressed by default through hotkey_reserved_mask.
+	 */
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_VOLUMEUP, { KEY_VOLUMEUP } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_VOLUMEDOWN, { KEY_VOLUMEDOWN } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_MUTE, { KEY_MUTE } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_THINKPAD, { KEY_VENDOR } },
+	{ KE_END }
+};
+
+static const struct key_entry keymap_lenovo[] __initconst = {
+	/* Original hotkey mappings translated scancodes 0x00 - 0x1f */
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF1, { KEY_FN_F1 } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF2, { KEY_COFFEE } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF3, { KEY_BATTERY } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF4, { KEY_SLEEP } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF5, { KEY_WLAN } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF6, { KEY_CAMERA, } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF7, { KEY_SWITCHVIDEOMODE } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF8, { KEY_FN_F8 } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF9, { KEY_FN_F9 } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF10, { KEY_FN_F10 } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF11, { KEY_FN_F11 } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNF12, { KEY_SUSPEND } },
+	/*
+	 * These should be enabled --only-- when ACPI video is disabled and
+	 * are handled in a special way by the init code.
+	 */
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNHOME, { KEY_BRIGHTNESSUP } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNEND, { KEY_BRIGHTNESSDOWN } },
+	/* Suppressed by default through hotkey_reserved_mask. */
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNPAGEUP, { KEY_KBDILLUMTOGGLE } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FNSPACE, { KEY_ZOOM } },
+	/*
+	 * Volume: z60/z61, T60 (BIOS version?): firmware always reacts and
+	 * reprograms the built-in *extra* mixer.
+	 * T60?, T61, R60?, R61: firmware and EC tries to send these over
+	 * the regular keyboard (not through tpacpi). There are still weird bugs
+	 * re. MUTE. May cause the BIOS to interfere with the HDA mixer.
+	 * Suppressed by default through hotkey_reserved_mask.
 	 */
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_VOLUMEUP, { KEY_VOLUMEUP } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_VOLUMEDOWN, { KEY_VOLUMEDOWN } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_MUTE, { KEY_MUTE } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_THINKPAD, { KEY_VENDOR } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_MICMUTE, { KEY_MICMUTE } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_CONFIG, { KEY_CONFIG } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_SEARCH, { KEY_SEARCH } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_SCALE, { KEY_SCALE } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FILE, { KEY_FILE } },
+	/* Adaptive keyboard mappings for Carbon X1 2014 translated scancodes 0x20 - 0x33 */
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_MUTE2, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_BRIGHTNESS_ZERO, { KEY_BRIGHTNESS_MIN } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_CLIPPING_TOOL, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_CLOUD, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_UNK9, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_VOICE, { KEY_VOICECOMMAND } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_UNK10, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_GESTURES, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_UNK11, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_UNK12, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_UNK13, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_CONFIG2, { KEY_CONFIG } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_NEW_TAB, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_RELOAD, { KEY_REFRESH } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_BACK, { KEY_BACK } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_MIC_DOWN, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_MIC_UP, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_MIC_CANCELLATION, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_CAMERA_MODE, { KEY_RESERVED } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_ROTATE_DISPLAY, { KEY_RESERVED } },
+	/* Extended hotkeys mappings translated scancodes 0x34 - 0x4d */
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_STAR, { KEY_BOOKMARKS } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_CLIPPING_TOOL2, { KEY_SELECTIVE_SCREENSHOT } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_CALCULATOR, { KEY_CALC } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_BLUETOOTH, { KEY_BLUETOOTH } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_KEYBOARD, { KEY_KEYBOARD } },
+	/* Used by "Lenovo Quick Clean" */
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_FN_RIGHT_SHIFT, { KEY_FN_RIGHT_SHIFT } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_NOTIFICATION_CENTER, { KEY_NOTIFICATION_CENTER } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_PICKUP_PHONE, { KEY_PICKUP_PHONE } },
+	{ KE_KEY, TP_ACPI_HOTKEYSCAN_HANGUP_PHONE, { KEY_HANGUP_PHONE } },
+	/*
+	 * All mapping below are for raw untranslated hkey event codes mapped directly
+	 * after switching to sparse keymap support. The mappings above use translated
+	 * scancodes to preserve uAPI compatibility, see tpacpi_input_send_key().
+	 */
+	{ KE_END }
+};
 
+static int __init hotkey_init(struct ibm_init_struct *iibm)
+{
 	enum keymap_index {
 		TPACPI_KEYMAP_IBM_GENERIC = 0,
 		TPACPI_KEYMAP_LENOVO_GENERIC,
 	};
 
-	static const tpacpi_keymap_t tpacpi_keymaps[] __initconst = {
-	/* Generic keymap for IBM ThinkPads */
-	[TPACPI_KEYMAP_IBM_GENERIC] = {
-		/* Scan Codes 0x00 to 0x0B: ACPI HKEY FN+F1..F12 */
-		KEY_FN_F1,	KEY_BATTERY,	KEY_COFFEE,	KEY_SLEEP,
-		KEY_WLAN,	KEY_FN_F6, KEY_SWITCHVIDEOMODE, KEY_FN_F8,
-		KEY_FN_F9,	KEY_FN_F10,	KEY_FN_F11,	KEY_SUSPEND,
-
-		/* Scan codes 0x0C to 0x1F: Other ACPI HKEY hot keys */
-		KEY_UNKNOWN,	/* 0x0C: FN+BACKSPACE */
-		KEY_UNKNOWN,	/* 0x0D: FN+INSERT */
-		KEY_UNKNOWN,	/* 0x0E: FN+DELETE */
-
-		/* brightness: firmware always reacts to them.
-		 * Suppressed by default through hotkey_reserved_mask.
-		 */
-		KEY_BRIGHTNESSUP,	/* 0x0F: FN+HOME (brightness up) */
-		KEY_BRIGHTNESSDOWN,	/* 0x10: FN+END (brightness down) */
-
-		/* Thinklight: firmware always react to it.
-		 * Suppressed by default through hotkey_reserved_mask.
-		 */
-		KEY_KBDILLUMTOGGLE,	/* 0x11: FN+PGUP (thinklight toggle) */
-
-		KEY_UNKNOWN,	/* 0x12: FN+PGDOWN */
-		KEY_ZOOM,	/* 0x13: FN+SPACE (zoom) */
-
-		/* Volume: firmware always react to it and reprograms
-		 * the built-in *extra* mixer.  Never map it to control
-		 * another mixer by default.
-		 * Suppressed by default through hotkey_reserved_mask.
-		 */
-		KEY_VOLUMEUP,	/* 0x14: VOLUME UP */
-		KEY_VOLUMEDOWN,	/* 0x15: VOLUME DOWN */
-		KEY_MUTE,	/* 0x16: MUTE */
-
-		KEY_VENDOR,	/* 0x17: Thinkpad/AccessIBM/Lenovo */
-
-		/* (assignments unknown, please report if found) */
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-
-		/* No assignments, only used for Adaptive keyboards. */
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-
-		/* No assignment, used for newer Lenovo models */
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN
-
-		},
-
-	/* Generic keymap for Lenovo ThinkPads */
-	[TPACPI_KEYMAP_LENOVO_GENERIC] = {
-		/* Scan Codes 0x00 to 0x0B: ACPI HKEY FN+F1..F12 */
-		KEY_FN_F1,	KEY_COFFEE,	KEY_BATTERY,	KEY_SLEEP,
-		KEY_WLAN,	KEY_CAMERA, KEY_SWITCHVIDEOMODE, KEY_FN_F8,
-		KEY_FN_F9,	KEY_FN_F10,	KEY_FN_F11,	KEY_SUSPEND,
-
-		/* Scan codes 0x0C to 0x1F: Other ACPI HKEY hot keys */
-		KEY_UNKNOWN,	/* 0x0C: FN+BACKSPACE */
-		KEY_UNKNOWN,	/* 0x0D: FN+INSERT */
-		KEY_UNKNOWN,	/* 0x0E: FN+DELETE */
-
-		/* These should be enabled --only-- when ACPI video
-		 * is disabled (i.e. in "vendor" mode), and are handled
-		 * in a special way by the init code */
-		KEY_BRIGHTNESSUP,	/* 0x0F: FN+HOME (brightness up) */
-		KEY_BRIGHTNESSDOWN,	/* 0x10: FN+END (brightness down) */
-
-		/* Suppressed by default through hotkey_reserved_mask. */
-		KEY_KBDILLUMTOGGLE,	/* 0x11: FN+PGUP (thinklight toggle) */
-
-		KEY_UNKNOWN,	/* 0x12: FN+PGDOWN */
-		KEY_ZOOM,	/* 0x13: FN+SPACE (zoom) */
-
-		/* Volume: z60/z61, T60 (BIOS version?): firmware always
-		 * react to it and reprograms the built-in *extra* mixer.
-		 * Never map it to control another mixer by default.
-		 *
-		 * T60?, T61, R60?, R61: firmware and EC tries to send
-		 * these over the regular keyboard, so these are no-ops,
-		 * but there are still weird bugs re. MUTE, so do not
-		 * change unless you get test reports from all Lenovo
-		 * models.  May cause the BIOS to interfere with the
-		 * HDA mixer.
-		 * Suppressed by default through hotkey_reserved_mask.
-		 */
-		KEY_VOLUMEUP,	/* 0x14: VOLUME UP */
-		KEY_VOLUMEDOWN,	/* 0x15: VOLUME DOWN */
-		KEY_MUTE,	/* 0x16: MUTE */
-
-		KEY_VENDOR,	/* 0x17: Thinkpad/AccessIBM/Lenovo */
-
-		/* (assignments unknown, please report if found) */
-		KEY_UNKNOWN, KEY_UNKNOWN,
-
-		/*
-		 * The mic mute button only sends 0x1a.  It does not
-		 * automatically mute the mic or change the mute light.
-		 */
-		KEY_MICMUTE,	/* 0x1a: Mic mute (since ?400 or so) */
-
-		/* (assignments unknown, please report if found) */
-		KEY_UNKNOWN,
-
-		/* Extra keys in use since the X240 / T440 / T540 */
-		KEY_CONFIG, KEY_SEARCH, KEY_SCALE, KEY_FILE,
-
-		/*
-		 * These are the adaptive keyboard keycodes for Carbon X1 2014.
-		 * The first item in this list is the Mute button which is
-		 * emitted with 0x103 through
-		 * adaptive_keyboard_hotkey_notify_hotkey() when the sound
-		 * symbol is held.
-		 * We'll need to offset those by 0x20.
-		 */
-		KEY_RESERVED,        /* Mute held, 0x103 */
-		KEY_BRIGHTNESS_MIN,  /* Backlight off */
-		KEY_RESERVED,        /* Clipping tool */
-		KEY_RESERVED,        /* Cloud */
-		KEY_RESERVED,
-		KEY_VOICECOMMAND,    /* Voice */
-		KEY_RESERVED,
-		KEY_RESERVED,        /* Gestures */
-		KEY_RESERVED,
-		KEY_RESERVED,
-		KEY_RESERVED,
-		KEY_CONFIG,          /* Settings */
-		KEY_RESERVED,        /* New tab */
-		KEY_REFRESH,         /* Reload */
-		KEY_BACK,            /* Back */
-		KEY_RESERVED,        /* Microphone down */
-		KEY_RESERVED,        /* Microphone up */
-		KEY_RESERVED,        /* Microphone cancellation */
-		KEY_RESERVED,        /* Camera mode */
-		KEY_RESERVED,        /* Rotate display, 0x116 */
-
-		/*
-		 * These are found in 2017 models (e.g. T470s, X270).
-		 * The lowest known value is 0x311, which according to
-		 * the manual should launch a user defined favorite
-		 * application.
-		 *
-		 * The offset for these is TP_ACPI_HOTKEYSCAN_EXTENDED_START,
-		 * corresponding to 0x34.
-		 */
-
-		/* (assignments unknown, please report if found) */
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-		KEY_UNKNOWN,
-
-		KEY_BOOKMARKS,			/* Favorite app, 0x311 */
-		KEY_SELECTIVE_SCREENSHOT,	/* Clipping tool */
-		KEY_CALC,			/* Calculator (above numpad, P52) */
-		KEY_BLUETOOTH,			/* Bluetooth */
-		KEY_KEYBOARD,			/* Keyboard, 0x315 */
-		KEY_FN_RIGHT_SHIFT,		/* Fn + right Shift */
-		KEY_NOTIFICATION_CENTER,	/* Notification Center */
-		KEY_PICKUP_PHONE,		/* Answer incoming call */
-		KEY_HANGUP_PHONE,		/* Decline incoming call */
-		},
-	};
-
 	static const struct tpacpi_quirk tpacpi_keymap_qtable[] __initconst = {
 		/* Generic maps (fallback) */
 		{
@@ -3388,17 +3292,11 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
 		},
 	};
 
-#define TPACPI_HOTKEY_MAP_SIZE		sizeof(tpacpi_keymap_t)
-#define TPACPI_HOTKEY_MAP_TYPESIZE	sizeof(tpacpi_keymap_entry_t)
-
-	int res, i;
-	int status;
-	int hkeyv;
+	unsigned long keymap_id, quirks;
+	const struct key_entry *keymap;
 	bool radiosw_state  = false;
 	bool tabletsw_state = false;
-
-	unsigned long quirks;
-	unsigned long keymap_id;
+	int hkeyv, res, status;
 
 	vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
 			"initializing hotkey subdriver\n");
@@ -3538,7 +3436,6 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
 	/* Set up key map */
 	keymap_id = tpacpi_check_quirks(tpacpi_keymap_qtable,
 					ARRAY_SIZE(tpacpi_keymap_qtable));
-	BUG_ON(keymap_id >= ARRAY_SIZE(tpacpi_keymaps));
 	dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
 		   "using keymap number %lu\n", keymap_id);
 
@@ -3551,27 +3448,17 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
 	 * Reserve brightness up/down unconditionally on IBM models, on Lenovo
 	 * models these are disabled based on acpi_video_get_backlight_type().
 	 */
-	if (keymap_id == TPACPI_KEYMAP_IBM_GENERIC)
+	if (keymap_id == TPACPI_KEYMAP_IBM_GENERIC) {
 		hotkey_reserved_mask |= TP_ACPI_HKEY_BRGHTUP_MASK |
 					TP_ACPI_HKEY_BRGHTDWN_MASK;
-
-	hotkey_keycode_map = kmemdup(&tpacpi_keymaps[keymap_id],
-			TPACPI_HOTKEY_MAP_SIZE,	GFP_KERNEL);
-	if (!hotkey_keycode_map) {
-		pr_err("failed to allocate memory for key map\n");
-		return -ENOMEM;
+		keymap = keymap_ibm;
+	} else {
+		keymap = keymap_lenovo;
 	}
 
-	input_set_capability(tpacpi_inputdev, EV_MSC, MSC_SCAN);
-	tpacpi_inputdev->keycodesize = TPACPI_HOTKEY_MAP_TYPESIZE;
-	tpacpi_inputdev->keycodemax = TPACPI_HOTKEY_MAP_LEN;
-	tpacpi_inputdev->keycode = hotkey_keycode_map;
-	for (i = 0; i < TPACPI_HOTKEY_MAP_LEN; i++) {
-		if (hotkey_keycode_map[i] != KEY_RESERVED) {
-			input_set_capability(tpacpi_inputdev, EV_KEY,
-						hotkey_keycode_map[i]);
-		}
-	}
+	res = sparse_keymap_setup(tpacpi_inputdev, keymap, NULL);
+	if (res)
+		return res;
 
 	if (tp_features.hotkey_wlsw) {
 		input_set_capability(tpacpi_inputdev, EV_SW, SW_RFKILL_ALL);
@@ -11739,7 +11626,6 @@ static void thinkpad_acpi_module_exit(void)
 			input_unregister_device(tpacpi_inputdev);
 		else
 			input_free_device(tpacpi_inputdev);
-		kfree(hotkey_keycode_map);
 	}
 
 	if (tpacpi_sensors_pdev)