Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1970 insertions, 0 deletions

diff --git a/drivers/input/keyboard/applespi.c b/drivers/input/keyboard/applespi.c
new file mode 100644
index 0000000000..cf25177b48
--- /dev/null
+++ b/drivers/input/keyboard/applespi.c
@@ -0,0 +1,1970 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MacBook (Pro) SPI keyboard and touchpad driver
+ *
+ * Copyright (c) 2015-2018 Federico Lorenzi
+ * Copyright (c) 2017-2018 Ronald Tschalär
+ */
+
+/*
+ * The keyboard and touchpad controller on the MacBookAir6, MacBookPro12,
+ * MacBook8 and newer can be driven either by USB or SPI. However the USB
+ * pins are only connected on the MacBookAir6 and 7 and the MacBookPro12.
+ * All others need this driver. The interface is selected using ACPI methods:
+ *
+ * * UIEN ("USB Interface Enable"): If invoked with argument 1, disables SPI
+ *   and enables USB. If invoked with argument 0, disables USB.
+ * * UIST ("USB Interface Status"): Returns 1 if USB is enabled, 0 otherwise.
+ * * SIEN ("SPI Interface Enable"): If invoked with argument 1, disables USB
+ *   and enables SPI. If invoked with argument 0, disables SPI.
+ * * SIST ("SPI Interface Status"): Returns 1 if SPI is enabled, 0 otherwise.
+ * * ISOL: Resets the four GPIO pins used for SPI. Intended to be invoked with
+ *   argument 1, then once more with argument 0.
+ *
+ * UIEN and UIST are only provided on models where the USB pins are connected.
+ *
+ * SPI-based Protocol
+ * ------------------
+ *
+ * The device and driver exchange messages (struct message); each message is
+ * encapsulated in one or more packets (struct spi_packet). There are two types
+ * of exchanges: reads, and writes. A read is signaled by a GPE, upon which one
+ * message can be read from the device. A write exchange consists of writing a
+ * command message, immediately reading a short status packet, and then, upon
+ * receiving a GPE, reading the response message. Write exchanges cannot be
+ * interleaved, i.e. a new write exchange must not be started till the previous
+ * write exchange is complete. Whether a received message is part of a read or
+ * write exchange is indicated in the encapsulating packet's flags field.
+ *
+ * A single message may be too large to fit in a single packet (which has a
+ * fixed, 256-byte size). In that case it will be split over multiple,
+ * consecutive packets.
+ */
+
+#include <linux/acpi.h>
+#include <linux/crc16.h>
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/efi.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/ktime.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/spi/spi.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include <asm/barrier.h>
+#include <asm/unaligned.h>
+
+#define CREATE_TRACE_POINTS
+#include "applespi.h"
+#include "applespi_trace.h"
+
+#define APPLESPI_PACKET_SIZE	256
+#define APPLESPI_STATUS_SIZE	4
+
+#define PACKET_TYPE_READ	0x20
+#define PACKET_TYPE_WRITE	0x40
+#define PACKET_DEV_KEYB		0x01
+#define PACKET_DEV_TPAD		0x02
+#define PACKET_DEV_INFO		0xd0
+
+#define MAX_ROLLOVER		6
+
+#define MAX_FINGERS		11
+#define MAX_FINGER_ORIENTATION	16384
+#define MAX_PKTS_PER_MSG	2
+
+#define KBD_BL_LEVEL_MIN	32U
+#define KBD_BL_LEVEL_MAX	255U
+#define KBD_BL_LEVEL_SCALE	1000000U
+#define KBD_BL_LEVEL_ADJ	\
+	((KBD_BL_LEVEL_MAX - KBD_BL_LEVEL_MIN) * KBD_BL_LEVEL_SCALE / 255U)
+
+#define EFI_BL_LEVEL_NAME	L"KeyboardBacklightLevel"
+#define EFI_BL_LEVEL_GUID	EFI_GUID(0xa076d2af, 0x9678, 0x4386, 0x8b, 0x58, 0x1f, 0xc8, 0xef, 0x04, 0x16, 0x19)
+
+#define APPLE_FLAG_FKEY		0x01
+
+#define SPI_RW_CHG_DELAY_US	100	/* from experimentation, in µs */
+
+#define SYNAPTICS_VENDOR_ID	0x06cb
+
+static unsigned int fnmode = 1;
+module_param(fnmode, uint, 0644);
+MODULE_PARM_DESC(fnmode, "Mode of Fn key on Apple keyboards (0 = disabled, [1] = fkeyslast, 2 = fkeysfirst)");
+
+static unsigned int fnremap;
+module_param(fnremap, uint, 0644);
+MODULE_PARM_DESC(fnremap, "Remap Fn key ([0] = no-remap; 1 = left-ctrl, 2 = left-shift, 3 = left-alt, 4 = left-meta, 6 = right-shift, 7 = right-alt, 8 = right-meta)");
+
+static bool iso_layout;
+module_param(iso_layout, bool, 0644);
+MODULE_PARM_DESC(iso_layout, "Enable/Disable hardcoded ISO-layout of the keyboard. ([0] = disabled, 1 = enabled)");
+
+static char touchpad_dimensions[40];
+module_param_string(touchpad_dimensions, touchpad_dimensions,
+		    sizeof(touchpad_dimensions), 0444);
+MODULE_PARM_DESC(touchpad_dimensions, "The pixel dimensions of the touchpad, as XxY+W+H .");
+
+/**
+ * struct keyboard_protocol - keyboard message.
+ * message.type = 0x0110, message.length = 0x000a
+ *
+ * @unknown1:		unknown
+ * @modifiers:		bit-set of modifier/control keys pressed
+ * @unknown2:		unknown
+ * @keys_pressed:	the (non-modifier) keys currently pressed
+ * @fn_pressed:		whether the fn key is currently pressed
+ * @crc16:		crc over the whole message struct (message header +
+ *			this struct) minus this @crc16 field
+ */
+struct keyboard_protocol {
+	u8			unknown1;
+	u8			modifiers;
+	u8			unknown2;
+	u8			keys_pressed[MAX_ROLLOVER];
+	u8			fn_pressed;
+	__le16			crc16;
+};
+
+/**
+ * struct tp_finger - single trackpad finger structure, le16-aligned
+ *
+ * @origin:		zero when switching track finger
+ * @abs_x:		absolute x coordinate
+ * @abs_y:		absolute y coordinate
+ * @rel_x:		relative x coordinate
+ * @rel_y:		relative y coordinate
+ * @tool_major:		tool area, major axis
+ * @tool_minor:		tool area, minor axis
+ * @orientation:	16384 when point, else 15 bit angle
+ * @touch_major:	touch area, major axis
+ * @touch_minor:	touch area, minor axis
+ * @unused:		zeros
+ * @pressure:		pressure on forcetouch touchpad
+ * @multi:		one finger: varies, more fingers: constant
+ * @crc16:		on last finger: crc over the whole message struct
+ *			(i.e. message header + this struct) minus the last
+ *			@crc16 field; unknown on all other fingers.
+ */
+struct tp_finger {
+	__le16 origin;
+	__le16 abs_x;
+	__le16 abs_y;
+	__le16 rel_x;
+	__le16 rel_y;
+	__le16 tool_major;
+	__le16 tool_minor;
+	__le16 orientation;
+	__le16 touch_major;
+	__le16 touch_minor;
+	__le16 unused[2];
+	__le16 pressure;
+	__le16 multi;
+	__le16 crc16;
+};
+
+/**
+ * struct touchpad_protocol - touchpad message.
+ * message.type = 0x0210
+ *
+ * @unknown1:		unknown
+ * @clicked:		1 if a button-click was detected, 0 otherwise
+ * @unknown2:		unknown
+ * @number_of_fingers:	the number of fingers being reported in @fingers
+ * @clicked2:		same as @clicked
+ * @unknown3:		unknown
+ * @fingers:		the data for each finger
+ */
+struct touchpad_protocol {
+	u8			unknown1[1];
+	u8			clicked;
+	u8			unknown2[28];
+	u8			number_of_fingers;
+	u8			clicked2;
+	u8			unknown3[16];
+	struct tp_finger	fingers[];
+};
+
+/**
+ * struct command_protocol_tp_info - get touchpad info.
+ * message.type = 0x1020, message.length = 0x0000
+ *
+ * @crc16:		crc over the whole message struct (message header +
+ *			this struct) minus this @crc16 field
+ */
+struct command_protocol_tp_info {
+	__le16			crc16;
+};
+
+/**
+ * struct touchpad_info_protocol - touchpad info response.
+ * message.type = 0x1020, message.length = 0x006e
+ *
+ * @unknown1:		unknown
+ * @model_flags:	flags (vary by model number, but significance otherwise
+ *			unknown)
+ * @model_no:		the touchpad model number
+ * @unknown2:		unknown
+ * @crc16:		crc over the whole message struct (message header +
+ *			this struct) minus this @crc16 field
+ */
+struct touchpad_info_protocol {
+	u8			unknown1[105];
+	u8			model_flags;
+	u8			model_no;
+	u8			unknown2[3];
+	__le16			crc16;
+};
+
+/**
+ * struct command_protocol_mt_init - initialize multitouch.
+ * message.type = 0x0252, message.length = 0x0002
+ *
+ * @cmd:		value: 0x0102
+ * @crc16:		crc over the whole message struct (message header +
+ *			this struct) minus this @crc16 field
+ */
+struct command_protocol_mt_init {
+	__le16			cmd;
+	__le16			crc16;
+};
+
+/**
+ * struct command_protocol_capsl - toggle caps-lock led
+ * message.type = 0x0151, message.length = 0x0002
+ *
+ * @unknown:		value: 0x01 (length?)
+ * @led:		0 off, 2 on
+ * @crc16:		crc over the whole message struct (message header +
+ *			this struct) minus this @crc16 field
+ */
+struct command_protocol_capsl {
+	u8			unknown;
+	u8			led;
+	__le16			crc16;
+};
+
+/**
+ * struct command_protocol_bl - set keyboard backlight brightness
+ * message.type = 0xB051, message.length = 0x0006
+ *
+ * @const1:		value: 0x01B0
+ * @level:		the brightness level to set
+ * @const2:		value: 0x0001 (backlight off), 0x01F4 (backlight on)
+ * @crc16:		crc over the whole message struct (message header +
+ *			this struct) minus this @crc16 field
+ */
+struct command_protocol_bl {
+	__le16			const1;
+	__le16			level;
+	__le16			const2;
+	__le16			crc16;
+};
+
+/**
+ * struct message - a complete spi message.
+ *
+ * Each message begins with fixed header, followed by a message-type specific
+ * payload, and ends with a 16-bit crc. Because of the varying lengths of the
+ * payload, the crc is defined at the end of each payload struct, rather than
+ * in this struct.
+ *
+ * @type:	the message type
+ * @zero:	always 0
+ * @counter:	incremented on each message, rolls over after 255; there is a
+ *		separate counter for each message type.
+ * @rsp_buf_len:response buffer length (the exact nature of this field is quite
+ *		speculative). On a request/write this is often the same as
+ *		@length, though in some cases it has been seen to be much larger
+ *		(e.g. 0x400); on a response/read this the same as on the
+ *		request; for reads that are not responses it is 0.
+ * @length:	length of the remainder of the data in the whole message
+ *		structure (after re-assembly in case of being split over
+ *		multiple spi-packets), minus the trailing crc. The total size
+ *		of the message struct is therefore @length + 10.
+ *
+ * @keyboard:		Keyboard message
+ * @touchpad:		Touchpad message
+ * @tp_info:		Touchpad info (response)
+ * @tp_info_command:	Touchpad info (CRC)
+ * @init_mt_command:	Initialise Multitouch
+ * @capsl_command:	Toggle caps-lock LED
+ * @bl_command:		Keyboard brightness
+ * @data:		Buffer data
+ */
+struct message {
+	__le16		type;
+	u8		zero;
+	u8		counter;
+	__le16		rsp_buf_len;
+	__le16		length;
+	union {
+		struct keyboard_protocol	keyboard;
+		struct touchpad_protocol	touchpad;
+		struct touchpad_info_protocol	tp_info;
+		struct command_protocol_tp_info	tp_info_command;
+		struct command_protocol_mt_init	init_mt_command;
+		struct command_protocol_capsl	capsl_command;
+		struct command_protocol_bl	bl_command;
+		DECLARE_FLEX_ARRAY(u8, 		data);
+	};
+};
+
+/* type + zero + counter + rsp_buf_len + length */
+#define MSG_HEADER_SIZE		8
+
+/**
+ * struct spi_packet - a complete spi packet; always 256 bytes. This carries
+ * the (parts of the) message in the data. But note that this does not
+ * necessarily contain a complete message, as in some cases (e.g. many
+ * fingers pressed) the message is split over multiple packets (see the
+ * @offset, @remaining, and @length fields). In general the data parts in
+ * spi_packet's are concatenated until @remaining is 0, and the result is an
+ * message.
+ *
+ * @flags:	0x40 = write (to device), 0x20 = read (from device); note that
+ *		the response to a write still has 0x40.
+ * @device:	1 = keyboard, 2 = touchpad
+ * @offset:	specifies the offset of this packet's data in the complete
+ *		message; i.e. > 0 indicates this is a continuation packet (in
+ *		the second packet for a message split over multiple packets
+ *		this would then be the same as the @length in the first packet)
+ * @remaining:	number of message bytes remaining in subsequents packets (in
+ *		the first packet of a message split over two packets this would
+ *		then be the same as the @length in the second packet)
+ * @length:	length of the valid data in the @data in this packet
+ * @data:	all or part of a message
+ * @crc16:	crc over this whole structure minus this @crc16 field. This
+ *		covers just this packet, even on multi-packet messages (in
+ *		contrast to the crc in the message).
+ */
+struct spi_packet {
+	u8			flags;
+	u8			device;
+	__le16			offset;
+	__le16			remaining;
+	__le16			length;
+	u8			data[246];
+	__le16			crc16;
+};
+
+struct spi_settings {
+	u64	spi_cs_delay;		/* cs-to-clk delay in us */
+	u64	reset_a2r_usec;		/* active-to-receive delay? */
+	u64	reset_rec_usec;		/* ? (cur val: 10) */
+};
+
+/* this mimics struct drm_rect */
+struct applespi_tp_info {
+	int	x_min;
+	int	y_min;
+	int	x_max;
+	int	y_max;
+};
+
+struct applespi_data {
+	struct spi_device		*spi;
+	struct spi_settings		spi_settings;
+	struct input_dev		*keyboard_input_dev;
+	struct input_dev		*touchpad_input_dev;
+
+	u8				*tx_buffer;
+	u8				*tx_status;
+	u8				*rx_buffer;
+
+	u8				*msg_buf;
+	unsigned int			saved_msg_len;
+
+	struct applespi_tp_info		tp_info;
+
+	u8				last_keys_pressed[MAX_ROLLOVER];
+	u8				last_keys_fn_pressed[MAX_ROLLOVER];
+	u8				last_fn_pressed;
+	struct input_mt_pos		pos[MAX_FINGERS];
+	int				slots[MAX_FINGERS];
+	int				gpe;
+	acpi_handle			sien;
+	acpi_handle			sist;
+
+	struct spi_transfer		dl_t;
+	struct spi_transfer		rd_t;
+	struct spi_message		rd_m;
+
+	struct spi_transfer		ww_t;
+	struct spi_transfer		wd_t;
+	struct spi_transfer		wr_t;
+	struct spi_transfer		st_t;
+	struct spi_message		wr_m;
+
+	bool				want_tp_info_cmd;
+	bool				want_mt_init_cmd;
+	bool				want_cl_led_on;
+	bool				have_cl_led_on;
+	unsigned int			want_bl_level;
+	unsigned int			have_bl_level;
+	unsigned int			cmd_msg_cntr;
+	/* lock to protect the above parameters and flags below */
+	spinlock_t			cmd_msg_lock;
+	ktime_t				cmd_msg_queued;
+	enum applespi_evt_type		cmd_evt_type;
+
+	struct led_classdev		backlight_info;
+
+	bool				suspended;
+	bool				drain;
+	wait_queue_head_t		drain_complete;
+	bool				read_active;
+	bool				write_active;
+
+	struct work_struct		work;
+	struct touchpad_info_protocol	rcvd_tp_info;
+
+	struct dentry			*debugfs_root;
+	bool				debug_tp_dim;
+	char				tp_dim_val[40];
+	int				tp_dim_min_x;
+	int				tp_dim_max_x;
+	int				tp_dim_min_y;
+	int				tp_dim_max_y;
+};
+
+static const unsigned char applespi_scancodes[] = {
+	0, 0, 0, 0,
+	KEY_A, KEY_B, KEY_C, KEY_D, KEY_E, KEY_F, KEY_G, KEY_H, KEY_I, KEY_J,
+	KEY_K, KEY_L, KEY_M, KEY_N, KEY_O, KEY_P, KEY_Q, KEY_R, KEY_S, KEY_T,
+	KEY_U, KEY_V, KEY_W, KEY_X, KEY_Y, KEY_Z,
+	KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, KEY_6, KEY_7, KEY_8, KEY_9, KEY_0,
+	KEY_ENTER, KEY_ESC, KEY_BACKSPACE, KEY_TAB, KEY_SPACE, KEY_MINUS,
+	KEY_EQUAL, KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, 0,
+	KEY_SEMICOLON, KEY_APOSTROPHE, KEY_GRAVE, KEY_COMMA, KEY_DOT, KEY_SLASH,
+	KEY_CAPSLOCK,
+	KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7, KEY_F8, KEY_F9,
+	KEY_F10, KEY_F11, KEY_F12, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	KEY_RIGHT, KEY_LEFT, KEY_DOWN, KEY_UP,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_102ND,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RO, 0, KEY_YEN, 0, 0, 0, 0, 0,
+	0, KEY_KATAKANAHIRAGANA, KEY_MUHENKAN
+};
+
+/*
+ * This must have exactly as many entries as there are bits in
+ * struct keyboard_protocol.modifiers .
+ */
+static const unsigned char applespi_controlcodes[] = {
+	KEY_LEFTCTRL,
+	KEY_LEFTSHIFT,
+	KEY_LEFTALT,
+	KEY_LEFTMETA,
+	0,
+	KEY_RIGHTSHIFT,
+	KEY_RIGHTALT,
+	KEY_RIGHTMETA
+};
+
+struct applespi_key_translation {
+	u16 from;
+	u16 to;
+	u8 flags;
+};
+
+static const struct applespi_key_translation applespi_fn_codes[] = {
+	{ KEY_BACKSPACE, KEY_DELETE },
+	{ KEY_ENTER,	KEY_INSERT },
+	{ KEY_F1,	KEY_BRIGHTNESSDOWN,	APPLE_FLAG_FKEY },
+	{ KEY_F2,	KEY_BRIGHTNESSUP,	APPLE_FLAG_FKEY },
+	{ KEY_F3,	KEY_SCALE,		APPLE_FLAG_FKEY },
+	{ KEY_F4,	KEY_DASHBOARD,		APPLE_FLAG_FKEY },
+	{ KEY_F5,	KEY_KBDILLUMDOWN,	APPLE_FLAG_FKEY },
+	{ KEY_F6,	KEY_KBDILLUMUP,		APPLE_FLAG_FKEY },
+	{ KEY_F7,	KEY_PREVIOUSSONG,	APPLE_FLAG_FKEY },
+	{ KEY_F8,	KEY_PLAYPAUSE,		APPLE_FLAG_FKEY },
+	{ KEY_F9,	KEY_NEXTSONG,		APPLE_FLAG_FKEY },
+	{ KEY_F10,	KEY_MUTE,		APPLE_FLAG_FKEY },
+	{ KEY_F11,	KEY_VOLUMEDOWN,		APPLE_FLAG_FKEY },
+	{ KEY_F12,	KEY_VOLUMEUP,		APPLE_FLAG_FKEY },
+	{ KEY_RIGHT,	KEY_END },
+	{ KEY_LEFT,	KEY_HOME },
+	{ KEY_DOWN,	KEY_PAGEDOWN },
+	{ KEY_UP,	KEY_PAGEUP },
+	{ }
+};
+
+static const struct applespi_key_translation apple_iso_keyboard[] = {
+	{ KEY_GRAVE,	KEY_102ND },
+	{ KEY_102ND,	KEY_GRAVE },
+	{ }
+};
+
+struct applespi_tp_model_info {
+	u16			model;
+	struct applespi_tp_info	tp_info;
+};
+
+static const struct applespi_tp_model_info applespi_tp_models[] = {
+	{
+		.model = 0x04,	/* MB8 MB9 MB10 */
+		.tp_info = { -5087, -182, 5579, 6089 },
+	},
+	{
+		.model = 0x05,	/* MBP13,1 MBP13,2 MBP14,1 MBP14,2 */
+		.tp_info = { -6243, -170, 6749, 7685 },
+	},
+	{
+		.model = 0x06,	/* MBP13,3 MBP14,3 */
+		.tp_info = { -7456, -163, 7976, 9283 },
+	},
+	{}
+};
+
+typedef void (*applespi_trace_fun)(enum applespi_evt_type,
+				   enum applespi_pkt_type, u8 *, size_t);
+
+static applespi_trace_fun applespi_get_trace_fun(enum applespi_evt_type type)
+{
+	switch (type) {
+	case ET_CMD_TP_INI:
+		return trace_applespi_tp_ini_cmd;
+	case ET_CMD_BL:
+		return trace_applespi_backlight_cmd;
+	case ET_CMD_CL:
+		return trace_applespi_caps_lock_cmd;
+	case ET_RD_KEYB:
+		return trace_applespi_keyboard_data;
+	case ET_RD_TPAD:
+		return trace_applespi_touchpad_data;
+	case ET_RD_UNKN:
+		return trace_applespi_unknown_data;
+	default:
+		WARN_ONCE(1, "Unknown msg type %d", type);
+		return trace_applespi_unknown_data;
+	}
+}
+
+static void applespi_setup_read_txfrs(struct applespi_data *applespi)
+{
+	struct spi_message *msg = &applespi->rd_m;
+	struct spi_transfer *dl_t = &applespi->dl_t;
+	struct spi_transfer *rd_t = &applespi->rd_t;
+
+	memset(dl_t, 0, sizeof(*dl_t));
+	memset(rd_t, 0, sizeof(*rd_t));
+
+	dl_t->delay.value = applespi->spi_settings.spi_cs_delay;
+	dl_t->delay.unit = SPI_DELAY_UNIT_USECS;
+
+	rd_t->rx_buf = applespi->rx_buffer;
+	rd_t->len = APPLESPI_PACKET_SIZE;
+
+	spi_message_init(msg);
+	spi_message_add_tail(dl_t, msg);
+	spi_message_add_tail(rd_t, msg);
+}
+
+static void applespi_setup_write_txfrs(struct applespi_data *applespi)
+{
+	struct spi_message *msg = &applespi->wr_m;
+	struct spi_transfer *wt_t = &applespi->ww_t;
+	struct spi_transfer *dl_t = &applespi->wd_t;
+	struct spi_transfer *wr_t = &applespi->wr_t;
+	struct spi_transfer *st_t = &applespi->st_t;
+
+	memset(wt_t, 0, sizeof(*wt_t));
+	memset(dl_t, 0, sizeof(*dl_t));
+	memset(wr_t, 0, sizeof(*wr_t));
+	memset(st_t, 0, sizeof(*st_t));
+
+	/*
+	 * All we need here is a delay at the beginning of the message before
+	 * asserting cs. But the current spi API doesn't support this, so we
+	 * end up with an extra unnecessary (but harmless) cs assertion and
+	 * deassertion.
+	 */
+	wt_t->delay.value = SPI_RW_CHG_DELAY_US;
+	wt_t->delay.unit = SPI_DELAY_UNIT_USECS;
+	wt_t->cs_change = 1;
+
+	dl_t->delay.value = applespi->spi_settings.spi_cs_delay;
+	dl_t->delay.unit = SPI_DELAY_UNIT_USECS;
+
+	wr_t->tx_buf = applespi->tx_buffer;
+	wr_t->len = APPLESPI_PACKET_SIZE;
+	wr_t->delay.value = SPI_RW_CHG_DELAY_US;
+	wr_t->delay.unit = SPI_DELAY_UNIT_USECS;
+
+	st_t->rx_buf = applespi->tx_status;
+	st_t->len = APPLESPI_STATUS_SIZE;
+
+	spi_message_init(msg);
+	spi_message_add_tail(wt_t, msg);
+	spi_message_add_tail(dl_t, msg);
+	spi_message_add_tail(wr_t, msg);
+	spi_message_add_tail(st_t, msg);
+}
+
+static int applespi_async(struct applespi_data *applespi,
+			  struct spi_message *message, void (*complete)(void *))
+{
+	message->complete = complete;
+	message->context = applespi;
+
+	return spi_async(applespi->spi, message);
+}
+
+static inline bool applespi_check_write_status(struct applespi_data *applespi,
+					       int sts)
+{
+	static u8 status_ok[] = { 0xac, 0x27, 0x68, 0xd5 };
+
+	if (sts < 0) {
+		dev_warn(&applespi->spi->dev, "Error writing to device: %d\n",
+			 sts);
+		return false;
+	}
+
+	if (memcmp(applespi->tx_status, status_ok, APPLESPI_STATUS_SIZE)) {
+		dev_warn(&applespi->spi->dev, "Error writing to device: %*ph\n",
+			 APPLESPI_STATUS_SIZE, applespi->tx_status);
+		return false;
+	}
+
+	return true;
+}
+
+static int applespi_get_spi_settings(struct applespi_data *applespi)
+{
+	struct acpi_device *adev = ACPI_COMPANION(&applespi->spi->dev);
+	const union acpi_object *o;
+	struct spi_settings *settings = &applespi->spi_settings;
+
+	if (!acpi_dev_get_property(adev, "spiCSDelay", ACPI_TYPE_BUFFER, &o))
+		settings->spi_cs_delay = *(u64 *)o->buffer.pointer;
+	else
+		dev_warn(&applespi->spi->dev,
+			 "Property spiCSDelay not found\n");
+
+	if (!acpi_dev_get_property(adev, "resetA2RUsec", ACPI_TYPE_BUFFER, &o))
+		settings->reset_a2r_usec = *(u64 *)o->buffer.pointer;
+	else
+		dev_warn(&applespi->spi->dev,
+			 "Property resetA2RUsec not found\n");
+
+	if (!acpi_dev_get_property(adev, "resetRecUsec", ACPI_TYPE_BUFFER, &o))
+		settings->reset_rec_usec = *(u64 *)o->buffer.pointer;
+	else
+		dev_warn(&applespi->spi->dev,
+			 "Property resetRecUsec not found\n");
+
+	dev_dbg(&applespi->spi->dev,
+		"SPI settings: spi_cs_delay=%llu reset_a2r_usec=%llu reset_rec_usec=%llu\n",
+		settings->spi_cs_delay, settings->reset_a2r_usec,
+		settings->reset_rec_usec);
+
+	return 0;
+}
+
+static int applespi_setup_spi(struct applespi_data *applespi)
+{
+	int sts;
+
+	sts = applespi_get_spi_settings(applespi);
+	if (sts)
+		return sts;
+
+	spin_lock_init(&applespi->cmd_msg_lock);
+	init_waitqueue_head(&applespi->drain_complete);
+
+	return 0;
+}
+
+static int applespi_enable_spi(struct applespi_data *applespi)
+{
+	acpi_status acpi_sts;
+	unsigned long long spi_status;
+
+	/* check if SPI is already enabled, so we can skip the delay below */
+	acpi_sts = acpi_evaluate_integer(applespi->sist, NULL, NULL,
+					 &spi_status);
+	if (ACPI_SUCCESS(acpi_sts) && spi_status)
+		return 0;
+
+	/* SIEN(1) will enable SPI communication */
+	acpi_sts = acpi_execute_simple_method(applespi->sien, NULL, 1);
+	if (ACPI_FAILURE(acpi_sts)) {
+		dev_err(&applespi->spi->dev, "SIEN failed: %s\n",
+			acpi_format_exception(acpi_sts));
+		return -ENODEV;
+	}
+
+	/*
+	 * Allow the SPI interface to come up before returning. Without this
+	 * delay, the SPI commands to enable multitouch mode may not reach
+	 * the trackpad controller, causing pointer movement to break upon
+	 * resume from sleep.
+	 */
+	msleep(50);
+
+	return 0;
+}
+
+static int applespi_send_cmd_msg(struct applespi_data *applespi);
+
+static void applespi_msg_complete(struct applespi_data *applespi,
+				  bool is_write_msg, bool is_read_compl)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);
+
+	if (is_read_compl)
+		applespi->read_active = false;
+	if (is_write_msg)
+		applespi->write_active = false;
+
+	if (applespi->drain && !applespi->write_active)
+		wake_up_all(&applespi->drain_complete);
+
+	if (is_write_msg) {
+		applespi->cmd_msg_queued = 0;
+		applespi_send_cmd_msg(applespi);
+	}
+
+	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
+}
+
+static void applespi_async_write_complete(void *context)
+{
+	struct applespi_data *applespi = context;
+	enum applespi_evt_type evt_type = applespi->cmd_evt_type;
+
+	applespi_get_trace_fun(evt_type)(evt_type, PT_WRITE,
+					 applespi->tx_buffer,
+					 APPLESPI_PACKET_SIZE);
+	applespi_get_trace_fun(evt_type)(evt_type, PT_STATUS,
+					 applespi->tx_status,
+					 APPLESPI_STATUS_SIZE);
+
+	udelay(SPI_RW_CHG_DELAY_US);
+
+	if (!applespi_check_write_status(applespi, applespi->wr_m.status)) {
+		/*
+		 * If we got an error, we presumably won't get the expected
+		 * response message either.
+		 */
+		applespi_msg_complete(applespi, true, false);
+	}
+}
+
+static int applespi_send_cmd_msg(struct applespi_data *applespi)
+{
+	u16 crc;
+	int sts;
+	struct spi_packet *packet = (struct spi_packet *)applespi->tx_buffer;
+	struct message *message = (struct message *)packet->data;
+	u16 msg_len;
+	u8 device;
+
+	/* check if draining */
+	if (applespi->drain)
+		return 0;
+
+	/* check whether send is in progress */
+	if (applespi->cmd_msg_queued) {
+		if (ktime_ms_delta(ktime_get(), applespi->cmd_msg_queued) < 1000)
+			return 0;
+
+		dev_warn(&applespi->spi->dev, "Command %d timed out\n",
+			 applespi->cmd_evt_type);
+
+		applespi->cmd_msg_queued = 0;
+		applespi->write_active = false;
+	}
+
+	/* set up packet */
+	memset(packet, 0, APPLESPI_PACKET_SIZE);
+
+	/* are we processing init commands? */
+	if (applespi->want_tp_info_cmd) {
+		applespi->want_tp_info_cmd = false;
+		applespi->want_mt_init_cmd = true;
+		applespi->cmd_evt_type = ET_CMD_TP_INI;
+
+		/* build init command */
+		device = PACKET_DEV_INFO;
+
+		message->type = cpu_to_le16(0x1020);
+		msg_len = sizeof(message->tp_info_command);
+
+		message->zero = 0x02;
+		message->rsp_buf_len = cpu_to_le16(0x0200);
+
+	} else if (applespi->want_mt_init_cmd) {
+		applespi->want_mt_init_cmd = false;
+		applespi->cmd_evt_type = ET_CMD_TP_INI;
+
+		/* build init command */
+		device = PACKET_DEV_TPAD;
+
+		message->type = cpu_to_le16(0x0252);
+		msg_len = sizeof(message->init_mt_command);
+
+		message->init_mt_command.cmd = cpu_to_le16(0x0102);
+
+	/* do we need caps-lock command? */
+	} else if (applespi->want_cl_led_on != applespi->have_cl_led_on) {
+		applespi->have_cl_led_on = applespi->want_cl_led_on;
+		applespi->cmd_evt_type = ET_CMD_CL;
+
+		/* build led command */
+		device = PACKET_DEV_KEYB;
+
+		message->type = cpu_to_le16(0x0151);
+		msg_len = sizeof(message->capsl_command);
+
+		message->capsl_command.unknown = 0x01;
+		message->capsl_command.led = applespi->have_cl_led_on ? 2 : 0;
+
+	/* do we need backlight command? */
+	} else if (applespi->want_bl_level != applespi->have_bl_level) {
+		applespi->have_bl_level = applespi->want_bl_level;
+		applespi->cmd_evt_type = ET_CMD_BL;
+
+		/* build command buffer */
+		device = PACKET_DEV_KEYB;
+
+		message->type = cpu_to_le16(0xB051);
+		msg_len = sizeof(message->bl_command);
+
+		message->bl_command.const1 = cpu_to_le16(0x01B0);
+		message->bl_command.level =
+				cpu_to_le16(applespi->have_bl_level);
+
+		if (applespi->have_bl_level > 0)
+			message->bl_command.const2 = cpu_to_le16(0x01F4);
+		else
+			message->bl_command.const2 = cpu_to_le16(0x0001);
+
+	/* everything's up-to-date */
+	} else {
+		return 0;
+	}
+
+	/* finalize packet */
+	packet->flags = PACKET_TYPE_WRITE;
+	packet->device = device;
+	packet->length = cpu_to_le16(MSG_HEADER_SIZE + msg_len);
+
+	message->counter = applespi->cmd_msg_cntr++ % (U8_MAX + 1);
+
+	message->length = cpu_to_le16(msg_len - 2);
+	if (!message->rsp_buf_len)
+		message->rsp_buf_len = message->length;
+
+	crc = crc16(0, (u8 *)message, le16_to_cpu(packet->length) - 2);
+	put_unaligned_le16(crc, &message->data[msg_len - 2]);
+
+	crc = crc16(0, (u8 *)packet, sizeof(*packet) - 2);
+	packet->crc16 = cpu_to_le16(crc);
+
+	/* send command */
+	sts = applespi_async(applespi, &applespi->wr_m,
+			     applespi_async_write_complete);
+	if (sts) {
+		dev_warn(&applespi->spi->dev,
+			 "Error queueing async write to device: %d\n", sts);
+		return sts;
+	}
+
+	applespi->cmd_msg_queued = ktime_get_coarse();
+	applespi->write_active = true;
+
+	return 0;
+}
+
+static void applespi_init(struct applespi_data *applespi, bool is_resume)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);
+
+	if (is_resume)
+		applespi->want_mt_init_cmd = true;
+	else
+		applespi->want_tp_info_cmd = true;
+	applespi_send_cmd_msg(applespi);
+
+	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
+}
+
+static int applespi_set_capsl_led(struct applespi_data *applespi,
+				  bool capslock_on)
+{
+	unsigned long flags;
+	int sts;
+
+	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);
+
+	applespi->want_cl_led_on = capslock_on;
+	sts = applespi_send_cmd_msg(applespi);
+
+	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
+
+	return sts;
+}
+
+static void applespi_set_bl_level(struct led_classdev *led_cdev,
+				  enum led_brightness value)
+{
+	struct applespi_data *applespi =
+		container_of(led_cdev, struct applespi_data, backlight_info);
+	unsigned long flags;
+
+	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);
+
+	if (value == 0) {
+		applespi->want_bl_level = value;
+	} else {
+		/*
+		 * The backlight does not turn on till level 32, so we scale
+		 * the range here so that from a user's perspective it turns
+		 * on at 1.
+		 */
+		applespi->want_bl_level =
+			((value * KBD_BL_LEVEL_ADJ) / KBD_BL_LEVEL_SCALE +
+			 KBD_BL_LEVEL_MIN);
+	}
+
+	applespi_send_cmd_msg(applespi);
+
+	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
+}
+
+static int applespi_event(struct input_dev *dev, unsigned int type,
+			  unsigned int code, int value)
+{
+	struct applespi_data *applespi = input_get_drvdata(dev);
+
+	switch (type) {
+	case EV_LED:
+		applespi_set_capsl_led(applespi, !!test_bit(LED_CAPSL, dev->led));
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+/* lifted from the BCM5974 driver and renamed from raw2int */
+/* convert 16-bit little endian to signed integer */
+static inline int le16_to_int(__le16 x)
+{
+	return (signed short)le16_to_cpu(x);
+}
+
+static void applespi_debug_update_dimensions(struct applespi_data *applespi,
+					     const struct tp_finger *f)
+{
+	applespi->tp_dim_min_x = min(applespi->tp_dim_min_x,
+				     le16_to_int(f->abs_x));
+	applespi->tp_dim_max_x = max(applespi->tp_dim_max_x,
+				     le16_to_int(f->abs_x));
+	applespi->tp_dim_min_y = min(applespi->tp_dim_min_y,
+				     le16_to_int(f->abs_y));
+	applespi->tp_dim_max_y = max(applespi->tp_dim_max_y,
+				     le16_to_int(f->abs_y));
+}
+
+static int applespi_tp_dim_open(struct inode *inode, struct file *file)
+{
+	struct applespi_data *applespi = inode->i_private;
+
+	file->private_data = applespi;
+
+	snprintf(applespi->tp_dim_val, sizeof(applespi->tp_dim_val),
+		 "0x%.4x %dx%d+%u+%u\n",
+		 applespi->touchpad_input_dev->id.product,
+		 applespi->tp_dim_min_x, applespi->tp_dim_min_y,
+		 applespi->tp_dim_max_x - applespi->tp_dim_min_x,
+		 applespi->tp_dim_max_y - applespi->tp_dim_min_y);
+
+	return nonseekable_open(inode, file);
+}
+
+static ssize_t applespi_tp_dim_read(struct file *file, char __user *buf,
+				    size_t len, loff_t *off)
+{
+	struct applespi_data *applespi = file->private_data;
+
+	return simple_read_from_buffer(buf, len, off, applespi->tp_dim_val,
+				       strlen(applespi->tp_dim_val));
+}
+
+static const struct file_operations applespi_tp_dim_fops = {
+	.owner = THIS_MODULE,
+	.open = applespi_tp_dim_open,
+	.read = applespi_tp_dim_read,
+	.llseek = no_llseek,
+};
+
+static void report_finger_data(struct input_dev *input, int slot,
+			       const struct input_mt_pos *pos,
+			       const struct tp_finger *f)
+{
+	input_mt_slot(input, slot);
+	input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+
+	input_report_abs(input, ABS_MT_TOUCH_MAJOR,
+			 le16_to_int(f->touch_major) << 1);
+	input_report_abs(input, ABS_MT_TOUCH_MINOR,
+			 le16_to_int(f->touch_minor) << 1);
+	input_report_abs(input, ABS_MT_WIDTH_MAJOR,
+			 le16_to_int(f->tool_major) << 1);
+	input_report_abs(input, ABS_MT_WIDTH_MINOR,
+			 le16_to_int(f->tool_minor) << 1);
+	input_report_abs(input, ABS_MT_ORIENTATION,
+			 MAX_FINGER_ORIENTATION - le16_to_int(f->orientation));
+	input_report_abs(input, ABS_MT_POSITION_X, pos->x);
+	input_report_abs(input, ABS_MT_POSITION_Y, pos->y);
+}
+
+static void report_tp_state(struct applespi_data *applespi,
+			    struct touchpad_protocol *t)
+{
+	const struct tp_finger *f;
+	struct input_dev *input;
+	const struct applespi_tp_info *tp_info = &applespi->tp_info;
+	int i, n;
+
+	/* touchpad_input_dev is set async in worker */
+	input = smp_load_acquire(&applespi->touchpad_input_dev);
+	if (!input)
+		return;	/* touchpad isn't initialized yet */
+
+	n = 0;
+
+	for (i = 0; i < t->number_of_fingers; i++) {
+		f = &t->fingers[i];
+		if (le16_to_int(f->touch_major) == 0)
+			continue;
+		applespi->pos[n].x = le16_to_int(f->abs_x);
+		applespi->pos[n].y = tp_info->y_min + tp_info->y_max -
+				     le16_to_int(f->abs_y);
+		n++;
+
+		if (applespi->debug_tp_dim)
+			applespi_debug_update_dimensions(applespi, f);
+	}
+
+	input_mt_assign_slots(input, applespi->slots, applespi->pos, n, 0);
+
+	for (i = 0; i < n; i++)
+		report_finger_data(input, applespi->slots[i],
+				   &applespi->pos[i], &t->fingers[i]);
+
+	input_mt_sync_frame(input);
+	input_report_key(input, BTN_LEFT, t->clicked);
+
+	input_sync(input);
+}
+
+static const struct applespi_key_translation *
+applespi_find_translation(const struct applespi_key_translation *table, u16 key)
+{
+	const struct applespi_key_translation *trans;
+
+	for (trans = table; trans->from; trans++)
+		if (trans->from == key)
+			return trans;
+
+	return NULL;
+}
+
+static unsigned int applespi_translate_fn_key(unsigned int key, int fn_pressed)
+{
+	const struct applespi_key_translation *trans;
+	int do_translate;
+
+	trans = applespi_find_translation(applespi_fn_codes, key);
+	if (trans) {
+		if (trans->flags & APPLE_FLAG_FKEY)
+			do_translate = (fnmode == 2 && fn_pressed) ||
+				       (fnmode == 1 && !fn_pressed);
+		else
+			do_translate = fn_pressed;
+
+		if (do_translate)
+			key = trans->to;
+	}
+
+	return key;
+}
+
+static unsigned int applespi_translate_iso_layout(unsigned int key)
+{
+	const struct applespi_key_translation *trans;
+
+	trans = applespi_find_translation(apple_iso_keyboard, key);
+	if (trans)
+		key = trans->to;
+
+	return key;
+}
+
+static unsigned int applespi_code_to_key(u8 code, int fn_pressed)
+{
+	unsigned int key = applespi_scancodes[code];
+
+	if (fnmode)
+		key = applespi_translate_fn_key(key, fn_pressed);
+	if (iso_layout)
+		key = applespi_translate_iso_layout(key);
+	return key;
+}
+
+static void
+applespi_remap_fn_key(struct keyboard_protocol *keyboard_protocol)
+{
+	unsigned char tmp;
+	u8 bit = BIT((fnremap - 1) & 0x07);
+
+	if (!fnremap || fnremap > ARRAY_SIZE(applespi_controlcodes) ||
+	    !applespi_controlcodes[fnremap - 1])
+		return;
+
+	tmp = keyboard_protocol->fn_pressed;
+	keyboard_protocol->fn_pressed = !!(keyboard_protocol->modifiers & bit);
+	if (tmp)
+		keyboard_protocol->modifiers |= bit;
+	else
+		keyboard_protocol->modifiers &= ~bit;
+}
+
+static void
+applespi_handle_keyboard_event(struct applespi_data *applespi,
+			       struct keyboard_protocol *keyboard_protocol)
+{
+	unsigned int key;
+	int i;
+
+	compiletime_assert(ARRAY_SIZE(applespi_controlcodes) ==
+			   sizeof_field(struct keyboard_protocol, modifiers) * 8,
+			   "applespi_controlcodes has wrong number of entries");
+
+	/* check for rollover overflow, which is signalled by all keys == 1 */
+	if (!memchr_inv(keyboard_protocol->keys_pressed, 1, MAX_ROLLOVER))
+		return;
+
+	/* remap fn key if desired */
+	applespi_remap_fn_key(keyboard_protocol);
+
+	/* check released keys */
+	for (i = 0; i < MAX_ROLLOVER; i++) {
+		if (memchr(keyboard_protocol->keys_pressed,
+			   applespi->last_keys_pressed[i], MAX_ROLLOVER))
+			continue;	/* key is still pressed */
+
+		key = applespi_code_to_key(applespi->last_keys_pressed[i],
+					   applespi->last_keys_fn_pressed[i]);
+		input_report_key(applespi->keyboard_input_dev, key, 0);
+		applespi->last_keys_fn_pressed[i] = 0;
+	}
+
+	/* check pressed keys */
+	for (i = 0; i < MAX_ROLLOVER; i++) {
+		if (keyboard_protocol->keys_pressed[i] <
+				ARRAY_SIZE(applespi_scancodes) &&
+		    keyboard_protocol->keys_pressed[i] > 0) {
+			key = applespi_code_to_key(
+					keyboard_protocol->keys_pressed[i],
+					keyboard_protocol->fn_pressed);
+			input_report_key(applespi->keyboard_input_dev, key, 1);
+			applespi->last_keys_fn_pressed[i] =
+					keyboard_protocol->fn_pressed;
+		}
+	}
+
+	/* check control keys */
+	for (i = 0; i < ARRAY_SIZE(applespi_controlcodes); i++) {
+		if (keyboard_protocol->modifiers & BIT(i))
+			input_report_key(applespi->keyboard_input_dev,
+					 applespi_controlcodes[i], 1);
+		else
+			input_report_key(applespi->keyboard_input_dev,
+					 applespi_controlcodes[i], 0);
+	}
+
+	/* check function key */
+	if (keyboard_protocol->fn_pressed && !applespi->last_fn_pressed)
+		input_report_key(applespi->keyboard_input_dev, KEY_FN, 1);
+	else if (!keyboard_protocol->fn_pressed && applespi->last_fn_pressed)
+		input_report_key(applespi->keyboard_input_dev, KEY_FN, 0);
+	applespi->last_fn_pressed = keyboard_protocol->fn_pressed;
+
+	/* done */
+	input_sync(applespi->keyboard_input_dev);
+	memcpy(&applespi->last_keys_pressed, keyboard_protocol->keys_pressed,
+	       sizeof(applespi->last_keys_pressed));
+}
+
+static const struct applespi_tp_info *applespi_find_touchpad_info(u8 model)
+{
+	const struct applespi_tp_model_info *info;
+
+	for (info = applespi_tp_models; info->model; info++) {
+		if (info->model == model)
+			return &info->tp_info;
+	}
+
+	return NULL;
+}
+
+static int
+applespi_register_touchpad_device(struct applespi_data *applespi,
+				  struct touchpad_info_protocol *rcvd_tp_info)
+{
+	const struct applespi_tp_info *tp_info;
+	struct input_dev *touchpad_input_dev;
+	int sts;
+
+	/* set up touchpad dimensions */
+	tp_info = applespi_find_touchpad_info(rcvd_tp_info->model_no);
+	if (!tp_info) {
+		dev_warn(&applespi->spi->dev,
+			 "Unknown touchpad model %x - falling back to MB8 touchpad\n",
+			 rcvd_tp_info->model_no);
+		tp_info = &applespi_tp_models[0].tp_info;
+	}
+
+	applespi->tp_info = *tp_info;
+
+	if (touchpad_dimensions[0]) {
+		int x, y, w, h;
+
+		sts = sscanf(touchpad_dimensions, "%dx%d+%u+%u", &x, &y, &w, &h);
+		if (sts == 4) {
+			dev_info(&applespi->spi->dev,
+				 "Overriding touchpad dimensions from module param\n");
+			applespi->tp_info.x_min = x;
+			applespi->tp_info.y_min = y;
+			applespi->tp_info.x_max = x + w;
+			applespi->tp_info.y_max = y + h;
+		} else {
+			dev_warn(&applespi->spi->dev,
+				 "Invalid touchpad dimensions '%s': must be in the form XxY+W+H\n",
+				 touchpad_dimensions);
+			touchpad_dimensions[0] = '\0';
+		}
+	}
+	if (!touchpad_dimensions[0]) {
+		snprintf(touchpad_dimensions, sizeof(touchpad_dimensions),
+			 "%dx%d+%u+%u",
+			 applespi->tp_info.x_min,
+			 applespi->tp_info.y_min,
+			 applespi->tp_info.x_max - applespi->tp_info.x_min,
+			 applespi->tp_info.y_max - applespi->tp_info.y_min);
+	}
+
+	/* create touchpad input device */
+	touchpad_input_dev = devm_input_allocate_device(&applespi->spi->dev);
+	if (!touchpad_input_dev) {
+		dev_err(&applespi->spi->dev,
+			"Failed to allocate touchpad input device\n");
+		return -ENOMEM;
+	}
+
+	touchpad_input_dev->name = "Apple SPI Touchpad";
+	touchpad_input_dev->phys = "applespi/input1";
+	touchpad_input_dev->dev.parent = &applespi->spi->dev;
+	touchpad_input_dev->id.bustype = BUS_SPI;
+	touchpad_input_dev->id.vendor = SYNAPTICS_VENDOR_ID;
+	touchpad_input_dev->id.product =
+			rcvd_tp_info->model_no << 8 | rcvd_tp_info->model_flags;
+
+	/* basic properties */
+	input_set_capability(touchpad_input_dev, EV_REL, REL_X);
+	input_set_capability(touchpad_input_dev, EV_REL, REL_Y);
+
+	__set_bit(INPUT_PROP_POINTER, touchpad_input_dev->propbit);
+	__set_bit(INPUT_PROP_BUTTONPAD, touchpad_input_dev->propbit);
+
+	/* finger touch area */
+	input_set_abs_params(touchpad_input_dev, ABS_MT_TOUCH_MAJOR,
+			     0, 5000, 0, 0);
+	input_set_abs_params(touchpad_input_dev, ABS_MT_TOUCH_MINOR,
+			     0, 5000, 0, 0);
+
+	/* finger approach area */
+	input_set_abs_params(touchpad_input_dev, ABS_MT_WIDTH_MAJOR,
+			     0, 5000, 0, 0);
+	input_set_abs_params(touchpad_input_dev, ABS_MT_WIDTH_MINOR,
+			     0, 5000, 0, 0);
+
+	/* finger orientation */
+	input_set_abs_params(touchpad_input_dev, ABS_MT_ORIENTATION,
+			     -MAX_FINGER_ORIENTATION, MAX_FINGER_ORIENTATION,
+			     0, 0);
+
+	/* finger position */
+	input_set_abs_params(touchpad_input_dev, ABS_MT_POSITION_X,
+			     applespi->tp_info.x_min, applespi->tp_info.x_max,
+			     0, 0);
+	input_set_abs_params(touchpad_input_dev, ABS_MT_POSITION_Y,
+			     applespi->tp_info.y_min, applespi->tp_info.y_max,
+			     0, 0);
+
+	/* touchpad button */
+	input_set_capability(touchpad_input_dev, EV_KEY, BTN_LEFT);
+
+	/* multitouch */
+	sts = input_mt_init_slots(touchpad_input_dev, MAX_FINGERS,
+				  INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
+					INPUT_MT_TRACK);
+	if (sts) {
+		dev_err(&applespi->spi->dev,
+			"failed to initialize slots: %d", sts);
+		return sts;
+	}
+
+	/* register input device */
+	sts = input_register_device(touchpad_input_dev);
+	if (sts) {
+		dev_err(&applespi->spi->dev,
+			"Unable to register touchpad input device (%d)\n", sts);
+		return sts;
+	}
+
+	/* touchpad_input_dev is read async in spi callback */
+	smp_store_release(&applespi->touchpad_input_dev, touchpad_input_dev);
+
+	return 0;
+}
+
+static void applespi_worker(struct work_struct *work)
+{
+	struct applespi_data *applespi =
+		container_of(work, struct applespi_data, work);
+
+	applespi_register_touchpad_device(applespi, &applespi->rcvd_tp_info);
+}
+
+static void applespi_handle_cmd_response(struct applespi_data *applespi,
+					 struct spi_packet *packet,
+					 struct message *message)
+{
+	if (packet->device == PACKET_DEV_INFO &&
+	    le16_to_cpu(message->type) == 0x1020) {
+		/*
+		 * We're not allowed to sleep here, but registering an input
+		 * device can sleep.
+		 */
+		applespi->rcvd_tp_info = message->tp_info;
+		schedule_work(&applespi->work);
+		return;
+	}
+
+	if (le16_to_cpu(message->length) != 0x0000) {
+		dev_warn_ratelimited(&applespi->spi->dev,
+				     "Received unexpected write response: length=%x\n",
+				     le16_to_cpu(message->length));
+		return;
+	}
+
+	if (packet->device == PACKET_DEV_TPAD &&
+	    le16_to_cpu(message->type) == 0x0252 &&
+	    le16_to_cpu(message->rsp_buf_len) == 0x0002)
+		dev_info(&applespi->spi->dev, "modeswitch done.\n");
+}
+
+static bool applespi_verify_crc(struct applespi_data *applespi, u8 *buffer,
+				size_t buflen)
+{
+	u16 crc;
+
+	crc = crc16(0, buffer, buflen);
+	if (crc) {
+		dev_warn_ratelimited(&applespi->spi->dev,
+				     "Received corrupted packet (crc mismatch)\n");
+		trace_applespi_bad_crc(ET_RD_CRC, READ, buffer, buflen);
+
+		return false;
+	}
+
+	return true;
+}
+
+static void applespi_debug_print_read_packet(struct applespi_data *applespi,
+					     struct spi_packet *packet)
+{
+	unsigned int evt_type;
+
+	if (packet->flags == PACKET_TYPE_READ &&
+	    packet->device == PACKET_DEV_KEYB)
+		evt_type = ET_RD_KEYB;
+	else if (packet->flags == PACKET_TYPE_READ &&
+		 packet->device == PACKET_DEV_TPAD)
+		evt_type = ET_RD_TPAD;
+	else if (packet->flags == PACKET_TYPE_WRITE)
+		evt_type = applespi->cmd_evt_type;
+	else
+		evt_type = ET_RD_UNKN;
+
+	applespi_get_trace_fun(evt_type)(evt_type, PT_READ, applespi->rx_buffer,
+					 APPLESPI_PACKET_SIZE);
+}
+
+static void applespi_got_data(struct applespi_data *applespi)
+{
+	struct spi_packet *packet;
+	struct message *message;
+	unsigned int msg_len;
+	unsigned int off;
+	unsigned int rem;
+	unsigned int len;
+
+	/* process packet header */
+	if (!applespi_verify_crc(applespi, applespi->rx_buffer,
+				 APPLESPI_PACKET_SIZE)) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&applespi->cmd_msg_lock, flags);
+
+		if (applespi->drain) {
+			applespi->read_active = false;
+			applespi->write_active = false;
+
+			wake_up_all(&applespi->drain_complete);
+		}
+
+		spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
+
+		return;
+	}
+
+	packet = (struct spi_packet *)applespi->rx_buffer;
+
+	applespi_debug_print_read_packet(applespi, packet);
+
+	off = le16_to_cpu(packet->offset);
+	rem = le16_to_cpu(packet->remaining);
+	len = le16_to_cpu(packet->length);
+
+	if (len > sizeof(packet->data)) {
+		dev_warn_ratelimited(&applespi->spi->dev,
+				     "Received corrupted packet (invalid packet length %u)\n",
+				     len);
+		goto msg_complete;
+	}
+
+	/* handle multi-packet messages */
+	if (rem > 0 || off > 0) {
+		if (off != applespi->saved_msg_len) {
+			dev_warn_ratelimited(&applespi->spi->dev,
+					     "Received unexpected offset (got %u, expected %u)\n",
+					     off, applespi->saved_msg_len);
+			goto msg_complete;
+		}
+
+		if (off + rem > MAX_PKTS_PER_MSG * APPLESPI_PACKET_SIZE) {
+			dev_warn_ratelimited(&applespi->spi->dev,
+					     "Received message too large (size %u)\n",
+					     off + rem);
+			goto msg_complete;
+		}
+
+		if (off + len > MAX_PKTS_PER_MSG * APPLESPI_PACKET_SIZE) {
+			dev_warn_ratelimited(&applespi->spi->dev,
+					     "Received message too large (size %u)\n",
+					     off + len);
+			goto msg_complete;
+		}
+
+		memcpy(applespi->msg_buf + off, &packet->data, len);
+		applespi->saved_msg_len += len;
+
+		if (rem > 0)
+			return;
+
+		message = (struct message *)applespi->msg_buf;
+		msg_len = applespi->saved_msg_len;
+	} else {
+		message = (struct message *)&packet->data;
+		msg_len = len;
+	}
+
+	/* got complete message - verify */
+	if (!applespi_verify_crc(applespi, (u8 *)message, msg_len))
+		goto msg_complete;
+
+	if (le16_to_cpu(message->length) != msg_len - MSG_HEADER_SIZE - 2) {
+		dev_warn_ratelimited(&applespi->spi->dev,
+				     "Received corrupted packet (invalid message length %u - expected %u)\n",
+				     le16_to_cpu(message->length),
+				     msg_len - MSG_HEADER_SIZE - 2);
+		goto msg_complete;
+	}
+
+	/* handle message */
+	if (packet->flags == PACKET_TYPE_READ &&
+	    packet->device == PACKET_DEV_KEYB) {
+		applespi_handle_keyboard_event(applespi, &message->keyboard);
+
+	} else if (packet->flags == PACKET_TYPE_READ &&
+		   packet->device == PACKET_DEV_TPAD) {
+		struct touchpad_protocol *tp;
+		size_t tp_len;
+
+		tp = &message->touchpad;
+		tp_len = struct_size(tp, fingers, tp->number_of_fingers);
+
+		if (le16_to_cpu(message->length) + 2 != tp_len) {
+			dev_warn_ratelimited(&applespi->spi->dev,
+					     "Received corrupted packet (invalid message length %u - num-fingers %u, tp-len %zu)\n",
+					     le16_to_cpu(message->length),
+					     tp->number_of_fingers, tp_len);
+			goto msg_complete;
+		}
+
+		if (tp->number_of_fingers > MAX_FINGERS) {
+			dev_warn_ratelimited(&applespi->spi->dev,
+					     "Number of reported fingers (%u) exceeds max (%u))\n",
+					     tp->number_of_fingers,
+					     MAX_FINGERS);
+			tp->number_of_fingers = MAX_FINGERS;
+		}
+
+		report_tp_state(applespi, tp);
+
+	} else if (packet->flags == PACKET_TYPE_WRITE) {
+		applespi_handle_cmd_response(applespi, packet, message);
+	}
+
+msg_complete:
+	applespi->saved_msg_len = 0;
+
+	applespi_msg_complete(applespi, packet->flags == PACKET_TYPE_WRITE,
+			      true);
+}
+
+static void applespi_async_read_complete(void *context)
+{
+	struct applespi_data *applespi = context;
+
+	if (applespi->rd_m.status < 0) {
+		dev_warn(&applespi->spi->dev, "Error reading from device: %d\n",
+			 applespi->rd_m.status);
+		/*
+		 * We don't actually know if this was a pure read, or a response
+		 * to a write. But this is a rare error condition that should
+		 * never occur, so clearing both flags to avoid deadlock.
+		 */
+		applespi_msg_complete(applespi, true, true);
+	} else {
+		applespi_got_data(applespi);
+	}
+
+	acpi_finish_gpe(NULL, applespi->gpe);
+}
+
+static u32 applespi_notify(acpi_handle gpe_device, u32 gpe, void *context)
+{
+	struct applespi_data *applespi = context;
+	int sts;
+	unsigned long flags;
+
+	trace_applespi_irq_received(ET_RD_IRQ, PT_READ);
+
+	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);
+
+	if (!applespi->suspended) {
+		sts = applespi_async(applespi, &applespi->rd_m,
+				     applespi_async_read_complete);
+		if (sts)
+			dev_warn(&applespi->spi->dev,
+				 "Error queueing async read to device: %d\n",
+				 sts);
+		else
+			applespi->read_active = true;
+	}
+
+	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
+
+	return ACPI_INTERRUPT_HANDLED;
+}
+
+static int applespi_get_saved_bl_level(struct applespi_data *applespi)
+{
+	efi_status_t sts = EFI_NOT_FOUND;
+	u16 efi_data = 0;
+	unsigned long efi_data_len = sizeof(efi_data);
+
+	if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
+		sts = efi.get_variable(EFI_BL_LEVEL_NAME, &EFI_BL_LEVEL_GUID,
+				       NULL, &efi_data_len, &efi_data);
+	if (sts != EFI_SUCCESS && sts != EFI_NOT_FOUND)
+		dev_warn(&applespi->spi->dev,
+			 "Error getting backlight level from EFI vars: 0x%lx\n",
+			 sts);
+
+	return sts != EFI_SUCCESS ? -ENODEV : efi_data;
+}
+
+static void applespi_save_bl_level(struct applespi_data *applespi,
+				   unsigned int level)
+{
+	efi_status_t sts = EFI_UNSUPPORTED;
+	u32 efi_attr;
+	u16 efi_data;
+
+	efi_data = (u16)level;
+	efi_attr = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS |
+		   EFI_VARIABLE_RUNTIME_ACCESS;
+
+	if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE))
+		sts = efi.set_variable(EFI_BL_LEVEL_NAME, &EFI_BL_LEVEL_GUID,
+				       efi_attr, sizeof(efi_data), &efi_data);
+	if (sts != EFI_SUCCESS)
+		dev_warn(&applespi->spi->dev,
+			 "Error saving backlight level to EFI vars: 0x%lx\n", sts);
+}
+
+static int applespi_probe(struct spi_device *spi)
+{
+	struct applespi_data *applespi;
+	acpi_handle spi_handle = ACPI_HANDLE(&spi->dev);
+	acpi_status acpi_sts;
+	int sts, i;
+	unsigned long long gpe, usb_status;
+
+	/* check if the USB interface is present and enabled already */
+	acpi_sts = acpi_evaluate_integer(spi_handle, "UIST", NULL, &usb_status);
+	if (ACPI_SUCCESS(acpi_sts) && usb_status) {
+		/* let the USB driver take over instead */
+		dev_info(&spi->dev, "USB interface already enabled\n");
+		return -ENODEV;
+	}
+
+	/* allocate driver data */
+	applespi = devm_kzalloc(&spi->dev, sizeof(*applespi), GFP_KERNEL);
+	if (!applespi)
+		return -ENOMEM;
+
+	applespi->spi = spi;
+
+	INIT_WORK(&applespi->work, applespi_worker);
+
+	/* store the driver data */
+	spi_set_drvdata(spi, applespi);
+
+	/* create our buffers */
+	applespi->tx_buffer = devm_kmalloc(&spi->dev, APPLESPI_PACKET_SIZE,
+					   GFP_KERNEL);
+	applespi->tx_status = devm_kmalloc(&spi->dev, APPLESPI_STATUS_SIZE,
+					   GFP_KERNEL);
+	applespi->rx_buffer = devm_kmalloc(&spi->dev, APPLESPI_PACKET_SIZE,
+					   GFP_KERNEL);
+	applespi->msg_buf = devm_kmalloc_array(&spi->dev, MAX_PKTS_PER_MSG,
+					       APPLESPI_PACKET_SIZE,
+					       GFP_KERNEL);
+
+	if (!applespi->tx_buffer || !applespi->tx_status ||
+	    !applespi->rx_buffer || !applespi->msg_buf)
+		return -ENOMEM;
+
+	/* set up our spi messages */
+	applespi_setup_read_txfrs(applespi);
+	applespi_setup_write_txfrs(applespi);
+
+	/* cache ACPI method handles */
+	acpi_sts = acpi_get_handle(spi_handle, "SIEN", &applespi->sien);
+	if (ACPI_FAILURE(acpi_sts)) {
+		dev_err(&applespi->spi->dev,
+			"Failed to get SIEN ACPI method handle: %s\n",
+			acpi_format_exception(acpi_sts));
+		return -ENODEV;
+	}
+
+	acpi_sts = acpi_get_handle(spi_handle, "SIST", &applespi->sist);
+	if (ACPI_FAILURE(acpi_sts)) {
+		dev_err(&applespi->spi->dev,
+			"Failed to get SIST ACPI method handle: %s\n",
+			acpi_format_exception(acpi_sts));
+		return -ENODEV;
+	}
+
+	/* switch on the SPI interface */
+	sts = applespi_setup_spi(applespi);
+	if (sts)
+		return sts;
+
+	sts = applespi_enable_spi(applespi);
+	if (sts)
+		return sts;
+
+	/* setup the keyboard input dev */
+	applespi->keyboard_input_dev = devm_input_allocate_device(&spi->dev);
+
+	if (!applespi->keyboard_input_dev)
+		return -ENOMEM;
+
+	applespi->keyboard_input_dev->name = "Apple SPI Keyboard";
+	applespi->keyboard_input_dev->phys = "applespi/input0";
+	applespi->keyboard_input_dev->dev.parent = &spi->dev;
+	applespi->keyboard_input_dev->id.bustype = BUS_SPI;
+
+	applespi->keyboard_input_dev->evbit[0] =
+			BIT_MASK(EV_KEY) | BIT_MASK(EV_LED) | BIT_MASK(EV_REP);
+	applespi->keyboard_input_dev->ledbit[0] = BIT_MASK(LED_CAPSL);
+
+	input_set_drvdata(applespi->keyboard_input_dev, applespi);
+	applespi->keyboard_input_dev->event = applespi_event;
+
+	for (i = 0; i < ARRAY_SIZE(applespi_scancodes); i++)
+		if (applespi_scancodes[i])
+			input_set_capability(applespi->keyboard_input_dev,
+					     EV_KEY, applespi_scancodes[i]);
+
+	for (i = 0; i < ARRAY_SIZE(applespi_controlcodes); i++)
+		if (applespi_controlcodes[i])
+			input_set_capability(applespi->keyboard_input_dev,
+					     EV_KEY, applespi_controlcodes[i]);
+
+	for (i = 0; i < ARRAY_SIZE(applespi_fn_codes); i++)
+		if (applespi_fn_codes[i].to)
+			input_set_capability(applespi->keyboard_input_dev,
+					     EV_KEY, applespi_fn_codes[i].to);
+
+	input_set_capability(applespi->keyboard_input_dev, EV_KEY, KEY_FN);
+
+	sts = input_register_device(applespi->keyboard_input_dev);
+	if (sts) {
+		dev_err(&applespi->spi->dev,
+			"Unable to register keyboard input device (%d)\n", sts);
+		return -ENODEV;
+	}
+
+	/*
+	 * The applespi device doesn't send interrupts normally (as is described
+	 * in its DSDT), but rather seems to use ACPI GPEs.
+	 */
+	acpi_sts = acpi_evaluate_integer(spi_handle, "_GPE", NULL, &gpe);
+	if (ACPI_FAILURE(acpi_sts)) {
+		dev_err(&applespi->spi->dev,
+			"Failed to obtain GPE for SPI slave device: %s\n",
+			acpi_format_exception(acpi_sts));
+		return -ENODEV;
+	}
+	applespi->gpe = (int)gpe;
+
+	acpi_sts = acpi_install_gpe_handler(NULL, applespi->gpe,
+					    ACPI_GPE_LEVEL_TRIGGERED,
+					    applespi_notify, applespi);
+	if (ACPI_FAILURE(acpi_sts)) {
+		dev_err(&applespi->spi->dev,
+			"Failed to install GPE handler for GPE %d: %s\n",
+			applespi->gpe, acpi_format_exception(acpi_sts));
+		return -ENODEV;
+	}
+
+	applespi->suspended = false;
+
+	acpi_sts = acpi_enable_gpe(NULL, applespi->gpe);
+	if (ACPI_FAILURE(acpi_sts)) {
+		dev_err(&applespi->spi->dev,
+			"Failed to enable GPE handler for GPE %d: %s\n",
+			applespi->gpe, acpi_format_exception(acpi_sts));
+		acpi_remove_gpe_handler(NULL, applespi->gpe, applespi_notify);
+		return -ENODEV;
+	}
+
+	/* trigger touchpad setup */
+	applespi_init(applespi, false);
+
+	/*
+	 * By default this device is not enabled for wakeup; but USB keyboards
+	 * generally are, so the expectation is that by default the keyboard
+	 * will wake the system.
+	 */
+	device_wakeup_enable(&spi->dev);
+
+	/* set up keyboard-backlight */
+	sts = applespi_get_saved_bl_level(applespi);
+	if (sts >= 0)
+		applespi_set_bl_level(&applespi->backlight_info, sts);
+
+	applespi->backlight_info.name            = "spi::kbd_backlight";
+	applespi->backlight_info.default_trigger = "kbd-backlight";
+	applespi->backlight_info.brightness_set  = applespi_set_bl_level;
+
+	sts = devm_led_classdev_register(&spi->dev, &applespi->backlight_info);
+	if (sts)
+		dev_warn(&applespi->spi->dev,
+			 "Unable to register keyboard backlight class dev (%d)\n",
+			 sts);
+
+	/* set up debugfs entries for touchpad dimensions logging */
+	applespi->debugfs_root = debugfs_create_dir("applespi", NULL);
+
+	debugfs_create_bool("enable_tp_dim", 0600, applespi->debugfs_root,
+			    &applespi->debug_tp_dim);
+
+	debugfs_create_file("tp_dim", 0400, applespi->debugfs_root, applespi,
+			    &applespi_tp_dim_fops);
+
+	return 0;
+}
+
+static void applespi_drain_writes(struct applespi_data *applespi)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);
+
+	applespi->drain = true;
+	wait_event_lock_irq(applespi->drain_complete, !applespi->write_active,
+			    applespi->cmd_msg_lock);
+
+	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
+}
+
+static void applespi_drain_reads(struct applespi_data *applespi)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);
+
+	wait_event_lock_irq(applespi->drain_complete, !applespi->read_active,
+			    applespi->cmd_msg_lock);
+
+	applespi->suspended = true;
+
+	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
+}
+
+static void applespi_remove(struct spi_device *spi)
+{
+	struct applespi_data *applespi = spi_get_drvdata(spi);
+
+	applespi_drain_writes(applespi);
+
+	acpi_disable_gpe(NULL, applespi->gpe);
+	acpi_remove_gpe_handler(NULL, applespi->gpe, applespi_notify);
+	device_wakeup_disable(&spi->dev);
+
+	applespi_drain_reads(applespi);
+
+	debugfs_remove_recursive(applespi->debugfs_root);
+}
+
+static void applespi_shutdown(struct spi_device *spi)
+{
+	struct applespi_data *applespi = spi_get_drvdata(spi);
+
+	applespi_save_bl_level(applespi, applespi->have_bl_level);
+}
+
+static int applespi_poweroff_late(struct device *dev)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	struct applespi_data *applespi = spi_get_drvdata(spi);
+
+	applespi_save_bl_level(applespi, applespi->have_bl_level);
+
+	return 0;
+}
+
+static int applespi_suspend(struct device *dev)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	struct applespi_data *applespi = spi_get_drvdata(spi);
+	acpi_status acpi_sts;
+	int sts;
+
+	/* turn off caps-lock - it'll stay on otherwise */
+	sts = applespi_set_capsl_led(applespi, false);
+	if (sts)
+		dev_warn(&applespi->spi->dev,
+			 "Failed to turn off caps-lock led (%d)\n", sts);
+
+	applespi_drain_writes(applespi);
+
+	/* disable the interrupt */
+	acpi_sts = acpi_disable_gpe(NULL, applespi->gpe);
+	if (ACPI_FAILURE(acpi_sts))
+		dev_err(&applespi->spi->dev,
+			"Failed to disable GPE handler for GPE %d: %s\n",
+			applespi->gpe, acpi_format_exception(acpi_sts));
+
+	applespi_drain_reads(applespi);
+
+	return 0;
+}
+
+static int applespi_resume(struct device *dev)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	struct applespi_data *applespi = spi_get_drvdata(spi);
+	acpi_status acpi_sts;
+	unsigned long flags;
+
+	/* ensure our flags and state reflect a newly resumed device */
+	spin_lock_irqsave(&applespi->cmd_msg_lock, flags);
+
+	applespi->drain = false;
+	applespi->have_cl_led_on = false;
+	applespi->have_bl_level = 0;
+	applespi->cmd_msg_queued = 0;
+	applespi->read_active = false;
+	applespi->write_active = false;
+
+	applespi->suspended = false;
+
+	spin_unlock_irqrestore(&applespi->cmd_msg_lock, flags);
+
+	/* switch on the SPI interface */
+	applespi_enable_spi(applespi);
+
+	/* re-enable the interrupt */
+	acpi_sts = acpi_enable_gpe(NULL, applespi->gpe);
+	if (ACPI_FAILURE(acpi_sts))
+		dev_err(&applespi->spi->dev,
+			"Failed to re-enable GPE handler for GPE %d: %s\n",
+			applespi->gpe, acpi_format_exception(acpi_sts));
+
+	/* switch the touchpad into multitouch mode */
+	applespi_init(applespi, true);
+
+	return 0;
+}
+
+static const struct acpi_device_id applespi_acpi_match[] = {
+	{ "APP000D", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, applespi_acpi_match);
+
+static const struct dev_pm_ops applespi_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(applespi_suspend, applespi_resume)
+	.poweroff_late	= pm_sleep_ptr(applespi_poweroff_late),
+};
+
+static struct spi_driver applespi_driver = {
+	.driver		= {
+		.name			= "applespi",
+		.acpi_match_table	= applespi_acpi_match,
+		.pm			= pm_sleep_ptr(&applespi_pm_ops),
+	},
+	.probe		= applespi_probe,
+	.remove		= applespi_remove,
+	.shutdown	= applespi_shutdown,
+};
+
+module_spi_driver(applespi_driver)
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MacBook(Pro) SPI Keyboard/Touchpad driver");
+MODULE_AUTHOR("Federico Lorenzi");
+MODULE_AUTHOR("Ronald Tschalär");