17 files changed, 2467 insertions, 97 deletions

diff --git a/Documentation/devicetree/bindings/input/ps2keyb-mouse-apbps2.txt b/Documentation/devicetree/bindings/input/ps2keyb-mouse-apbps2.txt
new file mode 100644
index 0000000..3029c56
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/ps2keyb-mouse-apbps2.txt
@@ -0,0 +1,16 @@
+Aeroflex Gaisler APBPS2 PS/2 Core, supporting Keyboard or Mouse.
+
+The APBPS2 PS/2 core is available in the GRLIB VHDL IP core library.
+
+Note: In the ordinary environment for the APBPS2 core, a LEON SPARC system,
+these properties are built from information in the AMBA plug&play and from
+bootloader settings.
+
+Required properties:
+
+- name : Should be "GAISLER_APBPS2" or "01_060"
+- reg : Address and length of the register set for the device
+- interrupts : Interrupt numbers for this device
+
+For further information look in the documentation for the GLIB IP core library:
+http://www.gaisler.com/products/grlib/grip.pdf
diff --git a/Documentation/devicetree/bindings/input/touchscreen/auo_pixcir_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/auo_pixcir_ts.txt
new file mode 100644
index 0000000..f40f21c
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/auo_pixcir_ts.txt
@@ -0,0 +1,30 @@
+* AUO in-cell touchscreen controller using Pixcir sensors
+
+Required properties:
+- compatible: must be "auo,auo_pixcir_ts"
+- reg: I2C address of the chip
+- interrupts: interrupt to which the chip is connected
+- gpios: gpios the chip is connected to
+  first one is the interrupt gpio and second one the reset gpio
+- x-size: horizontal resolution of touchscreen
+- y-size: vertical resolution of touchscreen
+
+Example:
+
+	i2c@00000000 {
+		/* ... */
+
+		auo_pixcir_ts@5c {
+			compatible = "auo,auo_pixcir_ts";
+			reg = <0x5c>;
+			interrupts = <2 0>;
+
+			gpios = <&gpf 2 0 2>, /* INT */
+				<&gpf 5 1 0>; /* RST */
+
+			x-size = <800>;
+			y-size = <600>;
+		};
+
+		/* ... */
+	};
diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index 6683906..507379e 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -671,6 +671,80 @@ int devres_release_group(struct device *dev, void *id)
 EXPORT_SYMBOL_GPL(devres_release_group);
 
 /*
+ * Custom devres actions allow inserting a simple function call
+ * into the teadown sequence.
+ */
+
+struct action_devres {
+	void *data;
+	void (*action)(void *);
+};
+
+static int devm_action_match(struct device *dev, void *res, void *p)
+{
+	struct action_devres *devres = res;
+	struct action_devres *target = p;
+
+	return devres->action == target->action &&
+	       devres->data == target->data;
+}
+
+static void devm_action_release(struct device *dev, void *res)
+{
+	struct action_devres *devres = res;
+
+	devres->action(devres->data);
+}
+
+/**
+ * devm_add_action() - add a custom action to list of managed resources
+ * @dev: Device that owns the action
+ * @action: Function that should be called
+ * @data: Pointer to data passed to @action implementation
+ *
+ * This adds a custom action to the list of managed resources so that
+ * it gets executed as part of standard resource unwinding.
+ */
+int devm_add_action(struct device *dev, void (*action)(void *), void *data)
+{
+	struct action_devres *devres;
+
+	devres = devres_alloc(devm_action_release,
+			      sizeof(struct action_devres), GFP_KERNEL);
+	if (!devres)
+		return -ENOMEM;
+
+	devres->data = data;
+	devres->action = action;
+
+	devres_add(dev, devres);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_add_action);
+
+/**
+ * devm_remove_action() - removes previously added custom action
+ * @dev: Device that owns the action
+ * @action: Function implementing the action
+ * @data: Pointer to data passed to @action implementation
+ *
+ * Removes instance of @action previously added by devm_add_action().
+ * Both action and data should match one of the existing entries.
+ */
+void devm_remove_action(struct device *dev, void (*action)(void *), void *data)
+{
+	struct action_devres devres = {
+		.data = data,
+		.action = action,
+	};
+
+	WARN_ON(devres_destroy(dev, devm_action_release, devm_action_match,
+			       &devres));
+
+}
+EXPORT_SYMBOL_GPL(devm_remove_action);
+
+/*
  * Managed kzalloc/kfree
  */
 static void devm_kzalloc_release(struct device *dev, void *res)
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 259ef31..af80928 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -590,6 +590,16 @@ config INPUT_ADXL34X_SPI
 	  To compile this driver as a module, choose M here: the
 	  module will be called adxl34x-spi.
 
+config INPUT_IMS_PCU
+	tristate "IMS Passenger Control Unit driver"
+	depends on USB
+	depends on LEDS_CLASS
+	help
+	  Say Y here if you have system with IMS Rave Passenger Control Unit.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called ims_pcu.
+
 config INPUT_CMA3000
 	tristate "VTI CMA3000 Tri-axis accelerometer"
 	help
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 1f1e1b1..d7fc17f 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_INPUT_DM355EVM)		+= dm355evm_keys.o
 obj-$(CONFIG_INPUT_GP2A)		+= gp2ap002a00f.o
 obj-$(CONFIG_INPUT_GPIO_TILT_POLLED)	+= gpio_tilt_polled.o
 obj-$(CONFIG_HP_SDC_RTC)		+= hp_sdc_rtc.o
+obj-$(CONFIG_INPUT_IMS_PCU)		+= ims-pcu.o
 obj-$(CONFIG_INPUT_IXP4XX_BEEPER)	+= ixp4xx-beeper.o
 obj-$(CONFIG_INPUT_KEYSPAN_REMOTE)	+= keyspan_remote.o
 obj-$(CONFIG_INPUT_KXTJ9)		+= kxtj9.o
diff --git a/drivers/input/misc/ims-pcu.c b/drivers/input/misc/ims-pcu.c
new file mode 100644
index 0000000..1b044b9
--- /dev/null
+++ b/drivers/input/misc/ims-pcu.c
@@ -0,0 +1,1900 @@
+/*
+ * Driver for IMS Passenger Control Unit Devices
+ *
+ * Copyright (C) 2013 The IMS Company
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/firmware.h>
+#include <linux/ihex.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/usb/input.h>
+#include <linux/usb/cdc.h>
+#include <asm/unaligned.h>
+
+#define IMS_PCU_KEYMAP_LEN		32
+
+struct ims_pcu_buttons {
+	struct input_dev *input;
+	char name[32];
+	char phys[32];
+	unsigned short keymap[IMS_PCU_KEYMAP_LEN];
+};
+
+struct ims_pcu_gamepad {
+	struct input_dev *input;
+	char name[32];
+	char phys[32];
+};
+
+struct ims_pcu_backlight {
+	struct led_classdev cdev;
+	struct work_struct work;
+	enum led_brightness desired_brightness;
+	char name[32];
+};
+
+#define IMS_PCU_PART_NUMBER_LEN		15
+#define IMS_PCU_SERIAL_NUMBER_LEN	8
+#define IMS_PCU_DOM_LEN			8
+#define IMS_PCU_FW_VERSION_LEN		(9 + 1)
+#define IMS_PCU_BL_VERSION_LEN		(9 + 1)
+#define IMS_PCU_BL_RESET_REASON_LEN	(2 + 1)
+
+#define IMS_PCU_BUF_SIZE		128
+
+struct ims_pcu {
+	struct usb_device *udev;
+	struct device *dev; /* control interface's device, used for logging */
+
+	unsigned int device_no;
+
+	bool bootloader_mode;
+
+	char part_number[IMS_PCU_PART_NUMBER_LEN];
+	char serial_number[IMS_PCU_SERIAL_NUMBER_LEN];
+	char date_of_manufacturing[IMS_PCU_DOM_LEN];
+	char fw_version[IMS_PCU_FW_VERSION_LEN];
+	char bl_version[IMS_PCU_BL_VERSION_LEN];
+	char reset_reason[IMS_PCU_BL_RESET_REASON_LEN];
+	int update_firmware_status;
+
+	struct usb_interface *ctrl_intf;
+
+	struct usb_endpoint_descriptor *ep_ctrl;
+	struct urb *urb_ctrl;
+	u8 *urb_ctrl_buf;
+	dma_addr_t ctrl_dma;
+	size_t max_ctrl_size;
+
+	struct usb_interface *data_intf;
+
+	struct usb_endpoint_descriptor *ep_in;
+	struct urb *urb_in;
+	u8 *urb_in_buf;
+	dma_addr_t read_dma;
+	size_t max_in_size;
+
+	struct usb_endpoint_descriptor *ep_out;
+	u8 *urb_out_buf;
+	size_t max_out_size;
+
+	u8 read_buf[IMS_PCU_BUF_SIZE];
+	u8 read_pos;
+	u8 check_sum;
+	bool have_stx;
+	bool have_dle;
+
+	u8 cmd_buf[IMS_PCU_BUF_SIZE];
+	u8 ack_id;
+	u8 expected_response;
+	u8 cmd_buf_len;
+	struct completion cmd_done;
+	struct mutex cmd_mutex;
+
+	u32 fw_start_addr;
+	u32 fw_end_addr;
+	struct completion async_firmware_done;
+
+	struct ims_pcu_buttons buttons;
+	struct ims_pcu_gamepad *gamepad;
+	struct ims_pcu_backlight backlight;
+
+	bool setup_complete; /* Input and LED devices have been created */
+};
+
+
+/*********************************************************************
+ *             Buttons Input device support                          *
+ *********************************************************************/
+
+static const unsigned short ims_pcu_keymap_1[] = {
+	[1] = KEY_ATTENDANT_OFF,
+	[2] = KEY_ATTENDANT_ON,
+	[3] = KEY_LIGHTS_TOGGLE,
+	[4] = KEY_VOLUMEUP,
+	[5] = KEY_VOLUMEDOWN,
+	[6] = KEY_INFO,
+};
+
+static const unsigned short ims_pcu_keymap_2[] = {
+	[4] = KEY_VOLUMEUP,
+	[5] = KEY_VOLUMEDOWN,
+	[6] = KEY_INFO,
+};
+
+static const unsigned short ims_pcu_keymap_3[] = {
+	[1] = KEY_HOMEPAGE,
+	[2] = KEY_ATTENDANT_TOGGLE,
+	[3] = KEY_LIGHTS_TOGGLE,
+	[4] = KEY_VOLUMEUP,
+	[5] = KEY_VOLUMEDOWN,
+	[6] = KEY_DISPLAYTOGGLE,
+	[18] = KEY_PLAYPAUSE,
+};
+
+static const unsigned short ims_pcu_keymap_4[] = {
+	[1] = KEY_ATTENDANT_OFF,
+	[2] = KEY_ATTENDANT_ON,
+	[3] = KEY_LIGHTS_TOGGLE,
+	[4] = KEY_VOLUMEUP,
+	[5] = KEY_VOLUMEDOWN,
+	[6] = KEY_INFO,
+	[18] = KEY_PLAYPAUSE,
+};
+
+static const unsigned short ims_pcu_keymap_5[] = {
+	[1] = KEY_ATTENDANT_OFF,
+	[2] = KEY_ATTENDANT_ON,
+	[3] = KEY_LIGHTS_TOGGLE,
+};
+
+struct ims_pcu_device_info {
+	const unsigned short *keymap;
+	size_t keymap_len;
+	bool has_gamepad;
+};
+
+#define IMS_PCU_DEVINFO(_n, _gamepad)				\
+	[_n] = {						\
+		.keymap = ims_pcu_keymap_##_n,			\
+		.keymap_len = ARRAY_SIZE(ims_pcu_keymap_##_n),	\
+		.has_gamepad = _gamepad,			\
+	}
+
+static const struct ims_pcu_device_info ims_pcu_device_info[] = {
+	IMS_PCU_DEVINFO(1, true),
+	IMS_PCU_DEVINFO(2, true),
+	IMS_PCU_DEVINFO(3, true),
+	IMS_PCU_DEVINFO(4, true),
+	IMS_PCU_DEVINFO(5, false),
+};
+
+static void ims_pcu_buttons_report(struct ims_pcu *pcu, u32 data)
+{
+	struct ims_pcu_buttons *buttons = &pcu->buttons;
+	struct input_dev *input = buttons->input;
+	int i;
+
+	for (i = 0; i < 32; i++) {
+		unsigned short keycode = buttons->keymap[i];
+
+		if (keycode != KEY_RESERVED)
+			input_report_key(input, keycode, data & (1UL << i));
+	}
+
+	input_sync(input);
+}
+
+static int ims_pcu_setup_buttons(struct ims_pcu *pcu,
+				 const unsigned short *keymap,
+				 size_t keymap_len)
+{
+	struct ims_pcu_buttons *buttons = &pcu->buttons;
+	struct input_dev *input;
+	int i;
+	int error;
+
+	input = input_allocate_device();
+	if (!input) {
+		dev_err(pcu->dev,
+			"Not enough memory for input input device\n");
+		return -ENOMEM;
+	}
+
+	snprintf(buttons->name, sizeof(buttons->name),
+		 "IMS PCU#%d Button Interface", pcu->device_no);
+
+	usb_make_path(pcu->udev, buttons->phys, sizeof(buttons->phys));
+	strlcat(buttons->phys, "/input0", sizeof(buttons->phys));
+
+	memcpy(buttons->keymap, keymap, sizeof(*keymap) * keymap_len);
+
+	input->name = buttons->name;
+	input->phys = buttons->phys;
+	usb_to_input_id(pcu->udev, &input->id);
+	input->dev.parent = &pcu->ctrl_intf->dev;
+
+	input->keycode = buttons->keymap;
+	input->keycodemax = ARRAY_SIZE(buttons->keymap);
+	input->keycodesize = sizeof(buttons->keymap[0]);
+
+	__set_bit(EV_KEY, input->evbit);
+	for (i = 0; i < IMS_PCU_KEYMAP_LEN; i++)
+		__set_bit(buttons->keymap[i], input->keybit);
+	__clear_bit(KEY_RESERVED, input->keybit);
+
+	error = input_register_device(input);
+	if (error) {
+		dev_err(pcu->dev,
+			"Failed to register buttons input device: %d\n",
+			error);
+		input_free_device(input);
+		return error;
+	}
+
+	buttons->input = input;
+	return 0;
+}
+
+static void ims_pcu_destroy_buttons(struct ims_pcu *pcu)
+{
+	struct ims_pcu_buttons *buttons = &pcu->buttons;
+
+	input_unregister_device(buttons->input);
+}
+
+
+/*********************************************************************
+ *             Gamepad Input device support                          *
+ *********************************************************************/
+
+static void ims_pcu_gamepad_report(struct ims_pcu *pcu, u32 data)
+{
+	struct ims_pcu_gamepad *gamepad = pcu->gamepad;
+	struct input_dev *input = gamepad->input;
+	int x, y;
+
+	x = !!(data & (1 << 14)) - !!(data & (1 << 13));
+	y = !!(data & (1 << 12)) - !!(data & (1 << 11));
+
+	input_report_abs(input, ABS_X, x);
+	input_report_abs(input, ABS_Y, y);
+
+	input_report_key(input, BTN_A, data & (1 << 7));
+	input_report_key(input, BTN_B, data & (1 << 8));
+	input_report_key(input, BTN_X, data & (1 << 9));
+	input_report_key(input, BTN_Y, data & (1 << 10));
+	input_report_key(input, BTN_START, data & (1 << 15));
+	input_report_key(input, BTN_SELECT, data & (1 << 16));
+
+	input_sync(input);
+}
+
+static int ims_pcu_setup_gamepad(struct ims_pcu *pcu)
+{
+	struct ims_pcu_gamepad *gamepad;
+	struct input_dev *input;
+	int error;
+
+	gamepad = kzalloc(sizeof(struct ims_pcu_gamepad), GFP_KERNEL);
+	input = input_allocate_device();
+	if (!gamepad || !input) {
+		dev_err(pcu->dev,
+			"Not enough memory for gamepad device\n");
+		return -ENOMEM;
+	}
+
+	gamepad->input = input;
+
+	snprintf(gamepad->name, sizeof(gamepad->name),
+		 "IMS PCU#%d Gamepad Interface", pcu->device_no);
+
+	usb_make_path(pcu->udev, gamepad->phys, sizeof(gamepad->phys));
+	strlcat(gamepad->phys, "/input1", sizeof(gamepad->phys));
+
+	input->name = gamepad->name;
+	input->phys = gamepad->phys;
+	usb_to_input_id(pcu->udev, &input->id);
+	input->dev.parent = &pcu->ctrl_intf->dev;
+
+	__set_bit(EV_KEY, input->evbit);
+	__set_bit(BTN_A, input->keybit);
+	__set_bit(BTN_B, input->keybit);
+	__set_bit(BTN_X, input->keybit);
+	__set_bit(BTN_Y, input->keybit);
+	__set_bit(BTN_START, input->keybit);
+	__set_bit(BTN_SELECT, input->keybit);
+
+	__set_bit(EV_ABS, input->evbit);
+	input_set_abs_params(input, ABS_X, -1, 1, 0, 0);
+	input_set_abs_params(input, ABS_Y, -1, 1, 0, 0);
+
+	error = input_register_device(input);
+	if (error) {
+		dev_err(pcu->dev,
+			"Failed to register gamepad input device: %d\n",
+			error);
+		goto err_free_mem;
+	}
+
+	pcu->gamepad = gamepad;
+	return 0;
+
+err_free_mem:
+	input_free_device(input);
+	kfree(gamepad);
+	return -ENOMEM;
+}
+
+static void ims_pcu_destroy_gamepad(struct ims_pcu *pcu)
+{
+	struct ims_pcu_gamepad *gamepad = pcu->gamepad;
+
+	input_unregister_device(gamepad->input);
+	kfree(gamepad);
+}
+
+
+/*********************************************************************
+ *             PCU Communication protocol handling                   *
+ *********************************************************************/
+
+#define IMS_PCU_PROTOCOL_STX		0x02
+#define IMS_PCU_PROTOCOL_ETX		0x03
+#define IMS_PCU_PROTOCOL_DLE		0x10
+
+/* PCU commands */
+#define IMS_PCU_CMD_STATUS		0xa0
+#define IMS_PCU_CMD_PCU_RESET		0xa1
+#define IMS_PCU_CMD_RESET_REASON	0xa2
+#define IMS_PCU_CMD_SEND_BUTTONS	0xa3
+#define IMS_PCU_CMD_JUMP_TO_BTLDR	0xa4
+#define IMS_PCU_CMD_GET_INFO		0xa5
+#define IMS_PCU_CMD_SET_BRIGHTNESS	0xa6
+#define IMS_PCU_CMD_EEPROM		0xa7
+#define IMS_PCU_CMD_GET_FW_VERSION	0xa8
+#define IMS_PCU_CMD_GET_BL_VERSION	0xa9
+#define IMS_PCU_CMD_SET_INFO		0xab
+#define IMS_PCU_CMD_GET_BRIGHTNESS	0xac
+#define IMS_PCU_CMD_GET_DEVICE_ID	0xae
+#define IMS_PCU_CMD_SPECIAL_INFO	0xb0
+#define IMS_PCU_CMD_BOOTLOADER		0xb1	/* Pass data to bootloader */
+
+/* PCU responses */
+#define IMS_PCU_RSP_STATUS		0xc0
+#define IMS_PCU_RSP_PCU_RESET		0	/* Originally 0xc1 */
+#define IMS_PCU_RSP_RESET_REASON	0xc2
+#define IMS_PCU_RSP_SEND_BUTTONS	0xc3
+#define IMS_PCU_RSP_JUMP_TO_BTLDR	0	/* Originally 0xc4 */
+#define IMS_PCU_RSP_GET_INFO		0xc5
+#define IMS_PCU_RSP_SET_BRIGHTNESS	0xc6
+#define IMS_PCU_RSP_EEPROM		0xc7
+#define IMS_PCU_RSP_GET_FW_VERSION	0xc8
+#define IMS_PCU_RSP_GET_BL_VERSION	0xc9
+#define IMS_PCU_RSP_SET_INFO		0xcb
+#define IMS_PCU_RSP_GET_BRIGHTNESS	0xcc
+#define IMS_PCU_RSP_CMD_INVALID		0xcd
+#define IMS_PCU_RSP_GET_DEVICE_ID	0xce
+#define IMS_PCU_RSP_SPECIAL_INFO	0xd0
+#define IMS_PCU_RSP_BOOTLOADER		0xd1	/* Bootloader response */
+
+#define IMS_PCU_RSP_EVNT_BUTTONS	0xe0	/* Unsolicited, button state */
+#define IMS_PCU_GAMEPAD_MASK		0x0001ff80UL	/* Bits 7 through 16 */
+
+
+#define IMS_PCU_MIN_PACKET_LEN		3
+#define IMS_PCU_DATA_OFFSET		2
+
+#define IMS_PCU_CMD_WRITE_TIMEOUT	100 /* msec */
+#define IMS_PCU_CMD_RESPONSE_TIMEOUT	500 /* msec */
+
+static void ims_pcu_report_events(struct ims_pcu *pcu)
+{
+	u32 data = get_unaligned_be32(&pcu->read_buf[3]);
+
+	ims_pcu_buttons_report(pcu, data & ~IMS_PCU_GAMEPAD_MASK);
+	if (pcu->gamepad)
+		ims_pcu_gamepad_report(pcu, data);
+}
+
+static void ims_pcu_handle_response(struct ims_pcu *pcu)
+{
+	switch (pcu->read_buf[0]) {
+	case IMS_PCU_RSP_EVNT_BUTTONS:
+		if (likely(pcu->setup_complete))
+			ims_pcu_report_events(pcu);
+		break;
+
+	default:
+		/*
+		 * See if we got command completion.
+		 * If both the sequence and response code match save
+		 * the data and signal completion.
+		 */
+		if (pcu->read_buf[0] == pcu->expected_response &&
+		    pcu->read_buf[1] == pcu->ack_id - 1) {
+
+			memcpy(pcu->cmd_buf, pcu->read_buf, pcu->read_pos);
+			pcu->cmd_buf_len = pcu->read_pos;
+			complete(&pcu->cmd_done);
+		}
+		break;
+	}
+}
+
+static void ims_pcu_process_data(struct ims_pcu *pcu, struct urb *urb)
+{
+	int i;
+
+	for (i = 0; i < urb->actual_length; i++) {
+		u8 data = pcu->urb_in_buf[i];
+
+		/* Skip everything until we get Start Xmit */
+		if (!pcu->have_stx && data != IMS_PCU_PROTOCOL_STX)
+			continue;
+
+		if (pcu->have_dle) {
+			pcu->have_dle = false;
+			pcu->read_buf[pcu->read_pos++] = data;
+			pcu->check_sum += data;
+			continue;
+		}
+
+		switch (data) {
+		case IMS_PCU_PROTOCOL_STX:
+			if (pcu->have_stx)
+				dev_warn(pcu->dev,
+					 "Unexpected STX at byte %d, discarding old data\n",
+					 pcu->read_pos);
+			pcu->have_stx = true;
+			pcu->have_dle = false;
+			pcu->read_pos = 0;
+			pcu->check_sum = 0;
+			break;
+
+		case IMS_PCU_PROTOCOL_DLE:
+			pcu->have_dle = true;
+			break;
+
+		case IMS_PCU_PROTOCOL_ETX:
+			if (pcu->read_pos < IMS_PCU_MIN_PACKET_LEN) {
+				dev_warn(pcu->dev,
+					 "Short packet received (%d bytes), ignoring\n",
+					 pcu->read_pos);
+			} else if (pcu->check_sum != 0) {
+				dev_warn(pcu->dev,
+					 "Invalid checksum in packet (%d bytes), ignoring\n",
+					 pcu->read_pos);
+			} else {
+				ims_pcu_handle_response(pcu);
+			}
+
+			pcu->have_stx = false;
+			pcu->have_dle = false;
+			pcu->read_pos = 0;
+			break;
+
+		default:
+			pcu->read_buf[pcu->read_pos++] = data;
+			pcu->check_sum += data;
+			break;
+		}
+	}
+}
+
+static bool ims_pcu_byte_needs_escape(u8 byte)
+{
+	return byte == IMS_PCU_PROTOCOL_STX ||
+	       byte == IMS_PCU_PROTOCOL_ETX ||
+	       byte == IMS_PCU_PROTOCOL_DLE;
+}
+
+static int ims_pcu_send_cmd_chunk(struct ims_pcu *pcu,
+				  u8 command, int chunk, int len)
+{
+	int error;
+
+	error = usb_bulk_msg(pcu->udev,
+			     usb_sndbulkpipe(pcu->udev,
+					     pcu->ep_out->bEndpointAddress),
+			     pcu->urb_out_buf, len,
+			     NULL, IMS_PCU_CMD_WRITE_TIMEOUT);
+	if (error < 0) {
+		dev_dbg(pcu->dev,
+			"Sending 0x%02x command failed at chunk %d: %d\n",
+			command, chunk, error);
+		return error;
+	}
+
+	return 0;
+}
+
+static int ims_pcu_send_command(struct ims_pcu *pcu,
+				u8 command, const u8 *data, int len)
+{
+	int count = 0;
+	int chunk = 0;
+	int delta;
+	int i;
+	int error;
+	u8 csum = 0;
+	u8 ack_id;
+
+	pcu->urb_out_buf[count++] = IMS_PCU_PROTOCOL_STX;
+
+	/* We know the command need not be escaped */
+	pcu->urb_out_buf[count++] = command;
+	csum += command;
+
+	ack_id = pcu->ack_id++;
+	if (ack_id == 0xff)
+		ack_id = pcu->ack_id++;
+
+	if (ims_pcu_byte_needs_escape(ack_id))
+		pcu->urb_out_buf[count++] = IMS_PCU_PROTOCOL_DLE;
+
+	pcu->urb_out_buf[count++] = ack_id;
+	csum += ack_id;
+
+	for (i = 0; i < len; i++) {
+
+		delta = ims_pcu_byte_needs_escape(data[i]) ? 2 : 1;
+		if (count + delta >= pcu->max_out_size) {
+			error = ims_pcu_send_cmd_chunk(pcu, command,
+						       ++chunk, count);
+			if (error)
+				return error;
+
+			count = 0;
+		}
+
+		if (delta == 2)
+			pcu->urb_out_buf[count++] = IMS_PCU_PROTOCOL_DLE;
+
+		pcu->urb_out_buf[count++] = data[i];
+		csum += data[i];
+	}
+
+	csum = 1 + ~csum;
+
+	delta = ims_pcu_byte_needs_escape(csum) ? 3 : 2;
+	if (count + delta >= pcu->max_out_size) {
+		error = ims_pcu_send_cmd_chunk(pcu, command, ++chunk, count);
+		if (error)
+			return error;
+
+		count = 0;
+	}
+
+	if (delta == 3)
+		pcu->urb_out_buf[count++] = IMS_PCU_PROTOCOL_DLE;
+
+	pcu->urb_out_buf[count++] = csum;
+	pcu->urb_out_buf[count++] = IMS_PCU_PROTOCOL_ETX;
+
+	return ims_pcu_send_cmd_chunk(pcu, command, ++chunk, count);
+}
+
+static int __ims_pcu_execute_command(struct ims_pcu *pcu,
+				     u8 command, const void *data, size_t len,
+				     u8 expected_response, int response_time)
+{
+	int error;
+
+	pcu->expected_response = expected_response;
+	init_completion(&pcu->cmd_done);
+
+	error = ims_pcu_send_command(pcu, command, data, len);
+	if (error)
+		return error;
+
+	if (expected_response &&
+	    !wait_for_completion_timeout(&pcu->cmd_done,
+					 msecs_to_jiffies(response_time))) {
+		dev_dbg(pcu->dev, "Command 0x%02x timed out\n", command);
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+#define ims_pcu_execute_command(pcu, code, data, len)			\
+	__ims_pcu_execute_command(pcu,					\
+				  IMS_PCU_CMD_##code, data, len,	\
+				  IMS_PCU_RSP_##code,			\
+				  IMS_PCU_CMD_RESPONSE_TIMEOUT)
+
+#define ims_pcu_execute_query(pcu, code)				\
+	ims_pcu_execute_command(pcu, code, NULL, 0)
+
+/* Bootloader commands */
+#define IMS_PCU_BL_CMD_QUERY_DEVICE	0xa1
+#define IMS_PCU_BL_CMD_UNLOCK_CONFIG	0xa2
+#define IMS_PCU_BL_CMD_ERASE_APP	0xa3
+#define IMS_PCU_BL_CMD_PROGRAM_DEVICE	0xa4
+#define IMS_PCU_BL_CMD_PROGRAM_COMPLETE	0xa5
+#define IMS_PCU_BL_CMD_READ_APP		0xa6
+#define IMS_PCU_BL_CMD_RESET_DEVICE	0xa7
+#define IMS_PCU_BL_CMD_LAUNCH_APP	0xa8
+
+/* Bootloader commands */
+#define IMS_PCU_BL_RSP_QUERY_DEVICE	0xc1
+#define IMS_PCU_BL_RSP_UNLOCK_CONFIG	0xc2
+#define IMS_PCU_BL_RSP_ERASE_APP	0xc3
+#define IMS_PCU_BL_RSP_PROGRAM_DEVICE	0xc4
+#define IMS_PCU_BL_RSP_PROGRAM_COMPLETE	0xc5
+#define IMS_PCU_BL_RSP_READ_APP		0xc6
+#define IMS_PCU_BL_RSP_RESET_DEVICE	0	/* originally 0xa7 */
+#define IMS_PCU_BL_RSP_LAUNCH_APP	0	/* originally 0xa8 */
+
+#define IMS_PCU_BL_DATA_OFFSET		3
+
+static int __ims_pcu_execute_bl_command(struct ims_pcu *pcu,
+				        u8 command, const void *data, size_t len,
+				        u8 expected_response, int response_time)
+{
+	int error;
+
+	pcu->cmd_buf[0] = command;
+	if (data)
+		memcpy(&pcu->cmd_buf[1], data, len);
+
+	error = __ims_pcu_execute_command(pcu,
+				IMS_PCU_CMD_BOOTLOADER, pcu->cmd_buf, len + 1,
+				expected_response ? IMS_PCU_RSP_BOOTLOADER : 0,
+				response_time);
+	if (error) {
+		dev_err(pcu->dev,
+			"Failure when sending 0x%02x command to bootloader, error: %d\n",
+			pcu->cmd_buf[0], error);
+		return error;
+	}
+
+	if (expected_response && pcu->cmd_buf[2] != expected_response) {
+		dev_err(pcu->dev,
+			"Unexpected response from bootloader: 0x%02x, wanted 0x%02x\n",
+			pcu->cmd_buf[2], expected_response);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+#define ims_pcu_execute_bl_command(pcu, code, data, len, timeout)	\
+	__ims_pcu_execute_bl_command(pcu,				\
+				     IMS_PCU_BL_CMD_##code, data, len,	\
+				     IMS_PCU_BL_RSP_##code, timeout)	\
+
+#define IMS_PCU_INFO_PART_OFFSET	2
+#define IMS_PCU_INFO_DOM_OFFSET		17
+#define IMS_PCU_INFO_SERIAL_OFFSET	25
+
+#define IMS_PCU_SET_INFO_SIZE		31
+
+static int ims_pcu_get_info(struct ims_pcu *pcu)
+{
+	int error;
+
+	error = ims_pcu_execute_query(pcu, GET_INFO);
+	if (error) {
+		dev_err(pcu->dev,
+			"GET_INFO command failed, error: %d\n", error);
+		return error;
+	}
+
+	memcpy(pcu->part_number,
+	       &pcu->cmd_buf[IMS_PCU_INFO_PART_OFFSET],
+	       sizeof(pcu->part_number));
+	memcpy(pcu->date_of_manufacturing,
+	       &pcu->cmd_buf[IMS_PCU_INFO_DOM_OFFSET],
+	       sizeof(pcu->date_of_manufacturing));
+	memcpy(pcu->serial_number,
+	       &pcu->cmd_buf[IMS_PCU_INFO_SERIAL_OFFSET],
+	       sizeof(pcu->serial_number));
+
+	return 0;
+}
+
+static int ims_pcu_set_info(struct ims_pcu *pcu)
+{
+	int error;
+
+	memcpy(&pcu->cmd_buf[IMS_PCU_INFO_PART_OFFSET],
+	       pcu->part_number, sizeof(pcu->part_number));
+	memcpy(&pcu->cmd_buf[IMS_PCU_INFO_DOM_OFFSET],
+	       pcu->date_of_manufacturing, sizeof(pcu->date_of_manufacturing));
+	memcpy(&pcu->cmd_buf[IMS_PCU_INFO_SERIAL_OFFSET],
+	       pcu->serial_number, sizeof(pcu->serial_number));
+
+	error = ims_pcu_execute_command(pcu, SET_INFO,
+					&pcu->cmd_buf[IMS_PCU_DATA_OFFSET],
+					IMS_PCU_SET_INFO_SIZE);
+	if (error) {
+		dev_err(pcu->dev,
+			"Failed to update device information, error: %d\n",
+			error);
+		return error;
+	}
+
+	return 0;
+}
+
+static int ims_pcu_switch_to_bootloader(struct ims_pcu *pcu)
+{
+	int error;
+
+	/* Execute jump to the bootoloader */
+	error = ims_pcu_execute_command(pcu, JUMP_TO_BTLDR, NULL, 0);
+	if (error) {
+		dev_err(pcu->dev,
+			"Failure when sending JUMP TO BOOLTLOADER command, error: %d\n",
+			error);
+		return error;
+	}
+
+	return 0;
+}
+
+/*********************************************************************
+ *             Firmware Update handling                              *
+ *********************************************************************/
+
+#define IMS_PCU_FIRMWARE_NAME	"imspcu.fw"
+
+struct ims_pcu_flash_fmt {
+	__le32 addr;
+	u8 len;
+	u8 data[];
+};
+
+static unsigned int ims_pcu_count_fw_records(const struct firmware *fw)
+{
+	const struct ihex_binrec *rec = (const struct ihex_binrec *)fw->data;
+	unsigned int count = 0;
+
+	while (rec) {
+		count++;
+		rec = ihex_next_binrec(rec);
+	}
+
+	return count;
+}
+
+static int ims_pcu_verify_block(struct ims_pcu *pcu,
+				u32 addr, u8 len, const u8 *data)
+{
+	struct ims_pcu_flash_fmt *fragment;
+	int error;
+
+	fragment = (void *)&pcu->cmd_buf[1];
+	put_unaligned_le32(addr, &fragment->addr);
+	fragment->len = len;
+
+	error = ims_pcu_execute_bl_command(pcu, READ_APP, NULL, 5,
+					IMS_PCU_CMD_RESPONSE_TIMEOUT);
+	if (error) {
+		dev_err(pcu->dev,
+			"Failed to retrieve block at 0x%08x, len %d, error: %d\n",
+			addr, len, error);
+		return error;
+	}
+
+	fragment = (void *)&pcu->cmd_buf[IMS_PCU_BL_DATA_OFFSET];
+	if (get_unaligned_le32(&fragment->addr) != addr ||
+	    fragment->len != len) {
+		dev_err(pcu->dev,
+			"Wrong block when retrieving 0x%08x (0x%08x), len %d (%d)\n",
+			addr, get_unaligned_le32(&fragment->addr),
+			len, fragment->len);
+		return -EINVAL;
+	}
+
+	if (memcmp(fragment->data, data, len)) {
+		dev_err(pcu->dev,
+			"Mismatch in block at 0x%08x, len %d\n",
+			addr, len);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int ims_pcu_flash_firmware(struct ims_pcu *pcu,
+				  const struct firmware *fw,
+				  unsigned int n_fw_records)
+{
+	const struct ihex_binrec *rec = (const struct ihex_binrec *)fw->data;
+	struct ims_pcu_flash_fmt *fragment;
+	unsigned int count = 0;
+	u32 addr;
+	u8 len;
+	int error;
+
+	error = ims_pcu_execute_bl_command(pcu, ERASE_APP, NULL, 0, 2000);
+	if (error) {
+		dev_err(pcu->dev,
+			"Failed to erase application image, error: %d\n",
+			error);
+		return error;
+	}
+
+	while (rec) {
+		/*
+		 * The firmware format is messed up for some reason.
+		 * The address twice that of what is needed for some
+		 * reason and we end up overwriting half of the data
+		 * with the next record.
+		 */
+		addr = be32_to_cpu(rec->addr) / 2;
+		len = be16_to_cpu(rec->len);
+
+		fragment = (void *)&pcu->cmd_buf[1];
+		put_unaligned_le32(addr, &fragment->addr);
+		fragment->len = len;
+		memcpy(fragment->data, rec->data, len);
+
+		error = ims_pcu_execute_bl_command(pcu, PROGRAM_DEVICE,
+						NULL, len + 5,
+						IMS_PCU_CMD_RESPONSE_TIMEOUT);
+		if (error) {
+			dev_err(pcu->dev,
+				"Failed to write block at 0x%08x, len %d, error: %d\n",
+				addr, len, error);
+			return error;
+		}
+
+		if (addr >= pcu->fw_start_addr && addr < pcu->fw_end_addr) {
+			error = ims_pcu_verify_block(pcu, addr, len, rec->data);
+			if (error)
+				return error;
+		}
+
+		count++;
+		pcu->update_firmware_status = (count * 100) / n_fw_records;
+
+		rec = ihex_next_binrec(rec);
+	}
+
+	error = ims_pcu_execute_bl_command(pcu, PROGRAM_COMPLETE,
+					    NULL, 0, 2000);
+	if (error)
+		dev_err(pcu->dev,
+			"Failed to send PROGRAM_COMPLETE, error: %d\n",
+			error);
+
+	return 0;
+}
+
+static int ims_pcu_handle_firmware_update(struct ims_pcu *pcu,
+					  const struct firmware *fw)
+{
+	unsigned int n_fw_records;
+	int retval;
+
+	dev_info(pcu->dev, "Updating firmware %s, size: %zu\n",
+		 IMS_PCU_FIRMWARE_NAME, fw->size);
+
+	n_fw_records = ims_pcu_count_fw_records(fw);
+
+	retval = ims_pcu_flash_firmware(pcu, fw, n_fw_records);
+	if (retval)
+		goto out;
+
+	retval = ims_pcu_execute_bl_command(pcu, LAUNCH_APP, NULL, 0, 0);
+	if (retval)
+		dev_err(pcu->dev,
+			"Failed to start application image, error: %d\n",
+			retval);
+
+out:
+	pcu->update_firmware_status = retval;
+	sysfs_notify(&pcu->dev->kobj, NULL, "update_firmware_status");
+	return retval;
+}
+
+static void ims_pcu_process_async_firmware(const struct firmware *fw,
+					   void *context)
+{
+	struct ims_pcu *pcu = context;
+	int error;
+
+	if (!fw) {
+		dev_err(pcu->dev, "Failed to get firmware %s\n",
+			IMS_PCU_FIRMWARE_NAME);
+		goto out;
+	}
+
+	error = ihex_validate_fw(fw);
+	if (error) {
+		dev_err(pcu->dev, "Firmware %s is invalid\n",
+			IMS_PCU_FIRMWARE_NAME);
+		goto out;
+	}
+
+	mutex_lock(&pcu->cmd_mutex);
+	ims_pcu_handle_firmware_update(pcu, fw);
+	mutex_unlock(&pcu->cmd_mutex);
+
+	release_firmware(fw);
+
+out:
+	complete(&pcu->async_firmware_done);
+}
+
+/*********************************************************************
+ *             Backlight LED device support                          *
+ *********************************************************************/
+
+#define IMS_PCU_MAX_BRIGHTNESS		31998
+
+static void ims_pcu_backlight_work(struct work_struct *work)
+{
+	struct ims_pcu_backlight *backlight =
+			container_of(work, struct ims_pcu_backlight, work);
+	struct ims_pcu *pcu =
+			container_of(backlight, struct ims_pcu, backlight);
+	int desired_brightness = backlight->desired_brightness;
+	__le16 br_val = cpu_to_le16(desired_brightness);
+	int error;
+
+	mutex_lock(&pcu->cmd_mutex);
+
+	error = ims_pcu_execute_command(pcu, SET_BRIGHTNESS,
+					&br_val, sizeof(br_val));
+	if (error && error != -ENODEV)
+		dev_warn(pcu->dev,
+			 "Failed to set desired brightness %u, error: %d\n",
+			 desired_brightness, error);
+
+	mutex_unlock(&pcu->cmd_mutex);
+}
+
+static void ims_pcu_backlight_set_brightness(struct led_classdev *cdev,
+					     enum led_brightness value)
+{
+	struct ims_pcu_backlight *backlight =
+			container_of(cdev, struct ims_pcu_backlight, cdev);
+
+	backlight->desired_brightness = value;
+	schedule_work(&backlight->work);
+}
+
+static enum led_brightness
+ims_pcu_backlight_get_brightness(struct led_classdev *cdev)
+{
+	struct ims_pcu_backlight *backlight =
+			container_of(cdev, struct ims_pcu_backlight, cdev);
+	struct ims_pcu *pcu =
+			container_of(backlight, struct ims_pcu, backlight);
+	int brightness;
+	int error;
+
+	mutex_lock(&pcu->cmd_mutex);
+
+	error = ims_pcu_execute_query(pcu, GET_BRIGHTNESS);
+	if (error) {
+		dev_warn(pcu->dev,
+			 "Failed to get current brightness, error: %d\n",
+			 error);
+		/* Assume the LED is OFF */
+		brightness = LED_OFF;
+	} else {
+		brightness =
+			get_unaligned_le16(&pcu->cmd_buf[IMS_PCU_DATA_OFFSET]);
+	}
+
+	mutex_unlock(&pcu->cmd_mutex);
+
+	return brightness;
+}
+
+static int ims_pcu_setup_backlight(struct ims_pcu *pcu)
+{
+	struct ims_pcu_backlight *backlight = &pcu->backlight;
+	int error;
+
+	INIT_WORK(&backlight->work, ims_pcu_backlight_work);
+	snprintf(backlight->name, sizeof(backlight->name),
+		 "pcu%d::kbd_backlight", pcu->device_no);
+
+	backlight->cdev.name = backlight->name;
+	backlight->cdev.max_brightness = IMS_PCU_MAX_BRIGHTNESS;
+	backlight->cdev.brightness_get = ims_pcu_backlight_get_brightness;
+	backlight->cdev.brightness_set = ims_pcu_backlight_set_brightness;
+
+	error = led_classdev_register(pcu->dev, &backlight->cdev);
+	if (error) {
+		dev_err(pcu->dev,
+			"Failed to register backlight LED device, error: %d\n",
+			error);
+		return error;
+	}
+
+	return 0;
+}
+
+static void ims_pcu_destroy_backlight(struct ims_pcu *pcu)
+{
+	struct ims_pcu_backlight *backlight = &pcu->backlight;
+
+	led_classdev_unregister(&backlight->cdev);
+	cancel_work_sync(&backlight->work);
+}
+
+
+/*********************************************************************
+ *             Sysfs attributes handling                             *
+ *********************************************************************/
+
+struct ims_pcu_attribute {
+	struct device_attribute dattr;
+	size_t field_offset;
+	int field_length;
+};
+
+static ssize_t ims_pcu_attribute_show(struct device *dev,
+				      struct device_attribute *dattr,
+				      char *buf)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct ims_pcu *pcu = usb_get_intfdata(intf);
+	struct ims_pcu_attribute *attr =
+			container_of(dattr, struct ims_pcu_attribute, dattr);
+	char *field = (char *)pcu + attr->field_offset;
+
+	return scnprintf(buf, PAGE_SIZE, "%.*s\n", attr->field_length, field);
+}
+
+static ssize_t ims_pcu_attribute_store(struct device *dev,
+				       struct device_attribute *dattr,
+				       const char *buf, size_t count)
+{
+
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct ims_pcu *pcu = usb_get_intfdata(intf);
+	struct ims_pcu_attribute *attr =
+			container_of(dattr, struct ims_pcu_attribute, dattr);
+	char *field = (char *)pcu + attr->field_offset;
+	size_t data_len;
+	int error;
+
+	if (count > attr->field_length)
+		return -EINVAL;
+
+	data_len = strnlen(buf, attr->field_length);
+	if (data_len > attr->field_length)
+		return -EINVAL;
+
+	error = mutex_lock_interruptible(&pcu->cmd_mutex);
+	if (error)
+		return error;
+
+	memset(field, 0, attr->field_length);
+	memcpy(field, buf, data_len);
+
+	error = ims_pcu_set_info(pcu);
+
+	/*
+	 * Even if update failed, let's fetch the info again as we just
+	 * clobbered one of the fields.
+	 */
+	ims_pcu_get_info(pcu);
+
+	mutex_unlock(&pcu->cmd_mutex);
+
+	return error < 0 ? error : count;
+}
+
+#define IMS_PCU_ATTR(_field, _mode)					\
+struct ims_pcu_attribute ims_pcu_attr_##_field = {			\
+	.dattr = __ATTR(_field, _mode,					\
+			ims_pcu_attribute_show,				\
+			ims_pcu_attribute_store),			\
+	.field_offset = offsetof(struct ims_pcu, _field),		\
+	.field_length = sizeof(((struct ims_pcu *)NULL)->_field),	\
+}
+
+#define IMS_PCU_RO_ATTR(_field)						\
+		IMS_PCU_ATTR(_field, S_IRUGO)
+#define IMS_PCU_RW_ATTR(_field)						\
+		IMS_PCU_ATTR(_field, S_IRUGO | S_IWUSR)
+
+static IMS_PCU_RW_ATTR(part_number);
+static IMS_PCU_RW_ATTR(serial_number);
+static IMS_PCU_RW_ATTR(date_of_manufacturing);
+
+static IMS_PCU_RO_ATTR(fw_version);
+static IMS_PCU_RO_ATTR(bl_version);
+static IMS_PCU_RO_ATTR(reset_reason);
+
+static ssize_t ims_pcu_reset_device(struct device *dev,
+				    struct device_attribute *dattr,
+				    const char *buf, size_t count)
+{
+	static const u8 reset_byte = 1;
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct ims_pcu *pcu = usb_get_intfdata(intf);
+	int value;
+	int error;
+
+	error = kstrtoint(buf, 0, &value);
+	if (error)
+		return error;
+
+	if (value != 1)
+		return -EINVAL;
+
+	dev_info(pcu->dev, "Attempting to reset device\n");
+
+	error = ims_pcu_execute_command(pcu, PCU_RESET, &reset_byte, 1);
+	if (error) {
+		dev_info(pcu->dev,
+			 "Failed to reset device, error: %d\n",
+			 error);
+		return error;
+	}
+
+	return count;
+}
+
+static DEVICE_ATTR(reset_device, S_IWUSR, NULL, ims_pcu_reset_device);
+
+static ssize_t ims_pcu_update_firmware_store(struct device *dev,
+					     struct device_attribute *dattr,
+					     const char *buf, size_t count)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct ims_pcu *pcu = usb_get_intfdata(intf);
+	const struct firmware *fw;
+	int value;
+	int error;
+
+	error = kstrtoint(buf, 0, &value);
+	if (error)
+		return error;
+
+	if (value != 1)
+		return -EINVAL;
+
+	error = mutex_lock_interruptible(&pcu->cmd_mutex);
+	if (error)
+		return error;
+
+	error = request_ihex_firmware(&fw, IMS_PCU_FIRMWARE_NAME, pcu->dev);
+	if (error) {
+		dev_err(pcu->dev, "Failed to request firmware %s, error: %d\n",
+			IMS_PCU_FIRMWARE_NAME, error);
+		goto out;
+	}
+
+	/*
+	 * If we are already in bootloader mode we can proceed with
+	 * flashing the firmware.
+	 *
+	 * If we are in application mode, then we need to switch into
+	 * bootloader mode, which will cause the device to disconnect
+	 * and reconnect as different device.
+	 */
+	if (pcu->bootloader_mode)
+		error = ims_pcu_handle_firmware_update(pcu, fw);
+	else
+		error = ims_pcu_switch_to_bootloader(pcu);
+
+	release_firmware(fw);
+
+out:
+	mutex_unlock(&pcu->cmd_mutex);
+	return error ?: count;
+}
+
+static DEVICE_ATTR(update_firmware, S_IWUSR,
+		   NULL, ims_pcu_update_firmware_store);
+
+static ssize_t
+ims_pcu_update_firmware_status_show(struct device *dev,
+				    struct device_attribute *dattr,
+				    char *buf)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct ims_pcu *pcu = usb_get_intfdata(intf);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", pcu->update_firmware_status);
+}
+
+static DEVICE_ATTR(update_firmware_status, S_IRUGO,
+		   ims_pcu_update_firmware_status_show, NULL);
+
+static struct attribute *ims_pcu_attrs[] = {
+	&ims_pcu_attr_part_number.dattr.attr,
+	&ims_pcu_attr_serial_number.dattr.attr,
+	&ims_pcu_attr_date_of_manufacturing.dattr.attr,
+	&ims_pcu_attr_fw_version.dattr.attr,
+	&ims_pcu_attr_bl_version.dattr.attr,
+	&ims_pcu_attr_reset_reason.dattr.attr,
+	&dev_attr_reset_device.attr,
+	&dev_attr_update_firmware.attr,
+	&dev_attr_update_firmware_status.attr,
+	NULL
+};
+
+static umode_t ims_pcu_is_attr_visible(struct kobject *kobj,
+				       struct attribute *attr, int n)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct ims_pcu *pcu = usb_get_intfdata(intf);
+	umode_t mode = attr->mode;
+
+	if (pcu->bootloader_mode) {
+		if (attr != &dev_attr_update_firmware_status.attr &&
+		    attr != &dev_attr_update_firmware.attr &&
+		    attr != &dev_attr_reset_device.attr) {
+			mode = 0;
+		}
+	} else {
+		if (attr == &dev_attr_update_firmware_status.attr)
+			mode = 0;
+	}
+
+	return mode;
+}
+
+static struct attribute_group ims_pcu_attr_group = {
+	.is_visible	= ims_pcu_is_attr_visible,
+	.attrs		= ims_pcu_attrs,
+};
+
+static void ims_pcu_irq(struct urb *urb)
+{
+	struct ims_pcu *pcu = urb->context;
+	int retval, status;
+
+	status = urb->status;
+
+	switch (status) {
+	case 0:
+		/* success */
+		break;
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		/* this urb is terminated, clean up */
+		dev_dbg(pcu->dev, "%s - urb shutting down with status: %d\n",
+			__func__, status);
+		return;
+	default:
+		dev_dbg(pcu->dev, "%s - nonzero urb status received: %d\n",
+			__func__, status);
+		goto exit;
+	}
+
+	dev_dbg(pcu->dev, "%s: received %d: %*ph\n", __func__,
+		urb->actual_length, urb->actual_length, pcu->urb_in_buf);
+
+	if (urb == pcu->urb_in)
+		ims_pcu_process_data(pcu, urb);
+
+exit:
+	retval = usb_submit_urb(urb, GFP_ATOMIC);
+	if (retval && retval != -ENODEV)
+		dev_err(pcu->dev, "%s - usb_submit_urb failed with result %d\n",
+			__func__, retval);
+}
+
+static int ims_pcu_buffers_alloc(struct ims_pcu *pcu)
+{
+	int error;
+
+	pcu->urb_in_buf = usb_alloc_coherent(pcu->udev, pcu->max_in_size,
+					     GFP_KERNEL, &pcu->read_dma);
+	if (!pcu->urb_in_buf) {
+		dev_err(pcu->dev,
+			"Failed to allocate memory for read buffer\n");
+		return -ENOMEM;
+	}
+
+	pcu->urb_in = usb_alloc_urb(0, GFP_KERNEL);
+	if (!pcu->urb_in) {
+		dev_err(pcu->dev, "Failed to allocate input URB\n");
+		error = -ENOMEM;
+		goto err_free_urb_in_buf;
+	}
+
+	pcu->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+	pcu->urb_in->transfer_dma = pcu->read_dma;
+
+	usb_fill_bulk_urb(pcu->urb_in, pcu->udev,
+			  usb_rcvbulkpipe(pcu->udev,
+					  pcu->ep_in->bEndpointAddress),
+			  pcu->urb_in_buf, pcu->max_in_size,
+			  ims_pcu_irq, pcu);
+
+	/*
+	 * We are using usb_bulk_msg() for sending so there is no point
+	 * in allocating memory with usb_alloc_coherent().
+	 */
+	pcu->urb_out_buf = kmalloc(pcu->max_out_size, GFP_KERNEL);
+	if (!pcu->urb_out_buf) {
+		dev_err(pcu->dev, "Failed to allocate memory for write buffer\n");
+		error = -ENOMEM;
+		goto err_free_in_urb;
+	}
+
+	pcu->urb_ctrl_buf = usb_alloc_coherent(pcu->udev, pcu->max_ctrl_size,
+					       GFP_KERNEL, &pcu->ctrl_dma);
+	if (!pcu->urb_ctrl_buf) {
+		dev_err(pcu->dev,
+			"Failed to allocate memory for read buffer\n");
+		goto err_free_urb_out_buf;
+	}
+
+	pcu->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL);
+	if (!pcu->urb_ctrl) {
+		dev_err(pcu->dev, "Failed to allocate input URB\n");
+		error = -ENOMEM;
+		goto err_free_urb_ctrl_buf;
+	}
+
+	pcu->urb_ctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+	pcu->urb_ctrl->transfer_dma = pcu->ctrl_dma;
+
+	usb_fill_int_urb(pcu->urb_ctrl, pcu->udev,
+			  usb_rcvintpipe(pcu->udev,
+					 pcu->ep_ctrl->bEndpointAddress),
+			  pcu->urb_ctrl_buf, pcu->max_ctrl_size,
+			  ims_pcu_irq, pcu, pcu->ep_ctrl->bInterval);
+
+	return 0;
+
+err_free_urb_ctrl_buf:
+	usb_free_coherent(pcu->udev, pcu->max_ctrl_size,
+			  pcu->urb_ctrl_buf, pcu->ctrl_dma);
+err_free_urb_out_buf:
+	kfree(pcu->urb_out_buf);
+err_free_in_urb:
+	usb_free_urb(pcu->urb_in);
+err_free_urb_in_buf:
+	usb_free_coherent(pcu->udev, pcu->max_in_size,
+			  pcu->urb_in_buf, pcu->read_dma);
+	return error;
+}
+
+static void ims_pcu_buffers_free(struct ims_pcu *pcu)
+{
+	usb_kill_urb(pcu->urb_in);
+	usb_free_urb(pcu->urb_in);
+
+	usb_free_coherent(pcu->udev, pcu->max_out_size,
+			  pcu->urb_in_buf, pcu->read_dma);
+
+	kfree(pcu->urb_out_buf);
+
+	usb_kill_urb(pcu->urb_ctrl);
+	usb_free_urb(pcu->urb_ctrl);
+
+	usb_free_coherent(pcu->udev, pcu->max_ctrl_size,
+			  pcu->urb_ctrl_buf, pcu->ctrl_dma);
+}
+
+static const struct usb_cdc_union_desc *
+ims_pcu_get_cdc_union_desc(struct usb_interface *intf)
+{
+	const void *buf = intf->altsetting->extra;
+	size_t buflen = intf->altsetting->extralen;
+	struct usb_cdc_union_desc *union_desc;
+
+	if (!buf) {
+		dev_err(&intf->dev, "Missing descriptor data\n");
+		return NULL;
+	}
+
+	if (!buflen) {
+		dev_err(&intf->dev, "Zero length descriptor\n");
+		return NULL;
+	}
+
+	while (buflen > 0) {
+		union_desc = (struct usb_cdc_union_desc *)buf;
+
+		if (union_desc->bDescriptorType == USB_DT_CS_INTERFACE &&
+		    union_desc->bDescriptorSubType == USB_CDC_UNION_TYPE) {
+			dev_dbg(&intf->dev, "Found union header\n");
+			return union_desc;
+		}
+
+		buflen -= union_desc->bLength;
+		buf += union_desc->bLength;
+	}
+
+	dev_err(&intf->dev, "Missing CDC union descriptor\n");
+	return NULL;
+}
+
+static int ims_pcu_parse_cdc_data(struct usb_interface *intf, struct ims_pcu *pcu)
+{
+	const struct usb_cdc_union_desc *union_desc;
+	struct usb_host_interface *alt;
+
+	union_desc = ims_pcu_get_cdc_union_desc(intf);
+	if (!union_desc)
+		return -EINVAL;
+
+	pcu->ctrl_intf = usb_ifnum_to_if(pcu->udev,
+					 union_desc->bMasterInterface0);
+
+	alt = pcu->ctrl_intf->cur_altsetting;
+	pcu->ep_ctrl = &alt->endpoint[0].desc;
+	pcu->max_ctrl_size = usb_endpoint_maxp(pcu->ep_ctrl);
+
+	pcu->data_intf = usb_ifnum_to_if(pcu->udev,
+					 union_desc->bSlaveInterface0);
+
+	alt = pcu->data_intf->cur_altsetting;
+	if (alt->desc.bNumEndpoints != 2) {
+		dev_err(pcu->dev,
+			"Incorrect number of endpoints on data interface (%d)\n",
+			alt->desc.bNumEndpoints);
+		return -EINVAL;
+	}
+
+	pcu->ep_out = &alt->endpoint[0].desc;
+	if (!usb_endpoint_is_bulk_out(pcu->ep_out)) {
+		dev_err(pcu->dev,
+			"First endpoint on data interface is not BULK OUT\n");
+		return -EINVAL;
+	}
+
+	pcu->max_out_size = usb_endpoint_maxp(pcu->ep_out);
+	if (pcu->max_out_size < 8) {
+		dev_err(pcu->dev,
+			"Max OUT packet size is too small (%zd)\n",
+			pcu->max_out_size);
+		return -EINVAL;
+	}
+
+	pcu->ep_in = &alt->endpoint[1].desc;
+	if (!usb_endpoint_is_bulk_in(pcu->ep_in)) {
+		dev_err(pcu->dev,
+			"Second endpoint on data interface is not BULK IN\n");
+		return -EINVAL;
+	}
+
+	pcu->max_in_size = usb_endpoint_maxp(pcu->ep_in);
+	if (pcu->max_in_size < 8) {
+		dev_err(pcu->dev,
+			"Max IN packet size is too small (%zd)\n",
+			pcu->max_in_size);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int ims_pcu_start_io(struct ims_pcu *pcu)
+{
+	int error;
+
+	error = usb_submit_urb(pcu->urb_ctrl, GFP_KERNEL);
+	if (error) {
+		dev_err(pcu->dev,
+			"Failed to start control IO - usb_submit_urb failed with result: %d\n",
+			error);
+		return -EIO;
+	}
+
+	error = usb_submit_urb(pcu->urb_in, GFP_KERNEL);
+	if (error) {
+		dev_err(pcu->dev,
+			"Failed to start IO - usb_submit_urb failed with result: %d\n",
+			error);
+		usb_kill_urb(pcu->urb_ctrl);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void ims_pcu_stop_io(struct ims_pcu *pcu)
+{
+	usb_kill_urb(pcu->urb_in);
+	usb_kill_urb(pcu->urb_ctrl);
+}
+
+static int ims_pcu_line_setup(struct ims_pcu *pcu)
+{
+	struct usb_host_interface *interface = pcu->ctrl_intf->cur_altsetting;
+	struct usb_cdc_line_coding *line = (void *)pcu->cmd_buf;
+	int error;
+
+	memset(line, 0, sizeof(*line));
+	line->dwDTERate = cpu_to_le32(57600);
+	line->bDataBits = 8;
+
+	error = usb_control_msg(pcu->udev, usb_sndctrlpipe(pcu->udev, 0),
+				USB_CDC_REQ_SET_LINE_CODING,
+				USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+				0, interface->desc.bInterfaceNumber,
+				line, sizeof(struct usb_cdc_line_coding),
+				5000);
+	if (error < 0) {
+		dev_err(pcu->dev, "Failed to set line coding, error: %d\n",
+			error);
+		return error;
+	}
+
+	error = usb_control_msg(pcu->udev, usb_sndctrlpipe(pcu->udev, 0),
+				USB_CDC_REQ_SET_CONTROL_LINE_STATE,
+				USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+				0x03, interface->desc.bInterfaceNumber,
+				NULL, 0, 5000);
+	if (error < 0) {
+		dev_err(pcu->dev, "Failed to set line state, error: %d\n",
+			error);
+		return error;
+	}
+
+	return 0;
+}
+
+static int ims_pcu_get_device_info(struct ims_pcu *pcu)
+{
+	int error;
+
+	error = ims_pcu_get_info(pcu);
+	if (error)
+		return error;
+
+	error = ims_pcu_execute_query(pcu, GET_FW_VERSION);
+	if (error) {
+		dev_err(pcu->dev,
+			"GET_FW_VERSION command failed, error: %d\n", error);
+		return error;
+	}
+
+	snprintf(pcu->fw_version, sizeof(pcu->fw_version),
+		 "%02d%02d%02d%02d.%c%c",
+		 pcu->cmd_buf[2], pcu->cmd_buf[3], pcu->cmd_buf[4], pcu->cmd_buf[5],
+		 pcu->cmd_buf[6], pcu->cmd_buf[7]);
+
+	error = ims_pcu_execute_query(pcu, GET_BL_VERSION);
+	if (error) {
+		dev_err(pcu->dev,
+			"GET_BL_VERSION command failed, error: %d\n", error);
+		return error;
+	}
+
+	snprintf(pcu->bl_version, sizeof(pcu->bl_version),
+		 "%02d%02d%02d%02d.%c%c",
+		 pcu->cmd_buf[2], pcu->cmd_buf[3], pcu->cmd_buf[4], pcu->cmd_buf[5],
+		 pcu->cmd_buf[6], pcu->cmd_buf[7]);
+
+	error = ims_pcu_execute_query(pcu, RESET_REASON);
+	if (error) {
+		dev_err(pcu->dev,
+			"RESET_REASON command failed, error: %d\n", error);
+		return error;
+	}
+
+	snprintf(pcu->reset_reason, sizeof(pcu->reset_reason),
+		 "%02x", pcu->cmd_buf[IMS_PCU_DATA_OFFSET]);
+
+	dev_dbg(pcu->dev,
+		"P/N: %s, MD: %s, S/N: %s, FW: %s, BL: %s, RR: %s\n",
+		pcu->part_number,
+		pcu->date_of_manufacturing,
+		pcu->serial_number,
+		pcu->fw_version,
+		pcu->bl_version,
+		pcu->reset_reason);
+
+	return 0;
+}
+
+static int ims_pcu_identify_type(struct ims_pcu *pcu, u8 *device_id)
+{
+	int error;
+
+	error = ims_pcu_execute_query(pcu, GET_DEVICE_ID);
+	if (error) {
+		dev_err(pcu->dev,
+			"GET_DEVICE_ID command failed, error: %d\n", error);
+		return error;
+	}
+
+	*device_id = pcu->cmd_buf[IMS_PCU_DATA_OFFSET];
+	dev_dbg(pcu->dev, "Detected device ID: %d\n", *device_id);
+
+	return 0;
+}
+
+static int ims_pcu_init_application_mode(struct ims_pcu *pcu)
+{
+	static atomic_t device_no = ATOMIC_INIT(0);
+
+	const struct ims_pcu_device_info *info;
+	u8 device_id;
+	int error;
+
+	error = ims_pcu_get_device_info(pcu);
+	if (error) {
+		/* Device does not respond to basic queries, hopeless */
+		return error;
+	}
+
+	error = ims_pcu_identify_type(pcu, &device_id);
+	if (error) {
+		dev_err(pcu->dev,
+			"Failed to identify device, error: %d\n", error);
+		/*
+		 * Do not signal error, but do not create input nor
+		 * backlight devices either, let userspace figure this
+		 * out (flash a new firmware?).
+		 */
+		return 0;
+	}
+
+	if (device_id >= ARRAY_SIZE(ims_pcu_device_info) ||
+	    !ims_pcu_device_info[device_id].keymap) {
+		dev_err(pcu->dev, "Device ID %d is not valid\n", device_id);
+		/* Same as above, punt to userspace */
+		return 0;
+	}
+
+	/* Device appears to be operable, complete initialization */
+	pcu->device_no = atomic_inc_return(&device_no) - 1;
+
+	error = ims_pcu_setup_backlight(pcu);
+	if (error)
+		return error;
+
+	info = &ims_pcu_device_info[device_id];
+	error = ims_pcu_setup_buttons(pcu, info->keymap, info->keymap_len);
+	if (error)
+		goto err_destroy_backlight;
+
+	if (info->has_gamepad) {
+		error = ims_pcu_setup_gamepad(pcu);
+		if (error)
+			goto err_destroy_buttons;
+	}
+
+	pcu->setup_complete = true;
+
+	return 0;
+
+err_destroy_backlight:
+	ims_pcu_destroy_backlight(pcu);
+err_destroy_buttons:
+	ims_pcu_destroy_buttons(pcu);
+	return error;
+}
+
+static void ims_pcu_destroy_application_mode(struct ims_pcu *pcu)
+{
+	if (pcu->setup_complete) {
+		pcu->setup_complete = false;
+		mb(); /* make sure flag setting is not reordered */
+
+		if (pcu->gamepad)
+			ims_pcu_destroy_gamepad(pcu);
+		ims_pcu_destroy_buttons(pcu);
+		ims_pcu_destroy_backlight(pcu);
+	}
+}
+
+static int ims_pcu_init_bootloader_mode(struct ims_pcu *pcu)
+{
+	int error;
+
+	error = ims_pcu_execute_bl_command(pcu, QUERY_DEVICE, NULL, 0,
+					   IMS_PCU_CMD_RESPONSE_TIMEOUT);
+	if (error) {
+		dev_err(pcu->dev, "Bootloader does not respond, aborting\n");
+		return error;
+	}
+
+	pcu->fw_start_addr =
+		get_unaligned_le32(&pcu->cmd_buf[IMS_PCU_DATA_OFFSET + 11]);
+	pcu->fw_end_addr =
+		get_unaligned_le32(&pcu->cmd_buf[IMS_PCU_DATA_OFFSET + 15]);
+
+	dev_info(pcu->dev,
+		 "Device is in bootloader mode (addr 0x%08x-0x%08x), requesting firmware\n",
+		 pcu->fw_start_addr, pcu->fw_end_addr);
+
+	error = request_firmware_nowait(THIS_MODULE, true,
+					IMS_PCU_FIRMWARE_NAME,
+					pcu->dev, GFP_KERNEL, pcu,
+					ims_pcu_process_async_firmware);
+	if (error) {
+		/* This error is not fatal, let userspace have another chance */
+		complete(&pcu->async_firmware_done);
+	}
+
+	return 0;
+}
+
+static void ims_pcu_destroy_bootloader_mode(struct ims_pcu *pcu)
+{
+	/* Make sure our initial firmware request has completed */
+	wait_for_completion(&pcu->async_firmware_done);
+}
+
+#define IMS_PCU_APPLICATION_MODE	0
+#define IMS_PCU_BOOTLOADER_MODE		1
+
+static struct usb_driver ims_pcu_driver;
+
+static int ims_pcu_probe(struct usb_interface *intf,
+			 const struct usb_device_id *id)
+{
+	struct usb_device *udev = interface_to_usbdev(intf);
+	struct ims_pcu *pcu;
+	int error;
+
+	pcu = kzalloc(sizeof(struct ims_pcu), GFP_KERNEL);
+	if (!pcu)
+		return -ENOMEM;
+
+	pcu->dev = &intf->dev;
+	pcu->udev = udev;
+	pcu->bootloader_mode = id->driver_info == IMS_PCU_BOOTLOADER_MODE;
+	mutex_init(&pcu->cmd_mutex);
+	init_completion(&pcu->cmd_done);
+	init_completion(&pcu->async_firmware_done);
+
+	error = ims_pcu_parse_cdc_data(intf, pcu);
+	if (error)
+		goto err_free_mem;
+
+	error = usb_driver_claim_interface(&ims_pcu_driver,
+					   pcu->data_intf, pcu);
+	if (error) {
+		dev_err(&intf->dev,
+			"Unable to claim corresponding data interface: %d\n",
+			error);
+		goto err_free_mem;
+	}
+
+	usb_set_intfdata(pcu->ctrl_intf, pcu);
+	usb_set_intfdata(pcu->data_intf, pcu);
+
+	error = ims_pcu_buffers_alloc(pcu);
+	if (error)
+		goto err_unclaim_intf;
+
+	error = ims_pcu_start_io(pcu);
+	if (error)
+		goto err_free_buffers;
+
+	error = ims_pcu_line_setup(pcu);
+	if (error)
+		goto err_stop_io;
+
+	error = sysfs_create_group(&intf->dev.kobj, &ims_pcu_attr_group);
+	if (error)
+		goto err_stop_io;
+
+	error = pcu->bootloader_mode ?
+			ims_pcu_init_bootloader_mode(pcu) :
+			ims_pcu_init_application_mode(pcu);
+	if (error)
+		goto err_remove_sysfs;
+
+	return 0;
+
+err_remove_sysfs:
+	sysfs_remove_group(&intf->dev.kobj, &ims_pcu_attr_group);
+err_stop_io:
+	ims_pcu_stop_io(pcu);
+err_free_buffers:
+	ims_pcu_buffers_free(pcu);
+err_unclaim_intf:
+	usb_driver_release_interface(&ims_pcu_driver, pcu->data_intf);
+err_free_mem:
+	kfree(pcu);
+	return error;
+}
+
+static void ims_pcu_disconnect(struct usb_interface *intf)
+{
+	struct ims_pcu *pcu = usb_get_intfdata(intf);
+	struct usb_host_interface *alt = intf->cur_altsetting;
+
+	usb_set_intfdata(intf, NULL);
+
+	/*
+	 * See if we are dealing with control or data interface. The cleanup
+	 * happens when we unbind primary (control) interface.
+	 */
+	if (alt->desc.bInterfaceClass != USB_CLASS_COMM)
+		return;
+
+	sysfs_remove_group(&intf->dev.kobj, &ims_pcu_attr_group);
+
+	ims_pcu_stop_io(pcu);
+
+	if (pcu->bootloader_mode)
+		ims_pcu_destroy_bootloader_mode(pcu);
+	else
+		ims_pcu_destroy_application_mode(pcu);
+
+	ims_pcu_buffers_free(pcu);
+	kfree(pcu);
+}
+
+#ifdef CONFIG_PM
+static int ims_pcu_suspend(struct usb_interface *intf,
+			   pm_message_t message)
+{
+	struct ims_pcu *pcu = usb_get_intfdata(intf);
+	struct usb_host_interface *alt = intf->cur_altsetting;
+
+	if (alt->desc.bInterfaceClass == USB_CLASS_COMM)
+		ims_pcu_stop_io(pcu);
+
+	return 0;
+}
+
+static int ims_pcu_resume(struct usb_interface *intf)
+{
+	struct ims_pcu *pcu = usb_get_intfdata(intf);
+	struct usb_host_interface *alt = intf->cur_altsetting;
+	int retval = 0;
+
+	if (alt->desc.bInterfaceClass == USB_CLASS_COMM) {
+		retval = ims_pcu_start_io(pcu);
+		if (retval == 0)
+			retval = ims_pcu_line_setup(pcu);
+	}
+
+	return retval;
+}
+#endif
+
+static const struct usb_device_id ims_pcu_id_table[] = {
+	{
+		USB_DEVICE_AND_INTERFACE_INFO(0x04d8, 0x0082,
+					USB_CLASS_COMM,
+					USB_CDC_SUBCLASS_ACM,
+					USB_CDC_ACM_PROTO_AT_V25TER),
+		.driver_info = IMS_PCU_APPLICATION_MODE,
+	},
+	{
+		USB_DEVICE_AND_INTERFACE_INFO(0x04d8, 0x0083,
+					USB_CLASS_COMM,
+					USB_CDC_SUBCLASS_ACM,
+					USB_CDC_ACM_PROTO_AT_V25TER),
+		.driver_info = IMS_PCU_BOOTLOADER_MODE,
+	},
+	{ }
+};
+
+static struct usb_driver ims_pcu_driver = {
+	.name			= "ims_pcu",
+	.id_table		= ims_pcu_id_table,
+	.probe			= ims_pcu_probe,
+	.disconnect		= ims_pcu_disconnect,
+#ifdef CONFIG_PM
+	.suspend		= ims_pcu_suspend,
+	.resume			= ims_pcu_resume,
+	.reset_resume		= ims_pcu_resume,
+#endif
+};
+
+module_usb_driver(ims_pcu_driver);
+
+MODULE_DESCRIPTION("IMS Passenger Control Unit driver");
+MODULE_AUTHOR("Dmitry Torokhov <dmitry.torokhov@gmail.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index 3ec5ef2..aebfe3e 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -245,4 +245,14 @@ config SERIO_ARC_PS2
 	  To compile this driver as a module, choose M here; the module
 	  will be called arc_ps2.
 
+config SERIO_APBPS2
+	tristate "GRLIB APBPS2 PS/2 keyboard/mouse controller"
+	depends on OF
+	help
+	  Say Y here if you want support for GRLIB APBPS2 peripherals used
+	  to connect to PS/2 keyboard and/or mouse.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called apbps2.
+
 endif
diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile
index 4b0c8f8..8edb36c 100644
--- a/drivers/input/serio/Makefile
+++ b/drivers/input/serio/Makefile
@@ -26,3 +26,4 @@ obj-$(CONFIG_SERIO_AMS_DELTA)	+= ams_delta_serio.o
 obj-$(CONFIG_SERIO_XILINX_XPS_PS2)	+= xilinx_ps2.o
 obj-$(CONFIG_SERIO_ALTERA_PS2)	+= altera_ps2.o
 obj-$(CONFIG_SERIO_ARC_PS2)	+= arc_ps2.o
+obj-$(CONFIG_SERIO_APBPS2)	+= apbps2.o
diff --git a/drivers/input/serio/apbps2.c b/drivers/input/serio/apbps2.c
new file mode 100644
index 0000000..2c14e6f
--- /dev/null
+++ b/drivers/input/serio/apbps2.c
@@ -0,0 +1,230 @@
+/*
+ * Copyright (C) 2013 Aeroflex Gaisler
+ *
+ * This driver supports the APBPS2 PS/2 core available in the GRLIB
+ * VHDL IP core library.
+ *
+ * Full documentation of the APBPS2 core can be found here:
+ * http://www.gaisler.com/products/grlib/grip.pdf
+ *
+ * See "Documentation/devicetree/bindings/input/ps2keyb-mouse-apbps2.txt" for
+ * information on open firmware properties.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Contributors: Daniel Hellstrom <daniel@gaisler.com>
+ */
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/module.h>
+#include <linux/serio.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/of_irq.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+
+struct apbps2_regs {
+	u32 __iomem data;	/* 0x00 */
+	u32 __iomem status;	/* 0x04 */
+	u32 __iomem ctrl;	/* 0x08 */
+	u32 __iomem reload;	/* 0x0c */
+};
+
+#define APBPS2_STATUS_DR	(1<<0)
+#define APBPS2_STATUS_PE	(1<<1)
+#define APBPS2_STATUS_FE	(1<<2)
+#define APBPS2_STATUS_KI	(1<<3)
+#define APBPS2_STATUS_RF	(1<<4)
+#define APBPS2_STATUS_TF	(1<<5)
+#define APBPS2_STATUS_TCNT	(0x1f<<22)
+#define APBPS2_STATUS_RCNT	(0x1f<<27)
+
+#define APBPS2_CTRL_RE		(1<<0)
+#define APBPS2_CTRL_TE		(1<<1)
+#define APBPS2_CTRL_RI		(1<<2)
+#define APBPS2_CTRL_TI		(1<<3)
+
+struct apbps2_priv {
+	struct serio		*io;
+	struct apbps2_regs	*regs;
+};
+
+static int apbps2_idx;
+
+static irqreturn_t apbps2_isr(int irq, void *dev_id)
+{
+	struct apbps2_priv *priv = dev_id;
+	unsigned long status, data, rxflags;
+	irqreturn_t ret = IRQ_NONE;
+
+	while ((status = ioread32be(&priv->regs->status)) & APBPS2_STATUS_DR) {
+		data = ioread32be(&priv->regs->data);
+		rxflags = (status & APBPS2_STATUS_PE) ? SERIO_PARITY : 0;
+		rxflags |= (status & APBPS2_STATUS_FE) ? SERIO_FRAME : 0;
+
+		/* clear error bits? */
+		if (rxflags)
+			iowrite32be(0, &priv->regs->status);
+
+		serio_interrupt(priv->io, data, rxflags);
+
+		ret = IRQ_HANDLED;
+	}
+
+	return ret;
+}
+
+static int apbps2_write(struct serio *io, unsigned char val)
+{
+	struct apbps2_priv *priv = io->port_data;
+	unsigned int tleft = 10000; /* timeout in 100ms */
+
+	/* delay until PS/2 controller has room for more chars */
+	while ((ioread32be(&priv->regs->status) & APBPS2_STATUS_TF) && tleft--)
+		udelay(10);
+
+	if ((ioread32be(&priv->regs->status) & APBPS2_STATUS_TF) == 0) {
+		iowrite32be(val, &priv->regs->data);
+
+		iowrite32be(APBPS2_CTRL_RE | APBPS2_CTRL_RI | APBPS2_CTRL_TE,
+				&priv->regs->ctrl);
+		return 0;
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int apbps2_open(struct serio *io)
+{
+	struct apbps2_priv *priv = io->port_data;
+	int limit;
+	unsigned long tmp;
+
+	/* clear error flags */
+	iowrite32be(0, &priv->regs->status);
+
+	/* Clear old data if available (unlikely) */
+	limit = 1024;
+	while ((ioread32be(&priv->regs->status) & APBPS2_STATUS_DR) && --limit)
+		tmp = ioread32be(&priv->regs->data);
+
+	/* Enable reciever and it's interrupt */
+	iowrite32be(APBPS2_CTRL_RE | APBPS2_CTRL_RI, &priv->regs->ctrl);
+
+	return 0;
+}
+
+static void apbps2_close(struct serio *io)
+{
+	struct apbps2_priv *priv = io->port_data;
+
+	/* stop interrupts at PS/2 HW level */
+	iowrite32be(0, &priv->regs->ctrl);
+}
+
+/* Initialize one APBPS2 PS/2 core */
+static int apbps2_of_probe(struct platform_device *ofdev)
+{
+	struct apbps2_priv *priv;
+	int irq, err;
+	u32 freq_hz;
+	struct resource *res;
+
+	priv = devm_kzalloc(&ofdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		dev_err(&ofdev->dev, "memory allocation failed\n");
+		return -ENOMEM;
+	}
+
+	/* Find Device Address */
+	res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
+	priv->regs = devm_request_and_ioremap(&ofdev->dev, res);
+	if (!priv->regs) {
+		dev_err(&ofdev->dev, "io-regs mapping failed\n");
+		return -EBUSY;
+	}
+
+	/* Reset hardware, disable interrupt */
+	iowrite32be(0, &priv->regs->ctrl);
+
+	/* IRQ */
+	irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
+	err = devm_request_irq(&ofdev->dev, irq, apbps2_isr,
+				IRQF_SHARED, "apbps2", priv);
+	if (err) {
+		dev_err(&ofdev->dev, "request IRQ%d failed\n", irq);
+		return err;
+	}
+
+	/* Get core frequency */
+	if (of_property_read_u32(ofdev->dev.of_node, "freq", &freq_hz)) {
+		dev_err(&ofdev->dev, "unable to get core frequency\n");
+		return -EINVAL;
+	}
+
+	/* Set reload register to core freq in kHz/10 */
+	iowrite32be(freq_hz / 10000, &priv->regs->reload);
+
+	priv->io = kzalloc(sizeof(struct serio), GFP_KERNEL);
+	if (!priv->io)
+		return -ENOMEM;
+
+	priv->io->id.type = SERIO_8042;
+	priv->io->open = apbps2_open;
+	priv->io->close = apbps2_close;
+	priv->io->write = apbps2_write;
+	priv->io->port_data = priv;
+	strlcpy(priv->io->name, "APBPS2 PS/2", sizeof(priv->io->name));
+	snprintf(priv->io->phys, sizeof(priv->io->phys),
+		 "apbps2_%d", apbps2_idx++);
+
+	dev_info(&ofdev->dev, "irq = %d, base = 0x%p\n", irq, priv->regs);
+
+	serio_register_port(priv->io);
+
+	platform_set_drvdata(ofdev, priv);
+
+	return 0;
+}
+
+static int apbps2_of_remove(struct platform_device *of_dev)
+{
+	struct apbps2_priv *priv = platform_get_drvdata(of_dev);
+
+	serio_unregister_port(priv->io);
+
+	return 0;
+}
+
+static struct of_device_id apbps2_of_match[] = {
+	{ .name = "GAISLER_APBPS2", },
+	{ .name = "01_060", },
+	{}
+};
+
+MODULE_DEVICE_TABLE(of, apbps2_of_match);
+
+static struct platform_driver apbps2_of_driver = {
+	.driver = {
+		.name = "grlib-apbps2",
+		.owner = THIS_MODULE,
+		.of_match_table = apbps2_of_match,
+	},
+	.probe = apbps2_of_probe,
+	.remove = apbps2_of_remove,
+};
+
+module_platform_driver(apbps2_of_driver);
+
+MODULE_AUTHOR("Aeroflex Gaisler AB.");
+MODULE_DESCRIPTION("GRLIB APBPS2 PS/2 serial I/O");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/auo-pixcir-ts.c b/drivers/input/touchscreen/auo-pixcir-ts.c
index c6e19a9..d3f9f6b 100644
--- a/drivers/input/touchscreen/auo-pixcir-ts.c
+++ b/drivers/input/touchscreen/auo-pixcir-ts.c
@@ -31,6 +31,8 @@
 #include <linux/delay.h>
 #include <linux/gpio.h>
 #include <linux/input/auo-pixcir-ts.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
 
 /*
  * Coordinate calculation:
@@ -111,6 +113,7 @@
 struct auo_pixcir_ts {
 	struct i2c_client	*client;
 	struct input_dev	*input;
+	const struct auo_pixcir_ts_platdata *pdata;
 	char			phys[32];
 
 	/* special handling for touch_indicate interupt mode */
@@ -132,7 +135,7 @@ static int auo_pixcir_collect_data(struct auo_pixcir_ts *ts,
 				   struct auo_point_t *point)
 {
 	struct i2c_client *client = ts->client;
-	const struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
+	const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
 	uint8_t raw_coord[8];
 	uint8_t raw_area[4];
 	int i, ret;
@@ -178,8 +181,7 @@ static int auo_pixcir_collect_data(struct auo_pixcir_ts *ts,
 static irqreturn_t auo_pixcir_interrupt(int irq, void *dev_id)
 {
 	struct auo_pixcir_ts *ts = dev_id;
-	struct i2c_client *client = ts->client;
-	const struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
+	const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
 	struct auo_point_t point[AUO_PIXCIR_REPORT_POINTS];
 	int i;
 	int ret;
@@ -290,7 +292,7 @@ static int auo_pixcir_int_config(struct auo_pixcir_ts *ts,
 					   int int_setting)
 {
 	struct i2c_client *client = ts->client;
-	struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
+	const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
 	int ret;
 
 	ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_INT_SETTING);
@@ -479,53 +481,105 @@ unlock:
 }
 #endif
 
-static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops, auo_pixcir_suspend,
-			 auo_pixcir_resume);
+static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops,
+			 auo_pixcir_suspend, auo_pixcir_resume);
+
+#ifdef CONFIG_OF
+static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
+{
+	struct auo_pixcir_ts_platdata *pdata;
+	struct device_node *np = dev->of_node;
+
+	if (!np)
+		return ERR_PTR(-ENOENT);
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		dev_err(dev, "failed to allocate platform data\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	pdata->gpio_int = of_get_gpio(np, 0);
+	if (!gpio_is_valid(pdata->gpio_int)) {
+		dev_err(dev, "failed to get interrupt gpio\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	pdata->gpio_rst = of_get_gpio(np, 1);
+	if (!gpio_is_valid(pdata->gpio_rst)) {
+		dev_err(dev, "failed to get reset gpio\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
+		dev_err(dev, "failed to get x-size property\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
+		dev_err(dev, "failed to get y-size property\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	/* default to asserting the interrupt when the screen is touched */
+	pdata->int_setting = AUO_PIXCIR_INT_TOUCH_IND;
+
+	return pdata;
+}
+#else
+static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
+{
+	return ERR_PTR(-EINVAL);
+}
+#endif
+
+static void auo_pixcir_reset(void *data)
+{
+	struct auo_pixcir_ts *ts = data;
+
+	gpio_set_value(ts->pdata->gpio_rst, 0);
+}
 
 static int auo_pixcir_probe(struct i2c_client *client,
-				      const struct i2c_device_id *id)
+			    const struct i2c_device_id *id)
 {
-	const struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
+	const struct auo_pixcir_ts_platdata *pdata;
 	struct auo_pixcir_ts *ts;
 	struct input_dev *input_dev;
-	int ret;
-
-	if (!pdata)
-		return -EINVAL;
+	int version;
+	int error;
+
+	pdata = dev_get_platdata(&client->dev);
+	if (!pdata) {
+		pdata = auo_pixcir_parse_dt(&client->dev);
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
+	}
 
-	ts = kzalloc(sizeof(struct auo_pixcir_ts), GFP_KERNEL);
+	ts = devm_kzalloc(&client->dev,
+			  sizeof(struct auo_pixcir_ts), GFP_KERNEL);
 	if (!ts)
 		return -ENOMEM;
 
-	ret = gpio_request(pdata->gpio_int, "auo_pixcir_ts_int");
-	if (ret) {
-		dev_err(&client->dev, "request of gpio %d failed, %d\n",
-			pdata->gpio_int, ret);
-		goto err_gpio_int;
+	input_dev = devm_input_allocate_device(&client->dev);
+	if (!input_dev) {
+		dev_err(&client->dev, "could not allocate input device\n");
+		return -ENOMEM;
 	}
 
-	if (pdata->init_hw)
-		pdata->init_hw(client);
-
+	ts->pdata = pdata;
 	ts->client = client;
+	ts->input = input_dev;
 	ts->touch_ind_mode = 0;
+	ts->stopped = true;
 	init_waitqueue_head(&ts->wait);
 
 	snprintf(ts->phys, sizeof(ts->phys),
 		 "%s/input0", dev_name(&client->dev));
 
-	input_dev = input_allocate_device();
-	if (!input_dev) {
-		dev_err(&client->dev, "could not allocate input device\n");
-		goto err_input_alloc;
-	}
-
-	ts->input = input_dev;
-
 	input_dev->name = "AUO-Pixcir touchscreen";
 	input_dev->phys = ts->phys;
 	input_dev->id.bustype = BUS_I2C;
-	input_dev->dev.parent = &client->dev;
 
 	input_dev->open = auo_pixcir_input_open;
 	input_dev->close = auo_pixcir_input_close;
@@ -550,70 +604,70 @@ static int auo_pixcir_probe(struct i2c_client *client,
 			     AUO_PIXCIR_MAX_AREA, 0, 0);
 	input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
 
-	ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION);
-	if (ret < 0)
-		goto err_fw_vers;
-	dev_info(&client->dev, "firmware version 0x%X\n", ret);
-
-	ret = auo_pixcir_int_config(ts, pdata->int_setting);
-	if (ret)
-		goto err_fw_vers;
-
 	input_set_drvdata(ts->input, ts);
-	ts->stopped = true;
 
-	ret = request_threaded_irq(client->irq, NULL, auo_pixcir_interrupt,
-				   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
-				   input_dev->name, ts);
-	if (ret) {
-		dev_err(&client->dev, "irq %d requested failed\n", client->irq);
-		goto err_fw_vers;
+	error = devm_gpio_request_one(&client->dev, pdata->gpio_int,
+				      GPIOF_DIR_IN, "auo_pixcir_ts_int");
+	if (error) {
+		dev_err(&client->dev, "request of gpio %d failed, %d\n",
+			pdata->gpio_int, error);
+		return error;
 	}
 
-	/* stop device and put it into deep sleep until it is opened */
-	ret = auo_pixcir_stop(ts);
-	if (ret < 0)
-		goto err_input_register;
-
-	ret = input_register_device(input_dev);
-	if (ret) {
-		dev_err(&client->dev, "could not register input device\n");
-		goto err_input_register;
+	error = devm_gpio_request_one(&client->dev, pdata->gpio_rst,
+				      GPIOF_DIR_OUT | GPIOF_INIT_HIGH,
+				      "auo_pixcir_ts_rst");
+	if (error) {
+		dev_err(&client->dev, "request of gpio %d failed, %d\n",
+			pdata->gpio_rst, error);
+		return error;
 	}
 
-	i2c_set_clientdata(client, ts);
-
-	return 0;
+	error = devm_add_action(&client->dev, auo_pixcir_reset, ts);
+	if (error) {
+		auo_pixcir_reset(ts);
+		dev_err(&client->dev, "failed to register reset action, %d\n",
+			error);
+		return error;
+	}
 
-err_input_register:
-	free_irq(client->irq, ts);
-err_fw_vers:
-	input_free_device(input_dev);
-err_input_alloc:
-	if (pdata->exit_hw)
-		pdata->exit_hw(client);
-	gpio_free(pdata->gpio_int);
-err_gpio_int:
-	kfree(ts);
+	msleep(200);
 
-	return ret;
-}
-
-static int auo_pixcir_remove(struct i2c_client *client)
-{
-	struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
-	const struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
+	version = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION);
+	if (version < 0) {
+		error = version;
+		return error;
+	}
 
-	free_irq(client->irq, ts);
+	dev_info(&client->dev, "firmware version 0x%X\n", version);
 
-	input_unregister_device(ts->input);
+	error = auo_pixcir_int_config(ts, pdata->int_setting);
+	if (error)
+		return error;
 
-	if (pdata->exit_hw)
-		pdata->exit_hw(client);
+	error = devm_request_threaded_irq(&client->dev, client->irq,
+					  NULL, auo_pixcir_interrupt,
+					  IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					  input_dev->name, ts);
+	if (error) {
+		dev_err(&client->dev, "irq %d requested failed, %d\n",
+			client->irq, error);
+		return error;
+	}
 
-	gpio_free(pdata->gpio_int);
+	/* stop device and put it into deep sleep until it is opened */
+	error = auo_pixcir_stop(ts);
+	if (error)
+		return error;
+
+	error = input_register_device(input_dev);
+	if (error) {
+		dev_err(&client->dev, "could not register input device, %d\n",
+			error);
+		return error;
+	}
 
-	kfree(ts);
+	i2c_set_clientdata(client, ts);
 
 	return 0;
 }
@@ -624,14 +678,22 @@ static const struct i2c_device_id auo_pixcir_idtable[] = {
 };
 MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
 
+#ifdef CONFIG_OF
+static struct of_device_id auo_pixcir_ts_dt_idtable[] = {
+	{ .compatible = "auo,auo_pixcir_ts" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, auo_pixcir_ts_dt_idtable);
+#endif
+
 static struct i2c_driver auo_pixcir_driver = {
 	.driver = {
 		.owner	= THIS_MODULE,
 		.name	= "auo_pixcir_ts",
 		.pm	= &auo_pixcir_pm_ops,
+		.of_match_table	= of_match_ptr(auo_pixcir_ts_dt_idtable),
 	},
 	.probe		= auo_pixcir_probe,
-	.remove		= auo_pixcir_remove,
 	.id_table	= auo_pixcir_idtable,
 };
 
diff --git a/drivers/input/touchscreen/wm9712.c b/drivers/input/touchscreen/wm9712.c
index 6e743e3..16b5211 100644
--- a/drivers/input/touchscreen/wm9712.c
+++ b/drivers/input/touchscreen/wm9712.c
@@ -162,14 +162,14 @@ static void wm9712_phy_init(struct wm97xx *wm)
 	if (rpu) {
 		dig2 &= 0xffc0;
 		dig2 |= WM9712_RPU(rpu);
-		dev_dbg(wm->dev, "setting pen detect pull-up to %d Ohms",
+		dev_dbg(wm->dev, "setting pen detect pull-up to %d Ohms\n",
 			64000 / rpu);
 	}
 
 	/* WM9712 five wire */
 	if (five_wire) {
 		dig2 |= WM9712_45W;
-		dev_dbg(wm->dev, "setting 5-wire touchscreen mode.");
+		dev_dbg(wm->dev, "setting 5-wire touchscreen mode.\n");
 
 		if (pil) {
 			dev_warn(wm->dev, "pressure measurement is not "
@@ -182,21 +182,21 @@ static void wm9712_phy_init(struct wm97xx *wm)
 	if (pil == 2) {
 		dig2 |= WM9712_PIL;
 		dev_dbg(wm->dev,
-			"setting pressure measurement current to 400uA.");
+			"setting pressure measurement current to 400uA.\n");
 	} else if (pil)
 		dev_dbg(wm->dev,
-			"setting pressure measurement current to 200uA.");
+			"setting pressure measurement current to 200uA.\n");
 	if (!pil)
 		pressure = 0;
 
 	/* polling mode sample settling delay */
 	if (delay < 0 || delay > 15) {
-		dev_dbg(wm->dev, "supplied delay out of range.");
+		dev_dbg(wm->dev, "supplied delay out of range.\n");
 		delay = 4;
 	}
 	dig1 &= 0xff0f;
 	dig1 |= WM97XX_DELAY(delay);
-	dev_dbg(wm->dev, "setting adc sample delay to %d u Secs.",
+	dev_dbg(wm->dev, "setting adc sample delay to %d u Secs.\n",
 		delay_table[delay]);
 
 	/* mask */
@@ -285,7 +285,7 @@ static int wm9712_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
 		if (is_pden(wm))
 			wm->pen_probably_down = 0;
 		else
-			dev_dbg(wm->dev, "adc sample timeout");
+			dev_dbg(wm->dev, "adc sample timeout\n");
 		return RC_PENUP;
 	}
 
@@ -295,15 +295,19 @@ static int wm9712_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
 
 	/* check we have correct sample */
 	if ((*sample ^ adcsel) & WM97XX_ADCSEL_MASK) {
-		dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x",
+		dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x\n",
 			adcsel & WM97XX_ADCSEL_MASK,
 			*sample & WM97XX_ADCSEL_MASK);
-		return RC_PENUP;
+		return RC_AGAIN;
 	}
 
 	if (wants_pen && !(*sample & WM97XX_PEN_DOWN)) {
-		wm->pen_probably_down = 0;
-		return RC_PENUP;
+		/* Sometimes it reads a wrong value the first time. */
+		*sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+		if (!(*sample & WM97XX_PEN_DOWN)) {
+			wm->pen_probably_down = 0;
+			return RC_PENUP;
+		}
 	}
 
 	return RC_VALID;
@@ -345,7 +349,7 @@ static int wm9712_poll_coord(struct wm97xx *wm, struct wm97xx_data *data)
 		if (is_pden(wm))
 			wm->pen_probably_down = 0;
 		else
-			dev_dbg(wm->dev, "adc sample timeout");
+			dev_dbg(wm->dev, "adc sample timeout\n");
 		return RC_PENUP;
 	}
 
diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c
index 5dbe73a..7e45c9f 100644
--- a/drivers/input/touchscreen/wm97xx-core.c
+++ b/drivers/input/touchscreen/wm97xx-core.c
@@ -442,6 +442,16 @@ static int wm97xx_read_samples(struct wm97xx *wm)
 			"pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
 			data.x >> 12, data.x & 0xfff, data.y >> 12,
 			data.y & 0xfff, data.p >> 12, data.p & 0xfff);
+
+		if (abs_x[0] > (data.x & 0xfff) ||
+		    abs_x[1] < (data.x & 0xfff) ||
+		    abs_y[0] > (data.y & 0xfff) ||
+		    abs_y[1] < (data.y & 0xfff)) {
+			dev_dbg(wm->dev, "Measurement out of range, dropping it\n");
+			rc = RC_AGAIN;
+			goto out;
+		}
+
 		input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
 		input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
 		input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
@@ -455,6 +465,7 @@ static int wm97xx_read_samples(struct wm97xx *wm)
 		wm->ts_reader_interval = wm->ts_reader_min_interval;
 	}
 
+out:
 	mutex_unlock(&wm->codec_mutex);
 	return rc;
 }
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 8ac25ad..cb8ef3e 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -980,6 +980,10 @@ static int acm_probe(struct usb_interface *intf,
 
 	/* normal quirks */
 	quirks = (unsigned long)id->driver_info;
+
+	if (quirks == IGNORE_DEVICE)
+		return -ENODEV;
+
 	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
 
 	/* handle quirks deadly to normal probing*/
@@ -1684,6 +1688,15 @@ static const struct usb_device_id acm_ids[] = {
 	.driver_info = NO_DATA_INTERFACE,
 	},
 
+#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
+	{ USB_DEVICE(0x04d8, 0x0082),	/* Application mode */
+	.driver_info = IGNORE_DEVICE,
+	},
+	{ USB_DEVICE(0x04d8, 0x0083),	/* Bootloader mode */
+	.driver_info = IGNORE_DEVICE,
+	},
+#endif
+
 	/* control interfaces without any protocol set */
 	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
 		USB_CDC_PROTO_NONE) },
diff --git a/drivers/usb/class/cdc-acm.h b/drivers/usb/class/cdc-acm.h
index 35ef887..0f76e4a 100644
--- a/drivers/usb/class/cdc-acm.h
+++ b/drivers/usb/class/cdc-acm.h
@@ -128,3 +128,4 @@ struct acm {
 #define NO_CAP_LINE			4
 #define NOT_A_MODEM			8
 #define NO_DATA_INTERFACE		16
+#define IGNORE_DEVICE			32
diff --git a/include/linux/device.h b/include/linux/device.h
index 9d6464e..4fd899b 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -578,6 +578,10 @@ void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
 void __iomem *devm_request_and_ioremap(struct device *dev,
 			struct resource *res);
 
+/* allows to add/remove a custom action to devres stack */
+int devm_add_action(struct device *dev, void (*action)(void *), void *data);
+void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
+
 struct device_dma_parameters {
 	/*
 	 * a low level driver may set these to teach IOMMU code about
diff --git a/include/linux/input/auo-pixcir-ts.h b/include/linux/input/auo-pixcir-ts.h
index 75d4be7..5049f21 100644
--- a/include/linux/input/auo-pixcir-ts.h
+++ b/include/linux/input/auo-pixcir-ts.h
@@ -43,12 +43,10 @@
  */
 struct auo_pixcir_ts_platdata {
 	int gpio_int;
+	int gpio_rst;
 
 	int int_setting;
 
-	void (*init_hw)(struct i2c_client *);
-	void (*exit_hw)(struct i2c_client *);
-
 	unsigned int x_max;
 	unsigned int y_max;
 };
diff --git a/include/uapi/linux/input.h b/include/uapi/linux/input.h
index 935119c..4649ee3 100644
--- a/include/uapi/linux/input.h
+++ b/include/uapi/linux/input.h
@@ -702,6 +702,11 @@ struct input_keymap_entry {
 #define KEY_CAMERA_LEFT		0x219
 #define KEY_CAMERA_RIGHT	0x21a
 
+#define KEY_ATTENDANT_ON	0x21b
+#define KEY_ATTENDANT_OFF	0x21c
+#define KEY_ATTENDANT_TOGGLE	0x21d	/* Attendant call on or off */
+#define KEY_LIGHTS_TOGGLE	0x21e	/* Reading light on or off */
+
 #define BTN_TRIGGER_HAPPY		0x2c0
 #define BTN_TRIGGER_HAPPY1		0x2c0
 #define BTN_TRIGGER_HAPPY2		0x2c1