Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 1398 insertions, 0 deletions

diff --git a/kernel/drivers/input/mouse/cyapa.c b/kernel/drivers/input/mouse/cyapa.c
new file mode 100644
index 000000000..efe148474
--- /dev/null
+++ b/kernel/drivers/input/mouse/cyapa.c
@@ -0,0 +1,1398 @@
+/*
+ * Cypress APA trackpad with I2C interface
+ *
+ * Author: Dudley Du <dudl@cypress.com>
+ * Further cleanup and restructuring by:
+ *   Daniel Kurtz <djkurtz@chromium.org>
+ *   Benson Leung <bleung@chromium.org>
+ *
+ * Copyright (C) 2011-2014 Cypress Semiconductor, Inc.
+ * Copyright (C) 2011-2012 Google, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/pm_runtime.h>
+#include <linux/acpi.h>
+#include "cyapa.h"
+
+
+#define CYAPA_ADAPTER_FUNC_NONE   0
+#define CYAPA_ADAPTER_FUNC_I2C    1
+#define CYAPA_ADAPTER_FUNC_SMBUS  2
+#define CYAPA_ADAPTER_FUNC_BOTH   3
+
+#define CYAPA_FW_NAME		"cyapa.bin"
+
+const char product_id[] = "CYTRA";
+
+static int cyapa_reinitialize(struct cyapa *cyapa);
+
+static inline bool cyapa_is_bootloader_mode(struct cyapa *cyapa)
+{
+	if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_BL)
+		return true;
+
+	if (cyapa->gen == CYAPA_GEN3 &&
+		cyapa->state >= CYAPA_STATE_BL_BUSY &&
+		cyapa->state <= CYAPA_STATE_BL_ACTIVE)
+		return true;
+
+	return false;
+}
+
+static inline bool cyapa_is_operational_mode(struct cyapa *cyapa)
+{
+	if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_APP)
+		return true;
+
+	if (cyapa->gen == CYAPA_GEN3 && cyapa->state == CYAPA_STATE_OP)
+		return true;
+
+	return false;
+}
+
+/* Returns 0 on success, else negative errno on failure. */
+static ssize_t cyapa_i2c_read(struct cyapa *cyapa, u8 reg, size_t len,
+					u8 *values)
+{
+	struct i2c_client *client = cyapa->client;
+	struct i2c_msg msgs[] = {
+		{
+			.addr = client->addr,
+			.flags = 0,
+			.len = 1,
+			.buf = &reg,
+		},
+		{
+			.addr = client->addr,
+			.flags = I2C_M_RD,
+			.len = len,
+			.buf = values,
+		},
+	};
+	int ret;
+
+	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+
+	if (ret != ARRAY_SIZE(msgs))
+		return ret < 0 ? ret : -EIO;
+
+	return 0;
+}
+
+/**
+ * cyapa_i2c_write - Execute i2c block data write operation
+ * @cyapa: Handle to this driver
+ * @ret: Offset of the data to written in the register map
+ * @len: number of bytes to write
+ * @values: Data to be written
+ *
+ * Return negative errno code on error; return zero when success.
+ */
+static int cyapa_i2c_write(struct cyapa *cyapa, u8 reg,
+					 size_t len, const void *values)
+{
+	struct i2c_client *client = cyapa->client;
+	char buf[32];
+	int ret;
+
+	if (len > sizeof(buf) - 1)
+		return -ENOMEM;
+
+	buf[0] = reg;
+	memcpy(&buf[1], values, len);
+
+	ret = i2c_master_send(client, buf, len + 1);
+	if (ret != len + 1)
+		return ret < 0 ? ret : -EIO;
+
+	return 0;
+}
+
+static u8 cyapa_check_adapter_functionality(struct i2c_client *client)
+{
+	u8 ret = CYAPA_ADAPTER_FUNC_NONE;
+
+	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+		ret |= CYAPA_ADAPTER_FUNC_I2C;
+	if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
+				     I2C_FUNC_SMBUS_BLOCK_DATA |
+				     I2C_FUNC_SMBUS_I2C_BLOCK))
+		ret |= CYAPA_ADAPTER_FUNC_SMBUS;
+	return ret;
+}
+
+/*
+ * Query device for its current operating state.
+ */
+static int cyapa_get_state(struct cyapa *cyapa)
+{
+	u8 status[BL_STATUS_SIZE];
+	u8 cmd[32];
+	/* The i2c address of gen4 and gen5 trackpad device must be even. */
+	bool even_addr = ((cyapa->client->addr & 0x0001) == 0);
+	bool smbus = false;
+	int retries = 2;
+	int error;
+
+	cyapa->state = CYAPA_STATE_NO_DEVICE;
+
+	/*
+	 * Get trackpad status by reading 3 registers starting from 0.
+	 * If the device is in the bootloader, this will be BL_HEAD.
+	 * If the device is in operation mode, this will be the DATA regs.
+	 *
+	 */
+	error = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET, BL_STATUS_SIZE,
+				       status);
+
+	/*
+	 * On smbus systems in OP mode, the i2c_reg_read will fail with
+	 * -ETIMEDOUT.  In this case, try again using the smbus equivalent
+	 * command.  This should return a BL_HEAD indicating CYAPA_STATE_OP.
+	 */
+	if (cyapa->smbus && (error == -ETIMEDOUT || error == -ENXIO)) {
+		if (!even_addr)
+			error = cyapa_read_block(cyapa,
+					CYAPA_CMD_BL_STATUS, status);
+		smbus = true;
+	}
+
+	if (error != BL_STATUS_SIZE)
+		goto error;
+
+	/*
+	 * Detect trackpad protocol based on characteristic registers and bits.
+	 */
+	do {
+		cyapa->status[REG_OP_STATUS] = status[REG_OP_STATUS];
+		cyapa->status[REG_BL_STATUS] = status[REG_BL_STATUS];
+		cyapa->status[REG_BL_ERROR] = status[REG_BL_ERROR];
+
+		if (cyapa->gen == CYAPA_GEN_UNKNOWN ||
+				cyapa->gen == CYAPA_GEN3) {
+			error = cyapa_gen3_ops.state_parse(cyapa,
+					status, BL_STATUS_SIZE);
+			if (!error)
+				goto out_detected;
+		}
+		if ((cyapa->gen == CYAPA_GEN_UNKNOWN ||
+				cyapa->gen == CYAPA_GEN5) &&
+			!smbus && even_addr) {
+			error = cyapa_gen5_ops.state_parse(cyapa,
+					status, BL_STATUS_SIZE);
+			if (!error)
+				goto out_detected;
+		}
+
+		/*
+		 * Write 0x00 0x00 to trackpad device to force update its
+		 * status, then redo the detection again.
+		 */
+		if (!smbus) {
+			cmd[0] = 0x00;
+			cmd[1] = 0x00;
+			error = cyapa_i2c_write(cyapa, 0, 2, cmd);
+			if (error)
+				goto error;
+
+			msleep(50);
+
+			error = cyapa_i2c_read(cyapa, BL_HEAD_OFFSET,
+					BL_STATUS_SIZE, status);
+			if (error)
+				goto error;
+		}
+	} while (--retries > 0 && !smbus);
+
+	goto error;
+
+out_detected:
+	if (cyapa->state <= CYAPA_STATE_BL_BUSY)
+		return -EAGAIN;
+	return 0;
+
+error:
+	return (error < 0) ? error : -EAGAIN;
+}
+
+/*
+ * Poll device for its status in a loop, waiting up to timeout for a response.
+ *
+ * When the device switches state, it usually takes ~300 ms.
+ * However, when running a new firmware image, the device must calibrate its
+ * sensors, which can take as long as 2 seconds.
+ *
+ * Note: The timeout has granularity of the polling rate, which is 100 ms.
+ *
+ * Returns:
+ *   0 when the device eventually responds with a valid non-busy state.
+ *   -ETIMEDOUT if device never responds (too many -EAGAIN)
+ *   -EAGAIN    if bootload is busy, or unknown state.
+ *   < 0        other errors
+ */
+int cyapa_poll_state(struct cyapa *cyapa, unsigned int timeout)
+{
+	int error;
+	int tries = timeout / 100;
+
+	do {
+		error = cyapa_get_state(cyapa);
+		if (!error && cyapa->state > CYAPA_STATE_BL_BUSY)
+			return 0;
+
+		msleep(100);
+	} while (tries--);
+
+	return (error == -EAGAIN || error == -ETIMEDOUT) ? -ETIMEDOUT : error;
+}
+
+/*
+ * Check if device is operational.
+ *
+ * An operational device is responding, has exited bootloader, and has
+ * firmware supported by this driver.
+ *
+ * Returns:
+ *   -ENODEV no device
+ *   -EBUSY  no device or in bootloader
+ *   -EIO    failure while reading from device
+ *   -ETIMEDOUT timeout failure for bus idle or bus no response
+ *   -EAGAIN device is still in bootloader
+ *           if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware
+ *   -EINVAL device is in operational mode, but not supported by this driver
+ *   0       device is supported
+ */
+static int cyapa_check_is_operational(struct cyapa *cyapa)
+{
+	int error;
+
+	error = cyapa_poll_state(cyapa, 4000);
+	if (error)
+		return error;
+
+	switch (cyapa->gen) {
+	case CYAPA_GEN5:
+		cyapa->ops = &cyapa_gen5_ops;
+		break;
+	case CYAPA_GEN3:
+		cyapa->ops = &cyapa_gen3_ops;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	error = cyapa->ops->operational_check(cyapa);
+	if (!error && cyapa_is_operational_mode(cyapa))
+		cyapa->operational = true;
+	else
+		cyapa->operational = false;
+
+	return error;
+}
+
+
+/*
+ * Returns 0 on device detected, negative errno on no device detected.
+ * And when the device is detected and opertaional, it will be reset to
+ * full power active mode automatically.
+ */
+static int cyapa_detect(struct cyapa *cyapa)
+{
+	struct device *dev = &cyapa->client->dev;
+	int error;
+
+	error = cyapa_check_is_operational(cyapa);
+	if (error) {
+		if (error != -ETIMEDOUT && error != -ENODEV &&
+			cyapa_is_bootloader_mode(cyapa)) {
+			dev_warn(dev, "device detected but not operational\n");
+			return 0;
+		}
+
+		dev_err(dev, "no device detected: %d\n", error);
+		return error;
+	}
+
+	return 0;
+}
+
+static int cyapa_open(struct input_dev *input)
+{
+	struct cyapa *cyapa = input_get_drvdata(input);
+	struct i2c_client *client = cyapa->client;
+	int error;
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error)
+		return error;
+
+	if (cyapa->operational) {
+		/*
+		 * though failed to set active power mode,
+		 * but still may be able to work in lower scan rate
+		 * when in operational mode.
+		 */
+		error = cyapa->ops->set_power_mode(cyapa,
+				PWR_MODE_FULL_ACTIVE, 0);
+		if (error) {
+			dev_warn(&client->dev,
+				"set active power failed: %d\n", error);
+			goto out;
+		}
+	} else {
+		error = cyapa_reinitialize(cyapa);
+		if (error || !cyapa->operational) {
+			error = error ? error : -EAGAIN;
+			goto out;
+		}
+	}
+
+	enable_irq(client->irq);
+	if (!pm_runtime_enabled(&client->dev)) {
+		pm_runtime_set_active(&client->dev);
+		pm_runtime_enable(&client->dev);
+	}
+out:
+	mutex_unlock(&cyapa->state_sync_lock);
+	return error;
+}
+
+static void cyapa_close(struct input_dev *input)
+{
+	struct cyapa *cyapa = input_get_drvdata(input);
+	struct i2c_client *client = cyapa->client;
+
+	mutex_lock(&cyapa->state_sync_lock);
+
+	disable_irq(client->irq);
+	if (pm_runtime_enabled(&client->dev))
+		pm_runtime_disable(&client->dev);
+	pm_runtime_set_suspended(&client->dev);
+
+	if (cyapa->operational)
+		cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
+
+	mutex_unlock(&cyapa->state_sync_lock);
+}
+
+static int cyapa_create_input_dev(struct cyapa *cyapa)
+{
+	struct device *dev = &cyapa->client->dev;
+	struct input_dev *input;
+	int error;
+
+	if (!cyapa->physical_size_x || !cyapa->physical_size_y)
+		return -EINVAL;
+
+	input = devm_input_allocate_device(dev);
+	if (!input) {
+		dev_err(dev, "failed to allocate memory for input device.\n");
+		return -ENOMEM;
+	}
+
+	input->name = CYAPA_NAME;
+	input->phys = cyapa->phys;
+	input->id.bustype = BUS_I2C;
+	input->id.version = 1;
+	input->id.product = 0;  /* Means any product in eventcomm. */
+	input->dev.parent = &cyapa->client->dev;
+
+	input->open = cyapa_open;
+	input->close = cyapa_close;
+
+	input_set_drvdata(input, cyapa);
+
+	__set_bit(EV_ABS, input->evbit);
+
+	/* Finger position */
+	input_set_abs_params(input, ABS_MT_POSITION_X, 0, cyapa->max_abs_x, 0,
+			     0);
+	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cyapa->max_abs_y, 0,
+			     0);
+	input_set_abs_params(input, ABS_MT_PRESSURE, 0, cyapa->max_z, 0, 0);
+	if (cyapa->gen > CYAPA_GEN3) {
+		input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+		input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
+		/*
+		 * Orientation is the angle between the vertical axis and
+		 * the major axis of the contact ellipse.
+		 * The range is -127 to 127.
+		 * the positive direction is clockwise form the vertical axis.
+		 * If the ellipse of contact degenerates into a circle,
+		 * orientation is reported as 0.
+		 *
+		 * Also, for Gen5 trackpad the accurate of this orientation
+		 * value is value + (-30 ~ 30).
+		 */
+		input_set_abs_params(input, ABS_MT_ORIENTATION,
+				-127, 127, 0, 0);
+	}
+	if (cyapa->gen >= CYAPA_GEN5) {
+		input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
+		input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 255, 0, 0);
+	}
+
+	input_abs_set_res(input, ABS_MT_POSITION_X,
+			  cyapa->max_abs_x / cyapa->physical_size_x);
+	input_abs_set_res(input, ABS_MT_POSITION_Y,
+			  cyapa->max_abs_y / cyapa->physical_size_y);
+
+	if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
+		__set_bit(BTN_LEFT, input->keybit);
+	if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
+		__set_bit(BTN_MIDDLE, input->keybit);
+	if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
+		__set_bit(BTN_RIGHT, input->keybit);
+
+	if (cyapa->btn_capability == CAPABILITY_LEFT_BTN_MASK)
+		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
+
+	/* Handle pointer emulation and unused slots in core */
+	error = input_mt_init_slots(input, CYAPA_MAX_MT_SLOTS,
+				    INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
+	if (error) {
+		dev_err(dev, "failed to initialize MT slots: %d\n", error);
+		return error;
+	}
+
+	/* Register the device in input subsystem */
+	error = input_register_device(input);
+	if (error) {
+		dev_err(dev, "failed to register input device: %d\n", error);
+		return error;
+	}
+
+	cyapa->input = input;
+	return 0;
+}
+
+static void cyapa_enable_irq_for_cmd(struct cyapa *cyapa)
+{
+	struct input_dev *input = cyapa->input;
+
+	if (!input || !input->users) {
+		/*
+		 * When input is NULL, TP must be in deep sleep mode.
+		 * In this mode, later non-power I2C command will always failed
+		 * if not bring it out of deep sleep mode firstly,
+		 * so must command TP to active mode here.
+		 */
+		if (!input || cyapa->operational)
+			cyapa->ops->set_power_mode(cyapa,
+				PWR_MODE_FULL_ACTIVE, 0);
+		/* Gen3 always using polling mode for command. */
+		if (cyapa->gen >= CYAPA_GEN5)
+			enable_irq(cyapa->client->irq);
+	}
+}
+
+static void cyapa_disable_irq_for_cmd(struct cyapa *cyapa)
+{
+	struct input_dev *input = cyapa->input;
+
+	if (!input || !input->users) {
+		if (cyapa->gen >= CYAPA_GEN5)
+			disable_irq(cyapa->client->irq);
+		if (!input || cyapa->operational)
+			cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
+	}
+}
+
+/*
+ * cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time
+ *
+ * These are helper functions that convert to and from integer idle
+ * times and register settings to write to the PowerMode register.
+ * The trackpad supports between 20ms to 1000ms scan intervals.
+ * The time will be increased in increments of 10ms from 20ms to 100ms.
+ * From 100ms to 1000ms, time will be increased in increments of 20ms.
+ *
+ * When Idle_Time < 100, the format to convert Idle_Time to Idle_Command is:
+ *   Idle_Command = Idle Time / 10;
+ * When Idle_Time >= 100, the format to convert Idle_Time to Idle_Command is:
+ *   Idle_Command = Idle Time / 20 + 5;
+ */
+u8 cyapa_sleep_time_to_pwr_cmd(u16 sleep_time)
+{
+	u16 encoded_time;
+
+	sleep_time = clamp_val(sleep_time, 20, 1000);
+	encoded_time = sleep_time < 100 ? sleep_time / 10 : sleep_time / 20 + 5;
+	return (encoded_time << 2) & PWR_MODE_MASK;
+}
+
+u16 cyapa_pwr_cmd_to_sleep_time(u8 pwr_mode)
+{
+	u8 encoded_time = pwr_mode >> 2;
+
+	return (encoded_time < 10) ? encoded_time * 10
+				   : (encoded_time - 5) * 20;
+}
+
+/* 0 on driver initialize and detected successfully, negative on failure. */
+static int cyapa_initialize(struct cyapa *cyapa)
+{
+	int error = 0;
+
+	cyapa->state = CYAPA_STATE_NO_DEVICE;
+	cyapa->gen = CYAPA_GEN_UNKNOWN;
+	mutex_init(&cyapa->state_sync_lock);
+
+	/*
+	 * Set to hard code default, they will be updated with trackpad set
+	 * default values after probe and initialized.
+	 */
+	cyapa->suspend_power_mode = PWR_MODE_SLEEP;
+	cyapa->suspend_sleep_time =
+		cyapa_pwr_cmd_to_sleep_time(cyapa->suspend_power_mode);
+
+	/* ops.initialize() is aimed to prepare for module communications. */
+	error = cyapa_gen3_ops.initialize(cyapa);
+	if (!error)
+		error = cyapa_gen5_ops.initialize(cyapa);
+	if (error)
+		return error;
+
+	error = cyapa_detect(cyapa);
+	if (error)
+		return error;
+
+	/* Power down the device until we need it. */
+	if (cyapa->operational)
+		cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
+
+	return 0;
+}
+
+static int cyapa_reinitialize(struct cyapa *cyapa)
+{
+	struct device *dev = &cyapa->client->dev;
+	struct input_dev *input = cyapa->input;
+	int error;
+
+	if (pm_runtime_enabled(dev))
+		pm_runtime_disable(dev);
+
+	/* Avoid command failures when TP was in OFF state. */
+	if (cyapa->operational)
+		cyapa->ops->set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE, 0);
+
+	error = cyapa_detect(cyapa);
+	if (error)
+		goto out;
+
+	if (!input && cyapa->operational) {
+		error = cyapa_create_input_dev(cyapa);
+		if (error) {
+			dev_err(dev, "create input_dev instance failed: %d\n",
+					error);
+			goto out;
+		}
+	}
+
+out:
+	if (!input || !input->users) {
+		/* Reset to power OFF state to save power when no user open. */
+		if (cyapa->operational)
+			cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
+	} else if (!error && cyapa->operational) {
+		/*
+		 * Make sure only enable runtime PM when device is
+		 * in operational mode and input->users > 0.
+		 */
+		pm_runtime_set_active(dev);
+		pm_runtime_enable(dev);
+	}
+
+	return error;
+}
+
+static irqreturn_t cyapa_irq(int irq, void *dev_id)
+{
+	struct cyapa *cyapa = dev_id;
+	struct device *dev = &cyapa->client->dev;
+
+	pm_runtime_get_sync(dev);
+	if (device_may_wakeup(dev))
+		pm_wakeup_event(dev, 0);
+
+	/* Interrupt event maybe cuased by host command to trackpad device. */
+	if (cyapa->ops->irq_cmd_handler(cyapa)) {
+		/*
+		 * Interrupt event maybe from trackpad device input reporting.
+		 */
+		if (!cyapa->input) {
+			/*
+			 * Still in probling or in firware image
+			 * udpating or reading.
+			 */
+			cyapa->ops->sort_empty_output_data(cyapa,
+					NULL, NULL, NULL);
+			goto out;
+		}
+
+		if (!cyapa->operational || cyapa->ops->irq_handler(cyapa)) {
+			if (!mutex_trylock(&cyapa->state_sync_lock)) {
+				cyapa->ops->sort_empty_output_data(cyapa,
+					NULL, NULL, NULL);
+				goto out;
+			}
+			cyapa_reinitialize(cyapa);
+			mutex_unlock(&cyapa->state_sync_lock);
+		}
+	}
+
+out:
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_sync_autosuspend(dev);
+	return IRQ_HANDLED;
+}
+
+/*
+ **************************************************************
+ * sysfs interface
+ **************************************************************
+*/
+#ifdef CONFIG_PM_SLEEP
+static ssize_t cyapa_show_suspend_scanrate(struct device *dev,
+					   struct device_attribute *attr,
+					   char *buf)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	u8 pwr_cmd = cyapa->suspend_power_mode;
+	u16 sleep_time;
+	int len;
+	int error;
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error)
+		return error;
+
+	pwr_cmd = cyapa->suspend_power_mode;
+	sleep_time = cyapa->suspend_sleep_time;
+
+	mutex_unlock(&cyapa->state_sync_lock);
+
+	switch (pwr_cmd) {
+	case PWR_MODE_BTN_ONLY:
+		len = scnprintf(buf, PAGE_SIZE, "%s\n", BTN_ONLY_MODE_NAME);
+		break;
+
+	case PWR_MODE_OFF:
+		len = scnprintf(buf, PAGE_SIZE, "%s\n", OFF_MODE_NAME);
+		break;
+
+	default:
+		len = scnprintf(buf, PAGE_SIZE, "%u\n",
+				cyapa->gen == CYAPA_GEN3 ?
+					cyapa_pwr_cmd_to_sleep_time(pwr_cmd) :
+					sleep_time);
+		break;
+	}
+
+	return len;
+}
+
+static ssize_t cyapa_update_suspend_scanrate(struct device *dev,
+					     struct device_attribute *attr,
+					     const char *buf, size_t count)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	u16 sleep_time;
+	int error;
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error)
+		return error;
+
+	if (sysfs_streq(buf, BTN_ONLY_MODE_NAME)) {
+		cyapa->suspend_power_mode = PWR_MODE_BTN_ONLY;
+	} else if (sysfs_streq(buf, OFF_MODE_NAME)) {
+		cyapa->suspend_power_mode = PWR_MODE_OFF;
+	} else if (!kstrtou16(buf, 10, &sleep_time)) {
+		cyapa->suspend_sleep_time = min_t(u16, sleep_time, 1000);
+		cyapa->suspend_power_mode =
+			cyapa_sleep_time_to_pwr_cmd(cyapa->suspend_sleep_time);
+	} else {
+		count = -EINVAL;
+	}
+
+	mutex_unlock(&cyapa->state_sync_lock);
+
+	return count;
+}
+
+static DEVICE_ATTR(suspend_scanrate_ms, S_IRUGO|S_IWUSR,
+		   cyapa_show_suspend_scanrate,
+		   cyapa_update_suspend_scanrate);
+
+static struct attribute *cyapa_power_wakeup_entries[] = {
+	&dev_attr_suspend_scanrate_ms.attr,
+	NULL,
+};
+
+static const struct attribute_group cyapa_power_wakeup_group = {
+	.name = power_group_name,
+	.attrs = cyapa_power_wakeup_entries,
+};
+
+static void cyapa_remove_power_wakeup_group(void *data)
+{
+	struct cyapa *cyapa = data;
+
+	sysfs_unmerge_group(&cyapa->client->dev.kobj,
+				&cyapa_power_wakeup_group);
+}
+
+static int cyapa_prepare_wakeup_controls(struct cyapa *cyapa)
+{
+	struct i2c_client *client = cyapa->client;
+	struct device *dev = &client->dev;
+	int error;
+
+	if (device_can_wakeup(dev)) {
+		error = sysfs_merge_group(&client->dev.kobj,
+					&cyapa_power_wakeup_group);
+		if (error) {
+			dev_err(dev, "failed to add power wakeup group: %d\n",
+				error);
+			return error;
+		}
+
+		error = devm_add_action(dev,
+				cyapa_remove_power_wakeup_group, cyapa);
+		if (error) {
+			cyapa_remove_power_wakeup_group(cyapa);
+			dev_err(dev, "failed to add power cleanup action: %d\n",
+				error);
+			return error;
+		}
+	}
+
+	return 0;
+}
+#else
+static inline int cyapa_prepare_wakeup_controls(struct cyapa *cyapa)
+{
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM
+static ssize_t cyapa_show_rt_suspend_scanrate(struct device *dev,
+					      struct device_attribute *attr,
+					      char *buf)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	u8 pwr_cmd;
+	u16 sleep_time;
+	int error;
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error)
+		return error;
+
+	pwr_cmd = cyapa->runtime_suspend_power_mode;
+	sleep_time = cyapa->runtime_suspend_sleep_time;
+
+	mutex_unlock(&cyapa->state_sync_lock);
+
+	return scnprintf(buf, PAGE_SIZE, "%u\n",
+			 cyapa->gen == CYAPA_GEN3 ?
+				cyapa_pwr_cmd_to_sleep_time(pwr_cmd) :
+				sleep_time);
+}
+
+static ssize_t cyapa_update_rt_suspend_scanrate(struct device *dev,
+						struct device_attribute *attr,
+						const char *buf, size_t count)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	u16 time;
+	int error;
+
+	if (buf == NULL || count == 0 || kstrtou16(buf, 10, &time)) {
+		dev_err(dev, "invalid runtime suspend scanrate ms parameter\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * When the suspend scanrate is changed, pm_runtime_get to resume
+	 * a potentially suspended device, update to the new pwr_cmd
+	 * and then pm_runtime_put to suspend into the new power mode.
+	 */
+	pm_runtime_get_sync(dev);
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error)
+		return error;
+
+	cyapa->runtime_suspend_sleep_time = min_t(u16, time, 1000);
+	cyapa->runtime_suspend_power_mode =
+		cyapa_sleep_time_to_pwr_cmd(cyapa->runtime_suspend_sleep_time);
+
+	mutex_unlock(&cyapa->state_sync_lock);
+
+	pm_runtime_put_sync_autosuspend(dev);
+
+	return count;
+}
+
+static DEVICE_ATTR(runtime_suspend_scanrate_ms, S_IRUGO|S_IWUSR,
+		   cyapa_show_rt_suspend_scanrate,
+		   cyapa_update_rt_suspend_scanrate);
+
+static struct attribute *cyapa_power_runtime_entries[] = {
+	&dev_attr_runtime_suspend_scanrate_ms.attr,
+	NULL,
+};
+
+static const struct attribute_group cyapa_power_runtime_group = {
+	.name = power_group_name,
+	.attrs = cyapa_power_runtime_entries,
+};
+
+static void cyapa_remove_power_runtime_group(void *data)
+{
+	struct cyapa *cyapa = data;
+
+	sysfs_unmerge_group(&cyapa->client->dev.kobj,
+				&cyapa_power_runtime_group);
+}
+
+static int cyapa_start_runtime(struct cyapa *cyapa)
+{
+	struct device *dev = &cyapa->client->dev;
+	int error;
+
+	cyapa->runtime_suspend_power_mode = PWR_MODE_IDLE;
+	cyapa->runtime_suspend_sleep_time =
+		cyapa_pwr_cmd_to_sleep_time(cyapa->runtime_suspend_power_mode);
+
+	error = sysfs_merge_group(&dev->kobj, &cyapa_power_runtime_group);
+	if (error) {
+		dev_err(dev,
+			"failed to create power runtime group: %d\n", error);
+		return error;
+	}
+
+	error = devm_add_action(dev, cyapa_remove_power_runtime_group, cyapa);
+	if (error) {
+		cyapa_remove_power_runtime_group(cyapa);
+		dev_err(dev,
+			"failed to add power runtime cleanup action: %d\n",
+			error);
+		return error;
+	}
+
+	/* runtime is enabled until device is operational and opened. */
+	pm_runtime_set_suspended(dev);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_DELAY);
+
+	return 0;
+}
+#else
+static inline int cyapa_start_runtime(struct cyapa *cyapa)
+{
+	return 0;
+}
+#endif /* CONFIG_PM */
+
+static ssize_t cyapa_show_fm_ver(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	int error;
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error)
+		return error;
+	error = scnprintf(buf, PAGE_SIZE, "%d.%d\n", cyapa->fw_maj_ver,
+			 cyapa->fw_min_ver);
+	mutex_unlock(&cyapa->state_sync_lock);
+	return error;
+}
+
+static ssize_t cyapa_show_product_id(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	int size;
+	int error;
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error)
+		return error;
+	size = scnprintf(buf, PAGE_SIZE, "%s\n", cyapa->product_id);
+	mutex_unlock(&cyapa->state_sync_lock);
+	return size;
+}
+
+static int cyapa_firmware(struct cyapa *cyapa, const char *fw_name)
+{
+	struct device *dev = &cyapa->client->dev;
+	const struct firmware *fw;
+	int error;
+
+	error = request_firmware(&fw, fw_name, dev);
+	if (error) {
+		dev_err(dev, "Could not load firmware from %s: %d\n",
+			fw_name, error);
+		return error;
+	}
+
+	error = cyapa->ops->check_fw(cyapa, fw);
+	if (error) {
+		dev_err(dev, "Invalid CYAPA firmware image: %s\n",
+				fw_name);
+		goto done;
+	}
+
+	/*
+	 * Resume the potentially suspended device because doing FW
+	 * update on a device not in the FULL mode has a chance to
+	 * fail.
+	 */
+	pm_runtime_get_sync(dev);
+
+	/* Require IRQ support for firmware update commands. */
+	cyapa_enable_irq_for_cmd(cyapa);
+
+	error = cyapa->ops->bl_enter(cyapa);
+	if (error) {
+		dev_err(dev, "bl_enter failed, %d\n", error);
+		goto err_detect;
+	}
+
+	error = cyapa->ops->bl_activate(cyapa);
+	if (error) {
+		dev_err(dev, "bl_activate failed, %d\n", error);
+		goto err_detect;
+	}
+
+	error = cyapa->ops->bl_initiate(cyapa, fw);
+	if (error) {
+		dev_err(dev, "bl_initiate failed, %d\n", error);
+		goto err_detect;
+	}
+
+	error = cyapa->ops->update_fw(cyapa, fw);
+	if (error) {
+		dev_err(dev, "update_fw failed, %d\n", error);
+		goto err_detect;
+	}
+
+err_detect:
+	cyapa_disable_irq_for_cmd(cyapa);
+	pm_runtime_put_noidle(dev);
+
+done:
+	release_firmware(fw);
+	return error;
+}
+
+static ssize_t cyapa_update_fw_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	char fw_name[NAME_MAX];
+	int ret, error;
+
+	if (count >= NAME_MAX) {
+		dev_err(dev, "File name too long\n");
+		return -EINVAL;
+	}
+
+	memcpy(fw_name, buf, count);
+	if (fw_name[count - 1] == '\n')
+		fw_name[count - 1] = '\0';
+	else
+		fw_name[count] = '\0';
+
+	if (cyapa->input) {
+		/*
+		 * Force the input device to be registered after the firmware
+		 * image is updated, so if the corresponding parameters updated
+		 * in the new firmware image can taken effect immediately.
+		 */
+		input_unregister_device(cyapa->input);
+		cyapa->input = NULL;
+	}
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error) {
+		/*
+		 * Whatever, do reinitialize to try to recover TP state to
+		 * previous state just as it entered fw update entrance.
+		 */
+		cyapa_reinitialize(cyapa);
+		return error;
+	}
+
+	error = cyapa_firmware(cyapa, fw_name);
+	if (error)
+		dev_err(dev, "firmware update failed: %d\n", error);
+	else
+		dev_dbg(dev, "firmware update successfully done.\n");
+
+	/*
+	 * Redetect trackpad device states because firmware update process
+	 * will reset trackpad device into bootloader mode.
+	 */
+	ret = cyapa_reinitialize(cyapa);
+	if (ret) {
+		dev_err(dev, "failed to redetect after updated: %d\n", ret);
+		error = error ? error : ret;
+	}
+
+	mutex_unlock(&cyapa->state_sync_lock);
+
+	return error ? error : count;
+}
+
+static ssize_t cyapa_calibrate_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	int error;
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error)
+		return error;
+
+	if (cyapa->operational) {
+		cyapa_enable_irq_for_cmd(cyapa);
+		error = cyapa->ops->calibrate_store(dev, attr, buf, count);
+		cyapa_disable_irq_for_cmd(cyapa);
+	} else {
+		error = -EBUSY;  /* Still running in bootloader mode. */
+	}
+
+	mutex_unlock(&cyapa->state_sync_lock);
+	return error < 0 ? error : count;
+}
+
+static ssize_t cyapa_show_baseline(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	ssize_t error;
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error)
+		return error;
+
+	if (cyapa->operational) {
+		cyapa_enable_irq_for_cmd(cyapa);
+		error = cyapa->ops->show_baseline(dev, attr, buf);
+		cyapa_disable_irq_for_cmd(cyapa);
+	} else {
+		error = -EBUSY;  /* Still running in bootloader mode. */
+	}
+
+	mutex_unlock(&cyapa->state_sync_lock);
+	return error;
+}
+
+static char *cyapa_state_to_string(struct cyapa *cyapa)
+{
+	switch (cyapa->state) {
+	case CYAPA_STATE_BL_BUSY:
+		return "bootloader busy";
+	case CYAPA_STATE_BL_IDLE:
+		return "bootloader idle";
+	case CYAPA_STATE_BL_ACTIVE:
+		return "bootloader active";
+	case CYAPA_STATE_GEN5_BL:
+		return "bootloader";
+	case CYAPA_STATE_OP:
+	case CYAPA_STATE_GEN5_APP:
+		return "operational";  /* Normal valid state. */
+	default:
+		return "invalid mode";
+	}
+}
+
+static ssize_t cyapa_show_mode(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	int size;
+	int error;
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error)
+		return error;
+
+	size = scnprintf(buf, PAGE_SIZE, "gen%d %s\n",
+			cyapa->gen, cyapa_state_to_string(cyapa));
+
+	mutex_unlock(&cyapa->state_sync_lock);
+	return size;
+}
+
+static DEVICE_ATTR(firmware_version, S_IRUGO, cyapa_show_fm_ver, NULL);
+static DEVICE_ATTR(product_id, S_IRUGO, cyapa_show_product_id, NULL);
+static DEVICE_ATTR(update_fw, S_IWUSR, NULL, cyapa_update_fw_store);
+static DEVICE_ATTR(baseline, S_IRUGO, cyapa_show_baseline, NULL);
+static DEVICE_ATTR(calibrate, S_IWUSR, NULL, cyapa_calibrate_store);
+static DEVICE_ATTR(mode, S_IRUGO, cyapa_show_mode, NULL);
+
+static struct attribute *cyapa_sysfs_entries[] = {
+	&dev_attr_firmware_version.attr,
+	&dev_attr_product_id.attr,
+	&dev_attr_update_fw.attr,
+	&dev_attr_baseline.attr,
+	&dev_attr_calibrate.attr,
+	&dev_attr_mode.attr,
+	NULL,
+};
+
+static const struct attribute_group cyapa_sysfs_group = {
+	.attrs = cyapa_sysfs_entries,
+};
+
+static void cyapa_remove_sysfs_group(void *data)
+{
+	struct cyapa *cyapa = data;
+
+	sysfs_remove_group(&cyapa->client->dev.kobj, &cyapa_sysfs_group);
+}
+
+static int cyapa_probe(struct i2c_client *client,
+		       const struct i2c_device_id *dev_id)
+{
+	struct device *dev = &client->dev;
+	struct cyapa *cyapa;
+	u8 adapter_func;
+	union i2c_smbus_data dummy;
+	int error;
+
+	adapter_func = cyapa_check_adapter_functionality(client);
+	if (adapter_func == CYAPA_ADAPTER_FUNC_NONE) {
+		dev_err(dev, "not a supported I2C/SMBus adapter\n");
+		return -EIO;
+	}
+
+	/* Make sure there is something at this address */
+	if (i2c_smbus_xfer(client->adapter, client->addr, 0,
+			I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0)
+		return -ENODEV;
+
+	cyapa = devm_kzalloc(dev, sizeof(struct cyapa), GFP_KERNEL);
+	if (!cyapa)
+		return -ENOMEM;
+
+	/* i2c isn't supported, use smbus */
+	if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS)
+		cyapa->smbus = true;
+
+	cyapa->client = client;
+	i2c_set_clientdata(client, cyapa);
+	sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr,
+		client->addr);
+
+	error = cyapa_initialize(cyapa);
+	if (error) {
+		dev_err(dev, "failed to detect and initialize tp device.\n");
+		return error;
+	}
+
+	error = sysfs_create_group(&client->dev.kobj, &cyapa_sysfs_group);
+	if (error) {
+		dev_err(dev, "failed to create sysfs entries: %d\n", error);
+		return error;
+	}
+
+	error = devm_add_action(dev, cyapa_remove_sysfs_group, cyapa);
+	if (error) {
+		cyapa_remove_sysfs_group(cyapa);
+		dev_err(dev, "failed to add sysfs cleanup action: %d\n", error);
+		return error;
+	}
+
+	error = cyapa_prepare_wakeup_controls(cyapa);
+	if (error) {
+		dev_err(dev, "failed to prepare wakeup controls: %d\n", error);
+		return error;
+	}
+
+	error = cyapa_start_runtime(cyapa);
+	if (error) {
+		dev_err(dev, "failed to start pm_runtime: %d\n", error);
+		return error;
+	}
+
+	error = devm_request_threaded_irq(dev, client->irq,
+					  NULL, cyapa_irq,
+					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					  "cyapa", cyapa);
+	if (error) {
+		dev_err(dev, "failed to request threaded irq: %d\n", error);
+		return error;
+	}
+
+	/* Disable IRQ until the device is opened */
+	disable_irq(client->irq);
+
+	/*
+	 * Register the device in the input subsystem when it's operational.
+	 * Otherwise, keep in this driver, so it can be be recovered or updated
+	 * through the sysfs mode and update_fw interfaces by user or apps.
+	 */
+	if (cyapa->operational) {
+		error = cyapa_create_input_dev(cyapa);
+		if (error) {
+			dev_err(dev, "create input_dev instance failed: %d\n",
+					error);
+			return error;
+		}
+	}
+
+	return 0;
+}
+
+static int __maybe_unused cyapa_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct cyapa *cyapa = i2c_get_clientdata(client);
+	u8 power_mode;
+	int error;
+
+	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+	if (error)
+		return error;
+
+	/*
+	 * Runtime PM is enable only when device is in operational mode and
+	 * users in use, so need check it before disable it to
+	 * avoid unbalance warning.
+	 */
+	if (pm_runtime_enabled(dev))
+		pm_runtime_disable(dev);
+	disable_irq(client->irq);
+
+	/*
+	 * Set trackpad device to idle mode if wakeup is allowed,
+	 * otherwise turn off.
+	 */
+	if (cyapa->operational) {
+		power_mode = device_may_wakeup(dev) ? cyapa->suspend_power_mode
+						    : PWR_MODE_OFF;
+		error = cyapa->ops->set_power_mode(cyapa, power_mode,
+				cyapa->suspend_sleep_time);
+		if (error)
+			dev_err(dev, "suspend set power mode failed: %d\n",
+					error);
+	}
+
+	if (device_may_wakeup(dev))
+		cyapa->irq_wake = (enable_irq_wake(client->irq) == 0);
+
+	mutex_unlock(&cyapa->state_sync_lock);
+	return 0;
+}
+
+static int __maybe_unused cyapa_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct cyapa *cyapa = i2c_get_clientdata(client);
+	int error;
+
+	mutex_lock(&cyapa->state_sync_lock);
+
+	if (device_may_wakeup(dev) && cyapa->irq_wake) {
+		disable_irq_wake(client->irq);
+		cyapa->irq_wake = false;
+	}
+
+	/* Update device states and runtime PM states. */
+	error = cyapa_reinitialize(cyapa);
+	if (error)
+		dev_warn(dev, "failed to reinitialize TP device: %d\n", error);
+
+	enable_irq(client->irq);
+
+	mutex_unlock(&cyapa->state_sync_lock);
+	return 0;
+}
+
+static int __maybe_unused cyapa_runtime_suspend(struct device *dev)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	int error;
+
+	error = cyapa->ops->set_power_mode(cyapa,
+			cyapa->runtime_suspend_power_mode,
+			cyapa->runtime_suspend_sleep_time);
+	if (error)
+		dev_warn(dev, "runtime suspend failed: %d\n", error);
+
+	return 0;
+}
+
+static int __maybe_unused cyapa_runtime_resume(struct device *dev)
+{
+	struct cyapa *cyapa = dev_get_drvdata(dev);
+	int error;
+
+	error = cyapa->ops->set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE, 0);
+	if (error)
+		dev_warn(dev, "runtime resume failed: %d\n", error);
+
+	return 0;
+}
+
+static const struct dev_pm_ops cyapa_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(cyapa_suspend, cyapa_resume)
+	SET_RUNTIME_PM_OPS(cyapa_runtime_suspend, cyapa_runtime_resume, NULL)
+};
+
+static const struct i2c_device_id cyapa_id_table[] = {
+	{ "cyapa", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, cyapa_id_table);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id cyapa_acpi_id[] = {
+	{ "CYAP0000", 0 },  /* Gen3 trackpad with 0x67 I2C address. */
+	{ "CYAP0001", 0 },  /* Gen5 trackpad with 0x24 I2C address. */
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, cyapa_acpi_id);
+#endif
+
+static struct i2c_driver cyapa_driver = {
+	.driver = {
+		.name = "cyapa",
+		.owner = THIS_MODULE,
+		.pm = &cyapa_pm_ops,
+		.acpi_match_table = ACPI_PTR(cyapa_acpi_id),
+	},
+
+	.probe = cyapa_probe,
+	.id_table = cyapa_id_table,
+};
+
+module_i2c_driver(cyapa_driver);
+
+MODULE_DESCRIPTION("Cypress APA I2C Trackpad Driver");
+MODULE_AUTHOR("Dudley Du <dudl@cypress.com>");
+MODULE_LICENSE("GPL");