cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/mouse/cyapa.c

Directory: drivers/input/mouse
/*
 * 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) 2011-2015 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/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/pm_runtime.h>
#include <linux/acpi.h>
#include <linux/of.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);




bool cyapa_is_pip_bl_mode(struct cyapa *cyapa)
{
	if (cyapa->gen == CYAPA_GEN6 && cyapa->state == CYAPA_STATE_GEN6_BL)
		return true;

	if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_BL)
		return true;

	return false;
}


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bool cyapa_is_pip_app_mode(struct cyapa *cyapa)
{
	if (cyapa->gen == CYAPA_GEN6 && cyapa->state == CYAPA_STATE_GEN6_APP)
		return true;

	if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_APP)
		return true;

	return false;
}


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static bool cyapa_is_bootloader_mode(struct cyapa *cyapa)
{
	if (cyapa_is_pip_bl_mode(cyapa))
		return true;

	if (cyapa->gen == CYAPA_GEN3 &&
		cyapa->state >= CYAPA_STATE_BL_BUSY &&
		cyapa->state <= CYAPA_STATE_BL_ACTIVE)
		return true;

	return false;
}


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static inline bool cyapa_is_operational_mode(struct cyapa *cyapa)
{
	if (cyapa_is_pip_app_mode(cyapa))
		return true;

	if (cyapa->gen == CYAPA_GEN3 && cyapa->state == CYAPA_STATE_OP)
		return true;

	return false;
}


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/* 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;
}


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/**
 * 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;
}


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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;
}


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/*
 * 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_GEN6 ||
				cyapa->gen == CYAPA_GEN5) {
			error = cyapa_pip_state_parse(cyapa,
					status, BL_STATUS_SIZE);
			if (!error)
				goto out_detected;
		}
		/* For old Gen5 trackpads detecting. */
		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;
}


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/*
 * 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;
}


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/*
 * 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_GEN6:
		cyapa->ops = &cyapa_gen6_ops;
		break;
	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;
}



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/*
 * Returns 0 on device detected, negative errno on no device detected.
 * And when the device is detected and operational, 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;
}


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static int cyapa_open(struct input_dev *input)
{
	struct cyapa *cyapa = input_get_drvdata(input);
	struct i2c_client *client = cyapa->client;
	struct device *dev = &client->dev;
	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, CYAPA_PM_ACTIVE);
		if (error) {
			dev_warn(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(dev)) {
		pm_runtime_set_active(dev);
		pm_runtime_enable(dev);
	}

	pm_runtime_get_sync(dev);
	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_sync_autosuspend(dev);
out:
	mutex_unlock(&cyapa->state_sync_lock);
	return error;
}


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static void cyapa_close(struct input_dev *input)
{
	struct cyapa *cyapa = input_get_drvdata(input);
	struct i2c_client *client = cyapa->client;
	struct device *dev = &cyapa->client->dev;

	mutex_lock(&cyapa->state_sync_lock);

	disable_irq(client->irq);
	if (pm_runtime_enabled(dev))
		pm_runtime_disable(dev);
	pm_runtime_set_suspended(dev);

	if (cyapa->operational)
		cyapa->ops->set_power_mode(cyapa,
				PWR_MODE_OFF, 0, CYAPA_PM_DEACTIVE);

	mutex_unlock(&cyapa->state_sync_lock);
}


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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_set_abs_params(input, ABS_DISTANCE, 0, 1, 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;
}


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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, CYAPA_PM_ACTIVE);
		/* Gen3 always using polling mode for command. */
		if (cyapa->gen >= CYAPA_GEN5)
			enable_irq(cyapa->client->irq);
	}
}


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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_PM_ACTIVE);
	}
}


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/*
 * 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;
}


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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;
}


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/* 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)
		error = cyapa_gen6_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, CYAPA_PM_ACTIVE);

	return 0;
}


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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, CYAPA_PM_ACTIVE);

	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, CYAPA_PM_DEACTIVE);
	} 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);

		pm_runtime_get_sync(dev);
		pm_runtime_mark_last_busy(dev);
		pm_runtime_put_sync_autosuspend(dev);
	}

	return error;
}


Contributors
PersonTokensPropCommitsCommitProp
Dudley Du16182.14%583.33%


Benson Leung3517.86%116.67%


Total196100.00%6100.00%






static irqreturn_t cyapa_irq(int irq, void *dev_id)
{
	struct cyapa *cyapa = dev_id;
	struct device *dev = &cyapa->client->dev;
	int error;

	if (device_may_wakeup(dev))
		pm_wakeup_event(dev, 0);

	/* Interrupt event can be caused 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 probing or in firmware image
                         * updating or reading.
                         */
			cyapa->ops->sort_empty_output_data(cyapa,
					NULL, NULL, NULL);
			goto out;
		}

		if (cyapa->operational) {
			error = cyapa->ops->irq_handler(cyapa);

			/*
                         * Apply runtime power management to touch report event
                         * except the events caused by the command responses.
                         * Note:
                         * It will introduce about 20~40 ms additional delay
                         * time in receiving for first valid touch report data.
                         * The time is used to execute device runtime resume
                         * process.
                         */
			pm_runtime_get_sync(dev);
			pm_runtime_mark_last_busy(dev);
			pm_runtime_put_sync_autosuspend(dev);
		}

		if (!cyapa->operational || error) {
			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:
	return IRQ_HANDLED;
}


Contributors
PersonTokensPropCommitsCommitProp
Dudley Du14074.87%480.00%


Benson Leung4725.13%120.00%


Total187100.00%5100.00%



/*
 **************************************************************
 * 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)