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cyapa.c
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/*
* Cypress APA trackpad with I2C interface
*
* Author: Dudley Du <[email protected]>
* Further cleanup and restructuring by:
* Daniel Kurtz <[email protected]>
* Benson Leung <[email protected]>
*
* 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;
}
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;
}
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;
}
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;
}
/* 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 = ®,
},
{
.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_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;
}
/*
* 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_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;
}
/*
* 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;
}
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, false);
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;
}
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, false);
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_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;
}
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, false);
/* 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, false);
}
}
/*
* 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)
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, false);
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, false);
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, false);
} 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;
}
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;
}
/*
**************************************************************
* 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;