linux_dsm_epyc7002/drivers/input/keyboard/gpio_keys.c
Joseph Lo 0f107573da Input: gpio_keys - handle the missing key press event in resume phase
The GPIO key press event might be missed in the resume phase, if the key
had been released before the system had been resumed to the stage that it
could capture the press event. So we simulate the wakeup key press event
in case the key had been released by the time we got interrupt handler
to run.

Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2017-07-09 14:43:27 -07:00

940 lines
23 KiB
C

/*
* Driver for keys on GPIO lines capable of generating interrupts.
*
* Copyright 2005 Phil Blundell
* Copyright 2010, 2011 David Jander <david@protonic.nl>
*
* 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/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/gpio_keys.h>
#include <linux/workqueue.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/spinlock.h>
struct gpio_button_data {
const struct gpio_keys_button *button;
struct input_dev *input;
struct gpio_desc *gpiod;
unsigned short *code;
struct timer_list release_timer;
unsigned int release_delay; /* in msecs, for IRQ-only buttons */
struct delayed_work work;
unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */
unsigned int irq;
spinlock_t lock;
bool disabled;
bool key_pressed;
bool suspended;
};
struct gpio_keys_drvdata {
const struct gpio_keys_platform_data *pdata;
struct input_dev *input;
struct mutex disable_lock;
unsigned short *keymap;
struct gpio_button_data data[0];
};
/*
* SYSFS interface for enabling/disabling keys and switches:
*
* There are 4 attributes under /sys/devices/platform/gpio-keys/
* keys [ro] - bitmap of keys (EV_KEY) which can be
* disabled
* switches [ro] - bitmap of switches (EV_SW) which can be
* disabled
* disabled_keys [rw] - bitmap of keys currently disabled
* disabled_switches [rw] - bitmap of switches currently disabled
*
* Userland can change these values and hence disable event generation
* for each key (or switch). Disabling a key means its interrupt line
* is disabled.
*
* For example, if we have following switches set up as gpio-keys:
* SW_DOCK = 5
* SW_CAMERA_LENS_COVER = 9
* SW_KEYPAD_SLIDE = 10
* SW_FRONT_PROXIMITY = 11
* This is read from switches:
* 11-9,5
* Next we want to disable proximity (11) and dock (5), we write:
* 11,5
* to file disabled_switches. Now proximity and dock IRQs are disabled.
* This can be verified by reading the file disabled_switches:
* 11,5
* If we now want to enable proximity (11) switch we write:
* 5
* to disabled_switches.
*
* We can disable only those keys which don't allow sharing the irq.
*/
/**
* get_n_events_by_type() - returns maximum number of events per @type
* @type: type of button (%EV_KEY, %EV_SW)
*
* Return value of this function can be used to allocate bitmap
* large enough to hold all bits for given type.
*/
static int get_n_events_by_type(int type)
{
BUG_ON(type != EV_SW && type != EV_KEY);
return (type == EV_KEY) ? KEY_CNT : SW_CNT;
}
/**
* get_bm_events_by_type() - returns bitmap of supported events per @type
* @input: input device from which bitmap is retrieved
* @type: type of button (%EV_KEY, %EV_SW)
*
* Return value of this function can be used to allocate bitmap
* large enough to hold all bits for given type.
*/
static const unsigned long *get_bm_events_by_type(struct input_dev *dev,
int type)
{
BUG_ON(type != EV_SW && type != EV_KEY);
return (type == EV_KEY) ? dev->keybit : dev->swbit;
}
/**
* gpio_keys_disable_button() - disables given GPIO button
* @bdata: button data for button to be disabled
*
* Disables button pointed by @bdata. This is done by masking
* IRQ line. After this function is called, button won't generate
* input events anymore. Note that one can only disable buttons
* that don't share IRQs.
*
* Make sure that @bdata->disable_lock is locked when entering
* this function to avoid races when concurrent threads are
* disabling buttons at the same time.
*/
static void gpio_keys_disable_button(struct gpio_button_data *bdata)
{
if (!bdata->disabled) {
/*
* Disable IRQ and associated timer/work structure.
*/
disable_irq(bdata->irq);
if (bdata->gpiod)
cancel_delayed_work_sync(&bdata->work);
else
del_timer_sync(&bdata->release_timer);
bdata->disabled = true;
}
}
/**
* gpio_keys_enable_button() - enables given GPIO button
* @bdata: button data for button to be disabled
*
* Enables given button pointed by @bdata.
*
* Make sure that @bdata->disable_lock is locked when entering
* this function to avoid races with concurrent threads trying
* to enable the same button at the same time.
*/
static void gpio_keys_enable_button(struct gpio_button_data *bdata)
{
if (bdata->disabled) {
enable_irq(bdata->irq);
bdata->disabled = false;
}
}
/**
* gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons
* @ddata: pointer to drvdata
* @buf: buffer where stringified bitmap is written
* @type: button type (%EV_KEY, %EV_SW)
* @only_disabled: does caller want only those buttons that are
* currently disabled or all buttons that can be
* disabled
*
* This function writes buttons that can be disabled to @buf. If
* @only_disabled is true, then @buf contains only those buttons
* that are currently disabled. Returns 0 on success or negative
* errno on failure.
*/
static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata,
char *buf, unsigned int type,
bool only_disabled)
{
int n_events = get_n_events_by_type(type);
unsigned long *bits;
ssize_t ret;
int i;
bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL);
if (!bits)
return -ENOMEM;
for (i = 0; i < ddata->pdata->nbuttons; i++) {
struct gpio_button_data *bdata = &ddata->data[i];
if (bdata->button->type != type)
continue;
if (only_disabled && !bdata->disabled)
continue;
__set_bit(*bdata->code, bits);
}
ret = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", n_events, bits);
buf[ret++] = '\n';
buf[ret] = '\0';
kfree(bits);
return ret;
}
/**
* gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap
* @ddata: pointer to drvdata
* @buf: buffer from userspace that contains stringified bitmap
* @type: button type (%EV_KEY, %EV_SW)
*
* This function parses stringified bitmap from @buf and disables/enables
* GPIO buttons accordingly. Returns 0 on success and negative error
* on failure.
*/
static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata,
const char *buf, unsigned int type)
{
int n_events = get_n_events_by_type(type);
const unsigned long *bitmap = get_bm_events_by_type(ddata->input, type);
unsigned long *bits;
ssize_t error;
int i;
bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL);
if (!bits)
return -ENOMEM;
error = bitmap_parselist(buf, bits, n_events);
if (error)
goto out;
/* First validate */
if (!bitmap_subset(bits, bitmap, n_events)) {
error = -EINVAL;
goto out;
}
for (i = 0; i < ddata->pdata->nbuttons; i++) {
struct gpio_button_data *bdata = &ddata->data[i];
if (bdata->button->type != type)
continue;
if (test_bit(*bdata->code, bits) &&
!bdata->button->can_disable) {
error = -EINVAL;
goto out;
}
}
mutex_lock(&ddata->disable_lock);
for (i = 0; i < ddata->pdata->nbuttons; i++) {
struct gpio_button_data *bdata = &ddata->data[i];
if (bdata->button->type != type)
continue;
if (test_bit(*bdata->code, bits))
gpio_keys_disable_button(bdata);
else
gpio_keys_enable_button(bdata);
}
mutex_unlock(&ddata->disable_lock);
out:
kfree(bits);
return error;
}
#define ATTR_SHOW_FN(name, type, only_disabled) \
static ssize_t gpio_keys_show_##name(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct platform_device *pdev = to_platform_device(dev); \
struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
\
return gpio_keys_attr_show_helper(ddata, buf, \
type, only_disabled); \
}
ATTR_SHOW_FN(keys, EV_KEY, false);
ATTR_SHOW_FN(switches, EV_SW, false);
ATTR_SHOW_FN(disabled_keys, EV_KEY, true);
ATTR_SHOW_FN(disabled_switches, EV_SW, true);
/*
* ATTRIBUTES:
*
* /sys/devices/platform/gpio-keys/keys [ro]
* /sys/devices/platform/gpio-keys/switches [ro]
*/
static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL);
static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL);
#define ATTR_STORE_FN(name, type) \
static ssize_t gpio_keys_store_##name(struct device *dev, \
struct device_attribute *attr, \
const char *buf, \
size_t count) \
{ \
struct platform_device *pdev = to_platform_device(dev); \
struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
ssize_t error; \
\
error = gpio_keys_attr_store_helper(ddata, buf, type); \
if (error) \
return error; \
\
return count; \
}
ATTR_STORE_FN(disabled_keys, EV_KEY);
ATTR_STORE_FN(disabled_switches, EV_SW);
/*
* ATTRIBUTES:
*
* /sys/devices/platform/gpio-keys/disabled_keys [rw]
* /sys/devices/platform/gpio-keys/disables_switches [rw]
*/
static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO,
gpio_keys_show_disabled_keys,
gpio_keys_store_disabled_keys);
static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO,
gpio_keys_show_disabled_switches,
gpio_keys_store_disabled_switches);
static struct attribute *gpio_keys_attrs[] = {
&dev_attr_keys.attr,
&dev_attr_switches.attr,
&dev_attr_disabled_keys.attr,
&dev_attr_disabled_switches.attr,
NULL,
};
static struct attribute_group gpio_keys_attr_group = {
.attrs = gpio_keys_attrs,
};
static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
{
const struct gpio_keys_button *button = bdata->button;
struct input_dev *input = bdata->input;
unsigned int type = button->type ?: EV_KEY;
int state;
state = gpiod_get_value_cansleep(bdata->gpiod);
if (state < 0) {
dev_err(input->dev.parent,
"failed to get gpio state: %d\n", state);
return;
}
if (type == EV_ABS) {
if (state)
input_event(input, type, button->code, button->value);
} else {
input_event(input, type, *bdata->code, state);
}
input_sync(input);
}
static void gpio_keys_gpio_work_func(struct work_struct *work)
{
struct gpio_button_data *bdata =
container_of(work, struct gpio_button_data, work.work);
gpio_keys_gpio_report_event(bdata);
if (bdata->button->wakeup)
pm_relax(bdata->input->dev.parent);
}
static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)
{
struct gpio_button_data *bdata = dev_id;
BUG_ON(irq != bdata->irq);
if (bdata->button->wakeup) {
const struct gpio_keys_button *button = bdata->button;
pm_stay_awake(bdata->input->dev.parent);
if (bdata->suspended &&
(button->type == 0 || button->type == EV_KEY)) {
/*
* Simulate wakeup key press in case the key has
* already released by the time we got interrupt
* handler to run.
*/
input_report_key(bdata->input, button->code, 1);
}
}
mod_delayed_work(system_wq,
&bdata->work,
msecs_to_jiffies(bdata->software_debounce));
return IRQ_HANDLED;
}
static void gpio_keys_irq_timer(unsigned long _data)
{
struct gpio_button_data *bdata = (struct gpio_button_data *)_data;
struct input_dev *input = bdata->input;
unsigned long flags;
spin_lock_irqsave(&bdata->lock, flags);
if (bdata->key_pressed) {
input_event(input, EV_KEY, *bdata->code, 0);
input_sync(input);
bdata->key_pressed = false;
}
spin_unlock_irqrestore(&bdata->lock, flags);
}
static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
{
struct gpio_button_data *bdata = dev_id;
struct input_dev *input = bdata->input;
unsigned long flags;
BUG_ON(irq != bdata->irq);
spin_lock_irqsave(&bdata->lock, flags);
if (!bdata->key_pressed) {
if (bdata->button->wakeup)
pm_wakeup_event(bdata->input->dev.parent, 0);
input_event(input, EV_KEY, *bdata->code, 1);
input_sync(input);
if (!bdata->release_delay) {
input_event(input, EV_KEY, *bdata->code, 0);
input_sync(input);
goto out;
}
bdata->key_pressed = true;
}
if (bdata->release_delay)
mod_timer(&bdata->release_timer,
jiffies + msecs_to_jiffies(bdata->release_delay));
out:
spin_unlock_irqrestore(&bdata->lock, flags);
return IRQ_HANDLED;
}
static void gpio_keys_quiesce_key(void *data)
{
struct gpio_button_data *bdata = data;
if (bdata->gpiod)
cancel_delayed_work_sync(&bdata->work);
else
del_timer_sync(&bdata->release_timer);
}
static int gpio_keys_setup_key(struct platform_device *pdev,
struct input_dev *input,
struct gpio_keys_drvdata *ddata,
const struct gpio_keys_button *button,
int idx,
struct fwnode_handle *child)
{
const char *desc = button->desc ? button->desc : "gpio_keys";
struct device *dev = &pdev->dev;
struct gpio_button_data *bdata = &ddata->data[idx];
irq_handler_t isr;
unsigned long irqflags;
int irq;
int error;
bdata->input = input;
bdata->button = button;
spin_lock_init(&bdata->lock);
if (child) {
bdata->gpiod = devm_fwnode_get_gpiod_from_child(dev, NULL,
child,
GPIOD_IN,
desc);
if (IS_ERR(bdata->gpiod)) {
error = PTR_ERR(bdata->gpiod);
if (error == -ENOENT) {
/*
* GPIO is optional, we may be dealing with
* purely interrupt-driven setup.
*/
bdata->gpiod = NULL;
} else {
if (error != -EPROBE_DEFER)
dev_err(dev, "failed to get gpio: %d\n",
error);
return error;
}
}
} else if (gpio_is_valid(button->gpio)) {
/*
* Legacy GPIO number, so request the GPIO here and
* convert it to descriptor.
*/
unsigned flags = GPIOF_IN;
if (button->active_low)
flags |= GPIOF_ACTIVE_LOW;
error = devm_gpio_request_one(dev, button->gpio, flags, desc);
if (error < 0) {
dev_err(dev, "Failed to request GPIO %d, error %d\n",
button->gpio, error);
return error;
}
bdata->gpiod = gpio_to_desc(button->gpio);
if (!bdata->gpiod)
return -EINVAL;
}
if (bdata->gpiod) {
if (button->debounce_interval) {
error = gpiod_set_debounce(bdata->gpiod,
button->debounce_interval * 1000);
/* use timer if gpiolib doesn't provide debounce */
if (error < 0)
bdata->software_debounce =
button->debounce_interval;
}
if (button->irq) {
bdata->irq = button->irq;
} else {
irq = gpiod_to_irq(bdata->gpiod);
if (irq < 0) {
error = irq;
dev_err(dev,
"Unable to get irq number for GPIO %d, error %d\n",
button->gpio, error);
return error;
}
bdata->irq = irq;
}
INIT_DELAYED_WORK(&bdata->work, gpio_keys_gpio_work_func);
isr = gpio_keys_gpio_isr;
irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
} else {
if (!button->irq) {
dev_err(dev, "Found button without gpio or irq\n");
return -EINVAL;
}
bdata->irq = button->irq;
if (button->type && button->type != EV_KEY) {
dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n");
return -EINVAL;
}
bdata->release_delay = button->debounce_interval;
setup_timer(&bdata->release_timer,
gpio_keys_irq_timer, (unsigned long)bdata);
isr = gpio_keys_irq_isr;
irqflags = 0;
}
bdata->code = &ddata->keymap[idx];
*bdata->code = button->code;
input_set_capability(input, button->type ?: EV_KEY, *bdata->code);
/*
* Install custom action to cancel release timer and
* workqueue item.
*/
error = devm_add_action(dev, gpio_keys_quiesce_key, bdata);
if (error) {
dev_err(dev, "failed to register quiesce action, error: %d\n",
error);
return error;
}
/*
* If platform has specified that the button can be disabled,
* we don't want it to share the interrupt line.
*/
if (!button->can_disable)
irqflags |= IRQF_SHARED;
error = devm_request_any_context_irq(dev, bdata->irq, isr, irqflags,
desc, bdata);
if (error < 0) {
dev_err(dev, "Unable to claim irq %d; error %d\n",
bdata->irq, error);
return error;
}
return 0;
}
static void gpio_keys_report_state(struct gpio_keys_drvdata *ddata)
{
struct input_dev *input = ddata->input;
int i;
for (i = 0; i < ddata->pdata->nbuttons; i++) {
struct gpio_button_data *bdata = &ddata->data[i];
if (bdata->gpiod)
gpio_keys_gpio_report_event(bdata);
}
input_sync(input);
}
static int gpio_keys_open(struct input_dev *input)
{
struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
const struct gpio_keys_platform_data *pdata = ddata->pdata;
int error;
if (pdata->enable) {
error = pdata->enable(input->dev.parent);
if (error)
return error;
}
/* Report current state of buttons that are connected to GPIOs */
gpio_keys_report_state(ddata);
return 0;
}
static void gpio_keys_close(struct input_dev *input)
{
struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
const struct gpio_keys_platform_data *pdata = ddata->pdata;
if (pdata->disable)
pdata->disable(input->dev.parent);
}
/*
* Handlers for alternative sources of platform_data
*/
/*
* Translate properties into platform_data
*/
static struct gpio_keys_platform_data *
gpio_keys_get_devtree_pdata(struct device *dev)
{
struct gpio_keys_platform_data *pdata;
struct gpio_keys_button *button;
struct fwnode_handle *child;
int nbuttons;
nbuttons = device_get_child_node_count(dev);
if (nbuttons == 0)
return ERR_PTR(-ENODEV);
pdata = devm_kzalloc(dev,
sizeof(*pdata) + nbuttons * sizeof(*button),
GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
button = (struct gpio_keys_button *)(pdata + 1);
pdata->buttons = button;
pdata->nbuttons = nbuttons;
pdata->rep = device_property_read_bool(dev, "autorepeat");
device_property_read_string(dev, "label", &pdata->name);
device_for_each_child_node(dev, child) {
if (is_of_node(child))
button->irq =
irq_of_parse_and_map(to_of_node(child), 0);
if (fwnode_property_read_u32(child, "linux,code",
&button->code)) {
dev_err(dev, "Button without keycode\n");
fwnode_handle_put(child);
return ERR_PTR(-EINVAL);
}
fwnode_property_read_string(child, "label", &button->desc);
if (fwnode_property_read_u32(child, "linux,input-type",
&button->type))
button->type = EV_KEY;
button->wakeup =
fwnode_property_read_bool(child, "wakeup-source") ||
/* legacy name */
fwnode_property_read_bool(child, "gpio-key,wakeup");
button->can_disable =
fwnode_property_read_bool(child, "linux,can-disable");
if (fwnode_property_read_u32(child, "debounce-interval",
&button->debounce_interval))
button->debounce_interval = 5;
button++;
}
return pdata;
}
static const struct of_device_id gpio_keys_of_match[] = {
{ .compatible = "gpio-keys", },
{ },
};
MODULE_DEVICE_TABLE(of, gpio_keys_of_match);
static int gpio_keys_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
struct fwnode_handle *child = NULL;
struct gpio_keys_drvdata *ddata;
struct input_dev *input;
size_t size;
int i, error;
int wakeup = 0;
if (!pdata) {
pdata = gpio_keys_get_devtree_pdata(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
}
size = sizeof(struct gpio_keys_drvdata) +
pdata->nbuttons * sizeof(struct gpio_button_data);
ddata = devm_kzalloc(dev, size, GFP_KERNEL);
if (!ddata) {
dev_err(dev, "failed to allocate state\n");
return -ENOMEM;
}
ddata->keymap = devm_kcalloc(dev,
pdata->nbuttons, sizeof(ddata->keymap[0]),
GFP_KERNEL);
if (!ddata->keymap)
return -ENOMEM;
input = devm_input_allocate_device(dev);
if (!input) {
dev_err(dev, "failed to allocate input device\n");
return -ENOMEM;
}
ddata->pdata = pdata;
ddata->input = input;
mutex_init(&ddata->disable_lock);
platform_set_drvdata(pdev, ddata);
input_set_drvdata(input, ddata);
input->name = pdata->name ? : pdev->name;
input->phys = "gpio-keys/input0";
input->dev.parent = dev;
input->open = gpio_keys_open;
input->close = gpio_keys_close;
input->id.bustype = BUS_HOST;
input->id.vendor = 0x0001;
input->id.product = 0x0001;
input->id.version = 0x0100;
input->keycode = ddata->keymap;
input->keycodesize = sizeof(ddata->keymap[0]);
input->keycodemax = pdata->nbuttons;
/* Enable auto repeat feature of Linux input subsystem */
if (pdata->rep)
__set_bit(EV_REP, input->evbit);
for (i = 0; i < pdata->nbuttons; i++) {
const struct gpio_keys_button *button = &pdata->buttons[i];
if (!dev_get_platdata(dev)) {
child = device_get_next_child_node(dev, child);
if (!child) {
dev_err(dev,
"missing child device node for entry %d\n",
i);
return -EINVAL;
}
}
error = gpio_keys_setup_key(pdev, input, ddata,
button, i, child);
if (error) {
fwnode_handle_put(child);
return error;
}
if (button->wakeup)
wakeup = 1;
}
fwnode_handle_put(child);
error = sysfs_create_group(&dev->kobj, &gpio_keys_attr_group);
if (error) {
dev_err(dev, "Unable to export keys/switches, error: %d\n",
error);
return error;
}
error = input_register_device(input);
if (error) {
dev_err(dev, "Unable to register input device, error: %d\n",
error);
goto err_remove_group;
}
device_init_wakeup(dev, wakeup);
return 0;
err_remove_group:
sysfs_remove_group(&dev->kobj, &gpio_keys_attr_group);
return error;
}
static int gpio_keys_remove(struct platform_device *pdev)
{
sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
return 0;
}
static int __maybe_unused gpio_keys_suspend(struct device *dev)
{
struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
struct input_dev *input = ddata->input;
int i;
if (device_may_wakeup(dev)) {
for (i = 0; i < ddata->pdata->nbuttons; i++) {
struct gpio_button_data *bdata = &ddata->data[i];
if (bdata->button->wakeup)
enable_irq_wake(bdata->irq);
bdata->suspended = true;
}
} else {
mutex_lock(&input->mutex);
if (input->users)
gpio_keys_close(input);
mutex_unlock(&input->mutex);
}
return 0;
}
static int __maybe_unused gpio_keys_resume(struct device *dev)
{
struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
struct input_dev *input = ddata->input;
int error = 0;
int i;
if (device_may_wakeup(dev)) {
for (i = 0; i < ddata->pdata->nbuttons; i++) {
struct gpio_button_data *bdata = &ddata->data[i];
if (bdata->button->wakeup)
disable_irq_wake(bdata->irq);
bdata->suspended = false;
}
} else {
mutex_lock(&input->mutex);
if (input->users)
error = gpio_keys_open(input);
mutex_unlock(&input->mutex);
}
if (error)
return error;
gpio_keys_report_state(ddata);
return 0;
}
static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume);
static struct platform_driver gpio_keys_device_driver = {
.probe = gpio_keys_probe,
.remove = gpio_keys_remove,
.driver = {
.name = "gpio-keys",
.pm = &gpio_keys_pm_ops,
.of_match_table = gpio_keys_of_match,
}
};
static int __init gpio_keys_init(void)
{
return platform_driver_register(&gpio_keys_device_driver);
}
static void __exit gpio_keys_exit(void)
{
platform_driver_unregister(&gpio_keys_device_driver);
}
late_initcall(gpio_keys_init);
module_exit(gpio_keys_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
MODULE_DESCRIPTION("Keyboard driver for GPIOs");
MODULE_ALIAS("platform:gpio-keys");