linux/drivers/input/keyboard/gpio_keys_polled.c
Linus Torvalds 1ec5c1867a This is the bulk of GPIO changes for the v4.11 cycle
Core changes:
 
 - Augment fwnode_get_named_gpiod() to configure the GPIO pin
   immediately after requesting it like all other APIs do.
   This is a treewide change also updating all users.
 
 - Pass a GPIO label down to gpiod_request() from
   fwnode_get_named_gpiod(). This makes debugfs and the userspace
   ABI correctly reflect the current in-kernel consumer of a pin
   taken using this abstraction. This is a treewide change also
   updating all users.
 
 - Rename devm_get_gpiod_from_child() to
   devm_fwnode_get_gpiod_from_child() to reflect the fact that this
   function is operating on a fwnode object. This is a treewide
   change also updating all users.
 
 - Make it possible to take multiple GPIOs in a single hog of device
   tree hogs.
 
 - The refactorings switching GPIO chips to use the .set_config()
   callback using standard pin control properties and providing
   a backend into the pin control subsystem that were also merged
   into the pin control tree naturally appear here too.
 
 Testing instrumentation:
 
 - A whole slew of cleanups and improvements to the mockup GPIO
   driver. We now have an extended userspace test exercising the
   subsystem, and we can inject interrupts etc from userspace
   to fully test the core GPIO functionality.
 
 New drivers:
 
 - New driver for the Cortina Systems Gemini GPIO controller.
 
 - New driver for the Exar XR17V352/354/358 chips.
 
 - New driver for the ACCES PCI-IDIO-16 PCI GPIO card.
 
 Driver changes:
 
 - RCAR: set the irqchip parent device, add fine-grained runtime
   PM support.
 
 - pca953x: support optional RESET control line on the chip.
 
 - DaVinci: cleanups and simplifications. Add support for multiple
   instances.
 
 - .set_multiple() and naming of lines on more or less all of the
   ISA/PCI GPIO controllers.
 
 - mcp23s08: refactored to use regmap as a first step to further
   rewrites and modernizations.
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Merge tag 'gpio-v4.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "This is the bulk of GPIO changes for the v4.11 cycle

  Core changes:

   - Augment fwnode_get_named_gpiod() to configure the GPIO pin
     immediately after requesting it like all other APIs do. This is a
     treewide change also updating all users.

   - Pass a GPIO label down to gpiod_request() from
     fwnode_get_named_gpiod(). This makes debugfs and the userspace ABI
     correctly reflect the current in-kernel consumer of a pin taken
     using this abstraction. This is a treewide change also updating all
     users.

   - Rename devm_get_gpiod_from_child() to
     devm_fwnode_get_gpiod_from_child() to reflect the fact that this
     function is operating on a fwnode object. This is a treewide change
     also updating all users.

   - Make it possible to take multiple GPIOs in a single hog of device
     tree hogs.

   - The refactorings switching GPIO chips to use the .set_config()
     callback using standard pin control properties and providing a
     backend into the pin control subsystem that were also merged into
     the pin control tree naturally appear here too.

  Testing instrumentation:

   - A whole slew of cleanups and improvements to the mockup GPIO
     driver. We now have an extended userspace test exercising the
     subsystem, and we can inject interrupts etc from userspace to fully
     test the core GPIO functionality.

  New drivers:

   - New driver for the Cortina Systems Gemini GPIO controller.

   - New driver for the Exar XR17V352/354/358 chips.

   - New driver for the ACCES PCI-IDIO-16 PCI GPIO card.

  Driver changes:

   - RCAR: set the irqchip parent device, add fine-grained runtime PM
     support.

   - pca953x: support optional RESET control line on the chip.

   - DaVinci: cleanups and simplifications. Add support for multiple
     instances.

   - .set_multiple() and naming of lines on more or less all of the
     ISA/PCI GPIO controllers.

   - mcp23s08: refactored to use regmap as a first step to further
     rewrites and modernizations"

* tag 'gpio-v4.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (61 commits)
  gpio: reintroduce devm_get_gpiod_from_child()
  gpio: pci-idio-16: Fix PCI BAR index
  gpio: pci-idio-16: Fix PCI device ID code
  gpio: mockup: implement event injecting over debugfs
  gpio: mockup: add a dummy irqchip
  gpio: mockup: implement naming the lines
  gpio: mockup: code shrink
  gpio: mockup: readability tweaks
  gpio: Add GPIO support for the ACCES PCI-IDIO-16
  gpio: Add the devm_fwnode_get_index_gpiod_from_child() helper
  gpio: Rename devm_get_gpiod_from_child()
  gpio: mcp23s08: Select REGMAP/REGMAP_I2C to fix build error
  gpio: ws16c48: Add support for GPIO names
  gpio: gpio-mm: Add support for GPIO names
  gpio: 104-idio-16: Add support for GPIO names
  gpio: 104-idi-48: Add support for GPIO names
  gpio: 104-dio-48e: Add support for GPIO names
  gpio: ws16c48: Remove unnecessary driver_data set
  gpio: gpio-mm: Remove unnecessary driver_data set
  gpio: 104-idio-16: Remove unnecessary driver_data set
  ...
2017-02-23 08:46:04 -08:00

393 lines
9.9 KiB
C

/*
* Driver for buttons on GPIO lines not capable of generating interrupts
*
* Copyright (C) 2007-2010 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2010 Nuno Goncalves <nunojpg@gmail.com>
*
* This file was based on: /drivers/input/misc/cobalt_btns.c
* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
*
* also was based on: /drivers/input/keyboard/gpio_keys.c
* Copyright 2005 Phil Blundell
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input-polldev.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio_keys.h>
#include <linux/property.h>
#define DRV_NAME "gpio-keys-polled"
struct gpio_keys_button_data {
struct gpio_desc *gpiod;
int last_state;
int count;
int threshold;
};
struct gpio_keys_polled_dev {
struct input_polled_dev *poll_dev;
struct device *dev;
const struct gpio_keys_platform_data *pdata;
unsigned long rel_axis_seen[BITS_TO_LONGS(REL_CNT)];
unsigned long abs_axis_seen[BITS_TO_LONGS(ABS_CNT)];
struct gpio_keys_button_data data[0];
};
static void gpio_keys_button_event(struct input_polled_dev *dev,
const struct gpio_keys_button *button,
int state)
{
struct gpio_keys_polled_dev *bdev = dev->private;
struct input_dev *input = dev->input;
unsigned int type = button->type ?: EV_KEY;
if (type == EV_REL) {
if (state) {
input_event(input, type, button->code, button->value);
__set_bit(button->code, bdev->rel_axis_seen);
}
} else if (type == EV_ABS) {
if (state) {
input_event(input, type, button->code, button->value);
__set_bit(button->code, bdev->abs_axis_seen);
}
} else {
input_event(input, type, button->code, state);
input_sync(input);
}
}
static void gpio_keys_polled_check_state(struct input_polled_dev *dev,
const struct gpio_keys_button *button,
struct gpio_keys_button_data *bdata)
{
int state;
state = gpiod_get_value_cansleep(bdata->gpiod);
if (state < 0) {
dev_err(dev->input->dev.parent,
"failed to get gpio state: %d\n", state);
} else {
gpio_keys_button_event(dev, button, state);
if (state != bdata->last_state) {
bdata->count = 0;
bdata->last_state = state;
}
}
}
static void gpio_keys_polled_poll(struct input_polled_dev *dev)
{
struct gpio_keys_polled_dev *bdev = dev->private;
const struct gpio_keys_platform_data *pdata = bdev->pdata;
struct input_dev *input = dev->input;
int i;
memset(bdev->rel_axis_seen, 0, sizeof(bdev->rel_axis_seen));
memset(bdev->abs_axis_seen, 0, sizeof(bdev->abs_axis_seen));
for (i = 0; i < pdata->nbuttons; i++) {
struct gpio_keys_button_data *bdata = &bdev->data[i];
if (bdata->count < bdata->threshold) {
bdata->count++;
gpio_keys_button_event(dev, &pdata->buttons[i],
bdata->last_state);
} else {
gpio_keys_polled_check_state(dev, &pdata->buttons[i],
bdata);
}
}
for_each_set_bit(i, input->relbit, REL_CNT) {
if (!test_bit(i, bdev->rel_axis_seen))
input_event(input, EV_REL, i, 0);
}
for_each_set_bit(i, input->absbit, ABS_CNT) {
if (!test_bit(i, bdev->abs_axis_seen))
input_event(input, EV_ABS, i, 0);
}
input_sync(input);
}
static void gpio_keys_polled_open(struct input_polled_dev *dev)
{
struct gpio_keys_polled_dev *bdev = dev->private;
const struct gpio_keys_platform_data *pdata = bdev->pdata;
if (pdata->enable)
pdata->enable(bdev->dev);
}
static void gpio_keys_polled_close(struct input_polled_dev *dev)
{
struct gpio_keys_polled_dev *bdev = dev->private;
const struct gpio_keys_platform_data *pdata = bdev->pdata;
if (pdata->disable)
pdata->disable(bdev->dev);
}
static struct gpio_keys_platform_data *
gpio_keys_polled_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(-EINVAL);
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_present(dev, "autorepeat");
device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);
device_for_each_child_node(dev, child) {
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;
if (fwnode_property_read_u32(child, "linux,input-value",
(u32 *)&button->value))
button->value = 1;
button->wakeup =
fwnode_property_read_bool(child, "wakeup-source") ||
/* legacy name */
fwnode_property_read_bool(child, "gpio-key,wakeup");
if (fwnode_property_read_u32(child, "debounce-interval",
&button->debounce_interval))
button->debounce_interval = 5;
button++;
}
return pdata;
}
static void gpio_keys_polled_set_abs_params(struct input_dev *input,
const struct gpio_keys_platform_data *pdata, unsigned int code)
{
int i, min = 0, max = 0;
for (i = 0; i < pdata->nbuttons; i++) {
const struct gpio_keys_button *button = &pdata->buttons[i];
if (button->type != EV_ABS || button->code != code)
continue;
if (button->value < min)
min = button->value;
if (button->value > max)
max = button->value;
}
input_set_abs_params(input, code, min, max, 0, 0);
}
static const struct of_device_id gpio_keys_polled_of_match[] = {
{ .compatible = "gpio-keys-polled", },
{ },
};
MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
static int gpio_keys_polled_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct fwnode_handle *child = NULL;
const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
struct gpio_keys_polled_dev *bdev;
struct input_polled_dev *poll_dev;
struct input_dev *input;
size_t size;
int error;
int i;
if (!pdata) {
pdata = gpio_keys_polled_get_devtree_pdata(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
}
if (!pdata->poll_interval) {
dev_err(dev, "missing poll_interval value\n");
return -EINVAL;
}
size = sizeof(struct gpio_keys_polled_dev) +
pdata->nbuttons * sizeof(struct gpio_keys_button_data);
bdev = devm_kzalloc(dev, size, GFP_KERNEL);
if (!bdev) {
dev_err(dev, "no memory for private data\n");
return -ENOMEM;
}
poll_dev = devm_input_allocate_polled_device(dev);
if (!poll_dev) {
dev_err(dev, "no memory for polled device\n");
return -ENOMEM;
}
poll_dev->private = bdev;
poll_dev->poll = gpio_keys_polled_poll;
poll_dev->poll_interval = pdata->poll_interval;
poll_dev->open = gpio_keys_polled_open;
poll_dev->close = gpio_keys_polled_close;
input = poll_dev->input;
input->name = pdev->name;
input->phys = DRV_NAME"/input0";
input->id.bustype = BUS_HOST;
input->id.vendor = 0x0001;
input->id.product = 0x0001;
input->id.version = 0x0100;
__set_bit(EV_KEY, input->evbit);
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];
struct gpio_keys_button_data *bdata = &bdev->data[i];
unsigned int type = button->type ?: EV_KEY;
if (button->wakeup) {
dev_err(dev, DRV_NAME " does not support wakeup\n");
fwnode_handle_put(child);
return -EINVAL;
}
if (!dev_get_platdata(dev)) {
/* No legacy static platform data */
child = device_get_next_child_node(dev, child);
if (!child) {
dev_err(dev, "missing child device node\n");
return -EINVAL;
}
bdata->gpiod = devm_fwnode_get_gpiod_from_child(dev,
NULL, child,
GPIOD_IN,
button->desc);
if (IS_ERR(bdata->gpiod)) {
error = PTR_ERR(bdata->gpiod);
if (error != -EPROBE_DEFER)
dev_err(dev,
"failed to get gpio: %d\n",
error);
fwnode_handle_put(child);
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, button->desc ? : DRV_NAME);
if (error) {
dev_err(dev,
"unable to claim gpio %u, err=%d\n",
button->gpio, error);
return error;
}
bdata->gpiod = gpio_to_desc(button->gpio);
if (!bdata->gpiod) {
dev_err(dev,
"unable to convert gpio %u to descriptor\n",
button->gpio);
return -EINVAL;
}
}
bdata->last_state = -1;
bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
pdata->poll_interval);
input_set_capability(input, type, button->code);
if (type == EV_ABS)
gpio_keys_polled_set_abs_params(input, pdata,
button->code);
}
fwnode_handle_put(child);
bdev->poll_dev = poll_dev;
bdev->dev = dev;
bdev->pdata = pdata;
error = input_register_polled_device(poll_dev);
if (error) {
dev_err(dev, "unable to register polled device, err=%d\n",
error);
return error;
}
/* report initial state of the buttons */
for (i = 0; i < pdata->nbuttons; i++)
gpio_keys_polled_check_state(poll_dev, &pdata->buttons[i],
&bdev->data[i]);
input_sync(input);
return 0;
}
static struct platform_driver gpio_keys_polled_driver = {
.probe = gpio_keys_polled_probe,
.driver = {
.name = DRV_NAME,
.of_match_table = gpio_keys_polled_of_match,
},
};
module_platform_driver(gpio_keys_polled_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_DESCRIPTION("Polled GPIO Buttons driver");
MODULE_ALIAS("platform:" DRV_NAME);