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3717194f24
Some SoCs have a separate dedicated wake-up interrupt controller that can be used to wake up the system from deeper idle states. We already support configuring a separate interrupt for a gpio-keys button to be used with a gpio line. However, we are lacking support system suspend for cases where a separate interrupt needs to be used in deeper sleep modes. Because of it's nature, gpio-keys does not know about the runtime PM state of the button gpios, and may have several gpio buttons configured for each gpio-keys device instance. Implementing runtime PM support for gpio-keys does not help, and we cannot use drivers/base/power/wakeirq.c support. We need to implement custom wakeirq support for gpio-keys. For handling a dedicated wakeirq for system suspend, we enable and disable it with gpio_keys_enable_wakeup() and gpio_keys_disable_wakeup() that we already use based on device_may_wakeup(). Some systems may have a dedicated wakeirq that can also be used as the main interrupt, this is already working for gpio-keys. Let's add some wakeirq related comments while at it as the usage with a gpio line and separate interrupt line may not be obvious. Tested-by: Dhruva Gole <d-gole@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Link: https://lore.kernel.org/r/20231129110618.27551-2-tony@atomide.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _GPIO_KEYS_H
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#define _GPIO_KEYS_H
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#include <linux/types.h>
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struct device;
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/**
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* struct gpio_keys_button - configuration parameters
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* @code: input event code (KEY_*, SW_*)
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* @gpio: %-1 if this key does not support gpio
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* @active_low: %true indicates that button is considered
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* depressed when gpio is low
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* @desc: label that will be attached to button's gpio
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* @type: input event type (%EV_KEY, %EV_SW, %EV_ABS)
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* @wakeup: configure the button as a wake-up source
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* @wakeup_event_action: event action to trigger wakeup
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* @debounce_interval: debounce ticks interval in msecs
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* @can_disable: %true indicates that userspace is allowed to
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* disable button via sysfs
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* @value: axis value for %EV_ABS
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* @irq: Irq number in case of interrupt keys
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* @wakeirq: Optional dedicated wake-up interrupt
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*/
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struct gpio_keys_button {
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unsigned int code;
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int gpio;
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int active_low;
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const char *desc;
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unsigned int type;
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int wakeup;
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int wakeup_event_action;
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int debounce_interval;
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bool can_disable;
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int value;
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unsigned int irq;
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unsigned int wakeirq;
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};
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/**
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* struct gpio_keys_platform_data - platform data for gpio_keys driver
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* @buttons: pointer to array of &gpio_keys_button structures
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* describing buttons attached to the device
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* @nbuttons: number of elements in @buttons array
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* @poll_interval: polling interval in msecs - for polling driver only
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* @rep: enable input subsystem auto repeat
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* @enable: platform hook for enabling the device
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* @disable: platform hook for disabling the device
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* @name: input device name
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*/
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struct gpio_keys_platform_data {
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const struct gpio_keys_button *buttons;
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int nbuttons;
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unsigned int poll_interval;
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unsigned int rep:1;
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int (*enable)(struct device *dev);
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void (*disable)(struct device *dev);
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const char *name;
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};
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#endif
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