![stephen lu](/assets/img/avatar_default.png)
In preparation for unconditionally passing the struct timer_list pointer to all timer callbacks, switch to using the new timer_setup() and from_timer() to pass the timer pointer explicitly. Signed-off-by: Stephen Lu <lumotuwe@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
927 lines
23 KiB
C
927 lines
23 KiB
C
/*
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* Driver for keys on GPIO lines capable of generating interrupts.
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*
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* Copyright 2005 Phil Blundell
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* Copyright 2010, 2011 David Jander <david@protonic.nl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/sched.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/proc_fs.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/gpio_keys.h>
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#include <linux/workqueue.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/spinlock.h>
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struct gpio_button_data {
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const struct gpio_keys_button *button;
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struct input_dev *input;
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struct gpio_desc *gpiod;
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unsigned short *code;
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struct timer_list release_timer;
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unsigned int release_delay; /* in msecs, for IRQ-only buttons */
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struct delayed_work work;
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unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */
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unsigned int irq;
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spinlock_t lock;
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bool disabled;
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bool key_pressed;
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bool suspended;
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};
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struct gpio_keys_drvdata {
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const struct gpio_keys_platform_data *pdata;
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struct input_dev *input;
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struct mutex disable_lock;
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unsigned short *keymap;
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struct gpio_button_data data[0];
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};
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/*
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* SYSFS interface for enabling/disabling keys and switches:
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*
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* There are 4 attributes under /sys/devices/platform/gpio-keys/
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* keys [ro] - bitmap of keys (EV_KEY) which can be
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* disabled
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* switches [ro] - bitmap of switches (EV_SW) which can be
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* disabled
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* disabled_keys [rw] - bitmap of keys currently disabled
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* disabled_switches [rw] - bitmap of switches currently disabled
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*
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* Userland can change these values and hence disable event generation
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* for each key (or switch). Disabling a key means its interrupt line
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* is disabled.
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*
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* For example, if we have following switches set up as gpio-keys:
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* SW_DOCK = 5
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* SW_CAMERA_LENS_COVER = 9
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* SW_KEYPAD_SLIDE = 10
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* SW_FRONT_PROXIMITY = 11
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* This is read from switches:
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* 11-9,5
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* Next we want to disable proximity (11) and dock (5), we write:
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* 11,5
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* to file disabled_switches. Now proximity and dock IRQs are disabled.
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* This can be verified by reading the file disabled_switches:
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* 11,5
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* If we now want to enable proximity (11) switch we write:
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* 5
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* to disabled_switches.
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*
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* We can disable only those keys which don't allow sharing the irq.
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*/
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/**
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* get_n_events_by_type() - returns maximum number of events per @type
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* @type: type of button (%EV_KEY, %EV_SW)
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*
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* Return value of this function can be used to allocate bitmap
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* large enough to hold all bits for given type.
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*/
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static int get_n_events_by_type(int type)
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{
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BUG_ON(type != EV_SW && type != EV_KEY);
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return (type == EV_KEY) ? KEY_CNT : SW_CNT;
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}
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/**
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* get_bm_events_by_type() - returns bitmap of supported events per @type
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* @input: input device from which bitmap is retrieved
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* @type: type of button (%EV_KEY, %EV_SW)
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*
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* Return value of this function can be used to allocate bitmap
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* large enough to hold all bits for given type.
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*/
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static const unsigned long *get_bm_events_by_type(struct input_dev *dev,
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int type)
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{
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BUG_ON(type != EV_SW && type != EV_KEY);
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return (type == EV_KEY) ? dev->keybit : dev->swbit;
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}
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/**
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* gpio_keys_disable_button() - disables given GPIO button
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* @bdata: button data for button to be disabled
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*
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* Disables button pointed by @bdata. This is done by masking
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* IRQ line. After this function is called, button won't generate
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* input events anymore. Note that one can only disable buttons
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* that don't share IRQs.
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*
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* Make sure that @bdata->disable_lock is locked when entering
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* this function to avoid races when concurrent threads are
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* disabling buttons at the same time.
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*/
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static void gpio_keys_disable_button(struct gpio_button_data *bdata)
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{
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if (!bdata->disabled) {
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/*
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* Disable IRQ and associated timer/work structure.
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*/
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disable_irq(bdata->irq);
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if (bdata->gpiod)
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cancel_delayed_work_sync(&bdata->work);
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else
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del_timer_sync(&bdata->release_timer);
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bdata->disabled = true;
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}
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}
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/**
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* gpio_keys_enable_button() - enables given GPIO button
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* @bdata: button data for button to be disabled
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*
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* Enables given button pointed by @bdata.
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*
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* Make sure that @bdata->disable_lock is locked when entering
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* this function to avoid races with concurrent threads trying
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* to enable the same button at the same time.
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*/
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static void gpio_keys_enable_button(struct gpio_button_data *bdata)
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{
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if (bdata->disabled) {
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enable_irq(bdata->irq);
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bdata->disabled = false;
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}
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}
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/**
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* gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons
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* @ddata: pointer to drvdata
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* @buf: buffer where stringified bitmap is written
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* @type: button type (%EV_KEY, %EV_SW)
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* @only_disabled: does caller want only those buttons that are
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* currently disabled or all buttons that can be
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* disabled
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*
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* This function writes buttons that can be disabled to @buf. If
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* @only_disabled is true, then @buf contains only those buttons
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* that are currently disabled. Returns 0 on success or negative
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* errno on failure.
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*/
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static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata,
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char *buf, unsigned int type,
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bool only_disabled)
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{
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int n_events = get_n_events_by_type(type);
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unsigned long *bits;
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ssize_t ret;
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int i;
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bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL);
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if (!bits)
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return -ENOMEM;
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for (i = 0; i < ddata->pdata->nbuttons; i++) {
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struct gpio_button_data *bdata = &ddata->data[i];
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if (bdata->button->type != type)
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continue;
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if (only_disabled && !bdata->disabled)
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continue;
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__set_bit(*bdata->code, bits);
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}
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ret = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", n_events, bits);
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buf[ret++] = '\n';
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buf[ret] = '\0';
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kfree(bits);
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return ret;
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}
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/**
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* gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap
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* @ddata: pointer to drvdata
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* @buf: buffer from userspace that contains stringified bitmap
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* @type: button type (%EV_KEY, %EV_SW)
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*
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* This function parses stringified bitmap from @buf and disables/enables
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* GPIO buttons accordingly. Returns 0 on success and negative error
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* on failure.
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*/
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static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata,
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const char *buf, unsigned int type)
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{
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int n_events = get_n_events_by_type(type);
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const unsigned long *bitmap = get_bm_events_by_type(ddata->input, type);
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unsigned long *bits;
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ssize_t error;
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int i;
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bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL);
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if (!bits)
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return -ENOMEM;
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error = bitmap_parselist(buf, bits, n_events);
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if (error)
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goto out;
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/* First validate */
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if (!bitmap_subset(bits, bitmap, n_events)) {
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error = -EINVAL;
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goto out;
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}
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for (i = 0; i < ddata->pdata->nbuttons; i++) {
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struct gpio_button_data *bdata = &ddata->data[i];
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if (bdata->button->type != type)
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continue;
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if (test_bit(*bdata->code, bits) &&
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!bdata->button->can_disable) {
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error = -EINVAL;
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goto out;
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}
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}
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mutex_lock(&ddata->disable_lock);
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for (i = 0; i < ddata->pdata->nbuttons; i++) {
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struct gpio_button_data *bdata = &ddata->data[i];
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if (bdata->button->type != type)
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continue;
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if (test_bit(*bdata->code, bits))
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gpio_keys_disable_button(bdata);
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else
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gpio_keys_enable_button(bdata);
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}
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mutex_unlock(&ddata->disable_lock);
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out:
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kfree(bits);
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return error;
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}
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#define ATTR_SHOW_FN(name, type, only_disabled) \
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static ssize_t gpio_keys_show_##name(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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struct platform_device *pdev = to_platform_device(dev); \
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struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
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\
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return gpio_keys_attr_show_helper(ddata, buf, \
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type, only_disabled); \
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}
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ATTR_SHOW_FN(keys, EV_KEY, false);
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ATTR_SHOW_FN(switches, EV_SW, false);
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ATTR_SHOW_FN(disabled_keys, EV_KEY, true);
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ATTR_SHOW_FN(disabled_switches, EV_SW, true);
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/*
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* ATTRIBUTES:
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*
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* /sys/devices/platform/gpio-keys/keys [ro]
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* /sys/devices/platform/gpio-keys/switches [ro]
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*/
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static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL);
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static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL);
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#define ATTR_STORE_FN(name, type) \
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static ssize_t gpio_keys_store_##name(struct device *dev, \
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struct device_attribute *attr, \
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const char *buf, \
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size_t count) \
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{ \
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struct platform_device *pdev = to_platform_device(dev); \
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struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
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ssize_t error; \
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\
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error = gpio_keys_attr_store_helper(ddata, buf, type); \
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if (error) \
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return error; \
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\
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return count; \
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}
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ATTR_STORE_FN(disabled_keys, EV_KEY);
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ATTR_STORE_FN(disabled_switches, EV_SW);
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/*
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* ATTRIBUTES:
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*
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* /sys/devices/platform/gpio-keys/disabled_keys [rw]
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* /sys/devices/platform/gpio-keys/disables_switches [rw]
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*/
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static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO,
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gpio_keys_show_disabled_keys,
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gpio_keys_store_disabled_keys);
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static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO,
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gpio_keys_show_disabled_switches,
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gpio_keys_store_disabled_switches);
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static struct attribute *gpio_keys_attrs[] = {
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&dev_attr_keys.attr,
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&dev_attr_switches.attr,
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&dev_attr_disabled_keys.attr,
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&dev_attr_disabled_switches.attr,
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NULL,
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};
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static const struct attribute_group gpio_keys_attr_group = {
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.attrs = gpio_keys_attrs,
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};
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static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
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{
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const struct gpio_keys_button *button = bdata->button;
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struct input_dev *input = bdata->input;
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unsigned int type = button->type ?: EV_KEY;
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int state;
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state = gpiod_get_value_cansleep(bdata->gpiod);
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if (state < 0) {
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dev_err(input->dev.parent,
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"failed to get gpio state: %d\n", state);
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return;
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}
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if (type == EV_ABS) {
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if (state)
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input_event(input, type, button->code, button->value);
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} else {
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input_event(input, type, *bdata->code, state);
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}
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input_sync(input);
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}
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static void gpio_keys_gpio_work_func(struct work_struct *work)
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{
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struct gpio_button_data *bdata =
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container_of(work, struct gpio_button_data, work.work);
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gpio_keys_gpio_report_event(bdata);
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if (bdata->button->wakeup)
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pm_relax(bdata->input->dev.parent);
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}
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static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)
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{
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struct gpio_button_data *bdata = dev_id;
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BUG_ON(irq != bdata->irq);
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if (bdata->button->wakeup) {
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const struct gpio_keys_button *button = bdata->button;
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pm_stay_awake(bdata->input->dev.parent);
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if (bdata->suspended &&
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(button->type == 0 || button->type == EV_KEY)) {
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/*
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* Simulate wakeup key press in case the key has
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* already released by the time we got interrupt
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* handler to run.
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*/
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input_report_key(bdata->input, button->code, 1);
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}
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}
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mod_delayed_work(system_wq,
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&bdata->work,
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msecs_to_jiffies(bdata->software_debounce));
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return IRQ_HANDLED;
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}
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static void gpio_keys_irq_timer(struct timer_list *t)
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{
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struct gpio_button_data *bdata = from_timer(bdata, t, release_timer);
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struct input_dev *input = bdata->input;
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unsigned long flags;
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spin_lock_irqsave(&bdata->lock, flags);
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if (bdata->key_pressed) {
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input_event(input, EV_KEY, *bdata->code, 0);
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input_sync(input);
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bdata->key_pressed = false;
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}
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spin_unlock_irqrestore(&bdata->lock, flags);
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}
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static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
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{
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struct gpio_button_data *bdata = dev_id;
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struct input_dev *input = bdata->input;
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unsigned long flags;
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BUG_ON(irq != bdata->irq);
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spin_lock_irqsave(&bdata->lock, flags);
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if (!bdata->key_pressed) {
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if (bdata->button->wakeup)
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pm_wakeup_event(bdata->input->dev.parent, 0);
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input_event(input, EV_KEY, *bdata->code, 1);
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input_sync(input);
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if (!bdata->release_delay) {
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input_event(input, EV_KEY, *bdata->code, 0);
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input_sync(input);
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goto out;
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}
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bdata->key_pressed = true;
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}
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if (bdata->release_delay)
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mod_timer(&bdata->release_timer,
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jiffies + msecs_to_jiffies(bdata->release_delay));
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out:
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spin_unlock_irqrestore(&bdata->lock, flags);
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return IRQ_HANDLED;
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}
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static void gpio_keys_quiesce_key(void *data)
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{
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struct gpio_button_data *bdata = data;
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if (bdata->gpiod)
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cancel_delayed_work_sync(&bdata->work);
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else
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del_timer_sync(&bdata->release_timer);
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}
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static int gpio_keys_setup_key(struct platform_device *pdev,
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struct input_dev *input,
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struct gpio_keys_drvdata *ddata,
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const struct gpio_keys_button *button,
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int idx,
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struct fwnode_handle *child)
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{
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const char *desc = button->desc ? button->desc : "gpio_keys";
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struct device *dev = &pdev->dev;
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struct gpio_button_data *bdata = &ddata->data[idx];
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irq_handler_t isr;
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unsigned long irqflags;
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int irq;
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int error;
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bdata->input = input;
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bdata->button = button;
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spin_lock_init(&bdata->lock);
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if (child) {
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bdata->gpiod = devm_fwnode_get_gpiod_from_child(dev, NULL,
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child,
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GPIOD_IN,
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desc);
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if (IS_ERR(bdata->gpiod)) {
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error = PTR_ERR(bdata->gpiod);
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if (error == -ENOENT) {
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/*
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* GPIO is optional, we may be dealing with
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* purely interrupt-driven setup.
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*/
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bdata->gpiod = NULL;
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} else {
|
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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;
|
|
timer_setup(&bdata->release_timer, gpio_keys_irq_timer, 0);
|
|
|
|
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 = devm_device_add_group(dev, &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);
|
|
return error;
|
|
}
|
|
|
|
device_init_wakeup(dev, wakeup);
|
|
|
|
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,
|
|
.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");
|