![Tobias Klauser](/assets/img/avatar_default.png)
Use the of_property_read_u32() helper function to retrieve u32 values from the device tree. Also do not pass the len parameter to of_get_property if it isn't checked afterwards. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
768 lines
19 KiB
C
768 lines
19 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/of_platform.h>
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#include <linux/of_gpio.h>
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struct gpio_button_data {
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struct gpio_keys_button *button;
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struct input_dev *input;
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struct timer_list timer;
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struct work_struct work;
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int timer_debounce; /* in msecs */
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bool disabled;
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};
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struct gpio_keys_drvdata {
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struct input_dev *input;
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struct mutex disable_lock;
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unsigned int n_buttons;
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int (*enable)(struct device *dev);
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void (*disable)(struct device *dev);
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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 inline 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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* 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 possible debouncing timer.
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*/
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disable_irq(gpio_to_irq(bdata->button->gpio));
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if (bdata->timer_debounce)
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del_timer_sync(&bdata->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(gpio_to_irq(bdata->button->gpio));
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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->n_buttons; 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->button->code, bits);
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}
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ret = bitmap_scnlistprintf(buf, PAGE_SIZE - 2, bits, n_events);
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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 accordinly. 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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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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for (i = 0; i < ddata->n_buttons; 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->button->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->n_buttons; 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->button->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 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_report_event(struct gpio_button_data *bdata)
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{
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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 = (gpio_get_value_cansleep(button->gpio) ? 1 : 0) ^ button->active_low;
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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, button->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_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);
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gpio_keys_report_event(bdata);
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}
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static void gpio_keys_timer(unsigned long _data)
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{
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struct gpio_button_data *data = (struct gpio_button_data *)_data;
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schedule_work(&data->work);
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}
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static irqreturn_t gpio_keys_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 gpio_keys_button *button = bdata->button;
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BUG_ON(irq != gpio_to_irq(button->gpio));
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if (bdata->timer_debounce)
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mod_timer(&bdata->timer,
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jiffies + msecs_to_jiffies(bdata->timer_debounce));
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else
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schedule_work(&bdata->work);
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return IRQ_HANDLED;
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}
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static int __devinit gpio_keys_setup_key(struct platform_device *pdev,
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struct gpio_button_data *bdata,
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struct gpio_keys_button *button)
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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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unsigned long irqflags;
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int irq, error;
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setup_timer(&bdata->timer, gpio_keys_timer, (unsigned long)bdata);
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INIT_WORK(&bdata->work, gpio_keys_work_func);
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error = gpio_request(button->gpio, desc);
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if (error < 0) {
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dev_err(dev, "failed to request GPIO %d, error %d\n",
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button->gpio, error);
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goto fail2;
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}
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error = gpio_direction_input(button->gpio);
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if (error < 0) {
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dev_err(dev, "failed to configure"
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" direction for GPIO %d, error %d\n",
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button->gpio, error);
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goto fail3;
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}
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if (button->debounce_interval) {
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error = gpio_set_debounce(button->gpio,
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button->debounce_interval * 1000);
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/* use timer if gpiolib doesn't provide debounce */
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if (error < 0)
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bdata->timer_debounce = button->debounce_interval;
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}
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irq = gpio_to_irq(button->gpio);
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if (irq < 0) {
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error = irq;
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dev_err(dev, "Unable to get irq number for GPIO %d, error %d\n",
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button->gpio, error);
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goto fail3;
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}
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irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
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/*
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* If platform has specified that the button can be disabled,
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* we don't want it to share the interrupt line.
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*/
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if (!button->can_disable)
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irqflags |= IRQF_SHARED;
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error = request_threaded_irq(irq, NULL, gpio_keys_isr, irqflags, desc, bdata);
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if (error < 0) {
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dev_err(dev, "Unable to claim irq %d; error %d\n",
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irq, error);
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goto fail3;
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}
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return 0;
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fail3:
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gpio_free(button->gpio);
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fail2:
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return error;
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}
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static int gpio_keys_open(struct input_dev *input)
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{
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struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
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return ddata->enable ? ddata->enable(input->dev.parent) : 0;
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}
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static void gpio_keys_close(struct input_dev *input)
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{
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struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
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if (ddata->disable)
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ddata->disable(input->dev.parent);
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}
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/*
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* Handlers for alternative sources of platform_data
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*/
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#ifdef CONFIG_OF
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/*
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* Translate OpenFirmware node properties into platform_data
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*/
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static int gpio_keys_get_devtree_pdata(struct device *dev,
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struct gpio_keys_platform_data *pdata)
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{
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struct device_node *node, *pp;
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int i;
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struct gpio_keys_button *buttons;
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u32 reg;
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node = dev->of_node;
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if (node == NULL)
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return -ENODEV;
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memset(pdata, 0, sizeof *pdata);
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pdata->rep = !!of_get_property(node, "autorepeat", NULL);
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/* First count the subnodes */
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pdata->nbuttons = 0;
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pp = NULL;
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while ((pp = of_get_next_child(node, pp)))
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pdata->nbuttons++;
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if (pdata->nbuttons == 0)
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return -ENODEV;
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buttons = kzalloc(pdata->nbuttons * (sizeof *buttons), GFP_KERNEL);
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if (!buttons)
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return -ENOMEM;
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pp = NULL;
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i = 0;
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while ((pp = of_get_next_child(node, pp))) {
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enum of_gpio_flags flags;
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if (!of_find_property(pp, "gpios", NULL)) {
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pdata->nbuttons--;
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dev_warn(dev, "Found button without gpios\n");
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continue;
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}
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buttons[i].gpio = of_get_gpio_flags(pp, 0, &flags);
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buttons[i].active_low = flags & OF_GPIO_ACTIVE_LOW;
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if (of_property_read_u32(pp, "linux,code", ®)) {
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dev_err(dev, "Button without keycode: 0x%x\n", buttons[i].gpio);
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goto out_fail;
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}
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buttons[i].code = reg;
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buttons[i].desc = of_get_property(pp, "label", NULL);
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if (of_property_read_u32(pp, "linux,input-type", ®) == 0)
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buttons[i].type = reg;
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else
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buttons[i].type = EV_KEY;
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buttons[i].wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL);
|
|
|
|
if (of_property_read_u32(pp, "debounce-interval", ®) == 0)
|
|
buttons[i].debounce_interval = reg;
|
|
else
|
|
buttons[i].debounce_interval = 5;
|
|
|
|
i++;
|
|
}
|
|
|
|
pdata->buttons = buttons;
|
|
|
|
return 0;
|
|
|
|
out_fail:
|
|
kfree(buttons);
|
|
return -ENODEV;
|
|
}
|
|
|
|
static struct of_device_id gpio_keys_of_match[] = {
|
|
{ .compatible = "gpio-keys", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, gpio_keys_of_match);
|
|
|
|
#else
|
|
|
|
static int gpio_keys_get_devtree_pdata(struct device *dev,
|
|
struct gpio_keys_platform_data *altp)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
#define gpio_keys_of_match NULL
|
|
|
|
#endif
|
|
|
|
static int __devinit gpio_keys_probe(struct platform_device *pdev)
|
|
{
|
|
struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
|
|
struct gpio_keys_drvdata *ddata;
|
|
struct device *dev = &pdev->dev;
|
|
struct gpio_keys_platform_data alt_pdata;
|
|
struct input_dev *input;
|
|
int i, error;
|
|
int wakeup = 0;
|
|
|
|
if (!pdata) {
|
|
error = gpio_keys_get_devtree_pdata(dev, &alt_pdata);
|
|
if (error)
|
|
return error;
|
|
pdata = &alt_pdata;
|
|
}
|
|
|
|
ddata = kzalloc(sizeof(struct gpio_keys_drvdata) +
|
|
pdata->nbuttons * sizeof(struct gpio_button_data),
|
|
GFP_KERNEL);
|
|
input = input_allocate_device();
|
|
if (!ddata || !input) {
|
|
dev_err(dev, "failed to allocate state\n");
|
|
error = -ENOMEM;
|
|
goto fail1;
|
|
}
|
|
|
|
ddata->input = input;
|
|
ddata->n_buttons = pdata->nbuttons;
|
|
ddata->enable = pdata->enable;
|
|
ddata->disable = pdata->disable;
|
|
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 = &pdev->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;
|
|
|
|
/* Enable auto repeat feature of Linux input subsystem */
|
|
if (pdata->rep)
|
|
__set_bit(EV_REP, input->evbit);
|
|
|
|
for (i = 0; i < pdata->nbuttons; i++) {
|
|
struct gpio_keys_button *button = &pdata->buttons[i];
|
|
struct gpio_button_data *bdata = &ddata->data[i];
|
|
unsigned int type = button->type ?: EV_KEY;
|
|
|
|
bdata->input = input;
|
|
bdata->button = button;
|
|
|
|
error = gpio_keys_setup_key(pdev, bdata, button);
|
|
if (error)
|
|
goto fail2;
|
|
|
|
if (button->wakeup)
|
|
wakeup = 1;
|
|
|
|
input_set_capability(input, type, button->code);
|
|
}
|
|
|
|
error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group);
|
|
if (error) {
|
|
dev_err(dev, "Unable to export keys/switches, error: %d\n",
|
|
error);
|
|
goto fail2;
|
|
}
|
|
|
|
error = input_register_device(input);
|
|
if (error) {
|
|
dev_err(dev, "Unable to register input device, error: %d\n",
|
|
error);
|
|
goto fail3;
|
|
}
|
|
|
|
/* get current state of buttons */
|
|
for (i = 0; i < pdata->nbuttons; i++)
|
|
gpio_keys_report_event(&ddata->data[i]);
|
|
input_sync(input);
|
|
|
|
device_init_wakeup(&pdev->dev, wakeup);
|
|
|
|
return 0;
|
|
|
|
fail3:
|
|
sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
|
|
fail2:
|
|
while (--i >= 0) {
|
|
free_irq(gpio_to_irq(pdata->buttons[i].gpio), &ddata->data[i]);
|
|
if (ddata->data[i].timer_debounce)
|
|
del_timer_sync(&ddata->data[i].timer);
|
|
cancel_work_sync(&ddata->data[i].work);
|
|
gpio_free(pdata->buttons[i].gpio);
|
|
}
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
fail1:
|
|
input_free_device(input);
|
|
kfree(ddata);
|
|
/* If we have no platform_data, we allocated buttons dynamically. */
|
|
if (!pdev->dev.platform_data)
|
|
kfree(pdata->buttons);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int __devexit gpio_keys_remove(struct platform_device *pdev)
|
|
{
|
|
struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
|
|
struct input_dev *input = ddata->input;
|
|
int i;
|
|
|
|
sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
|
|
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
|
|
for (i = 0; i < ddata->n_buttons; i++) {
|
|
int irq = gpio_to_irq(ddata->data[i].button->gpio);
|
|
free_irq(irq, &ddata->data[i]);
|
|
if (ddata->data[i].timer_debounce)
|
|
del_timer_sync(&ddata->data[i].timer);
|
|
cancel_work_sync(&ddata->data[i].work);
|
|
gpio_free(ddata->data[i].button->gpio);
|
|
}
|
|
|
|
input_unregister_device(input);
|
|
|
|
/*
|
|
* If we had no platform_data, we allocated buttons dynamically, and
|
|
* must free them here. ddata->data[0].button is the pointer to the
|
|
* beginning of the allocated array.
|
|
*/
|
|
if (!pdev->dev.platform_data)
|
|
kfree(ddata->data[0].button);
|
|
|
|
kfree(ddata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int gpio_keys_suspend(struct device *dev)
|
|
{
|
|
struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
|
|
int i;
|
|
|
|
if (device_may_wakeup(dev)) {
|
|
for (i = 0; i < ddata->n_buttons; i++) {
|
|
struct gpio_keys_button *button = ddata->data[i].button;
|
|
if (button->wakeup) {
|
|
int irq = gpio_to_irq(button->gpio);
|
|
enable_irq_wake(irq);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_keys_resume(struct device *dev)
|
|
{
|
|
struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
|
|
int i;
|
|
|
|
for (i = 0; i < ddata->n_buttons; i++) {
|
|
|
|
struct gpio_keys_button *button = ddata->data[i].button;
|
|
if (button->wakeup && device_may_wakeup(dev)) {
|
|
int irq = gpio_to_irq(button->gpio);
|
|
disable_irq_wake(irq);
|
|
}
|
|
|
|
gpio_keys_report_event(&ddata->data[i]);
|
|
}
|
|
input_sync(ddata->input);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
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 = __devexit_p(gpio_keys_remove),
|
|
.driver = {
|
|
.name = "gpio-keys",
|
|
.owner = THIS_MODULE,
|
|
.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");
|