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// SPDX-License-Identifier: GPL-2.0-only
/*
*
* h3600 atmel micro companion support, key subdevice
* based on previous kernel 2.4 version
* Author : Alessandro Gardich <gremlin@gremlin.it>
* Author : Linus Walleij <linus.walleij@linaro.org>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/mfd/ipaq-micro.h>
struct ipaq_micro_keys {
struct ipaq_micro *micro;
struct input_dev *input;
u16 *codes;
};
static const u16 micro_keycodes[] = {
KEY_RECORD, /* 1: Record button */
KEY_CALENDAR, /* 2: Calendar */
KEY_ADDRESSBOOK, /* 3: Contacts (looks like Outlook) */
KEY_MAIL, /* 4: Envelope (Q on older iPAQs) */
KEY_HOMEPAGE, /* 5: Start (looks like swoopy arrow) */
KEY_UP, /* 6: Up */
KEY_RIGHT, /* 7: Right */
KEY_LEFT, /* 8: Left */
KEY_DOWN, /* 9: Down */
};
static void micro_key_receive(void *data, int len, unsigned char *msg)
{
struct ipaq_micro_keys *keys = data;
int key, down;
down = 0x80 & msg[0];
key = 0x7f & msg[0];
if (key < ARRAY_SIZE(micro_keycodes)) {
input_report_key(keys->input, keys->codes[key], down);
input_sync(keys->input);
}
}
static void micro_key_start(struct ipaq_micro_keys *keys)
{
guard(spinlock)(&keys->micro->lock);
keys->micro->key = micro_key_receive;
keys->micro->key_data = keys;
}
static void micro_key_stop(struct ipaq_micro_keys *keys)
{
guard(spinlock)(&keys->micro->lock);
keys->micro->key = NULL;
keys->micro->key_data = NULL;
}
static int micro_key_open(struct input_dev *input)
{
struct ipaq_micro_keys *keys = input_get_drvdata(input);
micro_key_start(keys);
return 0;
}
static void micro_key_close(struct input_dev *input)
{
struct ipaq_micro_keys *keys = input_get_drvdata(input);
micro_key_stop(keys);
}
static int micro_key_probe(struct platform_device *pdev)
{
struct ipaq_micro_keys *keys;
int error;
int i;
keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL);
if (!keys)
return -ENOMEM;
keys->micro = dev_get_drvdata(pdev->dev.parent);
keys->input = devm_input_allocate_device(&pdev->dev);
if (!keys->input)
return -ENOMEM;
keys->input->keycodesize = sizeof(micro_keycodes[0]);
keys->input->keycodemax = ARRAY_SIZE(micro_keycodes);
keys->codes = devm_kmemdup(&pdev->dev, micro_keycodes,
keys->input->keycodesize * keys->input->keycodemax,
GFP_KERNEL);
if (!keys->codes)
return -ENOMEM;
keys->input->keycode = keys->codes;
__set_bit(EV_KEY, keys->input->evbit);
for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++)
__set_bit(micro_keycodes[i], keys->input->keybit);
keys->input->name = "h3600 micro keys";
keys->input->open = micro_key_open;
keys->input->close = micro_key_close;
input_set_drvdata(keys->input, keys);
error = input_register_device(keys->input);
if (error)
return error;
platform_set_drvdata(pdev, keys);
return 0;
}
static int micro_key_suspend(struct device *dev)
{
struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
micro_key_stop(keys);
return 0;
}
static int micro_key_resume(struct device *dev)
{
struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
struct input_dev *input = keys->input;
guard(mutex)(&input->mutex);
if (input_device_enabled(input))
micro_key_start(keys);
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(micro_key_dev_pm_ops,
micro_key_suspend, micro_key_resume);
static struct platform_driver micro_key_device_driver = {
.driver = {
.name = "ipaq-micro-keys",
.pm = pm_sleep_ptr(µ_key_dev_pm_ops),
},
.probe = micro_key_probe,
};
module_platform_driver(micro_key_device_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("driver for iPAQ Atmel micro keys");
MODULE_ALIAS("platform:ipaq-micro-keys");
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