132 lines
2.8 KiB
C
132 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* SGI Volume Button interface driver
|
|
*
|
|
* Copyright (C) 2008 Thomas Bogendoerfer <tsbogend@alpha.franken.de>
|
|
*/
|
|
#include <linux/input.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
#ifdef CONFIG_SGI_IP22
|
|
#include <asm/sgi/ioc.h>
|
|
|
|
static inline u8 button_status(void)
|
|
{
|
|
u8 status;
|
|
|
|
status = readb(&sgioc->panel) ^ 0xa0;
|
|
return ((status & 0x80) >> 6) | ((status & 0x20) >> 5);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SGI_IP32
|
|
#include <asm/ip32/mace.h>
|
|
|
|
static inline u8 button_status(void)
|
|
{
|
|
u64 status;
|
|
|
|
status = readq(&mace->perif.audio.control);
|
|
writeq(status & ~(3U << 23), &mace->perif.audio.control);
|
|
|
|
return (status >> 23) & 3;
|
|
}
|
|
#endif
|
|
|
|
#define BUTTONS_POLL_INTERVAL 30 /* msec */
|
|
#define BUTTONS_COUNT_THRESHOLD 3
|
|
|
|
static const unsigned short sgi_map[] = {
|
|
KEY_VOLUMEDOWN,
|
|
KEY_VOLUMEUP
|
|
};
|
|
|
|
struct buttons_dev {
|
|
unsigned short keymap[ARRAY_SIZE(sgi_map)];
|
|
int count[ARRAY_SIZE(sgi_map)];
|
|
};
|
|
|
|
static void handle_buttons(struct input_dev *input)
|
|
{
|
|
struct buttons_dev *bdev = input_get_drvdata(input);
|
|
u8 status;
|
|
int i;
|
|
|
|
status = button_status();
|
|
|
|
for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
|
|
if (status & (1U << i)) {
|
|
if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
|
|
input_event(input, EV_MSC, MSC_SCAN, i);
|
|
input_report_key(input, bdev->keymap[i], 1);
|
|
input_sync(input);
|
|
}
|
|
} else {
|
|
if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
|
|
input_event(input, EV_MSC, MSC_SCAN, i);
|
|
input_report_key(input, bdev->keymap[i], 0);
|
|
input_sync(input);
|
|
}
|
|
bdev->count[i] = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int sgi_buttons_probe(struct platform_device *pdev)
|
|
{
|
|
struct buttons_dev *bdev;
|
|
struct input_dev *input;
|
|
int error, i;
|
|
|
|
bdev = devm_kzalloc(&pdev->dev, sizeof(*bdev), GFP_KERNEL);
|
|
if (!bdev)
|
|
return -ENOMEM;
|
|
|
|
input = devm_input_allocate_device(&pdev->dev);
|
|
if (!input)
|
|
return -ENOMEM;
|
|
|
|
memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap));
|
|
|
|
input_set_drvdata(input, bdev);
|
|
|
|
input->name = "SGI buttons";
|
|
input->phys = "sgi/input0";
|
|
input->id.bustype = BUS_HOST;
|
|
|
|
input->keycode = bdev->keymap;
|
|
input->keycodemax = ARRAY_SIZE(bdev->keymap);
|
|
input->keycodesize = sizeof(unsigned short);
|
|
|
|
input_set_capability(input, EV_MSC, MSC_SCAN);
|
|
__set_bit(EV_KEY, input->evbit);
|
|
for (i = 0; i < ARRAY_SIZE(sgi_map); i++)
|
|
__set_bit(bdev->keymap[i], input->keybit);
|
|
__clear_bit(KEY_RESERVED, input->keybit);
|
|
|
|
error = input_setup_polling(input, handle_buttons);
|
|
if (error)
|
|
return error;
|
|
|
|
input_set_poll_interval(input, BUTTONS_POLL_INTERVAL);
|
|
|
|
error = input_register_device(input);
|
|
if (error)
|
|
return error;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver sgi_buttons_driver = {
|
|
.probe = sgi_buttons_probe,
|
|
.driver = {
|
|
.name = "sgibtns",
|
|
},
|
|
};
|
|
module_platform_driver(sgi_buttons_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|