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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133// 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_DESCRIPTION("SGI Indy/O2 volume button interface driver");MODULE_LICENSE("GPL");