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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/input/misc/sgi_btns.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/input/misc/sgi_btns.c')
-rw-r--r-- | drivers/input/misc/sgi_btns.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/input/misc/sgi_btns.c b/drivers/input/misc/sgi_btns.c new file mode 100644 index 000000000..0657d785b --- /dev/null +++ b/drivers/input/misc/sgi_btns.c @@ -0,0 +1,131 @@ +// 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"); |