diff options
Diffstat (limited to 'drivers/input/misc/sgi_btns.c')
| -rw-r--r-- | drivers/input/misc/sgi_btns.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/drivers/input/misc/sgi_btns.c b/drivers/input/misc/sgi_btns.c new file mode 100644 index 000000000000..ce238f59b3c8 --- /dev/null +++ b/drivers/input/misc/sgi_btns.c @@ -0,0 +1,178 @@ +/* + * SGI Volume Button interface driver + * + * Copyright (C) 2008 Thomas Bogendoerfer <tsbogend@alpha.franken.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include <linux/init.h> +#include <linux/input-polldev.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/platform_device.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 { + struct input_polled_dev *poll_dev; + unsigned short keymap[ARRAY_SIZE(sgi_map)]; + int count[ARRAY_SIZE(sgi_map)]; +}; + +static void handle_buttons(struct input_polled_dev *dev) +{ + struct buttons_dev *bdev = dev->private; + struct input_dev *input = dev->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 __devinit sgi_buttons_probe(struct platform_device *pdev) +{ + struct buttons_dev *bdev; + struct input_polled_dev *poll_dev; + struct input_dev *input; + int error, i; + + bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL); + poll_dev = input_allocate_polled_device(); + if (!bdev || !poll_dev) { + error = -ENOMEM; + goto err_free_mem; + } + + memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap)); + + poll_dev->private = bdev; + poll_dev->poll = handle_buttons; + poll_dev->poll_interval = BUTTONS_POLL_INTERVAL; + + input = poll_dev->input; + input->name = "SGI buttons"; + input->phys = "sgi/input0"; + input->id.bustype = BUS_HOST; + input->dev.parent = &pdev->dev; + + 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); + + bdev->poll_dev = poll_dev; + dev_set_drvdata(&pdev->dev, bdev); + + error = input_register_polled_device(poll_dev); + if (error) + goto err_free_mem; + + return 0; + + err_free_mem: + input_free_polled_device(poll_dev); + kfree(bdev); + dev_set_drvdata(&pdev->dev, NULL); + return error; +} + +static int __devexit sgi_buttons_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct buttons_dev *bdev = dev_get_drvdata(dev); + + input_unregister_polled_device(bdev->poll_dev); + input_free_polled_device(bdev->poll_dev); + kfree(bdev); + dev_set_drvdata(dev, NULL); + + return 0; +} + +static struct platform_driver sgi_buttons_driver = { + .probe = sgi_buttons_probe, + .remove = __devexit_p(sgi_buttons_remove), + .driver = { + .name = "sgibtns", + .owner = THIS_MODULE, + }, +}; + +static int __init sgi_buttons_init(void) +{ + return platform_driver_register(&sgi_buttons_driver); +} + +static void __exit sgi_buttons_exit(void) +{ + platform_driver_unregister(&sgi_buttons_driver); +} + +module_init(sgi_buttons_init); +module_exit(sgi_buttons_exit); |
