Thomas Gleixner | 1621633 | 2019-05-19 15:51:31 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 2 | /* |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 3 | * SGI Volume Button interface driver |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 4 | * |
| 5 | * Copyright (C) 2008 Thomas Bogendoerfer <tsbogend@alpha.franken.de> |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 6 | */ |
Dmitry Torokhov | aede7a1 | 2019-10-29 17:04:18 -0700 | [diff] [blame] | 7 | #include <linux/input.h> |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 8 | #include <linux/ioport.h> |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/platform_device.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 11 | #include <linux/slab.h> |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 12 | |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 13 | #ifdef CONFIG_SGI_IP22 |
| 14 | #include <asm/sgi/ioc.h> |
| 15 | |
| 16 | static inline u8 button_status(void) |
| 17 | { |
| 18 | u8 status; |
| 19 | |
| 20 | status = readb(&sgioc->panel) ^ 0xa0; |
| 21 | return ((status & 0x80) >> 6) | ((status & 0x20) >> 5); |
| 22 | } |
| 23 | #endif |
| 24 | |
| 25 | #ifdef CONFIG_SGI_IP32 |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 26 | #include <asm/ip32/mace.h> |
| 27 | |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 28 | static inline u8 button_status(void) |
| 29 | { |
| 30 | u64 status; |
| 31 | |
| 32 | status = readq(&mace->perif.audio.control); |
| 33 | writeq(status & ~(3U << 23), &mace->perif.audio.control); |
| 34 | |
| 35 | return (status >> 23) & 3; |
| 36 | } |
| 37 | #endif |
| 38 | |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 39 | #define BUTTONS_POLL_INTERVAL 30 /* msec */ |
| 40 | #define BUTTONS_COUNT_THRESHOLD 3 |
| 41 | |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 42 | static const unsigned short sgi_map[] = { |
| 43 | KEY_VOLUMEDOWN, |
| 44 | KEY_VOLUMEUP |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 45 | }; |
| 46 | |
| 47 | struct buttons_dev { |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 48 | unsigned short keymap[ARRAY_SIZE(sgi_map)]; |
| 49 | int count[ARRAY_SIZE(sgi_map)]; |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 50 | }; |
| 51 | |
Dmitry Torokhov | aede7a1 | 2019-10-29 17:04:18 -0700 | [diff] [blame] | 52 | static void handle_buttons(struct input_dev *input) |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 53 | { |
Dmitry Torokhov | aede7a1 | 2019-10-29 17:04:18 -0700 | [diff] [blame] | 54 | struct buttons_dev *bdev = input_get_drvdata(input); |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 55 | u8 status; |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 56 | int i; |
| 57 | |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 58 | status = button_status(); |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 59 | |
| 60 | for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) { |
| 61 | if (status & (1U << i)) { |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 62 | if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) { |
| 63 | input_event(input, EV_MSC, MSC_SCAN, i); |
| 64 | input_report_key(input, bdev->keymap[i], 1); |
| 65 | input_sync(input); |
| 66 | } |
| 67 | } else { |
| 68 | if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) { |
| 69 | input_event(input, EV_MSC, MSC_SCAN, i); |
| 70 | input_report_key(input, bdev->keymap[i], 0); |
| 71 | input_sync(input); |
| 72 | } |
| 73 | bdev->count[i] = 0; |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 78 | static int sgi_buttons_probe(struct platform_device *pdev) |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 79 | { |
| 80 | struct buttons_dev *bdev; |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 81 | struct input_dev *input; |
| 82 | int error, i; |
| 83 | |
Dmitry Torokhov | 9e085dd | 2019-10-29 17:04:10 -0700 | [diff] [blame] | 84 | bdev = devm_kzalloc(&pdev->dev, sizeof(*bdev), GFP_KERNEL); |
| 85 | if (!bdev) |
| 86 | return -ENOMEM; |
| 87 | |
Dmitry Torokhov | aede7a1 | 2019-10-29 17:04:18 -0700 | [diff] [blame] | 88 | input = devm_input_allocate_device(&pdev->dev); |
| 89 | if (!input) |
Dmitry Torokhov | 9e085dd | 2019-10-29 17:04:10 -0700 | [diff] [blame] | 90 | return -ENOMEM; |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 91 | |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 92 | memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap)); |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 93 | |
Dmitry Torokhov | aede7a1 | 2019-10-29 17:04:18 -0700 | [diff] [blame] | 94 | input_set_drvdata(input, bdev); |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 95 | |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 96 | input->name = "SGI buttons"; |
| 97 | input->phys = "sgi/input0"; |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 98 | input->id.bustype = BUS_HOST; |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 99 | |
| 100 | input->keycode = bdev->keymap; |
| 101 | input->keycodemax = ARRAY_SIZE(bdev->keymap); |
| 102 | input->keycodesize = sizeof(unsigned short); |
| 103 | |
| 104 | input_set_capability(input, EV_MSC, MSC_SCAN); |
| 105 | __set_bit(EV_KEY, input->evbit); |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 106 | for (i = 0; i < ARRAY_SIZE(sgi_map); i++) |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 107 | __set_bit(bdev->keymap[i], input->keybit); |
| 108 | __clear_bit(KEY_RESERVED, input->keybit); |
| 109 | |
Dmitry Torokhov | aede7a1 | 2019-10-29 17:04:18 -0700 | [diff] [blame] | 110 | error = input_setup_polling(input, handle_buttons); |
| 111 | if (error) |
| 112 | return error; |
| 113 | |
| 114 | input_set_poll_interval(input, BUTTONS_POLL_INTERVAL); |
| 115 | |
| 116 | error = input_register_device(input); |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 117 | if (error) |
Dmitry Torokhov | 9e085dd | 2019-10-29 17:04:10 -0700 | [diff] [blame] | 118 | return error; |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 119 | |
| 120 | return 0; |
| 121 | } |
| 122 | |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 123 | static struct platform_driver sgi_buttons_driver = { |
| 124 | .probe = sgi_buttons_probe, |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 125 | .driver = { |
Thomas Bogendoerfer | 48ad88b | 2008-07-19 00:14:26 -0400 | [diff] [blame] | 126 | .name = "sgibtns", |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 127 | }, |
| 128 | }; |
JJ Ding | 840a746 | 2011-11-29 11:08:40 -0800 | [diff] [blame] | 129 | module_platform_driver(sgi_buttons_driver); |
Thomas Bogendoerfer | 3bee2a0 | 2008-07-07 09:07:31 -0400 | [diff] [blame] | 130 | |
Dmitri Vorobiev | 4c2bdcd | 2008-10-25 01:46:57 +0300 | [diff] [blame] | 131 | MODULE_LICENSE("GPL"); |