1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * platform_gpio_keys.c: gpio_keys platform data initialization file
4 *
5 * (C) Copyright 2013 Intel Corporation
6 * Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
7 */
8
9 #include <linux/input.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/gpio.h>
13 #include <linux/gpio_keys.h>
14 #include <linux/platform_device.h>
15 #include <asm/intel-mid.h>
16
17 #define DEVICE_NAME "gpio-keys"
18
19 /*
20 * we will search these buttons in SFI GPIO table (by name)
21 * and register them dynamically. Please add all possible
22 * buttons here, we will shrink them if no GPIO found.
23 */
24 static struct gpio_keys_button gpio_button[] = {
25 {KEY_POWER, -1, 1, "power_btn", EV_KEY, 0, 3000},
26 {KEY_PROG1, -1, 1, "prog_btn1", EV_KEY, 0, 20},
27 {KEY_PROG2, -1, 1, "prog_btn2", EV_KEY, 0, 20},
28 {SW_LID, -1, 1, "lid_switch", EV_SW, 0, 20},
29 {KEY_VOLUMEUP, -1, 1, "vol_up", EV_KEY, 0, 20},
30 {KEY_VOLUMEDOWN, -1, 1, "vol_down", EV_KEY, 0, 20},
31 {KEY_MUTE, -1, 1, "mute_enable", EV_KEY, 0, 20},
32 {KEY_VOLUMEUP, -1, 1, "volume_up", EV_KEY, 0, 20},
33 {KEY_VOLUMEDOWN, -1, 1, "volume_down", EV_KEY, 0, 20},
34 {KEY_CAMERA, -1, 1, "camera_full", EV_KEY, 0, 20},
35 {KEY_CAMERA_FOCUS, -1, 1, "camera_half", EV_KEY, 0, 20},
36 {SW_KEYPAD_SLIDE, -1, 1, "MagSw1", EV_SW, 0, 20},
37 {SW_KEYPAD_SLIDE, -1, 1, "MagSw2", EV_SW, 0, 20},
38 };
39
40 static struct gpio_keys_platform_data gpio_keys = {
41 .buttons = gpio_button,
42 .rep = 1,
43 .nbuttons = -1, /* will fill it after search */
44 };
45
46 static struct platform_device pb_device = {
47 .name = DEVICE_NAME,
48 .id = -1,
49 .dev = {
50 .platform_data = &gpio_keys,
51 },
52 };
53
54 /*
55 * Shrink the non-existent buttons, register the gpio button
56 * device if there is some
57 */
pb_keys_init(void)58 static int __init pb_keys_init(void)
59 {
60 struct gpio_keys_button *gb = gpio_button;
61 int i, good = 0;
62
63 for (i = 0; i < ARRAY_SIZE(gpio_button); i++) {
64 gb[i].gpio = get_gpio_by_name(gb[i].desc);
65 pr_debug("info[%2d]: name = %s, gpio = %d\n", i, gb[i].desc,
66 gb[i].gpio);
67 if (gb[i].gpio < 0)
68 continue;
69
70 if (i != good)
71 gb[good] = gb[i];
72 good++;
73 }
74
75 if (good) {
76 gpio_keys.nbuttons = good;
77 return platform_device_register(&pb_device);
78 }
79 return 0;
80 }
81 late_initcall(pb_keys_init);
82