root/arch/x86/platform/intel-mid/device_libs/platform_gpio_keys.c

DEFINITIONS

1. pb_keys_init

   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  */
  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);