arch/arm/mach-tegra/board-stingray-keypad.c

   1 /*
   2  * arch/arm/mach-tegra/board-stingray-keypad.c
   3  *
   4  * Copyright (C) 2010 Google, Inc.
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <linux/platform_device.h>
  18 #include <linux/input.h>
  19 #include <linux/keyreset.h>
  20 #include <linux/gpio_event.h>
  21 #include <linux/gpio.h>
  22 #include <asm/mach-types.h>
  23
  24 #include "board-stingray.h"
  25 #include "gpio-names.h"
  26
  27 static unsigned int stingray_row_gpios[] = {
  28         TEGRA_GPIO_PR0,
  29         TEGRA_GPIO_PR1
  30 };
  31 static unsigned int stingray_col_gpios[] = {
  32         TEGRA_GPIO_PQ0
  33 };
  34
  35 #define KEYMAP_INDEX(col, row) ((col)*ARRAY_SIZE(stingray_row_gpios) + (row))
  36
  37 static const unsigned short stingray_p3_keymap[ARRAY_SIZE(stingray_col_gpios) *
  38                                              ARRAY_SIZE(stingray_row_gpios)] = {
  39         [KEYMAP_INDEX(0, 0)] = KEY_VOLUMEUP,
  40         [KEYMAP_INDEX(0, 1)] = KEY_VOLUMEDOWN
  41 };
  42
  43 static struct gpio_event_matrix_info stingray_keypad_matrix_info = {
  44         .info.func = gpio_event_matrix_func,
  45         .keymap = stingray_p3_keymap,
  46         .output_gpios = stingray_col_gpios,
  47         .input_gpios = stingray_row_gpios,
  48         .noutputs = ARRAY_SIZE(stingray_col_gpios),
  49         .ninputs = ARRAY_SIZE(stingray_row_gpios),
  50         .settle_time.tv.nsec = 40 * NSEC_PER_USEC,
  51         .poll_time.tv.nsec = 20 * NSEC_PER_MSEC,
  52         .flags = GPIOKPF_LEVEL_TRIGGERED_IRQ | GPIOKPF_REMOVE_PHANTOM_KEYS |
  53                  GPIOKPF_PRINT_UNMAPPED_KEYS /*| GPIOKPF_PRINT_MAPPED_KEYS*/
  54 };
  55
  56 static struct gpio_event_direct_entry stingray_keypad_switch_map[] = {
  57 };
  58
  59 static struct gpio_event_input_info stingray_keypad_switch_info = {
  60         .info.func = gpio_event_input_func,
  61         .flags = 0,
  62         .type = EV_SW,
  63         .keymap = stingray_keypad_switch_map,
  64         .keymap_size = ARRAY_SIZE(stingray_keypad_switch_map)
  65 };
  66
  67 static struct gpio_event_info *stingray_keypad_info[] = {
  68         &stingray_keypad_matrix_info.info,
  69         &stingray_keypad_switch_info.info,
  70 };
  71
  72 static struct gpio_event_platform_data stingray_keypad_data = {
  73         .name = "stingray-keypad",
  74         .info = stingray_keypad_info,
  75         .info_count = ARRAY_SIZE(stingray_keypad_info)
  76 };
  77
  78 static struct platform_device stingray_keypad_device = {
  79         .name = GPIO_EVENT_DEV_NAME,
  80         .id = 0,
  81         .dev            = {
  82                 .platform_data  = &stingray_keypad_data,
  83         },
  84 };
  85
  86 int stingray_log_reset(void)
  87 {
  88         pr_warn("Hard reset buttons pushed\n");
  89         return 0;
  90 }
  91
  92 static struct keyreset_platform_data stingray_reset_keys_pdata = {
  93         .reset_fn = stingray_log_reset,
  94         .keys_down = {
  95                 KEY_END,
  96                 KEY_VOLUMEUP,
  97                 0
  98         },
  99 };
 100
 101 struct platform_device stingray_keyreset_device = {
 102         .name   = KEYRESET_NAME,
 103         .dev    = {
 104                 .platform_data = &stingray_reset_keys_pdata,
 105         },
 106 };
 107
 108
 109 int __init stingray_keypad_init(void)
 110 {
 111         tegra_gpio_enable(TEGRA_GPIO_PR0);
 112         tegra_gpio_enable(TEGRA_GPIO_PR1);
 113         tegra_gpio_enable(TEGRA_GPIO_PQ0);
 114         platform_device_register(&stingray_keyreset_device);
 115         return platform_device_register(&stingray_keypad_device);
 116 }