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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 | // SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2023 Dzmitry Sankouski <dsankouski@gmail.com> */ #include <stdlib.h> #include <common.h> #include <dm.h> #include <fdtdec.h> #include <input.h> #include <keyboard.h> #include <button.h> #include <dm/device-internal.h> #include <log.h> #include <asm/io.h> #include <asm/gpio.h> #include <linux/delay.h> #include <linux/input.h> /** * struct button_kbd_priv - driver private data * * @input: input configuration * @button_size: number of buttons found * @old_state: a pointer to old button states array. Used to determine button state change. */ struct button_kbd_priv { struct input_config *input; u32 button_size; u32 *old_state; }; static int button_kbd_start(struct udevice *dev) { struct button_kbd_priv *priv = dev_get_priv(dev); int i = 0; struct udevice *button_gpio_devp; uclass_foreach_dev_probe(UCLASS_BUTTON, button_gpio_devp) { struct button_uc_plat *uc_plat = dev_get_uclass_plat(button_gpio_devp); /* Ignore the top-level button node */ if (!uc_plat->label) continue; debug("Found button %s #%d - %s, probing...\n", uc_plat->label, i, button_gpio_devp->name); i++; } priv->button_size = i; priv->old_state = calloc(i, sizeof(int)); return 0; } int button_read_keys(struct input_config *input) { struct button_kbd_priv *priv = dev_get_priv(input->dev); struct udevice *button_gpio_devp; struct uclass *uc; int i = 0; u32 code, state, state_changed = 0; uclass_id_foreach_dev(UCLASS_BUTTON, button_gpio_devp, uc) { struct button_uc_plat *uc_plat = dev_get_uclass_plat(button_gpio_devp); /* Ignore the top-level button node */ if (!uc_plat->label) continue; code = button_get_code(button_gpio_devp); if (!code) continue; state = button_get_state(button_gpio_devp); state_changed = state != priv->old_state[i]; if (state_changed) { debug("%s: %d\n", uc_plat->label, code); priv->old_state[i] = state; input_add_keycode(input, code, state); } i++; } return 0; } static const struct keyboard_ops button_kbd_ops = { .start = button_kbd_start, }; static int button_kbd_probe(struct udevice *dev) { struct button_kbd_priv *priv = dev_get_priv(dev); struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev); struct stdio_dev *sdev = &uc_priv->sdev; struct input_config *input = &uc_priv->input; int ret = 0; input_init(input, false); input_add_tables(input, false); /* Register the device. */ priv->input = input; input->dev = dev; input->read_keys = button_read_keys; strcpy(sdev->name, "button-kbd"); ret = input_stdio_register(sdev); if (ret) { debug("%s: input_stdio_register() failed\n", __func__); return ret; } return 0; } U_BOOT_DRIVER(button_kbd) = { .name = "button_kbd", .id = UCLASS_KEYBOARD, .ops = &button_kbd_ops, .priv_auto = sizeof(struct button_kbd_priv), .probe = button_kbd_probe, }; U_BOOT_DRVINFO(button_kbd) = { .name = "button_kbd" }; |