1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Stowaway keyboard driver for Linux 4 */ 5 6 /* 7 * Copyright (c) 2006 Marek Vasut 8 * 9 * Based on Newton keyboard driver for Linux 10 * by Justin Cormack 11 */ 12 13 #include <linux/slab.h> 14 #include <linux/module.h> 15 #include <linux/input.h> 16 #include <linux/serio.h> 17 18 #define DRIVER_DESC "Stowaway keyboard driver" 19 20 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); 21 MODULE_DESCRIPTION(DRIVER_DESC); 22 MODULE_LICENSE("GPL"); 23 24 #define SKBD_KEY_MASK 0x7f 25 #define SKBD_RELEASE 0x80 26 27 static unsigned char skbd_keycode[128] = { 28 KEY_1, KEY_2, KEY_3, KEY_Z, KEY_4, KEY_5, KEY_6, KEY_7, 29 0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_GRAVE, 30 KEY_X, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_SPACE, 31 KEY_CAPSLOCK, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0, 32 0, 0, 0, KEY_LEFTALT, 0, 0, 0, 0, 33 0, 0, 0, 0, KEY_C, KEY_V, KEY_B, KEY_N, 34 KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, KEY_HOME, KEY_8, KEY_9, KEY_0, KEY_ESC, 35 KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_END, KEY_U, KEY_I, KEY_O, KEY_P, 36 KEY_APOSTROPHE, KEY_ENTER, KEY_PAGEUP,0, KEY_J, KEY_K, KEY_L, KEY_SEMICOLON, 37 KEY_SLASH, KEY_UP, KEY_PAGEDOWN, 0,KEY_M, KEY_COMMA, KEY_DOT, KEY_INSERT, 38 KEY_DELETE, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 39 KEY_LEFTSHIFT, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 40 0, 0, 0, 0, 0, 0, 0, 0, 41 0, 0, 0, 0, 0, 0, 0, 0, 42 0, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7, 43 KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, 0, 0, 0 44 }; 45 46 struct skbd { 47 unsigned char keycode[128]; 48 struct input_dev *dev; 49 struct serio *serio; 50 char phys[32]; 51 }; 52 53 static irqreturn_t skbd_interrupt(struct serio *serio, unsigned char data, 54 unsigned int flags) 55 { 56 struct skbd *skbd = serio_get_drvdata(serio); 57 struct input_dev *dev = skbd->dev; 58 59 if (skbd->keycode[data & SKBD_KEY_MASK]) { 60 input_report_key(dev, skbd->keycode[data & SKBD_KEY_MASK], 61 !(data & SKBD_RELEASE)); 62 input_sync(dev); 63 } 64 65 return IRQ_HANDLED; 66 } 67 68 static int skbd_connect(struct serio *serio, struct serio_driver *drv) 69 { 70 struct skbd *skbd; 71 struct input_dev *input_dev; 72 int err = -ENOMEM; 73 int i; 74 75 skbd = kzalloc(sizeof(struct skbd), GFP_KERNEL); 76 input_dev = input_allocate_device(); 77 if (!skbd || !input_dev) 78 goto fail1; 79 80 skbd->serio = serio; 81 skbd->dev = input_dev; 82 snprintf(skbd->phys, sizeof(skbd->phys), "%s/input0", serio->phys); 83 memcpy(skbd->keycode, skbd_keycode, sizeof(skbd->keycode)); 84 85 input_dev->name = "Stowaway Keyboard"; 86 input_dev->phys = skbd->phys; 87 input_dev->id.bustype = BUS_RS232; 88 input_dev->id.vendor = SERIO_STOWAWAY; 89 input_dev->id.product = 0x0001; 90 input_dev->id.version = 0x0100; 91 input_dev->dev.parent = &serio->dev; 92 93 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); 94 input_dev->keycode = skbd->keycode; 95 input_dev->keycodesize = sizeof(unsigned char); 96 input_dev->keycodemax = ARRAY_SIZE(skbd_keycode); 97 for (i = 0; i < ARRAY_SIZE(skbd_keycode); i++) 98 set_bit(skbd_keycode[i], input_dev->keybit); 99 clear_bit(0, input_dev->keybit); 100 101 serio_set_drvdata(serio, skbd); 102 103 err = serio_open(serio, drv); 104 if (err) 105 goto fail2; 106 107 err = input_register_device(skbd->dev); 108 if (err) 109 goto fail3; 110 111 return 0; 112 113 fail3: serio_close(serio); 114 fail2: serio_set_drvdata(serio, NULL); 115 fail1: input_free_device(input_dev); 116 kfree(skbd); 117 return err; 118 } 119 120 static void skbd_disconnect(struct serio *serio) 121 { 122 struct skbd *skbd = serio_get_drvdata(serio); 123 124 serio_close(serio); 125 serio_set_drvdata(serio, NULL); 126 input_unregister_device(skbd->dev); 127 kfree(skbd); 128 } 129 130 static const struct serio_device_id skbd_serio_ids[] = { 131 { 132 .type = SERIO_RS232, 133 .proto = SERIO_STOWAWAY, 134 .id = SERIO_ANY, 135 .extra = SERIO_ANY, 136 }, 137 { 0 } 138 }; 139 140 MODULE_DEVICE_TABLE(serio, skbd_serio_ids); 141 142 static struct serio_driver skbd_drv = { 143 .driver = { 144 .name = "stowaway", 145 }, 146 .description = DRIVER_DESC, 147 .id_table = skbd_serio_ids, 148 .interrupt = skbd_interrupt, 149 .connect = skbd_connect, 150 .disconnect = skbd_disconnect, 151 }; 152 153 module_serio_driver(skbd_drv); 154