1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 1999-2001 Vojtech Pavlik 4 */ 5 6 /* 7 * XT keyboard driver for Linux 8 */ 9 10 /* 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 "XT keyboard driver" 19 20 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 21 MODULE_DESCRIPTION(DRIVER_DESC); 22 MODULE_LICENSE("GPL"); 23 24 #define XTKBD_EMUL0 0xe0 25 #define XTKBD_EMUL1 0xe1 26 #define XTKBD_KEY 0x7f 27 #define XTKBD_RELEASE 0x80 28 29 static unsigned char xtkbd_keycode[256] = { 30 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 33 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 34 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 35 80, 81, 82, 83, 0, 0, 0, 87, 88, 0, 0, 0, 0, 0, 0, 0, 36 0, 0, 0, 0, 0, 87, 88, 0, 0, 0, 0,110,111,103,108,105, 37 106 38 }; 39 40 struct xtkbd { 41 unsigned char keycode[256]; 42 struct input_dev *dev; 43 struct serio *serio; 44 char phys[32]; 45 }; 46 47 static irqreturn_t xtkbd_interrupt(struct serio *serio, 48 unsigned char data, unsigned int flags) 49 { 50 struct xtkbd *xtkbd = serio_get_drvdata(serio); 51 52 switch (data) { 53 case XTKBD_EMUL0: 54 case XTKBD_EMUL1: 55 break; 56 default: 57 58 if (xtkbd->keycode[data & XTKBD_KEY]) { 59 input_report_key(xtkbd->dev, xtkbd->keycode[data & XTKBD_KEY], !(data & XTKBD_RELEASE)); 60 input_sync(xtkbd->dev); 61 } else { 62 printk(KERN_WARNING "xtkbd.c: Unknown key (scancode %#x) %s.\n", 63 data & XTKBD_KEY, data & XTKBD_RELEASE ? "released" : "pressed"); 64 } 65 } 66 return IRQ_HANDLED; 67 } 68 69 static int xtkbd_connect(struct serio *serio, struct serio_driver *drv) 70 { 71 struct xtkbd *xtkbd; 72 struct input_dev *input_dev; 73 int err = -ENOMEM; 74 int i; 75 76 xtkbd = kmalloc(sizeof(struct xtkbd), GFP_KERNEL); 77 input_dev = input_allocate_device(); 78 if (!xtkbd || !input_dev) 79 goto fail1; 80 81 xtkbd->serio = serio; 82 xtkbd->dev = input_dev; 83 snprintf(xtkbd->phys, sizeof(xtkbd->phys), "%s/input0", serio->phys); 84 memcpy(xtkbd->keycode, xtkbd_keycode, sizeof(xtkbd->keycode)); 85 86 input_dev->name = "XT Keyboard"; 87 input_dev->phys = xtkbd->phys; 88 input_dev->id.bustype = BUS_XTKBD; 89 input_dev->id.vendor = 0x0001; 90 input_dev->id.product = 0x0001; 91 input_dev->id.version = 0x0100; 92 input_dev->dev.parent = &serio->dev; 93 94 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); 95 input_dev->keycode = xtkbd->keycode; 96 input_dev->keycodesize = sizeof(unsigned char); 97 input_dev->keycodemax = ARRAY_SIZE(xtkbd_keycode); 98 99 for (i = 0; i < 255; i++) 100 set_bit(xtkbd->keycode[i], input_dev->keybit); 101 clear_bit(0, input_dev->keybit); 102 103 serio_set_drvdata(serio, xtkbd); 104 105 err = serio_open(serio, drv); 106 if (err) 107 goto fail2; 108 109 err = input_register_device(xtkbd->dev); 110 if (err) 111 goto fail3; 112 113 return 0; 114 115 fail3: serio_close(serio); 116 fail2: serio_set_drvdata(serio, NULL); 117 fail1: input_free_device(input_dev); 118 kfree(xtkbd); 119 return err; 120 } 121 122 static void xtkbd_disconnect(struct serio *serio) 123 { 124 struct xtkbd *xtkbd = serio_get_drvdata(serio); 125 126 serio_close(serio); 127 serio_set_drvdata(serio, NULL); 128 input_unregister_device(xtkbd->dev); 129 kfree(xtkbd); 130 } 131 132 static const struct serio_device_id xtkbd_serio_ids[] = { 133 { 134 .type = SERIO_XT, 135 .proto = SERIO_ANY, 136 .id = SERIO_ANY, 137 .extra = SERIO_ANY, 138 }, 139 { 0 } 140 }; 141 142 MODULE_DEVICE_TABLE(serio, xtkbd_serio_ids); 143 144 static struct serio_driver xtkbd_drv = { 145 .driver = { 146 .name = "xtkbd", 147 }, 148 .description = DRIVER_DESC, 149 .id_table = xtkbd_serio_ids, 150 .interrupt = xtkbd_interrupt, 151 .connect = xtkbd_connect, 152 .disconnect = xtkbd_disconnect, 153 }; 154 155 module_serio_driver(xtkbd_drv); 156