1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 1999-2001 Vojtech Pavlik 4 * 5 * Based on the work of: 6 * James Banks Matthew Dillon 7 * David Giller Nathan Laredo 8 * Linus Torvalds Johan Myreen 9 * Cliff Matthews Philip Blundell 10 * Russell King 11 */ 12 13 /* 14 * Logitech Bus Mouse Driver for Linux 15 */ 16 17 #include <linux/module.h> 18 #include <linux/delay.h> 19 #include <linux/ioport.h> 20 #include <linux/init.h> 21 #include <linux/input.h> 22 #include <linux/interrupt.h> 23 24 #include <asm/io.h> 25 #include <asm/irq.h> 26 27 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 28 MODULE_DESCRIPTION("Logitech busmouse driver"); 29 MODULE_LICENSE("GPL"); 30 31 #define LOGIBM_BASE 0x23c 32 #define LOGIBM_EXTENT 4 33 34 #define LOGIBM_DATA_PORT LOGIBM_BASE + 0 35 #define LOGIBM_SIGNATURE_PORT LOGIBM_BASE + 1 36 #define LOGIBM_CONTROL_PORT LOGIBM_BASE + 2 37 #define LOGIBM_CONFIG_PORT LOGIBM_BASE + 3 38 39 #define LOGIBM_ENABLE_IRQ 0x00 40 #define LOGIBM_DISABLE_IRQ 0x10 41 #define LOGIBM_READ_X_LOW 0x80 42 #define LOGIBM_READ_X_HIGH 0xa0 43 #define LOGIBM_READ_Y_LOW 0xc0 44 #define LOGIBM_READ_Y_HIGH 0xe0 45 46 #define LOGIBM_DEFAULT_MODE 0x90 47 #define LOGIBM_CONFIG_BYTE 0x91 48 #define LOGIBM_SIGNATURE_BYTE 0xa5 49 50 #define LOGIBM_IRQ 5 51 52 static int logibm_irq = LOGIBM_IRQ; 53 module_param_hw_named(irq, logibm_irq, uint, irq, 0); 54 MODULE_PARM_DESC(irq, "IRQ number (5=default)"); 55 56 static struct input_dev *logibm_dev; 57 58 static irqreturn_t logibm_interrupt(int irq, void *dev_id) 59 { 60 char dx, dy; 61 unsigned char buttons; 62 63 outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT); 64 dx = (inb(LOGIBM_DATA_PORT) & 0xf); 65 outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT); 66 dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4; 67 outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT); 68 dy = (inb(LOGIBM_DATA_PORT) & 0xf); 69 outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT); 70 buttons = inb(LOGIBM_DATA_PORT); 71 dy |= (buttons & 0xf) << 4; 72 buttons = ~buttons >> 5; 73 74 input_report_rel(logibm_dev, REL_X, dx); 75 input_report_rel(logibm_dev, REL_Y, dy); 76 input_report_key(logibm_dev, BTN_RIGHT, buttons & 1); 77 input_report_key(logibm_dev, BTN_MIDDLE, buttons & 2); 78 input_report_key(logibm_dev, BTN_LEFT, buttons & 4); 79 input_sync(logibm_dev); 80 81 outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT); 82 return IRQ_HANDLED; 83 } 84 85 static int logibm_open(struct input_dev *dev) 86 { 87 if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) { 88 printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq); 89 return -EBUSY; 90 } 91 outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT); 92 return 0; 93 } 94 95 static void logibm_close(struct input_dev *dev) 96 { 97 outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT); 98 free_irq(logibm_irq, NULL); 99 } 100 101 static int __init logibm_init(void) 102 { 103 int err; 104 105 if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) { 106 printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE); 107 return -EBUSY; 108 } 109 110 outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT); 111 outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT); 112 udelay(100); 113 114 if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) { 115 printk(KERN_INFO "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE); 116 err = -ENODEV; 117 goto err_release_region; 118 } 119 120 outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT); 121 outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT); 122 123 logibm_dev = input_allocate_device(); 124 if (!logibm_dev) { 125 printk(KERN_ERR "logibm.c: Not enough memory for input device\n"); 126 err = -ENOMEM; 127 goto err_release_region; 128 } 129 130 logibm_dev->name = "Logitech bus mouse"; 131 logibm_dev->phys = "isa023c/input0"; 132 logibm_dev->id.bustype = BUS_ISA; 133 logibm_dev->id.vendor = 0x0003; 134 logibm_dev->id.product = 0x0001; 135 logibm_dev->id.version = 0x0100; 136 137 logibm_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); 138 logibm_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) | 139 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT); 140 logibm_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); 141 142 logibm_dev->open = logibm_open; 143 logibm_dev->close = logibm_close; 144 145 err = input_register_device(logibm_dev); 146 if (err) 147 goto err_free_dev; 148 149 return 0; 150 151 err_free_dev: 152 input_free_device(logibm_dev); 153 err_release_region: 154 release_region(LOGIBM_BASE, LOGIBM_EXTENT); 155 156 return err; 157 } 158 159 static void __exit logibm_exit(void) 160 { 161 input_unregister_device(logibm_dev); 162 release_region(LOGIBM_BASE, LOGIBM_EXTENT); 163 } 164 165 module_init(logibm_init); 166 module_exit(logibm_exit); 167