1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2000-2001 Vojtech Pavlik 4 * 5 * Based on the work of: 6 * Alan Cox Robin O'Leary 7 */ 8 9 /* 10 * IBM PC110 touchpad driver for Linux 11 */ 12 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/errno.h> 16 #include <linux/ioport.h> 17 #include <linux/input.h> 18 #include <linux/init.h> 19 #include <linux/interrupt.h> 20 #include <linux/pci.h> 21 #include <linux/delay.h> 22 23 #include <asm/io.h> 24 #include <asm/irq.h> 25 26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 27 MODULE_DESCRIPTION("IBM PC110 touchpad driver"); 28 MODULE_LICENSE("GPL"); 29 30 #define PC110PAD_OFF 0x30 31 #define PC110PAD_ON 0x38 32 33 static int pc110pad_irq = 10; 34 static int pc110pad_io = 0x15e0; 35 36 static struct input_dev *pc110pad_dev; 37 static int pc110pad_data[3]; 38 static int pc110pad_count; 39 40 static irqreturn_t pc110pad_interrupt(int irq, void *ptr) 41 { 42 int value = inb_p(pc110pad_io); 43 int handshake = inb_p(pc110pad_io + 2); 44 45 outb(handshake | 1, pc110pad_io + 2); 46 udelay(2); 47 outb(handshake & ~1, pc110pad_io + 2); 48 udelay(2); 49 inb_p(0x64); 50 51 pc110pad_data[pc110pad_count++] = value; 52 53 if (pc110pad_count < 3) 54 return IRQ_HANDLED; 55 56 input_report_key(pc110pad_dev, BTN_TOUCH, 57 pc110pad_data[0] & 0x01); 58 input_report_abs(pc110pad_dev, ABS_X, 59 pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100)); 60 input_report_abs(pc110pad_dev, ABS_Y, 61 pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80)); 62 input_sync(pc110pad_dev); 63 64 pc110pad_count = 0; 65 return IRQ_HANDLED; 66 } 67 68 static void pc110pad_close(struct input_dev *dev) 69 { 70 outb(PC110PAD_OFF, pc110pad_io + 2); 71 } 72 73 static int pc110pad_open(struct input_dev *dev) 74 { 75 pc110pad_interrupt(0, NULL); 76 pc110pad_interrupt(0, NULL); 77 pc110pad_interrupt(0, NULL); 78 outb(PC110PAD_ON, pc110pad_io + 2); 79 pc110pad_count = 0; 80 81 return 0; 82 } 83 84 /* 85 * We try to avoid enabling the hardware if it's not 86 * there, but we don't know how to test. But we do know 87 * that the PC110 is not a PCI system. So if we find any 88 * PCI devices in the machine, we don't have a PC110. 89 */ 90 static int __init pc110pad_init(void) 91 { 92 int err; 93 94 if (!no_pci_devices()) 95 return -ENODEV; 96 97 if (!request_region(pc110pad_io, 4, "pc110pad")) { 98 printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n", 99 pc110pad_io, pc110pad_io + 4); 100 return -EBUSY; 101 } 102 103 outb(PC110PAD_OFF, pc110pad_io + 2); 104 105 if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) { 106 printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq); 107 err = -EBUSY; 108 goto err_release_region; 109 } 110 111 pc110pad_dev = input_allocate_device(); 112 if (!pc110pad_dev) { 113 printk(KERN_ERR "pc110pad: Not enough memory.\n"); 114 err = -ENOMEM; 115 goto err_free_irq; 116 } 117 118 pc110pad_dev->name = "IBM PC110 TouchPad"; 119 pc110pad_dev->phys = "isa15e0/input0"; 120 pc110pad_dev->id.bustype = BUS_ISA; 121 pc110pad_dev->id.vendor = 0x0003; 122 pc110pad_dev->id.product = 0x0001; 123 pc110pad_dev->id.version = 0x0100; 124 125 pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 126 pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y); 127 pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 128 129 input_abs_set_max(pc110pad_dev, ABS_X, 0x1ff); 130 input_abs_set_max(pc110pad_dev, ABS_Y, 0x0ff); 131 132 pc110pad_dev->open = pc110pad_open; 133 pc110pad_dev->close = pc110pad_close; 134 135 err = input_register_device(pc110pad_dev); 136 if (err) 137 goto err_free_dev; 138 139 return 0; 140 141 err_free_dev: 142 input_free_device(pc110pad_dev); 143 err_free_irq: 144 free_irq(pc110pad_irq, NULL); 145 err_release_region: 146 release_region(pc110pad_io, 4); 147 148 return err; 149 } 150 151 static void __exit pc110pad_exit(void) 152 { 153 outb(PC110PAD_OFF, pc110pad_io + 2); 154 free_irq(pc110pad_irq, NULL); 155 input_unregister_device(pc110pad_dev); 156 release_region(pc110pad_io, 4); 157 } 158 159 module_init(pc110pad_init); 160 module_exit(pc110pad_exit); 161