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 /* 14 */ 15 16 #include <linux/module.h> 17 #include <linux/kernel.h> 18 #include <linux/errno.h> 19 #include <linux/ioport.h> 20 #include <linux/input.h> 21 #include <linux/init.h> 22 #include <linux/interrupt.h> 23 #include <linux/pci.h> 24 #include <linux/delay.h> 25 26 #include <asm/io.h> 27 #include <asm/irq.h> 28 29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 30 MODULE_DESCRIPTION("IBM PC110 touchpad driver"); 31 MODULE_LICENSE("GPL"); 32 33 #define PC110PAD_OFF 0x30 34 #define PC110PAD_ON 0x38 35 36 static int pc110pad_irq = 10; 37 static int pc110pad_io = 0x15e0; 38 39 static struct input_dev *pc110pad_dev; 40 static int pc110pad_data[3]; 41 static int pc110pad_count; 42 43 static irqreturn_t pc110pad_interrupt(int irq, void *ptr) 44 { 45 int value = inb_p(pc110pad_io); 46 int handshake = inb_p(pc110pad_io + 2); 47 48 outb(handshake | 1, pc110pad_io + 2); 49 udelay(2); 50 outb(handshake & ~1, pc110pad_io + 2); 51 udelay(2); 52 inb_p(0x64); 53 54 pc110pad_data[pc110pad_count++] = value; 55 56 if (pc110pad_count < 3) 57 return IRQ_HANDLED; 58 59 input_report_key(pc110pad_dev, BTN_TOUCH, 60 pc110pad_data[0] & 0x01); 61 input_report_abs(pc110pad_dev, ABS_X, 62 pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100)); 63 input_report_abs(pc110pad_dev, ABS_Y, 64 pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80)); 65 input_sync(pc110pad_dev); 66 67 pc110pad_count = 0; 68 return IRQ_HANDLED; 69 } 70 71 static void pc110pad_close(struct input_dev *dev) 72 { 73 outb(PC110PAD_OFF, pc110pad_io + 2); 74 } 75 76 static int pc110pad_open(struct input_dev *dev) 77 { 78 pc110pad_interrupt(0, NULL); 79 pc110pad_interrupt(0, NULL); 80 pc110pad_interrupt(0, NULL); 81 outb(PC110PAD_ON, pc110pad_io + 2); 82 pc110pad_count = 0; 83 84 return 0; 85 } 86 87 /* 88 * We try to avoid enabling the hardware if it's not 89 * there, but we don't know how to test. But we do know 90 * that the PC110 is not a PCI system. So if we find any 91 * PCI devices in the machine, we don't have a PC110. 92 */ 93 static int __init pc110pad_init(void) 94 { 95 int err; 96 97 if (!no_pci_devices()) 98 return -ENODEV; 99 100 if (!request_region(pc110pad_io, 4, "pc110pad")) { 101 printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n", 102 pc110pad_io, pc110pad_io + 4); 103 return -EBUSY; 104 } 105 106 outb(PC110PAD_OFF, pc110pad_io + 2); 107 108 if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) { 109 printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq); 110 err = -EBUSY; 111 goto err_release_region; 112 } 113 114 pc110pad_dev = input_allocate_device(); 115 if (!pc110pad_dev) { 116 printk(KERN_ERR "pc110pad: Not enough memory.\n"); 117 err = -ENOMEM; 118 goto err_free_irq; 119 } 120 121 pc110pad_dev->name = "IBM PC110 TouchPad"; 122 pc110pad_dev->phys = "isa15e0/input0"; 123 pc110pad_dev->id.bustype = BUS_ISA; 124 pc110pad_dev->id.vendor = 0x0003; 125 pc110pad_dev->id.product = 0x0001; 126 pc110pad_dev->id.version = 0x0100; 127 128 pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 129 pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y); 130 pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 131 132 input_abs_set_max(pc110pad_dev, ABS_X, 0x1ff); 133 input_abs_set_max(pc110pad_dev, ABS_Y, 0x0ff); 134 135 pc110pad_dev->open = pc110pad_open; 136 pc110pad_dev->close = pc110pad_close; 137 138 err = input_register_device(pc110pad_dev); 139 if (err) 140 goto err_free_dev; 141 142 return 0; 143 144 err_free_dev: 145 input_free_device(pc110pad_dev); 146 err_free_irq: 147 free_irq(pc110pad_irq, NULL); 148 err_release_region: 149 release_region(pc110pad_io, 4); 150 151 return err; 152 } 153 154 static void __exit pc110pad_exit(void) 155 { 156 outb(PC110PAD_OFF, pc110pad_io + 2); 157 free_irq(pc110pad_irq, NULL); 158 input_unregister_device(pc110pad_dev); 159 release_region(pc110pad_io, 4); 160 } 161 162 module_init(pc110pad_init); 163 module_exit(pc110pad_exit); 164