1/* 2 * Copyright (c) 2000-2001 Vojtech Pavlik 3 */ 4 5/* 6 * Gunze AHL-51S touchscreen driver for Linux 7 */ 8 9/* 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 * Should you need to contact me, the author, you can do so either by 25 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: 26 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic 27 */ 28 29#include <linux/errno.h> 30#include <linux/kernel.h> 31#include <linux/module.h> 32#include <linux/slab.h> 33#include <linux/input.h> 34#include <linux/serio.h> 35#include <linux/init.h> 36 37#define DRIVER_DESC "Gunze AHL-51S touchscreen driver" 38 39MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 40MODULE_DESCRIPTION(DRIVER_DESC); 41MODULE_LICENSE("GPL"); 42 43/* 44 * Definitions & global arrays. 45 */ 46 47#define GUNZE_MAX_LENGTH 10 48 49/* 50 * Per-touchscreen data. 51 */ 52 53struct gunze { 54 struct input_dev *dev; 55 struct serio *serio; 56 int idx; 57 unsigned char data[GUNZE_MAX_LENGTH]; 58 char phys[32]; 59}; 60 61static void gunze_process_packet(struct gunze* gunze) 62{ 63 struct input_dev *dev = gunze->dev; 64 65 if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' || 66 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) { 67 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data); 68 return; 69 } 70 71 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10)); 72 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10)); 73 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T'); 74 input_sync(dev); 75} 76 77static irqreturn_t gunze_interrupt(struct serio *serio, 78 unsigned char data, unsigned int flags) 79{ 80 struct gunze* gunze = serio_get_drvdata(serio); 81 82 if (data == '\r') { 83 gunze_process_packet(gunze); 84 gunze->idx = 0; 85 } else { 86 if (gunze->idx < GUNZE_MAX_LENGTH) 87 gunze->data[gunze->idx++] = data; 88 } 89 return IRQ_HANDLED; 90} 91 92/* 93 * gunze_disconnect() is the opposite of gunze_connect() 94 */ 95 96static void gunze_disconnect(struct serio *serio) 97{ 98 struct gunze *gunze = serio_get_drvdata(serio); 99 100 input_get_device(gunze->dev); 101 input_unregister_device(gunze->dev); 102 serio_close(serio); 103 serio_set_drvdata(serio, NULL); 104 input_put_device(gunze->dev); 105 kfree(gunze); 106} 107 108/* 109 * gunze_connect() is the routine that is called when someone adds a 110 * new serio device that supports Gunze protocol and registers it as 111 * an input device. 112 */ 113 114static int gunze_connect(struct serio *serio, struct serio_driver *drv) 115{ 116 struct gunze *gunze; 117 struct input_dev *input_dev; 118 int err; 119 120 gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL); 121 input_dev = input_allocate_device(); 122 if (!gunze || !input_dev) { 123 err = -ENOMEM; 124 goto fail1; 125 } 126 127 gunze->serio = serio; 128 gunze->dev = input_dev; 129 snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys); 130 131 input_dev->name = "Gunze AHL-51S TouchScreen"; 132 input_dev->phys = gunze->phys; 133 input_dev->id.bustype = BUS_RS232; 134 input_dev->id.vendor = SERIO_GUNZE; 135 input_dev->id.product = 0x0051; 136 input_dev->id.version = 0x0100; 137 input_dev->dev.parent = &serio->dev; 138 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 139 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 140 input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0); 141 input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0); 142 143 serio_set_drvdata(serio, gunze); 144 145 err = serio_open(serio, drv); 146 if (err) 147 goto fail2; 148 149 err = input_register_device(gunze->dev); 150 if (err) 151 goto fail3; 152 153 return 0; 154 155 fail3: serio_close(serio); 156 fail2: serio_set_drvdata(serio, NULL); 157 fail1: input_free_device(input_dev); 158 kfree(gunze); 159 return err; 160} 161 162/* 163 * The serio driver structure. 164 */ 165 166static struct serio_device_id gunze_serio_ids[] = { 167 { 168 .type = SERIO_RS232, 169 .proto = SERIO_GUNZE, 170 .id = SERIO_ANY, 171 .extra = SERIO_ANY, 172 }, 173 { 0 } 174}; 175 176MODULE_DEVICE_TABLE(serio, gunze_serio_ids); 177 178static struct serio_driver gunze_drv = { 179 .driver = { 180 .name = "gunze", 181 }, 182 .description = DRIVER_DESC, 183 .id_table = gunze_serio_ids, 184 .interrupt = gunze_interrupt, 185 .connect = gunze_connect, 186 .disconnect = gunze_disconnect, 187}; 188 189/* 190 * The functions for inserting/removing us as a module. 191 */ 192 193static int __init gunze_init(void) 194{ 195 return serio_register_driver(&gunze_drv); 196} 197 198static void __exit gunze_exit(void) 199{ 200 serio_unregister_driver(&gunze_drv); 201} 202 203module_init(gunze_init); 204module_exit(gunze_exit); 205