1 /* 2 * $Id: gunze.c,v 1.12 2001/09/25 10:12:07 vojtech Exp $ 3 * 4 * Copyright (c) 2000-2001 Vojtech Pavlik 5 */ 6 7 /* 8 * Gunze AHL-51S touchscreen driver for Linux 9 */ 10 11 /* 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 * Should you need to contact me, the author, you can do so either by 27 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: 28 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic 29 */ 30 31 #include <linux/errno.h> 32 #include <linux/kernel.h> 33 #include <linux/module.h> 34 #include <linux/slab.h> 35 #include <linux/input.h> 36 #include <linux/serio.h> 37 #include <linux/init.h> 38 39 #define DRIVER_DESC "Gunze AHL-51S touchscreen driver" 40 41 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 42 MODULE_DESCRIPTION(DRIVER_DESC); 43 MODULE_LICENSE("GPL"); 44 45 /* 46 * Definitions & global arrays. 47 */ 48 49 #define GUNZE_MAX_LENGTH 10 50 51 static char *gunze_name = "Gunze AHL-51S TouchScreen"; 52 53 /* 54 * Per-touchscreen data. 55 */ 56 57 struct gunze { 58 struct input_dev dev; 59 struct serio *serio; 60 int idx; 61 unsigned char data[GUNZE_MAX_LENGTH]; 62 char phys[32]; 63 }; 64 65 static void gunze_process_packet(struct gunze* gunze, struct pt_regs *regs) 66 { 67 struct input_dev *dev = &gunze->dev; 68 69 if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' || 70 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) { 71 gunze->data[10] = 0; 72 printk(KERN_WARNING "gunze.c: bad packet: >%s<\n", gunze->data); 73 return; 74 } 75 76 input_regs(dev, regs); 77 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10)); 78 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10)); 79 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T'); 80 input_sync(dev); 81 } 82 83 static irqreturn_t gunze_interrupt(struct serio *serio, 84 unsigned char data, unsigned int flags, struct pt_regs *regs) 85 { 86 struct gunze* gunze = serio_get_drvdata(serio); 87 88 if (data == '\r') { 89 gunze_process_packet(gunze, regs); 90 gunze->idx = 0; 91 } else { 92 if (gunze->idx < GUNZE_MAX_LENGTH) 93 gunze->data[gunze->idx++] = data; 94 } 95 return IRQ_HANDLED; 96 } 97 98 /* 99 * gunze_disconnect() is the opposite of gunze_connect() 100 */ 101 102 static void gunze_disconnect(struct serio *serio) 103 { 104 struct gunze* gunze = serio_get_drvdata(serio); 105 106 input_unregister_device(&gunze->dev); 107 serio_close(serio); 108 serio_set_drvdata(serio, NULL); 109 kfree(gunze); 110 } 111 112 /* 113 * gunze_connect() is the routine that is called when someone adds a 114 * new serio device that supports Gunze protocol and registers it as 115 * an input device. 116 */ 117 118 static int gunze_connect(struct serio *serio, struct serio_driver *drv) 119 { 120 struct gunze *gunze; 121 int err; 122 123 if (!(gunze = kmalloc(sizeof(struct gunze), GFP_KERNEL))) 124 return -ENOMEM; 125 126 memset(gunze, 0, sizeof(struct gunze)); 127 128 init_input_dev(&gunze->dev); 129 gunze->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); 130 gunze->dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); 131 input_set_abs_params(&gunze->dev, ABS_X, 24, 1000, 0, 0); 132 input_set_abs_params(&gunze->dev, ABS_Y, 24, 1000, 0, 0); 133 134 gunze->serio = serio; 135 136 sprintf(gunze->phys, "%s/input0", serio->phys); 137 138 gunze->dev.private = gunze; 139 gunze->dev.name = gunze_name; 140 gunze->dev.phys = gunze->phys; 141 gunze->dev.id.bustype = BUS_RS232; 142 gunze->dev.id.vendor = SERIO_GUNZE; 143 gunze->dev.id.product = 0x0051; 144 gunze->dev.id.version = 0x0100; 145 146 serio_set_drvdata(serio, gunze); 147 148 err = serio_open(serio, drv); 149 if (err) { 150 serio_set_drvdata(serio, NULL); 151 kfree(gunze); 152 return err; 153 } 154 155 input_register_device(&gunze->dev); 156 157 printk(KERN_INFO "input: %s on %s\n", gunze_name, serio->phys); 158 159 return 0; 160 } 161 162 /* 163 * The serio driver structure. 164 */ 165 166 static 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 }; 175 176 MODULE_DEVICE_TABLE(serio, gunze_serio_ids); 177 178 static 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 */ 192 193 static int __init gunze_init(void) 194 { 195 serio_register_driver(&gunze_drv); 196 return 0; 197 } 198 199 static void __exit gunze_exit(void) 200 { 201 serio_unregister_driver(&gunze_drv); 202 } 203 204 module_init(gunze_init); 205 module_exit(gunze_exit); 206