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 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data); 72 return; 73 } 74 75 input_regs(dev, regs); 76 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10)); 77 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10)); 78 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T'); 79 input_sync(dev); 80 } 81 82 static irqreturn_t gunze_interrupt(struct serio *serio, 83 unsigned char data, unsigned int flags, struct pt_regs *regs) 84 { 85 struct gunze* gunze = serio_get_drvdata(serio); 86 87 if (data == '\r') { 88 gunze_process_packet(gunze, regs); 89 gunze->idx = 0; 90 } else { 91 if (gunze->idx < GUNZE_MAX_LENGTH) 92 gunze->data[gunze->idx++] = data; 93 } 94 return IRQ_HANDLED; 95 } 96 97 /* 98 * gunze_disconnect() is the opposite of gunze_connect() 99 */ 100 101 static void gunze_disconnect(struct serio *serio) 102 { 103 struct gunze* gunze = serio_get_drvdata(serio); 104 105 input_unregister_device(&gunze->dev); 106 serio_close(serio); 107 serio_set_drvdata(serio, NULL); 108 kfree(gunze); 109 } 110 111 /* 112 * gunze_connect() is the routine that is called when someone adds a 113 * new serio device that supports Gunze protocol and registers it as 114 * an input device. 115 */ 116 117 static int gunze_connect(struct serio *serio, struct serio_driver *drv) 118 { 119 struct gunze *gunze; 120 int err; 121 122 if (!(gunze = kmalloc(sizeof(struct gunze), GFP_KERNEL))) 123 return -ENOMEM; 124 125 memset(gunze, 0, sizeof(struct gunze)); 126 127 init_input_dev(&gunze->dev); 128 gunze->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); 129 gunze->dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); 130 input_set_abs_params(&gunze->dev, ABS_X, 24, 1000, 0, 0); 131 input_set_abs_params(&gunze->dev, ABS_Y, 24, 1000, 0, 0); 132 133 gunze->serio = serio; 134 135 sprintf(gunze->phys, "%s/input0", serio->phys); 136 137 gunze->dev.private = gunze; 138 gunze->dev.name = gunze_name; 139 gunze->dev.phys = gunze->phys; 140 gunze->dev.id.bustype = BUS_RS232; 141 gunze->dev.id.vendor = SERIO_GUNZE; 142 gunze->dev.id.product = 0x0051; 143 gunze->dev.id.version = 0x0100; 144 145 serio_set_drvdata(serio, gunze); 146 147 err = serio_open(serio, drv); 148 if (err) { 149 serio_set_drvdata(serio, NULL); 150 kfree(gunze); 151 return err; 152 } 153 154 input_register_device(&gunze->dev); 155 156 printk(KERN_INFO "input: %s on %s\n", gunze_name, serio->phys); 157 158 return 0; 159 } 160 161 /* 162 * The serio driver structure. 163 */ 164 165 static struct serio_device_id gunze_serio_ids[] = { 166 { 167 .type = SERIO_RS232, 168 .proto = SERIO_GUNZE, 169 .id = SERIO_ANY, 170 .extra = SERIO_ANY, 171 }, 172 { 0 } 173 }; 174 175 MODULE_DEVICE_TABLE(serio, gunze_serio_ids); 176 177 static struct serio_driver gunze_drv = { 178 .driver = { 179 .name = "gunze", 180 }, 181 .description = DRIVER_DESC, 182 .id_table = gunze_serio_ids, 183 .interrupt = gunze_interrupt, 184 .connect = gunze_connect, 185 .disconnect = gunze_disconnect, 186 }; 187 188 /* 189 * The functions for inserting/removing us as a module. 190 */ 191 192 static int __init gunze_init(void) 193 { 194 serio_register_driver(&gunze_drv); 195 return 0; 196 } 197 198 static void __exit gunze_exit(void) 199 { 200 serio_unregister_driver(&gunze_drv); 201 } 202 203 module_init(gunze_init); 204 module_exit(gunze_exit); 205