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 /* 52 * Per-touchscreen data. 53 */ 54 55 struct gunze { 56 struct input_dev *dev; 57 struct serio *serio; 58 int idx; 59 unsigned char data[GUNZE_MAX_LENGTH]; 60 char phys[32]; 61 }; 62 63 static void gunze_process_packet(struct gunze* gunze, struct pt_regs *regs) 64 { 65 struct input_dev *dev = gunze->dev; 66 67 if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' || 68 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) { 69 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data); 70 return; 71 } 72 73 input_regs(dev, regs); 74 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10)); 75 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10)); 76 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T'); 77 input_sync(dev); 78 } 79 80 static irqreturn_t gunze_interrupt(struct serio *serio, 81 unsigned char data, unsigned int flags, struct pt_regs *regs) 82 { 83 struct gunze* gunze = serio_get_drvdata(serio); 84 85 if (data == '\r') { 86 gunze_process_packet(gunze, regs); 87 gunze->idx = 0; 88 } else { 89 if (gunze->idx < GUNZE_MAX_LENGTH) 90 gunze->data[gunze->idx++] = data; 91 } 92 return IRQ_HANDLED; 93 } 94 95 /* 96 * gunze_disconnect() is the opposite of gunze_connect() 97 */ 98 99 static void gunze_disconnect(struct serio *serio) 100 { 101 struct gunze *gunze = serio_get_drvdata(serio); 102 103 input_get_device(gunze->dev); 104 input_unregister_device(gunze->dev); 105 serio_close(serio); 106 serio_set_drvdata(serio, NULL); 107 input_put_device(gunze->dev); 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 struct input_dev *input_dev; 121 int err; 122 123 gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL); 124 input_dev = input_allocate_device(); 125 if (!gunze || !input_dev) { 126 err = -ENOMEM; 127 goto fail; 128 } 129 130 gunze->serio = serio; 131 gunze->dev = input_dev; 132 sprintf(gunze->phys, "%s/input0", serio->phys); 133 134 input_dev->private = gunze; 135 input_dev->name = "Gunze AHL-51S TouchScreen"; 136 input_dev->phys = gunze->phys; 137 input_dev->id.bustype = BUS_RS232; 138 input_dev->id.vendor = SERIO_GUNZE; 139 input_dev->id.product = 0x0051; 140 input_dev->id.version = 0x0100; 141 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); 142 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); 143 input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0); 144 input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0); 145 146 serio_set_drvdata(serio, gunze); 147 148 err = serio_open(serio, drv); 149 if (err) 150 goto fail; 151 152 input_register_device(gunze->dev); 153 return 0; 154 155 fail: serio_set_drvdata(serio, NULL); 156 input_free_device(input_dev); 157 kfree(gunze); 158 return err; 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