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) 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_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10)); 74 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10)); 75 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T'); 76 input_sync(dev); 77 } 78 79 static irqreturn_t gunze_interrupt(struct serio *serio, 80 unsigned char data, unsigned int flags) 81 { 82 struct gunze* gunze = serio_get_drvdata(serio); 83 84 if (data == '\r') { 85 gunze_process_packet(gunze); 86 gunze->idx = 0; 87 } else { 88 if (gunze->idx < GUNZE_MAX_LENGTH) 89 gunze->data[gunze->idx++] = data; 90 } 91 return IRQ_HANDLED; 92 } 93 94 /* 95 * gunze_disconnect() is the opposite of gunze_connect() 96 */ 97 98 static void gunze_disconnect(struct serio *serio) 99 { 100 struct gunze *gunze = serio_get_drvdata(serio); 101 102 input_get_device(gunze->dev); 103 input_unregister_device(gunze->dev); 104 serio_close(serio); 105 serio_set_drvdata(serio, NULL); 106 input_put_device(gunze->dev); 107 kfree(gunze); 108 } 109 110 /* 111 * gunze_connect() is the routine that is called when someone adds a 112 * new serio device that supports Gunze protocol and registers it as 113 * an input device. 114 */ 115 116 static int gunze_connect(struct serio *serio, struct serio_driver *drv) 117 { 118 struct gunze *gunze; 119 struct input_dev *input_dev; 120 int err; 121 122 gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL); 123 input_dev = input_allocate_device(); 124 if (!gunze || !input_dev) { 125 err = -ENOMEM; 126 goto fail1; 127 } 128 129 gunze->serio = serio; 130 gunze->dev = input_dev; 131 snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys); 132 133 input_dev->name = "Gunze AHL-51S TouchScreen"; 134 input_dev->phys = gunze->phys; 135 input_dev->id.bustype = BUS_RS232; 136 input_dev->id.vendor = SERIO_GUNZE; 137 input_dev->id.product = 0x0051; 138 input_dev->id.version = 0x0100; 139 input_dev->dev.parent = &serio->dev; 140 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 141 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 142 input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0); 143 input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0); 144 145 serio_set_drvdata(serio, gunze); 146 147 err = serio_open(serio, drv); 148 if (err) 149 goto fail2; 150 151 err = input_register_device(gunze->dev); 152 if (err) 153 goto fail3; 154 155 return 0; 156 157 fail3: serio_close(serio); 158 fail2: serio_set_drvdata(serio, NULL); 159 fail1: input_free_device(input_dev); 160 kfree(gunze); 161 return err; 162 } 163 164 /* 165 * The serio driver structure. 166 */ 167 168 static struct serio_device_id gunze_serio_ids[] = { 169 { 170 .type = SERIO_RS232, 171 .proto = SERIO_GUNZE, 172 .id = SERIO_ANY, 173 .extra = SERIO_ANY, 174 }, 175 { 0 } 176 }; 177 178 MODULE_DEVICE_TABLE(serio, gunze_serio_ids); 179 180 static struct serio_driver gunze_drv = { 181 .driver = { 182 .name = "gunze", 183 }, 184 .description = DRIVER_DESC, 185 .id_table = gunze_serio_ids, 186 .interrupt = gunze_interrupt, 187 .connect = gunze_connect, 188 .disconnect = gunze_disconnect, 189 }; 190 191 /* 192 * The functions for inserting/removing us as a module. 193 */ 194 195 static int __init gunze_init(void) 196 { 197 return serio_register_driver(&gunze_drv); 198 } 199 200 static void __exit gunze_exit(void) 201 { 202 serio_unregister_driver(&gunze_drv); 203 } 204 205 module_init(gunze_init); 206 module_exit(gunze_exit); 207