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 36 #define DRIVER_DESC "Gunze AHL-51S touchscreen driver" 37 38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 39 MODULE_DESCRIPTION(DRIVER_DESC); 40 MODULE_LICENSE("GPL"); 41 42 /* 43 * Definitions & global arrays. 44 */ 45 46 #define GUNZE_MAX_LENGTH 10 47 48 /* 49 * Per-touchscreen data. 50 */ 51 52 struct gunze { 53 struct input_dev *dev; 54 struct serio *serio; 55 int idx; 56 unsigned char data[GUNZE_MAX_LENGTH]; 57 char phys[32]; 58 }; 59 60 static void gunze_process_packet(struct gunze* gunze) 61 { 62 struct input_dev *dev = gunze->dev; 63 64 if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' || 65 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) { 66 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data); 67 return; 68 } 69 70 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10)); 71 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10)); 72 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T'); 73 input_sync(dev); 74 } 75 76 static irqreturn_t gunze_interrupt(struct serio *serio, 77 unsigned char data, unsigned int flags) 78 { 79 struct gunze* gunze = serio_get_drvdata(serio); 80 81 if (data == '\r') { 82 gunze_process_packet(gunze); 83 gunze->idx = 0; 84 } else { 85 if (gunze->idx < GUNZE_MAX_LENGTH) 86 gunze->data[gunze->idx++] = data; 87 } 88 return IRQ_HANDLED; 89 } 90 91 /* 92 * gunze_disconnect() is the opposite of gunze_connect() 93 */ 94 95 static void gunze_disconnect(struct serio *serio) 96 { 97 struct gunze *gunze = serio_get_drvdata(serio); 98 99 input_get_device(gunze->dev); 100 input_unregister_device(gunze->dev); 101 serio_close(serio); 102 serio_set_drvdata(serio, NULL); 103 input_put_device(gunze->dev); 104 kfree(gunze); 105 } 106 107 /* 108 * gunze_connect() is the routine that is called when someone adds a 109 * new serio device that supports Gunze protocol and registers it as 110 * an input device. 111 */ 112 113 static int gunze_connect(struct serio *serio, struct serio_driver *drv) 114 { 115 struct gunze *gunze; 116 struct input_dev *input_dev; 117 int err; 118 119 gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL); 120 input_dev = input_allocate_device(); 121 if (!gunze || !input_dev) { 122 err = -ENOMEM; 123 goto fail1; 124 } 125 126 gunze->serio = serio; 127 gunze->dev = input_dev; 128 snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys); 129 130 input_dev->name = "Gunze AHL-51S TouchScreen"; 131 input_dev->phys = gunze->phys; 132 input_dev->id.bustype = BUS_RS232; 133 input_dev->id.vendor = SERIO_GUNZE; 134 input_dev->id.product = 0x0051; 135 input_dev->id.version = 0x0100; 136 input_dev->dev.parent = &serio->dev; 137 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 138 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 139 input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0); 140 input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0); 141 142 serio_set_drvdata(serio, gunze); 143 144 err = serio_open(serio, drv); 145 if (err) 146 goto fail2; 147 148 err = input_register_device(gunze->dev); 149 if (err) 150 goto fail3; 151 152 return 0; 153 154 fail3: serio_close(serio); 155 fail2: serio_set_drvdata(serio, NULL); 156 fail1: 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 module_serio_driver(gunze_drv); 189