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 25 #include <linux/errno.h> 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/slab.h> 29 #include <linux/input.h> 30 #include <linux/serio.h> 31 32 #define DRIVER_DESC "Gunze AHL-51S touchscreen driver" 33 34 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 35 MODULE_DESCRIPTION(DRIVER_DESC); 36 MODULE_LICENSE("GPL"); 37 38 /* 39 * Definitions & global arrays. 40 */ 41 42 #define GUNZE_MAX_LENGTH 10 43 44 /* 45 * Per-touchscreen data. 46 */ 47 48 struct gunze { 49 struct input_dev *dev; 50 struct serio *serio; 51 int idx; 52 unsigned char data[GUNZE_MAX_LENGTH]; 53 char phys[32]; 54 }; 55 56 static void gunze_process_packet(struct gunze *gunze) 57 { 58 struct input_dev *dev = gunze->dev; 59 60 if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' || 61 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) { 62 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data); 63 return; 64 } 65 66 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10)); 67 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10)); 68 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T'); 69 input_sync(dev); 70 } 71 72 static irqreturn_t gunze_interrupt(struct serio *serio, 73 unsigned char data, unsigned int flags) 74 { 75 struct gunze *gunze = serio_get_drvdata(serio); 76 77 if (data == '\r') { 78 gunze_process_packet(gunze); 79 gunze->idx = 0; 80 } else { 81 if (gunze->idx < GUNZE_MAX_LENGTH) 82 gunze->data[gunze->idx++] = data; 83 } 84 return IRQ_HANDLED; 85 } 86 87 /* 88 * gunze_disconnect() is the opposite of gunze_connect() 89 */ 90 91 static void gunze_disconnect(struct serio *serio) 92 { 93 struct gunze *gunze = serio_get_drvdata(serio); 94 95 input_get_device(gunze->dev); 96 input_unregister_device(gunze->dev); 97 serio_close(serio); 98 serio_set_drvdata(serio, NULL); 99 input_put_device(gunze->dev); 100 kfree(gunze); 101 } 102 103 /* 104 * gunze_connect() is the routine that is called when someone adds a 105 * new serio device that supports Gunze protocol and registers it as 106 * an input device. 107 */ 108 109 static int gunze_connect(struct serio *serio, struct serio_driver *drv) 110 { 111 struct gunze *gunze; 112 struct input_dev *input_dev; 113 int err; 114 115 gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL); 116 input_dev = input_allocate_device(); 117 if (!gunze || !input_dev) { 118 err = -ENOMEM; 119 goto fail1; 120 } 121 122 gunze->serio = serio; 123 gunze->dev = input_dev; 124 snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys); 125 126 input_dev->name = "Gunze AHL-51S TouchScreen"; 127 input_dev->phys = gunze->phys; 128 input_dev->id.bustype = BUS_RS232; 129 input_dev->id.vendor = SERIO_GUNZE; 130 input_dev->id.product = 0x0051; 131 input_dev->id.version = 0x0100; 132 input_dev->dev.parent = &serio->dev; 133 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 134 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 135 input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0); 136 input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0); 137 138 serio_set_drvdata(serio, gunze); 139 140 err = serio_open(serio, drv); 141 if (err) 142 goto fail2; 143 144 err = input_register_device(gunze->dev); 145 if (err) 146 goto fail3; 147 148 return 0; 149 150 fail3: serio_close(serio); 151 fail2: serio_set_drvdata(serio, NULL); 152 fail1: input_free_device(input_dev); 153 kfree(gunze); 154 return err; 155 } 156 157 /* 158 * The serio driver structure. 159 */ 160 161 static const struct serio_device_id gunze_serio_ids[] = { 162 { 163 .type = SERIO_RS232, 164 .proto = SERIO_GUNZE, 165 .id = SERIO_ANY, 166 .extra = SERIO_ANY, 167 }, 168 { 0 } 169 }; 170 171 MODULE_DEVICE_TABLE(serio, gunze_serio_ids); 172 173 static struct serio_driver gunze_drv = { 174 .driver = { 175 .name = "gunze", 176 }, 177 .description = DRIVER_DESC, 178 .id_table = gunze_serio_ids, 179 .interrupt = gunze_interrupt, 180 .connect = gunze_connect, 181 .disconnect = gunze_disconnect, 182 }; 183 184 module_serio_driver(gunze_drv); 185