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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 | // SPDX-License-Identifier: GPL-2.0-only /* * Touchwindow serial touchscreen driver * * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com> * * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c) * Copyright (c) 2004 Vojtech Pavlik * and Dan Streetman <ddstreet@ieee.org> */ /* * 2005/02/19 Rick Koch: * The Touchwindow I used is made by Edmark Corp. and * constantly outputs a stream of 0's unless it is touched. * It then outputs 3 bytes: X, Y, and a copy of Y. */ #include <linux/errno.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/input.h> #include <linux/serio.h> #define DRIVER_DESC "Touchwindow serial touchscreen driver" MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>"); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); /* * Definitions & global arrays. */ #define TW_LENGTH 3 #define TW_MIN_XC 0 #define TW_MAX_XC 0xff #define TW_MIN_YC 0 #define TW_MAX_YC 0xff /* * Per-touchscreen data. */ struct tw { struct input_dev *dev; struct serio *serio; int idx; int touched; unsigned char data[TW_LENGTH]; char phys[32]; }; static irqreturn_t tw_interrupt(struct serio *serio, unsigned char data, unsigned int flags) { struct tw *tw = serio_get_drvdata(serio); struct input_dev *dev = tw->dev; if (data) { /* touch */ tw->touched = 1; tw->data[tw->idx++] = data; /* verify length and that the two Y's are the same */ if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) { input_report_abs(dev, ABS_X, tw->data[0]); input_report_abs(dev, ABS_Y, tw->data[1]); input_report_key(dev, BTN_TOUCH, 1); input_sync(dev); tw->idx = 0; } } else if (tw->touched) { /* untouch */ input_report_key(dev, BTN_TOUCH, 0); input_sync(dev); tw->idx = 0; tw->touched = 0; } return IRQ_HANDLED; } /* * tw_disconnect() is the opposite of tw_connect() */ static void tw_disconnect(struct serio *serio) { struct tw *tw = serio_get_drvdata(serio); input_get_device(tw->dev); input_unregister_device(tw->dev); serio_close(serio); serio_set_drvdata(serio, NULL); input_put_device(tw->dev); kfree(tw); } /* * tw_connect() is the routine that is called when someone adds a * new serio device that supports the Touchwin protocol and registers it as * an input device. */ static int tw_connect(struct serio *serio, struct serio_driver *drv) { struct tw *tw; struct input_dev *input_dev; int err; tw = kzalloc(sizeof(struct tw), GFP_KERNEL); input_dev = input_allocate_device(); if (!tw || !input_dev) { err = -ENOMEM; goto fail1; } tw->serio = serio; tw->dev = input_dev; snprintf(tw->phys, sizeof(tw->phys), "%s/input0", serio->phys); input_dev->name = "Touchwindow Serial TouchScreen"; input_dev->phys = tw->phys; input_dev->id.bustype = BUS_RS232; input_dev->id.vendor = SERIO_TOUCHWIN; input_dev->id.product = 0; input_dev->id.version = 0x0100; input_dev->dev.parent = &serio->dev; input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0); input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0); serio_set_drvdata(serio, tw); err = serio_open(serio, drv); if (err) goto fail2; err = input_register_device(tw->dev); if (err) goto fail3; return 0; fail3: serio_close(serio); fail2: serio_set_drvdata(serio, NULL); fail1: input_free_device(input_dev); kfree(tw); return err; } /* * The serio driver structure. */ static const struct serio_device_id tw_serio_ids[] = { { .type = SERIO_RS232, .proto = SERIO_TOUCHWIN, .id = SERIO_ANY, .extra = SERIO_ANY, }, { 0 } }; MODULE_DEVICE_TABLE(serio, tw_serio_ids); static struct serio_driver tw_drv = { .driver = { .name = "touchwin", }, .description = DRIVER_DESC, .id_table = tw_serio_ids, .interrupt = tw_interrupt, .connect = tw_connect, .disconnect = tw_disconnect, }; module_serio_driver(tw_drv); |