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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 | // SPDX-License-Identifier: GPL-2.0-only /* * Touchright 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> */ #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 "Touchright serial touchscreen driver" MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>"); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); /* * Definitions & global arrays. */ #define TR_FORMAT_TOUCH_BIT 0x01 #define TR_FORMAT_STATUS_BYTE 0x40 #define TR_FORMAT_STATUS_MASK ~TR_FORMAT_TOUCH_BIT #define TR_LENGTH 5 #define TR_MIN_XC 0 #define TR_MAX_XC 0x1ff #define TR_MIN_YC 0 #define TR_MAX_YC 0x1ff /* * Per-touchscreen data. */ struct tr { struct input_dev *dev; struct serio *serio; int idx; unsigned char data[TR_LENGTH]; char phys[32]; }; static irqreturn_t tr_interrupt(struct serio *serio, unsigned char data, unsigned int flags) { struct tr *tr = serio_get_drvdata(serio); struct input_dev *dev = tr->dev; tr->data[tr->idx] = data; if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) { if (++tr->idx == TR_LENGTH) { input_report_abs(dev, ABS_X, (tr->data[1] << 5) | (tr->data[2] >> 1)); input_report_abs(dev, ABS_Y, (tr->data[3] << 5) | (tr->data[4] >> 1)); input_report_key(dev, BTN_TOUCH, tr->data[0] & TR_FORMAT_TOUCH_BIT); input_sync(dev); tr->idx = 0; } } return IRQ_HANDLED; } /* * tr_disconnect() is the opposite of tr_connect() */ static void tr_disconnect(struct serio *serio) { struct tr *tr = serio_get_drvdata(serio); input_get_device(tr->dev); input_unregister_device(tr->dev); serio_close(serio); serio_set_drvdata(serio, NULL); input_put_device(tr->dev); kfree(tr); } /* * tr_connect() is the routine that is called when someone adds a * new serio device that supports the Touchright protocol and registers it as * an input device. */ static int tr_connect(struct serio *serio, struct serio_driver *drv) { struct tr *tr; struct input_dev *input_dev; int err; tr = kzalloc(sizeof(struct tr), GFP_KERNEL); input_dev = input_allocate_device(); if (!tr || !input_dev) { err = -ENOMEM; goto fail1; } tr->serio = serio; tr->dev = input_dev; snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys); input_dev->name = "Touchright Serial TouchScreen"; input_dev->phys = tr->phys; input_dev->id.bustype = BUS_RS232; input_dev->id.vendor = SERIO_TOUCHRIGHT; 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(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0); input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0); serio_set_drvdata(serio, tr); err = serio_open(serio, drv); if (err) goto fail2; err = input_register_device(tr->dev); if (err) goto fail3; return 0; fail3: serio_close(serio); fail2: serio_set_drvdata(serio, NULL); fail1: input_free_device(input_dev); kfree(tr); return err; } /* * The serio driver structure. */ static const struct serio_device_id tr_serio_ids[] = { { .type = SERIO_RS232, .proto = SERIO_TOUCHRIGHT, .id = SERIO_ANY, .extra = SERIO_ANY, }, { 0 } }; MODULE_DEVICE_TABLE(serio, tr_serio_ids); static struct serio_driver tr_drv = { .driver = { .name = "touchright", }, .description = DRIVER_DESC, .id_table = tr_serio_ids, .interrupt = tr_interrupt, .connect = tr_connect, .disconnect = tr_disconnect, }; module_serio_driver(tr_drv); |