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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 | // SPDX-License-Identifier: GPL-2.0-only /* * Fujitsu serial touchscreen driver * * Copyright (c) Dmitry Torokhov <dtor@mail.ru> */ #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 "Fujitsu serial touchscreen driver" MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>"); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); #define FUJITSU_LENGTH 5 /* * Per-touchscreen data. */ struct fujitsu { struct input_dev *dev; struct serio *serio; int idx; unsigned char data[FUJITSU_LENGTH]; char phys[32]; }; /* * Decode serial data (5 bytes per packet) * First byte * 1 C 0 0 R S S S * Where C is 1 while in calibration mode (which we don't use) * R is 1 when no coordinate corection was done. * S are button state */ static irqreturn_t fujitsu_interrupt(struct serio *serio, unsigned char data, unsigned int flags) { struct fujitsu *fujitsu = serio_get_drvdata(serio); struct input_dev *dev = fujitsu->dev; if (fujitsu->idx == 0) { /* resync skip until start of frame */ if ((data & 0xf0) != 0x80) return IRQ_HANDLED; } else { /* resync skip garbage */ if (data & 0x80) { fujitsu->idx = 0; return IRQ_HANDLED; } } fujitsu->data[fujitsu->idx++] = data; if (fujitsu->idx == FUJITSU_LENGTH) { input_report_abs(dev, ABS_X, (fujitsu->data[2] << 7) | fujitsu->data[1]); input_report_abs(dev, ABS_Y, (fujitsu->data[4] << 7) | fujitsu->data[3]); input_report_key(dev, BTN_TOUCH, (fujitsu->data[0] & 0x03) != 2); input_sync(dev); fujitsu->idx = 0; } return IRQ_HANDLED; } /* * fujitsu_disconnect() is the opposite of fujitsu_connect() */ static void fujitsu_disconnect(struct serio *serio) { struct fujitsu *fujitsu = serio_get_drvdata(serio); input_get_device(fujitsu->dev); input_unregister_device(fujitsu->dev); serio_close(serio); serio_set_drvdata(serio, NULL); input_put_device(fujitsu->dev); kfree(fujitsu); } /* * fujitsu_connect() is the routine that is called when someone adds a * new serio device that supports the Fujitsu protocol and registers it * as input device. */ static int fujitsu_connect(struct serio *serio, struct serio_driver *drv) { struct fujitsu *fujitsu; struct input_dev *input_dev; int err; fujitsu = kzalloc(sizeof(*fujitsu), GFP_KERNEL); input_dev = input_allocate_device(); if (!fujitsu || !input_dev) { err = -ENOMEM; goto fail1; } fujitsu->serio = serio; fujitsu->dev = input_dev; snprintf(fujitsu->phys, sizeof(fujitsu->phys), "%s/input0", serio->phys); input_dev->name = "Fujitsu Serial Touchscreen"; input_dev->phys = fujitsu->phys; input_dev->id.bustype = BUS_RS232; input_dev->id.vendor = SERIO_FUJITSU; input_dev->id.product = 0; input_dev->id.version = 0x0100; 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(input_dev, ABS_X, 0, 4096, 0, 0); input_set_abs_params(input_dev, ABS_Y, 0, 4096, 0, 0); serio_set_drvdata(serio, fujitsu); err = serio_open(serio, drv); if (err) goto fail2; err = input_register_device(fujitsu->dev); if (err) goto fail3; return 0; fail3: serio_close(serio); fail2: serio_set_drvdata(serio, NULL); fail1: input_free_device(input_dev); kfree(fujitsu); return err; } /* * The serio driver structure. */ static const struct serio_device_id fujitsu_serio_ids[] = { { .type = SERIO_RS232, .proto = SERIO_FUJITSU, .id = SERIO_ANY, .extra = SERIO_ANY, }, { 0 } }; MODULE_DEVICE_TABLE(serio, fujitsu_serio_ids); static struct serio_driver fujitsu_drv = { .driver = { .name = "fujitsu_ts", }, .description = DRIVER_DESC, .id_table = fujitsu_serio_ids, .interrupt = fujitsu_interrupt, .connect = fujitsu_connect, .disconnect = fujitsu_disconnect, }; module_serio_driver(fujitsu_drv); |