1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Dynapro serial touchscreen driver 4 * 5 * Copyright (c) 2009 Tias Guns 6 * Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and 7 * Richard Lemon 8 */ 9 10 11 /* 12 * 2009/09/19 Tias Guns <tias@ulyssis.org> 13 * Copied inexio.c and edited for Dynapro protocol (from retired Xorg module) 14 */ 15 16 #include <linux/errno.h> 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/slab.h> 20 #include <linux/input.h> 21 #include <linux/serio.h> 22 23 #define DRIVER_DESC "Dynapro serial touchscreen driver" 24 25 MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>"); 26 MODULE_DESCRIPTION(DRIVER_DESC); 27 MODULE_LICENSE("GPL"); 28 29 /* 30 * Definitions & global arrays. 31 */ 32 33 #define DYNAPRO_FORMAT_TOUCH_BIT 0x40 34 #define DYNAPRO_FORMAT_LENGTH 3 35 #define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80 36 37 #define DYNAPRO_MIN_XC 0 38 #define DYNAPRO_MAX_XC 0x3ff 39 #define DYNAPRO_MIN_YC 0 40 #define DYNAPRO_MAX_YC 0x3ff 41 42 #define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4)) 43 #define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7)) 44 #define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0]) 45 46 /* 47 * Per-touchscreen data. 48 */ 49 50 struct dynapro { 51 struct input_dev *dev; 52 struct serio *serio; 53 int idx; 54 unsigned char data[DYNAPRO_FORMAT_LENGTH]; 55 char phys[32]; 56 }; 57 58 static void dynapro_process_data(struct dynapro *pdynapro) 59 { 60 struct input_dev *dev = pdynapro->dev; 61 62 if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) { 63 input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data)); 64 input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data)); 65 input_report_key(dev, BTN_TOUCH, 66 DYNAPRO_GET_TOUCHED(pdynapro->data)); 67 input_sync(dev); 68 69 pdynapro->idx = 0; 70 } 71 } 72 73 static irqreturn_t dynapro_interrupt(struct serio *serio, 74 unsigned char data, unsigned int flags) 75 { 76 struct dynapro *pdynapro = serio_get_drvdata(serio); 77 78 pdynapro->data[pdynapro->idx] = data; 79 80 if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0]) 81 dynapro_process_data(pdynapro); 82 else 83 dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n", 84 pdynapro->data[0]); 85 86 return IRQ_HANDLED; 87 } 88 89 static void dynapro_disconnect(struct serio *serio) 90 { 91 struct dynapro *pdynapro = serio_get_drvdata(serio); 92 93 input_get_device(pdynapro->dev); 94 input_unregister_device(pdynapro->dev); 95 serio_close(serio); 96 serio_set_drvdata(serio, NULL); 97 input_put_device(pdynapro->dev); 98 kfree(pdynapro); 99 } 100 101 /* 102 * dynapro_connect() is the routine that is called when someone adds a 103 * new serio device that supports dynapro protocol and registers it as 104 * an input device. This is usually accomplished using inputattach. 105 */ 106 107 static int dynapro_connect(struct serio *serio, struct serio_driver *drv) 108 { 109 struct dynapro *pdynapro; 110 struct input_dev *input_dev; 111 int err; 112 113 pdynapro = kzalloc(sizeof(*pdynapro), GFP_KERNEL); 114 input_dev = input_allocate_device(); 115 if (!pdynapro || !input_dev) { 116 err = -ENOMEM; 117 goto fail1; 118 } 119 120 pdynapro->serio = serio; 121 pdynapro->dev = input_dev; 122 snprintf(pdynapro->phys, sizeof(pdynapro->phys), 123 "%s/input0", serio->phys); 124 125 input_dev->name = "Dynapro Serial TouchScreen"; 126 input_dev->phys = pdynapro->phys; 127 input_dev->id.bustype = BUS_RS232; 128 input_dev->id.vendor = SERIO_DYNAPRO; 129 input_dev->id.product = 0; 130 input_dev->id.version = 0x0001; 131 input_dev->dev.parent = &serio->dev; 132 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 133 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 134 input_set_abs_params(pdynapro->dev, ABS_X, 135 DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0); 136 input_set_abs_params(pdynapro->dev, ABS_Y, 137 DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0); 138 139 serio_set_drvdata(serio, pdynapro); 140 141 err = serio_open(serio, drv); 142 if (err) 143 goto fail2; 144 145 err = input_register_device(pdynapro->dev); 146 if (err) 147 goto fail3; 148 149 return 0; 150 151 fail3: serio_close(serio); 152 fail2: serio_set_drvdata(serio, NULL); 153 fail1: input_free_device(input_dev); 154 kfree(pdynapro); 155 return err; 156 } 157 158 /* 159 * The serio driver structure. 160 */ 161 162 static const struct serio_device_id dynapro_serio_ids[] = { 163 { 164 .type = SERIO_RS232, 165 .proto = SERIO_DYNAPRO, 166 .id = SERIO_ANY, 167 .extra = SERIO_ANY, 168 }, 169 { 0 } 170 }; 171 172 MODULE_DEVICE_TABLE(serio, dynapro_serio_ids); 173 174 static struct serio_driver dynapro_drv = { 175 .driver = { 176 .name = "dynapro", 177 }, 178 .description = DRIVER_DESC, 179 .id_table = dynapro_serio_ids, 180 .interrupt = dynapro_interrupt, 181 .connect = dynapro_connect, 182 .disconnect = dynapro_disconnect, 183 }; 184 185 module_serio_driver(dynapro_drv); 186