1 // SPDX-License-Identifier: GPL-2.0-only
3  * Sahara TouchIT-213 serial touchscreen driver
5  * Copyright (c) 2007-2008 Claudio Nieder <private@claudio.ch>
21 #define DRIVER_DESC	"Sahara TouchIT-213 serial touchscreen driver"
35  *   +--------+   +--------+   +--------+   +--------+   +--------+
37  *   +--------+   +--------+   +--------+   +--------+   +--------+
45  * presented, x is the horizontal axis with values growing from left to
46  * right and y is the vertical axis with values growing from top to
50  * correct position, x ist the vertical axis with values growing from
51  * top to bottom and y is the horizontal axis with values growing from
60  * On my Sahara Touch-IT 213 I have observed x values from 0 to 0x7f0
70  * Per-touchscreen data.
86 	struct input_dev *dev = touchit213->dev;  in touchit213_interrupt()
88 	touchit213->data[touchit213->idx] = data;  in touchit213_interrupt()
90 	switch (touchit213->idx++) {  in touchit213_interrupt()
92 		if ((touchit213->data[0] & T213_FORMAT_STATUS_MASK) !=  in touchit213_interrupt()
94 			pr_debug("unsynchronized data: 0x%02x\n", data);  in touchit213_interrupt()
95 			touchit213->idx = 0;  in touchit213_interrupt()
100 		touchit213->idx = 0;  in touchit213_interrupt()
102 			(touchit213->data[1] << 7) | touchit213->data[2]);  in touchit213_interrupt()
104 			(touchit213->data[3] << 7) | touchit213->data[4]);  in touchit213_interrupt()
106 			touchit213->data[0] & T213_FORMAT_TOUCH_BIT);  in touchit213_interrupt()
122 	input_get_device(touchit213->dev);  in touchit213_disconnect()
123 	input_unregister_device(touchit213->dev);  in touchit213_disconnect()
126 	input_put_device(touchit213->dev);  in touchit213_disconnect()
145 		err = -ENOMEM;  in touchit213_connect()
149 	touchit213->serio = serio;  in touchit213_connect()
150 	touchit213->dev = input_dev;  in touchit213_connect()
151 	snprintf(touchit213->phys, sizeof(touchit213->phys),  in touchit213_connect()
152 		 "%s/input0", serio->phys);  in touchit213_connect()
154 	input_dev->name = "Sahara Touch-iT213 Serial TouchScreen";  in touchit213_connect()
155 	input_dev->phys = touchit213->phys;  in touchit213_connect()
156 	input_dev->id.bustype = BUS_RS232;  in touchit213_connect()
157 	input_dev->id.vendor = SERIO_TOUCHIT213;  in touchit213_connect()
158 	input_dev->id.product = 0;  in touchit213_connect()
159 	input_dev->id.version = 0x0100;  in touchit213_connect()
160 	input_dev->dev.parent = &serio->dev;  in touchit213_connect()
161 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);  in touchit213_connect()
162 	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);  in touchit213_connect()
163 	input_set_abs_params(touchit213->dev, ABS_X,  in touchit213_connect()
165 	input_set_abs_params(touchit213->dev, ABS_Y,  in touchit213_connect()
174 	err = input_register_device(touchit213->dev);  in touchit213_connect()