Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Sahara TouchIT-213 serial touchscreen driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2007-2008 Claudio Nieder <private@claudio.ch>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Based on Touchright driver (drivers/input/touchscreen/touchright.c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Copyright (c) 2004 Vojtech Pavlik
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * and Dan Streetman <ddstreet@ieee.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/serio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define DRIVER_DESC	"Sahara TouchIT-213 serial touchscreen driver"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) MODULE_DESCRIPTION(DRIVER_DESC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  * Definitions & global arrays.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  * Data is received through COM1 at 9600bit/s,8bit,no parity in packets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  * of 5 byte each.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  *   +--------+   +--------+   +--------+   +--------+   +--------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  *   |1000000p|   |0xxxxxxx|   |0xxxxxxx|   |0yyyyyyy|   |0yyyyyyy|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  *   +--------+   +--------+   +--------+   +--------+   +--------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  *                    MSB          LSB          MSB          LSB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * The value of p is 1 as long as the screen is touched and 0 when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * reporting the location where touching stopped, e.g. where the pen was
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * lifted from the screen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * When holding the screen in landscape mode as the BIOS text output is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * presented, x is the horizontal axis with values growing from left to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * right and y is the vertical axis with values growing from top to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  * bottom.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  * When holding the screen in portrait mode with the Sahara logo in its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * correct position, x ist the vertical axis with values growing from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  * top to bottom and y is the horizontal axis with values growing from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * right to left.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) #define T213_FORMAT_TOUCH_BIT	0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) #define T213_FORMAT_STATUS_BYTE	0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) #define T213_FORMAT_STATUS_MASK	~T213_FORMAT_TOUCH_BIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  * On my Sahara Touch-IT 213 I have observed x values from 0 to 0x7f0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  * and y values from 0x1d to 0x7e9, so the actual measurement is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  * probably done with an 11 bit precision.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) #define T213_MIN_XC 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) #define T213_MAX_XC 0x07ff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) #define T213_MIN_YC 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) #define T213_MAX_YC 0x07ff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70)  * Per-touchscreen data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) struct touchit213 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	struct input_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	struct serio *serio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	unsigned char csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	unsigned char data[5];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	char phys[32];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) static irqreturn_t touchit213_interrupt(struct serio *serio,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		unsigned char data, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	struct touchit213 *touchit213 = serio_get_drvdata(serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	struct input_dev *dev = touchit213->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	touchit213->data[touchit213->idx] = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	switch (touchit213->idx++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		if ((touchit213->data[0] & T213_FORMAT_STATUS_MASK) !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 				T213_FORMAT_STATUS_BYTE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			pr_debug("unsynchronized data: 0x%02x\n", data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			touchit213->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		touchit213->idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		input_report_abs(dev, ABS_X,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			(touchit213->data[1] << 7) | touchit213->data[2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		input_report_abs(dev, ABS_Y,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			(touchit213->data[3] << 7) | touchit213->data[4]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		input_report_key(dev, BTN_TOUCH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			touchit213->data[0] & T213_FORMAT_TOUCH_BIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		input_sync(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)  * touchit213_disconnect() is the opposite of touchit213_connect()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static void touchit213_disconnect(struct serio *serio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	struct touchit213 *touchit213 = serio_get_drvdata(serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	input_get_device(touchit213->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	input_unregister_device(touchit213->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	serio_close(serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	serio_set_drvdata(serio, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	input_put_device(touchit213->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	kfree(touchit213);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)  * touchit213_connect() is the routine that is called when someone adds a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)  * new serio device that supports the Touchright protocol and registers it as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  * an input device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static int touchit213_connect(struct serio *serio, struct serio_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	struct touchit213 *touchit213;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	struct input_dev *input_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	touchit213 = kzalloc(sizeof(struct touchit213), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	input_dev = input_allocate_device();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (!touchit213 || !input_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		goto fail1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	touchit213->serio = serio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	touchit213->dev = input_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	snprintf(touchit213->phys, sizeof(touchit213->phys),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		 "%s/input0", serio->phys);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	input_dev->name = "Sahara Touch-iT213 Serial TouchScreen";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	input_dev->phys = touchit213->phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	input_dev->id.bustype = BUS_RS232;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	input_dev->id.vendor = SERIO_TOUCHIT213;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	input_dev->id.product = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	input_dev->id.version = 0x0100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	input_dev->dev.parent = &serio->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	input_set_abs_params(touchit213->dev, ABS_X,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			     T213_MIN_XC, T213_MAX_XC, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	input_set_abs_params(touchit213->dev, ABS_Y,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			     T213_MIN_YC, T213_MAX_YC, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	serio_set_drvdata(serio, touchit213);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	err = serio_open(serio, drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		goto fail2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	err = input_register_device(touchit213->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		goto fail3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  fail3:	serio_close(serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  fail2:	serio_set_drvdata(serio, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  fail1:	input_free_device(input_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	kfree(touchit213);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)  * The serio driver structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) static const struct serio_device_id touchit213_serio_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		.type	= SERIO_RS232,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		.proto	= SERIO_TOUCHIT213,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		.id	= SERIO_ANY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		.extra	= SERIO_ANY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	{ 0 }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) MODULE_DEVICE_TABLE(serio, touchit213_serio_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static struct serio_driver touchit213_drv = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	.driver		= {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		.name	= "touchit213",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	.description	= DRIVER_DESC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	.id_table	= touchit213_serio_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	.interrupt	= touchit213_interrupt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	.connect	= touchit213_connect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	.disconnect	= touchit213_disconnect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) module_serio_driver(touchit213_drv);