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/drivers/input/touchscreen/jornada720_ts.c

http://github.com/mirrors/linux
C | 157 lines | 107 code | 32 blank | 18 comment | 10 complexity | 592920cebc06c88a3588b23eb5561717 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * drivers/input/touchscreen/jornada720_ts.c
  4 *
  5 * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
  6 *
  7 *  Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
  8 *  based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org>
  9 *
 10 * HP Jornada 710/720/729 Touchscreen Driver
 11 */
 12
 13#include <linux/gpio/consumer.h>
 14#include <linux/platform_device.h>
 15#include <linux/input.h>
 16#include <linux/interrupt.h>
 17#include <linux/module.h>
 18#include <linux/slab.h>
 19#include <linux/io.h>
 20
 21#include <mach/jornada720.h>
 22
 23MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
 24MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
 25MODULE_LICENSE("GPL v2");
 26
 27struct jornada_ts {
 28	struct input_dev *dev;
 29	struct gpio_desc *gpio;
 30	int x_data[4];		/* X sample values */
 31	int y_data[4];		/* Y sample values */
 32};
 33
 34static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
 35{
 36	/* 3 low word X samples */
 37	jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
 38	jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
 39	jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
 40
 41	/* 3 low word Y samples */
 42	jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
 43	jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
 44	jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
 45
 46	/* combined x samples bits */
 47	jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
 48
 49	/* combined y samples bits */
 50	jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
 51}
 52
 53static int jornada720_ts_average(int coords[4])
 54{
 55	int coord, high_bits = coords[3];
 56
 57	coord  = coords[0] | ((high_bits & 0x03) << 8);
 58	coord += coords[1] | ((high_bits & 0x0c) << 6);
 59	coord += coords[2] | ((high_bits & 0x30) << 4);
 60
 61	return coord / 3;
 62}
 63
 64static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
 65{
 66	struct platform_device *pdev = dev_id;
 67	struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
 68	struct input_dev *input = jornada_ts->dev;
 69	int x, y;
 70
 71	/* If gpio is high then report pen up */
 72	if (gpiod_get_value(jornada_ts->gpio)) {
 73		input_report_key(input, BTN_TOUCH, 0);
 74		input_sync(input);
 75	} else {
 76		jornada_ssp_start();
 77
 78		/* proper reply to request is always TXDUMMY */
 79		if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
 80			jornada720_ts_collect_data(jornada_ts);
 81
 82			x = jornada720_ts_average(jornada_ts->x_data);
 83			y = jornada720_ts_average(jornada_ts->y_data);
 84
 85			input_report_key(input, BTN_TOUCH, 1);
 86			input_report_abs(input, ABS_X, x);
 87			input_report_abs(input, ABS_Y, y);
 88			input_sync(input);
 89		}
 90
 91		jornada_ssp_end();
 92	}
 93
 94	return IRQ_HANDLED;
 95}
 96
 97static int jornada720_ts_probe(struct platform_device *pdev)
 98{
 99	struct jornada_ts *jornada_ts;
100	struct input_dev *input_dev;
101	int error, irq;
102
103	jornada_ts = devm_kzalloc(&pdev->dev, sizeof(*jornada_ts), GFP_KERNEL);
104	if (!jornada_ts)
105		return -ENOMEM;
106
107	input_dev = devm_input_allocate_device(&pdev->dev);
108	if (!input_dev)
109		return -ENOMEM;
110
111	platform_set_drvdata(pdev, jornada_ts);
112
113	jornada_ts->gpio = devm_gpiod_get(&pdev->dev, "penup", GPIOD_IN);
114	if (IS_ERR(jornada_ts->gpio))
115		return PTR_ERR(jornada_ts->gpio);
116
117	irq = gpiod_to_irq(jornada_ts->gpio);
118	if (irq <= 0)
119		return irq < 0 ? irq : -EINVAL;
120
121	jornada_ts->dev = input_dev;
122
123	input_dev->name = "HP Jornada 7xx Touchscreen";
124	input_dev->phys = "jornadats/input0";
125	input_dev->id.bustype = BUS_HOST;
126	input_dev->dev.parent = &pdev->dev;
127
128	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
129	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
130	input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
131	input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
132
133	error = devm_request_irq(&pdev->dev, irq, jornada720_ts_interrupt,
134				 IRQF_TRIGGER_RISING,
135				 "HP7XX Touchscreen driver", pdev);
136	if (error) {
137		dev_err(&pdev->dev, "HP7XX TS : Unable to acquire irq!\n");
138		return error;
139	}
140
141	error = input_register_device(jornada_ts->dev);
142	if (error)
143		return error;
144
145	return 0;
146}
147
148/* work with hotplug and coldplug */
149MODULE_ALIAS("platform:jornada_ts");
150
151static struct platform_driver jornada720_ts_driver = {
152	.probe		= jornada720_ts_probe,
153	.driver		= {
154		.name	= "jornada_ts",
155	},
156};
157module_platform_driver(jornada720_ts_driver);