1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *
  4 * h3600 atmel micro companion support, touchscreen subdevice
  5 * Author : Alessandro Gardich <gremlin@gremlin.it>
  6 * Author : Dmitry Artamonow <mad_soft@inbox.ru>
  7 * Author : Linus Walleij <linus.walleij@linaro.org>
  8 */
  9
 10#include <asm/byteorder.h>
 11#include <linux/module.h>
 12#include <linux/init.h>
 13#include <linux/interrupt.h>
 14#include <linux/pm.h>
 15#include <linux/delay.h>
 16#include <linux/device.h>
 17#include <linux/input.h>
 18#include <linux/platform_device.h>
 19#include <linux/slab.h>
 20#include <linux/mfd/ipaq-micro.h>
 21
 22struct touchscreen_data {
 23	struct input_dev *input;
 24	struct ipaq_micro *micro;
 25};
 26
 27static void micro_ts_receive(void *data, int len, unsigned char *msg)
 28{
 29	struct touchscreen_data *ts = data;
 30
 31	if (len == 4) {
 32		input_report_abs(ts->input, ABS_X,
 33				 be16_to_cpup((__be16 *) &msg[2]));
 34		input_report_abs(ts->input, ABS_Y,
 35				 be16_to_cpup((__be16 *) &msg[0]));
 36		input_report_key(ts->input, BTN_TOUCH, 1);
 37		input_sync(ts->input);
 38	} else if (len == 0) {
 39		input_report_abs(ts->input, ABS_X, 0);
 40		input_report_abs(ts->input, ABS_Y, 0);
 41		input_report_key(ts->input, BTN_TOUCH, 0);
 42		input_sync(ts->input);
 43	}
 44}
 45
 46static void micro_ts_toggle_receive(struct touchscreen_data *ts, bool enable)
 47{
 48	struct ipaq_micro *micro = ts->micro;
 49
 50	spin_lock_irq(&micro->lock);
 51
 52	if (enable) {
 53		micro->ts = micro_ts_receive;
 54		micro->ts_data = ts;
 55	} else {
 56		micro->ts = NULL;
 57		micro->ts_data = NULL;
 58	}
 59
 60	spin_unlock_irq(&ts->micro->lock);
 61}
 62
 63static int micro_ts_open(struct input_dev *input)
 64{
 65	struct touchscreen_data *ts = input_get_drvdata(input);
 66
 67	micro_ts_toggle_receive(ts, true);
 68
 69	return 0;
 70}
 71
 72static void micro_ts_close(struct input_dev *input)
 73{
 74	struct touchscreen_data *ts = input_get_drvdata(input);
 75
 76	micro_ts_toggle_receive(ts, false);
 77}
 78
 79static int micro_ts_probe(struct platform_device *pdev)
 80{
 81	struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
 82	struct touchscreen_data *ts;
 83	int error;
 84
 85	ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
 86	if (!ts)
 87		return -ENOMEM;
 88
 89	ts->micro = micro;
 90
 91	ts->input = devm_input_allocate_device(&pdev->dev);
 92	if (!ts->input) {
 93		dev_err(&pdev->dev, "failed to allocate input device\n");
 94		return -ENOMEM;
 95	}
 96
 97	ts->input->name = "ipaq micro ts";
 98	ts->input->open = micro_ts_open;
 99	ts->input->close = micro_ts_close;
100
101	input_set_drvdata(ts->input, ts);
102
103	input_set_capability(ts->input, EV_KEY, BTN_TOUCH);
104	input_set_capability(ts->input, EV_ABS, ABS_X);
105	input_set_capability(ts->input, EV_ABS, ABS_Y);
106	input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0);
107	input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0);
108
109	error = input_register_device(ts->input);
110	if (error) {
111		dev_err(&pdev->dev, "error registering touch input\n");
112		return error;
113	}
114
115	platform_set_drvdata(pdev, ts);
116
117	dev_info(&pdev->dev, "iPAQ micro touchscreen\n");
118
119	return 0;
120}
121
122static int __maybe_unused micro_ts_suspend(struct device *dev)
123{
124	struct touchscreen_data *ts = dev_get_drvdata(dev);
125
126	micro_ts_toggle_receive(ts, false);
127
128	return 0;
129}
130
131static int __maybe_unused micro_ts_resume(struct device *dev)
132{
133	struct touchscreen_data *ts = dev_get_drvdata(dev);
134	struct input_dev *input = ts->input;
135
136	mutex_lock(&input->mutex);
137
138	if (input_device_enabled(input))
139		micro_ts_toggle_receive(ts, true);
140
141	mutex_unlock(&input->mutex);
142
143	return 0;
144}
145
146static const struct dev_pm_ops micro_ts_dev_pm_ops = {
147	SET_SYSTEM_SLEEP_PM_OPS(micro_ts_suspend, micro_ts_resume)
148};
149
150static struct platform_driver micro_ts_device_driver = {
151	.driver	= {
152		.name	= "ipaq-micro-ts",
153		.pm	= &micro_ts_dev_pm_ops,
154	},
155	.probe	= micro_ts_probe,
156};
157module_platform_driver(micro_ts_device_driver);
158
159MODULE_LICENSE("GPL");
160MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");
161MODULE_ALIAS("platform:ipaq-micro-ts");