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 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 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 DEFINE_SIMPLE_DEV_PM_OPS(micro_ts_dev_pm_ops,
147				micro_ts_suspend, micro_ts_resume);
148
149static struct platform_driver micro_ts_device_driver = {
150	.driver	= {
151		.name	= "ipaq-micro-ts",
152		.pm	= pm_sleep_ptr(&micro_ts_dev_pm_ops),
153	},
154	.probe	= micro_ts_probe,
155};
156module_platform_driver(micro_ts_device_driver);
157
158MODULE_LICENSE("GPL");
159MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");
160MODULE_ALIAS("platform:ipaq-micro-ts");
161