1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License version 2 as
4 * published by the Free Software Foundation.
5 *
6 * h3600 atmel micro companion support, touchscreen subdevice
7 * Author : Alessandro Gardich <gremlin@gremlin.it>
8 * Author : Dmitry Artamonow <mad_soft@inbox.ru>
9 * Author : Linus Walleij <linus.walleij@linaro.org>
10 *
11 */
12
13#include <asm/byteorder.h>
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/interrupt.h>
17#include <linux/pm.h>
18#include <linux/delay.h>
19#include <linux/device.h>
20#include <linux/input.h>
21#include <linux/platform_device.h>
22#include <linux/slab.h>
23#include <linux/mfd/ipaq-micro.h>
24
25struct touchscreen_data {
26	struct input_dev *input;
27	struct ipaq_micro *micro;
28};
29
30static void micro_ts_receive(void *data, int len, unsigned char *msg)
31{
32	struct touchscreen_data *ts = data;
33
34	if (len == 4) {
35		input_report_abs(ts->input, ABS_X,
36				 be16_to_cpup((__be16 *) &msg[2]));
37		input_report_abs(ts->input, ABS_Y,
38				 be16_to_cpup((__be16 *) &msg[0]));
39		input_report_key(ts->input, BTN_TOUCH, 1);
40		input_sync(ts->input);
41	} else if (len == 0) {
42		input_report_abs(ts->input, ABS_X, 0);
43		input_report_abs(ts->input, ABS_Y, 0);
44		input_report_key(ts->input, BTN_TOUCH, 0);
45		input_sync(ts->input);
46	}
47}
48
49static void micro_ts_toggle_receive(struct touchscreen_data *ts, bool enable)
50{
51	struct ipaq_micro *micro = ts->micro;
52
53	spin_lock_irq(&micro->lock);
54
55	if (enable) {
56		micro->ts = micro_ts_receive;
57		micro->ts_data = ts;
58	} else {
59		micro->ts = NULL;
60		micro->ts_data = NULL;
61	}
62
63	spin_unlock_irq(&ts->micro->lock);
64}
65
66static int micro_ts_open(struct input_dev *input)
67{
68	struct touchscreen_data *ts = input_get_drvdata(input);
69
70	micro_ts_toggle_receive(ts, true);
71
72	return 0;
73}
74
75static void micro_ts_close(struct input_dev *input)
76{
77	struct touchscreen_data *ts = input_get_drvdata(input);
78
79	micro_ts_toggle_receive(ts, false);
80}
81
82static int micro_ts_probe(struct platform_device *pdev)
83{
84	struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
85	struct touchscreen_data *ts;
86	int error;
87
88	ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
89	if (!ts)
90		return -ENOMEM;
91
92	ts->micro = micro;
93
94	ts->input = devm_input_allocate_device(&pdev->dev);
95	if (!ts->input) {
96		dev_err(&pdev->dev, "failed to allocate input device\n");
97		return -ENOMEM;
98	}
99
100	ts->input->name = "ipaq micro ts";
101	ts->input->open = micro_ts_open;
102	ts->input->close = micro_ts_close;
103
104	input_set_drvdata(ts->input, ts);
105
106	input_set_capability(ts->input, EV_KEY, BTN_TOUCH);
107	input_set_capability(ts->input, EV_ABS, ABS_X);
108	input_set_capability(ts->input, EV_ABS, ABS_Y);
109	input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0);
110	input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0);
111
112	error = input_register_device(ts->input);
113	if (error) {
114		dev_err(&pdev->dev, "error registering touch input\n");
115		return error;
116	}
117
118	platform_set_drvdata(pdev, ts);
119
120	dev_info(&pdev->dev, "iPAQ micro touchscreen\n");
121
122	return 0;
123}
124
125static int __maybe_unused micro_ts_suspend(struct device *dev)
126{
127	struct touchscreen_data *ts = dev_get_drvdata(dev);
128
129	micro_ts_toggle_receive(ts, false);
130
131	return 0;
132}
133
134static int __maybe_unused micro_ts_resume(struct device *dev)
135{
136	struct touchscreen_data *ts = dev_get_drvdata(dev);
137	struct input_dev *input = ts->input;
138
139	mutex_lock(&input->mutex);
140
141	if (input->users)
142		micro_ts_toggle_receive(ts, true);
143
144	mutex_unlock(&input->mutex);
145
146	return 0;
147}
148
149static const struct dev_pm_ops micro_ts_dev_pm_ops = {
150	SET_SYSTEM_SLEEP_PM_OPS(micro_ts_suspend, micro_ts_resume)
151};
152
153static struct platform_driver micro_ts_device_driver = {
154	.driver	= {
155		.name	= "ipaq-micro-ts",
156		.pm	= &micro_ts_dev_pm_ops,
157	},
158	.probe	= micro_ts_probe,
159};
160module_platform_driver(micro_ts_device_driver);
161
162MODULE_LICENSE("GPL");
163MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");
164MODULE_ALIAS("platform:ipaq-micro-ts");
165