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156 lines · 3.6 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * h3600 atmel micro companion support, touchscreen subdevice
5 * Author : Alessandro Gardich <[email protected]>
6 * Author : Dmitry Artamonow <[email protected]>
7 * Author : Linus Walleij <[email protected]>
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 guard(spinlock_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
61static int micro_ts_open(struct input_dev *input)
62{
63 struct touchscreen_data *ts = input_get_drvdata(input);
64
65 micro_ts_toggle_receive(ts, true);
66
67 return 0;
68}
69
70static void micro_ts_close(struct input_dev *input)
71{
72 struct touchscreen_data *ts = input_get_drvdata(input);
73
74 micro_ts_toggle_receive(ts, false);
75}
76
77static int micro_ts_probe(struct platform_device *pdev)
78{
79 struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
80 struct touchscreen_data *ts;
81 int error;
82
83 ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
84 if (!ts)
85 return -ENOMEM;
86
87 ts->micro = micro;
88
89 ts->input = devm_input_allocate_device(&pdev->dev);
90 if (!ts->input) {
91 dev_err(&pdev->dev, "failed to allocate input device\n");
92 return -ENOMEM;
93 }
94
95 ts->input->name = "ipaq micro ts";
96 ts->input->open = micro_ts_open;
97 ts->input->close = micro_ts_close;
98
99 input_set_drvdata(ts->input, ts);
100
101 input_set_capability(ts->input, EV_KEY, BTN_TOUCH);
102 input_set_capability(ts->input, EV_ABS, ABS_X);
103 input_set_capability(ts->input, EV_ABS, ABS_Y);
104 input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0);
105 input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0);
106
107 error = input_register_device(ts->input);
108 if (error) {
109 dev_err(&pdev->dev, "error registering touch input\n");
110 return error;
111 }
112
113 platform_set_drvdata(pdev, ts);
114
115 dev_info(&pdev->dev, "iPAQ micro touchscreen\n");
116
117 return 0;
118}
119
120static int micro_ts_suspend(struct device *dev)
121{
122 struct touchscreen_data *ts = dev_get_drvdata(dev);
123
124 micro_ts_toggle_receive(ts, false);
125
126 return 0;
127}
128
129static int micro_ts_resume(struct device *dev)
130{
131 struct touchscreen_data *ts = dev_get_drvdata(dev);
132 struct input_dev *input = ts->input;
133
134 guard(mutex)(&input->mutex);
135
136 if (input_device_enabled(input))
137 micro_ts_toggle_receive(ts, true);
138
139 return 0;
140}
141
142static DEFINE_SIMPLE_DEV_PM_OPS(micro_ts_dev_pm_ops,
143 micro_ts_suspend, micro_ts_resume);
144
145static struct platform_driver micro_ts_device_driver = {
146 .driver = {
147 .name = "ipaq-micro-ts",
148 .pm = pm_sleep_ptr(&micro_ts_dev_pm_ops),
149 },
150 .probe = micro_ts_probe,
151};
152module_platform_driver(micro_ts_device_driver);
153
154MODULE_LICENSE("GPL");
155MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");
156MODULE_ALIAS("platform:ipaq-micro-ts");