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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(µ->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 = µ_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
