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
22 struct touchscreen_data {
23 struct input_dev *input;
24 struct ipaq_micro *micro;
25 };
26
micro_ts_receive(void * data,int len,unsigned char * msg)27 static 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
micro_ts_toggle_receive(struct touchscreen_data * ts,bool enable)46 static void micro_ts_toggle_receive(struct touchscreen_data *ts, bool enable)
47 {
48 struct ipaq_micro *micro = ts->micro;
49
50 spin_lock_irq(µ->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
micro_ts_open(struct input_dev * input)63 static 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
micro_ts_close(struct input_dev * input)72 static 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
micro_ts_probe(struct platform_device * pdev)79 static 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
micro_ts_suspend(struct device * dev)122 static 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
micro_ts_resume(struct device * dev)131 static 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
146 static DEFINE_SIMPLE_DEV_PM_OPS(micro_ts_dev_pm_ops,
147 micro_ts_suspend, micro_ts_resume);
148
149 static struct platform_driver micro_ts_device_driver = {
150 .driver = {
151 .name = "ipaq-micro-ts",
152 .pm = pm_sleep_ptr(µ_ts_dev_pm_ops),
153 },
154 .probe = micro_ts_probe,
155 };
156 module_platform_driver(micro_ts_device_driver);
157
158 MODULE_LICENSE("GPL");
159 MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");
160 MODULE_ALIAS("platform:ipaq-micro-ts");
161