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 
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 
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(&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 
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 
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 
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 
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 
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(&micro_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