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cc7feb7f | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f01536e3 SAS |
2 | /* |
3 | * TSC-40 serial touchscreen driver. It should be compatible with | |
4 | * TSC-10 and 25. | |
5 | * | |
6 | * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> | |
f01536e3 SAS |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/input.h> | |
13 | #include <linux/serio.h> | |
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14 | |
15 | #define PACKET_LENGTH 5 | |
16 | struct tsc_ser { | |
17 | struct input_dev *dev; | |
18 | struct serio *serio; | |
19 | u32 idx; | |
20 | unsigned char data[PACKET_LENGTH]; | |
21 | char phys[32]; | |
22 | }; | |
23 | ||
24 | static void tsc_process_data(struct tsc_ser *ptsc) | |
25 | { | |
26 | struct input_dev *dev = ptsc->dev; | |
27 | u8 *data = ptsc->data; | |
28 | u32 x; | |
29 | u32 y; | |
30 | ||
31 | x = ((data[1] & 0x03) << 8) | data[2]; | |
32 | y = ((data[3] & 0x03) << 8) | data[4]; | |
33 | ||
34 | input_report_abs(dev, ABS_X, x); | |
35 | input_report_abs(dev, ABS_Y, y); | |
36 | input_report_key(dev, BTN_TOUCH, 1); | |
37 | ||
38 | input_sync(dev); | |
39 | } | |
40 | ||
41 | static irqreturn_t tsc_interrupt(struct serio *serio, | |
42 | unsigned char data, unsigned int flags) | |
43 | { | |
44 | struct tsc_ser *ptsc = serio_get_drvdata(serio); | |
45 | struct input_dev *dev = ptsc->dev; | |
46 | ||
47 | ptsc->data[ptsc->idx] = data; | |
48 | switch (ptsc->idx++) { | |
49 | case 0: | |
50 | if (unlikely((data & 0x3e) != 0x10)) { | |
51 | dev_dbg(&serio->dev, | |
52 | "unsynchronized packet start (0x%02x)\n", data); | |
53 | ptsc->idx = 0; | |
54 | } else if (!(data & 0x01)) { | |
55 | input_report_key(dev, BTN_TOUCH, 0); | |
56 | input_sync(dev); | |
57 | ptsc->idx = 0; | |
58 | } | |
59 | break; | |
60 | ||
61 | case 1: | |
62 | case 3: | |
63 | if (unlikely(data & 0xfc)) { | |
64 | dev_dbg(&serio->dev, | |
65 | "unsynchronized data 0x%02x at offset %d\n", | |
66 | data, ptsc->idx - 1); | |
67 | ptsc->idx = 0; | |
68 | } | |
69 | break; | |
70 | ||
71 | case 4: | |
72 | tsc_process_data(ptsc); | |
73 | ptsc->idx = 0; | |
74 | break; | |
75 | } | |
76 | ||
77 | return IRQ_HANDLED; | |
78 | } | |
79 | ||
80 | static int tsc_connect(struct serio *serio, struct serio_driver *drv) | |
81 | { | |
82 | struct tsc_ser *ptsc; | |
83 | struct input_dev *input_dev; | |
84 | int error; | |
85 | ||
86 | ptsc = kzalloc(sizeof(struct tsc_ser), GFP_KERNEL); | |
87 | input_dev = input_allocate_device(); | |
88 | if (!ptsc || !input_dev) { | |
89 | error = -ENOMEM; | |
90 | goto fail1; | |
91 | } | |
92 | ||
93 | ptsc->serio = serio; | |
94 | ptsc->dev = input_dev; | |
95 | snprintf(ptsc->phys, sizeof(ptsc->phys), "%s/input0", serio->phys); | |
96 | ||
97 | input_dev->name = "TSC-10/25/40 Serial TouchScreen"; | |
98 | input_dev->phys = ptsc->phys; | |
99 | input_dev->id.bustype = BUS_RS232; | |
100 | input_dev->id.vendor = SERIO_TSC40; | |
101 | input_dev->id.product = 40; | |
102 | input_dev->id.version = 0x0001; | |
103 | input_dev->dev.parent = &serio->dev; | |
104 | ||
105 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
106 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
107 | input_set_abs_params(ptsc->dev, ABS_X, 0, 0x3ff, 0, 0); | |
108 | input_set_abs_params(ptsc->dev, ABS_Y, 0, 0x3ff, 0, 0); | |
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109 | |
110 | serio_set_drvdata(serio, ptsc); | |
111 | ||
112 | error = serio_open(serio, drv); | |
113 | if (error) | |
114 | goto fail2; | |
115 | ||
116 | error = input_register_device(ptsc->dev); | |
117 | if (error) | |
118 | goto fail3; | |
119 | ||
120 | return 0; | |
121 | ||
122 | fail3: | |
123 | serio_close(serio); | |
124 | fail2: | |
125 | serio_set_drvdata(serio, NULL); | |
126 | fail1: | |
127 | input_free_device(input_dev); | |
128 | kfree(ptsc); | |
129 | return error; | |
130 | } | |
131 | ||
132 | static void tsc_disconnect(struct serio *serio) | |
133 | { | |
134 | struct tsc_ser *ptsc = serio_get_drvdata(serio); | |
135 | ||
136 | serio_close(serio); | |
137 | ||
138 | input_unregister_device(ptsc->dev); | |
139 | kfree(ptsc); | |
140 | ||
141 | serio_set_drvdata(serio, NULL); | |
142 | } | |
143 | ||
57952335 | 144 | static const struct serio_device_id tsc_serio_ids[] = { |
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145 | { |
146 | .type = SERIO_RS232, | |
147 | .proto = SERIO_TSC40, | |
148 | .id = SERIO_ANY, | |
149 | .extra = SERIO_ANY, | |
150 | }, | |
151 | { 0 } | |
152 | }; | |
153 | MODULE_DEVICE_TABLE(serio, tsc_serio_ids); | |
154 | ||
155 | #define DRIVER_DESC "TSC-10/25/40 serial touchscreen driver" | |
156 | ||
157 | static struct serio_driver tsc_drv = { | |
158 | .driver = { | |
159 | .name = "tsc40", | |
160 | }, | |
161 | .description = DRIVER_DESC, | |
162 | .id_table = tsc_serio_ids, | |
163 | .interrupt = tsc_interrupt, | |
164 | .connect = tsc_connect, | |
165 | .disconnect = tsc_disconnect, | |
166 | }; | |
167 | ||
65ac9f7a | 168 | module_serio_driver(tsc_drv); |
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169 | |
170 | MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>"); | |
171 | MODULE_DESCRIPTION(DRIVER_DESC); | |
172 | MODULE_LICENSE("GPL v2"); |