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ee479999 RK |
1 | /* |
2 | * Penmount serial touchscreen driver | |
3 | * | |
4 | * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com> | |
5 | * | |
6 | * Based on ELO driver (drivers/input/touchscreen/elo.c) | |
7 | * Copyright (c) 2004 Vojtech Pavlik | |
8 | */ | |
9 | ||
10 | /* | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License version 2 as published | |
13 | * by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/errno.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/input.h> | |
21 | #include <linux/serio.h> | |
22 | #include <linux/init.h> | |
23 | ||
24 | #define DRIVER_DESC "Penmount serial touchscreen driver" | |
25 | ||
26 | MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>"); | |
27 | MODULE_DESCRIPTION(DRIVER_DESC); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
30 | /* | |
31 | * Definitions & global arrays. | |
32 | */ | |
33 | ||
34 | #define PM_MAX_LENGTH 5 | |
35 | ||
36 | /* | |
37 | * Per-touchscreen data. | |
38 | */ | |
39 | ||
40 | struct pm { | |
41 | struct input_dev *dev; | |
42 | struct serio *serio; | |
43 | int idx; | |
44 | unsigned char data[PM_MAX_LENGTH]; | |
45 | char phys[32]; | |
46 | }; | |
47 | ||
48 | static irqreturn_t pm_interrupt(struct serio *serio, | |
7d12e780 | 49 | unsigned char data, unsigned int flags) |
ee479999 RK |
50 | { |
51 | struct pm *pm = serio_get_drvdata(serio); | |
52 | struct input_dev *dev = pm->dev; | |
53 | ||
54 | pm->data[pm->idx] = data; | |
55 | ||
56 | if (pm->data[0] & 0x80) { | |
57 | if (PM_MAX_LENGTH == ++pm->idx) { | |
ee479999 RK |
58 | input_report_abs(dev, ABS_X, pm->data[2] * 128 + pm->data[1]); |
59 | input_report_abs(dev, ABS_Y, pm->data[4] * 128 + pm->data[3]); | |
60 | input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40)); | |
61 | input_sync(dev); | |
62 | pm->idx = 0; | |
63 | } | |
64 | } | |
65 | ||
66 | return IRQ_HANDLED; | |
67 | } | |
68 | ||
69 | /* | |
70 | * pm_disconnect() is the opposite of pm_connect() | |
71 | */ | |
72 | ||
73 | static void pm_disconnect(struct serio *serio) | |
74 | { | |
75 | struct pm *pm = serio_get_drvdata(serio); | |
76 | ||
77 | input_get_device(pm->dev); | |
78 | input_unregister_device(pm->dev); | |
79 | serio_close(serio); | |
80 | serio_set_drvdata(serio, NULL); | |
81 | input_put_device(pm->dev); | |
82 | kfree(pm); | |
83 | } | |
84 | ||
85 | /* | |
86 | * pm_connect() is the routine that is called when someone adds a | |
87 | * new serio device that supports Gunze protocol and registers it as | |
88 | * an input device. | |
89 | */ | |
90 | ||
91 | static int pm_connect(struct serio *serio, struct serio_driver *drv) | |
92 | { | |
93 | struct pm *pm; | |
94 | struct input_dev *input_dev; | |
95 | int err; | |
96 | ||
97 | pm = kzalloc(sizeof(struct pm), GFP_KERNEL); | |
98 | input_dev = input_allocate_device(); | |
99 | if (!pm || !input_dev) { | |
100 | err = -ENOMEM; | |
101 | goto fail1; | |
102 | } | |
103 | ||
104 | pm->serio = serio; | |
105 | pm->dev = input_dev; | |
106 | snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys); | |
107 | ||
ee479999 RK |
108 | input_dev->name = "Penmount Serial TouchScreen"; |
109 | input_dev->phys = pm->phys; | |
110 | input_dev->id.bustype = BUS_RS232; | |
111 | input_dev->id.vendor = SERIO_PENMOUNT; | |
112 | input_dev->id.product = 0; | |
113 | input_dev->id.version = 0x0100; | |
a5394fb0 | 114 | input_dev->dev.parent = &serio->dev; |
ee479999 | 115 | |
7b19ada2 JS |
116 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
117 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
ee479999 RK |
118 | input_set_abs_params(pm->dev, ABS_X, 0, 0x3ff, 0, 0); |
119 | input_set_abs_params(pm->dev, ABS_Y, 0, 0x3ff, 0, 0); | |
120 | ||
121 | serio_set_drvdata(serio, pm); | |
122 | ||
123 | err = serio_open(serio, drv); | |
124 | if (err) | |
125 | goto fail2; | |
126 | ||
127 | err = input_register_device(pm->dev); | |
128 | if (err) | |
129 | goto fail3; | |
130 | ||
131 | return 0; | |
132 | ||
133 | fail3: serio_close(serio); | |
134 | fail2: serio_set_drvdata(serio, NULL); | |
135 | fail1: input_free_device(input_dev); | |
136 | kfree(pm); | |
137 | return err; | |
138 | } | |
139 | ||
140 | /* | |
141 | * The serio driver structure. | |
142 | */ | |
143 | ||
144 | static struct serio_device_id pm_serio_ids[] = { | |
145 | { | |
146 | .type = SERIO_RS232, | |
147 | .proto = SERIO_PENMOUNT, | |
148 | .id = SERIO_ANY, | |
149 | .extra = SERIO_ANY, | |
150 | }, | |
151 | { 0 } | |
152 | }; | |
153 | ||
154 | MODULE_DEVICE_TABLE(serio, pm_serio_ids); | |
155 | ||
156 | static struct serio_driver pm_drv = { | |
157 | .driver = { | |
158 | .name = "penmountlpc", | |
159 | }, | |
160 | .description = DRIVER_DESC, | |
161 | .id_table = pm_serio_ids, | |
162 | .interrupt = pm_interrupt, | |
163 | .connect = pm_connect, | |
164 | .disconnect = pm_disconnect, | |
165 | }; | |
166 | ||
167 | /* | |
168 | * The functions for inserting/removing us as a module. | |
169 | */ | |
170 | ||
171 | static int __init pm_init(void) | |
172 | { | |
153a9df0 | 173 | return serio_register_driver(&pm_drv); |
ee479999 RK |
174 | } |
175 | ||
176 | static void __exit pm_exit(void) | |
177 | { | |
178 | serio_unregister_driver(&pm_drv); | |
179 | } | |
180 | ||
181 | module_init(pm_init); | |
182 | module_exit(pm_exit); |