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5637f02a KE |
1 | /* |
2 | * drivers/input/touchscreen/jornada720_ts.c | |
3 | * | |
4 | * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com> | |
5 | * | |
6 | * Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl> | |
7 | * based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * HP Jornada 710/720/729 Touchscreen Driver | |
14 | */ | |
15 | ||
16 | #include <linux/platform_device.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/input.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/module.h> | |
21 | ||
be509729 | 22 | #include <asm/arch/hardware.h> |
5637f02a KE |
23 | #include <asm/arch/jornada720.h> |
24 | ||
25 | MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); | |
26 | MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver"); | |
839cd310 | 27 | MODULE_LICENSE("GPL v2"); |
5637f02a KE |
28 | |
29 | struct jornada_ts { | |
30 | struct input_dev *dev; | |
31 | int x_data[4]; /* X sample values */ | |
32 | int y_data[4]; /* Y sample values */ | |
33 | }; | |
34 | ||
35 | static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts) | |
36 | { | |
37 | ||
38 | /* 3 low word X samples */ | |
39 | jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY); | |
40 | jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY); | |
41 | jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY); | |
42 | ||
43 | /* 3 low word Y samples */ | |
44 | jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY); | |
45 | jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY); | |
46 | jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY); | |
47 | ||
48 | /* combined x samples bits */ | |
49 | jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY); | |
50 | ||
51 | /* combined y samples bits */ | |
52 | jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY); | |
53 | } | |
54 | ||
55 | static int jornada720_ts_average(int coords[4]) | |
56 | { | |
57 | int coord, high_bits = coords[3]; | |
58 | ||
59 | coord = coords[0] | ((high_bits & 0x03) << 8); | |
60 | coord += coords[1] | ((high_bits & 0x0c) << 6); | |
61 | coord += coords[2] | ((high_bits & 0x30) << 4); | |
62 | ||
63 | return coord / 3; | |
64 | } | |
65 | ||
66 | static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id) | |
67 | { | |
68 | struct platform_device *pdev = dev_id; | |
69 | struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); | |
70 | struct input_dev *input = jornada_ts->dev; | |
71 | int x, y; | |
72 | ||
73 | /* If GPIO_GPIO9 is set to high then report pen up */ | |
74 | if (GPLR & GPIO_GPIO(9)) { | |
75 | input_report_key(input, BTN_TOUCH, 0); | |
76 | input_sync(input); | |
77 | } else { | |
78 | jornada_ssp_start(); | |
79 | ||
80 | /* proper reply to request is always TXDUMMY */ | |
81 | if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) { | |
82 | jornada720_ts_collect_data(jornada_ts); | |
83 | ||
84 | x = jornada720_ts_average(jornada_ts->x_data); | |
85 | y = jornada720_ts_average(jornada_ts->y_data); | |
86 | ||
87 | input_report_key(input, BTN_TOUCH, 1); | |
88 | input_report_abs(input, ABS_X, x); | |
89 | input_report_abs(input, ABS_Y, y); | |
90 | input_sync(input); | |
91 | } | |
92 | ||
93 | jornada_ssp_end(); | |
94 | } | |
95 | ||
96 | return IRQ_HANDLED; | |
97 | } | |
98 | ||
99 | static int __devinit jornada720_ts_probe(struct platform_device *pdev) | |
100 | { | |
101 | struct jornada_ts *jornada_ts; | |
102 | struct input_dev *input_dev; | |
103 | int error; | |
104 | ||
105 | jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL); | |
106 | input_dev = input_allocate_device(); | |
107 | ||
108 | if (!jornada_ts || !input_dev) { | |
109 | error = -ENOMEM; | |
110 | goto fail1; | |
111 | } | |
112 | ||
113 | platform_set_drvdata(pdev, jornada_ts); | |
114 | ||
115 | jornada_ts->dev = input_dev; | |
116 | ||
117 | input_dev->name = "HP Jornada 7xx Touchscreen"; | |
118 | input_dev->phys = "jornadats/input0"; | |
119 | input_dev->id.bustype = BUS_HOST; | |
120 | input_dev->dev.parent = &pdev->dev; | |
121 | ||
122 | input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); | |
123 | input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); | |
124 | input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0); | |
125 | input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0); | |
126 | ||
127 | error = request_irq(IRQ_GPIO9, | |
128 | jornada720_ts_interrupt, | |
129 | IRQF_DISABLED | IRQF_TRIGGER_RISING, | |
130 | "HP7XX Touchscreen driver", pdev); | |
131 | if (error) { | |
132 | printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n"); | |
133 | goto fail1; | |
134 | } | |
135 | ||
136 | error = input_register_device(jornada_ts->dev); | |
137 | if (error) | |
138 | goto fail2; | |
139 | ||
140 | return 0; | |
141 | ||
142 | fail2: | |
143 | free_irq(IRQ_GPIO9, pdev); | |
144 | fail1: | |
145 | platform_set_drvdata(pdev, NULL); | |
146 | input_free_device(input_dev); | |
147 | kfree(jornada_ts); | |
148 | return error; | |
149 | } | |
150 | ||
151 | static int __devexit jornada720_ts_remove(struct platform_device *pdev) | |
152 | { | |
153 | struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); | |
154 | ||
155 | free_irq(IRQ_GPIO9, pdev); | |
156 | platform_set_drvdata(pdev, NULL); | |
157 | input_unregister_device(jornada_ts->dev); | |
158 | kfree(jornada_ts); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
d7b5247b KS |
163 | /* work with hotplug and coldplug */ |
164 | MODULE_ALIAS("platform:jornada_ts"); | |
165 | ||
5637f02a KE |
166 | static struct platform_driver jornada720_ts_driver = { |
167 | .probe = jornada720_ts_probe, | |
168 | .remove = __devexit_p(jornada720_ts_remove), | |
169 | .driver = { | |
170 | .name = "jornada_ts", | |
d7b5247b | 171 | .owner = THIS_MODULE, |
5637f02a KE |
172 | }, |
173 | }; | |
174 | ||
175 | static int __init jornada720_ts_init(void) | |
176 | { | |
177 | return platform_driver_register(&jornada720_ts_driver); | |
178 | } | |
179 | ||
180 | static void __exit jornada720_ts_exit(void) | |
181 | { | |
182 | platform_driver_unregister(&jornada720_ts_driver); | |
183 | } | |
184 | ||
185 | module_init(jornada720_ts_init); | |
186 | module_exit(jornada720_ts_exit); |