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Kristoffer Ericson5637f022007-09-26 00:02:56 -04001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Russell King31696632012-06-06 11:42:36 +010022#include <linux/io.h>
Kristoffer Ericson5637f022007-09-26 00:02:56 -040023
Russell Kinga09e64f2008-08-05 16:14:15 +010024#include <mach/hardware.h>
25#include <mach/jornada720.h>
Rob Herring3638dd22012-02-23 14:28:36 +010026#include <mach/irqs.h>
Kristoffer Ericson5637f022007-09-26 00:02:56 -040027
28MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
29MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
Al Viro839cd312008-05-21 06:32:11 +010030MODULE_LICENSE("GPL v2");
Kristoffer Ericson5637f022007-09-26 00:02:56 -040031
32struct jornada_ts {
33 struct input_dev *dev;
34 int x_data[4]; /* X sample values */
35 int y_data[4]; /* Y sample values */
36};
37
38static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
39{
40
41 /* 3 low word X samples */
42 jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
43 jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
44 jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
45
46 /* 3 low word Y samples */
47 jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
48 jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
49 jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
50
51 /* combined x samples bits */
52 jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
53
54 /* combined y samples bits */
55 jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
56}
57
58static int jornada720_ts_average(int coords[4])
59{
60 int coord, high_bits = coords[3];
61
62 coord = coords[0] | ((high_bits & 0x03) << 8);
63 coord += coords[1] | ((high_bits & 0x0c) << 6);
64 coord += coords[2] | ((high_bits & 0x30) << 4);
65
66 return coord / 3;
67}
68
69static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
70{
71 struct platform_device *pdev = dev_id;
72 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
73 struct input_dev *input = jornada_ts->dev;
74 int x, y;
75
76 /* If GPIO_GPIO9 is set to high then report pen up */
77 if (GPLR & GPIO_GPIO(9)) {
78 input_report_key(input, BTN_TOUCH, 0);
79 input_sync(input);
80 } else {
81 jornada_ssp_start();
82
83 /* proper reply to request is always TXDUMMY */
84 if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
85 jornada720_ts_collect_data(jornada_ts);
86
87 x = jornada720_ts_average(jornada_ts->x_data);
88 y = jornada720_ts_average(jornada_ts->y_data);
89
90 input_report_key(input, BTN_TOUCH, 1);
91 input_report_abs(input, ABS_X, x);
92 input_report_abs(input, ABS_Y, y);
93 input_sync(input);
94 }
95
96 jornada_ssp_end();
97 }
98
99 return IRQ_HANDLED;
100}
101
102static int __devinit jornada720_ts_probe(struct platform_device *pdev)
103{
104 struct jornada_ts *jornada_ts;
105 struct input_dev *input_dev;
106 int error;
107
108 jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL);
109 input_dev = input_allocate_device();
110
111 if (!jornada_ts || !input_dev) {
112 error = -ENOMEM;
113 goto fail1;
114 }
115
116 platform_set_drvdata(pdev, jornada_ts);
117
118 jornada_ts->dev = input_dev;
119
120 input_dev->name = "HP Jornada 7xx Touchscreen";
121 input_dev->phys = "jornadats/input0";
122 input_dev->id.bustype = BUS_HOST;
123 input_dev->dev.parent = &pdev->dev;
124
Kristoffer Ericson1577e4b2008-09-16 14:19:25 -0400125 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
126 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
Kristoffer Ericson5637f022007-09-26 00:02:56 -0400127 input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
128 input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
129
130 error = request_irq(IRQ_GPIO9,
131 jornada720_ts_interrupt,
Yong Zhangec4665c2011-09-07 14:04:16 -0700132 IRQF_TRIGGER_RISING,
Kristoffer Ericson5637f022007-09-26 00:02:56 -0400133 "HP7XX Touchscreen driver", pdev);
134 if (error) {
135 printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n");
136 goto fail1;
137 }
138
139 error = input_register_device(jornada_ts->dev);
140 if (error)
141 goto fail2;
142
143 return 0;
144
145 fail2:
146 free_irq(IRQ_GPIO9, pdev);
147 fail1:
148 platform_set_drvdata(pdev, NULL);
149 input_free_device(input_dev);
150 kfree(jornada_ts);
151 return error;
152}
153
154static int __devexit jornada720_ts_remove(struct platform_device *pdev)
155{
156 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
157
158 free_irq(IRQ_GPIO9, pdev);
159 platform_set_drvdata(pdev, NULL);
160 input_unregister_device(jornada_ts->dev);
161 kfree(jornada_ts);
162
163 return 0;
164}
165
Kay Sieversd7b52472008-04-18 00:24:42 -0400166/* work with hotplug and coldplug */
167MODULE_ALIAS("platform:jornada_ts");
168
Kristoffer Ericson5637f022007-09-26 00:02:56 -0400169static struct platform_driver jornada720_ts_driver = {
170 .probe = jornada720_ts_probe,
171 .remove = __devexit_p(jornada720_ts_remove),
172 .driver = {
173 .name = "jornada_ts",
Kay Sieversd7b52472008-04-18 00:24:42 -0400174 .owner = THIS_MODULE,
Kristoffer Ericson5637f022007-09-26 00:02:56 -0400175 },
176};
JJ Dingcdcc96e2011-11-29 11:14:13 -0800177module_platform_driver(jornada720_ts_driver);