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 
22 #include <mach/hardware.h>
23 #include <mach/jornada720.h>
24 
25 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
26 MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
27 MODULE_LICENSE("GPL v2");
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_MASK(EV_KEY) | BIT_MASK(EV_ABS);
123 	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(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 
163 /* work with hotplug and coldplug */
164 MODULE_ALIAS("platform:jornada_ts");
165 
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",
171 		.owner	= THIS_MODULE,
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);
187