Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/input/touchscreen/jornada720_ts.c

  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/input.h>
 18 #include <linux/interrupt.h>
 19 #include <linux/module.h>
 20 #include <linux/slab.h>
 21 #include <linux/io.h>
 22 
 23 #include <mach/hardware.h>
 24 #include <mach/jornada720.h>
 25 #include <mach/irqs.h>
 26 
 27 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
 28 MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
 29 MODULE_LICENSE("GPL v2");
 30 
 31 struct jornada_ts {
 32         struct input_dev *dev;
 33         int x_data[4];          /* X sample values */
 34         int y_data[4];          /* Y sample values */
 35 };
 36 
 37 static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
 38 {
 39 
 40     /* 3 low word X samples */
 41     jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
 42     jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
 43     jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
 44 
 45     /* 3 low word Y samples */
 46     jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
 47     jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
 48     jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
 49 
 50     /* combined x samples bits */
 51     jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
 52 
 53     /* combined y samples bits */
 54     jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
 55 }
 56 
 57 static int jornada720_ts_average(int coords[4])
 58 {
 59         int coord, high_bits = coords[3];
 60 
 61         coord  = coords[0] | ((high_bits & 0x03) << 8);
 62         coord += coords[1] | ((high_bits & 0x0c) << 6);
 63         coord += coords[2] | ((high_bits & 0x30) << 4);
 64 
 65         return coord / 3;
 66 }
 67 
 68 static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
 69 {
 70         struct platform_device *pdev = dev_id;
 71         struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
 72         struct input_dev *input = jornada_ts->dev;
 73         int x, y;
 74 
 75         /* If GPIO_GPIO9 is set to high then report pen up */
 76         if (GPLR & GPIO_GPIO(9)) {
 77                 input_report_key(input, BTN_TOUCH, 0);
 78                 input_sync(input);
 79         } else {
 80                 jornada_ssp_start();
 81 
 82                 /* proper reply to request is always TXDUMMY */
 83                 if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
 84                         jornada720_ts_collect_data(jornada_ts);
 85 
 86                         x = jornada720_ts_average(jornada_ts->x_data);
 87                         y = jornada720_ts_average(jornada_ts->y_data);
 88 
 89                         input_report_key(input, BTN_TOUCH, 1);
 90                         input_report_abs(input, ABS_X, x);
 91                         input_report_abs(input, ABS_Y, y);
 92                         input_sync(input);
 93                 }
 94 
 95                 jornada_ssp_end();
 96         }
 97 
 98         return IRQ_HANDLED;
 99 }
100 
101 static int jornada720_ts_probe(struct platform_device *pdev)
102 {
103         struct jornada_ts *jornada_ts;
104         struct input_dev *input_dev;
105         int error;
106 
107         jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL);
108         input_dev = input_allocate_device();
109 
110         if (!jornada_ts || !input_dev) {
111                 error = -ENOMEM;
112                 goto fail1;
113         }
114 
115         platform_set_drvdata(pdev, jornada_ts);
116 
117         jornada_ts->dev = input_dev;
118 
119         input_dev->name = "HP Jornada 7xx Touchscreen";
120         input_dev->phys = "jornadats/input0";
121         input_dev->id.bustype = BUS_HOST;
122         input_dev->dev.parent = &pdev->dev;
123 
124         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
125         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
126         input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
127         input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
128 
129         error = request_irq(IRQ_GPIO9,
130                         jornada720_ts_interrupt,
131                         IRQF_TRIGGER_RISING,
132                         "HP7XX Touchscreen driver", pdev);
133         if (error) {
134                 printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n");
135                 goto fail1;
136         }
137 
138         error = input_register_device(jornada_ts->dev);
139         if (error)
140                 goto fail2;
141 
142         return 0;
143 
144  fail2:
145         free_irq(IRQ_GPIO9, pdev);
146  fail1:
147         input_free_device(input_dev);
148         kfree(jornada_ts);
149         return error;
150 }
151 
152 static int jornada720_ts_remove(struct platform_device *pdev)
153 {
154         struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
155 
156         free_irq(IRQ_GPIO9, pdev);
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         = jornada720_ts_remove,
169         .driver         = {
170                 .name   = "jornada_ts",
171                 .owner  = THIS_MODULE,
172         },
173 };
174 module_platform_driver(jornada720_ts_driver);
175 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us