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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         /* 3 low word X samples */
 40         jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
 41         jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
 42         jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
 43 
 44         /* 3 low word Y samples */
 45         jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
 46         jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
 47         jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
 48 
 49         /* combined x samples bits */
 50         jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
 51 
 52         /* combined y samples bits */
 53         jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
 54 }
 55 
 56 static int jornada720_ts_average(int coords[4])
 57 {
 58         int coord, high_bits = coords[3];
 59 
 60         coord  = coords[0] | ((high_bits & 0x03) << 8);
 61         coord += coords[1] | ((high_bits & 0x0c) << 6);
 62         coord += coords[2] | ((high_bits & 0x30) << 4);
 63 
 64         return coord / 3;
 65 }
 66 
 67 static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
 68 {
 69         struct platform_device *pdev = dev_id;
 70         struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
 71         struct input_dev *input = jornada_ts->dev;
 72         int x, y;
 73 
 74         /* If GPIO_GPIO9 is set to high then report pen up */
 75         if (GPLR & GPIO_GPIO(9)) {
 76                 input_report_key(input, BTN_TOUCH, 0);
 77                 input_sync(input);
 78         } else {
 79                 jornada_ssp_start();
 80 
 81                 /* proper reply to request is always TXDUMMY */
 82                 if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
 83                         jornada720_ts_collect_data(jornada_ts);
 84 
 85                         x = jornada720_ts_average(jornada_ts->x_data);
 86                         y = jornada720_ts_average(jornada_ts->y_data);
 87 
 88                         input_report_key(input, BTN_TOUCH, 1);
 89                         input_report_abs(input, ABS_X, x);
 90                         input_report_abs(input, ABS_Y, y);
 91                         input_sync(input);
 92                 }
 93 
 94                 jornada_ssp_end();
 95         }
 96 
 97         return IRQ_HANDLED;
 98 }
 99 
100 static int jornada720_ts_probe(struct platform_device *pdev)
101 {
102         struct jornada_ts *jornada_ts;
103         struct input_dev *input_dev;
104         int error;
105 
106         jornada_ts = devm_kzalloc(&pdev->dev, sizeof(*jornada_ts), GFP_KERNEL);
107         if (!jornada_ts)
108                 return -ENOMEM;
109 
110         input_dev = devm_input_allocate_device(&pdev->dev);
111         if (!input_dev)
112                 return -ENOMEM;
113 
114         platform_set_drvdata(pdev, jornada_ts);
115 
116         jornada_ts->dev = input_dev;
117 
118         input_dev->name = "HP Jornada 7xx Touchscreen";
119         input_dev->phys = "jornadats/input0";
120         input_dev->id.bustype = BUS_HOST;
121         input_dev->dev.parent = &pdev->dev;
122 
123         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
124         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
125         input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
126         input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
127 
128         error = devm_request_irq(&pdev->dev, IRQ_GPIO9,
129                                  jornada720_ts_interrupt,
130                                  IRQF_TRIGGER_RISING,
131                                  "HP7XX Touchscreen driver", pdev);
132         if (error) {
133                 dev_err(&pdev->dev, "HP7XX TS : Unable to acquire irq!\n");
134                 return error;
135         }
136 
137         error = input_register_device(jornada_ts->dev);
138         if (error)
139                 return error;
140 
141         return 0;
142 }
143 
144 /* work with hotplug and coldplug */
145 MODULE_ALIAS("platform:jornada_ts");
146 
147 static struct platform_driver jornada720_ts_driver = {
148         .probe          = jornada720_ts_probe,
149         .driver         = {
150                 .name   = "jornada_ts",
151                 .owner  = THIS_MODULE,
152         },
153 };
154 module_platform_driver(jornada720_ts_driver);
155 

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