drivers/input/touchscreen/htcpen.c

   1 /*
   2  * HTC Shift touchscreen driver
   3  *
   4  * Copyright (C) 2008 Pau Oliva Fora <pof@eslack.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation.
   9  */
  10
  11 #include <linux/errno.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/input.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/io.h>
  17 #include <linux/init.h>
  18 #include <linux/irq.h>
  19 #include <linux/isa.h>
  20 #include <linux/ioport.h>
  21 #include <linux/dmi.h>
  22
  23 MODULE_AUTHOR("Pau Oliva Fora <pau@eslack.org>");
  24 MODULE_DESCRIPTION("HTC Shift touchscreen driver");
  25 MODULE_LICENSE("GPL");
  26
  27 #define HTCPEN_PORT_IRQ_CLEAR   0x068
  28 #define HTCPEN_PORT_INIT        0x06c
  29 #define HTCPEN_PORT_INDEX       0x0250
  30 #define HTCPEN_PORT_DATA        0x0251
  31 #define HTCPEN_IRQ              3
  32
  33 #define DEVICE_ENABLE           0xa2
  34 #define DEVICE_DISABLE          0xa3
  35
  36 #define X_INDEX                 3
  37 #define Y_INDEX                 5
  38 #define TOUCH_INDEX             0xb
  39 #define LSB_XY_INDEX            0xc
  40 #define X_AXIS_MAX              2040
  41 #define Y_AXIS_MAX              2040
  42
  43 static bool invert_x;
  44 module_param(invert_x, bool, 0644);
  45 MODULE_PARM_DESC(invert_x, "If set, X axis is inverted");
  46 static bool invert_y;
  47 module_param(invert_y, bool, 0644);
  48 MODULE_PARM_DESC(invert_y, "If set, Y axis is inverted");
  49
  50 static irqreturn_t htcpen_interrupt(int irq, void *handle)
  51 {
  52         struct input_dev *htcpen_dev = handle;
  53         unsigned short x, y, xy;
  54
  55         /* 0 = press; 1 = release */
  56         outb_p(TOUCH_INDEX, HTCPEN_PORT_INDEX);
  57
  58         if (inb_p(HTCPEN_PORT_DATA)) {
  59                 input_report_key(htcpen_dev, BTN_TOUCH, 0);
  60         } else {
  61                 outb_p(X_INDEX, HTCPEN_PORT_INDEX);
  62                 x = inb_p(HTCPEN_PORT_DATA);
  63
  64                 outb_p(Y_INDEX, HTCPEN_PORT_INDEX);
  65                 y = inb_p(HTCPEN_PORT_DATA);
  66
  67                 outb_p(LSB_XY_INDEX, HTCPEN_PORT_INDEX);
  68                 xy = inb_p(HTCPEN_PORT_DATA);
  69
  70                 /* get high resolution value of X and Y using LSB */
  71                 x = X_AXIS_MAX - ((x * 8) + ((xy >> 4) & 0xf));
  72                 y = (y * 8) + (xy & 0xf);
  73                 if (invert_x)
  74                         x = X_AXIS_MAX - x;
  75                 if (invert_y)
  76                         y = Y_AXIS_MAX - y;
  77
  78                 if (x != X_AXIS_MAX && x != 0) {
  79                         input_report_key(htcpen_dev, BTN_TOUCH, 1);
  80                         input_report_abs(htcpen_dev, ABS_X, x);
  81                         input_report_abs(htcpen_dev, ABS_Y, y);
  82                 }
  83         }
  84
  85         input_sync(htcpen_dev);
  86
  87         inb_p(HTCPEN_PORT_IRQ_CLEAR);
  88
  89         return IRQ_HANDLED;
  90 }
  91
  92 static int htcpen_open(struct input_dev *dev)
  93 {
  94         outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
  95
  96         return 0;
  97 }
  98
  99 static void htcpen_close(struct input_dev *dev)
 100 {
 101         outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
 102         synchronize_irq(HTCPEN_IRQ);
 103 }
 104
 105 static int htcpen_isa_probe(struct device *dev, unsigned int id)
 106 {
 107         struct input_dev *htcpen_dev;
 108         int err = -EBUSY;
 109
 110         if (!request_region(HTCPEN_PORT_IRQ_CLEAR, 1, "htcpen")) {
 111                 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
 112                         HTCPEN_PORT_IRQ_CLEAR);
 113                 goto request_region1_failed;
 114         }
 115
 116         if (!request_region(HTCPEN_PORT_INIT, 1, "htcpen")) {
 117                 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
 118                         HTCPEN_PORT_INIT);
 119                 goto request_region2_failed;
 120         }
 121
 122         if (!request_region(HTCPEN_PORT_INDEX, 2, "htcpen")) {
 123                 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
 124                         HTCPEN_PORT_INDEX);
 125                 goto request_region3_failed;
 126         }
 127
 128         htcpen_dev = input_allocate_device();
 129         if (!htcpen_dev) {
 130                 printk(KERN_ERR "htcpen: can't allocate device\n");
 131                 err = -ENOMEM;
 132                 goto input_alloc_failed;
 133         }
 134
 135         htcpen_dev->name = "HTC Shift EC TouchScreen";
 136         htcpen_dev->id.bustype = BUS_ISA;
 137
 138         htcpen_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
 139         htcpen_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 140         input_set_abs_params(htcpen_dev, ABS_X, 0, X_AXIS_MAX, 0, 0);
 141         input_set_abs_params(htcpen_dev, ABS_Y, 0, Y_AXIS_MAX, 0, 0);
 142
 143         htcpen_dev->open = htcpen_open;
 144         htcpen_dev->close = htcpen_close;
 145
 146         err = request_irq(HTCPEN_IRQ, htcpen_interrupt, 0, "htcpen",
 147                         htcpen_dev);
 148         if (err) {
 149                 printk(KERN_ERR "htcpen: irq busy\n");
 150                 goto request_irq_failed;
 151         }
 152
 153         inb_p(HTCPEN_PORT_IRQ_CLEAR);
 154
 155         err = input_register_device(htcpen_dev);
 156         if (err)
 157                 goto input_register_failed;
 158
 159         dev_set_drvdata(dev, htcpen_dev);
 160
 161         return 0;
 162
 163  input_register_failed:
 164         free_irq(HTCPEN_IRQ, htcpen_dev);
 165  request_irq_failed:
 166         input_free_device(htcpen_dev);
 167  input_alloc_failed:
 168         release_region(HTCPEN_PORT_INDEX, 2);
 169  request_region3_failed:
 170         release_region(HTCPEN_PORT_INIT, 1);
 171  request_region2_failed:
 172         release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
 173  request_region1_failed:
 174         return err;
 175 }
 176
 177 static int htcpen_isa_remove(struct device *dev, unsigned int id)
 178 {
 179         struct input_dev *htcpen_dev = dev_get_drvdata(dev);
 180
 181         input_unregister_device(htcpen_dev);
 182
 183         free_irq(HTCPEN_IRQ, htcpen_dev);
 184
 185         release_region(HTCPEN_PORT_INDEX, 2);
 186         release_region(HTCPEN_PORT_INIT, 1);
 187         release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
 188
 189         return 0;
 190 }
 191
 192 #ifdef CONFIG_PM
 193 static int htcpen_isa_suspend(struct device *dev, unsigned int n,
 194                                 pm_message_t state)
 195 {
 196         outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
 197
 198         return 0;
 199 }
 200
 201 static int htcpen_isa_resume(struct device *dev, unsigned int n)
 202 {
 203         outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
 204
 205         return 0;
 206 }
 207 #endif
 208
 209 static struct isa_driver htcpen_isa_driver = {
 210         .probe          = htcpen_isa_probe,
 211         .remove         = htcpen_isa_remove,
 212 #ifdef CONFIG_PM
 213         .suspend        = htcpen_isa_suspend,
 214         .resume         = htcpen_isa_resume,
 215 #endif
 216         .driver = {
 217                 .owner  = THIS_MODULE,
 218                 .name   = "htcpen",
 219         }
 220 };
 221
 222 static struct dmi_system_id htcshift_dmi_table[] __initdata = {
 223         {
 224                 .ident = "Shift",
 225                 .matches = {
 226                         DMI_MATCH(DMI_SYS_VENDOR, "High Tech Computer Corp"),
 227                         DMI_MATCH(DMI_PRODUCT_NAME, "Shift"),
 228                 },
 229         },
 230         { }
 231 };
 232 MODULE_DEVICE_TABLE(dmi, htcshift_dmi_table);
 233
 234 static int __init htcpen_isa_init(void)
 235 {
 236         if (!dmi_check_system(htcshift_dmi_table))
 237                 return -ENODEV;
 238
 239         return isa_register_driver(&htcpen_isa_driver, 1);
 240 }
 241
 242 static void __exit htcpen_isa_exit(void)
 243 {
 244         isa_unregister_driver(&htcpen_isa_driver);
 245 }
 246
 247 module_init(htcpen_isa_init);
 248 module_exit(htcpen_isa_exit);