drivers/input/keyboard/opencores-kbd.c

   1 /*
   2  * OpenCores Keyboard Controller Driver
   3  * http://www.opencores.org/project,keyboardcontroller
   4  *
   5  * Copyright 2007-2009 HV Sistemas S.L.
   6  *
   7  * Licensed under the GPL-2 or later.
   8  */
   9
  10 #include <linux/input.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/io.h>
  13 #include <linux/ioport.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18
  19 struct opencores_kbd {
  20         struct input_dev *input;
  21         void __iomem *addr;
  22         int irq;
  23         unsigned short keycodes[128];
  24 };
  25
  26 static irqreturn_t opencores_kbd_isr(int irq, void *dev_id)
  27 {
  28         struct opencores_kbd *opencores_kbd = dev_id;
  29         struct input_dev *input = opencores_kbd->input;
  30         unsigned char c;
  31
  32         c = readb(opencores_kbd->addr);
  33         input_report_key(input, c & 0x7f, c & 0x80 ? 0 : 1);
  34         input_sync(input);
  35
  36         return IRQ_HANDLED;
  37 }
  38
  39 static int opencores_kbd_probe(struct platform_device *pdev)
  40 {
  41         struct input_dev *input;
  42         struct opencores_kbd *opencores_kbd;
  43         struct resource *res;
  44         int irq, i, error;
  45
  46         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  47         if (!res) {
  48                 dev_err(&pdev->dev, "missing board memory resource\n");
  49                 return -EINVAL;
  50         }
  51
  52         irq = platform_get_irq(pdev, 0);
  53         if (irq < 0) {
  54                 dev_err(&pdev->dev, "missing board IRQ resource\n");
  55                 return -EINVAL;
  56         }
  57
  58         opencores_kbd = devm_kzalloc(&pdev->dev, sizeof(*opencores_kbd),
  59                                      GFP_KERNEL);
  60         if (!opencores_kbd)
  61                 return -ENOMEM;
  62
  63         input = devm_input_allocate_device(&pdev->dev);
  64         if (!input) {
  65                 dev_err(&pdev->dev, "failed to allocate input device\n");
  66                 return -ENOMEM;
  67         }
  68
  69         opencores_kbd->input = input;
  70
  71         opencores_kbd->addr = devm_ioremap_resource(&pdev->dev, res);
  72         if (IS_ERR(opencores_kbd->addr))
  73                 return PTR_ERR(opencores_kbd->addr);
  74
  75         input->name = pdev->name;
  76         input->phys = "opencores-kbd/input0";
  77
  78         input->id.bustype = BUS_HOST;
  79         input->id.vendor = 0x0001;
  80         input->id.product = 0x0001;
  81         input->id.version = 0x0100;
  82
  83         input->keycode = opencores_kbd->keycodes;
  84         input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
  85         input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);
  86
  87         __set_bit(EV_KEY, input->evbit);
  88
  89         for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
  90                 /*
  91                  * OpenCores controller happens to have scancodes match
  92                  * our KEY_* definitions.
  93                  */
  94                 opencores_kbd->keycodes[i] = i;
  95                 __set_bit(opencores_kbd->keycodes[i], input->keybit);
  96         }
  97         __clear_bit(KEY_RESERVED, input->keybit);
  98
  99         error = devm_request_irq(&pdev->dev, irq, &opencores_kbd_isr,
 100                                  IRQF_TRIGGER_RISING,
 101                                  pdev->name, opencores_kbd);
 102         if (error) {
 103                 dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
 104                 return error;
 105         }
 106
 107         error = input_register_device(input);
 108         if (error) {
 109                 dev_err(&pdev->dev, "unable to register input device\n");
 110                 return error;
 111         }
 112
 113         return 0;
 114 }
 115
 116 static struct platform_driver opencores_kbd_device_driver = {
 117         .probe    = opencores_kbd_probe,
 118         .driver   = {
 119                 .name = "opencores-kbd",
 120         },
 121 };
 122 module_platform_driver(opencores_kbd_device_driver);
 123
 124 MODULE_LICENSE("GPL");
 125 MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
 126 MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");