LXR linux/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
  19struct opencores_kbd {
  20        struct input_dev *input;
  21        void __iomem *addr;
  22        int irq;
  23        unsigned short keycodes[128];
  24};
  25
  26static 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
  39static 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
 116static struct platform_driver opencores_kbd_device_driver = {
 117        .probe    = opencores_kbd_probe,
 118        .driver   = {
 119                .name = "opencores-kbd",
 120        },
 121};
 122module_platform_driver(opencores_kbd_device_driver);
 123
 124MODULE_LICENSE("GPL");
 125MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
 126MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");
 127