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         struct resource *addr_res;
  22         void __iomem *addr;
  23         int irq;
  24         unsigned short keycodes[128];
  25 };
  26
  27 static irqreturn_t opencores_kbd_isr(int irq, void *dev_id)
  28 {
  29         struct opencores_kbd *opencores_kbd = dev_id;
  30         struct input_dev *input = opencores_kbd->input;
  31         unsigned char c;
  32
  33         c = readb(opencores_kbd->addr);
  34         input_report_key(input, c & 0x7f, c & 0x80 ? 0 : 1);
  35         input_sync(input);
  36
  37         return IRQ_HANDLED;
  38 }
  39
  40 static int opencores_kbd_probe(struct platform_device *pdev)
  41 {
  42         struct input_dev *input;
  43         struct opencores_kbd *opencores_kbd;
  44         struct resource *res;
  45         int irq, i, error;
  46
  47         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  48         if (!res) {
  49                 dev_err(&pdev->dev, "missing board memory resource\n");
  50                 return -EINVAL;
  51         }
  52
  53         irq = platform_get_irq(pdev, 0);
  54         if (irq < 0) {
  55                 dev_err(&pdev->dev, "missing board IRQ resource\n");
  56                 return -EINVAL;
  57         }
  58
  59         opencores_kbd = kzalloc(sizeof(*opencores_kbd), GFP_KERNEL);
  60         input = input_allocate_device();
  61         if (!opencores_kbd || !input) {
  62                 dev_err(&pdev->dev, "failed to allocate device structures\n");
  63                 error = -ENOMEM;
  64                 goto err_free_mem;
  65         }
  66
  67         opencores_kbd->addr_res = res;
  68         res = request_mem_region(res->start, resource_size(res), pdev->name);
  69         if (!res) {
  70                 dev_err(&pdev->dev, "failed to request I/O memory\n");
  71                 error = -EBUSY;
  72                 goto err_free_mem;
  73         }
  74
  75         opencores_kbd->addr = ioremap(res->start, resource_size(res));
  76         if (!opencores_kbd->addr) {
  77                 dev_err(&pdev->dev, "failed to remap I/O memory\n");
  78                 error = -ENXIO;
  79                 goto err_rel_mem;
  80         }
  81
  82         opencores_kbd->input = input;
  83         opencores_kbd->irq = irq;
  84
  85         input->name = pdev->name;
  86         input->phys = "opencores-kbd/input0";
  87         input->dev.parent = &pdev->dev;
  88
  89         input_set_drvdata(input, opencores_kbd);
  90
  91         input->id.bustype = BUS_HOST;
  92         input->id.vendor = 0x0001;
  93         input->id.product = 0x0001;
  94         input->id.version = 0x0100;
  95
  96         input->keycode = opencores_kbd->keycodes;
  97         input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
  98         input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);
  99
 100         __set_bit(EV_KEY, input->evbit);
 101
 102         for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
 103                 /*
 104                  * OpenCores controller happens to have scancodes match
 105                  * our KEY_* definitions.
 106                  */
 107                 opencores_kbd->keycodes[i] = i;
 108                 __set_bit(opencores_kbd->keycodes[i], input->keybit);
 109         }
 110         __clear_bit(KEY_RESERVED, input->keybit);
 111
 112         error = request_irq(irq, &opencores_kbd_isr,
 113                             IRQF_TRIGGER_RISING, pdev->name, opencores_kbd);
 114         if (error) {
 115                 dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
 116                 goto err_unmap_mem;
 117         }
 118
 119         error = input_register_device(input);
 120         if (error) {
 121                 dev_err(&pdev->dev, "unable to register input device\n");
 122                 goto err_free_irq;
 123         }
 124
 125         platform_set_drvdata(pdev, opencores_kbd);
 126
 127         return 0;
 128
 129  err_free_irq:
 130         free_irq(irq, opencores_kbd);
 131  err_unmap_mem:
 132         iounmap(opencores_kbd->addr);
 133  err_rel_mem:
 134         release_mem_region(res->start, resource_size(res));
 135  err_free_mem:
 136         input_free_device(input);
 137         kfree(opencores_kbd);
 138
 139         return error;
 140 }
 141
 142 static int opencores_kbd_remove(struct platform_device *pdev)
 143 {
 144         struct opencores_kbd *opencores_kbd = platform_get_drvdata(pdev);
 145
 146         free_irq(opencores_kbd->irq, opencores_kbd);
 147
 148         iounmap(opencores_kbd->addr);
 149         release_mem_region(opencores_kbd->addr_res->start,
 150                 resource_size(opencores_kbd->addr_res));
 151         input_unregister_device(opencores_kbd->input);
 152         kfree(opencores_kbd);
 153
 154         return 0;
 155 }
 156
 157 static struct platform_driver opencores_kbd_device_driver = {
 158         .probe    = opencores_kbd_probe,
 159         .remove   = opencores_kbd_remove,
 160         .driver   = {
 161                 .name = "opencores-kbd",
 162         },
 163 };
 164 module_platform_driver(opencores_kbd_device_driver);
 165
 166 MODULE_LICENSE("GPL");
 167 MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
 168 MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");