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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 
 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_set_drvdata(input, opencores_kbd);
 79 
 80         input->id.bustype = BUS_HOST;
 81         input->id.vendor = 0x0001;
 82         input->id.product = 0x0001;
 83         input->id.version = 0x0100;
 84 
 85         input->keycode = opencores_kbd->keycodes;
 86         input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
 87         input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);
 88 
 89         __set_bit(EV_KEY, input->evbit);
 90 
 91         for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
 92                 /*
 93                  * OpenCores controller happens to have scancodes match
 94                  * our KEY_* definitions.
 95                  */
 96                 opencores_kbd->keycodes[i] = i;
 97                 __set_bit(opencores_kbd->keycodes[i], input->keybit);
 98         }
 99         __clear_bit(KEY_RESERVED, input->keybit);
100 
101         error = devm_request_irq(&pdev->dev, irq, &opencores_kbd_isr,
102                                  IRQF_TRIGGER_RISING,
103                                  pdev->name, opencores_kbd);
104         if (error) {
105                 dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
106                 return error;
107         }
108 
109         error = input_register_device(input);
110         if (error) {
111                 dev_err(&pdev->dev, "unable to register input device\n");
112                 return error;
113         }
114 
115         platform_set_drvdata(pdev, opencores_kbd);
116 
117         return 0;
118 }
119 
120 static struct platform_driver opencores_kbd_device_driver = {
121         .probe    = opencores_kbd_probe,
122         .driver   = {
123                 .name = "opencores-kbd",
124         },
125 };
126 module_platform_driver(opencores_kbd_device_driver);
127 
128 MODULE_LICENSE("GPL");
129 MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
130 MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");
131 

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