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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         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");
169 

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