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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
18struct opencores_kbd {
19 struct input_dev *input;
20 struct resource *addr_res;
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 __devinit 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 = kzalloc(sizeof(*opencores_kbd), GFP_KERNEL);
59 input = input_allocate_device();
60 if (!opencores_kbd || !input) {
61 dev_err(&pdev->dev, "failed to allocate device structures\n");
62 error = -ENOMEM;
63 goto err_free_mem;
64 }
65
66 opencores_kbd->addr_res = res;
67 res = request_mem_region(res->start, resource_size(res), pdev->name);
68 if (!res) {
69 dev_err(&pdev->dev, "failed to request I/O memory\n");
70 error = -EBUSY;
71 goto err_free_mem;
72 }
73
74 opencores_kbd->addr = ioremap(res->start, resource_size(res));
75 if (!opencores_kbd->addr) {
76 dev_err(&pdev->dev, "failed to remap I/O memory\n");
77 error = -ENXIO;
78 goto err_rel_mem;
79 }
80
81 opencores_kbd->input = input;
82 opencores_kbd->irq = irq;
83
84 input->name = pdev->name;
85 input->phys = "opencores-kbd/input0";
86 input->dev.parent = &pdev->dev;
87
88 input_set_drvdata(input, opencores_kbd);
89
90 input->id.bustype = BUS_HOST;
91 input->id.vendor = 0x0001;
92 input->id.product = 0x0001;
93 input->id.version = 0x0100;
94
95 input->keycode = opencores_kbd->keycodes;
96 input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
97 input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);
98
99 __set_bit(EV_KEY, input->evbit);
100
101 for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
102
103
104
105
106 opencores_kbd->keycodes[i] = i;
107 __set_bit(opencores_kbd->keycodes[i], input->keybit);
108 }
109 __clear_bit(KEY_RESERVED, input->keybit);
110
111 error = request_irq(irq, &opencores_kbd_isr,
112 IRQF_TRIGGER_RISING, pdev->name, opencores_kbd);
113 if (error) {
114 dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
115 goto err_unmap_mem;
116 }
117
118 error = input_register_device(input);
119 if (error) {
120 dev_err(&pdev->dev, "unable to register input device\n");
121 goto err_free_irq;
122 }
123
124 platform_set_drvdata(pdev, opencores_kbd);
125
126 return 0;
127
128 err_free_irq:
129 free_irq(irq, opencores_kbd);
130 err_unmap_mem:
131 iounmap(opencores_kbd->addr);
132 err_rel_mem:
133 release_mem_region(res->start, resource_size(res));
134 err_free_mem:
135 input_free_device(input);
136 kfree(opencores_kbd);
137
138 return error;
139}
140
141static int __devexit opencores_kbd_remove(struct platform_device *pdev)
142{
143 struct opencores_kbd *opencores_kbd = platform_get_drvdata(pdev);
144
145 free_irq(opencores_kbd->irq, opencores_kbd);
146
147 iounmap(opencores_kbd->addr);
148 release_mem_region(opencores_kbd->addr_res->start,
149 resource_size(opencores_kbd->addr_res));
150 input_unregister_device(opencores_kbd->input);
151 kfree(opencores_kbd);
152
153 platform_set_drvdata(pdev, NULL);
154
155 return 0;
156}
157
158static struct platform_driver opencores_kbd_device_driver = {
159 .probe = opencores_kbd_probe,
160 .remove = __devexit_p(opencores_kbd_remove),
161 .driver = {
162 .name = "opencores-kbd",
163 },
164};
165
166static int __init opencores_kbd_init(void)
167{
168 return platform_driver_register(&opencores_kbd_device_driver);
169}
170module_init(opencores_kbd_init);
171
172static void __exit opencores_kbd_exit(void)
173{
174 platform_driver_unregister(&opencores_kbd_device_driver);
175}
176module_exit(opencores_kbd_exit);
177
178MODULE_LICENSE("GPL");
179MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
180MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");
181
