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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#include <linux/slab.h>
18
19struct 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
27static 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
40static int __devinit 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
105
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
142static int __devexit 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 platform_set_drvdata(pdev, NULL);
155
156 return 0;
157}
158
159static struct platform_driver opencores_kbd_device_driver = {
160 .probe = opencores_kbd_probe,
161 .remove = __devexit_p(opencores_kbd_remove),
162 .driver = {
163 .name = "opencores-kbd",
164 },
165};
166
167static int __init opencores_kbd_init(void)
168{
169 return platform_driver_register(&opencores_kbd_device_driver);
170}
171module_init(opencores_kbd_init);
172
173static void __exit opencores_kbd_exit(void)
174{
175 platform_driver_unregister(&opencores_kbd_device_driver);
176}
177module_exit(opencores_kbd_exit);
178
179MODULE_LICENSE("GPL");
180MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
181MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");
182
