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