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Thomas Choufb5bbee2009-10-12 21:35:00 -07001/*
2 * Altera University Program PS2 controller driver
3 *
4 * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
5 *
6 * Based on sa1111ps2.c, which is:
7 * Copyright (C) 2002 Russell King
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/input.h>
17#include <linux/serio.h>
18#include <linux/interrupt.h>
19#include <linux/platform_device.h>
20#include <linux/io.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Thomas Choufb5bbee2009-10-12 21:35:00 -070022
23#define DRV_NAME "altera_ps2"
24
25struct ps2if {
26 struct serio *io;
27 struct resource *iomem_res;
28 void __iomem *base;
29 unsigned irq;
30};
31
32/*
33 * Read all bytes waiting in the PS2 port. There should be
34 * at the most one, but we loop for safety.
35 */
36static irqreturn_t altera_ps2_rxint(int irq, void *dev_id)
37{
38 struct ps2if *ps2if = dev_id;
39 unsigned int status;
40 int handled = IRQ_NONE;
41
42 while ((status = readl(ps2if->base)) & 0xffff0000) {
43 serio_interrupt(ps2if->io, status & 0xff, 0);
44 handled = IRQ_HANDLED;
45 }
46
47 return handled;
48}
49
50/*
51 * Write a byte to the PS2 port.
52 */
53static int altera_ps2_write(struct serio *io, unsigned char val)
54{
55 struct ps2if *ps2if = io->port_data;
56
57 writel(val, ps2if->base);
58 return 0;
59}
60
61static int altera_ps2_open(struct serio *io)
62{
63 struct ps2if *ps2if = io->port_data;
64
65 /* clear fifo */
66 while (readl(ps2if->base) & 0xffff0000)
67 /* empty */;
68
69 writel(1, ps2if->base + 4); /* enable rx irq */
70 return 0;
71}
72
73static void altera_ps2_close(struct serio *io)
74{
75 struct ps2if *ps2if = io->port_data;
76
77 writel(0, ps2if->base); /* disable rx irq */
78}
79
80/*
81 * Add one device to this driver.
82 */
Dmitry Torokhov1def7af2009-12-11 21:42:18 -080083static int __devinit altera_ps2_probe(struct platform_device *pdev)
Thomas Choufb5bbee2009-10-12 21:35:00 -070084{
85 struct ps2if *ps2if;
86 struct serio *serio;
Roel Kluin909275b2009-12-15 09:15:48 -080087 int error, irq;
Thomas Choufb5bbee2009-10-12 21:35:00 -070088
89 ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL);
90 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
91 if (!ps2if || !serio) {
92 error = -ENOMEM;
93 goto err_free_mem;
94 }
95
96 serio->id.type = SERIO_8042;
97 serio->write = altera_ps2_write;
98 serio->open = altera_ps2_open;
99 serio->close = altera_ps2_close;
100 strlcpy(serio->name, dev_name(&pdev->dev), sizeof(serio->name));
101 strlcpy(serio->phys, dev_name(&pdev->dev), sizeof(serio->phys));
102 serio->port_data = ps2if;
103 serio->dev.parent = &pdev->dev;
104 ps2if->io = serio;
105
106 ps2if->iomem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
107 if (ps2if->iomem_res == NULL) {
108 error = -ENOENT;
109 goto err_free_mem;
110 }
111
Roel Kluin909275b2009-12-15 09:15:48 -0800112
113 irq = platform_get_irq(pdev, 0);
114 if (irq < 0) {
Thomas Choufb5bbee2009-10-12 21:35:00 -0700115 error = -ENXIO;
116 goto err_free_mem;
117 }
Roel Kluin909275b2009-12-15 09:15:48 -0800118 ps2if->irq = irq;
Thomas Choufb5bbee2009-10-12 21:35:00 -0700119
120 if (!request_mem_region(ps2if->iomem_res->start,
121 resource_size(ps2if->iomem_res), pdev->name)) {
122 error = -EBUSY;
123 goto err_free_mem;
124 }
125
126 ps2if->base = ioremap(ps2if->iomem_res->start,
127 resource_size(ps2if->iomem_res));
128 if (!ps2if->base) {
129 error = -ENOMEM;
130 goto err_free_res;
131 }
132
133 error = request_irq(ps2if->irq, altera_ps2_rxint, 0, pdev->name, ps2if);
134 if (error) {
135 dev_err(&pdev->dev, "could not allocate IRQ %d: %d\n",
136 ps2if->irq, error);
137 goto err_unmap;
138 }
139
140 dev_info(&pdev->dev, "base %p, irq %d\n", ps2if->base, ps2if->irq);
141
142 serio_register_port(ps2if->io);
143 platform_set_drvdata(pdev, ps2if);
144
145 return 0;
146
147 err_unmap:
148 iounmap(ps2if->base);
149 err_free_res:
150 release_mem_region(ps2if->iomem_res->start,
151 resource_size(ps2if->iomem_res));
152 err_free_mem:
153 kfree(ps2if);
154 kfree(serio);
155 return error;
156}
157
158/*
159 * Remove one device from this driver.
160 */
Dmitry Torokhov1def7af2009-12-11 21:42:18 -0800161static int __devexit altera_ps2_remove(struct platform_device *pdev)
Thomas Choufb5bbee2009-10-12 21:35:00 -0700162{
163 struct ps2if *ps2if = platform_get_drvdata(pdev);
164
165 platform_set_drvdata(pdev, NULL);
166 serio_unregister_port(ps2if->io);
167 free_irq(ps2if->irq, ps2if);
168 iounmap(ps2if->base);
169 release_mem_region(ps2if->iomem_res->start,
170 resource_size(ps2if->iomem_res));
171 kfree(ps2if);
172
173 return 0;
174}
175
176/*
177 * Our device driver structure
178 */
179static struct platform_driver altera_ps2_driver = {
180 .probe = altera_ps2_probe,
Dmitry Torokhov1def7af2009-12-11 21:42:18 -0800181 .remove = __devexit_p(altera_ps2_remove),
Thomas Choufb5bbee2009-10-12 21:35:00 -0700182 .driver = {
183 .name = DRV_NAME,
Dmitry Torokhov898d1052009-12-11 21:10:18 -0800184 .owner = THIS_MODULE,
Thomas Choufb5bbee2009-10-12 21:35:00 -0700185 },
186};
187
188static int __init altera_ps2_init(void)
189{
190 return platform_driver_register(&altera_ps2_driver);
191}
192
193static void __exit altera_ps2_exit(void)
194{
195 platform_driver_unregister(&altera_ps2_driver);
196}
197
198module_init(altera_ps2_init);
199module_exit(altera_ps2_exit);
200
201MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
202MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
203MODULE_LICENSE("GPL");
204MODULE_ALIAS("platform:" DRV_NAME);