2 * Altera University Program PS2 controller driver
4 * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
6 * Based on sa1111ps2.c, which is:
7 * Copyright (C) 2002 Russell King
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.
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>
22 #define DRV_NAME "altera_ps2"
26 struct resource *iomem_res;
32 * Read all bytes waiting in the PS2 port. There should be
33 * at the most one, but we loop for safety.
35 static irqreturn_t altera_ps2_rxint(int irq, void *dev_id)
37 struct ps2if *ps2if = dev_id;
39 int handled = IRQ_NONE;
41 while ((status = readl(ps2if->base)) & 0xffff0000) {
42 serio_interrupt(ps2if->io, status & 0xff, 0);
43 handled = IRQ_HANDLED;
50 * Write a byte to the PS2 port.
52 static int altera_ps2_write(struct serio *io, unsigned char val)
54 struct ps2if *ps2if = io->port_data;
56 writel(val, ps2if->base);
60 static int altera_ps2_open(struct serio *io)
62 struct ps2if *ps2if = io->port_data;
65 while (readl(ps2if->base) & 0xffff0000)
68 writel(1, ps2if->base + 4); /* enable rx irq */
72 static void altera_ps2_close(struct serio *io)
74 struct ps2if *ps2if = io->port_data;
76 writel(0, ps2if->base); /* disable rx irq */
80 * Add one device to this driver.
82 static int __devinit altera_ps2_probe(struct platform_device *pdev)
88 ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL);
89 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
90 if (!ps2if || !serio) {
95 serio->id.type = SERIO_8042;
96 serio->write = altera_ps2_write;
97 serio->open = altera_ps2_open;
98 serio->close = altera_ps2_close;
99 strlcpy(serio->name, dev_name(&pdev->dev), sizeof(serio->name));
100 strlcpy(serio->phys, dev_name(&pdev->dev), sizeof(serio->phys));
101 serio->port_data = ps2if;
102 serio->dev.parent = &pdev->dev;
105 ps2if->iomem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
106 if (ps2if->iomem_res == NULL) {
111 ps2if->irq = platform_get_irq(pdev, 0);
112 if (ps2if->irq < 0) {
117 if (!request_mem_region(ps2if->iomem_res->start,
118 resource_size(ps2if->iomem_res), pdev->name)) {
123 ps2if->base = ioremap(ps2if->iomem_res->start,
124 resource_size(ps2if->iomem_res));
130 error = request_irq(ps2if->irq, altera_ps2_rxint, 0, pdev->name, ps2if);
132 dev_err(&pdev->dev, "could not allocate IRQ %d: %d\n",
137 dev_info(&pdev->dev, "base %p, irq %d\n", ps2if->base, ps2if->irq);
139 serio_register_port(ps2if->io);
140 platform_set_drvdata(pdev, ps2if);
145 iounmap(ps2if->base);
147 release_mem_region(ps2if->iomem_res->start,
148 resource_size(ps2if->iomem_res));
156 * Remove one device from this driver.
158 static int __devexit altera_ps2_remove(struct platform_device *pdev)
160 struct ps2if *ps2if = platform_get_drvdata(pdev);
162 platform_set_drvdata(pdev, NULL);
163 serio_unregister_port(ps2if->io);
164 free_irq(ps2if->irq, ps2if);
165 iounmap(ps2if->base);
166 release_mem_region(ps2if->iomem_res->start,
167 resource_size(ps2if->iomem_res));
174 * Our device driver structure
176 static struct platform_driver altera_ps2_driver = {
177 .probe = altera_ps2_probe,
178 .remove = __devexit_p(altera_ps2_remove),
181 .owner = THIS_MODULE,
185 static int __init altera_ps2_init(void)
187 return platform_driver_register(&altera_ps2_driver);
190 static void __exit altera_ps2_exit(void)
192 platform_driver_unregister(&altera_ps2_driver);
195 module_init(altera_ps2_init);
196 module_exit(altera_ps2_exit);
198 MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
199 MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
200 MODULE_LICENSE("GPL");
201 MODULE_ALIAS("platform:" DRV_NAME);