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* linux/drivers/input/serio/ambakmi.c
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* Copyright (C) 2000-2003 Deep Blue Solutions Ltd.
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* Copyright (C) 2002 Russell King.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/serio.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/amba/bus.h>
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#include <linux/amba/kmi.h>
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#include <linux/clk.h>
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#define KMI_BASE (kmi->base)
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struct amba_kmi_port {
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static irqreturn_t amba_kmi_int(int irq, void *dev_id)
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struct amba_kmi_port *kmi = dev_id;
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unsigned int status = readb(KMIIR);
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int handled = IRQ_NONE;
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while (status & KMIIR_RXINTR) {
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serio_interrupt(kmi->io, readb(KMIDATA), 0);
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status = readb(KMIIR);
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handled = IRQ_HANDLED;
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static int amba_kmi_write(struct serio *io, unsigned char val)
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struct amba_kmi_port *kmi = io->port_data;
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unsigned int timeleft = 10000; /* timeout in 100ms */
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while ((readb(KMISTAT) & KMISTAT_TXEMPTY) == 0 && --timeleft)
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return timeleft ? 0 : SERIO_TIMEOUT;
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static int amba_kmi_open(struct serio *io)
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struct amba_kmi_port *kmi = io->port_data;
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ret = clk_enable(kmi->clk);
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divisor = clk_get_rate(kmi->clk) / 8000000 - 1;
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writeb(divisor, KMICLKDIV);
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writeb(KMICR_EN, KMICR);
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ret = request_irq(kmi->irq, amba_kmi_int, 0, "kmi-pl050", kmi);
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printk(KERN_ERR "kmi: failed to claim IRQ%d\n", kmi->irq);
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writeb(KMICR_EN | KMICR_RXINTREN, KMICR);
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clk_disable(kmi->clk);
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static void amba_kmi_close(struct serio *io)
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struct amba_kmi_port *kmi = io->port_data;
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free_irq(kmi->irq, kmi);
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clk_disable(kmi->clk);
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static int __devinit amba_kmi_probe(struct amba_device *dev,
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const struct amba_id *id)
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struct amba_kmi_port *kmi;
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ret = amba_request_regions(dev, NULL);
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kmi = kzalloc(sizeof(struct amba_kmi_port), GFP_KERNEL);
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io = kzalloc(sizeof(struct serio), GFP_KERNEL);
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io->id.type = SERIO_8042;
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io->write = amba_kmi_write;
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io->open = amba_kmi_open;
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io->close = amba_kmi_close;
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strlcpy(io->name, dev_name(&dev->dev), sizeof(io->name));
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strlcpy(io->phys, dev_name(&dev->dev), sizeof(io->phys));
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io->dev.parent = &dev->dev;
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kmi->base = ioremap(dev->res.start, resource_size(&dev->res));
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kmi->clk = clk_get(&dev->dev, "KMIREFCLK");
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if (IS_ERR(kmi->clk)) {
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ret = PTR_ERR(kmi->clk);
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kmi->irq = dev->irq[0];
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amba_set_drvdata(dev, kmi);
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serio_register_port(kmi->io);
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amba_release_regions(dev);
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static int __devexit amba_kmi_remove(struct amba_device *dev)
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struct amba_kmi_port *kmi = amba_get_drvdata(dev);
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amba_set_drvdata(dev, NULL);
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serio_unregister_port(kmi->io);
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amba_release_regions(dev);
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static int amba_kmi_resume(struct amba_device *dev)
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struct amba_kmi_port *kmi = amba_get_drvdata(dev);
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/* kick the serio layer to rescan this port */
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serio_reconnect(kmi->io);
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static struct amba_id amba_kmi_idtable[] = {
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static struct amba_driver ambakmi_driver = {
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.owner = THIS_MODULE,
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.id_table = amba_kmi_idtable,
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.probe = amba_kmi_probe,
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.remove = __devexit_p(amba_kmi_remove),
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.resume = amba_kmi_resume,
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static int __init amba_kmi_init(void)
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return amba_driver_register(&ambakmi_driver);
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static void __exit amba_kmi_exit(void)
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amba_driver_unregister(&ambakmi_driver);
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module_init(amba_kmi_init);
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module_exit(amba_kmi_exit);
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MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
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MODULE_DESCRIPTION("AMBA KMI controller driver");
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MODULE_LICENSE("GPL");