mirror of
https://github.com/torvalds/linux
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06b449d7f7
It is preferred to use sizeof(*pointer) instead of sizeof(type) due to the type of the variable can change and one needs not change the former (unlike the latter). This patch has no effect on runtime behavior. Signed-off-by: Erick Archer <erick.archer@outlook.com> Link: https://lore.kernel.org/r/AS8PR02MB7237D3D898CCC9C50C18DE078BFB2@AS8PR02MB7237.eurprd02.prod.outlook.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2000-2001 Vojtech Pavlik
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* Copyright (c) 2002 Russell King
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*/
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/*
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* Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/serio.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <mach/hardware.h>
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#include <asm/hardware/iomd.h>
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MODULE_AUTHOR("Vojtech Pavlik, Russell King");
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MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:kart");
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struct rpckbd_data {
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int tx_irq;
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int rx_irq;
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};
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static int rpckbd_write(struct serio *port, unsigned char val)
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{
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while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
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cpu_relax();
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iomd_writeb(val, IOMD_KARTTX);
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return 0;
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}
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static irqreturn_t rpckbd_rx(int irq, void *dev_id)
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{
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struct serio *port = dev_id;
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unsigned int byte;
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int handled = IRQ_NONE;
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while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
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byte = iomd_readb(IOMD_KARTRX);
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serio_interrupt(port, byte, 0);
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handled = IRQ_HANDLED;
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}
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return handled;
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}
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static irqreturn_t rpckbd_tx(int irq, void *dev_id)
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{
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return IRQ_HANDLED;
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}
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static int rpckbd_open(struct serio *port)
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{
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struct rpckbd_data *rpckbd = port->port_data;
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/* Reset the keyboard state machine. */
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iomd_writeb(0, IOMD_KCTRL);
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iomd_writeb(8, IOMD_KCTRL);
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iomd_readb(IOMD_KARTRX);
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if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
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printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
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return -EBUSY;
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}
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if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
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printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
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free_irq(rpckbd->rx_irq, port);
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return -EBUSY;
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}
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return 0;
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}
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static void rpckbd_close(struct serio *port)
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{
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struct rpckbd_data *rpckbd = port->port_data;
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free_irq(rpckbd->rx_irq, port);
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free_irq(rpckbd->tx_irq, port);
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}
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/*
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* Allocate and initialize serio structure for subsequent registration
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* with serio core.
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*/
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static int rpckbd_probe(struct platform_device *dev)
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{
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struct rpckbd_data *rpckbd;
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struct serio *serio;
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int tx_irq, rx_irq;
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rx_irq = platform_get_irq(dev, 0);
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if (rx_irq < 0)
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return rx_irq;
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tx_irq = platform_get_irq(dev, 1);
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if (tx_irq < 0)
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return tx_irq;
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serio = kzalloc(sizeof(*serio), GFP_KERNEL);
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rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
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if (!serio || !rpckbd) {
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kfree(rpckbd);
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kfree(serio);
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return -ENOMEM;
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}
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rpckbd->rx_irq = rx_irq;
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rpckbd->tx_irq = tx_irq;
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serio->id.type = SERIO_8042;
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serio->write = rpckbd_write;
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serio->open = rpckbd_open;
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serio->close = rpckbd_close;
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serio->dev.parent = &dev->dev;
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serio->port_data = rpckbd;
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strscpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
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strscpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
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platform_set_drvdata(dev, serio);
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serio_register_port(serio);
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return 0;
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}
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static void rpckbd_remove(struct platform_device *dev)
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{
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struct serio *serio = platform_get_drvdata(dev);
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struct rpckbd_data *rpckbd = serio->port_data;
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serio_unregister_port(serio);
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kfree(rpckbd);
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}
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static struct platform_driver rpckbd_driver = {
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.probe = rpckbd_probe,
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.remove_new = rpckbd_remove,
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.driver = {
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.name = "kart",
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},
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};
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module_platform_driver(rpckbd_driver);
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