diff options
Diffstat (limited to 'drivers/input/serio/rpckbd.c')
| -rw-r--r-- | drivers/input/serio/rpckbd.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/drivers/input/serio/rpckbd.c b/drivers/input/serio/rpckbd.c new file mode 100644 index 0000000000..e8a9709f32 --- /dev/null +++ b/drivers/input/serio/rpckbd.c @@ -0,0 +1,154 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2000-2001 Vojtech Pavlik + * Copyright (c) 2002 Russell King + */ + +/* + * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM + */ + +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/serio.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/slab.h> + +#include <mach/hardware.h> +#include <asm/hardware/iomd.h> + +MODULE_AUTHOR("Vojtech Pavlik, Russell King"); +MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:kart"); + +struct rpckbd_data { + int tx_irq; + int rx_irq; +}; + +static int rpckbd_write(struct serio *port, unsigned char val) +{ + while (!(iomd_readb(IOMD_KCTRL) & (1 << 7))) + cpu_relax(); + + iomd_writeb(val, IOMD_KARTTX); + + return 0; +} + +static irqreturn_t rpckbd_rx(int irq, void *dev_id) +{ + struct serio *port = dev_id; + unsigned int byte; + int handled = IRQ_NONE; + + while (iomd_readb(IOMD_KCTRL) & (1 << 5)) { + byte = iomd_readb(IOMD_KARTRX); + + serio_interrupt(port, byte, 0); + handled = IRQ_HANDLED; + } + return handled; +} + +static irqreturn_t rpckbd_tx(int irq, void *dev_id) +{ + return IRQ_HANDLED; +} + +static int rpckbd_open(struct serio *port) +{ + struct rpckbd_data *rpckbd = port->port_data; + + /* Reset the keyboard state machine. */ + iomd_writeb(0, IOMD_KCTRL); + iomd_writeb(8, IOMD_KCTRL); + iomd_readb(IOMD_KARTRX); + + if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) { + printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n"); + return -EBUSY; + } + + if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) { + printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n"); + free_irq(rpckbd->rx_irq, port); + return -EBUSY; + } + + return 0; +} + +static void rpckbd_close(struct serio *port) +{ + struct rpckbd_data *rpckbd = port->port_data; + + free_irq(rpckbd->rx_irq, port); + free_irq(rpckbd->tx_irq, port); +} + +/* + * Allocate and initialize serio structure for subsequent registration + * with serio core. + */ +static int rpckbd_probe(struct platform_device *dev) +{ + struct rpckbd_data *rpckbd; + struct serio *serio; + int tx_irq, rx_irq; + + rx_irq = platform_get_irq(dev, 0); + if (rx_irq < 0) + return rx_irq; + + tx_irq = platform_get_irq(dev, 1); + if (tx_irq < 0) + return tx_irq; + + serio = kzalloc(sizeof(struct serio), GFP_KERNEL); + rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL); + if (!serio || !rpckbd) { + kfree(rpckbd); + kfree(serio); + return -ENOMEM; + } + + rpckbd->rx_irq = rx_irq; + rpckbd->tx_irq = tx_irq; + + serio->id.type = SERIO_8042; + serio->write = rpckbd_write; + serio->open = rpckbd_open; + serio->close = rpckbd_close; + serio->dev.parent = &dev->dev; + serio->port_data = rpckbd; + strscpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name)); + strscpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys)); + + platform_set_drvdata(dev, serio); + serio_register_port(serio); + return 0; +} + +static int rpckbd_remove(struct platform_device *dev) +{ + struct serio *serio = platform_get_drvdata(dev); + struct rpckbd_data *rpckbd = serio->port_data; + + serio_unregister_port(serio); + kfree(rpckbd); + + return 0; +} + +static struct platform_driver rpckbd_driver = { + .probe = rpckbd_probe, + .remove = rpckbd_remove, + .driver = { + .name = "kart", + }, +}; +module_platform_driver(rpckbd_driver); |