diff options
Diffstat (limited to 'drivers/input/serio/maceps2.c')
| -rw-r--r-- | drivers/input/serio/maceps2.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/drivers/input/serio/maceps2.c b/drivers/input/serio/maceps2.c new file mode 100644 index 0000000000..629e15089c --- /dev/null +++ b/drivers/input/serio/maceps2.c @@ -0,0 +1,206 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SGI O2 MACE PS2 controller driver for linux + * + * Copyright (C) 2002 Vivien Chappelier + */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/serio.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/err.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/ip32/mace.h> +#include <asm/ip32/ip32_ints.h> + +MODULE_AUTHOR("Vivien Chappelier <vivien.chappelier@linux-mips.org"); +MODULE_DESCRIPTION("SGI O2 MACE PS2 controller driver"); +MODULE_LICENSE("GPL"); + +#define MACE_PS2_TIMEOUT 10000 /* in 50us unit */ + +#define PS2_STATUS_CLOCK_SIGNAL BIT(0) /* external clock signal */ +#define PS2_STATUS_CLOCK_INHIBIT BIT(1) /* clken output signal */ +#define PS2_STATUS_TX_INPROGRESS BIT(2) /* transmission in progress */ +#define PS2_STATUS_TX_EMPTY BIT(3) /* empty transmit buffer */ +#define PS2_STATUS_RX_FULL BIT(4) /* full receive buffer */ +#define PS2_STATUS_RX_INPROGRESS BIT(5) /* reception in progress */ +#define PS2_STATUS_ERROR_PARITY BIT(6) /* parity error */ +#define PS2_STATUS_ERROR_FRAMING BIT(7) /* framing error */ + +#define PS2_CONTROL_TX_CLOCK_DISABLE BIT(0) /* inhibit clock signal after TX */ +#define PS2_CONTROL_TX_ENABLE BIT(1) /* transmit enable */ +#define PS2_CONTROL_TX_INT_ENABLE BIT(2) /* enable transmit interrupt */ +#define PS2_CONTROL_RX_INT_ENABLE BIT(3) /* enable receive interrupt */ +#define PS2_CONTROL_RX_CLOCK_ENABLE BIT(4) /* pause reception if set to 0 */ +#define PS2_CONTROL_RESET BIT(5) /* reset */ + +struct maceps2_data { + struct mace_ps2port *port; + int irq; +}; + +static struct maceps2_data port_data[2]; +static struct serio *maceps2_port[2]; +static struct platform_device *maceps2_device; + +static int maceps2_write(struct serio *dev, unsigned char val) +{ + struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port; + unsigned int timeout = MACE_PS2_TIMEOUT; + + do { + if (port->status & PS2_STATUS_TX_EMPTY) { + port->tx = val; + return 0; + } + udelay(50); + } while (timeout--); + + return -1; +} + +static irqreturn_t maceps2_interrupt(int irq, void *dev_id) +{ + struct serio *dev = dev_id; + struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port; + unsigned long byte; + + if (port->status & PS2_STATUS_RX_FULL) { + byte = port->rx; + serio_interrupt(dev, byte & 0xff, 0); + } + + return IRQ_HANDLED; +} + +static int maceps2_open(struct serio *dev) +{ + struct maceps2_data *data = (struct maceps2_data *)dev->port_data; + + if (request_irq(data->irq, maceps2_interrupt, 0, "PS2 port", dev)) { + printk(KERN_ERR "Could not allocate PS/2 IRQ\n"); + return -EBUSY; + } + + /* Reset port */ + data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET; + udelay(100); + + /* Enable interrupts */ + data->port->control = PS2_CONTROL_RX_CLOCK_ENABLE | + PS2_CONTROL_TX_ENABLE | + PS2_CONTROL_RX_INT_ENABLE; + + return 0; +} + +static void maceps2_close(struct serio *dev) +{ + struct maceps2_data *data = (struct maceps2_data *)dev->port_data; + + data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET; + udelay(100); + free_irq(data->irq, dev); +} + + +static struct serio *maceps2_allocate_port(int idx) +{ + struct serio *serio; + + serio = kzalloc(sizeof(struct serio), GFP_KERNEL); + if (serio) { + serio->id.type = SERIO_8042; + serio->write = maceps2_write; + serio->open = maceps2_open; + serio->close = maceps2_close; + snprintf(serio->name, sizeof(serio->name), "MACE PS/2 port%d", idx); + snprintf(serio->phys, sizeof(serio->phys), "mace/serio%d", idx); + serio->port_data = &port_data[idx]; + serio->dev.parent = &maceps2_device->dev; + } + + return serio; +} + +static int maceps2_probe(struct platform_device *dev) +{ + maceps2_port[0] = maceps2_allocate_port(0); + maceps2_port[1] = maceps2_allocate_port(1); + if (!maceps2_port[0] || !maceps2_port[1]) { + kfree(maceps2_port[0]); + kfree(maceps2_port[1]); + return -ENOMEM; + } + + serio_register_port(maceps2_port[0]); + serio_register_port(maceps2_port[1]); + + return 0; +} + +static int maceps2_remove(struct platform_device *dev) +{ + serio_unregister_port(maceps2_port[0]); + serio_unregister_port(maceps2_port[1]); + + return 0; +} + +static struct platform_driver maceps2_driver = { + .driver = { + .name = "maceps2", + }, + .probe = maceps2_probe, + .remove = maceps2_remove, +}; + +static int __init maceps2_init(void) +{ + int error; + + error = platform_driver_register(&maceps2_driver); + if (error) + return error; + + maceps2_device = platform_device_alloc("maceps2", -1); + if (!maceps2_device) { + error = -ENOMEM; + goto err_unregister_driver; + } + + port_data[0].port = &mace->perif.ps2.keyb; + port_data[0].irq = MACEISA_KEYB_IRQ; + port_data[1].port = &mace->perif.ps2.mouse; + port_data[1].irq = MACEISA_MOUSE_IRQ; + + error = platform_device_add(maceps2_device); + if (error) + goto err_free_device; + + return 0; + + err_free_device: + platform_device_put(maceps2_device); + err_unregister_driver: + platform_driver_unregister(&maceps2_driver); + return error; +} + +static void __exit maceps2_exit(void) +{ + platform_device_unregister(maceps2_device); + platform_driver_unregister(&maceps2_driver); +} + +module_init(maceps2_init); +module_exit(maceps2_exit); |