diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/input/serio/ct82c710.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/input/serio/ct82c710.c b/drivers/input/serio/ct82c710.c new file mode 100644 index 000000000..3da751f4a --- /dev/null +++ b/drivers/input/serio/ct82c710.c @@ -0,0 +1,241 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 1999-2001 Vojtech Pavlik + */ + +/* + * 82C710 C&T mouse port chip driver for Linux + */ + +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/serio.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <asm/io.h> + +MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); +MODULE_DESCRIPTION("82C710 C&T mouse port chip driver"); +MODULE_LICENSE("GPL"); + +/* + * ct82c710 interface + */ + +#define CT82C710_DEV_IDLE 0x01 /* Device Idle */ +#define CT82C710_RX_FULL 0x02 /* Device Char received */ +#define CT82C710_TX_IDLE 0x04 /* Device XMIT Idle */ +#define CT82C710_RESET 0x08 /* Device Reset */ +#define CT82C710_INTS_ON 0x10 /* Device Interrupt On */ +#define CT82C710_ERROR_FLAG 0x20 /* Device Error */ +#define CT82C710_CLEAR 0x40 /* Device Clear */ +#define CT82C710_ENABLE 0x80 /* Device Enable */ + +#define CT82C710_IRQ 12 + +#define CT82C710_DATA ct82c710_iores.start +#define CT82C710_STATUS (ct82c710_iores.start + 1) + +static struct serio *ct82c710_port; +static struct platform_device *ct82c710_device; +static struct resource ct82c710_iores; + +/* + * Interrupt handler for the 82C710 mouse port. A character + * is waiting in the 82C710. + */ + +static irqreturn_t ct82c710_interrupt(int cpl, void *dev_id) +{ + return serio_interrupt(ct82c710_port, inb(CT82C710_DATA), 0); +} + +/* + * Wait for device to send output char and flush any input char. + */ + +static int ct82c170_wait(void) +{ + int timeout = 60000; + + while ((inb(CT82C710_STATUS) & (CT82C710_RX_FULL | CT82C710_TX_IDLE | CT82C710_DEV_IDLE)) + != (CT82C710_DEV_IDLE | CT82C710_TX_IDLE) && timeout) { + + if (inb_p(CT82C710_STATUS) & CT82C710_RX_FULL) inb_p(CT82C710_DATA); + + udelay(1); + timeout--; + } + + return !timeout; +} + +static void ct82c710_close(struct serio *serio) +{ + if (ct82c170_wait()) + printk(KERN_WARNING "ct82c710.c: Device busy in close()\n"); + + outb_p(inb_p(CT82C710_STATUS) & ~(CT82C710_ENABLE | CT82C710_INTS_ON), CT82C710_STATUS); + + if (ct82c170_wait()) + printk(KERN_WARNING "ct82c710.c: Device busy in close()\n"); + + free_irq(CT82C710_IRQ, NULL); +} + +static int ct82c710_open(struct serio *serio) +{ + unsigned char status; + int err; + + err = request_irq(CT82C710_IRQ, ct82c710_interrupt, 0, "ct82c710", NULL); + if (err) + return err; + + status = inb_p(CT82C710_STATUS); + + status |= (CT82C710_ENABLE | CT82C710_RESET); + outb_p(status, CT82C710_STATUS); + + status &= ~(CT82C710_RESET); + outb_p(status, CT82C710_STATUS); + + status |= CT82C710_INTS_ON; + outb_p(status, CT82C710_STATUS); /* Enable interrupts */ + + while (ct82c170_wait()) { + printk(KERN_ERR "ct82c710: Device busy in open()\n"); + status &= ~(CT82C710_ENABLE | CT82C710_INTS_ON); + outb_p(status, CT82C710_STATUS); + free_irq(CT82C710_IRQ, NULL); + return -EBUSY; + } + + return 0; +} + +/* + * Write to the 82C710 mouse device. + */ + +static int ct82c710_write(struct serio *port, unsigned char c) +{ + if (ct82c170_wait()) return -1; + outb_p(c, CT82C710_DATA); + return 0; +} + +/* + * See if we can find a 82C710 device. Read mouse address. + */ + +static int __init ct82c710_detect(void) +{ + outb_p(0x55, 0x2fa); /* Any value except 9, ff or 36 */ + outb_p(0xaa, 0x3fa); /* Inverse of 55 */ + outb_p(0x36, 0x3fa); /* Address the chip */ + outb_p(0xe4, 0x3fa); /* 390/4; 390 = config address */ + outb_p(0x1b, 0x2fa); /* Inverse of e4 */ + outb_p(0x0f, 0x390); /* Write index */ + if (inb_p(0x391) != 0xe4) /* Config address found? */ + return -ENODEV; /* No: no 82C710 here */ + + outb_p(0x0d, 0x390); /* Write index */ + ct82c710_iores.start = inb_p(0x391) << 2; /* Get mouse I/O address */ + ct82c710_iores.end = ct82c710_iores.start + 1; + ct82c710_iores.flags = IORESOURCE_IO; + outb_p(0x0f, 0x390); + outb_p(0x0f, 0x391); /* Close config mode */ + + return 0; +} + +static int ct82c710_probe(struct platform_device *dev) +{ + ct82c710_port = kzalloc(sizeof(struct serio), GFP_KERNEL); + if (!ct82c710_port) + return -ENOMEM; + + ct82c710_port->id.type = SERIO_8042; + ct82c710_port->dev.parent = &dev->dev; + ct82c710_port->open = ct82c710_open; + ct82c710_port->close = ct82c710_close; + ct82c710_port->write = ct82c710_write; + strscpy(ct82c710_port->name, "C&T 82c710 mouse port", + sizeof(ct82c710_port->name)); + snprintf(ct82c710_port->phys, sizeof(ct82c710_port->phys), + "isa%16llx/serio0", (unsigned long long)CT82C710_DATA); + + serio_register_port(ct82c710_port); + + printk(KERN_INFO "serio: C&T 82c710 mouse port at %#llx irq %d\n", + (unsigned long long)CT82C710_DATA, CT82C710_IRQ); + + return 0; +} + +static int ct82c710_remove(struct platform_device *dev) +{ + serio_unregister_port(ct82c710_port); + + return 0; +} + +static struct platform_driver ct82c710_driver = { + .driver = { + .name = "ct82c710", + }, + .probe = ct82c710_probe, + .remove = ct82c710_remove, +}; + + +static int __init ct82c710_init(void) +{ + int error; + + error = ct82c710_detect(); + if (error) + return error; + + error = platform_driver_register(&ct82c710_driver); + if (error) + return error; + + ct82c710_device = platform_device_alloc("ct82c710", -1); + if (!ct82c710_device) { + error = -ENOMEM; + goto err_unregister_driver; + } + + error = platform_device_add_resources(ct82c710_device, &ct82c710_iores, 1); + if (error) + goto err_free_device; + + error = platform_device_add(ct82c710_device); + if (error) + goto err_free_device; + + return 0; + + err_free_device: + platform_device_put(ct82c710_device); + err_unregister_driver: + platform_driver_unregister(&ct82c710_driver); + return error; +} + +static void __exit ct82c710_exit(void) +{ + platform_device_unregister(ct82c710_device); + platform_driver_unregister(&ct82c710_driver); +} + +module_init(ct82c710_init); +module_exit(ct82c710_exit); |