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 0000000000..3da751f4a6
--- /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);