// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (c) 1999-2001 Vojtech Pavlik */ /* * 82C710 C&T mouse port chip driver for Linux */ #include #include #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Vojtech Pavlik "); 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(*ct82c710_port), 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 void ct82c710_remove(struct platform_device *dev) { serio_unregister_port(ct82c710_port); } 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);