diff options
Diffstat (limited to 'drivers/input/mouse/pc110pad.c')
| -rw-r--r-- | drivers/input/mouse/pc110pad.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/drivers/input/mouse/pc110pad.c b/drivers/input/mouse/pc110pad.c new file mode 100644 index 0000000000..efa58049f7 --- /dev/null +++ b/drivers/input/mouse/pc110pad.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2000-2001 Vojtech Pavlik + * + * Based on the work of: + * Alan Cox Robin O'Leary + */ + +/* + * IBM PC110 touchpad driver for Linux + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/ioport.h> +#include <linux/input.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/pci.h> +#include <linux/delay.h> + +#include <asm/io.h> +#include <asm/irq.h> + +MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); +MODULE_DESCRIPTION("IBM PC110 touchpad driver"); +MODULE_LICENSE("GPL"); + +#define PC110PAD_OFF 0x30 +#define PC110PAD_ON 0x38 + +static int pc110pad_irq = 10; +static int pc110pad_io = 0x15e0; + +static struct input_dev *pc110pad_dev; +static int pc110pad_data[3]; +static int pc110pad_count; + +static irqreturn_t pc110pad_interrupt(int irq, void *ptr) +{ + int value = inb_p(pc110pad_io); + int handshake = inb_p(pc110pad_io + 2); + + outb(handshake | 1, pc110pad_io + 2); + udelay(2); + outb(handshake & ~1, pc110pad_io + 2); + udelay(2); + inb_p(0x64); + + pc110pad_data[pc110pad_count++] = value; + + if (pc110pad_count < 3) + return IRQ_HANDLED; + + input_report_key(pc110pad_dev, BTN_TOUCH, + pc110pad_data[0] & 0x01); + input_report_abs(pc110pad_dev, ABS_X, + pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100)); + input_report_abs(pc110pad_dev, ABS_Y, + pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80)); + input_sync(pc110pad_dev); + + pc110pad_count = 0; + return IRQ_HANDLED; +} + +static void pc110pad_close(struct input_dev *dev) +{ + outb(PC110PAD_OFF, pc110pad_io + 2); +} + +static int pc110pad_open(struct input_dev *dev) +{ + pc110pad_interrupt(0, NULL); + pc110pad_interrupt(0, NULL); + pc110pad_interrupt(0, NULL); + outb(PC110PAD_ON, pc110pad_io + 2); + pc110pad_count = 0; + + return 0; +} + +/* + * We try to avoid enabling the hardware if it's not + * there, but we don't know how to test. But we do know + * that the PC110 is not a PCI system. So if we find any + * PCI devices in the machine, we don't have a PC110. + */ +static int __init pc110pad_init(void) +{ + int err; + + if (!no_pci_devices()) + return -ENODEV; + + if (!request_region(pc110pad_io, 4, "pc110pad")) { + printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n", + pc110pad_io, pc110pad_io + 4); + return -EBUSY; + } + + outb(PC110PAD_OFF, pc110pad_io + 2); + + if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) { + printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq); + err = -EBUSY; + goto err_release_region; + } + + pc110pad_dev = input_allocate_device(); + if (!pc110pad_dev) { + printk(KERN_ERR "pc110pad: Not enough memory.\n"); + err = -ENOMEM; + goto err_free_irq; + } + + pc110pad_dev->name = "IBM PC110 TouchPad"; + pc110pad_dev->phys = "isa15e0/input0"; + pc110pad_dev->id.bustype = BUS_ISA; + pc110pad_dev->id.vendor = 0x0003; + pc110pad_dev->id.product = 0x0001; + pc110pad_dev->id.version = 0x0100; + + pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y); + pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + + input_abs_set_max(pc110pad_dev, ABS_X, 0x1ff); + input_abs_set_max(pc110pad_dev, ABS_Y, 0x0ff); + + pc110pad_dev->open = pc110pad_open; + pc110pad_dev->close = pc110pad_close; + + err = input_register_device(pc110pad_dev); + if (err) + goto err_free_dev; + + return 0; + + err_free_dev: + input_free_device(pc110pad_dev); + err_free_irq: + free_irq(pc110pad_irq, NULL); + err_release_region: + release_region(pc110pad_io, 4); + + return err; +} + +static void __exit pc110pad_exit(void) +{ + outb(PC110PAD_OFF, pc110pad_io + 2); + free_irq(pc110pad_irq, NULL); + input_unregister_device(pc110pad_dev); + release_region(pc110pad_io, 4); +} + +module_init(pc110pad_init); +module_exit(pc110pad_exit); |