diff options
Diffstat (limited to 'drivers/input/serio/pcips2.c')
| -rw-r--r-- | drivers/input/serio/pcips2.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/drivers/input/serio/pcips2.c b/drivers/input/serio/pcips2.c new file mode 100644 index 000000000..bedf75de0 --- /dev/null +++ b/drivers/input/serio/pcips2.c @@ -0,0 +1,217 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/drivers/input/serio/pcips2.c + * + * Copyright (C) 2003 Russell King, All Rights Reserved. + * + * I'm not sure if this is a generic PS/2 PCI interface or specific to + * the Mobility Electronics docking station. + */ +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/input.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/serio.h> +#include <linux/delay.h> +#include <asm/io.h> + +#define PS2_CTRL (0) +#define PS2_STATUS (1) +#define PS2_DATA (2) + +#define PS2_CTRL_CLK (1<<0) +#define PS2_CTRL_DAT (1<<1) +#define PS2_CTRL_TXIRQ (1<<2) +#define PS2_CTRL_ENABLE (1<<3) +#define PS2_CTRL_RXIRQ (1<<4) + +#define PS2_STAT_CLK (1<<0) +#define PS2_STAT_DAT (1<<1) +#define PS2_STAT_PARITY (1<<2) +#define PS2_STAT_RXFULL (1<<5) +#define PS2_STAT_TXBUSY (1<<6) +#define PS2_STAT_TXEMPTY (1<<7) + +struct pcips2_data { + struct serio *io; + unsigned int base; + struct pci_dev *dev; +}; + +static int pcips2_write(struct serio *io, unsigned char val) +{ + struct pcips2_data *ps2if = io->port_data; + unsigned int stat; + + do { + stat = inb(ps2if->base + PS2_STATUS); + cpu_relax(); + } while (!(stat & PS2_STAT_TXEMPTY)); + + outb(val, ps2if->base + PS2_DATA); + + return 0; +} + +static irqreturn_t pcips2_interrupt(int irq, void *devid) +{ + struct pcips2_data *ps2if = devid; + unsigned char status, scancode; + int handled = 0; + + do { + unsigned int flag; + + status = inb(ps2if->base + PS2_STATUS); + if (!(status & PS2_STAT_RXFULL)) + break; + handled = 1; + scancode = inb(ps2if->base + PS2_DATA); + if (status == 0xff && scancode == 0xff) + break; + + flag = (status & PS2_STAT_PARITY) ? 0 : SERIO_PARITY; + + if (hweight8(scancode) & 1) + flag ^= SERIO_PARITY; + + serio_interrupt(ps2if->io, scancode, flag); + } while (1); + return IRQ_RETVAL(handled); +} + +static void pcips2_flush_input(struct pcips2_data *ps2if) +{ + unsigned char status, scancode; + + do { + status = inb(ps2if->base + PS2_STATUS); + if (!(status & PS2_STAT_RXFULL)) + break; + scancode = inb(ps2if->base + PS2_DATA); + if (status == 0xff && scancode == 0xff) + break; + } while (1); +} + +static int pcips2_open(struct serio *io) +{ + struct pcips2_data *ps2if = io->port_data; + int ret, val = 0; + + outb(PS2_CTRL_ENABLE, ps2if->base); + pcips2_flush_input(ps2if); + + ret = request_irq(ps2if->dev->irq, pcips2_interrupt, IRQF_SHARED, + "pcips2", ps2if); + if (ret == 0) + val = PS2_CTRL_ENABLE | PS2_CTRL_RXIRQ; + + outb(val, ps2if->base); + + return ret; +} + +static void pcips2_close(struct serio *io) +{ + struct pcips2_data *ps2if = io->port_data; + + outb(0, ps2if->base); + + free_irq(ps2if->dev->irq, ps2if); +} + +static int pcips2_probe(struct pci_dev *dev, const struct pci_device_id *id) +{ + struct pcips2_data *ps2if; + struct serio *serio; + int ret; + + ret = pci_enable_device(dev); + if (ret) + goto out; + + ret = pci_request_regions(dev, "pcips2"); + if (ret) + goto disable; + + ps2if = kzalloc(sizeof(struct pcips2_data), GFP_KERNEL); + serio = kzalloc(sizeof(struct serio), GFP_KERNEL); + if (!ps2if || !serio) { + ret = -ENOMEM; + goto release; + } + + + serio->id.type = SERIO_8042; + serio->write = pcips2_write; + serio->open = pcips2_open; + serio->close = pcips2_close; + strlcpy(serio->name, pci_name(dev), sizeof(serio->name)); + strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys)); + serio->port_data = ps2if; + serio->dev.parent = &dev->dev; + ps2if->io = serio; + ps2if->dev = dev; + ps2if->base = pci_resource_start(dev, 0); + + pci_set_drvdata(dev, ps2if); + + serio_register_port(ps2if->io); + return 0; + + release: + kfree(ps2if); + kfree(serio); + pci_release_regions(dev); + disable: + pci_disable_device(dev); + out: + return ret; +} + +static void pcips2_remove(struct pci_dev *dev) +{ + struct pcips2_data *ps2if = pci_get_drvdata(dev); + + serio_unregister_port(ps2if->io); + kfree(ps2if); + pci_release_regions(dev); + pci_disable_device(dev); +} + +static const struct pci_device_id pcips2_ids[] = { + { + .vendor = 0x14f2, /* MOBILITY */ + .device = 0x0123, /* Keyboard */ + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, + .class = PCI_CLASS_INPUT_KEYBOARD << 8, + .class_mask = 0xffff00, + }, + { + .vendor = 0x14f2, /* MOBILITY */ + .device = 0x0124, /* Mouse */ + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, + .class = PCI_CLASS_INPUT_MOUSE << 8, + .class_mask = 0xffff00, + }, + { 0, } +}; +MODULE_DEVICE_TABLE(pci, pcips2_ids); + +static struct pci_driver pcips2_driver = { + .name = "pcips2", + .id_table = pcips2_ids, + .probe = pcips2_probe, + .remove = pcips2_remove, +}; + +module_pci_driver(pcips2_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); +MODULE_DESCRIPTION("PCI PS/2 keyboard/mouse driver"); |