drivers/input/serio/pcips2.c

   1 /*
   2  * linux/drivers/input/serio/pcips2.c
   3  *
   4  *  Copyright (C) 2003 Russell King, All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License.
   9  *
  10  *  I'm not sure if this is a generic PS/2 PCI interface or specific to
  11  *  the Mobility Electronics docking station.
  12  */
  13 #include <linux/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/ioport.h>
  16 #include <linux/input.h>
  17 #include <linux/pci.h>
  18 #include <linux/slab.h>
  19 #include <linux/serio.h>
  20 #include <linux/delay.h>
  21 #include <asm/io.h>
  22
  23 #define PS2_CTRL                (0)
  24 #define PS2_STATUS              (1)
  25 #define PS2_DATA                (2)
  26
  27 #define PS2_CTRL_CLK            (1<<0)
  28 #define PS2_CTRL_DAT            (1<<1)
  29 #define PS2_CTRL_TXIRQ          (1<<2)
  30 #define PS2_CTRL_ENABLE         (1<<3)
  31 #define PS2_CTRL_RXIRQ          (1<<4)
  32
  33 #define PS2_STAT_CLK            (1<<0)
  34 #define PS2_STAT_DAT            (1<<1)
  35 #define PS2_STAT_PARITY         (1<<2)
  36 #define PS2_STAT_RXFULL         (1<<5)
  37 #define PS2_STAT_TXBUSY         (1<<6)
  38 #define PS2_STAT_TXEMPTY        (1<<7)
  39
  40 struct pcips2_data {
  41         struct serio    *io;
  42         unsigned int    base;
  43         struct pci_dev  *dev;
  44 };
  45
  46 static int pcips2_write(struct serio *io, unsigned char val)
  47 {
  48         struct pcips2_data *ps2if = io->port_data;
  49         unsigned int stat;
  50
  51         do {
  52                 stat = inb(ps2if->base + PS2_STATUS);
  53                 cpu_relax();
  54         } while (!(stat & PS2_STAT_TXEMPTY));
  55
  56         outb(val, ps2if->base + PS2_DATA);
  57
  58         return 0;
  59 }
  60
  61 static irqreturn_t pcips2_interrupt(int irq, void *devid)
  62 {
  63         struct pcips2_data *ps2if = devid;
  64         unsigned char status, scancode;
  65         int handled = 0;
  66
  67         do {
  68                 unsigned int flag;
  69
  70                 status = inb(ps2if->base + PS2_STATUS);
  71                 if (!(status & PS2_STAT_RXFULL))
  72                         break;
  73                 handled = 1;
  74                 scancode = inb(ps2if->base + PS2_DATA);
  75                 if (status == 0xff && scancode == 0xff)
  76                         break;
  77
  78                 flag = (status & PS2_STAT_PARITY) ? 0 : SERIO_PARITY;
  79
  80                 if (hweight8(scancode) & 1)
  81                         flag ^= SERIO_PARITY;
  82
  83                 serio_interrupt(ps2if->io, scancode, flag);
  84         } while (1);
  85         return IRQ_RETVAL(handled);
  86 }
  87
  88 static void pcips2_flush_input(struct pcips2_data *ps2if)
  89 {
  90         unsigned char status, scancode;
  91
  92         do {
  93                 status = inb(ps2if->base + PS2_STATUS);
  94                 if (!(status & PS2_STAT_RXFULL))
  95                         break;
  96                 scancode = inb(ps2if->base + PS2_DATA);
  97                 if (status == 0xff && scancode == 0xff)
  98                         break;
  99         } while (1);
 100 }
 101
 102 static int pcips2_open(struct serio *io)
 103 {
 104         struct pcips2_data *ps2if = io->port_data;
 105         int ret, val = 0;
 106
 107         outb(PS2_CTRL_ENABLE, ps2if->base);
 108         pcips2_flush_input(ps2if);
 109
 110         ret = request_irq(ps2if->dev->irq, pcips2_interrupt, IRQF_SHARED,
 111                           "pcips2", ps2if);
 112         if (ret == 0)
 113                 val = PS2_CTRL_ENABLE | PS2_CTRL_RXIRQ;
 114
 115         outb(val, ps2if->base);
 116
 117         return ret;
 118 }
 119
 120 static void pcips2_close(struct serio *io)
 121 {
 122         struct pcips2_data *ps2if = io->port_data;
 123
 124         outb(0, ps2if->base);
 125
 126         free_irq(ps2if->dev->irq, ps2if);
 127 }
 128
 129 static int pcips2_probe(struct pci_dev *dev, const struct pci_device_id *id)
 130 {
 131         struct pcips2_data *ps2if;
 132         struct serio *serio;
 133         int ret;
 134
 135         ret = pci_enable_device(dev);
 136         if (ret)
 137                 goto out;
 138
 139         ret = pci_request_regions(dev, "pcips2");
 140         if (ret)
 141                 goto disable;
 142
 143         ps2if = kzalloc(sizeof(struct pcips2_data), GFP_KERNEL);
 144         serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 145         if (!ps2if || !serio) {
 146                 ret = -ENOMEM;
 147                 goto release;
 148         }
 149
 150
 151         serio->id.type          = SERIO_8042;
 152         serio->write            = pcips2_write;
 153         serio->open             = pcips2_open;
 154         serio->close            = pcips2_close;
 155         strlcpy(serio->name, pci_name(dev), sizeof(serio->name));
 156         strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
 157         serio->port_data        = ps2if;
 158         serio->dev.parent       = &dev->dev;
 159         ps2if->io               = serio;
 160         ps2if->dev              = dev;
 161         ps2if->base             = pci_resource_start(dev, 0);
 162
 163         pci_set_drvdata(dev, ps2if);
 164
 165         serio_register_port(ps2if->io);
 166         return 0;
 167
 168  release:
 169         kfree(ps2if);
 170         kfree(serio);
 171         pci_release_regions(dev);
 172  disable:
 173         pci_disable_device(dev);
 174  out:
 175         return ret;
 176 }
 177
 178 static void pcips2_remove(struct pci_dev *dev)
 179 {
 180         struct pcips2_data *ps2if = pci_get_drvdata(dev);
 181
 182         serio_unregister_port(ps2if->io);
 183         kfree(ps2if);
 184         pci_release_regions(dev);
 185         pci_disable_device(dev);
 186 }
 187
 188 static const struct pci_device_id pcips2_ids[] = {
 189         {
 190                 .vendor         = 0x14f2,       /* MOBILITY */
 191                 .device         = 0x0123,       /* Keyboard */
 192                 .subvendor      = PCI_ANY_ID,
 193                 .subdevice      = PCI_ANY_ID,
 194                 .class          = PCI_CLASS_INPUT_KEYBOARD << 8,
 195                 .class_mask     = 0xffff00,
 196         },
 197         {
 198                 .vendor         = 0x14f2,       /* MOBILITY */
 199                 .device         = 0x0124,       /* Mouse */
 200                 .subvendor      = PCI_ANY_ID,
 201                 .subdevice      = PCI_ANY_ID,
 202                 .class          = PCI_CLASS_INPUT_MOUSE << 8,
 203                 .class_mask     = 0xffff00,
 204         },
 205         { 0, }
 206 };
 207 MODULE_DEVICE_TABLE(pci, pcips2_ids);
 208
 209 static struct pci_driver pcips2_driver = {
 210         .name                   = "pcips2",
 211         .id_table               = pcips2_ids,
 212         .probe                  = pcips2_probe,
 213         .remove                 = pcips2_remove,
 214 };
 215
 216 module_pci_driver(pcips2_driver);
 217
 218 MODULE_LICENSE("GPL");
 219 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
 220 MODULE_DESCRIPTION("PCI PS/2 keyboard/mouse driver");