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hilkbd.c

/*
 *  linux/drivers/hil/hilkbd.c
 *
 *  Copyright (C) 1998 Philip Blundell <philb@gnu.org>
 *  Copyright (C) 1999 Matthew Wilcox <willy@bofh.ai>
 *  Copyright (C) 1999-2007 Helge Deller <deller@gmx.de>
 *
 *  Very basic HP Human Interface Loop (HIL) driver.
 *  This driver handles the keyboard on HP300 (m68k) and on some
 *  HP700 (parisc) series machines.
 *
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License version 2.  See the file COPYING in the main directory of this
 * archive for more details.
 */

#include <linux/pci_ids.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/hil.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <asm/irq.h>
#ifdef CONFIG_HP300
#include <asm/hwtest.h>
#endif


MODULE_AUTHOR("Philip Blundell, Matthew Wilcox, Helge Deller");
MODULE_DESCRIPTION("HIL keyboard driver (basic functionality)");
MODULE_LICENSE("GPL v2");


#if defined(CONFIG_PARISC)

 #include <asm/io.h>
 #include <asm/hardware.h>
 #include <asm/parisc-device.h>
 static unsigned long hil_base;     /* HPA for the HIL device */
 static unsigned int hil_irq;
 #define HILBASE        hil_base /* HPPA (parisc) port address */
 #define HIL_DATA       0x800
 #define HIL_CMD        0x801
 #define HIL_IRQ        hil_irq
 #define hil_readb(p)         gsc_readb(p)
 #define hil_writeb(v,p)      gsc_writeb((v),(p))

#elif defined(CONFIG_HP300)

 #define HILBASE        0xf0428000UL /* HP300 (m68k) port address */
 #define HIL_DATA       0x1
 #define HIL_CMD        0x3
 #define HIL_IRQ        2
 #define hil_readb(p)         readb(p)
 #define hil_writeb(v,p)      writeb((v),(p))

#else
#error "HIL is not supported on this platform"
#endif



/* HIL helper functions */

#define hil_busy()              (hil_readb(HILBASE + HIL_CMD) & HIL_BUSY)
#define hil_data_available()    (hil_readb(HILBASE + HIL_CMD) & HIL_DATA_RDY)
#define hil_status()            (hil_readb(HILBASE + HIL_CMD))
#define hil_command(x)          do { hil_writeb((x), HILBASE + HIL_CMD); } while (0)
#define hil_read_data()         (hil_readb(HILBASE + HIL_DATA))
#define hil_write_data(x)       do { hil_writeb((x), HILBASE + HIL_DATA); } while (0)

/* HIL constants */

#define     HIL_BUSY          0x02
#define     HIL_DATA_RDY            0x01

#define     HIL_SETARD        0xA0        /* set auto-repeat delay */
#define     HIL_SETARR        0xA2        /* set auto-repeat rate */
#define     HIL_SETTONE       0xA3        /* set tone generator */
#define     HIL_CNMT          0xB2        /* clear nmi */
#define     HIL_INTON         0x5C        /* Turn on interrupts. */
#define     HIL_INTOFF        0x5D        /* Turn off interrupts. */

#define     HIL_READKBDSADR         0xF9
#define     HIL_WRITEKBDSADR  0xE9

static unsigned int hphilkeyb_keycode[HIL_KEYCODES_SET1_TBLSIZE] __read_mostly =
      { HIL_KEYCODES_SET1 };

/* HIL structure */
static struct {
      struct input_dev *dev;

      unsigned int curdev;

      unsigned char s;
      unsigned char c;
      int valid;

      unsigned char data[16];
      unsigned int ptr;
      spinlock_t lock;

      void *dev_id;     /* native bus device */
} hil_dev;


static void poll_finished(void)
{
      int down;
      int key;
      unsigned char scode;

      switch (hil_dev.data[0]) {
      case 0x40:
            down = (hil_dev.data[1] & 1) == 0;
            scode = hil_dev.data[1] >> 1;
            key = hphilkeyb_keycode[scode];
            input_report_key(hil_dev.dev, key, down);
            break;
      }
      hil_dev.curdev = 0;
}


static inline void handle_status(unsigned char s, unsigned char c)
{
      if (c & 0x8) {
            /* End of block */
            if (c & 0x10)
                  poll_finished();
      } else {
            if (c & 0x10) {
                  if (hil_dev.curdev)
                        poll_finished();  /* just in case */
                  hil_dev.curdev = c & 7;
                  hil_dev.ptr = 0;
            }
      }
}


static inline void handle_data(unsigned char s, unsigned char c)
{
      if (hil_dev.curdev) {
            hil_dev.data[hil_dev.ptr++] = c;
            hil_dev.ptr &= 15;
      }
}


/* handle HIL interrupts */
static irqreturn_t hil_interrupt(int irq, void *handle)
{
      unsigned char s, c;

      s = hil_status();
      c = hil_read_data();

      switch (s >> 4) {
      case 0x5:
            handle_status(s, c);
            break;
      case 0x6:
            handle_data(s, c);
            break;
      case 0x4:
            hil_dev.s = s;
            hil_dev.c = c;
            mb();
            hil_dev.valid = 1;
            break;
      }
      return IRQ_HANDLED;
}


/* send a command to the HIL */
static void hil_do(unsigned char cmd, unsigned char *data, unsigned int len)
{
      unsigned long flags;

      spin_lock_irqsave(&hil_dev.lock, flags);
      while (hil_busy())
            /* wait */;
      hil_command(cmd);
      while (len--) {
            while (hil_busy())
                  /* wait */;
            hil_write_data(*(data++));
      }
      spin_unlock_irqrestore(&hil_dev.lock, flags);
}


/* initialise HIL */
static int __init
hil_keyb_init(void)
{
      unsigned char c;
      unsigned int i, kbid;
      wait_queue_head_t hil_wait;
      int err;

      if (hil_dev.dev) {
            return -ENODEV; /* already initialized */
      }

      spin_lock_init(&hil_dev.lock);
      hil_dev.dev = input_allocate_device();
      if (!hil_dev.dev)
            return -ENOMEM;

#if defined(CONFIG_HP300)
      if (!hwreg_present((void *)(HILBASE + HIL_DATA))) {
            printk(KERN_ERR "HIL: hardware register was not found\n");
            err = -ENODEV;
            goto err1;
      }
      if (!request_region(HILBASE + HIL_DATA, 2, "hil")) {
            printk(KERN_ERR "HIL: IOPORT region already used\n");
            err = -EIO;
            goto err1;
      }
#endif

      err = request_irq(HIL_IRQ, hil_interrupt, 0, "hil", hil_dev.dev_id);
      if (err) {
            printk(KERN_ERR "HIL: Can't get IRQ\n");
            goto err2;
      }

      /* Turn on interrupts */
      hil_do(HIL_INTON, NULL, 0);

      /* Look for keyboards */
      hil_dev.valid = 0;      /* clear any pending data */
      hil_do(HIL_READKBDSADR, NULL, 0);

      init_waitqueue_head(&hil_wait);
      wait_event_interruptible_timeout(hil_wait, hil_dev.valid, 3*HZ);
      if (!hil_dev.valid) {
            printk(KERN_WARNING "HIL: timed out, assuming no keyboard present\n");
      }

      c = hil_dev.c;
      hil_dev.valid = 0;
      if (c == 0) {
            kbid = -1;
            printk(KERN_WARNING "HIL: no keyboard present\n");
      } else {
            kbid = ffz(~c);
            printk(KERN_INFO "HIL: keyboard found at id %d\n", kbid);
      }

      /* set it to raw mode */
      c = 0;
      hil_do(HIL_WRITEKBDSADR, &c, 1);

      for (i = 0; i < HIL_KEYCODES_SET1_TBLSIZE; i++)
            if (hphilkeyb_keycode[i] != KEY_RESERVED)
                  set_bit(hphilkeyb_keycode[i], hil_dev.dev->keybit);

      hil_dev.dev->evbit[0]   = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
      hil_dev.dev->ledbit[0]  = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
            BIT_MASK(LED_SCROLLL);
      hil_dev.dev->keycodemax = HIL_KEYCODES_SET1_TBLSIZE;
      hil_dev.dev->keycodesize= sizeof(hphilkeyb_keycode[0]);
      hil_dev.dev->keycode    = hphilkeyb_keycode;
      hil_dev.dev->name = "HIL keyboard";
      hil_dev.dev->phys = "hpkbd/input0";

      hil_dev.dev->id.bustype = BUS_HIL;
      hil_dev.dev->id.vendor  = PCI_VENDOR_ID_HP;
      hil_dev.dev->id.product = 0x0001;
      hil_dev.dev->id.version = 0x0010;

      err = input_register_device(hil_dev.dev);
      if (err) {
            printk(KERN_ERR "HIL: Can't register device\n");
            goto err3;
      }
      printk(KERN_INFO "input: %s, ID %d at 0x%08lx (irq %d) found and attached\n",
             hil_dev.dev->name, kbid, HILBASE, HIL_IRQ);

      return 0;

err3:
      hil_do(HIL_INTOFF, NULL, 0);
      disable_irq(HIL_IRQ);
      free_irq(HIL_IRQ, hil_dev.dev_id);
err2:
#if defined(CONFIG_HP300)
      release_region(HILBASE + HIL_DATA, 2);
err1:
#endif
      input_free_device(hil_dev.dev);
      hil_dev.dev = NULL;
      return err;
}


#if defined(CONFIG_PARISC)
static int __init
hil_init_chip(struct parisc_device *dev)
{
      if (!dev->irq) {
            printk(KERN_WARNING "HIL: IRQ not found for HIL bus at 0x%08lx\n", dev->hpa.start);
            return -ENODEV;
      }

      hil_base = dev->hpa.start;
      hil_irq  = dev->irq;
      hil_dev.dev_id = dev;

      printk(KERN_INFO "Found HIL bus at 0x%08lx, IRQ %d\n", hil_base, hil_irq);

      return hil_keyb_init();
}

static struct parisc_device_id hil_tbl[] = {
      { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00073 },
      { 0, }
};

MODULE_DEVICE_TABLE(parisc, hil_tbl);

static struct parisc_driver hil_driver = {
      .name =           "hil",
      .id_table = hil_tbl,
      .probe =    hil_init_chip,
};
#endif /* CONFIG_PARISC */


static int __init hil_init(void)
{
#if defined(CONFIG_PARISC)
      return register_parisc_driver(&hil_driver);
#else
      return hil_keyb_init();
#endif
}


static void __exit hil_exit(void)
{
      if (HIL_IRQ) {
            disable_irq(HIL_IRQ);
            free_irq(HIL_IRQ, hil_dev.dev_id);
      }

      /* Turn off interrupts */
      hil_do(HIL_INTOFF, NULL, 0);

      input_unregister_device(hil_dev.dev);

      hil_dev.dev = NULL;

#if defined(CONFIG_PARISC)
      unregister_parisc_driver(&hil_driver);
#else
      release_region(HILBASE+HIL_DATA, 2);
#endif
}

module_init(hil_init);
module_exit(hil_exit);

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