399 lines
8.5 KiB
C
399 lines
8.5 KiB
C
/*
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* linux/drivers/hil/hilkbd.c
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*
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* Copyright (C) 1998 Philip Blundell <philb@gnu.org>
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* Copyright (C) 1999 Matthew Wilcox <willy@bofh.ai>
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* Copyright (C) 1999-2007 Helge Deller <deller@gmx.de>
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*
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* Very basic HP Human Interface Loop (HIL) driver.
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* This driver handles the keyboard on HP300 (m68k) and on some
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* HP700 (parisc) series machines.
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*
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License version 2. See the file COPYING in the main directory of this
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* archive for more details.
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*/
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#include <linux/pci_ids.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/input.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/hil.h>
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#include <linux/io.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <asm/irq.h>
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#ifdef CONFIG_HP300
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#include <asm/hwtest.h>
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#endif
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MODULE_AUTHOR("Philip Blundell, Matthew Wilcox, Helge Deller");
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MODULE_DESCRIPTION("HIL keyboard driver (basic functionality)");
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MODULE_LICENSE("GPL v2");
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#if defined(CONFIG_PARISC)
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#include <asm/io.h>
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#include <asm/hardware.h>
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#include <asm/parisc-device.h>
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static unsigned long hil_base; /* HPA for the HIL device */
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static unsigned int hil_irq;
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#define HILBASE hil_base /* HPPA (parisc) port address */
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#define HIL_DATA 0x800
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#define HIL_CMD 0x801
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#define HIL_IRQ hil_irq
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#define hil_readb(p) gsc_readb(p)
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#define hil_writeb(v,p) gsc_writeb((v),(p))
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#elif defined(CONFIG_HP300)
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#define HILBASE 0xf0428000UL /* HP300 (m68k) port address */
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#define HIL_DATA 0x1
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#define HIL_CMD 0x3
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#define HIL_IRQ 2
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#define hil_readb(p) readb(p)
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#define hil_writeb(v,p) writeb((v),(p))
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#else
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#error "HIL is not supported on this platform"
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#endif
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/* HIL helper functions */
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#define hil_busy() (hil_readb(HILBASE + HIL_CMD) & HIL_BUSY)
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#define hil_data_available() (hil_readb(HILBASE + HIL_CMD) & HIL_DATA_RDY)
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#define hil_status() (hil_readb(HILBASE + HIL_CMD))
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#define hil_command(x) do { hil_writeb((x), HILBASE + HIL_CMD); } while (0)
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#define hil_read_data() (hil_readb(HILBASE + HIL_DATA))
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#define hil_write_data(x) do { hil_writeb((x), HILBASE + HIL_DATA); } while (0)
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/* HIL constants */
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#define HIL_BUSY 0x02
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#define HIL_DATA_RDY 0x01
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#define HIL_SETARD 0xA0 /* set auto-repeat delay */
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#define HIL_SETARR 0xA2 /* set auto-repeat rate */
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#define HIL_SETTONE 0xA3 /* set tone generator */
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#define HIL_CNMT 0xB2 /* clear nmi */
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#define HIL_INTON 0x5C /* Turn on interrupts. */
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#define HIL_INTOFF 0x5D /* Turn off interrupts. */
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#define HIL_READKBDSADR 0xF9
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#define HIL_WRITEKBDSADR 0xE9
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static unsigned int hphilkeyb_keycode[HIL_KEYCODES_SET1_TBLSIZE] __read_mostly =
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{ HIL_KEYCODES_SET1 };
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/* HIL structure */
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static struct {
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struct input_dev *dev;
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unsigned int curdev;
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unsigned char s;
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unsigned char c;
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int valid;
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unsigned char data[16];
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unsigned int ptr;
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spinlock_t lock;
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void *dev_id; /* native bus device */
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} hil_dev;
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static void poll_finished(void)
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{
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int down;
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int key;
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unsigned char scode;
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switch (hil_dev.data[0]) {
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case 0x40:
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down = (hil_dev.data[1] & 1) == 0;
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scode = hil_dev.data[1] >> 1;
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key = hphilkeyb_keycode[scode];
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input_report_key(hil_dev.dev, key, down);
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break;
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}
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hil_dev.curdev = 0;
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}
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static inline void handle_status(unsigned char s, unsigned char c)
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{
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if (c & 0x8) {
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/* End of block */
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if (c & 0x10)
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poll_finished();
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} else {
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if (c & 0x10) {
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if (hil_dev.curdev)
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poll_finished(); /* just in case */
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hil_dev.curdev = c & 7;
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hil_dev.ptr = 0;
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}
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}
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}
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static inline void handle_data(unsigned char s, unsigned char c)
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{
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if (hil_dev.curdev) {
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hil_dev.data[hil_dev.ptr++] = c;
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hil_dev.ptr &= 15;
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}
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}
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/* handle HIL interrupts */
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static irqreturn_t hil_interrupt(int irq, void *handle)
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{
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unsigned char s, c;
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s = hil_status();
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c = hil_read_data();
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switch (s >> 4) {
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case 0x5:
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handle_status(s, c);
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break;
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case 0x6:
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handle_data(s, c);
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break;
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case 0x4:
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hil_dev.s = s;
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hil_dev.c = c;
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mb();
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hil_dev.valid = 1;
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break;
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}
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return IRQ_HANDLED;
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}
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/* send a command to the HIL */
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static void hil_do(unsigned char cmd, unsigned char *data, unsigned int len)
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{
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unsigned long flags;
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spin_lock_irqsave(&hil_dev.lock, flags);
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while (hil_busy())
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/* wait */;
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hil_command(cmd);
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while (len--) {
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while (hil_busy())
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/* wait */;
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hil_write_data(*(data++));
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}
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spin_unlock_irqrestore(&hil_dev.lock, flags);
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}
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/* initialize HIL */
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static int hil_keyb_init(void)
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{
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unsigned char c;
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unsigned int i, kbid;
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wait_queue_head_t hil_wait;
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int err;
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if (hil_dev.dev)
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return -ENODEV; /* already initialized */
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init_waitqueue_head(&hil_wait);
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spin_lock_init(&hil_dev.lock);
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hil_dev.dev = input_allocate_device();
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if (!hil_dev.dev)
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return -ENOMEM;
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err = request_irq(HIL_IRQ, hil_interrupt, 0, "hil", hil_dev.dev_id);
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if (err) {
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printk(KERN_ERR "HIL: Can't get IRQ\n");
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goto err1;
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}
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/* Turn on interrupts */
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hil_do(HIL_INTON, NULL, 0);
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/* Look for keyboards */
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hil_dev.valid = 0; /* clear any pending data */
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hil_do(HIL_READKBDSADR, NULL, 0);
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wait_event_interruptible_timeout(hil_wait, hil_dev.valid, 3 * HZ);
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if (!hil_dev.valid)
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printk(KERN_WARNING "HIL: timed out, assuming no keyboard present\n");
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c = hil_dev.c;
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hil_dev.valid = 0;
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if (c == 0) {
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kbid = -1;
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printk(KERN_WARNING "HIL: no keyboard present\n");
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} else {
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kbid = ffz(~c);
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printk(KERN_INFO "HIL: keyboard found at id %d\n", kbid);
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}
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/* set it to raw mode */
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c = 0;
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hil_do(HIL_WRITEKBDSADR, &c, 1);
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for (i = 0; i < HIL_KEYCODES_SET1_TBLSIZE; i++)
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if (hphilkeyb_keycode[i] != KEY_RESERVED)
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__set_bit(hphilkeyb_keycode[i], hil_dev.dev->keybit);
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hil_dev.dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
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hil_dev.dev->ledbit[0] = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
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BIT_MASK(LED_SCROLLL);
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hil_dev.dev->keycodemax = HIL_KEYCODES_SET1_TBLSIZE;
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hil_dev.dev->keycodesize= sizeof(hphilkeyb_keycode[0]);
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hil_dev.dev->keycode = hphilkeyb_keycode;
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hil_dev.dev->name = "HIL keyboard";
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hil_dev.dev->phys = "hpkbd/input0";
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hil_dev.dev->id.bustype = BUS_HIL;
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hil_dev.dev->id.vendor = PCI_VENDOR_ID_HP;
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hil_dev.dev->id.product = 0x0001;
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hil_dev.dev->id.version = 0x0010;
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err = input_register_device(hil_dev.dev);
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if (err) {
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printk(KERN_ERR "HIL: Can't register device\n");
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goto err2;
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}
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printk(KERN_INFO "input: %s, ID %d at 0x%08lx (irq %d) found and attached\n",
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hil_dev.dev->name, kbid, HILBASE, HIL_IRQ);
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return 0;
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err2:
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hil_do(HIL_INTOFF, NULL, 0);
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free_irq(HIL_IRQ, hil_dev.dev_id);
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err1:
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input_free_device(hil_dev.dev);
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hil_dev.dev = NULL;
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return err;
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}
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static void hil_keyb_exit(void)
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{
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if (HIL_IRQ)
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free_irq(HIL_IRQ, hil_dev.dev_id);
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/* Turn off interrupts */
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hil_do(HIL_INTOFF, NULL, 0);
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input_unregister_device(hil_dev.dev);
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hil_dev.dev = NULL;
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}
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#if defined(CONFIG_PARISC)
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static int hil_probe_chip(struct parisc_device *dev)
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{
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/* Only allow one HIL keyboard */
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if (hil_dev.dev)
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return -ENODEV;
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if (!dev->irq) {
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printk(KERN_WARNING "HIL: IRQ not found for HIL bus at 0x%p\n",
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(void *)dev->hpa.start);
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return -ENODEV;
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}
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hil_base = dev->hpa.start;
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hil_irq = dev->irq;
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hil_dev.dev_id = dev;
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printk(KERN_INFO "Found HIL bus at 0x%08lx, IRQ %d\n", hil_base, hil_irq);
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return hil_keyb_init();
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}
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static int hil_remove_chip(struct parisc_device *dev)
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{
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hil_keyb_exit();
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return 0;
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}
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static struct parisc_device_id hil_tbl[] = {
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{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00073 },
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{ 0, }
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};
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#if 0
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/* Disabled to avoid conflicts with the HP SDC HIL drivers */
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MODULE_DEVICE_TABLE(parisc, hil_tbl);
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#endif
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static struct parisc_driver hil_driver = {
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.name = "hil",
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.id_table = hil_tbl,
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.probe = hil_probe_chip,
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.remove = hil_remove_chip,
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};
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static int __init hil_init(void)
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{
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return register_parisc_driver(&hil_driver);
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}
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static void __exit hil_exit(void)
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{
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unregister_parisc_driver(&hil_driver);
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}
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#else /* !CONFIG_PARISC */
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static int __init hil_init(void)
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{
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int error;
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/* Only allow one HIL keyboard */
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if (hil_dev.dev)
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return -EBUSY;
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if (!MACH_IS_HP300)
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return -ENODEV;
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if (!hwreg_present((void *)(HILBASE + HIL_DATA))) {
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printk(KERN_ERR "HIL: hardware register was not found\n");
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return -ENODEV;
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}
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if (!request_region(HILBASE + HIL_DATA, 2, "hil")) {
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printk(KERN_ERR "HIL: IOPORT region already used\n");
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return -EIO;
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}
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error = hil_keyb_init();
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if (error) {
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release_region(HILBASE + HIL_DATA, 2);
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return error;
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}
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return 0;
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}
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static void __exit hil_exit(void)
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{
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hil_keyb_exit();
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release_region(HILBASE + HIL_DATA, 2);
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}
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#endif /* CONFIG_PARISC */
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module_init(hil_init);
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module_exit(hil_exit);
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