aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/keyboard/hilkbd.c
blob: 50d80ecf0b80915ee81d2ab5c59b01be9cb1c4b7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
/*
 *  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);