Merge commit 'v2.6.26-rc8' into x86/mce
[linux-2.6] / drivers / input / keyboard / hilkbd.c
1 /*
2  *  linux/drivers/hil/hilkbd.c
3  *
4  *  Copyright (C) 1998 Philip Blundell <philb@gnu.org>
5  *  Copyright (C) 1999 Matthew Wilcox <willy@bofh.ai>
6  *  Copyright (C) 1999-2007 Helge Deller <deller@gmx.de>
7  *
8  *  Very basic HP Human Interface Loop (HIL) driver.
9  *  This driver handles the keyboard on HP300 (m68k) and on some
10  *  HP700 (parisc) series machines.
11  *
12  *
13  * This file is subject to the terms and conditions of the GNU General Public
14  * License version 2.  See the file COPYING in the main directory of this
15  * archive for more details.
16  */
17
18 #include <linux/pci_ids.h>
19 #include <linux/ioport.h>
20 #include <linux/module.h>
21 #include <linux/errno.h>
22 #include <linux/input.h>
23 #include <linux/init.h>
24 #include <linux/interrupt.h>
25 #include <linux/hil.h>
26 #include <linux/io.h>
27 #include <linux/spinlock.h>
28 #include <asm/irq.h>
29 #ifdef CONFIG_HP300
30 #include <asm/hwtest.h>
31 #endif
32
33
34 MODULE_AUTHOR("Philip Blundell, Matthew Wilcox, Helge Deller");
35 MODULE_DESCRIPTION("HIL keyboard driver (basic functionality)");
36 MODULE_LICENSE("GPL v2");
37
38
39 #if defined(CONFIG_PARISC)
40
41  #include <asm/io.h>
42  #include <asm/hardware.h>
43  #include <asm/parisc-device.h>
44  static unsigned long hil_base; /* HPA for the HIL device */
45  static unsigned int hil_irq;
46  #define HILBASE                hil_base /* HPPA (parisc) port address */
47  #define HIL_DATA               0x800
48  #define HIL_CMD                0x801
49  #define HIL_IRQ                hil_irq
50  #define hil_readb(p)           gsc_readb(p)
51  #define hil_writeb(v,p)        gsc_writeb((v),(p))
52
53 #elif defined(CONFIG_HP300)
54
55  #define HILBASE                0xf0428000UL /* HP300 (m68k) port address */
56  #define HIL_DATA               0x1
57  #define HIL_CMD                0x3
58  #define HIL_IRQ                2
59  #define hil_readb(p)           readb(p)
60  #define hil_writeb(v,p)        writeb((v),(p))
61
62 #else
63 #error "HIL is not supported on this platform"
64 #endif
65
66
67
68 /* HIL helper functions */
69
70 #define hil_busy()              (hil_readb(HILBASE + HIL_CMD) & HIL_BUSY)
71 #define hil_data_available()    (hil_readb(HILBASE + HIL_CMD) & HIL_DATA_RDY)
72 #define hil_status()            (hil_readb(HILBASE + HIL_CMD))
73 #define hil_command(x)          do { hil_writeb((x), HILBASE + HIL_CMD); } while (0)
74 #define hil_read_data()         (hil_readb(HILBASE + HIL_DATA))
75 #define hil_write_data(x)       do { hil_writeb((x), HILBASE + HIL_DATA); } while (0)
76
77 /* HIL constants */
78
79 #define HIL_BUSY                0x02
80 #define HIL_DATA_RDY            0x01
81
82 #define HIL_SETARD              0xA0            /* set auto-repeat delay */
83 #define HIL_SETARR              0xA2            /* set auto-repeat rate */
84 #define HIL_SETTONE             0xA3            /* set tone generator */
85 #define HIL_CNMT                0xB2            /* clear nmi */
86 #define HIL_INTON               0x5C            /* Turn on interrupts. */
87 #define HIL_INTOFF              0x5D            /* Turn off interrupts. */
88
89 #define HIL_READKBDSADR         0xF9
90 #define HIL_WRITEKBDSADR        0xE9
91
92 static unsigned int hphilkeyb_keycode[HIL_KEYCODES_SET1_TBLSIZE] __read_mostly =
93         { HIL_KEYCODES_SET1 };
94
95 /* HIL structure */
96 static struct {
97         struct input_dev *dev;
98
99         unsigned int curdev;
100
101         unsigned char s;
102         unsigned char c;
103         int valid;
104
105         unsigned char data[16];
106         unsigned int ptr;
107         spinlock_t lock;
108
109         void *dev_id;   /* native bus device */
110 } hil_dev;
111
112
113 static void poll_finished(void)
114 {
115         int down;
116         int key;
117         unsigned char scode;
118
119         switch (hil_dev.data[0]) {
120         case 0x40:
121                 down = (hil_dev.data[1] & 1) == 0;
122                 scode = hil_dev.data[1] >> 1;
123                 key = hphilkeyb_keycode[scode];
124                 input_report_key(hil_dev.dev, key, down);
125                 break;
126         }
127         hil_dev.curdev = 0;
128 }
129
130
131 static inline void handle_status(unsigned char s, unsigned char c)
132 {
133         if (c & 0x8) {
134                 /* End of block */
135                 if (c & 0x10)
136                         poll_finished();
137         } else {
138                 if (c & 0x10) {
139                         if (hil_dev.curdev)
140                                 poll_finished();  /* just in case */
141                         hil_dev.curdev = c & 7;
142                         hil_dev.ptr = 0;
143                 }
144         }
145 }
146
147
148 static inline void handle_data(unsigned char s, unsigned char c)
149 {
150         if (hil_dev.curdev) {
151                 hil_dev.data[hil_dev.ptr++] = c;
152                 hil_dev.ptr &= 15;
153         }
154 }
155
156
157 /* handle HIL interrupts */
158 static irqreturn_t hil_interrupt(int irq, void *handle)
159 {
160         unsigned char s, c;
161
162         s = hil_status();
163         c = hil_read_data();
164
165         switch (s >> 4) {
166         case 0x5:
167                 handle_status(s, c);
168                 break;
169         case 0x6:
170                 handle_data(s, c);
171                 break;
172         case 0x4:
173                 hil_dev.s = s;
174                 hil_dev.c = c;
175                 mb();
176                 hil_dev.valid = 1;
177                 break;
178         }
179         return IRQ_HANDLED;
180 }
181
182
183 /* send a command to the HIL */
184 static void hil_do(unsigned char cmd, unsigned char *data, unsigned int len)
185 {
186         unsigned long flags;
187
188         spin_lock_irqsave(&hil_dev.lock, flags);
189         while (hil_busy())
190                 /* wait */;
191         hil_command(cmd);
192         while (len--) {
193                 while (hil_busy())
194                         /* wait */;
195                 hil_write_data(*(data++));
196         }
197         spin_unlock_irqrestore(&hil_dev.lock, flags);
198 }
199
200
201 /* initialise HIL */
202 static int __init
203 hil_keyb_init(void)
204 {
205         unsigned char c;
206         unsigned int i, kbid;
207         wait_queue_head_t hil_wait;
208         int err;
209
210         if (hil_dev.dev) {
211                 return -ENODEV; /* already initialized */
212         }
213
214         spin_lock_init(&hil_dev.lock);
215         hil_dev.dev = input_allocate_device();
216         if (!hil_dev.dev)
217                 return -ENOMEM;
218
219 #if defined(CONFIG_HP300)
220         if (!MACH_IS_HP300) {
221                 err = -ENODEV;
222                 goto err1;
223         }
224         if (!hwreg_present((void *)(HILBASE + HIL_DATA))) {
225                 printk(KERN_ERR "HIL: hardware register was not found\n");
226                 err = -ENODEV;
227                 goto err1;
228         }
229         if (!request_region(HILBASE + HIL_DATA, 2, "hil")) {
230                 printk(KERN_ERR "HIL: IOPORT region already used\n");
231                 err = -EIO;
232                 goto err1;
233         }
234 #endif
235
236         err = request_irq(HIL_IRQ, hil_interrupt, 0, "hil", hil_dev.dev_id);
237         if (err) {
238                 printk(KERN_ERR "HIL: Can't get IRQ\n");
239                 goto err2;
240         }
241
242         /* Turn on interrupts */
243         hil_do(HIL_INTON, NULL, 0);
244
245         /* Look for keyboards */
246         hil_dev.valid = 0;      /* clear any pending data */
247         hil_do(HIL_READKBDSADR, NULL, 0);
248
249         init_waitqueue_head(&hil_wait);
250         wait_event_interruptible_timeout(hil_wait, hil_dev.valid, 3*HZ);
251         if (!hil_dev.valid) {
252                 printk(KERN_WARNING "HIL: timed out, assuming no keyboard present\n");
253         }
254
255         c = hil_dev.c;
256         hil_dev.valid = 0;
257         if (c == 0) {
258                 kbid = -1;
259                 printk(KERN_WARNING "HIL: no keyboard present\n");
260         } else {
261                 kbid = ffz(~c);
262                 printk(KERN_INFO "HIL: keyboard found at id %d\n", kbid);
263         }
264
265         /* set it to raw mode */
266         c = 0;
267         hil_do(HIL_WRITEKBDSADR, &c, 1);
268
269         for (i = 0; i < HIL_KEYCODES_SET1_TBLSIZE; i++)
270                 if (hphilkeyb_keycode[i] != KEY_RESERVED)
271                         set_bit(hphilkeyb_keycode[i], hil_dev.dev->keybit);
272
273         hil_dev.dev->evbit[0]   = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
274         hil_dev.dev->ledbit[0]  = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
275                 BIT_MASK(LED_SCROLLL);
276         hil_dev.dev->keycodemax = HIL_KEYCODES_SET1_TBLSIZE;
277         hil_dev.dev->keycodesize= sizeof(hphilkeyb_keycode[0]);
278         hil_dev.dev->keycode    = hphilkeyb_keycode;
279         hil_dev.dev->name       = "HIL keyboard";
280         hil_dev.dev->phys       = "hpkbd/input0";
281
282         hil_dev.dev->id.bustype = BUS_HIL;
283         hil_dev.dev->id.vendor  = PCI_VENDOR_ID_HP;
284         hil_dev.dev->id.product = 0x0001;
285         hil_dev.dev->id.version = 0x0010;
286
287         err = input_register_device(hil_dev.dev);
288         if (err) {
289                 printk(KERN_ERR "HIL: Can't register device\n");
290                 goto err3;
291         }
292         printk(KERN_INFO "input: %s, ID %d at 0x%08lx (irq %d) found and attached\n",
293                hil_dev.dev->name, kbid, HILBASE, HIL_IRQ);
294
295         return 0;
296
297 err3:
298         hil_do(HIL_INTOFF, NULL, 0);
299         disable_irq(HIL_IRQ);
300         free_irq(HIL_IRQ, hil_dev.dev_id);
301 err2:
302 #if defined(CONFIG_HP300)
303         release_region(HILBASE + HIL_DATA, 2);
304 err1:
305 #endif
306         input_free_device(hil_dev.dev);
307         hil_dev.dev = NULL;
308         return err;
309 }
310
311
312 #if defined(CONFIG_PARISC)
313 static int __init
314 hil_init_chip(struct parisc_device *dev)
315 {
316         if (!dev->irq) {
317                 printk(KERN_WARNING "HIL: IRQ not found for HIL bus at 0x%08lx\n", dev->hpa.start);
318                 return -ENODEV;
319         }
320
321         hil_base = dev->hpa.start;
322         hil_irq  = dev->irq;
323         hil_dev.dev_id = dev;
324
325         printk(KERN_INFO "Found HIL bus at 0x%08lx, IRQ %d\n", hil_base, hil_irq);
326
327         return hil_keyb_init();
328 }
329
330 static struct parisc_device_id hil_tbl[] = {
331         { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00073 },
332         { 0, }
333 };
334
335 MODULE_DEVICE_TABLE(parisc, hil_tbl);
336
337 static struct parisc_driver hil_driver = {
338         .name =         "hil",
339         .id_table =     hil_tbl,
340         .probe =        hil_init_chip,
341 };
342 #endif /* CONFIG_PARISC */
343
344
345 static int __init hil_init(void)
346 {
347 #if defined(CONFIG_PARISC)
348         return register_parisc_driver(&hil_driver);
349 #else
350         return hil_keyb_init();
351 #endif
352 }
353
354
355 static void __exit hil_exit(void)
356 {
357         if (HIL_IRQ) {
358                 disable_irq(HIL_IRQ);
359                 free_irq(HIL_IRQ, hil_dev.dev_id);
360         }
361
362         /* Turn off interrupts */
363         hil_do(HIL_INTOFF, NULL, 0);
364
365         input_unregister_device(hil_dev.dev);
366
367         hil_dev.dev = NULL;
368
369 #if defined(CONFIG_PARISC)
370         unregister_parisc_driver(&hil_driver);
371 #else
372         release_region(HILBASE+HIL_DATA, 2);
373 #endif
374 }
375
376 module_init(hil_init);
377 module_exit(hil_exit);