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Linux/drivers/input/keyboard/sunkbd.c

  1 /*
  2  *  Copyright (c) 1999-2001 Vojtech Pavlik
  3  */
  4 
  5 /*
  6  * Sun keyboard driver for Linux
  7  */
  8 
  9 /*
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or
 13  * (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  * GNU General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, write to the Free Software
 22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 23  *
 24  * Should you need to contact me, the author, you can do so either by
 25  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 26  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 27  */
 28 
 29 #include <linux/delay.h>
 30 #include <linux/sched.h>
 31 #include <linux/slab.h>
 32 #include <linux/module.h>
 33 #include <linux/interrupt.h>
 34 #include <linux/input.h>
 35 #include <linux/serio.h>
 36 #include <linux/workqueue.h>
 37 
 38 #define DRIVER_DESC     "Sun keyboard driver"
 39 
 40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 41 MODULE_DESCRIPTION(DRIVER_DESC);
 42 MODULE_LICENSE("GPL");
 43 
 44 static unsigned char sunkbd_keycode[128] = {
 45           0,128,114,129,115, 59, 60, 68, 61, 87, 62, 88, 63,100, 64,112,
 46          65, 66, 67, 56,103,119, 99, 70,105,130,131,108,106,  1,  2,  3,
 47           4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 41, 14,110,113, 98, 55,
 48         116,132, 83,133,102, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
 49          26, 27,111,127, 71, 72, 73, 74,134,135,107,  0, 29, 30, 31, 32,
 50          33, 34, 35, 36, 37, 38, 39, 40, 43, 28, 96, 75, 76, 77, 82,136,
 51         104,137, 69, 42, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54,101,
 52          79, 80, 81,  0,  0,  0,138, 58,125, 57,126,109, 86, 78
 53 };
 54 
 55 #define SUNKBD_CMD_RESET        0x1
 56 #define SUNKBD_CMD_BELLON       0x2
 57 #define SUNKBD_CMD_BELLOFF      0x3
 58 #define SUNKBD_CMD_CLICK        0xa
 59 #define SUNKBD_CMD_NOCLICK      0xb
 60 #define SUNKBD_CMD_SETLED       0xe
 61 #define SUNKBD_CMD_LAYOUT       0xf
 62 
 63 #define SUNKBD_RET_RESET        0xff
 64 #define SUNKBD_RET_ALLUP        0x7f
 65 #define SUNKBD_RET_LAYOUT       0xfe
 66 
 67 #define SUNKBD_LAYOUT_5_MASK    0x20
 68 #define SUNKBD_RELEASE          0x80
 69 #define SUNKBD_KEY              0x7f
 70 
 71 /*
 72  * Per-keyboard data.
 73  */
 74 
 75 struct sunkbd {
 76         unsigned char keycode[ARRAY_SIZE(sunkbd_keycode)];
 77         struct input_dev *dev;
 78         struct serio *serio;
 79         struct work_struct tq;
 80         wait_queue_head_t wait;
 81         char name[64];
 82         char phys[32];
 83         char type;
 84         bool enabled;
 85         volatile s8 reset;
 86         volatile s8 layout;
 87 };
 88 
 89 /*
 90  * sunkbd_interrupt() is called by the low level driver when a character
 91  * is received.
 92  */
 93 
 94 static irqreturn_t sunkbd_interrupt(struct serio *serio,
 95                 unsigned char data, unsigned int flags)
 96 {
 97         struct sunkbd *sunkbd = serio_get_drvdata(serio);
 98 
 99         if (sunkbd->reset <= -1) {
100                 /*
101                  * If cp[i] is 0xff, sunkbd->reset will stay -1.
102                  * The keyboard sends 0xff 0xff 0xID on powerup.
103                  */
104                 sunkbd->reset = data;
105                 wake_up_interruptible(&sunkbd->wait);
106                 goto out;
107         }
108 
109         if (sunkbd->layout == -1) {
110                 sunkbd->layout = data;
111                 wake_up_interruptible(&sunkbd->wait);
112                 goto out;
113         }
114 
115         switch (data) {
116 
117         case SUNKBD_RET_RESET:
118                 schedule_work(&sunkbd->tq);
119                 sunkbd->reset = -1;
120                 break;
121 
122         case SUNKBD_RET_LAYOUT:
123                 sunkbd->layout = -1;
124                 break;
125 
126         case SUNKBD_RET_ALLUP: /* All keys released */
127                 break;
128 
129         default:
130                 if (!sunkbd->enabled)
131                         break;
132 
133                 if (sunkbd->keycode[data & SUNKBD_KEY]) {
134                         input_report_key(sunkbd->dev,
135                                          sunkbd->keycode[data & SUNKBD_KEY],
136                                          !(data & SUNKBD_RELEASE));
137                         input_sync(sunkbd->dev);
138                 } else {
139                         printk(KERN_WARNING
140                                 "sunkbd.c: Unknown key (scancode %#x) %s.\n",
141                                 data & SUNKBD_KEY,
142                                 data & SUNKBD_RELEASE ? "released" : "pressed");
143                 }
144         }
145 out:
146         return IRQ_HANDLED;
147 }
148 
149 /*
150  * sunkbd_event() handles events from the input module.
151  */
152 
153 static int sunkbd_event(struct input_dev *dev,
154                         unsigned int type, unsigned int code, int value)
155 {
156         struct sunkbd *sunkbd = input_get_drvdata(dev);
157 
158         switch (type) {
159 
160         case EV_LED:
161 
162                 serio_write(sunkbd->serio, SUNKBD_CMD_SETLED);
163                 serio_write(sunkbd->serio,
164                         (!!test_bit(LED_CAPSL,   dev->led) << 3) |
165                         (!!test_bit(LED_SCROLLL, dev->led) << 2) |
166                         (!!test_bit(LED_COMPOSE, dev->led) << 1) |
167                          !!test_bit(LED_NUML,    dev->led));
168                 return 0;
169 
170         case EV_SND:
171 
172                 switch (code) {
173 
174                 case SND_CLICK:
175                         serio_write(sunkbd->serio, SUNKBD_CMD_NOCLICK - value);
176                         return 0;
177 
178                 case SND_BELL:
179                         serio_write(sunkbd->serio, SUNKBD_CMD_BELLOFF - value);
180                         return 0;
181                 }
182 
183                 break;
184         }
185 
186         return -1;
187 }
188 
189 /*
190  * sunkbd_initialize() checks for a Sun keyboard attached, and determines
191  * its type.
192  */
193 
194 static int sunkbd_initialize(struct sunkbd *sunkbd)
195 {
196         sunkbd->reset = -2;
197         serio_write(sunkbd->serio, SUNKBD_CMD_RESET);
198         wait_event_interruptible_timeout(sunkbd->wait, sunkbd->reset >= 0, HZ);
199         if (sunkbd->reset < 0)
200                 return -1;
201 
202         sunkbd->type = sunkbd->reset;
203 
204         if (sunkbd->type == 4) {        /* Type 4 keyboard */
205                 sunkbd->layout = -2;
206                 serio_write(sunkbd->serio, SUNKBD_CMD_LAYOUT);
207                 wait_event_interruptible_timeout(sunkbd->wait,
208                                                  sunkbd->layout >= 0, HZ / 4);
209                 if (sunkbd->layout < 0)
210                         return -1;
211                 if (sunkbd->layout & SUNKBD_LAYOUT_5_MASK)
212                         sunkbd->type = 5;
213         }
214 
215         return 0;
216 }
217 
218 /*
219  * sunkbd_reinit() sets leds and beeps to a state the computer remembers they
220  * were in.
221  */
222 
223 static void sunkbd_reinit(struct work_struct *work)
224 {
225         struct sunkbd *sunkbd = container_of(work, struct sunkbd, tq);
226 
227         wait_event_interruptible_timeout(sunkbd->wait, sunkbd->reset >= 0, HZ);
228 
229         serio_write(sunkbd->serio, SUNKBD_CMD_SETLED);
230         serio_write(sunkbd->serio,
231                 (!!test_bit(LED_CAPSL,   sunkbd->dev->led) << 3) |
232                 (!!test_bit(LED_SCROLLL, sunkbd->dev->led) << 2) |
233                 (!!test_bit(LED_COMPOSE, sunkbd->dev->led) << 1) |
234                  !!test_bit(LED_NUML,    sunkbd->dev->led));
235         serio_write(sunkbd->serio,
236                 SUNKBD_CMD_NOCLICK - !!test_bit(SND_CLICK, sunkbd->dev->snd));
237         serio_write(sunkbd->serio,
238                 SUNKBD_CMD_BELLOFF - !!test_bit(SND_BELL, sunkbd->dev->snd));
239 }
240 
241 static void sunkbd_enable(struct sunkbd *sunkbd, bool enable)
242 {
243         serio_pause_rx(sunkbd->serio);
244         sunkbd->enabled = enable;
245         serio_continue_rx(sunkbd->serio);
246 }
247 
248 /*
249  * sunkbd_connect() probes for a Sun keyboard and fills the necessary
250  * structures.
251  */
252 
253 static int sunkbd_connect(struct serio *serio, struct serio_driver *drv)
254 {
255         struct sunkbd *sunkbd;
256         struct input_dev *input_dev;
257         int err = -ENOMEM;
258         int i;
259 
260         sunkbd = kzalloc(sizeof(struct sunkbd), GFP_KERNEL);
261         input_dev = input_allocate_device();
262         if (!sunkbd || !input_dev)
263                 goto fail1;
264 
265         sunkbd->serio = serio;
266         sunkbd->dev = input_dev;
267         init_waitqueue_head(&sunkbd->wait);
268         INIT_WORK(&sunkbd->tq, sunkbd_reinit);
269         snprintf(sunkbd->phys, sizeof(sunkbd->phys), "%s/input0", serio->phys);
270 
271         serio_set_drvdata(serio, sunkbd);
272 
273         err = serio_open(serio, drv);
274         if (err)
275                 goto fail2;
276 
277         if (sunkbd_initialize(sunkbd) < 0) {
278                 err = -ENODEV;
279                 goto fail3;
280         }
281 
282         snprintf(sunkbd->name, sizeof(sunkbd->name),
283                  "Sun Type %d keyboard", sunkbd->type);
284         memcpy(sunkbd->keycode, sunkbd_keycode, sizeof(sunkbd->keycode));
285 
286         input_dev->name = sunkbd->name;
287         input_dev->phys = sunkbd->phys;
288         input_dev->id.bustype = BUS_RS232;
289         input_dev->id.vendor  = SERIO_SUNKBD;
290         input_dev->id.product = sunkbd->type;
291         input_dev->id.version = 0x0100;
292         input_dev->dev.parent = &serio->dev;
293 
294         input_set_drvdata(input_dev, sunkbd);
295 
296         input_dev->event = sunkbd_event;
297 
298         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_LED) |
299                 BIT_MASK(EV_SND) | BIT_MASK(EV_REP);
300         input_dev->ledbit[0] = BIT_MASK(LED_CAPSL) | BIT_MASK(LED_COMPOSE) |
301                 BIT_MASK(LED_SCROLLL) | BIT_MASK(LED_NUML);
302         input_dev->sndbit[0] = BIT_MASK(SND_CLICK) | BIT_MASK(SND_BELL);
303 
304         input_dev->keycode = sunkbd->keycode;
305         input_dev->keycodesize = sizeof(unsigned char);
306         input_dev->keycodemax = ARRAY_SIZE(sunkbd_keycode);
307         for (i = 0; i < ARRAY_SIZE(sunkbd_keycode); i++)
308                 __set_bit(sunkbd->keycode[i], input_dev->keybit);
309         __clear_bit(KEY_RESERVED, input_dev->keybit);
310 
311         sunkbd_enable(sunkbd, true);
312 
313         err = input_register_device(sunkbd->dev);
314         if (err)
315                 goto fail4;
316 
317         return 0;
318 
319  fail4: sunkbd_enable(sunkbd, false);
320  fail3: serio_close(serio);
321  fail2: serio_set_drvdata(serio, NULL);
322  fail1: input_free_device(input_dev);
323         kfree(sunkbd);
324         return err;
325 }
326 
327 /*
328  * sunkbd_disconnect() unregisters and closes behind us.
329  */
330 
331 static void sunkbd_disconnect(struct serio *serio)
332 {
333         struct sunkbd *sunkbd = serio_get_drvdata(serio);
334 
335         sunkbd_enable(sunkbd, false);
336         input_unregister_device(sunkbd->dev);
337         serio_close(serio);
338         serio_set_drvdata(serio, NULL);
339         kfree(sunkbd);
340 }
341 
342 static struct serio_device_id sunkbd_serio_ids[] = {
343         {
344                 .type   = SERIO_RS232,
345                 .proto  = SERIO_SUNKBD,
346                 .id     = SERIO_ANY,
347                 .extra  = SERIO_ANY,
348         },
349         {
350                 .type   = SERIO_RS232,
351                 .proto  = SERIO_UNKNOWN, /* sunkbd does probe */
352                 .id     = SERIO_ANY,
353                 .extra  = SERIO_ANY,
354         },
355         { 0 }
356 };
357 
358 MODULE_DEVICE_TABLE(serio, sunkbd_serio_ids);
359 
360 static struct serio_driver sunkbd_drv = {
361         .driver         = {
362                 .name   = "sunkbd",
363         },
364         .description    = DRIVER_DESC,
365         .id_table       = sunkbd_serio_ids,
366         .interrupt      = sunkbd_interrupt,
367         .connect        = sunkbd_connect,
368         .disconnect     = sunkbd_disconnect,
369 };
370 
371 module_serio_driver(sunkbd_drv);
372 

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