3 * keyboard input driver for i2c IR remote controls
5 * Copyright (c) 2000-2003 Gerd Knorr <kraxel@bytesex.org>
6 * modified for PixelView (BT878P+W/FM) by
7 * Michal Kochanowicz <mkochano@pld.org.pl>
8 * Christoph Bartelmus <lirc@bartelmus.de>
9 * modified for KNC ONE TV Station/Anubis Typhoon TView Tuner by
10 * Ulrich Mueller <ulrich.mueller42@web.de>
11 * modified for em2820 based USB TV tuners by
12 * Markus Rechberger <mrechberger@gmail.com>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/sched.h>
35 #include <linux/string.h>
36 #include <linux/timer.h>
37 #include <linux/delay.h>
38 #include <linux/errno.h>
39 #include <linux/slab.h>
40 #include <linux/i2c.h>
41 #include <linux/workqueue.h>
42 #include <asm/semaphore.h>
44 #include <media/ir-common.h>
45 #include <media/ir-kbd-i2c.h>
47 /* ----------------------------------------------------------------------- */
48 /* insmod parameters */
51 module_param(debug, int, 0644); /* debug level (0,1,2) */
53 static int hauppauge = 0;
54 module_param(hauppauge, int, 0644); /* Choose Hauppauge remote */
55 MODULE_PARM_DESC(hauppauge, "Specify Hauppauge remote: 0=black, 1=grey (defaults to 0)");
58 #define DEVNAME "ir-kbd-i2c"
59 #define dprintk(level, fmt, arg...) if (debug >= level) \
60 printk(KERN_DEBUG DEVNAME ": " fmt , ## arg)
62 /* ----------------------------------------------------------------------- */
64 static int get_key_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
67 int start, range, toggle, dev, code;
70 if (3 != i2c_master_recv(&ir->c,buf,3))
73 /* split rc5 data block ... */
74 start = (buf[0] >> 7) & 1;
75 range = (buf[0] >> 6) & 1;
76 toggle = (buf[0] >> 5) & 1;
78 code = (buf[1] >> 2) & 0x3f;
80 /* rc5 has two start bits
81 * the first bit must be one
82 * the second bit defines the command range (1 = 0-63, 0 = 64 - 127)
91 dprintk(1,"ir hauppauge (rc5): s%d r%d t%d dev=%d code=%d\n",
92 start, range, toggle, dev, code);
96 *ir_raw = (start << 12) | (toggle << 11) | (dev << 6) | code;
100 static int get_key_pixelview(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
105 if (1 != i2c_master_recv(&ir->c,&b,1)) {
106 dprintk(1,"read error\n");
114 static int get_key_pv951(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
119 if (1 != i2c_master_recv(&ir->c,&b,1)) {
120 dprintk(1,"read error\n");
127 dprintk(2,"key %02x\n", b);
134 static int get_key_knc1(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
139 if (1 != i2c_master_recv(&ir->c,&b,1)) {
140 dprintk(1,"read error\n");
144 /* it seems that 0xFE indicates that a button is still hold
145 down, while 0xff indicates that no button is hold
146 down. 0xfe sequences are sometimes interrupted by 0xFF */
148 dprintk(2,"key %02x\n", b);
162 /* Common (grey or coloured) pinnacle PCTV remote handling
165 static int get_key_pinnacle(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw,
166 int parity_offset, int marker, int code_modulo)
169 unsigned int start = 0,parity = 0,code = 0;
172 if (4 != i2c_master_recv(&ir->c,b,4)) {
173 dprintk(2,"read error\n");
177 for (start = 0; start<4; start++) {
178 if (b[start] == marker) {
179 code=b[(start+parity_offset+1)%4];
180 parity=b[(start+parity_offset)%4];
189 if (ir->old == parity)
194 /* drop special codes when a key is held down a long time for the grey controller
195 In this case, the second bit of the code is asserted */
196 if (marker == 0xfe && (code & 0x40))
204 dprintk(1,"Pinnacle PCTV key %02x\n", code);
209 /* The grey pinnacle PCTV remote
211 * There are one issue with this remote:
212 * - I2c packet does not change when the same key is pressed quickly. The workaround
213 * is to hold down each key for about half a second, so that another code is generated
214 * in the i2c packet, and the function can distinguish key presses.
216 * Sylvain Pasche <sylvain.pasche@gmail.com>
218 int get_key_pinnacle_grey(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
221 return get_key_pinnacle(ir, ir_key, ir_raw, 1, 0xfe, 0xff);
224 EXPORT_SYMBOL_GPL(get_key_pinnacle_grey);
227 /* The new pinnacle PCTV remote (with the colored buttons)
229 * Ricardo Cerqueira <v4l@cerqueira.org>
231 int get_key_pinnacle_color(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
233 /* code_modulo parameter (0x88) is used to reduce code value to fit inside IR_KEYTAB_SIZE
235 * this is the only value that results in 42 unique
239 return get_key_pinnacle(ir, ir_key, ir_raw, 2, 0x80, 0x88);
242 EXPORT_SYMBOL_GPL(get_key_pinnacle_color);
244 /* ----------------------------------------------------------------------- */
246 static void ir_key_poll(struct IR_i2c *ir)
248 static u32 ir_key, ir_raw;
251 dprintk(2,"ir_poll_key\n");
252 rc = ir->get_key(ir, &ir_key, &ir_raw);
254 dprintk(2,"error\n");
259 ir_input_nokey(ir->input, &ir->ir);
261 ir_input_keydown(ir->input, &ir->ir, ir_key, ir_raw);
265 static void ir_timer(unsigned long data)
267 struct IR_i2c *ir = (struct IR_i2c*)data;
268 schedule_work(&ir->work);
271 static void ir_work(struct work_struct *work)
273 struct IR_i2c *ir = container_of(work, struct IR_i2c, work);
275 mod_timer(&ir->timer, jiffies+HZ/10);
278 /* ----------------------------------------------------------------------- */
280 static int ir_attach(struct i2c_adapter *adap, int addr,
281 unsigned short flags, int kind);
282 static int ir_detach(struct i2c_client *client);
283 static int ir_probe(struct i2c_adapter *adap);
285 static struct i2c_driver driver = {
287 .name = "ir-kbd-i2c",
289 .id = I2C_DRIVERID_INFRARED,
290 .attach_adapter = ir_probe,
291 .detach_client = ir_detach,
294 static struct i2c_client client_template =
300 static int ir_attach(struct i2c_adapter *adap, int addr,
301 unsigned short flags, int kind)
303 IR_KEYTAB_TYPE *ir_codes = NULL;
307 struct input_dev *input_dev;
309 ir = kzalloc(sizeof(struct IR_i2c),GFP_KERNEL);
310 input_dev = input_allocate_device();
311 if (!ir || !input_dev) {
312 input_free_device(input_dev);
316 memset(ir,0,sizeof(*ir));
318 ir->c = client_template;
319 ir->input = input_dev;
321 ir->c.adapter = adap;
324 i2c_set_clientdata(&ir->c, ir);
329 ir->get_key = get_key_pixelview;
330 ir_type = IR_TYPE_OTHER;
331 ir_codes = ir_codes_empty;
335 ir->get_key = get_key_pv951;
336 ir_type = IR_TYPE_OTHER;
337 ir_codes = ir_codes_pv951;
342 ir->get_key = get_key_haup;
343 ir_type = IR_TYPE_RC5;
344 if (hauppauge == 1) {
345 ir_codes = ir_codes_hauppauge_new;
347 ir_codes = ir_codes_rc5_tv;
352 ir->get_key = get_key_knc1;
353 ir_type = IR_TYPE_OTHER;
354 ir_codes = ir_codes_empty;
358 /* Handled by saa7134-input */
359 name = "SAA713x remote";
360 ir_type = IR_TYPE_OTHER;
363 /* shouldn't happen */
364 printk(DEVNAME ": Huh? unknown i2c address (0x%02x)?\n",addr);
370 snprintf(ir->c.name, sizeof(ir->c.name), "i2c IR (%s)", name);
371 ir->ir_codes=ir_codes;
373 /* register i2c device
374 * At device register, IR codes may be changed to be
377 i2c_attach_client(&ir->c);
379 /* If IR not supported or disabled, unregisters driver */
380 if (ir->get_key == NULL) {
381 i2c_detach_client(&ir->c);
386 /* Phys addr can only be set after attaching (for ir->c.dev.bus_id) */
387 snprintf(ir->phys, sizeof(ir->phys), "%s/%s/ir0",
388 ir->c.adapter->dev.bus_id,
391 /* init + register input device */
392 ir_input_init(input_dev,&ir->ir,ir_type,ir->ir_codes);
393 input_dev->id.bustype = BUS_I2C;
394 input_dev->name = ir->c.name;
395 input_dev->phys = ir->phys;
397 /* register event device */
398 input_register_device(ir->input);
399 printk(DEVNAME ": %s detected at %s [%s]\n",
400 ir->input->name,ir->input->phys,adap->name);
402 /* start polling via eventd */
403 INIT_WORK(&ir->work, ir_work);
404 init_timer(&ir->timer);
405 ir->timer.function = ir_timer;
406 ir->timer.data = (unsigned long)ir;
407 schedule_work(&ir->work);
412 static int ir_detach(struct i2c_client *client)
414 struct IR_i2c *ir = i2c_get_clientdata(client);
416 /* kill outstanding polls */
417 del_timer(&ir->timer);
418 flush_scheduled_work();
420 /* unregister devices */
421 input_unregister_device(ir->input);
422 i2c_detach_client(&ir->c);
429 static int ir_probe(struct i2c_adapter *adap)
432 /* The external IR receiver is at i2c address 0x34 (0x35 for
433 reads). Future Hauppauge cards will have an internal
434 receiver at 0x30 (0x31 for reads). In theory, both can be
435 fitted, and Hauppauge suggest an external overrides an
438 That's why we probe 0x1a (~0x34) first. CB
441 static const int probe_bttv[] = { 0x1a, 0x18, 0x4b, 0x64, 0x30, -1};
442 static const int probe_saa7134[] = { 0x7a, 0x47, -1 };
443 static const int probe_em28XX[] = { 0x30, 0x47, -1 };
444 const int *probe = NULL;
453 case I2C_HW_B_CX2341X:
457 probe = probe_saa7134;
459 case I2C_HW_B_EM28XX:
460 probe = probe_em28XX;
466 memset(&c,0,sizeof(c));
468 for (i = 0; -1 != probe[i]; i++) {
470 rc = i2c_master_recv(&c,&buf,0);
471 dprintk(1,"probe 0x%02x @ %s: %s\n",
472 probe[i], adap->name,
473 (0 == rc) ? "yes" : "no");
475 ir_attach(adap,probe[i],0,0);
482 /* ----------------------------------------------------------------------- */
484 MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, Ulrich Mueller");
485 MODULE_DESCRIPTION("input driver for i2c IR remote controls");
486 MODULE_LICENSE("GPL");
488 static int __init ir_init(void)
490 return i2c_add_driver(&driver);
493 static void __exit ir_fini(void)
495 i2c_del_driver(&driver);
498 module_init(ir_init);
499 module_exit(ir_fini);
502 * Overrides for Emacs so that we follow Linus's tabbing style.
503 * ---------------------------------------------------------------------------