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/string.h>
35 #include <linux/timer.h>
36 #include <linux/delay.h>
37 #include <linux/errno.h>
38 #include <linux/slab.h>
39 #include <linux/i2c.h>
40 #include <linux/i2c-id.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_common(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw,
68 int start, range, toggle, dev, code;
71 if (size != i2c_master_recv(&ir->c,buf,size))
74 /* split rc5 data block ... */
75 start = (buf[offset] >> 7) & 1;
76 range = (buf[offset] >> 6) & 1;
77 toggle = (buf[offset] >> 5) & 1;
78 dev = buf[offset] & 0x1f;
79 code = (buf[offset+1] >> 2) & 0x3f;
81 /* rc5 has two start bits
82 * the first bit must be one
83 * the second bit defines the command range (1 = 0-63, 0 = 64 - 127)
92 dprintk(1,"ir hauppauge (rc5): s%d r%d t%d dev=%d code=%d\n",
93 start, range, toggle, dev, code);
97 *ir_raw = (start << 12) | (toggle << 11) | (dev << 6) | code;
101 static inline int get_key_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
103 return get_key_haup_common (ir, ir_key, ir_raw, 3, 0);
106 static inline int get_key_haup_xvr(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
108 return get_key_haup_common (ir, ir_key, ir_raw, 6, 3);
111 static int get_key_pixelview(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
116 if (1 != i2c_master_recv(&ir->c,&b,1)) {
117 dprintk(1,"read error\n");
125 static int get_key_pv951(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
130 if (1 != i2c_master_recv(&ir->c,&b,1)) {
131 dprintk(1,"read error\n");
138 dprintk(2,"key %02x\n", b);
145 static int get_key_knc1(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
150 if (1 != i2c_master_recv(&ir->c,&b,1)) {
151 dprintk(1,"read error\n");
155 /* it seems that 0xFE indicates that a button is still hold
156 down, while 0xff indicates that no button is hold
157 down. 0xfe sequences are sometimes interrupted by 0xFF */
159 dprintk(2,"key %02x\n", b);
173 /* Common (grey or coloured) pinnacle PCTV remote handling
176 static int get_key_pinnacle(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw,
177 int parity_offset, int marker, int code_modulo)
180 unsigned int start = 0,parity = 0,code = 0;
183 if (4 != i2c_master_recv(&ir->c,b,4)) {
184 dprintk(2,"read error\n");
188 for (start = 0; start < ARRAY_SIZE(b); start++) {
189 if (b[start] == marker) {
190 code=b[(start+parity_offset+1)%4];
191 parity=b[(start+parity_offset)%4];
200 if (ir->old == parity)
205 /* drop special codes when a key is held down a long time for the grey controller
206 In this case, the second bit of the code is asserted */
207 if (marker == 0xfe && (code & 0x40))
215 dprintk(1,"Pinnacle PCTV key %02x\n", code);
220 /* The grey pinnacle PCTV remote
222 * There are one issue with this remote:
223 * - I2c packet does not change when the same key is pressed quickly. The workaround
224 * is to hold down each key for about half a second, so that another code is generated
225 * in the i2c packet, and the function can distinguish key presses.
227 * Sylvain Pasche <sylvain.pasche@gmail.com>
229 int get_key_pinnacle_grey(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
232 return get_key_pinnacle(ir, ir_key, ir_raw, 1, 0xfe, 0xff);
235 EXPORT_SYMBOL_GPL(get_key_pinnacle_grey);
238 /* The new pinnacle PCTV remote (with the colored buttons)
240 * Ricardo Cerqueira <v4l@cerqueira.org>
242 int get_key_pinnacle_color(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
244 /* code_modulo parameter (0x88) is used to reduce code value to fit inside IR_KEYTAB_SIZE
246 * this is the only value that results in 42 unique
250 return get_key_pinnacle(ir, ir_key, ir_raw, 2, 0x80, 0x88);
253 EXPORT_SYMBOL_GPL(get_key_pinnacle_color);
255 /* ----------------------------------------------------------------------- */
257 static void ir_key_poll(struct IR_i2c *ir)
259 static u32 ir_key, ir_raw;
262 dprintk(2,"ir_poll_key\n");
263 rc = ir->get_key(ir, &ir_key, &ir_raw);
265 dprintk(2,"error\n");
270 ir_input_nokey(ir->input, &ir->ir);
272 ir_input_keydown(ir->input, &ir->ir, ir_key, ir_raw);
276 static void ir_timer(unsigned long data)
278 struct IR_i2c *ir = (struct IR_i2c*)data;
279 schedule_work(&ir->work);
282 static void ir_work(struct work_struct *work)
284 struct IR_i2c *ir = container_of(work, struct IR_i2c, work);
287 mod_timer(&ir->timer, jiffies + msecs_to_jiffies(100));
290 /* ----------------------------------------------------------------------- */
292 static int ir_attach(struct i2c_adapter *adap, int addr,
293 unsigned short flags, int kind);
294 static int ir_detach(struct i2c_client *client);
295 static int ir_probe(struct i2c_adapter *adap);
297 static struct i2c_driver driver = {
299 .name = "ir-kbd-i2c",
301 .id = I2C_DRIVERID_INFRARED,
302 .attach_adapter = ir_probe,
303 .detach_client = ir_detach,
306 static struct i2c_client client_template =
312 static int ir_attach(struct i2c_adapter *adap, int addr,
313 unsigned short flags, int kind)
315 IR_KEYTAB_TYPE *ir_codes = NULL;
319 struct input_dev *input_dev;
322 ir = kzalloc(sizeof(struct IR_i2c),GFP_KERNEL);
323 input_dev = input_allocate_device();
324 if (!ir || !input_dev) {
329 ir->c = client_template;
330 ir->input = input_dev;
332 ir->c.adapter = adap;
335 i2c_set_clientdata(&ir->c, ir);
340 ir->get_key = get_key_pixelview;
341 ir_type = IR_TYPE_OTHER;
342 ir_codes = ir_codes_empty;
346 ir->get_key = get_key_pv951;
347 ir_type = IR_TYPE_OTHER;
348 ir_codes = ir_codes_pv951;
353 ir->get_key = get_key_haup;
354 ir_type = IR_TYPE_RC5;
355 if (hauppauge == 1) {
356 ir_codes = ir_codes_hauppauge_new;
358 ir_codes = ir_codes_rc5_tv;
363 ir->get_key = get_key_knc1;
364 ir_type = IR_TYPE_OTHER;
365 ir_codes = ir_codes_empty;
370 if (adap->id == I2C_HW_B_CX2388x) {
371 /* Handled by cx88-input */
372 name = "CX2388x remote";
373 ir_type = IR_TYPE_RC5;
374 ir->get_key = get_key_haup_xvr;
375 if (hauppauge == 1) {
376 ir_codes = ir_codes_hauppauge_new;
378 ir_codes = ir_codes_rc5_tv;
381 /* Handled by saa7134-input */
382 name = "SAA713x remote";
383 ir_type = IR_TYPE_OTHER;
387 /* shouldn't happen */
388 printk(DEVNAME ": Huh? unknown i2c address (0x%02x)?\n", addr);
394 snprintf(ir->c.name, sizeof(ir->c.name), "i2c IR (%s)", name);
395 ir->ir_codes = ir_codes;
397 /* register i2c device
398 * At device register, IR codes may be changed to be
401 err = i2c_attach_client(&ir->c);
405 /* If IR not supported or disabled, unregisters driver */
406 if (ir->get_key == NULL) {
411 /* Phys addr can only be set after attaching (for ir->c.dev.bus_id) */
412 snprintf(ir->phys, sizeof(ir->phys), "%s/%s/ir0",
413 ir->c.adapter->dev.bus_id,
416 /* init + register input device */
417 ir_input_init(input_dev, &ir->ir, ir_type, ir->ir_codes);
418 input_dev->id.bustype = BUS_I2C;
419 input_dev->name = ir->c.name;
420 input_dev->phys = ir->phys;
422 err = input_register_device(ir->input);
426 printk(DEVNAME ": %s detected at %s [%s]\n",
427 ir->input->name, ir->input->phys, adap->name);
429 /* start polling via eventd */
430 INIT_WORK(&ir->work, ir_work);
431 init_timer(&ir->timer);
432 ir->timer.function = ir_timer;
433 ir->timer.data = (unsigned long)ir;
434 schedule_work(&ir->work);
439 i2c_detach_client(&ir->c);
441 input_free_device(input_dev);
446 static int ir_detach(struct i2c_client *client)
448 struct IR_i2c *ir = i2c_get_clientdata(client);
450 /* kill outstanding polls */
451 del_timer_sync(&ir->timer);
452 flush_scheduled_work();
454 /* unregister devices */
455 input_unregister_device(ir->input);
456 i2c_detach_client(&ir->c);
463 static int ir_probe(struct i2c_adapter *adap)
466 /* The external IR receiver is at i2c address 0x34 (0x35 for
467 reads). Future Hauppauge cards will have an internal
468 receiver at 0x30 (0x31 for reads). In theory, both can be
469 fitted, and Hauppauge suggest an external overrides an
472 That's why we probe 0x1a (~0x34) first. CB
475 static const int probe_bttv[] = { 0x1a, 0x18, 0x4b, 0x64, 0x30, -1};
476 static const int probe_saa7134[] = { 0x7a, 0x47, 0x71, -1 };
477 static const int probe_em28XX[] = { 0x30, 0x47, -1 };
478 static const int probe_cx88[] = { 0x18, 0x71, -1 };
479 const int *probe = NULL;
488 case I2C_HW_B_CX2341X:
492 probe = probe_saa7134;
494 case I2C_HW_B_EM28XX:
495 probe = probe_em28XX;
497 case I2C_HW_B_CX2388x:
504 memset(&c,0,sizeof(c));
506 for (i = 0; -1 != probe[i]; i++) {
508 rc = i2c_master_recv(&c,&buf,0);
509 dprintk(1,"probe 0x%02x @ %s: %s\n",
510 probe[i], adap->name,
511 (0 == rc) ? "yes" : "no");
513 ir_attach(adap,probe[i],0,0);
520 /* ----------------------------------------------------------------------- */
522 MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, Ulrich Mueller");
523 MODULE_DESCRIPTION("input driver for i2c IR remote controls");
524 MODULE_LICENSE("GPL");
526 static int __init ir_init(void)
528 return i2c_add_driver(&driver);
531 static void __exit ir_fini(void)
533 i2c_del_driver(&driver);
536 module_init(ir_init);
537 module_exit(ir_fini);
540 * Overrides for Emacs so that we follow Linus's tabbing style.
541 * ---------------------------------------------------------------------------