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;
310 ir = kzalloc(sizeof(struct IR_i2c),GFP_KERNEL);
311 input_dev = input_allocate_device();
312 if (!ir || !input_dev) {
317 ir->c = client_template;
318 ir->input = input_dev;
320 ir->c.adapter = adap;
323 i2c_set_clientdata(&ir->c, ir);
328 ir->get_key = get_key_pixelview;
329 ir_type = IR_TYPE_OTHER;
330 ir_codes = ir_codes_empty;
334 ir->get_key = get_key_pv951;
335 ir_type = IR_TYPE_OTHER;
336 ir_codes = ir_codes_pv951;
341 ir->get_key = get_key_haup;
342 ir_type = IR_TYPE_RC5;
343 if (hauppauge == 1) {
344 ir_codes = ir_codes_hauppauge_new;
346 ir_codes = ir_codes_rc5_tv;
351 ir->get_key = get_key_knc1;
352 ir_type = IR_TYPE_OTHER;
353 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 err = i2c_attach_client(&ir->c);
381 /* If IR not supported or disabled, unregisters driver */
382 if (ir->get_key == NULL) {
387 /* Phys addr can only be set after attaching (for ir->c.dev.bus_id) */
388 snprintf(ir->phys, sizeof(ir->phys), "%s/%s/ir0",
389 ir->c.adapter->dev.bus_id,
392 /* init + register input device */
393 ir_input_init(input_dev, &ir->ir, ir_type, ir->ir_codes);
394 input_dev->id.bustype = BUS_I2C;
395 input_dev->name = ir->c.name;
396 input_dev->phys = ir->phys;
398 err = input_register_device(ir->input);
402 printk(DEVNAME ": %s detected at %s [%s]\n",
403 ir->input->name, ir->input->phys, adap->name);
405 /* start polling via eventd */
406 INIT_WORK(&ir->work, ir_work);
407 init_timer(&ir->timer);
408 ir->timer.function = ir_timer;
409 ir->timer.data = (unsigned long)ir;
410 schedule_work(&ir->work);
415 i2c_detach_client(&ir->c);
417 input_free_device(input_dev);
422 static int ir_detach(struct i2c_client *client)
424 struct IR_i2c *ir = i2c_get_clientdata(client);
426 /* kill outstanding polls */
427 del_timer_sync(&ir->timer);
428 flush_scheduled_work();
430 /* unregister devices */
431 input_unregister_device(ir->input);
432 i2c_detach_client(&ir->c);
439 static int ir_probe(struct i2c_adapter *adap)
442 /* The external IR receiver is at i2c address 0x34 (0x35 for
443 reads). Future Hauppauge cards will have an internal
444 receiver at 0x30 (0x31 for reads). In theory, both can be
445 fitted, and Hauppauge suggest an external overrides an
448 That's why we probe 0x1a (~0x34) first. CB
451 static const int probe_bttv[] = { 0x1a, 0x18, 0x4b, 0x64, 0x30, -1};
452 static const int probe_saa7134[] = { 0x7a, 0x47, 0x71, -1 };
453 static const int probe_em28XX[] = { 0x30, 0x47, -1 };
454 const int *probe = NULL;
463 case I2C_HW_B_CX2341X:
467 probe = probe_saa7134;
469 case I2C_HW_B_EM28XX:
470 probe = probe_em28XX;
476 memset(&c,0,sizeof(c));
478 for (i = 0; -1 != probe[i]; i++) {
480 rc = i2c_master_recv(&c,&buf,0);
481 dprintk(1,"probe 0x%02x @ %s: %s\n",
482 probe[i], adap->name,
483 (0 == rc) ? "yes" : "no");
485 ir_attach(adap,probe[i],0,0);
492 /* ----------------------------------------------------------------------- */
494 MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, Ulrich Mueller");
495 MODULE_DESCRIPTION("input driver for i2c IR remote controls");
496 MODULE_LICENSE("GPL");
498 static int __init ir_init(void)
500 return i2c_add_driver(&driver);
503 static void __exit ir_fini(void)
505 i2c_del_driver(&driver);
508 module_init(ir_init);
509 module_exit(ir_fini);
512 * Overrides for Emacs so that we follow Linus's tabbing style.
513 * ---------------------------------------------------------------------------