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, toggle, dev, code;
70 if (3 != i2c_master_recv(&ir->c,buf,3))
73 /* split rc5 data block ... */
74 start = (buf[0] >> 6) & 3;
75 toggle = (buf[0] >> 5) & 1;
77 code = (buf[1] >> 2) & 0x3f;
82 dprintk(1,"ir hauppauge (rc5): s%d t%d dev=%d code=%d\n",
83 start, toggle, dev, code);
87 *ir_raw = (start << 12) | (toggle << 11) | (dev << 6) | code;
91 static int get_key_pixelview(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
96 if (1 != i2c_master_recv(&ir->c,&b,1)) {
97 dprintk(1,"read error\n");
105 static int get_key_pv951(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
110 if (1 != i2c_master_recv(&ir->c,&b,1)) {
111 dprintk(1,"read error\n");
118 dprintk(2,"key %02x\n", b);
125 static int get_key_knc1(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");
135 /* it seems that 0xFE indicates that a button is still hold
136 down, while 0xff indicates that no button is hold
137 down. 0xfe sequences are sometimes interrupted by 0xFF */
139 dprintk(2,"key %02x\n", b);
153 /* Common (grey or coloured) pinnacle PCTV remote handling
156 static int get_key_pinnacle(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw,
157 int parity_offset, int marker, int code_modulo)
160 unsigned int start = 0,parity = 0,code = 0;
163 if (4 != i2c_master_recv(&ir->c,b,4)) {
164 dprintk(2,"read error\n");
168 for (start = 0; start<4; start++) {
169 if (b[start] == marker) {
170 code=b[(start+parity_offset+1)%4];
171 parity=b[(start+parity_offset)%4];
180 if (ir->old == parity)
185 /* drop special codes when a key is held down a long time for the grey controller
186 In this case, the second bit of the code is asserted */
187 if (marker == 0xfe && (code & 0x40))
195 dprintk(1,"Pinnacle PCTV key %02x\n", code);
200 /* The grey pinnacle PCTV remote
202 * There are one issue with this remote:
203 * - I2c packet does not change when the same key is pressed quickly. The workaround
204 * is to hold down each key for about half a second, so that another code is generated
205 * in the i2c packet, and the function can distinguish key presses.
207 * Sylvain Pasche <sylvain.pasche@gmail.com>
209 int get_key_pinnacle_grey(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
212 return get_key_pinnacle(ir, ir_key, ir_raw, 1, 0xfe, 0xff);
215 EXPORT_SYMBOL_GPL(get_key_pinnacle_grey);
218 /* The new pinnacle PCTV remote (with the colored buttons)
220 * Ricardo Cerqueira <v4l@cerqueira.org>
222 int get_key_pinnacle_color(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
224 /* code_modulo parameter (0x88) is used to reduce code value to fit inside IR_KEYTAB_SIZE
226 * this is the only value that results in 42 unique
230 return get_key_pinnacle(ir, ir_key, ir_raw, 2, 0x80, 0x88);
233 EXPORT_SYMBOL_GPL(get_key_pinnacle_color);
235 /* ----------------------------------------------------------------------- */
237 static void ir_key_poll(struct IR_i2c *ir)
239 static u32 ir_key, ir_raw;
242 dprintk(2,"ir_poll_key\n");
243 rc = ir->get_key(ir, &ir_key, &ir_raw);
245 dprintk(2,"error\n");
250 ir_input_nokey(ir->input, &ir->ir);
252 ir_input_keydown(ir->input, &ir->ir, ir_key, ir_raw);
256 static void ir_timer(unsigned long data)
258 struct IR_i2c *ir = (struct IR_i2c*)data;
259 schedule_work(&ir->work);
262 static void ir_work(void *data)
264 struct IR_i2c *ir = data;
266 mod_timer(&ir->timer, jiffies+HZ/10);
269 /* ----------------------------------------------------------------------- */
271 static int ir_attach(struct i2c_adapter *adap, int addr,
272 unsigned short flags, int kind);
273 static int ir_detach(struct i2c_client *client);
274 static int ir_probe(struct i2c_adapter *adap);
276 static struct i2c_driver driver = {
278 .name = "ir-kbd-i2c",
280 .id = I2C_DRIVERID_INFRARED,
281 .attach_adapter = ir_probe,
282 .detach_client = ir_detach,
285 static struct i2c_client client_template =
291 static int ir_attach(struct i2c_adapter *adap, int addr,
292 unsigned short flags, int kind)
294 IR_KEYTAB_TYPE *ir_codes = NULL;
298 struct input_dev *input_dev;
300 ir = kzalloc(sizeof(struct IR_i2c),GFP_KERNEL);
301 input_dev = input_allocate_device();
302 if (!ir || !input_dev) {
303 input_free_device(input_dev);
307 memset(ir,0,sizeof(*ir));
309 ir->c = client_template;
310 ir->input = input_dev;
312 ir->c.adapter = adap;
315 i2c_set_clientdata(&ir->c, ir);
320 ir->get_key = get_key_pixelview;
321 ir_type = IR_TYPE_OTHER;
322 ir_codes = ir_codes_empty;
326 ir->get_key = get_key_pv951;
327 ir_type = IR_TYPE_OTHER;
328 ir_codes = ir_codes_pv951;
333 ir->get_key = get_key_haup;
334 ir_type = IR_TYPE_RC5;
335 if (hauppauge == 1) {
336 ir_codes = ir_codes_hauppauge_new;
338 ir_codes = ir_codes_rc5_tv;
343 ir->get_key = get_key_knc1;
344 ir_type = IR_TYPE_OTHER;
345 ir_codes = ir_codes_empty;
349 /* Handled by saa7134-input */
350 name = "SAA713x remote";
351 ir_type = IR_TYPE_OTHER;
354 /* shouldn't happen */
355 printk(DEVNAME ": Huh? unknown i2c address (0x%02x)?\n",addr);
361 snprintf(ir->c.name, sizeof(ir->c.name), "i2c IR (%s)", name);
362 ir->ir_codes=ir_codes;
364 /* register i2c device
365 * At device register, IR codes may be changed to be
368 i2c_attach_client(&ir->c);
370 /* If IR not supported or disabled, unregisters driver */
371 if (ir->get_key == NULL) {
372 i2c_detach_client(&ir->c);
377 /* Phys addr can only be set after attaching (for ir->c.dev.bus_id) */
378 snprintf(ir->phys, sizeof(ir->phys), "%s/%s/ir0",
379 ir->c.adapter->dev.bus_id,
382 /* init + register input device */
383 ir_input_init(input_dev,&ir->ir,ir_type,ir->ir_codes);
384 input_dev->id.bustype = BUS_I2C;
385 input_dev->name = ir->c.name;
386 input_dev->phys = ir->phys;
388 /* register event device */
389 input_register_device(ir->input);
390 printk(DEVNAME ": %s detected at %s [%s]\n",
391 ir->input->name,ir->input->phys,adap->name);
393 /* start polling via eventd */
394 INIT_WORK(&ir->work, ir_work, ir);
395 init_timer(&ir->timer);
396 ir->timer.function = ir_timer;
397 ir->timer.data = (unsigned long)ir;
398 schedule_work(&ir->work);
403 static int ir_detach(struct i2c_client *client)
405 struct IR_i2c *ir = i2c_get_clientdata(client);
407 /* kill outstanding polls */
408 del_timer(&ir->timer);
409 flush_scheduled_work();
411 /* unregister devices */
412 input_unregister_device(ir->input);
413 i2c_detach_client(&ir->c);
420 static int ir_probe(struct i2c_adapter *adap)
423 /* The external IR receiver is at i2c address 0x34 (0x35 for
424 reads). Future Hauppauge cards will have an internal
425 receiver at 0x30 (0x31 for reads). In theory, both can be
426 fitted, and Hauppauge suggest an external overrides an
429 That's why we probe 0x1a (~0x34) first. CB
432 static const int probe_bttv[] = { 0x1a, 0x18, 0x4b, 0x64, 0x30, -1};
433 static const int probe_saa7134[] = { 0x7a, 0x47, -1 };
434 static const int probe_em28XX[] = { 0x30, 0x47, -1 };
435 const int *probe = NULL;
444 case I2C_HW_B_CX2341X:
448 probe = probe_saa7134;
450 case I2C_HW_B_EM28XX:
451 probe = probe_em28XX;
457 memset(&c,0,sizeof(c));
459 for (i = 0; -1 != probe[i]; i++) {
461 rc = i2c_master_recv(&c,&buf,0);
462 dprintk(1,"probe 0x%02x @ %s: %s\n",
463 probe[i], adap->name,
464 (0 == rc) ? "yes" : "no");
466 ir_attach(adap,probe[i],0,0);
473 /* ----------------------------------------------------------------------- */
475 MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, Ulrich Mueller");
476 MODULE_DESCRIPTION("input driver for i2c IR remote controls");
477 MODULE_LICENSE("GPL");
479 static int __init ir_init(void)
481 return i2c_add_driver(&driver);
484 static void __exit ir_fini(void)
486 i2c_del_driver(&driver);
489 module_init(ir_init);
490 module_exit(ir_fini);
493 * Overrides for Emacs so that we follow Linus's tabbing style.
494 * ---------------------------------------------------------------------------