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/init.h>
32 #include <linux/kernel.h>
33 #include <linux/string.h>
34 #include <linux/timer.h>
35 #include <linux/delay.h>
36 #include <linux/errno.h>
37 #include <linux/slab.h>
38 #include <linux/i2c.h>
39 #include <linux/i2c-id.h>
40 #include <linux/workqueue.h>
41 #include <asm/semaphore.h>
43 #include <media/ir-common.h>
44 #include <media/ir-kbd-i2c.h>
46 /* ----------------------------------------------------------------------- */
47 /* insmod parameters */
50 module_param(debug, int, 0644); /* debug level (0,1,2) */
52 static int hauppauge = 0;
53 module_param(hauppauge, int, 0644); /* Choose Hauppauge remote */
54 MODULE_PARM_DESC(hauppauge, "Specify Hauppauge remote: 0=black, 1=grey (defaults to 0)");
57 #define DEVNAME "ir-kbd-i2c"
58 #define dprintk(level, fmt, arg...) if (debug >= level) \
59 printk(KERN_DEBUG DEVNAME ": " fmt , ## arg)
61 /* ----------------------------------------------------------------------- */
63 static int get_key_haup_common(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw,
67 int start, range, toggle, dev, code;
70 if (size != i2c_master_recv(&ir->c,buf,size))
73 /* split rc5 data block ... */
74 start = (buf[offset] >> 7) & 1;
75 range = (buf[offset] >> 6) & 1;
76 toggle = (buf[offset] >> 5) & 1;
77 dev = buf[offset] & 0x1f;
78 code = (buf[offset+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 inline int get_key_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
102 return get_key_haup_common (ir, ir_key, ir_raw, 3, 0);
105 static inline int get_key_haup_xvr(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
107 return get_key_haup_common (ir, ir_key, ir_raw, 6, 3);
110 static int get_key_pixelview(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
115 if (1 != i2c_master_recv(&ir->c,&b,1)) {
116 dprintk(1,"read error\n");
124 static int get_key_pv951(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
129 if (1 != i2c_master_recv(&ir->c,&b,1)) {
130 dprintk(1,"read error\n");
137 dprintk(2,"key %02x\n", b);
144 static int get_key_knc1(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
149 if (1 != i2c_master_recv(&ir->c,&b,1)) {
150 dprintk(1,"read error\n");
154 /* it seems that 0xFE indicates that a button is still hold
155 down, while 0xff indicates that no button is hold
156 down. 0xfe sequences are sometimes interrupted by 0xFF */
158 dprintk(2,"key %02x\n", b);
172 /* Common (grey or coloured) pinnacle PCTV remote handling
175 static int get_key_pinnacle(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw,
176 int parity_offset, int marker, int code_modulo)
179 unsigned int start = 0,parity = 0,code = 0;
182 if (4 != i2c_master_recv(&ir->c,b,4)) {
183 dprintk(2,"read error\n");
187 for (start = 0; start < ARRAY_SIZE(b); start++) {
188 if (b[start] == marker) {
189 code=b[(start+parity_offset+1)%4];
190 parity=b[(start+parity_offset)%4];
199 if (ir->old == parity)
204 /* drop special codes when a key is held down a long time for the grey controller
205 In this case, the second bit of the code is asserted */
206 if (marker == 0xfe && (code & 0x40))
214 dprintk(1,"Pinnacle PCTV key %02x\n", code);
219 /* The grey pinnacle PCTV remote
221 * There are one issue with this remote:
222 * - I2c packet does not change when the same key is pressed quickly. The workaround
223 * is to hold down each key for about half a second, so that another code is generated
224 * in the i2c packet, and the function can distinguish key presses.
226 * Sylvain Pasche <sylvain.pasche@gmail.com>
228 int get_key_pinnacle_grey(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
231 return get_key_pinnacle(ir, ir_key, ir_raw, 1, 0xfe, 0xff);
234 EXPORT_SYMBOL_GPL(get_key_pinnacle_grey);
237 /* The new pinnacle PCTV remote (with the colored buttons)
239 * Ricardo Cerqueira <v4l@cerqueira.org>
241 int get_key_pinnacle_color(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
243 /* code_modulo parameter (0x88) is used to reduce code value to fit inside IR_KEYTAB_SIZE
245 * this is the only value that results in 42 unique
249 return get_key_pinnacle(ir, ir_key, ir_raw, 2, 0x80, 0x88);
252 EXPORT_SYMBOL_GPL(get_key_pinnacle_color);
254 /* ----------------------------------------------------------------------- */
256 static void ir_key_poll(struct IR_i2c *ir)
258 static u32 ir_key, ir_raw;
261 dprintk(2,"ir_poll_key\n");
262 rc = ir->get_key(ir, &ir_key, &ir_raw);
264 dprintk(2,"error\n");
269 ir_input_nokey(ir->input, &ir->ir);
271 ir_input_keydown(ir->input, &ir->ir, ir_key, ir_raw);
275 static void ir_timer(unsigned long data)
277 struct IR_i2c *ir = (struct IR_i2c*)data;
278 schedule_work(&ir->work);
281 static void ir_work(struct work_struct *work)
283 struct IR_i2c *ir = container_of(work, struct IR_i2c, work);
286 mod_timer(&ir->timer, jiffies + msecs_to_jiffies(100));
289 /* ----------------------------------------------------------------------- */
291 static int ir_attach(struct i2c_adapter *adap, int addr,
292 unsigned short flags, int kind);
293 static int ir_detach(struct i2c_client *client);
294 static int ir_probe(struct i2c_adapter *adap);
296 static struct i2c_driver driver = {
298 .name = "ir-kbd-i2c",
300 .id = I2C_DRIVERID_INFRARED,
301 .attach_adapter = ir_probe,
302 .detach_client = ir_detach,
305 static struct i2c_client client_template =
311 static int ir_attach(struct i2c_adapter *adap, int addr,
312 unsigned short flags, int kind)
314 IR_KEYTAB_TYPE *ir_codes = NULL;
318 struct input_dev *input_dev;
321 ir = kzalloc(sizeof(struct IR_i2c),GFP_KERNEL);
322 input_dev = input_allocate_device();
323 if (!ir || !input_dev) {
328 ir->c = client_template;
329 ir->input = input_dev;
331 ir->c.adapter = adap;
334 i2c_set_clientdata(&ir->c, ir);
339 ir->get_key = get_key_pixelview;
340 ir_type = IR_TYPE_OTHER;
341 ir_codes = ir_codes_empty;
345 ir->get_key = get_key_pv951;
346 ir_type = IR_TYPE_OTHER;
347 ir_codes = ir_codes_pv951;
352 ir->get_key = get_key_haup;
353 ir_type = IR_TYPE_RC5;
354 if (hauppauge == 1) {
355 ir_codes = ir_codes_hauppauge_new;
357 ir_codes = ir_codes_rc5_tv;
362 ir->get_key = get_key_knc1;
363 ir_type = IR_TYPE_OTHER;
364 ir_codes = ir_codes_empty;
369 if (adap->id == I2C_HW_B_CX2388x) {
370 /* Handled by cx88-input */
371 name = "CX2388x remote";
372 ir_type = IR_TYPE_RC5;
373 ir->get_key = get_key_haup_xvr;
374 if (hauppauge == 1) {
375 ir_codes = ir_codes_hauppauge_new;
377 ir_codes = ir_codes_rc5_tv;
380 /* Handled by saa7134-input */
381 name = "SAA713x remote";
382 ir_type = IR_TYPE_OTHER;
386 /* shouldn't happen */
387 printk(DEVNAME ": Huh? unknown i2c address (0x%02x)?\n", addr);
393 snprintf(ir->c.name, sizeof(ir->c.name), "i2c IR (%s)", name);
394 ir->ir_codes = ir_codes;
396 /* register i2c device
397 * At device register, IR codes may be changed to be
400 err = i2c_attach_client(&ir->c);
404 /* If IR not supported or disabled, unregisters driver */
405 if (ir->get_key == NULL) {
410 /* Phys addr can only be set after attaching (for ir->c.dev.bus_id) */
411 snprintf(ir->phys, sizeof(ir->phys), "%s/%s/ir0",
412 ir->c.adapter->dev.bus_id,
415 /* init + register input device */
416 ir_input_init(input_dev, &ir->ir, ir_type, ir->ir_codes);
417 input_dev->id.bustype = BUS_I2C;
418 input_dev->name = ir->c.name;
419 input_dev->phys = ir->phys;
421 err = input_register_device(ir->input);
425 printk(DEVNAME ": %s detected at %s [%s]\n",
426 ir->input->name, ir->input->phys, adap->name);
428 /* start polling via eventd */
429 INIT_WORK(&ir->work, ir_work);
430 init_timer(&ir->timer);
431 ir->timer.function = ir_timer;
432 ir->timer.data = (unsigned long)ir;
433 schedule_work(&ir->work);
438 i2c_detach_client(&ir->c);
440 input_free_device(input_dev);
445 static int ir_detach(struct i2c_client *client)
447 struct IR_i2c *ir = i2c_get_clientdata(client);
449 /* kill outstanding polls */
450 del_timer_sync(&ir->timer);
451 flush_scheduled_work();
453 /* unregister devices */
454 input_unregister_device(ir->input);
455 i2c_detach_client(&ir->c);
462 static int ir_probe(struct i2c_adapter *adap)
465 /* The external IR receiver is at i2c address 0x34 (0x35 for
466 reads). Future Hauppauge cards will have an internal
467 receiver at 0x30 (0x31 for reads). In theory, both can be
468 fitted, and Hauppauge suggest an external overrides an
471 That's why we probe 0x1a (~0x34) first. CB
474 static const int probe_bttv[] = { 0x1a, 0x18, 0x4b, 0x64, 0x30, -1};
475 static const int probe_saa7134[] = { 0x7a, 0x47, 0x71, -1 };
476 static const int probe_em28XX[] = { 0x30, 0x47, -1 };
477 static const int probe_cx88[] = { 0x18, 0x71, -1 };
478 const int *probe = NULL;
487 case I2C_HW_B_CX2341X:
491 probe = probe_saa7134;
493 case I2C_HW_B_EM28XX:
494 probe = probe_em28XX;
496 case I2C_HW_B_CX2388x:
503 memset(&c,0,sizeof(c));
505 for (i = 0; -1 != probe[i]; i++) {
507 rc = i2c_master_recv(&c,&buf,0);
508 dprintk(1,"probe 0x%02x @ %s: %s\n",
509 probe[i], adap->name,
510 (0 == rc) ? "yes" : "no");
512 ir_attach(adap,probe[i],0,0);
519 /* ----------------------------------------------------------------------- */
521 MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, Ulrich Mueller");
522 MODULE_DESCRIPTION("input driver for i2c IR remote controls");
523 MODULE_LICENSE("GPL");
525 static int __init ir_init(void)
527 return i2c_add_driver(&driver);
530 static void __exit ir_fini(void)
532 i2c_del_driver(&driver);
535 module_init(ir_init);
536 module_exit(ir_fini);
539 * Overrides for Emacs so that we follow Linus's tabbing style.
540 * ---------------------------------------------------------------------------