2 handle em28xx IR remotes via linux kernel input layer.
4 Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
5 Markus Rechberger <mrechberger@gmail.com>
6 Mauro Carvalho Chehab <mchehab@infradead.org>
7 Sascha Sommer <saschasommer@freenet.de>
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/interrupt.h>
28 #include <linux/input.h>
29 #include <linux/usb.h>
33 #define EM28XX_SNAPSHOT_KEY KEY_CAMERA
34 #define EM28XX_SBUTTON_QUERY_INTERVAL 500
35 #define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20
37 static unsigned int ir_debug
;
38 module_param(ir_debug
, int, 0644);
39 MODULE_PARM_DESC(ir_debug
, "enable debug messages [IR]");
41 #define i2cdprintk(fmt, arg...) \
43 printk(KERN_DEBUG "%s/ir: " fmt, ir->c.name , ## arg); \
46 #define dprintk(fmt, arg...) \
48 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
51 /**********************************************************
52 Polling structure used by em28xx IR's
53 **********************************************************/
55 struct em28xx_ir_poll_result
{
56 unsigned int toggle_bit
:1;
57 unsigned int read_count
:7;
59 u8 rc_data
[4]; /* 1 byte on em2860/2880, 4 on em2874 */
64 struct input_dev
*input
;
65 struct ir_input_state ir
;
69 /* poll external decoder */
71 struct work_struct work
;
72 struct timer_list timer
;
73 unsigned int last_toggle
:1;
74 unsigned int last_readcount
;
75 unsigned int repeat_interval
;
77 int (*get_key
)(struct em28xx_IR
*, struct em28xx_ir_poll_result
*);
80 /**********************************************************
81 I2C IR based get keycodes - should be used with ir-kbd-i2c
82 **********************************************************/
84 int em28xx_get_key_terratec(struct IR_i2c
*ir
, u32
*ir_key
, u32
*ir_raw
)
89 if (1 != i2c_master_recv(&ir
->c
, &b
, 1)) {
90 i2cdprintk("read error\n");
94 /* it seems that 0xFE indicates that a button is still hold
95 down, while 0xff indicates that no button is hold
96 down. 0xfe sequences are sometimes interrupted by 0xFF */
98 i2cdprintk("key %02x\n", b
);
112 int em28xx_get_key_em_haup(struct IR_i2c
*ir
, u32
*ir_key
, u32
*ir_raw
)
114 unsigned char buf
[2];
118 if (2 != i2c_master_recv(&ir
->c
, buf
, 2))
121 /* Does eliminate repeated parity code */
127 /* Rearranges bits to the right order */
128 code
= ((buf
[0]&0x01)<<5) | /* 0010 0000 */
129 ((buf
[0]&0x02)<<3) | /* 0001 0000 */
130 ((buf
[0]&0x04)<<1) | /* 0000 1000 */
131 ((buf
[0]&0x08)>>1) | /* 0000 0100 */
132 ((buf
[0]&0x10)>>3) | /* 0000 0010 */
133 ((buf
[0]&0x20)>>5); /* 0000 0001 */
135 i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",
144 int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c
*ir
, u32
*ir_key
,
147 unsigned char buf
[3];
151 if (3 != i2c_master_recv(&ir
->c
, buf
, 3)) {
152 i2cdprintk("read error\n");
156 i2cdprintk("key %02x\n", buf
[2]&0x3f);
160 *ir_key
= buf
[2]&0x3f;
161 *ir_raw
= buf
[2]&0x3f;
166 /**********************************************************
167 Poll based get keycode functions
168 **********************************************************/
170 /* This is for the em2860/em2880 */
171 static int default_polling_getkey(struct em28xx_IR
*ir
,
172 struct em28xx_ir_poll_result
*poll_result
)
174 struct em28xx
*dev
= ir
->dev
;
176 u8 msg
[3] = { 0, 0, 0 };
178 /* Read key toggle, brand, and key code
179 on registers 0x45, 0x46 and 0x47
181 rc
= dev
->em28xx_read_reg_req_len(dev
, 0, EM28XX_R45_IR
,
186 /* Infrared toggle (Reg 0x45[7]) */
187 poll_result
->toggle_bit
= (msg
[0] >> 7);
189 /* Infrared read count (Reg 0x45[6:0] */
190 poll_result
->read_count
= (msg
[0] & 0x7f);
192 /* Remote Control Address (Reg 0x46) */
193 poll_result
->rc_address
= msg
[1];
195 /* Remote Control Data (Reg 0x47) */
196 poll_result
->rc_data
[0] = msg
[2];
201 static int em2874_polling_getkey(struct em28xx_IR
*ir
,
202 struct em28xx_ir_poll_result
*poll_result
)
204 struct em28xx
*dev
= ir
->dev
;
206 u8 msg
[5] = { 0, 0, 0, 0, 0 };
208 /* Read key toggle, brand, and key code
211 rc
= dev
->em28xx_read_reg_req_len(dev
, 0, EM2874_R51_IR
,
216 /* Infrared toggle (Reg 0x51[7]) */
217 poll_result
->toggle_bit
= (msg
[0] >> 7);
219 /* Infrared read count (Reg 0x51[6:0] */
220 poll_result
->read_count
= (msg
[0] & 0x7f);
222 /* Remote Control Address (Reg 0x52) */
223 poll_result
->rc_address
= msg
[1];
225 /* Remote Control Data (Reg 0x53-55) */
226 poll_result
->rc_data
[0] = msg
[2];
227 poll_result
->rc_data
[1] = msg
[3];
228 poll_result
->rc_data
[2] = msg
[4];
233 /**********************************************************
234 Polling code for em28xx
235 **********************************************************/
237 static void em28xx_ir_handle_key(struct em28xx_IR
*ir
)
241 struct em28xx_ir_poll_result poll_result
;
243 /* read the registers containing the IR status */
244 result
= ir
->get_key(ir
, &poll_result
);
246 dprintk("ir->get_key() failed %d\n", result
);
250 dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
251 poll_result
.toggle_bit
, poll_result
.read_count
,
252 ir
->last_readcount
, poll_result
.rc_data
[0]);
254 if (ir
->dev
->chip_id
== CHIP_ID_EM2874
) {
255 /* The em2874 clears the readcount field every time the
256 register is read. The em2860/2880 datasheet says that it
257 is supposed to clear the readcount, but it doesn't. So with
258 the em2874, we are looking for a non-zero read count as
259 opposed to a readcount that is incrementing */
260 ir
->last_readcount
= 0;
263 if (poll_result
.read_count
== 0) {
264 /* The button has not been pressed since the last read */
265 } else if (ir
->last_toggle
!= poll_result
.toggle_bit
) {
266 /* A button has been pressed */
267 dprintk("button has been pressed\n");
268 ir
->last_toggle
= poll_result
.toggle_bit
;
269 ir
->repeat_interval
= 0;
271 } else if (poll_result
.toggle_bit
== ir
->last_toggle
&&
272 poll_result
.read_count
> 0 &&
273 poll_result
.read_count
!= ir
->last_readcount
) {
274 /* The button is still being held down */
275 dprintk("button being held down\n");
277 /* Debouncer for first keypress */
278 if (ir
->repeat_interval
++ > 9) {
279 /* Start repeating after 1 second */
285 dprintk("sending keypress\n");
286 ir_input_keydown(ir
->input
, &ir
->ir
, poll_result
.rc_data
[0],
287 poll_result
.rc_data
[0]);
288 ir_input_nokey(ir
->input
, &ir
->ir
);
291 ir
->last_readcount
= poll_result
.read_count
;
295 static void ir_timer(unsigned long data
)
297 struct em28xx_IR
*ir
= (struct em28xx_IR
*)data
;
299 schedule_work(&ir
->work
);
302 static void em28xx_ir_work(struct work_struct
*work
)
304 struct em28xx_IR
*ir
= container_of(work
, struct em28xx_IR
, work
);
306 em28xx_ir_handle_key(ir
);
307 mod_timer(&ir
->timer
, jiffies
+ msecs_to_jiffies(ir
->polling
));
310 static void em28xx_ir_start(struct em28xx_IR
*ir
)
312 setup_timer(&ir
->timer
, ir_timer
, (unsigned long)ir
);
313 INIT_WORK(&ir
->work
, em28xx_ir_work
);
314 schedule_work(&ir
->work
);
317 static void em28xx_ir_stop(struct em28xx_IR
*ir
)
319 del_timer_sync(&ir
->timer
);
320 flush_scheduled_work();
323 int em28xx_ir_init(struct em28xx
*dev
)
325 struct em28xx_IR
*ir
;
326 struct input_dev
*input_dev
;
330 if (dev
->board
.ir_codes
== NULL
) {
331 /* No remote control support */
335 ir
= kzalloc(sizeof(*ir
), GFP_KERNEL
);
336 input_dev
= input_allocate_device();
337 if (!ir
|| !input_dev
)
340 ir
->input
= input_dev
;
342 /* Setup the proper handler based on the chip */
343 switch (dev
->chip_id
) {
346 ir
->get_key
= default_polling_getkey
;
349 ir
->get_key
= em2874_polling_getkey
;
350 /* For now we only support RC5, so enable it */
351 ir_config
= EM2874_IR_RC5
;
352 em28xx_write_regs(dev
, EM2874_R50_IR_CONFIG
, &ir_config
, 1);
355 printk("Unrecognized em28xx chip id: IR not supported\n");
359 /* This is how often we ask the chip for IR information */
360 ir
->polling
= 100; /* ms */
362 /* init input device */
363 snprintf(ir
->name
, sizeof(ir
->name
), "em28xx IR (%s)",
366 usb_make_path(dev
->udev
, ir
->phys
, sizeof(ir
->phys
));
367 strlcat(ir
->phys
, "/input0", sizeof(ir
->phys
));
369 ir_input_init(input_dev
, &ir
->ir
, IR_TYPE_OTHER
, dev
->board
.ir_codes
);
370 input_dev
->name
= ir
->name
;
371 input_dev
->phys
= ir
->phys
;
372 input_dev
->id
.bustype
= BUS_USB
;
373 input_dev
->id
.version
= 1;
374 input_dev
->id
.vendor
= le16_to_cpu(dev
->udev
->descriptor
.idVendor
);
375 input_dev
->id
.product
= le16_to_cpu(dev
->udev
->descriptor
.idProduct
);
377 input_dev
->dev
.parent
= &dev
->udev
->dev
;
378 /* record handles to ourself */
385 err
= input_register_device(ir
->input
);
394 input_free_device(input_dev
);
399 int em28xx_ir_fini(struct em28xx
*dev
)
401 struct em28xx_IR
*ir
= dev
->ir
;
403 /* skip detach on non attached boards */
408 input_unregister_device(ir
->input
);
416 /**********************************************************
417 Handle Webcam snapshot button
418 **********************************************************/
420 static void em28xx_query_sbutton(struct work_struct
*work
)
422 /* Poll the register and see if the button is depressed */
424 container_of(work
, struct em28xx
, sbutton_query_work
.work
);
427 ret
= em28xx_read_reg(dev
, EM28XX_R0C_USBSUSP
);
429 if (ret
& EM28XX_R0C_USBSUSP_SNAPSHOT
) {
431 /* Button is depressed, clear the register */
432 cleared
= ((u8
) ret
) & ~EM28XX_R0C_USBSUSP_SNAPSHOT
;
433 em28xx_write_regs(dev
, EM28XX_R0C_USBSUSP
, &cleared
, 1);
435 /* Not emulate the keypress */
436 input_report_key(dev
->sbutton_input_dev
, EM28XX_SNAPSHOT_KEY
,
438 /* Now unpress the key */
439 input_report_key(dev
->sbutton_input_dev
, EM28XX_SNAPSHOT_KEY
,
443 /* Schedule next poll */
444 schedule_delayed_work(&dev
->sbutton_query_work
,
445 msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL
));
448 void em28xx_register_snapshot_button(struct em28xx
*dev
)
450 struct input_dev
*input_dev
;
453 em28xx_info("Registering snapshot button...\n");
454 input_dev
= input_allocate_device();
456 em28xx_errdev("input_allocate_device failed\n");
460 usb_make_path(dev
->udev
, dev
->snapshot_button_path
,
461 sizeof(dev
->snapshot_button_path
));
462 strlcat(dev
->snapshot_button_path
, "/sbutton",
463 sizeof(dev
->snapshot_button_path
));
464 INIT_DELAYED_WORK(&dev
->sbutton_query_work
, em28xx_query_sbutton
);
466 input_dev
->name
= "em28xx snapshot button";
467 input_dev
->phys
= dev
->snapshot_button_path
;
468 input_dev
->evbit
[0] = BIT_MASK(EV_KEY
) | BIT_MASK(EV_REP
);
469 set_bit(EM28XX_SNAPSHOT_KEY
, input_dev
->keybit
);
470 input_dev
->keycodesize
= 0;
471 input_dev
->keycodemax
= 0;
472 input_dev
->id
.bustype
= BUS_USB
;
473 input_dev
->id
.vendor
= le16_to_cpu(dev
->udev
->descriptor
.idVendor
);
474 input_dev
->id
.product
= le16_to_cpu(dev
->udev
->descriptor
.idProduct
);
475 input_dev
->id
.version
= 1;
476 input_dev
->dev
.parent
= &dev
->udev
->dev
;
478 err
= input_register_device(input_dev
);
480 em28xx_errdev("input_register_device failed\n");
481 input_free_device(input_dev
);
485 dev
->sbutton_input_dev
= input_dev
;
486 schedule_delayed_work(&dev
->sbutton_query_work
,
487 msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL
));
492 void em28xx_deregister_snapshot_button(struct em28xx
*dev
)
494 if (dev
->sbutton_input_dev
!= NULL
) {
495 em28xx_info("Deregistering snapshot button\n");
496 cancel_rearming_delayed_work(&dev
->sbutton_query_work
);
497 input_unregister_device(dev
->sbutton_input_dev
);
498 dev
->sbutton_input_dev
= NULL
;