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 delayed_work work;
72 unsigned int last_toggle:1;
73 unsigned int last_readcount;
74 unsigned int repeat_interval;
76 int (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
79 /**********************************************************
80 I2C IR based get keycodes - should be used with ir-kbd-i2c
81 **********************************************************/
83 int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
88 if (1 != i2c_master_recv(&ir->c, &b, 1)) {
89 i2cdprintk("read error\n");
93 /* it seems that 0xFE indicates that a button is still hold
94 down, while 0xff indicates that no button is hold
95 down. 0xfe sequences are sometimes interrupted by 0xFF */
97 i2cdprintk("key %02x\n", b);
111 int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
113 unsigned char buf[2];
117 if (2 != i2c_master_recv(&ir->c, buf, 2))
120 /* Does eliminate repeated parity code */
126 /* Rearranges bits to the right order */
127 code = ((buf[0]&0x01)<<5) | /* 0010 0000 */
128 ((buf[0]&0x02)<<3) | /* 0001 0000 */
129 ((buf[0]&0x04)<<1) | /* 0000 1000 */
130 ((buf[0]&0x08)>>1) | /* 0000 0100 */
131 ((buf[0]&0x10)>>3) | /* 0000 0010 */
132 ((buf[0]&0x20)>>5); /* 0000 0001 */
134 i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",
143 int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
146 unsigned char buf[3];
150 if (3 != i2c_master_recv(&ir->c, buf, 3)) {
151 i2cdprintk("read error\n");
155 i2cdprintk("key %02x\n", buf[2]&0x3f);
159 *ir_key = buf[2]&0x3f;
160 *ir_raw = buf[2]&0x3f;
165 /**********************************************************
166 Poll based get keycode functions
167 **********************************************************/
169 /* This is for the em2860/em2880 */
170 static int default_polling_getkey(struct em28xx_IR *ir,
171 struct em28xx_ir_poll_result *poll_result)
173 struct em28xx *dev = ir->dev;
175 u8 msg[3] = { 0, 0, 0 };
177 /* Read key toggle, brand, and key code
178 on registers 0x45, 0x46 and 0x47
180 rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
185 /* Infrared toggle (Reg 0x45[7]) */
186 poll_result->toggle_bit = (msg[0] >> 7);
188 /* Infrared read count (Reg 0x45[6:0] */
189 poll_result->read_count = (msg[0] & 0x7f);
191 /* Remote Control Address (Reg 0x46) */
192 poll_result->rc_address = msg[1];
194 /* Remote Control Data (Reg 0x47) */
195 poll_result->rc_data[0] = msg[2];
200 static int em2874_polling_getkey(struct em28xx_IR *ir,
201 struct em28xx_ir_poll_result *poll_result)
203 struct em28xx *dev = ir->dev;
205 u8 msg[5] = { 0, 0, 0, 0, 0 };
207 /* Read key toggle, brand, and key code
210 rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
215 /* Infrared toggle (Reg 0x51[7]) */
216 poll_result->toggle_bit = (msg[0] >> 7);
218 /* Infrared read count (Reg 0x51[6:0] */
219 poll_result->read_count = (msg[0] & 0x7f);
221 /* Remote Control Address (Reg 0x52) */
222 poll_result->rc_address = msg[1];
224 /* Remote Control Data (Reg 0x53-55) */
225 poll_result->rc_data[0] = msg[2];
226 poll_result->rc_data[1] = msg[3];
227 poll_result->rc_data[2] = msg[4];
232 /**********************************************************
233 Polling code for em28xx
234 **********************************************************/
236 static void em28xx_ir_handle_key(struct em28xx_IR *ir)
240 struct em28xx_ir_poll_result poll_result;
242 /* read the registers containing the IR status */
243 result = ir->get_key(ir, &poll_result);
245 dprintk("ir->get_key() failed %d\n", result);
249 dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
250 poll_result.toggle_bit, poll_result.read_count,
251 ir->last_readcount, poll_result.rc_data[0]);
253 if (ir->dev->chip_id == CHIP_ID_EM2874) {
254 /* The em2874 clears the readcount field every time the
255 register is read. The em2860/2880 datasheet says that it
256 is supposed to clear the readcount, but it doesn't. So with
257 the em2874, we are looking for a non-zero read count as
258 opposed to a readcount that is incrementing */
259 ir->last_readcount = 0;
262 if (poll_result.read_count == 0) {
263 /* The button has not been pressed since the last read */
264 } else if (ir->last_toggle != poll_result.toggle_bit) {
265 /* A button has been pressed */
266 dprintk("button has been pressed\n");
267 ir->last_toggle = poll_result.toggle_bit;
268 ir->repeat_interval = 0;
270 } else if (poll_result.toggle_bit == ir->last_toggle &&
271 poll_result.read_count > 0 &&
272 poll_result.read_count != ir->last_readcount) {
273 /* The button is still being held down */
274 dprintk("button being held down\n");
276 /* Debouncer for first keypress */
277 if (ir->repeat_interval++ > 9) {
278 /* Start repeating after 1 second */
284 dprintk("sending keypress\n");
285 ir_input_keydown(ir->input, &ir->ir, poll_result.rc_data[0],
286 poll_result.rc_data[0]);
287 ir_input_nokey(ir->input, &ir->ir);
290 ir->last_readcount = poll_result.read_count;
294 static void em28xx_ir_work(struct work_struct *work)
296 struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
298 em28xx_ir_handle_key(ir);
299 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
302 static void em28xx_ir_start(struct em28xx_IR *ir)
304 INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
305 schedule_delayed_work(&ir->work, 0);
308 static void em28xx_ir_stop(struct em28xx_IR *ir)
310 cancel_delayed_work_sync(&ir->work);
313 int em28xx_ir_init(struct em28xx *dev)
315 struct em28xx_IR *ir;
316 struct input_dev *input_dev;
320 if (dev->board.ir_codes == NULL) {
321 /* No remote control support */
325 ir = kzalloc(sizeof(*ir), GFP_KERNEL);
326 input_dev = input_allocate_device();
327 if (!ir || !input_dev)
330 ir->input = input_dev;
332 /* Setup the proper handler based on the chip */
333 switch (dev->chip_id) {
336 ir->get_key = default_polling_getkey;
339 ir->get_key = em2874_polling_getkey;
340 /* For now we only support RC5, so enable it */
341 ir_config = EM2874_IR_RC5;
342 em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
345 printk("Unrecognized em28xx chip id: IR not supported\n");
349 /* This is how often we ask the chip for IR information */
350 ir->polling = 100; /* ms */
352 /* init input device */
353 snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)",
356 usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
357 strlcat(ir->phys, "/input0", sizeof(ir->phys));
359 ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER, dev->board.ir_codes);
360 input_dev->name = ir->name;
361 input_dev->phys = ir->phys;
362 input_dev->id.bustype = BUS_USB;
363 input_dev->id.version = 1;
364 input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
365 input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
367 input_dev->dev.parent = &dev->udev->dev;
368 /* record handles to ourself */
375 err = input_register_device(ir->input);
384 input_free_device(input_dev);
389 int em28xx_ir_fini(struct em28xx *dev)
391 struct em28xx_IR *ir = dev->ir;
393 /* skip detach on non attached boards */
398 input_unregister_device(ir->input);
406 /**********************************************************
407 Handle Webcam snapshot button
408 **********************************************************/
410 static void em28xx_query_sbutton(struct work_struct *work)
412 /* Poll the register and see if the button is depressed */
414 container_of(work, struct em28xx, sbutton_query_work.work);
417 ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
419 if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
421 /* Button is depressed, clear the register */
422 cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
423 em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
425 /* Not emulate the keypress */
426 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
428 /* Now unpress the key */
429 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
433 /* Schedule next poll */
434 schedule_delayed_work(&dev->sbutton_query_work,
435 msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
438 void em28xx_register_snapshot_button(struct em28xx *dev)
440 struct input_dev *input_dev;
443 em28xx_info("Registering snapshot button...\n");
444 input_dev = input_allocate_device();
446 em28xx_errdev("input_allocate_device failed\n");
450 usb_make_path(dev->udev, dev->snapshot_button_path,
451 sizeof(dev->snapshot_button_path));
452 strlcat(dev->snapshot_button_path, "/sbutton",
453 sizeof(dev->snapshot_button_path));
454 INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
456 input_dev->name = "em28xx snapshot button";
457 input_dev->phys = dev->snapshot_button_path;
458 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
459 set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
460 input_dev->keycodesize = 0;
461 input_dev->keycodemax = 0;
462 input_dev->id.bustype = BUS_USB;
463 input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
464 input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
465 input_dev->id.version = 1;
466 input_dev->dev.parent = &dev->udev->dev;
468 err = input_register_device(input_dev);
470 em28xx_errdev("input_register_device failed\n");
471 input_free_device(input_dev);
475 dev->sbutton_input_dev = input_dev;
476 schedule_delayed_work(&dev->sbutton_query_work,
477 msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
482 void em28xx_deregister_snapshot_button(struct em28xx *dev)
484 if (dev->sbutton_input_dev != NULL) {
485 em28xx_info("Deregistering snapshot button\n");
486 cancel_rearming_delayed_work(&dev->sbutton_query_work);
487 input_unregister_device(dev->sbutton_input_dev);
488 dev->sbutton_input_dev = NULL;