1 /*
2 * Pulse Eight HDMI CEC driver
3 *
4 * Copyright 2016 Hans Verkuil <hverkuil@xs4all.nl
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version of 2 of the License, or (at your
9 * option) any later version. See the file COPYING in the main directory of
10 * this archive for more details.
11 */
12
13 /*
14 * Notes:
15 *
16 * - Devices with firmware version < 2 do not store their configuration in
17 * EEPROM.
18 *
19 * - In autonomous mode, only messages from a TV will be acknowledged, even
20 * polling messages. Upon receiving a message from a TV, the dongle will
21 * respond to messages from any logical address.
22 *
23 * - In autonomous mode, the dongle will by default reply Feature Abort
24 * [Unrecognized Opcode] when it receives Give Device Vendor ID. It will
25 * however observe vendor ID's reported by other devices and possibly
26 * alter this behavior. When TV's (and TV's only) report that their vendor ID
27 * is LG (0x00e091), the dongle will itself reply that it has the same vendor
28 * ID, and it will respond to at least one vendor specific command.
29 *
30 * - In autonomous mode, the dongle is known to attempt wakeup if it receives
31 * <User Control Pressed> ["Power On"], ["Power] or ["Power Toggle"], or if it
32 * receives <Set Stream Path> with its own physical address. It also does this
33 * if it receives <Vendor Specific Command> [0x03 0x00] from an LG TV.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/init.h>
38 #include <linux/interrupt.h>
39 #include <linux/kernel.h>
40 #include <linux/module.h>
41 #include <linux/workqueue.h>
42 #include <linux/serio.h>
43 #include <linux/slab.h>
44 #include <linux/time.h>
45 #include <linux/delay.h>
46
47 #include <media/cec.h>
48
49 MODULE_AUTHOR("Hans Verkuil <hverkuil@xs4all.nl>");
50 MODULE_DESCRIPTION("Pulse Eight HDMI CEC driver");
51 MODULE_LICENSE("GPL");
52
53 static int debug;
54 static int persistent_config;
55 module_param(debug, int, 0644);
56 module_param(persistent_config, int, 0644);
57 MODULE_PARM_DESC(debug, "debug level (0-1)");
58 MODULE_PARM_DESC(persistent_config, "read config from persistent memory (0-1)");
59
60 enum pulse8_msgcodes {
61 MSGCODE_NOTHING = 0,
62 MSGCODE_PING,
63 MSGCODE_TIMEOUT_ERROR,
64 MSGCODE_HIGH_ERROR,
65 MSGCODE_LOW_ERROR,
66 MSGCODE_FRAME_START,
67 MSGCODE_FRAME_DATA,
68 MSGCODE_RECEIVE_FAILED,
69 MSGCODE_COMMAND_ACCEPTED, /* 0x08 */
70 MSGCODE_COMMAND_REJECTED,
71 MSGCODE_SET_ACK_MASK,
72 MSGCODE_TRANSMIT,
73 MSGCODE_TRANSMIT_EOM,
74 MSGCODE_TRANSMIT_IDLETIME,
75 MSGCODE_TRANSMIT_ACK_POLARITY,
76 MSGCODE_TRANSMIT_LINE_TIMEOUT,
77 MSGCODE_TRANSMIT_SUCCEEDED, /* 0x10 */
78 MSGCODE_TRANSMIT_FAILED_LINE,
79 MSGCODE_TRANSMIT_FAILED_ACK,
80 MSGCODE_TRANSMIT_FAILED_TIMEOUT_DATA,
81 MSGCODE_TRANSMIT_FAILED_TIMEOUT_LINE,
82 MSGCODE_FIRMWARE_VERSION,
83 MSGCODE_START_BOOTLOADER,
84 MSGCODE_GET_BUILDDATE,
85 MSGCODE_SET_CONTROLLED, /* 0x18 */
86 MSGCODE_GET_AUTO_ENABLED,
87 MSGCODE_SET_AUTO_ENABLED,
88 MSGCODE_GET_DEFAULT_LOGICAL_ADDRESS,
89 MSGCODE_SET_DEFAULT_LOGICAL_ADDRESS,
90 MSGCODE_GET_LOGICAL_ADDRESS_MASK,
91 MSGCODE_SET_LOGICAL_ADDRESS_MASK,
92 MSGCODE_GET_PHYSICAL_ADDRESS,
93 MSGCODE_SET_PHYSICAL_ADDRESS, /* 0x20 */
94 MSGCODE_GET_DEVICE_TYPE,
95 MSGCODE_SET_DEVICE_TYPE,
96 MSGCODE_GET_HDMI_VERSION,
97 MSGCODE_SET_HDMI_VERSION,
98 MSGCODE_GET_OSD_NAME,
99 MSGCODE_SET_OSD_NAME,
100 MSGCODE_WRITE_EEPROM,
101 MSGCODE_GET_ADAPTER_TYPE, /* 0x28 */
102 MSGCODE_SET_ACTIVE_SOURCE,
103
104 MSGCODE_FRAME_EOM = 0x80,
105 MSGCODE_FRAME_ACK = 0x40,
106 };
107
108 #define MSGSTART 0xff
109 #define MSGEND 0xfe
110 #define MSGESC 0xfd
111 #define MSGOFFSET 3
112
113 #define DATA_SIZE 256
114
115 #define PING_PERIOD (15 * HZ)
116
117 struct pulse8 {
118 struct device *dev;
119 struct serio *serio;
120 struct cec_adapter *adap;
121 unsigned int vers;
122 struct completion cmd_done;
123 struct work_struct work;
124 struct delayed_work ping_eeprom_work;
125 struct cec_msg rx_msg;
126 u8 data[DATA_SIZE];
127 unsigned int len;
128 u8 buf[DATA_SIZE];
129 unsigned int idx;
130 bool escape;
131 bool started;
132 struct mutex config_lock;
133 struct mutex write_lock;
134 bool config_pending;
135 bool restoring_config;
136 bool autonomous;
137 };
138
139 static void pulse8_ping_eeprom_work_handler(struct work_struct *work);
140
pulse8_irq_work_handler(struct work_struct * work)141 static void pulse8_irq_work_handler(struct work_struct *work)
142 {
143 struct pulse8 *pulse8 =
144 container_of(work, struct pulse8, work);
145
146 switch (pulse8->data[0] & 0x3f) {
147 case MSGCODE_FRAME_DATA:
148 cec_received_msg(pulse8->adap, &pulse8->rx_msg);
149 break;
150 case MSGCODE_TRANSMIT_SUCCEEDED:
151 cec_transmit_attempt_done(pulse8->adap, CEC_TX_STATUS_OK);
152 break;
153 case MSGCODE_TRANSMIT_FAILED_ACK:
154 cec_transmit_attempt_done(pulse8->adap, CEC_TX_STATUS_NACK);
155 break;
156 case MSGCODE_TRANSMIT_FAILED_LINE:
157 case MSGCODE_TRANSMIT_FAILED_TIMEOUT_DATA:
158 case MSGCODE_TRANSMIT_FAILED_TIMEOUT_LINE:
159 cec_transmit_attempt_done(pulse8->adap, CEC_TX_STATUS_ERROR);
160 break;
161 }
162 }
163
pulse8_interrupt(struct serio * serio,unsigned char data,unsigned int flags)164 static irqreturn_t pulse8_interrupt(struct serio *serio, unsigned char data,
165 unsigned int flags)
166 {
167 struct pulse8 *pulse8 = serio_get_drvdata(serio);
168
169 if (!pulse8->started && data != MSGSTART)
170 return IRQ_HANDLED;
171 if (data == MSGESC) {
172 pulse8->escape = true;
173 return IRQ_HANDLED;
174 }
175 if (pulse8->escape) {
176 data += MSGOFFSET;
177 pulse8->escape = false;
178 } else if (data == MSGEND) {
179 struct cec_msg *msg = &pulse8->rx_msg;
180
181 if (debug)
182 dev_info(pulse8->dev, "received: %*ph\n",
183 pulse8->idx, pulse8->buf);
184 pulse8->data[0] = pulse8->buf[0];
185 switch (pulse8->buf[0] & 0x3f) {
186 case MSGCODE_FRAME_START:
187 msg->len = 1;
188 msg->msg[0] = pulse8->buf[1];
189 break;
190 case MSGCODE_FRAME_DATA:
191 if (msg->len == CEC_MAX_MSG_SIZE)
192 break;
193 msg->msg[msg->len++] = pulse8->buf[1];
194 if (pulse8->buf[0] & MSGCODE_FRAME_EOM)
195 schedule_work(&pulse8->work);
196 break;
197 case MSGCODE_TRANSMIT_SUCCEEDED:
198 case MSGCODE_TRANSMIT_FAILED_LINE:
199 case MSGCODE_TRANSMIT_FAILED_ACK:
200 case MSGCODE_TRANSMIT_FAILED_TIMEOUT_DATA:
201 case MSGCODE_TRANSMIT_FAILED_TIMEOUT_LINE:
202 schedule_work(&pulse8->work);
203 break;
204 case MSGCODE_HIGH_ERROR:
205 case MSGCODE_LOW_ERROR:
206 case MSGCODE_RECEIVE_FAILED:
207 case MSGCODE_TIMEOUT_ERROR:
208 break;
209 case MSGCODE_COMMAND_ACCEPTED:
210 case MSGCODE_COMMAND_REJECTED:
211 default:
212 if (pulse8->idx == 0)
213 break;
214 memcpy(pulse8->data, pulse8->buf, pulse8->idx);
215 pulse8->len = pulse8->idx;
216 complete(&pulse8->cmd_done);
217 break;
218 }
219 pulse8->idx = 0;
220 pulse8->started = false;
221 return IRQ_HANDLED;
222 } else if (data == MSGSTART) {
223 pulse8->idx = 0;
224 pulse8->started = true;
225 return IRQ_HANDLED;
226 }
227
228 if (pulse8->idx >= DATA_SIZE) {
229 dev_dbg(pulse8->dev,
230 "throwing away %d bytes of garbage\n", pulse8->idx);
231 pulse8->idx = 0;
232 }
233 pulse8->buf[pulse8->idx++] = data;
234 return IRQ_HANDLED;
235 }
236
pulse8_disconnect(struct serio * serio)237 static void pulse8_disconnect(struct serio *serio)
238 {
239 struct pulse8 *pulse8 = serio_get_drvdata(serio);
240
241 cec_unregister_adapter(pulse8->adap);
242 cancel_delayed_work_sync(&pulse8->ping_eeprom_work);
243 dev_info(&serio->dev, "disconnected\n");
244 serio_close(serio);
245 serio_set_drvdata(serio, NULL);
246 kfree(pulse8);
247 }
248
pulse8_send(struct serio * serio,const u8 * command,u8 cmd_len)249 static int pulse8_send(struct serio *serio, const u8 *command, u8 cmd_len)
250 {
251 int err = 0;
252
253 err = serio_write(serio, MSGSTART);
254 if (err)
255 return err;
256 for (; !err && cmd_len; command++, cmd_len--) {
257 if (*command >= MSGESC) {
258 err = serio_write(serio, MSGESC);
259 if (!err)
260 err = serio_write(serio, *command - MSGOFFSET);
261 } else {
262 err = serio_write(serio, *command);
263 }
264 }
265 if (!err)
266 err = serio_write(serio, MSGEND);
267
268 return err;
269 }
270
pulse8_send_and_wait_once(struct pulse8 * pulse8,const u8 * cmd,u8 cmd_len,u8 response,u8 size)271 static int pulse8_send_and_wait_once(struct pulse8 *pulse8,
272 const u8 *cmd, u8 cmd_len,
273 u8 response, u8 size)
274 {
275 int err;
276
277 /*dev_info(pulse8->dev, "transmit: %*ph\n", cmd_len, cmd);*/
278 init_completion(&pulse8->cmd_done);
279
280 err = pulse8_send(pulse8->serio, cmd, cmd_len);
281 if (err)
282 return err;
283
284 if (!wait_for_completion_timeout(&pulse8->cmd_done, HZ))
285 return -ETIMEDOUT;
286 if ((pulse8->data[0] & 0x3f) == MSGCODE_COMMAND_REJECTED &&
287 cmd[0] != MSGCODE_SET_CONTROLLED &&
288 cmd[0] != MSGCODE_SET_AUTO_ENABLED &&
289 cmd[0] != MSGCODE_GET_BUILDDATE)
290 return -ENOTTY;
291 if (response &&
292 ((pulse8->data[0] & 0x3f) != response || pulse8->len < size + 1)) {
293 dev_info(pulse8->dev, "transmit: failed %02x\n",
294 pulse8->data[0] & 0x3f);
295 return -EIO;
296 }
297 return 0;
298 }
299
pulse8_send_and_wait(struct pulse8 * pulse8,const u8 * cmd,u8 cmd_len,u8 response,u8 size)300 static int pulse8_send_and_wait(struct pulse8 *pulse8,
301 const u8 *cmd, u8 cmd_len, u8 response, u8 size)
302 {
303 u8 cmd_sc[2];
304 int err;
305
306 mutex_lock(&pulse8->write_lock);
307 err = pulse8_send_and_wait_once(pulse8, cmd, cmd_len, response, size);
308
309 if (err == -ENOTTY) {
310 cmd_sc[0] = MSGCODE_SET_CONTROLLED;
311 cmd_sc[1] = 1;
312 err = pulse8_send_and_wait_once(pulse8, cmd_sc, 2,
313 MSGCODE_COMMAND_ACCEPTED, 1);
314 if (err)
315 goto unlock;
316 err = pulse8_send_and_wait_once(pulse8, cmd, cmd_len,
317 response, size);
318 }
319
320 unlock:
321 mutex_unlock(&pulse8->write_lock);
322 return err == -ENOTTY ? -EIO : err;
323 }
324
pulse8_setup(struct pulse8 * pulse8,struct serio * serio,struct cec_log_addrs * log_addrs,u16 * pa)325 static int pulse8_setup(struct pulse8 *pulse8, struct serio *serio,
326 struct cec_log_addrs *log_addrs, u16 *pa)
327 {
328 u8 *data = pulse8->data + 1;
329 u8 cmd[2];
330 int err;
331 struct tm tm;
332 time64_t date;
333
334 pulse8->vers = 0;
335
336 cmd[0] = MSGCODE_FIRMWARE_VERSION;
337 err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 2);
338 if (err)
339 return err;
340 pulse8->vers = (data[0] << 8) | data[1];
341 dev_info(pulse8->dev, "Firmware version %04x\n", pulse8->vers);
342 if (pulse8->vers < 2) {
343 *pa = CEC_PHYS_ADDR_INVALID;
344 return 0;
345 }
346
347 cmd[0] = MSGCODE_GET_BUILDDATE;
348 err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 4);
349 if (err)
350 return err;
351 date = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
352 time64_to_tm(date, 0, &tm);
353 dev_info(pulse8->dev, "Firmware build date %04ld.%02d.%02d %02d:%02d:%02d\n",
354 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
355 tm.tm_hour, tm.tm_min, tm.tm_sec);
356
357 dev_dbg(pulse8->dev, "Persistent config:\n");
358 cmd[0] = MSGCODE_GET_AUTO_ENABLED;
359 err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 1);
360 if (err)
361 return err;
362 pulse8->autonomous = data[0];
363 dev_dbg(pulse8->dev, "Autonomous mode: %s",
364 data[0] ? "on" : "off");
365
366 cmd[0] = MSGCODE_GET_DEVICE_TYPE;
367 err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 1);
368 if (err)
369 return err;
370 log_addrs->primary_device_type[0] = data[0];
371 dev_dbg(pulse8->dev, "Primary device type: %d\n", data[0]);
372 switch (log_addrs->primary_device_type[0]) {
373 case CEC_OP_PRIM_DEVTYPE_TV:
374 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_TV;
375 log_addrs->all_device_types[0] = CEC_OP_ALL_DEVTYPE_TV;
376 break;
377 case CEC_OP_PRIM_DEVTYPE_RECORD:
378 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_RECORD;
379 log_addrs->all_device_types[0] = CEC_OP_ALL_DEVTYPE_RECORD;
380 break;
381 case CEC_OP_PRIM_DEVTYPE_TUNER:
382 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_TUNER;
383 log_addrs->all_device_types[0] = CEC_OP_ALL_DEVTYPE_TUNER;
384 break;
385 case CEC_OP_PRIM_DEVTYPE_PLAYBACK:
386 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_PLAYBACK;
387 log_addrs->all_device_types[0] = CEC_OP_ALL_DEVTYPE_PLAYBACK;
388 break;
389 case CEC_OP_PRIM_DEVTYPE_AUDIOSYSTEM:
390 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_PLAYBACK;
391 log_addrs->all_device_types[0] = CEC_OP_ALL_DEVTYPE_AUDIOSYSTEM;
392 break;
393 case CEC_OP_PRIM_DEVTYPE_SWITCH:
394 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_UNREGISTERED;
395 log_addrs->all_device_types[0] = CEC_OP_ALL_DEVTYPE_SWITCH;
396 break;
397 case CEC_OP_PRIM_DEVTYPE_PROCESSOR:
398 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_SPECIFIC;
399 log_addrs->all_device_types[0] = CEC_OP_ALL_DEVTYPE_SWITCH;
400 break;
401 default:
402 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_UNREGISTERED;
403 log_addrs->all_device_types[0] = CEC_OP_ALL_DEVTYPE_SWITCH;
404 dev_info(pulse8->dev, "Unknown Primary Device Type: %d\n",
405 log_addrs->primary_device_type[0]);
406 break;
407 }
408
409 cmd[0] = MSGCODE_GET_LOGICAL_ADDRESS_MASK;
410 err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 2);
411 if (err)
412 return err;
413 log_addrs->log_addr_mask = (data[0] << 8) | data[1];
414 dev_dbg(pulse8->dev, "Logical address ACK mask: %x\n",
415 log_addrs->log_addr_mask);
416 if (log_addrs->log_addr_mask)
417 log_addrs->num_log_addrs = 1;
418
419 cmd[0] = MSGCODE_GET_PHYSICAL_ADDRESS;
420 err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 1);
421 if (err)
422 return err;
423 *pa = (data[0] << 8) | data[1];
424 dev_dbg(pulse8->dev, "Physical address: %x.%x.%x.%x\n",
425 cec_phys_addr_exp(*pa));
426
427 cmd[0] = MSGCODE_GET_HDMI_VERSION;
428 err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 1);
429 if (err)
430 return err;
431 log_addrs->cec_version = data[0];
432 dev_dbg(pulse8->dev, "CEC version: %d\n", log_addrs->cec_version);
433
434 cmd[0] = MSGCODE_GET_OSD_NAME;
435 err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 0);
436 if (err)
437 return err;
438 strncpy(log_addrs->osd_name, data, 13);
439 dev_dbg(pulse8->dev, "OSD name: %s\n", log_addrs->osd_name);
440
441 return 0;
442 }
443
pulse8_apply_persistent_config(struct pulse8 * pulse8,struct cec_log_addrs * log_addrs,u16 pa)444 static int pulse8_apply_persistent_config(struct pulse8 *pulse8,
445 struct cec_log_addrs *log_addrs,
446 u16 pa)
447 {
448 int err;
449
450 err = cec_s_log_addrs(pulse8->adap, log_addrs, false);
451 if (err)
452 return err;
453
454 cec_s_phys_addr(pulse8->adap, pa, false);
455
456 return 0;
457 }
458
pulse8_cec_adap_enable(struct cec_adapter * adap,bool enable)459 static int pulse8_cec_adap_enable(struct cec_adapter *adap, bool enable)
460 {
461 struct pulse8 *pulse8 = cec_get_drvdata(adap);
462 u8 cmd[16];
463 int err;
464
465 cmd[0] = MSGCODE_SET_CONTROLLED;
466 cmd[1] = enable;
467 err = pulse8_send_and_wait(pulse8, cmd, 2,
468 MSGCODE_COMMAND_ACCEPTED, 1);
469 return enable ? err : 0;
470 }
471
pulse8_cec_adap_log_addr(struct cec_adapter * adap,u8 log_addr)472 static int pulse8_cec_adap_log_addr(struct cec_adapter *adap, u8 log_addr)
473 {
474 struct pulse8 *pulse8 = cec_get_drvdata(adap);
475 u16 mask = 0;
476 u16 pa = adap->phys_addr;
477 u8 cmd[16];
478 int err = 0;
479
480 mutex_lock(&pulse8->config_lock);
481 if (log_addr != CEC_LOG_ADDR_INVALID)
482 mask = 1 << log_addr;
483 cmd[0] = MSGCODE_SET_ACK_MASK;
484 cmd[1] = mask >> 8;
485 cmd[2] = mask & 0xff;
486 err = pulse8_send_and_wait(pulse8, cmd, 3,
487 MSGCODE_COMMAND_ACCEPTED, 0);
488 if ((err && mask != 0) || pulse8->restoring_config)
489 goto unlock;
490
491 cmd[0] = MSGCODE_SET_AUTO_ENABLED;
492 cmd[1] = log_addr == CEC_LOG_ADDR_INVALID ? 0 : 1;
493 err = pulse8_send_and_wait(pulse8, cmd, 2,
494 MSGCODE_COMMAND_ACCEPTED, 0);
495 if (err)
496 goto unlock;
497 pulse8->autonomous = cmd[1];
498 if (log_addr == CEC_LOG_ADDR_INVALID)
499 goto unlock;
500
501 cmd[0] = MSGCODE_SET_DEVICE_TYPE;
502 cmd[1] = adap->log_addrs.primary_device_type[0];
503 err = pulse8_send_and_wait(pulse8, cmd, 2,
504 MSGCODE_COMMAND_ACCEPTED, 0);
505 if (err)
506 goto unlock;
507
508 switch (adap->log_addrs.primary_device_type[0]) {
509 case CEC_OP_PRIM_DEVTYPE_TV:
510 mask = CEC_LOG_ADDR_MASK_TV;
511 break;
512 case CEC_OP_PRIM_DEVTYPE_RECORD:
513 mask = CEC_LOG_ADDR_MASK_RECORD;
514 break;
515 case CEC_OP_PRIM_DEVTYPE_TUNER:
516 mask = CEC_LOG_ADDR_MASK_TUNER;
517 break;
518 case CEC_OP_PRIM_DEVTYPE_PLAYBACK:
519 mask = CEC_LOG_ADDR_MASK_PLAYBACK;
520 break;
521 case CEC_OP_PRIM_DEVTYPE_AUDIOSYSTEM:
522 mask = CEC_LOG_ADDR_MASK_AUDIOSYSTEM;
523 break;
524 case CEC_OP_PRIM_DEVTYPE_SWITCH:
525 mask = CEC_LOG_ADDR_MASK_UNREGISTERED;
526 break;
527 case CEC_OP_PRIM_DEVTYPE_PROCESSOR:
528 mask = CEC_LOG_ADDR_MASK_SPECIFIC;
529 break;
530 default:
531 mask = 0;
532 break;
533 }
534 cmd[0] = MSGCODE_SET_LOGICAL_ADDRESS_MASK;
535 cmd[1] = mask >> 8;
536 cmd[2] = mask & 0xff;
537 err = pulse8_send_and_wait(pulse8, cmd, 3,
538 MSGCODE_COMMAND_ACCEPTED, 0);
539 if (err)
540 goto unlock;
541
542 cmd[0] = MSGCODE_SET_DEFAULT_LOGICAL_ADDRESS;
543 cmd[1] = log_addr;
544 err = pulse8_send_and_wait(pulse8, cmd, 2,
545 MSGCODE_COMMAND_ACCEPTED, 0);
546 if (err)
547 goto unlock;
548
549 cmd[0] = MSGCODE_SET_PHYSICAL_ADDRESS;
550 cmd[1] = pa >> 8;
551 cmd[2] = pa & 0xff;
552 err = pulse8_send_and_wait(pulse8, cmd, 3,
553 MSGCODE_COMMAND_ACCEPTED, 0);
554 if (err)
555 goto unlock;
556
557 cmd[0] = MSGCODE_SET_HDMI_VERSION;
558 cmd[1] = adap->log_addrs.cec_version;
559 err = pulse8_send_and_wait(pulse8, cmd, 2,
560 MSGCODE_COMMAND_ACCEPTED, 0);
561 if (err)
562 goto unlock;
563
564 if (adap->log_addrs.osd_name[0]) {
565 size_t osd_len = strlen(adap->log_addrs.osd_name);
566 char *osd_str = cmd + 1;
567
568 cmd[0] = MSGCODE_SET_OSD_NAME;
569 strncpy(cmd + 1, adap->log_addrs.osd_name, 13);
570 if (osd_len < 4) {
571 memset(osd_str + osd_len, ' ', 4 - osd_len);
572 osd_len = 4;
573 osd_str[osd_len] = '\0';
574 strcpy(adap->log_addrs.osd_name, osd_str);
575 }
576 err = pulse8_send_and_wait(pulse8, cmd, 1 + osd_len,
577 MSGCODE_COMMAND_ACCEPTED, 0);
578 if (err)
579 goto unlock;
580 }
581
582 unlock:
583 if (pulse8->restoring_config)
584 pulse8->restoring_config = false;
585 else
586 pulse8->config_pending = true;
587 mutex_unlock(&pulse8->config_lock);
588 return err;
589 }
590
pulse8_cec_adap_transmit(struct cec_adapter * adap,u8 attempts,u32 signal_free_time,struct cec_msg * msg)591 static int pulse8_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
592 u32 signal_free_time, struct cec_msg *msg)
593 {
594 struct pulse8 *pulse8 = cec_get_drvdata(adap);
595 u8 cmd[2];
596 unsigned int i;
597 int err;
598
599 cmd[0] = MSGCODE_TRANSMIT_IDLETIME;
600 cmd[1] = signal_free_time;
601 err = pulse8_send_and_wait(pulse8, cmd, 2,
602 MSGCODE_COMMAND_ACCEPTED, 1);
603 cmd[0] = MSGCODE_TRANSMIT_ACK_POLARITY;
604 cmd[1] = cec_msg_is_broadcast(msg);
605 if (!err)
606 err = pulse8_send_and_wait(pulse8, cmd, 2,
607 MSGCODE_COMMAND_ACCEPTED, 1);
608 cmd[0] = msg->len == 1 ? MSGCODE_TRANSMIT_EOM : MSGCODE_TRANSMIT;
609 cmd[1] = msg->msg[0];
610 if (!err)
611 err = pulse8_send_and_wait(pulse8, cmd, 2,
612 MSGCODE_COMMAND_ACCEPTED, 1);
613 if (!err && msg->len > 1) {
614 cmd[0] = msg->len == 2 ? MSGCODE_TRANSMIT_EOM :
615 MSGCODE_TRANSMIT;
616 cmd[1] = msg->msg[1];
617 err = pulse8_send_and_wait(pulse8, cmd, 2,
618 MSGCODE_COMMAND_ACCEPTED, 1);
619 for (i = 0; !err && i + 2 < msg->len; i++) {
620 cmd[0] = (i + 2 == msg->len - 1) ?
621 MSGCODE_TRANSMIT_EOM : MSGCODE_TRANSMIT;
622 cmd[1] = msg->msg[i + 2];
623 err = pulse8_send_and_wait(pulse8, cmd, 2,
624 MSGCODE_COMMAND_ACCEPTED, 1);
625 }
626 }
627
628 return err;
629 }
630
pulse8_received(struct cec_adapter * adap,struct cec_msg * msg)631 static int pulse8_received(struct cec_adapter *adap, struct cec_msg *msg)
632 {
633 return -ENOMSG;
634 }
635
636 static const struct cec_adap_ops pulse8_cec_adap_ops = {
637 .adap_enable = pulse8_cec_adap_enable,
638 .adap_log_addr = pulse8_cec_adap_log_addr,
639 .adap_transmit = pulse8_cec_adap_transmit,
640 .received = pulse8_received,
641 };
642
pulse8_connect(struct serio * serio,struct serio_driver * drv)643 static int pulse8_connect(struct serio *serio, struct serio_driver *drv)
644 {
645 u32 caps = CEC_CAP_DEFAULTS | CEC_CAP_PHYS_ADDR | CEC_CAP_MONITOR_ALL;
646 struct pulse8 *pulse8;
647 int err = -ENOMEM;
648 struct cec_log_addrs log_addrs = {};
649 u16 pa = CEC_PHYS_ADDR_INVALID;
650
651 pulse8 = kzalloc(sizeof(*pulse8), GFP_KERNEL);
652
653 if (!pulse8)
654 return -ENOMEM;
655
656 pulse8->serio = serio;
657 pulse8->adap = cec_allocate_adapter(&pulse8_cec_adap_ops, pulse8,
658 dev_name(&serio->dev), caps, 1);
659 err = PTR_ERR_OR_ZERO(pulse8->adap);
660 if (err < 0)
661 goto free_device;
662
663 pulse8->dev = &serio->dev;
664 serio_set_drvdata(serio, pulse8);
665 INIT_WORK(&pulse8->work, pulse8_irq_work_handler);
666 mutex_init(&pulse8->write_lock);
667 mutex_init(&pulse8->config_lock);
668 pulse8->config_pending = false;
669
670 err = serio_open(serio, drv);
671 if (err)
672 goto delete_adap;
673
674 err = pulse8_setup(pulse8, serio, &log_addrs, &pa);
675 if (err)
676 goto close_serio;
677
678 err = cec_register_adapter(pulse8->adap, &serio->dev);
679 if (err < 0)
680 goto close_serio;
681
682 pulse8->dev = &pulse8->adap->devnode.dev;
683
684 if (persistent_config && pulse8->autonomous) {
685 err = pulse8_apply_persistent_config(pulse8, &log_addrs, pa);
686 if (err)
687 goto close_serio;
688 pulse8->restoring_config = true;
689 }
690
691 INIT_DELAYED_WORK(&pulse8->ping_eeprom_work,
692 pulse8_ping_eeprom_work_handler);
693 schedule_delayed_work(&pulse8->ping_eeprom_work, PING_PERIOD);
694
695 return 0;
696
697 close_serio:
698 serio_close(serio);
699 delete_adap:
700 cec_delete_adapter(pulse8->adap);
701 serio_set_drvdata(serio, NULL);
702 free_device:
703 kfree(pulse8);
704 return err;
705 }
706
pulse8_ping_eeprom_work_handler(struct work_struct * work)707 static void pulse8_ping_eeprom_work_handler(struct work_struct *work)
708 {
709 struct pulse8 *pulse8 =
710 container_of(work, struct pulse8, ping_eeprom_work.work);
711 u8 cmd;
712
713 schedule_delayed_work(&pulse8->ping_eeprom_work, PING_PERIOD);
714 cmd = MSGCODE_PING;
715 pulse8_send_and_wait(pulse8, &cmd, 1,
716 MSGCODE_COMMAND_ACCEPTED, 0);
717
718 if (pulse8->vers < 2)
719 return;
720
721 mutex_lock(&pulse8->config_lock);
722 if (pulse8->config_pending && persistent_config) {
723 dev_dbg(pulse8->dev, "writing pending config to EEPROM\n");
724 cmd = MSGCODE_WRITE_EEPROM;
725 if (pulse8_send_and_wait(pulse8, &cmd, 1,
726 MSGCODE_COMMAND_ACCEPTED, 0))
727 dev_info(pulse8->dev, "failed to write pending config to EEPROM\n");
728 else
729 pulse8->config_pending = false;
730 }
731 mutex_unlock(&pulse8->config_lock);
732 }
733
734 static const struct serio_device_id pulse8_serio_ids[] = {
735 {
736 .type = SERIO_RS232,
737 .proto = SERIO_PULSE8_CEC,
738 .id = SERIO_ANY,
739 .extra = SERIO_ANY,
740 },
741 { 0 }
742 };
743
744 MODULE_DEVICE_TABLE(serio, pulse8_serio_ids);
745
746 static struct serio_driver pulse8_drv = {
747 .driver = {
748 .name = "pulse8-cec",
749 },
750 .description = "Pulse Eight HDMI CEC driver",
751 .id_table = pulse8_serio_ids,
752 .interrupt = pulse8_interrupt,
753 .connect = pulse8_connect,
754 .disconnect = pulse8_disconnect,
755 };
756
757 module_serio_driver(pulse8_drv);
758
