drivers/staging/media/pulse8-cec/pulse8-cec.c

   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 = 1;
  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
 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_done(pulse8->adap, CEC_TX_STATUS_OK,
 152                                   0, 0, 0, 0);
 153                 break;
 154         case MSGCODE_TRANSMIT_FAILED_ACK:
 155                 cec_transmit_done(pulse8->adap, CEC_TX_STATUS_NACK,
 156                                   0, 1, 0, 0);
 157                 break;
 158         case MSGCODE_TRANSMIT_FAILED_LINE:
 159         case MSGCODE_TRANSMIT_FAILED_TIMEOUT_DATA:
 160         case MSGCODE_TRANSMIT_FAILED_TIMEOUT_LINE:
 161                 cec_transmit_done(pulse8->adap, CEC_TX_STATUS_ERROR,
 162                                   0, 0, 0, 1);
 163                 break;
 164         }
 165 }
 166
 167 static irqreturn_t pulse8_interrupt(struct serio *serio, unsigned char data,
 168                                     unsigned int flags)
 169 {
 170         struct pulse8 *pulse8 = serio_get_drvdata(serio);
 171
 172         if (!pulse8->started && data != MSGSTART)
 173                 return IRQ_HANDLED;
 174         if (data == MSGESC) {
 175                 pulse8->escape = true;
 176                 return IRQ_HANDLED;
 177         }
 178         if (pulse8->escape) {
 179                 data += MSGOFFSET;
 180                 pulse8->escape = false;
 181         } else if (data == MSGEND) {
 182                 struct cec_msg *msg = &pulse8->rx_msg;
 183
 184                 if (debug)
 185                         dev_info(pulse8->dev, "received: %*ph\n",
 186                                  pulse8->idx, pulse8->buf);
 187                 pulse8->data[0] = pulse8->buf[0];
 188                 switch (pulse8->buf[0] & 0x3f) {
 189                 case MSGCODE_FRAME_START:
 190                         msg->len = 1;
 191                         msg->msg[0] = pulse8->buf[1];
 192                         break;
 193                 case MSGCODE_FRAME_DATA:
 194                         if (msg->len == CEC_MAX_MSG_SIZE)
 195                                 break;
 196                         msg->msg[msg->len++] = pulse8->buf[1];
 197                         if (pulse8->buf[0] & MSGCODE_FRAME_EOM)
 198                                 schedule_work(&pulse8->work);
 199                         break;
 200                 case MSGCODE_TRANSMIT_SUCCEEDED:
 201                 case MSGCODE_TRANSMIT_FAILED_LINE:
 202                 case MSGCODE_TRANSMIT_FAILED_ACK:
 203                 case MSGCODE_TRANSMIT_FAILED_TIMEOUT_DATA:
 204                 case MSGCODE_TRANSMIT_FAILED_TIMEOUT_LINE:
 205                         schedule_work(&pulse8->work);
 206                         break;
 207                 case MSGCODE_HIGH_ERROR:
 208                 case MSGCODE_LOW_ERROR:
 209                 case MSGCODE_RECEIVE_FAILED:
 210                 case MSGCODE_TIMEOUT_ERROR:
 211                         break;
 212                 case MSGCODE_COMMAND_ACCEPTED:
 213                 case MSGCODE_COMMAND_REJECTED:
 214                 default:
 215                         if (pulse8->idx == 0)
 216                                 break;
 217                         memcpy(pulse8->data, pulse8->buf, pulse8->idx);
 218                         pulse8->len = pulse8->idx;
 219                         complete(&pulse8->cmd_done);
 220                         break;
 221                 }
 222                 pulse8->idx = 0;
 223                 pulse8->started = false;
 224                 return IRQ_HANDLED;
 225         } else if (data == MSGSTART) {
 226                 pulse8->idx = 0;
 227                 pulse8->started = true;
 228                 return IRQ_HANDLED;
 229         }
 230
 231         if (pulse8->idx >= DATA_SIZE) {
 232                 dev_dbg(pulse8->dev,
 233                         "throwing away %d bytes of garbage\n", pulse8->idx);
 234                 pulse8->idx = 0;
 235         }
 236         pulse8->buf[pulse8->idx++] = data;
 237         return IRQ_HANDLED;
 238 }
 239
 240 static void pulse8_disconnect(struct serio *serio)
 241 {
 242         struct pulse8 *pulse8 = serio_get_drvdata(serio);
 243
 244         cec_unregister_adapter(pulse8->adap);
 245         cancel_delayed_work_sync(&pulse8->ping_eeprom_work);
 246         dev_info(&serio->dev, "disconnected\n");
 247         serio_close(serio);
 248         serio_set_drvdata(serio, NULL);
 249         kfree(pulse8);
 250 }
 251
 252 static int pulse8_send(struct serio *serio, const u8 *command, u8 cmd_len)
 253 {
 254         int err = 0;
 255
 256         err = serio_write(serio, MSGSTART);
 257         if (err)
 258                 return err;
 259         for (; !err && cmd_len; command++, cmd_len--) {
 260                 if (*command >= MSGESC) {
 261                         err = serio_write(serio, MSGESC);
 262                         if (!err)
 263                                 err = serio_write(serio, *command - MSGOFFSET);
 264                 } else {
 265                         err = serio_write(serio, *command);
 266                 }
 267         }
 268         if (!err)
 269                 err = serio_write(serio, MSGEND);
 270
 271         return err;
 272 }
 273
 274 static int pulse8_send_and_wait_once(struct pulse8 *pulse8,
 275                                      const u8 *cmd, u8 cmd_len,
 276                                      u8 response, u8 size)
 277 {
 278         int err;
 279
 280         /*dev_info(pulse8->dev, "transmit: %*ph\n", cmd_len, cmd);*/
 281         init_completion(&pulse8->cmd_done);
 282
 283         err = pulse8_send(pulse8->serio, cmd, cmd_len);
 284         if (err)
 285                 return err;
 286
 287         if (!wait_for_completion_timeout(&pulse8->cmd_done, HZ))
 288                 return -ETIMEDOUT;
 289         if ((pulse8->data[0] & 0x3f) == MSGCODE_COMMAND_REJECTED &&
 290             cmd[0] != MSGCODE_SET_CONTROLLED &&
 291             cmd[0] != MSGCODE_SET_AUTO_ENABLED &&
 292             cmd[0] != MSGCODE_GET_BUILDDATE)
 293                 return -ENOTTY;
 294         if (response &&
 295             ((pulse8->data[0] & 0x3f) != response || pulse8->len < size + 1)) {
 296                 dev_info(pulse8->dev, "transmit: failed %02x\n",
 297                          pulse8->data[0] & 0x3f);
 298                 return -EIO;
 299         }
 300         return 0;
 301 }
 302
 303 static int pulse8_send_and_wait(struct pulse8 *pulse8,
 304                                 const u8 *cmd, u8 cmd_len, u8 response, u8 size)
 305 {
 306         u8 cmd_sc[2];
 307         int err;
 308
 309         mutex_lock(&pulse8->write_lock);
 310         err = pulse8_send_and_wait_once(pulse8, cmd, cmd_len, response, size);
 311
 312         if (err == -ENOTTY) {
 313                 cmd_sc[0] = MSGCODE_SET_CONTROLLED;
 314                 cmd_sc[1] = 1;
 315                 err = pulse8_send_and_wait_once(pulse8, cmd_sc, 2,
 316                                                 MSGCODE_COMMAND_ACCEPTED, 1);
 317                 if (err)
 318                         goto unlock;
 319                 err = pulse8_send_and_wait_once(pulse8, cmd, cmd_len,
 320                                                 response, size);
 321         }
 322
 323 unlock:
 324         mutex_unlock(&pulse8->write_lock);
 325         return err == -ENOTTY ? -EIO : err;
 326 }
 327
 328 static int pulse8_setup(struct pulse8 *pulse8, struct serio *serio,
 329                         struct cec_log_addrs *log_addrs, u16 *pa)
 330 {
 331         u8 *data = pulse8->data + 1;
 332         u8 cmd[2];
 333         int err;
 334         struct tm tm;
 335         time_t date;
 336
 337         pulse8->vers = 0;
 338
 339         cmd[0] = MSGCODE_FIRMWARE_VERSION;
 340         err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 2);
 341         if (err)
 342                 return err;
 343         pulse8->vers = (data[0] << 8) | data[1];
 344         dev_info(pulse8->dev, "Firmware version %04x\n", pulse8->vers);
 345         if (pulse8->vers < 2) {
 346                 *pa = CEC_PHYS_ADDR_INVALID;
 347                 return 0;
 348         }
 349
 350         cmd[0] = MSGCODE_GET_BUILDDATE;
 351         err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 4);
 352         if (err)
 353                 return err;
 354         date = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
 355         time_to_tm(date, 0, &tm);
 356         dev_info(pulse8->dev, "Firmware build date %04ld.%02d.%02d %02d:%02d:%02d\n",
 357                  tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
 358                  tm.tm_hour, tm.tm_min, tm.tm_sec);
 359
 360         dev_dbg(pulse8->dev, "Persistent config:\n");
 361         cmd[0] = MSGCODE_GET_AUTO_ENABLED;
 362         err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 1);
 363         if (err)
 364                 return err;
 365         pulse8->autonomous = data[0];
 366         dev_dbg(pulse8->dev, "Autonomous mode: %s",
 367                 data[0] ? "on" : "off");
 368
 369         cmd[0] = MSGCODE_GET_DEVICE_TYPE;
 370         err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 1);
 371         if (err)
 372                 return err;
 373         log_addrs->primary_device_type[0] = data[0];
 374         dev_dbg(pulse8->dev, "Primary device type: %d\n", data[0]);
 375         switch (log_addrs->primary_device_type[0]) {
 376         case CEC_OP_PRIM_DEVTYPE_TV:
 377                 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_TV;
 378                 break;
 379         case CEC_OP_PRIM_DEVTYPE_RECORD:
 380                 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_RECORD;
 381                 break;
 382         case CEC_OP_PRIM_DEVTYPE_TUNER:
 383                 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_TUNER;
 384                 break;
 385         case CEC_OP_PRIM_DEVTYPE_PLAYBACK:
 386                 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_PLAYBACK;
 387                 break;
 388         case CEC_OP_PRIM_DEVTYPE_AUDIOSYSTEM:
 389                 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_PLAYBACK;
 390                 break;
 391         case CEC_OP_PRIM_DEVTYPE_SWITCH:
 392                 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_UNREGISTERED;
 393                 break;
 394         case CEC_OP_PRIM_DEVTYPE_PROCESSOR:
 395                 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_SPECIFIC;
 396                 break;
 397         default:
 398                 log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_UNREGISTERED;
 399                 dev_info(pulse8->dev, "Unknown Primary Device Type: %d\n",
 400                          log_addrs->primary_device_type[0]);
 401                 break;
 402         }
 403
 404         cmd[0] = MSGCODE_GET_LOGICAL_ADDRESS_MASK;
 405         err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 2);
 406         if (err)
 407                 return err;
 408         log_addrs->log_addr_mask = (data[0] << 8) | data[1];
 409         dev_dbg(pulse8->dev, "Logical address ACK mask: %x\n",
 410                 log_addrs->log_addr_mask);
 411         if (log_addrs->log_addr_mask)
 412                 log_addrs->num_log_addrs = 1;
 413
 414         cmd[0] = MSGCODE_GET_PHYSICAL_ADDRESS;
 415         err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 1);
 416         if (err)
 417                 return err;
 418         *pa = (data[0] << 8) | data[1];
 419         dev_dbg(pulse8->dev, "Physical address: %x.%x.%x.%x\n",
 420                 cec_phys_addr_exp(*pa));
 421
 422         cmd[0] = MSGCODE_GET_HDMI_VERSION;
 423         err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 1);
 424         if (err)
 425                 return err;
 426         log_addrs->cec_version = data[0];
 427         dev_dbg(pulse8->dev, "CEC version: %d\n", log_addrs->cec_version);
 428
 429         cmd[0] = MSGCODE_GET_OSD_NAME;
 430         err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 0);
 431         if (err)
 432                 return err;
 433         strncpy(log_addrs->osd_name, data, 13);
 434         dev_dbg(pulse8->dev, "OSD name: %s\n", log_addrs->osd_name);
 435
 436         return 0;
 437 }
 438
 439 static int pulse8_apply_persistent_config(struct pulse8 *pulse8,
 440                                           struct cec_log_addrs *log_addrs,
 441                                           u16 pa)
 442 {
 443         int err;
 444
 445         err = cec_s_log_addrs(pulse8->adap, log_addrs, false);
 446         if (err)
 447                 return err;
 448
 449         cec_s_phys_addr(pulse8->adap, pa, false);
 450
 451         return 0;
 452 }
 453
 454 static int pulse8_cec_adap_enable(struct cec_adapter *adap, bool enable)
 455 {
 456         struct pulse8 *pulse8 = adap->priv;
 457         u8 cmd[16];
 458         int err;
 459
 460         cmd[0] = MSGCODE_SET_CONTROLLED;
 461         cmd[1] = enable;
 462         err = pulse8_send_and_wait(pulse8, cmd, 2,
 463                                    MSGCODE_COMMAND_ACCEPTED, 1);
 464         return enable ? err : 0;
 465 }
 466
 467 static int pulse8_cec_adap_log_addr(struct cec_adapter *adap, u8 log_addr)
 468 {
 469         struct pulse8 *pulse8 = adap->priv;
 470         u16 mask = 0;
 471         u16 pa = adap->phys_addr;
 472         u8 cmd[16];
 473         int err = 0;
 474
 475         mutex_lock(&pulse8->config_lock);
 476         if (log_addr != CEC_LOG_ADDR_INVALID)
 477                 mask = 1 << log_addr;
 478         cmd[0] = MSGCODE_SET_ACK_MASK;
 479         cmd[1] = mask >> 8;
 480         cmd[2] = mask & 0xff;
 481         err = pulse8_send_and_wait(pulse8, cmd, 3,
 482                                    MSGCODE_COMMAND_ACCEPTED, 0);
 483         if ((err && mask != 0) || pulse8->restoring_config)
 484                 goto unlock;
 485
 486         cmd[0] = MSGCODE_SET_AUTO_ENABLED;
 487         cmd[1] = log_addr == CEC_LOG_ADDR_INVALID ? 0 : 1;
 488         err = pulse8_send_and_wait(pulse8, cmd, 2,
 489                                    MSGCODE_COMMAND_ACCEPTED, 0);
 490         if (err)
 491                 goto unlock;
 492         pulse8->autonomous = cmd[1];
 493         if (log_addr == CEC_LOG_ADDR_INVALID)
 494                 goto unlock;
 495
 496         cmd[0] = MSGCODE_SET_DEVICE_TYPE;
 497         cmd[1] = adap->log_addrs.primary_device_type[0];
 498         err = pulse8_send_and_wait(pulse8, cmd, 2,
 499                                    MSGCODE_COMMAND_ACCEPTED, 0);
 500         if (err)
 501                 goto unlock;
 502
 503         switch (adap->log_addrs.primary_device_type[0]) {
 504         case CEC_OP_PRIM_DEVTYPE_TV:
 505                 mask = CEC_LOG_ADDR_MASK_TV;
 506                 break;
 507         case CEC_OP_PRIM_DEVTYPE_RECORD:
 508                 mask = CEC_LOG_ADDR_MASK_RECORD;
 509                 break;
 510         case CEC_OP_PRIM_DEVTYPE_TUNER:
 511                 mask = CEC_LOG_ADDR_MASK_TUNER;
 512                 break;
 513         case CEC_OP_PRIM_DEVTYPE_PLAYBACK:
 514                 mask = CEC_LOG_ADDR_MASK_PLAYBACK;
 515                 break;
 516         case CEC_OP_PRIM_DEVTYPE_AUDIOSYSTEM:
 517                 mask = CEC_LOG_ADDR_MASK_AUDIOSYSTEM;
 518                 break;
 519         case CEC_OP_PRIM_DEVTYPE_SWITCH:
 520                 mask = CEC_LOG_ADDR_MASK_UNREGISTERED;
 521                 break;
 522         case CEC_OP_PRIM_DEVTYPE_PROCESSOR:
 523                 mask = CEC_LOG_ADDR_MASK_SPECIFIC;
 524                 break;
 525         default:
 526                 mask = 0;
 527                 break;
 528         }
 529         cmd[0] = MSGCODE_SET_LOGICAL_ADDRESS_MASK;
 530         cmd[1] = mask >> 8;
 531         cmd[2] = mask & 0xff;
 532         err = pulse8_send_and_wait(pulse8, cmd, 3,
 533                                    MSGCODE_COMMAND_ACCEPTED, 0);
 534         if (err)
 535                 goto unlock;
 536
 537         cmd[0] = MSGCODE_SET_DEFAULT_LOGICAL_ADDRESS;
 538         cmd[1] = log_addr;
 539         err = pulse8_send_and_wait(pulse8, cmd, 2,
 540                                    MSGCODE_COMMAND_ACCEPTED, 0);
 541         if (err)
 542                 goto unlock;
 543
 544         cmd[0] = MSGCODE_SET_PHYSICAL_ADDRESS;
 545         cmd[1] = pa >> 8;
 546         cmd[2] = pa & 0xff;
 547         err = pulse8_send_and_wait(pulse8, cmd, 3,
 548                                    MSGCODE_COMMAND_ACCEPTED, 0);
 549         if (err)
 550                 goto unlock;
 551
 552         cmd[0] = MSGCODE_SET_HDMI_VERSION;
 553         cmd[1] = adap->log_addrs.cec_version;
 554         err = pulse8_send_and_wait(pulse8, cmd, 2,
 555                                    MSGCODE_COMMAND_ACCEPTED, 0);
 556         if (err)
 557                 goto unlock;
 558
 559         if (adap->log_addrs.osd_name[0]) {
 560                 size_t osd_len = strlen(adap->log_addrs.osd_name);
 561                 char *osd_str = cmd + 1;
 562
 563                 cmd[0] = MSGCODE_SET_OSD_NAME;
 564                 strncpy(cmd + 1, adap->log_addrs.osd_name, 13);
 565                 if (osd_len < 4) {
 566                         memset(osd_str + osd_len, ' ', 4 - osd_len);
 567                         osd_len = 4;
 568                         osd_str[osd_len] = '\0';
 569                         strcpy(adap->log_addrs.osd_name, osd_str);
 570                 }
 571                 err = pulse8_send_and_wait(pulse8, cmd, 1 + osd_len,
 572                                            MSGCODE_COMMAND_ACCEPTED, 0);
 573                 if (err)
 574                         goto unlock;
 575         }
 576
 577 unlock:
 578         if (pulse8->restoring_config)
 579                 pulse8->restoring_config = false;
 580         else
 581                 pulse8->config_pending = true;
 582         mutex_unlock(&pulse8->config_lock);
 583         return err;
 584 }
 585
 586 static int pulse8_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
 587                                     u32 signal_free_time, struct cec_msg *msg)
 588 {
 589         struct pulse8 *pulse8 = adap->priv;
 590         u8 cmd[2];
 591         unsigned int i;
 592         int err;
 593
 594         cmd[0] = MSGCODE_TRANSMIT_IDLETIME;
 595         cmd[1] = signal_free_time;
 596         err = pulse8_send_and_wait(pulse8, cmd, 2,
 597                                    MSGCODE_COMMAND_ACCEPTED, 1);
 598         cmd[0] = MSGCODE_TRANSMIT_ACK_POLARITY;
 599         cmd[1] = cec_msg_is_broadcast(msg);
 600         if (!err)
 601                 err = pulse8_send_and_wait(pulse8, cmd, 2,
 602                                            MSGCODE_COMMAND_ACCEPTED, 1);
 603         cmd[0] = msg->len == 1 ? MSGCODE_TRANSMIT_EOM : MSGCODE_TRANSMIT;
 604         cmd[1] = msg->msg[0];
 605         if (!err)
 606                 err = pulse8_send_and_wait(pulse8, cmd, 2,
 607                                            MSGCODE_COMMAND_ACCEPTED, 1);
 608         if (!err && msg->len > 1) {
 609                 cmd[0] = msg->len == 2 ? MSGCODE_TRANSMIT_EOM :
 610                                          MSGCODE_TRANSMIT;
 611                 cmd[1] = msg->msg[1];
 612                 err = pulse8_send_and_wait(pulse8, cmd, 2,
 613                                            MSGCODE_COMMAND_ACCEPTED, 1);
 614                 for (i = 0; !err && i + 2 < msg->len; i++) {
 615                         cmd[0] = (i + 2 == msg->len - 1) ?
 616                                 MSGCODE_TRANSMIT_EOM : MSGCODE_TRANSMIT;
 617                         cmd[1] = msg->msg[i + 2];
 618                         err = pulse8_send_and_wait(pulse8, cmd, 2,
 619                                                    MSGCODE_COMMAND_ACCEPTED, 1);
 620                 }
 621         }
 622
 623         return err;
 624 }
 625
 626 static int pulse8_received(struct cec_adapter *adap, struct cec_msg *msg)
 627 {
 628         return -ENOMSG;
 629 }
 630
 631 static const struct cec_adap_ops pulse8_cec_adap_ops = {
 632         .adap_enable = pulse8_cec_adap_enable,
 633         .adap_log_addr = pulse8_cec_adap_log_addr,
 634         .adap_transmit = pulse8_cec_adap_transmit,
 635         .received = pulse8_received,
 636 };
 637
 638 static int pulse8_connect(struct serio *serio, struct serio_driver *drv)
 639 {
 640         u32 caps = CEC_CAP_TRANSMIT | CEC_CAP_LOG_ADDRS | CEC_CAP_PHYS_ADDR |
 641                 CEC_CAP_PASSTHROUGH | CEC_CAP_RC | CEC_CAP_MONITOR_ALL;
 642         struct pulse8 *pulse8;
 643         int err = -ENOMEM;
 644         struct cec_log_addrs log_addrs = {};
 645         u16 pa = CEC_PHYS_ADDR_INVALID;
 646
 647         pulse8 = kzalloc(sizeof(*pulse8), GFP_KERNEL);
 648
 649         if (!pulse8)
 650                 return -ENOMEM;
 651
 652         pulse8->serio = serio;
 653         pulse8->adap = cec_allocate_adapter(&pulse8_cec_adap_ops, pulse8,
 654                 "HDMI CEC", caps, 1, &serio->dev);
 655         err = PTR_ERR_OR_ZERO(pulse8->adap);
 656         if (err < 0)
 657                 goto free_device;
 658
 659         pulse8->dev = &serio->dev;
 660         serio_set_drvdata(serio, pulse8);
 661         INIT_WORK(&pulse8->work, pulse8_irq_work_handler);
 662         mutex_init(&pulse8->write_lock);
 663         mutex_init(&pulse8->config_lock);
 664         pulse8->config_pending = false;
 665
 666         err = serio_open(serio, drv);
 667         if (err)
 668                 goto delete_adap;
 669
 670         err = pulse8_setup(pulse8, serio, &log_addrs, &pa);
 671         if (err)
 672                 goto close_serio;
 673
 674         err = cec_register_adapter(pulse8->adap);
 675         if (err < 0)
 676                 goto close_serio;
 677
 678         pulse8->dev = &pulse8->adap->devnode.dev;
 679
 680         if (persistent_config && pulse8->autonomous) {
 681                 err = pulse8_apply_persistent_config(pulse8, &log_addrs, pa);
 682                 if (err)
 683                         goto close_serio;
 684                 pulse8->restoring_config = true;
 685         }
 686
 687         INIT_DELAYED_WORK(&pulse8->ping_eeprom_work,
 688                           pulse8_ping_eeprom_work_handler);
 689         schedule_delayed_work(&pulse8->ping_eeprom_work, PING_PERIOD);
 690
 691         return 0;
 692
 693 close_serio:
 694         serio_close(serio);
 695 delete_adap:
 696         cec_delete_adapter(pulse8->adap);
 697         serio_set_drvdata(serio, NULL);
 698 free_device:
 699         kfree(pulse8);
 700         return err;
 701 }
 702
 703 static void pulse8_ping_eeprom_work_handler(struct work_struct *work)
 704 {
 705         struct pulse8 *pulse8 =
 706                 container_of(work, struct pulse8, ping_eeprom_work.work);
 707         u8 cmd;
 708
 709         schedule_delayed_work(&pulse8->ping_eeprom_work, PING_PERIOD);
 710         cmd = MSGCODE_PING;
 711         pulse8_send_and_wait(pulse8, &cmd, 1,
 712                              MSGCODE_COMMAND_ACCEPTED, 0);
 713
 714         if (pulse8->vers < 2)
 715                 return;
 716
 717         mutex_lock(&pulse8->config_lock);
 718         if (pulse8->config_pending && persistent_config) {
 719                 dev_dbg(pulse8->dev, "writing pending config to EEPROM\n");
 720                 cmd = MSGCODE_WRITE_EEPROM;
 721                 if (pulse8_send_and_wait(pulse8, &cmd, 1,
 722                                          MSGCODE_COMMAND_ACCEPTED, 0))
 723                         dev_info(pulse8->dev, "failed to write pending config to EEPROM\n");
 724                 else
 725                         pulse8->config_pending = false;
 726         }
 727         mutex_unlock(&pulse8->config_lock);
 728 }
 729
 730 static struct serio_device_id pulse8_serio_ids[] = {
 731         {
 732                 .type   = SERIO_RS232,
 733                 .proto  = SERIO_PULSE8_CEC,
 734                 .id     = SERIO_ANY,
 735                 .extra  = SERIO_ANY,
 736         },
 737         { 0 }
 738 };
 739
 740 MODULE_DEVICE_TABLE(serio, pulse8_serio_ids);
 741
 742 static struct serio_driver pulse8_drv = {
 743         .driver         = {
 744                 .name   = "pulse8-cec",
 745         },
 746         .description    = "Pulse Eight HDMI CEC driver",
 747         .id_table       = pulse8_serio_ids,
 748         .interrupt      = pulse8_interrupt,
 749         .connect        = pulse8_connect,
 750         .disconnect     = pulse8_disconnect,
 751 };
 752
 753 module_serio_driver(pulse8_drv);