drivers/media/video/em28xx/em28xx-i2c.c

   1 /*
   2    em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
   3
   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>
   8
   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.
  13
  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.
  18
  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., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/kernel.h>
  26 #include <linux/usb.h>
  27 #include <linux/i2c.h>
  28
  29 #include "em28xx.h"
  30 #include "tuner-xc2028.h"
  31 #include <media/v4l2-common.h>
  32 #include <media/tuner.h>
  33
  34 /* ----------------------------------------------------------- */
  35
  36 static unsigned int i2c_scan = 0;
  37 module_param(i2c_scan, int, 0444);
  38 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
  39
  40 static unsigned int i2c_debug = 0;
  41 module_param(i2c_debug, int, 0644);
  42 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
  43
  44 #define dprintk1(lvl,fmt, args...) if (i2c_debug>=lvl) do {\
  45                         printk(fmt, ##args); } while (0)
  46 #define dprintk2(lvl,fmt, args...) if (i2c_debug>=lvl) do{ \
  47                         printk(KERN_DEBUG "%s at %s: " fmt, \
  48                         dev->name, __FUNCTION__ , ##args); } while (0)
  49
  50 /*
  51  * em2800_i2c_send_max4()
  52  * send up to 4 bytes to the i2c device
  53  */
  54 static int em2800_i2c_send_max4(struct em28xx *dev, unsigned char addr,
  55                                 char *buf, int len)
  56 {
  57         int ret;
  58         int write_timeout;
  59         unsigned char b2[6];
  60         BUG_ON(len < 1 || len > 4);
  61         b2[5] = 0x80 + len - 1;
  62         b2[4] = addr;
  63         b2[3] = buf[0];
  64         if (len > 1)
  65                 b2[2] = buf[1];
  66         if (len > 2)
  67                 b2[1] = buf[2];
  68         if (len > 3)
  69                 b2[0] = buf[3];
  70
  71         ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
  72         if (ret != 2 + len) {
  73                 em28xx_warn("writing to i2c device failed (error=%i)\n", ret);
  74                 return -EIO;
  75         }
  76         for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
  77              write_timeout -= 5) {
  78                 ret = dev->em28xx_read_reg(dev, 0x05);
  79                 if (ret == 0x80 + len - 1)
  80                         return len;
  81                 msleep(5);
  82         }
  83         em28xx_warn("i2c write timed out\n");
  84         return -EIO;
  85 }
  86
  87 /*
  88  * em2800_i2c_send_bytes()
  89  */
  90 static int em2800_i2c_send_bytes(void *data, unsigned char addr, char *buf,
  91                                  short len)
  92 {
  93         char *bufPtr = buf;
  94         int ret;
  95         int wrcount = 0;
  96         int count;
  97         int maxLen = 4;
  98         struct em28xx *dev = (struct em28xx *)data;
  99         while (len > 0) {
 100                 count = (len > maxLen) ? maxLen : len;
 101                 ret = em2800_i2c_send_max4(dev, addr, bufPtr, count);
 102                 if (ret > 0) {
 103                         len -= count;
 104                         bufPtr += count;
 105                         wrcount += count;
 106                 } else
 107                         return (ret < 0) ? ret : -EFAULT;
 108         }
 109         return wrcount;
 110 }
 111
 112 /*
 113  * em2800_i2c_check_for_device()
 114  * check if there is a i2c_device at the supplied address
 115  */
 116 static int em2800_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
 117 {
 118         char msg;
 119         int ret;
 120         int write_timeout;
 121         msg = addr;
 122         ret = dev->em28xx_write_regs(dev, 0x04, &msg, 1);
 123         if (ret < 0) {
 124                 em28xx_warn("setting i2c device address failed (error=%i)\n",
 125                             ret);
 126                 return ret;
 127         }
 128         msg = 0x84;
 129         ret = dev->em28xx_write_regs(dev, 0x05, &msg, 1);
 130         if (ret < 0) {
 131                 em28xx_warn("preparing i2c read failed (error=%i)\n", ret);
 132                 return ret;
 133         }
 134         for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
 135              write_timeout -= 5) {
 136                 unsigned msg = dev->em28xx_read_reg(dev, 0x5);
 137                 if (msg == 0x94)
 138                         return -ENODEV;
 139                 else if (msg == 0x84)
 140                         return 0;
 141                 msleep(5);
 142         }
 143         return -ENODEV;
 144 }
 145
 146 /*
 147  * em2800_i2c_recv_bytes()
 148  * read from the i2c device
 149  */
 150 static int em2800_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
 151                                  char *buf, int len)
 152 {
 153         int ret;
 154         /* check for the device and set i2c read address */
 155         ret = em2800_i2c_check_for_device(dev, addr);
 156         if (ret) {
 157                 em28xx_warn
 158                     ("preparing read at i2c address 0x%x failed (error=%i)\n",
 159                      addr, ret);
 160                 return ret;
 161         }
 162         ret = dev->em28xx_read_reg_req_len(dev, 0x0, 0x3, buf, len);
 163         if (ret < 0) {
 164                 em28xx_warn("reading from i2c device at 0x%x failed (error=%i)",
 165                             addr, ret);
 166                 return ret;
 167         }
 168         return ret;
 169 }
 170
 171 /*
 172  * em28xx_i2c_send_bytes()
 173  * untested for more than 4 bytes
 174  */
 175 static int em28xx_i2c_send_bytes(void *data, unsigned char addr, char *buf,
 176                                  short len, int stop)
 177 {
 178         int wrcount = 0;
 179         struct em28xx *dev = (struct em28xx *)data;
 180
 181         wrcount = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
 182
 183         return wrcount;
 184 }
 185
 186 /*
 187  * em28xx_i2c_recv_bytes()
 188  * read a byte from the i2c device
 189  */
 190 static int em28xx_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
 191                                  char *buf, int len)
 192 {
 193         int ret;
 194         ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
 195         if (ret < 0) {
 196                 em28xx_warn("reading i2c device failed (error=%i)\n", ret);
 197                 return ret;
 198         }
 199         if (dev->em28xx_read_reg(dev, 0x5) != 0)
 200                 return -ENODEV;
 201         return ret;
 202 }
 203
 204 /*
 205  * em28xx_i2c_check_for_device()
 206  * check if there is a i2c_device at the supplied address
 207  */
 208 static int em28xx_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
 209 {
 210         char msg;
 211         int ret;
 212         msg = addr;
 213
 214         ret = dev->em28xx_read_reg_req(dev, 2, addr);
 215         if (ret < 0) {
 216                 em28xx_warn("reading from i2c device failed (error=%i)\n", ret);
 217                 return ret;
 218         }
 219         if (dev->em28xx_read_reg(dev, 0x5) != 0)
 220                 return -ENODEV;
 221         return 0;
 222 }
 223
 224 /*
 225  * em28xx_i2c_xfer()
 226  * the main i2c transfer function
 227  */
 228 static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
 229                            struct i2c_msg msgs[], int num)
 230 {
 231         struct em28xx *dev = i2c_adap->algo_data;
 232         int addr, rc, i, byte;
 233
 234         if (num <= 0)
 235                 return 0;
 236         for (i = 0; i < num; i++) {
 237                 addr = msgs[i].addr << 1;
 238                 dprintk2(2,"%s %s addr=%x len=%d:",
 239                          (msgs[i].flags & I2C_M_RD) ? "read" : "write",
 240                          i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
 241                 if (!msgs[i].len) {     /* no len: check only for device presence */
 242                         if (dev->is_em2800)
 243                                 rc = em2800_i2c_check_for_device(dev, addr);
 244                         else
 245                                 rc = em28xx_i2c_check_for_device(dev, addr);
 246                         if (rc < 0) {
 247                                 dprintk2(2," no device\n");
 248                                 return rc;
 249                         }
 250
 251                 } else if (msgs[i].flags & I2C_M_RD) {
 252                         /* read bytes */
 253                         if (dev->is_em2800)
 254                                 rc = em2800_i2c_recv_bytes(dev, addr,
 255                                                            msgs[i].buf,
 256                                                            msgs[i].len);
 257                         else
 258                                 rc = em28xx_i2c_recv_bytes(dev, addr,
 259                                                            msgs[i].buf,
 260                                                            msgs[i].len);
 261                         if (i2c_debug>=2) {
 262                                 for (byte = 0; byte < msgs[i].len; byte++) {
 263                                         printk(" %02x", msgs[i].buf[byte]);
 264                                 }
 265                         }
 266                 } else {
 267                         /* write bytes */
 268                         if (i2c_debug>=2) {
 269                                 for (byte = 0; byte < msgs[i].len; byte++)
 270                                         printk(" %02x", msgs[i].buf[byte]);
 271                         }
 272                         if (dev->is_em2800)
 273                                 rc = em2800_i2c_send_bytes(dev, addr,
 274                                                            msgs[i].buf,
 275                                                            msgs[i].len);
 276                         else
 277                                 rc = em28xx_i2c_send_bytes(dev, addr,
 278                                                            msgs[i].buf,
 279                                                            msgs[i].len,
 280                                                            i == num - 1);
 281                 }
 282                 if (rc < 0)
 283                         goto err;
 284                 if (i2c_debug>=2)
 285                         printk("\n");
 286         }
 287
 288         return num;
 289       err:
 290         dprintk2(2," ERROR: %i\n", rc);
 291         return rc;
 292 }
 293
 294 /* based on linux/sunrpc/svcauth.h and linux/hash.h
 295  * The original hash function returns a different value, if arch is x86_64
 296  *  or i386.
 297  */
 298 static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
 299 {
 300         unsigned long hash = 0;
 301         unsigned long l = 0;
 302         int len = 0;
 303         unsigned char c;
 304         do {
 305                 if (len == length) {
 306                         c = (char)len;
 307                         len = -1;
 308                 } else
 309                         c = *buf++;
 310                 l = (l << 8) | c;
 311                 len++;
 312                 if ((len & (32 / 8 - 1)) == 0)
 313                         hash = ((hash^l) * 0x9e370001UL);
 314         } while (len);
 315
 316         return (hash >> (32 - bits)) & 0xffffffffUL;
 317 }
 318
 319 static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
 320 {
 321         unsigned char buf, *p = eedata;
 322         struct em28xx_eeprom *em_eeprom = (void *)eedata;
 323         int i, err, size = len, block;
 324
 325         dev->i2c_client.addr = 0xa0 >> 1;
 326
 327         /* Check if board has eeprom */
 328         err = i2c_master_recv(&dev->i2c_client, &buf, 0);
 329         if (err < 0)
 330                 return -1;
 331
 332         buf = 0;
 333         if (1 != (err = i2c_master_send(&dev->i2c_client, &buf, 1))) {
 334                 printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
 335                        dev->name, err);
 336                 return -1;
 337         }
 338         while (size > 0) {
 339                 if (size > 16)
 340                         block = 16;
 341                 else
 342                         block = size;
 343
 344                 if (block !=
 345                     (err = i2c_master_recv(&dev->i2c_client, p, block))) {
 346                         printk(KERN_WARNING
 347                                "%s: i2c eeprom read error (err=%d)\n",
 348                                dev->name, err);
 349                         return -1;
 350                 }
 351                 size -= block;
 352                 p += block;
 353         }
 354         for (i = 0; i < len; i++) {
 355                 if (0 == (i % 16))
 356                         printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
 357                 printk(" %02x", eedata[i]);
 358                 if (15 == (i % 16))
 359                         printk("\n");
 360         }
 361
 362         if (em_eeprom->id == 0x9567eb1a)
 363                 dev->hash = em28xx_hash_mem(eedata, len, 32);
 364
 365         printk(KERN_INFO "EEPROM ID= 0x%08x, hash = 0x%08lx\n",
 366                em_eeprom->id, dev->hash);
 367         printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID,
 368                em_eeprom->product_ID);
 369
 370         switch (em_eeprom->chip_conf >> 4 & 0x3) {
 371         case 0:
 372                 printk(KERN_INFO "No audio on board.\n");
 373                 break;
 374         case 1:
 375                 printk(KERN_INFO "AC97 audio (5 sample rates)\n");
 376                 break;
 377         case 2:
 378                 printk(KERN_INFO "I2S audio, sample rate=32k\n");
 379                 break;
 380         case 3:
 381                 printk(KERN_INFO "I2S audio, 3 sample rates\n");
 382                 break;
 383         }
 384
 385         if (em_eeprom->chip_conf & 1 << 3)
 386                 printk(KERN_INFO "USB Remote wakeup capable\n");
 387
 388         if (em_eeprom->chip_conf & 1 << 2)
 389                 printk(KERN_INFO "USB Self power capable\n");
 390
 391         switch (em_eeprom->chip_conf & 0x3) {
 392         case 0:
 393                 printk(KERN_INFO "500mA max power\n");
 394                 break;
 395         case 1:
 396                 printk(KERN_INFO "400mA max power\n");
 397                 break;
 398         case 2:
 399                 printk(KERN_INFO "300mA max power\n");
 400                 break;
 401         case 3:
 402                 printk(KERN_INFO "200mA max power\n");
 403                 break;
 404         }
 405         printk(KERN_INFO "Table at 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
 406                                 em_eeprom->string_idx_table,em_eeprom->string1,
 407                                 em_eeprom->string2,em_eeprom->string3);
 408
 409         return 0;
 410 }
 411
 412 /* ----------------------------------------------------------- */
 413
 414 /*
 415  * functionality()
 416  */
 417 static u32 functionality(struct i2c_adapter *adap)
 418 {
 419         return I2C_FUNC_SMBUS_EMUL;
 420 }
 421
 422
 423 /*
 424  * attach_inform()
 425  * gets called when a device attaches to the i2c bus
 426  * does some basic configuration
 427  */
 428 static int attach_inform(struct i2c_client *client)
 429 {
 430         struct em28xx *dev = client->adapter->algo_data;
 431
 432         switch (client->addr << 1) {
 433                 case 0x86:
 434                 case 0x84:
 435                 case 0x96:
 436                 case 0x94:
 437                 {
 438                         struct v4l2_priv_tun_config tda9887_cfg;
 439
 440                         struct tuner_setup tun_setup;
 441
 442                         tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
 443                         tun_setup.type = TUNER_TDA9887;
 444                         tun_setup.addr = client->addr;
 445
 446                         em28xx_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);
 447
 448                         tda9887_cfg.tuner = TUNER_TDA9887;
 449                         tda9887_cfg.priv = &dev->tda9887_conf;
 450                         em28xx_i2c_call_clients(dev, TUNER_SET_CONFIG,
 451                                                 &tda9887_cfg);
 452                         break;
 453                 }
 454                 case 0x42:
 455                         dprintk1(1,"attach_inform: saa7114 detected.\n");
 456                         break;
 457                 case 0x4a:
 458                         dprintk1(1,"attach_inform: saa7113 detected.\n");
 459                         break;
 460                 case 0xa0:
 461                         dprintk1(1,"attach_inform: eeprom detected.\n");
 462                         break;
 463                 case 0x60:
 464                 case 0x8e:
 465                 {
 466                         struct IR_i2c *ir = i2c_get_clientdata(client);
 467                         dprintk1(1,"attach_inform: IR detected (%s).\n",ir->phys);
 468                         em28xx_set_ir(dev,ir);
 469                         break;
 470                 }
 471                 case 0x80:
 472                 case 0x88:
 473                         dprintk1(1,"attach_inform: msp34xx detected.\n");
 474                         break;
 475                 case 0xb8:
 476                 case 0xba:
 477                         dprintk1(1,"attach_inform: tvp5150 detected.\n");
 478                         break;
 479
 480                 default:
 481                         if (!dev->tuner_addr)
 482                                 dev->tuner_addr = client->addr;
 483
 484                         dprintk1(1,"attach inform: detected I2C address %x\n", client->addr << 1);
 485
 486         }
 487
 488         return 0;
 489 }
 490
 491 static struct i2c_algorithm em28xx_algo = {
 492         .master_xfer   = em28xx_i2c_xfer,
 493         .functionality = functionality,
 494 };
 495
 496 static struct i2c_adapter em28xx_adap_template = {
 497         .owner = THIS_MODULE,
 498         .class = I2C_CLASS_TV_ANALOG,
 499         .name = "em28xx",
 500         .id = I2C_HW_B_EM28XX,
 501         .algo = &em28xx_algo,
 502         .client_register = attach_inform,
 503 };
 504
 505 static struct i2c_client em28xx_client_template = {
 506         .name = "em28xx internal",
 507 };
 508
 509 /* ----------------------------------------------------------- */
 510
 511 /*
 512  * i2c_devs
 513  * incomplete list of known devices
 514  */
 515 static char *i2c_devs[128] = {
 516         [0x4a >> 1] = "saa7113h",
 517         [0x60 >> 1] = "remote IR sensor",
 518         [0x8e >> 1] = "remote IR sensor",
 519         [0x86 >> 1] = "tda9887",
 520         [0x80 >> 1] = "msp34xx",
 521         [0x88 >> 1] = "msp34xx",
 522         [0xa0 >> 1] = "eeprom",
 523         [0xb8 >> 1] = "tvp5150a",
 524         [0xba >> 1] = "tvp5150a",
 525         [0xc0 >> 1] = "tuner (analog)",
 526         [0xc2 >> 1] = "tuner (analog)",
 527         [0xc4 >> 1] = "tuner (analog)",
 528         [0xc6 >> 1] = "tuner (analog)",
 529 };
 530
 531 /*
 532  * do_i2c_scan()
 533  * check i2c address range for devices
 534  */
 535 void em28xx_do_i2c_scan(struct em28xx *dev)
 536 {
 537         u8 i2c_devicelist[128];
 538         unsigned char buf;
 539         int i, rc;
 540
 541         memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
 542
 543         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 544                 dev->i2c_client.addr = i;
 545                 rc = i2c_master_recv(&dev->i2c_client, &buf, 0);
 546                 if (rc < 0)
 547                         continue;
 548                 i2c_devicelist[i] = i;
 549                 printk(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n",
 550                        dev->name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 551         }
 552
 553         dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
 554                                         ARRAY_SIZE(i2c_devicelist), 32);
 555 }
 556
 557 /*
 558  * em28xx_i2c_call_clients()
 559  * send commands to all attached i2c devices
 560  */
 561 void em28xx_i2c_call_clients(struct em28xx *dev, unsigned int cmd, void *arg)
 562 {
 563         BUG_ON(NULL == dev->i2c_adap.algo_data);
 564         i2c_clients_command(&dev->i2c_adap, cmd, arg);
 565 }
 566
 567 /*
 568  * em28xx_i2c_register()
 569  * register i2c bus
 570  */
 571 int em28xx_i2c_register(struct em28xx *dev)
 572 {
 573         BUG_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg);
 574         BUG_ON(!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req);
 575         dev->i2c_adap = em28xx_adap_template;
 576         dev->i2c_adap.dev.parent = &dev->udev->dev;
 577         strcpy(dev->i2c_adap.name, dev->name);
 578         dev->i2c_adap.algo_data = dev;
 579         i2c_add_adapter(&dev->i2c_adap);
 580
 581         dev->i2c_client = em28xx_client_template;
 582         dev->i2c_client.adapter = &dev->i2c_adap;
 583
 584         em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
 585
 586         if (i2c_scan)
 587                 em28xx_do_i2c_scan(dev);
 588         return 0;
 589 }
 590
 591 /*
 592  * em28xx_i2c_unregister()
 593  * unregister i2c_bus
 594  */
 595 int em28xx_i2c_unregister(struct em28xx *dev)
 596 {
 597         i2c_del_adapter(&dev->i2c_adap);
 598         return 0;
 599 }