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 #include <linux/video_decoder.h>
  29
  30 #include "em28xx.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 static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
 295 {
 296         unsigned char buf, *p = eedata;
 297         struct em28xx_eeprom *em_eeprom = (void *)eedata;
 298         int i, err, size = len, block;
 299
 300         dev->i2c_client.addr = 0xa0 >> 1;
 301
 302         /* Check if board has eeprom */
 303         err = i2c_master_recv(&dev->i2c_client, &buf, 0);
 304         if (err < 0)
 305                 return -1;
 306
 307         buf = 0;
 308         if (1 != (err = i2c_master_send(&dev->i2c_client, &buf, 1))) {
 309                 printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
 310                        dev->name, err);
 311                 return -1;
 312         }
 313         while (size > 0) {
 314                 if (size > 16)
 315                         block = 16;
 316                 else
 317                         block = size;
 318
 319                 if (block !=
 320                     (err = i2c_master_recv(&dev->i2c_client, p, block))) {
 321                         printk(KERN_WARNING
 322                                "%s: i2c eeprom read error (err=%d)\n",
 323                                dev->name, err);
 324                         return -1;
 325                 }
 326                 size -= block;
 327                 p += block;
 328         }
 329         for (i = 0; i < len; i++) {
 330                 if (0 == (i % 16))
 331                         printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
 332                 printk(" %02x", eedata[i]);
 333                 if (15 == (i % 16))
 334                         printk("\n");
 335         }
 336
 337         printk(KERN_INFO "EEPROM ID= 0x%08x\n", em_eeprom->id);
 338         printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID,
 339                em_eeprom->product_ID);
 340
 341         switch (em_eeprom->chip_conf >> 4 & 0x3) {
 342         case 0:
 343                 printk(KERN_INFO "No audio on board.\n");
 344                 break;
 345         case 1:
 346                 printk(KERN_INFO "AC97 audio (5 sample rates)\n");
 347                 break;
 348         case 2:
 349                 printk(KERN_INFO "I2S audio, sample rate=32k\n");
 350                 break;
 351         case 3:
 352                 printk(KERN_INFO "I2S audio, 3 sample rates\n");
 353                 break;
 354         }
 355
 356         if (em_eeprom->chip_conf & 1 << 3)
 357                 printk(KERN_INFO "USB Remote wakeup capable\n");
 358
 359         if (em_eeprom->chip_conf & 1 << 2)
 360                 printk(KERN_INFO "USB Self power capable\n");
 361
 362         switch (em_eeprom->chip_conf & 0x3) {
 363         case 0:
 364                 printk(KERN_INFO "500mA max power\n");
 365                 break;
 366         case 1:
 367                 printk(KERN_INFO "400mA max power\n");
 368                 break;
 369         case 2:
 370                 printk(KERN_INFO "300mA max power\n");
 371                 break;
 372         case 3:
 373                 printk(KERN_INFO "200mA max power\n");
 374                 break;
 375         }
 376         printk(KERN_INFO "Table at 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
 377                                 em_eeprom->string_idx_table,em_eeprom->string1,
 378                                 em_eeprom->string2,em_eeprom->string3);
 379
 380         return 0;
 381 }
 382
 383 /* ----------------------------------------------------------- */
 384
 385 /*
 386  * functionality()
 387  */
 388 static u32 functionality(struct i2c_adapter *adap)
 389 {
 390         return I2C_FUNC_SMBUS_EMUL;
 391 }
 392
 393
 394 static int em28xx_set_tuner(int check_eeprom, struct i2c_client *client)
 395 {
 396         struct em28xx *dev = client->adapter->algo_data;
 397         struct tuner_setup tun_setup;
 398
 399         if (dev->has_tuner) {
 400                 tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
 401                 tun_setup.type = dev->tuner_type;
 402                 tun_setup.addr = dev->tuner_addr;
 403                 em28xx_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);
 404         }
 405
 406         return (0);
 407 }
 408
 409 /*
 410  * attach_inform()
 411  * gets called when a device attaches to the i2c bus
 412  * does some basic configuration
 413  */
 414 static int attach_inform(struct i2c_client *client)
 415 {
 416         struct em28xx *dev = client->adapter->algo_data;
 417
 418         switch (client->addr << 1) {
 419                 case 0x43:
 420                 case 0x4b:
 421                 {
 422                         struct tuner_setup tun_setup;
 423
 424                         tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
 425                         tun_setup.type = TUNER_TDA9887;
 426                         tun_setup.addr = client->addr;
 427
 428                         em28xx_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);
 429                         em28xx_i2c_call_clients(dev, TDA9887_SET_CONFIG, &dev->tda9887_conf);
 430                         break;
 431                 }
 432                 case 0x42:
 433                         dprintk1(1,"attach_inform: saa7114 detected.\n");
 434                         break;
 435                 case 0x4a:
 436                         dprintk1(1,"attach_inform: saa7113 detected.\n");
 437                         break;
 438                 case 0xa0:
 439                         dprintk1(1,"attach_inform: eeprom detected.\n");
 440                         break;
 441                 case 0x60:
 442                 case 0x8e:
 443                 {
 444                         struct IR_i2c *ir = i2c_get_clientdata(client);
 445                         dprintk1(1,"attach_inform: IR detected (%s).\n",ir->phys);
 446                         em28xx_set_ir(dev,ir);
 447                         break;
 448                 }
 449                 case 0x80:
 450                 case 0x88:
 451                         dprintk1(1,"attach_inform: msp34xx detected.\n");
 452                         break;
 453                 case 0xb8:
 454                 case 0xba:
 455                         dprintk1(1,"attach_inform: tvp5150 detected.\n");
 456                         break;
 457
 458                 default:
 459                         dprintk1(1,"attach inform: detected I2C address %x\n", client->addr << 1);
 460                         dev->tuner_addr = client->addr;
 461                         em28xx_set_tuner(-1, client);
 462         }
 463
 464         return 0;
 465 }
 466
 467 static struct i2c_algorithm em28xx_algo = {
 468         .master_xfer   = em28xx_i2c_xfer,
 469         .functionality = functionality,
 470 };
 471
 472 static struct i2c_adapter em28xx_adap_template = {
 473         .owner = THIS_MODULE,
 474         .class = I2C_CLASS_TV_ANALOG,
 475         .name = "em28xx",
 476         .id = I2C_HW_B_EM28XX,
 477         .algo = &em28xx_algo,
 478         .client_register = attach_inform,
 479 };
 480
 481 static struct i2c_client em28xx_client_template = {
 482         .name = "em28xx internal",
 483 };
 484
 485 /* ----------------------------------------------------------- */
 486
 487 /*
 488  * i2c_devs
 489  * incomplete list of known devices
 490  */
 491 static char *i2c_devs[128] = {
 492         [0x4a >> 1] = "saa7113h",
 493         [0x60 >> 1] = "remote IR sensor",
 494         [0x8e >> 1] = "remote IR sensor",
 495         [0x86 >> 1] = "tda9887",
 496         [0x80 >> 1] = "msp34xx",
 497         [0x88 >> 1] = "msp34xx",
 498         [0xa0 >> 1] = "eeprom",
 499         [0xb8 >> 1] = "tvp5150a",
 500         [0xba >> 1] = "tvp5150a",
 501         [0xc0 >> 1] = "tuner (analog)",
 502         [0xc2 >> 1] = "tuner (analog)",
 503         [0xc4 >> 1] = "tuner (analog)",
 504         [0xc6 >> 1] = "tuner (analog)",
 505 };
 506
 507 /*
 508  * do_i2c_scan()
 509  * check i2c address range for devices
 510  */
 511 static void do_i2c_scan(char *name, struct i2c_client *c)
 512 {
 513         unsigned char buf;
 514         int i, rc;
 515
 516         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 517                 c->addr = i;
 518                 rc = i2c_master_recv(c, &buf, 0);
 519                 if (rc < 0)
 520                         continue;
 521                 printk(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n", name,
 522                        i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 523         }
 524 }
 525
 526 /*
 527  * em28xx_i2c_call_clients()
 528  * send commands to all attached i2c devices
 529  */
 530 void em28xx_i2c_call_clients(struct em28xx *dev, unsigned int cmd, void *arg)
 531 {
 532         BUG_ON(NULL == dev->i2c_adap.algo_data);
 533         i2c_clients_command(&dev->i2c_adap, cmd, arg);
 534 }
 535
 536 /*
 537  * em28xx_i2c_register()
 538  * register i2c bus
 539  */
 540 int em28xx_i2c_register(struct em28xx *dev)
 541 {
 542         BUG_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg);
 543         BUG_ON(!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req);
 544         dev->i2c_adap = em28xx_adap_template;
 545         dev->i2c_adap.dev.parent = &dev->udev->dev;
 546         strcpy(dev->i2c_adap.name, dev->name);
 547         dev->i2c_adap.algo_data = dev;
 548         i2c_add_adapter(&dev->i2c_adap);
 549
 550         dev->i2c_client = em28xx_client_template;
 551         dev->i2c_client.adapter = &dev->i2c_adap;
 552
 553         em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
 554
 555         if (i2c_scan)
 556                 do_i2c_scan(dev->name, &dev->i2c_client);
 557         return 0;
 558 }
 559
 560 /*
 561  * em28xx_i2c_unregister()
 562  * unregister i2c_bus
 563  */
 564 int em28xx_i2c_unregister(struct em28xx *dev)
 565 {
 566         i2c_del_adapter(&dev->i2c_adap);
 567         return 0;
 568 }