drivers/media/video/bt8xx/bttv-i2c.c

   1 /*
   2
   3     bttv-i2c.c  --  all the i2c code is here
   4
   5     bttv - Bt848 frame grabber driver
   6
   7     Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
   8                            & Marcus Metzler (mocm@thp.uni-koeln.de)
   9     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
  10
  11     (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
  12         - Multituner support and i2c address binding
  13
  14     This program is free software; you can redistribute it and/or modify
  15     it under the terms of the GNU General Public License as published by
  16     the Free Software Foundation; either version 2 of the License, or
  17     (at your option) any later version.
  18
  19     This program is distributed in the hope that it will be useful,
  20     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22     GNU General Public License for more details.
  23
  24     You should have received a copy of the GNU General Public License
  25     along with this program; if not, write to the Free Software
  26     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27
  28 */
  29
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/delay.h>
  33
  34 #include "bttvp.h"
  35 #include <media/v4l2-common.h>
  36 #include <linux/jiffies.h>
  37 #include <asm/io.h>
  38
  39 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template;
  40 static struct i2c_adapter bttv_i2c_adap_sw_template;
  41 static struct i2c_adapter bttv_i2c_adap_hw_template;
  42 static struct i2c_client bttv_i2c_client_template;
  43
  44 static int attach_inform(struct i2c_client *client);
  45
  46 static int i2c_debug;
  47 static int i2c_hw;
  48 static int i2c_scan;
  49 module_param(i2c_debug, int, 0644);
  50 MODULE_PARM_DESC(i2c_hw,"configure i2c debug level");
  51 module_param(i2c_hw,    int, 0444);
  52 MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
  53                         "instead of software bitbang");
  54 module_param(i2c_scan,  int, 0444);
  55 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
  56
  57 static unsigned int i2c_udelay = 5;
  58 module_param(i2c_udelay, int, 0444);
  59 MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
  60                 "(should be 5 or higher). Lower value means higher bus speed.");
  61
  62 /* ----------------------------------------------------------------------- */
  63 /* I2C functions - bitbanging adapter (software i2c)                       */
  64
  65 static void bttv_bit_setscl(void *data, int state)
  66 {
  67         struct bttv *btv = (struct bttv*)data;
  68
  69         if (state)
  70                 btv->i2c_state |= 0x02;
  71         else
  72                 btv->i2c_state &= ~0x02;
  73         btwrite(btv->i2c_state, BT848_I2C);
  74         btread(BT848_I2C);
  75 }
  76
  77 static void bttv_bit_setsda(void *data, int state)
  78 {
  79         struct bttv *btv = (struct bttv*)data;
  80
  81         if (state)
  82                 btv->i2c_state |= 0x01;
  83         else
  84                 btv->i2c_state &= ~0x01;
  85         btwrite(btv->i2c_state, BT848_I2C);
  86         btread(BT848_I2C);
  87 }
  88
  89 static int bttv_bit_getscl(void *data)
  90 {
  91         struct bttv *btv = (struct bttv*)data;
  92         int state;
  93
  94         state = btread(BT848_I2C) & 0x02 ? 1 : 0;
  95         return state;
  96 }
  97
  98 static int bttv_bit_getsda(void *data)
  99 {
 100         struct bttv *btv = (struct bttv*)data;
 101         int state;
 102
 103         state = btread(BT848_I2C) & 0x01;
 104         return state;
 105 }
 106
 107 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = {
 108         .setsda  = bttv_bit_setsda,
 109         .setscl  = bttv_bit_setscl,
 110         .getsda  = bttv_bit_getsda,
 111         .getscl  = bttv_bit_getscl,
 112         .udelay  = 16,
 113         .timeout = 200,
 114 };
 115
 116 static struct i2c_adapter bttv_i2c_adap_sw_template = {
 117         .owner             = THIS_MODULE,
 118         .class             = I2C_CLASS_TV_ANALOG,
 119         .name              = "bttv",
 120         .id                = I2C_HW_B_BT848,
 121         .client_register   = attach_inform,
 122 };
 123
 124 /* ----------------------------------------------------------------------- */
 125 /* I2C functions - hardware i2c                                            */
 126
 127 static u32 functionality(struct i2c_adapter *adap)
 128 {
 129         return I2C_FUNC_SMBUS_EMUL;
 130 }
 131
 132 static int
 133 bttv_i2c_wait_done(struct bttv *btv)
 134 {
 135         int rc = 0;
 136
 137         /* timeout */
 138         if (wait_event_interruptible_timeout(btv->i2c_queue,
 139                 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
 140
 141         rc = -EIO;
 142
 143         if (btv->i2c_done & BT848_INT_RACK)
 144                 rc = 1;
 145         btv->i2c_done = 0;
 146         return rc;
 147 }
 148
 149 #define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
 150                 BT848_I2C_SCL | BT848_I2C_SDA)
 151
 152 static int
 153 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 154 {
 155         u32 xmit;
 156         int retval,cnt;
 157
 158         /* sanity checks */
 159         if (0 == msg->len)
 160                 return -EINVAL;
 161
 162         /* start, address + first byte */
 163         xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
 164         if (msg->len > 1 || !last)
 165                 xmit |= BT878_I2C_NOSTOP;
 166         btwrite(xmit, BT848_I2C);
 167         retval = bttv_i2c_wait_done(btv);
 168         if (retval < 0)
 169                 goto err;
 170         if (retval == 0)
 171                 goto eio;
 172         if (i2c_debug) {
 173                 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
 174                 if (!(xmit & BT878_I2C_NOSTOP))
 175                         printk(" >\n");
 176         }
 177
 178         for (cnt = 1; cnt < msg->len; cnt++ ) {
 179                 /* following bytes */
 180                 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
 181                 if (cnt < msg->len-1 || !last)
 182                         xmit |= BT878_I2C_NOSTOP;
 183                 btwrite(xmit, BT848_I2C);
 184                 retval = bttv_i2c_wait_done(btv);
 185                 if (retval < 0)
 186                         goto err;
 187                 if (retval == 0)
 188                         goto eio;
 189                 if (i2c_debug) {
 190                         printk(" %02x", msg->buf[cnt]);
 191                         if (!(xmit & BT878_I2C_NOSTOP))
 192                                 printk(" >\n");
 193                 }
 194         }
 195         return msg->len;
 196
 197  eio:
 198         retval = -EIO;
 199  err:
 200         if (i2c_debug)
 201                 printk(" ERR: %d\n",retval);
 202         return retval;
 203 }
 204
 205 static int
 206 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 207 {
 208         u32 xmit;
 209         u32 cnt;
 210         int retval;
 211
 212         for(cnt = 0; cnt < msg->len; cnt++) {
 213                 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
 214                 if (cnt < msg->len-1)
 215                         xmit |= BT848_I2C_W3B;
 216                 if (cnt < msg->len-1 || !last)
 217                         xmit |= BT878_I2C_NOSTOP;
 218                 if (cnt)
 219                         xmit |= BT878_I2C_NOSTART;
 220                 btwrite(xmit, BT848_I2C);
 221                 retval = bttv_i2c_wait_done(btv);
 222                 if (retval < 0)
 223                         goto err;
 224                 if (retval == 0)
 225                         goto eio;
 226                 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
 227                 if (i2c_debug) {
 228                         if (!(xmit & BT878_I2C_NOSTART))
 229                                 printk(" <R %02x", (msg->addr << 1) +1);
 230                         printk(" =%02x", msg->buf[cnt]);
 231                         if (!(xmit & BT878_I2C_NOSTOP))
 232                                 printk(" >\n");
 233                 }
 234         }
 235         return msg->len;
 236
 237  eio:
 238         retval = -EIO;
 239  err:
 240         if (i2c_debug)
 241                 printk(" ERR: %d\n",retval);
 242         return retval;
 243 }
 244
 245 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
 246 {
 247         struct bttv *btv = i2c_get_adapdata(i2c_adap);
 248         int retval = 0;
 249         int i;
 250
 251         if (i2c_debug)
 252                 printk("bt-i2c:");
 253         btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
 254         for (i = 0 ; i < num; i++) {
 255                 if (msgs[i].flags & I2C_M_RD) {
 256                         /* read */
 257                         retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
 258                         if (retval < 0)
 259                                 goto err;
 260                 } else {
 261                         /* write */
 262                         retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
 263                         if (retval < 0)
 264                                 goto err;
 265                 }
 266         }
 267         return num;
 268
 269  err:
 270         return retval;
 271 }
 272
 273 static struct i2c_algorithm bttv_algo = {
 274         .master_xfer   = bttv_i2c_xfer,
 275         .functionality = functionality,
 276 };
 277
 278 static struct i2c_adapter bttv_i2c_adap_hw_template = {
 279         .owner             = THIS_MODULE,
 280         .class         = I2C_CLASS_TV_ANALOG,
 281         .name          = "bt878",
 282         .id            = I2C_HW_B_BT848 /* FIXME */,
 283         .algo          = &bttv_algo,
 284         .client_register = attach_inform,
 285 };
 286
 287 /* ----------------------------------------------------------------------- */
 288 /* I2C functions - common stuff                                            */
 289
 290 static int attach_inform(struct i2c_client *client)
 291 {
 292         struct bttv *btv = i2c_get_adapdata(client->adapter);
 293         int addr=ADDR_UNSET;
 294
 295
 296         if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr)
 297                 addr = bttv_tvcards[btv->c.type].tuner_addr;
 298
 299
 300         if (bttv_debug)
 301                 printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n",
 302                         btv->c.nr, client->driver->driver.name, client->addr,
 303                         client->name);
 304         if (!client->driver->command)
 305                 return 0;
 306
 307         if (client->driver->id == I2C_DRIVERID_MSP3400)
 308                 btv->i2c_msp34xx_client = client;
 309         if (client->driver->id == I2C_DRIVERID_TVAUDIO)
 310                 btv->i2c_tvaudio_client = client;
 311         if (btv->tuner_type != UNSET) {
 312                 struct tuner_setup tun_setup;
 313
 314                 if ((addr==ADDR_UNSET) ||
 315                                 (addr==client->addr)) {
 316
 317                         tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO;
 318                         tun_setup.type = btv->tuner_type;
 319                         tun_setup.addr = addr;
 320                         bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup);
 321                 }
 322
 323         }
 324
 325         return 0;
 326 }
 327
 328 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
 329 {
 330         if (0 != btv->i2c_rc)
 331                 return;
 332         i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
 333 }
 334
 335 static struct i2c_client bttv_i2c_client_template = {
 336         .name   = "bttv internal",
 337 };
 338
 339
 340 /* read I2C */
 341 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
 342 {
 343         unsigned char buffer = 0;
 344
 345         if (0 != btv->i2c_rc)
 346                 return -1;
 347         if (bttv_verbose && NULL != probe_for)
 348                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
 349                        btv->c.nr,probe_for,addr);
 350         btv->i2c_client.addr = addr >> 1;
 351         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
 352                 if (NULL != probe_for) {
 353                         if (bttv_verbose)
 354                                 printk("not found\n");
 355                 } else
 356                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
 357                                btv->c.nr,addr);
 358                 return -1;
 359         }
 360         if (bttv_verbose && NULL != probe_for)
 361                 printk("found\n");
 362         return buffer;
 363 }
 364
 365 /* write I2C */
 366 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
 367                     unsigned char b2, int both)
 368 {
 369         unsigned char buffer[2];
 370         int bytes = both ? 2 : 1;
 371
 372         if (0 != btv->i2c_rc)
 373                 return -1;
 374         btv->i2c_client.addr = addr >> 1;
 375         buffer[0] = b1;
 376         buffer[1] = b2;
 377         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
 378                 return -1;
 379         return 0;
 380 }
 381
 382 /* read EEPROM content */
 383 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
 384 {
 385         memset(eedata, 0, 256);
 386         if (0 != btv->i2c_rc)
 387                 return;
 388         btv->i2c_client.addr = addr >> 1;
 389         tveeprom_read(&btv->i2c_client, eedata, 256);
 390 }
 391
 392 static char *i2c_devs[128] = {
 393         [ 0x1c >> 1 ] = "lgdt330x",
 394         [ 0x30 >> 1 ] = "IR (hauppauge)",
 395         [ 0x80 >> 1 ] = "msp34xx",
 396         [ 0x86 >> 1 ] = "tda9887",
 397         [ 0xa0 >> 1 ] = "eeprom",
 398         [ 0xc0 >> 1 ] = "tuner (analog)",
 399         [ 0xc2 >> 1 ] = "tuner (analog)",
 400 };
 401
 402 static void do_i2c_scan(char *name, struct i2c_client *c)
 403 {
 404         unsigned char buf;
 405         int i,rc;
 406
 407         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 408                 c->addr = i;
 409                 rc = i2c_master_recv(c,&buf,0);
 410                 if (rc < 0)
 411                         continue;
 412                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 413                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 414         }
 415 }
 416
 417 /* init + register i2c algo-bit adapter */
 418 int __devinit init_bttv_i2c(struct bttv *btv)
 419 {
 420         memcpy(&btv->i2c_client, &bttv_i2c_client_template,
 421                sizeof(bttv_i2c_client_template));
 422
 423         if (i2c_hw)
 424                 btv->use_i2c_hw = 1;
 425         if (btv->use_i2c_hw) {
 426                 /* bt878 */
 427                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
 428                        sizeof(bttv_i2c_adap_hw_template));
 429         } else {
 430                 /* bt848 */
 431         /* Prevents usage of invalid delay values */
 432                 if (i2c_udelay<5)
 433                         i2c_udelay=5;
 434                 bttv_i2c_algo_bit_template.udelay=i2c_udelay;
 435
 436                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
 437                        sizeof(bttv_i2c_adap_sw_template));
 438                 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
 439                        sizeof(bttv_i2c_algo_bit_template));
 440                 btv->i2c_algo.data = btv;
 441                 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
 442         }
 443
 444         btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
 445         snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
 446                  "bt%d #%d [%s]", btv->id, btv->c.nr,
 447                  btv->use_i2c_hw ? "hw" : "sw");
 448
 449         i2c_set_adapdata(&btv->c.i2c_adap, btv);
 450         btv->i2c_client.adapter = &btv->c.i2c_adap;
 451
 452         if (bttv_tvcards[btv->c.type].no_video)
 453                 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
 454         if (bttv_tvcards[btv->c.type].has_dvb)
 455                 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
 456
 457         if (btv->use_i2c_hw) {
 458                 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
 459         } else {
 460                 bttv_bit_setscl(btv,1);
 461                 bttv_bit_setsda(btv,1);
 462                 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
 463         }
 464         if (0 == btv->i2c_rc && i2c_scan)
 465                 do_i2c_scan(btv->c.name,&btv->i2c_client);
 466         return btv->i2c_rc;
 467 }
 468
 469 int __devexit fini_bttv_i2c(struct bttv *btv)
 470 {
 471         if (0 != btv->i2c_rc)
 472                 return 0;
 473
 474         return i2c_del_adapter(&btv->c.i2c_adap);
 475 }
 476
 477 /*
 478  * Local variables:
 479  * c-basic-offset: 8
 480  * End:
 481  */