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 int algo_control(struct i2c_adapter *adapter,
 128                         unsigned int cmd, unsigned long arg)
 129 {
 130         return 0;
 131 }
 132
 133 static u32 functionality(struct i2c_adapter *adap)
 134 {
 135         return I2C_FUNC_SMBUS_EMUL;
 136 }
 137
 138 static int
 139 bttv_i2c_wait_done(struct bttv *btv)
 140 {
 141         int rc = 0;
 142
 143         /* timeout */
 144         if (wait_event_interruptible_timeout(btv->i2c_queue,
 145                 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
 146
 147         rc = -EIO;
 148
 149         if (btv->i2c_done & BT848_INT_RACK)
 150                 rc = 1;
 151         btv->i2c_done = 0;
 152         return rc;
 153 }
 154
 155 #define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
 156                 BT848_I2C_SCL | BT848_I2C_SDA)
 157
 158 static int
 159 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 160 {
 161         u32 xmit;
 162         int retval,cnt;
 163
 164         /* sanity checks */
 165         if (0 == msg->len)
 166                 return -EINVAL;
 167
 168         /* start, address + first byte */
 169         xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
 170         if (msg->len > 1 || !last)
 171                 xmit |= BT878_I2C_NOSTOP;
 172         btwrite(xmit, BT848_I2C);
 173         retval = bttv_i2c_wait_done(btv);
 174         if (retval < 0)
 175                 goto err;
 176         if (retval == 0)
 177                 goto eio;
 178         if (i2c_debug) {
 179                 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
 180                 if (!(xmit & BT878_I2C_NOSTOP))
 181                         printk(" >\n");
 182         }
 183
 184         for (cnt = 1; cnt < msg->len; cnt++ ) {
 185                 /* following bytes */
 186                 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
 187                 if (cnt < msg->len-1 || !last)
 188                         xmit |= BT878_I2C_NOSTOP;
 189                 btwrite(xmit, BT848_I2C);
 190                 retval = bttv_i2c_wait_done(btv);
 191                 if (retval < 0)
 192                         goto err;
 193                 if (retval == 0)
 194                         goto eio;
 195                 if (i2c_debug) {
 196                         printk(" %02x", msg->buf[cnt]);
 197                         if (!(xmit & BT878_I2C_NOSTOP))
 198                                 printk(" >\n");
 199                 }
 200         }
 201         return msg->len;
 202
 203  eio:
 204         retval = -EIO;
 205  err:
 206         if (i2c_debug)
 207                 printk(" ERR: %d\n",retval);
 208         return retval;
 209 }
 210
 211 static int
 212 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 213 {
 214         u32 xmit;
 215         u32 cnt;
 216         int retval;
 217
 218         for(cnt = 0; cnt < msg->len; cnt++) {
 219                 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
 220                 if (cnt < msg->len-1)
 221                         xmit |= BT848_I2C_W3B;
 222                 if (cnt < msg->len-1 || !last)
 223                         xmit |= BT878_I2C_NOSTOP;
 224                 if (cnt)
 225                         xmit |= BT878_I2C_NOSTART;
 226                 btwrite(xmit, BT848_I2C);
 227                 retval = bttv_i2c_wait_done(btv);
 228                 if (retval < 0)
 229                         goto err;
 230                 if (retval == 0)
 231                         goto eio;
 232                 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
 233                 if (i2c_debug) {
 234                         if (!(xmit & BT878_I2C_NOSTART))
 235                                 printk(" <R %02x", (msg->addr << 1) +1);
 236                         printk(" =%02x", msg->buf[cnt]);
 237                         if (!(xmit & BT878_I2C_NOSTOP))
 238                                 printk(" >\n");
 239                 }
 240         }
 241         return msg->len;
 242
 243  eio:
 244         retval = -EIO;
 245  err:
 246         if (i2c_debug)
 247                 printk(" ERR: %d\n",retval);
 248         return retval;
 249 }
 250
 251 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
 252 {
 253         struct bttv *btv = i2c_get_adapdata(i2c_adap);
 254         int retval = 0;
 255         int i;
 256
 257         if (i2c_debug)
 258                 printk("bt-i2c:");
 259         btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
 260         for (i = 0 ; i < num; i++) {
 261                 if (msgs[i].flags & I2C_M_RD) {
 262                         /* read */
 263                         retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
 264                         if (retval < 0)
 265                                 goto err;
 266                 } else {
 267                         /* write */
 268                         retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
 269                         if (retval < 0)
 270                                 goto err;
 271                 }
 272         }
 273         return num;
 274
 275  err:
 276         return retval;
 277 }
 278
 279 static struct i2c_algorithm bttv_algo = {
 280         .master_xfer   = bttv_i2c_xfer,
 281         .algo_control  = algo_control,
 282         .functionality = functionality,
 283 };
 284
 285 static struct i2c_adapter bttv_i2c_adap_hw_template = {
 286         .owner             = THIS_MODULE,
 287         .class         = I2C_CLASS_TV_ANALOG,
 288         .name          = "bt878",
 289         .id            = I2C_HW_B_BT848 /* FIXME */,
 290         .algo          = &bttv_algo,
 291         .client_register = attach_inform,
 292 };
 293
 294 /* ----------------------------------------------------------------------- */
 295 /* I2C functions - common stuff                                            */
 296
 297 static int attach_inform(struct i2c_client *client)
 298 {
 299         struct bttv *btv = i2c_get_adapdata(client->adapter);
 300         int addr=ADDR_UNSET;
 301
 302
 303         if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr)
 304                 addr = bttv_tvcards[btv->c.type].tuner_addr;
 305
 306
 307         if (bttv_debug)
 308                 printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n",
 309                         btv->c.nr, client->driver->driver.name, client->addr,
 310                         client->name);
 311         if (!client->driver->command)
 312                 return 0;
 313
 314         if (client->driver->id == I2C_DRIVERID_MSP3400)
 315                 btv->i2c_msp34xx_client = client;
 316         if (client->driver->id == I2C_DRIVERID_TVAUDIO)
 317                 btv->i2c_tvaudio_client = client;
 318         if (btv->tuner_type != UNSET) {
 319                 struct tuner_setup tun_setup;
 320
 321                 if ((addr==ADDR_UNSET) ||
 322                                 (addr==client->addr)) {
 323
 324                         tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO;
 325                         tun_setup.type = btv->tuner_type;
 326                         tun_setup.addr = addr;
 327                         bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup);
 328                 }
 329
 330         }
 331
 332         return 0;
 333 }
 334
 335 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
 336 {
 337         if (0 != btv->i2c_rc)
 338                 return;
 339         i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
 340 }
 341
 342 static struct i2c_client bttv_i2c_client_template = {
 343         .name   = "bttv internal",
 344 };
 345
 346
 347 /* read I2C */
 348 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
 349 {
 350         unsigned char buffer = 0;
 351
 352         if (0 != btv->i2c_rc)
 353                 return -1;
 354         if (bttv_verbose && NULL != probe_for)
 355                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
 356                        btv->c.nr,probe_for,addr);
 357         btv->i2c_client.addr = addr >> 1;
 358         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
 359                 if (NULL != probe_for) {
 360                         if (bttv_verbose)
 361                                 printk("not found\n");
 362                 } else
 363                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
 364                                btv->c.nr,addr);
 365                 return -1;
 366         }
 367         if (bttv_verbose && NULL != probe_for)
 368                 printk("found\n");
 369         return buffer;
 370 }
 371
 372 /* write I2C */
 373 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
 374                     unsigned char b2, int both)
 375 {
 376         unsigned char buffer[2];
 377         int bytes = both ? 2 : 1;
 378
 379         if (0 != btv->i2c_rc)
 380                 return -1;
 381         btv->i2c_client.addr = addr >> 1;
 382         buffer[0] = b1;
 383         buffer[1] = b2;
 384         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
 385                 return -1;
 386         return 0;
 387 }
 388
 389 /* read EEPROM content */
 390 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
 391 {
 392         memset(eedata, 0, 256);
 393         if (0 != btv->i2c_rc)
 394                 return;
 395         btv->i2c_client.addr = addr >> 1;
 396         tveeprom_read(&btv->i2c_client, eedata, 256);
 397 }
 398
 399 static char *i2c_devs[128] = {
 400         [ 0x1c >> 1 ] = "lgdt330x",
 401         [ 0x30 >> 1 ] = "IR (hauppauge)",
 402         [ 0x80 >> 1 ] = "msp34xx",
 403         [ 0x86 >> 1 ] = "tda9887",
 404         [ 0xa0 >> 1 ] = "eeprom",
 405         [ 0xc0 >> 1 ] = "tuner (analog)",
 406         [ 0xc2 >> 1 ] = "tuner (analog)",
 407 };
 408
 409 static void do_i2c_scan(char *name, struct i2c_client *c)
 410 {
 411         unsigned char buf;
 412         int i,rc;
 413
 414         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 415                 c->addr = i;
 416                 rc = i2c_master_recv(c,&buf,0);
 417                 if (rc < 0)
 418                         continue;
 419                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 420                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 421         }
 422 }
 423
 424 /* init + register i2c algo-bit adapter */
 425 int __devinit init_bttv_i2c(struct bttv *btv)
 426 {
 427         memcpy(&btv->i2c_client, &bttv_i2c_client_template,
 428                sizeof(bttv_i2c_client_template));
 429
 430         if (i2c_hw)
 431                 btv->use_i2c_hw = 1;
 432         if (btv->use_i2c_hw) {
 433                 /* bt878 */
 434                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
 435                        sizeof(bttv_i2c_adap_hw_template));
 436         } else {
 437                 /* bt848 */
 438         /* Prevents usage of invalid delay values */
 439                 if (i2c_udelay<5)
 440                         i2c_udelay=5;
 441                 bttv_i2c_algo_bit_template.udelay=i2c_udelay;
 442
 443                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
 444                        sizeof(bttv_i2c_adap_sw_template));
 445                 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
 446                        sizeof(bttv_i2c_algo_bit_template));
 447                 btv->i2c_algo.data = btv;
 448                 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
 449         }
 450
 451         btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
 452         snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
 453                  "bt%d #%d [%s]", btv->id, btv->c.nr,
 454                  btv->use_i2c_hw ? "hw" : "sw");
 455
 456         i2c_set_adapdata(&btv->c.i2c_adap, btv);
 457         btv->i2c_client.adapter = &btv->c.i2c_adap;
 458
 459         if (bttv_tvcards[btv->c.type].no_video)
 460                 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
 461         if (bttv_tvcards[btv->c.type].has_dvb)
 462                 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
 463
 464         if (btv->use_i2c_hw) {
 465                 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
 466         } else {
 467                 bttv_bit_setscl(btv,1);
 468                 bttv_bit_setsda(btv,1);
 469                 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
 470         }
 471         if (0 == btv->i2c_rc && i2c_scan)
 472                 do_i2c_scan(btv->c.name,&btv->i2c_client);
 473         return btv->i2c_rc;
 474 }
 475
 476 int __devexit fini_bttv_i2c(struct bttv *btv)
 477 {
 478         if (0 != btv->i2c_rc)
 479                 return 0;
 480
 481         return i2c_del_adapter(&btv->c.i2c_adap);
 482 }
 483
 484 /*
 485  * Local variables:
 486  * c-basic-offset: 8
 487  * End:
 488  */