drivers/media/video/bttv-i2c.c

   1 /*
   2     $Id: bttv-i2c.c,v 1.13 2004/11/07 13:17:15 kraxel Exp $
   3
   4     bttv-i2c.c  --  all the i2c code is here
   5
   6     bttv - Bt848 frame grabber driver
   7
   8     Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
   9                            & Marcus Metzler (mocm@thp.uni-koeln.de)
  10     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
  11
  12     This program is free software; you can redistribute it and/or modify
  13     it under the terms of the GNU General Public License as published by
  14     the Free Software Foundation; either version 2 of the License, or
  15     (at your option) any later version.
  16
  17     This program is distributed in the hope that it will be useful,
  18     but WITHOUT ANY WARRANTY; without even the implied warranty of
  19     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20     GNU General Public License for more details.
  21
  22     You should have received a copy of the GNU General Public License
  23     along with this program; if not, write to the Free Software
  24     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25
  26 */
  27
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/delay.h>
  31 #include <asm/io.h>
  32
  33 #include "bttvp.h"
  34
  35 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template;
  36 static struct i2c_adapter bttv_i2c_adap_sw_template;
  37 static struct i2c_adapter bttv_i2c_adap_hw_template;
  38 static struct i2c_client bttv_i2c_client_template;
  39
  40 static int attach_inform(struct i2c_client *client);
  41 static int detach_inform(struct i2c_client *client);
  42
  43 static int i2c_debug = 0;
  44 static int i2c_hw = 0;
  45 static int i2c_scan = 0;
  46 module_param(i2c_debug, int, 0644);
  47 module_param(i2c_hw,    int, 0444);
  48 module_param(i2c_scan,  int, 0444);
  49 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
  50
  51 /* ----------------------------------------------------------------------- */
  52 /* I2C functions - bitbanging adapter (software i2c)                       */
  53
  54 void bttv_bit_setscl(void *data, int state)
  55 {
  56         struct bttv *btv = (struct bttv*)data;
  57
  58         if (state)
  59                 btv->i2c_state |= 0x02;
  60         else
  61                 btv->i2c_state &= ~0x02;
  62         btwrite(btv->i2c_state, BT848_I2C);
  63         btread(BT848_I2C);
  64 }
  65
  66 void bttv_bit_setsda(void *data, int state)
  67 {
  68         struct bttv *btv = (struct bttv*)data;
  69
  70         if (state)
  71                 btv->i2c_state |= 0x01;
  72         else
  73                 btv->i2c_state &= ~0x01;
  74         btwrite(btv->i2c_state, BT848_I2C);
  75         btread(BT848_I2C);
  76 }
  77
  78 static int bttv_bit_getscl(void *data)
  79 {
  80         struct bttv *btv = (struct bttv*)data;
  81         int state;
  82
  83         state = btread(BT848_I2C) & 0x02 ? 1 : 0;
  84         return state;
  85 }
  86
  87 static int bttv_bit_getsda(void *data)
  88 {
  89         struct bttv *btv = (struct bttv*)data;
  90         int state;
  91
  92         state = btread(BT848_I2C) & 0x01;
  93         return state;
  94 }
  95
  96 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = {
  97         .setsda  = bttv_bit_setsda,
  98         .setscl  = bttv_bit_setscl,
  99         .getsda  = bttv_bit_getsda,
 100         .getscl  = bttv_bit_getscl,
 101         .udelay  = 16,
 102         .mdelay  = 10,
 103         .timeout = 200,
 104 };
 105
 106 static struct i2c_adapter bttv_i2c_adap_sw_template = {
 107         .owner             = THIS_MODULE,
 108 #ifdef I2C_CLASS_TV_ANALOG
 109         .class             = I2C_CLASS_TV_ANALOG,
 110 #endif
 111         I2C_DEVNAME("bt848"),
 112         .id                = I2C_HW_B_BT848,
 113         .client_register   = attach_inform,
 114         .client_unregister = detach_inform,
 115 };
 116
 117 /* ----------------------------------------------------------------------- */
 118 /* I2C functions - hardware i2c                                            */
 119
 120 static int algo_control(struct i2c_adapter *adapter,
 121                         unsigned int cmd, unsigned long arg)
 122 {
 123         return 0;
 124 }
 125
 126 static u32 functionality(struct i2c_adapter *adap)
 127 {
 128         return I2C_FUNC_SMBUS_EMUL;
 129 }
 130
 131 static int
 132 bttv_i2c_wait_done(struct bttv *btv)
 133 {
 134         DECLARE_WAITQUEUE(wait, current);
 135         int rc = 0;
 136
 137         add_wait_queue(&btv->i2c_queue, &wait);
 138         if (0 == btv->i2c_done)
 139                 msleep_interruptible(20);
 140         remove_wait_queue(&btv->i2c_queue, &wait);
 141
 142         if (0 == btv->i2c_done)
 143                 /* timeout */
 144                 rc = -EIO;
 145         if (btv->i2c_done & BT848_INT_RACK)
 146                 rc = 1;
 147         btv->i2c_done = 0;
 148         return rc;
 149 }
 150
 151 #define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
 152                 BT848_I2C_SCL | BT848_I2C_SDA)
 153
 154 static int
 155 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 156 {
 157         u32 xmit;
 158         int retval,cnt;
 159
 160         /* sanity checks */
 161         if (0 == msg->len)
 162                 return -EINVAL;
 163
 164         /* start, address + first byte */
 165         xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
 166         if (msg->len > 1 || !last)
 167                 xmit |= BT878_I2C_NOSTOP;
 168         btwrite(xmit, BT848_I2C);
 169         retval = bttv_i2c_wait_done(btv);
 170         if (retval < 0)
 171                 goto err;
 172         if (retval == 0)
 173                 goto eio;
 174         if (i2c_debug) {
 175                 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
 176                 if (!(xmit & BT878_I2C_NOSTOP))
 177                         printk(" >\n");
 178         }
 179
 180         for (cnt = 1; cnt < msg->len; cnt++ ) {
 181                 /* following bytes */
 182                 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
 183                 if (cnt < msg->len-1 || !last)
 184                         xmit |= BT878_I2C_NOSTOP;
 185                 btwrite(xmit, BT848_I2C);
 186                 retval = bttv_i2c_wait_done(btv);
 187                 if (retval < 0)
 188                         goto err;
 189                 if (retval == 0)
 190                         goto eio;
 191                 if (i2c_debug) {
 192                         printk(" %02x", msg->buf[cnt]);
 193                         if (!(xmit & BT878_I2C_NOSTOP))
 194                                 printk(" >\n");
 195                 }
 196         }
 197         return msg->len;
 198
 199  eio:
 200         retval = -EIO;
 201  err:
 202         if (i2c_debug)
 203                 printk(" ERR: %d\n",retval);
 204         return retval;
 205 }
 206
 207 static int
 208 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 209 {
 210         u32 xmit;
 211         u32 cnt;
 212         int retval;
 213
 214         for(cnt = 0; cnt < msg->len; cnt++) {
 215                 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
 216                 if (cnt < msg->len-1)
 217                         xmit |= BT848_I2C_W3B;
 218                 if (cnt < msg->len-1 || !last)
 219                         xmit |= BT878_I2C_NOSTOP;
 220                 if (cnt)
 221                         xmit |= BT878_I2C_NOSTART;
 222                 btwrite(xmit, BT848_I2C);
 223                 retval = bttv_i2c_wait_done(btv);
 224                 if (retval < 0)
 225                         goto err;
 226                 if (retval == 0)
 227                         goto eio;
 228                 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
 229                 if (i2c_debug) {
 230                         if (!(xmit & BT878_I2C_NOSTART))
 231                                 printk(" <R %02x", (msg->addr << 1) +1);
 232                         printk(" =%02x", msg->buf[cnt]);
 233                         if (!(xmit & BT878_I2C_NOSTOP))
 234                                 printk(" >\n");
 235                 }
 236         }
 237         return msg->len;
 238
 239  eio:
 240         retval = -EIO;
 241  err:
 242         if (i2c_debug)
 243                 printk(" ERR: %d\n",retval);
 244         return retval;
 245 }
 246
 247 int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
 248 {
 249         struct bttv *btv = i2c_get_adapdata(i2c_adap);
 250         int retval = 0;
 251         int i;
 252
 253         if (i2c_debug)
 254                 printk("bt-i2c:");
 255         btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
 256         for (i = 0 ; i < num; i++) {
 257                 if (msgs[i].flags & I2C_M_RD) {
 258                         /* read */
 259                         retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
 260                         if (retval < 0)
 261                                 goto err;
 262                 } else {
 263                         /* write */
 264                         retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
 265                         if (retval < 0)
 266                                 goto err;
 267                 }
 268         }
 269         return num;
 270
 271  err:
 272         return retval;
 273 }
 274
 275 static struct i2c_algorithm bttv_algo = {
 276         .name          = "bt878",
 277         .id            = I2C_ALGO_BIT | I2C_HW_B_BT848 /* FIXME */,
 278         .master_xfer   = bttv_i2c_xfer,
 279         .algo_control  = algo_control,
 280         .functionality = functionality,
 281 };
 282
 283 static struct i2c_adapter bttv_i2c_adap_hw_template = {
 284         .owner         = THIS_MODULE,
 285 #ifdef I2C_CLASS_TV_ANALOG
 286         .class         = I2C_CLASS_TV_ANALOG,
 287 #endif
 288         I2C_DEVNAME("bt878"),
 289         .id            = I2C_ALGO_BIT | I2C_HW_B_BT848 /* FIXME */,
 290         .algo          = &bttv_algo,
 291         .client_register = attach_inform,
 292         .client_unregister = detach_inform,
 293 };
 294
 295 /* ----------------------------------------------------------------------- */
 296 /* I2C functions - common stuff                                            */
 297
 298 static int attach_inform(struct i2c_client *client)
 299 {
 300         struct bttv *btv = i2c_get_adapdata(client->adapter);
 301
 302         if (btv->tuner_type != UNSET)
 303                 bttv_call_i2c_clients(btv,TUNER_SET_TYPE,&btv->tuner_type);
 304         if (btv->pinnacle_id != UNSET)
 305                 bttv_call_i2c_clients(btv,AUDC_CONFIG_PINNACLE,
 306                                       &btv->pinnacle_id);
 307         bttv_i2c_info(&btv->c, client, 1);
 308
 309         if (bttv_debug)
 310                 printk("bttv%d: i2c attach [client=%s]\n",
 311                        btv->c.nr, i2c_clientname(client));
 312         return 0;
 313 }
 314
 315 static int detach_inform(struct i2c_client *client)
 316 {
 317         struct bttv *btv = i2c_get_adapdata(client->adapter);
 318
 319         bttv_i2c_info(&btv->c, client, 0);
 320         return 0;
 321 }
 322
 323 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
 324 {
 325         if (0 != btv->i2c_rc)
 326                 return;
 327         i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
 328 }
 329
 330 void bttv_i2c_call(unsigned int card, unsigned int cmd, void *arg)
 331 {
 332         if (card >= bttv_num)
 333                 return;
 334         bttv_call_i2c_clients(&bttvs[card], cmd, arg);
 335 }
 336
 337 static struct i2c_client bttv_i2c_client_template = {
 338         I2C_DEVNAME("bttv internal"),
 339         .id       = -1,
 340 };
 341
 342
 343 /* read I2C */
 344 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
 345 {
 346         unsigned char buffer = 0;
 347
 348         if (0 != btv->i2c_rc)
 349                 return -1;
 350         if (bttv_verbose && NULL != probe_for)
 351                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
 352                        btv->c.nr,probe_for,addr);
 353         btv->i2c_client.addr = addr >> 1;
 354         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
 355                 if (NULL != probe_for) {
 356                         if (bttv_verbose)
 357                                 printk("not found\n");
 358                 } else
 359                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
 360                                btv->c.nr,addr);
 361                 return -1;
 362         }
 363         if (bttv_verbose && NULL != probe_for)
 364                 printk("found\n");
 365         return buffer;
 366 }
 367
 368 /* write I2C */
 369 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
 370                     unsigned char b2, int both)
 371 {
 372         unsigned char buffer[2];
 373         int bytes = both ? 2 : 1;
 374
 375         if (0 != btv->i2c_rc)
 376                 return -1;
 377         btv->i2c_client.addr = addr >> 1;
 378         buffer[0] = b1;
 379         buffer[1] = b2;
 380         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
 381                 return -1;
 382         return 0;
 383 }
 384
 385 /* read EEPROM content */
 386 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
 387 {
 388         int i;
 389
 390         if (bttv_I2CWrite(btv, addr, 0, -1, 0)<0) {
 391                 printk(KERN_WARNING "bttv: readee error\n");
 392                 return;
 393         }
 394         btv->i2c_client.addr = addr >> 1;
 395         for (i=0; i<256; i+=16) {
 396                 if (16 != i2c_master_recv(&btv->i2c_client,eedata+i,16)) {
 397                         printk(KERN_WARNING "bttv: readee error\n");
 398                         break;
 399                 }
 400         }
 401 }
 402
 403 static char *i2c_devs[128] = {
 404         [ 0x30 >> 1 ] = "IR (hauppauge)",
 405         [ 0x80 >> 1 ] = "msp34xx",
 406         [ 0x86 >> 1 ] = "tda9887",
 407         [ 0xa0 >> 1 ] = "eeprom",
 408         [ 0xc0 >> 1 ] = "tuner (analog)",
 409         [ 0xc2 >> 1 ] = "tuner (analog)",
 410 };
 411
 412 static void do_i2c_scan(char *name, struct i2c_client *c)
 413 {
 414         unsigned char buf;
 415         int i,rc;
 416
 417         for (i = 0; i < 128; i++) {
 418                 c->addr = i;
 419                 rc = i2c_master_recv(c,&buf,0);
 420                 if (rc < 0)
 421                         continue;
 422                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 423                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 424         }
 425 }
 426
 427 /* init + register i2c algo-bit adapter */
 428 int __devinit init_bttv_i2c(struct bttv *btv)
 429 {
 430         memcpy(&btv->i2c_client, &bttv_i2c_client_template,
 431                sizeof(bttv_i2c_client_template));
 432
 433         if (i2c_hw)
 434                 btv->use_i2c_hw = 1;
 435         if (btv->use_i2c_hw) {
 436                 /* bt878 */
 437                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
 438                        sizeof(bttv_i2c_adap_hw_template));
 439         } else {
 440                 /* bt848 */
 441                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
 442                        sizeof(bttv_i2c_adap_sw_template));
 443                 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
 444                        sizeof(bttv_i2c_algo_bit_template));
 445                 btv->i2c_algo.data = btv;
 446                 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
 447         }
 448
 449         btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
 450         snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
 451                  "bt%d #%d [%s]", btv->id, btv->c.nr,
 452                  btv->use_i2c_hw ? "hw" : "sw");
 453
 454         i2c_set_adapdata(&btv->c.i2c_adap, btv);
 455         btv->i2c_client.adapter = &btv->c.i2c_adap;
 456
 457 #ifdef I2C_CLASS_TV_ANALOG
 458         if (bttv_tvcards[btv->c.type].no_video)
 459                 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
 460         if (bttv_tvcards[btv->c.type].has_dvb)
 461                 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
 462 #endif
 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         if (btv->use_i2c_hw) {
 482                 return i2c_del_adapter(&btv->c.i2c_adap);
 483         } else {
 484                 return i2c_bit_del_bus(&btv->c.i2c_adap);
 485         }
 486 }
 487
 488 /*
 489  * Local variables:
 490  * c-basic-offset: 8
 491  * End:
 492  */