drivers/media/video/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     This program is free software; you can redistribute it and/or modify
  12     it under the terms of the GNU General Public License as published by
  13     the Free Software Foundation; either version 2 of the License, or
  14     (at your option) any later version.
  15
  16     This program is distributed in the hope that it will be useful,
  17     but WITHOUT ANY WARRANTY; without even the implied warranty of
  18     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19     GNU General Public License for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with this program; if not, write to the Free Software
  23     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 */
  26
  27 #include <linux/module.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/init.h>
  30 #include <linux/delay.h>
  31 #include <linux/jiffies.h>
  32 #include <asm/io.h>
  33
  34 #include "bttvp.h"
  35
  36 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template;
  37 static struct i2c_adapter bttv_i2c_adap_sw_template;
  38 static struct i2c_adapter bttv_i2c_adap_hw_template;
  39 static struct i2c_client bttv_i2c_client_template;
  40
  41 static int attach_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 static 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 static 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         .name              = "bt848",
 112         .id                = I2C_HW_B_BT848,
 113         .client_register   = attach_inform,
 114 };
 115
 116 /* ----------------------------------------------------------------------- */
 117 /* I2C functions - hardware i2c                                            */
 118
 119 static int algo_control(struct i2c_adapter *adapter,
 120                         unsigned int cmd, unsigned long arg)
 121 {
 122         return 0;
 123 }
 124
 125 static u32 functionality(struct i2c_adapter *adap)
 126 {
 127         return I2C_FUNC_SMBUS_EMUL;
 128 }
 129
 130 static int
 131 bttv_i2c_wait_done(struct bttv *btv)
 132 {
 133         int rc = 0;
 134
 135         /* timeout */
 136         if (wait_event_interruptible_timeout(btv->i2c_queue,
 137                 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
 138
 139         rc = -EIO;
 140
 141         if (btv->i2c_done & BT848_INT_RACK)
 142                 rc = 1;
 143         btv->i2c_done = 0;
 144         return rc;
 145 }
 146
 147 #define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
 148                 BT848_I2C_SCL | BT848_I2C_SDA)
 149
 150 static int
 151 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 152 {
 153         u32 xmit;
 154         int retval,cnt;
 155
 156         /* sanity checks */
 157         if (0 == msg->len)
 158                 return -EINVAL;
 159
 160         /* start, address + first byte */
 161         xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
 162         if (msg->len > 1 || !last)
 163                 xmit |= BT878_I2C_NOSTOP;
 164         btwrite(xmit, BT848_I2C);
 165         retval = bttv_i2c_wait_done(btv);
 166         if (retval < 0)
 167                 goto err;
 168         if (retval == 0)
 169                 goto eio;
 170         if (i2c_debug) {
 171                 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
 172                 if (!(xmit & BT878_I2C_NOSTOP))
 173                         printk(" >\n");
 174         }
 175
 176         for (cnt = 1; cnt < msg->len; cnt++ ) {
 177                 /* following bytes */
 178                 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
 179                 if (cnt < msg->len-1 || !last)
 180                         xmit |= BT878_I2C_NOSTOP;
 181                 btwrite(xmit, BT848_I2C);
 182                 retval = bttv_i2c_wait_done(btv);
 183                 if (retval < 0)
 184                         goto err;
 185                 if (retval == 0)
 186                         goto eio;
 187                 if (i2c_debug) {
 188                         printk(" %02x", msg->buf[cnt]);
 189                         if (!(xmit & BT878_I2C_NOSTOP))
 190                                 printk(" >\n");
 191                 }
 192         }
 193         return msg->len;
 194
 195  eio:
 196         retval = -EIO;
 197  err:
 198         if (i2c_debug)
 199                 printk(" ERR: %d\n",retval);
 200         return retval;
 201 }
 202
 203 static int
 204 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 205 {
 206         u32 xmit;
 207         u32 cnt;
 208         int retval;
 209
 210         for(cnt = 0; cnt < msg->len; cnt++) {
 211                 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
 212                 if (cnt < msg->len-1)
 213                         xmit |= BT848_I2C_W3B;
 214                 if (cnt < msg->len-1 || !last)
 215                         xmit |= BT878_I2C_NOSTOP;
 216                 if (cnt)
 217                         xmit |= BT878_I2C_NOSTART;
 218                 btwrite(xmit, BT848_I2C);
 219                 retval = bttv_i2c_wait_done(btv);
 220                 if (retval < 0)
 221                         goto err;
 222                 if (retval == 0)
 223                         goto eio;
 224                 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
 225                 if (i2c_debug) {
 226                         if (!(xmit & BT878_I2C_NOSTART))
 227                                 printk(" <R %02x", (msg->addr << 1) +1);
 228                         printk(" =%02x", msg->buf[cnt]);
 229                         if (!(xmit & BT878_I2C_NOSTOP))
 230                                 printk(" >\n");
 231                 }
 232         }
 233         return msg->len;
 234
 235  eio:
 236         retval = -EIO;
 237  err:
 238         if (i2c_debug)
 239                 printk(" ERR: %d\n",retval);
 240         return retval;
 241 }
 242
 243 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
 244 {
 245         struct bttv *btv = i2c_get_adapdata(i2c_adap);
 246         int retval = 0;
 247         int i;
 248
 249         if (i2c_debug)
 250                 printk("bt-i2c:");
 251         btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
 252         for (i = 0 ; i < num; i++) {
 253                 if (msgs[i].flags & I2C_M_RD) {
 254                         /* read */
 255                         retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
 256                         if (retval < 0)
 257                                 goto err;
 258                 } else {
 259                         /* write */
 260                         retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
 261                         if (retval < 0)
 262                                 goto err;
 263                 }
 264         }
 265         return num;
 266
 267  err:
 268         return retval;
 269 }
 270
 271 static struct i2c_algorithm bttv_algo = {
 272         .master_xfer   = bttv_i2c_xfer,
 273         .algo_control  = algo_control,
 274         .functionality = functionality,
 275 };
 276
 277 static struct i2c_adapter bttv_i2c_adap_hw_template = {
 278         .owner         = THIS_MODULE,
 279 #ifdef I2C_CLASS_TV_ANALOG
 280         .class         = I2C_CLASS_TV_ANALOG,
 281 #endif
 282         .name          = "bt878",
 283         .id            = I2C_HW_B_BT848 /* FIXME */,
 284         .algo          = &bttv_algo,
 285         .client_register = attach_inform,
 286 };
 287
 288 /* ----------------------------------------------------------------------- */
 289 /* I2C functions - common stuff                                            */
 290
 291 static int attach_inform(struct i2c_client *client)
 292 {
 293         struct bttv *btv = i2c_get_adapdata(client->adapter);
 294         int addr=ADDR_UNSET;
 295
 296
 297         if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr)
 298                 addr = bttv_tvcards[btv->c.type].tuner_addr;
 299
 300
 301         if (bttv_debug)
 302                 printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n",
 303                         btv->c.nr,client->driver->name,client->addr,
 304                         client->name);
 305         if (!client->driver->command)
 306                 return 0;
 307
 308         if (btv->tuner_type != UNSET) {
 309                 struct tuner_setup tun_setup;
 310
 311                 if ((addr==ADDR_UNSET) ||
 312                                 (addr==client->addr)) {
 313
 314                         tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO;
 315                         tun_setup.type = btv->tuner_type;
 316                         tun_setup.addr = addr;
 317                         bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup);
 318                 }
 319
 320         }
 321
 322         return 0;
 323 }
 324
 325 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
 326 {
 327         if (0 != btv->i2c_rc)
 328                 return;
 329         i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
 330 }
 331
 332 static struct i2c_client bttv_i2c_client_template = {
 333         .name   = "bttv internal",
 334 };
 335
 336
 337 /* read I2C */
 338 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
 339 {
 340         unsigned char buffer = 0;
 341
 342         if (0 != btv->i2c_rc)
 343                 return -1;
 344         if (bttv_verbose && NULL != probe_for)
 345                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
 346                        btv->c.nr,probe_for,addr);
 347         btv->i2c_client.addr = addr >> 1;
 348         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
 349                 if (NULL != probe_for) {
 350                         if (bttv_verbose)
 351                                 printk("not found\n");
 352                 } else
 353                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
 354                                btv->c.nr,addr);
 355                 return -1;
 356         }
 357         if (bttv_verbose && NULL != probe_for)
 358                 printk("found\n");
 359         return buffer;
 360 }
 361
 362 /* write I2C */
 363 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
 364                     unsigned char b2, int both)
 365 {
 366         unsigned char buffer[2];
 367         int bytes = both ? 2 : 1;
 368
 369         if (0 != btv->i2c_rc)
 370                 return -1;
 371         btv->i2c_client.addr = addr >> 1;
 372         buffer[0] = b1;
 373         buffer[1] = b2;
 374         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
 375                 return -1;
 376         return 0;
 377 }
 378
 379 /* read EEPROM content */
 380 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
 381 {
 382         memset(eedata, 0, 256);
 383         if (0 != btv->i2c_rc)
 384                 return;
 385         btv->i2c_client.addr = addr >> 1;
 386         tveeprom_read(&btv->i2c_client, eedata, 256);
 387 }
 388
 389 static char *i2c_devs[128] = {
 390         [ 0x1c >> 1 ] = "lgdt330x",
 391         [ 0x30 >> 1 ] = "IR (hauppauge)",
 392         [ 0x80 >> 1 ] = "msp34xx",
 393         [ 0x86 >> 1 ] = "tda9887",
 394         [ 0xa0 >> 1 ] = "eeprom",
 395         [ 0xc0 >> 1 ] = "tuner (analog)",
 396         [ 0xc2 >> 1 ] = "tuner (analog)",
 397 };
 398
 399 static void do_i2c_scan(char *name, struct i2c_client *c)
 400 {
 401         unsigned char buf;
 402         int i,rc;
 403
 404         for (i = 0; i < 128; i++) {
 405                 c->addr = i;
 406                 rc = i2c_master_recv(c,&buf,0);
 407                 if (rc < 0)
 408                         continue;
 409                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 410                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 411         }
 412 }
 413
 414 /* init + register i2c algo-bit adapter */
 415 int __devinit init_bttv_i2c(struct bttv *btv)
 416 {
 417         memcpy(&btv->i2c_client, &bttv_i2c_client_template,
 418                sizeof(bttv_i2c_client_template));
 419
 420         if (i2c_hw)
 421                 btv->use_i2c_hw = 1;
 422         if (btv->use_i2c_hw) {
 423                 /* bt878 */
 424                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
 425                        sizeof(bttv_i2c_adap_hw_template));
 426         } else {
 427                 /* bt848 */
 428                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
 429                        sizeof(bttv_i2c_adap_sw_template));
 430                 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
 431                        sizeof(bttv_i2c_algo_bit_template));
 432                 btv->i2c_algo.data = btv;
 433                 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
 434         }
 435
 436         btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
 437         snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
 438                  "bt%d #%d [%s]", btv->id, btv->c.nr,
 439                  btv->use_i2c_hw ? "hw" : "sw");
 440
 441         i2c_set_adapdata(&btv->c.i2c_adap, btv);
 442         btv->i2c_client.adapter = &btv->c.i2c_adap;
 443
 444 #ifdef I2C_CLASS_TV_ANALOG
 445         if (bttv_tvcards[btv->c.type].no_video)
 446                 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
 447         if (bttv_tvcards[btv->c.type].has_dvb)
 448                 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
 449 #endif
 450
 451         if (btv->use_i2c_hw) {
 452                 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
 453         } else {
 454                 bttv_bit_setscl(btv,1);
 455                 bttv_bit_setsda(btv,1);
 456                 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
 457         }
 458         if (0 == btv->i2c_rc && i2c_scan)
 459                 do_i2c_scan(btv->c.name,&btv->i2c_client);
 460         return btv->i2c_rc;
 461 }
 462
 463 int __devexit fini_bttv_i2c(struct bttv *btv)
 464 {
 465         if (0 != btv->i2c_rc)
 466                 return 0;
 467
 468         if (btv->use_i2c_hw) {
 469                 return i2c_del_adapter(&btv->c.i2c_adap);
 470         } else {
 471                 return i2c_bit_del_bus(&btv->c.i2c_adap);
 472         }
 473 }
 474
 475 /*
 476  * Local variables:
 477  * c-basic-offset: 8
 478  * End:
 479  */