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