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 <media/v4l2-common.h>
  34 #include <linux/jiffies.h>
  35 #include <asm/io.h>
  36
  37 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template;
  38 static struct i2c_adapter bttv_i2c_adap_sw_template;
  39 static struct i2c_adapter bttv_i2c_adap_hw_template;
  40 static struct i2c_client bttv_i2c_client_template;
  41
  42 static int attach_inform(struct i2c_client *client);
  43
  44 static int i2c_debug = 0;
  45 static int i2c_hw = 0;
  46 static int i2c_scan = 0;
  47 module_param(i2c_debug, int, 0644);
  48 module_param(i2c_hw,    int, 0444);
  49 module_param(i2c_scan,  int, 0444);
  50 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
  51
  52 /* ----------------------------------------------------------------------- */
  53 /* I2C functions - bitbanging adapter (software i2c)                       */
  54
  55 static void bttv_bit_setscl(void *data, int state)
  56 {
  57         struct bttv *btv = (struct bttv*)data;
  58
  59         if (state)
  60                 btv->i2c_state |= 0x02;
  61         else
  62                 btv->i2c_state &= ~0x02;
  63         btwrite(btv->i2c_state, BT848_I2C);
  64         btread(BT848_I2C);
  65 }
  66
  67 static void bttv_bit_setsda(void *data, int state)
  68 {
  69         struct bttv *btv = (struct bttv*)data;
  70
  71         if (state)
  72                 btv->i2c_state |= 0x01;
  73         else
  74                 btv->i2c_state &= ~0x01;
  75         btwrite(btv->i2c_state, BT848_I2C);
  76         btread(BT848_I2C);
  77 }
  78
  79 static int bttv_bit_getscl(void *data)
  80 {
  81         struct bttv *btv = (struct bttv*)data;
  82         int state;
  83
  84         state = btread(BT848_I2C) & 0x02 ? 1 : 0;
  85         return state;
  86 }
  87
  88 static int bttv_bit_getsda(void *data)
  89 {
  90         struct bttv *btv = (struct bttv*)data;
  91         int state;
  92
  93         state = btread(BT848_I2C) & 0x01;
  94         return state;
  95 }
  96
  97 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = {
  98         .setsda  = bttv_bit_setsda,
  99         .setscl  = bttv_bit_setscl,
 100         .getsda  = bttv_bit_getsda,
 101         .getscl  = bttv_bit_getscl,
 102         .udelay  = 16,
 103         .mdelay  = 10,
 104         .timeout = 200,
 105 };
 106
 107 static struct i2c_adapter bttv_i2c_adap_sw_template = {
 108         .owner             = THIS_MODULE,
 109         .class             = I2C_CLASS_TV_ANALOG,
 110         .name              = "bttv",
 111         .id                = I2C_HW_B_BT848,
 112         .client_register   = attach_inform,
 113 };
 114
 115 /* ----------------------------------------------------------------------- */
 116 /* I2C functions - hardware i2c                                            */
 117
 118 static int algo_control(struct i2c_adapter *adapter,
 119                         unsigned int cmd, unsigned long arg)
 120 {
 121         return 0;
 122 }
 123
 124 static u32 functionality(struct i2c_adapter *adap)
 125 {
 126         return I2C_FUNC_SMBUS_EMUL;
 127 }
 128
 129 static int
 130 bttv_i2c_wait_done(struct bttv *btv)
 131 {
 132         int rc = 0;
 133
 134         /* timeout */
 135         if (wait_event_interruptible_timeout(btv->i2c_queue,
 136                 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
 137
 138         rc = -EIO;
 139
 140         if (btv->i2c_done & BT848_INT_RACK)
 141                 rc = 1;
 142         btv->i2c_done = 0;
 143         return rc;
 144 }
 145
 146 #define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
 147                 BT848_I2C_SCL | BT848_I2C_SDA)
 148
 149 static int
 150 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 151 {
 152         u32 xmit;
 153         int retval,cnt;
 154
 155         /* sanity checks */
 156         if (0 == msg->len)
 157                 return -EINVAL;
 158
 159         /* start, address + first byte */
 160         xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
 161         if (msg->len > 1 || !last)
 162                 xmit |= BT878_I2C_NOSTOP;
 163         btwrite(xmit, BT848_I2C);
 164         retval = bttv_i2c_wait_done(btv);
 165         if (retval < 0)
 166                 goto err;
 167         if (retval == 0)
 168                 goto eio;
 169         if (i2c_debug) {
 170                 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
 171                 if (!(xmit & BT878_I2C_NOSTOP))
 172                         printk(" >\n");
 173         }
 174
 175         for (cnt = 1; cnt < msg->len; cnt++ ) {
 176                 /* following bytes */
 177                 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
 178                 if (cnt < msg->len-1 || !last)
 179                         xmit |= BT878_I2C_NOSTOP;
 180                 btwrite(xmit, BT848_I2C);
 181                 retval = bttv_i2c_wait_done(btv);
 182                 if (retval < 0)
 183                         goto err;
 184                 if (retval == 0)
 185                         goto eio;
 186                 if (i2c_debug) {
 187                         printk(" %02x", msg->buf[cnt]);
 188                         if (!(xmit & BT878_I2C_NOSTOP))
 189                                 printk(" >\n");
 190                 }
 191         }
 192         return msg->len;
 193
 194  eio:
 195         retval = -EIO;
 196  err:
 197         if (i2c_debug)
 198                 printk(" ERR: %d\n",retval);
 199         return retval;
 200 }
 201
 202 static int
 203 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 204 {
 205         u32 xmit;
 206         u32 cnt;
 207         int retval;
 208
 209         for(cnt = 0; cnt < msg->len; cnt++) {
 210                 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
 211                 if (cnt < msg->len-1)
 212                         xmit |= BT848_I2C_W3B;
 213                 if (cnt < msg->len-1 || !last)
 214                         xmit |= BT878_I2C_NOSTOP;
 215                 if (cnt)
 216                         xmit |= BT878_I2C_NOSTART;
 217                 btwrite(xmit, BT848_I2C);
 218                 retval = bttv_i2c_wait_done(btv);
 219                 if (retval < 0)
 220                         goto err;
 221                 if (retval == 0)
 222                         goto eio;
 223                 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
 224                 if (i2c_debug) {
 225                         if (!(xmit & BT878_I2C_NOSTART))
 226                                 printk(" <R %02x", (msg->addr << 1) +1);
 227                         printk(" =%02x", msg->buf[cnt]);
 228                         if (!(xmit & BT878_I2C_NOSTOP))
 229                                 printk(" >\n");
 230                 }
 231         }
 232         return msg->len;
 233
 234  eio:
 235         retval = -EIO;
 236  err:
 237         if (i2c_debug)
 238                 printk(" ERR: %d\n",retval);
 239         return retval;
 240 }
 241
 242 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
 243 {
 244         struct bttv *btv = i2c_get_adapdata(i2c_adap);
 245         int retval = 0;
 246         int i;
 247
 248         if (i2c_debug)
 249                 printk("bt-i2c:");
 250         btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
 251         for (i = 0 ; i < num; i++) {
 252                 if (msgs[i].flags & I2C_M_RD) {
 253                         /* read */
 254                         retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
 255                         if (retval < 0)
 256                                 goto err;
 257                 } else {
 258                         /* write */
 259                         retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
 260                         if (retval < 0)
 261                                 goto err;
 262                 }
 263         }
 264         return num;
 265
 266  err:
 267         return retval;
 268 }
 269
 270 static struct i2c_algorithm bttv_algo = {
 271         .master_xfer   = bttv_i2c_xfer,
 272         .algo_control  = algo_control,
 273         .functionality = functionality,
 274 };
 275
 276 static struct i2c_adapter bttv_i2c_adap_hw_template = {
 277         .owner             = THIS_MODULE,
 278         .class         = I2C_CLASS_TV_ANALOG,
 279         .name          = "bt878",
 280         .id            = I2C_HW_B_BT848 /* FIXME */,
 281         .algo          = &bttv_algo,
 282         .client_register = attach_inform,
 283 };
 284
 285 /* ----------------------------------------------------------------------- */
 286 /* I2C functions - common stuff                                            */
 287
 288 static int attach_inform(struct i2c_client *client)
 289 {
 290         struct bttv *btv = i2c_get_adapdata(client->adapter);
 291         int addr=ADDR_UNSET;
 292
 293
 294         if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr)
 295                 addr = bttv_tvcards[btv->c.type].tuner_addr;
 296
 297
 298         if (bttv_debug)
 299                 printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n",
 300                         btv->c.nr, client->driver->driver.name, client->addr,
 301                         client->name);
 302         if (!client->driver->command)
 303                 return 0;
 304
 305         if (btv->tuner_type != UNSET) {
 306                 struct tuner_setup tun_setup;
 307
 308                 if ((addr==ADDR_UNSET) ||
 309                                 (addr==client->addr)) {
 310
 311                         tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO;
 312                         tun_setup.type = btv->tuner_type;
 313                         tun_setup.addr = addr;
 314                         bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup);
 315                 }
 316
 317         }
 318
 319         return 0;
 320 }
 321
 322 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
 323 {
 324         if (0 != btv->i2c_rc)
 325                 return;
 326         i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
 327 }
 328
 329 static struct i2c_client bttv_i2c_client_template = {
 330         .name   = "bttv internal",
 331 };
 332
 333
 334 /* read I2C */
 335 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
 336 {
 337         unsigned char buffer = 0;
 338
 339         if (0 != btv->i2c_rc)
 340                 return -1;
 341         if (bttv_verbose && NULL != probe_for)
 342                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
 343                        btv->c.nr,probe_for,addr);
 344         btv->i2c_client.addr = addr >> 1;
 345         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
 346                 if (NULL != probe_for) {
 347                         if (bttv_verbose)
 348                                 printk("not found\n");
 349                 } else
 350                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
 351                                btv->c.nr,addr);
 352                 return -1;
 353         }
 354         if (bttv_verbose && NULL != probe_for)
 355                 printk("found\n");
 356         return buffer;
 357 }
 358
 359 /* write I2C */
 360 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
 361                     unsigned char b2, int both)
 362 {
 363         unsigned char buffer[2];
 364         int bytes = both ? 2 : 1;
 365
 366         if (0 != btv->i2c_rc)
 367                 return -1;
 368         btv->i2c_client.addr = addr >> 1;
 369         buffer[0] = b1;
 370         buffer[1] = b2;
 371         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
 372                 return -1;
 373         return 0;
 374 }
 375
 376 /* read EEPROM content */
 377 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
 378 {
 379         memset(eedata, 0, 256);
 380         if (0 != btv->i2c_rc)
 381                 return;
 382         btv->i2c_client.addr = addr >> 1;
 383         tveeprom_read(&btv->i2c_client, eedata, 256);
 384 }
 385
 386 static char *i2c_devs[128] = {
 387         [ 0x1c >> 1 ] = "lgdt330x",
 388         [ 0x30 >> 1 ] = "IR (hauppauge)",
 389         [ 0x80 >> 1 ] = "msp34xx",
 390         [ 0x86 >> 1 ] = "tda9887",
 391         [ 0xa0 >> 1 ] = "eeprom",
 392         [ 0xc0 >> 1 ] = "tuner (analog)",
 393         [ 0xc2 >> 1 ] = "tuner (analog)",
 394 };
 395
 396 static void do_i2c_scan(char *name, struct i2c_client *c)
 397 {
 398         unsigned char buf;
 399         int i,rc;
 400
 401         for (i = 0; i < 128; i++) {
 402                 c->addr = i;
 403                 rc = i2c_master_recv(c,&buf,0);
 404                 if (rc < 0)
 405                         continue;
 406                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 407                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 408         }
 409 }
 410
 411 /* init + register i2c algo-bit adapter */
 412 int __devinit init_bttv_i2c(struct bttv *btv)
 413 {
 414         memcpy(&btv->i2c_client, &bttv_i2c_client_template,
 415                sizeof(bttv_i2c_client_template));
 416
 417         if (i2c_hw)
 418                 btv->use_i2c_hw = 1;
 419         if (btv->use_i2c_hw) {
 420                 /* bt878 */
 421                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
 422                        sizeof(bttv_i2c_adap_hw_template));
 423         } else {
 424                 /* bt848 */
 425                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
 426                        sizeof(bttv_i2c_adap_sw_template));
 427                 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
 428                        sizeof(bttv_i2c_algo_bit_template));
 429                 btv->i2c_algo.data = btv;
 430                 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
 431         }
 432
 433         btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
 434         snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
 435                  "bt%d #%d [%s]", btv->id, btv->c.nr,
 436                  btv->use_i2c_hw ? "hw" : "sw");
 437
 438         i2c_set_adapdata(&btv->c.i2c_adap, btv);
 439         btv->i2c_client.adapter = &btv->c.i2c_adap;
 440
 441         if (bttv_tvcards[btv->c.type].no_video)
 442                 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
 443         if (bttv_tvcards[btv->c.type].has_dvb)
 444                 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
 445
 446         if (btv->use_i2c_hw) {
 447                 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
 448         } else {
 449                 bttv_bit_setscl(btv,1);
 450                 bttv_bit_setsda(btv,1);
 451                 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
 452         }
 453         if (0 == btv->i2c_rc && i2c_scan)
 454                 do_i2c_scan(btv->c.name,&btv->i2c_client);
 455         return btv->i2c_rc;
 456 }
 457
 458 int __devexit fini_bttv_i2c(struct bttv *btv)
 459 {
 460         if (0 != btv->i2c_rc)
 461                 return 0;
 462
 463         if (btv->use_i2c_hw) {
 464                 return i2c_del_adapter(&btv->c.i2c_adap);
 465         } else {
 466                 return i2c_bit_del_bus(&btv->c.i2c_adap);
 467         }
 468 }
 469
 470 /*
 471  * Local variables:
 472  * c-basic-offset: 8
 473  * End:
 474  */