drivers/media/video/bttv-i2c.c

   1 /*
   2     $Id: bttv-i2c.c,v 1.18 2005/02/16 12:14:10 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/moduleparam.h>
  30 #include <linux/init.h>
  31 #include <linux/delay.h>
  32 #include <linux/jiffies.h>
  33 #include <asm/io.h>
  34
  35 #include "bttvp.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 #ifdef I2C_CLASS_TV_ANALOG
 110         .class             = I2C_CLASS_TV_ANALOG,
 111 #endif
 112         I2C_DEVNAME("bt848"),
 113         .id                = I2C_HW_B_BT848,
 114         .client_register   = attach_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         int rc = 0;
 135
 136         /* timeout */
 137         if (wait_event_interruptible_timeout(btv->i2c_queue,
 138                 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
 139
 140         rc = -EIO;
 141
 142         if (btv->i2c_done & BT848_INT_RACK)
 143                 rc = 1;
 144         btv->i2c_done = 0;
 145         return rc;
 146 }
 147
 148 #define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
 149                 BT848_I2C_SCL | BT848_I2C_SDA)
 150
 151 static int
 152 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 153 {
 154         u32 xmit;
 155         int retval,cnt;
 156
 157         /* sanity checks */
 158         if (0 == msg->len)
 159                 return -EINVAL;
 160
 161         /* start, address + first byte */
 162         xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
 163         if (msg->len > 1 || !last)
 164                 xmit |= BT878_I2C_NOSTOP;
 165         btwrite(xmit, BT848_I2C);
 166         retval = bttv_i2c_wait_done(btv);
 167         if (retval < 0)
 168                 goto err;
 169         if (retval == 0)
 170                 goto eio;
 171         if (i2c_debug) {
 172                 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
 173                 if (!(xmit & BT878_I2C_NOSTOP))
 174                         printk(" >\n");
 175         }
 176
 177         for (cnt = 1; cnt < msg->len; cnt++ ) {
 178                 /* following bytes */
 179                 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
 180                 if (cnt < msg->len-1 || !last)
 181                         xmit |= BT878_I2C_NOSTOP;
 182                 btwrite(xmit, BT848_I2C);
 183                 retval = bttv_i2c_wait_done(btv);
 184                 if (retval < 0)
 185                         goto err;
 186                 if (retval == 0)
 187                         goto eio;
 188                 if (i2c_debug) {
 189                         printk(" %02x", msg->buf[cnt]);
 190                         if (!(xmit & BT878_I2C_NOSTOP))
 191                                 printk(" >\n");
 192                 }
 193         }
 194         return msg->len;
 195
 196  eio:
 197         retval = -EIO;
 198  err:
 199         if (i2c_debug)
 200                 printk(" ERR: %d\n",retval);
 201         return retval;
 202 }
 203
 204 static int
 205 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 206 {
 207         u32 xmit;
 208         u32 cnt;
 209         int retval;
 210
 211         for(cnt = 0; cnt < msg->len; cnt++) {
 212                 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
 213                 if (cnt < msg->len-1)
 214                         xmit |= BT848_I2C_W3B;
 215                 if (cnt < msg->len-1 || !last)
 216                         xmit |= BT878_I2C_NOSTOP;
 217                 if (cnt)
 218                         xmit |= BT878_I2C_NOSTART;
 219                 btwrite(xmit, BT848_I2C);
 220                 retval = bttv_i2c_wait_done(btv);
 221                 if (retval < 0)
 222                         goto err;
 223                 if (retval == 0)
 224                         goto eio;
 225                 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
 226                 if (i2c_debug) {
 227                         if (!(xmit & BT878_I2C_NOSTART))
 228                                 printk(" <R %02x", (msg->addr << 1) +1);
 229                         printk(" =%02x", msg->buf[cnt]);
 230                         if (!(xmit & BT878_I2C_NOSTOP))
 231                                 printk(" >\n");
 232                 }
 233         }
 234         return msg->len;
 235
 236  eio:
 237         retval = -EIO;
 238  err:
 239         if (i2c_debug)
 240                 printk(" ERR: %d\n",retval);
 241         return retval;
 242 }
 243
 244 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
 245 {
 246         struct bttv *btv = i2c_get_adapdata(i2c_adap);
 247         int retval = 0;
 248         int i;
 249
 250         if (i2c_debug)
 251                 printk("bt-i2c:");
 252         btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
 253         for (i = 0 ; i < num; i++) {
 254                 if (msgs[i].flags & I2C_M_RD) {
 255                         /* read */
 256                         retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
 257                         if (retval < 0)
 258                                 goto err;
 259                 } else {
 260                         /* write */
 261                         retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
 262                         if (retval < 0)
 263                                 goto err;
 264                 }
 265         }
 266         return num;
 267
 268  err:
 269         return retval;
 270 }
 271
 272 static struct i2c_algorithm bttv_algo = {
 273         .name          = "bt878",
 274         .id            = I2C_ALGO_BIT | I2C_HW_B_BT848 /* FIXME */,
 275         .master_xfer   = bttv_i2c_xfer,
 276         .algo_control  = algo_control,
 277         .functionality = functionality,
 278 };
 279
 280 static struct i2c_adapter bttv_i2c_adap_hw_template = {
 281         .owner         = THIS_MODULE,
 282 #ifdef I2C_CLASS_TV_ANALOG
 283         .class         = I2C_CLASS_TV_ANALOG,
 284 #endif
 285         I2C_DEVNAME("bt878"),
 286         .id            = I2C_ALGO_BIT | I2C_HW_B_BT848 /* FIXME */,
 287         .algo          = &bttv_algo,
 288         .client_register = attach_inform,
 289 };
 290
 291 /* ----------------------------------------------------------------------- */
 292 /* I2C functions - common stuff                                            */
 293
 294 static int attach_inform(struct i2c_client *client)
 295 {
 296         struct bttv *btv = i2c_get_adapdata(client->adapter);
 297
 298         if (btv->tuner_type != UNSET)
 299                 bttv_call_i2c_clients(btv,TUNER_SET_TYPE,&btv->tuner_type);
 300         if (btv->pinnacle_id != UNSET)
 301                 bttv_call_i2c_clients(btv,AUDC_CONFIG_PINNACLE,
 302                                       &btv->pinnacle_id);
 303         if (bttv_debug)
 304                 printk("bttv%d: i2c attach [client=%s]\n",
 305                        btv->c.nr, i2c_clientname(client));
 306         return 0;
 307 }
 308
 309 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
 310 {
 311         if (0 != btv->i2c_rc)
 312                 return;
 313         i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
 314 }
 315
 316 static struct i2c_client bttv_i2c_client_template = {
 317         I2C_DEVNAME("bttv internal"),
 318 };
 319
 320
 321 /* read I2C */
 322 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
 323 {
 324         unsigned char buffer = 0;
 325
 326         if (0 != btv->i2c_rc)
 327                 return -1;
 328         if (bttv_verbose && NULL != probe_for)
 329                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
 330                        btv->c.nr,probe_for,addr);
 331         btv->i2c_client.addr = addr >> 1;
 332         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
 333                 if (NULL != probe_for) {
 334                         if (bttv_verbose)
 335                                 printk("not found\n");
 336                 } else
 337                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
 338                                btv->c.nr,addr);
 339                 return -1;
 340         }
 341         if (bttv_verbose && NULL != probe_for)
 342                 printk("found\n");
 343         return buffer;
 344 }
 345
 346 /* write I2C */
 347 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
 348                     unsigned char b2, int both)
 349 {
 350         unsigned char buffer[2];
 351         int bytes = both ? 2 : 1;
 352
 353         if (0 != btv->i2c_rc)
 354                 return -1;
 355         btv->i2c_client.addr = addr >> 1;
 356         buffer[0] = b1;
 357         buffer[1] = b2;
 358         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
 359                 return -1;
 360         return 0;
 361 }
 362
 363 /* read EEPROM content */
 364 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
 365 {
 366         btv->i2c_client.addr = addr >> 1;
 367         tveeprom_read(&btv->i2c_client, eedata, 256);
 368 }
 369
 370 static char *i2c_devs[128] = {
 371         [ 0x30 >> 1 ] = "IR (hauppauge)",
 372         [ 0x80 >> 1 ] = "msp34xx",
 373         [ 0x86 >> 1 ] = "tda9887",
 374         [ 0xa0 >> 1 ] = "eeprom",
 375         [ 0xc0 >> 1 ] = "tuner (analog)",
 376         [ 0xc2 >> 1 ] = "tuner (analog)",
 377 };
 378
 379 static void do_i2c_scan(char *name, struct i2c_client *c)
 380 {
 381         unsigned char buf;
 382         int i,rc;
 383
 384         for (i = 0; i < 128; i++) {
 385                 c->addr = i;
 386                 rc = i2c_master_recv(c,&buf,0);
 387                 if (rc < 0)
 388                         continue;
 389                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 390                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 391         }
 392 }
 393
 394 /* init + register i2c algo-bit adapter */
 395 int __devinit init_bttv_i2c(struct bttv *btv)
 396 {
 397         memcpy(&btv->i2c_client, &bttv_i2c_client_template,
 398                sizeof(bttv_i2c_client_template));
 399
 400         if (i2c_hw)
 401                 btv->use_i2c_hw = 1;
 402         if (btv->use_i2c_hw) {
 403                 /* bt878 */
 404                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template,
 405                        sizeof(bttv_i2c_adap_hw_template));
 406         } else {
 407                 /* bt848 */
 408                 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
 409                        sizeof(bttv_i2c_adap_sw_template));
 410                 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
 411                        sizeof(bttv_i2c_algo_bit_template));
 412                 btv->i2c_algo.data = btv;
 413                 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
 414         }
 415
 416         btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
 417         snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
 418                  "bt%d #%d [%s]", btv->id, btv->c.nr,
 419                  btv->use_i2c_hw ? "hw" : "sw");
 420
 421         i2c_set_adapdata(&btv->c.i2c_adap, btv);
 422         btv->i2c_client.adapter = &btv->c.i2c_adap;
 423
 424 #ifdef I2C_CLASS_TV_ANALOG
 425         if (bttv_tvcards[btv->c.type].no_video)
 426                 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
 427         if (bttv_tvcards[btv->c.type].has_dvb)
 428                 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
 429 #endif
 430
 431         if (btv->use_i2c_hw) {
 432                 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
 433         } else {
 434                 bttv_bit_setscl(btv,1);
 435                 bttv_bit_setsda(btv,1);
 436                 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
 437         }
 438         if (0 == btv->i2c_rc && i2c_scan)
 439                 do_i2c_scan(btv->c.name,&btv->i2c_client);
 440         return btv->i2c_rc;
 441 }
 442
 443 int __devexit fini_bttv_i2c(struct bttv *btv)
 444 {
 445         if (0 != btv->i2c_rc)
 446                 return 0;
 447
 448         if (btv->use_i2c_hw) {
 449                 return i2c_del_adapter(&btv->c.i2c_adap);
 450         } else {
 451                 return i2c_bit_del_bus(&btv->c.i2c_adap);
 452         }
 453 }
 454
 455 /*
 456  * Local variables:
 457  * c-basic-offset: 8
 458  * End:
 459  */