drivers/media/video/bt8xx/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     (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
  12         - Multituner support and i2c address binding
  13
  14     This program is free software; you can redistribute it and/or modify
  15     it under the terms of the GNU General Public License as published by
  16     the Free Software Foundation; either version 2 of the License, or
  17     (at your option) any later version.
  18
  19     This program is distributed in the hope that it will be useful,
  20     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22     GNU General Public License for more details.
  23
  24     You should have received a copy of the GNU General Public License
  25     along with this program; if not, write to the Free Software
  26     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27
  28 */
  29
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/delay.h>
  33
  34 #include "bttvp.h"
  35 #include <media/v4l2-common.h>
  36 #include <linux/jiffies.h>
  37 #include <asm/io.h>
  38
  39 static int attach_inform(struct i2c_client *client);
  40
  41 static int i2c_debug;
  42 static int i2c_hw;
  43 static int i2c_scan;
  44 module_param(i2c_debug, int, 0644);
  45 MODULE_PARM_DESC(i2c_hw,"configure i2c debug level");
  46 module_param(i2c_hw,    int, 0444);
  47 MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
  48                         "instead of software bitbang");
  49 module_param(i2c_scan,  int, 0444);
  50 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
  51
  52 static unsigned int i2c_udelay = 5;
  53 module_param(i2c_udelay, int, 0444);
  54 MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
  55                 "(should be 5 or higher). Lower value means higher bus speed.");
  56
  57 /* ----------------------------------------------------------------------- */
  58 /* I2C functions - bitbanging adapter (software i2c)                       */
  59
  60 static void bttv_bit_setscl(void *data, int state)
  61 {
  62         struct bttv *btv = (struct bttv*)data;
  63
  64         if (state)
  65                 btv->i2c_state |= 0x02;
  66         else
  67                 btv->i2c_state &= ~0x02;
  68         btwrite(btv->i2c_state, BT848_I2C);
  69         btread(BT848_I2C);
  70 }
  71
  72 static void bttv_bit_setsda(void *data, int state)
  73 {
  74         struct bttv *btv = (struct bttv*)data;
  75
  76         if (state)
  77                 btv->i2c_state |= 0x01;
  78         else
  79                 btv->i2c_state &= ~0x01;
  80         btwrite(btv->i2c_state, BT848_I2C);
  81         btread(BT848_I2C);
  82 }
  83
  84 static int bttv_bit_getscl(void *data)
  85 {
  86         struct bttv *btv = (struct bttv*)data;
  87         int state;
  88
  89         state = btread(BT848_I2C) & 0x02 ? 1 : 0;
  90         return state;
  91 }
  92
  93 static int bttv_bit_getsda(void *data)
  94 {
  95         struct bttv *btv = (struct bttv*)data;
  96         int state;
  97
  98         state = btread(BT848_I2C) & 0x01;
  99         return state;
 100 }
 101
 102 static struct i2c_algo_bit_data __devinitdata bttv_i2c_algo_bit_template = {
 103         .setsda  = bttv_bit_setsda,
 104         .setscl  = bttv_bit_setscl,
 105         .getsda  = bttv_bit_getsda,
 106         .getscl  = bttv_bit_getscl,
 107         .udelay  = 16,
 108         .timeout = 200,
 109 };
 110
 111 /* ----------------------------------------------------------------------- */
 112 /* I2C functions - hardware i2c                                            */
 113
 114 static u32 functionality(struct i2c_adapter *adap)
 115 {
 116         return I2C_FUNC_SMBUS_EMUL;
 117 }
 118
 119 static int
 120 bttv_i2c_wait_done(struct bttv *btv)
 121 {
 122         int rc = 0;
 123
 124         /* timeout */
 125         if (wait_event_interruptible_timeout(btv->i2c_queue,
 126                 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
 127
 128         rc = -EIO;
 129
 130         if (btv->i2c_done & BT848_INT_RACK)
 131                 rc = 1;
 132         btv->i2c_done = 0;
 133         return rc;
 134 }
 135
 136 #define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
 137                 BT848_I2C_SCL | BT848_I2C_SDA)
 138
 139 static int
 140 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 141 {
 142         u32 xmit;
 143         int retval,cnt;
 144
 145         /* sanity checks */
 146         if (0 == msg->len)
 147                 return -EINVAL;
 148
 149         /* start, address + first byte */
 150         xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
 151         if (msg->len > 1 || !last)
 152                 xmit |= BT878_I2C_NOSTOP;
 153         btwrite(xmit, BT848_I2C);
 154         retval = bttv_i2c_wait_done(btv);
 155         if (retval < 0)
 156                 goto err;
 157         if (retval == 0)
 158                 goto eio;
 159         if (i2c_debug) {
 160                 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
 161                 if (!(xmit & BT878_I2C_NOSTOP))
 162                         printk(" >\n");
 163         }
 164
 165         for (cnt = 1; cnt < msg->len; cnt++ ) {
 166                 /* following bytes */
 167                 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
 168                 if (cnt < msg->len-1 || !last)
 169                         xmit |= BT878_I2C_NOSTOP;
 170                 btwrite(xmit, BT848_I2C);
 171                 retval = bttv_i2c_wait_done(btv);
 172                 if (retval < 0)
 173                         goto err;
 174                 if (retval == 0)
 175                         goto eio;
 176                 if (i2c_debug) {
 177                         printk(" %02x", msg->buf[cnt]);
 178                         if (!(xmit & BT878_I2C_NOSTOP))
 179                                 printk(" >\n");
 180                 }
 181         }
 182         return msg->len;
 183
 184  eio:
 185         retval = -EIO;
 186  err:
 187         if (i2c_debug)
 188                 printk(" ERR: %d\n",retval);
 189         return retval;
 190 }
 191
 192 static int
 193 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
 194 {
 195         u32 xmit;
 196         u32 cnt;
 197         int retval;
 198
 199         for(cnt = 0; cnt < msg->len; cnt++) {
 200                 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
 201                 if (cnt < msg->len-1)
 202                         xmit |= BT848_I2C_W3B;
 203                 if (cnt < msg->len-1 || !last)
 204                         xmit |= BT878_I2C_NOSTOP;
 205                 if (cnt)
 206                         xmit |= BT878_I2C_NOSTART;
 207                 btwrite(xmit, BT848_I2C);
 208                 retval = bttv_i2c_wait_done(btv);
 209                 if (retval < 0)
 210                         goto err;
 211                 if (retval == 0)
 212                         goto eio;
 213                 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
 214                 if (i2c_debug) {
 215                         if (!(xmit & BT878_I2C_NOSTART))
 216                                 printk(" <R %02x", (msg->addr << 1) +1);
 217                         printk(" =%02x", msg->buf[cnt]);
 218                         if (!(xmit & BT878_I2C_NOSTOP))
 219                                 printk(" >\n");
 220                 }
 221         }
 222         return msg->len;
 223
 224  eio:
 225         retval = -EIO;
 226  err:
 227         if (i2c_debug)
 228                 printk(" ERR: %d\n",retval);
 229         return retval;
 230 }
 231
 232 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
 233 {
 234         struct bttv *btv = i2c_get_adapdata(i2c_adap);
 235         int retval = 0;
 236         int i;
 237
 238         if (i2c_debug)
 239                 printk("bt-i2c:");
 240         btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
 241         for (i = 0 ; i < num; i++) {
 242                 if (msgs[i].flags & I2C_M_RD) {
 243                         /* read */
 244                         retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
 245                         if (retval < 0)
 246                                 goto err;
 247                 } else {
 248                         /* write */
 249                         retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
 250                         if (retval < 0)
 251                                 goto err;
 252                 }
 253         }
 254         return num;
 255
 256  err:
 257         return retval;
 258 }
 259
 260 static const struct i2c_algorithm bttv_algo = {
 261         .master_xfer   = bttv_i2c_xfer,
 262         .functionality = functionality,
 263 };
 264
 265 /* ----------------------------------------------------------------------- */
 266 /* I2C functions - common stuff                                            */
 267
 268 static int attach_inform(struct i2c_client *client)
 269 {
 270         struct bttv *btv = i2c_get_adapdata(client->adapter);
 271         int addr=ADDR_UNSET;
 272
 273
 274         if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr)
 275                 addr = bttv_tvcards[btv->c.type].tuner_addr;
 276
 277
 278         if (bttv_debug)
 279                 printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n",
 280                         btv->c.nr, client->driver->driver.name, client->addr,
 281                         client->name);
 282         if (!client->driver->command)
 283                 return 0;
 284
 285         if (client->driver->id == I2C_DRIVERID_MSP3400)
 286                 btv->i2c_msp34xx_client = client;
 287         if (client->driver->id == I2C_DRIVERID_TVAUDIO)
 288                 btv->i2c_tvaudio_client = client;
 289         if (btv->tuner_type != UNSET) {
 290                 struct tuner_setup tun_setup;
 291
 292                 if ((addr==ADDR_UNSET) ||
 293                                 (addr==client->addr)) {
 294
 295                         tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO;
 296                         tun_setup.type = btv->tuner_type;
 297                         tun_setup.addr = addr;
 298                         bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup);
 299                 }
 300
 301         }
 302
 303         return 0;
 304 }
 305
 306 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
 307 {
 308         if (0 != btv->i2c_rc)
 309                 return;
 310         i2c_clients_command(&btv->c.i2c_adap, cmd, arg);
 311 }
 312
 313
 314 /* read I2C */
 315 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
 316 {
 317         unsigned char buffer = 0;
 318
 319         if (0 != btv->i2c_rc)
 320                 return -1;
 321         if (bttv_verbose && NULL != probe_for)
 322                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
 323                        btv->c.nr,probe_for,addr);
 324         btv->i2c_client.addr = addr >> 1;
 325         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
 326                 if (NULL != probe_for) {
 327                         if (bttv_verbose)
 328                                 printk("not found\n");
 329                 } else
 330                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
 331                                btv->c.nr,addr);
 332                 return -1;
 333         }
 334         if (bttv_verbose && NULL != probe_for)
 335                 printk("found\n");
 336         return buffer;
 337 }
 338
 339 /* write I2C */
 340 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
 341                     unsigned char b2, int both)
 342 {
 343         unsigned char buffer[2];
 344         int bytes = both ? 2 : 1;
 345
 346         if (0 != btv->i2c_rc)
 347                 return -1;
 348         btv->i2c_client.addr = addr >> 1;
 349         buffer[0] = b1;
 350         buffer[1] = b2;
 351         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
 352                 return -1;
 353         return 0;
 354 }
 355
 356 /* read EEPROM content */
 357 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
 358 {
 359         memset(eedata, 0, 256);
 360         if (0 != btv->i2c_rc)
 361                 return;
 362         btv->i2c_client.addr = addr >> 1;
 363         tveeprom_read(&btv->i2c_client, eedata, 256);
 364 }
 365
 366 static char *i2c_devs[128] = {
 367         [ 0x1c >> 1 ] = "lgdt330x",
 368         [ 0x30 >> 1 ] = "IR (hauppauge)",
 369         [ 0x80 >> 1 ] = "msp34xx",
 370         [ 0x86 >> 1 ] = "tda9887",
 371         [ 0xa0 >> 1 ] = "eeprom",
 372         [ 0xc0 >> 1 ] = "tuner (analog)",
 373         [ 0xc2 >> 1 ] = "tuner (analog)",
 374 };
 375
 376 static void do_i2c_scan(char *name, struct i2c_client *c)
 377 {
 378         unsigned char buf;
 379         int i,rc;
 380
 381         for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 382                 c->addr = i;
 383                 rc = i2c_master_recv(c,&buf,0);
 384                 if (rc < 0)
 385                         continue;
 386                 printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 387                        name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 388         }
 389 }
 390
 391 /* init + register i2c algo-bit adapter */
 392 int __devinit init_bttv_i2c(struct bttv *btv)
 393 {
 394         strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE);
 395
 396         if (i2c_hw)
 397                 btv->use_i2c_hw = 1;
 398         if (btv->use_i2c_hw) {
 399                 /* bt878 */
 400                 strlcpy(btv->c.i2c_adap.name, "bt878",
 401                         sizeof(btv->c.i2c_adap.name));
 402                 btv->c.i2c_adap.id = I2C_HW_B_BT848;    /* FIXME */
 403                 btv->c.i2c_adap.algo = &bttv_algo;
 404         } else {
 405                 /* bt848 */
 406         /* Prevents usage of invalid delay values */
 407                 if (i2c_udelay<5)
 408                         i2c_udelay=5;
 409
 410                 strlcpy(btv->c.i2c_adap.name, "bttv",
 411                         sizeof(btv->c.i2c_adap.name));
 412                 btv->c.i2c_adap.id = I2C_HW_B_BT848;
 413                 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
 414                        sizeof(bttv_i2c_algo_bit_template));
 415                 btv->i2c_algo.udelay = i2c_udelay;
 416                 btv->i2c_algo.data = btv;
 417                 btv->c.i2c_adap.algo_data = &btv->i2c_algo;
 418         }
 419         btv->c.i2c_adap.owner = THIS_MODULE;
 420         btv->c.i2c_adap.class = I2C_CLASS_TV_ANALOG;
 421         btv->c.i2c_adap.client_register = attach_inform;
 422
 423         btv->c.i2c_adap.dev.parent = &btv->c.pci->dev;
 424         snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name),
 425                  "bt%d #%d [%s]", btv->id, btv->c.nr,
 426                  btv->use_i2c_hw ? "hw" : "sw");
 427
 428         i2c_set_adapdata(&btv->c.i2c_adap, btv);
 429         btv->i2c_client.adapter = &btv->c.i2c_adap;
 430
 431         if (bttv_tvcards[btv->c.type].no_video)
 432                 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG;
 433         if (bttv_tvcards[btv->c.type].has_dvb)
 434                 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
 435
 436         if (btv->use_i2c_hw) {
 437                 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap);
 438         } else {
 439                 bttv_bit_setscl(btv,1);
 440                 bttv_bit_setsda(btv,1);
 441                 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap);
 442         }
 443         if (0 == btv->i2c_rc && i2c_scan)
 444                 do_i2c_scan(btv->c.name,&btv->i2c_client);
 445         return btv->i2c_rc;
 446 }
 447
 448 int __devexit fini_bttv_i2c(struct bttv *btv)
 449 {
 450         if (0 != btv->i2c_rc)
 451                 return 0;
 452
 453         return i2c_del_adapter(&btv->c.i2c_adap);
 454 }
 455
 456 /*
 457  * Local variables:
 458  * c-basic-offset: 8
 459  * End:
 460  */