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/moduleparam.h> 32#include <linux/init.h> 33#include <linux/delay.h> 34 35#include "bttvp.h" 36#include <media/v4l2-common.h> 37#include <linux/jiffies.h> 38#include <asm/io.h> 39 40static struct i2c_algo_bit_data bttv_i2c_algo_bit_template; 41static struct i2c_adapter bttv_i2c_adap_sw_template; 42static struct i2c_adapter bttv_i2c_adap_hw_template; 43static struct i2c_client bttv_i2c_client_template; 44 45static int attach_inform(struct i2c_client *client); 46 47static int i2c_debug; 48static int i2c_hw; 49static int i2c_scan; 50module_param(i2c_debug, int, 0644); 51MODULE_PARM_DESC(i2c_hw,"configure i2c debug level"); 52module_param(i2c_hw, int, 0444); 53MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, " 54 "instead of software bitbang"); 55module_param(i2c_scan, int, 0444); 56MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time"); 57 58static unsigned int i2c_udelay = 5; 59module_param(i2c_udelay, int, 0444); 60MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs " 61 "(should be 5 or higher). Lower value means higher bus speed."); 62 63/* ----------------------------------------------------------------------- */ 64/* I2C functions - bitbanging adapter (software i2c) */ 65 66static void bttv_bit_setscl(void *data, int state) 67{ 68 struct bttv *btv = (struct bttv*)data; 69 70 if (state) 71 btv->i2c_state |= 0x02; 72 else 73 btv->i2c_state &= ~0x02; 74 btwrite(btv->i2c_state, BT848_I2C); 75 btread(BT848_I2C); 76} 77 78static void bttv_bit_setsda(void *data, int state) 79{ 80 struct bttv *btv = (struct bttv*)data; 81 82 if (state) 83 btv->i2c_state |= 0x01; 84 else 85 btv->i2c_state &= ~0x01; 86 btwrite(btv->i2c_state, BT848_I2C); 87 btread(BT848_I2C); 88} 89 90static int bttv_bit_getscl(void *data) 91{ 92 struct bttv *btv = (struct bttv*)data; 93 int state; 94 95 state = btread(BT848_I2C) & 0x02 ? 1 : 0; 96 return state; 97} 98 99static int bttv_bit_getsda(void *data) 100{ 101 struct bttv *btv = (struct bttv*)data; 102 int state; 103 104 state = btread(BT848_I2C) & 0x01; 105 return state; 106} 107 108static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = { 109 .setsda = bttv_bit_setsda, 110 .setscl = bttv_bit_setscl, 111 .getsda = bttv_bit_getsda, 112 .getscl = bttv_bit_getscl, 113 .udelay = 16, 114 .timeout = 200, 115}; 116 117static struct i2c_adapter bttv_i2c_adap_sw_template = { 118 .owner = THIS_MODULE, 119 .class = I2C_CLASS_TV_ANALOG, 120 .name = "bttv", 121 .id = I2C_HW_B_BT848, 122 .client_register = attach_inform, 123}; 124 125/* ----------------------------------------------------------------------- */ 126/* I2C functions - hardware i2c */ 127 128static int algo_control(struct i2c_adapter *adapter, 129 unsigned int cmd, unsigned long arg) 130{ 131 return 0; 132} 133 134static u32 functionality(struct i2c_adapter *adap) 135{ 136 return I2C_FUNC_SMBUS_EMUL; 137} 138 139static int 140bttv_i2c_wait_done(struct bttv *btv) 141{ 142 int rc = 0; 143 144 /* timeout */ 145 if (wait_event_interruptible_timeout(btv->i2c_queue, 146 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS) 147 148 rc = -EIO; 149 150 if (btv->i2c_done & BT848_INT_RACK) 151 rc = 1; 152 btv->i2c_done = 0; 153 return rc; 154} 155 156#define I2C_HW (BT878_I2C_MODE | BT848_I2C_SYNC |\ 157 BT848_I2C_SCL | BT848_I2C_SDA) 158 159static int 160bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last) 161{ 162 u32 xmit; 163 int retval,cnt; 164 165 /* sanity checks */ 166 if (0 == msg->len) 167 return -EINVAL; 168 169 /* start, address + first byte */ 170 xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW; 171 if (msg->len > 1 || !last) 172 xmit |= BT878_I2C_NOSTOP; 173 btwrite(xmit, BT848_I2C); 174 retval = bttv_i2c_wait_done(btv); 175 if (retval < 0) 176 goto err; 177 if (retval == 0) 178 goto eio; 179 if (i2c_debug) { 180 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]); 181 if (!(xmit & BT878_I2C_NOSTOP)) 182 printk(" >\n"); 183 } 184 185 for (cnt = 1; cnt < msg->len; cnt++ ) { 186 /* following bytes */ 187 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART; 188 if (cnt < msg->len-1 || !last) 189 xmit |= BT878_I2C_NOSTOP; 190 btwrite(xmit, BT848_I2C); 191 retval = bttv_i2c_wait_done(btv); 192 if (retval < 0) 193 goto err; 194 if (retval == 0) 195 goto eio; 196 if (i2c_debug) { 197 printk(" %02x", msg->buf[cnt]); 198 if (!(xmit & BT878_I2C_NOSTOP)) 199 printk(" >\n"); 200 } 201 } 202 return msg->len; 203 204 eio: 205 retval = -EIO; 206 err: 207 if (i2c_debug) 208 printk(" ERR: %d\n",retval); 209 return retval; 210} 211 212static int 213bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last) 214{ 215 u32 xmit; 216 u32 cnt; 217 int retval; 218 219 for(cnt = 0; cnt < msg->len; cnt++) { 220 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW; 221 if (cnt < msg->len-1) 222 xmit |= BT848_I2C_W3B; 223 if (cnt < msg->len-1 || !last) 224 xmit |= BT878_I2C_NOSTOP; 225 if (cnt) 226 xmit |= BT878_I2C_NOSTART; 227 btwrite(xmit, BT848_I2C); 228 retval = bttv_i2c_wait_done(btv); 229 if (retval < 0) 230 goto err; 231 if (retval == 0) 232 goto eio; 233 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff; 234 if (i2c_debug) { 235 if (!(xmit & BT878_I2C_NOSTART)) 236 printk(" <R %02x", (msg->addr << 1) +1); 237 printk(" =%02x", msg->buf[cnt]); 238 if (!(xmit & BT878_I2C_NOSTOP)) 239 printk(" >\n"); 240 } 241 } 242 return msg->len; 243 244 eio: 245 retval = -EIO; 246 err: 247 if (i2c_debug) 248 printk(" ERR: %d\n",retval); 249 return retval; 250} 251 252static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) 253{ 254 struct bttv *btv = i2c_get_adapdata(i2c_adap); 255 int retval = 0; 256 int i; 257 258 if (i2c_debug) 259 printk("bt-i2c:"); 260 btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT); 261 for (i = 0 ; i < num; i++) { 262 if (msgs[i].flags & I2C_M_RD) { 263 /* read */ 264 retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num); 265 if (retval < 0) 266 goto err; 267 } else { 268 /* write */ 269 retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num); 270 if (retval < 0) 271 goto err; 272 } 273 } 274 return num; 275 276 err: 277 return retval; 278} 279 280static struct i2c_algorithm bttv_algo = { 281 .master_xfer = bttv_i2c_xfer, 282 .algo_control = algo_control, 283 .functionality = functionality, 284}; 285 286static struct i2c_adapter bttv_i2c_adap_hw_template = { 287 .owner = THIS_MODULE, 288 .class = I2C_CLASS_TV_ANALOG, 289 .name = "bt878", 290 .id = I2C_HW_B_BT848, 291 .algo = &bttv_algo, 292 .client_register = attach_inform, 293}; 294 295/* ----------------------------------------------------------------------- */ 296/* I2C functions - common stuff */ 297 298static int attach_inform(struct i2c_client *client) 299{ 300 struct bttv *btv = i2c_get_adapdata(client->adapter); 301 int addr=ADDR_UNSET; 302 303 304 if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr) 305 addr = bttv_tvcards[btv->c.type].tuner_addr; 306 307 308 if (bttv_debug) 309 printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n", 310 btv->c.nr, client->driver->driver.name, client->addr, 311 client->name); 312 if (!client->driver->command) 313 return 0; 314 315 if (client->driver->id == I2C_DRIVERID_MSP3400) 316 btv->i2c_msp34xx_client = client; 317 if (client->driver->id == I2C_DRIVERID_TVAUDIO) 318 btv->i2c_tvaudio_client = client; 319 if (btv->tuner_type != UNSET) { 320 struct tuner_setup tun_setup; 321 322 if ((addr==ADDR_UNSET) || 323 (addr==client->addr)) { 324 325 tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO; 326 tun_setup.type = btv->tuner_type; 327 tun_setup.addr = addr; 328 bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup); 329 } 330 331 } 332 333 return 0; 334} 335 336void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg) 337{ 338 if (0 != btv->i2c_rc) 339 return; 340 i2c_clients_command(&btv->c.i2c_adap, cmd, arg); 341} 342 343static struct i2c_client bttv_i2c_client_template = { 344 .name = "bttv internal", 345}; 346 347 348/* read I2C */ 349int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for) 350{ 351 unsigned char buffer = 0; 352 353 if (0 != btv->i2c_rc) 354 return -1; 355 if (bttv_verbose && NULL != probe_for) 356 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ", 357 btv->c.nr,probe_for,addr); 358 btv->i2c_client.addr = addr >> 1; 359 if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) { 360 if (NULL != probe_for) { 361 if (bttv_verbose) 362 printk("not found\n"); 363 } else 364 printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n", 365 btv->c.nr,addr); 366 return -1; 367 } 368 if (bttv_verbose && NULL != probe_for) 369 printk("found\n"); 370 return buffer; 371} 372 373/* write I2C */ 374int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1, 375 unsigned char b2, int both) 376{ 377 unsigned char buffer[2]; 378 int bytes = both ? 2 : 1; 379 380 if (0 != btv->i2c_rc) 381 return -1; 382 btv->i2c_client.addr = addr >> 1; 383 buffer[0] = b1; 384 buffer[1] = b2; 385 if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes)) 386 return -1; 387 return 0; 388} 389 390/* read EEPROM content */ 391void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr) 392{ 393 memset(eedata, 0, 256); 394 if (0 != btv->i2c_rc) 395 return; 396 btv->i2c_client.addr = addr >> 1; 397 tveeprom_read(&btv->i2c_client, eedata, 256); 398} 399 400static char *i2c_devs[128] = { 401 [ 0x1c >> 1 ] = "lgdt330x", 402 [ 0x30 >> 1 ] = "IR (hauppauge)", 403 [ 0x80 >> 1 ] = "msp34xx", 404 [ 0x86 >> 1 ] = "tda9887", 405 [ 0xa0 >> 1 ] = "eeprom", 406 [ 0xc0 >> 1 ] = "tuner (analog)", 407 [ 0xc2 >> 1 ] = "tuner (analog)", 408}; 409 410static void do_i2c_scan(char *name, struct i2c_client *c) 411{ 412 unsigned char buf; 413 int i,rc; 414 415 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { 416 c->addr = i; 417 rc = i2c_master_recv(c,&buf,0); 418 if (rc < 0) 419 continue; 420 printk("%s: i2c scan: found device @ 0x%x [%s]\n", 421 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); 422 } 423} 424 425/* init + register i2c algo-bit adapter */ 426int __devinit init_bttv_i2c(struct bttv *btv) 427{ 428 memcpy(&btv->i2c_client, &bttv_i2c_client_template, 429 sizeof(bttv_i2c_client_template)); 430 431 if (i2c_hw) 432 btv->use_i2c_hw = 1; 433 if (btv->use_i2c_hw) { 434 /* bt878 */ 435 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template, 436 sizeof(bttv_i2c_adap_hw_template)); 437 } else { 438 /* bt848 */ 439 /* Prevents usage of invalid delay values */ 440 if (i2c_udelay<5) 441 i2c_udelay=5; 442 bttv_i2c_algo_bit_template.udelay=i2c_udelay; 443 444 memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template, 445 sizeof(bttv_i2c_adap_sw_template)); 446 memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template, 447 sizeof(bttv_i2c_algo_bit_template)); 448 btv->i2c_algo.data = btv; 449 btv->c.i2c_adap.algo_data = &btv->i2c_algo; 450 } 451 452 btv->c.i2c_adap.dev.parent = &btv->c.pci->dev; 453 snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name), 454 "bt%d #%d [%s]", btv->id, btv->c.nr, 455 btv->use_i2c_hw ? "hw" : "sw"); 456 457 i2c_set_adapdata(&btv->c.i2c_adap, btv); 458 btv->i2c_client.adapter = &btv->c.i2c_adap; 459 460 if (bttv_tvcards[btv->c.type].no_video) 461 btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG; 462 if (bttv_tvcards[btv->c.type].has_dvb) 463 btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL; 464 465 if (btv->use_i2c_hw) { 466 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap); 467 } else { 468 bttv_bit_setscl(btv,1); 469 bttv_bit_setsda(btv,1); 470 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap); 471 } 472 if (0 == btv->i2c_rc && i2c_scan) 473 do_i2c_scan(btv->c.name,&btv->i2c_client); 474 return btv->i2c_rc; 475} 476 477int __devexit fini_bttv_i2c(struct bttv *btv) 478{ 479 if (0 != btv->i2c_rc) 480 return 0; 481 482 return i2c_del_adapter(&btv->c.i2c_adap); 483} 484 485/* 486 * Local variables: 487 * c-basic-offset: 8 488 * End: 489 */ 490