1 /* 2 cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices 3 4 Copyright (C) 2008 <srinivasa.deevi at conexant dot com> 5 Based on em28xx driver 6 Based on Cx23885 driver 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 23 #include "cx231xx.h" 24 #include <linux/module.h> 25 #include <linux/kernel.h> 26 #include <linux/i2c.h> 27 #include <linux/i2c-mux.h> 28 #include <media/v4l2-common.h> 29 #include <media/tuner.h> 30 31 32 /* ----------------------------------------------------------- */ 33 34 static unsigned int i2c_scan; 35 module_param(i2c_scan, int, 0444); 36 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); 37 38 static unsigned int i2c_debug; 39 module_param(i2c_debug, int, 0644); 40 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); 41 42 #define dprintk1(lvl, fmt, args...) \ 43 do { \ 44 if (i2c_debug >= lvl) { \ 45 printk(fmt, ##args); \ 46 } \ 47 } while (0) 48 49 #define dprintk2(lvl, fmt, args...) \ 50 do { \ 51 if (i2c_debug >= lvl) { \ 52 printk(KERN_DEBUG "%s at %s: " fmt, \ 53 dev->name, __func__ , ##args); \ 54 } \ 55 } while (0) 56 57 static inline int get_real_i2c_port(struct cx231xx *dev, int bus_nr) 58 { 59 if (bus_nr == 1) 60 return dev->port_3_switch_enabled ? I2C_1_MUX_3 : I2C_1_MUX_1; 61 return bus_nr; 62 } 63 64 static inline bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus, 65 const struct i2c_msg *msg, int tuner_type) 66 { 67 int i2c_port = get_real_i2c_port(dev, bus->nr); 68 69 if (i2c_port != dev->board.tuner_i2c_master) 70 return false; 71 72 if (msg->addr != dev->board.tuner_addr) 73 return false; 74 75 if (dev->tuner_type != tuner_type) 76 return false; 77 78 return true; 79 } 80 81 /* 82 * cx231xx_i2c_send_bytes() 83 */ 84 static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap, 85 const struct i2c_msg *msg) 86 { 87 struct cx231xx_i2c *bus = i2c_adap->algo_data; 88 struct cx231xx *dev = bus->dev; 89 struct cx231xx_i2c_xfer_data req_data; 90 int status = 0; 91 u16 size = 0; 92 u8 loop = 0; 93 u8 saddr_len = 1; 94 u8 *buf_ptr = NULL; 95 u16 saddr = 0; 96 u8 need_gpio = 0; 97 98 if (is_tuner(dev, bus, msg, TUNER_XC5000)) { 99 size = msg->len; 100 101 if (size == 2) { /* register write sub addr */ 102 /* Just writing sub address will cause problem 103 * to XC5000. So ignore the request */ 104 return 0; 105 } else if (size == 4) { /* register write with sub addr */ 106 if (msg->len >= 2) 107 saddr = msg->buf[0] << 8 | msg->buf[1]; 108 else if (msg->len == 1) 109 saddr = msg->buf[0]; 110 111 switch (saddr) { 112 case 0x0000: /* start tuner calibration mode */ 113 need_gpio = 1; 114 /* FW Loading is done */ 115 dev->xc_fw_load_done = 1; 116 break; 117 case 0x000D: /* Set signal source */ 118 case 0x0001: /* Set TV standard - Video */ 119 case 0x0002: /* Set TV standard - Audio */ 120 case 0x0003: /* Set RF Frequency */ 121 need_gpio = 1; 122 break; 123 default: 124 if (dev->xc_fw_load_done) 125 need_gpio = 1; 126 break; 127 } 128 129 if (need_gpio) { 130 dprintk1(1, 131 "GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n", 132 msg->addr, msg->len, saddr); 133 134 return dev->cx231xx_gpio_i2c_write(dev, 135 msg->addr, 136 msg->buf, 137 msg->len); 138 } 139 } 140 141 /* special case for Xc5000 tuner case */ 142 saddr_len = 1; 143 144 /* adjust the length to correct length */ 145 size -= saddr_len; 146 buf_ptr = (u8 *) (msg->buf + 1); 147 148 do { 149 /* prepare xfer_data struct */ 150 req_data.dev_addr = msg->addr; 151 req_data.direction = msg->flags; 152 req_data.saddr_len = saddr_len; 153 req_data.saddr_dat = msg->buf[0]; 154 req_data.buf_size = size > 16 ? 16 : size; 155 req_data.p_buffer = (u8 *) (buf_ptr + loop * 16); 156 157 bus->i2c_nostop = (size > 16) ? 1 : 0; 158 bus->i2c_reserve = (loop == 0) ? 0 : 1; 159 160 /* usb send command */ 161 status = dev->cx231xx_send_usb_command(bus, &req_data); 162 loop++; 163 164 if (size >= 16) 165 size -= 16; 166 else 167 size = 0; 168 169 } while (size > 0); 170 171 bus->i2c_nostop = 0; 172 bus->i2c_reserve = 0; 173 174 } else { /* regular case */ 175 176 /* prepare xfer_data struct */ 177 req_data.dev_addr = msg->addr; 178 req_data.direction = msg->flags; 179 req_data.saddr_len = 0; 180 req_data.saddr_dat = 0; 181 req_data.buf_size = msg->len; 182 req_data.p_buffer = msg->buf; 183 184 /* usb send command */ 185 status = dev->cx231xx_send_usb_command(bus, &req_data); 186 } 187 188 return status < 0 ? status : 0; 189 } 190 191 /* 192 * cx231xx_i2c_recv_bytes() 193 * read a byte from the i2c device 194 */ 195 static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap, 196 const struct i2c_msg *msg) 197 { 198 struct cx231xx_i2c *bus = i2c_adap->algo_data; 199 struct cx231xx *dev = bus->dev; 200 struct cx231xx_i2c_xfer_data req_data; 201 int status = 0; 202 u16 saddr = 0; 203 u8 need_gpio = 0; 204 205 if (is_tuner(dev, bus, msg, TUNER_XC5000)) { 206 if (msg->len == 2) 207 saddr = msg->buf[0] << 8 | msg->buf[1]; 208 else if (msg->len == 1) 209 saddr = msg->buf[0]; 210 211 if (dev->xc_fw_load_done) { 212 213 switch (saddr) { 214 case 0x0009: /* BUSY check */ 215 dprintk1(1, 216 "GPIO R E A D: Special case BUSY check \n"); 217 /*Try read BUSY register, just set it to zero*/ 218 msg->buf[0] = 0; 219 if (msg->len == 2) 220 msg->buf[1] = 0; 221 return 0; 222 case 0x0004: /* read Lock status */ 223 need_gpio = 1; 224 break; 225 226 } 227 228 if (need_gpio) { 229 /* this is a special case to handle Xceive tuner 230 clock stretch issue with gpio based I2C */ 231 232 dprintk1(1, 233 "GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n", 234 msg->addr, msg->len, 235 msg->buf[0] << 8 | msg->buf[1]); 236 237 status = 238 dev->cx231xx_gpio_i2c_write(dev, msg->addr, 239 msg->buf, 240 msg->len); 241 status = 242 dev->cx231xx_gpio_i2c_read(dev, msg->addr, 243 msg->buf, 244 msg->len); 245 return status; 246 } 247 } 248 249 /* prepare xfer_data struct */ 250 req_data.dev_addr = msg->addr; 251 req_data.direction = msg->flags; 252 req_data.saddr_len = msg->len; 253 req_data.saddr_dat = msg->buf[0] << 8 | msg->buf[1]; 254 req_data.buf_size = msg->len; 255 req_data.p_buffer = msg->buf; 256 257 /* usb send command */ 258 status = dev->cx231xx_send_usb_command(bus, &req_data); 259 260 } else { 261 262 /* prepare xfer_data struct */ 263 req_data.dev_addr = msg->addr; 264 req_data.direction = msg->flags; 265 req_data.saddr_len = 0; 266 req_data.saddr_dat = 0; 267 req_data.buf_size = msg->len; 268 req_data.p_buffer = msg->buf; 269 270 /* usb send command */ 271 status = dev->cx231xx_send_usb_command(bus, &req_data); 272 } 273 274 return status < 0 ? status : 0; 275 } 276 277 /* 278 * cx231xx_i2c_recv_bytes_with_saddr() 279 * read a byte from the i2c device 280 */ 281 static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap, 282 const struct i2c_msg *msg1, 283 const struct i2c_msg *msg2) 284 { 285 struct cx231xx_i2c *bus = i2c_adap->algo_data; 286 struct cx231xx *dev = bus->dev; 287 struct cx231xx_i2c_xfer_data req_data; 288 int status = 0; 289 u16 saddr = 0; 290 u8 need_gpio = 0; 291 292 if (msg1->len == 2) 293 saddr = msg1->buf[0] << 8 | msg1->buf[1]; 294 else if (msg1->len == 1) 295 saddr = msg1->buf[0]; 296 297 if (is_tuner(dev, bus, msg2, TUNER_XC5000)) { 298 if ((msg2->len < 16)) { 299 300 dprintk1(1, 301 "i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n", 302 msg2->addr, msg2->len, saddr, msg1->len); 303 304 switch (saddr) { 305 case 0x0008: /* read FW load status */ 306 need_gpio = 1; 307 break; 308 case 0x0004: /* read Lock status */ 309 need_gpio = 1; 310 break; 311 } 312 313 if (need_gpio) { 314 status = 315 dev->cx231xx_gpio_i2c_write(dev, msg1->addr, 316 msg1->buf, 317 msg1->len); 318 status = 319 dev->cx231xx_gpio_i2c_read(dev, msg2->addr, 320 msg2->buf, 321 msg2->len); 322 return status; 323 } 324 } 325 } 326 327 /* prepare xfer_data struct */ 328 req_data.dev_addr = msg2->addr; 329 req_data.direction = msg2->flags; 330 req_data.saddr_len = msg1->len; 331 req_data.saddr_dat = saddr; 332 req_data.buf_size = msg2->len; 333 req_data.p_buffer = msg2->buf; 334 335 /* usb send command */ 336 status = dev->cx231xx_send_usb_command(bus, &req_data); 337 338 return status < 0 ? status : 0; 339 } 340 341 /* 342 * cx231xx_i2c_check_for_device() 343 * check if there is a i2c_device at the supplied address 344 */ 345 static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap, 346 const struct i2c_msg *msg) 347 { 348 struct cx231xx_i2c *bus = i2c_adap->algo_data; 349 struct cx231xx *dev = bus->dev; 350 struct cx231xx_i2c_xfer_data req_data; 351 int status = 0; 352 u8 buf[1]; 353 354 /* prepare xfer_data struct */ 355 req_data.dev_addr = msg->addr; 356 req_data.direction = I2C_M_RD; 357 req_data.saddr_len = 0; 358 req_data.saddr_dat = 0; 359 req_data.buf_size = 1; 360 req_data.p_buffer = buf; 361 362 /* usb send command */ 363 status = dev->cx231xx_send_usb_command(bus, &req_data); 364 365 return status < 0 ? status : 0; 366 } 367 368 /* 369 * cx231xx_i2c_xfer() 370 * the main i2c transfer function 371 */ 372 static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap, 373 struct i2c_msg msgs[], int num) 374 { 375 struct cx231xx_i2c *bus = i2c_adap->algo_data; 376 struct cx231xx *dev = bus->dev; 377 int addr, rc, i, byte; 378 379 if (num <= 0) 380 return 0; 381 mutex_lock(&dev->i2c_lock); 382 for (i = 0; i < num; i++) { 383 384 addr = msgs[i].addr; 385 386 dprintk2(2, "%s %s addr=0x%x len=%d:", 387 (msgs[i].flags & I2C_M_RD) ? "read" : "write", 388 i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len); 389 if (!msgs[i].len) { 390 /* no len: check only for device presence */ 391 rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]); 392 if (rc < 0) { 393 dprintk2(2, " no device\n"); 394 mutex_unlock(&dev->i2c_lock); 395 return rc; 396 } 397 398 } else if (msgs[i].flags & I2C_M_RD) { 399 /* read bytes */ 400 rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]); 401 if (i2c_debug >= 2) { 402 for (byte = 0; byte < msgs[i].len; byte++) 403 printk(KERN_CONT " %02x", msgs[i].buf[byte]); 404 } 405 } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && 406 msgs[i].addr == msgs[i + 1].addr 407 && (msgs[i].len <= 2) && (bus->nr < 3)) { 408 /* write bytes */ 409 if (i2c_debug >= 2) { 410 for (byte = 0; byte < msgs[i].len; byte++) 411 printk(KERN_CONT " %02x", msgs[i].buf[byte]); 412 printk(KERN_CONT "\n"); 413 } 414 /* read bytes */ 415 dprintk2(2, "plus %s %s addr=0x%x len=%d:", 416 (msgs[i+1].flags & I2C_M_RD) ? "read" : "write", 417 i+1 == num - 1 ? "stop" : "nonstop", addr, msgs[i+1].len); 418 rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap, 419 &msgs[i], 420 &msgs[i + 1]); 421 if (i2c_debug >= 2) { 422 for (byte = 0; byte < msgs[i+1].len; byte++) 423 printk(KERN_CONT " %02x", msgs[i+1].buf[byte]); 424 } 425 i++; 426 } else { 427 /* write bytes */ 428 if (i2c_debug >= 2) { 429 for (byte = 0; byte < msgs[i].len; byte++) 430 printk(KERN_CONT " %02x", msgs[i].buf[byte]); 431 } 432 rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]); 433 } 434 if (rc < 0) 435 goto err; 436 if (i2c_debug >= 2) 437 printk(KERN_CONT "\n"); 438 } 439 mutex_unlock(&dev->i2c_lock); 440 return num; 441 err: 442 dprintk2(2, " ERROR: %i\n", rc); 443 mutex_unlock(&dev->i2c_lock); 444 return rc; 445 } 446 447 /* ----------------------------------------------------------- */ 448 449 /* 450 * functionality() 451 */ 452 static u32 functionality(struct i2c_adapter *adap) 453 { 454 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; 455 } 456 457 static struct i2c_algorithm cx231xx_algo = { 458 .master_xfer = cx231xx_i2c_xfer, 459 .functionality = functionality, 460 }; 461 462 static struct i2c_adapter cx231xx_adap_template = { 463 .owner = THIS_MODULE, 464 .name = "cx231xx", 465 .algo = &cx231xx_algo, 466 }; 467 468 /* ----------------------------------------------------------- */ 469 470 /* 471 * i2c_devs 472 * incomplete list of known devices 473 */ 474 static const char *i2c_devs[128] = { 475 [0x20 >> 1] = "demod", 476 [0x60 >> 1] = "colibri", 477 [0x88 >> 1] = "hammerhead", 478 [0x8e >> 1] = "CIR", 479 [0x32 >> 1] = "GeminiIII", 480 [0x02 >> 1] = "Aquarius", 481 [0xa0 >> 1] = "eeprom", 482 [0xc0 >> 1] = "tuner", 483 [0xc2 >> 1] = "tuner", 484 }; 485 486 /* 487 * cx231xx_do_i2c_scan() 488 * check i2c address range for devices 489 */ 490 void cx231xx_do_i2c_scan(struct cx231xx *dev, int i2c_port) 491 { 492 unsigned char buf; 493 int i, rc; 494 struct i2c_client client; 495 496 if (!i2c_scan) 497 return; 498 499 /* Don't generate I2C errors during scan */ 500 dev->i2c_scan_running = true; 501 502 memset(&client, 0, sizeof(client)); 503 client.adapter = cx231xx_get_i2c_adap(dev, i2c_port); 504 505 for (i = 0; i < 128; i++) { 506 client.addr = i; 507 rc = i2c_master_recv(&client, &buf, 0); 508 if (rc < 0) 509 continue; 510 dev_info(dev->dev, 511 "i2c scan: found device @ port %d addr 0x%x [%s]\n", 512 i2c_port, 513 i << 1, 514 i2c_devs[i] ? i2c_devs[i] : "???"); 515 } 516 517 dev->i2c_scan_running = false; 518 } 519 520 /* 521 * cx231xx_i2c_register() 522 * register i2c bus 523 */ 524 int cx231xx_i2c_register(struct cx231xx_i2c *bus) 525 { 526 struct cx231xx *dev = bus->dev; 527 528 BUG_ON(!dev->cx231xx_send_usb_command); 529 530 bus->i2c_adap = cx231xx_adap_template; 531 bus->i2c_adap.dev.parent = dev->dev; 532 533 snprintf(bus->i2c_adap.name, sizeof(bus->i2c_adap.name), "%s-%d", bus->dev->name, bus->nr); 534 535 bus->i2c_adap.algo_data = bus; 536 i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev); 537 i2c_add_adapter(&bus->i2c_adap); 538 539 if (0 != bus->i2c_rc) 540 dev_warn(dev->dev, 541 "i2c bus %d register FAILED\n", bus->nr); 542 543 return bus->i2c_rc; 544 } 545 546 /* 547 * cx231xx_i2c_unregister() 548 * unregister i2c_bus 549 */ 550 int cx231xx_i2c_unregister(struct cx231xx_i2c *bus) 551 { 552 i2c_del_adapter(&bus->i2c_adap); 553 return 0; 554 } 555 556 /* 557 * cx231xx_i2c_mux_select() 558 * switch i2c master number 1 between port1 and port3 559 */ 560 static int cx231xx_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan_id) 561 { 562 struct cx231xx *dev = i2c_mux_priv(muxc); 563 564 return cx231xx_enable_i2c_port_3(dev, chan_id); 565 } 566 567 int cx231xx_i2c_mux_create(struct cx231xx *dev) 568 { 569 dev->muxc = i2c_mux_alloc(&dev->i2c_bus[1].i2c_adap, dev->dev, 2, 0, 0, 570 cx231xx_i2c_mux_select, NULL); 571 if (!dev->muxc) 572 return -ENOMEM; 573 dev->muxc->priv = dev; 574 return 0; 575 } 576 577 int cx231xx_i2c_mux_register(struct cx231xx *dev, int mux_no) 578 { 579 int rc; 580 581 rc = i2c_mux_add_adapter(dev->muxc, 582 0, 583 mux_no /* chan_id */, 584 0 /* class */); 585 if (rc) 586 dev_warn(dev->dev, 587 "i2c mux %d register FAILED\n", mux_no); 588 589 return rc; 590 } 591 592 void cx231xx_i2c_mux_unregister(struct cx231xx *dev) 593 { 594 i2c_mux_del_adapters(dev->muxc); 595 } 596 597 struct i2c_adapter *cx231xx_get_i2c_adap(struct cx231xx *dev, int i2c_port) 598 { 599 switch (i2c_port) { 600 case I2C_0: 601 return &dev->i2c_bus[0].i2c_adap; 602 case I2C_1: 603 return &dev->i2c_bus[1].i2c_adap; 604 case I2C_2: 605 return &dev->i2c_bus[2].i2c_adap; 606 case I2C_1_MUX_1: 607 return dev->muxc->adapter[0]; 608 case I2C_1_MUX_3: 609 return dev->muxc->adapter[1]; 610 default: 611 return NULL; 612 } 613 } 614 EXPORT_SYMBOL_GPL(cx231xx_get_i2c_adap); 615