1 /* 2 * 3 * device driver for philips saa7134 based TV cards 4 * i2c interface support 5 * 6 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs] 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 19 #include "saa7134.h" 20 #include "saa7134-reg.h" 21 22 #include <linux/init.h> 23 #include <linux/list.h> 24 #include <linux/module.h> 25 #include <linux/kernel.h> 26 #include <linux/delay.h> 27 28 #include <media/v4l2-common.h> 29 30 /* ----------------------------------------------------------- */ 31 32 static unsigned int i2c_debug; 33 module_param(i2c_debug, int, 0644); 34 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]"); 35 36 static unsigned int i2c_scan; 37 module_param(i2c_scan, int, 0444); 38 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time"); 39 40 #define i2c_dbg(level, fmt, arg...) do { \ 41 if (i2c_debug == level) \ 42 printk(KERN_DEBUG pr_fmt("i2c: " fmt), ## arg); \ 43 } while (0) 44 45 #define i2c_cont(level, fmt, arg...) do { \ 46 if (i2c_debug == level) \ 47 pr_cont(fmt, ## arg); \ 48 } while (0) 49 50 #define I2C_WAIT_DELAY 32 51 #define I2C_WAIT_RETRY 16 52 53 /* ----------------------------------------------------------- */ 54 55 static char *str_i2c_status[] = { 56 "IDLE", "DONE_STOP", "BUSY", "TO_SCL", "TO_ARB", "DONE_WRITE", 57 "DONE_READ", "DONE_WRITE_TO", "DONE_READ_TO", "NO_DEVICE", 58 "NO_ACKN", "BUS_ERR", "ARB_LOST", "SEQ_ERR", "ST_ERR", "SW_ERR" 59 }; 60 61 enum i2c_status { 62 IDLE = 0, // no I2C command pending 63 DONE_STOP = 1, // I2C command done and STOP executed 64 BUSY = 2, // executing I2C command 65 TO_SCL = 3, // executing I2C command, time out on clock stretching 66 TO_ARB = 4, // time out on arbitration trial, still trying 67 DONE_WRITE = 5, // I2C command done and awaiting next write command 68 DONE_READ = 6, // I2C command done and awaiting next read command 69 DONE_WRITE_TO = 7, // see 5, and time out on status echo 70 DONE_READ_TO = 8, // see 6, and time out on status echo 71 NO_DEVICE = 9, // no acknowledge on device slave address 72 NO_ACKN = 10, // no acknowledge after data byte transfer 73 BUS_ERR = 11, // bus error 74 ARB_LOST = 12, // arbitration lost during transfer 75 SEQ_ERR = 13, // erroneous programming sequence 76 ST_ERR = 14, // wrong status echoing 77 SW_ERR = 15 // software error 78 }; 79 80 static char *str_i2c_attr[] = { 81 "NOP", "STOP", "CONTINUE", "START" 82 }; 83 84 enum i2c_attr { 85 NOP = 0, // no operation on I2C bus 86 STOP = 1, // stop condition, no associated byte transfer 87 CONTINUE = 2, // continue with byte transfer 88 START = 3 // start condition with byte transfer 89 }; 90 91 static inline enum i2c_status i2c_get_status(struct saa7134_dev *dev) 92 { 93 enum i2c_status status; 94 95 status = saa_readb(SAA7134_I2C_ATTR_STATUS) & 0x0f; 96 i2c_dbg(2, "i2c stat <= %s\n", str_i2c_status[status]); 97 return status; 98 } 99 100 static inline void i2c_set_status(struct saa7134_dev *dev, 101 enum i2c_status status) 102 { 103 i2c_dbg(2, "i2c stat => %s\n", str_i2c_status[status]); 104 saa_andorb(SAA7134_I2C_ATTR_STATUS,0x0f,status); 105 } 106 107 static inline void i2c_set_attr(struct saa7134_dev *dev, enum i2c_attr attr) 108 { 109 i2c_dbg(2, "i2c attr => %s\n", str_i2c_attr[attr]); 110 saa_andorb(SAA7134_I2C_ATTR_STATUS,0xc0,attr << 6); 111 } 112 113 static inline int i2c_is_error(enum i2c_status status) 114 { 115 switch (status) { 116 case NO_DEVICE: 117 case NO_ACKN: 118 case BUS_ERR: 119 case ARB_LOST: 120 case SEQ_ERR: 121 case ST_ERR: 122 return true; 123 default: 124 return false; 125 } 126 } 127 128 static inline int i2c_is_idle(enum i2c_status status) 129 { 130 switch (status) { 131 case IDLE: 132 case DONE_STOP: 133 return true; 134 default: 135 return false; 136 } 137 } 138 139 static inline int i2c_is_busy(enum i2c_status status) 140 { 141 switch (status) { 142 case BUSY: 143 case TO_SCL: 144 case TO_ARB: 145 return true; 146 default: 147 return false; 148 } 149 } 150 151 static int i2c_is_busy_wait(struct saa7134_dev *dev) 152 { 153 enum i2c_status status; 154 int count; 155 156 for (count = 0; count < I2C_WAIT_RETRY; count++) { 157 status = i2c_get_status(dev); 158 if (!i2c_is_busy(status)) 159 break; 160 saa_wait(I2C_WAIT_DELAY); 161 } 162 if (I2C_WAIT_RETRY == count) 163 return false; 164 return true; 165 } 166 167 static int i2c_reset(struct saa7134_dev *dev) 168 { 169 enum i2c_status status; 170 int count; 171 172 i2c_dbg(2, "i2c reset\n"); 173 status = i2c_get_status(dev); 174 if (!i2c_is_error(status)) 175 return true; 176 i2c_set_status(dev,status); 177 178 for (count = 0; count < I2C_WAIT_RETRY; count++) { 179 status = i2c_get_status(dev); 180 if (!i2c_is_error(status)) 181 break; 182 udelay(I2C_WAIT_DELAY); 183 } 184 if (I2C_WAIT_RETRY == count) 185 return false; 186 187 if (!i2c_is_idle(status)) 188 return false; 189 190 i2c_set_attr(dev,NOP); 191 return true; 192 } 193 194 static inline int i2c_send_byte(struct saa7134_dev *dev, 195 enum i2c_attr attr, 196 unsigned char data) 197 { 198 enum i2c_status status; 199 __u32 dword; 200 201 /* have to write both attr + data in one 32bit word */ 202 dword = saa_readl(SAA7134_I2C_ATTR_STATUS >> 2); 203 dword &= 0x0f; 204 dword |= (attr << 6); 205 dword |= ((__u32)data << 8); 206 dword |= 0x00 << 16; /* 100 kHz */ 207 // dword |= 0x40 << 16; /* 400 kHz */ 208 dword |= 0xf0 << 24; 209 saa_writel(SAA7134_I2C_ATTR_STATUS >> 2, dword); 210 i2c_dbg(2, "i2c data => 0x%x\n", data); 211 212 if (!i2c_is_busy_wait(dev)) 213 return -EIO; 214 status = i2c_get_status(dev); 215 if (i2c_is_error(status)) 216 return -EIO; 217 return 0; 218 } 219 220 static inline int i2c_recv_byte(struct saa7134_dev *dev) 221 { 222 enum i2c_status status; 223 unsigned char data; 224 225 i2c_set_attr(dev,CONTINUE); 226 if (!i2c_is_busy_wait(dev)) 227 return -EIO; 228 status = i2c_get_status(dev); 229 if (i2c_is_error(status)) 230 return -EIO; 231 data = saa_readb(SAA7134_I2C_DATA); 232 i2c_dbg(2, "i2c data <= 0x%x\n", data); 233 return data; 234 } 235 236 static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap, 237 struct i2c_msg *msgs, int num) 238 { 239 struct saa7134_dev *dev = i2c_adap->algo_data; 240 enum i2c_status status; 241 unsigned char data; 242 int addr,rc,i,byte; 243 244 status = i2c_get_status(dev); 245 if (!i2c_is_idle(status)) 246 if (!i2c_reset(dev)) 247 return -EIO; 248 249 i2c_dbg(2, "start xfer\n"); 250 i2c_dbg(1, "i2c xfer:"); 251 for (i = 0; i < num; i++) { 252 if (!(msgs[i].flags & I2C_M_NOSTART) || 0 == i) { 253 /* send address */ 254 i2c_dbg(2, "send address\n"); 255 addr = msgs[i].addr << 1; 256 if (msgs[i].flags & I2C_M_RD) 257 addr |= 1; 258 if (i > 0 && msgs[i].flags & 259 I2C_M_RD && msgs[i].addr != 0x40 && 260 msgs[i].addr != 0x41 && 261 msgs[i].addr != 0x19) { 262 /* workaround for a saa7134 i2c bug 263 * needed to talk to the mt352 demux 264 * thanks to pinnacle for the hint */ 265 int quirk = 0xfe; 266 i2c_cont(1, " [%02x quirk]", quirk); 267 i2c_send_byte(dev,START,quirk); 268 i2c_recv_byte(dev); 269 } 270 i2c_cont(1, " < %02x", addr); 271 rc = i2c_send_byte(dev,START,addr); 272 if (rc < 0) 273 goto err; 274 } 275 if (msgs[i].flags & I2C_M_RD) { 276 /* read bytes */ 277 i2c_dbg(2, "read bytes\n"); 278 for (byte = 0; byte < msgs[i].len; byte++) { 279 i2c_cont(1, " ="); 280 rc = i2c_recv_byte(dev); 281 if (rc < 0) 282 goto err; 283 i2c_cont(1, "%02x", rc); 284 msgs[i].buf[byte] = rc; 285 } 286 /* discard mysterious extra byte when reading 287 from Samsung S5H1411. i2c bus gets error 288 if we do not. */ 289 if (0x19 == msgs[i].addr) { 290 i2c_cont(1, " ?"); 291 rc = i2c_recv_byte(dev); 292 if (rc < 0) 293 goto err; 294 i2c_cont(1, "%02x", rc); 295 } 296 } else { 297 /* write bytes */ 298 i2c_dbg(2, "write bytes\n"); 299 for (byte = 0; byte < msgs[i].len; byte++) { 300 data = msgs[i].buf[byte]; 301 i2c_cont(1, " %02x", data); 302 rc = i2c_send_byte(dev,CONTINUE,data); 303 if (rc < 0) 304 goto err; 305 } 306 } 307 } 308 i2c_dbg(2, "xfer done\n"); 309 i2c_cont(1, " >"); 310 i2c_set_attr(dev,STOP); 311 rc = -EIO; 312 if (!i2c_is_busy_wait(dev)) 313 goto err; 314 status = i2c_get_status(dev); 315 if (i2c_is_error(status)) 316 goto err; 317 /* ensure that the bus is idle for at least one bit slot */ 318 msleep(1); 319 320 i2c_cont(1, "\n"); 321 return num; 322 err: 323 if (1 == i2c_debug) { 324 status = i2c_get_status(dev); 325 i2c_cont(1, " ERROR: %s\n", str_i2c_status[status]); 326 } 327 return rc; 328 } 329 330 /* ----------------------------------------------------------- */ 331 332 static u32 functionality(struct i2c_adapter *adap) 333 { 334 return I2C_FUNC_SMBUS_EMUL; 335 } 336 337 static const struct i2c_algorithm saa7134_algo = { 338 .master_xfer = saa7134_i2c_xfer, 339 .functionality = functionality, 340 }; 341 342 static struct i2c_adapter saa7134_adap_template = { 343 .owner = THIS_MODULE, 344 .name = "saa7134", 345 .algo = &saa7134_algo, 346 }; 347 348 static struct i2c_client saa7134_client_template = { 349 .name = "saa7134 internal", 350 }; 351 352 /* ----------------------------------------------------------- */ 353 354 /* On Medion 7134 reading EEPROM needs DVB-T demod i2c gate open */ 355 static void saa7134_i2c_eeprom_md7134_gate(struct saa7134_dev *dev) 356 { 357 u8 subaddr = 0x7, dmdregval; 358 u8 data[2]; 359 int ret; 360 struct i2c_msg i2cgatemsg_r[] = { {.addr = 0x08, .flags = 0, 361 .buf = &subaddr, .len = 1}, 362 {.addr = 0x08, 363 .flags = I2C_M_RD, 364 .buf = &dmdregval, .len = 1} 365 }; 366 struct i2c_msg i2cgatemsg_w[] = { {.addr = 0x08, .flags = 0, 367 .buf = data, .len = 2} }; 368 369 ret = i2c_transfer(&dev->i2c_adap, i2cgatemsg_r, 2); 370 if ((ret == 2) && (dmdregval & 0x2)) { 371 pr_debug("%s: DVB-T demod i2c gate was left closed\n", 372 dev->name); 373 374 data[0] = subaddr; 375 data[1] = (dmdregval & ~0x2); 376 if (i2c_transfer(&dev->i2c_adap, i2cgatemsg_w, 1) != 1) 377 pr_err("%s: EEPROM i2c gate open failure\n", 378 dev->name); 379 } 380 } 381 382 static int 383 saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len) 384 { 385 unsigned char buf; 386 int i,err; 387 388 if (dev->board == SAA7134_BOARD_MD7134) 389 saa7134_i2c_eeprom_md7134_gate(dev); 390 391 dev->i2c_client.addr = 0xa0 >> 1; 392 buf = 0; 393 if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) { 394 pr_info("%s: Huh, no eeprom present (err=%d)?\n", 395 dev->name,err); 396 return -1; 397 } 398 if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) { 399 pr_warn("%s: i2c eeprom read error (err=%d)\n", 400 dev->name,err); 401 return -1; 402 } 403 404 for (i = 0; i < len; i += 16) { 405 int size = (len - i) > 16 ? 16 : len - i; 406 407 pr_info("i2c eeprom %02x: %*ph\n", i, size, &eedata[i]); 408 } 409 410 return 0; 411 } 412 413 static char *i2c_devs[128] = { 414 [ 0x20 ] = "mpeg encoder (saa6752hs)", 415 [ 0xa0 >> 1 ] = "eeprom", 416 [ 0xc0 >> 1 ] = "tuner (analog)", 417 [ 0x86 >> 1 ] = "tda9887", 418 [ 0x5a >> 1 ] = "remote control", 419 }; 420 421 static void do_i2c_scan(struct i2c_client *c) 422 { 423 unsigned char buf; 424 int i,rc; 425 426 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { 427 c->addr = i; 428 rc = i2c_master_recv(c,&buf,0); 429 if (rc < 0) 430 continue; 431 pr_info("i2c scan: found device @ 0x%x [%s]\n", 432 i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); 433 } 434 } 435 436 int saa7134_i2c_register(struct saa7134_dev *dev) 437 { 438 dev->i2c_adap = saa7134_adap_template; 439 dev->i2c_adap.dev.parent = &dev->pci->dev; 440 strcpy(dev->i2c_adap.name,dev->name); 441 dev->i2c_adap.algo_data = dev; 442 i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); 443 i2c_add_adapter(&dev->i2c_adap); 444 445 dev->i2c_client = saa7134_client_template; 446 dev->i2c_client.adapter = &dev->i2c_adap; 447 448 saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata)); 449 if (i2c_scan) 450 do_i2c_scan(&dev->i2c_client); 451 452 /* Instantiate the IR receiver device, if present */ 453 saa7134_probe_i2c_ir(dev); 454 return 0; 455 } 456 457 int saa7134_i2c_unregister(struct saa7134_dev *dev) 458 { 459 i2c_del_adapter(&dev->i2c_adap); 460 return 0; 461 } 462