drivers/media/video/em28xx/em28xx-i2c.c

   1 /*
   2    em2820-i2c.c - driver for Empia EM2820/2840 USB video capture devices
   3
   4    Copyright (C) 2005 Markus Rechberger <mrechberger@gmail.com>
   5                       Ludovico Cavedon <cavedon@sssup.it>
   6                       Mauro Carvalho Chehab <mchehab@brturbo.com.br>
   7
   8    Based on the em2800 driver from Sascha Sommer <saschasommer@freenet.de>
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/usb.h>
  28 #include <linux/i2c.h>
  29 #include <media/tuner.h>
  30 #include <linux/video_decoder.h>
  31
  32 /* To be moved to compat.h */
  33 #if !defined(I2C_HW_B_EM2820)
  34 #define I2C_HW_B_EM2820 I2C_HW_B_BT848
  35 #endif
  36
  37 #include "em2820.h"
  38
  39 /* ----------------------------------------------------------- */
  40
  41 static unsigned int i2c_scan = 0;
  42 module_param(i2c_scan, int, 0444);
  43 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
  44
  45 static unsigned int i2c_debug = 0;
  46 module_param(i2c_debug, int, 0644);
  47 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
  48
  49 #define dprintk(fmt, args...) if (i2c_debug) do {\
  50                         printk(KERN_DEBUG "%s: %s: " fmt "\n",\
  51                         dev->name, __FUNCTION__ , ##args); } while (0)
  52 #define dprintk1(fmt, args...) if (i2c_debug) do{ \
  53                         printk(KERN_DEBUG "%s: %s: " fmt, \
  54                         dev->name, __FUNCTION__ , ##args); } while (0)
  55 #define dprintk2(fmt, args...) if (i2c_debug) do {\
  56                         printk(fmt , ##args); } while (0)
  57
  58 /*
  59  * i2c_send_bytes()
  60  * untested for more than 4 bytes
  61  */
  62 static int i2c_send_bytes(void *data, unsigned char addr, char *buf, short len,
  63                           int stop)
  64 {
  65         int wrcount = 0;
  66         struct em2820 *dev = (struct em2820 *)data;
  67
  68         wrcount = dev->em2820_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
  69
  70         return wrcount;
  71 }
  72
  73 /*
  74  * i2c_recv_byte()
  75  * read a byte from the i2c device
  76  */
  77 static int i2c_recv_bytes(struct em2820 *dev, unsigned char addr, char *buf,
  78                           int len)
  79 {
  80         int ret;
  81         ret = dev->em2820_read_reg_req_len(dev, 2, addr, buf, len);
  82         if (ret < 0) {
  83                 em2820_warn("reading i2c device failed (error=%i)\n", ret);
  84                 return ret;
  85         }
  86         if (dev->em2820_read_reg(dev, 0x5) != 0)
  87                 return -ENODEV;
  88         return ret;
  89 }
  90
  91 /*
  92  * i2c_check_for_device()
  93  * check if there is a i2c_device at the supplied address
  94  */
  95 static int i2c_check_for_device(struct em2820 *dev, unsigned char addr)
  96 {
  97         char msg;
  98         int ret;
  99         msg = addr;
 100
 101         ret = dev->em2820_read_reg_req(dev, 2, addr);
 102         if (ret < 0) {
 103                 em2820_warn("reading from i2c device failed (error=%i)\n", ret);
 104                 return ret;
 105         }
 106         if (dev->em2820_read_reg(dev, 0x5) != 0)
 107                 return -ENODEV;
 108         return 0;
 109 }
 110
 111 /*
 112  * em2820_i2c_xfer()
 113  * the main i2c transfer function
 114  */
 115 static int em2820_i2c_xfer(struct i2c_adapter *i2c_adap,
 116                            struct i2c_msg msgs[], int num)
 117 {
 118         struct em2820 *dev = i2c_adap->algo_data;
 119         int addr, rc, i, byte;
 120
 121         if (num <= 0)
 122                 return 0;
 123         for (i = 0; i < num; i++) {
 124                 addr = msgs[i].addr << 1;
 125                 dprintk1("%s %s addr=%x len=%d:",
 126                          (msgs[i].flags & I2C_M_RD) ? "read" : "write",
 127                          i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
 128                 if (!msgs[i].len) {     /* no len: check only for device presence */
 129                         rc = i2c_check_for_device(dev, addr);
 130                         if (rc < 0) {
 131                                 dprintk2(" no device\n");
 132                                 return rc;
 133                         }
 134
 135                 }
 136                 if (msgs[i].flags & I2C_M_RD) {
 137                         /* read bytes */
 138
 139                         rc = i2c_recv_bytes(dev, addr, msgs[i].buf,
 140                                             msgs[i].len);
 141                         if (i2c_debug) {
 142                                 for (byte = 0; byte < msgs[i].len; byte++) {
 143                                         printk(" %02x", msgs[i].buf[byte]);
 144                                 }
 145                         }
 146                 } else {
 147                         /* write bytes */
 148                         if (i2c_debug) {
 149                                 for (byte = 0; byte < msgs[i].len; byte++)
 150                                         printk(" %02x", msgs[i].buf[byte]);
 151                         }
 152                         rc = i2c_send_bytes(dev, addr, msgs[i].buf, msgs[i].len,
 153                                             i == num - 1);
 154                         if (rc < 0)
 155                                 goto err;
 156                 }
 157                 if (i2c_debug)
 158                         printk("\n");
 159         }
 160
 161         return num;
 162       err:
 163         dprintk2(" ERROR: %i\n", rc);
 164         return rc;
 165 }
 166
 167 static int em2820_i2c_eeprom(struct em2820 *dev, unsigned char *eedata, int len)
 168 {
 169         unsigned char buf, *p = eedata;
 170         struct em2820_eeprom *em_eeprom = (void *)eedata;
 171         int i, err, size = len, block;
 172
 173         dev->i2c_client.addr = 0xa0 >> 1;
 174         buf = 0;
 175         if (1 != (err = i2c_master_send(&dev->i2c_client, &buf, 1))) {
 176                 printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
 177                        dev->name, err);
 178                 return -1;
 179         }
 180         while (size > 0) {
 181                 if (size > 16)
 182                         block = 16;
 183                 else
 184                         block = size;
 185
 186                 if (block !=
 187                     (err = i2c_master_recv(&dev->i2c_client, p, block))) {
 188                         printk(KERN_WARNING
 189                                "%s: i2c eeprom read error (err=%d)\n",
 190                                dev->name, err);
 191                         return -1;
 192                 }
 193                 size -= block;
 194                 p += block;
 195         }
 196         for (i = 0; i < len; i++) {
 197                 if (0 == (i % 16))
 198                         printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
 199                 printk(" %02x", eedata[i]);
 200                 if (15 == (i % 16))
 201                         printk("\n");
 202         }
 203
 204         printk(KERN_INFO "EEPROM ID= 0x%08x\n", em_eeprom->id);
 205         printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID,
 206                em_eeprom->product_ID);
 207
 208         switch (em_eeprom->chip_conf >> 4 & 0x3) {
 209         case 0:
 210                 printk(KERN_INFO "No audio on board.\n");
 211                 break;
 212         case 1:
 213                 printk(KERN_INFO "AC97 audio (5 sample rates)\n");
 214                 break;
 215         case 2:
 216                 printk(KERN_INFO "I2S audio, sample rate=32k\n");
 217                 break;
 218         case 3:
 219                 printk(KERN_INFO "I2S audio, 3 sample rates\n");
 220                 break;
 221         }
 222
 223         if (em_eeprom->chip_conf & 1 << 3)
 224                 printk(KERN_INFO "USB Remote wakeup capable\n");
 225
 226         if (em_eeprom->chip_conf & 1 << 2)
 227                 printk(KERN_INFO "USB Self power capable\n");
 228
 229         switch (em_eeprom->chip_conf & 0x3) {
 230         case 0:
 231                 printk(KERN_INFO "500mA max power\n");
 232                 break;
 233         case 1:
 234                 printk(KERN_INFO "400mA max power\n");
 235                 break;
 236         case 2:
 237                 printk(KERN_INFO "300mA max power\n");
 238                 break;
 239         case 3:
 240                 printk(KERN_INFO "200mA max power\n");
 241                 break;
 242         }
 243
 244         return 0;
 245 }
 246
 247 /* ----------------------------------------------------------- */
 248
 249 /*
 250  * algo_control()
 251  */
 252 static int algo_control(struct i2c_adapter *adapter,
 253                         unsigned int cmd, unsigned long arg)
 254 {
 255         return 0;
 256 }
 257
 258 /*
 259  * functionality()
 260  */
 261 static u32 functionality(struct i2c_adapter *adap)
 262 {
 263         return I2C_FUNC_SMBUS_EMUL;
 264 }
 265
 266 #ifndef I2C_PEC
 267 static void inc_use(struct i2c_adapter *adap)
 268 {
 269         MOD_INC_USE_COUNT;
 270 }
 271
 272 static void dec_use(struct i2c_adapter *adap)
 273 {
 274         MOD_DEC_USE_COUNT;
 275 }
 276 #endif
 277
 278 static int em2820_set_tuner(int check_eeprom, struct i2c_client *client)
 279 {
 280         struct em2820 *dev = client->adapter->algo_data;
 281         struct tuner_setup tun_setup;
 282
 283         if (dev->has_tuner) {
 284                 tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
 285                 tun_setup.type = dev->tuner_type;
 286                 tun_setup.addr = dev->tuner_addr;
 287
 288                 em2820_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);
 289         }
 290
 291         return (0);
 292 }
 293
 294 /*
 295  * attach_inform()
 296  * gets called when a device attaches to the i2c bus
 297  * does some basic configuration
 298  */
 299 static int attach_inform(struct i2c_client *client)
 300 {
 301         struct em2820 *dev = client->adapter->algo_data;
 302
 303         dprintk("address %x", client->addr << 1);
 304         switch (client->addr << 1) {
 305                 case 0x86:
 306                         em2820_i2c_call_clients(dev, TDA9887_SET_CONFIG, &dev->tda9887_conf);
 307                         break;
 308                 case 0x4a:
 309                         dprintk1("attach_inform: saa7113 detected.\n");
 310                         break;
 311                 case 0xa0:
 312                         dprintk1("attach_inform: eeprom detected.\n");
 313                         break;
 314                 case 0x80:
 315                 case 0x88:
 316                         dprintk1("attach_inform: msp34xx detected.\n");
 317                         break;
 318                 case 0xb8:
 319                 case 0xba:
 320                         dprintk1("attach_inform: tvp5150 detected.\n");
 321                         break;
 322                 default:
 323                         dev->tuner_addr = client->addr;
 324                         em2820_set_tuner(-1, client);
 325         }
 326
 327         return 0;
 328 }
 329
 330 static struct i2c_algorithm em2820_algo = {
 331         .master_xfer   = em2820_i2c_xfer,
 332         .algo_control  = algo_control,
 333         .functionality = functionality,
 334 };
 335
 336 static struct i2c_adapter em2820_adap_template = {
 337 #ifdef I2C_PEC
 338         .owner = THIS_MODULE,
 339 #else
 340         .inc_use = inc_use,
 341         .dec_use = dec_use,
 342 #endif
 343 #ifdef I2C_CLASS_TV_ANALOG
 344         .class = I2C_CLASS_TV_ANALOG,
 345 #endif
 346         .name = "em2820",
 347         .id = I2C_HW_B_EM2820,
 348         .algo = &em2820_algo,
 349         .client_register = attach_inform,
 350 };
 351
 352 static struct i2c_client em2820_client_template = {
 353         .name = "em2820 internal",
 354         .flags = I2C_CLIENT_ALLOW_USE,
 355 };
 356
 357 /* ----------------------------------------------------------- */
 358
 359 /*
 360  * i2c_devs
 361  * incomplete list of known devices
 362  */
 363 static char *i2c_devs[128] = {
 364         [0x4a >> 1] = "saa7113h",
 365         [0x60 >> 1] = "remote IR sensor",
 366         [0x86 >> 1] = "tda9887",
 367         [0x80 >> 1] = "msp34xx",
 368         [0x88 >> 1] = "msp34xx",
 369         [0xa0 >> 1] = "eeprom",
 370         [0xb8 >> 1] = "tvp5150a",
 371         [0xba >> 1] = "tvp5150a",
 372         [0xc0 >> 1] = "tuner (analog)",
 373         [0xc2 >> 1] = "tuner (analog)",
 374         [0xc4 >> 1] = "tuner (analog)",
 375         [0xc6 >> 1] = "tuner (analog)",
 376 };
 377
 378 /*
 379  * do_i2c_scan()
 380  * check i2c address range for devices
 381  */
 382 static void do_i2c_scan(char *name, struct i2c_client *c)
 383 {
 384         unsigned char buf;
 385         int i, rc;
 386
 387         for (i = 0; i < 128; i++) {
 388                 c->addr = i;
 389                 rc = i2c_master_recv(c, &buf, 0);
 390                 if (rc < 0)
 391                         continue;
 392                 printk(KERN_INFO "%s: found device @ 0x%x [%s]", name,
 393                        i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 394         }
 395 }
 396
 397 /*
 398  * em2820_i2c_call_clients()
 399  * send commands to all attached i2c devices
 400  */
 401 void em2820_i2c_call_clients(struct em2820 *dev, unsigned int cmd, void *arg)
 402 {
 403         BUG_ON(NULL == dev->i2c_adap.algo_data);
 404         i2c_clients_command(&dev->i2c_adap, cmd, arg);
 405 }
 406
 407 /*
 408  * em2820_i2c_register()
 409  * register i2c bus
 410  */
 411 int em2820_i2c_register(struct em2820 *dev)
 412 {
 413         BUG_ON(!dev->em2820_write_regs || !dev->em2820_read_reg);
 414         BUG_ON(!dev->em2820_write_regs_req || !dev->em2820_read_reg_req);
 415         dev->i2c_adap = em2820_adap_template;
 416         dev->i2c_adap.dev.parent = &dev->udev->dev;
 417         strcpy(dev->i2c_adap.name, dev->name);
 418         dev->i2c_adap.algo_data = dev;
 419         i2c_add_adapter(&dev->i2c_adap);
 420
 421         dev->i2c_client = em2820_client_template;
 422         dev->i2c_client.adapter = &dev->i2c_adap;
 423
 424         em2820_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
 425
 426         if (i2c_scan)
 427                 do_i2c_scan(dev->name, &dev->i2c_client);
 428         return 0;
 429 }
 430
 431 /*
 432  * em2820_i2c_unregister()
 433  * unregister i2c_bus
 434  */
 435 int em2820_i2c_unregister(struct em2820 *dev)
 436 {
 437         i2c_del_adapter(&dev->i2c_adap);
 438         return 0;
 439 }