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 <linux/videodev.h>
  30 #include <media/tuner.h>
  31 #include <linux/video_decoder.h>
  32
  33 /* To be moved to compat.h */
  34 #if !defined(I2C_HW_B_EM2820)
  35 #define I2C_HW_B_EM2820 I2C_HW_B_BT848
  36 #endif
  37
  38 #include "em2820.h"
  39
  40 /* ----------------------------------------------------------- */
  41
  42 static unsigned int i2c_scan = 0;
  43 module_param(i2c_scan, int, 0444);
  44 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
  45
  46 static unsigned int i2c_debug = 0;
  47 module_param(i2c_debug, int, 0644);
  48 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
  49
  50 #define dprintk(fmt, args...) if (i2c_debug) do {\
  51                         printk(KERN_DEBUG "%s: %s: " fmt "\n",\
  52                         dev->name, __FUNCTION__ , ##args); } while (0)
  53 #define dprintk1(fmt, args...) if (i2c_debug) do{ \
  54                         printk(KERN_DEBUG "%s: %s: " fmt, \
  55                         dev->name, __FUNCTION__ , ##args); } while (0)
  56 #define dprintk2(fmt, args...) if (i2c_debug) do {\
  57                         printk(fmt , ##args); } while (0)
  58
  59 /*
  60  * i2c_send_bytes()
  61  * untested for more than 4 bytes
  62  */
  63 static int i2c_send_bytes(void *data, unsigned char addr, char *buf, short len,
  64                           int stop)
  65 {
  66         int wrcount = 0;
  67         struct em2820 *dev = (struct em2820 *)data;
  68
  69         wrcount = dev->em2820_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
  70
  71         return wrcount;
  72 }
  73
  74 /*
  75  * i2c_recv_byte()
  76  * read a byte from the i2c device
  77  */
  78 static int i2c_recv_bytes(struct em2820 *dev, unsigned char addr, char *buf,
  79                           int len)
  80 {
  81         int ret;
  82         ret = dev->em2820_read_reg_req_len(dev, 2, addr, buf, len);
  83         if (ret < 0) {
  84                 em2820_warn("reading i2c device failed (error=%i)\n", ret);
  85                 return ret;
  86         }
  87         if (dev->em2820_read_reg(dev, 0x5) != 0)
  88                 return -ENODEV;
  89         return ret;
  90 }
  91
  92 /*
  93  * i2c_check_for_device()
  94  * check if there is a i2c_device at the supplied address
  95  */
  96 static int i2c_check_for_device(struct em2820 *dev, unsigned char addr)
  97 {
  98         char msg;
  99         int ret;
 100         msg = addr;
 101
 102         ret = dev->em2820_read_reg_req(dev, 2, addr);
 103         if (ret < 0) {
 104                 em2820_warn("reading from i2c device failed (error=%i)\n", ret);
 105                 return ret;
 106         }
 107         if (dev->em2820_read_reg(dev, 0x5) != 0)
 108                 return -ENODEV;
 109         return 0;
 110 }
 111
 112 /*
 113  * em2820_i2c_xfer()
 114  * the main i2c transfer function
 115  */
 116 static int em2820_i2c_xfer(struct i2c_adapter *i2c_adap,
 117                            struct i2c_msg msgs[], int num)
 118 {
 119         struct em2820 *dev = i2c_adap->algo_data;
 120         int addr, rc, i, byte;
 121
 122         if (num <= 0)
 123                 return 0;
 124         for (i = 0; i < num; i++) {
 125                 addr = msgs[i].addr << 1;
 126                 dprintk1("%s %s addr=%x len=%d:",
 127                          (msgs[i].flags & I2C_M_RD) ? "read" : "write",
 128                          i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
 129                 if (!msgs[i].len) {     /* no len: check only for device presence */
 130                         rc = i2c_check_for_device(dev, addr);
 131                         if (rc < 0) {
 132                                 dprintk2(" no device\n");
 133                                 return rc;
 134                         }
 135
 136                 }
 137                 if (msgs[i].flags & I2C_M_RD) {
 138                         /* read bytes */
 139
 140                         rc = i2c_recv_bytes(dev, addr, msgs[i].buf,
 141                                             msgs[i].len);
 142                         if (i2c_debug) {
 143                                 for (byte = 0; byte < msgs[i].len; byte++) {
 144                                         printk(" %02x", msgs[i].buf[byte]);
 145                                 }
 146                         }
 147                 } else {
 148                         /* write bytes */
 149                         if (i2c_debug) {
 150                                 for (byte = 0; byte < msgs[i].len; byte++)
 151                                         printk(" %02x", msgs[i].buf[byte]);
 152                         }
 153                         rc = i2c_send_bytes(dev, addr, msgs[i].buf, msgs[i].len,
 154                                             i == num - 1);
 155                         if (rc < 0)
 156                                 goto err;
 157                 }
 158                 if (i2c_debug)
 159                         printk("\n");
 160         }
 161
 162         return num;
 163       err:
 164         dprintk2(" ERROR: %i\n", rc);
 165         return rc;
 166 }
 167
 168 static int em2820_i2c_eeprom(struct em2820 *dev, unsigned char *eedata, int len)
 169 {
 170         unsigned char buf, *p = eedata;
 171         struct em2820_eeprom *em_eeprom = (void *)eedata;
 172         int i, err, size = len, block;
 173
 174         dev->i2c_client.addr = 0xa0 >> 1;
 175         buf = 0;
 176         if (1 != (err = i2c_master_send(&dev->i2c_client, &buf, 1))) {
 177                 printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
 178                        dev->name, err);
 179                 return -1;
 180         }
 181         while (size > 0) {
 182                 if (size > 16)
 183                         block = 16;
 184                 else
 185                         block = size;
 186
 187                 if (block !=
 188                     (err = i2c_master_recv(&dev->i2c_client, p, block))) {
 189                         printk(KERN_WARNING
 190                                "%s: i2c eeprom read error (err=%d)\n",
 191                                dev->name, err);
 192                         return -1;
 193                 }
 194                 size -= block;
 195                 p += block;
 196         }
 197         for (i = 0; i < len; i++) {
 198                 if (0 == (i % 16))
 199                         printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
 200                 printk(" %02x", eedata[i]);
 201                 if (15 == (i % 16))
 202                         printk("\n");
 203         }
 204
 205         printk(KERN_INFO "EEPROM ID= 0x%08x\n", em_eeprom->id);
 206         printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID,
 207                em_eeprom->product_ID);
 208
 209         switch (em_eeprom->chip_conf >> 4 & 0x3) {
 210         case 0:
 211                 printk(KERN_INFO "No audio on board.\n");
 212                 break;
 213         case 1:
 214                 printk(KERN_INFO "AC97 audio (5 sample rates)\n");
 215                 break;
 216         case 2:
 217                 printk(KERN_INFO "I2S audio, sample rate=32k\n");
 218                 break;
 219         case 3:
 220                 printk(KERN_INFO "I2S audio, 3 sample rates\n");
 221                 break;
 222         }
 223
 224         if (em_eeprom->chip_conf & 1 << 3)
 225                 printk(KERN_INFO "USB Remote wakeup capable\n");
 226
 227         if (em_eeprom->chip_conf & 1 << 2)
 228                 printk(KERN_INFO "USB Self power capable\n");
 229
 230         switch (em_eeprom->chip_conf & 0x3) {
 231         case 0:
 232                 printk(KERN_INFO "500mA max power\n");
 233                 break;
 234         case 1:
 235                 printk(KERN_INFO "400mA max power\n");
 236                 break;
 237         case 2:
 238                 printk(KERN_INFO "300mA max power\n");
 239                 break;
 240         case 3:
 241                 printk(KERN_INFO "200mA max power\n");
 242                 break;
 243         }
 244
 245         return 0;
 246 }
 247
 248 /* ----------------------------------------------------------- */
 249
 250 /*
 251  * algo_control()
 252  */
 253 static int algo_control(struct i2c_adapter *adapter,
 254                         unsigned int cmd, unsigned long arg)
 255 {
 256         return 0;
 257 }
 258
 259 /*
 260  * functionality()
 261  */
 262 static u32 functionality(struct i2c_adapter *adap)
 263 {
 264         return I2C_FUNC_SMBUS_EMUL;
 265 }
 266
 267 #ifndef I2C_PEC
 268 static void inc_use(struct i2c_adapter *adap)
 269 {
 270         MOD_INC_USE_COUNT;
 271 }
 272
 273 static void dec_use(struct i2c_adapter *adap)
 274 {
 275         MOD_DEC_USE_COUNT;
 276 }
 277 #endif
 278
 279 static int em2820_set_tuner(int check_eeprom, struct i2c_client *client)
 280 {
 281         struct em2820 *dev = client->adapter->algo_data;
 282         struct tuner_setup tun_setup;
 283
 284         if (dev->has_tuner) {
 285                 tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
 286                 tun_setup.type = dev->tuner_type;
 287                 tun_setup.addr = dev->tuner_addr;
 288
 289                 em2820_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);
 290         }
 291
 292         return (0);
 293 }
 294
 295 /*
 296  * attach_inform()
 297  * gets called when a device attaches to the i2c bus
 298  * does some basic configuration
 299  */
 300 static int attach_inform(struct i2c_client *client)
 301 {
 302         struct em2820 *dev = client->adapter->algo_data;
 303
 304         dprintk("address %x", client->addr << 1);
 305         switch (client->addr << 1) {
 306         case 0x68:
 307                 em2820_i2c_call_clients(dev, TDA9887_SET_CONFIG, &dev->tda9887_conf);
 308                 break;
 309         case 0x4a:
 310                 dprintk1("attach_inform: saa7113 detected.\n");
 311                 break;
 312         case 0xa0:
 313                 dprintk1("attach_inform: eeprom detected.\n");
 314                 break;
 315         case 0x80:
 316         case 0x88:
 317                 dprintk1("attach_inform: msp34xx detected.\n");
 318                 break;
 319         case 0xb8:
 320         case 0xba:
 321                 dprintk1("attach_inform: tvp5150 detected.\n");
 322                 break;
 323         default:
 324                 dev->tuner_addr = client->addr;
 325                 em2820_set_tuner(-1, client);
 326         }
 327
 328         return 0;
 329 }
 330
 331 static struct i2c_algorithm em2820_algo = {
 332         .name          = "em2820",
 333         .id            = I2C_HW_B_EM2820,
 334         .master_xfer   = em2820_i2c_xfer,
 335         .algo_control  = algo_control,
 336         .functionality = functionality,
 337 };
 338
 339 static struct i2c_adapter em2820_adap_template = {
 340 #ifdef I2C_PEC
 341         .owner = THIS_MODULE,
 342 #else
 343         .inc_use = inc_use,
 344         .dec_use = dec_use,
 345 #endif
 346 #ifdef I2C_CLASS_TV_ANALOG
 347         .class = I2C_CLASS_TV_ANALOG,
 348 #endif
 349         .name = "em2820",
 350         .id = I2C_HW_B_EM2820,
 351         .algo = &em2820_algo,
 352         .client_register = attach_inform,
 353 };
 354
 355 static struct i2c_client em2820_client_template = {
 356         .name = "em2820 internal",
 357         .flags = I2C_CLIENT_ALLOW_USE,
 358 };
 359
 360 /* ----------------------------------------------------------- */
 361
 362 /*
 363  * i2c_devs
 364  * incomplete list of known devices
 365  */
 366 static char *i2c_devs[128] = {
 367         [0x4a >> 1] = "saa7113h",
 368         [0x60 >> 1] = "remote IR sensor",
 369         [0x86 >> 1] = "tda9887",
 370         [0x80 >> 1] = "msp34xx",
 371         [0x88 >> 1] = "msp34xx",
 372         [0xa0 >> 1] = "eeprom",
 373         [0xb8 >> 1] = "tvp5150a",
 374         [0xba >> 1] = "tvp5150a",
 375         [0xc0 >> 1] = "tuner (analog)",
 376         [0xc2 >> 1] = "tuner (analog)",
 377         [0xc4 >> 1] = "tuner (analog)",
 378         [0xc6 >> 1] = "tuner (analog)",
 379 };
 380
 381 /*
 382  * do_i2c_scan()
 383  * check i2c address range for devices
 384  */
 385 static void do_i2c_scan(char *name, struct i2c_client *c)
 386 {
 387         unsigned char buf;
 388         int i, rc;
 389
 390         for (i = 0; i < 128; i++) {
 391                 c->addr = i;
 392                 rc = i2c_master_recv(c, &buf, 0);
 393                 if (rc < 0)
 394                         continue;
 395                 printk(KERN_INFO "%s: found device @ 0x%x [%s]", name,
 396                        i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 397         }
 398 }
 399
 400 /*
 401  * em2820_i2c_call_clients()
 402  * send commands to all attached i2c devices
 403  */
 404 void em2820_i2c_call_clients(struct em2820 *dev, unsigned int cmd, void *arg)
 405 {
 406         BUG_ON(NULL == dev->i2c_adap.algo_data);
 407         i2c_clients_command(&dev->i2c_adap, cmd, arg);
 408 }
 409
 410 /*
 411  * em2820_i2c_register()
 412  * register i2c bus
 413  */
 414 int em2820_i2c_register(struct em2820 *dev)
 415 {
 416         BUG_ON(!dev->em2820_write_regs || !dev->em2820_read_reg);
 417         BUG_ON(!dev->em2820_write_regs_req || !dev->em2820_read_reg_req);
 418         dev->i2c_adap = em2820_adap_template;
 419         dev->i2c_adap.dev.parent = &dev->udev->dev;
 420         strcpy(dev->i2c_adap.name, dev->name);
 421         dev->i2c_adap.algo_data = dev;
 422         i2c_add_adapter(&dev->i2c_adap);
 423
 424         dev->i2c_client = em2820_client_template;
 425         dev->i2c_client.adapter = &dev->i2c_adap;
 426
 427         em2820_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
 428
 429         if (i2c_scan)
 430                 do_i2c_scan(dev->name, &dev->i2c_client);
 431         return 0;
 432 }
 433
 434 /*
 435  * em2820_i2c_unregister()
 436  * unregister i2c_bus
 437  */
 438 int em2820_i2c_unregister(struct em2820 *dev)
 439 {
 440         i2c_del_adapter(&dev->i2c_adap);
 441         return 0;
 442 }