drivers/net/wireless/zd1211rw/zd_rf_uw2453.c

   1 /* ZD1211 USB-WLAN driver for Linux
   2  *
   3  * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
   4  * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/slab.h>
  23
  24 #include "zd_rf.h"
  25 #include "zd_usb.h"
  26 #include "zd_chip.h"
  27
  28 /* This RF programming code is based upon the code found in v2.16.0.0 of the
  29  * ZyDAS vendor driver. Unlike other RF's, Ubec publish full technical specs
  30  * for this RF on their website, so we're able to understand more than
  31  * usual as to what is going on. Thumbs up for Ubec for doing that. */
  32
  33 /* The 3-wire serial interface provides access to 8 write-only registers.
  34  * The data format is a 4 bit register address followed by a 20 bit value. */
  35 #define UW2453_REGWRITE(reg, val) ((((reg) & 0xf) << 20) | ((val) & 0xfffff))
  36
  37 /* For channel tuning, we have to configure registers 1 (synthesizer), 2 (synth
  38  * fractional divide ratio) and 3 (VCO config).
  39  *
  40  * We configure the RF to produce an interrupt when the PLL is locked onto
  41  * the configured frequency. During initialization, we run through a variety
  42  * of different VCO configurations on channel 1 until we detect a PLL lock.
  43  * When this happens, we remember which VCO configuration produced the lock
  44  * and use it later. Actually, we use the configuration *after* the one that
  45  * produced the lock, which seems odd, but it works.
  46  *
  47  * If we do not see a PLL lock on any standard VCO config, we fall back on an
  48  * autocal configuration, which has a fixed (as opposed to per-channel) VCO
  49  * config and different synth values from the standard set (divide ratio
  50  * is still shared with the standard set). */
  51
  52 /* The per-channel synth values for all standard VCO configurations. These get
  53  * written to register 1. */
  54 static const u8 uw2453_std_synth[] = {
  55         RF_CHANNEL( 1) = 0x47,
  56         RF_CHANNEL( 2) = 0x47,
  57         RF_CHANNEL( 3) = 0x67,
  58         RF_CHANNEL( 4) = 0x67,
  59         RF_CHANNEL( 5) = 0x67,
  60         RF_CHANNEL( 6) = 0x67,
  61         RF_CHANNEL( 7) = 0x57,
  62         RF_CHANNEL( 8) = 0x57,
  63         RF_CHANNEL( 9) = 0x57,
  64         RF_CHANNEL(10) = 0x57,
  65         RF_CHANNEL(11) = 0x77,
  66         RF_CHANNEL(12) = 0x77,
  67         RF_CHANNEL(13) = 0x77,
  68         RF_CHANNEL(14) = 0x4f,
  69 };
  70
  71 /* This table stores the synthesizer fractional divide ratio for *all* VCO
  72  * configurations (both standard and autocal). These get written to register 2.
  73  */
  74 static const u16 uw2453_synth_divide[] = {
  75         RF_CHANNEL( 1) = 0x999,
  76         RF_CHANNEL( 2) = 0x99b,
  77         RF_CHANNEL( 3) = 0x998,
  78         RF_CHANNEL( 4) = 0x99a,
  79         RF_CHANNEL( 5) = 0x999,
  80         RF_CHANNEL( 6) = 0x99b,
  81         RF_CHANNEL( 7) = 0x998,
  82         RF_CHANNEL( 8) = 0x99a,
  83         RF_CHANNEL( 9) = 0x999,
  84         RF_CHANNEL(10) = 0x99b,
  85         RF_CHANNEL(11) = 0x998,
  86         RF_CHANNEL(12) = 0x99a,
  87         RF_CHANNEL(13) = 0x999,
  88         RF_CHANNEL(14) = 0xccc,
  89 };
  90
  91 /* Here is the data for all the standard VCO configurations. We shrink our
  92  * table a little by observing that both channels in a consecutive pair share
  93  * the same value. We also observe that the high 4 bits ([0:3] in the specs)
  94  * are all 'Reserved' and are always set to 0x4 - we chop them off in the data
  95  * below. */
  96 #define CHAN_TO_PAIRIDX(a) ((a - 1) / 2)
  97 #define RF_CHANPAIR(a,b) [CHAN_TO_PAIRIDX(a)]
  98 static const u16 uw2453_std_vco_cfg[][7] = {
  99         { /* table 1 */
 100                 RF_CHANPAIR( 1,  2) = 0x664d,
 101                 RF_CHANPAIR( 3,  4) = 0x604d,
 102                 RF_CHANPAIR( 5,  6) = 0x6675,
 103                 RF_CHANPAIR( 7,  8) = 0x6475,
 104                 RF_CHANPAIR( 9, 10) = 0x6655,
 105                 RF_CHANPAIR(11, 12) = 0x6455,
 106                 RF_CHANPAIR(13, 14) = 0x6665,
 107         },
 108         { /* table 2 */
 109                 RF_CHANPAIR( 1,  2) = 0x666d,
 110                 RF_CHANPAIR( 3,  4) = 0x606d,
 111                 RF_CHANPAIR( 5,  6) = 0x664d,
 112                 RF_CHANPAIR( 7,  8) = 0x644d,
 113                 RF_CHANPAIR( 9, 10) = 0x6675,
 114                 RF_CHANPAIR(11, 12) = 0x6475,
 115                 RF_CHANPAIR(13, 14) = 0x6655,
 116         },
 117         { /* table 3 */
 118                 RF_CHANPAIR( 1,  2) = 0x665d,
 119                 RF_CHANPAIR( 3,  4) = 0x605d,
 120                 RF_CHANPAIR( 5,  6) = 0x666d,
 121                 RF_CHANPAIR( 7,  8) = 0x646d,
 122                 RF_CHANPAIR( 9, 10) = 0x664d,
 123                 RF_CHANPAIR(11, 12) = 0x644d,
 124                 RF_CHANPAIR(13, 14) = 0x6675,
 125         },
 126         { /* table 4 */
 127                 RF_CHANPAIR( 1,  2) = 0x667d,
 128                 RF_CHANPAIR( 3,  4) = 0x607d,
 129                 RF_CHANPAIR( 5,  6) = 0x665d,
 130                 RF_CHANPAIR( 7,  8) = 0x645d,
 131                 RF_CHANPAIR( 9, 10) = 0x666d,
 132                 RF_CHANPAIR(11, 12) = 0x646d,
 133                 RF_CHANPAIR(13, 14) = 0x664d,
 134         },
 135         { /* table 5 */
 136                 RF_CHANPAIR( 1,  2) = 0x6643,
 137                 RF_CHANPAIR( 3,  4) = 0x6043,
 138                 RF_CHANPAIR( 5,  6) = 0x667d,
 139                 RF_CHANPAIR( 7,  8) = 0x647d,
 140                 RF_CHANPAIR( 9, 10) = 0x665d,
 141                 RF_CHANPAIR(11, 12) = 0x645d,
 142                 RF_CHANPAIR(13, 14) = 0x666d,
 143         },
 144         { /* table 6 */
 145                 RF_CHANPAIR( 1,  2) = 0x6663,
 146                 RF_CHANPAIR( 3,  4) = 0x6063,
 147                 RF_CHANPAIR( 5,  6) = 0x6643,
 148                 RF_CHANPAIR( 7,  8) = 0x6443,
 149                 RF_CHANPAIR( 9, 10) = 0x667d,
 150                 RF_CHANPAIR(11, 12) = 0x647d,
 151                 RF_CHANPAIR(13, 14) = 0x665d,
 152         },
 153         { /* table 7 */
 154                 RF_CHANPAIR( 1,  2) = 0x6653,
 155                 RF_CHANPAIR( 3,  4) = 0x6053,
 156                 RF_CHANPAIR( 5,  6) = 0x6663,
 157                 RF_CHANPAIR( 7,  8) = 0x6463,
 158                 RF_CHANPAIR( 9, 10) = 0x6643,
 159                 RF_CHANPAIR(11, 12) = 0x6443,
 160                 RF_CHANPAIR(13, 14) = 0x667d,
 161         },
 162         { /* table 8 */
 163                 RF_CHANPAIR( 1,  2) = 0x6673,
 164                 RF_CHANPAIR( 3,  4) = 0x6073,
 165                 RF_CHANPAIR( 5,  6) = 0x6653,
 166                 RF_CHANPAIR( 7,  8) = 0x6453,
 167                 RF_CHANPAIR( 9, 10) = 0x6663,
 168                 RF_CHANPAIR(11, 12) = 0x6463,
 169                 RF_CHANPAIR(13, 14) = 0x6643,
 170         },
 171         { /* table 9 */
 172                 RF_CHANPAIR( 1,  2) = 0x664b,
 173                 RF_CHANPAIR( 3,  4) = 0x604b,
 174                 RF_CHANPAIR( 5,  6) = 0x6673,
 175                 RF_CHANPAIR( 7,  8) = 0x6473,
 176                 RF_CHANPAIR( 9, 10) = 0x6653,
 177                 RF_CHANPAIR(11, 12) = 0x6453,
 178                 RF_CHANPAIR(13, 14) = 0x6663,
 179         },
 180         { /* table 10 */
 181                 RF_CHANPAIR( 1,  2) = 0x666b,
 182                 RF_CHANPAIR( 3,  4) = 0x606b,
 183                 RF_CHANPAIR( 5,  6) = 0x664b,
 184                 RF_CHANPAIR( 7,  8) = 0x644b,
 185                 RF_CHANPAIR( 9, 10) = 0x6673,
 186                 RF_CHANPAIR(11, 12) = 0x6473,
 187                 RF_CHANPAIR(13, 14) = 0x6653,
 188         },
 189         { /* table 11 */
 190                 RF_CHANPAIR( 1,  2) = 0x665b,
 191                 RF_CHANPAIR( 3,  4) = 0x605b,
 192                 RF_CHANPAIR( 5,  6) = 0x666b,
 193                 RF_CHANPAIR( 7,  8) = 0x646b,
 194                 RF_CHANPAIR( 9, 10) = 0x664b,
 195                 RF_CHANPAIR(11, 12) = 0x644b,
 196                 RF_CHANPAIR(13, 14) = 0x6673,
 197         },
 198
 199 };
 200
 201 /* The per-channel synth values for autocal. These get written to register 1. */
 202 static const u16 uw2453_autocal_synth[] = {
 203         RF_CHANNEL( 1) = 0x6847,
 204         RF_CHANNEL( 2) = 0x6847,
 205         RF_CHANNEL( 3) = 0x6867,
 206         RF_CHANNEL( 4) = 0x6867,
 207         RF_CHANNEL( 5) = 0x6867,
 208         RF_CHANNEL( 6) = 0x6867,
 209         RF_CHANNEL( 7) = 0x6857,
 210         RF_CHANNEL( 8) = 0x6857,
 211         RF_CHANNEL( 9) = 0x6857,
 212         RF_CHANNEL(10) = 0x6857,
 213         RF_CHANNEL(11) = 0x6877,
 214         RF_CHANNEL(12) = 0x6877,
 215         RF_CHANNEL(13) = 0x6877,
 216         RF_CHANNEL(14) = 0x684f,
 217 };
 218
 219 /* The VCO configuration for autocal (all channels) */
 220 static const u16 UW2453_AUTOCAL_VCO_CFG = 0x6662;
 221
 222 /* TX gain settings. The array index corresponds to the TX power integration
 223  * values found in the EEPROM. The values get written to register 7. */
 224 static u32 uw2453_txgain[] = {
 225         [0x00] = 0x0e313,
 226         [0x01] = 0x0fb13,
 227         [0x02] = 0x0e093,
 228         [0x03] = 0x0f893,
 229         [0x04] = 0x0ea93,
 230         [0x05] = 0x1f093,
 231         [0x06] = 0x1f493,
 232         [0x07] = 0x1f693,
 233         [0x08] = 0x1f393,
 234         [0x09] = 0x1f35b,
 235         [0x0a] = 0x1e6db,
 236         [0x0b] = 0x1ff3f,
 237         [0x0c] = 0x1ffff,
 238         [0x0d] = 0x361d7,
 239         [0x0e] = 0x37fbf,
 240         [0x0f] = 0x3ff8b,
 241         [0x10] = 0x3ff33,
 242         [0x11] = 0x3fb3f,
 243         [0x12] = 0x3ffff,
 244 };
 245
 246 /* RF-specific structure */
 247 struct uw2453_priv {
 248         /* index into synth/VCO config tables where PLL lock was found
 249          * -1 means autocal */
 250         int config;
 251 };
 252
 253 #define UW2453_PRIV(rf) ((struct uw2453_priv *) (rf)->priv)
 254
 255 static int uw2453_synth_set_channel(struct zd_chip *chip, int channel,
 256         bool autocal)
 257 {
 258         int r;
 259         int idx = channel - 1;
 260         u32 val;
 261
 262         if (autocal)
 263                 val = UW2453_REGWRITE(1, uw2453_autocal_synth[idx]);
 264         else
 265                 val = UW2453_REGWRITE(1, uw2453_std_synth[idx]);
 266
 267         r = zd_rfwrite_locked(chip, val, RF_RV_BITS);
 268         if (r)
 269                 return r;
 270
 271         return zd_rfwrite_locked(chip,
 272                 UW2453_REGWRITE(2, uw2453_synth_divide[idx]), RF_RV_BITS);
 273 }
 274
 275 static int uw2453_write_vco_cfg(struct zd_chip *chip, u16 value)
 276 {
 277         /* vendor driver always sets these upper bits even though the specs say
 278          * they are reserved */
 279         u32 val = 0x40000 | value;
 280         return zd_rfwrite_locked(chip, UW2453_REGWRITE(3, val), RF_RV_BITS);
 281 }
 282
 283 static int uw2453_init_mode(struct zd_chip *chip)
 284 {
 285         static const u32 rv[] = {
 286                 UW2453_REGWRITE(0, 0x25f98), /* enter IDLE mode */
 287                 UW2453_REGWRITE(0, 0x25f9a), /* enter CAL_VCO mode */
 288                 UW2453_REGWRITE(0, 0x25f94), /* enter RX/TX mode */
 289                 UW2453_REGWRITE(0, 0x27fd4), /* power down RSSI circuit */
 290         };
 291
 292         return zd_rfwritev_locked(chip, rv, ARRAY_SIZE(rv), RF_RV_BITS);
 293 }
 294
 295 static int uw2453_set_tx_gain_level(struct zd_chip *chip, int channel)
 296 {
 297         u8 int_value = chip->pwr_int_values[channel - 1];
 298
 299         if (int_value >= ARRAY_SIZE(uw2453_txgain)) {
 300                 dev_dbg_f(zd_chip_dev(chip), "can't configure TX gain for "
 301                           "int value %x on channel %d\n", int_value, channel);
 302                 return 0;
 303         }
 304
 305         return zd_rfwrite_locked(chip,
 306                 UW2453_REGWRITE(7, uw2453_txgain[int_value]), RF_RV_BITS);
 307 }
 308
 309 static int uw2453_init_hw(struct zd_rf *rf)
 310 {
 311         int i, r;
 312         int found_config = -1;
 313         u16 intr_status;
 314         struct zd_chip *chip = zd_rf_to_chip(rf);
 315
 316         static const struct zd_ioreq16 ioreqs[] = {
 317                 { CR10,  0x89 }, { CR15,  0x20 },
 318                 { CR17,  0x28 }, /* 6112 no change */
 319                 { CR23,  0x38 }, { CR24,  0x20 }, { CR26,  0x93 },
 320                 { CR27,  0x15 }, { CR28,  0x3e }, { CR29,  0x00 },
 321                 { CR33,  0x28 }, { CR34,  0x30 },
 322                 { CR35,  0x43 }, /* 6112 3e->43 */
 323                 { CR41,  0x24 }, { CR44,  0x32 },
 324                 { CR46,  0x92 }, /* 6112 96->92 */
 325                 { CR47,  0x1e },
 326                 { CR48,  0x04 }, /* 5602 Roger */
 327                 { CR49,  0xfa }, { CR79,  0x58 }, { CR80,  0x30 },
 328                 { CR81,  0x30 }, { CR87,  0x0a }, { CR89,  0x04 },
 329                 { CR91,  0x00 }, { CR92,  0x0a }, { CR98,  0x8d },
 330                 { CR99,  0x28 }, { CR100, 0x02 },
 331                 { CR101, 0x09 }, /* 6112 13->1f 6220 1f->13 6407 13->9 */
 332                 { CR102, 0x27 },
 333                 { CR106, 0x1c }, /* 5d07 5112 1f->1c 6220 1c->1f 6221 1f->1c */
 334                 { CR107, 0x1c }, /* 6220 1c->1a 5221 1a->1c */
 335                 { CR109, 0x13 },
 336                 { CR110, 0x1f }, /* 6112 13->1f 6221 1f->13 6407 13->0x09 */
 337                 { CR111, 0x13 }, { CR112, 0x1f }, { CR113, 0x27 },
 338                 { CR114, 0x23 }, /* 6221 27->23 */
 339                 { CR115, 0x24 }, /* 6112 24->1c 6220 1c->24 */
 340                 { CR116, 0x24 }, /* 6220 1c->24 */
 341                 { CR117, 0xfa }, /* 6112 fa->f8 6220 f8->f4 6220 f4->fa */
 342                 { CR118, 0xf0 }, /* 5d07 6112 f0->f2 6220 f2->f0 */
 343                 { CR119, 0x1a }, /* 6112 1a->10 6220 10->14 6220 14->1a */
 344                 { CR120, 0x4f },
 345                 { CR121, 0x1f }, /* 6220 4f->1f */
 346                 { CR122, 0xf0 }, { CR123, 0x57 }, { CR125, 0xad },
 347                 { CR126, 0x6c }, { CR127, 0x03 },
 348                 { CR128, 0x14 }, /* 6302 12->11 */
 349                 { CR129, 0x12 }, /* 6301 10->0f */
 350                 { CR130, 0x10 }, { CR137, 0x50 }, { CR138, 0xa8 },
 351                 { CR144, 0xac }, { CR146, 0x20 }, { CR252, 0xff },
 352                 { CR253, 0xff },
 353         };
 354
 355         static const u32 rv[] = {
 356                 UW2453_REGWRITE(4, 0x2b),    /* configure receiver gain */
 357                 UW2453_REGWRITE(5, 0x19e4f), /* configure transmitter gain */
 358                 UW2453_REGWRITE(6, 0xf81ad), /* enable RX/TX filter tuning */
 359                 UW2453_REGWRITE(7, 0x3fffe), /* disable TX gain in test mode */
 360
 361                 /* enter CAL_FIL mode, TX gain set by registers, RX gain set by pins,
 362                  * RSSI circuit powered down, reduced RSSI range */
 363                 UW2453_REGWRITE(0, 0x25f9c), /* 5d01 cal_fil */
 364
 365                 /* synthesizer configuration for channel 1 */
 366                 UW2453_REGWRITE(1, 0x47),
 367                 UW2453_REGWRITE(2, 0x999),
 368
 369                 /* disable manual VCO band selection */
 370                 UW2453_REGWRITE(3, 0x7602),
 371
 372                 /* enable manual VCO band selection, configure current level */
 373                 UW2453_REGWRITE(3, 0x46063),
 374         };
 375
 376         r = zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
 377         if (r)
 378                 return r;
 379
 380         r = zd_rfwritev_locked(chip, rv, ARRAY_SIZE(rv), RF_RV_BITS);
 381         if (r)
 382                 return r;
 383
 384         r = uw2453_init_mode(chip);
 385         if (r)
 386                 return r;
 387
 388         /* Try all standard VCO configuration settings on channel 1 */
 389         for (i = 0; i < ARRAY_SIZE(uw2453_std_vco_cfg) - 1; i++) {
 390                 /* Configure synthesizer for channel 1 */
 391                 r = uw2453_synth_set_channel(chip, 1, false);
 392                 if (r)
 393                         return r;
 394
 395                 /* Write VCO config */
 396                 r = uw2453_write_vco_cfg(chip, uw2453_std_vco_cfg[i][0]);
 397                 if (r)
 398                         return r;
 399
 400                 /* ack interrupt event */
 401                 r = zd_iowrite16_locked(chip, 0x0f, UW2453_INTR_REG);
 402                 if (r)
 403                         return r;
 404
 405                 /* check interrupt status */
 406                 r = zd_ioread16_locked(chip, &intr_status, UW2453_INTR_REG);
 407                 if (r)
 408                         return r;
 409
 410                 if (!(intr_status & 0xf)) {
 411                         dev_dbg_f(zd_chip_dev(chip),
 412                                 "PLL locked on configuration %d\n", i);
 413                         found_config = i;
 414                         break;
 415                 }
 416         }
 417
 418         if (found_config == -1) {
 419                 /* autocal */
 420                 dev_dbg_f(zd_chip_dev(chip),
 421                         "PLL did not lock, using autocal\n");
 422
 423                 r = uw2453_synth_set_channel(chip, 1, true);
 424                 if (r)
 425                         return r;
 426
 427                 r = uw2453_write_vco_cfg(chip, UW2453_AUTOCAL_VCO_CFG);
 428                 if (r)
 429                         return r;
 430         }
 431
 432         /* To match the vendor driver behaviour, we use the configuration after
 433          * the one that produced a lock. */
 434         UW2453_PRIV(rf)->config = found_config + 1;
 435
 436         return zd_iowrite16_locked(chip, 0x06, CR203);
 437 }
 438
 439 static int uw2453_set_channel(struct zd_rf *rf, u8 channel)
 440 {
 441         int r;
 442         u16 vco_cfg;
 443         int config = UW2453_PRIV(rf)->config;
 444         bool autocal = (config == -1);
 445         struct zd_chip *chip = zd_rf_to_chip(rf);
 446
 447         static const struct zd_ioreq16 ioreqs[] = {
 448                 { CR80,  0x30 }, { CR81,  0x30 }, { CR79,  0x58 },
 449                 { CR12,  0xf0 }, { CR77,  0x1b }, { CR78,  0x58 },
 450         };
 451
 452         r = uw2453_synth_set_channel(chip, channel, autocal);
 453         if (r)
 454                 return r;
 455
 456         if (autocal)
 457                 vco_cfg = UW2453_AUTOCAL_VCO_CFG;
 458         else
 459                 vco_cfg = uw2453_std_vco_cfg[config][CHAN_TO_PAIRIDX(channel)];
 460
 461         r = uw2453_write_vco_cfg(chip, vco_cfg);
 462         if (r)
 463                 return r;
 464
 465         r = uw2453_init_mode(chip);
 466         if (r)
 467                 return r;
 468
 469         r = zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
 470         if (r)
 471                 return r;
 472
 473         r = uw2453_set_tx_gain_level(chip, channel);
 474         if (r)
 475                 return r;
 476
 477         return zd_iowrite16_locked(chip, 0x06, CR203);
 478 }
 479
 480 static int uw2453_switch_radio_on(struct zd_rf *rf)
 481 {
 482         int r;
 483         struct zd_chip *chip = zd_rf_to_chip(rf);
 484         struct zd_ioreq16 ioreqs[] = {
 485                 { CR11,  0x00 }, { CR251, 0x3f },
 486         };
 487
 488         /* enter RXTX mode */
 489         r = zd_rfwrite_locked(chip, UW2453_REGWRITE(0, 0x25f94), RF_RV_BITS);
 490         if (r)
 491                 return r;
 492
 493         if (zd_chip_is_zd1211b(chip))
 494                 ioreqs[1].value = 0x7f;
 495
 496         return zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
 497 }
 498
 499 static int uw2453_switch_radio_off(struct zd_rf *rf)
 500 {
 501         int r;
 502         struct zd_chip *chip = zd_rf_to_chip(rf);
 503         static const struct zd_ioreq16 ioreqs[] = {
 504                 { CR11,  0x04 }, { CR251, 0x2f },
 505         };
 506
 507         /* enter IDLE mode */
 508         /* FIXME: shouldn't we go to SLEEP? sent email to zydas */
 509         r = zd_rfwrite_locked(chip, UW2453_REGWRITE(0, 0x25f90), RF_RV_BITS);
 510         if (r)
 511                 return r;
 512
 513         return zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs));
 514 }
 515
 516 static void uw2453_clear(struct zd_rf *rf)
 517 {
 518         kfree(rf->priv);
 519 }
 520
 521 int zd_rf_init_uw2453(struct zd_rf *rf)
 522 {
 523         rf->init_hw = uw2453_init_hw;
 524         rf->set_channel = uw2453_set_channel;
 525         rf->switch_radio_on = uw2453_switch_radio_on;
 526         rf->switch_radio_off = uw2453_switch_radio_off;
 527         rf->patch_6m_band_edge = zd_rf_generic_patch_6m;
 528         rf->clear = uw2453_clear;
 529         /* we have our own TX integration code */
 530         rf->update_channel_int = 0;
 531
 532         rf->priv = kmalloc(sizeof(struct uw2453_priv), GFP_KERNEL);
 533         if (rf->priv == NULL)
 534                 return -ENOMEM;
 535
 536         return 0;
 537 }
 538