release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/media/common/tuners/max2165.c

   1 /*
   2  *  Driver for Maxim MAX2165 silicon tuner
   3  *
   4  *  Copyright (c) 2009 David T. L. Wong <davidtlwong@gmail.com>
   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  *
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/videodev2.h>
  25 #include <linux/delay.h>
  26 #include <linux/dvb/frontend.h>
  27 #include <linux/i2c.h>
  28 #include <linux/slab.h>
  29
  30 #include "dvb_frontend.h"
  31
  32 #include "max2165.h"
  33 #include "max2165_priv.h"
  34 #include "tuner-i2c.h"
  35
  36 #define dprintk(args...) \
  37         do { \
  38                 if (debug) \
  39                         printk(KERN_DEBUG "max2165: " args); \
  40         } while (0)
  41
  42 static int debug;
  43 module_param(debug, int, 0644);
  44 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  45
  46 static int max2165_write_reg(struct max2165_priv *priv, u8 reg, u8 data)
  47 {
  48         int ret;
  49         u8 buf[] = { reg, data };
  50         struct i2c_msg msg = { .flags = 0, .buf = buf, .len = 2 };
  51
  52         msg.addr = priv->config->i2c_address;
  53
  54         if (debug >= 2)
  55                 printk(KERN_DEBUG "%s: reg=0x%02X, data=0x%02X\n",
  56                         __func__, reg, data);
  57
  58         ret = i2c_transfer(priv->i2c, &msg, 1);
  59
  60         if (ret != 1)
  61                 dprintk(KERN_DEBUG "%s: error reg=0x%x, data=0x%x, ret=%i\n",
  62                         __func__, reg, data, ret);
  63
  64         return (ret != 1) ? -EIO : 0;
  65 }
  66
  67 static int max2165_read_reg(struct max2165_priv *priv, u8 reg, u8 *p_data)
  68 {
  69         int ret;
  70         u8 dev_addr = priv->config->i2c_address;
  71
  72         u8 b0[] = { reg };
  73         u8 b1[] = { 0 };
  74         struct i2c_msg msg[] = {
  75                 { .addr = dev_addr, .flags = 0, .buf = b0, .len = 1 },
  76                 { .addr = dev_addr, .flags = I2C_M_RD, .buf = b1, .len = 1 },
  77         };
  78
  79         ret = i2c_transfer(priv->i2c, msg, 2);
  80         if (ret != 2) {
  81                 dprintk(KERN_DEBUG "%s: error reg=0x%x, ret=%i\n",
  82                         __func__, reg, ret);
  83                 return -EIO;
  84         }
  85
  86         *p_data = b1[0];
  87         if (debug >= 2)
  88                 printk(KERN_DEBUG "%s: reg=0x%02X, data=0x%02X\n",
  89                         __func__, reg, b1[0]);
  90         return 0;
  91 }
  92
  93 static int max2165_mask_write_reg(struct max2165_priv *priv, u8 reg,
  94         u8 mask, u8 data)
  95 {
  96         int ret;
  97         u8 v;
  98
  99         data &= mask;
 100         ret = max2165_read_reg(priv, reg, &v);
 101         if (ret != 0)
 102                 return ret;
 103         v &= ~mask;
 104         v |= data;
 105         ret = max2165_write_reg(priv, reg, v);
 106
 107         return ret;
 108 }
 109
 110 static int max2165_read_rom_table(struct max2165_priv *priv)
 111 {
 112         u8 dat[3];
 113         int i;
 114
 115         for (i = 0; i < 3; i++) {
 116                 max2165_write_reg(priv, REG_ROM_TABLE_ADDR, i + 1);
 117                 max2165_read_reg(priv, REG_ROM_TABLE_DATA, &dat[i]);
 118         }
 119
 120         priv->tf_ntch_low_cfg = dat[0] >> 4;
 121         priv->tf_ntch_hi_cfg = dat[0] & 0x0F;
 122         priv->tf_balun_low_ref = dat[1] & 0x0F;
 123         priv->tf_balun_hi_ref = dat[1] >> 4;
 124         priv->bb_filter_7mhz_cfg = dat[2] & 0x0F;
 125         priv->bb_filter_8mhz_cfg = dat[2] >> 4;
 126
 127         dprintk("tf_ntch_low_cfg = 0x%X\n", priv->tf_ntch_low_cfg);
 128         dprintk("tf_ntch_hi_cfg = 0x%X\n", priv->tf_ntch_hi_cfg);
 129         dprintk("tf_balun_low_ref = 0x%X\n", priv->tf_balun_low_ref);
 130         dprintk("tf_balun_hi_ref = 0x%X\n", priv->tf_balun_hi_ref);
 131         dprintk("bb_filter_7mhz_cfg = 0x%X\n", priv->bb_filter_7mhz_cfg);
 132         dprintk("bb_filter_8mhz_cfg = 0x%X\n", priv->bb_filter_8mhz_cfg);
 133
 134         return 0;
 135 }
 136
 137 static int max2165_set_osc(struct max2165_priv *priv, u8 osc /*MHz*/)
 138 {
 139         u8 v;
 140
 141         v = (osc / 2);
 142         if (v == 2)
 143                 v = 0x7;
 144         else
 145                 v -= 8;
 146
 147         max2165_mask_write_reg(priv, REG_PLL_CFG, 0x07, v);
 148
 149         return 0;
 150 }
 151
 152 static int max2165_set_bandwidth(struct max2165_priv *priv, u32 bw)
 153 {
 154         u8 val;
 155
 156         if (bw == BANDWIDTH_8_MHZ)
 157                 val = priv->bb_filter_8mhz_cfg;
 158         else
 159                 val = priv->bb_filter_7mhz_cfg;
 160
 161         max2165_mask_write_reg(priv, REG_BASEBAND_CTRL, 0xF0, val << 4);
 162
 163         return 0;
 164 }
 165
 166 int fixpt_div32(u32 dividend, u32 divisor, u32 *quotient, u32 *fraction)
 167 {
 168         u32 remainder;
 169         u32 q, f = 0;
 170         int i;
 171
 172         if (0 == divisor)
 173                 return -1;
 174
 175         q = dividend / divisor;
 176         remainder = dividend - q * divisor;
 177
 178         for (i = 0; i < 31; i++) {
 179                 remainder <<= 1;
 180                 if (remainder >= divisor) {
 181                         f += 1;
 182                         remainder -= divisor;
 183                 }
 184                 f <<= 1;
 185         }
 186
 187         *quotient = q;
 188         *fraction = f;
 189
 190         return 0;
 191 }
 192
 193 static int max2165_set_rf(struct max2165_priv *priv, u32 freq)
 194 {
 195         u8 tf;
 196         u8 tf_ntch;
 197         u32 t;
 198         u32 quotient, fraction;
 199
 200         /* Set PLL divider according to RF frequency */
 201         fixpt_div32(freq / 1000, priv->config->osc_clk * 1000,
 202                 &quotient, &fraction);
 203
 204         /* 20-bit fraction */
 205         fraction >>= 12;
 206
 207         max2165_write_reg(priv, REG_NDIV_INT, quotient);
 208         max2165_mask_write_reg(priv, REG_NDIV_FRAC2, 0x0F, fraction >> 16);
 209         max2165_write_reg(priv, REG_NDIV_FRAC1, fraction >> 8);
 210         max2165_write_reg(priv, REG_NDIV_FRAC0, fraction);
 211
 212         /* Norch Filter */
 213         tf_ntch = (freq < 725000000) ?
 214                 priv->tf_ntch_low_cfg : priv->tf_ntch_hi_cfg;
 215
 216         /* Tracking filter balun */
 217         t = priv->tf_balun_low_ref;
 218         t += (priv->tf_balun_hi_ref - priv->tf_balun_low_ref)
 219                 * (freq / 1000 - 470000) / (780000 - 470000);
 220
 221         tf = t;
 222         dprintk("tf = %X\n", tf);
 223         tf |= tf_ntch << 4;
 224
 225         max2165_write_reg(priv, REG_TRACK_FILTER, tf);
 226
 227         return 0;
 228 }
 229
 230 static void max2165_debug_status(struct max2165_priv *priv)
 231 {
 232         u8 status, autotune;
 233         u8 auto_vco_success, auto_vco_active;
 234         u8 pll_locked;
 235         u8 dc_offset_low, dc_offset_hi;
 236         u8 signal_lv_over_threshold;
 237         u8 vco, vco_sub_band, adc;
 238
 239         max2165_read_reg(priv, REG_STATUS, &status);
 240         max2165_read_reg(priv, REG_AUTOTUNE, &autotune);
 241
 242         auto_vco_success = (status >> 6) & 0x01;
 243         auto_vco_active = (status >> 5) & 0x01;
 244         pll_locked = (status >> 4) & 0x01;
 245         dc_offset_low = (status >> 3) & 0x01;
 246         dc_offset_hi = (status >> 2) & 0x01;
 247         signal_lv_over_threshold = status & 0x01;
 248
 249         vco = autotune >> 6;
 250         vco_sub_band = (autotune >> 3) & 0x7;
 251         adc = autotune & 0x7;
 252
 253         dprintk("auto VCO active: %d, auto VCO success: %d\n",
 254                 auto_vco_active, auto_vco_success);
 255         dprintk("PLL locked: %d\n", pll_locked);
 256         dprintk("DC offset low: %d, DC offset high: %d\n",
 257                 dc_offset_low, dc_offset_hi);
 258         dprintk("Signal lvl over threshold: %d\n", signal_lv_over_threshold);
 259         dprintk("VCO: %d, VCO Sub-band: %d, ADC: %d\n", vco, vco_sub_band, adc);
 260 }
 261
 262 static int max2165_set_params(struct dvb_frontend *fe,
 263         struct dvb_frontend_parameters *params)
 264 {
 265         struct max2165_priv *priv = fe->tuner_priv;
 266         int ret;
 267
 268         dprintk("%s() frequency=%d (Hz)\n", __func__, params->frequency);
 269         if (fe->ops.info.type == FE_ATSC) {
 270                         return -EINVAL;
 271         } else if (fe->ops.info.type == FE_OFDM) {
 272                 dprintk("%s() OFDM\n", __func__);
 273                 switch (params->u.ofdm.bandwidth) {
 274                 case BANDWIDTH_6_MHZ:
 275                         return -EINVAL;
 276                 case BANDWIDTH_7_MHZ:
 277                 case BANDWIDTH_8_MHZ:
 278                         priv->frequency = params->frequency;
 279                         priv->bandwidth = params->u.ofdm.bandwidth;
 280                         break;
 281                 default:
 282                         printk(KERN_ERR "MAX2165 bandwidth not set!\n");
 283                         return -EINVAL;
 284                 }
 285         } else {
 286                 printk(KERN_ERR "MAX2165 modulation type not supported!\n");
 287                 return -EINVAL;
 288         }
 289
 290         dprintk("%s() frequency=%d\n", __func__, priv->frequency);
 291
 292         if (fe->ops.i2c_gate_ctrl)
 293                 fe->ops.i2c_gate_ctrl(fe, 1);
 294         max2165_set_bandwidth(priv, priv->bandwidth);
 295         ret = max2165_set_rf(priv, priv->frequency);
 296         mdelay(50);
 297         max2165_debug_status(priv);
 298         if (fe->ops.i2c_gate_ctrl)
 299                 fe->ops.i2c_gate_ctrl(fe, 0);
 300
 301         if (ret != 0)
 302                 return -EREMOTEIO;
 303
 304         return 0;
 305 }
 306
 307 static int max2165_get_frequency(struct dvb_frontend *fe, u32 *freq)
 308 {
 309         struct max2165_priv *priv = fe->tuner_priv;
 310         dprintk("%s()\n", __func__);
 311         *freq = priv->frequency;
 312         return 0;
 313 }
 314
 315 static int max2165_get_bandwidth(struct dvb_frontend *fe, u32 *bw)
 316 {
 317         struct max2165_priv *priv = fe->tuner_priv;
 318         dprintk("%s()\n", __func__);
 319
 320         *bw = priv->bandwidth;
 321         return 0;
 322 }
 323
 324 static int max2165_get_status(struct dvb_frontend *fe, u32 *status)
 325 {
 326         struct max2165_priv *priv = fe->tuner_priv;
 327         u16 lock_status = 0;
 328
 329         dprintk("%s()\n", __func__);
 330
 331         if (fe->ops.i2c_gate_ctrl)
 332                         fe->ops.i2c_gate_ctrl(fe, 1);
 333
 334         max2165_debug_status(priv);
 335         *status = lock_status;
 336
 337         if (fe->ops.i2c_gate_ctrl)
 338                         fe->ops.i2c_gate_ctrl(fe, 0);
 339
 340         return 0;
 341 }
 342
 343 static int max2165_sleep(struct dvb_frontend *fe)
 344 {
 345         dprintk("%s()\n", __func__);
 346         return 0;
 347 }
 348
 349 static int max2165_init(struct dvb_frontend *fe)
 350 {
 351         struct max2165_priv *priv = fe->tuner_priv;
 352         dprintk("%s()\n", __func__);
 353
 354         if (fe->ops.i2c_gate_ctrl)
 355                 fe->ops.i2c_gate_ctrl(fe, 1);
 356
 357         /* Setup initial values */
 358         /* Fractional Mode on */
 359         max2165_write_reg(priv, REG_NDIV_FRAC2, 0x18);
 360         /* LNA on */
 361         max2165_write_reg(priv, REG_LNA, 0x01);
 362         max2165_write_reg(priv, REG_PLL_CFG, 0x7A);
 363         max2165_write_reg(priv, REG_TEST, 0x08);
 364         max2165_write_reg(priv, REG_SHUTDOWN, 0x40);
 365         max2165_write_reg(priv, REG_VCO_CTRL, 0x84);
 366         max2165_write_reg(priv, REG_BASEBAND_CTRL, 0xC3);
 367         max2165_write_reg(priv, REG_DC_OFFSET_CTRL, 0x75);
 368         max2165_write_reg(priv, REG_DC_OFFSET_DAC, 0x00);
 369         max2165_write_reg(priv, REG_ROM_TABLE_ADDR, 0x00);
 370
 371         max2165_set_osc(priv, priv->config->osc_clk);
 372
 373         max2165_read_rom_table(priv);
 374
 375         max2165_set_bandwidth(priv, BANDWIDTH_8_MHZ);
 376
 377         if (fe->ops.i2c_gate_ctrl)
 378                         fe->ops.i2c_gate_ctrl(fe, 0);
 379
 380         return 0;
 381 }
 382
 383 static int max2165_release(struct dvb_frontend *fe)
 384 {
 385         struct max2165_priv *priv = fe->tuner_priv;
 386         dprintk("%s()\n", __func__);
 387
 388         kfree(priv);
 389         fe->tuner_priv = NULL;
 390
 391         return 0;
 392 }
 393
 394 static const struct dvb_tuner_ops max2165_tuner_ops = {
 395         .info = {
 396                 .name           = "Maxim MAX2165",
 397                 .frequency_min  = 470000000,
 398                 .frequency_max  = 780000000,
 399                 .frequency_step =     50000,
 400         },
 401
 402         .release           = max2165_release,
 403         .init              = max2165_init,
 404         .sleep             = max2165_sleep,
 405
 406         .set_params        = max2165_set_params,
 407         .set_analog_params = NULL,
 408         .get_frequency     = max2165_get_frequency,
 409         .get_bandwidth     = max2165_get_bandwidth,
 410         .get_status        = max2165_get_status
 411 };
 412
 413 struct dvb_frontend *max2165_attach(struct dvb_frontend *fe,
 414                                    struct i2c_adapter *i2c,
 415                                    struct max2165_config *cfg)
 416 {
 417         struct max2165_priv *priv = NULL;
 418
 419         dprintk("%s(%d-%04x)\n", __func__,
 420                 i2c ? i2c_adapter_id(i2c) : -1,
 421                 cfg ? cfg->i2c_address : -1);
 422
 423         priv = kzalloc(sizeof(struct max2165_priv), GFP_KERNEL);
 424         if (priv == NULL)
 425                 return NULL;
 426
 427         memcpy(&fe->ops.tuner_ops, &max2165_tuner_ops,
 428                 sizeof(struct dvb_tuner_ops));
 429
 430         priv->config = cfg;
 431         priv->i2c = i2c;
 432         fe->tuner_priv = priv;
 433
 434         max2165_init(fe);
 435         max2165_debug_status(priv);
 436
 437         return fe;
 438 }
 439 EXPORT_SYMBOL(max2165_attach);
 440
 441 MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
 442 MODULE_DESCRIPTION("Maxim MAX2165 silicon tuner driver");
 443 MODULE_LICENSE("GPL");