drivers/media/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
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/videodev2.h>
  21 #include <linux/delay.h>
  22 #include <linux/dvb/frontend.h>
  23 #include <linux/i2c.h>
  24 #include <linux/slab.h>
  25
  26 #include <media/dvb_frontend.h>
  27
  28 #include "max2165.h"
  29 #include "max2165_priv.h"
  30 #include "tuner-i2c.h"
  31
  32 #define dprintk(args...) \
  33         do { \
  34                 if (debug) \
  35                         printk(KERN_DEBUG "max2165: " args); \
  36         } while (0)
  37
  38 static int debug;
  39 module_param(debug, int, 0644);
  40 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  41
  42 static int max2165_write_reg(struct max2165_priv *priv, u8 reg, u8 data)
  43 {
  44         int ret;
  45         u8 buf[] = { reg, data };
  46         struct i2c_msg msg = { .flags = 0, .buf = buf, .len = 2 };
  47
  48         msg.addr = priv->config->i2c_address;
  49
  50         if (debug >= 2)
  51                 dprintk("%s: reg=0x%02X, data=0x%02X\n", __func__, reg, data);
  52
  53         ret = i2c_transfer(priv->i2c, &msg, 1);
  54
  55         if (ret != 1)
  56                 dprintk("%s: error reg=0x%x, data=0x%x, ret=%i\n",
  57                         __func__, reg, data, ret);
  58
  59         return (ret != 1) ? -EIO : 0;
  60 }
  61
  62 static int max2165_read_reg(struct max2165_priv *priv, u8 reg, u8 *p_data)
  63 {
  64         int ret;
  65         u8 dev_addr = priv->config->i2c_address;
  66
  67         u8 b0[] = { reg };
  68         u8 b1[] = { 0 };
  69         struct i2c_msg msg[] = {
  70                 { .addr = dev_addr, .flags = 0, .buf = b0, .len = 1 },
  71                 { .addr = dev_addr, .flags = I2C_M_RD, .buf = b1, .len = 1 },
  72         };
  73
  74         ret = i2c_transfer(priv->i2c, msg, 2);
  75         if (ret != 2) {
  76                 dprintk("%s: error reg=0x%x, ret=%i\n", __func__, reg, ret);
  77                 return -EIO;
  78         }
  79
  80         *p_data = b1[0];
  81         if (debug >= 2)
  82                 dprintk("%s: reg=0x%02X, data=0x%02X\n",
  83                         __func__, reg, b1[0]);
  84         return 0;
  85 }
  86
  87 static int max2165_mask_write_reg(struct max2165_priv *priv, u8 reg,
  88         u8 mask, u8 data)
  89 {
  90         int ret;
  91         u8 v;
  92
  93         data &= mask;
  94         ret = max2165_read_reg(priv, reg, &v);
  95         if (ret != 0)
  96                 return ret;
  97         v &= ~mask;
  98         v |= data;
  99         ret = max2165_write_reg(priv, reg, v);
 100
 101         return ret;
 102 }
 103
 104 static int max2165_read_rom_table(struct max2165_priv *priv)
 105 {
 106         u8 dat[3];
 107         int i;
 108
 109         for (i = 0; i < 3; i++) {
 110                 max2165_write_reg(priv, REG_ROM_TABLE_ADDR, i + 1);
 111                 max2165_read_reg(priv, REG_ROM_TABLE_DATA, &dat[i]);
 112         }
 113
 114         priv->tf_ntch_low_cfg = dat[0] >> 4;
 115         priv->tf_ntch_hi_cfg = dat[0] & 0x0F;
 116         priv->tf_balun_low_ref = dat[1] & 0x0F;
 117         priv->tf_balun_hi_ref = dat[1] >> 4;
 118         priv->bb_filter_7mhz_cfg = dat[2] & 0x0F;
 119         priv->bb_filter_8mhz_cfg = dat[2] >> 4;
 120
 121         dprintk("tf_ntch_low_cfg = 0x%X\n", priv->tf_ntch_low_cfg);
 122         dprintk("tf_ntch_hi_cfg = 0x%X\n", priv->tf_ntch_hi_cfg);
 123         dprintk("tf_balun_low_ref = 0x%X\n", priv->tf_balun_low_ref);
 124         dprintk("tf_balun_hi_ref = 0x%X\n", priv->tf_balun_hi_ref);
 125         dprintk("bb_filter_7mhz_cfg = 0x%X\n", priv->bb_filter_7mhz_cfg);
 126         dprintk("bb_filter_8mhz_cfg = 0x%X\n", priv->bb_filter_8mhz_cfg);
 127
 128         return 0;
 129 }
 130
 131 static int max2165_set_osc(struct max2165_priv *priv, u8 osc /*MHz*/)
 132 {
 133         u8 v;
 134
 135         v = (osc / 2);
 136         if (v == 2)
 137                 v = 0x7;
 138         else
 139                 v -= 8;
 140
 141         max2165_mask_write_reg(priv, REG_PLL_CFG, 0x07, v);
 142
 143         return 0;
 144 }
 145
 146 static int max2165_set_bandwidth(struct max2165_priv *priv, u32 bw)
 147 {
 148         u8 val;
 149
 150         if (bw == 8000000)
 151                 val = priv->bb_filter_8mhz_cfg;
 152         else
 153                 val = priv->bb_filter_7mhz_cfg;
 154
 155         max2165_mask_write_reg(priv, REG_BASEBAND_CTRL, 0xF0, val << 4);
 156
 157         return 0;
 158 }
 159
 160 static int fixpt_div32(u32 dividend, u32 divisor, u32 *quotient, u32 *fraction)
 161 {
 162         u32 remainder;
 163         u32 q, f = 0;
 164         int i;
 165
 166         if (0 == divisor)
 167                 return -EINVAL;
 168
 169         q = dividend / divisor;
 170         remainder = dividend - q * divisor;
 171
 172         for (i = 0; i < 31; i++) {
 173                 remainder <<= 1;
 174                 if (remainder >= divisor) {
 175                         f += 1;
 176                         remainder -= divisor;
 177                 }
 178                 f <<= 1;
 179         }
 180
 181         *quotient = q;
 182         *fraction = f;
 183
 184         return 0;
 185 }
 186
 187 static int max2165_set_rf(struct max2165_priv *priv, u32 freq)
 188 {
 189         u8 tf;
 190         u8 tf_ntch;
 191         u32 t;
 192         u32 quotient, fraction;
 193         int ret;
 194
 195         /* Set PLL divider according to RF frequency */
 196         ret = fixpt_div32(freq / 1000, priv->config->osc_clk * 1000,
 197                          &quotient, &fraction);
 198         if (ret != 0)
 199                 return ret;
 200
 201         /* 20-bit fraction */
 202         fraction >>= 12;
 203
 204         max2165_write_reg(priv, REG_NDIV_INT, quotient);
 205         max2165_mask_write_reg(priv, REG_NDIV_FRAC2, 0x0F, fraction >> 16);
 206         max2165_write_reg(priv, REG_NDIV_FRAC1, fraction >> 8);
 207         max2165_write_reg(priv, REG_NDIV_FRAC0, fraction);
 208
 209         /* Norch Filter */
 210         tf_ntch = (freq < 725000000) ?
 211                 priv->tf_ntch_low_cfg : priv->tf_ntch_hi_cfg;
 212
 213         /* Tracking filter balun */
 214         t = priv->tf_balun_low_ref;
 215         t += (priv->tf_balun_hi_ref - priv->tf_balun_low_ref)
 216                 * (freq / 1000 - 470000) / (780000 - 470000);
 217
 218         tf = t;
 219         dprintk("tf = %X\n", tf);
 220         tf |= tf_ntch << 4;
 221
 222         max2165_write_reg(priv, REG_TRACK_FILTER, tf);
 223
 224         return 0;
 225 }
 226
 227 static void max2165_debug_status(struct max2165_priv *priv)
 228 {
 229         u8 status, autotune;
 230         u8 auto_vco_success, auto_vco_active;
 231         u8 pll_locked;
 232         u8 dc_offset_low, dc_offset_hi;
 233         u8 signal_lv_over_threshold;
 234         u8 vco, vco_sub_band, adc;
 235
 236         max2165_read_reg(priv, REG_STATUS, &status);
 237         max2165_read_reg(priv, REG_AUTOTUNE, &autotune);
 238
 239         auto_vco_success = (status >> 6) & 0x01;
 240         auto_vco_active = (status >> 5) & 0x01;
 241         pll_locked = (status >> 4) & 0x01;
 242         dc_offset_low = (status >> 3) & 0x01;
 243         dc_offset_hi = (status >> 2) & 0x01;
 244         signal_lv_over_threshold = status & 0x01;
 245
 246         vco = autotune >> 6;
 247         vco_sub_band = (autotune >> 3) & 0x7;
 248         adc = autotune & 0x7;
 249
 250         dprintk("auto VCO active: %d, auto VCO success: %d\n",
 251                 auto_vco_active, auto_vco_success);
 252         dprintk("PLL locked: %d\n", pll_locked);
 253         dprintk("DC offset low: %d, DC offset high: %d\n",
 254                 dc_offset_low, dc_offset_hi);
 255         dprintk("Signal lvl over threshold: %d\n", signal_lv_over_threshold);
 256         dprintk("VCO: %d, VCO Sub-band: %d, ADC: %d\n", vco, vco_sub_band, adc);
 257 }
 258
 259 static int max2165_set_params(struct dvb_frontend *fe)
 260 {
 261         struct max2165_priv *priv = fe->tuner_priv;
 262         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 263         int ret;
 264
 265         switch (c->bandwidth_hz) {
 266         case 7000000:
 267         case 8000000:
 268                 priv->frequency = c->frequency;
 269                 break;
 270         default:
 271                 printk(KERN_INFO "MAX2165: bandwidth %d Hz not supported.\n",
 272                        c->bandwidth_hz);
 273                 return -EINVAL;
 274         }
 275
 276         dprintk("%s() frequency=%d\n", __func__, c->frequency);
 277
 278         if (fe->ops.i2c_gate_ctrl)
 279                 fe->ops.i2c_gate_ctrl(fe, 1);
 280         max2165_set_bandwidth(priv, c->bandwidth_hz);
 281         ret = max2165_set_rf(priv, priv->frequency);
 282         mdelay(50);
 283         max2165_debug_status(priv);
 284         if (fe->ops.i2c_gate_ctrl)
 285                 fe->ops.i2c_gate_ctrl(fe, 0);
 286
 287         if (ret != 0)
 288                 return -EREMOTEIO;
 289
 290         return 0;
 291 }
 292
 293 static int max2165_get_frequency(struct dvb_frontend *fe, u32 *freq)
 294 {
 295         struct max2165_priv *priv = fe->tuner_priv;
 296         dprintk("%s()\n", __func__);
 297         *freq = priv->frequency;
 298         return 0;
 299 }
 300
 301 static int max2165_get_bandwidth(struct dvb_frontend *fe, u32 *bw)
 302 {
 303         struct max2165_priv *priv = fe->tuner_priv;
 304         dprintk("%s()\n", __func__);
 305
 306         *bw = priv->bandwidth;
 307         return 0;
 308 }
 309
 310 static int max2165_get_status(struct dvb_frontend *fe, u32 *status)
 311 {
 312         struct max2165_priv *priv = fe->tuner_priv;
 313         u16 lock_status = 0;
 314
 315         dprintk("%s()\n", __func__);
 316
 317         if (fe->ops.i2c_gate_ctrl)
 318                         fe->ops.i2c_gate_ctrl(fe, 1);
 319
 320         max2165_debug_status(priv);
 321         *status = lock_status;
 322
 323         if (fe->ops.i2c_gate_ctrl)
 324                         fe->ops.i2c_gate_ctrl(fe, 0);
 325
 326         return 0;
 327 }
 328
 329 static int max2165_sleep(struct dvb_frontend *fe)
 330 {
 331         dprintk("%s()\n", __func__);
 332         return 0;
 333 }
 334
 335 static int max2165_init(struct dvb_frontend *fe)
 336 {
 337         struct max2165_priv *priv = fe->tuner_priv;
 338         dprintk("%s()\n", __func__);
 339
 340         if (fe->ops.i2c_gate_ctrl)
 341                 fe->ops.i2c_gate_ctrl(fe, 1);
 342
 343         /* Setup initial values */
 344         /* Fractional Mode on */
 345         max2165_write_reg(priv, REG_NDIV_FRAC2, 0x18);
 346         /* LNA on */
 347         max2165_write_reg(priv, REG_LNA, 0x01);
 348         max2165_write_reg(priv, REG_PLL_CFG, 0x7A);
 349         max2165_write_reg(priv, REG_TEST, 0x08);
 350         max2165_write_reg(priv, REG_SHUTDOWN, 0x40);
 351         max2165_write_reg(priv, REG_VCO_CTRL, 0x84);
 352         max2165_write_reg(priv, REG_BASEBAND_CTRL, 0xC3);
 353         max2165_write_reg(priv, REG_DC_OFFSET_CTRL, 0x75);
 354         max2165_write_reg(priv, REG_DC_OFFSET_DAC, 0x00);
 355         max2165_write_reg(priv, REG_ROM_TABLE_ADDR, 0x00);
 356
 357         max2165_set_osc(priv, priv->config->osc_clk);
 358
 359         max2165_read_rom_table(priv);
 360
 361         max2165_set_bandwidth(priv, 8000000);
 362
 363         if (fe->ops.i2c_gate_ctrl)
 364                         fe->ops.i2c_gate_ctrl(fe, 0);
 365
 366         return 0;
 367 }
 368
 369 static void max2165_release(struct dvb_frontend *fe)
 370 {
 371         struct max2165_priv *priv = fe->tuner_priv;
 372         dprintk("%s()\n", __func__);
 373
 374         kfree(priv);
 375         fe->tuner_priv = NULL;
 376 }
 377
 378 static const struct dvb_tuner_ops max2165_tuner_ops = {
 379         .info = {
 380                 .name              = "Maxim MAX2165",
 381                 .frequency_min_hz  = 470 * MHz,
 382                 .frequency_max_hz  = 862 * MHz,
 383                 .frequency_step_hz =  50 * kHz,
 384         },
 385
 386         .release           = max2165_release,
 387         .init              = max2165_init,
 388         .sleep             = max2165_sleep,
 389
 390         .set_params        = max2165_set_params,
 391         .set_analog_params = NULL,
 392         .get_frequency     = max2165_get_frequency,
 393         .get_bandwidth     = max2165_get_bandwidth,
 394         .get_status        = max2165_get_status
 395 };
 396
 397 struct dvb_frontend *max2165_attach(struct dvb_frontend *fe,
 398                                    struct i2c_adapter *i2c,
 399                                    struct max2165_config *cfg)
 400 {
 401         struct max2165_priv *priv = NULL;
 402
 403         dprintk("%s(%d-%04x)\n", __func__,
 404                 i2c ? i2c_adapter_id(i2c) : -1,
 405                 cfg ? cfg->i2c_address : -1);
 406
 407         priv = kzalloc(sizeof(struct max2165_priv), GFP_KERNEL);
 408         if (priv == NULL)
 409                 return NULL;
 410
 411         memcpy(&fe->ops.tuner_ops, &max2165_tuner_ops,
 412                 sizeof(struct dvb_tuner_ops));
 413
 414         priv->config = cfg;
 415         priv->i2c = i2c;
 416         fe->tuner_priv = priv;
 417
 418         max2165_init(fe);
 419         max2165_debug_status(priv);
 420
 421         return fe;
 422 }
 423 EXPORT_SYMBOL(max2165_attach);
 424
 425 MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
 426 MODULE_DESCRIPTION("Maxim MAX2165 silicon tuner driver");
 427 MODULE_LICENSE("GPL");