drivers/media/tuners/mc44s803.c

   1 /*
   2  *  Driver for Freescale MC44S803 Low Power CMOS Broadband Tuner
   3  *
   4  *  Copyright (c) 2009 Jochen Friedrich <jochen@scram.de>
   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/delay.h>
  20 #include <linux/dvb/frontend.h>
  21 #include <linux/i2c.h>
  22 #include <linux/slab.h>
  23
  24 #include "dvb_frontend.h"
  25
  26 #include "mc44s803.h"
  27 #include "mc44s803_priv.h"
  28
  29 #define mc_printk(level, format, arg...)        \
  30         printk(level "mc44s803: " format , ## arg)
  31
  32 /* Writes a single register */
  33 static int mc44s803_writereg(struct mc44s803_priv *priv, u32 val)
  34 {
  35         u8 buf[3];
  36         struct i2c_msg msg = {
  37                 .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 3
  38         };
  39
  40         buf[0] = (val & 0xff0000) >> 16;
  41         buf[1] = (val & 0xff00) >> 8;
  42         buf[2] = (val & 0xff);
  43
  44         if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  45                 mc_printk(KERN_WARNING, "I2C write failed\n");
  46                 return -EREMOTEIO;
  47         }
  48         return 0;
  49 }
  50
  51 /* Reads a single register */
  52 static int mc44s803_readreg(struct mc44s803_priv *priv, u8 reg, u32 *val)
  53 {
  54         u32 wval;
  55         u8 buf[3];
  56         int ret;
  57         struct i2c_msg msg[] = {
  58                 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
  59                   .buf = buf, .len = 3 },
  60         };
  61
  62         wval = MC44S803_REG_SM(MC44S803_REG_DATAREG, MC44S803_ADDR) |
  63                MC44S803_REG_SM(reg, MC44S803_D);
  64
  65         ret = mc44s803_writereg(priv, wval);
  66         if (ret)
  67                 return ret;
  68
  69         if (i2c_transfer(priv->i2c, msg, 1) != 1) {
  70                 mc_printk(KERN_WARNING, "I2C read failed\n");
  71                 return -EREMOTEIO;
  72         }
  73
  74         *val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
  75
  76         return 0;
  77 }
  78
  79 static void mc44s803_release(struct dvb_frontend *fe)
  80 {
  81         struct mc44s803_priv *priv = fe->tuner_priv;
  82
  83         fe->tuner_priv = NULL;
  84         kfree(priv);
  85 }
  86
  87 static int mc44s803_init(struct dvb_frontend *fe)
  88 {
  89         struct mc44s803_priv *priv = fe->tuner_priv;
  90         u32 val;
  91         int err;
  92
  93         if (fe->ops.i2c_gate_ctrl)
  94                 fe->ops.i2c_gate_ctrl(fe, 1);
  95
  96 /* Reset chip */
  97         val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR) |
  98               MC44S803_REG_SM(1, MC44S803_RS);
  99
 100         err = mc44s803_writereg(priv, val);
 101         if (err)
 102                 goto exit;
 103
 104         val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR);
 105
 106         err = mc44s803_writereg(priv, val);
 107         if (err)
 108                 goto exit;
 109
 110 /* Power Up and Start Osc */
 111
 112         val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
 113               MC44S803_REG_SM(0xC0, MC44S803_REFOSC) |
 114               MC44S803_REG_SM(1, MC44S803_OSCSEL);
 115
 116         err = mc44s803_writereg(priv, val);
 117         if (err)
 118                 goto exit;
 119
 120         val = MC44S803_REG_SM(MC44S803_REG_POWER, MC44S803_ADDR) |
 121               MC44S803_REG_SM(0x200, MC44S803_POWER);
 122
 123         err = mc44s803_writereg(priv, val);
 124         if (err)
 125                 goto exit;
 126
 127         msleep(10);
 128
 129         val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
 130               MC44S803_REG_SM(0x40, MC44S803_REFOSC) |
 131               MC44S803_REG_SM(1, MC44S803_OSCSEL);
 132
 133         err = mc44s803_writereg(priv, val);
 134         if (err)
 135                 goto exit;
 136
 137         msleep(20);
 138
 139 /* Setup Mixer */
 140
 141         val = MC44S803_REG_SM(MC44S803_REG_MIXER, MC44S803_ADDR) |
 142               MC44S803_REG_SM(1, MC44S803_TRI_STATE) |
 143               MC44S803_REG_SM(0x7F, MC44S803_MIXER_RES);
 144
 145         err = mc44s803_writereg(priv, val);
 146         if (err)
 147                 goto exit;
 148
 149 /* Setup Cirquit Adjust */
 150
 151         val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
 152               MC44S803_REG_SM(1, MC44S803_G1) |
 153               MC44S803_REG_SM(1, MC44S803_G3) |
 154               MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
 155               MC44S803_REG_SM(1, MC44S803_G6) |
 156               MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
 157               MC44S803_REG_SM(0x3, MC44S803_LP) |
 158               MC44S803_REG_SM(1, MC44S803_CLRF) |
 159               MC44S803_REG_SM(1, MC44S803_CLIF);
 160
 161         err = mc44s803_writereg(priv, val);
 162         if (err)
 163                 goto exit;
 164
 165         val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
 166               MC44S803_REG_SM(1, MC44S803_G1) |
 167               MC44S803_REG_SM(1, MC44S803_G3) |
 168               MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
 169               MC44S803_REG_SM(1, MC44S803_G6) |
 170               MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
 171               MC44S803_REG_SM(0x3, MC44S803_LP);
 172
 173         err = mc44s803_writereg(priv, val);
 174         if (err)
 175                 goto exit;
 176
 177 /* Setup Digtune */
 178
 179         val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
 180               MC44S803_REG_SM(3, MC44S803_XOD);
 181
 182         err = mc44s803_writereg(priv, val);
 183         if (err)
 184                 goto exit;
 185
 186 /* Setup AGC */
 187
 188         val = MC44S803_REG_SM(MC44S803_REG_LNAAGC, MC44S803_ADDR) |
 189               MC44S803_REG_SM(1, MC44S803_AT1) |
 190               MC44S803_REG_SM(1, MC44S803_AT2) |
 191               MC44S803_REG_SM(1, MC44S803_AGC_AN_DIG) |
 192               MC44S803_REG_SM(1, MC44S803_AGC_READ_EN) |
 193               MC44S803_REG_SM(1, MC44S803_LNA0);
 194
 195         err = mc44s803_writereg(priv, val);
 196         if (err)
 197                 goto exit;
 198
 199         if (fe->ops.i2c_gate_ctrl)
 200                 fe->ops.i2c_gate_ctrl(fe, 0);
 201         return 0;
 202
 203 exit:
 204         if (fe->ops.i2c_gate_ctrl)
 205                 fe->ops.i2c_gate_ctrl(fe, 0);
 206
 207         mc_printk(KERN_WARNING, "I/O Error\n");
 208         return err;
 209 }
 210
 211 static int mc44s803_set_params(struct dvb_frontend *fe)
 212 {
 213         struct mc44s803_priv *priv = fe->tuner_priv;
 214         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 215         u32 r1, r2, n1, n2, lo1, lo2, freq, val;
 216         int err;
 217
 218         priv->frequency = c->frequency;
 219
 220         r1 = MC44S803_OSC / 1000000;
 221         r2 = MC44S803_OSC /  100000;
 222
 223         n1 = (c->frequency + MC44S803_IF1 + 500000) / 1000000;
 224         freq = MC44S803_OSC / r1 * n1;
 225         lo1 = ((60 * n1) + (r1 / 2)) / r1;
 226         freq = freq - c->frequency;
 227
 228         n2 = (freq - MC44S803_IF2 + 50000) / 100000;
 229         lo2 = ((60 * n2) + (r2 / 2)) / r2;
 230
 231         if (fe->ops.i2c_gate_ctrl)
 232                 fe->ops.i2c_gate_ctrl(fe, 1);
 233
 234         val = MC44S803_REG_SM(MC44S803_REG_REFDIV, MC44S803_ADDR) |
 235               MC44S803_REG_SM(r1-1, MC44S803_R1) |
 236               MC44S803_REG_SM(r2-1, MC44S803_R2) |
 237               MC44S803_REG_SM(1, MC44S803_REFBUF_EN);
 238
 239         err = mc44s803_writereg(priv, val);
 240         if (err)
 241                 goto exit;
 242
 243         val = MC44S803_REG_SM(MC44S803_REG_LO1, MC44S803_ADDR) |
 244               MC44S803_REG_SM(n1-2, MC44S803_LO1);
 245
 246         err = mc44s803_writereg(priv, val);
 247         if (err)
 248                 goto exit;
 249
 250         val = MC44S803_REG_SM(MC44S803_REG_LO2, MC44S803_ADDR) |
 251               MC44S803_REG_SM(n2-2, MC44S803_LO2);
 252
 253         err = mc44s803_writereg(priv, val);
 254         if (err)
 255                 goto exit;
 256
 257         val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
 258               MC44S803_REG_SM(1, MC44S803_DA) |
 259               MC44S803_REG_SM(lo1, MC44S803_LO_REF) |
 260               MC44S803_REG_SM(1, MC44S803_AT);
 261
 262         err = mc44s803_writereg(priv, val);
 263         if (err)
 264                 goto exit;
 265
 266         val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
 267               MC44S803_REG_SM(2, MC44S803_DA) |
 268               MC44S803_REG_SM(lo2, MC44S803_LO_REF) |
 269               MC44S803_REG_SM(1, MC44S803_AT);
 270
 271         err = mc44s803_writereg(priv, val);
 272         if (err)
 273                 goto exit;
 274
 275         if (fe->ops.i2c_gate_ctrl)
 276                 fe->ops.i2c_gate_ctrl(fe, 0);
 277
 278         return 0;
 279
 280 exit:
 281         if (fe->ops.i2c_gate_ctrl)
 282                 fe->ops.i2c_gate_ctrl(fe, 0);
 283
 284         mc_printk(KERN_WARNING, "I/O Error\n");
 285         return err;
 286 }
 287
 288 static int mc44s803_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 289 {
 290         struct mc44s803_priv *priv = fe->tuner_priv;
 291         *frequency = priv->frequency;
 292         return 0;
 293 }
 294
 295 static int mc44s803_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 296 {
 297         *frequency = MC44S803_IF2; /* 36.125 MHz */
 298         return 0;
 299 }
 300
 301 static const struct dvb_tuner_ops mc44s803_tuner_ops = {
 302         .info = {
 303                 .name           = "Freescale MC44S803",
 304                 .frequency_min  =   48000000,
 305                 .frequency_max  = 1000000000,
 306                 .frequency_step =     100000,
 307         },
 308
 309         .release       = mc44s803_release,
 310         .init          = mc44s803_init,
 311         .set_params    = mc44s803_set_params,
 312         .get_frequency = mc44s803_get_frequency,
 313         .get_if_frequency = mc44s803_get_if_frequency,
 314 };
 315
 316 /* This functions tries to identify a MC44S803 tuner by reading the ID
 317    register. This is hasty. */
 318 struct dvb_frontend *mc44s803_attach(struct dvb_frontend *fe,
 319          struct i2c_adapter *i2c, struct mc44s803_config *cfg)
 320 {
 321         struct mc44s803_priv *priv;
 322         u32 reg;
 323         u8 id;
 324         int ret;
 325
 326         reg = 0;
 327
 328         priv = kzalloc(sizeof(struct mc44s803_priv), GFP_KERNEL);
 329         if (priv == NULL)
 330                 return NULL;
 331
 332         priv->cfg = cfg;
 333         priv->i2c = i2c;
 334         priv->fe  = fe;
 335
 336         if (fe->ops.i2c_gate_ctrl)
 337                 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 338
 339         ret = mc44s803_readreg(priv, MC44S803_REG_ID, &reg);
 340         if (ret)
 341                 goto error;
 342
 343         id = MC44S803_REG_MS(reg, MC44S803_ID);
 344
 345         if (id != 0x14) {
 346                 mc_printk(KERN_ERR, "unsupported ID (%x should be 0x14)\n",
 347                           id);
 348                 goto error;
 349         }
 350
 351         mc_printk(KERN_INFO, "successfully identified (ID = %x)\n", id);
 352         memcpy(&fe->ops.tuner_ops, &mc44s803_tuner_ops,
 353                sizeof(struct dvb_tuner_ops));
 354
 355         fe->tuner_priv = priv;
 356
 357         if (fe->ops.i2c_gate_ctrl)
 358                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 359
 360         return fe;
 361
 362 error:
 363         if (fe->ops.i2c_gate_ctrl)
 364                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 365
 366         kfree(priv);
 367         return NULL;
 368 }
 369 EXPORT_SYMBOL(mc44s803_attach);
 370
 371 MODULE_AUTHOR("Jochen Friedrich");
 372 MODULE_DESCRIPTION("Freescale MC44S803 silicon tuner driver");
 373 MODULE_LICENSE("GPL");