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