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  *  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 #include <linux/slab.h>
  27
  28 #include "dvb_frontend.h"
  29
  30 #include "mc44s803.h"
  31 #include "mc44s803_priv.h"
  32
  33 #define mc_printk(level, format, arg...)        \
  34         printk(level "mc44s803: " format , ## arg)
  35
  36 /* Writes a single register */
  37 static int mc44s803_writereg(struct mc44s803_priv *priv, u32 val)
  38 {
  39         u8 buf[3];
  40         struct i2c_msg msg = {
  41                 .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 3
  42         };
  43
  44         buf[0] = (val & 0xff0000) >> 16;
  45         buf[1] = (val & 0xff00) >> 8;
  46         buf[2] = (val & 0xff);
  47
  48         if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  49                 mc_printk(KERN_WARNING, "I2C write failed\n");
  50                 return -EREMOTEIO;
  51         }
  52         return 0;
  53 }
  54
  55 /* Reads a single register */
  56 static int mc44s803_readreg(struct mc44s803_priv *priv, u8 reg, u32 *val)
  57 {
  58         u32 wval;
  59         u8 buf[3];
  60         int ret;
  61         struct i2c_msg msg[] = {
  62                 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
  63                   .buf = buf, .len = 3 },
  64         };
  65
  66         wval = MC44S803_REG_SM(MC44S803_REG_DATAREG, MC44S803_ADDR) |
  67                MC44S803_REG_SM(reg, MC44S803_D);
  68
  69         ret = mc44s803_writereg(priv, wval);
  70         if (ret)
  71                 return ret;
  72
  73         if (i2c_transfer(priv->i2c, msg, 1) != 1) {
  74                 mc_printk(KERN_WARNING, "I2C read failed\n");
  75                 return -EREMOTEIO;
  76         }
  77
  78         *val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
  79
  80         return 0;
  81 }
  82
  83 static int mc44s803_release(struct dvb_frontend *fe)
  84 {
  85         struct mc44s803_priv *priv = fe->tuner_priv;
  86
  87         fe->tuner_priv = NULL;
  88         kfree(priv);
  89
  90         return 0;
  91 }
  92
  93 static int mc44s803_init(struct dvb_frontend *fe)
  94 {
  95         struct mc44s803_priv *priv = fe->tuner_priv;
  96         u32 val;
  97         int err;
  98
  99         if (fe->ops.i2c_gate_ctrl)
 100                 fe->ops.i2c_gate_ctrl(fe, 1);
 101
 102 /* Reset chip */
 103         val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR) |
 104               MC44S803_REG_SM(1, MC44S803_RS);
 105
 106         err = mc44s803_writereg(priv, val);
 107         if (err)
 108                 goto exit;
 109
 110         val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR);
 111
 112         err = mc44s803_writereg(priv, val);
 113         if (err)
 114                 goto exit;
 115
 116 /* Power Up and Start Osc */
 117
 118         val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
 119               MC44S803_REG_SM(0xC0, MC44S803_REFOSC) |
 120               MC44S803_REG_SM(1, MC44S803_OSCSEL);
 121
 122         err = mc44s803_writereg(priv, val);
 123         if (err)
 124                 goto exit;
 125
 126         val = MC44S803_REG_SM(MC44S803_REG_POWER, MC44S803_ADDR) |
 127               MC44S803_REG_SM(0x200, MC44S803_POWER);
 128
 129         err = mc44s803_writereg(priv, val);
 130         if (err)
 131                 goto exit;
 132
 133         msleep(10);
 134
 135         val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
 136               MC44S803_REG_SM(0x40, MC44S803_REFOSC) |
 137               MC44S803_REG_SM(1, MC44S803_OSCSEL);
 138
 139         err = mc44s803_writereg(priv, val);
 140         if (err)
 141                 goto exit;
 142
 143         msleep(20);
 144
 145 /* Setup Mixer */
 146
 147         val = MC44S803_REG_SM(MC44S803_REG_MIXER, MC44S803_ADDR) |
 148               MC44S803_REG_SM(1, MC44S803_TRI_STATE) |
 149               MC44S803_REG_SM(0x7F, MC44S803_MIXER_RES);
 150
 151         err = mc44s803_writereg(priv, val);
 152         if (err)
 153                 goto exit;
 154
 155 /* Setup Cirquit Adjust */
 156
 157         val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
 158               MC44S803_REG_SM(1, MC44S803_G1) |
 159               MC44S803_REG_SM(1, MC44S803_G3) |
 160               MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
 161               MC44S803_REG_SM(1, MC44S803_G6) |
 162               MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
 163               MC44S803_REG_SM(0x3, MC44S803_LP) |
 164               MC44S803_REG_SM(1, MC44S803_CLRF) |
 165               MC44S803_REG_SM(1, MC44S803_CLIF);
 166
 167         err = mc44s803_writereg(priv, val);
 168         if (err)
 169                 goto exit;
 170
 171         val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
 172               MC44S803_REG_SM(1, MC44S803_G1) |
 173               MC44S803_REG_SM(1, MC44S803_G3) |
 174               MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
 175               MC44S803_REG_SM(1, MC44S803_G6) |
 176               MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
 177               MC44S803_REG_SM(0x3, MC44S803_LP);
 178
 179         err = mc44s803_writereg(priv, val);
 180         if (err)
 181                 goto exit;
 182
 183 /* Setup Digtune */
 184
 185         val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
 186               MC44S803_REG_SM(3, MC44S803_XOD);
 187
 188         err = mc44s803_writereg(priv, val);
 189         if (err)
 190                 goto exit;
 191
 192 /* Setup AGC */
 193
 194         val = MC44S803_REG_SM(MC44S803_REG_LNAAGC, MC44S803_ADDR) |
 195               MC44S803_REG_SM(1, MC44S803_AT1) |
 196               MC44S803_REG_SM(1, MC44S803_AT2) |
 197               MC44S803_REG_SM(1, MC44S803_AGC_AN_DIG) |
 198               MC44S803_REG_SM(1, MC44S803_AGC_READ_EN) |
 199               MC44S803_REG_SM(1, MC44S803_LNA0);
 200
 201         err = mc44s803_writereg(priv, val);
 202         if (err)
 203                 goto exit;
 204
 205         if (fe->ops.i2c_gate_ctrl)
 206                 fe->ops.i2c_gate_ctrl(fe, 0);
 207         return 0;
 208
 209 exit:
 210         if (fe->ops.i2c_gate_ctrl)
 211                 fe->ops.i2c_gate_ctrl(fe, 0);
 212
 213         mc_printk(KERN_WARNING, "I/O Error\n");
 214         return err;
 215 }
 216
 217 static int mc44s803_set_params(struct dvb_frontend *fe)
 218 {
 219         struct mc44s803_priv *priv = fe->tuner_priv;
 220         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 221         u32 r1, r2, n1, n2, lo1, lo2, freq, val;
 222         int err;
 223
 224         priv->frequency = c->frequency;
 225
 226         r1 = MC44S803_OSC / 1000000;
 227         r2 = MC44S803_OSC /  100000;
 228
 229         n1 = (c->frequency + MC44S803_IF1 + 500000) / 1000000;
 230         freq = MC44S803_OSC / r1 * n1;
 231         lo1 = ((60 * n1) + (r1 / 2)) / r1;
 232         freq = freq - c->frequency;
 233
 234         n2 = (freq - MC44S803_IF2 + 50000) / 100000;
 235         lo2 = ((60 * n2) + (r2 / 2)) / r2;
 236
 237         if (fe->ops.i2c_gate_ctrl)
 238                 fe->ops.i2c_gate_ctrl(fe, 1);
 239
 240         val = MC44S803_REG_SM(MC44S803_REG_REFDIV, MC44S803_ADDR) |
 241               MC44S803_REG_SM(r1-1, MC44S803_R1) |
 242               MC44S803_REG_SM(r2-1, MC44S803_R2) |
 243               MC44S803_REG_SM(1, MC44S803_REFBUF_EN);
 244
 245         err = mc44s803_writereg(priv, val);
 246         if (err)
 247                 goto exit;
 248
 249         val = MC44S803_REG_SM(MC44S803_REG_LO1, MC44S803_ADDR) |
 250               MC44S803_REG_SM(n1-2, MC44S803_LO1);
 251
 252         err = mc44s803_writereg(priv, val);
 253         if (err)
 254                 goto exit;
 255
 256         val = MC44S803_REG_SM(MC44S803_REG_LO2, MC44S803_ADDR) |
 257               MC44S803_REG_SM(n2-2, MC44S803_LO2);
 258
 259         err = mc44s803_writereg(priv, val);
 260         if (err)
 261                 goto exit;
 262
 263         val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
 264               MC44S803_REG_SM(1, MC44S803_DA) |
 265               MC44S803_REG_SM(lo1, MC44S803_LO_REF) |
 266               MC44S803_REG_SM(1, MC44S803_AT);
 267
 268         err = mc44s803_writereg(priv, val);
 269         if (err)
 270                 goto exit;
 271
 272         val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
 273               MC44S803_REG_SM(2, MC44S803_DA) |
 274               MC44S803_REG_SM(lo2, MC44S803_LO_REF) |
 275               MC44S803_REG_SM(1, MC44S803_AT);
 276
 277         err = mc44s803_writereg(priv, val);
 278         if (err)
 279                 goto exit;
 280
 281         if (fe->ops.i2c_gate_ctrl)
 282                 fe->ops.i2c_gate_ctrl(fe, 0);
 283
 284         return 0;
 285
 286 exit:
 287         if (fe->ops.i2c_gate_ctrl)
 288                 fe->ops.i2c_gate_ctrl(fe, 0);
 289
 290         mc_printk(KERN_WARNING, "I/O Error\n");
 291         return err;
 292 }
 293
 294 static int mc44s803_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 295 {
 296         struct mc44s803_priv *priv = fe->tuner_priv;
 297         *frequency = priv->frequency;
 298         return 0;
 299 }
 300
 301 static int mc44s803_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 302 {
 303         *frequency = MC44S803_IF2; /* 36.125 MHz */
 304         return 0;
 305 }
 306
 307 static const struct dvb_tuner_ops mc44s803_tuner_ops = {
 308         .info = {
 309                 .name           = "Freescale MC44S803",
 310                 .frequency_min  =   48000000,
 311                 .frequency_max  = 1000000000,
 312                 .frequency_step =     100000,
 313         },
 314
 315         .release       = mc44s803_release,
 316         .init          = mc44s803_init,
 317         .set_params    = mc44s803_set_params,
 318         .get_frequency = mc44s803_get_frequency,
 319         .get_if_frequency = mc44s803_get_if_frequency,
 320 };
 321
 322 /* This functions tries to identify a MC44S803 tuner by reading the ID
 323    register. This is hasty. */
 324 struct dvb_frontend *mc44s803_attach(struct dvb_frontend *fe,
 325          struct i2c_adapter *i2c, struct mc44s803_config *cfg)
 326 {
 327         struct mc44s803_priv *priv;
 328         u32 reg;
 329         u8 id;
 330         int ret;
 331
 332         reg = 0;
 333
 334         priv = kzalloc(sizeof(struct mc44s803_priv), GFP_KERNEL);
 335         if (priv == NULL)
 336                 return NULL;
 337
 338         priv->cfg = cfg;
 339         priv->i2c = i2c;
 340         priv->fe  = fe;
 341
 342         if (fe->ops.i2c_gate_ctrl)
 343                 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 344
 345         ret = mc44s803_readreg(priv, MC44S803_REG_ID, &reg);
 346         if (ret)
 347                 goto error;
 348
 349         id = MC44S803_REG_MS(reg, MC44S803_ID);
 350
 351         if (id != 0x14) {
 352                 mc_printk(KERN_ERR, "unsupported ID "
 353                        "(%x should be 0x14)\n", id);
 354                 goto error;
 355         }
 356
 357         mc_printk(KERN_INFO, "successfully identified (ID = %x)\n", id);
 358         memcpy(&fe->ops.tuner_ops, &mc44s803_tuner_ops,
 359                sizeof(struct dvb_tuner_ops));
 360
 361         fe->tuner_priv = priv;
 362
 363         if (fe->ops.i2c_gate_ctrl)
 364                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 365
 366         return fe;
 367
 368 error:
 369         if (fe->ops.i2c_gate_ctrl)
 370                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 371
 372         kfree(priv);
 373         return NULL;
 374 }
 375 EXPORT_SYMBOL(mc44s803_attach);
 376
 377 MODULE_AUTHOR("Jochen Friedrich");
 378 MODULE_DESCRIPTION("Freescale MC44S803 silicon tuner driver");
 379 MODULE_LICENSE("GPL");