drivers/media/dvb-frontends/stv6110.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * stv6110.c
   4  *
   5  * Driver for ST STV6110 satellite tuner IC.
   6  *
   7  * Copyright (C) 2009 NetUP Inc.
   8  * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
   9  */
  10
  11 #include <linux/slab.h>
  12 #include <linux/module.h>
  13 #include <linux/dvb/frontend.h>
  14
  15 #include <linux/types.h>
  16
  17 #include "stv6110.h"
  18
  19 /* Max transfer size done by I2C transfer functions */
  20 #define MAX_XFER_SIZE  64
  21
  22 static int debug;
  23
  24 struct stv6110_priv {
  25         int i2c_address;
  26         struct i2c_adapter *i2c;
  27
  28         u32 mclk;
  29         u8 clk_div;
  30         u8 gain;
  31         u8 regs[8];
  32 };
  33
  34 #define dprintk(args...) \
  35         do { \
  36                 if (debug) \
  37                         printk(KERN_DEBUG args); \
  38         } while (0)
  39
  40 static s32 abssub(s32 a, s32 b)
  41 {
  42         if (a > b)
  43                 return a - b;
  44         else
  45                 return b - a;
  46 };
  47
  48 static void stv6110_release(struct dvb_frontend *fe)
  49 {
  50         kfree(fe->tuner_priv);
  51         fe->tuner_priv = NULL;
  52 }
  53
  54 static int stv6110_write_regs(struct dvb_frontend *fe, u8 buf[],
  55                                                         int start, int len)
  56 {
  57         struct stv6110_priv *priv = fe->tuner_priv;
  58         int rc;
  59         u8 cmdbuf[MAX_XFER_SIZE];
  60         struct i2c_msg msg = {
  61                 .addr   = priv->i2c_address,
  62                 .flags  = 0,
  63                 .buf    = cmdbuf,
  64                 .len    = len + 1
  65         };
  66
  67         dprintk("%s\n", __func__);
  68
  69         if (1 + len > sizeof(cmdbuf)) {
  70                 printk(KERN_WARNING
  71                        "%s: i2c wr: len=%d is too big!\n",
  72                        KBUILD_MODNAME, len);
  73                 return -EINVAL;
  74         }
  75
  76         if (start + len > 8)
  77                 return -EINVAL;
  78
  79         memcpy(&cmdbuf[1], buf, len);
  80         cmdbuf[0] = start;
  81
  82         if (fe->ops.i2c_gate_ctrl)
  83                 fe->ops.i2c_gate_ctrl(fe, 1);
  84
  85         rc = i2c_transfer(priv->i2c, &msg, 1);
  86         if (rc != 1)
  87                 dprintk("%s: i2c error\n", __func__);
  88
  89         if (fe->ops.i2c_gate_ctrl)
  90                 fe->ops.i2c_gate_ctrl(fe, 0);
  91
  92         return 0;
  93 }
  94
  95 static int stv6110_read_regs(struct dvb_frontend *fe, u8 regs[],
  96                                                         int start, int len)
  97 {
  98         struct stv6110_priv *priv = fe->tuner_priv;
  99         int rc;
 100         u8 reg[] = { start };
 101         struct i2c_msg msg[] = {
 102                 {
 103                         .addr   = priv->i2c_address,
 104                         .flags  = 0,
 105                         .buf    = reg,
 106                         .len    = 1,
 107                 }, {
 108                         .addr   = priv->i2c_address,
 109                         .flags  = I2C_M_RD,
 110                         .buf    = regs,
 111                         .len    = len,
 112                 },
 113         };
 114
 115         if (fe->ops.i2c_gate_ctrl)
 116                 fe->ops.i2c_gate_ctrl(fe, 1);
 117
 118         rc = i2c_transfer(priv->i2c, msg, 2);
 119         if (rc != 2)
 120                 dprintk("%s: i2c error\n", __func__);
 121
 122         if (fe->ops.i2c_gate_ctrl)
 123                 fe->ops.i2c_gate_ctrl(fe, 0);
 124
 125         memcpy(&priv->regs[start], regs, len);
 126
 127         return 0;
 128 }
 129
 130 static int stv6110_read_reg(struct dvb_frontend *fe, int start)
 131 {
 132         u8 buf[] = { 0 };
 133         stv6110_read_regs(fe, buf, start, 1);
 134
 135         return buf[0];
 136 }
 137
 138 static int stv6110_sleep(struct dvb_frontend *fe)
 139 {
 140         u8 reg[] = { 0 };
 141         stv6110_write_regs(fe, reg, 0, 1);
 142
 143         return 0;
 144 }
 145
 146 static u32 carrier_width(u32 symbol_rate, enum fe_rolloff rolloff)
 147 {
 148         u32 rlf;
 149
 150         switch (rolloff) {
 151         case ROLLOFF_20:
 152                 rlf = 20;
 153                 break;
 154         case ROLLOFF_25:
 155                 rlf = 25;
 156                 break;
 157         default:
 158                 rlf = 35;
 159                 break;
 160         }
 161
 162         return symbol_rate  + ((symbol_rate * rlf) / 100);
 163 }
 164
 165 static int stv6110_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
 166 {
 167         struct stv6110_priv *priv = fe->tuner_priv;
 168         u8 r8, ret = 0x04;
 169         int i;
 170
 171         if ((bandwidth / 2) > 36000000) /*BW/2 max=31+5=36 mhz for r8=31*/
 172                 r8 = 31;
 173         else if ((bandwidth / 2) < 5000000) /* BW/2 min=5Mhz for F=0 */
 174                 r8 = 0;
 175         else /*if 5 < BW/2 < 36*/
 176                 r8 = (bandwidth / 2) / 1000000 - 5;
 177
 178         /* ctrl3, RCCLKOFF = 0 Activate the calibration Clock */
 179         /* ctrl3, CF = r8 Set the LPF value */
 180         priv->regs[RSTV6110_CTRL3] &= ~((1 << 6) | 0x1f);
 181         priv->regs[RSTV6110_CTRL3] |= (r8 & 0x1f);
 182         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
 183         /* stat1, CALRCSTRT = 1 Start LPF auto calibration*/
 184         priv->regs[RSTV6110_STAT1] |= 0x02;
 185         stv6110_write_regs(fe, &priv->regs[RSTV6110_STAT1], RSTV6110_STAT1, 1);
 186
 187         i = 0;
 188         /* Wait for CALRCSTRT == 0 */
 189         while ((i < 10) && (ret != 0)) {
 190                 ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x02);
 191                 mdelay(1);      /* wait for LPF auto calibration */
 192                 i++;
 193         }
 194
 195         /* RCCLKOFF = 1 calibration done, deactivate the calibration Clock */
 196         priv->regs[RSTV6110_CTRL3] |= (1 << 6);
 197         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
 198         return 0;
 199 }
 200
 201 static int stv6110_init(struct dvb_frontend *fe)
 202 {
 203         struct stv6110_priv *priv = fe->tuner_priv;
 204         u8 buf0[] = { 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };
 205
 206         memcpy(priv->regs, buf0, 8);
 207         /* K = (Reference / 1000000) - 16 */
 208         priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
 209         priv->regs[RSTV6110_CTRL1] |=
 210                                 ((((priv->mclk / 1000000) - 16) & 0x1f) << 3);
 211
 212         /* divisor value for the output clock */
 213         priv->regs[RSTV6110_CTRL2] &= ~0xc0;
 214         priv->regs[RSTV6110_CTRL2] |= (priv->clk_div << 6);
 215
 216         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1], RSTV6110_CTRL1, 8);
 217         msleep(1);
 218         stv6110_set_bandwidth(fe, 72000000);
 219
 220         return 0;
 221 }
 222
 223 static int stv6110_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 224 {
 225         struct stv6110_priv *priv = fe->tuner_priv;
 226         u32 nbsteps, divider, psd2, freq;
 227         u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 228
 229         stv6110_read_regs(fe, regs, 0, 8);
 230         /*N*/
 231         divider = (priv->regs[RSTV6110_TUNING2] & 0x0f) << 8;
 232         divider += priv->regs[RSTV6110_TUNING1];
 233
 234         /*R*/
 235         nbsteps  = (priv->regs[RSTV6110_TUNING2] >> 6) & 3;
 236         /*p*/
 237         psd2  = (priv->regs[RSTV6110_TUNING2] >> 4) & 1;
 238
 239         freq = divider * (priv->mclk / 1000);
 240         freq /= (1 << (nbsteps + psd2));
 241         freq /= 4;
 242
 243         *frequency = freq;
 244
 245         return 0;
 246 }
 247
 248 static int stv6110_set_frequency(struct dvb_frontend *fe, u32 frequency)
 249 {
 250         struct stv6110_priv *priv = fe->tuner_priv;
 251         u8 ret = 0x04;
 252         u32 divider, ref, p, presc, i, result_freq, vco_freq;
 253         s32 p_calc, p_calc_opt = 1000, r_div, r_div_opt = 0, p_val;
 254
 255         dprintk("%s, freq=%d kHz, mclk=%d Hz\n", __func__,
 256                                                 frequency, priv->mclk);
 257
 258         /* K = (Reference / 1000000) - 16 */
 259         priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
 260         priv->regs[RSTV6110_CTRL1] |=
 261                                 ((((priv->mclk / 1000000) - 16) & 0x1f) << 3);
 262
 263         /* BB_GAIN = db/2 */
 264         priv->regs[RSTV6110_CTRL2] &= ~0x0f;
 265         priv->regs[RSTV6110_CTRL2] |= (priv->gain & 0x0f);
 266
 267         if (frequency <= 1023000) {
 268                 p = 1;
 269                 presc = 0;
 270         } else if (frequency <= 1300000) {
 271                 p = 1;
 272                 presc = 1;
 273         } else if (frequency <= 2046000) {
 274                 p = 0;
 275                 presc = 0;
 276         } else {
 277                 p = 0;
 278                 presc = 1;
 279         }
 280         /* DIV4SEL = p*/
 281         priv->regs[RSTV6110_TUNING2] &= ~(1 << 4);
 282         priv->regs[RSTV6110_TUNING2] |= (p << 4);
 283
 284         /* PRESC32ON = presc */
 285         priv->regs[RSTV6110_TUNING2] &= ~(1 << 5);
 286         priv->regs[RSTV6110_TUNING2] |= (presc << 5);
 287
 288         p_val = (int)(1 << (p + 1)) * 10;/* P = 2 or P = 4 */
 289         for (r_div = 0; r_div <= 3; r_div++) {
 290                 p_calc = (priv->mclk / 100000);
 291                 p_calc /= (1 << (r_div + 1));
 292                 if ((abssub(p_calc, p_val)) < (abssub(p_calc_opt, p_val)))
 293                         r_div_opt = r_div;
 294
 295                 p_calc_opt = (priv->mclk / 100000);
 296                 p_calc_opt /= (1 << (r_div_opt + 1));
 297         }
 298
 299         ref = priv->mclk / ((1 << (r_div_opt + 1))  * (1 << (p + 1)));
 300         divider = (((frequency * 1000) + (ref >> 1)) / ref);
 301
 302         /* RDIV = r_div_opt */
 303         priv->regs[RSTV6110_TUNING2] &= ~(3 << 6);
 304         priv->regs[RSTV6110_TUNING2] |= (((r_div_opt) & 3) << 6);
 305
 306         /* NDIV_MSB = MSB(divider) */
 307         priv->regs[RSTV6110_TUNING2] &= ~0x0f;
 308         priv->regs[RSTV6110_TUNING2] |= (((divider) >> 8) & 0x0f);
 309
 310         /* NDIV_LSB, LSB(divider) */
 311         priv->regs[RSTV6110_TUNING1] = (divider & 0xff);
 312
 313         /* CALVCOSTRT = 1 VCO Auto Calibration */
 314         priv->regs[RSTV6110_STAT1] |= 0x04;
 315         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1],
 316                                                 RSTV6110_CTRL1, 8);
 317
 318         i = 0;
 319         /* Wait for CALVCOSTRT == 0 */
 320         while ((i < 10) && (ret != 0)) {
 321                 ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x04);
 322                 msleep(1); /* wait for VCO auto calibration */
 323                 i++;
 324         }
 325
 326         ret = stv6110_read_reg(fe, RSTV6110_STAT1);
 327         stv6110_get_frequency(fe, &result_freq);
 328
 329         vco_freq = divider * ((priv->mclk / 1000) / ((1 << (r_div_opt + 1))));
 330         dprintk("%s, stat1=%x, lo_freq=%d kHz, vco_frec=%d kHz\n", __func__,
 331                                                 ret, result_freq, vco_freq);
 332
 333         return 0;
 334 }
 335
 336 static int stv6110_set_params(struct dvb_frontend *fe)
 337 {
 338         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 339         u32 bandwidth = carrier_width(c->symbol_rate, c->rolloff);
 340
 341         stv6110_set_frequency(fe, c->frequency);
 342         stv6110_set_bandwidth(fe, bandwidth);
 343
 344         return 0;
 345 }
 346
 347 static int stv6110_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 348 {
 349         struct stv6110_priv *priv = fe->tuner_priv;
 350         u8 r8 = 0;
 351         u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 352         stv6110_read_regs(fe, regs, 0, 8);
 353
 354         /* CF */
 355         r8 = priv->regs[RSTV6110_CTRL3] & 0x1f;
 356         *bandwidth = (r8 + 5) * 2000000;/* x2 for ZIF tuner BW/2 = F+5 Mhz */
 357
 358         return 0;
 359 }
 360
 361 static const struct dvb_tuner_ops stv6110_tuner_ops = {
 362         .info = {
 363                 .name = "ST STV6110",
 364                 .frequency_min_hz  =  950 * MHz,
 365                 .frequency_max_hz  = 2150 * MHz,
 366                 .frequency_step_hz =    1 * MHz,
 367         },
 368         .init = stv6110_init,
 369         .release = stv6110_release,
 370         .sleep = stv6110_sleep,
 371         .set_params = stv6110_set_params,
 372         .get_frequency = stv6110_get_frequency,
 373         .set_frequency = stv6110_set_frequency,
 374         .get_bandwidth = stv6110_get_bandwidth,
 375         .set_bandwidth = stv6110_set_bandwidth,
 376
 377 };
 378
 379 struct dvb_frontend *stv6110_attach(struct dvb_frontend *fe,
 380                                         const struct stv6110_config *config,
 381                                         struct i2c_adapter *i2c)
 382 {
 383         struct stv6110_priv *priv = NULL;
 384         u8 reg0[] = { 0x00, 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };
 385
 386         struct i2c_msg msg[] = {
 387                 {
 388                         .addr = config->i2c_address,
 389                         .flags = 0,
 390                         .buf = reg0,
 391                         .len = 9
 392                 }
 393         };
 394         int ret;
 395
 396         /* divisor value for the output clock */
 397         reg0[2] &= ~0xc0;
 398         reg0[2] |= (config->clk_div << 6);
 399
 400         if (fe->ops.i2c_gate_ctrl)
 401                 fe->ops.i2c_gate_ctrl(fe, 1);
 402
 403         ret = i2c_transfer(i2c, msg, 1);
 404
 405         if (fe->ops.i2c_gate_ctrl)
 406                 fe->ops.i2c_gate_ctrl(fe, 0);
 407
 408         if (ret != 1)
 409                 return NULL;
 410
 411         priv = kzalloc(sizeof(struct stv6110_priv), GFP_KERNEL);
 412         if (priv == NULL)
 413                 return NULL;
 414
 415         priv->i2c_address = config->i2c_address;
 416         priv->i2c = i2c;
 417         priv->mclk = config->mclk;
 418         priv->clk_div = config->clk_div;
 419         priv->gain = config->gain;
 420
 421         memcpy(&priv->regs, &reg0[1], 8);
 422
 423         memcpy(&fe->ops.tuner_ops, &stv6110_tuner_ops,
 424                                 sizeof(struct dvb_tuner_ops));
 425         fe->tuner_priv = priv;
 426         printk(KERN_INFO "STV6110 attached on addr=%x!\n", priv->i2c_address);
 427
 428         return fe;
 429 }
 430 EXPORT_SYMBOL(stv6110_attach);
 431
 432 module_param(debug, int, 0644);
 433 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 434
 435 MODULE_DESCRIPTION("ST STV6110 driver");
 436 MODULE_AUTHOR("Igor M. Liplianin");
 437 MODULE_LICENSE("GPL");