Igor M. Liplianin | 47220bc | 2009-03-03 11:16:40 -0300 | [diff] [blame] | 1 | /* |
| 2 | * stv6110.c |
| 3 | * |
| 4 | * Driver for ST STV6110 satellite tuner IC. |
| 5 | * |
| 6 | * Copyright (C) 2009 NetUP Inc. |
| 7 | * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 | */ |
| 24 | |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/dvb/frontend.h> |
| 27 | |
| 28 | #include <linux/types.h> |
| 29 | |
| 30 | #include "stv6110.h" |
| 31 | |
| 32 | static int debug; |
| 33 | |
| 34 | struct stv6110_priv { |
| 35 | int i2c_address; |
| 36 | struct i2c_adapter *i2c; |
| 37 | |
| 38 | u32 mclk; |
| 39 | u8 regs[8]; |
| 40 | }; |
| 41 | |
| 42 | #define dprintk(args...) \ |
| 43 | do { \ |
| 44 | if (debug) \ |
| 45 | printk(KERN_DEBUG args); \ |
| 46 | } while (0) |
| 47 | |
| 48 | static s32 abssub(s32 a, s32 b) |
| 49 | { |
| 50 | if (a > b) |
| 51 | return a - b; |
| 52 | else |
| 53 | return b - a; |
| 54 | }; |
| 55 | |
| 56 | static int stv6110_release(struct dvb_frontend *fe) |
| 57 | { |
| 58 | kfree(fe->tuner_priv); |
| 59 | fe->tuner_priv = NULL; |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static int stv6110_write_regs(struct dvb_frontend *fe, u8 buf[], |
| 64 | int start, int len) |
| 65 | { |
| 66 | struct stv6110_priv *priv = fe->tuner_priv; |
| 67 | int rc; |
| 68 | u8 cmdbuf[len + 1]; |
| 69 | struct i2c_msg msg = { |
| 70 | .addr = priv->i2c_address, |
| 71 | .flags = 0, |
| 72 | .buf = cmdbuf, |
| 73 | .len = len + 1 |
| 74 | }; |
| 75 | |
| 76 | dprintk("%s\n", __func__); |
| 77 | |
| 78 | if (start + len > 8) |
| 79 | return -EINVAL; |
| 80 | |
| 81 | memcpy(&cmdbuf[1], buf, len); |
| 82 | cmdbuf[0] = start; |
| 83 | |
| 84 | if (fe->ops.i2c_gate_ctrl) |
| 85 | fe->ops.i2c_gate_ctrl(fe, 1); |
| 86 | |
| 87 | rc = i2c_transfer(priv->i2c, &msg, 1); |
| 88 | if (rc != 1) |
| 89 | dprintk("%s: i2c error\n", __func__); |
| 90 | |
| 91 | if (fe->ops.i2c_gate_ctrl) |
| 92 | fe->ops.i2c_gate_ctrl(fe, 0); |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | static int stv6110_read_regs(struct dvb_frontend *fe, u8 regs[], |
| 98 | int start, int len) |
| 99 | { |
| 100 | struct stv6110_priv *priv = fe->tuner_priv; |
| 101 | int rc; |
| 102 | u8 reg[] = { start }; |
| 103 | struct i2c_msg msg_wr = { |
| 104 | .addr = priv->i2c_address, |
| 105 | .flags = 0, |
| 106 | .buf = reg, |
| 107 | .len = 1, |
| 108 | }; |
| 109 | |
| 110 | struct i2c_msg msg_rd = { |
| 111 | .addr = priv->i2c_address, |
| 112 | .flags = I2C_M_RD, |
| 113 | .buf = regs, |
| 114 | .len = len, |
| 115 | }; |
| 116 | /* write subaddr */ |
| 117 | if (fe->ops.i2c_gate_ctrl) |
| 118 | fe->ops.i2c_gate_ctrl(fe, 1); |
| 119 | |
| 120 | rc = i2c_transfer(priv->i2c, &msg_wr, 1); |
| 121 | if (rc != 1) |
| 122 | dprintk("%s: i2c error\n", __func__); |
| 123 | |
| 124 | if (fe->ops.i2c_gate_ctrl) |
| 125 | fe->ops.i2c_gate_ctrl(fe, 0); |
| 126 | /* read registers */ |
| 127 | if (fe->ops.i2c_gate_ctrl) |
| 128 | fe->ops.i2c_gate_ctrl(fe, 1); |
| 129 | |
| 130 | rc = i2c_transfer(priv->i2c, &msg_rd, 1); |
| 131 | if (rc != 1) |
| 132 | dprintk("%s: i2c error\n", __func__); |
| 133 | |
| 134 | if (fe->ops.i2c_gate_ctrl) |
| 135 | fe->ops.i2c_gate_ctrl(fe, 0); |
| 136 | |
| 137 | memcpy(&priv->regs[start], regs, len); |
| 138 | |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | static int stv6110_read_reg(struct dvb_frontend *fe, int start) |
| 143 | { |
| 144 | u8 buf[] = { 0 }; |
| 145 | stv6110_read_regs(fe, buf, start, 1); |
| 146 | |
| 147 | return buf[0]; |
| 148 | } |
| 149 | |
| 150 | static int stv6110_sleep(struct dvb_frontend *fe) |
| 151 | { |
| 152 | u8 reg[] = { 0 }; |
| 153 | stv6110_write_regs(fe, reg, 0, 1); |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static u32 carrier_width(u32 symbol_rate, fe_rolloff_t rolloff) |
| 159 | { |
| 160 | u32 rlf; |
| 161 | |
| 162 | switch (rolloff) { |
| 163 | case ROLLOFF_20: |
| 164 | rlf = 20; |
| 165 | break; |
| 166 | case ROLLOFF_25: |
| 167 | rlf = 25; |
| 168 | break; |
| 169 | default: |
| 170 | rlf = 35; |
| 171 | break; |
| 172 | } |
| 173 | |
| 174 | return symbol_rate + ((symbol_rate * rlf) / 100); |
| 175 | } |
| 176 | |
| 177 | static int stv6110_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth) |
| 178 | { |
| 179 | struct stv6110_priv *priv = fe->tuner_priv; |
| 180 | u8 r8, ret = 0x04; |
| 181 | int i; |
| 182 | |
| 183 | if ((bandwidth / 2) > 36000000) /*BW/2 max=31+5=36 mhz for r8=31*/ |
| 184 | r8 = 31; |
| 185 | else if ((bandwidth / 2) < 5000000) /* BW/2 min=5Mhz for F=0 */ |
| 186 | r8 = 0; |
| 187 | else /*if 5 < BW/2 < 36*/ |
| 188 | r8 = (bandwidth / 2) / 1000000 - 5; |
| 189 | |
| 190 | /* ctrl3, RCCLKOFF = 0 Activate the calibration Clock */ |
| 191 | /* ctrl3, CF = r8 Set the LPF value */ |
| 192 | priv->regs[RSTV6110_CTRL3] &= ~((1 << 6) | 0x1f); |
| 193 | priv->regs[RSTV6110_CTRL3] |= (r8 & 0x1f); |
| 194 | stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1); |
| 195 | /* stat1, CALRCSTRT = 1 Start LPF auto calibration*/ |
| 196 | priv->regs[RSTV6110_STAT1] |= 0x02; |
| 197 | stv6110_write_regs(fe, &priv->regs[RSTV6110_STAT1], RSTV6110_STAT1, 1); |
| 198 | |
| 199 | i = 0; |
| 200 | /* Wait for CALRCSTRT == 0 */ |
| 201 | while ((i < 10) && (ret != 0)) { |
| 202 | ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x02); |
| 203 | mdelay(1); /* wait for LPF auto calibration */ |
| 204 | i++; |
| 205 | } |
| 206 | |
| 207 | /* RCCLKOFF = 1 calibration done, desactivate the calibration Clock */ |
| 208 | priv->regs[RSTV6110_CTRL3] |= (1 << 6); |
| 209 | stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1); |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | static int stv6110_init(struct dvb_frontend *fe) |
| 214 | { |
| 215 | struct stv6110_priv *priv = fe->tuner_priv; |
| 216 | u8 buf0[] = { 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e }; |
| 217 | |
| 218 | memcpy(priv->regs, buf0, 8); |
| 219 | /* K = (Reference / 1000000) - 16 */ |
| 220 | priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3); |
| 221 | priv->regs[RSTV6110_CTRL1] |= |
| 222 | ((((priv->mclk / 1000000) - 16) & 0x1f) << 3); |
| 223 | |
| 224 | stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1], RSTV6110_CTRL1, 8); |
| 225 | msleep(1); |
| 226 | stv6110_set_bandwidth(fe, 72000000); |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | static int stv6110_get_frequency(struct dvb_frontend *fe, u32 *frequency) |
| 232 | { |
| 233 | struct stv6110_priv *priv = fe->tuner_priv; |
| 234 | u32 nbsteps, divider, psd2, freq; |
| 235 | u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 236 | |
| 237 | stv6110_read_regs(fe, regs, 0, 8); |
| 238 | /*N*/ |
| 239 | divider = (priv->regs[RSTV6110_TUNING2] & 0x0f) << 8; |
| 240 | divider += priv->regs[RSTV6110_TUNING1]; |
| 241 | |
| 242 | /*R*/ |
| 243 | nbsteps = (priv->regs[RSTV6110_TUNING2] >> 6) & 3; |
| 244 | /*p*/ |
| 245 | psd2 = (priv->regs[RSTV6110_TUNING2] >> 4) & 1; |
| 246 | |
| 247 | freq = divider * (priv->mclk / 1000); |
| 248 | freq /= (1 << (nbsteps + psd2)); |
| 249 | freq /= 4; |
| 250 | |
| 251 | *frequency = freq; |
| 252 | |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | static int stv6110_set_frequency(struct dvb_frontend *fe, u32 frequency) |
| 257 | { |
| 258 | struct stv6110_priv *priv = fe->tuner_priv; |
| 259 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
| 260 | u8 ret = 0x04; |
| 261 | u32 divider, ref, p, presc, i, result_freq, vco_freq; |
| 262 | s32 p_calc, p_calc_opt = 1000, r_div, r_div_opt = 0, p_val; |
| 263 | s32 srate; u8 gain; |
| 264 | |
| 265 | dprintk("%s, freq=%d kHz, mclk=%d Hz\n", __func__, |
| 266 | frequency, priv->mclk); |
| 267 | |
| 268 | /* K = (Reference / 1000000) - 16 */ |
| 269 | priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3); |
| 270 | priv->regs[RSTV6110_CTRL1] |= |
| 271 | ((((priv->mclk / 1000000) - 16) & 0x1f) << 3); |
| 272 | |
| 273 | /* BB_GAIN = db/2 */ |
| 274 | if (fe->ops.set_property && fe->ops.get_property) { |
| 275 | srate = c->symbol_rate; |
| 276 | dprintk("%s: Get Frontend parameters: srate=%d\n", |
| 277 | __func__, srate); |
| 278 | } else |
| 279 | srate = 15000000; |
| 280 | |
| 281 | if (srate >= 15000000) |
| 282 | gain = 3; /* +6 dB */ |
| 283 | else if (srate >= 5000000) |
| 284 | gain = 3; /* +6 dB */ |
| 285 | else |
| 286 | gain = 3; /* +6 dB */ |
| 287 | |
| 288 | priv->regs[RSTV6110_CTRL2] &= ~0x0f; |
| 289 | priv->regs[RSTV6110_CTRL2] |= (gain & 0x0f); |
| 290 | |
| 291 | if (frequency <= 1023000) { |
| 292 | p = 1; |
| 293 | presc = 0; |
| 294 | } else if (frequency <= 1300000) { |
| 295 | p = 1; |
| 296 | presc = 1; |
| 297 | } else if (frequency <= 2046000) { |
| 298 | p = 0; |
| 299 | presc = 0; |
| 300 | } else { |
| 301 | p = 0; |
| 302 | presc = 1; |
| 303 | } |
| 304 | /* DIV4SEL = p*/ |
| 305 | priv->regs[RSTV6110_TUNING2] &= ~(1 << 4); |
| 306 | priv->regs[RSTV6110_TUNING2] |= (p << 4); |
| 307 | |
| 308 | /* PRESC32ON = presc */ |
| 309 | priv->regs[RSTV6110_TUNING2] &= ~(1 << 5); |
| 310 | priv->regs[RSTV6110_TUNING2] |= (presc << 5); |
| 311 | |
| 312 | p_val = (int)(1 << (p + 1)) * 10;/* P = 2 or P = 4 */ |
| 313 | for (r_div = 0; r_div <= 3; r_div++) { |
| 314 | p_calc = (priv->mclk / 100000); |
| 315 | p_calc /= (1 << (r_div + 1)); |
| 316 | if ((abssub(p_calc, p_val)) < (abssub(p_calc_opt, p_val))) |
| 317 | r_div_opt = r_div; |
| 318 | |
| 319 | p_calc_opt = (priv->mclk / 100000); |
| 320 | p_calc_opt /= (1 << (r_div_opt + 1)); |
| 321 | } |
| 322 | |
| 323 | ref = priv->mclk / ((1 << (r_div_opt + 1)) * (1 << (p + 1))); |
| 324 | divider = (((frequency * 1000) + (ref >> 1)) / ref); |
| 325 | |
| 326 | /* RDIV = r_div_opt */ |
| 327 | priv->regs[RSTV6110_TUNING2] &= ~(3 << 6); |
| 328 | priv->regs[RSTV6110_TUNING2] |= (((r_div_opt) & 3) << 6); |
| 329 | |
| 330 | /* NDIV_MSB = MSB(divider) */ |
| 331 | priv->regs[RSTV6110_TUNING2] &= ~0x0f; |
| 332 | priv->regs[RSTV6110_TUNING2] |= (((divider) >> 8) & 0x0f); |
| 333 | |
| 334 | /* NDIV_LSB, LSB(divider) */ |
| 335 | priv->regs[RSTV6110_TUNING1] = (divider & 0xff); |
| 336 | |
| 337 | /* CALVCOSTRT = 1 VCO Auto Calibration */ |
| 338 | priv->regs[RSTV6110_STAT1] |= 0x04; |
| 339 | stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1], |
| 340 | RSTV6110_CTRL1, 8); |
| 341 | |
| 342 | i = 0; |
| 343 | /* Wait for CALVCOSTRT == 0 */ |
| 344 | while ((i < 10) && (ret != 0)) { |
| 345 | ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x04); |
| 346 | msleep(1); /* wait for VCO auto calibration */ |
| 347 | i++; |
| 348 | } |
| 349 | |
| 350 | ret = stv6110_read_reg(fe, RSTV6110_STAT1); |
| 351 | stv6110_get_frequency(fe, &result_freq); |
| 352 | |
| 353 | vco_freq = divider * ((priv->mclk / 1000) / ((1 << (r_div_opt + 1)))); |
| 354 | dprintk("%s, stat1=%x, lo_freq=%d kHz, vco_frec=%d kHz\n", __func__, |
| 355 | ret, result_freq, vco_freq); |
| 356 | |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | static int stv6110_set_params(struct dvb_frontend *fe, |
| 361 | struct dvb_frontend_parameters *params) |
| 362 | { |
| 363 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
| 364 | u32 bandwidth = carrier_width(c->symbol_rate, c->rolloff); |
| 365 | |
| 366 | stv6110_set_frequency(fe, c->frequency); |
| 367 | stv6110_set_bandwidth(fe, bandwidth); |
| 368 | |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | static int stv6110_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth) |
| 373 | { |
| 374 | struct stv6110_priv *priv = fe->tuner_priv; |
| 375 | u8 r8 = 0; |
| 376 | u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 377 | stv6110_read_regs(fe, regs, 0, 8); |
| 378 | |
| 379 | /* CF */ |
| 380 | r8 = priv->regs[RSTV6110_CTRL3] & 0x1f; |
| 381 | *bandwidth = (r8 + 5) * 2000000;/* x2 for ZIF tuner BW/2 = F+5 Mhz */ |
| 382 | |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | static struct dvb_tuner_ops stv6110_tuner_ops = { |
| 387 | .info = { |
| 388 | .name = "ST STV6110", |
| 389 | .frequency_min = 950000, |
| 390 | .frequency_max = 2150000, |
| 391 | .frequency_step = 1000, |
| 392 | }, |
| 393 | .init = stv6110_init, |
| 394 | .release = stv6110_release, |
| 395 | .sleep = stv6110_sleep, |
| 396 | .set_params = stv6110_set_params, |
| 397 | .get_frequency = stv6110_get_frequency, |
| 398 | .set_frequency = stv6110_set_frequency, |
| 399 | .get_bandwidth = stv6110_get_bandwidth, |
| 400 | .set_bandwidth = stv6110_set_bandwidth, |
| 401 | |
| 402 | }; |
| 403 | |
| 404 | struct dvb_frontend *stv6110_attach(struct dvb_frontend *fe, |
| 405 | const struct stv6110_config *config, |
| 406 | struct i2c_adapter *i2c) |
| 407 | { |
| 408 | struct stv6110_priv *priv = NULL; |
| 409 | u8 reg0[] = { 0x00, 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e }; |
| 410 | |
| 411 | struct i2c_msg msg[] = { |
| 412 | { |
| 413 | .addr = config->i2c_address, |
| 414 | .flags = 0, |
| 415 | .buf = reg0, |
| 416 | .len = 9 |
| 417 | } |
| 418 | }; |
| 419 | int ret; |
| 420 | |
| 421 | if (fe->ops.i2c_gate_ctrl) |
| 422 | fe->ops.i2c_gate_ctrl(fe, 1); |
| 423 | |
| 424 | ret = i2c_transfer(i2c, msg, 1); |
| 425 | |
| 426 | if (fe->ops.i2c_gate_ctrl) |
| 427 | fe->ops.i2c_gate_ctrl(fe, 0); |
| 428 | |
| 429 | if (ret != 1) |
| 430 | return NULL; |
| 431 | |
| 432 | priv = kzalloc(sizeof(struct stv6110_priv), GFP_KERNEL); |
| 433 | if (priv == NULL) |
| 434 | return NULL; |
| 435 | |
| 436 | priv->i2c_address = config->i2c_address; |
| 437 | priv->i2c = i2c; |
| 438 | priv->mclk = config->mclk; |
| 439 | |
| 440 | memcpy(&priv->regs, ®0[1], 8); |
| 441 | |
| 442 | memcpy(&fe->ops.tuner_ops, &stv6110_tuner_ops, |
| 443 | sizeof(struct dvb_tuner_ops)); |
| 444 | fe->tuner_priv = priv; |
| 445 | printk(KERN_INFO "STV6110 attached on addr=%x!\n", priv->i2c_address); |
| 446 | |
| 447 | return fe; |
| 448 | } |
| 449 | EXPORT_SYMBOL(stv6110_attach); |
| 450 | |
| 451 | module_param(debug, int, 0644); |
| 452 | MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); |
| 453 | |
| 454 | MODULE_DESCRIPTION("ST STV6110 driver"); |
| 455 | MODULE_AUTHOR("Igor M. Liplianin"); |
| 456 | MODULE_LICENSE("GPL"); |