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1// SPDX-License-Identifier: GPL-2.02// For Philips TEA5767 FM Chip used on some TV Cards like Prolink Pixelview3// I2C address is always 0xC0.4//5// Copyright (c) 2005 Mauro Carvalho Chehab <mchehab@kernel.org>6//7// tea5767 autodetection thanks to Torsten Seeboth and Atsushi Nakagawa8// from their contributions on DScaler.9 10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt11 12#include <linux/i2c.h>13#include <linux/slab.h>14#include <linux/delay.h>15#include <linux/videodev2.h>16#include "tuner-i2c.h"17#include "tea5767.h"18 19static int debug;20module_param(debug, int, 0644);21MODULE_PARM_DESC(debug, "enable verbose debug messages");22 23/*****************************************************************************/24 25struct tea5767_priv {26 struct tuner_i2c_props i2c_props;27 u32 frequency;28 struct tea5767_ctrl ctrl;29};30 31/*****************************************************************************/32 33/******************************34 * Write mode register values *35 ******************************/36 37/* First register */38#define TEA5767_MUTE 0x80 /* Mutes output */39#define TEA5767_SEARCH 0x40 /* Activates station search */40/* Bits 0-5 for divider MSB */41 42/* Second register */43/* Bits 0-7 for divider LSB */44 45/* Third register */46 47/* Station search from botton to up */48#define TEA5767_SEARCH_UP 0x8049 50/* Searches with ADC output = 10 */51#define TEA5767_SRCH_HIGH_LVL 0x6052 53/* Searches with ADC output = 10 */54#define TEA5767_SRCH_MID_LVL 0x4055 56/* Searches with ADC output = 5 */57#define TEA5767_SRCH_LOW_LVL 0x2058 59/* if on, div=4*(Frf+Fif)/Fref otherwise, div=4*(Frf-Fif)/Freq) */60#define TEA5767_HIGH_LO_INJECT 0x1061 62/* Disable stereo */63#define TEA5767_MONO 0x0864 65/* Disable right channel and turns to mono */66#define TEA5767_MUTE_RIGHT 0x0467 68/* Disable left channel and turns to mono */69#define TEA5767_MUTE_LEFT 0x0270 71#define TEA5767_PORT1_HIGH 0x0172 73/* Fourth register */74#define TEA5767_PORT2_HIGH 0x8075/* Chips stops working. Only I2C bus remains on */76#define TEA5767_STDBY 0x4077 78/* Japan freq (76-108 MHz. If disabled, 87.5-108 MHz */79#define TEA5767_JAPAN_BAND 0x2080 81/* Unselected means 32.768 KHz freq as reference. Otherwise Xtal at 13 MHz */82#define TEA5767_XTAL_32768 0x1083 84/* Cuts weak signals */85#define TEA5767_SOFT_MUTE 0x0886 87/* Activates high cut control */88#define TEA5767_HIGH_CUT_CTRL 0x0489 90/* Activates stereo noise control */91#define TEA5767_ST_NOISE_CTL 0x0292 93/* If activate PORT 1 indicates SEARCH or else it is used as PORT1 */94#define TEA5767_SRCH_IND 0x0195 96/* Fifth register */97 98/* By activating, it will use Xtal at 13 MHz as reference for divider */99#define TEA5767_PLLREF_ENABLE 0x80100 101/* By activating, deemphasis=50, or else, deemphasis of 50us */102#define TEA5767_DEEMPH_75 0X40103 104/*****************************105 * Read mode register values *106 *****************************/107 108/* First register */109#define TEA5767_READY_FLAG_MASK 0x80110#define TEA5767_BAND_LIMIT_MASK 0X40111/* Bits 0-5 for divider MSB after search or preset */112 113/* Second register */114/* Bits 0-7 for divider LSB after search or preset */115 116/* Third register */117#define TEA5767_STEREO_MASK 0x80118#define TEA5767_IF_CNTR_MASK 0x7f119 120/* Fourth register */121#define TEA5767_ADC_LEVEL_MASK 0xf0122 123/* should be 0 */124#define TEA5767_CHIP_ID_MASK 0x0f125 126/* Fifth register */127/* Reserved for future extensions */128#define TEA5767_RESERVED_MASK 0xff129 130/*****************************************************************************/131 132static void tea5767_status_dump(struct tea5767_priv *priv,133 unsigned char *buffer)134{135 unsigned int div, frq;136 137 if (TEA5767_READY_FLAG_MASK & buffer[0])138 tuner_info("Ready Flag ON\n");139 else140 tuner_info("Ready Flag OFF\n");141 142 if (TEA5767_BAND_LIMIT_MASK & buffer[0])143 tuner_info("Tuner at band limit\n");144 else145 tuner_info("Tuner not at band limit\n");146 147 div = ((buffer[0] & 0x3f) << 8) | buffer[1];148 149 switch (priv->ctrl.xtal_freq) {150 case TEA5767_HIGH_LO_13MHz:151 frq = (div * 50000 - 700000 - 225000) / 4; /* Freq in KHz */152 break;153 case TEA5767_LOW_LO_13MHz:154 frq = (div * 50000 + 700000 + 225000) / 4; /* Freq in KHz */155 break;156 case TEA5767_LOW_LO_32768:157 frq = (div * 32768 + 700000 + 225000) / 4; /* Freq in KHz */158 break;159 case TEA5767_HIGH_LO_32768:160 default:161 frq = (div * 32768 - 700000 - 225000) / 4; /* Freq in KHz */162 break;163 }164 buffer[0] = (div >> 8) & 0x3f;165 buffer[1] = div & 0xff;166 167 tuner_info("Frequency %d.%03d KHz (divider = 0x%04x)\n",168 frq / 1000, frq % 1000, div);169 170 if (TEA5767_STEREO_MASK & buffer[2])171 tuner_info("Stereo\n");172 else173 tuner_info("Mono\n");174 175 tuner_info("IF Counter = %d\n", buffer[2] & TEA5767_IF_CNTR_MASK);176 177 tuner_info("ADC Level = %d\n",178 (buffer[3] & TEA5767_ADC_LEVEL_MASK) >> 4);179 180 tuner_info("Chip ID = %d\n", (buffer[3] & TEA5767_CHIP_ID_MASK));181 182 tuner_info("Reserved = 0x%02x\n",183 (buffer[4] & TEA5767_RESERVED_MASK));184}185 186/* Freq should be specifyed at 62.5 Hz */187static int set_radio_freq(struct dvb_frontend *fe,188 struct analog_parameters *params)189{190 struct tea5767_priv *priv = fe->tuner_priv;191 unsigned int frq = params->frequency;192 unsigned char buffer[5];193 unsigned div;194 int rc;195 196 tuner_dbg("radio freq = %d.%03d MHz\n", frq/16000,(frq/16)%1000);197 198 buffer[2] = 0;199 200 if (priv->ctrl.port1)201 buffer[2] |= TEA5767_PORT1_HIGH;202 203 if (params->audmode == V4L2_TUNER_MODE_MONO) {204 tuner_dbg("TEA5767 set to mono\n");205 buffer[2] |= TEA5767_MONO;206 } else {207 tuner_dbg("TEA5767 set to stereo\n");208 }209 210 211 buffer[3] = 0;212 213 if (priv->ctrl.port2)214 buffer[3] |= TEA5767_PORT2_HIGH;215 216 if (priv->ctrl.high_cut)217 buffer[3] |= TEA5767_HIGH_CUT_CTRL;218 219 if (priv->ctrl.st_noise)220 buffer[3] |= TEA5767_ST_NOISE_CTL;221 222 if (priv->ctrl.soft_mute)223 buffer[3] |= TEA5767_SOFT_MUTE;224 225 if (priv->ctrl.japan_band)226 buffer[3] |= TEA5767_JAPAN_BAND;227 228 buffer[4] = 0;229 230 if (priv->ctrl.deemph_75)231 buffer[4] |= TEA5767_DEEMPH_75;232 233 if (priv->ctrl.pllref)234 buffer[4] |= TEA5767_PLLREF_ENABLE;235 236 237 /* Rounds freq to next decimal value - for 62.5 KHz step */238 /* frq = 20*(frq/16)+radio_frq[frq%16]; */239 240 switch (priv->ctrl.xtal_freq) {241 case TEA5767_HIGH_LO_13MHz:242 tuner_dbg("radio HIGH LO inject xtal @ 13 MHz\n");243 buffer[2] |= TEA5767_HIGH_LO_INJECT;244 div = (frq * (4000 / 16) + 700000 + 225000 + 25000) / 50000;245 break;246 case TEA5767_LOW_LO_13MHz:247 tuner_dbg("radio LOW LO inject xtal @ 13 MHz\n");248 249 div = (frq * (4000 / 16) - 700000 - 225000 + 25000) / 50000;250 break;251 case TEA5767_LOW_LO_32768:252 tuner_dbg("radio LOW LO inject xtal @ 32,768 MHz\n");253 buffer[3] |= TEA5767_XTAL_32768;254 /* const 700=4000*175 Khz - to adjust freq to right value */255 div = ((frq * (4000 / 16) - 700000 - 225000) + 16384) >> 15;256 break;257 case TEA5767_HIGH_LO_32768:258 default:259 tuner_dbg("radio HIGH LO inject xtal @ 32,768 MHz\n");260 261 buffer[2] |= TEA5767_HIGH_LO_INJECT;262 buffer[3] |= TEA5767_XTAL_32768;263 div = ((frq * (4000 / 16) + 700000 + 225000) + 16384) >> 15;264 break;265 }266 buffer[0] = (div >> 8) & 0x3f;267 buffer[1] = div & 0xff;268 269 if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))270 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);271 272 if (debug) {273 if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5)))274 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);275 else276 tea5767_status_dump(priv, buffer);277 }278 279 priv->frequency = frq * 125 / 2;280 281 return 0;282}283 284static int tea5767_read_status(struct dvb_frontend *fe, char *buffer)285{286 struct tea5767_priv *priv = fe->tuner_priv;287 int rc;288 289 memset(buffer, 0, 5);290 if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5))) {291 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);292 return -EREMOTEIO;293 }294 295 return 0;296}297 298static inline int tea5767_signal(struct dvb_frontend *fe, const char *buffer)299{300 struct tea5767_priv *priv = fe->tuner_priv;301 302 int signal = ((buffer[3] & TEA5767_ADC_LEVEL_MASK) << 8);303 304 tuner_dbg("Signal strength: %d\n", signal);305 306 return signal;307}308 309static inline int tea5767_stereo(struct dvb_frontend *fe, const char *buffer)310{311 struct tea5767_priv *priv = fe->tuner_priv;312 313 int stereo = buffer[2] & TEA5767_STEREO_MASK;314 315 tuner_dbg("Radio ST GET = %02x\n", stereo);316 317 return (stereo ? V4L2_TUNER_SUB_STEREO : 0);318}319 320static int tea5767_get_status(struct dvb_frontend *fe, u32 *status)321{322 unsigned char buffer[5];323 324 *status = 0;325 326 if (0 == tea5767_read_status(fe, buffer)) {327 if (tea5767_signal(fe, buffer))328 *status = TUNER_STATUS_LOCKED;329 if (tea5767_stereo(fe, buffer))330 *status |= TUNER_STATUS_STEREO;331 }332 333 return 0;334}335 336static int tea5767_get_rf_strength(struct dvb_frontend *fe, u16 *strength)337{338 unsigned char buffer[5];339 340 *strength = 0;341 342 if (0 == tea5767_read_status(fe, buffer))343 *strength = tea5767_signal(fe, buffer);344 345 return 0;346}347 348static int tea5767_standby(struct dvb_frontend *fe)349{350 unsigned char buffer[5];351 struct tea5767_priv *priv = fe->tuner_priv;352 unsigned div, rc;353 354 div = (87500 * 4 + 700 + 225 + 25) / 50; /* Set frequency to 87.5 MHz */355 buffer[0] = (div >> 8) & 0x3f;356 buffer[1] = div & 0xff;357 buffer[2] = TEA5767_PORT1_HIGH;358 buffer[3] = TEA5767_PORT2_HIGH | TEA5767_HIGH_CUT_CTRL |359 TEA5767_ST_NOISE_CTL | TEA5767_JAPAN_BAND | TEA5767_STDBY;360 buffer[4] = 0;361 362 if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))363 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);364 365 return 0;366}367 368int tea5767_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)369{370 struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };371 unsigned char buffer[7] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };372 373 int rc;374 375 if ((rc = tuner_i2c_xfer_recv(&i2c, buffer, 7))< 5) {376 pr_warn("It is not a TEA5767. Received %i bytes.\n", rc);377 return -EINVAL;378 }379 380 /* If all bytes are the same then it's a TV tuner and not a tea5767 */381 if (buffer[0] == buffer[1] && buffer[0] == buffer[2] &&382 buffer[0] == buffer[3] && buffer[0] == buffer[4]) {383 pr_warn("All bytes are equal. It is not a TEA5767\n");384 return -EINVAL;385 }386 387 /* Status bytes:388 * Byte 4: bit 3:1 : CI (Chip Identification) == 0389 * bit 0 : internally set to 0390 * Byte 5: bit 7:0 : == 0391 */392 if (((buffer[3] & 0x0f) != 0x00) || (buffer[4] != 0x00)) {393 pr_warn("Chip ID is not zero. It is not a TEA5767\n");394 return -EINVAL;395 }396 397 398 return 0;399}400 401static void tea5767_release(struct dvb_frontend *fe)402{403 kfree(fe->tuner_priv);404 fe->tuner_priv = NULL;405}406 407static int tea5767_get_frequency(struct dvb_frontend *fe, u32 *frequency)408{409 struct tea5767_priv *priv = fe->tuner_priv;410 *frequency = priv->frequency;411 412 return 0;413}414 415static int tea5767_set_config (struct dvb_frontend *fe, void *priv_cfg)416{417 struct tea5767_priv *priv = fe->tuner_priv;418 419 memcpy(&priv->ctrl, priv_cfg, sizeof(priv->ctrl));420 421 return 0;422}423 424static const struct dvb_tuner_ops tea5767_tuner_ops = {425 .info = {426 .name = "tea5767", // Philips TEA5767HN FM Radio427 },428 429 .set_analog_params = set_radio_freq,430 .set_config = tea5767_set_config,431 .sleep = tea5767_standby,432 .release = tea5767_release,433 .get_frequency = tea5767_get_frequency,434 .get_status = tea5767_get_status,435 .get_rf_strength = tea5767_get_rf_strength,436};437 438struct dvb_frontend *tea5767_attach(struct dvb_frontend *fe,439 struct i2c_adapter* i2c_adap,440 u8 i2c_addr)441{442 struct tea5767_priv *priv = NULL;443 444 priv = kzalloc(sizeof(struct tea5767_priv), GFP_KERNEL);445 if (priv == NULL)446 return NULL;447 fe->tuner_priv = priv;448 449 priv->i2c_props.addr = i2c_addr;450 priv->i2c_props.adap = i2c_adap;451 priv->i2c_props.name = "tea5767";452 453 priv->ctrl.xtal_freq = TEA5767_HIGH_LO_32768;454 priv->ctrl.port1 = 1;455 priv->ctrl.port2 = 1;456 priv->ctrl.high_cut = 1;457 priv->ctrl.st_noise = 1;458 priv->ctrl.japan_band = 1;459 460 memcpy(&fe->ops.tuner_ops, &tea5767_tuner_ops,461 sizeof(struct dvb_tuner_ops));462 463 tuner_info("type set to %s\n", "Philips TEA5767HN FM Radio");464 465 return fe;466}467 468EXPORT_SYMBOL_GPL(tea5767_attach);469EXPORT_SYMBOL_GPL(tea5767_autodetection);470 471MODULE_DESCRIPTION("Philips TEA5767 FM tuner driver");472MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");473MODULE_LICENSE("GPL v2");474