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1// SPDX-License-Identifier: GPL-2.02// For Philips TEA5761 FM Chip3// I2C address is always 0x20 (0x10 at 7-bit mode).4//5// Copyright (c) 2005-2007 Mauro Carvalho Chehab <mchehab@kernel.org>6 7#include <linux/i2c.h>8#include <linux/slab.h>9#include <linux/delay.h>10#include <linux/videodev2.h>11#include <media/tuner.h>12#include "tuner-i2c.h"13#include "tea5761.h"14 15static int debug;16module_param(debug, int, 0644);17MODULE_PARM_DESC(debug, "enable verbose debug messages");18 19struct tea5761_priv {20 struct tuner_i2c_props i2c_props;21 22 u32 frequency;23 bool standby;24};25 26/*****************************************************************************/27 28/***************************29 * TEA5761HN I2C registers *30 ***************************/31 32/* INTREG - Read: bytes 0 and 1 / Write: byte 0 */33 34 /* first byte for reading */35#define TEA5761_INTREG_IFFLAG 0x1036#define TEA5761_INTREG_LEVFLAG 0x837#define TEA5761_INTREG_FRRFLAG 0x238#define TEA5761_INTREG_BLFLAG 0x139 40 /* second byte for reading / byte for writing */41#define TEA5761_INTREG_IFMSK 0x1042#define TEA5761_INTREG_LEVMSK 0x843#define TEA5761_INTREG_FRMSK 0x244#define TEA5761_INTREG_BLMSK 0x145 46/* FRQSET - Read: bytes 2 and 3 / Write: byte 1 and 2 */47 48 /* First byte */49#define TEA5761_FRQSET_SEARCH_UP 0x80 /* 1=Station search from botton to up */50#define TEA5761_FRQSET_SEARCH_MODE 0x40 /* 1=Search mode */51 52 /* Bits 0-5 for divider MSB */53 54 /* Second byte */55 /* Bits 0-7 for divider LSB */56 57/* TNCTRL - Read: bytes 4 and 5 / Write: Bytes 3 and 4 */58 59 /* first byte */60 61#define TEA5761_TNCTRL_PUPD_0 0x40 /* Power UP/Power Down MSB */62#define TEA5761_TNCTRL_BLIM 0X20 /* 1= Japan Frequencies, 0= European frequencies */63#define TEA5761_TNCTRL_SWPM 0x10 /* 1= software port is FRRFLAG */64#define TEA5761_TNCTRL_IFCTC 0x08 /* 1= IF count time 15.02 ms, 0= IF count time 2.02 ms */65#define TEA5761_TNCTRL_AFM 0x0466#define TEA5761_TNCTRL_SMUTE 0x02 /* 1= Soft mute */67#define TEA5761_TNCTRL_SNC 0x0168 69 /* second byte */70 71#define TEA5761_TNCTRL_MU 0x80 /* 1=Hard mute */72#define TEA5761_TNCTRL_SSL_1 0x4073#define TEA5761_TNCTRL_SSL_0 0x2074#define TEA5761_TNCTRL_HLSI 0x1075#define TEA5761_TNCTRL_MST 0x08 /* 1 = mono */76#define TEA5761_TNCTRL_SWP 0x0477#define TEA5761_TNCTRL_DTC 0x02 /* 1 = deemphasis 50 us, 0 = deemphasis 75 us */78#define TEA5761_TNCTRL_AHLSI 0x0179 80/* FRQCHECK - Read: bytes 6 and 7 */81 /* First byte */82 83 /* Bits 0-5 for divider MSB */84 85 /* Second byte */86 /* Bits 0-7 for divider LSB */87 88/* TUNCHECK - Read: bytes 8 and 9 */89 90 /* First byte */91#define TEA5761_TUNCHECK_IF_MASK 0x7e /* IF count */92#define TEA5761_TUNCHECK_TUNTO 0x0193 94 /* Second byte */95#define TEA5761_TUNCHECK_LEV_MASK 0xf0 /* Level Count */96#define TEA5761_TUNCHECK_LD 0x0897#define TEA5761_TUNCHECK_STEREO 0x0498 99/* TESTREG - Read: bytes 10 and 11 / Write: bytes 5 and 6 */100 101 /* All zero = no test mode */102 103/* MANID - Read: bytes 12 and 13 */104 105 /* First byte - should be 0x10 */106#define TEA5767_MANID_VERSION_MASK 0xf0 /* Version = 1 */107#define TEA5767_MANID_ID_MSB_MASK 0x0f /* Manufacurer ID - should be 0 */108 109 /* Second byte - Should be 0x2b */110 111#define TEA5767_MANID_ID_LSB_MASK 0xfe /* Manufacturer ID - should be 0x15 */112#define TEA5767_MANID_IDAV 0x01 /* 1 = Chip has ID, 0 = Chip has no ID */113 114/* Chip ID - Read: bytes 14 and 15 */115 116 /* First byte - should be 0x57 */117 118 /* Second byte - should be 0x61 */119 120/*****************************************************************************/121 122#define FREQ_OFFSET 0 /* for TEA5767, it is 700 to give the right freq */123static void tea5761_status_dump(unsigned char *buffer)124{125 unsigned int div, frq;126 127 div = ((buffer[2] & 0x3f) << 8) | buffer[3];128 129 frq = 1000 * (div * 32768 / 1000 + FREQ_OFFSET + 225) / 4; /* Freq in KHz */130 131 printk(KERN_INFO "tea5761: Frequency %d.%03d KHz (divider = 0x%04x)\n",132 frq / 1000, frq % 1000, div);133}134 135/* Freq should be specifyed at 62.5 Hz */136static int __set_radio_freq(struct dvb_frontend *fe,137 unsigned int freq,138 bool mono)139{140 struct tea5761_priv *priv = fe->tuner_priv;141 unsigned int frq = freq;142 unsigned char buffer[7] = {0, 0, 0, 0, 0, 0, 0 };143 unsigned div;144 int rc;145 146 tuner_dbg("radio freq counter %d\n", frq);147 148 if (priv->standby) {149 tuner_dbg("TEA5761 set to standby mode\n");150 buffer[5] |= TEA5761_TNCTRL_MU;151 } else {152 buffer[4] |= TEA5761_TNCTRL_PUPD_0;153 }154 155 156 if (mono) {157 tuner_dbg("TEA5761 set to mono\n");158 buffer[5] |= TEA5761_TNCTRL_MST;159 } else {160 tuner_dbg("TEA5761 set to stereo\n");161 }162 163 div = (1000 * (frq * 4 / 16 + 700 + 225) ) >> 15;164 buffer[1] = (div >> 8) & 0x3f;165 buffer[2] = div & 0xff;166 167 if (debug)168 tea5761_status_dump(buffer);169 170 if (7 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 7)))171 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);172 173 priv->frequency = frq * 125 / 2;174 175 return 0;176}177 178static int set_radio_freq(struct dvb_frontend *fe,179 struct analog_parameters *params)180{181 struct tea5761_priv *priv = fe->analog_demod_priv;182 183 priv->standby = false;184 185 return __set_radio_freq(fe, params->frequency,186 params->audmode == V4L2_TUNER_MODE_MONO);187}188 189static int set_radio_sleep(struct dvb_frontend *fe)190{191 struct tea5761_priv *priv = fe->analog_demod_priv;192 193 priv->standby = true;194 195 return __set_radio_freq(fe, priv->frequency, false);196}197 198static int tea5761_read_status(struct dvb_frontend *fe, char *buffer)199{200 struct tea5761_priv *priv = fe->tuner_priv;201 int rc;202 203 memset(buffer, 0, 16);204 if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16))) {205 tuner_warn("i2c i/o error: rc == %d (should be 16)\n", rc);206 return -EREMOTEIO;207 }208 209 return 0;210}211 212static inline int tea5761_signal(struct dvb_frontend *fe, const char *buffer)213{214 struct tea5761_priv *priv = fe->tuner_priv;215 216 int signal = ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4));217 218 tuner_dbg("Signal strength: %d\n", signal);219 220 return signal;221}222 223static inline int tea5761_stereo(struct dvb_frontend *fe, const char *buffer)224{225 struct tea5761_priv *priv = fe->tuner_priv;226 227 int stereo = buffer[9] & TEA5761_TUNCHECK_STEREO;228 229 tuner_dbg("Radio ST GET = %02x\n", stereo);230 231 return (stereo ? V4L2_TUNER_SUB_STEREO : 0);232}233 234static int tea5761_get_status(struct dvb_frontend *fe, u32 *status)235{236 unsigned char buffer[16];237 238 *status = 0;239 240 if (0 == tea5761_read_status(fe, buffer)) {241 if (tea5761_signal(fe, buffer))242 *status = TUNER_STATUS_LOCKED;243 if (tea5761_stereo(fe, buffer))244 *status |= TUNER_STATUS_STEREO;245 }246 247 return 0;248}249 250static int tea5761_get_rf_strength(struct dvb_frontend *fe, u16 *strength)251{252 unsigned char buffer[16];253 254 *strength = 0;255 256 if (0 == tea5761_read_status(fe, buffer))257 *strength = tea5761_signal(fe, buffer);258 259 return 0;260}261 262int tea5761_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)263{264 unsigned char buffer[16];265 int rc;266 struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };267 268 if (16 != (rc = tuner_i2c_xfer_recv(&i2c, buffer, 16))) {269 printk(KERN_WARNING "it is not a TEA5761. Received %i chars.\n", rc);270 return -EINVAL;271 }272 273 if ((buffer[13] != 0x2b) || (buffer[14] != 0x57) || (buffer[15] != 0x061)) {274 printk(KERN_WARNING "Manufacturer ID= 0x%02x, Chip ID = %02x%02x. It is not a TEA5761\n",275 buffer[13], buffer[14], buffer[15]);276 return -EINVAL;277 }278 printk(KERN_WARNING "tea5761: TEA%02x%02x detected. Manufacturer ID= 0x%02x\n",279 buffer[14], buffer[15], buffer[13]);280 281 return 0;282}283 284static void tea5761_release(struct dvb_frontend *fe)285{286 kfree(fe->tuner_priv);287 fe->tuner_priv = NULL;288}289 290static int tea5761_get_frequency(struct dvb_frontend *fe, u32 *frequency)291{292 struct tea5761_priv *priv = fe->tuner_priv;293 *frequency = priv->frequency;294 return 0;295}296 297static const struct dvb_tuner_ops tea5761_tuner_ops = {298 .info = {299 .name = "tea5761", // Philips TEA5761HN FM Radio300 },301 .set_analog_params = set_radio_freq,302 .sleep = set_radio_sleep,303 .release = tea5761_release,304 .get_frequency = tea5761_get_frequency,305 .get_status = tea5761_get_status,306 .get_rf_strength = tea5761_get_rf_strength,307};308 309struct dvb_frontend *tea5761_attach(struct dvb_frontend *fe,310 struct i2c_adapter* i2c_adap,311 u8 i2c_addr)312{313 struct tea5761_priv *priv = NULL;314 315 if (tea5761_autodetection(i2c_adap, i2c_addr) != 0)316 return NULL;317 318 priv = kzalloc(sizeof(struct tea5761_priv), GFP_KERNEL);319 if (priv == NULL)320 return NULL;321 fe->tuner_priv = priv;322 323 priv->i2c_props.addr = i2c_addr;324 priv->i2c_props.adap = i2c_adap;325 priv->i2c_props.name = "tea5761";326 327 memcpy(&fe->ops.tuner_ops, &tea5761_tuner_ops,328 sizeof(struct dvb_tuner_ops));329 330 tuner_info("type set to %s\n", "Philips TEA5761HN FM Radio");331 332 return fe;333}334 335 336EXPORT_SYMBOL_GPL(tea5761_attach);337EXPORT_SYMBOL_GPL(tea5761_autodetection);338 339MODULE_DESCRIPTION("Philips TEA5761 FM tuner driver");340MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");341MODULE_LICENSE("GPL v2");342