linux/drivers/media/common/tuners/tea5761.c
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   1/*
   2 * For Philips TEA5761 FM Chip
   3 * I2C address is allways 0x20 (0x10 at 7-bit mode).
   4 *
   5 * Copyright (c) 2005-2007 Mauro Carvalho Chehab (mchehab@infradead.org)
   6 * This code is placed under the terms of the GNUv2 General Public License
   7 *
   8 */
   9
  10#include <linux/i2c.h>
  11#include <linux/slab.h>
  12#include <linux/delay.h>
  13#include <linux/videodev2.h>
  14#include <media/tuner.h>
  15#include "tuner-i2c.h"
  16#include "tea5761.h"
  17
  18static int debug;
  19module_param(debug, int, 0644);
  20MODULE_PARM_DESC(debug, "enable verbose debug messages");
  21
  22struct tea5761_priv {
  23        struct tuner_i2c_props i2c_props;
  24
  25        u32 frequency;
  26};
  27
  28/*****************************************************************************/
  29
  30/***************************
  31 * TEA5761HN I2C registers *
  32 ***************************/
  33
  34/* INTREG - Read: bytes 0 and 1 / Write: byte 0 */
  35
  36        /* first byte for reading */
  37#define TEA5761_INTREG_IFFLAG           0x10
  38#define TEA5761_INTREG_LEVFLAG          0x8
  39#define TEA5761_INTREG_FRRFLAG          0x2
  40#define TEA5761_INTREG_BLFLAG           0x1
  41
  42        /* second byte for reading / byte for writing */
  43#define TEA5761_INTREG_IFMSK            0x10
  44#define TEA5761_INTREG_LEVMSK           0x8
  45#define TEA5761_INTREG_FRMSK            0x2
  46#define TEA5761_INTREG_BLMSK            0x1
  47
  48/* FRQSET - Read: bytes 2 and 3 / Write: byte 1 and 2 */
  49
  50        /* First byte */
  51#define TEA5761_FRQSET_SEARCH_UP 0x80           /* 1=Station search from botton to up */
  52#define TEA5761_FRQSET_SEARCH_MODE 0x40         /* 1=Search mode */
  53
  54        /* Bits 0-5 for divider MSB */
  55
  56        /* Second byte */
  57        /* Bits 0-7 for divider LSB */
  58
  59/* TNCTRL - Read: bytes 4 and 5 / Write: Bytes 3 and 4 */
  60
  61        /* first byte */
  62
  63#define TEA5761_TNCTRL_PUPD_0   0x40    /* Power UP/Power Down MSB */
  64#define TEA5761_TNCTRL_BLIM     0X20    /* 1= Japan Frequencies, 0= European frequencies */
  65#define TEA5761_TNCTRL_SWPM     0x10    /* 1= software port is FRRFLAG */
  66#define TEA5761_TNCTRL_IFCTC    0x08    /* 1= IF count time 15.02 ms, 0= IF count time 2.02 ms */
  67#define TEA5761_TNCTRL_AFM      0x04
  68#define TEA5761_TNCTRL_SMUTE    0x02    /* 1= Soft mute */
  69#define TEA5761_TNCTRL_SNC      0x01
  70
  71        /* second byte */
  72
  73#define TEA5761_TNCTRL_MU       0x80    /* 1=Hard mute */
  74#define TEA5761_TNCTRL_SSL_1    0x40
  75#define TEA5761_TNCTRL_SSL_0    0x20
  76#define TEA5761_TNCTRL_HLSI     0x10
  77#define TEA5761_TNCTRL_MST      0x08    /* 1 = mono */
  78#define TEA5761_TNCTRL_SWP      0x04
  79#define TEA5761_TNCTRL_DTC      0x02    /* 1 = deemphasis 50 us, 0 = deemphasis 75 us */
  80#define TEA5761_TNCTRL_AHLSI    0x01
  81
  82/* FRQCHECK - Read: bytes 6 and 7  */
  83        /* First byte */
  84
  85        /* Bits 0-5 for divider MSB */
  86
  87        /* Second byte */
  88        /* Bits 0-7 for divider LSB */
  89
  90/* TUNCHECK - Read: bytes 8 and 9  */
  91
  92        /* First byte */
  93#define TEA5761_TUNCHECK_IF_MASK        0x7e    /* IF count */
  94#define TEA5761_TUNCHECK_TUNTO          0x01
  95
  96        /* Second byte */
  97#define TEA5761_TUNCHECK_LEV_MASK       0xf0    /* Level Count */
  98#define TEA5761_TUNCHECK_LD             0x08
  99#define TEA5761_TUNCHECK_STEREO         0x04
 100
 101/* TESTREG - Read: bytes 10 and 11 / Write: bytes 5 and 6 */
 102
 103        /* All zero = no test mode */
 104
 105/* MANID - Read: bytes 12 and 13 */
 106
 107        /* First byte - should be 0x10 */
 108#define TEA5767_MANID_VERSION_MASK      0xf0    /* Version = 1 */
 109#define TEA5767_MANID_ID_MSB_MASK       0x0f    /* Manufacurer ID - should be 0 */
 110
 111        /* Second byte - Should be 0x2b */
 112
 113#define TEA5767_MANID_ID_LSB_MASK       0xfe    /* Manufacturer ID - should be 0x15 */
 114#define TEA5767_MANID_IDAV              0x01    /* 1 = Chip has ID, 0 = Chip has no ID */
 115
 116/* Chip ID - Read: bytes 14 and 15 */
 117
 118        /* First byte - should be 0x57 */
 119
 120        /* Second byte - should be 0x61 */
 121
 122/*****************************************************************************/
 123
 124#define FREQ_OFFSET 0 /* for TEA5767, it is 700 to give the right freq */
 125static void tea5761_status_dump(unsigned char *buffer)
 126{
 127        unsigned int div, frq;
 128
 129        div = ((buffer[2] & 0x3f) << 8) | buffer[3];
 130
 131        frq = 1000 * (div * 32768 / 1000 + FREQ_OFFSET + 225) / 4;      /* Freq in KHz */
 132
 133        printk(KERN_INFO "tea5761: Frequency %d.%03d KHz (divider = 0x%04x)\n",
 134               frq / 1000, frq % 1000, div);
 135}
 136
 137/* Freq should be specifyed at 62.5 Hz */
 138static int set_radio_freq(struct dvb_frontend *fe,
 139                          struct analog_parameters *params)
 140{
 141        struct tea5761_priv *priv = fe->tuner_priv;
 142        unsigned int frq = params->frequency;
 143        unsigned char buffer[7] = {0, 0, 0, 0, 0, 0, 0 };
 144        unsigned div;
 145        int rc;
 146
 147        tuner_dbg("radio freq counter %d\n", frq);
 148
 149        if (params->mode == T_STANDBY) {
 150                tuner_dbg("TEA5761 set to standby mode\n");
 151                buffer[5] |= TEA5761_TNCTRL_MU;
 152        } else {
 153                buffer[4] |= TEA5761_TNCTRL_PUPD_0;
 154        }
 155
 156
 157        if (params->audmode == V4L2_TUNER_MODE_MONO) {
 158                tuner_dbg("TEA5761 set to mono\n");
 159                buffer[5] |= TEA5761_TNCTRL_MST;
 160        } else {
 161                tuner_dbg("TEA5761 set to stereo\n");
 162        }
 163
 164        div = (1000 * (frq * 4 / 16 + 700 + 225) ) >> 15;
 165        buffer[1] = (div >> 8) & 0x3f;
 166        buffer[2] = div & 0xff;
 167
 168        if (debug)
 169                tea5761_status_dump(buffer);
 170
 171        if (7 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 7)))
 172                tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 173
 174        priv->frequency = frq * 125 / 2;
 175
 176        return 0;
 177}
 178
 179static int tea5761_read_status(struct dvb_frontend *fe, char *buffer)
 180{
 181        struct tea5761_priv *priv = fe->tuner_priv;
 182        int rc;
 183
 184        memset(buffer, 0, 16);
 185        if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16))) {
 186                tuner_warn("i2c i/o error: rc == %d (should be 16)\n", rc);
 187                return -EREMOTEIO;
 188        }
 189
 190        return 0;
 191}
 192
 193static inline int tea5761_signal(struct dvb_frontend *fe, const char *buffer)
 194{
 195        struct tea5761_priv *priv = fe->tuner_priv;
 196
 197        int signal = ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4));
 198
 199        tuner_dbg("Signal strength: %d\n", signal);
 200
 201        return signal;
 202}
 203
 204static inline int tea5761_stereo(struct dvb_frontend *fe, const char *buffer)
 205{
 206        struct tea5761_priv *priv = fe->tuner_priv;
 207
 208        int stereo = buffer[9] & TEA5761_TUNCHECK_STEREO;
 209
 210        tuner_dbg("Radio ST GET = %02x\n", stereo);
 211
 212        return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
 213}
 214
 215static int tea5761_get_status(struct dvb_frontend *fe, u32 *status)
 216{
 217        unsigned char buffer[16];
 218
 219        *status = 0;
 220
 221        if (0 == tea5761_read_status(fe, buffer)) {
 222                if (tea5761_signal(fe, buffer))
 223                        *status = TUNER_STATUS_LOCKED;
 224                if (tea5761_stereo(fe, buffer))
 225                        *status |= TUNER_STATUS_STEREO;
 226        }
 227
 228        return 0;
 229}
 230
 231static int tea5761_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 232{
 233        unsigned char buffer[16];
 234
 235        *strength = 0;
 236
 237        if (0 == tea5761_read_status(fe, buffer))
 238                *strength = tea5761_signal(fe, buffer);
 239
 240        return 0;
 241}
 242
 243int tea5761_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
 244{
 245        unsigned char buffer[16];
 246        int rc;
 247        struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
 248
 249        if (16 != (rc = tuner_i2c_xfer_recv(&i2c, buffer, 16))) {
 250                printk(KERN_WARNING "it is not a TEA5761. Received %i chars.\n", rc);
 251                return -EINVAL;
 252        }
 253
 254        if ((buffer[13] != 0x2b) || (buffer[14] != 0x57) || (buffer[15] != 0x061)) {
 255                printk(KERN_WARNING "Manufacturer ID= 0x%02x, Chip ID = %02x%02x."
 256                                    " It is not a TEA5761\n",
 257                                    buffer[13], buffer[14], buffer[15]);
 258                return -EINVAL;
 259        }
 260        printk(KERN_WARNING "tea5761: TEA%02x%02x detected. "
 261                            "Manufacturer ID= 0x%02x\n",
 262                            buffer[14], buffer[15], buffer[13]);
 263
 264        return 0;
 265}
 266
 267static int tea5761_release(struct dvb_frontend *fe)
 268{
 269        kfree(fe->tuner_priv);
 270        fe->tuner_priv = NULL;
 271
 272        return 0;
 273}
 274
 275static int tea5761_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 276{
 277        struct tea5761_priv *priv = fe->tuner_priv;
 278        *frequency = priv->frequency;
 279        return 0;
 280}
 281
 282static struct dvb_tuner_ops tea5761_tuner_ops = {
 283        .info = {
 284                .name           = "tea5761", // Philips TEA5761HN FM Radio
 285        },
 286        .set_analog_params = set_radio_freq,
 287        .release           = tea5761_release,
 288        .get_frequency     = tea5761_get_frequency,
 289        .get_status        = tea5761_get_status,
 290        .get_rf_strength   = tea5761_get_rf_strength,
 291};
 292
 293struct dvb_frontend *tea5761_attach(struct dvb_frontend *fe,
 294                                    struct i2c_adapter* i2c_adap,
 295                                    u8 i2c_addr)
 296{
 297        struct tea5761_priv *priv = NULL;
 298
 299        if (tea5761_autodetection(i2c_adap, i2c_addr) != 0)
 300                return NULL;
 301
 302        priv = kzalloc(sizeof(struct tea5761_priv), GFP_KERNEL);
 303        if (priv == NULL)
 304                return NULL;
 305        fe->tuner_priv = priv;
 306
 307        priv->i2c_props.addr = i2c_addr;
 308        priv->i2c_props.adap = i2c_adap;
 309        priv->i2c_props.name = "tea5761";
 310
 311        memcpy(&fe->ops.tuner_ops, &tea5761_tuner_ops,
 312               sizeof(struct dvb_tuner_ops));
 313
 314        tuner_info("type set to %s\n", "Philips TEA5761HN FM Radio");
 315
 316        return fe;
 317}
 318
 319
 320EXPORT_SYMBOL_GPL(tea5761_attach);
 321EXPORT_SYMBOL_GPL(tea5761_autodetection);
 322
 323MODULE_DESCRIPTION("Philips TEA5761 FM tuner driver");
 324MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 325MODULE_LICENSE("GPL");
 326