LXR linux/drivers/media/common/tuners/tea5761.c

   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/delay.h>
  12#include <linux/videodev2.h>
  13#include <media/tuner.h>
  14#include "tuner-i2c.h"
  15#include "tea5761.h"
  16
  17static int debug;
  18module_param(debug, int, 0644);
  19MODULE_PARM_DESC(debug, "enable verbose debug messages");
  20
  21struct tea5761_priv {
  22        struct tuner_i2c_props i2c_props;
  23
  24        u32 frequency;
  25};
  26
  27/*****************************************************************************/
  28
  29/***************************
  30 * TEA5761HN I2C registers *
  31 ***************************/
  32
  33/* INTREG - Read: bytes 0 and 1 / Write: byte 0 */
  34
  35        /* first byte for reading */
  36#define TEA5761_INTREG_IFFLAG           0x10
  37#define TEA5761_INTREG_LEVFLAG          0x8
  38#define TEA5761_INTREG_FRRFLAG          0x2
  39#define TEA5761_INTREG_BLFLAG           0x1
  40
  41        /* second byte for reading / byte for writing */
  42#define TEA5761_INTREG_IFMSK            0x10
  43#define TEA5761_INTREG_LEVMSK           0x8
  44#define TEA5761_INTREG_FRMSK            0x2
  45#define TEA5761_INTREG_BLMSK            0x1
  46
  47/* FRQSET - Read: bytes 2 and 3 / Write: byte 1 and 2 */
  48
  49        /* First byte */
  50#define TEA5761_FRQSET_SEARCH_UP 0x80           /* 1=Station search from botton to up */
  51#define TEA5761_FRQSET_SEARCH_MODE 0x40         /* 1=Search mode */
  52
  53        /* Bits 0-5 for divider MSB */
  54
  55        /* Second byte */
  56        /* Bits 0-7 for divider LSB */
  57
  58/* TNCTRL - Read: bytes 4 and 5 / Write: Bytes 3 and 4 */
  59
  60        /* first byte */
  61
  62#define TEA5761_TNCTRL_PUPD_0   0x40    /* Power UP/Power Down MSB */
  63#define TEA5761_TNCTRL_BLIM     0X20    /* 1= Japan Frequencies, 0= European frequencies */
  64#define TEA5761_TNCTRL_SWPM     0x10    /* 1= software port is FRRFLAG */
  65#define TEA5761_TNCTRL_IFCTC    0x08    /* 1= IF count time 15.02 ms, 0= IF count time 2.02 ms */
  66#define TEA5761_TNCTRL_AFM      0x04
  67#define TEA5761_TNCTRL_SMUTE    0x02    /* 1= Soft mute */
  68#define TEA5761_TNCTRL_SNC      0x01
  69
  70        /* second byte */
  71
  72#define TEA5761_TNCTRL_MU       0x80    /* 1=Hard mute */
  73#define TEA5761_TNCTRL_SSL_1    0x40
  74#define TEA5761_TNCTRL_SSL_0    0x20
  75#define TEA5761_TNCTRL_HLSI     0x10
  76#define TEA5761_TNCTRL_MST      0x08    /* 1 = mono */
  77#define TEA5761_TNCTRL_SWP      0x04
  78#define TEA5761_TNCTRL_DTC      0x02    /* 1 = deemphasis 50 us, 0 = deemphasis 75 us */
  79#define TEA5761_TNCTRL_AHLSI    0x01
  80
  81/* FRQCHECK - Read: bytes 6 and 7  */
  82        /* First byte */
  83
  84        /* Bits 0-5 for divider MSB */
  85
  86        /* Second byte */
  87        /* Bits 0-7 for divider LSB */
  88
  89/* TUNCHECK - Read: bytes 8 and 9  */
  90
  91        /* First byte */
  92#define TEA5761_TUNCHECK_IF_MASK        0x7e    /* IF count */
  93#define TEA5761_TUNCHECK_TUNTO          0x01
  94
  95        /* Second byte */
  96#define TEA5761_TUNCHECK_LEV_MASK       0xf0    /* Level Count */
  97#define TEA5761_TUNCHECK_LD             0x08
  98#define TEA5761_TUNCHECK_STEREO         0x04
  99
 100/* TESTREG - Read: bytes 10 and 11 / Write: bytes 5 and 6 */
 101
 102        /* All zero = no test mode */
 103
 104/* MANID - Read: bytes 12 and 13 */
 105
 106        /* First byte - should be 0x10 */
 107#define TEA5767_MANID_VERSION_MASK      0xf0    /* Version = 1 */
 108#define TEA5767_MANID_ID_MSB_MASK       0x0f    /* Manufacurer ID - should be 0 */
 109
 110        /* Second byte - Should be 0x2b */
 111
 112#define TEA5767_MANID_ID_LSB_MASK       0xfe    /* Manufacturer ID - should be 0x15 */
 113#define TEA5767_MANID_IDAV              0x01    /* 1 = Chip has ID, 0 = Chip has no ID */
 114
 115/* Chip ID - Read: bytes 14 and 15 */
 116
 117        /* First byte - should be 0x57 */
 118
 119        /* Second byte - should be 0x61 */
 120
 121/*****************************************************************************/
 122
 123#define FREQ_OFFSET 0 /* for TEA5767, it is 700 to give the right freq */
 124static void tea5761_status_dump(unsigned char *buffer)
 125{
 126        unsigned int div, frq;
 127
 128        div = ((buffer[2] & 0x3f) << 8) | buffer[3];
 129
 130        frq = 1000 * (div * 32768 / 1000 + FREQ_OFFSET + 225) / 4;      /* Freq in KHz */
 131
 132        printk(KERN_INFO "tea5761: Frequency %d.%03d KHz (divider = 0x%04x)\n",
 133               frq / 1000, frq % 1000, div);
 134}
 135
 136/* Freq should be specifyed at 62.5 Hz */
 137static int set_radio_freq(struct dvb_frontend *fe,
 138                          struct analog_parameters *params)
 139{
 140        struct tea5761_priv *priv = fe->tuner_priv;
 141        unsigned int frq = params->frequency;
 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 (params->mode == T_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 (params->audmode == V4L2_TUNER_MODE_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 tea5761_read_status(struct dvb_frontend *fe, char *buffer)
 179{
 180        struct tea5761_priv *priv = fe->tuner_priv;
 181        int rc;
 182
 183        memset(buffer, 0, 16);
 184        if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16))) {
 185                tuner_warn("i2c i/o error: rc == %d (should be 16)\n", rc);
 186                return -EREMOTEIO;
 187        }
 188
 189        return 0;
 190}
 191
 192static inline int tea5761_signal(struct dvb_frontend *fe, const char *buffer)
 193{
 194        struct tea5761_priv *priv = fe->tuner_priv;
 195
 196        int signal = ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4));
 197
 198        tuner_dbg("Signal strength: %d\n", signal);
 199
 200        return signal;
 201}
 202
 203static inline int tea5761_stereo(struct dvb_frontend *fe, const char *buffer)
 204{
 205        struct tea5761_priv *priv = fe->tuner_priv;
 206
 207        int stereo = buffer[9] & TEA5761_TUNCHECK_STEREO;
 208
 209        tuner_dbg("Radio ST GET = %02x\n", stereo);
 210
 211        return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
 212}
 213
 214static int tea5761_get_status(struct dvb_frontend *fe, u32 *status)
 215{
 216        unsigned char buffer[16];
 217
 218        *status = 0;
 219
 220        if (0 == tea5761_read_status(fe, buffer)) {
 221                if (tea5761_signal(fe, buffer))
 222                        *status = TUNER_STATUS_LOCKED;
 223                if (tea5761_stereo(fe, buffer))
 224                        *status |= TUNER_STATUS_STEREO;
 225        }
 226
 227        return 0;
 228}
 229
 230static int tea5761_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 231{
 232        unsigned char buffer[16];
 233
 234        *strength = 0;
 235
 236        if (0 == tea5761_read_status(fe, buffer))
 237                *strength = tea5761_signal(fe, buffer);
 238
 239        return 0;
 240}
 241
 242int tea5761_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
 243{
 244        unsigned char buffer[16];
 245        int rc;
 246        struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
 247
 248        if (16 != (rc = tuner_i2c_xfer_recv(&i2c, buffer, 16))) {
 249                printk(KERN_WARNING "it is not a TEA5761. Received %i chars.\n", rc);
 250                return -EINVAL;
 251        }
 252
 253        if ((buffer[13] != 0x2b) || (buffer[14] != 0x57) || (buffer[15] != 0x061)) {
 254                printk(KERN_WARNING "Manufacturer ID= 0x%02x, Chip ID = %02x%02x."
 255                                    " It is not a TEA5761\n",
 256                                    buffer[13], buffer[14], buffer[15]);
 257                return -EINVAL;
 258        }
 259        printk(KERN_WARNING "tea5761: TEA%02x%02x detected. "
 260                            "Manufacturer ID= 0x%02x\n",
 261                            buffer[14], buffer[15], buffer[13]);
 262
 263        return 0;
 264}
 265
 266static int tea5761_release(struct dvb_frontend *fe)
 267{
 268        kfree(fe->tuner_priv);
 269        fe->tuner_priv = NULL;
 270
 271        return 0;
 272}
 273
 274static int tea5761_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 275{
 276        struct tea5761_priv *priv = fe->tuner_priv;
 277        *frequency = priv->frequency;
 278        return 0;
 279}
 280
 281static struct dvb_tuner_ops tea5761_tuner_ops = {
 282        .info = {
 283                .name           = "tea5761", // Philips TEA5761HN FM Radio
 284        },
 285        .set_analog_params = set_radio_freq,
 286        .release           = tea5761_release,
 287        .get_frequency     = tea5761_get_frequency,
 288        .get_status        = tea5761_get_status,
 289        .get_rf_strength   = tea5761_get_rf_strength,
 290};
 291
 292struct dvb_frontend *tea5761_attach(struct dvb_frontend *fe,
 293                                    struct i2c_adapter* i2c_adap,
 294                                    u8 i2c_addr)
 295{
 296        struct tea5761_priv *priv = NULL;
 297
 298        if (tea5761_autodetection(i2c_adap, i2c_addr) != 0)
 299                return NULL;
 300
 301        priv = kzalloc(sizeof(struct tea5761_priv), GFP_KERNEL);
 302        if (priv == NULL)
 303                return NULL;
 304        fe->tuner_priv = priv;
 305
 306        priv->i2c_props.addr = i2c_addr;
 307        priv->i2c_props.adap = i2c_adap;
 308        priv->i2c_props.name = "tea5761";
 309
 310        memcpy(&fe->ops.tuner_ops, &tea5761_tuner_ops,
 311               sizeof(struct dvb_tuner_ops));
 312
 313        tuner_info("type set to %s\n", "Philips TEA5761HN FM Radio");
 314
 315        return fe;
 316}
 317
 318
 319EXPORT_SYMBOL_GPL(tea5761_attach);
 320EXPORT_SYMBOL_GPL(tea5761_autodetection);
 321
 322MODULE_DESCRIPTION("Philips TEA5761 FM tuner driver");
 323MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 324MODULE_LICENSE("GPL");
 325