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