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
  17 static int debug;
  18 module_param(debug, int, 0644);
  19 MODULE_PARM_DESC(debug, "enable verbose debug messages");
  20
  21 struct 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 */
 124 static 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 */
 137 static 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
 178 static 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
 192 static 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
 203 static 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
 214 static 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
 230 static 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
 242 int 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
 266 static int tea5761_release(struct dvb_frontend *fe)
 267 {
 268         kfree(fe->tuner_priv);
 269         fe->tuner_priv = NULL;
 270
 271         return 0;
 272 }
 273
 274 static 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
 281 static 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
 292 struct 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
 319 EXPORT_SYMBOL_GPL(tea5761_attach);
 320 EXPORT_SYMBOL_GPL(tea5761_autodetection);
 321
 322 MODULE_DESCRIPTION("Philips TEA5761 FM tuner driver");
 323 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 324 MODULE_LICENSE("GPL");