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
  17 static int debug = 0;
  18 module_param(debug, int, 0644);
  19 MODULE_PARM_DESC(debug, "enable verbose debug messages");
  20
  21 #define PREFIX "tea5761"
  22
  23 struct 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 */
 126 static 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 */
 139 static 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
 180 static 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
 194 static 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
 205 static 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
 216 static 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
 232 static 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
 244 int 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
 263 static int tea5761_release(struct dvb_frontend *fe)
 264 {
 265         kfree(fe->tuner_priv);
 266         fe->tuner_priv = NULL;
 267
 268         return 0;
 269 }
 270
 271 static 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
 278 static 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
 289 struct 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
 315 EXPORT_SYMBOL_GPL(tea5761_attach);
 316 EXPORT_SYMBOL_GPL(tea5761_autodetection);
 317
 318 MODULE_DESCRIPTION("Philips TEA5761 FM tuner driver");
 319 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 320 MODULE_LICENSE("GPL");