drivers/media/tuners/tea5761.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // For Philips TEA5761 FM Chip
   3 // I2C address is always 0x20 (0x10 at 7-bit mode).
   4 //
   5 // Copyright (c) 2005-2007 Mauro Carvalho Chehab (mchehab@infradead.org)
   6
   7 #include <linux/i2c.h>
   8 #include <linux/slab.h>
   9 #include <linux/delay.h>
  10 #include <linux/videodev2.h>
  11 #include <media/tuner.h>
  12 #include "tuner-i2c.h"
  13 #include "tea5761.h"
  14
  15 static int debug;
  16 module_param(debug, int, 0644);
  17 MODULE_PARM_DESC(debug, "enable verbose debug messages");
  18
  19 struct tea5761_priv {
  20         struct tuner_i2c_props i2c_props;
  21
  22         u32 frequency;
  23         bool standby;
  24 };
  25
  26 /*****************************************************************************/
  27
  28 /***************************
  29  * TEA5761HN I2C registers *
  30  ***************************/
  31
  32 /* INTREG - Read: bytes 0 and 1 / Write: byte 0 */
  33
  34         /* first byte for reading */
  35 #define TEA5761_INTREG_IFFLAG           0x10
  36 #define TEA5761_INTREG_LEVFLAG          0x8
  37 #define TEA5761_INTREG_FRRFLAG          0x2
  38 #define TEA5761_INTREG_BLFLAG           0x1
  39
  40         /* second byte for reading / byte for writing */
  41 #define TEA5761_INTREG_IFMSK            0x10
  42 #define TEA5761_INTREG_LEVMSK           0x8
  43 #define TEA5761_INTREG_FRMSK            0x2
  44 #define TEA5761_INTREG_BLMSK            0x1
  45
  46 /* FRQSET - Read: bytes 2 and 3 / Write: byte 1 and 2 */
  47
  48         /* First byte */
  49 #define TEA5761_FRQSET_SEARCH_UP 0x80           /* 1=Station search from botton to up */
  50 #define TEA5761_FRQSET_SEARCH_MODE 0x40         /* 1=Search mode */
  51
  52         /* Bits 0-5 for divider MSB */
  53
  54         /* Second byte */
  55         /* Bits 0-7 for divider LSB */
  56
  57 /* TNCTRL - Read: bytes 4 and 5 / Write: Bytes 3 and 4 */
  58
  59         /* first byte */
  60
  61 #define TEA5761_TNCTRL_PUPD_0   0x40    /* Power UP/Power Down MSB */
  62 #define TEA5761_TNCTRL_BLIM     0X20    /* 1= Japan Frequencies, 0= European frequencies */
  63 #define TEA5761_TNCTRL_SWPM     0x10    /* 1= software port is FRRFLAG */
  64 #define TEA5761_TNCTRL_IFCTC    0x08    /* 1= IF count time 15.02 ms, 0= IF count time 2.02 ms */
  65 #define TEA5761_TNCTRL_AFM      0x04
  66 #define TEA5761_TNCTRL_SMUTE    0x02    /* 1= Soft mute */
  67 #define TEA5761_TNCTRL_SNC      0x01
  68
  69         /* second byte */
  70
  71 #define TEA5761_TNCTRL_MU       0x80    /* 1=Hard mute */
  72 #define TEA5761_TNCTRL_SSL_1    0x40
  73 #define TEA5761_TNCTRL_SSL_0    0x20
  74 #define TEA5761_TNCTRL_HLSI     0x10
  75 #define TEA5761_TNCTRL_MST      0x08    /* 1 = mono */
  76 #define TEA5761_TNCTRL_SWP      0x04
  77 #define TEA5761_TNCTRL_DTC      0x02    /* 1 = deemphasis 50 us, 0 = deemphasis 75 us */
  78 #define TEA5761_TNCTRL_AHLSI    0x01
  79
  80 /* FRQCHECK - Read: bytes 6 and 7  */
  81         /* First byte */
  82
  83         /* Bits 0-5 for divider MSB */
  84
  85         /* Second byte */
  86         /* Bits 0-7 for divider LSB */
  87
  88 /* TUNCHECK - Read: bytes 8 and 9  */
  89
  90         /* First byte */
  91 #define TEA5761_TUNCHECK_IF_MASK        0x7e    /* IF count */
  92 #define TEA5761_TUNCHECK_TUNTO          0x01
  93
  94         /* Second byte */
  95 #define TEA5761_TUNCHECK_LEV_MASK       0xf0    /* Level Count */
  96 #define TEA5761_TUNCHECK_LD             0x08
  97 #define TEA5761_TUNCHECK_STEREO         0x04
  98
  99 /* TESTREG - Read: bytes 10 and 11 / Write: bytes 5 and 6 */
 100
 101         /* All zero = no test mode */
 102
 103 /* MANID - Read: bytes 12 and 13 */
 104
 105         /* First byte - should be 0x10 */
 106 #define TEA5767_MANID_VERSION_MASK      0xf0    /* Version = 1 */
 107 #define TEA5767_MANID_ID_MSB_MASK       0x0f    /* Manufacurer ID - should be 0 */
 108
 109         /* Second byte - Should be 0x2b */
 110
 111 #define TEA5767_MANID_ID_LSB_MASK       0xfe    /* Manufacturer ID - should be 0x15 */
 112 #define TEA5767_MANID_IDAV              0x01    /* 1 = Chip has ID, 0 = Chip has no ID */
 113
 114 /* Chip ID - Read: bytes 14 and 15 */
 115
 116         /* First byte - should be 0x57 */
 117
 118         /* Second byte - should be 0x61 */
 119
 120 /*****************************************************************************/
 121
 122 #define FREQ_OFFSET 0 /* for TEA5767, it is 700 to give the right freq */
 123 static void tea5761_status_dump(unsigned char *buffer)
 124 {
 125         unsigned int div, frq;
 126
 127         div = ((buffer[2] & 0x3f) << 8) | buffer[3];
 128
 129         frq = 1000 * (div * 32768 / 1000 + FREQ_OFFSET + 225) / 4;      /* Freq in KHz */
 130
 131         printk(KERN_INFO "tea5761: Frequency %d.%03d KHz (divider = 0x%04x)\n",
 132                frq / 1000, frq % 1000, div);
 133 }
 134
 135 /* Freq should be specifyed at 62.5 Hz */
 136 static int __set_radio_freq(struct dvb_frontend *fe,
 137                             unsigned int freq,
 138                             bool mono)
 139 {
 140         struct tea5761_priv *priv = fe->tuner_priv;
 141         unsigned int frq = freq;
 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 (priv->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 (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 set_radio_freq(struct dvb_frontend *fe,
 179                           struct analog_parameters *params)
 180 {
 181         struct tea5761_priv *priv = fe->analog_demod_priv;
 182
 183         priv->standby = false;
 184
 185         return __set_radio_freq(fe, params->frequency,
 186                                 params->audmode == V4L2_TUNER_MODE_MONO);
 187 }
 188
 189 static int set_radio_sleep(struct dvb_frontend *fe)
 190 {
 191         struct tea5761_priv *priv = fe->analog_demod_priv;
 192
 193         priv->standby = true;
 194
 195         return __set_radio_freq(fe, priv->frequency, false);
 196 }
 197
 198 static int tea5761_read_status(struct dvb_frontend *fe, char *buffer)
 199 {
 200         struct tea5761_priv *priv = fe->tuner_priv;
 201         int rc;
 202
 203         memset(buffer, 0, 16);
 204         if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16))) {
 205                 tuner_warn("i2c i/o error: rc == %d (should be 16)\n", rc);
 206                 return -EREMOTEIO;
 207         }
 208
 209         return 0;
 210 }
 211
 212 static inline int tea5761_signal(struct dvb_frontend *fe, const char *buffer)
 213 {
 214         struct tea5761_priv *priv = fe->tuner_priv;
 215
 216         int signal = ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4));
 217
 218         tuner_dbg("Signal strength: %d\n", signal);
 219
 220         return signal;
 221 }
 222
 223 static inline int tea5761_stereo(struct dvb_frontend *fe, const char *buffer)
 224 {
 225         struct tea5761_priv *priv = fe->tuner_priv;
 226
 227         int stereo = buffer[9] & TEA5761_TUNCHECK_STEREO;
 228
 229         tuner_dbg("Radio ST GET = %02x\n", stereo);
 230
 231         return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
 232 }
 233
 234 static int tea5761_get_status(struct dvb_frontend *fe, u32 *status)
 235 {
 236         unsigned char buffer[16];
 237
 238         *status = 0;
 239
 240         if (0 == tea5761_read_status(fe, buffer)) {
 241                 if (tea5761_signal(fe, buffer))
 242                         *status = TUNER_STATUS_LOCKED;
 243                 if (tea5761_stereo(fe, buffer))
 244                         *status |= TUNER_STATUS_STEREO;
 245         }
 246
 247         return 0;
 248 }
 249
 250 static int tea5761_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 251 {
 252         unsigned char buffer[16];
 253
 254         *strength = 0;
 255
 256         if (0 == tea5761_read_status(fe, buffer))
 257                 *strength = tea5761_signal(fe, buffer);
 258
 259         return 0;
 260 }
 261
 262 int tea5761_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
 263 {
 264         unsigned char buffer[16];
 265         int rc;
 266         struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
 267
 268         if (16 != (rc = tuner_i2c_xfer_recv(&i2c, buffer, 16))) {
 269                 printk(KERN_WARNING "it is not a TEA5761. Received %i chars.\n", rc);
 270                 return -EINVAL;
 271         }
 272
 273         if ((buffer[13] != 0x2b) || (buffer[14] != 0x57) || (buffer[15] != 0x061)) {
 274                 printk(KERN_WARNING "Manufacturer ID= 0x%02x, Chip ID = %02x%02x. It is not a TEA5761\n",
 275                                     buffer[13], buffer[14], buffer[15]);
 276                 return -EINVAL;
 277         }
 278         printk(KERN_WARNING "tea5761: TEA%02x%02x detected. Manufacturer ID= 0x%02x\n",
 279                             buffer[14], buffer[15], buffer[13]);
 280
 281         return 0;
 282 }
 283
 284 static void tea5761_release(struct dvb_frontend *fe)
 285 {
 286         kfree(fe->tuner_priv);
 287         fe->tuner_priv = NULL;
 288 }
 289
 290 static int tea5761_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 291 {
 292         struct tea5761_priv *priv = fe->tuner_priv;
 293         *frequency = priv->frequency;
 294         return 0;
 295 }
 296
 297 static const struct dvb_tuner_ops tea5761_tuner_ops = {
 298         .info = {
 299                 .name           = "tea5761", // Philips TEA5761HN FM Radio
 300         },
 301         .set_analog_params = set_radio_freq,
 302         .sleep             = set_radio_sleep,
 303         .release           = tea5761_release,
 304         .get_frequency     = tea5761_get_frequency,
 305         .get_status        = tea5761_get_status,
 306         .get_rf_strength   = tea5761_get_rf_strength,
 307 };
 308
 309 struct dvb_frontend *tea5761_attach(struct dvb_frontend *fe,
 310                                     struct i2c_adapter* i2c_adap,
 311                                     u8 i2c_addr)
 312 {
 313         struct tea5761_priv *priv = NULL;
 314
 315         if (tea5761_autodetection(i2c_adap, i2c_addr) != 0)
 316                 return NULL;
 317
 318         priv = kzalloc(sizeof(struct tea5761_priv), GFP_KERNEL);
 319         if (priv == NULL)
 320                 return NULL;
 321         fe->tuner_priv = priv;
 322
 323         priv->i2c_props.addr = i2c_addr;
 324         priv->i2c_props.adap = i2c_adap;
 325         priv->i2c_props.name = "tea5761";
 326
 327         memcpy(&fe->ops.tuner_ops, &tea5761_tuner_ops,
 328                sizeof(struct dvb_tuner_ops));
 329
 330         tuner_info("type set to %s\n", "Philips TEA5761HN FM Radio");
 331
 332         return fe;
 333 }
 334
 335
 336 EXPORT_SYMBOL_GPL(tea5761_attach);
 337 EXPORT_SYMBOL_GPL(tea5761_autodetection);
 338
 339 MODULE_DESCRIPTION("Philips TEA5761 FM tuner driver");
 340 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 341 MODULE_LICENSE("GPL v2");