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/slab.h>
  12 #include <linux/delay.h>
  13 #include <linux/videodev2.h>
  14 #include <media/tuner.h>
  15 #include "tuner-i2c.h"
  16 #include "tea5761.h"
  17
  18 static int debug;
  19 module_param(debug, int, 0644);
  20 MODULE_PARM_DESC(debug, "enable verbose debug messages");
  21
  22 struct tea5761_priv {
  23         struct tuner_i2c_props i2c_props;
  24
  25         u32 frequency;
  26 };
  27
  28 /*****************************************************************************/
  29
  30 /***************************
  31  * TEA5761HN I2C registers *
  32  ***************************/
  33
  34 /* INTREG - Read: bytes 0 and 1 / Write: byte 0 */
  35
  36         /* first byte for reading */
  37 #define TEA5761_INTREG_IFFLAG           0x10
  38 #define TEA5761_INTREG_LEVFLAG          0x8
  39 #define TEA5761_INTREG_FRRFLAG          0x2
  40 #define TEA5761_INTREG_BLFLAG           0x1
  41
  42         /* second byte for reading / byte for writing */
  43 #define TEA5761_INTREG_IFMSK            0x10
  44 #define TEA5761_INTREG_LEVMSK           0x8
  45 #define TEA5761_INTREG_FRMSK            0x2
  46 #define TEA5761_INTREG_BLMSK            0x1
  47
  48 /* FRQSET - Read: bytes 2 and 3 / Write: byte 1 and 2 */
  49
  50         /* First byte */
  51 #define TEA5761_FRQSET_SEARCH_UP 0x80           /* 1=Station search from botton to up */
  52 #define TEA5761_FRQSET_SEARCH_MODE 0x40         /* 1=Search mode */
  53
  54         /* Bits 0-5 for divider MSB */
  55
  56         /* Second byte */
  57         /* Bits 0-7 for divider LSB */
  58
  59 /* TNCTRL - Read: bytes 4 and 5 / Write: Bytes 3 and 4 */
  60
  61         /* first byte */
  62
  63 #define TEA5761_TNCTRL_PUPD_0   0x40    /* Power UP/Power Down MSB */
  64 #define TEA5761_TNCTRL_BLIM     0X20    /* 1= Japan Frequencies, 0= European frequencies */
  65 #define TEA5761_TNCTRL_SWPM     0x10    /* 1= software port is FRRFLAG */
  66 #define TEA5761_TNCTRL_IFCTC    0x08    /* 1= IF count time 15.02 ms, 0= IF count time 2.02 ms */
  67 #define TEA5761_TNCTRL_AFM      0x04
  68 #define TEA5761_TNCTRL_SMUTE    0x02    /* 1= Soft mute */
  69 #define TEA5761_TNCTRL_SNC      0x01
  70
  71         /* second byte */
  72
  73 #define TEA5761_TNCTRL_MU       0x80    /* 1=Hard mute */
  74 #define TEA5761_TNCTRL_SSL_1    0x40
  75 #define TEA5761_TNCTRL_SSL_0    0x20
  76 #define TEA5761_TNCTRL_HLSI     0x10
  77 #define TEA5761_TNCTRL_MST      0x08    /* 1 = mono */
  78 #define TEA5761_TNCTRL_SWP      0x04
  79 #define TEA5761_TNCTRL_DTC      0x02    /* 1 = deemphasis 50 us, 0 = deemphasis 75 us */
  80 #define TEA5761_TNCTRL_AHLSI    0x01
  81
  82 /* FRQCHECK - Read: bytes 6 and 7  */
  83         /* First byte */
  84
  85         /* Bits 0-5 for divider MSB */
  86
  87         /* Second byte */
  88         /* Bits 0-7 for divider LSB */
  89
  90 /* TUNCHECK - Read: bytes 8 and 9  */
  91
  92         /* First byte */
  93 #define TEA5761_TUNCHECK_IF_MASK        0x7e    /* IF count */
  94 #define TEA5761_TUNCHECK_TUNTO          0x01
  95
  96         /* Second byte */
  97 #define TEA5761_TUNCHECK_LEV_MASK       0xf0    /* Level Count */
  98 #define TEA5761_TUNCHECK_LD             0x08
  99 #define TEA5761_TUNCHECK_STEREO         0x04
 100
 101 /* TESTREG - Read: bytes 10 and 11 / Write: bytes 5 and 6 */
 102
 103         /* All zero = no test mode */
 104
 105 /* MANID - Read: bytes 12 and 13 */
 106
 107         /* First byte - should be 0x10 */
 108 #define TEA5767_MANID_VERSION_MASK      0xf0    /* Version = 1 */
 109 #define TEA5767_MANID_ID_MSB_MASK       0x0f    /* Manufacurer ID - should be 0 */
 110
 111         /* Second byte - Should be 0x2b */
 112
 113 #define TEA5767_MANID_ID_LSB_MASK       0xfe    /* Manufacturer ID - should be 0x15 */
 114 #define TEA5767_MANID_IDAV              0x01    /* 1 = Chip has ID, 0 = Chip has no ID */
 115
 116 /* Chip ID - Read: bytes 14 and 15 */
 117
 118         /* First byte - should be 0x57 */
 119
 120         /* Second byte - should be 0x61 */
 121
 122 /*****************************************************************************/
 123
 124 #define FREQ_OFFSET 0 /* for TEA5767, it is 700 to give the right freq */
 125 static void tea5761_status_dump(unsigned char *buffer)
 126 {
 127         unsigned int div, frq;
 128
 129         div = ((buffer[2] & 0x3f) << 8) | buffer[3];
 130
 131         frq = 1000 * (div * 32768 / 1000 + FREQ_OFFSET + 225) / 4;      /* Freq in KHz */
 132
 133         printk(KERN_INFO "tea5761: Frequency %d.%03d KHz (divider = 0x%04x)\n",
 134                frq / 1000, frq % 1000, div);
 135 }
 136
 137 /* Freq should be specifyed at 62.5 Hz */
 138 static int set_radio_freq(struct dvb_frontend *fe,
 139                           struct analog_parameters *params)
 140 {
 141         struct tea5761_priv *priv = fe->tuner_priv;
 142         unsigned int frq = params->frequency;
 143         unsigned char buffer[7] = {0, 0, 0, 0, 0, 0, 0 };
 144         unsigned div;
 145         int rc;
 146
 147         tuner_dbg("radio freq counter %d\n", frq);
 148
 149         if (params->mode == T_STANDBY) {
 150                 tuner_dbg("TEA5761 set to standby mode\n");
 151                 buffer[5] |= TEA5761_TNCTRL_MU;
 152         } else {
 153                 buffer[4] |= TEA5761_TNCTRL_PUPD_0;
 154         }
 155
 156
 157         if (params->audmode == V4L2_TUNER_MODE_MONO) {
 158                 tuner_dbg("TEA5761 set to mono\n");
 159                 buffer[5] |= TEA5761_TNCTRL_MST;
 160         } else {
 161                 tuner_dbg("TEA5761 set to stereo\n");
 162         }
 163
 164         div = (1000 * (frq * 4 / 16 + 700 + 225) ) >> 15;
 165         buffer[1] = (div >> 8) & 0x3f;
 166         buffer[2] = div & 0xff;
 167
 168         if (debug)
 169                 tea5761_status_dump(buffer);
 170
 171         if (7 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 7)))
 172                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 173
 174         priv->frequency = frq * 125 / 2;
 175
 176         return 0;
 177 }
 178
 179 static int tea5761_read_status(struct dvb_frontend *fe, char *buffer)
 180 {
 181         struct tea5761_priv *priv = fe->tuner_priv;
 182         int rc;
 183
 184         memset(buffer, 0, 16);
 185         if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16))) {
 186                 tuner_warn("i2c i/o error: rc == %d (should be 16)\n", rc);
 187                 return -EREMOTEIO;
 188         }
 189
 190         return 0;
 191 }
 192
 193 static inline int tea5761_signal(struct dvb_frontend *fe, const char *buffer)
 194 {
 195         struct tea5761_priv *priv = fe->tuner_priv;
 196
 197         int signal = ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4));
 198
 199         tuner_dbg("Signal strength: %d\n", signal);
 200
 201         return signal;
 202 }
 203
 204 static inline int tea5761_stereo(struct dvb_frontend *fe, const char *buffer)
 205 {
 206         struct tea5761_priv *priv = fe->tuner_priv;
 207
 208         int stereo = buffer[9] & TEA5761_TUNCHECK_STEREO;
 209
 210         tuner_dbg("Radio ST GET = %02x\n", stereo);
 211
 212         return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
 213 }
 214
 215 static int tea5761_get_status(struct dvb_frontend *fe, u32 *status)
 216 {
 217         unsigned char buffer[16];
 218
 219         *status = 0;
 220
 221         if (0 == tea5761_read_status(fe, buffer)) {
 222                 if (tea5761_signal(fe, buffer))
 223                         *status = TUNER_STATUS_LOCKED;
 224                 if (tea5761_stereo(fe, buffer))
 225                         *status |= TUNER_STATUS_STEREO;
 226         }
 227
 228         return 0;
 229 }
 230
 231 static int tea5761_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 232 {
 233         unsigned char buffer[16];
 234
 235         *strength = 0;
 236
 237         if (0 == tea5761_read_status(fe, buffer))
 238                 *strength = tea5761_signal(fe, buffer);
 239
 240         return 0;
 241 }
 242
 243 int tea5761_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
 244 {
 245         unsigned char buffer[16];
 246         int rc;
 247         struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
 248
 249         if (16 != (rc = tuner_i2c_xfer_recv(&i2c, buffer, 16))) {
 250                 printk(KERN_WARNING "it is not a TEA5761. Received %i chars.\n", rc);
 251                 return -EINVAL;
 252         }
 253
 254         if ((buffer[13] != 0x2b) || (buffer[14] != 0x57) || (buffer[15] != 0x061)) {
 255                 printk(KERN_WARNING "Manufacturer ID= 0x%02x, Chip ID = %02x%02x."
 256                                     " It is not a TEA5761\n",
 257                                     buffer[13], buffer[14], buffer[15]);
 258                 return -EINVAL;
 259         }
 260         printk(KERN_WARNING "tea5761: TEA%02x%02x detected. "
 261                             "Manufacturer ID= 0x%02x\n",
 262                             buffer[14], buffer[15], buffer[13]);
 263
 264         return 0;
 265 }
 266
 267 static int tea5761_release(struct dvb_frontend *fe)
 268 {
 269         kfree(fe->tuner_priv);
 270         fe->tuner_priv = NULL;
 271
 272         return 0;
 273 }
 274
 275 static int tea5761_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 276 {
 277         struct tea5761_priv *priv = fe->tuner_priv;
 278         *frequency = priv->frequency;
 279         return 0;
 280 }
 281
 282 static struct dvb_tuner_ops tea5761_tuner_ops = {
 283         .info = {
 284                 .name           = "tea5761", // Philips TEA5761HN FM Radio
 285         },
 286         .set_analog_params = set_radio_freq,
 287         .release           = tea5761_release,
 288         .get_frequency     = tea5761_get_frequency,
 289         .get_status        = tea5761_get_status,
 290         .get_rf_strength   = tea5761_get_rf_strength,
 291 };
 292
 293 struct dvb_frontend *tea5761_attach(struct dvb_frontend *fe,
 294                                     struct i2c_adapter* i2c_adap,
 295                                     u8 i2c_addr)
 296 {
 297         struct tea5761_priv *priv = NULL;
 298
 299         if (tea5761_autodetection(i2c_adap, i2c_addr) != 0)
 300                 return NULL;
 301
 302         priv = kzalloc(sizeof(struct tea5761_priv), GFP_KERNEL);
 303         if (priv == NULL)
 304                 return NULL;
 305         fe->tuner_priv = priv;
 306
 307         priv->i2c_props.addr = i2c_addr;
 308         priv->i2c_props.adap = i2c_adap;
 309         priv->i2c_props.name = "tea5761";
 310
 311         memcpy(&fe->ops.tuner_ops, &tea5761_tuner_ops,
 312                sizeof(struct dvb_tuner_ops));
 313
 314         tuner_info("type set to %s\n", "Philips TEA5761HN FM Radio");
 315
 316         return fe;
 317 }
 318
 319
 320 EXPORT_SYMBOL_GPL(tea5761_attach);
 321 EXPORT_SYMBOL_GPL(tea5761_autodetection);
 322
 323 MODULE_DESCRIPTION("Philips TEA5761 FM tuner driver");
 324 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 325 MODULE_LICENSE("GPL");