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-driver.h"
  15
  16 #define PREFIX "TEA5761 "
  17
  18 /* from tuner-core.c */
  19 extern int tuner_debug;
  20
  21 /*****************************************************************************/
  22
  23 /***************************
  24  * TEA5761HN I2C registers *
  25  ***************************/
  26
  27 /* INTREG - Read: bytes 0 and 1 / Write: byte 0 */
  28
  29         /* first byte for reading */
  30 #define TEA5761_INTREG_IFFLAG           0x10
  31 #define TEA5761_INTREG_LEVFLAG          0x8
  32 #define TEA5761_INTREG_FRRFLAG          0x2
  33 #define TEA5761_INTREG_BLFLAG           0x1
  34
  35         /* second byte for reading / byte for writing */
  36 #define TEA5761_INTREG_IFMSK            0x10
  37 #define TEA5761_INTREG_LEVMSK           0x8
  38 #define TEA5761_INTREG_FRMSK            0x2
  39 #define TEA5761_INTREG_BLMSK            0x1
  40
  41 /* FRQSET - Read: bytes 2 and 3 / Write: byte 1 and 2 */
  42
  43         /* First byte */
  44 #define TEA5761_FRQSET_SEARCH_UP 0x80           /* 1=Station search from botton to up */
  45 #define TEA5761_FRQSET_SEARCH_MODE 0x40         /* 1=Search mode */
  46
  47         /* Bits 0-5 for divider MSB */
  48
  49         /* Second byte */
  50         /* Bits 0-7 for divider LSB */
  51
  52 /* TNCTRL - Read: bytes 4 and 5 / Write: Bytes 3 and 4 */
  53
  54         /* first byte */
  55
  56 #define TEA5761_TNCTRL_PUPD_0   0x40    /* Power UP/Power Down MSB */
  57 #define TEA5761_TNCTRL_BLIM     0X20    /* 1= Japan Frequencies, 0= European frequencies */
  58 #define TEA5761_TNCTRL_SWPM     0x10    /* 1= software port is FRRFLAG */
  59 #define TEA5761_TNCTRL_IFCTC    0x08    /* 1= IF count time 15.02 ms, 0= IF count time 2.02 ms */
  60 #define TEA5761_TNCTRL_AFM      0x04
  61 #define TEA5761_TNCTRL_SMUTE    0x02    /* 1= Soft mute */
  62 #define TEA5761_TNCTRL_SNC      0x01
  63
  64         /* second byte */
  65
  66 #define TEA5761_TNCTRL_MU       0x80    /* 1=Hard mute */
  67 #define TEA5761_TNCTRL_SSL_1    0x40
  68 #define TEA5761_TNCTRL_SSL_0    0x20
  69 #define TEA5761_TNCTRL_HLSI     0x10
  70 #define TEA5761_TNCTRL_MST      0x08    /* 1 = mono */
  71 #define TEA5761_TNCTRL_SWP      0x04
  72 #define TEA5761_TNCTRL_DTC      0x02    /* 1 = deemphasis 50 us, 0 = deemphasis 75 us */
  73 #define TEA5761_TNCTRL_AHLSI    0x01
  74
  75 /* FRQCHECK - Read: bytes 6 and 7  */
  76         /* First byte */
  77
  78         /* Bits 0-5 for divider MSB */
  79
  80         /* Second byte */
  81         /* Bits 0-7 for divider LSB */
  82
  83 /* TUNCHECK - Read: bytes 8 and 9  */
  84
  85         /* First byte */
  86 #define TEA5761_TUNCHECK_IF_MASK        0x7e    /* IF count */
  87 #define TEA5761_TUNCHECK_TUNTO          0x01
  88
  89         /* Second byte */
  90 #define TEA5761_TUNCHECK_LEV_MASK       0xf0    /* Level Count */
  91 #define TEA5761_TUNCHECK_LD             0x08
  92 #define TEA5761_TUNCHECK_STEREO         0x04
  93
  94 /* TESTREG - Read: bytes 10 and 11 / Write: bytes 5 and 6 */
  95
  96         /* All zero = no test mode */
  97
  98 /* MANID - Read: bytes 12 and 13 */
  99
 100         /* First byte - should be 0x10 */
 101 #define TEA5767_MANID_VERSION_MASK      0xf0    /* Version = 1 */
 102 #define TEA5767_MANID_ID_MSB_MASK       0x0f    /* Manufacurer ID - should be 0 */
 103
 104         /* Second byte - Should be 0x2b */
 105
 106 #define TEA5767_MANID_ID_LSB_MASK       0xfe    /* Manufacturer ID - should be 0x15 */
 107 #define TEA5767_MANID_IDAV              0x01    /* 1 = Chip has ID, 0 = Chip has no ID */
 108
 109 /* Chip ID - Read: bytes 14 and 15 */
 110
 111         /* First byte - should be 0x57 */
 112
 113         /* Second byte - should be 0x61 */
 114
 115 /*****************************************************************************/
 116
 117 static void set_tv_freq(struct i2c_client *c, unsigned int freq)
 118 {
 119         struct tuner *t = i2c_get_clientdata(c);
 120
 121         tuner_warn("This tuner doesn't support TV freq.\n");
 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(PREFIX "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 void set_radio_freq(struct i2c_client *c, unsigned int frq)
 139 {
 140         struct tuner *t = i2c_get_clientdata(c);
 141         unsigned char buffer[7] = {0, 0, 0, 0, 0, 0, 0 };
 142         unsigned div;
 143         int rc;
 144
 145         tuner_dbg (PREFIX "radio freq counter %d\n", frq);
 146
 147         if (t->mode == T_STANDBY) {
 148                 tuner_dbg("TEA5761 set to standby mode\n");
 149                 buffer[5] |= TEA5761_TNCTRL_MU;
 150         } else {
 151                 buffer[4] |= TEA5761_TNCTRL_PUPD_0;
 152         }
 153
 154
 155         if (t->audmode == V4L2_TUNER_MODE_MONO) {
 156                 tuner_dbg("TEA5761 set to mono\n");
 157                 buffer[5] |= TEA5761_TNCTRL_MST;
 158 ;
 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 (tuner_debug)
 168                 tea5761_status_dump(buffer);
 169
 170         if (7 != (rc = i2c_master_send(c, buffer, 7)))
 171                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 172 }
 173
 174 static int tea5761_signal(struct i2c_client *c)
 175 {
 176         unsigned char buffer[16];
 177         int rc;
 178         struct tuner *t = i2c_get_clientdata(c);
 179
 180         memset(buffer, 0, sizeof(buffer));
 181         if (16 != (rc = i2c_master_recv(c, buffer, 16)))
 182                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 183
 184         return ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4));
 185 }
 186
 187 static int tea5761_stereo(struct i2c_client *c)
 188 {
 189         unsigned char buffer[16];
 190         int rc;
 191         struct tuner *t = i2c_get_clientdata(c);
 192
 193         memset(buffer, 0, sizeof(buffer));
 194         if (16 != (rc = i2c_master_recv(c, buffer, 16)))
 195                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 196
 197         rc = buffer[9] & TEA5761_TUNCHECK_STEREO;
 198
 199         tuner_dbg("TEA5761 radio ST GET = %02x\n", rc);
 200
 201         return (rc ? V4L2_TUNER_SUB_STEREO : 0);
 202 }
 203
 204 int tea5761_autodetection(struct i2c_client *c)
 205 {
 206         unsigned char buffer[16];
 207         int rc;
 208         struct tuner *t = i2c_get_clientdata(c);
 209
 210         if (16 != (rc = i2c_master_recv(c, buffer, 16))) {
 211                 tuner_warn("it is not a TEA5761. Received %i chars.\n", rc);
 212                 return EINVAL;
 213         }
 214
 215         if (!((buffer[13] != 0x2b) || (buffer[14] != 0x57) || (buffer[15] != 0x061))) {
 216                 tuner_warn("Manufacturer ID= 0x%02x, Chip ID = %02x%02x. It is not a TEA5761\n",buffer[13],buffer[14],buffer[15]);
 217                 return EINVAL;
 218         }
 219         tuner_warn("TEA5761 detected.\n");
 220         return 0;
 221 }
 222
 223 static struct tuner_operations tea5761_tuner_ops = {
 224         .set_tv_freq    = set_tv_freq,
 225         .set_radio_freq = set_radio_freq,
 226         .has_signal     = tea5761_signal,
 227         .is_stereo      = tea5761_stereo,
 228 };
 229
 230 int tea5761_tuner_init(struct i2c_client *c)
 231 {
 232         struct tuner *t = i2c_get_clientdata(c);
 233
 234         if (tea5761_autodetection(c) == EINVAL)
 235                 return EINVAL;
 236
 237         tuner_info("type set to %d (%s)\n", t->type, "Philips TEA5761HN FM Radio");
 238         strlcpy(c->name, "tea5761", sizeof(c->name));
 239
 240         memcpy(&t->ops, &tea5761_tuner_ops, sizeof(struct tuner_operations));
 241
 242         return (0);
 243 }