drivers/media/usb/dvb-usb/vp7045-fe.c

   1 /* DVB frontend part of the Linux driver for TwinhanDTV Alpha/MagicBoxII USB2.0
   2  * DVB-T receiver.
   3  *
   4  * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de)
   5  *
   6  * Thanks to Twinhan who kindly provided hardware and information.
   7  *
   8  *      This program is free software; you can redistribute it and/or modify it
   9  *      under the terms of the GNU General Public License as published by the Free
  10  *      Software Foundation, version 2.
  11  *
  12  * see Documentation/dvb/README.dvb-usb for more information
  13  *
  14  */
  15 #include "vp7045.h"
  16
  17 /* It is a Zarlink MT352 within a Samsung Tuner (DNOS404ZH102A) - 040929 - AAT
  18  *
  19  * Programming is hidden inside the firmware, so set_frontend is very easy.
  20  * Even though there is a Firmware command that one can use to access the demod
  21  * via its registers. This is used for status information.
  22  */
  23
  24 struct vp7045_fe_state {
  25         struct dvb_frontend fe;
  26         struct dvb_usb_device *d;
  27 };
  28
  29 static int vp7045_fe_read_status(struct dvb_frontend *fe,
  30                                  enum fe_status *status)
  31 {
  32         struct vp7045_fe_state *state = fe->demodulator_priv;
  33         u8 s0 = vp7045_read_reg(state->d,0x00),
  34            s1 = vp7045_read_reg(state->d,0x01),
  35            s3 = vp7045_read_reg(state->d,0x03);
  36
  37         *status = 0;
  38         if (s0 & (1 << 4))
  39                 *status |= FE_HAS_CARRIER;
  40         if (s0 & (1 << 1))
  41                 *status |= FE_HAS_VITERBI;
  42         if (s0 & (1 << 5))
  43                 *status |= FE_HAS_LOCK;
  44         if (s1 & (1 << 1))
  45                 *status |= FE_HAS_SYNC;
  46         if (s3 & (1 << 6))
  47                 *status |= FE_HAS_SIGNAL;
  48
  49         if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
  50                         (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
  51                 *status &= ~FE_HAS_LOCK;
  52
  53         return 0;
  54 }
  55
  56 static int vp7045_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
  57 {
  58         struct vp7045_fe_state *state = fe->demodulator_priv;
  59         *ber = (vp7045_read_reg(state->d, 0x0D) << 16) |
  60                (vp7045_read_reg(state->d, 0x0E) << 8) |
  61                 vp7045_read_reg(state->d, 0x0F);
  62         return 0;
  63 }
  64
  65 static int vp7045_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
  66 {
  67         struct vp7045_fe_state *state = fe->demodulator_priv;
  68         *unc = (vp7045_read_reg(state->d, 0x10) << 8) |
  69                     vp7045_read_reg(state->d, 0x11);
  70         return 0;
  71 }
  72
  73 static int vp7045_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
  74 {
  75         struct vp7045_fe_state *state = fe->demodulator_priv;
  76         u16 signal = (vp7045_read_reg(state->d, 0x14) << 8) |
  77                 vp7045_read_reg(state->d, 0x15);
  78
  79         *strength = ~signal;
  80         return 0;
  81 }
  82
  83 static int vp7045_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
  84 {
  85         struct vp7045_fe_state *state = fe->demodulator_priv;
  86         u8 _snr = vp7045_read_reg(state->d, 0x09);
  87         *snr = (_snr << 8) | _snr;
  88         return 0;
  89 }
  90
  91 static int vp7045_fe_init(struct dvb_frontend* fe)
  92 {
  93         return 0;
  94 }
  95
  96 static int vp7045_fe_sleep(struct dvb_frontend* fe)
  97 {
  98         return 0;
  99 }
 100
 101 static int vp7045_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
 102 {
 103         tune->min_delay_ms = 800;
 104         return 0;
 105 }
 106
 107 static int vp7045_fe_set_frontend(struct dvb_frontend *fe)
 108 {
 109         struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
 110         struct vp7045_fe_state *state = fe->demodulator_priv;
 111         u8 buf[5];
 112         u32 freq = fep->frequency / 1000;
 113
 114         buf[0] = (freq >> 16) & 0xff;
 115         buf[1] = (freq >>  8) & 0xff;
 116         buf[2] =  freq        & 0xff;
 117         buf[3] = 0;
 118
 119         switch (fep->bandwidth_hz) {
 120         case 8000000:
 121                 buf[4] = 8;
 122                 break;
 123         case 7000000:
 124                 buf[4] = 7;
 125                 break;
 126         case 6000000:
 127                 buf[4] = 6;
 128                 break;
 129         default:
 130                 return -EINVAL;
 131         }
 132
 133         vp7045_usb_op(state->d,LOCK_TUNER_COMMAND,buf,5,NULL,0,200);
 134         return 0;
 135 }
 136
 137 static void vp7045_fe_release(struct dvb_frontend* fe)
 138 {
 139         struct vp7045_fe_state *state = fe->demodulator_priv;
 140         kfree(state);
 141 }
 142
 143 static struct dvb_frontend_ops vp7045_fe_ops;
 144
 145 struct dvb_frontend * vp7045_fe_attach(struct dvb_usb_device *d)
 146 {
 147         struct vp7045_fe_state *s = kzalloc(sizeof(struct vp7045_fe_state), GFP_KERNEL);
 148         if (s == NULL)
 149                 goto error;
 150
 151         s->d = d;
 152         memcpy(&s->fe.ops, &vp7045_fe_ops, sizeof(struct dvb_frontend_ops));
 153         s->fe.demodulator_priv = s;
 154
 155         return &s->fe;
 156 error:
 157         return NULL;
 158 }
 159
 160
 161 static struct dvb_frontend_ops vp7045_fe_ops = {
 162         .delsys = { SYS_DVBT },
 163         .info = {
 164                 .name                   = "Twinhan VP7045/46 USB DVB-T",
 165                 .frequency_min          = 44250000,
 166                 .frequency_max          = 867250000,
 167                 .frequency_stepsize     = 1000,
 168                 .caps = FE_CAN_INVERSION_AUTO |
 169                                 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 170                                 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 171                                 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 172                                 FE_CAN_TRANSMISSION_MODE_AUTO |
 173                                 FE_CAN_GUARD_INTERVAL_AUTO |
 174                                 FE_CAN_RECOVER |
 175                                 FE_CAN_HIERARCHY_AUTO,
 176         },
 177
 178         .release = vp7045_fe_release,
 179
 180         .init = vp7045_fe_init,
 181         .sleep = vp7045_fe_sleep,
 182
 183         .set_frontend = vp7045_fe_set_frontend,
 184         .get_tune_settings = vp7045_fe_get_tune_settings,
 185
 186         .read_status = vp7045_fe_read_status,
 187         .read_ber = vp7045_fe_read_ber,
 188         .read_signal_strength = vp7045_fe_read_signal_strength,
 189         .read_snr = vp7045_fe_read_snr,
 190         .read_ucblocks = vp7045_fe_read_unc_blocks,
 191 };