drivers/media/dvb/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_frontend_ops ops;
  27
  28         struct dvb_usb_device *d;
  29 };
  30
  31 static int vp7045_fe_read_status(struct dvb_frontend* fe, fe_status_t *status)
  32 {
  33         struct vp7045_fe_state *state = fe->demodulator_priv;
  34         u8 s0 = vp7045_read_reg(state->d,0x00),
  35            s1 = vp7045_read_reg(state->d,0x01),
  36            s3 = vp7045_read_reg(state->d,0x03);
  37
  38         *status = 0;
  39         if (s0 & (1 << 4))
  40                 *status |= FE_HAS_CARRIER;
  41         if (s0 & (1 << 1))
  42                 *status |= FE_HAS_VITERBI;
  43         if (s0 & (1 << 5))
  44                 *status |= FE_HAS_LOCK;
  45         if (s1 & (1 << 1))
  46                 *status |= FE_HAS_SYNC;
  47         if (s3 & (1 << 6))
  48                 *status |= FE_HAS_SIGNAL;
  49
  50         if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
  51                         (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
  52                 *status &= ~FE_HAS_LOCK;
  53
  54         return 0;
  55 }
  56
  57 static int vp7045_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
  58 {
  59         struct vp7045_fe_state *state = fe->demodulator_priv;
  60         *ber = (vp7045_read_reg(state->d, 0x0D) << 16) |
  61                (vp7045_read_reg(state->d, 0x0E) << 8) |
  62                 vp7045_read_reg(state->d, 0x0F);
  63         return 0;
  64 }
  65
  66 static int vp7045_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
  67 {
  68         struct vp7045_fe_state *state = fe->demodulator_priv;
  69         *unc = (vp7045_read_reg(state->d, 0x10) << 8) |
  70                     vp7045_read_reg(state->d, 0x11);
  71         return 0;
  72 }
  73
  74 static int vp7045_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
  75 {
  76         struct vp7045_fe_state *state = fe->demodulator_priv;
  77         u16 signal = (vp7045_read_reg(state->d, 0x14) << 8) |
  78                 vp7045_read_reg(state->d, 0x15);
  79
  80         *strength = ~signal;
  81         return 0;
  82 }
  83
  84 static int vp7045_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
  85 {
  86         struct vp7045_fe_state *state = fe->demodulator_priv;
  87         u8 _snr = vp7045_read_reg(state->d, 0x09);
  88         *snr = (_snr << 8) | _snr;
  89         return 0;
  90 }
  91
  92 static int vp7045_fe_init(struct dvb_frontend* fe)
  93 {
  94         return 0;
  95 }
  96
  97 static int vp7045_fe_sleep(struct dvb_frontend* fe)
  98 {
  99         return 0;
 100 }
 101
 102 static int vp7045_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
 103 {
 104         tune->min_delay_ms = 800;
 105         return 0;
 106 }
 107
 108 static int vp7045_fe_set_frontend(struct dvb_frontend* fe,
 109                                   struct dvb_frontend_parameters *fep)
 110 {
 111         struct vp7045_fe_state *state = fe->demodulator_priv;
 112         u8 buf[5];
 113         u32 freq = fep->frequency / 1000;
 114
 115         buf[0] = (freq >> 16) & 0xff;
 116         buf[1] = (freq >>  8) & 0xff;
 117         buf[2] =  freq        & 0xff;
 118         buf[3] = 0;
 119
 120         switch (fep->u.ofdm.bandwidth) {
 121                 case BANDWIDTH_8_MHZ: buf[4] = 8; break;
 122                 case BANDWIDTH_7_MHZ: buf[4] = 7; break;
 123                 case BANDWIDTH_6_MHZ: buf[4] = 6; break;
 124                 case BANDWIDTH_AUTO: return -EOPNOTSUPP;
 125                 default:
 126                         return -EINVAL;
 127         }
 128
 129         vp7045_usb_op(state->d,LOCK_TUNER_COMMAND,buf,5,NULL,0,200);
 130         return 0;
 131 }
 132
 133 static int vp7045_fe_get_frontend(struct dvb_frontend* fe,
 134                                   struct dvb_frontend_parameters *fep)
 135 {
 136         return 0;
 137 }
 138
 139 static void vp7045_fe_release(struct dvb_frontend* fe)
 140 {
 141         struct vp7045_fe_state *state = fe->demodulator_priv;
 142         kfree(state);
 143 }
 144
 145 static struct dvb_frontend_ops vp7045_fe_ops;
 146
 147 struct dvb_frontend * vp7045_fe_attach(struct dvb_usb_device *d)
 148 {
 149         struct vp7045_fe_state *s = kzalloc(sizeof(struct vp7045_fe_state), GFP_KERNEL);
 150         if (s == NULL)
 151                 goto error;
 152
 153         s->d = d;
 154         memcpy(&s->ops, &vp7045_fe_ops, sizeof(struct dvb_frontend_ops));
 155         s->fe.ops = &s->ops;
 156         s->fe.demodulator_priv = s;
 157
 158         goto success;
 159 error:
 160         return NULL;
 161 success:
 162         return &s->fe;
 163 }
 164
 165
 166 static struct dvb_frontend_ops vp7045_fe_ops = {
 167         .info = {
 168                 .name                   = "Twinhan VP7045/46 USB DVB-T",
 169                 .type                   = FE_OFDM,
 170                 .frequency_min          = 44250000,
 171                 .frequency_max          = 867250000,
 172                 .frequency_stepsize     = 1000,
 173                 .caps = FE_CAN_INVERSION_AUTO |
 174                                 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 175                                 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 176                                 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 177                                 FE_CAN_TRANSMISSION_MODE_AUTO |
 178                                 FE_CAN_GUARD_INTERVAL_AUTO |
 179                                 FE_CAN_RECOVER |
 180                                 FE_CAN_HIERARCHY_AUTO,
 181         },
 182
 183         .release = vp7045_fe_release,
 184
 185         .init = vp7045_fe_init,
 186         .sleep = vp7045_fe_sleep,
 187
 188         .set_frontend = vp7045_fe_set_frontend,
 189         .get_frontend = vp7045_fe_get_frontend,
 190         .get_tune_settings = vp7045_fe_get_tune_settings,
 191
 192         .read_status = vp7045_fe_read_status,
 193         .read_ber = vp7045_fe_read_ber,
 194         .read_signal_strength = vp7045_fe_read_signal_strength,
 195         .read_snr = vp7045_fe_read_snr,
 196         .read_ucblocks = vp7045_fe_read_unc_blocks,
 197 };