kernel/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, fe_status_t *status)
  30 {
  31         struct vp7045_fe_state *state = fe->demodulator_priv;
  32         u8 s0 = vp7045_read_reg(state->d,0x00),
  33            s1 = vp7045_read_reg(state->d,0x01),
  34            s3 = vp7045_read_reg(state->d,0x03);
  35
  36         *status = 0;
  37         if (s0 & (1 << 4))
  38                 *status |= FE_HAS_CARRIER;
  39         if (s0 & (1 << 1))
  40                 *status |= FE_HAS_VITERBI;
  41         if (s0 & (1 << 5))
  42                 *status |= FE_HAS_LOCK;
  43         if (s1 & (1 << 1))
  44                 *status |= FE_HAS_SYNC;
  45         if (s3 & (1 << 6))
  46                 *status |= FE_HAS_SIGNAL;
  47
  48         if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
  49                         (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
  50                 *status &= ~FE_HAS_LOCK;
  51
  52         return 0;
  53 }
  54
  55 static int vp7045_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
  56 {
  57         struct vp7045_fe_state *state = fe->demodulator_priv;
  58         *ber = (vp7045_read_reg(state->d, 0x0D) << 16) |
  59                (vp7045_read_reg(state->d, 0x0E) << 8) |
  60                 vp7045_read_reg(state->d, 0x0F);
  61         return 0;
  62 }
  63
  64 static int vp7045_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
  65 {
  66         struct vp7045_fe_state *state = fe->demodulator_priv;
  67         *unc = (vp7045_read_reg(state->d, 0x10) << 8) |
  68                     vp7045_read_reg(state->d, 0x11);
  69         return 0;
  70 }
  71
  72 static int vp7045_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
  73 {
  74         struct vp7045_fe_state *state = fe->demodulator_priv;
  75         u16 signal = (vp7045_read_reg(state->d, 0x14) << 8) |
  76                 vp7045_read_reg(state->d, 0x15);
  77
  78         *strength = ~signal;
  79         return 0;
  80 }
  81
  82 static int vp7045_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
  83 {
  84         struct vp7045_fe_state *state = fe->demodulator_priv;
  85         u8 _snr = vp7045_read_reg(state->d, 0x09);
  86         *snr = (_snr << 8) | _snr;
  87         return 0;
  88 }
  89
  90 static int vp7045_fe_init(struct dvb_frontend* fe)
  91 {
  92         return 0;
  93 }
  94
  95 static int vp7045_fe_sleep(struct dvb_frontend* fe)
  96 {
  97         return 0;
  98 }
  99
 100 static int vp7045_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
 101 {
 102         tune->min_delay_ms = 800;
 103         return 0;
 104 }
 105
 106 static int vp7045_fe_set_frontend(struct dvb_frontend *fe)
 107 {
 108         struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
 109         struct vp7045_fe_state *state = fe->demodulator_priv;
 110         u8 buf[5];
 111         u32 freq = fep->frequency / 1000;
 112
 113         buf[0] = (freq >> 16) & 0xff;
 114         buf[1] = (freq >>  8) & 0xff;
 115         buf[2] =  freq        & 0xff;
 116         buf[3] = 0;
 117
 118         switch (fep->bandwidth_hz) {
 119         case 8000000:
 120                 buf[4] = 8;
 121                 break;
 122         case 7000000:
 123                 buf[4] = 7;
 124                 break;
 125         case 6000000:
 126                 buf[4] = 6;
 127                 break;
 128         default:
 129                 return -EINVAL;
 130         }
 131
 132         vp7045_usb_op(state->d,LOCK_TUNER_COMMAND,buf,5,NULL,0,200);
 133         return 0;
 134 }
 135
 136 static void vp7045_fe_release(struct dvb_frontend* fe)
 137 {
 138         struct vp7045_fe_state *state = fe->demodulator_priv;
 139         kfree(state);
 140 }
 141
 142 static struct dvb_frontend_ops vp7045_fe_ops;
 143
 144 struct dvb_frontend * vp7045_fe_attach(struct dvb_usb_device *d)
 145 {
 146         struct vp7045_fe_state *s = kzalloc(sizeof(struct vp7045_fe_state), GFP_KERNEL);
 147         if (s == NULL)
 148                 goto error;
 149
 150         s->d = d;
 151         memcpy(&s->fe.ops, &vp7045_fe_ops, sizeof(struct dvb_frontend_ops));
 152         s->fe.demodulator_priv = s;
 153
 154         return &s->fe;
 155 error:
 156         return NULL;
 157 }
 158
 159
 160 static struct dvb_frontend_ops vp7045_fe_ops = {
 161         .delsys = { SYS_DVBT },
 162         .info = {
 163                 .name                   = "Twinhan VP7045/46 USB DVB-T",
 164                 .frequency_min          = 44250000,
 165                 .frequency_max          = 867250000,
 166                 .frequency_stepsize     = 1000,
 167                 .caps = FE_CAN_INVERSION_AUTO |
 168                                 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 169                                 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 170                                 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 171                                 FE_CAN_TRANSMISSION_MODE_AUTO |
 172                                 FE_CAN_GUARD_INTERVAL_AUTO |
 173                                 FE_CAN_RECOVER |
 174                                 FE_CAN_HIERARCHY_AUTO,
 175         },
 176
 177         .release = vp7045_fe_release,
 178
 179         .init = vp7045_fe_init,
 180         .sleep = vp7045_fe_sleep,
 181
 182         .set_frontend = vp7045_fe_set_frontend,
 183         .get_tune_settings = vp7045_fe_get_tune_settings,
 184
 185         .read_status = vp7045_fe_read_status,
 186         .read_ber = vp7045_fe_read_ber,
 187         .read_signal_strength = vp7045_fe_read_signal_strength,
 188         .read_snr = vp7045_fe_read_snr,
 189         .read_ucblocks = vp7045_fe_read_unc_blocks,
 190 };