drivers/media/usb/dvb-usb/dtt200u-fe.c

   1 /* Frontend part of the Linux driver for the WideView/ Yakumo/ Hama/
   2  * Typhoon/ Yuan DVB-T USB2.0 receiver.
   3  *
   4  * Copyright (C) 2005 Patrick Boettcher <patrick.boettcher@desy.de>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the Free
   8  *      Software Foundation, version 2.
   9  *
  10  * see Documentation/dvb/README.dvb-usb for more information
  11  */
  12 #include "dtt200u.h"
  13
  14 struct dtt200u_fe_state {
  15         struct dvb_usb_device *d;
  16
  17         fe_status_t stat;
  18
  19         struct dtv_frontend_properties fep;
  20         struct dvb_frontend frontend;
  21 };
  22
  23 static int dtt200u_fe_read_status(struct dvb_frontend* fe, fe_status_t *stat)
  24 {
  25         struct dtt200u_fe_state *state = fe->demodulator_priv;
  26         u8 st = GET_TUNE_STATUS, b[3];
  27
  28         dvb_usb_generic_rw(state->d,&st,1,b,3,0);
  29
  30         switch (b[0]) {
  31                 case 0x01:
  32                         *stat = FE_HAS_SIGNAL | FE_HAS_CARRIER |
  33                                 FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
  34                         break;
  35                 case 0x00: /* pending */
  36                         *stat = FE_TIMEDOUT; /* during set_frontend */
  37                         break;
  38                 default:
  39                 case 0x02: /* failed */
  40                         *stat = 0;
  41                         break;
  42         }
  43         return 0;
  44 }
  45
  46 static int dtt200u_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
  47 {
  48         struct dtt200u_fe_state *state = fe->demodulator_priv;
  49         u8 bw = GET_VIT_ERR_CNT,b[3];
  50         dvb_usb_generic_rw(state->d,&bw,1,b,3,0);
  51         *ber = (b[0] << 16) | (b[1] << 8) | b[2];
  52         return 0;
  53 }
  54
  55 static int dtt200u_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
  56 {
  57         struct dtt200u_fe_state *state = fe->demodulator_priv;
  58         u8 bw = GET_RS_UNCOR_BLK_CNT,b[2];
  59
  60         dvb_usb_generic_rw(state->d,&bw,1,b,2,0);
  61         *unc = (b[0] << 8) | b[1];
  62         return 0;
  63 }
  64
  65 static int dtt200u_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
  66 {
  67         struct dtt200u_fe_state *state = fe->demodulator_priv;
  68         u8 bw = GET_AGC, b;
  69         dvb_usb_generic_rw(state->d,&bw,1,&b,1,0);
  70         *strength = (b << 8) | b;
  71         return 0;
  72 }
  73
  74 static int dtt200u_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
  75 {
  76         struct dtt200u_fe_state *state = fe->demodulator_priv;
  77         u8 bw = GET_SNR,br;
  78         dvb_usb_generic_rw(state->d,&bw,1,&br,1,0);
  79         *snr = ~((br << 8) | br);
  80         return 0;
  81 }
  82
  83 static int dtt200u_fe_init(struct dvb_frontend* fe)
  84 {
  85         struct dtt200u_fe_state *state = fe->demodulator_priv;
  86         u8 b = SET_INIT;
  87         return dvb_usb_generic_write(state->d,&b,1);
  88 }
  89
  90 static int dtt200u_fe_sleep(struct dvb_frontend* fe)
  91 {
  92         return dtt200u_fe_init(fe);
  93 }
  94
  95 static int dtt200u_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
  96 {
  97         tune->min_delay_ms = 1500;
  98         tune->step_size = 0;
  99         tune->max_drift = 0;
 100         return 0;
 101 }
 102
 103 static int dtt200u_fe_set_frontend(struct dvb_frontend *fe)
 104 {
 105         struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
 106         struct dtt200u_fe_state *state = fe->demodulator_priv;
 107         int i;
 108         fe_status_t st;
 109         u16 freq = fep->frequency / 250000;
 110         u8 bwbuf[2] = { SET_BANDWIDTH, 0 },freqbuf[3] = { SET_RF_FREQ, 0, 0 };
 111
 112         switch (fep->bandwidth_hz) {
 113         case 8000000:
 114                 bwbuf[1] = 8;
 115                 break;
 116         case 7000000:
 117                 bwbuf[1] = 7;
 118                 break;
 119         case 6000000:
 120                 bwbuf[1] = 6;
 121                 break;
 122         default:
 123                 return -EINVAL;
 124         }
 125
 126         dvb_usb_generic_write(state->d,bwbuf,2);
 127
 128         freqbuf[1] = freq & 0xff;
 129         freqbuf[2] = (freq >> 8) & 0xff;
 130         dvb_usb_generic_write(state->d,freqbuf,3);
 131
 132         for (i = 0; i < 30; i++) {
 133                 msleep(20);
 134                 dtt200u_fe_read_status(fe, &st);
 135                 if (st & FE_TIMEDOUT)
 136                         continue;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int dtt200u_fe_get_frontend(struct dvb_frontend* fe)
 143 {
 144         struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
 145         struct dtt200u_fe_state *state = fe->demodulator_priv;
 146         memcpy(fep, &state->fep, sizeof(struct dtv_frontend_properties));
 147         return 0;
 148 }
 149
 150 static void dtt200u_fe_release(struct dvb_frontend* fe)
 151 {
 152         struct dtt200u_fe_state *state = (struct dtt200u_fe_state*) fe->demodulator_priv;
 153         kfree(state);
 154 }
 155
 156 static struct dvb_frontend_ops dtt200u_fe_ops;
 157
 158 struct dvb_frontend* dtt200u_fe_attach(struct dvb_usb_device *d)
 159 {
 160         struct dtt200u_fe_state* state = NULL;
 161
 162         /* allocate memory for the internal state */
 163         state = kzalloc(sizeof(struct dtt200u_fe_state), GFP_KERNEL);
 164         if (state == NULL)
 165                 goto error;
 166
 167         deb_info("attaching frontend dtt200u\n");
 168
 169         state->d = d;
 170
 171         memcpy(&state->frontend.ops,&dtt200u_fe_ops,sizeof(struct dvb_frontend_ops));
 172         state->frontend.demodulator_priv = state;
 173
 174         return &state->frontend;
 175 error:
 176         return NULL;
 177 }
 178
 179 static struct dvb_frontend_ops dtt200u_fe_ops = {
 180         .delsys = { SYS_DVBT },
 181         .info = {
 182                 .name                   = "WideView USB DVB-T",
 183                 .frequency_min          = 44250000,
 184                 .frequency_max          = 867250000,
 185                 .frequency_stepsize     = 250000,
 186                 .caps = FE_CAN_INVERSION_AUTO |
 187                                 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 188                                 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 189                                 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 190                                 FE_CAN_TRANSMISSION_MODE_AUTO |
 191                                 FE_CAN_GUARD_INTERVAL_AUTO |
 192                                 FE_CAN_RECOVER |
 193                                 FE_CAN_HIERARCHY_AUTO,
 194         },
 195
 196         .release = dtt200u_fe_release,
 197
 198         .init = dtt200u_fe_init,
 199         .sleep = dtt200u_fe_sleep,
 200
 201         .set_frontend = dtt200u_fe_set_frontend,
 202         .get_frontend = dtt200u_fe_get_frontend,
 203         .get_tune_settings = dtt200u_fe_get_tune_settings,
 204
 205         .read_status = dtt200u_fe_read_status,
 206         .read_ber = dtt200u_fe_read_ber,
 207         .read_signal_strength = dtt200u_fe_read_signal_strength,
 208         .read_snr = dtt200u_fe_read_snr,
 209         .read_ucblocks = dtt200u_fe_read_unc_blocks,
 210 };