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 14struct dtt200u_fe_state { 15 struct dvb_usb_device *d; 16 17 fe_status_t stat; 18 19 struct dvb_frontend_parameters fep; 20 struct dvb_frontend frontend; 21}; 22 23static 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 46static 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 55static 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 65static 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 74static 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 83static 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 90static int dtt200u_fe_sleep(struct dvb_frontend* fe) 91{ 92 return dtt200u_fe_init(fe); 93} 94 95static 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 103static int dtt200u_fe_set_frontend(struct dvb_frontend* fe, 104 struct dvb_frontend_parameters *fep) 105{ 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->u.ofdm.bandwidth) { 113 case BANDWIDTH_8_MHZ: bwbuf[1] = 8; break; 114 case BANDWIDTH_7_MHZ: bwbuf[1] = 7; break; 115 case BANDWIDTH_6_MHZ: bwbuf[1] = 6; break; 116 case BANDWIDTH_AUTO: return -EOPNOTSUPP; 117 default: 118 return -EINVAL; 119 } 120 121 dvb_usb_generic_write(state->d,bwbuf,2); 122 123 freqbuf[1] = freq & 0xff; 124 freqbuf[2] = (freq >> 8) & 0xff; 125 dvb_usb_generic_write(state->d,freqbuf,3); 126 127 for (i = 0; i < 30; i++) { 128 msleep(20); 129 dtt200u_fe_read_status(fe, &st); 130 if (st & FE_TIMEDOUT) 131 continue; 132 } 133 134 return 0; 135} 136 137static int dtt200u_fe_get_frontend(struct dvb_frontend* fe, 138 struct dvb_frontend_parameters *fep) 139{ 140 struct dtt200u_fe_state *state = fe->demodulator_priv; 141 memcpy(fep,&state->fep,sizeof(struct dvb_frontend_parameters)); 142 return 0; 143} 144 145static void dtt200u_fe_release(struct dvb_frontend* fe) 146{ 147 struct dtt200u_fe_state *state = (struct dtt200u_fe_state*) fe->demodulator_priv; 148 kfree(state); 149} 150 151static struct dvb_frontend_ops dtt200u_fe_ops; 152 153struct dvb_frontend* dtt200u_fe_attach(struct dvb_usb_device *d) 154{ 155 struct dtt200u_fe_state* state = NULL; 156 157 /* allocate memory for the internal state */ 158 state = kzalloc(sizeof(struct dtt200u_fe_state), GFP_KERNEL); 159 if (state == NULL) 160 goto error; 161 162 deb_info("attaching frontend dtt200u\n"); 163 164 state->d = d; 165 166 memcpy(&state->frontend.ops,&dtt200u_fe_ops,sizeof(struct dvb_frontend_ops)); 167 state->frontend.demodulator_priv = state; 168 169 return &state->frontend; 170error: 171 return NULL; 172} 173 174static struct dvb_frontend_ops dtt200u_fe_ops = { 175 .info = { 176 .name = "WideView USB DVB-T", 177 .type = FE_OFDM, 178 .frequency_min = 44250000, 179 .frequency_max = 867250000, 180 .frequency_stepsize = 250000, 181 .caps = FE_CAN_INVERSION_AUTO | 182 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | 183 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | 184 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO | 185 FE_CAN_TRANSMISSION_MODE_AUTO | 186 FE_CAN_GUARD_INTERVAL_AUTO | 187 FE_CAN_RECOVER | 188 FE_CAN_HIERARCHY_AUTO, 189 }, 190 191 .release = dtt200u_fe_release, 192 193 .init = dtt200u_fe_init, 194 .sleep = dtt200u_fe_sleep, 195 196 .set_frontend = dtt200u_fe_set_frontend, 197 .get_frontend = dtt200u_fe_get_frontend, 198 .get_tune_settings = dtt200u_fe_get_tune_settings, 199 200 .read_status = dtt200u_fe_read_status, 201 .read_ber = dtt200u_fe_read_ber, 202 .read_signal_strength = dtt200u_fe_read_signal_strength, 203 .read_snr = dtt200u_fe_read_snr, 204 .read_ucblocks = dtt200u_fe_read_unc_blocks, 205}; 206