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@posteo.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 enum fe_status 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, 24 enum fe_status *stat) 25 { 26 struct dtt200u_fe_state *state = fe->demodulator_priv; 27 u8 st = GET_TUNE_STATUS, b[3]; 28 29 dvb_usb_generic_rw(state->d,&st,1,b,3,0); 30 31 switch (b[0]) { 32 case 0x01: 33 *stat = FE_HAS_SIGNAL | FE_HAS_CARRIER | 34 FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK; 35 break; 36 case 0x00: /* pending */ 37 *stat = FE_TIMEDOUT; /* during set_frontend */ 38 break; 39 default: 40 case 0x02: /* failed */ 41 *stat = 0; 42 break; 43 } 44 return 0; 45 } 46 47 static int dtt200u_fe_read_ber(struct dvb_frontend* fe, u32 *ber) 48 { 49 struct dtt200u_fe_state *state = fe->demodulator_priv; 50 u8 bw = GET_VIT_ERR_CNT,b[3]; 51 dvb_usb_generic_rw(state->d,&bw,1,b,3,0); 52 *ber = (b[0] << 16) | (b[1] << 8) | b[2]; 53 return 0; 54 } 55 56 static int dtt200u_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc) 57 { 58 struct dtt200u_fe_state *state = fe->demodulator_priv; 59 u8 bw = GET_RS_UNCOR_BLK_CNT,b[2]; 60 61 dvb_usb_generic_rw(state->d,&bw,1,b,2,0); 62 *unc = (b[0] << 8) | b[1]; 63 return 0; 64 } 65 66 static int dtt200u_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength) 67 { 68 struct dtt200u_fe_state *state = fe->demodulator_priv; 69 u8 bw = GET_AGC, b; 70 dvb_usb_generic_rw(state->d,&bw,1,&b,1,0); 71 *strength = (b << 8) | b; 72 return 0; 73 } 74 75 static int dtt200u_fe_read_snr(struct dvb_frontend* fe, u16 *snr) 76 { 77 struct dtt200u_fe_state *state = fe->demodulator_priv; 78 u8 bw = GET_SNR,br; 79 dvb_usb_generic_rw(state->d,&bw,1,&br,1,0); 80 *snr = ~((br << 8) | br); 81 return 0; 82 } 83 84 static int dtt200u_fe_init(struct dvb_frontend* fe) 85 { 86 struct dtt200u_fe_state *state = fe->demodulator_priv; 87 u8 b = SET_INIT; 88 return dvb_usb_generic_write(state->d,&b,1); 89 } 90 91 static int dtt200u_fe_sleep(struct dvb_frontend* fe) 92 { 93 return dtt200u_fe_init(fe); 94 } 95 96 static int dtt200u_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune) 97 { 98 tune->min_delay_ms = 1500; 99 tune->step_size = 0; 100 tune->max_drift = 0; 101 return 0; 102 } 103 104 static int dtt200u_fe_set_frontend(struct dvb_frontend *fe) 105 { 106 struct dtv_frontend_properties *fep = &fe->dtv_property_cache; 107 struct dtt200u_fe_state *state = fe->demodulator_priv; 108 int i; 109 enum fe_status st; 110 u16 freq = fep->frequency / 250000; 111 u8 bwbuf[2] = { SET_BANDWIDTH, 0 },freqbuf[3] = { SET_RF_FREQ, 0, 0 }; 112 113 switch (fep->bandwidth_hz) { 114 case 8000000: 115 bwbuf[1] = 8; 116 break; 117 case 7000000: 118 bwbuf[1] = 7; 119 break; 120 case 6000000: 121 bwbuf[1] = 6; 122 break; 123 default: 124 return -EINVAL; 125 } 126 127 dvb_usb_generic_write(state->d,bwbuf,2); 128 129 freqbuf[1] = freq & 0xff; 130 freqbuf[2] = (freq >> 8) & 0xff; 131 dvb_usb_generic_write(state->d,freqbuf,3); 132 133 for (i = 0; i < 30; i++) { 134 msleep(20); 135 dtt200u_fe_read_status(fe, &st); 136 if (st & FE_TIMEDOUT) 137 continue; 138 } 139 140 return 0; 141 } 142 143 static int dtt200u_fe_get_frontend(struct dvb_frontend* fe, 144 struct dtv_frontend_properties *fep) 145 { 146 struct dtt200u_fe_state *state = fe->demodulator_priv; 147 148 memcpy(fep, &state->fep, sizeof(struct dtv_frontend_properties)); 149 return 0; 150 } 151 152 static void dtt200u_fe_release(struct dvb_frontend* fe) 153 { 154 struct dtt200u_fe_state *state = (struct dtt200u_fe_state*) fe->demodulator_priv; 155 kfree(state); 156 } 157 158 static struct dvb_frontend_ops dtt200u_fe_ops; 159 160 struct dvb_frontend* dtt200u_fe_attach(struct dvb_usb_device *d) 161 { 162 struct dtt200u_fe_state* state = NULL; 163 164 /* allocate memory for the internal state */ 165 state = kzalloc(sizeof(struct dtt200u_fe_state), GFP_KERNEL); 166 if (state == NULL) 167 goto error; 168 169 deb_info("attaching frontend dtt200u\n"); 170 171 state->d = d; 172 173 memcpy(&state->frontend.ops,&dtt200u_fe_ops,sizeof(struct dvb_frontend_ops)); 174 state->frontend.demodulator_priv = state; 175 176 return &state->frontend; 177 error: 178 return NULL; 179 } 180 181 static struct dvb_frontend_ops dtt200u_fe_ops = { 182 .delsys = { SYS_DVBT }, 183 .info = { 184 .name = "WideView USB DVB-T", 185 .frequency_min = 44250000, 186 .frequency_max = 867250000, 187 .frequency_stepsize = 250000, 188 .caps = FE_CAN_INVERSION_AUTO | 189 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | 190 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | 191 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO | 192 FE_CAN_TRANSMISSION_MODE_AUTO | 193 FE_CAN_GUARD_INTERVAL_AUTO | 194 FE_CAN_RECOVER | 195 FE_CAN_HIERARCHY_AUTO, 196 }, 197 198 .release = dtt200u_fe_release, 199 200 .init = dtt200u_fe_init, 201 .sleep = dtt200u_fe_sleep, 202 203 .set_frontend = dtt200u_fe_set_frontend, 204 .get_frontend = dtt200u_fe_get_frontend, 205 .get_tune_settings = dtt200u_fe_get_tune_settings, 206 207 .read_status = dtt200u_fe_read_status, 208 .read_ber = dtt200u_fe_read_ber, 209 .read_signal_strength = dtt200u_fe_read_signal_strength, 210 .read_snr = dtt200u_fe_read_snr, 211 .read_ucblocks = dtt200u_fe_read_unc_blocks, 212 }; 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