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 }; 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