1 // SPDX-License-Identifier: GPL-2.0-only 2 /* DVB frontend part of the Linux driver for TwinhanDTV Alpha/MagicBoxII USB2.0 3 * DVB-T receiver. 4 * 5 * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@posteo.de) 6 * 7 * Thanks to Twinhan who kindly provided hardware and information. 8 * 9 * see Documentation/driver-api/media/drivers/dvb-usb.rst for more information 10 */ 11 #include "vp7045.h" 12 13 /* It is a Zarlink MT352 within a Samsung Tuner (DNOS404ZH102A) - 040929 - AAT 14 * 15 * Programming is hidden inside the firmware, so set_frontend is very easy. 16 * Even though there is a Firmware command that one can use to access the demod 17 * via its registers. This is used for status information. 18 */ 19 20 struct vp7045_fe_state { 21 struct dvb_frontend fe; 22 struct dvb_usb_device *d; 23 }; 24 25 static int vp7045_fe_read_status(struct dvb_frontend *fe, 26 enum fe_status *status) 27 { 28 struct vp7045_fe_state *state = fe->demodulator_priv; 29 u8 s0 = vp7045_read_reg(state->d,0x00), 30 s1 = vp7045_read_reg(state->d,0x01), 31 s3 = vp7045_read_reg(state->d,0x03); 32 33 *status = 0; 34 if (s0 & (1 << 4)) 35 *status |= FE_HAS_CARRIER; 36 if (s0 & (1 << 1)) 37 *status |= FE_HAS_VITERBI; 38 if (s0 & (1 << 5)) 39 *status |= FE_HAS_LOCK; 40 if (s1 & (1 << 1)) 41 *status |= FE_HAS_SYNC; 42 if (s3 & (1 << 6)) 43 *status |= FE_HAS_SIGNAL; 44 45 if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) != 46 (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) 47 *status &= ~FE_HAS_LOCK; 48 49 return 0; 50 } 51 52 static int vp7045_fe_read_ber(struct dvb_frontend* fe, u32 *ber) 53 { 54 struct vp7045_fe_state *state = fe->demodulator_priv; 55 *ber = (vp7045_read_reg(state->d, 0x0D) << 16) | 56 (vp7045_read_reg(state->d, 0x0E) << 8) | 57 vp7045_read_reg(state->d, 0x0F); 58 return 0; 59 } 60 61 static int vp7045_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc) 62 { 63 struct vp7045_fe_state *state = fe->demodulator_priv; 64 *unc = (vp7045_read_reg(state->d, 0x10) << 8) | 65 vp7045_read_reg(state->d, 0x11); 66 return 0; 67 } 68 69 static int vp7045_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength) 70 { 71 struct vp7045_fe_state *state = fe->demodulator_priv; 72 u16 signal = (vp7045_read_reg(state->d, 0x14) << 8) | 73 vp7045_read_reg(state->d, 0x15); 74 75 *strength = ~signal; 76 return 0; 77 } 78 79 static int vp7045_fe_read_snr(struct dvb_frontend* fe, u16 *snr) 80 { 81 struct vp7045_fe_state *state = fe->demodulator_priv; 82 u8 _snr = vp7045_read_reg(state->d, 0x09); 83 *snr = (_snr << 8) | _snr; 84 return 0; 85 } 86 87 static int vp7045_fe_init(struct dvb_frontend* fe) 88 { 89 return 0; 90 } 91 92 static int vp7045_fe_sleep(struct dvb_frontend* fe) 93 { 94 return 0; 95 } 96 97 static int vp7045_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune) 98 { 99 tune->min_delay_ms = 800; 100 return 0; 101 } 102 103 static int vp7045_fe_set_frontend(struct dvb_frontend *fe) 104 { 105 struct dtv_frontend_properties *fep = &fe->dtv_property_cache; 106 struct vp7045_fe_state *state = fe->demodulator_priv; 107 u8 buf[5]; 108 u32 freq = fep->frequency / 1000; 109 110 buf[0] = (freq >> 16) & 0xff; 111 buf[1] = (freq >> 8) & 0xff; 112 buf[2] = freq & 0xff; 113 buf[3] = 0; 114 115 switch (fep->bandwidth_hz) { 116 case 8000000: 117 buf[4] = 8; 118 break; 119 case 7000000: 120 buf[4] = 7; 121 break; 122 case 6000000: 123 buf[4] = 6; 124 break; 125 default: 126 return -EINVAL; 127 } 128 129 vp7045_usb_op(state->d,LOCK_TUNER_COMMAND,buf,5,NULL,0,200); 130 return 0; 131 } 132 133 static void vp7045_fe_release(struct dvb_frontend* fe) 134 { 135 struct vp7045_fe_state *state = fe->demodulator_priv; 136 kfree(state); 137 } 138 139 static const struct dvb_frontend_ops vp7045_fe_ops; 140 141 struct dvb_frontend * vp7045_fe_attach(struct dvb_usb_device *d) 142 { 143 struct vp7045_fe_state *s = kzalloc(sizeof(struct vp7045_fe_state), GFP_KERNEL); 144 if (s == NULL) 145 goto error; 146 147 s->d = d; 148 memcpy(&s->fe.ops, &vp7045_fe_ops, sizeof(struct dvb_frontend_ops)); 149 s->fe.demodulator_priv = s; 150 151 return &s->fe; 152 error: 153 return NULL; 154 } 155 156 157 static const struct dvb_frontend_ops vp7045_fe_ops = { 158 .delsys = { SYS_DVBT }, 159 .info = { 160 .name = "Twinhan VP7045/46 USB DVB-T", 161 .frequency_min_hz = 44250 * kHz, 162 .frequency_max_hz = 867250 * kHz, 163 .frequency_stepsize_hz = 1 * kHz, 164 .caps = FE_CAN_INVERSION_AUTO | 165 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | 166 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | 167 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO | 168 FE_CAN_TRANSMISSION_MODE_AUTO | 169 FE_CAN_GUARD_INTERVAL_AUTO | 170 FE_CAN_RECOVER | 171 FE_CAN_HIERARCHY_AUTO, 172 }, 173 174 .release = vp7045_fe_release, 175 176 .init = vp7045_fe_init, 177 .sleep = vp7045_fe_sleep, 178 179 .set_frontend = vp7045_fe_set_frontend, 180 .get_tune_settings = vp7045_fe_get_tune_settings, 181 182 .read_status = vp7045_fe_read_status, 183 .read_ber = vp7045_fe_read_ber, 184 .read_signal_strength = vp7045_fe_read_signal_strength, 185 .read_snr = vp7045_fe_read_snr, 186 .read_ucblocks = vp7045_fe_read_unc_blocks, 187 }; 188