// SPDX-License-Identifier: GPL-2.0-only
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/* DVB frontend part of the Linux driver for TwinhanDTV Alpha/MagicBoxII USB2.0
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* DVB-T receiver.
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*
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* Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@posteo.de)
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*
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* Thanks to Twinhan who kindly provided hardware and information.
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*
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* see Documentation/driver-api/media/drivers/dvb-usb.rst for more information
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*/
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#include "vp7045.h"
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/* It is a Zarlink MT352 within a Samsung Tuner (DNOS404ZH102A) - 040929 - AAT
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*
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* Programming is hidden inside the firmware, so set_frontend is very easy.
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* Even though there is a Firmware command that one can use to access the demod
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* via its registers. This is used for status information.
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*/
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struct vp7045_fe_state {
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struct dvb_frontend fe;
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struct dvb_usb_device *d;
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};
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static int vp7045_fe_read_status(struct dvb_frontend *fe,
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enum fe_status *status)
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{
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struct vp7045_fe_state *state = fe->demodulator_priv;
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u8 s0 = vp7045_read_reg(state->d,0x00),
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s1 = vp7045_read_reg(state->d,0x01),
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s3 = vp7045_read_reg(state->d,0x03);
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*status = 0;
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if (s0 & (1 << 4))
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*status |= FE_HAS_CARRIER;
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if (s0 & (1 << 1))
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*status |= FE_HAS_VITERBI;
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if (s0 & (1 << 5))
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*status |= FE_HAS_LOCK;
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if (s1 & (1 << 1))
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*status |= FE_HAS_SYNC;
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if (s3 & (1 << 6))
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*status |= FE_HAS_SIGNAL;
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if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
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(FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
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*status &= ~FE_HAS_LOCK;
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return 0;
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}
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static int vp7045_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
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{
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struct vp7045_fe_state *state = fe->demodulator_priv;
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*ber = (vp7045_read_reg(state->d, 0x0D) << 16) |
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(vp7045_read_reg(state->d, 0x0E) << 8) |
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vp7045_read_reg(state->d, 0x0F);
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return 0;
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}
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static int vp7045_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
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{
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struct vp7045_fe_state *state = fe->demodulator_priv;
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*unc = (vp7045_read_reg(state->d, 0x10) << 8) |
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vp7045_read_reg(state->d, 0x11);
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return 0;
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}
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static int vp7045_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
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{
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struct vp7045_fe_state *state = fe->demodulator_priv;
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u16 signal = (vp7045_read_reg(state->d, 0x14) << 8) |
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vp7045_read_reg(state->d, 0x15);
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*strength = ~signal;
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return 0;
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}
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static int vp7045_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
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{
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struct vp7045_fe_state *state = fe->demodulator_priv;
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u8 _snr = vp7045_read_reg(state->d, 0x09);
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*snr = (_snr << 8) | _snr;
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return 0;
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}
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static int vp7045_fe_init(struct dvb_frontend* fe)
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{
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return 0;
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}
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static int vp7045_fe_sleep(struct dvb_frontend* fe)
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{
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return 0;
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}
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static int vp7045_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
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{
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tune->min_delay_ms = 800;
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return 0;
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}
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static int vp7045_fe_set_frontend(struct dvb_frontend *fe)
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{
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struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
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struct vp7045_fe_state *state = fe->demodulator_priv;
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u8 buf[5];
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u32 freq = fep->frequency / 1000;
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buf[0] = (freq >> 16) & 0xff;
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buf[1] = (freq >> 8) & 0xff;
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buf[2] = freq & 0xff;
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buf[3] = 0;
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switch (fep->bandwidth_hz) {
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case 8000000:
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buf[4] = 8;
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break;
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case 7000000:
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buf[4] = 7;
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break;
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case 6000000:
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buf[4] = 6;
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break;
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default:
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return -EINVAL;
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}
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vp7045_usb_op(state->d,LOCK_TUNER_COMMAND,buf,5,NULL,0,200);
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return 0;
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}
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static void vp7045_fe_release(struct dvb_frontend* fe)
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{
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struct vp7045_fe_state *state = fe->demodulator_priv;
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kfree(state);
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}
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static const struct dvb_frontend_ops vp7045_fe_ops;
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struct dvb_frontend * vp7045_fe_attach(struct dvb_usb_device *d)
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{
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struct vp7045_fe_state *s = kzalloc(sizeof(struct vp7045_fe_state), GFP_KERNEL);
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if (s == NULL)
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goto error;
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s->d = d;
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memcpy(&s->fe.ops, &vp7045_fe_ops, sizeof(struct dvb_frontend_ops));
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s->fe.demodulator_priv = s;
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return &s->fe;
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error:
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return NULL;
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}
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static const struct dvb_frontend_ops vp7045_fe_ops = {
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.delsys = { SYS_DVBT },
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.info = {
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.name = "Twinhan VP7045/46 USB DVB-T",
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.frequency_min_hz = 44250 * kHz,
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.frequency_max_hz = 867250 * kHz,
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.frequency_stepsize_hz = 1 * kHz,
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.caps = FE_CAN_INVERSION_AUTO |
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FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
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FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
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FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
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FE_CAN_TRANSMISSION_MODE_AUTO |
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FE_CAN_GUARD_INTERVAL_AUTO |
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FE_CAN_RECOVER |
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FE_CAN_HIERARCHY_AUTO,
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},
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.release = vp7045_fe_release,
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.init = vp7045_fe_init,
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.sleep = vp7045_fe_sleep,
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.set_frontend = vp7045_fe_set_frontend,
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.get_tune_settings = vp7045_fe_get_tune_settings,
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.read_status = vp7045_fe_read_status,
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.read_ber = vp7045_fe_read_ber,
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.read_signal_strength = vp7045_fe_read_signal_strength,
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.read_snr = vp7045_fe_read_snr,
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.read_ucblocks = vp7045_fe_read_unc_blocks,
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};
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