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1// SPDX-License-Identifier: GPL-2.0-only2/* Frontend part of the Linux driver for the WideView/ Yakumo/ Hama/3 * Typhoon/ Yuan DVB-T USB2.0 receiver.4 *5 * Copyright (C) 2005 Patrick Boettcher <patrick.boettcher@posteo.de>6 *7 * see Documentation/driver-api/media/drivers/dvb-usb.rst for more information8 */9#include "dtt200u.h"10 11struct dtt200u_fe_state {12 struct dvb_usb_device *d;13 14 enum fe_status stat;15 16 struct dtv_frontend_properties fep;17 struct dvb_frontend frontend;18 19 unsigned char data[80];20 struct mutex data_mutex;21};22 23static 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 int ret;28 29 mutex_lock(&state->data_mutex);30 state->data[0] = GET_TUNE_STATUS;31 32 ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 3, 0);33 if (ret < 0) {34 *stat = 0;35 mutex_unlock(&state->data_mutex);36 return ret;37 }38 39 switch (state->data[0]) {40 case 0x01:41 *stat = FE_HAS_SIGNAL | FE_HAS_CARRIER |42 FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;43 break;44 case 0x00: /* pending */45 *stat = FE_TIMEDOUT; /* during set_frontend */46 break;47 default:48 case 0x02: /* failed */49 *stat = 0;50 break;51 }52 mutex_unlock(&state->data_mutex);53 return 0;54}55 56static int dtt200u_fe_read_ber(struct dvb_frontend* fe, u32 *ber)57{58 struct dtt200u_fe_state *state = fe->demodulator_priv;59 int ret;60 61 mutex_lock(&state->data_mutex);62 state->data[0] = GET_VIT_ERR_CNT;63 64 ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 3, 0);65 if (ret >= 0)66 *ber = (state->data[0] << 16) | (state->data[1] << 8) | state->data[2];67 68 mutex_unlock(&state->data_mutex);69 return ret;70}71 72static int dtt200u_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)73{74 struct dtt200u_fe_state *state = fe->demodulator_priv;75 int ret;76 77 mutex_lock(&state->data_mutex);78 state->data[0] = GET_RS_UNCOR_BLK_CNT;79 80 ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 2, 0);81 if (ret >= 0)82 *unc = (state->data[0] << 8) | state->data[1];83 84 mutex_unlock(&state->data_mutex);85 return ret;86}87 88static int dtt200u_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)89{90 struct dtt200u_fe_state *state = fe->demodulator_priv;91 int ret;92 93 mutex_lock(&state->data_mutex);94 state->data[0] = GET_AGC;95 96 ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 1, 0);97 if (ret >= 0)98 *strength = (state->data[0] << 8) | state->data[0];99 100 mutex_unlock(&state->data_mutex);101 return ret;102}103 104static int dtt200u_fe_read_snr(struct dvb_frontend* fe, u16 *snr)105{106 struct dtt200u_fe_state *state = fe->demodulator_priv;107 int ret;108 109 mutex_lock(&state->data_mutex);110 state->data[0] = GET_SNR;111 112 ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 1, 0);113 if (ret >= 0)114 *snr = ~((state->data[0] << 8) | state->data[0]);115 116 mutex_unlock(&state->data_mutex);117 return ret;118}119 120static int dtt200u_fe_init(struct dvb_frontend* fe)121{122 struct dtt200u_fe_state *state = fe->demodulator_priv;123 int ret;124 125 mutex_lock(&state->data_mutex);126 state->data[0] = SET_INIT;127 128 ret = dvb_usb_generic_write(state->d, state->data, 1);129 mutex_unlock(&state->data_mutex);130 131 return ret;132}133 134static int dtt200u_fe_sleep(struct dvb_frontend* fe)135{136 return dtt200u_fe_init(fe);137}138 139static int dtt200u_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)140{141 tune->min_delay_ms = 1500;142 tune->step_size = 0;143 tune->max_drift = 0;144 return 0;145}146 147static int dtt200u_fe_set_frontend(struct dvb_frontend *fe)148{149 struct dtv_frontend_properties *fep = &fe->dtv_property_cache;150 struct dtt200u_fe_state *state = fe->demodulator_priv;151 int ret;152 u16 freq = fep->frequency / 250000;153 154 mutex_lock(&state->data_mutex);155 state->data[0] = SET_BANDWIDTH;156 switch (fep->bandwidth_hz) {157 case 8000000:158 state->data[1] = 8;159 break;160 case 7000000:161 state->data[1] = 7;162 break;163 case 6000000:164 state->data[1] = 6;165 break;166 default:167 ret = -EINVAL;168 goto ret;169 }170 171 ret = dvb_usb_generic_write(state->d, state->data, 2);172 if (ret < 0)173 goto ret;174 175 state->data[0] = SET_RF_FREQ;176 state->data[1] = freq & 0xff;177 state->data[2] = (freq >> 8) & 0xff;178 ret = dvb_usb_generic_write(state->d, state->data, 3);179 if (ret < 0)180 goto ret;181 182ret:183 mutex_unlock(&state->data_mutex);184 return ret;185}186 187static int dtt200u_fe_get_frontend(struct dvb_frontend* fe,188 struct dtv_frontend_properties *fep)189{190 struct dtt200u_fe_state *state = fe->demodulator_priv;191 192 memcpy(fep, &state->fep, sizeof(struct dtv_frontend_properties));193 return 0;194}195 196static void dtt200u_fe_release(struct dvb_frontend* fe)197{198 struct dtt200u_fe_state *state = fe->demodulator_priv;199 kfree(state);200}201 202static const struct dvb_frontend_ops dtt200u_fe_ops;203 204struct dvb_frontend* dtt200u_fe_attach(struct dvb_usb_device *d)205{206 struct dtt200u_fe_state* state = NULL;207 208 /* allocate memory for the internal state */209 state = kzalloc(sizeof(struct dtt200u_fe_state), GFP_KERNEL);210 if (state == NULL)211 goto error;212 213 deb_info("attaching frontend dtt200u\n");214 215 state->d = d;216 mutex_init(&state->data_mutex);217 218 memcpy(&state->frontend.ops,&dtt200u_fe_ops,sizeof(struct dvb_frontend_ops));219 state->frontend.demodulator_priv = state;220 221 return &state->frontend;222error:223 return NULL;224}225 226static const struct dvb_frontend_ops dtt200u_fe_ops = {227 .delsys = { SYS_DVBT },228 .info = {229 .name = "WideView USB DVB-T",230 .frequency_min_hz = 44250 * kHz,231 .frequency_max_hz = 867250 * kHz,232 .frequency_stepsize_hz = 250 * kHz,233 .caps = FE_CAN_INVERSION_AUTO |234 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |235 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |236 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |237 FE_CAN_TRANSMISSION_MODE_AUTO |238 FE_CAN_GUARD_INTERVAL_AUTO |239 FE_CAN_RECOVER |240 FE_CAN_HIERARCHY_AUTO,241 },242 243 .release = dtt200u_fe_release,244 245 .init = dtt200u_fe_init,246 .sleep = dtt200u_fe_sleep,247 248 .set_frontend = dtt200u_fe_set_frontend,249 .get_frontend = dtt200u_fe_get_frontend,250 .get_tune_settings = dtt200u_fe_get_tune_settings,251 252 .read_status = dtt200u_fe_read_status,253 .read_ber = dtt200u_fe_read_ber,254 .read_signal_strength = dtt200u_fe_read_signal_strength,255 .read_snr = dtt200u_fe_read_snr,256 .read_ucblocks = dtt200u_fe_read_unc_blocks,257};258