diff options
Diffstat (limited to 'drivers/media/usb/dvb-usb/dtt200u-fe.c')
| -rw-r--r-- | drivers/media/usb/dvb-usb/dtt200u-fe.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/drivers/media/usb/dvb-usb/dtt200u-fe.c b/drivers/media/usb/dvb-usb/dtt200u-fe.c new file mode 100644 index 0000000000..586afe22d8 --- /dev/null +++ b/drivers/media/usb/dvb-usb/dtt200u-fe.c @@ -0,0 +1,257 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Frontend part of the Linux driver for the WideView/ Yakumo/ Hama/ + * Typhoon/ Yuan DVB-T USB2.0 receiver. + * + * Copyright (C) 2005 Patrick Boettcher <patrick.boettcher@posteo.de> + * + * see Documentation/driver-api/media/drivers/dvb-usb.rst for more information + */ +#include "dtt200u.h" + +struct dtt200u_fe_state { + struct dvb_usb_device *d; + + enum fe_status stat; + + struct dtv_frontend_properties fep; + struct dvb_frontend frontend; + + unsigned char data[80]; + struct mutex data_mutex; +}; + +static int dtt200u_fe_read_status(struct dvb_frontend *fe, + enum fe_status *stat) +{ + struct dtt200u_fe_state *state = fe->demodulator_priv; + int ret; + + mutex_lock(&state->data_mutex); + state->data[0] = GET_TUNE_STATUS; + + ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 3, 0); + if (ret < 0) { + *stat = 0; + mutex_unlock(&state->data_mutex); + return ret; + } + + switch (state->data[0]) { + case 0x01: + *stat = FE_HAS_SIGNAL | FE_HAS_CARRIER | + FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK; + break; + case 0x00: /* pending */ + *stat = FE_TIMEDOUT; /* during set_frontend */ + break; + default: + case 0x02: /* failed */ + *stat = 0; + break; + } + mutex_unlock(&state->data_mutex); + return 0; +} + +static int dtt200u_fe_read_ber(struct dvb_frontend* fe, u32 *ber) +{ + struct dtt200u_fe_state *state = fe->demodulator_priv; + int ret; + + mutex_lock(&state->data_mutex); + state->data[0] = GET_VIT_ERR_CNT; + + ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 3, 0); + if (ret >= 0) + *ber = (state->data[0] << 16) | (state->data[1] << 8) | state->data[2]; + + mutex_unlock(&state->data_mutex); + return ret; +} + +static int dtt200u_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc) +{ + struct dtt200u_fe_state *state = fe->demodulator_priv; + int ret; + + mutex_lock(&state->data_mutex); + state->data[0] = GET_RS_UNCOR_BLK_CNT; + + ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 2, 0); + if (ret >= 0) + *unc = (state->data[0] << 8) | state->data[1]; + + mutex_unlock(&state->data_mutex); + return ret; +} + +static int dtt200u_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength) +{ + struct dtt200u_fe_state *state = fe->demodulator_priv; + int ret; + + mutex_lock(&state->data_mutex); + state->data[0] = GET_AGC; + + ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 1, 0); + if (ret >= 0) + *strength = (state->data[0] << 8) | state->data[0]; + + mutex_unlock(&state->data_mutex); + return ret; +} + +static int dtt200u_fe_read_snr(struct dvb_frontend* fe, u16 *snr) +{ + struct dtt200u_fe_state *state = fe->demodulator_priv; + int ret; + + mutex_lock(&state->data_mutex); + state->data[0] = GET_SNR; + + ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 1, 0); + if (ret >= 0) + *snr = ~((state->data[0] << 8) | state->data[0]); + + mutex_unlock(&state->data_mutex); + return ret; +} + +static int dtt200u_fe_init(struct dvb_frontend* fe) +{ + struct dtt200u_fe_state *state = fe->demodulator_priv; + int ret; + + mutex_lock(&state->data_mutex); + state->data[0] = SET_INIT; + + ret = dvb_usb_generic_write(state->d, state->data, 1); + mutex_unlock(&state->data_mutex); + + return ret; +} + +static int dtt200u_fe_sleep(struct dvb_frontend* fe) +{ + return dtt200u_fe_init(fe); +} + +static int dtt200u_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune) +{ + tune->min_delay_ms = 1500; + tune->step_size = 0; + tune->max_drift = 0; + return 0; +} + +static int dtt200u_fe_set_frontend(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *fep = &fe->dtv_property_cache; + struct dtt200u_fe_state *state = fe->demodulator_priv; + int ret; + u16 freq = fep->frequency / 250000; + + mutex_lock(&state->data_mutex); + state->data[0] = SET_BANDWIDTH; + switch (fep->bandwidth_hz) { + case 8000000: + state->data[1] = 8; + break; + case 7000000: + state->data[1] = 7; + break; + case 6000000: + state->data[1] = 6; + break; + default: + ret = -EINVAL; + goto ret; + } + + ret = dvb_usb_generic_write(state->d, state->data, 2); + if (ret < 0) + goto ret; + + state->data[0] = SET_RF_FREQ; + state->data[1] = freq & 0xff; + state->data[2] = (freq >> 8) & 0xff; + ret = dvb_usb_generic_write(state->d, state->data, 3); + if (ret < 0) + goto ret; + +ret: + mutex_unlock(&state->data_mutex); + return ret; +} + +static int dtt200u_fe_get_frontend(struct dvb_frontend* fe, + struct dtv_frontend_properties *fep) +{ + struct dtt200u_fe_state *state = fe->demodulator_priv; + + memcpy(fep, &state->fep, sizeof(struct dtv_frontend_properties)); + return 0; +} + +static void dtt200u_fe_release(struct dvb_frontend* fe) +{ + struct dtt200u_fe_state *state = fe->demodulator_priv; + kfree(state); +} + +static const struct dvb_frontend_ops dtt200u_fe_ops; + +struct dvb_frontend* dtt200u_fe_attach(struct dvb_usb_device *d) +{ + struct dtt200u_fe_state* state = NULL; + + /* allocate memory for the internal state */ + state = kzalloc(sizeof(struct dtt200u_fe_state), GFP_KERNEL); + if (state == NULL) + goto error; + + deb_info("attaching frontend dtt200u\n"); + + state->d = d; + mutex_init(&state->data_mutex); + + memcpy(&state->frontend.ops,&dtt200u_fe_ops,sizeof(struct dvb_frontend_ops)); + state->frontend.demodulator_priv = state; + + return &state->frontend; +error: + return NULL; +} + +static const struct dvb_frontend_ops dtt200u_fe_ops = { + .delsys = { SYS_DVBT }, + .info = { + .name = "WideView USB DVB-T", + .frequency_min_hz = 44250 * kHz, + .frequency_max_hz = 867250 * kHz, + .frequency_stepsize_hz = 250 * kHz, + .caps = FE_CAN_INVERSION_AUTO | + FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | + FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | + FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO | + FE_CAN_TRANSMISSION_MODE_AUTO | + FE_CAN_GUARD_INTERVAL_AUTO | + FE_CAN_RECOVER | + FE_CAN_HIERARCHY_AUTO, + }, + + .release = dtt200u_fe_release, + + .init = dtt200u_fe_init, + .sleep = dtt200u_fe_sleep, + + .set_frontend = dtt200u_fe_set_frontend, + .get_frontend = dtt200u_fe_get_frontend, + .get_tune_settings = dtt200u_fe_get_tune_settings, + + .read_status = dtt200u_fe_read_status, + .read_ber = dtt200u_fe_read_ber, + .read_signal_strength = dtt200u_fe_read_signal_strength, + .read_snr = dtt200u_fe_read_snr, + .read_ucblocks = dtt200u_fe_read_unc_blocks, +}; 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