// SPDX-License-Identifier: GPL-2.0-only
/* DVB frontend part of the Linux driver for the TwinhanDTV StarBox USB2.0
 * DVB-S receiver.
 *
 * Copyright (C) 2005 Ralph Metzler <rjkm@metzlerbros.de>
 *                    Metzler Brothers Systementwicklung GbR
 *
 * Copyright (C) 2005 Patrick Boettcher <patrick.boettcher@posteo.de>
 *
 * Thanks to Twinhan who kindly provided hardware and information.
 *
 * This file can be removed soon, after the DST-driver is rewritten to provice
 * the frontend-controlling separately.
 *
 * see Documentation/media/dvb-drivers/dvb-usb.rst for more information
 */
#include "vp702x.h"

struct vp702x_fe_state {
	struct dvb_frontend fe;
	struct dvb_usb_device *d;

	struct dvb_frontend_ops ops;

	enum fe_sec_voltage voltage;
	enum fe_sec_tone_mode tone_mode;

	u8 lnb_buf[8];

	u8 lock;
	u8 sig;
	u8 snr;

	unsigned long next_status_check;
	unsigned long status_check_interval;
};

static int vp702x_fe_refresh_state(struct vp702x_fe_state *st)
{
	struct vp702x_device_state *dst = st->d->priv;
	u8 *buf;

	if (time_after(jiffies, st->next_status_check)) {
		mutex_lock(&dst->buf_mutex);
		buf = dst->buf;

		vp702x_usb_in_op(st->d, READ_STATUS, 0, 0, buf, 10);
		st->lock = buf[4];

		vp702x_usb_in_op(st->d, READ_TUNER_REG_REQ, 0x11, 0, buf, 1);
		st->snr = buf[0];

		vp702x_usb_in_op(st->d, READ_TUNER_REG_REQ, 0x15, 0, buf, 1);
		st->sig = buf[0];

		mutex_unlock(&dst->buf_mutex);
		st->next_status_check = jiffies + (st->status_check_interval*HZ)/1000;
	}
	return 0;
}

static u8 vp702x_chksum(u8 *buf,int f, int count)
{
	u8 s = 0;
	int i;
	for (i = f; i < f+count; i++)
		s += buf[i];
	return ~s+1;
}

static int vp702x_fe_read_status(struct dvb_frontend *fe,
				 enum fe_status *status)
{
	struct vp702x_fe_state *st = fe->demodulator_priv;
	vp702x_fe_refresh_state(st);
	deb_fe("%s\n",__func__);

	if (st->lock == 0)
		*status = FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI | FE_HAS_SIGNAL | FE_HAS_CARRIER;
	else
		*status = 0;

	if (*status & FE_HAS_LOCK)
		st->status_check_interval = 1000;
	else
		st->status_check_interval = 250;
	return 0;
}

/* not supported by this Frontend */
static int vp702x_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
{
	struct vp702x_fe_state *st = fe->demodulator_priv;
	vp702x_fe_refresh_state(st);
	*ber = 0;
	return 0;
}

/* not supported by this Frontend */
static int vp702x_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
{
	struct vp702x_fe_state *st = fe->demodulator_priv;
	vp702x_fe_refresh_state(st);
	*unc = 0;
	return 0;
}

static int vp702x_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
{
	struct vp702x_fe_state *st = fe->demodulator_priv;
	vp702x_fe_refresh_state(st);

	*strength = (st->sig << 8) | st->sig;
	return 0;
}

static int vp702x_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
{
	u8 _snr;
	struct vp702x_fe_state *st = fe->demodulator_priv;
	vp702x_fe_refresh_state(st);

	_snr = (st->snr & 0x1f) * 0xff / 0x1f;
	*snr = (_snr << 8) | _snr;
	return 0;
}

static int vp702x_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
{
	deb_fe("%s\n",__func__);
	tune->min_delay_ms = 2000;
	return 0;
}

static int vp702x_fe_set_frontend(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
	struct vp702x_fe_state *st = fe->demodulator_priv;
	struct vp702x_device_state *dst = st->d->priv;
	u32 freq = fep->frequency/1000;
	/*CalFrequency*/
/*	u16 frequencyRef[16] = { 2, 4, 8, 16, 32, 64, 128, 256, 24, 5, 10, 20, 40, 80, 160, 320 }; */
	u64 sr;
	u8 *cmd;

	mutex_lock(&dst->buf_mutex);

	cmd = dst->buf;
	memset(cmd, 0, 10);

	cmd[0] = (freq >> 8) & 0x7f;
	cmd[1] =  freq       & 0xff;
	cmd[2] = 1; /* divrate == 4 -> frequencyRef[1] -> 1 here */

	sr = (u64) (fep->symbol_rate/1000) << 20;
	do_div(sr,88000);
	cmd[3] = (sr >> 12) & 0xff;
	cmd[4] = (sr >> 4)  & 0xff;
	cmd[5] = (sr << 4)  & 0xf0;

	deb_fe("setting frontend to: %u -> %u (%x) LNB-based GHz, symbolrate: %d -> %lu (%lx)\n",
			fep->frequency, freq, freq, fep->symbol_rate,
			(unsigned long) sr, (unsigned long) sr);

/*	if (fep->inversion == INVERSION_ON)
		cmd[6] |= 0x80; */

	if (st->voltage == SEC_VOLTAGE_18)
		cmd[6] |= 0x40;

/*	if (fep->symbol_rate > 8000000)
		cmd[6] |= 0x20;

	if (fep->frequency < 1531000)
		cmd[6] |= 0x04;

	if (st->tone_mode == SEC_TONE_ON)
		cmd[6] |= 0x01;*/

	cmd[7] = vp702x_chksum(cmd,0,7);

	st->status_check_interval = 250;
	st->next_status_check = jiffies;

	vp702x_usb_inout_op(st->d, cmd, 8, cmd, 10, 100);

	if (cmd[2] == 0 && cmd[3] == 0)
		deb_fe("tuning failed.\n");
	else
		deb_fe("tuning succeeded.\n");

	mutex_unlock(&dst->buf_mutex);

	return 0;
}

static int vp702x_fe_init(struct dvb_frontend *fe)
{
	struct vp702x_fe_state *st = fe->demodulator_priv;
	deb_fe("%s\n",__func__);
	vp702x_usb_in_op(st->d, RESET_TUNER, 0, 0, NULL, 0);
	return 0;
}

static int vp702x_fe_sleep(struct dvb_frontend *fe)
{
	deb_fe("%s\n",__func__);
	return 0;
}

static int vp702x_fe_send_diseqc_msg (struct dvb_frontend* fe,
				    struct dvb_diseqc_master_cmd *m)
{
	u8 *cmd;
	struct vp702x_fe_state *st = fe->demodulator_priv;
	struct vp702x_device_state *dst = st->d->priv;

	deb_fe("%s\n",__func__);

	if (m->msg_len > 4)
		return -EINVAL;

	mutex_lock(&dst->buf_mutex);

	cmd = dst->buf;
	cmd[1] = SET_DISEQC_CMD;
	cmd[2] = m->msg_len;
	memcpy(&cmd[3], m->msg, m->msg_len);
	cmd[7] = vp702x_chksum(cmd, 0, 7);

	vp702x_usb_inout_op(st->d, cmd, 8, cmd, 10, 100);

	if (cmd[2] == 0 && cmd[3] == 0)
		deb_fe("diseqc cmd failed.\n");
	else
		deb_fe("diseqc cmd succeeded.\n");

	mutex_unlock(&dst->buf_mutex);

	return 0;
}

static int vp702x_fe_send_diseqc_burst(struct dvb_frontend *fe,
				       enum fe_sec_mini_cmd burst)
{
	deb_fe("%s\n",__func__);
	return 0;
}

static int vp702x_fe_set_tone(struct dvb_frontend *fe,
			      enum fe_sec_tone_mode tone)
{
	struct vp702x_fe_state *st = fe->demodulator_priv;
	struct vp702x_device_state *dst = st->d->priv;
	u8 *buf;

	deb_fe("%s\n",__func__);

	st->tone_mode = tone;

	if (tone == SEC_TONE_ON)
		st->lnb_buf[2] = 0x02;
	else
		st->lnb_buf[2] = 0x00;

	st->lnb_buf[7] = vp702x_chksum(st->lnb_buf, 0, 7);

	mutex_lock(&dst->buf_mutex);

	buf = dst->buf;
	memcpy(buf, st->lnb_buf, 8);

	vp702x_usb_inout_op(st->d, buf, 8, buf, 10, 100);
	if (buf[2] == 0 && buf[3] == 0)
		deb_fe("set_tone cmd failed.\n");
	else
		deb_fe("set_tone cmd succeeded.\n");

	mutex_unlock(&dst->buf_mutex);

	return 0;
}

static int vp702x_fe_set_voltage(struct dvb_frontend *fe,
				 enum fe_sec_voltage voltage)
{
	struct vp702x_fe_state *st = fe->demodulator_priv;
	struct vp702x_device_state *dst = st->d->priv;
	u8 *buf;
	deb_fe("%s\n",__func__);

	st->voltage = voltage;

	if (voltage != SEC_VOLTAGE_OFF)
		st->lnb_buf[4] = 0x01;
	else
		st->lnb_buf[4] = 0x00;

	st->lnb_buf[7] = vp702x_chksum(st->lnb_buf, 0, 7);

	mutex_lock(&dst->buf_mutex);

	buf = dst->buf;
	memcpy(buf, st->lnb_buf, 8);

	vp702x_usb_inout_op(st->d, buf, 8, buf, 10, 100);
	if (buf[2] == 0 && buf[3] == 0)
		deb_fe("set_voltage cmd failed.\n");
	else
		deb_fe("set_voltage cmd succeeded.\n");

	mutex_unlock(&dst->buf_mutex);
	return 0;
}

static void vp702x_fe_release(struct dvb_frontend* fe)
{
	struct vp702x_fe_state *st = fe->demodulator_priv;
	kfree(st);
}

static const struct dvb_frontend_ops vp702x_fe_ops;

struct dvb_frontend * vp702x_fe_attach(struct dvb_usb_device *d)
{
	struct vp702x_fe_state *s = kzalloc(sizeof(struct vp702x_fe_state), GFP_KERNEL);
	if (s == NULL)
		goto error;

	s->d = d;

	memcpy(&s->fe.ops,&vp702x_fe_ops,sizeof(struct dvb_frontend_ops));
	s->fe.demodulator_priv = s;

	s->lnb_buf[1] = SET_LNB_POWER;
	s->lnb_buf[3] = 0xff; /* 0=tone burst, 2=data burst, ff=off */

	return &s->fe;
error:
	return NULL;
}


static const struct dvb_frontend_ops vp702x_fe_ops = {
	.delsys = { SYS_DVBS },
	.info = {
		.name           = "Twinhan DST-like frontend (VP7021/VP7020) DVB-S",
		.frequency_min_hz       =  950 * MHz,
		.frequency_max_hz       = 2150 * MHz,
		.frequency_stepsize_hz  =    1 * MHz,
		.symbol_rate_min     = 1000000,
		.symbol_rate_max     = 45000000,
		.symbol_rate_tolerance = 500,  /* ppm */
		.caps = 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_QPSK |
		FE_CAN_FEC_AUTO
	},
	.release = vp702x_fe_release,

	.init  = vp702x_fe_init,
	.sleep = vp702x_fe_sleep,

	.set_frontend = vp702x_fe_set_frontend,
	.get_tune_settings = vp702x_fe_get_tune_settings,

	.read_status = vp702x_fe_read_status,
	.read_ber = vp702x_fe_read_ber,
	.read_signal_strength = vp702x_fe_read_signal_strength,
	.read_snr = vp702x_fe_read_snr,
	.read_ucblocks = vp702x_fe_read_unc_blocks,

	.diseqc_send_master_cmd = vp702x_fe_send_diseqc_msg,
	.diseqc_send_burst = vp702x_fe_send_diseqc_burst,
	.set_tone = vp702x_fe_set_tone,
	.set_voltage = vp702x_fe_set_voltage,
};