1// SPDX-License-Identifier: GPL-2.0-only
2/* DVB frontend part of the Linux driver for the TwinhanDTV StarBox USB2.0
3 * DVB-S receiver.
4 *
5 * Copyright (C) 2005 Ralph Metzler <rjkm@metzlerbros.de>
6 *                    Metzler Brothers Systementwicklung GbR
7 *
8 * Copyright (C) 2005 Patrick Boettcher <patrick.boettcher@posteo.de>
9 *
10 * Thanks to Twinhan who kindly provided hardware and information.
11 *
12 * This file can be removed soon, after the DST-driver is rewritten to provice
13 * the frontend-controlling separately.
14 *
15 * see Documentation/driver-api/media/drivers/dvb-usb.rst for more information
16 */
17#include "vp702x.h"
18
19struct vp702x_fe_state {
20	struct dvb_frontend fe;
21	struct dvb_usb_device *d;
22
23	struct dvb_frontend_ops ops;
24
25	enum fe_sec_voltage voltage;
26	enum fe_sec_tone_mode tone_mode;
27
28	u8 lnb_buf[8];
29
30	u8 lock;
31	u8 sig;
32	u8 snr;
33
34	unsigned long next_status_check;
35	unsigned long status_check_interval;
36};
37
38static int vp702x_fe_refresh_state(struct vp702x_fe_state *st)
39{
40	struct vp702x_device_state *dst = st->d->priv;
41	u8 *buf;
42
43	if (time_after(jiffies, st->next_status_check)) {
44		mutex_lock(&dst->buf_mutex);
45		buf = dst->buf;
46
47		vp702x_usb_in_op(st->d, READ_STATUS, 0, 0, buf, 10);
48		st->lock = buf[4];
49
50		vp702x_usb_in_op(st->d, READ_TUNER_REG_REQ, 0x11, 0, buf, 1);
51		st->snr = buf[0];
52
53		vp702x_usb_in_op(st->d, READ_TUNER_REG_REQ, 0x15, 0, buf, 1);
54		st->sig = buf[0];
55
56		mutex_unlock(&dst->buf_mutex);
57		st->next_status_check = jiffies + (st->status_check_interval*HZ)/1000;
58	}
59	return 0;
60}
61
62static u8 vp702x_chksum(u8 *buf,int f, int count)
63{
64	u8 s = 0;
65	int i;
66	for (i = f; i < f+count; i++)
67		s += buf[i];
68	return ~s+1;
69}
70
71static int vp702x_fe_read_status(struct dvb_frontend *fe,
72				 enum fe_status *status)
73{
74	struct vp702x_fe_state *st = fe->demodulator_priv;
75	vp702x_fe_refresh_state(st);
76	deb_fe("%s\n",__func__);
77
78	if (st->lock == 0)
79		*status = FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI | FE_HAS_SIGNAL | FE_HAS_CARRIER;
80	else
81		*status = 0;
82
83	if (*status & FE_HAS_LOCK)
84		st->status_check_interval = 1000;
85	else
86		st->status_check_interval = 250;
87	return 0;
88}
89
90/* not supported by this Frontend */
91static int vp702x_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
92{
93	struct vp702x_fe_state *st = fe->demodulator_priv;
94	vp702x_fe_refresh_state(st);
95	*ber = 0;
96	return 0;
97}
98
99/* not supported by this Frontend */
100static int vp702x_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
101{
102	struct vp702x_fe_state *st = fe->demodulator_priv;
103	vp702x_fe_refresh_state(st);
104	*unc = 0;
105	return 0;
106}
107
108static int vp702x_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
109{
110	struct vp702x_fe_state *st = fe->demodulator_priv;
111	vp702x_fe_refresh_state(st);
112
113	*strength = (st->sig << 8) | st->sig;
114	return 0;
115}
116
117static int vp702x_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
118{
119	u8 _snr;
120	struct vp702x_fe_state *st = fe->demodulator_priv;
121	vp702x_fe_refresh_state(st);
122
123	_snr = (st->snr & 0x1f) * 0xff / 0x1f;
124	*snr = (_snr << 8) | _snr;
125	return 0;
126}
127
128static int vp702x_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
129{
130	deb_fe("%s\n",__func__);
131	tune->min_delay_ms = 2000;
132	return 0;
133}
134
135static int vp702x_fe_set_frontend(struct dvb_frontend *fe)
136{
137	struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
138	struct vp702x_fe_state *st = fe->demodulator_priv;
139	struct vp702x_device_state *dst = st->d->priv;
140	u32 freq = fep->frequency/1000;
141	/*CalFrequency*/
142/*	u16 frequencyRef[16] = { 2, 4, 8, 16, 32, 64, 128, 256, 24, 5, 10, 20, 40, 80, 160, 320 }; */
143	u64 sr;
144	u8 *cmd;
145
146	mutex_lock(&dst->buf_mutex);
147
148	cmd = dst->buf;
149	memset(cmd, 0, 10);
150
151	cmd[0] = (freq >> 8) & 0x7f;
152	cmd[1] =  freq       & 0xff;
153	cmd[2] = 1; /* divrate == 4 -> frequencyRef[1] -> 1 here */
154
155	sr = (u64) (fep->symbol_rate/1000) << 20;
156	do_div(sr,88000);
157	cmd[3] = (sr >> 12) & 0xff;
158	cmd[4] = (sr >> 4)  & 0xff;
159	cmd[5] = (sr << 4)  & 0xf0;
160
161	deb_fe("setting frontend to: %u -> %u (%x) LNB-based GHz, symbolrate: %d -> %lu (%lx)\n",
162			fep->frequency, freq, freq, fep->symbol_rate,
163			(unsigned long) sr, (unsigned long) sr);
164
165/*	if (fep->inversion == INVERSION_ON)
166		cmd[6] |= 0x80; */
167
168	if (st->voltage == SEC_VOLTAGE_18)
169		cmd[6] |= 0x40;
170
171/*	if (fep->symbol_rate > 8000000)
172		cmd[6] |= 0x20;
173
174	if (fep->frequency < 1531000)
175		cmd[6] |= 0x04;
176
177	if (st->tone_mode == SEC_TONE_ON)
178		cmd[6] |= 0x01;*/
179
180	cmd[7] = vp702x_chksum(cmd,0,7);
181
182	st->status_check_interval = 250;
183	st->next_status_check = jiffies;
184
185	vp702x_usb_inout_op(st->d, cmd, 8, cmd, 10, 100);
186
187	if (cmd[2] == 0 && cmd[3] == 0)
188		deb_fe("tuning failed.\n");
189	else
190		deb_fe("tuning succeeded.\n");
191
192	mutex_unlock(&dst->buf_mutex);
193
194	return 0;
195}
196
197static int vp702x_fe_init(struct dvb_frontend *fe)
198{
199	struct vp702x_fe_state *st = fe->demodulator_priv;
200	deb_fe("%s\n",__func__);
201	vp702x_usb_in_op(st->d, RESET_TUNER, 0, 0, NULL, 0);
202	return 0;
203}
204
205static int vp702x_fe_sleep(struct dvb_frontend *fe)
206{
207	deb_fe("%s\n",__func__);
208	return 0;
209}
210
211static int vp702x_fe_send_diseqc_msg (struct dvb_frontend* fe,
212				    struct dvb_diseqc_master_cmd *m)
213{
214	u8 *cmd;
215	struct vp702x_fe_state *st = fe->demodulator_priv;
216	struct vp702x_device_state *dst = st->d->priv;
217
218	deb_fe("%s\n",__func__);
219
220	if (m->msg_len > 4)
221		return -EINVAL;
222
223	mutex_lock(&dst->buf_mutex);
224
225	cmd = dst->buf;
226	cmd[1] = SET_DISEQC_CMD;
227	cmd[2] = m->msg_len;
228	memcpy(&cmd[3], m->msg, m->msg_len);
229	cmd[7] = vp702x_chksum(cmd, 0, 7);
230
231	vp702x_usb_inout_op(st->d, cmd, 8, cmd, 10, 100);
232
233	if (cmd[2] == 0 && cmd[3] == 0)
234		deb_fe("diseqc cmd failed.\n");
235	else
236		deb_fe("diseqc cmd succeeded.\n");
237
238	mutex_unlock(&dst->buf_mutex);
239
240	return 0;
241}
242
243static int vp702x_fe_send_diseqc_burst(struct dvb_frontend *fe,
244				       enum fe_sec_mini_cmd burst)
245{
246	deb_fe("%s\n",__func__);
247	return 0;
248}
249
250static int vp702x_fe_set_tone(struct dvb_frontend *fe,
251			      enum fe_sec_tone_mode tone)
252{
253	struct vp702x_fe_state *st = fe->demodulator_priv;
254	struct vp702x_device_state *dst = st->d->priv;
255	u8 *buf;
256
257	deb_fe("%s\n",__func__);
258
259	st->tone_mode = tone;
260
261	if (tone == SEC_TONE_ON)
262		st->lnb_buf[2] = 0x02;
263	else
264		st->lnb_buf[2] = 0x00;
265
266	st->lnb_buf[7] = vp702x_chksum(st->lnb_buf, 0, 7);
267
268	mutex_lock(&dst->buf_mutex);
269
270	buf = dst->buf;
271	memcpy(buf, st->lnb_buf, 8);
272
273	vp702x_usb_inout_op(st->d, buf, 8, buf, 10, 100);
274	if (buf[2] == 0 && buf[3] == 0)
275		deb_fe("set_tone cmd failed.\n");
276	else
277		deb_fe("set_tone cmd succeeded.\n");
278
279	mutex_unlock(&dst->buf_mutex);
280
281	return 0;
282}
283
284static int vp702x_fe_set_voltage(struct dvb_frontend *fe,
285				 enum fe_sec_voltage voltage)
286{
287	struct vp702x_fe_state *st = fe->demodulator_priv;
288	struct vp702x_device_state *dst = st->d->priv;
289	u8 *buf;
290	deb_fe("%s\n",__func__);
291
292	st->voltage = voltage;
293
294	if (voltage != SEC_VOLTAGE_OFF)
295		st->lnb_buf[4] = 0x01;
296	else
297		st->lnb_buf[4] = 0x00;
298
299	st->lnb_buf[7] = vp702x_chksum(st->lnb_buf, 0, 7);
300
301	mutex_lock(&dst->buf_mutex);
302
303	buf = dst->buf;
304	memcpy(buf, st->lnb_buf, 8);
305
306	vp702x_usb_inout_op(st->d, buf, 8, buf, 10, 100);
307	if (buf[2] == 0 && buf[3] == 0)
308		deb_fe("set_voltage cmd failed.\n");
309	else
310		deb_fe("set_voltage cmd succeeded.\n");
311
312	mutex_unlock(&dst->buf_mutex);
313	return 0;
314}
315
316static void vp702x_fe_release(struct dvb_frontend* fe)
317{
318	struct vp702x_fe_state *st = fe->demodulator_priv;
319	kfree(st);
320}
321
322static const struct dvb_frontend_ops vp702x_fe_ops;
323
324struct dvb_frontend * vp702x_fe_attach(struct dvb_usb_device *d)
325{
326	struct vp702x_fe_state *s = kzalloc(sizeof(struct vp702x_fe_state), GFP_KERNEL);
327	if (s == NULL)
328		goto error;
329
330	s->d = d;
331
332	memcpy(&s->fe.ops,&vp702x_fe_ops,sizeof(struct dvb_frontend_ops));
333	s->fe.demodulator_priv = s;
334
335	s->lnb_buf[1] = SET_LNB_POWER;
336	s->lnb_buf[3] = 0xff; /* 0=tone burst, 2=data burst, ff=off */
337
338	return &s->fe;
339error:
340	return NULL;
341}
342
343
344static const struct dvb_frontend_ops vp702x_fe_ops = {
345	.delsys = { SYS_DVBS },
346	.info = {
347		.name           = "Twinhan DST-like frontend (VP7021/VP7020) DVB-S",
348		.frequency_min_hz       =  950 * MHz,
349		.frequency_max_hz       = 2150 * MHz,
350		.frequency_stepsize_hz  =    1 * MHz,
351		.symbol_rate_min     = 1000000,
352		.symbol_rate_max     = 45000000,
353		.symbol_rate_tolerance = 500,  /* ppm */
354		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
355		FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
356		FE_CAN_QPSK |
357		FE_CAN_FEC_AUTO
358	},
359	.release = vp702x_fe_release,
360
361	.init  = vp702x_fe_init,
362	.sleep = vp702x_fe_sleep,
363
364	.set_frontend = vp702x_fe_set_frontend,
365	.get_tune_settings = vp702x_fe_get_tune_settings,
366
367	.read_status = vp702x_fe_read_status,
368	.read_ber = vp702x_fe_read_ber,
369	.read_signal_strength = vp702x_fe_read_signal_strength,
370	.read_snr = vp702x_fe_read_snr,
371	.read_ucblocks = vp702x_fe_read_unc_blocks,
372
373	.diseqc_send_master_cmd = vp702x_fe_send_diseqc_msg,
374	.diseqc_send_burst = vp702x_fe_send_diseqc_burst,
375	.set_tone = vp702x_fe_set_tone,
376	.set_voltage = vp702x_fe_set_voltage,
377};
378