1 /* DVB frontend part of the Linux driver for the TwinhanDTV StarBox USB2.0
2  * DVB-S receiver.
3  *
4  * Copyright (C) 2005 Ralph Metzler <rjkm@metzlerbros.de>
5  *                    Metzler Brothers Systementwicklung GbR
6  *
7  * Copyright (C) 2005 Patrick Boettcher <patrick.boettcher@posteo.de>
8  *
9  * Thanks to Twinhan who kindly provided hardware and information.
10  *
11  * This file can be removed soon, after the DST-driver is rewritten to provice
12  * the frontend-controlling separately.
13  *
14  *	This program is free software; you can redistribute it and/or modify it
15  *	under the terms of the GNU General Public License as published by the Free
16  *	Software Foundation, version 2.
17  *
18  * see Documentation/media/dvb-drivers/dvb-usb.rst for more information
19  *
20  */
21 #include "vp702x.h"
22 
23 struct vp702x_fe_state {
24 	struct dvb_frontend fe;
25 	struct dvb_usb_device *d;
26 
27 	struct dvb_frontend_ops ops;
28 
29 	enum fe_sec_voltage voltage;
30 	enum fe_sec_tone_mode tone_mode;
31 
32 	u8 lnb_buf[8];
33 
34 	u8 lock;
35 	u8 sig;
36 	u8 snr;
37 
38 	unsigned long next_status_check;
39 	unsigned long status_check_interval;
40 };
41 
42 static int vp702x_fe_refresh_state(struct vp702x_fe_state *st)
43 {
44 	struct vp702x_device_state *dst = st->d->priv;
45 	u8 *buf;
46 
47 	if (time_after(jiffies, st->next_status_check)) {
48 		mutex_lock(&dst->buf_mutex);
49 		buf = dst->buf;
50 
51 		vp702x_usb_in_op(st->d, READ_STATUS, 0, 0, buf, 10);
52 		st->lock = buf[4];
53 
54 		vp702x_usb_in_op(st->d, READ_TUNER_REG_REQ, 0x11, 0, buf, 1);
55 		st->snr = buf[0];
56 
57 		vp702x_usb_in_op(st->d, READ_TUNER_REG_REQ, 0x15, 0, buf, 1);
58 		st->sig = buf[0];
59 
60 		mutex_unlock(&dst->buf_mutex);
61 		st->next_status_check = jiffies + (st->status_check_interval*HZ)/1000;
62 	}
63 	return 0;
64 }
65 
66 static u8 vp702x_chksum(u8 *buf,int f, int count)
67 {
68 	u8 s = 0;
69 	int i;
70 	for (i = f; i < f+count; i++)
71 		s += buf[i];
72 	return ~s+1;
73 }
74 
75 static int vp702x_fe_read_status(struct dvb_frontend *fe,
76 				 enum fe_status *status)
77 {
78 	struct vp702x_fe_state *st = fe->demodulator_priv;
79 	vp702x_fe_refresh_state(st);
80 	deb_fe("%s\n",__func__);
81 
82 	if (st->lock == 0)
83 		*status = FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI | FE_HAS_SIGNAL | FE_HAS_CARRIER;
84 	else
85 		*status = 0;
86 
87 	if (*status & FE_HAS_LOCK)
88 		st->status_check_interval = 1000;
89 	else
90 		st->status_check_interval = 250;
91 	return 0;
92 }
93 
94 /* not supported by this Frontend */
95 static int vp702x_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
96 {
97 	struct vp702x_fe_state *st = fe->demodulator_priv;
98 	vp702x_fe_refresh_state(st);
99 	*ber = 0;
100 	return 0;
101 }
102 
103 /* not supported by this Frontend */
104 static int vp702x_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
105 {
106 	struct vp702x_fe_state *st = fe->demodulator_priv;
107 	vp702x_fe_refresh_state(st);
108 	*unc = 0;
109 	return 0;
110 }
111 
112 static int vp702x_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
113 {
114 	struct vp702x_fe_state *st = fe->demodulator_priv;
115 	vp702x_fe_refresh_state(st);
116 
117 	*strength = (st->sig << 8) | st->sig;
118 	return 0;
119 }
120 
121 static int vp702x_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
122 {
123 	u8 _snr;
124 	struct vp702x_fe_state *st = fe->demodulator_priv;
125 	vp702x_fe_refresh_state(st);
126 
127 	_snr = (st->snr & 0x1f) * 0xff / 0x1f;
128 	*snr = (_snr << 8) | _snr;
129 	return 0;
130 }
131 
132 static int vp702x_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
133 {
134 	deb_fe("%s\n",__func__);
135 	tune->min_delay_ms = 2000;
136 	return 0;
137 }
138 
139 static int vp702x_fe_set_frontend(struct dvb_frontend *fe)
140 {
141 	struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
142 	struct vp702x_fe_state *st = fe->demodulator_priv;
143 	struct vp702x_device_state *dst = st->d->priv;
144 	u32 freq = fep->frequency/1000;
145 	/*CalFrequency*/
146 /*	u16 frequencyRef[16] = { 2, 4, 8, 16, 32, 64, 128, 256, 24, 5, 10, 20, 40, 80, 160, 320 }; */
147 	u64 sr;
148 	u8 *cmd;
149 
150 	mutex_lock(&dst->buf_mutex);
151 
152 	cmd = dst->buf;
153 	memset(cmd, 0, 10);
154 
155 	cmd[0] = (freq >> 8) & 0x7f;
156 	cmd[1] =  freq       & 0xff;
157 	cmd[2] = 1; /* divrate == 4 -> frequencyRef[1] -> 1 here */
158 
159 	sr = (u64) (fep->symbol_rate/1000) << 20;
160 	do_div(sr,88000);
161 	cmd[3] = (sr >> 12) & 0xff;
162 	cmd[4] = (sr >> 4)  & 0xff;
163 	cmd[5] = (sr << 4)  & 0xf0;
164 
165 	deb_fe("setting frontend to: %u -> %u (%x) LNB-based GHz, symbolrate: %d -> %lu (%lx)\n",
166 			fep->frequency, freq, freq, fep->symbol_rate,
167 			(unsigned long) sr, (unsigned long) sr);
168 
169 /*	if (fep->inversion == INVERSION_ON)
170 		cmd[6] |= 0x80; */
171 
172 	if (st->voltage == SEC_VOLTAGE_18)
173 		cmd[6] |= 0x40;
174 
175 /*	if (fep->symbol_rate > 8000000)
176 		cmd[6] |= 0x20;
177 
178 	if (fep->frequency < 1531000)
179 		cmd[6] |= 0x04;
180 
181 	if (st->tone_mode == SEC_TONE_ON)
182 		cmd[6] |= 0x01;*/
183 
184 	cmd[7] = vp702x_chksum(cmd,0,7);
185 
186 	st->status_check_interval = 250;
187 	st->next_status_check = jiffies;
188 
189 	vp702x_usb_inout_op(st->d, cmd, 8, cmd, 10, 100);
190 
191 	if (cmd[2] == 0 && cmd[3] == 0)
192 		deb_fe("tuning failed.\n");
193 	else
194 		deb_fe("tuning succeeded.\n");
195 
196 	mutex_unlock(&dst->buf_mutex);
197 
198 	return 0;
199 }
200 
201 static int vp702x_fe_init(struct dvb_frontend *fe)
202 {
203 	struct vp702x_fe_state *st = fe->demodulator_priv;
204 	deb_fe("%s\n",__func__);
205 	vp702x_usb_in_op(st->d, RESET_TUNER, 0, 0, NULL, 0);
206 	return 0;
207 }
208 
209 static int vp702x_fe_sleep(struct dvb_frontend *fe)
210 {
211 	deb_fe("%s\n",__func__);
212 	return 0;
213 }
214 
215 static int vp702x_fe_send_diseqc_msg (struct dvb_frontend* fe,
216 				    struct dvb_diseqc_master_cmd *m)
217 {
218 	u8 *cmd;
219 	struct vp702x_fe_state *st = fe->demodulator_priv;
220 	struct vp702x_device_state *dst = st->d->priv;
221 
222 	deb_fe("%s\n",__func__);
223 
224 	if (m->msg_len > 4)
225 		return -EINVAL;
226 
227 	mutex_lock(&dst->buf_mutex);
228 
229 	cmd = dst->buf;
230 	cmd[1] = SET_DISEQC_CMD;
231 	cmd[2] = m->msg_len;
232 	memcpy(&cmd[3], m->msg, m->msg_len);
233 	cmd[7] = vp702x_chksum(cmd, 0, 7);
234 
235 	vp702x_usb_inout_op(st->d, cmd, 8, cmd, 10, 100);
236 
237 	if (cmd[2] == 0 && cmd[3] == 0)
238 		deb_fe("diseqc cmd failed.\n");
239 	else
240 		deb_fe("diseqc cmd succeeded.\n");
241 
242 	mutex_unlock(&dst->buf_mutex);
243 
244 	return 0;
245 }
246 
247 static int vp702x_fe_send_diseqc_burst(struct dvb_frontend *fe,
248 				       enum fe_sec_mini_cmd burst)
249 {
250 	deb_fe("%s\n",__func__);
251 	return 0;
252 }
253 
254 static int vp702x_fe_set_tone(struct dvb_frontend *fe,
255 			      enum fe_sec_tone_mode tone)
256 {
257 	struct vp702x_fe_state *st = fe->demodulator_priv;
258 	struct vp702x_device_state *dst = st->d->priv;
259 	u8 *buf;
260 
261 	deb_fe("%s\n",__func__);
262 
263 	st->tone_mode = tone;
264 
265 	if (tone == SEC_TONE_ON)
266 		st->lnb_buf[2] = 0x02;
267 	else
268 		st->lnb_buf[2] = 0x00;
269 
270 	st->lnb_buf[7] = vp702x_chksum(st->lnb_buf, 0, 7);
271 
272 	mutex_lock(&dst->buf_mutex);
273 
274 	buf = dst->buf;
275 	memcpy(buf, st->lnb_buf, 8);
276 
277 	vp702x_usb_inout_op(st->d, buf, 8, buf, 10, 100);
278 	if (buf[2] == 0 && buf[3] == 0)
279 		deb_fe("set_tone cmd failed.\n");
280 	else
281 		deb_fe("set_tone cmd succeeded.\n");
282 
283 	mutex_unlock(&dst->buf_mutex);
284 
285 	return 0;
286 }
287 
288 static int vp702x_fe_set_voltage(struct dvb_frontend *fe,
289 				 enum fe_sec_voltage voltage)
290 {
291 	struct vp702x_fe_state *st = fe->demodulator_priv;
292 	struct vp702x_device_state *dst = st->d->priv;
293 	u8 *buf;
294 	deb_fe("%s\n",__func__);
295 
296 	st->voltage = voltage;
297 
298 	if (voltage != SEC_VOLTAGE_OFF)
299 		st->lnb_buf[4] = 0x01;
300 	else
301 		st->lnb_buf[4] = 0x00;
302 
303 	st->lnb_buf[7] = vp702x_chksum(st->lnb_buf, 0, 7);
304 
305 	mutex_lock(&dst->buf_mutex);
306 
307 	buf = dst->buf;
308 	memcpy(buf, st->lnb_buf, 8);
309 
310 	vp702x_usb_inout_op(st->d, buf, 8, buf, 10, 100);
311 	if (buf[2] == 0 && buf[3] == 0)
312 		deb_fe("set_voltage cmd failed.\n");
313 	else
314 		deb_fe("set_voltage cmd succeeded.\n");
315 
316 	mutex_unlock(&dst->buf_mutex);
317 	return 0;
318 }
319 
320 static void vp702x_fe_release(struct dvb_frontend* fe)
321 {
322 	struct vp702x_fe_state *st = fe->demodulator_priv;
323 	kfree(st);
324 }
325 
326 static const struct dvb_frontend_ops vp702x_fe_ops;
327 
328 struct dvb_frontend * vp702x_fe_attach(struct dvb_usb_device *d)
329 {
330 	struct vp702x_fe_state *s = kzalloc(sizeof(struct vp702x_fe_state), GFP_KERNEL);
331 	if (s == NULL)
332 		goto error;
333 
334 	s->d = d;
335 
336 	memcpy(&s->fe.ops,&vp702x_fe_ops,sizeof(struct dvb_frontend_ops));
337 	s->fe.demodulator_priv = s;
338 
339 	s->lnb_buf[1] = SET_LNB_POWER;
340 	s->lnb_buf[3] = 0xff; /* 0=tone burst, 2=data burst, ff=off */
341 
342 	return &s->fe;
343 error:
344 	return NULL;
345 }
346 
347 
348 static const struct dvb_frontend_ops vp702x_fe_ops = {
349 	.delsys = { SYS_DVBS },
350 	.info = {
351 		.name           = "Twinhan DST-like frontend (VP7021/VP7020) DVB-S",
352 		.frequency_min_hz       =  950 * MHz,
353 		.frequency_max_hz       = 2150 * MHz,
354 		.frequency_stepsize_hz  =    1 * MHz,
355 		.symbol_rate_min     = 1000000,
356 		.symbol_rate_max     = 45000000,
357 		.symbol_rate_tolerance = 500,  /* ppm */
358 		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
359 		FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
360 		FE_CAN_QPSK |
361 		FE_CAN_FEC_AUTO
362 	},
363 	.release = vp702x_fe_release,
364 
365 	.init  = vp702x_fe_init,
366 	.sleep = vp702x_fe_sleep,
367 
368 	.set_frontend = vp702x_fe_set_frontend,
369 	.get_tune_settings = vp702x_fe_get_tune_settings,
370 
371 	.read_status = vp702x_fe_read_status,
372 	.read_ber = vp702x_fe_read_ber,
373 	.read_signal_strength = vp702x_fe_read_signal_strength,
374 	.read_snr = vp702x_fe_read_snr,
375 	.read_ucblocks = vp702x_fe_read_unc_blocks,
376 
377 	.diseqc_send_master_cmd = vp702x_fe_send_diseqc_msg,
378 	.diseqc_send_burst = vp702x_fe_send_diseqc_burst,
379 	.set_tone = vp702x_fe_set_tone,
380 	.set_voltage = vp702x_fe_set_voltage,
381 };
382