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@desy.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/dvb/README.dvb-usb 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 	fe_sec_voltage_t voltage;
30 	fe_sec_tone_mode_t 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, fe_status_t *status)
76 {
77 	struct vp702x_fe_state *st = fe->demodulator_priv;
78 	vp702x_fe_refresh_state(st);
79 	deb_fe("%s\n",__func__);
80 
81 	if (st->lock == 0)
82 		*status = FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI | FE_HAS_SIGNAL | FE_HAS_CARRIER;
83 	else
84 		*status = 0;
85 
86 	if (*status & FE_HAS_LOCK)
87 		st->status_check_interval = 1000;
88 	else
89 		st->status_check_interval = 250;
90 	return 0;
91 }
92 
93 /* not supported by this Frontend */
94 static int vp702x_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
95 {
96 	struct vp702x_fe_state *st = fe->demodulator_priv;
97 	vp702x_fe_refresh_state(st);
98 	*ber = 0;
99 	return 0;
100 }
101 
102 /* not supported by this Frontend */
103 static int vp702x_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
104 {
105 	struct vp702x_fe_state *st = fe->demodulator_priv;
106 	vp702x_fe_refresh_state(st);
107 	*unc = 0;
108 	return 0;
109 }
110 
111 static int vp702x_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
112 {
113 	struct vp702x_fe_state *st = fe->demodulator_priv;
114 	vp702x_fe_refresh_state(st);
115 
116 	*strength = (st->sig << 8) | st->sig;
117 	return 0;
118 }
119 
120 static int vp702x_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
121 {
122 	u8 _snr;
123 	struct vp702x_fe_state *st = fe->demodulator_priv;
124 	vp702x_fe_refresh_state(st);
125 
126 	_snr = (st->snr & 0x1f) * 0xff / 0x1f;
127 	*snr = (_snr << 8) | _snr;
128 	return 0;
129 }
130 
131 static int vp702x_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
132 {
133 	deb_fe("%s\n",__func__);
134 	tune->min_delay_ms = 2000;
135 	return 0;
136 }
137 
138 static int vp702x_fe_set_frontend(struct dvb_frontend *fe)
139 {
140 	struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
141 	struct vp702x_fe_state *st = fe->demodulator_priv;
142 	struct vp702x_device_state *dst = st->d->priv;
143 	u32 freq = fep->frequency/1000;
144 	/*CalFrequency*/
145 /*	u16 frequencyRef[16] = { 2, 4, 8, 16, 32, 64, 128, 256, 24, 5, 10, 20, 40, 80, 160, 320 }; */
146 	u64 sr;
147 	u8 *cmd;
148 
149 	mutex_lock(&dst->buf_mutex);
150 
151 	cmd = dst->buf;
152 	memset(cmd, 0, 10);
153 
154 	cmd[0] = (freq >> 8) & 0x7f;
155 	cmd[1] =  freq       & 0xff;
156 	cmd[2] = 1; /* divrate == 4 -> frequencyRef[1] -> 1 here */
157 
158 	sr = (u64) (fep->symbol_rate/1000) << 20;
159 	do_div(sr,88000);
160 	cmd[3] = (sr >> 12) & 0xff;
161 	cmd[4] = (sr >> 4)  & 0xff;
162 	cmd[5] = (sr << 4)  & 0xf0;
163 
164 	deb_fe("setting frontend to: %u -> %u (%x) LNB-based GHz, symbolrate: %d -> %lu (%lx)\n",
165 			fep->frequency, freq, freq, fep->symbol_rate,
166 			(unsigned long) sr, (unsigned long) sr);
167 
168 /*	if (fep->inversion == INVERSION_ON)
169 		cmd[6] |= 0x80; */
170 
171 	if (st->voltage == SEC_VOLTAGE_18)
172 		cmd[6] |= 0x40;
173 
174 /*	if (fep->symbol_rate > 8000000)
175 		cmd[6] |= 0x20;
176 
177 	if (fep->frequency < 1531000)
178 		cmd[6] |= 0x04;
179 
180 	if (st->tone_mode == SEC_TONE_ON)
181 		cmd[6] |= 0x01;*/
182 
183 	cmd[7] = vp702x_chksum(cmd,0,7);
184 
185 	st->status_check_interval = 250;
186 	st->next_status_check = jiffies;
187 
188 	vp702x_usb_inout_op(st->d, cmd, 8, cmd, 10, 100);
189 
190 	if (cmd[2] == 0 && cmd[3] == 0)
191 		deb_fe("tuning failed.\n");
192 	else
193 		deb_fe("tuning succeeded.\n");
194 
195 	mutex_unlock(&dst->buf_mutex);
196 
197 	return 0;
198 }
199 
200 static int vp702x_fe_init(struct dvb_frontend *fe)
201 {
202 	struct vp702x_fe_state *st = fe->demodulator_priv;
203 	deb_fe("%s\n",__func__);
204 	vp702x_usb_in_op(st->d, RESET_TUNER, 0, 0, NULL, 0);
205 	return 0;
206 }
207 
208 static int vp702x_fe_sleep(struct dvb_frontend *fe)
209 {
210 	deb_fe("%s\n",__func__);
211 	return 0;
212 }
213 
214 static int vp702x_fe_send_diseqc_msg (struct dvb_frontend* fe,
215 				    struct dvb_diseqc_master_cmd *m)
216 {
217 	u8 *cmd;
218 	struct vp702x_fe_state *st = fe->demodulator_priv;
219 	struct vp702x_device_state *dst = st->d->priv;
220 
221 	deb_fe("%s\n",__func__);
222 
223 	if (m->msg_len > 4)
224 		return -EINVAL;
225 
226 	mutex_lock(&dst->buf_mutex);
227 
228 	cmd = dst->buf;
229 	cmd[1] = SET_DISEQC_CMD;
230 	cmd[2] = m->msg_len;
231 	memcpy(&cmd[3], m->msg, m->msg_len);
232 	cmd[7] = vp702x_chksum(cmd, 0, 7);
233 
234 	vp702x_usb_inout_op(st->d, cmd, 8, cmd, 10, 100);
235 
236 	if (cmd[2] == 0 && cmd[3] == 0)
237 		deb_fe("diseqc cmd failed.\n");
238 	else
239 		deb_fe("diseqc cmd succeeded.\n");
240 
241 	mutex_unlock(&dst->buf_mutex);
242 
243 	return 0;
244 }
245 
246 static int vp702x_fe_send_diseqc_burst (struct dvb_frontend* fe, fe_sec_mini_cmd_t burst)
247 {
248 	deb_fe("%s\n",__func__);
249 	return 0;
250 }
251 
252 static int vp702x_fe_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
253 {
254 	struct vp702x_fe_state *st = fe->demodulator_priv;
255 	struct vp702x_device_state *dst = st->d->priv;
256 	u8 *buf;
257 
258 	deb_fe("%s\n",__func__);
259 
260 	st->tone_mode = tone;
261 
262 	if (tone == SEC_TONE_ON)
263 		st->lnb_buf[2] = 0x02;
264 	else
265 		st->lnb_buf[2] = 0x00;
266 
267 	st->lnb_buf[7] = vp702x_chksum(st->lnb_buf, 0, 7);
268 
269 	mutex_lock(&dst->buf_mutex);
270 
271 	buf = dst->buf;
272 	memcpy(buf, st->lnb_buf, 8);
273 
274 	vp702x_usb_inout_op(st->d, buf, 8, buf, 10, 100);
275 	if (buf[2] == 0 && buf[3] == 0)
276 		deb_fe("set_tone cmd failed.\n");
277 	else
278 		deb_fe("set_tone cmd succeeded.\n");
279 
280 	mutex_unlock(&dst->buf_mutex);
281 
282 	return 0;
283 }
284 
285 static int vp702x_fe_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t
286 		voltage)
287 {
288 	struct vp702x_fe_state *st = fe->demodulator_priv;
289 	struct vp702x_device_state *dst = st->d->priv;
290 	u8 *buf;
291 	deb_fe("%s\n",__func__);
292 
293 	st->voltage = voltage;
294 
295 	if (voltage != SEC_VOLTAGE_OFF)
296 		st->lnb_buf[4] = 0x01;
297 	else
298 		st->lnb_buf[4] = 0x00;
299 
300 	st->lnb_buf[7] = vp702x_chksum(st->lnb_buf, 0, 7);
301 
302 	mutex_lock(&dst->buf_mutex);
303 
304 	buf = dst->buf;
305 	memcpy(buf, st->lnb_buf, 8);
306 
307 	vp702x_usb_inout_op(st->d, buf, 8, buf, 10, 100);
308 	if (buf[2] == 0 && buf[3] == 0)
309 		deb_fe("set_voltage cmd failed.\n");
310 	else
311 		deb_fe("set_voltage cmd succeeded.\n");
312 
313 	mutex_unlock(&dst->buf_mutex);
314 	return 0;
315 }
316 
317 static void vp702x_fe_release(struct dvb_frontend* fe)
318 {
319 	struct vp702x_fe_state *st = fe->demodulator_priv;
320 	kfree(st);
321 }
322 
323 static struct dvb_frontend_ops vp702x_fe_ops;
324 
325 struct dvb_frontend * vp702x_fe_attach(struct dvb_usb_device *d)
326 {
327 	struct vp702x_fe_state *s = kzalloc(sizeof(struct vp702x_fe_state), GFP_KERNEL);
328 	if (s == NULL)
329 		goto error;
330 
331 	s->d = d;
332 
333 	memcpy(&s->fe.ops,&vp702x_fe_ops,sizeof(struct dvb_frontend_ops));
334 	s->fe.demodulator_priv = s;
335 
336 	s->lnb_buf[1] = SET_LNB_POWER;
337 	s->lnb_buf[3] = 0xff; /* 0=tone burst, 2=data burst, ff=off */
338 
339 	return &s->fe;
340 error:
341 	return NULL;
342 }
343 
344 
345 static struct dvb_frontend_ops vp702x_fe_ops = {
346 	.delsys = { SYS_DVBS },
347 	.info = {
348 		.name           = "Twinhan DST-like frontend (VP7021/VP7020) DVB-S",
349 		.frequency_min       = 950000,
350 		.frequency_max       = 2150000,
351 		.frequency_stepsize  = 1000,   /* kHz for QPSK frontends */
352 		.frequency_tolerance = 0,
353 		.symbol_rate_min     = 1000000,
354 		.symbol_rate_max     = 45000000,
355 		.symbol_rate_tolerance = 500,  /* ppm */
356 		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
357 		FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
358 		FE_CAN_QPSK |
359 		FE_CAN_FEC_AUTO
360 	},
361 	.release = vp702x_fe_release,
362 
363 	.init  = vp702x_fe_init,
364 	.sleep = vp702x_fe_sleep,
365 
366 	.set_frontend = vp702x_fe_set_frontend,
367 	.get_tune_settings = vp702x_fe_get_tune_settings,
368 
369 	.read_status = vp702x_fe_read_status,
370 	.read_ber = vp702x_fe_read_ber,
371 	.read_signal_strength = vp702x_fe_read_signal_strength,
372 	.read_snr = vp702x_fe_read_snr,
373 	.read_ucblocks = vp702x_fe_read_unc_blocks,
374 
375 	.diseqc_send_master_cmd = vp702x_fe_send_diseqc_msg,
376 	.diseqc_send_burst = vp702x_fe_send_diseqc_burst,
377 	.set_tone = vp702x_fe_set_tone,
378 	.set_voltage = vp702x_fe_set_voltage,
379 };
380