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
23struct 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
42static 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
66static 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
75static 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 */
94static 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 */
103static 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
111static 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
120static 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
131static 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
138static 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
200static 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
208static int vp702x_fe_sleep(struct dvb_frontend *fe)
209{
210	deb_fe("%s\n",__func__);
211	return 0;
212}
213
214static 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
246static 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
252static 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
285static 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
317static void vp702x_fe_release(struct dvb_frontend* fe)
318{
319	struct vp702x_fe_state *st = fe->demodulator_priv;
320	kfree(st);
321}
322
323static struct dvb_frontend_ops vp702x_fe_ops;
324
325struct 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;
340error:
341	return NULL;
342}
343
344
345static 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