1/*
2 * Sony CXD2820R demodulator driver
3 *
4 * Copyright (C) 2010 Antti Palosaari <crope@iki.fi>
5 *
6 *    This program is free software; you can redistribute it and/or modify
7 *    it under the terms of the GNU General Public License as published by
8 *    the Free Software Foundation; either version 2 of the License, or
9 *    (at your option) any later version.
10 *
11 *    This program is distributed in the hope that it will be useful,
12 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *    GNU General Public License for more details.
15 *
16 *    You should have received a copy of the GNU General Public License along
17 *    with this program; if not, write to the Free Software Foundation, Inc.,
18 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21
22#include "cxd2820r_priv.h"
23
24int cxd2820r_set_frontend_c(struct dvb_frontend *fe)
25{
26	struct cxd2820r_priv *priv = fe->demodulator_priv;
27	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
28	int ret, i;
29	u8 buf[2];
30	u32 if_freq;
31	u16 if_ctl;
32	u64 num;
33	struct reg_val_mask tab[] = {
34		{ 0x00080, 0x01, 0xff },
35		{ 0x00081, 0x05, 0xff },
36		{ 0x00085, 0x07, 0xff },
37		{ 0x00088, 0x01, 0xff },
38
39		{ 0x00082, 0x20, 0x60 },
40		{ 0x1016a, 0x48, 0xff },
41		{ 0x100a5, 0x00, 0x01 },
42		{ 0x10020, 0x06, 0x07 },
43		{ 0x10059, 0x50, 0xff },
44		{ 0x10087, 0x0c, 0x3c },
45		{ 0x1008b, 0x07, 0xff },
46		{ 0x1001f, priv->cfg.if_agc_polarity << 7, 0x80 },
47		{ 0x10070, priv->cfg.ts_mode, 0xff },
48	};
49
50	dbg("%s: RF=%d SR=%d", __func__, c->frequency, c->symbol_rate);
51
52	/* update GPIOs */
53	ret = cxd2820r_gpio(fe);
54	if (ret)
55		goto error;
56
57	/* program tuner */
58	if (fe->ops.tuner_ops.set_params)
59		fe->ops.tuner_ops.set_params(fe);
60
61	if (priv->delivery_system !=  SYS_DVBC_ANNEX_A) {
62		for (i = 0; i < ARRAY_SIZE(tab); i++) {
63			ret = cxd2820r_wr_reg_mask(priv, tab[i].reg,
64				tab[i].val, tab[i].mask);
65			if (ret)
66				goto error;
67		}
68	}
69
70	priv->delivery_system = SYS_DVBC_ANNEX_A;
71	priv->ber_running = 0; /* tune stops BER counter */
72
73	/* program IF frequency */
74	if (fe->ops.tuner_ops.get_if_frequency) {
75		ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_freq);
76		if (ret)
77			goto error;
78	} else
79		if_freq = 0;
80
81	dbg("%s: if_freq=%d", __func__, if_freq);
82
83	num = if_freq / 1000; /* Hz => kHz */
84	num *= 0x4000;
85	if_ctl = cxd2820r_div_u64_round_closest(num, 41000);
86	buf[0] = (if_ctl >> 8) & 0x3f;
87	buf[1] = (if_ctl >> 0) & 0xff;
88
89	ret = cxd2820r_wr_regs(priv, 0x10042, buf, 2);
90	if (ret)
91		goto error;
92
93	ret = cxd2820r_wr_reg(priv, 0x000ff, 0x08);
94	if (ret)
95		goto error;
96
97	ret = cxd2820r_wr_reg(priv, 0x000fe, 0x01);
98	if (ret)
99		goto error;
100
101	return ret;
102error:
103	dbg("%s: failed:%d", __func__, ret);
104	return ret;
105}
106
107int cxd2820r_get_frontend_c(struct dvb_frontend *fe)
108{
109	struct cxd2820r_priv *priv = fe->demodulator_priv;
110	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
111	int ret;
112	u8 buf[2];
113
114	ret = cxd2820r_rd_regs(priv, 0x1001a, buf, 2);
115	if (ret)
116		goto error;
117
118	c->symbol_rate = 2500 * ((buf[0] & 0x0f) << 8 | buf[1]);
119
120	ret = cxd2820r_rd_reg(priv, 0x10019, &buf[0]);
121	if (ret)
122		goto error;
123
124	switch ((buf[0] >> 0) & 0x03) {
125	case 0:
126		c->modulation = QAM_16;
127		break;
128	case 1:
129		c->modulation = QAM_32;
130		break;
131	case 2:
132		c->modulation = QAM_64;
133		break;
134	case 3:
135		c->modulation = QAM_128;
136		break;
137	case 4:
138		c->modulation = QAM_256;
139		break;
140	}
141
142	switch ((buf[0] >> 7) & 0x01) {
143	case 0:
144		c->inversion = INVERSION_OFF;
145		break;
146	case 1:
147		c->inversion = INVERSION_ON;
148		break;
149	}
150
151	return ret;
152error:
153	dbg("%s: failed:%d", __func__, ret);
154	return ret;
155}
156
157int cxd2820r_read_ber_c(struct dvb_frontend *fe, u32 *ber)
158{
159	struct cxd2820r_priv *priv = fe->demodulator_priv;
160	int ret;
161	u8 buf[3], start_ber = 0;
162	*ber = 0;
163
164	if (priv->ber_running) {
165		ret = cxd2820r_rd_regs(priv, 0x10076, buf, sizeof(buf));
166		if (ret)
167			goto error;
168
169		if ((buf[2] >> 7) & 0x01 || (buf[2] >> 4) & 0x01) {
170			*ber = (buf[2] & 0x0f) << 16 | buf[1] << 8 | buf[0];
171			start_ber = 1;
172		}
173	} else {
174		priv->ber_running = 1;
175		start_ber = 1;
176	}
177
178	if (start_ber) {
179		/* (re)start BER */
180		ret = cxd2820r_wr_reg(priv, 0x10079, 0x01);
181		if (ret)
182			goto error;
183	}
184
185	return ret;
186error:
187	dbg("%s: failed:%d", __func__, ret);
188	return ret;
189}
190
191int cxd2820r_read_signal_strength_c(struct dvb_frontend *fe,
192	u16 *strength)
193{
194	struct cxd2820r_priv *priv = fe->demodulator_priv;
195	int ret;
196	u8 buf[2];
197	u16 tmp;
198
199	ret = cxd2820r_rd_regs(priv, 0x10049, buf, sizeof(buf));
200	if (ret)
201		goto error;
202
203	tmp = (buf[0] & 0x03) << 8 | buf[1];
204	tmp = (~tmp & 0x03ff);
205
206	if (tmp == 512)
207		/* ~no signal */
208		tmp = 0;
209	else if (tmp > 350)
210		tmp = 350;
211
212	/* scale value to 0x0000-0xffff */
213	*strength = tmp * 0xffff / (350-0);
214
215	return ret;
216error:
217	dbg("%s: failed:%d", __func__, ret);
218	return ret;
219}
220
221int cxd2820r_read_snr_c(struct dvb_frontend *fe, u16 *snr)
222{
223	struct cxd2820r_priv *priv = fe->demodulator_priv;
224	int ret;
225	u8 tmp;
226	unsigned int A, B;
227	/* report SNR in dB * 10 */
228
229	ret = cxd2820r_rd_reg(priv, 0x10019, &tmp);
230	if (ret)
231		goto error;
232
233	if (((tmp >> 0) & 0x03) % 2) {
234		A = 875;
235		B = 650;
236	} else {
237		A = 950;
238		B = 760;
239	}
240
241	ret = cxd2820r_rd_reg(priv, 0x1004d, &tmp);
242	if (ret)
243		goto error;
244
245	#define CXD2820R_LOG2_E_24 24204406 /* log2(e) << 24 */
246	if (tmp)
247		*snr = A * (intlog2(B / tmp) >> 5) / (CXD2820R_LOG2_E_24 >> 5)
248			/ 10;
249	else
250		*snr = 0;
251
252	return ret;
253error:
254	dbg("%s: failed:%d", __func__, ret);
255	return ret;
256}
257
258int cxd2820r_read_ucblocks_c(struct dvb_frontend *fe, u32 *ucblocks)
259{
260	*ucblocks = 0;
261	/* no way to read ? */
262	return 0;
263}
264
265int cxd2820r_read_status_c(struct dvb_frontend *fe, fe_status_t *status)
266{
267	struct cxd2820r_priv *priv = fe->demodulator_priv;
268	int ret;
269	u8 buf[2];
270	*status = 0;
271
272	ret = cxd2820r_rd_regs(priv, 0x10088, buf, sizeof(buf));
273	if (ret)
274		goto error;
275
276	if (((buf[0] >> 0) & 0x01) == 1) {
277		*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
278			FE_HAS_VITERBI | FE_HAS_SYNC;
279
280		if (((buf[1] >> 3) & 0x01) == 1) {
281			*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
282				FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
283		}
284	}
285
286	dbg("%s: lock=%02x %02x", __func__, buf[0], buf[1]);
287
288	return ret;
289error:
290	dbg("%s: failed:%d", __func__, ret);
291	return ret;
292}
293
294int cxd2820r_init_c(struct dvb_frontend *fe)
295{
296	struct cxd2820r_priv *priv = fe->demodulator_priv;
297	int ret;
298
299	ret = cxd2820r_wr_reg(priv, 0x00085, 0x07);
300	if (ret)
301		goto error;
302
303	return ret;
304error:
305	dbg("%s: failed:%d", __func__, ret);
306	return ret;
307}
308
309int cxd2820r_sleep_c(struct dvb_frontend *fe)
310{
311	struct cxd2820r_priv *priv = fe->demodulator_priv;
312	int ret, i;
313	struct reg_val_mask tab[] = {
314		{ 0x000ff, 0x1f, 0xff },
315		{ 0x00085, 0x00, 0xff },
316		{ 0x00088, 0x01, 0xff },
317		{ 0x00081, 0x00, 0xff },
318		{ 0x00080, 0x00, 0xff },
319	};
320
321	dbg("%s", __func__);
322
323	priv->delivery_system = SYS_UNDEFINED;
324
325	for (i = 0; i < ARRAY_SIZE(tab); i++) {
326		ret = cxd2820r_wr_reg_mask(priv, tab[i].reg, tab[i].val,
327			tab[i].mask);
328		if (ret)
329			goto error;
330	}
331
332	return ret;
333error:
334	dbg("%s: failed:%d", __func__, ret);
335	return ret;
336}
337
338int cxd2820r_get_tune_settings_c(struct dvb_frontend *fe,
339	struct dvb_frontend_tune_settings *s)
340{
341	s->min_delay_ms = 500;
342	s->step_size = 0; /* no zigzag */
343	s->max_drift = 0;
344
345	return 0;
346}
347