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		{ 0x10071, !priv->cfg.ts_clock_inv << 4, 0x10 },
49	};
50
51	dev_dbg(&priv->i2c->dev, "%s: frequency=%d symbol_rate=%d\n", __func__,
52			c->frequency, c->symbol_rate);
53
54	/* program tuner */
55	if (fe->ops.tuner_ops.set_params)
56		fe->ops.tuner_ops.set_params(fe);
57
58	if (priv->delivery_system !=  SYS_DVBC_ANNEX_A) {
59		for (i = 0; i < ARRAY_SIZE(tab); i++) {
60			ret = cxd2820r_wr_reg_mask(priv, tab[i].reg,
61				tab[i].val, tab[i].mask);
62			if (ret)
63				goto error;
64		}
65	}
66
67	priv->delivery_system = SYS_DVBC_ANNEX_A;
68	priv->ber_running = false; /* tune stops BER counter */
69
70	/* program IF frequency */
71	if (fe->ops.tuner_ops.get_if_frequency) {
72		ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_freq);
73		if (ret)
74			goto error;
75	} else
76		if_freq = 0;
77
78	dev_dbg(&priv->i2c->dev, "%s: if_freq=%d\n", __func__, if_freq);
79
80	num = if_freq / 1000; /* Hz => kHz */
81	num *= 0x4000;
82	if_ctl = 0x4000 - DIV_ROUND_CLOSEST_ULL(num, 41000);
83	buf[0] = (if_ctl >> 8) & 0x3f;
84	buf[1] = (if_ctl >> 0) & 0xff;
85
86	ret = cxd2820r_wr_regs(priv, 0x10042, buf, 2);
87	if (ret)
88		goto error;
89
90	ret = cxd2820r_wr_reg(priv, 0x000ff, 0x08);
91	if (ret)
92		goto error;
93
94	ret = cxd2820r_wr_reg(priv, 0x000fe, 0x01);
95	if (ret)
96		goto error;
97
98	return ret;
99error:
100	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
101	return ret;
102}
103
104int cxd2820r_get_frontend_c(struct dvb_frontend *fe)
105{
106	struct cxd2820r_priv *priv = fe->demodulator_priv;
107	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
108	int ret;
109	u8 buf[2];
110
111	ret = cxd2820r_rd_regs(priv, 0x1001a, buf, 2);
112	if (ret)
113		goto error;
114
115	c->symbol_rate = 2500 * ((buf[0] & 0x0f) << 8 | buf[1]);
116
117	ret = cxd2820r_rd_reg(priv, 0x10019, &buf[0]);
118	if (ret)
119		goto error;
120
121	switch ((buf[0] >> 0) & 0x07) {
122	case 0:
123		c->modulation = QAM_16;
124		break;
125	case 1:
126		c->modulation = QAM_32;
127		break;
128	case 2:
129		c->modulation = QAM_64;
130		break;
131	case 3:
132		c->modulation = QAM_128;
133		break;
134	case 4:
135		c->modulation = QAM_256;
136		break;
137	}
138
139	switch ((buf[0] >> 7) & 0x01) {
140	case 0:
141		c->inversion = INVERSION_OFF;
142		break;
143	case 1:
144		c->inversion = INVERSION_ON;
145		break;
146	}
147
148	return ret;
149error:
150	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
151	return ret;
152}
153
154int cxd2820r_read_ber_c(struct dvb_frontend *fe, u32 *ber)
155{
156	struct cxd2820r_priv *priv = fe->demodulator_priv;
157	int ret;
158	u8 buf[3], start_ber = 0;
159	*ber = 0;
160
161	if (priv->ber_running) {
162		ret = cxd2820r_rd_regs(priv, 0x10076, buf, sizeof(buf));
163		if (ret)
164			goto error;
165
166		if ((buf[2] >> 7) & 0x01 || (buf[2] >> 4) & 0x01) {
167			*ber = (buf[2] & 0x0f) << 16 | buf[1] << 8 | buf[0];
168			start_ber = 1;
169		}
170	} else {
171		priv->ber_running = true;
172		start_ber = 1;
173	}
174
175	if (start_ber) {
176		/* (re)start BER */
177		ret = cxd2820r_wr_reg(priv, 0x10079, 0x01);
178		if (ret)
179			goto error;
180	}
181
182	return ret;
183error:
184	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
185	return ret;
186}
187
188int cxd2820r_read_signal_strength_c(struct dvb_frontend *fe,
189	u16 *strength)
190{
191	struct cxd2820r_priv *priv = fe->demodulator_priv;
192	int ret;
193	u8 buf[2];
194	u16 tmp;
195
196	ret = cxd2820r_rd_regs(priv, 0x10049, buf, sizeof(buf));
197	if (ret)
198		goto error;
199
200	tmp = (buf[0] & 0x03) << 8 | buf[1];
201	tmp = (~tmp & 0x03ff);
202
203	if (tmp == 512)
204		/* ~no signal */
205		tmp = 0;
206	else if (tmp > 350)
207		tmp = 350;
208
209	/* scale value to 0x0000-0xffff */
210	*strength = tmp * 0xffff / (350-0);
211
212	return ret;
213error:
214	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
215	return ret;
216}
217
218int cxd2820r_read_snr_c(struct dvb_frontend *fe, u16 *snr)
219{
220	struct cxd2820r_priv *priv = fe->demodulator_priv;
221	int ret;
222	u8 tmp;
223	unsigned int A, B;
224	/* report SNR in dB * 10 */
225
226	ret = cxd2820r_rd_reg(priv, 0x10019, &tmp);
227	if (ret)
228		goto error;
229
230	if (((tmp >> 0) & 0x03) % 2) {
231		A = 875;
232		B = 650;
233	} else {
234		A = 950;
235		B = 760;
236	}
237
238	ret = cxd2820r_rd_reg(priv, 0x1004d, &tmp);
239	if (ret)
240		goto error;
241
242	#define CXD2820R_LOG2_E_24 24204406 /* log2(e) << 24 */
243	if (tmp)
244		*snr = A * (intlog2(B / tmp) >> 5) / (CXD2820R_LOG2_E_24 >> 5)
245			/ 10;
246	else
247		*snr = 0;
248
249	return ret;
250error:
251	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
252	return ret;
253}
254
255int cxd2820r_read_ucblocks_c(struct dvb_frontend *fe, u32 *ucblocks)
256{
257	*ucblocks = 0;
258	/* no way to read ? */
259	return 0;
260}
261
262int cxd2820r_read_status_c(struct dvb_frontend *fe, fe_status_t *status)
263{
264	struct cxd2820r_priv *priv = fe->demodulator_priv;
265	int ret;
266	u8 buf[2];
267	*status = 0;
268
269	ret = cxd2820r_rd_regs(priv, 0x10088, buf, sizeof(buf));
270	if (ret)
271		goto error;
272
273	if (((buf[0] >> 0) & 0x01) == 1) {
274		*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
275			FE_HAS_VITERBI | FE_HAS_SYNC;
276
277		if (((buf[1] >> 3) & 0x01) == 1) {
278			*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
279				FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
280		}
281	}
282
283	dev_dbg(&priv->i2c->dev, "%s: lock=%02x %02x\n", __func__, buf[0],
284			buf[1]);
285
286	return ret;
287error:
288	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
289	return ret;
290}
291
292int cxd2820r_init_c(struct dvb_frontend *fe)
293{
294	struct cxd2820r_priv *priv = fe->demodulator_priv;
295	int ret;
296
297	ret = cxd2820r_wr_reg(priv, 0x00085, 0x07);
298	if (ret)
299		goto error;
300
301	return ret;
302error:
303	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
304	return ret;
305}
306
307int cxd2820r_sleep_c(struct dvb_frontend *fe)
308{
309	struct cxd2820r_priv *priv = fe->demodulator_priv;
310	int ret, i;
311	struct reg_val_mask tab[] = {
312		{ 0x000ff, 0x1f, 0xff },
313		{ 0x00085, 0x00, 0xff },
314		{ 0x00088, 0x01, 0xff },
315		{ 0x00081, 0x00, 0xff },
316		{ 0x00080, 0x00, 0xff },
317	};
318
319	dev_dbg(&priv->i2c->dev, "%s\n", __func__);
320
321	priv->delivery_system = SYS_UNDEFINED;
322
323	for (i = 0; i < ARRAY_SIZE(tab); i++) {
324		ret = cxd2820r_wr_reg_mask(priv, tab[i].reg, tab[i].val,
325			tab[i].mask);
326		if (ret)
327			goto error;
328	}
329
330	return ret;
331error:
332	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
333	return ret;
334}
335
336int cxd2820r_get_tune_settings_c(struct dvb_frontend *fe,
337	struct dvb_frontend_tune_settings *s)
338{
339	s->min_delay_ms = 500;
340	s->step_size = 0; /* no zigzag */
341	s->max_drift = 0;
342
343	return 0;
344}
345