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 
24 int 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 - cxd2820r_div_u64_round_closest(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;
99 error:
100 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
101 	return ret;
102 }
103 
104 int 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;
149 error:
150 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
151 	return ret;
152 }
153 
154 int 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;
183 error:
184 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
185 	return ret;
186 }
187 
188 int 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;
213 error:
214 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
215 	return ret;
216 }
217 
218 int 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;
250 error:
251 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
252 	return ret;
253 }
254 
255 int cxd2820r_read_ucblocks_c(struct dvb_frontend *fe, u32 *ucblocks)
256 {
257 	*ucblocks = 0;
258 	/* no way to read ? */
259 	return 0;
260 }
261 
262 int 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;
287 error:
288 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
289 	return ret;
290 }
291 
292 int 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;
302 error:
303 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
304 	return ret;
305 }
306 
307 int 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;
331 error:
332 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
333 	return ret;
334 }
335 
336 int 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