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 	};
49 
50 	dev_dbg(&priv->i2c->dev, "%s: frequency=%d symbol_rate=%d\n", __func__,
51 			c->frequency, c->symbol_rate);
52 
53 	/* program tuner */
54 	if (fe->ops.tuner_ops.set_params)
55 		fe->ops.tuner_ops.set_params(fe);
56 
57 	if (priv->delivery_system !=  SYS_DVBC_ANNEX_A) {
58 		for (i = 0; i < ARRAY_SIZE(tab); i++) {
59 			ret = cxd2820r_wr_reg_mask(priv, tab[i].reg,
60 				tab[i].val, tab[i].mask);
61 			if (ret)
62 				goto error;
63 		}
64 	}
65 
66 	priv->delivery_system = SYS_DVBC_ANNEX_A;
67 	priv->ber_running = 0; /* tune stops BER counter */
68 
69 	/* program IF frequency */
70 	if (fe->ops.tuner_ops.get_if_frequency) {
71 		ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_freq);
72 		if (ret)
73 			goto error;
74 	} else
75 		if_freq = 0;
76 
77 	dev_dbg(&priv->i2c->dev, "%s: if_freq=%d\n", __func__, if_freq);
78 
79 	num = if_freq / 1000; /* Hz => kHz */
80 	num *= 0x4000;
81 	if_ctl = cxd2820r_div_u64_round_closest(num, 41000);
82 	buf[0] = (if_ctl >> 8) & 0x3f;
83 	buf[1] = (if_ctl >> 0) & 0xff;
84 
85 	ret = cxd2820r_wr_regs(priv, 0x10042, buf, 2);
86 	if (ret)
87 		goto error;
88 
89 	ret = cxd2820r_wr_reg(priv, 0x000ff, 0x08);
90 	if (ret)
91 		goto error;
92 
93 	ret = cxd2820r_wr_reg(priv, 0x000fe, 0x01);
94 	if (ret)
95 		goto error;
96 
97 	return ret;
98 error:
99 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
100 	return ret;
101 }
102 
103 int cxd2820r_get_frontend_c(struct dvb_frontend *fe)
104 {
105 	struct cxd2820r_priv *priv = fe->demodulator_priv;
106 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
107 	int ret;
108 	u8 buf[2];
109 
110 	ret = cxd2820r_rd_regs(priv, 0x1001a, buf, 2);
111 	if (ret)
112 		goto error;
113 
114 	c->symbol_rate = 2500 * ((buf[0] & 0x0f) << 8 | buf[1]);
115 
116 	ret = cxd2820r_rd_reg(priv, 0x10019, &buf[0]);
117 	if (ret)
118 		goto error;
119 
120 	switch ((buf[0] >> 0) & 0x07) {
121 	case 0:
122 		c->modulation = QAM_16;
123 		break;
124 	case 1:
125 		c->modulation = QAM_32;
126 		break;
127 	case 2:
128 		c->modulation = QAM_64;
129 		break;
130 	case 3:
131 		c->modulation = QAM_128;
132 		break;
133 	case 4:
134 		c->modulation = QAM_256;
135 		break;
136 	}
137 
138 	switch ((buf[0] >> 7) & 0x01) {
139 	case 0:
140 		c->inversion = INVERSION_OFF;
141 		break;
142 	case 1:
143 		c->inversion = INVERSION_ON;
144 		break;
145 	}
146 
147 	return ret;
148 error:
149 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
150 	return ret;
151 }
152 
153 int cxd2820r_read_ber_c(struct dvb_frontend *fe, u32 *ber)
154 {
155 	struct cxd2820r_priv *priv = fe->demodulator_priv;
156 	int ret;
157 	u8 buf[3], start_ber = 0;
158 	*ber = 0;
159 
160 	if (priv->ber_running) {
161 		ret = cxd2820r_rd_regs(priv, 0x10076, buf, sizeof(buf));
162 		if (ret)
163 			goto error;
164 
165 		if ((buf[2] >> 7) & 0x01 || (buf[2] >> 4) & 0x01) {
166 			*ber = (buf[2] & 0x0f) << 16 | buf[1] << 8 | buf[0];
167 			start_ber = 1;
168 		}
169 	} else {
170 		priv->ber_running = 1;
171 		start_ber = 1;
172 	}
173 
174 	if (start_ber) {
175 		/* (re)start BER */
176 		ret = cxd2820r_wr_reg(priv, 0x10079, 0x01);
177 		if (ret)
178 			goto error;
179 	}
180 
181 	return ret;
182 error:
183 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
184 	return ret;
185 }
186 
187 int cxd2820r_read_signal_strength_c(struct dvb_frontend *fe,
188 	u16 *strength)
189 {
190 	struct cxd2820r_priv *priv = fe->demodulator_priv;
191 	int ret;
192 	u8 buf[2];
193 	u16 tmp;
194 
195 	ret = cxd2820r_rd_regs(priv, 0x10049, buf, sizeof(buf));
196 	if (ret)
197 		goto error;
198 
199 	tmp = (buf[0] & 0x03) << 8 | buf[1];
200 	tmp = (~tmp & 0x03ff);
201 
202 	if (tmp == 512)
203 		/* ~no signal */
204 		tmp = 0;
205 	else if (tmp > 350)
206 		tmp = 350;
207 
208 	/* scale value to 0x0000-0xffff */
209 	*strength = tmp * 0xffff / (350-0);
210 
211 	return ret;
212 error:
213 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
214 	return ret;
215 }
216 
217 int cxd2820r_read_snr_c(struct dvb_frontend *fe, u16 *snr)
218 {
219 	struct cxd2820r_priv *priv = fe->demodulator_priv;
220 	int ret;
221 	u8 tmp;
222 	unsigned int A, B;
223 	/* report SNR in dB * 10 */
224 
225 	ret = cxd2820r_rd_reg(priv, 0x10019, &tmp);
226 	if (ret)
227 		goto error;
228 
229 	if (((tmp >> 0) & 0x03) % 2) {
230 		A = 875;
231 		B = 650;
232 	} else {
233 		A = 950;
234 		B = 760;
235 	}
236 
237 	ret = cxd2820r_rd_reg(priv, 0x1004d, &tmp);
238 	if (ret)
239 		goto error;
240 
241 	#define CXD2820R_LOG2_E_24 24204406 /* log2(e) << 24 */
242 	if (tmp)
243 		*snr = A * (intlog2(B / tmp) >> 5) / (CXD2820R_LOG2_E_24 >> 5)
244 			/ 10;
245 	else
246 		*snr = 0;
247 
248 	return ret;
249 error:
250 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
251 	return ret;
252 }
253 
254 int cxd2820r_read_ucblocks_c(struct dvb_frontend *fe, u32 *ucblocks)
255 {
256 	*ucblocks = 0;
257 	/* no way to read ? */
258 	return 0;
259 }
260 
261 int cxd2820r_read_status_c(struct dvb_frontend *fe, fe_status_t *status)
262 {
263 	struct cxd2820r_priv *priv = fe->demodulator_priv;
264 	int ret;
265 	u8 buf[2];
266 	*status = 0;
267 
268 	ret = cxd2820r_rd_regs(priv, 0x10088, buf, sizeof(buf));
269 	if (ret)
270 		goto error;
271 
272 	if (((buf[0] >> 0) & 0x01) == 1) {
273 		*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
274 			FE_HAS_VITERBI | FE_HAS_SYNC;
275 
276 		if (((buf[1] >> 3) & 0x01) == 1) {
277 			*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
278 				FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
279 		}
280 	}
281 
282 	dev_dbg(&priv->i2c->dev, "%s: lock=%02x %02x\n", __func__, buf[0],
283 			buf[1]);
284 
285 	return ret;
286 error:
287 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
288 	return ret;
289 }
290 
291 int cxd2820r_init_c(struct dvb_frontend *fe)
292 {
293 	struct cxd2820r_priv *priv = fe->demodulator_priv;
294 	int ret;
295 
296 	ret = cxd2820r_wr_reg(priv, 0x00085, 0x07);
297 	if (ret)
298 		goto error;
299 
300 	return ret;
301 error:
302 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
303 	return ret;
304 }
305 
306 int cxd2820r_sleep_c(struct dvb_frontend *fe)
307 {
308 	struct cxd2820r_priv *priv = fe->demodulator_priv;
309 	int ret, i;
310 	struct reg_val_mask tab[] = {
311 		{ 0x000ff, 0x1f, 0xff },
312 		{ 0x00085, 0x00, 0xff },
313 		{ 0x00088, 0x01, 0xff },
314 		{ 0x00081, 0x00, 0xff },
315 		{ 0x00080, 0x00, 0xff },
316 	};
317 
318 	dev_dbg(&priv->i2c->dev, "%s\n", __func__);
319 
320 	priv->delivery_system = SYS_UNDEFINED;
321 
322 	for (i = 0; i < ARRAY_SIZE(tab); i++) {
323 		ret = cxd2820r_wr_reg_mask(priv, tab[i].reg, tab[i].val,
324 			tab[i].mask);
325 		if (ret)
326 			goto error;
327 	}
328 
329 	return ret;
330 error:
331 	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
332 	return ret;
333 }
334 
335 int cxd2820r_get_tune_settings_c(struct dvb_frontend *fe,
336 	struct dvb_frontend_tune_settings *s)
337 {
338 	s->min_delay_ms = 500;
339 	s->step_size = 0; /* no zigzag */
340 	s->max_drift = 0;
341 
342 	return 0;
343 }
344