1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Sony CXD2820R demodulator driver
4  *
5  * Copyright (C) 2010 Antti Palosaari <crope@iki.fi>
6  */
7 
8 
9 #include "cxd2820r_priv.h"
10 
11 int cxd2820r_set_frontend_c(struct dvb_frontend *fe)
12 {
13 	struct cxd2820r_priv *priv = fe->demodulator_priv;
14 	struct i2c_client *client = priv->client[0];
15 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
16 	int ret;
17 	unsigned int utmp;
18 	u8 buf[2];
19 	u32 if_frequency;
20 	struct reg_val_mask tab[] = {
21 		{ 0x00080, 0x01, 0xff },
22 		{ 0x00081, 0x05, 0xff },
23 		{ 0x00085, 0x07, 0xff },
24 		{ 0x00088, 0x01, 0xff },
25 
26 		{ 0x00082, 0x20, 0x60 },
27 		{ 0x1016a, 0x48, 0xff },
28 		{ 0x100a5, 0x00, 0x01 },
29 		{ 0x10020, 0x06, 0x07 },
30 		{ 0x10059, 0x50, 0xff },
31 		{ 0x10087, 0x0c, 0x3c },
32 		{ 0x1008b, 0x07, 0xff },
33 		{ 0x1001f, priv->if_agc_polarity << 7, 0x80 },
34 		{ 0x10070, priv->ts_mode, 0xff },
35 		{ 0x10071, !priv->ts_clk_inv << 4, 0x10 },
36 	};
37 
38 	dev_dbg(&client->dev,
39 		"delivery_system=%d modulation=%d frequency=%u symbol_rate=%u inversion=%d\n",
40 		c->delivery_system, c->modulation, c->frequency,
41 		c->symbol_rate, c->inversion);
42 
43 	/* program tuner */
44 	if (fe->ops.tuner_ops.set_params)
45 		fe->ops.tuner_ops.set_params(fe);
46 
47 	if (priv->delivery_system !=  SYS_DVBC_ANNEX_A) {
48 		ret = cxd2820r_wr_reg_val_mask_tab(priv, tab, ARRAY_SIZE(tab));
49 		if (ret)
50 			goto error;
51 	}
52 
53 	priv->delivery_system = SYS_DVBC_ANNEX_A;
54 	priv->ber_running = false; /* tune stops BER counter */
55 
56 	/* program IF frequency */
57 	if (fe->ops.tuner_ops.get_if_frequency) {
58 		ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_frequency);
59 		if (ret)
60 			goto error;
61 		dev_dbg(&client->dev, "if_frequency=%u\n", if_frequency);
62 	} else {
63 		ret = -EINVAL;
64 		goto error;
65 	}
66 
67 	utmp = 0x4000 - DIV_ROUND_CLOSEST_ULL((u64)if_frequency * 0x4000, CXD2820R_CLK);
68 	buf[0] = (utmp >> 8) & 0xff;
69 	buf[1] = (utmp >> 0) & 0xff;
70 	ret = regmap_bulk_write(priv->regmap[1], 0x0042, buf, 2);
71 	if (ret)
72 		goto error;
73 
74 	ret = regmap_write(priv->regmap[0], 0x00ff, 0x08);
75 	if (ret)
76 		goto error;
77 
78 	ret = regmap_write(priv->regmap[0], 0x00fe, 0x01);
79 	if (ret)
80 		goto error;
81 
82 	return ret;
83 error:
84 	dev_dbg(&client->dev, "failed=%d\n", ret);
85 	return ret;
86 }
87 
88 int cxd2820r_get_frontend_c(struct dvb_frontend *fe,
89 			    struct dtv_frontend_properties *c)
90 {
91 	struct cxd2820r_priv *priv = fe->demodulator_priv;
92 	struct i2c_client *client = priv->client[0];
93 	int ret;
94 	unsigned int utmp;
95 	u8 buf[2];
96 
97 	dev_dbg(&client->dev, "\n");
98 
99 	ret = regmap_bulk_read(priv->regmap[1], 0x001a, buf, 2);
100 	if (ret)
101 		goto error;
102 
103 	c->symbol_rate = 2500 * ((buf[0] & 0x0f) << 8 | buf[1]);
104 
105 	ret = regmap_read(priv->regmap[1], 0x0019, &utmp);
106 	if (ret)
107 		goto error;
108 
109 	switch ((utmp >> 0) & 0x07) {
110 	case 0:
111 		c->modulation = QAM_16;
112 		break;
113 	case 1:
114 		c->modulation = QAM_32;
115 		break;
116 	case 2:
117 		c->modulation = QAM_64;
118 		break;
119 	case 3:
120 		c->modulation = QAM_128;
121 		break;
122 	case 4:
123 		c->modulation = QAM_256;
124 		break;
125 	}
126 
127 	switch ((utmp >> 7) & 0x01) {
128 	case 0:
129 		c->inversion = INVERSION_OFF;
130 		break;
131 	case 1:
132 		c->inversion = INVERSION_ON;
133 		break;
134 	}
135 
136 	return ret;
137 error:
138 	dev_dbg(&client->dev, "failed=%d\n", ret);
139 	return ret;
140 }
141 
142 int cxd2820r_read_status_c(struct dvb_frontend *fe, enum fe_status *status)
143 {
144 	struct cxd2820r_priv *priv = fe->demodulator_priv;
145 	struct i2c_client *client = priv->client[0];
146 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
147 	int ret;
148 	unsigned int utmp, utmp1, utmp2;
149 	u8 buf[3];
150 
151 	/* Lock detection */
152 	ret = regmap_bulk_read(priv->regmap[1], 0x0088, &buf[0], 1);
153 	if (ret)
154 		goto error;
155 	ret = regmap_bulk_read(priv->regmap[1], 0x0073, &buf[1], 1);
156 	if (ret)
157 		goto error;
158 
159 	utmp1 = (buf[0] >> 0) & 0x01;
160 	utmp2 = (buf[1] >> 3) & 0x01;
161 
162 	if (utmp1 == 1 && utmp2 == 1) {
163 		*status = FE_HAS_SIGNAL | FE_HAS_CARRIER |
164 			  FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
165 	} else if (utmp1 == 1 || utmp2 == 1) {
166 		*status = FE_HAS_SIGNAL | FE_HAS_CARRIER |
167 			  FE_HAS_VITERBI | FE_HAS_SYNC;
168 	} else {
169 		*status = 0;
170 	}
171 
172 	dev_dbg(&client->dev, "status=%02x raw=%*ph sync=%u ts=%u\n",
173 		*status, 2, buf, utmp1, utmp2);
174 
175 	/* Signal strength */
176 	if (*status & FE_HAS_SIGNAL) {
177 		unsigned int strength;
178 
179 		ret = regmap_bulk_read(priv->regmap[1], 0x0049, buf, 2);
180 		if (ret)
181 			goto error;
182 
183 		utmp = buf[0] << 8 | buf[1] << 0;
184 		utmp = 511 - sign_extend32(utmp, 9);
185 		/* Scale value to 0x0000-0xffff */
186 		strength = utmp << 6 | utmp >> 4;
187 
188 		c->strength.len = 1;
189 		c->strength.stat[0].scale = FE_SCALE_RELATIVE;
190 		c->strength.stat[0].uvalue = strength;
191 	} else {
192 		c->strength.len = 1;
193 		c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
194 	}
195 
196 	/* CNR */
197 	if (*status & FE_HAS_VITERBI) {
198 		unsigned int cnr, const_a, const_b;
199 
200 		ret = regmap_read(priv->regmap[1], 0x0019, &utmp);
201 		if (ret)
202 			goto error;
203 
204 		if (((utmp >> 0) & 0x03) % 2) {
205 			const_a = 8750;
206 			const_b = 650;
207 		} else {
208 			const_a = 9500;
209 			const_b = 760;
210 		}
211 
212 		ret = regmap_read(priv->regmap[1], 0x004d, &utmp);
213 		if (ret)
214 			goto error;
215 
216 		#define CXD2820R_LOG2_E_24 24204406 /* log2(e) << 24 */
217 		if (utmp)
218 			cnr = div_u64((u64)(intlog2(const_b) - intlog2(utmp))
219 				      * const_a, CXD2820R_LOG2_E_24);
220 		else
221 			cnr = 0;
222 
223 		c->cnr.len = 1;
224 		c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
225 		c->cnr.stat[0].svalue = cnr;
226 	} else {
227 		c->cnr.len = 1;
228 		c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
229 	}
230 
231 	/* BER */
232 	if (*status & FE_HAS_SYNC) {
233 		unsigned int post_bit_error;
234 		bool start_ber;
235 
236 		if (priv->ber_running) {
237 			ret = regmap_bulk_read(priv->regmap[1], 0x0076, buf, 3);
238 			if (ret)
239 				goto error;
240 
241 			if ((buf[2] >> 7) & 0x01) {
242 				post_bit_error = buf[2] << 16 | buf[1] << 8 |
243 						 buf[0] << 0;
244 				post_bit_error &= 0x0fffff;
245 				start_ber = true;
246 			} else {
247 				post_bit_error = 0;
248 				start_ber = false;
249 			}
250 		} else {
251 			post_bit_error = 0;
252 			start_ber = true;
253 		}
254 
255 		if (start_ber) {
256 			ret = regmap_write(priv->regmap[1], 0x0079, 0x01);
257 			if (ret)
258 				goto error;
259 			priv->ber_running = true;
260 		}
261 
262 		priv->post_bit_error += post_bit_error;
263 
264 		c->post_bit_error.len = 1;
265 		c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
266 		c->post_bit_error.stat[0].uvalue = priv->post_bit_error;
267 	} else {
268 		c->post_bit_error.len = 1;
269 		c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
270 	}
271 
272 	return ret;
273 error:
274 	dev_dbg(&client->dev, "failed=%d\n", ret);
275 	return ret;
276 }
277 
278 int cxd2820r_init_c(struct dvb_frontend *fe)
279 {
280 	struct cxd2820r_priv *priv = fe->demodulator_priv;
281 	struct i2c_client *client = priv->client[0];
282 	int ret;
283 
284 	dev_dbg(&client->dev, "\n");
285 
286 	ret = regmap_write(priv->regmap[0], 0x0085, 0x07);
287 	if (ret)
288 		goto error;
289 
290 	return ret;
291 error:
292 	dev_dbg(&client->dev, "failed=%d\n", ret);
293 	return ret;
294 }
295 
296 int cxd2820r_sleep_c(struct dvb_frontend *fe)
297 {
298 	struct cxd2820r_priv *priv = fe->demodulator_priv;
299 	struct i2c_client *client = priv->client[0];
300 	int ret;
301 	struct reg_val_mask tab[] = {
302 		{ 0x000ff, 0x1f, 0xff },
303 		{ 0x00085, 0x00, 0xff },
304 		{ 0x00088, 0x01, 0xff },
305 		{ 0x00081, 0x00, 0xff },
306 		{ 0x00080, 0x00, 0xff },
307 	};
308 
309 	dev_dbg(&client->dev, "\n");
310 
311 	priv->delivery_system = SYS_UNDEFINED;
312 
313 	ret = cxd2820r_wr_reg_val_mask_tab(priv, tab, ARRAY_SIZE(tab));
314 	if (ret)
315 		goto error;
316 
317 	return ret;
318 error:
319 	dev_dbg(&client->dev, "failed=%d\n", ret);
320 	return ret;
321 }
322 
323 int cxd2820r_get_tune_settings_c(struct dvb_frontend *fe,
324 	struct dvb_frontend_tune_settings *s)
325 {
326 	s->min_delay_ms = 500;
327 	s->step_size = 0; /* no zigzag */
328 	s->max_drift = 0;
329 
330 	return 0;
331 }
332