1 /*
2  * TerraTec Cinergy T2/qanu USB2 DVB-T adapter.
3  *
4  * Copyright (C) 2007 Tomi Orava (tomimo@ncircle.nullnet.fi)
5  *
6  * Based on the dvb-usb-framework code and the
7  * original Terratec Cinergy T2 driver by:
8  *
9  * Copyright (C) 2004 Daniel Mack <daniel@qanu.de> and
10  *                  Holger Waechtler <holger@qanu.de>
11  *
12  *  Protocol Spec published on http://qanu.de/specs/terratec_cinergyT2.pdf
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2 of the License, or
17  * (at your option) any later version.
18  *
19  * This program is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22  * GNU General Public License for more details.
23  *
24  */
25 
26 #include "cinergyT2.h"
27 
28 
29 /*
30  *  convert linux-dvb frontend parameter set into TPS.
31  *  See ETSI ETS-300744, section 4.6.2, table 9 for details.
32  *
33  *  This function is probably reusable and may better get placed in a support
34  *  library.
35  *
36  *  We replace erroneous fields by default TPS fields (the ones with value 0).
37  */
38 
39 static uint16_t compute_tps(struct dtv_frontend_properties *op)
40 {
41 	uint16_t tps = 0;
42 
43 	switch (op->code_rate_HP) {
44 	case FEC_2_3:
45 		tps |= (1 << 7);
46 		break;
47 	case FEC_3_4:
48 		tps |= (2 << 7);
49 		break;
50 	case FEC_5_6:
51 		tps |= (3 << 7);
52 		break;
53 	case FEC_7_8:
54 		tps |= (4 << 7);
55 		break;
56 	case FEC_1_2:
57 	case FEC_AUTO:
58 	default:
59 		/* tps |= (0 << 7) */;
60 	}
61 
62 	switch (op->code_rate_LP) {
63 	case FEC_2_3:
64 		tps |= (1 << 4);
65 		break;
66 	case FEC_3_4:
67 		tps |= (2 << 4);
68 		break;
69 	case FEC_5_6:
70 		tps |= (3 << 4);
71 		break;
72 	case FEC_7_8:
73 		tps |= (4 << 4);
74 		break;
75 	case FEC_1_2:
76 	case FEC_AUTO:
77 	default:
78 		/* tps |= (0 << 4) */;
79 	}
80 
81 	switch (op->modulation) {
82 	case QAM_16:
83 		tps |= (1 << 13);
84 		break;
85 	case QAM_64:
86 		tps |= (2 << 13);
87 		break;
88 	case QPSK:
89 	default:
90 		/* tps |= (0 << 13) */;
91 	}
92 
93 	switch (op->transmission_mode) {
94 	case TRANSMISSION_MODE_8K:
95 		tps |= (1 << 0);
96 		break;
97 	case TRANSMISSION_MODE_2K:
98 	default:
99 		/* tps |= (0 << 0) */;
100 	}
101 
102 	switch (op->guard_interval) {
103 	case GUARD_INTERVAL_1_16:
104 		tps |= (1 << 2);
105 		break;
106 	case GUARD_INTERVAL_1_8:
107 		tps |= (2 << 2);
108 		break;
109 	case GUARD_INTERVAL_1_4:
110 		tps |= (3 << 2);
111 		break;
112 	case GUARD_INTERVAL_1_32:
113 	default:
114 		/* tps |= (0 << 2) */;
115 	}
116 
117 	switch (op->hierarchy) {
118 	case HIERARCHY_1:
119 		tps |= (1 << 10);
120 		break;
121 	case HIERARCHY_2:
122 		tps |= (2 << 10);
123 		break;
124 	case HIERARCHY_4:
125 		tps |= (3 << 10);
126 		break;
127 	case HIERARCHY_NONE:
128 	default:
129 		/* tps |= (0 << 10) */;
130 	}
131 
132 	return tps;
133 }
134 
135 struct cinergyt2_fe_state {
136 	struct dvb_frontend fe;
137 	struct dvb_usb_device *d;
138 
139 	unsigned char data[64];
140 	struct mutex data_mutex;
141 
142 	struct dvbt_get_status_msg status;
143 };
144 
145 static int cinergyt2_fe_read_status(struct dvb_frontend *fe,
146 				    enum fe_status *status)
147 {
148 	struct cinergyt2_fe_state *state = fe->demodulator_priv;
149 	int ret;
150 
151 	mutex_lock(&state->data_mutex);
152 	state->data[0] = CINERGYT2_EP1_GET_TUNER_STATUS;
153 
154 	ret = dvb_usb_generic_rw(state->d, state->data, 1,
155 				 state->data, sizeof(state->status), 0);
156 	if (!ret)
157 		memcpy(&state->status, state->data, sizeof(state->status));
158 	mutex_unlock(&state->data_mutex);
159 
160 	if (ret < 0)
161 		return ret;
162 
163 	*status = 0;
164 
165 	if (0xffff - le16_to_cpu(state->status.gain) > 30)
166 		*status |= FE_HAS_SIGNAL;
167 	if (state->status.lock_bits & (1 << 6))
168 		*status |= FE_HAS_LOCK;
169 	if (state->status.lock_bits & (1 << 5))
170 		*status |= FE_HAS_SYNC;
171 	if (state->status.lock_bits & (1 << 4))
172 		*status |= FE_HAS_CARRIER;
173 	if (state->status.lock_bits & (1 << 1))
174 		*status |= FE_HAS_VITERBI;
175 
176 	if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
177 			(FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
178 		*status &= ~FE_HAS_LOCK;
179 
180 	return 0;
181 }
182 
183 static int cinergyt2_fe_read_ber(struct dvb_frontend *fe, u32 *ber)
184 {
185 	struct cinergyt2_fe_state *state = fe->demodulator_priv;
186 
187 	*ber = le32_to_cpu(state->status.viterbi_error_rate);
188 	return 0;
189 }
190 
191 static int cinergyt2_fe_read_unc_blocks(struct dvb_frontend *fe, u32 *unc)
192 {
193 	struct cinergyt2_fe_state *state = fe->demodulator_priv;
194 
195 	*unc = le32_to_cpu(state->status.uncorrected_block_count);
196 	return 0;
197 }
198 
199 static int cinergyt2_fe_read_signal_strength(struct dvb_frontend *fe,
200 						u16 *strength)
201 {
202 	struct cinergyt2_fe_state *state = fe->demodulator_priv;
203 
204 	*strength = (0xffff - le16_to_cpu(state->status.gain));
205 	return 0;
206 }
207 
208 static int cinergyt2_fe_read_snr(struct dvb_frontend *fe, u16 *snr)
209 {
210 	struct cinergyt2_fe_state *state = fe->demodulator_priv;
211 
212 	*snr = (state->status.snr << 8) | state->status.snr;
213 	return 0;
214 }
215 
216 static int cinergyt2_fe_init(struct dvb_frontend *fe)
217 {
218 	return 0;
219 }
220 
221 static int cinergyt2_fe_sleep(struct dvb_frontend *fe)
222 {
223 	deb_info("cinergyt2_fe_sleep() Called\n");
224 	return 0;
225 }
226 
227 static int cinergyt2_fe_get_tune_settings(struct dvb_frontend *fe,
228 				struct dvb_frontend_tune_settings *tune)
229 {
230 	tune->min_delay_ms = 800;
231 	return 0;
232 }
233 
234 static int cinergyt2_fe_set_frontend(struct dvb_frontend *fe)
235 {
236 	struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
237 	struct cinergyt2_fe_state *state = fe->demodulator_priv;
238 	struct dvbt_set_parameters_msg *param;
239 	int err;
240 
241 	mutex_lock(&state->data_mutex);
242 
243 	param = (void *)state->data;
244 	param->cmd = CINERGYT2_EP1_SET_TUNER_PARAMETERS;
245 	param->tps = cpu_to_le16(compute_tps(fep));
246 	param->freq = cpu_to_le32(fep->frequency / 1000);
247 	param->flags = 0;
248 
249 	switch (fep->bandwidth_hz) {
250 	default:
251 	case 8000000:
252 		param->bandwidth = 8;
253 		break;
254 	case 7000000:
255 		param->bandwidth = 7;
256 		break;
257 	case 6000000:
258 		param->bandwidth = 6;
259 		break;
260 	}
261 
262 	err = dvb_usb_generic_rw(state->d, state->data, sizeof(*param),
263 				 state->data, 2, 0);
264 	if (err < 0)
265 		err("cinergyt2_fe_set_frontend() Failed! err=%d\n", err);
266 
267 	mutex_unlock(&state->data_mutex);
268 	return (err < 0) ? err : 0;
269 }
270 
271 static void cinergyt2_fe_release(struct dvb_frontend *fe)
272 {
273 	struct cinergyt2_fe_state *state = fe->demodulator_priv;
274 	kfree(state);
275 }
276 
277 static const struct dvb_frontend_ops cinergyt2_fe_ops;
278 
279 struct dvb_frontend *cinergyt2_fe_attach(struct dvb_usb_device *d)
280 {
281 	struct cinergyt2_fe_state *s = kzalloc(sizeof(
282 					struct cinergyt2_fe_state), GFP_KERNEL);
283 	if (s == NULL)
284 		return NULL;
285 
286 	s->d = d;
287 	memcpy(&s->fe.ops, &cinergyt2_fe_ops, sizeof(struct dvb_frontend_ops));
288 	s->fe.demodulator_priv = s;
289 	mutex_init(&s->data_mutex);
290 	return &s->fe;
291 }
292 
293 
294 static const struct dvb_frontend_ops cinergyt2_fe_ops = {
295 	.delsys = { SYS_DVBT },
296 	.info = {
297 		.name			= DRIVER_NAME,
298 		.frequency_min_hz	= 174 * MHz,
299 		.frequency_max_hz	= 862 * MHz,
300 		.frequency_stepsize_hz	= 166667,
301 		.caps = FE_CAN_INVERSION_AUTO | FE_CAN_FEC_1_2
302 			| FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4
303 			| FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8
304 			| FE_CAN_FEC_AUTO | FE_CAN_QPSK
305 			| FE_CAN_QAM_16 | FE_CAN_QAM_64
306 			| FE_CAN_QAM_AUTO
307 			| FE_CAN_TRANSMISSION_MODE_AUTO
308 			| FE_CAN_GUARD_INTERVAL_AUTO
309 			| FE_CAN_HIERARCHY_AUTO
310 			| FE_CAN_RECOVER
311 			| FE_CAN_MUTE_TS
312 	},
313 
314 	.release		= cinergyt2_fe_release,
315 
316 	.init			= cinergyt2_fe_init,
317 	.sleep			= cinergyt2_fe_sleep,
318 
319 	.set_frontend		= cinergyt2_fe_set_frontend,
320 	.get_tune_settings	= cinergyt2_fe_get_tune_settings,
321 
322 	.read_status		= cinergyt2_fe_read_status,
323 	.read_ber		= cinergyt2_fe_read_ber,
324 	.read_signal_strength	= cinergyt2_fe_read_signal_strength,
325 	.read_snr		= cinergyt2_fe_read_snr,
326 	.read_ucblocks		= cinergyt2_fe_read_unc_blocks,
327 };
328