1 /*
2 Conexant cx22700 DVB OFDM demodulator driver
3
4 Copyright (C) 2001-2002 Convergence Integrated Media GmbH
5 Holger Waechtler <holger@convergence.de>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/string.h>
27 #include <linux/slab.h>
28 #include "dvb_frontend.h"
29 #include "cx22700.h"
30
31
32 struct cx22700_state {
33
34 struct i2c_adapter* i2c;
35
36 const struct cx22700_config* config;
37
38 struct dvb_frontend frontend;
39 };
40
41
42 static int debug;
43 #define dprintk(args...) \
44 do { \
45 if (debug) printk(KERN_DEBUG "cx22700: " args); \
46 } while (0)
47
48 static u8 init_tab [] = {
49 0x04, 0x10,
50 0x05, 0x09,
51 0x06, 0x00,
52 0x08, 0x04,
53 0x09, 0x00,
54 0x0a, 0x01,
55 0x15, 0x40,
56 0x16, 0x10,
57 0x17, 0x87,
58 0x18, 0x17,
59 0x1a, 0x10,
60 0x25, 0x04,
61 0x2e, 0x00,
62 0x39, 0x00,
63 0x3a, 0x04,
64 0x45, 0x08,
65 0x46, 0x02,
66 0x47, 0x05,
67 };
68
69
70 static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)
71 {
72 int ret;
73 u8 buf [] = { reg, data };
74 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
75
76 dprintk ("%s\n", __func__);
77
78 ret = i2c_transfer (state->i2c, &msg, 1);
79
80 if (ret != 1)
81 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
82 __func__, reg, data, ret);
83
84 return (ret != 1) ? -1 : 0;
85 }
86
87 static int cx22700_readreg (struct cx22700_state* state, u8 reg)
88 {
89 int ret;
90 u8 b0 [] = { reg };
91 u8 b1 [] = { 0 };
92 struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
93 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
94
95 dprintk ("%s\n", __func__);
96
97 ret = i2c_transfer (state->i2c, msg, 2);
98
99 if (ret != 2) return -EIO;
100
101 return b1[0];
102 }
103
104 static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
105 {
106 u8 val;
107
108 dprintk ("%s\n", __func__);
109
110 switch (inversion) {
111 case INVERSION_AUTO:
112 return -EOPNOTSUPP;
113 case INVERSION_ON:
114 val = cx22700_readreg (state, 0x09);
115 return cx22700_writereg (state, 0x09, val | 0x01);
116 case INVERSION_OFF:
117 val = cx22700_readreg (state, 0x09);
118 return cx22700_writereg (state, 0x09, val & 0xfe);
119 default:
120 return -EINVAL;
121 }
122 }
123
124 static int cx22700_set_tps (struct cx22700_state *state, struct dvb_ofdm_parameters *p)
125 {
126 static const u8 qam_tab [4] = { 0, 1, 0, 2 };
127 static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
128 u8 val;
129
130 dprintk ("%s\n", __func__);
131
132 if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
133 return -EINVAL;
134
135 if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
136 return -EINVAL;
137
138 if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
139 return -EINVAL;
140
141 if (p->guard_interval < GUARD_INTERVAL_1_32 ||
142 p->guard_interval > GUARD_INTERVAL_1_4)
143 return -EINVAL;
144
145 if (p->transmission_mode != TRANSMISSION_MODE_2K &&
146 p->transmission_mode != TRANSMISSION_MODE_8K)
147 return -EINVAL;
148
149 if (p->constellation != QPSK &&
150 p->constellation != QAM_16 &&
151 p->constellation != QAM_64)
152 return -EINVAL;
153
154 if (p->hierarchy_information < HIERARCHY_NONE ||
155 p->hierarchy_information > HIERARCHY_4)
156 return -EINVAL;
157
158 if (p->bandwidth < BANDWIDTH_8_MHZ && p->bandwidth > BANDWIDTH_6_MHZ)
159 return -EINVAL;
160
161 if (p->bandwidth == BANDWIDTH_7_MHZ)
162 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
163 else
164 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
165
166 val = qam_tab[p->constellation - QPSK];
167 val |= p->hierarchy_information - HIERARCHY_NONE;
168
169 cx22700_writereg (state, 0x04, val);
170
171 val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
172 val |= fec_tab[p->code_rate_LP - FEC_1_2];
173
174 cx22700_writereg (state, 0x05, val);
175
176 val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
177 val |= p->transmission_mode - TRANSMISSION_MODE_2K;
178
179 cx22700_writereg (state, 0x06, val);
180
181 cx22700_writereg (state, 0x08, 0x04 | 0x02); /* use user tps parameters */
182 cx22700_writereg (state, 0x08, 0x04); /* restart aquisition */
183
184 return 0;
185 }
186
187 static int cx22700_get_tps (struct cx22700_state* state, struct dvb_ofdm_parameters *p)
188 {
189 static const fe_modulation_t qam_tab [3] = { QPSK, QAM_16, QAM_64 };
190 static const fe_code_rate_t fec_tab [5] = { FEC_1_2, FEC_2_3, FEC_3_4,
191 FEC_5_6, FEC_7_8 };
192 u8 val;
193
194 dprintk ("%s\n", __func__);
195
196 if (!(cx22700_readreg(state, 0x07) & 0x20)) /* tps valid? */
197 return -EAGAIN;
198
199 val = cx22700_readreg (state, 0x01);
200
201 if ((val & 0x7) > 4)
202 p->hierarchy_information = HIERARCHY_AUTO;
203 else
204 p->hierarchy_information = HIERARCHY_NONE + (val & 0x7);
205
206 if (((val >> 3) & 0x3) > 2)
207 p->constellation = QAM_AUTO;
208 else
209 p->constellation = qam_tab[(val >> 3) & 0x3];
210
211 val = cx22700_readreg (state, 0x02);
212
213 if (((val >> 3) & 0x07) > 4)
214 p->code_rate_HP = FEC_AUTO;
215 else
216 p->code_rate_HP = fec_tab[(val >> 3) & 0x07];
217
218 if ((val & 0x07) > 4)
219 p->code_rate_LP = FEC_AUTO;
220 else
221 p->code_rate_LP = fec_tab[val & 0x07];
222
223 val = cx22700_readreg (state, 0x03);
224
225 p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
226 p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);
227
228 return 0;
229 }
230
231 static int cx22700_init (struct dvb_frontend* fe)
232
233 { struct cx22700_state* state = fe->demodulator_priv;
234 int i;
235
236 dprintk("cx22700_init: init chip\n");
237
238 cx22700_writereg (state, 0x00, 0x02); /* soft reset */
239 cx22700_writereg (state, 0x00, 0x00);
240
241 msleep(10);
242
243 for (i=0; i<sizeof(init_tab); i+=2)
244 cx22700_writereg (state, init_tab[i], init_tab[i+1]);
245
246 cx22700_writereg (state, 0x00, 0x01);
247
248 return 0;
249 }
250
251 static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status)
252 {
253 struct cx22700_state* state = fe->demodulator_priv;
254
255 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
256 | (cx22700_readreg (state, 0x0e) << 1);
257 u8 sync = cx22700_readreg (state, 0x07);
258
259 *status = 0;
260
261 if (rs_ber < 0xff00)
262 *status |= FE_HAS_SIGNAL;
263
264 if (sync & 0x20)
265 *status |= FE_HAS_CARRIER;
266
267 if (sync & 0x10)
268 *status |= FE_HAS_VITERBI;
269
270 if (sync & 0x10)
271 *status |= FE_HAS_SYNC;
272
273 if (*status == 0x0f)
274 *status |= FE_HAS_LOCK;
275
276 return 0;
277 }
278
279 static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
280 {
281 struct cx22700_state* state = fe->demodulator_priv;
282
283 *ber = cx22700_readreg (state, 0x0c) & 0x7f;
284 cx22700_writereg (state, 0x0c, 0x00);
285
286 return 0;
287 }
288
289 static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
290 {
291 struct cx22700_state* state = fe->demodulator_priv;
292
293 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
294 | (cx22700_readreg (state, 0x0e) << 1);
295 *signal_strength = ~rs_ber;
296
297 return 0;
298 }
299
300 static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
301 {
302 struct cx22700_state* state = fe->demodulator_priv;
303
304 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
305 | (cx22700_readreg (state, 0x0e) << 1);
306 *snr = ~rs_ber;
307
308 return 0;
309 }
310
311 static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
312 {
313 struct cx22700_state* state = fe->demodulator_priv;
314
315 *ucblocks = cx22700_readreg (state, 0x0f);
316 cx22700_writereg (state, 0x0f, 0x00);
317
318 return 0;
319 }
320
321 static int cx22700_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
322 {
323 struct cx22700_state* state = fe->demodulator_priv;
324
325 cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
326 cx22700_writereg (state, 0x00, 0x00);
327
328 if (fe->ops.tuner_ops.set_params) {
329 fe->ops.tuner_ops.set_params(fe, p);
330 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
331 }
332
333 cx22700_set_inversion (state, p->inversion);
334 cx22700_set_tps (state, &p->u.ofdm);
335 cx22700_writereg (state, 0x37, 0x01); /* PAL loop filter off */
336 cx22700_writereg (state, 0x00, 0x01); /* restart acquire */
337
338 return 0;
339 }
340
341 static int cx22700_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
342 {
343 struct cx22700_state* state = fe->demodulator_priv;
344 u8 reg09 = cx22700_readreg (state, 0x09);
345
346 p->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
347 return cx22700_get_tps (state, &p->u.ofdm);
348 }
349
350 static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
351 {
352 struct cx22700_state* state = fe->demodulator_priv;
353
354 if (enable) {
355 return cx22700_writereg(state, 0x0a, 0x00);
356 } else {
357 return cx22700_writereg(state, 0x0a, 0x01);
358 }
359 }
360
361 static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
362 {
363 fesettings->min_delay_ms = 150;
364 fesettings->step_size = 166667;
365 fesettings->max_drift = 166667*2;
366 return 0;
367 }
368
369 static void cx22700_release(struct dvb_frontend* fe)
370 {
371 struct cx22700_state* state = fe->demodulator_priv;
372 kfree(state);
373 }
374
375 static struct dvb_frontend_ops cx22700_ops;
376
377 struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
378 struct i2c_adapter* i2c)
379 {
380 struct cx22700_state* state = NULL;
381
382 /* allocate memory for the internal state */
383 state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL);
384 if (state == NULL) goto error;
385
386 /* setup the state */
387 state->config = config;
388 state->i2c = i2c;
389
390 /* check if the demod is there */
391 if (cx22700_readreg(state, 0x07) < 0) goto error;
392
393 /* create dvb_frontend */
394 memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
395 state->frontend.demodulator_priv = state;
396 return &state->frontend;
397
398 error:
399 kfree(state);
400 return NULL;
401 }
402
403 static struct dvb_frontend_ops cx22700_ops = {
404
405 .info = {
406 .name = "Conexant CX22700 DVB-T",
407 .type = FE_OFDM,
408 .frequency_min = 470000000,
409 .frequency_max = 860000000,
410 .frequency_stepsize = 166667,
411 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
412 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
413 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
414 FE_CAN_RECOVER
415 },
416
417 .release = cx22700_release,
418
419 .init = cx22700_init,
420 .i2c_gate_ctrl = cx22700_i2c_gate_ctrl,
421
422 .set_frontend = cx22700_set_frontend,
423 .get_frontend = cx22700_get_frontend,
424 .get_tune_settings = cx22700_get_tune_settings,
425
426 .read_status = cx22700_read_status,
427 .read_ber = cx22700_read_ber,
428 .read_signal_strength = cx22700_read_signal_strength,
429 .read_snr = cx22700_read_snr,
430 .read_ucblocks = cx22700_read_ucblocks,
431 };
432
433 module_param(debug, int, 0644);
434 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
435
436 MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
437 MODULE_AUTHOR("Holger Waechtler");
438 MODULE_LICENSE("GPL");
439
440 EXPORT_SYMBOL(cx22700_attach);
441
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