Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
271ddbf7 | 76 | dprintk ("%s\n", __func__); |
1da177e4 LT |
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", | |
271ddbf7 | 82 | __func__, reg, data, ret); |
1da177e4 LT |
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 | ||
271ddbf7 | 95 | dprintk ("%s\n", __func__); |
1da177e4 LT |
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 | ||
271ddbf7 | 108 | dprintk ("%s\n", __func__); |
1da177e4 LT |
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 | ||
fd607212 MCC |
124 | static int cx22700_set_tps(struct cx22700_state *state, |
125 | struct dtv_frontend_properties *p) | |
1da177e4 LT |
126 | { |
127 | static const u8 qam_tab [4] = { 0, 1, 0, 2 }; | |
128 | static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 }; | |
129 | u8 val; | |
130 | ||
271ddbf7 | 131 | dprintk ("%s\n", __func__); |
1da177e4 LT |
132 | |
133 | if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8) | |
134 | return -EINVAL; | |
135 | ||
136 | if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8) | |
91a07919 | 137 | return -EINVAL; |
1da177e4 LT |
138 | |
139 | if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5) | |
140 | return -EINVAL; | |
141 | ||
830e4b55 | 142 | if ((int)p->guard_interval < GUARD_INTERVAL_1_32 || |
1da177e4 LT |
143 | p->guard_interval > GUARD_INTERVAL_1_4) |
144 | return -EINVAL; | |
145 | ||
146 | if (p->transmission_mode != TRANSMISSION_MODE_2K && | |
147 | p->transmission_mode != TRANSMISSION_MODE_8K) | |
148 | return -EINVAL; | |
149 | ||
fd607212 MCC |
150 | if (p->modulation != QPSK && |
151 | p->modulation != QAM_16 && | |
152 | p->modulation != QAM_64) | |
1da177e4 LT |
153 | return -EINVAL; |
154 | ||
830e4b55 | 155 | if ((int)p->hierarchy < HIERARCHY_NONE || |
fd607212 | 156 | p->hierarchy > HIERARCHY_4) |
1da177e4 LT |
157 | return -EINVAL; |
158 | ||
fd607212 | 159 | if (p->bandwidth_hz > 8000000 || p->bandwidth_hz < 6000000) |
1da177e4 LT |
160 | return -EINVAL; |
161 | ||
fd607212 | 162 | if (p->bandwidth_hz == 7000000) |
1da177e4 LT |
163 | cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10)); |
164 | else | |
165 | cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10)); | |
166 | ||
fd607212 MCC |
167 | val = qam_tab[p->modulation - QPSK]; |
168 | val |= p->hierarchy - HIERARCHY_NONE; | |
1da177e4 LT |
169 | |
170 | cx22700_writereg (state, 0x04, val); | |
171 | ||
667c952e MCC |
172 | if (p->code_rate_HP - FEC_1_2 >= sizeof(fec_tab) || |
173 | p->code_rate_LP - FEC_1_2 >= sizeof(fec_tab)) | |
174 | return -EINVAL; | |
1da177e4 LT |
175 | val = fec_tab[p->code_rate_HP - FEC_1_2] << 3; |
176 | val |= fec_tab[p->code_rate_LP - FEC_1_2]; | |
177 | ||
178 | cx22700_writereg (state, 0x05, val); | |
179 | ||
180 | val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2; | |
181 | val |= p->transmission_mode - TRANSMISSION_MODE_2K; | |
182 | ||
183 | cx22700_writereg (state, 0x06, val); | |
184 | ||
185 | cx22700_writereg (state, 0x08, 0x04 | 0x02); /* use user tps parameters */ | |
25985edc | 186 | cx22700_writereg (state, 0x08, 0x04); /* restart acquisition */ |
1da177e4 LT |
187 | |
188 | return 0; | |
189 | } | |
190 | ||
fd607212 MCC |
191 | static int cx22700_get_tps(struct cx22700_state *state, |
192 | struct dtv_frontend_properties *p) | |
1da177e4 | 193 | { |
0df289a2 MCC |
194 | static const enum fe_modulation qam_tab[3] = { QPSK, QAM_16, QAM_64 }; |
195 | static const enum fe_code_rate fec_tab[5] = { | |
196 | FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8 | |
197 | }; | |
1da177e4 LT |
198 | u8 val; |
199 | ||
271ddbf7 | 200 | dprintk ("%s\n", __func__); |
1da177e4 LT |
201 | |
202 | if (!(cx22700_readreg(state, 0x07) & 0x20)) /* tps valid? */ | |
203 | return -EAGAIN; | |
204 | ||
205 | val = cx22700_readreg (state, 0x01); | |
206 | ||
207 | if ((val & 0x7) > 4) | |
fd607212 | 208 | p->hierarchy = HIERARCHY_AUTO; |
1da177e4 | 209 | else |
fd607212 | 210 | p->hierarchy = HIERARCHY_NONE + (val & 0x7); |
1da177e4 LT |
211 | |
212 | if (((val >> 3) & 0x3) > 2) | |
fd607212 | 213 | p->modulation = QAM_AUTO; |
1da177e4 | 214 | else |
fd607212 | 215 | p->modulation = qam_tab[(val >> 3) & 0x3]; |
1da177e4 LT |
216 | |
217 | val = cx22700_readreg (state, 0x02); | |
218 | ||
219 | if (((val >> 3) & 0x07) > 4) | |
220 | p->code_rate_HP = FEC_AUTO; | |
221 | else | |
222 | p->code_rate_HP = fec_tab[(val >> 3) & 0x07]; | |
223 | ||
224 | if ((val & 0x07) > 4) | |
225 | p->code_rate_LP = FEC_AUTO; | |
226 | else | |
227 | p->code_rate_LP = fec_tab[val & 0x07]; | |
228 | ||
229 | val = cx22700_readreg (state, 0x03); | |
230 | ||
231 | p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3); | |
232 | p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static int cx22700_init (struct dvb_frontend* fe) | |
238 | ||
b8742700 | 239 | { struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
240 | int i; |
241 | ||
242 | dprintk("cx22700_init: init chip\n"); | |
243 | ||
244 | cx22700_writereg (state, 0x00, 0x02); /* soft reset */ | |
245 | cx22700_writereg (state, 0x00, 0x00); | |
246 | ||
247 | msleep(10); | |
248 | ||
249 | for (i=0; i<sizeof(init_tab); i+=2) | |
250 | cx22700_writereg (state, init_tab[i], init_tab[i+1]); | |
251 | ||
252 | cx22700_writereg (state, 0x00, 0x01); | |
253 | ||
1da177e4 LT |
254 | return 0; |
255 | } | |
256 | ||
0df289a2 | 257 | static int cx22700_read_status(struct dvb_frontend *fe, enum fe_status *status) |
1da177e4 | 258 | { |
b8742700 | 259 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
260 | |
261 | u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9) | |
262 | | (cx22700_readreg (state, 0x0e) << 1); | |
263 | u8 sync = cx22700_readreg (state, 0x07); | |
264 | ||
265 | *status = 0; | |
266 | ||
267 | if (rs_ber < 0xff00) | |
268 | *status |= FE_HAS_SIGNAL; | |
269 | ||
270 | if (sync & 0x20) | |
271 | *status |= FE_HAS_CARRIER; | |
272 | ||
273 | if (sync & 0x10) | |
274 | *status |= FE_HAS_VITERBI; | |
275 | ||
276 | if (sync & 0x10) | |
277 | *status |= FE_HAS_SYNC; | |
278 | ||
279 | if (*status == 0x0f) | |
280 | *status |= FE_HAS_LOCK; | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber) | |
286 | { | |
b8742700 | 287 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
288 | |
289 | *ber = cx22700_readreg (state, 0x0c) & 0x7f; | |
290 | cx22700_writereg (state, 0x0c, 0x00); | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength) | |
296 | { | |
b8742700 | 297 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
298 | |
299 | u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9) | |
300 | | (cx22700_readreg (state, 0x0e) << 1); | |
301 | *signal_strength = ~rs_ber; | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr) | |
307 | { | |
b8742700 | 308 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
309 | |
310 | u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9) | |
311 | | (cx22700_readreg (state, 0x0e) << 1); | |
312 | *snr = ~rs_ber; | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks) | |
318 | { | |
b8742700 | 319 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
320 | |
321 | *ucblocks = cx22700_readreg (state, 0x0f); | |
322 | cx22700_writereg (state, 0x0f, 0x00); | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
fd607212 | 327 | static int cx22700_set_frontend(struct dvb_frontend *fe) |
1da177e4 | 328 | { |
fd607212 | 329 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
b8742700 | 330 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
331 | |
332 | cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/ | |
333 | cx22700_writereg (state, 0x00, 0x00); | |
334 | ||
dea74869 | 335 | if (fe->ops.tuner_ops.set_params) { |
14d24d14 | 336 | fe->ops.tuner_ops.set_params(fe); |
dea74869 | 337 | if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); |
5becb3b0 AQ |
338 | } |
339 | ||
fd607212 MCC |
340 | cx22700_set_inversion(state, c->inversion); |
341 | cx22700_set_tps(state, c); | |
1da177e4 LT |
342 | cx22700_writereg (state, 0x37, 0x01); /* PAL loop filter off */ |
343 | cx22700_writereg (state, 0x00, 0x01); /* restart acquire */ | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
7c61d80a | 348 | static int cx22700_get_frontend(struct dvb_frontend *fe) |
1da177e4 | 349 | { |
7c61d80a | 350 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
b8742700 | 351 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
352 | u8 reg09 = cx22700_readreg (state, 0x09); |
353 | ||
fd607212 MCC |
354 | c->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF; |
355 | return cx22700_get_tps(state, c); | |
1da177e4 LT |
356 | } |
357 | ||
5becb3b0 AQ |
358 | static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable) |
359 | { | |
360 | struct cx22700_state* state = fe->demodulator_priv; | |
361 | ||
362 | if (enable) { | |
363 | return cx22700_writereg(state, 0x0a, 0x00); | |
364 | } else { | |
365 | return cx22700_writereg(state, 0x0a, 0x01); | |
366 | } | |
367 | } | |
368 | ||
1da177e4 LT |
369 | static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings) |
370 | { | |
9101e622 MCC |
371 | fesettings->min_delay_ms = 150; |
372 | fesettings->step_size = 166667; | |
373 | fesettings->max_drift = 166667*2; | |
374 | return 0; | |
1da177e4 LT |
375 | } |
376 | ||
377 | static void cx22700_release(struct dvb_frontend* fe) | |
378 | { | |
b8742700 | 379 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
380 | kfree(state); |
381 | } | |
382 | ||
383 | static struct dvb_frontend_ops cx22700_ops; | |
384 | ||
385 | struct dvb_frontend* cx22700_attach(const struct cx22700_config* config, | |
386 | struct i2c_adapter* i2c) | |
387 | { | |
388 | struct cx22700_state* state = NULL; | |
389 | ||
390 | /* allocate memory for the internal state */ | |
084e24ac | 391 | state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL); |
1da177e4 LT |
392 | if (state == NULL) goto error; |
393 | ||
394 | /* setup the state */ | |
395 | state->config = config; | |
396 | state->i2c = i2c; | |
1da177e4 LT |
397 | |
398 | /* check if the demod is there */ | |
399 | if (cx22700_readreg(state, 0x07) < 0) goto error; | |
400 | ||
401 | /* create dvb_frontend */ | |
dea74869 | 402 | memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops)); |
1da177e4 LT |
403 | state->frontend.demodulator_priv = state; |
404 | return &state->frontend; | |
405 | ||
406 | error: | |
407 | kfree(state); | |
408 | return NULL; | |
409 | } | |
410 | ||
411 | static struct dvb_frontend_ops cx22700_ops = { | |
fd607212 | 412 | .delsys = { SYS_DVBT }, |
1da177e4 LT |
413 | .info = { |
414 | .name = "Conexant CX22700 DVB-T", | |
1da177e4 LT |
415 | .frequency_min = 470000000, |
416 | .frequency_max = 860000000, | |
417 | .frequency_stepsize = 166667, | |
418 | .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | | |
419 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | | |
420 | FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | | |
9101e622 | 421 | FE_CAN_RECOVER |
1da177e4 LT |
422 | }, |
423 | ||
424 | .release = cx22700_release, | |
425 | ||
426 | .init = cx22700_init, | |
5becb3b0 | 427 | .i2c_gate_ctrl = cx22700_i2c_gate_ctrl, |
1da177e4 | 428 | |
fd607212 MCC |
429 | .set_frontend = cx22700_set_frontend, |
430 | .get_frontend = cx22700_get_frontend, | |
1da177e4 LT |
431 | .get_tune_settings = cx22700_get_tune_settings, |
432 | ||
433 | .read_status = cx22700_read_status, | |
434 | .read_ber = cx22700_read_ber, | |
435 | .read_signal_strength = cx22700_read_signal_strength, | |
436 | .read_snr = cx22700_read_snr, | |
437 | .read_ucblocks = cx22700_read_ucblocks, | |
438 | }; | |
439 | ||
440 | module_param(debug, int, 0644); | |
441 | MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); | |
442 | ||
443 | MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver"); | |
444 | MODULE_AUTHOR("Holger Waechtler"); | |
445 | MODULE_LICENSE("GPL"); | |
446 | ||
447 | EXPORT_SYMBOL(cx22700_attach); |