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