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 | ||
76 | dprintk ("%s\n", __FUNCTION__); | |
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 | __FUNCTION__, 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", __FUNCTION__); | |
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", __FUNCTION__); | |
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", __FUNCTION__); | |
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) | |
91a07919 | 136 | return -EINVAL; |
1da177e4 LT |
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", __FUNCTION__); | |
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 | ||
b8742700 | 233 | { struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
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 | ||
1da177e4 LT |
248 | return 0; |
249 | } | |
250 | ||
251 | static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status) | |
252 | { | |
b8742700 | 253 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
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 | { | |
b8742700 | 281 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
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 | { | |
b8742700 | 291 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
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 | { | |
b8742700 | 302 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
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 | { | |
b8742700 | 313 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
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 | { | |
b8742700 | 323 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
324 | |
325 | cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/ | |
326 | cx22700_writereg (state, 0x00, 0x00); | |
327 | ||
dea74869 PB |
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); | |
5becb3b0 AQ |
331 | } |
332 | ||
1da177e4 LT |
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 | { | |
b8742700 | 343 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
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 | ||
5becb3b0 AQ |
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 | ||
1da177e4 LT |
361 | static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings) |
362 | { | |
9101e622 MCC |
363 | fesettings->min_delay_ms = 150; |
364 | fesettings->step_size = 166667; | |
365 | fesettings->max_drift = 166667*2; | |
366 | return 0; | |
1da177e4 LT |
367 | } |
368 | ||
369 | static void cx22700_release(struct dvb_frontend* fe) | |
370 | { | |
b8742700 | 371 | struct cx22700_state* state = fe->demodulator_priv; |
1da177e4 LT |
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 */ | |
b8742700 | 383 | state = kmalloc(sizeof(struct cx22700_state), GFP_KERNEL); |
1da177e4 LT |
384 | if (state == NULL) goto error; |
385 | ||
386 | /* setup the state */ | |
387 | state->config = config; | |
388 | state->i2c = i2c; | |
1da177e4 LT |
389 | |
390 | /* check if the demod is there */ | |
391 | if (cx22700_readreg(state, 0x07) < 0) goto error; | |
392 | ||
393 | /* create dvb_frontend */ | |
dea74869 | 394 | memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops)); |
1da177e4 LT |
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 | | |
9101e622 | 414 | FE_CAN_RECOVER |
1da177e4 LT |
415 | }, |
416 | ||
417 | .release = cx22700_release, | |
418 | ||
419 | .init = cx22700_init, | |
5becb3b0 | 420 | .i2c_gate_ctrl = cx22700_i2c_gate_ctrl, |
1da177e4 LT |
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); |