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1 | /* |
2 | * $Id: lgdt3302.c,v 1.2 2005/06/28 23:50:48 mkrufky Exp $ | |
3 | * | |
4 | * Support for LGDT3302 (DViCO FustionHDTV 3 Gold) - VSB/QAM | |
5 | * | |
6 | * Copyright (C) 2005 Wilson Michaels <wilsonmichaels@earthlink.net> | |
7 | * | |
8 | * Based on code from Kirk Lapray <kirk_lapray@bigfoot.com> | |
9 | * Copyright (C) 2005 | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | * | |
25 | */ | |
26 | ||
27 | /* | |
28 | * NOTES ABOUT THIS DRIVER | |
29 | * | |
30 | * This driver supports DViCO FusionHDTV 3 Gold under Linux. | |
31 | * | |
32 | * TODO: | |
33 | * BER and signal strength always return 0. | |
34 | * | |
35 | */ | |
36 | ||
37 | #include <linux/version.h> | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/module.h> | |
40 | #include <linux/moduleparam.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/delay.h> | |
43 | #include <asm/byteorder.h> | |
44 | ||
45 | #include "dvb_frontend.h" | |
46 | #include "dvb-pll.h" | |
47 | #include "lgdt3302_priv.h" | |
48 | #include "lgdt3302.h" | |
49 | ||
50 | static int debug = 0; | |
51 | module_param(debug, int, 0644); | |
52 | MODULE_PARM_DESC(debug,"Turn on/off lgdt3302 frontend debugging (default:off)."); | |
53 | #define dprintk(args...) \ | |
54 | do { \ | |
55 | if (debug) printk(KERN_DEBUG "lgdt3302: " args); \ | |
56 | } while (0) | |
57 | ||
58 | struct lgdt3302_state | |
59 | { | |
60 | struct i2c_adapter* i2c; | |
61 | struct dvb_frontend_ops ops; | |
62 | ||
63 | /* Configuration settings */ | |
64 | const struct lgdt3302_config* config; | |
65 | ||
66 | struct dvb_frontend frontend; | |
67 | ||
68 | /* Demodulator private data */ | |
69 | fe_modulation_t current_modulation; | |
70 | ||
71 | /* Tuner private data */ | |
72 | u32 current_frequency; | |
73 | }; | |
74 | ||
75 | static int i2c_writebytes (struct lgdt3302_state* state, | |
76 | u8 addr, /* demod_address or pll_address */ | |
77 | u8 *buf, /* data bytes to send */ | |
78 | int len /* number of bytes to send */ ) | |
79 | { | |
80 | if (addr == state->config->pll_address) { | |
81 | struct i2c_msg msg = | |
82 | { .addr = addr, .flags = 0, .buf = buf, .len = len }; | |
83 | int err; | |
84 | ||
85 | if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) { | |
86 | printk(KERN_WARNING "lgdt3302: %s error (addr %02x <- %02x, err == %i)\n", __FUNCTION__, addr, buf[0], err); | |
87 | return -EREMOTEIO; | |
88 | } | |
89 | } else { | |
90 | u8 tmp[] = { buf[0], buf[1] }; | |
91 | struct i2c_msg msg = | |
92 | { .addr = addr, .flags = 0, .buf = tmp, .len = 2 }; | |
93 | int err; | |
94 | int i; | |
95 | ||
96 | for (i=1; i<len; i++) { | |
97 | tmp[1] = buf[i]; | |
98 | if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) { | |
99 | printk(KERN_WARNING "lgdt3302: %s error (addr %02x <- %02x, err == %i)\n", __FUNCTION__, addr, buf[0], err); | |
100 | return -EREMOTEIO; | |
101 | } | |
102 | tmp[0]++; | |
103 | } | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | static int i2c_readbytes (struct lgdt3302_state* state, | |
108 | u8 addr, /* demod_address or pll_address */ | |
109 | u8 *buf, /* holds data bytes read */ | |
110 | int len /* number of bytes to read */ ) | |
111 | { | |
112 | struct i2c_msg msg = | |
113 | { .addr = addr, .flags = I2C_M_RD, .buf = buf, .len = len }; | |
114 | int err; | |
115 | ||
116 | if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) { | |
117 | printk(KERN_WARNING "lgdt3302: %s error (addr %02x, err == %i)\n", __FUNCTION__, addr, err); | |
118 | return -EREMOTEIO; | |
119 | } | |
120 | return 0; | |
121 | } | |
122 | ||
123 | /* | |
124 | * This routine writes the register (reg) to the demod bus | |
125 | * then reads the data returned for (len) bytes. | |
126 | */ | |
127 | ||
128 | static u8 i2c_selectreadbytes (struct lgdt3302_state* state, | |
129 | enum I2C_REG reg, u8* buf, int len) | |
130 | { | |
131 | u8 wr [] = { reg }; | |
132 | struct i2c_msg msg [] = { | |
133 | { .addr = state->config->demod_address, | |
134 | .flags = 0, .buf = wr, .len = 1 }, | |
135 | { .addr = state->config->demod_address, | |
136 | .flags = I2C_M_RD, .buf = buf, .len = len }, | |
137 | }; | |
138 | int ret; | |
139 | ret = i2c_transfer(state->i2c, msg, 2); | |
140 | if (ret != 2) { | |
141 | printk(KERN_WARNING "lgdt3302: %s: addr 0x%02x select 0x%02x error (ret == %i)\n", __FUNCTION__, state->config->demod_address, reg, ret); | |
142 | } else { | |
143 | ret = 0; | |
144 | } | |
145 | return ret; | |
146 | } | |
147 | ||
148 | /* Software reset */ | |
149 | int lgdt3302_SwReset(struct lgdt3302_state* state) | |
150 | { | |
151 | u8 ret; | |
152 | u8 reset[] = { | |
153 | IRQ_MASK, | |
154 | 0x00 /* bit 6 is active low software reset | |
155 | * bits 5-0 are 1 to mask interrupts */ | |
156 | }; | |
157 | ||
158 | ret = i2c_writebytes(state, | |
159 | state->config->demod_address, | |
160 | reset, sizeof(reset)); | |
161 | if (ret == 0) { | |
162 | /* spec says reset takes 100 ns why wait */ | |
163 | /* mdelay(100); */ /* keep low for 100mS */ | |
164 | reset[1] = 0x7f; /* force reset high (inactive) | |
165 | * and unmask interrupts */ | |
166 | ret = i2c_writebytes(state, | |
167 | state->config->demod_address, | |
168 | reset, sizeof(reset)); | |
169 | } | |
170 | /* Spec does not indicate a need for this either */ | |
171 | /*mdelay(5); */ /* wait 5 msec before doing more */ | |
172 | return ret; | |
173 | } | |
174 | ||
175 | static int lgdt3302_init(struct dvb_frontend* fe) | |
176 | { | |
177 | /* Hardware reset is done using gpio[0] of cx23880x chip. | |
178 | * I'd like to do it here, but don't know how to find chip address. | |
179 | * cx88-cards.c arranges for the reset bit to be inactive (high). | |
180 | * Maybe there needs to be a callable function in cx88-core or | |
181 | * the caller of this function needs to do it. */ | |
182 | ||
183 | dprintk("%s entered\n", __FUNCTION__); | |
184 | return lgdt3302_SwReset((struct lgdt3302_state*) fe->demodulator_priv); | |
185 | } | |
186 | ||
187 | static int lgdt3302_read_ber(struct dvb_frontend* fe, u32* ber) | |
188 | { | |
189 | *ber = 0; /* Dummy out for now */ | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static int lgdt3302_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks) | |
194 | { | |
195 | struct lgdt3302_state* state = (struct lgdt3302_state*) fe->demodulator_priv; | |
196 | u8 buf[2]; | |
197 | ||
198 | i2c_selectreadbytes(state, PACKET_ERR_COUNTER1, buf, sizeof(buf)); | |
199 | ||
200 | *ucblocks = (buf[0] << 8) | buf[1]; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int lgdt3302_set_parameters(struct dvb_frontend* fe, | |
205 | struct dvb_frontend_parameters *param) | |
206 | { | |
207 | u8 buf[4]; | |
208 | struct lgdt3302_state* state = | |
209 | (struct lgdt3302_state*) fe->demodulator_priv; | |
210 | ||
211 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,10) | |
212 | ||
213 | /* Use 50MHz parameter values from spec sheet since xtal is 50 */ | |
214 | static u8 top_ctrl_cfg[] = { TOP_CONTROL, 0x03 }; | |
215 | static u8 vsb_freq_cfg[] = { VSB_CARRIER_FREQ0, 0x00, 0x87, 0x8e, 0x01 }; | |
216 | static u8 demux_ctrl_cfg[] = { DEMUX_CONTROL, 0xfb }; | |
217 | static u8 agc_rf_cfg[] = { AGC_RF_BANDWIDTH0, 0x40, 0x93, 0x00 }; | |
218 | static u8 agc_ctrl_cfg[] = { AGC_FUNC_CTRL2, 0xc6, 0x40 }; | |
219 | static u8 agc_delay_cfg[] = { AGC_DELAY0, 0x00, 0x00, 0x00 }; | |
220 | static u8 agc_loop_cfg[] = { AGC_LOOP_BANDWIDTH0, 0x08, 0x9a }; | |
221 | ||
222 | /* Change only if we are actually changing the modulation */ | |
223 | if (state->current_modulation != param->u.vsb.modulation) { | |
224 | switch(param->u.vsb.modulation) { | |
225 | case VSB_8: | |
226 | dprintk("%s: VSB_8 MODE\n", __FUNCTION__); | |
227 | ||
228 | /* Select VSB mode and serial MPEG interface */ | |
229 | top_ctrl_cfg[1] = 0x07; | |
230 | break; | |
231 | ||
232 | case QAM_64: | |
233 | dprintk("%s: QAM_64 MODE\n", __FUNCTION__); | |
234 | ||
235 | /* Select QAM_64 mode and serial MPEG interface */ | |
236 | top_ctrl_cfg[1] = 0x04; | |
237 | break; | |
238 | ||
239 | case QAM_256: | |
240 | dprintk("%s: QAM_256 MODE\n", __FUNCTION__); | |
241 | ||
242 | /* Select QAM_256 mode and serial MPEG interface */ | |
243 | top_ctrl_cfg[1] = 0x05; | |
244 | break; | |
245 | default: | |
246 | printk(KERN_WARNING "lgdt3302: %s: Modulation type(%d) UNSUPPORTED\n", __FUNCTION__, param->u.vsb.modulation); | |
247 | return -1; | |
248 | } | |
249 | /* Initializations common to all modes */ | |
250 | ||
251 | /* Select the requested mode */ | |
252 | i2c_writebytes(state, state->config->demod_address, | |
253 | top_ctrl_cfg, sizeof(top_ctrl_cfg)); | |
254 | ||
255 | /* Change the value of IFBW[11:0] | |
256 | of AGC IF/RF loop filter bandwidth register */ | |
257 | i2c_writebytes(state, state->config->demod_address, | |
258 | agc_rf_cfg, sizeof(agc_rf_cfg)); | |
259 | ||
260 | /* Change the value of bit 6, 'nINAGCBY' and | |
261 | 'NSSEL[1:0] of ACG function control register 2 */ | |
262 | /* Change the value of bit 6 'RFFIX' | |
263 | of AGC function control register 3 */ | |
264 | i2c_writebytes(state, state->config->demod_address, | |
265 | agc_ctrl_cfg, sizeof(agc_ctrl_cfg)); | |
266 | ||
267 | /* Change the TPCLK pin polarity | |
268 | data is valid on falling clock */ | |
269 | i2c_writebytes(state, state->config->demod_address, | |
270 | demux_ctrl_cfg, sizeof(demux_ctrl_cfg)); | |
271 | ||
272 | if (param->u.vsb.modulation == VSB_8) { | |
273 | /* Initialization for VSB modes only */ | |
274 | /* Change the value of NCOCTFV[25:0]of carrier | |
275 | recovery center frequency register for VSB */ | |
276 | i2c_writebytes(state, state->config->demod_address, | |
277 | vsb_freq_cfg, sizeof(vsb_freq_cfg)); | |
278 | } else { | |
279 | /* Initialization for QAM modes only */ | |
280 | /* Set the value of 'INLVTHD' register 0x2a/0x2c | |
281 | to value from 'IFACC' register 0x39/0x3b -1 */ | |
282 | int value; | |
283 | i2c_selectreadbytes(state, AGC_RFIF_ACC0, | |
284 | &agc_delay_cfg[1], 3); | |
285 | value = ((agc_delay_cfg[1] & 0x0f) << 8) | agc_delay_cfg[3]; | |
286 | value = value -1; | |
287 | dprintk("%s IFACC -1 = 0x%03x\n", __FUNCTION__, value); | |
288 | agc_delay_cfg[1] = (value >> 8) & 0x0f; | |
289 | agc_delay_cfg[2] = 0x00; | |
290 | agc_delay_cfg[3] = value & 0xff; | |
291 | i2c_writebytes(state, state->config->demod_address, | |
292 | agc_delay_cfg, sizeof(agc_delay_cfg)); | |
293 | ||
294 | /* Change the value of IAGCBW[15:8] | |
295 | of inner AGC loop filter bandwith */ | |
296 | i2c_writebytes(state, state->config->demod_address, | |
297 | agc_loop_cfg, sizeof(agc_loop_cfg)); | |
298 | } | |
299 | ||
300 | state->config->set_ts_params(fe, 0); | |
301 | lgdt3302_SwReset(state); | |
302 | state->current_modulation = param->u.vsb.modulation; | |
303 | } | |
304 | #else | |
305 | printk("lgdt3302: %s: you need a newer kernel for this, sorry\n",__FUNCTION__); | |
306 | #endif | |
307 | ||
308 | /* Change only if we are actually changing the channel */ | |
309 | if (state->current_frequency != param->frequency) { | |
310 | dvb_pll_configure(state->config->pll_desc, buf, | |
311 | param->frequency, 0); | |
312 | dprintk("%s: tuner bytes: 0x%02x 0x%02x " | |
313 | "0x%02x 0x%02x\n", __FUNCTION__, buf[0],buf[1],buf[2],buf[3]); | |
314 | i2c_writebytes(state, state->config->pll_address ,buf, 4); | |
315 | ||
316 | /* Check the status of the tuner pll */ | |
317 | i2c_readbytes(state, state->config->pll_address, buf, 1); | |
318 | dprintk("%s: tuner status byte = 0x%02x\n", __FUNCTION__, buf[0]); | |
319 | ||
320 | lgdt3302_SwReset(state); | |
321 | ||
322 | /* Update current frequency */ | |
323 | state->current_frequency = param->frequency; | |
324 | } | |
325 | return 0; | |
326 | } | |
327 | ||
328 | static int lgdt3302_get_frontend(struct dvb_frontend* fe, | |
329 | struct dvb_frontend_parameters* param) | |
330 | { | |
331 | struct lgdt3302_state *state = fe->demodulator_priv; | |
332 | param->frequency = state->current_frequency; | |
333 | return 0; | |
334 | } | |
335 | ||
336 | static int lgdt3302_read_status(struct dvb_frontend* fe, fe_status_t* status) | |
337 | { | |
338 | struct lgdt3302_state* state = (struct lgdt3302_state*) fe->demodulator_priv; | |
339 | u8 buf[3]; | |
340 | ||
341 | *status = 0; /* Reset status result */ | |
342 | ||
343 | /* Check the status of the tuner pll */ | |
344 | i2c_readbytes(state, state->config->pll_address, buf, 1); | |
345 | dprintk("%s: tuner status byte = 0x%02x\n", __FUNCTION__, buf[0]); | |
346 | if ((buf[0] & 0xc0) != 0x40) | |
347 | return 0; /* Tuner PLL not locked or not powered on */ | |
348 | ||
349 | /* | |
350 | * You must set the Mask bits to 1 in the IRQ_MASK in order | |
351 | * to see that status bit in the IRQ_STATUS register. | |
352 | * This is done in SwReset(); | |
353 | */ | |
354 | ||
355 | /* signal status */ | |
356 | i2c_selectreadbytes(state, TOP_CONTROL, buf, sizeof(buf)); | |
357 | dprintk("%s: TOP_CONTROL = 0x%02x, IRO_MASK = 0x%02x, IRQ_STATUS = 0x%02x\n", __FUNCTION__, buf[0], buf[1], buf[2]); | |
358 | if ((buf[2] & 0x30) == 0x10) | |
359 | *status |= FE_HAS_SIGNAL; | |
360 | ||
361 | /* sync status */ | |
362 | if ((buf[2] & 0x03) == 0x01) { | |
363 | *status |= FE_HAS_SYNC; | |
364 | } | |
365 | ||
366 | /* FEC error status */ | |
367 | if ((buf[2] & 0x0c) == 0x08) { | |
368 | *status |= FE_HAS_LOCK; | |
369 | *status |= FE_HAS_VITERBI; | |
370 | } | |
371 | ||
372 | #if 0 | |
373 | /* Alternative method to check for a signal */ | |
374 | /* AGC status register */ | |
375 | i2c_selectreadbytes(state, AGC_STATUS, buf, 1); | |
376 | dprintk("%s: AGC_STATUS = 0x%02x\n", __FUNCTION__, buf[0]); | |
377 | if ((buf[0] & 0x0c) == 0x80) /* Test signal does not exist flag */ | |
378 | /* Test AGC lock flag */ | |
379 | *status |= FE_HAS_SIGNAL; | |
380 | else | |
381 | return 0; | |
382 | ||
383 | /* Carrier Recovery Lock Status Register */ | |
384 | i2c_selectreadbytes(state, CARRIER_LOCK, buf, 1); | |
385 | dprintk("%s: CARRIER_LOCK = 0x%02x\n", __FUNCTION__, buf[0]); | |
386 | switch (state->current_modulation) { | |
387 | case QAM_256: | |
388 | case QAM_64: | |
389 | /* Need to undestand why there are 3 lock levels here */ | |
390 | if ((buf[0] & 0x07) == 0x07) | |
391 | *status |= FE_HAS_CARRIER; | |
392 | else | |
393 | return 0; | |
394 | break; | |
395 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,10) | |
396 | case VSB_8: | |
397 | if ((buf[0] & 0x80) == 0x80) | |
398 | *status |= FE_HAS_CARRIER; | |
399 | else | |
400 | return 0; | |
401 | break; | |
402 | #endif | |
403 | default: | |
404 | printk("KERN_WARNING lgdt3302: %s: Modulation set to unsupported value\n", __FUNCTION__); | |
405 | } | |
406 | #endif | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
411 | static int lgdt3302_read_signal_strength(struct dvb_frontend* fe, u16* strength) | |
412 | { | |
413 | /* not directly available. */ | |
414 | return 0; | |
415 | } | |
416 | ||
417 | static int lgdt3302_read_snr(struct dvb_frontend* fe, u16* snr) | |
418 | { | |
419 | #ifdef SNR_IN_DB | |
420 | /* | |
421 | * Spec sheet shows formula for SNR_EQ = 10 log10(25 * 24**2 / noise) | |
422 | * and SNR_PH = 10 log10(25 * 32**2 / noise) for equalizer and phase tracker | |
423 | * respectively. The following tables are built on these formulas. | |
424 | * The usual definition is SNR = 20 log10(signal/noise) | |
425 | * If the specification is wrong the value retuned is 1/2 the actual SNR in db. | |
426 | * | |
427 | * This table is a an ordered list of noise values computed by the | |
428 | * formula from the spec sheet such that the index into the table | |
429 | * starting at 43 or 45 is the SNR value in db. There are duplicate noise | |
430 | * value entries at the beginning because the SNR varies more than | |
431 | * 1 db for a change of 1 digit in noise at very small values of noise. | |
432 | * | |
433 | * Examples from SNR_EQ table: | |
434 | * noise SNR | |
435 | * 0 43 | |
436 | * 1 42 | |
437 | * 2 39 | |
438 | * 3 37 | |
439 | * 4 36 | |
440 | * 5 35 | |
441 | * 6 34 | |
442 | * 7 33 | |
443 | * 8 33 | |
444 | * 9 32 | |
445 | * 10 32 | |
446 | * 11 31 | |
447 | * 12 31 | |
448 | * 13 30 | |
449 | */ | |
450 | ||
451 | static const u32 SNR_EQ[] = | |
452 | { 1, 2, 2, 2, 3, 3, 4, 4, 5, 7, | |
453 | 9, 11, 13, 17, 21, 26, 33, 41, 52, 65, | |
454 | 81, 102, 129, 162, 204, 257, 323, 406, 511, 644, | |
455 | 810, 1020, 1284, 1616, 2035, 2561, 3224, 4059, 5110, 6433, | |
456 | 8098, 10195, 12835, 16158, 20341, 25608, 32238, 40585, 51094, 64323, | |
457 | 80978, 101945, 128341, 161571, 203406, 256073, 0x40000 | |
458 | }; | |
459 | ||
460 | static const u32 SNR_PH[] = | |
461 | { 1, 2, 2, 2, 3, 3, 4, 5, 6, 8, | |
462 | 10, 12, 15, 19, 23, 29, 37, 46, 58, 73, | |
463 | 91, 115, 144, 182, 229, 288, 362, 456, 574, 722, | |
464 | 909, 1144, 1440, 1813, 2282, 2873, 3617, 4553, 5732, 7216, | |
465 | 9084, 11436, 14396, 18124, 22817, 28724, 36161, 45524, 57312, 72151, | |
466 | 90833, 114351, 143960, 181235, 228161, 0x040000 | |
467 | }; | |
468 | ||
469 | static u8 buf[5];/* read data buffer */ | |
470 | static u32 noise; /* noise value */ | |
471 | static u32 snr_db; /* index into SNR_EQ[] */ | |
472 | struct lgdt3302_state* state = (struct lgdt3302_state*) fe->demodulator_priv; | |
473 | ||
474 | /* read both equalizer and pase tracker noise data */ | |
475 | i2c_selectreadbytes(state, EQPH_ERR0, buf, sizeof(buf)); | |
476 | ||
477 | if (state->current_modulation == VSB_8) { | |
478 | /* Equalizer Mean-Square Error Register for VSB */ | |
479 | noise = ((buf[0] & 7) << 16) | (buf[1] << 8) | buf[2]; | |
480 | ||
481 | /* | |
482 | * Look up noise value in table. | |
483 | * A better search algorithm could be used... | |
484 | * watch out there are duplicate entries. | |
485 | */ | |
486 | for (snr_db = 0; snr_db < sizeof(SNR_EQ); snr_db++) { | |
487 | if (noise < SNR_EQ[snr_db]) { | |
488 | *snr = 43 - snr_db; | |
489 | break; | |
490 | } | |
491 | } | |
492 | } else { | |
493 | /* Phase Tracker Mean-Square Error Register for QAM */ | |
494 | noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4]; | |
495 | ||
496 | /* Look up noise value in table. */ | |
497 | for (snr_db = 0; snr_db < sizeof(SNR_PH); snr_db++) { | |
498 | if (noise < SNR_PH[snr_db]) { | |
499 | *snr = 45 - snr_db; | |
500 | break; | |
501 | } | |
502 | } | |
503 | } | |
504 | #else | |
505 | /* Return the raw noise value */ | |
506 | static u8 buf[5];/* read data buffer */ | |
507 | static u32 noise; /* noise value */ | |
508 | struct lgdt3302_state* state = (struct lgdt3302_state*) fe->demodulator_priv; | |
509 | ||
510 | /* read both equalizer and pase tracker noise data */ | |
511 | i2c_selectreadbytes(state, EQPH_ERR0, buf, sizeof(buf)); | |
512 | ||
513 | if (state->current_modulation == VSB_8) { | |
514 | /* Equalizer Mean-Square Error Register for VSB */ | |
515 | noise = ((buf[0] & 7) << 16) | (buf[1] << 8) | buf[2]; | |
516 | } else { | |
517 | /* Phase Tracker Mean-Square Error Register for QAM */ | |
518 | noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4]; | |
519 | } | |
520 | ||
521 | /* Small values for noise mean signal is better so invert noise */ | |
522 | /* Noise is 19 bit value so discard 3 LSB*/ | |
523 | *snr = ~noise>>3; | |
524 | #endif | |
525 | ||
526 | dprintk("%s: noise = 0x%05x, snr = %idb\n",__FUNCTION__, noise, *snr); | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | static int lgdt3302_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings) | |
532 | { | |
533 | /* I have no idea about this - it may not be needed */ | |
534 | fe_tune_settings->min_delay_ms = 500; | |
535 | fe_tune_settings->step_size = 0; | |
536 | fe_tune_settings->max_drift = 0; | |
537 | return 0; | |
538 | } | |
539 | ||
540 | static void lgdt3302_release(struct dvb_frontend* fe) | |
541 | { | |
542 | struct lgdt3302_state* state = (struct lgdt3302_state*) fe->demodulator_priv; | |
543 | kfree(state); | |
544 | } | |
545 | ||
546 | static struct dvb_frontend_ops lgdt3302_ops; | |
547 | ||
548 | struct dvb_frontend* lgdt3302_attach(const struct lgdt3302_config* config, | |
549 | struct i2c_adapter* i2c) | |
550 | { | |
551 | struct lgdt3302_state* state = NULL; | |
552 | u8 buf[1]; | |
553 | ||
554 | /* Allocate memory for the internal state */ | |
555 | state = (struct lgdt3302_state*) kmalloc(sizeof(struct lgdt3302_state), GFP_KERNEL); | |
556 | if (state == NULL) | |
557 | goto error; | |
558 | memset(state,0,sizeof(*state)); | |
559 | ||
560 | /* Setup the state */ | |
561 | state->config = config; | |
562 | state->i2c = i2c; | |
563 | memcpy(&state->ops, &lgdt3302_ops, sizeof(struct dvb_frontend_ops)); | |
564 | /* Verify communication with demod chip */ | |
565 | if (i2c_selectreadbytes(state, 2, buf, 1)) | |
566 | goto error; | |
567 | ||
568 | state->current_frequency = -1; | |
569 | state->current_modulation = -1; | |
570 | ||
571 | /* Create dvb_frontend */ | |
572 | state->frontend.ops = &state->ops; | |
573 | state->frontend.demodulator_priv = state; | |
574 | return &state->frontend; | |
575 | ||
576 | error: | |
577 | if (state) | |
578 | kfree(state); | |
579 | dprintk("%s: ERROR\n",__FUNCTION__); | |
580 | return NULL; | |
581 | } | |
582 | ||
583 | static struct dvb_frontend_ops lgdt3302_ops = { | |
584 | .info = { | |
585 | .name= "LG Electronics LGDT3302 VSB/QAM Frontend", | |
586 | .type = FE_ATSC, | |
587 | .frequency_min= 54000000, | |
588 | .frequency_max= 858000000, | |
589 | .frequency_stepsize= 62500, | |
590 | /* Symbol rate is for all VSB modes need to check QAM */ | |
591 | .symbol_rate_min = 10762000, | |
592 | .symbol_rate_max = 10762000, | |
593 | .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB | |
594 | }, | |
595 | .init = lgdt3302_init, | |
596 | .set_frontend = lgdt3302_set_parameters, | |
597 | .get_frontend = lgdt3302_get_frontend, | |
598 | .get_tune_settings = lgdt3302_get_tune_settings, | |
599 | .read_status = lgdt3302_read_status, | |
600 | .read_ber = lgdt3302_read_ber, | |
601 | .read_signal_strength = lgdt3302_read_signal_strength, | |
602 | .read_snr = lgdt3302_read_snr, | |
603 | .read_ucblocks = lgdt3302_read_ucblocks, | |
604 | .release = lgdt3302_release, | |
605 | }; | |
606 | ||
607 | MODULE_DESCRIPTION("LGDT3302 [DViCO FusionHDTV 3 Gold] (ATSC 8VSB & ITU-T J.83 AnnexB 64/256 QAM) Demodulator Driver"); | |
608 | MODULE_AUTHOR("Wilson Michaels"); | |
609 | MODULE_LICENSE("GPL"); | |
610 | ||
611 | EXPORT_SYMBOL(lgdt3302_attach); | |
612 | ||
613 | /* | |
614 | * Local variables: | |
615 | * c-basic-offset: 8 | |
616 | * compile-command: "make DVB=1" | |
617 | * End: | |
618 | */ |