drivers/media/dvb-frontends/au8522_dig.c - third_party/linux - Git at Google

 /*
     Auvitek AU8522 QAM/8VSB demodulator driver

     Copyright (C) 2008 Steven Toth <stoth@linuxtv.org>

     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.

     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/delay.h>
 #include <media/dvb_frontend.h>
 #include "au8522.h"
 #include "au8522_priv.h"

 static int debug;
 static int zv_mode = 1; /* default to on */

 #define dprintk(arg...)\
 	do { if (debug)\
 		printk(arg);\
 	} while (0)

 struct mse2snr_tab {
 	u16 val;
 	u16 data;
 };

 /* VSB SNR lookup table */
 static struct mse2snr_tab vsb_mse2snr_tab[] = {
 	{   0, 270 },
 	{   2, 250 },
 	{   3, 240 },
 	{   5, 230 },
 	{   7, 220 },
 	{   9, 210 },
 	{  12, 200 },
 	{  13, 195 },
 	{  15, 190 },
 	{  17, 185 },
 	{  19, 180 },
 	{  21, 175 },
 	{  24, 170 },
 	{  27, 165 },
 	{  31, 160 },
 	{  32, 158 },
 	{  33, 156 },
 	{  36, 152 },
 	{  37, 150 },
 	{  39, 148 },
 	{  40, 146 },
 	{  41, 144 },
 	{  43, 142 },
 	{  44, 140 },
 	{  48, 135 },
 	{  50, 130 },
 	{  43, 142 },
 	{  53, 125 },
 	{  56, 120 },
 	{ 256, 115 },
 };

 /* QAM64 SNR lookup table */
 static struct mse2snr_tab qam64_mse2snr_tab[] = {
 	{  15,   0 },
 	{  16, 290 },
 	{  17, 288 },
 	{  18, 286 },
 	{  19, 284 },
 	{  20, 282 },
 	{  21, 281 },
 	{  22, 279 },
 	{  23, 277 },
 	{  24, 275 },
 	{  25, 273 },
 	{  26, 271 },
 	{  27, 269 },
 	{  28, 268 },
 	{  29, 266 },
 	{  30, 264 },
 	{  31, 262 },
 	{  32, 260 },
 	{  33, 259 },
 	{  34, 258 },
 	{  35, 256 },
 	{  36, 255 },
 	{  37, 254 },
 	{  38, 252 },
 	{  39, 251 },
 	{  40, 250 },
 	{  41, 249 },
 	{  42, 248 },
 	{  43, 246 },
 	{  44, 245 },
 	{  45, 244 },
 	{  46, 242 },
 	{  47, 241 },
 	{  48, 240 },
 	{  50, 239 },
 	{  51, 238 },
 	{  53, 237 },
 	{  54, 236 },
 	{  56, 235 },
 	{  57, 234 },
 	{  59, 233 },
 	{  60, 232 },
 	{  62, 231 },
 	{  63, 230 },
 	{  65, 229 },
 	{  67, 228 },
 	{  68, 227 },
 	{  70, 226 },
 	{  71, 225 },
 	{  73, 224 },
 	{  74, 223 },
 	{  76, 222 },
 	{  78, 221 },
 	{  80, 220 },
 	{  82, 219 },
 	{  85, 218 },
 	{  88, 217 },
 	{  90, 216 },
 	{  92, 215 },
 	{  93, 214 },
 	{  94, 212 },
 	{  95, 211 },
 	{  97, 210 },
 	{  99, 209 },
 	{ 101, 208 },
 	{ 102, 207 },
 	{ 104, 206 },
 	{ 107, 205 },
 	{ 111, 204 },
 	{ 114, 203 },
 	{ 118, 202 },
 	{ 122, 201 },
 	{ 125, 200 },
 	{ 128, 199 },
 	{ 130, 198 },
 	{ 132, 197 },
 	{ 256, 190 },
 };

 /* QAM256 SNR lookup table */
 static struct mse2snr_tab qam256_mse2snr_tab[] = {
 	{  15,   0 },
 	{  16, 400 },
 	{  17, 398 },
 	{  18, 396 },
 	{  19, 394 },
 	{  20, 392 },
 	{  21, 390 },
 	{  22, 388 },
 	{  23, 386 },
 	{  24, 384 },
 	{  25, 382 },
 	{  26, 380 },
 	{  27, 379 },
 	{  28, 378 },
 	{  29, 377 },
 	{  30, 376 },
 	{  31, 375 },
 	{  32, 374 },
 	{  33, 373 },
 	{  34, 372 },
 	{  35, 371 },
 	{  36, 370 },
 	{  37, 362 },
 	{  38, 354 },
 	{  39, 346 },
 	{  40, 338 },
 	{  41, 330 },
 	{  42, 328 },
 	{  43, 326 },
 	{  44, 324 },
 	{  45, 322 },
 	{  46, 320 },
 	{  47, 319 },
 	{  48, 318 },
 	{  49, 317 },
 	{  50, 316 },
 	{  51, 315 },
 	{  52, 314 },
 	{  53, 313 },
 	{  54, 312 },
 	{  55, 311 },
 	{  56, 310 },
 	{  57, 308 },
 	{  58, 306 },
 	{  59, 304 },
 	{  60, 302 },
 	{  61, 300 },
 	{  62, 298 },
 	{  65, 295 },
 	{  68, 294 },
 	{  70, 293 },
 	{  73, 292 },
 	{  76, 291 },
 	{  78, 290 },
 	{  79, 289 },
 	{  81, 288 },
 	{  82, 287 },
 	{  83, 286 },
 	{  84, 285 },
 	{  85, 284 },
 	{  86, 283 },
 	{  88, 282 },
 	{  89, 281 },
 	{ 256, 280 },
 };

 static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
 				 u16 *snr)
 {
 	int i, ret = -EINVAL;
 	dprintk("%s()\n", __func__);

 	for (i = 0; i < sz; i++) {
 		if (mse < tab[i].val) {
 			*snr = tab[i].data;
 			ret = 0;
 			break;
 		}
 	}
 	dprintk("%s() snr=%d\n", __func__, *snr);
 	return ret;
 }

 static int au8522_set_if(struct dvb_frontend *fe, enum au8522_if_freq if_freq)
 {
 	struct au8522_state *state = fe->demodulator_priv;
 	u8 r0b5, r0b6, r0b7;
 	char *ifmhz;

 	switch (if_freq) {
 	case AU8522_IF_3_25MHZ:
 		ifmhz = "3.25";
 		r0b5 = 0x00;
 		r0b6 = 0x3d;
 		r0b7 = 0xa0;
 		break;
 	case AU8522_IF_4MHZ:
 		ifmhz = "4.00";
 		r0b5 = 0x00;
 		r0b6 = 0x4b;
 		r0b7 = 0xd9;
 		break;
 	case AU8522_IF_6MHZ:
 		ifmhz = "6.00";
 		r0b5 = 0xfb;
 		r0b6 = 0x8e;
 		r0b7 = 0x39;
 		break;
 	default:
 		dprintk("%s() IF Frequency not supported\n", __func__);
 		return -EINVAL;
 	}
 	dprintk("%s() %s MHz\n", __func__, ifmhz);
 	au8522_writereg(state, 0x00b5, r0b5);
 	au8522_writereg(state, 0x00b6, r0b6);
 	au8522_writereg(state, 0x00b7, r0b7);

 	return 0;
 }

 /* VSB Modulation table */
 static struct {
 	u16 reg;
 	u16 data;
 } VSB_mod_tab[] = {
 	{ 0x0090, 0x84 },
 	{ 0x2005, 0x00 },
 	{ 0x0091, 0x80 },
 	{ 0x00a3, 0x0c },
 	{ 0x00a4, 0xe8 },
 	{ 0x0081, 0xc4 },
 	{ 0x00a5, 0x40 },
 	{ 0x00a7, 0x40 },
 	{ 0x00a6, 0x67 },
 	{ 0x0262, 0x20 },
 	{ 0x021c, 0x30 },
 	{ 0x00d8, 0x1a },
 	{ 0x0227, 0xa0 },
 	{ 0x0121, 0xff },
 	{ 0x00a8, 0xf0 },
 	{ 0x00a9, 0x05 },
 	{ 0x00aa, 0x77 },
 	{ 0x00ab, 0xf0 },
 	{ 0x00ac, 0x05 },
 	{ 0x00ad, 0x77 },
 	{ 0x00ae, 0x41 },
 	{ 0x00af, 0x66 },
 	{ 0x021b, 0xcc },
 	{ 0x021d, 0x80 },
 	{ 0x00a4, 0xe8 },
 	{ 0x0231, 0x13 },
 };

 /* QAM64 Modulation table */
 static struct {
 	u16 reg;
 	u16 data;
 } QAM64_mod_tab[] = {
 	{ 0x00a3, 0x09 },
 	{ 0x00a4, 0x00 },
 	{ 0x0081, 0xc4 },
 	{ 0x00a5, 0x40 },
 	{ 0x00aa, 0x77 },
 	{ 0x00ad, 0x77 },
 	{ 0x00a6, 0x67 },
 	{ 0x0262, 0x20 },
 	{ 0x021c, 0x30 },
 	{ 0x00b8, 0x3e },
 	{ 0x00b9, 0xf0 },
 	{ 0x00ba, 0x01 },
 	{ 0x00bb, 0x18 },
 	{ 0x00bc, 0x50 },
 	{ 0x00bd, 0x00 },
 	{ 0x00be, 0xea },
 	{ 0x00bf, 0xef },
 	{ 0x00c0, 0xfc },
 	{ 0x00c1, 0xbd },
 	{ 0x00c2, 0x1f },
 	{ 0x00c3, 0xfc },
 	{ 0x00c4, 0xdd },
 	{ 0x00c5, 0xaf },
 	{ 0x00c6, 0x00 },
 	{ 0x00c7, 0x38 },
 	{ 0x00c8, 0x30 },
 	{ 0x00c9, 0x05 },
 	{ 0x00ca, 0x4a },
 	{ 0x00cb, 0xd0 },
 	{ 0x00cc, 0x01 },
 	{ 0x00cd, 0xd9 },
 	{ 0x00ce, 0x6f },
 	{ 0x00cf, 0xf9 },
 	{ 0x00d0, 0x70 },
 	{ 0x00d1, 0xdf },
 	{ 0x00d2, 0xf7 },
 	{ 0x00d3, 0xc2 },
 	{ 0x00d4, 0xdf },
 	{ 0x00d5, 0x02 },
 	{ 0x00d6, 0x9a },
 	{ 0x00d7, 0xd0 },
 	{ 0x0250, 0x0d },
 	{ 0x0251, 0xcd },
 	{ 0x0252, 0xe0 },
 	{ 0x0253, 0x05 },
 	{ 0x0254, 0xa7 },
 	{ 0x0255, 0xff },
 	{ 0x0256, 0xed },
 	{ 0x0257, 0x5b },
 	{ 0x0258, 0xae },
 	{ 0x0259, 0xe6 },
 	{ 0x025a, 0x3d },
 	{ 0x025b, 0x0f },
 	{ 0x025c, 0x0d },
 	{ 0x025d, 0xea },
 	{ 0x025e, 0xf2 },
 	{ 0x025f, 0x51 },
 	{ 0x0260, 0xf5 },
 	{ 0x0261, 0x06 },
 	{ 0x021a, 0x00 },
 	{ 0x0546, 0x40 },
 	{ 0x0210, 0xc7 },
 	{ 0x0211, 0xaa },
 	{ 0x0212, 0xab },
 	{ 0x0213, 0x02 },
 	{ 0x0502, 0x00 },
 	{ 0x0121, 0x04 },
 	{ 0x0122, 0x04 },
 	{ 0x052e, 0x10 },
 	{ 0x00a4, 0xca },
 	{ 0x00a7, 0x40 },
 	{ 0x0526, 0x01 },
 };

 /* QAM256 Modulation table */
 static struct {
 	u16 reg;
 	u16 data;
 } QAM256_mod_tab[] = {
 	{ 0x00a3, 0x09 },
 	{ 0x00a4, 0x00 },
 	{ 0x0081, 0xc4 },
 	{ 0x00a5, 0x40 },
 	{ 0x00aa, 0x77 },
 	{ 0x00ad, 0x77 },
 	{ 0x00a6, 0x67 },
 	{ 0x0262, 0x20 },
 	{ 0x021c, 0x30 },
 	{ 0x00b8, 0x3e },
 	{ 0x00b9, 0xf0 },
 	{ 0x00ba, 0x01 },
 	{ 0x00bb, 0x18 },
 	{ 0x00bc, 0x50 },
 	{ 0x00bd, 0x00 },
 	{ 0x00be, 0xea },
 	{ 0x00bf, 0xef },
 	{ 0x00c0, 0xfc },
 	{ 0x00c1, 0xbd },
 	{ 0x00c2, 0x1f },
 	{ 0x00c3, 0xfc },
 	{ 0x00c4, 0xdd },
 	{ 0x00c5, 0xaf },
 	{ 0x00c6, 0x00 },
 	{ 0x00c7, 0x38 },
 	{ 0x00c8, 0x30 },
 	{ 0x00c9, 0x05 },
 	{ 0x00ca, 0x4a },
 	{ 0x00cb, 0xd0 },
 	{ 0x00cc, 0x01 },
 	{ 0x00cd, 0xd9 },
 	{ 0x00ce, 0x6f },
 	{ 0x00cf, 0xf9 },
 	{ 0x00d0, 0x70 },
 	{ 0x00d1, 0xdf },
 	{ 0x00d2, 0xf7 },
 	{ 0x00d3, 0xc2 },
 	{ 0x00d4, 0xdf },
 	{ 0x00d5, 0x02 },
 	{ 0x00d6, 0x9a },
 	{ 0x00d7, 0xd0 },
 	{ 0x0250, 0x0d },
 	{ 0x0251, 0xcd },
 	{ 0x0252, 0xe0 },
 	{ 0x0253, 0x05 },
 	{ 0x0254, 0xa7 },
 	{ 0x0255, 0xff },
 	{ 0x0256, 0xed },
 	{ 0x0257, 0x5b },
 	{ 0x0258, 0xae },
 	{ 0x0259, 0xe6 },
 	{ 0x025a, 0x3d },
 	{ 0x025b, 0x0f },
 	{ 0x025c, 0x0d },
 	{ 0x025d, 0xea },
 	{ 0x025e, 0xf2 },
 	{ 0x025f, 0x51 },
 	{ 0x0260, 0xf5 },
 	{ 0x0261, 0x06 },
 	{ 0x021a, 0x00 },
 	{ 0x0546, 0x40 },
 	{ 0x0210, 0x26 },
 	{ 0x0211, 0xf6 },
 	{ 0x0212, 0x84 },
 	{ 0x0213, 0x02 },
 	{ 0x0502, 0x01 },
 	{ 0x0121, 0x04 },
 	{ 0x0122, 0x04 },
 	{ 0x052e, 0x10 },
 	{ 0x00a4, 0xca },
 	{ 0x00a7, 0x40 },
 	{ 0x0526, 0x01 },
 };

 static struct {
 	u16 reg;
 	u16 data;
 } QAM256_mod_tab_zv_mode[] = {
 	{ 0x80a3, 0x09 },
 	{ 0x80a4, 0x00 },
 	{ 0x8081, 0xc4 },
 	{ 0x80a5, 0x40 },
 	{ 0x80b5, 0xfb },
 	{ 0x80b6, 0x8e },
 	{ 0x80b7, 0x39 },
 	{ 0x80aa, 0x77 },
 	{ 0x80ad, 0x77 },
 	{ 0x80a6, 0x67 },
 	{ 0x8262, 0x20 },
 	{ 0x821c, 0x30 },
 	{ 0x80b8, 0x3e },
 	{ 0x80b9, 0xf0 },
 	{ 0x80ba, 0x01 },
 	{ 0x80bb, 0x18 },
 	{ 0x80bc, 0x50 },
 	{ 0x80bd, 0x00 },
 	{ 0x80be, 0xea },
 	{ 0x80bf, 0xef },
 	{ 0x80c0, 0xfc },
 	{ 0x80c1, 0xbd },
 	{ 0x80c2, 0x1f },
 	{ 0x80c3, 0xfc },
 	{ 0x80c4, 0xdd },
 	{ 0x80c5, 0xaf },
 	{ 0x80c6, 0x00 },
 	{ 0x80c7, 0x38 },
 	{ 0x80c8, 0x30 },
 	{ 0x80c9, 0x05 },
 	{ 0x80ca, 0x4a },
 	{ 0x80cb, 0xd0 },
 	{ 0x80cc, 0x01 },
 	{ 0x80cd, 0xd9 },
 	{ 0x80ce, 0x6f },
 	{ 0x80cf, 0xf9 },
 	{ 0x80d0, 0x70 },
 	{ 0x80d1, 0xdf },
 	{ 0x80d2, 0xf7 },
 	{ 0x80d3, 0xc2 },
 	{ 0x80d4, 0xdf },
 	{ 0x80d5, 0x02 },
 	{ 0x80d6, 0x9a },
 	{ 0x80d7, 0xd0 },
 	{ 0x8250, 0x0d },
 	{ 0x8251, 0xcd },
 	{ 0x8252, 0xe0 },
 	{ 0x8253, 0x05 },
 	{ 0x8254, 0xa7 },
 	{ 0x8255, 0xff },
 	{ 0x8256, 0xed },
 	{ 0x8257, 0x5b },
 	{ 0x8258, 0xae },
 	{ 0x8259, 0xe6 },
 	{ 0x825a, 0x3d },
 	{ 0x825b, 0x0f },
 	{ 0x825c, 0x0d },
 	{ 0x825d, 0xea },
 	{ 0x825e, 0xf2 },
 	{ 0x825f, 0x51 },
 	{ 0x8260, 0xf5 },
 	{ 0x8261, 0x06 },
 	{ 0x821a, 0x01 },
 	{ 0x8546, 0x40 },
 	{ 0x8210, 0x26 },
 	{ 0x8211, 0xf6 },
 	{ 0x8212, 0x84 },
 	{ 0x8213, 0x02 },
 	{ 0x8502, 0x01 },
 	{ 0x8121, 0x04 },
 	{ 0x8122, 0x04 },
 	{ 0x852e, 0x10 },
 	{ 0x80a4, 0xca },
 	{ 0x80a7, 0x40 },
 	{ 0x8526, 0x01 },
 };

 static int au8522_enable_modulation(struct dvb_frontend *fe,
 				    enum fe_modulation m)
 {
 	struct au8522_state *state = fe->demodulator_priv;
 	int i;

 	dprintk("%s(0x%08x)\n", __func__, m);

 	switch (m) {
 	case VSB_8:
 		dprintk("%s() VSB_8\n", __func__);
 		for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
 			au8522_writereg(state,
 				VSB_mod_tab[i].reg,
 				VSB_mod_tab[i].data);
 		au8522_set_if(fe, state->config.vsb_if);
 		break;
 	case QAM_64:
 		dprintk("%s() QAM 64\n", __func__);
 		for (i = 0; i < ARRAY_SIZE(QAM64_mod_tab); i++)
 			au8522_writereg(state,
 				QAM64_mod_tab[i].reg,
 				QAM64_mod_tab[i].data);
 		au8522_set_if(fe, state->config.qam_if);
 		break;
 	case QAM_256:
 		if (zv_mode) {
 			dprintk("%s() QAM 256 (zv_mode)\n", __func__);
 			for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab_zv_mode); i++)
 				au8522_writereg(state,
 					QAM256_mod_tab_zv_mode[i].reg,
 					QAM256_mod_tab_zv_mode[i].data);
 			au8522_set_if(fe, state->config.qam_if);
 			msleep(100);
 			au8522_writereg(state, 0x821a, 0x00);
 		} else {
 			dprintk("%s() QAM 256\n", __func__);
 			for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab); i++)
 				au8522_writereg(state,
 					QAM256_mod_tab[i].reg,
 					QAM256_mod_tab[i].data);
 			au8522_set_if(fe, state->config.qam_if);
 		}
 		break;
 	default:
 		dprintk("%s() Invalid modulation\n", __func__);
 		return -EINVAL;
 	}

 	state->current_modulation = m;

 	return 0;
 }

 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 static int au8522_set_frontend(struct dvb_frontend *fe)
 {
 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 	struct au8522_state *state = fe->demodulator_priv;
 	int ret = -EINVAL;

 	dprintk("%s(frequency=%d)\n", __func__, c->frequency);

 	if ((state->current_frequency == c->frequency) &&
 	    (state->current_modulation == c->modulation))
 		return 0;

 	if (fe->ops.tuner_ops.set_params) {
 		if (fe->ops.i2c_gate_ctrl)
 			fe->ops.i2c_gate_ctrl(fe, 1);
 		ret = fe->ops.tuner_ops.set_params(fe);
 		if (fe->ops.i2c_gate_ctrl)
 			fe->ops.i2c_gate_ctrl(fe, 0);
 	}

 	if (ret < 0)
 		return ret;

 	/* Allow the tuner to settle */
 	if (zv_mode) {
 		dprintk("%s() increase tuner settling time for zv_mode\n",
 			__func__);
 		msleep(250);
 	} else
 		msleep(100);

 	au8522_enable_modulation(fe, c->modulation);

 	state->current_frequency = c->frequency;

 	return 0;
 }

 static int au8522_read_status(struct dvb_frontend *fe, enum fe_status *status)
 {
 	struct au8522_state *state = fe->demodulator_priv;
 	u8 reg;
 	u32 tuner_status = 0;

 	*status = 0;

 	if (state->current_modulation == VSB_8) {
 		dprintk("%s() Checking VSB_8\n", __func__);
 		reg = au8522_readreg(state, 0x0088);
 		if ((reg & 0x03) == 0x03)
 			*status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
 	} else {
 		dprintk("%s() Checking QAM\n", __func__);
 		reg = au8522_readreg(state, 0x0541);
 		if (reg & 0x80)
 			*status |= FE_HAS_VITERBI;
 		if (reg & 0x20)
 			*status |= FE_HAS_LOCK | FE_HAS_SYNC;
 	}

 	switch (state->config.status_mode) {
 	case AU8522_DEMODLOCKING:
 		dprintk("%s() DEMODLOCKING\n", __func__);
 		if (*status & FE_HAS_VITERBI)
 			*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 		break;
 	case AU8522_TUNERLOCKING:
 		/* Get the tuner status */
 		dprintk("%s() TUNERLOCKING\n", __func__);
 		if (fe->ops.tuner_ops.get_status) {
 			if (fe->ops.i2c_gate_ctrl)
 				fe->ops.i2c_gate_ctrl(fe, 1);

 			fe->ops.tuner_ops.get_status(fe, &tuner_status);

 			if (fe->ops.i2c_gate_ctrl)
 				fe->ops.i2c_gate_ctrl(fe, 0);
 		}
 		if (tuner_status)
 			*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 		break;
 	}
 	state->fe_status = *status;

 	if (*status & FE_HAS_LOCK)
 		/* turn on LED, if it isn't on already */
 		au8522_led_ctrl(state, -1);
 	else
 		/* turn off LED */
 		au8522_led_ctrl(state, 0);

 	dprintk("%s() status 0x%08x\n", __func__, *status);

 	return 0;
 }

 static int au8522_led_status(struct au8522_state *state, const u16 *snr)
 {
 	struct au8522_led_config *led_config = state->config.led_cfg;
 	int led;
 	u16 strong;

 	/* bail out if we can't control an LED */
 	if (!led_config)
 		return 0;

 	if (0 == (state->fe_status & FE_HAS_LOCK))
 		return au8522_led_ctrl(state, 0);
 	else if (state->current_modulation == QAM_256)
 		strong = led_config->qam256_strong;
 	else if (state->current_modulation == QAM_64)
 		strong = led_config->qam64_strong;
 	else /* (state->current_modulation == VSB_8) */
 		strong = led_config->vsb8_strong;

 	if (*snr >= strong)
 		led = 2;
 	else
 		led = 1;

 	if ((state->led_state) &&
 	    (((strong < *snr) ? (*snr - strong) : (strong - *snr)) <= 10))
 		/* snr didn't change enough to bother
 		 * changing the color of the led */
 		return 0;

 	return au8522_led_ctrl(state, led);
 }

 static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
 {
 	struct au8522_state *state = fe->demodulator_priv;
 	int ret = -EINVAL;

 	dprintk("%s()\n", __func__);

 	if (state->current_modulation == QAM_256)
 		ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
 					    ARRAY_SIZE(qam256_mse2snr_tab),
 					    au8522_readreg(state, 0x0522),
 					    snr);
 	else if (state->current_modulation == QAM_64)
 		ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
 					    ARRAY_SIZE(qam64_mse2snr_tab),
 					    au8522_readreg(state, 0x0522),
 					    snr);
 	else /* VSB_8 */
 		ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
 					    ARRAY_SIZE(vsb_mse2snr_tab),
 					    au8522_readreg(state, 0x0311),
 					    snr);

 	if (state->config.led_cfg)
 		au8522_led_status(state, snr);

 	return ret;
 }

 static int au8522_read_signal_strength(struct dvb_frontend *fe,
 				       u16 *signal_strength)
 {
 	/* borrowed from lgdt330x.c
 	 *
 	 * Calculate strength from SNR up to 35dB
 	 * Even though the SNR can go higher than 35dB,
 	 * there is some comfort factor in having a range of
 	 * strong signals that can show at 100%
 	 */
 	u16 snr;
 	u32 tmp;
 	int ret = au8522_read_snr(fe, &snr);

 	*signal_strength = 0;

 	if (0 == ret) {
 		/* The following calculation method was chosen
 		 * purely for the sake of code re-use from the
 		 * other demod drivers that use this method */

 		/* Convert from SNR in dB * 10 to 8.24 fixed-point */
 		tmp = (snr * ((1 << 24) / 10));

 		/* Convert from 8.24 fixed-point to
 		 * scale the range 0 - 35*2^24 into 0 - 65535*/
 		if (tmp >= 8960 * 0x10000)
 			*signal_strength = 0xffff;
 		else
 			*signal_strength = tmp / 8960;
 	}

 	return ret;
 }

 static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 {
 	struct au8522_state *state = fe->demodulator_priv;

 	if (state->current_modulation == VSB_8)
 		*ucblocks = au8522_readreg(state, 0x0087);
 	else
 		*ucblocks = au8522_readreg(state, 0x0543);

 	return 0;
 }

 static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
 {
 	return au8522_read_ucblocks(fe, ber);
 }

 static int au8522_get_frontend(struct dvb_frontend *fe,
 			       struct dtv_frontend_properties *c)
 {
 	struct au8522_state *state = fe->demodulator_priv;

 	c->frequency = state->current_frequency;
 	c->modulation = state->current_modulation;

 	return 0;
 }

 static int au8522_get_tune_settings(struct dvb_frontend *fe,
 				    struct dvb_frontend_tune_settings *tune)
 {
 	tune->min_delay_ms = 1000;
 	return 0;
 }

 static const struct dvb_frontend_ops au8522_ops;


 static void au8522_release(struct dvb_frontend *fe)
 {
 	struct au8522_state *state = fe->demodulator_priv;
 	au8522_release_state(state);
 }

 struct dvb_frontend *au8522_attach(const struct au8522_config *config,
 				   struct i2c_adapter *i2c)
 {
 	struct au8522_state *state = NULL;
 	int instance;

 	/* allocate memory for the internal state */
 	instance = au8522_get_state(&state, i2c, config->demod_address);
 	switch (instance) {
 	case 0:
 		dprintk("%s state allocation failed\n", __func__);
 		break;
 	case 1:
 		/* new demod instance */
 		dprintk("%s using new instance\n", __func__);
 		break;
 	default:
 		/* existing demod instance */
 		dprintk("%s using existing instance\n", __func__);
 		break;
 	}

 	/* setup the state */
 	state->config = *config;
 	state->i2c = i2c;
 	state->operational_mode = AU8522_DIGITAL_MODE;

 	/* create dvb_frontend */
 	memcpy(&state->frontend.ops, &au8522_ops,
 	       sizeof(struct dvb_frontend_ops));
 	state->frontend.demodulator_priv = state;

 	state->frontend.ops.analog_ops.i2c_gate_ctrl = au8522_analog_i2c_gate_ctrl;

 	if (au8522_init(&state->frontend) != 0) {
 		printk(KERN_ERR "%s: Failed to initialize correctly\n",
 			__func__);
 		goto error;
 	}

 	/* Note: Leaving the I2C gate open here. */
 	au8522_i2c_gate_ctrl(&state->frontend, 1);

 	return &state->frontend;

 error:
 	au8522_release_state(state);
 	return NULL;
 }
 EXPORT_SYMBOL(au8522_attach);

 static const struct dvb_frontend_ops au8522_ops = {
 	.delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
 	.info = {
 		.name			= "Auvitek AU8522 QAM/8VSB Frontend",
 		.frequency_min		= 54000000,
 		.frequency_max		= 858000000,
 		.frequency_stepsize	= 62500,
 		.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
 	},

 	.init                 = au8522_init,
 	.sleep                = au8522_sleep,
 	.i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
 	.set_frontend         = au8522_set_frontend,
 	.get_frontend         = au8522_get_frontend,
 	.get_tune_settings    = au8522_get_tune_settings,
 	.read_status          = au8522_read_status,
 	.read_ber             = au8522_read_ber,
 	.read_signal_strength = au8522_read_signal_strength,
 	.read_snr             = au8522_read_snr,
 	.read_ucblocks        = au8522_read_ucblocks,
 	.release              = au8522_release,
 };

 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "Enable verbose debug messages");

 module_param(zv_mode, int, 0644);
 MODULE_PARM_DESC(zv_mode, "Turn on/off ZeeVee modulator compatibility mode (default:on).\n"
 	"\t\ton - modified AU8522 QAM256 initialization.\n"
 	"\t\tProvides faster lock when using ZeeVee modulator based sources");

 MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
 MODULE_AUTHOR("Steven Toth");
 MODULE_LICENSE("GPL");
	/*
	Auvitek AU8522 QAM/8VSB demodulator driver

	Copyright (C) 2008 Steven Toth <stoth@linuxtv.org>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/string.h>
	#include <linux/delay.h>
	#include <media/dvb_frontend.h>
	#include "au8522.h"
	#include "au8522_priv.h"

	static int debug;
	static int zv_mode = 1; /* default to on */

	#define dprintk(arg...)\
	do { if (debug)\
	printk(arg);\
	} while (0)

	struct mse2snr_tab {
	u16 val;
	u16 data;
	};

	/* VSB SNR lookup table */
	static struct mse2snr_tab vsb_mse2snr_tab[] = {
	{ 0, 270 },
	{ 2, 250 },
	{ 3, 240 },
	{ 5, 230 },
	{ 7, 220 },
	{ 9, 210 },
	{ 12, 200 },
	{ 13, 195 },
	{ 15, 190 },
	{ 17, 185 },
	{ 19, 180 },
	{ 21, 175 },
	{ 24, 170 },
	{ 27, 165 },
	{ 31, 160 },
	{ 32, 158 },
	{ 33, 156 },
	{ 36, 152 },
	{ 37, 150 },
	{ 39, 148 },
	{ 40, 146 },
	{ 41, 144 },
	{ 43, 142 },
	{ 44, 140 },
	{ 48, 135 },
	{ 50, 130 },
	{ 43, 142 },
	{ 53, 125 },
	{ 56, 120 },
	{ 256, 115 },
	};

	/* QAM64 SNR lookup table */
	static struct mse2snr_tab qam64_mse2snr_tab[] = {
	{ 15, 0 },
	{ 16, 290 },
	{ 17, 288 },
	{ 18, 286 },
	{ 19, 284 },
	{ 20, 282 },
	{ 21, 281 },
	{ 22, 279 },
	{ 23, 277 },
	{ 24, 275 },
	{ 25, 273 },
	{ 26, 271 },
	{ 27, 269 },
	{ 28, 268 },
	{ 29, 266 },
	{ 30, 264 },
	{ 31, 262 },
	{ 32, 260 },
	{ 33, 259 },
	{ 34, 258 },
	{ 35, 256 },
	{ 36, 255 },
	{ 37, 254 },
	{ 38, 252 },
	{ 39, 251 },
	{ 40, 250 },
	{ 41, 249 },
	{ 42, 248 },
	{ 43, 246 },
	{ 44, 245 },
	{ 45, 244 },
	{ 46, 242 },
	{ 47, 241 },
	{ 48, 240 },
	{ 50, 239 },
	{ 51, 238 },
	{ 53, 237 },
	{ 54, 236 },
	{ 56, 235 },
	{ 57, 234 },
	{ 59, 233 },
	{ 60, 232 },
	{ 62, 231 },
	{ 63, 230 },
	{ 65, 229 },
	{ 67, 228 },
	{ 68, 227 },
	{ 70, 226 },
	{ 71, 225 },
	{ 73, 224 },
	{ 74, 223 },
	{ 76, 222 },
	{ 78, 221 },
	{ 80, 220 },
	{ 82, 219 },
	{ 85, 218 },
	{ 88, 217 },
	{ 90, 216 },
	{ 92, 215 },
	{ 93, 214 },
	{ 94, 212 },
	{ 95, 211 },
	{ 97, 210 },
	{ 99, 209 },
	{ 101, 208 },
	{ 102, 207 },
	{ 104, 206 },
	{ 107, 205 },
	{ 111, 204 },
	{ 114, 203 },
	{ 118, 202 },
	{ 122, 201 },
	{ 125, 200 },
	{ 128, 199 },
	{ 130, 198 },
	{ 132, 197 },
	{ 256, 190 },
	};

	/* QAM256 SNR lookup table */
	static struct mse2snr_tab qam256_mse2snr_tab[] = {
	{ 15, 0 },
	{ 16, 400 },
	{ 17, 398 },
	{ 18, 396 },
	{ 19, 394 },
	{ 20, 392 },
	{ 21, 390 },
	{ 22, 388 },
	{ 23, 386 },
	{ 24, 384 },
	{ 25, 382 },
	{ 26, 380 },
	{ 27, 379 },
	{ 28, 378 },
	{ 29, 377 },
	{ 30, 376 },
	{ 31, 375 },
	{ 32, 374 },
	{ 33, 373 },
	{ 34, 372 },
	{ 35, 371 },
	{ 36, 370 },
	{ 37, 362 },
	{ 38, 354 },
	{ 39, 346 },
	{ 40, 338 },
	{ 41, 330 },
	{ 42, 328 },
	{ 43, 326 },
	{ 44, 324 },
	{ 45, 322 },
	{ 46, 320 },
	{ 47, 319 },
	{ 48, 318 },
	{ 49, 317 },
	{ 50, 316 },
	{ 51, 315 },
	{ 52, 314 },
	{ 53, 313 },
	{ 54, 312 },
	{ 55, 311 },
	{ 56, 310 },
	{ 57, 308 },
	{ 58, 306 },
	{ 59, 304 },
	{ 60, 302 },
	{ 61, 300 },
	{ 62, 298 },
	{ 65, 295 },
	{ 68, 294 },
	{ 70, 293 },
	{ 73, 292 },
	{ 76, 291 },
	{ 78, 290 },
	{ 79, 289 },
	{ 81, 288 },
	{ 82, 287 },
	{ 83, 286 },
	{ 84, 285 },
	{ 85, 284 },
	{ 86, 283 },
	{ 88, 282 },
	{ 89, 281 },
	{ 256, 280 },
	};

	static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
	u16 *snr)
	{
	int i, ret = -EINVAL;
	dprintk("%s()\n", __func__);

	for (i = 0; i < sz; i++) {
	if (mse < tab[i].val) {
	*snr = tab[i].data;
	ret = 0;
	break;
	}
	}
	dprintk("%s() snr=%d\n", __func__, *snr);
	return ret;
	}

	static int au8522_set_if(struct dvb_frontend *fe, enum au8522_if_freq if_freq)
	{
	struct au8522_state *state = fe->demodulator_priv;
	u8 r0b5, r0b6, r0b7;
	char *ifmhz;

	switch (if_freq) {
	case AU8522_IF_3_25MHZ:
	ifmhz = "3.25";
	r0b5 = 0x00;
	r0b6 = 0x3d;
	r0b7 = 0xa0;
	break;
	case AU8522_IF_4MHZ:
	ifmhz = "4.00";
	r0b5 = 0x00;
	r0b6 = 0x4b;
	r0b7 = 0xd9;
	break;
	case AU8522_IF_6MHZ:
	ifmhz = "6.00";
	r0b5 = 0xfb;
	r0b6 = 0x8e;
	r0b7 = 0x39;
	break;
	default:
	dprintk("%s() IF Frequency not supported\n", __func__);
	return -EINVAL;
	}
	dprintk("%s() %s MHz\n", __func__, ifmhz);
	au8522_writereg(state, 0x00b5, r0b5);
	au8522_writereg(state, 0x00b6, r0b6);
	au8522_writereg(state, 0x00b7, r0b7);

	return 0;
	}

	/* VSB Modulation table */
	static struct {
	u16 reg;
	u16 data;
	} VSB_mod_tab[] = {
	{ 0x0090, 0x84 },
	{ 0x2005, 0x00 },
	{ 0x0091, 0x80 },
	{ 0x00a3, 0x0c },
	{ 0x00a4, 0xe8 },
	{ 0x0081, 0xc4 },
	{ 0x00a5, 0x40 },
	{ 0x00a7, 0x40 },
	{ 0x00a6, 0x67 },
	{ 0x0262, 0x20 },
	{ 0x021c, 0x30 },
	{ 0x00d8, 0x1a },
	{ 0x0227, 0xa0 },
	{ 0x0121, 0xff },
	{ 0x00a8, 0xf0 },
	{ 0x00a9, 0x05 },
	{ 0x00aa, 0x77 },
	{ 0x00ab, 0xf0 },
	{ 0x00ac, 0x05 },
	{ 0x00ad, 0x77 },
	{ 0x00ae, 0x41 },
	{ 0x00af, 0x66 },
	{ 0x021b, 0xcc },
	{ 0x021d, 0x80 },
	{ 0x00a4, 0xe8 },
	{ 0x0231, 0x13 },
	};

	/* QAM64 Modulation table */
	static struct {
	u16 reg;
	u16 data;
	} QAM64_mod_tab[] = {
	{ 0x00a3, 0x09 },
	{ 0x00a4, 0x00 },
	{ 0x0081, 0xc4 },
	{ 0x00a5, 0x40 },
	{ 0x00aa, 0x77 },
	{ 0x00ad, 0x77 },
	{ 0x00a6, 0x67 },
	{ 0x0262, 0x20 },
	{ 0x021c, 0x30 },
	{ 0x00b8, 0x3e },
	{ 0x00b9, 0xf0 },
	{ 0x00ba, 0x01 },
	{ 0x00bb, 0x18 },
	{ 0x00bc, 0x50 },
	{ 0x00bd, 0x00 },
	{ 0x00be, 0xea },
	{ 0x00bf, 0xef },
	{ 0x00c0, 0xfc },
	{ 0x00c1, 0xbd },
	{ 0x00c2, 0x1f },
	{ 0x00c3, 0xfc },
	{ 0x00c4, 0xdd },
	{ 0x00c5, 0xaf },
	{ 0x00c6, 0x00 },
	{ 0x00c7, 0x38 },
	{ 0x00c8, 0x30 },
	{ 0x00c9, 0x05 },
	{ 0x00ca, 0x4a },
	{ 0x00cb, 0xd0 },
	{ 0x00cc, 0x01 },
	{ 0x00cd, 0xd9 },
	{ 0x00ce, 0x6f },
	{ 0x00cf, 0xf9 },
	{ 0x00d0, 0x70 },
	{ 0x00d1, 0xdf },
	{ 0x00d2, 0xf7 },
	{ 0x00d3, 0xc2 },
	{ 0x00d4, 0xdf },
	{ 0x00d5, 0x02 },
	{ 0x00d6, 0x9a },
	{ 0x00d7, 0xd0 },
	{ 0x0250, 0x0d },
	{ 0x0251, 0xcd },
	{ 0x0252, 0xe0 },
	{ 0x0253, 0x05 },
	{ 0x0254, 0xa7 },
	{ 0x0255, 0xff },
	{ 0x0256, 0xed },
	{ 0x0257, 0x5b },
	{ 0x0258, 0xae },
	{ 0x0259, 0xe6 },
	{ 0x025a, 0x3d },
	{ 0x025b, 0x0f },
	{ 0x025c, 0x0d },
	{ 0x025d, 0xea },
	{ 0x025e, 0xf2 },
	{ 0x025f, 0x51 },
	{ 0x0260, 0xf5 },
	{ 0x0261, 0x06 },
	{ 0x021a, 0x00 },
	{ 0x0546, 0x40 },
	{ 0x0210, 0xc7 },
	{ 0x0211, 0xaa },
	{ 0x0212, 0xab },
	{ 0x0213, 0x02 },
	{ 0x0502, 0x00 },
	{ 0x0121, 0x04 },
	{ 0x0122, 0x04 },
	{ 0x052e, 0x10 },
	{ 0x00a4, 0xca },
	{ 0x00a7, 0x40 },
	{ 0x0526, 0x01 },
	};

	/* QAM256 Modulation table */
	static struct {
	u16 reg;
	u16 data;
	} QAM256_mod_tab[] = {
	{ 0x00a3, 0x09 },
	{ 0x00a4, 0x00 },
	{ 0x0081, 0xc4 },
	{ 0x00a5, 0x40 },
	{ 0x00aa, 0x77 },
	{ 0x00ad, 0x77 },
	{ 0x00a6, 0x67 },
	{ 0x0262, 0x20 },
	{ 0x021c, 0x30 },
	{ 0x00b8, 0x3e },
	{ 0x00b9, 0xf0 },
	{ 0x00ba, 0x01 },
	{ 0x00bb, 0x18 },
	{ 0x00bc, 0x50 },
	{ 0x00bd, 0x00 },
	{ 0x00be, 0xea },
	{ 0x00bf, 0xef },
	{ 0x00c0, 0xfc },
	{ 0x00c1, 0xbd },
	{ 0x00c2, 0x1f },
	{ 0x00c3, 0xfc },
	{ 0x00c4, 0xdd },
	{ 0x00c5, 0xaf },
	{ 0x00c6, 0x00 },
	{ 0x00c7, 0x38 },
	{ 0x00c8, 0x30 },
	{ 0x00c9, 0x05 },
	{ 0x00ca, 0x4a },
	{ 0x00cb, 0xd0 },
	{ 0x00cc, 0x01 },
	{ 0x00cd, 0xd9 },
	{ 0x00ce, 0x6f },
	{ 0x00cf, 0xf9 },
	{ 0x00d0, 0x70 },
	{ 0x00d1, 0xdf },
	{ 0x00d2, 0xf7 },
	{ 0x00d3, 0xc2 },
	{ 0x00d4, 0xdf },
	{ 0x00d5, 0x02 },
	{ 0x00d6, 0x9a },
	{ 0x00d7, 0xd0 },
	{ 0x0250, 0x0d },
	{ 0x0251, 0xcd },
	{ 0x0252, 0xe0 },
	{ 0x0253, 0x05 },
	{ 0x0254, 0xa7 },
	{ 0x0255, 0xff },
	{ 0x0256, 0xed },
	{ 0x0257, 0x5b },
	{ 0x0258, 0xae },
	{ 0x0259, 0xe6 },
	{ 0x025a, 0x3d },
	{ 0x025b, 0x0f },
	{ 0x025c, 0x0d },
	{ 0x025d, 0xea },
	{ 0x025e, 0xf2 },
	{ 0x025f, 0x51 },
	{ 0x0260, 0xf5 },
	{ 0x0261, 0x06 },
	{ 0x021a, 0x00 },
	{ 0x0546, 0x40 },
	{ 0x0210, 0x26 },
	{ 0x0211, 0xf6 },
	{ 0x0212, 0x84 },
	{ 0x0213, 0x02 },
	{ 0x0502, 0x01 },
	{ 0x0121, 0x04 },
	{ 0x0122, 0x04 },
	{ 0x052e, 0x10 },
	{ 0x00a4, 0xca },
	{ 0x00a7, 0x40 },
	{ 0x0526, 0x01 },
	};

	static struct {
	u16 reg;
	u16 data;
	} QAM256_mod_tab_zv_mode[] = {
	{ 0x80a3, 0x09 },
	{ 0x80a4, 0x00 },
	{ 0x8081, 0xc4 },
	{ 0x80a5, 0x40 },
	{ 0x80b5, 0xfb },
	{ 0x80b6, 0x8e },
	{ 0x80b7, 0x39 },
	{ 0x80aa, 0x77 },
	{ 0x80ad, 0x77 },
	{ 0x80a6, 0x67 },
	{ 0x8262, 0x20 },
	{ 0x821c, 0x30 },
	{ 0x80b8, 0x3e },
	{ 0x80b9, 0xf0 },
	{ 0x80ba, 0x01 },
	{ 0x80bb, 0x18 },
	{ 0x80bc, 0x50 },
	{ 0x80bd, 0x00 },
	{ 0x80be, 0xea },
	{ 0x80bf, 0xef },
	{ 0x80c0, 0xfc },
	{ 0x80c1, 0xbd },
	{ 0x80c2, 0x1f },
	{ 0x80c3, 0xfc },
	{ 0x80c4, 0xdd },
	{ 0x80c5, 0xaf },
	{ 0x80c6, 0x00 },
	{ 0x80c7, 0x38 },
	{ 0x80c8, 0x30 },
	{ 0x80c9, 0x05 },
	{ 0x80ca, 0x4a },
	{ 0x80cb, 0xd0 },
	{ 0x80cc, 0x01 },
	{ 0x80cd, 0xd9 },
	{ 0x80ce, 0x6f },
	{ 0x80cf, 0xf9 },
	{ 0x80d0, 0x70 },
	{ 0x80d1, 0xdf },
	{ 0x80d2, 0xf7 },
	{ 0x80d3, 0xc2 },
	{ 0x80d4, 0xdf },
	{ 0x80d5, 0x02 },
	{ 0x80d6, 0x9a },
	{ 0x80d7, 0xd0 },
	{ 0x8250, 0x0d },
	{ 0x8251, 0xcd },
	{ 0x8252, 0xe0 },
	{ 0x8253, 0x05 },
	{ 0x8254, 0xa7 },
	{ 0x8255, 0xff },
	{ 0x8256, 0xed },
	{ 0x8257, 0x5b },
	{ 0x8258, 0xae },
	{ 0x8259, 0xe6 },
	{ 0x825a, 0x3d },
	{ 0x825b, 0x0f },
	{ 0x825c, 0x0d },
	{ 0x825d, 0xea },
	{ 0x825e, 0xf2 },
	{ 0x825f, 0x51 },
	{ 0x8260, 0xf5 },
	{ 0x8261, 0x06 },
	{ 0x821a, 0x01 },
	{ 0x8546, 0x40 },
	{ 0x8210, 0x26 },
	{ 0x8211, 0xf6 },
	{ 0x8212, 0x84 },
	{ 0x8213, 0x02 },
	{ 0x8502, 0x01 },
	{ 0x8121, 0x04 },
	{ 0x8122, 0x04 },
	{ 0x852e, 0x10 },
	{ 0x80a4, 0xca },
	{ 0x80a7, 0x40 },
	{ 0x8526, 0x01 },
	};

	static int au8522_enable_modulation(struct dvb_frontend *fe,
	enum fe_modulation m)
	{
	struct au8522_state *state = fe->demodulator_priv;
	int i;

	dprintk("%s(0x%08x)\n", __func__, m);

	switch (m) {
	case VSB_8:
	dprintk("%s() VSB_8\n", __func__);
	for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
	au8522_writereg(state,
	VSB_mod_tab[i].reg,
	VSB_mod_tab[i].data);
	au8522_set_if(fe, state->config.vsb_if);
	break;
	case QAM_64:
	dprintk("%s() QAM 64\n", __func__);
	for (i = 0; i < ARRAY_SIZE(QAM64_mod_tab); i++)
	au8522_writereg(state,
	QAM64_mod_tab[i].reg,
	QAM64_mod_tab[i].data);
	au8522_set_if(fe, state->config.qam_if);
	break;
	case QAM_256:
	if (zv_mode) {
	dprintk("%s() QAM 256 (zv_mode)\n", __func__);
	for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab_zv_mode); i++)
	au8522_writereg(state,
	QAM256_mod_tab_zv_mode[i].reg,
	QAM256_mod_tab_zv_mode[i].data);
	au8522_set_if(fe, state->config.qam_if);
	msleep(100);
	au8522_writereg(state, 0x821a, 0x00);
	} else {
	dprintk("%s() QAM 256\n", __func__);
	for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab); i++)
	au8522_writereg(state,
	QAM256_mod_tab[i].reg,
	QAM256_mod_tab[i].data);
	au8522_set_if(fe, state->config.qam_if);
	}
	break;
	default:
	dprintk("%s() Invalid modulation\n", __func__);
	return -EINVAL;
	}

	state->current_modulation = m;

	return 0;
	}

	/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
	static int au8522_set_frontend(struct dvb_frontend *fe)
	{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct au8522_state *state = fe->demodulator_priv;
	int ret = -EINVAL;

	dprintk("%s(frequency=%d)\n", __func__, c->frequency);

	if ((state->current_frequency == c->frequency) &&
	(state->current_modulation == c->modulation))
	return 0;

	if (fe->ops.tuner_ops.set_params) {
	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 1);
	ret = fe->ops.tuner_ops.set_params(fe);
	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 0);
	}

	if (ret < 0)
	return ret;

	/* Allow the tuner to settle */
	if (zv_mode) {
	dprintk("%s() increase tuner settling time for zv_mode\n",
	__func__);
	msleep(250);
	} else
	msleep(100);

	au8522_enable_modulation(fe, c->modulation);

	state->current_frequency = c->frequency;

	return 0;
	}

	static int au8522_read_status(struct dvb_frontend fe, enum fe_status status)
	{
	struct au8522_state *state = fe->demodulator_priv;
	u8 reg;
	u32 tuner_status = 0;

	*status = 0;

	if (state->current_modulation == VSB_8) {
	dprintk("%s() Checking VSB_8\n", __func__);
	reg = au8522_readreg(state, 0x0088);
	if ((reg & 0x03) == 0x03)
	*status \|= FE_HAS_LOCK \| FE_HAS_SYNC \| FE_HAS_VITERBI;
	} else {
	dprintk("%s() Checking QAM\n", __func__);
	reg = au8522_readreg(state, 0x0541);
	if (reg & 0x80)
	*status \|= FE_HAS_VITERBI;
	if (reg & 0x20)
	*status \|= FE_HAS_LOCK \| FE_HAS_SYNC;
	}

	switch (state->config.status_mode) {
	case AU8522_DEMODLOCKING:
	dprintk("%s() DEMODLOCKING\n", __func__);
	if (*status & FE_HAS_VITERBI)
	*status \|= FE_HAS_CARRIER \| FE_HAS_SIGNAL;
	break;
	case AU8522_TUNERLOCKING:
	/* Get the tuner status */
	dprintk("%s() TUNERLOCKING\n", __func__);
	if (fe->ops.tuner_ops.get_status) {
	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 1);

	fe->ops.tuner_ops.get_status(fe, &tuner_status);

	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 0);
	}
	if (tuner_status)
	*status \|= FE_HAS_CARRIER \| FE_HAS_SIGNAL;
	break;
	}
	state->fe_status = *status;

	if (*status & FE_HAS_LOCK)
	/* turn on LED, if it isn't on already */
	au8522_led_ctrl(state, -1);
	else
	/* turn off LED */
	au8522_led_ctrl(state, 0);

	dprintk("%s() status 0x%08x\n", __func__, *status);

	return 0;
	}

	static int au8522_led_status(struct au8522_state state, const u16 snr)
	{
	struct au8522_led_config *led_config = state->config.led_cfg;
	int led;
	u16 strong;

	/* bail out if we can't control an LED */
	if (!led_config)
	return 0;

	if (0 == (state->fe_status & FE_HAS_LOCK))
	return au8522_led_ctrl(state, 0);
	else if (state->current_modulation == QAM_256)
	strong = led_config->qam256_strong;
	else if (state->current_modulation == QAM_64)
	strong = led_config->qam64_strong;
	else /* (state->current_modulation == VSB_8) */
	strong = led_config->vsb8_strong;

	if (*snr >= strong)
	led = 2;
	else
	led = 1;

	if ((state->led_state) &&
	(((strong < snr) ? (snr - strong) : (strong - *snr)) <= 10))
	/* snr didn't change enough to bother
	* changing the color of the led */
	return 0;

	return au8522_led_ctrl(state, led);
	}

	static int au8522_read_snr(struct dvb_frontend fe, u16 snr)
	{
	struct au8522_state *state = fe->demodulator_priv;
	int ret = -EINVAL;

	dprintk("%s()\n", __func__);

	if (state->current_modulation == QAM_256)
	ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
	ARRAY_SIZE(qam256_mse2snr_tab),
	au8522_readreg(state, 0x0522),
	snr);
	else if (state->current_modulation == QAM_64)
	ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
	ARRAY_SIZE(qam64_mse2snr_tab),
	au8522_readreg(state, 0x0522),
	snr);
	else /* VSB_8 */
	ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
	ARRAY_SIZE(vsb_mse2snr_tab),
	au8522_readreg(state, 0x0311),
	snr);

	if (state->config.led_cfg)
	au8522_led_status(state, snr);

	return ret;
	}

	static int au8522_read_signal_strength(struct dvb_frontend *fe,
	u16 *signal_strength)
	{
	/* borrowed from lgdt330x.c
	*
	* Calculate strength from SNR up to 35dB
	* Even though the SNR can go higher than 35dB,
	* there is some comfort factor in having a range of
	* strong signals that can show at 100%
	*/
	u16 snr;
	u32 tmp;
	int ret = au8522_read_snr(fe, &snr);

	*signal_strength = 0;

	if (0 == ret) {
	/* The following calculation method was chosen
	* purely for the sake of code re-use from the
	* other demod drivers that use this method */

	/* Convert from SNR in dB * 10 to 8.24 fixed-point */
	tmp = (snr * ((1 << 24) / 10));

	/* Convert from 8.24 fixed-point to
	* scale the range 0 - 352^24 into 0 - 65535/
	if (tmp >= 8960 * 0x10000)
	*signal_strength = 0xffff;
	else
	*signal_strength = tmp / 8960;
	}

	return ret;
	}

	static int au8522_read_ucblocks(struct dvb_frontend fe, u32 ucblocks)
	{
	struct au8522_state *state = fe->demodulator_priv;

	if (state->current_modulation == VSB_8)
	*ucblocks = au8522_readreg(state, 0x0087);
	else
	*ucblocks = au8522_readreg(state, 0x0543);

	return 0;
	}

	static int au8522_read_ber(struct dvb_frontend fe, u32 ber)
	{
	return au8522_read_ucblocks(fe, ber);
	}

	static int au8522_get_frontend(struct dvb_frontend *fe,
	struct dtv_frontend_properties *c)
	{
	struct au8522_state *state = fe->demodulator_priv;

	c->frequency = state->current_frequency;
	c->modulation = state->current_modulation;

	return 0;
	}

	static int au8522_get_tune_settings(struct dvb_frontend *fe,
	struct dvb_frontend_tune_settings *tune)
	{
	tune->min_delay_ms = 1000;
	return 0;
	}

	static const struct dvb_frontend_ops au8522_ops;


	static void au8522_release(struct dvb_frontend *fe)
	{
	struct au8522_state *state = fe->demodulator_priv;
	au8522_release_state(state);
	}

	struct dvb_frontend au8522_attach(const struct au8522_config config,
	struct i2c_adapter *i2c)
	{
	struct au8522_state *state = NULL;
	int instance;

	/* allocate memory for the internal state */
	instance = au8522_get_state(&state, i2c, config->demod_address);
	switch (instance) {
	case 0:
	dprintk("%s state allocation failed\n", __func__);
	break;
	case 1:
	/* new demod instance */
	dprintk("%s using new instance\n", __func__);
	break;
	default:
	/* existing demod instance */
	dprintk("%s using existing instance\n", __func__);
	break;
	}

	/* setup the state */
	state->config = *config;
	state->i2c = i2c;
	state->operational_mode = AU8522_DIGITAL_MODE;

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &au8522_ops,
	sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;

	state->frontend.ops.analog_ops.i2c_gate_ctrl = au8522_analog_i2c_gate_ctrl;

	if (au8522_init(&state->frontend) != 0) {
	printk(KERN_ERR "%s: Failed to initialize correctly\n",
	__func__);
	goto error;
	}

	/* Note: Leaving the I2C gate open here. */
	au8522_i2c_gate_ctrl(&state->frontend, 1);

	return &state->frontend;

	error:
	au8522_release_state(state);
	return NULL;
	}
	EXPORT_SYMBOL(au8522_attach);

	static const struct dvb_frontend_ops au8522_ops = {
	.delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
	.info = {
	.name = "Auvitek AU8522 QAM/8VSB Frontend",
	.frequency_min = 54000000,
	.frequency_max = 858000000,
	.frequency_stepsize = 62500,
	.caps = FE_CAN_QAM_64 \| FE_CAN_QAM_256 \| FE_CAN_8VSB
	},

	.init = au8522_init,
	.sleep = au8522_sleep,
	.i2c_gate_ctrl = au8522_i2c_gate_ctrl,
	.set_frontend = au8522_set_frontend,
	.get_frontend = au8522_get_frontend,
	.get_tune_settings = au8522_get_tune_settings,
	.read_status = au8522_read_status,
	.read_ber = au8522_read_ber,
	.read_signal_strength = au8522_read_signal_strength,
	.read_snr = au8522_read_snr,
	.read_ucblocks = au8522_read_ucblocks,
	.release = au8522_release,
	};

	module_param(debug, int, 0644);
	MODULE_PARM_DESC(debug, "Enable verbose debug messages");

	module_param(zv_mode, int, 0644);
	MODULE_PARM_DESC(zv_mode, "Turn on/off ZeeVee modulator compatibility mode (default:on).\n"
	"\t\ton - modified AU8522 QAM256 initialization.\n"
	"\t\tProvides faster lock when using ZeeVee modulator based sources");

	MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
	MODULE_AUTHOR("Steven Toth");
	MODULE_LICENSE("GPL");