au8522.c

trident tm5600的linux驱动

/*
    Auvitek AU8522 QAM/8VSB demodulator driver

    Copyright (C) 2008 Steven Toth <[e-mail]>

    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/slab.h>
#include <linux/delay.h>
#include "dvb_frontend.h"
#include "au8522.h"

struct au8522_state {

	struct i2c_adapter *i2c;

	/* configuration settings */
	const struct au8522_config *config;

	struct dvb_frontend frontend;

	u32 current_frequency;
	fe_modulation_t current_modulation;

	u32 fe_status;
	unsigned int led_state;
};

static int debug;

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

/* 16 bit registers, 8 bit values */
static int au8522_writereg(struct au8522_state *state, u16 reg, u8 data)
{
	int ret;
	u8 buf [] = { reg >> 8, reg & 0xff, data };

	struct i2c_msg msg = { .addr = state->config->demod_address,
			       .flags = 0, .buf = buf, .len = 3 };

	ret = i2c_transfer(state->i2c, &msg, 1);

	if (ret != 1)
		printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, "
		       "ret == %i)\n", __func__, reg, data, ret);

	return (ret != 1) ? -1 : 0;
}

static u8 au8522_readreg(struct au8522_state *state, u16 reg)
{
	int ret;
	u8 b0 [] = { reg >> 8, reg & 0xff };
	u8 b1 [] = { 0 };

	struct i2c_msg msg [] = {
		{ .addr = state->config->demod_address, .flags = 0,
		  .buf = b0, .len = 2 },
		{ .addr = state->config->demod_address, .flags = I2C_M_RD,
		  .buf = b1, .len = 1 } };

	ret = i2c_transfer(state->i2c, msg, 2);

	if (ret != 2)
		printk(KERN_ERR "%s: readreg error (ret == %i)\n",
		       __func__, ret);
	return b1[0];
}

static int au8522_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
{
	struct au8522_state *state = fe->demodulator_priv;

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

	if (enable)
		return au8522_writereg(state, 0x106, 1);
	else
		return au8522_writereg(state, 0x106, 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[] = {
	{  16,   0 },
	{  17, 400 },
	{  18, 398 },
	{  19, 396 },
	{  20, 394 },
	{  21, 392 },
	{  22, 390 },
	{  23, 388 },
	{  24, 386 },
	{  25, 384 },
	{  26, 382 },
	{  27, 380 },
	{  28, 379 },
	{  29, 378 },
	{  30, 377 },
	{  31, 376 },
	{  32, 375 },
	{  33, 374 },
	{  34, 373 },
	{  35, 372 },
	{  36, 371 },
	{  37, 370 },
	{  38, 362 },
	{  39, 354 },
	{  40, 346 },
	{  41, 338 },
	{  42, 330 },
	{  43, 328 },
	{  44, 326 },
	{  45, 324 },
	{  46, 322 },
	{  47, 320 },
	{  48, 319 },
	{  49, 318 },
	{  50, 317 },
	{  51, 316 },
	{  52, 315 },
	{  53, 314 },
	{  54, 313 },
	{  55, 312 },
	{  56, 311 },
	{  57, 310 },
	{  58, 308 },
	{  59, 306 },
	{  60, 304 },
	{  61, 302 },
	{  62, 300 },
	{  63, 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, 0x80b5, r0b5);
	au8522_writereg(state, 0x80b6, r0b6);
	au8522_writereg(state, 0x80b7, r0b7);

	return 0;
}

/* VSB Modulation table */
static struct {
	u16 reg;
	u16 data;
} VSB_mod_tab[] = {
	{ 0x8090, 0x84 },
	{ 0x4092, 0x11 },
	{ 0x2005, 0x00 },
	{ 0x8091, 0x80 },
	{ 0x80a3, 0x0c },
	{ 0x80a4, 0xe8 },
	{ 0x8081, 0xc4 },
	{ 0x80a5, 0x40 },
	{ 0x80a7, 0x40 },
	{ 0x80a6, 0x67 },
	{ 0x8262, 0x20 },
	{ 0x821c, 0x30 },
	{ 0x80d8, 0x1a },
	{ 0x8227, 0xa0 },
	{ 0x8121, 0xff },
	{ 0x80a8, 0xf0 },
	{ 0x80a9, 0x05 },
	{ 0x80aa, 0x77 },
	{ 0x80ab, 0xf0 },
	{ 0x80ac, 0x05 },
	{ 0x80ad, 0x77 },
	{ 0x80ae, 0x41 },
	{ 0x80af, 0x66 },
	{ 0x821b, 0xcc },
	{ 0x821d, 0x80 },
	{ 0x80a4, 0xe8 },
	{ 0x8231, 0x13 },
};

/* QAM Modulation table */
static struct {
	u16 reg;
	u16 data;
} QAM_mod_tab[] = {
	{ 0x80a3, 0x09 },
	{ 0x80a4, 0x00 },
	{ 0x8081, 0xc4 },
	{ 0x80a5, 0x40 },
	{ 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 },