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NetBSD/sys/dev/i2c/lg3303.c

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/* $NetBSD: lg3303.c,v 1.8 2011/10/02 19:03:56 jmcneill Exp $ */
/*-
* Copyright 2007 Jason Harmening
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/param.h>
__KERNEL_RCSID(0, "$NetBSD: lg3303.c,v 1.8 2011/10/02 19:03:56 jmcneill Exp $");
#include <sys/types.h>
#include <sys/kmem.h>
#include <sys/module.h>
#include <sys/bitops.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/lg3303var.h>
#include <dev/dtv/dtvif.h>
#include <dev/dtv/dtv_math.h>
#define REG_TOP_CONTROL 0x00
#define REG_IRQ_MASK 0x01
#define REG_IRQ_STATUS 0x02
#define REG_VSB_CARRIER_FREQ0 0x16
#define REG_VSB_CARRIER_FREQ1 0x17
#define REG_VSB_CARRIER_FREQ2 0x18
#define REG_VSB_CARRIER_FREQ3 0x19
#define REG_CARRIER_MSEQAM1 0x1a
#define REG_CARRIER_MSEQAM2 0x1b
#define REG_CARRIER_LOCK 0x1c
#define REG_TIMING_RECOVERY 0x1d
#define REG_AGC_DELAY0 0x2a
#define REG_AGC_DELAY1 0x2b
#define REG_AGC_DELAY2 0x2c
#define REG_AGC_RF_BANDWIDTH0 0x2d
#define REG_AGC_RF_BANDWIDTH1 0x2e
#define REG_AGC_RF_BANDWIDTH2 0x2f
#define REG_AGC_LOOP_BANDWIDTH0 0x30
#define REG_AGC_LOOP_BANDWIDTH1 0x31
#define REG_AGC_FUNC_CTRL1 0x32
#define REG_AGC_FUNC_CTRL2 0x33
#define REG_AGC_FUNC_CTRL3 0x34
#define REG_AGC_RFIF_ACC0 0x39
#define REG_AGC_RFIF_ACC1 0x3a
#define REG_AGC_RFIF_ACC2 0x3b
#define REG_AGC_STATUS 0x3f
#define REG_SYNC_STATUS_VSB 0x43
#define REG_DEMUX_CONTROL 0x66
#define REG_EQPH_ERR0 0x6e
#define REG_EQ_ERR1 0x6f
#define REG_EQ_ERR2 0x70
#define REG_PH_ERR1 0x71
#define REG_PH_ERR2 0x72
#define REG_PACKET_ERR_COUNTER1 0x8b
#define REG_PACKET_ERR_COUNTER2 0x8c
#define LG3303_DEFAULT_DELAY 250000
static int lg3303_reset(struct lg3303 *);
static int lg3303_init(struct lg3303 *);
struct lg3303 *
lg3303_open(device_t parent, i2c_tag_t i2c, i2c_addr_t addr, int flags)
{
struct lg3303 *lg;
lg = kmem_alloc(sizeof(*lg), KM_SLEEP);
if (lg == NULL)
return NULL;
lg->parent = parent;
lg->i2c = i2c;
lg->i2c_addr = addr;
lg->current_modulation = -1;
lg->flags = flags;
if (lg3303_init(lg) != 0) {
kmem_free(lg, sizeof(*lg));
return NULL;
}
device_printf(lg->parent, "lg3303: found @ 0x%02x\n", addr);
return lg;
}
void
lg3303_close(struct lg3303 *lg)
{
kmem_free(lg, sizeof(*lg));
}
static int
lg3303_write(struct lg3303 *lg, uint8_t *buf, size_t len)
{
unsigned int i;
uint8_t *p = buf;
int error;
for (i = 0; i < len - 1; i += 2) {
error = iic_exec(lg->i2c, I2C_OP_WRITE_WITH_STOP, lg->i2c_addr,
p, 2, NULL, 0, 0);
if (error)
return error;
p += 2;
}
return 0;
}
static int
lg3303_read(struct lg3303 *lg, uint8_t reg, uint8_t *buf, size_t len)
{
int error;
error = iic_exec(lg->i2c, I2C_OP_WRITE, lg->i2c_addr,
&reg, sizeof(reg), NULL, 0, 0);
if (error)
return error;
return iic_exec(lg->i2c, I2C_OP_READ, lg->i2c_addr,
NULL, 0, buf, len, 0);
}
static int
lg3303_reset(struct lg3303 *lg)
{
uint8_t buffer[] = {REG_IRQ_STATUS, 0x00};
int error = lg3303_write(lg, buffer, 2);
if (error == 0) {
buffer[1] = 0x01;
error = lg3303_write(lg, buffer, 2);
}
return error;
}
static int
lg3303_init(struct lg3303 *lg)
{
//static uint8_t init_data[] = {0x4c, 0x14, 0x87, 0xf3};
static uint8_t init_data[] = {0x4c, 0x14};
size_t len;
int error;
#if notyet
if (clock_polarity == DVB_IFC_POS_POL)
len = 4;
else
#endif
len = 2;
error = lg3303_write(lg, init_data, len);
if (error == 0)
lg3303_reset(lg);
return error;
}
int
lg3303_set_modulation(struct lg3303 *lg, fe_modulation_t modulation)
{
int error;
static uint8_t vsb_data[] = {
0x04, 0x00,
0x0d, 0x40,
0x0e, 0x87,
0x0f, 0x8e,
0x10, 0x01,
0x47, 0x8b
};
static uint8_t qam_data[] = {
0x04, 0x00,
0x0d, 0x00,
0x0e, 0x00,
0x0f, 0x00,
0x10, 0x00,
0x51, 0x63,
0x47, 0x66,
0x48, 0x66,
0x4d, 0x1a,
0x49, 0x08,
0x4a, 0x9b
};
uint8_t top_ctrl[] = {REG_TOP_CONTROL, 0x00};
error = lg3303_reset(lg);
if (error)
return error;
if (lg->flags & LG3303_CFG_SERIAL_INPUT)
top_ctrl[1] = 0x40;
switch (modulation) {
case VSB_8:
top_ctrl[1] |= 0x03;
error = lg3303_write(lg, vsb_data, sizeof(vsb_data));
if (error)
return error;
break;
case QAM_256:
top_ctrl[1] |= 0x01;
/* FALLTHROUGH */
case QAM_64:
error = lg3303_write(lg, qam_data, sizeof(qam_data));
if (error)
return error;
break;
default:
device_printf(lg->parent,
"lg3303: unsupported modulation type (%d)\n",
modulation);
return EINVAL;
}
error = lg3303_write(lg, top_ctrl, sizeof(top_ctrl));
if (error)
return error;
lg->current_modulation = modulation;
lg3303_reset(lg);
return error;
}
fe_status_t
lg3303_get_dtv_status(struct lg3303 *lg)
{
uint8_t reg = 0, value = 0x00;
fe_status_t festatus = 0;
int error = 0;
error = lg3303_read(lg, 0x58, &value, sizeof(value));
if (error)
return 0;
if (value & 0x01)
festatus |= FE_HAS_SIGNAL;
error = lg3303_read(lg, REG_CARRIER_LOCK, &value, sizeof(value));
if (error)
return 0;
switch (lg->current_modulation) {
case VSB_8:
if (value & 0x80)
festatus |= FE_HAS_CARRIER;
reg = 0x38;
break;
case QAM_64:
case QAM_256:
if ((value & 0x07) == 0x07)
festatus |= FE_HAS_CARRIER;
reg = 0x8a;
break;
default:
device_printf(lg->parent,
"lg3303: unsupported modulation type (%d)\n",
lg->current_modulation);
return 0;
}
if ((festatus & FE_HAS_CARRIER) == 0)
return festatus;
error = lg3303_read(lg, reg, &value, sizeof(value));
if (!error && (value & 0x01))
festatus |= FE_HAS_LOCK;
if (festatus & FE_HAS_LOCK)
festatus |= (FE_HAS_SYNC | FE_HAS_VITERBI);
return festatus;
}
uint16_t
lg3303_get_snr(struct lg3303 *lg)
{
int64_t noise, snr_const;
uint8_t buffer[5];
int64_t snr;
int error;
switch (lg->current_modulation) {
case VSB_8:
error = lg3303_read(lg, REG_EQPH_ERR0, buffer, sizeof(buffer));
if (error)
return 0;
noise = ((buffer[0] & 7) << 16) | (buffer[3] << 8) | buffer[4];
snr_const = 73957994; /* log10(2560) * pow(2,24) */
break;
case QAM_64:
case QAM_256:
error = lg3303_read(lg, REG_CARRIER_MSEQAM1, buffer, 2);
if (error)
return 0;
noise = (buffer[0] << 8) | buffer[1];
if (lg->current_modulation == QAM_64)
snr_const = 97939837; /* log10(688128) * pow(2,24) */
else
snr_const = 98026066; /* log10(696320) * pow(2,24) */
break;
default:
device_printf(lg->parent,
"lg3303: unsupported modulation type (%d)\n",
lg->current_modulation);
return 0;
}
if (noise == 0)
return 0;
snr = dtv_intlog10(noise);
if (snr > snr_const)
return 0;
return (10 * (snr_const - snr)) >> 16;
}
uint16_t
lg3303_get_signal_strength(struct lg3303 *lg)
{
return ((uint32_t)lg3303_get_snr(lg) << 16) / 8960;
}
uint32_t
lg3303_get_ucblocks(struct lg3303 *lg)
{
uint8_t buffer[2];
int error;
error = lg3303_read(lg, REG_PACKET_ERR_COUNTER1, buffer, sizeof(buffer));
if (error)
return 0;
return (buffer[0] << 8) | buffer[1];
}
MODULE(MODULE_CLASS_DRIVER, lg3303, "iic,dtv_math");
static int
lg3303_modcmd(modcmd_t cmd, void *opaque)
{
if (cmd == MODULE_CMD_INIT || cmd == MODULE_CMD_FINI)
return 0;
return ENOTTY;
}
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