// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for Conexant CX24113/CX24128 Tuner (Satellite)
*
* Copyright (C) 2007-8 Patrick Boettcher <[email protected]>
*
* Developed for BBTI / Technisat
*/
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <media/dvb_frontend.h>
#include "cx24113.h"
static int debug;
#define cx_info(args...) do { printk(KERN_INFO "CX24113: " args); } while (0)
#define cx_err(args...) do { printk(KERN_ERR "CX24113: " args); } while (0)
#define dprintk(args...) \
do { \
if (debug) { \
printk(KERN_DEBUG "CX24113: %s: ", __func__); \
printk(args); \
} \
} while (0)
struct cx24113_state {
struct i2c_adapter *i2c;
const struct cx24113_config *config;
#define REV_CX24113 0x23
u8 rev;
u8 ver;
u8 icp_mode:1;
#define ICP_LEVEL1 0
#define ICP_LEVEL2 1
#define ICP_LEVEL3 2
#define ICP_LEVEL4 3
u8 icp_man:2;
u8 icp_auto_low:2;
u8 icp_auto_mlow:2;
u8 icp_auto_mhi:2;
u8 icp_auto_hi:2;
u8 icp_dig;
#define LNA_MIN_GAIN 0
#define LNA_MID_GAIN 1
#define LNA_MAX_GAIN 2
u8 lna_gain:2;
u8 acp_on:1;
u8 vco_mode:2;
u8 vco_shift:1;
#define VCOBANDSEL_6 0x80
#define VCOBANDSEL_5 0x01
#define VCOBANDSEL_4 0x02
#define VCOBANDSEL_3 0x04
#define VCOBANDSEL_2 0x08
#define VCOBANDSEL_1 0x10
u8 vco_band;
#define VCODIV4 4
#define VCODIV2 2
u8 vcodiv;
u8 bs_delay:4;
u16 bs_freqcnt:13;
u16 bs_rdiv;
u8 prescaler_mode:1;
u8 rfvga_bias_ctrl;
s16 tuner_gain_thres;
u8 gain_level;
u32 frequency;
u8 refdiv;
u8 Fwindow_enabled;
};
static int cx24113_writereg(struct cx24113_state *state, int reg, int data)
{
u8 buf[] = { reg, data };
struct i2c_msg msg = { .addr = state->config->i2c_addr,
.flags = 0, .buf = buf, .len = 2 };
int err = i2c_transfer(state->i2c, &msg, 1);
if (err != 1) {
printk(KERN_DEBUG "%s: writereg error(err == %i, reg == 0x%02x, data == 0x%02x)\n",
__func__, err, reg, data);
return err;
}
return 0;
}
static int cx24113_readreg(struct cx24113_state *state, u8 reg)
{
int ret;
u8 b;
struct i2c_msg msg[] = {
{ .addr = state->config->i2c_addr,
.flags = 0, .buf = ®, .len = 1 },
{ .addr = state->config->i2c_addr,
.flags = I2C_M_RD, .buf = &b, .len = 1 }
};
ret = i2c_transfer(state->i2c, msg, 2);
if (ret != 2) {
printk(KERN_DEBUG "%s: reg=0x%x (error=%d)\n",
__func__, reg, ret);
return ret;
}
return b;
}
static void cx24113_set_parameters(struct cx24113_state *state)
{
u8 r;
r = cx24113_readreg(state, 0x10) & 0x82;
r |= state->icp_mode;
r |= state->icp_man << 4;
r |= state->icp_dig << 2;
r |= state->prescaler_mode << 5;
cx24113_writereg(state, 0x10, r);
r = (state->icp_auto_low << 0) | (state->icp_auto_mlow << 2)
| (state->icp_auto_mhi << 4) | (state->icp_auto_hi << 6);
cx24113_writereg(state, 0x11, r);
if (state->rev == REV_CX24113) {
r = cx24113_readreg(state, 0x20) & 0xec;
r |= state->lna_gain;
r |= state->rfvga_bias_ctrl << 4;
cx24113_writereg(state, 0x20, r);
}
r = cx24113_readreg(state, 0x12) & 0x03;
r |= state->acp_on << 2;
r |= state->bs_delay << 4;
cx24113_writereg(state, 0x12, r);
r = cx24113_readreg(state, 0x18) & 0x40;
r |= state->vco_shift;
if (state->vco_band == VCOBANDSEL_6)
r |= (1 << 7);
else
r |= (state->vco_band << 1);
cx24113_writereg(state, 0x18, r);
r = cx24113_readreg(state, 0x14) & 0x20;
r |= (state->vco_mode << 6) | ((state->bs_freqcnt >> 8) & 0x1f);
cx24113_writereg(state, 0x14, r);
cx24113_writereg(state, 0x15, (state->bs_freqcnt & 0xff));
cx24113_writereg(state, 0x16, (state->bs_rdiv >> 4) & 0xff);
r = (cx24113_readreg(state, 0x17) & 0x0f) |
((state->bs_rdiv & 0x0f) << 4);
cx24113_writereg(state, 0x17, r);
}
#define VGA_0 0x00
#define VGA_1 0x04
#define VGA_2 0x02
#define VGA_3 0x06
#define VGA_4 0x01
#define VGA_5 0x05
#define VGA_6 0x03
#define VGA_7 0x07
#define RFVGA_0 0x00
#define RFVGA_1 0x01
#define RFVGA_2 0x02
#define RFVGA_3 0x03
static int cx24113_set_gain_settings(struct cx24113_state *state,
s16 power_estimation)
{
u8 ampout = cx24113_readreg(state, 0x1d) & 0xf0,
vga = cx24113_readreg(state, 0x1f) & 0x3f,
rfvga = cx24113_readreg(state, 0x20) & 0xf3;
u8 gain_level = power_estimation >= state->tuner_gain_thres;
dprintk("power estimation: %d, thres: %d, gain_level: %d/%d\n",
power_estimation, state->tuner_gain_thres,
state->gain_level, gain_level);
if (gain_level == state->gain_level)
return 0; /* nothing to be done */
ampout |= 0xf;
if (gain_level) {
rfvga |= RFVGA_0 << 2;
vga |= (VGA_7 << 3) | VGA_7;
} else {
rfvga |= RFVGA_2 << 2;
vga |= (VGA_6 << 3) | VGA_2;
}
state->gain_level = gain_level;
cx24113_writereg(state, 0x1d, ampout);
cx24113_writereg(state, 0x1f, vga);
cx24113_writereg(state, 0x20, rfvga);
return 1; /* did something */
}
static int cx24113_set_Fref(struct cx24113_state *state, u8 high)
{
u8 xtal = cx24113_readreg(state, 0x02);
if (state->rev == 0x43 && state->vcodiv == VCODIV4)
high = 1;
xtal &= ~0x2;
if (high)
xtal |= high << 1;
return cx24113_writereg(state, 0x02, xtal);
}
static int cx24113_enable(struct cx24113_state *state, u8 enable)
{
u8 r21 = (cx24113_readreg(state, 0x21) & 0xc0) | enable;
if (state->rev == REV_CX24113)
r21 |= (1 << 1);
return cx24113_writereg(state, 0x21, r21);
}
static int cx24113_set_bandwidth(struct cx24113_state *state, u32 bandwidth_khz)
{
u8 r;
if (bandwidth_khz <= 19000)
r = 0x03 << 6;
else if (bandwidth_khz <= 25000)
r = 0x02 << 6;
else
r = 0x01 << 6;
dprintk("bandwidth to be set: %d\n", bandwidth_khz);
bandwidth_khz *= 10;
bandwidth_khz -= 10000;
bandwidth_khz /= 1000;
bandwidth_khz += 5;
bandwidth_khz /= 10;
dprintk("bandwidth: %d %d\n", r >> 6, bandwidth_khz);
r |= bandwidth_khz & 0x3f;
return cx24113_writereg(state, 0x1e, r);
}
static int cx24113_set_clk_inversion(struct cx24113_state *state, u8 on)
{
u8 r = (cx24113_readreg(state, 0x10) & 0x7f) | ((on & 0x1) << 7);
return cx24113_writereg(state, 0x10, r);
}
static int cx24113_get_status(struct dvb_frontend *fe, u32 *status)
{
struct cx24113_state *state = fe->tuner_priv;
u8 r = (cx24113_readreg(state, 0x10) & 0x02) >> 1;
if (r)
*status |= TUNER_STATUS_LOCKED;
dprintk("PLL locked: %d\n", r);
return 0;
}
static u8 cx24113_set_ref_div(struct cx24113_state *state, u8 refdiv)
{
if (state->rev == 0x43 && state->vcodiv == VCODIV4)
refdiv = 2;
return state->refdiv = refdiv;
}
static void cx24113_calc_pll_nf(struct cx24113_state *state, u16 *n, s32 *f)
{
s32 N;
s64 F;
u64 dividend;
u8 R, r;
u8 vcodiv;
u8 factor;
s32 freq_hz = state->frequency * 1000;
if (state->config->xtal_khz < 20000)
factor = 1;
else
factor = 2;
if (state->rev == REV_CX24113) {
if (state->frequency >= 1100000)
vcodiv = VCODIV2;
else
vcodiv = VCODIV4;
} else {
if (state->frequency >= 1165000)
vcodiv = VCODIV2;
else
vcodiv = VCODIV4;
}
state->vcodiv = vcodiv;
dprintk("calculating N/F for %dHz with vcodiv %d\n", freq_hz, vcodiv);
R = 0;
do {
R = cx24113_set_ref_div(state, R + 1);
/* calculate tuner PLL settings: */
N = (freq_hz / 100 * vcodiv) * R;
N /= (state->config->xtal_khz) * factor * 2;
N += 5; /* For round up. */
N /= 10;
N -= 32;
} while (N < 6 && R < 3);
if (N < 6) {
cx_err("strange frequency: N < 6\n");
return;
}
F = freq_hz;
F *= (u64) (R * vcodiv * 262144);
dprintk("1 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
/* do_div needs an u64 as first argument */
dividend = F;
do_div(dividend, state->config->xtal_khz * 1000 * factor * 2);
F = dividend;
dprintk("2 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
F -= (N + 32) * 262144;
dprintk("3 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
if (state->Fwindow_enabled) {
if (F > (262144 / 2 - 1638))
F = 262144 / 2 - 1638;
if (F < (-262144 / 2 + 1638))
F = -262144 / 2 + 1638;
if ((F < 3277 && F > 0) || (F > -3277 && F < 0)) {
F = 0;
r = cx24113_readreg(state, 0x10);
cx24113_writereg(state, 0x10, r | (1 << 6));
}
}
dprintk("4 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
*n = (u16) N;
*f = (s32) F;
}
static void cx24113_set_nfr(struct cx24113_state *state, u16 n, s32 f, u8 r)
{
u8 reg;
cx24113_writereg(state, 0x19, (n >> 1) & 0xff);
reg = ((n & 0x1) << 7) | ((f >> 11) & 0x7f);
cx24113_writereg(state, 0x1a, reg);
cx24113_writereg(state, 0x1b, (f >> 3) & 0xff);
reg = cx24113_readreg(state, 0x1c) & 0x1f;
cx24113_writereg(state, 0x1c, reg | ((f & 0x7) << 5));
cx24113_set_Fref(state, r - 1);
}
static int cx24113_set_frequency(struct cx24113_state *state, u32 frequency)
{
u8 r;
u16 n = 6;
s32 f = 0;
r = cx24113_readreg(state, 0x14);
cx24113_writereg(state, 0x14, r & 0x3f);
r = cx24113_readreg(state, 0x10);
cx24113_writereg(state, 0x10, r & 0xbf);
state->frequency = frequency;
dprintk("tuning to frequency: %d\n", frequency);
cx24113_calc_pll_nf(state, &n, &f);
cx24113_set_nfr(state, n, f, state->refdiv);
r = cx24113_readreg(state, 0x18) & 0xbf;
if (state->vcodiv != VCODIV2)
r |= 1 << 6;
cx24113_writereg(state, 0x18, r);
/* The need for this sleep is not clear. But helps in some cases */
msleep(5);
r = cx24113_readreg(state, 0x1c) & 0xef;
cx24113_writereg(state, 0x1c, r | (1 << 4));
return 0;
}
static int cx24113_init(struct dvb_frontend *fe)
{
struct cx24113_state *state = fe->tuner_priv;
int ret;
state->tuner_gain_thres = -50;
state->gain_level = 255; /* to force a gain-setting initialization */
state->icp_mode = 0;
if (state->config->xtal_khz < 11000) {
state->icp_auto_hi = ICP_LEVEL4;
state->icp_auto_mhi = ICP_LEVEL4;
state->icp_auto_mlow = ICP_LEVEL3;
state->icp_auto_low = ICP_LEVEL3;
} else {
state->icp_auto_hi = ICP_LEVEL4;
state->icp_auto_mhi = ICP_LEVEL4;
state->icp_auto_mlow = ICP_LEVEL3;
state->icp_auto_low = ICP_LEVEL2;
}
state->icp_dig = ICP_LEVEL3;
state->icp_man = ICP_LEVEL1;
state->acp_on = 1;
state->vco_mode = 0;
state->vco_shift = 0;
state->vco_band = VCOBANDSEL_1;
state->bs_delay = 8;
state->bs_freqcnt = 0x0fff;
state->bs_rdiv = 0x0fff;
state->prescaler_mode = 0;
state->lna_gain = LNA_MAX_GAIN;
state->rfvga_bias_ctrl = 1;
state->Fwindow_enabled = 1;
cx24113_set_Fref(state, 0);
cx24113_enable(state, 0x3d);
cx24113_set_parameters(state);
cx24113_set_gain_settings(state, -30);
cx24113_set_bandwidth(state, 18025);
cx24113_set_clk_inversion(state, 1);
if (state->config->xtal_khz >= 40000)
ret = cx24113_writereg(state, 0x02,
(cx24113_readreg(state, 0x02) & 0xfb) | (1 << 2));
else
ret = cx24113_writereg(state, 0x02,
(cx24113_readreg(state, 0x02) & 0xfb) | (0 << 2));
return ret;
}
static int cx24113_set_params(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct cx24113_state *state = fe->tuner_priv;
/* for a ROLL-OFF factor of 0.35, 0.2: 600, 0.25: 625 */
u32 roll_off = 675;
u32 bw;
bw = ((c->symbol_rate/100) * roll_off) / 1000;
bw += (10000000/100) + 5;
bw /= 10;
bw += 1000;
cx24113_set_bandwidth(state, bw);
cx24113_set_frequency(state, c->frequency);
msleep(5);
return cx24113_get_status(fe, &bw);
}
static s8 cx24113_agc_table[2][10] = {
{-54, -41, -35, -30, -25, -21, -16, -10, -6, -2},
{-39, -35, -30, -25, -19, -15, -11, -5, 1, 9},
};
void cx24113_agc_callback(struct dvb_frontend *fe)
{
struct cx24113_state *state = fe->tuner_priv;
s16 s, i;
if (!fe->ops.read_signal_strength)
return;
do {
/* this only works with the current CX24123 implementation */
fe->ops.read_signal_strength(fe, (u16 *) &s);
s >>= 8;
dprintk("signal strength: %d\n", s);
for (i = 0; i < sizeof(cx24113_agc_table[0]); i++)
if (cx24113_agc_table[state->gain_level][i] > s)
break;
s = -25 - i*5;
} while (cx24113_set_gain_settings(state, s));
}
EXPORT_SYMBOL(cx24113_agc_callback);
static int cx24113_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct cx24113_state *state = fe->tuner_priv;
*frequency = state->frequency;
return 0;
}
static void cx24113_release(struct dvb_frontend *fe)
{
struct cx24113_state *state = fe->tuner_priv;
dprintk("\n");
fe->tuner_priv = NULL;
kfree(state);
}
static const struct dvb_tuner_ops cx24113_tuner_ops = {
.info = {
.name = "Conexant CX24113",
.frequency_min_hz = 950 * MHz,
.frequency_max_hz = 2150 * MHz,
.frequency_step_hz = 125 * kHz,
},
.release = cx24113_release,
.init = cx24113_init,
.set_params = cx24113_set_params,
.get_frequency = cx24113_get_frequency,
.get_status = cx24113_get_status,
};
struct dvb_frontend *cx24113_attach(struct dvb_frontend *fe,
const struct cx24113_config *config, struct i2c_adapter *i2c)
{
/* allocate memory for the internal state */
struct cx24113_state *state = kzalloc(sizeof(*state), GFP_KERNEL);
int rc;
if (!state)
return NULL;
/* setup the state */
state->config = config;
state->i2c = i2c;
cx_info("trying to detect myself\n");
/* making a dummy read, because of some expected troubles
* after power on */
cx24113_readreg(state, 0x00);
rc = cx24113_readreg(state, 0x00);
if (rc < 0) {
cx_info("CX24113 not found.\n");
goto error;
}
state->rev = rc;
switch (rc) {
case 0x43:
cx_info("detected CX24113 variant\n");
break;
case REV_CX24113:
cx_info("successfully detected\n");
break;
default:
cx_err("unsupported device id: %x\n", state->rev);
goto error;
}
state->ver = cx24113_readreg(state, 0x01);
cx_info("version: %x\n", state->ver);
/* create dvb_frontend */
memcpy(&fe->ops.tuner_ops, &cx24113_tuner_ops,
sizeof(struct dvb_tuner_ops));
fe->tuner_priv = state;
return fe;
error:
kfree(state);
return NULL;
}
EXPORT_SYMBOL_GPL(cx24113_attach);
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
MODULE_AUTHOR("Patrick Boettcher <[email protected]>");
MODULE_DESCRIPTION("DVB Frontend module for Conexant CX24113/CX24128hardware");
MODULE_LICENSE("GPL");
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