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linux/drivers/media/tuners/mt2060.c
Greg Kroah-Hartman 86495af117 media: dvb: symbol fixup for dvb_attach() 
In commit 9011e49d54 ("modules: only allow symbol_get of
EXPORT_SYMBOL_GPL modules") the use of symbol_get is properly restricted
to GPL-only marked symbols.  This interacts oddly with the DVB logic
which only uses dvb_attach() to load the dvb driver which then uses
symbol_get().

Fix this up by properly marking all of the dvb_attach attach symbols as
EXPORT_SYMBOL_GPL().

Fixes: 9011e49d54 ("modules: only allow symbol_get of EXPORT_SYMBOL_GPL modules")
Cc: stable <stable@kernel.org>
Reported-by: Stefan Lippers-Hollmann <s.l-h@gmx.de>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: linux-media@vger.kernel.org
Cc: linux-modules@vger.kernel.org
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Link: https://lore.kernel.org/r/20230908092035.3815268-2-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-09 08:15:11 +01:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for Microtune MT2060 "Single chip dual conversion broadband tuner"
*
* Copyright (c) 2006 Olivier DANET <odanet@caramail.com>
*/
/* In that file, frequencies are expressed in kiloHertz to avoid 32 bits overflows */
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/dvb/frontend.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <media/dvb_frontend.h>
#include "mt2060.h"
#include "mt2060_priv.h"
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
#define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2060: " args); printk("\n"); }} while (0)
// Reads a single register
static int mt2060_readreg(struct mt2060_priv *priv, u8 reg, u8 *val)
{
struct i2c_msg msg[2] = {
{ .addr = priv->cfg->i2c_address, .flags = 0, .len = 1 },
{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .len = 1 },
};
int rc = 0;
u8 *b;
b = kmalloc(2, GFP_KERNEL);
if (!b)
return -ENOMEM;
b[0] = reg;
b[1] = 0;
msg[0].buf = b;
msg[1].buf = b + 1;
if (i2c_transfer(priv->i2c, msg, 2) != 2) {
printk(KERN_WARNING "mt2060 I2C read failed\n");
rc = -EREMOTEIO;
}
*val = b[1];
kfree(b);
return rc;
}
// Writes a single register
static int mt2060_writereg(struct mt2060_priv *priv, u8 reg, u8 val)
{
struct i2c_msg msg = {
.addr = priv->cfg->i2c_address, .flags = 0, .len = 2
};
u8 *buf;
int rc = 0;
buf = kmalloc(2, GFP_KERNEL);
if (!buf)
return -ENOMEM;
buf[0] = reg;
buf[1] = val;
msg.buf = buf;
if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
printk(KERN_WARNING "mt2060 I2C write failed\n");
rc = -EREMOTEIO;
}
kfree(buf);
return rc;
}
// Writes a set of consecutive registers
static int mt2060_writeregs(struct mt2060_priv *priv,u8 *buf, u8 len)
{
int rem, val_len;
u8 *xfer_buf;
int rc = 0;
struct i2c_msg msg = {
.addr = priv->cfg->i2c_address, .flags = 0
};
xfer_buf = kmalloc(16, GFP_KERNEL);
if (!xfer_buf)
return -ENOMEM;
msg.buf = xfer_buf;
for (rem = len - 1; rem > 0; rem -= priv->i2c_max_regs) {
val_len = min_t(int, rem, priv->i2c_max_regs);
msg.len = 1 + val_len;
xfer_buf[0] = buf[0] + len - 1 - rem;
memcpy(&xfer_buf[1], &buf[1 + len - 1 - rem], val_len);
if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
printk(KERN_WARNING "mt2060 I2C write failed (len=%i)\n", val_len);
rc = -EREMOTEIO;
break;
}
}
kfree(xfer_buf);
return rc;
}
// Initialisation sequences
// LNABAND=3, NUM1=0x3C, DIV1=0x74, NUM2=0x1080, DIV2=0x49
static u8 mt2060_config1[] = {
REG_LO1C1,
0x3F, 0x74, 0x00, 0x08, 0x93
};
// FMCG=2, GP2=0, GP1=0
static u8 mt2060_config2[] = {
REG_MISC_CTRL,
0x20, 0x1E, 0x30, 0xff, 0x80, 0xff, 0x00, 0x2c, 0x42
};
// VGAG=3, V1CSE=1
#ifdef MT2060_SPURCHECK
/* The function below calculates the frequency offset between the output frequency if2
and the closer cross modulation subcarrier between lo1 and lo2 up to the tenth harmonic */
static int mt2060_spurcalc(u32 lo1,u32 lo2,u32 if2)
{
int I,J;
int dia,diamin,diff;
diamin=1000000;
for (I = 1; I < 10; I++) {
J = ((2*I*lo1)/lo2+1)/2;
diff = I*(int)lo1-J*(int)lo2;
if (diff < 0) diff=-diff;
dia = (diff-(int)if2);
if (dia < 0) dia=-dia;
if (diamin > dia) diamin=dia;
}
return diamin;
}
#define BANDWIDTH 4000 // kHz
/* Calculates the frequency offset to add to avoid spurs. Returns 0 if no offset is needed */
static int mt2060_spurcheck(u32 lo1,u32 lo2,u32 if2)
{
u32 Spur,Sp1,Sp2;
int I,J;
I=0;
J=1000;
Spur=mt2060_spurcalc(lo1,lo2,if2);
if (Spur < BANDWIDTH) {
/* Potential spurs detected */
dprintk("Spurs before : f_lo1: %d f_lo2: %d (kHz)",
(int)lo1,(int)lo2);
I=1000;
Sp1 = mt2060_spurcalc(lo1+I,lo2+I,if2);
Sp2 = mt2060_spurcalc(lo1-I,lo2-I,if2);
if (Sp1 < Sp2) {
J=-J; I=-I; Spur=Sp2;
} else
Spur=Sp1;
while (Spur < BANDWIDTH) {
I += J;
Spur = mt2060_spurcalc(lo1+I,lo2+I,if2);
}
dprintk("Spurs after : f_lo1: %d f_lo2: %d (kHz)",
(int)(lo1+I),(int)(lo2+I));
}
return I;
}
#endif
#define IF2 36150 // IF2 frequency = 36.150 MHz
#define FREF 16000 // Quartz oscillator 16 MHz
static int mt2060_set_params(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct mt2060_priv *priv;
int i=0;
u32 freq;
u8 lnaband;
u32 f_lo1,f_lo2;
u32 div1,num1,div2,num2;
u8 b[8];
u32 if1;
priv = fe->tuner_priv;
if1 = priv->if1_freq;
b[0] = REG_LO1B1;
b[1] = 0xFF;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
mt2060_writeregs(priv,b,2);
freq = c->frequency / 1000; /* Hz -> kHz */
f_lo1 = freq + if1 * 1000;
f_lo1 = (f_lo1 / 250) * 250;
f_lo2 = f_lo1 - freq - IF2;
// From the Comtech datasheet, the step used is 50kHz. The tuner chip could be more precise
f_lo2 = ((f_lo2 + 25) / 50) * 50;
priv->frequency = (f_lo1 - f_lo2 - IF2) * 1000;
#ifdef MT2060_SPURCHECK
// LO-related spurs detection and correction
num1 = mt2060_spurcheck(f_lo1,f_lo2,IF2);
f_lo1 += num1;
f_lo2 += num1;
#endif
//Frequency LO1 = 16MHz * (DIV1 + NUM1/64 )
num1 = f_lo1 / (FREF / 64);
div1 = num1 / 64;
num1 &= 0x3f;
// Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 )
num2 = f_lo2 * 64 / (FREF / 128);
div2 = num2 / 8192;
num2 &= 0x1fff;
if (freq <= 95000) lnaband = 0xB0; else
if (freq <= 180000) lnaband = 0xA0; else
if (freq <= 260000) lnaband = 0x90; else
if (freq <= 335000) lnaband = 0x80; else
if (freq <= 425000) lnaband = 0x70; else
if (freq <= 480000) lnaband = 0x60; else
if (freq <= 570000) lnaband = 0x50; else
if (freq <= 645000) lnaband = 0x40; else
if (freq <= 730000) lnaband = 0x30; else
if (freq <= 810000) lnaband = 0x20; else lnaband = 0x10;
b[0] = REG_LO1C1;
b[1] = lnaband | ((num1 >>2) & 0x0F);
b[2] = div1;
b[3] = (num2 & 0x0F) | ((num1 & 3) << 4);
b[4] = num2 >> 4;
b[5] = ((num2 >>12) & 1) | (div2 << 1);
dprintk("IF1: %dMHz",(int)if1);
dprintk("PLL freq=%dkHz f_lo1=%dkHz f_lo2=%dkHz",(int)freq,(int)f_lo1,(int)f_lo2);
dprintk("PLL div1=%d num1=%d div2=%d num2=%d",(int)div1,(int)num1,(int)div2,(int)num2);
dprintk("PLL [1..5]: %2x %2x %2x %2x %2x",(int)b[1],(int)b[2],(int)b[3],(int)b[4],(int)b[5]);
mt2060_writeregs(priv,b,6);
//Waits for pll lock or timeout
i = 0;
do {
mt2060_readreg(priv,REG_LO_STATUS,b);
if ((b[0] & 0x88)==0x88)
break;
msleep(4);
i++;
} while (i<10);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
return 0;
}
static void mt2060_calibrate(struct mt2060_priv *priv)
{
u8 b = 0;
int i = 0;
if (mt2060_writeregs(priv,mt2060_config1,sizeof(mt2060_config1)))
return;
if (mt2060_writeregs(priv,mt2060_config2,sizeof(mt2060_config2)))
return;
/* initialize the clock output */
mt2060_writereg(priv, REG_VGAG, (priv->cfg->clock_out << 6) | 0x30);
do {
b |= (1 << 6); // FM1SS;
mt2060_writereg(priv, REG_LO2C1,b);
msleep(20);
if (i == 0) {
b |= (1 << 7); // FM1CA;
mt2060_writereg(priv, REG_LO2C1,b);
b &= ~(1 << 7); // FM1CA;
msleep(20);
}
b &= ~(1 << 6); // FM1SS
mt2060_writereg(priv, REG_LO2C1,b);
msleep(20);
i++;
} while (i < 9);
i = 0;
while (i++ < 10 && mt2060_readreg(priv, REG_MISC_STAT, &b) == 0 && (b & (1 << 6)) == 0)
msleep(20);
if (i <= 10) {
mt2060_readreg(priv, REG_FM_FREQ, &priv->fmfreq); // now find out, what is fmreq used for :)
dprintk("calibration was successful: %d", (int)priv->fmfreq);
} else
dprintk("FMCAL timed out");
}
static int mt2060_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct mt2060_priv *priv = fe->tuner_priv;
*frequency = priv->frequency;
return 0;
}
static int mt2060_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
*frequency = IF2 * 1000;
return 0;
}
static int mt2060_init(struct dvb_frontend *fe)
{
struct mt2060_priv *priv = fe->tuner_priv;
int ret;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
if (priv->sleep) {
ret = mt2060_writereg(priv, REG_MISC_CTRL, 0x20);
if (ret)
goto err_i2c_gate_ctrl;
}
ret = mt2060_writereg(priv, REG_VGAG,
(priv->cfg->clock_out << 6) | 0x33);
err_i2c_gate_ctrl:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
return ret;
}
static int mt2060_sleep(struct dvb_frontend *fe)
{
struct mt2060_priv *priv = fe->tuner_priv;
int ret;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
ret = mt2060_writereg(priv, REG_VGAG,
(priv->cfg->clock_out << 6) | 0x30);
if (ret)
goto err_i2c_gate_ctrl;
if (priv->sleep)
ret = mt2060_writereg(priv, REG_MISC_CTRL, 0xe8);
err_i2c_gate_ctrl:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
return ret;
}
static void mt2060_release(struct dvb_frontend *fe)
{
kfree(fe->tuner_priv);
fe->tuner_priv = NULL;
}
static const struct dvb_tuner_ops mt2060_tuner_ops = {
.info = {
.name = "Microtune MT2060",
.frequency_min_hz = 48 * MHz,
.frequency_max_hz = 860 * MHz,
.frequency_step_hz = 50 * kHz,
},
.release = mt2060_release,
.init = mt2060_init,
.sleep = mt2060_sleep,
.set_params = mt2060_set_params,
.get_frequency = mt2060_get_frequency,
.get_if_frequency = mt2060_get_if_frequency,
};
/* This functions tries to identify a MT2060 tuner by reading the PART/REV register. This is hasty. */
struct dvb_frontend * mt2060_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2060_config *cfg, u16 if1)
{
struct mt2060_priv *priv = NULL;
u8 id = 0;
priv = kzalloc(sizeof(struct mt2060_priv), GFP_KERNEL);
if (priv == NULL)
return NULL;
priv->cfg = cfg;
priv->i2c = i2c;
priv->if1_freq = if1;
priv->i2c_max_regs = ~0;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
if (mt2060_readreg(priv,REG_PART_REV,&id) != 0) {
kfree(priv);
return NULL;
}
if (id != PART_REV) {
kfree(priv);
return NULL;
}
printk(KERN_INFO "MT2060: successfully identified (IF1 = %d)\n", if1);
memcpy(&fe->ops.tuner_ops, &mt2060_tuner_ops, sizeof(struct dvb_tuner_ops));
fe->tuner_priv = priv;
mt2060_calibrate(priv);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
return fe;
}
EXPORT_SYMBOL_GPL(mt2060_attach);
static int mt2060_probe(struct i2c_client *client)
{
struct mt2060_platform_data *pdata = client->dev.platform_data;
struct dvb_frontend *fe;
struct mt2060_priv *dev;
int ret;
u8 chip_id;
dev_dbg(&client->dev, "\n");
if (!pdata) {
dev_err(&client->dev, "Cannot proceed without platform data\n");
ret = -EINVAL;
goto err;
}
dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
if (!dev) {
ret = -ENOMEM;
goto err;
}
fe = pdata->dvb_frontend;
dev->config.i2c_address = client->addr;
dev->config.clock_out = pdata->clock_out;
dev->cfg = &dev->config;
dev->i2c = client->adapter;
dev->if1_freq = pdata->if1 ? pdata->if1 : 1220;
dev->client = client;
dev->i2c_max_regs = pdata->i2c_write_max ? pdata->i2c_write_max - 1 : ~0;
dev->sleep = true;
ret = mt2060_readreg(dev, REG_PART_REV, &chip_id);
if (ret) {
ret = -ENODEV;
goto err;
}
dev_dbg(&client->dev, "chip id=%02x\n", chip_id);
if (chip_id != PART_REV) {
ret = -ENODEV;
goto err;
}
/* Power on, calibrate, sleep */
ret = mt2060_writereg(dev, REG_MISC_CTRL, 0x20);
if (ret)
goto err;
mt2060_calibrate(dev);
ret = mt2060_writereg(dev, REG_MISC_CTRL, 0xe8);
if (ret)
goto err;
dev_info(&client->dev, "Microtune MT2060 successfully identified\n");
memcpy(&fe->ops.tuner_ops, &mt2060_tuner_ops, sizeof(fe->ops.tuner_ops));
fe->ops.tuner_ops.release = NULL;
fe->tuner_priv = dev;
i2c_set_clientdata(client, dev);
return 0;
err:
dev_dbg(&client->dev, "failed=%d\n", ret);
return ret;
}
static void mt2060_remove(struct i2c_client *client)
{
dev_dbg(&client->dev, "\n");
}
static const struct i2c_device_id mt2060_id_table[] = {
{"mt2060", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, mt2060_id_table);
static struct i2c_driver mt2060_driver = {
.driver = {
.name = "mt2060",
.suppress_bind_attrs = true,
},
.probe = mt2060_probe,
.remove = mt2060_remove,
.id_table = mt2060_id_table,
};
module_i2c_driver(mt2060_driver);
MODULE_AUTHOR("Olivier DANET");
MODULE_DESCRIPTION("Microtune MT2060 silicon tuner driver");
MODULE_LICENSE("GPL");
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