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linux/drivers/media/tuners/mc44s803.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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8.4 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for Freescale MC44S803 Low Power CMOS Broadband Tuner
*
* Copyright (c) 2009 Jochen Friedrich <jochen@scram.de>
*/
#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 "mc44s803.h"
#include "mc44s803_priv.h"
#define mc_printk(level, format, arg...) \
printk(level "mc44s803: " format , ## arg)
/* Writes a single register */
static int mc44s803_writereg(struct mc44s803_priv *priv, u32 val)
{
u8 buf[3];
struct i2c_msg msg = {
.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 3
};
buf[0] = (val & 0xff0000) >> 16;
buf[1] = (val & 0xff00) >> 8;
buf[2] = (val & 0xff);
if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
mc_printk(KERN_WARNING, "I2C write failed\n");
return -EREMOTEIO;
}
return 0;
}
/* Reads a single register */
static int mc44s803_readreg(struct mc44s803_priv *priv, u8 reg, u32 *val)
{
u32 wval;
u8 buf[3];
int ret;
struct i2c_msg msg[] = {
{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
.buf = buf, .len = 3 },
};
wval = MC44S803_REG_SM(MC44S803_REG_DATAREG, MC44S803_ADDR) |
MC44S803_REG_SM(reg, MC44S803_D);
ret = mc44s803_writereg(priv, wval);
if (ret)
return ret;
if (i2c_transfer(priv->i2c, msg, 1) != 1) {
mc_printk(KERN_WARNING, "I2C read failed\n");
return -EREMOTEIO;
}
*val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
return 0;
}
static void mc44s803_release(struct dvb_frontend *fe)
{
struct mc44s803_priv *priv = fe->tuner_priv;
fe->tuner_priv = NULL;
kfree(priv);
}
static int mc44s803_init(struct dvb_frontend *fe)
{
struct mc44s803_priv *priv = fe->tuner_priv;
u32 val;
int err;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
/* Reset chip */
val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR) |
MC44S803_REG_SM(1, MC44S803_RS);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
/* Power Up and Start Osc */
val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
MC44S803_REG_SM(0xC0, MC44S803_REFOSC) |
MC44S803_REG_SM(1, MC44S803_OSCSEL);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
val = MC44S803_REG_SM(MC44S803_REG_POWER, MC44S803_ADDR) |
MC44S803_REG_SM(0x200, MC44S803_POWER);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
msleep(10);
val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
MC44S803_REG_SM(0x40, MC44S803_REFOSC) |
MC44S803_REG_SM(1, MC44S803_OSCSEL);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
msleep(20);
/* Setup Mixer */
val = MC44S803_REG_SM(MC44S803_REG_MIXER, MC44S803_ADDR) |
MC44S803_REG_SM(1, MC44S803_TRI_STATE) |
MC44S803_REG_SM(0x7F, MC44S803_MIXER_RES);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
/* Setup Cirquit Adjust */
val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
MC44S803_REG_SM(1, MC44S803_G1) |
MC44S803_REG_SM(1, MC44S803_G3) |
MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
MC44S803_REG_SM(1, MC44S803_G6) |
MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
MC44S803_REG_SM(0x3, MC44S803_LP) |
MC44S803_REG_SM(1, MC44S803_CLRF) |
MC44S803_REG_SM(1, MC44S803_CLIF);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
MC44S803_REG_SM(1, MC44S803_G1) |
MC44S803_REG_SM(1, MC44S803_G3) |
MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
MC44S803_REG_SM(1, MC44S803_G6) |
MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
MC44S803_REG_SM(0x3, MC44S803_LP);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
/* Setup Digtune */
val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
MC44S803_REG_SM(3, MC44S803_XOD);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
/* Setup AGC */
val = MC44S803_REG_SM(MC44S803_REG_LNAAGC, MC44S803_ADDR) |
MC44S803_REG_SM(1, MC44S803_AT1) |
MC44S803_REG_SM(1, MC44S803_AT2) |
MC44S803_REG_SM(1, MC44S803_AGC_AN_DIG) |
MC44S803_REG_SM(1, MC44S803_AGC_READ_EN) |
MC44S803_REG_SM(1, MC44S803_LNA0);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
return 0;
exit:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
mc_printk(KERN_WARNING, "I/O Error\n");
return err;
}
static int mc44s803_set_params(struct dvb_frontend *fe)
{
struct mc44s803_priv *priv = fe->tuner_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
u32 r1, r2, n1, n2, lo1, lo2, freq, val;
int err;
priv->frequency = c->frequency;
r1 = MC44S803_OSC / 1000000;
r2 = MC44S803_OSC / 100000;
n1 = (c->frequency + MC44S803_IF1 + 500000) / 1000000;
freq = MC44S803_OSC / r1 * n1;
lo1 = ((60 * n1) + (r1 / 2)) / r1;
freq = freq - c->frequency;
n2 = (freq - MC44S803_IF2 + 50000) / 100000;
lo2 = ((60 * n2) + (r2 / 2)) / r2;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
val = MC44S803_REG_SM(MC44S803_REG_REFDIV, MC44S803_ADDR) |
MC44S803_REG_SM(r1-1, MC44S803_R1) |
MC44S803_REG_SM(r2-1, MC44S803_R2) |
MC44S803_REG_SM(1, MC44S803_REFBUF_EN);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
val = MC44S803_REG_SM(MC44S803_REG_LO1, MC44S803_ADDR) |
MC44S803_REG_SM(n1-2, MC44S803_LO1);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
val = MC44S803_REG_SM(MC44S803_REG_LO2, MC44S803_ADDR) |
MC44S803_REG_SM(n2-2, MC44S803_LO2);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
MC44S803_REG_SM(1, MC44S803_DA) |
MC44S803_REG_SM(lo1, MC44S803_LO_REF) |
MC44S803_REG_SM(1, MC44S803_AT);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
MC44S803_REG_SM(2, MC44S803_DA) |
MC44S803_REG_SM(lo2, MC44S803_LO_REF) |
MC44S803_REG_SM(1, MC44S803_AT);
err = mc44s803_writereg(priv, val);
if (err)
goto exit;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
return 0;
exit:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
mc_printk(KERN_WARNING, "I/O Error\n");
return err;
}
static int mc44s803_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct mc44s803_priv *priv = fe->tuner_priv;
*frequency = priv->frequency;
return 0;
}
static int mc44s803_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
*frequency = MC44S803_IF2; /* 36.125 MHz */
return 0;
}
static const struct dvb_tuner_ops mc44s803_tuner_ops = {
.info = {
.name = "Freescale MC44S803",
.frequency_min_hz = 48 * MHz,
.frequency_max_hz = 1000 * MHz,
.frequency_step_hz = 100 * kHz,
},
.release = mc44s803_release,
.init = mc44s803_init,
.set_params = mc44s803_set_params,
.get_frequency = mc44s803_get_frequency,
.get_if_frequency = mc44s803_get_if_frequency,
};
/* This functions tries to identify a MC44S803 tuner by reading the ID
register. This is hasty. */
struct dvb_frontend *mc44s803_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c, struct mc44s803_config *cfg)
{
struct mc44s803_priv *priv;
u32 reg;
u8 id;
int ret;
reg = 0;
priv = kzalloc(sizeof(struct mc44s803_priv), GFP_KERNEL);
if (priv == NULL)
return NULL;
priv->cfg = cfg;
priv->i2c = i2c;
priv->fe = fe;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
ret = mc44s803_readreg(priv, MC44S803_REG_ID, &reg);
if (ret)
goto error;
id = MC44S803_REG_MS(reg, MC44S803_ID);
if (id != 0x14) {
mc_printk(KERN_ERR, "unsupported ID (%x should be 0x14)\n",
id);
goto error;
}
mc_printk(KERN_INFO, "successfully identified (ID = %x)\n", id);
memcpy(&fe->ops.tuner_ops, &mc44s803_tuner_ops,
sizeof(struct dvb_tuner_ops));
fe->tuner_priv = priv;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
return fe;
error:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
kfree(priv);
return NULL;
}
EXPORT_SYMBOL_GPL(mc44s803_attach);
MODULE_AUTHOR("Jochen Friedrich");
MODULE_DESCRIPTION("Freescale MC44S803 silicon tuner driver");
MODULE_LICENSE("GPL");
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