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linux/drivers/media/dvb-frontends/stv0288.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 ST STV0288 demodulator
Copyright (C) 2006 Georg Acher, BayCom GmbH, acher (at) baycom (dot) de
for Reel Multimedia
Copyright (C) 2008 TurboSight.com, Bob Liu <bob@turbosight.com>
Copyright (C) 2008 Igor M. Liplianin <liplianin@me.by>
Removed stb6000 specific tuner code and revised some
procedures.
2010-09-01 Josef Pavlik <josef@pavlik.it>
Fixed diseqc_msg, diseqc_burst and set_tone problems
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <asm/div64.h>
#include <media/dvb_frontend.h>
#include "stv0288.h"
struct stv0288_state {
struct i2c_adapter *i2c;
const struct stv0288_config *config;
struct dvb_frontend frontend;
u8 initialised:1;
u32 tuner_frequency;
u32 symbol_rate;
enum fe_code_rate fec_inner;
int errmode;
};
#define STATUS_BER 0
#define STATUS_UCBLOCKS 1
static int debug;
static int debug_legacy_dish_switch;
#define dprintk(args...) \
do { \
if (debug) \
printk(KERN_DEBUG "stv0288: " args); \
} while (0)
static int stv0288_writeregI(struct stv0288_state *state, u8 reg, u8 data)
{
int ret;
u8 buf[] = { reg, data };
struct i2c_msg msg = {
.addr = state->config->demod_address,
.flags = 0,
.buf = buf,
.len = 2
};
ret = i2c_transfer(state->i2c, &msg, 1);
if (ret != 1)
dprintk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
__func__, reg, data, ret);
return (ret != 1) ? -EREMOTEIO : 0;
}
static int stv0288_write(struct dvb_frontend *fe, const u8 buf[], int len)
{
struct stv0288_state *state = fe->demodulator_priv;
if (len != 2)
return -EINVAL;
return stv0288_writeregI(state, buf[0], buf[1]);
}
static u8 stv0288_readreg(struct stv0288_state *state, u8 reg)
{
int ret;
u8 b0[] = { reg };
u8 b1[] = { 0 };
struct i2c_msg msg[] = {
{
.addr = state->config->demod_address,
.flags = 0,
.buf = b0,
.len = 1
}, {
.addr = state->config->demod_address,
.flags = I2C_M_RD,
.buf = b1,
.len = 1
}
};
ret = i2c_transfer(state->i2c, msg, 2);
if (ret != 2)
dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n",
__func__, reg, ret);
return b1[0];
}
static int stv0288_set_symbolrate(struct dvb_frontend *fe, u32 srate)
{
struct stv0288_state *state = fe->demodulator_priv;
unsigned int temp;
unsigned char b[3];
if ((srate < 1000000) || (srate > 45000000))
return -EINVAL;
stv0288_writeregI(state, 0x22, 0);
stv0288_writeregI(state, 0x23, 0);
stv0288_writeregI(state, 0x2b, 0xff);
stv0288_writeregI(state, 0x2c, 0xf7);
temp = (unsigned int)srate / 1000;
temp = temp * 32768;
temp = temp / 25;
temp = temp / 125;
b[0] = (unsigned char)((temp >> 12) & 0xff);
b[1] = (unsigned char)((temp >> 4) & 0xff);
b[2] = (unsigned char)((temp << 4) & 0xf0);
stv0288_writeregI(state, 0x28, 0x80); /* SFRH */
stv0288_writeregI(state, 0x29, 0); /* SFRM */
stv0288_writeregI(state, 0x2a, 0); /* SFRL */
stv0288_writeregI(state, 0x28, b[0]);
stv0288_writeregI(state, 0x29, b[1]);
stv0288_writeregI(state, 0x2a, b[2]);
dprintk("stv0288: stv0288_set_symbolrate\n");
return 0;
}
static int stv0288_send_diseqc_msg(struct dvb_frontend *fe,
struct dvb_diseqc_master_cmd *m)
{
struct stv0288_state *state = fe->demodulator_priv;
int i;
dprintk("%s\n", __func__);
stv0288_writeregI(state, 0x09, 0);
msleep(30);
stv0288_writeregI(state, 0x05, 0x12);/* modulated mode, single shot */
for (i = 0; i < m->msg_len; i++) {
if (stv0288_writeregI(state, 0x06, m->msg[i]))
return -EREMOTEIO;
}
msleep(m->msg_len*12);
return 0;
}
static int stv0288_send_diseqc_burst(struct dvb_frontend *fe,
enum fe_sec_mini_cmd burst)
{
struct stv0288_state *state = fe->demodulator_priv;
dprintk("%s\n", __func__);
if (stv0288_writeregI(state, 0x05, 0x03))/* burst mode, single shot */
return -EREMOTEIO;
if (stv0288_writeregI(state, 0x06, burst == SEC_MINI_A ? 0x00 : 0xff))
return -EREMOTEIO;
msleep(15);
if (stv0288_writeregI(state, 0x05, 0x12))
return -EREMOTEIO;
return 0;
}
static int stv0288_set_tone(struct dvb_frontend *fe, enum fe_sec_tone_mode tone)
{
struct stv0288_state *state = fe->demodulator_priv;
switch (tone) {
case SEC_TONE_ON:
if (stv0288_writeregI(state, 0x05, 0x10))/* cont carrier */
return -EREMOTEIO;
break;
case SEC_TONE_OFF:
if (stv0288_writeregI(state, 0x05, 0x12))/* burst mode off*/
return -EREMOTEIO;
break;
default:
return -EINVAL;
}
return 0;
}
static u8 stv0288_inittab[] = {
0x01, 0x15,
0x02, 0x20,
0x09, 0x0,
0x0a, 0x4,
0x0b, 0x0,
0x0c, 0x0,
0x0d, 0x0,
0x0e, 0xd4,
0x0f, 0x30,
0x11, 0x80,
0x12, 0x03,
0x13, 0x48,
0x14, 0x84,
0x15, 0x45,
0x16, 0xb7,
0x17, 0x9c,
0x18, 0x0,
0x19, 0xa6,
0x1a, 0x88,
0x1b, 0x8f,
0x1c, 0xf0,
0x20, 0x0b,
0x21, 0x54,
0x22, 0x0,
0x23, 0x0,
0x2b, 0xff,
0x2c, 0xf7,
0x30, 0x0,
0x31, 0x1e,
0x32, 0x14,
0x33, 0x0f,
0x34, 0x09,
0x35, 0x0c,
0x36, 0x05,
0x37, 0x2f,
0x38, 0x16,
0x39, 0xbe,
0x3a, 0x0,
0x3b, 0x13,
0x3c, 0x11,
0x3d, 0x30,
0x40, 0x63,
0x41, 0x04,
0x42, 0x20,
0x43, 0x00,
0x44, 0x00,
0x45, 0x00,
0x46, 0x00,
0x47, 0x00,
0x4a, 0x00,
0x50, 0x10,
0x51, 0x38,
0x52, 0x21,
0x58, 0x54,
0x59, 0x86,
0x5a, 0x0,
0x5b, 0x9b,
0x5c, 0x08,
0x5d, 0x7f,
0x5e, 0x0,
0x5f, 0xff,
0x70, 0x0,
0x71, 0x0,
0x72, 0x0,
0x74, 0x0,
0x75, 0x0,
0x76, 0x0,
0x81, 0x0,
0x82, 0x3f,
0x83, 0x3f,
0x84, 0x0,
0x85, 0x0,
0x88, 0x0,
0x89, 0x0,
0x8a, 0x0,
0x8b, 0x0,
0x8c, 0x0,
0x90, 0x0,
0x91, 0x0,
0x92, 0x0,
0x93, 0x0,
0x94, 0x1c,
0x97, 0x0,
0xa0, 0x48,
0xa1, 0x0,
0xb0, 0xb8,
0xb1, 0x3a,
0xb2, 0x10,
0xb3, 0x82,
0xb4, 0x80,
0xb5, 0x82,
0xb6, 0x82,
0xb7, 0x82,
0xb8, 0x20,
0xb9, 0x0,
0xf0, 0x0,
0xf1, 0x0,
0xf2, 0xc0,
0x51, 0x36,
0x52, 0x09,
0x53, 0x94,
0x54, 0x62,
0x55, 0x29,
0x56, 0x64,
0x57, 0x2b,
0xff, 0xff,
};
static int stv0288_set_voltage(struct dvb_frontend *fe,
enum fe_sec_voltage volt)
{
dprintk("%s: %s\n", __func__,
volt == SEC_VOLTAGE_13 ? "SEC_VOLTAGE_13" :
volt == SEC_VOLTAGE_18 ? "SEC_VOLTAGE_18" : "??");
return 0;
}
static int stv0288_init(struct dvb_frontend *fe)
{
struct stv0288_state *state = fe->demodulator_priv;
int i;
u8 reg;
u8 val;
dprintk("stv0288: init chip\n");
stv0288_writeregI(state, 0x41, 0x04);
msleep(50);
/* we have default inittab */
if (state->config->inittab == NULL) {
for (i = 0; !(stv0288_inittab[i] == 0xff &&
stv0288_inittab[i + 1] == 0xff); i += 2)
stv0288_writeregI(state, stv0288_inittab[i],
stv0288_inittab[i + 1]);
} else {
for (i = 0; ; i += 2) {
reg = state->config->inittab[i];
val = state->config->inittab[i+1];
if (reg == 0xff && val == 0xff)
break;
stv0288_writeregI(state, reg, val);
}
}
return 0;
}
static int stv0288_read_status(struct dvb_frontend *fe, enum fe_status *status)
{
struct stv0288_state *state = fe->demodulator_priv;
u8 sync = stv0288_readreg(state, 0x24);
if (sync == 255)
sync = 0;
dprintk("%s : FE_READ_STATUS : VSTATUS: 0x%02x\n", __func__, sync);
*status = 0;
if (sync & 0x80)
*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
if (sync & 0x10)
*status |= FE_HAS_VITERBI;
if (sync & 0x08) {
*status |= FE_HAS_LOCK;
dprintk("stv0288 has locked\n");
}
return 0;
}
static int stv0288_read_ber(struct dvb_frontend *fe, u32 *ber)
{
struct stv0288_state *state = fe->demodulator_priv;
if (state->errmode != STATUS_BER)
return 0;
*ber = (stv0288_readreg(state, 0x26) << 8) |
stv0288_readreg(state, 0x27);
dprintk("stv0288_read_ber %d\n", *ber);
return 0;
}
static int stv0288_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
{
struct stv0288_state *state = fe->demodulator_priv;
s32 signal = 0xffff - ((stv0288_readreg(state, 0x10) << 8));
signal = signal * 5 / 4;
*strength = (signal > 0xffff) ? 0xffff : (signal < 0) ? 0 : signal;
dprintk("stv0288_read_signal_strength %d\n", *strength);
return 0;
}
static int stv0288_sleep(struct dvb_frontend *fe)
{
struct stv0288_state *state = fe->demodulator_priv;
stv0288_writeregI(state, 0x41, 0x84);
state->initialised = 0;
return 0;
}
static int stv0288_read_snr(struct dvb_frontend *fe, u16 *snr)
{
struct stv0288_state *state = fe->demodulator_priv;
s32 xsnr = 0xffff - ((stv0288_readreg(state, 0x2d) << 8)
| stv0288_readreg(state, 0x2e));
xsnr = 3 * (xsnr - 0xa100);
*snr = (xsnr > 0xffff) ? 0xffff : (xsnr < 0) ? 0 : xsnr;
dprintk("stv0288_read_snr %d\n", *snr);
return 0;
}
static int stv0288_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
struct stv0288_state *state = fe->demodulator_priv;
if (state->errmode != STATUS_BER)
return 0;
*ucblocks = (stv0288_readreg(state, 0x26) << 8) |
stv0288_readreg(state, 0x27);
dprintk("stv0288_read_ber %d\n", *ucblocks);
return 0;
}
static int stv0288_set_frontend(struct dvb_frontend *fe)
{
struct stv0288_state *state = fe->demodulator_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
u8 tda[3], reg, time_out = 0;
s8 tm;
dprintk("%s : FE_SET_FRONTEND\n", __func__);
if (c->delivery_system != SYS_DVBS) {
dprintk("%s: unsupported delivery system selected (%d)\n",
__func__, c->delivery_system);
return -EOPNOTSUPP;
}
if (state->config->set_ts_params)
state->config->set_ts_params(fe, 0);
/* only frequency & symbol_rate are used for tuner*/
if (fe->ops.tuner_ops.set_params) {
fe->ops.tuner_ops.set_params(fe);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
}
udelay(10);
stv0288_set_symbolrate(fe, c->symbol_rate);
/* Carrier lock control register */
stv0288_writeregI(state, 0x15, 0xc5);
tda[2] = 0x0; /* CFRL */
for (tm = -9; tm < 7;) {
/* Viterbi status */
reg = stv0288_readreg(state, 0x24);
if (reg & 0x8)
break;
if (reg & 0x80) {
time_out++;
if (time_out > 10)
break;
tda[2] += 40;
if (tda[2] < 40)
tm++;
} else {
tm++;
tda[2] = 0;
time_out = 0;
}
tda[1] = (unsigned char)tm;
stv0288_writeregI(state, 0x2b, tda[1]);
stv0288_writeregI(state, 0x2c, tda[2]);
msleep(30);
}
state->tuner_frequency = c->frequency;
state->fec_inner = FEC_AUTO;
state->symbol_rate = c->symbol_rate;
return 0;
}
static int stv0288_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
{
struct stv0288_state *state = fe->demodulator_priv;
if (enable)
stv0288_writeregI(state, 0x01, 0xb5);
else
stv0288_writeregI(state, 0x01, 0x35);
udelay(1);
return 0;
}
static void stv0288_release(struct dvb_frontend *fe)
{
struct stv0288_state *state = fe->demodulator_priv;
kfree(state);
}
static const struct dvb_frontend_ops stv0288_ops = {
.delsys = { SYS_DVBS },
.info = {
.name = "ST STV0288 DVB-S",
.frequency_min_hz = 950 * MHz,
.frequency_max_hz = 2150 * MHz,
.frequency_stepsize_hz = 1 * MHz,
.symbol_rate_min = 1000000,
.symbol_rate_max = 45000000,
.symbol_rate_tolerance = 500, /* ppm */
.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
FE_CAN_QPSK |
FE_CAN_FEC_AUTO
},
.release = stv0288_release,
.init = stv0288_init,
.sleep = stv0288_sleep,
.write = stv0288_write,
.i2c_gate_ctrl = stv0288_i2c_gate_ctrl,
.read_status = stv0288_read_status,
.read_ber = stv0288_read_ber,
.read_signal_strength = stv0288_read_signal_strength,
.read_snr = stv0288_read_snr,
.read_ucblocks = stv0288_read_ucblocks,
.diseqc_send_master_cmd = stv0288_send_diseqc_msg,
.diseqc_send_burst = stv0288_send_diseqc_burst,
.set_tone = stv0288_set_tone,
.set_voltage = stv0288_set_voltage,
.set_frontend = stv0288_set_frontend,
};
struct dvb_frontend *stv0288_attach(const struct stv0288_config *config,
struct i2c_adapter *i2c)
{
struct stv0288_state *state = NULL;
int id;
/* allocate memory for the internal state */
state = kzalloc(sizeof(struct stv0288_state), GFP_KERNEL);
if (state == NULL)
goto error;
/* setup the state */
state->config = config;
state->i2c = i2c;
state->initialised = 0;
state->tuner_frequency = 0;
state->symbol_rate = 0;
state->fec_inner = 0;
state->errmode = STATUS_BER;
stv0288_writeregI(state, 0x41, 0x04);
msleep(200);
id = stv0288_readreg(state, 0x00);
dprintk("stv0288 id %x\n", id);
/* register 0x00 contains 0x11 for STV0288 */
if (id != 0x11)
goto error;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &stv0288_ops,
sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
error:
kfree(state);
return NULL;
}
EXPORT_SYMBOL_GPL(stv0288_attach);
module_param(debug_legacy_dish_switch, int, 0444);
MODULE_PARM_DESC(debug_legacy_dish_switch,
"Enable timing analysis for Dish Network legacy switches");
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
MODULE_DESCRIPTION("ST STV0288 DVB Demodulator driver");
MODULE_AUTHOR("Georg Acher, Bob Liu, Igor liplianin");
MODULE_LICENSE("GPL");
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