AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-16 07:27:20 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity
7369bbf262
linux_dsm_epyc7002/drivers/media/dvb-frontends/stv6110x.c
Arnd Bergmann 3cd890dbe2 media: dvb-frontends: fix i2c access helpers for KASAN 
A typical code fragment was copied across many dvb-frontend drivers and
causes large stack frames when built with with CONFIG_KASAN on gcc-5/6/7:

drivers/media/dvb-frontends/cxd2841er.c:3225:1: error: the frame size of 3992 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]
drivers/media/dvb-frontends/cxd2841er.c:3404:1: error: the frame size of 3136 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]
drivers/media/dvb-frontends/stv0367.c:3143:1: error: the frame size of 4016 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]
drivers/media/dvb-frontends/stv090x.c:3430:1: error: the frame size of 5312 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]
drivers/media/dvb-frontends/stv090x.c:4248:1: error: the frame size of 4872 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]

gcc-8 now solves this by consolidating the stack slots for the argument
variables, but on older compilers we can get the same behavior by taking
the pointer of a local variable rather than the inline function argument.

Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715

Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-15 11:53:50 -05:00

417 lines
12 KiB
C
Raw Blame History

/*
STV6110(A) Silicon tuner driver
Copyright (C) Manu Abraham <abraham.manu@gmail.com>
Copyright (C) ST Microelectronics
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "dvb_frontend.h"
#include "stv6110x_reg.h"
#include "stv6110x.h"
#include "stv6110x_priv.h"
/* Max transfer size done by I2C transfer functions */
#define MAX_XFER_SIZE 64
static unsigned int verbose;
module_param(verbose, int, 0644);
MODULE_PARM_DESC(verbose, "Set Verbosity level");
static int stv6110x_read_reg(struct stv6110x_state *stv6110x, u8 reg, u8 *data)
{
int ret;
const struct stv6110x_config *config = stv6110x->config;
u8 b0[] = { reg };
u8 b1[] = { 0 };
struct i2c_msg msg[] = {
{ .addr = config->addr, .flags = 0, .buf = b0, .len = 1 },
{ .addr = config->addr, .flags = I2C_M_RD, .buf = b1, .len = 1 }
};
ret = i2c_transfer(stv6110x->i2c, msg, 2);
if (ret != 2) {
dprintk(FE_ERROR, 1, "I/O Error");
return -EREMOTEIO;
}
*data = b1[0];
return 0;
}
static int stv6110x_write_regs(struct stv6110x_state *stv6110x, int start, u8 data[], int len)
{
int ret;
const struct stv6110x_config *config = stv6110x->config;
u8 buf[MAX_XFER_SIZE];
struct i2c_msg msg = {
.addr = config->addr,
.flags = 0,
.buf = buf,
.len = len + 1
};
if (1 + len > sizeof(buf)) {
printk(KERN_WARNING
"%s: i2c wr: len=%d is too big!\n",
KBUILD_MODNAME, len);
return -EINVAL;
}
if (start + len > 8)
return -EINVAL;
buf[0] = start;
memcpy(&buf[1], data, len);
ret = i2c_transfer(stv6110x->i2c, &msg, 1);
if (ret != 1) {
dprintk(FE_ERROR, 1, "I/O Error");
return -EREMOTEIO;
}
return 0;
}
static int stv6110x_write_reg(struct stv6110x_state *stv6110x, u8 reg, u8 data)
{
u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
return stv6110x_write_regs(stv6110x, reg, &tmp, 1);
}
static int stv6110x_init(struct dvb_frontend *fe)
{
struct stv6110x_state *stv6110x = fe->tuner_priv;
int ret;
ret = stv6110x_write_regs(stv6110x, 0, stv6110x->regs,
ARRAY_SIZE(stv6110x->regs));
if (ret < 0) {
dprintk(FE_ERROR, 1, "Initialization failed");
return -1;
}
return 0;
}
static int stv6110x_set_frequency(struct dvb_frontend *fe, u32 frequency)
{
struct stv6110x_state *stv6110x = fe->tuner_priv;
u32 rDiv, divider;
s32 pVal, pCalc, rDivOpt = 0, pCalcOpt = 1000;
u8 i;
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_K, (REFCLOCK_MHz - 16));
if (frequency <= 1023000) {
STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 1);
STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 0);
pVal = 40;
} else if (frequency <= 1300000) {
STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 1);
STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 1);
pVal = 40;
} else if (frequency <= 2046000) {
STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 0);
STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 0);
pVal = 20;
} else {
STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 0);
STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 1);
pVal = 20;
}
for (rDiv = 0; rDiv <= 3; rDiv++) {
pCalc = (REFCLOCK_kHz / 100) / R_DIV(rDiv);
if ((abs((s32)(pCalc - pVal))) < (abs((s32)(pCalcOpt - pVal))))
rDivOpt = rDiv;
pCalcOpt = (REFCLOCK_kHz / 100) / R_DIV(rDivOpt);
}
divider = (frequency * R_DIV(rDivOpt) * pVal) / REFCLOCK_kHz;
divider = (divider + 5) / 10;
STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_R_DIV, rDivOpt);
STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_N_DIV_11_8, MSB(divider));
STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG0], TNG0_N_DIV_7_0, LSB(divider));
/* VCO Auto calibration */
STV6110x_SETFIELD(stv6110x->regs[STV6110x_STAT1], STAT1_CALVCO_STRT, 1);
stv6110x_write_reg(stv6110x, STV6110x_CTRL1, stv6110x->regs[STV6110x_CTRL1]);
stv6110x_write_reg(stv6110x, STV6110x_TNG1, stv6110x->regs[STV6110x_TNG1]);
stv6110x_write_reg(stv6110x, STV6110x_TNG0, stv6110x->regs[STV6110x_TNG0]);
stv6110x_write_reg(stv6110x, STV6110x_STAT1, stv6110x->regs[STV6110x_STAT1]);
for (i = 0; i < TRIALS; i++) {
stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);
if (!STV6110x_GETFIELD(STAT1_CALVCO_STRT, stv6110x->regs[STV6110x_STAT1]))
break;
msleep(1);
}
return 0;
}
static int stv6110x_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct stv6110x_state *stv6110x = fe->tuner_priv;
stv6110x_read_reg(stv6110x, STV6110x_TNG1, &stv6110x->regs[STV6110x_TNG1]);
stv6110x_read_reg(stv6110x, STV6110x_TNG0, &stv6110x->regs[STV6110x_TNG0]);
*frequency = (MAKEWORD16(STV6110x_GETFIELD(TNG1_N_DIV_11_8, stv6110x->regs[STV6110x_TNG1]),
STV6110x_GETFIELD(TNG0_N_DIV_7_0, stv6110x->regs[STV6110x_TNG0]))) * REFCLOCK_kHz;
*frequency /= (1 << (STV6110x_GETFIELD(TNG1_R_DIV, stv6110x->regs[STV6110x_TNG1]) +
STV6110x_GETFIELD(TNG1_DIV4SEL, stv6110x->regs[STV6110x_TNG1])));
*frequency >>= 2;
return 0;
}
static int stv6110x_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
{
struct stv6110x_state *stv6110x = fe->tuner_priv;
u32 halfbw;
u8 i;
halfbw = bandwidth >> 1;
if (halfbw > 36000000)
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, 31); /* LPF */
else if (halfbw < 5000000)
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, 0); /* LPF */
else
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, ((halfbw / 1000000) - 5)); /* LPF */
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_RCCLK_OFF, 0x0); /* cal. clk activated */
STV6110x_SETFIELD(stv6110x->regs[STV6110x_STAT1], STAT1_CALRC_STRT, 0x1); /* LPF auto cal */
stv6110x_write_reg(stv6110x, STV6110x_CTRL3, stv6110x->regs[STV6110x_CTRL3]);
stv6110x_write_reg(stv6110x, STV6110x_STAT1, stv6110x->regs[STV6110x_STAT1]);
for (i = 0; i < TRIALS; i++) {
stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);
if (!STV6110x_GETFIELD(STAT1_CALRC_STRT, stv6110x->regs[STV6110x_STAT1]))
break;
msleep(1);
}
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_RCCLK_OFF, 0x1); /* cal. done */
stv6110x_write_reg(stv6110x, STV6110x_CTRL3, stv6110x->regs[STV6110x_CTRL3]);
return 0;
}
static int stv6110x_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
{
struct stv6110x_state *stv6110x = fe->tuner_priv;
stv6110x_read_reg(stv6110x, STV6110x_CTRL3, &stv6110x->regs[STV6110x_CTRL3]);
*bandwidth = (STV6110x_GETFIELD(CTRL3_CF, stv6110x->regs[STV6110x_CTRL3]) + 5) * 2000000;
return 0;
}
static int stv6110x_set_refclock(struct dvb_frontend *fe, u32 refclock)
{
struct stv6110x_state *stv6110x = fe->tuner_priv;
/* setup divider */
switch (refclock) {
default:
case 1:
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 0);
break;
case 2:
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 1);
break;
case 4:
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 2);
break;
case 8:
case 0:
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 3);
break;
}
stv6110x_write_reg(stv6110x, STV6110x_CTRL2, stv6110x->regs[STV6110x_CTRL2]);
return 0;
}
static int stv6110x_get_bbgain(struct dvb_frontend *fe, u32 *gain)
{
struct stv6110x_state *stv6110x = fe->tuner_priv;
stv6110x_read_reg(stv6110x, STV6110x_CTRL2, &stv6110x->regs[STV6110x_CTRL2]);
*gain = 2 * STV6110x_GETFIELD(CTRL2_BBGAIN, stv6110x->regs[STV6110x_CTRL2]);
return 0;
}
static int stv6110x_set_bbgain(struct dvb_frontend *fe, u32 gain)
{
struct stv6110x_state *stv6110x = fe->tuner_priv;
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_BBGAIN, gain / 2);
stv6110x_write_reg(stv6110x, STV6110x_CTRL2, stv6110x->regs[STV6110x_CTRL2]);
return 0;
}
static int stv6110x_set_mode(struct dvb_frontend *fe, enum tuner_mode mode)
{
struct stv6110x_state *stv6110x = fe->tuner_priv;
int ret;
switch (mode) {
case TUNER_SLEEP:
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_SYN, 0);
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_RX, 0);
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_LPT, 0);
break;
case TUNER_WAKE:
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_SYN, 1);
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_RX, 1);
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_LPT, 1);
break;
}
ret = stv6110x_write_reg(stv6110x, STV6110x_CTRL1, stv6110x->regs[STV6110x_CTRL1]);
if (ret < 0) {
dprintk(FE_ERROR, 1, "I/O Error");
return -EIO;
}
return 0;
}
static int stv6110x_sleep(struct dvb_frontend *fe)
{
if (fe->tuner_priv)
return stv6110x_set_mode(fe, TUNER_SLEEP);
return 0;
}
static int stv6110x_get_status(struct dvb_frontend *fe, u32 *status)
{
struct stv6110x_state *stv6110x = fe->tuner_priv;
stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);
if (STV6110x_GETFIELD(STAT1_LOCK, stv6110x->regs[STV6110x_STAT1]))
*status = TUNER_PHASELOCKED;
else
*status = 0;
return 0;
}
static void stv6110x_release(struct dvb_frontend *fe)
{
struct stv6110x_state *stv6110x = fe->tuner_priv;
fe->tuner_priv = NULL;
kfree(stv6110x);
}
static const struct dvb_tuner_ops stv6110x_ops = {
.info = {
.name = "STV6110(A) Silicon Tuner",
.frequency_min = 950000,
.frequency_max = 2150000,
.frequency_step = 0,
},
.release = stv6110x_release
};
static const struct stv6110x_devctl stv6110x_ctl = {
.tuner_init = stv6110x_init,
.tuner_sleep = stv6110x_sleep,
.tuner_set_mode = stv6110x_set_mode,
.tuner_set_frequency = stv6110x_set_frequency,
.tuner_get_frequency = stv6110x_get_frequency,
.tuner_set_bandwidth = stv6110x_set_bandwidth,
.tuner_get_bandwidth = stv6110x_get_bandwidth,
.tuner_set_bbgain = stv6110x_set_bbgain,
.tuner_get_bbgain = stv6110x_get_bbgain,
.tuner_set_refclk = stv6110x_set_refclock,
.tuner_get_status = stv6110x_get_status,
};
const struct stv6110x_devctl *stv6110x_attach(struct dvb_frontend *fe,
const struct stv6110x_config *config,
struct i2c_adapter *i2c)
{
struct stv6110x_state *stv6110x;
u8 default_regs[] = {0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e};
stv6110x = kzalloc(sizeof (struct stv6110x_state), GFP_KERNEL);
if (!stv6110x)
return NULL;
stv6110x->i2c = i2c;
stv6110x->config = config;
stv6110x->devctl = &stv6110x_ctl;
memcpy(stv6110x->regs, default_regs, 8);
/* setup divider */
switch (stv6110x->config->clk_div) {
default:
case 1:
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 0);
break;
case 2:
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 1);
break;
case 4:
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 2);
break;
case 8:
case 0:
STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 3);
break;
}
fe->tuner_priv = stv6110x;
fe->ops.tuner_ops = stv6110x_ops;
printk(KERN_INFO "%s: Attaching STV6110x\n", __func__);
return stv6110x->devctl;
}
EXPORT_SYMBOL(stv6110x_attach);
MODULE_AUTHOR("Manu Abraham");
MODULE_DESCRIPTION("STV6110x Silicon tuner");
MODULE_LICENSE("GPL");
Reference in New Issue View Git Blame Copy Permalink