mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 00:21:06 +00:00
310ae37edb
In the "Getting Started with Coccinelle - KVM edition" presentation that has been held by Julia Lawall at the KVM forum 2015 (see the slides at http://events.linuxfoundation.org/sites/events/files/slides/tutorial_kvm_0.pdf), she pointed out some bad return value checks in U-Boot that can be detected with Coccinelle by using the following config file: @@ identifier x,y; identifier f; statement S; @@ x = f(...); ( if (x < 0) S | if ( - y + x < 0) S ) This patch now fixes these issues. Signed-off-by: Thomas Huth <huth@tuxfamily.org>
111 lines
2.2 KiB
C
111 lines
2.2 KiB
C
/*
|
|
* (C) Copyright 2006
|
|
* Heiko Schocher, DENX Software Enginnering <hs@denx.de>
|
|
*
|
|
* based on dtt/lm75.c which is ...
|
|
*
|
|
* (C) Copyright 2001
|
|
* Bill Hunter, Wave 7 Optics, williamhunter@mediaone.net
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
/*
|
|
* On Semiconductor's LM81 Temperature Sensor
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <i2c.h>
|
|
#include <dtt.h>
|
|
|
|
/*
|
|
* Device code
|
|
*/
|
|
#define DTT_I2C_DEV_CODE 0x2c /* ON Semi's LM81 device */
|
|
#define DTT_READ_TEMP 0x27
|
|
#define DTT_CONFIG_TEMP 0x4b
|
|
#define DTT_TEMP_MAX 0x39
|
|
#define DTT_TEMP_HYST 0x3a
|
|
#define DTT_CONFIG 0x40
|
|
|
|
int dtt_read(int sensor, int reg)
|
|
{
|
|
int dlen = 1;
|
|
uchar data[2];
|
|
|
|
/*
|
|
* Calculate sensor address and register.
|
|
*/
|
|
sensor = DTT_I2C_DEV_CODE + (sensor & 0x03); /* calculate address of lm81 */
|
|
|
|
/*
|
|
* Now try to read the register.
|
|
*/
|
|
if (i2c_read(sensor, reg, 1, data, dlen) != 0)
|
|
return -1;
|
|
|
|
return (int)data[0];
|
|
} /* dtt_read() */
|
|
|
|
|
|
int dtt_write(int sensor, int reg, int val)
|
|
{
|
|
uchar data;
|
|
|
|
/*
|
|
* Calculate sensor address and register.
|
|
*/
|
|
sensor = DTT_I2C_DEV_CODE + (sensor & 0x03); /* calculate address of lm81 */
|
|
|
|
data = (char)(val & 0xff);
|
|
|
|
/*
|
|
* Write value to register.
|
|
*/
|
|
if (i2c_write(sensor, reg, 1, &data, 1) != 0)
|
|
return 1;
|
|
|
|
return 0;
|
|
} /* dtt_write() */
|
|
|
|
#define DTT_MANU 0x3e
|
|
#define DTT_REV 0x3f
|
|
#define DTT_CONFIG 0x40
|
|
#define DTT_ADR 0x48
|
|
|
|
int dtt_init_one(int sensor)
|
|
{
|
|
int man;
|
|
int adr;
|
|
int rev;
|
|
|
|
if (dtt_write (sensor, DTT_CONFIG, 0x01) < 0)
|
|
return 1;
|
|
/* The LM81 needs 400ms to get the correct values ... */
|
|
udelay (400000);
|
|
man = dtt_read (sensor, DTT_MANU);
|
|
if (man != 0x01)
|
|
return 1;
|
|
adr = dtt_read (sensor, DTT_ADR);
|
|
if (adr < 0)
|
|
return 1;
|
|
rev = dtt_read (sensor, DTT_REV);
|
|
if (rev < 0)
|
|
return 1;
|
|
|
|
debug ("DTT: Found LM81@%x Rev: %d\n", adr, rev);
|
|
return 0;
|
|
} /* dtt_init_one() */
|
|
|
|
|
|
#define TEMP_FROM_REG(temp) \
|
|
((temp)<256?((((temp)&0x1fe) >> 1) * 10) + ((temp) & 1) * 5: \
|
|
((((temp)&0x1fe) >> 1) -255) * 10 - ((temp) & 1) * 5) \
|
|
|
|
int dtt_get_temp(int sensor)
|
|
{
|
|
int val = dtt_read (sensor, DTT_READ_TEMP);
|
|
int tmpcnf = dtt_read (sensor, DTT_CONFIG_TEMP);
|
|
|
|
return (TEMP_FROM_REG((val << 1) + ((tmpcnf & 0x80) >> 7))) / 10;
|
|
} /* dtt_get_temp() */
|