Properly propagate error codes.
---
lib/smbus.c | 106 +++++++++++++++++++++++++++++++++++------------------------
1 file changed, 63 insertions(+), 43 deletions(-)
--- i2c-tools.orig/lib/smbus.c 2012-06-22 16:10:22.000000000 +0200
+++ i2c-tools/lib/smbus.c 2012-06-22 16:17:57.534645602 +0200
@@ -3,6 +3,7 @@
Copyright (C) 1995-97 Simon G. Vogl
Copyright (C) 1998-99 Frodo Looijaard <[email protected]>
+ Copyright (C) 2012 Jean Delvare <[email protected]>
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
@@ -20,6 +21,7 @@
MA 02110-1301 USA.
*/
+#include <errno.h>
#include <i2c/smbus.h>
#include <sys/ioctl.h>
#include <linux/types.h>
@@ -38,12 +40,17 @@ __s32 i2c_smbus_access(int file, char re
int size, union i2c_smbus_data *data)
{
struct i2c_smbus_ioctl_data args;
+ __s32 err;
args.read_write = read_write;
args.command = command;
args.size = size;
args.data = data;
- return ioctl(file, I2C_SMBUS, &args);
+
+ err = ioctl(file, I2C_SMBUS, &args);
+ if (err == -1)
+ err = -errno;
+ return err;
}
@@ -55,10 +62,13 @@ __s32 i2c_smbus_write_quick(int file, __
__s32 i2c_smbus_read_byte(int file)
{
union i2c_smbus_data data;
- if (i2c_smbus_access(file, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data))
- return -1;
- else
- return 0x0FF & data.byte;
+ int err;
+
+ err = i2c_smbus_access(file, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data);
+ if (err < 0)
+ return err;
+
+ return 0x0FF & data.byte;
}
__s32 i2c_smbus_write_byte(int file, __u8 value)
@@ -70,11 +80,14 @@ __s32 i2c_smbus_write_byte(int file, __u
__s32 i2c_smbus_read_byte_data(int file, __u8 command)
{
union i2c_smbus_data data;
- if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
- I2C_SMBUS_BYTE_DATA, &data))
- return -1;
- else
- return 0x0FF & data.byte;
+ int err;
+
+ err = i2c_smbus_access(file, I2C_SMBUS_READ, command,
+ I2C_SMBUS_BYTE_DATA, &data);
+ if (err < 0)
+ return err;
+
+ return 0x0FF & data.byte;
}
__s32 i2c_smbus_write_byte_data(int file, __u8 command, __u8 value)
@@ -88,11 +101,14 @@ __s32 i2c_smbus_write_byte_data(int file
__s32 i2c_smbus_read_word_data(int file, __u8 command)
{
union i2c_smbus_data data;
- if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
- I2C_SMBUS_WORD_DATA, &data))
- return -1;
- else
- return 0x0FFFF & data.word;
+ int err;
+
+ err = i2c_smbus_access(file, I2C_SMBUS_READ, command,
+ I2C_SMBUS_WORD_DATA, &data);
+ if (err < 0)
+ return err;
+
+ return 0x0FFFF & data.word;
}
__s32 i2c_smbus_write_word_data(int file, __u8 command, __u16 value)
@@ -118,15 +134,16 @@ __s32 i2c_smbus_process_call(int file, _
__s32 i2c_smbus_read_block_data(int file, __u8 command, __u8 *values)
{
union i2c_smbus_data data;
- int i;
- if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
- I2C_SMBUS_BLOCK_DATA, &data))
- return -1;
- else {
- for (i = 1; i <= data.block[0]; i++)
- values[i-1] = data.block[i];
- return data.block[0];
- }
+ int i, err;
+
+ err = i2c_smbus_access(file, I2C_SMBUS_READ, command,
+ I2C_SMBUS_BLOCK_DATA, &data);
+ if (err < 0)
+ return err;
+
+ for (i = 1; i <= data.block[0]; i++)
+ values[i-1] = data.block[i];
+ return data.block[0];
}
__s32 i2c_smbus_write_block_data(int file, __u8 command, __u8 length,
@@ -151,20 +168,21 @@ __s32 i2c_smbus_read_i2c_block_data(int
__u8 *values)
{
union i2c_smbus_data data;
- int i;
+ int i, err;
if (length > 32)
length = 32;
data.block[0] = length;
- if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
- length == 32 ? I2C_SMBUS_I2C_BLOCK_BROKEN :
- I2C_SMBUS_I2C_BLOCK_DATA, &data))
- return -1;
- else {
- for (i = 1; i <= data.block[0]; i++)
- values[i-1] = data.block[i];
- return data.block[0];
- }
+
+ err = i2c_smbus_access(file, I2C_SMBUS_READ, command,
+ length == 32 ? I2C_SMBUS_I2C_BLOCK_BROKEN :
+ I2C_SMBUS_I2C_BLOCK_DATA, &data);
+ if (err < 0)
+ return err;
+
+ for (i = 1; i <= data.block[0]; i++)
+ values[i-1] = data.block[i];
+ return data.block[0];
}
__s32 i2c_smbus_write_i2c_block_data(int file, __u8 command, __u8 length,
@@ -186,18 +204,20 @@ __s32 i2c_smbus_block_process_call(int f
__u8 *values)
{
union i2c_smbus_data data;
- int i;
+ int i, err;
+
if (length > 32)
length = 32;
for (i = 1; i <= length; i++)
data.block[i] = values[i-1];
data.block[0] = length;
- if (i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
- I2C_SMBUS_BLOCK_PROC_CALL, &data))
- return -1;
- else {
- for (i = 1; i <= data.block[0]; i++)
- values[i-1] = data.block[i];
- return data.block[0];
- }
+
+ err = i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
+ I2C_SMBUS_BLOCK_PROC_CALL, &data);
+ if (err < 0)
+ return err;
+
+ for (i = 1; i <= data.block[0]; i++)
+ values[i-1] = data.block[i];
+ return data.block[0];
}
--
Jean Delvare
--
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