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Date: Sat, 1 Apr 2017 10:53:55 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Wolfram Sang <wsa@...-dreams.de>
Cc: Jean Delvare <jdelvare@...e.de>, linux-i2c@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: use void pointers for supplying data for reads and
writes
There is no need to force users of i2c_master_send()/i2c_master_recv()
and other i2c read/write bulk data API to cast everything into u* pointers.
While everything can be considered byte stream, the drivers are usually
work with more structured data.
Let's switch the APIs to accept [const] void pointers to cut amount of
casting needed.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
drivers/i2c/i2c-core.c | 23 ++++++++++++-----------
include/linux/i2c.h | 15 ++++++++-------
2 files changed, 20 insertions(+), 18 deletions(-)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 9ff5ce3d5fba..6efeba42d10b 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -56,6 +56,7 @@
#include <linux/property.h>
#include <linux/rwsem.h>
#include <linux/slab.h>
+#include <asm/unaligned.h>
#include "i2c-core.h"
@@ -2817,7 +2818,7 @@ EXPORT_SYMBOL(i2c_transfer);
*
* Returns negative errno, or else the number of bytes written.
*/
-int i2c_master_send(const struct i2c_client *client, const char *buf, int count)
+int i2c_master_send(const struct i2c_client *client, const void *buf, int count)
{
int ret;
struct i2c_adapter *adap = client->adapter;
@@ -2826,7 +2827,7 @@ int i2c_master_send(const struct i2c_client *client, const char *buf, int count)
msg.addr = client->addr;
msg.flags = client->flags & I2C_M_TEN;
msg.len = count;
- msg.buf = (char *)buf;
+ msg.buf = (u8 *)buf; /* cast away const */
ret = i2c_transfer(adap, &msg, 1);
@@ -2846,7 +2847,7 @@ EXPORT_SYMBOL(i2c_master_send);
*
* Returns negative errno, or else the number of bytes read.
*/
-int i2c_master_recv(const struct i2c_client *client, char *buf, int count)
+int i2c_master_recv(const struct i2c_client *client, void *buf, int count)
{
struct i2c_adapter *adap = client->adapter;
struct i2c_msg msg;
@@ -3290,7 +3291,7 @@ EXPORT_SYMBOL(i2c_smbus_write_word_data);
* mechanism (I2C_M_RECV_LEN) which may not be implemented.
*/
s32 i2c_smbus_read_block_data(const struct i2c_client *client, u8 command,
- u8 *values)
+ void *values)
{
union i2c_smbus_data data;
int status;
@@ -3317,7 +3318,7 @@ EXPORT_SYMBOL(i2c_smbus_read_block_data);
* else zero on success.
*/
s32 i2c_smbus_write_block_data(const struct i2c_client *client, u8 command,
- u8 length, const u8 *values)
+ u8 length, const void *values)
{
union i2c_smbus_data data;
@@ -3333,7 +3334,7 @@ EXPORT_SYMBOL(i2c_smbus_write_block_data);
/* Returns the number of read bytes */
s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client, u8 command,
- u8 length, u8 *values)
+ u8 length, void *values)
{
union i2c_smbus_data data;
int status;
@@ -3353,7 +3354,7 @@ s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client, u8 command,
EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data);
s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client, u8 command,
- u8 length, const u8 *values)
+ u8 length, const void *values)
{
union i2c_smbus_data data;
@@ -3633,7 +3634,8 @@ EXPORT_SYMBOL(i2c_smbus_xfer);
* transfer.
*/
s32 i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client,
- u8 command, u8 length, u8 *values)
+ u8 command, u8 length,
+ void *values)
{
u8 i = 0;
int status;
@@ -3652,8 +3654,7 @@ s32 i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client,
status = i2c_smbus_read_word_data(client, command + i);
if (status < 0)
return status;
- values[i] = status & 0xff;
- values[i + 1] = status >> 8;
+ put_unaligned_le16(status, values + i);
i += 2;
}
}
@@ -3662,7 +3663,7 @@ s32 i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client,
status = i2c_smbus_read_byte_data(client, command + i);
if (status < 0)
return status;
- values[i] = status;
+ *((u8 *)values + i) = status;
i++;
}
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index b4b6583d0e07..d9f9601fce4c 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -62,9 +62,9 @@ struct property_entry;
* transmit an arbitrary number of messages without interruption.
* @count must be be less than 64k since msg.len is u16.
*/
-extern int i2c_master_send(const struct i2c_client *client, const char *buf,
+extern int i2c_master_send(const struct i2c_client *client, const void *buf,
int count);
-extern int i2c_master_recv(const struct i2c_client *client, char *buf,
+extern int i2c_master_recv(const struct i2c_client *client, void *buf,
int count);
/* Transfer num messages.
@@ -115,18 +115,19 @@ i2c_smbus_write_word_swapped(const struct i2c_client *client,
/* Returns the number of read bytes */
extern s32 i2c_smbus_read_block_data(const struct i2c_client *client,
- u8 command, u8 *values);
+ u8 command, void *values);
extern s32 i2c_smbus_write_block_data(const struct i2c_client *client,
- u8 command, u8 length, const u8 *values);
+ u8 command, u8 length,
+ const void *values);
/* Returns the number of read bytes */
extern s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client,
- u8 command, u8 length, u8 *values);
+ u8 command, u8 length, void *values);
extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,
u8 command, u8 length,
- const u8 *values);
+ const void *values);
extern s32
i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client,
- u8 command, u8 length, u8 *values);
+ u8 command, u8 length, void *values);
#endif /* I2C */
enum i2c_alert_protocol {
--
2.12.2.564.g063fe858b8-goog
--
Dmitry
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