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kernel: add i2c mangle hook

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This commit is contained in:
Jaroslav Kysela 2015-04-20 15:37:38 +02:00
parent e86bc1fc87
commit 98e0d6d0e2
2 changed files with 14 additions and 10 deletions
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22
kernel/drivers/i2c/i2c-core.c
View File

@ -1072,7 +1072,7 @@ module_exit(i2c_exit);
* Note that there is no requirement that each message be sent to
* the same slave address, although that is the most common model.
*/
int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
int i2c_transfer2(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
unsigned long orig_jiffies;
int ret, try;
@ -1103,15 +1103,6 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
(msgs[ret].flags & I2C_M_RECV_LEN) ? "+" : "");
}
#endif
#if 0
for (ret = 0; ret < num; ret++) {
printk("i2c master_xfer[%d] %c, addr=0x%02x, "
"len=%d%s, flags=0x%x\n", ret, (msgs[ret].flags & I2C_M_RD)
? 'R' : 'W', msgs[ret].addr, msgs[ret].len,
(msgs[ret].flags & I2C_M_RECV_LEN) ? "+" : "",
msgs[ret].flags);
}
#endif
if (in_atomic() || irqs_disabled()) {
ret = mutex_trylock(&adap->bus_lock);
@ -1139,6 +1130,17 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
return -EOPNOTSUPP;
}
}
EXPORT_SYMBOL(i2c_transfer2);
int (*i2c_transfer_mangle)(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
EXPORT_SYMBOL(i2c_transfer_mangle);
int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
if (i2c_transfer_mangle)
return i2c_transfer_mangle(adap, msgs, num);
return i2c_transfer2(adap, msgs, num);
}
EXPORT_SYMBOL(i2c_transfer);
/**

2
kernel/include/linux/i2c.h
View File

@ -60,6 +60,8 @@ extern int i2c_master_recv(struct i2c_client *client, char *buf, int count);
/* Transfer num messages.
*/
extern int (*i2c_transfer_mangle)
(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
int num);