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dm: i2c: Add a message debug function

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Add a way to dump the contents of an I2C message for debugging purposes.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Simon Glass
2015-07-02 18:15:39 -06:00
parent d82ba4c0b4
commit 7d7db2225c
2 changed files with 26 additions and 0 deletions
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16
drivers/i2c/i2c-uclass.c
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@ -18,6 +18,22 @@ DECLARE_GLOBAL_DATA_PTR;
#define I2C_MAX_OFFSET_LEN 4 #define I2C_MAX_OFFSET_LEN 4
/* Useful debugging function */
void i2c_dump_msgs(struct i2c_msg *msg, int nmsgs)
{
int i;
for (i = 0; i < nmsgs; i++) {
struct i2c_msg *m = &msg[i];
printf(" %s %x len=%x", m->flags & I2C_M_RD ? "R" : "W",
msg->addr, msg->len);
if (!(m->flags & I2C_M_RD))
printf(": %x", m->buf[0]);
printf("\n");
}
}
/** /**
* i2c_setup_offset() - Set up a new message with a chip offset * i2c_setup_offset() - Set up a new message with a chip offset
* *

10
include/i2c.h
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@ -473,6 +473,16 @@ int i2c_get_chip_for_busnum(int busnum, int chip_addr, uint offset_len,
int i2c_chip_ofdata_to_platdata(const void *blob, int node, int i2c_chip_ofdata_to_platdata(const void *blob, int node,
struct dm_i2c_chip *chip); struct dm_i2c_chip *chip);
/**
* i2c_dump_msgs() - Dump a list of I2C messages
*
* This may be useful for debugging.
*
* @msg: Message list to dump
* @nmsgs: Number of messages
*/
void i2c_dump_msgs(struct i2c_msg *msg, int nmsgs);
#ifndef CONFIG_DM_I2C #ifndef CONFIG_DM_I2C
/* /*