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dm: i2c: Add a function to transfer messages

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Sometimes it is useful to be able to transfer a raw I2C message. This
happens when the chip address needs to be set manually, or when the data to
be sent/received is in another buffer.

Add a function to provide access to this.

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 18:15:42 -06:00
parent 7fc65bcf8a
commit df358c6bec
2 changed files with 24 additions and 0 deletions
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11
drivers/i2c/i2c-uclass.c
View file

@ -202,6 +202,17 @@ int dm_i2c_write(struct udevice *dev, uint offset, const uint8_t *buffer,
} }
} }
int dm_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs)
{
struct udevice *bus = dev_get_parent(dev);
struct dm_i2c_ops *ops = i2c_get_ops(bus);
if (!ops->xfer)
return -ENOSYS;
return ops->xfer(bus, msg, nmsgs);
}
int dm_i2c_reg_read(struct udevice *dev, uint offset) int dm_i2c_reg_read(struct udevice *dev, uint offset)
{ {
uint8_t val; uint8_t val;

13
include/i2c.h
View file

@ -190,6 +190,19 @@ int dm_i2c_reg_read(struct udevice *dev, uint offset);
*/ */
int dm_i2c_reg_write(struct udevice *dev, uint offset, unsigned int val); int dm_i2c_reg_write(struct udevice *dev, uint offset, unsigned int val);
/**
* dm_i2c_xfer() - Transfer messages over I2C
*
* This transfers a raw message. It is best to use dm_i2c_reg_read/write()
* instead.
*
* @dev: Device to use for transfer
* @msg: List of messages to transfer
* @nmsgs: Number of messages to transfer
* @return 0 on success, -ve on error
*/
int dm_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs);
/** /**
* dm_i2c_set_bus_speed() - set the speed of a bus * dm_i2c_set_bus_speed() - set the speed of a bus
* *