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hw/i2c: add match method for device search

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At the start of an i2c transaction, the i2c bus searches its list of
children to identify which devices correspond to the address (or
broadcast).  Now the I2CSlave device has a method "match" that
encapsulates the lookup behavior. This allows the behavior to be changed
to support devices, such as i2c muxes.

Tested: A BMC firmware was booted to userspace and i2c devices were
detected.

Signed-off-by: Patrick Venture <venture@google.com>
Reviewed-by: Hao Wu <wuhaotsh@google.com>
Message-Id: <20210412194522.664594-3-venture@google.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Patrick Venture 2021-04-12 12:45:20 -07:00 • committed by Corey Minyard
parent b98ec6896e
commit 513ca82d89
2 changed files with 30 additions and 4 deletions
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11
include/hw/i2c/i2c.h
View file

@ -16,6 +16,7 @@ enum i2c_event {
I2C_NACK /* Masker NACKed a receive byte. */
};
typedef struct I2CNodeList I2CNodeList;
#define TYPE_I2C_SLAVE "i2c-slave"
OBJECT_DECLARE_TYPE(I2CSlave, I2CSlaveClass,
@ -39,6 +40,16 @@ struct I2CSlaveClass {
* return code is not used and should be zero.
*/
int (*event)(I2CSlave *s, enum i2c_event event);
/*
* Check if this device matches the address provided. Returns bool of
* true if it matches (or broadcast), and updates the device list, false
* otherwise.
*
* If broadcast is true, match should add the device and return true.
*/
bool (*match_and_add)(I2CSlave *candidate, uint8_t address, bool broadcast,
I2CNodeList *current_devs);
};
struct I2CSlave {