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i2c: have I2C receive operation return uint8_t

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It is never supposed to fail and cannot return an error, so just
have it return the proper type.  Have it return 0xff on nothing
available, since that's what would happen on a real bus.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
Corey Minyard 2018-11-14 11:50:50 -06:00
parent 93198b6cad
commit 2ac4c5f4d2
19 changed files with 37 additions and 44 deletions
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7
include/hw/i2c/i2c.h
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@ -33,10 +33,9 @@ typedef struct I2CSlaveClass {
/*
* Slave to master. This cannot fail, the device should always
* return something here. Negative values probably result in 0xff
* and a possible log from the driver, and shouldn't be used.
* return something here.
*/
int (*recv)(I2CSlave *s);
uint8_t (*recv)(I2CSlave *s);
/*
* Notify the slave of a bus state change. For start event,
@ -78,7 +77,7 @@ void i2c_end_transfer(I2CBus *bus);
void i2c_nack(I2CBus *bus);
int i2c_send_recv(I2CBus *bus, uint8_t *data, bool send);
int i2c_send(I2CBus *bus, uint8_t data);
int i2c_recv(I2CBus *bus);
uint8_t i2c_recv(I2CBus *bus);
DeviceState *i2c_create_slave(I2CBus *bus, const char *name, uint8_t addr);