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i2c: Factor our send() and recv() common logic 

Most of the control flow logic between send and recv (error checking
etc) is the same. Factor this out into a common send_recv() API.
This is then usable by clients, where the control logic for send
and receive differs only by a boolean. E.g.

if (send)
   i2c_send(...):
else
   i2c_recv(...);

becomes:

i2c_send_recv(... , send);

Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Message-id: 1465833014-21982-4-git-send-email-fred.konrad@greensocs.com
Changes from FK:
  * Rebased on master.
  * Rebased on my i2c broadcast patch.
Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Crosthwaite 2016-06-14 15:59:14 +01:00 committed by Peter Maydell
parent 2293c27fad
commit 056fca7b51
2 changed files with 35 additions and 18 deletions
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52
hw/i2c/core.c
View File

@ -149,36 +149,52 @@ void i2c_end_transfer(I2CBus *bus)
bus->broadcast = false;
}
int i2c_send(I2CBus *bus, uint8_t data)
int i2c_send_recv(I2CBus *bus, uint8_t *data, bool send)
{
I2CSlaveClass *sc;
I2CNode *node;
int ret = 0;
QLIST_FOREACH(node, &bus->current_devs, next) {
sc = I2C_SLAVE_GET_CLASS(node->elt);
if (sc->send) {
ret = ret || sc->send(node->elt, data);
} else {
ret = -1;
if (send) {
QLIST_FOREACH(node, &bus->current_devs, next) {
sc = I2C_SLAVE_GET_CLASS(node->elt);
if (sc->send) {
ret = ret || sc->send(node->elt, *data);
} else {
ret = -1;
}
}
return ret ? -1 : 0;
} else {
if ((QLIST_EMPTY(&bus->current_devs)) || (bus->broadcast)) {
return -1;
}
sc = I2C_SLAVE_GET_CLASS(QLIST_FIRST(&bus->current_devs)->elt);
if (sc->recv) {
ret = sc->recv(QLIST_FIRST(&bus->current_devs)->elt);
if (ret < 0) {
return ret;
} else {
*data = ret;
return 0;
}
}
return -1;
}
return ret ? -1 : 0;
}
int i2c_send(I2CBus *bus, uint8_t data)
{
return i2c_send_recv(bus, &data, true);
}
int i2c_recv(I2CBus *bus)
{
I2CSlaveClass *sc;
uint8_t data;
int ret = i2c_send_recv(bus, &data, false);
if ((QLIST_EMPTY(&bus->current_devs)) || (bus->broadcast)) {
return -1;
}
sc = I2C_SLAVE_GET_CLASS(QLIST_FIRST(&bus->current_devs)->elt);
if (sc->recv) {
return sc->recv(QLIST_FIRST(&bus->current_devs)->elt);
}
return -1;
return ret < 0 ? ret : data;
}
void i2c_nack(I2CBus *bus)

1
include/hw/i2c/i2c.h
View File

@ -56,6 +56,7 @@ int i2c_bus_busy(I2CBus *bus);
int i2c_start_transfer(I2CBus *bus, uint8_t address, int recv);
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);