* [Qemu-devel] [RFC v1 1/1] i2c: Factor our send() and recv() common logic
@ 2015-10-19 4:09 Peter Crosthwaite
2015-11-02 9:09 ` Frederic Konrad
0 siblings, 1 reply; 3+ messages in thread
From: Peter Crosthwaite @ 2015-10-19 4:09 UTC (permalink / raw)
To: qemu-devel; +Cc: Peter Crosthwaite, fred.konrad
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>
---
hw/i2c/core.c | 34 +++++++++++++++++++---------------
include/hw/i2c/i2c.h | 1 +
2 files changed, 20 insertions(+), 15 deletions(-)
diff --git a/hw/i2c/core.c b/hw/i2c/core.c
index 5a64026..d4a8cbb 100644
--- a/hw/i2c/core.c
+++ b/hw/i2c/core.c
@@ -129,7 +129,7 @@ void i2c_end_transfer(I2CBus *bus)
bus->current_dev = NULL;
}
-int i2c_send(I2CBus *bus, uint8_t data)
+int i2c_send_recv(I2CBus *bus, uint8_t *data, bool send)
{
I2CSlave *dev = bus->current_dev;
I2CSlaveClass *sc;
@@ -139,28 +139,32 @@ int i2c_send(I2CBus *bus, uint8_t data)
}
sc = I2C_SLAVE_GET_CLASS(dev);
- if (sc->send) {
- return sc->send(dev, data);
+ if (send && sc->send) {
+ return sc->send(dev, *data);
+ } else if (!send && sc->recv) {
+ int ret = sc->recv(dev);
+ if (ret < 0) {
+ return ret;
+ } else {
+ *data = ret;
+ return 0;
+ }
}
return -1;
}
-int i2c_recv(I2CBus *bus)
+int i2c_send(I2CBus *bus, uint8_t data)
{
- I2CSlave *dev = bus->current_dev;
- I2CSlaveClass *sc;
-
- if (!dev) {
- return -1;
- }
+ return i2c_send_recv(bus, &data, true);
+}
- sc = I2C_SLAVE_GET_CLASS(dev);
- if (sc->recv) {
- return sc->recv(dev);
- }
+int i2c_recv(I2CBus *bus)
+{
+ uint8_t data;
+ int ret = i2c_send_recv(bus, &data, false);
- return -1;
+ return ret < 0 ? ret : data;
}
void i2c_nack(I2CBus *bus)
diff --git a/include/hw/i2c/i2c.h b/include/hw/i2c/i2c.h
index 4986ebc..c4085aa 100644
--- a/include/hw/i2c/i2c.h
+++ b/include/hw/i2c/i2c.h
@@ -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);
--
1.9.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [RFC v1 1/1] i2c: Factor our send() and recv() common logic
2015-10-19 4:09 [Qemu-devel] [RFC v1 1/1] i2c: Factor our send() and recv() common logic Peter Crosthwaite
@ 2015-11-02 9:09 ` Frederic Konrad
2016-01-28 15:04 ` Frederic Konrad
0 siblings, 1 reply; 3+ messages in thread
From: Frederic Konrad @ 2015-11-02 9:09 UTC (permalink / raw)
To: Peter Crosthwaite, qemu-devel; +Cc: Peter Crosthwaite
On 19/10/2015 06:09, Peter Crosthwaite wrote:
> 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>
> ---
>
> hw/i2c/core.c | 34 +++++++++++++++++++---------------
> include/hw/i2c/i2c.h | 1 +
> 2 files changed, 20 insertions(+), 15 deletions(-)
>
> diff --git a/hw/i2c/core.c b/hw/i2c/core.c
> index 5a64026..d4a8cbb 100644
> --- a/hw/i2c/core.c
> +++ b/hw/i2c/core.c
> @@ -129,7 +129,7 @@ void i2c_end_transfer(I2CBus *bus)
> bus->current_dev = NULL;
> }
>
> -int i2c_send(I2CBus *bus, uint8_t data)
> +int i2c_send_recv(I2CBus *bus, uint8_t *data, bool send)
Double space here between I2CBus and *bus.
Otherwise it looks ok for me.
Fred
> {
> I2CSlave *dev = bus->current_dev;
> I2CSlaveClass *sc;
> @@ -139,28 +139,32 @@ int i2c_send(I2CBus *bus, uint8_t data)
> }
>
> sc = I2C_SLAVE_GET_CLASS(dev);
> - if (sc->send) {
> - return sc->send(dev, data);
> + if (send && sc->send) {
> + return sc->send(dev, *data);
> + } else if (!send && sc->recv) {
> + int ret = sc->recv(dev);
> + if (ret < 0) {
> + return ret;
> + } else {
> + *data = ret;
> + return 0;
> + }
> }
>
> return -1;
> }
>
> -int i2c_recv(I2CBus *bus)
> +int i2c_send(I2CBus *bus, uint8_t data)
> {
> - I2CSlave *dev = bus->current_dev;
> - I2CSlaveClass *sc;
> -
> - if (!dev) {
> - return -1;
> - }
> + return i2c_send_recv(bus, &data, true);
> +}
>
> - sc = I2C_SLAVE_GET_CLASS(dev);
> - if (sc->recv) {
> - return sc->recv(dev);
> - }
> +int i2c_recv(I2CBus *bus)
> +{
> + uint8_t data;
> + int ret = i2c_send_recv(bus, &data, false);
>
> - return -1;
> + return ret < 0 ? ret : data;
> }
>
> void i2c_nack(I2CBus *bus)
> diff --git a/include/hw/i2c/i2c.h b/include/hw/i2c/i2c.h
> index 4986ebc..c4085aa 100644
> --- a/include/hw/i2c/i2c.h
> +++ b/include/hw/i2c/i2c.h
> @@ -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);
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [RFC v1 1/1] i2c: Factor our send() and recv() common logic
2015-11-02 9:09 ` Frederic Konrad
@ 2016-01-28 15:04 ` Frederic Konrad
0 siblings, 0 replies; 3+ messages in thread
From: Frederic Konrad @ 2016-01-28 15:04 UTC (permalink / raw)
To: Peter Crosthwaite, qemu-devel
On 02/11/2015 10:09, Frederic Konrad wrote:
> On 19/10/2015 06:09, Peter Crosthwaite wrote:
>> 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>
>> ---
>>
>> hw/i2c/core.c | 34 +++++++++++++++++++---------------
>> include/hw/i2c/i2c.h | 1 +
>> 2 files changed, 20 insertions(+), 15 deletions(-)
>>
>> diff --git a/hw/i2c/core.c b/hw/i2c/core.c
>> index 5a64026..d4a8cbb 100644
>> --- a/hw/i2c/core.c
>> +++ b/hw/i2c/core.c
>> @@ -129,7 +129,7 @@ void i2c_end_transfer(I2CBus *bus)
>> bus->current_dev = NULL;
>> }
>>
>> -int i2c_send(I2CBus *bus, uint8_t data)
>> +int i2c_send_recv(I2CBus *bus, uint8_t *data, bool send)
> Double space here between I2CBus and *bus.
>
> Otherwise it looks ok for me.
Is everybody ok with this patch?
If it's the case I can pick it with the dpdma series.
Thanks,
Fred
> Fred
>> {
>> I2CSlave *dev = bus->current_dev;
>> I2CSlaveClass *sc;
>> @@ -139,28 +139,32 @@ int i2c_send(I2CBus *bus, uint8_t data)
>> }
>>
>> sc = I2C_SLAVE_GET_CLASS(dev);
>> - if (sc->send) {
>> - return sc->send(dev, data);
>> + if (send && sc->send) {
>> + return sc->send(dev, *data);
>> + } else if (!send && sc->recv) {
>> + int ret = sc->recv(dev);
>> + if (ret < 0) {
>> + return ret;
>> + } else {
>> + *data = ret;
>> + return 0;
>> + }
>> }
>>
>> return -1;
>> }
>>
>> -int i2c_recv(I2CBus *bus)
>> +int i2c_send(I2CBus *bus, uint8_t data)
>> {
>> - I2CSlave *dev = bus->current_dev;
>> - I2CSlaveClass *sc;
>> -
>> - if (!dev) {
>> - return -1;
>> - }
>> + return i2c_send_recv(bus, &data, true);
>> +}
>>
>> - sc = I2C_SLAVE_GET_CLASS(dev);
>> - if (sc->recv) {
>> - return sc->recv(dev);
>> - }
>> +int i2c_recv(I2CBus *bus)
>> +{
>> + uint8_t data;
>> + int ret = i2c_send_recv(bus, &data, false);
>>
>> - return -1;
>> + return ret < 0 ? ret : data;
>> }
>>
>> void i2c_nack(I2CBus *bus)
>> diff --git a/include/hw/i2c/i2c.h b/include/hw/i2c/i2c.h
>> index 4986ebc..c4085aa 100644
>> --- a/include/hw/i2c/i2c.h
>> +++ b/include/hw/i2c/i2c.h
>> @@ -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);
>>
>
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2015-10-19 4:09 [Qemu-devel] [RFC v1 1/1] i2c: Factor our send() and recv() common logic Peter Crosthwaite
2015-11-02 9:09 ` Frederic Konrad
2016-01-28 15:04 ` Frederic Konrad
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