enum i2c_mot_mode mot = (msg->request & DP_AUX_I2C_MOT) ?
I2C_MOT_TRUE : I2C_MOT_FALSE;
enum ddc_result res;
- ssize_t read_bytes;
+ uint32_t read_bytes = msg->size;
if (WARN_ON(msg->size > 16))
return -E2BIG;
switch (msg->request & ~DP_AUX_I2C_MOT) {
case DP_AUX_NATIVE_READ:
- read_bytes = dal_ddc_service_read_dpcd_data(
+ res = dal_ddc_service_read_dpcd_data(
TO_DM_AUX(aux)->ddc_service,
false,
I2C_MOT_UNDEF,
msg->address,
msg->buffer,
- msg->size);
- return read_bytes;
+ msg->size,
+ &read_bytes);
+ break;
case DP_AUX_NATIVE_WRITE:
res = dal_ddc_service_write_dpcd_data(
TO_DM_AUX(aux)->ddc_service,
msg->size);
break;
case DP_AUX_I2C_READ:
- read_bytes = dal_ddc_service_read_dpcd_data(
+ res = dal_ddc_service_read_dpcd_data(
TO_DM_AUX(aux)->ddc_service,
true,
mot,
msg->address,
msg->buffer,
- msg->size);
- return read_bytes;
+ msg->size,
+ &read_bytes);
+ break;
case DP_AUX_I2C_WRITE:
res = dal_ddc_service_write_dpcd_data(
TO_DM_AUX(aux)->ddc_service,
r == DDC_RESULT_SUCESSFULL);
#endif
- return msg->size;
+ if (res != DDC_RESULT_SUCESSFULL)
+ return -EIO;
+ return read_bytes;
}
static enum drm_connector_status
return ret;
}
-ssize_t dal_ddc_service_read_dpcd_data(
+enum ddc_result dal_ddc_service_read_dpcd_data(
struct ddc_service *ddc,
bool i2c,
enum i2c_mot_mode mot,
uint32_t address,
uint8_t *data,
- uint32_t len)
+ uint32_t len,
+ uint32_t *read)
{
struct aux_payload read_payload = {
.i2c_over_aux = i2c,
.mot = mot
};
+ *read = 0;
+
if (len > DEFAULT_AUX_MAX_DATA_SIZE) {
BREAK_TO_DEBUGGER();
return DDC_RESULT_FAILED_INVALID_OPERATION;
ddc->ctx->i2caux,
ddc->ddc_pin,
&command)) {
- return (ssize_t)command.payloads->length;
+ *read = command.payloads->length;
+ return DDC_RESULT_SUCESSFULL;
}
return DDC_RESULT_FAILED_OPERATION;