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i2c: i2c_mcux_flexcomm: add find target functions

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Add helper functions to find a free target for configuration and find a
target based on the configured slave address. These functions are in
preparation for multi-target mode.

Signed-off-by: Bram Vlerick <bram.vlerick@openpixelsystems.org>
This commit is contained in:
Bram Vlerick 2024-04-18 20:37:28 +02:00 committed by Fabio Baltieri
parent 39bae54b53
commit 20cc510df4
1 changed files with 41 additions and 6 deletions
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47
drivers/i2c/i2c_mcux_flexcomm.c
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@ -200,16 +200,49 @@ static int mcux_flexcomm_transfer(const struct device *dev,
} }
#if defined(CONFIG_I2C_TARGET) #if defined(CONFIG_I2C_TARGET)
static struct mcux_flexcomm_target_data *mcux_flexcomm_find_free_target(
struct mcux_flexcomm_data *data)
{
struct mcux_flexcomm_target_data *target = &data->target_data;
if (!target->target_attached) {
return target;
}
return NULL;
}
static struct mcux_flexcomm_target_data *mcux_flexcomm_find_target_by_address(
struct mcux_flexcomm_data *data, uint16_t address)
{
struct mcux_flexcomm_target_data *target = &data->target_data;
if (target->target_attached && target->target_cfg->address == address) {
return target;
}
return NULL;
}
static void i2c_target_transfer_callback(I2C_Type *base, static void i2c_target_transfer_callback(I2C_Type *base,
volatile i2c_slave_transfer_t *transfer, void *userData) volatile i2c_slave_transfer_t *transfer, void *userData)
{ {
/* Convert 8-bit received address to 7-bit address */
uint8_t address = transfer->receivedAddress >> 1;
struct mcux_flexcomm_data *data = userData; struct mcux_flexcomm_data *data = userData;
struct mcux_flexcomm_target_data *target = &data->target_data; struct mcux_flexcomm_target_data *target;
const struct i2c_target_callbacks *target_cb = target->target_cfg->callbacks; const struct i2c_target_callbacks *target_cb;
static uint8_t rxVal, txVal; static uint8_t rxVal, txVal;
ARG_UNUSED(base); ARG_UNUSED(base);
target = mcux_flexcomm_find_target_by_address(data, address);
if (!target) {
LOG_ERR("No target found for address: 0x%x", address);
return;
}
target_cb = target->target_cfg->callbacks;
switch (transfer->event) { switch (transfer->event) {
case kI2C_SlaveTransmitEvent: case kI2C_SlaveTransmitEvent:
/* request to provide data to transmit */ /* request to provide data to transmit */
@ -264,7 +297,7 @@ int mcux_flexcomm_target_register(const struct device *dev,
{ {
const struct mcux_flexcomm_config *config = dev->config; const struct mcux_flexcomm_config *config = dev->config;
struct mcux_flexcomm_data *data = dev->data; struct mcux_flexcomm_data *data = dev->data;
struct mcux_flexcomm_target_data *target = &data->target_data; struct mcux_flexcomm_target_data *target;
I2C_Type *base = config->base; I2C_Type *base = config->base;
uint32_t clock_freq; uint32_t clock_freq;
i2c_slave_config_t i2c_cfg; i2c_slave_config_t i2c_cfg;
@ -281,7 +314,8 @@ int mcux_flexcomm_target_register(const struct device *dev,
return -EINVAL; return -EINVAL;
} }
if (target->target_attached) { target = mcux_flexcomm_find_free_target(data);
if (!target) {
return -EBUSY; return -EBUSY;
} }
@ -309,10 +343,11 @@ int mcux_flexcomm_target_unregister(const struct device *dev,
{ {
const struct mcux_flexcomm_config *config = dev->config; const struct mcux_flexcomm_config *config = dev->config;
struct mcux_flexcomm_data *data = dev->data; struct mcux_flexcomm_data *data = dev->data;
struct mcux_flexcomm_target_data *target = &data->target_data; struct mcux_flexcomm_target_data *target;
I2C_Type *base = config->base; I2C_Type *base = config->base;
if (!target->target_attached) { target = mcux_flexcomm_find_target_by_address(data, target_config->address);
if (!target || !target->target_attached) {
return -EINVAL; return -EINVAL;
} }