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i2c: mcux transfer with callbacks

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Implements i2c_transfer_cb for the mcux driver

Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
This commit is contained in:
Tom Burdick 2022-05-02 12:56:22 -05:00 committed by Anas Nashif
parent a45ece6984
commit 006d9ffceb
1 changed files with 129 additions and 3 deletions
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132
drivers/i2c/i2c_mcux.c
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@ -36,6 +36,14 @@ struct i2c_mcux_data {
struct k_sem lock;
struct k_sem device_sync_sem;
status_t callback_status;
#ifdef CONFIG_I2C_CALLBACK
uint16_t addr;
uint32_t msg;
struct i2c_msg *msgs;
uint32_t num_msgs;
i2c_callback_t cb;
void *userdata;
#endif /* CONFIG_I2C_CALLBACK */
};
static int i2c_mcux_configure(const struct device *dev,
@ -77,16 +85,42 @@ static int i2c_mcux_configure(const struct device *dev,
return 0;
}
#ifdef CONFIG_I2C_CALLBACK
static void i2c_mcux_async_done(const struct device *dev, struct i2c_mcux_data *data, int result);
static void i2c_mcux_async_iter(const struct device *dev);
#endif
static void i2c_mcux_master_transfer_callback(I2C_Type *base,
i2c_master_handle_t *handle,
status_t status, void *userData)
status_t status, void *userdata)
{
struct i2c_mcux_data *data = userData;
ARG_UNUSED(handle);
ARG_UNUSED(base);
struct device *dev = userdata;
struct i2c_mcux_data *data = dev->data;
#ifdef CONFIG_I2C_CALLBACK
if (data->cb != NULL) {
/* Async transfer */
if (status != kStatus_Success) {
I2C_MasterTransferAbort(base, &data->handle);
i2c_mcux_async_done(dev, data, -EIO);
} else if (data->msg == data->num_msgs - 1) {
i2c_mcux_async_done(dev, data, 0);
} else {
data->msg++;
i2c_mcux_async_iter(dev);
}
return;
}
#endif /* CONFIG_I2C_CALLBACK */
data->callback_status = status;
k_sem_give(&data->device_sync_sem);
}
@ -174,6 +208,95 @@ static int i2c_mcux_transfer(const struct device *dev, struct i2c_msg *msgs,
return ret;
}
#ifdef CONFIG_I2C_CALLBACK
static void i2c_mcux_async_done(const struct device *dev, struct i2c_mcux_data *data, int result)
{
i2c_callback_t cb = data->cb;
void *userdata = data->userdata;
data->msg = 0;
data->msgs = NULL;
data->num_msgs = 0;
data->cb = NULL;
data->userdata = NULL;
data->addr = 0;
k_sem_give(&data->lock);
/* Callback may wish to start another transfer */
cb(dev, result, userdata);
}
/* Start a transfer asynchronously */
static void i2c_mcux_async_iter(const struct device *dev)
{
I2C_Type *base = DEV_BASE(dev);
struct i2c_mcux_data *data = dev->data;
i2c_master_transfer_t transfer;
status_t status;
struct i2c_msg *msg = &data->msgs[data->msg];
if (I2C_MSG_ADDR_10_BITS & msg->flags) {
i2c_mcux_async_done(dev, data, -ENOTSUP);
return;
}
/* Initialize the transfer descriptor */
transfer.flags = i2c_mcux_convert_flags(msg->flags);
transfer.slaveAddress = data->addr;
transfer.direction = (msg->flags & I2C_MSG_READ) ? kI2C_Read : kI2C_Write;
transfer.subaddress = 0;
transfer.subaddressSize = 0;
transfer.data = msg->buf;
transfer.dataSize = msg->len;
/* Prevent the controller to send a start condition between
* messages, except if explicitly requested.
*/
if (data->msg != 0 && !(msg->flags & I2C_MSG_RESTART)) {
transfer.flags |= kI2C_TransferNoStartFlag;
}
/* Start the transfer */
status = I2C_MasterTransferNonBlocking(base, &data->handle, &transfer);
/* Return an error if the transfer didn't start successfully
* e.g., if the bus was busy
*/
if (status != kStatus_Success) {
I2C_MasterTransferAbort(base, &data->handle);
i2c_mcux_async_done(dev, data, -EIO);
}
}
static int i2c_mcux_transfer_cb(const struct device *dev, struct i2c_msg *msgs, uint8_t num_msgs,
uint16_t addr, i2c_callback_t cb, void *userdata)
{
struct i2c_mcux_data *data = dev->data;
int res = k_sem_take(&data->lock, K_NO_WAIT);
if (res != 0) {
return -EWOULDBLOCK;
}
data->msg = 0;
data->msgs = msgs;
data->num_msgs = num_msgs;
data->addr = addr;
data->cb = cb;
data->userdata = userdata;
data->addr = addr;
i2c_mcux_async_iter(dev);
return 0;
}
#endif /* CONFIG_I2C_CALLBACK */
static void i2c_mcux_isr(const struct device *dev)
{
I2C_Type *base = DEV_BASE(dev);
@ -198,7 +321,7 @@ static int i2c_mcux_init(const struct device *dev)
I2C_MasterGetDefaultConfig(&master_config);
I2C_MasterInit(base, &master_config, clock_freq);
I2C_MasterTransferCreateHandle(base, &data->handle,
i2c_mcux_master_transfer_callback, data);
i2c_mcux_master_transfer_callback, (void *)dev);
bitrate_cfg = i2c_map_dt_bitrate(config->bitrate);
@ -220,6 +343,9 @@ static int i2c_mcux_init(const struct device *dev)
static const struct i2c_driver_api i2c_mcux_driver_api = {
.configure = i2c_mcux_configure,
.transfer = i2c_mcux_transfer,
#ifdef CONFIG_I2C_CALLBACK
.transfer_cb = i2c_mcux_transfer_cb,
#endif
};
#define I2C_DEVICE_INIT_MCUX(n) \