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i2c: add API to do polling transfer

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There are instances where interrupts cannot be used for I2C transfer.
So add an API to do trasnfer in polling manner.

Change-Id: Ic030ef9469542aae9975aa7da55c578a2a6c5c93
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2015-09-29 11:22:23 -07:00 • committed by Anas Nashif
commit dea96a68b5
1 changed files with 30 additions and 0 deletions
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30
include/i2c.h
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@ -78,6 +78,7 @@ struct i2c_driver_api {
i2c_api_configure_t configure;
i2c_api_io_t read;
i2c_api_io_t write;
i2c_api_io_t polling_write;
i2c_api_suspend_t suspend;
i2c_api_resume_t resume;
};
@ -128,6 +129,35 @@ static inline int i2c_read(struct device *dev, uint8_t *buf,
return api->read(dev, buf, len, addr);
}
/**
* @brief Provide an interrupt free write as master
*
* This is for situation where transactions are guaranteed to finish
* before returning.
*
* Note that this is only for I2C device acting as master.
* Slave mode is currently not supported.
*
* @param dev Pointer to the device structure for the driver instance
* @param buf Memory pool that data should be transferred from
* @param len Size of the memory pool available for reading from
* @param addr Address of the I2C device to perform transfer
*
* @return DEV_OK if successful, otherwise failed.
*/
static inline int i2c_polling_write(struct device *dev, uint8_t *buf,
uint32_t len, uint16_t addr)
{
struct i2c_driver_api *api;
api = (struct i2c_driver_api *)dev->driver_api;
if (api && api->polling_write) {
return api->polling_write(dev, buf, len, addr);
} else {
return DEV_INVALID_OP;
}
}
/**
* @brief Suspend an I2C driver
* @param dev Pointer to the device structure for the driver instance