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i2c: Add a callback to the generic API

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Thus the caller will be noticed once its read and/or write calls have
gone through.
Taking the opportunity to fix the documentation about return code.

Change-Id: Id3f588fab978cad4393583f26509a9e91dcc8be2
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
This commit is contained in:
Tomasz Bursztyka 2015-10-01 14:16:47 -07:00 • committed by Anas Nashif
commit d3d14846cc
1 changed files with 26 additions and 0 deletions
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26
include/i2c.h
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@ -64,9 +64,19 @@ union dev_config {
} bits;
};
enum i2c_cb_type {
I2C_CB_WRITE = 1,
I2C_CB_READ = 2,
I2C_CB_ERROR = 3,
};
typedef void (*i2c_callback)(struct device *dev,
uint32_t cb_type);
typedef int (*i2c_api_configure_t)(struct device *dev,
uint32_t dev_config);
typedef int (*i2c_api_set_callback_t)(struct device *dev,
i2c_callback cb);
typedef int (*i2c_api_io_t)(struct device *dev,
uint8_t *buf,
uint32_t len,
@ -76,6 +86,7 @@ typedef int (*i2c_api_resume_t)(struct device *dev);
struct i2c_driver_api {
i2c_api_configure_t configure;
i2c_api_set_callback_t set_callback;
i2c_api_io_t read;
i2c_api_io_t write;
i2c_api_io_t polling_write;
@ -99,6 +110,21 @@ static inline int i2c_configure(struct device *dev, uint32_t dev_config)
return api->configure(dev, dev_config);
}
/**
* @brief Set an application callback
* @param dev Pointer to the device structure for the driver instance
* @param cb A valid pointer to a callback, or NULL
*
* @return DEV_OK if successful, another DEV_* code otherwise.
*/
static inline int i2c_set_callback(struct device *dev, i2c_callback cb)
{
struct i2c_driver_api *api;
api = (struct i2c_driver_api *)dev->driver_api;
return api->set_callback(dev, cb);
}
/**
* @brief Configure a host controllers operation
* @param dev Pointer to the device structure for the driver instance