October 2017
Intermediate to advanced
586 pages
14h 8m
English
Content preview from Linux Device Drivers Development
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Per-device data
The I2C core offers you the possibility to store a pointer to any data structure of your choice as device-specific data. To store or retrieve data, use the following function provided by the I2C core:
/* set the data */ void i2c_set_clientdata(struct i2c_client *client, void *data); /* get the data */ void *i2c_get_clientdata(const struct i2c_client *client);
These functions internally call dev_set_drvdata and dev_get_drvdata to update or get the value of the void *driver_data field of the struct device substructure in the struct i2c_client structure.
This is an example of how to use extra client data, an excerpt from drivers/gpio/gpio-mc9s08dz60.c:
/* This is the device specific data structure */ struct mc9s08dz60 { struct ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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