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i2c: core changes for slave support

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Finally(!), make Linux support being an I2C slave. Most of the existing
infrastructure is reused. We mainly add i2c_slave_register/unregister()
calls which tells i2c bus drivers to activate the slave mode. Then, they
also get a callback to report slave events to.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2014-11-18 17:04:53 +01:00 • committed by Wolfram Sang
parent 40ed1b4caf
commit 4b1acc4333
2 changed files with 78 additions and 0 deletions
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29
include/linux/i2c.h
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@ -46,6 +46,8 @@ struct i2c_client;
struct i2c_driver;
union i2c_smbus_data;
struct i2c_board_info;
enum i2c_slave_event;
typedef int (*i2c_slave_cb_t)(struct i2c_client *, enum i2c_slave_event, u8 *);
struct module;
@ -209,6 +211,8 @@ struct i2c_driver {
* @irq: indicates the IRQ generated by this device (if any)
* @detected: member of an i2c_driver.clients list or i2c-core's
* userspace_devices list
* @slave_cb: Callback when I2C slave mode of an adapter is used. The adapter
* calls it to pass on slave events to the slave driver.
*
* An i2c_client identifies a single device (i.e. chip) connected to an
* i2c bus. The behaviour exposed to Linux is defined by the driver
@ -224,6 +228,7 @@ struct i2c_client {
struct device dev; /* the device structure */
int irq; /* irq issued by device */
struct list_head detected;
i2c_slave_cb_t slave_cb; /* callback for slave mode */
};
#define to_i2c_client(d) container_of(d, struct i2c_client, dev)
@ -246,6 +251,25 @@ static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
dev_set_drvdata(&dev->dev, data);
}
/* I2C slave support */
enum i2c_slave_event {
I2C_SLAVE_REQ_READ_START,
I2C_SLAVE_REQ_READ_END,
I2C_SLAVE_REQ_WRITE_START,
I2C_SLAVE_REQ_WRITE_END,
I2C_SLAVE_STOP,
};
extern int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb);
extern int i2c_slave_unregister(struct i2c_client *client);
static inline int i2c_slave_event(struct i2c_client *client,
enum i2c_slave_event event, u8 *val)
{
return client->slave_cb(client, event, val);
}
/**
* struct i2c_board_info - template for device creation
* @type: chip type, to initialize i2c_client.name
@ -352,6 +376,8 @@ i2c_register_board_info(int busnum, struct i2c_board_info const *info,
* into I2C transfers instead.
* @functionality: Return the flags that this algorithm/adapter pair supports
* from the I2C_FUNC_* flags.
* @reg_slave: Register given client to I2C slave mode of this adapter
* @unreg_slave: Unregister given client from I2C slave mode of this adapter
*
* The following structs are for those who like to implement new bus drivers:
* i2c_algorithm is the interface to a class of hardware solutions which can
@ -377,6 +403,9 @@ struct i2c_algorithm {
/* To determine what the adapter supports */
u32 (*functionality) (struct i2c_adapter *);
int (*reg_slave)(struct i2c_client *client);
int (*unreg_slave)(struct i2c_client *client);
};
/**