#include <linux/sched.h> /* for completion */
#include <linux/mutex.h>
-extern struct bus_type i2c_bus_type;
-
/* --- General options ------------------------------------------------ */
struct i2c_msg;
* @name: Indicates the type of the device, usually a chip name that's
* generic enough to hide second-sourcing and compatible revisions.
* @adapter: manages the bus segment hosting this I2C device
+ * @driver: device's driver, hence pointer to access routines
+ * @usage_count: counts current number of users of this client
* @dev: Driver model device node for the slave.
* @irq: indicates the IRQ generated by this device (if any)
* @driver_name: Identifies new-style driver used with this device; also
* used as the module name for hotplug/coldplug modprobe support.
+ * @list: list of active/busy clients
+ * @released: used to synchronize client releases & detaches and references
*
* 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
unsigned short flags, char read_write,
u8 command, int size, union i2c_smbus_data * data);
- /* --- ioctl like call to set div. parameters. */
- int (*algo_control)(struct i2c_adapter *, unsigned int, unsigned long);
-
/* To determine what the adapter supports */
u32 (*functionality) (struct i2c_adapter *);
};
}
/*flags for the client struct: */
-#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
-#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
- /* Must equal I2C_M_TEN below */
+#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
+#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
+ /* Must equal I2C_M_TEN below */
+#define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */
/* i2c adapter classes (bitmask) */
#define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */
struct i2c_client_address_data *address_data,
int (*found_proc) (struct i2c_adapter *, int, int));
-/* An ioctl like call to set div. parameters of the adapter.
- */
-extern int i2c_control(struct i2c_client *,unsigned int, unsigned long);
-
extern struct i2c_adapter* i2c_get_adapter(int id);
extern void i2c_put_adapter(struct i2c_adapter *adap);
}
#endif /* __KERNEL__ */
-/*
- * I2C Message - used for pure i2c transaction, also from /dev interface
+/**
+ * struct i2c_msg - an I2C transaction segment beginning with START
+ * @addr: Slave address, either seven or ten bits. When this is a ten
+ * bit address, I2C_M_TEN must be set in @flags and the adapter
+ * must support I2C_FUNC_10BIT_ADDR.
+ * @flags: I2C_M_RD is handled by all adapters. No other flags may be
+ * provided unless the adapter exported the relevant I2C_FUNC_*
+ * flags through i2c_check_functionality().
+ * @len: Number of data bytes in @buf being read from or written to the
+ * I2C slave address. For read transactions where I2C_M_RECV_LEN
+ * is set, the caller guarantees that this buffer can hold up to
+ * 32 bytes in addition to the initial length byte sent by the
+ * slave (plus, if used, the SMBus PEC); and this value will be
+ * incremented by the number of block data bytes received.
+ * @buf: The buffer into which data is read, or from which it's written.
+ *
+ * An i2c_msg is the low level representation of one segment of an I2C
+ * transaction. It is visible to drivers in the @i2c_transfer() procedure,
+ * to userspace from i2c-dev, and to I2C adapter drivers through the
+ * @i2c_adapter.@master_xfer() method.
+ *
+ * Except when I2C "protocol mangling" is used, all I2C adapters implement
+ * the standard rules for I2C transactions. Each transaction begins with a
+ * START. That is followed by the slave address, and a bit encoding read
+ * versus write. Then follow all the data bytes, possibly including a byte
+ * with SMBus PEC. The transfer terminates with a NAK, or when all those
+ * bytes have been transferred and ACKed. If this is the last message in a
+ * group, it is followed by a STOP. Otherwise it is followed by the next
+ * @i2c_msg transaction segment, beginning with a (repeated) START.
+ *
+ * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
+ * passing certain @flags may have changed those standard protocol behaviors.
+ * Those flags are only for use with broken/nonconforming slaves, and with
+ * adapters which are known to support the specific mangling options they
+ * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
*/
struct i2c_msg {
__u16 addr; /* slave address */
__u16 flags;
-#define I2C_M_TEN 0x10 /* we have a ten bit chip address */
-#define I2C_M_RD 0x01
-#define I2C_M_NOSTART 0x4000
-#define I2C_M_REV_DIR_ADDR 0x2000
-#define I2C_M_IGNORE_NAK 0x1000
-#define I2C_M_NO_RD_ACK 0x0800
-#define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */
+#define I2C_M_TEN 0x0010 /* this is a ten bit chip address */
+#define I2C_M_RD 0x0001 /* read data, from slave to master */
+#define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */
+#define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */
+#define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */
+#define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */
+#define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */
__u16 len; /* msg length */
__u8 *buf; /* pointer to msg data */
};
#define I2C_FUNC_I2C 0x00000001
#define I2C_FUNC_10BIT_ADDR 0x00000002
#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */
-#define I2C_FUNC_SMBUS_HWPEC_CALC 0x00000008 /* SMBus 2.0 */
+#define I2C_FUNC_SMBUS_PEC 0x00000008
#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
#define I2C_FUNC_SMBUS_QUICK 0x00010000
#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
I2C_FUNC_SMBUS_WORD_DATA | \
I2C_FUNC_SMBUS_PROC_CALL | \
I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
- I2C_FUNC_SMBUS_I2C_BLOCK)
+ I2C_FUNC_SMBUS_I2C_BLOCK | \
+ I2C_FUNC_SMBUS_PEC)
/*
* Data for SMBus Messages
#define I2C_SMBUS_I2C_BLOCK_DATA 8
-/* ----- commands for the ioctl like i2c_command call:
- * note that additional calls are defined in the algorithm and hw
- * dependent layers - these can be listed here, or see the
- * corresponding header files.
- */
- /* -> bit-adapter specific ioctls */
-#define I2C_RETRIES 0x0701 /* number of times a device address */
- /* should be polled when not */
- /* acknowledging */
-#define I2C_TIMEOUT 0x0702 /* set timeout - call with int */
-
-
-/* this is for i2c-dev.c */
-#define I2C_SLAVE 0x0703 /* Change slave address */
- /* Attn.: Slave address is 7 or 10 bits */
-#define I2C_SLAVE_FORCE 0x0706 /* Change slave address */
- /* Attn.: Slave address is 7 or 10 bits */
- /* This changes the address, even if it */
- /* is already taken! */
-#define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */
-
-#define I2C_FUNCS 0x0705 /* Get the adapter functionality */
-#define I2C_RDWR 0x0707 /* Combined R/W transfer (one stop only)*/
-#define I2C_PEC 0x0708 /* != 0 for SMBus PEC */
-
-#define I2C_SMBUS 0x0720 /* SMBus-level access */
-
-/* ----- I2C-DEV: char device interface stuff ------------------------- */
#ifdef __KERNEL__
-#define I2C_MAJOR 89 /* Device major number */
-
/* These defines are used for probing i2c client addresses */
/* The length of the option lists */
#define I2C_CLIENT_MAX_OPTS 48
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