patch-2.1.111 linux/drivers/char/i2c.h

• Lines: 167
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.1.110/linux/drivers/char/i2c.h
• Orig date: Wed Jun 24 22:54:05 1998

diff -u --recursive --new-file v2.1.110/linux/drivers/char/i2c.h linux/drivers/char/i2c.h
@@ -1,166 +0,0 @@
-#ifndef I2C_H
-#define I2C_H
-
-/*
- * linux i2c interface.  Works a little bit like the scsi subsystem.
- * There are:
- *
- *     i2c          the basic control module        (like scsi_mod)
- *     bus driver   a driver with a i2c bus         (host adapter driver)
- *     chip driver  a driver for a chip connected
- *                  to a i2c bus                    (cdrom/hd driver)
- *
- * A device will be attached to one bus and one chip driver.  Every chip
- * driver gets a unique ID.
- *
- * A chip driver can provide a ioctl-like callback for the
- * communication with other parts of the kernel (not every i2c chip is
- * useful without other devices, a TV card tuner for example). 
- *
- * "i2c internal" parts of the structs: only the i2c module is allowed to
- * write to them, for others they are read-only.
- *
- */
-
-#define I2C_BUS_MAX       4    /* max # of bus drivers  */
-#define I2C_DRIVER_MAX    8    /* max # of chip drivers */
-#define I2C_DEVICE_MAX    8    /* max # if devices per bus/driver */
-
-struct i2c_bus;
-struct i2c_driver;
-struct i2c_device;
-
-#define I2C_DRIVERID_MSP3400     1
-#define I2C_DRIVERID_TUNER       2
-#define I2C_DRIVERID_VIDEOTEXT	 3
-
-#define I2C_BUSID_BT848		1	/* I2C bus on a BT848 */
-
-/*
- * struct for a driver for a i2c chip (tuner, soundprocessor,
- * videotext, ... ).
- *
- * a driver will register within the i2c module.  The i2c module will
- * callback the driver (i2c_attach) for every device it finds on a i2c
- * bus at the specified address.  If the driver decides to "accept"
- * the, device, it must return a struct i2c_device, and NULL
- * otherwise.
- *
- * i2c_detach = i2c_attach ** -1
- * 
- * i2c_command will be used to pass commands to the driver in a
- * ioctl-line manner.
- *
- */
-
-struct i2c_driver 
-{
-    char           name[32];         /* some useful label         */
-    int            id;               /* device type ID            */
-    unsigned char  addr_l, addr_h;   /* address range of the chip */
-
-    int (*attach)(struct i2c_device *device);
-    int (*detach)(struct i2c_device *device);
-    int (*command)(struct i2c_device *device,unsigned int cmd, void *arg);
-
-    /* i2c internal */
-    struct i2c_device   *devices[I2C_DEVICE_MAX];
-    int                 devcount;
-};
-
-
-/*
- * this holds the informations about a i2c bus available in the system.
- * 
- * a chip with a i2c bus interface (like bt848) registers the bus within
- * the i2c module. This struct provides functions to access the i2c bus.
- * 
- * One must hold the spinlock to access the i2c bus (XXX: is the irqsave
- * required? Maybe better use a semaphore?). 
- * [-AC-] having a spinlock_irqsave is only needed if we have drivers wishing
- *	  to bang their i2c bus from an interrupt.
- * 
- * attach/detach_inform is a callback to inform the bus driver about
- * attached chip drivers.
- *
- */
-
-/* needed: unsigned long flags */
-
-#define LOCK_I2C_BUS(bus)    spin_lock_irqsave(&(bus->bus_lock),flags);
-#define UNLOCK_I2C_BUS(bus)  spin_unlock_irqrestore(&(bus->bus_lock),flags);
-
-struct i2c_bus 
-{
-	char  name[32];         /* some useful label */
-	int   id;
-	void  *data;            /* free for use by the bus driver */
-
-	spinlock_t bus_lock;
-
-	/* attach/detach inform callbacks */
-	void    (*attach_inform)(struct i2c_bus *bus, int id);
-	void    (*detach_inform)(struct i2c_bus *bus, int id);
-
-	/* Software I2C */
-	void    (*i2c_setlines)(struct i2c_bus *bus, int ctrl, int data);
-	int     (*i2c_getdataline)(struct i2c_bus *bus);
-
-	/* Hardware I2C */
-	int     (*i2c_read)(struct i2c_bus *bus, unsigned char addr);
-	int     (*i2c_write)(struct i2c_bus *bus, unsigned char addr,
-			 unsigned char b1, unsigned char b2, int both);
-
-	/* internal data for i2c module */
-	struct i2c_device   *devices[I2C_DEVICE_MAX];
-	int                 devcount;
-};
-
-
-/*
- *	This holds per-device data for a i2c device
- */
-
-struct i2c_device 
-{
-	char           name[32];         /* some useful label */
-	void           *data;            /* free for use by the chip driver */
-	unsigned char  addr;             /* chip addr */
-
-	/* i2c internal */
-	struct i2c_bus     *bus;
-	struct i2c_driver  *driver;
-};
-
-
-/* ------------------------------------------------------------------- */
-/* i2c module functions                                                */
-
-/* register/unregister a i2c bus */
-int i2c_register_bus(struct i2c_bus *bus);
-int i2c_unregister_bus(struct i2c_bus *bus);
-
-/* register/unregister a chip driver */
-int i2c_register_driver(struct i2c_driver *driver);
-int i2c_unregister_driver(struct i2c_driver *driver);
-
-/* send a command to a chip using the ioctl-like callback interface */
-int i2c_control_device(struct i2c_bus *bus, int id,
-		       unsigned int cmd, void *arg);
-
-/* i2c bus access functions */
-void    i2c_start(struct i2c_bus *bus);
-void    i2c_stop(struct i2c_bus *bus);
-void    i2c_one(struct i2c_bus *bus);
-void    i2c_zero(struct i2c_bus *bus);
-int     i2c_ack(struct i2c_bus *bus);
-
-int     i2c_sendbyte(struct i2c_bus *bus,unsigned char data,int wait_for_ack);
-unsigned char i2c_readbyte(struct i2c_bus *bus,int last);
-
-/* i2c (maybe) hardware functions */
-int     i2c_read(struct i2c_bus *bus, unsigned char addr);
-int     i2c_write(struct i2c_bus *bus, unsigned char addr,
-		  unsigned char b1, unsigned char b2, int both);
-
-#endif /* I2C_H */