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-rw-r--r--vtx/i2c.h165
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diff --git a/vtx/i2c.h b/vtx/i2c.h
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--- a/vtx/i2c.h
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-#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 (hostadapter driver)
- * chip driver a driver for a chip connected
- * to a i2c bus (cdrom/hd driver)
- *
- + a devices 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
-
-/*
- * 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?).
- *
- * attach/detach_inform is a callback to inform the bus driver about
- * attached chip drivers.
- *
- */
-
-/* needed: unsigned long flags */
-#if LINUX_VERSION_CODE >= 0x020100
-#define LOCK_I2C_BUS(bus) spin_lock_irqsave(&(bus->bus_lock),flags);
-#define UNLOCK_I2C_BUS(bus) spin_unlock_irqrestore(&(bus->bus_lock),flags);
-#else
-#define LOCK_I2C_BUS(bus) { save_flags(flags); cli(); }
-#define UNLOCK_I2C_BUS(bus) { restore_flags(flags); }
-#endif
-
-struct i2c_bus {
- char name[32]; /* some useful label */
- void *data; /* free for use by the bus driver */
-
-#if LINUX_VERSION_CODE >= 0x020100
- spinlock_t bus_lock;
-#endif
-
- /* 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 */

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