i2c: Add a sysfs interface to instantiate devices

Add a sysfs interface to instantiate and delete I2C devices. This is
primarily a replacement of the force_* module parameters implemented
by some i2c drivers. These module parameters were implemented
internally by the I2C_CLIENT_INSMOD* macros, which don't scale well.

This can also be used when developing a driver on a self-soldered
board which doesn't yet have proper I2C device declaration at the
platform level, and presumably for various debugging situations.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: David Brownell <dbrownell@users.sourceforge.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 5f8157610c64..844d2662a875 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -178,7 +178,8 @@ struct i2c_driver {
  * @driver: device's driver, hence pointer to access routines
  * @dev: Driver model device node for the slave.
  * @irq: indicates the IRQ generated by this device (if any)
- * @detected: member of an i2c_driver.clients list
+ * @detected: member of an i2c_driver.clients list or i2c-core's
+ *      userspace_devices list
  *
  * 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