From 8ffbc6559493c64d6194c92d856196fdaeb8a5fb Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Wed, 12 Sep 2007 08:32:50 -0300 Subject: V4L/DVB (6451): v4l2: add support for bus-based I2C drivers Two new headers were added: one for I2C drivers that are only used by V4L2 drivers converted to the new bus-based I2C API, and one that can be used by both converted and unconverted drivers (at the expense of some additional overhead). To support the legacy I2C API a helper function was added to v4l2-common.c. These headers take care of all the 'boilerplate' code that all V4L2 I2C drivers have in common and will automatically support the bus-based I2C API introduced in kernel 2.6.22. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- include/media/v4l2-i2c-drv.h | 61 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 include/media/v4l2-i2c-drv.h (limited to 'include/media/v4l2-i2c-drv.h') diff --git a/include/media/v4l2-i2c-drv.h b/include/media/v4l2-i2c-drv.h new file mode 100644 index 000000000000..547db60d3640 --- /dev/null +++ b/include/media/v4l2-i2c-drv.h @@ -0,0 +1,61 @@ +/* + * v4l2-i2c-drv.h - contains I2C handling code that's identical for + * all V4L2 I2C drivers. Use this header if the + * I2C driver is only used by drivers converted + * to the bus-based I2C API. + * + * Copyright (C) 2007 Hans Verkuil + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +struct v4l2_i2c_driver_data { + const char * const name; + int driverid; + int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); + int (*probe)(struct i2c_client *client); + int (*remove)(struct i2c_client *client); + int (*suspend)(struct i2c_client *client, pm_message_t state); + int (*resume)(struct i2c_client *client); + int legacy_class; +}; + +static struct v4l2_i2c_driver_data v4l2_i2c_data; +static struct i2c_client_address_data addr_data; +static struct i2c_driver v4l2_i2c_driver; + + +/* Bus-based I2C implementation for kernels >= 2.6.22 */ + +static int __init v4l2_i2c_drv_init(void) +{ + v4l2_i2c_driver.driver.name = v4l2_i2c_data.name; + v4l2_i2c_driver.id = v4l2_i2c_data.driverid; + v4l2_i2c_driver.command = v4l2_i2c_data.command; + v4l2_i2c_driver.probe = v4l2_i2c_data.probe; + v4l2_i2c_driver.remove = v4l2_i2c_data.remove; + v4l2_i2c_driver.suspend = v4l2_i2c_data.suspend; + v4l2_i2c_driver.resume = v4l2_i2c_data.resume; + return i2c_add_driver(&v4l2_i2c_driver); +} + + +static void __exit v4l2_i2c_drv_cleanup(void) +{ + i2c_del_driver(&v4l2_i2c_driver); +} + +module_init(v4l2_i2c_drv_init); +module_exit(v4l2_i2c_drv_cleanup); -- cgit v1.2.3