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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 <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/*
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* v4l2-i2c-drv.h - contains I2C handling code that's identical for
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* all V4L2 I2C drivers. Use this header if the
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* I2C driver is only used by drivers converted
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* to the bus-based I2C API.
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*
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* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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struct v4l2_i2c_driver_data {
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const char * const name;
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int driverid;
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int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
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int (*probe)(struct i2c_client *client);
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int (*remove)(struct i2c_client *client);
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int (*suspend)(struct i2c_client *client, pm_message_t state);
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int (*resume)(struct i2c_client *client);
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int legacy_class;
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};
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static struct v4l2_i2c_driver_data v4l2_i2c_data;
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static struct i2c_client_address_data addr_data;
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static struct i2c_driver v4l2_i2c_driver;
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/* Bus-based I2C implementation for kernels >= 2.6.22 */
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static int __init v4l2_i2c_drv_init(void)
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{
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v4l2_i2c_driver.driver.name = v4l2_i2c_data.name;
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v4l2_i2c_driver.id = v4l2_i2c_data.driverid;
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v4l2_i2c_driver.command = v4l2_i2c_data.command;
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v4l2_i2c_driver.probe = v4l2_i2c_data.probe;
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v4l2_i2c_driver.remove = v4l2_i2c_data.remove;
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v4l2_i2c_driver.suspend = v4l2_i2c_data.suspend;
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v4l2_i2c_driver.resume = v4l2_i2c_data.resume;
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return i2c_add_driver(&v4l2_i2c_driver);
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}
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static void __exit v4l2_i2c_drv_cleanup(void)
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{
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i2c_del_driver(&v4l2_i2c_driver);
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}
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module_init(v4l2_i2c_drv_init);
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module_exit(v4l2_i2c_drv_cleanup);
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