/* * v4l2-i2c-drv-legacy.h - contains I2C handling code that's identical * for all V4L2 I2C drivers. Use this header if the * I2C driver is used by both legacy drivers and * drivers converted to the bus-based I2C API. * * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> * * 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_probe)(struct i2c_adapter *adapter); int legacy_class; }; static struct v4l2_i2c_driver_data v4l2_i2c_data; static const struct i2c_client_address_data addr_data; static struct i2c_driver v4l2_i2c_driver_legacy; static char v4l2_i2c_drv_name_legacy[32]; static int v4l2_i2c_drv_attach_legacy(struct i2c_adapter *adapter, int address, int kind) { return v4l2_i2c_attach(adapter, address, &v4l2_i2c_driver_legacy, v4l2_i2c_drv_name_legacy, v4l2_i2c_data.probe); } static int v4l2_i2c_drv_probe_legacy(struct i2c_adapter *adapter) { if (v4l2_i2c_data.legacy_probe) { if (v4l2_i2c_data.legacy_probe(adapter)) return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy); return 0; } if (adapter->class & v4l2_i2c_data.legacy_class) return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy); return 0; } static int v4l2_i2c_drv_detach_legacy(struct i2c_client *client) { int err; if (v4l2_i2c_data.remove) v4l2_i2c_data.remove(client); err = i2c_detach_client(client); if (err) return err; kfree(client); return 0; } static int v4l2_i2c_drv_suspend_helper(struct i2c_client *client, pm_message_t state) { return v4l2_i2c_data.suspend ? v4l2_i2c_data.suspend(client, state) : 0; } static int v4l2_i2c_drv_resume_helper(struct i2c_client *client) { return v4l2_i2c_data.resume ? v4l2_i2c_data.resume(client) : 0; } /* ----------------------------------------------------------------------- */ /* i2c implementation */ static struct i2c_driver v4l2_i2c_driver_legacy = { .driver = { .owner = THIS_MODULE, }, .attach_adapter = v4l2_i2c_drv_probe_legacy, .detach_client = v4l2_i2c_drv_detach_legacy, .suspend = v4l2_i2c_drv_suspend_helper, .resume = v4l2_i2c_drv_resume_helper, }; /* ----------------------------------------------------------------------- */ /* i2c implementation */ static struct i2c_driver v4l2_i2c_driver = { .suspend = v4l2_i2c_drv_suspend_helper, .resume = v4l2_i2c_drv_resume_helper, }; static int __init v4l2_i2c_drv_init(void) { int err; strlcpy(v4l2_i2c_drv_name_legacy, v4l2_i2c_data.name, sizeof(v4l2_i2c_drv_name_legacy)); strlcat(v4l2_i2c_drv_name_legacy, "'", sizeof(v4l2_i2c_drv_name_legacy)); if (v4l2_i2c_data.legacy_class == 0) v4l2_i2c_data.legacy_class = I2C_CLASS_TV_ANALOG; v4l2_i2c_driver_legacy.driver.name = v4l2_i2c_drv_name_legacy; v4l2_i2c_driver_legacy.id = v4l2_i2c_data.driverid; v4l2_i2c_driver_legacy.command = v4l2_i2c_data.command; err = i2c_add_driver(&v4l2_i2c_driver_legacy); if (err) return err; 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; err = i2c_add_driver(&v4l2_i2c_driver); if (err) i2c_del_driver(&v4l2_i2c_driver_legacy); return err; } static void __exit v4l2_i2c_drv_cleanup(void) { i2c_del_driver(&v4l2_i2c_driver_legacy); i2c_del_driver(&v4l2_i2c_driver); } module_init(v4l2_i2c_drv_init); module_exit(v4l2_i2c_drv_cleanup);