diff options
Diffstat (limited to 'linux/include/media/v4l2-i2c-drv.h')
| -rw-r--r-- | linux/include/media/v4l2-i2c-drv.h | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/linux/include/media/v4l2-i2c-drv.h b/linux/include/media/v4l2-i2c-drv.h new file mode 100644 index 000000000..f027f27fb --- /dev/null +++ b/linux/include/media/v4l2-i2c-drv.h @@ -0,0 +1,199 @@ +/* + * 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 <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); +#ifdef I2C_CLASS_TV_ANALOG + int legacy_class; +#else + int legacy_id; +#endif +}; + +static struct v4l2_i2c_driver_data v4l2_i2c_data; +static struct i2c_client_address_data addr_data; +static struct i2c_driver v4l2_i2c_driver; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) + +/* 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); +} + +#else + +/* Bus-based I2C API is not present, add legacy code */ + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0) +static int v4l2_i2c_drv_attach_legacy(struct i2c_adapter *adapter, int address, int kind) +#else +static int v4l2_i2c_drv_attach_legacy(struct i2c_adapter *adapter, int address, + unsigned short flags, int kind) +#endif +{ + return v4l2_i2c_attach(adapter, address, &v4l2_i2c_driver, + v4l2_i2c_data.name, v4l2_i2c_data.probe); +} + +static int v4l2_i2c_drv_probe_legacy(struct i2c_adapter *adapter) +{ +#ifdef I2C_CLASS_TV_ANALOG + if (adapter->class & v4l2_i2c_data.legacy_class) +#else + if (adapter->id == v4l2_i2c_data.legacy_id) +#endif + 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 = i2c_detach_client(client); + + if (err) + return err; + if (v4l2_i2c_data.remove) + v4l2_i2c_data.remove(client); + kfree(client); + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) + MOD_DEC_USE_COUNT; +#endif + return 0; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,14) +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,20) +static int v4l2_i2c_drv_suspend_helper(struct i2c_client *client, pm_message_t state) +#else +static int v4l2_i2c_drv_suspend_helper(struct device * dev, pm_message_t state) +#endif +#else +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13) +static int v4l2_i2c_drv_suspend_helper(struct device * dev, pm_message_t state, u32 level) +#else +static int v4l2_i2c_drv_suspend_helper(struct device * dev, u32 state, u32 level) +#endif +#endif +{ +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,20) + struct i2c_client *client = container_of(dev, struct i2c_client, dev); +#endif + return v4l2_i2c_data.suspend ? v4l2_i2c_data.suspend(client, state) : 0; +} + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,14) +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,20) +static int v4l2_i2c_drv_resume_helper(struct i2c_client *client) +#else +static int v4l2_i2c_drv_resume_helper(struct device * dev) +#endif +#else +static int v4l2_i2c_drv_resume_helper(struct device * dev, u32 level) +#endif +{ +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,20) + struct i2c_client *client = container_of(dev, struct i2c_client, dev); +#endif + return v4l2_i2c_data.resume ? v4l2_i2c_data.resume(client) : 0; +} +#endif + +/* ----------------------------------------------------------------------- */ + +static struct i2c_driver v4l2_i2c_driver = { +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)) && (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,15)) + .owner = THIS_MODULE, +#endif +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,15) + .flags = I2C_DF_NOTIFY, +#endif +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0) + .driver = { +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,15) + .owner = THIS_MODULE, +#endif +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,20) + .suspend = v4l2_i2c_drv_suspend_helper, + .resume = v4l2_i2c_drv_resume_helper, +#endif + }, +#endif + .attach_adapter = v4l2_i2c_drv_probe_legacy, + .detach_client = v4l2_i2c_drv_detach_legacy, +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,20) + .suspend = v4l2_i2c_drv_suspend_helper, + .resume = v4l2_i2c_drv_resume_helper, +#endif +}; + +/* ----------------------------------------------------------------------- */ + +static int __init v4l2_i2c_drv_init(void) +{ +#ifdef I2C_CLASS_TV_ANALOG + if (v4l2_i2c_data.legacy_class == 0) + v4l2_i2c_data.legacy_class = I2C_CLASS_TV_ANALOG; +#else + if (v4l2_i2c_data.legacy_id == 0) + v4l2_i2c_data.legacy_id = I2C_HW_B_BT848; +#endif + +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,15) + strlcpy(v4l2_i2c_driver.name, v4l2_i2c_data.name, sizeof(v4l2_i2c_driver.name)); +#else + v4l2_i2c_driver.driver.name = v4l2_i2c_data.name; +#endif + v4l2_i2c_driver.id = v4l2_i2c_data.driverid; + v4l2_i2c_driver.command = v4l2_i2c_data.command; + return i2c_add_driver(&v4l2_i2c_driver); +} + +/* End legacy code */ + +#endif + +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); |