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592 lines
19 KiB
592 lines
19 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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v4l2 common internal API header |
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This header contains internal shared ioctl definitions for use by the |
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internal low-level v4l2 drivers. |
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Each ioctl begins with VIDIOC_INT_ to clearly mark that it is an internal |
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define, |
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Copyright (C) 2005 Hans Verkuil <[email protected]> |
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*/ |
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#ifndef V4L2_COMMON_H_ |
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#define V4L2_COMMON_H_ |
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#include <linux/time.h> |
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#include <media/v4l2-dev.h> |
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/* Common printk constructs for v4l-i2c drivers. These macros create a unique |
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prefix consisting of the driver name, the adapter number and the i2c |
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address. */ |
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#define v4l_printk(level, name, adapter, addr, fmt, arg...) \ |
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printk(level "%s %d-%04x: " fmt, name, i2c_adapter_id(adapter), addr , ## arg) |
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#define v4l_client_printk(level, client, fmt, arg...) \ |
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v4l_printk(level, (client)->dev.driver->name, (client)->adapter, \ |
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(client)->addr, fmt , ## arg) |
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#define v4l_err(client, fmt, arg...) \ |
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v4l_client_printk(KERN_ERR, client, fmt , ## arg) |
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#define v4l_warn(client, fmt, arg...) \ |
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v4l_client_printk(KERN_WARNING, client, fmt , ## arg) |
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#define v4l_info(client, fmt, arg...) \ |
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v4l_client_printk(KERN_INFO, client, fmt , ## arg) |
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/* These three macros assume that the debug level is set with a module |
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parameter called 'debug'. */ |
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#define v4l_dbg(level, debug, client, fmt, arg...) \ |
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do { \ |
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if (debug >= (level)) \ |
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v4l_client_printk(KERN_DEBUG, client, fmt , ## arg); \ |
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} while (0) |
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/* Add a version of v4l_dbg to be used on drivers using dev_foo() macros */ |
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#define dev_dbg_lvl(__dev, __level, __debug, __fmt, __arg...) \ |
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do { \ |
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if (__debug >= (__level)) \ |
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dev_printk(KERN_DEBUG, __dev, __fmt, ##__arg); \ |
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} while (0) |
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/* ------------------------------------------------------------------------- */ |
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/* These printk constructs can be used with v4l2_device and v4l2_subdev */ |
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#define v4l2_printk(level, dev, fmt, arg...) \ |
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printk(level "%s: " fmt, (dev)->name , ## arg) |
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#define v4l2_err(dev, fmt, arg...) \ |
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v4l2_printk(KERN_ERR, dev, fmt , ## arg) |
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#define v4l2_warn(dev, fmt, arg...) \ |
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v4l2_printk(KERN_WARNING, dev, fmt , ## arg) |
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#define v4l2_info(dev, fmt, arg...) \ |
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v4l2_printk(KERN_INFO, dev, fmt , ## arg) |
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/* These three macros assume that the debug level is set with a module |
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parameter called 'debug'. */ |
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#define v4l2_dbg(level, debug, dev, fmt, arg...) \ |
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do { \ |
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if (debug >= (level)) \ |
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v4l2_printk(KERN_DEBUG, dev, fmt , ## arg); \ |
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} while (0) |
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/** |
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* v4l2_ctrl_query_fill- Fill in a struct v4l2_queryctrl |
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* |
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* @qctrl: pointer to the &struct v4l2_queryctrl to be filled |
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* @min: minimum value for the control |
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* @max: maximum value for the control |
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* @step: control step |
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* @def: default value for the control |
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* |
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* Fills the &struct v4l2_queryctrl fields for the query control. |
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* |
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* .. note:: |
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* |
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* This function assumes that the @qctrl->id field is filled. |
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* |
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* Returns -EINVAL if the control is not known by the V4L2 core, 0 on success. |
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*/ |
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int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, |
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s32 min, s32 max, s32 step, s32 def); |
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/* ------------------------------------------------------------------------- */ |
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struct v4l2_device; |
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struct v4l2_subdev; |
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struct v4l2_subdev_ops; |
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/* I2C Helper functions */ |
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#include <linux/i2c.h> |
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|
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/** |
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* enum v4l2_i2c_tuner_type - specifies the range of tuner address that |
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* should be used when seeking for I2C devices. |
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* |
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* @ADDRS_RADIO: Radio tuner addresses. |
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* Represent the following I2C addresses: |
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* 0x10 (if compiled with tea5761 support) |
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* and 0x60. |
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* @ADDRS_DEMOD: Demod tuner addresses. |
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* Represent the following I2C addresses: |
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* 0x42, 0x43, 0x4a and 0x4b. |
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* @ADDRS_TV: TV tuner addresses. |
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* Represent the following I2C addresses: |
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* 0x42, 0x43, 0x4a, 0x4b, 0x60, 0x61, 0x62, |
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* 0x63 and 0x64. |
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* @ADDRS_TV_WITH_DEMOD: TV tuner addresses if demod is present, this |
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* excludes addresses used by the demodulator |
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* from the list of candidates. |
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* Represent the following I2C addresses: |
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* 0x60, 0x61, 0x62, 0x63 and 0x64. |
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* |
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* NOTE: All I2C addresses above use the 7-bit notation. |
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*/ |
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enum v4l2_i2c_tuner_type { |
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ADDRS_RADIO, |
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ADDRS_DEMOD, |
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ADDRS_TV, |
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ADDRS_TV_WITH_DEMOD, |
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}; |
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#if defined(CONFIG_VIDEO_V4L2_I2C) |
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/** |
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* v4l2_i2c_new_subdev - Load an i2c module and return an initialized |
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* &struct v4l2_subdev. |
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* |
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* @v4l2_dev: pointer to &struct v4l2_device |
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* @adapter: pointer to struct i2c_adapter |
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* @client_type: name of the chip that's on the adapter. |
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* @addr: I2C address. If zero, it will use @probe_addrs |
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* @probe_addrs: array with a list of address. The last entry at such |
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* array should be %I2C_CLIENT_END. |
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* |
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* returns a &struct v4l2_subdev pointer. |
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*/ |
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struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev, |
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struct i2c_adapter *adapter, const char *client_type, |
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u8 addr, const unsigned short *probe_addrs); |
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/** |
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* v4l2_i2c_new_subdev_board - Load an i2c module and return an initialized |
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* &struct v4l2_subdev. |
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* |
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* @v4l2_dev: pointer to &struct v4l2_device |
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* @adapter: pointer to struct i2c_adapter |
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* @info: pointer to struct i2c_board_info used to replace the irq, |
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* platform_data and addr arguments. |
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* @probe_addrs: array with a list of address. The last entry at such |
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* array should be %I2C_CLIENT_END. |
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* |
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* returns a &struct v4l2_subdev pointer. |
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*/ |
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struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev, |
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struct i2c_adapter *adapter, struct i2c_board_info *info, |
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const unsigned short *probe_addrs); |
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/** |
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* v4l2_i2c_subdev_set_name - Set name for an I²C sub-device |
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* |
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* @sd: pointer to &struct v4l2_subdev |
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* @client: pointer to struct i2c_client |
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* @devname: the name of the device; if NULL, the I²C device's name will be used |
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* @postfix: sub-device specific string to put right after the I²C device name; |
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* may be NULL |
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*/ |
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void v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd, struct i2c_client *client, |
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const char *devname, const char *postfix); |
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/** |
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* v4l2_i2c_subdev_init - Initializes a &struct v4l2_subdev with data from |
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* an i2c_client struct. |
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* |
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* @sd: pointer to &struct v4l2_subdev |
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* @client: pointer to struct i2c_client |
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* @ops: pointer to &struct v4l2_subdev_ops |
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*/ |
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void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client, |
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const struct v4l2_subdev_ops *ops); |
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/** |
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* v4l2_i2c_subdev_addr - returns i2c client address of &struct v4l2_subdev. |
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* |
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* @sd: pointer to &struct v4l2_subdev |
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* |
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* Returns the address of an I2C sub-device |
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*/ |
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unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd); |
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/** |
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* v4l2_i2c_tuner_addrs - Return a list of I2C tuner addresses to probe. |
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* |
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* @type: type of the tuner to seek, as defined by |
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* &enum v4l2_i2c_tuner_type. |
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* |
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* NOTE: Use only if the tuner addresses are unknown. |
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*/ |
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const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type); |
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/** |
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* v4l2_i2c_subdev_unregister - Unregister a v4l2_subdev |
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* |
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* @sd: pointer to &struct v4l2_subdev |
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*/ |
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void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd); |
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#else |
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static inline struct v4l2_subdev * |
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v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev, |
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struct i2c_adapter *adapter, const char *client_type, |
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u8 addr, const unsigned short *probe_addrs) |
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{ |
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return NULL; |
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} |
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static inline struct v4l2_subdev * |
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v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev, |
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struct i2c_adapter *adapter, struct i2c_board_info *info, |
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const unsigned short *probe_addrs) |
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{ |
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return NULL; |
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} |
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static inline void |
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v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd, struct i2c_client *client, |
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const char *devname, const char *postfix) |
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{} |
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static inline void |
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v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client, |
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const struct v4l2_subdev_ops *ops) |
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{} |
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static inline unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd) |
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{ |
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return I2C_CLIENT_END; |
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} |
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static inline const unsigned short * |
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v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type) |
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{ |
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return NULL; |
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} |
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static inline void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd) |
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{} |
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#endif |
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/* ------------------------------------------------------------------------- */ |
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/* SPI Helper functions */ |
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#include <linux/spi/spi.h> |
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#if defined(CONFIG_SPI) |
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/** |
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* v4l2_spi_new_subdev - Load an spi module and return an initialized |
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* &struct v4l2_subdev. |
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* |
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* |
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* @v4l2_dev: pointer to &struct v4l2_device. |
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* @master: pointer to struct spi_master. |
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* @info: pointer to struct spi_board_info. |
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* |
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* returns a &struct v4l2_subdev pointer. |
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*/ |
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struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev, |
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struct spi_master *master, struct spi_board_info *info); |
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/** |
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* v4l2_spi_subdev_init - Initialize a v4l2_subdev with data from an |
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* spi_device struct. |
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* |
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* @sd: pointer to &struct v4l2_subdev |
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* @spi: pointer to struct spi_device. |
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* @ops: pointer to &struct v4l2_subdev_ops |
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*/ |
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void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi, |
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const struct v4l2_subdev_ops *ops); |
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/** |
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* v4l2_spi_subdev_unregister - Unregister a v4l2_subdev |
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* |
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* @sd: pointer to &struct v4l2_subdev |
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*/ |
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void v4l2_spi_subdev_unregister(struct v4l2_subdev *sd); |
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#else |
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static inline struct v4l2_subdev * |
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v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev, |
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struct spi_master *master, struct spi_board_info *info) |
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{ |
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return NULL; |
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} |
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static inline void |
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v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi, |
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const struct v4l2_subdev_ops *ops) |
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{} |
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static inline void v4l2_spi_subdev_unregister(struct v4l2_subdev *sd) |
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{} |
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#endif |
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/* ------------------------------------------------------------------------- */ |
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/* |
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* FIXME: these remaining ioctls/structs should be removed as well, but they |
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* are still used in tuner-simple.c (TUNER_SET_CONFIG) and cx18/ivtv (RESET). |
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* To remove these ioctls some more cleanup is needed in those modules. |
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* |
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* It doesn't make much sense on documenting them, as what we really want is |
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* to get rid of them. |
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*/ |
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/* s_config */ |
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struct v4l2_priv_tun_config { |
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int tuner; |
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void *priv; |
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}; |
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#define TUNER_SET_CONFIG _IOW('d', 92, struct v4l2_priv_tun_config) |
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#define VIDIOC_INT_RESET _IOW ('d', 102, u32) |
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/* ------------------------------------------------------------------------- */ |
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/* Miscellaneous helper functions */ |
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/** |
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* v4l_bound_align_image - adjust video dimensions according to |
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* a given constraints. |
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* |
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* @width: pointer to width that will be adjusted if needed. |
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* @wmin: minimum width. |
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* @wmax: maximum width. |
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* @walign: least significant bit on width. |
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* @height: pointer to height that will be adjusted if needed. |
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* @hmin: minimum height. |
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* @hmax: maximum height. |
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* @halign: least significant bit on height. |
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* @salign: least significant bit for the image size (e. g. |
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* :math:`width * height`). |
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* |
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* Clip an image to have @width between @wmin and @wmax, and @height between |
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* @hmin and @hmax, inclusive. |
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* |
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* Additionally, the @width will be a multiple of :math:`2^{walign}`, |
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* the @height will be a multiple of :math:`2^{halign}`, and the overall |
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* size :math:`width * height` will be a multiple of :math:`2^{salign}`. |
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* |
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* .. note:: |
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* |
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* #. The clipping rectangle may be shrunk or enlarged to fit the alignment |
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* constraints. |
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* #. @wmax must not be smaller than @wmin. |
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* #. @hmax must not be smaller than @hmin. |
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* #. The alignments must not be so high there are no possible image |
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* sizes within the allowed bounds. |
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* #. @wmin and @hmin must be at least 1 (don't use 0). |
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* #. For @walign, @halign and @salign, if you don't care about a certain |
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* alignment, specify ``0``, as :math:`2^0 = 1` and one byte alignment |
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* is equivalent to no alignment. |
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* #. If you only want to adjust downward, specify a maximum that's the |
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* same as the initial value. |
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*/ |
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void v4l_bound_align_image(unsigned int *width, unsigned int wmin, |
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unsigned int wmax, unsigned int walign, |
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unsigned int *height, unsigned int hmin, |
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unsigned int hmax, unsigned int halign, |
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unsigned int salign); |
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/** |
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* v4l2_find_nearest_size - Find the nearest size among a discrete |
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* set of resolutions contained in an array of a driver specific struct. |
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* |
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* @array: a driver specific array of image sizes |
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* @array_size: the length of the driver specific array of image sizes |
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* @width_field: the name of the width field in the driver specific struct |
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* @height_field: the name of the height field in the driver specific struct |
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* @width: desired width. |
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* @height: desired height. |
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* |
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* Finds the closest resolution to minimize the width and height differences |
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* between what requested and the supported resolutions. The size of the width |
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* and height fields in the driver specific must equal to that of u32, i.e. four |
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* bytes. |
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* |
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* Returns the best match or NULL if the length of the array is zero. |
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*/ |
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#define v4l2_find_nearest_size(array, array_size, width_field, height_field, \ |
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width, height) \ |
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({ \ |
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BUILD_BUG_ON(sizeof((array)->width_field) != sizeof(u32) || \ |
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sizeof((array)->height_field) != sizeof(u32)); \ |
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(typeof(&(array)[0]))__v4l2_find_nearest_size( \ |
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(array), array_size, sizeof(*(array)), \ |
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offsetof(typeof(*(array)), width_field), \ |
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offsetof(typeof(*(array)), height_field), \ |
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width, height); \ |
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}) |
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const void * |
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__v4l2_find_nearest_size(const void *array, size_t array_size, |
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size_t entry_size, size_t width_offset, |
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size_t height_offset, s32 width, s32 height); |
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/** |
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* v4l2_g_parm_cap - helper routine for vidioc_g_parm to fill this in by |
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* calling the g_frame_interval op of the given subdev. It only works |
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* for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the |
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* function name. |
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* |
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* @vdev: the struct video_device pointer. Used to determine the device caps. |
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* @sd: the sub-device pointer. |
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* @a: the VIDIOC_G_PARM argument. |
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*/ |
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int v4l2_g_parm_cap(struct video_device *vdev, |
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struct v4l2_subdev *sd, struct v4l2_streamparm *a); |
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/** |
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* v4l2_s_parm_cap - helper routine for vidioc_s_parm to fill this in by |
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* calling the s_frame_interval op of the given subdev. It only works |
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* for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the |
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* function name. |
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* |
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* @vdev: the struct video_device pointer. Used to determine the device caps. |
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* @sd: the sub-device pointer. |
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* @a: the VIDIOC_S_PARM argument. |
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*/ |
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int v4l2_s_parm_cap(struct video_device *vdev, |
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struct v4l2_subdev *sd, struct v4l2_streamparm *a); |
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/* Compare two v4l2_fract structs */ |
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#define V4L2_FRACT_COMPARE(a, OP, b) \ |
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((u64)(a).numerator * (b).denominator OP \ |
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(u64)(b).numerator * (a).denominator) |
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/* ------------------------------------------------------------------------- */ |
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/* Pixel format and FourCC helpers */ |
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/** |
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* enum v4l2_pixel_encoding - specifies the pixel encoding value |
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* |
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* @V4L2_PIXEL_ENC_UNKNOWN: Pixel encoding is unknown/un-initialized |
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* @V4L2_PIXEL_ENC_YUV: Pixel encoding is YUV |
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* @V4L2_PIXEL_ENC_RGB: Pixel encoding is RGB |
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* @V4L2_PIXEL_ENC_BAYER: Pixel encoding is Bayer |
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*/ |
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enum v4l2_pixel_encoding { |
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V4L2_PIXEL_ENC_UNKNOWN = 0, |
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V4L2_PIXEL_ENC_YUV = 1, |
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V4L2_PIXEL_ENC_RGB = 2, |
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V4L2_PIXEL_ENC_BAYER = 3, |
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}; |
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/** |
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* struct v4l2_format_info - information about a V4L2 format |
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* @format: 4CC format identifier (V4L2_PIX_FMT_*) |
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* @pixel_enc: Pixel encoding (see enum v4l2_pixel_encoding above) |
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* @mem_planes: Number of memory planes, which includes the alpha plane (1 to 4). |
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* @comp_planes: Number of component planes, which includes the alpha plane (1 to 4). |
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* @bpp: Array of per-plane bytes per pixel |
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* @hdiv: Horizontal chroma subsampling factor |
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* @vdiv: Vertical chroma subsampling factor |
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* @block_w: Per-plane macroblock pixel width (optional) |
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* @block_h: Per-plane macroblock pixel height (optional) |
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*/ |
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struct v4l2_format_info { |
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u32 format; |
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u8 pixel_enc; |
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u8 mem_planes; |
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u8 comp_planes; |
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u8 bpp[4]; |
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u8 hdiv; |
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u8 vdiv; |
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u8 block_w[4]; |
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u8 block_h[4]; |
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}; |
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static inline bool v4l2_is_format_rgb(const struct v4l2_format_info *f) |
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{ |
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return f && f->pixel_enc == V4L2_PIXEL_ENC_RGB; |
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} |
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static inline bool v4l2_is_format_yuv(const struct v4l2_format_info *f) |
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{ |
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return f && f->pixel_enc == V4L2_PIXEL_ENC_YUV; |
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} |
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static inline bool v4l2_is_format_bayer(const struct v4l2_format_info *f) |
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{ |
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return f && f->pixel_enc == V4L2_PIXEL_ENC_BAYER; |
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} |
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const struct v4l2_format_info *v4l2_format_info(u32 format); |
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void v4l2_apply_frmsize_constraints(u32 *width, u32 *height, |
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const struct v4l2_frmsize_stepwise *frmsize); |
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int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, u32 pixelformat, |
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u32 width, u32 height); |
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int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, u32 pixelformat, |
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u32 width, u32 height); |
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|
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/** |
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* v4l2_get_link_freq - Get link rate from transmitter |
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* |
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* @handler: The transmitter's control handler |
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* @mul: The multiplier between pixel rate and link frequency. Bits per pixel on |
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* D-PHY, samples per clock on parallel. 0 otherwise. |
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* @div: The divisor between pixel rate and link frequency. Number of data lanes |
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* times two on D-PHY, 1 on parallel. 0 otherwise. |
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* |
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* This function is intended for obtaining the link frequency from the |
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* transmitter sub-devices. It returns the link rate, either from the |
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* V4L2_CID_LINK_FREQ control implemented by the transmitter, or value |
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* calculated based on the V4L2_CID_PIXEL_RATE implemented by the transmitter. |
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* |
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* Returns link frequency on success, otherwise a negative error code: |
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* -ENOENT: Link frequency or pixel rate control not found |
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* -EINVAL: Invalid link frequency value |
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*/ |
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s64 v4l2_get_link_freq(struct v4l2_ctrl_handler *handler, unsigned int mul, |
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unsigned int div); |
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static inline u64 v4l2_buffer_get_timestamp(const struct v4l2_buffer *buf) |
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{ |
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/* |
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* When the timestamp comes from 32-bit user space, there may be |
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* uninitialized data in tv_usec, so cast it to u32. |
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* Otherwise allow invalid input for backwards compatibility. |
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*/ |
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return buf->timestamp.tv_sec * NSEC_PER_SEC + |
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(u32)buf->timestamp.tv_usec * NSEC_PER_USEC; |
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} |
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|
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static inline void v4l2_buffer_set_timestamp(struct v4l2_buffer *buf, |
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u64 timestamp) |
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{ |
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struct timespec64 ts = ns_to_timespec64(timestamp); |
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|
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buf->timestamp.tv_sec = ts.tv_sec; |
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buf->timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC; |
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} |
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static inline bool v4l2_is_colorspace_valid(__u32 colorspace) |
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{ |
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return colorspace > V4L2_COLORSPACE_DEFAULT && |
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colorspace <= V4L2_COLORSPACE_DCI_P3; |
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} |
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static inline bool v4l2_is_xfer_func_valid(__u32 xfer_func) |
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{ |
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return xfer_func > V4L2_XFER_FUNC_DEFAULT && |
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xfer_func <= V4L2_XFER_FUNC_SMPTE2084; |
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} |
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static inline bool v4l2_is_ycbcr_enc_valid(__u8 ycbcr_enc) |
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{ |
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return ycbcr_enc > V4L2_YCBCR_ENC_DEFAULT && |
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ycbcr_enc <= V4L2_YCBCR_ENC_SMPTE240M; |
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} |
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static inline bool v4l2_is_hsv_enc_valid(__u8 hsv_enc) |
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{ |
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return hsv_enc == V4L2_HSV_ENC_180 || hsv_enc == V4L2_HSV_ENC_256; |
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} |
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static inline bool v4l2_is_quant_valid(__u8 quantization) |
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{ |
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return quantization == V4L2_QUANTIZATION_FULL_RANGE || |
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quantization == V4L2_QUANTIZATION_LIM_RANGE; |
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} |
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|
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#endif /* V4L2_COMMON_H_ */
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