408 lines
12 KiB
C
408 lines
12 KiB
C
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/*
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* Video for Linux Two
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*
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* A generic video device interface for the LINUX operating system
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* using a set of device structures/vectors for low level operations.
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*
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* This file replaces the videodev.c file that comes with the
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* regular kernel distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Author: Bill Dirks <bill@thedirks.org>
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* based on code by Alan Cox, <alan@cymru.net>
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*
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*/
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/*
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* Video capture interface for Linux
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*
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* A generic video device interface for the LINUX operating system
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* using a set of device structures/vectors for low level operations.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Author: Alan Cox, <alan@lxorguk.ukuu.org.uk>
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*
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* Fixes:
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*/
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/*
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* Video4linux 1/2 integration by Justin Schoeman
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* <justin@suntiger.ee.up.ac.za>
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* 2.4 PROCFS support ported from 2.4 kernels by
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* Iñaki García Etxebarria <garetxe@euskalnet.net>
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* Makefile fix by "W. Michael Petullo" <mike@flyn.org>
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* 2.4 devfs support ported from 2.4 kernels by
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* Dan Merillat <dan@merillat.org>
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* Added Gerd Knorrs v4l1 enhancements (Justin Schoeman)
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/i2c.h>
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#if defined(CONFIG_SPI)
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#include <linux/spi/spi.h>
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#endif
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/io.h>
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#include <asm/div64.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ctrls.h>
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#include <linux/videodev2.h>
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MODULE_AUTHOR("Bill Dirks, Justin Schoeman, Gerd Knorr");
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MODULE_DESCRIPTION("misc helper functions for v4l2 device drivers");
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MODULE_LICENSE("GPL");
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/*
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*
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* V 4 L 2 D R I V E R H E L P E R A P I
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*
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*/
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/*
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* Video Standard Operations (contributed by Michael Schimek)
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*/
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/* Helper functions for control handling */
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/* Fill in a struct v4l2_queryctrl */
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int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 _min, s32 _max, s32 _step, s32 _def)
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{
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const char *name;
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s64 min = _min;
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s64 max = _max;
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u64 step = _step;
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s64 def = _def;
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v4l2_ctrl_fill(qctrl->id, &name, &qctrl->type,
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&min, &max, &step, &def, &qctrl->flags);
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if (name == NULL)
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return -EINVAL;
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qctrl->minimum = min;
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qctrl->maximum = max;
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qctrl->step = step;
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qctrl->default_value = def;
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qctrl->reserved[0] = qctrl->reserved[1] = 0;
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strlcpy(qctrl->name, name, sizeof(qctrl->name));
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return 0;
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}
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EXPORT_SYMBOL(v4l2_ctrl_query_fill);
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/* I2C Helper functions */
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#if IS_ENABLED(CONFIG_I2C)
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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_subdev_init(sd, ops);
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sd->flags |= V4L2_SUBDEV_FL_IS_I2C;
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/* the owner is the same as the i2c_client's driver owner */
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sd->owner = client->dev.driver->owner;
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sd->dev = &client->dev;
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/* i2c_client and v4l2_subdev point to one another */
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v4l2_set_subdevdata(sd, client);
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i2c_set_clientdata(client, sd);
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/* initialize name */
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snprintf(sd->name, sizeof(sd->name), "%s %d-%04x",
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client->dev.driver->name, i2c_adapter_id(client->adapter),
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client->addr);
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_init);
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/* Load an i2c sub-device. */
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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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struct v4l2_subdev *sd = NULL;
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struct i2c_client *client;
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BUG_ON(!v4l2_dev);
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request_module(I2C_MODULE_PREFIX "%s", info->type);
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/* Create the i2c client */
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if (info->addr == 0 && probe_addrs)
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client = i2c_new_probed_device(adapter, info, probe_addrs,
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NULL);
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else
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client = i2c_new_device(adapter, info);
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/* Note: by loading the module first we are certain that c->driver
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will be set if the driver was found. If the module was not loaded
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first, then the i2c core tries to delay-load the module for us,
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and then c->driver is still NULL until the module is finally
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loaded. This delay-load mechanism doesn't work if other drivers
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want to use the i2c device, so explicitly loading the module
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is the best alternative. */
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if (client == NULL || client->dev.driver == NULL)
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goto error;
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/* Lock the module so we can safely get the v4l2_subdev pointer */
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if (!try_module_get(client->dev.driver->owner))
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goto error;
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sd = i2c_get_clientdata(client);
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/* Register with the v4l2_device which increases the module's
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use count as well. */
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if (v4l2_device_register_subdev(v4l2_dev, sd))
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sd = NULL;
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/* Decrease the module use count to match the first try_module_get. */
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module_put(client->dev.driver->owner);
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error:
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/* If we have a client but no subdev, then something went wrong and
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we must unregister the client. */
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if (client && sd == NULL)
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i2c_unregister_device(client);
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return sd;
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_board);
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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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struct i2c_board_info info;
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/* Setup the i2c board info with the device type and
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the device address. */
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memset(&info, 0, sizeof(info));
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strlcpy(info.type, client_type, sizeof(info.type));
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info.addr = addr;
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return v4l2_i2c_new_subdev_board(v4l2_dev, adapter, &info, probe_addrs);
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev);
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/* Return i2c client address of v4l2_subdev. */
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unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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return client ? client->addr : I2C_CLIENT_END;
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_addr);
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/* Return a list of I2C tuner addresses to probe. Use only if the tuner
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addresses are unknown. */
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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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static const unsigned short radio_addrs[] = {
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#if IS_ENABLED(CONFIG_MEDIA_TUNER_TEA5761)
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0x10,
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#endif
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0x60,
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I2C_CLIENT_END
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};
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static const unsigned short demod_addrs[] = {
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0x42, 0x43, 0x4a, 0x4b,
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I2C_CLIENT_END
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};
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static const unsigned short tv_addrs[] = {
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0x42, 0x43, 0x4a, 0x4b, /* tda8290 */
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0x60, 0x61, 0x62, 0x63, 0x64,
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I2C_CLIENT_END
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};
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switch (type) {
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case ADDRS_RADIO:
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return radio_addrs;
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case ADDRS_DEMOD:
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return demod_addrs;
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case ADDRS_TV:
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return tv_addrs;
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case ADDRS_TV_WITH_DEMOD:
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return tv_addrs + 4;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(v4l2_i2c_tuner_addrs);
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#endif /* defined(CONFIG_I2C) */
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#if defined(CONFIG_SPI)
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/* Load an spi sub-device. */
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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_subdev_init(sd, ops);
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sd->flags |= V4L2_SUBDEV_FL_IS_SPI;
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/* the owner is the same as the spi_device's driver owner */
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sd->owner = spi->dev.driver->owner;
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sd->dev = &spi->dev;
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/* spi_device and v4l2_subdev point to one another */
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v4l2_set_subdevdata(sd, spi);
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spi_set_drvdata(spi, sd);
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/* initialize name */
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strlcpy(sd->name, spi->dev.driver->name, sizeof(sd->name));
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}
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EXPORT_SYMBOL_GPL(v4l2_spi_subdev_init);
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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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struct v4l2_subdev *sd = NULL;
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struct spi_device *spi = NULL;
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BUG_ON(!v4l2_dev);
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if (info->modalias[0])
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request_module(info->modalias);
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spi = spi_new_device(master, info);
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if (spi == NULL || spi->dev.driver == NULL)
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goto error;
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if (!try_module_get(spi->dev.driver->owner))
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goto error;
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sd = spi_get_drvdata(spi);
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/* Register with the v4l2_device which increases the module's
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use count as well. */
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if (v4l2_device_register_subdev(v4l2_dev, sd))
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sd = NULL;
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/* Decrease the module use count to match the first try_module_get. */
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module_put(spi->dev.driver->owner);
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error:
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/* If we have a client but no subdev, then something went wrong and
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we must unregister the client. */
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if (!sd)
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spi_unregister_device(spi);
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return sd;
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}
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EXPORT_SYMBOL_GPL(v4l2_spi_new_subdev);
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#endif /* defined(CONFIG_SPI) */
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/* Clamp x to be between min and max, aligned to a multiple of 2^align. min
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* and max don't have to be aligned, but there must be at least one valid
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* value. E.g., min=17,max=31,align=4 is not allowed as there are no multiples
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* of 16 between 17 and 31. */
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static unsigned int clamp_align(unsigned int x, unsigned int min,
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unsigned int max, unsigned int align)
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{
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/* Bits that must be zero to be aligned */
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unsigned int mask = ~((1 << align) - 1);
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/* Clamp to aligned min and max */
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x = clamp(x, (min + ~mask) & mask, max & mask);
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/* Round to nearest aligned value */
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if (align)
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x = (x + (1 << (align - 1))) & mask;
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return x;
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}
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/* Bound an image to have a width between wmin and wmax, and height between
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* hmin and hmax, inclusive. Additionally, the width will be a multiple of
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* 2^walign, the height will be a multiple of 2^halign, and the overall size
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* (width*height) will be a multiple of 2^salign. The image may be shrunk
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* or enlarged to fit the alignment constraints.
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*
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* The width or height maximum must not be smaller than the corresponding
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* minimum. The alignments must not be so high there are no possible image
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* sizes within the allowed bounds. wmin and hmin must be at least 1
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* (don't use 0). If you don't care about a certain alignment, specify 0,
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* as 2^0 is 1 and one byte alignment is equivalent to no alignment. If
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* you only want to adjust downward, specify a maximum that's the same as
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* the initial value.
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*/
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void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax,
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unsigned int walign,
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u32 *h, unsigned int hmin, unsigned int hmax,
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unsigned int halign, unsigned int salign)
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{
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*w = clamp_align(*w, wmin, wmax, walign);
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*h = clamp_align(*h, hmin, hmax, halign);
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/* Usually we don't need to align the size and are done now. */
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if (!salign)
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return;
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/* How much alignment do we have? */
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walign = __ffs(*w);
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halign = __ffs(*h);
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/* Enough to satisfy the image alignment? */
|
||
|
|
if (walign + halign < salign) {
|
||
|
|
/* Max walign where there is still a valid width */
|
||
|
|
unsigned int wmaxa = __fls(wmax ^ (wmin - 1));
|
||
|
|
/* Max halign where there is still a valid height */
|
||
|
|
unsigned int hmaxa = __fls(hmax ^ (hmin - 1));
|
||
|
|
|
||
|
|
/* up the smaller alignment until we have enough */
|
||
|
|
do {
|
||
|
|
if (halign >= hmaxa ||
|
||
|
|
(walign <= halign && walign < wmaxa)) {
|
||
|
|
*w = clamp_align(*w, wmin, wmax, walign + 1);
|
||
|
|
walign = __ffs(*w);
|
||
|
|
} else {
|
||
|
|
*h = clamp_align(*h, hmin, hmax, halign + 1);
|
||
|
|
halign = __ffs(*h);
|
||
|
|
}
|
||
|
|
} while (halign + walign < salign);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(v4l_bound_align_image);
|
||
|
|
|
||
|
|
const struct v4l2_frmsize_discrete *v4l2_find_nearest_format(
|
||
|
|
const struct v4l2_discrete_probe *probe,
|
||
|
|
s32 width, s32 height)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
u32 error, min_error = UINT_MAX;
|
||
|
|
const struct v4l2_frmsize_discrete *size, *best = NULL;
|
||
|
|
|
||
|
|
if (!probe)
|
||
|
|
return best;
|
||
|
|
|
||
|
|
for (i = 0, size = probe->sizes; i < probe->num_sizes; i++, size++) {
|
||
|
|
error = abs(size->width - width) + abs(size->height - height);
|
||
|
|
if (error < min_error) {
|
||
|
|
min_error = error;
|
||
|
|
best = size;
|
||
|
|
}
|
||
|
|
if (!error)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return best;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(v4l2_find_nearest_format);
|
||
|
|
|
||
|
|
void v4l2_get_timestamp(struct timeval *tv)
|
||
|
|
{
|
||
|
|
struct timespec ts;
|
||
|
|
|
||
|
|
ktime_get_ts(&ts);
|
||
|
|
tv->tv_sec = ts.tv_sec;
|
||
|
|
tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(v4l2_get_timestamp);
|