![David Howells](/assets/img/avatar_default.png)
Remove all #inclusions of asm/system.h preparatory to splitting and killing it. Performed with the following command: perl -p -i -e 's!^#\s*include\s*<asm/system[.]h>.*\n!!' `grep -Irl '^#\s*include\s*<asm/system[.]h>' *` Signed-off-by: David Howells <dhowells@redhat.com>
624 lines
18 KiB
C
624 lines
18 KiB
C
/*
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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 <media/v4l2-chip-ident.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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/* Check for correctness of the ctrl's value based on the data from
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struct v4l2_queryctrl and the available menu items. Note that
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menu_items may be NULL, in that case it is ignored. */
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int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
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const char * const *menu_items)
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{
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if (qctrl->flags & V4L2_CTRL_FLAG_DISABLED)
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return -EINVAL;
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if (qctrl->flags & V4L2_CTRL_FLAG_GRABBED)
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return -EBUSY;
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if (qctrl->type == V4L2_CTRL_TYPE_STRING)
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return 0;
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if (qctrl->type == V4L2_CTRL_TYPE_BUTTON ||
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qctrl->type == V4L2_CTRL_TYPE_INTEGER64 ||
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qctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
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return 0;
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if (ctrl->value < qctrl->minimum || ctrl->value > qctrl->maximum)
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return -ERANGE;
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if (qctrl->type == V4L2_CTRL_TYPE_MENU && menu_items != NULL) {
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if (menu_items[ctrl->value] == NULL ||
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menu_items[ctrl->value][0] == '\0')
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return -EINVAL;
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}
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if (qctrl->type == V4L2_CTRL_TYPE_BITMASK &&
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(ctrl->value & ~qctrl->maximum))
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return -ERANGE;
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return 0;
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}
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EXPORT_SYMBOL(v4l2_ctrl_check);
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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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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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/* Fill in a struct v4l2_querymenu based on the struct v4l2_queryctrl and
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the menu. The qctrl pointer may be NULL, in which case it is ignored.
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If menu_items is NULL, then the menu items are retrieved using
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v4l2_ctrl_get_menu. */
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int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu, struct v4l2_queryctrl *qctrl,
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const char * const *menu_items)
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{
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int i;
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qmenu->reserved = 0;
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if (menu_items == NULL)
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menu_items = v4l2_ctrl_get_menu(qmenu->id);
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if (menu_items == NULL ||
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(qctrl && (qmenu->index < qctrl->minimum || qmenu->index > qctrl->maximum)))
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return -EINVAL;
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for (i = 0; i < qmenu->index && menu_items[i]; i++) ;
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if (menu_items[i] == NULL || menu_items[i][0] == '\0')
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return -EINVAL;
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strlcpy(qmenu->name, menu_items[qmenu->index], sizeof(qmenu->name));
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return 0;
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}
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EXPORT_SYMBOL(v4l2_ctrl_query_menu);
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/* Fill in a struct v4l2_querymenu based on the specified array of valid
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menu items (terminated by V4L2_CTRL_MENU_IDS_END).
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Use this if there are 'holes' in the list of valid menu items. */
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int v4l2_ctrl_query_menu_valid_items(struct v4l2_querymenu *qmenu, const u32 *ids)
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{
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const char * const *menu_items = v4l2_ctrl_get_menu(qmenu->id);
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qmenu->reserved = 0;
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if (menu_items == NULL || ids == NULL)
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return -EINVAL;
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while (*ids != V4L2_CTRL_MENU_IDS_END) {
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if (*ids++ == qmenu->index) {
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strlcpy(qmenu->name, menu_items[qmenu->index],
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sizeof(qmenu->name));
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return 0;
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}
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL(v4l2_ctrl_query_menu_valid_items);
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/* ctrl_classes points to an array of u32 pointers, the last element is
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a NULL pointer. Each u32 array is a 0-terminated array of control IDs.
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Each array must be sorted low to high and belong to the same control
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class. The array of u32 pointers must also be sorted, from low class IDs
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to high class IDs.
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This function returns the first ID that follows after the given ID.
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When no more controls are available 0 is returned. */
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u32 v4l2_ctrl_next(const u32 * const * ctrl_classes, u32 id)
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{
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u32 ctrl_class = V4L2_CTRL_ID2CLASS(id);
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const u32 *pctrl;
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if (ctrl_classes == NULL)
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return 0;
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/* if no query is desired, then check if the ID is part of ctrl_classes */
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if ((id & V4L2_CTRL_FLAG_NEXT_CTRL) == 0) {
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/* find class */
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while (*ctrl_classes && V4L2_CTRL_ID2CLASS(**ctrl_classes) != ctrl_class)
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ctrl_classes++;
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if (*ctrl_classes == NULL)
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return 0;
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pctrl = *ctrl_classes;
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/* find control ID */
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while (*pctrl && *pctrl != id) pctrl++;
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return *pctrl ? id : 0;
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}
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id &= V4L2_CTRL_ID_MASK;
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id++; /* select next control */
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/* find first class that matches (or is greater than) the class of
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the ID */
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while (*ctrl_classes && V4L2_CTRL_ID2CLASS(**ctrl_classes) < ctrl_class)
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ctrl_classes++;
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/* no more classes */
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if (*ctrl_classes == NULL)
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return 0;
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pctrl = *ctrl_classes;
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/* find first ctrl within the class that is >= ID */
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while (*pctrl && *pctrl < id) pctrl++;
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if (*pctrl)
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return *pctrl;
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/* we are at the end of the controls of the current class. */
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/* continue with next class if available */
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ctrl_classes++;
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if (*ctrl_classes == NULL)
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return 0;
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return **ctrl_classes;
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}
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EXPORT_SYMBOL(v4l2_ctrl_next);
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int v4l2_chip_match_host(const struct v4l2_dbg_match *match)
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{
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switch (match->type) {
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case V4L2_CHIP_MATCH_HOST:
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return match->addr == 0;
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default:
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return 0;
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}
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}
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EXPORT_SYMBOL(v4l2_chip_match_host);
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#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
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int v4l2_chip_match_i2c_client(struct i2c_client *c, const struct v4l2_dbg_match *match)
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{
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int len;
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if (c == NULL || match == NULL)
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return 0;
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switch (match->type) {
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case V4L2_CHIP_MATCH_I2C_DRIVER:
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if (c->driver == NULL || c->driver->driver.name == NULL)
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return 0;
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len = strlen(c->driver->driver.name);
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/* legacy drivers have a ' suffix, don't try to match that */
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if (len && c->driver->driver.name[len - 1] == '\'')
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len--;
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return len && !strncmp(c->driver->driver.name, match->name, len);
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case V4L2_CHIP_MATCH_I2C_ADDR:
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return c->addr == match->addr;
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default:
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return 0;
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}
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}
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EXPORT_SYMBOL(v4l2_chip_match_i2c_client);
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int v4l2_chip_ident_i2c_client(struct i2c_client *c, struct v4l2_dbg_chip_ident *chip,
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u32 ident, u32 revision)
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{
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if (!v4l2_chip_match_i2c_client(c, &chip->match))
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return 0;
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if (chip->ident == V4L2_IDENT_NONE) {
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chip->ident = ident;
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chip->revision = revision;
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}
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else {
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chip->ident = V4L2_IDENT_AMBIGUOUS;
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chip->revision = 0;
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}
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return 0;
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}
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EXPORT_SYMBOL(v4l2_chip_ident_i2c_client);
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/* ----------------------------------------------------------------- */
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/* I2C Helper functions */
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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->driver->driver.owner;
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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->driver->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->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->driver->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->driver->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 defined(CONFIG_MEDIA_TUNER_TEA5761) || defined(CONFIG_MEDIA_TUNER_TEA5761_MODULE)
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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 a 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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/* 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)
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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))
|
|
sd = NULL;
|
|
|
|
/* Decrease the module use count to match the first try_module_get. */
|
|
module_put(spi->dev.driver->owner);
|
|
|
|
error:
|
|
/* If we have a client but no subdev, then something went wrong and
|
|
we must unregister the client. */
|
|
if (spi && sd == NULL)
|
|
spi_unregister_device(spi);
|
|
|
|
return sd;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_spi_new_subdev);
|
|
|
|
#endif /* defined(CONFIG_SPI) */
|
|
|
|
/* Clamp x to be between min and max, aligned to a multiple of 2^align. min
|
|
* and max don't have to be aligned, but there must be at least one valid
|
|
* value. E.g., min=17,max=31,align=4 is not allowed as there are no multiples
|
|
* of 16 between 17 and 31. */
|
|
static unsigned int clamp_align(unsigned int x, unsigned int min,
|
|
unsigned int max, unsigned int align)
|
|
{
|
|
/* Bits that must be zero to be aligned */
|
|
unsigned int mask = ~((1 << align) - 1);
|
|
|
|
/* Round to nearest aligned value */
|
|
if (align)
|
|
x = (x + (1 << (align - 1))) & mask;
|
|
|
|
/* Clamp to aligned value of min and max */
|
|
if (x < min)
|
|
x = (min + ~mask) & mask;
|
|
else if (x > max)
|
|
x = max & mask;
|
|
|
|
return x;
|
|
}
|
|
|
|
/* Bound an image to have a width between wmin and wmax, and height between
|
|
* hmin and hmax, inclusive. Additionally, the width will be a multiple of
|
|
* 2^walign, the height will be a multiple of 2^halign, and the overall size
|
|
* (width*height) will be a multiple of 2^salign. The image may be shrunk
|
|
* or enlarged to fit the alignment constraints.
|
|
*
|
|
* The width or height maximum must not be smaller than the corresponding
|
|
* minimum. The alignments must not be so high there are no possible image
|
|
* sizes within the allowed bounds. wmin and hmin must be at least 1
|
|
* (don't use 0). If you don't care about a certain alignment, specify 0,
|
|
* as 2^0 is 1 and one byte alignment is equivalent to no alignment. If
|
|
* you only want to adjust downward, specify a maximum that's the same as
|
|
* the initial value.
|
|
*/
|
|
void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax,
|
|
unsigned int walign,
|
|
u32 *h, unsigned int hmin, unsigned int hmax,
|
|
unsigned int halign, unsigned int salign)
|
|
{
|
|
*w = clamp_align(*w, wmin, wmax, walign);
|
|
*h = clamp_align(*h, hmin, hmax, halign);
|
|
|
|
/* Usually we don't need to align the size and are done now. */
|
|
if (!salign)
|
|
return;
|
|
|
|
/* How much alignment do we have? */
|
|
walign = __ffs(*w);
|
|
halign = __ffs(*h);
|
|
/* 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);
|
|
|
|
/**
|
|
* v4l_fill_dv_preset_info - fill description of a digital video preset
|
|
* @preset - preset value
|
|
* @info - pointer to struct v4l2_dv_enum_preset
|
|
*
|
|
* drivers can use this helper function to fill description of dv preset
|
|
* in info.
|
|
*/
|
|
int v4l_fill_dv_preset_info(u32 preset, struct v4l2_dv_enum_preset *info)
|
|
{
|
|
static const struct v4l2_dv_preset_info {
|
|
u16 width;
|
|
u16 height;
|
|
const char *name;
|
|
} dv_presets[] = {
|
|
{ 0, 0, "Invalid" }, /* V4L2_DV_INVALID */
|
|
{ 720, 480, "480p@59.94" }, /* V4L2_DV_480P59_94 */
|
|
{ 720, 576, "576p@50" }, /* V4L2_DV_576P50 */
|
|
{ 1280, 720, "720p@24" }, /* V4L2_DV_720P24 */
|
|
{ 1280, 720, "720p@25" }, /* V4L2_DV_720P25 */
|
|
{ 1280, 720, "720p@30" }, /* V4L2_DV_720P30 */
|
|
{ 1280, 720, "720p@50" }, /* V4L2_DV_720P50 */
|
|
{ 1280, 720, "720p@59.94" }, /* V4L2_DV_720P59_94 */
|
|
{ 1280, 720, "720p@60" }, /* V4L2_DV_720P60 */
|
|
{ 1920, 1080, "1080i@29.97" }, /* V4L2_DV_1080I29_97 */
|
|
{ 1920, 1080, "1080i@30" }, /* V4L2_DV_1080I30 */
|
|
{ 1920, 1080, "1080i@25" }, /* V4L2_DV_1080I25 */
|
|
{ 1920, 1080, "1080i@50" }, /* V4L2_DV_1080I50 */
|
|
{ 1920, 1080, "1080i@60" }, /* V4L2_DV_1080I60 */
|
|
{ 1920, 1080, "1080p@24" }, /* V4L2_DV_1080P24 */
|
|
{ 1920, 1080, "1080p@25" }, /* V4L2_DV_1080P25 */
|
|
{ 1920, 1080, "1080p@30" }, /* V4L2_DV_1080P30 */
|
|
{ 1920, 1080, "1080p@50" }, /* V4L2_DV_1080P50 */
|
|
{ 1920, 1080, "1080p@60" }, /* V4L2_DV_1080P60 */
|
|
};
|
|
|
|
if (info == NULL || preset >= ARRAY_SIZE(dv_presets))
|
|
return -EINVAL;
|
|
|
|
info->preset = preset;
|
|
info->width = dv_presets[preset].width;
|
|
info->height = dv_presets[preset].height;
|
|
strlcpy(info->name, dv_presets[preset].name, sizeof(info->name));
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l_fill_dv_preset_info);
|
|
|
|
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);
|