blob: de312283918278a24038e2352cc0ce030a4b3b22 [file] [log] [blame]
/*
* Copyright 2012-2013 Luis R. Rodriguez <mcgrof@do-not-panic.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Backport functionality introduced in Linux 3.5.
*/
#include <linux/module.h>
#include <linux/highuid.h>
#include <linux/ktime.h>
#include <linux/hrtimer.h>
#include <linux/gpio.h>
#include <linux/ptp_clock_kernel.h>
#if LINUX_VERSION_IS_GEQ(3,2,0)
#include <linux/device.h>
/**
* devres_release - Find a device resource and destroy it, calling release
* @dev: Device to find resource from
* @release: Look for resources associated with this release function
* @match: Match function (optional)
* @match_data: Data for the match function
*
* Find the latest devres of @dev associated with @release and for
* which @match returns 1. If @match is NULL, it's considered to
* match all. If found, the resource is removed atomically, the
* release function called and the resource freed.
*
* RETURNS:
* 0 if devres is found and freed, -ENOENT if not found.
*/
int devres_release(struct device *dev, dr_release_t release,
dr_match_t match, void *match_data)
{
void *res;
res = devres_remove(dev, release, match, match_data);
if (unlikely(!res))
return -ENOENT;
(*release)(dev, res);
devres_free(res);
return 0;
}
EXPORT_SYMBOL_GPL(devres_release);
#endif /* LINUX_VERSION_IS_GEQ(3,2,0) */
/*
* Commit 7a4e7408c5cadb240e068a662251754a562355e3
* exported overflowuid and overflowgid for all
* kernel configurations, prior to that we only
* had it exported when CONFIG_UID16 was enabled.
* We are technically redefining it here but
* nothing seems to be changing it, except
* kernel/ code does epose it via sysctl and
* proc... if required later we can add that here.
*/
#ifndef CONFIG_UID16
int overflowuid = DEFAULT_OVERFLOWUID;
int overflowgid = DEFAULT_OVERFLOWGID;
EXPORT_SYMBOL_GPL(overflowuid);
EXPORT_SYMBOL_GPL(overflowgid);
#endif
#if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
int ptp_clock_index(struct ptp_clock *ptp)
{
return ptp->index;
}
EXPORT_SYMBOL(ptp_clock_index);
#endif /* CONFIG_PTP_1588_CLOCK */
#ifdef CONFIG_GPIOLIB
static void devm_gpio_release(struct device *dev, void *res)
{
unsigned *gpio = res;
gpio_free(*gpio);
}
/**
* devm_gpio_request - request a GPIO for a managed device
* @dev: device to request the GPIO for
* @gpio: GPIO to allocate
* @label: the name of the requested GPIO
*
* Except for the extra @dev argument, this function takes the
* same arguments and performs the same function as
* gpio_request(). GPIOs requested with this function will be
* automatically freed on driver detach.
*
* If an GPIO allocated with this function needs to be freed
* separately, devm_gpio_free() must be used.
*/
int devm_gpio_request(struct device *dev, unsigned gpio, const char *label)
{
unsigned *dr;
int rc;
dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
if (!dr)
return -ENOMEM;
rc = gpio_request(gpio, label);
if (rc) {
devres_free(dr);
return rc;
}
*dr = gpio;
devres_add(dev, dr);
return 0;
}
EXPORT_SYMBOL_GPL(devm_gpio_request);
/**
* devm_gpio_request_one - request a single GPIO with initial setup
* @dev: device to request for
* @gpio: the GPIO number
* @flags: GPIO configuration as specified by GPIOF_*
* @label: a literal description string of this GPIO
*/
int devm_gpio_request_one(struct device *dev, unsigned gpio,
unsigned long flags, const char *label)
{
unsigned *dr;
int rc;
dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
if (!dr)
return -ENOMEM;
rc = gpio_request_one(gpio, flags, label);
if (rc) {
devres_free(dr);
return rc;
}
*dr = gpio;
devres_add(dev, dr);
return 0;
}
EXPORT_SYMBOL_GPL(devm_gpio_request_one);
static int devm_gpio_match(struct device *dev, void *res, void *data)
{
unsigned *this = res, *gpio = data;
return *this == *gpio;
}
void devm_gpio_free(struct device *dev, unsigned int gpio)
{
WARN_ON(devres_destroy(dev, devm_gpio_release, devm_gpio_match,
&gpio));
gpio_free(gpio);
}
EXPORT_SYMBOL_GPL(devm_gpio_free);
#endif /* CONFIG_GPIOLIB */