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staging: gasket: core: add platform device add and remove functions

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Add support for platform devices in the gasket framework.

Change-Id: I1e3625f9222b37925a2a672c9ea6eed31aefa35f
Signed-off-by: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Leonid Lobachev
2019-09-23 14:14:35 -07:00
parent 2a20ff1172
commit 35f51b913e
2 changed files with 98 additions and 1 deletions
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86
gasket_core.c
View File

@@ -24,6 +24,7 @@
#include <linux/init.h>
#include <linux/of.h>
#include <linux/pid_namespace.h>
#include <linux/platform_device.h>
#include <linux/printk.h>
#include <linux/sched.h>
@@ -668,6 +669,25 @@ lookup_pci_internal_desc(struct pci_dev *pci_dev)
return NULL;
}
/*
* Registered driver descriptor lookup for platform devices.
* Caller must hold g_mutex.
*/
static struct gasket_internal_desc *
lookup_platform_internal_desc(struct platform_device *pdev)
{
int i;
__must_hold(&g_mutex);
for (i = 0; i < GASKET_FRAMEWORK_DESC_MAX; i++) {
if (g_descs[i].driver_desc &&
strcmp(g_descs[i].driver_desc->name, pdev->name) == 0)
return &g_descs[i];
}
return NULL;
}
/*
* Verifies that the user has permissions to perform the requested mapping and
* that the provided descriptor/range is of adequate size to hold the range to
@@ -1557,6 +1577,72 @@ void gasket_pci_remove_device(struct pci_dev *pci_dev)
}
EXPORT_SYMBOL(gasket_pci_remove_device);
/* Add platform gasket device. Called by Gasket device probe function. */
int gasket_platform_add_device(struct platform_device *pdev,
struct gasket_dev **gasket_devp)
{
int ret;
struct gasket_internal_desc *internal_desc;
struct gasket_dev *gasket_dev;
struct device *parent;
dev_dbg(&pdev->dev, "add platform gasket device\n");
mutex_lock(&g_mutex);
internal_desc = lookup_platform_internal_desc(pdev);
mutex_unlock(&g_mutex);
if (!internal_desc) {
dev_err(&pdev->dev,
"%s called for unknown driver type\n", __func__);
return -ENODEV;
}
parent = &pdev->dev;
ret = __gasket_add_device(parent, internal_desc, &gasket_dev);
if (ret)
return ret;
gasket_dev->platform_dev = pdev;
*gasket_devp = gasket_dev;
return 0;
}
EXPORT_SYMBOL(gasket_platform_add_device);
/* Remove a platform gasket device. */
void gasket_platform_remove_device(struct platform_device *pdev)
{
int i;
struct gasket_internal_desc *internal_desc;
struct gasket_dev *gasket_dev = NULL;
/* Find the device desc. */
mutex_lock(&g_mutex);
internal_desc = lookup_platform_internal_desc(pdev);
mutex_unlock(&g_mutex);
if (!internal_desc)
return;
/* Now find the specific device */
mutex_lock(&internal_desc->mutex);
for (i = 0; i < GASKET_DEV_MAX; i++) {
if (internal_desc->devs[i] &&
internal_desc->devs[i]->platform_dev == pdev) {
gasket_dev = internal_desc->devs[i];
break;
}
}
mutex_unlock(&internal_desc->mutex);
if (!gasket_dev)
return;
dev_dbg(gasket_dev->dev, "remove %s platform gasket device\n",
internal_desc->driver_desc->name);
__gasket_remove_device(internal_desc, gasket_dev);
}
EXPORT_SYMBOL(gasket_platform_remove_device);
/**
* Lookup a name by number in a num_name table.
* @num: Number to lookup.

13
gasket_core.h
View File

@@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
@@ -265,9 +266,12 @@ struct gasket_dev {
/* Device info */
struct device *dev;
/* PCI subsystem metadata. */
/* PCI device pointer for PCI devices */
struct pci_dev *pci_dev;
/* Platform device pointer for platform devices */
struct platform_device *platform_dev;
/* This device's index into internal_desc->devs. */
int dev_idx;
@@ -539,6 +543,13 @@ int gasket_pci_add_device(struct pci_dev *pci_dev,
/* Remove a PCI gasket device. */
void gasket_pci_remove_device(struct pci_dev *pci_dev);
/* Add a platform gasket device. */
int gasket_platform_add_device(struct platform_device *pdev,
struct gasket_dev **gasket_devp);
/* Remove a platform gasket device. */
void gasket_platform_remove_device(struct platform_device *pdev);
/* Enable a Gasket device. */
int gasket_enable_device(struct gasket_dev *gasket_dev);