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platform/x86: intel_scu_ipc: Add managed function to register SCU IPC

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Drivers such as intel_pmc_ipc.c can be unloaded as well so in order to
support those in this driver add a new function that can be called to
unregister the SCU IPC when it is not needed anymore.

We also add a managed version of the intel_scu_ipc_register() that takes
care of calling intel_scu_ipc_unregister() automatically when the driver
is unbound.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Mika Westerberg 2020-04-16 11:15:40 +03:00 committed by Lee Jones
parent 663cc18861
commit 7e18c89d6e
2 changed files with 72 additions and 0 deletions
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10
arch/x86/include/asm/intel_scu_ipc.h
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@ -25,6 +25,16 @@ __intel_scu_ipc_register(struct device *parent,
#define intel_scu_ipc_register(parent, scu_data) \
__intel_scu_ipc_register(parent, scu_data, THIS_MODULE)
void intel_scu_ipc_unregister(struct intel_scu_ipc_dev *scu);
struct intel_scu_ipc_dev *
__devm_intel_scu_ipc_register(struct device *parent,
const struct intel_scu_ipc_data *scu_data,
struct module *owner);
#define devm_intel_scu_ipc_register(parent, scu_data) \
__devm_intel_scu_ipc_register(parent, scu_data, THIS_MODULE)
struct intel_scu_ipc_dev *intel_scu_ipc_dev_get(void);
void intel_scu_ipc_dev_put(struct intel_scu_ipc_dev *scu);
struct intel_scu_ipc_dev *devm_intel_scu_ipc_dev_get(struct device *dev);

62
drivers/platform/x86/intel_scu_ipc.c
View File

@ -637,6 +637,68 @@ __intel_scu_ipc_register(struct device *parent,
}
EXPORT_SYMBOL_GPL(__intel_scu_ipc_register);
/**
* intel_scu_ipc_unregister() - Unregister SCU IPC
* @scu: SCU IPC handle
*
* This unregisters the SCU IPC device and releases the acquired
* resources once the refcount goes to zero.
*/
void intel_scu_ipc_unregister(struct intel_scu_ipc_dev *scu)
{
mutex_lock(&ipclock);
if (!WARN_ON(!ipcdev)) {
ipcdev = NULL;
device_unregister(&scu->dev);
}
mutex_unlock(&ipclock);
}
EXPORT_SYMBOL_GPL(intel_scu_ipc_unregister);
static void devm_intel_scu_ipc_unregister(struct device *dev, void *res)
{
struct intel_scu_ipc_devres *dr = res;
struct intel_scu_ipc_dev *scu = dr->scu;
intel_scu_ipc_unregister(scu);
}
/**
* __devm_intel_scu_ipc_register() - Register managed SCU IPC device
* @parent: Parent device
* @scu_data: Data used to configure SCU IPC
* @owner: Module registering the SCU IPC device
*
* Call this function to register managed SCU IPC mechanism under
* @parent. Returns pointer to the new SCU IPC device or ERR_PTR() in
* case of failure. The caller may use the returned instance if it needs
* to do SCU IPC calls itself.
*/
struct intel_scu_ipc_dev *
__devm_intel_scu_ipc_register(struct device *parent,
const struct intel_scu_ipc_data *scu_data,
struct module *owner)
{
struct intel_scu_ipc_devres *dr;
struct intel_scu_ipc_dev *scu;
dr = devres_alloc(devm_intel_scu_ipc_unregister, sizeof(*dr), GFP_KERNEL);
if (!dr)
return NULL;
scu = __intel_scu_ipc_register(parent, scu_data, owner);
if (IS_ERR(scu)) {
devres_free(dr);
return scu;
}
dr->scu = scu;
devres_add(parent, dr);
return scu;
}
EXPORT_SYMBOL_GPL(__devm_intel_scu_ipc_register);
static int __init intel_scu_ipc_init(void)
{
return class_register(&intel_scu_ipc_class);