424 lines
16 KiB
C
424 lines
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Surface System Aggregator Module (SSAM) bus and client-device subsystem.
|
|
*
|
|
* Main interface for the surface-aggregator bus, surface-aggregator client
|
|
* devices, and respective drivers building on top of the SSAM controller.
|
|
* Provides support for non-platform/non-ACPI SSAM clients via dedicated
|
|
* subsystem.
|
|
*
|
|
* Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com>
|
|
*/
|
|
|
|
#ifndef _LINUX_SURFACE_AGGREGATOR_DEVICE_H
|
|
#define _LINUX_SURFACE_AGGREGATOR_DEVICE_H
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/surface_aggregator/controller.h>
|
|
|
|
|
|
/* -- Surface System Aggregator Module bus. --------------------------------- */
|
|
|
|
/**
|
|
* enum ssam_device_domain - SAM device domain.
|
|
* @SSAM_DOMAIN_VIRTUAL: Virtual device.
|
|
* @SSAM_DOMAIN_SERIALHUB: Physical device connected via Surface Serial Hub.
|
|
*/
|
|
enum ssam_device_domain {
|
|
SSAM_DOMAIN_VIRTUAL = 0x00,
|
|
SSAM_DOMAIN_SERIALHUB = 0x01,
|
|
};
|
|
|
|
/**
|
|
* enum ssam_virtual_tc - Target categories for the virtual SAM domain.
|
|
* @SSAM_VIRTUAL_TC_HUB: Device hub category.
|
|
*/
|
|
enum ssam_virtual_tc {
|
|
SSAM_VIRTUAL_TC_HUB = 0x00,
|
|
};
|
|
|
|
/**
|
|
* struct ssam_device_uid - Unique identifier for SSAM device.
|
|
* @domain: Domain of the device.
|
|
* @category: Target category of the device.
|
|
* @target: Target ID of the device.
|
|
* @instance: Instance ID of the device.
|
|
* @function: Sub-function of the device. This field can be used to split a
|
|
* single SAM device into multiple virtual subdevices to separate
|
|
* different functionality of that device and allow one driver per
|
|
* such functionality.
|
|
*/
|
|
struct ssam_device_uid {
|
|
u8 domain;
|
|
u8 category;
|
|
u8 target;
|
|
u8 instance;
|
|
u8 function;
|
|
};
|
|
|
|
/*
|
|
* Special values for device matching.
|
|
*
|
|
* These values are intended to be used with SSAM_DEVICE(), SSAM_VDEV(), and
|
|
* SSAM_SDEV() exclusively. Specifically, they are used to initialize the
|
|
* match_flags member of the device ID structure. Do not use them directly
|
|
* with struct ssam_device_id or struct ssam_device_uid.
|
|
*/
|
|
#define SSAM_ANY_TID 0xffff
|
|
#define SSAM_ANY_IID 0xffff
|
|
#define SSAM_ANY_FUN 0xffff
|
|
|
|
/**
|
|
* SSAM_DEVICE() - Initialize a &struct ssam_device_id with the given
|
|
* parameters.
|
|
* @d: Domain of the device.
|
|
* @cat: Target category of the device.
|
|
* @tid: Target ID of the device.
|
|
* @iid: Instance ID of the device.
|
|
* @fun: Sub-function of the device.
|
|
*
|
|
* Initializes a &struct ssam_device_id with the given parameters. See &struct
|
|
* ssam_device_uid for details regarding the parameters. The special values
|
|
* %SSAM_ANY_TID, %SSAM_ANY_IID, and %SSAM_ANY_FUN can be used to specify that
|
|
* matching should ignore target ID, instance ID, and/or sub-function,
|
|
* respectively. This macro initializes the ``match_flags`` field based on the
|
|
* given parameters.
|
|
*
|
|
* Note: The parameters @d and @cat must be valid &u8 values, the parameters
|
|
* @tid, @iid, and @fun must be either valid &u8 values or %SSAM_ANY_TID,
|
|
* %SSAM_ANY_IID, or %SSAM_ANY_FUN, respectively. Other non-&u8 values are not
|
|
* allowed.
|
|
*/
|
|
#define SSAM_DEVICE(d, cat, tid, iid, fun) \
|
|
.match_flags = (((tid) != SSAM_ANY_TID) ? SSAM_MATCH_TARGET : 0) \
|
|
| (((iid) != SSAM_ANY_IID) ? SSAM_MATCH_INSTANCE : 0) \
|
|
| (((fun) != SSAM_ANY_FUN) ? SSAM_MATCH_FUNCTION : 0), \
|
|
.domain = d, \
|
|
.category = cat, \
|
|
.target = ((tid) != SSAM_ANY_TID) ? (tid) : 0, \
|
|
.instance = ((iid) != SSAM_ANY_IID) ? (iid) : 0, \
|
|
.function = ((fun) != SSAM_ANY_FUN) ? (fun) : 0 \
|
|
|
|
/**
|
|
* SSAM_VDEV() - Initialize a &struct ssam_device_id as virtual device with
|
|
* the given parameters.
|
|
* @cat: Target category of the device.
|
|
* @tid: Target ID of the device.
|
|
* @iid: Instance ID of the device.
|
|
* @fun: Sub-function of the device.
|
|
*
|
|
* Initializes a &struct ssam_device_id with the given parameters in the
|
|
* virtual domain. See &struct ssam_device_uid for details regarding the
|
|
* parameters. The special values %SSAM_ANY_TID, %SSAM_ANY_IID, and
|
|
* %SSAM_ANY_FUN can be used to specify that matching should ignore target ID,
|
|
* instance ID, and/or sub-function, respectively. This macro initializes the
|
|
* ``match_flags`` field based on the given parameters.
|
|
*
|
|
* Note: The parameter @cat must be a valid &u8 value, the parameters @tid,
|
|
* @iid, and @fun must be either valid &u8 values or %SSAM_ANY_TID,
|
|
* %SSAM_ANY_IID, or %SSAM_ANY_FUN, respectively. Other non-&u8 values are not
|
|
* allowed.
|
|
*/
|
|
#define SSAM_VDEV(cat, tid, iid, fun) \
|
|
SSAM_DEVICE(SSAM_DOMAIN_VIRTUAL, SSAM_VIRTUAL_TC_##cat, tid, iid, fun)
|
|
|
|
/**
|
|
* SSAM_SDEV() - Initialize a &struct ssam_device_id as physical SSH device
|
|
* with the given parameters.
|
|
* @cat: Target category of the device.
|
|
* @tid: Target ID of the device.
|
|
* @iid: Instance ID of the device.
|
|
* @fun: Sub-function of the device.
|
|
*
|
|
* Initializes a &struct ssam_device_id with the given parameters in the SSH
|
|
* domain. See &struct ssam_device_uid for details regarding the parameters.
|
|
* The special values %SSAM_ANY_TID, %SSAM_ANY_IID, and %SSAM_ANY_FUN can be
|
|
* used to specify that matching should ignore target ID, instance ID, and/or
|
|
* sub-function, respectively. This macro initializes the ``match_flags``
|
|
* field based on the given parameters.
|
|
*
|
|
* Note: The parameter @cat must be a valid &u8 value, the parameters @tid,
|
|
* @iid, and @fun must be either valid &u8 values or %SSAM_ANY_TID,
|
|
* %SSAM_ANY_IID, or %SSAM_ANY_FUN, respectively. Other non-&u8 values are not
|
|
* allowed.
|
|
*/
|
|
#define SSAM_SDEV(cat, tid, iid, fun) \
|
|
SSAM_DEVICE(SSAM_DOMAIN_SERIALHUB, SSAM_SSH_TC_##cat, tid, iid, fun)
|
|
|
|
/**
|
|
* struct ssam_device - SSAM client device.
|
|
* @dev: Driver model representation of the device.
|
|
* @ctrl: SSAM controller managing this device.
|
|
* @uid: UID identifying the device.
|
|
*/
|
|
struct ssam_device {
|
|
struct device dev;
|
|
struct ssam_controller *ctrl;
|
|
|
|
struct ssam_device_uid uid;
|
|
};
|
|
|
|
/**
|
|
* struct ssam_device_driver - SSAM client device driver.
|
|
* @driver: Base driver model structure.
|
|
* @match_table: Match table specifying which devices the driver should bind to.
|
|
* @probe: Called when the driver is being bound to a device.
|
|
* @remove: Called when the driver is being unbound from the device.
|
|
*/
|
|
struct ssam_device_driver {
|
|
struct device_driver driver;
|
|
|
|
const struct ssam_device_id *match_table;
|
|
|
|
int (*probe)(struct ssam_device *sdev);
|
|
void (*remove)(struct ssam_device *sdev);
|
|
};
|
|
|
|
extern struct bus_type ssam_bus_type;
|
|
extern const struct device_type ssam_device_type;
|
|
|
|
/**
|
|
* is_ssam_device() - Check if the given device is a SSAM client device.
|
|
* @d: The device to test the type of.
|
|
*
|
|
* Return: Returns %true if the specified device is of type &struct
|
|
* ssam_device, i.e. the device type points to %ssam_device_type, and %false
|
|
* otherwise.
|
|
*/
|
|
static inline bool is_ssam_device(struct device *d)
|
|
{
|
|
return d->type == &ssam_device_type;
|
|
}
|
|
|
|
/**
|
|
* to_ssam_device() - Casts the given device to a SSAM client device.
|
|
* @d: The device to cast.
|
|
*
|
|
* Casts the given &struct device to a &struct ssam_device. The caller has to
|
|
* ensure that the given device is actually enclosed in a &struct ssam_device,
|
|
* e.g. by calling is_ssam_device().
|
|
*
|
|
* Return: Returns a pointer to the &struct ssam_device wrapping the given
|
|
* device @d.
|
|
*/
|
|
static inline struct ssam_device *to_ssam_device(struct device *d)
|
|
{
|
|
return container_of(d, struct ssam_device, dev);
|
|
}
|
|
|
|
/**
|
|
* to_ssam_device_driver() - Casts the given device driver to a SSAM client
|
|
* device driver.
|
|
* @d: The driver to cast.
|
|
*
|
|
* Casts the given &struct device_driver to a &struct ssam_device_driver. The
|
|
* caller has to ensure that the given driver is actually enclosed in a
|
|
* &struct ssam_device_driver.
|
|
*
|
|
* Return: Returns the pointer to the &struct ssam_device_driver wrapping the
|
|
* given device driver @d.
|
|
*/
|
|
static inline
|
|
struct ssam_device_driver *to_ssam_device_driver(struct device_driver *d)
|
|
{
|
|
return container_of(d, struct ssam_device_driver, driver);
|
|
}
|
|
|
|
const struct ssam_device_id *ssam_device_id_match(const struct ssam_device_id *table,
|
|
const struct ssam_device_uid uid);
|
|
|
|
const struct ssam_device_id *ssam_device_get_match(const struct ssam_device *dev);
|
|
|
|
const void *ssam_device_get_match_data(const struct ssam_device *dev);
|
|
|
|
struct ssam_device *ssam_device_alloc(struct ssam_controller *ctrl,
|
|
struct ssam_device_uid uid);
|
|
|
|
int ssam_device_add(struct ssam_device *sdev);
|
|
void ssam_device_remove(struct ssam_device *sdev);
|
|
|
|
/**
|
|
* ssam_device_get() - Increment reference count of SSAM client device.
|
|
* @sdev: The device to increment the reference count of.
|
|
*
|
|
* Increments the reference count of the given SSAM client device by
|
|
* incrementing the reference count of the enclosed &struct device via
|
|
* get_device().
|
|
*
|
|
* See ssam_device_put() for the counter-part of this function.
|
|
*
|
|
* Return: Returns the device provided as input.
|
|
*/
|
|
static inline struct ssam_device *ssam_device_get(struct ssam_device *sdev)
|
|
{
|
|
return sdev ? to_ssam_device(get_device(&sdev->dev)) : NULL;
|
|
}
|
|
|
|
/**
|
|
* ssam_device_put() - Decrement reference count of SSAM client device.
|
|
* @sdev: The device to decrement the reference count of.
|
|
*
|
|
* Decrements the reference count of the given SSAM client device by
|
|
* decrementing the reference count of the enclosed &struct device via
|
|
* put_device().
|
|
*
|
|
* See ssam_device_get() for the counter-part of this function.
|
|
*/
|
|
static inline void ssam_device_put(struct ssam_device *sdev)
|
|
{
|
|
if (sdev)
|
|
put_device(&sdev->dev);
|
|
}
|
|
|
|
/**
|
|
* ssam_device_get_drvdata() - Get driver-data of SSAM client device.
|
|
* @sdev: The device to get the driver-data from.
|
|
*
|
|
* Return: Returns the driver-data of the given device, previously set via
|
|
* ssam_device_set_drvdata().
|
|
*/
|
|
static inline void *ssam_device_get_drvdata(struct ssam_device *sdev)
|
|
{
|
|
return dev_get_drvdata(&sdev->dev);
|
|
}
|
|
|
|
/**
|
|
* ssam_device_set_drvdata() - Set driver-data of SSAM client device.
|
|
* @sdev: The device to set the driver-data of.
|
|
* @data: The data to set the device's driver-data pointer to.
|
|
*/
|
|
static inline void ssam_device_set_drvdata(struct ssam_device *sdev, void *data)
|
|
{
|
|
dev_set_drvdata(&sdev->dev, data);
|
|
}
|
|
|
|
int __ssam_device_driver_register(struct ssam_device_driver *d, struct module *o);
|
|
void ssam_device_driver_unregister(struct ssam_device_driver *d);
|
|
|
|
/**
|
|
* ssam_device_driver_register() - Register a SSAM client device driver.
|
|
* @drv: The driver to register.
|
|
*/
|
|
#define ssam_device_driver_register(drv) \
|
|
__ssam_device_driver_register(drv, THIS_MODULE)
|
|
|
|
/**
|
|
* module_ssam_device_driver() - Helper macro for SSAM device driver
|
|
* registration.
|
|
* @drv: The driver managed by this module.
|
|
*
|
|
* Helper macro to register a SSAM device driver via module_init() and
|
|
* module_exit(). This macro may only be used once per module and replaces the
|
|
* aforementioned definitions.
|
|
*/
|
|
#define module_ssam_device_driver(drv) \
|
|
module_driver(drv, ssam_device_driver_register, \
|
|
ssam_device_driver_unregister)
|
|
|
|
|
|
/* -- Helpers for client-device requests. ----------------------------------- */
|
|
|
|
/**
|
|
* SSAM_DEFINE_SYNC_REQUEST_CL_N() - Define synchronous client-device SAM
|
|
* request function with neither argument nor return value.
|
|
* @name: Name of the generated function.
|
|
* @spec: Specification (&struct ssam_request_spec_md) defining the request.
|
|
*
|
|
* Defines a function executing the synchronous SAM request specified by
|
|
* @spec, with the request having neither argument nor return value. Device
|
|
* specifying parameters are not hard-coded, but instead are provided via the
|
|
* client device, specifically its UID, supplied when calling this function.
|
|
* The generated function takes care of setting up the request struct, buffer
|
|
* allocation, as well as execution of the request itself, returning once the
|
|
* request has been fully completed. The required transport buffer will be
|
|
* allocated on the stack.
|
|
*
|
|
* The generated function is defined as ``int name(struct ssam_device *sdev)``,
|
|
* returning the status of the request, which is zero on success and negative
|
|
* on failure. The ``sdev`` parameter specifies both the target device of the
|
|
* request and by association the controller via which the request is sent.
|
|
*
|
|
* Refer to ssam_request_sync_onstack() for more details on the behavior of
|
|
* the generated function.
|
|
*/
|
|
#define SSAM_DEFINE_SYNC_REQUEST_CL_N(name, spec...) \
|
|
SSAM_DEFINE_SYNC_REQUEST_MD_N(__raw_##name, spec) \
|
|
int name(struct ssam_device *sdev) \
|
|
{ \
|
|
return __raw_##name(sdev->ctrl, sdev->uid.target, \
|
|
sdev->uid.instance); \
|
|
}
|
|
|
|
/**
|
|
* SSAM_DEFINE_SYNC_REQUEST_CL_W() - Define synchronous client-device SAM
|
|
* request function with argument.
|
|
* @name: Name of the generated function.
|
|
* @atype: Type of the request's argument.
|
|
* @spec: Specification (&struct ssam_request_spec_md) defining the request.
|
|
*
|
|
* Defines a function executing the synchronous SAM request specified by
|
|
* @spec, with the request taking an argument of type @atype and having no
|
|
* return value. Device specifying parameters are not hard-coded, but instead
|
|
* are provided via the client device, specifically its UID, supplied when
|
|
* calling this function. The generated function takes care of setting up the
|
|
* request struct, buffer allocation, as well as execution of the request
|
|
* itself, returning once the request has been fully completed. The required
|
|
* transport buffer will be allocated on the stack.
|
|
*
|
|
* The generated function is defined as ``int name(struct ssam_device *sdev,
|
|
* const atype *arg)``, returning the status of the request, which is zero on
|
|
* success and negative on failure. The ``sdev`` parameter specifies both the
|
|
* target device of the request and by association the controller via which
|
|
* the request is sent. The request's argument is specified via the ``arg``
|
|
* pointer.
|
|
*
|
|
* Refer to ssam_request_sync_onstack() for more details on the behavior of
|
|
* the generated function.
|
|
*/
|
|
#define SSAM_DEFINE_SYNC_REQUEST_CL_W(name, atype, spec...) \
|
|
SSAM_DEFINE_SYNC_REQUEST_MD_W(__raw_##name, atype, spec) \
|
|
int name(struct ssam_device *sdev, const atype *arg) \
|
|
{ \
|
|
return __raw_##name(sdev->ctrl, sdev->uid.target, \
|
|
sdev->uid.instance, arg); \
|
|
}
|
|
|
|
/**
|
|
* SSAM_DEFINE_SYNC_REQUEST_CL_R() - Define synchronous client-device SAM
|
|
* request function with return value.
|
|
* @name: Name of the generated function.
|
|
* @rtype: Type of the request's return value.
|
|
* @spec: Specification (&struct ssam_request_spec_md) defining the request.
|
|
*
|
|
* Defines a function executing the synchronous SAM request specified by
|
|
* @spec, with the request taking no argument but having a return value of
|
|
* type @rtype. Device specifying parameters are not hard-coded, but instead
|
|
* are provided via the client device, specifically its UID, supplied when
|
|
* calling this function. The generated function takes care of setting up the
|
|
* request struct, buffer allocation, as well as execution of the request
|
|
* itself, returning once the request has been fully completed. The required
|
|
* transport buffer will be allocated on the stack.
|
|
*
|
|
* The generated function is defined as ``int name(struct ssam_device *sdev,
|
|
* rtype *ret)``, returning the status of the request, which is zero on
|
|
* success and negative on failure. The ``sdev`` parameter specifies both the
|
|
* target device of the request and by association the controller via which
|
|
* the request is sent. The request's return value is written to the memory
|
|
* pointed to by the ``ret`` parameter.
|
|
*
|
|
* Refer to ssam_request_sync_onstack() for more details on the behavior of
|
|
* the generated function.
|
|
*/
|
|
#define SSAM_DEFINE_SYNC_REQUEST_CL_R(name, rtype, spec...) \
|
|
SSAM_DEFINE_SYNC_REQUEST_MD_R(__raw_##name, rtype, spec) \
|
|
int name(struct ssam_device *sdev, rtype *ret) \
|
|
{ \
|
|
return __raw_##name(sdev->ctrl, sdev->uid.target, \
|
|
sdev->uid.instance, ret); \
|
|
}
|
|
|
|
#endif /* _LINUX_SURFACE_AGGREGATOR_DEVICE_H */
|