From 9f794056db5bb1e1add83ed553b6aec57298358c Mon Sep 17 00:00:00 2001 From: Maximilian Luz Date: Fri, 24 Jun 2022 20:36:40 +0200 Subject: platform/surface: Add KIP/POS tablet-mode switch driver MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a driver providing a tablet-mode switch input device for Microsoft Surface devices using the Surface Aggregator KIP subsystem (to manage detachable peripherals) or POS subsystem (to obtain device posture information). The KIP (full name unknown, abbreviation found through reverse engineering) subsystem is used on the Surface Pro 8 and Surface Pro X to manage the keyboard cover. Among other things, it provides information on the positioning (posture) of the cover (closed, laptop-style, detached, folded-back, ...), which can be used to implement an input device providing the SW_TABLET_MODE event. Similarly, the POS (posture information) subsystem provides such information on the Surface Laptop Studio, with the difference being that the keyboard is not detachable. As implementing the tablet-mode switch for both subsystems is largely similar, the driver proposed in this commit, in large, acts as a generic tablet mode switch driver framework for the Surface Aggregator Module. Specific implementations using this framework are provided for the KIP and POS subsystems, adding tablet-mode switch support to the aforementioned devices. A few more notes on the Surface Laptop Studio: A peculiarity of the Surface Laptop Studio is its "slate/tent" mode (symbolized: user> _/\). In this mode, the screen covers the keyboard but leaves the touchpad exposed. This is essentially a mode in-between tablet and laptop, and it is debatable whether tablet-mode should be enabled in this mode. We therefore let the user decide this via a module parameter. In particular, tablet-mode may bring up the on-screen touch keyboard more easily, which would be desirable in this mode. However, some user-space software currently also decides to disable keyboard and, more importantly, touchpad input, while the touchpad is still accessible in the "slate/tent" mode. Furthermore, this mode shares its identifier with "slate/flipped" mode where the screen is flipped 180° and the keyboard points away from the user (symbolized: user> /_). In this mode we would like to enable auto-rotation, something that user-space software may only do when tablet-mode is enabled. We therefore default to the slate-mode enabling the tablet-mode switch. Signed-off-by: Maximilian Luz Link: https://lore.kernel.org/r/20220624183642.910893-3-luzmaximilian@gmail.com Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede --- drivers/platform/surface/Kconfig | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'drivers/platform/surface/Kconfig') diff --git a/drivers/platform/surface/Kconfig b/drivers/platform/surface/Kconfig index eb79fbed8059..b152e930cc84 100644 --- a/drivers/platform/surface/Kconfig +++ b/drivers/platform/surface/Kconfig @@ -99,6 +99,29 @@ config SURFACE_AGGREGATOR_REGISTRY the respective client devices. Drivers for these devices still need to be selected via the other options. +config SURFACE_AGGREGATOR_TABLET_SWITCH + tristate "Surface Aggregator Generic Tablet-Mode Switch Driver" + depends on SURFACE_AGGREGATOR + depends on SURFACE_AGGREGATOR_BUS + depends on INPUT + help + Provides a tablet-mode switch input device on Microsoft Surface models + using the KIP subsystem for detachable keyboards (e.g. keyboard covers) + or the POS subsystem for device/screen posture changes. + + The KIP subsystem is used on newer Surface generations to handle + detachable input peripherals, specifically the keyboard cover (containing + keyboard and touchpad) on the Surface Pro 8 and Surface Pro X. The POS + subsystem is used for device posture change notifications on the Surface + Laptop Studio. This module provides a driver to let user-space know when + the device should be considered in tablet-mode due to the keyboard cover + being detached or folded back (essentially signaling when the keyboard is + not available for input). It does so by creating a tablet-mode switch + input device, sending the standard SW_TABLET_MODE event on mode change. + + Select M or Y here, if you want to provide tablet-mode switch input + events on the Surface Pro 8, Surface Pro X, and Surface Laptop Studio. + config SURFACE_DTX tristate "Surface DTX (Detachment System) Driver" depends on SURFACE_AGGREGATOR -- cgit v1.2.3 From 993a9e2aca6e6432695082d689353a03662d18d1 Mon Sep 17 00:00:00 2001 From: Maximilian Luz Date: Fri, 24 Jun 2022 22:57:59 +0200 Subject: platform/surface: aggregator: Move subsystem hub drivers to their own module Split out subsystem device hub drivers into their own module. This allows us to load the hub drivers separately from the registry, which will help future DT/OF support. While doing so, also remove a small bit of code duplication. Signed-off-by: Maximilian Luz Link: https://lore.kernel.org/r/20220624205800.1355621-3-luzmaximilian@gmail.com Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede --- MAINTAINERS | 6 + drivers/platform/surface/Kconfig | 35 +- drivers/platform/surface/Makefile | 1 + drivers/platform/surface/surface_aggregator_hub.c | 371 +++++++++++++++++++++ .../platform/surface/surface_aggregator_registry.c | 371 +-------------------- 5 files changed, 410 insertions(+), 374 deletions(-) create mode 100644 drivers/platform/surface/surface_aggregator_hub.c (limited to 'drivers/platform/surface/Kconfig') diff --git a/MAINTAINERS b/MAINTAINERS index c6d8c0c6bf6e..e01478062c56 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -13253,6 +13253,12 @@ F: include/linux/surface_acpi_notify.h F: include/linux/surface_aggregator/ F: include/uapi/linux/surface_aggregator/ +MICROSOFT SURFACE SYSTEM AGGREGATOR HUB DRIVER +M: Maximilian Luz +L: platform-driver-x86@vger.kernel.org +S: Maintained +F: drivers/platform/surface/surface_aggregator_hub.c + MICROTEK X6 SCANNER M: Oliver Neukum S: Maintained diff --git a/drivers/platform/surface/Kconfig b/drivers/platform/surface/Kconfig index b152e930cc84..b629e82af97c 100644 --- a/drivers/platform/surface/Kconfig +++ b/drivers/platform/surface/Kconfig @@ -72,18 +72,45 @@ config SURFACE_AGGREGATOR_CDEV The provided interface is intended for debugging and development only, and should not be used otherwise. +config SURFACE_AGGREGATOR_HUB + tristate "Surface System Aggregator Module Subsystem Device Hubs" + depends on SURFACE_AGGREGATOR + depends on SURFACE_AGGREGATOR_BUS + help + Device-hub drivers for Surface System Aggregator Module (SSAM) subsystem + devices. + + Provides subsystem hub drivers which manage client devices on various + SSAM subsystems. In some subsystems, notably the BAS subsystem managing + devices contained in the base of the Surface Book 3 and the KIP subsystem + managing type-cover devices in the Surface Pro 8 and Surface Pro X, + devices can be (hot-)removed. Hub devices and drivers are required to + manage these subdevices. + + Devices managed via these hubs are: + - Battery/AC devices (Surface Book 3). + - HID input devices (7th-generation and later models with detachable + input devices). + + Select M (recommended) or Y here if you want support for the above + mentioned devices on the corresponding Surface models. Without this + module, the respective devices mentioned above will not be instantiated + and thus any functionality provided by them will be missing, even when + drivers for these devices are present. This module only provides the + respective subsystem hubs. Both drivers and device specification (e.g. + via the Surface Aggregator Registry) for these devices still need to be + selected via other options. + config SURFACE_AGGREGATOR_REGISTRY tristate "Surface System Aggregator Module Device Registry" depends on SURFACE_AGGREGATOR depends on SURFACE_AGGREGATOR_BUS help - Device-registry and device-hubs for Surface System Aggregator Module - (SSAM) devices. + Device-registry for Surface System Aggregator Module (SSAM) devices. Provides a module and driver which act as a device-registry for SSAM client devices that cannot be detected automatically, e.g. via ACPI. - Such devices are instead provided via this registry and attached via - device hubs, also provided in this module. + Such devices are instead provided and managed via this registry. Devices provided via this registry are: - Platform profile (performance-/cooling-mode) device (5th- and later diff --git a/drivers/platform/surface/Makefile b/drivers/platform/surface/Makefile index 18b27898543e..53344330939b 100644 --- a/drivers/platform/surface/Makefile +++ b/drivers/platform/surface/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_SURFACE_3_POWER_OPREGION) += surface3_power.o obj-$(CONFIG_SURFACE_ACPI_NOTIFY) += surface_acpi_notify.o obj-$(CONFIG_SURFACE_AGGREGATOR) += aggregator/ obj-$(CONFIG_SURFACE_AGGREGATOR_CDEV) += surface_aggregator_cdev.o +obj-$(CONFIG_SURFACE_AGGREGATOR_HUB) += surface_aggregator_hub.o obj-$(CONFIG_SURFACE_AGGREGATOR_REGISTRY) += surface_aggregator_registry.o obj-$(CONFIG_SURFACE_AGGREGATOR_TABLET_SWITCH) += surface_aggregator_tabletsw.o obj-$(CONFIG_SURFACE_DTX) += surface_dtx.o diff --git a/drivers/platform/surface/surface_aggregator_hub.c b/drivers/platform/surface/surface_aggregator_hub.c new file mode 100644 index 000000000000..43061514be38 --- /dev/null +++ b/drivers/platform/surface/surface_aggregator_hub.c @@ -0,0 +1,371 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Driver for Surface System Aggregator Module (SSAM) subsystem device hubs. + * + * Provides a driver for SSAM subsystems device hubs. This driver performs + * instantiation of the devices managed by said hubs and takes care of + * (hot-)removal. + * + * Copyright (C) 2020-2022 Maximilian Luz + */ + +#include +#include +#include +#include +#include + +#include + + +/* -- SSAM generic subsystem hub driver framework. -------------------------- */ + +enum ssam_hub_state { + SSAM_HUB_UNINITIALIZED, /* Only set during initialization. */ + SSAM_HUB_CONNECTED, + SSAM_HUB_DISCONNECTED, +}; + +enum ssam_hub_flags { + SSAM_HUB_HOT_REMOVED, +}; + +struct ssam_hub; + +struct ssam_hub_ops { + int (*get_state)(struct ssam_hub *hub, enum ssam_hub_state *state); +}; + +struct ssam_hub { + struct ssam_device *sdev; + + enum ssam_hub_state state; + unsigned long flags; + + struct delayed_work update_work; + unsigned long connect_delay; + + struct ssam_event_notifier notif; + struct ssam_hub_ops ops; +}; + +struct ssam_hub_desc { + struct { + struct ssam_event_registry reg; + struct ssam_event_id id; + enum ssam_event_mask mask; + } event; + + struct { + u32 (*notify)(struct ssam_event_notifier *nf, const struct ssam_event *event); + int (*get_state)(struct ssam_hub *hub, enum ssam_hub_state *state); + } ops; + + unsigned long connect_delay_ms; +}; + +static void ssam_hub_update_workfn(struct work_struct *work) +{ + struct ssam_hub *hub = container_of(work, struct ssam_hub, update_work.work); + enum ssam_hub_state state; + int status = 0; + + status = hub->ops.get_state(hub, &state); + if (status) + return; + + /* + * There is a small possibility that hub devices were hot-removed and + * re-added before we were able to remove them here. In that case, both + * the state returned by get_state() and the state of the hub will + * equal SSAM_HUB_CONNECTED and we would bail early below, which would + * leave child devices without proper (re-)initialization and the + * hot-remove flag set. + * + * Therefore, we check whether devices have been hot-removed via an + * additional flag on the hub and, in this case, override the returned + * hub state. In case of a missed disconnect (i.e. get_state returned + * "connected"), we further need to re-schedule this work (with the + * appropriate delay) as the actual connect work submission might have + * been merged with this one. + * + * This then leads to one of two cases: Either we submit an unnecessary + * work item (which will get ignored via either the queue or the state + * checks) or, in the unlikely case that the work is actually required, + * double the normal connect delay. + */ + if (test_and_clear_bit(SSAM_HUB_HOT_REMOVED, &hub->flags)) { + if (state == SSAM_HUB_CONNECTED) + schedule_delayed_work(&hub->update_work, hub->connect_delay); + + state = SSAM_HUB_DISCONNECTED; + } + + if (hub->state == state) + return; + hub->state = state; + + if (hub->state == SSAM_HUB_CONNECTED) + status = ssam_device_register_clients(hub->sdev); + else + ssam_remove_clients(&hub->sdev->dev); + + if (status) + dev_err(&hub->sdev->dev, "failed to update hub child devices: %d\n", status); +} + +static int ssam_hub_mark_hot_removed(struct device *dev, void *_data) +{ + struct ssam_device *sdev = to_ssam_device(dev); + + if (is_ssam_device(dev)) + ssam_device_mark_hot_removed(sdev); + + return 0; +} + +static void ssam_hub_update(struct ssam_hub *hub, bool connected) +{ + unsigned long delay; + + /* Mark devices as hot-removed before we remove any. */ + if (!connected) { + set_bit(SSAM_HUB_HOT_REMOVED, &hub->flags); + device_for_each_child_reverse(&hub->sdev->dev, NULL, ssam_hub_mark_hot_removed); + } + + /* + * Delay update when the base/keyboard cover is being connected to give + * devices/EC some time to set up. + */ + delay = connected ? hub->connect_delay : 0; + + schedule_delayed_work(&hub->update_work, delay); +} + +static int __maybe_unused ssam_hub_resume(struct device *dev) +{ + struct ssam_hub *hub = dev_get_drvdata(dev); + + schedule_delayed_work(&hub->update_work, 0); + return 0; +} +static SIMPLE_DEV_PM_OPS(ssam_hub_pm_ops, NULL, ssam_hub_resume); + +static int ssam_hub_probe(struct ssam_device *sdev) +{ + const struct ssam_hub_desc *desc; + struct ssam_hub *hub; + int status; + + desc = ssam_device_get_match_data(sdev); + if (!desc) { + WARN(1, "no driver match data specified"); + return -EINVAL; + } + + hub = devm_kzalloc(&sdev->dev, sizeof(*hub), GFP_KERNEL); + if (!hub) + return -ENOMEM; + + hub->sdev = sdev; + hub->state = SSAM_HUB_UNINITIALIZED; + + hub->notif.base.priority = INT_MAX; /* This notifier should run first. */ + hub->notif.base.fn = desc->ops.notify; + hub->notif.event.reg = desc->event.reg; + hub->notif.event.id = desc->event.id; + hub->notif.event.mask = desc->event.mask; + hub->notif.event.flags = SSAM_EVENT_SEQUENCED; + + hub->connect_delay = msecs_to_jiffies(desc->connect_delay_ms); + hub->ops.get_state = desc->ops.get_state; + + INIT_DELAYED_WORK(&hub->update_work, ssam_hub_update_workfn); + + ssam_device_set_drvdata(sdev, hub); + + status = ssam_device_notifier_register(sdev, &hub->notif); + if (status) + return status; + + schedule_delayed_work(&hub->update_work, 0); + return 0; +} + +static void ssam_hub_remove(struct ssam_device *sdev) +{ + struct ssam_hub *hub = ssam_device_get_drvdata(sdev); + + ssam_device_notifier_unregister(sdev, &hub->notif); + cancel_delayed_work_sync(&hub->update_work); + ssam_remove_clients(&sdev->dev); +} + + +/* -- SSAM base-subsystem hub driver. --------------------------------------- */ + +/* + * Some devices (especially battery) may need a bit of time to be fully usable + * after being (re-)connected. This delay has been determined via + * experimentation. + */ +#define SSAM_BASE_UPDATE_CONNECT_DELAY 2500 + +SSAM_DEFINE_SYNC_REQUEST_R(ssam_bas_query_opmode, u8, { + .target_category = SSAM_SSH_TC_BAS, + .target_id = 0x01, + .command_id = 0x0d, + .instance_id = 0x00, +}); + +#define SSAM_BAS_OPMODE_TABLET 0x00 +#define SSAM_EVENT_BAS_CID_CONNECTION 0x0c + +static int ssam_base_hub_query_state(struct ssam_hub *hub, enum ssam_hub_state *state) +{ + u8 opmode; + int status; + + status = ssam_retry(ssam_bas_query_opmode, hub->sdev->ctrl, &opmode); + if (status < 0) { + dev_err(&hub->sdev->dev, "failed to query base state: %d\n", status); + return status; + } + + if (opmode != SSAM_BAS_OPMODE_TABLET) + *state = SSAM_HUB_CONNECTED; + else + *state = SSAM_HUB_DISCONNECTED; + + return 0; +} + +static u32 ssam_base_hub_notif(struct ssam_event_notifier *nf, const struct ssam_event *event) +{ + struct ssam_hub *hub = container_of(nf, struct ssam_hub, notif); + + if (event->command_id != SSAM_EVENT_BAS_CID_CONNECTION) + return 0; + + if (event->length < 1) { + dev_err(&hub->sdev->dev, "unexpected payload size: %u\n", event->length); + return 0; + } + + ssam_hub_update(hub, event->data[0]); + + /* + * Do not return SSAM_NOTIF_HANDLED: The event should be picked up and + * consumed by the detachment system driver. We're just a (more or less) + * silent observer. + */ + return 0; +} + +static const struct ssam_hub_desc base_hub = { + .event = { + .reg = SSAM_EVENT_REGISTRY_SAM, + .id = { + .target_category = SSAM_SSH_TC_BAS, + .instance = 0, + }, + .mask = SSAM_EVENT_MASK_NONE, + }, + .ops = { + .notify = ssam_base_hub_notif, + .get_state = ssam_base_hub_query_state, + }, + .connect_delay_ms = SSAM_BASE_UPDATE_CONNECT_DELAY, +}; + + +/* -- SSAM KIP-subsystem hub driver. ---------------------------------------- */ + +/* + * Some devices may need a bit of time to be fully usable after being + * (re-)connected. This delay has been determined via experimentation. + */ +#define SSAM_KIP_UPDATE_CONNECT_DELAY 250 + +#define SSAM_EVENT_KIP_CID_CONNECTION 0x2c + +SSAM_DEFINE_SYNC_REQUEST_R(__ssam_kip_query_state, u8, { + .target_category = SSAM_SSH_TC_KIP, + .target_id = 0x01, + .command_id = 0x2c, + .instance_id = 0x00, +}); + +static int ssam_kip_hub_query_state(struct ssam_hub *hub, enum ssam_hub_state *state) +{ + int status; + u8 connected; + + status = ssam_retry(__ssam_kip_query_state, hub->sdev->ctrl, &connected); + if (status < 0) { + dev_err(&hub->sdev->dev, "failed to query KIP connection state: %d\n", status); + return status; + } + + *state = connected ? SSAM_HUB_CONNECTED : SSAM_HUB_DISCONNECTED; + return 0; +} + +static u32 ssam_kip_hub_notif(struct ssam_event_notifier *nf, const struct ssam_event *event) +{ + struct ssam_hub *hub = container_of(nf, struct ssam_hub, notif); + + if (event->command_id != SSAM_EVENT_KIP_CID_CONNECTION) + return 0; /* Return "unhandled". */ + + if (event->length < 1) { + dev_err(&hub->sdev->dev, "unexpected payload size: %u\n", event->length); + return 0; + } + + ssam_hub_update(hub, event->data[0]); + return SSAM_NOTIF_HANDLED; +} + +static const struct ssam_hub_desc kip_hub = { + .event = { + .reg = SSAM_EVENT_REGISTRY_SAM, + .id = { + .target_category = SSAM_SSH_TC_KIP, + .instance = 0, + }, + .mask = SSAM_EVENT_MASK_TARGET, + }, + .ops = { + .notify = ssam_kip_hub_notif, + .get_state = ssam_kip_hub_query_state, + }, + .connect_delay_ms = SSAM_KIP_UPDATE_CONNECT_DELAY, +}; + + +/* -- Driver registration. -------------------------------------------------- */ + +static const struct ssam_device_id ssam_hub_match[] = { + { SSAM_VDEV(HUB, 0x01, SSAM_SSH_TC_KIP, 0x00), (unsigned long)&kip_hub }, + { SSAM_VDEV(HUB, 0x02, SSAM_SSH_TC_BAS, 0x00), (unsigned long)&base_hub }, + { } +}; +MODULE_DEVICE_TABLE(ssam, ssam_hub_match); + +static struct ssam_device_driver ssam_subsystem_hub_driver = { + .probe = ssam_hub_probe, + .remove = ssam_hub_remove, + .match_table = ssam_hub_match, + .driver = { + .name = "surface_aggregator_subsystem_hub", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .pm = &ssam_hub_pm_ops, + }, +}; +module_ssam_device_driver(ssam_subsystem_hub_driver); + +MODULE_AUTHOR("Maximilian Luz "); +MODULE_DESCRIPTION("Subsystem device hub driver for Surface System Aggregator Module"); +MODULE_LICENSE("GPL"); diff --git a/drivers/platform/surface/surface_aggregator_registry.c b/drivers/platform/surface/surface_aggregator_registry.c index c680792a037e..0cbb7f3a6b2d 100644 --- a/drivers/platform/surface/surface_aggregator_registry.c +++ b/drivers/platform/surface/surface_aggregator_registry.c @@ -11,14 +11,11 @@ #include #include -#include #include #include #include #include -#include -#include #include @@ -286,335 +283,6 @@ static const struct software_node *ssam_node_group_sp8[] = { }; -/* -- SSAM generic subsystem hub driver framework. -------------------------- */ - -enum ssam_hub_state { - SSAM_HUB_UNINITIALIZED, /* Only set during initialization. */ - SSAM_HUB_CONNECTED, - SSAM_HUB_DISCONNECTED, -}; - -enum ssam_hub_flags { - SSAM_HUB_HOT_REMOVED, -}; - -struct ssam_hub { - struct ssam_device *sdev; - - enum ssam_hub_state state; - unsigned long flags; - - struct delayed_work update_work; - unsigned long connect_delay; - - struct ssam_event_notifier notif; - - int (*get_state)(struct ssam_hub *hub, enum ssam_hub_state *state); -}; - -static void ssam_hub_update_workfn(struct work_struct *work) -{ - struct ssam_hub *hub = container_of(work, struct ssam_hub, update_work.work); - enum ssam_hub_state state; - int status = 0; - - status = hub->get_state(hub, &state); - if (status) - return; - - /* - * There is a small possibility that hub devices were hot-removed and - * re-added before we were able to remove them here. In that case, both - * the state returned by get_state() and the state of the hub will - * equal SSAM_HUB_CONNECTED and we would bail early below, which would - * leave child devices without proper (re-)initialization and the - * hot-remove flag set. - * - * Therefore, we check whether devices have been hot-removed via an - * additional flag on the hub and, in this case, override the returned - * hub state. In case of a missed disconnect (i.e. get_state returned - * "connected"), we further need to re-schedule this work (with the - * appropriate delay) as the actual connect work submission might have - * been merged with this one. - * - * This then leads to one of two cases: Either we submit an unnecessary - * work item (which will get ignored via either the queue or the state - * checks) or, in the unlikely case that the work is actually required, - * double the normal connect delay. - */ - if (test_and_clear_bit(SSAM_HUB_HOT_REMOVED, &hub->flags)) { - if (state == SSAM_HUB_CONNECTED) - schedule_delayed_work(&hub->update_work, hub->connect_delay); - - state = SSAM_HUB_DISCONNECTED; - } - - if (hub->state == state) - return; - hub->state = state; - - if (hub->state == SSAM_HUB_CONNECTED) - status = ssam_device_register_clients(hub->sdev); - else - ssam_remove_clients(&hub->sdev->dev); - - if (status) - dev_err(&hub->sdev->dev, "failed to update hub child devices: %d\n", status); -} - -static int ssam_hub_mark_hot_removed(struct device *dev, void *_data) -{ - struct ssam_device *sdev = to_ssam_device(dev); - - if (is_ssam_device(dev)) - ssam_device_mark_hot_removed(sdev); - - return 0; -} - -static void ssam_hub_update(struct ssam_hub *hub, bool connected) -{ - unsigned long delay; - - /* Mark devices as hot-removed before we remove any. */ - if (!connected) { - set_bit(SSAM_HUB_HOT_REMOVED, &hub->flags); - device_for_each_child_reverse(&hub->sdev->dev, NULL, ssam_hub_mark_hot_removed); - } - - /* - * Delay update when the base/keyboard cover is being connected to give - * devices/EC some time to set up. - */ - delay = connected ? hub->connect_delay : 0; - - schedule_delayed_work(&hub->update_work, delay); -} - -static int __maybe_unused ssam_hub_resume(struct device *dev) -{ - struct ssam_hub *hub = dev_get_drvdata(dev); - - schedule_delayed_work(&hub->update_work, 0); - return 0; -} -static SIMPLE_DEV_PM_OPS(ssam_hub_pm_ops, NULL, ssam_hub_resume); - -static int ssam_hub_setup(struct ssam_device *sdev, struct ssam_hub *hub) -{ - int status; - - hub->sdev = sdev; - hub->state = SSAM_HUB_UNINITIALIZED; - - INIT_DELAYED_WORK(&hub->update_work, ssam_hub_update_workfn); - - ssam_device_set_drvdata(sdev, hub); - - status = ssam_device_notifier_register(sdev, &hub->notif); - if (status) - return status; - - schedule_delayed_work(&hub->update_work, 0); - return 0; -} - -static void ssam_hub_remove(struct ssam_device *sdev) -{ - struct ssam_hub *hub = ssam_device_get_drvdata(sdev); - - ssam_device_notifier_unregister(sdev, &hub->notif); - cancel_delayed_work_sync(&hub->update_work); - ssam_remove_clients(&sdev->dev); -} - - -/* -- SSAM base-hub driver. ------------------------------------------------- */ - -/* - * Some devices (especially battery) may need a bit of time to be fully usable - * after being (re-)connected. This delay has been determined via - * experimentation. - */ -#define SSAM_BASE_UPDATE_CONNECT_DELAY msecs_to_jiffies(2500) - -SSAM_DEFINE_SYNC_REQUEST_R(ssam_bas_query_opmode, u8, { - .target_category = SSAM_SSH_TC_BAS, - .target_id = 0x01, - .command_id = 0x0d, - .instance_id = 0x00, -}); - -#define SSAM_BAS_OPMODE_TABLET 0x00 -#define SSAM_EVENT_BAS_CID_CONNECTION 0x0c - -static int ssam_base_hub_query_state(struct ssam_hub *hub, enum ssam_hub_state *state) -{ - u8 opmode; - int status; - - status = ssam_retry(ssam_bas_query_opmode, hub->sdev->ctrl, &opmode); - if (status < 0) { - dev_err(&hub->sdev->dev, "failed to query base state: %d\n", status); - return status; - } - - if (opmode != SSAM_BAS_OPMODE_TABLET) - *state = SSAM_HUB_CONNECTED; - else - *state = SSAM_HUB_DISCONNECTED; - - return 0; -} - -static u32 ssam_base_hub_notif(struct ssam_event_notifier *nf, const struct ssam_event *event) -{ - struct ssam_hub *hub = container_of(nf, struct ssam_hub, notif); - - if (event->command_id != SSAM_EVENT_BAS_CID_CONNECTION) - return 0; - - if (event->length < 1) { - dev_err(&hub->sdev->dev, "unexpected payload size: %u\n", event->length); - return 0; - } - - ssam_hub_update(hub, event->data[0]); - - /* - * Do not return SSAM_NOTIF_HANDLED: The event should be picked up and - * consumed by the detachment system driver. We're just a (more or less) - * silent observer. - */ - return 0; -} - -static int ssam_base_hub_probe(struct ssam_device *sdev) -{ - struct ssam_hub *hub; - - hub = devm_kzalloc(&sdev->dev, sizeof(*hub), GFP_KERNEL); - if (!hub) - return -ENOMEM; - - hub->notif.base.priority = INT_MAX; /* This notifier should run first. */ - hub->notif.base.fn = ssam_base_hub_notif; - hub->notif.event.reg = SSAM_EVENT_REGISTRY_SAM; - hub->notif.event.id.target_category = SSAM_SSH_TC_BAS, - hub->notif.event.id.instance = 0, - hub->notif.event.mask = SSAM_EVENT_MASK_NONE; - hub->notif.event.flags = SSAM_EVENT_SEQUENCED; - - hub->connect_delay = SSAM_BASE_UPDATE_CONNECT_DELAY; - hub->get_state = ssam_base_hub_query_state; - - return ssam_hub_setup(sdev, hub); -} - -static const struct ssam_device_id ssam_base_hub_match[] = { - { SSAM_VDEV(HUB, 0x02, SSAM_SSH_TC_BAS, 0x00) }, - { }, -}; - -static struct ssam_device_driver ssam_base_hub_driver = { - .probe = ssam_base_hub_probe, - .remove = ssam_hub_remove, - .match_table = ssam_base_hub_match, - .driver = { - .name = "surface_aggregator_base_hub", - .probe_type = PROBE_PREFER_ASYNCHRONOUS, - .pm = &ssam_hub_pm_ops, - }, -}; - - -/* -- SSAM KIP-subsystem hub driver. ---------------------------------------- */ - -/* - * Some devices may need a bit of time to be fully usable after being - * (re-)connected. This delay has been determined via experimentation. - */ -#define SSAM_KIP_UPDATE_CONNECT_DELAY msecs_to_jiffies(250) - -#define SSAM_EVENT_KIP_CID_CONNECTION 0x2c - -SSAM_DEFINE_SYNC_REQUEST_R(__ssam_kip_get_connection_state, u8, { - .target_category = SSAM_SSH_TC_KIP, - .target_id = 0x01, - .command_id = 0x2c, - .instance_id = 0x00, -}); - -static int ssam_kip_get_connection_state(struct ssam_hub *hub, enum ssam_hub_state *state) -{ - int status; - u8 connected; - - status = ssam_retry(__ssam_kip_get_connection_state, hub->sdev->ctrl, &connected); - if (status < 0) { - dev_err(&hub->sdev->dev, "failed to query KIP connection state: %d\n", status); - return status; - } - - *state = connected ? SSAM_HUB_CONNECTED : SSAM_HUB_DISCONNECTED; - return 0; -} - -static u32 ssam_kip_hub_notif(struct ssam_event_notifier *nf, const struct ssam_event *event) -{ - struct ssam_hub *hub = container_of(nf, struct ssam_hub, notif); - - if (event->command_id != SSAM_EVENT_KIP_CID_CONNECTION) - return 0; /* Return "unhandled". */ - - if (event->length < 1) { - dev_err(&hub->sdev->dev, "unexpected payload size: %u\n", event->length); - return 0; - } - - ssam_hub_update(hub, event->data[0]); - return SSAM_NOTIF_HANDLED; -} - -static int ssam_kip_hub_probe(struct ssam_device *sdev) -{ - struct ssam_hub *hub; - - hub = devm_kzalloc(&sdev->dev, sizeof(*hub), GFP_KERNEL); - if (!hub) - return -ENOMEM; - - hub->notif.base.priority = INT_MAX; /* This notifier should run first. */ - hub->notif.base.fn = ssam_kip_hub_notif; - hub->notif.event.reg = SSAM_EVENT_REGISTRY_SAM; - hub->notif.event.id.target_category = SSAM_SSH_TC_KIP, - hub->notif.event.id.instance = 0, - hub->notif.event.mask = SSAM_EVENT_MASK_TARGET; - hub->notif.event.flags = SSAM_EVENT_SEQUENCED; - - hub->connect_delay = SSAM_KIP_UPDATE_CONNECT_DELAY; - hub->get_state = ssam_kip_get_connection_state; - - return ssam_hub_setup(sdev, hub); -} - -static const struct ssam_device_id ssam_kip_hub_match[] = { - { SSAM_VDEV(HUB, 0x01, SSAM_SSH_TC_KIP, 0x00) }, - { }, -}; - -static struct ssam_device_driver ssam_kip_hub_driver = { - .probe = ssam_kip_hub_probe, - .remove = ssam_hub_remove, - .match_table = ssam_kip_hub_match, - .driver = { - .name = "surface_kip_hub", - .probe_type = PROBE_PREFER_ASYNCHRONOUS, - .pm = &ssam_hub_pm_ops, - }, -}; - - /* -- SSAM platform/meta-hub driver. ---------------------------------------- */ static const struct acpi_device_id ssam_platform_hub_match[] = { @@ -727,44 +395,7 @@ static struct platform_driver ssam_platform_hub_driver = { .probe_type = PROBE_PREFER_ASYNCHRONOUS, }, }; - - -/* -- Module initialization. ------------------------------------------------ */ - -static int __init ssam_device_hub_init(void) -{ - int status; - - status = platform_driver_register(&ssam_platform_hub_driver); - if (status) - goto err_platform; - - status = ssam_device_driver_register(&ssam_base_hub_driver); - if (status) - goto err_base; - - status = ssam_device_driver_register(&ssam_kip_hub_driver); - if (status) - goto err_kip; - - return 0; - -err_kip: - ssam_device_driver_unregister(&ssam_base_hub_driver); -err_base: - platform_driver_unregister(&ssam_platform_hub_driver); -err_platform: - return status; -} -module_init(ssam_device_hub_init); - -static void __exit ssam_device_hub_exit(void) -{ - ssam_device_driver_unregister(&ssam_kip_hub_driver); - ssam_device_driver_unregister(&ssam_base_hub_driver); - platform_driver_unregister(&ssam_platform_hub_driver); -} -module_exit(ssam_device_hub_exit); +module_platform_driver(ssam_platform_hub_driver); MODULE_AUTHOR("Maximilian Luz "); MODULE_DESCRIPTION("Device-registry for Surface System Aggregator Module"); -- cgit v1.2.3