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Similar to the target category (TC), the target ID (TID) can be one value out of a small number of choices, given in enum ssam_ssh_tid. In the device ID macros, SSAM_SDEV() and SSAM_VDEV() we already use text expansion to, both, remove some textual clutter for the target category values and enforce that the value belongs to the known set. Now that we know the names for the target IDs, use the same trick for them as well. Also rename the SSAM_ANY_x macros to SSAM_SSH_x_ANY to better fit in. Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com> Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> Link: https://lore.kernel.org/r/20221202223327.690880-9-luzmaximilian@gmail.com Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
283 lines
6.7 KiB
C
283 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* AC driver for 7th-generation Microsoft Surface devices via Surface System
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* Aggregator Module (SSAM).
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*
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* Copyright (C) 2019-2021 Maximilian Luz <luzmaximilian@gmail.com>
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*/
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#include <asm/unaligned.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/power_supply.h>
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#include <linux/types.h>
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#include <linux/surface_aggregator/device.h>
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/* -- SAM interface. -------------------------------------------------------- */
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enum sam_event_cid_bat {
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SAM_EVENT_CID_BAT_ADP = 0x17,
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};
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enum sam_battery_sta {
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SAM_BATTERY_STA_OK = 0x0f,
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SAM_BATTERY_STA_PRESENT = 0x10,
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};
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/* Get battery status (_STA). */
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SSAM_DEFINE_SYNC_REQUEST_CL_R(ssam_bat_get_sta, __le32, {
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.target_category = SSAM_SSH_TC_BAT,
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.command_id = 0x01,
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});
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/* Get platform power source for battery (_PSR / DPTF PSRC). */
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SSAM_DEFINE_SYNC_REQUEST_CL_R(ssam_bat_get_psrc, __le32, {
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.target_category = SSAM_SSH_TC_BAT,
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.command_id = 0x0d,
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});
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/* -- Device structures. ---------------------------------------------------- */
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struct spwr_psy_properties {
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const char *name;
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struct ssam_event_registry registry;
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};
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struct spwr_ac_device {
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struct ssam_device *sdev;
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char name[32];
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struct power_supply *psy;
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struct power_supply_desc psy_desc;
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struct ssam_event_notifier notif;
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struct mutex lock; /* Guards access to state below. */
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__le32 state;
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};
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/* -- State management. ----------------------------------------------------- */
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static int spwr_ac_update_unlocked(struct spwr_ac_device *ac)
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{
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__le32 old = ac->state;
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int status;
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lockdep_assert_held(&ac->lock);
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status = ssam_retry(ssam_bat_get_psrc, ac->sdev, &ac->state);
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if (status < 0)
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return status;
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return old != ac->state;
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}
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static int spwr_ac_update(struct spwr_ac_device *ac)
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{
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int status;
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mutex_lock(&ac->lock);
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status = spwr_ac_update_unlocked(ac);
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mutex_unlock(&ac->lock);
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return status;
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}
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static int spwr_ac_recheck(struct spwr_ac_device *ac)
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{
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int status;
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status = spwr_ac_update(ac);
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if (status > 0)
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power_supply_changed(ac->psy);
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return status >= 0 ? 0 : status;
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}
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static u32 spwr_notify_ac(struct ssam_event_notifier *nf, const struct ssam_event *event)
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{
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struct spwr_ac_device *ac;
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int status;
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ac = container_of(nf, struct spwr_ac_device, notif);
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dev_dbg(&ac->sdev->dev, "power event (cid = %#04x, iid = %#04x, tid = %#04x)\n",
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event->command_id, event->instance_id, event->target_id);
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/*
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* Allow events of all targets/instances here. Global adapter status
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* seems to be handled via target=1 and instance=1, but events are
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* reported on all targets/instances in use.
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*
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* While it should be enough to just listen on 1/1, listen everywhere to
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* make sure we don't miss anything.
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*/
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switch (event->command_id) {
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case SAM_EVENT_CID_BAT_ADP:
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status = spwr_ac_recheck(ac);
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return ssam_notifier_from_errno(status) | SSAM_NOTIF_HANDLED;
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default:
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return 0;
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}
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}
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/* -- Properties. ----------------------------------------------------------- */
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static const enum power_supply_property spwr_ac_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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static int spwr_ac_get_property(struct power_supply *psy, enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct spwr_ac_device *ac = power_supply_get_drvdata(psy);
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int status;
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mutex_lock(&ac->lock);
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status = spwr_ac_update_unlocked(ac);
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if (status)
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goto out;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = !!le32_to_cpu(ac->state);
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break;
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default:
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status = -EINVAL;
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goto out;
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}
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out:
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mutex_unlock(&ac->lock);
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return status;
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}
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/* -- Device setup. --------------------------------------------------------- */
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static char *battery_supplied_to[] = {
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"BAT1",
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"BAT2",
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};
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static void spwr_ac_init(struct spwr_ac_device *ac, struct ssam_device *sdev,
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struct ssam_event_registry registry, const char *name)
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{
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mutex_init(&ac->lock);
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strncpy(ac->name, name, ARRAY_SIZE(ac->name) - 1);
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ac->sdev = sdev;
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ac->notif.base.priority = 1;
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ac->notif.base.fn = spwr_notify_ac;
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ac->notif.event.reg = registry;
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ac->notif.event.id.target_category = sdev->uid.category;
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ac->notif.event.id.instance = 0;
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ac->notif.event.mask = SSAM_EVENT_MASK_NONE;
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ac->notif.event.flags = SSAM_EVENT_SEQUENCED;
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ac->psy_desc.name = ac->name;
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ac->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
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ac->psy_desc.properties = spwr_ac_props;
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ac->psy_desc.num_properties = ARRAY_SIZE(spwr_ac_props);
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ac->psy_desc.get_property = spwr_ac_get_property;
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}
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static int spwr_ac_register(struct spwr_ac_device *ac)
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{
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struct power_supply_config psy_cfg = {};
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__le32 sta;
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int status;
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/* Make sure the device is there and functioning properly. */
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status = ssam_retry(ssam_bat_get_sta, ac->sdev, &sta);
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if (status)
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return status;
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if ((le32_to_cpu(sta) & SAM_BATTERY_STA_OK) != SAM_BATTERY_STA_OK)
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return -ENODEV;
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psy_cfg.drv_data = ac;
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psy_cfg.supplied_to = battery_supplied_to;
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psy_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
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ac->psy = devm_power_supply_register(&ac->sdev->dev, &ac->psy_desc, &psy_cfg);
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if (IS_ERR(ac->psy))
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return PTR_ERR(ac->psy);
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return ssam_device_notifier_register(ac->sdev, &ac->notif);
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}
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/* -- Driver setup. --------------------------------------------------------- */
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static int __maybe_unused surface_ac_resume(struct device *dev)
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{
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return spwr_ac_recheck(dev_get_drvdata(dev));
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}
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static SIMPLE_DEV_PM_OPS(surface_ac_pm_ops, NULL, surface_ac_resume);
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static int surface_ac_probe(struct ssam_device *sdev)
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{
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const struct spwr_psy_properties *p;
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struct spwr_ac_device *ac;
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p = ssam_device_get_match_data(sdev);
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if (!p)
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return -ENODEV;
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ac = devm_kzalloc(&sdev->dev, sizeof(*ac), GFP_KERNEL);
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if (!ac)
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return -ENOMEM;
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spwr_ac_init(ac, sdev, p->registry, p->name);
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ssam_device_set_drvdata(sdev, ac);
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return spwr_ac_register(ac);
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}
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static void surface_ac_remove(struct ssam_device *sdev)
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{
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struct spwr_ac_device *ac = ssam_device_get_drvdata(sdev);
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ssam_device_notifier_unregister(sdev, &ac->notif);
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}
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static const struct spwr_psy_properties spwr_psy_props_adp1 = {
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.name = "ADP1",
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.registry = SSAM_EVENT_REGISTRY_SAM,
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};
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static const struct ssam_device_id surface_ac_match[] = {
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{ SSAM_SDEV(BAT, SAM, 0x01, 0x01), (unsigned long)&spwr_psy_props_adp1 },
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{ },
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};
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MODULE_DEVICE_TABLE(ssam, surface_ac_match);
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static struct ssam_device_driver surface_ac_driver = {
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.probe = surface_ac_probe,
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.remove = surface_ac_remove,
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.match_table = surface_ac_match,
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.driver = {
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.name = "surface_ac",
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.pm = &surface_ac_pm_ops,
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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},
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};
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module_ssam_device_driver(surface_ac_driver);
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MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
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MODULE_DESCRIPTION("AC driver for Surface System Aggregator Module");
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MODULE_LICENSE("GPL");
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