1 // SPDX-License-Identifier: GPL-2.0+
3  * AC driver for 7th-generation Microsoft Surface devices via Surface System
6  * Copyright (C) 2019-2021 Maximilian Luz <[email protected]>
19 /* -- SAM interface. -------------------------------------------------------- */
43 /* -- Device structures. ---------------------------------------------------- */
65 /* -- State management. ----------------------------------------------------- */
69 	__le32 old = ac->state;  in spwr_ac_update_unlocked()
72 	lockdep_assert_held(&ac->lock);  in spwr_ac_update_unlocked()
74 	status = ssam_retry(ssam_bat_get_psrc, ac->sdev, &ac->state);  in spwr_ac_update_unlocked()
78 	return old != ac->state;  in spwr_ac_update_unlocked()
85 	mutex_lock(&ac->lock);  in spwr_ac_update()
87 	mutex_unlock(&ac->lock);  in spwr_ac_update()
98 		power_supply_changed(ac->psy);  in spwr_ac_recheck()
110 	dev_dbg(&ac->sdev->dev, "power event (cid = %#04x, iid = %#04x, tid = %#04x)\n",  in spwr_notify_ac()
111 		event->command_id, event->instance_id, event->target_id);  in spwr_notify_ac()
122 	switch (event->command_id) {  in spwr_notify_ac()
133 /* -- Properties. ----------------------------------------------------------- */
145 	mutex_lock(&ac->lock);  in spwr_ac_get_property()
153 		val->intval = !!le32_to_cpu(ac->state);  in spwr_ac_get_property()
157 		status = -EINVAL;  in spwr_ac_get_property()
162 	mutex_unlock(&ac->lock);  in spwr_ac_get_property()
167 /* -- Device setup. --------------------------------------------------------- */
177 	mutex_init(&ac->lock);  in spwr_ac_init()
178 	strscpy(ac->name, name, sizeof(ac->name));  in spwr_ac_init()
180 	ac->sdev = sdev;  in spwr_ac_init()
182 	ac->notif.base.priority = 1;  in spwr_ac_init()
183 	ac->notif.base.fn = spwr_notify_ac;  in spwr_ac_init()
184 	ac->notif.event.reg = registry;  in spwr_ac_init()
185 	ac->notif.event.id.target_category = sdev->uid.category;  in spwr_ac_init()
186 	ac->notif.event.id.instance = 0;  in spwr_ac_init()
187 	ac->notif.event.mask = SSAM_EVENT_MASK_NONE;  in spwr_ac_init()
188 	ac->notif.event.flags = SSAM_EVENT_SEQUENCED;  in spwr_ac_init()
190 	ac->psy_desc.name = ac->name;  in spwr_ac_init()
191 	ac->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;  in spwr_ac_init()
192 	ac->psy_desc.properties = spwr_ac_props;  in spwr_ac_init()
193 	ac->psy_desc.num_properties = ARRAY_SIZE(spwr_ac_props);  in spwr_ac_init()
194 	ac->psy_desc.get_property = spwr_ac_get_property;  in spwr_ac_init()
204 	status = ssam_retry(ssam_bat_get_sta, ac->sdev, &sta);  in spwr_ac_register()
209 		return -ENODEV;  in spwr_ac_register()
215 	ac->psy = devm_power_supply_register(&ac->sdev->dev, &ac->psy_desc, &psy_cfg);  in spwr_ac_register()
216 	if (IS_ERR(ac->psy))  in spwr_ac_register()
217 		return PTR_ERR(ac->psy);  in spwr_ac_register()
219 	return ssam_device_notifier_register(ac->sdev, &ac->notif);  in spwr_ac_register()
223 /* -- Driver setup. --------------------------------------------------------- */
238 		return -ENODEV;  in surface_ac_probe()
240 	ac = devm_kzalloc(&sdev->dev, sizeof(*ac), GFP_KERNEL);  in surface_ac_probe()
242 		return -ENOMEM;  in surface_ac_probe()
244 	spwr_ac_init(ac, sdev, p->registry, p->name);  in surface_ac_probe()
254 	ssam_device_notifier_unregister(sdev, &ac->notif);  in surface_ac_remove()
263 	{ SSAM_SDEV(BAT, SAM, 0x01, 0x01), (unsigned long)&spwr_psy_props_adp1 },
281 MODULE_DESCRIPTION("AC driver for Surface System Aggregator Module");