3  * AC driver for 7th-generation Microsoft Surface devices via Surface System
67 static int spwr_ac_update_unlocked(struct spwr_ac_device *ac)  in spwr_ac_update_unlocked()  argument
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()
81 static int spwr_ac_update(struct spwr_ac_device *ac)  in spwr_ac_update()  argument
85 	mutex_lock(&ac->lock);  in spwr_ac_update()
86 	status = spwr_ac_update_unlocked(ac);  in spwr_ac_update()
87 	mutex_unlock(&ac->lock);  in spwr_ac_update()
92 static int spwr_ac_recheck(struct spwr_ac_device *ac)  in spwr_ac_recheck()  argument
96 	status = spwr_ac_update(ac);  in spwr_ac_recheck()
98 		power_supply_changed(ac->psy);  in spwr_ac_recheck()
105 	struct spwr_ac_device *ac;  in spwr_notify_ac()  local
108 	ac = container_of(nf, struct spwr_ac_device, notif);  in spwr_notify_ac()
110 	dev_dbg(&ac->sdev->dev, "power event (cid = %#04x, iid = %#04x, tid = %#04x)\n",  in spwr_notify_ac()
115 	 * seems to be handled via target=1 and instance=1, but events are  in spwr_notify_ac()
118 	 * While it should be enough to just listen on 1/1, listen everywhere to  in spwr_notify_ac()
124 		status = spwr_ac_recheck(ac);  in spwr_notify_ac()
142 	struct spwr_ac_device *ac = power_supply_get_drvdata(psy);  in spwr_ac_get_property()  local
145 	mutex_lock(&ac->lock);  in spwr_ac_get_property()
147 	status = spwr_ac_update_unlocked(ac);  in spwr_ac_get_property()
153 		val->intval = !!le32_to_cpu(ac->state);  in spwr_ac_get_property()
162 	mutex_unlock(&ac->lock);  in spwr_ac_get_property()
174 static void spwr_ac_init(struct spwr_ac_device *ac, struct ssam_device *sdev,  in spwr_ac_init()  argument
177 	mutex_init(&ac->lock);  in spwr_ac_init()
178 	strncpy(ac->name, name, ARRAY_SIZE(ac->name) - 1);  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()
197 static int spwr_ac_register(struct spwr_ac_device *ac)  in spwr_ac_register()  argument
204 	status = ssam_retry(ssam_bat_get_sta, ac->sdev, &sta);  in spwr_ac_register()
211 	psy_cfg.drv_data = ac;  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()
234 	struct spwr_ac_device *ac;  in surface_ac_probe()  local
240 	ac = devm_kzalloc(&sdev->dev, sizeof(*ac), GFP_KERNEL);  in surface_ac_probe()
241 	if (!ac)  in surface_ac_probe()
244 	spwr_ac_init(ac, sdev, p->registry, p->name);  in surface_ac_probe()
245 	ssam_device_set_drvdata(sdev, ac);  in surface_ac_probe()
247 	return spwr_ac_register(ac);  in surface_ac_probe()
252 	struct spwr_ac_device *ac = ssam_device_get_drvdata(sdev);  in surface_ac_remove()  local
254 	ssam_device_notifier_unregister(sdev, &ac->notif);  in surface_ac_remove()
281 MODULE_DESCRIPTION("AC driver for Surface System Aggregator Module");