1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * cros_ec_dev - expose the Chrome OS Embedded Controller to user-space
19 #define DRV_NAME "cros-ec-dev"
27  * struct cros_feature_to_name - CrOS feature id to name/short description.
39  * struct cros_feature_to_cells - CrOS feature id to mfd cells association.
74 	{ .name = "cros-ec-cec", },
78 	{ .name = "cros-ec-rtc", },
82 	{ .name = "cros-ec-sensorhub", },
86 	{ .name = "cros-usbpd-charger", },
87 	{ .name = "cros-usbpd-logger", },
91 	{ .name = "cros-usbpd-notify", },
113 	{ .name = "cros-ec-chardev", },
114 	{ .name = "cros-ec-debugfs", },
115 	{ .name = "cros-ec-lightbar", },
116 	{ .name = "cros-ec-sysfs", },
120 	{ .name = "cros-ec-vbc", }
130 	int retval = -ENOMEM;  in ec_device_probe()
132 	struct device *dev = &pdev->dev;  in ec_device_probe()
134 	struct cros_ec_dev *ec = kzalloc(sizeof(*ec), GFP_KERNEL);  in ec_device_probe()  local
137 	if (!ec)  in ec_device_probe()
140 	dev_set_drvdata(dev, ec);  in ec_device_probe()
141 	ec->ec_dev = dev_get_drvdata(dev->parent);  in ec_device_probe()
142 	ec->dev = dev;  in ec_device_probe()
143 	ec->cmd_offset = ec_platform->cmd_offset;  in ec_device_probe()
144 	ec->features[0] = -1U; /* Not cached yet */  in ec_device_probe()
145 	ec->features[1] = -1U; /* Not cached yet */  in ec_device_probe()
146 	device_initialize(&ec->class_dev);  in ec_device_probe()
151 		 * than an standard EC.  in ec_device_probe()
153 		if (cros_ec_check_features(ec, cros_mcu_devices[i].id)) {  in ec_device_probe()
154 			dev_info(dev, "CrOS %s MCU detected\n",  in ec_device_probe()
160 			ec_platform->ec_name = cros_mcu_devices[i].name;  in ec_device_probe()
168 	ec->class_dev.class = &cros_class;  in ec_device_probe()
169 	ec->class_dev.parent = dev;  in ec_device_probe()
170 	ec->class_dev.release = cros_ec_class_release;  in ec_device_probe()
172 	retval = dev_set_name(&ec->class_dev, "%s", ec_platform->ec_name);  in ec_device_probe()
178 	retval = device_add(&ec->class_dev);  in ec_device_probe()
182 	/* check whether this EC is a sensor hub. */  in ec_device_probe()
183 	if (cros_ec_get_sensor_count(ec) > 0) {  in ec_device_probe()
184 		retval = mfd_add_hotplug_devices(ec->dev,  in ec_device_probe()
188 			dev_err(ec->dev, "failed to add %s subdevice: %d\n",  in ec_device_probe()
189 				cros_ec_sensorhub_cells->name, retval);  in ec_device_probe()
197 		if (cros_ec_check_features(ec, cros_subdevices[i].id)) {  in ec_device_probe()
198 			retval = mfd_add_hotplug_devices(ec->dev,  in ec_device_probe()
202 				dev_err(ec->dev,  in ec_device_probe()
204 					cros_subdevices[i].mfd_cells->name,  in ec_device_probe()
214 	if (IS_ENABLED(CONFIG_OF) && ec->ec_dev->dev->of_node) {  in ec_device_probe()
215 		if (cros_ec_check_features(ec, EC_FEATURE_USB_PD)) {  in ec_device_probe()
216 			retval = mfd_add_hotplug_devices(ec->dev,  in ec_device_probe()
220 				dev_err(ec->dev,  in ec_device_probe()
230 	retval = mfd_add_hotplug_devices(ec->dev, cros_ec_platform_cells,  in ec_device_probe()
233 		dev_warn(ec->dev,  in ec_device_probe()
234 			 "failed to add cros-ec platform devices: %d\n",  in ec_device_probe()
237 	/* Check whether this EC instance has a VBC NVRAM */  in ec_device_probe()
238 	node = ec->ec_dev->dev->of_node;  in ec_device_probe()
239 	if (of_property_read_bool(node, "google,has-vbc-nvram")) {  in ec_device_probe()
240 		retval = mfd_add_hotplug_devices(ec->dev, cros_ec_vbc_cells,  in ec_device_probe()
243 			dev_warn(ec->dev, "failed to add VBC devices: %d\n",  in ec_device_probe()
250 	put_device(&ec->class_dev);  in ec_device_probe()
256 	struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev);  in ec_device_remove()  local
258 	mfd_remove_devices(ec->dev);  in ec_device_remove()
259 	device_unregister(&ec->class_dev);  in ec_device_remove()