1 // SPDX-License-Identifier: GPL-2.0+
6  *  Author: Wei-Ning Huang <wnhuang@google.com>
26 #include "hid-ids.h"
29  * C(hrome)B(ase)A(ttached)S(witch) - switch exported by Chrome EC and reporting
30  * state of the "Whiskers" base - attached or detached. Whiskers USB device also
31  * reports position of the keyboard - folded or not. Combining base state and
32  * position allows us to generate proper "Tablet mode" events.
63 		return -ENOMEM;  in cbas_ec_query_base()
65 	msg->command = EC_CMD_MKBP_INFO;  in cbas_ec_query_base()
66 	msg->version = 1;  in cbas_ec_query_base()
67 	msg->outsize = sizeof(*params);  in cbas_ec_query_base()
68 	msg->insize = sizeof(u32);  in cbas_ec_query_base()
69 	params = (struct ec_params_mkbp_info *)msg->data;  in cbas_ec_query_base()
70 	params->info_type = get_state ?  in cbas_ec_query_base()
72 	params->event_type = EC_MKBP_EVENT_SWITCH;  in cbas_ec_query_base()
77 			dev_warn(ec_dev->dev, "wrong result size: %d != %zu\n",  in cbas_ec_query_base()
79 			ret = -EPROTO;  in cbas_ec_query_base()
81 			*state = cbas_parse_base_state(msg->data);  in cbas_ec_query_base()
99 	if (ec->event_data.event_type == EC_MKBP_EVENT_SWITCH) {  in cbas_ec_notify()
101 					&ec->event_data.data.switches);  in cbas_ec_notify()
136 	struct cros_ec_device *ec = dev_get_drvdata(dev->parent);  in cbas_ec_resume()
177 	struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);  in __cbas_ec_probe()
187 		return -ENXIO;  in __cbas_ec_probe()
189 	input = devm_input_allocate_device(&pdev->dev);  in __cbas_ec_probe()
191 		return -ENOMEM;  in __cbas_ec_probe()
193 	input->name = "Whiskers Tablet Mode Switch";  in __cbas_ec_probe()
194 	input->id.bustype = BUS_HOST;  in __cbas_ec_probe()
200 		dev_err(&pdev->dev, "cannot register input device: %d\n",  in __cbas_ec_probe()
208 		dev_err(&pdev->dev, "cannot query base state: %d\n", error);  in __cbas_ec_probe()
215 	dev_dbg(&pdev->dev, "%s: base: %d, folded: %d\n", __func__,  in __cbas_ec_probe()
223 	cbas_ec.dev = &pdev->dev;  in __cbas_ec_probe()
225 	error = blocking_notifier_chain_register(&ec->event_notifier,  in __cbas_ec_probe()
228 		dev_err(&pdev->dev, "cannot register notifier: %d\n", error);  in __cbas_ec_probe()
233 	device_init_wakeup(&pdev->dev, true);  in __cbas_ec_probe()
244 		retval = -EBUSY;  in cbas_ec_probe()
257 	struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);  in cbas_ec_remove()
261 	blocking_notifier_chain_unregister(&ec->event_notifier,  in cbas_ec_remove()
301 	led->buf[0] = 0;  in hammer_kbd_brightness_set_blocking()
302 	led->buf[1] = br;  in hammer_kbd_brightness_set_blocking()
305 	 * Request USB HID device to be in Full On mode, so that sending  in hammer_kbd_brightness_set_blocking()
308 	ret = hid_hw_power(led->hdev, PM_HINT_FULLON);  in hammer_kbd_brightness_set_blocking()
310 		hid_err(led->hdev, "failed: device not resumed %d\n", ret);  in hammer_kbd_brightness_set_blocking()
314 	ret = hid_hw_output_report(led->hdev, led->buf, sizeof(led->buf));  in hammer_kbd_brightness_set_blocking()
315 	if (ret == -ENOSYS)  in hammer_kbd_brightness_set_blocking()
316 		ret = hid_hw_raw_request(led->hdev, 0, led->buf,  in hammer_kbd_brightness_set_blocking()
317 					 sizeof(led->buf),  in hammer_kbd_brightness_set_blocking()
321 		hid_err(led->hdev, "failed to set keyboard backlight: %d\n",  in hammer_kbd_brightness_set_blocking()
324 	/* Request USB HID device back to Normal Mode. */  in hammer_kbd_brightness_set_blocking()
325 	hid_hw_power(led->hdev, PM_HINT_NORMAL);  in hammer_kbd_brightness_set_blocking()
337 		return -ENOMEM;  in hammer_register_leds()
339 	kbd_backlight->hdev = hdev;  in hammer_register_leds()
340 	kbd_backlight->cdev.name = "hammer::kbd_backlight";  in hammer_register_leds()
341 	kbd_backlight->cdev.max_brightness = MAX_BRIGHTNESS;  in hammer_register_leds()
342 	kbd_backlight->cdev.brightness_set_blocking =  in hammer_register_leds()
344 	kbd_backlight->cdev.flags = LED_HW_PLUGGABLE;  in hammer_register_leds()
347 	hammer_kbd_brightness_set_blocking(&kbd_backlight->cdev, 0);  in hammer_register_leds()
349 	error = led_classdev_register(&hdev->dev, &kbd_backlight->cdev);  in hammer_register_leds()
366 		led_classdev_unregister(&kbd_backlight->cdev);  in hammer_unregister_leds()
383 	if (usage->hid == HID_USAGE_KBD_FOLDED) {  in hammer_input_mapping()
387 		 * separate input device for tablet switch mode.  in hammer_input_mapping()
389 		return -1;  in hammer_input_mapping()
400 	if (usage->hid == HID_USAGE_KBD_FOLDED) {  in hammer_event()
428 	struct hid_report_enum *re = &hdev->report_enum[report_type];  in hammer_has_usage()
432 	list_for_each_entry(report, &re->report_list, list) {  in hammer_has_usage()
433 		if (report->application != application)  in hammer_has_usage()
436 		for (i = 0; i < report->maxfield; i++) {  in hammer_has_usage()
437 			struct hid_field *field = report->field[i];  in hammer_has_usage()
439 			for (j = 0; j < field->maxusage; j++)  in hammer_has_usage()
440 				if (field->usage[j].hid == usage)  in hammer_has_usage()
474 	 * We always want to poll for, and handle tablet mode events from  in hammer_probe()
476 	 * device. This also prevents the hid core from dropping early tablet  in hammer_probe()
477 	 * mode events from the device.  in hammer_probe()
480 		hdev->quirks |= HID_QUIRK_ALWAYS_POLL;  in hammer_probe()
507 		 * keyboard we should not stay in clamshell mode.  in hammer_remove()
512 		 * resulting in devices being stuck in clamshell mode.  in hammer_remove()