2  * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver
4  * Copyright (c) 2017-2018 Hans de Goede <hdegoede@redhat.com>
27 #include <linux/extcon-provider.h>
30 #include <linux/usb/role.h>
34 #include <asm/intel-family.h>
60 /* BC USB status register */
145 	ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val);  in axp288_extcon_log_rsi()
148 			dev_dbg(info->dev, "%s\n", *rsi);  in axp288_extcon_log_rsi()
154 	regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask);  in axp288_extcon_log_rsi()
158  * The below code to control the USB role-switch on devices with an AXP288
160  * to control the USB role-switch on such devices:
161  * 1) On many devices the USB role is controlled by AML code, but the AML code
166  * 2) In order for our BC1.2 charger detection to work properly the role
170 /* Returns the id-pin value, note pulled low / false == host-mode */
173 	enum usb_role role;  in axp288_get_id_pin()  local
175 	if (info->id_extcon)  in axp288_get_id_pin()
176 		return extcon_get_state(info->id_extcon, EXTCON_USB_HOST) <= 0;  in axp288_get_id_pin()
178 	/* We cannot access the id-pin, see what mode the AML code has set */  in axp288_get_id_pin()
179 	role = usb_role_switch_get_role(info->role_sw);  in axp288_get_id_pin()
180 	return role != USB_ROLE_HOST;  in axp288_get_id_pin()
187 	enum usb_role role;  in axp288_usb_role_work()  local
193 		role = USB_ROLE_HOST;  in axp288_usb_role_work()
194 	else if (info->vbus_attach)  in axp288_usb_role_work()
195 		role = USB_ROLE_DEVICE;  in axp288_usb_role_work()
197 		role = USB_ROLE_NONE;  in axp288_usb_role_work()
199 	ret = usb_role_switch_set_role(info->role_sw, role);  in axp288_usb_role_work()
201 		dev_err(info->dev, "failed to set role: %d\n", ret);  in axp288_usb_role_work()
208 	ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat);  in axp288_get_vbus_attach()
210 		dev_err(info->dev, "failed to read vbus status\n");  in axp288_get_vbus_attach()
221 	unsigned int cable = info->previous_cable;  in axp288_handle_chrg_det_event()
229 	ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg);  in axp288_handle_chrg_det_event()
233 		dev_dbg(info->dev, "can't complete the charger detection\n");  in axp288_handle_chrg_det_event()
237 	ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat);  in axp288_handle_chrg_det_event()
243 	switch (chrg_type) {  in axp288_handle_chrg_det_event()
245 		dev_dbg(info->dev, "sdp cable is connected\n");  in axp288_handle_chrg_det_event()
249 		dev_dbg(info->dev, "cdp cable is connected\n");  in axp288_handle_chrg_det_event()
253 		dev_dbg(info->dev, "dcp cable is connected\n");  in axp288_handle_chrg_det_event()
257 		dev_warn(info->dev, "unknown (reserved) bc detect result\n");  in axp288_handle_chrg_det_event()
262 	extcon_set_state_sync(info->edev, info->previous_cable, false);  in axp288_handle_chrg_det_event()
263 	if (info->previous_cable == EXTCON_CHG_USB_SDP)  in axp288_handle_chrg_det_event()
264 		extcon_set_state_sync(info->edev, EXTCON_USB, false);  in axp288_handle_chrg_det_event()
267 		extcon_set_state_sync(info->edev, cable, vbus_attach);  in axp288_handle_chrg_det_event()
269 			extcon_set_state_sync(info->edev, EXTCON_USB,  in axp288_handle_chrg_det_event()
272 		info->previous_cable = cable;  in axp288_handle_chrg_det_event()
275 	if (info->role_sw && info->vbus_attach != vbus_attach) {  in axp288_handle_chrg_det_event()
276 		info->vbus_attach = vbus_attach;  in axp288_handle_chrg_det_event()
277 		/* Setting the role can take a while */  in axp288_handle_chrg_det_event()
278 		queue_work(system_long_wq, &info->role_work);  in axp288_handle_chrg_det_event()
285 		dev_err(info->dev, "failed to detect BC Mod\n");  in axp288_handle_chrg_det_event()
296 	/* We may not sleep and setting the role can take a while */  in axp288_extcon_id_evt()
297 	queue_work(system_long_wq, &info->role_work);  in axp288_extcon_id_evt()
309 		dev_err(info->dev, "failed to handle the interrupt\n");  in axp288_extcon_isr()
316 	regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,  in axp288_extcon_enable()
319 	regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,  in axp288_extcon_enable()
327 	cancel_work_sync(&info->role_work);  in axp288_put_role_sw()
328 	usb_role_switch_put(info->role_sw);  in axp288_put_role_sw()
334 	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);  in axp288_extcon_probe()
335 	struct device *dev = &pdev->dev;  in axp288_extcon_probe()
339 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);  in axp288_extcon_probe()
341 		return -ENOMEM;  in axp288_extcon_probe()
343 	info->dev = &pdev->dev;  in axp288_extcon_probe()
344 	info->regmap = axp20x->regmap;  in axp288_extcon_probe()
345 	info->regmap_irqc = axp20x->regmap_irqc;  in axp288_extcon_probe()
346 	info->previous_cable = EXTCON_NONE;  in axp288_extcon_probe()
347 	INIT_WORK(&info->role_work, axp288_usb_role_work);  in axp288_extcon_probe()
348 	info->id_nb.notifier_call = axp288_extcon_id_evt;  in axp288_extcon_probe()
352 	info->role_sw = usb_role_switch_get(dev);  in axp288_extcon_probe()
353 	if (IS_ERR(info->role_sw))  in axp288_extcon_probe()
354 		return PTR_ERR(info->role_sw);  in axp288_extcon_probe()
355 	if (info->role_sw) {  in axp288_extcon_probe()
360 		name = acpi_dev_get_first_match_name("INT3496", NULL, -1);  in axp288_extcon_probe()
362 			info->id_extcon = extcon_get_extcon_dev(name);  in axp288_extcon_probe()
363 			if (!info->id_extcon)  in axp288_extcon_probe()
364 				return -EPROBE_DEFER;  in axp288_extcon_probe()
366 			dev_info(dev, "controlling USB role\n");  in axp288_extcon_probe()
368 			dev_info(dev, "controlling USB role based on Vbus presence\n");  in axp288_extcon_probe()
372 	info->vbus_attach = axp288_get_vbus_attach(info);  in axp288_extcon_probe()
377 	info->edev = devm_extcon_dev_allocate(&pdev->dev,  in axp288_extcon_probe()
379 	if (IS_ERR(info->edev)) {  in axp288_extcon_probe()
380 		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");  in axp288_extcon_probe()
381 		return PTR_ERR(info->edev);  in axp288_extcon_probe()
385 	ret = devm_extcon_dev_register(&pdev->dev, info->edev);  in axp288_extcon_probe()
387 		dev_err(&pdev->dev, "failed to register extcon device\n");  in axp288_extcon_probe()
396 		info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);  in axp288_extcon_probe()
397 		if (info->irq[i] < 0) {  in axp288_extcon_probe()
398 			dev_err(&pdev->dev,  in axp288_extcon_probe()
400 			ret = info->irq[i];  in axp288_extcon_probe()
404 		ret = devm_request_threaded_irq(&pdev->dev, info->irq[i],  in axp288_extcon_probe()
407 				pdev->name, info);  in axp288_extcon_probe()
409 			dev_err(&pdev->dev, "failed to request interrupt=%d\n",  in axp288_extcon_probe()
410 							info->irq[i]);  in axp288_extcon_probe()
415 	if (info->id_extcon) {  in axp288_extcon_probe()
416 		ret = devm_extcon_register_notifier_all(dev, info->id_extcon,  in axp288_extcon_probe()
417 							&info->id_nb);  in axp288_extcon_probe()
422 	/* Make sure the role-sw is set correctly before doing BC detection */  in axp288_extcon_probe()
423 	if (info->role_sw) {  in axp288_extcon_probe()
424 		queue_work(system_long_wq, &info->role_work);  in axp288_extcon_probe()
425 		flush_work(&info->role_work);  in axp288_extcon_probe()
442 		enable_irq_wake(info->irq[VBUS_RISING_IRQ]);  in axp288_extcon_suspend()
452 	 * Wakeup when a charger is connected to do charger-type  in axp288_extcon_resume()
457 		disable_irq_wake(info->irq[VBUS_RISING_IRQ]);  in axp288_extcon_resume()
482 	.endpoint[1] = "intel_xhci_usb_sw-role-switch",
483 	.id = "usb-role-switch",
506 MODULE_DESCRIPTION("X-Powers AXP288 extcon driver");