1 // SPDX-License-Identifier: GPL-2.0-only
3  * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver
5  * Copyright (c) 2017-2018 Hans de Goede <hdegoede@redhat.com>
19 #include <linux/extcon-provider.h>
22 #include <linux/usb/role.h>
26 #include <asm/intel-family.h>
136 	ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val);  in axp288_extcon_log_rsi()
138 		dev_err(info->dev, "failed to read reset source indicator\n");  in axp288_extcon_log_rsi()
142 	bits = val & GENMASK(ARRAY_SIZE(axp288_pwr_up_down_info) - 1, 0);  in axp288_extcon_log_rsi()
144 		dev_dbg(info->dev, "%s\n", axp288_pwr_up_down_info[i]);  in axp288_extcon_log_rsi()
148 	regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask);  in axp288_extcon_log_rsi()
152  * The below code to control the USB role-switch on devices with an AXP288
154  * to control the USB role-switch on such devices:
155  * 1) On many devices the USB role is controlled by AML code, but the AML code
160  * 2) In order for our BC1.2 charger detection to work properly the role
164 /* Returns the id-pin value, note pulled low / false == host-mode */
167 	enum usb_role role;  in axp288_get_id_pin()  local
169 	if (info->id_extcon)  in axp288_get_id_pin()
170 		return extcon_get_state(info->id_extcon, EXTCON_USB_HOST) <= 0;  in axp288_get_id_pin()
172 	/* We cannot access the id-pin, see what mode the AML code has set */  in axp288_get_id_pin()
173 	role = usb_role_switch_get_role(info->role_sw);  in axp288_get_id_pin()
174 	return role != USB_ROLE_HOST;  in axp288_get_id_pin()
181 	enum usb_role role;  in axp288_usb_role_work()  local
187 		role = USB_ROLE_HOST;  in axp288_usb_role_work()
188 	else if (info->vbus_attach)  in axp288_usb_role_work()
189 		role = USB_ROLE_DEVICE;  in axp288_usb_role_work()
191 		role = USB_ROLE_NONE;  in axp288_usb_role_work()
193 	ret = usb_role_switch_set_role(info->role_sw, role);  in axp288_usb_role_work()
195 		dev_err(info->dev, "failed to set role: %d\n", ret);  in axp288_usb_role_work()
202 	ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat);  in axp288_get_vbus_attach()
204 		dev_err(info->dev, "failed to read vbus status\n");  in axp288_get_vbus_attach()
215 	unsigned int cable = info->previous_cable;  in axp288_handle_chrg_det_event()
223 	ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg);  in axp288_handle_chrg_det_event()
227 		dev_dbg(info->dev, "can't complete the charger detection\n");  in axp288_handle_chrg_det_event()
231 	ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat);  in axp288_handle_chrg_det_event()
239 		dev_dbg(info->dev, "sdp cable is connected\n");  in axp288_handle_chrg_det_event()
243 		dev_dbg(info->dev, "cdp cable is connected\n");  in axp288_handle_chrg_det_event()
247 		dev_dbg(info->dev, "dcp cable is connected\n");  in axp288_handle_chrg_det_event()
251 		dev_warn(info->dev, "unknown (reserved) bc detect result\n");  in axp288_handle_chrg_det_event()
256 	extcon_set_state_sync(info->edev, info->previous_cable, false);  in axp288_handle_chrg_det_event()
257 	if (info->previous_cable == EXTCON_CHG_USB_SDP)  in axp288_handle_chrg_det_event()
258 		extcon_set_state_sync(info->edev, EXTCON_USB, false);  in axp288_handle_chrg_det_event()
261 		extcon_set_state_sync(info->edev, cable, vbus_attach);  in axp288_handle_chrg_det_event()
263 			extcon_set_state_sync(info->edev, EXTCON_USB,  in axp288_handle_chrg_det_event()
266 		info->previous_cable = cable;  in axp288_handle_chrg_det_event()
269 	if (info->role_sw && info->vbus_attach != vbus_attach) {  in axp288_handle_chrg_det_event()
270 		info->vbus_attach = vbus_attach;  in axp288_handle_chrg_det_event()
271 		/* Setting the role can take a while */  in axp288_handle_chrg_det_event()
272 		queue_work(system_long_wq, &info->role_work);  in axp288_handle_chrg_det_event()
279 		dev_err(info->dev, "failed to detect BC Mod\n");  in axp288_handle_chrg_det_event()
290 	/* We may not sleep and setting the role can take a while */  in axp288_extcon_id_evt()
291 	queue_work(system_long_wq, &info->role_work);  in axp288_extcon_id_evt()
296 static irqreturn_t axp288_extcon_isr(int irq, void *data)  in axp288_extcon_isr()  argument
298 	struct axp288_extcon_info *info = data;  in axp288_extcon_isr()
303 		dev_err(info->dev, "failed to handle the interrupt\n");  in axp288_extcon_isr()
310 	regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,  in axp288_extcon_enable()
313 	regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,  in axp288_extcon_enable()
317 static void axp288_put_role_sw(void *data)  in axp288_put_role_sw()  argument
319 	struct axp288_extcon_info *info = data;  in axp288_put_role_sw()
321 	cancel_work_sync(&info->role_work);  in axp288_put_role_sw()
322 	usb_role_switch_put(info->role_sw);  in axp288_put_role_sw()
333 	swnode = software_node_find_by_name(NULL, "intel-xhci-usb-sw");  in axp288_extcon_find_role_sw()
335 		return -EPROBE_DEFER;  in axp288_extcon_find_role_sw()
338 	info->role_sw = usb_role_switch_find_by_fwnode(fwnode);  in axp288_extcon_find_role_sw()
341 	return info->role_sw ? 0 : -EPROBE_DEFER;  in axp288_extcon_find_role_sw()
347 	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);  in axp288_extcon_probe()
348 	struct device *dev = &pdev->dev;  in axp288_extcon_probe()
352 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);  in axp288_extcon_probe()
354 		return -ENOMEM;  in axp288_extcon_probe()
356 	info->dev = &pdev->dev;  in axp288_extcon_probe()
357 	info->regmap = axp20x->regmap;  in axp288_extcon_probe()
358 	info->regmap_irqc = axp20x->regmap_irqc;  in axp288_extcon_probe()
359 	info->previous_cable = EXTCON_NONE;  in axp288_extcon_probe()
360 	INIT_WORK(&info->role_work, axp288_usb_role_work);  in axp288_extcon_probe()
361 	info->id_nb.notifier_call = axp288_extcon_id_evt;  in axp288_extcon_probe()
369 	if (info->role_sw) {  in axp288_extcon_probe()
374 		adev = acpi_dev_get_first_match_dev("INT3496", NULL, -1);  in axp288_extcon_probe()
376 			info->id_extcon = extcon_get_extcon_dev(acpi_dev_name(adev));  in axp288_extcon_probe()
377 			put_device(&adev->dev);  in axp288_extcon_probe()
378 			if (!info->id_extcon)  in axp288_extcon_probe()
379 				return -EPROBE_DEFER;  in axp288_extcon_probe()
381 			dev_info(dev, "controlling USB role\n");  in axp288_extcon_probe()
383 			dev_info(dev, "controlling USB role based on Vbus presence\n");  in axp288_extcon_probe()
387 	info->vbus_attach = axp288_get_vbus_attach(info);  in axp288_extcon_probe()
392 	info->edev = devm_extcon_dev_allocate(&pdev->dev,  in axp288_extcon_probe()
394 	if (IS_ERR(info->edev)) {  in axp288_extcon_probe()
395 		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");  in axp288_extcon_probe()
396 		return PTR_ERR(info->edev);  in axp288_extcon_probe()
400 	ret = devm_extcon_dev_register(&pdev->dev, info->edev);  in axp288_extcon_probe()
402 		dev_err(&pdev->dev, "failed to register extcon device\n");  in axp288_extcon_probe()
411 		info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);  in axp288_extcon_probe()
412 		if (info->irq[i] < 0) {  in axp288_extcon_probe()
413 			dev_err(&pdev->dev,  in axp288_extcon_probe()
415 			ret = info->irq[i];  in axp288_extcon_probe()
419 		ret = devm_request_threaded_irq(&pdev->dev, info->irq[i],  in axp288_extcon_probe()
422 				pdev->name, info);  in axp288_extcon_probe()
424 			dev_err(&pdev->dev, "failed to request interrupt=%d\n",  in axp288_extcon_probe()
425 							info->irq[i]);  in axp288_extcon_probe()
430 	if (info->id_extcon) {  in axp288_extcon_probe()
431 		ret = devm_extcon_register_notifier_all(dev, info->id_extcon,  in axp288_extcon_probe()
432 							&info->id_nb);  in axp288_extcon_probe()
437 	/* Make sure the role-sw is set correctly before doing BC detection */  in axp288_extcon_probe()
438 	if (info->role_sw) {  in axp288_extcon_probe()
439 		queue_work(system_long_wq, &info->role_work);  in axp288_extcon_probe()
440 		flush_work(&info->role_work);  in axp288_extcon_probe()
457 		enable_irq_wake(info->irq[VBUS_RISING_IRQ]);  in axp288_extcon_suspend()
467 	 * Wakeup when a charger is connected to do charger-type  in axp288_extcon_resume()
472 		disable_irq_wake(info->irq[VBUS_RISING_IRQ]);  in axp288_extcon_resume()
498 MODULE_DESCRIPTION("X-Powers AXP288 extcon driver");