1 // SPDX-License-Identifier: GPL-2.0+
3 // extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC
15 #include <linux/mfd/max14577-private.h>
16 #include <linux/extcon-provider.h>
46 	{ MAX14577_IRQ_INT1_ADC,	"muic-ADC" },
47 	{ MAX14577_IRQ_INT1_ADCLOW,	"muic-ADCLOW" },
48 	{ MAX14577_IRQ_INT1_ADCERR,	"muic-ADCError" },
49 	{ MAX14577_IRQ_INT2_CHGTYP,	"muic-CHGTYP" },
50 	{ MAX14577_IRQ_INT2_CHGDETRUN,	"muic-CHGDETRUN" },
51 	{ MAX14577_IRQ_INT2_DCDTMR,	"muic-DCDTMR" },
52 	{ MAX14577_IRQ_INT2_DBCHG,	"muic-DBCHG" },
53 	{ MAX14577_IRQ_INT2_VBVOLT,	"muic-VBVOLT" },
57 	{ MAX14577_IRQ_INT1_ADC,	"muic-ADC" },
58 	{ MAX14577_IRQ_INT1_ADCLOW,	"muic-ADCLOW" },
59 	{ MAX14577_IRQ_INT1_ADCERR,	"muic-ADCError" },
60 	{ MAX77836_IRQ_INT1_ADC1K,	"muic-ADC1K" },
61 	{ MAX14577_IRQ_INT2_CHGTYP,	"muic-CHGTYP" },
62 	{ MAX14577_IRQ_INT2_CHGDETRUN,	"muic-CHGDETRUN" },
63 	{ MAX14577_IRQ_INT2_DCDTMR,	"muic-DCDTMR" },
64 	{ MAX14577_IRQ_INT2_DBCHG,	"muic-DBCHG" },
65 	{ MAX14577_IRQ_INT2_VBVOLT,	"muic-VBVOLT" },
66 	{ MAX77836_IRQ_INT2_VIDRM,	"muic-VIDRM" },
85 	 * Use delayed workqueue to detect cable state and then
86 	 * notify cable state to notifiee/platform through uevent.
88 	 * driver should notify cable state to upper layer.
93 	 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
94 	 * h/w path of COMP2/COMN1 on CONTROL1 register.
153  * max14577_muic_set_debounce_time - Set the debounce time of ADC
167 		ret = max14577_update_reg(info->max14577->regmap,  in max14577_muic_set_debounce_time()
172 			dev_err(info->dev, "failed to set ADC debounce time\n");  in max14577_muic_set_debounce_time()
177 		dev_err(info->dev, "invalid ADC debounce time\n");  in max14577_muic_set_debounce_time()
178 		return -EINVAL;  in max14577_muic_set_debounce_time()
185  * max14577_muic_set_path - Set hardware line according to attached cable
188  * @attached: the state of cable (true:attached, false:detached)
190  * The max14577 MUIC device share outside H/W line among a varity of cables
191  * so, this function set internal path of H/W line according to the type of
200 	/* Set open state to path before changing hw path */  in max14577_muic_set_path()
201 	ret = max14577_update_reg(info->max14577->regmap,  in max14577_muic_set_path()
205 		dev_err(info->dev, "failed to update MUIC register\n");  in max14577_muic_set_path()
214 	ret = max14577_update_reg(info->max14577->regmap,  in max14577_muic_set_path()
218 		dev_err(info->dev, "failed to update MUIC register\n");  in max14577_muic_set_path()
227 	ret = max14577_update_reg(info->max14577->regmap,  in max14577_muic_set_path()
231 		dev_err(info->dev, "failed to update MUIC register\n");  in max14577_muic_set_path()
235 	dev_dbg(info->dev,  in max14577_muic_set_path()
236 		"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",  in max14577_muic_set_path()
243  * max14577_muic_get_cable_type - Return cable type and check cable state
246  * @attached: store cable state and return
248  * This function check the cable state either attached or detached,
250  *	- max14577_CABLE_GROUP_ADC
251  *	- max14577_CABLE_GROUP_CHG
263 		 * Read ADC value to check cable type and decide cable state  in max14577_muic_get_cable_type()
266 		adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK;  in max14577_muic_get_cable_type()
270 		 * Check current cable state/cable type and store cable type  in max14577_muic_get_cable_type()
271 		 * (info->prev_cable_type) for handling cable when cable is  in max14577_muic_get_cable_type()
277 			cable_type = info->prev_cable_type;  in max14577_muic_get_cable_type()
278 			info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;  in max14577_muic_get_cable_type()
282 			cable_type = info->prev_cable_type = adc;  in max14577_muic_get_cable_type()
287 		 * Read charger type to check cable type and decide cable state  in max14577_muic_get_cable_type()
290 		chg_type = info->status[MAX14577_MUIC_STATUS2] &  in max14577_muic_get_cable_type()
297 			cable_type = info->prev_chg_type;  in max14577_muic_get_cable_type()
298 			info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;  in max14577_muic_get_cable_type()
303 			 * Check current cable state/cable type and store cable  in max14577_muic_get_cable_type()
304 			 * type(info->prev_chg_type) for handling cable when  in max14577_muic_get_cable_type()
307 			cable_type = info->prev_chg_type = chg_type;  in max14577_muic_get_cable_type()
312 		dev_err(info->dev, "Unknown cable group (%d)\n", group);  in max14577_muic_get_cable_type()
313 		cable_type = -EINVAL;  in max14577_muic_get_cable_type()
326 	dev_dbg(info->dev,  in max14577_muic_jig_handler()
341 		dev_err(info->dev, "failed to detect %s jig cable\n",  in max14577_muic_jig_handler()
343 		return -EINVAL;  in max14577_muic_jig_handler()
350 	extcon_set_state_sync(info->edev, EXTCON_JIG, attached);  in max14577_muic_jig_handler()
361 	/* Check accessory state which is either detached or attached */  in max14577_muic_adc_handler()
365 	dev_dbg(info->dev,  in max14577_muic_adc_handler()
368 		info->prev_cable_type);  in max14577_muic_adc_handler()
412 		dev_info(info->dev,  in max14577_muic_adc_handler()
415 		return -EAGAIN;  in max14577_muic_adc_handler()
417 		dev_err(info->dev,  in max14577_muic_adc_handler()
420 		return -EINVAL;  in max14577_muic_adc_handler()
435 	dev_dbg(info->dev,  in max14577_muic_chg_handler()
438 			chg_type, info->prev_chg_type);  in max14577_muic_chg_handler()
443 		ret = max14577_muic_set_path(info, info->path_usb, attached);  in max14577_muic_chg_handler()
447 		extcon_set_state_sync(info->edev, EXTCON_USB, attached);  in max14577_muic_chg_handler()
448 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,  in max14577_muic_chg_handler()
452 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,  in max14577_muic_chg_handler()
456 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,  in max14577_muic_chg_handler()
460 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,  in max14577_muic_chg_handler()
464 		extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,  in max14577_muic_chg_handler()
471 		dev_err(info->dev,  in max14577_muic_chg_handler()
474 		return -EINVAL;  in max14577_muic_chg_handler()
486 	if (!info->edev)  in max14577_muic_irq_work()
489 	mutex_lock(&info->mutex);  in max14577_muic_irq_work()
491 	ret = max14577_bulk_read(info->max14577->regmap,  in max14577_muic_irq_work()
492 			MAX14577_MUIC_REG_STATUS1, info->status, 2);  in max14577_muic_irq_work()
494 		dev_err(info->dev, "failed to read MUIC register\n");  in max14577_muic_irq_work()
495 		mutex_unlock(&info->mutex);  in max14577_muic_irq_work()
499 	if (info->irq_adc) {  in max14577_muic_irq_work()
501 		info->irq_adc = false;  in max14577_muic_irq_work()
503 	if (info->irq_chg) {  in max14577_muic_irq_work()
505 		info->irq_chg = false;  in max14577_muic_irq_work()
509 		dev_err(info->dev, "failed to handle MUIC interrupt\n");  in max14577_muic_irq_work()
511 	mutex_unlock(&info->mutex);  in max14577_muic_irq_work()
528 		info->irq_adc = true;  in max14577_parse_irq()
536 		info->irq_chg = true;  in max14577_parse_irq()
555 		info->irq_adc = true;  in max77836_parse_irq()
559 		info->irq_chg = true;  in max77836_parse_irq()
569 	int i, irq_type = -1;  in max14577_muic_irq_handler()
573 	 * We may be called multiple times for different nested IRQ-s.  in max14577_muic_irq_handler()
578 	for (i = 0; i < info->muic_irqs_num; i++)  in max14577_muic_irq_handler()
579 		if (irq == info->muic_irqs[i].virq)  in max14577_muic_irq_handler()
580 			irq_type = info->muic_irqs[i].irq;  in max14577_muic_irq_handler()
582 	switch (info->max14577->dev_type) {  in max14577_muic_irq_handler()
593 		dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",  in max14577_muic_irq_handler()
597 	schedule_work(&info->irq_work);  in max14577_muic_irq_handler()
609 	mutex_lock(&info->mutex);  in max14577_muic_detect_accessory()
612 	ret = max14577_bulk_read(info->max14577->regmap,  in max14577_muic_detect_accessory()
613 			MAX14577_MUIC_REG_STATUS1, info->status, 2);  in max14577_muic_detect_accessory()
615 		dev_err(info->dev, "failed to read MUIC register\n");  in max14577_muic_detect_accessory()
616 		mutex_unlock(&info->mutex);  in max14577_muic_detect_accessory()
625 			dev_err(info->dev, "Cannot detect accessory\n");  in max14577_muic_detect_accessory()
626 			mutex_unlock(&info->mutex);  in max14577_muic_detect_accessory()
636 			dev_err(info->dev, "Cannot detect charger accessory\n");  in max14577_muic_detect_accessory()
637 			mutex_unlock(&info->mutex);  in max14577_muic_detect_accessory()
642 	mutex_unlock(&info->mutex);  in max14577_muic_detect_accessory()
657 	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);  in max14577_muic_probe()
666 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);  in max14577_muic_probe()
668 		return -ENOMEM;  in max14577_muic_probe()
670 	info->dev = &pdev->dev;  in max14577_muic_probe()
671 	info->max14577 = max14577;  in max14577_muic_probe()
674 	mutex_init(&info->mutex);  in max14577_muic_probe()
676 	INIT_WORK(&info->irq_work, max14577_muic_irq_work);  in max14577_muic_probe()
678 	switch (max14577->dev_type) {  in max14577_muic_probe()
680 		info->muic_irqs = max77836_muic_irqs;  in max14577_muic_probe()
681 		info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs);  in max14577_muic_probe()
685 		info->muic_irqs = max14577_muic_irqs;  in max14577_muic_probe()
686 		info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs);  in max14577_muic_probe()
690 	for (i = 0; i < info->muic_irqs_num; i++) {  in max14577_muic_probe()
691 		struct max14577_muic_irq *muic_irq = &info->muic_irqs[i];  in max14577_muic_probe()
694 		virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);  in max14577_muic_probe()
696 			return -EINVAL;  in max14577_muic_probe()
697 		muic_irq->virq = virq;  in max14577_muic_probe()
699 		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,  in max14577_muic_probe()
702 				muic_irq->name, info);  in max14577_muic_probe()
704 			dev_err(&pdev->dev,  in max14577_muic_probe()
706 				muic_irq->irq, ret);  in max14577_muic_probe()
712 	info->edev = devm_extcon_dev_allocate(&pdev->dev,  in max14577_muic_probe()
714 	if (IS_ERR(info->edev)) {  in max14577_muic_probe()
715 		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");  in max14577_muic_probe()
716 		return PTR_ERR(info->edev);  in max14577_muic_probe()
719 	ret = devm_extcon_dev_register(&pdev->dev, info->edev);  in max14577_muic_probe()
721 		dev_err(&pdev->dev, "failed to register extcon device\n");  in max14577_muic_probe()
725 	/* Default h/w line path */  in max14577_muic_probe()
726 	info->path_usb = CTRL1_SW_USB;  in max14577_muic_probe()
727 	info->path_uart = CTRL1_SW_UART;  in max14577_muic_probe()
730 	/* Set initial path for UART when JIG is connected to get serial logs */  in max14577_muic_probe()
731 	ret = max14577_bulk_read(info->max14577->regmap,  in max14577_muic_probe()
732 			MAX14577_MUIC_REG_STATUS1, info->status, 2);  in max14577_muic_probe()
734 		dev_err(info->dev, "Cannot read STATUS registers\n");  in max14577_muic_probe()
740 		max14577_muic_set_path(info, info->path_uart, true);  in max14577_muic_probe()
743 	ret = max14577_read_reg(info->max14577->regmap,  in max14577_muic_probe()
746 		dev_err(&pdev->dev, "failed to read revision number\n");  in max14577_muic_probe()
749 	dev_info(info->dev, "device ID : 0x%x\n", id);  in max14577_muic_probe()
757 	 * - Use delayed workqueue to detect cable state and then  in max14577_muic_probe()
758 	 * notify cable state to notifiee/platform through uevent.  in max14577_muic_probe()
760 	 * driver should notify cable state to upper layer.  in max14577_muic_probe()
762 	INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);  in max14577_muic_probe()
763 	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,  in max14577_muic_probe()
773 	cancel_work_sync(&info->irq_work);  in max14577_muic_remove()
779 	{ "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, },
780 	{ "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, },
786 	{ .compatible = "maxim,max14577-muic",
788 	{ .compatible = "maxim,max77836-muic",
796 		.name	= "max14577-muic",
809 MODULE_ALIAS("platform:extcon-max14577");