[linux-2.6-block.git] / drivers / extcon / extcon-palmas.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Palmas USB transceiver driver
 *
 * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
 * Author: Graeme Gregory <gg@slimlogic.co.uk>
 * Author: Kishon Vijay Abraham I <kishon@ti.com>
 * Based on twl6030_usb.c
 * Author: Hema HK <hemahk@ti.com>
 */

#include <linux/devm-helpers.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/mfd/palmas.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/gpio/consumer.h>
#include <linux/workqueue.h>

#define USB_GPIO_DEBOUNCE_MS	20	/* ms */

static const unsigned int palmas_extcon_cable[] = {
	EXTCON_USB,
	EXTCON_USB_HOST,
	EXTCON_NONE,
};

static void palmas_usb_wakeup(struct palmas *palmas, int enable)
{
	if (enable)
		palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
			PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
	else
		palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
}

static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
{
	struct palmas_usb *palmas_usb = _palmas_usb;
	struct extcon_dev *edev = palmas_usb->edev;
	unsigned int vbus_line_state;

	palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
		PALMAS_INT3_LINE_STATE, &vbus_line_state);

	if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
		if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
			palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
			extcon_set_state_sync(edev, EXTCON_USB, true);
			dev_dbg(palmas_usb->dev, "USB cable is attached\n");
		} else {
			dev_dbg(palmas_usb->dev,
				"Spurious connect event detected\n");
		}
	} else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
		if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
			palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
			extcon_set_state_sync(edev, EXTCON_USB, false);
			dev_dbg(palmas_usb->dev, "USB cable is detached\n");
		} else {
			dev_dbg(palmas_usb->dev,
				"Spurious disconnect event detected\n");
		}
	}

	return IRQ_HANDLED;
}

static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
{
	unsigned int set, id_src;
	struct palmas_usb *palmas_usb = _palmas_usb;
	struct extcon_dev *edev = palmas_usb->edev;

	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
		PALMAS_USB_ID_INT_LATCH_SET, &set);
	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
		PALMAS_USB_ID_INT_SRC, &id_src);

	if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
				(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
			PALMAS_USB_ID_INT_LATCH_CLR,
			PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
		palmas_usb->linkstat = PALMAS_USB_STATE_ID;
		extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
		dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
	} else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
				(id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
			PALMAS_USB_ID_INT_LATCH_CLR,
			PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
		palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
		extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
		dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
				(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
		palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
		extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
		dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
				(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
		palmas_usb->linkstat = PALMAS_USB_STATE_ID;
		extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
		dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
	}

	return IRQ_HANDLED;
}

static void palmas_gpio_id_detect(struct work_struct *work)
{
	int id;
	struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
						     struct palmas_usb,
						     wq_detectid);
	struct extcon_dev *edev = palmas_usb->edev;

	if (!palmas_usb->id_gpiod)
		return;

	id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);

	if (id) {
		extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
		dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
	} else {
		extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
		dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
	}
}

static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
{
	struct palmas_usb *palmas_usb = _palmas_usb;

	queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
			   palmas_usb->sw_debounce_jiffies);

	return IRQ_HANDLED;
}

static void palmas_enable_irq(struct palmas_usb *palmas_usb)
{
	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
		PALMAS_USB_VBUS_CTRL_SET,
		PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);

	if (palmas_usb->enable_id_detection) {
		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
			     PALMAS_USB_ID_CTRL_SET,
			     PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);

		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
			     PALMAS_USB_ID_INT_EN_HI_SET,
			     PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
			     PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
	}

	if (palmas_usb->enable_vbus_detection)
		palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);

	/* cold plug for host mode needs this delay */
	if (palmas_usb->enable_id_detection) {
		msleep(30);
		palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
	}
}

static int palmas_usb_probe(struct platform_device *pdev)
{
	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
	struct palmas_usb_platform_data	*pdata = dev_get_platdata(&pdev->dev);
	struct device_node *node = pdev->dev.of_node;
	struct palmas_usb *palmas_usb;
	int status;

	if (!palmas) {
		dev_err(&pdev->dev, "failed to get valid parent\n");
		return -EINVAL;
	}

	palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
	if (!palmas_usb)
		return -ENOMEM;

	if (node && !pdata) {
		palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
		palmas_usb->enable_id_detection = of_property_read_bool(node,
						"ti,enable-id-detection");
		palmas_usb->enable_vbus_detection = of_property_read_bool(node,
						"ti,enable-vbus-detection");
	} else {
		palmas_usb->wakeup = true;
		palmas_usb->enable_id_detection = true;
		palmas_usb->enable_vbus_detection = true;

		if (pdata)
			palmas_usb->wakeup = pdata->wakeup;
	}

	palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
							GPIOD_IN);
	if (IS_ERR(palmas_usb->id_gpiod))
		return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->id_gpiod),
				     "failed to get id gpio\n");

	palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
							GPIOD_IN);
	if (IS_ERR(palmas_usb->vbus_gpiod))
		return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->vbus_gpiod),
				     "failed to get id gpio\n");

	if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
		palmas_usb->enable_id_detection = false;
		palmas_usb->enable_gpio_id_detection = true;
	}

	if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
		palmas_usb->enable_vbus_detection = false;
		palmas_usb->enable_gpio_vbus_detection = true;
	}

	if (palmas_usb->enable_gpio_id_detection) {
		u32 debounce;

		if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
			debounce = USB_GPIO_DEBOUNCE_MS;

		status = gpiod_set_debounce(palmas_usb->id_gpiod,
					    debounce * 1000);
		if (status < 0)
			palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
	}

	status = devm_delayed_work_autocancel(&pdev->dev,
					      &palmas_usb->wq_detectid,
					      palmas_gpio_id_detect);
	if (status)
		return status;

	palmas->usb = palmas_usb;
	palmas_usb->palmas = palmas;

	palmas_usb->dev	 = &pdev->dev;

	palmas_usb_wakeup(palmas, palmas_usb->wakeup);

	platform_set_drvdata(pdev, palmas_usb);

	palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
						    palmas_extcon_cable);
	if (IS_ERR(palmas_usb->edev)) {
		dev_err(&pdev->dev, "failed to allocate extcon device\n");
		return -ENOMEM;
	}

	status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
	if (status) {
		dev_err(&pdev->dev, "failed to register extcon device\n");
		return status;
	}

	if (palmas_usb->enable_id_detection) {
		palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
							     PALMAS_ID_OTG_IRQ);
		palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
							 PALMAS_ID_IRQ);
		status = devm_request_threaded_irq(palmas_usb->dev,
				palmas_usb->id_irq,
				NULL, palmas_id_irq_handler,
				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
				IRQF_ONESHOT,
				"palmas_usb_id", palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
					palmas_usb->id_irq, status);
			return status;
		}
	} else if (palmas_usb->enable_gpio_id_detection) {
		palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
		if (palmas_usb->gpio_id_irq < 0) {
			dev_err(&pdev->dev, "failed to get id irq\n");
			return palmas_usb->gpio_id_irq;
		}
		status = devm_request_threaded_irq(&pdev->dev,
						   palmas_usb->gpio_id_irq,
						   NULL,
						   palmas_gpio_id_irq_handler,
						   IRQF_TRIGGER_RISING |
						   IRQF_TRIGGER_FALLING |
						   IRQF_ONESHOT,
						   "palmas_usb_id",
						   palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev,
				"failed to request handler for id irq\n");
			return status;
		}
	}

	if (palmas_usb->enable_vbus_detection) {
		palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
						       PALMAS_VBUS_OTG_IRQ);
		palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
							   PALMAS_VBUS_IRQ);
		status = devm_request_threaded_irq(palmas_usb->dev,
				palmas_usb->vbus_irq, NULL,
				palmas_vbus_irq_handler,
				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
				IRQF_ONESHOT,
				"palmas_usb_vbus", palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
					palmas_usb->vbus_irq, status);
			return status;
		}
	} else if (palmas_usb->enable_gpio_vbus_detection) {
		/* remux GPIO_1 as VBUSDET */
		status = palmas_update_bits(palmas,
			PALMAS_PU_PD_OD_BASE,
			PALMAS_PRIMARY_SECONDARY_PAD1,
			PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
			(1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
		if (status < 0) {
			dev_err(&pdev->dev, "can't remux GPIO1\n");
			return status;
		}

		palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
						       PALMAS_VBUS_OTG_IRQ);
		palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
		if (palmas_usb->gpio_vbus_irq < 0) {
			dev_err(&pdev->dev, "failed to get vbus irq\n");
			return palmas_usb->gpio_vbus_irq;
		}
		status = devm_request_threaded_irq(&pdev->dev,
						palmas_usb->gpio_vbus_irq,
						NULL,
						palmas_vbus_irq_handler,
						IRQF_TRIGGER_FALLING |
						IRQF_TRIGGER_RISING |
						IRQF_ONESHOT,
						"palmas_usb_vbus",
						palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev,
				"failed to request handler for vbus irq\n");
			return status;
		}
	}

	palmas_enable_irq(palmas_usb);
	/* perform initial detection */
	if (palmas_usb->enable_gpio_vbus_detection)
		palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
	device_set_wakeup_capable(&pdev->dev, true);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int palmas_usb_suspend(struct device *dev)
{
	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);

	if (device_may_wakeup(dev)) {
		if (palmas_usb->enable_vbus_detection)
			enable_irq_wake(palmas_usb->vbus_irq);
		if (palmas_usb->enable_gpio_vbus_detection)
			enable_irq_wake(palmas_usb->gpio_vbus_irq);
		if (palmas_usb->enable_id_detection)
			enable_irq_wake(palmas_usb->id_irq);
		if (palmas_usb->enable_gpio_id_detection)
			enable_irq_wake(palmas_usb->gpio_id_irq);
	}
	return 0;
}

static int palmas_usb_resume(struct device *dev)
{
	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);

	if (device_may_wakeup(dev)) {
		if (palmas_usb->enable_vbus_detection)
			disable_irq_wake(palmas_usb->vbus_irq);
		if (palmas_usb->enable_gpio_vbus_detection)
			disable_irq_wake(palmas_usb->gpio_vbus_irq);
		if (palmas_usb->enable_id_detection)
			disable_irq_wake(palmas_usb->id_irq);
		if (palmas_usb->enable_gpio_id_detection)
			disable_irq_wake(palmas_usb->gpio_id_irq);
	}

	/* check if GPIO states changed while suspend/resume */
	if (palmas_usb->enable_gpio_vbus_detection)
		palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);

	return 0;
};
#endif

static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);

static const struct of_device_id of_palmas_match_tbl[] = {
	{ .compatible = "ti,palmas-usb", },
	{ .compatible = "ti,palmas-usb-vid", },
	{ .compatible = "ti,twl6035-usb", },
	{ .compatible = "ti,twl6035-usb-vid", },
	{ /* end */ }
};

static struct platform_driver palmas_usb_driver = {
	.probe = palmas_usb_probe,
	.driver = {
		.name = "palmas-usb",
		.of_match_table = of_palmas_match_tbl,
		.pm = &palmas_pm_ops,
	},
};

module_platform_driver(palmas_usb_driver);

MODULE_ALIAS("platform:palmas-usb");
MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
MODULE_DESCRIPTION("Palmas USB transceiver driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
b1f254e3 GG	2	/*
	3	* Palmas USB transceiver driver
	4	*
f6dfb3c9	5	* Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
b1f254e3 GG	6	* Author: Graeme Gregory <gg@slimlogic.co.uk>
b1f254e3 GG	7	* Author: Kishon Vijay Abraham I <kishon@ti.com>
b1f254e3	8	* Based on twl6030_usb.c
b1f254e3	9	* Author: Hema HK <hemahk@ti.com>
b1f254e3 GG	10	*/
b1f254e3 GG	11
f94a5bec	12	#include <linux/devm-helpers.h>
b1f254e3 GG	13	#include <linux/module.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/platform_device.h>
f63d32d4	16	#include <linux/slab.h>
b1f254e3 GG	17	#include <linux/err.h>
	18	#include <linux/mfd/palmas.h>
	19	#include <linux/of.h>
	20	#include <linux/of_platform.h>
ac22a1d3	21	#include <linux/gpio/consumer.h>
92b7cb5d RQ	22	#include <linux/workqueue.h>
	23
	24	#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
b1f254e3	25
73b6ecdb	26	static const unsigned int palmas_extcon_cable[] = {
2a9de9c0 CC	27	EXTCON_USB,
	28	EXTCON_USB_HOST,
	29	EXTCON_NONE,
b1f254e3 GG	30	};
b1f254e3 GG	31
b1f254e3 GG	32	static void palmas_usb_wakeup(struct palmas *palmas, int enable)
	33	{
	34	if (enable)
	35	palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
	36	PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
	37	else
	38	palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
	39	}
	40
	41	static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
	42	{
	43	struct palmas_usb *palmas_usb = _palmas_usb;
2a9de9c0	44	struct extcon_dev *edev = palmas_usb->edev;
b1f254e3 GG	45	unsigned int vbus_line_state;
	46
	47	palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
	48	PALMAS_INT3_LINE_STATE, &vbus_line_state);
	49
	50	if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
	51	if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
	52	palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
8670b459	53	extcon_set_state_sync(edev, EXTCON_USB, true);
567ab5a8	54	dev_dbg(palmas_usb->dev, "USB cable is attached\n");
b1f254e3 GG	55	} else {
	56	dev_dbg(palmas_usb->dev,
	57	"Spurious connect event detected\n");
	58	}
	59	} else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
	60	if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
	61	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
8670b459	62	extcon_set_state_sync(edev, EXTCON_USB, false);
567ab5a8	63	dev_dbg(palmas_usb->dev, "USB cable is detached\n");
b1f254e3 GG	64	} else {
	65	dev_dbg(palmas_usb->dev,
	66	"Spurious disconnect event detected\n");
	67	}
	68	}
	69
	70	return IRQ_HANDLED;
	71	}
	72
	73	static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
	74	{
b7d2d5be	75	unsigned int set, id_src;
b1f254e3	76	struct palmas_usb *palmas_usb = _palmas_usb;
2a9de9c0	77	struct extcon_dev *edev = palmas_usb->edev;
b1f254e3 GG	78
	79	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	80	PALMAS_USB_ID_INT_LATCH_SET, &set);
b7d2d5be GC	81	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
b7d2d5be GC	82	PALMAS_USB_ID_INT_SRC, &id_src);
b1f254e3	83
b7d2d5be GC	84	if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
b7d2d5be GC	85	(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
b1f254e3 GG	86	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	87	PALMAS_USB_ID_INT_LATCH_CLR,
	88	PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
	89	palmas_usb->linkstat = PALMAS_USB_STATE_ID;
8670b459	90	extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
567ab5a8	91	dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
b7d2d5be GC	92	} else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
b7d2d5be GC	93	(id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
b1f254e3 GG	94	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	95	PALMAS_USB_ID_INT_LATCH_CLR,
	96	PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
	97	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
8670b459	98	extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
567ab5a8	99	dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
002945f0 LD	100	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
	101	(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
	102	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
8670b459	103	extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
567ab5a8	104	dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
b7d2d5be GC	105	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
	106	(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
	107	palmas_usb->linkstat = PALMAS_USB_STATE_ID;
8670b459	108	extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
2fb67280	109	dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
b1f254e3 GG	110	}
	111
	112	return IRQ_HANDLED;
	113	}
	114
92b7cb5d RQ	115	static void palmas_gpio_id_detect(struct work_struct *work)
	116	{
	117	int id;
	118	struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
	119	struct palmas_usb,
	120	wq_detectid);
	121	struct extcon_dev *edev = palmas_usb->edev;
	122
	123	if (!palmas_usb->id_gpiod)
	124	return;
	125
	126	id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
	127
	128	if (id) {
8670b459	129	extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
567ab5a8	130	dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
92b7cb5d	131	} else {
8670b459	132	extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
567ab5a8	133	dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
92b7cb5d RQ	134	}
	135	}
	136
	137	static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
	138	{
	139	struct palmas_usb *palmas_usb = _palmas_usb;
	140
	141	queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
	142	palmas_usb->sw_debounce_jiffies);
	143
	144	return IRQ_HANDLED;
	145	}
	146
b1f254e3 GG	147	static void palmas_enable_irq(struct palmas_usb *palmas_usb)
	148	{
	149	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	150	PALMAS_USB_VBUS_CTRL_SET,
	151	PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
	152
92b7cb5d RQ	153	if (palmas_usb->enable_id_detection) {
	154	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	155	PALMAS_USB_ID_CTRL_SET,
	156	PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
b1f254e3	157
92b7cb5d RQ	158	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	159	PALMAS_USB_ID_INT_EN_HI_SET,
	160	PALMAS_USB_ID_INT_EN_HI_SET_ID_GND \|
	161	PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
	162	}
b1f254e3	163
7281e05a LD	164	if (palmas_usb->enable_vbus_detection)
7281e05a LD	165	palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
b1f254e3 GG	166
b1f254e3 GG	167	/* cold plug for host mode needs this delay */
7281e05a LD	168	if (palmas_usb->enable_id_detection) {
	169	msleep(30);
	170	palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
	171	}
b1f254e3 GG	172	}
	173
	174	static int palmas_usb_probe(struct platform_device *pdev)
	175	{
	176	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
7c0f6558	177	struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
b1f254e3 GG	178	struct device_node *node = pdev->dev.of_node;
	179	struct palmas_usb *palmas_usb;
	180	int status;
	181
9fe172b9 RQ	182	if (!palmas) {
	183	dev_err(&pdev->dev, "failed to get valid parent\n");
	184	return -EINVAL;
	185	}
	186
b1f254e3 GG	187	palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
	188	if (!palmas_usb)
	189	return -ENOMEM;
	190
7281e05a LD	191	if (node && !pdata) {
	192	palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
	193	palmas_usb->enable_id_detection = of_property_read_bool(node,
	194	"ti,enable-id-detection");
	195	palmas_usb->enable_vbus_detection = of_property_read_bool(node,
	196	"ti,enable-vbus-detection");
	197	} else {
	198	palmas_usb->wakeup = true;
	199	palmas_usb->enable_id_detection = true;
	200	palmas_usb->enable_vbus_detection = true;
	201
	202	if (pdata)
	203	palmas_usb->wakeup = pdata->wakeup;
	204	}
	205
ac22a1d3 CC	206	palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
ac22a1d3 CC	207	GPIOD_IN);
d0f66810 KK	208	if (IS_ERR(palmas_usb->id_gpiod))
	209	return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->id_gpiod),
	210	"failed to get id gpio\n");
92b7cb5d	211
b7aad8e2 FB	212	palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
b7aad8e2 FB	213	GPIOD_IN);
d0f66810 KK	214	if (IS_ERR(palmas_usb->vbus_gpiod))
	215	return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->vbus_gpiod),
	216	"failed to get id gpio\n");
b7aad8e2	217
92b7cb5d RQ	218	if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
	219	palmas_usb->enable_id_detection = false;
	220	palmas_usb->enable_gpio_id_detection = true;
	221	}
	222
b7aad8e2 FB	223	if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
	224	palmas_usb->enable_vbus_detection = false;
	225	palmas_usb->enable_gpio_vbus_detection = true;
	226	}
	227
92b7cb5d RQ	228	if (palmas_usb->enable_gpio_id_detection) {
	229	u32 debounce;
	230
	231	if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
	232	debounce = USB_GPIO_DEBOUNCE_MS;
	233
	234	status = gpiod_set_debounce(palmas_usb->id_gpiod,
	235	debounce * 1000);
	236	if (status < 0)
	237	palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
	238	}
	239
f94a5bec MV	240	status = devm_delayed_work_autocancel(&pdev->dev,
	241	&palmas_usb->wq_detectid,
	242	palmas_gpio_id_detect);
	243	if (status)
	244	return status;
92b7cb5d	245
b1f254e3 GG	246	palmas->usb = palmas_usb;
	247	palmas_usb->palmas = palmas;
	248
	249	palmas_usb->dev = &pdev->dev;
	250
7281e05a	251	palmas_usb_wakeup(palmas, palmas_usb->wakeup);
b1f254e3 GG	252
	253	platform_set_drvdata(pdev, palmas_usb);
	254
3f79a3fb CC	255	palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
	256	palmas_extcon_cable);
	257	if (IS_ERR(palmas_usb->edev)) {
	258	dev_err(&pdev->dev, "failed to allocate extcon device\n");
	259	return -ENOMEM;
	260	}
b1f254e3	261
3f79a3fb	262	status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
b1f254e3 GG	263	if (status) {
	264	dev_err(&pdev->dev, "failed to register extcon device\n");
	265	return status;
	266	}
	267
7281e05a	268	if (palmas_usb->enable_id_detection) {
92b7cb5d RQ	269	palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	270	PALMAS_ID_OTG_IRQ);
	271	palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
	272	PALMAS_ID_IRQ);
7281e05a LD	273	status = devm_request_threaded_irq(palmas_usb->dev,
	274	palmas_usb->id_irq,
	275	NULL, palmas_id_irq_handler,
	276	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
ae64e42c	277	IRQF_ONESHOT,
7281e05a LD	278	"palmas_usb_id", palmas_usb);
	279	if (status < 0) {
	280	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
b1f254e3	281	palmas_usb->id_irq, status);
b4dad55a	282	return status;
7281e05a	283	}
92b7cb5d RQ	284	} else if (palmas_usb->enable_gpio_id_detection) {
	285	palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
	286	if (palmas_usb->gpio_id_irq < 0) {
	287	dev_err(&pdev->dev, "failed to get id irq\n");
	288	return palmas_usb->gpio_id_irq;
	289	}
	290	status = devm_request_threaded_irq(&pdev->dev,
	291	palmas_usb->gpio_id_irq,
	292	NULL,
	293	palmas_gpio_id_irq_handler,
	294	IRQF_TRIGGER_RISING \|
	295	IRQF_TRIGGER_FALLING \|
	296	IRQF_ONESHOT,
	297	"palmas_usb_id",
	298	palmas_usb);
	299	if (status < 0) {
	300	dev_err(&pdev->dev,
	301	"failed to request handler for id irq\n");
	302	return status;
	303	}
b1f254e3 GG	304	}
b1f254e3 GG	305
7281e05a	306	if (palmas_usb->enable_vbus_detection) {
92b7cb5d RQ	307	palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	308	PALMAS_VBUS_OTG_IRQ);
	309	palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
	310	PALMAS_VBUS_IRQ);
7281e05a LD	311	status = devm_request_threaded_irq(palmas_usb->dev,
	312	palmas_usb->vbus_irq, NULL,
	313	palmas_vbus_irq_handler,
	314	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
ae64e42c	315	IRQF_ONESHOT,
7281e05a LD	316	"palmas_usb_vbus", palmas_usb);
	317	if (status < 0) {
	318	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
b1f254e3	319	palmas_usb->vbus_irq, status);
b4dad55a	320	return status;
7281e05a	321	}
b7aad8e2 FB	322	} else if (palmas_usb->enable_gpio_vbus_detection) {
	323	/* remux GPIO_1 as VBUSDET */
	324	status = palmas_update_bits(palmas,
	325	PALMAS_PU_PD_OD_BASE,
	326	PALMAS_PRIMARY_SECONDARY_PAD1,
	327	PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
	328	(1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
	329	if (status < 0) {
	330	dev_err(&pdev->dev, "can't remux GPIO1\n");
	331	return status;
	332	}
	333
	334	palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	335	PALMAS_VBUS_OTG_IRQ);
	336	palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
	337	if (palmas_usb->gpio_vbus_irq < 0) {
	338	dev_err(&pdev->dev, "failed to get vbus irq\n");
	339	return palmas_usb->gpio_vbus_irq;
	340	}
	341	status = devm_request_threaded_irq(&pdev->dev,
	342	palmas_usb->gpio_vbus_irq,
	343	NULL,
	344	palmas_vbus_irq_handler,
	345	IRQF_TRIGGER_FALLING \|
	346	IRQF_TRIGGER_RISING \|
f75587b8	347	IRQF_ONESHOT,
b7aad8e2 FB	348	"palmas_usb_vbus",
	349	palmas_usb);
	350	if (status < 0) {
	351	dev_err(&pdev->dev,
	352	"failed to request handler for vbus irq\n");
	353	return status;
	354	}
b1f254e3 GG	355	}
	356
	357	palmas_enable_irq(palmas_usb);
92b7cb5d	358	/* perform initial detection */
62e6d1e5 RQ	359	if (palmas_usb->enable_gpio_vbus_detection)
62e6d1e5 RQ	360	palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
92b7cb5d	361	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
024783ef	362	device_set_wakeup_capable(&pdev->dev, true);
b1f254e3	363	return 0;
b1f254e3 GG	364	}
b1f254e3 GG	365
024783ef LD	366	#ifdef CONFIG_PM_SLEEP
	367	static int palmas_usb_suspend(struct device *dev)
	368	{
	369	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
	370
	371	if (device_may_wakeup(dev)) {
7281e05a LD	372	if (palmas_usb->enable_vbus_detection)
7281e05a LD	373	enable_irq_wake(palmas_usb->vbus_irq);
b7aad8e2 FB	374	if (palmas_usb->enable_gpio_vbus_detection)
b7aad8e2 FB	375	enable_irq_wake(palmas_usb->gpio_vbus_irq);
7281e05a LD	376	if (palmas_usb->enable_id_detection)
7281e05a LD	377	enable_irq_wake(palmas_usb->id_irq);
92b7cb5d RQ	378	if (palmas_usb->enable_gpio_id_detection)
92b7cb5d RQ	379	enable_irq_wake(palmas_usb->gpio_id_irq);
024783ef LD	380	}
	381	return 0;
	382	}
	383
	384	static int palmas_usb_resume(struct device *dev)
	385	{
	386	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
	387
	388	if (device_may_wakeup(dev)) {
7281e05a LD	389	if (palmas_usb->enable_vbus_detection)
7281e05a LD	390	disable_irq_wake(palmas_usb->vbus_irq);
b7aad8e2 FB	391	if (palmas_usb->enable_gpio_vbus_detection)
b7aad8e2 FB	392	disable_irq_wake(palmas_usb->gpio_vbus_irq);
7281e05a LD	393	if (palmas_usb->enable_id_detection)
7281e05a LD	394	disable_irq_wake(palmas_usb->id_irq);
92b7cb5d RQ	395	if (palmas_usb->enable_gpio_id_detection)
92b7cb5d RQ	396	disable_irq_wake(palmas_usb->gpio_id_irq);
024783ef	397	}
01944321 RQ	398
	399	/* check if GPIO states changed while suspend/resume */
	400	if (palmas_usb->enable_gpio_vbus_detection)
	401	palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
	402	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
	403
024783ef LD	404	return 0;
	405	};
	406	#endif
	407
8d4288fb	408	static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
024783ef	409
3bc2ac7d	410	static const struct of_device_id of_palmas_match_tbl[] = {
b1f254e3	411	{ .compatible = "ti,palmas-usb", },
5fbc77d6	412	{ .compatible = "ti,palmas-usb-vid", },
b1f254e3	413	{ .compatible = "ti,twl6035-usb", },
5fbc77d6	414	{ .compatible = "ti,twl6035-usb-vid", },
b1f254e3 GG	415	{ /* end */ }
	416	};
	417
	418	static struct platform_driver palmas_usb_driver = {
	419	.probe = palmas_usb_probe,
b1f254e3 GG	420	.driver = {
	421	.name = "palmas-usb",
	422	.of_match_table = of_palmas_match_tbl,
024783ef	423	.pm = &palmas_pm_ops,
b1f254e3 GG	424	},
	425	};
	426
	427	module_platform_driver(palmas_usb_driver);
	428
	429	MODULE_ALIAS("platform:palmas-usb");
	430	MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
	431	MODULE_DESCRIPTION("Palmas USB transceiver driver");
	432	MODULE_LICENSE("GPL");
	433	MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);