[deliverable/linux.git] / drivers / extcon / extcon-palmas.c

/*
 * Palmas USB transceiver driver
 *
 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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>
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#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/of_gpio.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_info(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_info(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_info(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_info(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_info(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_info(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_info(palmas_usb->dev, "USB-HOST cable is detached\n");
	} else {
		extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
		dev_info(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;

	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)) {
		dev_err(&pdev->dev, "failed to get id gpio\n");
		return PTR_ERR(palmas_usb->id_gpiod);
	}

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

	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);
	}

	INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);

	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;
}

static int palmas_usb_remove(struct platform_device *pdev)
{
	struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);

	cancel_delayed_work_sync(&palmas_usb->wq_detectid);

	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);
	}
	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,
	.remove = palmas_usb_remove,
	.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
b1f254e3 GG	1	/*
	2	* Palmas USB transceiver driver
	3	*
	4	* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* Author: Graeme Gregory <gg@slimlogic.co.uk>
	11	* Author: Kishon Vijay Abraham I <kishon@ti.com>
	12	*
	13	* Based on twl6030_usb.c
	14	*
	15	* Author: Hema HK <hemahk@ti.com>
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/platform_device.h>
f63d32d4	26	#include <linux/slab.h>
b1f254e3 GG	27	#include <linux/err.h>
	28	#include <linux/mfd/palmas.h>
	29	#include <linux/of.h>
	30	#include <linux/of_platform.h>
92b7cb5d	31	#include <linux/of_gpio.h>
ac22a1d3	32	#include <linux/gpio/consumer.h>
92b7cb5d RQ	33	#include <linux/workqueue.h>
	34
	35	#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
b1f254e3	36
73b6ecdb	37	static const unsigned int palmas_extcon_cable[] = {
2a9de9c0 CC	38	EXTCON_USB,
	39	EXTCON_USB_HOST,
	40	EXTCON_NONE,
b1f254e3 GG	41	};
b1f254e3 GG	42
b1f254e3 GG	43	static void palmas_usb_wakeup(struct palmas *palmas, int enable)
	44	{
	45	if (enable)
	46	palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
	47	PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
	48	else
	49	palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
	50	}
	51
	52	static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
	53	{
	54	struct palmas_usb *palmas_usb = _palmas_usb;
2a9de9c0	55	struct extcon_dev *edev = palmas_usb->edev;
b1f254e3 GG	56	unsigned int vbus_line_state;
	57
	58	palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
	59	PALMAS_INT3_LINE_STATE, &vbus_line_state);
	60
	61	if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
	62	if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
	63	palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
8670b459	64	extcon_set_state_sync(edev, EXTCON_USB, true);
002945f0	65	dev_info(palmas_usb->dev, "USB cable is attached\n");
b1f254e3 GG	66	} else {
	67	dev_dbg(palmas_usb->dev,
	68	"Spurious connect event detected\n");
	69	}
	70	} else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
	71	if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
	72	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
8670b459	73	extcon_set_state_sync(edev, EXTCON_USB, false);
002945f0	74	dev_info(palmas_usb->dev, "USB cable is detached\n");
b1f254e3 GG	75	} else {
	76	dev_dbg(palmas_usb->dev,
	77	"Spurious disconnect event detected\n");
	78	}
	79	}
	80
	81	return IRQ_HANDLED;
	82	}
	83
	84	static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
	85	{
b7d2d5be	86	unsigned int set, id_src;
b1f254e3	87	struct palmas_usb *palmas_usb = _palmas_usb;
2a9de9c0	88	struct extcon_dev *edev = palmas_usb->edev;
b1f254e3 GG	89
	90	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	91	PALMAS_USB_ID_INT_LATCH_SET, &set);
b7d2d5be GC	92	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
b7d2d5be GC	93	PALMAS_USB_ID_INT_SRC, &id_src);
b1f254e3	94
b7d2d5be GC	95	if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
b7d2d5be GC	96	(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
b1f254e3 GG	97	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	98	PALMAS_USB_ID_INT_LATCH_CLR,
	99	PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
	100	palmas_usb->linkstat = PALMAS_USB_STATE_ID;
8670b459	101	extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
002945f0	102	dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
b7d2d5be GC	103	} else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
b7d2d5be GC	104	(id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
b1f254e3 GG	105	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	106	PALMAS_USB_ID_INT_LATCH_CLR,
	107	PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
	108	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
8670b459	109	extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
002945f0 LD	110	dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
	111	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
	112	(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
	113	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
8670b459	114	extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
002945f0	115	dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
b7d2d5be GC	116	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
	117	(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
	118	palmas_usb->linkstat = PALMAS_USB_STATE_ID;
8670b459	119	extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
b7d2d5be	120	dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
b1f254e3 GG	121	}
	122
	123	return IRQ_HANDLED;
	124	}
	125
92b7cb5d RQ	126	static void palmas_gpio_id_detect(struct work_struct *work)
	127	{
	128	int id;
	129	struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
	130	struct palmas_usb,
	131	wq_detectid);
	132	struct extcon_dev *edev = palmas_usb->edev;
	133
	134	if (!palmas_usb->id_gpiod)
	135	return;
	136
	137	id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
	138
	139	if (id) {
8670b459	140	extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
92b7cb5d RQ	141	dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
92b7cb5d RQ	142	} else {
8670b459	143	extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
92b7cb5d RQ	144	dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
	145	}
	146	}
	147
	148	static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
	149	{
	150	struct palmas_usb *palmas_usb = _palmas_usb;
	151
	152	queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
	153	palmas_usb->sw_debounce_jiffies);
	154
	155	return IRQ_HANDLED;
	156	}
	157
b1f254e3 GG	158	static void palmas_enable_irq(struct palmas_usb *palmas_usb)
	159	{
	160	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	161	PALMAS_USB_VBUS_CTRL_SET,
	162	PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
	163
92b7cb5d RQ	164	if (palmas_usb->enable_id_detection) {
	165	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	166	PALMAS_USB_ID_CTRL_SET,
	167	PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
b1f254e3	168
92b7cb5d RQ	169	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	170	PALMAS_USB_ID_INT_EN_HI_SET,
	171	PALMAS_USB_ID_INT_EN_HI_SET_ID_GND \|
	172	PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
	173	}
b1f254e3	174
7281e05a LD	175	if (palmas_usb->enable_vbus_detection)
7281e05a LD	176	palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
b1f254e3 GG	177
b1f254e3 GG	178	/* cold plug for host mode needs this delay */
7281e05a LD	179	if (palmas_usb->enable_id_detection) {
	180	msleep(30);
	181	palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
	182	}
b1f254e3 GG	183	}
	184
	185	static int palmas_usb_probe(struct platform_device *pdev)
	186	{
	187	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
7c0f6558	188	struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
b1f254e3 GG	189	struct device_node *node = pdev->dev.of_node;
	190	struct palmas_usb *palmas_usb;
	191	int status;
	192
b1f254e3 GG	193	palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
	194	if (!palmas_usb)
	195	return -ENOMEM;
	196
7281e05a LD	197	if (node && !pdata) {
	198	palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
	199	palmas_usb->enable_id_detection = of_property_read_bool(node,
	200	"ti,enable-id-detection");
	201	palmas_usb->enable_vbus_detection = of_property_read_bool(node,
	202	"ti,enable-vbus-detection");
	203	} else {
	204	palmas_usb->wakeup = true;
	205	palmas_usb->enable_id_detection = true;
	206	palmas_usb->enable_vbus_detection = true;
	207
	208	if (pdata)
	209	palmas_usb->wakeup = pdata->wakeup;
	210	}
	211
ac22a1d3 CC	212	palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
ac22a1d3 CC	213	GPIOD_IN);
92b7cb5d RQ	214	if (IS_ERR(palmas_usb->id_gpiod)) {
	215	dev_err(&pdev->dev, "failed to get id gpio\n");
	216	return PTR_ERR(palmas_usb->id_gpiod);
	217	}
	218
b7aad8e2 FB	219	palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
	220	GPIOD_IN);
	221	if (IS_ERR(palmas_usb->vbus_gpiod)) {
	222	dev_err(&pdev->dev, "failed to get vbus gpio\n");
	223	return PTR_ERR(palmas_usb->vbus_gpiod);
	224	}
	225
92b7cb5d RQ	226	if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
	227	palmas_usb->enable_id_detection = false;
	228	palmas_usb->enable_gpio_id_detection = true;
	229	}
	230
b7aad8e2 FB	231	if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
	232	palmas_usb->enable_vbus_detection = false;
	233	palmas_usb->enable_gpio_vbus_detection = true;
	234	}
	235
92b7cb5d RQ	236	if (palmas_usb->enable_gpio_id_detection) {
	237	u32 debounce;
	238
	239	if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
	240	debounce = USB_GPIO_DEBOUNCE_MS;
	241
	242	status = gpiod_set_debounce(palmas_usb->id_gpiod,
	243	debounce * 1000);
	244	if (status < 0)
	245	palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
	246	}
	247
	248	INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);
	249
b1f254e3 GG	250	palmas->usb = palmas_usb;
	251	palmas_usb->palmas = palmas;
	252
	253	palmas_usb->dev = &pdev->dev;
	254
7281e05a	255	palmas_usb_wakeup(palmas, palmas_usb->wakeup);
b1f254e3 GG	256
	257	platform_set_drvdata(pdev, palmas_usb);
	258
3f79a3fb CC	259	palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
	260	palmas_extcon_cable);
	261	if (IS_ERR(palmas_usb->edev)) {
	262	dev_err(&pdev->dev, "failed to allocate extcon device\n");
	263	return -ENOMEM;
	264	}
b1f254e3	265
3f79a3fb	266	status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
b1f254e3 GG	267	if (status) {
	268	dev_err(&pdev->dev, "failed to register extcon device\n");
	269	return status;
	270	}
	271
7281e05a	272	if (palmas_usb->enable_id_detection) {
92b7cb5d RQ	273	palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	274	PALMAS_ID_OTG_IRQ);
	275	palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
	276	PALMAS_ID_IRQ);
7281e05a LD	277	status = devm_request_threaded_irq(palmas_usb->dev,
	278	palmas_usb->id_irq,
	279	NULL, palmas_id_irq_handler,
	280	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
ae64e42c	281	IRQF_ONESHOT,
7281e05a LD	282	"palmas_usb_id", palmas_usb);
	283	if (status < 0) {
	284	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
b1f254e3	285	palmas_usb->id_irq, status);
b4dad55a	286	return status;
7281e05a	287	}
92b7cb5d RQ	288	} else if (palmas_usb->enable_gpio_id_detection) {
	289	palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
	290	if (palmas_usb->gpio_id_irq < 0) {
	291	dev_err(&pdev->dev, "failed to get id irq\n");
	292	return palmas_usb->gpio_id_irq;
	293	}
	294	status = devm_request_threaded_irq(&pdev->dev,
	295	palmas_usb->gpio_id_irq,
	296	NULL,
	297	palmas_gpio_id_irq_handler,
	298	IRQF_TRIGGER_RISING \|
	299	IRQF_TRIGGER_FALLING \|
	300	IRQF_ONESHOT,
	301	"palmas_usb_id",
	302	palmas_usb);
	303	if (status < 0) {
	304	dev_err(&pdev->dev,
	305	"failed to request handler for id irq\n");
	306	return status;
	307	}
b1f254e3 GG	308	}
b1f254e3 GG	309
7281e05a	310	if (palmas_usb->enable_vbus_detection) {
92b7cb5d RQ	311	palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	312	PALMAS_VBUS_OTG_IRQ);
	313	palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
	314	PALMAS_VBUS_IRQ);
7281e05a LD	315	status = devm_request_threaded_irq(palmas_usb->dev,
	316	palmas_usb->vbus_irq, NULL,
	317	palmas_vbus_irq_handler,
	318	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
ae64e42c	319	IRQF_ONESHOT,
7281e05a LD	320	"palmas_usb_vbus", palmas_usb);
	321	if (status < 0) {
	322	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
b1f254e3	323	palmas_usb->vbus_irq, status);
b4dad55a	324	return status;
7281e05a	325	}
b7aad8e2 FB	326	} else if (palmas_usb->enable_gpio_vbus_detection) {
	327	/* remux GPIO_1 as VBUSDET */
	328	status = palmas_update_bits(palmas,
	329	PALMAS_PU_PD_OD_BASE,
	330	PALMAS_PRIMARY_SECONDARY_PAD1,
	331	PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
	332	(1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
	333	if (status < 0) {
	334	dev_err(&pdev->dev, "can't remux GPIO1\n");
	335	return status;
	336	}
	337
	338	palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	339	PALMAS_VBUS_OTG_IRQ);
	340	palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
	341	if (palmas_usb->gpio_vbus_irq < 0) {
	342	dev_err(&pdev->dev, "failed to get vbus irq\n");
	343	return palmas_usb->gpio_vbus_irq;
	344	}
	345	status = devm_request_threaded_irq(&pdev->dev,
	346	palmas_usb->gpio_vbus_irq,
	347	NULL,
	348	palmas_vbus_irq_handler,
	349	IRQF_TRIGGER_FALLING \|
	350	IRQF_TRIGGER_RISING \|
f75587b8	351	IRQF_ONESHOT,
b7aad8e2 FB	352	"palmas_usb_vbus",
	353	palmas_usb);
	354	if (status < 0) {
	355	dev_err(&pdev->dev,
	356	"failed to request handler for vbus irq\n");
	357	return status;
	358	}
b1f254e3 GG	359	}
	360
	361	palmas_enable_irq(palmas_usb);
92b7cb5d	362	/* perform initial detection */
62e6d1e5 RQ	363	if (palmas_usb->enable_gpio_vbus_detection)
62e6d1e5 RQ	364	palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
92b7cb5d	365	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
024783ef	366	device_set_wakeup_capable(&pdev->dev, true);
b1f254e3	367	return 0;
b1f254e3 GG	368	}
b1f254e3 GG	369
92b7cb5d RQ	370	static int palmas_usb_remove(struct platform_device *pdev)
	371	{
	372	struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
	373
	374	cancel_delayed_work_sync(&palmas_usb->wq_detectid);
	375
	376	return 0;
	377	}
	378
024783ef LD	379	#ifdef CONFIG_PM_SLEEP
	380	static int palmas_usb_suspend(struct device *dev)
	381	{
	382	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
	383
	384	if (device_may_wakeup(dev)) {
7281e05a LD	385	if (palmas_usb->enable_vbus_detection)
7281e05a LD	386	enable_irq_wake(palmas_usb->vbus_irq);
b7aad8e2 FB	387	if (palmas_usb->enable_gpio_vbus_detection)
b7aad8e2 FB	388	enable_irq_wake(palmas_usb->gpio_vbus_irq);
7281e05a LD	389	if (palmas_usb->enable_id_detection)
7281e05a LD	390	enable_irq_wake(palmas_usb->id_irq);
92b7cb5d RQ	391	if (palmas_usb->enable_gpio_id_detection)
92b7cb5d RQ	392	enable_irq_wake(palmas_usb->gpio_id_irq);
024783ef LD	393	}
	394	return 0;
	395	}
	396
	397	static int palmas_usb_resume(struct device *dev)
	398	{
	399	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
	400
	401	if (device_may_wakeup(dev)) {
7281e05a LD	402	if (palmas_usb->enable_vbus_detection)
7281e05a LD	403	disable_irq_wake(palmas_usb->vbus_irq);
b7aad8e2 FB	404	if (palmas_usb->enable_gpio_vbus_detection)
b7aad8e2 FB	405	disable_irq_wake(palmas_usb->gpio_vbus_irq);
7281e05a LD	406	if (palmas_usb->enable_id_detection)
7281e05a LD	407	disable_irq_wake(palmas_usb->id_irq);
92b7cb5d RQ	408	if (palmas_usb->enable_gpio_id_detection)
92b7cb5d RQ	409	disable_irq_wake(palmas_usb->gpio_id_irq);
024783ef LD	410	}
	411	return 0;
	412	};
	413	#endif
	414
8d4288fb	415	static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
024783ef	416
3bc2ac7d	417	static const struct of_device_id of_palmas_match_tbl[] = {
b1f254e3	418	{ .compatible = "ti,palmas-usb", },
5fbc77d6	419	{ .compatible = "ti,palmas-usb-vid", },
b1f254e3	420	{ .compatible = "ti,twl6035-usb", },
5fbc77d6	421	{ .compatible = "ti,twl6035-usb-vid", },
b1f254e3 GG	422	{ /* end */ }
	423	};
	424
	425	static struct platform_driver palmas_usb_driver = {
	426	.probe = palmas_usb_probe,
92b7cb5d	427	.remove = palmas_usb_remove,
b1f254e3 GG	428	.driver = {
	429	.name = "palmas-usb",
	430	.of_match_table = of_palmas_match_tbl,
024783ef	431	.pm = &palmas_pm_ops,
b1f254e3 GG	432	},
	433	};
	434
	435	module_platform_driver(palmas_usb_driver);
	436
	437	MODULE_ALIAS("platform:palmas-usb");
	438	MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
	439	MODULE_DESCRIPTION("Palmas USB transceiver driver");
	440	MODULE_LICENSE("GPL");
	441	MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);