[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/err.h>
#include <linux/mfd/palmas.h>
#include <linux/of.h>
#include <linux/of_platform.h>

static const char *palmas_extcon_cable[] = {
	[0] = "USB",
	[1] = "USB-HOST",
	NULL,
};

static const int mutually_exclusive[] = {0x3, 0x0};

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;
	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_cable_state(&palmas_usb->edev, "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_cable_state(&palmas_usb->edev, "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;
	struct palmas_usb *palmas_usb = _palmas_usb;

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

	if (set & 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_cable_state(&palmas_usb->edev, "USB-HOST", true);
		dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
	} else if (set & 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_cable_state(&palmas_usb->edev, "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_cable_state(&palmas_usb->edev, "USB-HOST", false);
		dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
	}

	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);

	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);

	palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);

	/* cold plug for host mode needs this delay */
	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 = pdev->dev.platform_data;
	struct device_node *node = pdev->dev.of_node;
	struct palmas_usb *palmas_usb;
	int status;

	if (node && !pdata) {
		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);

		if (!pdata)
			return -ENOMEM;

		pdata->wakeup = of_property_read_bool(node, "ti,wakeup");
	} else if (!pdata) {
		return -EINVAL;
	}

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

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

	palmas_usb->dev	 = &pdev->dev;

	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);
	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);

	palmas_usb_wakeup(palmas, pdata->wakeup);

	platform_set_drvdata(pdev, palmas_usb);

	palmas_usb->edev.supported_cable = palmas_extcon_cable;
	palmas_usb->edev.mutually_exclusive = mutually_exclusive;

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

	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 | IRQF_EARLY_RESUME,
			"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);
		goto fail_extcon;
	}

	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 | IRQF_EARLY_RESUME,
			"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);
		goto fail_extcon;
	}

	palmas_enable_irq(palmas_usb);
	device_set_wakeup_capable(&pdev->dev, true);
	return 0;

fail_extcon:
	extcon_dev_unregister(&palmas_usb->edev);

	return status;
}

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

	extcon_dev_unregister(&palmas_usb->edev);

	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)) {
		enable_irq_wake(palmas_usb->vbus_irq);
		enable_irq_wake(palmas_usb->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)) {
		disable_irq_wake(palmas_usb->vbus_irq);
		disable_irq_wake(palmas_usb->id_irq);
	}
	return 0;
};
#endif

static const struct dev_pm_ops palmas_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(palmas_usb_suspend,
				palmas_usb_resume)
};

static struct of_device_id of_palmas_match_tbl[] = {
	{ .compatible = "ti,palmas-usb", },
	{ .compatible = "ti,twl6035-usb", },
	{ /* 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,
		.owner = THIS_MODULE,
		.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>
	26	#include <linux/err.h>
	27	#include <linux/mfd/palmas.h>
	28	#include <linux/of.h>
	29	#include <linux/of_platform.h>
	30
	31	static const char *palmas_extcon_cable[] = {
	32	[0] = "USB",
	33	[1] = "USB-HOST",
	34	NULL,
	35	};
	36
	37	static const int mutually_exclusive[] = {0x3, 0x0};
	38
	39	static void palmas_usb_wakeup(struct palmas *palmas, int enable)
	40	{
	41	if (enable)
	42	palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
	43	PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
	44	else
	45	palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
	46	}
	47
	48	static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
	49	{
	50	struct palmas_usb *palmas_usb = _palmas_usb;
	51	unsigned int vbus_line_state;
	52
	53	palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
	54	PALMAS_INT3_LINE_STATE, &vbus_line_state);
	55
	56	if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
	57	if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
	58	palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
	59	extcon_set_cable_state(&palmas_usb->edev, "USB", true);
002945f0	60	dev_info(palmas_usb->dev, "USB cable is attached\n");
b1f254e3 GG	61	} else {
	62	dev_dbg(palmas_usb->dev,
	63	"Spurious connect event detected\n");
	64	}
	65	} else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
	66	if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
	67	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
	68	extcon_set_cable_state(&palmas_usb->edev, "USB", false);
002945f0	69	dev_info(palmas_usb->dev, "USB cable is detached\n");
b1f254e3 GG	70	} else {
	71	dev_dbg(palmas_usb->dev,
	72	"Spurious disconnect event detected\n");
	73	}
	74	}
	75
	76	return IRQ_HANDLED;
	77	}
	78
	79	static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
	80	{
	81	unsigned int set;
	82	struct palmas_usb *palmas_usb = _palmas_usb;
	83
	84	palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	85	PALMAS_USB_ID_INT_LATCH_SET, &set);
	86
	87	if (set & PALMAS_USB_ID_INT_SRC_ID_GND) {
b1f254e3 GG	88	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	89	PALMAS_USB_ID_INT_LATCH_CLR,
	90	PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
	91	palmas_usb->linkstat = PALMAS_USB_STATE_ID;
	92	extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
002945f0	93	dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
b1f254e3	94	} else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
b1f254e3 GG	95	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	96	PALMAS_USB_ID_INT_LATCH_CLR,
	97	PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
	98	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
	99	extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
002945f0 LD	100	dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
	101	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
	102	(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
	103	palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
	104	extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
	105	dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
b1f254e3 GG	106	}
	107
	108	return IRQ_HANDLED;
	109	}
	110
	111	static void palmas_enable_irq(struct palmas_usb *palmas_usb)
	112	{
	113	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	114	PALMAS_USB_VBUS_CTRL_SET,
	115	PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
	116
	117	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	118	PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
	119
	120	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	121	PALMAS_USB_ID_INT_EN_HI_SET,
002945f0 LD	122	PALMAS_USB_ID_INT_EN_HI_SET_ID_GND \|
002945f0 LD	123	PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
b1f254e3 GG	124
	125	palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
	126
	127	/* cold plug for host mode needs this delay */
	128	msleep(30);
	129	palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
	130	}
	131
	132	static int palmas_usb_probe(struct platform_device *pdev)
	133	{
	134	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
	135	struct palmas_usb_platform_data *pdata = pdev->dev.platform_data;
	136	struct device_node *node = pdev->dev.of_node;
	137	struct palmas_usb *palmas_usb;
	138	int status;
	139
	140	if (node && !pdata) {
	141	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	142
	143	if (!pdata)
	144	return -ENOMEM;
	145
	146	pdata->wakeup = of_property_read_bool(node, "ti,wakeup");
	147	} else if (!pdata) {
	148	return -EINVAL;
	149	}
	150
	151	palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
	152	if (!palmas_usb)
	153	return -ENOMEM;
	154
	155	palmas->usb = palmas_usb;
	156	palmas_usb->palmas = palmas;
	157
	158	palmas_usb->dev = &pdev->dev;
	159
	160	palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	161	PALMAS_ID_OTG_IRQ);
	162	palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
	163	PALMAS_ID_IRQ);
	164	palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
	165	PALMAS_VBUS_OTG_IRQ);
	166	palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
	167	PALMAS_VBUS_IRQ);
	168
	169	palmas_usb_wakeup(palmas, pdata->wakeup);
	170
	171	platform_set_drvdata(pdev, palmas_usb);
	172
b1f254e3 GG	173	palmas_usb->edev.supported_cable = palmas_extcon_cable;
	174	palmas_usb->edev.mutually_exclusive = mutually_exclusive;
	175
	176	status = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev);
	177	if (status) {
	178	dev_err(&pdev->dev, "failed to register extcon device\n");
	179	return status;
	180	}
	181
	182	status = devm_request_threaded_irq(palmas_usb->dev, palmas_usb->id_irq,
	183	NULL, palmas_id_irq_handler,
024783ef LD	184	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
024783ef LD	185	IRQF_ONESHOT \| IRQF_EARLY_RESUME,
b1f254e3 GG	186	"palmas_usb_id", palmas_usb);
	187	if (status < 0) {
	188	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
	189	palmas_usb->id_irq, status);
	190	goto fail_extcon;
	191	}
	192
	193	status = devm_request_threaded_irq(palmas_usb->dev,
	194	palmas_usb->vbus_irq, NULL, palmas_vbus_irq_handler,
024783ef LD	195	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
024783ef LD	196	IRQF_ONESHOT \| IRQF_EARLY_RESUME,
b1f254e3 GG	197	"palmas_usb_vbus", palmas_usb);
	198	if (status < 0) {
	199	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
	200	palmas_usb->vbus_irq, status);
	201	goto fail_extcon;
	202	}
	203
	204	palmas_enable_irq(palmas_usb);
024783ef	205	device_set_wakeup_capable(&pdev->dev, true);
b1f254e3 GG	206	return 0;
	207
	208	fail_extcon:
	209	extcon_dev_unregister(&palmas_usb->edev);
	210
	211	return status;
	212	}
	213
	214	static int palmas_usb_remove(struct platform_device *pdev)
	215	{
	216	struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
	217
	218	extcon_dev_unregister(&palmas_usb->edev);
	219
	220	return 0;
	221	}
	222
024783ef LD	223	#ifdef CONFIG_PM_SLEEP
	224	static int palmas_usb_suspend(struct device *dev)
	225	{
	226	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
	227
	228	if (device_may_wakeup(dev)) {
	229	enable_irq_wake(palmas_usb->vbus_irq);
	230	enable_irq_wake(palmas_usb->id_irq);
	231	}
	232	return 0;
	233	}
	234
	235	static int palmas_usb_resume(struct device *dev)
	236	{
	237	struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
	238
	239	if (device_may_wakeup(dev)) {
	240	disable_irq_wake(palmas_usb->vbus_irq);
	241	disable_irq_wake(palmas_usb->id_irq);
	242	}
	243	return 0;
	244	};
	245	#endif
	246
	247	static const struct dev_pm_ops palmas_pm_ops = {
	248	SET_SYSTEM_SLEEP_PM_OPS(palmas_usb_suspend,
	249	palmas_usb_resume)
	250	};
	251
b1f254e3 GG	252	static struct of_device_id of_palmas_match_tbl[] = {
	253	{ .compatible = "ti,palmas-usb", },
	254	{ .compatible = "ti,twl6035-usb", },
	255	{ /* end */ }
	256	};
	257
	258	static struct platform_driver palmas_usb_driver = {
	259	.probe = palmas_usb_probe,
	260	.remove = palmas_usb_remove,
	261	.driver = {
	262	.name = "palmas-usb",
	263	.of_match_table = of_palmas_match_tbl,
	264	.owner = THIS_MODULE,
024783ef	265	.pm = &palmas_pm_ops,
b1f254e3 GG	266	},
	267	};
	268
	269	module_platform_driver(palmas_usb_driver);
	270
	271	MODULE_ALIAS("platform:palmas-usb");
	272	MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
	273	MODULE_DESCRIPTION("Palmas USB transceiver driver");
	274	MODULE_LICENSE("GPL");
	275	MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);