drivers/extcon/extcon-palmas.c - kernel/common - Git at Google

 /*
  * 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 <[email protected]>
  * Author: Kishon Vijay Abraham I <[email protected]>
  *
  * Based on twl6030_usb.c
  *
  * Author: Hema HK <[email protected]>
  *
  * 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);
 		} 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);
 		} 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_EN_HI_SET,
 			PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
 		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 			PALMAS_USB_ID_INT_EN_HI_CLR,
 			PALMAS_USB_ID_INT_EN_HI_CLR_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);
 	} else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
 		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_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 			PALMAS_USB_ID_INT_EN_HI_CLR,
 			PALMAS_USB_ID_INT_EN_HI_CLR_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);
 	}

 	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_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.name = "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,
 			"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,
 			"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);

 	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;
 }

 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,
 	},
 };

 module_platform_driver(palmas_usb_driver);

 MODULE_ALIAS("platform:palmas-usb");
 MODULE_AUTHOR("Graeme Gregory <[email protected]>");
 MODULE_DESCRIPTION("Palmas USB transceiver driver");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
	/*
	* 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 <[email protected]>
	* Author: Kishon Vijay Abraham I <[email protected]>
	*
	* Based on twl6030_usb.c
	*
	* Author: Hema HK <[email protected]>
	*
	* 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);
	} 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);
	} 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_EN_HI_SET,
	PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	PALMAS_USB_ID_INT_EN_HI_CLR,
	PALMAS_USB_ID_INT_EN_HI_CLR_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);
	} else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
	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_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
	PALMAS_USB_ID_INT_EN_HI_CLR,
	PALMAS_USB_ID_INT_EN_HI_CLR_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);
	}

	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_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.name = "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,
	"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,
	"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);

	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;
	}

	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,
	},
	};

	module_platform_driver(palmas_usb_driver);

	MODULE_ALIAS("platform:palmas-usb");
	MODULE_AUTHOR("Graeme Gregory <[email protected]>");
	MODULE_DESCRIPTION("Palmas USB transceiver driver");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);