drivers/usb/phy/phy-generic.c - maze/linux - Git at Google

 /*
  * drivers/usb/otg/nop-usb-xceiv.c
  *
  * NOP USB transceiver for all USB transceiver which are either built-in
  * into USB IP or which are mostly autonomous.
  *
  * Copyright (C) 2009 Texas Instruments Inc
  * Author: Ajay Kumar Gupta <ajay.gupta@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.
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  * Current status:
  *	This provides a "nop" transceiver for PHYs which are
  *	autonomous such as isp1504, isp1707, etc.
  */

 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/usb/otg.h>
 #include <linux/usb/usb_phy_gen_xceiv.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/regulator/consumer.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/gpio.h>
 #include <linux/delay.h>

 #include "phy-generic.h"

 static struct platform_device *pd;

 void usb_nop_xceiv_register(void)
 {
 	if (pd)
 		return;
 	pd = platform_device_register_simple("usb_phy_gen_xceiv", -1, NULL, 0);
 	if (IS_ERR(pd)) {
 		pr_err("Unable to register generic usb transceiver\n");
 		pd = NULL;
 		return;
 	}
 }
 EXPORT_SYMBOL(usb_nop_xceiv_register);

 void usb_nop_xceiv_unregister(void)
 {
 	platform_device_unregister(pd);
 	pd = NULL;
 }
 EXPORT_SYMBOL(usb_nop_xceiv_unregister);

 static int nop_set_suspend(struct usb_phy *x, int suspend)
 {
 	return 0;
 }

 static void nop_reset_set(struct usb_phy_gen_xceiv *nop, int asserted)
 {
 	int value;

 	if (!gpio_is_valid(nop->gpio_reset))
 		return;

 	value = asserted;
 	if (nop->reset_active_low)
 		value = !value;

 	gpio_set_value_cansleep(nop->gpio_reset, value);

 	if (!asserted)
 		usleep_range(10000, 20000);
 }

 int usb_gen_phy_init(struct usb_phy *phy)
 {
 	struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);

 	if (!IS_ERR(nop->vcc)) {
 		if (regulator_enable(nop->vcc))
 			dev_err(phy->dev, "Failed to enable power\n");
 	}

 	if (!IS_ERR(nop->clk))
 		clk_prepare_enable(nop->clk);

 	/* De-assert RESET */
 	nop_reset_set(nop, 0);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(usb_gen_phy_init);

 void usb_gen_phy_shutdown(struct usb_phy *phy)
 {
 	struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);

 	/* Assert RESET */
 	nop_reset_set(nop, 1);

 	if (!IS_ERR(nop->clk))
 		clk_disable_unprepare(nop->clk);

 	if (!IS_ERR(nop->vcc)) {
 		if (regulator_disable(nop->vcc))
 			dev_err(phy->dev, "Failed to disable power\n");
 	}
 }
 EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown);

 static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
 {
 	if (!otg)
 		return -ENODEV;

 	if (!gadget) {
 		otg->gadget = NULL;
 		return -ENODEV;
 	}

 	otg->gadget = gadget;
 	otg->phy->state = OTG_STATE_B_IDLE;
 	return 0;
 }

 static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
 {
 	if (!otg)
 		return -ENODEV;

 	if (!host) {
 		otg->host = NULL;
 		return -ENODEV;
 	}

 	otg->host = host;
 	return 0;
 }

 int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_gen_xceiv *nop,
 		struct usb_phy_gen_xceiv_platform_data *pdata)
 {
 	enum usb_phy_type type = USB_PHY_TYPE_USB2;
 	int err;

 	u32 clk_rate = 0;
 	bool needs_vcc = false;

 	nop->reset_active_low = true;	/* default behaviour */

 	if (dev->of_node) {
 		struct device_node *node = dev->of_node;
 		enum of_gpio_flags flags = 0;

 		if (of_property_read_u32(node, "clock-frequency", &clk_rate))
 			clk_rate = 0;

 		needs_vcc = of_property_read_bool(node, "vcc-supply");
 		nop->gpio_reset = of_get_named_gpio_flags(node, "reset-gpios",
 								0, &flags);
 		if (nop->gpio_reset == -EPROBE_DEFER)
 			return -EPROBE_DEFER;

 		nop->reset_active_low = flags & OF_GPIO_ACTIVE_LOW;

 	} else if (pdata) {
 		type = pdata->type;
 		clk_rate = pdata->clk_rate;
 		needs_vcc = pdata->needs_vcc;
 		nop->gpio_reset = pdata->gpio_reset;
 	} else {
 		nop->gpio_reset = -1;
 	}

 	nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
 			GFP_KERNEL);
 	if (!nop->phy.otg)
 		return -ENOMEM;

 	nop->clk = devm_clk_get(dev, "main_clk");
 	if (IS_ERR(nop->clk)) {
 		dev_dbg(dev, "Can't get phy clock: %ld\n",
 					PTR_ERR(nop->clk));
 	}

 	if (!IS_ERR(nop->clk) && clk_rate) {
 		err = clk_set_rate(nop->clk, clk_rate);
 		if (err) {
 			dev_err(dev, "Error setting clock rate\n");
 			return err;
 		}
 	}

 	nop->vcc = devm_regulator_get(dev, "vcc");
 	if (IS_ERR(nop->vcc)) {
 		dev_dbg(dev, "Error getting vcc regulator: %ld\n",
 					PTR_ERR(nop->vcc));
 		if (needs_vcc)
 			return -EPROBE_DEFER;
 	}

 	if (gpio_is_valid(nop->gpio_reset)) {
 		unsigned long gpio_flags;

 		/* Assert RESET */
 		if (nop->reset_active_low)
 			gpio_flags = GPIOF_OUT_INIT_LOW;
 		else
 			gpio_flags = GPIOF_OUT_INIT_HIGH;

 		err = devm_gpio_request_one(dev, nop->gpio_reset,
 						gpio_flags, dev_name(dev));
 		if (err) {
 			dev_err(dev, "Error requesting RESET GPIO %d\n",
 					nop->gpio_reset);
 			return err;
 		}
 	}

 	nop->dev		= dev;
 	nop->phy.dev		= nop->dev;
 	nop->phy.label		= "nop-xceiv";
 	nop->phy.set_suspend	= nop_set_suspend;
 	nop->phy.state		= OTG_STATE_UNDEFINED;
 	nop->phy.type		= type;

 	nop->phy.otg->phy		= &nop->phy;
 	nop->phy.otg->set_host		= nop_set_host;
 	nop->phy.otg->set_peripheral	= nop_set_peripheral;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy);

 static int usb_phy_gen_xceiv_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct usb_phy_gen_xceiv	*nop;
 	int err;

 	nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
 	if (!nop)
 		return -ENOMEM;

 	err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev));
 	if (err)
 		return err;

 	nop->phy.init		= usb_gen_phy_init;
 	nop->phy.shutdown	= usb_gen_phy_shutdown;

 	err = usb_add_phy_dev(&nop->phy);
 	if (err) {
 		dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
 			err);
 		return err;
 	}

 	platform_set_drvdata(pdev, nop);

 	return 0;
 }

 static int usb_phy_gen_xceiv_remove(struct platform_device *pdev)
 {
 	struct usb_phy_gen_xceiv *nop = platform_get_drvdata(pdev);

 	usb_remove_phy(&nop->phy);

 	return 0;
 }

 static const struct of_device_id nop_xceiv_dt_ids[] = {
 	{ .compatible = "usb-nop-xceiv" },
 	{ }
 };

 MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);

 static struct platform_driver usb_phy_gen_xceiv_driver = {
 	.probe		= usb_phy_gen_xceiv_probe,
 	.remove		= usb_phy_gen_xceiv_remove,
 	.driver		= {
 		.name	= "usb_phy_gen_xceiv",
 		.owner	= THIS_MODULE,
 		.of_match_table = nop_xceiv_dt_ids,
 	},
 };

 static int __init usb_phy_gen_xceiv_init(void)
 {
 	return platform_driver_register(&usb_phy_gen_xceiv_driver);
 }
 subsys_initcall(usb_phy_gen_xceiv_init);

 static void __exit usb_phy_gen_xceiv_exit(void)
 {
 	platform_driver_unregister(&usb_phy_gen_xceiv_driver);
 }
 module_exit(usb_phy_gen_xceiv_exit);

 MODULE_ALIAS("platform:usb_phy_gen_xceiv");
 MODULE_AUTHOR("Texas Instruments Inc");
 MODULE_DESCRIPTION("NOP USB Transceiver driver");
 MODULE_LICENSE("GPL");
	/*
	* drivers/usb/otg/nop-usb-xceiv.c
	*
	* NOP USB transceiver for all USB transceiver which are either built-in
	* into USB IP or which are mostly autonomous.
	*
	* Copyright (C) 2009 Texas Instruments Inc
	* Author: Ajay Kumar Gupta <ajay.gupta@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.
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*
	* Current status:
	* This provides a "nop" transceiver for PHYs which are
	* autonomous such as isp1504, isp1707, etc.
	*/

	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/dma-mapping.h>
	#include <linux/usb/otg.h>
	#include <linux/usb/usb_phy_gen_xceiv.h>
	#include <linux/slab.h>
	#include <linux/clk.h>
	#include <linux/regulator/consumer.h>
	#include <linux/of.h>
	#include <linux/of_gpio.h>
	#include <linux/gpio.h>
	#include <linux/delay.h>

	#include "phy-generic.h"

	static struct platform_device *pd;

	void usb_nop_xceiv_register(void)
	{
	if (pd)
	return;
	pd = platform_device_register_simple("usb_phy_gen_xceiv", -1, NULL, 0);
	if (IS_ERR(pd)) {
	pr_err("Unable to register generic usb transceiver\n");
	pd = NULL;
	return;
	}
	}
	EXPORT_SYMBOL(usb_nop_xceiv_register);

	void usb_nop_xceiv_unregister(void)
	{
	platform_device_unregister(pd);
	pd = NULL;
	}
	EXPORT_SYMBOL(usb_nop_xceiv_unregister);

	static int nop_set_suspend(struct usb_phy *x, int suspend)
	{
	return 0;
	}

	static void nop_reset_set(struct usb_phy_gen_xceiv *nop, int asserted)
	{
	int value;

	if (!gpio_is_valid(nop->gpio_reset))
	return;

	value = asserted;
	if (nop->reset_active_low)
	value = !value;

	gpio_set_value_cansleep(nop->gpio_reset, value);

	if (!asserted)
	usleep_range(10000, 20000);
	}

	int usb_gen_phy_init(struct usb_phy *phy)
	{
	struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);

	if (!IS_ERR(nop->vcc)) {
	if (regulator_enable(nop->vcc))
	dev_err(phy->dev, "Failed to enable power\n");
	}

	if (!IS_ERR(nop->clk))
	clk_prepare_enable(nop->clk);

	/* De-assert RESET */
	nop_reset_set(nop, 0);

	return 0;
	}
	EXPORT_SYMBOL_GPL(usb_gen_phy_init);

	void usb_gen_phy_shutdown(struct usb_phy *phy)
	{
	struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);

	/* Assert RESET */
	nop_reset_set(nop, 1);

	if (!IS_ERR(nop->clk))
	clk_disable_unprepare(nop->clk);

	if (!IS_ERR(nop->vcc)) {
	if (regulator_disable(nop->vcc))
	dev_err(phy->dev, "Failed to disable power\n");
	}
	}
	EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown);

	static int nop_set_peripheral(struct usb_otg otg, struct usb_gadget gadget)
	{
	if (!otg)
	return -ENODEV;

	if (!gadget) {
	otg->gadget = NULL;
	return -ENODEV;
	}

	otg->gadget = gadget;
	otg->phy->state = OTG_STATE_B_IDLE;
	return 0;
	}

	static int nop_set_host(struct usb_otg otg, struct usb_bus host)
	{
	if (!otg)
	return -ENODEV;

	if (!host) {
	otg->host = NULL;
	return -ENODEV;
	}

	otg->host = host;
	return 0;
	}

	int usb_phy_gen_create_phy(struct device dev, struct usb_phy_gen_xceiv nop,
	struct usb_phy_gen_xceiv_platform_data *pdata)
	{
	enum usb_phy_type type = USB_PHY_TYPE_USB2;
	int err;

	u32 clk_rate = 0;
	bool needs_vcc = false;

	nop->reset_active_low = true; /* default behaviour */

	if (dev->of_node) {
	struct device_node *node = dev->of_node;
	enum of_gpio_flags flags = 0;

	if (of_property_read_u32(node, "clock-frequency", &clk_rate))
	clk_rate = 0;

	needs_vcc = of_property_read_bool(node, "vcc-supply");
	nop->gpio_reset = of_get_named_gpio_flags(node, "reset-gpios",
	0, &flags);
	if (nop->gpio_reset == -EPROBE_DEFER)
	return -EPROBE_DEFER;

	nop->reset_active_low = flags & OF_GPIO_ACTIVE_LOW;

	} else if (pdata) {
	type = pdata->type;
	clk_rate = pdata->clk_rate;
	needs_vcc = pdata->needs_vcc;
	nop->gpio_reset = pdata->gpio_reset;
	} else {
	nop->gpio_reset = -1;
	}

	nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
	GFP_KERNEL);
	if (!nop->phy.otg)
	return -ENOMEM;

	nop->clk = devm_clk_get(dev, "main_clk");
	if (IS_ERR(nop->clk)) {
	dev_dbg(dev, "Can't get phy clock: %ld\n",
	PTR_ERR(nop->clk));
	}

	if (!IS_ERR(nop->clk) && clk_rate) {
	err = clk_set_rate(nop->clk, clk_rate);
	if (err) {
	dev_err(dev, "Error setting clock rate\n");
	return err;
	}
	}

	nop->vcc = devm_regulator_get(dev, "vcc");
	if (IS_ERR(nop->vcc)) {
	dev_dbg(dev, "Error getting vcc regulator: %ld\n",
	PTR_ERR(nop->vcc));
	if (needs_vcc)
	return -EPROBE_DEFER;
	}

	if (gpio_is_valid(nop->gpio_reset)) {
	unsigned long gpio_flags;

	/* Assert RESET */
	if (nop->reset_active_low)
	gpio_flags = GPIOF_OUT_INIT_LOW;
	else
	gpio_flags = GPIOF_OUT_INIT_HIGH;

	err = devm_gpio_request_one(dev, nop->gpio_reset,
	gpio_flags, dev_name(dev));
	if (err) {
	dev_err(dev, "Error requesting RESET GPIO %d\n",
	nop->gpio_reset);
	return err;
	}
	}

	nop->dev = dev;
	nop->phy.dev = nop->dev;
	nop->phy.label = "nop-xceiv";
	nop->phy.set_suspend = nop_set_suspend;
	nop->phy.state = OTG_STATE_UNDEFINED;
	nop->phy.type = type;

	nop->phy.otg->phy = &nop->phy;
	nop->phy.otg->set_host = nop_set_host;
	nop->phy.otg->set_peripheral = nop_set_peripheral;

	return 0;
	}
	EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy);

	static int usb_phy_gen_xceiv_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct usb_phy_gen_xceiv *nop;
	int err;

	nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
	if (!nop)
	return -ENOMEM;

	err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev));
	if (err)
	return err;

	nop->phy.init = usb_gen_phy_init;
	nop->phy.shutdown = usb_gen_phy_shutdown;

	err = usb_add_phy_dev(&nop->phy);
	if (err) {
	dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
	err);
	return err;
	}

	platform_set_drvdata(pdev, nop);

	return 0;
	}

	static int usb_phy_gen_xceiv_remove(struct platform_device *pdev)
	{
	struct usb_phy_gen_xceiv *nop = platform_get_drvdata(pdev);

	usb_remove_phy(&nop->phy);

	return 0;
	}

	static const struct of_device_id nop_xceiv_dt_ids[] = {
	{ .compatible = "usb-nop-xceiv" },
	{ }
	};

	MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);

	static struct platform_driver usb_phy_gen_xceiv_driver = {
	.probe = usb_phy_gen_xceiv_probe,
	.remove = usb_phy_gen_xceiv_remove,
	.driver = {
	.name = "usb_phy_gen_xceiv",
	.owner = THIS_MODULE,
	.of_match_table = nop_xceiv_dt_ids,
	},
	};

	static int __init usb_phy_gen_xceiv_init(void)
	{
	return platform_driver_register(&usb_phy_gen_xceiv_driver);
	}
	subsys_initcall(usb_phy_gen_xceiv_init);

	static void __exit usb_phy_gen_xceiv_exit(void)
	{
	platform_driver_unregister(&usb_phy_gen_xceiv_driver);
	}
	module_exit(usb_phy_gen_xceiv_exit);

	MODULE_ALIAS("platform:usb_phy_gen_xceiv");
	MODULE_AUTHOR("Texas Instruments Inc");
	MODULE_DESCRIPTION("NOP USB Transceiver driver");
	MODULE_LICENSE("GPL");