[net-next-2.6.git] / drivers / usb / otg / nop-usb-xceiv.c

/*
 * 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/slab.h>

struct nop_usb_xceiv {
	struct otg_transceiver	otg;
	struct device		*dev;
};

static struct platform_device *pd;

void usb_nop_xceiv_register(void)
{
	if (pd)
		return;
	pd = platform_device_register_simple("nop_usb_xceiv", -1, NULL, 0);
	if (!pd) {
		printk(KERN_ERR "Unable to register usb nop transceiver\n");
		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 inline struct nop_usb_xceiv *xceiv_to_nop(struct otg_transceiver *x)
{
	return container_of(x, struct nop_usb_xceiv, otg);
}

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

static int nop_set_peripheral(struct otg_transceiver *x,
		struct usb_gadget *gadget)
{
	struct nop_usb_xceiv *nop;

	if (!x)
		return -ENODEV;

	nop = xceiv_to_nop(x);

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

	nop->otg.gadget = gadget;
	nop->otg.state = OTG_STATE_B_IDLE;
	return 0;
}

static int nop_set_host(struct otg_transceiver *x, struct usb_bus *host)
{
	struct nop_usb_xceiv *nop;

	if (!x)
		return -ENODEV;

	nop = xceiv_to_nop(x);

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

	nop->otg.host = host;
	return 0;
}

static int __devinit nop_usb_xceiv_probe(struct platform_device *pdev)
{
	struct nop_usb_xceiv	*nop;
	int err;

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

	nop->dev		= &pdev->dev;
	nop->otg.dev		= nop->dev;
	nop->otg.label		= "nop-xceiv";
	nop->otg.state		= OTG_STATE_UNDEFINED;
	nop->otg.set_host	= nop_set_host;
	nop->otg.set_peripheral	= nop_set_peripheral;
	nop->otg.set_suspend	= nop_set_suspend;

	err = otg_set_transceiver(&nop->otg);
	if (err) {
		dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
			err);
		goto exit;
	}

	platform_set_drvdata(pdev, nop);

	return 0;
exit:
	kfree(nop);
	return err;
}

static int __devexit nop_usb_xceiv_remove(struct platform_device *pdev)
{
	struct nop_usb_xceiv *nop = platform_get_drvdata(pdev);

	otg_set_transceiver(NULL);

	platform_set_drvdata(pdev, NULL);
	kfree(nop);

	return 0;
}

static struct platform_driver nop_usb_xceiv_driver = {
	.probe		= nop_usb_xceiv_probe,
	.remove		= __devexit_p(nop_usb_xceiv_remove),
	.driver		= {
		.name	= "nop_usb_xceiv",
		.owner	= THIS_MODULE,
	},
};

static int __init nop_usb_xceiv_init(void)
{
	return platform_driver_register(&nop_usb_xceiv_driver);
}
subsys_initcall(nop_usb_xceiv_init);

static void __exit nop_usb_xceiv_exit(void)
{
	platform_driver_unregister(&nop_usb_xceiv_driver);
}
module_exit(nop_usb_xceiv_exit);

MODULE_ALIAS("platform:nop_usb_xceiv");
MODULE_AUTHOR("Texas Instruments Inc");
MODULE_DESCRIPTION("NOP USB Transceiver driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
f6d92a05 AKG	1	/*
	2	* drivers/usb/otg/nop-usb-xceiv.c
	3	*
	4	* NOP USB transceiver for all USB transceiver which are either built-in
	5	* into USB IP or which are mostly autonomous.
	6	*
	7	* Copyright (C) 2009 Texas Instruments Inc
	8	* Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	23	*
	24	* Current status:
cc835e32 DB	25	* This provides a "nop" transceiver for PHYs which are
cc835e32 DB	26	* autonomous such as isp1504, isp1707, etc.
f6d92a05 AKG	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/platform_device.h>
	31	#include <linux/dma-mapping.h>
	32	#include <linux/usb/otg.h>
5a0e3ad6	33	#include <linux/slab.h>
f6d92a05 AKG	34
	35	struct nop_usb_xceiv {
	36	struct otg_transceiver otg;
	37	struct device *dev;
	38	};
	39
cc835e32	40	static struct platform_device *pd;
f6d92a05 AKG	41
	42	void usb_nop_xceiv_register(void)
	43	{
cc835e32 DB	44	if (pd)
	45	return;
	46	pd = platform_device_register_simple("nop_usb_xceiv", -1, NULL, 0);
	47	if (!pd) {
f6d92a05 AKG	48	printk(KERN_ERR "Unable to register usb nop transceiver\n");
	49	return;
	50	}
	51	}
cc835e32	52	EXPORT_SYMBOL(usb_nop_xceiv_register);
f6d92a05 AKG	53
	54	void usb_nop_xceiv_unregister(void)
	55	{
cc835e32	56	platform_device_unregister(pd);
dc7520c1	57	pd = NULL;
f6d92a05	58	}
cc835e32	59	EXPORT_SYMBOL(usb_nop_xceiv_unregister);
f6d92a05 AKG	60
	61	static inline struct nop_usb_xceiv xceiv_to_nop(struct otg_transceiver x)
	62	{
	63	return container_of(x, struct nop_usb_xceiv, otg);
	64	}
	65
	66	static int nop_set_suspend(struct otg_transceiver *x, int suspend)
	67	{
	68	return 0;
	69	}
	70
	71	static int nop_set_peripheral(struct otg_transceiver *x,
	72	struct usb_gadget *gadget)
	73	{
	74	struct nop_usb_xceiv *nop;
	75
	76	if (!x)
	77	return -ENODEV;
	78
	79	nop = xceiv_to_nop(x);
	80
	81	if (!gadget) {
	82	nop->otg.gadget = NULL;
	83	return -ENODEV;
	84	}
	85
	86	nop->otg.gadget = gadget;
	87	nop->otg.state = OTG_STATE_B_IDLE;
	88	return 0;
	89	}
	90
	91	static int nop_set_host(struct otg_transceiver x, struct usb_bus host)
	92	{
	93	struct nop_usb_xceiv *nop;
	94
	95	if (!x)
	96	return -ENODEV;
	97
	98	nop = xceiv_to_nop(x);
	99
	100	if (!host) {
	101	nop->otg.host = NULL;
	102	return -ENODEV;
	103	}
	104
	105	nop->otg.host = host;
	106	return 0;
	107	}
	108
	109	static int __devinit nop_usb_xceiv_probe(struct platform_device *pdev)
	110	{
	111	struct nop_usb_xceiv *nop;
	112	int err;
	113
	114	nop = kzalloc(sizeof *nop, GFP_KERNEL);
	115	if (!nop)
	116	return -ENOMEM;
	117
	118	nop->dev = &pdev->dev;
	119	nop->otg.dev = nop->dev;
	120	nop->otg.label = "nop-xceiv";
	121	nop->otg.state = OTG_STATE_UNDEFINED;
	122	nop->otg.set_host = nop_set_host;
	123	nop->otg.set_peripheral = nop_set_peripheral;
124	nop->otg.set_suspend = nop_set_suspend;
125
126	err = otg_set_transceiver(&nop->otg);
127	if (err) {
128	dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
129	err);
130	goto exit;
131	}
132
133	platform_set_drvdata(pdev, nop);
134
135	return 0;
136	exit:
137	kfree(nop);
138	return err;
139	}
140
141	static int __devexit nop_usb_xceiv_remove(struct platform_device *pdev)
142	{
143	struct nop_usb_xceiv *nop = platform_get_drvdata(pdev);
144
145	otg_set_transceiver(NULL);
146
147	platform_set_drvdata(pdev, NULL);
148	kfree(nop);
149
150	return 0;
151	}
152
153	static struct platform_driver nop_usb_xceiv_driver = {
154	.probe = nop_usb_xceiv_probe,
155	.remove = __devexit_p(nop_usb_xceiv_remove),
156	.driver = {
157	.name = "nop_usb_xceiv",
158	.owner = THIS_MODULE,
159	},
160	};
161
162	static int __init nop_usb_xceiv_init(void)
163	{
164	return platform_driver_register(&nop_usb_xceiv_driver);
165	}
166	subsys_initcall(nop_usb_xceiv_init);
167
168	static void __exit nop_usb_xceiv_exit(void)
169	{
170	platform_driver_unregister(&nop_usb_xceiv_driver);
171	}
172	module_exit(nop_usb_xceiv_exit);
173
174	MODULE_ALIAS("platform:nop_usb_xceiv");
175	MODULE_AUTHOR("Texas Instruments Inc");
176	MODULE_DESCRIPTION("NOP USB Transceiver driver");
177	MODULE_LICENSE("GPL");