2 * drivers/usb/otg/nop-usb-xceiv.c
4 * NOP USB transceiver for all USB transceiver which are either built-in
5 * into USB IP or which are mostly autonomous.
7 * Copyright (C) 2009 Texas Instruments Inc
8 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
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.
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.
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.
25 * this is to add "nop" transceiver for all those phy which is
26 * autonomous such as isp1504 etc.
29 #include <linux/module.h>
30 #include <linux/platform_device.h>
31 #include <linux/dma-mapping.h>
32 #include <linux/usb/otg.h>
34 struct nop_usb_xceiv
{
35 struct otg_transceiver otg
;
39 static u64 nop_xceiv_dmamask
= DMA_BIT_MASK(32);
41 static struct platform_device nop_xceiv_device
= {
42 .name
= "nop_usb_xceiv",
45 .dma_mask
= &nop_xceiv_dmamask
,
46 .coherent_dma_mask
= DMA_BIT_MASK(32),
47 .platform_data
= NULL
,
51 void usb_nop_xceiv_register(void)
53 if (platform_device_register(&nop_xceiv_device
) < 0) {
54 printk(KERN_ERR
"Unable to register usb nop transceiver\n");
59 void usb_nop_xceiv_unregister(void)
61 platform_device_unregister(&nop_xceiv_device
);
64 static inline struct nop_usb_xceiv
*xceiv_to_nop(struct otg_transceiver
*x
)
66 return container_of(x
, struct nop_usb_xceiv
, otg
);
69 static int nop_set_suspend(struct otg_transceiver
*x
, int suspend
)
74 static int nop_set_peripheral(struct otg_transceiver
*x
,
75 struct usb_gadget
*gadget
)
77 struct nop_usb_xceiv
*nop
;
82 nop
= xceiv_to_nop(x
);
85 nop
->otg
.gadget
= NULL
;
89 nop
->otg
.gadget
= gadget
;
90 nop
->otg
.state
= OTG_STATE_B_IDLE
;
94 static int nop_set_host(struct otg_transceiver
*x
, struct usb_bus
*host
)
96 struct nop_usb_xceiv
*nop
;
101 nop
= xceiv_to_nop(x
);
104 nop
->otg
.host
= NULL
;
108 nop
->otg
.host
= host
;
112 static int __devinit
nop_usb_xceiv_probe(struct platform_device
*pdev
)
114 struct nop_usb_xceiv
*nop
;
117 nop
= kzalloc(sizeof *nop
, GFP_KERNEL
);
121 nop
->dev
= &pdev
->dev
;
122 nop
->otg
.dev
= nop
->dev
;
123 nop
->otg
.label
= "nop-xceiv";
124 nop
->otg
.state
= OTG_STATE_UNDEFINED
;
125 nop
->otg
.set_host
= nop_set_host
;
126 nop
->otg
.set_peripheral
= nop_set_peripheral
;
127 nop
->otg
.set_suspend
= nop_set_suspend
;
129 err
= otg_set_transceiver(&nop
->otg
);
131 dev_err(&pdev
->dev
, "can't register transceiver, err: %d\n",
136 platform_set_drvdata(pdev
, nop
);
144 static int __devexit
nop_usb_xceiv_remove(struct platform_device
*pdev
)
146 struct nop_usb_xceiv
*nop
= platform_get_drvdata(pdev
);
148 otg_set_transceiver(NULL
);
150 platform_set_drvdata(pdev
, NULL
);
156 static struct platform_driver nop_usb_xceiv_driver
= {
157 .probe
= nop_usb_xceiv_probe
,
158 .remove
= __devexit_p(nop_usb_xceiv_remove
),
160 .name
= "nop_usb_xceiv",
161 .owner
= THIS_MODULE
,
165 static int __init
nop_usb_xceiv_init(void)
167 return platform_driver_register(&nop_usb_xceiv_driver
);
169 subsys_initcall(nop_usb_xceiv_init
);
171 static void __exit
nop_usb_xceiv_exit(void)
173 platform_driver_unregister(&nop_usb_xceiv_driver
);
175 module_exit(nop_usb_xceiv_exit
);
177 MODULE_ALIAS("platform:nop_usb_xceiv");
178 MODULE_AUTHOR("Texas Instruments Inc");
179 MODULE_DESCRIPTION("NOP USB Transceiver driver");
180 MODULE_LICENSE("GPL");