usb: makefile cleanup
[linux-2.6.git] / drivers / usb / otg / nop-usb-xceiv.c
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:
25  *      This provides a "nop" transceiver for PHYs which are
26  *      autonomous such as isp1504, isp1707, etc.
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>
33 #include <linux/slab.h>
34
35 struct nop_usb_xceiv {
36         struct otg_transceiver  otg;
37         struct device           *dev;
38 };
39
40 static struct platform_device *pd;
41
42 void usb_nop_xceiv_register(void)
43 {
44         if (pd)
45                 return;
46         pd = platform_device_register_simple("nop_usb_xceiv", -1, NULL, 0);
47         if (!pd) {
48                 printk(KERN_ERR "Unable to register usb nop transceiver\n");
49                 return;
50         }
51 }
52 EXPORT_SYMBOL(usb_nop_xceiv_register);
53
54 void usb_nop_xceiv_unregister(void)
55 {
56         platform_device_unregister(pd);
57         pd = NULL;
58 }
59 EXPORT_SYMBOL(usb_nop_xceiv_unregister);
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");