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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 |
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 | ||
cccad6d4 | 135 | ATOMIC_INIT_NOTIFIER_HEAD(&nop->otg.notifier); |
20831ad2 | 136 | |
f6d92a05 AKG |
137 | return 0; |
138 | exit: | |
139 | kfree(nop); | |
140 | return err; | |
141 | } | |
142 | ||
143 | static int __devexit nop_usb_xceiv_remove(struct platform_device *pdev) | |
144 | { | |
145 | struct nop_usb_xceiv *nop = platform_get_drvdata(pdev); | |
146 | ||
147 | otg_set_transceiver(NULL); | |
148 | ||
149 | platform_set_drvdata(pdev, NULL); | |
150 | kfree(nop); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static struct platform_driver nop_usb_xceiv_driver = { | |
156 | .probe = nop_usb_xceiv_probe, | |
157 | .remove = __devexit_p(nop_usb_xceiv_remove), | |
158 | .driver = { | |
159 | .name = "nop_usb_xceiv", | |
160 | .owner = THIS_MODULE, | |
161 | }, | |
162 | }; | |
163 | ||
164 | static int __init nop_usb_xceiv_init(void) | |
165 | { | |
166 | return platform_driver_register(&nop_usb_xceiv_driver); | |
167 | } | |
168 | subsys_initcall(nop_usb_xceiv_init); | |
169 | ||
170 | static void __exit nop_usb_xceiv_exit(void) | |
171 | { | |
172 | platform_driver_unregister(&nop_usb_xceiv_driver); | |
173 | } | |
174 | module_exit(nop_usb_xceiv_exit); | |
175 | ||
176 | MODULE_ALIAS("platform:nop_usb_xceiv"); | |
177 | MODULE_AUTHOR("Texas Instruments Inc"); | |
178 | MODULE_DESCRIPTION("NOP USB Transceiver driver"); | |
179 | MODULE_LICENSE("GPL"); |