tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/usb/nop-usb-xceiv.h>
34#include <linux/slab.h>
35
36struct nop_usb_xceiv {
37 struct usb_phy phy;
38 struct device *dev;
39};
40
41static struct platform_device *pd;
42
43void usb_nop_xceiv_register(void)
44{
45 if (pd)
46 return;
47 pd = platform_device_register_simple("nop_usb_xceiv", -1, NULL, 0);
48 if (!pd) {
49 printk(KERN_ERR "Unable to register usb nop transceiver\n");
50 return;
51 }
52}
53EXPORT_SYMBOL(usb_nop_xceiv_register);
54
55void usb_nop_xceiv_unregister(void)
56{
57 platform_device_unregister(pd);
58 pd = NULL;
59}
60EXPORT_SYMBOL(usb_nop_xceiv_unregister);
61
62static int nop_set_suspend(struct usb_phy *x, int suspend)
63{
64 return 0;
65}
66
67static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
68{
69 if (!otg)
70 return -ENODEV;
71
72 if (!gadget) {
73 otg->gadget = NULL;
74 return -ENODEV;
75 }
76
77 otg->gadget = gadget;
78 otg->phy->state = OTG_STATE_B_IDLE;
79 return 0;
80}
81
82static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
83{
84 if (!otg)
85 return -ENODEV;
86
87 if (!host) {
88 otg->host = NULL;
89 return -ENODEV;
90 }
91
92 otg->host = host;
93 return 0;
94}
95
96static int nop_usb_xceiv_probe(struct platform_device *pdev)
97{
98 struct nop_usb_xceiv_platform_data *pdata = pdev->dev.platform_data;
99 struct nop_usb_xceiv *nop;
100 enum usb_phy_type type = USB_PHY_TYPE_USB2;
101 int err;
102
103 nop = kzalloc(sizeof *nop, GFP_KERNEL);
104 if (!nop)
105 return -ENOMEM;
106
107 nop->phy.otg = kzalloc(sizeof *nop->phy.otg, GFP_KERNEL);
108 if (!nop->phy.otg) {
109 kfree(nop);
110 return -ENOMEM;
111 }
112
113 if (pdata)
114 type = pdata->type;
115
116 nop->dev = &pdev->dev;
117 nop->phy.dev = nop->dev;
118 nop->phy.label = "nop-xceiv";
119 nop->phy.set_suspend = nop_set_suspend;
120 nop->phy.state = OTG_STATE_UNDEFINED;
121
122 nop->phy.otg->phy = &nop->phy;
123 nop->phy.otg->set_host = nop_set_host;
124 nop->phy.otg->set_peripheral = nop_set_peripheral;
125
126 err = usb_add_phy(&nop->phy, type);
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 ATOMIC_INIT_NOTIFIER_HEAD(&nop->phy.notifier);
136
137 return 0;
138exit:
139 kfree(nop->phy.otg);
140 kfree(nop);
141 return err;
142}
143
144static int nop_usb_xceiv_remove(struct platform_device *pdev)
145{
146 struct nop_usb_xceiv *nop = platform_get_drvdata(pdev);
147
148 usb_remove_phy(&nop->phy);
149
150 platform_set_drvdata(pdev, NULL);
151 kfree(nop->phy.otg);
152 kfree(nop);
153
154 return 0;
155}
156
157static struct platform_driver nop_usb_xceiv_driver = {
158 .probe = nop_usb_xceiv_probe,
159 .remove = nop_usb_xceiv_remove,
160 .driver = {
161 .name = "nop_usb_xceiv",
162 .owner = THIS_MODULE,
163 },
164};
165
166static int __init nop_usb_xceiv_init(void)
167{
168 return platform_driver_register(&nop_usb_xceiv_driver);
169}
170subsys_initcall(nop_usb_xceiv_init);
171
172static void __exit nop_usb_xceiv_exit(void)
173{
174 platform_driver_unregister(&nop_usb_xceiv_driver);
175}
176module_exit(nop_usb_xceiv_exit);
177
178MODULE_ALIAS("platform:nop_usb_xceiv");
179MODULE_AUTHOR("Texas Instruments Inc");
180MODULE_DESCRIPTION("NOP USB Transceiver driver");
181MODULE_LICENSE("GPL");