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41c47d8c EM |
1 | /* huawei_cdc_ncm.c - handles Huawei devices using the CDC NCM protocol as |
2 | * transport layer. | |
3 | * Copyright (C) 2013 Enrico Mioso <mrkiko.rs@gmail.com> | |
4 | * | |
5 | * | |
6 | * ABSTRACT: | |
7 | * This driver handles devices resembling the CDC NCM standard, but | |
8 | * encapsulating another protocol inside it. An example are some Huawei 3G | |
9 | * devices, exposing an embedded AT channel where you can set up the NCM | |
10 | * connection. | |
11 | * This code has been heavily inspired by the cdc_mbim.c driver, which is | |
12 | * Copyright (c) 2012 Smith Micro Software, Inc. | |
13 | * Copyright (c) 2012 Bjørn Mork <bjorn@mork.no> | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * version 2 as published by the Free Software Foundation. | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/ethtool.h> | |
23 | #include <linux/if_vlan.h> | |
24 | #include <linux/ip.h> | |
25 | #include <linux/mii.h> | |
26 | #include <linux/usb.h> | |
27 | #include <linux/usb/cdc.h> | |
28 | #include <linux/usb/usbnet.h> | |
29 | #include <linux/usb/cdc-wdm.h> | |
30 | #include <linux/usb/cdc_ncm.h> | |
31 | ||
32 | /* Driver data */ | |
33 | struct huawei_cdc_ncm_state { | |
34 | struct cdc_ncm_ctx *ctx; | |
35 | atomic_t pmcount; | |
36 | struct usb_driver *subdriver; | |
37 | struct usb_interface *control; | |
38 | struct usb_interface *data; | |
39 | }; | |
40 | ||
41 | static int huawei_cdc_ncm_manage_power(struct usbnet *usbnet_dev, int on) | |
42 | { | |
43 | struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data; | |
44 | int rv; | |
45 | ||
46 | if ((on && atomic_add_return(1, &drvstate->pmcount) == 1) || | |
47 | (!on && atomic_dec_and_test(&drvstate->pmcount))) { | |
48 | rv = usb_autopm_get_interface(usbnet_dev->intf); | |
49 | usbnet_dev->intf->needs_remote_wakeup = on; | |
50 | if (!rv) | |
51 | usb_autopm_put_interface(usbnet_dev->intf); | |
52 | } | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static int huawei_cdc_ncm_wdm_manage_power(struct usb_interface *intf, | |
57 | int status) | |
58 | { | |
59 | struct usbnet *usbnet_dev = usb_get_intfdata(intf); | |
60 | ||
61 | /* can be called while disconnecting */ | |
62 | if (!usbnet_dev) | |
63 | return 0; | |
64 | ||
65 | return huawei_cdc_ncm_manage_power(usbnet_dev, status); | |
66 | } | |
67 | ||
68 | ||
69 | static int huawei_cdc_ncm_bind(struct usbnet *usbnet_dev, | |
70 | struct usb_interface *intf) | |
71 | { | |
72 | struct cdc_ncm_ctx *ctx; | |
73 | struct usb_driver *subdriver = ERR_PTR(-ENODEV); | |
74 | int ret = -ENODEV; | |
75 | struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data; | |
76 | ||
77 | /* altsetting should always be 1 for NCM devices - so we hard-coded | |
78 | * it here | |
79 | */ | |
80 | ret = cdc_ncm_bind_common(usbnet_dev, intf, 1); | |
81 | if (ret) | |
82 | goto err; | |
83 | ||
84 | ctx = drvstate->ctx; | |
85 | ||
86 | if (usbnet_dev->status) | |
87 | /* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 | |
88 | * decimal (0x100)" | |
89 | */ | |
90 | subdriver = usb_cdc_wdm_register(ctx->control, | |
91 | &usbnet_dev->status->desc, | |
92 | 256, /* wMaxCommand */ | |
93 | huawei_cdc_ncm_wdm_manage_power); | |
94 | if (IS_ERR(subdriver)) { | |
95 | ret = PTR_ERR(subdriver); | |
96 | cdc_ncm_unbind(usbnet_dev, intf); | |
97 | goto err; | |
98 | } | |
99 | ||
100 | /* Prevent usbnet from using the status descriptor */ | |
101 | usbnet_dev->status = NULL; | |
102 | ||
103 | drvstate->subdriver = subdriver; | |
104 | ||
105 | err: | |
106 | return ret; | |
107 | } | |
108 | ||
109 | static void huawei_cdc_ncm_unbind(struct usbnet *usbnet_dev, | |
110 | struct usb_interface *intf) | |
111 | { | |
112 | struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data; | |
113 | struct cdc_ncm_ctx *ctx = drvstate->ctx; | |
114 | ||
115 | if (drvstate->subdriver && drvstate->subdriver->disconnect) | |
116 | drvstate->subdriver->disconnect(ctx->control); | |
117 | drvstate->subdriver = NULL; | |
118 | ||
119 | cdc_ncm_unbind(usbnet_dev, intf); | |
120 | } | |
121 | ||
122 | static int huawei_cdc_ncm_suspend(struct usb_interface *intf, | |
123 | pm_message_t message) | |
124 | { | |
125 | int ret = 0; | |
126 | struct usbnet *usbnet_dev = usb_get_intfdata(intf); | |
127 | struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data; | |
128 | struct cdc_ncm_ctx *ctx = drvstate->ctx; | |
129 | ||
130 | if (ctx == NULL) { | |
131 | ret = -ENODEV; | |
132 | goto error; | |
133 | } | |
134 | ||
135 | ret = usbnet_suspend(intf, message); | |
136 | if (ret < 0) | |
137 | goto error; | |
138 | ||
139 | if (intf == ctx->control && | |
140 | drvstate->subdriver && | |
141 | drvstate->subdriver->suspend) | |
142 | ret = drvstate->subdriver->suspend(intf, message); | |
143 | if (ret < 0) | |
144 | usbnet_resume(intf); | |
145 | ||
146 | error: | |
147 | return ret; | |
148 | } | |
149 | ||
150 | static int huawei_cdc_ncm_resume(struct usb_interface *intf) | |
151 | { | |
152 | int ret = 0; | |
153 | struct usbnet *usbnet_dev = usb_get_intfdata(intf); | |
154 | struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data; | |
155 | bool callsub; | |
156 | struct cdc_ncm_ctx *ctx = drvstate->ctx; | |
157 | ||
158 | /* should we call subdriver's resume function? */ | |
159 | callsub = | |
160 | (intf == ctx->control && | |
161 | drvstate->subdriver && | |
162 | drvstate->subdriver->resume); | |
163 | ||
164 | if (callsub) | |
165 | ret = drvstate->subdriver->resume(intf); | |
166 | if (ret < 0) | |
167 | goto err; | |
168 | ret = usbnet_resume(intf); | |
169 | if (ret < 0 && callsub) | |
170 | drvstate->subdriver->suspend(intf, PMSG_SUSPEND); | |
171 | err: | |
172 | return ret; | |
173 | } | |
174 | ||
175 | static int huawei_cdc_ncm_check_connect(struct usbnet *usbnet_dev) | |
176 | { | |
177 | struct cdc_ncm_ctx *ctx; | |
178 | ||
179 | ctx = (struct cdc_ncm_ctx *)usbnet_dev->data[0]; | |
180 | ||
181 | if (ctx == NULL) | |
182 | return 1; /* disconnected */ | |
183 | ||
184 | return !ctx->connected; | |
185 | } | |
186 | ||
187 | static const struct driver_info huawei_cdc_ncm_info = { | |
188 | .description = "Huawei CDC NCM device", | |
189 | .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN, | |
190 | .bind = huawei_cdc_ncm_bind, | |
191 | .unbind = huawei_cdc_ncm_unbind, | |
192 | .check_connect = huawei_cdc_ncm_check_connect, | |
193 | .manage_power = huawei_cdc_ncm_manage_power, | |
194 | .rx_fixup = cdc_ncm_rx_fixup, | |
195 | .tx_fixup = cdc_ncm_tx_fixup, | |
196 | }; | |
197 | ||
198 | static const struct usb_device_id huawei_cdc_ncm_devs[] = { | |
199 | /* Huawei NCM devices disguised as vendor specific */ | |
200 | { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x16), | |
201 | .driver_info = (unsigned long)&huawei_cdc_ncm_info, | |
202 | }, | |
203 | { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x46), | |
204 | .driver_info = (unsigned long)&huawei_cdc_ncm_info, | |
205 | }, | |
206 | { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x76), | |
207 | .driver_info = (unsigned long)&huawei_cdc_ncm_info, | |
208 | }, | |
209 | ||
210 | /* Terminating entry */ | |
211 | { | |
212 | }, | |
213 | }; | |
214 | MODULE_DEVICE_TABLE(usb, huawei_cdc_ncm_devs); | |
215 | ||
216 | static struct usb_driver huawei_cdc_ncm_driver = { | |
217 | .name = "huawei_cdc_ncm", | |
218 | .id_table = huawei_cdc_ncm_devs, | |
219 | .probe = usbnet_probe, | |
220 | .disconnect = usbnet_disconnect, | |
221 | .suspend = huawei_cdc_ncm_suspend, | |
222 | .resume = huawei_cdc_ncm_resume, | |
223 | .reset_resume = huawei_cdc_ncm_resume, | |
224 | .supports_autosuspend = 1, | |
225 | .disable_hub_initiated_lpm = 1, | |
226 | }; | |
227 | module_usb_driver(huawei_cdc_ncm_driver); | |
228 | MODULE_AUTHOR("Enrico Mioso <mrkiko.rs@gmail.com>"); | |
229 | MODULE_DESCRIPTION("USB CDC NCM host driver with encapsulated protocol support"); | |
230 | MODULE_LICENSE("GPL"); |