Commit | Line | Data |
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c0efd232 LP |
1 | /* |
2 | * uvc_status.c -- USB Video Class driver - Status endpoint | |
3 | * | |
4 | * Copyright (C) 2007-2008 | |
5 | * Laurent Pinchart (laurent.pinchart@skynet.be) | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/version.h> | |
16 | #include <linux/input.h> | |
17 | #include <linux/usb.h> | |
18 | #include <linux/usb/input.h> | |
19 | ||
20 | #include "uvcvideo.h" | |
21 | ||
22 | /* -------------------------------------------------------------------------- | |
23 | * Input device | |
24 | */ | |
25 | static int uvc_input_init(struct uvc_device *dev) | |
26 | { | |
27 | struct usb_device *udev = dev->udev; | |
28 | struct input_dev *input; | |
29 | char *phys = NULL; | |
30 | int ret; | |
31 | ||
32 | input = input_allocate_device(); | |
33 | if (input == NULL) | |
34 | return -ENOMEM; | |
35 | ||
36 | phys = kmalloc(6 + strlen(udev->bus->bus_name) + strlen(udev->devpath), | |
37 | GFP_KERNEL); | |
38 | if (phys == NULL) { | |
39 | ret = -ENOMEM; | |
40 | goto error; | |
41 | } | |
42 | sprintf(phys, "usb-%s-%s", udev->bus->bus_name, udev->devpath); | |
43 | ||
44 | input->name = dev->name; | |
45 | input->phys = phys; | |
46 | usb_to_input_id(udev, &input->id); | |
47 | input->dev.parent = &dev->intf->dev; | |
48 | ||
49 | set_bit(EV_KEY, input->evbit); | |
50 | set_bit(BTN_0, input->keybit); | |
51 | ||
52 | if ((ret = input_register_device(input)) < 0) | |
53 | goto error; | |
54 | ||
55 | dev->input = input; | |
56 | return 0; | |
57 | ||
58 | error: | |
59 | input_free_device(input); | |
60 | kfree(phys); | |
61 | return ret; | |
62 | } | |
63 | ||
64 | static void uvc_input_cleanup(struct uvc_device *dev) | |
65 | { | |
66 | if (dev->input) | |
67 | input_unregister_device(dev->input); | |
68 | } | |
69 | ||
70 | /* -------------------------------------------------------------------------- | |
71 | * Status interrupt endpoint | |
72 | */ | |
73 | static void uvc_event_streaming(struct uvc_device *dev, __u8 *data, int len) | |
74 | { | |
75 | if (len < 3) { | |
76 | uvc_trace(UVC_TRACE_STATUS, "Invalid streaming status event " | |
77 | "received.\n"); | |
78 | return; | |
79 | } | |
80 | ||
81 | if (data[2] == 0) { | |
82 | if (len < 4) | |
83 | return; | |
84 | uvc_trace(UVC_TRACE_STATUS, "Button (intf %u) %s len %d\n", | |
85 | data[1], data[3] ? "pressed" : "released", len); | |
86 | if (dev->input) | |
87 | input_report_key(dev->input, BTN_0, data[3]); | |
88 | } else { | |
89 | uvc_trace(UVC_TRACE_STATUS, "Stream %u error event %02x %02x " | |
90 | "len %d.\n", data[1], data[2], data[3], len); | |
91 | } | |
92 | } | |
93 | ||
94 | static void uvc_event_control(struct uvc_device *dev, __u8 *data, int len) | |
95 | { | |
96 | char *attrs[3] = { "value", "info", "failure" }; | |
97 | ||
98 | if (len < 6 || data[2] != 0 || data[4] > 2) { | |
99 | uvc_trace(UVC_TRACE_STATUS, "Invalid control status event " | |
100 | "received.\n"); | |
101 | return; | |
102 | } | |
103 | ||
104 | uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n", | |
105 | data[1], data[3], attrs[data[4]], len); | |
106 | } | |
107 | ||
108 | static void uvc_status_complete(struct urb *urb) | |
109 | { | |
110 | struct uvc_device *dev = urb->context; | |
111 | int len, ret; | |
112 | ||
113 | switch (urb->status) { | |
114 | case 0: | |
115 | break; | |
116 | ||
117 | case -ENOENT: /* usb_kill_urb() called. */ | |
118 | case -ECONNRESET: /* usb_unlink_urb() called. */ | |
119 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | |
120 | case -EPROTO: /* Device is disconnected (reported by some | |
121 | * host controller). */ | |
122 | return; | |
123 | ||
124 | default: | |
125 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in status " | |
126 | "completion handler.\n", urb->status); | |
127 | return; | |
128 | } | |
129 | ||
130 | len = urb->actual_length; | |
131 | if (len > 0) { | |
132 | switch (dev->status[0] & 0x0f) { | |
133 | case UVC_STATUS_TYPE_CONTROL: | |
134 | uvc_event_control(dev, dev->status, len); | |
135 | break; | |
136 | ||
137 | case UVC_STATUS_TYPE_STREAMING: | |
138 | uvc_event_streaming(dev, dev->status, len); | |
139 | break; | |
140 | ||
141 | default: | |
142 | uvc_printk(KERN_INFO, "unknown event type %u.\n", | |
143 | dev->status[0]); | |
144 | break; | |
145 | } | |
146 | } | |
147 | ||
148 | /* Resubmit the URB. */ | |
149 | urb->interval = dev->int_ep->desc.bInterval; | |
150 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
151 | uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n", | |
152 | ret); | |
153 | } | |
154 | } | |
155 | ||
156 | int uvc_status_init(struct uvc_device *dev) | |
157 | { | |
158 | struct usb_host_endpoint *ep = dev->int_ep; | |
159 | unsigned int pipe; | |
160 | int interval; | |
161 | ||
162 | if (ep == NULL) | |
163 | return 0; | |
164 | ||
165 | uvc_input_init(dev); | |
166 | ||
167 | dev->int_urb = usb_alloc_urb(0, GFP_KERNEL); | |
168 | if (dev->int_urb == NULL) | |
169 | return -ENOMEM; | |
170 | ||
171 | pipe = usb_rcvintpipe(dev->udev, ep->desc.bEndpointAddress); | |
172 | ||
173 | /* For high-speed interrupt endpoints, the bInterval value is used as | |
174 | * an exponent of two. Some developers forgot about it. | |
175 | */ | |
176 | interval = ep->desc.bInterval; | |
177 | if (interval > 16 && dev->udev->speed == USB_SPEED_HIGH && | |
178 | (dev->quirks & UVC_QUIRK_STATUS_INTERVAL)) | |
179 | interval = fls(interval) - 1; | |
180 | ||
181 | usb_fill_int_urb(dev->int_urb, dev->udev, pipe, | |
182 | dev->status, sizeof dev->status, uvc_status_complete, | |
183 | dev, interval); | |
184 | ||
185 | return usb_submit_urb(dev->int_urb, GFP_KERNEL); | |
186 | } | |
187 | ||
188 | void uvc_status_cleanup(struct uvc_device *dev) | |
189 | { | |
190 | usb_kill_urb(dev->int_urb); | |
191 | usb_free_urb(dev->int_urb); | |
192 | uvc_input_cleanup(dev); | |
193 | } | |
194 | ||
195 | int uvc_status_suspend(struct uvc_device *dev) | |
196 | { | |
197 | usb_kill_urb(dev->int_urb); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | int uvc_status_resume(struct uvc_device *dev) | |
202 | { | |
203 | if (dev->int_urb == NULL) | |
204 | return 0; | |
205 | ||
206 | return usb_submit_urb(dev->int_urb, GFP_KERNEL); | |
207 | } |