Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
c0efd232 LP |
2 | /* |
3 | * uvc_status.c -- USB Video Class driver - Status endpoint | |
4 | * | |
11fc5baf LP |
5 | * Copyright (C) 2005-2009 |
6 | * Laurent Pinchart (laurent.pinchart@ideasonboard.com) | |
c0efd232 LP |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
c0efd232 | 10 | #include <linux/input.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
c0efd232 LP |
12 | #include <linux/usb.h> |
13 | #include <linux/usb/input.h> | |
14 | ||
15 | #include "uvcvideo.h" | |
16 | ||
17 | /* -------------------------------------------------------------------------- | |
18 | * Input device | |
19 | */ | |
6833c917 | 20 | #ifdef CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV |
c0efd232 LP |
21 | static int uvc_input_init(struct uvc_device *dev) |
22 | { | |
c0efd232 | 23 | struct input_dev *input; |
c0efd232 LP |
24 | int ret; |
25 | ||
26 | input = input_allocate_device(); | |
27 | if (input == NULL) | |
28 | return -ENOMEM; | |
29 | ||
f1801523 LP |
30 | usb_make_path(dev->udev, dev->input_phys, sizeof(dev->input_phys)); |
31 | strlcat(dev->input_phys, "/button", sizeof(dev->input_phys)); | |
c0efd232 LP |
32 | |
33 | input->name = dev->name; | |
f1801523 LP |
34 | input->phys = dev->input_phys; |
35 | usb_to_input_id(dev->udev, &input->id); | |
c0efd232 LP |
36 | input->dev.parent = &dev->intf->dev; |
37 | ||
74ca11c2 BN |
38 | __set_bit(EV_KEY, input->evbit); |
39 | __set_bit(KEY_CAMERA, input->keybit); | |
c0efd232 LP |
40 | |
41 | if ((ret = input_register_device(input)) < 0) | |
42 | goto error; | |
43 | ||
44 | dev->input = input; | |
45 | return 0; | |
46 | ||
47 | error: | |
48 | input_free_device(input); | |
c0efd232 LP |
49 | return ret; |
50 | } | |
51 | ||
10e1fdb9 | 52 | static void uvc_input_unregister(struct uvc_device *dev) |
c0efd232 LP |
53 | { |
54 | if (dev->input) | |
55 | input_unregister_device(dev->input); | |
56 | } | |
57 | ||
6833c917 LP |
58 | static void uvc_input_report_key(struct uvc_device *dev, unsigned int code, |
59 | int value) | |
60 | { | |
74ca11c2 | 61 | if (dev->input) { |
6833c917 | 62 | input_report_key(dev->input, code, value); |
74ca11c2 BN |
63 | input_sync(dev->input); |
64 | } | |
6833c917 LP |
65 | } |
66 | ||
67 | #else | |
68 | #define uvc_input_init(dev) | |
10e1fdb9 | 69 | #define uvc_input_unregister(dev) |
6833c917 LP |
70 | #define uvc_input_report_key(dev, code, value) |
71 | #endif /* CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV */ | |
72 | ||
c0efd232 LP |
73 | /* -------------------------------------------------------------------------- |
74 | * Status interrupt endpoint | |
75 | */ | |
e5225c82 GL |
76 | struct uvc_streaming_status { |
77 | u8 bStatusType; | |
78 | u8 bOriginator; | |
79 | u8 bEvent; | |
80 | u8 bValue[]; | |
81 | } __packed; | |
82 | ||
83 | struct uvc_control_status { | |
84 | u8 bStatusType; | |
85 | u8 bOriginator; | |
86 | u8 bEvent; | |
87 | u8 bSelector; | |
88 | u8 bAttribute; | |
89 | u8 bValue[]; | |
90 | } __packed; | |
91 | ||
92 | static void uvc_event_streaming(struct uvc_device *dev, | |
93 | struct uvc_streaming_status *status, int len) | |
c0efd232 LP |
94 | { |
95 | if (len < 3) { | |
96 | uvc_trace(UVC_TRACE_STATUS, "Invalid streaming status event " | |
97 | "received.\n"); | |
98 | return; | |
99 | } | |
100 | ||
e5225c82 | 101 | if (status->bEvent == 0) { |
c0efd232 LP |
102 | if (len < 4) |
103 | return; | |
104 | uvc_trace(UVC_TRACE_STATUS, "Button (intf %u) %s len %d\n", | |
e5225c82 GL |
105 | status->bOriginator, |
106 | status->bValue[0] ? "pressed" : "released", len); | |
107 | uvc_input_report_key(dev, KEY_CAMERA, status->bValue[0]); | |
c0efd232 | 108 | } else { |
0393e735 LP |
109 | uvc_trace(UVC_TRACE_STATUS, |
110 | "Stream %u error event %02x len %d.\n", | |
e5225c82 GL |
111 | status->bOriginator, status->bEvent, len); |
112 | } | |
113 | } | |
114 | ||
115 | #define UVC_CTRL_VALUE_CHANGE 0 | |
116 | #define UVC_CTRL_INFO_CHANGE 1 | |
117 | #define UVC_CTRL_FAILURE_CHANGE 2 | |
118 | #define UVC_CTRL_MIN_CHANGE 3 | |
119 | #define UVC_CTRL_MAX_CHANGE 4 | |
120 | ||
121 | static struct uvc_control *uvc_event_entity_find_ctrl(struct uvc_entity *entity, | |
122 | u8 selector) | |
123 | { | |
124 | struct uvc_control *ctrl; | |
125 | unsigned int i; | |
126 | ||
127 | for (i = 0, ctrl = entity->controls; i < entity->ncontrols; i++, ctrl++) | |
128 | if (ctrl->info.selector == selector) | |
129 | return ctrl; | |
130 | ||
131 | return NULL; | |
132 | } | |
133 | ||
134 | static struct uvc_control *uvc_event_find_ctrl(struct uvc_device *dev, | |
135 | const struct uvc_control_status *status, | |
136 | struct uvc_video_chain **chain) | |
137 | { | |
138 | list_for_each_entry((*chain), &dev->chains, list) { | |
139 | struct uvc_entity *entity; | |
140 | struct uvc_control *ctrl; | |
141 | ||
142 | list_for_each_entry(entity, &(*chain)->entities, chain) { | |
143 | if (entity->id != status->bOriginator) | |
144 | continue; | |
145 | ||
146 | ctrl = uvc_event_entity_find_ctrl(entity, | |
147 | status->bSelector); | |
148 | if (ctrl) | |
149 | return ctrl; | |
150 | } | |
c0efd232 | 151 | } |
e5225c82 GL |
152 | |
153 | return NULL; | |
c0efd232 LP |
154 | } |
155 | ||
e5225c82 GL |
156 | static bool uvc_event_control(struct urb *urb, |
157 | const struct uvc_control_status *status, int len) | |
c0efd232 | 158 | { |
e5225c82 GL |
159 | static const char *attrs[] = { "value", "info", "failure", "min", "max" }; |
160 | struct uvc_device *dev = urb->context; | |
161 | struct uvc_video_chain *chain; | |
162 | struct uvc_control *ctrl; | |
c0efd232 | 163 | |
e5225c82 GL |
164 | if (len < 6 || status->bEvent != 0 || |
165 | status->bAttribute >= ARRAY_SIZE(attrs)) { | |
c0efd232 LP |
166 | uvc_trace(UVC_TRACE_STATUS, "Invalid control status event " |
167 | "received.\n"); | |
e5225c82 | 168 | return false; |
c0efd232 LP |
169 | } |
170 | ||
171 | uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n", | |
e5225c82 GL |
172 | status->bOriginator, status->bSelector, |
173 | attrs[status->bAttribute], len); | |
174 | ||
175 | /* Find the control. */ | |
176 | ctrl = uvc_event_find_ctrl(dev, status, &chain); | |
177 | if (!ctrl) | |
178 | return false; | |
179 | ||
180 | switch (status->bAttribute) { | |
181 | case UVC_CTRL_VALUE_CHANGE: | |
182 | return uvc_ctrl_status_event(urb, chain, ctrl, status->bValue); | |
183 | ||
184 | case UVC_CTRL_INFO_CHANGE: | |
185 | case UVC_CTRL_FAILURE_CHANGE: | |
186 | case UVC_CTRL_MIN_CHANGE: | |
187 | case UVC_CTRL_MAX_CHANGE: | |
188 | break; | |
189 | } | |
190 | ||
191 | return false; | |
c0efd232 LP |
192 | } |
193 | ||
194 | static void uvc_status_complete(struct urb *urb) | |
195 | { | |
196 | struct uvc_device *dev = urb->context; | |
197 | int len, ret; | |
198 | ||
199 | switch (urb->status) { | |
200 | case 0: | |
201 | break; | |
202 | ||
203 | case -ENOENT: /* usb_kill_urb() called. */ | |
204 | case -ECONNRESET: /* usb_unlink_urb() called. */ | |
205 | case -ESHUTDOWN: /* The endpoint is being disabled. */ | |
206 | case -EPROTO: /* Device is disconnected (reported by some | |
207 | * host controller). */ | |
208 | return; | |
209 | ||
210 | default: | |
211 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in status " | |
212 | "completion handler.\n", urb->status); | |
213 | return; | |
214 | } | |
215 | ||
216 | len = urb->actual_length; | |
217 | if (len > 0) { | |
218 | switch (dev->status[0] & 0x0f) { | |
e5225c82 GL |
219 | case UVC_STATUS_TYPE_CONTROL: { |
220 | struct uvc_control_status *status = | |
221 | (struct uvc_control_status *)dev->status; | |
222 | ||
223 | if (uvc_event_control(urb, status, len)) | |
224 | /* The URB will be resubmitted in work context. */ | |
225 | return; | |
c0efd232 | 226 | break; |
e5225c82 GL |
227 | } |
228 | ||
229 | case UVC_STATUS_TYPE_STREAMING: { | |
230 | struct uvc_streaming_status *status = | |
231 | (struct uvc_streaming_status *)dev->status; | |
c0efd232 | 232 | |
e5225c82 | 233 | uvc_event_streaming(dev, status, len); |
c0efd232 | 234 | break; |
e5225c82 | 235 | } |
c0efd232 LP |
236 | |
237 | default: | |
bd0232c1 LP |
238 | uvc_trace(UVC_TRACE_STATUS, "Unknown status event " |
239 | "type %u.\n", dev->status[0]); | |
c0efd232 LP |
240 | break; |
241 | } | |
242 | } | |
243 | ||
244 | /* Resubmit the URB. */ | |
245 | urb->interval = dev->int_ep->desc.bInterval; | |
246 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { | |
247 | uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n", | |
248 | ret); | |
249 | } | |
250 | } | |
251 | ||
252 | int uvc_status_init(struct uvc_device *dev) | |
253 | { | |
254 | struct usb_host_endpoint *ep = dev->int_ep; | |
255 | unsigned int pipe; | |
256 | int interval; | |
257 | ||
258 | if (ep == NULL) | |
259 | return 0; | |
260 | ||
261 | uvc_input_init(dev); | |
262 | ||
a31a4055 ML |
263 | dev->status = kzalloc(UVC_MAX_STATUS_SIZE, GFP_KERNEL); |
264 | if (dev->status == NULL) | |
265 | return -ENOMEM; | |
266 | ||
c0efd232 | 267 | dev->int_urb = usb_alloc_urb(0, GFP_KERNEL); |
a31a4055 ML |
268 | if (dev->int_urb == NULL) { |
269 | kfree(dev->status); | |
c0efd232 | 270 | return -ENOMEM; |
a31a4055 | 271 | } |
c0efd232 LP |
272 | |
273 | pipe = usb_rcvintpipe(dev->udev, ep->desc.bEndpointAddress); | |
274 | ||
275 | /* For high-speed interrupt endpoints, the bInterval value is used as | |
276 | * an exponent of two. Some developers forgot about it. | |
277 | */ | |
278 | interval = ep->desc.bInterval; | |
279 | if (interval > 16 && dev->udev->speed == USB_SPEED_HIGH && | |
280 | (dev->quirks & UVC_QUIRK_STATUS_INTERVAL)) | |
281 | interval = fls(interval) - 1; | |
282 | ||
283 | usb_fill_int_urb(dev->int_urb, dev->udev, pipe, | |
a31a4055 | 284 | dev->status, UVC_MAX_STATUS_SIZE, uvc_status_complete, |
c0efd232 LP |
285 | dev, interval); |
286 | ||
04a37e0f | 287 | return 0; |
c0efd232 LP |
288 | } |
289 | ||
10e1fdb9 | 290 | void uvc_status_unregister(struct uvc_device *dev) |
c0efd232 LP |
291 | { |
292 | usb_kill_urb(dev->int_urb); | |
10e1fdb9 DA |
293 | uvc_input_unregister(dev); |
294 | } | |
295 | ||
296 | void uvc_status_cleanup(struct uvc_device *dev) | |
297 | { | |
c0efd232 | 298 | usb_free_urb(dev->int_urb); |
a31a4055 | 299 | kfree(dev->status); |
c0efd232 LP |
300 | } |
301 | ||
17706f56 | 302 | int uvc_status_start(struct uvc_device *dev, gfp_t flags) |
04a37e0f LP |
303 | { |
304 | if (dev->int_urb == NULL) | |
305 | return 0; | |
306 | ||
17706f56 | 307 | return usb_submit_urb(dev->int_urb, flags); |
04a37e0f LP |
308 | } |
309 | ||
310 | void uvc_status_stop(struct uvc_device *dev) | |
c0efd232 LP |
311 | { |
312 | usb_kill_urb(dev->int_urb); | |
04a37e0f | 313 | } |