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authorLinus Torvalds <torvalds@linux-foundation.org>2010-05-21 00:26:12 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-21 00:26:12 -0400
commit7a9b149212f3716c598afe973b6261fd58453b7a (patch)
tree477716d84c71da124448b72278e98da28aadbd3d /Documentation/usb
parent3d62e3fdce8ef265a3706c52ae1ca6ab84e30f0e (diff)
parente26bcf37234c67624f62d9fc95f922b8dbda1363 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6: (229 commits) USB: remove unused usb_buffer_alloc and usb_buffer_free macros usb: musb: update gfp/slab.h includes USB: ftdi_sio: fix legacy SIO-device header USB: kl5usb105: reimplement using generic framework USB: kl5usb105: minor clean ups USB: kl5usb105: fix memory leak USB: io_ti: use kfifo to implement write buffering USB: io_ti: remove unsused private counter USB: ti_usb: use kfifo to implement write buffering USB: ir-usb: fix incorrect write-buffer length USB: aircable: fix incorrect write-buffer length USB: safe_serial: straighten out read processing USB: safe_serial: reimplement read using generic framework USB: safe_serial: reimplement write using generic framework usb-storage: always print quirks USB: usb-storage: trivial debug improvements USB: oti6858: use port write fifo USB: oti6858: use kfifo to implement write buffering USB: cypress_m8: use kfifo to implement write buffering USB: cypress_m8: remove unused drain define ... Fix up conflicts (due to usb_buffer_alloc/free renaming) in drivers/input/tablet/acecad.c drivers/input/tablet/kbtab.c drivers/input/tablet/wacom_sys.c drivers/media/video/gspca/gspca.c sound/usb/usbaudio.c
Diffstat (limited to 'Documentation/usb')
-rw-r--r--Documentation/usb/bulk-streams.txt78
-rw-r--r--Documentation/usb/dma.txt22
-rw-r--r--Documentation/usb/gadget_hid.txt445
-rw-r--r--Documentation/usb/power-management.txt19
-rw-r--r--Documentation/usb/usb-serial.txt29
5 files changed, 567 insertions, 26 deletions
diff --git a/Documentation/usb/bulk-streams.txt b/Documentation/usb/bulk-streams.txt
new file mode 100644
index 000000000000..ffc02021863e
--- /dev/null
+++ b/Documentation/usb/bulk-streams.txt
@@ -0,0 +1,78 @@
1Background
2==========
3
4Bulk endpoint streams were added in the USB 3.0 specification. Streams allow a
5device driver to overload a bulk endpoint so that multiple transfers can be
6queued at once.
7
8Streams are defined in sections 4.4.6.4 and 8.12.1.4 of the Universal Serial Bus
93.0 specification at http://www.usb.org/developers/docs/ The USB Attached SCSI
10Protocol, which uses streams to queue multiple SCSI commands, can be found on
11the T10 website (http://t10.org/).
12
13
14Device-side implications
15========================
16
17Once a buffer has been queued to a stream ring, the device is notified (through
18an out-of-band mechanism on another endpoint) that data is ready for that stream
19ID. The device then tells the host which "stream" it wants to start. The host
20can also initiate a transfer on a stream without the device asking, but the
21device can refuse that transfer. Devices can switch between streams at any
22time.
23
24
25Driver implications
26===================
27
28int usb_alloc_streams(struct usb_interface *interface,
29 struct usb_host_endpoint **eps, unsigned int num_eps,
30 unsigned int num_streams, gfp_t mem_flags);
31
32Device drivers will call this API to request that the host controller driver
33allocate memory so the driver can use up to num_streams stream IDs. They must
34pass an array of usb_host_endpoints that need to be setup with similar stream
35IDs. This is to ensure that a UASP driver will be able to use the same stream
36ID for the bulk IN and OUT endpoints used in a Bi-directional command sequence.
37
38The return value is an error condition (if one of the endpoints doesn't support
39streams, or the xHCI driver ran out of memory), or the number of streams the
40host controller allocated for this endpoint. The xHCI host controller hardware
41declares how many stream IDs it can support, and each bulk endpoint on a
42SuperSpeed device will say how many stream IDs it can handle. Therefore,
43drivers should be able to deal with being allocated less stream IDs than they
44requested.
45
46Do NOT call this function if you have URBs enqueued for any of the endpoints
47passed in as arguments. Do not call this function to request less than two
48streams.
49
50Drivers will only be allowed to call this API once for the same endpoint
51without calling usb_free_streams(). This is a simplification for the xHCI host
52controller driver, and may change in the future.
53
54
55Picking new Stream IDs to use
56============================
57
58Stream ID 0 is reserved, and should not be used to communicate with devices. If
59usb_alloc_streams() returns with a value of N, you may use streams 1 though N.
60To queue an URB for a specific stream, set the urb->stream_id value. If the
61endpoint does not support streams, an error will be returned.
62
63Note that new API to choose the next stream ID will have to be added if the xHCI
64driver supports secondary stream IDs.
65
66
67Clean up
68========
69
70If a driver wishes to stop using streams to communicate with the device, it
71should call
72
73void usb_free_streams(struct usb_interface *interface,
74 struct usb_host_endpoint **eps, unsigned int num_eps,
75 gfp_t mem_flags);
76
77All stream IDs will be deallocated when the driver releases the interface, to
78ensure that drivers that don't support streams will be able to use the endpoint.
diff --git a/Documentation/usb/dma.txt b/Documentation/usb/dma.txt
index cfdcd16e3abf..84ef865237db 100644
--- a/Documentation/usb/dma.txt
+++ b/Documentation/usb/dma.txt
@@ -16,11 +16,11 @@ OR: they can now be DMA-aware.
16 manage dma mappings for existing dma-ready buffers (see below). 16 manage dma mappings for existing dma-ready buffers (see below).
17 17
18- URBs have an additional "transfer_dma" field, as well as a transfer_flags 18- URBs have an additional "transfer_dma" field, as well as a transfer_flags
19 bit saying if it's valid. (Control requests also have "setup_dma" and a 19 bit saying if it's valid. (Control requests also have "setup_dma", but
20 corresponding transfer_flags bit.) 20 drivers must not use it.)
21 21
22- "usbcore" will map those DMA addresses, if a DMA-aware driver didn't do 22- "usbcore" will map this DMA address, if a DMA-aware driver didn't do
23 it first and set URB_NO_TRANSFER_DMA_MAP or URB_NO_SETUP_DMA_MAP. HCDs 23 it first and set URB_NO_TRANSFER_DMA_MAP. HCDs
24 don't manage dma mappings for URBs. 24 don't manage dma mappings for URBs.
25 25
26- There's a new "generic DMA API", parts of which are usable by USB device 26- There's a new "generic DMA API", parts of which are usable by USB device
@@ -43,22 +43,16 @@ and effects like cache-trashing can impose subtle penalties.
43 kind of addresses to store in urb->transfer_buffer and urb->transfer_dma. 43 kind of addresses to store in urb->transfer_buffer and urb->transfer_dma.
44 You'd also set URB_NO_TRANSFER_DMA_MAP in urb->transfer_flags: 44 You'd also set URB_NO_TRANSFER_DMA_MAP in urb->transfer_flags:
45 45
46 void *usb_buffer_alloc (struct usb_device *dev, size_t size, 46 void *usb_alloc_coherent (struct usb_device *dev, size_t size,
47 int mem_flags, dma_addr_t *dma); 47 int mem_flags, dma_addr_t *dma);
48 48
49 void usb_buffer_free (struct usb_device *dev, size_t size, 49 void usb_free_coherent (struct usb_device *dev, size_t size,
50 void *addr, dma_addr_t dma); 50 void *addr, dma_addr_t dma);
51 51
52 Most drivers should *NOT* be using these primitives; they don't need 52 Most drivers should *NOT* be using these primitives; they don't need
53 to use this type of memory ("dma-coherent"), and memory returned from 53 to use this type of memory ("dma-coherent"), and memory returned from
54 kmalloc() will work just fine. 54 kmalloc() will work just fine.
55 55
56 For control transfers you can use the buffer primitives or not for each
57 of the transfer buffer and setup buffer independently. Set the flag bits
58 URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP to indicate which
59 buffers you have prepared. For non-control transfers URB_NO_SETUP_DMA_MAP
60 is ignored.
61
62 The memory buffer returned is "dma-coherent"; sometimes you might need to 56 The memory buffer returned is "dma-coherent"; sometimes you might need to
63 force a consistent memory access ordering by using memory barriers. It's 57 force a consistent memory access ordering by using memory barriers. It's
64 not using a streaming DMA mapping, so it's good for small transfers on 58 not using a streaming DMA mapping, so it's good for small transfers on
@@ -130,8 +124,8 @@ of Documentation/PCI/PCI-DMA-mapping.txt, titled "What memory is DMA-able?")
130 void usb_buffer_unmap (struct urb *urb); 124 void usb_buffer_unmap (struct urb *urb);
131 125
132 The calls manage urb->transfer_dma for you, and set URB_NO_TRANSFER_DMA_MAP 126 The calls manage urb->transfer_dma for you, and set URB_NO_TRANSFER_DMA_MAP
133 so that usbcore won't map or unmap the buffer. The same goes for 127 so that usbcore won't map or unmap the buffer. They cannot be used for
134 urb->setup_dma and URB_NO_SETUP_DMA_MAP for control requests. 128 setup_packet buffers in control requests.
135 129
136Note that several of those interfaces are currently commented out, since 130Note that several of those interfaces are currently commented out, since
137they don't have current users. See the source code. Other than the dmasync 131they don't have current users. See the source code. Other than the dmasync
diff --git a/Documentation/usb/gadget_hid.txt b/Documentation/usb/gadget_hid.txt
new file mode 100644
index 000000000000..f4a51f567427
--- /dev/null
+++ b/Documentation/usb/gadget_hid.txt
@@ -0,0 +1,445 @@
1
2 Linux USB HID gadget driver
3
4Introduction
5
6 The HID Gadget driver provides emulation of USB Human Interface
7 Devices (HID). The basic HID handling is done in the kernel,
8 and HID reports can be sent/received through I/O on the
9 /dev/hidgX character devices.
10
11 For more details about HID, see the developer page on
12 http://www.usb.org/developers/hidpage/
13
14Configuration
15
16 g_hid is a platform driver, so to use it you need to add
17 struct platform_device(s) to your platform code defining the
18 HID function descriptors you want to use - E.G. something
19 like:
20
21#include <linux/platform_device.h>
22#include <linux/usb/g_hid.h>
23
24/* hid descriptor for a keyboard */
25static struct hidg_func_descriptor my_hid_data = {
26 .subclass = 0, /* No subclass */
27 .protocol = 1, /* Keyboard */
28 .report_length = 8,
29 .report_desc_length = 63,
30 .report_desc = {
31 0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
32 0x09, 0x06, /* USAGE (Keyboard) */
33 0xa1, 0x01, /* COLLECTION (Application) */
34 0x05, 0x07, /* USAGE_PAGE (Keyboard) */
35 0x19, 0xe0, /* USAGE_MINIMUM (Keyboard LeftControl) */
36 0x29, 0xe7, /* USAGE_MAXIMUM (Keyboard Right GUI) */
37 0x15, 0x00, /* LOGICAL_MINIMUM (0) */
38 0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
39 0x75, 0x01, /* REPORT_SIZE (1) */
40 0x95, 0x08, /* REPORT_COUNT (8) */
41 0x81, 0x02, /* INPUT (Data,Var,Abs) */
42 0x95, 0x01, /* REPORT_COUNT (1) */
43 0x75, 0x08, /* REPORT_SIZE (8) */
44 0x81, 0x03, /* INPUT (Cnst,Var,Abs) */
45 0x95, 0x05, /* REPORT_COUNT (5) */
46 0x75, 0x01, /* REPORT_SIZE (1) */
47 0x05, 0x08, /* USAGE_PAGE (LEDs) */
48 0x19, 0x01, /* USAGE_MINIMUM (Num Lock) */
49 0x29, 0x05, /* USAGE_MAXIMUM (Kana) */
50 0x91, 0x02, /* OUTPUT (Data,Var,Abs) */
51 0x95, 0x01, /* REPORT_COUNT (1) */
52 0x75, 0x03, /* REPORT_SIZE (3) */
53 0x91, 0x03, /* OUTPUT (Cnst,Var,Abs) */
54 0x95, 0x06, /* REPORT_COUNT (6) */
55 0x75, 0x08, /* REPORT_SIZE (8) */
56 0x15, 0x00, /* LOGICAL_MINIMUM (0) */
57 0x25, 0x65, /* LOGICAL_MAXIMUM (101) */
58 0x05, 0x07, /* USAGE_PAGE (Keyboard) */
59 0x19, 0x00, /* USAGE_MINIMUM (Reserved) */
60 0x29, 0x65, /* USAGE_MAXIMUM (Keyboard Application) */
61 0x81, 0x00, /* INPUT (Data,Ary,Abs) */
62 0xc0 /* END_COLLECTION */
63 }
64};
65
66static struct platform_device my_hid = {
67 .name = "hidg",
68 .id = 0,
69 .num_resources = 0,
70 .resource = 0,
71 .dev.platform_data = &my_hid_data,
72};
73
74 You can add as many HID functions as you want, only limited by
75 the amount of interrupt endpoints your gadget driver supports.
76
77Send and receive HID reports
78
79 HID reports can be sent/received using read/write on the
80 /dev/hidgX character devices. See below for an example program
81 to do this.
82
83 hid_gadget_test is a small interactive program to test the HID
84 gadget driver. To use, point it at a hidg device and set the
85 device type (keyboard / mouse / joystick) - E.G.:
86
87 # hid_gadget_test /dev/hidg0 keyboard
88
89 You are now in the prompt of hid_gadget_test. You can type any
90 combination of options and values. Available options and
91 values are listed at program start. In keyboard mode you can
92 send up to six values.
93
94 For example type: g i s t r --left-shift
95
96 Hit return and the corresponding report will be sent by the
97 HID gadget.
98
99 Another interesting example is the caps lock test. Type
100 -–caps-lock and hit return. A report is then sent by the
101 gadget and you should receive the host answer, corresponding
102 to the caps lock LED status.
103
104 --caps-lock
105 recv report:2
106
107 With this command:
108
109 # hid_gadget_test /dev/hidg1 mouse
110
111 You can test the mouse emulation. Values are two signed numbers.
112
113
114Sample code
115
116/* hid_gadget_test */
117
118#include <pthread.h>
119#include <string.h>
120#include <stdio.h>
121#include <ctype.h>
122#include <fcntl.h>
123#include <errno.h>
124#include <stdio.h>
125#include <stdlib.h>
126#include <unistd.h>
127
128#define BUF_LEN 512
129
130struct options {
131 const char *opt;
132 unsigned char val;
133};
134
135static struct options kmod[] = {
136 {.opt = "--left-ctrl", .val = 0x01},
137 {.opt = "--right-ctrl", .val = 0x10},
138 {.opt = "--left-shift", .val = 0x02},
139 {.opt = "--right-shift", .val = 0x20},
140 {.opt = "--left-alt", .val = 0x04},
141 {.opt = "--right-alt", .val = 0x40},
142 {.opt = "--left-meta", .val = 0x08},
143 {.opt = "--right-meta", .val = 0x80},
144 {.opt = NULL}
145};
146
147static struct options kval[] = {
148 {.opt = "--return", .val = 0x28},
149 {.opt = "--esc", .val = 0x29},
150 {.opt = "--bckspc", .val = 0x2a},
151 {.opt = "--tab", .val = 0x2b},
152 {.opt = "--spacebar", .val = 0x2c},
153 {.opt = "--caps-lock", .val = 0x39},
154 {.opt = "--f1", .val = 0x3a},
155 {.opt = "--f2", .val = 0x3b},
156 {.opt = "--f3", .val = 0x3c},
157 {.opt = "--f4", .val = 0x3d},
158 {.opt = "--f5", .val = 0x3e},
159 {.opt = "--f6", .val = 0x3f},
160 {.opt = "--f7", .val = 0x40},
161 {.opt = "--f8", .val = 0x41},
162 {.opt = "--f9", .val = 0x42},
163 {.opt = "--f10", .val = 0x43},
164 {.opt = "--f11", .val = 0x44},
165 {.opt = "--f12", .val = 0x45},
166 {.opt = "--insert", .val = 0x49},
167 {.opt = "--home", .val = 0x4a},
168 {.opt = "--pageup", .val = 0x4b},
169 {.opt = "--del", .val = 0x4c},
170 {.opt = "--end", .val = 0x4d},
171 {.opt = "--pagedown", .val = 0x4e},
172 {.opt = "--right", .val = 0x4f},
173 {.opt = "--left", .val = 0x50},
174 {.opt = "--down", .val = 0x51},
175 {.opt = "--kp-enter", .val = 0x58},
176 {.opt = "--up", .val = 0x52},
177 {.opt = "--num-lock", .val = 0x53},
178 {.opt = NULL}
179};
180
181int keyboard_fill_report(char report[8], char buf[BUF_LEN], int *hold)
182{
183 char *tok = strtok(buf, " ");
184 int key = 0;
185 int i = 0;
186
187 for (; tok != NULL; tok = strtok(NULL, " ")) {
188
189 if (strcmp(tok, "--quit") == 0)
190 return -1;
191
192 if (strcmp(tok, "--hold") == 0) {
193 *hold = 1;
194 continue;
195 }
196
197 if (key < 6) {
198 for (i = 0; kval[i].opt != NULL; i++)
199 if (strcmp(tok, kval[i].opt) == 0) {
200 report[2 + key++] = kval[i].val;
201 break;
202 }
203 if (kval[i].opt != NULL)
204 continue;
205 }
206
207 if (key < 6)
208 if (islower(tok[0])) {
209 report[2 + key++] = (tok[0] - ('a' - 0x04));
210 continue;
211 }
212
213 for (i = 0; kmod[i].opt != NULL; i++)
214 if (strcmp(tok, kmod[i].opt) == 0) {
215 report[0] = report[0] | kmod[i].val;
216 break;
217 }
218 if (kmod[i].opt != NULL)
219 continue;
220
221 if (key < 6)
222 fprintf(stderr, "unknown option: %s\n", tok);
223 }
224 return 8;
225}
226
227static struct options mmod[] = {
228 {.opt = "--b1", .val = 0x01},
229 {.opt = "--b2", .val = 0x02},
230 {.opt = "--b3", .val = 0x04},
231 {.opt = NULL}
232};
233
234int mouse_fill_report(char report[8], char buf[BUF_LEN], int *hold)
235{
236 char *tok = strtok(buf, " ");
237 int mvt = 0;
238 int i = 0;
239 for (; tok != NULL; tok = strtok(NULL, " ")) {
240
241 if (strcmp(tok, "--quit") == 0)
242 return -1;
243
244 if (strcmp(tok, "--hold") == 0) {
245 *hold = 1;
246 continue;
247 }
248
249 for (i = 0; mmod[i].opt != NULL; i++)
250 if (strcmp(tok, mmod[i].opt) == 0) {
251 report[0] = report[0] | mmod[i].val;
252 break;
253 }
254 if (mmod[i].opt != NULL)
255 continue;
256
257 if (!(tok[0] == '-' && tok[1] == '-') && mvt < 2) {
258 errno = 0;
259 report[1 + mvt++] = (char)strtol(tok, NULL, 0);
260 if (errno != 0) {
261 fprintf(stderr, "Bad value:'%s'\n", tok);
262 report[1 + mvt--] = 0;
263 }
264 continue;
265 }
266
267 fprintf(stderr, "unknown option: %s\n", tok);
268 }
269 return 3;
270}
271
272static struct options jmod[] = {
273 {.opt = "--b1", .val = 0x10},
274 {.opt = "--b2", .val = 0x20},
275 {.opt = "--b3", .val = 0x40},
276 {.opt = "--b4", .val = 0x80},
277 {.opt = "--hat1", .val = 0x00},
278 {.opt = "--hat2", .val = 0x01},
279 {.opt = "--hat3", .val = 0x02},
280 {.opt = "--hat4", .val = 0x03},
281 {.opt = "--hatneutral", .val = 0x04},
282 {.opt = NULL}
283};
284
285int joystick_fill_report(char report[8], char buf[BUF_LEN], int *hold)
286{
287 char *tok = strtok(buf, " ");
288 int mvt = 0;
289 int i = 0;
290
291 *hold = 1;
292
293 /* set default hat position: neutral */
294 report[3] = 0x04;
295
296 for (; tok != NULL; tok = strtok(NULL, " ")) {
297
298 if (strcmp(tok, "--quit") == 0)
299 return -1;
300
301 for (i = 0; jmod[i].opt != NULL; i++)
302 if (strcmp(tok, jmod[i].opt) == 0) {
303 report[3] = (report[3] & 0xF0) | jmod[i].val;
304 break;
305 }
306 if (jmod[i].opt != NULL)
307 continue;
308
309 if (!(tok[0] == '-' && tok[1] == '-') && mvt < 3) {
310 errno = 0;
311 report[mvt++] = (char)strtol(tok, NULL, 0);
312 if (errno != 0) {
313 fprintf(stderr, "Bad value:'%s'\n", tok);
314 report[mvt--] = 0;
315 }
316 continue;
317 }
318
319 fprintf(stderr, "unknown option: %s\n", tok);
320 }
321 return 4;
322}
323
324void print_options(char c)
325{
326 int i = 0;
327
328 if (c == 'k') {
329 printf(" keyboard options:\n"
330 " --hold\n");
331 for (i = 0; kmod[i].opt != NULL; i++)
332 printf("\t\t%s\n", kmod[i].opt);
333 printf("\n keyboard values:\n"
334 " [a-z] or\n");
335 for (i = 0; kval[i].opt != NULL; i++)
336 printf("\t\t%-8s%s", kval[i].opt, i % 2 ? "\n" : "");
337 printf("\n");
338 } else if (c == 'm') {
339 printf(" mouse options:\n"
340 " --hold\n");
341 for (i = 0; mmod[i].opt != NULL; i++)
342 printf("\t\t%s\n", mmod[i].opt);
343 printf("\n mouse values:\n"
344 " Two signed numbers\n"
345 "--quit to close\n");
346 } else {
347 printf(" joystick options:\n");
348 for (i = 0; jmod[i].opt != NULL; i++)
349 printf("\t\t%s\n", jmod[i].opt);
350 printf("\n joystick values:\n"
351 " three signed numbers\n"
352 "--quit to close\n");
353 }
354}
355
356int main(int argc, const char *argv[])
357{
358 const char *filename = NULL;
359 int fd = 0;
360 char buf[BUF_LEN];
361 int cmd_len;
362 char report[8];
363 int to_send = 8;
364 int hold = 0;
365 fd_set rfds;
366 int retval, i;
367
368 if (argc < 3) {
369 fprintf(stderr, "Usage: %s devname mouse|keyboard|joystick\n",
370 argv[0]);
371 return 1;
372 }
373
374 if (argv[2][0] != 'k' && argv[2][0] != 'm' && argv[2][0] != 'j')
375 return 2;
376
377 filename = argv[1];
378
379 if ((fd = open(filename, O_RDWR, 0666)) == -1) {
380 perror(filename);
381 return 3;
382 }
383
384 print_options(argv[2][0]);
385
386 while (42) {
387
388 FD_ZERO(&rfds);
389 FD_SET(STDIN_FILENO, &rfds);
390 FD_SET(fd, &rfds);
391
392 retval = select(fd + 1, &rfds, NULL, NULL, NULL);
393 if (retval == -1 && errno == EINTR)
394 continue;
395 if (retval < 0) {
396 perror("select()");
397 return 4;
398 }
399
400 if (FD_ISSET(fd, &rfds)) {
401 cmd_len = read(fd, buf, BUF_LEN - 1);
402 printf("recv report:");
403 for (i = 0; i < cmd_len; i++)
404 printf(" %02x", buf[i]);
405 printf("\n");
406 }
407
408 if (FD_ISSET(STDIN_FILENO, &rfds)) {
409 memset(report, 0x0, sizeof(report));
410 cmd_len = read(STDIN_FILENO, buf, BUF_LEN - 1);
411
412 if (cmd_len == 0)
413 break;
414
415 buf[cmd_len - 1] = '\0';
416 hold = 0;
417
418 memset(report, 0x0, sizeof(report));
419 if (argv[2][0] == 'k')
420 to_send = keyboard_fill_report(report, buf, &hold);
421 else if (argv[2][0] == 'm')
422 to_send = mouse_fill_report(report, buf, &hold);
423 else
424 to_send = joystick_fill_report(report, buf, &hold);
425
426 if (to_send == -1)
427 break;
428
429 if (write(fd, report, to_send) != to_send) {
430 perror(filename);
431 return 5;
432 }
433 if (!hold) {
434 memset(report, 0x0, sizeof(report));
435 if (write(fd, report, to_send) != to_send) {
436 perror(filename);
437 return 6;
438 }
439 }
440 }
441 }
442
443 close(fd);
444 return 0;
445}
diff --git a/Documentation/usb/power-management.txt b/Documentation/usb/power-management.txt
index 2790ad48cfc2..b29d8e56cf28 100644
--- a/Documentation/usb/power-management.txt
+++ b/Documentation/usb/power-management.txt
@@ -107,7 +107,9 @@ allowed to issue dynamic suspends.
107The user interface for controlling dynamic PM is located in the power/ 107The user interface for controlling dynamic PM is located in the power/
108subdirectory of each USB device's sysfs directory, that is, in 108subdirectory of each USB device's sysfs directory, that is, in
109/sys/bus/usb/devices/.../power/ where "..." is the device's ID. The 109/sys/bus/usb/devices/.../power/ where "..." is the device's ID. The
110relevant attribute files are: wakeup, level, and autosuspend. 110relevant attribute files are: wakeup, control, and autosuspend.
111(There may also be a file named "level"; this file was deprecated
112as of the 2.6.35 kernel and replaced by the "control" file.)
111 113
112 power/wakeup 114 power/wakeup
113 115
@@ -120,7 +122,7 @@ relevant attribute files are: wakeup, level, and autosuspend.
120 while the device is suspended, the change won't take 122 while the device is suspended, the change won't take
121 effect until the following suspend.) 123 effect until the following suspend.)
122 124
123 power/level 125 power/control
124 126
125 This file contains one of two words: "on" or "auto". 127 This file contains one of two words: "on" or "auto".
126 You can write those words to the file to change the 128 You can write those words to the file to change the
@@ -148,14 +150,15 @@ relevant attribute files are: wakeup, level, and autosuspend.
148 never to autosuspend. You can write a number to the 150 never to autosuspend. You can write a number to the
149 file to change the autosuspend idle-delay time. 151 file to change the autosuspend idle-delay time.
150 152
151Writing "-1" to power/autosuspend and writing "on" to power/level do 153Writing "-1" to power/autosuspend and writing "on" to power/control do
152essentially the same thing -- they both prevent the device from being 154essentially the same thing -- they both prevent the device from being
153autosuspended. Yes, this is a redundancy in the API. 155autosuspended. Yes, this is a redundancy in the API.
154 156
155(In 2.6.21 writing "0" to power/autosuspend would prevent the device 157(In 2.6.21 writing "0" to power/autosuspend would prevent the device
156from being autosuspended; the behavior was changed in 2.6.22. The 158from being autosuspended; the behavior was changed in 2.6.22. The
157power/autosuspend attribute did not exist prior to 2.6.21, and the 159power/autosuspend attribute did not exist prior to 2.6.21, and the
158power/level attribute did not exist prior to 2.6.22.) 160power/level attribute did not exist prior to 2.6.22. power/control
161was added in 2.6.34.)
159 162
160 163
161 Changing the default idle-delay time 164 Changing the default idle-delay time
@@ -212,7 +215,7 @@ among printers and scanners, but plenty of other types of device have
212the same deficiency. 215the same deficiency.
213 216
214For this reason, by default the kernel disables autosuspend (the 217For this reason, by default the kernel disables autosuspend (the
215power/level attribute is initialized to "on") for all devices other 218power/control attribute is initialized to "on") for all devices other
216than hubs. Hubs, at least, appear to be reasonably well-behaved in 219than hubs. Hubs, at least, appear to be reasonably well-behaved in
217this regard. 220this regard.
218 221
@@ -373,7 +376,7 @@ usb_autopm_put_interface() in its close or release routine. But other
373patterns are possible. 376patterns are possible.
374 377
375The autosuspend attempts mentioned above will often fail for one 378The autosuspend attempts mentioned above will often fail for one
376reason or another. For example, the power/level attribute might be 379reason or another. For example, the power/control attribute might be
377set to "on", or another interface in the same device might not be 380set to "on", or another interface in the same device might not be
378idle. This is perfectly normal. If the reason for failure was that 381idle. This is perfectly normal. If the reason for failure was that
379the device hasn't been idle for long enough, a timer is scheduled to 382the device hasn't been idle for long enough, a timer is scheduled to
@@ -394,12 +397,12 @@ Drivers can enable autosuspend for their devices by calling
394 397
395in their probe() routine, if they know that the device is capable of 398in their probe() routine, if they know that the device is capable of
396suspending and resuming correctly. This is exactly equivalent to 399suspending and resuming correctly. This is exactly equivalent to
397writing "auto" to the device's power/level attribute. Likewise, 400writing "auto" to the device's power/control attribute. Likewise,
398drivers can disable autosuspend by calling 401drivers can disable autosuspend by calling
399 402
400 usb_disable_autosuspend(struct usb_device *udev); 403 usb_disable_autosuspend(struct usb_device *udev);
401 404
402This is exactly the same as writing "on" to the power/level attribute. 405This is exactly the same as writing "on" to the power/control attribute.
403 406
404Sometimes a driver needs to make sure that remote wakeup is enabled 407Sometimes a driver needs to make sure that remote wakeup is enabled
405during autosuspend. For example, there's not much point 408during autosuspend. For example, there's not much point
diff --git a/Documentation/usb/usb-serial.txt b/Documentation/usb/usb-serial.txt
index ff2c1ff57ba2..f4d214510259 100644
--- a/Documentation/usb/usb-serial.txt
+++ b/Documentation/usb/usb-serial.txt
@@ -194,6 +194,10 @@ FTDI Single Port Serial Driver
194 194
195 This is a single port DB-25 serial adapter. 195 This is a single port DB-25 serial adapter.
196 196
197 Devices supported include:
198 -TripNav TN-200 USB GPS
199 -Navis Engineering Bureau CH-4711 USB GPS
200
197 For any questions or problems with this driver, please contact Bill Ryder. 201 For any questions or problems with this driver, please contact Bill Ryder.
198 202
199 203
@@ -216,7 +220,7 @@ Cypress M8 CY4601 Family Serial Driver
216 220
217 Devices supported: 221 Devices supported:
218 222
219 -DeLorme's USB Earthmate (SiRF Star II lp arch) 223 -DeLorme's USB Earthmate GPS (SiRF Star II lp arch)
220 -Cypress HID->COM RS232 adapter 224 -Cypress HID->COM RS232 adapter
221 225
222 Note: Cypress Semiconductor claims no affiliation with the 226 Note: Cypress Semiconductor claims no affiliation with the
@@ -392,9 +396,10 @@ REINER SCT cyberJack pinpad/e-com USB chipcard reader
392Prolific PL2303 Driver 396Prolific PL2303 Driver
393 397
394 This driver supports any device that has the PL2303 chip from Prolific 398 This driver supports any device that has the PL2303 chip from Prolific
395 in it. This includes a number of single port USB to serial 399 in it. This includes a number of single port USB to serial converters,
396 converters and USB GPS devices. Devices from Aten (the UC-232) and 400 more than 70% of USB GPS devices (in 2010), and some USB UPSes. Devices
397 IO-Data work with this driver, as does the DCU-11 mobile-phone cable. 401 from Aten (the UC-232) and IO-Data work with this driver, as does
402 the DCU-11 mobile-phone cable.
398 403
399 For any questions or problems with this driver, please contact Greg 404 For any questions or problems with this driver, please contact Greg
400 Kroah-Hartman at greg@kroah.com 405 Kroah-Hartman at greg@kroah.com
@@ -435,6 +440,22 @@ Winchiphead CH341 Driver
435 For any questions or problems with this driver, please contact 440 For any questions or problems with this driver, please contact
436 frank@kingswood-consulting.co.uk. 441 frank@kingswood-consulting.co.uk.
437 442
443Moschip MCS7720, MCS7715 driver
444
445 These chips are present in devices sold by various manufacturers, such as Syba
446 and Cables Unlimited. There may be others. The 7720 provides two serial
447 ports, and the 7715 provides one serial and one standard PC parallel port.
448 Support for the 7715's parallel port is enabled by a separate option, which
449 will not appear unless parallel port support is first enabled at the top-level
450 of the Device Drivers config menu. Currently only compatibility mode is
451 supported on the parallel port (no ECP/EPP).
452
453 TODO:
454 - Implement ECP/EPP modes for the parallel port.
455 - Baud rates higher than 115200 are currently broken.
456 - Devices with a single serial port based on the Moschip MCS7703 may work
457 with this driver with a simple addition to the usb_device_id table. I
458 don't have one of these devices, so I can't say for sure.
438 459
439Generic Serial driver 460Generic Serial driver
440 461