From 71adf118946957839a13aa4d1094183e05c6c094 Mon Sep 17 00:00:00 2001 From: Fabien Chouteau Date: Thu, 8 Apr 2010 09:31:15 +0200 Subject: USB: gadget: add HID gadget driver g_hid is a USB gadget driver implementing the Human Interface Device class specification. The driver handles basic HID protocol handling in the kernel, and allows userspace to read/write HID reports trough /dev/hidgX character devices. Signed-off-by: Fabien Chouteau Signed-off-by: Peter Korsgaard Signed-off-by: Greg Kroah-Hartman --- Documentation/usb/gadget_hid.txt | 445 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 445 insertions(+) create mode 100644 Documentation/usb/gadget_hid.txt (limited to 'Documentation/usb') 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 @@ + + Linux USB HID gadget driver + +Introduction + + The HID Gadget driver provides emulation of USB Human Interface + Devices (HID). The basic HID handling is done in the kernel, + and HID reports can be sent/received through I/O on the + /dev/hidgX character devices. + + For more details about HID, see the developer page on + http://www.usb.org/developers/hidpage/ + +Configuration + + g_hid is a platform driver, so to use it you need to add + struct platform_device(s) to your platform code defining the + HID function descriptors you want to use - E.G. something + like: + +#include +#include + +/* hid descriptor for a keyboard */ +static struct hidg_func_descriptor my_hid_data = { + .subclass = 0, /* No subclass */ + .protocol = 1, /* Keyboard */ + .report_length = 8, + .report_desc_length = 63, + .report_desc = { + 0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */ + 0x09, 0x06, /* USAGE (Keyboard) */ + 0xa1, 0x01, /* COLLECTION (Application) */ + 0x05, 0x07, /* USAGE_PAGE (Keyboard) */ + 0x19, 0xe0, /* USAGE_MINIMUM (Keyboard LeftControl) */ + 0x29, 0xe7, /* USAGE_MAXIMUM (Keyboard Right GUI) */ + 0x15, 0x00, /* LOGICAL_MINIMUM (0) */ + 0x25, 0x01, /* LOGICAL_MAXIMUM (1) */ + 0x75, 0x01, /* REPORT_SIZE (1) */ + 0x95, 0x08, /* REPORT_COUNT (8) */ + 0x81, 0x02, /* INPUT (Data,Var,Abs) */ + 0x95, 0x01, /* REPORT_COUNT (1) */ + 0x75, 0x08, /* REPORT_SIZE (8) */ + 0x81, 0x03, /* INPUT (Cnst,Var,Abs) */ + 0x95, 0x05, /* REPORT_COUNT (5) */ + 0x75, 0x01, /* REPORT_SIZE (1) */ + 0x05, 0x08, /* USAGE_PAGE (LEDs) */ + 0x19, 0x01, /* USAGE_MINIMUM (Num Lock) */ + 0x29, 0x05, /* USAGE_MAXIMUM (Kana) */ + 0x91, 0x02, /* OUTPUT (Data,Var,Abs) */ + 0x95, 0x01, /* REPORT_COUNT (1) */ + 0x75, 0x03, /* REPORT_SIZE (3) */ + 0x91, 0x03, /* OUTPUT (Cnst,Var,Abs) */ + 0x95, 0x06, /* REPORT_COUNT (6) */ + 0x75, 0x08, /* REPORT_SIZE (8) */ + 0x15, 0x00, /* LOGICAL_MINIMUM (0) */ + 0x25, 0x65, /* LOGICAL_MAXIMUM (101) */ + 0x05, 0x07, /* USAGE_PAGE (Keyboard) */ + 0x19, 0x00, /* USAGE_MINIMUM (Reserved) */ + 0x29, 0x65, /* USAGE_MAXIMUM (Keyboard Application) */ + 0x81, 0x00, /* INPUT (Data,Ary,Abs) */ + 0xc0 /* END_COLLECTION */ + } +}; + +static struct platform_device my_hid = { + .name = "hidg", + .id = 0, + .num_resources = 0, + .resource = 0, + .dev.platform_data = &my_hid_data, +}; + + You can add as many HID functions as you want, only limited by + the amount of interrupt endpoints your gadget driver supports. + +Send and receive HID reports + + HID reports can be sent/received using read/write on the + /dev/hidgX character devices. See below for an example program + to do this. + + hid_gadget_test is a small interactive program to test the HID + gadget driver. To use, point it at a hidg device and set the + device type (keyboard / mouse / joystick) - E.G.: + + # hid_gadget_test /dev/hidg0 keyboard + + You are now in the prompt of hid_gadget_test. You can type any + combination of options and values. Available options and + values are listed at program start. In keyboard mode you can + send up to six values. + + For example type: g i s t r --left-shift + + Hit return and the corresponding report will be sent by the + HID gadget. + + Another interesting example is the caps lock test. Type + -–caps-lock and hit return. A report is then sent by the + gadget and you should receive the host answer, corresponding + to the caps lock LED status. + + --caps-lock + recv report:2 + + With this command: + + # hid_gadget_test /dev/hidg1 mouse + + You can test the mouse emulation. Values are two signed numbers. + + +Sample code + +/* hid_gadget_test */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define BUF_LEN 512 + +struct options { + const char *opt; + unsigned char val; +}; + +static struct options kmod[] = { + {.opt = "--left-ctrl", .val = 0x01}, + {.opt = "--right-ctrl", .val = 0x10}, + {.opt = "--left-shift", .val = 0x02}, + {.opt = "--right-shift", .val = 0x20}, + {.opt = "--left-alt", .val = 0x04}, + {.opt = "--right-alt", .val = 0x40}, + {.opt = "--left-meta", .val = 0x08}, + {.opt = "--right-meta", .val = 0x80}, + {.opt = NULL} +}; + +static struct options kval[] = { + {.opt = "--return", .val = 0x28}, + {.opt = "--esc", .val = 0x29}, + {.opt = "--bckspc", .val = 0x2a}, + {.opt = "--tab", .val = 0x2b}, + {.opt = "--spacebar", .val = 0x2c}, + {.opt = "--caps-lock", .val = 0x39}, + {.opt = "--f1", .val = 0x3a}, + {.opt = "--f2", .val = 0x3b}, + {.opt = "--f3", .val = 0x3c}, + {.opt = "--f4", .val = 0x3d}, + {.opt = "--f5", .val = 0x3e}, + {.opt = "--f6", .val = 0x3f}, + {.opt = "--f7", .val = 0x40}, + {.opt = "--f8", .val = 0x41}, + {.opt = "--f9", .val = 0x42}, + {.opt = "--f10", .val = 0x43}, + {.opt = "--f11", .val = 0x44}, + {.opt = "--f12", .val = 0x45}, + {.opt = "--insert", .val = 0x49}, + {.opt = "--home", .val = 0x4a}, + {.opt = "--pageup", .val = 0x4b}, + {.opt = "--del", .val = 0x4c}, + {.opt = "--end", .val = 0x4d}, + {.opt = "--pagedown", .val = 0x4e}, + {.opt = "--right", .val = 0x4f}, + {.opt = "--left", .val = 0x50}, + {.opt = "--down", .val = 0x51}, + {.opt = "--kp-enter", .val = 0x58}, + {.opt = "--up", .val = 0x52}, + {.opt = "--num-lock", .val = 0x53}, + {.opt = NULL} +}; + +int keyboard_fill_report(char report[8], char buf[BUF_LEN], int *hold) +{ + char *tok = strtok(buf, " "); + int key = 0; + int i = 0; + + for (; tok != NULL; tok = strtok(NULL, " ")) { + + if (strcmp(tok, "--quit") == 0) + return -1; + + if (strcmp(tok, "--hold") == 0) { + *hold = 1; + continue; + } + + if (key < 6) { + for (i = 0; kval[i].opt != NULL; i++) + if (strcmp(tok, kval[i].opt) == 0) { + report[2 + key++] = kval[i].val; + break; + } + if (kval[i].opt != NULL) + continue; + } + + if (key < 6) + if (islower(tok[0])) { + report[2 + key++] = (tok[0] - ('a' - 0x04)); + continue; + } + + for (i = 0; kmod[i].opt != NULL; i++) + if (strcmp(tok, kmod[i].opt) == 0) { + report[0] = report[0] | kmod[i].val; + break; + } + if (kmod[i].opt != NULL) + continue; + + if (key < 6) + fprintf(stderr, "unknown option: %s\n", tok); + } + return 8; +} + +static struct options mmod[] = { + {.opt = "--b1", .val = 0x01}, + {.opt = "--b2", .val = 0x02}, + {.opt = "--b3", .val = 0x04}, + {.opt = NULL} +}; + +int mouse_fill_report(char report[8], char buf[BUF_LEN], int *hold) +{ + char *tok = strtok(buf, " "); + int mvt = 0; + int i = 0; + for (; tok != NULL; tok = strtok(NULL, " ")) { + + if (strcmp(tok, "--quit") == 0) + return -1; + + if (strcmp(tok, "--hold") == 0) { + *hold = 1; + continue; + } + + for (i = 0; mmod[i].opt != NULL; i++) + if (strcmp(tok, mmod[i].opt) == 0) { + report[0] = report[0] | mmod[i].val; + break; + } + if (mmod[i].opt != NULL) + continue; + + if (!(tok[0] == '-' && tok[1] == '-') && mvt < 2) { + errno = 0; + report[1 + mvt++] = (char)strtol(tok, NULL, 0); + if (errno != 0) { + fprintf(stderr, "Bad value:'%s'\n", tok); + report[1 + mvt--] = 0; + } + continue; + } + + fprintf(stderr, "unknown option: %s\n", tok); + } + return 3; +} + +static struct options jmod[] = { + {.opt = "--b1", .val = 0x10}, + {.opt = "--b2", .val = 0x20}, + {.opt = "--b3", .val = 0x40}, + {.opt = "--b4", .val = 0x80}, + {.opt = "--hat1", .val = 0x00}, + {.opt = "--hat2", .val = 0x01}, + {.opt = "--hat3", .val = 0x02}, + {.opt = "--hat4", .val = 0x03}, + {.opt = "--hatneutral", .val = 0x04}, + {.opt = NULL} +}; + +int joystick_fill_report(char report[8], char buf[BUF_LEN], int *hold) +{ + char *tok = strtok(buf, " "); + int mvt = 0; + int i = 0; + + *hold = 1; + + /* set default hat position: neutral */ + report[3] = 0x04; + + for (; tok != NULL; tok = strtok(NULL, " ")) { + + if (strcmp(tok, "--quit") == 0) + return -1; + + for (i = 0; jmod[i].opt != NULL; i++) + if (strcmp(tok, jmod[i].opt) == 0) { + report[3] = (report[3] & 0xF0) | jmod[i].val; + break; + } + if (jmod[i].opt != NULL) + continue; + + if (!(tok[0] == '-' && tok[1] == '-') && mvt < 3) { + errno = 0; + report[mvt++] = (char)strtol(tok, NULL, 0); + if (errno != 0) { + fprintf(stderr, "Bad value:'%s'\n", tok); + report[mvt--] = 0; + } + continue; + } + + fprintf(stderr, "unknown option: %s\n", tok); + } + return 4; +} + +void print_options(char c) +{ + int i = 0; + + if (c == 'k') { + printf(" keyboard options:\n" + " --hold\n"); + for (i = 0; kmod[i].opt != NULL; i++) + printf("\t\t%s\n", kmod[i].opt); + printf("\n keyboard values:\n" + " [a-z] or\n"); + for (i = 0; kval[i].opt != NULL; i++) + printf("\t\t%-8s%s", kval[i].opt, i % 2 ? "\n" : ""); + printf("\n"); + } else if (c == 'm') { + printf(" mouse options:\n" + " --hold\n"); + for (i = 0; mmod[i].opt != NULL; i++) + printf("\t\t%s\n", mmod[i].opt); + printf("\n mouse values:\n" + " Two signed numbers\n" + "--quit to close\n"); + } else { + printf(" joystick options:\n"); + for (i = 0; jmod[i].opt != NULL; i++) + printf("\t\t%s\n", jmod[i].opt); + printf("\n joystick values:\n" + " three signed numbers\n" + "--quit to close\n"); + } +} + +int main(int argc, const char *argv[]) +{ + const char *filename = NULL; + int fd = 0; + char buf[BUF_LEN]; + int cmd_len; + char report[8]; + int to_send = 8; + int hold = 0; + fd_set rfds; + int retval, i; + + if (argc < 3) { + fprintf(stderr, "Usage: %s devname mouse|keyboard|joystick\n", + argv[0]); + return 1; + } + + if (argv[2][0] != 'k' && argv[2][0] != 'm' && argv[2][0] != 'j') + return 2; + + filename = argv[1]; + + if ((fd = open(filename, O_RDWR, 0666)) == -1) { + perror(filename); + return 3; + } + + print_options(argv[2][0]); + + while (42) { + + FD_ZERO(&rfds); + FD_SET(STDIN_FILENO, &rfds); + FD_SET(fd, &rfds); + + retval = select(fd + 1, &rfds, NULL, NULL, NULL); + if (retval == -1 && errno == EINTR) + continue; + if (retval < 0) { + perror("select()"); + return 4; + } + + if (FD_ISSET(fd, &rfds)) { + cmd_len = read(fd, buf, BUF_LEN - 1); + printf("recv report:"); + for (i = 0; i < cmd_len; i++) + printf(" %02x", buf[i]); + printf("\n"); + } + + if (FD_ISSET(STDIN_FILENO, &rfds)) { + memset(report, 0x0, sizeof(report)); + cmd_len = read(STDIN_FILENO, buf, BUF_LEN - 1); + + if (cmd_len == 0) + break; + + buf[cmd_len - 1] = '\0'; + hold = 0; + + memset(report, 0x0, sizeof(report)); + if (argv[2][0] == 'k') + to_send = keyboard_fill_report(report, buf, &hold); + else if (argv[2][0] == 'm') + to_send = mouse_fill_report(report, buf, &hold); + else + to_send = joystick_fill_report(report, buf, &hold); + + if (to_send == -1) + break; + + if (write(fd, report, to_send) != to_send) { + perror(filename); + return 5; + } + if (!hold) { + memset(report, 0x0, sizeof(report)); + if (write(fd, report, to_send) != to_send) { + perror(filename); + return 6; + } + } + } + } + + close(fd); + return 0; +} -- cgit v1.2.3 From a90309860b0935805d49e75499fb8dc59fea8e94 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Fri, 2 Apr 2010 13:22:16 -0400 Subject: USB: deprecate the power/level sysfs attribute This patch (as1367) deprecates USB's power/level sysfs attribute in favor of the power/control attribute provided by the runtime PM core. The two attributes do the same thing. It would be nice to replace power/level with a symlink to power/control, but at the moment sysfs doesn't offer any way to do so. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- Documentation/usb/power-management.txt | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) (limited to 'Documentation/usb') 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. The user interface for controlling dynamic PM is located in the power/ subdirectory of each USB device's sysfs directory, that is, in /sys/bus/usb/devices/.../power/ where "..." is the device's ID. The -relevant attribute files are: wakeup, level, and autosuspend. +relevant attribute files are: wakeup, control, and autosuspend. +(There may also be a file named "level"; this file was deprecated +as of the 2.6.35 kernel and replaced by the "control" file.) power/wakeup @@ -120,7 +122,7 @@ relevant attribute files are: wakeup, level, and autosuspend. while the device is suspended, the change won't take effect until the following suspend.) - power/level + power/control This file contains one of two words: "on" or "auto". You can write those words to the file to change the @@ -148,14 +150,15 @@ relevant attribute files are: wakeup, level, and autosuspend. never to autosuspend. You can write a number to the file to change the autosuspend idle-delay time. -Writing "-1" to power/autosuspend and writing "on" to power/level do +Writing "-1" to power/autosuspend and writing "on" to power/control do essentially the same thing -- they both prevent the device from being autosuspended. Yes, this is a redundancy in the API. (In 2.6.21 writing "0" to power/autosuspend would prevent the device from being autosuspended; the behavior was changed in 2.6.22. The power/autosuspend attribute did not exist prior to 2.6.21, and the -power/level attribute did not exist prior to 2.6.22.) +power/level attribute did not exist prior to 2.6.22. power/control +was added in 2.6.34.) Changing the default idle-delay time @@ -212,7 +215,7 @@ among printers and scanners, but plenty of other types of device have the same deficiency. For this reason, by default the kernel disables autosuspend (the -power/level attribute is initialized to "on") for all devices other +power/control attribute is initialized to "on") for all devices other than hubs. Hubs, at least, appear to be reasonably well-behaved in this regard. @@ -373,7 +376,7 @@ usb_autopm_put_interface() in its close or release routine. But other patterns are possible. The autosuspend attempts mentioned above will often fail for one -reason or another. For example, the power/level attribute might be +reason or another. For example, the power/control attribute might be set to "on", or another interface in the same device might not be idle. This is perfectly normal. If the reason for failure was that the 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 in their probe() routine, if they know that the device is capable of suspending and resuming correctly. This is exactly equivalent to -writing "auto" to the device's power/level attribute. Likewise, +writing "auto" to the device's power/control attribute. Likewise, drivers can disable autosuspend by calling usb_disable_autosuspend(struct usb_device *udev); -This is exactly the same as writing "on" to the power/level attribute. +This is exactly the same as writing "on" to the power/control attribute. Sometimes a driver needs to make sure that remote wakeup is enabled during autosuspend. For example, there's not much point -- cgit v1.2.3 From eab1cafc3b524b714b0567ab98fc75ace09db98c Mon Sep 17 00:00:00 2001 From: Sarah Sharp Date: Mon, 5 Apr 2010 10:55:58 -0700 Subject: USB: Support for allocating USB 3.0 streams. Bulk endpoint streams were added in the USB 3.0 specification. Streams allow a device driver to overload a bulk endpoint so that multiple transfers can be queued at once. The device then decides which transfer it wants to work on first, and can queue part of a transfer before it switches to a new stream. All this switching is invisible to the device driver, which just gets a completion for the URB. Drivers that use streams must be able to handle URBs completing in a different order than they were submitted to the endpoint. This requires adding new API to set up xHCI data structures to support multiple queues ("stream rings") per endpoint. Drivers will allocate a number of stream IDs before enqueueing URBs to the bulk endpoints of the device, and free the stream IDs in their disconnect function. See Documentation/usb/bulk-streams.txt for details. The new mass storage device class, USB Attached SCSI Protocol (UASP), uses these streams API. Signed-off-by: Sarah Sharp Signed-off-by: Greg Kroah-Hartman --- Documentation/usb/bulk-streams.txt | 78 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 Documentation/usb/bulk-streams.txt (limited to 'Documentation/usb') 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 @@ +Background +========== + +Bulk endpoint streams were added in the USB 3.0 specification. Streams allow a +device driver to overload a bulk endpoint so that multiple transfers can be +queued at once. + +Streams are defined in sections 4.4.6.4 and 8.12.1.4 of the Universal Serial Bus +3.0 specification at http://www.usb.org/developers/docs/ The USB Attached SCSI +Protocol, which uses streams to queue multiple SCSI commands, can be found on +the T10 website (http://t10.org/). + + +Device-side implications +======================== + +Once a buffer has been queued to a stream ring, the device is notified (through +an out-of-band mechanism on another endpoint) that data is ready for that stream +ID. The device then tells the host which "stream" it wants to start. The host +can also initiate a transfer on a stream without the device asking, but the +device can refuse that transfer. Devices can switch between streams at any +time. + + +Driver implications +=================== + +int usb_alloc_streams(struct usb_interface *interface, + struct usb_host_endpoint **eps, unsigned int num_eps, + unsigned int num_streams, gfp_t mem_flags); + +Device drivers will call this API to request that the host controller driver +allocate memory so the driver can use up to num_streams stream IDs. They must +pass an array of usb_host_endpoints that need to be setup with similar stream +IDs. This is to ensure that a UASP driver will be able to use the same stream +ID for the bulk IN and OUT endpoints used in a Bi-directional command sequence. + +The return value is an error condition (if one of the endpoints doesn't support +streams, or the xHCI driver ran out of memory), or the number of streams the +host controller allocated for this endpoint. The xHCI host controller hardware +declares how many stream IDs it can support, and each bulk endpoint on a +SuperSpeed device will say how many stream IDs it can handle. Therefore, +drivers should be able to deal with being allocated less stream IDs than they +requested. + +Do NOT call this function if you have URBs enqueued for any of the endpoints +passed in as arguments. Do not call this function to request less than two +streams. + +Drivers will only be allowed to call this API once for the same endpoint +without calling usb_free_streams(). This is a simplification for the xHCI host +controller driver, and may change in the future. + + +Picking new Stream IDs to use +============================ + +Stream ID 0 is reserved, and should not be used to communicate with devices. If +usb_alloc_streams() returns with a value of N, you may use streams 1 though N. +To queue an URB for a specific stream, set the urb->stream_id value. If the +endpoint does not support streams, an error will be returned. + +Note that new API to choose the next stream ID will have to be added if the xHCI +driver supports secondary stream IDs. + + +Clean up +======== + +If a driver wishes to stop using streams to communicate with the device, it +should call + +void usb_free_streams(struct usb_interface *interface, + struct usb_host_endpoint **eps, unsigned int num_eps, + gfp_t mem_flags); + +All stream IDs will be deallocated when the driver releases the interface, to +ensure that drivers that don't support streams will be able to use the endpoint. -- cgit v1.2.3 From 48679c6d772b1459a2945729e3a1256ac78fcabf Mon Sep 17 00:00:00 2001 From: Eric Raymond Date: Thu, 15 Apr 2010 01:35:50 -0400 Subject: USB: Short new 'graph for usb-serial.txt Documentation update Signed-off-by: Greg Kroah-Hartman --- Documentation/usb/usb-serial.txt | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) (limited to 'Documentation/usb') diff --git a/Documentation/usb/usb-serial.txt b/Documentation/usb/usb-serial.txt index ff2c1ff57ba2..540c91ccf86f 100644 --- a/Documentation/usb/usb-serial.txt +++ b/Documentation/usb/usb-serial.txt @@ -194,6 +194,10 @@ FTDI Single Port Serial Driver This is a single port DB-25 serial adapter. + Devices supported include: + -TripNav TN-200 USB GPS + -Navis Engineering Bureau CH-4711 USB GPS + For any questions or problems with this driver, please contact Bill Ryder. @@ -216,7 +220,7 @@ Cypress M8 CY4601 Family Serial Driver Devices supported: - -DeLorme's USB Earthmate (SiRF Star II lp arch) + -DeLorme's USB Earthmate GPS (SiRF Star II lp arch) -Cypress HID->COM RS232 adapter Note: Cypress Semiconductor claims no affiliation with the @@ -392,9 +396,10 @@ REINER SCT cyberJack pinpad/e-com USB chipcard reader Prolific PL2303 Driver This driver supports any device that has the PL2303 chip from Prolific - in it. This includes a number of single port USB to serial - converters and USB GPS devices. Devices from Aten (the UC-232) and - IO-Data work with this driver, as does the DCU-11 mobile-phone cable. + in it. This includes a number of single port USB to serial converters, + more than 70% of USB GPS devices (in 2010), and some USB UPSes. Devices + from Aten (the UC-232) and IO-Data work with this driver, as does + the DCU-11 mobile-phone cable. For any questions or problems with this driver, please contact Greg Kroah-Hartman at greg@kroah.com -- cgit v1.2.3 From 997ea58eb92f9970b8af7aae48800d0ef43b9423 Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Mon, 12 Apr 2010 13:17:25 +0200 Subject: USB: rename usb_buffer_alloc() and usb_buffer_free() users For more clearance what the functions actually do, usb_buffer_alloc() is renamed to usb_alloc_coherent() usb_buffer_free() is renamed to usb_free_coherent() They should only be used in code which really needs DMA coherency. All call sites have been changed accordingly, except for staging drivers. Signed-off-by: Daniel Mack Cc: Alan Stern Cc: Pedro Ribeiro Signed-off-by: Greg Kroah-Hartman --- Documentation/usb/dma.txt | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'Documentation/usb') diff --git a/Documentation/usb/dma.txt b/Documentation/usb/dma.txt index cfdcd16e3abf..a37e59cf2786 100644 --- a/Documentation/usb/dma.txt +++ b/Documentation/usb/dma.txt @@ -43,10 +43,10 @@ and effects like cache-trashing can impose subtle penalties. kind of addresses to store in urb->transfer_buffer and urb->transfer_dma. You'd also set URB_NO_TRANSFER_DMA_MAP in urb->transfer_flags: - void *usb_buffer_alloc (struct usb_device *dev, size_t size, + void *usb_alloc_coherent (struct usb_device *dev, size_t size, int mem_flags, dma_addr_t *dma); - void usb_buffer_free (struct usb_device *dev, size_t size, + void usb_free_coherent (struct usb_device *dev, size_t size, void *addr, dma_addr_t dma); Most drivers should *NOT* be using these primitives; they don't need -- cgit v1.2.3 From b69578df7e98659b7d94c905971a6d1025b431ad Mon Sep 17 00:00:00 2001 From: Mike Dunn Date: Thu, 15 Apr 2010 17:01:33 -0400 Subject: USB: usbserial: mos7720: add support for parallel port on moschip 7715 Add support for the parallel port on the moschip MCS7715 device. The port registers itself with the parport subsystem as a low-level driver. A separate entry to the kernel configuration is added beneath that for the mos7720, to avoid the need to link with the parport subsystem code for users who don't have or don't want the parallel port. Only compatibility mode is currently supported (no ECP/EPP). Tested with both moschip devices (7720 and 7715) on UP and SMP hosts, including regression testing of serial port, concurrent operation of serial and parallel ports, and various connect / disconnect scenarios. Signed-off-by: Mike Dunn Signed-off-by: Greg Kroah-Hartman --- Documentation/usb/usb-serial.txt | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'Documentation/usb') diff --git a/Documentation/usb/usb-serial.txt b/Documentation/usb/usb-serial.txt index 540c91ccf86f..f4d214510259 100644 --- a/Documentation/usb/usb-serial.txt +++ b/Documentation/usb/usb-serial.txt @@ -440,6 +440,22 @@ Winchiphead CH341 Driver For any questions or problems with this driver, please contact frank@kingswood-consulting.co.uk. +Moschip MCS7720, MCS7715 driver + + These chips are present in devices sold by various manufacturers, such as Syba + and Cables Unlimited. There may be others. The 7720 provides two serial + ports, and the 7715 provides one serial and one standard PC parallel port. + Support for the 7715's parallel port is enabled by a separate option, which + will not appear unless parallel port support is first enabled at the top-level + of the Device Drivers config menu. Currently only compatibility mode is + supported on the parallel port (no ECP/EPP). + + TODO: + - Implement ECP/EPP modes for the parallel port. + - Baud rates higher than 115200 are currently broken. + - Devices with a single serial port based on the Moschip MCS7703 may work + with this driver with a simple addition to the usb_device_id table. I + don't have one of these devices, so I can't say for sure. Generic Serial driver -- cgit v1.2.3 From 85bcb5ee889e0ebb9154718939e049de265fcdfb Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Fri, 30 Apr 2010 16:35:37 -0400 Subject: USB: remove URB_NO_SETUP_DMA_MAP Now that URB_NO_SETUP_DMA_MAP is no longer in use, this patch (as1376) removes all references to it. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- Documentation/usb/dma.txt | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-) (limited to 'Documentation/usb') diff --git a/Documentation/usb/dma.txt b/Documentation/usb/dma.txt index a37e59cf2786..84ef865237db 100644 --- a/Documentation/usb/dma.txt +++ b/Documentation/usb/dma.txt @@ -16,11 +16,11 @@ OR: they can now be DMA-aware. manage dma mappings for existing dma-ready buffers (see below). - URBs have an additional "transfer_dma" field, as well as a transfer_flags - bit saying if it's valid. (Control requests also have "setup_dma" and a - corresponding transfer_flags bit.) + bit saying if it's valid. (Control requests also have "setup_dma", but + drivers must not use it.) -- "usbcore" will map those DMA addresses, if a DMA-aware driver didn't do - it first and set URB_NO_TRANSFER_DMA_MAP or URB_NO_SETUP_DMA_MAP. HCDs +- "usbcore" will map this DMA address, if a DMA-aware driver didn't do + it first and set URB_NO_TRANSFER_DMA_MAP. HCDs don't manage dma mappings for URBs. - There's a new "generic DMA API", parts of which are usable by USB device @@ -53,12 +53,6 @@ and effects like cache-trashing can impose subtle penalties. to use this type of memory ("dma-coherent"), and memory returned from kmalloc() will work just fine. - For control transfers you can use the buffer primitives or not for each - of the transfer buffer and setup buffer independently. Set the flag bits - URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP to indicate which - buffers you have prepared. For non-control transfers URB_NO_SETUP_DMA_MAP - is ignored. - The memory buffer returned is "dma-coherent"; sometimes you might need to force a consistent memory access ordering by using memory barriers. It's 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?") void usb_buffer_unmap (struct urb *urb); The calls manage urb->transfer_dma for you, and set URB_NO_TRANSFER_DMA_MAP - so that usbcore won't map or unmap the buffer. The same goes for - urb->setup_dma and URB_NO_SETUP_DMA_MAP for control requests. + so that usbcore won't map or unmap the buffer. They cannot be used for + setup_packet buffers in control requests. Note that several of those interfaces are currently commented out, since they don't have current users. See the source code. Other than the dmasync -- cgit v1.2.3