hid-core.c
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上传日期:2013-04-10
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- /*
- * $Id: hid-core.c,v 1.8 2001/05/23 12:02:18 vojtech Exp $
- *
- * Copyright (c) 1999 Andreas Gal
- * Copyright (c) 2000-2001 Vojtech Pavlik
- *
- * USB HID support for Linux
- *
- * Sponsored by SuSE
- */
- /*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Should you need to contact me, the author, you can do so either by
- * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
- * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
- */
- #include <linux/module.h>
- #include <linux/slab.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/list.h>
- #include <linux/mm.h>
- #include <linux/smp_lock.h>
- #include <linux/spinlock.h>
- #include <asm/unaligned.h>
- #include <linux/input.h>
- #undef DEBUG
- #undef DEBUG_DATA
- #include <linux/usb.h>
- #include "hid.h"
- #include <linux/hiddev.h>
- /*
- * Version Information
- */
- #define DRIVER_VERSION "v1.8.1"
- #define DRIVER_AUTHOR "Andreas Gal, Vojtech Pavlik <vojtech@suse.cz>"
- #define DRIVER_DESC "USB HID support drivers"
- static char *hid_types[] = {"Device", "Pointer", "Mouse", "Device", "Joystick",
- "Gamepad", "Keyboard", "Keypad", "Multi-Axis Controller"};
- /*
- * Register a new report for a device.
- */
- static struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id)
- {
- struct hid_report_enum *report_enum = device->report_enum + type;
- struct hid_report *report;
- if (report_enum->report_id_hash[id])
- return report_enum->report_id_hash[id];
- if (!(report = kmalloc(sizeof(struct hid_report), GFP_KERNEL)))
- return NULL;
- memset(report, 0, sizeof(struct hid_report));
- if (id != 0) report_enum->numbered = 1;
- report->id = id;
- report->type = type;
- report->size = 0;
- report->device = device;
- report_enum->report_id_hash[id] = report;
- list_add_tail(&report->list, &report_enum->report_list);
- return report;
- }
- /*
- * Register a new field for this report.
- */
- static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages, unsigned values)
- {
- struct hid_field *field;
- if (report->maxfield == HID_MAX_FIELDS) {
- dbg("too many fields in report");
- return NULL;
- }
- if (!(field = kmalloc(sizeof(struct hid_field) + usages * sizeof(struct hid_usage)
- + values * sizeof(unsigned), GFP_KERNEL))) return NULL;
- memset(field, 0, sizeof(struct hid_field) + usages * sizeof(struct hid_usage)
- + values * sizeof(unsigned));
- report->field[report->maxfield++] = field;
- field->usage = (struct hid_usage *)(field + 1);
- field->value = (unsigned *)(field->usage + usages);
- field->report = report;
- return field;
- }
- /*
- * Open a collection. The type/usage is pushed on the stack.
- */
- static int open_collection(struct hid_parser *parser, unsigned type)
- {
- struct hid_collection *collection;
- unsigned usage;
- usage = parser->local.usage[0];
- if (type == HID_COLLECTION_APPLICATION
- && parser->device->maxapplication < HID_MAX_APPLICATIONS)
- parser->device->application[parser->device->maxapplication++] = usage;
- if (parser->collection_stack_ptr == HID_COLLECTION_STACK_SIZE) {
- dbg("collection stack overflow");
- return -1;
- }
- collection = parser->collection_stack + parser->collection_stack_ptr++;
- collection->type = type;
- collection->usage = usage;
- return 0;
- }
- /*
- * Close a collection.
- */
- static int close_collection(struct hid_parser *parser)
- {
- if (!parser->collection_stack_ptr) {
- dbg("collection stack underflow");
- return -1;
- }
- parser->collection_stack_ptr--;
- return 0;
- }
- /*
- * Climb up the stack, search for the specified collection type
- * and return the usage.
- */
- static unsigned hid_lookup_collection(struct hid_parser *parser, unsigned type)
- {
- int n;
- for (n = parser->collection_stack_ptr - 1; n >= 0; n--)
- if (parser->collection_stack[n].type == type)
- return parser->collection_stack[n].usage;
- return 0; /* we know nothing about this usage type */
- }
- /*
- * Add a usage to the temporary parser table.
- */
- static int hid_add_usage(struct hid_parser *parser, unsigned usage)
- {
- if (parser->local.usage_index >= HID_MAX_USAGES) {
- dbg("usage index exceeded");
- return -1;
- }
- parser->local.usage[parser->local.usage_index++] = usage;
- return 0;
- }
- /*
- * Register a new field for this report.
- */
- static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsigned flags)
- {
- struct hid_report *report;
- struct hid_field *field;
- int usages;
- unsigned offset;
- int i;
- if (!(report = hid_register_report(parser->device, report_type, parser->global.report_id))) {
- dbg("hid_register_report failed");
- return -1;
- }
- if (parser->global.logical_maximum <= parser->global.logical_minimum) {
- dbg("logical range invalid %d %d", parser->global.logical_minimum, parser->global.logical_maximum);
- return -1;
- }
- usages = parser->local.usage_index;
- offset = report->size;
- report->size += parser->global.report_size * parser->global.report_count;
- if (usages == 0)
- return 0; /* ignore padding fields */
- if ((field = hid_register_field(report, usages, parser->global.report_count)) == NULL)
- return 0;
- field->physical = hid_lookup_collection(parser, HID_COLLECTION_PHYSICAL);
- field->logical = hid_lookup_collection(parser, HID_COLLECTION_LOGICAL);
- field->application = hid_lookup_collection(parser, HID_COLLECTION_APPLICATION);
- for (i = 0; i < usages; i++)
- field->usage[i].hid = parser->local.usage[i];
- field->maxusage = usages;
- field->flags = flags;
- field->report_offset = offset;
- field->report_type = report_type;
- field->report_size = parser->global.report_size;
- field->report_count = parser->global.report_count;
- field->logical_minimum = parser->global.logical_minimum;
- field->logical_maximum = parser->global.logical_maximum;
- field->physical_minimum = parser->global.physical_minimum;
- field->physical_maximum = parser->global.physical_maximum;
- field->unit_exponent = parser->global.unit_exponent;
- field->unit = parser->global.unit;
- return 0;
- }
- /*
- * Read data value from item.
- */
- static __inline__ __u32 item_udata(struct hid_item *item)
- {
- switch (item->size) {
- case 1: return item->data.u8;
- case 2: return item->data.u16;
- case 4: return item->data.u32;
- }
- return 0;
- }
- static __inline__ __s32 item_sdata(struct hid_item *item)
- {
- switch (item->size) {
- case 1: return item->data.s8;
- case 2: return item->data.s16;
- case 4: return item->data.s32;
- }
- return 0;
- }
- /*
- * Process a global item.
- */
- static int hid_parser_global(struct hid_parser *parser, struct hid_item *item)
- {
- switch (item->tag) {
- case HID_GLOBAL_ITEM_TAG_PUSH:
- if (parser->global_stack_ptr == HID_GLOBAL_STACK_SIZE) {
- dbg("global enviroment stack overflow");
- return -1;
- }
- memcpy(parser->global_stack + parser->global_stack_ptr++,
- &parser->global, sizeof(struct hid_global));
- return 0;
- case HID_GLOBAL_ITEM_TAG_POP:
- if (!parser->global_stack_ptr) {
- dbg("global enviroment stack underflow");
- return -1;
- }
- memcpy(&parser->global, parser->global_stack + --parser->global_stack_ptr,
- sizeof(struct hid_global));
- return 0;
- case HID_GLOBAL_ITEM_TAG_USAGE_PAGE:
- parser->global.usage_page = item_udata(item);
- return 0;
- case HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM:
- parser->global.logical_minimum = item_sdata(item);
- return 0;
- case HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM:
- if (parser->global.logical_minimum < 0)
- parser->global.logical_maximum = item_sdata(item);
- else
- parser->global.logical_maximum = item_udata(item);
- return 0;
- case HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM:
- parser->global.physical_minimum = item_sdata(item);
- return 0;
- case HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM:
- if (parser->global.physical_minimum < 0)
- parser->global.physical_maximum = item_sdata(item);
- else
- parser->global.physical_maximum = item_udata(item);
- return 0;
- case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT:
- parser->global.unit_exponent = item_udata(item);
- return 0;
- case HID_GLOBAL_ITEM_TAG_UNIT:
- parser->global.unit = item_udata(item);
- return 0;
- case HID_GLOBAL_ITEM_TAG_REPORT_SIZE:
- if ((parser->global.report_size = item_udata(item)) > 32) {
- dbg("invalid report_size %d", parser->global.report_size);
- return -1;
- }
- return 0;
- case HID_GLOBAL_ITEM_TAG_REPORT_COUNT:
- if ((parser->global.report_count = item_udata(item)) > HID_MAX_USAGES) {
- dbg("invalid report_count %d", parser->global.report_count);
- return -1;
- }
- return 0;
- case HID_GLOBAL_ITEM_TAG_REPORT_ID:
- if ((parser->global.report_id = item_udata(item)) == 0) {
- dbg("report_id 0 is invalid");
- return -1;
- }
- return 0;
- default:
- dbg("unknown global tag 0x%x", item->tag);
- return -1;
- }
- }
- /*
- * Process a local item.
- */
- static int hid_parser_local(struct hid_parser *parser, struct hid_item *item)
- {
- __u32 data;
- unsigned n;
- if (item->size == 0) {
- dbg("item data expected for local item");
- return -1;
- }
- data = item_udata(item);
- switch (item->tag) {
- case HID_LOCAL_ITEM_TAG_DELIMITER:
- if (data) {
- /*
- * We treat items before the first delimiter
- * as global to all usage sets (branch 0).
- * In the moment we process only these global
- * items and the first delimiter set.
- */
- if (parser->local.delimiter_depth != 0) {
- dbg("nested delimiters");
- return -1;
- }
- parser->local.delimiter_depth++;
- parser->local.delimiter_branch++;
- } else {
- if (parser->local.delimiter_depth < 1) {
- dbg("bogus close delimiter");
- return -1;
- }
- parser->local.delimiter_depth--;
- }
- return 1;
- case HID_LOCAL_ITEM_TAG_USAGE:
- if (parser->local.delimiter_branch > 1) {
- dbg("alternative usage ignored");
- return 0;
- }
- if (item->size <= 2)
- data = (parser->global.usage_page << 16) + data;
- return hid_add_usage(parser, data);
- case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM:
- if (parser->local.delimiter_branch > 1) {
- dbg("alternative usage ignored");
- return 0;
- }
- if (item->size <= 2)
- data = (parser->global.usage_page << 16) + data;
- parser->local.usage_minimum = data;
- return 0;
- case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM:
- if (parser->local.delimiter_branch > 1) {
- dbg("alternative usage ignored");
- return 0;
- }
- if (item->size <= 2)
- data = (parser->global.usage_page << 16) + data;
- for (n = parser->local.usage_minimum; n <= data; n++)
- if (hid_add_usage(parser, n)) {
- dbg("hid_add_usage failedn");
- return -1;
- }
- return 0;
- default:
- dbg("unknown local item tag 0x%x", item->tag);
- return 0;
- }
- return 0;
- }
- /*
- * Process a main item.
- */
- static int hid_parser_main(struct hid_parser *parser, struct hid_item *item)
- {
- __u32 data;
- int ret;
- data = item_udata(item);
- switch (item->tag) {
- case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION:
- ret = open_collection(parser, data & 3);
- break;
- case HID_MAIN_ITEM_TAG_END_COLLECTION:
- ret = close_collection(parser);
- break;
- case HID_MAIN_ITEM_TAG_INPUT:
- ret = hid_add_field(parser, HID_INPUT_REPORT, data);
- break;
- case HID_MAIN_ITEM_TAG_OUTPUT:
- ret = hid_add_field(parser, HID_OUTPUT_REPORT, data);
- break;
- case HID_MAIN_ITEM_TAG_FEATURE:
- ret = hid_add_field(parser, HID_FEATURE_REPORT, data);
- break;
- default:
- dbg("unknown main item tag 0x%x", item->tag);
- ret = 0;
- }
- memset(&parser->local, 0, sizeof(parser->local)); /* Reset the local parser environment */
- return ret;
- }
- /*
- * Process a reserved item.
- */
- static int hid_parser_reserved(struct hid_parser *parser, struct hid_item *item)
- {
- dbg("reserved item type, tag 0x%x", item->tag);
- return 0;
- }
- /*
- * Free a report and all registered fields. The field->usage and
- * field->value table's are allocated behind the field, so we need
- * only to free(field) itself.
- */
- static void hid_free_report(struct hid_report *report)
- {
- unsigned n;
- for (n = 0; n < report->maxfield; n++)
- kfree(report->field[n]);
- if (report->data)
- kfree(report->data);
- kfree(report);
- }
- /*
- * Free a device structure, all reports, and all fields.
- */
- static void hid_free_device(struct hid_device *device)
- {
- unsigned i,j;
- for (i = 0; i < HID_REPORT_TYPES; i++) {
- struct hid_report_enum *report_enum = device->report_enum + i;
- for (j = 0; j < 256; j++) {
- struct hid_report *report = report_enum->report_id_hash[j];
- if (report) hid_free_report(report);
- }
- }
- if (device->rdesc) kfree(device->rdesc);
- }
- /*
- * Fetch a report description item from the data stream. We support long
- * items, though they are not used yet.
- */
- static __u8 *fetch_item(__u8 *start, __u8 *end, struct hid_item *item)
- {
- if ((end - start) > 0) {
- __u8 b = *start++;
- item->type = (b >> 2) & 3;
- item->tag = (b >> 4) & 15;
- if (item->tag == HID_ITEM_TAG_LONG) {
- item->format = HID_ITEM_FORMAT_LONG;
- if ((end - start) >= 2) {
- item->size = *start++;
- item->tag = *start++;
- if ((end - start) >= item->size) {
- item->data.longdata = start;
- start += item->size;
- return start;
- }
- }
- } else {
- item->format = HID_ITEM_FORMAT_SHORT;
- item->size = b & 3;
- switch (item->size) {
- case 0:
- return start;
- case 1:
- if ((end - start) >= 1) {
- item->data.u8 = *start++;
- return start;
- }
- break;
- case 2:
- if ((end - start) >= 2) {
- item->data.u16 = le16_to_cpu( get_unaligned(((__u16*)start)++));
- return start;
- }
- case 3:
- item->size++;
- if ((end - start) >= 4) {
- item->data.u32 = le32_to_cpu( get_unaligned(((__u32*)start)++));
- return start;
- }
- }
- }
- }
- return NULL;
- }
- /*
- * Parse a report description into a hid_device structure. Reports are
- * enumerated, fields are attached to these reports.
- */
- static struct hid_device *hid_parse_report(__u8 *start, unsigned size)
- {
- struct hid_device *device;
- struct hid_parser *parser;
- struct hid_item item;
- __u8 *end;
- unsigned i;
- static int (*dispatch_type[])(struct hid_parser *parser,
- struct hid_item *item) = {
- hid_parser_main,
- hid_parser_global,
- hid_parser_local,
- hid_parser_reserved
- };
- if (!(device = kmalloc(sizeof(struct hid_device), GFP_KERNEL)))
- return NULL;
- memset(device, 0, sizeof(struct hid_device));
- for (i = 0; i < HID_REPORT_TYPES; i++)
- INIT_LIST_HEAD(&device->report_enum[i].report_list);
- if (!(device->rdesc = (__u8 *)kmalloc(size, GFP_KERNEL))) {
- kfree(device);
- return NULL;
- }
- memcpy(device->rdesc, start, size);
- if (!(parser = kmalloc(sizeof(struct hid_parser), GFP_KERNEL))) {
- kfree(device->rdesc);
- kfree(device);
- return NULL;
- }
- memset(parser, 0, sizeof(struct hid_parser));
- parser->device = device;
- end = start + size;
- while ((start = fetch_item(start, end, &item)) != 0) {
- if (item.format != HID_ITEM_FORMAT_SHORT) {
- dbg("unexpected long global item");
- hid_free_device(device);
- kfree(parser);
- return NULL;
- }
- if (dispatch_type[item.type](parser, &item)) {
- dbg("item %u %u %u %u parsing failedn",
- item.format, (unsigned)item.size, (unsigned)item.type, (unsigned)item.tag);
- hid_free_device(device);
- kfree(parser);
- return NULL;
- }
- if (start == end) {
- if (parser->collection_stack_ptr) {
- dbg("unbalanced collection at end of report description");
- hid_free_device(device);
- kfree(parser);
- return NULL;
- }
- if (parser->local.delimiter_depth) {
- dbg("unbalanced delimiter at end of report description");
- hid_free_device(device);
- kfree(parser);
- return NULL;
- }
- kfree(parser);
- return device;
- }
- }
- dbg("item fetching failed at offset %dn", (int)(end - start));
- hid_free_device(device);
- kfree(parser);
- return NULL;
- }
- /*
- * Convert a signed n-bit integer to signed 32-bit integer. Common
- * cases are done through the compiler, the screwed things has to be
- * done by hand.
- */
- static __inline__ __s32 snto32(__u32 value, unsigned n)
- {
- switch (n) {
- case 8: return ((__s8)value);
- case 16: return ((__s16)value);
- case 32: return ((__s32)value);
- }
- return value & (1 << (n - 1)) ? value | (-1 << n) : value;
- }
- /*
- * Convert a signed 32-bit integer to a signed n-bit integer.
- */
- static __inline__ __u32 s32ton(__s32 value, unsigned n)
- {
- __s32 a = value >> (n - 1);
- if (a && a != -1) return value < 0 ? 1 << (n - 1) : (1 << (n - 1)) - 1;
- return value & ((1 << n) - 1);
- }
- /*
- * Extract/implement a data field from/to a report.
- */
- static __inline__ __u32 extract(__u8 *report, unsigned offset, unsigned n)
- {
- report += (offset >> 5) << 2; offset &= 31;
- return (le64_to_cpu(get_unaligned((__u64*)report)) >> offset) & ((1 << n) - 1);
- }
- static __inline__ void implement(__u8 *report, unsigned offset, unsigned n, __u32 value)
- {
- report += (offset >> 5) << 2; offset &= 31;
- put_unaligned((get_unaligned((__u64*)report)
- & cpu_to_le64(~((((__u64) 1 << n) - 1) << offset)))
- | cpu_to_le64((__u64)value << offset), (__u64*)report);
- }
- /*
- * Search an array for a value.
- */
- static __inline__ int search(__s32 *array, __s32 value, unsigned n)
- {
- while (n--) if (*array++ == value) return 0;
- return -1;
- }
- static void hid_process_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value)
- {
- hid_dump_input(usage, value);
- if (hid->claimed & HID_CLAIMED_INPUT)
- hidinput_hid_event(hid, field, usage, value);
- if (hid->claimed & HID_CLAIMED_HIDDEV)
- hiddev_hid_event(hid, usage->hid, value);
- }
- /*
- * Analyse a received field, and fetch the data from it. The field
- * content is stored for next report processing (we do differential
- * reporting to the layer).
- */
- static void hid_input_field(struct hid_device *hid, struct hid_field *field, __u8 *data)
- {
- unsigned n;
- unsigned count = field->report_count;
- unsigned offset = field->report_offset;
- unsigned size = field->report_size;
- __s32 min = field->logical_minimum;
- __s32 max = field->logical_maximum;
- __s32 value[count]; /* WARNING: gcc specific */
- for (n = 0; n < count; n++) {
- value[n] = min < 0 ? snto32(extract(data, offset + n * size, size), size) :
- extract(data, offset + n * size, size);
- if (!(field->flags & HID_MAIN_ITEM_VARIABLE) /* Ignore report if ErrorRollOver */
- && value[n] >= min && value[n] <= max
- && field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1)
- return;
- }
- for (n = 0; n < count; n++) {
- if (HID_MAIN_ITEM_VARIABLE & field->flags) {
- if (field->flags & HID_MAIN_ITEM_RELATIVE) {
- if (!value[n]) continue;
- } else {
- if (value[n] == field->value[n]) continue;
- }
- hid_process_event(hid, field, &field->usage[n], value[n]);
- continue;
- }
- if (field->value[n] >= min && field->value[n] <= max
- && field->usage[field->value[n] - min].hid
- && search(value, field->value[n], count))
- hid_process_event(hid, field, &field->usage[field->value[n] - min], 0);
- if (value[n] >= min && value[n] <= max
- && field->usage[value[n] - min].hid
- && search(field->value, value[n], count))
- hid_process_event(hid, field, &field->usage[value[n] - min], 1);
- }
- memcpy(field->value, value, count * sizeof(__s32));
- }
- static int hid_input_report(int type, u8 *data, int len, struct hid_device *hid)
- {
- struct hid_report_enum *report_enum = hid->report_enum + type;
- struct hid_report *report;
- int n, size;
- if (!len) {
- dbg("empty report");
- return -1;
- }
- #ifdef DEBUG_DATA
- printk(KERN_DEBUG __FILE__ ": report (size %u) (%snumbered)n", len, report_enum->numbered ? "" : "un");
- #endif
- n = 0; /* Normally report number is 0 */
- if (report_enum->numbered) { /* Device uses numbered reports, data[0] is report number */
- n = *data++;
- len--;
- }
- if (!(report = report_enum->report_id_hash[n])) {
- dbg("undefined report_id %d received", n);
- #ifdef DEBUG
- printk(KERN_DEBUG __FILE__ ": report (size %u) = ", len);
- for (n = 0; n < len; n++)
- printk(" %02x", data[n]);
- printk("n");
- #endif
- return -1;
- }
- size = ((report->size - 1) >> 3) + 1;
- if (len < size) {
- if (size <= 8) {
- dbg("report %d is too short, (%d < %d)", report->id, len, size);
- return -1;
- }
- /*
- * Some low-speed devices have large reports and maxpacketsize 8.
- * We buffer the data in that case and parse it when we got it all.
- * Works only for unnumbered reports. Doesn't make sense for numbered
- * reports anyway - then they don't need to be large.
- */
- if (!report->data)
- if (!(report->data = kmalloc(size, GFP_ATOMIC))) {
- dbg("couldn't allocate report buffer");
- return -1;
- }
- if (report->idx + len > size) {
- dbg("report data buffer overflow");
- report->idx = 0;
- return -1;
- }
- memcpy(report->data + report->idx, data, len);
- report->idx += len;
- if (report->idx < size)
- return 0;
- data = report->data;
- }
- for (n = 0; n < report->maxfield; n++)
- hid_input_field(hid, report->field[n], data);
- report->idx = 0;
- return 0;
- }
- /*
- * Interrupt input handler.
- */
- static void hid_irq(struct urb *urb)
- {
- if (urb->status) {
- dbg("nonzero status in irq %d", urb->status);
- return;
- }
- hid_input_report(HID_INPUT_REPORT, urb->transfer_buffer, urb->actual_length, urb->context);
- }
- /*
- * hid_read_report() reads in report values without waiting for an irq urb.
- */
- void hid_read_report(struct hid_device *hid, struct hid_report *report)
- {
- int len = ((report->size - 1) >> 3) + 1 + hid->report_enum[report->type].numbered;
- u8 data[len];
- int read;
- if (hid->quirks & HID_QUIRK_NOGET)
- return;
- if ((read = usb_get_report(hid->dev, hid->ifnum, report->type + 1, report->id, data, len)) != len) {
- dbg("reading report type %d id %d failed len %d read %d", report->type + 1, report->id, len, read);
- return;
- }
- hid_input_report(report->type, data, len, hid);
- }
- /*
- * Output the field into the report.
- */
- static void hid_output_field(struct hid_field *field, __u8 *data)
- {
- unsigned count = field->report_count;
- unsigned offset = field->report_offset;
- unsigned size = field->report_size;
- unsigned n;
- for (n = 0; n < count; n++) {
- if (field->logical_minimum < 0) /* signed values */
- implement(data, offset + n * size, size, s32ton(field->value[n], size));
- else /* unsigned values */
- implement(data, offset + n * size, size, field->value[n]);
- }
- }
- /*
- * Create a report.
- */
- void hid_output_report(struct hid_report *report, __u8 *data)
- {
- unsigned n;
- for (n = 0; n < report->maxfield; n++)
- hid_output_field(report->field[n], data);
- }
- /*
- * Set a field value. The report this field belongs to has to be
- * created and transfered to the device, to set this value in the
- * device.
- */
- int hid_set_field(struct hid_field *field, unsigned offset, __s32 value)
- {
- unsigned size = field->report_size;
- hid_dump_input(field->usage + offset, value);
- if (offset >= field->report_count) {
- dbg("offset exceeds report_count");
- return -1;
- }
- if (field->logical_minimum < 0) {
- if (value != snto32(s32ton(value, size), size)) {
- dbg("value %d is out of range", value);
- return -1;
- }
- }
- if ( (value > field->logical_maximum)
- || (value < field->logical_minimum)) {
- dbg("value %d is invalid", value);
- return -1;
- }
- field->value[offset] = value;
- return 0;
- }
- int hid_find_field(struct hid_device *hid, unsigned int type, unsigned int code, struct hid_field **field)
- {
- struct hid_report_enum *report_enum = hid->report_enum + HID_OUTPUT_REPORT;
- struct list_head *list = report_enum->report_list.next;
- int i, j;
- while (list != &report_enum->report_list) {
- struct hid_report *report = (struct hid_report *) list;
- list = list->next;
- for (i = 0; i < report->maxfield; i++) {
- *field = report->field[i];
- for (j = 0; j < (*field)->maxusage; j++)
- if ((*field)->usage[j].type == type && (*field)->usage[j].code == code)
- return j;
- }
- }
- return -1;
- }
- static int hid_submit_out(struct hid_device *hid)
- {
- hid->urbout.transfer_buffer_length = le16_to_cpup(&hid->out[hid->outtail].dr.wLength);
- hid->urbout.transfer_buffer = hid->out[hid->outtail].buffer;
- hid->urbout.setup_packet = (void *) &(hid->out[hid->outtail].dr);
- hid->urbout.dev = hid->dev;
- if (usb_submit_urb(&hid->urbout)) {
- err("usb_submit_urb(out) failed");
- return -1;
- }
- return 0;
- }
- static void hid_ctrl(struct urb *urb)
- {
- struct hid_device *hid = urb->context;
- if (urb->status)
- warn("ctrl urb status %d received", urb->status);
- hid->outtail = (hid->outtail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
- if (hid->outhead != hid->outtail)
- hid_submit_out(hid);
- }
- void hid_write_report(struct hid_device *hid, struct hid_report *report)
- {
- hid_output_report(report, hid->out[hid->outhead].buffer);
- hid->out[hid->outhead].dr.wValue = cpu_to_le16(0x200 | report->id);
- hid->out[hid->outhead].dr.wLength = cpu_to_le16((report->size + 7) >> 3);
- hid->outhead = (hid->outhead + 1) & (HID_CONTROL_FIFO_SIZE - 1);
- if (hid->outhead == hid->outtail)
- hid->outtail = (hid->outtail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
- if (hid->urbout.status != -EINPROGRESS)
- hid_submit_out(hid);
- }
- int hid_open(struct hid_device *hid)
- {
- if (hid->open++)
- return 0;
- hid->urb.dev = hid->dev;
- if (usb_submit_urb(&hid->urb))
- return -EIO;
- return 0;
- }
- void hid_close(struct hid_device *hid)
- {
- if (!--hid->open)
- usb_unlink_urb(&hid->urb);
- }
- /*
- * Initialize all readable reports
- */
- void hid_init_reports(struct hid_device *hid)
- {
- int i;
- struct hid_report *report;
- struct hid_report_enum *report_enum;
- struct list_head *list;
- for (i = 0; i < HID_REPORT_TYPES; i++) {
- if (i == HID_FEATURE_REPORT || i == HID_INPUT_REPORT) {
- report_enum = hid->report_enum + i;
- list = report_enum->report_list.next;
- while (list != &report_enum->report_list) {
- report = (struct hid_report *) list;
- hid_read_report(hid, report);
- usb_set_idle(hid->dev, hid->ifnum, 0, report->id);
- list = list->next;
- }
- }
- }
- }
- #define USB_VENDOR_ID_WACOM 0x056a
- #define USB_DEVICE_ID_WACOM_PENPARTNER 0x0000
- #define USB_DEVICE_ID_WACOM_GRAPHIRE 0x0010
- #define USB_DEVICE_ID_WACOM_INTUOS 0x0020
- #define USB_DEVICE_ID_WACOM_PL 0x0030
- #define USB_DEVICE_ID_WACOM_INTUOS2 0x0041
- #define USB_VENDOR_ID_ATEN 0x0557
- #define USB_DEVICE_ID_ATEN_UC100KM 0x2004
- #define USB_DEVICE_ID_ATEN_CS124U 0x2202
- #define USB_DEVICE_ID_ATEN_2PORTKVM 0x2204
- #define USB_DEVICE_ID_ATEN_4PORTKVM 0x2205
- struct hid_blacklist {
- __u16 idVendor;
- __u16 idProduct;
- unsigned quirks;
- } hid_blacklist[] = {
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_PENPARTNER, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_GRAPHIRE, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_GRAPHIRE + 1, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_GRAPHIRE + 2, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_INTUOS, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_INTUOS + 1, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_INTUOS + 2, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_INTUOS + 3, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_INTUOS + 4, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_PL, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_PL + 1, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_PL + 2, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_PL + 3, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_PL + 4, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_PL + 5, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_INTUOS2, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_INTUOS2 + 1, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_INTUOS2 + 2, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_INTUOS2 + 3, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_INTUOS2 + 4, HID_QUIRK_IGNORE },
- { USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_UC100KM, HID_QUIRK_NOGET },
- { USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_CS124U, HID_QUIRK_NOGET },
- { USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_2PORTKVM, HID_QUIRK_NOGET },
- { USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_4PORTKVM, HID_QUIRK_NOGET },
- { 0, 0 }
- };
- static struct hid_device *usb_hid_configure(struct usb_device *dev, int ifnum)
- {
- struct usb_interface_descriptor *interface = dev->actconfig->interface[ifnum].altsetting + 0;
- struct hid_descriptor *hdesc;
- struct hid_device *hid;
- unsigned quirks = 0, rsize = 0;
- char *buf;
- int n;
- for (n = 0; hid_blacklist[n].idVendor; n++)
- if ((hid_blacklist[n].idVendor == dev->descriptor.idVendor) &&
- (hid_blacklist[n].idProduct == dev->descriptor.idProduct))
- quirks = hid_blacklist[n].quirks;
- if (quirks & HID_QUIRK_IGNORE)
- return NULL;
- if (usb_get_extra_descriptor(interface, USB_DT_HID, &hdesc) && ((!interface->bNumEndpoints) ||
- usb_get_extra_descriptor(&interface->endpoint[0], USB_DT_HID, &hdesc))) {
- dbg("class descriptor not presentn");
- return NULL;
- }
- for (n = 0; n < hdesc->bNumDescriptors; n++)
- if (hdesc->desc[n].bDescriptorType == USB_DT_REPORT)
- rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);
- if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
- dbg("weird size of report descriptor (%u)", rsize);
- return NULL;
- }
- {
- __u8 rdesc[rsize];
- if ((n = usb_get_class_descriptor(dev, interface->bInterfaceNumber, USB_DT_REPORT, 0, rdesc, rsize)) < 0) {
- dbg("reading report descriptor failed");
- return NULL;
- }
- #ifdef DEBUG_DATA
- printk(KERN_DEBUG __FILE__ ": report descriptor (size %u, read %d) = ", rsize, n);
- for (n = 0; n < rsize; n++)
- printk(" %02x", (unsigned) rdesc[n]);
- printk("n");
- #endif
- if (!(hid = hid_parse_report(rdesc, rsize))) {
- dbg("parsing report descriptor failed");
- return NULL;
- }
- }
- hid->quirks = quirks;
- for (n = 0; n < interface->bNumEndpoints; n++) {
- struct usb_endpoint_descriptor *endpoint = &interface->endpoint[n];
- int pipe, maxp;
- if ((endpoint->bmAttributes & 3) != 3) /* Not an interrupt endpoint */
- continue;
- if (!(endpoint->bEndpointAddress & 0x80)) /* Not an input endpoint */
- continue;
- pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
- maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
- FILL_INT_URB(&hid->urb, dev, pipe, hid->buffer, maxp > 32 ? 32 : maxp, hid_irq, hid, endpoint->bInterval);
- break;
- }
- if (n == interface->bNumEndpoints) {
- dbg("couldn't find an input interrupt endpoint");
- hid_free_device(hid);
- return NULL;
- }
- hid->version = hdesc->bcdHID;
- hid->country = hdesc->bCountryCode;
- hid->dev = dev;
- hid->ifnum = interface->bInterfaceNumber;
- for (n = 0; n < HID_CONTROL_FIFO_SIZE; n++) {
- hid->out[n].dr.bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE;
- hid->out[n].dr.bRequest = USB_REQ_SET_REPORT;
- hid->out[n].dr.wIndex = cpu_to_le16(hid->ifnum);
- }
- hid->name[0] = 0;
- if (!(buf = kmalloc(63, GFP_KERNEL)))
- return NULL;
- if (usb_string(dev, dev->descriptor.iManufacturer, buf, 63) > 0) {
- strcat(hid->name, buf);
- if (usb_string(dev, dev->descriptor.iProduct, buf, 63) > 0)
- sprintf(hid->name, "%s %s", hid->name, buf);
- } else
- sprintf(hid->name, "%04x:%04x", dev->descriptor.idVendor, dev->descriptor.idProduct);
- kfree(buf);
- FILL_CONTROL_URB(&hid->urbout, dev, usb_sndctrlpipe(dev, 0),
- (void*) &hid->out[0].dr, hid->out[0].buffer, 1, hid_ctrl, hid);
- /*
- * Some devices don't like this and crash. I don't know of any devices
- * needing this, so it is disabled for now.
- */
- #if 0
- if (interface->bInterfaceSubClass == 1)
- usb_set_protocol(dev, hid->ifnum, 1);
- #endif
- return hid;
- }
- static void* hid_probe(struct usb_device *dev, unsigned int ifnum,
- const struct usb_device_id *id)
- {
- struct hid_device *hid;
- int i;
- char *c;
- dbg("HID probe called for ifnum %d", ifnum);
- if (!(hid = usb_hid_configure(dev, ifnum)))
- return NULL;
- hid_init_reports(hid);
- hid_dump_device(hid);
- if (!hidinput_connect(hid))
- hid->claimed |= HID_CLAIMED_INPUT;
- if (!hiddev_connect(hid))
- hid->claimed |= HID_CLAIMED_HIDDEV;
- printk(KERN_INFO);
- if (hid->claimed & HID_CLAIMED_INPUT)
- printk("input%d", hid->input.number);
- if (hid->claimed == (HID_CLAIMED_INPUT | HID_CLAIMED_HIDDEV))
- printk(",");
- if (hid->claimed & HID_CLAIMED_HIDDEV)
- printk("hiddev%d", hid->minor);
- c = "Device";
- for (i = 0; i < hid->maxapplication; i++)
- if ((hid->application[i] & 0xffff) < ARRAY_SIZE(hid_types)) {
- c = hid_types[hid->application[i] & 0xffff];
- break;
- }
- printk(": USB HID v%x.%02x %s [%s] on usb%d:%d.%dn",
- hid->version >> 8, hid->version & 0xff, c, hid->name,
- dev->bus->busnum, dev->devnum, ifnum);
- return hid;
- }
- static void hid_disconnect(struct usb_device *dev, void *ptr)
- {
- struct hid_device *hid = ptr;
- dbg("cleanup called");
- usb_unlink_urb(&hid->urb);
- if (hid->claimed & HID_CLAIMED_INPUT)
- hidinput_disconnect(hid);
- if (hid->claimed & HID_CLAIMED_HIDDEV)
- hiddev_disconnect(hid);
- hid_free_device(hid);
- }
- static struct usb_device_id hid_usb_ids [] = {
- { match_flags: USB_DEVICE_ID_MATCH_INT_CLASS,
- bInterfaceClass: USB_INTERFACE_CLASS_HID },
- { } /* Terminating entry */
- };
- MODULE_DEVICE_TABLE (usb, hid_usb_ids);
- static struct usb_driver hid_driver = {
- name: "hid",
- probe: hid_probe,
- disconnect: hid_disconnect,
- id_table: hid_usb_ids,
- };
- static int __init hid_init(void)
- {
- hiddev_init();
- usb_register(&hid_driver);
- info(DRIVER_VERSION " " DRIVER_AUTHOR);
- info(DRIVER_DESC);
- return 0;
- }
- static void __exit hid_exit(void)
- {
- hiddev_exit();
- usb_deregister(&hid_driver);
- }
- module_init(hid_init);
- module_exit(hid_exit);
- MODULE_AUTHOR( DRIVER_AUTHOR );
- MODULE_DESCRIPTION( DRIVER_DESC );
- MODULE_LICENSE("GPL");