diff options
Diffstat (limited to 'drivers/hid/hid-core.c')
| -rw-r--r-- | drivers/hid/hid-core.c | 2658 |
1 files changed, 2658 insertions, 0 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c new file mode 100644 index 000000000..476967ab6 --- /dev/null +++ b/drivers/hid/hid-core.c @@ -0,0 +1,2658 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HID support for Linux + * + * Copyright (c) 1999 Andreas Gal + * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> + * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc + * Copyright (c) 2006-2012 Jiri Kosina + */ + +/* + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/mm.h> +#include <linux/spinlock.h> +#include <asm/unaligned.h> +#include <asm/byteorder.h> +#include <linux/input.h> +#include <linux/wait.h> +#include <linux/vmalloc.h> +#include <linux/sched.h> +#include <linux/semaphore.h> + +#include <linux/hid.h> +#include <linux/hiddev.h> +#include <linux/hid-debug.h> +#include <linux/hidraw.h> + +#include "hid-ids.h" + +/* + * Version Information + */ + +#define DRIVER_DESC "HID core driver" + +int hid_debug = 0; +module_param_named(debug, hid_debug, int, 0600); +MODULE_PARM_DESC(debug, "toggle HID debugging messages"); +EXPORT_SYMBOL_GPL(hid_debug); + +static int hid_ignore_special_drivers = 0; +module_param_named(ignore_special_drivers, hid_ignore_special_drivers, int, 0600); +MODULE_PARM_DESC(ignore_special_drivers, "Ignore any special drivers and handle all devices by generic driver"); + +/* + * Register a new report for a device. + */ + +struct hid_report *hid_register_report(struct hid_device *device, + unsigned int type, unsigned int id, + unsigned int application) +{ + struct hid_report_enum *report_enum = device->report_enum + type; + struct hid_report *report; + + if (id >= HID_MAX_IDS) + return NULL; + if (report_enum->report_id_hash[id]) + return report_enum->report_id_hash[id]; + + report = kzalloc(sizeof(struct hid_report), GFP_KERNEL); + if (!report) + return NULL; + + if (id != 0) + report_enum->numbered = 1; + + report->id = id; + report->type = type; + report->size = 0; + report->device = device; + report->application = application; + report_enum->report_id_hash[id] = report; + + list_add_tail(&report->list, &report_enum->report_list); + + return report; +} +EXPORT_SYMBOL_GPL(hid_register_report); + +/* + * Register a new field for this report. + */ + +static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages) +{ + struct hid_field *field; + + if (report->maxfield == HID_MAX_FIELDS) { + hid_err(report->device, "too many fields in report\n"); + return NULL; + } + + field = kzalloc((sizeof(struct hid_field) + + usages * sizeof(struct hid_usage) + + usages * sizeof(unsigned)), GFP_KERNEL); + if (!field) + return NULL; + + field->index = report->maxfield++; + report->field[field->index] = field; + field->usage = (struct hid_usage *)(field + 1); + field->value = (s32 *)(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; + int collection_index; + + usage = parser->local.usage[0]; + + if (parser->collection_stack_ptr == parser->collection_stack_size) { + unsigned int *collection_stack; + unsigned int new_size = parser->collection_stack_size + + HID_COLLECTION_STACK_SIZE; + + collection_stack = krealloc(parser->collection_stack, + new_size * sizeof(unsigned int), + GFP_KERNEL); + if (!collection_stack) + return -ENOMEM; + + parser->collection_stack = collection_stack; + parser->collection_stack_size = new_size; + } + + if (parser->device->maxcollection == parser->device->collection_size) { + collection = kmalloc( + array3_size(sizeof(struct hid_collection), + parser->device->collection_size, + 2), + GFP_KERNEL); + if (collection == NULL) { + hid_err(parser->device, "failed to reallocate collection array\n"); + return -ENOMEM; + } + memcpy(collection, parser->device->collection, + sizeof(struct hid_collection) * + parser->device->collection_size); + memset(collection + parser->device->collection_size, 0, + sizeof(struct hid_collection) * + parser->device->collection_size); + kfree(parser->device->collection); + parser->device->collection = collection; + parser->device->collection_size *= 2; + } + + parser->collection_stack[parser->collection_stack_ptr++] = + parser->device->maxcollection; + + collection_index = parser->device->maxcollection++; + collection = parser->device->collection + collection_index; + collection->type = type; + collection->usage = usage; + collection->level = parser->collection_stack_ptr - 1; + collection->parent_idx = (collection->level == 0) ? -1 : + parser->collection_stack[collection->level - 1]; + + if (type == HID_COLLECTION_APPLICATION) + parser->device->maxapplication++; + + return 0; +} + +/* + * Close a collection. + */ + +static int close_collection(struct hid_parser *parser) +{ + if (!parser->collection_stack_ptr) { + hid_err(parser->device, "collection stack underflow\n"); + return -EINVAL; + } + 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) +{ + struct hid_collection *collection = parser->device->collection; + int n; + + for (n = parser->collection_stack_ptr - 1; n >= 0; n--) { + unsigned index = parser->collection_stack[n]; + if (collection[index].type == type) + return collection[index].usage; + } + return 0; /* we know nothing about this usage type */ +} + +/* + * Concatenate usage which defines 16 bits or less with the + * currently defined usage page to form a 32 bit usage + */ + +static void complete_usage(struct hid_parser *parser, unsigned int index) +{ + parser->local.usage[index] &= 0xFFFF; + parser->local.usage[index] |= + (parser->global.usage_page & 0xFFFF) << 16; +} + +/* + * Add a usage to the temporary parser table. + */ + +static int hid_add_usage(struct hid_parser *parser, unsigned usage, u8 size) +{ + if (parser->local.usage_index >= HID_MAX_USAGES) { + hid_err(parser->device, "usage index exceeded\n"); + return -1; + } + parser->local.usage[parser->local.usage_index] = usage; + + /* + * If Usage item only includes usage id, concatenate it with + * currently defined usage page + */ + if (size <= 2) + complete_usage(parser, parser->local.usage_index); + + parser->local.usage_size[parser->local.usage_index] = size; + parser->local.collection_index[parser->local.usage_index] = + parser->collection_stack_ptr ? + parser->collection_stack[parser->collection_stack_ptr - 1] : 0; + parser->local.usage_index++; + 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; + unsigned int max_buffer_size = HID_MAX_BUFFER_SIZE; + unsigned int usages; + unsigned int offset; + unsigned int i; + unsigned int application; + + application = hid_lookup_collection(parser, HID_COLLECTION_APPLICATION); + + report = hid_register_report(parser->device, report_type, + parser->global.report_id, application); + if (!report) { + hid_err(parser->device, "hid_register_report failed\n"); + return -1; + } + + /* Handle both signed and unsigned cases properly */ + if ((parser->global.logical_minimum < 0 && + parser->global.logical_maximum < + parser->global.logical_minimum) || + (parser->global.logical_minimum >= 0 && + (__u32)parser->global.logical_maximum < + (__u32)parser->global.logical_minimum)) { + dbg_hid("logical range invalid 0x%x 0x%x\n", + parser->global.logical_minimum, + parser->global.logical_maximum); + return -1; + } + + offset = report->size; + report->size += parser->global.report_size * parser->global.report_count; + + if (parser->device->ll_driver->max_buffer_size) + max_buffer_size = parser->device->ll_driver->max_buffer_size; + + /* Total size check: Allow for possible report index byte */ + if (report->size > (max_buffer_size - 1) << 3) { + hid_err(parser->device, "report is too long\n"); + return -1; + } + + if (!parser->local.usage_index) /* Ignore padding fields */ + return 0; + + usages = max_t(unsigned, parser->local.usage_index, + parser->global.report_count); + + field = hid_register_field(report, usages); + if (!field) + return 0; + + field->physical = hid_lookup_collection(parser, HID_COLLECTION_PHYSICAL); + field->logical = hid_lookup_collection(parser, HID_COLLECTION_LOGICAL); + field->application = application; + + for (i = 0; i < usages; i++) { + unsigned j = i; + /* Duplicate the last usage we parsed if we have excess values */ + if (i >= parser->local.usage_index) + j = parser->local.usage_index - 1; + field->usage[i].hid = parser->local.usage[j]; + field->usage[i].collection_index = + parser->local.collection_index[j]; + field->usage[i].usage_index = i; + field->usage[i].resolution_multiplier = 1; + } + + 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 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 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) +{ + __s32 raw_value; + switch (item->tag) { + case HID_GLOBAL_ITEM_TAG_PUSH: + + if (parser->global_stack_ptr == HID_GLOBAL_STACK_SIZE) { + hid_err(parser->device, "global environment stack overflow\n"); + 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) { + hid_err(parser->device, "global environment stack underflow\n"); + 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: + /* Many devices provide unit exponent as a two's complement + * nibble due to the common misunderstanding of HID + * specification 1.11, 6.2.2.7 Global Items. Attempt to handle + * both this and the standard encoding. */ + raw_value = item_sdata(item); + if (!(raw_value & 0xfffffff0)) + parser->global.unit_exponent = hid_snto32(raw_value, 4); + else + parser->global.unit_exponent = raw_value; + return 0; + + case HID_GLOBAL_ITEM_TAG_UNIT: + parser->global.unit = item_udata(item); + return 0; + + case HID_GLOBAL_ITEM_TAG_REPORT_SIZE: + parser->global.report_size = item_udata(item); + if (parser->global.report_size > 256) { + hid_err(parser->device, "invalid report_size %d\n", + parser->global.report_size); + return -1; + } + return 0; + + case HID_GLOBAL_ITEM_TAG_REPORT_COUNT: + parser->global.report_count = item_udata(item); + if (parser->global.report_count > HID_MAX_USAGES) { + hid_err(parser->device, "invalid report_count %d\n", + parser->global.report_count); + return -1; + } + return 0; + + case HID_GLOBAL_ITEM_TAG_REPORT_ID: + parser->global.report_id = item_udata(item); + if (parser->global.report_id == 0 || + parser->global.report_id >= HID_MAX_IDS) { + hid_err(parser->device, "report_id %u is invalid\n", + parser->global.report_id); + return -1; + } + return 0; + + default: + hid_err(parser->device, "unknown global tag 0x%x\n", 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; + __u32 count; + + 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) { + hid_err(parser->device, "nested delimiters\n"); + return -1; + } + parser->local.delimiter_depth++; + parser->local.delimiter_branch++; + } else { + if (parser->local.delimiter_depth < 1) { + hid_err(parser->device, "bogus close delimiter\n"); + return -1; + } + parser->local.delimiter_depth--; + } + return 0; + + case HID_LOCAL_ITEM_TAG_USAGE: + + if (parser->local.delimiter_branch > 1) { + dbg_hid("alternative usage ignored\n"); + return 0; + } + + return hid_add_usage(parser, data, item->size); + + case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM: + + if (parser->local.delimiter_branch > 1) { + dbg_hid("alternative usage ignored\n"); + return 0; + } + + parser->local.usage_minimum = data; + return 0; + + case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM: + + if (parser->local.delimiter_branch > 1) { + dbg_hid("alternative usage ignored\n"); + return 0; + } + + count = data - parser->local.usage_minimum; + if (count + parser->local.usage_index >= HID_MAX_USAGES) { + /* + * We do not warn if the name is not set, we are + * actually pre-scanning the device. + */ + if (dev_name(&parser->device->dev)) + hid_warn(parser->device, + "ignoring exceeding usage max\n"); + data = HID_MAX_USAGES - parser->local.usage_index + + parser->local.usage_minimum - 1; + if (data <= 0) { + hid_err(parser->device, + "no more usage index available\n"); + return -1; + } + } + + for (n = parser->local.usage_minimum; n <= data; n++) + if (hid_add_usage(parser, n, item->size)) { + dbg_hid("hid_add_usage failed\n"); + return -1; + } + return 0; + + default: + + dbg_hid("unknown local item tag 0x%x\n", item->tag); + return 0; + } + return 0; +} + +/* + * Concatenate Usage Pages into Usages where relevant: + * As per specification, 6.2.2.8: "When the parser encounters a main item it + * concatenates the last declared Usage Page with a Usage to form a complete + * usage value." + */ + +static void hid_concatenate_last_usage_page(struct hid_parser *parser) +{ + int i; + unsigned int usage_page; + unsigned int current_page; + + if (!parser->local.usage_index) + return; + + usage_page = parser->global.usage_page; + + /* + * Concatenate usage page again only if last declared Usage Page + * has not been already used in previous usages concatenation + */ + for (i = parser->local.usage_index - 1; i >= 0; i--) { + if (parser->local.usage_size[i] > 2) + /* Ignore extended usages */ + continue; + + current_page = parser->local.usage[i] >> 16; + if (current_page == usage_page) + break; + + complete_usage(parser, i); + } +} + +/* + * Process a main item. + */ + +static int hid_parser_main(struct hid_parser *parser, struct hid_item *item) +{ + __u32 data; + int ret; + + hid_concatenate_last_usage_page(parser); + + data = item_udata(item); + + switch (item->tag) { + case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION: + ret = open_collection(parser, data & 0xff); + 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: + hid_warn(parser->device, "unknown main item tag 0x%x\n", 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_hid("reserved item type, tag 0x%x\n", 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]); + kfree(report); +} + +/* + * Close report. This function returns the device + * state to the point prior to hid_open_report(). + */ +static void hid_close_report(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 < HID_MAX_IDS; j++) { + struct hid_report *report = report_enum->report_id_hash[j]; + if (report) + hid_free_report(report); + } + memset(report_enum, 0, sizeof(*report_enum)); + INIT_LIST_HEAD(&report_enum->report_list); + } + + kfree(device->rdesc); + device->rdesc = NULL; + device->rsize = 0; + + kfree(device->collection); + device->collection = NULL; + device->collection_size = 0; + device->maxcollection = 0; + device->maxapplication = 0; + + device->status &= ~HID_STAT_PARSED; +} + +/* + * Free a device structure, all reports, and all fields. + */ + +void hiddev_free(struct kref *ref) +{ + struct hid_device *hid = container_of(ref, struct hid_device, ref); + + hid_close_report(hid); + kfree(hid->dev_rdesc); + kfree(hid); +} + +static void hid_device_release(struct device *dev) +{ + struct hid_device *hid = to_hid_device(dev); + + kref_put(&hid->ref, hiddev_free); +} + +/* + * 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) +{ + u8 b; + + if ((end - start) <= 0) + return NULL; + + 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) + return NULL; + + item->size = *start++; + item->tag = *start++; + + if ((end - start) < item->size) + return NULL; + + item->data.longdata = start; + start += item->size; + return start; + } + + item->format = HID_ITEM_FORMAT_SHORT; + item->size = b & 3; + + switch (item->size) { + case 0: + return start; + + case 1: + if ((end - start) < 1) + return NULL; + item->data.u8 = *start++; + return start; + + case 2: + if ((end - start) < 2) + return NULL; + item->data.u16 = get_unaligned_le16(start); + start = (__u8 *)((__le16 *)start + 1); + return start; + + case 3: + item->size++; + if ((end - start) < 4) + return NULL; + item->data.u32 = get_unaligned_le32(start); + start = (__u8 *)((__le32 *)start + 1); + return start; + } + + return NULL; +} + +static void hid_scan_input_usage(struct hid_parser *parser, u32 usage) +{ + struct hid_device *hid = parser->device; + + if (usage == HID_DG_CONTACTID) + hid->group = HID_GROUP_MULTITOUCH; +} + +static void hid_scan_feature_usage(struct hid_parser *parser, u32 usage) +{ + if (usage == 0xff0000c5 && parser->global.report_count == 256 && + parser->global.report_size == 8) + parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8; + + if (usage == 0xff0000c6 && parser->global.report_count == 1 && + parser->global.report_size == 8) + parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8; +} + +static void hid_scan_collection(struct hid_parser *parser, unsigned type) +{ + struct hid_device *hid = parser->device; + int i; + + if (((parser->global.usage_page << 16) == HID_UP_SENSOR) && + type == HID_COLLECTION_PHYSICAL) + hid->group = HID_GROUP_SENSOR_HUB; + + if (hid->vendor == USB_VENDOR_ID_MICROSOFT && + hid->product == USB_DEVICE_ID_MS_POWER_COVER && + hid->group == HID_GROUP_MULTITOUCH) + hid->group = HID_GROUP_GENERIC; + + if ((parser->global.usage_page << 16) == HID_UP_GENDESK) + for (i = 0; i < parser->local.usage_index; i++) + if (parser->local.usage[i] == HID_GD_POINTER) + parser->scan_flags |= HID_SCAN_FLAG_GD_POINTER; + + if ((parser->global.usage_page << 16) >= HID_UP_MSVENDOR) + parser->scan_flags |= HID_SCAN_FLAG_VENDOR_SPECIFIC; + + if ((parser->global.usage_page << 16) == HID_UP_GOOGLEVENDOR) + for (i = 0; i < parser->local.usage_index; i++) + if (parser->local.usage[i] == + (HID_UP_GOOGLEVENDOR | 0x0001)) + parser->device->group = + HID_GROUP_VIVALDI; +} + +static int hid_scan_main(struct hid_parser *parser, struct hid_item *item) +{ + __u32 data; + int i; + + hid_concatenate_last_usage_page(parser); + + data = item_udata(item); + + switch (item->tag) { + case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION: + hid_scan_collection(parser, data & 0xff); + break; + case HID_MAIN_ITEM_TAG_END_COLLECTION: + break; + case HID_MAIN_ITEM_TAG_INPUT: + /* ignore constant inputs, they will be ignored by hid-input */ + if (data & HID_MAIN_ITEM_CONSTANT) + break; + for (i = 0; i < parser->local.usage_index; i++) + hid_scan_input_usage(parser, parser->local.usage[i]); + break; + case HID_MAIN_ITEM_TAG_OUTPUT: + break; + case HID_MAIN_ITEM_TAG_FEATURE: + for (i = 0; i < parser->local.usage_index; i++) + hid_scan_feature_usage(parser, parser->local.usage[i]); + break; + } + + /* Reset the local parser environment */ + memset(&parser->local, 0, sizeof(parser->local)); + + return 0; +} + +/* + * Scan a report descriptor before the device is added to the bus. + * Sets device groups and other properties that determine what driver + * to load. + */ +static int hid_scan_report(struct hid_device *hid) +{ + struct hid_parser *parser; + struct hid_item item; + __u8 *start = hid->dev_rdesc; + __u8 *end = start + hid->dev_rsize; + static int (*dispatch_type[])(struct hid_parser *parser, + struct hid_item *item) = { + hid_scan_main, + hid_parser_global, + hid_parser_local, + hid_parser_reserved + }; + + parser = vzalloc(sizeof(struct hid_parser)); + if (!parser) + return -ENOMEM; + + parser->device = hid; + hid->group = HID_GROUP_GENERIC; + + /* + * The parsing is simpler than the one in hid_open_report() as we should + * be robust against hid errors. Those errors will be raised by + * hid_open_report() anyway. + */ + while ((start = fetch_item(start, end, &item)) != NULL) + dispatch_type[item.type](parser, &item); + + /* + * Handle special flags set during scanning. + */ + if ((parser->scan_flags & HID_SCAN_FLAG_MT_WIN_8) && + (hid->group == HID_GROUP_MULTITOUCH)) + hid->group = HID_GROUP_MULTITOUCH_WIN_8; + + /* + * Vendor specific handlings + */ + switch (hid->vendor) { + case USB_VENDOR_ID_WACOM: + hid->group = HID_GROUP_WACOM; + break; + case USB_VENDOR_ID_SYNAPTICS: + if (hid->group == HID_GROUP_GENERIC) + if ((parser->scan_flags & HID_SCAN_FLAG_VENDOR_SPECIFIC) + && (parser->scan_flags & HID_SCAN_FLAG_GD_POINTER)) + /* + * hid-rmi should take care of them, + * not hid-generic + */ + hid->group = HID_GROUP_RMI; + break; + } + + kfree(parser->collection_stack); + vfree(parser); + return 0; +} + +/** + * hid_parse_report - parse device report + * + * @hid: hid device + * @start: report start + * @size: report size + * + * Allocate the device report as read by the bus driver. This function should + * only be called from parse() in ll drivers. + */ +int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size) +{ + hid->dev_rdesc = kmemdup(start, size, GFP_KERNEL); + if (!hid->dev_rdesc) + return -ENOMEM; + hid->dev_rsize = size; + return 0; +} +EXPORT_SYMBOL_GPL(hid_parse_report); + +static const char * const hid_report_names[] = { + "HID_INPUT_REPORT", + "HID_OUTPUT_REPORT", + "HID_FEATURE_REPORT", +}; +/** + * hid_validate_values - validate existing device report's value indexes + * + * @hid: hid device + * @type: which report type to examine + * @id: which report ID to examine (0 for first) + * @field_index: which report field to examine + * @report_counts: expected number of values + * + * Validate the number of values in a given field of a given report, after + * parsing. + */ +struct hid_report *hid_validate_values(struct hid_device *hid, + unsigned int type, unsigned int id, + unsigned int field_index, + unsigned int report_counts) +{ + struct hid_report *report; + + if (type > HID_FEATURE_REPORT) { + hid_err(hid, "invalid HID report type %u\n", type); + return NULL; + } + + if (id >= HID_MAX_IDS) { + hid_err(hid, "invalid HID report id %u\n", id); + return NULL; + } + + /* + * Explicitly not using hid_get_report() here since it depends on + * ->numbered being checked, which may not always be the case when + * drivers go to access report values. + */ + if (id == 0) { + /* + * Validating on id 0 means we should examine the first + * report in the list. + */ + report = list_first_entry_or_null( + &hid->report_enum[type].report_list, + struct hid_report, list); + } else { + report = hid->report_enum[type].report_id_hash[id]; + } + if (!report) { + hid_err(hid, "missing %s %u\n", hid_report_names[type], id); + return NULL; + } + if (report->maxfield <= field_index) { + hid_err(hid, "not enough fields in %s %u\n", + hid_report_names[type], id); + return NULL; + } + if (report->field[field_index]->report_count < report_counts) { + hid_err(hid, "not enough values in %s %u field %u\n", + hid_report_names[type], id, field_index); + return NULL; + } + return report; +} +EXPORT_SYMBOL_GPL(hid_validate_values); + +static int hid_calculate_multiplier(struct hid_device *hid, + struct hid_field *multiplier) +{ + int m; + __s32 v = *multiplier->value; + __s32 lmin = multiplier->logical_minimum; + __s32 lmax = multiplier->logical_maximum; + __s32 pmin = multiplier->physical_minimum; + __s32 pmax = multiplier->physical_maximum; + + /* + * "Because OS implementations will generally divide the control's + * reported count by the Effective Resolution Multiplier, designers + * should take care not to establish a potential Effective + * Resolution Multiplier of zero." + * HID Usage Table, v1.12, Section 4.3.1, p31 + */ + if (lmax - lmin == 0) + return 1; + /* + * Handling the unit exponent is left as an exercise to whoever + * finds a device where that exponent is not 0. + */ + m = ((v - lmin)/(lmax - lmin) * (pmax - pmin) + pmin); + if (unlikely(multiplier->unit_exponent != 0)) { + hid_warn(hid, + "unsupported Resolution Multiplier unit exponent %d\n", + multiplier->unit_exponent); + } + + /* There are no devices with an effective multiplier > 255 */ + if (unlikely(m == 0 || m > 255 || m < -255)) { + hid_warn(hid, "unsupported Resolution Multiplier %d\n", m); + m = 1; + } + + return m; +} + +static void hid_apply_multiplier_to_field(struct hid_device *hid, + struct hid_field *field, + struct hid_collection *multiplier_collection, + int effective_multiplier) +{ + struct hid_collection *collection; + struct hid_usage *usage; + int i; + + /* + * If multiplier_collection is NULL, the multiplier applies + * to all fields in the report. + * Otherwise, it is the Logical Collection the multiplier applies to + * but our field may be in a subcollection of that collection. + */ + for (i = 0; i < field->maxusage; i++) { + usage = &field->usage[i]; + + collection = &hid->collection[usage->collection_index]; + while (collection->parent_idx != -1 && + collection != multiplier_collection) + collection = &hid->collection[collection->parent_idx]; + + if (collection->parent_idx != -1 || + multiplier_collection == NULL) + usage->resolution_multiplier = effective_multiplier; + + } +} + +static void hid_apply_multiplier(struct hid_device *hid, + struct hid_field *multiplier) +{ + struct hid_report_enum *rep_enum; + struct hid_report *rep; + struct hid_field *field; + struct hid_collection *multiplier_collection; + int effective_multiplier; + int i; + + /* + * "The Resolution Multiplier control must be contained in the same + * Logical Collection as the control(s) to which it is to be applied. + * If no Resolution Multiplier is defined, then the Resolution + * Multiplier defaults to 1. If more than one control exists in a + * Logical Collection, the Resolution Multiplier is associated with + * all controls in the collection. If no Logical Collection is + * defined, the Resolution Multiplier is associated with all + * controls in the report." + * HID Usage Table, v1.12, Section 4.3.1, p30 + * + * Thus, search from the current collection upwards until we find a + * logical collection. Then search all fields for that same parent + * collection. Those are the fields the multiplier applies to. + * + * If we have more than one multiplier, it will overwrite the + * applicable fields later. + */ + multiplier_collection = &hid->collection[multiplier->usage->collection_index]; + while (multiplier_collection->parent_idx != -1 && + multiplier_collection->type != HID_COLLECTION_LOGICAL) + multiplier_collection = &hid->collection[multiplier_collection->parent_idx]; + + effective_multiplier = hid_calculate_multiplier(hid, multiplier); + + rep_enum = &hid->report_enum[HID_INPUT_REPORT]; + list_for_each_entry(rep, &rep_enum->report_list, list) { + for (i = 0; i < rep->maxfield; i++) { + field = rep->field[i]; + hid_apply_multiplier_to_field(hid, field, + multiplier_collection, + effective_multiplier); + } + } +} + +/* + * hid_setup_resolution_multiplier - set up all resolution multipliers + * + * @device: hid device + * + * Search for all Resolution Multiplier Feature Reports and apply their + * value to all matching Input items. This only updates the internal struct + * fields. + * + * The Resolution Multiplier is applied by the hardware. If the multiplier + * is anything other than 1, the hardware will send pre-multiplied events + * so that the same physical interaction generates an accumulated + * accumulated_value = value * * multiplier + * This may be achieved by sending + * - "value * multiplier" for each event, or + * - "value" but "multiplier" times as frequently, or + * - a combination of the above + * The only guarantee is that the same physical interaction always generates + * an accumulated 'value * multiplier'. + * + * This function must be called before any event processing and after + * any SetRequest to the Resolution Multiplier. + */ +void hid_setup_resolution_multiplier(struct hid_device *hid) +{ + struct hid_report_enum *rep_enum; + struct hid_report *rep; + struct hid_usage *usage; + int i, j; + + rep_enum = &hid->report_enum[HID_FEATURE_REPORT]; + list_for_each_entry(rep, &rep_enum->report_list, list) { + for (i = 0; i < rep->maxfield; i++) { + /* Ignore if report count is out of bounds. */ + if (rep->field[i]->report_count < 1) + continue; + + for (j = 0; j < rep->field[i]->maxusage; j++) { + usage = &rep->field[i]->usage[j]; + if (usage->hid == HID_GD_RESOLUTION_MULTIPLIER) + hid_apply_multiplier(hid, + rep->field[i]); + } + } + } +} +EXPORT_SYMBOL_GPL(hid_setup_resolution_multiplier); + +/** + * hid_open_report - open a driver-specific device report + * + * @device: hid device + * + * Parse a report description into a hid_device structure. Reports are + * enumerated, fields are attached to these reports. + * 0 returned on success, otherwise nonzero error value. + * + * This function (or the equivalent hid_parse() macro) should only be + * called from probe() in drivers, before starting the device. + */ +int hid_open_report(struct hid_device *device) +{ + struct hid_parser *parser; + struct hid_item item; + unsigned int size; + __u8 *start; + __u8 *buf; + __u8 *end; + __u8 *next; + int ret; + int 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 (WARN_ON(device->status & HID_STAT_PARSED)) + return -EBUSY; + + start = device->dev_rdesc; + if (WARN_ON(!start)) + return -ENODEV; + size = device->dev_rsize; + + buf = kmemdup(start, size, GFP_KERNEL); + if (buf == NULL) + return -ENOMEM; + + if (device->driver->report_fixup) + start = device->driver->report_fixup(device, buf, &size); + else + start = buf; + + start = kmemdup(start, size, GFP_KERNEL); + kfree(buf); + if (start == NULL) + return -ENOMEM; + + device->rdesc = start; + device->rsize = size; + + parser = vzalloc(sizeof(struct hid_parser)); + if (!parser) { + ret = -ENOMEM; + goto alloc_err; + } + + parser->device = device; + + end = start + size; + + device->collection = kcalloc(HID_DEFAULT_NUM_COLLECTIONS, + sizeof(struct hid_collection), GFP_KERNEL); + if (!device->collection) { + ret = -ENOMEM; + goto err; + } + device->collection_size = HID_DEFAULT_NUM_COLLECTIONS; + for (i = 0; i < HID_DEFAULT_NUM_COLLECTIONS; i++) + device->collection[i].parent_idx = -1; + + ret = -EINVAL; + while ((next = fetch_item(start, end, &item)) != NULL) { + start = next; + + if (item.format != HID_ITEM_FORMAT_SHORT) { + hid_err(device, "unexpected long global item\n"); + goto err; + } + + if (dispatch_type[item.type](parser, &item)) { + hid_err(device, "item %u %u %u %u parsing failed\n", + item.format, (unsigned)item.size, + (unsigned)item.type, (unsigned)item.tag); + goto err; + } + + if (start == end) { + if (parser->collection_stack_ptr) { + hid_err(device, "unbalanced collection at end of report description\n"); + goto err; + } + if (parser->local.delimiter_depth) { + hid_err(device, "unbalanced delimiter at end of report description\n"); + goto err; + } + + /* + * fetch initial values in case the device's + * default multiplier isn't the recommended 1 + */ + hid_setup_resolution_multiplier(device); + + kfree(parser->collection_stack); + vfree(parser); + device->status |= HID_STAT_PARSED; + + return 0; + } + } + + hid_err(device, "item fetching failed at offset %u/%u\n", + size - (unsigned int)(end - start), size); +err: + kfree(parser->collection_stack); +alloc_err: + vfree(parser); + hid_close_report(device); + return ret; +} +EXPORT_SYMBOL_GPL(hid_open_report); + +/* + * 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 s32 snto32(__u32 value, unsigned n) +{ + if (!value || !n) + return 0; + + if (n > 32) + n = 32; + + switch (n) { + case 8: return ((__s8)value); + case 16: return ((__s16)value); + case 32: return ((__s32)value); + } + return value & (1 << (n - 1)) ? value | (~0U << n) : value; +} + +s32 hid_snto32(__u32 value, unsigned n) +{ + return snto32(value, n); +} +EXPORT_SYMBOL_GPL(hid_snto32); + +/* + * Convert a signed 32-bit integer to a signed n-bit integer. + */ + +static 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 little endian report (bit array). + * + * Code sort-of follows HID spec: + * http://www.usb.org/developers/hidpage/HID1_11.pdf + * + * While the USB HID spec allows unlimited length bit fields in "report + * descriptors", most devices never use more than 16 bits. + * One model of UPS is claimed to report "LINEV" as a 32-bit field. + * Search linux-kernel and linux-usb-devel archives for "hid-core extract". + */ + +static u32 __extract(u8 *report, unsigned offset, int n) +{ + unsigned int idx = offset / 8; + unsigned int bit_nr = 0; + unsigned int bit_shift = offset % 8; + int bits_to_copy = 8 - bit_shift; + u32 value = 0; + u32 mask = n < 32 ? (1U << n) - 1 : ~0U; + + while (n > 0) { + value |= ((u32)report[idx] >> bit_shift) << bit_nr; + n -= bits_to_copy; + bit_nr += bits_to_copy; + bits_to_copy = 8; + bit_shift = 0; + idx++; + } + + return value & mask; +} + +u32 hid_field_extract(const struct hid_device *hid, u8 *report, + unsigned offset, unsigned n) +{ + if (n > 32) { + hid_warn_once(hid, "%s() called with n (%d) > 32! (%s)\n", + __func__, n, current->comm); + n = 32; + } + + return __extract(report, offset, n); +} +EXPORT_SYMBOL_GPL(hid_field_extract); + +/* + * "implement" : set bits in a little endian bit stream. + * Same concepts as "extract" (see comments above). + * The data mangled in the bit stream remains in little endian + * order the whole time. It make more sense to talk about + * endianness of register values by considering a register + * a "cached" copy of the little endian bit stream. + */ + +static void __implement(u8 *report, unsigned offset, int n, u32 value) +{ + unsigned int idx = offset / 8; + unsigned int bit_shift = offset % 8; + int bits_to_set = 8 - bit_shift; + + while (n - bits_to_set >= 0) { + report[idx] &= ~(0xff << bit_shift); + report[idx] |= value << bit_shift; + value >>= bits_to_set; + n -= bits_to_set; + bits_to_set = 8; + bit_shift = 0; + idx++; + } + + /* last nibble */ + if (n) { + u8 bit_mask = ((1U << n) - 1); + report[idx] &= ~(bit_mask << bit_shift); + report[idx] |= value << bit_shift; + } +} + +static void implement(const struct hid_device *hid, u8 *report, + unsigned offset, unsigned n, u32 value) +{ + if (unlikely(n > 32)) { + hid_warn(hid, "%s() called with n (%d) > 32! (%s)\n", + __func__, n, current->comm); + n = 32; + } else if (n < 32) { + u32 m = (1U << n) - 1; + + if (unlikely(value > m)) { + hid_warn(hid, + "%s() called with too large value %d (n: %d)! (%s)\n", + __func__, value, n, current->comm); + WARN_ON(1); + value &= m; + } + } + + __implement(report, offset, n, value); +} + +/* + * Search an array for a value. + */ + +static int search(__s32 *array, __s32 value, unsigned n) +{ + while (n--) { + if (*array++ == value) + return 0; + } + return -1; +} + +/** + * hid_match_report - check if driver's raw_event should be called + * + * @hid: hid device + * @report: hid report to match against + * + * compare hid->driver->report_table->report_type to report->type + */ +static int hid_match_report(struct hid_device *hid, struct hid_report *report) +{ + const struct hid_report_id *id = hid->driver->report_table; + + if (!id) /* NULL means all */ + return 1; + + for (; id->report_type != HID_TERMINATOR; id++) + if (id->report_type == HID_ANY_ID || + id->report_type == report->type) + return 1; + return 0; +} + +/** + * hid_match_usage - check if driver's event should be called + * + * @hid: hid device + * @usage: usage to match against + * + * compare hid->driver->usage_table->usage_{type,code} to + * usage->usage_{type,code} + */ +static int hid_match_usage(struct hid_device *hid, struct hid_usage *usage) +{ + const struct hid_usage_id *id = hid->driver->usage_table; + + if (!id) /* NULL means all */ + return 1; + + for (; id->usage_type != HID_ANY_ID - 1; id++) + if ((id->usage_hid == HID_ANY_ID || + id->usage_hid == usage->hid) && + (id->usage_type == HID_ANY_ID || + id->usage_type == usage->type) && + (id->usage_code == HID_ANY_ID || + id->usage_code == usage->code)) + return 1; + return 0; +} + +static void hid_process_event(struct hid_device *hid, struct hid_field *field, + struct hid_usage *usage, __s32 value, int interrupt) +{ + struct hid_driver *hdrv = hid->driver; + int ret; + + if (!list_empty(&hid->debug_list)) + hid_dump_input(hid, usage, value); + + if (hdrv && hdrv->event && hid_match_usage(hid, usage)) { + ret = hdrv->event(hid, field, usage, value); + if (ret != 0) { + if (ret < 0) + hid_err(hid, "%s's event failed with %d\n", + hdrv->name, ret); + return; + } + } + + if (hid->claimed & HID_CLAIMED_INPUT) + hidinput_hid_event(hid, field, usage, value); + if (hid->claimed & HID_CLAIMED_HIDDEV && interrupt && hid->hiddev_hid_event) + hid->hiddev_hid_event(hid, field, usage, 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, int interrupt) +{ + 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; + + value = kmalloc_array(count, sizeof(__s32), GFP_ATOMIC); + if (!value) + return; + + for (n = 0; n < count; n++) { + + value[n] = min < 0 ? + snto32(hid_field_extract(hid, data, offset + n * size, + size), size) : + hid_field_extract(hid, data, offset + n * size, size); + + /* Ignore report if ErrorRollOver */ + if (!(field->flags & HID_MAIN_ITEM_VARIABLE) && + value[n] >= min && value[n] <= max && + value[n] - min < field->maxusage && + field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1) + goto exit; + } + + for (n = 0; n < count; n++) { + + if (HID_MAIN_ITEM_VARIABLE & field->flags) { + hid_process_event(hid, field, &field->usage[n], value[n], interrupt); + continue; + } + + if (field->value[n] >= min && field->value[n] <= max + && field->value[n] - min < field->maxusage + && 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, interrupt); + + if (value[n] >= min && value[n] <= max + && value[n] - min < field->maxusage + && field->usage[value[n] - min].hid + && search(field->value, value[n], count)) + hid_process_event(hid, field, &field->usage[value[n] - min], 1, interrupt); + } + + memcpy(field->value, value, count * sizeof(__s32)); +exit: + kfree(value); +} + +/* + * Output the field into the report. + */ + +static void hid_output_field(const struct hid_device *hid, + 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(hid, data, offset + n * size, size, + s32ton(field->value[n], size)); + else /* unsigned values */ + implement(hid, data, offset + n * size, size, + field->value[n]); + } +} + +/* + * Compute the size of a report. + */ +static size_t hid_compute_report_size(struct hid_report *report) +{ + if (report->size) + return ((report->size - 1) >> 3) + 1; + + return 0; +} + +/* + * Create a report. 'data' has to be allocated using + * hid_alloc_report_buf() so that it has proper size. + */ + +void hid_output_report(struct hid_report *report, __u8 *data) +{ + unsigned n; + + if (report->id > 0) + *data++ = report->id; + + memset(data, 0, hid_compute_report_size(report)); + for (n = 0; n < report->maxfield; n++) + hid_output_field(report->device, report->field[n], data); +} +EXPORT_SYMBOL_GPL(hid_output_report); + +/* + * Allocator for buffer that is going to be passed to hid_output_report() + */ +u8 *hid_alloc_report_buf(struct hid_report *report, gfp_t flags) +{ + /* + * 7 extra bytes are necessary to achieve proper functionality + * of implement() working on 8 byte chunks + */ + + u32 len = hid_report_len(report) + 7; + + return kmalloc(len, flags); +} +EXPORT_SYMBOL_GPL(hid_alloc_report_buf); + +/* + * Set a field value. The report this field belongs to has to be + * created and transferred to the device, to set this value in the + * device. + */ + +int hid_set_field(struct hid_field *field, unsigned offset, __s32 value) +{ + unsigned size; + + if (!field) + return -1; + + size = field->report_size; + + hid_dump_input(field->report->device, field->usage + offset, value); + + if (offset >= field->report_count) { + hid_err(field->report->device, "offset (%d) exceeds report_count (%d)\n", + offset, field->report_count); + return -1; + } + if (field->logical_minimum < 0) { + if (value != snto32(s32ton(value, size), size)) { + hid_err(field->report->device, "value %d is out of range\n", value); + return -1; + } + } + field->value[offset] = value; + return 0; +} +EXPORT_SYMBOL_GPL(hid_set_field); + +static struct hid_report *hid_get_report(struct hid_report_enum *report_enum, + const u8 *data) +{ + struct hid_report *report; + unsigned int n = 0; /* Normally report number is 0 */ + + /* Device uses numbered reports, data[0] is report number */ + if (report_enum->numbered) + n = *data; + + report = report_enum->report_id_hash[n]; + if (report == NULL) + dbg_hid("undefined report_id %u received\n", n); + + return report; +} + +/* + * Implement a generic .request() callback, using .raw_request() + * DO NOT USE in hid drivers directly, but through hid_hw_request instead. + */ +int __hid_request(struct hid_device *hid, struct hid_report *report, + int reqtype) +{ + char *buf; + int ret; + u32 len; + + buf = hid_alloc_report_buf(report, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + len = hid_report_len(report); + + if (reqtype == HID_REQ_SET_REPORT) + hid_output_report(report, buf); + + ret = hid->ll_driver->raw_request(hid, report->id, buf, len, + report->type, reqtype); + if (ret < 0) { + dbg_hid("unable to complete request: %d\n", ret); + goto out; + } + + if (reqtype == HID_REQ_GET_REPORT) + hid_input_report(hid, report->type, buf, ret, 0); + + ret = 0; + +out: + kfree(buf); + return ret; +} +EXPORT_SYMBOL_GPL(__hid_request); + +int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size, + int interrupt) +{ + struct hid_report_enum *report_enum = hid->report_enum + type; + struct hid_report *report; + struct hid_driver *hdrv; + int max_buffer_size = HID_MAX_BUFFER_SIZE; + unsigned int a; + u32 rsize, csize = size; + u8 *cdata = data; + int ret = 0; + + report = hid_get_report(report_enum, data); + if (!report) + goto out; + + if (report_enum->numbered) { + cdata++; + csize--; + } + + rsize = hid_compute_report_size(report); + + if (hid->ll_driver->max_buffer_size) + max_buffer_size = hid->ll_driver->max_buffer_size; + + if (report_enum->numbered && rsize >= max_buffer_size) + rsize = max_buffer_size - 1; + else if (rsize > max_buffer_size) + rsize = max_buffer_size; + + if (csize < rsize) { + dbg_hid("report %d is too short, (%d < %d)\n", report->id, + csize, rsize); + memset(cdata + csize, 0, rsize - csize); + } + + if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_report_event) + hid->hiddev_report_event(hid, report); + if (hid->claimed & HID_CLAIMED_HIDRAW) { + ret = hidraw_report_event(hid, data, size); + if (ret) + goto out; + } + + if (hid->claimed != HID_CLAIMED_HIDRAW && report->maxfield) { + for (a = 0; a < report->maxfield; a++) + hid_input_field(hid, report->field[a], cdata, interrupt); + hdrv = hid->driver; + if (hdrv && hdrv->report) + hdrv->report(hid, report); + } + + if (hid->claimed & HID_CLAIMED_INPUT) + hidinput_report_event(hid, report); +out: + return ret; +} +EXPORT_SYMBOL_GPL(hid_report_raw_event); + +/** + * hid_input_report - report data from lower layer (usb, bt...) + * + * @hid: hid device + * @type: HID report type (HID_*_REPORT) + * @data: report contents + * @size: size of data parameter + * @interrupt: distinguish between interrupt and control transfers + * + * This is data entry for lower layers. + */ +int hid_input_report(struct hid_device *hid, int type, u8 *data, u32 size, int interrupt) +{ + struct hid_report_enum *report_enum; + struct hid_driver *hdrv; + struct hid_report *report; + int ret = 0; + + if (!hid) + return -ENODEV; + + if (down_trylock(&hid->driver_input_lock)) + return -EBUSY; + + if (!hid->driver) { + ret = -ENODEV; + goto unlock; + } + report_enum = hid->report_enum + type; + hdrv = hid->driver; + + if (!size) { + dbg_hid("empty report\n"); + ret = -1; + goto unlock; + } + + /* Avoid unnecessary overhead if debugfs is disabled */ + if (!list_empty(&hid->debug_list)) + hid_dump_report(hid, type, data, size); + + report = hid_get_report(report_enum, data); + + if (!report) { + ret = -1; + goto unlock; + } + + if (hdrv && hdrv->raw_event && hid_match_report(hid, report)) { + ret = hdrv->raw_event(hid, report, data, size); + if (ret < 0) + goto unlock; + } + + ret = hid_report_raw_event(hid, type, data, size, interrupt); + +unlock: + up(&hid->driver_input_lock); + return ret; +} +EXPORT_SYMBOL_GPL(hid_input_report); + +bool hid_match_one_id(const struct hid_device *hdev, + const struct hid_device_id *id) +{ + return (id->bus == HID_BUS_ANY || id->bus == hdev->bus) && + (id->group == HID_GROUP_ANY || id->group == hdev->group) && + (id->vendor == HID_ANY_ID || id->vendor == hdev->vendor) && + (id->product == HID_ANY_ID || id->product == hdev->product); +} + +const struct hid_device_id *hid_match_id(const struct hid_device *hdev, + const struct hid_device_id *id) +{ + for (; id->bus; id++) + if (hid_match_one_id(hdev, id)) + return id; + + return NULL; +} + +static const struct hid_device_id hid_hiddev_list[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS) }, + { HID_USB_DEVICE(USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS1) }, + { } +}; + +static bool hid_hiddev(struct hid_device *hdev) +{ + return !!hid_match_id(hdev, hid_hiddev_list); +} + + +static ssize_t +read_report_descriptor(struct file *filp, struct kobject *kobj, + struct bin_attribute *attr, + char *buf, loff_t off, size_t count) +{ + struct device *dev = kobj_to_dev(kobj); + struct hid_device *hdev = to_hid_device(dev); + + if (off >= hdev->rsize) + return 0; + + if (off + count > hdev->rsize) + count = hdev->rsize - off; + + memcpy(buf, hdev->rdesc + off, count); + + return count; +} + +static ssize_t +show_country(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hid_device *hdev = to_hid_device(dev); + + return sprintf(buf, "%02x\n", hdev->country & 0xff); +} + +static struct bin_attribute dev_bin_attr_report_desc = { + .attr = { .name = "report_descriptor", .mode = 0444 }, + .read = read_report_descriptor, + .size = HID_MAX_DESCRIPTOR_SIZE, +}; + +static const struct device_attribute dev_attr_country = { + .attr = { .name = "country", .mode = 0444 }, + .show = show_country, +}; + +int hid_connect(struct hid_device *hdev, unsigned int connect_mask) +{ + static const char *types[] = { "Device", "Pointer", "Mouse", "Device", + "Joystick", "Gamepad", "Keyboard", "Keypad", + "Multi-Axis Controller" + }; + const char *type, *bus; + char buf[64] = ""; + unsigned int i; + int len; + int ret; + + if (hdev->quirks & HID_QUIRK_HIDDEV_FORCE) + connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV); + if (hdev->quirks & HID_QUIRK_HIDINPUT_FORCE) + connect_mask |= HID_CONNECT_HIDINPUT_FORCE; + if (hdev->bus != BUS_USB) + connect_mask &= ~HID_CONNECT_HIDDEV; + if (hid_hiddev(hdev)) + connect_mask |= HID_CONNECT_HIDDEV_FORCE; + + if ((connect_mask & HID_CONNECT_HIDINPUT) && !hidinput_connect(hdev, + connect_mask & HID_CONNECT_HIDINPUT_FORCE)) + hdev->claimed |= HID_CLAIMED_INPUT; + + if ((connect_mask & HID_CONNECT_HIDDEV) && hdev->hiddev_connect && + !hdev->hiddev_connect(hdev, + connect_mask & HID_CONNECT_HIDDEV_FORCE)) + hdev->claimed |= HID_CLAIMED_HIDDEV; + if ((connect_mask & HID_CONNECT_HIDRAW) && !hidraw_connect(hdev)) + hdev->claimed |= HID_CLAIMED_HIDRAW; + + if (connect_mask & HID_CONNECT_DRIVER) + hdev->claimed |= HID_CLAIMED_DRIVER; + + /* Drivers with the ->raw_event callback set are not required to connect + * to any other listener. */ + if (!hdev->claimed && !hdev->driver->raw_event) { + hid_err(hdev, "device has no listeners, quitting\n"); + return -ENODEV; + } + + if ((hdev->claimed & HID_CLAIMED_INPUT) && + (connect_mask & HID_CONNECT_FF) && hdev->ff_init) + hdev->ff_init(hdev); + + len = 0; + if (hdev->claimed & HID_CLAIMED_INPUT) + len += sprintf(buf + len, "input"); + if (hdev->claimed & HID_CLAIMED_HIDDEV) + len += sprintf(buf + len, "%shiddev%d", len ? "," : "", + ((struct hiddev *)hdev->hiddev)->minor); + if (hdev->claimed & HID_CLAIMED_HIDRAW) + len += sprintf(buf + len, "%shidraw%d", len ? "," : "", + ((struct hidraw *)hdev->hidraw)->minor); + + type = "Device"; + for (i = 0; i < hdev->maxcollection; i++) { + struct hid_collection *col = &hdev->collection[i]; + if (col->type == HID_COLLECTION_APPLICATION && + (col->usage & HID_USAGE_PAGE) == HID_UP_GENDESK && + (col->usage & 0xffff) < ARRAY_SIZE(types)) { + type = types[col->usage & 0xffff]; + break; + } + } + + switch (hdev->bus) { + case BUS_USB: + bus = "USB"; + break; + case BUS_BLUETOOTH: + bus = "BLUETOOTH"; + break; + case BUS_I2C: + bus = "I2C"; + break; + case BUS_VIRTUAL: + bus = "VIRTUAL"; + break; + default: + bus = "<UNKNOWN>"; + } + + ret = device_create_file(&hdev->dev, &dev_attr_country); + if (ret) + hid_warn(hdev, + "can't create sysfs country code attribute err: %d\n", ret); + + hid_info(hdev, "%s: %s HID v%x.%02x %s [%s] on %s\n", + buf, bus, hdev->version >> 8, hdev->version & 0xff, + type, hdev->name, hdev->phys); + + return 0; +} +EXPORT_SYMBOL_GPL(hid_connect); + +void hid_disconnect(struct hid_device *hdev) +{ + device_remove_file(&hdev->dev, &dev_attr_country); + if (hdev->claimed & HID_CLAIMED_INPUT) + hidinput_disconnect(hdev); + if (hdev->claimed & HID_CLAIMED_HIDDEV) + hdev->hiddev_disconnect(hdev); + if (hdev->claimed & HID_CLAIMED_HIDRAW) + hidraw_disconnect(hdev); + hdev->claimed = 0; +} +EXPORT_SYMBOL_GPL(hid_disconnect); + +/** + * hid_hw_start - start underlying HW + * @hdev: hid device + * @connect_mask: which outputs to connect, see HID_CONNECT_* + * + * Call this in probe function *after* hid_parse. This will setup HW + * buffers and start the device (if not defeirred to device open). + * hid_hw_stop must be called if this was successful. + */ +int hid_hw_start(struct hid_device *hdev, unsigned int connect_mask) +{ + int error; + + error = hdev->ll_driver->start(hdev); + if (error) + return error; + + if (connect_mask) { + error = hid_connect(hdev, connect_mask); + if (error) { + hdev->ll_driver->stop(hdev); + return error; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(hid_hw_start); + +/** + * hid_hw_stop - stop underlying HW + * @hdev: hid device + * + * This is usually called from remove function or from probe when something + * failed and hid_hw_start was called already. + */ +void hid_hw_stop(struct hid_device *hdev) +{ + hid_disconnect(hdev); + hdev->ll_driver->stop(hdev); +} +EXPORT_SYMBOL_GPL(hid_hw_stop); + +/** + * hid_hw_open - signal underlying HW to start delivering events + * @hdev: hid device + * + * Tell underlying HW to start delivering events from the device. + * This function should be called sometime after successful call + * to hid_hw_start(). + */ +int hid_hw_open(struct hid_device *hdev) +{ + int ret; + + ret = mutex_lock_killable(&hdev->ll_open_lock); + if (ret) + return ret; + + if (!hdev->ll_open_count++) { + ret = hdev->ll_driver->open(hdev); + if (ret) + hdev->ll_open_count--; + } + + mutex_unlock(&hdev->ll_open_lock); + return ret; +} +EXPORT_SYMBOL_GPL(hid_hw_open); + +/** + * hid_hw_close - signal underlaying HW to stop delivering events + * + * @hdev: hid device + * + * This function indicates that we are not interested in the events + * from this device anymore. Delivery of events may or may not stop, + * depending on the number of users still outstanding. + */ +void hid_hw_close(struct hid_device *hdev) +{ + mutex_lock(&hdev->ll_open_lock); + if (!--hdev->ll_open_count) + hdev->ll_driver->close(hdev); + mutex_unlock(&hdev->ll_open_lock); +} +EXPORT_SYMBOL_GPL(hid_hw_close); + +struct hid_dynid { + struct list_head list; + struct hid_device_id id; +}; + +/** + * store_new_id - add a new HID device ID to this driver and re-probe devices + * @drv: target device driver + * @buf: buffer for scanning device ID data + * @count: input size + * + * Adds a new dynamic hid device ID to this driver, + * and causes the driver to probe for all devices again. + */ +static ssize_t new_id_store(struct device_driver *drv, const char *buf, + size_t count) +{ + struct hid_driver *hdrv = to_hid_driver(drv); + struct hid_dynid *dynid; + __u32 bus, vendor, product; + unsigned long driver_data = 0; + int ret; + + ret = sscanf(buf, "%x %x %x %lx", + &bus, &vendor, &product, &driver_data); + if (ret < 3) + return -EINVAL; + + dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); + if (!dynid) + return -ENOMEM; + + dynid->id.bus = bus; + dynid->id.group = HID_GROUP_ANY; + dynid->id.vendor = vendor; + dynid->id.product = product; + dynid->id.driver_data = driver_data; + + spin_lock(&hdrv->dyn_lock); + list_add_tail(&dynid->list, &hdrv->dyn_list); + spin_unlock(&hdrv->dyn_lock); + + ret = driver_attach(&hdrv->driver); + + return ret ? : count; +} +static DRIVER_ATTR_WO(new_id); + +static struct attribute *hid_drv_attrs[] = { + &driver_attr_new_id.attr, + NULL, +}; +ATTRIBUTE_GROUPS(hid_drv); + +static void hid_free_dynids(struct hid_driver *hdrv) +{ + struct hid_dynid *dynid, *n; + + spin_lock(&hdrv->dyn_lock); + list_for_each_entry_safe(dynid, n, &hdrv->dyn_list, list) { + list_del(&dynid->list); + kfree(dynid); + } + spin_unlock(&hdrv->dyn_lock); +} + +const struct hid_device_id *hid_match_device(struct hid_device *hdev, + struct hid_driver *hdrv) +{ + struct hid_dynid *dynid; + + spin_lock(&hdrv->dyn_lock); + list_for_each_entry(dynid, &hdrv->dyn_list, list) { + if (hid_match_one_id(hdev, &dynid->id)) { + spin_unlock(&hdrv->dyn_lock); + return &dynid->id; + } + } + spin_unlock(&hdrv->dyn_lock); + + return hid_match_id(hdev, hdrv->id_table); +} +EXPORT_SYMBOL_GPL(hid_match_device); + +static int hid_bus_match(struct device *dev, struct device_driver *drv) +{ + struct hid_driver *hdrv = to_hid_driver(drv); + struct hid_device *hdev = to_hid_device(dev); + + return hid_match_device(hdev, hdrv) != NULL; +} + +/** + * hid_compare_device_paths - check if both devices share the same path + * @hdev_a: hid device + * @hdev_b: hid device + * @separator: char to use as separator + * + * Check if two devices share the same path up to the last occurrence of + * the separator char. Both paths must exist (i.e., zero-length paths + * don't match). + */ +bool hid_compare_device_paths(struct hid_device *hdev_a, + struct hid_device *hdev_b, char separator) +{ + int n1 = strrchr(hdev_a->phys, separator) - hdev_a->phys; + int n2 = strrchr(hdev_b->phys, separator) - hdev_b->phys; + + if (n1 != n2 || n1 <= 0 || n2 <= 0) + return false; + + return !strncmp(hdev_a->phys, hdev_b->phys, n1); +} +EXPORT_SYMBOL_GPL(hid_compare_device_paths); + +static int hid_device_probe(struct device *dev) +{ + struct hid_driver *hdrv = to_hid_driver(dev->driver); + struct hid_device *hdev = to_hid_device(dev); + const struct hid_device_id *id; + int ret = 0; + + if (down_interruptible(&hdev->driver_input_lock)) { + ret = -EINTR; + goto end; + } + hdev->io_started = false; + + clear_bit(ffs(HID_STAT_REPROBED), &hdev->status); + + if (!hdev->driver) { + id = hid_match_device(hdev, hdrv); + if (id == NULL) { + ret = -ENODEV; + goto unlock; + } + + if (hdrv->match) { + if (!hdrv->match(hdev, hid_ignore_special_drivers)) { + ret = -ENODEV; + goto unlock; + } + } else { + /* + * hid-generic implements .match(), so if + * hid_ignore_special_drivers is set, we can safely + * return. + */ + if (hid_ignore_special_drivers) { + ret = -ENODEV; + goto unlock; + } + } + + /* reset the quirks that has been previously set */ + hdev->quirks = hid_lookup_quirk(hdev); + hdev->driver = hdrv; + if (hdrv->probe) { + ret = hdrv->probe(hdev, id); + } else { /* default probe */ + ret = hid_open_report(hdev); + if (!ret) + ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); + } + if (ret) { + hid_close_report(hdev); + hdev->driver = NULL; + } + } +unlock: + if (!hdev->io_started) + up(&hdev->driver_input_lock); +end: + return ret; +} + +static int hid_device_remove(struct device *dev) +{ + struct hid_device *hdev = to_hid_device(dev); + struct hid_driver *hdrv; + + down(&hdev->driver_input_lock); + hdev->io_started = false; + + hdrv = hdev->driver; + if (hdrv) { + if (hdrv->remove) + hdrv->remove(hdev); + else /* default remove */ + hid_hw_stop(hdev); + hid_close_report(hdev); + hdev->driver = NULL; + } + + if (!hdev->io_started) + up(&hdev->driver_input_lock); + + return 0; +} + +static ssize_t modalias_show(struct device *dev, struct device_attribute *a, + char *buf) +{ + struct hid_device *hdev = container_of(dev, struct hid_device, dev); + + return scnprintf(buf, PAGE_SIZE, "hid:b%04Xg%04Xv%08Xp%08X\n", + hdev->bus, hdev->group, hdev->vendor, hdev->product); +} +static DEVICE_ATTR_RO(modalias); + +static struct attribute *hid_dev_attrs[] = { + &dev_attr_modalias.attr, + NULL, +}; +static struct bin_attribute *hid_dev_bin_attrs[] = { + &dev_bin_attr_report_desc, + NULL +}; +static const struct attribute_group hid_dev_group = { + .attrs = hid_dev_attrs, + .bin_attrs = hid_dev_bin_attrs, +}; +__ATTRIBUTE_GROUPS(hid_dev); + +static int hid_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct hid_device *hdev = to_hid_device(dev); + + if (add_uevent_var(env, "HID_ID=%04X:%08X:%08X", + hdev->bus, hdev->vendor, hdev->product)) + return -ENOMEM; + + if (add_uevent_var(env, "HID_NAME=%s", hdev->name)) + return -ENOMEM; + + if (add_uevent_var(env, "HID_PHYS=%s", hdev->phys)) + return -ENOMEM; + + if (add_uevent_var(env, "HID_UNIQ=%s", hdev->uniq)) + return -ENOMEM; + + if (add_uevent_var(env, "MODALIAS=hid:b%04Xg%04Xv%08Xp%08X", + hdev->bus, hdev->group, hdev->vendor, hdev->product)) + return -ENOMEM; + + return 0; +} + +struct bus_type hid_bus_type = { + .name = "hid", + .dev_groups = hid_dev_groups, + .drv_groups = hid_drv_groups, + .match = hid_bus_match, + .probe = hid_device_probe, + .remove = hid_device_remove, + .uevent = hid_uevent, +}; +EXPORT_SYMBOL(hid_bus_type); + +int hid_add_device(struct hid_device *hdev) +{ + static atomic_t id = ATOMIC_INIT(0); + int ret; + + if (WARN_ON(hdev->status & HID_STAT_ADDED)) + return -EBUSY; + + hdev->quirks = hid_lookup_quirk(hdev); + + /* we need to kill them here, otherwise they will stay allocated to + * wait for coming driver */ + if (hid_ignore(hdev)) + return -ENODEV; + + /* + * Check for the mandatory transport channel. + */ + if (!hdev->ll_driver->raw_request) { + hid_err(hdev, "transport driver missing .raw_request()\n"); + return -EINVAL; + } + + /* + * Read the device report descriptor once and use as template + * for the driver-specific modifications. + */ + ret = hdev->ll_driver->parse(hdev); + if (ret) + return ret; + if (!hdev->dev_rdesc) + return -ENODEV; + + /* + * Scan generic devices for group information + */ + if (hid_ignore_special_drivers) { + hdev->group = HID_GROUP_GENERIC; + } else if (!hdev->group && + !(hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)) { + ret = hid_scan_report(hdev); + if (ret) + hid_warn(hdev, "bad device descriptor (%d)\n", ret); + } + + hdev->id = atomic_inc_return(&id); + + /* XXX hack, any other cleaner solution after the driver core + * is converted to allow more than 20 bytes as the device name? */ + dev_set_name(&hdev->dev, "%04X:%04X:%04X.%04X", hdev->bus, + hdev->vendor, hdev->product, hdev->id); + + hid_debug_register(hdev, dev_name(&hdev->dev)); + ret = device_add(&hdev->dev); + if (!ret) + hdev->status |= HID_STAT_ADDED; + else + hid_debug_unregister(hdev); + + return ret; +} +EXPORT_SYMBOL_GPL(hid_add_device); + +/** + * hid_allocate_device - allocate new hid device descriptor + * + * Allocate and initialize hid device, so that hid_destroy_device might be + * used to free it. + * + * New hid_device pointer is returned on success, otherwise ERR_PTR encoded + * error value. + */ +struct hid_device *hid_allocate_device(void) +{ + struct hid_device *hdev; + int ret = -ENOMEM; + + hdev = kzalloc(sizeof(*hdev), GFP_KERNEL); + if (hdev == NULL) + return ERR_PTR(ret); + + device_initialize(&hdev->dev); + hdev->dev.release = hid_device_release; + hdev->dev.bus = &hid_bus_type; + device_enable_async_suspend(&hdev->dev); + + hid_close_report(hdev); + + init_waitqueue_head(&hdev->debug_wait); + INIT_LIST_HEAD(&hdev->debug_list); + spin_lock_init(&hdev->debug_list_lock); + sema_init(&hdev->driver_input_lock, 1); + mutex_init(&hdev->ll_open_lock); + kref_init(&hdev->ref); + + return hdev; +} +EXPORT_SYMBOL_GPL(hid_allocate_device); + +static void hid_remove_device(struct hid_device *hdev) +{ + if (hdev->status & HID_STAT_ADDED) { + device_del(&hdev->dev); + hid_debug_unregister(hdev); + hdev->status &= ~HID_STAT_ADDED; + } + kfree(hdev->dev_rdesc); + hdev->dev_rdesc = NULL; + hdev->dev_rsize = 0; +} + +/** + * hid_destroy_device - free previously allocated device + * + * @hdev: hid device + * + * If you allocate hid_device through hid_allocate_device, you should ever + * free by this function. + */ +void hid_destroy_device(struct hid_device *hdev) +{ + hid_remove_device(hdev); + put_device(&hdev->dev); +} +EXPORT_SYMBOL_GPL(hid_destroy_device); + + +static int __hid_bus_reprobe_drivers(struct device *dev, void *data) +{ + struct hid_driver *hdrv = data; + struct hid_device *hdev = to_hid_device(dev); + + if (hdev->driver == hdrv && + !hdrv->match(hdev, hid_ignore_special_drivers) && + !test_and_set_bit(ffs(HID_STAT_REPROBED), &hdev->status)) + return device_reprobe(dev); + + return 0; +} + +static int __hid_bus_driver_added(struct device_driver *drv, void *data) +{ + struct hid_driver *hdrv = to_hid_driver(drv); + + if (hdrv->match) { + bus_for_each_dev(&hid_bus_type, NULL, hdrv, + __hid_bus_reprobe_drivers); + } + + return 0; +} + +static int __bus_removed_driver(struct device_driver *drv, void *data) +{ + return bus_rescan_devices(&hid_bus_type); +} + +int __hid_register_driver(struct hid_driver *hdrv, struct module *owner, + const char *mod_name) +{ + int ret; + + hdrv->driver.name = hdrv->name; + hdrv->driver.bus = &hid_bus_type; + hdrv->driver.owner = owner; + hdrv->driver.mod_name = mod_name; + + INIT_LIST_HEAD(&hdrv->dyn_list); + spin_lock_init(&hdrv->dyn_lock); + + ret = driver_register(&hdrv->driver); + + if (ret == 0) + bus_for_each_drv(&hid_bus_type, NULL, NULL, + __hid_bus_driver_added); + + return ret; +} +EXPORT_SYMBOL_GPL(__hid_register_driver); + +void hid_unregister_driver(struct hid_driver *hdrv) +{ + driver_unregister(&hdrv->driver); + hid_free_dynids(hdrv); + + bus_for_each_drv(&hid_bus_type, NULL, hdrv, __bus_removed_driver); +} +EXPORT_SYMBOL_GPL(hid_unregister_driver); + +int hid_check_keys_pressed(struct hid_device *hid) +{ + struct hid_input *hidinput; + int i; + + if (!(hid->claimed & HID_CLAIMED_INPUT)) + return 0; + + list_for_each_entry(hidinput, &hid->inputs, list) { + for (i = 0; i < BITS_TO_LONGS(KEY_MAX); i++) + if (hidinput->input->key[i]) + return 1; + } + + return 0; +} + +EXPORT_SYMBOL_GPL(hid_check_keys_pressed); + +static int __init hid_init(void) +{ + int ret; + + if (hid_debug) + pr_warn("hid_debug is now used solely for parser and driver debugging.\n" + "debugfs is now used for inspecting the device (report descriptor, reports)\n"); + + ret = bus_register(&hid_bus_type); + if (ret) { + pr_err("can't register hid bus\n"); + goto err; + } + + ret = hidraw_init(); + if (ret) + goto err_bus; + + hid_debug_init(); + + return 0; +err_bus: + bus_unregister(&hid_bus_type); +err: + return ret; +} + +static void __exit hid_exit(void) +{ + hid_debug_exit(); + hidraw_exit(); + bus_unregister(&hid_bus_type); + hid_quirks_exit(HID_BUS_ANY); +} + +module_init(hid_init); +module_exit(hid_exit); + +MODULE_AUTHOR("Andreas Gal"); +MODULE_AUTHOR("Vojtech Pavlik"); +MODULE_AUTHOR("Jiri Kosina"); +MODULE_LICENSE("GPL"); |