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-rw-r--r--drivers/hid/hid-core.c112
-rw-r--r--include/linux/hid.h14
2 files changed, 94 insertions, 32 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 4da66b4b977..9ed4ff37dc2 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -546,12 +546,11 @@ static void hid_free_report(struct hid_report *report)
}
/*
- * Free a device structure, all reports, and all fields.
+ * Close report. This function returns the device
+ * state to the point prior to hid_open_report().
*/
-
-static void hid_device_release(struct device *dev)
+static void hid_close_report(struct hid_device *device)
{
- struct hid_device *device = container_of(dev, struct hid_device, dev);
unsigned i, j;
for (i = 0; i < HID_REPORT_TYPES; i++) {
@@ -562,11 +561,34 @@ static void hid_device_release(struct device *dev)
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);
- kfree(device);
+ 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.
+ */
+
+static void hid_device_release(struct device *dev)
+{
+ struct hid_device *hid = container_of(dev, struct hid_device, dev);
+
+ hid_close_report(hid);
+ kfree(hid->dev_rdesc);
+ kfree(hid);
}
/*
@@ -643,15 +665,37 @@ static u8 *fetch_item(__u8 *start, __u8 *end, struct hid_item *item)
* @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);
+
+/**
+ * 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_parse_report(struct hid_device *device, __u8 *start,
- unsigned size)
+int hid_open_report(struct hid_device *device)
{
struct hid_parser *parser;
struct hid_item item;
+ unsigned int size;
+ __u8 *start;
__u8 *end;
int ret;
static int (*dispatch_type[])(struct hid_parser *parser,
@@ -662,6 +706,14 @@ int hid_parse_report(struct hid_device *device, __u8 *start,
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;
+
if (device->driver->report_fixup)
start = device->driver->report_fixup(device, start, &size);
@@ -679,6 +731,15 @@ int hid_parse_report(struct hid_device *device, __u8 *start,
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;
+
ret = -EINVAL;
while ((start = fetch_item(start, end, &item)) != NULL) {
@@ -704,6 +765,7 @@ int hid_parse_report(struct hid_device *device, __u8 *start,
goto err;
}
vfree(parser);
+ device->status |= HID_STAT_PARSED;
return 0;
}
}
@@ -711,9 +773,10 @@ int hid_parse_report(struct hid_device *device, __u8 *start,
hid_err(device, "item fetching failed at offset %d\n", (int)(end - start));
err:
vfree(parser);
+ hid_close_report(device);
return ret;
}
-EXPORT_SYMBOL_GPL(hid_parse_report);
+EXPORT_SYMBOL_GPL(hid_open_report);
/*
* Convert a signed n-bit integer to signed 32-bit integer. Common
@@ -1718,12 +1781,14 @@ static int hid_device_probe(struct device *dev)
if (hdrv->probe) {
ret = hdrv->probe(hdev, id);
} else { /* default probe */
- ret = hid_parse(hdev);
+ ret = hid_open_report(hdev);
if (!ret)
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
}
- if (ret)
+ if (ret) {
+ hid_close_report(hdev);
hdev->driver = NULL;
+ }
}
unlock:
up(&hdev->driver_lock);
@@ -1744,6 +1809,7 @@ static int hid_device_remove(struct device *dev)
hdrv->remove(hdev);
else /* default remove */
hid_hw_stop(hdev);
+ hid_close_report(hdev);
hdev->driver = NULL;
}
@@ -2075,6 +2141,16 @@ int hid_add_device(struct hid_device *hdev)
&& (hid_ignore(hdev) || (hdev->quirks & HID_QUIRK_IGNORE)))
return -ENODEV;
+ /*
+ * 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;
+
/* 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,
@@ -2103,7 +2179,6 @@ EXPORT_SYMBOL_GPL(hid_add_device);
struct hid_device *hid_allocate_device(void)
{
struct hid_device *hdev;
- unsigned int i;
int ret = -ENOMEM;
hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
@@ -2114,23 +2189,13 @@ struct hid_device *hid_allocate_device(void)
hdev->dev.release = hid_device_release;
hdev->dev.bus = &hid_bus_type;
- hdev->collection = kcalloc(HID_DEFAULT_NUM_COLLECTIONS,
- sizeof(struct hid_collection), GFP_KERNEL);
- if (hdev->collection == NULL)
- goto err;
- hdev->collection_size = HID_DEFAULT_NUM_COLLECTIONS;
-
- for (i = 0; i < HID_REPORT_TYPES; i++)
- INIT_LIST_HEAD(&hdev->report_enum[i].report_list);
+ hid_close_report(hdev);
init_waitqueue_head(&hdev->debug_wait);
INIT_LIST_HEAD(&hdev->debug_list);
sema_init(&hdev->driver_lock, 1);
return hdev;
-err:
- put_device(&hdev->dev);
- return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(hid_allocate_device);
@@ -2141,6 +2206,9 @@ static void hid_remove_device(struct hid_device *hdev)
hid_debug_unregister(hdev);
hdev->status &= ~HID_STAT_ADDED;
}
+ kfree(hdev->dev_rdesc);
+ hdev->dev_rdesc = NULL;
+ hdev->dev_rsize = 0;
}
/**
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 3a95da60fd3..d8e7cc7f894 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -467,6 +467,8 @@ struct hid_driver;
struct hid_ll_driver;
struct hid_device { /* device report descriptor */
+ __u8 *dev_rdesc;
+ unsigned dev_rsize;
__u8 *rdesc;
unsigned rsize;
struct hid_collection *collection; /* List of HID collections */
@@ -735,6 +737,7 @@ void hid_output_report(struct hid_report *report, __u8 *data);
struct hid_device *hid_allocate_device(void);
struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id);
int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size);
+int hid_open_report(struct hid_device *device);
int hid_check_keys_pressed(struct hid_device *hid);
int hid_connect(struct hid_device *hid, unsigned int connect_mask);
void hid_disconnect(struct hid_device *hid);
@@ -805,16 +808,7 @@ static inline void hid_map_usage_clear(struct hid_input *hidinput,
*/
static inline int __must_check hid_parse(struct hid_device *hdev)
{
- int ret;
-
- if (hdev->status & HID_STAT_PARSED)
- return 0;
-
- ret = hdev->ll_driver->parse(hdev);
- if (!ret)
- hdev->status |= HID_STAT_PARSED;
-
- return ret;
+ return hid_open_report(hdev);
}
/**
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-16 05:31:32 +0000