3 files changed, 174 insertions, 9 deletions

diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 413a73187d33..f3bbbce8353b 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -581,6 +581,7 @@ int __init hidraw_init(void)
         if (result < 0)
                 goto error_class;
 
+        printk(KERN_INFO "hidraw: raw HID events driver (C) Jiri Kosina\n");
 out:
         return result;
 
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index e766b5614ef5..ec7930217a6d 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -34,6 +34,7 @@
 #include <linux/kernel.h>
 #include <linux/hid.h>
 #include <linux/mutex.h>
+#include <linux/acpi.h>
 
 #include <linux/i2c/i2c-hid.h>
 
@@ -139,6 +140,8 @@ struct i2c_hid {
         unsigned long           flags;          /* device flags */
 
         wait_queue_head_t       wait;           /* For waiting the interrupt */
+
+        struct i2c_hid_platform_data pdata;
 };
 
 static int __i2c_hid_command(struct i2c_client *client,
@@ -821,6 +824,70 @@ static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
         return 0;
 }
 
+#ifdef CONFIG_ACPI
+static int i2c_hid_acpi_pdata(struct i2c_client *client,
+                struct i2c_hid_platform_data *pdata)
+{
+        static u8 i2c_hid_guid[] = {
+                0xF7, 0xF6, 0xDF, 0x3C, 0x67, 0x42, 0x55, 0x45,
+                0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE,
+        };
+        struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
+        union acpi_object params[4], *obj;
+        struct acpi_object_list input;
+        struct acpi_device *adev;
+        acpi_handle handle;
+
+        handle = ACPI_HANDLE(&client->dev);
+        if (!handle || acpi_bus_get_device(handle, &adev))
+                return -ENODEV;
+
+        input.count = ARRAY_SIZE(params);
+        input.pointer = params;
+
+        params[0].type = ACPI_TYPE_BUFFER;
+        params[0].buffer.length = sizeof(i2c_hid_guid);
+        params[0].buffer.pointer = i2c_hid_guid;
+        params[1].type = ACPI_TYPE_INTEGER;
+        params[1].integer.value = 1;
+        params[2].type = ACPI_TYPE_INTEGER;
+        params[2].integer.value = 1; /* HID function */
+        params[3].type = ACPI_TYPE_INTEGER;
+        params[3].integer.value = 0;
+
+        if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf))) {
+                dev_err(&client->dev, "device _DSM execution failed\n");
+                return -ENODEV;
+        }
+
+        obj = (union acpi_object *)buf.pointer;
+        if (obj->type != ACPI_TYPE_INTEGER) {
+                dev_err(&client->dev, "device _DSM returned invalid type: %d\n",
+                        obj->type);
+                kfree(buf.pointer);
+                return -EINVAL;
+        }
+
+        pdata->hid_descriptor_address = obj->integer.value;
+
+        kfree(buf.pointer);
+        return 0;
+}
+
+static const struct acpi_device_id i2c_hid_acpi_match[] = {
+        {"ACPI0C50", 0 },
+        {"PNP0C50", 0 },
+        { },
+};
+MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
+#else
+static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
+                struct i2c_hid_platform_data *pdata)
+{
+        return -ENODEV;
+}
+#endif
+
 static int i2c_hid_probe(struct i2c_client *client,
                          const struct i2c_device_id *dev_id)
 {
@@ -832,11 +899,6 @@ static int i2c_hid_probe(struct i2c_client *client,
 
         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
 
-        if (!platform_data) {
-                dev_err(&client->dev, "HID register address not provided\n");
-                return -EINVAL;
-        }
-
         if (!client->irq) {
                 dev_err(&client->dev,
                         "HID over i2c has not been provided an Int IRQ\n");
@@ -847,11 +909,22 @@ static int i2c_hid_probe(struct i2c_client *client,
         if (!ihid)
                 return -ENOMEM;
 
+        if (!platform_data) {
+                ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
+                if (ret) {
+                        dev_err(&client->dev,
+                                "HID register address not provided\n");
+                        goto err;
+                }
+        } else {
+                ihid->pdata = *platform_data;
+        }
+
         i2c_set_clientdata(client, ihid);
 
         ihid->client = client;
 
-        hidRegister = platform_data->hid_descriptor_address;
+        hidRegister = ihid->pdata.hid_descriptor_address;
         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
 
         init_waitqueue_head(&ihid->wait);
@@ -884,6 +957,7 @@ static int i2c_hid_probe(struct i2c_client *client,
         hid->hid_get_raw_report = i2c_hid_get_raw_report;
         hid->hid_output_raw_report = i2c_hid_output_raw_report;
         hid->dev.parent = &client->dev;
+        ACPI_HANDLE_SET(&hid->dev, ACPI_HANDLE(&client->dev));
         hid->bus = BUS_I2C;
         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
@@ -975,6 +1049,7 @@ static struct i2c_driver i2c_hid_driver = {
                 .name   = "i2c_hid",
                 .owner  = THIS_MODULE,
                 .pm     = &i2c_hid_pm,
+                .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
         },
 
         .probe          = i2c_hid_probe,
diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index 714cd8cc9579..fc307e0422af 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -11,6 +11,7 @@
  */
 
 #include <linux/atomic.h>
+#include <linux/compat.h>
 #include <linux/device.h>
 #include <linux/fs.h>
 #include <linux/hid.h>
@@ -276,6 +277,94 @@ static struct hid_ll_driver uhid_hid_driver = {
         .parse = uhid_hid_parse,
 };
 
+#ifdef CONFIG_COMPAT
+
+/* Apparently we haven't stepped on these rakes enough times yet. */
+struct uhid_create_req_compat {
+        __u8 name[128];
+        __u8 phys[64];
+        __u8 uniq[64];
+
+        compat_uptr_t rd_data;
+        __u16 rd_size;
+
+        __u16 bus;
+        __u32 vendor;
+        __u32 product;
+        __u32 version;
+        __u32 country;
+} __attribute__((__packed__));
+
+static int uhid_event_from_user(const char __user *buffer, size_t len,
+                                struct uhid_event *event)
+{
+        if (is_compat_task()) {
+                u32 type;
+
+                if (get_user(type, buffer))
+                        return -EFAULT;
+
+                if (type == UHID_CREATE) {
+                        /*
+                         * This is our messed up request with compat pointer.
+                         * It is largish (more than 256 bytes) so we better
+                         * allocate it from the heap.
+                         */
+                        struct uhid_create_req_compat *compat;
+
+                        compat = kmalloc(sizeof(*compat), GFP_KERNEL);
+                        if (!compat)
+                                return -ENOMEM;
+
+                        buffer += sizeof(type);
+                        len -= sizeof(type);
+                        if (copy_from_user(compat, buffer,
+                                           min(len, sizeof(*compat)))) {
+                                kfree(compat);
+                                return -EFAULT;
+                        }
+
+                        /* Shuffle the data over to proper structure */
+                        event->type = type;
+
+                        memcpy(event->u.create.name, compat->name,
+                                sizeof(compat->name));
+                        memcpy(event->u.create.phys, compat->phys,
+                                sizeof(compat->phys));
+                        memcpy(event->u.create.uniq, compat->uniq,
+                                sizeof(compat->uniq));
+
+                        event->u.create.rd_data = compat_ptr(compat->rd_data);
+                        event->u.create.rd_size = compat->rd_size;
+
+                        event->u.create.bus = compat->bus;
+                        event->u.create.vendor = compat->vendor;
+                        event->u.create.product = compat->product;
+                        event->u.create.version = compat->version;
+                        event->u.create.country = compat->country;
+
+                        kfree(compat);
+                        return 0;
+                }
+                /* All others can be copied directly */
+        }
+
+        if (copy_from_user(event, buffer, min(len, sizeof(*event))))
+                return -EFAULT;
+
+        return 0;
+}
+#else
+static int uhid_event_from_user(const char __user *buffer, size_t len,
+                                struct uhid_event *event)
+{
+        if (copy_from_user(event, buffer, min(len, sizeof(*event))))
+                return -EFAULT;
+
+        return 0;
+}
+#endif
+
 static int uhid_dev_create(struct uhid_device *uhid,
                            const struct uhid_event *ev)
 {
@@ -498,10 +587,10 @@ static ssize_t uhid_char_write(struct file *file, const char __user *buffer,
 
         memset(&uhid->input_buf, 0, sizeof(uhid->input_buf));
         len = min(count, sizeof(uhid->input_buf));
-        if (copy_from_user(&uhid->input_buf, buffer, len)) {
-                ret = -EFAULT;
+
+        ret = uhid_event_from_user(buffer, len, &uhid->input_buf);
+        if (ret)
                 goto unlock;
-        }
 
         switch (uhid->input_buf.type) {
         case UHID_CREATE: