[PATCH v2 1/2] hid: microsoft: Convert private data to be a proper struct

[Andrey Smirnov]

In order to be able to have more than just an unsigned long worth of
private data, convert the code to allocate and use a dedicated struct.

Cc: Dmitry Torokhov <dmitry.torok...@gmail.com>
Cc: Jiri Kosina <ji...@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoi...@redhat.com>
Cc: linux-in...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Pierre-Loup A. Griffais <pgriff...@valvesoftware.com>
Signed-off-by: Juha Kuikka <juha.kui...@gmail.com>
Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com>
---
 drivers/hid/hid-microsoft.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/hid/hid-microsoft.c b/drivers/hid/hid-microsoft.c
index 96e7d3231d2f..f8868d96c0c7 100644
--- a/drivers/hid/hid-microsoft.c
+++ b/drivers/hid/hid-microsoft.c
@@ -29,10 +29,15 @@
 #define MS_NOGET               0x10
 #define MS_DUPLICATE_USAGES    0x20
 
+struct ms_data {
+       unsigned long quirks;
+};
+
 static __u8 *ms_report_fixup(struct hid_device *hdev, __u8 *rdesc,
                unsigned int *rsize)
 {
-       unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
+       struct ms_data *ms = hid_get_drvdata(hdev);
+       unsigned long quirks = ms->quirks;
 
        /*
         * Microsoft Wireless Desktop Receiver (Model 1028) has
@@ -134,7 +139,8 @@ static int ms_input_mapping(struct hid_device *hdev, struct 
hid_input *hi,
                struct hid_field *field, struct hid_usage *usage,
                unsigned long **bit, int *max)
 {
-       unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
+       struct ms_data *ms = hid_get_drvdata(hdev);
+       unsigned long quirks = ms->quirks;
 
        if (quirks & MS_ERGONOMY) {
                int ret = ms_ergonomy_kb_quirk(hi, usage, bit, max);
@@ -153,7 +159,8 @@ static int ms_input_mapped(struct hid_device *hdev, struct 
hid_input *hi,
                struct hid_field *field, struct hid_usage *usage,
                unsigned long **bit, int *max)
 {
-       unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
+       struct ms_data *ms = hid_get_drvdata(hdev);
+       unsigned long quirks = ms->quirks;
 
        if (quirks & MS_DUPLICATE_USAGES)
                clear_bit(usage->code, *bit);
@@ -164,7 +171,8 @@ static int ms_input_mapped(struct hid_device *hdev, struct 
hid_input *hi,
 static int ms_event(struct hid_device *hdev, struct hid_field *field,
                struct hid_usage *usage, __s32 value)
 {
-       unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
+       struct ms_data *ms = hid_get_drvdata(hdev);
+       unsigned long quirks = ms->quirks;
        struct input_dev *input;
 
        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
@@ -222,9 +230,16 @@ static int ms_event(struct hid_device *hdev, struct 
hid_field *field,
 static int ms_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
        unsigned long quirks = id->driver_data;
+       struct ms_data *ms;
        int ret;
 
-       hid_set_drvdata(hdev, (void *)quirks);
+       ms = devm_kzalloc(&hdev->dev, sizeof(*ms), GFP_KERNEL);
+       if (ms == NULL)
+               return -ENOMEM;
+
+       ms->quirks = quirks;
+
+       hid_set_drvdata(hdev, ms);
 
        if (quirks & MS_NOGET)
                hdev->quirks |= HID_QUIRK_NOGET;
-- 
2.17.1