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Subject[RFC PATCH] hid-magicmouse: Map inputs rather than munging input devices
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Let the HID core handle input device setup and HID-compliant reports.
This driver then only has to worry about the non-standard reports.

Signed-off-by: Michael Poole <mdpoole@troilus.org>
---
Jiri (Slaby), is this the kind of change you had in mind for getting rid
of the input device setup for hid-magicmouse?
(This applies on top of commit a462230e16 from the magicmouse branch at
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid.git.)

drivers/hid/hid-magicmouse.c | 87
+++++++++++------------------------------
1 files changed, 24 insertions(+), 63 deletions(-)
diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index 8791a08..3778f9b 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -278,14 +278,12 @@ static int magicmouse_raw_event(struct hid_device
*hdev,
struct input_dev *input = msc->input;
int x = 0, y = 0, ii, clicks = 0, npoints;

+ /* Slightly paranoid, but "input" only gets set when our
+ * input_mapping sees the right field. */
+ if (!input)
+ return 0;
+
switch (data[0]) {
- case 0x10:
- if (size != 6)
- return 0;
- x = (__s16)(data[2] | data[3] << 8);
- y = (__s16)(data[4] | data[5] << 8);
- clicks = data[1];
- break;
case TRACKPAD_REPORT_ID:
/* Expect four bytes of prefix, and N*9 bytes of touch data. */
if (size < 4 || ((size - 4) % 9) != 0)
@@ -343,13 +341,6 @@ static int magicmouse_raw_event(struct hid_device
*hdev,
magicmouse_raw_event(hdev, report, data + 2 + data[1],
size - 2 - data[1]);
break;
- case 0x20: /* Theoretically battery status (0-100), but I have
- * never seen it -- maybe it is only upon request.
- */
- case 0x60: /* Unknown, maybe laser on/off. */
- case 0x61: /* Laser reflection status change.
- * data[1]: 0 = spotted, 1 = lost
- */
default:
return 0;
}
@@ -377,36 +368,8 @@ static int magicmouse_raw_event(struct hid_device
*hdev,
return 1;
}

-static int magicmouse_input_open(struct input_dev *dev)
-{
- struct hid_device *hid = input_get_drvdata(dev);
-
- return hid->ll_driver->open(hid);
-}
-
-static void magicmouse_input_close(struct input_dev *dev)
-{
- struct hid_device *hid = input_get_drvdata(dev);
-
- hid->ll_driver->close(hid);
-}
-
static void magicmouse_setup_input(struct input_dev *input, struct
hid_device *hdev)
{
- input_set_drvdata(input, hdev);
- input->event = hdev->ll_driver->hidinput_input_event;
- input->open = magicmouse_input_open;
- input->close = magicmouse_input_close;
-
- input->name = hdev->name;
- input->phys = hdev->phys;
- input->uniq = hdev->uniq;
- input->id.bustype = hdev->bus;
- input->id.vendor = hdev->vendor;
- input->id.product = hdev->product;
- input->id.version = hdev->version;
- input->dev.parent = hdev->dev.parent;
-
__set_bit(EV_KEY, input->evbit);

if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
@@ -466,11 +429,22 @@ static void magicmouse_setup_input(struct
input_dev *input, struct hid_device *h
}
}

+static int magicmouse_input_mapping(struct hid_device *hdev,
+ struct hid_input *hi, struct hid_field *field,
+ struct hid_usage *usage, unsigned long **bit, int *max)
+{
+ struct magicmouse_sc *msc = hid_get_drvdata(hdev);
+
+ if (!msc->input)
+ msc->input = hi->input;
+
+ return 0;
+}
+
static int magicmouse_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
__u8 feature[] = { 0xd7, 0x01 };
- struct input_dev *input;
struct magicmouse_sc *msc;
struct hid_report *report;
int ret;
@@ -500,8 +474,12 @@ static int magicmouse_probe(struct hid_device
*hdev,
goto err_free;
}

- /* we are handling the input ourselves */
- hidinput_disconnect(hdev);
+ /* We do this after HID maps its inputs so that the
+ * Magic Mouse's HID-compliant report gets the right
+ * button and axis IDs.
+ */
+ if (msc->input)
+ magicmouse_setup_input(msc->input, hdev);

if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
report = hid_register_report(hdev, HID_INPUT_REPORT,
@@ -528,24 +506,7 @@ static int magicmouse_probe(struct hid_device
*hdev,
goto err_stop_hw;
}

- input = input_allocate_device();
- if (!input) {
- dev_err(&hdev->dev, "can't alloc input device\n");
- ret = -ENOMEM;
- goto err_stop_hw;
- }
- magicmouse_setup_input(input, hdev);
-
- ret = input_register_device(input);
- if (ret) {
- dev_err(&hdev->dev, "input device registration failed\n");
- goto err_input;
- }
- msc->input = input;
-
return 0;
-err_input:
- input_free_device(input);
err_stop_hw:
hid_hw_stop(hdev);
err_free:
@@ -558,7 +519,6 @@ static void magicmouse_remove(struct hid_device
*hdev)
struct magicmouse_sc *msc = hid_get_drvdata(hdev);

hid_hw_stop(hdev);
- input_unregister_device(msc->input);
kfree(msc);
}

@@ -577,6 +537,7 @@ static struct hid_driver magicmouse_driver = {
.probe = magicmouse_probe,
.remove = magicmouse_remove,
.raw_event = magicmouse_raw_event,
+ .input_mapping = magicmouse_input_mapping,
};

static int __init magicmouse_init(void)
--
1.7.2.2




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