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HID: elecom: rewrite report based on model specific parameters 

The report descriptor for EX-G wireless mouse (M-XGL20DLBK) is a bit
different from that for trackball mice such as DEFT. For such mouse, the
current `mouse_button_fixup` cannot be used as is, because it uses
hard-coded indices for a report descriptor.

Add parameters to `mouse_button_fixup` function, in order to support
fixing report descriptors for more models.

Signed-off-by: YOSHIOKA Takuma <lo48576@hard-wi.red>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
YOSHIOKA Takuma 2020-11-22 05:54:37 +09:00 committed by Jiri Kosina
parent d5530d82ef
commit 68d09380a6
1 changed files with 29 additions and 12 deletions
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41
drivers/hid/hid-elecom.c
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@ -11,6 +11,7 @@
* Copyright (c) 2017 Diego Elio Pettenò <flameeyes@flameeyes.eu>
* Copyright (c) 2017 Alex Manoussakis <amanou@gnu.org>
* Copyright (c) 2017 Tomasz Kramkowski <tk@the-tk.com>
* Copyright (c) 2020 YOSHIOKA Takuma <lo48576@hard-wi.red>
*/
/*
@ -29,25 +30,26 @@
* report descriptor but it does not appear that these enable software to
* control what the extra buttons map to. The only simple and straightforward
* solution seems to involve fixing up the report descriptor.
*
* Report descriptor format:
* Positions 13, 15, 21 and 31 store the button bit count, button usage minimum,
* button usage maximum and padding bit count respectively.
*/
#define MOUSE_BUTTONS_MAX 8
static void mouse_button_fixup(struct hid_device *hdev,
__u8 *rdesc, unsigned int rsize,
unsigned int button_bit_count,
unsigned int padding_bit,
unsigned int button_report_size,
unsigned int button_usage_maximum,
int nbuttons)
{
if (rsize < 32 || rdesc[12] != 0x95 ||
rdesc[14] != 0x75 || rdesc[15] != 0x01 ||
rdesc[20] != 0x29 || rdesc[30] != 0x75)
if (rsize < 32 || rdesc[button_bit_count] != 0x95 ||
rdesc[button_report_size] != 0x75 ||
rdesc[button_report_size + 1] != 0x01 ||
rdesc[button_usage_maximum] != 0x29 || rdesc[padding_bit] != 0x75)
return;
hid_info(hdev, "Fixing up Elecom mouse button count\n");
nbuttons = clamp(nbuttons, 0, MOUSE_BUTTONS_MAX);
rdesc[13] = nbuttons;
rdesc[21] = nbuttons;
rdesc[31] = MOUSE_BUTTONS_MAX - nbuttons;
rdesc[button_bit_count + 1] = nbuttons;
rdesc[button_usage_maximum + 1] = nbuttons;
rdesc[padding_bit + 1] = MOUSE_BUTTONS_MAX - nbuttons;
}
static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc,
@ -65,13 +67,28 @@ static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc,
case USB_DEVICE_ID_ELECOM_M_XT3URBK:
case USB_DEVICE_ID_ELECOM_M_XT3DRBK:
case USB_DEVICE_ID_ELECOM_M_XT4DRBK:
mouse_button_fixup(hdev, rdesc, *rsize, 6);
/*
* Report descriptor format:
* 12: button bit count
* 30: padding bit count
* 14: button report size
* 20: button usage maximum
*/
mouse_button_fixup(hdev, rdesc, *rsize, 12, 30, 14, 20, 6);
break;
case USB_DEVICE_ID_ELECOM_M_DT1URBK:
case USB_DEVICE_ID_ELECOM_M_DT1DRBK:
case USB_DEVICE_ID_ELECOM_M_HT1URBK:
case USB_DEVICE_ID_ELECOM_M_HT1DRBK:
mouse_button_fixup(hdev, rdesc, *rsize, 8);
/*mouse_button_fixup(hdev, rdesc, *rsize, 13, 15, 21, 31, 8);*/
/*
* Report descriptor format:
* 12: button bit count
* 30: padding bit count
* 14: button report size
* 20: button usage maximum
*/
mouse_button_fixup(hdev, rdesc, *rsize, 12, 30, 14, 20, 8);
break;
}
return rdesc;