linux-kernel - Re: [PATCH 06/10] HID: move logitech report quirks

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Date:	Mon, 09 Jun 2008 12:33:50 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, marcel@...tmann.org,
	linux-kernel@...r.kernel.org, anssi.hannula@...il.com
Subject: Re: [PATCH 06/10] HID: move logitech report quirks

On 06/04/2008 03:21 PM, Jiri Kosina wrote:
> On Fri, 16 May 2008, Jiri Slaby wrote:
> 
>>  static const struct hid_device_id hid_blacklist[] = {
>> +	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_MX3000_RECEIVER) },
>> +	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER) },
>> +	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER_2) },
>>  	{ }
>>  };
> 
> This shouldn't be needed as soon as the userspace supports the proper 
> module autoloading, right?

This is needed to tell generic drivers not to bind these, its' generic 
blacklist. I have no idea how this could be done better with current drivers/base/.

>> +#define LOGITECH_RDESC	0x1
>> +
>> +/*
>> + * Certain Logitech keyboards send in report #3 keys which are far
>> + * above the logical maximum described in descriptor. This extends
>> + * the original value of 0x28c of logical maximum to 0x104d
>> + */
>> +static void lg_report_fixup(struct hid_device *hdev, __u8 *rdesc,
>> +		unsigned int rsize)
>> +{
>> +	if (rsize >= 90 && rdesc[83] == 0x26
>> +			&& rdesc[84] == 0x8c
>> +			&& rdesc[85] == 0x02) {
>> +		dev_info(&hdev->dev, "fixing up Logitech keyboard report "
>> +				"descriptor\n");
>> +		rdesc[84] = rdesc[89] = 0x4d;
>> +		rdesc[85] = rdesc[90] = 0x10;
>> +	}
>> +}
>> +
>> +static const struct hid_device_id lg_devices[] = {
>> +	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_MX3000_RECEIVER),
>> +		.driver_data = LOGITECH_RDESC },
>> +	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER),
>> +		.driver_data = LOGITECH_RDESC },
>> +	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER_2),
>> +		.driver_data = LOGITECH_RDESC },
>> +	{ }
> 
> You set the LOGITECH_RDESC flag here, but it is then never used anywhere. 
> I guess that your original intent was to check for this flag in 
> lg_report_fixup(), right?

I assumed use of these in the second round (see my previous email) :). Anyway 
they are useless now.
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