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Commit bbec1bd0 authored by Simon Wood's avatar Simon Wood Committed by Jiri Kosina
Browse files

HID: logitech: Simplify wheel detection scheme 



Simplfy how hid-logitech driver detects the native mode of the wheel,
done by looking at the USB-ID revision and comparing bit mask.

Signed-off-by: default avatarSimon Wood <simon@mungewell.org>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 90cdd986

drivers/hid/hid-lg4ff.c

+28 −42
Original line number Diff line number Diff line
@@ -114,16 +114,12 @@ struct lg4ff_compat_mode_switch { 
};



struct lg4ff_wheel_ident_info {

	const u32 modes;

	const u16 mask;

	const u16 result;

	const u16 real_product_id;

};



struct lg4ff_wheel_ident_checklist {

	const u32 count;

	const struct lg4ff_wheel_ident_info *models[];

};



struct lg4ff_multimode_wheel {

	const u16 product_id;

	const u32 alternate_modes;
@@ -174,36 +170,39 @@ static const struct lg4ff_alternate_mode lg4ff_alternate_modes[] = { 


/* Multimode wheel identificators */

static const struct lg4ff_wheel_ident_info lg4ff_dfp_ident_info = {

	LG4FF_MODE_DFP | LG4FF_MODE_DFEX,

	0xf000,

	0x1000,

	USB_DEVICE_ID_LOGITECH_DFP_WHEEL

};



static const struct lg4ff_wheel_ident_info lg4ff_g25_ident_info = {

	LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,

	0xff00,

	0x1200,

	USB_DEVICE_ID_LOGITECH_G25_WHEEL

};



static const struct lg4ff_wheel_ident_info lg4ff_g27_ident_info = {

	LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,

	0xfff0,

	0x1230,

	USB_DEVICE_ID_LOGITECH_G27_WHEEL

};



static const struct lg4ff_wheel_ident_info lg4ff_dfgt_ident_info = {

	LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,

	0xff00,

	0x1300,

	USB_DEVICE_ID_LOGITECH_DFGT_WHEEL

};



/* Multimode wheel identification checklists */

static const struct lg4ff_wheel_ident_checklist lg4ff_main_checklist = {

	4,

	{&lg4ff_dfgt_ident_info,

static const struct lg4ff_wheel_ident_info *lg4ff_main_checklist[] = {

	&lg4ff_dfgt_ident_info,

	&lg4ff_g27_ident_info,

	&lg4ff_g25_ident_info,

	 &lg4ff_dfp_ident_info}

	&lg4ff_dfp_ident_info

};



/* Compatibility mode switching commands */
@@ -1037,41 +1036,28 @@ static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cde 


static u16 lg4ff_identify_multimode_wheel(struct hid_device *hid, const u16 reported_product_id, const u16 bcdDevice)

{

	const struct lg4ff_wheel_ident_checklist *checklist;

	int i, from_idx, to_idx;

	u32 current_mode;

	int i;



	switch (reported_product_id) {

	case USB_DEVICE_ID_LOGITECH_WHEEL:

	case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:

		checklist = &lg4ff_main_checklist;

		from_idx = 0;

		to_idx = checklist->count - 1;

		break;

	case USB_DEVICE_ID_LOGITECH_G25_WHEEL:

		checklist = &lg4ff_main_checklist;

		from_idx = 0;

		to_idx = checklist->count - 2; /* End identity check at G25 */

		break;

	case USB_DEVICE_ID_LOGITECH_G27_WHEEL:

		checklist = &lg4ff_main_checklist;

		from_idx = 1; /* Start identity check at G27 */

		to_idx = checklist->count - 3; /* End identity check at G27 */

		break;

	case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:

		checklist = &lg4ff_main_checklist;

		from_idx = 0;

		to_idx = checklist->count - 4; /* End identity check at DFGT */

	/* identify current mode from USB PID */

	for (i = 1; i < ARRAY_SIZE(lg4ff_alternate_modes); i++) {

		dbg_hid("Testing whether PID is %X\n", lg4ff_alternate_modes[i].product_id);

		if (reported_product_id == lg4ff_alternate_modes[i].product_id)

			break;

	default:

		return 0;

	}



	for (i = from_idx; i <= to_idx; i++) {

		const u16 mask = checklist->models[i]->mask;

		const u16 result = checklist->models[i]->result;

		const u16 real_product_id = checklist->models[i]->real_product_id;

	if (i == ARRAY_SIZE(lg4ff_alternate_modes))

		return 0;



	current_mode = BIT(i);



	for (i = 0; i < ARRAY_SIZE(lg4ff_main_checklist); i++) {

		const u16 mask = lg4ff_main_checklist[i]->mask;

		const u16 result = lg4ff_main_checklist[i]->result;

		const u16 real_product_id = lg4ff_main_checklist[i]->real_product_id;



		if ((bcdDevice & mask) == result) {

		if ((current_mode & lg4ff_main_checklist[i]->modes) && \

				(bcdDevice & mask) == result) {

			dbg_hid("Found wheel with real PID %X whose reported PID is %X\n", real_product_id, reported_product_id);

			return real_product_id;

		}