From bbec1bd0faa211a0a0abaf947cd4a236d080ad28 Mon Sep 17 00:00:00 2001 From: Simon Wood Date: Mon, 2 Nov 2015 07:56:51 -0700 Subject: [PATCH] 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: Simon Wood Signed-off-by: Jiri Kosina --- drivers/hid/hid-lg4ff.c | 70 ++++++++++++++++++++----------------------------- 1 file changed, 28 insertions(+), 42 deletions(-) diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c index 02cec83..b363d88 100644 --- a/drivers/hid/hid-lg4ff.c +++ b/drivers/hid/hid-lg4ff.c @@ -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, - &lg4ff_g27_ident_info, - &lg4ff_g25_ident_info, - &lg4ff_dfp_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 }; /* 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 */ - break; - default: - return 0; + /* 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; } - 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; } -- 2.7.4