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HID: hid-lg4ff: Allow switching of Logitech gaming wheels between compatibility modes
Allow switching of Logitech gaming wheels between available compatibility modes through sysfs. This only applies to multimode wheels. Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net> Tested-by: Simon Wood <simon@mungewell.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Michal Malý
Jiri Kosina
parent
a54dc7795e
commit
f31a2de3fe
@ -15,7 +15,32 @@ Description: Displays a set of alternate modes supported by a wheel. Each
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Tag: Mode Name
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Currently active mode is marked with an asterisk. List also
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contains an abstract item "native" which always denotes the
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native mode of the wheel.
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native mode of the wheel. Echoing the mode tag switches the
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wheel into the corresponding mode. Depending on the exact model
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of the wheel not all listed modes might always be selectable.
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If a wheel cannot be switched into the desired mode, -EINVAL
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is returned accompanied with an explanatory message in the
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kernel log.
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This entry is not created for devices that have only one mode.
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Currently supported mode switches:
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Driving Force Pro:
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DF-EX --> DFP
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G25:
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DF-EX --> DFP --> G25
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G27:
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DF-EX <*> DFP <-> G25 <-> G27
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DF-EX <*--------> G25 <-> G27
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DF-EX <*----------------> G27
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DFGT:
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DF-EX <*> DFP <-> DFGT
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DF-EX <*--------> DFGT
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* hid_logitech module must be loaded with lg4ff_no_autoswitch=1
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parameter set in order for the switch to DF-EX mode to work.
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What: /sys/bus/hid/drivers/logitech/<dev>/real_id
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Date: Feb 2015
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@ -201,28 +201,49 @@ static const struct lg4ff_wheel_ident_checklist lg4ff_main_checklist = {
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};
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/* Compatibility mode switching commands */
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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_dfp = {
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/* EXT_CMD9 - Understood by G27 and DFGT */
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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfex = {
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2,
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{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* Revert mode upon USB reset */
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0xf8, 0x09, 0x00, 0x01, 0x00, 0x00, 0x00} /* Switch mode to DF-EX with detach */
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};
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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfp = {
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2,
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{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* Revert mode upon USB reset */
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0xf8, 0x09, 0x01, 0x01, 0x00, 0x00, 0x00} /* Switch mode to DFP with detach */
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};
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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g25 = {
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2,
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{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* Revert mode upon USB reset */
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0xf8, 0x09, 0x02, 0x01, 0x00, 0x00, 0x00} /* Switch mode to G25 with detach */
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};
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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfgt = {
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2,
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{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* Revert mode upon USB reset */
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0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00} /* Switch mode to DFGT with detach */
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};
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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g27 = {
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2,
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{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* Revert mode upon USB reset */
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0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00} /* Switch mode to G27 with detach */
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};
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/* EXT_CMD1 - Understood by DFP, G25, G27 and DFGT */
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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext01_dfp = {
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1,
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{0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
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};
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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_dfgt = {
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2,
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{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* 1st command */
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0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00} /* 2nd command */
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};
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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_g25 = {
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/* EXT_CMD16 - Understood by G25 and G27 */
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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext16_g25 = {
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1,
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{0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
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};
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static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_g27 = {
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2,
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{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* 1st command */
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0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00} /* 2nd command */
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};
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/* Recalculates X axis value accordingly to currently selected range */
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static __s32 lg4ff_adjust_dfp_x_axis(__s32 value, __u16 range)
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{
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@ -489,6 +510,63 @@ static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
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hid_hw_request(hid, report, HID_REQ_SET_REPORT);
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}
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static const struct lg4ff_compat_mode_switch *lg4ff_get_mode_switch_command(const u16 real_product_id, const u16 target_product_id)
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{
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switch (real_product_id) {
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case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
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switch (target_product_id) {
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case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
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return &lg4ff_mode_switch_ext01_dfp;
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/* DFP can only be switched to its native mode */
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default:
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return NULL;
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}
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break;
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case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
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switch (target_product_id) {
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case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
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return &lg4ff_mode_switch_ext01_dfp;
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case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
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return &lg4ff_mode_switch_ext16_g25;
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/* G25 can only be switched to DFP mode or its native mode */
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default:
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return NULL;
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}
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break;
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case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
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switch (target_product_id) {
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case USB_DEVICE_ID_LOGITECH_WHEEL:
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return &lg4ff_mode_switch_ext09_dfex;
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case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
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return &lg4ff_mode_switch_ext09_dfp;
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case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
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return &lg4ff_mode_switch_ext09_g25;
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case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
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return &lg4ff_mode_switch_ext09_g27;
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/* G27 can only be switched to DF-EX, DFP, G25 or its native mode */
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default:
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return NULL;
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}
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break;
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case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
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switch (target_product_id) {
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case USB_DEVICE_ID_LOGITECH_WHEEL:
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return &lg4ff_mode_switch_ext09_dfex;
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case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
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return &lg4ff_mode_switch_ext09_dfp;
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case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
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return &lg4ff_mode_switch_ext09_dfgt;
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/* DFGT can only be switched to DF-EX, DFP or its native mode */
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default:
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return NULL;
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}
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break;
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/* No other wheels have multiple modes */
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default:
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return NULL;
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}
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}
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static int lg4ff_switch_compatibility_mode(struct hid_device *hid, const struct lg4ff_compat_mode_switch *s)
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{
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struct usb_device *usbdev = hid_to_usb_dev(hid);
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@ -558,7 +636,87 @@ static ssize_t lg4ff_alternate_modes_show(struct device *dev, struct device_attr
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static ssize_t lg4ff_alternate_modes_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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return -ENOSYS;
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struct hid_device *hid = to_hid_device(dev);
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struct lg4ff_device_entry *entry;
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struct lg_drv_data *drv_data;
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const struct lg4ff_compat_mode_switch *s;
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u16 target_product_id = 0;
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int i, ret;
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char *lbuf;
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drv_data = hid_get_drvdata(hid);
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if (!drv_data) {
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hid_err(hid, "Private driver data not found!\n");
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return -EINVAL;
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}
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entry = drv_data->device_props;
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if (!entry) {
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hid_err(hid, "Device properties not found!\n");
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return -EINVAL;
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}
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/* Allow \n at the end of the input parameter */
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lbuf = kasprintf(GFP_KERNEL, "%s", buf);
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if (!lbuf)
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return -ENOMEM;
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i = strlen(lbuf);
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if (lbuf[i-1] == '\n') {
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if (i == 1) {
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kfree(lbuf);
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return -EINVAL;
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}
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lbuf[i-1] = '\0';
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}
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for (i = 0; i < LG4FF_MODE_MAX_IDX; i++) {
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const u16 mode_product_id = lg4ff_alternate_modes[i].product_id;
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const char *tag = lg4ff_alternate_modes[i].tag;
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if (entry->alternate_modes & BIT(i)) {
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if (!strcmp(tag, lbuf)) {
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if (!mode_product_id)
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target_product_id = entry->real_product_id;
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else
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target_product_id = mode_product_id;
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break;
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}
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}
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}
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if (i == LG4FF_MODE_MAX_IDX) {
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hid_info(hid, "Requested mode \"%s\" is not supported by the device\n", lbuf);
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kfree(lbuf);
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return -EINVAL;
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}
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kfree(lbuf); /* Not needed anymore */
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if (target_product_id == entry->product_id) /* Nothing to do */
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return count;
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/* Automatic switching has to be disabled for the switch to DF-EX mode to work correctly */
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if (target_product_id == USB_DEVICE_ID_LOGITECH_WHEEL && !lg4ff_no_autoswitch) {
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hid_info(hid, "\"%s\" cannot be switched to \"DF-EX\" mode. Load the \"hid_logitech\" module with \"lg4ff_no_autoswitch=1\" parameter set and try again\n",
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entry->real_name);
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return -EINVAL;
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}
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/* Take care of hardware limitations */
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if ((entry->real_product_id == USB_DEVICE_ID_LOGITECH_DFP_WHEEL || entry->real_product_id == USB_DEVICE_ID_LOGITECH_G25_WHEEL) &&
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entry->product_id > target_product_id) {
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hid_info(hid, "\"%s\" cannot be switched back into \"%s\" mode\n", entry->real_name, lg4ff_alternate_modes[i].name);
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return -EINVAL;
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}
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s = lg4ff_get_mode_switch_command(entry->real_product_id, target_product_id);
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if (!s) {
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hid_err(hid, "Invalid target product ID %X\n", target_product_id);
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return -EINVAL;
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}
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ret = lg4ff_switch_compatibility_mode(hid, s);
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return (ret == 0 ? count : ret);
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}
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static DEVICE_ATTR(alternate_modes, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_alternate_modes_show, lg4ff_alternate_modes_store);
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@ -783,7 +941,8 @@ static u16 lg4ff_identify_multimode_wheel(struct hid_device *hid, const u16 repo
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}
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}
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/* No match found. This is an unknown wheel model, do not touch it */
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/* No match found. This is either Driving Force or an unknown
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* wheel model, do not touch it */
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dbg_hid("Wheel with bcdDevice %X was not recognized as multimode wheel, leaving in its current mode\n", bcdDevice);
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return 0;
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}
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@ -806,22 +965,9 @@ static int lg4ff_handle_multimode_wheel(struct hid_device *hid, u16 *real_produc
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if (reported_product_id == USB_DEVICE_ID_LOGITECH_WHEEL &&
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reported_product_id != *real_product_id &&
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!lg4ff_no_autoswitch) {
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const struct lg4ff_compat_mode_switch *s;
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const struct lg4ff_compat_mode_switch *s = lg4ff_get_mode_switch_command(*real_product_id, *real_product_id);
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switch (*real_product_id) {
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case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
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s = &lg4ff_mode_switch_dfp;
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break;
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case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
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s = &lg4ff_mode_switch_g25;
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break;
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case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
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s = &lg4ff_mode_switch_g27;
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break;
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case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
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s = &lg4ff_mode_switch_dfgt;
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break;
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default:
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if (!s) {
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hid_err(hid, "Invalid product id %X\n", *real_product_id);
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return LG4FF_MMODE_NOT_MULTIMODE;
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}
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