Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754650AbbBOCEL (ORCPT ); Sat, 14 Feb 2015 21:04:11 -0500 Received: from smtp.devoid-pointer.net ([31.31.77.140]:40496 "EHLO smtp.devoid-pointer.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754361AbbBOCEG (ORCPT ); Sat, 14 Feb 2015 21:04:06 -0500 From: =?UTF-8?q?Michal=20Mal=C3=BD?= To: jkosina@suse.cz Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, simon@mungewell.org, elias.vds@gmail.com, =?UTF-8?q?Michal=20Mal=C3=BD?= Subject: [PATCH v2 4/4] HID: hid-lg4ff: Allow switching of Logitech gaming wheels between available compatibility modes through sysfs. This only applies to multimode wheels. Date: Sun, 15 Feb 2015 03:03:05 +0100 Message-Id: <1423965785-22930-5-git-send-email-madcatxster@devoid-pointer.net> X-Mailer: git-send-email 2.3.0 In-Reply-To: <1423965785-22930-1-git-send-email-madcatxster@devoid-pointer.net> References: <1423965785-22930-1-git-send-email-madcatxster@devoid-pointer.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11137 Lines: 309 Allow switching of Logitech gaming wheels between available compatibility modes through sysfs. This only applies to multimode wheels. Signed-off-by: Michal Malý --- v2: Fix a misleading error message regarding unsupported wheel mode .../ABI/testing/sysfs-driver-hid-logitech-lg4ff | 27 ++- drivers/hid/hid-lg4ff.c | 204 ++++++++++++++++++--- 2 files changed, 201 insertions(+), 30 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-driver-hid-logitech-lg4ff b/Documentation/ABI/testing/sysfs-driver-hid-logitech-lg4ff index 3204440..b3f6a2a 100644 --- a/Documentation/ABI/testing/sysfs-driver-hid-logitech-lg4ff +++ b/Documentation/ABI/testing/sysfs-driver-hid-logitech-lg4ff @@ -15,7 +15,32 @@ Description: Displays a set of alternate modes supported by a wheel. Each Tag: Mode Name Currently active mode is marked with an asterisk. List also contains an abstract item "native" which always denotes the - native mode of the wheel. + native mode of the wheel. Echoing the mode tag switches the + wheel into the corresponding mode. Depending on the exact model + of the wheel not all listed modes might always be selectable. + If a wheel cannot be switched into the desired mode, -EINVAL + is returned accompanied with an explanatory message in the + kernel log. + This entry is not created for devices that have only one mode. + + Currently supported mode switches: + Driving Force Pro: + DF-EX --> DFP + + G25: + DF-EX --> DFP --> G25 + + G27: + DF-EX <*> DFP <-> G25 <-> G27 + DF-EX <*--------> G25 <-> G27 + DF-EX <*----------------> G27 + + DFGT: + DF-EX <*> DFP <-> DFGT + DF-EX <*--------> DFGT + + * hid_logitech module must be loaded with lg4ff_no_autoswitch=1 + parameter set in order for the switch to DF-EX mode to work. What: /sys/bus/hid/drivers/logitech//real_id Date: Feb 2015 diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c index e4b8cae..1bc4020 100644 --- a/drivers/hid/hid-lg4ff.c +++ b/drivers/hid/hid-lg4ff.c @@ -201,26 +201,47 @@ static const struct lg4ff_wheel_ident_checklist lg4ff_main_checklist = { }; /* Compatibility mode switching commands */ -static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_dfp = { - 1, - {0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00} +/* EXT_CMD9 - Understood by G27 and DFGT */ +static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfex = { + 2, + {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* Revert mode upon USB reset */ + 0xf8, 0x09, 0x00, 0x01, 0x00, 0x00, 0x00} /* Switch mode to DF-EX with detach */ }; -static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_dfgt = { +static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfp = { 2, - {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* 1st command */ - 0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00} /* 2nd command */ + {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* Revert mode upon USB reset */ + 0xf8, 0x09, 0x01, 0x01, 0x00, 0x00, 0x00} /* Switch mode to DFP with detach */ }; -static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_g25 = { - 1, - {0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00} +static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g25 = { + 2, + {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* Revert mode upon USB reset */ + 0xf8, 0x09, 0x02, 0x01, 0x00, 0x00, 0x00} /* Switch mode to G25 with detach */ }; -static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_g27 = { +static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfgt = { 2, - {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* 1st command */ - 0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00} /* 2nd command */ + {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* Revert mode upon USB reset */ + 0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00} /* Switch mode to DFGT with detach */ +}; + +static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g27 = { + 2, + {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, /* Revert mode upon USB reset */ + 0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00} /* Switch mode to G27 with detach */ +}; + +/* EXT_CMD1 - Understood by DFP, G25, G27 and DFGT */ +static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext01_dfp = { + 1, + {0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00} +}; + +/* EXT_CMD16 - Understood by G25 and G27 */ +static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext16_g25 = { + 1, + {0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00} }; /* Recalculates X axis value accordingly to currently selected range */ @@ -489,6 +510,63 @@ static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range) hid_hw_request(hid, report, HID_REQ_SET_REPORT); } +static const struct lg4ff_compat_mode_switch *lg4ff_get_mode_switch_command(const u16 real_product_id, const u16 target_product_id) +{ + switch (real_product_id) { + case USB_DEVICE_ID_LOGITECH_DFP_WHEEL: + switch (target_product_id) { + case USB_DEVICE_ID_LOGITECH_DFP_WHEEL: + return &lg4ff_mode_switch_ext01_dfp; + /* DFP can only be switched to its native mode */ + default: + return NULL; + } + break; + case USB_DEVICE_ID_LOGITECH_G25_WHEEL: + switch (target_product_id) { + case USB_DEVICE_ID_LOGITECH_DFP_WHEEL: + return &lg4ff_mode_switch_ext01_dfp; + case USB_DEVICE_ID_LOGITECH_G25_WHEEL: + return &lg4ff_mode_switch_ext16_g25; + /* G25 can only be switched to DFP mode or its native mode */ + default: + return NULL; + } + break; + case USB_DEVICE_ID_LOGITECH_G27_WHEEL: + switch (target_product_id) { + case USB_DEVICE_ID_LOGITECH_WHEEL: + return &lg4ff_mode_switch_ext09_dfex; + case USB_DEVICE_ID_LOGITECH_DFP_WHEEL: + return &lg4ff_mode_switch_ext09_dfp; + case USB_DEVICE_ID_LOGITECH_G25_WHEEL: + return &lg4ff_mode_switch_ext09_g25; + case USB_DEVICE_ID_LOGITECH_G27_WHEEL: + return &lg4ff_mode_switch_ext09_g27; + /* G27 can only be switched to DF-EX, DFP, G25 or its native mode */ + default: + return NULL; + } + break; + case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL: + switch (target_product_id) { + case USB_DEVICE_ID_LOGITECH_WHEEL: + return &lg4ff_mode_switch_ext09_dfex; + case USB_DEVICE_ID_LOGITECH_DFP_WHEEL: + return &lg4ff_mode_switch_ext09_dfp; + case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL: + return &lg4ff_mode_switch_ext09_dfgt; + /* DFGT can only be switched to DF-EX, DFP or its native mode */ + default: + return NULL; + } + break; + /* No other wheels have multiple modes */ + default: + return NULL; + } +} + static int lg4ff_switch_compatibility_mode(struct hid_device *hid, const struct lg4ff_compat_mode_switch *s) { struct usb_device *usbdev = hid_to_usb_dev(hid); @@ -558,7 +636,87 @@ static ssize_t lg4ff_alternate_modes_show(struct device *dev, struct device_attr static ssize_t lg4ff_alternate_modes_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - return -ENOSYS; + struct hid_device *hid = to_hid_device(dev); + struct lg4ff_device_entry *entry; + struct lg_drv_data *drv_data; + const struct lg4ff_compat_mode_switch *s; + u16 target_product_id = 0; + int i, ret; + char *lbuf; + + drv_data = hid_get_drvdata(hid); + if (!drv_data) { + hid_err(hid, "Private driver data not found!\n"); + return -EINVAL; + } + + entry = drv_data->device_props; + if (!entry) { + hid_err(hid, "Device properties not found!\n"); + return -EINVAL; + } + + /* Allow \n at the end of the input parameter */ + lbuf = kasprintf(GFP_KERNEL, "%s", buf); + if (!lbuf) + return -ENOMEM; + + i = strlen(lbuf); + if (lbuf[i-1] == '\n') { + if (i == 1) { + kfree(lbuf); + return -EINVAL; + } + lbuf[i-1] = '\0'; + } + + for (i = 0; i < LG4FF_MODE_MAX_IDX; i++) { + const u16 mode_product_id = lg4ff_alternate_modes[i].product_id; + const char *tag = lg4ff_alternate_modes[i].tag; + + if (entry->alternate_modes & BIT(i)) { + if (!strcmp(tag, lbuf)) { + if (!mode_product_id) + target_product_id = entry->real_product_id; + else + target_product_id = mode_product_id; + break; + } + } + } + + if (i == LG4FF_MODE_MAX_IDX) { + hid_info(hid, "Requested mode \"%s\" is not supported by the device\n", lbuf); + kfree(lbuf); + return -EINVAL; + } + kfree(lbuf); /* Not needed anymore */ + + if (target_product_id == entry->product_id) /* Nothing to do */ + return count; + + /* Automatic switching has to be disabled for the switch to DF-EX mode to work correctly */ + if (target_product_id == USB_DEVICE_ID_LOGITECH_WHEEL && !lg4ff_no_autoswitch) { + 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", + entry->real_name); + return -EINVAL; + } + + /* Take care of hardware limitations */ + if ((entry->real_product_id == USB_DEVICE_ID_LOGITECH_DFP_WHEEL || entry->real_product_id == USB_DEVICE_ID_LOGITECH_G25_WHEEL) && + entry->product_id > target_product_id) { + hid_info(hid, "\"%s\" cannot be switched back into \"%s\" mode\n", entry->real_name, lg4ff_alternate_modes[i].name); + return -EINVAL; + } + + s = lg4ff_get_mode_switch_command(entry->real_product_id, target_product_id); + if (!s) { + hid_err(hid, "Invalid target product ID %X\n", target_product_id); + return -EINVAL; + } + + ret = lg4ff_switch_compatibility_mode(hid, s); + return (ret == 0 ? count : ret); } static DEVICE_ATTR(alternate_modes, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_alternate_modes_show, lg4ff_alternate_modes_store); @@ -783,7 +941,8 @@ u16 lg4ff_identify_multimode_wheel(struct hid_device *hid, const u16 reported_pr } } - /* No match found. This is an unknown wheel model, do not touch it */ + /* No match found. This is either Driving Force or an unknown + * wheel model, do not touch it */ dbg_hid("Wheel with bcdDevice %X was not recognized as multimode wheel, leaving in its current mode\n", bcdDevice); return 0; } @@ -806,22 +965,9 @@ int lg4ff_handle_multimode_wheel(struct hid_device *hid, u16 *real_product_id, c if (reported_product_id == USB_DEVICE_ID_LOGITECH_WHEEL && reported_product_id != *real_product_id && !lg4ff_no_autoswitch) { - const struct lg4ff_compat_mode_switch *s; + const struct lg4ff_compat_mode_switch *s = lg4ff_get_mode_switch_command(*real_product_id, *real_product_id); - switch (*real_product_id) { - case USB_DEVICE_ID_LOGITECH_DFP_WHEEL: - s = &lg4ff_mode_switch_dfp; - break; - case USB_DEVICE_ID_LOGITECH_G25_WHEEL: - s = &lg4ff_mode_switch_g25; - break; - case USB_DEVICE_ID_LOGITECH_G27_WHEEL: - s = &lg4ff_mode_switch_g27; - break; - case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL: - s = &lg4ff_mode_switch_dfgt; - break; - default: + if (!s) { hid_err(hid, "Invalid product id %X\n", *real_product_id); return LG4FF_MMODE_NOT_MULTIMODE; } -- 2.3.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/