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[108.228.232.20]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-30296dcc464sm15797095eec.14.2026.05.18.15.29.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 May 2026 15:29:40 -0700 (PDT) From: "Derek J. Clark" To: Jiri Kosina , Benjamin Tissoires Cc: "Pierre-Loup A . Griffais" , Denis Benato , Zhouwang Huang , "Derek J . Clark" , linux-input@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 2/4] HID: hid-msi: Add M-key mapping attributes Date: Mon, 18 May 2026 22:29:33 +0000 Message-ID: <20260518222935.1802071-3-derekjohn.clark@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260518222935.1802071-1-derekjohn.clark@gmail.com> References: <20260518222935.1802071-1-derekjohn.clark@gmail.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Adds attributes that allow for remapping the M-keys with up to 5 values when in macro mode. There are 2 mappable buttons on the rear of the device, M1 on the right and M2 on the left. When mapped, the events will fire from one of three event devices: gamepad buttons will fire from the device handled by xpad, while keyboard and mouse events will fire from respectively typed evdevs provided by the input core. Names of each mapping have been kept as close to the event that will fire from the evdev as possible, with context added to the ABS_ events on the direction of the movement. Initial reverse-engineering and implementation of this feature was done by Zhouwang Huang. I refactored the overall format to conform to kernel driver best practices and style guides. Claude was used as an initial reviewer of this patch. Assisted-by: Claude:claude-sonnet-4-6 Co-developed-by: Zhouwang Huang Signed-off-by: Zhouwang Huang Signed-off-by: Derek J. Clark --- v6: - Make all timeouts 25ms to ensure at least 2 jiffies in a 100Hz config. - Gate all attribute show/store functions with gamepad_registered. - Remove duplicated argv_free macro. v5: - Ensure adding "DISABLED" key to valid entries is done in the correct patch. - Re-enable sending an empty string to clear button mappings in addition to setting DISABLED. v4: - Change dev_warn to dev_dbg in claw_profile_event. - use __free with DEFINE_FREE macro for argv instead of manually running argv_free, cleaining up scoped_guard goto. v3: - Use scoped_guard where necessary. v2: - Add mutex for SYNC_TO_ROM commands to ensure every SYNC is completed before more data is written to the MCU volatile memory. - Add mutex for profile_pending to ensure every profile action response is serialized to the generating command. --- drivers/hid/hid-msi.c | 415 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 414 insertions(+), 1 deletion(-) diff --git a/drivers/hid/hid-msi.c b/drivers/hid/hid-msi.c index c79eb0bfeb776..e58d35dba5b40 100644 --- a/drivers/hid/hid-msi.c +++ b/drivers/hid/hid-msi.c @@ -42,6 +42,8 @@ #define CLAW_DINPUT_CFG_INTF_IN 0x82 #define CLAW_XINPUT_CFG_INTF_IN 0x83 +#define CLAW_KEYS_MAX 5 + enum claw_command_index { CLAW_COMMAND_TYPE_READ_PROFILE = 0x04, CLAW_COMMAND_TYPE_READ_PROFILE_ACK = 0x05, @@ -66,6 +68,17 @@ static const char * const claw_gamepad_mode_text[] = { [CLAW_GAMEPAD_MODE_DESKTOP] = "desktop", }; +enum claw_profile_ack_pending { + CLAW_NO_PENDING, + CLAW_M1_PENDING, + CLAW_M2_PENDING, +}; + +enum claw_key_index { + CLAW_KEY_M1, + CLAW_KEY_M2, +}; + enum claw_mkeys_function_index { CLAW_MKEY_FUNCTION_MACRO, CLAW_MKEY_FUNCTION_DISABLED, @@ -78,6 +91,155 @@ static const char * const claw_mkeys_function_text[] = { [CLAW_MKEY_FUNCTION_COMBO] = "combination", }; +static const struct { + u8 code; + const char *name; +} claw_button_mapping_key_map[] = { + /* Gamepad buttons */ + { 0x01, "ABS_HAT0Y_UP" }, + { 0x02, "ABS_HAT0Y_DOWN" }, + { 0x03, "ABS_HAT0X_LEFT" }, + { 0x04, "ABS_HAT0X_RIGHT" }, + { 0x05, "BTN_TL" }, + { 0x06, "BTN_TR" }, + { 0x07, "BTN_THUMBL" }, + { 0x08, "BTN_THUMBR" }, + { 0x09, "BTN_SOUTH" }, + { 0x0a, "BTN_EAST" }, + { 0x0b, "BTN_NORTH" }, + { 0x0c, "BTN_WEST" }, + { 0x0d, "BTN_MODE" }, + { 0x0e, "BTN_SELECT" }, + { 0x0f, "BTN_START" }, + { 0x13, "BTN_TL2"}, + { 0x14, "BTN_TR2"}, + { 0x15, "ABS_Y_UP"}, + { 0x16, "ABS_Y_DOWN"}, + { 0x17, "ABS_X_LEFT"}, + { 0x18, "ABS_X_RIGHT"}, + { 0x19, "ABS_RY_UP"}, + { 0x1a, "ABS_RY_DOWN"}, + { 0x1b, "ABS_RX_LEFT"}, + { 0x1c, "ABS_RX_RIGHT"}, + /* Keyboard keys */ + { 0x32, "KEY_ESC" }, + { 0x33, "KEY_F1" }, + { 0x34, "KEY_F2" }, + { 0x35, "KEY_F3" }, + { 0x36, "KEY_F4" }, + { 0x37, "KEY_F5" }, + { 0x38, "KEY_F6" }, + { 0x39, "KEY_F7" }, + { 0x3a, "KEY_F8" }, + { 0x3b, "KEY_F9" }, + { 0x3c, "KEY_F10" }, + { 0x3d, "KEY_F11" }, + { 0x3e, "KEY_F12" }, + { 0x3f, "KEY_GRAVE" }, + { 0x40, "KEY_1" }, + { 0x41, "KEY_2" }, + { 0x42, "KEY_3" }, + { 0x43, "KEY_4" }, + { 0x44, "KEY_5" }, + { 0x45, "KEY_6" }, + { 0x46, "KEY_7" }, + { 0x47, "KEY_8" }, + { 0x48, "KEY_9" }, + { 0x49, "KEY_0" }, + { 0x4a, "KEY_MINUS" }, + { 0x4b, "KEY_EQUAL" }, + { 0x4c, "KEY_BACKSPACE" }, + { 0x4d, "KEY_TAB" }, + { 0x4e, "KEY_Q" }, + { 0x4f, "KEY_W" }, + { 0x50, "KEY_E" }, + { 0x51, "KEY_R" }, + { 0x52, "KEY_T" }, + { 0x53, "KEY_Y" }, + { 0x54, "KEY_U" }, + { 0x55, "KEY_I" }, + { 0x56, "KEY_O" }, + { 0x57, "KEY_P" }, + { 0x58, "KEY_LEFTBRACE" }, + { 0x59, "KEY_RIGHTBRACE" }, + { 0x5a, "KEY_BACKSLASH" }, + { 0x5b, "KEY_CAPSLOCK" }, + { 0x5c, "KEY_A" }, + { 0x5d, "KEY_S" }, + { 0x5e, "KEY_D" }, + { 0x5f, "KEY_F" }, + { 0x60, "KEY_G" }, + { 0x61, "KEY_H" }, + { 0x62, "KEY_J" }, + { 0x63, "KEY_K" }, + { 0x64, "KEY_L" }, + { 0x65, "KEY_SEMICOLON" }, + { 0x66, "KEY_APOSTROPHE" }, + { 0x67, "KEY_ENTER" }, + { 0x68, "KEY_LEFTSHIFT" }, + { 0x69, "KEY_Z" }, + { 0x6a, "KEY_X" }, + { 0x6b, "KEY_C" }, + { 0x6c, "KEY_V" }, + { 0x6d, "KEY_B" }, + { 0x6e, "KEY_N" }, + { 0x6f, "KEY_M" }, + { 0x70, "KEY_COMMA" }, + { 0x71, "KEY_DOT" }, + { 0x72, "KEY_SLASH" }, + { 0x73, "KEY_RIGHTSHIFT" }, + { 0x74, "KEY_LEFTCTRL" }, + { 0x75, "KEY_LEFTMETA" }, + { 0x76, "KEY_LEFTALT" }, + { 0x77, "KEY_SPACE" }, + { 0x78, "KEY_RIGHTALT" }, + { 0x79, "KEY_RIGHTCTRL" }, + { 0x7a, "KEY_INSERT" }, + { 0x7b, "KEY_HOME" }, + { 0x7c, "KEY_PAGEUP" }, + { 0x7d, "KEY_DELETE" }, + { 0x7e, "KEY_END" }, + { 0x7f, "KEY_PAGEDOWN" }, + { 0x8a, "KEY_KPENTER" }, + { 0x8b, "KEY_KP0" }, + { 0x8c, "KEY_KP1" }, + { 0x8d, "KEY_KP2" }, + { 0x8e, "KEY_KP3" }, + { 0x8f, "KEY_KP4" }, + { 0x90, "KEY_KP5" }, + { 0x91, "KEY_KP6" }, + { 0x92, "KEY_KP7" }, + { 0x93, "KEY_KP8" }, + { 0x94, "KEY_KP9" }, + { 0x95, "MD_PLAY" }, + { 0x96, "MD_STOP" }, + { 0x97, "MD_NEXT" }, + { 0x98, "MD_PREV" }, + { 0x99, "MD_VOL_UP" }, + { 0x9a, "MD_VOL_DOWN" }, + { 0x9b, "MD_VOL_MUTE" }, + { 0x9c, "KEY_F23" }, + /* Mouse events */ + { 0xc8, "BTN_LEFT" }, + { 0xc9, "BTN_MIDDLE" }, + { 0xca, "BTN_RIGHT" }, + { 0xcb, "BTN_SIDE" }, + { 0xcc, "BTN_EXTRA" }, + { 0xcd, "REL_WHEEL_UP" }, + { 0xce, "REL_WHEEL_DOWN" }, + { 0xff, "DISABLED" }, +}; + +static const u16 button_mapping_addr_old[] = { + 0x007a, /* M1 */ + 0x011f, /* M2 */ +}; + +static const u16 button_mapping_addr_new[] = { + 0x00bb, /* M1 */ + 0x0164, /* M2 */ +}; + struct claw_command_report { u8 report_id; u8 padding[2]; @@ -88,22 +250,30 @@ struct claw_command_report { struct claw_drvdata { /* MCU General Variables */ + enum claw_profile_ack_pending profile_pending; struct completion send_cmd_complete; struct delayed_work cfg_resume; struct delayed_work cfg_setup; + struct mutex profile_mutex; /* mutex for profile_pending calls */ struct hid_device *hdev; struct mutex cfg_mutex; /* mutex for synchronous data */ + struct mutex rom_mutex; /* mutex for SYNC_TO_ROM calls */ bool waiting_for_ack; spinlock_t cmd_lock; /* Lock for cmd data read/write */ u8 waiting_cmd; int cmd_status; + u16 bcd_device; u8 ep; /* Gamepad Variables */ enum claw_mkeys_function_index mkeys_function; enum claw_gamepad_mode_index gamepad_mode; + u8 m1_codes[CLAW_KEYS_MAX]; + u8 m2_codes[CLAW_KEYS_MAX]; bool gamepad_registered; spinlock_t mode_lock; /* Lock for mode data read/write */ + const u16 *bmap_addr; + bool bmap_support; }; static int get_endpoint_address(struct hid_device *hdev) @@ -135,6 +305,30 @@ static int claw_gamepad_mode_event(struct claw_drvdata *drvdata, return 0; } +static int claw_profile_event(struct claw_drvdata *drvdata, struct claw_command_report *cmd_rep) +{ + u8 *codes; + int i; + + switch (drvdata->profile_pending) { + case CLAW_M1_PENDING: + case CLAW_M2_PENDING: + codes = (drvdata->profile_pending == CLAW_M1_PENDING) ? + drvdata->m1_codes : drvdata->m2_codes; + for (i = 0; i < CLAW_KEYS_MAX; i++) + codes[i] = (cmd_rep->data[6 + i]); + break; + default: + dev_dbg(&drvdata->hdev->dev, + "Got profile event without changes pending from command: %x\n", + cmd_rep->cmd); + return -EINVAL; + } + drvdata->profile_pending = CLAW_NO_PENDING; + + return 0; +} + static int claw_raw_event(struct claw_drvdata *drvdata, struct hid_report *report, u8 *data, int size) { @@ -165,6 +359,19 @@ static int claw_raw_event(struct claw_drvdata *drvdata, struct hid_report *repor } } + break; + case CLAW_COMMAND_TYPE_READ_PROFILE_ACK: + ret = claw_profile_event(drvdata, cmd_rep); + + scoped_guard(spinlock_irqsave, &drvdata->cmd_lock) { + if (drvdata->waiting_for_ack && + drvdata->waiting_cmd == CLAW_COMMAND_TYPE_READ_PROFILE) { + drvdata->cmd_status = ret; + drvdata->waiting_for_ack = false; + complete(&drvdata->send_cmd_complete); + } + } + break; case CLAW_COMMAND_TYPE_ACK: scoped_guard(spinlock_irqsave, &drvdata->cmd_lock) { @@ -422,6 +629,168 @@ static ssize_t reset_store(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_WO(reset); +static int button_mapping_name_to_code(const char *name) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(claw_button_mapping_key_map); i++) { + if (!strcmp(name, claw_button_mapping_key_map[i].name)) + return claw_button_mapping_key_map[i].code; + } + + return -EINVAL; +} + +static const char *button_mapping_code_to_name(u8 code) +{ + int i; + + if (code == 0xff) + return NULL; + + for (i = 0; i < ARRAY_SIZE(claw_button_mapping_key_map); i++) { + if (claw_button_mapping_key_map[i].code == code) + return claw_button_mapping_key_map[i].name; + } + + return NULL; +} + +static int claw_buttons_store(struct device *dev, const char *buf, u8 mkey_idx) +{ + struct hid_device *hdev = to_hid_device(dev); + struct claw_drvdata *drvdata = hid_get_drvdata(hdev); + u8 data[] = { 0x01, (drvdata->bmap_addr[mkey_idx] >> 8) & 0xff, + drvdata->bmap_addr[mkey_idx] & 0xff, 0x07, + 0x04, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff }; + char **raw_keys __free(argv_free) = NULL; + size_t len = ARRAY_SIZE(data); + int ret, key_count, i; + + if (!drvdata->gamepad_registered) + return -ENODEV; + + raw_keys = argv_split(GFP_KERNEL, buf, &key_count); + if (!raw_keys) + return -ENOMEM; + + if (key_count > CLAW_KEYS_MAX) + return -EINVAL; + + if (key_count == 0) + goto set_buttons; + + for (i = 0; i < key_count; i++) { + ret = button_mapping_name_to_code(raw_keys[i]); + if (ret < 0) + return ret; + + data[6 + i] = ret; + } + +set_buttons: + scoped_guard(mutex, &drvdata->rom_mutex) { + ret = claw_hw_output_report(hdev, CLAW_COMMAND_TYPE_WRITE_PROFILE_DATA, + data, len, 25); + if (ret) + return ret; + + ret = claw_hw_output_report(hdev, CLAW_COMMAND_TYPE_SYNC_TO_ROM, NULL, 0, 25); + } + + return ret; +} + +static int claw_buttons_show(struct device *dev, char *buf, enum claw_key_index m_key) +{ + struct hid_device *hdev = to_hid_device(dev); + struct claw_drvdata *drvdata = hid_get_drvdata(hdev); + u8 data[] = { 0x01, (drvdata->bmap_addr[m_key] >> 8) & 0xff, + drvdata->bmap_addr[m_key] & 0xff, 0x07 }; + size_t len = ARRAY_SIZE(data); + int i, ret, count = 0; + const char *name; + u8 *codes; + + if (!drvdata->gamepad_registered) + return -ENODEV; + + codes = (m_key == CLAW_KEY_M1) ? drvdata->m1_codes : drvdata->m2_codes; + + guard(mutex)(&drvdata->profile_mutex); + drvdata->profile_pending = (m_key == CLAW_KEY_M1) ? CLAW_M1_PENDING : CLAW_M2_PENDING; + + ret = claw_hw_output_report(hdev, CLAW_COMMAND_TYPE_READ_PROFILE, data, len, 25); + if (ret) { + drvdata->profile_pending = CLAW_NO_PENDING; + return ret; + } + for (i = 0; i < CLAW_KEYS_MAX; i++) { + name = button_mapping_code_to_name(codes[i]); + if (name) + count += sysfs_emit_at(buf, count, "%s ", name); + } + + if (!count) + return sysfs_emit(buf, "(not set)\n"); + + buf[count - 1] = '\n'; + + return count; +} + +static ssize_t button_m1_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + + ret = claw_buttons_store(dev, buf, CLAW_KEY_M1); + if (ret) + return ret; + + return count; +} + +static ssize_t button_m1_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return claw_buttons_show(dev, buf, CLAW_KEY_M1); +} +static DEVICE_ATTR_RW(button_m1); + +static ssize_t button_m2_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + + ret = claw_buttons_store(dev, buf, CLAW_KEY_M2); + if (ret) + return ret; + + return count; +} + +static ssize_t button_m2_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return claw_buttons_show(dev, buf, CLAW_KEY_M2); +} +static DEVICE_ATTR_RW(button_m2); + +static ssize_t button_mapping_options_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int i, count = 0; + + for (i = 0; i < ARRAY_SIZE(claw_button_mapping_key_map); i++) + count += sysfs_emit_at(buf, count, "%s ", claw_button_mapping_key_map[i].name); + + buf[count - 1] = '\n'; + + return count; +} +static DEVICE_ATTR_RO(button_mapping_options); + static umode_t claw_gamepad_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) { @@ -434,10 +803,22 @@ static umode_t claw_gamepad_attr_is_visible(struct kobject *kobj, struct attribu return 0; } - return attr->mode; + /* Always show attrs available on all firmware */ + if (attr == &dev_attr_gamepad_mode.attr || + attr == &dev_attr_gamepad_mode_index.attr || + attr == &dev_attr_mkeys_function.attr || + attr == &dev_attr_mkeys_function_index.attr || + attr == &dev_attr_reset.attr) + return attr->mode; + + /* Hide button mapping attrs if it isn't supported */ + return drvdata->bmap_support ? attr->mode : 0; } static struct attribute *claw_gamepad_attrs[] = { + &dev_attr_button_m1.attr, + &dev_attr_button_m2.attr, + &dev_attr_button_mapping_options.attr, &dev_attr_gamepad_mode.attr, &dev_attr_gamepad_mode_index.attr, &dev_attr_mkeys_function.attr, @@ -486,8 +867,31 @@ static void cfg_resume_fn(struct work_struct *work) schedule_delayed_work(&drvdata->cfg_setup, msecs_to_jiffies(500)); } +static void claw_features_supported(struct claw_drvdata *drvdata) +{ + u8 major = (drvdata->bcd_device >> 8) & 0xff; + u8 minor = drvdata->bcd_device & 0xff; + + if (major == 0x01) { + drvdata->bmap_support = true; + if (minor >= 0x66) + drvdata->bmap_addr = button_mapping_addr_new; + else + drvdata->bmap_addr = button_mapping_addr_old; + return; + } + + if ((major == 0x02 && minor >= 0x17) || major >= 0x03) { + drvdata->bmap_support = true; + drvdata->bmap_addr = button_mapping_addr_new; + return; + } +} + static int claw_probe(struct hid_device *hdev, u8 ep) { + struct usb_interface *intf = to_usb_interface(hdev->dev.parent); + struct usb_device *udev = interface_to_usbdev(intf); struct claw_drvdata *drvdata; int ret; @@ -499,7 +903,16 @@ static int claw_probe(struct hid_device *hdev, u8 ep) drvdata->hdev = hdev; drvdata->ep = ep; + /* Determine feature level from firmware version */ + drvdata->bcd_device = le16_to_cpu(udev->descriptor.bcdDevice); + claw_features_supported(drvdata); + + if (!drvdata->bmap_support) + dev_dbg(&hdev->dev, "M-Key mapping is not supported. Update firmware to enable.\n"); + mutex_init(&drvdata->cfg_mutex); + mutex_init(&drvdata->profile_mutex); + mutex_init(&drvdata->rom_mutex); spin_lock_init(&drvdata->cmd_lock); spin_lock_init(&drvdata->mode_lock); init_completion(&drvdata->send_cmd_complete); -- 2.53.0