1 files changed, 464 insertions, 19 deletions

diff --git a/drivers/hid/hid-lg-g15.c b/drivers/hid/hid-lg-g15.c
index f8605656257b..1a88bc44ada4 100644
--- a/drivers/hid/hid-lg-g15.c
+++ b/drivers/hid/hid-lg-g15.c
@@ -26,7 +26,24 @@
 #define LG_G510_FEATURE_BACKLIGHT_RGB	0x05
 #define LG_G510_FEATURE_POWER_ON_RGB	0x06
 
+#define LG_G510_INPUT_MACRO_KEYS	0x03
+#define LG_G510_INPUT_KBD_BACKLIGHT	0x04
+
+#define LG_G13_INPUT_REPORT		0x01
+#define LG_G13_FEATURE_M_KEYS_LEDS	0x05
+#define LG_G13_FEATURE_BACKLIGHT_RGB	0x07
+#define LG_G13_BACKLIGHT_HW_ON_BIT	23
+
+/**
+ * g13_input_report.keybits[] is not 32-bit aligned, so we can't use the bitops macros.
+ *
+ * @ary: Pointer to array of u8s
+ * @b: Bit index into ary, LSB first.  Not range checked.
+ */
+#define TEST_BIT(ary, b)	((1 << ((b) & 7)) & (ary)[(b) >> 3])
+
 enum lg_g15_model {
+	LG_G13,
 	LG_G15,
 	LG_G15_V2,
 	LG_G510,
@@ -45,6 +62,12 @@ enum lg_g15_led_type {
 	LG_G15_LED_MAX
 };
 
+struct g13_input_report {
+	u8 report_id;	/* Report ID is always set to 1. */
+	u8 joy_x, joy_y;
+	u8 keybits[5];
+};
+
 struct lg_g15_led {
 	union {
 		struct led_classdev cdev;
@@ -63,12 +86,188 @@ struct lg_g15_data {
 	struct mutex mutex;
 	struct work_struct work;
 	struct input_dev *input;
+	struct input_dev *input_js; /* Separate joystick device for G13. */
 	struct hid_device *hdev;
 	enum lg_g15_model model;
 	struct lg_g15_led leds[LG_G15_LED_MAX];
 	bool game_mode_enabled;
+	bool backlight_disabled;	/* true == HW backlight toggled *OFF* */
 };
 
+/********* G13 LED functions ***********/
+/*
+ * G13 retains no state across power cycles, and always powers up with the backlight on,
+ * color #5AFF6E, all macro key LEDs off.
+ */
+static int lg_g13_get_leds_state(struct lg_g15_data *g15)
+{
+	u8 * const tbuf = g15->transfer_buf;
+	int ret, high;
+
+	/* RGB backlight. */
+	ret = hid_hw_raw_request(g15->hdev, LG_G13_FEATURE_BACKLIGHT_RGB,
+				 tbuf, 5,
+				 HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
+	if (ret != 5) {
+		hid_err(g15->hdev, "Error getting backlight brightness: %d\n", ret);
+		return (ret < 0) ? ret : -EIO;
+	}
+
+	/* Normalize RGB intensities against the highest component. */
+	high = max3(tbuf[1], tbuf[2], tbuf[3]);
+	if (high) {
+		g15->leds[LG_G15_KBD_BRIGHTNESS].red =
+			DIV_ROUND_CLOSEST(tbuf[1] * 255, high);
+		g15->leds[LG_G15_KBD_BRIGHTNESS].green =
+			DIV_ROUND_CLOSEST(tbuf[2] * 255, high);
+		g15->leds[LG_G15_KBD_BRIGHTNESS].blue =
+			DIV_ROUND_CLOSEST(tbuf[3] * 255, high);
+		g15->leds[LG_G15_KBD_BRIGHTNESS].brightness = high;
+	} else {
+		g15->leds[LG_G15_KBD_BRIGHTNESS].red        = 255;
+		g15->leds[LG_G15_KBD_BRIGHTNESS].green      = 255;
+		g15->leds[LG_G15_KBD_BRIGHTNESS].blue       = 255;
+		g15->leds[LG_G15_KBD_BRIGHTNESS].brightness = 0;
+	}
+
+	/* Macro LEDs. */
+	ret = hid_hw_raw_request(g15->hdev, LG_G13_FEATURE_M_KEYS_LEDS,
+				 tbuf, 5,
+				 HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
+	if (ret != 5) {
+		hid_err(g15->hdev, "Error getting macro LED brightness: %d\n", ret);
+		return (ret < 0) ? ret : -EIO;
+	}
+
+	for (int i = LG_G15_MACRO_PRESET1; i < LG_G15_LED_MAX; ++i)
+		g15->leds[i].brightness = !!(tbuf[1] & (1 << (i - LG_G15_MACRO_PRESET1)));
+
+	/*
+	 * Bit 23 of g13_input_report.keybits[] contains the backlight's
+	 * current HW toggle state.  Retrieve it from the device.
+	 */
+	ret = hid_hw_raw_request(g15->hdev, LG_G13_INPUT_REPORT,
+				 tbuf, sizeof(struct g13_input_report),
+				 HID_INPUT_REPORT, HID_REQ_GET_REPORT);
+	if (ret != sizeof(struct g13_input_report)) {
+		hid_err(g15->hdev, "Error getting backlight on/off state: %d\n", ret);
+		return (ret < 0) ? ret : -EIO;
+	}
+	g15->backlight_disabled =
+		!TEST_BIT(((struct g13_input_report *) tbuf)->keybits,
+			  LG_G13_BACKLIGHT_HW_ON_BIT);
+
+	return 0;
+}
+
+static int lg_g13_kbd_led_write(struct lg_g15_data *g15,
+				struct lg_g15_led *g15_led,
+				enum led_brightness brightness)
+{
+	struct mc_subled const * const subleds = g15_led->mcdev.subled_info;
+	u8 * const tbuf = g15->transfer_buf;
+	int ret;
+
+	guard(mutex)(&g15->mutex);
+
+	led_mc_calc_color_components(&g15_led->mcdev, brightness);
+
+	tbuf[0] = 5;
+	tbuf[1] = subleds[0].brightness;
+	tbuf[2] = subleds[1].brightness;
+	tbuf[3] = subleds[2].brightness;
+	tbuf[4] = 0;
+
+	ret = hid_hw_raw_request(g15->hdev, LG_G13_FEATURE_BACKLIGHT_RGB,
+				 tbuf, 5,
+				 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+	if (ret != 5) {
+		hid_err(g15->hdev, "Error setting backlight brightness: %d\n", ret);
+		return (ret < 0) ? ret : -EIO;
+	}
+
+	g15_led->brightness = brightness;
+	return 0;
+}
+
+static int lg_g13_kbd_led_set(struct led_classdev *led_cdev, enum led_brightness brightness)
+{
+	struct led_classdev_mc *mc = lcdev_to_mccdev(led_cdev);
+	struct lg_g15_led *g15_led =
+		container_of(mc, struct lg_g15_led, mcdev);
+	struct lg_g15_data *g15 = dev_get_drvdata(led_cdev->dev->parent);
+
+	/* Ignore LED off on unregister / keyboard unplug */
+	if (led_cdev->flags & LED_UNREGISTERING)
+		return 0;
+
+	return lg_g13_kbd_led_write(g15, g15_led, brightness);
+}
+
+static enum led_brightness lg_g13_kbd_led_get(struct led_classdev *led_cdev)
+{
+	struct led_classdev_mc const * const mc = lcdev_to_mccdev(led_cdev);
+	struct lg_g15_led const *g15_led =
+		container_of(mc, struct lg_g15_led, mcdev);
+
+	return g15_led->brightness;
+}
+
+static int lg_g13_mkey_led_set(struct led_classdev *led_cdev, enum led_brightness brightness)
+{
+	struct lg_g15_led *g15_led =
+		container_of(led_cdev, struct lg_g15_led, cdev);
+	struct lg_g15_data *g15 = dev_get_drvdata(led_cdev->dev->parent);
+	int i, ret;
+	u8 * const tbuf = g15->transfer_buf;
+	u8 val, mask = 0;
+
+	/* Ignore LED off on unregister / keyboard unplug */
+	if (led_cdev->flags & LED_UNREGISTERING)
+		return 0;
+
+	guard(mutex)(&g15->mutex);
+
+	for (i = LG_G15_MACRO_PRESET1; i < LG_G15_LED_MAX; ++i) {
+		if (i == g15_led->led)
+			val = brightness;
+		else
+			val = g15->leds[i].brightness;
+
+		if (val)
+			mask |= 1 << (i - LG_G15_MACRO_PRESET1);
+	}
+
+	tbuf[0] = 5;
+	tbuf[1] = mask;
+	tbuf[2] = 0;
+	tbuf[3] = 0;
+	tbuf[4] = 0;
+
+	ret = hid_hw_raw_request(g15->hdev, LG_G13_FEATURE_M_KEYS_LEDS,
+				 tbuf, 5,
+				 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+	if (ret != 5) {
+		hid_err(g15->hdev, "Error setting LED brightness: %d\n", ret);
+		return (ret < 0) ? ret : -EIO;
+	}
+
+	g15_led->brightness = brightness;
+	return 0;
+}
+
+static enum led_brightness lg_g13_mkey_led_get(struct led_classdev *led_cdev)
+{
+	/*
+	 * G13 doesn't change macro key LEDs behind our back, so they're
+	 * whatever we last set them to.
+	 */
+	struct lg_g15_led *g15_led =
+		container_of(led_cdev, struct lg_g15_led, cdev);
+
+	return g15_led->brightness;
+}
+
 /******** G15 and G15 v2 LED functions ********/
 
 static int lg_g15_update_led_brightness(struct lg_g15_data *g15)
@@ -227,6 +426,20 @@ static int lg_g510_get_initial_led_brightness(struct lg_g15_data *g15, int i)
 		g15->leds[i].brightness = 0;
 	}
 
+	if (i)
+		return 0;
+
+	ret = hid_hw_raw_request(g15->hdev, LG_G510_INPUT_KBD_BACKLIGHT,
+				 g15->transfer_buf, 2,
+				 HID_INPUT_REPORT, HID_REQ_GET_REPORT);
+	if (ret != 2) {
+		/* This can happen when a KVM switch is used, so only warn. */
+		hid_warn(g15->hdev, "Error getting backlight state: %d\n", ret);
+		return 0;
+	}
+
+	g15->backlight_disabled = g15->transfer_buf[1] & 0x04;
+
 	return 0;
 }
 
@@ -390,6 +603,8 @@ static int lg_g15_get_initial_led_brightness(struct lg_g15_data *g15)
 	int ret;
 
 	switch (g15->model) {
+	case LG_G13:
+		return lg_g13_get_leds_state(g15);
 	case LG_G15:
 	case LG_G15_V2:
 		return lg_g15_update_led_brightness(g15);
@@ -417,6 +632,108 @@ static int lg_g15_get_initial_led_brightness(struct lg_g15_data *g15)
 
 /******** Input functions ********/
 
+/* Table mapping keybits[] bit positions to event codes. */
+/* Note: Indices are discontinuous to aid readability. */
+static const u16 g13_keys_for_bits[] = {
+	/* Main keypad - keys G1 - G22 */
+	[0] = KEY_MACRO1,
+	[1] = KEY_MACRO2,
+	[2] = KEY_MACRO3,
+	[3] = KEY_MACRO4,
+	[4] = KEY_MACRO5,
+	[5] = KEY_MACRO6,
+	[6] = KEY_MACRO7,
+	[7] = KEY_MACRO8,
+	[8] = KEY_MACRO9,
+	[9] = KEY_MACRO10,
+	[10] = KEY_MACRO11,
+	[11] = KEY_MACRO12,
+	[12] = KEY_MACRO13,
+	[13] = KEY_MACRO14,
+	[14] = KEY_MACRO15,
+	[15] = KEY_MACRO16,
+	[16] = KEY_MACRO17,
+	[17] = KEY_MACRO18,
+	[18] = KEY_MACRO19,
+	[19] = KEY_MACRO20,
+	[20] = KEY_MACRO21,
+	[21] = KEY_MACRO22,
+
+	/* LCD menu buttons. */
+	[24] = KEY_KBD_LCD_MENU5,	/* "Next page" button */
+	[25] = KEY_KBD_LCD_MENU1,	/* Left-most */
+	[26] = KEY_KBD_LCD_MENU2,
+	[27] = KEY_KBD_LCD_MENU3,
+	[28] = KEY_KBD_LCD_MENU4,	/* Right-most */
+
+	/* Macro preset and record buttons; have red LEDs under them. */
+	[29] = KEY_MACRO_PRESET1,
+	[30] = KEY_MACRO_PRESET2,
+	[31] = KEY_MACRO_PRESET3,
+	[32] = KEY_MACRO_RECORD_START,
+
+	/* 33-35 handled by joystick device. */
+
+	/* Backlight toggle. */
+	[37] = KEY_LIGHTS_TOGGLE,
+};
+
+#define G13_JS_KEYBITS_OFFSET	33
+
+static const u16 g13_keys_for_bits_js[] = {
+	/* Joystick buttons */
+	/* These keybits are at bit indices 33, 34, and 35. */
+	BTN_BASE,	/* Left side */
+	BTN_BASE2,	/* Bottom side */
+	BTN_THUMB,	/* Stick depress */
+};
+
+static int lg_g13_event(struct lg_g15_data *g15, u8 const *data)
+{
+	struct g13_input_report const * const rep = (struct g13_input_report *) data;
+	int i, val;
+	bool backlight_disabled;
+
+	/*
+	 * Main macropad and menu keys.
+	 * Emit key events defined for each bit position.
+	 */
+	for (i = 0; i < ARRAY_SIZE(g13_keys_for_bits); ++i) {
+		if (g13_keys_for_bits[i]) {
+			val = TEST_BIT(rep->keybits, i);
+			input_report_key(g15->input, g13_keys_for_bits[i], val);
+		}
+	}
+	input_sync(g15->input);
+
+	/*
+	 * Joystick.
+	 * Emit button and deflection events.
+	 */
+	for (i = 0; i < ARRAY_SIZE(g13_keys_for_bits_js); ++i) {
+		val = TEST_BIT(rep->keybits, i + G13_JS_KEYBITS_OFFSET);
+		input_report_key(g15->input_js, g13_keys_for_bits_js[i], val);
+	}
+	input_report_abs(g15->input_js, ABS_X, rep->joy_x);
+	input_report_abs(g15->input_js, ABS_Y, rep->joy_y);
+	input_sync(g15->input_js);
+
+	/*
+	 * Bit 23 of keybits[] reports the current backlight on/off state.  If
+	 * it has changed from the last cached value, apply an update.
+	 */
+	backlight_disabled = !TEST_BIT(rep->keybits, LG_G13_BACKLIGHT_HW_ON_BIT);
+	if (backlight_disabled ^ g15->backlight_disabled) {
+		led_classdev_notify_brightness_hw_changed(
+			&g15->leds[LG_G15_KBD_BRIGHTNESS].mcdev.led_cdev,
+			backlight_disabled
+			? 0 : g15->leds[LG_G15_KBD_BRIGHTNESS].brightness);
+		g15->backlight_disabled = backlight_disabled;
+	}
+
+	return 0;
+}
+
 /* On the G15 Mark I Logitech has been quite creative with which bit is what */
 static void lg_g15_handle_lcd_menu_keys(struct lg_g15_data *g15, u8 *data)
 {
@@ -549,14 +866,24 @@ static int lg_g510_event(struct lg_g15_data *g15, u8 *data)
 
 static int lg_g510_leds_event(struct lg_g15_data *g15, u8 *data)
 {
+	struct lg_g15_led *g15_led = &g15->leds[LG_G15_KBD_BRIGHTNESS];
 	bool backlight_disabled;
 
+	backlight_disabled = data[1] & 0x04;
+	if (backlight_disabled == g15->backlight_disabled)
+		return 0;
+
+	led_classdev_notify_brightness_hw_changed(
+		&g15_led->mcdev.led_cdev,
+		backlight_disabled ? 0 : g15_led->brightness);
+
+	g15->backlight_disabled = backlight_disabled;
+
 	/*
 	 * The G510 ignores backlight updates when the backlight is turned off
 	 * through the light toggle button on the keyboard, to work around this
 	 * we queue a workitem to sync values when the backlight is turned on.
 	 */
-	backlight_disabled = data[1] & 0x04;
 	if (!backlight_disabled)
 		schedule_work(&g15->work);
 
@@ -572,6 +899,10 @@ static int lg_g15_raw_event(struct hid_device *hdev, struct hid_report *report,
 		return 0;
 
 	switch (g15->model) {
+	case LG_G13:
+		if (data[0] == 0x01 && size == sizeof(struct g13_input_report))
+			return lg_g13_event(g15, data);
+		break;
 	case LG_G15:
 		if (data[0] == 0x02 && size == 9)
 			return lg_g15_event(g15, data);
@@ -588,9 +919,9 @@ static int lg_g15_raw_event(struct hid_device *hdev, struct hid_report *report,
 		break;
 	case LG_G510:
 	case LG_G510_USB_AUDIO:
-		if (data[0] == 0x03 && size == 5)
+		if (data[0] == LG_G510_INPUT_MACRO_KEYS && size == 5)
 			return lg_g510_event(g15, data);
-		if (data[0] == 0x04 && size == 2)
+		if (data[0] == LG_G510_INPUT_KBD_BACKLIGHT && size == 2)
 			return lg_g510_leds_event(g15, data);
 		break;
 	}
@@ -616,13 +947,24 @@ static void lg_g15_setup_led_rgb(struct lg_g15_data *g15, int index)
 {
 	int i;
 	struct mc_subled *subled_info;
-
-	g15->leds[index].mcdev.led_cdev.brightness_set_blocking =
-		lg_g510_kbd_led_set;
-	g15->leds[index].mcdev.led_cdev.brightness_get =
-		lg_g510_kbd_led_get;
-	g15->leds[index].mcdev.led_cdev.max_brightness = 255;
-	g15->leds[index].mcdev.num_colors = 3;
+	struct lg_g15_led * const gled = &g15->leds[index];
+
+	if (g15->model == LG_G13) {
+		gled->mcdev.led_cdev.brightness_set_blocking =
+			lg_g13_kbd_led_set;
+		gled->mcdev.led_cdev.brightness_get =
+			lg_g13_kbd_led_get;
+		gled->mcdev.led_cdev.flags = LED_BRIGHT_HW_CHANGED;
+	} else {
+		gled->mcdev.led_cdev.brightness_set_blocking =
+			lg_g510_kbd_led_set;
+		gled->mcdev.led_cdev.brightness_get =
+			lg_g510_kbd_led_get;
+		if (index == LG_G15_KBD_BRIGHTNESS)
+			g15->leds[index].mcdev.led_cdev.flags = LED_BRIGHT_HW_CHANGED;
+	}
+	gled->mcdev.led_cdev.max_brightness = 255;
+	gled->mcdev.num_colors = 3;
 
 	subled_info = devm_kcalloc(&g15->hdev->dev, 3, sizeof(*subled_info), GFP_KERNEL);
 	if (!subled_info)
@@ -632,20 +974,20 @@ static void lg_g15_setup_led_rgb(struct lg_g15_data *g15, int index)
 		switch (i + 1) {
 		case LED_COLOR_ID_RED:
 			subled_info[i].color_index = LED_COLOR_ID_RED;
-			subled_info[i].intensity = g15->leds[index].red;
+			subled_info[i].intensity = gled->red;
 			break;
 		case LED_COLOR_ID_GREEN:
 			subled_info[i].color_index = LED_COLOR_ID_GREEN;
-			subled_info[i].intensity = g15->leds[index].green;
+			subled_info[i].intensity = gled->green;
 			break;
 		case LED_COLOR_ID_BLUE:
 			subled_info[i].color_index = LED_COLOR_ID_BLUE;
-			subled_info[i].intensity = g15->leds[index].blue;
+			subled_info[i].intensity = gled->blue;
 			break;
 		}
 		subled_info[i].channel = i;
 	}
-	g15->leds[index].mcdev.subled_info = subled_info;
+	gled->mcdev.subled_info = subled_info;
 }
 
 static int lg_g15_register_led(struct lg_g15_data *g15, int i, const char *name)
@@ -656,6 +998,23 @@ static int lg_g15_register_led(struct lg_g15_data *g15, int i, const char *name)
 	g15->leds[i].cdev.name = name;
 
 	switch (g15->model) {
+	case LG_G13:
+		if (i < LG_G15_BRIGHTNESS_MAX) {
+			/* RGB backlight. */
+			lg_g15_setup_led_rgb(g15, i);
+			ret = devm_led_classdev_multicolor_register_ext(&g15->hdev->dev,
+									&g15->leds[i].mcdev,
+									NULL);
+		} else {
+			/* Macro keys */
+			g15->leds[i].cdev.brightness_set_blocking = lg_g13_mkey_led_set;
+			g15->leds[i].cdev.brightness_get = lg_g13_mkey_led_get;
+			g15->leds[i].cdev.max_brightness = 1;
+
+			ret = devm_led_classdev_register(&g15->hdev->dev,
+							 &g15->leds[i].cdev);
+		}
+		break;
 	case LG_G15:
 	case LG_G15_V2:
 		g15->leds[i].cdev.brightness_get = lg_g15_led_get;
@@ -702,11 +1061,9 @@ static int lg_g15_register_led(struct lg_g15_data *g15, int i, const char *name)
 }
 
 /* Common input device init code shared between keyboards and Z-10 speaker handling */
-static void lg_g15_init_input_dev(struct hid_device *hdev, struct input_dev *input,
-				  const char *name)
+static void lg_g15_init_input_dev_core(struct hid_device *hdev, struct input_dev *input,
+				       char const *name)
 {
-	int i;
-
 	input->name = name;
 	input->phys = hdev->phys;
 	input->uniq = hdev->uniq;
@@ -717,12 +1074,42 @@ static void lg_g15_init_input_dev(struct hid_device *hdev, struct input_dev *inp
 	input->dev.parent = &hdev->dev;
 	input->open = lg_g15_input_open;
 	input->close = lg_g15_input_close;
+}
+
+static void lg_g15_init_input_dev(struct hid_device *hdev, struct input_dev *input,
+				  const char *name)
+{
+	int i;
+
+	lg_g15_init_input_dev_core(hdev, input, name);
 
 	/* Keys below the LCD, intended for controlling a menu on the LCD */
 	for (i = 0; i < 5; i++)
 		input_set_capability(input, EV_KEY, KEY_KBD_LCD_MENU1 + i);
 }
 
+static void lg_g13_init_input_dev(struct hid_device *hdev,
+				  struct input_dev *input, const char *name,
+				  struct input_dev *input_js, const char *name_js)
+{
+	/* Macropad. */
+	lg_g15_init_input_dev_core(hdev, input, name);
+	for (int i = 0; i < ARRAY_SIZE(g13_keys_for_bits); ++i) {
+		if (g13_keys_for_bits[i])
+			input_set_capability(input, EV_KEY, g13_keys_for_bits[i]);
+	}
+
+	/* OBTW, we're a joystick, too... */
+	lg_g15_init_input_dev_core(hdev, input_js, name_js);
+	for (int i = 0; i < ARRAY_SIZE(g13_keys_for_bits_js); ++i)
+		input_set_capability(input_js, EV_KEY, g13_keys_for_bits_js[i]);
+
+	input_set_capability(input_js, EV_ABS, ABS_X);
+	input_set_abs_params(input_js, ABS_X, 0, 255, 0, 0);
+	input_set_capability(input_js, EV_ABS, ABS_Y);
+	input_set_abs_params(input_js, ABS_Y, 0, 255, 0, 0);
+}
+
 static int lg_g15_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
 	static const char * const led_names[] = {
@@ -739,7 +1126,7 @@ static int lg_g15_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	unsigned int connect_mask = 0;
 	bool has_ff000000 = false;
 	struct lg_g15_data *g15;
-	struct input_dev *input;
+	struct input_dev *input, *input_js;
 	struct hid_report *rep;
 	int ret, i, gkeys = 0;
 
@@ -778,6 +1165,25 @@ static int lg_g15_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	hid_set_drvdata(hdev, (void *)g15);
 
 	switch (g15->model) {
+	case LG_G13:
+		/*
+		 * The G13 has an analog thumbstick with nearby buttons.  Some
+		 * libraries and applications are known to ignore devices that
+		 * don't "look like" a joystick, and a device with two ABS axes
+		 * and 25+ macro keys would confuse them.
+		 *
+		 * Create an additional input device dedicated to appear as a
+		 * simplified joystick (two ABS axes, three BTN buttons).
+		 */
+		input_js = devm_input_allocate_device(&hdev->dev);
+		if (!input_js)
+			return -ENOMEM;
+		g15->input_js = input_js;
+		input_set_drvdata(input_js, hdev);
+
+		connect_mask = HID_CONNECT_HIDRAW;
+		gkeys = 25;
+		break;
 	case LG_G15:
 		INIT_WORK(&g15->work, lg_g15_leds_changed_work);
 		/*
@@ -859,6 +1265,38 @@ static int lg_g15_probe(struct hid_device *hdev, const struct hid_device_id *id)
 			goto error_hw_stop;
 
 		return 0; /* All done */
+	} else if (g15->model == LG_G13) {
+		static char const * const g13_led_names[] = {
+			/* Backlight is shared between LCD and keys. */
+			"g13:rgb:kbd_backlight",
+			NULL,	/* Keep in sync with led_type enum */
+			"g13:red:macro_preset_1",
+			"g13:red:macro_preset_2",
+			"g13:red:macro_preset_3",
+			"g13:red:macro_record",
+		};
+		lg_g13_init_input_dev(hdev,
+				      input, "Logitech G13 Gaming Keypad",
+				      input_js, "Logitech G13 Thumbstick");
+		ret = input_register_device(input);
+		if (ret)
+			goto error_hw_stop;
+		ret = input_register_device(input_js);
+		if (ret)
+			goto error_hw_stop;
+
+		for (i = 0; i < ARRAY_SIZE(g13_led_names); ++i) {
+			if (g13_led_names[i]) {
+				ret = lg_g15_register_led(g15, i, g13_led_names[i]);
+				if (ret)
+					goto error_hw_stop;
+			}
+		}
+		led_classdev_notify_brightness_hw_changed(
+			&g15->leds[LG_G15_KBD_BRIGHTNESS].mcdev.led_cdev,
+			g15->backlight_disabled
+			? 0 : g15->leds[LG_G15_KBD_BRIGHTNESS].brightness);
+		return 0;
 	}
 
 	/* Setup and register input device */
@@ -903,6 +1341,13 @@ error_hw_stop:
 }
 
 static const struct hid_device_id lg_g15_devices[] = {
+	/*
+	 * The G13 is a macropad-only device with an LCD, LED backlighing,
+	 * and joystick.
+	 */
+	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+			 USB_DEVICE_ID_LOGITECH_G13),
+		.driver_data = LG_G13 },
 	/* The G11 is a G15 without the LCD, treat it as a G15 */
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
 		USB_DEVICE_ID_LOGITECH_G11),