Merge: Rebase Wacom to v6.15

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/7133

This is an almost complete rebase to v6.15 for the wacom driver.

Almost because one commit is left on the side: 88006b8 ("HID: wacom: Initialize brightness of LED trigger"). This one relies on a leds change not yet backported to RHEL 9.

JIRA: https://issues.redhat.com/browse/RHEL-102058

Signed-off-by: Benjamin Tissoires <[email protected]>

Approved-by: Bastien Nocera <[email protected]>
Approved-by: Tony Camuso <[email protected]>
Approved-by: CKI KWF Bot <[email protected]>

Merged-by: Jarod Wilson <[email protected]>

Author: jarodwilson

drivers/hid/wacom.h

@@ -218,6 +218,14 @@ static inline __u32 wacom_s32tou(s32 value, __u8 n)
 	return value & (1 << (n - 1)) ? value & (~(~0U << n)) : value;
 }
 
+static inline u32 wacom_rescale(u32 value, u32 in_max, u32 out_max)
+{
+	if (in_max == 0 || out_max == 0)
+		return 0;
+	value = clamp(value, 0, in_max);
+	return DIV_ROUND_CLOSEST(value * out_max, in_max);
+}
+
 extern const struct hid_device_id wacom_ids[];
 
 void wacom_wac_irq(struct wacom_wac *wacom_wac, size_t len);

drivers/hid/wacom_sys.c

@@ -69,16 +69,34 @@ static void wacom_wac_queue_flush(struct hid_device *hdev,
 				  struct kfifo_rec_ptr_2 *fifo)
 {
 	while (!kfifo_is_empty(fifo)) {
-		u8 buf[WACOM_PKGLEN_MAX];
-		int size;
+		int size = kfifo_peek_len(fifo);
+		u8 *buf;
+		unsigned int count;
 		int err;
 
-		size = kfifo_out(fifo, buf, sizeof(buf));
+		buf = kzalloc(size, GFP_KERNEL);
+		if (!buf) {
+			kfifo_skip(fifo);
+			continue;
+		}
+
+		count = kfifo_out(fifo, buf, size);
+		if (count != size) {
+			// Hard to say what is the "right" action in this
+			// circumstance. Skipping the entry and continuing
+			// to flush seems reasonable enough, however.
+			hid_warn(hdev, "%s: removed fifo entry with unexpected size\n",
+				 __func__);
+			kfree(buf);
+			continue;
+		}
 		err = hid_report_raw_event(hdev, HID_INPUT_REPORT, buf, size, false);
 		if (err) {
 			hid_warn(hdev, "%s: unable to flush event due to error %d\n",
 				 __func__, err);
 		}
+
+		kfree(buf);
 	}
 }
 
@@ -158,13 +176,10 @@ static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
 	if (wacom->wacom_wac.features.type == BOOTLOADER)
 		return 0;
 
-	if (size > WACOM_PKGLEN_MAX)
-		return 1;
-
 	if (wacom_wac_pen_serial_enforce(hdev, report, raw_data, size))
 		return -1;
 
-	memcpy(wacom->wacom_wac.data, raw_data, size);
+	wacom->wacom_wac.data = raw_data;
 
 	wacom_wac_irq(&wacom->wacom_wac, size);
 
@@ -1084,6 +1099,17 @@ static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
 	mutex_lock(&wacom->lock);
 
 	*dest = value & 0x7f;
+	for (unsigned int i = 0; i < wacom->led.count; i++) {
+		struct wacom_group_leds *group = &wacom->led.groups[i];
+
+		for (unsigned int j = 0; j < group->count; j++) {
+			if (dest == &wacom->led.llv)
+				group->leds[j].llv = *dest;
+			else if (dest == &wacom->led.hlv)
+				group->leds[j].hlv = *dest;
+		}
+	}
+
 	err = wacom_led_control(wacom);
 
 	mutex_unlock(&wacom->lock);
@@ -1275,6 +1301,7 @@ static void wacom_devm_kfifo_release(struct device *dev, void *res)
 static int wacom_devm_kfifo_alloc(struct wacom *wacom)
 {
 	struct wacom_wac *wacom_wac = &wacom->wacom_wac;
+	int fifo_size = min(PAGE_SIZE, 10 * wacom_wac->features.pktlen);
 	struct kfifo_rec_ptr_2 *pen_fifo;
 	int error;
 
@@ -1285,7 +1312,7 @@ static int wacom_devm_kfifo_alloc(struct wacom *wacom)
 	if (!pen_fifo)
 		return -ENOMEM;
 
-	error = kfifo_alloc(pen_fifo, WACOM_PKGLEN_MAX, GFP_KERNEL);
+	error = kfifo_alloc(pen_fifo, fifo_size, GFP_KERNEL);
 	if (error) {
 		devres_free(pen_fifo);
 		return error;
@@ -1302,10 +1329,10 @@ enum led_brightness wacom_leds_brightness_get(struct wacom_led *led)
 	struct wacom *wacom = led->wacom;
 
 	if (wacom->led.max_hlv)
-		return led->hlv * LED_FULL / wacom->led.max_hlv;
+		return wacom_rescale(led->hlv, wacom->led.max_hlv, LED_FULL);
 
 	if (wacom->led.max_llv)
-		return led->llv * LED_FULL / wacom->led.max_llv;
+		return wacom_rescale(led->llv, wacom->led.max_llv, LED_FULL);
 
 	/* device doesn't support brightness tuning */
 	return LED_FULL;
@@ -1337,8 +1364,8 @@ static int wacom_led_brightness_set(struct led_classdev *cdev,
 		goto out;
 	}
 
-	led->llv = wacom->led.llv = wacom->led.max_llv * brightness / LED_FULL;
-	led->hlv = wacom->led.hlv = wacom->led.max_hlv * brightness / LED_FULL;
+	led->llv = wacom->led.llv = wacom_rescale(brightness, LED_FULL, wacom->led.max_llv);
+	led->hlv = wacom->led.hlv = wacom_rescale(brightness, LED_FULL, wacom->led.max_hlv);
 
 	wacom->led.groups[led->group].select = led->id;
 
@@ -2019,14 +2046,18 @@ static int wacom_initialize_remotes(struct wacom *wacom)
 
 	remote->remote_dir = kobject_create_and_add("wacom_remote",
 						    &wacom->hdev->dev.kobj);
-	if (!remote->remote_dir)
+	if (!remote->remote_dir) {
+		kfifo_free(&remote->remote_fifo);
 		return -ENOMEM;
+	}
 
 	error = sysfs_create_files(remote->remote_dir, remote_unpair_attrs);
 
 	if (error) {
 		hid_err(wacom->hdev,
 			"cannot create sysfs group err: %d\n", error);
+		kfifo_free(&remote->remote_fifo);
+		kobject_put(remote->remote_dir);
 		return error;
 	}
 
@@ -2241,7 +2272,8 @@ static void wacom_update_name(struct wacom *wacom, const char *suffix)
 		if (hid_is_usb(wacom->hdev)) {
 			struct usb_interface *intf = to_usb_interface(wacom->hdev->dev.parent);
 			struct usb_device *dev = interface_to_usbdev(intf);
-			product_name = dev->product;
+			if (dev->product != NULL)
+				product_name = dev->product;
 		}
 
 		if (wacom->hdev->bus == BUS_I2C) {
@@ -2338,12 +2370,16 @@ static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
 	unsigned int connect_mask = HID_CONNECT_HIDRAW;
 
 	features->pktlen = wacom_compute_pktlen(hdev);
-	if (features->pktlen > WACOM_PKGLEN_MAX)
-		return -EINVAL;
+	if (!features->pktlen)
+		return -ENODEV;
 
 	if (!devres_open_group(&hdev->dev, wacom, GFP_KERNEL))
 		return -ENOMEM;
 
+	error = wacom_devm_kfifo_alloc(wacom);
+	if (error)
+		goto fail;
+
 	wacom->resources = true;
 
 	error = wacom_allocate_inputs(wacom);
@@ -2807,10 +2843,6 @@ static int wacom_probe(struct hid_device *hdev,
 	if (features->check_for_hid_type && features->hid_type != hdev->type)
 		return -ENODEV;
 
-	error = wacom_devm_kfifo_alloc(wacom);
-	if (error)
-		return error;
-
 	wacom_wac->hid_data.inputmode = -1;
 	wacom_wac->mode_report = -1;
 
@@ -2871,6 +2903,7 @@ static void wacom_remove(struct hid_device *hdev)
 	hid_hw_stop(hdev);
 
 	cancel_delayed_work_sync(&wacom->init_work);
+	cancel_delayed_work_sync(&wacom->aes_battery_work);
 	cancel_work_sync(&wacom->wireless_work);
 	cancel_work_sync(&wacom->battery_work);
 	cancel_work_sync(&wacom->remote_work);

drivers/hid/wacom_wac.c

@@ -1201,12 +1201,10 @@ static void wacom_intuos_bt_process_data(struct wacom_wac *wacom,
 
 static int wacom_intuos_bt_irq(struct wacom_wac *wacom, size_t len)
 {
-	unsigned char data[WACOM_PKGLEN_MAX];
+	u8 *data = kmemdup(wacom->data, len, GFP_KERNEL);
 	int i = 1;
 	unsigned power_raw, battery_capacity, bat_charging, ps_connected;
 
-	memcpy(data, wacom->data, len);
-
 	switch (data[0]) {
 	case 0x04:
 		wacom_intuos_bt_process_data(wacom, data + i);
@@ -1230,8 +1228,10 @@ static int wacom_intuos_bt_irq(struct wacom_wac *wacom, size_t len)
 		dev_dbg(wacom->pen_input->dev.parent,
 				"Unknown report: %d,%d size:%zu\n",
 				data[0], data[1], len);
-		return 0;
+		break;
 	}
+
+	kfree(data);
 	return 0;
 }
 
@@ -1353,9 +1353,9 @@ static void wacom_intuos_pro2_bt_pen(struct wacom_wac *wacom)
 					rotation -= 1800;
 
 				input_report_abs(pen_input, ABS_TILT_X,
-						 (char)frame[7]);
+						 (signed char)frame[7]);
 				input_report_abs(pen_input, ABS_TILT_Y,
-						 (char)frame[8]);
+						 (signed char)frame[8]);
 				input_report_abs(pen_input, ABS_Z, rotation);
 				input_report_abs(pen_input, ABS_WHEEL,
 						 get_unaligned_le16(&frame[11]));
@@ -1906,11 +1906,12 @@ static void wacom_map_usage(struct input_dev *input, struct hid_usage *usage,
 		if ((code == ABS_X || code == ABS_Y) && !resolution) {
 			resolution = WACOM_INTUOS_RES;
 			hid_warn(input,
-				 "Wacom usage (%d) missing resolution \n",
-				 code);
+				 "Using default resolution for axis type 0x%x code 0x%x\n",
+				 type, code);
 		}
 		input_abs_set_res(input, code, resolution);
 		break;
+	case EV_REL:
 	case EV_KEY:
 	case EV_MSC:
 	case EV_SW:
@@ -2047,7 +2048,23 @@ static void wacom_wac_pad_usage_mapping(struct hid_device *hdev,
 		features->device_type |= WACOM_DEVICETYPE_PAD;
 		break;
 	case WACOM_HID_WD_TOUCHRING:
-		wacom_map_usage(input, usage, field, EV_ABS, ABS_WHEEL, 0);
+		if (field->flags & HID_MAIN_ITEM_RELATIVE) {
+			wacom_wac->relring_count++;
+			if (wacom_wac->relring_count == 1) {
+				wacom_map_usage(input, usage, field, EV_REL, REL_WHEEL_HI_RES, 0);
+				set_bit(REL_WHEEL, input->relbit);
+			}
+			else if (wacom_wac->relring_count == 2) {
+				wacom_map_usage(input, usage, field, EV_REL, REL_HWHEEL_HI_RES, 0);
+				set_bit(REL_HWHEEL, input->relbit);
+			}
+		} else {
+			wacom_wac->absring_count++;
+			if (wacom_wac->absring_count == 1)
+				wacom_map_usage(input, usage, field, EV_ABS, ABS_WHEEL, 0);
+			else if (wacom_wac->absring_count == 2)
+				wacom_map_usage(input, usage, field, EV_ABS, ABS_THROTTLE, 0);
+		}
 		features->device_type |= WACOM_DEVICETYPE_PAD;
 		break;
 	case WACOM_HID_WD_TOUCHRINGSTATUS:
@@ -2112,7 +2129,10 @@ static void wacom_wac_pad_event(struct hid_device *hdev, struct hid_field *field
 		return;
 
 	if (wacom_equivalent_usage(field->physical) == HID_DG_TABLETFUNCTIONKEY) {
-		if (usage->hid != WACOM_HID_WD_TOUCHRING)
+		bool is_abs_touchring = usage->hid == WACOM_HID_WD_TOUCHRING &&
+					!(field->flags & HID_MAIN_ITEM_RELATIVE);
+
+		if (!is_abs_touchring)
 			wacom_wac->hid_data.inrange_state |= value;
 	}
 
@@ -2165,6 +2185,52 @@ static void wacom_wac_pad_event(struct hid_device *hdev, struct hid_field *field
 				 hdev->product == 0x3AA)
 				value = wacom_offset_rotation(input, usage, value, 1, 2);
 		}
+		else if (field->flags & HID_MAIN_ITEM_RELATIVE) {
+			int hires_value = value * 120 / usage->resolution_multiplier;
+			int *ring_value;
+			int lowres_code;
+
+			if (usage->code == REL_WHEEL_HI_RES) {
+				/* We must invert the sign for vertical
+				 * relative scrolling. Clockwise
+				 * rotation produces positive values
+				 * from HW, but userspace treats
+				 * positive REL_WHEEL as a scroll *up*!
+				 */
+				hires_value = -hires_value;
+				ring_value = &wacom_wac->hid_data.ring_value;
+				lowres_code = REL_WHEEL;
+			}
+			else if (usage->code == REL_HWHEEL_HI_RES) {
+				/* No need to invert the sign for
+				 * horizontal relative scrolling.
+				 * Clockwise rotation produces positive
+				 * values from HW and userspace treats
+				 * positive REL_HWHEEL as a scroll
+				 * right.
+				 */
+				ring_value = &wacom_wac->hid_data.ring2_value;
+				lowres_code = REL_HWHEEL;
+			}
+			else {
+				hid_err(wacom->hdev, "unrecognized relative wheel with code %d\n",
+					usage->code);
+				break;
+			}
+
+			value = hires_value;
+			*ring_value += hires_value;
+
+			/* Emulate a legacy wheel click for every 120
+			 * units of hi-res travel.
+			 */
+			if (*ring_value >= 120 || *ring_value <= -120) {
+				int clicks = *ring_value / 120;
+
+				input_event(input, usage->type, lowres_code, clicks);
+				*ring_value -= clicks * 120;
+			}
+		}
 		else {
 			value = wacom_offset_rotation(input, usage, value, 1, 4);
 		}
@@ -2356,9 +2422,11 @@ static void wacom_wac_pen_event(struct hid_device *hdev, struct hid_field *field
 			wacom_wac->hid_data.sense_state = value;
 		return;
 	case HID_DG_INVERT:
-		wacom_wac->hid_data.invert_state = value;
+		wacom_wac->hid_data.eraser |= value;
 		return;
 	case HID_DG_ERASER:
+		wacom_wac->hid_data.eraser |= value;
+		fallthrough;
 	case HID_DG_TIPSWITCH:
 		wacom_wac->hid_data.tipswitch |= value;
 		return;
@@ -2499,7 +2567,7 @@ static void wacom_wac_pen_report(struct hid_device *hdev,
 
 	if (entering_range) { /* first in range */
 		/* Going into range select tool */
-		if (wacom_wac->hid_data.invert_state)
+		if (wacom_wac->hid_data.eraser)
 			wacom_wac->tool[0] = BTN_TOOL_RUBBER;
 		else if (wacom_wac->features.quirks & WACOM_QUIRK_AESPEN)
 			wacom_wac->tool[0] = BTN_TOOL_PEN;
@@ -2553,6 +2621,7 @@ static void wacom_wac_pen_report(struct hid_device *hdev,
 		}
 
 		wacom_wac->hid_data.tipswitch = false;
+		wacom_wac->hid_data.eraser = false;
 
 		input_sync(input);
 	}
@@ -4877,6 +4946,10 @@ static const struct wacom_features wacom_features_0x94 =
 	HID_DEVICE(BUS_I2C, HID_GROUP_WACOM, USB_VENDOR_ID_WACOM, prod),\
 	.driver_data = (kernel_ulong_t)&wacom_features_##prod
 
+#define PCI_DEVICE_WACOM(prod)						\
+	HID_DEVICE(BUS_PCI, HID_GROUP_WACOM, USB_VENDOR_ID_WACOM, prod),\
+	.driver_data = (kernel_ulong_t)&wacom_features_##prod
+
 #define USB_DEVICE_LENOVO(prod)					\
 	HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, prod),			\
 	.driver_data = (kernel_ulong_t)&wacom_features_##prod
@@ -5046,6 +5119,7 @@ const struct hid_device_id wacom_ids[] = {
 
 	{ USB_DEVICE_WACOM(HID_ANY_ID) },
 	{ I2C_DEVICE_WACOM(HID_ANY_ID) },
+	{ PCI_DEVICE_WACOM(HID_ANY_ID) },
 	{ BT_DEVICE_WACOM(HID_ANY_ID) },
 	{ }
 };