HID: add vivaldi HID driver

Add vivaldi HID driver. This driver allows us to read and report the top
row layout of keyboards which provide a vendor-defined (Google) HID
usage.

Signed-off-by: Sean O'Brien <seobrien@chromium.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 144 insertions, 0 deletions

diff --git a/drivers/hid/hid-vivaldi.c b/drivers/hid/hid-vivaldi.c
new file mode 100644
index 000000000000..cd7ada48b1d9
--- /dev/null
+++ b/drivers/hid/hid-vivaldi.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * HID support for Vivaldi Keyboard
+ *
+ * Copyright 2020 Google LLC.
+ * Author: Sean O'Brien <seobrien@chromium.org>
+ */
+
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#define MIN_FN_ROW_KEY	1
+#define MAX_FN_ROW_KEY	24
+#define HID_VD_FN_ROW_PHYSMAP 0x00000001
+#define HID_USAGE_FN_ROW_PHYSMAP (HID_UP_GOOGLEVENDOR | HID_VD_FN_ROW_PHYSMAP)
+
+static struct hid_driver hid_vivaldi;
+
+struct vivaldi_data {
+	u32 function_row_physmap[MAX_FN_ROW_KEY - MIN_FN_ROW_KEY + 1];
+	int max_function_row_key;
+};
+
+static ssize_t function_row_physmap_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct hid_device *hdev = to_hid_device(dev);
+	struct vivaldi_data *drvdata = hid_get_drvdata(hdev);
+	ssize_t size = 0;
+	int i;
+
+	if (!drvdata->max_function_row_key)
+		return 0;
+
+	for (i = 0; i < drvdata->max_function_row_key; i++)
+		size += sprintf(buf + size, "%02X ",
+				drvdata->function_row_physmap[i]);
+	size += sprintf(buf + size, "\n");
+	return size;
+}
+
+DEVICE_ATTR_RO(function_row_physmap);
+static struct attribute *sysfs_attrs[] = {
+	&dev_attr_function_row_physmap.attr,
+	NULL
+};
+
+static const struct attribute_group input_attribute_group = {
+	.attrs = sysfs_attrs
+};
+
+static int vivaldi_probe(struct hid_device *hdev,
+			 const struct hid_device_id *id)
+{
+	struct vivaldi_data *drvdata;
+	int ret;
+
+	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
+	hid_set_drvdata(hdev, drvdata);
+
+	ret = hid_parse(hdev);
+	if (ret)
+		return ret;
+
+	return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+}
+
+static void vivaldi_feature_mapping(struct hid_device *hdev,
+				    struct hid_field *field,
+				    struct hid_usage *usage)
+{
+	struct vivaldi_data *drvdata = hid_get_drvdata(hdev);
+	int fn_key;
+	int ret;
+	u32 report_len;
+	u8 *buf;
+
+	if (field->logical != HID_USAGE_FN_ROW_PHYSMAP ||
+	    (usage->hid & HID_USAGE_PAGE) != HID_UP_ORDINAL)
+		return;
+
+	fn_key = (usage->hid & HID_USAGE);
+	if (fn_key < MIN_FN_ROW_KEY || fn_key > MAX_FN_ROW_KEY)
+		return;
+	if (fn_key > drvdata->max_function_row_key)
+		drvdata->max_function_row_key = fn_key;
+
+	buf = hid_alloc_report_buf(field->report, GFP_KERNEL);
+	if (!buf)
+		return;
+
+	report_len = hid_report_len(field->report);
+	ret = hid_hw_raw_request(hdev, field->report->id, buf,
+				 report_len, HID_FEATURE_REPORT,
+				 HID_REQ_GET_REPORT);
+	if (ret < 0) {
+		dev_warn(&hdev->dev, "failed to fetch feature %d\n",
+			 field->report->id);
+		goto out;
+	}
+
+	ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, buf,
+				   report_len, 0);
+	if (ret) {
+		dev_warn(&hdev->dev, "failed to report feature %d\n",
+			 field->report->id);
+		goto out;
+	}
+
+	drvdata->function_row_physmap[fn_key - MIN_FN_ROW_KEY] =
+	    field->value[usage->usage_index];
+
+out:
+	kfree(buf);
+}
+
+static int vivaldi_input_configured(struct hid_device *hdev,
+				    struct hid_input *hidinput)
+{
+	return sysfs_create_group(&hdev->dev.kobj, &input_attribute_group);
+}
+
+static const struct hid_device_id vivaldi_table[] = {
+	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_VIVALDI, HID_ANY_ID,
+		     HID_ANY_ID) },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(hid, vivaldi_table);
+
+static struct hid_driver hid_vivaldi = {
+	.name = "hid-vivaldi",
+	.id_table = vivaldi_table,
+	.probe = vivaldi_probe,
+	.feature_mapping = vivaldi_feature_mapping,
+	.input_configured = vivaldi_input_configured,
+};
+
+module_hid_driver(hid_vivaldi);
+
+MODULE_AUTHOR("Sean O'Brien");
+MODULE_DESCRIPTION("HID vivaldi driver");
+MODULE_LICENSE("GPL");