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