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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 263 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.208660670@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
275 lines
6.4 KiB
C
275 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ISHTP-HID glue driver.
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*
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* Copyright (c) 2012-2016, Intel Corporation.
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*/
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#include <linux/hid.h>
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#include <linux/intel-ish-client-if.h>
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#include <uapi/linux/input.h>
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#include "ishtp-hid.h"
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/**
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* ishtp_hid_parse() - hid-core .parse() callback
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* @hid: hid device instance
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*
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* This function gets called during call to hid_add_device
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*
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* Return: 0 on success and non zero on error
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*/
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static int ishtp_hid_parse(struct hid_device *hid)
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{
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struct ishtp_hid_data *hid_data = hid->driver_data;
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struct ishtp_cl_data *client_data = hid_data->client_data;
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int rv;
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rv = hid_parse_report(hid, client_data->report_descr[hid_data->index],
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client_data->report_descr_size[hid_data->index]);
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if (rv)
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return rv;
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return 0;
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}
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/* Empty callbacks with success return code */
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static int ishtp_hid_start(struct hid_device *hid)
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{
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return 0;
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}
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static void ishtp_hid_stop(struct hid_device *hid)
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{
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}
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static int ishtp_hid_open(struct hid_device *hid)
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{
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return 0;
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}
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static void ishtp_hid_close(struct hid_device *hid)
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{
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}
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static int ishtp_raw_request(struct hid_device *hid, unsigned char reportnum,
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__u8 *buf, size_t len, unsigned char rtype,
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int reqtype)
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{
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struct ishtp_hid_data *hid_data = hid->driver_data;
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char *ishtp_buf = NULL;
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size_t ishtp_buf_len;
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unsigned int header_size = sizeof(struct hostif_msg);
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if (rtype == HID_OUTPUT_REPORT)
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return -EINVAL;
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hid_data->request_done = false;
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switch (reqtype) {
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case HID_REQ_GET_REPORT:
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hid_data->raw_buf = buf;
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hid_data->raw_buf_size = len;
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hid_data->raw_get_req = true;
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hid_ishtp_get_report(hid, reportnum, rtype);
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break;
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case HID_REQ_SET_REPORT:
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/*
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* Spare 7 bytes for 64b accesses through
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* get/put_unaligned_le64()
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*/
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ishtp_buf_len = len + header_size;
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ishtp_buf = kzalloc(ishtp_buf_len + 7, GFP_KERNEL);
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if (!ishtp_buf)
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return -ENOMEM;
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memcpy(ishtp_buf + header_size, buf, len);
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hid_ishtp_set_feature(hid, ishtp_buf, ishtp_buf_len, reportnum);
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kfree(ishtp_buf);
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break;
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}
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hid_hw_wait(hid);
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return len;
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}
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/**
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* ishtp_hid_request() - hid-core .request() callback
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* @hid: hid device instance
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* @rep: pointer to hid_report
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* @reqtype: type of req. [GET|SET]_REPORT
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*
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* This function is used to set/get feaure/input report.
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*/
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static void ishtp_hid_request(struct hid_device *hid, struct hid_report *rep,
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int reqtype)
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{
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struct ishtp_hid_data *hid_data = hid->driver_data;
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/* the specific report length, just HID part of it */
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unsigned int len = ((rep->size - 1) >> 3) + 1 + (rep->id > 0);
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char *buf;
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unsigned int header_size = sizeof(struct hostif_msg);
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len += header_size;
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hid_data->request_done = false;
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switch (reqtype) {
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case HID_REQ_GET_REPORT:
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hid_data->raw_get_req = false;
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hid_ishtp_get_report(hid, rep->id, rep->type);
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break;
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case HID_REQ_SET_REPORT:
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/*
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* Spare 7 bytes for 64b accesses through
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* get/put_unaligned_le64()
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*/
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buf = kzalloc(len + 7, GFP_KERNEL);
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if (!buf)
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return;
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hid_output_report(rep, buf + header_size);
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hid_ishtp_set_feature(hid, buf, len, rep->id);
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kfree(buf);
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break;
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}
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}
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/**
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* ishtp_wait_for_response() - hid-core .wait() callback
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* @hid: hid device instance
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*
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* This function is used to wait after get feaure/input report.
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*
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* Return: 0 on success and non zero on error
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*/
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static int ishtp_wait_for_response(struct hid_device *hid)
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{
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struct ishtp_hid_data *hid_data = hid->driver_data;
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int rv;
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hid_ishtp_trace(client_data, "%s hid %p\n", __func__, hid);
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rv = ishtp_hid_link_ready_wait(hid_data->client_data);
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if (rv)
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return rv;
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if (!hid_data->request_done)
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wait_event_interruptible_timeout(hid_data->hid_wait,
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hid_data->request_done, 3 * HZ);
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if (!hid_data->request_done) {
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hid_err(hid,
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"timeout waiting for response from ISHTP device\n");
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return -ETIMEDOUT;
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}
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hid_ishtp_trace(client_data, "%s hid %p done\n", __func__, hid);
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hid_data->request_done = false;
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return 0;
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}
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/**
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* ishtp_hid_wakeup() - Wakeup caller
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* @hid: hid device instance
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*
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* This function will wakeup caller waiting for Get/Set feature report
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*/
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void ishtp_hid_wakeup(struct hid_device *hid)
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{
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struct ishtp_hid_data *hid_data = hid->driver_data;
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hid_data->request_done = true;
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wake_up_interruptible(&hid_data->hid_wait);
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}
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static struct hid_ll_driver ishtp_hid_ll_driver = {
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.parse = ishtp_hid_parse,
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.start = ishtp_hid_start,
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.stop = ishtp_hid_stop,
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.open = ishtp_hid_open,
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.close = ishtp_hid_close,
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.request = ishtp_hid_request,
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.wait = ishtp_wait_for_response,
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.raw_request = ishtp_raw_request
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};
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/**
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* ishtp_hid_probe() - hid register ll driver
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* @cur_hid_dev: Index of hid device calling to register
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* @client_data: Client data pointer
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*
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* This function is used to allocate and add HID device.
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*
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* Return: 0 on success, non zero on error
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*/
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int ishtp_hid_probe(unsigned int cur_hid_dev,
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struct ishtp_cl_data *client_data)
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{
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int rv;
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struct hid_device *hid;
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struct ishtp_hid_data *hid_data;
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hid = hid_allocate_device();
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if (IS_ERR(hid)) {
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rv = PTR_ERR(hid);
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return -ENOMEM;
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}
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hid_data = kzalloc(sizeof(*hid_data), GFP_KERNEL);
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if (!hid_data) {
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rv = -ENOMEM;
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goto err_hid_data;
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}
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hid_data->index = cur_hid_dev;
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hid_data->client_data = client_data;
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init_waitqueue_head(&hid_data->hid_wait);
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hid->driver_data = hid_data;
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client_data->hid_sensor_hubs[cur_hid_dev] = hid;
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hid->ll_driver = &ishtp_hid_ll_driver;
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hid->bus = BUS_INTEL_ISHTP;
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hid->dev.parent = ishtp_device(client_data->cl_device);
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hid->version = le16_to_cpu(ISH_HID_VERSION);
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hid->vendor = le16_to_cpu(client_data->hid_devices[cur_hid_dev].vid);
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hid->product = le16_to_cpu(client_data->hid_devices[cur_hid_dev].pid);
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snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", "hid-ishtp",
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hid->vendor, hid->product);
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rv = hid_add_device(hid);
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if (rv)
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goto err_hid_device;
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hid_ishtp_trace(client_data, "%s allocated hid %p\n", __func__, hid);
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return 0;
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err_hid_device:
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kfree(hid_data);
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err_hid_data:
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hid_destroy_device(hid);
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return rv;
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}
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/**
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* ishtp_hid_probe() - Remove registered hid device
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* @client_data: client data pointer
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*
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* This function is used to destroy allocatd HID device.
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*/
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void ishtp_hid_remove(struct ishtp_cl_data *client_data)
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{
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int i;
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for (i = 0; i < client_data->num_hid_devices; ++i) {
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if (client_data->hid_sensor_hubs[i]) {
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kfree(client_data->hid_sensor_hubs[i]->driver_data);
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hid_destroy_device(client_data->hid_sensor_hubs[i]);
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client_data->hid_sensor_hubs[i] = NULL;
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}
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}
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}
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