forked from luck/tmp_suning_uos_patched
0b28cb4bcb
This driver is responsible for implementing ISH HID client, which gets HID description and report. Once it has completely gets report descriptors, it registers as a HID LL drivers. This implements necessary callbacks so that it can be used by HID sensor hub driver. Original-author: Daniel Drubin <daniel.drubin@intel.com> Reviewed-and-tested-by: Ooi, Joyce <joyce.ooi@intel.com> Tested-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Rann Bar-On <rb6@duke.edu> Tested-by: Atri Bhattacharya <badshah400@aim.com> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
247 lines
5.9 KiB
C
247 lines
5.9 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/hid.h>
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#include <uapi/linux/input.h>
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#include "ishtp/client.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 *hdev, unsigned char reportnum,
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__u8 *buf, size_t len, unsigned char rtype, int reqtype)
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{
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return 0;
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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_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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struct ishtp_cl_data *client_data = hid_data->client_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 = &client_data->cl_device->dev;
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hid->version = le16_to_cpu(ISH_HID_VERSION);
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hid->vendor = le16_to_cpu(ISH_HID_VENDOR);
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hid->product = le16_to_cpu(ISH_HID_PRODUCT);
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snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX", "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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kfree(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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