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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * AMD MP2 Sensors transport driver4 *5 * Copyright 2020-2021 Advanced Micro Devices, Inc.6 * Authors: Nehal Bakulchandra Shah <Nehal-bakulchandra.shah@amd.com>7 * Sandeep Singh <sandeep.singh@amd.com>8 * Basavaraj Natikar <Basavaraj.Natikar@amd.com>9 */10#include <linux/hid.h>11#include <linux/wait.h>12#include <linux/sched.h>13 14#include "amd_sfh_hid.h"15#include "amd_sfh_pcie.h"16 17#define AMD_SFH_RESPONSE_TIMEOUT 150018 19/**20 * amdtp_hid_parse() - hid-core .parse() callback21 * @hid: hid device instance22 *23 * This function gets called during call to hid_add_device24 *25 * Return: 0 on success and non zero on error26 */27static int amdtp_hid_parse(struct hid_device *hid)28{29 struct amdtp_hid_data *hid_data = hid->driver_data;30 struct amdtp_cl_data *cli_data = hid_data->cli_data;31 32 return hid_parse_report(hid, cli_data->report_descr[hid_data->index],33 cli_data->report_descr_sz[hid_data->index]);34}35 36/* Empty callbacks with success return code */37static int amdtp_hid_start(struct hid_device *hid)38{39 return 0;40}41 42static void amdtp_hid_stop(struct hid_device *hid)43{44}45 46static int amdtp_hid_open(struct hid_device *hid)47{48 return 0;49}50 51static void amdtp_hid_close(struct hid_device *hid)52{53}54 55static int amdtp_raw_request(struct hid_device *hdev, u8 reportnum,56 u8 *buf, size_t len, u8 rtype, int reqtype)57{58 return 0;59}60 61static void amdtp_hid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)62{63 int rc;64 65 switch (reqtype) {66 case HID_REQ_GET_REPORT:67 rc = amd_sfh_get_report(hid, rep->id, rep->type);68 if (rc)69 dev_err(&hid->dev, "AMDSFH get report error\n");70 break;71 case HID_REQ_SET_REPORT:72 amd_sfh_set_report(hid, rep->id, reqtype);73 break;74 default:75 break;76 }77}78 79static int amdtp_wait_for_response(struct hid_device *hid)80{81 struct amdtp_hid_data *hid_data = hid->driver_data;82 struct amdtp_cl_data *cli_data = hid_data->cli_data;83 int i, ret = 0;84 85 for (i = 0; i < cli_data->num_hid_devices; i++) {86 if (cli_data->hid_sensor_hubs[i] == hid)87 break;88 }89 90 if (!cli_data->request_done[i])91 ret = wait_event_interruptible_timeout(hid_data->hid_wait,92 cli_data->request_done[i],93 msecs_to_jiffies(AMD_SFH_RESPONSE_TIMEOUT));94 if (ret == -ERESTARTSYS)95 return -ERESTARTSYS;96 else if (ret < 0)97 return -ETIMEDOUT;98 else99 return 0;100}101 102void amdtp_hid_wakeup(struct hid_device *hid)103{104 struct amdtp_hid_data *hid_data;105 struct amdtp_cl_data *cli_data;106 107 if (hid) {108 hid_data = hid->driver_data;109 cli_data = hid_data->cli_data;110 cli_data->request_done[cli_data->cur_hid_dev] = true;111 wake_up_interruptible(&hid_data->hid_wait);112 }113}114 115static const struct hid_ll_driver amdtp_hid_ll_driver = {116 .parse = amdtp_hid_parse,117 .start = amdtp_hid_start,118 .stop = amdtp_hid_stop,119 .open = amdtp_hid_open,120 .close = amdtp_hid_close,121 .request = amdtp_hid_request,122 .wait = amdtp_wait_for_response,123 .raw_request = amdtp_raw_request,124};125 126int amdtp_hid_probe(u32 cur_hid_dev, struct amdtp_cl_data *cli_data)127{128 struct amd_mp2_dev *mp2 = container_of(cli_data->in_data, struct amd_mp2_dev, in_data);129 struct device *dev = &mp2->pdev->dev;130 struct hid_device *hid;131 struct amdtp_hid_data *hid_data;132 int rc;133 134 hid = hid_allocate_device();135 if (IS_ERR(hid))136 return PTR_ERR(hid);137 138 hid_data = kzalloc(sizeof(*hid_data), GFP_KERNEL);139 if (!hid_data) {140 rc = -ENOMEM;141 goto err_hid_data;142 }143 144 hid->ll_driver = &amdtp_hid_ll_driver;145 hid_data->index = cur_hid_dev;146 hid_data->cli_data = cli_data;147 init_waitqueue_head(&hid_data->hid_wait);148 149 hid->driver_data = hid_data;150 cli_data->hid_sensor_hubs[cur_hid_dev] = hid;151 strscpy(hid->phys, dev->driver ? dev->driver->name : dev_name(dev),152 sizeof(hid->phys));153 hid->bus = BUS_AMD_SFH;154 hid->vendor = AMD_SFH_HID_VENDOR;155 hid->product = AMD_SFH_HID_PRODUCT;156 snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", "hid-amdsfh",157 hid->vendor, hid->product);158 159 rc = hid_add_device(hid);160 if (rc)161 goto err_hid_device;162 return 0;163 164err_hid_device:165 kfree(hid_data);166err_hid_data:167 hid_destroy_device(hid);168 return rc;169}170 171void amdtp_hid_remove(struct amdtp_cl_data *cli_data)172{173 int i;174 struct amdtp_hid_data *hid_data;175 176 for (i = 0; i < cli_data->num_hid_devices; ++i) {177 if (cli_data->hid_sensor_hubs[i]) {178 hid_data = cli_data->hid_sensor_hubs[i]->driver_data;179 hid_destroy_device(cli_data->hid_sensor_hubs[i]);180 kfree(hid_data);181 cli_data->hid_sensor_hubs[i] = NULL;182 }183 }184}185