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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * AMD MP2 Sensors transport driver
- *
- * Copyright 2020-2021 Advanced Micro Devices, Inc.
- * Authors: Nehal Bakulchandra Shah <[email protected]>
- * Sandeep Singh <[email protected]>
- * Basavaraj Natikar <[email protected]>
- */
- #include <linux/hid.h>
- #include <linux/wait.h>
- #include <linux/sched.h>
- #include "amd_sfh_hid.h"
- #include "amd_sfh_pcie.h"
- #define AMD_SFH_RESPONSE_TIMEOUT 1500
- /**
- * amdtp_hid_parse() - hid-core .parse() callback
- * @hid: hid device instance
- *
- * This function gets called during call to hid_add_device
- *
- * Return: 0 on success and non zero on error
- */
- static int amdtp_hid_parse(struct hid_device *hid)
- {
- struct amdtp_hid_data *hid_data = hid->driver_data;
- struct amdtp_cl_data *cli_data = hid_data->cli_data;
- return hid_parse_report(hid, cli_data->report_descr[hid_data->index],
- cli_data->report_descr_sz[hid_data->index]);
- }
- /* Empty callbacks with success return code */
- static int amdtp_hid_start(struct hid_device *hid)
- {
- return 0;
- }
- static void amdtp_hid_stop(struct hid_device *hid)
- {
- }
- static int amdtp_hid_open(struct hid_device *hid)
- {
- return 0;
- }
- static void amdtp_hid_close(struct hid_device *hid)
- {
- }
- static int amdtp_raw_request(struct hid_device *hdev, u8 reportnum,
- u8 *buf, size_t len, u8 rtype, int reqtype)
- {
- return 0;
- }
- static void amdtp_hid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)
- {
- int rc;
- switch (reqtype) {
- case HID_REQ_GET_REPORT:
- rc = amd_sfh_get_report(hid, rep->id, rep->type);
- if (rc)
- dev_err(&hid->dev, "AMDSFH get report error\n");
- break;
- case HID_REQ_SET_REPORT:
- amd_sfh_set_report(hid, rep->id, reqtype);
- break;
- default:
- break;
- }
- }
- static int amdtp_wait_for_response(struct hid_device *hid)
- {
- struct amdtp_hid_data *hid_data = hid->driver_data;
- struct amdtp_cl_data *cli_data = hid_data->cli_data;
- int i, ret = 0;
- for (i = 0; i < cli_data->num_hid_devices; i++) {
- if (cli_data->hid_sensor_hubs[i] == hid)
- break;
- }
- if (!cli_data->request_done[i])
- ret = wait_event_interruptible_timeout(hid_data->hid_wait,
- cli_data->request_done[i],
- msecs_to_jiffies(AMD_SFH_RESPONSE_TIMEOUT));
- if (ret == -ERESTARTSYS)
- return -ERESTARTSYS;
- else if (ret < 0)
- return -ETIMEDOUT;
- else
- return 0;
- }
- void amdtp_hid_wakeup(struct hid_device *hid)
- {
- struct amdtp_hid_data *hid_data;
- struct amdtp_cl_data *cli_data;
- if (hid) {
- hid_data = hid->driver_data;
- cli_data = hid_data->cli_data;
- cli_data->request_done[cli_data->cur_hid_dev] = true;
- wake_up_interruptible(&hid_data->hid_wait);
- }
- }
- static struct hid_ll_driver amdtp_hid_ll_driver = {
- .parse = amdtp_hid_parse,
- .start = amdtp_hid_start,
- .stop = amdtp_hid_stop,
- .open = amdtp_hid_open,
- .close = amdtp_hid_close,
- .request = amdtp_hid_request,
- .wait = amdtp_wait_for_response,
- .raw_request = amdtp_raw_request,
- };
- int amdtp_hid_probe(u32 cur_hid_dev, struct amdtp_cl_data *cli_data)
- {
- struct amd_mp2_dev *mp2 = container_of(cli_data->in_data, struct amd_mp2_dev, in_data);
- struct device *dev = &mp2->pdev->dev;
- struct hid_device *hid;
- struct amdtp_hid_data *hid_data;
- int rc;
- hid = hid_allocate_device();
- if (IS_ERR(hid))
- return PTR_ERR(hid);
- hid_data = kzalloc(sizeof(*hid_data), GFP_KERNEL);
- if (!hid_data) {
- rc = -ENOMEM;
- goto err_hid_data;
- }
- hid->ll_driver = &amdtp_hid_ll_driver;
- hid_data->index = cur_hid_dev;
- hid_data->cli_data = cli_data;
- init_waitqueue_head(&hid_data->hid_wait);
- hid->driver_data = hid_data;
- cli_data->hid_sensor_hubs[cur_hid_dev] = hid;
- strscpy(hid->phys, dev->driver ? dev->driver->name : dev_name(dev),
- sizeof(hid->phys));
- hid->bus = BUS_AMD_SFH;
- hid->vendor = AMD_SFH_HID_VENDOR;
- hid->product = AMD_SFH_HID_PRODUCT;
- snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", "hid-amdsfh",
- hid->vendor, hid->product);
- rc = hid_add_device(hid);
- if (rc)
- goto err_hid_device;
- return 0;
- err_hid_device:
- kfree(hid_data);
- err_hid_data:
- hid_destroy_device(hid);
- return rc;
- }
- void amdtp_hid_remove(struct amdtp_cl_data *cli_data)
- {
- int i;
- for (i = 0; i < cli_data->num_hid_devices; ++i) {
- if (cli_data->hid_sensor_hubs[i]) {
- kfree(cli_data->hid_sensor_hubs[i]->driver_data);
- hid_destroy_device(cli_data->hid_sensor_hubs[i]);
- cli_data->hid_sensor_hubs[i] = NULL;
- }
- }
- }
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