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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 <Nehal-bakulchandra.shah@amd.com>
* Sandeep Singh <sandeep.singh@amd.com>
* Basavaraj Natikar <Basavaraj.Natikar@amd.com>
*/
#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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