1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * AMD MP2 Sensors transport driver
5 * Authors: Nehal Bakulchandra Shah <Nehal-bakulchandra.shah@amd.com>
6 * Sandeep Singh <sandeep.singh@amd.com>
9 #include <linux/wait.h>
10 #include <linux/sched.h>
12 #include "amd_sfh_hid.h"
14 #define AMD_SFH_RESPONSE_TIMEOUT 1500
17 * amdtp_hid_parse() - hid-core .parse() callback
18 * @hid: hid device instance
20 * This function gets called during call to hid_add_device
22 * Return: 0 on success and non zero on error
24 static int amdtp_hid_parse(struct hid_device *hid)
26 struct amdtp_hid_data *hid_data = hid->driver_data;
27 struct amdtp_cl_data *cli_data = hid_data->cli_data;
29 return hid_parse_report(hid, cli_data->report_descr[hid_data->index],
30 cli_data->report_descr_sz[hid_data->index]);
33 /* Empty callbacks with success return code */
34 static int amdtp_hid_start(struct hid_device *hid)
39 static void amdtp_hid_stop(struct hid_device *hid)
43 static int amdtp_hid_open(struct hid_device *hid)
48 static void amdtp_hid_close(struct hid_device *hid)
52 static int amdtp_raw_request(struct hid_device *hdev, u8 reportnum,
53 u8 *buf, size_t len, u8 rtype, int reqtype)
58 static void amdtp_hid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)
63 case HID_REQ_GET_REPORT:
64 rc = amd_sfh_get_report(hid, rep->id, rep->type);
66 dev_err(&hid->dev, "AMDSFH get report error\n");
68 case HID_REQ_SET_REPORT:
69 amd_sfh_set_report(hid, rep->id, reqtype);
76 static int amdtp_wait_for_response(struct hid_device *hid)
78 struct amdtp_hid_data *hid_data = hid->driver_data;
79 struct amdtp_cl_data *cli_data = hid_data->cli_data;
82 for (i = 0; i < cli_data->num_hid_devices; i++) {
83 if (cli_data->hid_sensor_hubs[i] == hid)
87 if (!cli_data->request_done[i])
88 ret = wait_event_interruptible_timeout(hid_data->hid_wait,
89 cli_data->request_done[i],
90 msecs_to_jiffies(AMD_SFH_RESPONSE_TIMEOUT));
91 if (ret == -ERESTARTSYS)
99 void amdtp_hid_wakeup(struct hid_device *hid)
101 struct amdtp_hid_data *hid_data = hid->driver_data;
102 struct amdtp_cl_data *cli_data = hid_data->cli_data;
104 cli_data->request_done[cli_data->cur_hid_dev] = true;
105 wake_up_interruptible(&hid_data->hid_wait);
108 static struct hid_ll_driver amdtp_hid_ll_driver = {
109 .parse = amdtp_hid_parse,
110 .start = amdtp_hid_start,
111 .stop = amdtp_hid_stop,
112 .open = amdtp_hid_open,
113 .close = amdtp_hid_close,
114 .request = amdtp_hid_request,
115 .wait = amdtp_wait_for_response,
116 .raw_request = amdtp_raw_request,
119 int amdtp_hid_probe(u32 cur_hid_dev, struct amdtp_cl_data *cli_data)
121 struct hid_device *hid;
122 struct amdtp_hid_data *hid_data;
125 hid = hid_allocate_device();
129 hid_data = kzalloc(sizeof(*hid_data), GFP_KERNEL);
135 hid->ll_driver = &amdtp_hid_ll_driver;
136 hid_data->index = cur_hid_dev;
137 hid_data->cli_data = cli_data;
138 init_waitqueue_head(&hid_data->hid_wait);
140 hid->driver_data = hid_data;
141 cli_data->hid_sensor_hubs[cur_hid_dev] = hid;
142 hid->bus = BUS_AMD_AMDTP;
143 hid->vendor = AMD_SFH_HID_VENDOR;
144 hid->product = AMD_SFH_HID_PRODUCT;
145 snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", "hid-amdtp",
146 hid->vendor, hid->product);
148 rc = hid_add_device(hid);
156 hid_destroy_device(hid);
160 void amdtp_hid_remove(struct amdtp_cl_data *cli_data)
164 for (i = 0; i < cli_data->num_hid_devices; ++i) {
165 if (cli_data->hid_sensor_hubs[i]) {
166 kfree(cli_data->hid_sensor_hubs[i]->driver_data);
167 hid_destroy_device(cli_data->hid_sensor_hubs[i]);
168 cli_data->hid_sensor_hubs[i] = NULL;