1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * AMD MP2 Sensors transport driver
4  *
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	1500
18 
19 /**
20  * amdtp_hid_parse() - hid-core .parse() callback
21  * @hid:	hid device instance
22  *
23  * This function gets called during call to hid_add_device
24  *
25  * Return: 0 on success and non zero on error
26  */
27 static 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 */
37 static int amdtp_hid_start(struct hid_device *hid)
38 {
39 	return 0;
40 }
41 
42 static void amdtp_hid_stop(struct hid_device *hid)
43 {
44 }
45 
46 static int amdtp_hid_open(struct hid_device *hid)
47 {
48 	return 0;
49 }
50 
51 static void amdtp_hid_close(struct hid_device *hid)
52 {
53 }
54 
55 static 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 
61 static 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 
79 static 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 	else
99 		return 0;
100 }
101 
102 void 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 
115 static 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 
126 int 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 
164 err_hid_device:
165 	kfree(hid_data);
166 err_hid_data:
167 	hid_destroy_device(hid);
168 	return rc;
169 }
170 
171 void amdtp_hid_remove(struct amdtp_cl_data *cli_data)
172 {
173 	int i;
174 
175 	for (i = 0; i < cli_data->num_hid_devices; ++i) {
176 		if (cli_data->hid_sensor_hubs[i]) {
177 			kfree(cli_data->hid_sensor_hubs[i]->driver_data);
178 			hid_destroy_device(cli_data->hid_sensor_hubs[i]);
179 			cli_data->hid_sensor_hubs[i] = NULL;
180 		}
181 	}
182 }
183