1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * ISHTP-HID glue driver.
4  *
5  * Copyright (c) 2012-2016, Intel Corporation.
6  */
7 
8 #include <linux/hid.h>
9 #include <linux/intel-ish-client-if.h>
10 #include <uapi/linux/input.h>
11 #include "ishtp-hid.h"
12 
13 /**
14  * ishtp_hid_parse() - hid-core .parse() callback
15  * @hid:	hid device instance
16  *
17  * This function gets called during call to hid_add_device
18  *
19  * Return: 0 on success and non zero on error
20  */
ishtp_hid_parse(struct hid_device * hid)21 static int ishtp_hid_parse(struct hid_device *hid)
22 {
23 	struct ishtp_hid_data *hid_data =  hid->driver_data;
24 	struct ishtp_cl_data *client_data = hid_data->client_data;
25 	int rv;
26 
27 	rv = hid_parse_report(hid, client_data->report_descr[hid_data->index],
28 			      client_data->report_descr_size[hid_data->index]);
29 	if (rv)
30 		return	rv;
31 
32 	return 0;
33 }
34 
35 /* Empty callbacks with success return code */
ishtp_hid_start(struct hid_device * hid)36 static int ishtp_hid_start(struct hid_device *hid)
37 {
38 	return 0;
39 }
40 
ishtp_hid_stop(struct hid_device * hid)41 static void ishtp_hid_stop(struct hid_device *hid)
42 {
43 }
44 
ishtp_hid_open(struct hid_device * hid)45 static int ishtp_hid_open(struct hid_device *hid)
46 {
47 	return 0;
48 }
49 
ishtp_hid_close(struct hid_device * hid)50 static void ishtp_hid_close(struct hid_device *hid)
51 {
52 }
53 
ishtp_raw_request(struct hid_device * hid,unsigned char reportnum,__u8 * buf,size_t len,unsigned char rtype,int reqtype)54 static int ishtp_raw_request(struct hid_device *hid, unsigned char reportnum,
55 			     __u8 *buf, size_t len, unsigned char rtype,
56 			     int reqtype)
57 {
58 	struct ishtp_hid_data *hid_data =  hid->driver_data;
59 	char *ishtp_buf = NULL;
60 	size_t ishtp_buf_len;
61 	unsigned int header_size = sizeof(struct hostif_msg);
62 
63 	if (rtype == HID_OUTPUT_REPORT)
64 		return -EINVAL;
65 
66 	hid_data->request_done = false;
67 	switch (reqtype) {
68 	case HID_REQ_GET_REPORT:
69 		hid_data->raw_buf = buf;
70 		hid_data->raw_buf_size = len;
71 		hid_data->raw_get_req = true;
72 
73 		hid_ishtp_get_report(hid, reportnum, rtype);
74 		break;
75 	case HID_REQ_SET_REPORT:
76 		/*
77 		 * Spare 7 bytes for 64b accesses through
78 		 * get/put_unaligned_le64()
79 		 */
80 		ishtp_buf_len = len + header_size;
81 		ishtp_buf = kzalloc(ishtp_buf_len + 7, GFP_KERNEL);
82 		if (!ishtp_buf)
83 			return -ENOMEM;
84 
85 		memcpy(ishtp_buf + header_size, buf, len);
86 		hid_ishtp_set_feature(hid, ishtp_buf, ishtp_buf_len, reportnum);
87 		kfree(ishtp_buf);
88 		break;
89 	}
90 
91 	hid_hw_wait(hid);
92 
93 	return len;
94 }
95 
96 /**
97  * ishtp_hid_request() - hid-core .request() callback
98  * @hid:	hid device instance
99  * @rep:	pointer to hid_report
100  * @reqtype:	type of req. [GET|SET]_REPORT
101  *
102  * This function is used to set/get feaure/input report.
103  */
ishtp_hid_request(struct hid_device * hid,struct hid_report * rep,int reqtype)104 static void ishtp_hid_request(struct hid_device *hid, struct hid_report *rep,
105 	int reqtype)
106 {
107 	struct ishtp_hid_data *hid_data =  hid->driver_data;
108 	/* the specific report length, just HID part of it */
109 	unsigned int len = ((rep->size - 1) >> 3) + 1 + (rep->id > 0);
110 	char *buf;
111 	unsigned int header_size = sizeof(struct hostif_msg);
112 
113 	len += header_size;
114 
115 	hid_data->request_done = false;
116 	switch (reqtype) {
117 	case HID_REQ_GET_REPORT:
118 		hid_data->raw_get_req = false;
119 		hid_ishtp_get_report(hid, rep->id, rep->type);
120 		break;
121 	case HID_REQ_SET_REPORT:
122 		/*
123 		 * Spare 7 bytes for 64b accesses through
124 		 * get/put_unaligned_le64()
125 		 */
126 		buf = kzalloc(len + 7, GFP_KERNEL);
127 		if (!buf)
128 			return;
129 
130 		hid_output_report(rep, buf + header_size);
131 		hid_ishtp_set_feature(hid, buf, len, rep->id);
132 		kfree(buf);
133 		break;
134 	}
135 }
136 
137 /**
138  * ishtp_wait_for_response() - hid-core .wait() callback
139  * @hid:	hid device instance
140  *
141  * This function is used to wait after get feaure/input report.
142  *
143  * Return: 0 on success and non zero on error
144  */
ishtp_wait_for_response(struct hid_device * hid)145 static int ishtp_wait_for_response(struct hid_device *hid)
146 {
147 	struct ishtp_hid_data *hid_data =  hid->driver_data;
148 	int rv;
149 
150 	hid_ishtp_trace(client_data,  "%s hid %p\n", __func__, hid);
151 
152 	rv = ishtp_hid_link_ready_wait(hid_data->client_data);
153 	if (rv)
154 		return rv;
155 
156 	if (!hid_data->request_done)
157 		wait_event_interruptible_timeout(hid_data->hid_wait,
158 					hid_data->request_done, 3 * HZ);
159 
160 	if (!hid_data->request_done) {
161 		hid_err(hid,
162 			"timeout waiting for response from ISHTP device\n");
163 		return -ETIMEDOUT;
164 	}
165 	hid_ishtp_trace(client_data,  "%s hid %p done\n", __func__, hid);
166 
167 	hid_data->request_done = false;
168 
169 	return 0;
170 }
171 
172 /**
173  * ishtp_hid_wakeup() - Wakeup caller
174  * @hid:	hid device instance
175  *
176  * This function will wakeup caller waiting for Get/Set feature report
177  */
ishtp_hid_wakeup(struct hid_device * hid)178 void ishtp_hid_wakeup(struct hid_device *hid)
179 {
180 	struct ishtp_hid_data *hid_data = hid->driver_data;
181 
182 	hid_data->request_done = true;
183 	wake_up_interruptible(&hid_data->hid_wait);
184 }
185 
186 static const struct hid_ll_driver ishtp_hid_ll_driver = {
187 	.parse = ishtp_hid_parse,
188 	.start = ishtp_hid_start,
189 	.stop = ishtp_hid_stop,
190 	.open = ishtp_hid_open,
191 	.close = ishtp_hid_close,
192 	.request = ishtp_hid_request,
193 	.wait = ishtp_wait_for_response,
194 	.raw_request = ishtp_raw_request
195 };
196 
197 /**
198  * ishtp_hid_probe() - hid register ll driver
199  * @cur_hid_dev:	Index of hid device calling to register
200  * @client_data:	Client data pointer
201  *
202  * This function is used to allocate and add HID device.
203  *
204  * Return: 0 on success, non zero on error
205  */
ishtp_hid_probe(unsigned int cur_hid_dev,struct ishtp_cl_data * client_data)206 int ishtp_hid_probe(unsigned int cur_hid_dev,
207 		    struct ishtp_cl_data *client_data)
208 {
209 	int rv;
210 	struct hid_device *hid;
211 	struct ishtp_hid_data *hid_data;
212 
213 	hid = hid_allocate_device();
214 	if (IS_ERR(hid))
215 		return PTR_ERR(hid);
216 
217 	hid_data = kzalloc(sizeof(*hid_data), GFP_KERNEL);
218 	if (!hid_data) {
219 		rv = -ENOMEM;
220 		goto err_hid_data;
221 	}
222 
223 	hid_data->index = cur_hid_dev;
224 	hid_data->client_data = client_data;
225 	init_waitqueue_head(&hid_data->hid_wait);
226 
227 	hid->driver_data = hid_data;
228 
229 	client_data->hid_sensor_hubs[cur_hid_dev] = hid;
230 
231 	hid->ll_driver = &ishtp_hid_ll_driver;
232 	hid->bus = BUS_INTEL_ISHTP;
233 	hid->dev.parent = ishtp_device(client_data->cl_device);
234 
235 	hid->version = le16_to_cpu(ISH_HID_VERSION);
236 	hid->vendor = le16_to_cpu(client_data->hid_devices[cur_hid_dev].vid);
237 	hid->product = le16_to_cpu(client_data->hid_devices[cur_hid_dev].pid);
238 	snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", "hid-ishtp",
239 		hid->vendor, hid->product);
240 
241 	rv = hid_add_device(hid);
242 	if (rv)
243 		goto err_hid_device;
244 
245 	hid_ishtp_trace(client_data,  "%s allocated hid %p\n", __func__, hid);
246 
247 	return 0;
248 
249 err_hid_device:
250 	kfree(hid_data);
251 err_hid_data:
252 	hid_destroy_device(hid);
253 	return rv;
254 }
255 
256 /**
257  * ishtp_hid_remove() - Remove registered hid device
258  * @client_data:	client data pointer
259  *
260  * This function is used to destroy allocatd HID device.
261  */
ishtp_hid_remove(struct ishtp_cl_data * client_data)262 void ishtp_hid_remove(struct ishtp_cl_data *client_data)
263 {
264 	int i;
265 
266 	for (i = 0; i < client_data->num_hid_devices; ++i) {
267 		if (client_data->hid_sensor_hubs[i]) {
268 			kfree(client_data->hid_sensor_hubs[i]->driver_data);
269 			hid_destroy_device(client_data->hid_sensor_hubs[i]);
270 			client_data->hid_sensor_hubs[i] = NULL;
271 		}
272 	}
273 }
274