1 /*
2  * ISHTP client driver for HID (ISH)
3  *
4  * Copyright (c) 2014-2016, Intel Corporation.
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms and conditions of the GNU General Public License,
8  * version 2, as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13  * more details.
14  */
15 
16 #include <linux/module.h>
17 #include <linux/hid.h>
18 #include <linux/intel-ish-client-if.h>
19 #include <linux/sched.h>
20 #include "ishtp-hid.h"
21 
22 /* Rx ring buffer pool size */
23 #define HID_CL_RX_RING_SIZE	32
24 #define HID_CL_TX_RING_SIZE	16
25 
26 #define cl_data_to_dev(client_data) ishtp_device(client_data->cl_device)
27 
28 /**
29  * report_bad_packets() - Report bad packets
30  * @hid_ishtp_cl:	Client instance to get stats
31  * @recv_buf:		Raw received host interface message
32  * @cur_pos:		Current position index in payload
33  * @payload_len:	Length of payload expected
34  *
35  * Dumps error in case bad packet is received
36  */
37 static void report_bad_packet(struct ishtp_cl *hid_ishtp_cl, void *recv_buf,
38 			      size_t cur_pos,  size_t payload_len)
39 {
40 	struct hostif_msg *recv_msg = recv_buf;
41 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
42 
43 	dev_err(cl_data_to_dev(client_data), "[hid-ish]: BAD packet %02X\n"
44 		"total_bad=%u cur_pos=%u\n"
45 		"[%02X %02X %02X %02X]\n"
46 		"payload_len=%u\n"
47 		"multi_packet_cnt=%u\n"
48 		"is_response=%02X\n",
49 		recv_msg->hdr.command, client_data->bad_recv_cnt,
50 		(unsigned int)cur_pos,
51 		((unsigned char *)recv_msg)[0], ((unsigned char *)recv_msg)[1],
52 		((unsigned char *)recv_msg)[2], ((unsigned char *)recv_msg)[3],
53 		(unsigned int)payload_len, client_data->multi_packet_cnt,
54 		recv_msg->hdr.command & ~CMD_MASK);
55 }
56 
57 /**
58  * process_recv() - Received and parse incoming packet
59  * @hid_ishtp_cl:	Client instance to get stats
60  * @recv_buf:		Raw received host interface message
61  * @data_len:		length of the message
62  *
63  * Parse the incoming packet. If it is a response packet then it will update
64  * per instance flags and wake up the caller waiting to for the response.
65  */
66 static void process_recv(struct ishtp_cl *hid_ishtp_cl, void *recv_buf,
67 			 size_t data_len)
68 {
69 	struct hostif_msg *recv_msg;
70 	unsigned char *payload;
71 	struct device_info *dev_info;
72 	int i, j;
73 	size_t	payload_len, total_len, cur_pos, raw_len;
74 	int report_type;
75 	struct report_list *reports_list;
76 	char *reports;
77 	size_t report_len;
78 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
79 	int curr_hid_dev = client_data->cur_hid_dev;
80 	struct ishtp_hid_data *hid_data = NULL;
81 	struct hid_device *hid = NULL;
82 
83 	payload = recv_buf + sizeof(struct hostif_msg_hdr);
84 	total_len = data_len;
85 	cur_pos = 0;
86 
87 	do {
88 		if (cur_pos + sizeof(struct hostif_msg) > total_len) {
89 			dev_err(cl_data_to_dev(client_data),
90 				"[hid-ish]: error, received %u which is less than data header %u\n",
91 				(unsigned int)data_len,
92 				(unsigned int)sizeof(struct hostif_msg_hdr));
93 			++client_data->bad_recv_cnt;
94 			ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
95 			break;
96 		}
97 
98 		recv_msg = (struct hostif_msg *)(recv_buf + cur_pos);
99 		payload_len = recv_msg->hdr.size;
100 
101 		/* Sanity checks */
102 		if (cur_pos + payload_len + sizeof(struct hostif_msg) >
103 				total_len) {
104 			++client_data->bad_recv_cnt;
105 			report_bad_packet(hid_ishtp_cl, recv_msg, cur_pos,
106 					  payload_len);
107 			ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
108 			break;
109 		}
110 
111 		hid_ishtp_trace(client_data,  "%s %d\n",
112 				__func__, recv_msg->hdr.command & CMD_MASK);
113 
114 		switch (recv_msg->hdr.command & CMD_MASK) {
115 		case HOSTIF_DM_ENUM_DEVICES:
116 			if ((!(recv_msg->hdr.command & ~CMD_MASK) ||
117 					client_data->init_done)) {
118 				++client_data->bad_recv_cnt;
119 				report_bad_packet(hid_ishtp_cl, recv_msg,
120 						  cur_pos,
121 						  payload_len);
122 				ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
123 				break;
124 			}
125 			client_data->hid_dev_count = (unsigned int)*payload;
126 			if (!client_data->hid_devices)
127 				client_data->hid_devices = devm_kcalloc(
128 						cl_data_to_dev(client_data),
129 						client_data->hid_dev_count,
130 						sizeof(struct device_info),
131 						GFP_KERNEL);
132 			if (!client_data->hid_devices) {
133 				dev_err(cl_data_to_dev(client_data),
134 				"Mem alloc failed for hid device info\n");
135 				wake_up_interruptible(&client_data->init_wait);
136 				break;
137 			}
138 			for (i = 0; i < client_data->hid_dev_count; ++i) {
139 				if (1 + sizeof(struct device_info) * i >=
140 						payload_len) {
141 					dev_err(cl_data_to_dev(client_data),
142 						"[hid-ish]: [ENUM_DEVICES]: content size %zu is bigger than payload_len %zu\n",
143 						1 + sizeof(struct device_info)
144 						* i, payload_len);
145 				}
146 
147 				if (1 + sizeof(struct device_info) * i >=
148 						data_len)
149 					break;
150 
151 				dev_info = (struct device_info *)(payload + 1 +
152 					sizeof(struct device_info) * i);
153 				if (client_data->hid_devices)
154 					memcpy(client_data->hid_devices + i,
155 					       dev_info,
156 					       sizeof(struct device_info));
157 			}
158 
159 			client_data->enum_devices_done = true;
160 			wake_up_interruptible(&client_data->init_wait);
161 
162 			break;
163 
164 		case HOSTIF_GET_HID_DESCRIPTOR:
165 			if ((!(recv_msg->hdr.command & ~CMD_MASK) ||
166 					client_data->init_done)) {
167 				++client_data->bad_recv_cnt;
168 				report_bad_packet(hid_ishtp_cl, recv_msg,
169 						  cur_pos,
170 						  payload_len);
171 				ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
172 				break;
173 			}
174 			if (!client_data->hid_descr[curr_hid_dev])
175 				client_data->hid_descr[curr_hid_dev] =
176 				devm_kmalloc(cl_data_to_dev(client_data),
177 					     payload_len, GFP_KERNEL);
178 			if (client_data->hid_descr[curr_hid_dev]) {
179 				memcpy(client_data->hid_descr[curr_hid_dev],
180 				       payload, payload_len);
181 				client_data->hid_descr_size[curr_hid_dev] =
182 					payload_len;
183 				client_data->hid_descr_done = true;
184 			}
185 			wake_up_interruptible(&client_data->init_wait);
186 
187 			break;
188 
189 		case HOSTIF_GET_REPORT_DESCRIPTOR:
190 			if ((!(recv_msg->hdr.command & ~CMD_MASK) ||
191 					client_data->init_done)) {
192 				++client_data->bad_recv_cnt;
193 				report_bad_packet(hid_ishtp_cl, recv_msg,
194 						  cur_pos,
195 						  payload_len);
196 				ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
197 				break;
198 			}
199 			if (!client_data->report_descr[curr_hid_dev])
200 				client_data->report_descr[curr_hid_dev] =
201 				devm_kmalloc(cl_data_to_dev(client_data),
202 					     payload_len, GFP_KERNEL);
203 			if (client_data->report_descr[curr_hid_dev])  {
204 				memcpy(client_data->report_descr[curr_hid_dev],
205 				       payload,
206 				       payload_len);
207 				client_data->report_descr_size[curr_hid_dev] =
208 					payload_len;
209 				client_data->report_descr_done = true;
210 			}
211 			wake_up_interruptible(&client_data->init_wait);
212 
213 			break;
214 
215 		case HOSTIF_GET_FEATURE_REPORT:
216 			report_type = HID_FEATURE_REPORT;
217 			goto	do_get_report;
218 
219 		case HOSTIF_GET_INPUT_REPORT:
220 			report_type = HID_INPUT_REPORT;
221 do_get_report:
222 			/* Get index of device that matches this id */
223 			for (i = 0; i < client_data->num_hid_devices; ++i) {
224 				if (recv_msg->hdr.device_id ==
225 					  client_data->hid_devices[i].dev_id) {
226 					hid = client_data->hid_sensor_hubs[i];
227 					if (!hid)
228 						break;
229 
230 					hid_data = hid->driver_data;
231 					if (hid_data->raw_get_req) {
232 						raw_len =
233 						  (hid_data->raw_buf_size <
234 								payload_len) ?
235 						  hid_data->raw_buf_size :
236 						  payload_len;
237 
238 						memcpy(hid_data->raw_buf,
239 						       payload, raw_len);
240 					} else {
241 						hid_input_report
242 							(hid, report_type,
243 							 payload, payload_len,
244 							 0);
245 					}
246 
247 					ishtp_hid_wakeup(hid);
248 					break;
249 				}
250 			}
251 			break;
252 
253 		case HOSTIF_SET_FEATURE_REPORT:
254 			/* Get index of device that matches this id */
255 			for (i = 0; i < client_data->num_hid_devices; ++i) {
256 				if (recv_msg->hdr.device_id ==
257 					client_data->hid_devices[i].dev_id)
258 					if (client_data->hid_sensor_hubs[i]) {
259 						ishtp_hid_wakeup(
260 						client_data->hid_sensor_hubs[
261 							i]);
262 						break;
263 					}
264 			}
265 			break;
266 
267 		case HOSTIF_PUBLISH_INPUT_REPORT:
268 			report_type = HID_INPUT_REPORT;
269 			for (i = 0; i < client_data->num_hid_devices; ++i)
270 				if (recv_msg->hdr.device_id ==
271 					client_data->hid_devices[i].dev_id)
272 					if (client_data->hid_sensor_hubs[i])
273 						hid_input_report(
274 						client_data->hid_sensor_hubs[
275 									i],
276 						report_type, payload,
277 						payload_len, 0);
278 			break;
279 
280 		case HOSTIF_PUBLISH_INPUT_REPORT_LIST:
281 			report_type = HID_INPUT_REPORT;
282 			reports_list = (struct report_list *)payload;
283 			reports = (char *)reports_list->reports;
284 
285 			for (j = 0; j < reports_list->num_of_reports; j++) {
286 				recv_msg = (struct hostif_msg *)(reports +
287 					sizeof(uint16_t));
288 				report_len = *(uint16_t *)reports;
289 				payload = reports + sizeof(uint16_t) +
290 					sizeof(struct hostif_msg_hdr);
291 				payload_len = report_len -
292 					sizeof(struct hostif_msg_hdr);
293 
294 				for (i = 0; i < client_data->num_hid_devices;
295 				     ++i)
296 					if (recv_msg->hdr.device_id ==
297 					client_data->hid_devices[i].dev_id &&
298 					client_data->hid_sensor_hubs[i]) {
299 						hid_input_report(
300 						client_data->hid_sensor_hubs[
301 									i],
302 						report_type,
303 						payload, payload_len,
304 						0);
305 					}
306 
307 				reports += sizeof(uint16_t) + report_len;
308 			}
309 			break;
310 		default:
311 			++client_data->bad_recv_cnt;
312 			report_bad_packet(hid_ishtp_cl, recv_msg, cur_pos,
313 					  payload_len);
314 			ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
315 			break;
316 
317 		}
318 
319 		if (!cur_pos && cur_pos + payload_len +
320 				sizeof(struct hostif_msg) < total_len)
321 			++client_data->multi_packet_cnt;
322 
323 		cur_pos += payload_len + sizeof(struct hostif_msg);
324 		payload += payload_len + sizeof(struct hostif_msg);
325 
326 	} while (cur_pos < total_len);
327 }
328 
329 /**
330  * ish_cl_event_cb() - bus driver callback for incoming message/packet
331  * @device:	Pointer to the the ishtp client device for which this message
332  *		is targeted
333  *
334  * Remove the packet from the list and process the message by calling
335  * process_recv
336  */
337 static void ish_cl_event_cb(struct ishtp_cl_device *device)
338 {
339 	struct ishtp_cl	*hid_ishtp_cl = ishtp_get_drvdata(device);
340 	struct ishtp_cl_rb *rb_in_proc;
341 	size_t r_length;
342 
343 	if (!hid_ishtp_cl)
344 		return;
345 
346 	while ((rb_in_proc = ishtp_cl_rx_get_rb(hid_ishtp_cl)) != NULL) {
347 		if (!rb_in_proc->buffer.data)
348 			return;
349 
350 		r_length = rb_in_proc->buf_idx;
351 
352 		/* decide what to do with received data */
353 		process_recv(hid_ishtp_cl, rb_in_proc->buffer.data, r_length);
354 
355 		ishtp_cl_io_rb_recycle(rb_in_proc);
356 	}
357 }
358 
359 /**
360  * hid_ishtp_set_feature() - send request to ISH FW to set a feature request
361  * @hid:	hid device instance for this request
362  * @buf:	feature buffer
363  * @len:	Length of feature buffer
364  * @report_id:	Report id for the feature set request
365  *
366  * This is called from hid core .request() callback. This function doesn't wait
367  * for response.
368  */
369 void hid_ishtp_set_feature(struct hid_device *hid, char *buf, unsigned int len,
370 			   int report_id)
371 {
372 	struct ishtp_hid_data *hid_data =  hid->driver_data;
373 	struct ishtp_cl_data *client_data = hid_data->client_data;
374 	struct hostif_msg *msg = (struct hostif_msg *)buf;
375 	int	rv;
376 	int	i;
377 
378 	hid_ishtp_trace(client_data,  "%s hid %p\n", __func__, hid);
379 
380 	rv = ishtp_hid_link_ready_wait(client_data);
381 	if (rv) {
382 		hid_ishtp_trace(client_data,  "%s hid %p link not ready\n",
383 				__func__, hid);
384 		return;
385 	}
386 
387 	memset(msg, 0, sizeof(struct hostif_msg));
388 	msg->hdr.command = HOSTIF_SET_FEATURE_REPORT;
389 	for (i = 0; i < client_data->num_hid_devices; ++i) {
390 		if (hid == client_data->hid_sensor_hubs[i]) {
391 			msg->hdr.device_id =
392 				client_data->hid_devices[i].dev_id;
393 			break;
394 		}
395 	}
396 
397 	if (i == client_data->num_hid_devices)
398 		return;
399 
400 	rv = ishtp_cl_send(client_data->hid_ishtp_cl, buf, len);
401 	if (rv)
402 		hid_ishtp_trace(client_data,  "%s hid %p send failed\n",
403 				__func__, hid);
404 }
405 
406 /**
407  * hid_ishtp_get_report() - request to get feature/input report
408  * @hid:	hid device instance for this request
409  * @report_id:	Report id for the get request
410  * @report_type:	Report type for the this request
411  *
412  * This is called from hid core .request() callback. This function will send
413  * request to FW and return without waiting for response.
414  */
415 void hid_ishtp_get_report(struct hid_device *hid, int report_id,
416 			  int report_type)
417 {
418 	struct ishtp_hid_data *hid_data =  hid->driver_data;
419 	struct ishtp_cl_data *client_data = hid_data->client_data;
420 	struct hostif_msg_to_sensor msg = {};
421 	int	rv;
422 	int	i;
423 
424 	hid_ishtp_trace(client_data,  "%s hid %p\n", __func__, hid);
425 	rv = ishtp_hid_link_ready_wait(client_data);
426 	if (rv) {
427 		hid_ishtp_trace(client_data,  "%s hid %p link not ready\n",
428 				__func__, hid);
429 		return;
430 	}
431 
432 	msg.hdr.command = (report_type == HID_FEATURE_REPORT) ?
433 		HOSTIF_GET_FEATURE_REPORT : HOSTIF_GET_INPUT_REPORT;
434 	for (i = 0; i < client_data->num_hid_devices; ++i) {
435 		if (hid == client_data->hid_sensor_hubs[i]) {
436 			msg.hdr.device_id =
437 				client_data->hid_devices[i].dev_id;
438 			break;
439 		}
440 	}
441 
442 	if (i == client_data->num_hid_devices)
443 		return;
444 
445 	msg.report_id = report_id;
446 	rv = ishtp_cl_send(client_data->hid_ishtp_cl, (uint8_t *)&msg,
447 			    sizeof(msg));
448 	if (rv)
449 		hid_ishtp_trace(client_data,  "%s hid %p send failed\n",
450 				__func__, hid);
451 }
452 
453 /**
454  * ishtp_hid_link_ready_wait() - Wait for link ready
455  * @client_data:	client data instance
456  *
457  * If the transport link started suspend process, then wait, till either
458  * resumed or timeout
459  *
460  * Return: 0 on success, non zero on error
461  */
462 int ishtp_hid_link_ready_wait(struct ishtp_cl_data *client_data)
463 {
464 	int rc;
465 
466 	if (client_data->suspended) {
467 		hid_ishtp_trace(client_data,  "wait for link ready\n");
468 		rc = wait_event_interruptible_timeout(
469 					client_data->ishtp_resume_wait,
470 					!client_data->suspended,
471 					5 * HZ);
472 
473 		if (rc == 0) {
474 			hid_ishtp_trace(client_data,  "link not ready\n");
475 			return -EIO;
476 		}
477 		hid_ishtp_trace(client_data,  "link ready\n");
478 	}
479 
480 	return 0;
481 }
482 
483 /**
484  * ishtp_enum_enum_devices() - Enumerate hid devices
485  * @hid_ishtp_cl:	client instance
486  *
487  * Helper function to send request to firmware to enumerate HID devices
488  *
489  * Return: 0 on success, non zero on error
490  */
491 static int ishtp_enum_enum_devices(struct ishtp_cl *hid_ishtp_cl)
492 {
493 	struct hostif_msg msg;
494 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
495 	int retry_count;
496 	int rv;
497 
498 	/* Send HOSTIF_DM_ENUM_DEVICES */
499 	memset(&msg, 0, sizeof(struct hostif_msg));
500 	msg.hdr.command = HOSTIF_DM_ENUM_DEVICES;
501 	rv = ishtp_cl_send(hid_ishtp_cl, (unsigned char *)&msg,
502 			   sizeof(struct hostif_msg));
503 	if (rv)
504 		return rv;
505 
506 	retry_count = 0;
507 	while (!client_data->enum_devices_done &&
508 	       retry_count < 10) {
509 		wait_event_interruptible_timeout(client_data->init_wait,
510 					 client_data->enum_devices_done,
511 					 3 * HZ);
512 		++retry_count;
513 		if (!client_data->enum_devices_done)
514 			/* Send HOSTIF_DM_ENUM_DEVICES */
515 			rv = ishtp_cl_send(hid_ishtp_cl,
516 					   (unsigned char *) &msg,
517 					   sizeof(struct hostif_msg));
518 	}
519 	if (!client_data->enum_devices_done) {
520 		dev_err(cl_data_to_dev(client_data),
521 			"[hid-ish]: timed out waiting for enum_devices\n");
522 		return -ETIMEDOUT;
523 	}
524 	if (!client_data->hid_devices) {
525 		dev_err(cl_data_to_dev(client_data),
526 			"[hid-ish]: failed to allocate HID dev structures\n");
527 		return -ENOMEM;
528 	}
529 
530 	client_data->num_hid_devices = client_data->hid_dev_count;
531 	dev_info(ishtp_device(client_data->cl_device),
532 		"[hid-ish]: enum_devices_done OK, num_hid_devices=%d\n",
533 		client_data->num_hid_devices);
534 
535 	return	0;
536 }
537 
538 /**
539  * ishtp_get_hid_descriptor() - Get hid descriptor
540  * @hid_ishtp_cl:	client instance
541  * @index:		Index into the hid_descr array
542  *
543  * Helper function to send request to firmware get HID descriptor of a device
544  *
545  * Return: 0 on success, non zero on error
546  */
547 static int ishtp_get_hid_descriptor(struct ishtp_cl *hid_ishtp_cl, int index)
548 {
549 	struct hostif_msg msg;
550 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
551 	int rv;
552 
553 	/* Get HID descriptor */
554 	client_data->hid_descr_done = false;
555 	memset(&msg, 0, sizeof(struct hostif_msg));
556 	msg.hdr.command = HOSTIF_GET_HID_DESCRIPTOR;
557 	msg.hdr.device_id = client_data->hid_devices[index].dev_id;
558 	rv = ishtp_cl_send(hid_ishtp_cl, (unsigned char *) &msg,
559 			   sizeof(struct hostif_msg));
560 	if (rv)
561 		return rv;
562 
563 	if (!client_data->hid_descr_done) {
564 		wait_event_interruptible_timeout(client_data->init_wait,
565 						 client_data->hid_descr_done,
566 						 3 * HZ);
567 		if (!client_data->hid_descr_done) {
568 			dev_err(cl_data_to_dev(client_data),
569 				"[hid-ish]: timed out for hid_descr_done\n");
570 			return -EIO;
571 		}
572 
573 		if (!client_data->hid_descr[index]) {
574 			dev_err(cl_data_to_dev(client_data),
575 				"[hid-ish]: allocation HID desc fail\n");
576 			return -ENOMEM;
577 		}
578 	}
579 
580 	return 0;
581 }
582 
583 /**
584  * ishtp_get_report_descriptor() - Get report descriptor
585  * @hid_ishtp_cl:	client instance
586  * @index:		Index into the hid_descr array
587  *
588  * Helper function to send request to firmware get HID report descriptor of
589  * a device
590  *
591  * Return: 0 on success, non zero on error
592  */
593 static int ishtp_get_report_descriptor(struct ishtp_cl *hid_ishtp_cl,
594 				       int index)
595 {
596 	struct hostif_msg msg;
597 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
598 	int rv;
599 
600 	/* Get report descriptor */
601 	client_data->report_descr_done = false;
602 	memset(&msg, 0, sizeof(struct hostif_msg));
603 	msg.hdr.command = HOSTIF_GET_REPORT_DESCRIPTOR;
604 	msg.hdr.device_id = client_data->hid_devices[index].dev_id;
605 	rv = ishtp_cl_send(hid_ishtp_cl, (unsigned char *) &msg,
606 			   sizeof(struct hostif_msg));
607 	if (rv)
608 		return rv;
609 
610 	if (!client_data->report_descr_done)
611 		wait_event_interruptible_timeout(client_data->init_wait,
612 					 client_data->report_descr_done,
613 					 3 * HZ);
614 	if (!client_data->report_descr_done) {
615 		dev_err(cl_data_to_dev(client_data),
616 				"[hid-ish]: timed out for report descr\n");
617 		return -EIO;
618 	}
619 	if (!client_data->report_descr[index]) {
620 		dev_err(cl_data_to_dev(client_data),
621 			"[hid-ish]: failed to alloc report descr\n");
622 		return -ENOMEM;
623 	}
624 
625 	return 0;
626 }
627 
628 /**
629  * hid_ishtp_cl_init() - Init function for ISHTP client
630  * @hid_ishtp_cl:	ISHTP client instance
631  * @reset:		true if called for init after reset
632  *
633  * This function complete the initializtion of the client. The summary of
634  * processing:
635  * - Send request to enumerate the hid clients
636  *	Get the HID descriptor for each enumearated device
637  *	Get report description of each device
638  *	Register each device wik hid core by calling ishtp_hid_probe
639  *
640  * Return: 0 on success, non zero on error
641  */
642 static int hid_ishtp_cl_init(struct ishtp_cl *hid_ishtp_cl, int reset)
643 {
644 	struct ishtp_device *dev;
645 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
646 	struct ishtp_fw_client *fw_client;
647 	int i;
648 	int rv;
649 
650 	dev_dbg(cl_data_to_dev(client_data), "%s\n", __func__);
651 	hid_ishtp_trace(client_data,  "%s reset flag: %d\n", __func__, reset);
652 
653 	rv = ishtp_cl_link(hid_ishtp_cl);
654 	if (rv) {
655 		dev_err(cl_data_to_dev(client_data),
656 			"ishtp_cl_link failed\n");
657 		return	-ENOMEM;
658 	}
659 
660 	client_data->init_done = 0;
661 
662 	dev = ishtp_get_ishtp_device(hid_ishtp_cl);
663 
664 	/* Connect to FW client */
665 	ishtp_set_tx_ring_size(hid_ishtp_cl, HID_CL_TX_RING_SIZE);
666 	ishtp_set_rx_ring_size(hid_ishtp_cl, HID_CL_RX_RING_SIZE);
667 
668 	fw_client = ishtp_fw_cl_get_client(dev, &hid_ishtp_guid);
669 	if (!fw_client) {
670 		dev_err(cl_data_to_dev(client_data),
671 			"ish client uuid not found\n");
672 		return -ENOENT;
673 	}
674 	ishtp_cl_set_fw_client_id(hid_ishtp_cl,
675 				  ishtp_get_fw_client_id(fw_client));
676 	ishtp_set_connection_state(hid_ishtp_cl, ISHTP_CL_CONNECTING);
677 
678 	rv = ishtp_cl_connect(hid_ishtp_cl);
679 	if (rv) {
680 		dev_err(cl_data_to_dev(client_data),
681 			"client connect fail\n");
682 		goto err_cl_unlink;
683 	}
684 
685 	hid_ishtp_trace(client_data,  "%s client connected\n", __func__);
686 
687 	/* Register read callback */
688 	ishtp_register_event_cb(client_data->cl_device, ish_cl_event_cb);
689 
690 	rv = ishtp_enum_enum_devices(hid_ishtp_cl);
691 	if (rv)
692 		goto err_cl_disconnect;
693 
694 	hid_ishtp_trace(client_data,  "%s enumerated device count %d\n",
695 			__func__, client_data->num_hid_devices);
696 
697 	for (i = 0; i < client_data->num_hid_devices; ++i) {
698 		client_data->cur_hid_dev = i;
699 
700 		rv = ishtp_get_hid_descriptor(hid_ishtp_cl, i);
701 		if (rv)
702 			goto err_cl_disconnect;
703 
704 		rv = ishtp_get_report_descriptor(hid_ishtp_cl, i);
705 		if (rv)
706 			goto err_cl_disconnect;
707 
708 		if (!reset) {
709 			rv = ishtp_hid_probe(i, client_data);
710 			if (rv) {
711 				dev_err(cl_data_to_dev(client_data),
712 				"[hid-ish]: HID probe for #%u failed: %d\n",
713 				i, rv);
714 				goto err_cl_disconnect;
715 			}
716 		}
717 	} /* for() on all hid devices */
718 
719 	client_data->init_done = 1;
720 	client_data->suspended = false;
721 	wake_up_interruptible(&client_data->ishtp_resume_wait);
722 	hid_ishtp_trace(client_data,  "%s successful init\n", __func__);
723 	return 0;
724 
725 err_cl_disconnect:
726 	ishtp_set_connection_state(hid_ishtp_cl, ISHTP_CL_DISCONNECTING);
727 	ishtp_cl_disconnect(hid_ishtp_cl);
728 err_cl_unlink:
729 	ishtp_cl_unlink(hid_ishtp_cl);
730 	return rv;
731 }
732 
733 /**
734  * hid_ishtp_cl_deinit() - Deinit function for ISHTP client
735  * @hid_ishtp_cl:	ISHTP client instance
736  *
737  * Unlink and free hid client
738  */
739 static void hid_ishtp_cl_deinit(struct ishtp_cl *hid_ishtp_cl)
740 {
741 	ishtp_cl_unlink(hid_ishtp_cl);
742 	ishtp_cl_flush_queues(hid_ishtp_cl);
743 
744 	/* disband and free all Tx and Rx client-level rings */
745 	ishtp_cl_free(hid_ishtp_cl);
746 }
747 
748 static void hid_ishtp_cl_reset_handler(struct work_struct *work)
749 {
750 	struct ishtp_cl_data *client_data;
751 	struct ishtp_cl *hid_ishtp_cl;
752 	struct ishtp_cl_device *cl_device;
753 	int retry;
754 	int rv;
755 
756 	client_data = container_of(work, struct ishtp_cl_data, work);
757 
758 	hid_ishtp_cl = client_data->hid_ishtp_cl;
759 	cl_device = client_data->cl_device;
760 
761 	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
762 			hid_ishtp_cl);
763 	dev_dbg(ishtp_device(client_data->cl_device), "%s\n", __func__);
764 
765 	hid_ishtp_cl_deinit(hid_ishtp_cl);
766 
767 	hid_ishtp_cl = ishtp_cl_allocate(cl_device);
768 	if (!hid_ishtp_cl)
769 		return;
770 
771 	ishtp_set_drvdata(cl_device, hid_ishtp_cl);
772 	ishtp_set_client_data(hid_ishtp_cl, client_data);
773 	client_data->hid_ishtp_cl = hid_ishtp_cl;
774 
775 	client_data->num_hid_devices = 0;
776 
777 	for (retry = 0; retry < 3; ++retry) {
778 		rv = hid_ishtp_cl_init(hid_ishtp_cl, 1);
779 		if (!rv)
780 			break;
781 		dev_err(cl_data_to_dev(client_data), "Retry reset init\n");
782 	}
783 	if (rv) {
784 		dev_err(cl_data_to_dev(client_data), "Reset Failed\n");
785 		hid_ishtp_trace(client_data, "%s Failed hid_ishtp_cl %p\n",
786 				__func__, hid_ishtp_cl);
787 	}
788 }
789 
790 void (*hid_print_trace)(void *unused, const char *format, ...);
791 
792 /**
793  * hid_ishtp_cl_probe() - ISHTP client driver probe
794  * @cl_device:		ISHTP client device instance
795  *
796  * This function gets called on device create on ISHTP bus
797  *
798  * Return: 0 on success, non zero on error
799  */
800 static int hid_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
801 {
802 	struct ishtp_cl *hid_ishtp_cl;
803 	struct ishtp_cl_data *client_data;
804 	int rv;
805 
806 	if (!cl_device)
807 		return	-ENODEV;
808 
809 	client_data = devm_kzalloc(ishtp_device(cl_device),
810 				   sizeof(*client_data),
811 				   GFP_KERNEL);
812 	if (!client_data)
813 		return -ENOMEM;
814 
815 	hid_ishtp_cl = ishtp_cl_allocate(cl_device);
816 	if (!hid_ishtp_cl)
817 		return -ENOMEM;
818 
819 	ishtp_set_drvdata(cl_device, hid_ishtp_cl);
820 	ishtp_set_client_data(hid_ishtp_cl, client_data);
821 	client_data->hid_ishtp_cl = hid_ishtp_cl;
822 	client_data->cl_device = cl_device;
823 
824 	init_waitqueue_head(&client_data->init_wait);
825 	init_waitqueue_head(&client_data->ishtp_resume_wait);
826 
827 	INIT_WORK(&client_data->work, hid_ishtp_cl_reset_handler);
828 
829 	hid_print_trace = ishtp_trace_callback(cl_device);
830 
831 	rv = hid_ishtp_cl_init(hid_ishtp_cl, 0);
832 	if (rv) {
833 		ishtp_cl_free(hid_ishtp_cl);
834 		return rv;
835 	}
836 	ishtp_get_device(cl_device);
837 
838 	return 0;
839 }
840 
841 /**
842  * hid_ishtp_cl_remove() - ISHTP client driver remove
843  * @cl_device:		ISHTP client device instance
844  *
845  * This function gets called on device remove on ISHTP bus
846  *
847  * Return: 0
848  */
849 static int hid_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
850 {
851 	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
852 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
853 
854 	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
855 			hid_ishtp_cl);
856 
857 	dev_dbg(ishtp_device(cl_device), "%s\n", __func__);
858 	ishtp_set_connection_state(hid_ishtp_cl, ISHTP_CL_DISCONNECTING);
859 	ishtp_cl_disconnect(hid_ishtp_cl);
860 	ishtp_put_device(cl_device);
861 	ishtp_hid_remove(client_data);
862 	hid_ishtp_cl_deinit(hid_ishtp_cl);
863 
864 	hid_ishtp_cl = NULL;
865 
866 	client_data->num_hid_devices = 0;
867 
868 	return 0;
869 }
870 
871 /**
872  * hid_ishtp_cl_reset() - ISHTP client driver reset
873  * @cl_device:		ISHTP client device instance
874  *
875  * This function gets called on device reset on ISHTP bus
876  *
877  * Return: 0
878  */
879 static int hid_ishtp_cl_reset(struct ishtp_cl_device *cl_device)
880 {
881 	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
882 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
883 
884 	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
885 			hid_ishtp_cl);
886 
887 	schedule_work(&client_data->work);
888 
889 	return 0;
890 }
891 
892 /**
893  * hid_ishtp_cl_suspend() - ISHTP client driver suspend
894  * @device:	device instance
895  *
896  * This function gets called on system suspend
897  *
898  * Return: 0
899  */
900 static int hid_ishtp_cl_suspend(struct device *device)
901 {
902 	struct ishtp_cl_device *cl_device = dev_get_drvdata(device);
903 	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
904 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
905 
906 	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
907 			hid_ishtp_cl);
908 	client_data->suspended = true;
909 
910 	return 0;
911 }
912 
913 /**
914  * hid_ishtp_cl_resume() - ISHTP client driver resume
915  * @device:	device instance
916  *
917  * This function gets called on system resume
918  *
919  * Return: 0
920  */
921 static int hid_ishtp_cl_resume(struct device *device)
922 {
923 	struct ishtp_cl_device *cl_device = dev_get_drvdata(device);
924 	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
925 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
926 
927 	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
928 			hid_ishtp_cl);
929 	client_data->suspended = false;
930 	return 0;
931 }
932 
933 static const struct dev_pm_ops hid_ishtp_pm_ops = {
934 	.suspend = hid_ishtp_cl_suspend,
935 	.resume = hid_ishtp_cl_resume,
936 };
937 
938 static struct ishtp_cl_driver	hid_ishtp_cl_driver = {
939 	.name = "ish-hid",
940 	.guid = &hid_ishtp_guid,
941 	.probe = hid_ishtp_cl_probe,
942 	.remove = hid_ishtp_cl_remove,
943 	.reset = hid_ishtp_cl_reset,
944 	.driver.pm = &hid_ishtp_pm_ops,
945 };
946 
947 static int __init ish_hid_init(void)
948 {
949 	int	rv;
950 
951 	/* Register ISHTP client device driver with ISHTP Bus */
952 	rv = ishtp_cl_driver_register(&hid_ishtp_cl_driver, THIS_MODULE);
953 
954 	return rv;
955 
956 }
957 
958 static void __exit ish_hid_exit(void)
959 {
960 	ishtp_cl_driver_unregister(&hid_ishtp_cl_driver);
961 }
962 
963 late_initcall(ish_hid_init);
964 module_exit(ish_hid_exit);
965 
966 MODULE_DESCRIPTION("ISH ISHTP HID client driver");
967 /* Primary author */
968 MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
969 /*
970  * Several modification for multi instance support
971  * suspend/resume and clean up
972  */
973 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
974 
975 MODULE_LICENSE("GPL");
976 MODULE_ALIAS("ishtp:*");
977