1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ISHTP client driver for HID (ISH)
4 *
5 * Copyright (c) 2014-2016, Intel Corporation.
6 */
7
8 #include <linux/module.h>
9 #include <linux/hid.h>
10 #include <linux/intel-ish-client-if.h>
11 #include <linux/sched.h>
12 #include "ishtp-hid.h"
13
14 /* ISH Transport protocol (ISHTP in short) GUID */
15 static const struct ishtp_device_id hid_ishtp_id_table[] = {
16 { .guid = GUID_INIT(0x33AECD58, 0xB679, 0x4E54,
17 0x9B, 0xD9, 0xA0, 0x4D, 0x34, 0xF0, 0xC2, 0x26), },
18 { }
19 };
20 MODULE_DEVICE_TABLE(ishtp, hid_ishtp_id_table);
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_packet() - 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 */
report_bad_packet(struct ishtp_cl * hid_ishtp_cl,void * recv_buf,size_t cur_pos,size_t payload_len)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 */
process_recv(struct ishtp_cl * hid_ishtp_cl,void * recv_buf,size_t data_len)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 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 */
ish_cl_event_cb(struct ishtp_cl_device * device)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 */
hid_ishtp_set_feature(struct hid_device * hid,char * buf,unsigned int len,int report_id)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 */
hid_ishtp_get_report(struct hid_device * hid,int report_id,int report_type)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 */
ishtp_hid_link_ready_wait(struct ishtp_cl_data * client_data)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 */
ishtp_enum_enum_devices(struct ishtp_cl * hid_ishtp_cl)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 */
ishtp_get_hid_descriptor(struct ishtp_cl * hid_ishtp_cl,int index)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 */
ishtp_get_report_descriptor(struct ishtp_cl * hid_ishtp_cl,int index)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 */
hid_ishtp_cl_init(struct ishtp_cl * hid_ishtp_cl,bool reset)642 static int hid_ishtp_cl_init(struct ishtp_cl *hid_ishtp_cl, bool reset)
643 {
644 struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
645 int i;
646 int rv;
647
648 dev_dbg(cl_data_to_dev(client_data), "%s\n", __func__);
649 hid_ishtp_trace(client_data, "%s reset flag: %d\n", __func__, reset);
650
651 client_data->init_done = 0;
652
653 rv = ishtp_cl_establish_connection(hid_ishtp_cl,
654 &hid_ishtp_id_table[0].guid,
655 HID_CL_TX_RING_SIZE,
656 HID_CL_RX_RING_SIZE,
657 reset);
658 if (rv) {
659 dev_err(cl_data_to_dev(client_data),
660 "client connect fail\n");
661 goto err_cl_disconnect;
662 }
663
664 hid_ishtp_trace(client_data, "%s client connected\n", __func__);
665
666 /* Register read callback */
667 ishtp_register_event_cb(client_data->cl_device, ish_cl_event_cb);
668
669 rv = ishtp_enum_enum_devices(hid_ishtp_cl);
670 if (rv)
671 goto err_cl_disconnect;
672
673 hid_ishtp_trace(client_data, "%s enumerated device count %d\n",
674 __func__, client_data->num_hid_devices);
675
676 for (i = 0; i < client_data->num_hid_devices; ++i) {
677 client_data->cur_hid_dev = i;
678
679 rv = ishtp_get_hid_descriptor(hid_ishtp_cl, i);
680 if (rv)
681 goto err_cl_disconnect;
682
683 rv = ishtp_get_report_descriptor(hid_ishtp_cl, i);
684 if (rv)
685 goto err_cl_disconnect;
686
687 if (!reset) {
688 rv = ishtp_hid_probe(i, client_data);
689 if (rv) {
690 dev_err(cl_data_to_dev(client_data),
691 "[hid-ish]: HID probe for #%u failed: %d\n",
692 i, rv);
693 goto err_cl_disconnect;
694 }
695 }
696 } /* for() on all hid devices */
697
698 client_data->init_done = 1;
699 client_data->suspended = false;
700 wake_up_interruptible(&client_data->ishtp_resume_wait);
701 hid_ishtp_trace(client_data, "%s successful init\n", __func__);
702 return 0;
703
704 err_cl_disconnect:
705 ishtp_cl_destroy_connection(hid_ishtp_cl, reset);
706 return rv;
707 }
708
709 /**
710 * hid_ishtp_cl_deinit() - Deinit function for ISHTP client
711 * @hid_ishtp_cl: ISHTP client instance
712 *
713 * Unlink and free hid client
714 */
hid_ishtp_cl_deinit(struct ishtp_cl * hid_ishtp_cl)715 static void hid_ishtp_cl_deinit(struct ishtp_cl *hid_ishtp_cl)
716 {
717 ishtp_cl_destroy_connection(hid_ishtp_cl, false);
718
719 /* disband and free all Tx and Rx client-level rings */
720 ishtp_cl_free(hid_ishtp_cl);
721 }
722
hid_ishtp_cl_reset_handler(struct work_struct * work)723 static void hid_ishtp_cl_reset_handler(struct work_struct *work)
724 {
725 struct ishtp_cl_data *client_data;
726 struct ishtp_cl *hid_ishtp_cl;
727 int retry;
728 int rv;
729
730 client_data = container_of(work, struct ishtp_cl_data, work);
731
732 hid_ishtp_cl = client_data->hid_ishtp_cl;
733
734 hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
735 hid_ishtp_cl);
736 dev_dbg(ishtp_device(client_data->cl_device), "%s\n", __func__);
737
738 ishtp_cl_destroy_connection(hid_ishtp_cl, true);
739
740 client_data->num_hid_devices = 0;
741
742 for (retry = 0; retry < 3; ++retry) {
743 rv = hid_ishtp_cl_init(hid_ishtp_cl, true);
744 if (!rv)
745 break;
746 dev_err(cl_data_to_dev(client_data), "Retry reset init\n");
747 }
748 if (rv) {
749 dev_err(cl_data_to_dev(client_data), "Reset Failed\n");
750 hid_ishtp_trace(client_data, "%s Failed hid_ishtp_cl %p\n",
751 __func__, hid_ishtp_cl);
752 }
753 }
754
hid_ishtp_cl_resume_handler(struct work_struct * work)755 static void hid_ishtp_cl_resume_handler(struct work_struct *work)
756 {
757 struct ishtp_cl_data *client_data = container_of(work, struct ishtp_cl_data, resume_work);
758 struct ishtp_cl *hid_ishtp_cl = client_data->hid_ishtp_cl;
759
760 if (ishtp_wait_resume(ishtp_get_ishtp_device(hid_ishtp_cl))) {
761 client_data->suspended = false;
762 wake_up_interruptible(&client_data->ishtp_resume_wait);
763 }
764 }
765
766 ishtp_print_log ishtp_hid_print_trace;
767
768 /**
769 * hid_ishtp_cl_probe() - ISHTP client driver probe
770 * @cl_device: ISHTP client device instance
771 *
772 * This function gets called on device create on ISHTP bus
773 *
774 * Return: 0 on success, non zero on error
775 */
hid_ishtp_cl_probe(struct ishtp_cl_device * cl_device)776 static int hid_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
777 {
778 struct ishtp_cl *hid_ishtp_cl;
779 struct ishtp_cl_data *client_data;
780 int rv;
781
782 if (!cl_device)
783 return -ENODEV;
784
785 client_data = devm_kzalloc(ishtp_device(cl_device),
786 sizeof(*client_data),
787 GFP_KERNEL);
788 if (!client_data)
789 return -ENOMEM;
790
791 hid_ishtp_cl = ishtp_cl_allocate(cl_device);
792 if (!hid_ishtp_cl)
793 return -ENOMEM;
794
795 ishtp_set_drvdata(cl_device, hid_ishtp_cl);
796 ishtp_set_client_data(hid_ishtp_cl, client_data);
797 client_data->hid_ishtp_cl = hid_ishtp_cl;
798 client_data->cl_device = cl_device;
799
800 init_waitqueue_head(&client_data->init_wait);
801 init_waitqueue_head(&client_data->ishtp_resume_wait);
802
803 INIT_WORK(&client_data->work, hid_ishtp_cl_reset_handler);
804 INIT_WORK(&client_data->resume_work, hid_ishtp_cl_resume_handler);
805
806
807 ishtp_hid_print_trace = ishtp_trace_callback(cl_device);
808
809 rv = hid_ishtp_cl_init(hid_ishtp_cl, false);
810 if (rv) {
811 ishtp_cl_free(hid_ishtp_cl);
812 return rv;
813 }
814 ishtp_get_device(cl_device);
815
816 return 0;
817 }
818
819 /**
820 * hid_ishtp_cl_remove() - ISHTP client driver remove
821 * @cl_device: ISHTP client device instance
822 *
823 * This function gets called on device remove on ISHTP bus
824 *
825 * Return: 0
826 */
hid_ishtp_cl_remove(struct ishtp_cl_device * cl_device)827 static void hid_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
828 {
829 struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
830 struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
831
832 hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
833 hid_ishtp_cl);
834
835 dev_dbg(ishtp_device(cl_device), "%s\n", __func__);
836 hid_ishtp_cl_deinit(hid_ishtp_cl);
837 ishtp_put_device(cl_device);
838 ishtp_hid_remove(client_data);
839
840 hid_ishtp_cl = NULL;
841
842 client_data->num_hid_devices = 0;
843 }
844
845 /**
846 * hid_ishtp_cl_reset() - ISHTP client driver reset
847 * @cl_device: ISHTP client device instance
848 *
849 * This function gets called on device reset on ISHTP bus
850 *
851 * Return: 0
852 */
hid_ishtp_cl_reset(struct ishtp_cl_device * cl_device)853 static int hid_ishtp_cl_reset(struct ishtp_cl_device *cl_device)
854 {
855 struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
856 struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
857
858 hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
859 hid_ishtp_cl);
860
861 schedule_work(&client_data->work);
862
863 return 0;
864 }
865
866 /**
867 * hid_ishtp_cl_suspend() - ISHTP client driver suspend
868 * @device: device instance
869 *
870 * This function gets called on system suspend
871 *
872 * Return: 0
873 */
hid_ishtp_cl_suspend(struct device * device)874 static int hid_ishtp_cl_suspend(struct device *device)
875 {
876 struct ishtp_cl_device *cl_device = ishtp_dev_to_cl_device(device);
877 struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
878 struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
879
880 hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
881 hid_ishtp_cl);
882 client_data->suspended = true;
883
884 return 0;
885 }
886
887 /**
888 * hid_ishtp_cl_resume() - ISHTP client driver resume
889 * @device: device instance
890 *
891 * This function gets called on system resume
892 *
893 * Return: 0
894 */
hid_ishtp_cl_resume(struct device * device)895 static int hid_ishtp_cl_resume(struct device *device)
896 {
897 struct ishtp_cl_device *cl_device = ishtp_dev_to_cl_device(device);
898 struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
899 struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
900
901 hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
902 hid_ishtp_cl);
903 schedule_work(&client_data->resume_work);
904 return 0;
905 }
906
907 static const struct dev_pm_ops hid_ishtp_pm_ops = {
908 .suspend = hid_ishtp_cl_suspend,
909 .resume = hid_ishtp_cl_resume,
910 };
911
912 static struct ishtp_cl_driver hid_ishtp_cl_driver = {
913 .name = "ish-hid",
914 .id = hid_ishtp_id_table,
915 .probe = hid_ishtp_cl_probe,
916 .remove = hid_ishtp_cl_remove,
917 .reset = hid_ishtp_cl_reset,
918 .driver.pm = &hid_ishtp_pm_ops,
919 };
920
ish_hid_init(void)921 static int __init ish_hid_init(void)
922 {
923 int rv;
924
925 /* Register ISHTP client device driver with ISHTP Bus */
926 rv = ishtp_cl_driver_register(&hid_ishtp_cl_driver, THIS_MODULE);
927
928 return rv;
929
930 }
931
ish_hid_exit(void)932 static void __exit ish_hid_exit(void)
933 {
934 ishtp_cl_driver_unregister(&hid_ishtp_cl_driver);
935 }
936
937 late_initcall(ish_hid_init);
938 module_exit(ish_hid_exit);
939
940 MODULE_DESCRIPTION("ISH ISHTP HID client driver");
941 /* Primary author */
942 MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
943 /*
944 * Several modification for multi instance support
945 * suspend/resume and clean up
946 */
947 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
948
949 MODULE_LICENSE("GPL");
950