1 // SPDX-License-Identifier: GPL-2.0
3 * Sample in-kernel QMI client driver
5 * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
6 * Copyright (C) 2017 Linaro Ltd.
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/debugfs.h>
11 #include <linux/device.h>
12 #include <linux/platform_device.h>
13 #include <linux/qrtr.h>
14 #include <linux/net.h>
15 #include <linux/completion.h>
16 #include <linux/idr.h>
17 #include <linux/string.h>
19 #include <linux/soc/qcom/qmi.h>
21 #define PING_REQ1_TLV_TYPE 0x1
22 #define PING_RESP1_TLV_TYPE 0x2
23 #define PING_OPT1_TLV_TYPE 0x10
24 #define PING_OPT2_TLV_TYPE 0x11
26 #define DATA_REQ1_TLV_TYPE 0x1
27 #define DATA_RESP1_TLV_TYPE 0x2
28 #define DATA_OPT1_TLV_TYPE 0x10
29 #define DATA_OPT2_TLV_TYPE 0x11
31 #define TEST_MED_DATA_SIZE_V01 8192
32 #define TEST_MAX_NAME_SIZE_V01 255
34 #define TEST_PING_REQ_MSG_ID_V01 0x20
35 #define TEST_DATA_REQ_MSG_ID_V01 0x21
37 #define TEST_PING_REQ_MAX_MSG_LEN_V01 266
38 #define TEST_DATA_REQ_MAX_MSG_LEN_V01 8456
40 struct test_name_type_v01 {
42 char name[TEST_MAX_NAME_SIZE_V01];
45 static struct qmi_elem_info test_name_type_v01_ei[] = {
47 .data_type = QMI_DATA_LEN,
49 .elem_size = sizeof(u8),
50 .array_type = NO_ARRAY,
51 .tlv_type = QMI_COMMON_TLV_TYPE,
52 .offset = offsetof(struct test_name_type_v01,
56 .data_type = QMI_UNSIGNED_1_BYTE,
57 .elem_len = TEST_MAX_NAME_SIZE_V01,
58 .elem_size = sizeof(char),
59 .array_type = VAR_LEN_ARRAY,
60 .tlv_type = QMI_COMMON_TLV_TYPE,
61 .offset = offsetof(struct test_name_type_v01,
67 struct test_ping_req_msg_v01 {
71 struct test_name_type_v01 client_name;
74 static struct qmi_elem_info test_ping_req_msg_v01_ei[] = {
76 .data_type = QMI_UNSIGNED_1_BYTE,
78 .elem_size = sizeof(char),
79 .array_type = STATIC_ARRAY,
80 .tlv_type = PING_REQ1_TLV_TYPE,
81 .offset = offsetof(struct test_ping_req_msg_v01,
85 .data_type = QMI_OPT_FLAG,
87 .elem_size = sizeof(u8),
88 .array_type = NO_ARRAY,
89 .tlv_type = PING_OPT1_TLV_TYPE,
90 .offset = offsetof(struct test_ping_req_msg_v01,
94 .data_type = QMI_STRUCT,
96 .elem_size = sizeof(struct test_name_type_v01),
97 .array_type = NO_ARRAY,
98 .tlv_type = PING_OPT1_TLV_TYPE,
99 .offset = offsetof(struct test_ping_req_msg_v01,
101 .ei_array = test_name_type_v01_ei,
106 struct test_ping_resp_msg_v01 {
107 struct qmi_response_type_v01 resp;
112 u8 service_name_valid;
113 struct test_name_type_v01 service_name;
116 static struct qmi_elem_info test_ping_resp_msg_v01_ei[] = {
118 .data_type = QMI_STRUCT,
120 .elem_size = sizeof(struct qmi_response_type_v01),
121 .array_type = NO_ARRAY,
122 .tlv_type = PING_RESP1_TLV_TYPE,
123 .offset = offsetof(struct test_ping_resp_msg_v01,
125 .ei_array = qmi_response_type_v01_ei,
128 .data_type = QMI_OPT_FLAG,
130 .elem_size = sizeof(u8),
131 .array_type = NO_ARRAY,
132 .tlv_type = PING_OPT1_TLV_TYPE,
133 .offset = offsetof(struct test_ping_resp_msg_v01,
137 .data_type = QMI_UNSIGNED_1_BYTE,
139 .elem_size = sizeof(char),
140 .array_type = STATIC_ARRAY,
141 .tlv_type = PING_OPT1_TLV_TYPE,
142 .offset = offsetof(struct test_ping_resp_msg_v01,
146 .data_type = QMI_OPT_FLAG,
148 .elem_size = sizeof(u8),
149 .array_type = NO_ARRAY,
150 .tlv_type = PING_OPT2_TLV_TYPE,
151 .offset = offsetof(struct test_ping_resp_msg_v01,
155 .data_type = QMI_STRUCT,
157 .elem_size = sizeof(struct test_name_type_v01),
158 .array_type = NO_ARRAY,
159 .tlv_type = PING_OPT2_TLV_TYPE,
160 .offset = offsetof(struct test_ping_resp_msg_v01,
162 .ei_array = test_name_type_v01_ei,
167 struct test_data_req_msg_v01 {
169 u8 data[TEST_MED_DATA_SIZE_V01];
171 u8 client_name_valid;
172 struct test_name_type_v01 client_name;
175 static struct qmi_elem_info test_data_req_msg_v01_ei[] = {
177 .data_type = QMI_DATA_LEN,
179 .elem_size = sizeof(u32),
180 .array_type = NO_ARRAY,
181 .tlv_type = DATA_REQ1_TLV_TYPE,
182 .offset = offsetof(struct test_data_req_msg_v01,
186 .data_type = QMI_UNSIGNED_1_BYTE,
187 .elem_len = TEST_MED_DATA_SIZE_V01,
188 .elem_size = sizeof(u8),
189 .array_type = VAR_LEN_ARRAY,
190 .tlv_type = DATA_REQ1_TLV_TYPE,
191 .offset = offsetof(struct test_data_req_msg_v01,
195 .data_type = QMI_OPT_FLAG,
197 .elem_size = sizeof(u8),
198 .array_type = NO_ARRAY,
199 .tlv_type = DATA_OPT1_TLV_TYPE,
200 .offset = offsetof(struct test_data_req_msg_v01,
204 .data_type = QMI_STRUCT,
206 .elem_size = sizeof(struct test_name_type_v01),
207 .array_type = NO_ARRAY,
208 .tlv_type = DATA_OPT1_TLV_TYPE,
209 .offset = offsetof(struct test_data_req_msg_v01,
211 .ei_array = test_name_type_v01_ei,
216 struct test_data_resp_msg_v01 {
217 struct qmi_response_type_v01 resp;
221 u8 data[TEST_MED_DATA_SIZE_V01];
223 u8 service_name_valid;
224 struct test_name_type_v01 service_name;
227 static struct qmi_elem_info test_data_resp_msg_v01_ei[] = {
229 .data_type = QMI_STRUCT,
231 .elem_size = sizeof(struct qmi_response_type_v01),
232 .array_type = NO_ARRAY,
233 .tlv_type = DATA_RESP1_TLV_TYPE,
234 .offset = offsetof(struct test_data_resp_msg_v01,
236 .ei_array = qmi_response_type_v01_ei,
239 .data_type = QMI_OPT_FLAG,
241 .elem_size = sizeof(u8),
242 .array_type = NO_ARRAY,
243 .tlv_type = DATA_OPT1_TLV_TYPE,
244 .offset = offsetof(struct test_data_resp_msg_v01,
248 .data_type = QMI_DATA_LEN,
250 .elem_size = sizeof(u32),
251 .array_type = NO_ARRAY,
252 .tlv_type = DATA_OPT1_TLV_TYPE,
253 .offset = offsetof(struct test_data_resp_msg_v01,
257 .data_type = QMI_UNSIGNED_1_BYTE,
258 .elem_len = TEST_MED_DATA_SIZE_V01,
259 .elem_size = sizeof(u8),
260 .array_type = VAR_LEN_ARRAY,
261 .tlv_type = DATA_OPT1_TLV_TYPE,
262 .offset = offsetof(struct test_data_resp_msg_v01,
266 .data_type = QMI_OPT_FLAG,
268 .elem_size = sizeof(u8),
269 .array_type = NO_ARRAY,
270 .tlv_type = DATA_OPT2_TLV_TYPE,
271 .offset = offsetof(struct test_data_resp_msg_v01,
275 .data_type = QMI_STRUCT,
277 .elem_size = sizeof(struct test_name_type_v01),
278 .array_type = NO_ARRAY,
279 .tlv_type = DATA_OPT2_TLV_TYPE,
280 .offset = offsetof(struct test_data_resp_msg_v01,
282 .ei_array = test_name_type_v01_ei,
288 * ping_write() - ping_pong debugfs file write handler
289 * @file: debugfs file context
290 * @user_buf: reference to the user data (ignored)
291 * @count: number of bytes in @user_buf
292 * @ppos: offset in @file to write
294 * This function allows user space to send out a ping_pong QMI encoded message
295 * to the associated remote test service and will return with the result of the
296 * transaction. It serves as an example of how to provide a custom response
299 * Return: @count, or negative errno on failure.
301 static ssize_t ping_write(struct file *file, const char __user *user_buf,
302 size_t count, loff_t *ppos)
304 struct qmi_handle *qmi = file->private_data;
305 struct test_ping_req_msg_v01 req = {};
309 memcpy(req.ping, "ping", sizeof(req.ping));
311 ret = qmi_txn_init(qmi, &txn, NULL, NULL);
315 ret = qmi_send_request(qmi, NULL, &txn,
316 TEST_PING_REQ_MSG_ID_V01,
317 TEST_PING_REQ_MAX_MSG_LEN_V01,
318 test_ping_req_msg_v01_ei, &req);
320 qmi_txn_cancel(&txn);
324 ret = qmi_txn_wait(&txn, 5 * HZ);
331 static const struct file_operations ping_fops = {
336 static void ping_pong_cb(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
337 struct qmi_txn *txn, const void *data)
339 const struct test_ping_resp_msg_v01 *resp = data;
342 pr_err("spurious ping response\n");
346 if (resp->resp.result == QMI_RESULT_FAILURE_V01)
347 txn->result = -ENXIO;
348 else if (!resp->pong_valid || memcmp(resp->pong, "pong", 4))
349 txn->result = -EINVAL;
351 complete(&txn->completion);
355 * data_write() - data debugfs file write handler
356 * @file: debugfs file context
357 * @user_buf: reference to the user data
358 * @count: number of bytes in @user_buf
359 * @ppos: offset in @file to write
361 * This function allows user space to send out a data QMI encoded message to
362 * the associated remote test service and will return with the result of the
363 * transaction. It serves as an example of how to have the QMI helpers decode a
364 * transaction response into a provided object automatically.
366 * Return: @count, or negative errno on failure.
368 static ssize_t data_write(struct file *file, const char __user *user_buf,
369 size_t count, loff_t *ppos)
372 struct qmi_handle *qmi = file->private_data;
373 struct test_data_resp_msg_v01 *resp;
374 struct test_data_req_msg_v01 *req;
378 req = kzalloc(sizeof(*req), GFP_KERNEL);
382 resp = kzalloc(sizeof(*resp), GFP_KERNEL);
388 req->data_len = min_t(size_t, sizeof(req->data), count);
389 if (copy_from_user(req->data, user_buf, req->data_len)) {
394 ret = qmi_txn_init(qmi, &txn, test_data_resp_msg_v01_ei, resp);
398 ret = qmi_send_request(qmi, NULL, &txn,
399 TEST_DATA_REQ_MSG_ID_V01,
400 TEST_DATA_REQ_MAX_MSG_LEN_V01,
401 test_data_req_msg_v01_ei, req);
403 qmi_txn_cancel(&txn);
407 ret = qmi_txn_wait(&txn, 5 * HZ);
410 } else if (!resp->data_valid ||
411 resp->data_len != req->data_len ||
412 memcmp(resp->data, req->data, req->data_len)) {
413 pr_err("response data doesn't match expectation\n");
427 static const struct file_operations data_fops = {
432 static const struct qmi_msg_handler qmi_sample_handlers[] = {
434 .type = QMI_RESPONSE,
435 .msg_id = TEST_PING_REQ_MSG_ID_V01,
436 .ei = test_ping_resp_msg_v01_ei,
437 .decoded_size = sizeof(struct test_ping_req_msg_v01),
444 struct qmi_handle qmi;
446 struct dentry *de_dir;
447 struct dentry *de_data;
448 struct dentry *de_ping;
451 static struct dentry *qmi_debug_dir;
453 static int qmi_sample_probe(struct platform_device *pdev)
455 struct sockaddr_qrtr *sq;
456 struct qmi_sample *sample;
460 sample = devm_kzalloc(&pdev->dev, sizeof(*sample), GFP_KERNEL);
464 ret = qmi_handle_init(&sample->qmi, TEST_DATA_REQ_MAX_MSG_LEN_V01,
466 qmi_sample_handlers);
470 sq = dev_get_platdata(&pdev->dev);
471 ret = kernel_connect(sample->qmi.sock, (struct sockaddr *)sq,
474 pr_err("failed to connect to remote service port\n");
475 goto err_release_qmi_handle;
478 snprintf(path, sizeof(path), "%d:%d", sq->sq_node, sq->sq_port);
480 sample->de_dir = debugfs_create_dir(path, qmi_debug_dir);
481 if (IS_ERR(sample->de_dir)) {
482 ret = PTR_ERR(sample->de_dir);
483 goto err_release_qmi_handle;
486 sample->de_data = debugfs_create_file("data", 0600, sample->de_dir,
488 if (IS_ERR(sample->de_data)) {
489 ret = PTR_ERR(sample->de_data);
490 goto err_remove_de_dir;
493 sample->de_ping = debugfs_create_file("ping", 0600, sample->de_dir,
495 if (IS_ERR(sample->de_ping)) {
496 ret = PTR_ERR(sample->de_ping);
497 goto err_remove_de_data;
500 platform_set_drvdata(pdev, sample);
505 debugfs_remove(sample->de_data);
507 debugfs_remove(sample->de_dir);
508 err_release_qmi_handle:
509 qmi_handle_release(&sample->qmi);
514 static int qmi_sample_remove(struct platform_device *pdev)
516 struct qmi_sample *sample = platform_get_drvdata(pdev);
518 debugfs_remove(sample->de_ping);
519 debugfs_remove(sample->de_data);
520 debugfs_remove(sample->de_dir);
522 qmi_handle_release(&sample->qmi);
527 static struct platform_driver qmi_sample_driver = {
528 .probe = qmi_sample_probe,
529 .remove = qmi_sample_remove,
531 .name = "qmi_sample_client",
535 static int qmi_sample_new_server(struct qmi_handle *qmi,
536 struct qmi_service *service)
538 struct platform_device *pdev;
539 struct sockaddr_qrtr sq = { AF_QIPCRTR, service->node, service->port };
542 pdev = platform_device_alloc("qmi_sample_client", PLATFORM_DEVID_AUTO);
546 ret = platform_device_add_data(pdev, &sq, sizeof(sq));
550 ret = platform_device_add(pdev);
554 service->priv = pdev;
559 platform_device_put(pdev);
564 static void qmi_sample_del_server(struct qmi_handle *qmi,
565 struct qmi_service *service)
567 struct platform_device *pdev = service->priv;
569 platform_device_unregister(pdev);
572 static struct qmi_handle lookup_client;
574 static const struct qmi_ops lookup_ops = {
575 .new_server = qmi_sample_new_server,
576 .del_server = qmi_sample_del_server,
579 static int qmi_sample_init(void)
583 qmi_debug_dir = debugfs_create_dir("qmi_sample", NULL);
584 if (IS_ERR(qmi_debug_dir)) {
585 pr_err("failed to create qmi_sample dir\n");
586 return PTR_ERR(qmi_debug_dir);
589 ret = platform_driver_register(&qmi_sample_driver);
591 goto err_remove_debug_dir;
593 ret = qmi_handle_init(&lookup_client, 0, &lookup_ops, NULL);
595 goto err_unregister_driver;
597 qmi_add_lookup(&lookup_client, 15, 0, 0);
601 err_unregister_driver:
602 platform_driver_unregister(&qmi_sample_driver);
603 err_remove_debug_dir:
604 debugfs_remove(qmi_debug_dir);
609 static void qmi_sample_exit(void)
611 qmi_handle_release(&lookup_client);
613 platform_driver_unregister(&qmi_sample_driver);
615 debugfs_remove(qmi_debug_dir);
618 module_init(qmi_sample_init);
619 module_exit(qmi_sample_exit);
621 MODULE_DESCRIPTION("Sample QMI client driver");
622 MODULE_LICENSE("GPL v2");