diff options
| -rw-r--r-- | samples/Kconfig | 9 | ||||
| -rw-r--r-- | samples/Makefile | 2 | ||||
| -rw-r--r-- | samples/qmi/Makefile | 1 | ||||
| -rw-r--r-- | samples/qmi/qmi_sample_client.c | 622 |
4 files changed, 633 insertions, 1 deletions
diff --git a/samples/Kconfig b/samples/Kconfig index c332a3b9de05..4cb8af2f810f 100644 --- a/samples/Kconfig +++ b/samples/Kconfig @@ -62,6 +62,15 @@ config SAMPLE_KDB Build an example of how to dynamically add the hello command to the kdb shell. +config SAMPLE_QMI_CLIENT + tristate "Build qmi client sample -- loadable modules only" + depends on m + depends on ARCH_QCOM + select QCOM_QMI_HELPERS + help + Build an QMI client sample driver, which demonstrates how to + communicate with a remote QRTR service, using QMI encoded messages. + config SAMPLE_RPMSG_CLIENT tristate "Build rpmsg client sample -- loadable modules only" depends on RPMSG && m diff --git a/samples/Makefile b/samples/Makefile index db54e766ddb1..a30833a2a19e 100644 --- a/samples/Makefile +++ b/samples/Makefile @@ -3,4 +3,4 @@ obj-$(CONFIG_SAMPLES) += kobject/ kprobes/ trace_events/ livepatch/ \ hw_breakpoint/ kfifo/ kdb/ hidraw/ rpmsg/ seccomp/ \ configfs/ connector/ v4l/ trace_printk/ blackfin/ \ - vfio-mdev/ statx/ + vfio-mdev/ statx/ qmi/ diff --git a/samples/qmi/Makefile b/samples/qmi/Makefile new file mode 100644 index 000000000000..2b111d2769df --- /dev/null +++ b/samples/qmi/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_SAMPLE_QMI_CLIENT) += qmi_sample_client.o diff --git a/samples/qmi/qmi_sample_client.c b/samples/qmi/qmi_sample_client.c new file mode 100644 index 000000000000..c9e7276c3d83 --- /dev/null +++ b/samples/qmi/qmi_sample_client.c @@ -0,0 +1,622 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Sample in-kernel QMI client driver + * + * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. + * Copyright (C) 2017 Linaro Ltd. + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/qrtr.h> +#include <linux/net.h> +#include <linux/completion.h> +#include <linux/idr.h> +#include <linux/string.h> +#include <net/sock.h> +#include <linux/soc/qcom/qmi.h> + +#define PING_REQ1_TLV_TYPE 0x1 +#define PING_RESP1_TLV_TYPE 0x2 +#define PING_OPT1_TLV_TYPE 0x10 +#define PING_OPT2_TLV_TYPE 0x11 + +#define DATA_REQ1_TLV_TYPE 0x1 +#define DATA_RESP1_TLV_TYPE 0x2 +#define DATA_OPT1_TLV_TYPE 0x10 +#define DATA_OPT2_TLV_TYPE 0x11 + +#define TEST_MED_DATA_SIZE_V01 8192 +#define TEST_MAX_NAME_SIZE_V01 255 + +#define TEST_PING_REQ_MSG_ID_V01 0x20 +#define TEST_DATA_REQ_MSG_ID_V01 0x21 + +#define TEST_PING_REQ_MAX_MSG_LEN_V01 266 +#define TEST_DATA_REQ_MAX_MSG_LEN_V01 8456 + +struct test_name_type_v01 { + u32 name_len; + char name[TEST_MAX_NAME_SIZE_V01]; +}; + +static struct qmi_elem_info test_name_type_v01_ei[] = { + { + .data_type = QMI_DATA_LEN, + .elem_len = 1, + .elem_size = sizeof(u8), + .array_type = NO_ARRAY, + .tlv_type = QMI_COMMON_TLV_TYPE, + .offset = offsetof(struct test_name_type_v01, + name_len), + }, + { + .data_type = QMI_UNSIGNED_1_BYTE, + .elem_len = TEST_MAX_NAME_SIZE_V01, + .elem_size = sizeof(char), + .array_type = VAR_LEN_ARRAY, + .tlv_type = QMI_COMMON_TLV_TYPE, + .offset = offsetof(struct test_name_type_v01, + name), + }, + {} +}; + +struct test_ping_req_msg_v01 { + char ping[4]; + + u8 client_name_valid; + struct test_name_type_v01 client_name; +}; + +static struct qmi_elem_info test_ping_req_msg_v01_ei[] = { + { + .data_type = QMI_UNSIGNED_1_BYTE, + .elem_len = 4, + .elem_size = sizeof(char), + .array_type = STATIC_ARRAY, + .tlv_type = PING_REQ1_TLV_TYPE, + .offset = offsetof(struct test_ping_req_msg_v01, + ping), + }, + { + .data_type = QMI_OPT_FLAG, + .elem_len = 1, + .elem_size = sizeof(u8), + .array_type = NO_ARRAY, + .tlv_type = PING_OPT1_TLV_TYPE, + .offset = offsetof(struct test_ping_req_msg_v01, + client_name_valid), + }, + { + .data_type = QMI_STRUCT, + .elem_len = 1, + .elem_size = sizeof(struct test_name_type_v01), + .array_type = NO_ARRAY, + .tlv_type = PING_OPT1_TLV_TYPE, + .offset = offsetof(struct test_ping_req_msg_v01, + client_name), + .ei_array = test_name_type_v01_ei, + }, + {} +}; + +struct test_ping_resp_msg_v01 { + struct qmi_response_type_v01 resp; + + u8 pong_valid; + char pong[4]; + + u8 service_name_valid; + struct test_name_type_v01 service_name; +}; + +static struct qmi_elem_info test_ping_resp_msg_v01_ei[] = { + { + .data_type = QMI_STRUCT, + .elem_len = 1, + .elem_size = sizeof(struct qmi_response_type_v01), + .array_type = NO_ARRAY, + .tlv_type = PING_RESP1_TLV_TYPE, + .offset = offsetof(struct test_ping_resp_msg_v01, + resp), + .ei_array = qmi_response_type_v01_ei, + }, + { + .data_type = QMI_OPT_FLAG, + .elem_len = 1, + .elem_size = sizeof(u8), + .array_type = NO_ARRAY, + .tlv_type = PING_OPT1_TLV_TYPE, + .offset = offsetof(struct test_ping_resp_msg_v01, + pong_valid), + }, + { + .data_type = QMI_UNSIGNED_1_BYTE, + .elem_len = 4, + .elem_size = sizeof(char), + .array_type = STATIC_ARRAY, + .tlv_type = PING_OPT1_TLV_TYPE, + .offset = offsetof(struct test_ping_resp_msg_v01, + pong), + }, + { + .data_type = QMI_OPT_FLAG, + .elem_len = 1, + .elem_size = sizeof(u8), + .array_type = NO_ARRAY, + .tlv_type = PING_OPT2_TLV_TYPE, + .offset = offsetof(struct test_ping_resp_msg_v01, + service_name_valid), + }, + { + .data_type = QMI_STRUCT, + .elem_len = 1, + .elem_size = sizeof(struct test_name_type_v01), + .array_type = NO_ARRAY, + .tlv_type = PING_OPT2_TLV_TYPE, + .offset = offsetof(struct test_ping_resp_msg_v01, + service_name), + .ei_array = test_name_type_v01_ei, + }, + {} +}; + +struct test_data_req_msg_v01 { + u32 data_len; + u8 data[TEST_MED_DATA_SIZE_V01]; + + u8 client_name_valid; + struct test_name_type_v01 client_name; +}; + +static struct qmi_elem_info test_data_req_msg_v01_ei[] = { + { + .data_type = QMI_DATA_LEN, + .elem_len = 1, + .elem_size = sizeof(u32), + .array_type = NO_ARRAY, + .tlv_type = DATA_REQ1_TLV_TYPE, + .offset = offsetof(struct test_data_req_msg_v01, + data_len), + }, + { + .data_type = QMI_UNSIGNED_1_BYTE, + .elem_len = TEST_MED_DATA_SIZE_V01, + .elem_size = sizeof(u8), + .array_type = VAR_LEN_ARRAY, + .tlv_type = DATA_REQ1_TLV_TYPE, + .offset = offsetof(struct test_data_req_msg_v01, + data), + }, + { + .data_type = QMI_OPT_FLAG, + .elem_len = 1, + .elem_size = sizeof(u8), + .array_type = NO_ARRAY, + .tlv_type = DATA_OPT1_TLV_TYPE, + .offset = offsetof(struct test_data_req_msg_v01, + client_name_valid), + }, + { + .data_type = QMI_STRUCT, + .elem_len = 1, + .elem_size = sizeof(struct test_name_type_v01), + .array_type = NO_ARRAY, + .tlv_type = DATA_OPT1_TLV_TYPE, + .offset = offsetof(struct test_data_req_msg_v01, + client_name), + .ei_array = test_name_type_v01_ei, + }, + {} +}; + +struct test_data_resp_msg_v01 { + struct qmi_response_type_v01 resp; + + u8 data_valid; + u32 data_len; + u8 data[TEST_MED_DATA_SIZE_V01]; + + u8 service_name_valid; + struct test_name_type_v01 service_name; +}; + +static struct qmi_elem_info test_data_resp_msg_v01_ei[] = { + { + .data_type = QMI_STRUCT, + .elem_len = 1, + .elem_size = sizeof(struct qmi_response_type_v01), + .array_type = NO_ARRAY, + .tlv_type = DATA_RESP1_TLV_TYPE, + .offset = offsetof(struct test_data_resp_msg_v01, + resp), + .ei_array = qmi_response_type_v01_ei, + }, + { + .data_type = QMI_OPT_FLAG, + .elem_len = 1, + .elem_size = sizeof(u8), + .array_type = NO_ARRAY, + .tlv_type = DATA_OPT1_TLV_TYPE, + .offset = offsetof(struct test_data_resp_msg_v01, + data_valid), + }, + { + .data_type = QMI_DATA_LEN, + .elem_len = 1, + .elem_size = sizeof(u32), + .array_type = NO_ARRAY, + .tlv_type = DATA_OPT1_TLV_TYPE, + .offset = offsetof(struct test_data_resp_msg_v01, + data_len), + }, + { + .data_type = QMI_UNSIGNED_1_BYTE, + .elem_len = TEST_MED_DATA_SIZE_V01, + .elem_size = sizeof(u8), + .array_type = VAR_LEN_ARRAY, + .tlv_type = DATA_OPT1_TLV_TYPE, + .offset = offsetof(struct test_data_resp_msg_v01, + data), + }, + { + .data_type = QMI_OPT_FLAG, + .elem_len = 1, + .elem_size = sizeof(u8), + .array_type = NO_ARRAY, + .tlv_type = DATA_OPT2_TLV_TYPE, + .offset = offsetof(struct test_data_resp_msg_v01, + service_name_valid), + }, + { + .data_type = QMI_STRUCT, + .elem_len = 1, + .elem_size = sizeof(struct test_name_type_v01), + .array_type = NO_ARRAY, + .tlv_type = DATA_OPT2_TLV_TYPE, + .offset = offsetof(struct test_data_resp_msg_v01, + service_name), + .ei_array = test_name_type_v01_ei, + }, + {} +}; + +/* + * ping_write() - ping_pong debugfs file write handler + * @file: debugfs file context + * @user_buf: reference to the user data (ignored) + * @count: number of bytes in @user_buf + * @ppos: offset in @file to write + * + * This function allows user space to send out a ping_pong QMI encoded message + * to the associated remote test service and will return with the result of the + * transaction. It serves as an example of how to provide a custom response + * handler. + * + * Return: @count, or negative errno on failure. + */ +static ssize_t ping_write(struct file *file, const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct qmi_handle *qmi = file->private_data; + struct test_ping_req_msg_v01 req = {}; + struct qmi_txn txn; + int ret; + + memcpy(req.ping, "ping", sizeof(req.ping)); + + ret = qmi_txn_init(qmi, &txn, NULL, NULL); + if (ret < 0) + return ret; + + ret = qmi_send_request(qmi, NULL, &txn, + TEST_PING_REQ_MSG_ID_V01, + TEST_PING_REQ_MAX_MSG_LEN_V01, + test_ping_req_msg_v01_ei, &req); + if (ret < 0) { + qmi_txn_cancel(&txn); + return ret; + } + + ret = qmi_txn_wait(&txn, 5 * HZ); + if (ret < 0) + count = ret; + + return count; +} + +static const struct file_operations ping_fops = { + .open = simple_open, + .write = ping_write, +}; + +static void ping_pong_cb(struct qmi_handle *qmi, struct sockaddr_qrtr *sq, + struct qmi_txn *txn, const void *data) +{ + const struct test_ping_resp_msg_v01 *resp = data; + + if (!txn) { + pr_err("spurious ping response\n"); + return; + } + + if (resp->resp.result == QMI_RESULT_FAILURE_V01) + txn->result = -ENXIO; + else if (!resp->pong_valid || memcmp(resp->pong, "pong", 4)) + txn->result = -EINVAL; + + complete(&txn->completion); +} + +/* + * data_write() - data debugfs file write handler + * @file: debugfs file context + * @user_buf: reference to the user data + * @count: number of bytes in @user_buf + * @ppos: offset in @file to write + * + * This function allows user space to send out a data QMI encoded message to + * the associated remote test service and will return with the result of the + * transaction. It serves as an example of how to have the QMI helpers decode a + * transaction response into a provided object automatically. + * + * Return: @count, or negative errno on failure. + */ +static ssize_t data_write(struct file *file, const char __user *user_buf, + size_t count, loff_t *ppos) + +{ + struct qmi_handle *qmi = file->private_data; + struct test_data_resp_msg_v01 *resp; + struct test_data_req_msg_v01 *req; + struct qmi_txn txn; + int ret; + + req = kzalloc(sizeof(*req), GFP_KERNEL); + if (!req) + return -ENOMEM; + + resp = kzalloc(sizeof(*resp), GFP_KERNEL); + if (!resp) { + kfree(req); + return -ENOMEM; + } + + req->data_len = min_t(size_t, sizeof(req->data), count); + if (copy_from_user(req->data, user_buf, req->data_len)) { + ret = -EFAULT; + goto out; + } + + ret = qmi_txn_init(qmi, &txn, test_data_resp_msg_v01_ei, resp); + if (ret < 0) + goto out; + + ret = qmi_send_request(qmi, NULL, &txn, + TEST_DATA_REQ_MSG_ID_V01, + TEST_DATA_REQ_MAX_MSG_LEN_V01, + test_data_req_msg_v01_ei, req); + if (ret < 0) { + qmi_txn_cancel(&txn); + goto out; + } + + ret = qmi_txn_wait(&txn, 5 * HZ); + if (ret < 0) { + goto out; + } else if (!resp->data_valid || + resp->data_len != req->data_len || + memcmp(resp->data, req->data, req->data_len)) { + pr_err("response data doesn't match expectation\n"); + ret = -EINVAL; + goto out; + } + + ret = count; + +out: + kfree(resp); + kfree(req); + + return ret; +} + +static const struct file_operations data_fops = { + .open = simple_open, + .write = data_write, +}; + +static struct qmi_msg_handler qmi_sample_handlers[] = { + { + .type = QMI_RESPONSE, + .msg_id = TEST_PING_REQ_MSG_ID_V01, + .ei = test_ping_resp_msg_v01_ei, + .decoded_size = sizeof(struct test_ping_req_msg_v01), + .fn = ping_pong_cb + }, + {} +}; + +struct qmi_sample { + struct qmi_handle qmi; + + struct dentry *de_dir; + struct dentry *de_data; + struct dentry *de_ping; +}; + +static struct dentry *qmi_debug_dir; + +static int qmi_sample_probe(struct platform_device *pdev) +{ + struct sockaddr_qrtr *sq; + struct qmi_sample *sample; + char path[20]; + int ret; + + sample = devm_kzalloc(&pdev->dev, sizeof(*sample), GFP_KERNEL); + if (!sample) + return -ENOMEM; + + ret = qmi_handle_init(&sample->qmi, TEST_DATA_REQ_MAX_MSG_LEN_V01, + NULL, + qmi_sample_handlers); + if (ret < 0) + return ret; + + sq = dev_get_platdata(&pdev->dev); + ret = kernel_connect(sample->qmi.sock, (struct sockaddr *)sq, + sizeof(*sq), 0); + if (ret < 0) { + pr_err("failed to connect to remote service port\n"); + goto err_release_qmi_handle; + } + + snprintf(path, sizeof(path), "%d:%d", sq->sq_node, sq->sq_port); + + sample->de_dir = debugfs_create_dir(path, qmi_debug_dir); + if (IS_ERR(sample->de_dir)) { + ret = PTR_ERR(sample->de_dir); + goto err_release_qmi_handle; + } + + sample->de_data = debugfs_create_file("data", 0600, sample->de_dir, + sample, &data_fops); + if (IS_ERR(sample->de_data)) { + ret = PTR_ERR(sample->de_data); + goto err_remove_de_dir; + } + + sample->de_ping = debugfs_create_file("ping", 0600, sample->de_dir, + sample, &ping_fops); + if (IS_ERR(sample->de_ping)) { + ret = PTR_ERR(sample->de_ping); + goto err_remove_de_data; + } + + platform_set_drvdata(pdev, sample); + + return 0; + +err_remove_de_data: + debugfs_remove(sample->de_data); +err_remove_de_dir: + debugfs_remove(sample->de_dir); +err_release_qmi_handle: + qmi_handle_release(&sample->qmi); + + return ret; +} + +static int qmi_sample_remove(struct platform_device *pdev) +{ + struct qmi_sample *sample = platform_get_drvdata(pdev); + + debugfs_remove(sample->de_ping); + debugfs_remove(sample->de_data); + debugfs_remove(sample->de_dir); + + qmi_handle_release(&sample->qmi); + + return 0; +} + +static struct platform_driver qmi_sample_driver = { + .probe = qmi_sample_probe, + .remove = qmi_sample_remove, + .driver = { + .name = "qmi_sample_client", + }, +}; + +static int qmi_sample_new_server(struct qmi_handle *qmi, + struct qmi_service *service) +{ + struct platform_device *pdev; + struct sockaddr_qrtr sq = { AF_QIPCRTR, service->node, service->port }; + int ret; + + pdev = platform_device_alloc("qmi_sample_client", PLATFORM_DEVID_AUTO); + if (!pdev) + return -ENOMEM; + + ret = platform_device_add_data(pdev, &sq, sizeof(sq)); + if (ret) + goto err_put_device; + + ret = platform_device_add(pdev); + if (ret) + goto err_put_device; + + service->priv = pdev; + + return 0; + +err_put_device: + platform_device_put(pdev); + + return ret; +} + +static void qmi_sample_del_server(struct qmi_handle *qmi, + struct qmi_service *service) +{ + struct platform_device *pdev = service->priv; + + platform_device_unregister(pdev); +} + +static struct qmi_handle lookup_client; + +static struct qmi_ops lookup_ops = { + .new_server = qmi_sample_new_server, + .del_server = qmi_sample_del_server, +}; + +static int qmi_sample_init(void) +{ + int ret; + + qmi_debug_dir = debugfs_create_dir("qmi_sample", NULL); + if (IS_ERR(qmi_debug_dir)) { + pr_err("failed to create qmi_sample dir\n"); + return PTR_ERR(qmi_debug_dir); + } + + ret = platform_driver_register(&qmi_sample_driver); + if (ret) + goto err_remove_debug_dir; + + ret = qmi_handle_init(&lookup_client, 0, &lookup_ops, NULL); + if (ret < 0) + goto err_unregister_driver; + + qmi_add_lookup(&lookup_client, 15, 0, 0); + + return 0; + +err_unregister_driver: + platform_driver_unregister(&qmi_sample_driver); +err_remove_debug_dir: + debugfs_remove(qmi_debug_dir); + + return ret; +} + +static void qmi_sample_exit(void) +{ + qmi_handle_release(&lookup_client); + + platform_driver_unregister(&qmi_sample_driver); + + debugfs_remove(qmi_debug_dir); +} + +module_init(qmi_sample_init); +module_exit(qmi_sample_exit); + +MODULE_DESCRIPTION("Sample QMI client driver"); +MODULE_LICENSE("GPL v2"); |