include/linux/soc/qcom/qmi.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
   4  * Copyright (c) 2017, Linaro Ltd.
   5  */
   6 #ifndef __QMI_HELPERS_H__
   7 #define __QMI_HELPERS_H__
   8
   9 #include <linux/completion.h>
  10 #include <linux/idr.h>
  11 #include <linux/list.h>
  12 #include <linux/qrtr.h>
  13 #include <linux/types.h>
  14 #include <linux/workqueue.h>
  15
  16 struct socket;
  17
  18 /**
  19  * qmi_header - wireformat header of QMI messages
  20  * @type:       type of message
  21  * @txn_id:     transaction id
  22  * @msg_id:     message id
  23  * @msg_len:    length of message payload following header
  24  */
  25 struct qmi_header {
  26         u8 type;
  27         u16 txn_id;
  28         u16 msg_id;
  29         u16 msg_len;
  30 } __packed;
  31
  32 #define QMI_REQUEST     0
  33 #define QMI_RESPONSE    2
  34 #define QMI_INDICATION  4
  35
  36 #define QMI_COMMON_TLV_TYPE 0
  37
  38 enum qmi_elem_type {
  39         QMI_EOTI,
  40         QMI_OPT_FLAG,
  41         QMI_DATA_LEN,
  42         QMI_UNSIGNED_1_BYTE,
  43         QMI_UNSIGNED_2_BYTE,
  44         QMI_UNSIGNED_4_BYTE,
  45         QMI_UNSIGNED_8_BYTE,
  46         QMI_SIGNED_2_BYTE_ENUM,
  47         QMI_SIGNED_4_BYTE_ENUM,
  48         QMI_STRUCT,
  49         QMI_STRING,
  50 };
  51
  52 enum qmi_array_type {
  53         NO_ARRAY,
  54         STATIC_ARRAY,
  55         VAR_LEN_ARRAY,
  56 };
  57
  58 /**
  59  * struct qmi_elem_info - describes how to encode a single QMI element
  60  * @data_type:  Data type of this element.
  61  * @elem_len:   Array length of this element, if an array.
  62  * @elem_size:  Size of a single instance of this data type.
  63  * @array_type: Array type of this element.
  64  * @tlv_type:   QMI message specific type to identify which element
  65  *              is present in an incoming message.
  66  * @offset:     Specifies the offset of the first instance of this
  67  *              element in the data structure.
  68  * @ei_array:   Null-terminated array of @qmi_elem_info to describe nested
  69  *              structures.
  70  */
  71 struct qmi_elem_info {
  72         enum qmi_elem_type data_type;
  73         u32 elem_len;
  74         u32 elem_size;
  75         enum qmi_array_type array_type;
  76         u8 tlv_type;
  77         u32 offset;
  78         struct qmi_elem_info *ei_array;
  79 };
  80
  81 #define QMI_RESULT_SUCCESS_V01                  0
  82 #define QMI_RESULT_FAILURE_V01                  1
  83
  84 #define QMI_ERR_NONE_V01                        0
  85 #define QMI_ERR_MALFORMED_MSG_V01               1
  86 #define QMI_ERR_NO_MEMORY_V01                   2
  87 #define QMI_ERR_INTERNAL_V01                    3
  88 #define QMI_ERR_CLIENT_IDS_EXHAUSTED_V01        5
  89 #define QMI_ERR_INVALID_ID_V01                  41
  90 #define QMI_ERR_ENCODING_V01                    58
  91 #define QMI_ERR_INCOMPATIBLE_STATE_V01          90
  92 #define QMI_ERR_NOT_SUPPORTED_V01               94
  93
  94 /**
  95  * qmi_response_type_v01 - common response header (decoded)
  96  * @result:     result of the transaction
  97  * @error:      error value, when @result is QMI_RESULT_FAILURE_V01
  98  */
  99 struct qmi_response_type_v01 {
 100         u16 result;
 101         u16 error;
 102 };
 103
 104 extern struct qmi_elem_info qmi_response_type_v01_ei[];
 105
 106 /**
 107  * struct qmi_service - context to track lookup-results
 108  * @service:    service type
 109  * @version:    version of the @service
 110  * @instance:   instance id of the @service
 111  * @node:       node of the service
 112  * @port:       port of the service
 113  * @priv:       handle for client's use
 114  * @list_node:  list_head for house keeping
 115  */
 116 struct qmi_service {
 117         unsigned int service;
 118         unsigned int version;
 119         unsigned int instance;
 120
 121         unsigned int node;
 122         unsigned int port;
 123
 124         void *priv;
 125         struct list_head list_node;
 126 };
 127
 128 struct qmi_handle;
 129
 130 /**
 131  * struct qmi_ops - callbacks for qmi_handle
 132  * @new_server:         inform client of a new_server lookup-result, returning
 133  *                      successfully from this call causes the library to call
 134  *                      @del_server as the service is removed from the
 135  *                      lookup-result. @priv of the qmi_service can be used by
 136  *                      the client
 137  * @del_server:         inform client of a del_server lookup-result
 138  * @net_reset:          inform client that the name service was restarted and
 139  *                      that and any state needs to be released
 140  * @msg_handler:        invoked for incoming messages, allows a client to
 141  *                      override the usual QMI message handler
 142  * @bye:                inform a client that all clients from a node are gone
 143  * @del_client:         inform a client that a particular client is gone
 144  */
 145 struct qmi_ops {
 146         int (*new_server)(struct qmi_handle *qmi, struct qmi_service *svc);
 147         void (*del_server)(struct qmi_handle *qmi, struct qmi_service *svc);
 148         void (*net_reset)(struct qmi_handle *qmi);
 149         void (*msg_handler)(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
 150                             const void *data, size_t count);
 151         void (*bye)(struct qmi_handle *qmi, unsigned int node);
 152         void (*del_client)(struct qmi_handle *qmi,
 153                            unsigned int node, unsigned int port);
 154 };
 155
 156 /**
 157  * struct qmi_txn - transaction context
 158  * @qmi:        QMI handle this transaction is associated with
 159  * @id:         transaction id
 160  * @lock:       for synchronization between handler and waiter of messages
 161  * @completion: completion object as the transaction receives a response
 162  * @result:     result code for the completed transaction
 163  * @ei:         description of the QMI encoded response (optional)
 164  * @dest:       destination buffer to decode message into (optional)
 165  */
 166 struct qmi_txn {
 167         struct qmi_handle *qmi;
 168
 169         int id;
 170
 171         struct mutex lock;
 172         struct completion completion;
 173         int result;
 174
 175         struct qmi_elem_info *ei;
 176         void *dest;
 177 };
 178
 179 /**
 180  * struct qmi_msg_handler - description of QMI message handler
 181  * @type:       type of message
 182  * @msg_id:     message id
 183  * @ei:         description of the QMI encoded message
 184  * @decoded_size:       size of the decoded object
 185  * @fn:         function to invoke as the message is decoded
 186  */
 187 struct qmi_msg_handler {
 188         unsigned int type;
 189         unsigned int msg_id;
 190
 191         struct qmi_elem_info *ei;
 192
 193         size_t decoded_size;
 194         void (*fn)(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
 195                    struct qmi_txn *txn, const void *decoded);
 196 };
 197
 198 /**
 199  * struct qmi_handle - QMI context
 200  * @sock:       socket handle
 201  * @sock_lock:  synchronization of @sock modifications
 202  * @sq:         sockaddr of @sock
 203  * @work:       work for handling incoming messages
 204  * @wq:         workqueue to post @work on
 205  * @recv_buf:   scratch buffer for handling incoming messages
 206  * @recv_buf_size:      size of @recv_buf
 207  * @lookups:            list of registered lookup requests
 208  * @lookup_results:     list of lookup-results advertised to the client
 209  * @services:           list of registered services (by this client)
 210  * @ops:        reference to callbacks
 211  * @txns:       outstanding transactions
 212  * @txn_lock:   lock for modifications of @txns
 213  * @handlers:   list of handlers for incoming messages
 214  */
 215 struct qmi_handle {
 216         struct socket *sock;
 217         struct mutex sock_lock;
 218
 219         struct sockaddr_qrtr sq;
 220
 221         struct work_struct work;
 222         struct workqueue_struct *wq;
 223
 224         void *recv_buf;
 225         size_t recv_buf_size;
 226
 227         struct list_head lookups;
 228         struct list_head lookup_results;
 229         struct list_head services;
 230
 231         struct qmi_ops ops;
 232
 233         struct idr txns;
 234         struct mutex txn_lock;
 235
 236         const struct qmi_msg_handler *handlers;
 237 };
 238
 239 int qmi_add_lookup(struct qmi_handle *qmi, unsigned int service,
 240                    unsigned int version, unsigned int instance);
 241 int qmi_add_server(struct qmi_handle *qmi, unsigned int service,
 242                    unsigned int version, unsigned int instance);
 243
 244 int qmi_handle_init(struct qmi_handle *qmi, size_t max_msg_len,
 245                     const struct qmi_ops *ops,
 246                     const struct qmi_msg_handler *handlers);
 247 void qmi_handle_release(struct qmi_handle *qmi);
 248
 249 ssize_t qmi_send_request(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
 250                          struct qmi_txn *txn, int msg_id, size_t len,
 251                          struct qmi_elem_info *ei, const void *c_struct);
 252 ssize_t qmi_send_response(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
 253                           struct qmi_txn *txn, int msg_id, size_t len,
 254                           struct qmi_elem_info *ei, const void *c_struct);
 255 ssize_t qmi_send_indication(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
 256                             int msg_id, size_t len, struct qmi_elem_info *ei,
 257                             const void *c_struct);
 258
 259 void *qmi_encode_message(int type, unsigned int msg_id, size_t *len,
 260                          unsigned int txn_id, struct qmi_elem_info *ei,
 261                          const void *c_struct);
 262
 263 int qmi_decode_message(const void *buf, size_t len,
 264                        struct qmi_elem_info *ei, void *c_struct);
 265
 266 int qmi_txn_init(struct qmi_handle *qmi, struct qmi_txn *txn,
 267                  struct qmi_elem_info *ei, void *c_struct);
 268 int qmi_txn_wait(struct qmi_txn *txn, unsigned long timeout);
 269 void qmi_txn_cancel(struct qmi_txn *txn);
 270
 271 #endif