LXR linux/drivers/hid/intel-ish-hid/ishtp/client.h

   1/*
   2 * ISHTP client logic
   3 *
   4 * Copyright (c) 2003-2016, 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#ifndef _ISHTP_CLIENT_H_
  17#define _ISHTP_CLIENT_H_
  18
  19#include <linux/types.h>
  20#include "ishtp-dev.h"
  21
  22/* Client state */
  23enum cl_state {
  24        ISHTP_CL_INITIALIZING = 0,
  25        ISHTP_CL_CONNECTING,
  26        ISHTP_CL_CONNECTED,
  27        ISHTP_CL_DISCONNECTING,
  28        ISHTP_CL_DISCONNECTED
  29};
  30
  31/* Tx and Rx ring size */
  32#define CL_DEF_RX_RING_SIZE     2
  33#define CL_DEF_TX_RING_SIZE     2
  34#define CL_MAX_RX_RING_SIZE     32
  35#define CL_MAX_TX_RING_SIZE     32
  36
  37#define DMA_SLOT_SIZE           4096
  38/* Number of IPC fragments after which it's worth sending via DMA */
  39#define DMA_WORTH_THRESHOLD     3
  40
  41/* DMA/IPC Tx paths. Other the default means enforcement */
  42#define CL_TX_PATH_DEFAULT      0
  43#define CL_TX_PATH_IPC          1
  44#define CL_TX_PATH_DMA          2
  45
  46/* Client Tx buffer list entry */
  47struct ishtp_cl_tx_ring {
  48        struct list_head        list;
  49        struct ishtp_msg_data   send_buf;
  50};
  51
  52/* ISHTP client instance */
  53struct ishtp_cl {
  54        struct list_head        link;
  55        struct ishtp_device     *dev;
  56        enum cl_state           state;
  57        int                     status;
  58
  59        /* Link to ISHTP bus device */
  60        struct ishtp_cl_device  *device;
  61
  62        /* ID of client connected */
  63        uint8_t host_client_id;
  64        uint8_t fw_client_id;
  65        uint8_t ishtp_flow_ctrl_creds;
  66        uint8_t out_flow_ctrl_creds;
  67
  68        /* dma */
  69        int     last_tx_path;
  70        /* 0: ack wasn't received,1:ack was received */
  71        int     last_dma_acked;
  72        unsigned char   *last_dma_addr;
  73        /* 0: ack wasn't received,1:ack was received */
  74        int     last_ipc_acked;
  75
  76        /* Rx ring buffer pool */
  77        unsigned int    rx_ring_size;
  78        struct ishtp_cl_rb      free_rb_list;
  79        spinlock_t      free_list_spinlock;
  80        /* Rx in-process list */
  81        struct ishtp_cl_rb      in_process_list;
  82        spinlock_t      in_process_spinlock;
  83
  84        /* Client Tx buffers list */
  85        unsigned int    tx_ring_size;
  86        struct ishtp_cl_tx_ring tx_list, tx_free_list;
  87        int             tx_ring_free_size;
  88        spinlock_t      tx_list_spinlock;
  89        spinlock_t      tx_free_list_spinlock;
  90        size_t  tx_offs;        /* Offset in buffer at head of 'tx_list' */
  91
  92        /**
  93         * if we get a FC, and the list is not empty, we must know whether we
  94         * are at the middle of sending.
  95         * if so -need to increase FC counter, otherwise, need to start sending
  96         * the first msg in list
  97         * (!)This is for counting-FC implementation only. Within single-FC the
  98         * other party may NOT send FC until it receives complete message
  99         */
 100        int     sending;
 101
 102        /* Send FC spinlock */
 103        spinlock_t      fc_spinlock;
 104
 105        /* wait queue for connect and disconnect response from FW */
 106        wait_queue_head_t       wait_ctrl_res;
 107
 108        /* Error stats */
 109        unsigned int    err_send_msg;
 110        unsigned int    err_send_fc;
 111
 112        /* Send/recv stats */
 113        unsigned int    send_msg_cnt_ipc;
 114        unsigned int    send_msg_cnt_dma;
 115        unsigned int    recv_msg_cnt_ipc;
 116        unsigned int    recv_msg_cnt_dma;
 117        unsigned int    recv_msg_num_frags;
 118        unsigned int    ishtp_flow_ctrl_cnt;
 119        unsigned int    out_flow_ctrl_cnt;
 120
 121        /* Rx msg ... out FC timing */
 122        ktime_t ts_rx;
 123        ktime_t ts_out_fc;
 124        ktime_t ts_max_fc_delay;
 125        void *client_data;
 126};
 127
 128/* Client connection managenment internal functions */
 129int ishtp_can_client_connect(struct ishtp_device *ishtp_dev, guid_t *uuid);
 130int ishtp_fw_cl_by_id(struct ishtp_device *dev, uint8_t client_id);
 131void ishtp_cl_send_msg(struct ishtp_device *dev, struct ishtp_cl *cl);
 132void recv_ishtp_cl_msg(struct ishtp_device *dev,
 133                       struct ishtp_msg_hdr *ishtp_hdr);
 134int ishtp_cl_read_start(struct ishtp_cl *cl);
 135
 136/* Ring Buffer I/F */
 137int ishtp_cl_alloc_rx_ring(struct ishtp_cl *cl);
 138int ishtp_cl_alloc_tx_ring(struct ishtp_cl *cl);
 139void ishtp_cl_free_rx_ring(struct ishtp_cl *cl);
 140void ishtp_cl_free_tx_ring(struct ishtp_cl *cl);
 141int ishtp_cl_get_tx_free_buffer_size(struct ishtp_cl *cl);
 142int ishtp_cl_get_tx_free_rings(struct ishtp_cl *cl);
 143
 144/* DMA I/F functions */
 145void recv_ishtp_cl_msg_dma(struct ishtp_device *dev, void *msg,
 146                           struct dma_xfer_hbm *hbm);
 147void ishtp_cl_alloc_dma_buf(struct ishtp_device *dev);
 148void ishtp_cl_free_dma_buf(struct ishtp_device *dev);
 149void *ishtp_cl_get_dma_send_buf(struct ishtp_device *dev,
 150                                uint32_t size);
 151void ishtp_cl_release_dma_acked_mem(struct ishtp_device *dev,
 152                                    void *msg_addr,
 153                                    uint8_t size);
 154
 155/* Request blocks alloc/free I/F */
 156struct ishtp_cl_rb *ishtp_io_rb_init(struct ishtp_cl *cl);
 157void ishtp_io_rb_free(struct ishtp_cl_rb *priv_rb);
 158int ishtp_io_rb_alloc_buf(struct ishtp_cl_rb *rb, size_t length);
 159
 160/**
 161 * ishtp_cl_cmp_id - tells if file private data have same id
 162 * returns true  - if ids are the same and not NULL
 163 */
 164static inline bool ishtp_cl_cmp_id(const struct ishtp_cl *cl1,
 165                                   const struct ishtp_cl *cl2)
 166{
 167        return cl1 && cl2 &&
 168                (cl1->host_client_id == cl2->host_client_id) &&
 169                (cl1->fw_client_id == cl2->fw_client_id);
 170}
 171
 172/* exported functions from ISHTP under client management scope */
 173struct ishtp_cl *ishtp_cl_allocate(struct ishtp_device *dev);
 174void ishtp_cl_free(struct ishtp_cl *cl);
 175int ishtp_cl_link(struct ishtp_cl *cl, int id);
 176void ishtp_cl_unlink(struct ishtp_cl *cl);
 177int ishtp_cl_disconnect(struct ishtp_cl *cl);
 178int ishtp_cl_connect(struct ishtp_cl *cl);
 179int ishtp_cl_send(struct ishtp_cl *cl, uint8_t *buf, size_t length);
 180int ishtp_cl_flush_queues(struct ishtp_cl *cl);
 181
 182/* exported functions from ISHTP client buffer management scope */
 183int ishtp_cl_io_rb_recycle(struct ishtp_cl_rb *rb);
 184bool ishtp_cl_tx_empty(struct ishtp_cl *cl);
 185struct ishtp_cl_rb *ishtp_cl_rx_get_rb(struct ishtp_cl *cl);
 186
 187#endif /* _ISHTP_CLIENT_H_ */
 188