/*
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* Copyright (C) 2016 Spreadtrum Communications Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/slab.h>
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#include <linux/kfifo.h>
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#include "sitm.h"
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static const uint8_t preamble_sizes[] =
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{
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HCI_COMMAND_PREAMBLE_SIZE,
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HCI_ACL_PREAMBLE_SIZE,
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HCI_SCO_PREAMBLE_SIZE,
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HCI_EVENT_PREAMBLE_SIZE
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};
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static struct packet_receive_data_t *rd;
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int sitm_ini(void)
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{
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rd = kmalloc(sizeof(struct packet_receive_data_t),
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GFP_KERNEL);
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memset(rd, 0, sizeof(struct packet_receive_data_t));
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if (kfifo_alloc(&rd->fifo,
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HCI_HAL_SERIAL_BUFFER_SIZE, GFP_KERNEL))
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{
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pr_err("no memory for sitm ring buf");
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}
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return 0;
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}
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int sitm_cleanup(void)
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{
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if (rd == NULL)
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{
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pr_err("bt sitm_cleanup fail: rd NULL");
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return -1;
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}
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kfifo_free(&rd->fifo);
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kfree(rd);
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rd = NULL;
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return 0;
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}
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static int data_ready(uint8_t *buf, uint32_t count)
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{
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int ret = kfifo_out(&rd->fifo, buf, count);
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return ret;
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}
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void parse_frame(data_ready_cb data_ready, frame_complete_cb frame_complete)
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{
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uint8_t byte;
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size_t buffer_size, bytes_read;
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while (data_ready(&byte, 1) == 1)
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{
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switch (rd->state)
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{
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case BRAND_NEW:
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if (byte > DATA_TYPE_EVENT
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|| byte < DATA_TYPE_COMMAND)
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{
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pr_err("unknown head: 0x%02x\n", byte);
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break;
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}
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rd->type = byte;
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rd->bytes_remaining =
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preamble_sizes[PACKET_TYPE_TO_INDEX(rd->type)]
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+ 1;
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memset(rd->preamble, 0, PREAMBLE_BUFFER_SIZE);
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rd->index = 0;
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rd->state = PREAMBLE;
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case PREAMBLE:
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rd->preamble[rd->index] = byte;
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rd->index++;
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rd->bytes_remaining--;
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if (rd->bytes_remaining == 0)
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{
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rd->bytes_remaining =
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(rd->type == DATA_TYPE_ACL) ?
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RETRIEVE_ACL_LENGTH(rd->preamble)
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: byte;
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buffer_size = rd->index
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+ rd->bytes_remaining;
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memcpy(rd->buffer,
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rd->preamble,
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rd->index);
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rd->state =
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rd->bytes_remaining > 0 ?
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BODY : FINISHED;
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}
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break;
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case BODY:
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rd->buffer[rd->index] = byte;
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rd->index++;
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rd->bytes_remaining--;
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bytes_read = data_ready((rd->buffer
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+ rd->index),
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rd->bytes_remaining);
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rd->index += bytes_read;
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rd->bytes_remaining -= bytes_read;
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rd->state =
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rd->bytes_remaining == 0 ?
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FINISHED : rd->state;
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break;
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case IGNORE:
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pr_err("PARSE IGNORE\n");
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rd->bytes_remaining--;
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if (rd->bytes_remaining == 0)
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{
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rd->state = BRAND_NEW;
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return;
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}
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break;
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case FINISHED:
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pr_err("%s state.\n", __func__);
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break;
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default:
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pr_err("PARSE DEFAULT\n");
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break;
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}
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if (rd->state == FINISHED)
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{
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if (rd->type == DATA_TYPE_COMMAND
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|| rd->type == DATA_TYPE_ACL)
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{
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uint32_t tail = BYTE_ALIGNMENT
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- ((rd->index
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+ BYTE_ALIGNMENT)
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% BYTE_ALIGNMENT);
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while (tail--)
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{
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rd->buffer[rd->index++] = 0;
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}
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}
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frame_complete(rd->buffer,
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rd->index);
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rd->state = BRAND_NEW;
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}
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}
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}
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int sitm_write(const uint8_t *buf, int count, frame_complete_cb frame_complete)
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{
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int ret;
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if (!rd)
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{
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pr_err("hci fifo no memory\n");
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return count;
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}
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ret = kfifo_avail(&rd->fifo);
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if (ret == 0)
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{
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pr_err("hci fifo no memory\n");
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return ret;
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}
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else if (ret < count)
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{
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pr_err("hci fifo low memory\n");
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count = ret;
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}
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kfifo_in(&rd->fifo, buf, count);
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parse_frame(data_ready, frame_complete);
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return count;
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}
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