455 lines
12 KiB
C
455 lines
12 KiB
C
/*
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* Bluetooth serial HCI transport.
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* CSR41814 HCI with H4p vendor extensions.
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*
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* Copyright (C) 2008 Andrzej Zaborowski <balrog@zabor.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 or
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* (at your option) version 3 of the License.
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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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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu-common.h"
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#include "qemu-char.h"
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#include "qemu-timer.h"
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#include "irq.h"
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#include "sysemu.h"
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#include "net.h"
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#include "bt.h"
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struct csrhci_s {
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int enable;
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qemu_irq *pins;
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int pin_state;
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int modem_state;
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CharDriverState chr;
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#define FIFO_LEN 4096
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int out_start;
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int out_len;
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int out_size;
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uint8_t outfifo[FIFO_LEN * 2];
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uint8_t inpkt[FIFO_LEN];
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int in_len;
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int in_hdr;
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int in_data;
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QEMUTimer *out_tm;
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int64_t baud_delay;
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bdaddr_t bd_addr;
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struct HCIInfo *hci;
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};
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/* H4+ packet types */
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enum {
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H4_CMD_PKT = 1,
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H4_ACL_PKT = 2,
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H4_SCO_PKT = 3,
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H4_EVT_PKT = 4,
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H4_NEG_PKT = 6,
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H4_ALIVE_PKT = 7,
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};
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/* CSR41814 negotiation start magic packet */
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static const uint8_t csrhci_neg_packet[] = {
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H4_NEG_PKT, 10,
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0x00, 0xa0, 0x01, 0x00, 0x00,
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0x4c, 0x00, 0x96, 0x00, 0x00,
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};
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/* CSR41814 vendor-specific command OCFs */
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enum {
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OCF_CSR_SEND_FIRMWARE = 0x000,
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};
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static inline void csrhci_fifo_wake(struct csrhci_s *s)
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{
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if (!s->enable || !s->out_len)
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return;
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/* XXX: Should wait for s->modem_state & CHR_TIOCM_RTS? */
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if (s->chr.chr_can_read && s->chr.chr_can_read(s->chr.handler_opaque) &&
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s->chr.chr_read) {
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s->chr.chr_read(s->chr.handler_opaque,
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s->outfifo + s->out_start ++, 1);
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s->out_len --;
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if (s->out_start >= s->out_size) {
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s->out_start = 0;
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s->out_size = FIFO_LEN;
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}
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}
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if (s->out_len)
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qemu_mod_timer(s->out_tm, qemu_get_clock(vm_clock) + s->baud_delay);
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}
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#define csrhci_out_packetz(s, len) memset(csrhci_out_packet(s, len), 0, len)
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static uint8_t *csrhci_out_packet(struct csrhci_s *s, int len)
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{
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int off = s->out_start + s->out_len;
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/* TODO: do the padding here, i.e. align len */
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s->out_len += len;
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if (off < FIFO_LEN) {
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if (off + len > FIFO_LEN && (s->out_size = off + len) > FIFO_LEN * 2) {
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fprintf(stderr, "%s: can't alloc %i bytes\n", __FUNCTION__, len);
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exit(-1);
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}
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return s->outfifo + off;
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}
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if (s->out_len > s->out_size) {
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fprintf(stderr, "%s: can't alloc %i bytes\n", __FUNCTION__, len);
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exit(-1);
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}
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return s->outfifo + off - s->out_size;
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}
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static inline uint8_t *csrhci_out_packet_csr(struct csrhci_s *s,
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int type, int len)
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{
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uint8_t *ret = csrhci_out_packetz(s, len + 2);
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*ret ++ = type;
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*ret ++ = len;
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return ret;
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}
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static inline uint8_t *csrhci_out_packet_event(struct csrhci_s *s,
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int evt, int len)
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{
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uint8_t *ret = csrhci_out_packetz(s,
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len + 1 + sizeof(struct hci_event_hdr));
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*ret ++ = H4_EVT_PKT;
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((struct hci_event_hdr *) ret)->evt = evt;
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((struct hci_event_hdr *) ret)->plen = len;
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return ret + sizeof(struct hci_event_hdr);
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}
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static void csrhci_in_packet_vendor(struct csrhci_s *s, int ocf,
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uint8_t *data, int len)
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{
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int offset;
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uint8_t *rpkt;
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switch (ocf) {
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case OCF_CSR_SEND_FIRMWARE:
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/* Check if this is the bd_address packet */
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if (len >= 18 + 8 && data[12] == 0x01 && data[13] == 0x00) {
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offset = 18;
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s->bd_addr.b[0] = data[offset + 7]; /* Beyond cmd packet end(!?) */
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s->bd_addr.b[1] = data[offset + 6];
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s->bd_addr.b[2] = data[offset + 4];
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s->bd_addr.b[3] = data[offset + 0];
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s->bd_addr.b[4] = data[offset + 3];
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s->bd_addr.b[5] = data[offset + 2];
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s->hci->bdaddr_set(s->hci, s->bd_addr.b);
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fprintf(stderr, "%s: bd_address loaded from firmware: "
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"%02x:%02x:%02x:%02x:%02x:%02x\n", __FUNCTION__,
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s->bd_addr.b[0], s->bd_addr.b[1], s->bd_addr.b[2],
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s->bd_addr.b[3], s->bd_addr.b[4], s->bd_addr.b[5]);
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}
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rpkt = csrhci_out_packet_event(s, EVT_VENDOR, 11);
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/* Status bytes: no error */
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rpkt[9] = 0x00;
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rpkt[10] = 0x00;
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break;
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default:
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fprintf(stderr, "%s: got a bad CMD packet\n", __FUNCTION__);
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return;
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}
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csrhci_fifo_wake(s);
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}
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static void csrhci_in_packet(struct csrhci_s *s, uint8_t *pkt)
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{
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uint8_t *rpkt;
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int opc;
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switch (*pkt ++) {
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case H4_CMD_PKT:
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opc = le16_to_cpu(((struct hci_command_hdr *) pkt)->opcode);
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if (cmd_opcode_ogf(opc) == OGF_VENDOR_CMD) {
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csrhci_in_packet_vendor(s, cmd_opcode_ocf(opc),
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pkt + sizeof(struct hci_command_hdr),
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s->in_len - sizeof(struct hci_command_hdr) - 1);
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return;
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}
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/* TODO: if the command is OCF_READ_LOCAL_COMMANDS or the likes,
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* we need to send it to the HCI layer and then add our supported
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* commands to the returned mask (such as OGF_VENDOR_CMD). With
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* bt-hci.c we could just have hooks for this kind of commands but
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* we can't with bt-host.c. */
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s->hci->cmd_send(s->hci, pkt, s->in_len - 1);
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break;
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case H4_EVT_PKT:
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goto bad_pkt;
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case H4_ACL_PKT:
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s->hci->acl_send(s->hci, pkt, s->in_len - 1);
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break;
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case H4_SCO_PKT:
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s->hci->sco_send(s->hci, pkt, s->in_len - 1);
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break;
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case H4_NEG_PKT:
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if (s->in_hdr != sizeof(csrhci_neg_packet) ||
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memcmp(pkt - 1, csrhci_neg_packet, s->in_hdr)) {
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fprintf(stderr, "%s: got a bad NEG packet\n", __FUNCTION__);
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return;
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}
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pkt += 2;
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rpkt = csrhci_out_packet_csr(s, H4_NEG_PKT, 10);
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*rpkt ++ = 0x20; /* Operational settings negotation Ok */
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memcpy(rpkt, pkt, 7); rpkt += 7;
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*rpkt ++ = 0xff;
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*rpkt ++ = 0xff;
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break;
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case H4_ALIVE_PKT:
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if (s->in_hdr != 4 || pkt[1] != 0x55 || pkt[2] != 0x00) {
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fprintf(stderr, "%s: got a bad ALIVE packet\n", __FUNCTION__);
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return;
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}
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rpkt = csrhci_out_packet_csr(s, H4_ALIVE_PKT, 2);
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*rpkt ++ = 0xcc;
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*rpkt ++ = 0x00;
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break;
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default:
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bad_pkt:
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/* TODO: error out */
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fprintf(stderr, "%s: got a bad packet\n", __FUNCTION__);
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break;
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}
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csrhci_fifo_wake(s);
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}
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static int csrhci_header_len(const uint8_t *pkt)
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{
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switch (pkt[0]) {
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case H4_CMD_PKT:
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return HCI_COMMAND_HDR_SIZE;
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case H4_EVT_PKT:
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return HCI_EVENT_HDR_SIZE;
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case H4_ACL_PKT:
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return HCI_ACL_HDR_SIZE;
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case H4_SCO_PKT:
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return HCI_SCO_HDR_SIZE;
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case H4_NEG_PKT:
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return pkt[1] + 1;
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case H4_ALIVE_PKT:
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return 3;
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}
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exit(-1);
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}
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static int csrhci_data_len(const uint8_t *pkt)
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{
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switch (*pkt ++) {
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case H4_CMD_PKT:
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/* It seems that vendor-specific command packets for H4+ are all
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* one byte longer than indicated in the standard header. */
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if (le16_to_cpu(((struct hci_command_hdr *) pkt)->opcode) == 0xfc00)
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return (((struct hci_command_hdr *) pkt)->plen + 1) & ~1;
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return ((struct hci_command_hdr *) pkt)->plen;
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case H4_EVT_PKT:
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return ((struct hci_event_hdr *) pkt)->plen;
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case H4_ACL_PKT:
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return le16_to_cpu(((struct hci_acl_hdr *) pkt)->dlen);
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case H4_SCO_PKT:
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return ((struct hci_sco_hdr *) pkt)->dlen;
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case H4_NEG_PKT:
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case H4_ALIVE_PKT:
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return 0;
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}
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exit(-1);
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}
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static int csrhci_write(struct CharDriverState *chr,
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const uint8_t *buf, int len)
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{
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struct csrhci_s *s = (struct csrhci_s *) chr->opaque;
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int plen = s->in_len;
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if (!s->enable)
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return 0;
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s->in_len += len;
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memcpy(s->inpkt + plen, buf, len);
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while (1) {
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if (s->in_len >= 2 && plen < 2)
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s->in_hdr = csrhci_header_len(s->inpkt) + 1;
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if (s->in_len >= s->in_hdr && plen < s->in_hdr)
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s->in_data = csrhci_data_len(s->inpkt) + s->in_hdr;
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if (s->in_len >= s->in_data) {
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csrhci_in_packet(s, s->inpkt);
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memmove(s->inpkt, s->inpkt + s->in_len, s->in_len - s->in_data);
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s->in_len -= s->in_data;
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s->in_hdr = INT_MAX;
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s->in_data = INT_MAX;
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plen = 0;
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} else
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break;
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}
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return len;
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}
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static void csrhci_out_hci_packet_event(void *opaque,
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const uint8_t *data, int len)
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{
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struct csrhci_s *s = (struct csrhci_s *) opaque;
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uint8_t *pkt = csrhci_out_packet(s, (len + 2) & ~1); /* Align */
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*pkt ++ = H4_EVT_PKT;
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memcpy(pkt, data, len);
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csrhci_fifo_wake(s);
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}
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static void csrhci_out_hci_packet_acl(void *opaque,
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const uint8_t *data, int len)
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{
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struct csrhci_s *s = (struct csrhci_s *) opaque;
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uint8_t *pkt = csrhci_out_packet(s, (len + 2) & ~1); /* Align */
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*pkt ++ = H4_ACL_PKT;
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pkt[len & ~1] = 0;
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memcpy(pkt, data, len);
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csrhci_fifo_wake(s);
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}
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static int csrhci_ioctl(struct CharDriverState *chr, int cmd, void *arg)
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{
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QEMUSerialSetParams *ssp;
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struct csrhci_s *s = (struct csrhci_s *) chr->opaque;
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int prev_state = s->modem_state;
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switch (cmd) {
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case CHR_IOCTL_SERIAL_SET_PARAMS:
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ssp = (QEMUSerialSetParams *) arg;
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s->baud_delay = get_ticks_per_sec() / ssp->speed;
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/* Moments later... (but shorter than 100ms) */
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s->modem_state |= CHR_TIOCM_CTS;
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break;
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case CHR_IOCTL_SERIAL_GET_TIOCM:
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*(int *) arg = s->modem_state;
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break;
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case CHR_IOCTL_SERIAL_SET_TIOCM:
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s->modem_state = *(int *) arg;
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if (~s->modem_state & prev_state & CHR_TIOCM_RTS)
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s->modem_state &= ~CHR_TIOCM_CTS;
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break;
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default:
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return -ENOTSUP;
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}
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return 0;
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}
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static void csrhci_reset(struct csrhci_s *s)
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{
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s->out_len = 0;
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s->out_size = FIFO_LEN;
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s->in_len = 0;
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s->baud_delay = get_ticks_per_sec();
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s->enable = 0;
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s->in_hdr = INT_MAX;
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s->in_data = INT_MAX;
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s->modem_state = 0;
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/* After a while... (but sooner than 10ms) */
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s->modem_state |= CHR_TIOCM_CTS;
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memset(&s->bd_addr, 0, sizeof(bdaddr_t));
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}
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static void csrhci_out_tick(void *opaque)
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{
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csrhci_fifo_wake((struct csrhci_s *) opaque);
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}
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static void csrhci_pins(void *opaque, int line, int level)
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{
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struct csrhci_s *s = (struct csrhci_s *) opaque;
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int state = s->pin_state;
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s->pin_state &= ~(1 << line);
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s->pin_state |= (!!level) << line;
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if ((state & ~s->pin_state) & (1 << csrhci_pin_reset)) {
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/* TODO: Disappear from lower layers */
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csrhci_reset(s);
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}
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if (s->pin_state == 3 && state != 3) {
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s->enable = 1;
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/* TODO: Wake lower layers up */
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}
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}
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qemu_irq *csrhci_pins_get(CharDriverState *chr)
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{
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struct csrhci_s *s = (struct csrhci_s *) chr->opaque;
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return s->pins;
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}
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CharDriverState *uart_hci_init(qemu_irq wakeup)
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{
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struct csrhci_s *s = (struct csrhci_s *)
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qemu_mallocz(sizeof(struct csrhci_s));
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s->chr.opaque = s;
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s->chr.chr_write = csrhci_write;
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s->chr.chr_ioctl = csrhci_ioctl;
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s->hci = qemu_next_hci();
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s->hci->opaque = s;
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s->hci->evt_recv = csrhci_out_hci_packet_event;
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s->hci->acl_recv = csrhci_out_hci_packet_acl;
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s->out_tm = qemu_new_timer(vm_clock, csrhci_out_tick, s);
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s->pins = qemu_allocate_irqs(csrhci_pins, s, __csrhci_pins);
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csrhci_reset(s);
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return &s->chr;
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}
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