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qemu/hw/bt/hid.c

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/*
* QEMU Bluetooth HID Profile wrapper for USB HID.
*
* Copyright (C) 2007-2008 OpenMoko, Inc.
* Written by Andrzej Zaborowski <andrew@openedhand.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 or
* (at your option) version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/timer.h"
#include "ui/console.h"
#include "hw/input/hid.h"
#include "hw/bt.h"
enum hid_transaction_req {
BT_HANDSHAKE = 0x0,
BT_HID_CONTROL = 0x1,
BT_GET_REPORT = 0x4,
BT_SET_REPORT = 0x5,
BT_GET_PROTOCOL = 0x6,
BT_SET_PROTOCOL = 0x7,
BT_GET_IDLE = 0x8,
BT_SET_IDLE = 0x9,
BT_DATA = 0xa,
BT_DATC = 0xb,
};
enum hid_transaction_handshake {
BT_HS_SUCCESSFUL = 0x0,
BT_HS_NOT_READY = 0x1,
BT_HS_ERR_INVALID_REPORT_ID = 0x2,
BT_HS_ERR_UNSUPPORTED_REQUEST = 0x3,
BT_HS_ERR_INVALID_PARAMETER = 0x4,
BT_HS_ERR_UNKNOWN = 0xe,
BT_HS_ERR_FATAL = 0xf,
};
enum hid_transaction_control {
BT_HC_NOP = 0x0,
BT_HC_HARD_RESET = 0x1,
BT_HC_SOFT_RESET = 0x2,
BT_HC_SUSPEND = 0x3,
BT_HC_EXIT_SUSPEND = 0x4,
BT_HC_VIRTUAL_CABLE_UNPLUG = 0x5,
};
enum hid_protocol {
BT_HID_PROTO_BOOT = 0,
BT_HID_PROTO_REPORT = 1,
};
enum hid_boot_reportid {
BT_HID_BOOT_INVALID = 0,
BT_HID_BOOT_KEYBOARD,
BT_HID_BOOT_MOUSE,
};
enum hid_data_pkt {
BT_DATA_OTHER = 0,
BT_DATA_INPUT,
BT_DATA_OUTPUT,
BT_DATA_FEATURE,
};
#define BT_HID_MTU 48
/* HID interface requests */
#define GET_REPORT 0xa101
#define GET_IDLE 0xa102
#define GET_PROTOCOL 0xa103
#define SET_REPORT 0x2109
#define SET_IDLE 0x210a
#define SET_PROTOCOL 0x210b
struct bt_hid_device_s {
struct bt_l2cap_device_s btdev;
struct bt_l2cap_conn_params_s *control;
struct bt_l2cap_conn_params_s *interrupt;
HIDState hid;
int proto;
int connected;
int data_type;
int intr_state;
struct {
int len;
uint8_t buffer[1024];
} dataother, datain, dataout, feature, intrdataout;
enum {
bt_state_ready,
bt_state_transaction,
bt_state_suspend,
} state;
};
static void bt_hid_reset(struct bt_hid_device_s *s)
{
struct bt_scatternet_s *net = s->btdev.device.net;
/* Go as far as... */
bt_l2cap_device_done(&s->btdev);
bt_l2cap_device_init(&s->btdev, net);
hid_reset(&s->hid);
s->proto = BT_HID_PROTO_REPORT;
s->state = bt_state_ready;
s->dataother.len = 0;
s->datain.len = 0;
s->dataout.len = 0;
s->feature.len = 0;
s->intrdataout.len = 0;
s->intr_state = 0;
}
static int bt_hid_out(struct bt_hid_device_s *s)
{
if (s->data_type == BT_DATA_OUTPUT) {
/* nothing */
;
}
if (s->data_type == BT_DATA_FEATURE) {
/* XXX:
* does this send a USB_REQ_CLEAR_FEATURE/USB_REQ_SET_FEATURE
* or a SET_REPORT? */
;
}
return -1;
}
static int bt_hid_in(struct bt_hid_device_s *s)
{
s->datain.len = hid_keyboard_poll(&s->hid, s->datain.buffer,
sizeof(s->datain.buffer));
return s->datain.len;
}
static void bt_hid_send_handshake(struct bt_hid_device_s *s, int result)
{
*s->control->sdu_out(s->control, 1) =
(BT_HANDSHAKE << 4) | result;
s->control->sdu_submit(s->control);
}
static void bt_hid_send_control(struct bt_hid_device_s *s, int operation)
{
*s->control->sdu_out(s->control, 1) =
(BT_HID_CONTROL << 4) | operation;
s->control->sdu_submit(s->control);
}
static void bt_hid_disconnect(struct bt_hid_device_s *s)
{
/* Disconnect s->control and s->interrupt */
}
static void bt_hid_send_data(struct bt_l2cap_conn_params_s *ch, int type,
const uint8_t *data, int len)
{
uint8_t *pkt, hdr = (BT_DATA << 4) | type;
int plen;
do {
plen = MIN(len, ch->remote_mtu - 1);
pkt = ch->sdu_out(ch, plen + 1);
pkt[0] = hdr;
if (plen)
memcpy(pkt + 1, data, plen);
ch->sdu_submit(ch);
len -= plen;
data += plen;
hdr = (BT_DATC << 4) | type;
} while (plen == ch->remote_mtu - 1);
}
static void bt_hid_control_transaction(struct bt_hid_device_s *s,
const uint8_t *data, int len)
{
uint8_t type, parameter;
int rlen, ret = -1;
if (len < 1)
return;
type = data[0] >> 4;
parameter = data[0] & 0xf;
switch (type) {
case BT_HANDSHAKE:
case BT_DATA:
switch (parameter) {
default:
/* These are not expected to be sent this direction. */
ret = BT_HS_ERR_INVALID_PARAMETER;
}
break;
case BT_HID_CONTROL:
if (len != 1 || (parameter != BT_HC_VIRTUAL_CABLE_UNPLUG &&
s->state == bt_state_transaction)) {
ret = BT_HS_ERR_INVALID_PARAMETER;
break;
}
switch (parameter) {
case BT_HC_NOP:
break;
case BT_HC_HARD_RESET:
case BT_HC_SOFT_RESET:
bt_hid_reset(s);
break;
case BT_HC_SUSPEND:
if (s->state == bt_state_ready)
s->state = bt_state_suspend;
else
ret = BT_HS_ERR_INVALID_PARAMETER;
break;
case BT_HC_EXIT_SUSPEND:
if (s->state == bt_state_suspend)
s->state = bt_state_ready;
else
ret = BT_HS_ERR_INVALID_PARAMETER;
break;
case BT_HC_VIRTUAL_CABLE_UNPLUG:
bt_hid_disconnect(s);
break;
default:
ret = BT_HS_ERR_INVALID_PARAMETER;
}
break;
case BT_GET_REPORT:
/* No ReportIDs declared. */
if (((parameter & 8) && len != 3) ||
(!(parameter & 8) && len != 1) ||
s->state != bt_state_ready) {
ret = BT_HS_ERR_INVALID_PARAMETER;
break;
}
if (parameter & 8)
rlen = data[2] | (data[3] << 8);
else
rlen = INT_MAX;
switch (parameter & 3) {
case BT_DATA_OTHER:
ret = BT_HS_ERR_INVALID_PARAMETER;
break;
case BT_DATA_INPUT:
/* Here we can as well poll s->usbdev */
bt_hid_send_data(s->control, BT_DATA_INPUT,
s->datain.buffer, MIN(rlen, s->datain.len));
break;
case BT_DATA_OUTPUT:
bt_hid_send_data(s->control, BT_DATA_OUTPUT,
s->dataout.buffer, MIN(rlen, s->dataout.len));
break;
case BT_DATA_FEATURE:
bt_hid_send_data(s->control, BT_DATA_FEATURE,
s->feature.buffer, MIN(rlen, s->feature.len));
break;
}
break;
case BT_SET_REPORT:
if (len < 2 || len > BT_HID_MTU || s->state != bt_state_ready ||
(parameter & 3) == BT_DATA_OTHER ||
(parameter & 3) == BT_DATA_INPUT) {
ret = BT_HS_ERR_INVALID_PARAMETER;
break;
}
s->data_type = parameter & 3;
if (s->data_type == BT_DATA_OUTPUT) {
s->dataout.len = len - 1;
memcpy(s->dataout.buffer, data + 1, s->dataout.len);
} else {
s->feature.len = len - 1;
memcpy(s->feature.buffer, data + 1, s->feature.len);
}
if (len == BT_HID_MTU)
s->state = bt_state_transaction;
else
bt_hid_out(s);
break;
case BT_GET_PROTOCOL:
if (len != 1 || s->state == bt_state_transaction) {
ret = BT_HS_ERR_INVALID_PARAMETER;
break;
}
*s->control->sdu_out(s->control, 1) = s->proto;
s->control->sdu_submit(s->control);
break;
case BT_SET_PROTOCOL:
if (len != 1 || s->state == bt_state_transaction ||
(parameter != BT_HID_PROTO_BOOT &&
parameter != BT_HID_PROTO_REPORT)) {
ret = BT_HS_ERR_INVALID_PARAMETER;
break;
}
s->proto = parameter;
s->hid.protocol = parameter;
ret = BT_HS_SUCCESSFUL;
break;
case BT_GET_IDLE:
if (len != 1 || s->state == bt_state_transaction) {
ret = BT_HS_ERR_INVALID_PARAMETER;
break;
}
*s->control->sdu_out(s->control, 1) = s->hid.idle;
s->control->sdu_submit(s->control);
break;
case BT_SET_IDLE:
if (len != 2 || s->state == bt_state_transaction) {
ret = BT_HS_ERR_INVALID_PARAMETER;
break;
}
s->hid.idle = data[1];
/* XXX: Does this generate a handshake? */
break;
case BT_DATC:
if (len > BT_HID_MTU || s->state != bt_state_transaction) {
ret = BT_HS_ERR_INVALID_PARAMETER;
break;
}
if (s->data_type == BT_DATA_OUTPUT) {
memcpy(s->dataout.buffer + s->dataout.len, data + 1, len - 1);
s->dataout.len += len - 1;
} else {
memcpy(s->feature.buffer + s->feature.len, data + 1, len - 1);
s->feature.len += len - 1;
}
if (len < BT_HID_MTU) {
bt_hid_out(s);
s->state = bt_state_ready;
}
break;
default:
ret = BT_HS_ERR_UNSUPPORTED_REQUEST;
}
if (ret != -1)
bt_hid_send_handshake(s, ret);
}
static void bt_hid_control_sdu(void *opaque, const uint8_t *data, int len)
{
struct bt_hid_device_s *hid = opaque;
bt_hid_control_transaction(hid, data, len);
}
static void bt_hid_datain(HIDState *hs)
{
struct bt_hid_device_s *hid =
container_of(hs, struct bt_hid_device_s, hid);
/* If suspended, wake-up and send a wake-up event first. We might
* want to also inspect the input report and ignore event like
* mouse movements until a button event occurs. */
if (hid->state == bt_state_suspend) {
hid->state = bt_state_ready;
}
if (bt_hid_in(hid) > 0)
/* TODO: when in boot-mode precede any Input reports with the ReportID
* byte, here and in GetReport/SetReport on the Control channel. */
bt_hid_send_data(hid->interrupt, BT_DATA_INPUT,
hid->datain.buffer, hid->datain.len);
}
static void bt_hid_interrupt_sdu(void *opaque, const uint8_t *data, int len)
{
struct bt_hid_device_s *hid = opaque;
if (len > BT_HID_MTU || len < 1)
goto bad;
if ((data[0] & 3) != BT_DATA_OUTPUT)
goto bad;
if ((data[0] >> 4) == BT_DATA) {
if (hid->intr_state)
goto bad;
hid->data_type = BT_DATA_OUTPUT;
hid->intrdataout.len = 0;
} else if ((data[0] >> 4) == BT_DATC) {
if (!hid->intr_state)
goto bad;
} else
goto bad;
memcpy(hid->intrdataout.buffer + hid->intrdataout.len, data + 1, len - 1);
hid->intrdataout.len += len - 1;
hid->intr_state = (len == BT_HID_MTU);
if (!hid->intr_state) {
memcpy(hid->dataout.buffer, hid->intrdataout.buffer,
hid->dataout.len = hid->intrdataout.len);
bt_hid_out(hid);
}
return;
bad:
error_report("%s: bad transaction on Interrupt channel.",
__func__);
}
/* "Virtual cable" plug/unplug event. */
static void bt_hid_connected_update(struct bt_hid_device_s *hid)
{
int prev = hid->connected;
hid->connected = hid->control && hid->interrupt;
/* Stop page-/inquiry-scanning when a host is connected. */
hid->btdev.device.page_scan = !hid->connected;
hid->btdev.device.inquiry_scan = !hid->connected;
if (hid->connected && !prev) {
hid_reset(&hid->hid);
hid->proto = BT_HID_PROTO_REPORT;
}
/* Should set HIDVirtualCable in SDP (possibly need to check that SDP
* isn't destroyed yet, in case we're being called from handle_destroy) */
}
static void bt_hid_close_control(void *opaque)
{
struct bt_hid_device_s *hid = opaque;
hid->control = NULL;
bt_hid_connected_update(hid);
}
static void bt_hid_close_interrupt(void *opaque)
{
struct bt_hid_device_s *hid = opaque;
hid->interrupt = NULL;
bt_hid_connected_update(hid);
}
static int bt_hid_new_control_ch(struct bt_l2cap_device_s *dev,
struct bt_l2cap_conn_params_s *params)
{
struct bt_hid_device_s *hid = (struct bt_hid_device_s *) dev;
if (hid->control)
return 1;
hid->control = params;
hid->control->opaque = hid;
hid->control->close = bt_hid_close_control;
hid->control->sdu_in = bt_hid_control_sdu;
bt_hid_connected_update(hid);
return 0;
}
static int bt_hid_new_interrupt_ch(struct bt_l2cap_device_s *dev,
struct bt_l2cap_conn_params_s *params)
{
struct bt_hid_device_s *hid = (struct bt_hid_device_s *) dev;
if (hid->interrupt)
return 1;
hid->interrupt = params;
hid->interrupt->opaque = hid;
hid->interrupt->close = bt_hid_close_interrupt;
hid->interrupt->sdu_in = bt_hid_interrupt_sdu;
bt_hid_connected_update(hid);
return 0;
}
static void bt_hid_destroy(struct bt_device_s *dev)
{
struct bt_hid_device_s *hid = (struct bt_hid_device_s *) dev;
if (hid->connected)
bt_hid_send_control(hid, BT_HC_VIRTUAL_CABLE_UNPLUG);
bt_l2cap_device_done(&hid->btdev);
hid_free(&hid->hid);
g_free(hid);
}
enum peripheral_minor_class {
class_other = 0 << 4,
class_keyboard = 1 << 4,
class_pointing = 2 << 4,
class_combo = 3 << 4,
};
static struct bt_device_s *bt_hid_init(struct bt_scatternet_s *net,
enum peripheral_minor_class minor)
{
struct bt_hid_device_s *s = g_malloc0(sizeof(*s));
uint32_t class =
/* Format type */
(0 << 0) |
/* Device class */
(minor << 2) |
(5 << 8) | /* "Peripheral" */
/* Service classes */
(1 << 13) | /* Limited discoverable mode */
(1 << 19); /* Capturing device (?) */
bt_l2cap_device_init(&s->btdev, net);
bt_l2cap_sdp_init(&s->btdev);
bt_l2cap_psm_register(&s->btdev, BT_PSM_HID_CTRL,
BT_HID_MTU, bt_hid_new_control_ch);
bt_l2cap_psm_register(&s->btdev, BT_PSM_HID_INTR,
BT_HID_MTU, bt_hid_new_interrupt_ch);
hid_init(&s->hid, HID_KEYBOARD, bt_hid_datain);
s->btdev.device.lmp_name = "BT Keyboard";
s->btdev.device.handle_destroy = bt_hid_destroy;
s->btdev.device.class[0] = (class >> 0) & 0xff;
s->btdev.device.class[1] = (class >> 8) & 0xff;
s->btdev.device.class[2] = (class >> 16) & 0xff;
return &s->btdev.device;
}
struct bt_device_s *bt_keyboard_init(struct bt_scatternet_s *net)
{
return bt_hid_init(net, class_keyboard);
}
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