bta_hh_co.c revision ead3cde4bac0c3e32cd31f149093f004eef8ceeb 
1/******************************************************************************
2 *
3 *  Copyright (C) 2009-2012 Broadcom Corporation
4 *
5 *  Licensed under the Apache License, Version 2.0 (the "License");
6 *  you may not use this file except in compliance with the License.
7 *  You may obtain a copy of the License at:
8 *
9 *  http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 *
17 ******************************************************************************/
18
19//#if (defined(BTA_HH_INCLUDED) && (BTA_HH_INCLUDED == TRUE))
20
21#include <ctype.h>
22#include <fcntl.h>
23#include <sys/poll.h>
24#include <pthread.h>
25#include <stdio.h>
26#include <string.h>
27#include <stdint.h>
28#include <errno.h>
29#include <linux/uhid.h>
30#include "btif_hh.h"
31#include "bta_api.h"
32#include "bta_hh_api.h"
33
34
35
36const char *dev_path = "/dev/uhid";
37
38
39/*Internal function to perform UHID write and error checking*/
40static int uhid_write(int fd, const struct uhid_event *ev)
41{
42    ssize_t ret;
43    ret = write(fd, ev, sizeof(*ev));
44    if (ret < 0){
45        int rtn = -errno;
46        APPL_TRACE_ERROR2("%s: Cannot write to uhid:%s", __FUNCTION__, strerror(errno));
47        return rtn;
48    } else if (ret != sizeof(*ev)) {
49        APPL_TRACE_ERROR3("%s: Wrong size written to uhid: %ld != %lu",
50                                                    __FUNCTION__, ret, sizeof(*ev));
51        return -EFAULT;
52    } else {
53        return 0;
54    }
55}
56
57/* Internal function to parse the events received from UHID driver*/
58static int uhid_event(btif_hh_device_t *p_dev)
59{
60    struct uhid_event ev;
61    ssize_t ret;
62    memset(&ev, 0, sizeof(ev));
63    if(!p_dev)
64    {
65        APPL_TRACE_ERROR1("%s: Device not found",__FUNCTION__)
66        return -1;
67    }
68    ret = read(p_dev->fd, &ev, sizeof(ev));
69    if (ret == 0) {
70        APPL_TRACE_ERROR2("%s: Read HUP on uhid-cdev %s", __FUNCTION__,
71                                                 strerror(errno));
72        return -EFAULT;
73    } else if (ret < 0) {
74        APPL_TRACE_ERROR2("%s:Cannot read uhid-cdev: %s", __FUNCTION__,
75                                                strerror(errno));
76        return -errno;
77    } else if (ret != sizeof(ev)) {
78        APPL_TRACE_ERROR3("%s:Invalid size read from uhid-dev: %ld != %lu",
79                            __FUNCTION__, ret, sizeof(ev));
80        return -EFAULT;
81    }
82
83    switch (ev.type) {
84    case UHID_START:
85        APPL_TRACE_DEBUG0("UHID_START from uhid-dev\n");
86        break;
87    case UHID_STOP:
88        APPL_TRACE_DEBUG0("UHID_STOP from uhid-dev\n");
89        break;
90    case UHID_OPEN:
91        APPL_TRACE_DEBUG0("UHID_OPEN from uhid-dev\n");
92        break;
93    case UHID_CLOSE:
94        APPL_TRACE_DEBUG0("UHID_CLOSE from uhid-dev\n");
95        break;
96    case UHID_OUTPUT:
97        APPL_TRACE_DEBUG2("UHID_OUTPUT: Report type = %d, report_size = %d"
98                            ,ev.u.output.rtype, ev.u.output.size);
99        //Send SET_REPORT with feature report if the report type in output event is FEATURE
100        if(ev.u.output.rtype == UHID_FEATURE_REPORT)
101            btif_hh_setreport(p_dev,BTHH_FEATURE_REPORT,ev.u.output.size,ev.u.output.data);
102        else if(ev.u.output.rtype == UHID_OUTPUT_REPORT)
103            btif_hh_setreport(p_dev,BTHH_OUTPUT_REPORT,ev.u.output.size,ev.u.output.data);
104        else
105            btif_hh_setreport(p_dev,BTHH_INPUT_REPORT,ev.u.output.size,ev.u.output.data);
106           break;
107    case UHID_OUTPUT_EV:
108        APPL_TRACE_DEBUG0("UHID_OUTPUT_EV from uhid-dev\n");
109        break;
110    case UHID_FEATURE:
111        APPL_TRACE_DEBUG0("UHID_FEATURE from uhid-dev\n");
112        break;
113    case UHID_FEATURE_ANSWER:
114        APPL_TRACE_DEBUG0("UHID_FEATURE_ANSWER from uhid-dev\n");
115        break;
116
117    default:
118        APPL_TRACE_DEBUG1("Invalid event from uhid-dev: %u\n", ev.type);
119    }
120
121    return 0;
122}
123
124/*******************************************************************************
125**
126** Function create_thread
127**
128** Description creat a select loop
129**
130** Returns pthread_t
131**
132*******************************************************************************/
133static inline pthread_t create_thread(void *(*start_routine)(void *), void * arg){
134    APPL_TRACE_DEBUG0("create_thread: entered");
135    pthread_attr_t thread_attr;
136
137    pthread_attr_init(&thread_attr);
138    pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_JOINABLE);
139    pthread_t thread_id = -1;
140    if ( pthread_create(&thread_id, &thread_attr, start_routine, arg)!=0 )
141    {
142        APPL_TRACE_ERROR1("pthread_create : %s", strerror(errno));
143        return -1;
144    }
145    APPL_TRACE_DEBUG0("create_thread: thread created successfully");
146    return thread_id;
147}
148
149/*******************************************************************************
150**
151** Function btif_hh_poll_event_thread
152**
153** Description the polling thread which polls for event from UHID driver
154**
155** Returns void
156**
157*******************************************************************************/
158static void *btif_hh_poll_event_thread(void *arg)
159{
160
161    btif_hh_device_t *p_dev = arg;
162    APPL_TRACE_DEBUG2("%s: Thread created fd = %d", __FUNCTION__, p_dev->fd);
163    struct pollfd pfds[1];
164    int ret;
165    pfds[0].fd = p_dev->fd;
166    pfds[0].events = POLLIN;
167
168    while(p_dev->hh_keep_polling){
169        ret = poll(pfds, 1, 500);
170        if (ret < 0) {
171            APPL_TRACE_ERROR2("%s: Cannot poll for fds: %s\n", __FUNCTION__, strerror(errno));
172            break;
173        }
174        if (pfds[0].revents & POLLIN) {
175            APPL_TRACE_DEBUG0("btif_hh_poll_event_thread: POLLIN");
176            ret = uhid_event(p_dev);
177            if (ret){
178                break;
179            }
180        }
181    }
182
183    p_dev->hh_poll_thread_id = -1;
184    return 0;
185}
186
187static inline void btif_hh_close_poll_thread(btif_hh_device_t *p_dev)
188{
189    APPL_TRACE_DEBUG1("%s", __FUNCTION__);
190    p_dev->hh_keep_polling = 0;
191    if(p_dev->hh_poll_thread_id > 0)
192        pthread_join(p_dev->hh_poll_thread_id,NULL);
193
194    return;
195}
196
197void bta_hh_co_destroy(int fd)
198{
199    struct uhid_event ev;
200    memset(&ev, 0, sizeof(ev));
201    ev.type = UHID_DESTROY;
202    uhid_write(fd, &ev);
203    close(fd);
204}
205
206int bta_hh_co_write(int fd, UINT8* rpt, UINT16 len)
207{
208    APPL_TRACE_DEBUG0("bta_hh_co_data: UHID write");
209    struct uhid_event ev;
210    memset(&ev, 0, sizeof(ev));
211    ev.type = UHID_INPUT;
212    ev.u.input.size = len;
213    if(len > sizeof(ev.u.input.data)){
214        APPL_TRACE_WARNING1("%s:report size greater than allowed size",__FUNCTION__);
215        return -1;
216    }
217    memcpy(ev.u.input.data, rpt, len);
218    return uhid_write(fd, &ev);
219
220}
221
222
223/*******************************************************************************
224**
225** Function      bta_hh_co_open
226**
227** Description   When connection is opened, this call-out function is executed
228**               by HH to do platform specific initialization.
229**
230** Returns       void.
231*******************************************************************************/
232void bta_hh_co_open(UINT8 dev_handle, UINT8 sub_class, tBTA_HH_ATTR_MASK attr_mask,
233                    UINT8 app_id)
234{
235    UINT32 i;
236    btif_hh_device_t *p_dev = NULL;
237
238    if (dev_handle == BTA_HH_INVALID_HANDLE) {
239        APPL_TRACE_WARNING2("%s: Oops, dev_handle (%d) is invalid...", __FUNCTION__, dev_handle);
240        return;
241    }
242
243    for (i = 0; i < BTIF_HH_MAX_HID; i++) {
244        p_dev = &btif_hh_cb.devices[i];
245        if (p_dev->dev_status != BTHH_CONN_STATE_UNKNOWN && p_dev->dev_handle == dev_handle) {
246            // We found a device with the same handle. Must be a device reconnected.
247            APPL_TRACE_WARNING2("%s: Found an existing device with the same handle "
248                                                                "dev_status = %d",__FUNCTION__,
249                                                                p_dev->dev_status);
250            APPL_TRACE_WARNING6("%s:     bd_addr = [%02X:%02X:%02X:%02X:%02X:]", __FUNCTION__,
251                 p_dev->bd_addr.address[0], p_dev->bd_addr.address[1], p_dev->bd_addr.address[2],
252                 p_dev->bd_addr.address[3], p_dev->bd_addr.address[4]);
253                 APPL_TRACE_WARNING4("%s:     attr_mask = 0x%04x, sub_class = 0x%02x, app_id = %d",
254                                  __FUNCTION__, p_dev->attr_mask, p_dev->sub_class, p_dev->app_id);
255
256            if(p_dev->fd<0) {
257                p_dev->fd = open(dev_path, O_RDWR | O_CLOEXEC);
258                if (p_dev->fd < 0){
259                    APPL_TRACE_ERROR2("%s: Error: failed to open uhid, err:%s",
260                                                                    __FUNCTION__,strerror(errno));
261                }else
262                    APPL_TRACE_DEBUG2("%s: uhid fd = %d", __FUNCTION__, p_dev->fd);
263            }
264            p_dev->hh_keep_polling = 1;
265            p_dev->hh_poll_thread_id = create_thread(btif_hh_poll_event_thread, p_dev);
266            break;
267        }
268        p_dev = NULL;
269    }
270
271    if (p_dev == NULL) {
272        // Did not find a device reconnection case. Find an empty slot now.
273        for (i = 0; i < BTIF_HH_MAX_HID; i++) {
274            if (btif_hh_cb.devices[i].dev_status == BTHH_CONN_STATE_UNKNOWN) {
275                p_dev = &btif_hh_cb.devices[i];
276                p_dev->dev_handle = dev_handle;
277                p_dev->attr_mask  = attr_mask;
278                p_dev->sub_class  = sub_class;
279                p_dev->app_id     = app_id;
280
281                btif_hh_cb.device_num++;
282                // This is a new device,open the uhid driver now.
283                p_dev->fd = open(dev_path, O_RDWR | O_CLOEXEC);
284                if (p_dev->fd < 0){
285                    APPL_TRACE_ERROR2("%s: Error: failed to open uhid, err:%s",
286                                                                    __FUNCTION__,strerror(errno));
287                }else{
288                    APPL_TRACE_DEBUG2("%s: uhid fd = %d", __FUNCTION__, p_dev->fd);
289                    p_dev->hh_keep_polling = 1;
290                    p_dev->hh_poll_thread_id = create_thread(btif_hh_poll_event_thread, p_dev);
291                }
292
293
294                break;
295            }
296        }
297    }
298
299    if (p_dev == NULL) {
300        APPL_TRACE_ERROR1("%s: Error: too many HID devices are connected", __FUNCTION__);
301        return;
302    }
303
304    p_dev->dev_status = BTHH_CONN_STATE_CONNECTED;
305    APPL_TRACE_DEBUG2("%s: Return device status %d", __FUNCTION__, p_dev->dev_status);
306}
307
308
309/*******************************************************************************
310**
311** Function      bta_hh_co_close
312**
313** Description   When connection is closed, this call-out function is executed
314**               by HH to do platform specific finalization.
315**
316** Parameters    dev_handle  - device handle
317**                  app_id      - application id
318**
319** Returns          void.
320*******************************************************************************/
321void bta_hh_co_close(UINT8 dev_handle, UINT8 app_id)
322{
323    UINT32 i;
324    btif_hh_device_t *p_dev = NULL;
325
326    APPL_TRACE_WARNING3("%s: dev_handle = %d, app_id = %d", __FUNCTION__, dev_handle, app_id);
327    if (dev_handle == BTA_HH_INVALID_HANDLE) {
328        APPL_TRACE_WARNING2("%s: Oops, dev_handle (%d) is invalid...", __FUNCTION__, dev_handle);
329        return;
330    }
331
332    for (i = 0; i < BTIF_HH_MAX_HID; i++) {
333        p_dev = &btif_hh_cb.devices[i];
334        if (p_dev->dev_status != BTHH_CONN_STATE_UNKNOWN && p_dev->dev_handle == dev_handle) {
335            APPL_TRACE_WARNING3("%s: Found an existing device with the same handle "
336                                                        "dev_status = %d, dev_handle =%d"
337                                                        ,__FUNCTION__,p_dev->dev_status
338                                                        ,p_dev->dev_handle);
339            btif_hh_close_poll_thread(p_dev);
340            break;
341        }
342     }
343
344}
345
346
347/*******************************************************************************
348**
349** Function         bta_hh_co_data
350**
351** Description      This function is executed by BTA when HID host receive a data
352**                  report.
353**
354** Parameters       dev_handle  - device handle
355**                  *p_rpt      - pointer to the report data
356**                  len         - length of report data
357**                  mode        - Hid host Protocol Mode
358**                  sub_clas    - Device Subclass
359**                  app_id      - application id
360**
361** Returns          void
362*******************************************************************************/
363void bta_hh_co_data(UINT8 dev_handle, UINT8 *p_rpt, UINT16 len, tBTA_HH_PROTO_MODE mode,
364                    UINT8 sub_class, UINT8 ctry_code, BD_ADDR peer_addr, UINT8 app_id)
365{
366    btif_hh_device_t *p_dev;
367
368    APPL_TRACE_DEBUG6("%s: dev_handle = %d, subclass = 0x%02X, mode = %d, "
369         "ctry_code = %d, app_id = %d",
370         __FUNCTION__, dev_handle, sub_class, mode, ctry_code, app_id);
371
372    p_dev = btif_hh_find_connected_dev_by_handle(dev_handle);
373    if (p_dev == NULL) {
374        APPL_TRACE_WARNING2("%s: Error: unknown HID device handle %d", __FUNCTION__, dev_handle);
375        return;
376    }
377    // Send the HID report to the kernel.
378    if (p_dev->fd >= 0) {
379        bta_hh_co_write(p_dev->fd, p_rpt, len);
380    }else {
381        APPL_TRACE_WARNING3("%s: Error: fd = %d, len = %d", __FUNCTION__, p_dev->fd, len);
382    }
383}
384
385
386/*******************************************************************************
387**
388** Function         bta_hh_co_send_hid_info
389**
390** Description      This function is called in btif_hh.c to process DSCP received.
391**
392** Parameters       dev_handle  - device handle
393**                  dscp_len    - report descriptor length
394**                  *p_dscp     - report descriptor
395**
396** Returns          void
397*******************************************************************************/
398void bta_hh_co_send_hid_info(btif_hh_device_t *p_dev, char *dev_name, UINT16 vendor_id,
399                             UINT16 product_id, UINT16 version, UINT8 ctry_code,
400                             int dscp_len, UINT8 *p_dscp)
401{
402    int result;
403    struct uhid_event ev;
404
405    if (p_dev->fd < 0) {
406        APPL_TRACE_WARNING3("%s: Error: fd = %d, dscp_len = %d", __FUNCTION__, p_dev->fd, dscp_len);
407        return;
408    }
409
410    APPL_TRACE_WARNING4("%s: fd = %d, name = [%s], dscp_len = %d", __FUNCTION__,
411                                                                    p_dev->fd, dev_name, dscp_len);
412    APPL_TRACE_WARNING5("%s: vendor_id = 0x%04x, product_id = 0x%04x, version= 0x%04x,"
413                                                                    "ctry_code=0x%02x",__FUNCTION__,
414                                                                    vendor_id, product_id,
415                                                                    version, ctry_code);
416
417//Create and send hid descriptor to kernel
418    memset(&ev, 0, sizeof(ev));
419    ev.type = UHID_CREATE;
420    strncpy((char*)ev.u.create.name, dev_name, sizeof(ev.u.create.name) - 1);
421    ev.u.create.rd_size = dscp_len;
422    ev.u.create.rd_data = p_dscp;
423    ev.u.create.bus = BUS_BLUETOOTH;
424    ev.u.create.vendor = vendor_id;
425    ev.u.create.product = product_id;
426    ev.u.create.version = version;
427    ev.u.create.country = ctry_code;
428    result = uhid_write(p_dev->fd, &ev);
429
430    APPL_TRACE_WARNING4("%s: fd = %d, dscp_len = %d, result = %d", __FUNCTION__,
431                                                                    p_dev->fd, dscp_len, result);
432
433    if (result) {
434        APPL_TRACE_WARNING2("%s: Error: failed to send DSCP, result = %d", __FUNCTION__, result);
435
436        /* The HID report descriptor is corrupted. Close the driver. */
437        close(p_dev->fd);
438        p_dev->fd = -1;
439    }
440}
441
442
443