int demo_read_rt(struct rtdm_dev_context *context, rtdm_user_info_t *user_info, void *buf, size_t nbyte) { struct demodrv_context *ctx; int dev_id; // rtdm_lockctx_t lock_ctx; char *out_pos = (char *)buf; rtdm_toseq_t timeout_seq; int ret; // zero bytes requested ? return! if (nbyte == 0) return 0; // check if R/W actions to user-space are allowed if (user_info && !rtdm_rw_user_ok(user_info, buf, nbyte)) return -EFAULT; ctx = (struct demodrv_context *)context->dev_private; dev_id = ctx->dev_id; // in case we need to check if reading is allowed (locking) /* if (test_and_set_bit(0, &ctx->in_lock)) return -EBUSY; */ /* // if we need to do some stuff with preemption disabled: rtdm_lock_get_irqsave(&ctx->lock, lock_ctx); // stuff here rtdm_lock_put_irqrestore(&ctx->lock, lock_ctx); */ // wait: if ctx->timeout = 0, it will block infintely until // rtdm_event_signal(&ctx->irq_event); is called from our // interrupt routine ret = rtdm_event_timedwait(&ctx->irq_event, ctx->timeout, &timeout_seq); // now write the requested stuff to user-space if (rtdm_copy_to_user(user_info, out_pos, dummy_buffer, BUFSIZE) != 0) { ret = -EFAULT; } else { ret = BUFSIZE; } return ret; }
static int rtdmtest_ioctl(struct rtdm_dev_context *context, rtdm_user_info_t *user_info, unsigned int request, void *arg) { struct rtdmtest_context *ctx; struct rttst_rtdmtest_config config_buf, *config; rtdm_toseq_t toseq_local, *toseq = NULL; int i, err = 0; ctx = (struct rtdmtest_context *)context->dev_private; switch (request) { case RTTST_RTIOC_RTDMTEST_SEM_TIMEDDOWN: case RTTST_RTIOC_RTDMTEST_EVENT_TIMEDWAIT: case RTTST_RTIOC_RTDMTEST_MUTEX_TIMEDTEST: case RTTST_RTIOC_RTDMTEST_MUTEX_TEST: config = arg; if (user_info) { if (rtdm_safe_copy_from_user (user_info, &config_buf, arg, sizeof(struct rttst_rtdmtest_config)) < 0) return -EFAULT; config = &config_buf; } if (!config->seqcount) config->seqcount = 1; if (config->timeout && config->seqcount > 1) { toseq = &toseq_local; rtdm_toseq_init(toseq, config->timeout); } switch(request) { case RTTST_RTIOC_RTDMTEST_SEM_TIMEDDOWN: for (i = 0; i < config->seqcount; i++) { err = rtdm_sem_timeddown(&ctx->sem, config->timeout, toseq); if (err) break; } break; case RTTST_RTIOC_RTDMTEST_EVENT_TIMEDWAIT: for (i = 0; i < config->seqcount; i++) { err = rtdm_event_timedwait(&ctx->event, config->timeout, toseq); if (err) break; } break; case RTTST_RTIOC_RTDMTEST_MUTEX_TIMEDTEST: for (i = 0; i < config->seqcount; i++) { err = rtdm_mutex_timedlock(&ctx->mutex, config->timeout, toseq); if (err) break; if (config->delay_jiffies) { __set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(config->delay_jiffies); } rtdm_lock_count++; rtdm_mutex_unlock(&ctx->mutex); } break; case RTTST_RTIOC_RTDMTEST_MUTEX_TEST: for (i = 0; i < config->seqcount; i++) { if ((err = rtdm_mutex_lock(&ctx->mutex))) break; rtdm_lock_count++; rtdm_mutex_unlock(&ctx->mutex); } break; } break; case RTTST_RTIOC_RTDMTEST_SEM_DOWN: err = rtdm_sem_down(&ctx->sem); break; case RTTST_RTIOC_RTDMTEST_SEM_UP: rtdm_sem_up(&ctx->sem); break; case RTTST_RTIOC_RTDMTEST_SEM_DESTROY: rtdm_sem_destroy(&ctx->sem); break; case RTTST_RTIOC_RTDMTEST_EVENT_WAIT: err = rtdm_event_wait(&ctx->event); break; case RTTST_RTIOC_RTDMTEST_EVENT_SIGNAL: rtdm_event_signal(&ctx->event); break; case RTTST_RTIOC_RTDMTEST_EVENT_DESTROY: rtdm_event_destroy(&ctx->event); break; case RTTST_RTIOC_RTDMTEST_MUTEX_DESTROY: rtdm_mutex_destroy(&ctx->mutex); break; case RTTST_RTIOC_RTDMTEST_MUTEX_GETSTAT: printk("RTTST_RTIOC_RTDMTEST_MUTEX_GETSTAT\n"); if (user_info) config = &config_buf; else config = arg; config->seqcount = rtdm_lock_count; if (user_info) { if (rtdm_safe_copy_to_user (user_info, arg, &config_buf, sizeof(struct rttst_rtdmtest_config)) < 0) return -EFAULT; } break; case RTTST_RTIOC_RTDMTEST_NRTSIG_PEND: rtdm_nrtsig_pend(&ctx->nrtsig); break; case RTTST_RTIOC_RTDMTEST_TASK_CREATE: case RTTST_RTIOC_RTDMTEST_TASK_SET_PRIO: config = arg; if (user_info) { if (rtdm_safe_copy_from_user (user_info, &config_buf, arg, sizeof(struct rttst_rtdmtest_config)) < 0) return -EFAULT; config = &config_buf; } if (request == RTTST_RTIOC_RTDMTEST_TASK_CREATE) { task_period = config->timeout; rtdm_task_init(&task, "RTDMTEST", rtdmtest_task, (void *)config, config->priority, 0); } else { rtdm_task_set_priority(&task, config->priority); } break; case RTTST_RTIOC_RTDMTEST_TASK_DESTROY: rtdm_task_destroy(&task); rtdm_task_join_nrt(&task, 100); break; default: printk("request=%d\n", request); err = -ENOTTY; } return err; }