1 /*-
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11  * 2. Redistributions in binary form must reproduce the above copyright
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23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
48 static int  tpm20_save_state(device_t dev, bool suspend);
74 	sc = (struct tpm_sc *)dev->si_drv1;  in tpm20_read()
76 	callout_stop(&sc->discard_buffer_callout);  in tpm20_read()
77 	sx_xlock(&sc->dev_lock);  in tpm20_read()
78 	if (sc->owner_tid != uio->uio_td->td_tid) {  in tpm20_read()
79 		sx_xunlock(&sc->dev_lock);  in tpm20_read()
83 	bytes_to_transfer = MIN(sc->pending_data_length, uio->uio_resid);  in tpm20_read()
84 	offset = sc->total_length - sc->pending_data_length;  in tpm20_read()
86 		result = uiomove((caddr_t) sc->buf + offset, bytes_to_transfer, uio);  in tpm20_read()
87 		sc->pending_data_length -= bytes_to_transfer;  in tpm20_read()
88 		cv_signal(&sc->buf_cv);  in tpm20_read()
93 	sx_xunlock(&sc->dev_lock);  in tpm20_read()
105 	sc = (struct tpm_sc *)dev->si_drv1;  in tpm20_write()
107 	byte_count = uio->uio_resid;  in tpm20_write()
109 		device_printf(sc->dev,  in tpm20_write()
115 		device_printf(sc->dev,  in tpm20_write()
120 	sx_xlock(&sc->dev_lock);  in tpm20_write()
122 	while (sc->pending_data_length != 0)  in tpm20_write()
123 		cv_wait(&sc->buf_cv, &sc->dev_lock);  in tpm20_write()
125 	result = uiomove(sc->buf, byte_count, uio);  in tpm20_write()
127 		sx_xunlock(&sc->dev_lock);  in tpm20_write()
131 	result = TPM_TRANSMIT(sc->dev, byte_count);  in tpm20_write()
134 		callout_reset(&sc->discard_buffer_callout,  in tpm20_write()
135 		    TPM_READ_TIMEOUT / tick, tpm20_discard_buffer, sc);  in tpm20_write()
136 		sc->owner_tid = uio->uio_td->td_tid;  in tpm20_write()
139 	sx_xunlock(&sc->dev_lock);  in tpm20_write()
149 	if (callout_pending(&sc->discard_buffer_callout))  in tpm20_discard_buffer()
152 	sx_xlock(&sc->dev_lock);  in tpm20_discard_buffer()
154 	memset(sc->buf, 0, TPM_BUFSIZE);  in tpm20_discard_buffer()
155 	sc->pending_data_length = 0;  in tpm20_discard_buffer()
156 	sc->total_length = 0;  in tpm20_discard_buffer()
158 	cv_signal(&sc->buf_cv);  in tpm20_discard_buffer()
159 	sx_xunlock(&sc->dev_lock);  in tpm20_discard_buffer()
161 	device_printf(sc->dev,  in tpm20_discard_buffer()
162 	    "User failed to read buffer in time\n");  in tpm20_discard_buffer()
193 	cv_init(&sc->buf_cv, "TPM buffer cv");  in tpm20_init()
194 	callout_init(&sc->discard_buffer_callout, 1);  in tpm20_init()
195 	sc->pending_data_length = 0;  in tpm20_init()
196 	sc->total_length = 0;  in tpm20_init()
204 	result = make_dev_s(&args, &sc->sc_cdev, TPM_CDEV_NAME);  in tpm20_init()
210 	TIMEOUT_TASK_INIT(taskqueue_thread, &sc->harvest_task, 0,  in tpm20_init()
212 	taskqueue_enqueue_timeout(taskqueue_thread, &sc->harvest_task, 0);  in tpm20_init()
224 	if (device_is_attached(sc->dev))  in tpm20_release()
225 		taskqueue_drain_timeout(taskqueue_thread, &sc->harvest_task);  in tpm20_release()
229 	if (sc->buf != NULL)  in tpm20_release()
230 		free(sc->buf, M_TPM20);  in tpm20_release()
232 	sx_destroy(&sc->dev_lock);  in tpm20_release()
233 	cv_destroy(&sc->buf_cv);  in tpm20_release()
234 	if (sc->sc_cdev != NULL)  in tpm20_release()
235 		destroy_dev(sc->sc_cdev);  in tpm20_release()
270 	sx_xlock(&sc->dev_lock);  in tpm20_harvest()
271 	while (sc->pending_data_length != 0)  in tpm20_harvest()
272 		cv_wait(&sc->buf_cv, &sc->dev_lock);  in tpm20_harvest()
274 	memcpy(sc->buf, cmd, sizeof(cmd));  in tpm20_harvest()
275 	result = TPM_TRANSMIT(sc->dev, sizeof(cmd));  in tpm20_harvest()
277 		sx_xunlock(&sc->dev_lock);  in tpm20_harvest()
282 	sc->pending_data_length = 0;  in tpm20_harvest()
283 	sc->total_length = 0;  in tpm20_harvest()
286 	entropy_size = (uint16_t) sc->buf[TPM_HEADER_SIZE + 1];  in tpm20_harvest()
290 			sc->buf + TPM_HEADER_SIZE + sizeof(uint16_t),  in tpm20_harvest()
294 	sx_xunlock(&sc->dev_lock);  in tpm20_harvest()
298 	taskqueue_enqueue_timeout(taskqueue_thread, &sc->harvest_task,  in tpm20_harvest()
304 tpm20_save_state(device_t dev, bool suspend)  in tpm20_save_state()  argument
317 	 * Inform the TPM whether we are going to suspend or reboot/shutdown.  in tpm20_save_state()
319 	if (suspend)  in tpm20_save_state()
322 	if (sc == NULL || sc->buf == NULL)  in tpm20_save_state()
325 	sx_xlock(&sc->dev_lock);  in tpm20_save_state()
327 	memcpy(sc->buf, save_cmd, sizeof(save_cmd));  in tpm20_save_state()
328 	TPM_TRANSMIT(sc->dev, sizeof(save_cmd));  in tpm20_save_state()
330 	sx_xunlock(&sc->dev_lock);  in tpm20_save_state()