80 typedef int (*cros_ec_xfer_fn_t) (struct cros_ec_device *ec_dev,
96 	struct cros_ec_device *ec_dev;  member
115 static int terminate_request(struct cros_ec_device *ec_dev)  in terminate_request()  argument
117 	struct cros_ec_spi *ec_spi = ec_dev->priv;  in terminate_request()
136 		dev_err(ec_dev->dev,  in terminate_request()
149 static int receive_n_bytes(struct cros_ec_device *ec_dev, u8 *buf, int n)  in receive_n_bytes()  argument
151 	struct cros_ec_spi *ec_spi = ec_dev->priv;  in receive_n_bytes()
156 	BUG_ON(buf - ec_dev->din + n > ec_dev->din_size);  in receive_n_bytes()
167 		dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret);  in receive_n_bytes()
184 static int cros_ec_spi_receive_packet(struct cros_ec_device *ec_dev,  in cros_ec_spi_receive_packet()  argument
193 	BUG_ON(ec_dev->din_size < EC_MSG_PREAMBLE_COUNT);  in cros_ec_spi_receive_packet()
200 		ret = receive_n_bytes(ec_dev,  in cros_ec_spi_receive_packet()
201 				      ec_dev->din,  in cros_ec_spi_receive_packet()
206 		ptr = ec_dev->din;  in cros_ec_spi_receive_packet()
209 				dev_dbg(ec_dev->dev, "msg found at %zd\n",  in cros_ec_spi_receive_packet()
210 					ptr - ec_dev->din);  in cros_ec_spi_receive_packet()
223 			dev_warn(ec_dev->dev, "EC failed to respond in time\n");  in cros_ec_spi_receive_packet()
233 	BUG_ON(todo < 0 || todo > ec_dev->din_size);  in cros_ec_spi_receive_packet()
235 	memmove(ec_dev->din, ptr, todo);  in cros_ec_spi_receive_packet()
236 	ptr = ec_dev->din + todo;  in cros_ec_spi_receive_packet()
237 	dev_dbg(ec_dev->dev, "need %d, got %d bytes from preamble\n",  in cros_ec_spi_receive_packet()
243 		ret = receive_n_bytes(ec_dev, ptr, sizeof(*response) - todo);  in cros_ec_spi_receive_packet()
250 	response = (struct ec_host_response *)ec_dev->din;  in cros_ec_spi_receive_packet()
253 	if (response->data_len > ec_dev->din_size)  in cros_ec_spi_receive_packet()
265 		dev_dbg(ec_dev->dev, "loop, todo=%d, need_len=%d, ptr=%zd\n",  in cros_ec_spi_receive_packet()
266 			todo, need_len, ptr - ec_dev->din);  in cros_ec_spi_receive_packet()
268 		ret = receive_n_bytes(ec_dev, ptr, todo);  in cros_ec_spi_receive_packet()
276 	dev_dbg(ec_dev->dev, "loop done, ptr=%zd\n", ptr - ec_dev->din);  in cros_ec_spi_receive_packet()
293 static int cros_ec_spi_receive_response(struct cros_ec_device *ec_dev,  in cros_ec_spi_receive_response()  argument
301 	BUG_ON(ec_dev->din_size < EC_MSG_PREAMBLE_COUNT);  in cros_ec_spi_receive_response()
308 		ret = receive_n_bytes(ec_dev,  in cros_ec_spi_receive_response()
309 				      ec_dev->din,  in cros_ec_spi_receive_response()
314 		ptr = ec_dev->din;  in cros_ec_spi_receive_response()
317 				dev_dbg(ec_dev->dev, "msg found at %zd\n",  in cros_ec_spi_receive_response()
318 					ptr - ec_dev->din);  in cros_ec_spi_receive_response()
331 			dev_warn(ec_dev->dev, "EC failed to respond in time\n");  in cros_ec_spi_receive_response()
341 	BUG_ON(todo < 0 || todo > ec_dev->din_size);  in cros_ec_spi_receive_response()
343 	memmove(ec_dev->din, ptr, todo);  in cros_ec_spi_receive_response()
344 	ptr = ec_dev->din + todo;  in cros_ec_spi_receive_response()
345 	dev_dbg(ec_dev->dev, "need %d, got %d bytes from preamble\n",  in cros_ec_spi_receive_response()
358 		dev_dbg(ec_dev->dev, "loop, todo=%d, need_len=%d, ptr=%zd\n",  in cros_ec_spi_receive_response()
359 			todo, need_len, ptr - ec_dev->din);  in cros_ec_spi_receive_response()
361 		ret = receive_n_bytes(ec_dev, ptr, todo);  in cros_ec_spi_receive_response()
365 		debug_packet(ec_dev->dev, "interim", ptr, todo);  in cros_ec_spi_receive_response()
370 	dev_dbg(ec_dev->dev, "loop done, ptr=%zd\n", ptr - ec_dev->din);  in cros_ec_spi_receive_response()
381 static int do_cros_ec_pkt_xfer_spi(struct cros_ec_device *ec_dev,  in do_cros_ec_pkt_xfer_spi()  argument
385 	struct cros_ec_spi *ec_spi = ec_dev->priv;  in do_cros_ec_pkt_xfer_spi()
396 	len = cros_ec_prepare_tx(ec_dev, ec_msg);  in do_cros_ec_pkt_xfer_spi()
397 	dev_dbg(ec_dev->dev, "prepared, len=%d\n", len);  in do_cros_ec_pkt_xfer_spi()
423 	trans.tx_buf = ec_dev->dout;  in do_cros_ec_pkt_xfer_spi()
460 		ret = cros_ec_spi_receive_packet(ec_dev,  in do_cros_ec_pkt_xfer_spi()
463 		dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret);  in do_cros_ec_pkt_xfer_spi()
465 	final_ret = terminate_request(ec_dev);  in do_cros_ec_pkt_xfer_spi()
474 	ptr = ec_dev->din;  in do_cros_ec_pkt_xfer_spi()
480 	ret = cros_ec_check_result(ec_dev, ec_msg);  in do_cros_ec_pkt_xfer_spi()
487 		dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)",  in do_cros_ec_pkt_xfer_spi()
502 		dev_err(ec_dev->dev,  in do_cros_ec_pkt_xfer_spi()
524 static int do_cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,  in do_cros_ec_cmd_xfer_spi()  argument
527 	struct cros_ec_spi *ec_spi = ec_dev->priv;  in do_cros_ec_cmd_xfer_spi()
538 	len = cros_ec_prepare_tx(ec_dev, ec_msg);  in do_cros_ec_cmd_xfer_spi()
539 	dev_dbg(ec_dev->dev, "prepared, len=%d\n", len);  in do_cros_ec_cmd_xfer_spi()
553 	debug_packet(ec_dev->dev, "out", ec_dev->dout, len);  in do_cros_ec_cmd_xfer_spi()
555 	trans.tx_buf = ec_dev->dout;  in do_cros_ec_cmd_xfer_spi()
579 		ret = cros_ec_spi_receive_response(ec_dev,  in do_cros_ec_cmd_xfer_spi()
582 		dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret);  in do_cros_ec_cmd_xfer_spi()
584 	final_ret = terminate_request(ec_dev);  in do_cros_ec_cmd_xfer_spi()
593 	ptr = ec_dev->din;  in do_cros_ec_cmd_xfer_spi()
597 	ret = cros_ec_check_result(ec_dev, ec_msg);  in do_cros_ec_cmd_xfer_spi()
604 		dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)",  in do_cros_ec_cmd_xfer_spi()
618 	debug_packet(ec_dev->dev, "in", ptr, len + 3);  in do_cros_ec_cmd_xfer_spi()
621 		dev_err(ec_dev->dev,  in do_cros_ec_cmd_xfer_spi()
642 	params->ret = params->fn(params->ec_dev, params->ec_msg);  in cros_ec_xfer_high_pri_work()
645 static int cros_ec_xfer_high_pri(struct cros_ec_device *ec_dev,  in cros_ec_xfer_high_pri()  argument
649 	struct cros_ec_spi *ec_spi = ec_dev->priv;  in cros_ec_xfer_high_pri()
653 		.ec_dev = ec_dev,  in cros_ec_xfer_high_pri()
673 static int cros_ec_pkt_xfer_spi(struct cros_ec_device *ec_dev,  in cros_ec_pkt_xfer_spi()  argument
676 	return cros_ec_xfer_high_pri(ec_dev, ec_msg, do_cros_ec_pkt_xfer_spi);  in cros_ec_pkt_xfer_spi()
679 static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,  in cros_ec_cmd_xfer_spi()  argument
682 	return cros_ec_xfer_high_pri(ec_dev, ec_msg, do_cros_ec_cmd_xfer_spi);  in cros_ec_cmd_xfer_spi()
737 	struct cros_ec_device *ec_dev;  in cros_ec_spi_probe()  local
752 	ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);  in cros_ec_spi_probe()
753 	if (!ec_dev)  in cros_ec_spi_probe()
759 	spi_set_drvdata(spi, ec_dev);  in cros_ec_spi_probe()
760 	ec_dev->dev = dev;  in cros_ec_spi_probe()
761 	ec_dev->priv = ec_spi;  in cros_ec_spi_probe()
762 	ec_dev->irq = spi->irq;  in cros_ec_spi_probe()
763 	ec_dev->cmd_xfer = cros_ec_cmd_xfer_spi;  in cros_ec_spi_probe()
764 	ec_dev->pkt_xfer = cros_ec_pkt_xfer_spi;  in cros_ec_spi_probe()
765 	ec_dev->phys_name = dev_name(&ec_spi->spi->dev);  in cros_ec_spi_probe()
766 	ec_dev->din_size = EC_MSG_PREAMBLE_COUNT +  in cros_ec_spi_probe()
769 	ec_dev->dout_size = sizeof(struct ec_host_request);  in cros_ec_spi_probe()
777 	err = cros_ec_register(ec_dev);  in cros_ec_spi_probe()
790 	struct cros_ec_device *ec_dev = spi_get_drvdata(spi);  in cros_ec_spi_remove()  local
792 	return cros_ec_unregister(ec_dev);  in cros_ec_spi_remove()
798 	struct cros_ec_device *ec_dev = dev_get_drvdata(dev);  in cros_ec_spi_suspend()  local
800 	return cros_ec_suspend(ec_dev);  in cros_ec_spi_suspend()
805 	struct cros_ec_device *ec_dev = dev_get_drvdata(dev);  in cros_ec_spi_resume()  local
807 	return cros_ec_resume(ec_dev);  in cros_ec_spi_resume()