1 // SPDX-License-Identifier: GPL-2.0-or-later
92 #define ST_SPUA				0x01  /* Strong Pull-up is active */
101 /* 1-wire data i/o fifo size, 128 bytes */
174 	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),  in ds_send_control_cmd()
177 		dev_err(&dev->udev->dev,  in ds_send_control_cmd()
190 	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),  in ds_send_control_mode()
193 		dev_err(&dev->udev->dev,  in ds_send_control_mode()
206 	err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),  in ds_send_control()
209 		dev_err(&dev->udev->dev,  in ds_send_control()
220 	struct device *dev = &ds_dev->udev->dev;  in ds_dump_status()
224 		ds_dev->ep[EP_STATUS], count, count, buf);  in ds_dump_status()
228 		dev_dbg(dev, "1-wire speed: 0x%02x", buf[1]);  in ds_dump_status()
231 		dev_dbg(dev, "pulldown slew rate control: 0x%02x", buf[4]);  in ds_dump_status()
232 		dev_dbg(dev, "write-1 low time: 0x%02x", buf[5]);  in ds_dump_status()
233 		dev_dbg(dev, "data sample offset/write-0 recovery time: 0x%02x", buf[6]);  in ds_dump_status()
239 		dev_dbg(dev, "1-wire data output buffer status: 0x%02x", buf[12]);  in ds_dump_status()
240 		dev_dbg(dev, "1-wire data input buffer status: 0x%02x", buf[13]);  in ds_dump_status()
278 	err = usb_interrupt_msg(dev->udev,  in ds_recv_status()
279 				usb_rcvintpipe(dev->udev,  in ds_recv_status()
280 					       dev->ep[EP_STATUS]),  in ds_recv_status()
281 				dev->st_buf, sizeof(dev->st_buf),  in ds_recv_status()
284 		dev_err(&dev->udev->dev,  in ds_recv_status()
285 			"Failed to read 1-wire data from 0x%x: err=%d.\n",  in ds_recv_status()
286 			dev->ep[EP_STATUS], err);  in ds_recv_status()
291 		memcpy(st, dev->st_buf, sizeof(*st));  in ds_recv_status()
303 		dev_err(&dev->udev->dev,  in ds_reset_device()
305 	/* Chip strong pullup time was cleared. */  in ds_reset_device()
306 	if (dev->spu_sleep) {  in ds_reset_device()
308 		u8 del = dev->spu_sleep>>4;  in ds_reset_device()
311 			dev_err(&dev->udev->dev,  in ds_reset_device()
330 	err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),  in ds_recv_data()
335 		dev_info(&dev->udev->dev, "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);  in ds_recv_data()
336 		usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));  in ds_recv_data()
338 		/* status might tell us why endpoint is stuck? */  in ds_recv_data()
341 			ds_dump_status(dev, dev->st_buf, recv_len);  in ds_recv_data()
364 …err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, …  in ds_send_data()
366 		dev_err(&dev->udev->dev, "Failed to write 1-wire data to ep0x%x: "  in ds_send_data()
367 			"err=%d.\n", dev->ep[EP_DATA_OUT], err);  in ds_send_data()
434 		st->status = 0;  in ds_wait_status()
439 			printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);  in ds_wait_status()
441 				printk("%02x ", dev->st_buf[i]);  in ds_wait_status()
445 	} while (!(st->status & ST_IDLE) && !(err < 0) && ++count < 100);  in ds_wait_status()
447 	if (err >= 16 && st->status & ST_EPOF) {  in ds_wait_status()
448 		dev_info(&dev->udev->dev, "Resetting device after ST_EPOF.\n");  in ds_wait_status()
459 		ds_dump_status(dev, dev->st_buf, err);  in ds_wait_status()
466 		return -1;  in ds_wait_status()
497 		return -EINVAL;
520 	dev->spu_bit = delay ? COMM_SPU : 0;  in ds_set_pullup()
521 	/* If delay is zero, it has already been disabled, if the time is  in ds_set_pullup()
526 	if (delay == 0 || ms == dev->spu_sleep)  in ds_set_pullup()
533 	dev->spu_sleep = ms;  in ds_set_pullup()
564 	 * produce one time slot, a down followed by an up with COMM_D
583 	err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | dev->spu_bit, byte);  in ds_write_byte()
587 	if (dev->spu_bit)  in ds_write_byte()
588 		msleep(dev->spu_sleep);  in ds_write_byte()
594 	err = ds_recv_data(dev, &dev->byte_buf, 1);  in ds_write_byte()
598 	return !(byte == dev->byte_buf);  in ds_write_byte()
647 		return -E2BIG;  in ds_read_block()
651 		err = read_block_chunk(dev, &buf[len - rem], to_read);  in ds_read_block()
654 		rem -= to_read;  in ds_read_block()
669 	err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | dev->spu_bit, len);  in ds_write_block()
673 	if (dev->spu_bit)  in ds_write_block()
674 		msleep(dev->spu_sleep);  in ds_write_block()
693 	 * more, search_limit IDs will be returned followed by a non-zero  in ds9490r_search()
705 	 * discovering 8 devices (1 bulk transfer and 1/2 FIFO size) at a time.  in ds9490r_search()
722 	found_ids = kmalloc_array(master->max_slave_count, sizeof(u64), GFP_KERNEL);  in ds9490r_search()
728 	mutex_lock(&master->bus_mutex);  in ds9490r_search()
731 	if (ds_send_data(dev, (u8 *)&master->search_id, 8) < 0)  in ds9490r_search()
733 	master->search_id = 0;  in ds9490r_search()
737 	search_limit = master->max_slave_count;  in ds9490r_search()
770 					master->search_id = buf[i];  in ds9490r_search()
776 		if (test_bit(W1_ABORT_SEARCH, &master->flags))  in ds9490r_search()
782 		master->search_id = 0;  in ds9490r_search()
783 	} else if (!test_bit(W1_WARN_MAX_COUNT, &master->flags)) {  in ds9490r_search()
792 		dev_info(&dev->udev->dev, "%s: max_slave_count %d reached, "  in ds9490r_search()
794 			master->max_slave_count);  in ds9490r_search()
795 		set_bit(W1_WARN_MAX_COUNT, &master->flags);  in ds9490r_search()
799 	mutex_unlock(&master->bus_mutex);  in ds9490r_search()
862 	if (ds_touch_bit(dev, bit, &dev->byte_buf))  in ds9490r_touch_bit()
865 	return dev->byte_buf;  in ds9490r_touch_bit()
881 	err = ds_touch_bit(dev, 1, &dev->byte_buf);
885 	return dev->byte_buf & 1;
901 	err = ds_read_byte(dev, &dev->byte_buf);  in ds9490r_read_byte()
905 	return dev->byte_buf;  in ds9490r_read_byte()
971 	memset(&dev->master, 0, sizeof(struct w1_bus_master));  in ds_w1_init()
985 	dev->master.data	= dev;  in ds_w1_init()
986 	dev->master.touch_bit	= &ds9490r_touch_bit;  in ds_w1_init()
990 	 * individual time slot at the lowest level.  The requirement from  in ds_w1_init()
991 	 * pulling the bus state down to reading the state is 15us, something  in ds_w1_init()
993 	dev->master.read_bit	= &ds9490r_read_bit;  in ds_w1_init()
994 	dev->master.write_bit	= &ds9490r_write_bit;  in ds_w1_init()
996 	dev->master.read_byte	= &ds9490r_read_byte;  in ds_w1_init()
997 	dev->master.write_byte	= &ds9490r_write_byte;  in ds_w1_init()
998 	dev->master.read_block	= &ds9490r_read_block;  in ds_w1_init()
999 	dev->master.write_block	= &ds9490r_write_block;  in ds_w1_init()
1000 	dev->master.reset_bus	= &ds9490r_reset;  in ds_w1_init()
1001 	dev->master.set_pullup	= &ds9490r_set_pullup;  in ds_w1_init()
1002 	dev->master.search	= &ds9490r_search;  in ds_w1_init()
1004 	return w1_add_master_device(&dev->master);  in ds_w1_init()
1009 	w1_remove_master_device(&dev->master);  in ds_w1_fini()
1023 		return -ENOMEM;  in ds_probe()
1025 	dev->udev = usb_get_dev(udev);  in ds_probe()
1026 	if (!dev->udev) {  in ds_probe()
1027 		err = -ENOMEM;  in ds_probe()
1030 	memset(dev->ep, 0, sizeof(dev->ep));  in ds_probe()
1034 	err = usb_reset_configuration(dev->udev);  in ds_probe()
1036 		dev_err(&dev->udev->dev,  in ds_probe()
1043 	err = usb_set_interface(dev->udev,  in ds_probe()
1044 		intf->cur_altsetting->desc.bInterfaceNumber, alt);  in ds_probe()
1046 		dev_err(&dev->udev->dev, "Failed to set alternative setting %d "  in ds_probe()
1048 			intf->cur_altsetting->desc.bInterfaceNumber, err);  in ds_probe()
1052 	iface_desc = intf->cur_altsetting;  in ds_probe()
1053 	if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {  in ds_probe()
1054 		dev_err(&dev->udev->dev, "Num endpoints=%d. It is not DS9490R.\n",  in ds_probe()
1055 			iface_desc->desc.bNumEndpoints);  in ds_probe()
1056 		err = -EINVAL;  in ds_probe()
1062 	 * so we will fill only 1-3 endpoints entry.  in ds_probe()
1064 	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {  in ds_probe()
1065 		endpoint = &iface_desc->endpoint[i].desc;  in ds_probe()
1067 		dev->ep[i+1] = endpoint->bEndpointAddress;  in ds_probe()
1070 			i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),  in ds_probe()
1071 			(endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",  in ds_probe()
1072 			endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);  in ds_probe()
1081 	list_add_tail(&dev->ds_entry, &ds_devices);  in ds_probe()
1088 	usb_put_dev(dev->udev);  in ds_probe()
1103 	list_del(&dev->ds_entry);  in ds_disconnect()
1110 	usb_put_dev(dev->udev);  in ds_disconnect()
1129 MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)");