1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (c) 2008-2009 Rodolfo Giometti <[email protected]>
6  * Copyright (c) 2008-2009 Eurotech S.p.A. <[email protected]>
21  * single 8-bit register. The upstream "parent" bus fans out to two,
24  * mux can select only one sub-bus at a time; a switch can select any
36  *	i2c-virtual_cb.c from Brian Kuschak <[email protected]>
45 #include <linux/i2c-mux.h>
55 #include <dt-bindings/mux/mux.h>
98 	u8 enable;	/* used for muxes only */  member
163 		.enable = 0x4,
170 		.enable = 0x4,
176 		.enable = 0x4,
189 		.enable = 0x4,
207 		.enable = 0x8,
226 		.enable = 0x8,
243 		.enable = 0x4,
305 	return __i2c_smbus_xfer(adap, client->addr, client->flags,  in pca954x_reg_write()
313 	if (data->chip->muxtype == pca954x_ismux)  in pca954x_regval()
314 		return chan | data->chip->enable;  in pca954x_regval()
322 	struct i2c_client *client = data->client;  in pca954x_select_chan()
328 	if (data->last_chan != regval) {  in pca954x_select_chan()
329 		ret = pca954x_reg_write(muxc->parent, client, regval);  in pca954x_select_chan()
330 		data->last_chan = ret < 0 ? 0 : regval;  in pca954x_select_chan()
339 	struct i2c_client *client = data->client;  in pca954x_deselect_mux()
342 	idle_state = READ_ONCE(data->idle_state);  in pca954x_deselect_mux()
349 		data->last_chan = 0;  in pca954x_deselect_mux()
350 		return pca954x_reg_write(muxc->parent, client,  in pca954x_deselect_mux()
351 					 data->last_chan);  in pca954x_deselect_mux()
354 	/* otherwise leave as-is */  in pca954x_deselect_mux()
367 	return sprintf(buf, "%d\n", READ_ONCE(data->idle_state));  in idle_state_show()
385 	    (val < 0 || val >= data->chip->nchans))  in idle_state_store()
386 		return -EINVAL;  in idle_state_store()
388 	i2c_lock_bus(muxc->parent, I2C_LOCK_SEGMENT);  in idle_state_store()
390 	WRITE_ONCE(data->idle_state, val);  in idle_state_store()
395 	if (data->last_chan || val != MUX_IDLE_DISCONNECT)  in idle_state_store()
398 	i2c_unlock_bus(muxc->parent, I2C_LOCK_SEGMENT);  in idle_state_store()
411 	ret = i2c_smbus_read_byte(data->client);  in pca954x_irq_handler()
415 	pending = (ret >> PCA954X_IRQ_OFFSET) & (BIT(data->chip->nchans) - 1);  in pca954x_irq_handler()
416 	for_each_set_bit(i, &pending, data->chip->nchans)  in pca954x_irq_handler()
417 		handle_nested_irq(irq_linear_revmap(data->irq, i));  in pca954x_irq_handler()
425 		return -EINVAL;  in pca954x_irq_set_type()
430 	.name = "i2c-mux-pca954x",
437 	struct i2c_client *client = data->client;  in pca954x_irq_setup()
440 	if (!data->chip->has_irq || client->irq <= 0)  in pca954x_irq_setup()
443 	raw_spin_lock_init(&data->lock);  in pca954x_irq_setup()
445 	data->irq = irq_domain_add_linear(client->dev.of_node,  in pca954x_irq_setup()
446 					  data->chip->nchans,  in pca954x_irq_setup()
448 	if (!data->irq)  in pca954x_irq_setup()
449 		return -ENODEV;  in pca954x_irq_setup()
451 	for (c = 0; c < data->chip->nchans; c++) {  in pca954x_irq_setup()
452 		irq = irq_create_mapping(data->irq, c);  in pca954x_irq_setup()
454 			dev_err(&client->dev, "failed irq create map\n");  in pca954x_irq_setup()
455 			return -EINVAL;  in pca954x_irq_setup()
470 	regulator_disable(data->supply);  in pca954x_cleanup()
472 	if (data->irq) {  in pca954x_cleanup()
473 		for (c = 0; c < data->chip->nchans; c++) {  in pca954x_cleanup()
474 			irq = irq_find_mapping(data->irq, c);  in pca954x_cleanup()
477 		irq_domain_remove(data->irq);  in pca954x_cleanup()
486 	if (data->idle_state >= 0)  in pca954x_init()
487 		data->last_chan = pca954x_regval(data, data->idle_state);  in pca954x_init()
489 		data->last_chan = 0; /* Disconnect multiplexer */  in pca954x_init()
491 	if (device_is_compatible(&client->dev, "maxim,max7357")) {  in pca954x_init()
492 		if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {  in pca954x_init()
500 			if (device_property_read_bool(&client->dev, "maxim,isolate-stuck-channel"))  in pca954x_init()
502 			if (device_property_read_bool(&client->dev,  in pca954x_init()
503 						      "maxim,send-flush-out-sequence"))  in pca954x_init()
505 			if (device_property_read_bool(&client->dev,  in pca954x_init()
506 						      "maxim,preconnection-wiggle-test-enable"))  in pca954x_init()
509 			ret = i2c_smbus_write_byte_data(client, data->last_chan, conf);  in pca954x_init()
511 			dev_warn(&client->dev, "Write byte data not supported."  in pca954x_init()
512 				 "Cannot enable enhanced mode features\n");  in pca954x_init()
513 			ret = i2c_smbus_write_byte(client, data->last_chan);  in pca954x_init()
516 		ret = i2c_smbus_write_byte(client, data->last_chan);  in pca954x_init()
520 		data->last_chan = 0;  in pca954x_init()
527 	data->reset_cont = devm_reset_control_get_optional_shared(dev, NULL);  in pca954x_get_reset()
528 	if (IS_ERR(data->reset_cont))  in pca954x_get_reset()
529 		return dev_err_probe(dev, PTR_ERR(data->reset_cont),  in pca954x_get_reset()
531 	else if (data->reset_cont)  in pca954x_get_reset()
535 	 * fallback to legacy reset-gpios  in pca954x_get_reset()
537 	data->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);  in pca954x_get_reset()
538 	if (IS_ERR(data->reset_gpio)) {  in pca954x_get_reset()
539 		return dev_err_probe(dev, PTR_ERR(data->reset_gpio),  in pca954x_get_reset()
548 	if (data->reset_cont)  in pca954x_reset_deassert()
549 		reset_control_deassert(data->reset_cont);  in pca954x_reset_deassert()
551 		gpiod_set_value_cansleep(data->reset_gpio, 0);  in pca954x_reset_deassert()
560 	struct i2c_adapter *adap = client->adapter;  in pca954x_probe()
561 	struct device *dev = &client->dev;  in pca954x_probe()
568 		return -ENODEV;  in pca954x_probe()
573 		return -ENOMEM;  in pca954x_probe()
577 	data->client = client;  in pca954x_probe()
579 	data->supply = devm_regulator_get(dev, "vdd");  in pca954x_probe()
580 	if (IS_ERR(data->supply))  in pca954x_probe()
581 		return dev_err_probe(dev, PTR_ERR(data->supply),  in pca954x_probe()
584 	ret = regulator_enable(data->supply);  in pca954x_probe()
587 				     "Failed to enable vdd supply\n");  in pca954x_probe()
593 	if (data->reset_cont || data->reset_gpio) {  in pca954x_probe()
600 	data->chip = device_get_match_data(dev);  in pca954x_probe()
601 	if (!data->chip)  in pca954x_probe()
602 		data->chip = &chips[id->driver_data];  in pca954x_probe()
604 	if (data->chip->id.manufacturer_id != I2C_DEVICE_ID_NONE) {  in pca954x_probe()
608 		if (ret && ret != -EOPNOTSUPP)  in pca954x_probe()
612 		    (id.manufacturer_id != data->chip->id.manufacturer_id ||  in pca954x_probe()
613 		     id.part_id != data->chip->id.part_id)) {  in pca954x_probe()
614 			dev_warn(dev, "unexpected device id %03x-%03x-%x\n",  in pca954x_probe()
617 			ret = -ENODEV;  in pca954x_probe()
622 	data->idle_state = MUX_IDLE_AS_IS;  in pca954x_probe()
623 	if (device_property_read_u32(dev, "idle-state", &data->idle_state)) {  in pca954x_probe()
624 		if (device_property_read_bool(dev, "i2c-mux-idle-disconnect"))  in pca954x_probe()
625 			data->idle_state = MUX_IDLE_DISCONNECT;  in pca954x_probe()
637 		ret = -ENODEV;  in pca954x_probe()
646 	for (num = 0; num < data->chip->nchans; num++) {  in pca954x_probe()
652 	if (data->irq) {  in pca954x_probe()
653 		ret = devm_request_threaded_irq(dev, data->client->irq,  in pca954x_probe()
668 		 num, data->chip->muxtype == pca954x_ismux  in pca954x_probe()
669 				? "mux" : "switch", client->name);  in pca954x_probe()
682 	device_remove_file(&client->dev, &dev_attr_idle_state);  in pca954x_remove()
696 		dev_err(&client->dev, "failed to verify mux presence\n");  in pca954x_resume()