1 // SPDX-License-Identifier: GPL-2.0-only
14 #include <linux/init.h>
26  *   - Push Pull Output
27  *   - Input
28  *   - Open Drain I/O
37  *   - Group A : by I2C address 0b'110xxxx
38  *   - Group B : by I2C address 0b'101xxxx
49  * and GPIOs from GROUP_A are numbered before those from GROUP_B
52  * NOTE: MAX7328/MAX7329 are drop-in replacements for PCF8574/a, so
57 #define PORT_OUTPUT	0x1	/* 'O' Push-Pull, Output Only */
59 #define PORT_OPENDRAIN	0x3	/* 'P' Open-Drain, I/O */
67 #define GROUP_A(x)	((x) & 0xffff)	/* I2C Addr: 0b'110xxxx */
68 #define GROUP_B(x)	((x) << 16)	/* I2C Addr: 0b'101xxxx */
159 	client = group_a ? chip->client_group_a : chip->client_group_b;  in max732x_writeb()
162 		dev_err(&client->dev, "failed writing\n");  in max732x_writeb()
174 	client = group_a ? chip->client_group_a : chip->client_group_b;  in max732x_readb()
177 		dev_err(&client->dev, "failed reading\n");  in max732x_readb()
187 	return (1u << off) & chip->mask_group_a;  in is_group_a()
210 	mutex_lock(&chip->lock);  in max732x_gpio_set_mask()
212 	reg_out = (off > 7) ? chip->reg_out[1] : chip->reg_out[0];  in max732x_gpio_set_mask()
221 		chip->reg_out[1] = reg_out;  in max732x_gpio_set_mask()
223 		chip->reg_out[0] = reg_out;  in max732x_gpio_set_mask()
225 	mutex_unlock(&chip->lock);  in max732x_gpio_set_mask()
253 	if ((mask & chip->dir_input) == 0) {  in max732x_gpio_direction_input()
254 		dev_dbg(&chip->client->dev, "%s port %d is output only\n",  in max732x_gpio_direction_input()
255 			chip->client->name, off);  in max732x_gpio_direction_input()
256 		return -EACCES;  in max732x_gpio_direction_input()
260 	 * Open-drain pins must be set to high impedance (which is  in max732x_gpio_direction_input()
261 	 * equivalent to output-high) to be turned into an input.  in max732x_gpio_direction_input()
263 	if ((mask & chip->dir_output))  in max732x_gpio_direction_input()
275 	if ((mask & chip->dir_output) == 0) {  in max732x_gpio_direction_output()
276 		dev_dbg(&chip->client->dev, "%s port %d is input only\n",  in max732x_gpio_direction_output()
277 			chip->client->name, off);  in max732x_gpio_direction_output()
278 		return -EACCES;  in max732x_gpio_direction_output()
292 	ret = i2c_master_send(chip->client_group_a, (char *)&val, 2);  in max732x_writew()
294 		dev_err(&chip->client_group_a->dev, "failed writing\n");  in max732x_writew()
305 	ret = i2c_master_recv(chip->client_group_a, (char *)val, 2);  in max732x_readw()
307 		dev_err(&chip->client_group_a->dev, "failed reading\n");  in max732x_readw()
319 	if (chip->irq_mask == chip->irq_mask_cur)  in max732x_irq_update_mask()
322 	chip->irq_mask = chip->irq_mask_cur;  in max732x_irq_update_mask()
324 	if (chip->irq_features == INT_NO_MASK)  in max732x_irq_update_mask()
327 	mutex_lock(&chip->lock);  in max732x_irq_update_mask()
329 	switch (chip->irq_features) {  in max732x_irq_update_mask()
331 		msg = (chip->irq_mask << 8) | chip->reg_out[0];  in max732x_irq_update_mask()
336 		msg = chip->irq_mask | chip->reg_out[0];  in max732x_irq_update_mask()
341 	mutex_unlock(&chip->lock);  in max732x_irq_update_mask()
349 	chip->irq_mask_cur &= ~(1 << d->hwirq);  in max732x_irq_mask()
359 	chip->irq_mask_cur |= 1 << d->hwirq;  in max732x_irq_unmask()
367 	mutex_lock(&chip->irq_lock);  in max732x_irq_bus_lock()
368 	chip->irq_mask_cur = chip->irq_mask;  in max732x_irq_bus_lock()
380 	new_irqs = chip->irq_trig_fall | chip->irq_trig_raise;  in max732x_irq_bus_sync_unlock()
383 		max732x_gpio_direction_input(&chip->gpio_chip, level);  in max732x_irq_bus_sync_unlock()
387 	mutex_unlock(&chip->irq_lock);  in max732x_irq_bus_sync_unlock()
394 	uint16_t off = d->hwirq;  in max732x_irq_set_type()
397 	if (!(mask & chip->dir_input)) {  in max732x_irq_set_type()
398 		dev_dbg(&chip->client->dev, "%s port %d is output only\n",  in max732x_irq_set_type()
399 			chip->client->name, off);  in max732x_irq_set_type()
400 		return -EACCES;  in max732x_irq_set_type()
404 		dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",  in max732x_irq_set_type()
405 			d->irq, type);  in max732x_irq_set_type()
406 		return -EINVAL;  in max732x_irq_set_type()
410 		chip->irq_trig_fall |= mask;  in max732x_irq_set_type()
412 		chip->irq_trig_fall &= ~mask;  in max732x_irq_set_type()
415 		chip->irq_trig_raise |= mask;  in max732x_irq_set_type()
417 		chip->irq_trig_raise &= ~mask;  in max732x_irq_set_type()
426 	irq_set_irq_wake(chip->client->irq, on);  in max732x_irq_set_wake()
456 	trigger &= chip->irq_mask;  in max732x_irq_pending()
462 	cur_stat &= chip->irq_mask;  in max732x_irq_pending()
466 	pending = (old_stat & chip->irq_trig_fall) |  in max732x_irq_pending()
467 		  (cur_stat & chip->irq_trig_raise);  in max732x_irq_pending()
486 		handle_nested_irq(irq_find_mapping(chip->gpio_chip.irq.domain,  in max732x_irq_handler()
498 	struct i2c_client *client = chip->client;  in max732x_irq_setup()
499 	int has_irq = max732x_features[id->driver_data] >> 32;  in max732x_irq_setup()
503 	if (client->irq && has_irq != INT_NONE) {  in max732x_irq_setup()
506 		chip->irq_features = has_irq;  in max732x_irq_setup()
507 		mutex_init(&chip->irq_lock);  in max732x_irq_setup()
509 		ret = devm_request_threaded_irq(&client->dev, client->irq,  in max732x_irq_setup()
512 				dev_name(&client->dev), chip);  in max732x_irq_setup()
514 			dev_err(&client->dev, "failed to request irq %d\n",  in max732x_irq_setup()
515 				client->irq);  in max732x_irq_setup()
519 		girq = &chip->gpio_chip.irq;  in max732x_irq_setup()
522 		girq->parent_handler = NULL;  in max732x_irq_setup()
523 		girq->num_parents = 0;  in max732x_irq_setup()
524 		girq->parents = NULL;  in max732x_irq_setup()
525 		girq->default_type = IRQ_TYPE_NONE;  in max732x_irq_setup()
526 		girq->handler = handle_simple_irq;  in max732x_irq_setup()
527 		girq->threaded = true;  in max732x_irq_setup()
528 		girq->first = irq_base; /* FIXME: get rid of this */  in max732x_irq_setup()
538 	struct i2c_client *client = chip->client;  in max732x_irq_setup()
539 	int has_irq = max732x_features[id->driver_data] >> 32;  in max732x_irq_setup()
541 	if (client->irq && has_irq != INT_NONE)  in max732x_irq_setup()
542 		dev_warn(&client->dev, "interrupt support not compiled in\n");  in max732x_irq_setup()
552 	struct gpio_chip *gc = &chip->gpio_chip;  in max732x_setup_gpio()
553 	uint32_t id_data = (uint32_t)max732x_features[id->driver_data];  in max732x_setup_gpio()
561 			chip->dir_output |= mask;  in max732x_setup_gpio()
564 			chip->dir_input |= mask;  in max732x_setup_gpio()
567 			chip->dir_output |= mask;  in max732x_setup_gpio()
568 			chip->dir_input |= mask;  in max732x_setup_gpio()
575 			chip->mask_group_a |= mask;  in max732x_setup_gpio()
579 	if (chip->dir_input)  in max732x_setup_gpio()
580 		gc->direction_input = max732x_gpio_direction_input;  in max732x_setup_gpio()
581 	if (chip->dir_output) {  in max732x_setup_gpio()
582 		gc->direction_output = max732x_gpio_direction_output;  in max732x_setup_gpio()
583 		gc->set = max732x_gpio_set_value;  in max732x_setup_gpio()
584 		gc->set_multiple = max732x_gpio_set_multiple;  in max732x_setup_gpio()
586 	gc->get = max732x_gpio_get_value;  in max732x_setup_gpio()
587 	gc->can_sleep = true;  in max732x_setup_gpio()
589 	gc->base = gpio_start;  in max732x_setup_gpio()
590 	gc->ngpio = port;  in max732x_setup_gpio()
591 	gc->label = chip->client->name;  in max732x_setup_gpio()
592 	gc->parent = &chip->client->dev;  in max732x_setup_gpio()
593 	gc->owner = THIS_MODULE;  in max732x_setup_gpio()
606 	pdata->gpio_base = -1;  in of_gpio_max732x()
621 	pdata = dev_get_platdata(&client->dev);  in max732x_probe()
622 	node = client->dev.of_node;  in max732x_probe()
625 		pdata = of_gpio_max732x(&client->dev);  in max732x_probe()
628 		dev_dbg(&client->dev, "no platform data\n");  in max732x_probe()
629 		return -EINVAL;  in max732x_probe()
632 	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);  in max732x_probe()
634 		return -ENOMEM;  in max732x_probe()
635 	chip->client = client;  in max732x_probe()
637 	nr_port = max732x_setup_gpio(chip, id, pdata->gpio_base);  in max732x_probe()
638 	chip->gpio_chip.parent = &client->dev;  in max732x_probe()
640 	addr_a = (client->addr & 0x0f) | 0x60;  in max732x_probe()
641 	addr_b = (client->addr & 0x0f) | 0x50;  in max732x_probe()
643 	switch (client->addr & 0x70) {  in max732x_probe()
645 		chip->client_group_a = client;  in max732x_probe()
647 			c = devm_i2c_new_dummy_device(&client->dev,  in max732x_probe()
648 						      client->adapter, addr_b);  in max732x_probe()
650 				dev_err(&client->dev,  in max732x_probe()
654 			chip->client_group_b = chip->client_dummy = c;  in max732x_probe()
658 		chip->client_group_b = client;  in max732x_probe()
660 			c = devm_i2c_new_dummy_device(&client->dev,  in max732x_probe()
661 						      client->adapter, addr_a);  in max732x_probe()
663 				dev_err(&client->dev,  in max732x_probe()
667 			chip->client_group_a = chip->client_dummy = c;  in max732x_probe()
671 		dev_err(&client->dev, "invalid I2C address specified %02x\n",  in max732x_probe()
672 				client->addr);  in max732x_probe()
673 		return -EINVAL;  in max732x_probe()
676 	if (nr_port > 8 && !chip->client_dummy) {  in max732x_probe()
677 		dev_err(&client->dev,  in max732x_probe()
679 		return -ENODEV;  in max732x_probe()
682 	mutex_init(&chip->lock);  in max732x_probe()
684 	ret = max732x_readb(chip, is_group_a(chip, 0), &chip->reg_out[0]);  in max732x_probe()
688 		ret = max732x_readb(chip, is_group_a(chip, 8), &chip->reg_out[1]);  in max732x_probe()
697 	ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);  in max732x_probe()
719  * subsys initcalls that may rely on these GPIOs