1 // SPDX-License-Identifier: GPL-2.0-only
3  *  74Hx164 - Generic serial-in/parallel-out 8-bits shift register GPIO driver
38 	return spi_write(to_spi_device(chip->gpio_chip.parent), chip->buffer,  in __gen_74x164_write_config()
39 			 chip->registers);  in __gen_74x164_write_config()
45 	u8 bank = chip->registers - 1 - offset / 8;  in gen_74x164_get_value()  local
48 	guard(mutex)(&chip->lock);  in gen_74x164_get_value()
50 	return !!(chip->buffer[bank] & BIT(pin));  in gen_74x164_get_value()
57 	u8 bank = chip->registers - 1 - offset / 8;  in gen_74x164_set_value()  local
60 	guard(mutex)(&chip->lock);  in gen_74x164_set_value()
63 		chip->buffer[bank] |= BIT(pin);  in gen_74x164_set_value()
65 		chip->buffer[bank] &= ~BIT(pin);  in gen_74x164_set_value()
76 	size_t bank;  in gen_74x164_set_multiple()  local
79 	guard(mutex)(&chip->lock);  in gen_74x164_set_multiple()
81 	for_each_set_clump8(offset, bankmask, mask, chip->registers * 8) {  in gen_74x164_set_multiple()
82 		bank = chip->registers - 1 - offset / 8;  in gen_74x164_set_multiple()
85 		chip->buffer[bank] &= ~bankmask;  in gen_74x164_set_multiple()
86 		chip->buffer[bank] |= bitmask;  in gen_74x164_set_multiple()
102 	gpiod_set_value_cansleep(chip->gpiod_oe, 0);  in gen_74x164_deactivate()
107 	gpiod_set_value_cansleep(chip->gpiod_oe, 1);  in gen_74x164_activate()
113 	struct device *dev = &spi->dev;  in gen_74x164_probe()
121 	spi->bits_per_word = 8;  in gen_74x164_probe()
127 	ret = device_property_read_u32(dev, "registers-number", &nregs);  in gen_74x164_probe()
129 		return dev_err_probe(dev, ret, "Missing 'registers-number' property.\n");  in gen_74x164_probe()
133 		return -ENOMEM;  in gen_74x164_probe()
135 	chip->registers = nregs;  in gen_74x164_probe()
137 	chip->gpiod_oe = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);  in gen_74x164_probe()
138 	if (IS_ERR(chip->gpiod_oe))  in gen_74x164_probe()
139 		return PTR_ERR(chip->gpiod_oe);  in gen_74x164_probe()
141 	chip->gpio_chip.label = spi->modalias;  in gen_74x164_probe()
142 	chip->gpio_chip.direction_output = gen_74x164_direction_output;  in gen_74x164_probe()
143 	chip->gpio_chip.get = gen_74x164_get_value;  in gen_74x164_probe()
144 	chip->gpio_chip.set = gen_74x164_set_value;  in gen_74x164_probe()
145 	chip->gpio_chip.set_multiple = gen_74x164_set_multiple;  in gen_74x164_probe()
146 	chip->gpio_chip.base = -1;  in gen_74x164_probe()
147 	chip->gpio_chip.ngpio = GEN_74X164_NUMBER_GPIOS * chip->registers;  in gen_74x164_probe()
148 	chip->gpio_chip.can_sleep = true;  in gen_74x164_probe()
149 	chip->gpio_chip.parent = dev;  in gen_74x164_probe()
150 	chip->gpio_chip.owner = THIS_MODULE;  in gen_74x164_probe()
152 	ret = devm_mutex_init(dev, &chip->lock);  in gen_74x164_probe()
164 	return devm_gpiochip_add_data(dev, &chip->gpio_chip, chip);  in gen_74x164_probe()
168 	{ .name = "74hc595" },
169 	{ .name = "74lvc594" },
183 		.name		= "74x164",
193 MODULE_DESCRIPTION("GPIO expander driver for 74X164 8-bits shift register");