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https://source.denx.de/u-boot/u-boot.git
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bba76a17bd
This commit adds support for the MAX7320 (and clones) gpio expander. Signed-off-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com>
114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* max7320 I2C GPIO EXPANDER DRIVER
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*
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* Copyright (C) 2021 Hannes Schmelzer <oe5hpm@oevsv.at>
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* B&R Industrial Automation GmbH - http://www.br-automation.com
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*
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*/
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#include <common.h>
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#include <dm.h>
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#include <i2c.h>
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#include <asm-generic/gpio.h>
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#include <linux/bitops.h>
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struct max7320_chip {
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u32 outreg;
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};
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static int max7320_direction_output(struct udevice *dev,
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unsigned int offset, int value)
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{
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struct max7320_chip *plat = dev_get_plat(dev);
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct dm_i2c_chip *chip = dev_get_parent_plat(dev);
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int ret;
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if (value)
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plat->outreg |= BIT(offset);
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else
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plat->outreg &= ~BIT(offset);
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ret = dm_i2c_write(dev,
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plat->outreg & 0xff,
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(uint8_t *)&plat->outreg + 1,
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uc_priv->gpio_count > 8 ? 1 : 0);
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if (ret)
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printf("%s i2c write failed to addr %x\n", __func__,
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chip->chip_addr);
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return ret;
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}
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static int max7320_get_value(struct udevice *dev, unsigned int offset)
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{
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struct max7320_chip *plat = dev_get_plat(dev);
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return (plat->outreg >> offset) & 0x1;
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}
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static int max7320_set_value(struct udevice *dev, unsigned int offset,
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int value)
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{
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return max7320_direction_output(dev, offset, value);
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}
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static int max7320_get_function(struct udevice *dev, unsigned int offset)
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{
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return GPIOF_OUTPUT;
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}
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static int max7320_ofdata_plat(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios", 8);
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if (uc_priv->gpio_count > 16) {
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printf("%s: max7320 doesn't support more than 16 gpios!",
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__func__);
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return -EINVAL;
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}
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uc_priv->bank_name = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
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"gpio-bank-name", NULL);
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if (!uc_priv->bank_name)
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uc_priv->bank_name = fdt_get_name(gd->fdt_blob,
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dev_of_offset(dev), NULL);
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return 0;
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}
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static int max7320_gpio_probe(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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debug("%s GPIO controller with %d gpios probed\n",
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uc_priv->bank_name, uc_priv->gpio_count);
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return 0;
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}
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static const struct dm_gpio_ops max7320_gpio_ops = {
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.direction_output = max7320_direction_output,
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.set_value = max7320_set_value,
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.get_value = max7320_get_value,
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.get_function = max7320_get_function,
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};
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static const struct udevice_id max7320_gpio_ids[] = {
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{ .compatible = "maxim,max7320" },
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{ }
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};
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U_BOOT_DRIVER(gpio_max7320) = {
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.name = "gpio_max7320",
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.id = UCLASS_GPIO,
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.ops = &max7320_gpio_ops,
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.of_match = max7320_gpio_ids,
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.of_to_plat = max7320_ofdata_plat,
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.probe = max7320_gpio_probe,
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.plat_auto = sizeof(struct max7320_chip),
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};
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