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@@ -0,0 +1,113 @@
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+// 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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+
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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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+
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+struct max7320_chip {
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+ u32 outreg;
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+};
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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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+
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+ int ret;
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+
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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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+
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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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+
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+ return ret;
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+}
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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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+
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+ return (plat->outreg >> offset) & 0x1;
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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+ return 0;
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+}
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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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+
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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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+
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+ return 0;
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+}
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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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+
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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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+
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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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