@@ -1356,6 +1356,17 @@ endmenu
menu "PCI GPIO expanders"
depends on PCI
+config GPIO_AAEON
+ tristate "AAEON GPIO support"
+ depends on ASUS_WMI
+ select MFD_AAEON
+ help
+ Say yes here to support GPIO pins on Single Board Computers produced
+ by AAEON.
+
+ This driver leverages the ASUS WMI interface to access device
+ resources.
+
config GPIO_AMD8111
tristate "AMD 8111 GPIO driver"
depends on X86 || COMPILE_TEST
@@ -23,6 +23,7 @@ obj-$(CONFIG_GPIO_104_IDI_48) += gpio-104-idi-48.o
obj-$(CONFIG_GPIO_104_IDIO_16) += gpio-104-idio-16.o
obj-$(CONFIG_GPIO_74X164) += gpio-74x164.o
obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o
+obj-$(CONFIG_GPIO_AAEON) += gpio-aaeon.o
obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o
obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o
obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o
new file mode 100644
@@ -0,0 +1,205 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AAEON GPIO driver
+ * Copyright (c) 2021, AAEON Ltd.
+ *
+ * Author: Edward Lin <edward1_lin@aaeon.com.tw>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include <linux/acpi.h>
+#include <linux/bitops.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_data/x86/asus-wmi.h>
+#include <linux/platform_device.h>
+
+#define DRVNAME "gpio_aaeon"
+#define ASUS_NB_WMI_EVENT_GUID "0B3CBB35-E3C2-45ED-91C2-4C5A6D195D1C"
+#define AAEON_WMI_MGMT_GUID "97845ED0-4E6D-11DE-8A39-0800200C9A66"
+
+#define GET_GPIO_NUMBER_ID 0x00010000
+#define GET_LEVEL_METHOD_ID 0x00010001
+#define SET_LEVEL_METHOD_ID 0x00010002
+#define GET_DIRECTION_METHOD_ID 0x00010003
+#define SET_DIRECTION_METHOD_ID 0x00010004
+#define GET_SIO_NUMBER_METHOD_ID 0xF0010
+
+struct aaeon_gpio_bank {
+ struct gpio_chip chip;
+ unsigned int regbase;
+ struct aaeon_gpio_data *data;
+};
+
+struct aaeon_gpio_data {
+ int nr_bank;
+ struct aaeon_gpio_bank *bank;
+};
+
+static int aaeon_gpio_get_number(void);
+static int aaeon_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset);
+static int aaeon_gpio_output_set_direction(struct gpio_chip *chip,
+ unsigned int offset, int value);
+static int aaeon_gpio_input_set_direction(struct gpio_chip *chip,
+ unsigned int offset);
+static int aaeon_gpio_get(struct gpio_chip *chip,
+ unsigned int offset);
+static void aaeon_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value);
+
+#define AAEON_GPIO_BANK(_base, _ngpio, _regbase) \
+{ \
+ .chip = { \
+ .label = DRVNAME, \
+ .owner = THIS_MODULE, \
+ .get_direction = aaeon_gpio_get_direction, \
+ .direction_input = aaeon_gpio_input_set_direction, \
+ .direction_output = aaeon_gpio_output_set_direction, \
+ .get = aaeon_gpio_get, \
+ .set = aaeon_gpio_set, \
+ .base = _base, \
+ .ngpio = _ngpio, \
+ .can_sleep = true, \
+ }, \
+ .regbase = _regbase, \
+}
+
+static struct aaeon_gpio_bank aaeon_gpio_bank[] = {
+ AAEON_GPIO_BANK(0, 0, 0xF0),
+};
+
+static int aaeon_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+ int err, retval;
+ u32 dev_id = 0x0;
+
+ dev_id |= offset;
+ err = asus_wmi_evaluate_method(GET_DIRECTION_METHOD_ID, dev_id,
+ 0, &retval);
+ if (err)
+ return err;
+
+ return retval;
+}
+
+static int aaeon_gpio_input_set_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ int err, retval;
+ u32 dev_id;
+
+ dev_id = BIT(16) | offset;
+ err = asus_wmi_evaluate_method(SET_DIRECTION_METHOD_ID, dev_id,
+ 0, &retval);
+ if (err)
+ return err;
+
+ return retval;
+}
+
+static int aaeon_gpio_output_set_direction(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ int err, retval;
+ u32 dev_id = 0x0;
+
+ dev_id |= offset;
+ err = asus_wmi_evaluate_method(SET_DIRECTION_METHOD_ID, dev_id,
+ 0, &retval);
+ if (err)
+ return err;
+
+ return retval;
+}
+
+static int aaeon_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ int err, retval;
+ u32 dev_id = 0x0;
+
+ dev_id |= offset;
+ err = asus_wmi_evaluate_method(GET_LEVEL_METHOD_ID, dev_id, 0, &retval);
+ if (err)
+ return err;
+
+ return retval;
+}
+
+static void aaeon_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ int retval;
+ u32 dev_id = offset;
+
+ if (value)
+ dev_id = BIT(16) | dev_id;
+
+ asus_wmi_evaluate_method(SET_LEVEL_METHOD_ID, dev_id, 0, &retval);
+}
+
+static int aaeon_gpio_get_number(void)
+{
+ int err, retval;
+
+ err = asus_wmi_evaluate_method(GET_GPIO_NUMBER_ID,
+ GET_SIO_NUMBER_METHOD_ID,
+ 0, &retval);
+ if (err)
+ return err;
+
+ return retval;
+}
+
+static int __init aaeon_gpio_probe(struct platform_device *pdev)
+{
+ int err, i;
+ int dio_number = 0;
+ struct aaeon_gpio_data *data;
+ struct aaeon_gpio_bank *bank;
+
+ /* Prevent other drivers adding this platfom device */
+ if (!wmi_has_guid(AAEON_WMI_MGMT_GUID)) {
+ pr_debug("AAEON Management GUID not found\n");
+ return -ENODEV;
+ }
+
+ dio_number = aaeon_gpio_get_number();
+ if (dio_number < 0)
+ return -ENODEV;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->nr_bank = ARRAY_SIZE(aaeon_gpio_bank);
+ data->bank = aaeon_gpio_bank;
+ platform_set_drvdata(pdev, data);
+ bank = &data->bank[0];
+ bank->chip.parent = &pdev->dev;
+ bank->chip.ngpio = dio_number;
+ bank->data = data;
+ err = devm_gpiochip_add_data(&pdev->dev, &bank->chip, bank);
+ if (err)
+ pr_debug("Failed to register gpiochip %d: %d\n", i, err);
+
+ return err;
+}
+
+static struct platform_driver aaeon_gpio_driver = {
+ .driver = {
+ .name = "gpio-aaeon",
+ },
+};
+
+module_platform_driver_probe(aaeon_gpio_driver, aaeon_gpio_probe);
+
+MODULE_ALIAS("platform:gpio-aaeon");
+MODULE_DESCRIPTION("AAEON GPIO Driver");
+MODULE_AUTHOR("Edward Lin <edward1_lin@aaeon.com.tw>");
+MODULE_LICENSE("GPL v2");