drivers/platform/x86/meraki-mx100.c

// SPDX-License-Identifier: GPL-2.0+

/*
 * Cisco Meraki MX100 (Tinkerbell) board platform driver
 *
 * Based off of arch/x86/platform/meraki/tink.c from the
 * Meraki GPL release meraki-firmware-sources-r23-20150601
 *
 * Format inspired by platform/x86/pcengines-apuv2.c
 *
 * Copyright (C) 2021 Chris Blake <chrisrblake93@gmail.com>
 */

#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <linux/dmi.h>
#include <linux/err.h>
#include <linux/gpio/machine.h>
#include <linux/gpio/property.h>
#include <linux/input-event-codes.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>

#define TINK_GPIO_DRIVER_NAME "gpio_ich"

static const struct software_node gpio_ich_node = {
	.name = TINK_GPIO_DRIVER_NAME,
};

/* LEDs */
static const struct software_node tink_gpio_leds_node = {
	.name = "meraki-mx100-leds",
};

static const struct property_entry tink_internet_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:internet"),
	PROPERTY_ENTRY_STRING("linux,default-trigger", "default-on"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 11, GPIO_ACTIVE_LOW),
	{ }
};

static const struct software_node tink_internet_led_node = {
	.name = "internet-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_internet_led_props,
};

static const struct property_entry tink_lan2_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:lan2"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 18, GPIO_ACTIVE_HIGH),
	{ }
};

static const struct software_node tink_lan2_led_node = {
	.name = "lan2-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_lan2_led_props,
};

static const struct property_entry tink_lan3_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:lan3"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 20, GPIO_ACTIVE_HIGH),
	{ }
};

static const struct software_node tink_lan3_led_node = {
	.name = "lan3-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_lan3_led_props,
};

static const struct property_entry tink_lan4_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:lan4"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 22, GPIO_ACTIVE_HIGH),
	{ }
};

static const struct software_node tink_lan4_led_node = {
	.name = "lan4-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_lan4_led_props,
};

static const struct property_entry tink_lan5_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:lan5"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 23, GPIO_ACTIVE_HIGH),
	{ }
};

static const struct software_node tink_lan5_led_node = {
	.name = "lan5-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_lan5_led_props,
};

static const struct property_entry tink_lan6_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:lan6"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 32, GPIO_ACTIVE_HIGH),
	{ }
};

static const struct software_node tink_lan6_led_node = {
	.name = "lan6-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_lan6_led_props,
};

static const struct property_entry tink_lan7_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:lan7"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 34, GPIO_ACTIVE_HIGH),
	{ }
};

static const struct software_node tink_lan7_led_node = {
	.name = "lan7-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_lan7_led_props,
};

static const struct property_entry tink_lan8_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:lan8"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 35, GPIO_ACTIVE_HIGH),
	{ }
};

static const struct software_node tink_lan8_led_node = {
	.name = "lan8-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_lan8_led_props,
};

static const struct property_entry tink_lan9_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:lan9"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 36, GPIO_ACTIVE_HIGH),
	{ }
};

static const struct software_node tink_lan9_led_node = {
	.name = "lan9-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_lan9_led_props,
};

static const struct property_entry tink_lan10_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:lan10"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 37, GPIO_ACTIVE_HIGH),
	{ }
};

static const struct software_node tink_lan10_led_node = {
	.name = "lan10-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_lan10_led_props,
};

static const struct property_entry tink_lan11_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:lan11"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 48, GPIO_ACTIVE_HIGH),
	{ }
};

static const struct software_node tink_lan11_led_node = {
	.name = "lan11-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_lan11_led_props,
};

static const struct property_entry tink_ha_green_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:ha"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 16, GPIO_ACTIVE_LOW),
	{ }
};

static const struct software_node tink_ha_green_led_node = {
	.name = "ha-green-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_ha_green_led_props,
};

static const struct property_entry tink_ha_orange_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:orange:ha"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 7, GPIO_ACTIVE_LOW),
	{ }
};

static const struct software_node tink_ha_orange_led_node = {
	.name = "ha-orange-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_ha_orange_led_props,
};

static const struct property_entry tink_usb_green_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:green:usb"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 21, GPIO_ACTIVE_LOW),
	{ }
};

static const struct software_node tink_usb_green_led_node = {
	.name = "usb-green-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_usb_green_led_props,
};

static const struct property_entry tink_usb_orange_led_props[] = {
	PROPERTY_ENTRY_STRING("label", "mx100:orange:usb"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 19, GPIO_ACTIVE_LOW),
	{ }
};

static const struct software_node tink_usb_orange_led_node = {
	.name = "usb-orange-led",
	.parent = &tink_gpio_leds_node,
	.properties = tink_usb_orange_led_props,
};

/* Reset Button */
static const struct property_entry tink_gpio_keys_props[] = {
	PROPERTY_ENTRY_U32("poll-interval", 20),
	{ }
};

static const struct software_node tink_gpio_keys_node = {
	.name = "mx100-keys",
	.properties = tink_gpio_keys_props,
};

static const struct property_entry tink_reset_key_props[] = {
	PROPERTY_ENTRY_U32("linux,code", KEY_RESTART),
	PROPERTY_ENTRY_STRING("label", "Reset"),
	PROPERTY_ENTRY_GPIO("gpios", &gpio_ich_node, 60, GPIO_ACTIVE_LOW),
	PROPERTY_ENTRY_U32("linux,input-type", EV_KEY),
	PROPERTY_ENTRY_U32("debounce-interval", 100),
	{ }
};

static const struct software_node tink_reset_key_node = {
	.name = "reset",
	.parent = &tink_gpio_keys_node,
	.properties = tink_reset_key_props,
};

static const struct software_node *tink_swnodes[] = {
	&gpio_ich_node,
	/* LEDs nodes */
	&tink_gpio_leds_node,
	&tink_internet_led_node,
	&tink_lan2_led_node,
	&tink_lan3_led_node,
	&tink_lan4_led_node,
	&tink_lan5_led_node,
	&tink_lan6_led_node,
	&tink_lan7_led_node,
	&tink_lan8_led_node,
	&tink_lan9_led_node,
	&tink_lan10_led_node,
	&tink_lan11_led_node,
	&tink_ha_green_led_node,
	&tink_ha_orange_led_node,
	&tink_usb_green_led_node,
	&tink_usb_orange_led_node,
	/* Keys nodes */
	&tink_gpio_keys_node,
	&tink_reset_key_node,
	NULL
};

/* Board setup */
static const struct dmi_system_id tink_systems[] __initconst = {
	{
		.matches = {
			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Cisco"),
			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "MX100-HW"),
		},
	},
	{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(dmi, tink_systems);

static struct platform_device *tink_leds_pdev;
static struct platform_device *tink_keys_pdev;

static int __init tink_board_init(void)
{
	struct platform_device_info keys_info = {
		.name = "gpio-keys-polled",
		.id = PLATFORM_DEVID_NONE,
	};
	struct platform_device_info leds_info = {
		.name = "leds-gpio",
		.id = PLATFORM_DEVID_NONE,
	};
	int err;

	if (!dmi_first_match(tink_systems))
		return -ENODEV;

	/*
	 * We need to make sure that GPIO60 isn't set to native mode as is default since it's our
	 * Reset Button. To do this, write to GPIO_USE_SEL2 to have GPIO60 set to GPIO mode.
	 * This is documented on page 1609 of the PCH datasheet, order number 327879-005US
	 */
	outl(inl(0x530) | BIT(28), 0x530);

	err = software_node_register_node_group(tink_swnodes);
	if (err) {
		pr_err("failed to register software nodes: %d\n", err);
		return err;
	}

	leds_info.fwnode = software_node_fwnode(&tink_gpio_leds_node);
	tink_leds_pdev = platform_device_register_full(&leds_info);
	if (IS_ERR(tink_leds_pdev)) {
		err = PTR_ERR(tink_leds_pdev);
		pr_err("failed to create LED device: %d\n", err);
		goto err_unregister_swnodes;
	}

	keys_info.fwnode = software_node_fwnode(&tink_gpio_keys_node);
	tink_keys_pdev = platform_device_register_full(&keys_info);
	if (IS_ERR(tink_keys_pdev)) {
		err = PTR_ERR(tink_keys_pdev);
		pr_err("failed to create key device: %d\n", err);
		goto err_unregister_leds;
	}

	return 0;

err_unregister_leds:
	platform_device_unregister(tink_leds_pdev);
err_unregister_swnodes:
	software_node_unregister_node_group(tink_swnodes);
	return err;
}
module_init(tink_board_init);

static void __exit tink_board_exit(void)
{
	platform_device_unregister(tink_keys_pdev);
	platform_device_unregister(tink_leds_pdev);
	software_node_unregister_node_group(tink_swnodes);
}
module_exit(tink_board_exit);

MODULE_AUTHOR("Chris Blake <chrisrblake93@gmail.com>");
MODULE_DESCRIPTION("Cisco Meraki MX100 Platform Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:meraki-mx100");