platform/x86: Add SEL-3350 platform driver

Add a driver for Schweitzer Engineering Laboratories SEL-3350 computers
front LEDs and power supplies. LED and power supply status is provided
by the Intel SoC GPIO.
Signed-off-by: Robert Joslyn <robert.joslyn@redrectangle.org>
Link: https://lore.kernel.org/r/20230713035714.807819-1-robert.joslyn@redrectangle.orgReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/Kconfig

@@ -1141,6 +1141,21 @@ config WINMATE_FM07_KEYS
 	  buttons below the display. This module adds an input device
 	  that delivers key events when these buttons are pressed.
 
+config SEL3350_PLATFORM
+	tristate "SEL-3350 LEDs and power supplies"
+	depends on ACPI
+	depends on GPIOLIB
+	depends on PINCTRL_BROXTON
+	select POWER_SUPPLY
+	select NEW_LEDS
+	select LEDS_CLASS
+	select LEDS_GPIO
+	help
+	  Support for LEDs and power supplies on SEL-3350 computers.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called sel3350-platform.
+
 endif # X86_PLATFORM_DEVICES
 
 config P2SB

drivers/platform/x86/Makefile

@@ -139,3 +139,6 @@ obj-$(CONFIG_SIEMENS_SIMATIC_IPC_BATT_F7188X)		+= simatic-ipc-batt-f7188x.o
 
 # Winmate
 obj-$(CONFIG_WINMATE_FM07_KEYS)		+= winmate-fm07-keys.o
+
+# SEL
+obj-$(CONFIG_SEL3350_PLATFORM)		+= sel3350-platform.o

drivers/platform/x86/sel3350-platform.c

+// SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause
+/*
+ * Copyright 2023 Schweitzer Engineering Laboratories, Inc.
+ * 2350 NE Hopkins Court, Pullman, WA 99163 USA
+ *
+ * Platform support for the b2093 mainboard used in SEL-3350 computers.
+ * Consumes GPIO from the SoC to provide standard LED and power supply
+ * devices.
+ */
+
+#include <linux/acpi.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/machine.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+
+/* Broxton communities */
+#define BXT_NW "INT3452:01"
+#define BXT_W  "INT3452:02"
+#define BXT_SW "INT3452:03"
+
+#define B2093_GPIO_ACPI_ID "SEL0003"
+
+#define SEL_PS_A        "sel_ps_a"
+#define SEL_PS_A_DETECT "sel_ps_a_detect"
+#define SEL_PS_A_GOOD   "sel_ps_a_good"
+#define SEL_PS_B        "sel_ps_b"
+#define SEL_PS_B_DETECT "sel_ps_b_detect"
+#define SEL_PS_B_GOOD   "sel_ps_b_good"
+
+/* LEDs */
+static const struct gpio_led sel3350_leds[] = {
+	{ .name = "sel:green:aux1" },
+	{ .name = "sel:green:aux2" },
+	{ .name = "sel:green:aux3" },
+	{ .name = "sel:green:aux4" },
+	{ .name = "sel:red:alarm" },
+	{ .name = "sel:green:enabled",
+	  .default_state = LEDS_GPIO_DEFSTATE_ON },
+	{ .name = "sel:red:aux1" },
+	{ .name = "sel:red:aux2" },
+	{ .name = "sel:red:aux3" },
+	{ .name = "sel:red:aux4" },
+};
+
+static const struct gpio_led_platform_data sel3350_leds_pdata = {
+	.num_leds = ARRAY_SIZE(sel3350_leds),
+	.leds = sel3350_leds,
+};
+
+/* Map GPIOs to LEDs */
+static struct gpiod_lookup_table sel3350_leds_table = {
+	.dev_id = "leds-gpio",
+	.table = {
+		GPIO_LOOKUP_IDX(BXT_NW, 49, NULL, 0, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX(BXT_NW, 50, NULL, 1, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX(BXT_NW, 51, NULL, 2, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX(BXT_NW, 52, NULL, 3, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX(BXT_W,  20, NULL, 4, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX(BXT_W,  21, NULL, 5, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX(BXT_SW, 37, NULL, 6, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX(BXT_SW, 38, NULL, 7, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX(BXT_SW, 39, NULL, 8, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX(BXT_SW, 40, NULL, 9, GPIO_ACTIVE_HIGH),
+		{},
+	}
+};
+
+/* Map GPIOs to power supplies */
+static struct gpiod_lookup_table sel3350_gpios_table = {
+	.dev_id = B2093_GPIO_ACPI_ID ":00",
+	.table = {
+		GPIO_LOOKUP(BXT_NW, 44, SEL_PS_A_DETECT, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP(BXT_NW, 45, SEL_PS_A_GOOD,   GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP(BXT_NW, 46, SEL_PS_B_DETECT, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP(BXT_NW, 47, SEL_PS_B_GOOD,   GPIO_ACTIVE_LOW),
+		{},
+	}
+};
+
+/* Power Supplies */
+
+struct sel3350_power_cfg_data {
+	struct gpio_desc *ps_detect;
+	struct gpio_desc *ps_good;
+};
+
+static int sel3350_power_get_property(struct power_supply *psy,
+				      enum power_supply_property psp,
+				      union power_supply_propval *val)
+{
+	struct sel3350_power_cfg_data *data = power_supply_get_drvdata(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_HEALTH:
+		if (gpiod_get_value(data->ps_detect)) {
+			if (gpiod_get_value(data->ps_good))
+				val->intval = POWER_SUPPLY_HEALTH_GOOD;
+			else
+				val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+		} else {
+			val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
+		}
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = gpiod_get_value(data->ps_detect);
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = gpiod_get_value(data->ps_good);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static const enum power_supply_property sel3350_power_properties[] = {
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_ONLINE,
+};
+
+static const struct power_supply_desc sel3350_ps_a_desc = {
+	.name = SEL_PS_A,
+	.type = POWER_SUPPLY_TYPE_MAINS,
+	.properties = sel3350_power_properties,
+	.num_properties = ARRAY_SIZE(sel3350_power_properties),
+	.get_property = sel3350_power_get_property,
+};
+
+static const struct power_supply_desc sel3350_ps_b_desc = {
+	.name = SEL_PS_B,
+	.type = POWER_SUPPLY_TYPE_MAINS,
+	.properties = sel3350_power_properties,
+	.num_properties = ARRAY_SIZE(sel3350_power_properties),
+	.get_property = sel3350_power_get_property,
+};
+
+struct sel3350_data {
+	struct platform_device *leds_pdev;
+	struct power_supply *ps_a;
+	struct power_supply *ps_b;
+	struct sel3350_power_cfg_data ps_a_cfg_data;
+	struct sel3350_power_cfg_data ps_b_cfg_data;
+};
+
+static int sel3350_probe(struct platform_device *pdev)
+{
+	int rs;
+	struct sel3350_data *sel3350;
+	struct power_supply_config ps_cfg = {};
+
+	sel3350 = devm_kzalloc(&pdev->dev, sizeof(struct sel3350_data), GFP_KERNEL);
+	if (!sel3350)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, sel3350);
+
+	gpiod_add_lookup_table(&sel3350_leds_table);
+	gpiod_add_lookup_table(&sel3350_gpios_table);
+
+	sel3350->leds_pdev = platform_device_register_data(
+			NULL,
+			"leds-gpio",
+			PLATFORM_DEVID_NONE,
+			&sel3350_leds_pdata,
+			sizeof(sel3350_leds_pdata));
+	if (IS_ERR(sel3350->leds_pdev)) {
+		rs = PTR_ERR(sel3350->leds_pdev);
+		dev_err(&pdev->dev, "Failed registering platform device: %d\n", rs);
+		goto err_platform;
+	}
+
+	/* Power Supply A */
+	sel3350->ps_a_cfg_data.ps_detect = devm_gpiod_get(&pdev->dev,
+							  SEL_PS_A_DETECT,
+							  GPIOD_IN);
+	sel3350->ps_a_cfg_data.ps_good = devm_gpiod_get(&pdev->dev,
+							SEL_PS_A_GOOD,
+							GPIOD_IN);
+	ps_cfg.drv_data = &sel3350->ps_a_cfg_data;
+	sel3350->ps_a = devm_power_supply_register(&pdev->dev,
+						   &sel3350_ps_a_desc,
+						   &ps_cfg);
+	if (IS_ERR(sel3350->ps_a)) {
+		rs = PTR_ERR(sel3350->ps_a);
+		dev_err(&pdev->dev, "Failed registering power supply A: %d\n", rs);
+		goto err_ps;
+	}
+
+	/* Power Supply B */
+	sel3350->ps_b_cfg_data.ps_detect = devm_gpiod_get(&pdev->dev,
+							  SEL_PS_B_DETECT,
+							  GPIOD_IN);
+	sel3350->ps_b_cfg_data.ps_good = devm_gpiod_get(&pdev->dev,
+							SEL_PS_B_GOOD,
+							GPIOD_IN);
+	ps_cfg.drv_data = &sel3350->ps_b_cfg_data;
+	sel3350->ps_b = devm_power_supply_register(&pdev->dev,
+						   &sel3350_ps_b_desc,
+						   &ps_cfg);
+	if (IS_ERR(sel3350->ps_b)) {
+		rs = PTR_ERR(sel3350->ps_b);
+		dev_err(&pdev->dev, "Failed registering power supply B: %d\n", rs);
+		goto err_ps;
+	}
+
+	return 0;
+
+err_ps:
+	platform_device_unregister(sel3350->leds_pdev);
+err_platform:
+	gpiod_remove_lookup_table(&sel3350_gpios_table);
+	gpiod_remove_lookup_table(&sel3350_leds_table);
+
+	return rs;
+}
+
+static int sel3350_remove(struct platform_device *pdev)
+{
+	struct sel3350_data *sel3350 = platform_get_drvdata(pdev);
+
+	platform_device_unregister(sel3350->leds_pdev);
+	gpiod_remove_lookup_table(&sel3350_gpios_table);
+	gpiod_remove_lookup_table(&sel3350_leds_table);
+
+	return 0;
+}
+
+static const struct acpi_device_id sel3350_device_ids[] = {
+	{ B2093_GPIO_ACPI_ID, 0 },
+	{ "", 0 },
+};
+MODULE_DEVICE_TABLE(acpi, sel3350_device_ids);
+
+static struct platform_driver sel3350_platform_driver = {
+	.probe = sel3350_probe,
+	.remove = sel3350_remove,
+	.driver = {
+		.name = "sel3350-platform",
+		.acpi_match_table = sel3350_device_ids,
+	},
+};
+module_platform_driver(sel3350_platform_driver);
+
+MODULE_AUTHOR("Schweitzer Engineering Laboratories");
+MODULE_DESCRIPTION("SEL-3350 platform driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_SOFTDEP("pre: pinctrl_broxton leds-gpio");