platform/x86: i2c-multi-instantiate: Rename it for a generic serial driver name

Rename I2C multi instantiate driver to serial-multi-instantiate for
upcoming addition of SPI support

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220121172431.6876-6-sbinding@opensource.cirrus.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 173 insertions, 0 deletions

diff --git a/drivers/platform/x86/serial-multi-instantiate.c b/drivers/platform/x86/serial-multi-instantiate.c
new file mode 100644
index 000000000000..9af5bcd466d1
--- /dev/null
+++ b/drivers/platform/x86/serial-multi-instantiate.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Serial multi-instantiate driver, pseudo driver to instantiate multiple
+ * client devices from a single fwnode.
+ *
+ * Copyright 2018 Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <linux/acpi.h>
+#include <linux/bits.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/types.h>
+
+#define IRQ_RESOURCE_TYPE	GENMASK(1, 0)
+#define IRQ_RESOURCE_NONE	0
+#define IRQ_RESOURCE_GPIO	1
+#define IRQ_RESOURCE_APIC	2
+
+struct smi_instance {
+	const char *type;
+	unsigned int flags;
+	int irq_idx;
+};
+
+struct smi {
+	int i2c_num;
+	struct i2c_client *i2c_devs[];
+};
+
+static int smi_probe(struct platform_device *pdev)
+{
+	struct i2c_board_info board_info = {};
+	const struct smi_instance *inst;
+	struct device *dev = &pdev->dev;
+	struct acpi_device *adev;
+	struct smi *smi;
+	char name[32];
+	int i, ret;
+
+	inst = device_get_match_data(dev);
+	if (!inst) {
+		dev_err(dev, "Error ACPI match data is missing\n");
+		return -ENODEV;
+	}
+
+	adev = ACPI_COMPANION(dev);
+
+	/* Count number of clients to instantiate */
+	ret = i2c_acpi_client_count(adev);
+	if (ret < 0)
+		return ret;
+
+	smi = devm_kmalloc(dev, struct_size(smi, i2c_devs, ret), GFP_KERNEL);
+	if (!smi)
+		return -ENOMEM;
+
+	smi->i2c_num = ret;
+
+	for (i = 0; i < smi->i2c_num && inst[i].type; i++) {
+		memset(&board_info, 0, sizeof(board_info));
+		strlcpy(board_info.type, inst[i].type, I2C_NAME_SIZE);
+		snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst[i].type, i);
+		board_info.dev_name = name;
+		switch (inst[i].flags & IRQ_RESOURCE_TYPE) {
+		case IRQ_RESOURCE_GPIO:
+			ret = acpi_dev_gpio_irq_get(adev, inst[i].irq_idx);
+			if (ret < 0) {
+				dev_err(dev, "Error requesting irq at index %d: %d\n",
+						inst[i].irq_idx, ret);
+				goto error;
+			}
+			board_info.irq = ret;
+			break;
+		case IRQ_RESOURCE_APIC:
+			ret = platform_get_irq(pdev, inst[i].irq_idx);
+			if (ret < 0) {
+				dev_dbg(dev, "Error requesting irq at index %d: %d\n",
+					inst[i].irq_idx, ret);
+				goto error;
+			}
+			board_info.irq = ret;
+			break;
+		default:
+			board_info.irq = 0;
+			break;
+		}
+		smi->i2c_devs[i] = i2c_acpi_new_device(dev, i, &board_info);
+		if (IS_ERR(smi->i2c_devs[i])) {
+			ret = dev_err_probe(dev, PTR_ERR(smi->i2c_devs[i]),
+					    "Error creating i2c-client, idx %d\n", i);
+			goto error;
+		}
+	}
+	if (i < smi->i2c_num) {
+		dev_err(dev, "Error finding driver, idx %d\n", i);
+		ret = -ENODEV;
+		goto error;
+	}
+
+	platform_set_drvdata(pdev, smi);
+	return 0;
+
+error:
+	while (--i >= 0)
+		i2c_unregister_device(smi->i2c_devs[i]);
+
+	return ret;
+}
+
+static int smi_remove(struct platform_device *pdev)
+{
+	struct smi *smi = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < smi->i2c_num; i++)
+		i2c_unregister_device(smi->i2c_devs[i]);
+
+	return 0;
+}
+
+static const struct smi_instance bsg1160_data[]  = {
+	{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
+	{ "bmc150_magn" },
+	{ "bmg160" },
+	{}
+};
+
+static const struct smi_instance bsg2150_data[]  = {
+	{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
+	{ "bmc150_magn" },
+	/* The resources describe a 3th client, but it is not really there. */
+	{ "bsg2150_dummy_dev" },
+	{}
+};
+
+static const struct smi_instance int3515_data[]  = {
+	{ "tps6598x", IRQ_RESOURCE_APIC, 0 },
+	{ "tps6598x", IRQ_RESOURCE_APIC, 1 },
+	{ "tps6598x", IRQ_RESOURCE_APIC, 2 },
+	{ "tps6598x", IRQ_RESOURCE_APIC, 3 },
+	{}
+};
+
+/*
+ * Note new device-ids must also be added to ignore_serial_bus_ids in
+ * drivers/acpi/scan.c: acpi_device_enumeration_by_parent().
+ */
+static const struct acpi_device_id smi_acpi_ids[] = {
+	{ "BSG1160", (unsigned long)bsg1160_data },
+	{ "BSG2150", (unsigned long)bsg2150_data },
+	{ "INT3515", (unsigned long)int3515_data },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, smi_acpi_ids);
+
+static struct platform_driver smi_driver = {
+	.driver	= {
+		.name = "Serial bus multi instantiate pseudo device driver",
+		.acpi_match_table = smi_acpi_ids,
+	},
+	.probe = smi_probe,
+	.remove = smi_remove,
+};
+module_platform_driver(smi_driver);
+
+MODULE_DESCRIPTION("Serial multi instantiate pseudo device driver");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL");