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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * I2C multi-instantiate driver, pseudo driver to instantiate multiple
- * i2c-clients 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/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 i2c_inst_data {
- const char *type;
- unsigned int flags;
- int irq_idx;
- };
- struct i2c_multi_inst_data {
- int num_clients;
- struct i2c_client *clients[];
- };
- static int i2c_multi_inst_count(struct acpi_resource *ares, void *data)
- {
- struct acpi_resource_i2c_serialbus *sb;
- int *count = data;
- if (i2c_acpi_get_i2c_resource(ares, &sb))
- *count = *count + 1;
- return 1;
- }
- static int i2c_multi_inst_count_resources(struct acpi_device *adev)
- {
- LIST_HEAD(r);
- int count = 0;
- int ret;
- ret = acpi_dev_get_resources(adev, &r, i2c_multi_inst_count, &count);
- if (ret < 0)
- return ret;
- acpi_dev_free_resource_list(&r);
- return count;
- }
- static int i2c_multi_inst_probe(struct platform_device *pdev)
- {
- struct i2c_multi_inst_data *multi;
- const struct acpi_device_id *match;
- const struct i2c_inst_data *inst_data;
- struct i2c_board_info board_info = {};
- struct device *dev = &pdev->dev;
- struct acpi_device *adev;
- char name[32];
- int i, ret;
- match = acpi_match_device(dev->driver->acpi_match_table, dev);
- if (!match) {
- dev_err(dev, "Error ACPI match data is missing\n");
- return -ENODEV;
- }
- inst_data = (const struct i2c_inst_data *)match->driver_data;
- adev = ACPI_COMPANION(dev);
- /* Count number of clients to instantiate */
- ret = i2c_multi_inst_count_resources(adev);
- if (ret < 0)
- return ret;
- multi = devm_kmalloc(dev, struct_size(multi, clients, ret), GFP_KERNEL);
- if (!multi)
- return -ENOMEM;
- multi->num_clients = ret;
- for (i = 0; i < multi->num_clients && inst_data[i].type; i++) {
- memset(&board_info, 0, sizeof(board_info));
- strlcpy(board_info.type, inst_data[i].type, I2C_NAME_SIZE);
- snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev),
- inst_data[i].type, i);
- board_info.dev_name = name;
- switch (inst_data[i].flags & IRQ_RESOURCE_TYPE) {
- case IRQ_RESOURCE_GPIO:
- ret = acpi_dev_gpio_irq_get(adev, inst_data[i].irq_idx);
- if (ret < 0) {
- dev_err(dev, "Error requesting irq at index %d: %d\n",
- inst_data[i].irq_idx, ret);
- goto error;
- }
- board_info.irq = ret;
- break;
- case IRQ_RESOURCE_APIC:
- ret = platform_get_irq(pdev, inst_data[i].irq_idx);
- if (ret < 0) {
- dev_dbg(dev, "Error requesting irq at index %d: %d\n",
- inst_data[i].irq_idx, ret);
- goto error;
- }
- board_info.irq = ret;
- break;
- default:
- board_info.irq = 0;
- break;
- }
- multi->clients[i] = i2c_acpi_new_device(dev, i, &board_info);
- if (IS_ERR(multi->clients[i])) {
- ret = PTR_ERR(multi->clients[i]);
- if (ret != -EPROBE_DEFER)
- dev_err(dev, "Error creating i2c-client, idx %d\n", i);
- goto error;
- }
- }
- if (i < multi->num_clients) {
- dev_err(dev, "Error finding driver, idx %d\n", i);
- ret = -ENODEV;
- goto error;
- }
- platform_set_drvdata(pdev, multi);
- return 0;
- error:
- while (--i >= 0)
- i2c_unregister_device(multi->clients[i]);
- return ret;
- }
- static int i2c_multi_inst_remove(struct platform_device *pdev)
- {
- struct i2c_multi_inst_data *multi = platform_get_drvdata(pdev);
- int i;
- for (i = 0; i < multi->num_clients; i++)
- i2c_unregister_device(multi->clients[i]);
- return 0;
- }
- static const struct i2c_inst_data bsg1160_data[] = {
- { "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
- { "bmc150_magn" },
- { "bmg160" },
- {}
- };
- static const struct i2c_inst_data 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" },
- {}
- };
- /*
- * Device with _HID INT3515 (TI PD controllers) has some unresolved interrupt
- * issues. The most common problem seen is interrupt flood.
- *
- * There are at least two known causes. Firstly, on some boards, the
- * I2CSerialBus resource index does not match the Interrupt resource, i.e. they
- * are not one-to-one mapped like in the array below. Secondly, on some boards
- * the IRQ line from the PD controller is not actually connected at all. But the
- * interrupt flood is also seen on some boards where those are not a problem, so
- * there are some other problems as well.
- *
- * Because of the issues with the interrupt, the device is disabled for now. If
- * you wish to debug the issues, uncomment the below, and add an entry for the
- * INT3515 device to the i2c_multi_instance_ids table.
- *
- * static const struct i2c_inst_data 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 i2c_multi_instantiate_ids in
- * drivers/acpi/scan.c: acpi_device_enumeration_by_parent().
- */
- static const struct acpi_device_id i2c_multi_inst_acpi_ids[] = {
- { "BSG1160", (unsigned long)bsg1160_data },
- { "BSG2150", (unsigned long)bsg2150_data },
- { }
- };
- MODULE_DEVICE_TABLE(acpi, i2c_multi_inst_acpi_ids);
- static struct platform_driver i2c_multi_inst_driver = {
- .driver = {
- .name = "I2C multi instantiate pseudo device driver",
- .acpi_match_table = ACPI_PTR(i2c_multi_inst_acpi_ids),
- },
- .probe = i2c_multi_inst_probe,
- .remove = i2c_multi_inst_remove,
- };
- module_platform_driver(i2c_multi_inst_driver);
- MODULE_DESCRIPTION("I2C multi instantiate pseudo device driver");
- MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
- MODULE_LICENSE("GPL");
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