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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/i2c.h>
- #include <linux/interrupt.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- struct i2c_inst_data {
- const char *type;
- int gpio_irq_idx;
- };
- struct i2c_multi_inst_data {
- int num_clients;
- struct i2c_client *clients[0];
- };
- 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 */
- for (i = 0; inst_data[i].type; i++) {}
- multi = devm_kmalloc(dev,
- offsetof(struct i2c_multi_inst_data, clients[i]),
- GFP_KERNEL);
- if (!multi)
- return -ENOMEM;
- multi->num_clients = i;
- for (i = 0; i < multi->num_clients; 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", match->id,
- inst_data[i].type);
- board_info.dev_name = name;
- board_info.irq = 0;
- if (inst_data[i].gpio_irq_idx != -1) {
- ret = acpi_dev_gpio_irq_get(adev,
- inst_data[i].gpio_irq_idx);
- if (ret < 0) {
- dev_err(dev, "Error requesting irq at index %d: %d\n",
- inst_data[i].gpio_irq_idx, ret);
- goto error;
- }
- board_info.irq = ret;
- }
- multi->clients[i] = i2c_acpi_new_device(dev, i, &board_info);
- if (!multi->clients[i]) {
- dev_err(dev, "Error creating i2c-client, 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", 0 },
- { "bmc150_magn", -1 },
- { "bmg160", -1 },
- {}
- };
- /*
- * 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 },
- { }
- };
- 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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