| // 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[0]; |
| }; |
| |
| 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, |
| offsetof(struct i2c_multi_inst_data, 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", match->id, |
| 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); |
| } |
| 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" }, |
| {} |
| }; |
| |
| 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 }, |
| { "INT3515", (unsigned long)int3515_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"); |