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214 lines
5.6 KiB
214 lines
5.6 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* I2C multi-instantiate driver, pseudo driver to instantiate multiple |
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* i2c-clients from a single fwnode. |
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* |
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* Copyright 2018 Hans de Goede <[email protected]> |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/bits.h> |
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#include <linux/i2c.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/property.h> |
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#include <linux/types.h> |
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#define IRQ_RESOURCE_TYPE GENMASK(1, 0) |
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#define IRQ_RESOURCE_NONE 0 |
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#define IRQ_RESOURCE_GPIO 1 |
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#define IRQ_RESOURCE_APIC 2 |
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struct i2c_inst_data { |
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const char *type; |
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unsigned int flags; |
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int irq_idx; |
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}; |
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struct i2c_multi_inst_data { |
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int num_clients; |
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struct i2c_client *clients[]; |
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}; |
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static int i2c_multi_inst_count(struct acpi_resource *ares, void *data) |
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{ |
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struct acpi_resource_i2c_serialbus *sb; |
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int *count = data; |
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if (i2c_acpi_get_i2c_resource(ares, &sb)) |
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*count = *count + 1; |
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return 1; |
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} |
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static int i2c_multi_inst_count_resources(struct acpi_device *adev) |
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{ |
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LIST_HEAD(r); |
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int count = 0; |
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int ret; |
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ret = acpi_dev_get_resources(adev, &r, i2c_multi_inst_count, &count); |
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if (ret < 0) |
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return ret; |
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acpi_dev_free_resource_list(&r); |
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return count; |
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} |
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static int i2c_multi_inst_probe(struct platform_device *pdev) |
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{ |
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struct i2c_multi_inst_data *multi; |
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const struct i2c_inst_data *inst_data; |
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struct i2c_board_info board_info = {}; |
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struct device *dev = &pdev->dev; |
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struct acpi_device *adev; |
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char name[32]; |
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int i, ret; |
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inst_data = device_get_match_data(dev); |
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if (!inst_data) { |
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dev_err(dev, "Error ACPI match data is missing\n"); |
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return -ENODEV; |
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} |
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adev = ACPI_COMPANION(dev); |
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/* Count number of clients to instantiate */ |
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ret = i2c_multi_inst_count_resources(adev); |
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if (ret < 0) |
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return ret; |
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multi = devm_kmalloc(dev, struct_size(multi, clients, ret), GFP_KERNEL); |
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if (!multi) |
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return -ENOMEM; |
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multi->num_clients = ret; |
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for (i = 0; i < multi->num_clients && inst_data[i].type; i++) { |
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memset(&board_info, 0, sizeof(board_info)); |
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strlcpy(board_info.type, inst_data[i].type, I2C_NAME_SIZE); |
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snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), |
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inst_data[i].type, i); |
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board_info.dev_name = name; |
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switch (inst_data[i].flags & IRQ_RESOURCE_TYPE) { |
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case IRQ_RESOURCE_GPIO: |
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ret = acpi_dev_gpio_irq_get(adev, inst_data[i].irq_idx); |
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if (ret < 0) { |
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dev_err(dev, "Error requesting irq at index %d: %d\n", |
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inst_data[i].irq_idx, ret); |
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goto error; |
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} |
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board_info.irq = ret; |
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break; |
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case IRQ_RESOURCE_APIC: |
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ret = platform_get_irq(pdev, inst_data[i].irq_idx); |
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if (ret < 0) { |
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dev_dbg(dev, "Error requesting irq at index %d: %d\n", |
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inst_data[i].irq_idx, ret); |
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goto error; |
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} |
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board_info.irq = ret; |
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break; |
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default: |
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board_info.irq = 0; |
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break; |
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} |
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multi->clients[i] = i2c_acpi_new_device(dev, i, &board_info); |
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if (IS_ERR(multi->clients[i])) { |
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ret = dev_err_probe(dev, PTR_ERR(multi->clients[i]), |
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"Error creating i2c-client, idx %d\n", i); |
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goto error; |
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} |
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} |
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if (i < multi->num_clients) { |
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dev_err(dev, "Error finding driver, idx %d\n", i); |
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ret = -ENODEV; |
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goto error; |
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} |
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platform_set_drvdata(pdev, multi); |
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return 0; |
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error: |
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while (--i >= 0) |
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i2c_unregister_device(multi->clients[i]); |
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return ret; |
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} |
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static int i2c_multi_inst_remove(struct platform_device *pdev) |
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{ |
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struct i2c_multi_inst_data *multi = platform_get_drvdata(pdev); |
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int i; |
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for (i = 0; i < multi->num_clients; i++) |
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i2c_unregister_device(multi->clients[i]); |
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return 0; |
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} |
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static const struct i2c_inst_data bsg1160_data[] = { |
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{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 }, |
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{ "bmc150_magn" }, |
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{ "bmg160" }, |
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{} |
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}; |
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static const struct i2c_inst_data bsg2150_data[] = { |
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{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 }, |
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{ "bmc150_magn" }, |
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/* The resources describe a 3th client, but it is not really there. */ |
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{ "bsg2150_dummy_dev" }, |
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{} |
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}; |
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/* |
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* Device with _HID INT3515 (TI PD controllers) has some unresolved interrupt |
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* issues. The most common problem seen is interrupt flood. |
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* |
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* There are at least two known causes. Firstly, on some boards, the |
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* I2CSerialBus resource index does not match the Interrupt resource, i.e. they |
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* are not one-to-one mapped like in the array below. Secondly, on some boards |
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* the IRQ line from the PD controller is not actually connected at all. But the |
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* interrupt flood is also seen on some boards where those are not a problem, so |
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* there are some other problems as well. |
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* |
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* Because of the issues with the interrupt, the device is disabled for now. If |
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* you wish to debug the issues, uncomment the below, and add an entry for the |
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* INT3515 device to the i2c_multi_instance_ids table. |
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* |
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* static const struct i2c_inst_data int3515_data[] = { |
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* { "tps6598x", IRQ_RESOURCE_APIC, 0 }, |
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* { "tps6598x", IRQ_RESOURCE_APIC, 1 }, |
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* { "tps6598x", IRQ_RESOURCE_APIC, 2 }, |
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* { "tps6598x", IRQ_RESOURCE_APIC, 3 }, |
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* { } |
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* }; |
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*/ |
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/* |
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* Note new device-ids must also be added to i2c_multi_instantiate_ids in |
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* drivers/acpi/scan.c: acpi_device_enumeration_by_parent(). |
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*/ |
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static const struct acpi_device_id i2c_multi_inst_acpi_ids[] = { |
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{ "BSG1160", (unsigned long)bsg1160_data }, |
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{ "BSG2150", (unsigned long)bsg2150_data }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(acpi, i2c_multi_inst_acpi_ids); |
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static struct platform_driver i2c_multi_inst_driver = { |
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.driver = { |
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.name = "I2C multi instantiate pseudo device driver", |
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.acpi_match_table = i2c_multi_inst_acpi_ids, |
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}, |
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.probe = i2c_multi_inst_probe, |
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.remove = i2c_multi_inst_remove, |
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}; |
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module_platform_driver(i2c_multi_inst_driver); |
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MODULE_DESCRIPTION("I2C multi instantiate pseudo device driver"); |
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MODULE_AUTHOR("Hans de Goede <[email protected]>"); |
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MODULE_LICENSE("GPL");
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