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755 lines
18 KiB
755 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Linux I2C core ACPI support code |
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* |
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* Copyright (C) 2014 Intel Corp, Author: Lan Tianyu <[email protected]> |
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*/ |
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|
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#include <linux/acpi.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/i2c.h> |
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#include <linux/list.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include "i2c-core.h" |
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struct i2c_acpi_handler_data { |
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struct acpi_connection_info info; |
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struct i2c_adapter *adapter; |
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}; |
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|
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struct gsb_buffer { |
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u8 status; |
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u8 len; |
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union { |
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u16 wdata; |
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u8 bdata; |
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u8 data[0]; |
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}; |
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} __packed; |
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struct i2c_acpi_lookup { |
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struct i2c_board_info *info; |
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acpi_handle adapter_handle; |
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acpi_handle device_handle; |
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acpi_handle search_handle; |
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int n; |
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int index; |
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u32 speed; |
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u32 min_speed; |
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u32 force_speed; |
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}; |
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/** |
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* i2c_acpi_get_i2c_resource - Gets I2cSerialBus resource if type matches |
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* @ares: ACPI resource |
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* @i2c: Pointer to I2cSerialBus resource will be returned here |
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* |
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* Checks if the given ACPI resource is of type I2cSerialBus. |
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* In this case, returns a pointer to it to the caller. |
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* |
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* Returns true if resource type is of I2cSerialBus, otherwise false. |
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*/ |
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bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, |
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struct acpi_resource_i2c_serialbus **i2c) |
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{ |
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struct acpi_resource_i2c_serialbus *sb; |
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if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) |
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return false; |
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sb = &ares->data.i2c_serial_bus; |
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if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) |
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return false; |
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*i2c = sb; |
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return true; |
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} |
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EXPORT_SYMBOL_GPL(i2c_acpi_get_i2c_resource); |
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static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) |
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{ |
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struct i2c_acpi_lookup *lookup = data; |
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struct i2c_board_info *info = lookup->info; |
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struct acpi_resource_i2c_serialbus *sb; |
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acpi_status status; |
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if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb)) |
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return 1; |
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if (lookup->index != -1 && lookup->n++ != lookup->index) |
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return 1; |
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status = acpi_get_handle(lookup->device_handle, |
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sb->resource_source.string_ptr, |
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&lookup->adapter_handle); |
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if (ACPI_FAILURE(status)) |
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return 1; |
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info->addr = sb->slave_address; |
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lookup->speed = sb->connection_speed; |
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if (sb->access_mode == ACPI_I2C_10BIT_MODE) |
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info->flags |= I2C_CLIENT_TEN; |
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return 1; |
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} |
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static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = { |
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/* |
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* ACPI video acpi_devices, which are handled by the acpi-video driver |
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* sometimes contain a SERIAL_TYPE_I2C ACPI resource, ignore these. |
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*/ |
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{ ACPI_VIDEO_HID, 0 }, |
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{} |
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}; |
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static int i2c_acpi_do_lookup(struct acpi_device *adev, |
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struct i2c_acpi_lookup *lookup) |
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{ |
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struct i2c_board_info *info = lookup->info; |
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struct list_head resource_list; |
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int ret; |
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if (acpi_bus_get_status(adev) || !adev->status.present) |
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return -EINVAL; |
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if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0) |
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return -ENODEV; |
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memset(info, 0, sizeof(*info)); |
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lookup->device_handle = acpi_device_handle(adev); |
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/* Look up for I2cSerialBus resource */ |
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INIT_LIST_HEAD(&resource_list); |
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ret = acpi_dev_get_resources(adev, &resource_list, |
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i2c_acpi_fill_info, lookup); |
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acpi_dev_free_resource_list(&resource_list); |
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if (ret < 0 || !info->addr) |
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return -EINVAL; |
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return 0; |
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} |
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static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data) |
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{ |
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int *irq = data; |
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struct resource r; |
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if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r)) |
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*irq = i2c_dev_irq_from_resources(&r, 1); |
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return 1; /* No need to add resource to the list */ |
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} |
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/** |
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* i2c_acpi_get_irq - get device IRQ number from ACPI |
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* @client: Pointer to the I2C client device |
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* |
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* Find the IRQ number used by a specific client device. |
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* |
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* Return: The IRQ number or an error code. |
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*/ |
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int i2c_acpi_get_irq(struct i2c_client *client) |
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{ |
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struct acpi_device *adev = ACPI_COMPANION(&client->dev); |
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struct list_head resource_list; |
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int irq = -ENOENT; |
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int ret; |
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INIT_LIST_HEAD(&resource_list); |
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ret = acpi_dev_get_resources(adev, &resource_list, |
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i2c_acpi_add_resource, &irq); |
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if (ret < 0) |
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return ret; |
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acpi_dev_free_resource_list(&resource_list); |
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if (irq == -ENOENT) |
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irq = acpi_dev_gpio_irq_get(adev, 0); |
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return irq; |
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} |
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static int i2c_acpi_get_info(struct acpi_device *adev, |
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struct i2c_board_info *info, |
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struct i2c_adapter *adapter, |
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acpi_handle *adapter_handle) |
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{ |
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struct i2c_acpi_lookup lookup; |
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int ret; |
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memset(&lookup, 0, sizeof(lookup)); |
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lookup.info = info; |
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lookup.index = -1; |
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if (acpi_device_enumerated(adev)) |
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return -EINVAL; |
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ret = i2c_acpi_do_lookup(adev, &lookup); |
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if (ret) |
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return ret; |
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if (adapter) { |
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/* The adapter must match the one in I2cSerialBus() connector */ |
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if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle) |
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return -ENODEV; |
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} else { |
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struct acpi_device *adapter_adev; |
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/* The adapter must be present */ |
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if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev)) |
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return -ENODEV; |
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if (acpi_bus_get_status(adapter_adev) || |
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!adapter_adev->status.present) |
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return -ENODEV; |
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} |
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info->fwnode = acpi_fwnode_handle(adev); |
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if (adapter_handle) |
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*adapter_handle = lookup.adapter_handle; |
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acpi_set_modalias(adev, dev_name(&adev->dev), info->type, |
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sizeof(info->type)); |
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return 0; |
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} |
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static void i2c_acpi_register_device(struct i2c_adapter *adapter, |
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struct acpi_device *adev, |
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struct i2c_board_info *info) |
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{ |
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adev->power.flags.ignore_parent = true; |
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acpi_device_set_enumerated(adev); |
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if (IS_ERR(i2c_new_client_device(adapter, info))) |
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adev->power.flags.ignore_parent = false; |
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} |
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static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, |
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void *data, void **return_value) |
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{ |
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struct i2c_adapter *adapter = data; |
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struct acpi_device *adev; |
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struct i2c_board_info info; |
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if (acpi_bus_get_device(handle, &adev)) |
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return AE_OK; |
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if (i2c_acpi_get_info(adev, &info, adapter, NULL)) |
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return AE_OK; |
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i2c_acpi_register_device(adapter, adev, &info); |
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return AE_OK; |
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} |
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#define I2C_ACPI_MAX_SCAN_DEPTH 32 |
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/** |
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* i2c_acpi_register_devices - enumerate I2C slave devices behind adapter |
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* @adap: pointer to adapter |
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* |
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* Enumerate all I2C slave devices behind this adapter by walking the ACPI |
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* namespace. When a device is found it will be added to the Linux device |
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* model and bound to the corresponding ACPI handle. |
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*/ |
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void i2c_acpi_register_devices(struct i2c_adapter *adap) |
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{ |
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acpi_status status; |
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acpi_handle handle; |
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if (!has_acpi_companion(&adap->dev)) |
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return; |
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
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I2C_ACPI_MAX_SCAN_DEPTH, |
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i2c_acpi_add_device, NULL, |
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adap, NULL); |
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if (ACPI_FAILURE(status)) |
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dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); |
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if (!adap->dev.parent) |
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return; |
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handle = ACPI_HANDLE(adap->dev.parent); |
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if (!handle) |
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return; |
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acpi_walk_dep_device_list(handle); |
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} |
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static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = { |
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/* |
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* These Silead touchscreen controllers only work at 400KHz, for |
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* some reason they do not work at 100KHz. On some devices the ACPI |
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* tables list another device at their bus as only being capable |
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* of 100KHz, testing has shown that these other devices work fine |
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* at 400KHz (as can be expected of any recent i2c hw) so we force |
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* the speed of the bus to 400 KHz if a Silead device is present. |
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*/ |
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{ "MSSL1680", 0 }, |
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{} |
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}; |
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static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, |
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void *data, void **return_value) |
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{ |
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struct i2c_acpi_lookup *lookup = data; |
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struct acpi_device *adev; |
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if (acpi_bus_get_device(handle, &adev)) |
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return AE_OK; |
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if (i2c_acpi_do_lookup(adev, lookup)) |
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return AE_OK; |
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if (lookup->search_handle != lookup->adapter_handle) |
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return AE_OK; |
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if (lookup->speed <= lookup->min_speed) |
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lookup->min_speed = lookup->speed; |
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if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0) |
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lookup->force_speed = I2C_MAX_FAST_MODE_FREQ; |
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return AE_OK; |
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} |
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/** |
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* i2c_acpi_find_bus_speed - find I2C bus speed from ACPI |
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* @dev: The device owning the bus |
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* |
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* Find the I2C bus speed by walking the ACPI namespace for all I2C slaves |
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* devices connected to this bus and use the speed of slowest device. |
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* |
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* Returns the speed in Hz or zero |
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*/ |
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u32 i2c_acpi_find_bus_speed(struct device *dev) |
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{ |
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struct i2c_acpi_lookup lookup; |
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struct i2c_board_info dummy; |
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acpi_status status; |
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if (!has_acpi_companion(dev)) |
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return 0; |
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memset(&lookup, 0, sizeof(lookup)); |
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lookup.search_handle = ACPI_HANDLE(dev); |
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lookup.min_speed = UINT_MAX; |
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lookup.info = &dummy; |
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lookup.index = -1; |
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
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I2C_ACPI_MAX_SCAN_DEPTH, |
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i2c_acpi_lookup_speed, NULL, |
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&lookup, NULL); |
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if (ACPI_FAILURE(status)) { |
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dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); |
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return 0; |
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} |
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if (lookup.force_speed) { |
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if (lookup.force_speed != lookup.min_speed) |
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dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n", |
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lookup.min_speed, lookup.force_speed); |
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return lookup.force_speed; |
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} else if (lookup.min_speed != UINT_MAX) { |
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return lookup.min_speed; |
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} else { |
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return 0; |
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} |
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} |
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EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); |
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static int i2c_acpi_find_match_adapter(struct device *dev, const void *data) |
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{ |
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struct i2c_adapter *adapter = i2c_verify_adapter(dev); |
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if (!adapter) |
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return 0; |
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return ACPI_HANDLE(dev) == (acpi_handle)data; |
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} |
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struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) |
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{ |
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struct device *dev; |
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dev = bus_find_device(&i2c_bus_type, NULL, handle, |
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i2c_acpi_find_match_adapter); |
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return dev ? i2c_verify_adapter(dev) : NULL; |
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} |
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EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle); |
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static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) |
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{ |
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struct device *dev; |
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struct i2c_client *client; |
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dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev); |
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if (!dev) |
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return NULL; |
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client = i2c_verify_client(dev); |
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if (!client) |
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put_device(dev); |
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return client; |
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} |
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static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, |
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void *arg) |
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{ |
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struct acpi_device *adev = arg; |
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struct i2c_board_info info; |
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acpi_handle adapter_handle; |
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struct i2c_adapter *adapter; |
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struct i2c_client *client; |
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switch (value) { |
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case ACPI_RECONFIG_DEVICE_ADD: |
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if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) |
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break; |
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adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); |
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if (!adapter) |
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break; |
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i2c_acpi_register_device(adapter, adev, &info); |
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break; |
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case ACPI_RECONFIG_DEVICE_REMOVE: |
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if (!acpi_device_enumerated(adev)) |
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break; |
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client = i2c_acpi_find_client_by_adev(adev); |
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if (!client) |
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break; |
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i2c_unregister_device(client); |
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put_device(&client->dev); |
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break; |
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} |
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return NOTIFY_OK; |
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} |
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struct notifier_block i2c_acpi_notifier = { |
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.notifier_call = i2c_acpi_notify, |
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}; |
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/** |
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* i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource |
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* @dev: Device owning the ACPI resources to get the client from |
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* @index: Index of ACPI resource to get |
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* @info: describes the I2C device; note this is modified (addr gets set) |
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* Context: can sleep |
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* |
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* By default the i2c subsys creates an i2c-client for the first I2cSerialBus |
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* resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus |
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* resources, in that case this function can be used to create an i2c-client |
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* for other I2cSerialBus resources in the Current Resource Settings table. |
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* |
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* Also see i2c_new_client_device, which this function calls to create the |
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* i2c-client. |
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* |
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* Returns a pointer to the new i2c-client, or error pointer in case of failure. |
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* Specifically, -EPROBE_DEFER is returned if the adapter is not found. |
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*/ |
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struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, |
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struct i2c_board_info *info) |
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{ |
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struct acpi_device *adev = ACPI_COMPANION(dev); |
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struct i2c_acpi_lookup lookup; |
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struct i2c_adapter *adapter; |
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LIST_HEAD(resource_list); |
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int ret; |
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memset(&lookup, 0, sizeof(lookup)); |
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lookup.info = info; |
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lookup.device_handle = acpi_device_handle(adev); |
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lookup.index = index; |
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ret = acpi_dev_get_resources(adev, &resource_list, |
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i2c_acpi_fill_info, &lookup); |
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if (ret < 0) |
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return ERR_PTR(ret); |
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acpi_dev_free_resource_list(&resource_list); |
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if (!info->addr) |
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return ERR_PTR(-EADDRNOTAVAIL); |
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adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); |
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if (!adapter) |
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return ERR_PTR(-EPROBE_DEFER); |
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return i2c_new_client_device(adapter, info); |
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} |
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EXPORT_SYMBOL_GPL(i2c_acpi_new_device); |
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#ifdef CONFIG_ACPI_I2C_OPREGION |
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static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, |
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u8 cmd, u8 *data, u8 data_len) |
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{ |
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struct i2c_msg msgs[2]; |
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int ret; |
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u8 *buffer; |
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buffer = kzalloc(data_len, GFP_KERNEL); |
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if (!buffer) |
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return AE_NO_MEMORY; |
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msgs[0].addr = client->addr; |
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msgs[0].flags = client->flags; |
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msgs[0].len = 1; |
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msgs[0].buf = &cmd; |
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msgs[1].addr = client->addr; |
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msgs[1].flags = client->flags | I2C_M_RD; |
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msgs[1].len = data_len; |
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msgs[1].buf = buffer; |
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
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if (ret < 0) { |
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/* Getting a NACK is unfortunately normal with some DSTDs */ |
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if (ret == -EREMOTEIO) |
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dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", |
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data_len, client->addr, cmd, ret); |
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else |
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dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", |
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data_len, client->addr, cmd, ret); |
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/* 2 transfers must have completed successfully */ |
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} else if (ret == 2) { |
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memcpy(data, buffer, data_len); |
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ret = 0; |
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} else { |
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ret = -EIO; |
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} |
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kfree(buffer); |
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return ret; |
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} |
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static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, |
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u8 cmd, u8 *data, u8 data_len) |
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{ |
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|
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struct i2c_msg msgs[1]; |
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u8 *buffer; |
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int ret = AE_OK; |
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buffer = kzalloc(data_len + 1, GFP_KERNEL); |
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if (!buffer) |
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return AE_NO_MEMORY; |
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buffer[0] = cmd; |
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memcpy(buffer + 1, data, data_len); |
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msgs[0].addr = client->addr; |
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msgs[0].flags = client->flags; |
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msgs[0].len = data_len + 1; |
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msgs[0].buf = buffer; |
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
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|
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kfree(buffer); |
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if (ret < 0) { |
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dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret); |
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return ret; |
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} |
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/* 1 transfer must have completed successfully */ |
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return (ret == 1) ? 0 : -EIO; |
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} |
|
|
|
static acpi_status |
|
i2c_acpi_space_handler(u32 function, acpi_physical_address command, |
|
u32 bits, u64 *value64, |
|
void *handler_context, void *region_context) |
|
{ |
|
struct gsb_buffer *gsb = (struct gsb_buffer *)value64; |
|
struct i2c_acpi_handler_data *data = handler_context; |
|
struct acpi_connection_info *info = &data->info; |
|
struct acpi_resource_i2c_serialbus *sb; |
|
struct i2c_adapter *adapter = data->adapter; |
|
struct i2c_client *client; |
|
struct acpi_resource *ares; |
|
u32 accessor_type = function >> 16; |
|
u8 action = function & ACPI_IO_MASK; |
|
acpi_status ret; |
|
int status; |
|
|
|
ret = acpi_buffer_to_resource(info->connection, info->length, &ares); |
|
if (ACPI_FAILURE(ret)) |
|
return ret; |
|
|
|
client = kzalloc(sizeof(*client), GFP_KERNEL); |
|
if (!client) { |
|
ret = AE_NO_MEMORY; |
|
goto err; |
|
} |
|
|
|
if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { |
|
ret = AE_BAD_PARAMETER; |
|
goto err; |
|
} |
|
|
|
client->adapter = adapter; |
|
client->addr = sb->slave_address; |
|
|
|
if (sb->access_mode == ACPI_I2C_10BIT_MODE) |
|
client->flags |= I2C_CLIENT_TEN; |
|
|
|
switch (accessor_type) { |
|
case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: |
|
if (action == ACPI_READ) { |
|
status = i2c_smbus_read_byte(client); |
|
if (status >= 0) { |
|
gsb->bdata = status; |
|
status = 0; |
|
} |
|
} else { |
|
status = i2c_smbus_write_byte(client, gsb->bdata); |
|
} |
|
break; |
|
|
|
case ACPI_GSB_ACCESS_ATTRIB_BYTE: |
|
if (action == ACPI_READ) { |
|
status = i2c_smbus_read_byte_data(client, command); |
|
if (status >= 0) { |
|
gsb->bdata = status; |
|
status = 0; |
|
} |
|
} else { |
|
status = i2c_smbus_write_byte_data(client, command, |
|
gsb->bdata); |
|
} |
|
break; |
|
|
|
case ACPI_GSB_ACCESS_ATTRIB_WORD: |
|
if (action == ACPI_READ) { |
|
status = i2c_smbus_read_word_data(client, command); |
|
if (status >= 0) { |
|
gsb->wdata = status; |
|
status = 0; |
|
} |
|
} else { |
|
status = i2c_smbus_write_word_data(client, command, |
|
gsb->wdata); |
|
} |
|
break; |
|
|
|
case ACPI_GSB_ACCESS_ATTRIB_BLOCK: |
|
if (action == ACPI_READ) { |
|
status = i2c_smbus_read_block_data(client, command, |
|
gsb->data); |
|
if (status >= 0) { |
|
gsb->len = status; |
|
status = 0; |
|
} |
|
} else { |
|
status = i2c_smbus_write_block_data(client, command, |
|
gsb->len, gsb->data); |
|
} |
|
break; |
|
|
|
case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: |
|
if (action == ACPI_READ) { |
|
status = acpi_gsb_i2c_read_bytes(client, command, |
|
gsb->data, info->access_length); |
|
} else { |
|
status = acpi_gsb_i2c_write_bytes(client, command, |
|
gsb->data, info->access_length); |
|
} |
|
break; |
|
|
|
default: |
|
dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", |
|
accessor_type, client->addr); |
|
ret = AE_BAD_PARAMETER; |
|
goto err; |
|
} |
|
|
|
gsb->status = status; |
|
|
|
err: |
|
kfree(client); |
|
ACPI_FREE(ares); |
|
return ret; |
|
} |
|
|
|
|
|
int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) |
|
{ |
|
acpi_handle handle; |
|
struct i2c_acpi_handler_data *data; |
|
acpi_status status; |
|
|
|
if (!adapter->dev.parent) |
|
return -ENODEV; |
|
|
|
handle = ACPI_HANDLE(adapter->dev.parent); |
|
|
|
if (!handle) |
|
return -ENODEV; |
|
|
|
data = kzalloc(sizeof(struct i2c_acpi_handler_data), |
|
GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
data->adapter = adapter; |
|
status = acpi_bus_attach_private_data(handle, (void *)data); |
|
if (ACPI_FAILURE(status)) { |
|
kfree(data); |
|
return -ENOMEM; |
|
} |
|
|
|
status = acpi_install_address_space_handler(handle, |
|
ACPI_ADR_SPACE_GSBUS, |
|
&i2c_acpi_space_handler, |
|
NULL, |
|
data); |
|
if (ACPI_FAILURE(status)) { |
|
dev_err(&adapter->dev, "Error installing i2c space handler\n"); |
|
acpi_bus_detach_private_data(handle); |
|
kfree(data); |
|
return -ENOMEM; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) |
|
{ |
|
acpi_handle handle; |
|
struct i2c_acpi_handler_data *data; |
|
acpi_status status; |
|
|
|
if (!adapter->dev.parent) |
|
return; |
|
|
|
handle = ACPI_HANDLE(adapter->dev.parent); |
|
|
|
if (!handle) |
|
return; |
|
|
|
acpi_remove_address_space_handler(handle, |
|
ACPI_ADR_SPACE_GSBUS, |
|
&i2c_acpi_space_handler); |
|
|
|
status = acpi_bus_get_private_data(handle, (void **)&data); |
|
if (ACPI_SUCCESS(status)) |
|
kfree(data); |
|
|
|
acpi_bus_detach_private_data(handle); |
|
} |
|
#endif /* CONFIG_ACPI_I2C_OPREGION */
|
|
|