i2c: break out ACPI support into separate file
Removes some ifdeffery. Also add the new file to the relevant MAINTAINERS section. Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
parent
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commit
53f8f7c5cf
@ -6273,6 +6273,7 @@ M: Mika Westerberg <mika.westerberg@linux.intel.com>
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L: linux-i2c@vger.kernel.org
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L: linux-i2c@vger.kernel.org
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L: linux-acpi@vger.kernel.org
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L: linux-acpi@vger.kernel.org
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S: Maintained
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S: Maintained
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F: drivers/i2c/i2c-core-acpi.c
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I2C-TAOS-EVM DRIVER
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I2C-TAOS-EVM DRIVER
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M: Jean Delvare <jdelvare@suse.com>
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M: Jean Delvare <jdelvare@suse.com>
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@ -5,6 +5,7 @@
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obj-$(CONFIG_I2C_BOARDINFO) += i2c-boardinfo.o
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obj-$(CONFIG_I2C_BOARDINFO) += i2c-boardinfo.o
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obj-$(CONFIG_I2C) += i2c-core.o
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obj-$(CONFIG_I2C) += i2c-core.o
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i2c-core-objs := i2c-core-base.o i2c-core-smbus.o
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i2c-core-objs := i2c-core-base.o i2c-core-smbus.o
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i2c-core-$(CONFIG_ACPI) += i2c-core-acpi.o
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i2c-core-$(CONFIG_I2C_SLAVE) += i2c-core-slave.o
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i2c-core-$(CONFIG_I2C_SLAVE) += i2c-core-slave.o
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i2c-core-$(CONFIG_OF) += i2c-core-of.o
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i2c-core-$(CONFIG_OF) += i2c-core-of.o
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653
drivers/i2c/i2c-core-acpi.c
Normal file
653
drivers/i2c/i2c-core-acpi.c
Normal file
@ -0,0 +1,653 @@
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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 <tianyu.lan@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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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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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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};
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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 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
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return 1;
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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 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_SUCCESS(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 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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acpi_device_enumerated(adev))
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return -EINVAL;
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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_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 list_head resource_list;
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struct resource_entry *entry;
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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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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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/* Then fill IRQ number if any */
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INIT_LIST_HEAD(&resource_list);
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ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
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if (ret < 0)
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return -EINVAL;
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resource_list_for_each_entry(entry, &resource_list) {
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if (resource_type(entry->res) == IORESOURCE_IRQ) {
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info->irq = entry->res->start;
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break;
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}
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}
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acpi_dev_free_resource_list(&resource_list);
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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 (!i2c_new_device(adapter, info)) {
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adev->power.flags.ignore_parent = false;
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dev_err(&adapter->dev,
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"failed to add I2C device %s from ACPI\n",
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dev_name(&adev->dev));
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}
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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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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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}
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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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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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return lookup.min_speed != UINT_MAX ? lookup.min_speed : 0;
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}
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EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);
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static int i2c_acpi_match_adapter(struct device *dev, 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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static int i2c_acpi_match_device(struct device *dev, void *data)
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{
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return ACPI_COMPANION(dev) == data;
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}
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static 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_match_adapter);
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return dev ? i2c_verify_adapter(dev) : NULL;
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}
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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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dev = bus_find_device(&i2c_bus_type, NULL, adev, i2c_acpi_match_device);
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return dev ? i2c_verify_client(dev) : NULL;
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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)
|
||||||
|
* Context: can sleep
|
||||||
|
*
|
||||||
|
* By default the i2c subsys creates an i2c-client for the first I2cSerialBus
|
||||||
|
* resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus
|
||||||
|
* resources, in that case this function can be used to create an i2c-client
|
||||||
|
* for other I2cSerialBus resources in the Current Resource Settings table.
|
||||||
|
*
|
||||||
|
* Also see i2c_new_device, which this function calls to create the i2c-client.
|
||||||
|
*
|
||||||
|
* Returns a pointer to the new i2c-client, or NULL if the adapter is not found.
|
||||||
|
*/
|
||||||
|
struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
|
||||||
|
struct i2c_board_info *info)
|
||||||
|
{
|
||||||
|
struct i2c_acpi_lookup lookup;
|
||||||
|
struct i2c_adapter *adapter;
|
||||||
|
struct acpi_device *adev;
|
||||||
|
LIST_HEAD(resource_list);
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
adev = ACPI_COMPANION(dev);
|
||||||
|
if (!adev)
|
||||||
|
return NULL;
|
||||||
|
|
||||||
|
memset(&lookup, 0, sizeof(lookup));
|
||||||
|
lookup.info = info;
|
||||||
|
lookup.device_handle = acpi_device_handle(adev);
|
||||||
|
lookup.index = index;
|
||||||
|
|
||||||
|
ret = acpi_dev_get_resources(adev, &resource_list,
|
||||||
|
i2c_acpi_fill_info, &lookup);
|
||||||
|
acpi_dev_free_resource_list(&resource_list);
|
||||||
|
|
||||||
|
if (ret < 0 || !info->addr)
|
||||||
|
return NULL;
|
||||||
|
|
||||||
|
adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle);
|
||||||
|
if (!adapter)
|
||||||
|
return NULL;
|
||||||
|
|
||||||
|
return i2c_new_device(adapter, info);
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(i2c_acpi_new_device);
|
||||||
|
|
||||||
|
#ifdef CONFIG_ACPI_I2C_OPREGION
|
||||||
|
static int acpi_gsb_i2c_read_bytes(struct i2c_client *client,
|
||||||
|
u8 cmd, u8 *data, u8 data_len)
|
||||||
|
{
|
||||||
|
|
||||||
|
struct i2c_msg msgs[2];
|
||||||
|
int ret;
|
||||||
|
u8 *buffer;
|
||||||
|
|
||||||
|
buffer = kzalloc(data_len, GFP_KERNEL);
|
||||||
|
if (!buffer)
|
||||||
|
return AE_NO_MEMORY;
|
||||||
|
|
||||||
|
msgs[0].addr = client->addr;
|
||||||
|
msgs[0].flags = client->flags;
|
||||||
|
msgs[0].len = 1;
|
||||||
|
msgs[0].buf = &cmd;
|
||||||
|
|
||||||
|
msgs[1].addr = client->addr;
|
||||||
|
msgs[1].flags = client->flags | I2C_M_RD;
|
||||||
|
msgs[1].len = data_len;
|
||||||
|
msgs[1].buf = buffer;
|
||||||
|
|
||||||
|
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
|
||||||
|
if (ret < 0)
|
||||||
|
dev_err(&client->adapter->dev, "i2c read failed\n");
|
||||||
|
else
|
||||||
|
memcpy(data, buffer, data_len);
|
||||||
|
|
||||||
|
kfree(buffer);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int acpi_gsb_i2c_write_bytes(struct i2c_client *client,
|
||||||
|
u8 cmd, u8 *data, u8 data_len)
|
||||||
|
{
|
||||||
|
|
||||||
|
struct i2c_msg msgs[1];
|
||||||
|
u8 *buffer;
|
||||||
|
int ret = AE_OK;
|
||||||
|
|
||||||
|
buffer = kzalloc(data_len + 1, GFP_KERNEL);
|
||||||
|
if (!buffer)
|
||||||
|
return AE_NO_MEMORY;
|
||||||
|
|
||||||
|
buffer[0] = cmd;
|
||||||
|
memcpy(buffer + 1, data, data_len);
|
||||||
|
|
||||||
|
msgs[0].addr = client->addr;
|
||||||
|
msgs[0].flags = client->flags;
|
||||||
|
msgs[0].len = data_len + 1;
|
||||||
|
msgs[0].buf = buffer;
|
||||||
|
|
||||||
|
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
|
||||||
|
if (ret < 0)
|
||||||
|
dev_err(&client->adapter->dev, "i2c write failed\n");
|
||||||
|
|
||||||
|
kfree(buffer);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
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 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) {
|
||||||
|
ret = AE_BAD_PARAMETER;
|
||||||
|
goto err;
|
||||||
|
}
|
||||||
|
|
||||||
|
sb = &ares->data.i2c_serial_bus;
|
||||||
|
if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) {
|
||||||
|
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);
|
||||||
|
if (status > 0)
|
||||||
|
status = 0;
|
||||||
|
} 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;
|
||||||
|
}
|
||||||
|
|
||||||
|
acpi_walk_dep_device_list(handle);
|
||||||
|
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 */
|
@ -16,8 +16,6 @@
|
|||||||
/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi>.
|
/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi>.
|
||||||
Mux support by Rodolfo Giometti <giometti@enneenne.com> and
|
Mux support by Rodolfo Giometti <giometti@enneenne.com> and
|
||||||
Michael Lawnick <michael.lawnick.ext@nsn.com>
|
Michael Lawnick <michael.lawnick.ext@nsn.com>
|
||||||
I2C ACPI code Copyright (C) 2014 Intel Corp
|
|
||||||
Author: Lan Tianyu <tianyu.lan@intel.com>
|
|
||||||
*/
|
*/
|
||||||
|
|
||||||
#define pr_fmt(fmt) "i2c-core: " fmt
|
#define pr_fmt(fmt) "i2c-core: " fmt
|
||||||
@ -83,652 +81,6 @@ void i2c_transfer_trace_unreg(void)
|
|||||||
static_key_slow_dec(&i2c_trace_msg);
|
static_key_slow_dec(&i2c_trace_msg);
|
||||||
}
|
}
|
||||||
|
|
||||||
#if defined(CONFIG_ACPI)
|
|
||||||
struct i2c_acpi_handler_data {
|
|
||||||
struct acpi_connection_info info;
|
|
||||||
struct i2c_adapter *adapter;
|
|
||||||
};
|
|
||||||
|
|
||||||
struct gsb_buffer {
|
|
||||||
u8 status;
|
|
||||||
u8 len;
|
|
||||||
union {
|
|
||||||
u16 wdata;
|
|
||||||
u8 bdata;
|
|
||||||
u8 data[0];
|
|
||||||
};
|
|
||||||
} __packed;
|
|
||||||
|
|
||||||
struct i2c_acpi_lookup {
|
|
||||||
struct i2c_board_info *info;
|
|
||||||
acpi_handle adapter_handle;
|
|
||||||
acpi_handle device_handle;
|
|
||||||
acpi_handle search_handle;
|
|
||||||
int n;
|
|
||||||
int index;
|
|
||||||
u32 speed;
|
|
||||||
u32 min_speed;
|
|
||||||
};
|
|
||||||
|
|
||||||
static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data)
|
|
||||||
{
|
|
||||||
struct i2c_acpi_lookup *lookup = data;
|
|
||||||
struct i2c_board_info *info = lookup->info;
|
|
||||||
struct acpi_resource_i2c_serialbus *sb;
|
|
||||||
acpi_status status;
|
|
||||||
|
|
||||||
if (info->addr || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
|
|
||||||
return 1;
|
|
||||||
|
|
||||||
sb = &ares->data.i2c_serial_bus;
|
|
||||||
if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C)
|
|
||||||
return 1;
|
|
||||||
|
|
||||||
if (lookup->index != -1 && lookup->n++ != lookup->index)
|
|
||||||
return 1;
|
|
||||||
|
|
||||||
status = acpi_get_handle(lookup->device_handle,
|
|
||||||
sb->resource_source.string_ptr,
|
|
||||||
&lookup->adapter_handle);
|
|
||||||
if (!ACPI_SUCCESS(status))
|
|
||||||
return 1;
|
|
||||||
|
|
||||||
info->addr = sb->slave_address;
|
|
||||||
lookup->speed = sb->connection_speed;
|
|
||||||
if (sb->access_mode == ACPI_I2C_10BIT_MODE)
|
|
||||||
info->flags |= I2C_CLIENT_TEN;
|
|
||||||
|
|
||||||
return 1;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int i2c_acpi_do_lookup(struct acpi_device *adev,
|
|
||||||
struct i2c_acpi_lookup *lookup)
|
|
||||||
{
|
|
||||||
struct i2c_board_info *info = lookup->info;
|
|
||||||
struct list_head resource_list;
|
|
||||||
int ret;
|
|
||||||
|
|
||||||
if (acpi_bus_get_status(adev) || !adev->status.present ||
|
|
||||||
acpi_device_enumerated(adev))
|
|
||||||
return -EINVAL;
|
|
||||||
|
|
||||||
memset(info, 0, sizeof(*info));
|
|
||||||
lookup->device_handle = acpi_device_handle(adev);
|
|
||||||
|
|
||||||
/* Look up for I2cSerialBus resource */
|
|
||||||
INIT_LIST_HEAD(&resource_list);
|
|
||||||
ret = acpi_dev_get_resources(adev, &resource_list,
|
|
||||||
i2c_acpi_fill_info, lookup);
|
|
||||||
acpi_dev_free_resource_list(&resource_list);
|
|
||||||
|
|
||||||
if (ret < 0 || !info->addr)
|
|
||||||
return -EINVAL;
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int i2c_acpi_get_info(struct acpi_device *adev,
|
|
||||||
struct i2c_board_info *info,
|
|
||||||
struct i2c_adapter *adapter,
|
|
||||||
acpi_handle *adapter_handle)
|
|
||||||
{
|
|
||||||
struct list_head resource_list;
|
|
||||||
struct resource_entry *entry;
|
|
||||||
struct i2c_acpi_lookup lookup;
|
|
||||||
int ret;
|
|
||||||
|
|
||||||
memset(&lookup, 0, sizeof(lookup));
|
|
||||||
lookup.info = info;
|
|
||||||
lookup.index = -1;
|
|
||||||
|
|
||||||
ret = i2c_acpi_do_lookup(adev, &lookup);
|
|
||||||
if (ret)
|
|
||||||
return ret;
|
|
||||||
|
|
||||||
if (adapter) {
|
|
||||||
/* The adapter must match the one in I2cSerialBus() connector */
|
|
||||||
if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle)
|
|
||||||
return -ENODEV;
|
|
||||||
} else {
|
|
||||||
struct acpi_device *adapter_adev;
|
|
||||||
|
|
||||||
/* The adapter must be present */
|
|
||||||
if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev))
|
|
||||||
return -ENODEV;
|
|
||||||
if (acpi_bus_get_status(adapter_adev) ||
|
|
||||||
!adapter_adev->status.present)
|
|
||||||
return -ENODEV;
|
|
||||||
}
|
|
||||||
|
|
||||||
info->fwnode = acpi_fwnode_handle(adev);
|
|
||||||
if (adapter_handle)
|
|
||||||
*adapter_handle = lookup.adapter_handle;
|
|
||||||
|
|
||||||
/* Then fill IRQ number if any */
|
|
||||||
INIT_LIST_HEAD(&resource_list);
|
|
||||||
ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
|
|
||||||
if (ret < 0)
|
|
||||||
return -EINVAL;
|
|
||||||
|
|
||||||
resource_list_for_each_entry(entry, &resource_list) {
|
|
||||||
if (resource_type(entry->res) == IORESOURCE_IRQ) {
|
|
||||||
info->irq = entry->res->start;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
acpi_dev_free_resource_list(&resource_list);
|
|
||||||
|
|
||||||
acpi_set_modalias(adev, dev_name(&adev->dev), info->type,
|
|
||||||
sizeof(info->type));
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
static void i2c_acpi_register_device(struct i2c_adapter *adapter,
|
|
||||||
struct acpi_device *adev,
|
|
||||||
struct i2c_board_info *info)
|
|
||||||
{
|
|
||||||
adev->power.flags.ignore_parent = true;
|
|
||||||
acpi_device_set_enumerated(adev);
|
|
||||||
|
|
||||||
if (!i2c_new_device(adapter, info)) {
|
|
||||||
adev->power.flags.ignore_parent = false;
|
|
||||||
dev_err(&adapter->dev,
|
|
||||||
"failed to add I2C device %s from ACPI\n",
|
|
||||||
dev_name(&adev->dev));
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level,
|
|
||||||
void *data, void **return_value)
|
|
||||||
{
|
|
||||||
struct i2c_adapter *adapter = data;
|
|
||||||
struct acpi_device *adev;
|
|
||||||
struct i2c_board_info info;
|
|
||||||
|
|
||||||
if (acpi_bus_get_device(handle, &adev))
|
|
||||||
return AE_OK;
|
|
||||||
|
|
||||||
if (i2c_acpi_get_info(adev, &info, adapter, NULL))
|
|
||||||
return AE_OK;
|
|
||||||
|
|
||||||
i2c_acpi_register_device(adapter, adev, &info);
|
|
||||||
|
|
||||||
return AE_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
#define I2C_ACPI_MAX_SCAN_DEPTH 32
|
|
||||||
|
|
||||||
/**
|
|
||||||
* i2c_acpi_register_devices - enumerate I2C slave devices behind adapter
|
|
||||||
* @adap: pointer to adapter
|
|
||||||
*
|
|
||||||
* Enumerate all I2C slave devices behind this adapter by walking the ACPI
|
|
||||||
* namespace. When a device is found it will be added to the Linux device
|
|
||||||
* model and bound to the corresponding ACPI handle.
|
|
||||||
*/
|
|
||||||
static void i2c_acpi_register_devices(struct i2c_adapter *adap)
|
|
||||||
{
|
|
||||||
acpi_status status;
|
|
||||||
|
|
||||||
if (!has_acpi_companion(&adap->dev))
|
|
||||||
return;
|
|
||||||
|
|
||||||
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
||||||
I2C_ACPI_MAX_SCAN_DEPTH,
|
|
||||||
i2c_acpi_add_device, NULL,
|
|
||||||
adap, NULL);
|
|
||||||
if (ACPI_FAILURE(status))
|
|
||||||
dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
|
|
||||||
}
|
|
||||||
|
|
||||||
static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
|
|
||||||
void *data, void **return_value)
|
|
||||||
{
|
|
||||||
struct i2c_acpi_lookup *lookup = data;
|
|
||||||
struct acpi_device *adev;
|
|
||||||
|
|
||||||
if (acpi_bus_get_device(handle, &adev))
|
|
||||||
return AE_OK;
|
|
||||||
|
|
||||||
if (i2c_acpi_do_lookup(adev, lookup))
|
|
||||||
return AE_OK;
|
|
||||||
|
|
||||||
if (lookup->search_handle != lookup->adapter_handle)
|
|
||||||
return AE_OK;
|
|
||||||
|
|
||||||
if (lookup->speed <= lookup->min_speed)
|
|
||||||
lookup->min_speed = lookup->speed;
|
|
||||||
|
|
||||||
return AE_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* i2c_acpi_find_bus_speed - find I2C bus speed from ACPI
|
|
||||||
* @dev: The device owning the bus
|
|
||||||
*
|
|
||||||
* Find the I2C bus speed by walking the ACPI namespace for all I2C slaves
|
|
||||||
* devices connected to this bus and use the speed of slowest device.
|
|
||||||
*
|
|
||||||
* Returns the speed in Hz or zero
|
|
||||||
*/
|
|
||||||
u32 i2c_acpi_find_bus_speed(struct device *dev)
|
|
||||||
{
|
|
||||||
struct i2c_acpi_lookup lookup;
|
|
||||||
struct i2c_board_info dummy;
|
|
||||||
acpi_status status;
|
|
||||||
|
|
||||||
if (!has_acpi_companion(dev))
|
|
||||||
return 0;
|
|
||||||
|
|
||||||
memset(&lookup, 0, sizeof(lookup));
|
|
||||||
lookup.search_handle = ACPI_HANDLE(dev);
|
|
||||||
lookup.min_speed = UINT_MAX;
|
|
||||||
lookup.info = &dummy;
|
|
||||||
lookup.index = -1;
|
|
||||||
|
|
||||||
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
||||||
I2C_ACPI_MAX_SCAN_DEPTH,
|
|
||||||
i2c_acpi_lookup_speed, NULL,
|
|
||||||
&lookup, NULL);
|
|
||||||
|
|
||||||
if (ACPI_FAILURE(status)) {
|
|
||||||
dev_warn(dev, "unable to find I2C bus speed from ACPI\n");
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
return lookup.min_speed != UINT_MAX ? lookup.min_speed : 0;
|
|
||||||
}
|
|
||||||
EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);
|
|
||||||
|
|
||||||
static int i2c_acpi_match_adapter(struct device *dev, void *data)
|
|
||||||
{
|
|
||||||
struct i2c_adapter *adapter = i2c_verify_adapter(dev);
|
|
||||||
|
|
||||||
if (!adapter)
|
|
||||||
return 0;
|
|
||||||
|
|
||||||
return ACPI_HANDLE(dev) == (acpi_handle)data;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int i2c_acpi_match_device(struct device *dev, void *data)
|
|
||||||
{
|
|
||||||
return ACPI_COMPANION(dev) == data;
|
|
||||||
}
|
|
||||||
|
|
||||||
static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
|
|
||||||
{
|
|
||||||
struct device *dev;
|
|
||||||
|
|
||||||
dev = bus_find_device(&i2c_bus_type, NULL, handle,
|
|
||||||
i2c_acpi_match_adapter);
|
|
||||||
return dev ? i2c_verify_adapter(dev) : NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
|
|
||||||
{
|
|
||||||
struct device *dev;
|
|
||||||
|
|
||||||
dev = bus_find_device(&i2c_bus_type, NULL, adev, i2c_acpi_match_device);
|
|
||||||
return dev ? i2c_verify_client(dev) : NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value,
|
|
||||||
void *arg)
|
|
||||||
{
|
|
||||||
struct acpi_device *adev = arg;
|
|
||||||
struct i2c_board_info info;
|
|
||||||
acpi_handle adapter_handle;
|
|
||||||
struct i2c_adapter *adapter;
|
|
||||||
struct i2c_client *client;
|
|
||||||
|
|
||||||
switch (value) {
|
|
||||||
case ACPI_RECONFIG_DEVICE_ADD:
|
|
||||||
if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle))
|
|
||||||
break;
|
|
||||||
|
|
||||||
adapter = i2c_acpi_find_adapter_by_handle(adapter_handle);
|
|
||||||
if (!adapter)
|
|
||||||
break;
|
|
||||||
|
|
||||||
i2c_acpi_register_device(adapter, adev, &info);
|
|
||||||
break;
|
|
||||||
case ACPI_RECONFIG_DEVICE_REMOVE:
|
|
||||||
if (!acpi_device_enumerated(adev))
|
|
||||||
break;
|
|
||||||
|
|
||||||
client = i2c_acpi_find_client_by_adev(adev);
|
|
||||||
if (!client)
|
|
||||||
break;
|
|
||||||
|
|
||||||
i2c_unregister_device(client);
|
|
||||||
put_device(&client->dev);
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
|
|
||||||
return NOTIFY_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
static struct notifier_block i2c_acpi_notifier = {
|
|
||||||
.notifier_call = i2c_acpi_notify,
|
|
||||||
};
|
|
||||||
|
|
||||||
/**
|
|
||||||
* i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource
|
|
||||||
* @dev: Device owning the ACPI resources to get the client from
|
|
||||||
* @index: Index of ACPI resource to get
|
|
||||||
* @info: describes the I2C device; note this is modified (addr gets set)
|
|
||||||
* Context: can sleep
|
|
||||||
*
|
|
||||||
* By default the i2c subsys creates an i2c-client for the first I2cSerialBus
|
|
||||||
* resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus
|
|
||||||
* resources, in that case this function can be used to create an i2c-client
|
|
||||||
* for other I2cSerialBus resources in the Current Resource Settings table.
|
|
||||||
*
|
|
||||||
* Also see i2c_new_device, which this function calls to create the i2c-client.
|
|
||||||
*
|
|
||||||
* Returns a pointer to the new i2c-client, or NULL if the adapter is not found.
|
|
||||||
*/
|
|
||||||
struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
|
|
||||||
struct i2c_board_info *info)
|
|
||||||
{
|
|
||||||
struct i2c_acpi_lookup lookup;
|
|
||||||
struct i2c_adapter *adapter;
|
|
||||||
struct acpi_device *adev;
|
|
||||||
LIST_HEAD(resource_list);
|
|
||||||
int ret;
|
|
||||||
|
|
||||||
adev = ACPI_COMPANION(dev);
|
|
||||||
if (!adev)
|
|
||||||
return NULL;
|
|
||||||
|
|
||||||
memset(&lookup, 0, sizeof(lookup));
|
|
||||||
lookup.info = info;
|
|
||||||
lookup.device_handle = acpi_device_handle(adev);
|
|
||||||
lookup.index = index;
|
|
||||||
|
|
||||||
ret = acpi_dev_get_resources(adev, &resource_list,
|
|
||||||
i2c_acpi_fill_info, &lookup);
|
|
||||||
acpi_dev_free_resource_list(&resource_list);
|
|
||||||
|
|
||||||
if (ret < 0 || !info->addr)
|
|
||||||
return NULL;
|
|
||||||
|
|
||||||
adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle);
|
|
||||||
if (!adapter)
|
|
||||||
return NULL;
|
|
||||||
|
|
||||||
return i2c_new_device(adapter, info);
|
|
||||||
}
|
|
||||||
EXPORT_SYMBOL_GPL(i2c_acpi_new_device);
|
|
||||||
#else /* CONFIG_ACPI */
|
|
||||||
static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
|
|
||||||
extern struct notifier_block i2c_acpi_notifier;
|
|
||||||
#endif /* CONFIG_ACPI */
|
|
||||||
|
|
||||||
#ifdef CONFIG_ACPI_I2C_OPREGION
|
|
||||||
static int acpi_gsb_i2c_read_bytes(struct i2c_client *client,
|
|
||||||
u8 cmd, u8 *data, u8 data_len)
|
|
||||||
{
|
|
||||||
|
|
||||||
struct i2c_msg msgs[2];
|
|
||||||
int ret;
|
|
||||||
u8 *buffer;
|
|
||||||
|
|
||||||
buffer = kzalloc(data_len, GFP_KERNEL);
|
|
||||||
if (!buffer)
|
|
||||||
return AE_NO_MEMORY;
|
|
||||||
|
|
||||||
msgs[0].addr = client->addr;
|
|
||||||
msgs[0].flags = client->flags;
|
|
||||||
msgs[0].len = 1;
|
|
||||||
msgs[0].buf = &cmd;
|
|
||||||
|
|
||||||
msgs[1].addr = client->addr;
|
|
||||||
msgs[1].flags = client->flags | I2C_M_RD;
|
|
||||||
msgs[1].len = data_len;
|
|
||||||
msgs[1].buf = buffer;
|
|
||||||
|
|
||||||
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
|
|
||||||
if (ret < 0)
|
|
||||||
dev_err(&client->adapter->dev, "i2c read failed\n");
|
|
||||||
else
|
|
||||||
memcpy(data, buffer, data_len);
|
|
||||||
|
|
||||||
kfree(buffer);
|
|
||||||
return ret;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int acpi_gsb_i2c_write_bytes(struct i2c_client *client,
|
|
||||||
u8 cmd, u8 *data, u8 data_len)
|
|
||||||
{
|
|
||||||
|
|
||||||
struct i2c_msg msgs[1];
|
|
||||||
u8 *buffer;
|
|
||||||
int ret = AE_OK;
|
|
||||||
|
|
||||||
buffer = kzalloc(data_len + 1, GFP_KERNEL);
|
|
||||||
if (!buffer)
|
|
||||||
return AE_NO_MEMORY;
|
|
||||||
|
|
||||||
buffer[0] = cmd;
|
|
||||||
memcpy(buffer + 1, data, data_len);
|
|
||||||
|
|
||||||
msgs[0].addr = client->addr;
|
|
||||||
msgs[0].flags = client->flags;
|
|
||||||
msgs[0].len = data_len + 1;
|
|
||||||
msgs[0].buf = buffer;
|
|
||||||
|
|
||||||
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
|
|
||||||
if (ret < 0)
|
|
||||||
dev_err(&client->adapter->dev, "i2c write failed\n");
|
|
||||||
|
|
||||||
kfree(buffer);
|
|
||||||
return ret;
|
|
||||||
}
|
|
||||||
|
|
||||||
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 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) {
|
|
||||||
ret = AE_BAD_PARAMETER;
|
|
||||||
goto err;
|
|
||||||
}
|
|
||||||
|
|
||||||
sb = &ares->data.i2c_serial_bus;
|
|
||||||
if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) {
|
|
||||||
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);
|
|
||||||
if (status > 0)
|
|
||||||
status = 0;
|
|
||||||
} 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;
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
static 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;
|
|
||||||
}
|
|
||||||
|
|
||||||
acpi_walk_dep_device_list(handle);
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
static 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);
|
|
||||||
}
|
|
||||||
#else /* CONFIG_ACPI_I2C_OPREGION */
|
|
||||||
static inline void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter)
|
|
||||||
{ }
|
|
||||||
|
|
||||||
static inline int i2c_acpi_install_space_handler(struct i2c_adapter *adapter)
|
|
||||||
{ return 0; }
|
|
||||||
#endif /* CONFIG_ACPI_I2C_OPREGION */
|
|
||||||
|
|
||||||
/* ------------------------------------------------------------------------- */
|
|
||||||
|
|
||||||
const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
|
const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
|
||||||
const struct i2c_client *client)
|
const struct i2c_client *client)
|
||||||
{
|
{
|
||||||
|
@ -30,6 +30,21 @@ extern int __i2c_first_dynamic_bus_num;
|
|||||||
int i2c_check_addr_validity(unsigned addr, unsigned short flags);
|
int i2c_check_addr_validity(unsigned addr, unsigned short flags);
|
||||||
int i2c_check_7bit_addr_validity_strict(unsigned short addr);
|
int i2c_check_7bit_addr_validity_strict(unsigned short addr);
|
||||||
|
|
||||||
|
#ifdef CONFIG_ACPI
|
||||||
|
void i2c_acpi_register_devices(struct i2c_adapter *adap);
|
||||||
|
#else /* CONFIG_ACPI */
|
||||||
|
static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
|
||||||
|
#endif /* CONFIG_ACPI */
|
||||||
|
extern struct notifier_block i2c_acpi_notifier;
|
||||||
|
|
||||||
|
#ifdef CONFIG_ACPI_I2C_OPREGION
|
||||||
|
int i2c_acpi_install_space_handler(struct i2c_adapter *adapter);
|
||||||
|
void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter);
|
||||||
|
#else /* CONFIG_ACPI_I2C_OPREGION */
|
||||||
|
static inline int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) { return 0; }
|
||||||
|
static inline void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) { }
|
||||||
|
#endif /* CONFIG_ACPI_I2C_OPREGION */
|
||||||
|
|
||||||
#ifdef CONFIG_OF
|
#ifdef CONFIG_OF
|
||||||
void of_i2c_register_devices(struct i2c_adapter *adap);
|
void of_i2c_register_devices(struct i2c_adapter *adap);
|
||||||
#else
|
#else
|
||||||
|
Loading…
Reference in New Issue
Block a user