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linux
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i2c-acpi.c
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i2c-acpi.c
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/* * I2C ACPI code * * Copyright (C) 2014 Intel Corp * * Author: Lan Tianyu <tianyu.lan@intel.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. */ #define pr_fmt(fmt) "I2C/ACPI : " fmt #include <linux/kernel.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/acpi.h> struct acpi_i2c_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; static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data) { struct i2c_board_info *info = data; if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { struct acpi_resource_i2c_serialbus *sb; sb = &ares->data.i2c_serial_bus; if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_I2C) { info->addr = sb->slave_address; if (sb->access_mode == ACPI_I2C_10BIT_MODE) info->flags |= I2C_CLIENT_TEN; } } else if (info->irq < 0) { struct resource r; if (acpi_dev_resource_interrupt(ares, 0, &r)) info->irq = r.start; } /* Tell the ACPI core to skip this resource */ return 1; } static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level, void *data, void **return_value) { struct i2c_adapter *adapter = data; struct list_head resource_list; struct i2c_board_info info; struct acpi_device *adev; int ret; if (acpi_bus_get_device(handle, &adev)) return AE_OK; if (acpi_bus_get_status(adev) || !adev->status.present) return AE_OK; memset(&info, 0, sizeof(info)); info.acpi_node.companion = adev; info.irq = -1; INIT_LIST_HEAD(&resource_list); ret = acpi_dev_get_resources(adev, &resource_list, acpi_i2c_add_resource, &info); acpi_dev_free_resource_list(&resource_list); if (ret < 0 || !info.addr) return AE_OK; adev->power.flags.ignore_parent = true; strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type)); 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)); } return AE_OK; } /** * acpi_i2c_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. */ void acpi_i2c_register_devices(struct i2c_adapter *adap) { acpi_handle handle; acpi_status status; if (!adap->dev.parent) return; handle = ACPI_HANDLE(adap->dev.parent); if (!handle) return; status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, acpi_i2c_add_device, NULL, adap, NULL); if (ACPI_FAILURE(status)) dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); } #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 acpi_i2c_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 acpi_i2c_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 = AE_OK; int status; ret = acpi_buffer_to_resource(info->connection, info->length, &ares); if (ACPI_FAILURE(ret)) return ret; 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; } memset(&client, 0, sizeof(client)); client.adapter = adapter; client.addr = sb->slave_address; client.flags = 0; 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: pr_info("protocol(0x%02x) is not supported.\n", accessor_type); ret = AE_BAD_PARAMETER; goto err; } gsb->status = status; err: ACPI_FREE(ares); return ret; } int acpi_i2c_install_space_handler(struct i2c_adapter *adapter) { acpi_handle handle = ACPI_HANDLE(adapter->dev.parent); struct acpi_i2c_handler_data *data; acpi_status status; if (!handle) return -ENODEV; data = kzalloc(sizeof(struct acpi_i2c_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, &acpi_i2c_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 acpi_i2c_remove_space_handler(struct i2c_adapter *adapter) { acpi_handle handle = ACPI_HANDLE(adapter->dev.parent); struct acpi_i2c_handler_data *data; acpi_status status; if (!handle) return; acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GSBUS, &acpi_i2c_space_handler); status = acpi_bus_get_private_data(handle, (void **)&data); if (ACPI_SUCCESS(status)) kfree(data); acpi_bus_detach_private_data(handle); } #endif
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