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Date: Thu, 25 Sep 2014 15:26:07 +0800
From: Lan Tianyu <tianyu.lan@...el.com>
To: Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org
CC: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Jean Delvare <jdelvare@...e.de>
Subject: Re: [PATCH v2] i2c: move acpi code back into the core
On 2014年09月25日 05:36, Wolfram Sang wrote:
> Commit 5d98e61d337c ("I2C/ACPI: Add i2c ACPI operation region support")
> renamed the i2c-core module. This may cause regressions for
> distributions, so put the ACPI code back into the core.
>
> Reported-by: Jean Delvare <jdelvare@...e.de>
> Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
> Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Cc: Lan Tianyu <tianyu.lan@...el.com>
> Cc: Jean Delvare <jdelvare@...e.de>
> ---
>
> v2: - make all acpi functions static
> - annotate #endif
> - remove declarations in i2c.h
> - add dummy functions to i2c-core.c
> - make two seperate #ifdef blocks instead of two nested ones
> (otherwise build errors due to no external decl. anymore)
>
> Mika, Lan, Jean: please test/review. I am still waiting for some testbot
> results, yet your audit is very wanted.
Hi Wolfram:
I have tested battery function and it worked normally with this patch.
Tested-by: Lan Tianyu <tianyu.lan@...el.com>
>
>
> MAINTAINERS | 1 -
> drivers/i2c/Makefile | 5 +-
> drivers/i2c/i2c-acpi.c | 364 -------------------------------------------------
> drivers/i2c/i2c-core.c | 354 +++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/i2c.h | 16 ---
> 5 files changed, 355 insertions(+), 385 deletions(-)
> delete mode 100644 drivers/i2c/i2c-acpi.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 809ecd680d88..e3682d0dea1e 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4477,7 +4477,6 @@ M: Mika Westerberg <mika.westerberg@...ux.intel.com>
> L: linux-i2c@...r.kernel.org
> L: linux-acpi@...r.kernel.org
> S: Maintained
> -F: drivers/i2c/i2c-acpi.c
>
> I2C-TAOS-EVM DRIVER
> M: Jean Delvare <jdelvare@...e.de>
> diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
> index e0228b228256..1722f50f2473 100644
> --- a/drivers/i2c/Makefile
> +++ b/drivers/i2c/Makefile
> @@ -2,11 +2,8 @@
> # Makefile for the i2c core.
> #
>
> -i2ccore-y := i2c-core.o
> -i2ccore-$(CONFIG_ACPI) += i2c-acpi.o
> -
> obj-$(CONFIG_I2C_BOARDINFO) += i2c-boardinfo.o
> -obj-$(CONFIG_I2C) += i2ccore.o
> +obj-$(CONFIG_I2C) += i2c-core.o
> obj-$(CONFIG_I2C_SMBUS) += i2c-smbus.o
> obj-$(CONFIG_I2C_CHARDEV) += i2c-dev.o
> obj-$(CONFIG_I2C_MUX) += i2c-mux.o
> diff --git a/drivers/i2c/i2c-acpi.c b/drivers/i2c/i2c-acpi.c
> deleted file mode 100644
> index 0dbc18c15c43..000000000000
> --- a/drivers/i2c/i2c-acpi.c
> +++ /dev/null
> @@ -1,364 +0,0 @@
> -/*
> - * I2C ACPI code
> - *
> - * Copyright (C) 2014 Intel Corp
> - *
> - * Author: Lan Tianyu <tianyu.lan@...el.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
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index 632057a44615..b696ac7e6d86 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -27,6 +27,8 @@
> OF support is copyright (c) 2008 Jochen Friedrich <jochen@...am.de>
> (based on a previous patch from Jon Smirl <jonsmirl@...il.com>) and
> (c) 2013 Wolfram Sang <wsa@...-dreams.de>
> + I2C ACPI code Copyright (C) 2014 Intel Corp
> + Author: Lan Tianyu <tianyu.lan@...el.com>
> */
>
> #include <linux/module.h>
> @@ -78,6 +80,358 @@ void i2c_transfer_trace_unreg(void)
> static_key_slow_dec(&i2c_trace_msg);
> }
>
> +#if defined(CONFIG_ACPI)
> +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.
> + */
> +static 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");
> +}
> +
> +#else /* CONFIG_ACPI */
> +static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) { }
> +#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
> +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;
> +}
> +
> +
> +static 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;
> +}
> +
> +static 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);
> +}
> +#else /* CONFIG_ACPI_I2C_OPREGION */
> +static inline void acpi_i2c_remove_space_handler(struct i2c_adapter *adapter)
> +{ }
> +
> +static inline int acpi_i2c_install_space_handler(struct i2c_adapter *adapter)
> +{ return 0; }
> +#endif /* CONFIG_ACPI_I2C_OPREGION */
> +
> /* ------------------------------------------------------------------------- */
>
> static const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
> diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> index a95efeb53a8b..b556e0ab946f 100644
> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -577,20 +577,4 @@ static inline struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node
> }
> #endif /* CONFIG_OF */
>
> -#ifdef CONFIG_ACPI
> -void acpi_i2c_register_devices(struct i2c_adapter *adap);
> -#else
> -static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) { }
> -#endif /* CONFIG_ACPI */
> -
> -#ifdef CONFIG_ACPI_I2C_OPREGION
> -int acpi_i2c_install_space_handler(struct i2c_adapter *adapter);
> -void acpi_i2c_remove_space_handler(struct i2c_adapter *adapter);
> -#else
> -static inline void acpi_i2c_remove_space_handler(struct i2c_adapter *adapter)
> -{ }
> -static inline int acpi_i2c_install_space_handler(struct i2c_adapter *adapter)
> -{ return 0; }
> -#endif /* CONFIG_ACPI_I2C_OPREGION */
> -
> #endif /* _LINUX_I2C_H */
>
--
Best regards
Tianyu Lan
--
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