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@@ -0,0 +1,273 @@
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+/*
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+ * I2C ACPI code
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+ *
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+ * Copyright (C) 2014 Intel Corp
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+ *
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+ * 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
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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+ * for more details.
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+ */
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+#define pr_fmt(fmt) "I2C/ACPI : " fmt
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+
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+#include <linux/kernel.h>
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+#include <linux/errno.h>
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+#include <linux/err.h>
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+#include <linux/i2c.h>
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+#include <linux/acpi.h>
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+
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+struct acpi_i2c_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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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+ if (ret < 0)
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+ dev_err(&client->adapter->dev, "i2c read failed\n");
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+ else
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+ memcpy(data, buffer, data_len);
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+
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+ kfree(buffer);
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+ return ret;
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+}
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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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+
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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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+
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+ buffer[0] = cmd;
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+ memcpy(buffer + 1, data, data_len);
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+
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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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+
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+ ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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+ if (ret < 0)
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+ dev_err(&client->adapter->dev, "i2c write failed\n");
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+
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+ kfree(buffer);
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+ return ret;
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+}
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+
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+static acpi_status
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+acpi_i2c_space_handler(u32 function, acpi_physical_address command,
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+ u32 bits, u64 *value64,
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+ void *handler_context, void *region_context)
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+{
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+ struct gsb_buffer *gsb = (struct gsb_buffer *)value64;
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+ struct acpi_i2c_handler_data *data = handler_context;
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+ struct acpi_connection_info *info = &data->info;
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+ struct acpi_resource_i2c_serialbus *sb;
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+ struct i2c_adapter *adapter = data->adapter;
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+ struct i2c_client client;
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+ struct acpi_resource *ares;
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+ u32 accessor_type = function >> 16;
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+ u8 action = function & ACPI_IO_MASK;
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+ acpi_status ret = AE_OK;
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+ int status;
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+
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+ ret = acpi_buffer_to_resource(info->connection, info->length, &ares);
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+ if (ACPI_FAILURE(ret))
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+ return ret;
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+
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+ if (!value64 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) {
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+ ret = AE_BAD_PARAMETER;
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+ goto err;
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+ }
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+
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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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+ ret = AE_BAD_PARAMETER;
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+ goto err;
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+ }
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+
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+ memset(&client, 0, sizeof(client));
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+ client.adapter = adapter;
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+ client.addr = sb->slave_address;
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+ client.flags = 0;
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+
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+ if (sb->access_mode == ACPI_I2C_10BIT_MODE)
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+ client.flags |= I2C_CLIENT_TEN;
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+
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+ switch (accessor_type) {
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+ case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV:
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+ if (action == ACPI_READ) {
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+ status = i2c_smbus_read_byte(&client);
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+ if (status >= 0) {
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+ gsb->bdata = status;
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+ status = 0;
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+ }
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+ } else {
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+ status = i2c_smbus_write_byte(&client, gsb->bdata);
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+ }
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+ break;
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+
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+ case ACPI_GSB_ACCESS_ATTRIB_BYTE:
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+ if (action == ACPI_READ) {
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+ status = i2c_smbus_read_byte_data(&client, command);
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+ if (status >= 0) {
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+ gsb->bdata = status;
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+ status = 0;
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+ }
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+ } else {
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+ status = i2c_smbus_write_byte_data(&client, command,
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+ gsb->bdata);
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+ }
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+ break;
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+
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+ case ACPI_GSB_ACCESS_ATTRIB_WORD:
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+ if (action == ACPI_READ) {
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+ status = i2c_smbus_read_word_data(&client, command);
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+ if (status >= 0) {
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+ gsb->wdata = status;
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+ status = 0;
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+ }
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+ } else {
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+ status = i2c_smbus_write_word_data(&client, command,
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+ gsb->wdata);
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+ }
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+ break;
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+
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+ case ACPI_GSB_ACCESS_ATTRIB_BLOCK:
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+ if (action == ACPI_READ) {
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+ status = i2c_smbus_read_block_data(&client, command,
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+ gsb->data);
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+ if (status >= 0) {
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+ gsb->len = status;
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+ status = 0;
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+ }
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+ } else {
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+ status = i2c_smbus_write_block_data(&client, command,
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+ gsb->len, gsb->data);
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+ }
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+ break;
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+
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+ case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE:
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+ if (action == ACPI_READ) {
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+ status = acpi_gsb_i2c_read_bytes(&client, command,
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+ gsb->data, info->access_length);
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+ if (status > 0)
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+ status = 0;
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+ } else {
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+ status = acpi_gsb_i2c_write_bytes(&client, command,
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+ gsb->data, info->access_length);
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+ }
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+ break;
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+
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+ default:
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+ pr_info("protocol(0x%02x) is not supported.\n", accessor_type);
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+ ret = AE_BAD_PARAMETER;
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+ goto err;
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+ }
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+
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+ gsb->status = status;
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+
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+ err:
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+ ACPI_FREE(ares);
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+ return ret;
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+}
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+
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+
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+int acpi_i2c_install_space_handler(struct i2c_adapter *adapter)
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+{
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+ acpi_handle handle = ACPI_HANDLE(adapter->dev.parent);
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+ struct acpi_i2c_handler_data *data;
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+ acpi_status status;
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+
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+ if (!handle)
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+ return -ENODEV;
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+
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+ data = kzalloc(sizeof(struct acpi_i2c_handler_data),
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+ GFP_KERNEL);
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+ if (!data)
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+ return -ENOMEM;
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+
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+ data->adapter = adapter;
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+ status = acpi_bus_attach_private_data(handle, (void *)data);
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+ if (ACPI_FAILURE(status)) {
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+ kfree(data);
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+ return -ENOMEM;
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+ }
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+
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+ status = acpi_install_address_space_handler(handle,
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+ ACPI_ADR_SPACE_GSBUS,
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+ &acpi_i2c_space_handler,
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+ NULL,
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+ data);
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+ if (ACPI_FAILURE(status)) {
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+ dev_err(&adapter->dev, "Error installing i2c space handler\n");
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+ acpi_bus_detach_private_data(handle);
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+ kfree(data);
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+ return -ENOMEM;
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+ }
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+
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+ return 0;
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+}
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+
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+void acpi_i2c_remove_space_handler(struct i2c_adapter *adapter)
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+{
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+ acpi_handle handle = ACPI_HANDLE(adapter->dev.parent);
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+ struct acpi_i2c_handler_data *data;
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+ acpi_status status;
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+
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+ if (!handle)
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+ return;
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+
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+ acpi_remove_address_space_handler(handle,
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+ ACPI_ADR_SPACE_GSBUS,
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+ &acpi_i2c_space_handler);
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+
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+ status = acpi_bus_get_private_data(handle, (void **)&data);
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+ if (ACPI_SUCCESS(status))
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+ kfree(data);
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+
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+ acpi_bus_detach_private_data(handle);
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+}
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Lan Tianyu