277 lines
5.7 KiB
C
277 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 MediaTek Inc.
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*/
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <soc/mediatek/emi.h>
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struct emi_isu {
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unsigned int buf_size;
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void __iomem *buf_addr;
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void __iomem *ver_addr;
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void __iomem *con_addr;
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unsigned int ctrl_intf;
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};
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/* global pointer for sysfs operations*/
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static struct emi_isu *global_emi_isu;
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static ssize_t emiisu_ctrl_show(struct device_driver *driver, char *buf)
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{
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struct emi_isu *isu;
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unsigned int state;
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if (!global_emi_isu)
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return 0;
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isu = global_emi_isu;
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if (!(isu->con_addr))
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return 0;
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state = readl(isu->con_addr);
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return snprintf(buf, PAGE_SIZE, "isu_state: 0x%x\n", state);
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}
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static ssize_t emiisu_ctrl_store
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(struct device_driver *driver, const char *buf, size_t count)
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{
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struct emi_isu *isu;
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unsigned long state;
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char *command;
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char *backup_command;
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char *ptr;
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char *token[MTK_EMI_MAX_TOKEN];
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int i;
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if (!global_emi_isu)
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return count;
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isu = global_emi_isu;
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if (!(isu->ctrl_intf))
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return count;
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if (!(isu->con_addr))
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return count;
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if ((strlen(buf) + 1) > MTK_EMI_MAX_CMD_LEN) {
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pr_info("%s: store command overflow\n", __func__);
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return count;
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}
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command = kmalloc((size_t)MTK_EMI_MAX_CMD_LEN, GFP_KERNEL);
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if (!command)
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return count;
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backup_command = command;
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strncpy(command, buf, (size_t)MTK_EMI_MAX_CMD_LEN);
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for (i = 0; i < MTK_EMI_MAX_TOKEN; i++) {
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ptr = strsep(&command, " ");
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if (!ptr)
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break;
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token[i] = ptr;
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}
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if (i < 1)
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goto emiisu_ctrl_store_end;
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if (kstrtoul(token[0], 16, &state) == 0)
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writel((unsigned int)state, isu->con_addr);
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emiisu_ctrl_store_end:
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kfree(backup_command);
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return count;
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}
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static DRIVER_ATTR_RW(emiisu_ctrl);
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static ssize_t read_emi_isu_buf(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buff, loff_t pos, size_t count)
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{
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struct emi_isu *isu;
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ssize_t bytes = 0, ret;
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if (!global_emi_isu)
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return 0;
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isu = global_emi_isu;
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if (!(isu->buf_addr))
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return 0;
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if (!(isu->ver_addr))
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return 0;
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/*
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* The EMI ISU buffer consists of a 4-byte header (which is stored in
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* isu->ver_addr) and the content (which is stored in isu->buf_addr).
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* Concatenate isu->ver_addr and isu->buf_addr and return to the reader.
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*/
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if (pos == 0) {
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if (count < 4)
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return -EINVAL;
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memcpy(buff, isu->ver_addr, 4);
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bytes += 4;
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buff += 4;
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count -= 4;
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pos += 4;
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}
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pos -= 4;
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ret = memory_read_from_buffer(buff, count, &pos,
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isu->buf_addr, isu->buf_size);
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if (ret < 0)
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return ret;
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else
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return bytes + ret;
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}
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static struct bin_attribute emi_isu_buf_attr = {
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.attr = {.name = "emi_isu_buf", .mode = 0444},
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.read = read_emi_isu_buf,
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};
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static const struct of_device_id emiisu_of_ids[] = {
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{.compatible = "mediatek,common-emiisu",},
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{}
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};
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static int emiisu_probe(struct platform_device *pdev)
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{
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struct device_node *emiisu_node = pdev->dev.of_node;
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struct emi_isu *isu;
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unsigned long long addr_temp;
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int ret;
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dev_info(&pdev->dev, "driver probed\n");
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isu = devm_kzalloc(&pdev->dev,
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sizeof(struct emi_isu), GFP_KERNEL);
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if (!isu)
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return -ENOMEM;
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ret = of_property_read_u32(emiisu_node,
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"buf_size", &(isu->buf_size));
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if (ret) {
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dev_err(&pdev->dev, "No buf_size\n");
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return -EINVAL;
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}
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ret = of_property_read_u64(emiisu_node, "buf_addr", &addr_temp);
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if (ret) {
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dev_err(&pdev->dev, "No buf_addr\n");
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return -EINVAL;
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}
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if (addr_temp)
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isu->buf_addr = ioremap_wc(
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(phys_addr_t)addr_temp, isu->buf_size);
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else
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isu->buf_addr = NULL;
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ret = of_property_read_u64(emiisu_node, "ver_addr", &addr_temp);
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if (ret) {
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dev_err(&pdev->dev, "No ver_addr\n");
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return -EINVAL;
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}
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if (addr_temp)
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isu->ver_addr = ioremap((phys_addr_t)addr_temp, 4);
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else
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isu->ver_addr = NULL;
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ret = of_property_read_u64(emiisu_node, "con_addr", &addr_temp);
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if (ret) {
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dev_err(&pdev->dev, "No con_addr\n");
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return -EINVAL;
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}
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if (addr_temp)
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isu->con_addr = ioremap((phys_addr_t)addr_temp, 4);
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else
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isu->con_addr = NULL;
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ret = of_property_read_u32(emiisu_node,
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"ctrl_intf", &(isu->ctrl_intf));
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if (ret) {
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dev_err(&pdev->dev, "No ctrl_intf\n");
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return -EINVAL;
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}
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/* max buffer size = ISU buffer size + 4 bytes of version header */
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emi_isu_buf_attr.size = isu->buf_size + 4;
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ret = sysfs_create_bin_file(&pdev->dev.kobj, &emi_isu_buf_attr);
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if (ret) {
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dev_err(&pdev->dev, "Failed to create buf file\n");
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return ret;
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}
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platform_set_drvdata(pdev, isu);
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global_emi_isu = isu;
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dev_info(&pdev->dev, "%s(%x),%s(%lx),%s(%lx),%s(%lx),%s(%d)\n",
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"buf_size", isu->buf_size,
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"buf_addr", (unsigned long)(isu->buf_addr),
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"ver_addr", (unsigned long)(isu->ver_addr),
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"con_addr", (unsigned long)(isu->con_addr),
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"ctrl_intf", isu->ctrl_intf);
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return 0;
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}
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static int emiisu_remove(struct platform_device *pdev)
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{
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sysfs_remove_bin_file(&pdev->dev.kobj, &emi_isu_buf_attr);
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global_emi_isu = NULL;
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return 0;
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}
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static struct platform_driver emiisu_drv = {
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.probe = emiisu_probe,
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.remove = emiisu_remove,
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.driver = {
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.name = "emiisu_drv",
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.owner = THIS_MODULE,
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.of_match_table = emiisu_of_ids,
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},
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};
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int emiisu_init(void)
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{
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int ret;
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pr_info("emiisu wad loaded\n");
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ret = platform_driver_register(&emiisu_drv);
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if (ret) {
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pr_err("emiisu: failed to register dirver\n");
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return ret;
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}
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ret = driver_create_file(&emiisu_drv.driver,
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&driver_attr_emiisu_ctrl);
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if (ret) {
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pr_err("emiisu: failed to create control file\n");
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return ret;
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}
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return 0;
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}
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MODULE_DESCRIPTION("MediaTek EMI Driver");
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MODULE_LICENSE("GPL v2");
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