// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2022 Rockchip Electronics Co. Ltd.
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*
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* Author: Jianwei Fan <jianwei.fan@rock-chips.com>
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*
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* V0.0X01.0X00 first version.
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* V0.0X01.0X01 add device attr hdmirxsel.
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* V0.0X01.0X02 add device attr hdmiautoswitch.
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*
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*/
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// #define DEBUG
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#include <linux/miscdevice.h>
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#include <linux/cdev.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/i2c-dev.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/compat.h>
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#include <linux/printk.h>
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#include <linux/kobject.h>
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#include <linux/version.h>
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#include <linux/time.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#define DRIVER_VERSION KERNEL_VERSION(0, 0x01, 0x02)
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#define DRIVER_NAME "EP9461E"
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/*control reg*/
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#define RX_SIGNAL_DETECT 0x00
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#define GENERAL_CONTROL 0x08
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#define RX_SEL_CONTROL 0x09
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#define EDID_ENABLE 0x0B
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#define ENTER_CODE 0x07
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/*control mask*/
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#define MASK_RX0_SIGNAL 0x10
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#define MASK_AUTO_SWITCH 0x40
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#define MASK_CEC_SWITCH 0x20
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#define MASK_POWER 0x80
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#define MASK_RX_SEL 0x0f
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struct ep9461e_dev {
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struct device *dev;
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struct miscdevice miscdev;
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struct i2c_client *client;
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struct mutex confctl_mutex;
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struct timer_list timer;
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struct delayed_work work_i2c_poll;
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bool auto_switch_en;
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bool power_up_chip_en;
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bool cec_switch_en;
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bool nosignal;
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u32 hdmi_rx_sel;
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int err_cnt;
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};
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static struct ep9461e_dev *g_ep9461e;
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static struct ep9461e_dev *ep9461e;
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static void ep9461e_rx_select(struct ep9461e_dev *ep9461e);
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static void ep9461e_rx_manual_select(struct ep9461e_dev *ep9461e);
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static void i2c_wr(struct ep9461e_dev *ep9461e, u16 reg, u8 *val, u32 n)
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{
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struct i2c_msg msg;
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struct i2c_client *client = ep9461e->client;
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int err;
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u8 data[128];
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data[0] = reg;
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memcpy(&data[1], val, n);
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msg.addr = client->addr;
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msg.flags = 0;
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msg.buf = data;
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msg.len = n + 1;
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err = i2c_transfer(client->adapter, &msg, 1);
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if (err != 1) {
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dev_err(ep9461e->dev, "writing register 0x%x from 0x%x failed\n",
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reg, client->addr);
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} else {
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switch (n) {
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case 1:
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dev_dbg(ep9461e->dev, "I2C write 0x%02x = 0x%02x\n",
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reg, data[1]);
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break;
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case 2:
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dev_dbg(ep9461e->dev,
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"I2C write 0x%02x = 0x%02x%02x\n",
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reg, data[2], data[1]);
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break;
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case 4:
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dev_dbg(ep9461e->dev,
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"I2C write 0x%02x = 0x%02x%02x%02x%02x\n",
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reg, data[4], data[3], data[2], data[1]);
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break;
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default:
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dev_dbg(ep9461e->dev,
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"I2C write %d bytes from address 0x%02x\n",
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n, reg);
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}
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}
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}
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static void i2c_rd(struct ep9461e_dev *ep9461e, u16 reg, u8 *val, u32 n)
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{
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struct i2c_msg msg[2];
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struct i2c_client *client = ep9461e->client;
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int err;
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u8 buf[1] = { reg };
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/*msg[0] addr to read*/
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msg[0].addr = client->addr;
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msg[0].flags = 0;
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msg[0].buf = buf;
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msg[0].len = 1;
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/*msg[1] read data*/
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msg[1].addr = client->addr;
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msg[1].flags = I2C_M_RD;
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msg[1].buf = val;
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msg[1].len = n;
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err = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
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if (err != ARRAY_SIZE(msg)) {
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dev_err(ep9461e->dev, "reading register 0x%x from 0x%x failed\n",
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reg, client->addr);
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}
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}
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static void i2c_rd8(struct ep9461e_dev *ep9461e, u16 reg, u8 *val)
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{
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i2c_rd(ep9461e, reg, val, 1);
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}
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static void i2c_wr8(struct ep9461e_dev *ep9461e, u16 reg, u8 buf)
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{
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i2c_wr(ep9461e, reg, &buf, 1);
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}
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static void i2c_wr8_and_or(struct ep9461e_dev *ep9461e, u16 reg, u32 mask,
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u32 val)
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{
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u8 val_p;
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i2c_rd8(ep9461e, reg, &val_p);
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i2c_wr8(ep9461e, reg, (val_p & mask) | val);
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}
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static long ep9461e_ioctl(struct file *file, uint32_t cmd, unsigned long arg)
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{
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return 0;
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}
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static ssize_t ep9461e_write(struct file *file, const char __user *buf,
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size_t size, loff_t *ppos)
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{
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return 1;
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}
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static ssize_t ep9461e_read(struct file *file, char __user *buf, size_t size,
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loff_t *ppos)
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{
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return 1;
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}
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static ssize_t hdmirxsel_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ep9461e_dev *ep9461e = g_ep9461e;
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dev_info(ep9461e->dev, "%s: hdmi rx select state: %d\n",
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__func__, ep9461e->hdmi_rx_sel);
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return sprintf(buf, "%d\n", ep9461e->hdmi_rx_sel);
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}
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static ssize_t hdmirxsel_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ep9461e_dev *ep9461e = g_ep9461e;
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u32 hdmirxstate = 0;
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int ret;
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ret = kstrtouint(buf, 10, &hdmirxstate);
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if (!ret) {
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dev_dbg(ep9461e->dev, "state: %d\n", hdmirxstate);
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ep9461e->hdmi_rx_sel = hdmirxstate;
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if (ep9461e->auto_switch_en | ep9461e->cec_switch_en)
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ep9461e->auto_switch_en = ep9461e->cec_switch_en = 0;
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ep9461e_rx_select(ep9461e);
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} else {
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dev_err(ep9461e->dev, "write hdmi_rx_sel failed!!!\n");
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}
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return count;
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}
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static ssize_t hdmiautoswitch_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ep9461e_dev *ep9461e = g_ep9461e;
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dev_info(ep9461e->dev, "hdmi rx select auto_switch state: %d\n",
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ep9461e->auto_switch_en);
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return sprintf(buf, "%d\n", ep9461e->auto_switch_en);
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}
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static ssize_t hdmiautoswitch_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ep9461e_dev *ep9461e = g_ep9461e;
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u32 hdmiautoswitch = 0;
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int ret;
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ret = kstrtouint(buf, 10, &hdmiautoswitch);
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if (!ret) {
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dev_dbg(ep9461e->dev, "state: %d\n", hdmiautoswitch);
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ep9461e->auto_switch_en = hdmiautoswitch;
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ep9461e_rx_select(ep9461e);
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} else {
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dev_err(ep9461e->dev, "write hdmi auto switch failed!!!\n");
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}
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return count;
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}
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static DEVICE_ATTR_RW(hdmirxsel);
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static DEVICE_ATTR_RW(hdmiautoswitch);
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static inline bool detect_rx_signal(struct ep9461e_dev *ep9461e)
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{
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u8 val;
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i2c_rd8(ep9461e, RX_SIGNAL_DETECT, &val);
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if (!(val & MASK_RX0_SIGNAL))
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return false;
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else
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return true;
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}
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static void ep9461e_init(struct ep9461e_dev *ep9461e)
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{
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ep9461e->power_up_chip_en = false;
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ep9461e->auto_switch_en = false;
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ep9461e->hdmi_rx_sel = 0;
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ep9461e->err_cnt = 0;
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if (ep9461e->power_up_chip_en) {
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i2c_wr8_and_or(ep9461e, GENERAL_CONTROL, ~MASK_POWER,
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MASK_POWER);
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}
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ep9461e_rx_select(ep9461e);
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schedule_delayed_work(&ep9461e->work_i2c_poll, msecs_to_jiffies(1000));
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}
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static void ep9461e_rx_manual_select(struct ep9461e_dev *ep9461e)
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{
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i2c_wr8(ep9461e, RX_SEL_CONTROL, ep9461e->hdmi_rx_sel);
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}
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static void ep9461e_rx_select(struct ep9461e_dev *ep9461e)
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{
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int ret;
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if (ep9461e->auto_switch_en) {
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i2c_wr8_and_or(ep9461e, GENERAL_CONTROL, ~MASK_AUTO_SWITCH,
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MASK_AUTO_SWITCH);
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} else {
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ep9461e_rx_manual_select(ep9461e);
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}
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ret = detect_rx_signal(ep9461e);
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if (ret)
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dev_info(ep9461e->dev, "Detect HDMI RX valid signal!\n");
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else
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dev_err(ep9461e->dev, "HDMI RX has no valid signal!\n");
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}
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static void ep9461e_work_i2c_poll(struct work_struct *work)
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{
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int ret;
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struct delayed_work *dwork = to_delayed_work(work);
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struct ep9461e_dev *ep9461e =
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container_of(dwork, struct ep9461e_dev, work_i2c_poll);
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ret = detect_rx_signal(ep9461e);
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if (!ret && (ep9461e->err_cnt < 10)) {
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ep9461e->err_cnt++;
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dev_err(ep9461e->dev,
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"ERROR: HDMI RX has no valid signal, err cnt: %d\n",
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ep9461e->err_cnt);
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if (ep9461e->err_cnt >= 10)
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dev_err(ep9461e->dev,
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"error count greater than 10, please check HDMIRX!");
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} else if (ret) {
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ep9461e->err_cnt = 0;
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}
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schedule_delayed_work(&ep9461e->work_i2c_poll, msecs_to_jiffies(1000));
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}
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static const struct file_operations ep9461e_fops = {
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.owner = THIS_MODULE,
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.read = ep9461e_read,
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.write = ep9461e_write,
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.unlocked_ioctl = ep9461e_ioctl,
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};
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struct miscdevice ep9461e_miscdev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "ep9461e_dev",
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.fops = &ep9461e_fops,
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};
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static int ep9461e_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct ep9461e_dev *ep9461e;
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struct device *dev = &client->dev;
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int ret;
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dev_info(dev, "driver version: %02x.%02x.%02x",
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DRIVER_VERSION >> 16,
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(DRIVER_VERSION & 0xff00) >> 8,
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DRIVER_VERSION & 0x00ff);
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -EIO;
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dev_info(dev, "chip found @ 0x%x (%s)\n", client->addr << 1,
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client->adapter->name);
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ep9461e = devm_kzalloc(dev, sizeof(struct ep9461e_dev), GFP_KERNEL);
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if (!ep9461e)
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return -ENOMEM;
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ep9461e->client = client;
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ep9461e->dev = dev;
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client->flags |= I2C_CLIENT_SCCB;
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ret = misc_register(&ep9461e_miscdev);
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if (ret) {
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dev_err(ep9461e->dev,
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"EP9461E ERROR: could not register ep9461e device\n");
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return ret;
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}
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mutex_init(&ep9461e->confctl_mutex);
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ret = device_create_file(ep9461e_miscdev.this_device,
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&dev_attr_hdmirxsel);
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if (ret) {
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dev_err(ep9461e->dev, "failed to create attr hdmirxsel!\n");
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goto err1;
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}
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ret = device_create_file(ep9461e_miscdev.this_device,
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&dev_attr_hdmiautoswitch);
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if (ret) {
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dev_err(ep9461e->dev,
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"failed to create attr hdmiautoswitch!\n");
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goto err;
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}
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INIT_DELAYED_WORK(&ep9461e->work_i2c_poll, ep9461e_work_i2c_poll);
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ep9461e_init(ep9461e);
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g_ep9461e = ep9461e;
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dev_info(ep9461e->dev, "%s found @ 0x%x (%s)\n",
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client->name, client->addr << 1,
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client->adapter->name);
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return 0;
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err:
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device_remove_file(ep9461e_miscdev.this_device,
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&dev_attr_hdmirxsel);
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err1:
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misc_deregister(&ep9461e_miscdev);
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return ret;
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}
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static int ep9461e_remove(struct i2c_client *client)
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{
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cancel_delayed_work_sync(&ep9461e->work_i2c_poll);
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device_remove_file(ep9461e_miscdev.this_device,
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&dev_attr_hdmirxsel);
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device_remove_file(ep9461e_miscdev.this_device,
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&dev_attr_hdmiautoswitch);
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mutex_destroy(&ep9461e->confctl_mutex);
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misc_deregister(&ep9461e_miscdev);
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return 0;
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}
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static const struct of_device_id ep9461e_of_match[] = {
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{ .compatible = "semiconn,ep9461e" },
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{}
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};
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MODULE_DEVICE_TABLE(of, ep9461e_of_match);
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static struct i2c_driver ep9461e_driver = {
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.probe = ep9461e_probe,
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.remove = ep9461e_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = DRIVER_NAME,
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.of_match_table = of_match_ptr(ep9461e_of_match),
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},
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};
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static int __init ep9461e_driver_init(void)
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{
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return i2c_add_driver(&ep9461e_driver);
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}
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static void __exit ep9461e_driver_exit(void)
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{
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i2c_del_driver(&ep9461e_driver);
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}
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device_initcall_sync(ep9461e_driver_init);
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module_exit(ep9461e_driver_exit);
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MODULE_DESCRIPTION("semiconn EP9461E 4 HDMI in switch driver");
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MODULE_AUTHOR("Jianwei Fan <jianwei.fan@rock-chips.com>");
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MODULE_LICENSE("GPL v2");
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