// SPDX-License-Identifier: GPL-2.0
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/*
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* Maxim Quad GMSL2/GMSL1 to CSI-2 Serializer driver
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*
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* Copyright (C) 2023 Rockchip Electronics Co., Ltd.
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*
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* Author: Cai Wenzhong <cwz@rock-chips.com>
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*
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*/
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include "maxim4c_api.h"
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#define MAX96715_I2C_ADDR_DEF 0x40
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#define MAX96715_CHIP_ID 0x45
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#define MAX96715_REG_CHIP_ID 0x1E
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/* Config and Video mode switch */
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#define MAX96715_MODE_SWITCH 1
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enum {
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LINK_MODE_VIDEO = 0,
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LINK_MODE_CONFIG,
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};
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static int __maybe_unused max96715_link_mode_select(maxim4c_remote_t *max96715, u32 mode)
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{
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struct device *dev = max96715->dev;
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struct i2c_client *client = max96715->client;
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u8 reg_mask = 0, reg_value = 0;
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u32 delay_ms = 0;
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int ret = 0;
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dev_dbg(dev, "%s: mode = %d\n", __func__, mode);
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reg_mask = BIT(7) | BIT(6);
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if (mode == LINK_MODE_CONFIG) {
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reg_value = BIT(6);
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delay_ms = 5;
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} else {
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reg_value = BIT(7);
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delay_ms = 50;
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}
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ret |= maxim4c_i2c_update_byte(client,
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0x04, MAXIM4C_I2C_REG_ADDR_08BITS,
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reg_mask, reg_value);
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msleep(delay_ms);
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return ret;
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}
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static int max96715_i2c_addr_remap(maxim4c_remote_t *max96715)
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{
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struct device *dev = max96715->dev;
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struct i2c_client *client = max96715->client;
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u16 i2c_8bit_addr = 0;
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int ret = 0;
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if (max96715->ser_i2c_addr_map) {
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dev_info(dev, "Serializer i2c address remap\n");
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maxim4c_remote_i2c_addr_select(max96715, MAXIM4C_I2C_SER_DEF);
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i2c_8bit_addr = (max96715->ser_i2c_addr_map << 1);
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ret = maxim4c_i2c_write_byte(client,
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0x00, MAXIM4C_I2C_REG_ADDR_08BITS,
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i2c_8bit_addr);
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if (ret) {
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dev_err(dev, "ser i2c address map setting error!\n");
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return ret;
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}
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maxim4c_remote_i2c_addr_select(max96715, MAXIM4C_I2C_SER_MAP);
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}
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if (max96715->cam_i2c_addr_map) {
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dev_info(dev, "Camera i2c address remap\n");
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i2c_8bit_addr = (max96715->cam_i2c_addr_map << 1);
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ret = maxim4c_i2c_write_byte(client,
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0x09, MAXIM4C_I2C_REG_ADDR_08BITS,
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i2c_8bit_addr);
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if (ret) {
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dev_err(dev, "cam i2c address source setting error!\n");
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return ret;
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}
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i2c_8bit_addr = (max96715->cam_i2c_addr_def << 1);
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ret = maxim4c_i2c_write_byte(client,
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0x0A, MAXIM4C_I2C_REG_ADDR_08BITS,
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i2c_8bit_addr);
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if (ret) {
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dev_err(dev, "cam i2c address destination setting error!\n");
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return ret;
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}
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}
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return 0;
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}
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static int max96715_i2c_addr_def(maxim4c_remote_t *max96715)
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{
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struct device *dev = max96715->dev;
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struct i2c_client *client = max96715->client;
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u16 i2c_8bit_addr = 0;
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int ret = 0;
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if (max96715->ser_i2c_addr_map) {
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dev_info(dev, "Serializer i2c address def\n");
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maxim4c_remote_i2c_addr_select(max96715, MAXIM4C_I2C_SER_MAP);
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i2c_8bit_addr = (max96715->ser_i2c_addr_def << 1);
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ret = maxim4c_i2c_write_byte(client,
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0x00, MAXIM4C_I2C_REG_ADDR_08BITS,
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i2c_8bit_addr);
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if (ret) {
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dev_err(dev, "ser i2c address def setting error!\n");
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return ret;
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}
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maxim4c_remote_i2c_addr_select(max96715, MAXIM4C_I2C_SER_DEF);
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}
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return 0;
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}
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static int max96715_check_chipid(maxim4c_remote_t *max96715)
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{
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struct device *dev = max96715->dev;
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struct i2c_client *client = max96715->client;
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u8 chip_id;
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int ret = 0;
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// max96715
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ret = maxim4c_i2c_read_byte(client,
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MAX96715_REG_CHIP_ID, MAXIM4C_I2C_REG_ADDR_08BITS,
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&chip_id);
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if (ret != 0) {
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dev_info(dev, "Retry check chipid using map address\n");
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maxim4c_remote_i2c_addr_select(max96715, MAXIM4C_I2C_SER_MAP);
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ret = maxim4c_i2c_read_byte(client,
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MAX96715_REG_CHIP_ID, MAXIM4C_I2C_REG_ADDR_08BITS,
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&chip_id);
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if (ret != 0) {
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dev_err(dev, "MAX96715 detect error, ret(%d)\n", ret);
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maxim4c_remote_i2c_addr_select(max96715, MAXIM4C_I2C_SER_DEF);
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return -ENODEV;
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}
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max96715_i2c_addr_def(max96715);
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}
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if (chip_id != MAX96715_CHIP_ID) {
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dev_err(dev, "Unexpected chip id = %02x\n", chip_id);
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return -ENODEV;
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}
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dev_info(dev, "Detected MAX96715 chip id: 0x%02x\n", chip_id);
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return 0;
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}
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static int max96715_soft_power_down(maxim4c_remote_t *max96715)
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{
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struct device *dev = max96715->dev;
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struct i2c_client *client = max96715->client;
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int ret = 0;
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ret = maxim4c_i2c_write_byte(client,
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0x13, MAXIM4C_I2C_REG_ADDR_08BITS,
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BIT(7));
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if (ret) {
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dev_err(dev, "soft power down setting error!\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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static int max96715_module_init(maxim4c_remote_t *max96715)
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{
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struct device *dev = max96715->dev;
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struct i2c_client *client = max96715->client;
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struct maxim4c *maxim4c = max96715->local;
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int ret = 0;
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ret = maxim4c_remote_i2c_addr_select(max96715, MAXIM4C_I2C_SER_DEF);
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if (ret)
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return ret;
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ret = max96715_check_chipid(max96715);
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if (ret)
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return ret;
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ret = max96715_i2c_addr_remap(max96715);
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if (ret)
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return ret;
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#if MAX96715_MODE_SWITCH
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if (maxim4c->hot_plug_irq > 0)
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disable_irq(maxim4c->hot_plug_irq);
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ret = max96715_link_mode_select(max96715, LINK_MODE_CONFIG);
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if (ret) {
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if (maxim4c->hot_plug_irq > 0)
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enable_irq(maxim4c->hot_plug_irq);
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return ret;
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}
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#endif
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ret = maxim4c_i2c_run_init_seq(client,
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&max96715->remote_init_seq);
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if (ret) {
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dev_err(dev, "remote id = %d init sequence error\n",
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max96715->remote_id);
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if (maxim4c->hot_plug_irq > 0)
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enable_irq(maxim4c->hot_plug_irq);
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return ret;
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}
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#if MAX96715_MODE_SWITCH
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ret = max96715_link_mode_select(max96715, LINK_MODE_VIDEO);
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if (maxim4c->hot_plug_irq > 0)
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enable_irq(maxim4c->hot_plug_irq);
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if (ret)
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return ret;
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#endif
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return 0;
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}
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static int max96715_module_deinit(maxim4c_remote_t *max96715)
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{
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int ret = 0;
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#if 0
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ret |= max96715_i2c_addr_def(max96715);
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#endif
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ret |= max96715_soft_power_down(max96715);
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return ret;
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}
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static const struct maxim4c_remote_ops max96715_ops = {
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.remote_init = max96715_module_init,
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.remote_deinit = max96715_module_deinit,
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};
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static int max96715_parse_dt(maxim4c_remote_t *max96715)
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{
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struct device *dev = max96715->dev;
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struct device_node *of_node = dev->of_node;
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u32 value = 0;
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int ret = 0;
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dev_info(dev, "=== maxim4c remote max96715 parse dt ===\n");
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ret = of_property_read_u32(of_node, "remote-id", &value);
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if (ret == 0) {
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dev_info(dev, "remote-id property: %d\n", value);
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max96715->remote_id = value;
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} else {
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max96715->remote_id = MAXIM4C_LINK_ID_MAX;
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}
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dev_info(dev, "max96715 remote id: %d\n", max96715->remote_id);
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ret = of_property_read_u32(of_node, "ser-i2c-addr-def", &value);
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if (ret == 0) {
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dev_info(dev, "ser-i2c-addr-def property: 0x%x", value);
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max96715->ser_i2c_addr_def = value;
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} else {
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max96715->ser_i2c_addr_def = MAX96715_I2C_ADDR_DEF;
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}
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ret = of_property_read_u32(of_node, "ser-i2c-addr-map", &value);
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if (ret == 0) {
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dev_info(dev, "ser-i2c-addr-map property: 0x%x", value);
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max96715->ser_i2c_addr_map = value;
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}
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ret = of_property_read_u32(of_node, "cam-i2c-addr-def", &value);
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if (ret == 0) {
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dev_info(dev, "cam-i2c-addr-def property: 0x%x", value);
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max96715->cam_i2c_addr_def = value;
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}
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ret = of_property_read_u32(of_node, "cam-i2c-addr-map", &value);
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if (ret == 0) {
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dev_info(dev, "cam-i2c-addr-map property: 0x%x", value);
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max96715->cam_i2c_addr_map = value;
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}
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return 0;
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}
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static int max96715_probe(struct platform_device *pdev)
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{
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struct i2c_client *client = to_i2c_client(pdev->dev.parent);
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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struct maxim4c *maxim4c = v4l2_get_subdevdata(sd);
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struct maxim4c_remote *max96715 = NULL;
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u32 link_id = MAXIM4C_LINK_ID_MAX;
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int ret = 0;
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dev_info(&pdev->dev, "max96715 serializer probe\n");
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link_id = (uintptr_t)of_device_get_match_data(&pdev->dev);
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link_id = link_id - MAXIM4C_LINK_ID_MAX;
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if (link_id >= MAXIM4C_LINK_ID_MAX) {
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dev_err(&pdev->dev, "max96715 probe match data error\n");
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return -EINVAL;
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}
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dev_info(&pdev->dev, "max96715 probe link id = %d\n", link_id);
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max96715 = devm_kzalloc(&pdev->dev, sizeof(*max96715), GFP_KERNEL);
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if (!max96715) {
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dev_err(&pdev->dev, "max96715 probe no memory error\n");
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return -ENOMEM;
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}
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max96715->dev = &pdev->dev;
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max96715->remote_ops = &max96715_ops;
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max96715->local = maxim4c;
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dev_set_drvdata(max96715->dev, max96715);
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max96715_parse_dt(max96715);
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if (max96715->remote_id != link_id) {
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dev_err(&pdev->dev, "max96715 probe remote_id error\n");
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return -EINVAL;
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}
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ret = maxim4c_remote_i2c_client_init(max96715, client);
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if (ret) {
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dev_err(&pdev->dev, "remote i2c client init error\n");
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return ret;
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}
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ret = maxim4c_remote_device_register(maxim4c, max96715);
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if (ret) {
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dev_err(&pdev->dev, "remote serializer register error\n");
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return ret;
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}
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maxim4c_remote_load_init_seq(max96715);
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return 0;
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}
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static int max96715_remove(struct platform_device *pdev)
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{
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return 0;
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}
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static const struct of_device_id max96715_of_table[] = {
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{
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.compatible = "maxim4c,link0,max96715",
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.data = (const void *)(MAXIM4C_LINK_ID_MAX + MAXIM4C_LINK_ID_A)
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}, {
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.compatible = "maxim4c,link1,max96715",
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.data = (const void *)(MAXIM4C_LINK_ID_MAX + MAXIM4C_LINK_ID_B)
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}, {
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.compatible = "maxim4c,link2,max96715",
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.data = (const void *)(MAXIM4C_LINK_ID_MAX + MAXIM4C_LINK_ID_C)
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}, {
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.compatible = "maxim4c,link3,max96715",
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.data = (const void *)(MAXIM4C_LINK_ID_MAX + MAXIM4C_LINK_ID_D)
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},
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{ /* Sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, max96715_of_table);
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static struct platform_driver max96715_driver = {
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.probe = max96715_probe,
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.remove = max96715_remove,
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.driver = {
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.name = "max96715",
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.of_match_table = max96715_of_table,
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},
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};
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module_platform_driver(max96715_driver);
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MODULE_AUTHOR("Cai Wenzhong <cwz@rock-chips.com>");
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MODULE_DESCRIPTION("Maxim MAX96715 Serializer Driver");
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MODULE_LICENSE("GPL");
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