// 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/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 MAX9295_I2C_ADDR_DEF 0x40
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#define MAX9295_CHIP_ID 0x91
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#define MAX9295_REG_CHIP_ID 0x0D
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static int max9295_i2c_addr_remap(maxim4c_remote_t *max9295)
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{
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struct device *dev = max9295->dev;
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struct i2c_client *client = max9295->client;
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u16 i2c_8bit_addr = 0;
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int ret = 0;
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if (max9295->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(max9295, MAXIM4C_I2C_SER_DEF);
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i2c_8bit_addr = (max9295->ser_i2c_addr_map << 1);
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ret = maxim4c_i2c_write_byte(client,
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0x0000, MAXIM4C_I2C_REG_ADDR_16BITS,
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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(max9295, MAXIM4C_I2C_SER_MAP);
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}
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if (max9295->cam_i2c_addr_map) {
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dev_info(dev, "Camera i2c address remap\n");
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i2c_8bit_addr = (max9295->cam_i2c_addr_map << 1);
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ret = maxim4c_i2c_write_byte(client,
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0x0042, MAXIM4C_I2C_REG_ADDR_16BITS,
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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 = (max9295->cam_i2c_addr_def << 1);
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ret = maxim4c_i2c_write_byte(client,
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0x0043, MAXIM4C_I2C_REG_ADDR_16BITS,
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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 max9295_i2c_addr_def(maxim4c_remote_t *max9295)
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{
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struct device *dev = max9295->dev;
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struct i2c_client *client = max9295->client;
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u16 i2c_8bit_addr = 0;
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int ret = 0;
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if (max9295->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(max9295, MAXIM4C_I2C_SER_MAP);
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i2c_8bit_addr = (max9295->ser_i2c_addr_def << 1);
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ret = maxim4c_i2c_write_byte(client,
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0x0000, MAXIM4C_I2C_REG_ADDR_16BITS,
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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(max9295, MAXIM4C_I2C_SER_DEF);
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}
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return 0;
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}
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static int max9295_check_chipid(maxim4c_remote_t *max9295)
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{
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struct device *dev = max9295->dev;
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struct i2c_client *client = max9295->client;
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u8 chip_id;
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int ret = 0;
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// max9295
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ret = maxim4c_i2c_read_byte(client,
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MAX9295_REG_CHIP_ID, MAXIM4C_I2C_REG_ADDR_16BITS,
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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(max9295, MAXIM4C_I2C_SER_MAP);
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ret = maxim4c_i2c_read_byte(client,
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MAX9295_REG_CHIP_ID, MAXIM4C_I2C_REG_ADDR_16BITS,
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&chip_id);
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if (ret != 0) {
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dev_err(dev, "MAX9295 detect error, ret(%d)\n", ret);
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maxim4c_remote_i2c_addr_select(max9295, MAXIM4C_I2C_SER_DEF);
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return -ENODEV;
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}
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max9295_i2c_addr_def(max9295);
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}
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if (chip_id != MAX9295_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 MAX9295 chip id: 0x%02x\n", chip_id);
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return 0;
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}
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static int max9295_soft_power_down(maxim4c_remote_t *max9295)
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{
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struct device *dev = max9295->dev;
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struct i2c_client *client = max9295->client;
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int ret = 0;
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ret = maxim4c_i2c_write_byte(client,
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0x10, MAXIM4C_I2C_REG_ADDR_16BITS,
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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 max9295_module_init(maxim4c_remote_t *max9295)
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{
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struct device *dev = max9295->dev;
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struct i2c_client *client = max9295->client;
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int ret = 0;
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ret = maxim4c_remote_i2c_addr_select(max9295, MAXIM4C_I2C_SER_DEF);
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if (ret)
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return ret;
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ret = max9295_check_chipid(max9295);
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if (ret)
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return ret;
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ret = max9295_i2c_addr_remap(max9295);
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if (ret)
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return ret;
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ret = maxim4c_i2c_run_init_seq(client,
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&max9295->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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max9295->remote_id);
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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 max9295_module_deinit(maxim4c_remote_t *max9295)
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{
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int ret = 0;
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#if 0
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ret |= max9295_i2c_addr_def(max9295);
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#endif
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ret |= max9295_soft_power_down(max9295);
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return ret;
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}
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static const struct maxim4c_remote_ops max9295_ops = {
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.remote_init = max9295_module_init,
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.remote_deinit = max9295_module_deinit,
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};
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static int max9295_parse_dt(maxim4c_remote_t *max9295)
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{
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struct device *dev = max9295->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 max9295 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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max9295->remote_id = value;
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} else {
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max9295->remote_id = MAXIM4C_LINK_ID_MAX;
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}
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dev_info(dev, "max9295 remote id: %d\n", max9295->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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max9295->ser_i2c_addr_def = value;
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} else {
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max9295->ser_i2c_addr_def = MAX9295_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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max9295->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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max9295->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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max9295->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 max9295_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 *max9295 = 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, "max9295 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, "max9295 probe match data error\n");
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return -EINVAL;
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}
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dev_info(&pdev->dev, "max9295 probe link id = %d\n", link_id);
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max9295 = devm_kzalloc(&pdev->dev, sizeof(*max9295), GFP_KERNEL);
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if (!max9295) {
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dev_err(&pdev->dev, "max9295 probe no memory error\n");
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return -ENOMEM;
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}
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max9295->dev = &pdev->dev;
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max9295->remote_ops = &max9295_ops;
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max9295->local = maxim4c;
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dev_set_drvdata(max9295->dev, max9295);
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max9295_parse_dt(max9295);
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if (max9295->remote_id != link_id) {
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dev_err(&pdev->dev, "max9295 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(max9295, 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, max9295);
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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(max9295);
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return 0;
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}
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static int max9295_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 max9295_of_table[] = {
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{
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.compatible = "maxim4c,link0,max9295",
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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,max9295",
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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,max9295",
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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,max9295",
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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, max9295_of_table);
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static struct platform_driver max9295_driver = {
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.probe = max9295_probe,
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.remove = max9295_remove,
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.driver = {
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.name = "max9295",
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.of_match_table = max9295_of_table,
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},
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};
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module_platform_driver(max9295_driver);
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MODULE_AUTHOR("Cai Wenzhong <cwz@rock-chips.com>");
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MODULE_DESCRIPTION("Maxim MAX9295 Serializer Driver");
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MODULE_LICENSE("GPL");
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