// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2022 Rockchip Co.,Ltd.
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* Author: Wang Jie <dave.wang@rock-chips.com>
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*
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* Etek ET7303 Type-C Chip Driver
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/gpio/consumer.h>
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#include <linux/usb/tcpm.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include "tcpci.h"
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#define ET7303_VID 0x6DCF
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#define ET7303_PID 0x1711
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#define ET7303_RTCTRL8 0x9B
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/* Autoidle timeout = (tout * 2 + 1) * 6.4ms */
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#define ET7303_RTCTRL8_SET(ck300, ship_off, auto_idle, tout) \
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(((ck300) << 7) | ((ship_off) << 5) | \
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((auto_idle) << 3) | ((tout) & 0x07))
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#define ET7303_RTCTRL13 0xA0
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#define ET7303_RTCTRL14 0xA1
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#define ET7303_RTCTRL15 0xA2
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#define ET7303_RTCTRL16 0xA3
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struct et7303_chip {
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struct tcpci_data data;
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struct tcpci *tcpci;
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struct device *dev;
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struct regulator *vbus;
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bool vbus_on;
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};
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static int et7303_read16(struct et7303_chip *chip, unsigned int reg, u16 *val)
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{
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return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u16));
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}
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static int et7303_write16(struct et7303_chip *chip, unsigned int reg, u16 val)
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{
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return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u16));
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}
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static int et7303_read8(struct et7303_chip *chip, unsigned int reg, u8 *val)
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{
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return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u8));
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}
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static int et7303_write8(struct et7303_chip *chip, unsigned int reg, u8 val)
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{
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return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u8));
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}
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static const struct regmap_config et7303_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = 0xFF, /* 0x80 .. 0xFF are vendor defined */
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};
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static struct et7303_chip *tdata_to_et7303(struct tcpci_data *tdata)
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{
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return container_of(tdata, struct et7303_chip, data);
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}
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static int et7303_init(struct tcpci *tcpci, struct tcpci_data *tdata)
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{
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int ret;
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struct et7303_chip *chip = tdata_to_et7303(tdata);
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/* CK 300K from 320K, shipping off, auto_idle enable, tout = 32ms */
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ret = et7303_write8(chip, ET7303_RTCTRL8,
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ET7303_RTCTRL8_SET(0, 1, 1, 2));
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/* tTCPCfilter : (26.7 * val) us */
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ret |= et7303_write8(chip, ET7303_RTCTRL14, 0x0F);
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/* tDRP : (51.2 + 6.4 * val) ms */
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ret |= et7303_write8(chip, ET7303_RTCTRL15, 0x04);
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/* dcSRC.DRP : 33% */
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ret |= et7303_write16(chip, ET7303_RTCTRL16, 330);
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if (ret < 0)
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dev_err(chip->dev, "fail to init registers(%d)\n", ret);
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return ret;
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}
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static int et7303_set_vbus(struct tcpci *tcpci, struct tcpci_data *tdata,
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bool on, bool charge)
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{
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struct et7303_chip *chip = tdata_to_et7303(tdata);
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int ret = 0;
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if (chip->vbus_on == on) {
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dev_dbg(chip->dev, "vbus is already %s", on ? "On" : "Off");
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goto done;
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}
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if (on)
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ret = regulator_enable(chip->vbus);
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else
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ret = regulator_disable(chip->vbus);
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if (ret < 0) {
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dev_err(chip->dev, "cannot %s vbus regulator, ret=%d",
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on ? "enable" : "disable", ret);
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goto done;
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}
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chip->vbus_on = on;
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done:
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return ret;
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}
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static int et7303_set_vconn(struct tcpci *tcpci, struct tcpci_data *tdata,
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bool enable)
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{
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struct et7303_chip *chip = tdata_to_et7303(tdata);
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return et7303_write8(chip, ET7303_RTCTRL8,
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ET7303_RTCTRL8_SET(0, 1, !enable, 2));
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}
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static int et7303_start_drp_toggling(struct tcpci *tcpci,
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struct tcpci_data *tdata,
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enum typec_cc_status cc)
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{
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struct et7303_chip *chip = tdata_to_et7303(tdata);
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int ret;
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unsigned int reg = 0;
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switch (cc) {
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default:
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case TYPEC_CC_RP_DEF:
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reg |= (TCPC_ROLE_CTRL_RP_VAL_DEF <<
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TCPC_ROLE_CTRL_RP_VAL_SHIFT);
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break;
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case TYPEC_CC_RP_1_5:
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reg |= (TCPC_ROLE_CTRL_RP_VAL_1_5 <<
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TCPC_ROLE_CTRL_RP_VAL_SHIFT);
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break;
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case TYPEC_CC_RP_3_0:
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reg |= (TCPC_ROLE_CTRL_RP_VAL_3_0 <<
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TCPC_ROLE_CTRL_RP_VAL_SHIFT);
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break;
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}
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if (cc == TYPEC_CC_RD)
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reg |= (TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC1_SHIFT) |
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(TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC2_SHIFT);
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else
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reg |= (TCPC_ROLE_CTRL_CC_RP << TCPC_ROLE_CTRL_CC1_SHIFT) |
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(TCPC_ROLE_CTRL_CC_RP << TCPC_ROLE_CTRL_CC2_SHIFT);
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ret = et7303_write8(chip, TCPC_ROLE_CTRL, reg);
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if (ret < 0)
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return ret;
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usleep_range(500, 1000);
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return 0;
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}
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static irqreturn_t et7303_irq(int irq, void *dev_id)
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{
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int ret;
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u16 alert;
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u8 status;
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struct et7303_chip *chip = dev_id;
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ret = et7303_read16(chip, TCPC_ALERT, &alert);
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if (ret < 0)
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goto out;
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if (alert & TCPC_ALERT_CC_STATUS) {
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ret = et7303_read8(chip, TCPC_CC_STATUS, &status);
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if (ret < 0)
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goto out;
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/* Clear cc change event triggered by starting toggling */
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if (status & TCPC_CC_STATUS_TOGGLING)
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et7303_write8(chip, TCPC_ALERT, TCPC_ALERT_CC_STATUS);
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}
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out:
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return tcpci_irq(chip->tcpci);
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}
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static int et7303_sw_reset(struct et7303_chip *chip)
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{
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int ret;
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ret = et7303_write8(chip, ET7303_RTCTRL13, 0x01);
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if (ret < 0)
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return ret;
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usleep_range(1000, 2000);
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return 0;
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}
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static int et7303_check_revision(struct i2c_client *i2c)
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{
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int ret;
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ret = i2c_smbus_read_word_data(i2c, TCPC_VENDOR_ID);
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if (ret < 0) {
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dev_err(&i2c->dev, "fail to read Vendor id(%d)\n", ret);
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return ret;
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}
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if (ret != ET7303_VID) {
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dev_err(&i2c->dev, "vid is not correct, 0x%04x\n", ret);
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return -ENODEV;
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}
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ret = i2c_smbus_read_word_data(i2c, TCPC_PRODUCT_ID);
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if (ret < 0) {
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dev_err(&i2c->dev, "fail to read Product id(%d)\n", ret);
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return ret;
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}
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if (ret != ET7303_PID) {
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dev_err(&i2c->dev, "pid is not correct, 0x%04x\n", ret);
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return -ENODEV;
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}
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return 0;
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}
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static int et7303_probe(struct i2c_client *client,
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const struct i2c_device_id *i2c_id)
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{
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int ret;
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struct et7303_chip *chip;
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ret = et7303_check_revision(client);
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if (ret < 0) {
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dev_err(&client->dev, "check vid/pid fail(%d)\n", ret);
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return ret;
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}
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chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->data.regmap = devm_regmap_init_i2c(client,
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&et7303_regmap_config);
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if (IS_ERR(chip->data.regmap))
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return PTR_ERR(chip->data.regmap);
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chip->dev = &client->dev;
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i2c_set_clientdata(client, chip);
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chip->vbus = devm_regulator_get_optional(chip->dev, "vbus");
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if (IS_ERR(chip->vbus)) {
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ret = PTR_ERR(chip->vbus);
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chip->vbus = NULL;
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if (ret != -ENODEV)
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return ret;
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}
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ret = et7303_sw_reset(chip);
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if (ret < 0)
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return ret;
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/* Disable chip interrupts before requesting irq */
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ret = et7303_write16(chip, TCPC_ALERT_MASK, 0);
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if (ret < 0)
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return ret;
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if (chip->vbus)
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chip->data.set_vbus = et7303_set_vbus;
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chip->data.init = et7303_init;
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chip->data.set_vconn = et7303_set_vconn;
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chip->data.start_drp_toggling = et7303_start_drp_toggling;
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chip->tcpci = tcpci_register_port(chip->dev, &chip->data);
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if (IS_ERR(chip->tcpci))
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return PTR_ERR(chip->tcpci);
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ret = devm_request_threaded_irq(chip->dev, client->irq, NULL,
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et7303_irq,
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IRQF_ONESHOT | IRQF_TRIGGER_LOW,
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client->name, chip);
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if (ret < 0)
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return ret;
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enable_irq_wake(client->irq);
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return 0;
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}
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static int et7303_remove(struct i2c_client *client)
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{
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struct et7303_chip *chip = i2c_get_clientdata(client);
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tcpci_unregister_port(chip->tcpci);
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return 0;
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}
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static const struct i2c_device_id et7303_id[] = {
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{ "et7303", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, et7303_id);
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#ifdef CONFIG_OF
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static const struct of_device_id et7303_of_match[] = {
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{ .compatible = "etek,et7303", },
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{},
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};
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MODULE_DEVICE_TABLE(of, et7303_of_match);
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#endif
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static struct i2c_driver et7303_i2c_driver = {
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.driver = {
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.name = "et7303",
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.of_match_table = of_match_ptr(et7303_of_match),
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},
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.probe = et7303_probe,
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.remove = et7303_remove,
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.id_table = et7303_id,
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};
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module_i2c_driver(et7303_i2c_driver);
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MODULE_AUTHOR("Wang Jie <dave.wang@rock-chips.com>");
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MODULE_DESCRIPTION("ET7303 USB Type-C Port Controller Interface Driver");
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MODULE_LICENSE("GPL");
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