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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018, Richtek Technology Corporation
*
* Richtek RT1711H Type-C Chip Driver
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/gpio/consumer.h>
#include <linux/usb/tcpm.h>
#include <linux/regmap.h>
#include "tcpci.h"
#define RT1711H_VID 0x29CF
#define RT1711H_PID 0x1711
#define RT1711H_RTCTRL8 0x9B
/* Autoidle timeout = (tout * 2 + 1) * 6.4ms */
#define RT1711H_RTCTRL8_SET(ck300, ship_off, auto_idle, tout) \
(((ck300) << 7) | ((ship_off) << 5) | \
((auto_idle) << 3) | ((tout) & 0x07))
#define RT1711H_RTCTRL11 0x9E
/* I2C timeout = (tout + 1) * 12.5ms */
#define RT1711H_RTCTRL11_SET(en, tout) \
(((en) << 7) | ((tout) & 0x0F))
#define RT1711H_RTCTRL13 0xA0
#define RT1711H_RTCTRL14 0xA1
#define RT1711H_RTCTRL15 0xA2
#define RT1711H_RTCTRL16 0xA3
struct rt1711h_chip {
struct tcpci_data data;
struct tcpci *tcpci;
struct device *dev;
};
static int rt1711h_read16(struct rt1711h_chip *chip, unsigned int reg, u16 *val)
{
return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u16));
}
static int rt1711h_write16(struct rt1711h_chip *chip, unsigned int reg, u16 val)
{
return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u16));
}
static int rt1711h_read8(struct rt1711h_chip *chip, unsigned int reg, u8 *val)
{
return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u8));
}
static int rt1711h_write8(struct rt1711h_chip *chip, unsigned int reg, u8 val)
{
return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u8));
}
static const struct regmap_config rt1711h_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0xFF, /* 0x80 .. 0xFF are vendor defined */
};
static struct rt1711h_chip *tdata_to_rt1711h(struct tcpci_data *tdata)
{
return container_of(tdata, struct rt1711h_chip, data);
}
static int rt1711h_init(struct tcpci *tcpci, struct tcpci_data *tdata)
{
int ret;
struct rt1711h_chip *chip = tdata_to_rt1711h(tdata);
/* CK 300K from 320K, shipping off, auto_idle enable, tout = 32ms */
ret = rt1711h_write8(chip, RT1711H_RTCTRL8,
RT1711H_RTCTRL8_SET(0, 1, 1, 2));
if (ret < 0)
return ret;
/* I2C reset : (val + 1) * 12.5ms */
ret = rt1711h_write8(chip, RT1711H_RTCTRL11,
RT1711H_RTCTRL11_SET(1, 0x0F));
if (ret < 0)
return ret;
/* tTCPCfilter : (26.7 * val) us */
ret = rt1711h_write8(chip, RT1711H_RTCTRL14, 0x0F);
if (ret < 0)
return ret;
/* tDRP : (51.2 + 6.4 * val) ms */
ret = rt1711h_write8(chip, RT1711H_RTCTRL15, 0x04);
if (ret < 0)
return ret;
/* dcSRC.DRP : 33% */
return rt1711h_write16(chip, RT1711H_RTCTRL16, 330);
}
static int rt1711h_set_vconn(struct tcpci *tcpci, struct tcpci_data *tdata,
bool enable)
{
struct rt1711h_chip *chip = tdata_to_rt1711h(tdata);
return rt1711h_write8(chip, RT1711H_RTCTRL8,
RT1711H_RTCTRL8_SET(0, 1, !enable, 2));
}
static int rt1711h_start_drp_toggling(struct tcpci *tcpci,
struct tcpci_data *tdata,
enum typec_cc_status cc)
{
struct rt1711h_chip *chip = tdata_to_rt1711h(tdata);
int ret;
unsigned int reg = 0;
switch (cc) {
default:
case TYPEC_CC_RP_DEF:
reg |= (TCPC_ROLE_CTRL_RP_VAL_DEF <<
TCPC_ROLE_CTRL_RP_VAL_SHIFT);
break;
case TYPEC_CC_RP_1_5:
reg |= (TCPC_ROLE_CTRL_RP_VAL_1_5 <<
TCPC_ROLE_CTRL_RP_VAL_SHIFT);
break;
case TYPEC_CC_RP_3_0:
reg |= (TCPC_ROLE_CTRL_RP_VAL_3_0 <<
TCPC_ROLE_CTRL_RP_VAL_SHIFT);
break;
}
if (cc == TYPEC_CC_RD)
reg |= (TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC1_SHIFT) |
(TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC2_SHIFT);
else
reg |= (TCPC_ROLE_CTRL_CC_RP << TCPC_ROLE_CTRL_CC1_SHIFT) |
(TCPC_ROLE_CTRL_CC_RP << TCPC_ROLE_CTRL_CC2_SHIFT);
ret = rt1711h_write8(chip, TCPC_ROLE_CTRL, reg);
if (ret < 0)
return ret;
usleep_range(500, 1000);
return 0;
}
static irqreturn_t rt1711h_irq(int irq, void *dev_id)
{
int ret;
u16 alert;
u8 status;
struct rt1711h_chip *chip = dev_id;
if (!chip->tcpci)
return IRQ_HANDLED;
ret = rt1711h_read16(chip, TCPC_ALERT, &alert);
if (ret < 0)
goto out;
if (alert & TCPC_ALERT_CC_STATUS) {
ret = rt1711h_read8(chip, TCPC_CC_STATUS, &status);
if (ret < 0)
goto out;
/* Clear cc change event triggered by starting toggling */
if (status & TCPC_CC_STATUS_TOGGLING)
rt1711h_write8(chip, TCPC_ALERT, TCPC_ALERT_CC_STATUS);
}
out:
return tcpci_irq(chip->tcpci);
}
static int rt1711h_sw_reset(struct rt1711h_chip *chip)
{
int ret;
ret = rt1711h_write8(chip, RT1711H_RTCTRL13, 0x01);
if (ret < 0)
return ret;
usleep_range(1000, 2000);
return 0;
}
static int rt1711h_check_revision(struct i2c_client *i2c)
{
int ret;
ret = i2c_smbus_read_word_data(i2c, TCPC_VENDOR_ID);
if (ret < 0)
return ret;
if (ret != RT1711H_VID) {
dev_err(&i2c->dev, "vid is not correct, 0x%04x\n", ret);
return -ENODEV;
}
ret = i2c_smbus_read_word_data(i2c, TCPC_PRODUCT_ID);
if (ret < 0)
return ret;
if (ret != RT1711H_PID) {
dev_err(&i2c->dev, "pid is not correct, 0x%04x\n", ret);
return -ENODEV;
}
return 0;
}
static int rt1711h_probe(struct i2c_client *client,
const struct i2c_device_id *i2c_id)
{
int ret;
struct rt1711h_chip *chip;
ret = rt1711h_check_revision(client);
if (ret < 0) {
dev_err(&client->dev, "check vid/pid fail\n");
return ret;
}
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->data.regmap = devm_regmap_init_i2c(client,
&rt1711h_regmap_config);
if (IS_ERR(chip->data.regmap))
return PTR_ERR(chip->data.regmap);
chip->dev = &client->dev;
i2c_set_clientdata(client, chip);
ret = rt1711h_sw_reset(chip);
if (ret < 0)
return ret;
/* Disable chip interrupts before requesting irq */
ret = rt1711h_write16(chip, TCPC_ALERT_MASK, 0);
if (ret < 0)
return ret;
chip->data.init = rt1711h_init;
chip->data.set_vconn = rt1711h_set_vconn;
chip->data.start_drp_toggling = rt1711h_start_drp_toggling;
chip->tcpci = tcpci_register_port(chip->dev, &chip->data);
if (IS_ERR_OR_NULL(chip->tcpci))
return PTR_ERR(chip->tcpci);
ret = devm_request_threaded_irq(chip->dev, client->irq, NULL,
rt1711h_irq,
IRQF_ONESHOT | IRQF_TRIGGER_LOW,
dev_name(chip->dev), chip);
if (ret < 0)
return ret;
enable_irq_wake(client->irq);
return 0;
}
static int rt1711h_remove(struct i2c_client *client)
{
struct rt1711h_chip *chip = i2c_get_clientdata(client);
tcpci_unregister_port(chip->tcpci);
return 0;
}
static const struct i2c_device_id rt1711h_id[] = {
{ "rt1711h", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, rt1711h_id);
#ifdef CONFIG_OF
static const struct of_device_id rt1711h_of_match[] = {
{ .compatible = "richtek,rt1711h", },
{},
};
MODULE_DEVICE_TABLE(of, rt1711h_of_match);
#endif
static struct i2c_driver rt1711h_i2c_driver = {
.driver = {
.name = "rt1711h",
.of_match_table = of_match_ptr(rt1711h_of_match),
},
.probe = rt1711h_probe,
.remove = rt1711h_remove,
.id_table = rt1711h_id,
};
module_i2c_driver(rt1711h_i2c_driver);
MODULE_AUTHOR("ShuFan Lee <shufan_lee@richtek.com>");
MODULE_DESCRIPTION("RT1711H USB Type-C Port Controller Interface Driver");
MODULE_LICENSE("GPL");
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