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Message-ID: <7ebc0dac-db70-3635-27c2-97ce0b5b9f4c@roeck-us.net>
Date: Fri, 16 Mar 2018 19:16:08 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: ShuFan Lee <leechu729@...il.com>, greg@...ah.com,
heikki.krogerus@...ux.intel.com
Cc: shufan_lee@...htek.com, cy_huang@...htek.com, jun.li@....com,
linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2] staging: typec: rt1711h typec chip driver
On 03/16/2018 10:40 AM, ShuFan Lee wrote:
> From: ShuFan Lee <shufan_lee@...htek.com>
>
> Richtek RT1711H Type-C chip driver that works with
> Type-C Port Controller Manager to provide USB PD and
> USB Type-C functionalities.
> Add definition of TCPC_CC_STATUS_TOGGLING.
>
> Signed-off-by: ShuFan Lee <shufan_lee@...htek.com>
Does this patch require DT review for the bindings ?
Gueter
> ---
> drivers/staging/typec/Kconfig | 8 +
> drivers/staging/typec/Makefile | 1 +
> drivers/staging/typec/tcpci.h | 1 +
> drivers/staging/typec/tcpci_rt1711h.c | 329 ++++++++++++++++++++++++++++++++++
> 4 files changed, 339 insertions(+)
> create mode 100644 drivers/staging/typec/tcpci_rt1711h.c
>
> changelogs between v1 and v2
> - use gpiod_* instead of gpio_*
>
> diff --git a/drivers/staging/typec/Kconfig b/drivers/staging/typec/Kconfig
> index 5359f556d203..3aa981fbc8f5 100644
> --- a/drivers/staging/typec/Kconfig
> +++ b/drivers/staging/typec/Kconfig
> @@ -9,6 +9,14 @@ config TYPEC_TCPCI
> help
> Type-C Port Controller driver for TCPCI-compliant controller.
>
> +config TYPEC_RT1711H
> + tristate "Richtek RT1711H Type-C chip driver"
> + select TYPEC_TCPCI
> + help
> + Richtek RT1711H Type-C chip driver that works with
> + Type-C Port Controller Manager to provide USB PD and USB
> + Type-C functionalities.
> +
> endif
>
> endmenu
> diff --git a/drivers/staging/typec/Makefile b/drivers/staging/typec/Makefile
> index 53d649abcb53..7803d485e1b3 100644
> --- a/drivers/staging/typec/Makefile
> +++ b/drivers/staging/typec/Makefile
> @@ -1 +1,2 @@
> obj-$(CONFIG_TYPEC_TCPCI) += tcpci.o
> +obj-$(CONFIG_TYPEC_RT1711H) += tcpci_rt1711h.o
> diff --git a/drivers/staging/typec/tcpci.h b/drivers/staging/typec/tcpci.h
> index 34c865f0dcf6..303ebde26546 100644
> --- a/drivers/staging/typec/tcpci.h
> +++ b/drivers/staging/typec/tcpci.h
> @@ -59,6 +59,7 @@
> #define TCPC_POWER_CTRL_VCONN_ENABLE BIT(0)
>
> #define TCPC_CC_STATUS 0x1d
> +#define TCPC_CC_STATUS_TOGGLING BIT(5)
> #define TCPC_CC_STATUS_TERM BIT(4)
> #define TCPC_CC_STATUS_CC2_SHIFT 2
> #define TCPC_CC_STATUS_CC2_MASK 0x3
> diff --git a/drivers/staging/typec/tcpci_rt1711h.c b/drivers/staging/typec/tcpci_rt1711h.c
> new file mode 100644
> index 000000000000..12afac363d6d
> --- /dev/null
> +++ b/drivers/staging/typec/tcpci_rt1711h.c
> @@ -0,0 +1,329 @@
> +// 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_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;
> + int irq;
> +};
> +
> +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 ? 0 : 1, 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_init_gpio(struct rt1711h_chip *chip)
> +{
> + struct gpio_desc *gpio;
> +
> + gpio = devm_gpiod_get(chip->dev, "rt,intr", GPIOD_IN);
> + if (IS_ERR(gpio))
> + return PTR_ERR(gpio);
> +
> + chip->irq = gpiod_to_irq(gpio);
> + if (chip->irq < 0)
> + return chip->irq;
> + return 0;
> +}
> +
> +static int rt1711h_init_alert(struct rt1711h_chip *chip)
> +{
> + int ret;
> +
> + /* Disable chip interrupts before requesting irq */
> + ret = rt1711h_write16(chip, TCPC_ALERT_MASK, 0);
> + if (ret < 0)
> + return ret;
> +
> + if (!chip->irq) {
> + ret = rt1711h_init_gpio(chip);
> + if (ret < 0)
> + return ret;
> + }
> + ret = devm_request_threaded_irq(chip->dev, chip->irq, NULL,
> + rt1711h_irq,
> + IRQF_ONESHOT | IRQF_TRIGGER_LOW,
> + dev_name(chip->dev), chip);
> + if (ret < 0)
> + return ret;
> + enable_irq_wake(chip->irq);
> + return 0;
> +}
> +
> +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 != 0x29cf) {
> + 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 != 0x1711) {
> + 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->irq = client->irq;
> + chip->dev = &client->dev;
> + i2c_set_clientdata(client, chip);
> +
> + ret = rt1711h_sw_reset(chip);
> + if (ret < 0)
> + return ret;
> +
> + ret = rt1711h_init_alert(chip);
> + 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);
> +
> + 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@...htek.com>");
> +MODULE_DESCRIPTION("RT1711H USB Type-C Port Controller Interface Driver");
> +MODULE_LICENSE("GPL");
>
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