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SubjectRe: [PATCH v2] staging: typec: rt1711h typec chip driver
Hi Guenter,

2018-03-17 10:16 GMT+08:00 Guenter Roeck <linux@roeck-us.net>:
> On 03/16/2018 10:40 AM, ShuFan Lee wrote:
>>
>> From: ShuFan Lee <shufan_lee@richtek.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@richtek.com>
>
>
> Does this patch require DT review for the bindings ?
I see Jun is also working on the properties of DTS for TCPCI/TCPM in
his patches.
So, I plan to upload the devicetree binding file when it is ready to
move tcpci_rt1711h out of staging.
Is it OK or should I upload a version first?
>
> 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@richtek.com>");
>> +MODULE_DESCRIPTION("RT1711H USB Type-C Port Controller Interface
>> Driver");
>> +MODULE_LICENSE("GPL");
>>
>



--
Best Regards,
書帆

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