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Message-ID: <20200616125007.GM3213128@kuha.fi.intel.com>
Date: Tue, 16 Jun 2020 15:50:07 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Amelie Delaunay <amelie.delaunay@...com>
Cc: Rob Herring <robh+dt@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...com>,
Russell King <linux@...linux.org.uk>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org,
Fabrice Gasnier <fabrice.gasnier@...com>
Subject: Re: [PATCH 4/6] usb: typec: add support for STUSB160x Type-C
controller family
On Mon, Jun 15, 2020 at 06:15:10PM +0200, Amelie Delaunay wrote:
> STMicroelectronics USB Type-C port controllers use I2C interface to
> configure, control and read the operation status of the device. All ST USB
> Type-C port controllers are based on the same I2C register map. That's why
> this driver can be used with all ST USB Type-C ICs.
> Some ST USB Type-C port controllers are Dual Role Port (DRP), only Sink or
> Source, some supports USB Power Delivery. This can be configured through
> connector device tree bindings.
>
> This driver is a basic Type-C port controller driver, with no power
> delivery support. It allows to configure ST USB Type-C port controller.
> Interrupt is supported and enables CC connection events, to detect
> attach and detach and update Type-C subsystem accordingly as well as usb
> role switch.
>
> ST USB Type-C port controller can be supplied in three different ways
> depending on the target application:
> - through VDD pin only (so VDD is the main supply)
> - through VSYS pin only (so VSYS is the main supply)
> - through VDD and VSYS pins.
> When both VDD and VSYS power supplies are present, the low power supply
> VSYS is selected as main supply when VSYS voltage is above 3.1V, else
> VDD is selected as main supply.
>
> In case of Source or Dual port type, if VDD supply is present, it has to be
> enabled in case of Source power role to provide Vbus. When interrupt
> support is available, VDD supply is dynamically managed upon attach/detach
> interrupt. When there is no interrupt support, VDD supply is enabled by
> default.
>
> Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
> drivers/usb/typec/Kconfig | 12 +
> drivers/usb/typec/Makefile | 1 +
> drivers/usb/typec/stusb160x.c | 875 ++++++++++++++++++++++++++++++++++
> 3 files changed, 888 insertions(+)
> create mode 100644 drivers/usb/typec/stusb160x.c
>
> diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig
> index 559dd06117e7..eee8536ae600 100644
> --- a/drivers/usb/typec/Kconfig
> +++ b/drivers/usb/typec/Kconfig
> @@ -73,6 +73,18 @@ config TYPEC_TPS6598X
> If you choose to build this driver as a dynamically linked module, the
> module will be called tps6598x.ko.
>
> +config TYPEC_STUSB160X
> + tristate "STMicroelectronics STUSB160x Type-C controller driver"
> + depends on I2C
> + depends on REGMAP_I2C
> + depends on USB_ROLE_SWITCH || !USB_ROLE_SWITCH
> + help
> + Say Y or M here if your system has STMicroelectronics STUSB160x
> + Type-C port controller.
> +
> + If you choose to build this driver as a dynamically linked module, the
> + module will be called stusb160x.ko.
> +
> source "drivers/usb/typec/mux/Kconfig"
>
> source "drivers/usb/typec/altmodes/Kconfig"
> diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile
> index 7753a5c3cd46..671bc2d3cd6a 100644
> --- a/drivers/usb/typec/Makefile
> +++ b/drivers/usb/typec/Makefile
> @@ -6,4 +6,5 @@ obj-$(CONFIG_TYPEC_TCPM) += tcpm/
> obj-$(CONFIG_TYPEC_UCSI) += ucsi/
> obj-$(CONFIG_TYPEC_HD3SS3220) += hd3ss3220.o
> obj-$(CONFIG_TYPEC_TPS6598X) += tps6598x.o
> +obj-$(CONFIG_TYPEC_STUSB160X) += stusb160x.o
> obj-$(CONFIG_TYPEC) += mux/
> diff --git a/drivers/usb/typec/stusb160x.c b/drivers/usb/typec/stusb160x.c
> new file mode 100644
> index 000000000000..ce0bd7b3ad88
> --- /dev/null
> +++ b/drivers/usb/typec/stusb160x.c
> @@ -0,0 +1,875 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * STMicroelectronics STUSB160x Type-C controller family driver
> + *
> + * Copyright (C) 2020, STMicroelectronics
> + * Author(s): Amelie Delaunay <amelie.delaunay@...com>
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/usb/role.h>
> +#include <linux/usb/typec.h>
> +
> +#define STUSB160X_ALERT_STATUS 0x0B /* RC */
> +#define STUSB160X_ALERT_STATUS_MASK_CTRL 0x0C /* RW */
> +#define STUSB160X_CC_CONNECTION_STATUS_TRANS 0x0D /* RC */
> +#define STUSB160X_CC_CONNECTION_STATUS 0x0E /* RO */
> +#define STUSB160X_MONITORING_STATUS_TRANS 0x0F /* RC */
> +#define STUSB160X_MONITORING_STATUS 0x10 /* RO */
> +#define STUSB160X_CC_OPERATION_STATUS 0x11 /* RO */
> +#define STUSB160X_HW_FAULT_STATUS_TRANS 0x12 /* RC */
> +#define STUSB160X_HW_FAULT_STATUS 0x13 /* RO */
> +#define STUSB160X_CC_CAPABILITY_CTRL 0x18 /* RW */
> +#define STUSB160X_CC_VCONN_SWITCH_CTRL 0x1E /* RW */
> +#define STUSB160X_VCONN_MONITORING_CTRL 0x20 /* RW */
> +#define STUSB160X_VBUS_MONITORING_RANGE_CTRL 0x22 /* RW */
> +#define STUSB160X_RESET_CTRL 0x23 /* RW */
> +#define STUSB160X_VBUS_DISCHARGE_TIME_CTRL 0x25 /* RW */
> +#define STUSB160X_VBUS_DISCHARGE_STATUS 0x26 /* RO */
> +#define STUSB160X_VBUS_ENABLE_STATUS 0x27 /* RO */
> +#define STUSB160X_CC_POWER_MODE_CTRL 0x28 /* RW */
> +#define STUSB160X_VBUS_MONITORING_CTRL 0x2E /* RW */
> +#define STUSB1600_REG_MAX 0x2F /* RO - Reserved */
> +
> +/* STUSB160X_ALERT_STATUS/STUSB160X_ALERT_STATUS_MASK_CTRL bitfields */
> +#define STUSB160X_HW_FAULT BIT(4)
> +#define STUSB160X_MONITORING BIT(5)
> +#define STUSB160X_CC_CONNECTION BIT(6)
> +#define STUSB160X_ALL_ALERTS GENMASK(6, 4)
> +
> +/* STUSB160X_CC_CONNECTION_STATUS_TRANS bitfields */
> +#define STUSB160X_CC_ATTACH_TRANS BIT(0)
> +
> +/* STUSB160X_CC_CONNECTION_STATUS bitfields */
> +#define STUSB160X_CC_ATTACH BIT(0)
> +#define STUSB160X_CC_VCONN_SUPPLY BIT(1)
> +#define STUSB160X_CC_DATA_ROLE(s) (!!((s) & BIT(2)))
> +#define STUSB160X_CC_POWER_ROLE(s) (!!((s) & BIT(3)))
> +#define STUSB160X_CC_ATTACHED_MODE GENMASK(7, 5)
> +
> +/* STUSB160X_MONITORING_STATUS_TRANS bitfields */
> +#define STUSB160X_VCONN_PRESENCE_TRANS BIT(0)
> +#define STUSB160X_VBUS_PRESENCE_TRANS BIT(1)
> +#define STUSB160X_VBUS_VSAFE0V_TRANS BIT(2)
> +#define STUSB160X_VBUS_VALID_TRANS BIT(3)
> +
> +/* STUSB160X_MONITORING_STATUS bitfields */
> +#define STUSB160X_VCONN_PRESENCE BIT(0)
> +#define STUSB160X_VBUS_PRESENCE BIT(1)
> +#define STUSB160X_VBUS_VSAFE0V BIT(2)
> +#define STUSB160X_VBUS_VALID BIT(3)
> +
> +/* STUSB160X_CC_OPERATION_STATUS bitfields */
> +#define STUSB160X_TYPEC_FSM_STATE GENMASK(4, 0)
> +#define STUSB160X_SINK_POWER_STATE GENMASK(6, 5)
> +#define STUSB160X_CC_ATTACHED BIT(7)
> +
> +/* STUSB160X_HW_FAULT_STATUS_TRANS bitfields */
> +#define STUSB160X_VCONN_SW_OVP_FAULT_TRANS BIT(0)
> +#define STUSB160X_VCONN_SW_OCP_FAULT_TRANS BIT(1)
> +#define STUSB160X_VCONN_SW_RVP_FAULT_TRANS BIT(2)
> +#define STUSB160X_VPU_VALID_TRANS BIT(4)
> +#define STUSB160X_VPU_OVP_FAULT_TRANS BIT(5)
> +#define STUSB160X_THERMAL_FAULT BIT(7)
> +
> +/* STUSB160X_HW_FAULT_STATUS bitfields */
> +#define STUSB160X_VCONN_SW_OVP_FAULT_CC2 BIT(0)
> +#define STUSB160X_VCONN_SW_OVP_FAULT_CC1 BIT(1)
> +#define STUSB160X_VCONN_SW_OCP_FAULT_CC2 BIT(2)
> +#define STUSB160X_VCONN_SW_OCP_FAULT_CC1 BIT(3)
> +#define STUSB160X_VCONN_SW_RVP_FAULT_CC2 BIT(4)
> +#define STUSB160X_VCONN_SW_RVP_FAULT_CC1 BIT(5)
> +#define STUSB160X_VPU_VALID BIT(6)
> +#define STUSB160X_VPU_OVP_FAULT BIT(7)
> +
> +/* STUSB160X_CC_CAPABILITY_CTRL bitfields */
> +#define STUSB160X_CC_VCONN_SUPPLY_EN BIT(0)
> +#define STUSB160X_CC_VCONN_DISCHARGE_EN BIT(4)
> +#define STUSB160X_CC_CURRENT_ADVERTISED GENMASK(7, 6)
> +
> +/* STUSB160X_VCONN_SWITCH_CTRL bitfields */
> +#define STUSB160X_CC_VCONN_SWITCH_ILIM GENMASK(3, 0)
> +
> +/* STUSB160X_VCONN_MONITORING_CTRL bitfields */
> +#define STUSB160X_VCONN_UVLO_THRESHOLD BIT(6)
> +#define STUSB160X_VCONN_MONITORING_EN BIT(7)
> +
> +/* STUSB160X_VBUS_MONITORING_RANGE_CTRL bitfields */
> +#define STUSB160X_SHIFT_LOW_VBUS_LIMIT GENMASK(3, 0)
> +#define STUSB160X_SHIFT_HIGH_VBUS_LIMIT GENMASK(7, 4)
> +
> +/* STUSB160X_RESET_CTRL bitfields */
> +#define STUSB160X_SW_RESET_EN BIT(0)
> +
> +/* STUSB160X_VBUS_DISCHARGE_TIME_CTRL bitfields */
> +#define STUSBXX02_VBUS_DISCHARGE_TIME_TO_PDO GENMASK(3, 0)
> +#define STUSB160X_VBUS_DISCHARGE_TIME_TO_0V GENMASK(7, 4)
> +
> +/* STUSB160X_VBUS_DISCHARGE_STATUS bitfields */
> +#define STUSB160X_VBUS_DISCHARGE_EN BIT(7)
> +
> +/* STUSB160X_VBUS_ENABLE_STATUS bitfields */
> +#define STUSB160X_VBUS_SOURCE_EN BIT(0)
> +#define STUSB160X_VBUS_SINK_EN BIT(1)
> +
> +/* STUSB160X_CC_POWER_MODE_CTRL bitfields */
> +#define STUSB160X_CC_POWER_MODE GENMASK(2, 0)
> +
> +/* STUSB160X_VBUS_MONITORING_CTRL bitfields */
> +#define STUSB160X_VDD_UVLO_DISABLE BIT(0)
> +#define STUSB160X_VBUS_VSAFE0V_THRESHOLD GENMASK(2, 1)
> +#define STUSB160X_VBUS_RANGE_DISABLE BIT(4)
> +#define STUSB160X_VDD_OVLO_DISABLE BIT(6)
> +
> +enum stusb160x_pwr_mode {
> + SOURCE_WITH_ACCESSORY,
> + SINK_WITH_ACCESSORY,
> + SINK_WITHOUT_ACCESSORY,
> + DUAL_WITH_ACCESSORY,
> + DUAL_WITH_ACCESSORY_AND_TRY_SRC,
> + DUAL_WITH_ACCESSORY_AND_TRY_SNK,
> +};
> +
> +enum stusb160x_attached_mode {
> + NO_DEVICE_ATTACHED,
> + SINK_ATTACHED,
> + SOURCE_ATTACHED,
> + DEBUG_ACCESSORY_ATTACHED,
> + AUDIO_ACCESSORY_ATTACHED,
> +};
> +
> +struct stusb160x {
> + struct device *dev;
> + struct regmap *regmap;
> + struct regulator *vdd_supply;
> + struct regulator *vsys_supply;
> + struct regulator *vconn_supply;
> + struct regulator *main_supply;
> +
> + struct typec_port *port;
> + struct typec_capability capability;
> + struct typec_partner *partner;
> +
> + enum typec_port_type port_type;
> + enum typec_pwr_opmode pwr_opmode;
> + bool vbus_on;
> +
> + struct usb_role_switch *role_sw;
> +};
> +
> +static bool stusb160x_reg_writeable(struct device *dev, unsigned int reg)
> +{
> + switch (reg) {
> + case STUSB160X_ALERT_STATUS_MASK_CTRL:
> + case STUSB160X_CC_CAPABILITY_CTRL:
> + case STUSB160X_CC_VCONN_SWITCH_CTRL:
> + case STUSB160X_VCONN_MONITORING_CTRL:
> + case STUSB160X_VBUS_MONITORING_RANGE_CTRL:
> + case STUSB160X_RESET_CTRL:
> + case STUSB160X_VBUS_DISCHARGE_TIME_CTRL:
> + case STUSB160X_CC_POWER_MODE_CTRL:
> + case STUSB160X_VBUS_MONITORING_CTRL:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static bool stusb160x_reg_readable(struct device *dev, unsigned int reg)
> +{
> + if (reg <= 0x0A ||
> + (reg >= 0x14 && reg <= 0x17) ||
> + (reg >= 0x19 && reg <= 0x1D) ||
> + (reg >= 0x29 && reg <= 0x2D) ||
> + (reg == 0x1F || reg == 0x21 || reg == 0x24 || reg == 0x2F))
> + return false;
> + else
> + return true;
> +}
> +
> +static bool stusb160x_reg_volatile(struct device *dev, unsigned int reg)
> +{
> + switch (reg) {
> + case STUSB160X_ALERT_STATUS:
> + case STUSB160X_CC_CONNECTION_STATUS_TRANS:
> + case STUSB160X_CC_CONNECTION_STATUS:
> + case STUSB160X_MONITORING_STATUS_TRANS:
> + case STUSB160X_MONITORING_STATUS:
> + case STUSB160X_CC_OPERATION_STATUS:
> + case STUSB160X_HW_FAULT_STATUS_TRANS:
> + case STUSB160X_HW_FAULT_STATUS:
> + case STUSB160X_VBUS_DISCHARGE_STATUS:
> + case STUSB160X_VBUS_ENABLE_STATUS:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static bool stusb160x_reg_precious(struct device *dev, unsigned int reg)
> +{
> + switch (reg) {
> + case STUSB160X_ALERT_STATUS:
> + case STUSB160X_CC_CONNECTION_STATUS_TRANS:
> + case STUSB160X_MONITORING_STATUS_TRANS:
> + case STUSB160X_HW_FAULT_STATUS_TRANS:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static const struct regmap_config stusb1600_regmap_config = {
> + .reg_bits = 8,
> + .reg_stride = 1,
> + .val_bits = 8,
> + .max_register = STUSB1600_REG_MAX,
> + .writeable_reg = stusb160x_reg_writeable,
> + .readable_reg = stusb160x_reg_readable,
> + .volatile_reg = stusb160x_reg_volatile,
> + .precious_reg = stusb160x_reg_precious,
> + .cache_type = REGCACHE_RBTREE,
> +};
> +
> +static bool stusb160x_get_vconn(struct stusb160x *chip)
> +{
> + u32 val;
> + int ret;
> +
> + ret = regmap_read(chip->regmap, STUSB160X_CC_CAPABILITY_CTRL, &val);
> + if (ret) {
> + dev_err(chip->dev, "Unable to get Vconn status: %d\n", ret);
> + return false;
> + }
> +
> + return !!FIELD_GET(STUSB160X_CC_VCONN_SUPPLY_EN, val);
> +}
> +
> +static int stusb160x_set_vconn(struct stusb160x *chip, bool on)
> +{
> + int ret;
> +
> + /* Manage VCONN input supply */
> + if (chip->vconn_supply) {
> + if (on) {
> + ret = regulator_enable(chip->vconn_supply);
> + if (ret) {
> + dev_err(chip->dev,
> + "failed to enable vconn supply: %d\n",
> + ret);
> + return ret;
> + }
> + } else {
> + regulator_disable(chip->vconn_supply);
> + }
> + }
> +
> + /* Manage VCONN monitoring and power path */
> + ret = regmap_update_bits(chip->regmap, STUSB160X_VCONN_MONITORING_CTRL,
> + STUSB160X_VCONN_MONITORING_EN,
> + on ? STUSB160X_VCONN_MONITORING_EN : 0);
> + if (ret)
> + goto vconn_reg_disable;
> +
> + return 0;
> +
> +vconn_reg_disable:
> + if (chip->vconn_supply && on)
> + regulator_disable(chip->vconn_supply);
> +
> + return ret;
> +}
> +
> +static enum typec_pwr_opmode stusb160x_get_pwr_opmode(struct stusb160x *chip)
> +{
> + u32 val;
> + int ret;
> +
> + ret = regmap_read(chip->regmap, STUSB160X_CC_CAPABILITY_CTRL, &val);
> + if (ret) {
> + dev_err(chip->dev, "Unable to get pwr opmode: %d\n", ret);
> + return TYPEC_PWR_MODE_USB;
> + }
> +
> + return FIELD_GET(STUSB160X_CC_CURRENT_ADVERTISED, val);
> +}
> +
> +static enum typec_accessory stusb160x_get_accessory(u32 status)
> +{
> + enum stusb160x_attached_mode mode;
> +
> + mode = FIELD_GET(STUSB160X_CC_ATTACHED_MODE, status);
> +
> + switch (mode) {
> + case DEBUG_ACCESSORY_ATTACHED:
> + return TYPEC_ACCESSORY_DEBUG;
> + case AUDIO_ACCESSORY_ATTACHED:
> + return TYPEC_ACCESSORY_AUDIO;
> + default:
> + return TYPEC_ACCESSORY_NONE;
> + }
> +}
> +
> +static enum typec_role stusb160x_get_vconn_role(u32 status)
> +{
> + if (FIELD_GET(STUSB160X_CC_VCONN_SUPPLY, status))
> + return TYPEC_SOURCE;
> +
> + return TYPEC_SINK;
> +}
> +
> +static void stusb160x_set_data_role(struct stusb160x *chip,
> + enum typec_data_role data_role,
> + bool attached)
> +{
> + enum usb_role usb_role = USB_ROLE_NONE;
> +
> + if (attached) {
> + if (data_role == TYPEC_HOST)
> + usb_role = USB_ROLE_HOST;
> + else
> + usb_role = USB_ROLE_DEVICE;
> + }
> +
> + usb_role_switch_set_role(chip->role_sw, usb_role);
> + typec_set_data_role(chip->port, data_role);
> +}
> +
> +static int stusb160x_attach(struct stusb160x *chip, u32 status)
> +{
> + struct typec_partner_desc desc;
> + int ret;
> +
> + if ((STUSB160X_CC_POWER_ROLE(status) == TYPEC_SOURCE) &&
> + chip->vdd_supply) {
> + ret = regulator_enable(chip->vdd_supply);
> + if (ret) {
> + dev_err(chip->dev,
> + "Failed to enable Vbus supply: %d\n", ret);
> + return ret;
> + }
> + chip->vbus_on = true;
> + }
> +
> + desc.usb_pd = false;
> + desc.accessory = stusb160x_get_accessory(status);
> + desc.identity = NULL;
> +
> + chip->partner = typec_register_partner(chip->port, &desc);
> + if (IS_ERR(chip->partner)) {
> + ret = PTR_ERR(chip->partner);
> + goto vbus_disable;
> + }
> +
> + typec_set_pwr_role(chip->port, STUSB160X_CC_POWER_ROLE(status));
> + typec_set_pwr_opmode(chip->port, stusb160x_get_pwr_opmode(chip));
> + typec_set_vconn_role(chip->port, stusb160x_get_vconn_role(status));
> + stusb160x_set_data_role(chip, STUSB160X_CC_DATA_ROLE(status), true);
> +
> + return 0;
> +
> +vbus_disable:
> + if (chip->vbus_on) {
> + regulator_disable(chip->vdd_supply);
> + chip->vbus_on = false;
> + }
> +
> + return ret;
> +}
> +
> +static void stusb160x_detach(struct stusb160x *chip, u32 status)
> +{
> + typec_unregister_partner(chip->partner);
> + chip->partner = NULL;
> +
> + typec_set_pwr_role(chip->port, STUSB160X_CC_POWER_ROLE(status));
> + typec_set_pwr_opmode(chip->port, TYPEC_PWR_MODE_USB);
> + typec_set_vconn_role(chip->port, stusb160x_get_vconn_role(status));
> + stusb160x_set_data_role(chip, STUSB160X_CC_DATA_ROLE(status), false);
> +
> + if (chip->vbus_on) {
> + regulator_disable(chip->vdd_supply);
> + chip->vbus_on = false;
> + }
> +}
> +
> +static irqreturn_t stusb160x_irq_handler(int irq, void *data)
> +{
> + struct stusb160x *chip = data;
> + u32 pending, trans, status;
> + int ret;
> +
> + ret = regmap_read(chip->regmap, STUSB160X_ALERT_STATUS, &pending);
> + if (ret)
> + goto err;
> +
> + if (pending & STUSB160X_CC_CONNECTION) {
> + ret = regmap_read(chip->regmap,
> + STUSB160X_CC_CONNECTION_STATUS_TRANS, &trans);
> + if (ret)
> + goto err;
> + ret = regmap_read(chip->regmap,
> + STUSB160X_CC_CONNECTION_STATUS, &status);
> + if (ret)
> + goto err;
> +
> + if (trans & STUSB160X_CC_ATTACH_TRANS) {
> + if (status & STUSB160X_CC_ATTACH) {
> + ret = stusb160x_attach(chip, status);
> + if (ret)
> + goto err;
> + } else {
> + stusb160x_detach(chip, status);
> + }
> + }
> + }
> +err:
> + return IRQ_HANDLED;
> +}
> +
> +static int stusb160x_irq_init(struct stusb160x *chip, int irq)
> +{
> + u32 status;
> + int ret;
> +
> + ret = regmap_read(chip->regmap,
> + STUSB160X_CC_CONNECTION_STATUS, &status);
> + if (ret)
> + return ret;
> +
> + if (status & STUSB160X_CC_ATTACH) {
> + ret = stusb160x_attach(chip, status);
> + if (ret)
> + dev_err(chip->dev, "attach failed: %d\n", ret);
> + }
> +
> + ret = devm_request_threaded_irq(chip->dev, irq, NULL,
> + stusb160x_irq_handler, IRQF_ONESHOT,
> + dev_name(chip->dev), chip);
> + if (ret)
> + goto partner_unregister;
> +
> + /* Unmask CC_CONNECTION events */
> + ret = regmap_write_bits(chip->regmap, STUSB160X_ALERT_STATUS_MASK_CTRL,
> + STUSB160X_CC_CONNECTION, 0);
> + if (ret)
> + goto partner_unregister;
> +
> + return 0;
> +
> +partner_unregister:
> + if (chip->partner) {
> + typec_unregister_partner(chip->partner);
> + chip->partner = NULL;
> + }
> +
> + return ret;
> +}
> +
> +static int stusb160x_chip_init(struct stusb160x *chip)
> +{
> + u32 val;
> + int ret;
> +
> + /* Change the default Type-C power mode */
> + if (chip->port_type == TYPEC_PORT_SRC)
> + ret = regmap_update_bits(chip->regmap,
> + STUSB160X_CC_POWER_MODE_CTRL,
> + STUSB160X_CC_POWER_MODE,
> + SOURCE_WITH_ACCESSORY);
> + else if (chip->port_type == TYPEC_PORT_SNK)
> + ret = regmap_update_bits(chip->regmap,
> + STUSB160X_CC_POWER_MODE_CTRL,
> + STUSB160X_CC_POWER_MODE,
> + SINK_WITH_ACCESSORY);
> + else /* (chip->port_type == TYPEC_PORT_DRP) */
> + ret = regmap_update_bits(chip->regmap,
> + STUSB160X_CC_POWER_MODE_CTRL,
> + STUSB160X_CC_POWER_MODE,
> + DUAL_WITH_ACCESSORY);
> + if (ret)
> + return ret;
> +
> + if (chip->port_type == TYPEC_PORT_SNK)
> + goto skip_src;
> +
> + /* Change the default Type-C Source power operation mode capability */
> + ret = regmap_update_bits(chip->regmap, STUSB160X_CC_CAPABILITY_CTRL,
> + STUSB160X_CC_CURRENT_ADVERTISED,
> + FIELD_PREP(STUSB160X_CC_CURRENT_ADVERTISED,
> + chip->pwr_opmode));
> + if (ret)
> + return ret;
> +
> + /* Manage Type-C Source Vconn supply */
> + if (stusb160x_get_vconn(chip)) {
> + ret = stusb160x_set_vconn(chip, true);
> + if (ret)
> + return ret;
> + }
> +
> +skip_src:
> + /* Mask all events interrupts - to be unmasked with interrupt support */
> + ret = regmap_update_bits(chip->regmap, STUSB160X_ALERT_STATUS_MASK_CTRL,
> + STUSB160X_ALL_ALERTS, STUSB160X_ALL_ALERTS);
> + if (ret)
> + return ret;
> +
> + /* Read status at least once to clear any stale interrupts */
> + regmap_read(chip->regmap, STUSB160X_ALERT_STATUS, &val);
> + regmap_read(chip->regmap, STUSB160X_CC_CONNECTION_STATUS_TRANS, &val);
> + regmap_read(chip->regmap, STUSB160X_MONITORING_STATUS_TRANS, &val);
> + regmap_read(chip->regmap, STUSB160X_HW_FAULT_STATUS_TRANS, &val);
> +
> + return 0;
> +}
> +
> +static int stusb160x_get_fw_caps(struct stusb160x *chip,
> + struct fwnode_handle *fwnode)
> +{
> + const char *cap_str;
> + int ret;
> +
> + chip->capability.fwnode = fwnode;
> +
> + /*
> + * Supported port type can be configured through device tree
> + * else it is read from chip registers in stusb160x_get_caps.
> + */
> + ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
> + if (!ret) {
> + chip->port_type = typec_find_port_power_role(cap_str);
> + if (chip->port_type < 0) {
> + ret = chip->port_type;
> + return ret;
> + }
> + }
> + chip->capability.type = chip->port_type;
> +
> + /* Skip DRP/Source capabilities in case of Sink only */
> + if (chip->port_type == TYPEC_PORT_SNK)
> + return 0;
> +
> + if (chip->port_type == TYPEC_PORT_DRP)
> + chip->capability.prefer_role = TYPEC_SINK;
> +
> + /*
> + * Supported power operation mode can be configured through device tree
> + * else it is read from chip registers in stusb160x_get_caps.
> + */
> + ret = fwnode_property_read_string(fwnode, "power-opmode", &cap_str);
> + if (!ret) {
> + chip->pwr_opmode = typec_find_pwr_opmode(cap_str);
> + /* Power delivery not yet supported */
> + if (chip->pwr_opmode < 0 ||
> + chip->pwr_opmode == TYPEC_PWR_MODE_PD) {
> + ret = chip->pwr_opmode < 0 ? chip->pwr_opmode : -EINVAL;
> + dev_err(chip->dev, "bad power operation mode: %d\n",
> + chip->pwr_opmode);
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int stusb160x_get_caps(struct stusb160x *chip)
> +{
> + enum typec_port_type *type = &chip->capability.type;
> + enum typec_port_data *data = &chip->capability.data;
> + enum typec_accessory *accessory = chip->capability.accessory;
> + u32 val;
> + int ret;
> +
> + chip->capability.revision = USB_TYPEC_REV_1_2;
> +
> + ret = regmap_read(chip->regmap, STUSB160X_CC_POWER_MODE_CTRL, &val);
> + if (ret)
> + return ret;
> +
> + switch (FIELD_GET(STUSB160X_CC_POWER_MODE, val)) {
> + case SOURCE_WITH_ACCESSORY:
> + *type = TYPEC_PORT_SRC;
> + *data = TYPEC_PORT_DFP;
> + *accessory++ = TYPEC_ACCESSORY_AUDIO;
> + *accessory++ = TYPEC_ACCESSORY_DEBUG;
> + break;
> + case SINK_WITH_ACCESSORY:
> + *type = TYPEC_PORT_SNK;
> + *data = TYPEC_PORT_UFP;
> + *accessory++ = TYPEC_ACCESSORY_AUDIO;
> + *accessory++ = TYPEC_ACCESSORY_DEBUG;
> + break;
> + case SINK_WITHOUT_ACCESSORY:
> + *type = TYPEC_PORT_SNK;
> + *data = TYPEC_PORT_UFP;
> + break;
> + case DUAL_WITH_ACCESSORY:
> + case DUAL_WITH_ACCESSORY_AND_TRY_SRC:
> + case DUAL_WITH_ACCESSORY_AND_TRY_SNK:
> + *type = TYPEC_PORT_DRP;
> + *data = TYPEC_PORT_DRD;
> + *accessory++ = TYPEC_ACCESSORY_AUDIO;
> + *accessory++ = TYPEC_ACCESSORY_DEBUG;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + chip->port_type = *type;
> + chip->pwr_opmode = stusb160x_get_pwr_opmode(chip);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id stusb160x_of_match[] = {
> + { .compatible = "st,stusb1600", .data = &stusb1600_regmap_config},
> + {},
> +};
> +
> +static int stusb160x_probe(struct i2c_client *client)
> +{
> + struct stusb160x *chip;
> + const struct of_device_id *match;
> + struct regmap_config *regmap_config;
> + struct fwnode_handle *fwnode;
> + int ret;
> +
> + chip = devm_kzalloc(&client->dev, sizeof(struct stusb160x), GFP_KERNEL);
> + if (!chip)
> + return -ENOMEM;
> +
> + i2c_set_clientdata(client, chip);
> +
> + match = i2c_of_match_device(stusb160x_of_match, client);
> + regmap_config = (struct regmap_config *)match->data;
> + chip->regmap = devm_regmap_init_i2c(client, regmap_config);
> + if (IS_ERR(chip->regmap)) {
> + ret = PTR_ERR(chip->regmap);
> + dev_err(&client->dev,
> + "Failed to allocate register map:%d\n", ret);
> + return ret;
> + }
> +
> + chip->dev = &client->dev;
> +
> + chip->vsys_supply = devm_regulator_get_optional(chip->dev, "vsys");
> + if (IS_ERR(chip->vsys_supply)) {
> + ret = PTR_ERR(chip->vsys_supply);
> + if (ret != -ENODEV)
> + return ret;
> + chip->vsys_supply = NULL;
> + }
> +
> + chip->vdd_supply = devm_regulator_get_optional(chip->dev, "vdd");
> + if (IS_ERR(chip->vdd_supply)) {
> + ret = PTR_ERR(chip->vdd_supply);
> + if (ret != -ENODEV)
> + return ret;
> + chip->vdd_supply = NULL;
> + }
> +
> + chip->vconn_supply = devm_regulator_get_optional(chip->dev, "vconn");
> + if (IS_ERR(chip->vconn_supply)) {
> + ret = PTR_ERR(chip->vconn_supply);
> + if (ret != -ENODEV)
> + return ret;
> + chip->vconn_supply = NULL;
> + }
> +
> + fwnode = device_get_named_child_node(chip->dev, "connector");
> + if (IS_ERR(fwnode))
> + return PTR_ERR(fwnode);
> +
> + /*
> + * When both VDD and VSYS power supplies are present, the low power
> + * supply VSYS is selected when VSYS voltage is above 3.1 V.
> + * Otherwise VDD is selected.
> + */
> + if (chip->vdd_supply &&
> + (!chip->vsys_supply ||
> + (regulator_get_voltage(chip->vsys_supply) <= 3100000)))
> + chip->main_supply = chip->vdd_supply;
> + else
> + chip->main_supply = chip->vsys_supply;
> +
> + if (chip->main_supply) {
> + ret = regulator_enable(chip->main_supply);
> + if (ret) {
> + dev_err(chip->dev,
> + "Failed to enable main supply: %d\n", ret);
> + goto fwnode_put;
> + }
> + }
> +
> + /* Get configuration from chip */
> + ret = stusb160x_get_caps(chip);
> + if (ret) {
> + dev_err(chip->dev, "Failed to get port caps: %d\n", ret);
> + goto main_reg_disable;
> + }
> +
> + /* Get optional re-configuration from device tree */
> + ret = stusb160x_get_fw_caps(chip, fwnode);
> + if (ret) {
> + dev_err(chip->dev, "Failed to get connector caps: %d\n", ret);
> + goto main_reg_disable;
> + }
> +
> + ret = stusb160x_chip_init(chip);
> + if (ret) {
> + dev_err(chip->dev, "Failed to init port: %d\n", ret);
> + goto main_reg_disable;
> + }
> +
> + chip->port = typec_register_port(chip->dev, &chip->capability);
> + if (!chip->port) {
> + ret = -ENODEV;
> + goto all_reg_disable;
> + }
> +
> + /*
> + * Default power operation mode initialization: will be updated upon
> + * attach/detach interrupt
> + */
> + typec_set_pwr_opmode(chip->port, chip->pwr_opmode);
> +
> + if (client->irq) {
> + ret = stusb160x_irq_init(chip, client->irq);
> + if (ret)
> + goto port_unregister;
> +
> + chip->role_sw = fwnode_usb_role_switch_get(fwnode);
> + if (IS_ERR(chip->role_sw)) {
> + ret = PTR_ERR(chip->role_sw);
> + if (ret != -EPROBE_DEFER)
> + dev_err(chip->dev,
> + "Failed to get usb role switch: %d\n",
> + ret);
> + goto port_unregister;
> + }
> + } else {
> + /*
> + * If Source or Dual power role, need to enable VDD supply
> + * providing Vbus if present. In case of interrupt support,
> + * VDD supply will be dynamically managed upon attach/detach
> + * interrupt.
> + */
> + if (chip->port_type != TYPEC_PORT_SNK && chip->vdd_supply) {
> + ret = regulator_enable(chip->vdd_supply);
> + if (ret) {
> + dev_err(chip->dev,
> + "Failed to enable VDD supply: %d\n",
> + ret);
> + goto port_unregister;
> + }
> + chip->vbus_on = true;
> + }
> + }
> +
> + fwnode_handle_put(fwnode);
> +
> + return 0;
> +
> +port_unregister:
> + typec_unregister_port(chip->port);
> +all_reg_disable:
> + if (stusb160x_get_vconn(chip))
> + stusb160x_set_vconn(chip, false);
> +main_reg_disable:
> + if (chip->main_supply)
> + regulator_disable(chip->main_supply);
> +fwnode_put:
> + fwnode_handle_put(fwnode);
> +
> + return ret;
> +}
> +
> +static int stusb160x_remove(struct i2c_client *client)
> +{
> + struct stusb160x *chip = i2c_get_clientdata(client);
> +
> + if (chip->partner) {
> + typec_unregister_partner(chip->partner);
> + chip->partner = NULL;
> + }
> +
> + if (chip->vbus_on)
> + regulator_disable(chip->vdd_supply);
> +
> + if (chip->role_sw)
> + usb_role_switch_put(chip->role_sw);
> +
> + typec_unregister_port(chip->port);
> +
> + if (stusb160x_get_vconn(chip))
> + stusb160x_set_vconn(chip, false);
> +
> + if (chip->main_supply)
> + regulator_disable(chip->main_supply);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused stusb160x_suspend(struct device *dev)
> +{
> + struct stusb160x *chip = dev_get_drvdata(dev);
> +
> + /* Mask interrupts */
> + return regmap_update_bits(chip->regmap,
> + STUSB160X_ALERT_STATUS_MASK_CTRL,
> + STUSB160X_ALL_ALERTS, STUSB160X_ALL_ALERTS);
> +}
> +
> +static int __maybe_unused stusb160x_resume(struct device *dev)
> +{
> + struct stusb160x *chip = dev_get_drvdata(dev);
> + u32 status;
> + int ret;
> +
> + ret = regcache_sync(chip->regmap);
> + if (ret)
> + return ret;
> +
> + /* Check if attach/detach occurred during low power */
> + ret = regmap_read(chip->regmap,
> + STUSB160X_CC_CONNECTION_STATUS, &status);
> + if (ret)
> + return ret;
> +
> + if (chip->partner && !(status & STUSB160X_CC_ATTACH))
> + stusb160x_detach(chip, status);
> +
> + if (!chip->partner && (status & STUSB160X_CC_ATTACH)) {
> + ret = stusb160x_attach(chip, status);
> + if (ret)
> + dev_err(chip->dev, "attach failed: %d\n", ret);
> + }
> +
> + /* Unmask interrupts */
> + return regmap_write_bits(chip->regmap, STUSB160X_ALERT_STATUS_MASK_CTRL,
> + STUSB160X_CC_CONNECTION, 0);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(stusb160x_pm_ops, stusb160x_suspend, stusb160x_resume);
> +
> +static struct i2c_driver stusb160x_driver = {
> + .driver = {
> + .name = "stusb160x",
> + .pm = &stusb160x_pm_ops,
> + .of_match_table = stusb160x_of_match,
> + },
> + .probe_new = stusb160x_probe,
> + .remove = stusb160x_remove,
> +};
> +module_i2c_driver(stusb160x_driver);
> +
> +MODULE_AUTHOR("Amelie Delaunay <amelie.delaunay@...com>");
> +MODULE_DESCRIPTION("STMicroelectronics STUSB160x Type-C controller driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.17.1
thanks,
--
heikki
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