Message-ID: <20200924090049.9041-5-amelie.delaunay@st.com>
Date:   Thu, 24 Sep 2020 11:00:47 +0200
From:   Amelie Delaunay <amelie.delaunay@...com>
To:     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>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
CC:     <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>,
        Amelie Delaunay <amelie.delaunay@...com>,
        Fabrice Gasnier <fabrice.gasnier@...com>
Subject: [PATCH v3 4/6] usb: typec: add support for STUSB160x Type-C controller family

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.

Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
---
No changes in v3.
No changes in v2.
---
 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

Powered by blists - more mailing lists