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Subject[PATCH v8 1/4] usb: typec: Add QCOM PMIC typec detection driver
Date
The QCOM SPMI typec driver handles the role and orientation detection, and
notifies client drivers using the USB role switch framework. It registers
as a typec port, so orientation can be communicated using the typec switch
APIs. The driver also attains a handle to the VBUS output regulator, so it
can enable/disable the VBUS source when acting as a host/device.

Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
---
drivers/usb/typec/Kconfig | 12 ++
drivers/usb/typec/Makefile | 1 +
drivers/usb/typec/qcom-pmic-typec.c | 271 ++++++++++++++++++++++++++++
3 files changed, 284 insertions(+)
create mode 100644 drivers/usb/typec/qcom-pmic-typec.c

diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig
index 559dd06117e7..63789cf88fce 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_QCOM_PMIC
+ tristate "Qualcomm PMIC USB Type-C driver"
+ depends on ARCH_QCOM || COMPILE_TEST
+ help
+ Driver for supporting role switch over the Qualcomm PMIC. This will
+ handle the USB Type-C role and orientation detection reported by the
+ QCOM PMIC if the PMIC has the capability to handle USB Type-C
+ detection.
+
+ It will also enable the VBUS output to connected devices when a
+ DFP connection is made.
+
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..cceffd987643 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-$(CONFIG_TYPEC_QCOM_PMIC) += qcom-pmic-typec.o
obj-$(CONFIG_TYPEC) += mux/
diff --git a/drivers/usb/typec/qcom-pmic-typec.c b/drivers/usb/typec/qcom-pmic-typec.c
new file mode 100644
index 000000000000..20b2b6502cb3
--- /dev/null
+++ b/drivers/usb/typec/qcom-pmic-typec.c
@@ -0,0 +1,271 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2020, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/err.h>
+#include <linux/regmap.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/usb/role.h>
+#include <linux/usb/typec_mux.h>
+#include <linux/regulator/consumer.h>
+
+#define TYPEC_MISC_STATUS 0xb
+#define CC_ATTACHED BIT(0)
+#define CC_ORIENTATION BIT(1)
+#define SNK_SRC_MODE BIT(6)
+#define TYPEC_MODE_CFG 0x44
+#define TYPEC_DISABLE_CMD BIT(0)
+#define EN_SNK_ONLY BIT(1)
+#define EN_SRC_ONLY BIT(2)
+#define TYPEC_VCONN_CONTROL 0x46
+#define VCONN_EN_SRC BIT(0)
+#define VCONN_EN_VAL BIT(1)
+#define TYPEC_EXIT_STATE_CFG 0x50
+#define SEL_SRC_UPPER_REF BIT(2)
+#define TYPEC_INTR_EN_CFG_1 0x5e
+#define TYPEC_INTR_EN_CFG_1_MASK GENMASK(7, 0)
+
+struct qcom_pmic_typec {
+ struct device *dev;
+ struct fwnode_handle *fwnode;
+ struct regmap *regmap;
+ u32 base;
+
+ struct typec_capability *cap;
+ struct typec_port *port;
+ struct usb_role_switch *role_sw;
+
+ struct regulator *vbus_reg;
+ bool vbus_enabled;
+};
+
+static void qcom_pmic_typec_enable_vbus_regulator(struct qcom_pmic_typec
+ *qcom_usb, bool enable)
+{
+ int ret;
+
+ if (enable == qcom_usb->vbus_enabled)
+ return;
+
+ if (!qcom_usb->vbus_reg) {
+ qcom_usb->vbus_reg = devm_regulator_get(qcom_usb->dev,
+ "usb_vbus");
+ if (IS_ERR(qcom_usb->vbus_reg)) {
+ qcom_usb->vbus_reg = NULL;
+ return;
+ }
+ }
+
+ if (enable) {
+ ret = regulator_enable(qcom_usb->vbus_reg);
+ if (ret)
+ return;
+ } else {
+ ret = regulator_disable(qcom_usb->vbus_reg);
+ if (ret)
+ return;
+ }
+ qcom_usb->vbus_enabled = enable;
+}
+
+static void qcom_pmic_typec_check_connection(struct qcom_pmic_typec *qcom_usb)
+{
+ enum typec_orientation orientation;
+ enum usb_role role;
+ unsigned int stat;
+ bool enable_vbus;
+
+ regmap_read(qcom_usb->regmap, qcom_usb->base + TYPEC_MISC_STATUS,
+ &stat);
+
+ if (stat & CC_ATTACHED) {
+ orientation = (stat & CC_ORIENTATION) ?
+ TYPEC_ORIENTATION_REVERSE :
+ TYPEC_ORIENTATION_NORMAL;
+ typec_set_orientation(qcom_usb->port, orientation);
+
+ role = (stat & SNK_SRC_MODE) ? USB_ROLE_HOST : USB_ROLE_DEVICE;
+ if (role == USB_ROLE_HOST)
+ enable_vbus = true;
+ else
+ enable_vbus = false;
+ } else {
+ role = USB_ROLE_NONE;
+ enable_vbus = false;
+ }
+
+ qcom_pmic_typec_enable_vbus_regulator(qcom_usb, enable_vbus);
+ usb_role_switch_set_role(qcom_usb->role_sw, role);
+}
+
+static irqreturn_t qcom_pmic_typec_interrupt(int irq, void *_qcom_usb)
+{
+ struct qcom_pmic_typec *qcom_usb = _qcom_usb;
+
+ qcom_pmic_typec_check_connection(qcom_usb);
+ return IRQ_HANDLED;
+}
+
+static void qcom_pmic_typec_typec_hw_init(struct qcom_pmic_typec *qcom_usb)
+{
+ u8 mode = 0;
+
+ regmap_update_bits(qcom_usb->regmap,
+ qcom_usb->base + TYPEC_INTR_EN_CFG_1,
+ TYPEC_INTR_EN_CFG_1_MASK, 0);
+
+ if (qcom_usb->cap->type != TYPEC_PORT_DRP)
+ mode = (qcom_usb->cap->type == TYPEC_PORT_SNK) ?
+ EN_SNK_ONLY : EN_SRC_ONLY;
+ regmap_update_bits(qcom_usb->regmap, qcom_usb->base + TYPEC_MODE_CFG,
+ EN_SNK_ONLY | EN_SRC_ONLY, mode);
+
+ regmap_update_bits(qcom_usb->regmap,
+ qcom_usb->base + TYPEC_VCONN_CONTROL,
+ VCONN_EN_SRC | VCONN_EN_VAL, VCONN_EN_SRC);
+ regmap_update_bits(qcom_usb->regmap,
+ qcom_usb->base + TYPEC_EXIT_STATE_CFG,
+ SEL_SRC_UPPER_REF, SEL_SRC_UPPER_REF);
+}
+
+static int qcom_pmic_typec_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct qcom_pmic_typec *qcom_usb;
+ struct typec_capability *cap;
+ const char *buf;
+ int ret, irq, role;
+ u32 reg;
+
+ ret = device_property_read_u32(dev, "reg", &reg);
+ if (ret < 0) {
+ dev_err(dev, "missing base address\n");
+ return ret;
+ }
+
+ qcom_usb = devm_kzalloc(dev, sizeof(*qcom_usb), GFP_KERNEL);
+ if (!qcom_usb)
+ return -ENOMEM;
+
+ qcom_usb->dev = dev;
+ qcom_usb->base = reg;
+
+ qcom_usb->regmap = dev_get_regmap(dev->parent, NULL);
+ if (!qcom_usb->regmap) {
+ dev_err(dev, "Failed to get regmap\n");
+ return -EINVAL;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return -EINVAL;
+
+ ret = devm_request_threaded_irq(qcom_usb->dev, irq, NULL,
+ qcom_pmic_typec_interrupt, IRQF_ONESHOT,
+ "qcom-pmic-typec", qcom_usb);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not request IRQ\n");
+ return ret;
+ }
+
+ qcom_usb->fwnode = device_get_named_child_node(dev, "connector");
+ if (!qcom_usb->fwnode)
+ return -EINVAL;
+
+ cap = devm_kzalloc(dev, sizeof(*cap), GFP_KERNEL);
+ if (!cap) {
+ ret = -ENOMEM;
+ goto err_put_node;
+ }
+
+ ret = fwnode_property_read_string(qcom_usb->fwnode, "power-role", &buf);
+ if (!ret) {
+ role = typec_find_port_power_role(buf);
+ if (role < 0)
+ role = TYPEC_PORT_SNK;
+ } else {
+ role = TYPEC_PORT_SNK;
+ }
+ cap->type = role;
+
+ ret = fwnode_property_read_string(qcom_usb->fwnode, "data-role", &buf);
+ if (!ret) {
+ role = typec_find_port_data_role(buf);
+ if (role < 0)
+ role = TYPEC_PORT_UFP;
+ } else {
+ role = TYPEC_PORT_UFP;
+ }
+ cap->data = role;
+
+ cap->prefer_role = TYPEC_NO_PREFERRED_ROLE;
+ cap->fwnode = qcom_usb->fwnode;
+ qcom_usb->port = typec_register_port(dev, cap);
+ if (IS_ERR(qcom_usb->port)) {
+ ret = PTR_ERR(qcom_usb->port);
+ dev_err(dev, "Failed to register type c port %d\n", ret);
+ goto err_put_node;
+ }
+
+ qcom_usb->cap = cap;
+
+ qcom_usb->role_sw = fwnode_usb_role_switch_get(qcom_usb->fwnode);
+ if (IS_ERR(qcom_usb->role_sw)) {
+ if (PTR_ERR(qcom_usb->role_sw) != -EPROBE_DEFER)
+ dev_err(dev, "failed to get role switch\n");
+ ret = PTR_ERR(qcom_usb->role_sw);
+ goto err_typec_port;
+ }
+
+ platform_set_drvdata(pdev, qcom_usb);
+ qcom_pmic_typec_typec_hw_init(qcom_usb);
+ qcom_pmic_typec_check_connection(qcom_usb);
+
+ return 0;
+
+err_typec_port:
+ typec_unregister_port(qcom_usb->port);
+err_put_node:
+ fwnode_handle_put(qcom_usb->fwnode);
+
+ return ret;
+}
+
+static int qcom_pmic_typec_remove(struct platform_device *pdev)
+{
+ struct qcom_pmic_typec *qcom_usb = platform_get_drvdata(pdev);
+
+ usb_role_switch_set_role(qcom_usb->role_sw, USB_ROLE_NONE);
+ qcom_pmic_typec_enable_vbus_regulator(qcom_usb, 0);
+
+ typec_unregister_port(qcom_usb->port);
+ usb_role_switch_put(qcom_usb->role_sw);
+ fwnode_handle_put(qcom_usb->fwnode);
+
+ return 0;
+}
+
+static const struct of_device_id qcom_pmic_typec_table[] = {
+ { .compatible = "qcom,pm8150b-usb-typec" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, qcom_pmic_typec_table);
+
+static struct platform_driver qcom_pmic_typec = {
+ .driver = {
+ .name = "qcom,pmic-typec",
+ .of_match_table = qcom_pmic_typec_table,
+ },
+ .probe = qcom_pmic_typec_probe,
+ .remove = qcom_pmic_typec_remove,
+};
+module_platform_driver(qcom_pmic_typec);
+
+MODULE_DESCRIPTION("QCOM PMIC USB type C driver");
+MODULE_LICENSE("GPL v2");
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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