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Message-ID: <159601160976.1360974.10172804658083744292@swboyd.mtv.corp.google.com>
Date: Wed, 29 Jul 2020 01:33:29 -0700
From: Stephen Boyd <sboyd@...nel.org>
To: Wesley Cheng <wcheng@...eaurora.org>, agross@...nel.org,
bjorn.andersson@...aro.org, gregkh@...uxfoundation.org,
heikki.krogerus@...ux.intel.com, robh+dt@...nel.org
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
jackp@...eaurora.org, Wesley Cheng <wcheng@...eaurora.org>
Subject: Re: [PATCH v6 1/4] usb: typec: Add QCOM PMIC typec detection driver
Quoting Wesley Cheng (2020-07-29 00:13:37)
> diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig
> index 559dd06117e7..3e375f82849d 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
Can you add || COMPILE_TEST here?
> + 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/qcom-pmic-typec.c b/drivers/usb/typec/qcom-pmic-typec.c
> new file mode 100644
> index 000000000000..5ae3af03c638
> --- /dev/null
> +++ b/drivers/usb/typec/qcom-pmic-typec.c
> @@ -0,0 +1,275 @@
> +// 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/of_irq.h>
Is this include used?
> +#include <linux/platform_device.h>
> +#include <linux/of_device.h>
Is this include used?
> +#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 = 0;
Please don't assign and then reassign before testing this variable.
> +
> + 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) >> 1) ?
Do we really need to shift >> by 1? Seems useless for a test.
> + 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 = of_property_read_u32(dev->of_node, "reg", ®);
> + if (ret < 0) {
> + dev_err(dev, "missing base address");
Please add newlines at the end of printk messages.
> + 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) {
> + dev_err(dev, "Failed to get CC irq\n");
platform_get_irq() already prints an error message. Please remove this.
> + 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" },
> + { },
Nitpick: Drop the comma here so nothing can come after without causing a
compile error.
> +};
> +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,
> +};
> +
Another nitpick: Drop the newline and make module_platform_driver()
follow directly after the driver.
> +module_platform_driver(qcom_pmic_typec);
> +
> +MODULE_DESCRIPTION("QCOM PMIC USB type C driver");
> +MODULE_LICENSE("GPL v2");
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