Messages in this thread |  | | Date | Mon, 6 Dec 2021 10:24:32 +0530 | Subject | Re: [PATCH V2 5/8] soc: qcom: eud: Add driver support for Embedded USB Debugger(EUD) | From | Souradeep Chowdhury <> |
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On 12/3/2021 4:34 PM, Greg KH wrote: > On Thu, Dec 02, 2021 at 03:21:24PM +0530, Souradeep Chowdhury wrote: >> Add support for control peripheral of EUD (Embedded USB Debugger) to >> listen to events such as USB attach/detach, pet EUD to indicate software >> is functional.Reusing the platform device kobj, sysfs entry 'enable' is >> created to enable or disable EUD. >> >> To enable the eud the following needs to be done >> echo 1 > /sys/bus/platform/.../enable >> >> To disable eud, following is the command >> echo 0 > /sys/bus/platform/.../enable >> >> Signed-off-by: Souradeep Chowdhury <quic_schowdhu@quicinc.com> >> --- >> Documentation/ABI/testing/sysfs-driver-eud | 9 + >> drivers/soc/qcom/Kconfig | 10 ++ >> drivers/soc/qcom/Makefile | 1 + >> drivers/soc/qcom/qcom_eud.c | 268 +++++++++++++++++++++++++++++ >> 4 files changed, 288 insertions(+) >> create mode 100644 Documentation/ABI/testing/sysfs-driver-eud >> create mode 100644 drivers/soc/qcom/qcom_eud.c >> >> diff --git a/Documentation/ABI/testing/sysfs-driver-eud b/Documentation/ABI/testing/sysfs-driver-eud >> new file mode 100644 >> index 0000000..eaf2e82 >> --- /dev/null >> +++ b/Documentation/ABI/testing/sysfs-driver-eud >> @@ -0,0 +1,9 @@ >> +What: /sys/bus/platform/drivers/eud/.../enable >> +Date: October 2021 > You sent this patch in December 2021 :( > Ack > >> +Contact: Souradeep Chowdhury <quic_schowdhu@quicinc.com> >> +Description: >> + The Enable/Disable sysfs interface for Embedded >> + USB Debugger(EUD). This enables and disables the >> + EUD based on a 1 or a 0 value. By enabling EUD, >> + the user is able to activate the mini-usb hub of >> + EUD for debug and trace capabilities. >> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig >> index 79b568f..a4db41b 100644 >> --- a/drivers/soc/qcom/Kconfig >> +++ b/drivers/soc/qcom/Kconfig >> @@ -42,6 +42,16 @@ config QCOM_CPR >> To compile this driver as a module, choose M here: the module will >> be called qcom-cpr >> >> +config QCOM_EUD >> + tristate "QCOM Embedded USB Debugger(EUD) Driver" >> + select USB_ROLE_SWITCH >> + help >> + This module enables support for Qualcomm Technologies, Inc. >> + Embedded USB Debugger (EUD). The EUD is a control peripheral >> + which reports VBUS attach/detach events and has USB-based >> + debug and trace capabilities. On selecting m, the module name >> + that is built is qcom_eud.ko >> + >> config QCOM_GENI_SE >> tristate "QCOM GENI Serial Engine Driver" >> depends on ARCH_QCOM || COMPILE_TEST >> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile >> index ad675a6..3331a40 100644 >> --- a/drivers/soc/qcom/Makefile >> +++ b/drivers/soc/qcom/Makefile >> @@ -4,6 +4,7 @@ obj-$(CONFIG_QCOM_AOSS_QMP) += qcom_aoss.o >> obj-$(CONFIG_QCOM_GENI_SE) += qcom-geni-se.o >> obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o >> obj-$(CONFIG_QCOM_CPR) += cpr.o >> +obj-$(CONFIG_QCOM_EUD) += qcom_eud.o >> obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o >> obj-$(CONFIG_QCOM_MDT_LOADER) += mdt_loader.o >> obj-$(CONFIG_QCOM_OCMEM) += ocmem.o >> diff --git a/drivers/soc/qcom/qcom_eud.c b/drivers/soc/qcom/qcom_eud.c >> new file mode 100644 >> index 0000000..613ac41 >> --- /dev/null >> +++ b/drivers/soc/qcom/qcom_eud.c >> @@ -0,0 +1,268 @@ >> +// SPDX-License-Identifier: GPL-2.0-only >> +/* >> + * Copyright (c) 2015-2021, The Linux Foundation. All rights reserved. >> + */ >> + >> +#include <linux/bitops.h> >> +#include <linux/delay.h> >> +#include <linux/err.h> >> +#include <linux/interrupt.h> >> +#include <linux/io.h> >> +#include <linux/iopoll.h> >> +#include <linux/kernel.h> >> +#include <linux/module.h> >> +#include <linux/of.h> >> +#include <linux/platform_device.h> >> +#include <linux/slab.h> >> +#include <linux/sysfs.h> >> +#include <linux/usb/role.h> >> + >> +#define EUD_REG_INT1_EN_MASK 0x0024 >> +#define EUD_REG_INT_STATUS_1 0x0044 >> +#define EUD_REG_CTL_OUT_1 0x0074 >> +#define EUD_REG_VBUS_INT_CLR 0x0080 >> +#define EUD_REG_CSR_EUD_EN 0x1014 >> +#define EUD_REG_SW_ATTACH_DET 0x1018 >> +#define EUD_REG_EUD_EN2 0x0000 >> + >> +#define EUD_ENABLE BIT(0) >> +#define EUD_INT_PET_EUD BIT(0) >> +#define EUD_INT_VBUS BIT(2) >> +#define EUD_INT_SAFE_MODE BIT(4) >> +#define EUD_INT_ALL (EUD_INT_VBUS|EUD_INT_SAFE_MODE) >> + >> +struct eud_chip { >> + struct device *dev; >> + struct usb_role_switch *role_sw; >> + void __iomem *eud_reg_base; >> + void __iomem *eud_mode_mgr2_phys_base; >> + unsigned int int_status; >> + int eud_irq; >> + bool enable; >> + bool usb_attach; >> + >> +}; >> + >> +static int enable_eud(struct eud_chip *priv) >> +{ >> + writel(EUD_ENABLE, priv->eud_reg_base + EUD_REG_CSR_EUD_EN); >> + writel(EUD_INT_VBUS | EUD_INT_SAFE_MODE, >> + priv->eud_reg_base + EUD_REG_INT1_EN_MASK); >> + writel(1, priv->eud_mode_mgr2_phys_base + EUD_REG_EUD_EN2); >> + >> + return usb_role_switch_set_role(priv->role_sw, USB_ROLE_DEVICE); >> +} >> + >> +static void disable_eud(struct eud_chip *priv) >> +{ >> + writel(0, priv->eud_reg_base + EUD_REG_CSR_EUD_EN); >> + writel(0, priv->eud_mode_mgr2_phys_base + EUD_REG_EUD_EN2); >> +} >> + >> +static ssize_t enable_show(struct device *dev, >> + struct device_attribute *attr, char *buf) >> +{ >> + struct eud_chip *chip = dev_get_drvdata(dev); >> + >> + return sysfs_emit(buf, "%d\n", chip->enable); >> +} >> + >> +static ssize_t enable_store(struct device *dev, >> + struct device_attribute *attr, >> + const char *buf, size_t count) >> +{ >> + struct eud_chip *chip = dev_get_drvdata(dev); >> + bool enable; >> + int ret; >> + >> + if (kstrtobool(buf, &enable)) >> + return -EINVAL; >> + >> + if (enable) { >> + ret = enable_eud(chip); >> + if (!ret) >> + chip->enable = enable; >> + } else { >> + disable_eud(chip); >> + } >> + >> + return count; >> +} >> + >> +static DEVICE_ATTR_RW(enable); >> + >> +static struct attribute *eud_attrs[] = { >> + &dev_attr_enable.attr, >> + NULL, >> +}; >> + >> +static struct attribute_group attr_group = { >> + .attrs = eud_attrs, >> +}; >> + >> +static const struct attribute_group *attr_groups[] = { >> + &attr_group, >> + NULL >> +}; > ATTRIBUTE_GROUPS()? Ack > > thanks, > > greg k-h
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