| Message ID | 20230130-topic-sm8450-upstream-pmic-glink-v5-1-552f3b721f9e@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | soc: qcom: add UCSI function to PMIC GLINK | expand |
On Tue, Mar 21, 2023 at 02:21:41PM +0100, Neil Armstrong wrote: > Introduce the UCSI PMIC Glink aux driver that communicates > with the aDSP firmware with the UCSI protocol which handles > the USB-C Port(s) Power Delivery. > > The UCSI messaging is necessary on newer Qualcomm SoCs to > provide USB role switch and altmode notifications. > > Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Reviewed-by: Bjorn Andersson <andersson@kernel.org> Greg, this has no build time dependencies to the remainder of the series, so can you pick this patch 1 and patch 5 (dt-bindings: usb: snps,dwc3: document HS & SS OF graph ports) through your tree? I'll pick up the remainder through the Qualcomm tree. Regards, Bjorn > --- > drivers/usb/typec/ucsi/Kconfig | 10 ++ > drivers/usb/typec/ucsi/Makefile | 1 + > drivers/usb/typec/ucsi/ucsi_glink.c | 345 ++++++++++++++++++++++++++++++++++++ > 3 files changed, 356 insertions(+) > > diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig > index 8f9c4b9f31f7..b3bb0191987e 100644 > --- a/drivers/usb/typec/ucsi/Kconfig > +++ b/drivers/usb/typec/ucsi/Kconfig > @@ -58,4 +58,14 @@ config UCSI_STM32G0 > To compile the driver as a module, choose M here: the module will be > called ucsi_stm32g0. > > +config UCSI_PMIC_GLINK > + tristate "UCSI Qualcomm PMIC GLINK Interface Driver" > + depends on QCOM_PMIC_GLINK > + help > + This driver enables UCSI support on platforms that expose UCSI > + interface as PMIC GLINK device. > + > + To compile the driver as a module, choose M here: the module will be > + called ucsi_glink. > + > endif > diff --git a/drivers/usb/typec/ucsi/Makefile b/drivers/usb/typec/ucsi/Makefile > index 480d533d762f..77f09e136956 100644 > --- a/drivers/usb/typec/ucsi/Makefile > +++ b/drivers/usb/typec/ucsi/Makefile > @@ -18,3 +18,4 @@ endif > obj-$(CONFIG_UCSI_ACPI) += ucsi_acpi.o > obj-$(CONFIG_UCSI_CCG) += ucsi_ccg.o > obj-$(CONFIG_UCSI_STM32G0) += ucsi_stm32g0.o > +obj-$(CONFIG_UCSI_PMIC_GLINK) += ucsi_glink.o > diff --git a/drivers/usb/typec/ucsi/ucsi_glink.c b/drivers/usb/typec/ucsi/ucsi_glink.c > new file mode 100644 > index 000000000000..b454a5159896 > --- /dev/null > +++ b/drivers/usb/typec/ucsi/ucsi_glink.c > @@ -0,0 +1,345 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved. > + * Copyright (c) 2023, Linaro Ltd > + */ > +#include <linux/auxiliary_bus.h> > +#include <linux/module.h> > +#include <linux/of_device.h> > +#include <linux/mutex.h> > +#include <linux/property.h> > +#include <linux/soc/qcom/pdr.h> > +#include <linux/soc/qcom/pmic_glink.h> > +#include "ucsi.h" > + > +#define UCSI_BUF_SIZE 48 > + > +#define MSG_TYPE_REQ_RESP 1 > +#define UCSI_BUF_SIZE 48 > + > +#define UC_NOTIFY_RECEIVER_UCSI 0x0 > +#define UC_UCSI_READ_BUF_REQ 0x11 > +#define UC_UCSI_WRITE_BUF_REQ 0x12 > +#define UC_UCSI_USBC_NOTIFY_IND 0x13 > + > +struct ucsi_read_buf_req_msg { > + struct pmic_glink_hdr hdr; > +}; > + > +struct ucsi_read_buf_resp_msg { > + struct pmic_glink_hdr hdr; > + u8 buf[UCSI_BUF_SIZE]; > + u32 ret_code; > +}; > + > +struct ucsi_write_buf_req_msg { > + struct pmic_glink_hdr hdr; > + u8 buf[UCSI_BUF_SIZE]; > + u32 reserved; > +}; > + > +struct ucsi_write_buf_resp_msg { > + struct pmic_glink_hdr hdr; > + u32 ret_code; > +}; > + > +struct ucsi_notify_ind_msg { > + struct pmic_glink_hdr hdr; > + u32 notification; > + u32 receiver; > + u32 reserved; > +}; > + > +struct pmic_glink_ucsi { > + struct device *dev; > + > + struct pmic_glink_client *client; > + > + struct ucsi *ucsi; > + struct completion read_ack; > + struct completion write_ack; > + struct completion sync_ack; > + bool sync_pending; > + struct mutex lock; /* protects concurrent access to PMIC Glink interface */ > + > + int sync_val; > + > + struct work_struct notify_work; > + struct work_struct register_work; > + > + u8 read_buf[UCSI_BUF_SIZE]; > +}; > + > +static int pmic_glink_ucsi_read(struct ucsi *__ucsi, unsigned int offset, > + void *val, size_t val_len) > +{ > + struct pmic_glink_ucsi *ucsi = ucsi_get_drvdata(__ucsi); > + struct ucsi_read_buf_req_msg req = {}; > + unsigned long left; > + int ret; > + > + req.hdr.owner = PMIC_GLINK_OWNER_USBC; > + req.hdr.type = MSG_TYPE_REQ_RESP; > + req.hdr.opcode = UC_UCSI_READ_BUF_REQ; > + > + mutex_lock(&ucsi->lock); > + memset(ucsi->read_buf, 0, sizeof(ucsi->read_buf)); > + reinit_completion(&ucsi->read_ack); > + > + ret = pmic_glink_send(ucsi->client, &req, sizeof(req)); > + if (ret < 0) { > + dev_err(ucsi->dev, "failed to send UCSI read request: %d\n", ret); > + goto out_unlock; > + } > + > + left = wait_for_completion_timeout(&ucsi->read_ack, 5 * HZ); > + if (!left) { > + dev_err(ucsi->dev, "timeout waiting for UCSI read response\n"); > + ret = -ETIMEDOUT; > + goto out_unlock; > + } > + > + memcpy(val, &ucsi->read_buf[offset], val_len); > + ret = 0; > + > +out_unlock: > + mutex_unlock(&ucsi->lock); > + > + return ret; > +} > + > +static int pmic_glink_ucsi_locked_write(struct pmic_glink_ucsi *ucsi, unsigned int offset, > + const void *val, size_t val_len) > +{ > + struct ucsi_write_buf_req_msg req = {}; > + unsigned long left; > + int ret; > + > + req.hdr.owner = PMIC_GLINK_OWNER_USBC; > + req.hdr.type = MSG_TYPE_REQ_RESP; > + req.hdr.opcode = UC_UCSI_WRITE_BUF_REQ; > + memcpy(&req.buf[offset], val, val_len); > + > + reinit_completion(&ucsi->write_ack); > + > + ret = pmic_glink_send(ucsi->client, &req, sizeof(req)); > + if (ret < 0) { > + dev_err(ucsi->dev, "failed to send UCSI write request: %d\n", ret); > + return ret; > + } > + > + left = wait_for_completion_timeout(&ucsi->write_ack, 5 * HZ); > + if (!left) { > + dev_err(ucsi->dev, "timeout waiting for UCSI write response\n"); > + return -ETIMEDOUT; > + } > + > + return 0; > +} > + > +static int pmic_glink_ucsi_async_write(struct ucsi *__ucsi, unsigned int offset, > + const void *val, size_t val_len) > +{ > + struct pmic_glink_ucsi *ucsi = ucsi_get_drvdata(__ucsi); > + int ret; > + > + mutex_lock(&ucsi->lock); > + ret = pmic_glink_ucsi_locked_write(ucsi, offset, val, val_len); > + mutex_unlock(&ucsi->lock); > + > + return ret; > +} > + > +static int pmic_glink_ucsi_sync_write(struct ucsi *__ucsi, unsigned int offset, > + const void *val, size_t val_len) > +{ > + struct pmic_glink_ucsi *ucsi = ucsi_get_drvdata(__ucsi); > + unsigned long left; > + int ret; > + > + /* TOFIX: Downstream forces recipient to CON when UCSI_GET_ALTERNATE_MODES command */ > + > + mutex_lock(&ucsi->lock); > + ucsi->sync_val = 0; > + reinit_completion(&ucsi->sync_ack); > + ucsi->sync_pending = true; > + ret = pmic_glink_ucsi_locked_write(ucsi, offset, val, val_len); > + mutex_unlock(&ucsi->lock); > + > + left = wait_for_completion_timeout(&ucsi->sync_ack, 5 * HZ); > + if (!left) { > + dev_err(ucsi->dev, "timeout waiting for UCSI sync write response\n"); > + ret = -ETIMEDOUT; > + } else if (ucsi->sync_val) { > + dev_err(ucsi->dev, "sync write returned: %d\n", ucsi->sync_val); > + } > + > + ucsi->sync_pending = false; > + > + return ret; > +} > + > +static const struct ucsi_operations pmic_glink_ucsi_ops = { > + .read = pmic_glink_ucsi_read, > + .sync_write = pmic_glink_ucsi_sync_write, > + .async_write = pmic_glink_ucsi_async_write > +}; > + > +static void pmic_glink_ucsi_read_ack(struct pmic_glink_ucsi *ucsi, const void *data, int len) > +{ > + const struct ucsi_read_buf_resp_msg *resp = data; > + > + if (resp->ret_code) > + return; > + > + memcpy(ucsi->read_buf, resp->buf, UCSI_BUF_SIZE); > + complete(&ucsi->read_ack); > +} > + > +static void pmic_glink_ucsi_write_ack(struct pmic_glink_ucsi *ucsi, const void *data, int len) > +{ > + const struct ucsi_write_buf_resp_msg *resp = data; > + > + if (resp->ret_code) > + return; > + > + ucsi->sync_val = resp->ret_code; > + complete(&ucsi->write_ack); > +} > + > +static void pmic_glink_ucsi_notify(struct work_struct *work) > +{ > + struct pmic_glink_ucsi *ucsi = container_of(work, struct pmic_glink_ucsi, notify_work); > + unsigned int con_num; > + u32 cci; > + int ret; > + > + ret = pmic_glink_ucsi_read(ucsi->ucsi, UCSI_CCI, &cci, sizeof(cci)); > + if (ret) { > + dev_err(ucsi->dev, "failed to read CCI on notification\n"); > + return; > + } > + > + con_num = UCSI_CCI_CONNECTOR(cci); > + if (con_num) > + ucsi_connector_change(ucsi->ucsi, con_num); > + > + if (ucsi->sync_pending && cci & UCSI_CCI_BUSY) { > + ucsi->sync_val = -EBUSY; > + complete(&ucsi->sync_ack); > + } else if (ucsi->sync_pending && > + (cci & (UCSI_CCI_ACK_COMPLETE | UCSI_CCI_COMMAND_COMPLETE))) { > + complete(&ucsi->sync_ack); > + } > +} > + > +static void pmic_glink_ucsi_register(struct work_struct *work) > +{ > + struct pmic_glink_ucsi *ucsi = container_of(work, struct pmic_glink_ucsi, register_work); > + > + ucsi_register(ucsi->ucsi); > +} > + > +static void pmic_glink_ucsi_callback(const void *data, size_t len, void *priv) > +{ > + struct pmic_glink_ucsi *ucsi = priv; > + const struct pmic_glink_hdr *hdr = data; > + > + switch (hdr->opcode) { > + case UC_UCSI_READ_BUF_REQ: > + pmic_glink_ucsi_read_ack(ucsi, data, len); > + break; > + case UC_UCSI_WRITE_BUF_REQ: > + pmic_glink_ucsi_write_ack(ucsi, data, len); > + break; > + case UC_UCSI_USBC_NOTIFY_IND: > + schedule_work(&ucsi->notify_work); > + break; > + }; > +} > + > +static void pmic_glink_ucsi_pdr_notify(void *priv, int state) > +{ > + struct pmic_glink_ucsi *ucsi = priv; > + > + if (state == SERVREG_SERVICE_STATE_UP) > + schedule_work(&ucsi->register_work); > + else if (state == SERVREG_SERVICE_STATE_DOWN) > + ucsi_unregister(ucsi->ucsi); > +} > + > +static void pmic_glink_ucsi_destroy(void *data) > +{ > + struct pmic_glink_ucsi *ucsi = data; > + > + /* Protect to make sure we're not in a middle of a transaction from a glink callback */ > + mutex_lock(&ucsi->lock); > + ucsi_destroy(ucsi->ucsi); > + mutex_unlock(&ucsi->lock); > +} > + > +static int pmic_glink_ucsi_probe(struct auxiliary_device *adev, > + const struct auxiliary_device_id *id) > +{ > + struct pmic_glink_ucsi *ucsi; > + struct device *dev = &adev->dev; > + int ret; > + > + ucsi = devm_kzalloc(dev, sizeof(*ucsi), GFP_KERNEL); > + if (!ucsi) > + return -ENOMEM; > + > + ucsi->dev = dev; > + dev_set_drvdata(dev, ucsi); > + > + INIT_WORK(&ucsi->notify_work, pmic_glink_ucsi_notify); > + INIT_WORK(&ucsi->register_work, pmic_glink_ucsi_register); > + init_completion(&ucsi->read_ack); > + init_completion(&ucsi->write_ack); > + init_completion(&ucsi->sync_ack); > + mutex_init(&ucsi->lock); > + > + ucsi->ucsi = ucsi_create(dev, &pmic_glink_ucsi_ops); > + if (IS_ERR(ucsi->ucsi)) > + return PTR_ERR(ucsi->ucsi); > + > + /* Make sure we destroy *after* pmic_glink unregister */ > + ret = devm_add_action_or_reset(dev, pmic_glink_ucsi_destroy, ucsi); > + if (ret) > + return ret; > + > + ucsi_set_drvdata(ucsi->ucsi, ucsi); > + > + ucsi->client = devm_pmic_glink_register_client(dev, > + PMIC_GLINK_OWNER_USBC, > + pmic_glink_ucsi_callback, > + pmic_glink_ucsi_pdr_notify, > + ucsi); > + return PTR_ERR_OR_ZERO(ucsi->client); > +} > + > +static void pmic_glink_ucsi_remove(struct auxiliary_device *adev) > +{ > + struct pmic_glink_ucsi *ucsi = dev_get_drvdata(&adev->dev); > + > + /* Unregister first to stop having read & writes */ > + ucsi_unregister(ucsi->ucsi); > +} > + > +static const struct auxiliary_device_id pmic_glink_ucsi_id_table[] = { > + { .name = "pmic_glink.ucsi", }, > + {}, > +}; > +MODULE_DEVICE_TABLE(auxiliary, pmic_glink_ucsi_id_table); > + > +static struct auxiliary_driver pmic_glink_ucsi_driver = { > + .name = "pmic_glink_ucsi", > + .probe = pmic_glink_ucsi_probe, > + .remove = pmic_glink_ucsi_remove, > + .id_table = pmic_glink_ucsi_id_table, > +}; > + > +module_auxiliary_driver(pmic_glink_ucsi_driver); > + > +MODULE_DESCRIPTION("Qualcomm PMIC GLINK UCSI driver"); > +MODULE_LICENSE("GPL"); > > -- > 2.34.1 >
On Tue, Mar 21, 2023 at 07:31:02PM -0700, Bjorn Andersson wrote: > On Tue, Mar 21, 2023 at 02:21:41PM +0100, Neil Armstrong wrote: > > Introduce the UCSI PMIC Glink aux driver that communicates > > with the aDSP firmware with the UCSI protocol which handles > > the USB-C Port(s) Power Delivery. > > > > The UCSI messaging is necessary on newer Qualcomm SoCs to > > provide USB role switch and altmode notifications. > > > > Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > > Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> > > Reviewed-by: Bjorn Andersson <andersson@kernel.org> > > > Greg, this has no build time dependencies to the remainder of the > series, so can you pick this patch 1 and patch 5 (dt-bindings: usb: > snps,dwc3: document HS & SS OF graph ports) through your tree? Yes, will do so, thanks! greg k-h
diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig index 8f9c4b9f31f7..b3bb0191987e 100644 --- a/drivers/usb/typec/ucsi/Kconfig +++ b/drivers/usb/typec/ucsi/Kconfig @@ -58,4 +58,14 @@ config UCSI_STM32G0 To compile the driver as a module, choose M here: the module will be called ucsi_stm32g0. +config UCSI_PMIC_GLINK + tristate "UCSI Qualcomm PMIC GLINK Interface Driver" + depends on QCOM_PMIC_GLINK + help + This driver enables UCSI support on platforms that expose UCSI + interface as PMIC GLINK device. + + To compile the driver as a module, choose M here: the module will be + called ucsi_glink. + endif diff --git a/drivers/usb/typec/ucsi/Makefile b/drivers/usb/typec/ucsi/Makefile index 480d533d762f..77f09e136956 100644 --- a/drivers/usb/typec/ucsi/Makefile +++ b/drivers/usb/typec/ucsi/Makefile @@ -18,3 +18,4 @@ endif obj-$(CONFIG_UCSI_ACPI) += ucsi_acpi.o obj-$(CONFIG_UCSI_CCG) += ucsi_ccg.o obj-$(CONFIG_UCSI_STM32G0) += ucsi_stm32g0.o +obj-$(CONFIG_UCSI_PMIC_GLINK) += ucsi_glink.o diff --git a/drivers/usb/typec/ucsi/ucsi_glink.c b/drivers/usb/typec/ucsi/ucsi_glink.c new file mode 100644 index 000000000000..b454a5159896 --- /dev/null +++ b/drivers/usb/typec/ucsi/ucsi_glink.c @@ -0,0 +1,345 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved. + * Copyright (c) 2023, Linaro Ltd + */ +#include <linux/auxiliary_bus.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/mutex.h> +#include <linux/property.h> +#include <linux/soc/qcom/pdr.h> +#include <linux/soc/qcom/pmic_glink.h> +#include "ucsi.h" + +#define UCSI_BUF_SIZE 48 + +#define MSG_TYPE_REQ_RESP 1 +#define UCSI_BUF_SIZE 48 + +#define UC_NOTIFY_RECEIVER_UCSI 0x0 +#define UC_UCSI_READ_BUF_REQ 0x11 +#define UC_UCSI_WRITE_BUF_REQ 0x12 +#define UC_UCSI_USBC_NOTIFY_IND 0x13 + +struct ucsi_read_buf_req_msg { + struct pmic_glink_hdr hdr; +}; + +struct ucsi_read_buf_resp_msg { + struct pmic_glink_hdr hdr; + u8 buf[UCSI_BUF_SIZE]; + u32 ret_code; +}; + +struct ucsi_write_buf_req_msg { + struct pmic_glink_hdr hdr; + u8 buf[UCSI_BUF_SIZE]; + u32 reserved; +}; + +struct ucsi_write_buf_resp_msg { + struct pmic_glink_hdr hdr; + u32 ret_code; +}; + +struct ucsi_notify_ind_msg { + struct pmic_glink_hdr hdr; + u32 notification; + u32 receiver; + u32 reserved; +}; + +struct pmic_glink_ucsi { + struct device *dev; + + struct pmic_glink_client *client; + + struct ucsi *ucsi; + struct completion read_ack; + struct completion write_ack; + struct completion sync_ack; + bool sync_pending; + struct mutex lock; /* protects concurrent access to PMIC Glink interface */ + + int sync_val; + + struct work_struct notify_work; + struct work_struct register_work; + + u8 read_buf[UCSI_BUF_SIZE]; +}; + +static int pmic_glink_ucsi_read(struct ucsi *__ucsi, unsigned int offset, + void *val, size_t val_len) +{ + struct pmic_glink_ucsi *ucsi = ucsi_get_drvdata(__ucsi); + struct ucsi_read_buf_req_msg req = {}; + unsigned long left; + int ret; + + req.hdr.owner = PMIC_GLINK_OWNER_USBC; + req.hdr.type = MSG_TYPE_REQ_RESP; + req.hdr.opcode = UC_UCSI_READ_BUF_REQ; + + mutex_lock(&ucsi->lock); + memset(ucsi->read_buf, 0, sizeof(ucsi->read_buf)); + reinit_completion(&ucsi->read_ack); + + ret = pmic_glink_send(ucsi->client, &req, sizeof(req)); + if (ret < 0) { + dev_err(ucsi->dev, "failed to send UCSI read request: %d\n", ret); + goto out_unlock; + } + + left = wait_for_completion_timeout(&ucsi->read_ack, 5 * HZ); + if (!left) { + dev_err(ucsi->dev, "timeout waiting for UCSI read response\n"); + ret = -ETIMEDOUT; + goto out_unlock; + } + + memcpy(val, &ucsi->read_buf[offset], val_len); + ret = 0; + +out_unlock: + mutex_unlock(&ucsi->lock); + + return ret; +} + +static int pmic_glink_ucsi_locked_write(struct pmic_glink_ucsi *ucsi, unsigned int offset, + const void *val, size_t val_len) +{ + struct ucsi_write_buf_req_msg req = {}; + unsigned long left; + int ret; + + req.hdr.owner = PMIC_GLINK_OWNER_USBC; + req.hdr.type = MSG_TYPE_REQ_RESP; + req.hdr.opcode = UC_UCSI_WRITE_BUF_REQ; + memcpy(&req.buf[offset], val, val_len); + + reinit_completion(&ucsi->write_ack); + + ret = pmic_glink_send(ucsi->client, &req, sizeof(req)); + if (ret < 0) { + dev_err(ucsi->dev, "failed to send UCSI write request: %d\n", ret); + return ret; + } + + left = wait_for_completion_timeout(&ucsi->write_ack, 5 * HZ); + if (!left) { + dev_err(ucsi->dev, "timeout waiting for UCSI write response\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static int pmic_glink_ucsi_async_write(struct ucsi *__ucsi, unsigned int offset, + const void *val, size_t val_len) +{ + struct pmic_glink_ucsi *ucsi = ucsi_get_drvdata(__ucsi); + int ret; + + mutex_lock(&ucsi->lock); + ret = pmic_glink_ucsi_locked_write(ucsi, offset, val, val_len); + mutex_unlock(&ucsi->lock); + + return ret; +} + +static int pmic_glink_ucsi_sync_write(struct ucsi *__ucsi, unsigned int offset, + const void *val, size_t val_len) +{ + struct pmic_glink_ucsi *ucsi = ucsi_get_drvdata(__ucsi); + unsigned long left; + int ret; + + /* TOFIX: Downstream forces recipient to CON when UCSI_GET_ALTERNATE_MODES command */ + + mutex_lock(&ucsi->lock); + ucsi->sync_val = 0; + reinit_completion(&ucsi->sync_ack); + ucsi->sync_pending = true; + ret = pmic_glink_ucsi_locked_write(ucsi, offset, val, val_len); + mutex_unlock(&ucsi->lock); + + left = wait_for_completion_timeout(&ucsi->sync_ack, 5 * HZ); + if (!left) { + dev_err(ucsi->dev, "timeout waiting for UCSI sync write response\n"); + ret = -ETIMEDOUT; + } else if (ucsi->sync_val) { + dev_err(ucsi->dev, "sync write returned: %d\n", ucsi->sync_val); + } + + ucsi->sync_pending = false; + + return ret; +} + +static const struct ucsi_operations pmic_glink_ucsi_ops = { + .read = pmic_glink_ucsi_read, + .sync_write = pmic_glink_ucsi_sync_write, + .async_write = pmic_glink_ucsi_async_write +}; + +static void pmic_glink_ucsi_read_ack(struct pmic_glink_ucsi *ucsi, const void *data, int len) +{ + const struct ucsi_read_buf_resp_msg *resp = data; + + if (resp->ret_code) + return; + + memcpy(ucsi->read_buf, resp->buf, UCSI_BUF_SIZE); + complete(&ucsi->read_ack); +} + +static void pmic_glink_ucsi_write_ack(struct pmic_glink_ucsi *ucsi, const void *data, int len) +{ + const struct ucsi_write_buf_resp_msg *resp = data; + + if (resp->ret_code) + return; + + ucsi->sync_val = resp->ret_code; + complete(&ucsi->write_ack); +} + +static void pmic_glink_ucsi_notify(struct work_struct *work) +{ + struct pmic_glink_ucsi *ucsi = container_of(work, struct pmic_glink_ucsi, notify_work); + unsigned int con_num; + u32 cci; + int ret; + + ret = pmic_glink_ucsi_read(ucsi->ucsi, UCSI_CCI, &cci, sizeof(cci)); + if (ret) { + dev_err(ucsi->dev, "failed to read CCI on notification\n"); + return; + } + + con_num = UCSI_CCI_CONNECTOR(cci); + if (con_num) + ucsi_connector_change(ucsi->ucsi, con_num); + + if (ucsi->sync_pending && cci & UCSI_CCI_BUSY) { + ucsi->sync_val = -EBUSY; + complete(&ucsi->sync_ack); + } else if (ucsi->sync_pending && + (cci & (UCSI_CCI_ACK_COMPLETE | UCSI_CCI_COMMAND_COMPLETE))) { + complete(&ucsi->sync_ack); + } +} + +static void pmic_glink_ucsi_register(struct work_struct *work) +{ + struct pmic_glink_ucsi *ucsi = container_of(work, struct pmic_glink_ucsi, register_work); + + ucsi_register(ucsi->ucsi); +} + +static void pmic_glink_ucsi_callback(const void *data, size_t len, void *priv) +{ + struct pmic_glink_ucsi *ucsi = priv; + const struct pmic_glink_hdr *hdr = data; + + switch (hdr->opcode) { + case UC_UCSI_READ_BUF_REQ: + pmic_glink_ucsi_read_ack(ucsi, data, len); + break; + case UC_UCSI_WRITE_BUF_REQ: + pmic_glink_ucsi_write_ack(ucsi, data, len); + break; + case UC_UCSI_USBC_NOTIFY_IND: + schedule_work(&ucsi->notify_work); + break; + }; +} + +static void pmic_glink_ucsi_pdr_notify(void *priv, int state) +{ + struct pmic_glink_ucsi *ucsi = priv; + + if (state == SERVREG_SERVICE_STATE_UP) + schedule_work(&ucsi->register_work); + else if (state == SERVREG_SERVICE_STATE_DOWN) + ucsi_unregister(ucsi->ucsi); +} + +static void pmic_glink_ucsi_destroy(void *data) +{ + struct pmic_glink_ucsi *ucsi = data; + + /* Protect to make sure we're not in a middle of a transaction from a glink callback */ + mutex_lock(&ucsi->lock); + ucsi_destroy(ucsi->ucsi); + mutex_unlock(&ucsi->lock); +} + +static int pmic_glink_ucsi_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + struct pmic_glink_ucsi *ucsi; + struct device *dev = &adev->dev; + int ret; + + ucsi = devm_kzalloc(dev, sizeof(*ucsi), GFP_KERNEL); + if (!ucsi) + return -ENOMEM; + + ucsi->dev = dev; + dev_set_drvdata(dev, ucsi); + + INIT_WORK(&ucsi->notify_work, pmic_glink_ucsi_notify); + INIT_WORK(&ucsi->register_work, pmic_glink_ucsi_register); + init_completion(&ucsi->read_ack); + init_completion(&ucsi->write_ack); + init_completion(&ucsi->sync_ack); + mutex_init(&ucsi->lock); + + ucsi->ucsi = ucsi_create(dev, &pmic_glink_ucsi_ops); + if (IS_ERR(ucsi->ucsi)) + return PTR_ERR(ucsi->ucsi); + + /* Make sure we destroy *after* pmic_glink unregister */ + ret = devm_add_action_or_reset(dev, pmic_glink_ucsi_destroy, ucsi); + if (ret) + return ret; + + ucsi_set_drvdata(ucsi->ucsi, ucsi); + + ucsi->client = devm_pmic_glink_register_client(dev, + PMIC_GLINK_OWNER_USBC, + pmic_glink_ucsi_callback, + pmic_glink_ucsi_pdr_notify, + ucsi); + return PTR_ERR_OR_ZERO(ucsi->client); +} + +static void pmic_glink_ucsi_remove(struct auxiliary_device *adev) +{ + struct pmic_glink_ucsi *ucsi = dev_get_drvdata(&adev->dev); + + /* Unregister first to stop having read & writes */ + ucsi_unregister(ucsi->ucsi); +} + +static const struct auxiliary_device_id pmic_glink_ucsi_id_table[] = { + { .name = "pmic_glink.ucsi", }, + {}, +}; +MODULE_DEVICE_TABLE(auxiliary, pmic_glink_ucsi_id_table); + +static struct auxiliary_driver pmic_glink_ucsi_driver = { + .name = "pmic_glink_ucsi", + .probe = pmic_glink_ucsi_probe, + .remove = pmic_glink_ucsi_remove, + .id_table = pmic_glink_ucsi_id_table, +}; + +module_auxiliary_driver(pmic_glink_ucsi_driver); + +MODULE_DESCRIPTION("Qualcomm PMIC GLINK UCSI driver"); +MODULE_LICENSE("GPL");