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Date: Wed, 29 May 2024 16:41:40 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
<conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
Hans de Goede <hdegoede@...hat.com>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
Nikita Travkin <nikita@...n.ru>
Subject: Re: [PATCH v4 3/6] usb: typec: ucsi: add Lenovo Yoga C630 glue driver
On 28/05/2024 21:44, Dmitry Baryshkov wrote:
> The Lenovo Yoga C630 WOS laptop provides implements UCSI interface in
> the onboard EC. Add glue driver to interface the platform's UCSI
> implementation.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
> drivers/usb/typec/ucsi/Kconfig | 9 ++
> drivers/usb/typec/ucsi/Makefile | 1 +
> drivers/usb/typec/ucsi/ucsi_yoga_c630.c | 189 ++++++++++++++++++++++++++++++++
> 3 files changed, 199 insertions(+)
>
> diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig
> index bdcb1764cfae..680e1b87b152 100644
> --- a/drivers/usb/typec/ucsi/Kconfig
> +++ b/drivers/usb/typec/ucsi/Kconfig
> @@ -69,4 +69,13 @@ config UCSI_PMIC_GLINK
> To compile the driver as a module, choose M here: the module will be
> called ucsi_glink.
>
> +config UCSI_LENOVO_YOGA_C630
> + tristate "UCSI Interface Driver for Lenovo Yoga C630"
> + depends on EC_LENOVO_YOGA_C630
> + help
> + This driver enables UCSI support on the Lenovo Yoga C630 laptop.
> +
> + To compile the driver as a module, choose M here: the module will be
> + called ucsi_yoga_c630.
> +
> endif
> diff --git a/drivers/usb/typec/ucsi/Makefile b/drivers/usb/typec/ucsi/Makefile
> index b4679f94696b..aed41d23887b 100644
> --- a/drivers/usb/typec/ucsi/Makefile
> +++ b/drivers/usb/typec/ucsi/Makefile
> @@ -21,3 +21,4 @@ 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
> +obj-$(CONFIG_UCSI_LENOVO_YOGA_C630) += ucsi_yoga_c630.o
> diff --git a/drivers/usb/typec/ucsi/ucsi_yoga_c630.c b/drivers/usb/typec/ucsi/ucsi_yoga_c630.c
> new file mode 100644
> index 000000000000..ca1ab5c81b87
> --- /dev/null
> +++ b/drivers/usb/typec/ucsi/ucsi_yoga_c630.c
> @@ -0,0 +1,189 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2022-2024, Linaro Ltd
> + * Authors:
> + * Bjorn Andersson
> + * Dmitry Baryshkov
> + */
> +#include <linux/auxiliary_bus.h>
> +#include <linux/module.h>
> +#include <linux/platform_data/lenovo-yoga-c630.h>
> +
> +#include "ucsi.h"
> +
> +struct yoga_c630_ucsi {
> + struct yoga_c630_ec *ec;
> + struct ucsi *ucsi;
> + struct notifier_block nb;
> + struct completion complete;
> + unsigned long flags;
> +#define UCSI_C630_COMMAND_PENDING 0
> +#define UCSI_C630_ACK_PENDING 1
> + u16 version;
> +};
> +
> +static int yoga_c630_ucsi_read(struct ucsi *ucsi, unsigned int offset,
> + void *val, size_t val_len)
> +{
> + struct yoga_c630_ucsi *uec = ucsi_get_drvdata(ucsi);
> + u8 buf[YOGA_C630_UCSI_READ_SIZE];
> + int ret;
> +
> + ret = yoga_c630_ec_ucsi_read(uec->ec, buf);
> + if (ret)
> + return ret;
> +
> + if (offset == UCSI_VERSION) {
> + memcpy(val, &uec->version, min(val_len, sizeof(uec->version)));
> + return 0;
> + }
> +
> + if (offset == UCSI_CCI)
> + memcpy(val, buf,
> + min(val_len, YOGA_C630_UCSI_CCI_SIZE));
> + else if (offset == UCSI_MESSAGE_IN)
> + memcpy(val, buf + YOGA_C630_UCSI_CCI_SIZE,
> + min(val_len, YOGA_C630_UCSI_DATA_SIZE));
For some reason I believe multi-lines like this, including function
calls that are split over lines should be encapsulated with {}
else if(x) {
memcpy(x,y,
z);
}
If checkpatch doesn't complain about it feel free not to do that though.
> + else
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static int yoga_c630_ucsi_async_write(struct ucsi *ucsi, unsigned int offset,
> + const void *val, size_t val_len)
> +{
> + struct yoga_c630_ucsi *uec = ucsi_get_drvdata(ucsi);
> +
> + if (offset != UCSI_CONTROL ||
> + val_len != YOGA_C630_UCSI_WRITE_SIZE)
> + return -EINVAL;
> +
> + return yoga_c630_ec_ucsi_write(uec->ec, val);
> +}
> +
> +static int yoga_c630_ucsi_sync_write(struct ucsi *ucsi, unsigned int offset,
> + const void *val, size_t val_len)
> +{
> + struct yoga_c630_ucsi *uec = ucsi_get_drvdata(ucsi);
> + bool ack = UCSI_COMMAND(*(u64 *)val) == UCSI_ACK_CC_CI;
> + int ret;
> +
> + if (ack)
> + set_bit(UCSI_C630_ACK_PENDING, &uec->flags);
> + else
> + set_bit(UCSI_C630_COMMAND_PENDING, &uec->flags);
> +
> + reinit_completion(&uec->complete);
> +
> + ret = yoga_c630_ucsi_async_write(ucsi, offset, val, val_len);
> + if (ret)
> + goto out_clear_bit;
> +
> + if (!wait_for_completion_timeout(&uec->complete, 5 * HZ))
> + ret = -ETIMEDOUT;
> +
> +out_clear_bit:
> + if (ack)
> + clear_bit(UCSI_C630_ACK_PENDING, &uec->flags);
> + else
> + clear_bit(UCSI_C630_COMMAND_PENDING, &uec->flags);
> +
> + return ret;
> +}
> +
> +const struct ucsi_operations yoga_c630_ucsi_ops = {
> + .read = yoga_c630_ucsi_read,
> + .sync_write = yoga_c630_ucsi_sync_write,
> + .async_write = yoga_c630_ucsi_async_write,
> +};
> +
> +static int yoga_c630_ucsi_notify(struct notifier_block *nb,
> + unsigned long action, void *data)
> +{
> + struct yoga_c630_ucsi *uec = container_of(nb, struct yoga_c630_ucsi, nb);
> + u32 cci;
> + int ret;
> +
> + if (action == LENOVO_EC_EVENT_USB || action == LENOVO_EC_EVENT_HPD) {
> + ucsi_connector_change(uec->ucsi, 1);
> + return NOTIFY_OK;
> + }
> +
> + if (action != LENOVO_EC_EVENT_UCSI)
> + return NOTIFY_DONE;
Is this disjunction on action a good candidate for a switch(){}
> +
> + ret = uec->ucsi->ops->read(uec->ucsi, UCSI_CCI, &cci, sizeof(cci));
> + if (ret)
> + return NOTIFY_DONE;
> +
> + if (UCSI_CCI_CONNECTOR(cci))
> + ucsi_connector_change(uec->ucsi, UCSI_CCI_CONNECTOR(cci));
> +
> + if (cci & UCSI_CCI_ACK_COMPLETE &&
> + test_bit(UCSI_C630_ACK_PENDING, &uec->flags))
> + complete(&uec->complete);
> + if (cci & UCSI_CCI_COMMAND_COMPLETE &&
> + test_bit(UCSI_C630_COMMAND_PENDING, &uec->flags))
> + complete(&uec->complete);
IMO these multi-line clauses should end up with a {} around the complete
even though its not required.
Emphasis on the O.
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
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