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Date: Wed, 29 May 2024 00:51:04 +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 2/6] platform: arm64: add Lenovo Yoga C630 WOS EC
driver
On 28/05/2024 21:44, Dmitry Baryshkov wrote:
> Lenovo Yoga C630 WOS is a laptop using Snapdragon 850 SoC. Like many
> laptops it uses embedded controller (EC) to perform various platform
an embedded controller
> operations, including, but not limited, to Type-C port control or power
> supply handlng.
>
> Add the driver for the EC, that creates devices for UCSI and power
> supply devices.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
> drivers/platform/arm64/Kconfig | 14 ++
> drivers/platform/arm64/Makefile | 1 +
> drivers/platform/arm64/lenovo-yoga-c630.c | 279 +++++++++++++++++++++++++
> include/linux/platform_data/lenovo-yoga-c630.h | 42 ++++
> 4 files changed, 336 insertions(+)
>
> diff --git a/drivers/platform/arm64/Kconfig b/drivers/platform/arm64/Kconfig
> index 8fdca0f8e909..8c103b3150d1 100644
> --- a/drivers/platform/arm64/Kconfig
> +++ b/drivers/platform/arm64/Kconfig
> @@ -32,4 +32,18 @@ config EC_ACER_ASPIRE1
> laptop where this information is not properly exposed via the
> standard ACPI devices.
>
> +config EC_LENOVO_YOGA_C630
> + tristate "Lenovo Yoga C630 Embedded Controller driver"
> + depends on I2C
> + help
> + Driver for the Embedded Controller in the Qualcomm Snapdragon-based
> + Lenovo Yoga C630, which provides battery and power adapter
> + information.
> +
> + This driver provides battery and AC status support for the mentioned
> + laptop where this information is not properly exposed via the
> + standard ACPI devices.
> +
> + Say M or Y here to include this support.
> +
> endif # ARM64_PLATFORM_DEVICES
> diff --git a/drivers/platform/arm64/Makefile b/drivers/platform/arm64/Makefile
> index 4fcc9855579b..b2ae9114fdd8 100644
> --- a/drivers/platform/arm64/Makefile
> +++ b/drivers/platform/arm64/Makefile
> @@ -6,3 +6,4 @@
> #
>
> obj-$(CONFIG_EC_ACER_ASPIRE1) += acer-aspire1-ec.o
> +obj-$(CONFIG_EC_LENOVO_YOGA_C630) += lenovo-yoga-c630.o
> diff --git a/drivers/platform/arm64/lenovo-yoga-c630.c b/drivers/platform/arm64/lenovo-yoga-c630.c
> new file mode 100644
> index 000000000000..3d1d5acde807
> --- /dev/null
> +++ b/drivers/platform/arm64/lenovo-yoga-c630.c
> @@ -0,0 +1,279 @@
> +// 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/i2c.h>
> +#include <linux/module.h>
> +#include <linux/notifier.h>
> +#include <linux/platform_data/lenovo-yoga-c630.h>
> +
> +#define LENOVO_EC_RESPONSE_REG 0x01
> +#define LENOVO_EC_REQUEST_REG 0x02
> +
> +#define LENOVO_EC_UCSI_WRITE 0x20
> +#define LENOVO_EC_UCSI_READ 0x21
> +
> +#define LENOVO_EC_READ_REG 0xb0
> +#define LENOVO_EC_REQUEST_NEXT_EVENT 0x84
> +
> +struct yoga_c630_ec {
> + struct i2c_client *client;
> + struct mutex lock;
> + struct blocking_notifier_head notifier_list;
> +};
> +
> +static int yoga_c630_ec_request(struct yoga_c630_ec *ec, u8 *req, size_t req_len,
> + u8 *resp, size_t resp_len)
> +{
> + int ret;
> +
> + WARN_ON(!mutex_is_locked(&ec->lock));
> +
> + ret = i2c_smbus_write_i2c_block_data(ec->client, LENOVO_EC_REQUEST_REG,
> + req_len, req);
> + if (ret < 0)
> + return ret;
> +
> + return i2c_smbus_read_i2c_block_data(ec->client, LENOVO_EC_RESPONSE_REG,
> + resp_len, resp);
> +}
> +
> +int yoga_c630_ec_read8(struct yoga_c630_ec *ec, u8 addr)
> +{
> + u8 req[2] = { LENOVO_EC_READ_REG, };
> + int ret;
> + u8 val;
> +
> + mutex_lock(&ec->lock);
> + req[1] = addr;
> + ret = yoga_c630_ec_request(ec, req, sizeof(req), &val, 1);
> + mutex_unlock(&ec->lock);
> +
> + return ret < 0 ? ret : val;
> +}
> +EXPORT_SYMBOL_GPL(yoga_c630_ec_read8);
> +
> +int yoga_c630_ec_read16(struct yoga_c630_ec *ec, u8 addr)
> +{
> + u8 req[2] = { LENOVO_EC_READ_REG, };
> + int ret;
> + u8 msb;
> + u8 lsb;
> +
> + mutex_lock(&ec->lock);
> +
> + req[1] = addr;
> + ret = yoga_c630_ec_request(ec, req, sizeof(req), &lsb, 1);
> + if (ret < 0)
> + goto out;
> +
> + req[1] = addr + 1;
> + ret = yoga_c630_ec_request(ec, req, sizeof(req), &msb, 1);
> +
> +out:
> + mutex_unlock(&ec->lock);
> +
> + return ret < 0 ? ret : msb << 8 | lsb;
> +}
> +EXPORT_SYMBOL_GPL(yoga_c630_ec_read16);
> +
> +u16 yoga_c630_ec_ucsi_get_version(struct yoga_c630_ec *ec)
> +{
> + u8 req[3] = { 0xb3, 0xf2, 0x20};
You have a define above for the read_reg and write_reg commands, could
you not define 0xb3 as LENOVO_EC_GET_VERSION ?
All of the other commands here seem to have a named define.
> + int ret;
> + u8 msb;
> + u8 lsb;
> +
> + mutex_lock(&ec->lock);
> + ret = yoga_c630_ec_request(ec, req, sizeof(req), &lsb, 1);
> + if (ret < 0)
> + goto out;
> +
> + req[2]++;
why not set reg[2] = 0x21;
also is req[2] some kind of address ?
> + ret = yoga_c630_ec_request(ec, req, sizeof(req), &msb, 1);
> +
> +out:
> + mutex_unlock(&ec->lock);
> +
> + return ret < 0 ? ret : msb << 8 | lsb;
> +}
> +EXPORT_SYMBOL_GPL(yoga_c630_ec_ucsi_get_version);
> +
> +int yoga_c630_ec_ucsi_write(struct yoga_c630_ec *ec,
> + const u8 req[YOGA_C630_UCSI_WRITE_SIZE])
> +{
> + int ret;
> +
> + mutex_lock(&ec->lock);
> + ret = i2c_smbus_write_i2c_block_data(ec->client, LENOVO_EC_UCSI_WRITE,
> + YOGA_C630_UCSI_WRITE_SIZE, req);
> + mutex_unlock(&ec->lock);
> +
> + return ret < 0 ? ret : 0;
> +}
> +EXPORT_SYMBOL_GPL(yoga_c630_ec_ucsi_write);
> +
> +int yoga_c630_ec_ucsi_read(struct yoga_c630_ec *ec,
> + u8 resp[YOGA_C630_UCSI_READ_SIZE])
> +{
> + int ret;
> +
> + mutex_lock(&ec->lock);
> + ret = i2c_smbus_read_i2c_block_data(ec->client, LENOVO_EC_UCSI_READ,
> + YOGA_C630_UCSI_READ_SIZE, resp);
> + mutex_unlock(&ec->lock);
> +
> + return ret < 0 ? ret : 0;
> +}
> +EXPORT_SYMBOL_GPL(yoga_c630_ec_ucsi_read);
> +
> +static irqreturn_t yoga_c630_ec_intr(int irq, void *data)
> +{
> + u8 req[] = { LENOVO_EC_REQUEST_NEXT_EVENT };
> + struct yoga_c630_ec *ec = data;
> + u8 event;
> + int ret;
> +
> + mutex_lock(&ec->lock);
> + ret = yoga_c630_ec_request(ec, req, sizeof(req), &event, 1);
> + mutex_unlock(&ec->lock);
> + if (ret < 0)
> + return IRQ_HANDLED;
> +
> + pr_info("NOTIFY %x\n", event);
why not dev_info() ?
---
bod
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