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Sun, 16 Mar 2025 20:51:23 -0700 (PDT) Received: from google.com ([2401:fa00:1:10:77b5:e0b8:95d2:83db]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-af56e9ddf44sm6193099a12.18.2025.03.16.20.51.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 Mar 2025 20:51:22 -0700 (PDT) Date: Mon, 17 Mar 2025 11:51:19 +0800 From: "Sung-Chi, Li" To: Thomas =?iso-8859-1?Q?Wei=DFschuh?= Cc: Jean Delvare , Guenter Roeck , Benson Leung , Guenter Roeck , chrome-platform@lists.linux.dev, linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/3] hwmon: (cros_ec) Add reading target fan RPM function Message-ID: References: <20250313-extend_ec_hwmon_fan-v1-0-5c566776f2c4@chromium.org> <20250313-extend_ec_hwmon_fan-v1-2-5c566776f2c4@chromium.org> <782e6319-2082-4f05-9987-fa68439701ef@t-8ch.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <782e6319-2082-4f05-9987-fa68439701ef@t-8ch.de> On Thu, Mar 13, 2025 at 05:24:28PM +0100, Thomas Weißschuh wrote: > On 2025-03-13 12:47:43+0800, Sung-Chi Li wrote: > > Implement the functionality of reading the target fan RPM setting from > > ChromeOS embedded controller under framework. > > > > Signed-off-by: Sung-Chi Li > > --- > > drivers/hwmon/cros_ec_hwmon.c | 18 ++++++++++++++++++ > > 1 file changed, 18 insertions(+) > > > > diff --git a/drivers/hwmon/cros_ec_hwmon.c b/drivers/hwmon/cros_ec_hwmon.c > > index b2fec0768301f116f49c57b8dbfb042b98a573e1..73bfcbbaf9531be6b753cfef8045fd5dab5b2ab3 100644 > > --- a/drivers/hwmon/cros_ec_hwmon.c > > +++ b/drivers/hwmon/cros_ec_hwmon.c > > @@ -36,6 +36,19 @@ static int cros_ec_hwmon_read_fan_speed(struct cros_ec_device *cros_ec, u8 index > > return 0; > > } > > > > +static int cros_ec_hwmon_read_fan_target(struct cros_ec_device *cros_ec, u8 index, int32_t *speed) > > int32_t is a userspace type. In the kernel use i32, or even better u32. > Sorry for missing this important detail, I will not use userspace type for following changes. > > +{ > > + int ret; > > + struct ec_response_pwm_get_fan_rpm r; > > Switch the variable declarations around. > Also call the request "req". > > > + > > + ret = cros_ec_cmd(cros_ec, 0, EC_CMD_PWM_GET_FAN_TARGET_RPM, NULL, 0, &r, sizeof(r)); > > + if (ret < 0) > > + return ret; > > + > > + *speed = le32_to_cpu(r.rpm); > > r.rpm is not marked as __le32, I'm not sure if sparse will complain > about the usage of le32_to_cpu(). > It did. Currently, all devices are running little endians on both AP and EC, so I think it is ok not to explicitly call the le32_to_cpu? > > + return 0; > > +} > > + > > static int cros_ec_hwmon_read_temp(struct cros_ec_device *cros_ec, u8 index, u8 *temp) > > { > > unsigned int offset; > > @@ -95,6 +108,7 @@ static int cros_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type, > > { > > struct cros_ec_hwmon_priv *priv = dev_get_drvdata(dev); > > int ret = -EOPNOTSUPP; > > + int32_t target_rpm; > > Also u32. > Same for the kernel type changes. > > u16 speed; > > u8 temp; > > > > @@ -111,6 +125,10 @@ static int cros_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type, > > ret = cros_ec_hwmon_read_fan_speed(priv->cros_ec, channel, &speed); > > if (ret == 0) > > *val = cros_ec_hwmon_is_error_fan(speed); > > + } else if (attr == hwmon_fan_target) { > > + ret = cros_ec_hwmon_read_fan_target(priv->cros_ec, channel, &target_rpm); > > + if (ret == 0) > > + *val = target_rpm; > > } > > } else if (type == hwmon_temp) { > > if (attr == hwmon_temp_input) { > > > > -- > > 2.49.0.rc0.332.g42c0ae87b1-goog > >