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Mon, 06 Jul 2026 11:47:14 -0700 (PDT) Received: from juillet.box.freepro.com ([2a05:6e02:1041:c10:b077:843a:5587:be05]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493e0078d56sm3858625e9.8.2026.07.06.11.47.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Jul 2026 11:47:13 -0700 (PDT) From: Daniel Lezcano To: sre@kernel.org, hansg@kernel.org, ilpo.jarvinen@linux.intel.com, linux@roeck-us.net, andersson@kernel.org, konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: bryan.odonoghue@linaro.org, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, neil.armstrong@linaro.org, gaurav.kohli@oss.qualcomm.com, manaf.pallikunhi@oss.qualcomm.com, priyansh.jain@oss.qualcomm.com Subject: [PATCH v5 2/3] platform: arm64: lenovo-thinkpad-t14s-ec: Add hwmon support for temperatures Date: Mon, 6 Jul 2026 20:46:47 +0200 Message-ID: <20260706184648.35613-3-daniel.lezcano@oss.qualcomm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260706184648.35613-1-daniel.lezcano@oss.qualcomm.com> References: <20260706184648.35613-1-daniel.lezcano@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; 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The driver now registers a hwmon device providing access to six EC temperature sensors corresponding to the SoC, keyboard area, base cover, PMIC/charging circuitry, QTM module and SSD. Sensor labels are exported to allow user space to identify each measurement. This allows standard monitoring tools such as lm-sensors to report platform temperatures. Reviewed-by: Ilpo Järvinen Tested-by: Neil Armstrong # on T14s OLED Signed-off-by: Daniel Lezcano daniel.lezcano@oss.qualcomm.com --- drivers/platform/arm64/Kconfig | 1 + drivers/platform/arm64/lenovo-thinkpad-t14s.c | 131 ++++++++++++++++++ 2 files changed, 132 insertions(+) diff --git a/drivers/platform/arm64/Kconfig b/drivers/platform/arm64/Kconfig index 10f905d7d6bf..121043348740 100644 --- a/drivers/platform/arm64/Kconfig +++ b/drivers/platform/arm64/Kconfig @@ -75,6 +75,7 @@ config EC_LENOVO_THINKPAD_T14S depends on ARCH_QCOM || COMPILE_TEST depends on I2C depends on INPUT + depends on HWMON select INPUT_SPARSEKMAP select LEDS_CLASS select NEW_LEDS diff --git a/drivers/platform/arm64/lenovo-thinkpad-t14s.c b/drivers/platform/arm64/lenovo-thinkpad-t14s.c index 5590302a5694..fc480f093238 100644 --- a/drivers/platform/arm64/lenovo-thinkpad-t14s.c +++ b/drivers/platform/arm64/lenovo-thinkpad-t14s.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -21,6 +22,7 @@ #include #include #include +#include #define T14S_EC_CMD_ECRD 0x02 #define T14S_EC_CMD_ECWR 0x03 @@ -67,6 +69,13 @@ #define T14S_EC_EVT_KEY_FN_F11 0x7a #define T14S_EC_EVT_KEY_FN_G 0x7e +#define T14S_EC_SYS_THERM0 0x78 /* SoC (CPU+GPU) */ +#define T14S_EC_SYS_THERM1 0x79 /* Keyboard */ +#define T14S_EC_SYS_THERM2 0x7a /* Back cover */ +#define T14S_EC_SYS_THERM3 0x7b /* Charger / PMIC */ +#define T14S_EC_SYS_THERM6 0x7c /* QTM West */ +#define T14S_EC_SYS_THERM7 0x7d /* SSD */ + /* Hardware LED blink rate is 1 Hz (500ms off, 500ms on) */ #define T14S_EC_BLINK_RATE_ON_OFF_MS 500 @@ -93,9 +102,19 @@ struct t14s_ec_led_classdev { struct t14s_ec *ec; }; +struct t14s_ec_hwmon_sys_thermx { + const char *label; + int reg; +}; + +struct t14s_ec_hwmon { + struct t14s_ec_hwmon_sys_thermx *sys_thermx; +}; + struct t14s_ec { struct regmap *regmap; struct device *dev; + struct t14s_ec_hwmon ec_hwmon; struct t14s_ec_led_classdev led_pwr_btn; struct t14s_ec_led_classdev led_chrg_orange; struct t14s_ec_led_classdev led_chrg_white; @@ -555,6 +574,114 @@ static irqreturn_t t14s_ec_irq_handler(int irq, void *data) return IRQ_HANDLED; } +static umode_t t14s_ec_hwmon_is_visible(const void *drvdata, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + case hwmon_temp: + if (attr == hwmon_temp_input || + attr == hwmon_temp_label) + return 0444; + break; + default: + return 0; + } + + return 0; +} + +static int t14s_ec_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, const char **str) +{ + struct t14s_ec *ec = dev_get_drvdata(dev); + + switch (type) { + case hwmon_temp: + if (attr == hwmon_temp_label) { + *str = ec->ec_hwmon.sys_thermx[channel].label; + return 0; + } + break; + default: + return -EOPNOTSUPP; + } + + return -EOPNOTSUPP; +} + +static int t14s_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct t14s_ec *ec = dev_get_drvdata(dev); + unsigned int value; + int ret; + + switch (type) { + case hwmon_temp: + if (attr == hwmon_temp_input) { + ret = t14s_ec_read(ec, ec->ec_hwmon.sys_thermx[channel].reg, &value); + if (ret) + return ret; + *val = value * MILLIDEGREE_PER_DEGREE; + + return 0; + } + break; + default: + return -EOPNOTSUPP; + } + + return -EOPNOTSUPP; +} + +static const struct hwmon_ops t14s_ec_hwmon_ops = { + .is_visible = t14s_ec_hwmon_is_visible, + .read = t14s_ec_hwmon_read, + .read_string = t14s_ec_hwmon_read_string, +}; + +static const struct hwmon_channel_info *t14s_ec_hwmon_info[] = { + HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), + HWMON_CHANNEL_INFO(temp, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL), + NULL +}; + +static const struct hwmon_chip_info t14s_ec_chip_info = { + .ops = &t14s_ec_hwmon_ops, + .info = t14s_ec_hwmon_info, +}; + +static int t14s_ec_hwmon_probe(struct t14s_ec *ec) +{ + struct device *dev; + struct t14s_ec_hwmon_sys_thermx sys_thermx[] = { + { .label = "soc", .reg = T14S_EC_SYS_THERM0 }, + { .label = "keyboard", .reg = T14S_EC_SYS_THERM1 }, + { .label = "base", .reg = T14S_EC_SYS_THERM2 }, + { .label = "charging", .reg = T14S_EC_SYS_THERM3 }, + { .label = "qtm", .reg = T14S_EC_SYS_THERM6 }, + { .label = "ssd", .reg = T14S_EC_SYS_THERM7 }, + }; + + ec->ec_hwmon.sys_thermx = devm_kmemdup_array(ec->dev, sys_thermx, + ARRAY_SIZE(sys_thermx), + sizeof(sys_thermx[0]), GFP_KERNEL); + if (!ec->ec_hwmon.sys_thermx) + return -ENOMEM; + + dev = devm_hwmon_device_register_with_info(ec->dev, "t14s_ec", ec, + &t14s_ec_chip_info, NULL); + + return PTR_ERR_OR_ZERO(dev); +} + static int t14s_ec_probe(struct i2c_client *client) { struct device *dev = &client->dev; @@ -590,6 +717,10 @@ static int t14s_ec_probe(struct i2c_client *client) if (ret < 0) return ret; + ret = t14s_ec_hwmon_probe(ec); + if (ret < 0) + return ret; + ret = devm_request_threaded_irq(dev, client->irq, NULL, t14s_ec_irq_handler, IRQF_ONESHOT, dev_name(dev), ec); -- 2.53.0