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Wed, 01 Jul 2026 03:37:18 -0700 (PDT) Received: from juillet.box.freepro.com ([2a05:6e02:1041:c10:cab:bdb4:a76b:614]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493be4d2bc5sm69130655e9.5.2026.07.01.03.37.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Jul 2026 03:37:18 -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 Subject: [PATCH v3 1/2] platform: arm64: lenovo-thinkpad-t14s-ec: Add hwmon support for temperatures Date: Wed, 1 Jul 2026 12:37:10 +0200 Message-ID: <20260701103714.22583-2-daniel.lezcano@oss.qualcomm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260701103714.22583-1-daniel.lezcano@oss.qualcomm.com> References: <20260701103714.22583-1-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-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzAxMDExMCBTYWx0ZWRfXyBm0iO9GEQng N2y4iy0AjaLDbi/q3tmAesKdgRzI2tWfNpWlrGtv/1dyD0TAeJ+srIZGzod8OhBrKCzY7bwQ8As l1g9QgGWFYW37fM4qmiJGXjk1PGzc4U= X-Proofpoint-GUID: 80p2_h_U43lB2JLe2z9lXHYqxhK2xlI7 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzAxMDExMCBTYWx0ZWRfXzH4xatJuH04R mCjg3x294RfYBbeJbexLyyjlWtRMjXq81Pl/2vIT9X94Ww1O8oHH2HQl5M8lb+6voPhwjSMJXjF WThlEYX0ICl+lcGEW0eE0/i+ioa2xfgWJu8FyQvVLBRafkxSSpnLOOAsZ2ZWyydv6CRMkJCBe65 RW89Ocez7tCZZsMnjvZt3t/KF2HTRGnXNrQMWf1rQJlDhNHzGNlz19uSpS7dT+BUXob8HaS9Mf/ vo3yE3kGUH7Xn4jueSuJyM/sqEiFL9JK01ptEqvGOvZk2cL/iiaYJBoyJSYtK0N8CzJMpbUNQHz 3mp5hUKoMS1An/41E5/GIxt3YA3XFtC5ZXJ7DTT5Lr9A2FQDWAU2m2ak6CDsYTdY2nHrKQJIf67 eB5ftkyKAiaV4U6Z+mvTQaWjBjRis+oS/Az1OmHLMxQAmIQuq+76CxZ/vB1xel8UbwLMeKAMEST Dj4WqrbEbEkpRVo4FOw== X-Proofpoint-ORIG-GUID: 80p2_h_U43lB2JLe2z9lXHYqxhK2xlI7 X-Authority-Analysis: v=2.4 cv=PbLPQChd c=1 sm=1 tr=0 ts=6a44eddf cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=xqWC_Br6kY4A:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=O3gN3AO8kzc7p6n7zlUA:9 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-07-01_03,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 clxscore=1015 impostorscore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 phishscore=0 malwarescore=0 adultscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607010110 Expose the Lenovo ThinkPad T14s EC environmental sensors through the hwmon subsystem. 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. Signed-off-by: Daniel Lezcano daniel.lezcano@oss.qualcomm.com --- drivers/platform/arm64/lenovo-thinkpad-t14s.c | 130 ++++++++++++++++++ 1 file changed, 130 insertions(+) diff --git a/drivers/platform/arm64/lenovo-thinkpad-t14s.c b/drivers/platform/arm64/lenovo-thinkpad-t14s.c index 5590302a5694..c9917a1d2bd7 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 +574,113 @@ 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(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 +716,10 @@ 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