[2/2] hwmon: Add AMS AS6200 temperature sensor

Message ID	63e352150ed51eefce90ca4058af5459730174b2.1702744180.git.alkuor@gmail.com (mailing list archive)
State	Changes Requested
Headers	show Received: from mail-qk1-f171.google.com (mail-qk1-f171.google.com [209.85.222.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 07D4030645; Sat, 16 Dec 2023 16:41:29 +0000 (UTC) From: Abdel Alkuor <alkuor@gmail.com> To: Jean Delvare <jdelvare@suse.com>, Guenter Roeck <linux@roeck-us.net>, Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>, Jonathan Corbet <corbet@lwn.net>, Abdel Alkuor <alkuor@gmail.com> Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 2/2] hwmon: Add AMS AS6200 temperature sensor Date: Sat, 16 Dec 2023 11:39:30 -0500 Message-Id: <63e352150ed51eefce90ca4058af5459730174b2.1702744180.git.alkuor@gmail.com> In-Reply-To: <149032e99136a9fe47c3533b57a71092646e497d.1702744180.git.alkuor@gmail.com> References: <149032e99136a9fe47c3533b57a71092646e497d.1702744180.git.alkuor@gmail.com> Precedence: bulk MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
Series	[1/2] dt-bindings: hwmon: Add AMS AS6200 temperature sensor \| expand [1/2] dt-bindings: hwmon: Add AMS AS6200 temperature sensor [2/2] hwmon: Add AMS AS6200 temperature sensor

diff --git a/Documentation/hwmon/as6200.rst b/Documentation/hwmon/as6200.rst new file mode 100644 index 000000000000..f6156c2105ff --- /dev/null +++ b/Documentation/hwmon/as6200.rst @@ -0,0 +1,50 @@ +Kernel driver as6200 +==================== + +Supported chips: + + * AMS OSRAM AS6200 + + Prefix: 'as6200' + + Addresses scanned: none + + Datasheet: https://ams.com/documents/20143/36005/AS6200_DS000449_4-00.pdf + +Author: + + Abdel Alkuor <alkuor@gmail.com> + +Description +----------- +The AS6200 IC is a temperature sensor with a range between -40°C and 125°C. +It supports ultra-low power consumption (low operation and quiescent current) +which makes it ideally suited for mobile/battery powered applications. +Additionally the AS6200 temperature sensor system also features an alert +functionality, which triggers an interrupt to protect devices from excessive +temperatures. + +The sensor has an accuracy of ±0.4°C between 0°C and 60°C and has an accuracy +of 1.0°C from -40°C to +125°C, with Resolution of 0.0625°C. The sensor +supports conversion rate of 0.25, 1, 4, 8 Hz, and consecutive fault counts of +1, 2, 4, 6 samples which triggers/clears an alert when high/low temperature +is detected respectively. Two alert modes are supported, interrupt mode and +comparator mode. + +Configuration Notes +------------------- +By default as6200 driver reads the temperature continuously at 8Hz. +Consecutive faults is set to 6 samples with true polarity which an +alert is set when the current temperaute goes above high temperature +theshold and is cleared when it falls below the low temperature threshold. +Alert is configured in comparator mode. + +Interrupt is supported for the alert where user space is notified +when alert is set/cleared. + +sysfs-Interface +--------------- +temp#_input temperature input (read-only) +temp#_alert alert flag (read-only) +temp#_max temperature maximum setpoint (read/write) +temp#_max_hyst hysteresis for temperature maximum (read/write) diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index cf27523eed5a..f6edcbf1b7cf 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -287,6 +287,16 @@ config SENSORS_AS370 This driver can also be built as a module. If so, the module will be called as370-hwmon. +config SENSORS_AS6200 + tristate "AMS AS6200 temperature sensor" + depends on I2C + select REGMAP_I2C + help + If you say yes here you get support for AMS AS6200 + temperature sensor. + + This driver can also be built as a module. If so, the module + will be called as6200. config SENSORS_ASC7621 tristate "Andigilog aSC7621" diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index e84bd9685b5c..11fe2b7a80a9 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -53,6 +53,7 @@ obj-$(CONFIG_SENSORS_AQUACOMPUTER_D5NEXT) += aquacomputer_d5next.o obj-$(CONFIG_SENSORS_ARM_SCMI) += scmi-hwmon.o obj-$(CONFIG_SENSORS_ARM_SCPI) += scpi-hwmon.o obj-$(CONFIG_SENSORS_AS370) += as370-hwmon.o +obj-$(CONFIG_SENSORS_AS6200) += as6200.o obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o obj-$(CONFIG_SENSORS_ASPEED) += aspeed-pwm-tacho.o obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o diff --git a/drivers/hwmon/as6200.c b/drivers/hwmon/as6200.c new file mode 100644 index 000000000000..173f86e48ee1 --- /dev/null +++ b/drivers/hwmon/as6200.c @@ -0,0 +1,249 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for AMS AS6200 Temperature sensor + * + * Author: Abdel Alkuor <alkuor@gmail.com> + */ + +#include <linux/bitfield.h> +#include <linux/device.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/regmap.h> + +#include <linux/hwmon.h> + +#define AS6200_TVAL_REG 0x0 +#define AS6200_CONFIG_REG 0x1 +#define AS6200_TLOW_REG 0x2 +#define AS6200_THIGH_REG 0x3 + +#define AS6200_CONFIG_AL BIT(5) +#define AS6200_CONFIG_CR GENMASK(7, 6) +#define AS6200_CONFIG_SM BIT(8) +#define AS6200_CONFIG_IM BIT(9) +#define AS6200_CONFIG_POL BIT(10) +#define AS6200_CONFIG_CF GENMASK(12, 11) + +#define AS6200_TEMP_MASK GENMASK(15, 4) +#define AS6200_DEFAULT_CONFIG (AS6200_CONFIG_CR |\ + AS6200_CONFIG_CF |\ + AS6200_CONFIG_POL) + +static const struct regmap_config as6200_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .max_register = AS6200_THIGH_REG, +}; + +static irqreturn_t as6200_event_handler(int irq, void *private) +{ + struct device *hwmon_dev = private; + + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_alarm, 0); + return IRQ_HANDLED; +} + +static int as6200_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct regmap *regmap = dev_get_drvdata(dev); + unsigned int regval; + unsigned int reg; + s32 temp; + int ret; + + switch (attr) { + case hwmon_temp_input: + reg = AS6200_TVAL_REG; + break; + case hwmon_temp_max_hyst: + reg = AS6200_TLOW_REG; + break; + case hwmon_temp_max: + reg = AS6200_THIGH_REG; + break; + case hwmon_temp_alarm: + reg = AS6200_CONFIG_REG; + break; + default: + return -EOPNOTSUPP; + } + + ret = regmap_read(regmap, reg, &regval); + if (ret) + return ret; + + if (reg == AS6200_CONFIG_REG) { + *val = FIELD_GET(AS6200_CONFIG_AL, regval); + } else { + temp = sign_extend32(FIELD_GET(AS6200_TEMP_MASK, regval), 11); + *val = DIV_ROUND_CLOSEST(temp * 625, 10); + } + + return 0; +} + +static int as6200_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + struct regmap *regmap = dev_get_drvdata(dev); + int reg; + + switch (attr) { + case hwmon_temp_max_hyst: + reg = AS6200_TLOW_REG; + break; + case hwmon_temp_max: + reg = AS6200_THIGH_REG; + break; + default: + return -EOPNOTSUPP; + } + + val = clamp_val(val, -40000, 125000) * 16 / 1000; + return regmap_write(regmap, reg, FIELD_PREP(AS6200_TEMP_MASK, val)); +} + +static umode_t as6200_is_visible(const void *data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + if (type != hwmon_temp) + return 0; + + switch (attr) { + case hwmon_temp_input: + case hwmon_temp_alarm: + return 0444; + case hwmon_temp_max_hyst: + case hwmon_temp_max: + return 0644; + default: + return 0; + } +} + +static const struct hwmon_ops as6200_hwmon_ops = { + .is_visible = as6200_is_visible, + .read = as6200_read, + .write = as6200_write, +}; + +static const struct hwmon_channel_info * const as6200_info[] = { + HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), + HWMON_CHANNEL_INFO(temp, + HWMON_T_INPUT | HWMON_T_MAX | + HWMON_T_MAX_HYST | HWMON_T_ALARM), + NULL +}; + +struct hwmon_chip_info as6200_chip_info = { + .ops = &as6200_hwmon_ops, + .info = as6200_info +}; + +static int as6200_probe(struct i2c_client *client) +{ + struct regmap *regmap; + struct device *hwmon_dev; + struct device *dev = &client->dev; + int ret; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) + return -EINVAL; + + regmap = devm_regmap_init_i2c(client, &as6200_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + ret = devm_regulator_get_enable(dev, "vdd"); + if (ret) + return dev_err_probe(dev, ret, + "Could not get and enable regulator %d\n", + ret); + + ret = regmap_write(regmap, AS6200_CONFIG_REG, AS6200_DEFAULT_CONFIG); + if (ret) + return ret; + + hwmon_dev = devm_hwmon_device_register_with_info(dev, "as6200", + regmap, + &as6200_chip_info, + NULL); + if (IS_ERR(hwmon_dev)) + return PTR_ERR(hwmon_dev); + + if (client->irq) { + ret = devm_request_threaded_irq(dev, + client->irq, + NULL, + &as6200_event_handler, + IRQF_ONESHOT, + client->name, + hwmon_dev); + if (ret) + return ret; + } + + i2c_set_clientdata(client, regmap); + + return 0; +} + +static int __maybe_unused as6200_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct regmap *regmap = i2c_get_clientdata(client); + + if (client->irq) + disable_irq(client->irq); + + return regmap_update_bits(regmap, AS6200_CONFIG_REG, + AS6200_CONFIG_SM, AS6200_CONFIG_SM); +} + +static int __maybe_unused as6200_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct regmap *regmap = i2c_get_clientdata(client); + int ret; + + ret = regmap_update_bits(regmap, AS6200_CONFIG_REG, AS6200_CONFIG_SM, 0); + if (ret) + return ret; + + if (client->irq) + enable_irq(client->irq); + + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(as6200_pm_ops, as6200_suspend, as6200_resume); + +static const struct i2c_device_id as6200_id_table[] = { + { "as6200", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, as6200_id_table); + +static const struct of_device_id as6200_of_match[] = { + { .compatible = "ams,as6200" }, + { } +}; +MODULE_DEVICE_TABLE(of, as6200_of_match); + +static struct i2c_driver as6200_driver = { + .driver = { + .name = "as6200", + .pm = pm_sleep_ptr(&as6200_pm_ops), + .of_match_table = as6200_of_match, + }, + .probe = as6200_probe, + .id_table = as6200_id_table, +}; +module_i2c_driver(as6200_driver); + +MODULE_AUTHOR("Abdel Alkuor <alkuor@gmail.com"); +MODULE_DESCRIPTION("AMS AS6200 Temperature Sensor"); +MODULE_LICENSE("GPL");

[2/2] hwmon: Add AMS AS6200 temperature sensor

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