From patchwork Thu Aug 17 14:29:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Carsten_Spie=C3=9F?= X-Patchwork-Id: 13356555 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E1362C3062E for ; Thu, 17 Aug 2023 14:30:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351922AbjHQOaH (ORCPT ); Thu, 17 Aug 2023 10:30:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351937AbjHQO3r (ORCPT ); Thu, 17 Aug 2023 10:29:47 -0400 Received: from wp534.webpack.hosteurope.de (wp534.webpack.hosteurope.de [80.237.130.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EC26F1FFF; Thu, 17 Aug 2023 07:29:44 -0700 (PDT) Received: from [2001:a61:623e:e40:c80a:ff:fe00:409d] (helo=cs-wrt.lan.local); authenticated by wp534.webpack.hosteurope.de running ExIM with esmtpa id 1qWe0I-0004jV-Ki; Thu, 17 Aug 2023 16:29:38 +0200 From: =?utf-8?q?Carsten_Spie=C3=9F?= To: =?utf-8?q?Carsten_Spie=C3=9F?= , Jean Delvare , Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet , Geert Uytterhoeven , Magnus Damm Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v4 1/2] hwmon: (isl28022) new driver for ISL28022 power monitor Date: Thu, 17 Aug 2023 16:29:20 +0200 Message-Id: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 X-bounce-key: webpack.hosteurope.de;mail@carsten-spiess.de;1692282585;faac8e82; X-HE-SMSGID: 1qWe0I-0004jV-Ki Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Driver for Renesas ISL28022 power monitor with I2C interface. The device monitors voltage, current via shunt resistor and calculated power. Signed-off-by: Carsten Spieß --- v4: - no changes v3: - changelog added v2/v3: - hwmon input shunt voltage removed - debugfs for shunt voltage read access added - missing error handling added - shunt resistor minimum and default value added - properties reworked - device_property_* instead of_property fixed - possible overflows fixed - MAINTAINERS order fixed - documentation updated --- Documentation/hwmon/index.rst | 1 + Documentation/hwmon/isl28022.rst | 63 ++++ MAINTAINERS | 7 + drivers/hwmon/Kconfig | 11 + drivers/hwmon/Makefile | 1 + drivers/hwmon/isl28022.c | 496 +++++++++++++++++++++++++++++++ 6 files changed, 579 insertions(+) create mode 100644 Documentation/hwmon/isl28022.rst create mode 100644 drivers/hwmon/isl28022.c diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index d11924667f76..c9548fc5c40e 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -90,6 +90,7 @@ Hardware Monitoring Kernel Drivers ir35221 ir38064 ir36021 + isl28022 isl68137 it87 jc42 diff --git a/Documentation/hwmon/isl28022.rst b/Documentation/hwmon/isl28022.rst new file mode 100644 index 000000000000..8d4422a2dacd --- /dev/null +++ b/Documentation/hwmon/isl28022.rst @@ -0,0 +1,63 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +Kernel driver isl28022 +====================== + +Supported chips: + + * Renesas ISL28022 + + Prefix: 'isl28022' + + Addresses scanned: none + + Datasheet: Publicly available at the Renesas website + + https://www.renesas.com/us/en/www/doc/datasheet/isl28022.pdf + +Author: + Carsten Spieß + +Description +----------- + +The ISL28022 is a power monitor with I2C interface. The device monitors +voltage, current via shunt resistor and calculated power. + +Usage Notes +----------- + +This driver does not auto-detect devices. You will have to instantiate the +device explicitly. Please see Documentation/i2c/instantiating-devices.rst for +details. + +The shunt value in micro-ohms, shunt voltage range and averaging can be set +with device properties. +Please refer to the Documentation/devicetree/bindings/hwmon/isl,isl28022.yaml +for bindings if the device tree is used. + +The driver supports only shunt and bus continuous ADC mode at 15bit resolution. +Averaging can be set from 1 to 128 samples (power of 2) on both channels. +Shunt voltage range of 40, 80, 160 or 320mV is allowed +The bus voltage range is 60V fixed. + +Sysfs entries +------------- + +The following attributes are supported. All attributes are read-only. + +======================= ======================================================= +in0_input bus voltage (milli Volt) + +curr1_input current (milli Ampere) +power1_input power (micro Watt) +======================= ======================================================= + +Debugfs entries +--------------- + +The following attributes are supported. All attributes are read-only. + +======================= ======================================================= +shunt_voltage shunt voltage (micro Volt) +======================= ======================================================= diff --git a/MAINTAINERS b/MAINTAINERS index 7abb5710e1bb..b02e3b991676 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11065,6 +11065,13 @@ F: drivers/isdn/Makefile F: drivers/isdn/hardware/ F: drivers/isdn/mISDN/ +ISL28022 HARDWARE MONITORING DRIVER +M: Carsten Spieß +L: linux-hwmon@vger.kernel.org +S: Maintained +F: Documentation/hwmon/isl28022.rst +F: drivers/hwmon/isl28022.c + ISOFS FILESYSTEM M: Jan Kara L: linux-fsdevel@vger.kernel.org diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 2913299c2c9e..3049c519e6ac 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -800,6 +800,17 @@ config SENSORS_CORETEMP sensor inside your CPU. Most of the family 6 CPUs are supported. Check Documentation/hwmon/coretemp.rst for details. +config SENSORS_ISL28022 + tristate "Renesas ISL28022" + depends on I2C + select REGMAP_I2C + help + If you say yes here you get support for ISL28022 power monitor. + Check Documentation/hwmon/isl28022.rst for details. + + This driver can also be built as a module. If so, the module + will be called isl28022. + config SENSORS_IT87 tristate "ITE IT87xx and compatibles" depends on !PPC diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index ff6bfd109c72..4046fed7f48d 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -98,6 +98,7 @@ obj-$(CONFIG_SENSORS_INA2XX) += ina2xx.o obj-$(CONFIG_SENSORS_INA238) += ina238.o obj-$(CONFIG_SENSORS_INA3221) += ina3221.o obj-$(CONFIG_SENSORS_INTEL_M10_BMC_HWMON) += intel-m10-bmc-hwmon.o +obj-$(CONFIG_SENSORS_ISL28022) += isl28022.o obj-$(CONFIG_SENSORS_IT87) += it87.o obj-$(CONFIG_SENSORS_JC42) += jc42.o obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o diff --git a/drivers/hwmon/isl28022.c b/drivers/hwmon/isl28022.c new file mode 100644 index 000000000000..18b4481d5ff6 --- /dev/null +++ b/drivers/hwmon/isl28022.c @@ -0,0 +1,496 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * isl28022.c - driver for Renesas ISL28022 power monitor chip monitoring + * + * Copyright (c) 2023 Carsten Spieß + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* ISL28022 registers */ +#define ISL28022_REG_CONFIG 0x00 +#define ISL28022_REG_SHUNT 0x01 +#define ISL28022_REG_BUS 0x02 +#define ISL28022_REG_POWER 0x03 +#define ISL28022_REG_CURRENT 0x04 +#define ISL28022_REG_CALIB 0x05 +#define ISL28022_REG_SHUNT_THR 0x06 +#define ISL28022_REG_BUS_THR 0x07 +#define ISL28022_REG_INT 0x08 +#define ISL28022_REG_AUX 0x09 +#define ISL28022_REG_MAX ISL28022_REG_AUX + +/* ISL28022 config flags */ +/* mode flags */ +#define ISL28022_MODE_SHIFT 0 +#define ISL28022_MODE_MASK 0x0007 + +#define ISL28022_MODE_PWR_DOWN 0x0 +#define ISL28022_MODE_TRG_S 0x1 +#define ISL28022_MODE_TRG_B 0x2 +#define ISL28022_MODE_TRG_SB 0x3 +#define ISL28022_MODE_ADC_OFF 0x4 +#define ISL28022_MODE_CONT_S 0x5 +#define ISL28022_MODE_CONT_B 0x6 +#define ISL28022_MODE_CONT_SB 0x7 + +/* shunt ADC settings */ +#define ISL28022_SADC_SHIFT 3 +#define ISL28022_SADC_MASK 0x0078 + +#define ISL28022_BADC_SHIFT 7 +#define ISL28022_BADC_MASK 0x0780 + +#define ISL28022_ADC_12 0x0 /* 12 bit ADC */ +#define ISL28022_ADC_13 0x1 /* 13 bit ADC */ +#define ISL28022_ADC_14 0x2 /* 14 bit ADC */ +#define ISL28022_ADC_15 0x3 /* 15 bit ADC */ +#define ISL28022_ADC_15_1 0x8 /* 15 bit ADC, 1 sample */ +#define ISL28022_ADC_15_2 0x9 /* 15 bit ADC, 2 samples */ +#define ISL28022_ADC_15_4 0xA /* 15 bit ADC, 4 samples */ +#define ISL28022_ADC_15_8 0xB /* 15 bit ADC, 8 samples */ +#define ISL28022_ADC_15_16 0xC /* 15 bit ADC, 16 samples */ +#define ISL28022_ADC_15_32 0xD /* 15 bit ADC, 32 samples */ +#define ISL28022_ADC_15_64 0xE /* 15 bit ADC, 64 samples */ +#define ISL28022_ADC_15_128 0xF /* 15 bit ADC, 128 samples */ + +/* shunt voltage range */ +#define ISL28022_PG_SHIFT 11 +#define ISL28022_PG_MASK 0x1800 + +#define ISL28022_PG_40 0x0 /* +/-40 mV */ +#define ISL28022_PG_80 0x1 /* +/-80 mV */ +#define ISL28022_PG_160 0x2 /* +/-160 mV */ +#define ISL28022_PG_320 0x3 /* +/-3200 mV */ + +/* bus voltage range */ +#define ISL28022_BRNG_SHIFT 13 +#define ISL28022_BRNG_MASK 0x6000 + +#define ISL28022_BRNG_16 0x0 /* 16 V */ +#define ISL28022_BRNG_32 0x1 /* 32 V */ +#define ISL28022_BRNG_60 0x3 /* 60 V */ + +/* reset */ +#define ISL28022_RESET 0x8000 + +struct isl28022_data { + struct i2c_client *client; + struct regmap *regmap; +#ifdef CONFIG_DEBUG_FS + struct dentry *debugfs; +#endif + u32 shunt; + u32 gain; + u32 average; + u16 config; + u16 calib; +}; + +static int isl28022_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct isl28022_data *data = dev_get_drvdata(dev); + unsigned int regval; + int err; + + switch (type) { + case hwmon_in: + switch (attr) { + case hwmon_in_input: + err = regmap_read(data->regmap, + ISL28022_REG_BUS, ®val); + if (err < 0) + return err; + /* driver supports only 60V mode (BRNG 11) */ + *val = (long)(((u16)regval) & 0xFFFC); + break; + default: + return -EINVAL; + } + break; + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + err = regmap_read(data->regmap, + ISL28022_REG_CURRENT, ®val); + if (err < 0) + return err; + *val = ((long)regval * 1250L * (long)data->gain) / + (long)data->shunt; + break; + default: + return -EINVAL; + } + break; + case hwmon_power: + switch (attr) { + case hwmon_power_input: + err = regmap_read(data->regmap, + ISL28022_REG_POWER, ®val); + if (err < 0) + return err; + *val = ((51200000L * ((long)data->gain)) / + (long)data->shunt) * (long)regval; + break; + default: + return -EINVAL; + } + break; + default: + return -EINVAL; + } + + return 0; +} + +static umode_t isl28022_is_visible(const void *data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + case hwmon_in: + switch (attr) { + case hwmon_in_input: + return 0444; + } + break; + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + return 0444; + } + break; + case hwmon_power: + switch (attr) { + case hwmon_power_input: + return 0444; + } + break; + default: + break; + } + return 0; +} + +static const struct hwmon_channel_info *isl28022_info[] = { + HWMON_CHANNEL_INFO(in, + HWMON_I_INPUT), /* channel 0: bus voltage (mV) */ + HWMON_CHANNEL_INFO(curr, + HWMON_C_INPUT), /* channel 1: current (mA) */ + HWMON_CHANNEL_INFO(power, + HWMON_P_INPUT), /* channel 1: power (µW) */ + NULL +}; + +static const struct hwmon_ops isl28022_hwmon_ops = { + .is_visible = isl28022_is_visible, + .read = isl28022_read, +}; + +static const struct hwmon_chip_info isl28022_chip_info = { + .ops = &isl28022_hwmon_ops, + .info = isl28022_info, +}; + +static bool isl28022_is_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case ISL28022_REG_CONFIG: + case ISL28022_REG_CALIB: + case ISL28022_REG_SHUNT_THR: + case ISL28022_REG_BUS_THR: + case ISL28022_REG_INT: + case ISL28022_REG_AUX: + return true; + } + + return false; +} + +static bool isl28022_is_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case ISL28022_REG_CONFIG: + case ISL28022_REG_SHUNT: + case ISL28022_REG_BUS: + case ISL28022_REG_POWER: + case ISL28022_REG_CURRENT: + case ISL28022_REG_INT: + case ISL28022_REG_AUX: + return true; + } + return true; +} + +static const struct regmap_config isl28022_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .max_register = ISL28022_REG_MAX, + .writeable_reg = isl28022_is_writeable_reg, + .volatile_reg = isl28022_is_volatile_reg, + .val_format_endian = REGMAP_ENDIAN_BIG, + .cache_type = REGCACHE_RBTREE, + .use_single_read = true, + .use_single_write = true, +}; + +static const struct i2c_device_id isl28022_ids[] = { + { "isl28022", 0}, + { /* LIST END */ } +}; +MODULE_DEVICE_TABLE(i2c, isl28022_ids); + +#ifdef CONFIG_DEBUG_FS +static int shunt_voltage_show(struct seq_file *seqf, void *unused) +{ + struct isl28022_data *data = seqf->private; + unsigned int regval; + int err; + + err = regmap_read(data->regmap, + ISL28022_REG_SHUNT, ®val); + if (err) + return err; + + /* print shunt voltage in micro volt */ + seq_printf(seqf, "%d\n", regval * 10); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(shunt_voltage); + +static struct dentry *isl28022_debugfs_root; + +static void isl28022_debugfs_remove(void *res) +{ + debugfs_remove_recursive(res); +} + +static int isl28022_debugfs_init(struct isl28022_data *data) +{ + char name[16]; + int err; + struct dentry *entry; + + scnprintf(name, sizeof(name), "%d-%04hx", data->client->adapter->nr, data->client->addr); + + data->debugfs = debugfs_create_dir(name, isl28022_debugfs_root); + if (IS_ERR(data->debugfs)) + return PTR_ERR(data->debugfs); + + err = devm_add_action_or_reset(&data->client->dev, isl28022_debugfs_remove, data->debugfs); + if (err) + return err; + + entry = debugfs_create_file("shunt_voltage", 0444, data->debugfs, data, + &shunt_voltage_fops); + if (IS_ERR(entry)) + return PTR_ERR(entry); + + return 0; +} +#endif /* CONFIG_DEBUG_FS*/ + +/* + * read property values and make consistency checks. + * + * following values for shunt range and resistor are allowed: + * 40 mV -> gain 1, shunt min. 800 micro ohms + * 80 mV -> gain 2, shunt min. 1600 micro ohms + * 160 mV -> gain 4, shunt min. 3200 micro ohms + * 320 mV -> gain 8, shunt min. 6400 micro ohms + */ +static int isl28022_read_properties(struct device *dev, struct isl28022_data *data) +{ + u32 val; + int err; + + err = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val); + if (err == -ENODATA) + val = 10000; + else if (err < 0) + return err; + data->shunt = val; + + err = device_property_read_u32(dev, "renesas,shunt-range-microvolt", &val); + if (err == -ENODATA) + val = 320000; + else if (err < 0) + return err; + switch (val) { + case 40000: + data->gain = 1; + if (data->shunt < 800) + goto shunt_invalid; + break; + case 80000: + data->gain = 2; + if (data->shunt < 1600) + goto shunt_invalid; + break; + case 160000: + data->gain = 4; + if (data->shunt < 3200) + goto shunt_invalid; + break; + case 320000: + data->gain = 8; + if (data->shunt < 6400) + goto shunt_invalid; + break; + default: + dev_err(dev, "renesas,shunt-range-microvolt invalid value %d\n", val); + return -EINVAL; + } + + err = device_property_read_u32(dev, "renesas,average-samples", &val); + if (err == -ENODATA) + val = 1; + else if (err < 0) + return err; + if ((val > 128) || (BIT(__ffs(val)) != val)) { + dev_err(dev, "renesas,average-samples invalid value %d\n", val); + return -EINVAL; + } + data->average = val; + + return 0; + +shunt_invalid: + dev_err(dev, "renesas,shunt-resistor-microvolt invalid value %d\n", data->shunt); + return -EINVAL; +} + +/* + * write configuration and calibration registers + * + * The driver supports only shunt and bus continuous ADC mode at 15bit resolution + * with averaging from 1 to 128 samples (pow of 2) on both channels. + * Shunt voltage gain 1,2,4 or 8 is allowed. + * The bus voltage range is 60V fixed. + */ +static int isl28022_config(struct isl28022_data *data) +{ + int err; + + data->config = (ISL28022_MODE_CONT_SB << ISL28022_MODE_SHIFT) | + (ISL28022_BRNG_60 << ISL28022_BRNG_SHIFT) | + (__ffs(data->gain) << ISL28022_PG_SHIFT) | + ((ISL28022_ADC_15_1 + __ffs(data->average)) << ISL28022_SADC_SHIFT) | + ((ISL28022_ADC_15_1 + __ffs(data->average)) << ISL28022_BADC_SHIFT); + + data->calib = data->shunt ? 0x8000 / data->gain : 0; + + err = regmap_write(data->regmap, ISL28022_REG_CONFIG, data->config); + if (err < 0) + return err; + + err = regmap_write(data->regmap, ISL28022_REG_CALIB, data->calib); + if (err < 0) + return err; + + return 0; +} + +static int isl28022_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct device *hwmon_dev; + struct isl28022_data *data; + int err; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_WORD_DATA)) + return -ENODEV; + + data = devm_kzalloc(dev, sizeof(struct isl28022_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->client = client; + + err = isl28022_read_properties(dev, data); + if (err) + return err; + + data->regmap = devm_regmap_init_i2c(client, &isl28022_regmap_config); + if (IS_ERR(data->regmap)) + return PTR_ERR(data->regmap); + + err = isl28022_config(data); + if (err) + return err; + +#ifdef CONFIG_DEBUG_FS + err = isl28022_debugfs_init(data); + if (err) + return err; +#endif + + hwmon_dev = devm_hwmon_device_register_with_info(dev, "isl28022_hwmon", + data, &isl28022_chip_info, NULL); + if (IS_ERR(hwmon_dev)) + return PTR_ERR(hwmon_dev); + + dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name); + return 0; +} + +static const struct of_device_id __maybe_unused isl28022_of_match[] = { + { .compatible = "renesas,isl28022"}, + { /* LIST END */ } +}; +MODULE_DEVICE_TABLE(of, isl28022_of_match); + +static struct i2c_driver isl28022_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "isl28022", + }, + .probe_new = isl28022_probe, + .id_table = isl28022_ids, +}; + +#ifdef CONFIG_DEBUG_FS +static int __init +isl28022_init(void) +{ + int err; + + isl28022_debugfs_root = debugfs_create_dir("isl28022", NULL); + err = i2c_add_driver(&isl28022_driver); + if (!err) + return 0; + + debugfs_remove_recursive(isl28022_debugfs_root); + return err; +} + +static void __exit +isl28022_exit(void) +{ + i2c_del_driver(&isl28022_driver); + debugfs_remove_recursive(isl28022_debugfs_root); +} + +module_init(isl28022_init); +module_exit(isl28022_exit); +#else /* CONFIG_DEBUG_FS */ +module_i2c_driver(isl28022_driver); +#endif /* CONFIG_DEBUG_FS */ + +MODULE_AUTHOR("Carsten Spieß "); +MODULE_DESCRIPTION("ISL28022 driver"); +MODULE_LICENSE("GPL");