Add initial pmbus probing driver for the adm1266 Cascadable Super Sequencer with Margin Control and Fault Recording. Driver is currently using the pmbus_core, creating sysfs files under hwmon for inputs: vh1->vh4 and vp1->vp13. Signed-off-by: Alexandru Tachici <alexandru.tachici@xxxxxxxxxx> --- Documentation/hwmon/adm1266 | 34 ++++++++ drivers/hwmon/pmbus/Kconfig | 10 +++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/adm1266.c | 146 ++++++++++++++++++++++++++++++++++ 4 files changed, 191 insertions(+) create mode 100644 Documentation/hwmon/adm1266 create mode 100644 drivers/hwmon/pmbus/adm1266.c diff --git a/Documentation/hwmon/adm1266 b/Documentation/hwmon/adm1266 new file mode 100644 index 000000000000..64651b5086a7 --- /dev/null +++ b/Documentation/hwmon/adm1266 @@ -0,0 +1,34 @@ +Kernel driver adm1266 +===================== + +Supported chips: + * Analog Devices ADM1266 + Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADM1266.pdf + +Author: Alexandru Tachici <alexandru.tachici@xxxxxxxxxx> + + +Description +----------- + +This driver supports hardware monitoring for Analog Devices ADM1266 sequencer. + +ADM1266 is a sequencer that feature voltage readback from 17 channels via an +integrated 12 bit SAR ADC, accessed using a PMBus interface. + +The driver is a client driver to the core PMBus driver. Please see +Documentation/hwmon/pmbus for details on PMBus client drivers. + + +Sysfs entries +------------- + +The following attributes are supported. Limits are read-write, history reset +attributes are write-only, all other attributes are read-only. + +inX_label "voutx" +inX_input Measured voltage. +inX_min Minimum Voltage. +inX_max Maximum voltage. +inX_min_alarm Voltage low alarm. +inX_max_alarm Voltage high alarm. diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index a9ea06204767..153e64febe98 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -26,6 +26,16 @@ config SENSORS_PMBUS This driver can also be built as a module. If so, the module will be called pmbus. +config SENSORS_ADM1266 + tristate "Analog Devices ADM1266" + default n + help + If you say yes here you get hardware monitoring support for Analog + Devices ADM1266. + + This driver can also be built as a module. If so, the module will + be called adm1266. + config SENSORS_ADM1275 tristate "Analog Devices ADM1275 and compatibles" help diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 5feb45806123..ed38f6d6f845 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_PMBUS) += pmbus_core.o obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o +obj-$(CONFIG_SENSORS_ADM1266) += adm1266.o obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o obj-$(CONFIG_SENSORS_BEL_PFE) += bel-pfe.o obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c new file mode 100644 index 000000000000..3aa8262f9bd6 --- /dev/null +++ b/drivers/hwmon/pmbus/adm1266.c @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ADM1266 - Cascadable Super Sequencer with Margin + * Control and Fault Recording + * + * Copyright 2020 Analog Devices Inc. + */ + +#include <linux/bitops.h> +#include <linux/err.h> +#include <linux/fwnode.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> + +#include "pmbus.h" + +enum chips { adm1266 }; + +struct adm1266_data { + enum chips id; + struct pmbus_driver_info info; +}; + +static int adm1266_block_wr(struct i2c_client *client, u8 cmd, u8 wr_len, + u8 *data_w, u8 *data_r) +{ + union i2c_smbus_data smbus_data; + int ret; + + smbus_data.block[0] = wr_len; + memcpy(smbus_data.block + 1, data_w, wr_len); + ret = i2c_smbus_xfer(client->adapter, client->addr, + client->flags, I2C_SMBUS_READ, cmd, + I2C_SMBUS_BLOCK_PROC_CALL, &smbus_data); + if (ret < 0) + return ret; + + memcpy(data_r, &smbus_data.block[1], smbus_data.block[0]); + + return 0; +} + +static int adm1266_config(struct pmbus_driver_info *info) +{ + u32 funcs; + int i; + + info->pages = 17; + info->format[PSC_VOLTAGE_OUT] = linear; + + funcs = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; + for (i = 0; i < info->pages; i++) + info->func[i] = funcs; + + return 0; +} + +static const struct i2c_device_id adm1266_id[] = { + { "adm1266", adm1266 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, adm1266_id); + +static int adm1266_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; + u8 wr_buffer[I2C_SMBUS_BLOCK_MAX + 1]; + const struct i2c_device_id *mid; + struct adm1266_data *data; + int ret; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_BYTE_DATA + | I2C_FUNC_SMBUS_BLOCK_DATA)) + return -ENODEV; + + wr_buffer[0] = 32; + ret = adm1266_block_wr(client, PMBUS_MFR_ID, 1, wr_buffer, + block_buffer); + if (ret < 0) { + dev_err(&client->dev, "Failed to read Manufacturer ID\n"); + return ret; + } + + if (strncmp(block_buffer, "Analog Devices, Inc", 19)) { + dev_err(&client->dev, "Unsupported Manufacturer ID\n"); + return -ENODEV; + } + + wr_buffer[0] = 32; + ret = adm1266_block_wr(client, PMBUS_MFR_MODEL, 1, wr_buffer, + block_buffer); + if (ret < 0) { + dev_err(&client->dev, "Failed to read Manufacturer Model\n"); + return ret; + } + + for (mid = adm1266_id; mid->name[0]; mid++) { + if (!strncasecmp(mid->name, block_buffer, strlen(mid->name))) + break; + } + if (!mid->name[0]) { + dev_err(&client->dev, "Unsupported device\n"); + return -ENODEV; + } + + data = devm_kzalloc(&client->dev, sizeof(struct adm1266_data), + GFP_KERNEL); + if (!data) + return -ENOMEM; + data->id = mid->driver_data; + + ret = adm1266_config(&data->info); + if (ret < 0) { + dev_err(&client->dev, "Could not configure device."); + return ret; + } + + return pmbus_do_probe(client, id, &data->info); +} + +static const struct of_device_id adm1266_of_match[] = { + { .compatible = "adi,adm1266" }, + { }, +}; +MODULE_DEVICE_TABLE(of, adm1266_of_match); + +static struct i2c_driver adm1266_driver = { + .driver = { + .name = "adm1266", + .of_match_table = adm1266_of_match, + }, + .probe = adm1266_probe, + .remove = pmbus_do_remove, + .id_table = adm1266_id, +}; + +module_i2c_driver(adm1266_driver); + +MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@xxxxxxxxxx>"); +MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1266"); +MODULE_LICENSE("GPL v2"); -- 2.20.1
