From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eddie James Subject: [PATCH v2 2/3] hwmon: (pmbus): Add POWER system power supply driver Date: Thu, 10 Aug 2017 17:19:45 -0500 Message-ID: <1502403586-20549-3-git-send-email-eajames@linux.vnet.ibm.com> References: <1502403586-20549-1-git-send-email-eajames@linux.vnet.ibm.com> Return-path: In-Reply-To: <1502403586-20549-1-git-send-email-eajames-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org Cc: robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, jdelvare-IBi9RG/b67k@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-hwmon-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, joel-U3u1mxZcP9KHXe+LvDLADg@public.gmane.org, jk-mnsaURCQ41sdnm+yROfE0A@public.gmane.org, andrew-zrmu5oMJ5Fs@public.gmane.org, eajames-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, corbet-T1hC0tSOHrs@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, "Edward A. James" List-Id: devicetree@vger.kernel.org From: "Edward A. James" Add the driver to monitor POWER system power supplies with hwmon over pmbus. Signed-off-by: Edward A. James --- drivers/hwmon/pmbus/Kconfig | 10 +++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/powerps.c | 144 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 155 insertions(+) create mode 100644 drivers/hwmon/pmbus/powerps.c diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index 68d717a..8925c1a 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -125,6 +125,16 @@ config SENSORS_MAX8688 This driver can also be built as a module. If so, the module will be called max8688. +config SENSORS_POWERPS + tristate "IBM POWER System Power Supply" + default n + help + If you say yes here you get hardware monitoring support for the IBM + POWER system power supply. + + This driver can also be built as a module. If so, the module will + be called powerps. + config SENSORS_TPS40422 tristate "TI TPS40422" default n diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 75bb7ca..3303af5 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_SENSORS_MAX16064) += max16064.o obj-$(CONFIG_SENSORS_MAX20751) += max20751.o obj-$(CONFIG_SENSORS_MAX34440) += max34440.o obj-$(CONFIG_SENSORS_MAX8688) += max8688.o +obj-$(CONFIG_SENSORS_POWERPS) += powerps.o obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o obj-$(CONFIG_SENSORS_UCD9000) += ucd9000.o obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o diff --git a/drivers/hwmon/pmbus/powerps.c b/drivers/hwmon/pmbus/powerps.c new file mode 100644 index 0000000..21d28f2 --- /dev/null +++ b/drivers/hwmon/pmbus/powerps.c @@ -0,0 +1,144 @@ +/* + * Copyright 2017 IBM Corp. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include +#include +#include +#include + +#include "pmbus.h" + +/* STATUS_MFR_SPECIFIC bits */ +#define POWERPS_MFR_FAN_FAULT BIT(0) +#define POWERPS_MFR_THERMAL_FAULT BIT(1) +#define POWERPS_MFR_OV_FAULT BIT(2) +#define POWERPS_MFR_UV_FAULT BIT(3) +#define POWERPS_MFR_PS_KILL BIT(4) +#define POWERPS_MFR_OC_FAULT BIT(5) +#define POWERPS_MFR_VAUX_FAULT BIT(6) +#define POWERPS_MFR_CURRENT_SHARE_WARNING BIT(7) + +static int powerps_read_byte_data(struct i2c_client *client, int page, int reg) +{ + int rc, mfr; + + switch (reg) { + case PMBUS_STATUS_VOUT: + case PMBUS_STATUS_IOUT: + case PMBUS_STATUS_TEMPERATURE: + case PMBUS_STATUS_FAN_12: + rc = pmbus_read_byte_data(client, page, reg); + if (rc < 0) + return rc; + + mfr = pmbus_read_byte_data(client, page, + PMBUS_STATUS_MFR_SPECIFIC); + if (mfr < 0) + return rc; + + /* Add MFR_SPECIFIC bits to the standard pmbus status regs. */ + if (reg == PMBUS_STATUS_FAN_12) { + if (mfr & POWERPS_MFR_FAN_FAULT) + rc |= PB_FAN_FAN1_FAULT; + } else if (reg == PMBUS_STATUS_TEMPERATURE) { + if (mfr & POWERPS_MFR_THERMAL_FAULT) + rc |= PB_TEMP_OT_FAULT; + } else if (reg == PMBUS_STATUS_VOUT) { + if (mfr & + (POWERPS_MFR_OV_FAULT | POWERPS_MFR_VAUX_FAULT)) + rc |= PB_VOLTAGE_OV_FAULT; + if (mfr & POWERPS_MFR_UV_FAULT) + rc |= PB_VOLTAGE_UV_FAULT; + } else if (reg == PMBUS_STATUS_IOUT) { + if (mfr & POWERPS_MFR_OC_FAULT) + rc |= PB_IOUT_OC_FAULT; + if (mfr & POWERPS_MFR_CURRENT_SHARE_WARNING) + rc |= PB_CURRENT_SHARE_FAULT; + } + break; + default: + rc = -ENODATA; + break; + } + + return rc; +} + +static int powerps_read_word_data(struct i2c_client *client, int page, int reg) +{ + int rc, mfr; + + switch (reg) { + case PMBUS_STATUS_WORD: + rc = pmbus_read_word_data(client, page, reg); + if (rc < 0) + return rc; + + mfr = pmbus_read_byte_data(client, page, + PMBUS_STATUS_MFR_SPECIFIC); + if (mfr < 0) + return rc; + + if (mfr & POWERPS_MFR_PS_KILL) + rc |= PB_STATUS_OFF; + break; + default: + rc = -ENODATA; + break; + } + + return rc; +} + +static struct pmbus_driver_info powerps_info = { + .pages = 1, + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | + PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP | + PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT | + PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT | + PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12, + .read_byte_data = powerps_read_byte_data, + .read_word_data = powerps_read_word_data, + .debugfs = true, +}; + +static int powerps_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + return pmbus_do_probe(client, id, &powerps_info); +} + +static const struct i2c_device_id powerps_id[] = { + { "power_ps", 1 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, powerps_id); + +/* IBM provides many compatible power supplies; use a generic name. */ +static const struct of_device_id powerps_of_match[] = { + { .compatible = "ibm,power-ps" }, + {} +}; +MODULE_DEVICE_TABLE(of, powerps_of_match); + +static struct i2c_driver powerps_driver = { + .driver = { + .name = "powerps", + .of_match_table = powerps_of_match, + }, + .probe = powerps_probe, + .remove = pmbus_do_remove, + .id_table = powerps_id, +}; + +module_i2c_driver(powerps_driver); + +MODULE_AUTHOR("Eddie James"); +MODULE_DESCRIPTION("PMBus driver for POWER system power supplies"); +MODULE_LICENSE("GPL"); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html