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[PATCH 0/4] drivers/hwmon/pmbus: Add IBM power supply hwmon driver

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  [PATCH 0/4] drivers/hwmon/pmbus: Add IBM power supply hwmon driver Eddie James <eajames@linux.vnet.ibm.com> - 2017-08-02 23:20 +0200
    [PATCH 1/4] drivers/hwmon/pmbus: Add IBM power supply hwmon driver Eddie James <eajames@linux.vnet.ibm.com> - 2017-08-02 23:20 +0200
      Re: [PATCH 1/4] drivers/hwmon/pmbus: Add IBM power supply hwmon  driver Guenter Roeck <linux@roeck-us.net> - 2017-08-10 16:50 +0200
      Re: [PATCH 1/4] drivers/hwmon/pmbus: Add IBM power supply hwmon  driver Guenter Roeck <linux@roeck-us.net> - 2017-08-10 17:10 +0200
        Re: [PATCH 1/4] drivers/hwmon/pmbus: Add IBM power supply hwmon  driver Eddie James <eajames@linux.vnet.ibm.com> - 2017-08-10 17:40 +0200
    [PATCH 2/4] drivers/hwmon/pmbus: ibmps: Add non-hwmon attributes Eddie James <eajames@linux.vnet.ibm.com> - 2017-08-02 23:20 +0200
      Re: [PATCH 2/4] drivers/hwmon/pmbus: ibmps: Add non-hwmon attributes Guenter Roeck <linux@roeck-us.net> - 2017-08-10 17:00 +0200
    [PATCH 4/4] Documentation: ABI: Add IBM power supply sysfs documentation Eddie James <eajames@linux.vnet.ibm.com> - 2017-08-02 23:20 +0200
      Re: [PATCH 4/4] Documentation: ABI: Add IBM power supply sysfs  documentation Guenter Roeck <linux@roeck-us.net> - 2017-08-10 17:00 +0200
    [PATCH 3/4] Documentation: hwmon: Add IBM power supply documentation Eddie James <eajames@linux.vnet.ibm.com> - 2017-08-02 23:20 +0200
      Re: [PATCH 3/4] Documentation: hwmon: Add IBM power supply  documentation Guenter Roeck <linux@roeck-us.net> - 2017-08-10 17:00 +0200

#1702489 — [PATCH 0/4] drivers/hwmon/pmbus: Add IBM power supply hwmon driver

From: "Edward A. James" <eajames@us.ibm.com>

This series adds a hwmon pmbus driver for an IBM power supply. The core
monitoring functionality is provided by pmbus. The driver also exports some
sysfs entries for raw status register access and the ability to clear faults.

Edward A. James (4):
  drivers/hwmon/pmbus: Add IBM power supply hwmon driver
  drivers/hwmon/pmbus: ibmps: Add non-hwmon attributes
  Documentation: hwmon: Add IBM power supply documentation
  Documentation: ABI: Add IBM power supply sysfs documentation

 Documentation/ABI/testing/sysfs-driver-ibmps |  49 ++++++
 Documentation/hwmon/ibmps                    |  53 ++++++
 drivers/hwmon/pmbus/Kconfig                  |  10 ++
 drivers/hwmon/pmbus/Makefile                 |   1 +
 drivers/hwmon/pmbus/ibmps.c                  | 242 +++++++++++++++++++++++++++
 5 files changed, 355 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-driver-ibmps
 create mode 100644 Documentation/hwmon/ibmps
 create mode 100644 drivers/hwmon/pmbus/ibmps.c

-- 
1.8.3.1

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#1702491 — [PATCH 1/4] drivers/hwmon/pmbus: Add IBM power supply hwmon driver

From: "Edward A. James" <eajames@us.ibm.com>

Add the driver to monitor power supplies with hwmon over pmbus.

Signed-off-by: Edward A. James <eajames@us.ibm.com>
---
 drivers/hwmon/pmbus/Kconfig  |  10 +++
 drivers/hwmon/pmbus/Makefile |   1 +
 drivers/hwmon/pmbus/ibmps.c  | 164 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 175 insertions(+)
 create mode 100644 drivers/hwmon/pmbus/ibmps.c

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 68d717a..4eba657 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -37,6 +37,16 @@ config SENSORS_ADM1275
 	  This driver can also be built as a module. If so, the module will
 	  be called adm1275.
 
+config SENSORS_IBMPS
+	tristate "IBM Power Supply"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for IBM
+	  power supply.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called ibmps.
+
 config SENSORS_IR35221
 	tristate "Infineon IR35221"
 	default n
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 75bb7ca..e37b715 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-$(CONFIG_SENSORS_ADM1275)	+= adm1275.o
+obj-$(CONFIG_SENSORS_IBMPS)	+= ibmps.o
 obj-$(CONFIG_SENSORS_IR35221)	+= ir35221.o
 obj-$(CONFIG_SENSORS_LM25066)	+= lm25066.o
 obj-$(CONFIG_SENSORS_LTC2978)	+= ltc2978.o
diff --git a/drivers/hwmon/pmbus/ibmps.c b/drivers/hwmon/pmbus/ibmps.c
new file mode 100644
index 0000000..1928dd9
--- /dev/null
+++ b/drivers/hwmon/pmbus/ibmps.c
@@ -0,0 +1,164 @@
+/*
+ * 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 <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+
+#include "pmbus.h"
+
+#define IBMPS_MFR_FAN_FAULT			BIT(0)
+#define IBMPS_MFR_THERMAL_FAULT			BIT(1)
+#define IBMPS_MFR_OV_FAULT			BIT(2)
+#define IBMPS_MFR_UV_FAULT			BIT(3)
+#define IBMPS_MFR_PS_KILL			BIT(4)
+#define IBMPS_MFR_OC_FAULT			BIT(5)
+#define IBMPS_MFR_VAUX_FAULT			BIT(6)
+#define IBMPS_MFR_CURRENT_SHARE_WARNING		BIT(7)
+
+static int ibmps_read_word_data(struct i2c_client *client, int page, int reg);
+
+static int ibmps_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+	int rc, mfr;
+
+	switch (reg) {
+	case PMBUS_STATUS_BYTE:
+	case PMBUS_STATUS_WORD:
+		rc = ibmps_read_word_data(client, page, PMBUS_STATUS_WORD);
+		break;
+	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;
+
+		if (reg == PMBUS_STATUS_FAN_12) {
+			if (mfr & IBMPS_MFR_FAN_FAULT)
+				rc |= PB_FAN_FAN1_FAULT;
+		} else if (reg == PMBUS_STATUS_TEMPERATURE) {
+			if (mfr & IBMPS_MFR_THERMAL_FAULT)
+				rc |= PB_TEMP_OT_FAULT;
+		} else if (reg == PMBUS_STATUS_VOUT) {
+			if (mfr & (IBMPS_MFR_OV_FAULT | IBMPS_MFR_VAUX_FAULT))
+				rc |= PB_VOLTAGE_OV_FAULT;
+			if (mfr & IBMPS_MFR_UV_FAULT)
+				rc |= PB_VOLTAGE_UV_FAULT;
+		} else if (reg == PMBUS_STATUS_IOUT) {
+			if (mfr & IBMPS_MFR_OC_FAULT)
+				rc |= PB_IOUT_OC_FAULT;
+			if (mfr & IBMPS_MFR_CURRENT_SHARE_WARNING)
+				rc |= PB_CURRENT_SHARE_FAULT;
+		}
+		break;
+	default:
+		if (reg >= PMBUS_VIRT_BASE)
+			return -ENXIO;
+
+		rc = pmbus_read_byte_data(client, page, reg);
+		break;
+	}
+
+	return rc;
+}
+
+static int ibmps_read_word_data(struct i2c_client *client, int page, int reg)
+{
+	int rc, mfr;
+
+	switch (reg) {
+	case PMBUS_STATUS_BYTE:
+	case PMBUS_STATUS_WORD:
+		rc = pmbus_read_word_data(client, page, PMBUS_STATUS_WORD);
+		if (rc < 0)
+			return rc;
+
+		mfr = pmbus_read_byte_data(client, page,
+					   PMBUS_STATUS_MFR_SPECIFIC);
+		if (mfr < 0)
+			return rc;
+
+		if (mfr & IBMPS_MFR_PS_KILL)
+			rc |= PB_STATUS_OFF;
+
+		if (mfr)
+			rc |= PB_STATUS_WORD_MFR;
+		break;
+	default:
+		if (reg >= PMBUS_VIRT_BASE)
+			return -ENXIO;
+
+		rc = pmbus_read_word_data(client, page, reg);
+		if (rc < 0)
+			rc = ibmps_read_byte_data(client, page, reg);
+		break;
+	}
+
+	return rc;
+}
+
+static struct pmbus_driver_info ibmps_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 = ibmps_read_byte_data,
+	.read_word_data = ibmps_read_word_data,
+};
+
+static int ibmps_probe(struct i2c_client *client,
+		       const struct i2c_device_id *id)
+{
+	return pmbus_do_probe(client, id, &ibmps_info);
+}
+
+static int ibmps_remove(struct i2c_client *client)
+{
+	return pmbus_do_remove(client);
+}
+
+enum chips { witherspoon };
+
+static const struct i2c_device_id ibmps_id[] = {
+	{ "witherspoon", witherspoon },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ibmps_id);
+
+static const struct of_device_id ibmps_of_match[] = {
+	{ .compatible = "ibm,ibmps" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, p8_i2c_occ_of_match);
+
+static struct i2c_driver ibmps_driver = {
+	.driver = {
+		.name = "ibmps",
+		.of_match_table = ibmps_of_match,
+	},
+	.probe = ibmps_probe,
+	.remove = ibmps_remove,
+	.id_table = ibmps_id,
+};
+
+module_i2c_driver(ibmps_driver);
+
+MODULE_AUTHOR("Eddie James");
+MODULE_DESCRIPTION("PMBus driver for IBM power supply");
+MODULE_LICENSE("GPL");
-- 
1.8.3.1

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#1708691 — Re: [PATCH 1/4] drivers/hwmon/pmbus: Add IBM power supply hwmon driver

On Wed, Aug 02, 2017 at 04:17:10PM -0500, Eddie James wrote:
> From: "Edward A. James" <eajames@us.ibm.com>
> 
> Add the driver to monitor power supplies with hwmon over pmbus.
> 
> Signed-off-by: Edward A. James <eajames@us.ibm.com>
> ---
>  drivers/hwmon/pmbus/Kconfig  |  10 +++
>  drivers/hwmon/pmbus/Makefile |   1 +
>  drivers/hwmon/pmbus/ibmps.c  | 164 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 175 insertions(+)
>  create mode 100644 drivers/hwmon/pmbus/ibmps.c
> 
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 68d717a..4eba657 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -37,6 +37,16 @@ config SENSORS_ADM1275
>  	  This driver can also be built as a module. If so, the module will
>  	  be called adm1275.
>  
> +config SENSORS_IBMPS
> +	tristate "IBM Power Supply"

What if IBM ever produces another power supply ?
I think this should be more specific. Similar, ibmps/IBMPS is way
too generic.

> +	default n
> +	help
> +	  If you say yes here you get hardware monitoring support for IBM
> +	  power supply.
> +
> +	  This driver can also be built as a module. If so, the module will
> +	  be called ibmps.
> +
>  config SENSORS_IR35221
>  	tristate "Infineon IR35221"
>  	default n
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index 75bb7ca..e37b715 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-$(CONFIG_SENSORS_ADM1275)	+= adm1275.o
> +obj-$(CONFIG_SENSORS_IBMPS)	+= ibmps.o
>  obj-$(CONFIG_SENSORS_IR35221)	+= ir35221.o
>  obj-$(CONFIG_SENSORS_LM25066)	+= lm25066.o
>  obj-$(CONFIG_SENSORS_LTC2978)	+= ltc2978.o
> diff --git a/drivers/hwmon/pmbus/ibmps.c b/drivers/hwmon/pmbus/ibmps.c
> new file mode 100644
> index 0000000..1928dd9
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/ibmps.c
> @@ -0,0 +1,164 @@
> +/*
> + * 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 <linux/device.h>
> +#include <linux/i2c.h>
> +#include <linux/jiffies.h>
> +#include <linux/module.h>
> +
> +#include "pmbus.h"
> +
> +#define IBMPS_MFR_FAN_FAULT			BIT(0)
> +#define IBMPS_MFR_THERMAL_FAULT			BIT(1)
> +#define IBMPS_MFR_OV_FAULT			BIT(2)
> +#define IBMPS_MFR_UV_FAULT			BIT(3)
> +#define IBMPS_MFR_PS_KILL			BIT(4)
> +#define IBMPS_MFR_OC_FAULT			BIT(5)
> +#define IBMPS_MFR_VAUX_FAULT			BIT(6)
> +#define IBMPS_MFR_CURRENT_SHARE_WARNING		BIT(7)
> +
> +static int ibmps_read_word_data(struct i2c_client *client, int page, int reg);
> +
I don't see why this would require a forward declaration.
Why not just move the function ?

> +static int ibmps_read_byte_data(struct i2c_client *client, int page, int reg)
> +{
> +	int rc, mfr;
> +
> +	switch (reg) {
> +	case PMBUS_STATUS_BYTE:

Is the byte part still needed with the upcoming core changes ?

> +	case PMBUS_STATUS_WORD:
> +		rc = ibmps_read_word_data(client, page, PMBUS_STATUS_WORD);
> +		break;
> +	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;
> +
> +		if (reg == PMBUS_STATUS_FAN_12) {
> +			if (mfr & IBMPS_MFR_FAN_FAULT)
> +				rc |= PB_FAN_FAN1_FAULT;
> +		} else if (reg == PMBUS_STATUS_TEMPERATURE) {
> +			if (mfr & IBMPS_MFR_THERMAL_FAULT)
> +				rc |= PB_TEMP_OT_FAULT;
> +		} else if (reg == PMBUS_STATUS_VOUT) {
> +			if (mfr & (IBMPS_MFR_OV_FAULT | IBMPS_MFR_VAUX_FAULT))
> +				rc |= PB_VOLTAGE_OV_FAULT;
> +			if (mfr & IBMPS_MFR_UV_FAULT)
> +				rc |= PB_VOLTAGE_UV_FAULT;
> +		} else if (reg == PMBUS_STATUS_IOUT) {
> +			if (mfr & IBMPS_MFR_OC_FAULT)
> +				rc |= PB_IOUT_OC_FAULT;
> +			if (mfr & IBMPS_MFR_CURRENT_SHARE_WARNING)
> +				rc |= PB_CURRENT_SHARE_FAULT;

Is changing a warning to a fault a good idea ?

> +		}
> +		break;
> +	default:
> +		if (reg >= PMBUS_VIRT_BASE)
> +			return -ENXIO;
> +
> +		rc = pmbus_read_byte_data(client, page, reg);
> +		break;

The idea here is to return -ENODATA to let the core handle it.
Please see similar drivers.

> +	}
> +
> +	return rc;
> +}
> +
> +static int ibmps_read_word_data(struct i2c_client *client, int page, int reg)
> +{
> +	int rc, mfr;
> +
> +	switch (reg) {
> +	case PMBUS_STATUS_BYTE:
> +	case PMBUS_STATUS_WORD:
> +		rc = pmbus_read_word_data(client, page, PMBUS_STATUS_WORD);
> +		if (rc < 0)
> +			return rc;
> +
> +		mfr = pmbus_read_byte_data(client, page,
> +					   PMBUS_STATUS_MFR_SPECIFIC);
> +		if (mfr < 0)
> +			return rc;
> +
> +		if (mfr & IBMPS_MFR_PS_KILL)
> +			rc |= PB_STATUS_OFF;
> +
> +		if (mfr)
> +			rc |= PB_STATUS_WORD_MFR;
> +		break;
> +	default:
> +		if (reg >= PMBUS_VIRT_BASE)
> +			return -ENXIO;

-ENODATA

> +
> +		rc = pmbus_read_word_data(client, page, reg);
> +		if (rc < 0)
> +			rc = ibmps_read_byte_data(client, page, reg);

I am a bit at loss here. Why ?

> +		break;
> +	}
> +
> +	return rc;
> +}
> +
> +static struct pmbus_driver_info ibmps_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 = ibmps_read_byte_data,
> +	.read_word_data = ibmps_read_word_data,
> +};
> +
> +static int ibmps_probe(struct i2c_client *client,
> +		       const struct i2c_device_id *id)
> +{
> +	return pmbus_do_probe(client, id, &ibmps_info);
> +}
> +
> +static int ibmps_remove(struct i2c_client *client)
> +{
> +	return pmbus_do_remove(client);
> +}
> +
> +enum chips { witherspoon };
> +
> +static const struct i2c_device_id ibmps_id[] = {
> +	{ "witherspoon", witherspoon },

This is confusing. ibmps everywhere but witherspoon here ?

> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, ibmps_id);
> +
> +static const struct of_device_id ibmps_of_match[] = {
> +	{ .compatible = "ibm,ibmps" },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, p8_i2c_occ_of_match);
> +
> +static struct i2c_driver ibmps_driver = {
> +	.driver = {
> +		.name = "ibmps",
> +		.of_match_table = ibmps_of_match,
> +	},
> +	.probe = ibmps_probe,
> +	.remove = ibmps_remove,
> +	.id_table = ibmps_id,
> +};
> +
> +module_i2c_driver(ibmps_driver);
> +
> +MODULE_AUTHOR("Eddie James");
> +MODULE_DESCRIPTION("PMBus driver for IBM power supply");
> +MODULE_LICENSE("GPL");
> -- 
> 1.8.3.1
> 
> --
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#1708712 — Re: [PATCH 1/4] drivers/hwmon/pmbus: Add IBM power supply hwmon driver

On Wed, Aug 02, 2017 at 04:17:10PM -0500, Eddie James wrote:
> From: "Edward A. James" <eajames@us.ibm.com>
> 
> Add the driver to monitor power supplies with hwmon over pmbus.
> 
> Signed-off-by: Edward A. James <eajames@us.ibm.com>
> ---
>  drivers/hwmon/pmbus/Kconfig  |  10 +++
>  drivers/hwmon/pmbus/Makefile |   1 +
>  drivers/hwmon/pmbus/ibmps.c  | 164 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 175 insertions(+)
>  create mode 100644 drivers/hwmon/pmbus/ibmps.c
> 
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 68d717a..4eba657 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -37,6 +37,16 @@ config SENSORS_ADM1275
>  	  This driver can also be built as a module. If so, the module will
>  	  be called adm1275.
>  
> +config SENSORS_IBMPS
> +	tristate "IBM Power Supply"
> +	default n
> +	help
> +	  If you say yes here you get hardware monitoring support for IBM
> +	  power supply.
> +
> +	  This driver can also be built as a module. If so, the module will
> +	  be called ibmps.
> +
>  config SENSORS_IR35221
>  	tristate "Infineon IR35221"
>  	default n
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index 75bb7ca..e37b715 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-$(CONFIG_SENSORS_ADM1275)	+= adm1275.o
> +obj-$(CONFIG_SENSORS_IBMPS)	+= ibmps.o
>  obj-$(CONFIG_SENSORS_IR35221)	+= ir35221.o
>  obj-$(CONFIG_SENSORS_LM25066)	+= lm25066.o
>  obj-$(CONFIG_SENSORS_LTC2978)	+= ltc2978.o
> diff --git a/drivers/hwmon/pmbus/ibmps.c b/drivers/hwmon/pmbus/ibmps.c
> new file mode 100644
> index 0000000..1928dd9
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/ibmps.c
> @@ -0,0 +1,164 @@
> +/*
> + * 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 <linux/device.h>
> +#include <linux/i2c.h>
> +#include <linux/jiffies.h>
> +#include <linux/module.h>
> +
> +#include "pmbus.h"
> +
> +#define IBMPS_MFR_FAN_FAULT			BIT(0)
> +#define IBMPS_MFR_THERMAL_FAULT			BIT(1)
> +#define IBMPS_MFR_OV_FAULT			BIT(2)
> +#define IBMPS_MFR_UV_FAULT			BIT(3)
> +#define IBMPS_MFR_PS_KILL			BIT(4)
> +#define IBMPS_MFR_OC_FAULT			BIT(5)
> +#define IBMPS_MFR_VAUX_FAULT			BIT(6)
> +#define IBMPS_MFR_CURRENT_SHARE_WARNING		BIT(7)
> +
> +static int ibmps_read_word_data(struct i2c_client *client, int page, int reg);
> +
> +static int ibmps_read_byte_data(struct i2c_client *client, int page, int reg)
> +{
> +	int rc, mfr;
> +
> +	switch (reg) {
> +	case PMBUS_STATUS_BYTE:
> +	case PMBUS_STATUS_WORD:
> +		rc = ibmps_read_word_data(client, page, PMBUS_STATUS_WORD);
> +		break;
> +	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;
> +
> +		if (reg == PMBUS_STATUS_FAN_12) {
> +			if (mfr & IBMPS_MFR_FAN_FAULT)
> +				rc |= PB_FAN_FAN1_FAULT;
> +		} else if (reg == PMBUS_STATUS_TEMPERATURE) {
> +			if (mfr & IBMPS_MFR_THERMAL_FAULT)
> +				rc |= PB_TEMP_OT_FAULT;
> +		} else if (reg == PMBUS_STATUS_VOUT) {
> +			if (mfr & (IBMPS_MFR_OV_FAULT | IBMPS_MFR_VAUX_FAULT))
> +				rc |= PB_VOLTAGE_OV_FAULT;
> +			if (mfr & IBMPS_MFR_UV_FAULT)
> +				rc |= PB_VOLTAGE_UV_FAULT;
> +		} else if (reg == PMBUS_STATUS_IOUT) {
> +			if (mfr & IBMPS_MFR_OC_FAULT)
> +				rc |= PB_IOUT_OC_FAULT;
> +			if (mfr & IBMPS_MFR_CURRENT_SHARE_WARNING)
> +				rc |= PB_CURRENT_SHARE_FAULT;
> +		}
> +		break;
> +	default:
> +		if (reg >= PMBUS_VIRT_BASE)
> +			return -ENXIO;
> +
> +		rc = pmbus_read_byte_data(client, page, reg);
> +		break;
> +	}
> +
> +	return rc;
> +}
> +
> +static int ibmps_read_word_data(struct i2c_client *client, int page, int reg)
> +{
> +	int rc, mfr;
> +
> +	switch (reg) {
> +	case PMBUS_STATUS_BYTE:
> +	case PMBUS_STATUS_WORD:
> +		rc = pmbus_read_word_data(client, page, PMBUS_STATUS_WORD);
> +		if (rc < 0)
> +			return rc;
> +
> +		mfr = pmbus_read_byte_data(client, page,
> +					   PMBUS_STATUS_MFR_SPECIFIC);
> +		if (mfr < 0)
> +			return rc;
> +
> +		if (mfr & IBMPS_MFR_PS_KILL)
> +			rc |= PB_STATUS_OFF;
> +
> +		if (mfr)
> +			rc |= PB_STATUS_WORD_MFR;
> +		break;
> +	default:
> +		if (reg >= PMBUS_VIRT_BASE)
> +			return -ENXIO;
> +
> +		rc = pmbus_read_word_data(client, page, reg);
> +		if (rc < 0)
> +			rc = ibmps_read_byte_data(client, page, reg);
> +		break;
> +	}
> +
> +	return rc;
> +}
> +
> +static struct pmbus_driver_info ibmps_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 = ibmps_read_byte_data,
> +	.read_word_data = ibmps_read_word_data,
> +};
> +
> +static int ibmps_probe(struct i2c_client *client,
> +		       const struct i2c_device_id *id)
> +{
> +	return pmbus_do_probe(client, id, &ibmps_info);
> +}
> +
> +static int ibmps_remove(struct i2c_client *client)
> +{
> +	return pmbus_do_remove(client);
> +}
> +
> +enum chips { witherspoon };
> +
> +static const struct i2c_device_id ibmps_id[] = {
> +	{ "witherspoon", witherspoon },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, ibmps_id);
> +
> +static const struct of_device_id ibmps_of_match[] = {
> +	{ .compatible = "ibm,ibmps" },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, p8_i2c_occ_of_match);

Ah yes, as 0day points out, this won't compile.
Hmmm ..... makes me wonder if and how you tested this.
Can you provide output from the "sensors" command ?

Guenter

> +
> +static struct i2c_driver ibmps_driver = {
> +	.driver = {
> +		.name = "ibmps",
> +		.of_match_table = ibmps_of_match,
> +	},
> +	.probe = ibmps_probe,
> +	.remove = ibmps_remove,
> +	.id_table = ibmps_id,
> +};
> +
> +module_i2c_driver(ibmps_driver);
> +
> +MODULE_AUTHOR("Eddie James");
> +MODULE_DESCRIPTION("PMBus driver for IBM power supply");
> +MODULE_LICENSE("GPL");
> -- 
> 1.8.3.1
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

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#1708741 — Re: [PATCH 1/4] drivers/hwmon/pmbus: Add IBM power supply hwmon driver

On 08/10/2017 10:00 AM, Guenter Roeck wrote:
> On Wed, Aug 02, 2017 at 04:17:10PM -0500, Eddie James wrote:
>> From: "Edward A. James" <eajames@us.ibm.com>
>>
>> Add the driver to monitor power supplies with hwmon over pmbus.
>>
>> Signed-off-by: Edward A. James <eajames@us.ibm.com>
>> ---
>>   drivers/hwmon/pmbus/Kconfig  |  10 +++
>>   drivers/hwmon/pmbus/Makefile |   1 +
>>   drivers/hwmon/pmbus/ibmps.c  | 164 +++++++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 175 insertions(+)
>>   create mode 100644 drivers/hwmon/pmbus/ibmps.c
>>
>> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
>> index 68d717a..4eba657 100644
>> --- a/drivers/hwmon/pmbus/Kconfig
>> +++ b/drivers/hwmon/pmbus/Kconfig
>> @@ -37,6 +37,16 @@ config SENSORS_ADM1275
>>   	  This driver can also be built as a module. If so, the module will
>>   	  be called adm1275.
>>   
>> +config SENSORS_IBMPS
>> +	tristate "IBM Power Supply"
>> +	default n
>> +	help
>> +	  If you say yes here you get hardware monitoring support for IBM
>> +	  power supply.
>> +
>> +	  This driver can also be built as a module. If so, the module will
>> +	  be called ibmps.
>> +
>>   config SENSORS_IR35221
>>   	tristate "Infineon IR35221"
>>   	default n
>> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
>> index 75bb7ca..e37b715 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-$(CONFIG_SENSORS_ADM1275)	+= adm1275.o
>> +obj-$(CONFIG_SENSORS_IBMPS)	+= ibmps.o
>>   obj-$(CONFIG_SENSORS_IR35221)	+= ir35221.o
>>   obj-$(CONFIG_SENSORS_LM25066)	+= lm25066.o
>>   obj-$(CONFIG_SENSORS_LTC2978)	+= ltc2978.o
>> diff --git a/drivers/hwmon/pmbus/ibmps.c b/drivers/hwmon/pmbus/ibmps.c
>> new file mode 100644
>> index 0000000..1928dd9
>> --- /dev/null
>> +++ b/drivers/hwmon/pmbus/ibmps.c
>> @@ -0,0 +1,164 @@
>> +/*
>> + * 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 <linux/device.h>
>> +#include <linux/i2c.h>
>> +#include <linux/jiffies.h>
>> +#include <linux/module.h>
>> +
>> +#include "pmbus.h"
>> +
>> +#define IBMPS_MFR_FAN_FAULT			BIT(0)
>> +#define IBMPS_MFR_THERMAL_FAULT			BIT(1)
>> +#define IBMPS_MFR_OV_FAULT			BIT(2)
>> +#define IBMPS_MFR_UV_FAULT			BIT(3)
>> +#define IBMPS_MFR_PS_KILL			BIT(4)
>> +#define IBMPS_MFR_OC_FAULT			BIT(5)
>> +#define IBMPS_MFR_VAUX_FAULT			BIT(6)
>> +#define IBMPS_MFR_CURRENT_SHARE_WARNING		BIT(7)
>> +
>> +static int ibmps_read_word_data(struct i2c_client *client, int page, int reg);
>> +
>> +static int ibmps_read_byte_data(struct i2c_client *client, int page, int reg)
>> +{
>> +	int rc, mfr;
>> +
>> +	switch (reg) {
>> +	case PMBUS_STATUS_BYTE:
>> +	case PMBUS_STATUS_WORD:
>> +		rc = ibmps_read_word_data(client, page, PMBUS_STATUS_WORD);
>> +		break;
>> +	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;
>> +
>> +		if (reg == PMBUS_STATUS_FAN_12) {
>> +			if (mfr & IBMPS_MFR_FAN_FAULT)
>> +				rc |= PB_FAN_FAN1_FAULT;
>> +		} else if (reg == PMBUS_STATUS_TEMPERATURE) {
>> +			if (mfr & IBMPS_MFR_THERMAL_FAULT)
>> +				rc |= PB_TEMP_OT_FAULT;
>> +		} else if (reg == PMBUS_STATUS_VOUT) {
>> +			if (mfr & (IBMPS_MFR_OV_FAULT | IBMPS_MFR_VAUX_FAULT))
>> +				rc |= PB_VOLTAGE_OV_FAULT;
>> +			if (mfr & IBMPS_MFR_UV_FAULT)
>> +				rc |= PB_VOLTAGE_UV_FAULT;
>> +		} else if (reg == PMBUS_STATUS_IOUT) {
>> +			if (mfr & IBMPS_MFR_OC_FAULT)
>> +				rc |= PB_IOUT_OC_FAULT;
>> +			if (mfr & IBMPS_MFR_CURRENT_SHARE_WARNING)
>> +				rc |= PB_CURRENT_SHARE_FAULT;
>> +		}
>> +		break;
>> +	default:
>> +		if (reg >= PMBUS_VIRT_BASE)
>> +			return -ENXIO;
>> +
>> +		rc = pmbus_read_byte_data(client, page, reg);
>> +		break;
>> +	}
>> +
>> +	return rc;
>> +}
>> +
>> +static int ibmps_read_word_data(struct i2c_client *client, int page, int reg)
>> +{
>> +	int rc, mfr;
>> +
>> +	switch (reg) {
>> +	case PMBUS_STATUS_BYTE:
>> +	case PMBUS_STATUS_WORD:
>> +		rc = pmbus_read_word_data(client, page, PMBUS_STATUS_WORD);
>> +		if (rc < 0)
>> +			return rc;
>> +
>> +		mfr = pmbus_read_byte_data(client, page,
>> +					   PMBUS_STATUS_MFR_SPECIFIC);
>> +		if (mfr < 0)
>> +			return rc;
>> +
>> +		if (mfr & IBMPS_MFR_PS_KILL)
>> +			rc |= PB_STATUS_OFF;
>> +
>> +		if (mfr)
>> +			rc |= PB_STATUS_WORD_MFR;
>> +		break;
>> +	default:
>> +		if (reg >= PMBUS_VIRT_BASE)
>> +			return -ENXIO;
>> +
>> +		rc = pmbus_read_word_data(client, page, reg);
>> +		if (rc < 0)
>> +			rc = ibmps_read_byte_data(client, page, reg);
>> +		break;
>> +	}
>> +
>> +	return rc;
>> +}
>> +
>> +static struct pmbus_driver_info ibmps_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 = ibmps_read_byte_data,
>> +	.read_word_data = ibmps_read_word_data,
>> +};
>> +
>> +static int ibmps_probe(struct i2c_client *client,
>> +		       const struct i2c_device_id *id)
>> +{
>> +	return pmbus_do_probe(client, id, &ibmps_info);
>> +}
>> +
>> +static int ibmps_remove(struct i2c_client *client)
>> +{
>> +	return pmbus_do_remove(client);
>> +}
>> +
>> +enum chips { witherspoon };
>> +
>> +static const struct i2c_device_id ibmps_id[] = {
>> +	{ "witherspoon", witherspoon },
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(i2c, ibmps_id);
>> +
>> +static const struct of_device_id ibmps_of_match[] = {
>> +	{ .compatible = "ibm,ibmps" },
>> +	{}
>> +};
>> +MODULE_DEVICE_TABLE(of, p8_i2c_occ_of_match);
> Ah yes, as 0day points out, this won't compile.
> Hmmm ..... makes me wonder if and how you tested this.
> Can you provide output from the "sensors" command ?
>
> Guenter

Just a copy/paste goof on my part. It compiled in my development tree, 
as that symbol is defined elsewhere... I'll fix this in the next patch set.

This has been tested with the real power supply. I'm not sure what the 
sensors command is; I don't think I can use it on our test machines. Here:

# ls /sys/bus/i2c/devices/3-0068/hwmon/hwmon10
curr1_alarm   fan1_fault    fan2_input    in2_input power1_input  
temp2_alarm
curr1_input   fan1_input    in1_alarm     in2_label power1_label  
temp2_input
curr1_label   fan1_target   in1_input     name subsystem     temp3_alarm
device        fan2_alarm    in1_label     power temp1_alarm   temp3_input
fan1_alarm    fan2_fault    in2_alarm     power1_alarm temp1_input   uevent

# cat /sys/bus/i2c/devices/3-0068/hwmon/hwmon10/*

0
6125
iout1
cat: read error: Is a directory

0

0
3200
cat: read error: No such device or address

0

0
1568

0
204000
vin

0
12250
vout1
witherspoon_ps
cat: read error: Is a directory

0
120000000
pin
cat: read error: Is a directory

0
31000

0
34000

0
23000

Thanks,
Eddie

>
>> +
>> +static struct i2c_driver ibmps_driver = {
>> +	.driver = {
>> +		.name = "ibmps",
>> +		.of_match_table = ibmps_of_match,
>> +	},
>> +	.probe = ibmps_probe,
>> +	.remove = ibmps_remove,
>> +	.id_table = ibmps_id,
>> +};
>> +
>> +module_i2c_driver(ibmps_driver);
>> +
>> +MODULE_AUTHOR("Eddie James");
>> +MODULE_DESCRIPTION("PMBus driver for IBM power supply");
>> +MODULE_LICENSE("GPL");
>> -- 
>> 1.8.3.1
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html

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#1702492 — [PATCH 2/4] drivers/hwmon/pmbus: ibmps: Add non-hwmon attributes

From: "Edward A. James" <eajames@us.ibm.com>

Add sysfs entries to dump out PS registers and clear faults.

Signed-off-by: Edward A. James <eajames@us.ibm.com>
---
 drivers/hwmon/pmbus/ibmps.c | 78 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/drivers/hwmon/pmbus/ibmps.c b/drivers/hwmon/pmbus/ibmps.c
index 1928dd9..f55d2bf 100644
--- a/drivers/hwmon/pmbus/ibmps.c
+++ b/drivers/hwmon/pmbus/ibmps.c
@@ -9,8 +9,10 @@
 
 #include <linux/device.h>
 #include <linux/i2c.h>
+#include <linux/hwmon-sysfs.h>
 #include <linux/jiffies.h>
 #include <linux/module.h>
+#include <linux/sysfs.h>
 
 #include "pmbus.h"
 
@@ -122,14 +124,90 @@ static int ibmps_read_word_data(struct i2c_client *client, int page, int reg)
 	.read_word_data = ibmps_read_word_data,
 };
 
+static ssize_t ibmps_clear_faults(struct device *dev,
+				  struct device_attribute *dev_attr,
+				  const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	pmbus_clear_faults(client);
+
+	return count;
+}
+static DEVICE_ATTR(clear_faults, 0200, NULL, ibmps_clear_faults);
+
+static ssize_t ibmps_show_status_word(struct device *dev,
+				      struct device_attribute *dev_attr,
+				      char *buf)
+{
+	int rc;
+	struct i2c_client *client = to_i2c_client(dev);
+
+	rc = pmbus_read_word_data(client, 0, PMBUS_STATUS_WORD);
+	if (rc < 0)
+		return rc;
+
+	return snprintf(buf, PAGE_SIZE - 1, "%04x\n", rc);
+}
+static DEVICE_ATTR(status_word, 0444, ibmps_show_status_word, NULL);
+
+static ssize_t ibmps_show_status_byte(struct device *dev,
+				      struct device_attribute *dev_attr,
+				      char *buf)
+{
+	int rc;
+	struct i2c_client *client = to_i2c_client(dev);
+	struct sensor_device_attribute *sattr = to_sensor_dev_attr(dev_attr);
+
+	rc = pmbus_read_byte_data(client, 0, PMBUS_STATUS_VOUT + sattr->index);
+	if (rc < 0)
+		return rc;
+
+	return snprintf(buf, PAGE_SIZE - 1, "%02x\n", rc);
+}
+
+static SENSOR_DEVICE_ATTR(status_vout, 0444, ibmps_show_status_byte, NULL, 0);
+static SENSOR_DEVICE_ATTR(status_iout, 0444, ibmps_show_status_byte, NULL, 1);
+static SENSOR_DEVICE_ATTR(status_input, 0444, ibmps_show_status_byte, NULL, 2);
+static SENSOR_DEVICE_ATTR(status_temp, 0444, ibmps_show_status_byte, NULL, 3);
+static SENSOR_DEVICE_ATTR(status_cml, 0444, ibmps_show_status_byte, NULL, 4);
+static SENSOR_DEVICE_ATTR(status_other, 0444, ibmps_show_status_byte, NULL, 5);
+static SENSOR_DEVICE_ATTR(status_mfr, 0444, ibmps_show_status_byte, NULL, 6);
+static SENSOR_DEVICE_ATTR(status_fan, 0444, ibmps_show_status_byte, NULL, 7);
+
+static struct attribute *ibmps_attributes[] = {
+	&dev_attr_clear_faults.attr,
+	&dev_attr_status_word.attr,
+	&sensor_dev_attr_status_vout.dev_attr.attr,
+	&sensor_dev_attr_status_iout.dev_attr.attr,
+	&sensor_dev_attr_status_input.dev_attr.attr,
+	&sensor_dev_attr_status_temp.dev_attr.attr,
+	&sensor_dev_attr_status_cml.dev_attr.attr,
+	&sensor_dev_attr_status_other.dev_attr.attr,
+	&sensor_dev_attr_status_mfr.dev_attr.attr,
+	&sensor_dev_attr_status_fan.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group ibmps_attribute_group = {
+	.attrs = ibmps_attributes,
+};
+
 static int ibmps_probe(struct i2c_client *client,
 		       const struct i2c_device_id *id)
 {
+	int rc = sysfs_create_group(&client->dev.kobj,
+				    &ibmps_attribute_group);
+	if (rc)
+		return rc;
+
 	return pmbus_do_probe(client, id, &ibmps_info);
 }
 
 static int ibmps_remove(struct i2c_client *client)
 {
+	sysfs_remove_group(&client->dev.kobj, &ibmps_attribute_group);
+
 	return pmbus_do_remove(client);
 }
 
-- 
1.8.3.1

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#1708699 — Re: [PATCH 2/4] drivers/hwmon/pmbus: ibmps: Add non-hwmon attributes

On Wed, Aug 02, 2017 at 04:17:11PM -0500, Eddie James wrote:
> From: "Edward A. James" <eajames@us.ibm.com>
> 
> Add sysfs entries to dump out PS registers and clear faults.
> 
> Signed-off-by: Edward A. James <eajames@us.ibm.com>
> ---
>  drivers/hwmon/pmbus/ibmps.c | 78 +++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 78 insertions(+)
> 
> diff --git a/drivers/hwmon/pmbus/ibmps.c b/drivers/hwmon/pmbus/ibmps.c
> index 1928dd9..f55d2bf 100644
> --- a/drivers/hwmon/pmbus/ibmps.c
> +++ b/drivers/hwmon/pmbus/ibmps.c
> @@ -9,8 +9,10 @@
>  
>  #include <linux/device.h>
>  #include <linux/i2c.h>
> +#include <linux/hwmon-sysfs.h>
>  #include <linux/jiffies.h>
>  #include <linux/module.h>
> +#include <linux/sysfs.h>
>  
>  #include "pmbus.h"
>  
> @@ -122,14 +124,90 @@ static int ibmps_read_word_data(struct i2c_client *client, int page, int reg)
>  	.read_word_data = ibmps_read_word_data,
>  };
>  
> +static ssize_t ibmps_clear_faults(struct device *dev,
> +				  struct device_attribute *dev_attr,
> +				  const char *buf, size_t count)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +
> +	pmbus_clear_faults(client);
> +
> +	return count;
> +}
> +static DEVICE_ATTR(clear_faults, 0200, NULL, ibmps_clear_faults);
> +
This is unacceptable as a driver specific attribute. It does
nothing driver specific. I'll have to look into it, but isn't there
a standard attribute we could use for that ?

> +static ssize_t ibmps_show_status_word(struct device *dev,
> +				      struct device_attribute *dev_attr,
> +				      char *buf)
> +{
> +	int rc;
> +	struct i2c_client *client = to_i2c_client(dev);
> +
> +	rc = pmbus_read_word_data(client, 0, PMBUS_STATUS_WORD);
> +	if (rc < 0)
> +		return rc;
> +
> +	return snprintf(buf, PAGE_SIZE - 1, "%04x\n", rc);
> +}
> +static DEVICE_ATTR(status_word, 0444, ibmps_show_status_word, NULL);
> +
> +static ssize_t ibmps_show_status_byte(struct device *dev,
> +				      struct device_attribute *dev_attr,
> +				      char *buf)
> +{
> +	int rc;
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct sensor_device_attribute *sattr = to_sensor_dev_attr(dev_attr);
> +
> +	rc = pmbus_read_byte_data(client, 0, PMBUS_STATUS_VOUT + sattr->index);
> +	if (rc < 0)
> +		return rc;
> +
> +	return snprintf(buf, PAGE_SIZE - 1, "%02x\n", rc);
> +}

As mentioned separately, those are unacceptable.

> +
> +static SENSOR_DEVICE_ATTR(status_vout, 0444, ibmps_show_status_byte, NULL, 0);
> +static SENSOR_DEVICE_ATTR(status_iout, 0444, ibmps_show_status_byte, NULL, 1);
> +static SENSOR_DEVICE_ATTR(status_input, 0444, ibmps_show_status_byte, NULL, 2);
> +static SENSOR_DEVICE_ATTR(status_temp, 0444, ibmps_show_status_byte, NULL, 3);
> +static SENSOR_DEVICE_ATTR(status_cml, 0444, ibmps_show_status_byte, NULL, 4);
> +static SENSOR_DEVICE_ATTR(status_other, 0444, ibmps_show_status_byte, NULL, 5);
> +static SENSOR_DEVICE_ATTR(status_mfr, 0444, ibmps_show_status_byte, NULL, 6);
> +static SENSOR_DEVICE_ATTR(status_fan, 0444, ibmps_show_status_byte, NULL, 7);
> +
> +static struct attribute *ibmps_attributes[] = {
> +	&dev_attr_clear_faults.attr,
> +	&dev_attr_status_word.attr,
> +	&sensor_dev_attr_status_vout.dev_attr.attr,
> +	&sensor_dev_attr_status_iout.dev_attr.attr,
> +	&sensor_dev_attr_status_input.dev_attr.attr,
> +	&sensor_dev_attr_status_temp.dev_attr.attr,
> +	&sensor_dev_attr_status_cml.dev_attr.attr,
> +	&sensor_dev_attr_status_other.dev_attr.attr,
> +	&sensor_dev_attr_status_mfr.dev_attr.attr,
> +	&sensor_dev_attr_status_fan.dev_attr.attr,
> +	NULL
> +};
> +
> +static const struct attribute_group ibmps_attribute_group = {
> +	.attrs = ibmps_attributes,
> +};
> +
>  static int ibmps_probe(struct i2c_client *client,
>  		       const struct i2c_device_id *id)
>  {
> +	int rc = sysfs_create_group(&client->dev.kobj,
> +				    &ibmps_attribute_group);

This is just wrong. It attaches the attributes to the i2c driver, not to the
hwmon driver. If we do need driver specific attributes, we would have to enhance
the pmbus core to accept a sysfs group or list of sysfs groups as additional
parameter to pmbus_do_probe (or to the info data structure).

Guenter
> +	if (rc)
> +		return rc;
> +
>  	return pmbus_do_probe(client, id, &ibmps_info);
>  }
>  
>  static int ibmps_remove(struct i2c_client *client)
>  {
> +	sysfs_remove_group(&client->dev.kobj, &ibmps_attribute_group);
> +
>  	return pmbus_do_remove(client);
>  }
>  
> -- 
> 1.8.3.1
> 
> --
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#1702497 — [PATCH 4/4] Documentation: ABI: Add IBM power supply sysfs documentation

From: "Edward A. James" <eajames@us.ibm.com>

Signed-off-by: Edward A. James <eajames@us.ibm.com>
---
 Documentation/ABI/testing/sysfs-driver-ibmps | 49 ++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-driver-ibmps

diff --git a/Documentation/ABI/testing/sysfs-driver-ibmps b/Documentation/ABI/testing/sysfs-driver-ibmps
new file mode 100644
index 0000000..1645685
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-driver-ibmps
@@ -0,0 +1,49 @@
+What:		/sys/bus/i2c/devices/<dev>/clear_faults
+KernelVersion:	4.13
+Contact:	eajames@us.ibm.com
+Description:	Clears pmbus faults for this power supply.
+
+What:		/sys/bus/i2c/devices/<dev>/status_word
+KernelVersion:	4.13
+Contact:	eajames@us.ibm.com
+Description:	Displays the STATUS_WORD register.
+
+What:		/sys/bus/i2c/devices/<dev>/status_vout
+KernelVersion:	4.13
+Contact:	eajames@us.ibm.com
+Description:	Displays the STATUS_VOUT register.
+
+What:		/sys/bus/i2c/devices/<dev>/status_iout
+KernelVersion:	4.13
+Contact:	eajames@us.ibm.com
+Description:	Displays the STATUS_IOUT register.
+
+What:		/sys/bus/i2c/devices/<dev>/status_input
+KernelVersion:	4.13
+Contact:	eajames@us.ibm.com
+Description:	Displays the STATUS_INPUT register.
+
+What:		/sys/bus/i2c/devices/<dev>/status_temp
+KernelVersion:	4.13
+Contact:	eajames@us.ibm.com
+Description:	Displays the STATUS_TEMPERATURE register.
+
+What:		/sys/bus/i2c/devices/<dev>/status_cml
+KernelVersion:	4.13
+Contact:	eajames@us.ibm.com
+Description:	Displays the STATUS_CML register.
+
+What:		/sys/bus/i2c/devices/<dev>/status_other
+KernelVersion:	4.13
+Contact:	eajames@us.ibm.com
+Description:	Displays the STATUS_OTHER register.
+
+What:		/sys/bus/i2c/devices/<dev>/status_mfr
+KernelVersion:	4.13
+Contact:	eajames@us.ibm.com
+Description:	Displays the STATUS_MFR_SPECIFIC register.
+
+What:		/sys/bus/i2c/devices/<dev>/status_fan
+KernelVersion:	4.13
+Contact:	eajames@us.ibm.com
+Description:	Displays the STATUS_FAN register.
-- 
1.8.3.1

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#1708702 — Re: [PATCH 4/4] Documentation: ABI: Add IBM power supply sysfs documentation

On Wed, Aug 02, 2017 at 04:17:13PM -0500, Eddie James wrote:
> From: "Edward A. James" <eajames@us.ibm.com>
> 
> Signed-off-by: Edward A. James <eajames@us.ibm.com>
> ---
>  Documentation/ABI/testing/sysfs-driver-ibmps | 49 ++++++++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-driver-ibmps
> 
> diff --git a/Documentation/ABI/testing/sysfs-driver-ibmps b/Documentation/ABI/testing/sysfs-driver-ibmps
> new file mode 100644
> index 0000000..1645685
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-driver-ibmps
> @@ -0,0 +1,49 @@
> +What:		/sys/bus/i2c/devices/<dev>/clear_faults

Please, no. If we do add driver-specific attributes, those should be added to
the hwmon device, not to the i2c device.

Guenter

> +KernelVersion:	4.13
> +Contact:	eajames@us.ibm.com
> +Description:	Clears pmbus faults for this power supply.
> +
> +What:		/sys/bus/i2c/devices/<dev>/status_word
> +KernelVersion:	4.13
> +Contact:	eajames@us.ibm.com
> +Description:	Displays the STATUS_WORD register.
> +
> +What:		/sys/bus/i2c/devices/<dev>/status_vout
> +KernelVersion:	4.13
> +Contact:	eajames@us.ibm.com
> +Description:	Displays the STATUS_VOUT register.
> +
> +What:		/sys/bus/i2c/devices/<dev>/status_iout
> +KernelVersion:	4.13
> +Contact:	eajames@us.ibm.com
> +Description:	Displays the STATUS_IOUT register.
> +
> +What:		/sys/bus/i2c/devices/<dev>/status_input
> +KernelVersion:	4.13
> +Contact:	eajames@us.ibm.com
> +Description:	Displays the STATUS_INPUT register.
> +
> +What:		/sys/bus/i2c/devices/<dev>/status_temp
> +KernelVersion:	4.13
> +Contact:	eajames@us.ibm.com
> +Description:	Displays the STATUS_TEMPERATURE register.
> +
> +What:		/sys/bus/i2c/devices/<dev>/status_cml
> +KernelVersion:	4.13
> +Contact:	eajames@us.ibm.com
> +Description:	Displays the STATUS_CML register.
> +
> +What:		/sys/bus/i2c/devices/<dev>/status_other
> +KernelVersion:	4.13
> +Contact:	eajames@us.ibm.com
> +Description:	Displays the STATUS_OTHER register.
> +
> +What:		/sys/bus/i2c/devices/<dev>/status_mfr
> +KernelVersion:	4.13
> +Contact:	eajames@us.ibm.com
> +Description:	Displays the STATUS_MFR_SPECIFIC register.
> +
> +What:		/sys/bus/i2c/devices/<dev>/status_fan
> +KernelVersion:	4.13
> +Contact:	eajames@us.ibm.com
> +Description:	Displays the STATUS_FAN register.
> -- 
> 1.8.3.1
> 
> --
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#1702504 — [PATCH 3/4] Documentation: hwmon: Add IBM power supply documentation

From: "Edward A. James" <eajames@us.ibm.com>

Signed-off-by: Edward A. James <eajames@us.ibm.com>
---
 Documentation/hwmon/ibmps | 53 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 Documentation/hwmon/ibmps

diff --git a/Documentation/hwmon/ibmps b/Documentation/hwmon/ibmps
new file mode 100644
index 0000000..7f13fd4
--- /dev/null
+++ b/Documentation/hwmon/ibmps
@@ -0,0 +1,53 @@
+Kernel driver ibmps
+====================
+
+Supported chips:
+  * IBM Witherspoon power supply
+
+Author: Eddie James <eajames@us.ibm.com>
+
+Description
+-----------
+
+This driver supports the IBM power supply. This driver is a client to the core
+PMBus driver.
+
+Usage Notes
+-----------
+
+This driver should auto-detect devices. In the event that it does not, you will
+have to instantiate the devices explicitly. Please see
+Documentation/i2c/instantiating-devices for details.
+
+Sysfs entries
+-------------
+
+The following attributes are supported:
+
+curr1_alarm		Output current over-current fault.
+curr1_input		Measured output current in mA.
+curr1_label		"iout1"
+
+fan1_alarm		Fan 1 warning.
+fan1_fault		Fan 1 fault.
+fan1_input		Fan 1 speed in RPM.
+fan2_alarm		Fan 2 warning.
+fan2_fault		Fan 2 fault.
+fan2_input		Fan 2 speed in RPM.
+
+in1_alarm		Input voltage under-voltage fault.
+in1_input		Measured input voltage in mV.
+in1_label		"vin"
+in2_alarm		Output voltage over-voltage fault.
+in2_input		Measured output voltage in mV.
+in2_label		"vout1"
+
+power1_input		Measured input power in uW.
+power1_label		"pin"
+
+temp1_alarm		PSU inlet ambient temperature over-temperature fault.
+temp1_input		Measured PSU inlet ambient temp in millidegrees C.
+temp2_alarm		Secondary rectifier temp over-temperature fault.
+temp2_input		Measured secondary rectifier temp in millidegrees C.
+temp3_alarm		ORing FET temperature over-temperature fault.
+temp3_input		Measured ORing FET temperature in millidegrees C.
-- 
1.8.3.1

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#1708704 — Re: [PATCH 3/4] Documentation: hwmon: Add IBM power supply documentation

On Wed, Aug 02, 2017 at 04:17:12PM -0500, Eddie James wrote:
> From: "Edward A. James" <eajames@us.ibm.com>
> 
> Signed-off-by: Edward A. James <eajames@us.ibm.com>
> ---
>  Documentation/hwmon/ibmps | 53 +++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 53 insertions(+)
>  create mode 100644 Documentation/hwmon/ibmps
> 
> diff --git a/Documentation/hwmon/ibmps b/Documentation/hwmon/ibmps
> new file mode 100644
> index 0000000..7f13fd4
> --- /dev/null
> +++ b/Documentation/hwmon/ibmps
> @@ -0,0 +1,53 @@
> +Kernel driver ibmps
> +====================
> +
> +Supported chips:
> +  * IBM Witherspoon power supply
> +
if the power supply is "witherspoon", maybe that should be the name of the
driver instead of "ibmps".

Guenter

> +Author: Eddie James <eajames@us.ibm.com>
> +
> +Description
> +-----------
> +
> +This driver supports the IBM power supply. This driver is a client to the core
> +PMBus driver.
> +
> +Usage Notes
> +-----------
> +
> +This driver should auto-detect devices. In the event that it does not, you will
> +have to instantiate the devices explicitly. Please see
> +Documentation/i2c/instantiating-devices for details.
> +
> +Sysfs entries
> +-------------
> +
> +The following attributes are supported:
> +
> +curr1_alarm		Output current over-current fault.
> +curr1_input		Measured output current in mA.
> +curr1_label		"iout1"
> +
> +fan1_alarm		Fan 1 warning.
> +fan1_fault		Fan 1 fault.
> +fan1_input		Fan 1 speed in RPM.
> +fan2_alarm		Fan 2 warning.
> +fan2_fault		Fan 2 fault.
> +fan2_input		Fan 2 speed in RPM.
> +
> +in1_alarm		Input voltage under-voltage fault.
> +in1_input		Measured input voltage in mV.
> +in1_label		"vin"
> +in2_alarm		Output voltage over-voltage fault.
> +in2_input		Measured output voltage in mV.
> +in2_label		"vout1"
> +
> +power1_input		Measured input power in uW.
> +power1_label		"pin"
> +
> +temp1_alarm		PSU inlet ambient temperature over-temperature fault.
> +temp1_input		Measured PSU inlet ambient temp in millidegrees C.
> +temp2_alarm		Secondary rectifier temp over-temperature fault.
> +temp2_input		Measured secondary rectifier temp in millidegrees C.
> +temp3_alarm		ORing FET temperature over-temperature fault.
> +temp3_input		Measured ORing FET temperature in millidegrees C.
> -- 
> 1.8.3.1
> 
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