[PATCH openbmc] Add temporary adm1278 hwmon pmbus driver patch
Adriana Kobylak
anoo at us.ibm.com
Wed Mar 2 08:15:12 AEDT 2016
What makes this pull request different from other openbmc changes to
require to be sent via git-send-email before it can be reviewed?
From: Joel Stanley <joel at jms.id.au>
To: OpenBMC Patches <openbmc-patches at stwcx.xyz>
Cc: OpenBMC Maillist <openbmc at lists.ozlabs.org>
Date: 02/17/2016 10:24 PM
Subject: Re: [PATCH openbmc] Add temporary adm1278 hwmon pmbus
driver patch
Sent by: "openbmc"
<openbmc-bounces+anoo=us.ibm.com at lists.ozlabs.org>
On Wed, Feb 17, 2016 at 9:00 PM, OpenBMC Patches
<openbmc-patches at stwcx.xyz> wrote:
> From: Yi Li <adamliyi at msn.com>
>
> This patch temporarily adds adm1278 hwmon driver as a kernel patch to
openbmc,
> for testing on Barreleye.
Can you please send this as a patch with git-send-email so we can review
it.
> If in the future this patch will still be useful, it should be put into
linux kernel.
>
> Barreleye has three adm1278 devices on three i2c buses.
> This patch enables reading adm1278 sensors via hwmon sysfs interface.
> The enabled sensors are: current, voltage (In and Out), power and
temperature.
> Detail usage can be found in 'readme_adm1278.txt'.
>
> Signed-off-by: Yi Li <adamliyi at msn.com>
> ---
> .../recipes-kernel/linux/linux-obmc/barreleye.cfg | 3 +
> .../linux/linux-obmc/hwmon_adm1278.patch | 165
+++++++++++++++++++++
> .../linux/linux-obmc/readme_adm1278.txt | 78 ++++++++++
> .../recipes-kernel/linux/linux-obmc_%.bbappend | 3 +
> 4 files changed, 249 insertions(+)
> create mode 100644
meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/barreleye.cfg
> create mode 100644
meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/hwmon_adm1278.patch
> create mode 100644
meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/readme_adm1278.txt
> create mode 100644
meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc_%.bbappend
>
> diff --git
a/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/barreleye.cfg
b/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/barreleye.cfg
> new file mode 100644
> index 0000000..086f191
> --- /dev/null
> +++
b/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/barreleye.cfg
> @@ -0,0 +1,3 @@
> +CONFIG_PMBUS=y
> +CONFIG_SENSORS_PMBUS=y
> +CONFIG_SENSORS_ADM1275=y
> diff --git
a/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/hwmon_adm1278.patch
b/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/hwmon_adm1278.patch
> new file mode 100644
> index 0000000..074d39f
> --- /dev/null
> +++
b/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/hwmon_adm1278.patch
> @@ -0,0 +1,165 @@
> +diff --git a/drivers/hwmon/pmbus/adm1275.c
b/drivers/hwmon/pmbus/adm1275.c
> +index 188af4c..a45075d 100644
> +--- a/drivers/hwmon/pmbus/adm1275.c
> ++++ b/drivers/hwmon/pmbus/adm1275.c
> +@@ -24,7 +24,7 @@
> + #include <linux/bitops.h>
> + #include "pmbus.h"
> +
> +-enum chips { adm1075, adm1275, adm1276, adm1293, adm1294 };
> ++enum chips { adm1075, adm1275, adm1276, adm1278, adm1293, adm1294 };
> +
> + #define ADM1275_MFR_STATUS_IOUT_WARN2 BIT(0)
> + #define ADM1293_MFR_STATUS_VAUX_UV_WARN BIT(5)
> +@@ -70,6 +70,22 @@ enum chips { adm1075, adm1275, adm1276, adm1293,
adm1294 };
> + #define ADM1075_VAUX_OV_WARN BIT(7)
> + #define ADM1075_VAUX_UV_WARN BIT(6)
> +
> ++#define ADM1278_PMON_CONTROL 0xd3
> ++#define ADM1278_PMON_CONFIG 0xd4
> ++#define ADM1278_CFG_TSFLT BIT(15)
> ++#define ADM1278_CFG_SIMULTANEOUS BIT(14)
> ++#define ADM1278_CFG_PMON_MODE BIT(4)
> ++#define ADM1278_CFG_TEMP1_EN BIT(3)
> ++#define ADM1278_CFG_VIN_EN BIT(2)
> ++#define ADM1278_CFG_VOUT_EN BIT(1)
> ++#define ADM1278_PEAK_TEMPERATURE 0xd7
> ++
> ++#define ADM1278_R_SENSE 1000 /* R_sense resistor value in
microohmsi */
> ++
> ++static int r_sense = ADM1278_R_SENSE;
> ++module_param(r_sense, int, 0644);
> ++MODULE_PARM_DESC(r_sense, "Rsense resistor value in microohms");
> ++
> + struct adm1275_data {
> + int id;
> + bool have_oc_fault;
> +@@ -186,6 +202,11 @@ static int adm1275_read_word_data(struct
i2c_client *client, int page, int reg)
> + case PMBUS_VIRT_READ_VIN_MAX:
> + ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
> + break;
> ++ case PMBUS_VIRT_READ_TEMP_MAX:
> ++ if (data->id != adm1278)
> ++ return -ENODATA;
> ++ ret = pmbus_read_word_data(client, 0,
ADM1278_PEAK_TEMPERATURE);
> ++ break;
> + case PMBUS_VIRT_READ_PIN_MIN:
> + if (!data->have_pin_min)
> + return -ENXIO;
> +@@ -199,6 +220,7 @@ static int adm1275_read_word_data(struct i2c_client
*client, int page, int reg)
> + case PMBUS_VIRT_RESET_IOUT_HISTORY:
> + case PMBUS_VIRT_RESET_VOUT_HISTORY:
> + case PMBUS_VIRT_RESET_VIN_HISTORY:
> ++ case PMBUS_VIRT_RESET_TEMP_HISTORY:
> + break;
> + case PMBUS_VIRT_RESET_PIN_HISTORY:
> + if (!data->have_pin_max)
> +@@ -239,6 +261,9 @@ static int adm1275_write_word_data(struct
i2c_client *client, int page, int reg,
> + case PMBUS_VIRT_RESET_VIN_HISTORY:
> + ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN,
0);
> + break;
> ++ case PMBUS_VIRT_RESET_TEMP_HISTORY:
> ++ ret = pmbus_write_word_data(client, 0,
ADM1278_PEAK_TEMPERATURE, 0);
> ++ break;
> + case PMBUS_VIRT_RESET_PIN_HISTORY:
> + ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN,
0);
> + if (!ret && data->have_pin_min)
> +@@ -312,6 +337,7 @@ static const struct i2c_device_id adm1275_id[] = {
> + { "adm1075", adm1075 },
> + { "adm1275", adm1275 },
> + { "adm1276", adm1276 },
> ++ { "adm1278", adm1278 },
> + { "adm1293", adm1293 },
> + { "adm1294", adm1294 },
> + { }
> +@@ -335,6 +361,8 @@ static int adm1275_probe(struct i2c_client *client,
> + | I2C_FUNC_SMBUS_BLOCK_DATA))
> + return -ENODEV;
> +
> ++ /* i2c_aspeed driver does not handle i2c_smbus_read_block_data
correctly */
> ++#if 0
> + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID,
block_buffer);
> + if (ret < 0) {
> + dev_err(&client->dev, "Failed to read Manufacturer
ID\n");
> +@@ -363,6 +391,7 @@ static int adm1275_probe(struct i2c_client *client,
> + dev_notice(&client->dev,
> + "Device mismatch: Configured %s, detected
%s\n",
> + id->name, mid->name);
> ++#endif
> +
> + config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
> + if (config < 0)
> +@@ -377,7 +406,9 @@ static int adm1275_probe(struct i2c_client *client,
> + if (!data)
> + return -ENOMEM;
> +
> +- data->id = mid->driver_data;
> ++ /* i2c_aspeed driver does not handle i2c_smbus_read_block_data
correctly */
> ++ //data->id = mid->driver_data;
> ++ data->id = adm1278;
> +
> + info = &data->info;
> +
> +@@ -460,6 +491,62 @@ static int adm1275_probe(struct i2c_client
*client,
> + info->func[0] |=
> + PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
> + break;
> ++ case adm1278:
> ++ /* Configure monitoring */
> ++ ret = i2c_smbus_write_byte_data(client,
> ++ ADM1278_PMON_CONTROL, 0);
> ++ if (ret < 0)
> ++ return ret;
> ++ ret = i2c_smbus_read_word_data(client,
ADM1275_PMON_CONFIG);
> ++ ret = i2c_smbus_write_word_data(client,
ADM1275_PMON_CONFIG,
> ++ ADM1278_CFG_PMON_MODE |
> ++ ADM1278_CFG_TEMP1_EN |
> ++ ADM1278_CFG_VIN_EN |
> ++ ADM1278_CFG_VOUT_EN);
> ++ if (ret < 0)
> ++ return ret;
> ++ ret = i2c_smbus_read_word_data(client,
ADM1275_PMON_CONFIG);
> ++ dev_info(&client->dev, "adm1278 config: 0x%x\n", ret);
> ++ ret = i2c_smbus_write_byte_data(client,
ADM1278_PMON_CONTROL,1);
> ++ if (ret < 0)
> ++ return ret;
> ++
> ++ info->func[0] |= PMBUS_HAVE_VIN
> ++ | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
> ++ | PMBUS_HAVE_PIN
> ++ | PMBUS_HAVE_STATUS_INPUT
> ++ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
> ++
> ++ data->have_oc_fault = false;
> ++ data->have_uc_fault = false;
> ++ data->have_vout = true;
> ++ data->have_vaux_status = false;
> ++ data->have_mfr_vaux_status = false;
> ++ data->have_iout_min = false;
> ++ data->have_pin_min = false;
> ++ data->have_pin_max = true;
> ++
> ++ info->m[PSC_VOLTAGE_IN] = 19599;
> ++ info->b[PSC_VOLTAGE_IN] = 0;
> ++ info->R[PSC_VOLTAGE_IN] = -2;
> ++
> ++ info->m[PSC_VOLTAGE_OUT] = 19599;
> ++ info->b[PSC_VOLTAGE_OUT] = 0;
> ++ info->R[PSC_VOLTAGE_OUT] = -2;
> ++
> ++ info->m[PSC_CURRENT_OUT] = 800 * r_sense / 1000;
> ++ info->b[PSC_CURRENT_OUT] = 20475;
> ++ info->R[PSC_CURRENT_OUT] = -1;
> ++
> ++ info->m[PSC_POWER] = 6123 * r_sense / 1000;
> ++ info->b[PSC_POWER] = 0;
> ++ info->R[PSC_POWER] = -2;
> ++
> ++ info->format[PSC_TEMPERATURE] = direct;
> ++ info->m[PSC_TEMPERATURE] = 42;
> ++ info->b[PSC_TEMPERATURE] = 31880;
> ++ info->R[PSC_TEMPERATURE] = -1;
> ++ break;
> + case adm1293:
> + case adm1294:
> + data->have_iout_min = true;
> diff --git
a/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/readme_adm1278.txt
b/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/readme_adm1278.txt
> new file mode 100644
> index 0000000..e86d977
> --- /dev/null
> +++
b/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc/readme_adm1278.txt
> @@ -0,0 +1,78 @@
> +README for adm1278 hwmon driver
> +==================================
> +Yi Li <shliyi at cn.ibm.com>
> +
> +
> +This is a temporary kernel patch to enable hwmon driver for adm1278
chip on Barreleye.
> +When this patch is merged into linux kernel, this patch will be removed
from openbmc.
> +
> +The adm1278 driver is created according to datasheet:
>
+http://www.analog.com/media/en/technical-documentation/data-sheets/ADM1278.pdf
> +
> +The patch heavily re-used adm1278 enabling code from:
https://github.com/facebook/openbmc/blob/master/meta-aspeed/recipes-kernel/linux/files/patch-2.6.28.9/0000-linux-openbmc.patch
.
> +
> +This patch has been tested on barreleye, by following these steps:
> +
> +1) There are 3 adm1278 devices on Barreleye
> +
> +I2C5: P12v_a for CPU0
> +I2C6: P12v_b for CPU1
> +I2C7: P12v_c for HDD and IO Board
> +
> +2) adm1278 driver is based on adm1275.c, which depends on pmbus. This
patch builds
> +adm1275 and pmbus into kernel.
> +
> +3) When kernel booted, initialize the adm1278 devices:
> +
> +root at barreleye:~# echo adm1278 0x10 >
/sys/class/i2c-adapter/i2c-4/new_device
> +root at barreleye:~# echo adm1278 0x10 >
/sys/class/i2c-adapter/i2c-5/new_device
> +root at barreleye:~# echo adm1278 0x10 >
/sys/class/i2c-adapter/i2c-6/new_device
> +
> +There will be three new hwmon sysfs entries created:
> +
> +root at barreleye:~# ls /sys/class/hwmon/hwmon3/
> +curr1_highest in1_highest in1_reset_history
in2_min_alarm power1_label temp1_input
> +curr1_input in1_input in2_highest
in2_reset_history power1_max temp1_max
> +curr1_label in1_label in2_input name
power1_reset_history temp1_max_alarm
> +curr1_max in1_max in2_label power/
subsystem/ temp1_reset_history
> +curr1_max_alarm in1_max_alarm in2_max power1_alarm
temp1_crit uevent
> +curr1_reset_history in1_min in2_max_alarm power1_input
temp1_crit_alarm
> +device/ in1_min_alarm in2_min
power1_input_highest temp1_highest
> +root at barreleye:~# ls /sys/class/hwmon/hwmon4/
> +curr1_highest in1_highest in1_reset_history
in2_min_alarm power1_label temp1_input
> +curr1_input in1_input in2_highest
in2_reset_history power1_max temp1_max
> +curr1_label in1_label in2_input name
power1_reset_history temp1_max_alarm
> +curr1_max in1_max in2_label power/
subsystem/ temp1_reset_history
> +curr1_max_alarm in1_max_alarm in2_max power1_alarm
temp1_crit uevent
> +curr1_reset_history in1_min in2_max_alarm power1_input
temp1_crit_alarm
> +device/ in1_min_alarm in2_min
power1_input_highest temp1_highest
> +root at barreleye:~# ls /sys/class/hwmon/hwmon5/
> +curr1_highest in1_highest in1_reset_history
in2_min_alarm power1_label temp1_input
> +curr1_input in1_input in2_highest
in2_reset_history power1_max temp1_max
> +curr1_label in1_label in2_input name
power1_reset_history temp1_max_alarm
> +curr1_max in1_max in2_label power/
subsystem/ temp1_reset_history
> +curr1_max_alarm in1_max_alarm in2_max power1_alarm
temp1_crit uevent
> +curr1_reset_history in1_min in2_max_alarm power1_input
temp1_crit_alarm
> +device/ in1_min_alarm in2_min
power1_input_highest temp1_highest
> +
> +4) For details of what each hwmon sysfs attributes mean, please refer
to:
> +https://www.kernel.org/doc/Documentation/hwmon/pmbus
> +For short, 'curr1_*' refers to 'IOUT', 'in1_*' refers to 'vin', 'in2_*'
refers to 'vout', 'power1_*' refers to 'input power',
> +'temp1_*' for 'temperature'.
> +
> +5) Remaining issue:
> +
> +5.1) Currently, i2c_aspeed driver does not handle
"i2c_smbus_read_block_data()" correctly. So this patch has to bypass some
detection code.
> +We need to fix this issue when the patch is merged to kernel.
> +5.2) According to adm1278 datasheet, there is a sense resistor used to
measure power and current. The resistor will affect conversion between
> +adm1278 register value to real-world value for current and power. I am
not very sure about the resistor value. So using 1 mili-ohms (or 1000
micro-ohms) as default value. When build the adm1275 driver as kernel
module, we can set this resistor value by:
> +
> +# insmod adm1275.ko r_sense=500
> +
> +This will set the 'sense resistor' to 500 micro-ohms.
> +5.3) Some of the sensor value, e.g, 'temp1_input' seems not reasonable,
e.g:
> +
> +root at barreleye:~# cat /sys/class/hwmon/hwmon4/temp1_input
> +-270952
> +
> +Need further check on that.
> diff --git
a/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc_%.bbappend
b/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc_%.bbappend
> new file mode 100644
> index 0000000..b6e8e16
> --- /dev/null
> +++
b/meta-openbmc-machines/meta-openpower/meta-rackspace/meta-barreleye/recipes-kernel/linux/linux-obmc_%.bbappend
> @@ -0,0 +1,3 @@
> +FILESEXTRAPATHS_prepend := "${THISDIR}/linux-obmc:"
> +SRC_URI += "file://barreleye.cfg"
> +SRC_URI += "file://hwmon_adm1278.patch"
> --
> 2.7.1
>
>
> _______________________________________________
> openbmc mailing list
> openbmc at lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/openbmc
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