From 709066acdd12c3312c94ebccc37630932e381949 Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@roeck-us.net>
Date: Sun, 5 Jul 2015 11:04:56 -0700
Subject: [PATCH] hwmon: (adm1275) Add support for ADM1278
ADM1278 is mostly compatible to other chips of the same series.
Besides the usual difference in coefficients, it supports
a temperature sensor, and it can measure both input and output
voltage at the same time.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
Documentation/hwmon/adm1275 | 27 +++++++++++++----
drivers/hwmon/pmbus/Kconfig | 4 +--
drivers/hwmon/pmbus/adm1275.c | 56 ++++++++++++++++++++++++++++++++++-
3 files changed, 79 insertions(+), 8 deletions(-)
diff --git a/Documentation/hwmon/adm1275 b/Documentation/hwmon/adm1275
index 04e8e4adf4a1..791bc0bd91e6 100644
--- a/Documentation/hwmon/adm1275
+++ b/Documentation/hwmon/adm1275
@@ -14,6 +14,10 @@ Supported chips:
Prefix: 'adm1276'
Addresses scanned: -
Datasheet: www.analog.com/static/imported-files/data_sheets/ADM1276.pdf
+ * Analog Devices ADM1278
+ Prefix: 'adm1278'
+ Addresses scanned: -
+ Datasheet: www.analog.com/static/imported-files/data_sheets/ADM1278.pdf
* Analog Devices ADM1293/ADM1294
Prefix: 'adm1293', 'adm1294'
Addresses scanned: -
@@ -26,12 +30,14 @@ Description
-----------
This driver supports hardware monitoring for Analog Devices ADM1075, ADM1275,
-ADM1276, ADM1293, and ADM1294 Hot-Swap Controller and Digital Power Monitors.
+ADM1276, ADM1278, ADM1293, and ADM1294 Hot-Swap Controller and Digital
+Power Monitors.
-ADM1075, ADM1275, ADM1276, ADM1293, and ADM1294 are hot-swap controllers that
-allow a circuit board to be removed from or inserted into a live backplane.
-They also feature current and voltage readback via an integrated 12
-bit analog-to-digital converter (ADC), accessed using a PMBus interface.
+ADM1075, ADM1275, ADM1276, ADM1278, ADM1293, and ADM1294 are hot-swap
+controllers that allow a circuit board to be removed from or inserted into
+a live backplane. They also feature current and voltage readback via an
+integrated 12 bit analog-to-digital converter (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.
@@ -96,3 +102,14 @@ power1_reset_history Write any value to reset history.
Power attributes are supported on ADM1075, ADM1276,
ADM1293, and ADM1294.
+
+temp1_input Chip temperature.
+ Temperature attributes are only available on ADM1278.
+temp1_max Maximum chip temperature.
+temp1_max_alarm Temperature alarm.
+temp1_crit Critical chip temperature.
+temp1_crit_alarm Critical temperature high alarm.
+temp1_highest Highest observed temperature.
+temp1_reset_history Write any value to reset history.
+
+ Temperature attributes are supported on ADM1278.
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 7e5cc3d025ef..054d3d863802 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -31,8 +31,8 @@ config SENSORS_ADM1275
default n
help
If you say yes here you get hardware monitoring support for Analog
- Devices ADM1075, ADM1275, ADM1276, ADM1293, and ADM1294 Hot-Swap
- Controller and Digital Power Monitors.
+ Devices ADM1075, ADM1275, ADM1276, ADM1278, ADM1293, and ADM1294
+ Hot-Swap Controller and Digital Power Monitors.
This driver can also be built as a module. If so, the module will
be called adm1275.
diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c
index 188af4c89f40..3baa4f4a8c5e 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)
@@ -41,6 +41,10 @@ enum chips { adm1075, adm1275, adm1276, adm1293, adm1294 };
#define ADM1075_IRANGE_25 BIT(3)
#define ADM1075_IRANGE_MASK (BIT(3) | BIT(4))
+#define ADM1278_TEMP1_EN BIT(3)
+#define ADM1278_VIN_EN BIT(2)
+#define ADM1278_VOUT_EN BIT(1)
+
#define ADM1293_IRANGE_25 0
#define ADM1293_IRANGE_50 BIT(6)
#define ADM1293_IRANGE_100 BIT(7)
@@ -54,6 +58,7 @@ enum chips { adm1075, adm1275, adm1276, adm1293, adm1294 };
#define ADM1293_VAUX_EN BIT(1)
+#define ADM1278_PEAK_TEMP 0xd7
#define ADM1275_IOUT_WARN2_LIMIT 0xd7
#define ADM1275_DEVICE_CONFIG 0xd8
@@ -80,6 +85,7 @@ struct adm1275_data {
bool have_iout_min;
bool have_pin_min;
bool have_pin_max;
+ bool have_temp_max;
struct pmbus_driver_info info;
};
@@ -113,6 +119,13 @@ static const struct coefficients adm1276_coefficients[] = {
[4] = { 2115, 0, -1 }, /* power, vrange not set */
};
+static const struct coefficients adm1278_coefficients[] = {
+ [0] = { 19599, 0, -2 }, /* voltage */
+ [1] = { 800, 20475, -1 }, /* current */
+ [2] = { 6123, 0, -2 }, /* power */
+ [3] = { 42, 31880, -1 }, /* temperature */
+};
+
static const struct coefficients adm1293_coefficients[] = {
[0] = { 3333, -1, 0 }, /* voltage, vrange 1.2V */
[1] = { 5552, -5, -1 }, /* voltage, vrange 7.4V */
@@ -196,6 +209,11 @@ static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
return -ENXIO;
ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN);
break;
+ case PMBUS_VIRT_READ_TEMP_MAX:
+ if (!data->have_temp_max)
+ return -ENXIO;
+ ret = pmbus_read_word_data(client, 0, ADM1278_PEAK_TEMP);
+ break;
case PMBUS_VIRT_RESET_IOUT_HISTORY:
case PMBUS_VIRT_RESET_VOUT_HISTORY:
case PMBUS_VIRT_RESET_VIN_HISTORY:
@@ -204,6 +222,10 @@ static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
if (!data->have_pin_max)
return -ENXIO;
break;
+ case PMBUS_VIRT_RESET_TEMP_HISTORY:
+ if (!data->have_temp_max)
+ return -ENXIO;
+ break;
default:
ret = -ENODATA;
break;
@@ -245,6 +267,9 @@ static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
ret = pmbus_write_word_data(client, 0,
ADM1293_PIN_MIN, 0);
break;
+ case PMBUS_VIRT_RESET_TEMP_HISTORY:
+ ret = pmbus_write_word_data(client, 0, ADM1278_PEAK_TEMP, 0);
+ break;
default:
ret = -ENODATA;
break;
@@ -312,6 +337,7 @@ static const struct i2c_device_id adm1275_id[] = {
{ "adm1075", adm1075 },
{ "adm1275", adm1275 },
{ "adm1276", adm1276 },
+ { "adm1278", adm1278 },
{ "adm1293", adm1293 },
{ "adm1294", adm1294 },
{ }
@@ -329,6 +355,7 @@ static int adm1275_probe(struct i2c_client *client,
const struct i2c_device_id *mid;
const struct coefficients *coefficients;
int vindex = -1, voindex = -1, cindex = -1, pindex = -1;
+ int tindex = -1;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA
@@ -386,6 +413,7 @@ static int adm1275_probe(struct i2c_client *client,
info->format[PSC_VOLTAGE_OUT] = direct;
info->format[PSC_CURRENT_OUT] = direct;
info->format[PSC_POWER] = direct;
+ info->format[PSC_TEMPERATURE] = direct;
info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
info->read_word_data = adm1275_read_word_data;
@@ -460,6 +488,27 @@ static int adm1275_probe(struct i2c_client *client,
info->func[0] |=
PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
break;
+ case adm1278:
+ data->have_vout = true;
+ data->have_pin_max = true;
+ data->have_temp_max = true;
+
+ coefficients = adm1278_coefficients;
+ vindex = 0;
+ cindex = 1;
+ pindex = 2;
+ tindex = 3;
+
+ info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT;
+ if (config & ADM1278_TEMP1_EN)
+ info->func[0] |=
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+ if (config & ADM1278_VIN_EN)
+ info->func[0] |= PMBUS_HAVE_VIN;
+ if (config & ADM1278_VOUT_EN)
+ info->func[0] |=
+ PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
+ break;
case adm1293:
case adm1294:
data->have_iout_min = true;
@@ -537,6 +586,11 @@ static int adm1275_probe(struct i2c_client *client,
info->b[PSC_POWER] = coefficients[pindex].b;
info->R[PSC_POWER] = coefficients[pindex].R;
}
+ if (tindex >= 0) {
+ info->m[PSC_TEMPERATURE] = coefficients[tindex].m;
+ info->b[PSC_TEMPERATURE] = coefficients[tindex].b;
+ info->R[PSC_TEMPERATURE] = coefficients[tindex].R;
+ }
return pmbus_do_probe(client, id, info);
}