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authorGuenter Roeck <linux@roeck-us.net>2015-06-08 09:56:20 -0700
committerGuenter Roeck <linux@roeck-us.net>2015-08-17 11:55:55 -0700
commit649ca820dab3d76e12408b74af3e8e97abb07ae0 (patch)
tree20d6e9797f112f6af616b532b809fd3dd1fd4d2d
parenthwmon: (ltc2978) Add support for LTC3887 (diff)
downloadlinux-dev-649ca820dab3d76e12408b74af3e8e97abb07ae0.tar.xz
linux-dev-649ca820dab3d76e12408b74af3e8e97abb07ae0.zip
hwmon: (ltc2978) Add support for LTC2975
LTC2975 is mostly compatible to LTC2974, but supports input current and power measurement. Tested-by: Michael Jones <mike@proclivis.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
-rw-r--r--Documentation/devicetree/bindings/hwmon/ltc2978.txt3
-rw-r--r--Documentation/hwmon/ltc297847
-rw-r--r--drivers/hwmon/pmbus/Kconfig4
-rw-r--r--drivers/hwmon/pmbus/ltc2978.c104
4 files changed, 125 insertions, 33 deletions
diff --git a/Documentation/devicetree/bindings/hwmon/ltc2978.txt b/Documentation/devicetree/bindings/hwmon/ltc2978.txt
index c1d23c14ddd9..e434d5fba2ae 100644
--- a/Documentation/devicetree/bindings/hwmon/ltc2978.txt
+++ b/Documentation/devicetree/bindings/hwmon/ltc2978.txt
@@ -3,6 +3,7 @@ ltc2978
Required properties:
- compatible: should contain one of:
* "lltc,ltc2974"
+ * "lltc,ltc2975"
* "lltc,ltc2977"
* "lltc,ltc2978"
* "lltc,ltc3880"
@@ -19,7 +20,7 @@ Optional properties:
standard binding for regulators; see regulator.txt.
Valid names of regulators depend on number of supplies supported per device:
- * ltc2974 : vout0 - vout3
+ * ltc2974, ltc2975 : vout0 - vout3
* ltc2977 : vout0 - vout7
* ltc2978 : vout0 - vout7
* ltc3880, ltc3882 : vout0 - vout1
diff --git a/Documentation/hwmon/ltc2978 b/Documentation/hwmon/ltc2978
index ff130997f22e..7e982884e359 100644
--- a/Documentation/hwmon/ltc2978
+++ b/Documentation/hwmon/ltc2978
@@ -6,6 +6,10 @@ Supported chips:
Prefix: 'ltc2974'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc2974
+ * Linear Technology LTC2975
+ Prefix: 'ltc2975'
+ Addresses scanned: -
+ Datasheet: http://www.linear.com/product/ltc2975
* Linear Technology LTC2977
Prefix: 'ltc2977'
Addresses scanned: -
@@ -42,7 +46,7 @@ Author: Guenter Roeck <linux@roeck-us.net>
Description
-----------
-LTC2974 is a quad digital power supply managers.
+LTC2974 and LTC2975 are quad digital power supply managers.
LTC2978 is an octal power supply monitor.
LTC2977 is a pin compatible replacement for LTC2978.
LTC3880, LTC3882, and LTC3887 are dual output poly-phase step-down DC/DC
@@ -71,23 +75,23 @@ in1_label "vin"
in1_input Measured input voltage.
in1_min Minimum input voltage.
in1_max Maximum input voltage.
- LTC2974, LTC2977, and LTC2978 only.
+ LTC2974, LTC2975, LTC2977, and LTC2978 only.
in1_lcrit Critical minimum input voltage.
- LTC2974, LTC2977, and LTC2978 only.
+ LTC2974, LTC2975, LTC2977, and LTC2978 only.
in1_crit Critical maximum input voltage.
in1_min_alarm Input voltage low alarm.
in1_max_alarm Input voltage high alarm.
- LTC2974, LTC2977, and LTC2978 only.
+ LTC2974, LTC2975, LTC2977, and LTC2978 only.
in1_lcrit_alarm Input voltage critical low alarm.
- LTC2974, LTC2977, and LTC2978 only.
+ LTC2974, LTC2975, LTC2977, and LTC2978 only.
in1_crit_alarm Input voltage critical high alarm.
in1_lowest Lowest input voltage.
- LTC2974, LTC2977, and LTC2978 only.
+ LTC2974, LTC2975, LTC2977, and LTC2978 only.
in1_highest Highest input voltage.
in1_reset_history Reset input voltage history.
in[N]_label "vout[1-8]".
- LTC2974: N=2-5
+ LTC2974, LTC2975: N=2-5
LTC2977: N=2-9
LTC2978: N=2-9
LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
@@ -101,13 +105,14 @@ in[N]_min_alarm Output voltage low alarm.
in[N]_max_alarm Output voltage high alarm.
in[N]_lcrit_alarm Output voltage critical low alarm.
in[N]_crit_alarm Output voltage critical high alarm.
-in[N]_lowest Lowest output voltage. LTC2974 and LTC2978 only.
+in[N]_lowest Lowest output voltage. LTC2974, LTC2975,
+ and LTC2978 only.
in[N]_highest Highest output voltage.
in[N]_reset_history Reset output voltage history.
temp[N]_input Measured temperature.
- On LTC2974, temp[1-4] report external temperatures,
- and temp5 reports the chip temperature.
+ On LTC2974 and LTC2975, temp[1-4] report external
+ temperatures, and temp5 reports the chip temperature.
On LTC2977 and LTC2978, only one temperature measurement
is supported and reports the chip temperature.
On LTC3880, LTC3882, LTC3887, and LTM4676, temp1 and
@@ -120,23 +125,24 @@ temp[N]_max Maximum temperature.
temp[N]_lcrit Critical low temperature.
temp[N]_crit Critical high temperature.
temp[N]_min_alarm Temperature low alarm.
- LTC2974, LTC2977, and LTC2978 only.
+ LTC2974, LTC2975, LTC2977, and LTC2978 only.
temp[N]_max_alarm Temperature high alarm.
temp[N]_lcrit_alarm Temperature critical low alarm.
temp[N]_crit_alarm Temperature critical high alarm.
temp[N]_lowest Lowest measured temperature.
- LTC2974, LTC2977, and LTC2978 only.
- Not supported for chip temperature sensor on LTC2974.
+ LTC2974, LTC2975, LTC2977, and LTC2978 only.
+ Not supported for chip temperature sensor on LTC2974 and
+ LTC2975.
temp[N]_highest Highest measured temperature. Not supported for chip
- temperature sensor on LTC2974.
+ temperature sensor on LTC2974 and LTC2975.
temp[N]_reset_history Reset temperature history. Not supported for chip
- temperature sensor on LTC2974.
+ temperature sensor on LTC2974 and LTC2975.
power1_label "pin". LTC3883 only.
power1_input Measured input power.
power[N]_label "pout[1-4]".
- LTC2974: N=1-4
+ LTC2974, LTC2975: N=1-4
LTC2977: Not supported
LTC2978: Not supported
LTC3880, LTC3882, LTC3887, LTM4676: N=1-2
@@ -151,7 +157,7 @@ curr1_highest Highest input current. LTC3883 only.
curr1_reset_history Reset input current history. LTC3883 only.
curr[N]_label "iout[1-4]".
- LTC2974: N=1-4
+ LTC2974, LTC2975: N=1-4
LTC2977: not supported
LTC2978: not supported
LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
@@ -159,10 +165,11 @@ curr[N]_label "iout[1-4]".
curr[N]_input Measured output current.
curr[N]_max Maximum output current.
curr[N]_crit Critical high output current.
-curr[N]_lcrit Critical low output current. LTC2974 only.
+curr[N]_lcrit Critical low output current. LTC2974 and LTC2975 only.
curr[N]_max_alarm Output current high alarm.
curr[N]_crit_alarm Output current critical high alarm.
-curr[N]_lcrit_alarm Output current critical low alarm. LTC2974 only.
-curr[N]_lowest Lowest output current. LTC2974 only.
+curr[N]_lcrit_alarm Output current critical low alarm.
+ LTC2974 and LTC2975 only.
+curr[N]_lowest Lowest output current. LTC2974 and LTC2975 only.
curr[N]_highest Highest output current.
curr[N]_reset_history Reset output current history.
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 43b6de900ce5..8279727987cb 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -52,8 +52,8 @@ config SENSORS_LTC2978
default n
help
If you say yes here you get hardware monitoring support for Linear
- Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, LTC3887,
- and LTM4676.
+ Technology LTC2974, LTC2975, LTC2977, LTC2978, LTC3880, LTC3883,
+ LTC3887, and LTM4676.
This driver can also be built as a module. If so, the module will
be called ltc2978.
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index 0756d8ae9dad..e153ffd59ab0 100644
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -1,9 +1,8 @@
/*
- * Hardware monitoring driver for LTC2974, LTC2977, LTC2978, LTC3880,
- * LTC3883, LTC3887. and LTM4676
+ * Hardware monitoring driver for LTC2978 and compatible chips.
*
* Copyright (c) 2011 Ericsson AB.
- * Copyright (c) 2013, 2014 Guenter Roeck
+ * Copyright (c) 2013, 2014, 2015 Guenter Roeck
*
* 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
@@ -25,8 +24,8 @@
#include <linux/regulator/driver.h>
#include "pmbus.h"
-enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887,
- ltm4676 };
+enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883,
+ ltc3887, ltm4676 };
/* Common for all chips */
#define LTC2978_MFR_VOUT_PEAK 0xdd
@@ -34,12 +33,12 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887,
#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
#define LTC2978_MFR_SPECIAL_ID 0xe7 /* Not on LTC3882 */
-/* LTC2974, LCT2977, and LTC2978 */
+/* LTC2974, LTC2975, LCT2977, and LTC2978 */
#define LTC2978_MFR_VOUT_MIN 0xfb
#define LTC2978_MFR_VIN_MIN 0xfc
#define LTC2978_MFR_TEMPERATURE_MIN 0xfd
-/* LTC2974 only */
+/* LTC2974, LTC2975 */
#define LTC2974_MFR_IOUT_PEAK 0xd7
#define LTC2974_MFR_IOUT_MIN 0xd8
@@ -51,8 +50,15 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887,
/* LTC3883 only */
#define LTC3883_MFR_IIN_PEAK 0xe1
+/* LTC2975 only */
+#define LTC2975_MFR_IIN_PEAK 0xc4
+#define LTC2975_MFR_IIN_MIN 0xc5
+#define LTC2975_MFR_PIN_PEAK 0xc6
+#define LTC2975_MFR_PIN_MIN 0xc7
+
#define LTC2974_ID_REV1 0x0212
#define LTC2974_ID_REV2 0x0213
+#define LTC2975_ID 0x0223
#define LTC2977_ID 0x0130
#define LTC2978_ID_REV1 0x0121
#define LTC2978_ID_REV2 0x0122
@@ -87,7 +93,8 @@ struct ltc2978_data {
u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
- u16 iin_max;
+ u16 iin_min, iin_max;
+ u16 pin_min, pin_max;
u16 temp2_max;
struct pmbus_driver_info info;
};
@@ -246,6 +253,60 @@ static int ltc2974_read_word_data(struct i2c_client *client, int page, int reg)
return ret;
}
+static int ltc2975_read_word_data(struct i2c_client *client, int page, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct ltc2978_data *data = to_ltc2978_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_IIN_MAX:
+ ret = pmbus_read_word_data(client, page, LTC2975_MFR_IIN_PEAK);
+ if (ret >= 0) {
+ if (lin11_to_val(ret)
+ > lin11_to_val(data->iin_max))
+ data->iin_max = ret;
+ ret = data->iin_max;
+ }
+ break;
+ case PMBUS_VIRT_READ_IIN_MIN:
+ ret = pmbus_read_word_data(client, page, LTC2975_MFR_IIN_MIN);
+ if (ret >= 0) {
+ if (lin11_to_val(ret)
+ < lin11_to_val(data->iin_min))
+ data->iin_min = ret;
+ ret = data->iin_min;
+ }
+ break;
+ case PMBUS_VIRT_READ_PIN_MAX:
+ ret = pmbus_read_word_data(client, page, LTC2975_MFR_PIN_PEAK);
+ if (ret >= 0) {
+ if (lin11_to_val(ret)
+ > lin11_to_val(data->pin_max))
+ data->pin_max = ret;
+ ret = data->pin_max;
+ }
+ break;
+ case PMBUS_VIRT_READ_PIN_MIN:
+ ret = pmbus_read_word_data(client, page, LTC2975_MFR_PIN_MIN);
+ if (ret >= 0) {
+ if (lin11_to_val(ret)
+ < lin11_to_val(data->pin_min))
+ data->pin_min = ret;
+ ret = data->pin_min;
+ }
+ break;
+ case PMBUS_VIRT_RESET_IIN_HISTORY:
+ case PMBUS_VIRT_RESET_PIN_HISTORY:
+ ret = 0;
+ break;
+ default:
+ ret = ltc2978_read_word_data(client, page, reg);
+ break;
+ }
+ return ret;
+}
+
static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
@@ -337,7 +398,13 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
switch (reg) {
case PMBUS_VIRT_RESET_IIN_HISTORY:
data->iin_max = 0x7c00;
- ret = ltc2978_clear_peaks(client, page, data->id);
+ data->iin_min = 0x7bff;
+ ret = ltc2978_clear_peaks(client, 0, data->id);
+ break;
+ case PMBUS_VIRT_RESET_PIN_HISTORY:
+ data->pin_max = 0x7c00;
+ data->pin_min = 0x7bff;
+ ret = ltc2978_clear_peaks(client, 0, data->id);
break;
case PMBUS_VIRT_RESET_IOUT_HISTORY:
data->iout_max[page] = 0x7c00;
@@ -372,6 +439,7 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
static const struct i2c_device_id ltc2978_id[] = {
{"ltc2974", ltc2974},
+ {"ltc2975", ltc2975},
{"ltc2977", ltc2977},
{"ltc2978", ltc2978},
{"ltc3880", ltc3880},
@@ -428,6 +496,8 @@ static int ltc2978_get_id(struct i2c_client *client)
if (chip_id == LTC2974_ID_REV1 || chip_id == LTC2974_ID_REV2)
return ltc2974;
+ else if (chip_id == LTC2975_ID)
+ return ltc2975;
else if (chip_id == LTC2977_ID)
return ltc2977;
else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2 ||
@@ -505,6 +575,19 @@ static int ltc2978_probe(struct i2c_client *client,
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
}
break;
+ case ltc2975:
+ info->read_word_data = ltc2975_read_word_data;
+ info->pages = LTC2974_NUM_PAGES;
+ info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
+ | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_TEMP2;
+ for (i = 0; i < info->pages; i++) {
+ info->func[i] |= PMBUS_HAVE_VOUT
+ | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
+ }
+ break;
case ltc2977:
case ltc2978:
info->read_word_data = ltc2978_read_word_data;
@@ -576,6 +659,7 @@ static int ltc2978_probe(struct i2c_client *client,
#ifdef CONFIG_OF
static const struct of_device_id ltc2978_of_match[] = {
{ .compatible = "lltc,ltc2974" },
+ { .compatible = "lltc,ltc2975" },
{ .compatible = "lltc,ltc2977" },
{ .compatible = "lltc,ltc2978" },
{ .compatible = "lltc,ltc3880" },
@@ -601,5 +685,5 @@ static struct i2c_driver ltc2978_driver = {
module_i2c_driver(ltc2978_driver);
MODULE_AUTHOR("Guenter Roeck");
-MODULE_DESCRIPTION("PMBus driver for LTC2974, LTC2978, LTC3880, LTC3883, and LTM4676");
+MODULE_DESCRIPTION("PMBus driver for LTC2978 and comppatible chips");
MODULE_LICENSE("GPL");