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authorMaxim Sloyko <maxims@google.com>2019-04-15 15:28:07 -0700
committerGuenter Roeck <linux@roeck-us.net>2019-04-15 17:19:53 -0700
commit038a9c3d1e42420943c60f879fdb00b62f207f9c (patch)
treed7f5e84bd3bbb79c8038f2ac47f445281415b062 /drivers/hwmon/pmbus
parent991d679951f0df27db170036080746b84115e1e7 (diff)
hwmon: (pmbus/isl68137) Add driver for Intersil ISL68137 PWM Controller
Intersil ISL68137 is a digital output 7-phase configurable PWM controller with an AVSBus interface. Signed-off-by: Maxim Sloyko <maxims@google.com> Signed-off-by: Robert Lippert <rlippert@google.com> Signed-off-by: Patrick Venture <venture@google.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/pmbus')
-rw-r--r--drivers/hwmon/pmbus/Kconfig9
-rw-r--r--drivers/hwmon/pmbus/Makefile1
-rw-r--r--drivers/hwmon/pmbus/isl68137.c169
3 files changed, 179 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index de87abab990e..7edab7e30eaf 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -63,6 +63,15 @@ config SENSORS_IR38064
This driver can also be built as a module. If so, the module will
be called ir38064.
+config SENSORS_ISL68137
+ tristate "Intersil ISL68137"
+ help
+ If you say yes here you get hardware monitoring support for Intersil
+ ISL68137.
+
+ This driver can also be built as a module. If so, the module will
+ be called isl68137.
+
config SENSORS_LM25066
tristate "National Semiconductor LM25066 and compatibles"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 7d1fa6b3c8c9..2219b9300316 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o
obj-$(CONFIG_SENSORS_IR35221) += ir35221.o
obj-$(CONFIG_SENSORS_IR38064) += ir38064.o
+obj-$(CONFIG_SENSORS_ISL68137) += isl68137.o
obj-$(CONFIG_SENSORS_LM25066) += lm25066.o
obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o
obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o
diff --git a/drivers/hwmon/pmbus/isl68137.c b/drivers/hwmon/pmbus/isl68137.c
new file mode 100644
index 000000000000..515596c92fe1
--- /dev/null
+++ b/drivers/hwmon/pmbus/isl68137.c
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for Intersil ISL68137
+ *
+ * Copyright (c) 2017 Google Inc
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include "pmbus.h"
+
+#define ISL68137_VOUT_AVS 0x30
+
+static ssize_t isl68137_avs_enable_show_page(struct i2c_client *client,
+ int page,
+ char *buf)
+{
+ int val = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
+
+ return sprintf(buf, "%d\n",
+ (val & ISL68137_VOUT_AVS) == ISL68137_VOUT_AVS ? 1 : 0);
+}
+
+static ssize_t isl68137_avs_enable_store_page(struct i2c_client *client,
+ int page,
+ const char *buf, size_t count)
+{
+ int rc, op_val;
+ bool result;
+
+ rc = kstrtobool(buf, &result);
+ if (rc)
+ return rc;
+
+ op_val = result ? ISL68137_VOUT_AVS : 0;
+
+ /*
+ * Writes to VOUT setpoint over AVSBus will persist after the VRM is
+ * switched to PMBus control. Switching back to AVSBus control
+ * restores this persisted setpoint rather than re-initializing to
+ * PMBus VOUT_COMMAND. Writing VOUT_COMMAND first over PMBus before
+ * enabling AVS control is the workaround.
+ */
+ if (op_val == ISL68137_VOUT_AVS) {
+ rc = pmbus_read_word_data(client, page, PMBUS_VOUT_COMMAND);
+ if (rc < 0)
+ return rc;
+
+ rc = pmbus_write_word_data(client, page, PMBUS_VOUT_COMMAND,
+ rc);
+ if (rc < 0)
+ return rc;
+ }
+
+ rc = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
+ ISL68137_VOUT_AVS, op_val);
+
+ return (rc < 0) ? rc : count;
+}
+
+static ssize_t isl68137_avs_enable_show(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+
+ return isl68137_avs_enable_show_page(client, attr->index, buf);
+}
+
+static ssize_t isl68137_avs_enable_store(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+
+ return isl68137_avs_enable_store_page(client, attr->index, buf, count);
+}
+
+static SENSOR_DEVICE_ATTR_RW(avs0_enable, isl68137_avs_enable, 0);
+static SENSOR_DEVICE_ATTR_RW(avs1_enable, isl68137_avs_enable, 1);
+
+static struct attribute *enable_attrs[] = {
+ &sensor_dev_attr_avs0_enable.dev_attr.attr,
+ &sensor_dev_attr_avs1_enable.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group enable_group = {
+ .attrs = enable_attrs,
+};
+
+static const struct attribute_group *attribute_groups[] = {
+ &enable_group,
+ NULL,
+};
+
+static struct pmbus_driver_info isl68137_info = {
+ .pages = 2,
+ .format[PSC_VOLTAGE_IN] = direct,
+ .format[PSC_VOLTAGE_OUT] = direct,
+ .format[PSC_CURRENT_IN] = direct,
+ .format[PSC_CURRENT_OUT] = direct,
+ .format[PSC_POWER] = direct,
+ .format[PSC_TEMPERATURE] = direct,
+ .m[PSC_VOLTAGE_IN] = 1,
+ .b[PSC_VOLTAGE_IN] = 0,
+ .R[PSC_VOLTAGE_IN] = 3,
+ .m[PSC_VOLTAGE_OUT] = 1,
+ .b[PSC_VOLTAGE_OUT] = 0,
+ .R[PSC_VOLTAGE_OUT] = 3,
+ .m[PSC_CURRENT_IN] = 1,
+ .b[PSC_CURRENT_IN] = 0,
+ .R[PSC_CURRENT_IN] = 2,
+ .m[PSC_CURRENT_OUT] = 1,
+ .b[PSC_CURRENT_OUT] = 0,
+ .R[PSC_CURRENT_OUT] = 1,
+ .m[PSC_POWER] = 1,
+ .b[PSC_POWER] = 0,
+ .R[PSC_POWER] = 0,
+ .m[PSC_TEMPERATURE] = 1,
+ .b[PSC_TEMPERATURE] = 0,
+ .R[PSC_TEMPERATURE] = 0,
+ .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
+ | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
+ | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
+ | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
+ .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
+ .groups = attribute_groups,
+};
+
+static int isl68137_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ return pmbus_do_probe(client, id, &isl68137_info);
+}
+
+static const struct i2c_device_id isl68137_id[] = {
+ {"isl68137", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, isl68137_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver isl68137_driver = {
+ .driver = {
+ .name = "isl68137",
+ },
+ .probe = isl68137_probe,
+ .remove = pmbus_do_remove,
+ .id_table = isl68137_id,
+};
+
+module_i2c_driver(isl68137_driver);
+
+MODULE_AUTHOR("Maxim Sloyko <maxims@google.com>");
+MODULE_DESCRIPTION("PMBus driver for Intersil ISL68137");
+MODULE_LICENSE("GPL");