diff options
| -rw-r--r-- | Documentation/hwmon/ltc4261 | 63 | ||||
| -rw-r--r-- | MAINTAINERS | 7 | ||||
| -rw-r--r-- | drivers/hwmon/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/hwmon/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hwmon/ltc4261.c | 315 |
5 files changed, 397 insertions, 0 deletions
diff --git a/Documentation/hwmon/ltc4261 b/Documentation/hwmon/ltc4261 new file mode 100644 index 000000000000..eba2e2c4b94d --- /dev/null +++ b/Documentation/hwmon/ltc4261 @@ -0,0 +1,63 @@ +Kernel driver ltc4261 +===================== + +Supported chips: + * Linear Technology LTC4261 + Prefix: 'ltc4261' + Addresses scanned: - + Datasheet: + http://cds.linear.com/docs/Datasheet/42612fb.pdf + +Author: Guenter Roeck <guenter.roeck@ericsson.com> + + +Description +----------- + +The LTC4261/LTC4261-2 negative voltage Hot Swap controllers allow a board +to be safely inserted and removed from a live backplane. + + +Usage Notes +----------- + +This driver does not probe for LTC4261 devices, since there is no register +which can be safely used to identify the chip. You will have to instantiate +the devices explicitly. + +Example: the following will load the driver for an LTC4261 at address 0x10 +on I2C bus #1: +$ modprobe ltc4261 +$ echo ltc4261 0x10 > /sys/bus/i2c/devices/i2c-1/new_device + + +Sysfs entries +------------- + +Voltage readings provided by this driver are reported as obtained from the ADC +registers. If a set of voltage divider resistors is installed, calculate the +real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the +value of the divider resistor against the measured voltage and R2 is the value +of the divider resistor against Ground. + +Current reading provided by this driver is reported as obtained from the ADC +Current Sense register. The reported value assumes that a 1 mOhm sense resistor +is installed. If a different sense resistor is installed, calculate the real +current by dividing the reported value by the sense resistor value in mOhm. + +The chip has two voltage sensors, but only one set of voltage alarm status bits. +In many many designs, those alarms are associated with the ADIN2 sensor, due to +the proximity of the ADIN2 pin to the OV pin. ADIN2 is, however, not available +on all chip variants. To ensure that the alarm condition is reported to the user, +report it with both voltage sensors. + +in1_input ADIN2 voltage (mV) +in1_min_alarm ADIN/ADIN2 Undervoltage alarm +in1_max_alarm ADIN/ADIN2 Overvoltage alarm + +in2_input ADIN voltage (mV) +in2_min_alarm ADIN/ADIN2 Undervoltage alarm +in2_max_alarm ADIN/ADIN2 Overvoltage alarm + +curr1_input SENSE current (mA) +curr1_alarm SENSE overcurrent alarm diff --git a/MAINTAINERS b/MAINTAINERS index 541451050b36..146b8a068a4e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3765,6 +3765,13 @@ L: linux-scsi@vger.kernel.org S: Maintained F: drivers/scsi/sym53c8xx_2/ +LTC4261 HARDWARE MONITOR DRIVER +M: Guenter Roeck <linux@roeck-us.net> +L: lm-sensors@lm-sensors.org +S: Maintained +F: Documentation/hwmon/ltc4261 +F: drivers/hwmon/ltc4261.c + LTP (Linux Test Project) M: Rishikesh K Rajak <risrajak@linux.vnet.ibm.com> M: Garrett Cooper <yanegomi@gmail.com> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index e382da3122b7..ec4295fd22f6 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -654,6 +654,17 @@ config SENSORS_LTC4245 This driver can also be built as a module. If so, the module will be called ltc4245. +config SENSORS_LTC4261 + tristate "Linear Technology LTC4261" + depends on I2C && EXPERIMENTAL + default n + help + If you say yes here you get support for Linear Technology LTC4261 + Negative Voltage Hot Swap Controller I2C interface. + + This driver can also be built as a module. If so, the module will + be called ltc4261. + config SENSORS_LM95241 tristate "National Semiconductor LM95241 sensor chip" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index ec9cb735c898..fc38e7c131f8 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -79,6 +79,7 @@ obj-$(CONFIG_SENSORS_LM93) += lm93.o obj-$(CONFIG_SENSORS_LM95241) += lm95241.o obj-$(CONFIG_SENSORS_LTC4215) += ltc4215.o obj-$(CONFIG_SENSORS_LTC4245) += ltc4245.o +obj-$(CONFIG_SENSORS_LTC4261) += ltc4261.o obj-$(CONFIG_SENSORS_MAX1111) += max1111.o obj-$(CONFIG_SENSORS_MAX1619) += max1619.o obj-$(CONFIG_SENSORS_MAX6650) += max6650.o diff --git a/drivers/hwmon/ltc4261.c b/drivers/hwmon/ltc4261.c new file mode 100644 index 000000000000..267626178678 --- /dev/null +++ b/drivers/hwmon/ltc4261.c @@ -0,0 +1,315 @@ +/* + * Driver for Linear Technology LTC4261 I2C Negative Voltage Hot Swap Controller + * + * Copyright (C) 2010 Ericsson AB. + * + * Derived from: + * + * Driver for Linear Technology LTC4245 I2C Multiple Supply Hot Swap Controller + * Copyright (C) 2008 Ira W. Snyder <iws@ovro.caltech.edu> + * + * Datasheet: http://cds.linear.com/docs/Datasheet/42612fb.pdf + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> + +/* chip registers */ +#define LTC4261_STATUS 0x00 /* readonly */ +#define LTC4261_FAULT 0x01 +#define LTC4261_ALERT 0x02 +#define LTC4261_CONTROL 0x03 +#define LTC4261_SENSE_H 0x04 +#define LTC4261_SENSE_L 0x05 +#define LTC4261_ADIN2_H 0x06 +#define LTC4261_ADIN2_L 0x07 +#define LTC4261_ADIN_H 0x08 +#define LTC4261_ADIN_L 0x09 + +/* + * Fault register bits + */ +#define FAULT_OV (1<<0) +#define FAULT_UV (1<<1) +#define FAULT_OC (1<<2) + +struct ltc4261_data { + struct device *hwmon_dev; + + struct mutex update_lock; + bool valid; + unsigned long last_updated; /* in jiffies */ + + /* Registers */ + u8 regs[10]; +}; + +static struct ltc4261_data *ltc4261_update_device(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct ltc4261_data *data = i2c_get_clientdata(client); + struct ltc4261_data *ret = data; + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ / 4) || !data->valid) { + int i; + + /* Read registers -- 0x00 to 0x09 */ + for (i = 0; i < ARRAY_SIZE(data->regs); i++) { + int val; + + val = i2c_smbus_read_byte_data(client, i); + if (unlikely(val < 0)) { + dev_dbg(dev, + "Failed to read ADC value: error %d", + val); + ret = ERR_PTR(val); + goto abort; + } + data->regs[i] = val; + } + data->last_updated = jiffies; + data->valid = 1; + } +abort: + mutex_unlock(&data->update_lock); + return ret; +} + +/* Return the voltage from the given register in mV or mA */ +static int ltc4261_get_value(struct ltc4261_data *data, u8 reg) +{ + u32 val; + + val = (data->regs[reg] << 2) + (data->regs[reg + 1] >> 6); + + switch (reg) { + case LTC4261_ADIN_H: + case LTC4261_ADIN2_H: + /* 2.5mV resolution. Convert to mV. */ + val = val * 25 / 10; + break; + case LTC4261_SENSE_H: + /* + * 62.5uV resolution. Convert to current as measured with + * an 1 mOhm sense resistor, in mA. If a different sense + * resistor is installed, calculate the actual current by + * dividing the reported current by the sense resistor value + * in mOhm. + */ + val = val * 625 / 10; + break; + default: + /* If we get here, the developer messed up */ + WARN_ON_ONCE(1); + val = 0; + break; + } + + return val; +} + +static ssize_t ltc4261_show_value(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct ltc4261_data *data = ltc4261_update_device(dev); + int value; + + if (IS_ERR(data)) + return PTR_ERR(data); + + value = ltc4261_get_value(data, attr->index); + return snprintf(buf, PAGE_SIZE, "%d\n", value); +} + +static ssize_t ltc4261_show_bool(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct i2c_client *client = to_i2c_client(dev); + struct ltc4261_data *data = ltc4261_update_device(dev); + u8 fault; + + if (IS_ERR(data)) + return PTR_ERR(data); + + fault = data->regs[LTC4261_FAULT] & attr->index; + if (fault) /* Clear reported faults in chip register */ + i2c_smbus_write_byte_data(client, LTC4261_FAULT, ~fault); + + return snprintf(buf, PAGE_SIZE, "%d\n", fault ? 1 : 0); +} + +/* + * These macros are used below in constructing device attribute objects + * for use with sysfs_create_group() to make a sysfs device file + * for each register. + */ + +#define LTC4261_VALUE(name, ltc4261_cmd_idx) \ + static SENSOR_DEVICE_ATTR(name, S_IRUGO, \ + ltc4261_show_value, NULL, ltc4261_cmd_idx) + +#define LTC4261_BOOL(name, mask) \ + static SENSOR_DEVICE_ATTR(name, S_IRUGO, \ + ltc4261_show_bool, NULL, (mask)) + +/* + * Input voltages. + */ +LTC4261_VALUE(in1_input, LTC4261_ADIN_H); +LTC4261_VALUE(in2_input, LTC4261_ADIN2_H); + +/* + * Voltage alarms. The chip has only one set of voltage alarm status bits, + * triggered by input voltage alarms. In many designs, those alarms are + * associated with the ADIN2 sensor, due to the proximity of the ADIN2 pin + * to the OV pin. ADIN2 is, however, not available on all chip variants. + * To ensure that the alarm condition is reported to the user, report it + * with both voltage sensors. + */ +LTC4261_BOOL(in1_min_alarm, FAULT_UV); +LTC4261_BOOL(in1_max_alarm, FAULT_OV); +LTC4261_BOOL(in2_min_alarm, FAULT_UV); +LTC4261_BOOL(in2_max_alarm, FAULT_OV); + +/* Currents (via sense resistor) */ +LTC4261_VALUE(curr1_input, LTC4261_SENSE_H); + +/* Overcurrent alarm */ +LTC4261_BOOL(curr1_max_alarm, FAULT_OC); + +static struct attribute *ltc4261_attributes[] = { + &sensor_dev_attr_in1_input.dev_attr.attr, + &sensor_dev_attr_in1_min_alarm.dev_attr.attr, + &sensor_dev_attr_in1_max_alarm.dev_attr.attr, + &sensor_dev_attr_in2_input.dev_attr.attr, + &sensor_dev_attr_in2_min_alarm.dev_attr.attr, + &sensor_dev_attr_in2_max_alarm.dev_attr.attr, + + &sensor_dev_attr_curr1_input.dev_attr.attr, + &sensor_dev_attr_curr1_max_alarm.dev_attr.attr, + + NULL, +}; + +static const struct attribute_group ltc4261_group = { + .attrs = ltc4261_attributes, +}; + +static int ltc4261_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = client->adapter; + struct ltc4261_data *data; + int ret; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + if (i2c_smbus_read_byte_data(client, LTC4261_STATUS) < 0) { + dev_err(&client->dev, "Failed to read register %d:%02x:%02x\n", + adapter->id, client->addr, LTC4261_STATUS); + return -ENODEV; + } + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) { + ret = -ENOMEM; + goto out_kzalloc; + } + + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + + /* Clear faults */ + i2c_smbus_write_byte_data(client, LTC4261_FAULT, 0x00); + + /* Register sysfs hooks */ + ret = sysfs_create_group(&client->dev.kobj, <c4261_group); + if (ret) + goto out_sysfs_create_group; + + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + ret = PTR_ERR(data->hwmon_dev); + goto out_hwmon_device_register; + } + + return 0; + +out_hwmon_device_register: + sysfs_remove_group(&client->dev.kobj, <c4261_group); +out_sysfs_create_group: + kfree(data); +out_kzalloc: + return ret; +} + +static int ltc4261_remove(struct i2c_client *client) +{ + struct ltc4261_data *data = i2c_get_clientdata(client); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, <c4261_group); + + kfree(data); + + return 0; +} + +static const struct i2c_device_id ltc4261_id[] = { + {"ltc4261", 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, ltc4261_id); + +/* This is the driver that will be inserted */ +static struct i2c_driver ltc4261_driver = { + .driver = { + .name = "ltc4261", + }, + .probe = ltc4261_probe, + .remove = ltc4261_remove, + .id_table = ltc4261_id, +}; + +static int __init ltc4261_init(void) +{ + return i2c_add_driver(<c4261_driver); +} + +static void __exit ltc4261_exit(void) +{ + i2c_del_driver(<c4261_driver); +} + +MODULE_AUTHOR("Guenter Roeck <guenter.roeck@ericsson.com>"); +MODULE_DESCRIPTION("LTC4261 driver"); +MODULE_LICENSE("GPL"); + +module_init(ltc4261_init); +module_exit(ltc4261_exit); |