* [PATCH/RFC v2 1/4] hwmon: PMBus device driver
[not found] ` <1278303018-22069-1-git-send-email-guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
@ 2010-07-05 4:10 ` Guenter Roeck
2010-07-05 4:10 ` [PATCH/RFC v2 2/4] hwmon: i2c PMBus device emulator Guenter Roeck
` (2 subsequent siblings)
3 siblings, 0 replies; 8+ messages in thread
From: Guenter Roeck @ 2010-07-05 4:10 UTC (permalink / raw)
To: Jean Delvare, Jonathan Cameron, Randy Dunlap, Andrew Morton
Cc: lm-sensors-GZX6beZjE8VD60Wz+7aTrA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-i2c-u79uwXL29TY76Z2rM5mHXA, Guenter Roeck
This driver adds support for hardware monitoring features of various PMBus
devices.
Signed-off-by: Guenter Roeck <guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
---
drivers/hwmon/Kconfig | 12 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/pmbus.c | 1396 ++++++++++++++++++++++++++++++++++++++++++++++++
drivers/hwmon/pmbus.h | 209 ++++++++
4 files changed, 1618 insertions(+), 0 deletions(-)
create mode 100644 drivers/hwmon/pmbus.c
create mode 100644 drivers/hwmon/pmbus.h
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index e19cf8e..8d53cf7 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -702,6 +702,18 @@ config SENSORS_PCF8591
These devices are hard to detect and rarely found on mainstream
hardware. If unsure, say N.
+config SENSORS_PMBUS
+ tristate "PMBus devices"
+ depends on I2C && EXPERIMENTAL
+ default n
+ help
+ If you say yes here you get hardware monitoring support for various
+ PMBus devices, including but not limited to BMR45x, LTC2978, MAX16064,
+ MAX8688, and UCD92xx.
+
+ This driver can also be built as a module. If so, the module will
+ be called pmbus.
+
config SENSORS_SHT15
tristate "Sensiron humidity and temperature sensors. SHT15 and compat."
depends on GENERIC_GPIO
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 2138ceb..88b043e 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -83,6 +83,7 @@ obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
+obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
obj-$(CONFIG_SENSORS_S3C) += s3c-hwmon.o
obj-$(CONFIG_SENSORS_SHT15) += sht15.o
obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o
diff --git a/drivers/hwmon/pmbus.c b/drivers/hwmon/pmbus.c
new file mode 100644
index 0000000..549d915
--- /dev/null
+++ b/drivers/hwmon/pmbus.c
@@ -0,0 +1,1396 @@
+/*
+ * Hardware monitoring driver for PMBus devices
+ *
+ * Copyright (C) 2010 Ericsson AB.
+ *
+ * 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>
+#include <linux/delay.h>
+#include "pmbus.h"
+
+/*
+ * Constants needed to determine number of sensors, booleans, and labels.
+ */
+#define PMBUS_MAX_INPUT_SENSORS 11 /* 6*volt, 3*curr, 2*power */
+#define PMBUS_VOUT_SENSORS_PER_PAGE 5 /* input, min, max, lcrit,
+ crit */
+#define PMBUS_IOUT_SENSORS_PER_PAGE 4 /* input, min, max, crit */
+#define PMBUS_POUT_SENSORS_PER_PAGE 4 /* input, cap, max, crit */
+#define PMBUS_MAX_SENSORS_PER_TEMP 5 /* input, min, max, lcrit,
+ crit */
+
+#define PMBUS_MAX_INPUT_BOOLEANS 7 /* v: min_alarm, max_alarm,
+ lcrit_alarm, crit_alarm;
+ c: alarm, crit_alarm;
+ p: crit_alarm */
+#define PMBUS_VOUT_BOOLEANS_PER_PAGE 4 /* min_alarm, max_alarm,
+ lcrit_alarm, crit_alarm */
+#define PMBUS_IOUT_BOOLEANS_PER_PAGE 3 /* alarm, lcrit_alarm,
+ crit_alarm */
+#define PMBUS_POUT_BOOLEANS_PER_PAGE 2 /* alarm, crit_alarm */
+#define PMBUS_MAX_BOOLEANS_PER_TEMP 4 /* min_alarm, max_alarm,
+ lcrit_alarm, crit_alarm */
+
+#define PMBUS_MAX_INPUT_LABELS 4 /* vin, vcap, iin, pin */
+
+#define PMBUS_PAGES 32 /* Per PMBus specification */
+
+enum chips { ltc2978, max16064, max8688, pmbus, ucd9220, ucd9240 };
+
+enum pmbus_sensor_classes {
+ PSC_VOLTAGE = 0,
+ PSC_TEMPERATURE,
+ PSC_CURRENT,
+ PSC_POWER,
+ PSC_NUM_CLASSES /* Number of power sensor classes */
+};
+
+struct pmbus_config {
+ int pages; /* Total number of pages (= output sensors) */
+ bool direct; /* true if device uses direct data format */
+ /*
+ * Support one set of coefficients for each sensor type
+ * Used for chips providing data in direct mode.
+ */
+ int m[PSC_NUM_CLASSES]; /* mantissa for direct data format */
+ int b[PSC_NUM_CLASSES]; /* offset */
+ int R[PSC_NUM_CLASSES]; /* exponent */
+};
+
+#define PB_HAVE_STATUS_VOUT (1<<0)
+#define PB_HAVE_STATUS_IOUT (1<<1)
+#define PB_HAVE_STATUS_INPUT (1<<2)
+#define PB_HAVE_STATUS_TEMP (1<<3)
+
+/*
+ * status, status_vout, status_iout are paged.
+ * status_input and status_temp are unpaged.
+ */
+#define PB_NUM_STATUS_REG (PMBUS_PAGES * 3 + 2)
+
+/*
+ * Index into status register array, per status register group
+ */
+#define PB_STATUS_BASE 0
+#define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
+#define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
+#define PB_STATUS_INPUT_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
+#define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1)
+
+struct pmbus_sensor {
+ char name[I2C_NAME_SIZE]; /* sysfs sensor name */
+ struct sensor_device_attribute attribute;
+ u8 page; /* page number */
+ u8 reg; /* register */
+ enum pmbus_sensor_classes class;/* sensor class */
+ bool update; /* runtime sensor update needed */
+ u16 data; /* Sensor data */
+};
+
+struct pmbus_boolean {
+ char name[I2C_NAME_SIZE]; /* sysfs boolean name */
+ struct sensor_device_attribute attribute;
+};
+
+struct pmbus_label {
+ char name[I2C_NAME_SIZE]; /* sysfs label name */
+ struct sensor_device_attribute attribute;
+ char label[I2C_NAME_SIZE]; /* label */
+};
+
+struct pmbus_data {
+ struct device *hwmon_dev;
+ enum chips type;
+
+ bool direct;
+ int pages;
+
+ /* Coefficients, for chips providing data in direct mode */
+ int m[PSC_NUM_CLASSES]; /* mantissa for direct data format */
+ int b[PSC_NUM_CLASSES]; /* offset */
+ int R[PSC_NUM_CLASSES]; /* exponent */
+
+ int max_attributes;
+ int num_attributes;
+ struct attribute **attributes;
+ struct attribute_group group;
+
+ /*
+ * Sensors cover both sensor and limit registers.
+ */
+ int max_sensors;
+ int num_sensors;
+ struct pmbus_sensor *sensors;
+ /*
+ * Booleans are used for alarms.
+ * Values are determined from status registers.
+ */
+ int max_booleans;
+ int num_booleans;
+ struct pmbus_boolean *booleans;
+ /*
+ * Labels are used to map generic names (e.g., "in1")
+ * to PMBus specific names (e.g., "vin" or "vout1").
+ */
+ int max_labels;
+ int num_labels;
+ struct pmbus_label *labels;
+
+ struct mutex update_lock;
+ bool valid;
+ unsigned long last_updated; /* in jiffies */
+
+ /*
+ * A single status register covers multiple attributes,
+ * so we keep them all together.
+ */
+ u8 status_bits;
+ u8 status[PB_NUM_STATUS_REG];
+
+ u8 currpage;
+};
+
+static const struct pmbus_config pmbus_config[] = {
+ [pmbus] = {
+ .pages = 1,
+ },
+ [ltc2978] = {
+ .pages = 8,
+ },
+ [max16064] = {
+ .pages = 4,
+ .direct = true,
+ .m[PSC_VOLTAGE] = 19995, /* Coefficients from datasheet */
+ .b[PSC_VOLTAGE] = 0,
+ .R[PSC_VOLTAGE] = -1,
+ .m[PSC_TEMPERATURE] = -7612,
+ .b[PSC_TEMPERATURE] = 335,
+ .R[PSC_TEMPERATURE] = -3,
+ },
+ [max8688] = {
+ .pages = 1,
+ .direct = true,
+ .m[PSC_VOLTAGE] = 19995, /* Coefficients from datasheet */
+ .b[PSC_VOLTAGE] = 0,
+ .R[PSC_VOLTAGE] = -1,
+ .m[PSC_TEMPERATURE] = -7612,
+ .b[PSC_TEMPERATURE] = 335,
+ .R[PSC_TEMPERATURE] = -3,
+ .m[PSC_CURRENT] = 23109,
+ .b[PSC_CURRENT] = 0,
+ .R[PSC_CURRENT] = -2,
+ },
+ [ucd9220] = {
+ .pages = 2,
+ },
+ [ucd9240] = {
+ .pages = 4,
+ },
+};
+
+static int pmbus_set_page(struct i2c_client *client, u8 page)
+{
+ struct pmbus_data *data = i2c_get_clientdata(client);
+ int rv = 0;
+
+ if (page != data->currpage) {
+ rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
+ data->currpage = page;
+ }
+ return rv;
+}
+
+static int pmbus_write_byte(struct i2c_client *client, u8 page, u8 value)
+{
+ int rv;
+
+ rv = pmbus_set_page(client, page);
+ if (rv < 0)
+ return rv;
+
+ return i2c_smbus_write_byte(client, value);
+}
+
+static int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg,
+ u16 word)
+{
+ int rv;
+
+ rv = pmbus_set_page(client, page);
+ if (rv < 0)
+ return rv;
+
+ return i2c_smbus_write_word_data(client, reg, word);
+}
+
+static int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
+{
+ int rv;
+
+ rv = pmbus_set_page(client, page);
+ if (rv < 0)
+ return rv;
+
+ return i2c_smbus_read_word_data(client, reg);
+}
+
+static int pmbus_read_byte_data(struct i2c_client *client, u8 page, u8 reg)
+{
+ int rv;
+
+ rv = pmbus_set_page(client, page);
+ if (rv < 0)
+ return rv;
+
+ return i2c_smbus_read_byte_data(client, reg);
+}
+
+static void pmbus_clear_faults(struct i2c_client *client)
+{
+ struct pmbus_data *data = i2c_get_clientdata(client);
+ int i;
+
+ for (i = 0; i < data->pages; i++)
+ pmbus_write_byte(client, i, PMBUS_CLEAR_FAULTS);
+}
+
+static bool pmbus_check_byte_register(struct i2c_client *client, int page,
+ int reg)
+{
+ return (pmbus_read_byte_data(client, page, reg) >= 0);
+}
+
+static bool pmbus_check_word_register(struct i2c_client *client, int page,
+ int reg)
+{
+ return (pmbus_read_word_data(client, page, reg) >= 0);
+}
+
+static struct pmbus_data *pmbus_update_device(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct pmbus_data *data = i2c_get_clientdata(client);
+ struct pmbus_data *ret = data;
+
+ mutex_lock(&data->update_lock);
+ if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+ int i, val;
+
+ for (i = 0; i < data->pages; i++) {
+ val = pmbus_read_byte_data(client, i,
+ PMBUS_STATUS_BYTE);
+ if (val < 0) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->status[PB_STATUS_BASE + i] = val;
+ }
+ if (data->status_bits & PB_HAVE_STATUS_VOUT)
+ for (i = 0; i < data->pages; i++) {
+ val = pmbus_read_byte_data(client, i,
+ PMBUS_STATUS_VOUT);
+ if (val < 0) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->status[PB_STATUS_VOUT_BASE + i] = val;
+ }
+ if (data->status_bits & PB_HAVE_STATUS_IOUT)
+ for (i = 0; i < data->pages; i++) {
+ val = pmbus_read_byte_data(client, i,
+ PMBUS_STATUS_IOUT);
+ if (val < 0) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->status[PB_STATUS_IOUT_BASE + i] = val;
+ }
+ if (data->status_bits & PB_HAVE_STATUS_INPUT) {
+ val = pmbus_read_byte_data(client, 0,
+ PMBUS_STATUS_INPUT);
+ if (val < 0) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->status[PB_STATUS_INPUT_BASE] = val;
+ }
+ if (data->status_bits & PB_HAVE_STATUS_TEMP) {
+ val = pmbus_read_byte_data(client, 0,
+ PMBUS_STATUS_TEMPERATURE);
+ if (val < 0) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->status[PB_STATUS_TEMP_BASE] = val;
+ }
+ for (i = 0; i < data->num_sensors; i++) {
+ struct pmbus_sensor *sensor = &data->sensors[i];
+
+ if (!data->valid || sensor->update) {
+ val = pmbus_read_word_data(client, sensor->page,
+ sensor->reg);
+ if (val < 0) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ sensor->data = val;
+ }
+ }
+ pmbus_clear_faults(client);
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+abort:
+ mutex_unlock(&data->update_lock);
+ return ret;
+}
+
+/*
+ * Convert linear sensor values to milli- or micro-units
+ * depending on sensor type.
+ */
+static long pmbus_reg2data_linear(struct pmbus_data *data,
+ struct pmbus_sensor *sensor)
+{
+ s16 exponent, mantissa;
+ long val;
+
+ exponent = sensor->data >> 11;
+ mantissa = sensor->data & 0x07ff;
+
+ if (exponent > 0x0f)
+ exponent |= 0xffe0; /* sign extend exponent */
+ if (mantissa > 0x03ff)
+ mantissa |= 0xf800; /* sign extend mantissa */
+
+ /* scale result to milli-units */
+ val = mantissa * 1000L;
+
+ /* scale result to micro-units for power sensors */
+ if (sensor->class == PSC_POWER)
+ val = val * 1000L;
+
+ if (exponent >= 0)
+ val <<= exponent;
+ else
+ val >>= -exponent;
+
+ return val;
+}
+
+/*
+ * Convert direct sensor values to milli- or micro-units
+ * depending on sensor type.
+ */
+static long pmbus_reg2data_direct(struct pmbus_data *data,
+ struct pmbus_sensor *sensor)
+{
+ long val = (s16) sensor->data;
+ long m, b, R;
+
+ m = data->m[sensor->class];
+ b = data->b[sensor->class];
+ R = data->R[sensor->class];
+
+ if (m == 0)
+ return 0;
+
+ /* X = 1/m * (Y * 10^-R - b) */
+ R = -R + 3; /* scale result to milli-units */
+ b *= 1000; /* subtract milli-units */
+
+ /* scale result to micro-units for power sensors */
+ if (sensor->class == PSC_POWER) {
+ R += 3;
+ b *= 1000;
+ }
+
+ while (R > 0) {
+ val *= 10;
+ R--;
+ }
+ while (R < 0) {
+ val = DIV_ROUND_CLOSEST(val, 10);
+ R++;
+ }
+
+ return (val - b) / m;
+}
+
+static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
+{
+ long val;
+
+ if (data->direct)
+ val = pmbus_reg2data_direct(data, sensor);
+ else
+ val = pmbus_reg2data_linear(data, sensor);
+
+ return val;
+}
+
+#define MAX_MANTISSA (1023 * 1000)
+#define MIN_MANTISSA (511 * 1000)
+
+static u16 pmbus_data2reg_linear(struct pmbus_data *data,
+ enum pmbus_sensor_classes class, long val)
+{
+ s16 exponent = 0, mantissa = 0;
+ bool negative = false;
+
+ /* simple case */
+ if (val == 0)
+ return 0;
+
+ if (val < 0) {
+ negative = true;
+ val = -val;
+ }
+
+ /* Power is in uW. Convert to mW before converting. */
+ if (class == PSC_POWER)
+ val = DIV_ROUND_CLOSEST(val, 1000L);
+
+ /* Reduce large mantissa until it fits into 10 bit */
+ while (val >= MAX_MANTISSA && exponent < 15) {
+ exponent++;
+ val >>= 1;
+ }
+ /* Increase small mantissa to improve precision */
+ while (val < MIN_MANTISSA && exponent > -15) {
+ exponent--;
+ val <<= 1;
+ }
+
+ /* Convert mantissa from milli-units to units */
+ mantissa = DIV_ROUND_CLOSEST(val, 1000);
+
+ /* Ensure that resulting number is within range */
+ if (mantissa > 0x3ff)
+ mantissa = 0x3ff;
+
+ /* restore sign */
+ if (negative)
+ mantissa = -mantissa;
+
+ /* Convert to 5 bit exponent, 11 bit mantissa */
+ return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
+}
+
+static u16 pmbus_data2reg_direct(struct pmbus_data *data,
+ enum pmbus_sensor_classes class, long val)
+{
+ long m, b, R;
+
+ m = data->m[class];
+ b = data->b[class];
+ R = data->R[class];
+
+ /* Power is in uW. Adjust R. */
+ if (class == PSC_POWER)
+ R -= 3;
+
+ /* Calculate Y = (m * X + b) * 10^R */
+ R -= 3; /* Adjust R for data in milli-units */
+ val *= m;
+ val += b * 1000;
+
+ while (R > 0) {
+ val *= 10;
+ R--;
+ }
+ while (R < 0) {
+ val = DIV_ROUND_CLOSEST(val, 10);
+ R++;
+ }
+
+ return val;
+}
+
+static u16 pmbus_data2reg(struct pmbus_data *data,
+ enum pmbus_sensor_classes class, long val)
+{
+ u16 regval;
+
+ if (data->direct)
+ regval = pmbus_data2reg_direct(data, class, val);
+ else
+ regval = pmbus_data2reg_linear(data, class, val);
+
+ return regval;
+}
+
+/* Return converted value from given object */
+static long pmbus_get_sensor(struct pmbus_data *data, int index)
+{
+ return pmbus_reg2data(data, &data->sensors[index]);
+}
+
+/*
+ * Return boolean calculated from converted data.
+ * <index> defines a status register index and mask, and optionally
+ * two sensor indexes.
+ * The upper half-word references the two sensors,
+ * the lower half word references status register and mask.
+ * The function returns true if (status[reg] & mask) is true and,
+ * if specified, if v1 >= v2.
+ * To determine if an object exceeds upper limits, specify <v, limit>.
+ * To determine if an object exceeds lower limits, specify <limit, v>.
+ */
+static long pmbus_get_boolean(struct pmbus_data *data, int index)
+{
+ u8 s1 = (index >> 24) & 0xff;
+ u8 s2 = (index >> 16) & 0xff;
+ u8 reg = (index >> 8) & 0xff;
+ u8 mask = index & 0xff;
+ int rv = 0;
+ u8 regval = data->status[reg] & mask;
+
+ if (!s1 && !s2)
+ rv = !!regval;
+ else {
+ int v1, v2;
+
+ v1 = pmbus_reg2data(data, &data->sensors[s1]);
+ v2 = pmbus_reg2data(data, &data->sensors[s2]);
+ rv = !!(regval && v1 >= v2);
+ }
+ return rv;
+}
+
+#define PMBUS_SHOW_INT(what) \
+ static ssize_t pmbus_show_##what(struct device *dev, \
+ struct device_attribute *da, \
+ char *buf) \
+{ \
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
+ struct pmbus_data *data = pmbus_update_device(dev); \
+ long val; \
+ if (IS_ERR(data)) \
+ return PTR_ERR(data); \
+ val = pmbus_get_##what(data, attr->index); \
+ return snprintf(buf, PAGE_SIZE, "%ld\n", val); \
+}
+
+PMBUS_SHOW_INT(sensor);
+PMBUS_SHOW_INT(boolean);
+
+static ssize_t pmbus_set_sensor(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct i2c_client *client = to_i2c_client(dev);
+ struct pmbus_data *data = i2c_get_clientdata(client);
+ struct pmbus_sensor *sensor = &data->sensors[attr->index];
+ ssize_t rv = count;
+ long val = 0;
+ int ret;
+ u16 regval;
+
+ if (strict_strtol(buf, 10, &val) < 0)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ regval = pmbus_data2reg(data, sensor->class, val);
+ ret = pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
+ if (ret < 0)
+ rv = ret;
+ else
+ data->sensors[attr->index].data = regval;
+ mutex_unlock(&data->update_lock);
+ return rv;
+}
+
+static ssize_t pmbus_show_label(struct device *dev,
+ struct device_attribute *da,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct pmbus_data *data = i2c_get_clientdata(client);
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ data->labels[attr->index].label);
+}
+
+#define PMBUS_ADD_ATTR(data, _name, _idx, _mode, _type, _show, _set) \
+do { \
+ struct sensor_device_attribute *a \
+ = &data->_type##s[data->num_##_type##s].attribute; \
+ BUG_ON(data->num_attributes >= data->max_attributes); \
+ a->dev_attr.attr.name = _name; \
+ a->dev_attr.attr.mode = _mode; \
+ a->dev_attr.show = _show; \
+ a->dev_attr.store = _set; \
+ a->index = _idx; \
+ data->attributes[data->num_attributes] = &a->dev_attr.attr; \
+ data->num_attributes++; \
+} while (0)
+
+#define PMBUS_ADD_GET_ATTR(data, _name, _type, _idx) \
+ PMBUS_ADD_ATTR(data, _name, _idx, S_IRUGO, _type, \
+ pmbus_show_##_type, NULL)
+
+#define PMBUS_ADD_SET_ATTR(data, _name, _type, _idx) \
+ PMBUS_ADD_ATTR(data, _name, _idx, S_IWUSR | S_IRUGO, _type, \
+ pmbus_show_##_type, pmbus_set_##_type)
+
+static void pmbus_add_boolean(struct pmbus_data *data,
+ const char *name, const char *type, int seq,
+ int val)
+{
+ struct pmbus_boolean *boolean;
+
+ BUG_ON(data->num_booleans >= data->max_booleans);
+
+ boolean = &data->booleans[data->num_booleans];
+
+ snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
+ name, seq, type);
+ PMBUS_ADD_GET_ATTR(data, boolean->name, boolean, val);
+ data->num_booleans++;
+}
+
+static void pmbus_add_boolean_reg(struct pmbus_data *data,
+ const char *name, const char *type,
+ int seq, int reg, int bit)
+{
+ pmbus_add_boolean(data, name, type, seq,
+ (reg << 8) | bit);
+}
+
+static void pmbus_add_boolean_cmp(struct pmbus_data *data,
+ const char *name, const char *type,
+ int seq, int i1, int i2, int reg,
+ int mask)
+{
+ pmbus_add_boolean(data, name, type, seq,
+ (i1 << 24) | (i2 << 16) | (reg << 8) | mask);
+}
+
+static void pmbus_add_sensor(struct pmbus_data *data,
+ const char *name, const char *type, int seq,
+ int page, int reg, enum pmbus_sensor_classes class,
+ bool update)
+{
+ struct pmbus_sensor *sensor;
+
+ BUG_ON(data->num_sensors >= data->max_sensors);
+
+ sensor = &data->sensors[data->num_sensors];
+ snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
+ name, seq, type);
+ sensor->page = page;
+ sensor->reg = reg;
+ sensor->class = class;
+ sensor->update = update;
+ if (update)
+ PMBUS_ADD_GET_ATTR(data, sensor->name, sensor,
+ data->num_sensors);
+ else
+ PMBUS_ADD_SET_ATTR(data, sensor->name, sensor,
+ data->num_sensors);
+ data->num_sensors++;
+}
+
+static void pmbus_add_label(struct pmbus_data *data,
+ const char *name, int seq,
+ const char *lstring, int index)
+{
+ struct pmbus_label *label;
+
+ BUG_ON(data->num_labels >= data->max_labels);
+
+ label = &data->labels[data->num_labels];
+ snprintf(label->name, sizeof(label->name), "%s%d_label",
+ name, seq);
+ if (!index)
+ strncpy(label->label, lstring, sizeof(label->label) - 1);
+ else
+ snprintf(label->label, sizeof(label->label), "%s%d", lstring,
+ index);
+
+ PMBUS_ADD_GET_ATTR(data, label->name, label, data->num_labels);
+ data->num_labels++;
+}
+
+/*
+ * Identify important chip parameters.
+ */
+static void pmbus_identify_generic(struct i2c_client *client,
+ struct pmbus_data *data)
+{
+ /*
+ * Check if the PAGE command is supported. If it is,
+ * keep setting the page number until it fails or until the
+ * maximum number of pages has been reached. Assume that
+ * this is the number of pages supported by the chip.
+ */
+ if (pmbus_check_byte_register(client, 0, PMBUS_PAGE)) {
+ int page;
+
+ for (page = 1; page < PMBUS_PAGES; page++) {
+ if (pmbus_set_page(client, page) < 0)
+ break;
+ }
+ pmbus_set_page(client, 0);
+ data->pages = page;
+ } else
+ data->pages = 1;
+
+ /*
+ * We should check if the COEFFICIENTS register is supported.
+ * If it is, select direct mode and read the coefficients from the
+ * chip, one set per group of sensor registers.
+ *
+ * To do this, we will need access to a chip which actually supports the
+ * COEFFICIENTS command, since the command is too complex to implement
+ * without testing it.
+ */
+}
+
+static int pmbus_temp_sensors[] = {
+ PMBUS_READ_TEMPERATURE_1,
+ PMBUS_READ_TEMPERATURE_2,
+ PMBUS_READ_TEMPERATURE_3
+};
+
+/*
+ * Determine maximum number of sensors, booleans, and labels.
+ * To keep things simple, only make a rough high estimate.
+ */
+static void pmbus_find_max_attr(struct i2c_client *client,
+ struct pmbus_data *data)
+{
+ int i, max_sensors, max_booleans, max_labels;
+
+ max_sensors = PMBUS_MAX_INPUT_SENSORS;
+ max_booleans = PMBUS_MAX_INPUT_BOOLEANS;
+ max_labels = PMBUS_MAX_INPUT_LABELS;
+
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_VOUT)) {
+ max_sensors += data->pages * PMBUS_VOUT_SENSORS_PER_PAGE;
+ max_booleans += data->pages * PMBUS_VOUT_BOOLEANS_PER_PAGE;
+ max_labels += data->pages;
+ }
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_IOUT)) {
+ max_sensors += data->pages * PMBUS_IOUT_SENSORS_PER_PAGE;
+ max_booleans += data->pages * PMBUS_IOUT_BOOLEANS_PER_PAGE;
+ max_labels += data->pages;
+ }
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_POUT)) {
+ max_sensors += data->pages * PMBUS_POUT_SENSORS_PER_PAGE;
+ max_booleans += data->pages * PMBUS_POUT_BOOLEANS_PER_PAGE;
+ max_labels += data->pages;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(pmbus_temp_sensors); i++) {
+ if (!pmbus_check_word_register(client, 0,
+ pmbus_temp_sensors[i]))
+ break;
+ max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
+ max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
+ }
+ data->max_sensors = max_sensors;
+ data->max_booleans = max_booleans;
+ data->max_labels = max_labels;
+ data->max_attributes = max_sensors + max_booleans + max_labels;
+}
+
+/*
+ * Search for attributes. Allocate sensors, booleans, and labels as needed.
+ */
+static void pmbus_find_attributes(struct i2c_client *client,
+ struct pmbus_data *data)
+{
+ int i, i0, i1, in_index;
+
+ /*
+ * Input voltage sensors
+ */
+ in_index = 1;
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN)) {
+ i0 = data->num_sensors;
+ pmbus_add_label(data, "in", in_index, "vin", 0);
+ pmbus_add_sensor(data, "in", "input", in_index,
+ 0, PMBUS_READ_VIN, PSC_VOLTAGE, true);
+ if (pmbus_check_word_register(client, 0,
+ PMBUS_VIN_UV_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "min", in_index,
+ 0, PMBUS_VIN_UV_WARN_LIMIT,
+ PSC_VOLTAGE, false);
+ if (data->status_bits & PB_HAVE_STATUS_INPUT)
+ pmbus_add_boolean_reg(data, "in", "min_alarm",
+ in_index,
+ PB_STATUS_INPUT_BASE,
+ PB_VOLTAGE_UV_WARNING);
+ }
+ if (pmbus_check_word_register(client, 0,
+ PMBUS_VIN_UV_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "lcrit", in_index,
+ 0, PMBUS_VIN_UV_FAULT_LIMIT,
+ PSC_VOLTAGE, false);
+ if (data->status_bits & PB_HAVE_STATUS_INPUT)
+ pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
+ in_index,
+ PB_STATUS_INPUT_BASE,
+ PB_VOLTAGE_UV_FAULT);
+ }
+ if (pmbus_check_word_register(client, 0,
+ PMBUS_VIN_OV_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "max", in_index,
+ 0, PMBUS_VIN_OV_WARN_LIMIT,
+ PSC_VOLTAGE, false);
+ if (data->status_bits & PB_HAVE_STATUS_INPUT)
+ pmbus_add_boolean_reg(data, "in", "max_alarm",
+ in_index,
+ PB_STATUS_INPUT_BASE,
+ PB_VOLTAGE_OV_WARNING);
+ }
+ if (pmbus_check_word_register(client, 0,
+ PMBUS_VIN_OV_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "crit", in_index,
+ 0, PMBUS_VIN_OV_FAULT_LIMIT,
+ PSC_VOLTAGE, false);
+ if (data->status_bits & PB_HAVE_STATUS_INPUT)
+ pmbus_add_boolean_reg(data, "in", "crit_alarm",
+ in_index,
+ PB_STATUS_INPUT_BASE,
+ PB_VOLTAGE_OV_FAULT);
+ }
+ in_index++;
+ }
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP)) {
+ pmbus_add_label(data, "in", in_index, "vcap", 0);
+ pmbus_add_sensor(data, "in", "input", in_index, 0,
+ PMBUS_READ_VCAP, PSC_VOLTAGE, true);
+ in_index++;
+ }
+
+ /*
+ * Output voltage sensors
+ */
+ for (i = 0; i < data->pages; i++) {
+ if (!pmbus_check_word_register(client, i, PMBUS_READ_VOUT))
+ break;
+
+ i0 = data->num_sensors;
+ pmbus_add_label(data, "in", in_index, "vout", i+1);
+ pmbus_add_sensor(data, "in", "input", in_index, i,
+ PMBUS_READ_VOUT, PSC_VOLTAGE, true);
+ if (pmbus_check_word_register(client, i,
+ PMBUS_VOUT_UV_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "min", in_index, i,
+ PMBUS_VOUT_UV_WARN_LIMIT, PSC_VOLTAGE,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_VOUT)
+ pmbus_add_boolean_reg(data, "in", "min_alarm",
+ in_index,
+ PB_STATUS_VOUT_BASE + i,
+ PB_VOLTAGE_UV_WARNING);
+ }
+ if (pmbus_check_word_register(client, i,
+ PMBUS_VOUT_UV_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "lcrit", in_index, i,
+ PMBUS_VOUT_UV_FAULT_LIMIT, PSC_VOLTAGE,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_VOUT)
+ pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
+ in_index,
+ PB_STATUS_VOUT_BASE + i,
+ PB_VOLTAGE_UV_FAULT);
+ }
+ if (pmbus_check_word_register(client, i,
+ PMBUS_VOUT_OV_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "max", in_index, i,
+ PMBUS_VOUT_OV_WARN_LIMIT, PSC_VOLTAGE,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_VOUT) {
+ pmbus_add_boolean_reg(data, "in", "max_alarm",
+ in_index,
+ PB_STATUS_VOUT_BASE + i,
+ PB_VOLTAGE_OV_WARNING);
+ }
+ }
+ if (pmbus_check_word_register(client, i,
+ PMBUS_VOUT_OV_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "crit", in_index, i,
+ PMBUS_VOUT_OV_FAULT_LIMIT, PSC_VOLTAGE,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_VOUT)
+ pmbus_add_boolean_reg(data, "in", "crit_alarm",
+ in_index,
+ PB_STATUS_VOUT_BASE + i,
+ PB_VOLTAGE_OV_FAULT);
+ }
+ in_index++;
+ }
+
+ /*
+ * Current sensors
+ */
+
+ /*
+ * Input current sensors
+ */
+ in_index = 1;
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN)) {
+ i0 = data->num_sensors;
+ pmbus_add_label(data, "curr", in_index, "iin", 0);
+ pmbus_add_sensor(data, "curr", "input", in_index,
+ 0, PMBUS_READ_IIN, PSC_CURRENT, true);
+ if (pmbus_check_word_register(client, 0,
+ PMBUS_IIN_OC_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "curr", "max", in_index,
+ 0, PMBUS_IIN_OC_WARN_LIMIT,
+ PSC_CURRENT, false);
+ if (data->status_bits & PB_HAVE_STATUS_INPUT) {
+ pmbus_add_boolean_reg(data, "curr", "alarm",
+ in_index,
+ PB_STATUS_INPUT_BASE,
+ PB_IIN_OC_WARNING);
+ }
+ }
+ if (pmbus_check_word_register(client, 0,
+ PMBUS_IIN_OC_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "curr", "crit", in_index,
+ 0, PMBUS_IIN_OC_FAULT_LIMIT,
+ PSC_CURRENT, false);
+ if (data->status_bits & PB_HAVE_STATUS_INPUT) {
+ pmbus_add_boolean_reg(data, "curr",
+ "crit_alarm",
+ in_index,
+ PB_STATUS_INPUT_BASE,
+ PB_IIN_OC_FAULT);
+ }
+ }
+ in_index++;
+ }
+
+ /*
+ * Output Current sensors
+ */
+ for (i = 0; i < data->pages; i++) {
+ if (!pmbus_check_word_register(client, i, PMBUS_READ_IOUT))
+ break;
+
+ i0 = data->num_sensors;
+ pmbus_add_label(data, "curr", in_index, "iout", i+1);
+ pmbus_add_sensor(data, "curr", "input", in_index, i,
+ PMBUS_READ_IOUT, PSC_CURRENT, true);
+ if (pmbus_check_word_register(client, i,
+ PMBUS_IOUT_OC_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "curr", "max", in_index, i,
+ PMBUS_IOUT_OC_WARN_LIMIT, PSC_CURRENT,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_IOUT)
+ pmbus_add_boolean_reg(data, "curr", "alarm",
+ in_index,
+ PB_STATUS_IOUT_BASE + i,
+ PB_IOUT_OC_WARNING);
+ }
+ if (pmbus_check_word_register(client, i,
+ PMBUS_IOUT_UC_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "curr", "lcrit", in_index, i,
+ PMBUS_IOUT_UC_FAULT_LIMIT, PSC_CURRENT,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_IOUT)
+ pmbus_add_boolean_reg(data, "curr",
+ "lcrit_alarm",
+ in_index,
+ PB_STATUS_IOUT_BASE + i,
+ PB_IOUT_UC_FAULT);
+ }
+ if (pmbus_check_word_register(client, i,
+ PMBUS_IOUT_OC_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "curr", "crit", in_index, i,
+ PMBUS_IOUT_OC_FAULT_LIMIT, PSC_CURRENT,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_IOUT)
+ pmbus_add_boolean_reg(data, "curr",
+ "crit_alarm",
+ in_index,
+ PB_STATUS_IOUT_BASE + i,
+ PB_IOUT_OC_FAULT);
+ }
+ in_index++;
+ }
+
+ /*
+ * Power sensors
+ */
+ /*
+ * Input Power sensors
+ */
+ in_index = 1;
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN)) {
+ i0 = data->num_sensors;
+ pmbus_add_label(data, "power", in_index, "pin", 0);
+ pmbus_add_sensor(data, "power", "input", in_index,
+ 0, PMBUS_READ_PIN, PSC_POWER, true);
+ if (pmbus_check_word_register(client, 0,
+ PMBUS_PIN_OP_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "power", "max", in_index,
+ 0, PMBUS_PIN_OP_WARN_LIMIT, PSC_POWER,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_INPUT)
+ pmbus_add_boolean_reg(data, "power", "alarm",
+ in_index,
+ PB_STATUS_INPUT_BASE,
+ PB_PIN_OP_WARNING);
+ }
+ in_index++;
+ }
+
+ /*
+ * Output Power sensors
+ */
+ for (i = 0; i < data->pages; i++) {
+ bool need_alarm = false;
+
+ if (!pmbus_check_word_register(client, i, PMBUS_READ_POUT))
+ break;
+
+ i0 = data->num_sensors;
+ pmbus_add_label(data, "power", in_index, "pout", i+1);
+ pmbus_add_sensor(data, "power", "input", in_index, i,
+ PMBUS_READ_POUT, PSC_POWER, true);
+ /*
+ * Per hwmon sysfs API, power_cap is to be used to limit output
+ * power.
+ * We have two registers related to maximum output power,
+ * PMBUS_POUT_MAX and PMBUS_POUT_OP_WARN_LIMIT.
+ * PMBUS_POUT_MAX matches the powerX_cap attribute definition.
+ * There is no attribute in the API to match
+ * PMBUS_POUT_OP_WARN_LIMIT. We use powerX_max for now.
+ */
+ if (pmbus_check_word_register(client, i, PMBUS_POUT_MAX)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "power", "cap", in_index, i,
+ PMBUS_POUT_MAX, PSC_POWER, false);
+ need_alarm = true;
+ }
+ if (pmbus_check_word_register(client, i,
+ PMBUS_POUT_OP_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "power", "max", in_index, i,
+ PMBUS_POUT_OP_WARN_LIMIT, PSC_POWER,
+ false);
+ need_alarm = true;
+ }
+ if (need_alarm && (data->status_bits & PB_HAVE_STATUS_IOUT))
+ pmbus_add_boolean_reg(data, "power", "alarm",
+ in_index,
+ PB_STATUS_IOUT_BASE,
+ PB_POUT_OP_WARNING
+ | PB_POWER_LIMITING);
+
+ if (pmbus_check_word_register(client, i,
+ PMBUS_POUT_OP_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "power", "crit", in_index, i,
+ PMBUS_POUT_OP_FAULT_LIMIT, PSC_POWER,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_IOUT)
+ pmbus_add_boolean_reg(data, "power",
+ "crit_alarm",
+ in_index,
+ PB_STATUS_IOUT_BASE,
+ PB_POUT_OP_FAULT);
+ }
+ in_index++;
+ }
+
+ /*
+ * Temperature sensors
+ */
+ in_index = 1;
+ for (i = 0; i < ARRAY_SIZE(pmbus_temp_sensors); i++) {
+ if (!pmbus_check_word_register(client, 0,
+ pmbus_temp_sensors[i]))
+ break;
+
+ i0 = data->num_sensors;
+ pmbus_add_sensor(data, "temp", "input", in_index, 0,
+ pmbus_temp_sensors[i], PSC_TEMPERATURE, true);
+
+ /*
+ * PMBus provides only one status register for all temperature
+ * sensors. Thus, we can not use the status register to
+ * determine which of the sensors actually caused an alarm.
+ * Always compare current temperature against the limit
+ * registers to determine alarm conditions for a specific
+ * sensor.
+ */
+ if (pmbus_check_word_register(client, 0, PMBUS_UT_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "temp", "min", in_index, 0,
+ PMBUS_UT_WARN_LIMIT, PSC_TEMPERATURE,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_TEMP)
+ pmbus_add_boolean_cmp(data, "temp", "min_alarm",
+ in_index, i1, i0,
+ PB_STATUS_TEMP_BASE,
+ PB_TEMP_UT_WARNING);
+ }
+ if (pmbus_check_word_register(client, 0,
+ PMBUS_UT_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "temp", "lcrit", in_index, 0,
+ PMBUS_UT_FAULT_LIMIT, PSC_TEMPERATURE,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_TEMP)
+ pmbus_add_boolean_cmp(data, "temp", "lcrit",
+ in_index, i1, i0,
+ PB_STATUS_TEMP_BASE,
+ PB_TEMP_UT_FAULT);
+ }
+ if (pmbus_check_word_register(client, 0, PMBUS_OT_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "temp", "max", in_index, 0,
+ PMBUS_OT_WARN_LIMIT, PSC_TEMPERATURE,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_TEMP)
+ pmbus_add_boolean_cmp(data, "temp", "max_alarm",
+ in_index, i0, i1,
+ PB_STATUS_TEMP_BASE,
+ PB_TEMP_OT_WARNING);
+ }
+ if (pmbus_check_word_register(client, 0,
+ PMBUS_OT_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "temp", "crit", in_index, 0,
+ PMBUS_OT_FAULT_LIMIT, PSC_TEMPERATURE,
+ false);
+ if (data->status_bits & PB_HAVE_STATUS_TEMP)
+ pmbus_add_boolean_cmp(data, "temp",
+ "crit_alarm",
+ in_index, i0, i1,
+ PB_STATUS_TEMP_BASE,
+ PB_TEMP_OT_FAULT);
+ }
+ in_index++;
+ }
+
+ pmbus_clear_faults(client);
+}
+
+static int pmbus_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct pmbus_data *data;
+ int i, ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA
+ | I2C_FUNC_SMBUS_WORD_DATA))
+ return -ENODEV;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
+
+ data->type = id->driver_data;
+ data->direct = pmbus_config[data->type].direct;
+ data->pages = pmbus_config[data->type].pages;
+
+ /*
+ * Bail out if status register or PMBus revision register
+ * does not exist.
+ */
+ if (!pmbus_check_byte_register(client, 0, PMBUS_STATUS_BYTE)
+ || !pmbus_check_byte_register(client, 0, PMBUS_REVISION)) {
+ ret = -ENODEV;
+ goto out_data;
+ }
+
+ if (data->type == pmbus) {
+ pmbus_identify_generic(client, data);
+ } else {
+ /*
+ * Bail out if more than one page was configured, but we can not
+ * select the highest page. This is an indication that the wrong
+ * chip type was selected. Better bail out now than keep
+ * returning errors later on.
+ */
+ if (data->pages > 1 && pmbus_set_page(client,
+ data->pages-1) < 0) {
+ dev_err(&client->dev, "Failed to select page %d",
+ data->pages-1);
+ ret = -EINVAL;
+ goto out_data;
+ }
+ if (data->direct)
+ for (i = 0; i < PSC_NUM_CLASSES; i++) {
+ data->m[i] = pmbus_config[data->type].m[i];
+ data->b[i] = pmbus_config[data->type].b[i];
+ data->R[i] = pmbus_config[data->type].R[i];
+ }
+ }
+
+ /*
+ * Identify supported status registers
+ */
+ if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_VOUT))
+ data->status_bits |= PB_HAVE_STATUS_VOUT;
+ if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_IOUT))
+ data->status_bits |= PB_HAVE_STATUS_IOUT;
+ if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT))
+ data->status_bits |= PB_HAVE_STATUS_INPUT;
+ if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_TEMPERATURE))
+ data->status_bits |= PB_HAVE_STATUS_TEMP;
+
+ /* Determine maximum number of sensors, booleans, and labels */
+ pmbus_find_max_attr(client, data);
+
+ ret = -ENOMEM;
+ data->sensors = kzalloc(sizeof(struct pmbus_sensor) * data->max_sensors,
+ GFP_KERNEL);
+ if (!data->sensors)
+ goto out_data;
+
+ data->booleans = kzalloc(sizeof(struct pmbus_boolean)
+ * data->max_booleans, GFP_KERNEL);
+ if (!data->booleans)
+ goto out_sensors;
+
+ data->labels = kzalloc(sizeof(struct pmbus_label) * data->max_labels,
+ GFP_KERNEL);
+ if (!data->labels)
+ goto out_booleans;
+
+ data->attributes = kzalloc(sizeof(struct attribute *)
+ * data->max_attributes, GFP_KERNEL);
+ if (!data->attributes)
+ goto out_labels;
+
+ pmbus_find_attributes(client, data);
+
+ /*
+ * If there are no attributes, something is wrong.
+ * Bail out instead of trying to register nothing.
+ */
+ if (!data->num_attributes) {
+ ret = -ENODEV;
+ goto out_attributes;
+ }
+
+ /* Register sysfs hooks */
+ data->group.attrs = data->attributes;
+ ret = sysfs_create_group(&client->dev.kobj, &data->group);
+ if (ret)
+ goto out_attributes;
+ 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, &data->group);
+out_attributes:
+ kfree(data->attributes);
+out_labels:
+ kfree(data->labels);
+out_booleans:
+ kfree(data->booleans);
+out_sensors:
+ kfree(data->sensors);
+out_data:
+ kfree(data);
+out:
+ return ret;
+}
+
+static int pmbus_remove(struct i2c_client *client)
+{
+ struct pmbus_data *data = i2c_get_clientdata(client);
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &data->group);
+ kfree(data->attributes);
+ kfree(data->labels);
+ kfree(data->booleans);
+ kfree(data->sensors);
+ kfree(data);
+ return 0;
+}
+
+static const struct i2c_device_id pmbus_id[] = {
+ {"bmr45x", pmbus},
+ {"ltc2978", ltc2978},
+ {"max16064", max16064},
+ {"max8688", max8688},
+ {"pmbus", pmbus},
+ {"ucd921x", pmbus},
+ {"ucd9220", ucd9220},
+ {"ucd9240", ucd9240},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, pmbus_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver pmbus_driver = {
+ .driver = {
+ .name = "pmbus",
+ },
+ .probe = pmbus_probe,
+ .remove = pmbus_remove,
+ .id_table = pmbus_id,
+};
+
+static int __init pmbus_init(void)
+{
+ return i2c_add_driver(&pmbus_driver);
+}
+
+static void __exit pmbus_exit(void)
+{
+ i2c_del_driver(&pmbus_driver);
+}
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver");
+MODULE_LICENSE("GPL");
+module_init(pmbus_init);
+module_exit(pmbus_exit);
diff --git a/drivers/hwmon/pmbus.h b/drivers/hwmon/pmbus.h
new file mode 100644
index 0000000..2a8a027
--- /dev/null
+++ b/drivers/hwmon/pmbus.h
@@ -0,0 +1,209 @@
+/*
+ * pmbus.h - Common defines and structures for PMBus devices
+ *
+ * Copyright (c) 2010 Ericsson AB.
+ *
+ * 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.
+ */
+
+#ifndef PMBUS_H
+#define PMBUS_H
+
+/*
+ * Registers
+ */
+#define PMBUS_PAGE 0x00
+#define PMBUS_OPERATION 0x01
+#define PMBUS_ON_OFF_CONFIG 0x02
+#define PMBUS_CLEAR_FAULTS 0x03
+#define PMBUS_PHASE 0x04
+
+#define PMBUS_CAPABILITY 0x19
+#define PMBUS_QUERY 0x1A
+
+#define PMBUS_VOUT_MODE 0x20
+#define PMBUS_VOUT_COMMAND 0x21
+#define PMBUS_VOUT_TRIM 0x22
+#define PMBUS_VOUT_CAL_OFFSET 0x23
+#define PMBUS_VOUT_MAX 0x24
+#define PMBUS_VOUT_MARGIN_HIGH 0x25
+#define PMBUS_VOUT_MARGIN_LOW 0x26
+#define PMBUS_VOUT_TRANSITION_RATE 0x27
+#define PMBUS_VOUT_DROOP 0x28
+#define PMBUS_VOUT_SCALE_LOOP 0x29
+#define PMBUS_VOUT_SCALE_MONITOR 0x2A
+
+#define PMBUS_COEFFICIENTS 0x30
+#define PMBUS_POUT_MAX 0x31
+
+#define PMBUS_VOUT_OV_FAULT_LIMIT 0x40
+#define PMBUS_VOUT_OV_FAULT_RESPONSE 0x41
+#define PMBUS_VOUT_OV_WARN_LIMIT 0x42
+#define PMBUS_VOUT_UV_WARN_LIMIT 0x43
+#define PMBUS_VOUT_UV_FAULT_LIMIT 0x44
+#define PMBUS_VOUT_UV_FAULT_RESPONSE 0x45
+#define PMBUS_IOUT_OC_FAULT_LIMIT 0x46
+#define PMBUS_IOUT_OC_FAULT_RESPONSE 0x47
+#define PMBUS_IOUT_OC_LV_FAULT_LIMIT 0x48
+#define PMBUS_IOUT_OC_LV_FAULT_RESPONSE 0x49
+#define PMBUS_IOUT_OC_WARN_LIMIT 0x4A
+#define PMBUS_IOUT_UC_FAULT_LIMIT 0x4B
+#define PMBUS_IOUT_UC_FAULT_RESPONSE 0x4C
+
+#define PMBUS_OT_FAULT_LIMIT 0x4F
+#define PMBUS_OT_FAULT_RESPONSE 0x50
+#define PMBUS_OT_WARN_LIMIT 0x51
+#define PMBUS_UT_WARN_LIMIT 0x52
+#define PMBUS_UT_FAULT_LIMIT 0x53
+#define PMBUS_UT_FAULT_RESPONSE 0x54
+#define PMBUS_VIN_OV_FAULT_LIMIT 0x55
+#define PMBUS_VIN_OV_FAULT_RESPONSE 0x56
+#define PMBUS_VIN_OV_WARN_LIMIT 0x57
+#define PMBUS_VIN_UV_WARN_LIMIT 0x58
+#define PMBUS_VIN_UV_FAULT_LIMIT 0x59
+
+#define PMBUS_IIN_OC_FAULT_LIMIT 0x5B
+#define PMBUS_IIN_OC_WARN_LIMIT 0x5D
+
+#define PMBUS_POUT_OP_FAULT_LIMIT 0x68
+#define PMBUS_POUT_OP_WARN_LIMIT 0x6A
+#define PMBUS_PIN_OP_WARN_LIMIT 0x6B
+
+#define PMBUS_STATUS_BYTE 0x78
+#define PMBUS_STATUS_WORD 0x79
+#define PMBUS_STATUS_VOUT 0x7A
+#define PMBUS_STATUS_IOUT 0x7B
+#define PMBUS_STATUS_INPUT 0x7C
+#define PMBUS_STATUS_TEMPERATURE 0x7D
+#define PMBUS_STATUS_CML 0x7E
+#define PMBUS_STATUS_OTHER 0x7F
+#define PMBUS_STATUS_MFR_SPECIFIC 0x80
+#define PMBUS_STATUS_FANS_1_2 0x81
+#define PMBUS_STATUS_FANS_3_4 0x82
+
+#define PMBUS_READ_VIN 0x88
+#define PMBUS_READ_IIN 0x89
+#define PMBUS_READ_VCAP 0x8A
+#define PMBUS_READ_VOUT 0x8B
+#define PMBUS_READ_IOUT 0x8C
+#define PMBUS_READ_TEMPERATURE_1 0x8D
+#define PMBUS_READ_TEMPERATURE_2 0x8E
+#define PMBUS_READ_TEMPERATURE_3 0x8F
+#define PMBUS_READ_FAN_SPEED_1 0x90
+#define PMBUS_READ_FAN_SPEED_2 0x91
+#define PMBUS_READ_FAN_SPEED_3 0x92
+#define PMBUS_READ_FAN_SPEED_4 0x93
+#define PMBUS_READ_DUTY_CYCLE 0x94
+#define PMBUS_READ_FREQUENCY 0x95
+#define PMBUS_READ_POUT 0x96
+#define PMBUS_READ_PIN 0x97
+
+#define PMBUS_REVISION 0x98
+#define PMBUS_MFR_ID 0x99
+#define PMBUS_MFR_MODEL 0x9A
+#define PMBUS_MFR_REVISION 0x9B
+#define PMBUS_MFR_LOCATION 0x9C
+#define PMBUS_MFR_DATE 0x9D
+#define PMBUS_MFR_SERIAL 0x9E
+
+#define LTC2978_MFR_SPECIAL_ID 0xE7
+
+/*
+ * CAPABILITY
+ */
+#define PB_CAPABILITY_SMBALERT (1<<4)
+#define PB_CAPABILITY_ERROR_CHECK (1<<7)
+
+/*
+ * VOUT_MODE
+ */
+#define PB_VOUT_MODE_MODE_MASK 0xe0
+#define PB_VOUT_MODE_PARAM_MASK 0x1f
+
+#define PB_VOUT_MODE_LINEAR 0x00
+#define PB_VOUT_MODE_VID 0x20
+#define PB_VOUT_MODE_DIRECT 0x40
+
+/*
+ * STATUS_BYTE, STATUS_WORD (lower)
+ */
+#define PB_STATUS_NONE_ABOVE (1<<0)
+#define PB_STATUS_CML (1<<1)
+#define PB_STATUS_TEMPERATURE (1<<2)
+#define PB_STATUS_VIN_UV (1<<3)
+#define PB_STATUS_IOUT_OC (1<<4)
+#define PB_STATUS_VOUT_OV (1<<5)
+#define PB_STATUS_OFF (1<<6)
+#define PB_STATUS_BUSY (1<<7)
+
+/*
+ * STATUS_WORD (upper)
+ */
+#define PB_STATUS_UNKNOWN (1<<8)
+#define PB_STATUS_OTHER (1<<9)
+#define PB_STATUS_FANS (1<<10)
+#define PB_STATUS_POWER_GOOD_N (1<<11)
+#define PB_STATUS_WORD_MFR (1<<12)
+#define PB_STATUS_INPUT (1<<13)
+#define PB_STATUS_IOUT_POUT (1<<14)
+#define PB_STATUS_VOUT (1<<15)
+
+/*
+ * STATUS_IOUT
+ */
+#define PB_POUT_OP_WARNING (1<<0)
+#define PB_POUT_OP_FAULT (1<<1)
+#define PB_POWER_LIMITING (1<<2)
+#define PB_CURRENT_SHARE_FAULT (1<<3)
+#define PB_IOUT_UC_FAULT (1<<4)
+#define PB_IOUT_OC_WARNING (1<<5)
+#define PB_IOUT_OC_LV_FAULT (1<<6)
+#define PB_IOUT_OC_FAULT (1<<7)
+
+/*
+ * STATUS_VOUT, STATUS_INPUT
+ */
+#define PB_VOLTAGE_UV_FAULT (1<<4)
+#define PB_VOLTAGE_UV_WARNING (1<<5)
+#define PB_VOLTAGE_OV_WARNING (1<<6)
+#define PB_VOLTAGE_OV_FAULT (1<<7)
+
+/*
+ * STATUS_INPUT
+ */
+#define PB_PIN_OP_WARNING (1<<0)
+#define PB_IIN_OC_WARNING (1<<1)
+#define PB_IIN_OC_FAULT (1<<2)
+
+/*
+ * STATUS_TEMPERATURE
+ */
+#define PB_TEMP_UT_FAULT (1<<4)
+#define PB_TEMP_UT_WARNING (1<<5)
+#define PB_TEMP_OT_WARNING (1<<6)
+#define PB_TEMP_OT_FAULT (1<<7)
+
+/*
+ * CML_FAULT_STATUS
+ */
+#define PB_CML_FAULT_OTHER_MEM_LOGIC (1<<0)
+#define PB_CML_FAULT_OTHER_COMM (1<<1)
+#define PB_CML_FAULT_PROCESSOR (1<<3)
+#define PB_CML_FAULT_MEMORY (1<<4)
+#define PB_CML_FAULT_PACKET_ERROR (1<<5)
+#define PB_CML_FAULT_INVALID_DATA (1<<6)
+#define PB_CML_FAULT_INVALID_COMMAND (1<<7)
+
+#endif /* PB_H */
--
1.7.0.87.g0901d
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH/RFC v2 2/4] hwmon: i2c PMBus device emulator
[not found] ` <1278303018-22069-1-git-send-email-guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
2010-07-05 4:10 ` [PATCH/RFC v2 1/4] " Guenter Roeck
@ 2010-07-05 4:10 ` Guenter Roeck
2010-07-05 4:10 ` [PATCH/RFC v2 3/4] hwmon: pmbus driver documentation Guenter Roeck
2010-07-05 4:10 ` [PATCH/RFC v2 4/4] hwmon: sysfs API updates Guenter Roeck
3 siblings, 0 replies; 8+ messages in thread
From: Guenter Roeck @ 2010-07-05 4:10 UTC (permalink / raw)
To: Jean Delvare, Jonathan Cameron, Randy Dunlap, Andrew Morton
Cc: lm-sensors-GZX6beZjE8VD60Wz+7aTrA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-i2c-u79uwXL29TY76Z2rM5mHXA, Guenter Roeck
Signed-off-by: Guenter Roeck <guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
---
Documentation/i2c/i2c-pmbus | 41 ++
drivers/i2c/busses/Kconfig | 13 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-pmbus.c | 877 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 932 insertions(+), 0 deletions(-)
create mode 100644 Documentation/i2c/i2c-pmbus
create mode 100644 drivers/i2c/busses/i2c-pmbus.c
diff --git a/Documentation/i2c/i2c-pmbus b/Documentation/i2c/i2c-pmbus
new file mode 100644
index 0000000..4ba01fc
--- /dev/null
+++ b/Documentation/i2c/i2c-pmbus
@@ -0,0 +1,41 @@
+MODULE: i2c-pmbus
+
+DESCRIPTION:
+
+This module is a fake I2C/SMBus driver to emulate various PMBus devices.
+It implements five types of SMBus commands: write quick, (r/w) byte,
+(r/w) byte data, (r/w) word data, and (r/w) I2C block data.
+
+The driver supports various PMBus devices at fixed addresses. The following
+PMBus devices are supported.
+
+Device Address
+BMR453 0x10
+LTC2978 0x20
+MAX16064 0x30
+MAX8688 0x40
+UCD9240 0x50
+
+No hardware is needed nor associated with this module. It will accept write
+quick commands to the specified addresses; it will respond to the other
+commands (also to the specified addresses) by reading from or writing to
+arrays in memory.
+
+Once loaded, the driver randomly changes sensor readings, up to lower and upper
+fault limits. This may cause alarms or faults to be raised. This is expected
+behavior.
+
+The typical use-case is like this:
+ 1. load this module
+ 3. load the target chip driver module
+ 4. observe its behavior using the sensors command
+
+
+CAVEATS:
+
+Support for multiple pages (PMBus PAGE command) is limited. Pages can be
+selected, but there is only one set of data, causing all paged registers to
+return the same values.
+
+The emulator does not support self-modification of sensor readings for devices
+which have to be programmed in direct mode.
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index bceafbf..5ab4abc 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -731,6 +731,19 @@ config I2C_PCA_ISA
delays when I2C/SMBus chip drivers are loaded (e.g. at boot
time). If unsure, say N.
+config I2C_PMBUS
+ tristate "I2C/PMBus Chip Emulator"
+ depends on EXPERIMENTAL
+ default 'n'
+ help
+ This module emulates various PMBus devices. It may be useful to
+ developers of PMBus client drivers.
+
+ If you do build this module, be sure to read the notes and warnings
+ in <file:Documentation/i2c/i2c-pmbus>.
+
+ If you don't know what to do here, definitely say N.
+
config I2C_SIBYTE
tristate "SiByte SMBus interface"
depends on SIBYTE_SB1xxx_SOC
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 936880b..c11884e 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_I2C_TINY_USB) += i2c-tiny-usb.o
obj-$(CONFIG_I2C_ACORN) += i2c-acorn.o
obj-$(CONFIG_I2C_ELEKTOR) += i2c-elektor.o
obj-$(CONFIG_I2C_PCA_ISA) += i2c-pca-isa.o
+obj-$(CONFIG_I2C_PMBUS) += i2c-pmbus.o
obj-$(CONFIG_I2C_SIBYTE) += i2c-sibyte.o
obj-$(CONFIG_I2C_STUB) += i2c-stub.o
obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
diff --git a/drivers/i2c/busses/i2c-pmbus.c b/drivers/i2c/busses/i2c-pmbus.c
new file mode 100644
index 0000000..9716e2f
--- /dev/null
+++ b/drivers/i2c/busses/i2c-pmbus.c
@@ -0,0 +1,877 @@
+/*
+ * i2c-pmbus.c - I2C/SMBus chip emulator
+ *
+ * Copyright (C) 2010 Ericsson AB.
+ *
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/random.h>
+#include "../../hwmon/pmbus.h"
+
+#define NUM_CHIPS 5
+
+enum chips { bmr453, ltc2978, max16064, max8688, ucd9240 };
+
+/*
+ * Register sizes per PMBus specification.
+ */
+static s8 pmbus_regsize[256] = {
+ 1, 1, 1, 0, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 16, -1, -1, -1, -1, -1,
+ 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1,
+ 16, 2, 2, 2, -1, 2, 2, 2, 2, 2, 1, 2, 2, 1, 2, 2,
+ 2, 1, 2, 2, 2, 1, 2, 1, 2, 1, 2, 2, 1, -1, -1, 2,
+ 1, 2, 2, 2, 1, 2, 1, 2, 2, 2, 1, 2, 1, 2, 2, 2,
+ 2, 2, 2, 1, 2, 2, 2, -1, 2, 1, 2, 2, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, -1, -1, -1, -1, -1, 2, 2, 2, 2, 2, 2, 2, 2,
+ 2, 2, 2, 2, 2, 2, 2, 2, 1, 16, 16, 16, 16, 16, 16, -1,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 14, 14, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+};
+
+/*
+ * PMBus register types. 1=rw, 0=ro or undefined
+ */
+static s8 pmbus_rw[256] = {
+ 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
+ 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+/*
+ * exp 0xf8 -> 2^-1; mantissa 0x01 = 0.5V
+ * exp 0xf0 -> 2^-2; mantissa 0x01 = 0.25V
+ * exp 0xd0 -> 2^-6; mantissa 0x01 = 0.025V, 0x10 = 0.25V
+ */
+#define V1P5_LINEAR 0xd060
+#define V2P5_LINEAR 0xd0a0
+#define V2P75_LINEAR 0xd0b0
+#define V3P25_LINEAR 0xd0d0
+#define V3P5_LINEAR 0xd0e0
+#define V3P75_LINEAR 0xd0f0
+#define V11P5_LINEAR 0xf817
+#define V11P25_LINEAR 0xf02d
+#define V12_LINEAR 0xf818
+#define V12P5_LINEAR 0xf032
+#define V12P75_LINEAR 0xf033
+
+static u16 pmbus_linear_data[256] = {
+ [PMBUS_PAGE] = 0,
+
+ [PMBUS_CAPABILITY] = PB_CAPABILITY_SMBALERT,
+ [PMBUS_VOUT_MODE] = (PB_VOUT_MODE_LINEAR | 0x13),
+ /* linear, -13 */
+
+ [PMBUS_VIN_OV_FAULT_LIMIT] = V12P75_LINEAR,
+ [PMBUS_VIN_OV_WARN_LIMIT] = V12P5_LINEAR,
+ [PMBUS_VIN_UV_WARN_LIMIT] = V11P5_LINEAR,
+ [PMBUS_VIN_UV_FAULT_LIMIT] = V11P25_LINEAR,
+
+ [PMBUS_VOUT_OV_FAULT_LIMIT] = V3P5_LINEAR,
+ [PMBUS_VOUT_OV_WARN_LIMIT] = V3P25_LINEAR,
+ [PMBUS_VOUT_UV_WARN_LIMIT] = V2P75_LINEAR,
+ [PMBUS_VOUT_UV_FAULT_LIMIT] = V2P5_LINEAR,
+
+ [PMBUS_IOUT_OC_FAULT_LIMIT] = 22,
+ [PMBUS_IOUT_OC_LV_FAULT_LIMIT] = 30,
+ [PMBUS_IOUT_OC_WARN_LIMIT] = 20,
+ [PMBUS_IOUT_UC_FAULT_LIMIT] = 0,
+
+ [PMBUS_IIN_OC_FAULT_LIMIT] = 20,
+ [PMBUS_IIN_OC_WARN_LIMIT] = 19,
+
+ [PMBUS_POUT_OP_FAULT_LIMIT] = 0x1000 | 50, /* 200 */
+ [PMBUS_POUT_OP_WARN_LIMIT] = 0x1000 | 45, /* 180 */
+ [PMBUS_PIN_OP_WARN_LIMIT] = 0x1000 | 60, /* 240 */
+
+ [PMBUS_OT_FAULT_LIMIT] = 100,
+ [PMBUS_OT_WARN_LIMIT] = 90,
+ [PMBUS_UT_WARN_LIMIT] = 10,
+ [PMBUS_UT_FAULT_LIMIT] = 0,
+
+ [PMBUS_READ_VIN] = V12_LINEAR,
+ [PMBUS_READ_IIN] = 2,
+ [PMBUS_READ_VCAP] = V11P5_LINEAR,
+ [PMBUS_READ_VOUT] = 3,
+ [PMBUS_READ_IOUT] = 8,
+ [PMBUS_READ_TEMPERATURE_1] = 44,
+ [PMBUS_READ_TEMPERATURE_2] = 45,
+ [PMBUS_READ_TEMPERATURE_3] = 46,
+ [PMBUS_READ_FAN_SPEED_1] = 99,
+ [PMBUS_READ_FAN_SPEED_2] = 98,
+ [PMBUS_READ_FAN_SPEED_3] = 97,
+ [PMBUS_READ_FAN_SPEED_4] = 96,
+ [PMBUS_READ_DUTY_CYCLE] = 77,
+ [PMBUS_READ_FREQUENCY] = 1234,
+ [PMBUS_READ_POUT] = 100,
+ [PMBUS_READ_PIN] = 170,
+};
+
+/*
+ * Values calculated from max16064 manual
+ */
+#define V3UF_MAXIM 0x1200
+#define V3UW_MAXIM 0x1500
+#define V3_MAXIM 0x176e
+#define V3OW_MAXIM 0x1a00
+#define V3OF_MAXIM 0x2000
+
+#define I10_MAXIM 0x0906
+#define I20_MAXIM 0x120d
+#define I25_MAXIM 0x1691
+
+#define T0_MAXIM 0
+#define T20_MAXIM 0xff68
+#define T40_MAXIM 0xfecf
+#define T80_MAXIM 0xfd9f
+#define T90_MAXIM 0xfd58
+
+static u16 pmbus_maxim_data[256] = {
+ [PMBUS_VOUT_OV_FAULT_LIMIT] = V3OF_MAXIM,
+ [PMBUS_VOUT_OV_WARN_LIMIT] = V3OW_MAXIM,
+ [PMBUS_VOUT_UV_WARN_LIMIT] = V3UW_MAXIM,
+ [PMBUS_VOUT_UV_FAULT_LIMIT] = V3UF_MAXIM,
+
+ [PMBUS_IOUT_OC_FAULT_LIMIT] = I25_MAXIM,
+ [PMBUS_IOUT_OC_WARN_LIMIT] = I20_MAXIM,
+
+ [PMBUS_OT_FAULT_LIMIT] = T90_MAXIM,
+ [PMBUS_OT_WARN_LIMIT] = T80_MAXIM,
+ [PMBUS_UT_WARN_LIMIT] = T20_MAXIM,
+ [PMBUS_UT_FAULT_LIMIT] = T0_MAXIM,
+
+ [PMBUS_READ_VOUT] = V3_MAXIM,
+ [PMBUS_READ_IOUT] = I10_MAXIM,
+ [PMBUS_READ_TEMPERATURE_1] = T40_MAXIM,
+};
+
+struct pmbus_chip {
+ char name[16];
+ u8 addr;
+ bool linear;
+ u8 pages; /* Number of pages (for PAGE register) */
+ u8 pointer;
+ s8 regsize[256];
+ u16 *initdata;
+ u8 data[256][I2C_SMBUS_BLOCK_MAX];
+};
+
+static struct pmbus_chip pmbus_chips[NUM_CHIPS] = {
+ [bmr453] = {
+ .name = "bmr453",
+ .addr = 0x10,
+ .linear = 1,
+ .regsize[PMBUS_PAGE] = -1,
+ .regsize[PMBUS_PHASE] = -1,
+ .regsize[PMBUS_CAPABILITY] = -1,
+ .regsize[PMBUS_QUERY] = -1,
+ .regsize[PMBUS_VOUT_MODE] = -1,
+ .regsize[PMBUS_COEFFICIENTS] = -1,
+ .regsize[PMBUS_POUT_MAX] = -1,
+ .regsize[PMBUS_READ_IIN] = -1,
+ .regsize[PMBUS_READ_VCAP] = -1,
+ .regsize[PMBUS_READ_TEMPERATURE_3] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_1] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_2] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_3] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_4] = -1,
+ .regsize[PMBUS_READ_POUT] = -1,
+ .regsize[PMBUS_READ_PIN] = -1,
+ .regsize[PMBUS_MFR_ID] = 11,
+ .regsize[PMBUS_MFR_MODEL] = 13,
+ .initdata = pmbus_linear_data,
+ .data[PMBUS_MFR_ID] = "Ericsson AB",
+ .data[PMBUS_MFR_MODEL] = "BMR453xxxx001",
+ },
+ [ltc2978] = {
+ .name = "ltc2978",
+ .addr = 0x20,
+ .linear = 1,
+ .pages = 8,
+ .regsize[PMBUS_PHASE] = -1,
+ .regsize[PMBUS_CAPABILITY] = -1,
+ .regsize[PMBUS_QUERY] = -1,
+ .regsize[PMBUS_COEFFICIENTS] = -1,
+ .regsize[PMBUS_POUT_MAX] = -1,
+ .regsize[PMBUS_STATUS_IOUT] = -1,
+ .regsize[PMBUS_STATUS_OTHER] = -1,
+ .regsize[PMBUS_READ_IIN] = -1,
+ .regsize[PMBUS_READ_IOUT] = -1,
+ .regsize[PMBUS_READ_VCAP] = -1,
+ .regsize[PMBUS_READ_TEMPERATURE_2] = -1,
+ .regsize[PMBUS_READ_TEMPERATURE_3] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_1] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_2] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_3] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_4] = -1,
+ .regsize[PMBUS_READ_POUT] = -1,
+ .regsize[PMBUS_READ_PIN] = -1,
+ .regsize[PMBUS_MFR_ID] = -1,
+ .regsize[LTC2978_MFR_SPECIAL_ID] = 2,
+ .initdata = pmbus_linear_data,
+ .data[LTC2978_MFR_SPECIAL_ID] = { 0x01, 0x21 },
+ },
+ [max16064] = {
+ .name = "max16064",
+ .addr = 0x30,
+ .pages = 4,
+ .regsize[PMBUS_PHASE] = -1,
+ .regsize[PMBUS_QUERY] = -1,
+ .regsize[PMBUS_VOUT_MODE] = -1,
+ .regsize[PMBUS_COEFFICIENTS] = -1,
+ .regsize[PMBUS_POUT_MAX] = -1,
+ .regsize[PMBUS_STATUS_IOUT] = -1,
+ .regsize[PMBUS_STATUS_INPUT] = -1,
+ .regsize[PMBUS_STATUS_OTHER] = -1,
+ .regsize[PMBUS_READ_VIN] = -1,
+ .regsize[PMBUS_READ_IIN] = -1,
+ .regsize[PMBUS_READ_IOUT] = -1,
+ .regsize[PMBUS_READ_VCAP] = -1,
+ .regsize[PMBUS_READ_TEMPERATURE_2] = -1,
+ .regsize[PMBUS_READ_TEMPERATURE_3] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_1] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_2] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_3] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_4] = -1,
+ .regsize[PMBUS_READ_POUT] = -1,
+ .regsize[PMBUS_READ_PIN] = -1,
+ .regsize[PMBUS_MFR_ID] = 1,
+ .regsize[PMBUS_MFR_MODEL] = 1,
+ .initdata = pmbus_maxim_data,
+ .data[PMBUS_MFR_ID] = { 0x4d },
+ .data[PMBUS_MFR_MODEL] = { 0x43 },
+ },
+ [max8688] = {
+ .name = "max8688",
+ .addr = 0x40,
+ .regsize[PMBUS_PAGE] = -1,
+ .regsize[PMBUS_PHASE] = -1,
+ .regsize[PMBUS_QUERY] = -1,
+ .regsize[PMBUS_CAPABILITY] = -1,
+ .regsize[PMBUS_VOUT_MODE] = -1,
+ .regsize[PMBUS_COEFFICIENTS] = -1,
+ .regsize[PMBUS_POUT_MAX] = -1,
+ .regsize[PMBUS_STATUS_IOUT] = -1,
+ .regsize[PMBUS_STATUS_VOUT] = -1,
+ .regsize[PMBUS_STATUS_TEMPERATURE] = -1,
+ .regsize[PMBUS_STATUS_CML] = -1,
+ .regsize[PMBUS_STATUS_INPUT] = -1,
+ .regsize[PMBUS_STATUS_OTHER] = -1,
+ .regsize[PMBUS_READ_VIN] = -1,
+ .regsize[PMBUS_READ_IIN] = -1,
+ .regsize[PMBUS_READ_VCAP] = -1,
+ .regsize[PMBUS_READ_TEMPERATURE_2] = -1,
+ .regsize[PMBUS_READ_TEMPERATURE_3] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_1] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_2] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_3] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_4] = -1,
+ .regsize[PMBUS_READ_POUT] = -1,
+ .regsize[PMBUS_READ_PIN] = -1,
+ .regsize[PMBUS_MFR_ID] = 2,
+ .regsize[PMBUS_MFR_MODEL] = 2,
+ .initdata = pmbus_maxim_data,
+ .data[PMBUS_MFR_ID] = { 0x4d, 0x01 },
+ .data[PMBUS_MFR_MODEL] = { 0x41, 0x01 },
+ },
+ [ucd9240] = {
+ .name = "ucd9240",
+ .addr = 0x50,
+ .linear = 1,
+ .pages = 4,
+ .regsize[PMBUS_QUERY] = -1,
+ .regsize[PMBUS_COEFFICIENTS] = -1,
+ .regsize[PMBUS_POUT_MAX] = -1,
+ .regsize[PMBUS_UT_WARN_LIMIT] = -1,
+ .regsize[PMBUS_UT_FAULT_LIMIT] = -1,
+ .regsize[PMBUS_UT_FAULT_RESPONSE] = -1,
+ .regsize[PMBUS_IIN_OC_FAULT_LIMIT] = -1,
+ .regsize[PMBUS_IIN_OC_WARN_LIMIT] = -1,
+ .regsize[PMBUS_READ_VCAP] = -1,
+ .regsize[PMBUS_READ_TEMPERATURE_3] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_2] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_3] = -1,
+ .regsize[PMBUS_READ_FAN_SPEED_4] = -1,
+ .initdata = pmbus_linear_data,
+ },
+};
+
+static void pmbus_set_error(struct pmbus_chip *chip, u8 sreg, u16 s1, u8 s2)
+{
+ if (pmbus_regsize[PMBUS_STATUS_BYTE] > 0
+ && (!chip->regsize[PMBUS_STATUS_BYTE]
+ || chip->regsize[PMBUS_STATUS_BYTE] > 0))
+ chip->data[PMBUS_STATUS_BYTE][0] |= s1 & 0xff;
+ if (pmbus_regsize[PMBUS_STATUS_WORD] > 0
+ && (!chip->regsize[PMBUS_STATUS_WORD]
+ || chip->regsize[PMBUS_STATUS_WORD] > 0)) {
+ chip->data[PMBUS_STATUS_WORD][0] |= s1 & 0xff;
+ chip->data[PMBUS_STATUS_WORD][1] |= (s1 >> 8) & 0xff;
+ }
+ if (pmbus_regsize[sreg] > 0
+ && (!chip->regsize[sreg] || chip->regsize[sreg] > 0))
+ chip->data[sreg][0] |= s2;
+}
+
+/* Return negative errno on error. */
+static s32 pmbus_xfer(struct i2c_adapter *adap, u16 addr, unsigned short flags,
+ char read_write, u8 command, int size,
+ union i2c_smbus_data *data)
+{
+ s32 ret;
+ int i, len, regsize;
+ struct pmbus_chip *chip = NULL;
+
+ /* Search for the right chip */
+ for (i = 0; i < NUM_CHIPS && pmbus_chips[i].addr; i++) {
+ if (addr == pmbus_chips[i].addr) {
+ chip = pmbus_chips + i;
+ break;
+ }
+ }
+ if (!chip) {
+ dev_dbg(&adap->dev, "No chip at address 0x%02x\n", addr);
+ return -ENODEV;
+ }
+
+ if (size != I2C_SMBUS_QUICK && (pmbus_regsize[command] == -1
+ || chip->regsize[command] == -1)) {
+ dev_dbg(&adap->dev, "Unsupported command 0x%02x\n", command);
+ return -EINVAL;
+ }
+
+ if (size != I2C_SMBUS_QUICK && read_write == I2C_SMBUS_WRITE
+ && !pmbus_rw[command]) {
+ dev_dbg(&adap->dev, "Command 0x%02x is r/o ", command);
+ return -EACCES;
+ }
+
+ switch (size) {
+
+ case I2C_SMBUS_QUICK:
+ dev_dbg(&adap->dev, "smbus quick - addr 0x%02x\n", addr);
+ ret = 0;
+ break;
+
+ case I2C_SMBUS_BYTE:
+ if (read_write == I2C_SMBUS_WRITE) {
+ if (command == PMBUS_CLEAR_FAULTS) {
+ chip->data[PMBUS_STATUS_BYTE][0] = 0;
+ chip->data[PMBUS_STATUS_WORD][0] = 0;
+ chip->data[PMBUS_STATUS_WORD][1] = 0;
+ chip->data[PMBUS_STATUS_CML][0] = 0;
+ chip->data[PMBUS_STATUS_VOUT][0] = 0;
+ chip->data[PMBUS_STATUS_IOUT][0] = 0;
+ chip->data[PMBUS_STATUS_INPUT][0] = 0;
+ chip->data[PMBUS_STATUS_TEMPERATURE][0] = 0;
+ chip->data[PMBUS_STATUS_OTHER][0] = 0;
+ chip->data[PMBUS_STATUS_FANS_1_2][0] = 0;
+ chip->data[PMBUS_STATUS_FANS_3_4][0] = 0;
+ }
+ chip->pointer = command;
+ dev_dbg(&adap->dev, "smbus byte - addr 0x%02x, "
+ "wrote 0x%02x.\n", addr, command);
+ } else {
+ data->byte = chip->data[chip->pointer][0];
+ dev_dbg(&adap->dev, "smbus byte - addr 0x%02x, "
+ "read 0x%02x.\n", addr, data->byte);
+ }
+
+ ret = 0;
+ break;
+
+ case I2C_SMBUS_BYTE_DATA:
+ if (pmbus_regsize[command] < 1) {
+ pmbus_set_error(chip, PMBUS_STATUS_CML, PB_STATUS_CML,
+ PB_CML_FAULT_OTHER_COMM);
+ ret = -EINVAL;
+ break;
+ }
+ if (read_write == I2C_SMBUS_WRITE) {
+ if (command == PMBUS_PAGE
+ && data->byte > chip->pages) {
+ pmbus_set_error(chip, PMBUS_STATUS_CML,
+ PB_STATUS_CML,
+ PB_CML_FAULT_OTHER_COMM);
+ ret = -EINVAL;
+ break;
+ }
+ chip->data[command][0] = data->byte;
+ chip->data[command][1] = 0;
+ dev_dbg(&adap->dev, "smbus byte data - addr 0x%02x, "
+ "wrote 0x%02x at 0x%02x.\n",
+ addr, data->byte, command);
+ } else {
+ data->byte = chip->data[command][0];
+ dev_dbg(&adap->dev, "smbus byte data - addr 0x%02x, "
+ "read 0x%02x at 0x%02x.\n",
+ addr, data->byte, command);
+ }
+
+ ret = 0;
+ break;
+
+ case I2C_SMBUS_WORD_DATA:
+ if (pmbus_regsize[command] < 2) {
+ pmbus_set_error(chip, PMBUS_STATUS_CML, PB_STATUS_CML,
+ PB_CML_FAULT_OTHER_COMM);
+ ret = -EINVAL;
+ break;
+ }
+ if (read_write == I2C_SMBUS_WRITE) {
+ chip->data[command][0] = data->word & 0xff;
+ chip->data[command][1] = (data->word >> 8) & 0xff;
+ dev_dbg(&adap->dev, "smbus word data - addr 0x%02x, "
+ "wrote 0x%04x at 0x%02x.\n",
+ addr, data->word, command);
+ } else {
+ data->word = (chip->data[command][0]
+ | (chip->data[command][1] << 8));
+ dev_dbg(&adap->dev, "smbus word data - addr 0x%02x, "
+ "read 0x%04x at 0x%02x.\n",
+ addr, data->word, command);
+ }
+
+ ret = 0;
+ break;
+
+ case I2C_SMBUS_BLOCK_DATA:
+ len = data->block[0];
+ regsize = pmbus_regsize[command];
+ if (chip->regsize[command])
+ regsize = chip->regsize[command];
+ if (len <= 0 || len > regsize) {
+ pmbus_set_error(chip, PMBUS_STATUS_CML, PB_STATUS_CML,
+ PB_CML_FAULT_OTHER_COMM);
+ ret = -EINVAL;
+ break;
+ }
+ if (read_write == I2C_SMBUS_WRITE) {
+ for (i = 1; i <= len; i++)
+ chip->data[command][i-1] = data->block[i];
+ } else {
+ data->block[0] = regsize;
+ for (i = 0; i < regsize; i++)
+ data->block[i+1] = chip->data[command][i];
+ }
+
+ ret = 0;
+ break;
+
+ default:
+ dev_dbg(&adap->dev, "Unsupported I2C/SMBus command\n");
+ ret = -EOPNOTSUPP;
+ break;
+ } /* switch (size) */
+
+ return ret;
+}
+
+static u32 pmbus_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
+ I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_SMBUS_BLOCK_DATA;
+}
+
+static const struct i2c_algorithm smbus_algorithm = {
+ .functionality = pmbus_func,
+ .smbus_xfer = pmbus_xfer,
+};
+
+static struct i2c_adapter pmbus_adapter = {
+ .owner = THIS_MODULE,
+ .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
+ .algo = &smbus_algorithm,
+ .nr = 2,
+ .name = "SMBus pmbus driver",
+};
+
+struct boundaries {
+ u8 reg;
+ u8 warn_low;
+ u8 warn_high;
+ u8 fault_low;
+ u8 fault_high;
+ u8 status_reg;
+ u8 warn_status_low;
+ u8 warn_status_high;
+ u8 fault_status_low;
+ u8 fault_status_high;
+ u8 g_status_bit_low;
+ u8 g_status_bit_high;
+ int min, max;
+};
+
+static struct boundaries boundaries[] = {
+ {
+ .reg = PMBUS_READ_VIN,
+ .warn_low = PMBUS_VIN_UV_WARN_LIMIT,
+ .warn_high = PMBUS_VIN_OV_WARN_LIMIT,
+ .fault_low = PMBUS_VIN_UV_FAULT_LIMIT,
+ .fault_high = PMBUS_VIN_OV_FAULT_LIMIT,
+ .status_reg = PMBUS_STATUS_INPUT,
+ .warn_status_low = PB_VOLTAGE_UV_WARNING,
+ .warn_status_high = PB_VOLTAGE_OV_WARNING,
+ .fault_status_low = PB_VOLTAGE_UV_FAULT,
+ .fault_status_high = PB_VOLTAGE_OV_FAULT,
+ .g_status_bit_low = PB_STATUS_VIN_UV,
+ .min = 0,
+ .max = 50000,
+ },
+ {
+ .reg = PMBUS_READ_VOUT,
+ .warn_low = PMBUS_VOUT_UV_WARN_LIMIT,
+ .warn_high = PMBUS_VOUT_OV_WARN_LIMIT,
+ .fault_low = PMBUS_VOUT_UV_FAULT_LIMIT,
+ .fault_high = PMBUS_VOUT_OV_FAULT_LIMIT,
+ .status_reg = PMBUS_STATUS_VOUT,
+ .warn_status_low = PB_VOLTAGE_UV_WARNING,
+ .warn_status_high = PB_VOLTAGE_OV_WARNING,
+ .fault_status_low = PB_VOLTAGE_UV_FAULT,
+ .fault_status_high = PB_VOLTAGE_OV_FAULT,
+ .g_status_bit_high = PB_STATUS_VOUT_OV,
+ .min = 0,
+ .max = 50000,
+ },
+ {
+ .reg = PMBUS_READ_PIN,
+ .warn_high = PMBUS_PIN_OP_WARN_LIMIT,
+ .status_reg = PMBUS_STATUS_INPUT,
+ .warn_status_high = PB_PIN_OP_WARNING,
+ .min = 0,
+ .max = 1000000,
+ },
+ {
+ .reg = PMBUS_READ_POUT,
+ .warn_high = PMBUS_POUT_OP_WARN_LIMIT,
+ .fault_high = PMBUS_POUT_OP_FAULT_LIMIT,
+ .status_reg = PMBUS_STATUS_IOUT,
+ .warn_status_high = PB_POUT_OP_WARNING,
+ .fault_status_high = PB_POUT_OP_FAULT,
+ .min = 0,
+ .max = 1000000,
+ },
+ {
+ .reg = PMBUS_READ_IIN,
+ .warn_high = PMBUS_IIN_OC_WARN_LIMIT,
+ .fault_high = PMBUS_IIN_OC_FAULT_LIMIT,
+ .status_reg = PMBUS_STATUS_INPUT,
+ .warn_status_high = PB_IIN_OC_WARNING,
+ .fault_status_high = PB_IIN_OC_FAULT,
+ .min = 0,
+ .max = 10000,
+ },
+ {
+ .reg = PMBUS_READ_IOUT,
+ .warn_high = PMBUS_IOUT_OC_WARN_LIMIT,
+ .fault_low = PMBUS_IOUT_UC_FAULT_LIMIT,
+ .fault_high = PMBUS_IOUT_OC_FAULT_LIMIT,
+ .status_reg = PMBUS_STATUS_IOUT,
+ .warn_status_high = PB_IOUT_OC_WARNING,
+ .fault_status_low = PB_IOUT_UC_FAULT,
+ .fault_status_high = PB_IOUT_OC_FAULT,
+ .g_status_bit_high = PB_STATUS_IOUT_OC,
+ .min = 0,
+ .max = 10000,
+ },
+ {
+ .reg = PMBUS_READ_TEMPERATURE_1,
+ .warn_low = PMBUS_UT_WARN_LIMIT,
+ .warn_high = PMBUS_OT_WARN_LIMIT,
+ .fault_low = PMBUS_UT_FAULT_LIMIT,
+ .fault_high = PMBUS_OT_FAULT_LIMIT,
+ .status_reg = PMBUS_STATUS_TEMPERATURE,
+ .warn_status_low = PB_TEMP_UT_WARNING,
+ .warn_status_high = PB_TEMP_OT_WARNING,
+ .fault_status_low = PB_TEMP_UT_FAULT,
+ .fault_status_high = PB_TEMP_OT_FAULT,
+ .g_status_bit_low = PB_STATUS_TEMPERATURE,
+ .g_status_bit_high = PB_STATUS_TEMPERATURE,
+ .min = 0,
+ .max = 100,
+ },
+ {
+ .reg = PMBUS_READ_TEMPERATURE_2,
+ .warn_low = PMBUS_UT_WARN_LIMIT,
+ .warn_high = PMBUS_OT_WARN_LIMIT,
+ .fault_low = PMBUS_UT_FAULT_LIMIT,
+ .fault_high = PMBUS_OT_FAULT_LIMIT,
+ .status_reg = PMBUS_STATUS_TEMPERATURE,
+ .warn_status_low = PB_TEMP_UT_WARNING,
+ .warn_status_high = PB_TEMP_OT_WARNING,
+ .fault_status_low = PB_TEMP_UT_FAULT,
+ .fault_status_high = PB_TEMP_OT_FAULT,
+ .g_status_bit_low = PB_STATUS_TEMPERATURE,
+ .g_status_bit_high = PB_STATUS_TEMPERATURE,
+ .min = 0,
+ .max = 100,
+ },
+ {
+ .reg = PMBUS_READ_TEMPERATURE_3,
+ .warn_low = PMBUS_UT_WARN_LIMIT,
+ .warn_high = PMBUS_OT_WARN_LIMIT,
+ .fault_low = PMBUS_UT_FAULT_LIMIT,
+ .fault_high = PMBUS_OT_FAULT_LIMIT,
+ .status_reg = PMBUS_STATUS_TEMPERATURE,
+ .warn_status_low = PB_TEMP_UT_WARNING,
+ .warn_status_high = PB_TEMP_OT_WARNING,
+ .fault_status_low = PB_TEMP_UT_FAULT,
+ .fault_status_high = PB_TEMP_OT_FAULT,
+ .g_status_bit_low = PB_STATUS_TEMPERATURE,
+ .g_status_bit_high = PB_STATUS_TEMPERATURE,
+ .min = 0,
+ .max = 100,
+ },
+};
+
+static int lintoval(u16 adc)
+{
+ s16 exponent, mantissa;
+ int val;
+
+ exponent = adc >> 11;
+ mantissa = adc & 0x07ff;
+
+ if (exponent > 0x0f)
+ exponent |= 0xffe0; /* sign extend exponent */
+ if (mantissa > 0x03ff)
+ mantissa |= 0xf800; /* sign extend mantissa */
+
+ /* scale result to milli-units */
+ val = mantissa * 1000;
+
+ if (exponent > 0)
+ val <<= exponent;
+ else if (exponent < 0)
+ val >>= -exponent;
+
+ return val;
+}
+
+static u16 valtolin(int val)
+{
+ s16 exponent = 0, mantissa = 0;
+
+ if (val < 0) {
+ while (val < -1024 * 512) {
+ exponent++;
+ val /= 2;
+ }
+ while (val > -1024 * 256) {
+ exponent--;
+ val *= 2;
+ }
+ } else if (val > 0) {
+ while (val > 1024 * 512) {
+ exponent++;
+ val /= 2;
+ }
+ while (val < 1024 * 256) {
+ exponent--;
+ val *= 2;
+ }
+ }
+ mantissa = (val + 500) / 1000;
+
+ return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
+}
+
+static void i2c_pmbus_update_chip(struct pmbus_chip *chip)
+{
+ int i, reg;
+
+ for (reg = PMBUS_READ_VIN; reg <= PMBUS_READ_PIN; reg++) {
+ u16 regval;
+ s8 offset;
+ int val, lf = 0, lw = 0, uf = 0, uw = 0, factor;
+ struct boundaries *b;
+
+ if (pmbus_regsize[reg] == -1 || chip->regsize[reg] == -1)
+ continue;
+ for (i = 0; i < ARRAY_SIZE(boundaries); i++) {
+ if (boundaries[i].reg == reg)
+ break;
+ }
+ if (i >= ARRAY_SIZE(boundaries))
+ continue;
+ b = &boundaries[i];
+
+ /* Randomly increase or decrease value up to
+ * critical limit. If a limit is exceeded, set
+ * warning/fault flag as appropriate
+ */
+ regval = (chip->data[reg][0] | (chip->data[reg][1] << 8));
+ val = lintoval(regval);
+ get_random_bytes(&offset, 1);
+ /* Change value up to approximately 1% */
+ factor = val >> 14;
+ if (factor < 0)
+ factor = -factor;
+ if (factor == 0)
+ factor = 1;
+ val += offset * factor;
+ if (b->fault_low) {
+ lf = lintoval(chip->data[b->fault_low][0]
+ | (chip->data[b->fault_low][1] << 8));
+ if (val < lf)
+ val = lf - 1;
+ }
+ if (b->warn_low) {
+ lw = lintoval(chip->data[b->warn_low][0]
+ | (chip->data[b->warn_low][1] << 8));
+ if (!b->fault_low && val < lw)
+ val = lw - 1;
+ }
+ if (!b->fault_low && !b->warn_low && val < b->min)
+ val = b->min;
+ if (b->fault_high) {
+ uf = lintoval(chip->data[b->fault_high][0]
+ | (chip->data[b->fault_high][1] << 8));
+ if (val > uf)
+ val = uf + 1;
+ }
+ if (b->warn_high) {
+ uw = lintoval(chip->data[b->warn_high][0]
+ | (chip->data[b->warn_high][1] << 8));
+ if (!b->fault_high && val > uw)
+ val = uw + 1;
+ }
+ if (!b->fault_high && !b->warn_high && val > b->max)
+ val = b->max;
+ if (b->status_reg && b->fault_status_low && b->fault_low) {
+ if (val < lf) {
+ chip->data[b->status_reg][0]
+ |= b->fault_status_low;
+ chip->data[PMBUS_STATUS_BYTE][0] |=
+ b->g_status_bit_low;
+ }
+ }
+ if (b->status_reg && b->fault_status_high && b->fault_high) {
+ if (val > uf) {
+ chip->data[b->status_reg][0] |=
+ b->fault_status_high;
+ chip->data[PMBUS_STATUS_BYTE][0] |=
+ b->g_status_bit_high;
+ }
+ }
+ if (b->status_reg && b->warn_status_low && b->warn_low) {
+ if (val < lw) {
+ chip->data[b->status_reg][0] |=
+ b->warn_status_low;
+ chip->data[PMBUS_STATUS_BYTE][0] |=
+ b->g_status_bit_low;
+ }
+ }
+ if (b->status_reg && b->warn_status_high && b->warn_high) {
+ if (val > uw) {
+ chip->data[b->status_reg][0] |=
+ b->warn_status_high;
+ chip->data[PMBUS_STATUS_BYTE][0] |=
+ b->g_status_bit_high;
+ }
+ }
+ regval = valtolin(val);
+ chip->data[reg][0] = regval & 0xff;
+ chip->data[reg][1] = (regval >> 8) & 0xff;
+ }
+}
+
+static int i2c_pmbus_update_thread(void *p)
+{
+ while (!kthread_should_stop()) {
+ int i;
+
+ for (i = 0; i < NUM_CHIPS; i++) {
+ struct pmbus_chip *chip = &pmbus_chips[i];
+
+ if (chip->addr && chip->linear)
+ i2c_pmbus_update_chip(chip);
+ }
+ if (kthread_should_stop())
+ break;
+ msleep_interruptible(1000);
+ }
+ return 0;
+}
+
+static struct task_struct *i2c_pmbus_kthread;
+
+static int __init i2c_pmbus_init(void)
+{
+ int i, j, ret;
+
+ for (i = 0; i < NUM_CHIPS; i++) {
+ if (pmbus_chips[i].addr) {
+ u16 *initdata = pmbus_chips[i].initdata;
+ if (initdata)
+ for (j = 0; j < 256; j++)
+ if (initdata[j]) {
+ pmbus_chips[i].data[j][0]
+ = initdata[j] & 0xff;
+ pmbus_chips[i].data[j][1]
+ = (initdata[j] >> 8) & 0xff;
+ }
+ printk(KERN_INFO "i2c-pmbus: Virtual %s at 0x%02x\n",
+ pmbus_chips[i].name, pmbus_chips[i].addr);
+ }
+ }
+
+ i2c_pmbus_kthread = kthread_run(i2c_pmbus_update_thread, NULL,
+ "pmbus_update");
+
+ ret = i2c_add_numbered_adapter(&pmbus_adapter);
+ return ret;
+}
+
+static void __exit i2c_pmbus_exit(void)
+{
+ if (i2c_pmbus_kthread)
+ kthread_stop(i2c_pmbus_kthread);
+ i2c_del_adapter(&pmbus_adapter);
+}
+
+MODULE_AUTHOR("Guenter Roeck <guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>");
+MODULE_DESCRIPTION("I2C PMBus chip emulator");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_pmbus_init);
+module_exit(i2c_pmbus_exit);
--
1.7.0.87.g0901d
^ permalink raw reply related [flat|nested] 8+ messages in thread