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Subject[PATCH v5 1/5] hwmon: PMBus device driver
Date
This driver adds support for hardware monitoring features of various PMBus
devices.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
---
drivers/hwmon/Kconfig | 25 +
drivers/hwmon/Makefile | 4 +
drivers/hwmon/pmbus.c | 203 ++++++
drivers/hwmon/pmbus.h | 313 +++++++++
drivers/hwmon/pmbus_core.c | 1628 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/i2c/pmbus.h | 45 ++
6 files changed, 2218 insertions(+), 0 deletions(-)
create mode 100644 drivers/hwmon/pmbus.c
create mode 100644 drivers/hwmon/pmbus.h
create mode 100644 drivers/hwmon/pmbus_core.c
create mode 100644 include/linux/i2c/pmbus.h
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 297bc9a..948d319 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -735,6 +735,31 @@ config SENSORS_PCF8591
These devices are hard to detect and rarely found on mainstream
hardware. If unsure, say N.

+config PMBUS
+ tristate "PMBus support"
+ depends on I2C && EXPERIMENTAL
+ default n
+ help
+ Say yes here if you want to enable PMBus support.
+
+ This driver can also be built as a module. If so, the module will
+ be called pmbus_core.
+
+if PMBUS
+
+config SENSORS_PMBUS
+ tristate "Generic PMBus devices"
+ default n
+ help
+ If you say yes here you get hardware monitoring support for generic
+ PMBus devices, including but not limited to BMR450, BMR451, BMR453,
+ BMR454, and LTC2978.
+
+ This driver can also be built as a module. If so, the module will
+ be called pmbus.
+
+endif # 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 dde02d9..f7f158b 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -112,6 +112,10 @@ obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o
obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o

+# PMBus drivers
+obj-$(CONFIG_PMBUS) += pmbus_core.o
+obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
+
ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)
EXTRA_CFLAGS += -DDEBUG
endif
diff --git a/drivers/hwmon/pmbus.c b/drivers/hwmon/pmbus.c
new file mode 100644
index 0000000..98e2e28
--- /dev/null
+++ b/drivers/hwmon/pmbus.c
@@ -0,0 +1,203 @@
+/*
+ * Hardware monitoring driver for PMBus devices
+ *
+ * Copyright (c) 2010, 2011 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/mutex.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+/*
+ * Find sensor groups and status registers on each page.
+ */
+static void pmbus_find_sensor_groups(struct i2c_client *client,
+ struct pmbus_driver_info *info)
+{
+ int page;
+
+ /* Sensors detected on page 0 only */
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN))
+ info->func[0] |= PMBUS_HAVE_VIN;
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP))
+ info->func[0] |= PMBUS_HAVE_VCAP;
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN))
+ info->func[0] |= PMBUS_HAVE_IIN;
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN))
+ info->func[0] |= PMBUS_HAVE_PIN;
+ if (info->func[0]
+ && pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT))
+ info->func[0] |= PMBUS_HAVE_STATUS_INPUT;
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) {
+ info->func[0] |= PMBUS_HAVE_FAN12;
+ if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12))
+ info->func[0] |= PMBUS_HAVE_STATUS_FAN12;
+ }
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) {
+ info->func[0] |= PMBUS_HAVE_FAN34;
+ if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34))
+ info->func[0] |= PMBUS_HAVE_STATUS_FAN34;
+ }
+ if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_1)) {
+ info->func[0] |= PMBUS_HAVE_TEMP;
+ if (pmbus_check_byte_register(client, 0,
+ PMBUS_STATUS_TEMPERATURE))
+ info->func[0] |= PMBUS_HAVE_STATUS_TEMP;
+ }
+
+ /* Sensors detected on all pages */
+ for (page = 0; page < info->pages; page++) {
+ if (pmbus_check_word_register(client, page, PMBUS_READ_VOUT)) {
+ info->func[page] |= PMBUS_HAVE_VOUT;
+ if (pmbus_check_byte_register(client, page,
+ PMBUS_STATUS_VOUT))
+ info->func[page] |= PMBUS_HAVE_STATUS_VOUT;
+ }
+ if (pmbus_check_word_register(client, page, PMBUS_READ_IOUT)) {
+ info->func[page] |= PMBUS_HAVE_IOUT;
+ if (pmbus_check_byte_register(client, 0,
+ PMBUS_STATUS_IOUT))
+ info->func[page] |= PMBUS_HAVE_STATUS_IOUT;
+ }
+ if (pmbus_check_word_register(client, page, PMBUS_READ_POUT))
+ info->func[page] |= PMBUS_HAVE_POUT;
+ }
+}
+
+/*
+ * Identify chip parameters.
+ */
+static int pmbus_identify(struct i2c_client *client,
+ struct pmbus_driver_info *info)
+{
+ if (!info->pages) {
+ /*
+ * 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);
+ info->pages = page;
+ } else {
+ info->pages = 1;
+ }
+ }
+
+ /*
+ * We should check if the COEFFICIENTS register is supported.
+ * If it is, and the chip is configured for direct mode, we can 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.
+ */
+
+ /* Try to find sensor groups */
+ pmbus_find_sensor_groups(client, info);
+
+ return 0;
+}
+
+static int pmbus_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct pmbus_driver_info *info;
+ int ret;
+
+ info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->pages = id->driver_data;
+ info->identify = pmbus_identify;
+
+ ret = pmbus_do_probe(client, id, info);
+ if (ret < 0)
+ goto out;
+ return 0;
+
+out:
+ kfree(info);
+ return ret;
+}
+
+static int pmbus_remove(struct i2c_client *client)
+{
+ int ret;
+ const struct pmbus_driver_info *info;
+
+ info = pmbus_get_driver_info(client);
+ ret = pmbus_do_remove(client);
+ kfree(info);
+ return ret;
+}
+
+/*
+ * Use driver_data to set the number of pages supported by the chip.
+ */
+static const struct i2c_device_id pmbus_id[] = {
+ {"bmr450", 1},
+ {"bmr451", 1},
+ {"bmr453", 1},
+ {"bmr454", 1},
+ {"ltc2978", 8},
+ {"pmbus", 0},
+ {}
+};
+
+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("Generic 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..a81f7f2
--- /dev/null
+++ b/drivers/hwmon/pmbus.h
@@ -0,0 +1,313 @@
+/*
+ * pmbus.h - Common defines and structures for PMBus devices
+ *
+ * Copyright (c) 2010, 2011 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_FAN_CONFIG_12 0x3A
+#define PMBUS_FAN_COMMAND_1 0x3B
+#define PMBUS_FAN_COMMAND_2 0x3C
+#define PMBUS_FAN_CONFIG_34 0x3D
+#define PMBUS_FAN_COMMAND_3 0x3E
+#define PMBUS_FAN_COMMAND_4 0x3F
+
+#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_FAN_12 0x81
+#define PMBUS_STATUS_FAN_34 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
+
+/*
+ * 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
+
+/*
+ * Fan configuration
+ */
+#define PB_FAN_2_PULSE_MASK ((1 << 0) | (1 << 1))
+#define PB_FAN_2_RPM (1 << 2)
+#define PB_FAN_2_INSTALLED (1 << 3)
+#define PB_FAN_1_PULSE_MASK ((1 << 4) | (1 << 5))
+#define PB_FAN_1_RPM (1 << 6)
+#define PB_FAN_1_INSTALLED (1 << 7)
+
+/*
+ * 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)
+
+/*
+ * STATUS_FAN
+ */
+#define PB_FAN_AIRFLOW_WARNING (1<<0)
+#define PB_FAN_AIRFLOW_FAULT (1<<1)
+#define PB_FAN_FAN2_SPEED_OVERRIDE (1<<2)
+#define PB_FAN_FAN1_SPEED_OVERRIDE (1<<3)
+#define PB_FAN_FAN2_WARNING (1<<4)
+#define PB_FAN_FAN1_WARNING (1<<5)
+#define PB_FAN_FAN2_FAULT (1<<6)
+#define PB_FAN_FAN1_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)
+
+enum pmbus_sensor_classes {
+ PSC_VOLTAGE_IN = 0,
+ PSC_VOLTAGE_OUT,
+ PSC_CURRENT_IN,
+ PSC_CURRENT_OUT,
+ PSC_POWER,
+ PSC_TEMPERATURE,
+ PSC_FAN,
+ PSC_NUM_CLASSES /* Number of power sensor classes */
+};
+
+#define PMBUS_PAGES 32 /* Per PMBus specification */
+
+/* Functionality bit mask */
+#define PMBUS_HAVE_VIN (1 << 0)
+#define PMBUS_HAVE_VCAP (1 << 1)
+#define PMBUS_HAVE_VOUT (1 << 2)
+#define PMBUS_HAVE_IIN (1 << 3)
+#define PMBUS_HAVE_IOUT (1 << 4)
+#define PMBUS_HAVE_PIN (1 << 5)
+#define PMBUS_HAVE_POUT (1 << 6)
+#define PMBUS_HAVE_FAN12 (1 << 7)
+#define PMBUS_HAVE_FAN34 (1 << 8)
+#define PMBUS_HAVE_TEMP (1 << 9)
+#define PMBUS_HAVE_TEMP2 (1 << 10)
+#define PMBUS_HAVE_TEMP3 (1 << 11)
+#define PMBUS_HAVE_STATUS_VOUT (1 << 12)
+#define PMBUS_HAVE_STATUS_IOUT (1 << 13)
+#define PMBUS_HAVE_STATUS_INPUT (1 << 14)
+#define PMBUS_HAVE_STATUS_TEMP (1 << 15)
+#define PMBUS_HAVE_STATUS_FAN12 (1 << 16)
+#define PMBUS_HAVE_STATUS_FAN34 (1 << 17)
+
+struct pmbus_driver_info {
+ int pages; /* Total number of pages */
+ bool direct[PSC_NUM_CLASSES];
+ /* true if device uses direct data format
+ for the given sensor class */
+ /*
+ * 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 */
+
+ u32 func[PMBUS_PAGES]; /* Functionality, per page */
+ /*
+ * The get_status function maps manufacturing specific status values
+ * into PMBus standard status values.
+ * This function is optional and only necessary if chip specific status
+ * register values have to be mapped into standard PMBus status register
+ * values.
+ */
+ int (*get_status)(struct i2c_client *client, int page, int reg);
+ /*
+ * The identify function determines supported PMBus functionality.
+ * This function is only necessary if a chip driver supports multiple
+ * chips, and the chip functionality is not pre-determined.
+ */
+ int (*identify)(struct i2c_client *client,
+ struct pmbus_driver_info *info);
+};
+
+/* Function declarations */
+
+int pmbus_set_page(struct i2c_client *client, u8 page);
+int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg);
+void pmbus_clear_faults(struct i2c_client *client);
+bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg);
+bool pmbus_check_word_register(struct i2c_client *client, int page, int reg);
+int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
+ struct pmbus_driver_info *info);
+int pmbus_do_remove(struct i2c_client *client);
+const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client
+ *client);
+
+#endif /* PMBUS_H */
diff --git a/drivers/hwmon/pmbus_core.c b/drivers/hwmon/pmbus_core.c
new file mode 100644
index 0000000..0edab1c
--- /dev/null
+++ b/drivers/hwmon/pmbus_core.c
@@ -0,0 +1,1628 @@
+/*
+ * Hardware monitoring driver for PMBus devices
+ *
+ * Copyright (c) 2010, 2011 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 <linux/i2c/pmbus.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_FAN 1 /* input */
+#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_FAN 2 /* alarm, fault */
+#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 */
+
+/*
+ * status, status_vout, status_iout, status_fans, and status_temp
+ * are paged. status_input and status_fan34 are unpaged.
+ * status_fan34 is a special case to handle a second set of fans
+ * on page 0.
+ */
+#define PB_NUM_STATUS_REG (PMBUS_PAGES * 5 + 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_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
+#define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
+#define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + 1)
+#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 */
+ int data; /* Sensor data.
+ Negative if there was a read error */
+};
+
+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;
+
+ u32 flags; /* from platform data */
+
+ int exponent; /* linear mode: exponent for output voltages */
+
+ const struct pmbus_driver_info *info;
+
+ 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;
+};
+
+int pmbus_set_page(struct i2c_client *client, u8 page)
+{
+ struct pmbus_data *data = i2c_get_clientdata(client);
+ int rv = 0;
+ int newpage;
+
+ if (page != data->currpage) {
+ rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
+ newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
+ if (newpage != page)
+ rv = -EINVAL;
+ else
+ data->currpage = page;
+ }
+ return rv;
+}
+EXPORT_SYMBOL_GPL(pmbus_set_page);
+
+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);
+}
+
+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);
+}
+EXPORT_SYMBOL_GPL(pmbus_read_word_data);
+
+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_fault_page(struct i2c_client *client, int page)
+{
+ pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
+}
+
+void pmbus_clear_faults(struct i2c_client *client)
+{
+ struct pmbus_data *data = i2c_get_clientdata(client);
+ int i;
+
+ for (i = 0; i < data->info->pages; i++)
+ pmbus_clear_fault_page(client, i);
+}
+EXPORT_SYMBOL_GPL(pmbus_clear_faults);
+
+static int pmbus_check_status_cml(struct i2c_client *client, int page)
+{
+ int status, status2;
+
+ status = pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
+ if (status < 0 || (status & PB_STATUS_CML)) {
+ status2 = pmbus_read_byte_data(client, page, PMBUS_STATUS_CML);
+ if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
+ return -EINVAL;
+ }
+ return 0;
+}
+
+bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
+{
+ int rv;
+ struct pmbus_data *data = i2c_get_clientdata(client);
+
+ rv = pmbus_read_byte_data(client, page, reg);
+ if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
+ rv = pmbus_check_status_cml(client, page);
+ pmbus_clear_fault_page(client, page);
+ return rv >= 0;
+}
+EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
+
+bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
+{
+ int rv;
+ struct pmbus_data *data = i2c_get_clientdata(client);
+
+ rv = pmbus_read_word_data(client, page, reg);
+ if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
+ rv = pmbus_check_status_cml(client, page);
+ pmbus_clear_fault_page(client, page);
+ return rv >= 0;
+}
+EXPORT_SYMBOL_GPL(pmbus_check_word_register);
+
+const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
+{
+ struct pmbus_data *data = i2c_get_clientdata(client);
+
+ return data->info;
+}
+EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
+
+static int pmbus_get_status(struct i2c_client *client, int page, int reg)
+{
+ struct pmbus_data *data = i2c_get_clientdata(client);
+ const struct pmbus_driver_info *info = data->info;
+ int status;
+
+ if (info->get_status) {
+ status = info->get_status(client, page, reg);
+ if (status != -ENODATA)
+ return status;
+ }
+ return pmbus_read_byte_data(client, page, reg);
+}
+
+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);
+ const struct pmbus_driver_info *info = data->info;
+
+ mutex_lock(&data->update_lock);
+ if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+ int i;
+
+ for (i = 0; i < info->pages; i++)
+ data->status[PB_STATUS_BASE + i]
+ = pmbus_read_byte_data(client, i,
+ PMBUS_STATUS_BYTE);
+ for (i = 0; i < info->pages; i++) {
+ if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT))
+ continue;
+ data->status[PB_STATUS_VOUT_BASE + i]
+ = pmbus_get_status(client, i, PMBUS_STATUS_VOUT);
+ }
+ for (i = 0; i < info->pages; i++) {
+ if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT))
+ continue;
+ data->status[PB_STATUS_IOUT_BASE + i]
+ = pmbus_get_status(client, i, PMBUS_STATUS_IOUT);
+ }
+ for (i = 0; i < info->pages; i++) {
+ if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP))
+ continue;
+ data->status[PB_STATUS_TEMP_BASE + i]
+ = pmbus_get_status(client, i,
+ PMBUS_STATUS_TEMPERATURE);
+ }
+ for (i = 0; i < info->pages; i++) {
+ if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12))
+ continue;
+ data->status[PB_STATUS_FAN_BASE + i]
+ = pmbus_get_status(client, i, PMBUS_STATUS_FAN_12);
+ }
+
+ if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
+ data->status[PB_STATUS_INPUT_BASE]
+ = pmbus_get_status(client, 0, PMBUS_STATUS_INPUT);
+
+ if (info->func[0] & PMBUS_HAVE_STATUS_FAN34)
+ data->status[PB_STATUS_FAN34_BASE]
+ = pmbus_get_status(client, 0, PMBUS_STATUS_FAN_34);
+
+ for (i = 0; i < data->num_sensors; i++) {
+ struct pmbus_sensor *sensor = &data->sensors[i];
+
+ if (!data->valid || sensor->update)
+ sensor->data
+ = pmbus_read_word_data(client, sensor->page,
+ sensor->reg);
+ }
+ pmbus_clear_faults(client);
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+ mutex_unlock(&data->update_lock);
+ return data;
+}
+
+/*
+ * Convert linear sensor values to milli- or micro-units
+ * depending on sensor type.
+ */
+static int pmbus_reg2data_linear(struct pmbus_data *data,
+ struct pmbus_sensor *sensor)
+{
+ s16 exponent, mantissa;
+ long val;
+
+ if (sensor->class == PSC_VOLTAGE_OUT) {
+ exponent = data->exponent;
+ mantissa = (s16) sensor->data;
+ } else {
+ exponent = (sensor->data >> 11) & 0x001f;
+ mantissa = sensor->data & 0x07ff;
+
+ if (exponent > 0x0f)
+ exponent |= 0xffe0; /* sign extend exponent */
+ if (mantissa > 0x03ff)
+ mantissa |= 0xf800; /* sign extend mantissa */
+ }
+
+ val = mantissa;
+
+ /* scale result to milli-units for all sensors except fans */
+ if (sensor->class != PSC_FAN)
+ val = val * 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 (int)val;
+}
+
+/*
+ * Convert direct sensor values to milli- or micro-units
+ * depending on sensor type.
+ */
+static int pmbus_reg2data_direct(struct pmbus_data *data,
+ struct pmbus_sensor *sensor)
+{
+ long val = (s16) sensor->data;
+ long m, b, R;
+
+ m = data->info->m[sensor->class];
+ b = data->info->b[sensor->class];
+ R = data->info->R[sensor->class];
+
+ if (m == 0)
+ return 0;
+
+ /* X = 1/m * (Y * 10^-R - b) */
+ R = -R;
+ /* scale result to milli-units for everything but fans */
+ if (sensor->class != PSC_FAN) {
+ R += 3;
+ b *= 1000;
+ }
+
+ /* 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 (int)((val - b) / m);
+}
+
+static int pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
+{
+ int val;
+
+ if (data->info->direct[sensor->class])
+ 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;
+ }
+
+ if (class == PSC_VOLTAGE_OUT) {
+ /*
+ * For a static exponents, we don't have a choice
+ * but to adjust the value to it.
+ */
+ if (data->exponent < 0)
+ val <<= -data->exponent;
+ else
+ val >>= data->exponent;
+ val = DIV_ROUND_CLOSEST(val, 1000);
+ if (val > 0x7fff)
+ val = 0x7fff;
+ return negative ? -val : val;
+ }
+
+ /* Power is in uW. Convert to mW before converting. */
+ if (class == PSC_POWER)
+ val = DIV_ROUND_CLOSEST(val, 1000L);
+
+ /*
+ * For simplicity, convert fan data to milli-units
+ * before calculating the exponent.
+ */
+ if (class == PSC_FAN)
+ val = val * 1000;
+
+ /* 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->info->m[class];
+ b = data->info->b[class];
+ R = data->info->R[class];
+
+ /* Power is in uW. Adjust R and b. */
+ if (class == PSC_POWER) {
+ R -= 3;
+ b *= 1000;
+ }
+
+ /* Calculate Y = (m * X + b) * 10^R */
+ if (class != PSC_FAN) {
+ R -= 3; /* Adjust R and b for data in milli-units */
+ b *= 1000;
+ }
+ val = val * m + b;
+
+ 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->info->direct[class])
+ regval = pmbus_data2reg_direct(data, class, val);
+ else
+ regval = pmbus_data2reg_linear(data, class, val);
+
+ return regval;
+}
+
+/*
+ * 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,
+ * two sensor indices.
+ * The upper half-word references the two optional 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>.
+ *
+ * For booleans created with pmbus_add_boolean_reg(), only the lower 16 bits of
+ * index are set. s1 and s2 (the sensor index values) are zero in this case.
+ * The function returns true if (status[reg] & mask) is true.
+ *
+ * If the boolean was created with pmbus_add_boolean_cmp(), a comparison against
+ * a specified limit has to be performed to determine the boolean result.
+ * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
+ * sensor values referenced by sensor indices s1 and s2).
+ *
+ * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
+ * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
+ *
+ * If a negative value is stored in any of the referenced registers, this value
+ * reflects an error code which will be returned.
+ */
+static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
+{
+ u8 s1 = (index >> 24) & 0xff;
+ u8 s2 = (index >> 16) & 0xff;
+ u8 reg = (index >> 8) & 0xff;
+ u8 mask = index & 0xff;
+ int status;
+ u8 regval;
+
+ status = data->status[reg];
+ if (status < 0)
+ return status;
+
+ regval = status & mask;
+ if (!s1 && !s2)
+ *val = !!regval;
+ else {
+ int v1, v2;
+ struct pmbus_sensor *sensor1, *sensor2;
+
+ sensor1 = &data->sensors[s1];
+ if (sensor1->data < 0)
+ return sensor1->data;
+ sensor2 = &data->sensors[s2];
+ if (sensor2->data < 0)
+ return sensor2->data;
+
+ v1 = pmbus_reg2data(data, sensor1);
+ v2 = pmbus_reg2data(data, sensor2);
+ *val = !!(regval && v1 >= v2);
+ }
+ return 0;
+}
+
+static ssize_t pmbus_show_boolean(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);
+ int val;
+ int err;
+
+ err = pmbus_get_boolean(data, attr->index, &val);
+ if (err)
+ return err;
+ return snprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
+static ssize_t pmbus_show_sensor(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);
+ struct pmbus_sensor *sensor;
+
+ sensor = &data->sensors[attr->index];
+ if (sensor->data < 0)
+ return sensor->data;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", pmbus_reg2data(data, sensor));
+}
+
+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 idx)
+{
+ 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, idx);
+ 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++;
+}
+
+static const int pmbus_temp_registers[] = {
+ PMBUS_READ_TEMPERATURE_1,
+ PMBUS_READ_TEMPERATURE_2,
+ PMBUS_READ_TEMPERATURE_3
+};
+
+static const int pmbus_fan_registers[] = {
+ PMBUS_READ_FAN_SPEED_1,
+ PMBUS_READ_FAN_SPEED_2,
+ PMBUS_READ_FAN_SPEED_3,
+ PMBUS_READ_FAN_SPEED_4
+};
+
+static const int pmbus_fan_config_registers[] = {
+ PMBUS_FAN_CONFIG_12,
+ PMBUS_FAN_CONFIG_12,
+ PMBUS_FAN_CONFIG_34,
+ PMBUS_FAN_CONFIG_34
+};
+
+static const int pmbus_fan_status_registers[] = {
+ PMBUS_STATUS_FAN_12,
+ PMBUS_STATUS_FAN_12,
+ PMBUS_STATUS_FAN_34,
+ PMBUS_STATUS_FAN_34
+};
+
+/*
+ * 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)
+{
+ const struct pmbus_driver_info *info = data->info;
+ int page, max_sensors, max_booleans, max_labels;
+
+ max_sensors = PMBUS_MAX_INPUT_SENSORS;
+ max_booleans = PMBUS_MAX_INPUT_BOOLEANS;
+ max_labels = PMBUS_MAX_INPUT_LABELS;
+
+ for (page = 0; page < info->pages; page++) {
+ if (info->func[page] & PMBUS_HAVE_VOUT) {
+ max_sensors += PMBUS_VOUT_SENSORS_PER_PAGE;
+ max_booleans += PMBUS_VOUT_BOOLEANS_PER_PAGE;
+ max_labels++;
+ }
+ if (info->func[page] & PMBUS_HAVE_IOUT) {
+ max_sensors += PMBUS_IOUT_SENSORS_PER_PAGE;
+ max_booleans += PMBUS_IOUT_BOOLEANS_PER_PAGE;
+ max_labels++;
+ }
+ if (info->func[page] & PMBUS_HAVE_POUT) {
+ max_sensors += PMBUS_POUT_SENSORS_PER_PAGE;
+ max_booleans += PMBUS_POUT_BOOLEANS_PER_PAGE;
+ max_labels++;
+ }
+ if (info->func[page] & PMBUS_HAVE_FAN12) {
+ if (page == 0) {
+ max_sensors +=
+ ARRAY_SIZE(pmbus_fan_registers) *
+ PMBUS_MAX_SENSORS_PER_FAN;
+ max_booleans +=
+ ARRAY_SIZE(pmbus_fan_registers) *
+ PMBUS_MAX_BOOLEANS_PER_FAN;
+ } else {
+ max_sensors += PMBUS_MAX_SENSORS_PER_FAN;
+ max_booleans += PMBUS_MAX_BOOLEANS_PER_FAN;
+ }
+ }
+ if (info->func[page] & PMBUS_HAVE_TEMP) {
+ if (page == 0) {
+ max_sensors +=
+ ARRAY_SIZE(pmbus_temp_registers) *
+ PMBUS_MAX_SENSORS_PER_TEMP;
+ max_booleans +=
+ ARRAY_SIZE(pmbus_temp_registers) *
+ PMBUS_MAX_BOOLEANS_PER_TEMP;
+ } else {
+ 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)
+{
+ const struct pmbus_driver_info *info = data->info;
+ int page, i0, i1, in_index;
+
+ /*
+ * Input voltage sensors
+ */
+ in_index = 1;
+ if (info->func[0] & PMBUS_HAVE_VIN) {
+ bool have_alarm = false;
+
+ 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_IN, 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_IN, false);
+ if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
+ pmbus_add_boolean_reg(data, "in", "min_alarm",
+ in_index,
+ PB_STATUS_INPUT_BASE,
+ PB_VOLTAGE_UV_WARNING);
+ have_alarm = true;
+ }
+ }
+ 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_IN, false);
+ if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
+ pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
+ in_index,
+ PB_STATUS_INPUT_BASE,
+ PB_VOLTAGE_UV_FAULT);
+ have_alarm = true;
+ }
+ }
+ 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_IN, false);
+ if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
+ pmbus_add_boolean_reg(data, "in", "max_alarm",
+ in_index,
+ PB_STATUS_INPUT_BASE,
+ PB_VOLTAGE_OV_WARNING);
+ have_alarm = true;
+ }
+ }
+ 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_IN, false);
+ if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
+ pmbus_add_boolean_reg(data, "in", "crit_alarm",
+ in_index,
+ PB_STATUS_INPUT_BASE,
+ PB_VOLTAGE_OV_FAULT);
+ have_alarm = true;
+ }
+ }
+ /*
+ * Add generic alarm attribute only if there are no individual
+ * attributes.
+ */
+ if (!have_alarm)
+ pmbus_add_boolean_reg(data, "in", "alarm",
+ in_index,
+ PB_STATUS_BASE,
+ PB_STATUS_VIN_UV);
+ in_index++;
+ }
+ if (info->func[0] & PMBUS_HAVE_VCAP) {
+ pmbus_add_label(data, "in", in_index, "vcap", 0);
+ pmbus_add_sensor(data, "in", "input", in_index, 0,
+ PMBUS_READ_VCAP, PSC_VOLTAGE_IN, true);
+ in_index++;
+ }
+
+ /*
+ * Output voltage sensors
+ */
+ for (page = 0; page < info->pages; page++) {
+ bool have_alarm = false;
+
+ if (!(info->func[page] & PMBUS_HAVE_VOUT))
+ continue;
+
+ i0 = data->num_sensors;
+ pmbus_add_label(data, "in", in_index, "vout", page + 1);
+ pmbus_add_sensor(data, "in", "input", in_index, page,
+ PMBUS_READ_VOUT, PSC_VOLTAGE_OUT, true);
+ if (pmbus_check_word_register(client, page,
+ PMBUS_VOUT_UV_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "min", in_index, page,
+ PMBUS_VOUT_UV_WARN_LIMIT,
+ PSC_VOLTAGE_OUT, false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
+ pmbus_add_boolean_reg(data, "in", "min_alarm",
+ in_index,
+ PB_STATUS_VOUT_BASE +
+ page,
+ PB_VOLTAGE_UV_WARNING);
+ have_alarm = true;
+ }
+ }
+ if (pmbus_check_word_register(client, page,
+ PMBUS_VOUT_UV_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "lcrit", in_index, page,
+ PMBUS_VOUT_UV_FAULT_LIMIT,
+ PSC_VOLTAGE_OUT, false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
+ pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
+ in_index,
+ PB_STATUS_VOUT_BASE +
+ page,
+ PB_VOLTAGE_UV_FAULT);
+ have_alarm = true;
+ }
+ }
+ if (pmbus_check_word_register(client, page,
+ PMBUS_VOUT_OV_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "max", in_index, page,
+ PMBUS_VOUT_OV_WARN_LIMIT,
+ PSC_VOLTAGE_OUT, false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
+ pmbus_add_boolean_reg(data, "in", "max_alarm",
+ in_index,
+ PB_STATUS_VOUT_BASE +
+ page,
+ PB_VOLTAGE_OV_WARNING);
+ have_alarm = true;
+ }
+ }
+ if (pmbus_check_word_register(client, page,
+ PMBUS_VOUT_OV_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "in", "crit", in_index, page,
+ PMBUS_VOUT_OV_FAULT_LIMIT,
+ PSC_VOLTAGE_OUT, false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
+ pmbus_add_boolean_reg(data, "in", "crit_alarm",
+ in_index,
+ PB_STATUS_VOUT_BASE +
+ page,
+ PB_VOLTAGE_OV_FAULT);
+ have_alarm = true;
+ }
+ }
+ /*
+ * Add generic alarm attribute only if there are no individual
+ * attributes.
+ */
+ if (!have_alarm)
+ pmbus_add_boolean_reg(data, "in", "alarm",
+ in_index,
+ PB_STATUS_BASE + page,
+ PB_STATUS_VOUT_OV);
+ in_index++;
+ }
+
+ /*
+ * Current sensors
+ */
+
+ /*
+ * Input current sensors
+ */
+ in_index = 1;
+ if (info->func[0] & PMBUS_HAVE_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_IN, 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_IN, false);
+ if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
+ pmbus_add_boolean_reg(data, "curr", "max_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_IN, false);
+ if (info->func[0] & PMBUS_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 (page = 0; page < info->pages; page++) {
+ bool have_alarm = false;
+
+ if (!(info->func[page] & PMBUS_HAVE_IOUT))
+ continue;
+
+ i0 = data->num_sensors;
+ pmbus_add_label(data, "curr", in_index, "iout", page + 1);
+ pmbus_add_sensor(data, "curr", "input", in_index, page,
+ PMBUS_READ_IOUT, PSC_CURRENT_OUT, true);
+ if (pmbus_check_word_register(client, page,
+ PMBUS_IOUT_OC_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "curr", "max", in_index, page,
+ PMBUS_IOUT_OC_WARN_LIMIT,
+ PSC_CURRENT_OUT, false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
+ pmbus_add_boolean_reg(data, "curr", "max_alarm",
+ in_index,
+ PB_STATUS_IOUT_BASE +
+ page, PB_IOUT_OC_WARNING);
+ have_alarm = true;
+ }
+ }
+ if (pmbus_check_word_register(client, page,
+ PMBUS_IOUT_UC_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "curr", "lcrit", in_index, page,
+ PMBUS_IOUT_UC_FAULT_LIMIT,
+ PSC_CURRENT_OUT, false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
+ pmbus_add_boolean_reg(data, "curr",
+ "lcrit_alarm",
+ in_index,
+ PB_STATUS_IOUT_BASE +
+ page, PB_IOUT_UC_FAULT);
+ have_alarm = true;
+ }
+ }
+ if (pmbus_check_word_register(client, page,
+ PMBUS_IOUT_OC_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "curr", "crit", in_index, page,
+ PMBUS_IOUT_OC_FAULT_LIMIT,
+ PSC_CURRENT_OUT, false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
+ pmbus_add_boolean_reg(data, "curr",
+ "crit_alarm",
+ in_index,
+ PB_STATUS_IOUT_BASE +
+ page, PB_IOUT_OC_FAULT);
+ have_alarm = true;
+ }
+ }
+ /*
+ * Add generic alarm attribute only if there are no individual
+ * attributes.
+ */
+ if (!have_alarm)
+ pmbus_add_boolean_reg(data, "curr", "alarm",
+ in_index,
+ PB_STATUS_BASE + page,
+ PB_STATUS_IOUT_OC);
+ in_index++;
+ }
+
+ /*
+ * Power sensors
+ */
+ /*
+ * Input Power sensors
+ */
+ in_index = 1;
+ if (info->func[0] & PMBUS_HAVE_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 (info->func[0] & PMBUS_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 (page = 0; page < info->pages; page++) {
+ bool need_alarm = false;
+
+ if (!(info->func[page] & PMBUS_HAVE_POUT))
+ continue;
+
+ i0 = data->num_sensors;
+ pmbus_add_label(data, "power", in_index, "pout", page + 1);
+ pmbus_add_sensor(data, "power", "input", in_index, page,
+ 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, page, PMBUS_POUT_MAX)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "power", "cap", in_index, page,
+ PMBUS_POUT_MAX, PSC_POWER, false);
+ need_alarm = true;
+ }
+ if (pmbus_check_word_register(client, page,
+ PMBUS_POUT_OP_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "power", "max", in_index, page,
+ PMBUS_POUT_OP_WARN_LIMIT, PSC_POWER,
+ false);
+ need_alarm = true;
+ }
+ if (need_alarm && (info->func[page] & PMBUS_HAVE_STATUS_IOUT))
+ pmbus_add_boolean_reg(data, "power", "alarm",
+ in_index,
+ PB_STATUS_IOUT_BASE + page,
+ PB_POUT_OP_WARNING
+ | PB_POWER_LIMITING);
+
+ if (pmbus_check_word_register(client, page,
+ PMBUS_POUT_OP_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "power", "crit", in_index, page,
+ PMBUS_POUT_OP_FAULT_LIMIT, PSC_POWER,
+ false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_IOUT)
+ pmbus_add_boolean_reg(data, "power",
+ "crit_alarm",
+ in_index,
+ PB_STATUS_IOUT_BASE
+ + page,
+ PB_POUT_OP_FAULT);
+ }
+ in_index++;
+ }
+
+ /*
+ * Temperature sensors
+ */
+ in_index = 1;
+ for (page = 0; page < info->pages; page++) {
+ int t, temps;
+
+ if (!(info->func[page] & PMBUS_HAVE_TEMP))
+ continue;
+
+ temps = page ? 1 : ARRAY_SIZE(pmbus_temp_registers);
+ for (t = 0; t < temps; t++) {
+ bool have_alarm = false;
+
+ if (!pmbus_check_word_register
+ (client, page, pmbus_temp_registers[t]))
+ break;
+
+ i0 = data->num_sensors;
+ pmbus_add_sensor(data, "temp", "input", in_index, page,
+ pmbus_temp_registers[t],
+ PSC_TEMPERATURE, true);
+
+ /*
+ * PMBus provides only one status register for TEMP1-3.
+ * Thus, we can not use the status register to determine
+ * which of the three 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, page, PMBUS_UT_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "temp", "min", in_index,
+ page, PMBUS_UT_WARN_LIMIT,
+ PSC_TEMPERATURE, false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
+ pmbus_add_boolean_cmp(data, "temp",
+ "min_alarm", in_index, i1, i0,
+ PB_STATUS_TEMP_BASE + page,
+ PB_TEMP_UT_WARNING);
+ have_alarm = true;
+ }
+ }
+ if (pmbus_check_word_register(client, page,
+ PMBUS_UT_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "temp", "lcrit",
+ in_index, page,
+ PMBUS_UT_FAULT_LIMIT,
+ PSC_TEMPERATURE, false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
+ pmbus_add_boolean_cmp(data, "temp",
+ "lcrit_alarm", in_index, i1, i0,
+ PB_STATUS_TEMP_BASE + page,
+ PB_TEMP_UT_FAULT);
+ have_alarm = true;
+ }
+ }
+ if (pmbus_check_word_register
+ (client, page, PMBUS_OT_WARN_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "temp", "max", in_index,
+ page, PMBUS_OT_WARN_LIMIT,
+ PSC_TEMPERATURE, false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
+ pmbus_add_boolean_cmp(data, "temp",
+ "max_alarm", in_index, i0, i1,
+ PB_STATUS_TEMP_BASE + page,
+ PB_TEMP_OT_WARNING);
+ have_alarm = true;
+ }
+ }
+ if (pmbus_check_word_register(client, page,
+ PMBUS_OT_FAULT_LIMIT)) {
+ i1 = data->num_sensors;
+ pmbus_add_sensor(data, "temp", "crit", in_index,
+ page, PMBUS_OT_FAULT_LIMIT,
+ PSC_TEMPERATURE, false);
+ if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
+ pmbus_add_boolean_cmp(data, "temp",
+ "crit_alarm", in_index, i0, i1,
+ PB_STATUS_TEMP_BASE + page,
+ PB_TEMP_OT_FAULT);
+ have_alarm = true;
+ }
+ }
+ /*
+ * Last resort - we were not able to create any alarm
+ * registers. Report alarm for all sensors using the
+ * status register temperature alarm bit.
+ */
+ if (!have_alarm)
+ pmbus_add_boolean_reg(data, "temp", "alarm",
+ in_index,
+ PB_STATUS_BASE + page,
+ PB_STATUS_TEMPERATURE);
+ in_index++;
+ }
+ }
+
+ /*
+ * Fans
+ */
+ in_index = 1;
+ for (page = 0; page < info->pages; page++) {
+ int fans, f;
+
+ if (!(info->func[page] & PMBUS_HAVE_FAN12))
+ continue;
+
+ fans = page ? 1 : ARRAY_SIZE(pmbus_fan_registers);
+ for (f = 0; f < fans; f++) {
+ int regval;
+
+ if (!pmbus_check_word_register(client, page,
+ pmbus_fan_registers[f])
+ || !pmbus_check_byte_register(client, page,
+ pmbus_fan_config_registers[f]))
+ break;
+
+ /*
+ * Skip fan if not installed.
+ * Each fan configuration register covers multiple fans,
+ * so we have to do some magic.
+ */
+ regval = pmbus_read_byte_data(client, page,
+ pmbus_fan_config_registers[f]);
+ if (regval < 0 ||
+ (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
+ continue;
+
+ i0 = data->num_sensors;
+ pmbus_add_sensor(data, "fan", "input", in_index, page,
+ pmbus_fan_registers[f], PSC_FAN, true);
+
+ /*
+ * Each fan status register covers multiple fans,
+ * so we have to do some magic.
+ */
+ if (pmbus_check_byte_register
+ (client, page, pmbus_fan_status_registers[f])) {
+ int base;
+
+ if (f > 1) /* fan 3, 4 */
+ base = PB_STATUS_FAN34_BASE;
+ else
+ base = PB_STATUS_FAN_BASE + page;
+ pmbus_add_boolean_reg(data, "fan", "alarm",
+ in_index, base,
+ PB_FAN_FAN1_WARNING >> (f & 1));
+ pmbus_add_boolean_reg(data, "fan", "fault",
+ in_index, base,
+ PB_FAN_FAN1_FAULT >> (f & 1));
+ }
+ in_index++;
+ }
+ }
+}
+
+/*
+ * Identify chip parameters.
+ * This function is called for all chips.
+ */
+static int pmbus_identify_common(struct i2c_client *client,
+ struct pmbus_data *data)
+{
+ int vout_mode, exponent;
+
+ vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
+ if (vout_mode >= 0) {
+ /*
+ * Not all chips support the VOUT_MODE command,
+ * so a failure to read it is not an error.
+ */
+ switch (vout_mode >> 5) {
+ case 0: /* linear mode */
+ if (data->info->direct[PSC_VOLTAGE_OUT])
+ return -ENODEV;
+
+ exponent = vout_mode & 0x1f;
+ /* and sign-extend it */
+ if (exponent & 0x10)
+ exponent |= ~0x1f;
+ data->exponent = exponent;
+ break;
+ case 2: /* direct mode */
+ if (!data->info->direct[PSC_VOLTAGE_OUT])
+ return -ENODEV;
+ break;
+ default:
+ return -ENODEV;
+ }
+ }
+
+ /* Determine maximum number of sensors, booleans, and labels */
+ pmbus_find_max_attr(client, data);
+ pmbus_clear_fault_page(client, 0);
+ return 0;
+}
+
+int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
+ struct pmbus_driver_info *info)
+{
+ const struct pmbus_platform_data *pdata = client->dev.platform_data;
+ struct pmbus_data *data;
+ int ret;
+
+ if (!info) {
+ dev_err(&client->dev, "Missing chip information");
+ return -ENODEV;
+ }
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
+ | I2C_FUNC_SMBUS_BYTE_DATA
+ | I2C_FUNC_SMBUS_WORD_DATA))
+ return -ENODEV;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ dev_err(&client->dev, "No memory to allocate driver data\n");
+ return -ENOMEM;
+ }
+
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
+
+ /*
+ * Bail out if status register or PMBus revision register
+ * does not exist.
+ */
+ if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0
+ || i2c_smbus_read_byte_data(client, PMBUS_REVISION) < 0) {
+ dev_err(&client->dev,
+ "Status or revision register not found\n");
+ ret = -ENODEV;
+ goto out_data;
+ }
+
+ if (pdata)
+ data->flags = pdata->flags;
+ data->info = info;
+
+ pmbus_clear_faults(client);
+
+ if (info->identify) {
+ ret = (*info->identify)(client, info);
+ if (ret < 0) {
+ dev_err(&client->dev, "Chip identification failed\n");
+ goto out_data;
+ }
+ }
+
+ if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
+ dev_err(&client->dev, "Bad number of PMBus pages: %d\n",
+ info->pages);
+ ret = -EINVAL;
+ goto out_data;
+ }
+ /*
+ * 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 (info->pages > 1 && pmbus_set_page(client, info->pages - 1) < 0) {
+ dev_err(&client->dev, "Failed to select page %d\n",
+ info->pages - 1);
+ ret = -EINVAL;
+ goto out_data;
+ }
+
+ ret = pmbus_identify_common(client, data);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to identify chip capabilities\n");
+ goto out_data;
+ }
+
+ ret = -ENOMEM;
+ data->sensors = kzalloc(sizeof(struct pmbus_sensor) * data->max_sensors,
+ GFP_KERNEL);
+ if (!data->sensors) {
+ dev_err(&client->dev, "No memory to allocate sensor data\n");
+ goto out_data;
+ }
+
+ data->booleans = kzalloc(sizeof(struct pmbus_boolean)
+ * data->max_booleans, GFP_KERNEL);
+ if (!data->booleans) {
+ dev_err(&client->dev, "No memory to allocate boolean data\n");
+ goto out_sensors;
+ }
+
+ data->labels = kzalloc(sizeof(struct pmbus_label) * data->max_labels,
+ GFP_KERNEL);
+ if (!data->labels) {
+ dev_err(&client->dev, "No memory to allocate label data\n");
+ goto out_booleans;
+ }
+
+ data->attributes = kzalloc(sizeof(struct attribute *)
+ * data->max_attributes, GFP_KERNEL);
+ if (!data->attributes) {
+ dev_err(&client->dev, "No memory to allocate attribute data\n");
+ 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) {
+ dev_err(&client->dev, "No attributes found\n");
+ ret = -ENODEV;
+ goto out_attributes;
+ }
+
+ /* Register sysfs hooks */
+ data->group.attrs = data->attributes;
+ ret = sysfs_create_group(&client->dev.kobj, &data->group);
+ if (ret) {
+ dev_err(&client->dev, "Failed to create sysfs entries\n");
+ goto out_attributes;
+ }
+ data->hwmon_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ ret = PTR_ERR(data->hwmon_dev);
+ dev_err(&client->dev, "Failed to register hwmon device\n");
+ 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);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(pmbus_do_probe);
+
+int pmbus_do_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;
+}
+EXPORT_SYMBOL_GPL(pmbus_do_remove);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus core driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/i2c/pmbus.h b/include/linux/i2c/pmbus.h
new file mode 100644
index 0000000..69280db
--- /dev/null
+++ b/include/linux/i2c/pmbus.h
@@ -0,0 +1,45 @@
+/*
+ * Hardware monitoring driver for PMBus devices
+ *
+ * Copyright (c) 2010, 2011 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_
+
+/* flags */
+
+/*
+ * PMBUS_SKIP_STATUS_CHECK
+ *
+ * During register detection, skip checking the status register for
+ * communication or command errors.
+ *
+ * Some PMBus chips respond with valid data when trying to read an unsupported
+ * register. For such chips, checking the status register is mandatory when
+ * trying to determine if a chip register exists or not.
+ * Other PMBus chips don't support the STATUS_CML register, or report
+ * communication errors for no explicable reason. For such chips, checking
+ * the status register must be disabled.
+ */
+#define PMBUS_SKIP_STATUS_CHECK (1 << 0)
+
+struct pmbus_platform_data {
+ u32 flags; /* Device specific flags */
+};
+
+#endif /* _PMBUS_H_ */
--
1.7.3.1


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