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Subject[PATCH v5 1/3] hwmon: Driver for SMM665 Six-Channel Active DC Output Controller/Monitor
Date
This driver adds support for the monitoring features of the Summit
Microelectronics SMM665 Six-Channel Active DC Output Controller/Monitor.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
---
drivers/hwmon/Kconfig | 15 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/smm665.c | 743 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 759 insertions(+), 0 deletions(-)
create mode 100644 drivers/hwmon/smm665.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index e19cf8e..c45c17e 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -739,6 +739,21 @@ config SENSORS_SIS5595
This driver can also be built as a module. If so, the module
will be called sis5595.

+config SENSORS_SMM665
+ tristate "Summit Microelectronics SMM665"
+ depends on I2C && EXPERIMENTAL
+ default n
+ help
+ If you say yes here you get support for the hardware monitoring
+ features of the Summit Microelectronics SMM665/SMM665B Six-Channel
+ Active DC Output Controller / Monitor.
+
+ Other supported chips are SMM465, SMM665C, SMM764, and SMM766.
+ Support for those chips is untested.
+
+ This driver can also be built as a module. If so, the module will
+ be called smm665.
+
config SENSORS_DME1737
tristate "SMSC DME1737, SCH311x and compatibles"
depends on I2C && EXPERIMENTAL
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 2138ceb..55b0940 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -86,6 +86,7 @@ obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
obj-$(CONFIG_SENSORS_S3C) += s3c-hwmon.o
obj-$(CONFIG_SENSORS_SHT15) += sht15.o
obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o
+obj-$(CONFIG_SENSORS_SMM665) += smm665.o
obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o
obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
diff --git a/drivers/hwmon/smm665.c b/drivers/hwmon/smm665.c
new file mode 100644
index 0000000..fa0900c
--- /dev/null
+++ b/drivers/hwmon/smm665.c
@@ -0,0 +1,743 @@
+/*
+ * Driver for SMM665 Power Controller / Monitor
+ *
+ * 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; version 2 of the License.
+ *
+ * This driver should also work for SMM465, SMM764, and SMM766, but is untested
+ * for those chips. Only monitoring functionality is implemented.
+ *
+ * Datasheets:
+ * http://www.summitmicro.com/prod_select/summary/SMM665/SMM665B_2089_20.pdf
+ * http://www.summitmicro.com/prod_select/summary/SMM766B/SMM766B_2122.pdf
+ */
+
+#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>
+
+/* Internal reference voltage (VREF, x 1000 */
+#define SMM665_VREF_ADC_X1000 1250
+
+/* module parameters */
+static int vref = SMM665_VREF_ADC_X1000;
+module_param(vref, int, 0);
+MODULE_PARM_DESC(vref, "Reference voltage in mV");
+
+enum chips { smm465, smm665, smm665c, smm764, smm766 };
+
+/*
+ * ADC channel addresses
+ */
+#define SMM665_MISC16_ADC_DATA_A 0x00
+#define SMM665_MISC16_ADC_DATA_B 0x01
+#define SMM665_MISC16_ADC_DATA_C 0x02
+#define SMM665_MISC16_ADC_DATA_D 0x03
+#define SMM665_MISC16_ADC_DATA_E 0x04
+#define SMM665_MISC16_ADC_DATA_F 0x05
+#define SMM665_MISC16_ADC_DATA_VDD 0x06
+#define SMM665_MISC16_ADC_DATA_12V 0x07
+#define SMM665_MISC16_ADC_DATA_INT_TEMP 0x08
+#define SMM665_MISC16_ADC_DATA_AIN1 0x09
+#define SMM665_MISC16_ADC_DATA_AIN2 0x0a
+
+/*
+ * Command registers
+ */
+#define SMM665_MISC8_CMD_STS 0x80
+#define SMM665_MISC8_STATUS1 0x81
+#define SMM665_MISC8_STATUSS2 0x82
+#define SMM665_MISC8_IO_POLARITY 0x83
+#define SMM665_MISC8_PUP_POLARITY 0x84
+#define SMM665_MISC8_ADOC_STATUS1 0x85
+#define SMM665_MISC8_ADOC_STATUS2 0x86
+#define SMM665_MISC8_WRITE_PROT 0x87
+#define SMM665_MISC8_STS_TRACK 0x88
+
+/*
+ * Configuration registers and register groups
+ */
+#define SMM665_ADOC_ENABLE 0x0d
+#define SMM665_LIMIT_BASE 0x80 /* First limit register */
+
+/*
+ * Limit register bit masks
+ */
+#define SMM665_TRIGGER_RST 0x8000
+#define SMM665_TRIGGER_HEALTHY 0x4000
+#define SMM665_TRIGGER_POWEROFF 0x2000
+#define SMM665_TRIGGER_SHUTDOWN 0x1000
+#define SMM665_ADC_MASK 0x03ff
+
+#define smm665_is_critical(lim) ((lim) & (SMM665_TRIGGER_RST \
+ | SMM665_TRIGGER_POWEROFF \
+ | SMM665_TRIGGER_SHUTDOWN))
+/*
+ * Fault register bit definitions
+ * Values are merged from status registers 1/2,
+ * with status register 1 providing the upper 8 bits.
+ */
+#define SMM665_FAULT_A 0x0001
+#define SMM665_FAULT_B 0x0002
+#define SMM665_FAULT_C 0x0004
+#define SMM665_FAULT_D 0x0008
+#define SMM665_FAULT_E 0x0010
+#define SMM665_FAULT_F 0x0020
+#define SMM665_FAULT_VDD 0x0040
+#define SMM665_FAULT_12V 0x0080
+#define SMM665_FAULT_TEMP 0x0100
+#define SMM665_FAULT_AIN1 0x0200
+#define SMM665_FAULT_AIN2 0x0400
+
+/*
+ * I2C Register addresses
+ *
+ * The configuration register needs to be the configured base register.
+ * The command/status register address is derived from it.
+ */
+#define SMM665_REGMASK 0x78
+#define SMM665_CMDREG_BASE 0x48
+#define SMM665_CONFREG_BASE 0x50
+
+/*
+ * Equations given by chip manufacturer to calculate voltage/temperature values
+ * vref = Reference voltage on VREF_ADC pin (module parameter)
+ * adc = 10bit ADC value read back from registers
+ */
+
+/* Voltage A-F and VDD */
+#define SMM665_VMON_ADC_TO_VOLTS(adc) ((adc) * vref / 256)
+
+/* Voltage 12VIN */
+#define SMM665_12VIN_ADC_TO_VOLTS(adc) ((adc) * vref * 3 / 256)
+
+/* Voltage AIN1, AIN2 */
+#define SMM665_AIN_ADC_TO_VOLTS(adc) ((adc) * vref / 512)
+
+/* Temp Sensor */
+#define SMM665_TEMP_ADC_TO_CELSIUS(adc) ((adc) <= 511) ? \
+ ((int)(adc) * 1000 / 4) : \
+ (((int)(adc) - 0x400) * 1000 / 4)
+
+#define SMM665_NUM_ADC 11
+
+/*
+ * Chip dependent ADC conversion time, in uS
+ */
+#define SMM665_ADC_WAIT_SMM665 70
+#define SMM665_ADC_WAIT_SMM766 185
+
+struct smm665_data {
+ enum chips type;
+ int conversion_time; /* ADC conversion time */
+ struct device *hwmon_dev;
+ struct mutex update_lock;
+ bool valid;
+ unsigned long last_updated; /* in jiffies */
+ u16 adc[SMM665_NUM_ADC]; /* adc values (raw) */
+ u16 faults; /* fault status */
+ /* The following values are in mV */
+ int critical_min_limit[SMM665_NUM_ADC];
+ int alarm_min_limit[SMM665_NUM_ADC];
+ int critical_max_limit[SMM665_NUM_ADC];
+ int alarm_max_limit[SMM665_NUM_ADC];
+ struct i2c_client *cmdreg;
+};
+
+/*
+ * smm665_read16()
+ *
+ * Read 16 bit value from <reg>, <reg+1>. Upper 8 bits are in <reg>.
+ */
+static int smm665_read16(struct i2c_client *client, int reg)
+{
+ int rv, val;
+
+ rv = i2c_smbus_read_byte_data(client, reg);
+ if (rv < 0)
+ return rv;
+ val = rv << 8;
+ rv = i2c_smbus_read_byte_data(client, reg + 1);
+ if (rv < 0)
+ return rv;
+ val |= rv;
+ return val;
+}
+
+/*
+ * Read adc value.
+ */
+static int smm665_read_adc(struct smm665_data *data, int adc)
+{
+ struct i2c_client *client = data->cmdreg;
+ int rv;
+ int radc;
+
+ /*
+ * Algorithm for reading ADC, per SMM665 datasheet
+ *
+ * {[S][addr][W][Ack]} {[offset][Ack]} {[S][addr][R][Nack]}
+ * [wait conversion time]
+ * {[S][addr][R][Ack]} {[datahi][Ack]} {[datalo][Ack][P]}
+ *
+ * To implement the first part of this exchange,
+ * do a full read transaction and expect a failure/Nack.
+ * This sets up the address pointer on the SMM665
+ * and starts the ADC conversion.
+ * Then do a two-byte read transaction.
+ */
+ rv = i2c_smbus_read_byte_data(client, adc << 3);
+ if (rv != -ENXIO) {
+ /*
+ * We expect ENXIO to reflect NACK
+ * (per Documentation/i2c/fault-codes).
+ * Everything else is an error.
+ */
+ dev_dbg(&client->dev,
+ "Unexpected return code %d when setting ADC index", rv);
+ return (rv < 0) ? rv : -EIO;
+ }
+
+ udelay(data->conversion_time);
+
+ /*
+ * Now read two bytes.
+ *
+ * Neither i2c_smbus_read_byte() nor
+ * i2c_smbus_read_block_data() worked here,
+ * so use i2c_smbus_read_word_data() instead.
+ * We could also try to use i2c_master_recv(),
+ * but that is not always supported.
+ */
+ rv = i2c_smbus_read_word_data(client, 0);
+ if (rv < 0) {
+ dev_dbg(&client->dev, "Failed to read ADC value: error %d", rv);
+ return -1;
+ }
+ /*
+ * Validate/verify readback adc channel (in bit 11..14).
+ * High byte is in lower 8 bit of rv, so only shift by 3.
+ */
+ radc = (rv >> 3) & 0x0f;
+ if (radc != adc) {
+ dev_dbg(&client->dev, "Unexpected RADC: Expected %d got %d",
+ adc, radc);
+ return -EIO;
+ }
+ /*
+ * Chip replies with H/L, while SMBus expects L/H.
+ * Thus, byte order is reversed, and we have to swap
+ * the result.
+ */
+ rv = swab16(rv) & SMM665_ADC_MASK;
+
+ return rv;
+}
+
+static struct smm665_data *smm665_update_device(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct smm665_data *data = i2c_get_clientdata(client);
+ struct smm665_data *ret = data;
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+ int i, val;
+
+ /*
+ * read status registers
+ */
+ val = smm665_read16(client, SMM665_MISC8_STATUS1);
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->faults = val;
+
+ /* Read adc registers */
+ for (i = 0; i < SMM665_NUM_ADC; i++) {
+ val = smm665_read_adc(data, i);
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->adc[i] = val;
+ }
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+abort:
+ mutex_unlock(&data->update_lock);
+ return ret;
+}
+
+/* Return converted value from given adc */
+static int smm665_convert(u16 adcval, int index)
+{
+ int val = 0;
+
+ switch (index) {
+ case SMM665_MISC16_ADC_DATA_12V:
+ val = SMM665_12VIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
+ break;
+
+ case SMM665_MISC16_ADC_DATA_VDD:
+ case SMM665_MISC16_ADC_DATA_A:
+ case SMM665_MISC16_ADC_DATA_B:
+ case SMM665_MISC16_ADC_DATA_C:
+ case SMM665_MISC16_ADC_DATA_D:
+ case SMM665_MISC16_ADC_DATA_E:
+ case SMM665_MISC16_ADC_DATA_F:
+ val = SMM665_VMON_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
+ break;
+
+ case SMM665_MISC16_ADC_DATA_AIN1:
+ case SMM665_MISC16_ADC_DATA_AIN2:
+ val = SMM665_AIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
+ break;
+
+ case SMM665_MISC16_ADC_DATA_INT_TEMP:
+ val = SMM665_TEMP_ADC_TO_CELSIUS(adcval & SMM665_ADC_MASK);
+ break;
+
+ default:
+ /* If we get here, the developer messed up */
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ return val;
+}
+
+static int smm665_get_min(struct device *dev, int index)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct smm665_data *data = i2c_get_clientdata(client);
+
+ return data->alarm_min_limit[index];
+}
+
+static int smm665_get_max(struct device *dev, int index)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct smm665_data *data = i2c_get_clientdata(client);
+
+ return data->alarm_max_limit[index];
+}
+
+static int smm665_get_lcrit(struct device *dev, int index)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct smm665_data *data = i2c_get_clientdata(client);
+
+ return data->critical_min_limit[index];
+}
+
+static int smm665_get_crit(struct device *dev, int index)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct smm665_data *data = i2c_get_clientdata(client);
+
+ return data->critical_max_limit[index];
+}
+
+static ssize_t smm665_show_fault(struct device *dev,
+ struct device_attribute *da, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct smm665_data *data = smm665_update_device(dev);
+ int val = 0;
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ if (data->faults & (1 << attr->index))
+ val = 1;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
+static ssize_t smm665_show_input(struct device *dev,
+ struct device_attribute *da, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct smm665_data *data = smm665_update_device(dev);
+ int adc = attr->index;
+ int val;
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ val = smm665_convert(data->adc[adc], adc);
+ return snprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
+#define SMM665_SHOW(what) \
+ static ssize_t smm665_show_##what(struct device *dev, \
+ struct device_attribute *da, char *buf) \
+{ \
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
+ const int val = smm665_get_##what(dev, attr->index); \
+ return snprintf(buf, PAGE_SIZE, "%d\n", val); \
+}
+
+SMM665_SHOW(min);
+SMM665_SHOW(max);
+SMM665_SHOW(lcrit);
+SMM665_SHOW(crit);
+
+/* These macros are used below in constructing device attribute objects
+ * for use with sysfs_create_group() to make a sysfs device file
+ * for each register.
+ */
+
+#define SMM665_ATTR(name, type, cmd_idx) \
+ static SENSOR_DEVICE_ATTR(name##_##type, S_IRUGO, \
+ smm665_show_##type, NULL, cmd_idx)
+
+/* Construct a sensor_device_attribute structure for each register */
+
+/* Input voltages */
+SMM665_ATTR(in1, input, SMM665_MISC16_ADC_DATA_12V);
+SMM665_ATTR(in2, input, SMM665_MISC16_ADC_DATA_VDD);
+SMM665_ATTR(in3, input, SMM665_MISC16_ADC_DATA_A);
+SMM665_ATTR(in4, input, SMM665_MISC16_ADC_DATA_B);
+SMM665_ATTR(in5, input, SMM665_MISC16_ADC_DATA_C);
+SMM665_ATTR(in6, input, SMM665_MISC16_ADC_DATA_D);
+SMM665_ATTR(in7, input, SMM665_MISC16_ADC_DATA_E);
+SMM665_ATTR(in8, input, SMM665_MISC16_ADC_DATA_F);
+SMM665_ATTR(in9, input, SMM665_MISC16_ADC_DATA_AIN1);
+SMM665_ATTR(in10, input, SMM665_MISC16_ADC_DATA_AIN2);
+
+/* Input voltages min */
+SMM665_ATTR(in1, min, SMM665_MISC16_ADC_DATA_12V);
+SMM665_ATTR(in2, min, SMM665_MISC16_ADC_DATA_VDD);
+SMM665_ATTR(in3, min, SMM665_MISC16_ADC_DATA_A);
+SMM665_ATTR(in4, min, SMM665_MISC16_ADC_DATA_B);
+SMM665_ATTR(in5, min, SMM665_MISC16_ADC_DATA_C);
+SMM665_ATTR(in6, min, SMM665_MISC16_ADC_DATA_D);
+SMM665_ATTR(in7, min, SMM665_MISC16_ADC_DATA_E);
+SMM665_ATTR(in8, min, SMM665_MISC16_ADC_DATA_F);
+SMM665_ATTR(in9, min, SMM665_MISC16_ADC_DATA_AIN1);
+SMM665_ATTR(in10, min, SMM665_MISC16_ADC_DATA_AIN2);
+
+/* Input voltages max */
+SMM665_ATTR(in1, max, SMM665_MISC16_ADC_DATA_12V);
+SMM665_ATTR(in2, max, SMM665_MISC16_ADC_DATA_VDD);
+SMM665_ATTR(in3, max, SMM665_MISC16_ADC_DATA_A);
+SMM665_ATTR(in4, max, SMM665_MISC16_ADC_DATA_B);
+SMM665_ATTR(in5, max, SMM665_MISC16_ADC_DATA_C);
+SMM665_ATTR(in6, max, SMM665_MISC16_ADC_DATA_D);
+SMM665_ATTR(in7, max, SMM665_MISC16_ADC_DATA_E);
+SMM665_ATTR(in8, max, SMM665_MISC16_ADC_DATA_F);
+SMM665_ATTR(in9, max, SMM665_MISC16_ADC_DATA_AIN1);
+SMM665_ATTR(in10, max, SMM665_MISC16_ADC_DATA_AIN2);
+
+/* Input voltages lcrit */
+SMM665_ATTR(in1, lcrit, SMM665_MISC16_ADC_DATA_12V);
+SMM665_ATTR(in2, lcrit, SMM665_MISC16_ADC_DATA_VDD);
+SMM665_ATTR(in3, lcrit, SMM665_MISC16_ADC_DATA_A);
+SMM665_ATTR(in4, lcrit, SMM665_MISC16_ADC_DATA_B);
+SMM665_ATTR(in5, lcrit, SMM665_MISC16_ADC_DATA_C);
+SMM665_ATTR(in6, lcrit, SMM665_MISC16_ADC_DATA_D);
+SMM665_ATTR(in7, lcrit, SMM665_MISC16_ADC_DATA_E);
+SMM665_ATTR(in8, lcrit, SMM665_MISC16_ADC_DATA_F);
+SMM665_ATTR(in9, lcrit, SMM665_MISC16_ADC_DATA_AIN1);
+SMM665_ATTR(in10, lcrit, SMM665_MISC16_ADC_DATA_AIN2);
+
+/* Input voltages crit */
+SMM665_ATTR(in1, crit, SMM665_MISC16_ADC_DATA_12V);
+SMM665_ATTR(in2, crit, SMM665_MISC16_ADC_DATA_VDD);
+SMM665_ATTR(in3, crit, SMM665_MISC16_ADC_DATA_A);
+SMM665_ATTR(in4, crit, SMM665_MISC16_ADC_DATA_B);
+SMM665_ATTR(in5, crit, SMM665_MISC16_ADC_DATA_C);
+SMM665_ATTR(in6, crit, SMM665_MISC16_ADC_DATA_D);
+SMM665_ATTR(in7, crit, SMM665_MISC16_ADC_DATA_E);
+SMM665_ATTR(in8, crit, SMM665_MISC16_ADC_DATA_F);
+SMM665_ATTR(in9, crit, SMM665_MISC16_ADC_DATA_AIN1);
+SMM665_ATTR(in10, crit, SMM665_MISC16_ADC_DATA_AIN2);
+
+/* Faults */
+SMM665_ATTR(in1, fault, SMM665_FAULT_12V);
+SMM665_ATTR(in2, fault, SMM665_FAULT_VDD);
+SMM665_ATTR(in3, fault, SMM665_FAULT_A);
+SMM665_ATTR(in4, fault, SMM665_FAULT_B);
+SMM665_ATTR(in5, fault, SMM665_FAULT_C);
+SMM665_ATTR(in6, fault, SMM665_FAULT_D);
+SMM665_ATTR(in7, fault, SMM665_FAULT_E);
+SMM665_ATTR(in8, fault, SMM665_FAULT_F);
+SMM665_ATTR(in9, fault, SMM665_FAULT_AIN1);
+SMM665_ATTR(in10, fault, SMM665_FAULT_AIN2);
+
+/* Temperature */
+SMM665_ATTR(temp1, input, SMM665_MISC16_ADC_DATA_INT_TEMP);
+SMM665_ATTR(temp1, min, SMM665_MISC16_ADC_DATA_INT_TEMP);
+SMM665_ATTR(temp1, max, SMM665_MISC16_ADC_DATA_INT_TEMP);
+SMM665_ATTR(temp1, lcrit, SMM665_MISC16_ADC_DATA_INT_TEMP);
+SMM665_ATTR(temp1, crit, SMM665_MISC16_ADC_DATA_INT_TEMP);
+SMM665_ATTR(temp1, fault, SMM665_FAULT_TEMP);
+
+/*
+ * Finally, construct an array of pointers to members of the above objects,
+ * as required for sysfs_create_group()
+ */
+static struct attribute *smm665_attributes[] = {
+ &sensor_dev_attr_in1_input.dev_attr.attr,
+ &sensor_dev_attr_in1_min.dev_attr.attr,
+ &sensor_dev_attr_in1_max.dev_attr.attr,
+ &sensor_dev_attr_in1_lcrit.dev_attr.attr,
+ &sensor_dev_attr_in1_crit.dev_attr.attr,
+ &sensor_dev_attr_in1_fault.dev_attr.attr,
+
+ &sensor_dev_attr_in2_input.dev_attr.attr,
+ &sensor_dev_attr_in2_min.dev_attr.attr,
+ &sensor_dev_attr_in2_max.dev_attr.attr,
+ &sensor_dev_attr_in2_lcrit.dev_attr.attr,
+ &sensor_dev_attr_in2_crit.dev_attr.attr,
+ &sensor_dev_attr_in2_fault.dev_attr.attr,
+
+ &sensor_dev_attr_in3_input.dev_attr.attr,
+ &sensor_dev_attr_in3_min.dev_attr.attr,
+ &sensor_dev_attr_in3_max.dev_attr.attr,
+ &sensor_dev_attr_in3_lcrit.dev_attr.attr,
+ &sensor_dev_attr_in3_crit.dev_attr.attr,
+ &sensor_dev_attr_in3_fault.dev_attr.attr,
+
+ &sensor_dev_attr_in4_input.dev_attr.attr,
+ &sensor_dev_attr_in4_min.dev_attr.attr,
+ &sensor_dev_attr_in4_max.dev_attr.attr,
+ &sensor_dev_attr_in4_lcrit.dev_attr.attr,
+ &sensor_dev_attr_in4_crit.dev_attr.attr,
+ &sensor_dev_attr_in4_fault.dev_attr.attr,
+
+ &sensor_dev_attr_in5_input.dev_attr.attr,
+ &sensor_dev_attr_in5_min.dev_attr.attr,
+ &sensor_dev_attr_in5_max.dev_attr.attr,
+ &sensor_dev_attr_in5_lcrit.dev_attr.attr,
+ &sensor_dev_attr_in5_crit.dev_attr.attr,
+ &sensor_dev_attr_in5_fault.dev_attr.attr,
+
+ &sensor_dev_attr_in6_input.dev_attr.attr,
+ &sensor_dev_attr_in6_min.dev_attr.attr,
+ &sensor_dev_attr_in6_max.dev_attr.attr,
+ &sensor_dev_attr_in6_lcrit.dev_attr.attr,
+ &sensor_dev_attr_in6_crit.dev_attr.attr,
+ &sensor_dev_attr_in6_fault.dev_attr.attr,
+
+ &sensor_dev_attr_in7_input.dev_attr.attr,
+ &sensor_dev_attr_in7_min.dev_attr.attr,
+ &sensor_dev_attr_in7_max.dev_attr.attr,
+ &sensor_dev_attr_in7_lcrit.dev_attr.attr,
+ &sensor_dev_attr_in7_crit.dev_attr.attr,
+ &sensor_dev_attr_in7_fault.dev_attr.attr,
+
+ &sensor_dev_attr_in8_input.dev_attr.attr,
+ &sensor_dev_attr_in8_min.dev_attr.attr,
+ &sensor_dev_attr_in8_max.dev_attr.attr,
+ &sensor_dev_attr_in8_lcrit.dev_attr.attr,
+ &sensor_dev_attr_in8_crit.dev_attr.attr,
+ &sensor_dev_attr_in8_fault.dev_attr.attr,
+
+ &sensor_dev_attr_in9_input.dev_attr.attr,
+ &sensor_dev_attr_in9_min.dev_attr.attr,
+ &sensor_dev_attr_in9_max.dev_attr.attr,
+ &sensor_dev_attr_in9_lcrit.dev_attr.attr,
+ &sensor_dev_attr_in9_crit.dev_attr.attr,
+ &sensor_dev_attr_in9_fault.dev_attr.attr,
+
+ &sensor_dev_attr_in10_input.dev_attr.attr,
+ &sensor_dev_attr_in10_min.dev_attr.attr,
+ &sensor_dev_attr_in10_max.dev_attr.attr,
+ &sensor_dev_attr_in10_lcrit.dev_attr.attr,
+ &sensor_dev_attr_in10_crit.dev_attr.attr,
+ &sensor_dev_attr_in10_fault.dev_attr.attr,
+
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_min.dev_attr.attr,
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ &sensor_dev_attr_temp1_lcrit.dev_attr.attr,
+ &sensor_dev_attr_temp1_crit.dev_attr.attr,
+ &sensor_dev_attr_temp1_fault.dev_attr.attr,
+
+ NULL,
+};
+
+static const struct attribute_group smm665_group = {
+ .attrs = smm665_attributes,
+};
+
+static int smm665_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ struct smm665_data *data;
+ int i, ret;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
+ | I2C_FUNC_SMBUS_WORD_DATA))
+ return -ENODEV;
+
+ if (i2c_smbus_read_byte_data(client, SMM665_ADOC_ENABLE) < 0)
+ return -ENODEV;
+
+ ret = -ENOMEM;
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ goto out_return;
+
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
+
+ data->type = id->driver_data;
+ data->cmdreg = i2c_new_dummy(adapter, (client->addr & ~SMM665_REGMASK)
+ | SMM665_CMDREG_BASE);
+ if (!data->cmdreg)
+ goto out_kfree;
+
+ switch (data->type) {
+ case smm465:
+ case smm665:
+ data->conversion_time = SMM665_ADC_WAIT_SMM665;
+ break;
+ case smm665c:
+ case smm764:
+ case smm766:
+ data->conversion_time = SMM665_ADC_WAIT_SMM766;
+ break;
+ }
+
+ ret = -ENODEV;
+ if (i2c_smbus_read_byte_data(data->cmdreg, SMM665_MISC8_CMD_STS) < 0)
+ goto out_unregister;
+
+ /*
+ * Read limits.
+ *
+ * Limit registers start with register SMM665_LIMIT_BASE.
+ * Each channel uses 8 registers, providing four limit values
+ * per channel. Each limit value requires two registers, with the
+ * high byte in the first register and the low byte in the second
+ * register. The first two limits are under limit values, followed
+ * by two over limit values.
+ *
+ * Limit register order matches the ADC register order, so we use
+ * ADC register defines throughout the code to index limit registers.
+ *
+ * We save the first retrieved value both as "critical" and "alarm"
+ * value. The second value overwrites either the critical or the
+ * alarm value, depending on its configuration. This ensures that both
+ * critical and alarm values are initialized, even if both registers are
+ * configured as critical or non-critical.
+ */
+ for (i = 0; i < SMM665_NUM_ADC; i++) {
+ int val;
+
+ val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8);
+ if (unlikely(val < 0))
+ goto out_unregister;
+ data->critical_min_limit[i] = data->alarm_min_limit[i]
+ = smm665_convert(val, i);
+ val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 2);
+ if (unlikely(val < 0))
+ goto out_unregister;
+ if (smm665_is_critical(val))
+ data->critical_min_limit[i] = smm665_convert(val, i);
+ else
+ data->alarm_min_limit[i] = smm665_convert(val, i);
+ val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 4);
+ if (unlikely(val < 0))
+ goto out_unregister;
+ data->critical_max_limit[i] = data->alarm_max_limit[i]
+ = smm665_convert(val, i);
+ val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 6);
+ if (unlikely(val < 0))
+ goto out_unregister;
+ if (smm665_is_critical(val))
+ data->critical_max_limit[i] = smm665_convert(val, i);
+ else
+ data->alarm_max_limit[i] = smm665_convert(val, i);
+ }
+
+ /* Register sysfs hooks */
+ ret = sysfs_create_group(&client->dev.kobj, &smm665_group);
+ if (ret)
+ goto out_unregister;
+
+ data->hwmon_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ ret = PTR_ERR(data->hwmon_dev);
+ goto out_remove_group;
+ }
+
+ return 0;
+
+out_remove_group:
+ sysfs_remove_group(&client->dev.kobj, &smm665_group);
+out_unregister:
+ i2c_unregister_device(data->cmdreg);
+out_kfree:
+ kfree(data);
+out_return:
+ return ret;
+}
+
+static int smm665_remove(struct i2c_client *client)
+{
+ struct smm665_data *data = i2c_get_clientdata(client);
+
+ i2c_unregister_device(data->cmdreg);
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &smm665_group);
+
+ kfree(data);
+
+ return 0;
+}
+
+static const struct i2c_device_id smm665_id[] = {
+ {"smm465", smm465},
+ {"smm665", smm665},
+ {"smm665c", smm665c},
+ {"smm764", smm764},
+ {"smm766", smm766},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, smm665_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver smm665_driver = {
+ .driver = {
+ .name = "smm665",
+ },
+ .probe = smm665_probe,
+ .remove = smm665_remove,
+ .id_table = smm665_id,
+};
+
+static int __init smm665_init(void)
+{
+ return i2c_add_driver(&smm665_driver);
+}
+
+static void __exit smm665_exit(void)
+{
+ i2c_del_driver(&smm665_driver);
+}
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("SMM665 driver");
+MODULE_LICENSE("GPL");
+
+module_init(smm665_init);
+module_exit(smm665_exit);
--
1.7.0.87.g0901d


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