Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-18 10:01:43 +00:00
Code Issues Packages Projects Releases Wiki Activity
c493fc4bbd
linux/drivers/hwmon/smm665.c
Jean Delvare dcd8f39230 hwmon: Add missing inclusions of <linux/jiffies.h> 
Many hwmon drivers use jiffies but omit the inclusion of the header
file. Fix that, and also fix one driver which was including the header
file but didn't need it.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Luca Tettamanti <kronos.it@gmail.com>
Cc: Marc Hulsman <m.hulsman@tudelft.nl>
Cc: Rudolf Marek <r.marek@assembler.cz>
2012-10-10 15:25:56 +02:00

722 lines
21 KiB
C
Raw Blame History

/*
* 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>
#include <linux/jiffies.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_swapped() instead.
* We could also try to use i2c_master_recv(),
* but that is not always supported.
*/
rv = i2c_smbus_read_word_swapped(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).
*/
radc = (rv >> 11) & 0x0f;
if (radc != adc) {
dev_dbg(&client->dev, "Unexpected RADC: Expected %d got %d",
adc, radc);
return -EIO;
}
return rv & SMM665_ADC_MASK;
}
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_crit_alarm(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);
/* critical alarms */
SMM665_ATTR(in1, crit_alarm, SMM665_FAULT_12V);
SMM665_ATTR(in2, crit_alarm, SMM665_FAULT_VDD);
SMM665_ATTR(in3, crit_alarm, SMM665_FAULT_A);
SMM665_ATTR(in4, crit_alarm, SMM665_FAULT_B);
SMM665_ATTR(in5, crit_alarm, SMM665_FAULT_C);
SMM665_ATTR(in6, crit_alarm, SMM665_FAULT_D);
SMM665_ATTR(in7, crit_alarm, SMM665_FAULT_E);
SMM665_ATTR(in8, crit_alarm, SMM665_FAULT_F);
SMM665_ATTR(in9, crit_alarm, SMM665_FAULT_AIN1);
SMM665_ATTR(in10, crit_alarm, 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, crit_alarm, 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_crit_alarm.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_crit_alarm.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_crit_alarm.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_crit_alarm.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_crit_alarm.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_crit_alarm.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_crit_alarm.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_crit_alarm.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_crit_alarm.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_crit_alarm.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_crit_alarm.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;
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
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)
return -ENOMEM;
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);
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);
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,
};
module_i2c_driver(smm665_driver);
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("SMM665 driver");
MODULE_LICENSE("GPL");
Reference in New Issue View Git Blame Copy Permalink