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linux-next/drivers/hwmon/max16065.c
Axel Lin a7b30ea500 hwmon: (max16065) Use PTR_ERR_OR_ZERO 
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2014-08-04 07:01:38 -07:00

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/*
* Driver for
* Maxim MAX16065/MAX16066 12-Channel/8-Channel, Flash-Configurable
* System Managers with Nonvolatile Fault Registers
* Maxim MAX16067/MAX16068 6-Channel, Flash-Configurable System Managers
* with Nonvolatile Fault Registers
* Maxim MAX16070/MAX16071 12-Channel/8-Channel, Flash-Configurable System
* Monitors with Nonvolatile Fault Registers
*
* Copyright (C) 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; version 2 of the License.
*/
#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/jiffies.h>
enum chips { max16065, max16066, max16067, max16068, max16070, max16071 };
/*
* Registers
*/
#define MAX16065_ADC(x) ((x) * 2)
#define MAX16065_CURR_SENSE 0x18
#define MAX16065_CSP_ADC 0x19
#define MAX16065_FAULT(x) (0x1b + (x))
#define MAX16065_SCALE(x) (0x43 + (x))
#define MAX16065_CURR_CONTROL 0x47
#define MAX16065_LIMIT(l, x) (0x48 + (l) + (x) * 3) /*
* l: limit
* 0: min/max
* 1: crit
* 2: lcrit
* x: ADC index
*/
#define MAX16065_SW_ENABLE 0x73
#define MAX16065_WARNING_OV (1 << 3) /* Set if secondary threshold is OV
warning */
#define MAX16065_CURR_ENABLE (1 << 0)
#define MAX16065_NUM_LIMIT 3
#define MAX16065_NUM_ADC 12 /* maximum number of ADC channels */
static const int max16065_num_adc[] = {
[max16065] = 12,
[max16066] = 8,
[max16067] = 6,
[max16068] = 6,
[max16070] = 12,
[max16071] = 8,
};
static const bool max16065_have_secondary[] = {
[max16065] = true,
[max16066] = true,
[max16067] = false,
[max16068] = false,
[max16070] = true,
[max16071] = true,
};
static const bool max16065_have_current[] = {
[max16065] = true,
[max16066] = true,
[max16067] = false,
[max16068] = false,
[max16070] = true,
[max16071] = true,
};
struct max16065_data {
enum chips type;
struct i2c_client *client;
const struct attribute_group *groups[4];
struct mutex update_lock;
bool valid;
unsigned long last_updated; /* in jiffies */
int num_adc;
bool have_current;
int curr_gain;
/* limits are in mV */
int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC];
int range[MAX16065_NUM_ADC + 1];/* voltage range */
int adc[MAX16065_NUM_ADC + 1]; /* adc values (raw) including csp_adc */
int curr_sense;
int fault[2];
};
static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
static const int max16065_csp_adc_range[] = { 7000, 14000 };
/* ADC registers have 10 bit resolution. */
static inline int ADC_TO_MV(int adc, int range)
{
return (adc * range) / 1024;
}
/*
* Limit registers have 8 bit resolution and match upper 8 bits of ADC
* registers.
*/
static inline int LIMIT_TO_MV(int limit, int range)
{
return limit * range / 256;
}
static inline int MV_TO_LIMIT(int mv, int range)
{
return clamp_val(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255);
}
static inline int ADC_TO_CURR(int adc, int gain)
{
return adc * 1400000 / (gain * 255);
}
/*
* max16065_read_adc()
*
* Read 16 bit value from <reg>, <reg+1>.
* Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>.
*/
static int max16065_read_adc(struct i2c_client *client, int reg)
{
int rv;
rv = i2c_smbus_read_word_swapped(client, reg);
if (unlikely(rv < 0))
return rv;
return rv >> 6;
}
static struct max16065_data *max16065_update_device(struct device *dev)
{
struct max16065_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
int i;
for (i = 0; i < data->num_adc; i++)
data->adc[i]
= max16065_read_adc(client, MAX16065_ADC(i));
if (data->have_current) {
data->adc[MAX16065_NUM_ADC]
= max16065_read_adc(client, MAX16065_CSP_ADC);
data->curr_sense
= i2c_smbus_read_byte_data(client,
MAX16065_CURR_SENSE);
}
for (i = 0; i < DIV_ROUND_UP(data->num_adc, 8); i++)
data->fault[i]
= i2c_smbus_read_byte_data(client, MAX16065_FAULT(i));
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
static ssize_t max16065_show_alarm(struct device *dev,
struct device_attribute *da, char *buf)
{
struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
struct max16065_data *data = max16065_update_device(dev);
int val = data->fault[attr2->nr];
if (val < 0)
return val;
val &= (1 << attr2->index);
if (val)
i2c_smbus_write_byte_data(data->client,
MAX16065_FAULT(attr2->nr), val);
return snprintf(buf, PAGE_SIZE, "%d\n", !!val);
}
static ssize_t max16065_show_input(struct device *dev,
struct device_attribute *da, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct max16065_data *data = max16065_update_device(dev);
int adc = data->adc[attr->index];
if (unlikely(adc < 0))
return adc;
return snprintf(buf, PAGE_SIZE, "%d\n",
ADC_TO_MV(adc, data->range[attr->index]));
}
static ssize_t max16065_show_current(struct device *dev,
struct device_attribute *da, char *buf)
{
struct max16065_data *data = max16065_update_device(dev);
if (unlikely(data->curr_sense < 0))
return data->curr_sense;
return snprintf(buf, PAGE_SIZE, "%d\n",
ADC_TO_CURR(data->curr_sense, data->curr_gain));
}
static ssize_t max16065_set_limit(struct device *dev,
struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
struct max16065_data *data = dev_get_drvdata(dev);
unsigned long val;
int err;
int limit;
err = kstrtoul(buf, 10, &val);
if (unlikely(err < 0))
return err;
limit = MV_TO_LIMIT(val, data->range[attr2->index]);
mutex_lock(&data->update_lock);
data->limit[attr2->nr][attr2->index]
= LIMIT_TO_MV(limit, data->range[attr2->index]);
i2c_smbus_write_byte_data(data->client,
MAX16065_LIMIT(attr2->nr, attr2->index),
limit);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t max16065_show_limit(struct device *dev,
struct device_attribute *da, char *buf)
{
struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
struct max16065_data *data = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%d\n",
data->limit[attr2->nr][attr2->index]);
}
/* Construct a sensor_device_attribute structure for each register */
/* Input voltages */
static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, max16065_show_input, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, max16065_show_input, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, max16065_show_input, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, max16065_show_input, NULL, 3);
static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, max16065_show_input, NULL, 4);
static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, max16065_show_input, NULL, 5);
static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, max16065_show_input, NULL, 6);
static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, max16065_show_input, NULL, 7);
static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, max16065_show_input, NULL, 8);
static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, max16065_show_input, NULL, 9);
static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, max16065_show_input, NULL, 10);
static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, max16065_show_input, NULL, 11);
static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, max16065_show_input, NULL, 12);
/* Input voltages lcrit */
static SENSOR_DEVICE_ATTR_2(in0_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 0);
static SENSOR_DEVICE_ATTR_2(in1_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 1);
static SENSOR_DEVICE_ATTR_2(in2_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 2);
static SENSOR_DEVICE_ATTR_2(in3_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 3);
static SENSOR_DEVICE_ATTR_2(in4_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 4);
static SENSOR_DEVICE_ATTR_2(in5_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 5);
static SENSOR_DEVICE_ATTR_2(in6_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 6);
static SENSOR_DEVICE_ATTR_2(in7_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 7);
static SENSOR_DEVICE_ATTR_2(in8_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 8);
static SENSOR_DEVICE_ATTR_2(in9_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 9);
static SENSOR_DEVICE_ATTR_2(in10_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 10);
static SENSOR_DEVICE_ATTR_2(in11_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 2, 11);
/* Input voltages crit */
static SENSOR_DEVICE_ATTR_2(in0_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 0);
static SENSOR_DEVICE_ATTR_2(in1_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 1);
static SENSOR_DEVICE_ATTR_2(in2_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 2);
static SENSOR_DEVICE_ATTR_2(in3_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 3);
static SENSOR_DEVICE_ATTR_2(in4_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 4);
static SENSOR_DEVICE_ATTR_2(in5_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 5);
static SENSOR_DEVICE_ATTR_2(in6_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 6);
static SENSOR_DEVICE_ATTR_2(in7_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 7);
static SENSOR_DEVICE_ATTR_2(in8_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 8);
static SENSOR_DEVICE_ATTR_2(in9_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 9);
static SENSOR_DEVICE_ATTR_2(in10_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 10);
static SENSOR_DEVICE_ATTR_2(in11_crit, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 1, 11);
/* Input voltages min */
static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 0);
static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 1);
static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 2);
static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 3);
static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 4);
static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 5);
static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 6);
static SENSOR_DEVICE_ATTR_2(in7_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 7);
static SENSOR_DEVICE_ATTR_2(in8_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 8);
static SENSOR_DEVICE_ATTR_2(in9_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 9);
static SENSOR_DEVICE_ATTR_2(in10_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 10);
static SENSOR_DEVICE_ATTR_2(in11_min, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 11);
/* Input voltages max */
static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 0);
static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 1);
static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 2);
static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 3);
static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 4);
static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 5);
static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 6);
static SENSOR_DEVICE_ATTR_2(in7_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 7);
static SENSOR_DEVICE_ATTR_2(in8_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 8);
static SENSOR_DEVICE_ATTR_2(in9_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 9);
static SENSOR_DEVICE_ATTR_2(in10_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 10);
static SENSOR_DEVICE_ATTR_2(in11_max, S_IWUSR | S_IRUGO, max16065_show_limit,
max16065_set_limit, 0, 11);
/* alarms */
static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, max16065_show_alarm, NULL,
0, 0);
static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, max16065_show_alarm, NULL,
0, 1);
static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, max16065_show_alarm, NULL,
0, 2);
static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, max16065_show_alarm, NULL,
0, 3);
static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, max16065_show_alarm, NULL,
0, 4);
static SENSOR_DEVICE_ATTR_2(in5_alarm, S_IRUGO, max16065_show_alarm, NULL,
0, 5);
static SENSOR_DEVICE_ATTR_2(in6_alarm, S_IRUGO, max16065_show_alarm, NULL,
0, 6);
static SENSOR_DEVICE_ATTR_2(in7_alarm, S_IRUGO, max16065_show_alarm, NULL,
0, 7);
static SENSOR_DEVICE_ATTR_2(in8_alarm, S_IRUGO, max16065_show_alarm, NULL,
1, 0);
static SENSOR_DEVICE_ATTR_2(in9_alarm, S_IRUGO, max16065_show_alarm, NULL,
1, 1);
static SENSOR_DEVICE_ATTR_2(in10_alarm, S_IRUGO, max16065_show_alarm, NULL,
1, 2);
static SENSOR_DEVICE_ATTR_2(in11_alarm, S_IRUGO, max16065_show_alarm, NULL,
1, 3);
/* Current and alarm */
static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, max16065_show_current, NULL, 0);
static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, max16065_show_alarm, NULL,
1, 4);
/*
* Finally, construct an array of pointers to members of the above objects,
* as required for sysfs_create_group()
*/
static struct attribute *max16065_basic_attributes[] = {
&sensor_dev_attr_in0_input.dev_attr.attr,
&sensor_dev_attr_in0_lcrit.dev_attr.attr,
&sensor_dev_attr_in0_crit.dev_attr.attr,
&sensor_dev_attr_in0_alarm.dev_attr.attr,
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in1_lcrit.dev_attr.attr,
&sensor_dev_attr_in1_crit.dev_attr.attr,
&sensor_dev_attr_in1_alarm.dev_attr.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in2_lcrit.dev_attr.attr,
&sensor_dev_attr_in2_crit.dev_attr.attr,
&sensor_dev_attr_in2_alarm.dev_attr.attr,
&sensor_dev_attr_in3_input.dev_attr.attr,
&sensor_dev_attr_in3_lcrit.dev_attr.attr,
&sensor_dev_attr_in3_crit.dev_attr.attr,
&sensor_dev_attr_in3_alarm.dev_attr.attr,
&sensor_dev_attr_in4_input.dev_attr.attr,
&sensor_dev_attr_in4_lcrit.dev_attr.attr,
&sensor_dev_attr_in4_crit.dev_attr.attr,
&sensor_dev_attr_in4_alarm.dev_attr.attr,
&sensor_dev_attr_in5_input.dev_attr.attr,
&sensor_dev_attr_in5_lcrit.dev_attr.attr,
&sensor_dev_attr_in5_crit.dev_attr.attr,
&sensor_dev_attr_in5_alarm.dev_attr.attr,
&sensor_dev_attr_in6_input.dev_attr.attr,
&sensor_dev_attr_in6_lcrit.dev_attr.attr,
&sensor_dev_attr_in6_crit.dev_attr.attr,
&sensor_dev_attr_in6_alarm.dev_attr.attr,
&sensor_dev_attr_in7_input.dev_attr.attr,
&sensor_dev_attr_in7_lcrit.dev_attr.attr,
&sensor_dev_attr_in7_crit.dev_attr.attr,
&sensor_dev_attr_in7_alarm.dev_attr.attr,
&sensor_dev_attr_in8_input.dev_attr.attr,
&sensor_dev_attr_in8_lcrit.dev_attr.attr,
&sensor_dev_attr_in8_crit.dev_attr.attr,
&sensor_dev_attr_in8_alarm.dev_attr.attr,
&sensor_dev_attr_in9_input.dev_attr.attr,
&sensor_dev_attr_in9_lcrit.dev_attr.attr,
&sensor_dev_attr_in9_crit.dev_attr.attr,
&sensor_dev_attr_in9_alarm.dev_attr.attr,
&sensor_dev_attr_in10_input.dev_attr.attr,
&sensor_dev_attr_in10_lcrit.dev_attr.attr,
&sensor_dev_attr_in10_crit.dev_attr.attr,
&sensor_dev_attr_in10_alarm.dev_attr.attr,
&sensor_dev_attr_in11_input.dev_attr.attr,
&sensor_dev_attr_in11_lcrit.dev_attr.attr,
&sensor_dev_attr_in11_crit.dev_attr.attr,
&sensor_dev_attr_in11_alarm.dev_attr.attr,
NULL
};
static struct attribute *max16065_current_attributes[] = {
&sensor_dev_attr_in12_input.dev_attr.attr,
&sensor_dev_attr_curr1_input.dev_attr.attr,
&sensor_dev_attr_curr1_alarm.dev_attr.attr,
NULL
};
static struct attribute *max16065_min_attributes[] = {
&sensor_dev_attr_in0_min.dev_attr.attr,
&sensor_dev_attr_in1_min.dev_attr.attr,
&sensor_dev_attr_in2_min.dev_attr.attr,
&sensor_dev_attr_in3_min.dev_attr.attr,
&sensor_dev_attr_in4_min.dev_attr.attr,
&sensor_dev_attr_in5_min.dev_attr.attr,
&sensor_dev_attr_in6_min.dev_attr.attr,
&sensor_dev_attr_in7_min.dev_attr.attr,
&sensor_dev_attr_in8_min.dev_attr.attr,
&sensor_dev_attr_in9_min.dev_attr.attr,
&sensor_dev_attr_in10_min.dev_attr.attr,
&sensor_dev_attr_in11_min.dev_attr.attr,
NULL
};
static struct attribute *max16065_max_attributes[] = {
&sensor_dev_attr_in0_max.dev_attr.attr,
&sensor_dev_attr_in1_max.dev_attr.attr,
&sensor_dev_attr_in2_max.dev_attr.attr,
&sensor_dev_attr_in3_max.dev_attr.attr,
&sensor_dev_attr_in4_max.dev_attr.attr,
&sensor_dev_attr_in5_max.dev_attr.attr,
&sensor_dev_attr_in6_max.dev_attr.attr,
&sensor_dev_attr_in7_max.dev_attr.attr,
&sensor_dev_attr_in8_max.dev_attr.attr,
&sensor_dev_attr_in9_max.dev_attr.attr,
&sensor_dev_attr_in10_max.dev_attr.attr,
&sensor_dev_attr_in11_max.dev_attr.attr,
NULL
};
static umode_t max16065_basic_is_visible(struct kobject *kobj,
struct attribute *a, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct max16065_data *data = dev_get_drvdata(dev);
int index = n / 4;
if (index >= data->num_adc || !data->range[index])
return 0;
return a->mode;
}
static umode_t max16065_secondary_is_visible(struct kobject *kobj,
struct attribute *a, int index)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct max16065_data *data = dev_get_drvdata(dev);
if (index >= data->num_adc)
return 0;
return a->mode;
}
static const struct attribute_group max16065_basic_group = {
.attrs = max16065_basic_attributes,
.is_visible = max16065_basic_is_visible,
};
static const struct attribute_group max16065_current_group = {
.attrs = max16065_current_attributes,
};
static const struct attribute_group max16065_min_group = {
.attrs = max16065_min_attributes,
.is_visible = max16065_secondary_is_visible,
};
static const struct attribute_group max16065_max_group = {
.attrs = max16065_max_attributes,
.is_visible = max16065_secondary_is_visible,
};
static int max16065_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = client->adapter;
struct max16065_data *data;
struct device *dev = &client->dev;
struct device *hwmon_dev;
int i, j, val;
bool have_secondary; /* true if chip has secondary limits */
bool secondary_is_max = false; /* secondary limits reflect max */
int groups = 0;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_READ_WORD_DATA))
return -ENODEV;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (unlikely(!data))
return -ENOMEM;
data->client = client;
mutex_init(&data->update_lock);
data->num_adc = max16065_num_adc[id->driver_data];
data->have_current = max16065_have_current[id->driver_data];
have_secondary = max16065_have_secondary[id->driver_data];
if (have_secondary) {
val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE);
if (unlikely(val < 0))
return val;
secondary_is_max = val & MAX16065_WARNING_OV;
}
/* Read scale registers, convert to range */
for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) {
val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i));
if (unlikely(val < 0))
return val;
for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) {
data->range[i * 4 + j] =
max16065_adc_range[(val >> (j * 2)) & 0x3];
}
}
/* Read limits */
for (i = 0; i < MAX16065_NUM_LIMIT; i++) {
if (i == 0 && !have_secondary)
continue;
for (j = 0; j < data->num_adc; j++) {
val = i2c_smbus_read_byte_data(client,
MAX16065_LIMIT(i, j));
if (unlikely(val < 0))
return val;
data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]);
}
}
/* sysfs hooks */
data->groups[groups++] = &max16065_basic_group;
if (have_secondary)
data->groups[groups++] = secondary_is_max ?
&max16065_max_group : &max16065_min_group;
if (data->have_current) {
val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL);
if (unlikely(val < 0))
return val;
if (val & MAX16065_CURR_ENABLE) {
/*
* Current gain is 6, 12, 24, 48 based on values in
* bit 2,3.
*/
data->curr_gain = 6 << ((val >> 2) & 0x03);
data->range[MAX16065_NUM_ADC]
= max16065_csp_adc_range[(val >> 1) & 0x01];
data->groups[groups++] = &max16065_current_group;
} else {
data->have_current = false;
}
}
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data, data->groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id max16065_id[] = {
{ "max16065", max16065 },
{ "max16066", max16066 },
{ "max16067", max16067 },
{ "max16068", max16068 },
{ "max16070", max16070 },
{ "max16071", max16071 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max16065_id);
/* This is the driver that will be inserted */
static struct i2c_driver max16065_driver = {
.driver = {
.name = "max16065",
},
.probe = max16065_probe,
.id_table = max16065_id,
};
module_i2c_driver(max16065_driver);
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
MODULE_DESCRIPTION("MAX16065 driver");
MODULE_LICENSE("GPL");
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