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linux-next/drivers/hwmon/max6697.c
Chu Lin a686024e18 hwmon: (max6697) Allow max6581 to create tempX_offset 
Add tempX_offset attribute support to max6697 driver.
Temperature offsets are only supported for MAX6581.

Testing:
echo 16250 > temp2_offset
cat temp2_offset
16250

echo 17500 > temp3_offset
cat temp3_offset
17500
cat temp4_offset
0
cat temp2_offset
17500

echo 0 > temp2_offset
cat temp2_offset
0
cat temp3_offset
17500

echo -0 > temp2_offset
cat temp2_offset
0

echo -100000 > temp2_offset
cat temp2_input
4875

echo 10000 > temp2_offset
cat temp2_input
47125

echo -2000 > temp2_offset
cat temp2_input
34875

echo -0 > temp2_offset
cat temp2_input
37000

Signed-off-by: Chu Lin <linchuyuan@google.com>
Link: https://lore.kernel.org/r/20200707171528.2929275-1-linchuyuan@google.com
[groeck: Fixed checkpatch warning (unnecessary { })]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-07-24 07:44:57 -07:00

797 lines
23 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
*
* based on max1668.c
* Copyright (c) 2011 David George <david.george@ska.ac.za>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/platform_data/max6697.h>
enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
max6697, max6698, max6699 };
/* Report local sensor as temp1 */
static const u8 MAX6697_REG_TEMP[] = {
0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
static const u8 MAX6697_REG_TEMP_EXT[] = {
0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
static const u8 MAX6697_REG_MAX[] = {
0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
static const u8 MAX6697_REG_CRIT[] = {
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
/*
* Map device tree / platform data register bit map to chip bit map.
* Applies to alert register and over-temperature register.
*/
#define MAX6697_ALERT_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \
(((reg) & 0x01) << 6) | ((reg) & 0x80))
#define MAX6697_OVERT_MAP_BITS(reg) (((reg) >> 1) | (((reg) & 0x01) << 7))
#define MAX6697_REG_STAT(n) (0x44 + (n))
#define MAX6697_REG_CONFIG 0x41
#define MAX6581_CONF_EXTENDED (1 << 1)
#define MAX6693_CONF_BETA (1 << 2)
#define MAX6697_CONF_RESISTANCE (1 << 3)
#define MAX6697_CONF_TIMEOUT (1 << 5)
#define MAX6697_REG_ALERT_MASK 0x42
#define MAX6697_REG_OVERT_MASK 0x43
#define MAX6581_REG_RESISTANCE 0x4a
#define MAX6581_REG_IDEALITY 0x4b
#define MAX6581_REG_IDEALITY_SELECT 0x4c
#define MAX6581_REG_OFFSET 0x4d
#define MAX6581_REG_OFFSET_SELECT 0x4e
#define MAX6581_OFFSET_MIN -31750
#define MAX6581_OFFSET_MAX 31750
#define MAX6697_CONV_TIME 156 /* ms per channel, worst case */
struct max6697_chip_data {
int channels;
u32 have_ext;
u32 have_crit;
u32 have_fault;
u8 valid_conf;
const u8 *alarm_map;
};
struct max6697_data {
struct i2c_client *client;
enum chips type;
const struct max6697_chip_data *chip;
int update_interval; /* in milli-seconds */
int temp_offset; /* in degrees C */
struct mutex update_lock;
unsigned long last_updated; /* In jiffies */
bool valid; /* true if following fields are valid */
/* 1x local and up to 7x remote */
u8 temp[8][4]; /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
#define MAX6697_TEMP_INPUT 0
#define MAX6697_TEMP_EXT 1
#define MAX6697_TEMP_MAX 2
#define MAX6697_TEMP_CRIT 3
u32 alarms;
};
/* Diode fault status bits on MAX6581 are right shifted by one bit */
static const u8 max6581_alarm_map[] = {
0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23 };
static const struct max6697_chip_data max6697_chip_data[] = {
[max6581] = {
.channels = 8,
.have_crit = 0xff,
.have_ext = 0x7f,
.have_fault = 0xfe,
.valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
.alarm_map = max6581_alarm_map,
},
[max6602] = {
.channels = 5,
.have_crit = 0x12,
.have_ext = 0x02,
.have_fault = 0x1e,
.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
},
[max6622] = {
.channels = 5,
.have_crit = 0x12,
.have_ext = 0x02,
.have_fault = 0x1e,
.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
},
[max6636] = {
.channels = 7,
.have_crit = 0x72,
.have_ext = 0x02,
.have_fault = 0x7e,
.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
},
[max6689] = {
.channels = 7,
.have_crit = 0x72,
.have_ext = 0x02,
.have_fault = 0x7e,
.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
},
[max6693] = {
.channels = 7,
.have_crit = 0x72,
.have_ext = 0x02,
.have_fault = 0x7e,
.valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
MAX6697_CONF_TIMEOUT,
},
[max6694] = {
.channels = 5,
.have_crit = 0x12,
.have_ext = 0x02,
.have_fault = 0x1e,
.valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
MAX6697_CONF_TIMEOUT,
},
[max6697] = {
.channels = 7,
.have_crit = 0x72,
.have_ext = 0x02,
.have_fault = 0x7e,
.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
},
[max6698] = {
.channels = 7,
.have_crit = 0x72,
.have_ext = 0x02,
.have_fault = 0x0e,
.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
},
[max6699] = {
.channels = 5,
.have_crit = 0x12,
.have_ext = 0x02,
.have_fault = 0x1e,
.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
},
};
static inline int max6581_offset_to_millic(int val)
{
return sign_extend32(val, 7) * 250;
}
static struct max6697_data *max6697_update_device(struct device *dev)
{
struct max6697_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
struct max6697_data *ret = data;
int val;
int i;
u32 alarms;
mutex_lock(&data->update_lock);
if (data->valid &&
!time_after(jiffies, data->last_updated
+ msecs_to_jiffies(data->update_interval)))
goto abort;
for (i = 0; i < data->chip->channels; i++) {
if (data->chip->have_ext & (1 << i)) {
val = i2c_smbus_read_byte_data(client,
MAX6697_REG_TEMP_EXT[i]);
if (unlikely(val < 0)) {
ret = ERR_PTR(val);
goto abort;
}
data->temp[i][MAX6697_TEMP_EXT] = val;
}
val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
if (unlikely(val < 0)) {
ret = ERR_PTR(val);
goto abort;
}
data->temp[i][MAX6697_TEMP_INPUT] = val;
val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
if (unlikely(val < 0)) {
ret = ERR_PTR(val);
goto abort;
}
data->temp[i][MAX6697_TEMP_MAX] = val;
if (data->chip->have_crit & (1 << i)) {
val = i2c_smbus_read_byte_data(client,
MAX6697_REG_CRIT[i]);
if (unlikely(val < 0)) {
ret = ERR_PTR(val);
goto abort;
}
data->temp[i][MAX6697_TEMP_CRIT] = val;
}
}
alarms = 0;
for (i = 0; i < 3; i++) {
val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
if (unlikely(val < 0)) {
ret = ERR_PTR(val);
goto abort;
}
alarms = (alarms << 8) | val;
}
data->alarms = alarms;
data->last_updated = jiffies;
data->valid = true;
abort:
mutex_unlock(&data->update_lock);
return ret;
}
static ssize_t temp_input_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct max6697_data *data = max6697_update_device(dev);
int temp;
if (IS_ERR(data))
return PTR_ERR(data);
temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
return sprintf(buf, "%d\n", temp * 125);
}
static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
int nr = to_sensor_dev_attr_2(devattr)->nr;
int index = to_sensor_dev_attr_2(devattr)->index;
struct max6697_data *data = max6697_update_device(dev);
int temp;
if (IS_ERR(data))
return PTR_ERR(data);
temp = data->temp[nr][index];
temp -= data->temp_offset;
return sprintf(buf, "%d\n", temp * 1000);
}
static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
int index = to_sensor_dev_attr(attr)->index;
struct max6697_data *data = max6697_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
if (data->chip->alarm_map)
index = data->chip->alarm_map[index];
return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
}
static ssize_t temp_store(struct device *dev,
struct device_attribute *devattr, const char *buf,
size_t count)
{
int nr = to_sensor_dev_attr_2(devattr)->nr;
int index = to_sensor_dev_attr_2(devattr)->index;
struct max6697_data *data = dev_get_drvdata(dev);
long temp;
int ret;
ret = kstrtol(buf, 10, &temp);
if (ret < 0)
return ret;
mutex_lock(&data->update_lock);
temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
data->temp[nr][index] = temp;
ret = i2c_smbus_write_byte_data(data->client,
index == 2 ? MAX6697_REG_MAX[nr]
: MAX6697_REG_CRIT[nr],
temp);
mutex_unlock(&data->update_lock);
return ret < 0 ? ret : count;
}
static ssize_t offset_store(struct device *dev, struct device_attribute *devattr, const char *buf,
size_t count)
{
int val, ret, index, select;
struct max6697_data *data;
bool channel_enabled;
long temp;
index = to_sensor_dev_attr(devattr)->index;
data = dev_get_drvdata(dev);
ret = kstrtol(buf, 10, &temp);
if (ret < 0)
return ret;
mutex_lock(&data->update_lock);
select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
if (select < 0) {
ret = select;
goto abort;
}
channel_enabled = (select & (1 << (index - 1)));
temp = clamp_val(temp, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX);
val = DIV_ROUND_CLOSEST(temp, 250);
/* disable the offset for channel if the new offset is 0 */
if (val == 0) {
if (channel_enabled)
ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
select & ~(1 << (index - 1)));
ret = ret < 0 ? ret : count;
goto abort;
}
if (!channel_enabled) {
ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
select | (1 << (index - 1)));
if (ret < 0)
goto abort;
}
ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET, val);
ret = ret < 0 ? ret : count;
abort:
mutex_unlock(&data->update_lock);
return ret;
}
static ssize_t offset_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct max6697_data *data;
int select, ret, index;
index = to_sensor_dev_attr(devattr)->index;
data = dev_get_drvdata(dev);
mutex_lock(&data->update_lock);
select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
if (select < 0)
ret = select;
else if (select & (1 << (index - 1)))
ret = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET);
else
ret = 0;
mutex_unlock(&data->update_lock);
return ret < 0 ? ret : sprintf(buf, "%d\n", max6581_offset_to_millic(ret));
}
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
/* There is no offset for local temperature so starting from temp2 */
static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 1);
static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 2);
static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 3);
static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 4);
static SENSOR_DEVICE_ATTR_RW(temp6_offset, offset, 5);
static SENSOR_DEVICE_ATTR_RW(temp7_offset, offset, 6);
static SENSOR_DEVICE_ATTR_RW(temp8_offset, offset, 7);
static DEVICE_ATTR(dummy, 0, NULL, NULL);
static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
int index)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct max6697_data *data = dev_get_drvdata(dev);
const struct max6697_chip_data *chip = data->chip;
int channel = index / 7; /* channel number */
int nr = index % 7; /* attribute index within channel */
if (channel >= chip->channels)
return 0;
if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
return 0;
if (nr == 5 && !(chip->have_fault & (1 << channel)))
return 0;
/* offset reg is only supported on max6581 remote channels */
if (nr == 6)
if (data->type != max6581 || channel == 0)
return 0;
return attr->mode;
}
/*
* max6697_is_visible uses the index into the following array to determine
* if attributes should be created or not. Any change in order or content
* must be matched in max6697_is_visible.
*/
static struct attribute *max6697_attributes[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_crit.dev_attr.attr,
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
&dev_attr_dummy.attr,
&dev_attr_dummy.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_crit.dev_attr.attr,
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_temp2_offset.dev_attr.attr,
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_crit.dev_attr.attr,
&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
&sensor_dev_attr_temp3_offset.dev_attr.attr,
&sensor_dev_attr_temp4_input.dev_attr.attr,
&sensor_dev_attr_temp4_max.dev_attr.attr,
&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp4_crit.dev_attr.attr,
&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp4_fault.dev_attr.attr,
&sensor_dev_attr_temp4_offset.dev_attr.attr,
&sensor_dev_attr_temp5_input.dev_attr.attr,
&sensor_dev_attr_temp5_max.dev_attr.attr,
&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp5_crit.dev_attr.attr,
&sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp5_fault.dev_attr.attr,
&sensor_dev_attr_temp5_offset.dev_attr.attr,
&sensor_dev_attr_temp6_input.dev_attr.attr,
&sensor_dev_attr_temp6_max.dev_attr.attr,
&sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp6_crit.dev_attr.attr,
&sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp6_fault.dev_attr.attr,
&sensor_dev_attr_temp6_offset.dev_attr.attr,
&sensor_dev_attr_temp7_input.dev_attr.attr,
&sensor_dev_attr_temp7_max.dev_attr.attr,
&sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp7_crit.dev_attr.attr,
&sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp7_fault.dev_attr.attr,
&sensor_dev_attr_temp7_offset.dev_attr.attr,
&sensor_dev_attr_temp8_input.dev_attr.attr,
&sensor_dev_attr_temp8_max.dev_attr.attr,
&sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp8_crit.dev_attr.attr,
&sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp8_fault.dev_attr.attr,
&sensor_dev_attr_temp8_offset.dev_attr.attr,
NULL
};
static const struct attribute_group max6697_group = {
.attrs = max6697_attributes, .is_visible = max6697_is_visible,
};
__ATTRIBUTE_GROUPS(max6697);
static void max6697_get_config_of(struct device_node *node,
struct max6697_platform_data *pdata)
{
int len;
const __be32 *prop;
pdata->smbus_timeout_disable =
of_property_read_bool(node, "smbus-timeout-disable");
pdata->extended_range_enable =
of_property_read_bool(node, "extended-range-enable");
pdata->beta_compensation =
of_property_read_bool(node, "beta-compensation-enable");
prop = of_get_property(node, "alert-mask", &len);
if (prop && len == sizeof(u32))
pdata->alert_mask = be32_to_cpu(prop[0]);
prop = of_get_property(node, "over-temperature-mask", &len);
if (prop && len == sizeof(u32))
pdata->over_temperature_mask = be32_to_cpu(prop[0]);
prop = of_get_property(node, "resistance-cancellation", &len);
if (prop) {
if (len == sizeof(u32))
pdata->resistance_cancellation = be32_to_cpu(prop[0]);
else
pdata->resistance_cancellation = 0xfe;
}
prop = of_get_property(node, "transistor-ideality", &len);
if (prop && len == 2 * sizeof(u32)) {
pdata->ideality_mask = be32_to_cpu(prop[0]);
pdata->ideality_value = be32_to_cpu(prop[1]);
}
}
static int max6697_init_chip(struct max6697_data *data,
struct i2c_client *client)
{
struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
struct max6697_platform_data p;
const struct max6697_chip_data *chip = data->chip;
int factor = chip->channels;
int ret, reg;
/*
* Don't touch configuration if neither platform data nor OF
* configuration was specified. If that is the case, use the
* current chip configuration.
*/
if (!pdata && !client->dev.of_node) {
reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
if (reg < 0)
return reg;
if (data->type == max6581) {
if (reg & MAX6581_CONF_EXTENDED)
data->temp_offset = 64;
reg = i2c_smbus_read_byte_data(client,
MAX6581_REG_RESISTANCE);
if (reg < 0)
return reg;
factor += hweight8(reg);
} else {
if (reg & MAX6697_CONF_RESISTANCE)
factor++;
}
goto done;
}
if (client->dev.of_node) {
memset(&p, 0, sizeof(p));
max6697_get_config_of(client->dev.of_node, &p);
pdata = &p;
}
reg = 0;
if (pdata->smbus_timeout_disable &&
(chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
reg |= MAX6697_CONF_TIMEOUT;
}
if (pdata->extended_range_enable &&
(chip->valid_conf & MAX6581_CONF_EXTENDED)) {
reg |= MAX6581_CONF_EXTENDED;
data->temp_offset = 64;
}
if (pdata->resistance_cancellation &&
(chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
reg |= MAX6697_CONF_RESISTANCE;
factor++;
}
if (pdata->beta_compensation &&
(chip->valid_conf & MAX6693_CONF_BETA)) {
reg |= MAX6693_CONF_BETA;
}
ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
MAX6697_ALERT_MAP_BITS(pdata->alert_mask));
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
MAX6697_OVERT_MAP_BITS(pdata->over_temperature_mask));
if (ret < 0)
return ret;
if (data->type == max6581) {
factor += hweight8(pdata->resistance_cancellation >> 1);
ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
pdata->resistance_cancellation >> 1);
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
pdata->ideality_value);
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(client,
MAX6581_REG_IDEALITY_SELECT,
pdata->ideality_mask >> 1);
if (ret < 0)
return ret;
}
done:
data->update_interval = factor * MAX6697_CONV_TIME;
return 0;
}
static int max6697_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = client->adapter;
struct device *dev = &client->dev;
struct max6697_data *data;
struct device *hwmon_dev;
int err;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
if (client->dev.of_node)
data->type = (enum chips)of_device_get_match_data(&client->dev);
else
data->type = id->driver_data;
data->chip = &max6697_chip_data[data->type];
data->client = client;
mutex_init(&data->update_lock);
err = max6697_init_chip(data, client);
if (err)
return err;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data,
max6697_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id max6697_id[] = {
{ "max6581", max6581 },
{ "max6602", max6602 },
{ "max6622", max6622 },
{ "max6636", max6636 },
{ "max6689", max6689 },
{ "max6693", max6693 },
{ "max6694", max6694 },
{ "max6697", max6697 },
{ "max6698", max6698 },
{ "max6699", max6699 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max6697_id);
static const struct of_device_id __maybe_unused max6697_of_match[] = {
{
.compatible = "maxim,max6581",
.data = (void *)max6581
},
{
.compatible = "maxim,max6602",
.data = (void *)max6602
},
{
.compatible = "maxim,max6622",
.data = (void *)max6622
},
{
.compatible = "maxim,max6636",
.data = (void *)max6636
},
{
.compatible = "maxim,max6689",
.data = (void *)max6689
},
{
.compatible = "maxim,max6693",
.data = (void *)max6693
},
{
.compatible = "maxim,max6694",
.data = (void *)max6694
},
{
.compatible = "maxim,max6697",
.data = (void *)max6697
},
{
.compatible = "maxim,max6698",
.data = (void *)max6698
},
{
.compatible = "maxim,max6699",
.data = (void *)max6699
},
{ },
};
MODULE_DEVICE_TABLE(of, max6697_of_match);
static struct i2c_driver max6697_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "max6697",
.of_match_table = of_match_ptr(max6697_of_match),
},
.probe = max6697_probe,
.id_table = max6697_id,
};
module_i2c_driver(max6697_driver);
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
MODULE_LICENSE("GPL");
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