linux/drivers/hwmon/stts751.c

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 Based on 3 normalized pattern(s): 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 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 [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-27 06:55:06 +00:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* STTS751 sensor driver
*
* Copyright (C) 2016-2017 Istituto Italiano di Tecnologia - RBCS - EDL
* Robotics, Brain and Cognitive Sciences department
* Electronic Design Laboratory
*
* Written by Andrea Merello <andrea.merello@gmail.com>
*
* Based on LM95241 driver and LM90 driver
*/
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/property.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/util_macros.h>
#define DEVNAME "stts751"
static const unsigned short normal_i2c[] = {
0x48, 0x49, 0x38, 0x39, /* STTS751-0 */
0x4A, 0x4B, 0x3A, 0x3B, /* STTS751-1 */
I2C_CLIENT_END };
#define STTS751_REG_TEMP_H 0x00
#define STTS751_REG_STATUS 0x01
#define STTS751_STATUS_TRIPT BIT(0)
#define STTS751_STATUS_TRIPL BIT(5)
#define STTS751_STATUS_TRIPH BIT(6)
#define STTS751_REG_TEMP_L 0x02
#define STTS751_REG_CONF 0x03
#define STTS751_CONF_RES_MASK 0x0C
#define STTS751_CONF_RES_SHIFT 2
#define STTS751_CONF_EVENT_DIS BIT(7)
#define STTS751_CONF_STOP BIT(6)
#define STTS751_REG_RATE 0x04
#define STTS751_REG_HLIM_H 0x05
#define STTS751_REG_HLIM_L 0x06
#define STTS751_REG_LLIM_H 0x07
#define STTS751_REG_LLIM_L 0x08
#define STTS751_REG_TLIM 0x20
#define STTS751_REG_HYST 0x21
#define STTS751_REG_SMBUS_TO 0x22
#define STTS751_REG_PROD_ID 0xFD
#define STTS751_REG_MAN_ID 0xFE
#define STTS751_REG_REV_ID 0xFF
#define STTS751_0_PROD_ID 0x00
#define STTS751_1_PROD_ID 0x01
#define ST_MAN_ID 0x53
/*
* Possible update intervals are (in mS):
* 16000, 8000, 4000, 2000, 1000, 500, 250, 125, 62.5, 31.25
* However we are not going to complicate things too much and we stick to the
* approx value in mS.
*/
static const int stts751_intervals[] = {
16000, 8000, 4000, 2000, 1000, 500, 250, 125, 63, 31
};
static const struct i2c_device_id stts751_id[] = {
{ "stts751", 0 },
{ }
};
static const struct of_device_id __maybe_unused stts751_of_match[] = {
{ .compatible = "stts751" },
{ },
};
MODULE_DEVICE_TABLE(of, stts751_of_match);
struct stts751_priv {
struct device *dev;
struct i2c_client *client;
struct mutex access_lock;
u8 interval;
int res;
int event_max, event_min;
int therm;
int hyst;
bool smbus_timeout;
int temp;
unsigned long last_update, last_alert_update;
u8 config;
bool min_alert, max_alert, therm_trip;
bool data_valid, alert_valid;
bool notify_max, notify_min;
};
/*
* These functions converts temperature from HW format to integer format and
* vice-vers. They are (mostly) taken from lm90 driver. Unit is in mC.
*/
static int stts751_to_deg(s16 hw_val)
{
return hw_val * 125 / 32;
}
static s32 stts751_to_hw(int val)
{
return DIV_ROUND_CLOSEST(val, 125) * 32;
}
static int stts751_adjust_resolution(struct stts751_priv *priv)
{
u8 res;
switch (priv->interval) {
case 9:
/* 10 bits */
res = 0;
break;
case 8:
/* 11 bits */
res = 1;
break;
default:
/* 12 bits */
res = 3;
break;
}
if (priv->res == res)
return 0;
priv->config &= ~STTS751_CONF_RES_MASK;
priv->config |= res << STTS751_CONF_RES_SHIFT;
dev_dbg(&priv->client->dev, "setting res %d. config %x",
res, priv->config);
priv->res = res;
return i2c_smbus_write_byte_data(priv->client,
STTS751_REG_CONF, priv->config);
}
static int stts751_update_temp(struct stts751_priv *priv)
{
s32 integer1, integer2, frac;
/*
* There is a trick here, like in the lm90 driver. We have to read two
* registers to get the sensor temperature, but we have to beware a
* conversion could occur between the readings. We could use the
* one-shot conversion register, but we don't want to do this (disables
* hardware monitoring). So the solution used here is to read the high
* byte once, then the low byte, then the high byte again. If the new
* high byte matches the old one, then we have a valid reading. Else we
* have to read the low byte again, and now we believe we have a correct
* reading.
*/
integer1 = i2c_smbus_read_byte_data(priv->client, STTS751_REG_TEMP_H);
if (integer1 < 0) {
dev_dbg(&priv->client->dev,
"I2C read failed (temp H). ret: %x\n", integer1);
return integer1;
}
frac = i2c_smbus_read_byte_data(priv->client, STTS751_REG_TEMP_L);
if (frac < 0) {
dev_dbg(&priv->client->dev,
"I2C read failed (temp L). ret: %x\n", frac);
return frac;
}
integer2 = i2c_smbus_read_byte_data(priv->client, STTS751_REG_TEMP_H);
if (integer2 < 0) {
dev_dbg(&priv->client->dev,
"I2C 2nd read failed (temp H). ret: %x\n", integer2);
return integer2;
}
if (integer1 != integer2) {
frac = i2c_smbus_read_byte_data(priv->client,
STTS751_REG_TEMP_L);
if (frac < 0) {
dev_dbg(&priv->client->dev,
"I2C 2nd read failed (temp L). ret: %x\n",
frac);
return frac;
}
}
priv->temp = stts751_to_deg((integer1 << 8) | frac);
return 0;
}
static int stts751_set_temp_reg16(struct stts751_priv *priv, int temp,
u8 hreg, u8 lreg)
{
s32 hwval;
int ret;
hwval = stts751_to_hw(temp);
ret = i2c_smbus_write_byte_data(priv->client, hreg, hwval >> 8);
if (ret)
return ret;
return i2c_smbus_write_byte_data(priv->client, lreg, hwval & 0xff);
}
static int stts751_set_temp_reg8(struct stts751_priv *priv, int temp, u8 reg)
{
s32 hwval;
hwval = stts751_to_hw(temp);
return i2c_smbus_write_byte_data(priv->client, reg, hwval >> 8);
}
static int stts751_read_reg16(struct stts751_priv *priv, int *temp,
u8 hreg, u8 lreg)
{
int integer, frac;
integer = i2c_smbus_read_byte_data(priv->client, hreg);
if (integer < 0)
return integer;
frac = i2c_smbus_read_byte_data(priv->client, lreg);
if (frac < 0)
return frac;
*temp = stts751_to_deg((integer << 8) | frac);
return 0;
}
static int stts751_read_reg8(struct stts751_priv *priv, int *temp, u8 reg)
{
int integer;
integer = i2c_smbus_read_byte_data(priv->client, reg);
if (integer < 0)
return integer;
*temp = stts751_to_deg(integer << 8);
return 0;
}
/*
* Update alert flags without waiting for cache to expire. We detects alerts
* immediately for the sake of the alert handler; we still need to deal with
* caching to workaround the fact that alarm flags int the status register,
* despite what the datasheet claims, gets always cleared on read.
*/
static int stts751_update_alert(struct stts751_priv *priv)
{
int ret;
bool conv_done;
int cache_time = msecs_to_jiffies(stts751_intervals[priv->interval]);
/*
* Add another 10% because if we run faster than the HW conversion
* rate we will end up in reporting incorrectly alarms.
*/
cache_time += cache_time / 10;
ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_STATUS);
if (ret < 0)
return ret;
dev_dbg(&priv->client->dev, "status reg %x\n", ret);
conv_done = ret & (STTS751_STATUS_TRIPH | STTS751_STATUS_TRIPL);
/*
* Reset the cache if the cache time expired, or if we are sure
* we have valid data from a device conversion, or if we know
* our cache has been never written.
*
* Note that when the cache has been never written the point is
* to correctly initialize the timestamp, rather than clearing
* the cache values.
*
* Note that updating the cache timestamp when we get an alarm flag
* is required, otherwise we could incorrectly report alarms to be zero.
*/
if (time_after(jiffies, priv->last_alert_update + cache_time) ||
conv_done || !priv->alert_valid) {
priv->max_alert = false;
priv->min_alert = false;
priv->alert_valid = true;
priv->last_alert_update = jiffies;
dev_dbg(&priv->client->dev, "invalidating alert cache\n");
}
priv->max_alert |= !!(ret & STTS751_STATUS_TRIPH);
priv->min_alert |= !!(ret & STTS751_STATUS_TRIPL);
priv->therm_trip = !!(ret & STTS751_STATUS_TRIPT);
dev_dbg(&priv->client->dev, "max_alert: %d, min_alert: %d, therm_trip: %d\n",
priv->max_alert, priv->min_alert, priv->therm_trip);
return 0;
}
static void stts751_alert(struct i2c_client *client,
enum i2c_alert_protocol type, unsigned int data)
{
int ret;
struct stts751_priv *priv = i2c_get_clientdata(client);
if (type != I2C_PROTOCOL_SMBUS_ALERT)
return;
dev_dbg(&client->dev, "alert!");
mutex_lock(&priv->access_lock);
ret = stts751_update_alert(priv);
if (ret < 0) {
/* default to worst case */
priv->max_alert = true;
priv->min_alert = true;
dev_warn(priv->dev,
"Alert received, but can't communicate to the device. Triggering all alarms!");
}
if (priv->max_alert) {
if (priv->notify_max)
dev_notice(priv->dev, "got alert for HIGH temperature");
priv->notify_max = false;
/* unblock alert poll */
sysfs_notify(&priv->dev->kobj, NULL, "temp1_max_alarm");
}
if (priv->min_alert) {
if (priv->notify_min)
dev_notice(priv->dev, "got alert for LOW temperature");
priv->notify_min = false;
/* unblock alert poll */
sysfs_notify(&priv->dev->kobj, NULL, "temp1_min_alarm");
}
if (priv->min_alert || priv->max_alert)
kobject_uevent(&priv->dev->kobj, KOBJ_CHANGE);
mutex_unlock(&priv->access_lock);
}
static int stts751_update(struct stts751_priv *priv)
{
int ret;
int cache_time = msecs_to_jiffies(stts751_intervals[priv->interval]);
if (time_after(jiffies, priv->last_update + cache_time) ||
!priv->data_valid) {
ret = stts751_update_temp(priv);
if (ret)
return ret;
ret = stts751_update_alert(priv);
if (ret)
return ret;
priv->data_valid = true;
priv->last_update = jiffies;
}
return 0;
}
static ssize_t max_alarm_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int ret;
struct stts751_priv *priv = dev_get_drvdata(dev);
mutex_lock(&priv->access_lock);
ret = stts751_update(priv);
if (!ret)
priv->notify_max = true;
mutex_unlock(&priv->access_lock);
if (ret < 0)
return ret;
return sysfs_emit(buf, "%d\n", priv->max_alert);
}
static ssize_t min_alarm_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int ret;
struct stts751_priv *priv = dev_get_drvdata(dev);
mutex_lock(&priv->access_lock);
ret = stts751_update(priv);
if (!ret)
priv->notify_min = true;
mutex_unlock(&priv->access_lock);
if (ret < 0)
return ret;
return sysfs_emit(buf, "%d\n", priv->min_alert);
}
static ssize_t input_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
int ret;
struct stts751_priv *priv = dev_get_drvdata(dev);
mutex_lock(&priv->access_lock);
ret = stts751_update(priv);
mutex_unlock(&priv->access_lock);
if (ret < 0)
return ret;
return sysfs_emit(buf, "%d\n", priv->temp);
}
static ssize_t therm_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct stts751_priv *priv = dev_get_drvdata(dev);
return sysfs_emit(buf, "%d\n", priv->therm);
}
static ssize_t therm_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
long temp;
struct stts751_priv *priv = dev_get_drvdata(dev);
if (kstrtol(buf, 10, &temp) < 0)
return -EINVAL;
/* HW works in range -64C to +127.937C */
temp = clamp_val(temp, -64000, 127937);
mutex_lock(&priv->access_lock);
ret = stts751_set_temp_reg8(priv, temp, STTS751_REG_TLIM);
if (ret)
goto exit;
dev_dbg(&priv->client->dev, "setting therm %ld", temp);
/*
* hysteresis reg is relative to therm, so the HW does not need to be
* adjusted, we need to update our local copy only.
*/
priv->hyst = temp - (priv->therm - priv->hyst);
priv->therm = temp;
exit:
mutex_unlock(&priv->access_lock);
if (ret)
return ret;
return count;
}
static ssize_t hyst_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct stts751_priv *priv = dev_get_drvdata(dev);
return sysfs_emit(buf, "%d\n", priv->hyst);
}
static ssize_t hyst_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
long temp;
struct stts751_priv *priv = dev_get_drvdata(dev);
if (kstrtol(buf, 10, &temp) < 0)
return -EINVAL;
mutex_lock(&priv->access_lock);
/* HW works in range -64C to +127.937C */
temp = clamp_val(temp, -64000, priv->therm);
priv->hyst = temp;
dev_dbg(&priv->client->dev, "setting hyst %ld", temp);
temp = priv->therm - temp;
ret = stts751_set_temp_reg8(priv, temp, STTS751_REG_HYST);
mutex_unlock(&priv->access_lock);
if (ret)
return ret;
return count;
}
static ssize_t therm_trip_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int ret;
struct stts751_priv *priv = dev_get_drvdata(dev);
mutex_lock(&priv->access_lock);
ret = stts751_update(priv);
mutex_unlock(&priv->access_lock);
if (ret < 0)
return ret;
return sysfs_emit(buf, "%d\n", priv->therm_trip);
}
static ssize_t max_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct stts751_priv *priv = dev_get_drvdata(dev);
return sysfs_emit(buf, "%d\n", priv->event_max);
}
static ssize_t max_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
long temp;
struct stts751_priv *priv = dev_get_drvdata(dev);
if (kstrtol(buf, 10, &temp) < 0)
return -EINVAL;
mutex_lock(&priv->access_lock);
/* HW works in range -64C to +127.937C */
temp = clamp_val(temp, priv->event_min, 127937);
ret = stts751_set_temp_reg16(priv, temp,
STTS751_REG_HLIM_H, STTS751_REG_HLIM_L);
if (ret)
goto exit;
dev_dbg(&priv->client->dev, "setting event max %ld", temp);
priv->event_max = temp;
ret = count;
exit:
mutex_unlock(&priv->access_lock);
return ret;
}
static ssize_t min_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct stts751_priv *priv = dev_get_drvdata(dev);
return sysfs_emit(buf, "%d\n", priv->event_min);
}
static ssize_t min_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
long temp;
struct stts751_priv *priv = dev_get_drvdata(dev);
if (kstrtol(buf, 10, &temp) < 0)
return -EINVAL;
mutex_lock(&priv->access_lock);
/* HW works in range -64C to +127.937C */
temp = clamp_val(temp, -64000, priv->event_max);
ret = stts751_set_temp_reg16(priv, temp,
STTS751_REG_LLIM_H, STTS751_REG_LLIM_L);
if (ret)
goto exit;
dev_dbg(&priv->client->dev, "setting event min %ld", temp);
priv->event_min = temp;
ret = count;
exit:
mutex_unlock(&priv->access_lock);
return ret;
}
static ssize_t interval_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct stts751_priv *priv = dev_get_drvdata(dev);
return sysfs_emit(buf, "%d\n",
stts751_intervals[priv->interval]);
}
static ssize_t interval_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
unsigned long val;
int idx;
int ret = count;
struct stts751_priv *priv = dev_get_drvdata(dev);
if (kstrtoul(buf, 10, &val) < 0)
return -EINVAL;
idx = find_closest_descending(val, stts751_intervals,
ARRAY_SIZE(stts751_intervals));
dev_dbg(&priv->client->dev, "setting interval. req:%lu, idx: %d, val: %d",
val, idx, stts751_intervals[idx]);
mutex_lock(&priv->access_lock);
if (priv->interval == idx)
goto exit;
/*
* In early development stages I've become suspicious about the chip
* starting to misbehave if I ever set, even briefly, an invalid
* configuration. While I'm not sure this is really needed, be
* conservative and set rate/resolution in such an order that avoids
* passing through an invalid configuration.
*/
/* speed up: lower the resolution, then modify convrate */
if (priv->interval < idx) {
dev_dbg(&priv->client->dev, "lower resolution, then modify convrate");
priv->interval = idx;
ret = stts751_adjust_resolution(priv);
if (ret)
goto exit;
}
ret = i2c_smbus_write_byte_data(priv->client, STTS751_REG_RATE, idx);
if (ret)
goto exit;
/* slow down: modify convrate, then raise resolution */
if (priv->interval != idx) {
dev_dbg(&priv->client->dev, "modify convrate, then raise resolution");
priv->interval = idx;
ret = stts751_adjust_resolution(priv);
if (ret)
goto exit;
}
ret = count;
exit:
mutex_unlock(&priv->access_lock);
return ret;
}
static int stts751_detect(struct i2c_client *new_client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = new_client->adapter;
const char *name;
int tmp;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_MAN_ID);
if (tmp != ST_MAN_ID)
return -ENODEV;
/* lower temperaure registers always have bits 0-3 set to zero */
tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_TEMP_L);
if (tmp & 0xf)
return -ENODEV;
tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_HLIM_L);
if (tmp & 0xf)
return -ENODEV;
tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_LLIM_L);
if (tmp & 0xf)
return -ENODEV;
/* smbus timeout register always have bits 0-7 set to zero */
tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_SMBUS_TO);
if (tmp & 0x7f)
return -ENODEV;
tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_PROD_ID);
switch (tmp) {
case STTS751_0_PROD_ID:
name = "STTS751-0";
break;
case STTS751_1_PROD_ID:
name = "STTS751-1";
break;
default:
return -ENODEV;
}
dev_dbg(&new_client->dev, "Chip %s detected", name);
strlcpy(info->type, stts751_id[0].name, I2C_NAME_SIZE);
return 0;
}
static int stts751_read_chip_config(struct stts751_priv *priv)
{
int ret;
int tmp;
ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_CONF);
if (ret < 0)
return ret;
priv->config = ret;
priv->res = (ret & STTS751_CONF_RES_MASK) >> STTS751_CONF_RES_SHIFT;
ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_RATE);
if (ret < 0)
return ret;
if (ret >= ARRAY_SIZE(stts751_intervals)) {
dev_err(priv->dev, "Unrecognized conversion rate 0x%x\n", ret);
return -ENODEV;
}
priv->interval = ret;
ret = stts751_read_reg16(priv, &priv->event_max,
STTS751_REG_HLIM_H, STTS751_REG_HLIM_L);
if (ret)
return ret;
ret = stts751_read_reg16(priv, &priv->event_min,
STTS751_REG_LLIM_H, STTS751_REG_LLIM_L);
if (ret)
return ret;
ret = stts751_read_reg8(priv, &priv->therm, STTS751_REG_TLIM);
if (ret)
return ret;
ret = stts751_read_reg8(priv, &tmp, STTS751_REG_HYST);
if (ret)
return ret;
priv->hyst = priv->therm - tmp;
return 0;
}
static SENSOR_DEVICE_ATTR_RO(temp1_input, input, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_min, min, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_max, max, 0);
static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, min_alarm, 0);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, max_alarm, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_crit, therm, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, hyst, 0);
static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, therm_trip, 0);
static SENSOR_DEVICE_ATTR_RW(update_interval, interval, 0);
static struct attribute *stts751_attrs[] = {
&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_min_alarm.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_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
&sensor_dev_attr_update_interval.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(stts751);
static int stts751_probe(struct i2c_client *client)
{
struct stts751_priv *priv;
int ret;
bool smbus_nto;
int rev_id;
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->client = client;
priv->notify_max = true;
priv->notify_min = true;
i2c_set_clientdata(client, priv);
mutex_init(&priv->access_lock);
if (device_property_present(&client->dev,
"smbus-timeout-disable")) {
smbus_nto = device_property_read_bool(&client->dev,
"smbus-timeout-disable");
ret = i2c_smbus_write_byte_data(client, STTS751_REG_SMBUS_TO,
smbus_nto ? 0 : 0x80);
if (ret)
return ret;
}
rev_id = i2c_smbus_read_byte_data(client, STTS751_REG_REV_ID);
if (rev_id < 0)
return -ENODEV;
if (rev_id != 0x1) {
dev_dbg(&client->dev, "Chip revision 0x%x is untested\n",
rev_id);
}
ret = stts751_read_chip_config(priv);
if (ret)
return ret;
priv->config &= ~(STTS751_CONF_STOP | STTS751_CONF_EVENT_DIS);
ret = i2c_smbus_write_byte_data(client, STTS751_REG_CONF, priv->config);
if (ret)
return ret;
priv->dev = devm_hwmon_device_register_with_groups(&client->dev,
client->name, priv,
stts751_groups);
return PTR_ERR_OR_ZERO(priv->dev);
}
MODULE_DEVICE_TABLE(i2c, stts751_id);
static struct i2c_driver stts751_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = DEVNAME,
.of_match_table = of_match_ptr(stts751_of_match),
},
.probe_new = stts751_probe,
.id_table = stts751_id,
.detect = stts751_detect,
.alert = stts751_alert,
.address_list = normal_i2c,
};
module_i2c_driver(stts751_driver);
MODULE_AUTHOR("Andrea Merello <andrea.merello@gmail.com>");
MODULE_DESCRIPTION("STTS751 sensor driver");
MODULE_LICENSE("GPL");