This patch adds a HWMON driver for ST Microelectronics STTS751
temperature sensors.
It does support manual-triggered conversions as well as automatic
conversions. The latter is used when the "event" or "therm" function
is present (declaring the physical wire is attached in the DT).
Thanks-to: LABBE Corentin [for suggestions]
Signed-off-by: Andrea Merello <andrea.merello@xxxxxxxxx>
Cc: LABBE Corentin <clabbe.montjoie@xxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Jean Delvare <jdelvare@xxxxxxxx>
---
drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/stts751.c | 809 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 820 insertions(+)
create mode 100644 drivers/hwmon/stts751.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index d1f82f2..8fdd241 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1448,6 +1448,16 @@ config SENSORS_SCH5636
This driver can also be built as a module. If so, the module
will be called sch5636.
+config SENSORS_STTS751
+ tristate "ST Microelectronics STTS751"
+ depends on I2C
+ help
+ If you say yes here you get support for STTS751
+ temperature sensor chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called stts751.
+
config SENSORS_SMM665
tristate "Summit Microelectronics SMM665"
depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 7476b22..1114130 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -147,6 +147,7 @@ obj-$(CONFIG_SENSORS_SMM665) += smm665.o
obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o
obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
+obj-$(CONFIG_SENSORS_STTS751) += stts751.o
obj-$(CONFIG_SENSORS_AMC6821) += amc6821.o
obj-$(CONFIG_SENSORS_TC74) += tc74.o
obj-$(CONFIG_SENSORS_THMC50) += thmc50.o
diff --git a/drivers/hwmon/stts751.c b/drivers/hwmon/stts751.c
new file mode 100644
index 0000000..0d4716f
--- /dev/null
+++ b/drivers/hwmon/stts751.c
@@ -0,0 +1,809 @@
+/*
+ * 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@xxxxxxxxx>
+ *
+ * Based on LM95241 driver and LM90 driver
+ *
+ * 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.
+ */
+
+#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 },
+ { }
+};
+
+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;
+};
+
+/*
+ * 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(s32 hw_val)
+{
+ return hw_val * 125 / 32;
+}
+
+static s32 stts751_to_hw(int val)
+{
+ s32 hw_val;
+
+ if (val < 0)
+ hw_val = (val - 62) / 125 * 32;
+ else
+ hw_val = (val + 62) / 125 * 32;
+
+ return hw_val;
+}
+
+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;
+
+ 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;
+ int ret = 0;
+
+ /*
+ * 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", ret);
+ ret = integer1;
+ goto exit;
+ }
+
+ 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", ret);
+ ret = frac;
+ goto exit;
+ }
+
+ 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", ret);
+ ret = integer2;
+ goto exit;
+ }
+
+ 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", ret);
+ ret = frac;
+ goto exit;
+ }
+ }
+
+exit:
+ if (ret)
+ return ret;
+
+ priv->temp = stts751_to_deg((integer1 << 8) | frac);
+ return ret;
+}
+
+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);
+
+ mutex_lock(&priv->access_lock);
+ ret = i2c_smbus_write_byte_data(priv->client, hreg, hwval >> 8);
+ if (!ret)
+ ret = i2c_smbus_write_byte_data(priv->client, lreg,
+ hwval & 0xff);
+ mutex_unlock(&priv->access_lock);
+
+ return ret;
+}
+
+static int stts751_set_temp_reg8(struct stts751_priv *priv, int temp, u8 reg)
+{
+ s32 hwval;
+ int ret;
+
+ hwval = stts751_to_hw(temp);
+
+ mutex_lock(&priv->access_lock);
+ ret = i2c_smbus_write_byte_data(priv->client, reg, hwval >> 8);
+ mutex_unlock(&priv->access_lock);
+
+ return ret;
+}
+
+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 the status register gets cleared when
+ * reading it.
+ */
+static int stts751_update_alert(struct stts751_priv *priv)
+{
+ int ret;
+ bool conv_done;
+ int cache_time =
+ DIV_ROUND_UP(stts751_intervals[priv->interval] * HZ, 1000);
+
+ /*
+ * 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->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->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->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->client->dev,
+ "Alert received, but can't communicate to the device. Something bad happening? Triggering all alarms!");
+ }
+
+ if (priv->max_alert) {
+ dev_notice(&client->dev, "got alert for HIGH temperature");
+
+ /* unblock alert poll */
+ sysfs_notify(&priv->dev->kobj, NULL, "temp1_event_max_alert");
+ kobject_uevent(&priv->dev->kobj, KOBJ_CHANGE);
+ }
+
+ if (priv->min_alert) {
+ dev_notice(&client->dev, "got alert for LOW temperature");
+
+ /* unblock alert poll */
+ sysfs_notify(&priv->dev->kobj, NULL, "temp1_event_min_alert");
+ kobject_uevent(&priv->dev->kobj, KOBJ_CHANGE);
+ }
+ mutex_unlock(&priv->access_lock);
+}
+
+static int stts751_update(struct stts751_priv *priv)
+{
+ int ret = 0;
+ int cache_time = stts751_intervals[priv->interval] / 1000;
+
+ mutex_lock(&priv->access_lock);
+ if (time_after(jiffies, priv->last_update + cache_time) ||
+ !priv->data_valid) {
+ priv->data_valid = true;
+ priv->last_update = jiffies;
+
+ ret = stts751_update_temp(priv);
+ if (ret)
+ goto exit;
+
+ ret = stts751_update_alert(priv);
+ }
+exit:
+ mutex_unlock(&priv->access_lock);
+
+ return ret;
+}
+
+static ssize_t show_max_alarm(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ struct stts751_priv *priv = dev_get_drvdata(dev);
+
+ ret = stts751_update(priv);
+ if (ret < 0)
+ return ret;
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", priv->max_alert);
+}
+
+static ssize_t show_min_alarm(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ struct stts751_priv *priv = dev_get_drvdata(dev);
+
+ ret = stts751_update(priv);
+ if (ret < 0)
+ return ret;
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", priv->min_alert);
+}
+
+static ssize_t show_input(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ struct stts751_priv *priv = dev_get_drvdata(dev);
+
+ ret = stts751_update(priv);
+ if (ret < 0)
+ return ret;
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", priv->temp);
+}
+
+static ssize_t show_therm(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct stts751_priv *priv = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", priv->therm);
+}
+
+static int do_set_hyst(struct stts751_priv *priv, int temp)
+{
+ /* HW works in range -64C to +127.937C */
+ temp = clamp_val(temp, -64000, priv->therm);
+ priv->hyst = temp;
+ dev_dbg(priv->dev, "setting hyst %d", temp);
+ temp = priv->therm - temp;
+
+ return stts751_set_temp_reg8(priv, temp, STTS751_REG_HYST);
+}
+
+static ssize_t set_therm(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);
+ ret = stts751_set_temp_reg8(priv, temp, STTS751_REG_TLIM);
+ if (ret)
+ return ret;
+
+ dev_dbg(dev, "setting therm %ld", temp);
+ priv->therm = temp;
+
+ /*
+ * hysteresis reg is relative to therm, so we need to update
+ * it as well.
+ */
+ ret = do_set_hyst(priv, priv->hyst);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static ssize_t show_hyst(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct stts751_priv *priv = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", priv->hyst);
+}
+
+static ssize_t set_hyst(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;
+ ret = do_set_hyst(priv, temp);
+ if (ret)
+ return ret;
+ return count;
+}
+
+static ssize_t show_therm_trip(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int ret;
+ struct stts751_priv *priv = dev_get_drvdata(dev);
+
+ ret = stts751_update(priv);
+ if (ret < 0)
+ return ret;
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", priv->therm_trip);
+}
+
+static ssize_t show_max(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct stts751_priv *priv = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", priv->event_max);
+}
+
+static ssize_t set_max(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, priv->event_min, 127937);
+ ret = stts751_set_temp_reg16(priv, temp,
+ STTS751_REG_HLIM_H, STTS751_REG_HLIM_L);
+ if (ret)
+ return ret;
+
+ dev_dbg(dev, "setting event max %ld", temp);
+ priv->event_max = temp;
+ return count;
+}
+
+static ssize_t show_min(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct stts751_priv *priv = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", priv->event_min);
+}
+
+static ssize_t set_min(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, priv->event_max);
+ ret = stts751_set_temp_reg16(priv, temp,
+ STTS751_REG_LLIM_H, STTS751_REG_LLIM_L);
+ if (ret)
+ return ret;
+
+ dev_dbg(dev, "setting event min %ld", temp);
+
+ priv->event_min = temp;
+ return count;
+}
+
+static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct stts751_priv *priv = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n",
+ stts751_intervals[priv->interval]);
+}
+
+static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long val;
+ int idx;
+ int ret = 0;
+ 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(dev, "setting interval. req:%lu, idx: %d, val: %d", val, idx,
+ stts751_intervals[idx]);
+
+ if (priv->interval == idx)
+ return count;
+
+ mutex_lock(&priv->access_lock);
+
+ /*
+ * 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) {
+ 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) {
+ priv->interval = idx;
+ ret = stts751_adjust_resolution(priv);
+ if (ret)
+ goto exit;
+ }
+exit:
+ mutex_unlock(&priv->access_lock);
+
+ return count;
+}
+
+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 mfg_id, prod_id, rev_id;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ mfg_id = i2c_smbus_read_byte_data(new_client, ST_MAN_ID);
+ if (mfg_id != ST_MAN_ID)
+ return -ENODEV;
+
+ prod_id = i2c_smbus_read_byte_data(new_client, STTS751_REG_PROD_ID);
+
+ switch (prod_id) {
+ 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);
+
+ rev_id = i2c_smbus_read_byte_data(new_client, STTS751_REG_REV_ID);
+ if (rev_id < 0)
+ return -ENODEV;
+ if (rev_id != 0x1) {
+ dev_notice(&new_client->dev,
+ "Chip revision 0x%x is untested\nPlease report whether it works to andrea.merello@xxxxxxxxx",
+ rev_id);
+ }
+
+ 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;
+ 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 ret;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_min, set_min, 0);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_max, set_max, 0);
+static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_min_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_max_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_therm,
+ set_therm, 0);
+static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_hyst,
+ set_hyst, 0);
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_therm_trip, NULL, 0);
+static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
+ show_interval, set_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,
+ const struct i2c_device_id *id)
+{
+ struct stts751_priv *priv;
+ int ret;
+ bool smbus_to;
+
+ priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->client = client;
+ i2c_set_clientdata(client, priv);
+ mutex_init(&priv->access_lock);
+
+ if (device_property_present(&client->dev,
+ "smbus-timeout-disable")) {
+ smbus_to = !device_property_read_bool(&client->dev,
+ "smbus-timeout-disable");
+
+ ret = i2c_smbus_write_byte_data(priv->client,
+ STTS751_REG_SMBUS_TO,
+ smbus_to ? 0x80 : 0);
+ if (ret)
+ return ret;
+ }
+
+ 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(priv->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,
+ },
+ .probe = 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@xxxxxxxxx>");
+MODULE_DESCRIPTION("STTS751 sensor driver");
+MODULE_LICENSE("GPL");
--
2.7.4
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