![Guenter Roeck](/assets/img/avatar_default.png)
The following build warning is seen if CONFIG_OF is disabled. drivers/hwmon/stts751.c:88:34: warning: ‘stts751_of_match’ defined but not used Mark stts751_of_match as __maybe_unused to fix the problem. Signed-off-by: Guenter Roeck <linux@roeck-us.net>
846 lines
21 KiB
C
846 lines
21 KiB
C
/*
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* STTS751 sensor driver
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*
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* Copyright (C) 2016-2017 Istituto Italiano di Tecnologia - RBCS - EDL
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* Robotics, Brain and Cognitive Sciences department
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* Electronic Design Laboratory
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*
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* Written by Andrea Merello <andrea.merello@gmail.com>
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*
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* Based on LM95241 driver and LM90 driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/util_macros.h>
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#define DEVNAME "stts751"
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static const unsigned short normal_i2c[] = {
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0x48, 0x49, 0x38, 0x39, /* STTS751-0 */
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0x4A, 0x4B, 0x3A, 0x3B, /* STTS751-1 */
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I2C_CLIENT_END };
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#define STTS751_REG_TEMP_H 0x00
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#define STTS751_REG_STATUS 0x01
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#define STTS751_STATUS_TRIPT BIT(0)
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#define STTS751_STATUS_TRIPL BIT(5)
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#define STTS751_STATUS_TRIPH BIT(6)
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#define STTS751_REG_TEMP_L 0x02
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#define STTS751_REG_CONF 0x03
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#define STTS751_CONF_RES_MASK 0x0C
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#define STTS751_CONF_RES_SHIFT 2
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#define STTS751_CONF_EVENT_DIS BIT(7)
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#define STTS751_CONF_STOP BIT(6)
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#define STTS751_REG_RATE 0x04
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#define STTS751_REG_HLIM_H 0x05
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#define STTS751_REG_HLIM_L 0x06
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#define STTS751_REG_LLIM_H 0x07
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#define STTS751_REG_LLIM_L 0x08
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#define STTS751_REG_TLIM 0x20
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#define STTS751_REG_HYST 0x21
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#define STTS751_REG_SMBUS_TO 0x22
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#define STTS751_REG_PROD_ID 0xFD
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#define STTS751_REG_MAN_ID 0xFE
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#define STTS751_REG_REV_ID 0xFF
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#define STTS751_0_PROD_ID 0x00
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#define STTS751_1_PROD_ID 0x01
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#define ST_MAN_ID 0x53
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/*
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* Possible update intervals are (in mS):
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* 16000, 8000, 4000, 2000, 1000, 500, 250, 125, 62.5, 31.25
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* However we are not going to complicate things too much and we stick to the
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* approx value in mS.
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*/
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static const int stts751_intervals[] = {
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16000, 8000, 4000, 2000, 1000, 500, 250, 125, 63, 31
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};
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static const struct i2c_device_id stts751_id[] = {
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{ "stts751", 0 },
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{ }
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};
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static const struct of_device_id __maybe_unused stts751_of_match[] = {
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{ .compatible = "stts751" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, stts751_of_match);
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struct stts751_priv {
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struct device *dev;
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struct i2c_client *client;
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struct mutex access_lock;
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u8 interval;
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int res;
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int event_max, event_min;
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int therm;
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int hyst;
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bool smbus_timeout;
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int temp;
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unsigned long last_update, last_alert_update;
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u8 config;
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bool min_alert, max_alert, therm_trip;
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bool data_valid, alert_valid;
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bool notify_max, notify_min;
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};
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/*
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* These functions converts temperature from HW format to integer format and
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* vice-vers. They are (mostly) taken from lm90 driver. Unit is in mC.
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*/
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static int stts751_to_deg(s16 hw_val)
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{
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return hw_val * 125 / 32;
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}
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static s32 stts751_to_hw(int val)
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{
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return DIV_ROUND_CLOSEST(val, 125) * 32;
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}
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static int stts751_adjust_resolution(struct stts751_priv *priv)
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{
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u8 res;
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switch (priv->interval) {
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case 9:
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/* 10 bits */
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res = 0;
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break;
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case 8:
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/* 11 bits */
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res = 1;
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break;
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default:
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/* 12 bits */
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res = 3;
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break;
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}
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if (priv->res == res)
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return 0;
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priv->config &= ~STTS751_CONF_RES_MASK;
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priv->config |= res << STTS751_CONF_RES_SHIFT;
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dev_dbg(&priv->client->dev, "setting res %d. config %x",
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res, priv->config);
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priv->res = res;
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return i2c_smbus_write_byte_data(priv->client,
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STTS751_REG_CONF, priv->config);
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}
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static int stts751_update_temp(struct stts751_priv *priv)
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{
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s32 integer1, integer2, frac;
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/*
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* There is a trick here, like in the lm90 driver. We have to read two
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* registers to get the sensor temperature, but we have to beware a
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* conversion could occur between the readings. We could use the
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* one-shot conversion register, but we don't want to do this (disables
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* hardware monitoring). So the solution used here is to read the high
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* byte once, then the low byte, then the high byte again. If the new
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* high byte matches the old one, then we have a valid reading. Else we
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* have to read the low byte again, and now we believe we have a correct
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* reading.
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*/
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integer1 = i2c_smbus_read_byte_data(priv->client, STTS751_REG_TEMP_H);
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if (integer1 < 0) {
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dev_dbg(&priv->client->dev,
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"I2C read failed (temp H). ret: %x\n", integer1);
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return integer1;
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}
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frac = i2c_smbus_read_byte_data(priv->client, STTS751_REG_TEMP_L);
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if (frac < 0) {
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dev_dbg(&priv->client->dev,
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"I2C read failed (temp L). ret: %x\n", frac);
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return frac;
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}
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integer2 = i2c_smbus_read_byte_data(priv->client, STTS751_REG_TEMP_H);
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if (integer2 < 0) {
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dev_dbg(&priv->client->dev,
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"I2C 2nd read failed (temp H). ret: %x\n", integer2);
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return integer2;
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}
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if (integer1 != integer2) {
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frac = i2c_smbus_read_byte_data(priv->client,
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STTS751_REG_TEMP_L);
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if (frac < 0) {
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dev_dbg(&priv->client->dev,
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"I2C 2nd read failed (temp L). ret: %x\n",
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frac);
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return frac;
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}
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}
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priv->temp = stts751_to_deg((integer1 << 8) | frac);
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return 0;
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}
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static int stts751_set_temp_reg16(struct stts751_priv *priv, int temp,
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u8 hreg, u8 lreg)
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{
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s32 hwval;
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int ret;
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hwval = stts751_to_hw(temp);
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ret = i2c_smbus_write_byte_data(priv->client, hreg, hwval >> 8);
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if (ret)
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return ret;
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return i2c_smbus_write_byte_data(priv->client, lreg, hwval & 0xff);
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}
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static int stts751_set_temp_reg8(struct stts751_priv *priv, int temp, u8 reg)
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{
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s32 hwval;
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hwval = stts751_to_hw(temp);
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return i2c_smbus_write_byte_data(priv->client, reg, hwval >> 8);
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}
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static int stts751_read_reg16(struct stts751_priv *priv, int *temp,
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u8 hreg, u8 lreg)
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{
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int integer, frac;
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integer = i2c_smbus_read_byte_data(priv->client, hreg);
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if (integer < 0)
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return integer;
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frac = i2c_smbus_read_byte_data(priv->client, lreg);
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if (frac < 0)
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return frac;
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*temp = stts751_to_deg((integer << 8) | frac);
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return 0;
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}
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static int stts751_read_reg8(struct stts751_priv *priv, int *temp, u8 reg)
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{
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int integer;
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integer = i2c_smbus_read_byte_data(priv->client, reg);
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if (integer < 0)
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return integer;
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*temp = stts751_to_deg(integer << 8);
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return 0;
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}
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/*
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* Update alert flags without waiting for cache to expire. We detects alerts
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* immediately for the sake of the alert handler; we still need to deal with
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* caching to workaround the fact that alarm flags int the status register,
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* despite what the datasheet claims, gets always cleared on read.
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*/
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static int stts751_update_alert(struct stts751_priv *priv)
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{
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int ret;
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bool conv_done;
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int cache_time = msecs_to_jiffies(stts751_intervals[priv->interval]);
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/*
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* Add another 10% because if we run faster than the HW conversion
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* rate we will end up in reporting incorrectly alarms.
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*/
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cache_time += cache_time / 10;
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ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_STATUS);
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if (ret < 0)
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return ret;
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dev_dbg(&priv->client->dev, "status reg %x\n", ret);
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conv_done = ret & (STTS751_STATUS_TRIPH | STTS751_STATUS_TRIPL);
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/*
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* Reset the cache if the cache time expired, or if we are sure
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* we have valid data from a device conversion, or if we know
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* our cache has been never written.
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*
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* Note that when the cache has been never written the point is
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* to correctly initialize the timestamp, rather than clearing
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* the cache values.
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*
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* Note that updating the cache timestamp when we get an alarm flag
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* is required, otherwise we could incorrectly report alarms to be zero.
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*/
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if (time_after(jiffies, priv->last_alert_update + cache_time) ||
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conv_done || !priv->alert_valid) {
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priv->max_alert = false;
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priv->min_alert = false;
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priv->alert_valid = true;
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priv->last_alert_update = jiffies;
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dev_dbg(&priv->client->dev, "invalidating alert cache\n");
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}
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priv->max_alert |= !!(ret & STTS751_STATUS_TRIPH);
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priv->min_alert |= !!(ret & STTS751_STATUS_TRIPL);
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priv->therm_trip = !!(ret & STTS751_STATUS_TRIPT);
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dev_dbg(&priv->client->dev, "max_alert: %d, min_alert: %d, therm_trip: %d\n",
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priv->max_alert, priv->min_alert, priv->therm_trip);
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return 0;
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}
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static void stts751_alert(struct i2c_client *client,
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enum i2c_alert_protocol type, unsigned int data)
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{
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int ret;
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struct stts751_priv *priv = i2c_get_clientdata(client);
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if (type != I2C_PROTOCOL_SMBUS_ALERT)
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return;
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dev_dbg(&client->dev, "alert!");
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mutex_lock(&priv->access_lock);
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ret = stts751_update_alert(priv);
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if (ret < 0) {
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/* default to worst case */
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priv->max_alert = true;
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priv->min_alert = true;
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dev_warn(priv->dev,
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"Alert received, but can't communicate to the device. Triggering all alarms!");
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}
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if (priv->max_alert) {
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if (priv->notify_max)
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dev_notice(priv->dev, "got alert for HIGH temperature");
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priv->notify_max = false;
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/* unblock alert poll */
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sysfs_notify(&priv->dev->kobj, NULL, "temp1_max_alarm");
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}
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if (priv->min_alert) {
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if (priv->notify_min)
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dev_notice(priv->dev, "got alert for LOW temperature");
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priv->notify_min = false;
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/* unblock alert poll */
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sysfs_notify(&priv->dev->kobj, NULL, "temp1_min_alarm");
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}
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if (priv->min_alert || priv->max_alert)
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kobject_uevent(&priv->dev->kobj, KOBJ_CHANGE);
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mutex_unlock(&priv->access_lock);
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}
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static int stts751_update(struct stts751_priv *priv)
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{
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int ret;
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int cache_time = msecs_to_jiffies(stts751_intervals[priv->interval]);
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if (time_after(jiffies, priv->last_update + cache_time) ||
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!priv->data_valid) {
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ret = stts751_update_temp(priv);
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if (ret)
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return ret;
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ret = stts751_update_alert(priv);
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if (ret)
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return ret;
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priv->data_valid = true;
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priv->last_update = jiffies;
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}
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return 0;
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}
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static ssize_t max_alarm_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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struct stts751_priv *priv = dev_get_drvdata(dev);
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mutex_lock(&priv->access_lock);
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ret = stts751_update(priv);
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if (!ret)
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priv->notify_max = true;
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mutex_unlock(&priv->access_lock);
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if (ret < 0)
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return ret;
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return snprintf(buf, PAGE_SIZE, "%d\n", priv->max_alert);
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}
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static ssize_t min_alarm_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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struct stts751_priv *priv = dev_get_drvdata(dev);
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mutex_lock(&priv->access_lock);
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ret = stts751_update(priv);
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if (!ret)
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priv->notify_min = true;
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mutex_unlock(&priv->access_lock);
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if (ret < 0)
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return ret;
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return snprintf(buf, PAGE_SIZE, "%d\n", priv->min_alert);
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}
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static ssize_t input_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int ret;
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struct stts751_priv *priv = dev_get_drvdata(dev);
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mutex_lock(&priv->access_lock);
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ret = stts751_update(priv);
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mutex_unlock(&priv->access_lock);
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if (ret < 0)
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return ret;
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return snprintf(buf, PAGE_SIZE, "%d\n", priv->temp);
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}
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static ssize_t therm_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct stts751_priv *priv = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n", priv->therm);
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}
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static ssize_t therm_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int ret;
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long temp;
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struct stts751_priv *priv = dev_get_drvdata(dev);
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if (kstrtol(buf, 10, &temp) < 0)
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return -EINVAL;
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/* HW works in range -64C to +127.937C */
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temp = clamp_val(temp, -64000, 127937);
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mutex_lock(&priv->access_lock);
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ret = stts751_set_temp_reg8(priv, temp, STTS751_REG_TLIM);
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if (ret)
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goto exit;
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dev_dbg(&priv->client->dev, "setting therm %ld", temp);
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/*
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* hysteresis reg is relative to therm, so the HW does not need to be
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* adjusted, we need to update our local copy only.
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*/
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priv->hyst = temp - (priv->therm - priv->hyst);
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priv->therm = temp;
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exit:
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mutex_unlock(&priv->access_lock);
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if (ret)
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return ret;
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return count;
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}
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static ssize_t hyst_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct stts751_priv *priv = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n", priv->hyst);
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}
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static ssize_t hyst_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int ret;
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long temp;
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struct stts751_priv *priv = dev_get_drvdata(dev);
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if (kstrtol(buf, 10, &temp) < 0)
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return -EINVAL;
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mutex_lock(&priv->access_lock);
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/* HW works in range -64C to +127.937C */
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temp = clamp_val(temp, -64000, priv->therm);
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priv->hyst = temp;
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dev_dbg(&priv->client->dev, "setting hyst %ld", temp);
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temp = priv->therm - temp;
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ret = stts751_set_temp_reg8(priv, temp, STTS751_REG_HYST);
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mutex_unlock(&priv->access_lock);
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if (ret)
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return ret;
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return count;
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}
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|
|
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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
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 = 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");
|