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https://github.com/torvalds/linux
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d7bb04c3e2
Statically allocated array of pointed to hwmon_channel_info can be made const for safety. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
419 lines
10 KiB
C
419 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* This driver handles the ADT7410 and compatible digital temperature sensors.
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* Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
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* based on lm75.c by Frodo Looijaard <frodol@dds.nl>
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* and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/hwmon.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/regmap.h>
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#include "adt7x10.h"
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/*
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* ADT7X10 status
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*/
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#define ADT7X10_STAT_T_LOW (1 << 4)
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#define ADT7X10_STAT_T_HIGH (1 << 5)
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#define ADT7X10_STAT_T_CRIT (1 << 6)
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#define ADT7X10_STAT_NOT_RDY (1 << 7)
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/*
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* ADT7X10 config
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*/
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#define ADT7X10_FAULT_QUEUE_MASK (1 << 0 | 1 << 1)
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#define ADT7X10_CT_POLARITY (1 << 2)
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#define ADT7X10_INT_POLARITY (1 << 3)
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#define ADT7X10_EVENT_MODE (1 << 4)
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#define ADT7X10_MODE_MASK (1 << 5 | 1 << 6)
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#define ADT7X10_FULL (0 << 5 | 0 << 6)
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#define ADT7X10_PD (1 << 5 | 1 << 6)
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#define ADT7X10_RESOLUTION (1 << 7)
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/*
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* ADT7X10 masks
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*/
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#define ADT7X10_T13_VALUE_MASK 0xFFF8
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#define ADT7X10_T_HYST_MASK 0xF
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/* straight from the datasheet */
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#define ADT7X10_TEMP_MIN (-55000)
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#define ADT7X10_TEMP_MAX 150000
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/* Each client has this additional data */
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struct adt7x10_data {
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struct regmap *regmap;
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struct mutex update_lock;
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u8 config;
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u8 oldconfig;
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bool valid; /* true if temperature valid */
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};
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enum {
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adt7x10_temperature = 0,
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adt7x10_t_alarm_high,
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adt7x10_t_alarm_low,
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adt7x10_t_crit,
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};
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static const u8 ADT7X10_REG_TEMP[] = {
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[adt7x10_temperature] = ADT7X10_TEMPERATURE, /* input */
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[adt7x10_t_alarm_high] = ADT7X10_T_ALARM_HIGH, /* high */
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[adt7x10_t_alarm_low] = ADT7X10_T_ALARM_LOW, /* low */
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[adt7x10_t_crit] = ADT7X10_T_CRIT, /* critical */
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};
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static irqreturn_t adt7x10_irq_handler(int irq, void *private)
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{
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struct device *dev = private;
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struct adt7x10_data *d = dev_get_drvdata(dev);
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unsigned int status;
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int ret;
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ret = regmap_read(d->regmap, ADT7X10_STATUS, &status);
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if (ret < 0)
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return IRQ_HANDLED;
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if (status & ADT7X10_STAT_T_HIGH)
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hwmon_notify_event(dev, hwmon_temp, hwmon_temp_max_alarm, 0);
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if (status & ADT7X10_STAT_T_LOW)
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hwmon_notify_event(dev, hwmon_temp, hwmon_temp_min_alarm, 0);
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if (status & ADT7X10_STAT_T_CRIT)
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hwmon_notify_event(dev, hwmon_temp, hwmon_temp_crit_alarm, 0);
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return IRQ_HANDLED;
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}
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static int adt7x10_temp_ready(struct regmap *regmap)
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{
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unsigned int status;
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int i, ret;
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for (i = 0; i < 6; i++) {
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ret = regmap_read(regmap, ADT7X10_STATUS, &status);
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if (ret < 0)
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return ret;
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if (!(status & ADT7X10_STAT_NOT_RDY))
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return 0;
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msleep(60);
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}
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return -ETIMEDOUT;
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}
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static s16 ADT7X10_TEMP_TO_REG(long temp)
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{
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return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN,
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ADT7X10_TEMP_MAX) * 128, 1000);
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}
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static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg)
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{
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/* in 13 bit mode, bits 0-2 are status flags - mask them out */
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if (!(data->config & ADT7X10_RESOLUTION))
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reg &= ADT7X10_T13_VALUE_MASK;
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/*
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* temperature is stored in twos complement format, in steps of
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* 1/128°C
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*/
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return DIV_ROUND_CLOSEST(reg * 1000, 128);
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}
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/*-----------------------------------------------------------------------*/
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static int adt7x10_temp_read(struct adt7x10_data *data, int index, long *val)
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{
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unsigned int regval;
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int ret;
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mutex_lock(&data->update_lock);
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if (index == adt7x10_temperature && !data->valid) {
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/* wait for valid temperature */
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ret = adt7x10_temp_ready(data->regmap);
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if (ret) {
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mutex_unlock(&data->update_lock);
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return ret;
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}
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data->valid = true;
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}
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mutex_unlock(&data->update_lock);
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ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], ®val);
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if (ret)
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return ret;
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*val = ADT7X10_REG_TO_TEMP(data, regval);
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return 0;
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}
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static int adt7x10_temp_write(struct adt7x10_data *data, int index, long temp)
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{
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int ret;
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mutex_lock(&data->update_lock);
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ret = regmap_write(data->regmap, ADT7X10_REG_TEMP[index],
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ADT7X10_TEMP_TO_REG(temp));
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static int adt7x10_hyst_read(struct adt7x10_data *data, int index, long *val)
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{
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int hyst, temp, ret;
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mutex_lock(&data->update_lock);
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ret = regmap_read(data->regmap, ADT7X10_T_HYST, &hyst);
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if (ret) {
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mutex_unlock(&data->update_lock);
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return ret;
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}
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ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], &temp);
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mutex_unlock(&data->update_lock);
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if (ret)
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return ret;
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hyst = (hyst & ADT7X10_T_HYST_MASK) * 1000;
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/*
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* hysteresis is stored as a 4 bit offset in the device, convert it
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* to an absolute value
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*/
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/* min has positive offset, others have negative */
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if (index == adt7x10_t_alarm_low)
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hyst = -hyst;
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*val = ADT7X10_REG_TO_TEMP(data, temp) - hyst;
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return 0;
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}
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static int adt7x10_hyst_write(struct adt7x10_data *data, long hyst)
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{
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unsigned int regval;
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int limit, ret;
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mutex_lock(&data->update_lock);
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/* convert absolute hysteresis value to a 4 bit delta value */
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ret = regmap_read(data->regmap, ADT7X10_T_ALARM_HIGH, ®val);
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if (ret < 0)
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goto abort;
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limit = ADT7X10_REG_TO_TEMP(data, regval);
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hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
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regval = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0,
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ADT7X10_T_HYST_MASK);
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ret = regmap_write(data->regmap, ADT7X10_T_HYST, regval);
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abort:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static int adt7x10_alarm_read(struct adt7x10_data *data, int index, long *val)
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{
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unsigned int status;
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int ret;
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ret = regmap_read(data->regmap, ADT7X10_STATUS, &status);
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if (ret < 0)
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return ret;
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*val = !!(status & index);
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return 0;
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}
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static umode_t adt7x10_is_visible(const void *data,
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enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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switch (attr) {
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case hwmon_temp_max:
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case hwmon_temp_min:
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case hwmon_temp_crit:
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case hwmon_temp_max_hyst:
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return 0644;
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case hwmon_temp_input:
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case hwmon_temp_min_alarm:
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case hwmon_temp_max_alarm:
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case hwmon_temp_crit_alarm:
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case hwmon_temp_min_hyst:
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case hwmon_temp_crit_hyst:
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return 0444;
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default:
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break;
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}
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return 0;
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}
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static int adt7x10_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct adt7x10_data *data = dev_get_drvdata(dev);
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switch (attr) {
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case hwmon_temp_input:
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return adt7x10_temp_read(data, adt7x10_temperature, val);
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case hwmon_temp_max:
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return adt7x10_temp_read(data, adt7x10_t_alarm_high, val);
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case hwmon_temp_min:
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return adt7x10_temp_read(data, adt7x10_t_alarm_low, val);
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case hwmon_temp_crit:
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return adt7x10_temp_read(data, adt7x10_t_crit, val);
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case hwmon_temp_max_hyst:
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return adt7x10_hyst_read(data, adt7x10_t_alarm_high, val);
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case hwmon_temp_min_hyst:
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return adt7x10_hyst_read(data, adt7x10_t_alarm_low, val);
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case hwmon_temp_crit_hyst:
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return adt7x10_hyst_read(data, adt7x10_t_crit, val);
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case hwmon_temp_min_alarm:
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return adt7x10_alarm_read(data, ADT7X10_STAT_T_LOW, val);
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case hwmon_temp_max_alarm:
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return adt7x10_alarm_read(data, ADT7X10_STAT_T_HIGH, val);
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case hwmon_temp_crit_alarm:
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return adt7x10_alarm_read(data, ADT7X10_STAT_T_CRIT, val);
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default:
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return -EOPNOTSUPP;
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}
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}
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static int adt7x10_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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struct adt7x10_data *data = dev_get_drvdata(dev);
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switch (attr) {
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case hwmon_temp_max:
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return adt7x10_temp_write(data, adt7x10_t_alarm_high, val);
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case hwmon_temp_min:
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return adt7x10_temp_write(data, adt7x10_t_alarm_low, val);
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case hwmon_temp_crit:
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return adt7x10_temp_write(data, adt7x10_t_crit, val);
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case hwmon_temp_max_hyst:
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return adt7x10_hyst_write(data, val);
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default:
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return -EOPNOTSUPP;
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}
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}
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static const struct hwmon_channel_info * const adt7x10_info[] = {
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HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
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HWMON_T_CRIT | HWMON_T_MAX_HYST | HWMON_T_MIN_HYST |
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HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
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HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM),
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NULL,
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};
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static const struct hwmon_ops adt7x10_hwmon_ops = {
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.is_visible = adt7x10_is_visible,
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.read = adt7x10_read,
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.write = adt7x10_write,
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};
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static const struct hwmon_chip_info adt7x10_chip_info = {
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.ops = &adt7x10_hwmon_ops,
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.info = adt7x10_info,
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};
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static void adt7x10_restore_config(void *private)
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{
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struct adt7x10_data *data = private;
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regmap_write(data->regmap, ADT7X10_CONFIG, data->oldconfig);
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}
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int adt7x10_probe(struct device *dev, const char *name, int irq,
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struct regmap *regmap)
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{
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struct adt7x10_data *data;
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unsigned int config;
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struct device *hdev;
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int ret;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->regmap = regmap;
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dev_set_drvdata(dev, data);
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mutex_init(&data->update_lock);
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/* configure as specified */
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ret = regmap_read(regmap, ADT7X10_CONFIG, &config);
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if (ret < 0) {
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dev_dbg(dev, "Can't read config? %d\n", ret);
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return ret;
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}
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data->oldconfig = config;
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/*
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* Set to 16 bit resolution, continous conversion and comparator mode.
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*/
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data->config = data->oldconfig;
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data->config &= ~(ADT7X10_MODE_MASK | ADT7X10_CT_POLARITY |
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ADT7X10_INT_POLARITY);
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data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE;
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if (data->config != data->oldconfig) {
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ret = regmap_write(regmap, ADT7X10_CONFIG, data->config);
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if (ret)
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return ret;
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ret = devm_add_action_or_reset(dev, adt7x10_restore_config, data);
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if (ret)
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return ret;
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}
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dev_dbg(dev, "Config %02x\n", data->config);
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hdev = devm_hwmon_device_register_with_info(dev, name, data,
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&adt7x10_chip_info, NULL);
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if (IS_ERR(hdev))
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return PTR_ERR(hdev);
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if (irq > 0) {
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ret = devm_request_threaded_irq(dev, irq, NULL,
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adt7x10_irq_handler,
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IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT,
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dev_name(dev), hdev);
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if (ret)
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(adt7x10_probe);
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static int adt7x10_suspend(struct device *dev)
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{
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struct adt7x10_data *data = dev_get_drvdata(dev);
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return regmap_write(data->regmap, ADT7X10_CONFIG,
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data->config | ADT7X10_PD);
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}
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static int adt7x10_resume(struct device *dev)
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{
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struct adt7x10_data *data = dev_get_drvdata(dev);
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return regmap_write(data->regmap, ADT7X10_CONFIG, data->config);
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}
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EXPORT_SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
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MODULE_AUTHOR("Hartmut Knaack");
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MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
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MODULE_LICENSE("GPL");
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