413 lines
10 KiB
C
413 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Lochnagar hardware monitoring features
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*
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* Copyright (c) 2016-2019 Cirrus Logic, Inc. and
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* Cirrus Logic International Semiconductor Ltd.
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*
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* Author: Lucas Tanure <tanureal@opensource.cirrus.com>
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*/
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#include <linux/delay.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/math64.h>
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#include <linux/mfd/lochnagar.h>
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#include <linux/mfd/lochnagar2_regs.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define LN2_MAX_NSAMPLE 1023
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#define LN2_SAMPLE_US 1670
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#define LN2_CURR_UNITS 1000
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#define LN2_VOLT_UNITS 1000
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#define LN2_TEMP_UNITS 1000
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#define LN2_PWR_UNITS 1000000
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static const char * const lochnagar_chan_names[] = {
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"DBVDD1",
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"1V8 DSP",
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"1V8 CDC",
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"VDDCORE DSP",
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"AVDD 1V8",
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"SYSVDD",
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"VDDCORE CDC",
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"MICVDD",
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};
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struct lochnagar_hwmon {
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struct regmap *regmap;
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long power_nsamples[ARRAY_SIZE(lochnagar_chan_names)];
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/* Lock to ensure only a single sensor is read at a time */
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struct mutex sensor_lock;
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};
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enum lochnagar_measure_mode {
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LN2_CURR = 0,
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LN2_VOLT,
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LN2_TEMP,
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};
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/**
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* float_to_long - Convert ieee754 reading from hardware to an integer
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*
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* @data: Value read from the hardware
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* @precision: Units to multiply up to eg. 1000 = milli, 1000000 = micro
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*
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* Return: Converted integer reading
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*
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* Depending on the measurement type the hardware returns an ieee754
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* floating point value in either volts, amps or celsius. This function
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* will convert that into an integer in a smaller unit such as micro-amps
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* or milli-celsius. The hardware does not return NaN, so consideration of
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* that is not required.
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*/
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static long float_to_long(u32 data, u32 precision)
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{
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u64 man = data & 0x007FFFFF;
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int exp = ((data & 0x7F800000) >> 23) - 127 - 23;
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bool negative = data & 0x80000000;
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long result;
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man = (man + (1 << 23)) * precision;
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if (fls64(man) + exp > (int)sizeof(long) * 8 - 1)
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result = LONG_MAX;
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else if (exp < 0)
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result = (man + (1ull << (-exp - 1))) >> -exp;
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else
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result = man << exp;
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return negative ? -result : result;
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}
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static int do_measurement(struct regmap *regmap, int chan,
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enum lochnagar_measure_mode mode, int nsamples)
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{
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unsigned int val;
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int ret;
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chan = 1 << (chan + LOCHNAGAR2_IMON_MEASURED_CHANNELS_SHIFT);
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ret = regmap_write(regmap, LOCHNAGAR2_IMON_CTRL1,
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LOCHNAGAR2_IMON_ENA_MASK | chan | mode);
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if (ret < 0)
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return ret;
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ret = regmap_write(regmap, LOCHNAGAR2_IMON_CTRL2, nsamples);
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if (ret < 0)
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return ret;
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ret = regmap_write(regmap, LOCHNAGAR2_IMON_CTRL3,
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LOCHNAGAR2_IMON_CONFIGURE_MASK);
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if (ret < 0)
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return ret;
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ret = regmap_read_poll_timeout(regmap, LOCHNAGAR2_IMON_CTRL3, val,
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val & LOCHNAGAR2_IMON_DONE_MASK,
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1000, 10000);
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if (ret < 0)
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return ret;
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ret = regmap_write(regmap, LOCHNAGAR2_IMON_CTRL3,
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LOCHNAGAR2_IMON_MEASURE_MASK);
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if (ret < 0)
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return ret;
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/*
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* Actual measurement time is ~1.67mS per sample, approximate this
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* with a 1.5mS per sample msleep and then poll for success up to
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* ~0.17mS * 1023 (LN2_MAX_NSAMPLES). Normally for smaller values
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* of nsamples the poll will complete on the first loop due to
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* other latency in the system.
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*/
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msleep((nsamples * 3) / 2);
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ret = regmap_read_poll_timeout(regmap, LOCHNAGAR2_IMON_CTRL3, val,
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val & LOCHNAGAR2_IMON_DONE_MASK,
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5000, 200000);
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if (ret < 0)
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return ret;
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return regmap_write(regmap, LOCHNAGAR2_IMON_CTRL3, 0);
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}
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static int request_data(struct regmap *regmap, int chan, u32 *data)
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{
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unsigned int val;
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int ret;
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ret = regmap_write(regmap, LOCHNAGAR2_IMON_CTRL4,
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LOCHNAGAR2_IMON_DATA_REQ_MASK |
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chan << LOCHNAGAR2_IMON_CH_SEL_SHIFT);
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if (ret < 0)
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return ret;
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ret = regmap_read_poll_timeout(regmap, LOCHNAGAR2_IMON_CTRL4, val,
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val & LOCHNAGAR2_IMON_DATA_RDY_MASK,
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1000, 10000);
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if (ret < 0)
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return ret;
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ret = regmap_read(regmap, LOCHNAGAR2_IMON_DATA1, &val);
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if (ret < 0)
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return ret;
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*data = val << 16;
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ret = regmap_read(regmap, LOCHNAGAR2_IMON_DATA2, &val);
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if (ret < 0)
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return ret;
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*data |= val;
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return regmap_write(regmap, LOCHNAGAR2_IMON_CTRL4, 0);
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}
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static int read_sensor(struct device *dev, int chan,
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enum lochnagar_measure_mode mode, int nsamples,
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unsigned int precision, long *val)
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{
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struct lochnagar_hwmon *priv = dev_get_drvdata(dev);
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struct regmap *regmap = priv->regmap;
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u32 data;
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int ret;
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mutex_lock(&priv->sensor_lock);
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ret = do_measurement(regmap, chan, mode, nsamples);
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if (ret < 0) {
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dev_err(dev, "Failed to perform measurement: %d\n", ret);
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goto error;
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}
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ret = request_data(regmap, chan, &data);
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if (ret < 0) {
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dev_err(dev, "Failed to read measurement: %d\n", ret);
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goto error;
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}
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*val = float_to_long(data, precision);
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error:
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mutex_unlock(&priv->sensor_lock);
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return ret;
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}
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static int read_power(struct device *dev, int chan, long *val)
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{
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struct lochnagar_hwmon *priv = dev_get_drvdata(dev);
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int nsamples = priv->power_nsamples[chan];
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u64 power;
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int ret;
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if (!strcmp("SYSVDD", lochnagar_chan_names[chan])) {
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power = 5 * LN2_PWR_UNITS;
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} else {
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ret = read_sensor(dev, chan, LN2_VOLT, 1, LN2_PWR_UNITS, val);
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if (ret < 0)
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return ret;
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power = abs(*val);
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}
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ret = read_sensor(dev, chan, LN2_CURR, nsamples, LN2_PWR_UNITS, val);
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if (ret < 0)
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return ret;
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power *= abs(*val);
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power = DIV_ROUND_CLOSEST_ULL(power, LN2_PWR_UNITS);
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if (power > LONG_MAX)
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*val = LONG_MAX;
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else
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*val = power;
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return 0;
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}
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static umode_t lochnagar_is_visible(const void *drvdata,
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enum hwmon_sensor_types type,
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u32 attr, int chan)
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{
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switch (type) {
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case hwmon_in:
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if (!strcmp("SYSVDD", lochnagar_chan_names[chan]))
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return 0;
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break;
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case hwmon_power:
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if (attr == hwmon_power_average_interval)
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return 0644;
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break;
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default:
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break;
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}
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return 0444;
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}
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static int lochnagar_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int chan, long *val)
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{
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struct lochnagar_hwmon *priv = dev_get_drvdata(dev);
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int interval;
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switch (type) {
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case hwmon_in:
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return read_sensor(dev, chan, LN2_VOLT, 1, LN2_VOLT_UNITS, val);
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case hwmon_curr:
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return read_sensor(dev, chan, LN2_CURR, 1, LN2_CURR_UNITS, val);
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case hwmon_temp:
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return read_sensor(dev, chan, LN2_TEMP, 1, LN2_TEMP_UNITS, val);
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case hwmon_power:
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switch (attr) {
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case hwmon_power_average:
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return read_power(dev, chan, val);
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case hwmon_power_average_interval:
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interval = priv->power_nsamples[chan] * LN2_SAMPLE_US;
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*val = DIV_ROUND_CLOSEST(interval, 1000);
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return 0;
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default:
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return -EOPNOTSUPP;
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}
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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 lochnagar_read_string(struct device *dev,
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enum hwmon_sensor_types type, u32 attr,
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int chan, const char **str)
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{
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switch (type) {
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case hwmon_in:
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case hwmon_curr:
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case hwmon_power:
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*str = lochnagar_chan_names[chan];
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return 0;
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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 lochnagar_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int chan, long val)
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{
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struct lochnagar_hwmon *priv = dev_get_drvdata(dev);
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if (type != hwmon_power || attr != hwmon_power_average_interval)
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return -EOPNOTSUPP;
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val = clamp_t(long, val, 1, (LN2_MAX_NSAMPLE * LN2_SAMPLE_US) / 1000);
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val = DIV_ROUND_CLOSEST(val * 1000, LN2_SAMPLE_US);
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priv->power_nsamples[chan] = val;
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return 0;
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}
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static const struct hwmon_ops lochnagar_ops = {
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.is_visible = lochnagar_is_visible,
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.read = lochnagar_read,
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.read_string = lochnagar_read_string,
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.write = lochnagar_write,
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};
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static const struct hwmon_channel_info *lochnagar_info[] = {
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HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
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HWMON_CHANNEL_INFO(in, HWMON_I_INPUT | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_LABEL),
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HWMON_CHANNEL_INFO(curr, HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL),
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HWMON_CHANNEL_INFO(power, HWMON_P_AVERAGE | HWMON_P_AVERAGE_INTERVAL |
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HWMON_P_LABEL,
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HWMON_P_AVERAGE | HWMON_P_AVERAGE_INTERVAL |
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HWMON_P_LABEL,
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HWMON_P_AVERAGE | HWMON_P_AVERAGE_INTERVAL |
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HWMON_P_LABEL,
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HWMON_P_AVERAGE | HWMON_P_AVERAGE_INTERVAL |
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HWMON_P_LABEL,
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HWMON_P_AVERAGE | HWMON_P_AVERAGE_INTERVAL |
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HWMON_P_LABEL,
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HWMON_P_AVERAGE | HWMON_P_AVERAGE_INTERVAL |
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HWMON_P_LABEL,
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HWMON_P_AVERAGE | HWMON_P_AVERAGE_INTERVAL |
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HWMON_P_LABEL,
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HWMON_P_AVERAGE | HWMON_P_AVERAGE_INTERVAL |
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HWMON_P_LABEL),
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NULL
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};
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static const struct hwmon_chip_info lochnagar_chip_info = {
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.ops = &lochnagar_ops,
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.info = lochnagar_info,
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};
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static const struct of_device_id lochnagar_of_match[] = {
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{ .compatible = "cirrus,lochnagar2-hwmon" },
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{}
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};
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MODULE_DEVICE_TABLE(of, lochnagar_of_match);
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static int lochnagar_hwmon_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device *hwmon_dev;
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struct lochnagar_hwmon *priv;
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int i;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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mutex_init(&priv->sensor_lock);
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priv->regmap = dev_get_regmap(dev->parent, NULL);
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if (!priv->regmap) {
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dev_err(dev, "No register map found\n");
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return -EINVAL;
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}
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for (i = 0; i < ARRAY_SIZE(priv->power_nsamples); i++)
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priv->power_nsamples[i] = 96;
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hwmon_dev = devm_hwmon_device_register_with_info(dev, "Lochnagar", priv,
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&lochnagar_chip_info,
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NULL);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static struct platform_driver lochnagar_hwmon_driver = {
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.driver = {
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.name = "lochnagar-hwmon",
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.of_match_table = lochnagar_of_match,
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},
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.probe = lochnagar_hwmon_probe,
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};
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module_platform_driver(lochnagar_hwmon_driver);
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MODULE_AUTHOR("Lucas Tanure <tanureal@opensource.cirrus.com>");
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MODULE_DESCRIPTION("Lochnagar hardware monitoring features");
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MODULE_LICENSE("GPL");
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