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412 lines
10 KiB
412 lines
10 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Lochnagar hardware monitoring features"); |
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MODULE_LICENSE("GPL");
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