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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * HWMON Driver for Dialog DA90554 *5 * Copyright(c) 2012 Dialog Semiconductor Ltd.6 *7 * Author: David Dajun Chen <dchen@diasemi.com>8 */9 10#include <linux/delay.h>11#include <linux/err.h>12#include <linux/hwmon.h>13#include <linux/hwmon-sysfs.h>14#include <linux/init.h>15#include <linux/kernel.h>16#include <linux/module.h>17#include <linux/platform_device.h>18#include <linux/completion.h>19 20#include <linux/mfd/da9055/core.h>21#include <linux/mfd/da9055/reg.h>22 23#define DA9055_ADCIN_DIV 10224#define DA9055_VSYS_DIV 8525 26#define DA9055_ADC_VSYS 027#define DA9055_ADC_ADCIN1 128#define DA9055_ADC_ADCIN2 229#define DA9055_ADC_ADCIN3 330#define DA9055_ADC_TJUNC 431 32struct da9055_hwmon {33 struct da9055 *da9055;34 struct mutex hwmon_lock;35 struct mutex irq_lock;36 struct completion done;37};38 39static const char * const input_names[] = {40 [DA9055_ADC_VSYS] = "VSYS",41 [DA9055_ADC_ADCIN1] = "ADC IN1",42 [DA9055_ADC_ADCIN2] = "ADC IN2",43 [DA9055_ADC_ADCIN3] = "ADC IN3",44 [DA9055_ADC_TJUNC] = "CHIP TEMP",45};46 47static const u8 chan_mux[DA9055_ADC_TJUNC + 1] = {48 [DA9055_ADC_VSYS] = DA9055_ADC_MUX_VSYS,49 [DA9055_ADC_ADCIN1] = DA9055_ADC_MUX_ADCIN1,50 [DA9055_ADC_ADCIN2] = DA9055_ADC_MUX_ADCIN2,51 [DA9055_ADC_ADCIN3] = DA9055_ADC_MUX_ADCIN3,52 [DA9055_ADC_TJUNC] = DA9055_ADC_MUX_T_SENSE,53};54 55static int da9055_adc_manual_read(struct da9055_hwmon *hwmon,56 unsigned char channel)57{58 int ret;59 unsigned short calc_data;60 unsigned short data;61 unsigned char mux_sel;62 struct da9055 *da9055 = hwmon->da9055;63 64 if (channel > DA9055_ADC_TJUNC)65 return -EINVAL;66 67 mutex_lock(&hwmon->irq_lock);68 69 /* Selects desired MUX for manual conversion */70 mux_sel = chan_mux[channel] | DA9055_ADC_MAN_CONV;71 72 ret = da9055_reg_write(da9055, DA9055_REG_ADC_MAN, mux_sel);73 if (ret < 0)74 goto err;75 76 /* Wait for an interrupt */77 if (!wait_for_completion_timeout(&hwmon->done,78 msecs_to_jiffies(500))) {79 dev_err(da9055->dev,80 "timeout waiting for ADC conversion interrupt\n");81 ret = -ETIMEDOUT;82 goto err;83 }84 85 ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_H);86 if (ret < 0)87 goto err;88 89 calc_data = (unsigned short)ret;90 data = calc_data << 2;91 92 ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_L);93 if (ret < 0)94 goto err;95 96 calc_data = (unsigned short)(ret & DA9055_ADC_LSB_MASK);97 data |= calc_data;98 99 ret = data;100 101err:102 mutex_unlock(&hwmon->irq_lock);103 return ret;104}105 106static irqreturn_t da9055_auxadc_irq(int irq, void *irq_data)107{108 struct da9055_hwmon *hwmon = irq_data;109 110 complete(&hwmon->done);111 112 return IRQ_HANDLED;113}114 115/* Conversion function for VSYS and ADCINx */116static inline int volt_reg_to_mv(int value, int channel)117{118 if (channel == DA9055_ADC_VSYS)119 return DIV_ROUND_CLOSEST(value * 1000, DA9055_VSYS_DIV) + 2500;120 else121 return DIV_ROUND_CLOSEST(value * 1000, DA9055_ADCIN_DIV);122}123 124static int da9055_enable_auto_mode(struct da9055 *da9055, int channel)125{126 127 return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel,128 1 << channel);129 130}131 132static int da9055_disable_auto_mode(struct da9055 *da9055, int channel)133{134 135 return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 0);136}137 138static ssize_t da9055_auto_ch_show(struct device *dev,139 struct device_attribute *devattr,140 char *buf)141{142 struct da9055_hwmon *hwmon = dev_get_drvdata(dev);143 int ret, adc;144 int channel = to_sensor_dev_attr(devattr)->index;145 146 mutex_lock(&hwmon->hwmon_lock);147 148 ret = da9055_enable_auto_mode(hwmon->da9055, channel);149 if (ret < 0)150 goto hwmon_err;151 152 usleep_range(10000, 10500);153 154 adc = da9055_reg_read(hwmon->da9055, DA9055_REG_VSYS_RES + channel);155 if (adc < 0) {156 ret = adc;157 goto hwmon_err_release;158 }159 160 ret = da9055_disable_auto_mode(hwmon->da9055, channel);161 if (ret < 0)162 goto hwmon_err;163 164 mutex_unlock(&hwmon->hwmon_lock);165 166 return sprintf(buf, "%d\n", volt_reg_to_mv(adc, channel));167 168hwmon_err_release:169 da9055_disable_auto_mode(hwmon->da9055, channel);170hwmon_err:171 mutex_unlock(&hwmon->hwmon_lock);172 return ret;173}174 175static ssize_t da9055_tjunc_show(struct device *dev,176 struct device_attribute *devattr, char *buf)177{178 struct da9055_hwmon *hwmon = dev_get_drvdata(dev);179 int tjunc;180 int toffset;181 182 tjunc = da9055_adc_manual_read(hwmon, DA9055_ADC_TJUNC);183 if (tjunc < 0)184 return tjunc;185 186 toffset = da9055_reg_read(hwmon->da9055, DA9055_REG_T_OFFSET);187 if (toffset < 0)188 return toffset;189 190 /*191 * Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332192 * T_OFFSET is a trim value used to improve accuracy of the result193 */194 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset)195 + 3076332, 10000));196}197 198static ssize_t label_show(struct device *dev,199 struct device_attribute *devattr, char *buf)200{201 return sprintf(buf, "%s\n",202 input_names[to_sensor_dev_attr(devattr)->index]);203}204 205static SENSOR_DEVICE_ATTR_RO(in0_input, da9055_auto_ch, DA9055_ADC_VSYS);206static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9055_ADC_VSYS);207static SENSOR_DEVICE_ATTR_RO(in1_input, da9055_auto_ch, DA9055_ADC_ADCIN1);208static SENSOR_DEVICE_ATTR_RO(in1_label, label, DA9055_ADC_ADCIN1);209static SENSOR_DEVICE_ATTR_RO(in2_input, da9055_auto_ch, DA9055_ADC_ADCIN2);210static SENSOR_DEVICE_ATTR_RO(in2_label, label, DA9055_ADC_ADCIN2);211static SENSOR_DEVICE_ATTR_RO(in3_input, da9055_auto_ch, DA9055_ADC_ADCIN3);212static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9055_ADC_ADCIN3);213 214static SENSOR_DEVICE_ATTR_RO(temp1_input, da9055_tjunc, DA9055_ADC_TJUNC);215static SENSOR_DEVICE_ATTR_RO(temp1_label, label, DA9055_ADC_TJUNC);216 217static struct attribute *da9055_attrs[] = {218 &sensor_dev_attr_in0_input.dev_attr.attr,219 &sensor_dev_attr_in0_label.dev_attr.attr,220 &sensor_dev_attr_in1_input.dev_attr.attr,221 &sensor_dev_attr_in1_label.dev_attr.attr,222 &sensor_dev_attr_in2_input.dev_attr.attr,223 &sensor_dev_attr_in2_label.dev_attr.attr,224 &sensor_dev_attr_in3_input.dev_attr.attr,225 &sensor_dev_attr_in3_label.dev_attr.attr,226 227 &sensor_dev_attr_temp1_input.dev_attr.attr,228 &sensor_dev_attr_temp1_label.dev_attr.attr,229 NULL230};231 232ATTRIBUTE_GROUPS(da9055);233 234static int da9055_hwmon_probe(struct platform_device *pdev)235{236 struct device *dev = &pdev->dev;237 struct da9055_hwmon *hwmon;238 struct device *hwmon_dev;239 int hwmon_irq, ret;240 241 hwmon = devm_kzalloc(dev, sizeof(struct da9055_hwmon), GFP_KERNEL);242 if (!hwmon)243 return -ENOMEM;244 245 mutex_init(&hwmon->hwmon_lock);246 mutex_init(&hwmon->irq_lock);247 248 init_completion(&hwmon->done);249 hwmon->da9055 = dev_get_drvdata(pdev->dev.parent);250 251 hwmon_irq = platform_get_irq_byname(pdev, "HWMON");252 if (hwmon_irq < 0)253 return hwmon_irq;254 255 ret = devm_request_threaded_irq(&pdev->dev, hwmon_irq,256 NULL, da9055_auxadc_irq,257 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,258 "adc-irq", hwmon);259 if (ret != 0) {260 dev_err(hwmon->da9055->dev, "DA9055 ADC IRQ failed ret=%d\n",261 ret);262 return ret;263 }264 265 hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9055",266 hwmon,267 da9055_groups);268 return PTR_ERR_OR_ZERO(hwmon_dev);269}270 271static struct platform_driver da9055_hwmon_driver = {272 .probe = da9055_hwmon_probe,273 .driver = {274 .name = "da9055-hwmon",275 },276};277 278module_platform_driver(da9055_hwmon_driver);279 280MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");281MODULE_DESCRIPTION("DA9055 HWMON driver");282MODULE_LICENSE("GPL");283MODULE_ALIAS("platform:da9055-hwmon");284