drivers/hwmon/da9055-hwmon.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * HWMON Driver for Dialog DA9055
0004  *
0005  * Copyright(c) 2012 Dialog Semiconductor Ltd.
0006  *
0007  * Author: David Dajun Chen <dchen@diasemi.com>
0008  */
0009
0010 #include <linux/delay.h>
0011 #include <linux/err.h>
0012 #include <linux/hwmon.h>
0013 #include <linux/hwmon-sysfs.h>
0014 #include <linux/init.h>
0015 #include <linux/kernel.h>
0016 #include <linux/module.h>
0017 #include <linux/platform_device.h>
0018 #include <linux/completion.h>
0019
0020 #include <linux/mfd/da9055/core.h>
0021 #include <linux/mfd/da9055/reg.h>
0022
0023 #define DA9055_ADCIN_DIV    102
0024 #define DA9055_VSYS_DIV 85
0025
0026 #define DA9055_ADC_VSYS 0
0027 #define DA9055_ADC_ADCIN1   1
0028 #define DA9055_ADC_ADCIN2   2
0029 #define DA9055_ADC_ADCIN3   3
0030 #define DA9055_ADC_TJUNC    4
0031
0032 struct da9055_hwmon {
0033     struct da9055   *da9055;
0034     struct mutex    hwmon_lock;
0035     struct mutex    irq_lock;
0036     struct completion done;
0037 };
0038
0039 static const char * const input_names[] = {
0040     [DA9055_ADC_VSYS]   = "VSYS",
0041     [DA9055_ADC_ADCIN1] = "ADC IN1",
0042     [DA9055_ADC_ADCIN2] = "ADC IN2",
0043     [DA9055_ADC_ADCIN3] = "ADC IN3",
0044     [DA9055_ADC_TJUNC]  = "CHIP TEMP",
0045 };
0046
0047 static const u8 chan_mux[DA9055_ADC_TJUNC + 1] = {
0048     [DA9055_ADC_VSYS]   = DA9055_ADC_MUX_VSYS,
0049     [DA9055_ADC_ADCIN1] = DA9055_ADC_MUX_ADCIN1,
0050     [DA9055_ADC_ADCIN2] = DA9055_ADC_MUX_ADCIN2,
0051     [DA9055_ADC_ADCIN3] = DA9055_ADC_MUX_ADCIN3,
0052     [DA9055_ADC_TJUNC]  = DA9055_ADC_MUX_T_SENSE,
0053 };
0054
0055 static int da9055_adc_manual_read(struct da9055_hwmon *hwmon,
0056                     unsigned char channel)
0057 {
0058     int ret;
0059     unsigned short calc_data;
0060     unsigned short data;
0061     unsigned char mux_sel;
0062     struct da9055 *da9055 = hwmon->da9055;
0063
0064     if (channel > DA9055_ADC_TJUNC)
0065         return -EINVAL;
0066
0067     mutex_lock(&hwmon->irq_lock);
0068
0069     /* Selects desired MUX for manual conversion */
0070     mux_sel = chan_mux[channel] | DA9055_ADC_MAN_CONV;
0071
0072     ret = da9055_reg_write(da9055, DA9055_REG_ADC_MAN, mux_sel);
0073     if (ret < 0)
0074         goto err;
0075
0076     /* Wait for an interrupt */
0077     if (!wait_for_completion_timeout(&hwmon->done,
0078                     msecs_to_jiffies(500))) {
0079         dev_err(da9055->dev,
0080             "timeout waiting for ADC conversion interrupt\n");
0081         ret = -ETIMEDOUT;
0082         goto err;
0083     }
0084
0085     ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_H);
0086     if (ret < 0)
0087         goto err;
0088
0089     calc_data = (unsigned short)ret;
0090     data = calc_data << 2;
0091
0092     ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_L);
0093     if (ret < 0)
0094         goto err;
0095
0096     calc_data = (unsigned short)(ret & DA9055_ADC_LSB_MASK);
0097     data |= calc_data;
0098
0099     ret = data;
0100
0101 err:
0102     mutex_unlock(&hwmon->irq_lock);
0103     return ret;
0104 }
0105
0106 static irqreturn_t da9055_auxadc_irq(int irq, void *irq_data)
0107 {
0108     struct da9055_hwmon *hwmon = irq_data;
0109
0110     complete(&hwmon->done);
0111
0112     return IRQ_HANDLED;
0113 }
0114
0115 /* Conversion function for VSYS and ADCINx */
0116 static inline int volt_reg_to_mv(int value, int channel)
0117 {
0118     if (channel == DA9055_ADC_VSYS)
0119         return DIV_ROUND_CLOSEST(value * 1000, DA9055_VSYS_DIV) + 2500;
0120     else
0121         return DIV_ROUND_CLOSEST(value * 1000, DA9055_ADCIN_DIV);
0122 }
0123
0124 static int da9055_enable_auto_mode(struct da9055 *da9055, int channel)
0125 {
0126
0127     return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel,
0128                 1 << channel);
0129
0130 }
0131
0132 static int da9055_disable_auto_mode(struct da9055 *da9055, int channel)
0133 {
0134
0135     return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 0);
0136 }
0137
0138 static ssize_t da9055_auto_ch_show(struct device *dev,
0139                    struct device_attribute *devattr,
0140                    char *buf)
0141 {
0142     struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
0143     int ret, adc;
0144     int channel = to_sensor_dev_attr(devattr)->index;
0145
0146     mutex_lock(&hwmon->hwmon_lock);
0147
0148     ret = da9055_enable_auto_mode(hwmon->da9055, channel);
0149     if (ret < 0)
0150         goto hwmon_err;
0151
0152     usleep_range(10000, 10500);
0153
0154     adc = da9055_reg_read(hwmon->da9055, DA9055_REG_VSYS_RES + channel);
0155     if (adc < 0) {
0156         ret = adc;
0157         goto hwmon_err_release;
0158     }
0159
0160     ret = da9055_disable_auto_mode(hwmon->da9055, channel);
0161     if (ret < 0)
0162         goto hwmon_err;
0163
0164     mutex_unlock(&hwmon->hwmon_lock);
0165
0166     return sprintf(buf, "%d\n", volt_reg_to_mv(adc, channel));
0167
0168 hwmon_err_release:
0169     da9055_disable_auto_mode(hwmon->da9055, channel);
0170 hwmon_err:
0171     mutex_unlock(&hwmon->hwmon_lock);
0172     return ret;
0173 }
0174
0175 static ssize_t da9055_tjunc_show(struct device *dev,
0176                  struct device_attribute *devattr, char *buf)
0177 {
0178     struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
0179     int tjunc;
0180     int toffset;
0181
0182     tjunc = da9055_adc_manual_read(hwmon, DA9055_ADC_TJUNC);
0183     if (tjunc < 0)
0184         return tjunc;
0185
0186     toffset = da9055_reg_read(hwmon->da9055, DA9055_REG_T_OFFSET);
0187     if (toffset < 0)
0188         return toffset;
0189
0190     /*
0191      * Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332
0192      * T_OFFSET is a trim value used to improve accuracy of the result
0193      */
0194     return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset)
0195                             + 3076332, 10000));
0196 }
0197
0198 static ssize_t label_show(struct device *dev,
0199               struct device_attribute *devattr, char *buf)
0200 {
0201     return sprintf(buf, "%s\n",
0202                input_names[to_sensor_dev_attr(devattr)->index]);
0203 }
0204
0205 static SENSOR_DEVICE_ATTR_RO(in0_input, da9055_auto_ch, DA9055_ADC_VSYS);
0206 static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9055_ADC_VSYS);
0207 static SENSOR_DEVICE_ATTR_RO(in1_input, da9055_auto_ch, DA9055_ADC_ADCIN1);
0208 static SENSOR_DEVICE_ATTR_RO(in1_label, label, DA9055_ADC_ADCIN1);
0209 static SENSOR_DEVICE_ATTR_RO(in2_input, da9055_auto_ch, DA9055_ADC_ADCIN2);
0210 static SENSOR_DEVICE_ATTR_RO(in2_label, label, DA9055_ADC_ADCIN2);
0211 static SENSOR_DEVICE_ATTR_RO(in3_input, da9055_auto_ch, DA9055_ADC_ADCIN3);
0212 static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9055_ADC_ADCIN3);
0213
0214 static SENSOR_DEVICE_ATTR_RO(temp1_input, da9055_tjunc, DA9055_ADC_TJUNC);
0215 static SENSOR_DEVICE_ATTR_RO(temp1_label, label, DA9055_ADC_TJUNC);
0216
0217 static struct attribute *da9055_attrs[] = {
0218     &sensor_dev_attr_in0_input.dev_attr.attr,
0219     &sensor_dev_attr_in0_label.dev_attr.attr,
0220     &sensor_dev_attr_in1_input.dev_attr.attr,
0221     &sensor_dev_attr_in1_label.dev_attr.attr,
0222     &sensor_dev_attr_in2_input.dev_attr.attr,
0223     &sensor_dev_attr_in2_label.dev_attr.attr,
0224     &sensor_dev_attr_in3_input.dev_attr.attr,
0225     &sensor_dev_attr_in3_label.dev_attr.attr,
0226
0227     &sensor_dev_attr_temp1_input.dev_attr.attr,
0228     &sensor_dev_attr_temp1_label.dev_attr.attr,
0229     NULL
0230 };
0231
0232 ATTRIBUTE_GROUPS(da9055);
0233
0234 static int da9055_hwmon_probe(struct platform_device *pdev)
0235 {
0236     struct device *dev = &pdev->dev;
0237     struct da9055_hwmon *hwmon;
0238     struct device *hwmon_dev;
0239     int hwmon_irq, ret;
0240
0241     hwmon = devm_kzalloc(dev, sizeof(struct da9055_hwmon), GFP_KERNEL);
0242     if (!hwmon)
0243         return -ENOMEM;
0244
0245     mutex_init(&hwmon->hwmon_lock);
0246     mutex_init(&hwmon->irq_lock);
0247
0248     init_completion(&hwmon->done);
0249     hwmon->da9055 = dev_get_drvdata(pdev->dev.parent);
0250
0251     hwmon_irq = platform_get_irq_byname(pdev, "HWMON");
0252     if (hwmon_irq < 0)
0253         return hwmon_irq;
0254
0255     ret = devm_request_threaded_irq(&pdev->dev, hwmon_irq,
0256                     NULL, da9055_auxadc_irq,
0257                     IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
0258                     "adc-irq", hwmon);
0259     if (ret != 0) {
0260         dev_err(hwmon->da9055->dev, "DA9055 ADC IRQ failed ret=%d\n",
0261             ret);
0262         return ret;
0263     }
0264
0265     hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9055",
0266                                hwmon,
0267                                da9055_groups);
0268     return PTR_ERR_OR_ZERO(hwmon_dev);
0269 }
0270
0271 static struct platform_driver da9055_hwmon_driver = {
0272     .probe = da9055_hwmon_probe,
0273     .driver = {
0274         .name = "da9055-hwmon",
0275     },
0276 };
0277
0278 module_platform_driver(da9055_hwmon_driver);
0279
0280 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
0281 MODULE_DESCRIPTION("DA9055 HWMON driver");
0282 MODULE_LICENSE("GPL");
0283 MODULE_ALIAS("platform:da9055-hwmon");