drivers/hwmon/da9055-hwmon.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * HWMON Driver for Dialog DA9055
   4  *
   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        102
  24 #define DA9055_VSYS_DIV 85
  25
  26 #define DA9055_ADC_VSYS 0
  27 #define DA9055_ADC_ADCIN1       1
  28 #define DA9055_ADC_ADCIN2       2
  29 #define DA9055_ADC_ADCIN3       3
  30 #define DA9055_ADC_TJUNC        4
  31
  32 struct da9055_hwmon {
  33         struct da9055   *da9055;
  34         struct mutex    hwmon_lock;
  35         struct mutex    irq_lock;
  36         struct completion done;
  37 };
  38
  39 static 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
  47 static 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
  55 static 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
 101 err:
 102         mutex_unlock(&hwmon->irq_lock);
 103         return ret;
 104 }
 105
 106 static 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 */
 116 static 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         else
 121                 return DIV_ROUND_CLOSEST(value * 1000, DA9055_ADCIN_DIV);
 122 }
 123
 124 static 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
 132 static 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
 138 static 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
 168 hwmon_err_release:
 169         da9055_disable_auto_mode(hwmon->da9055, channel);
 170 hwmon_err:
 171         mutex_unlock(&hwmon->hwmon_lock);
 172         return ret;
 173 }
 174
 175 static 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) + 307.6332
 192          * T_OFFSET is a trim value used to improve accuracy of the result
 193          */
 194         return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset)
 195                                                         + 3076332, 10000));
 196 }
 197
 198 static 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
 205 static SENSOR_DEVICE_ATTR_RO(in0_input, da9055_auto_ch, DA9055_ADC_VSYS);
 206 static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9055_ADC_VSYS);
 207 static SENSOR_DEVICE_ATTR_RO(in1_input, da9055_auto_ch, DA9055_ADC_ADCIN1);
 208 static SENSOR_DEVICE_ATTR_RO(in1_label, label, DA9055_ADC_ADCIN1);
 209 static SENSOR_DEVICE_ATTR_RO(in2_input, da9055_auto_ch, DA9055_ADC_ADCIN2);
 210 static SENSOR_DEVICE_ATTR_RO(in2_label, label, DA9055_ADC_ADCIN2);
 211 static SENSOR_DEVICE_ATTR_RO(in3_input, da9055_auto_ch, DA9055_ADC_ADCIN3);
 212 static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9055_ADC_ADCIN3);
 213
 214 static SENSOR_DEVICE_ATTR_RO(temp1_input, da9055_tjunc, DA9055_ADC_TJUNC);
 215 static SENSOR_DEVICE_ATTR_RO(temp1_label, label, DA9055_ADC_TJUNC);
 216
 217 static 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         NULL
 230 };
 231
 232 ATTRIBUTE_GROUPS(da9055);
 233
 234 static 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
 271 static struct platform_driver da9055_hwmon_driver = {
 272         .probe = da9055_hwmon_probe,
 273         .driver = {
 274                 .name = "da9055-hwmon",
 275         },
 276 };
 277
 278 module_platform_driver(da9055_hwmon_driver);
 279
 280 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 281 MODULE_DESCRIPTION("DA9055 HWMON driver");
 282 MODULE_LICENSE("GPL");
 283 MODULE_ALIAS("platform:da9055-hwmon");