drivers/hwmon/da9052-hwmon.c

   1 /*
   2  * HWMON Driver for Dialog DA9052
   3  *
   4  * Copyright(c) 2012 Dialog Semiconductor Ltd.
   5  *
   6  * Author: David Dajun Chen <dchen@diasemi.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14
  15 #include <linux/err.h>
  16 #include <linux/hwmon.h>
  17 #include <linux/hwmon-sysfs.h>
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22 #include <linux/platform_device.h>
  23
  24 #include <linux/mfd/da9052/da9052.h>
  25 #include <linux/mfd/da9052/reg.h>
  26
  27 struct da9052_hwmon {
  28         struct da9052   *da9052;
  29         struct mutex    hwmon_lock;
  30 };
  31
  32 static const char * const input_names[] = {
  33         [DA9052_ADC_VDDOUT]     =       "VDDOUT",
  34         [DA9052_ADC_ICH]        =       "CHARGING CURRENT",
  35         [DA9052_ADC_TBAT]       =       "BATTERY TEMP",
  36         [DA9052_ADC_VBAT]       =       "BATTERY VOLTAGE",
  37         [DA9052_ADC_IN4]        =       "ADC IN4",
  38         [DA9052_ADC_IN5]        =       "ADC IN5",
  39         [DA9052_ADC_IN6]        =       "ADC IN6",
  40         [DA9052_ADC_TJUNC]      =       "BATTERY JUNCTION TEMP",
  41         [DA9052_ADC_VBBAT]      =       "BACK-UP BATTERY VOLTAGE",
  42 };
  43
  44 /* Conversion function for VDDOUT and VBAT */
  45 static inline int volt_reg_to_mv(int value)
  46 {
  47         return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500;
  48 }
  49
  50 /* Conversion function for ADC channels 4, 5 and 6 */
  51 static inline int input_reg_to_mv(int value)
  52 {
  53         return DIV_ROUND_CLOSEST(value * 2500, 1023);
  54 }
  55
  56 /* Conversion function for VBBAT */
  57 static inline int vbbat_reg_to_mv(int value)
  58 {
  59         return DIV_ROUND_CLOSEST(value * 5000, 1023);
  60 }
  61
  62 static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
  63 {
  64         return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
  65                                  DA9052_ADCCONT_AUTOVDDEN,
  66                                  DA9052_ADCCONT_AUTOVDDEN);
  67 }
  68
  69 static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
  70 {
  71         return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
  72                                  DA9052_ADCCONT_AUTOVDDEN, 0);
  73 }
  74
  75 static ssize_t da9052_read_vddout(struct device *dev,
  76                                   struct device_attribute *devattr, char *buf)
  77 {
  78         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
  79         int ret, vdd;
  80
  81         mutex_lock(&hwmon->hwmon_lock);
  82
  83         ret = da9052_enable_vddout_channel(hwmon->da9052);
  84         if (ret < 0)
  85                 goto hwmon_err;
  86
  87         vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
  88         if (vdd < 0) {
  89                 ret = vdd;
  90                 goto hwmon_err_release;
  91         }
  92
  93         ret = da9052_disable_vddout_channel(hwmon->da9052);
  94         if (ret < 0)
  95                 goto hwmon_err;
  96
  97         mutex_unlock(&hwmon->hwmon_lock);
  98         return sprintf(buf, "%d\n", volt_reg_to_mv(vdd));
  99
 100 hwmon_err_release:
 101         da9052_disable_vddout_channel(hwmon->da9052);
 102 hwmon_err:
 103         mutex_unlock(&hwmon->hwmon_lock);
 104         return ret;
 105 }
 106
 107 static ssize_t da9052_read_ich(struct device *dev,
 108                                struct device_attribute *devattr, char *buf)
 109 {
 110         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 111         int ret;
 112
 113         ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
 114         if (ret < 0)
 115                 return ret;
 116
 117         /* Equivalent to 3.9mA/bit in register ICHG_AV */
 118         return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
 119 }
 120
 121 static ssize_t da9052_read_tbat(struct device *dev,
 122                                 struct device_attribute *devattr, char *buf)
 123 {
 124         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 125
 126         return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
 127 }
 128
 129 static ssize_t da9052_read_vbat(struct device *dev,
 130                                 struct device_attribute *devattr, char *buf)
 131 {
 132         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 133         int ret;
 134
 135         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
 136         if (ret < 0)
 137                 return ret;
 138
 139         return sprintf(buf, "%d\n", volt_reg_to_mv(ret));
 140 }
 141
 142 static ssize_t da9052_read_misc_channel(struct device *dev,
 143                                         struct device_attribute *devattr,
 144                                         char *buf)
 145 {
 146         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 147         int channel = to_sensor_dev_attr(devattr)->index;
 148         int ret;
 149
 150         ret = da9052_adc_manual_read(hwmon->da9052, channel);
 151         if (ret < 0)
 152                 return ret;
 153
 154         return sprintf(buf, "%d\n", input_reg_to_mv(ret));
 155 }
 156
 157 static ssize_t da9052_read_tjunc(struct device *dev,
 158                                  struct device_attribute *devattr, char *buf)
 159 {
 160         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 161         int tjunc;
 162         int toffset;
 163
 164         tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
 165         if (tjunc < 0)
 166                 return tjunc;
 167
 168         toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
 169         if (toffset < 0)
 170                 return toffset;
 171
 172         /*
 173          * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
 174          * T_OFFSET is a trim value used to improve accuracy of the result
 175          */
 176         return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
 177 }
 178
 179 static ssize_t da9052_read_vbbat(struct device *dev,
 180                                  struct device_attribute *devattr, char *buf)
 181 {
 182         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 183         int ret;
 184
 185         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
 186         if (ret < 0)
 187                 return ret;
 188
 189         return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
 190 }
 191
 192 static ssize_t show_label(struct device *dev,
 193                           struct device_attribute *devattr, char *buf)
 194 {
 195         return sprintf(buf, "%s\n",
 196                        input_names[to_sensor_dev_attr(devattr)->index]);
 197 }
 198
 199 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
 200                           DA9052_ADC_VDDOUT);
 201 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
 202                           DA9052_ADC_VDDOUT);
 203 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
 204                           DA9052_ADC_VBAT);
 205 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
 206                           DA9052_ADC_VBAT);
 207 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
 208                           DA9052_ADC_IN4);
 209 static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
 210                           DA9052_ADC_IN4);
 211 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
 212                           DA9052_ADC_IN5);
 213 static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
 214                           DA9052_ADC_IN5);
 215 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
 216                           DA9052_ADC_IN6);
 217 static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
 218                           DA9052_ADC_IN6);
 219 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
 220                           DA9052_ADC_VBBAT);
 221 static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
 222                           DA9052_ADC_VBBAT);
 223
 224 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
 225                           DA9052_ADC_ICH);
 226 static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
 227                           DA9052_ADC_ICH);
 228
 229 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL,
 230                           DA9052_ADC_TBAT);
 231 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
 232                           DA9052_ADC_TBAT);
 233 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL,
 234                           DA9052_ADC_TJUNC);
 235 static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL,
 236                           DA9052_ADC_TJUNC);
 237
 238 static struct attribute *da9052_attrs[] = {
 239         &sensor_dev_attr_in0_input.dev_attr.attr,
 240         &sensor_dev_attr_in0_label.dev_attr.attr,
 241         &sensor_dev_attr_in3_input.dev_attr.attr,
 242         &sensor_dev_attr_in3_label.dev_attr.attr,
 243         &sensor_dev_attr_in4_input.dev_attr.attr,
 244         &sensor_dev_attr_in4_label.dev_attr.attr,
 245         &sensor_dev_attr_in5_input.dev_attr.attr,
 246         &sensor_dev_attr_in5_label.dev_attr.attr,
 247         &sensor_dev_attr_in6_input.dev_attr.attr,
 248         &sensor_dev_attr_in6_label.dev_attr.attr,
 249         &sensor_dev_attr_in9_input.dev_attr.attr,
 250         &sensor_dev_attr_in9_label.dev_attr.attr,
 251         &sensor_dev_attr_curr1_input.dev_attr.attr,
 252         &sensor_dev_attr_curr1_label.dev_attr.attr,
 253         &sensor_dev_attr_temp2_input.dev_attr.attr,
 254         &sensor_dev_attr_temp2_label.dev_attr.attr,
 255         &sensor_dev_attr_temp8_input.dev_attr.attr,
 256         &sensor_dev_attr_temp8_label.dev_attr.attr,
 257         NULL
 258 };
 259
 260 ATTRIBUTE_GROUPS(da9052);
 261
 262 static int da9052_hwmon_probe(struct platform_device *pdev)
 263 {
 264         struct device *dev = &pdev->dev;
 265         struct da9052_hwmon *hwmon;
 266         struct device *hwmon_dev;
 267
 268         hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
 269         if (!hwmon)
 270                 return -ENOMEM;
 271
 272         mutex_init(&hwmon->hwmon_lock);
 273         hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
 274
 275         hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
 276                                                            hwmon,
 277                                                            da9052_groups);
 278         return PTR_ERR_OR_ZERO(hwmon_dev);
 279 }
 280
 281 static struct platform_driver da9052_hwmon_driver = {
 282         .probe = da9052_hwmon_probe,
 283         .driver = {
 284                 .name = "da9052-hwmon",
 285                 .owner = THIS_MODULE,
 286         },
 287 };
 288
 289 module_platform_driver(da9052_hwmon_driver);
 290
 291 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 292 MODULE_DESCRIPTION("DA9052 HWMON driver");
 293 MODULE_LICENSE("GPL");
 294 MODULE_ALIAS("platform:da9052-hwmon");