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/delay.h>
  16 #include <linux/err.h>
  17 #include <linux/hwmon.h>
  18 #include <linux/hwmon-sysfs.h>
  19 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/platform_device.h>
  24
  25 #include <linux/mfd/da9052/da9052.h>
  26 #include <linux/mfd/da9052/reg.h>
  27
  28 struct da9052_hwmon {
  29         struct da9052   *da9052;
  30         struct device   *class_device;
  31         struct mutex    hwmon_lock;
  32 };
  33
  34 static const char * const input_names[] = {
  35         [DA9052_ADC_VDDOUT]     =       "VDDOUT",
  36         [DA9052_ADC_ICH]        =       "CHARGING CURRENT",
  37         [DA9052_ADC_TBAT]       =       "BATTERY TEMP",
  38         [DA9052_ADC_VBAT]       =       "BATTERY VOLTAGE",
  39         [DA9052_ADC_IN4]        =       "ADC IN4",
  40         [DA9052_ADC_IN5]        =       "ADC IN5",
  41         [DA9052_ADC_IN6]        =       "ADC IN6",
  42         [DA9052_ADC_TJUNC]      =       "BATTERY JUNCTION TEMP",
  43         [DA9052_ADC_VBBAT]      =       "BACK-UP BATTERY VOLTAGE",
  44 };
  45
  46 /* Conversion function for VDDOUT and VBAT */
  47 static inline int volt_reg_to_mV(int value)
  48 {
  49         return DIV_ROUND_CLOSEST(value * 1000, 512) + 2500;
  50 }
  51
  52 /* Conversion function for ADC channels 4, 5 and 6 */
  53 static inline int input_reg_to_mV(int value)
  54 {
  55         return DIV_ROUND_CLOSEST(value * 2500, 1023);
  56 }
  57
  58 /* Conversion function for VBBAT */
  59 static inline int vbbat_reg_to_mV(int value)
  60 {
  61         return DIV_ROUND_CLOSEST(value * 2500, 512);
  62 }
  63
  64 static int da9052_enable_vddout_channel(struct da9052 *da9052)
  65 {
  66         int ret;
  67
  68         ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG);
  69         if (ret < 0)
  70                 return ret;
  71
  72         ret |= DA9052_ADCCONT_AUTOVDDEN;
  73
  74         return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
  75 }
  76
  77 static int da9052_disable_vddout_channel(struct da9052 *da9052)
  78 {
  79         int ret;
  80
  81         ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG);
  82         if (ret < 0)
  83                 return ret;
  84
  85         ret &= ~DA9052_ADCCONT_AUTOVDDEN;
  86
  87         return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
  88 }
  89
  90 static ssize_t da9052_read_vddout(struct device *dev,
  91                                   struct device_attribute *devattr, char *buf)
  92 {
  93         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
  94         int ret, vdd;
  95
  96         mutex_lock(&hwmon->hwmon_lock);
  97
  98         ret = da9052_enable_vddout_channel(hwmon->da9052);
  99         if (ret < 0)
 100                 goto hwmon_err;
 101
 102         vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
 103         if (vdd < 0) {
 104                 ret = vdd;
 105                 goto hwmon_err_release;
 106         }
 107
 108         ret = da9052_disable_vddout_channel(hwmon->da9052);
 109         if (ret < 0)
 110                 goto hwmon_err;
 111
 112         mutex_unlock(&hwmon->hwmon_lock);
 113         return sprintf(buf, "%d\n", volt_reg_to_mV(vdd));
 114
 115 hwmon_err_release:
 116         da9052_disable_vddout_channel(hwmon->da9052);
 117 hwmon_err:
 118         mutex_unlock(&hwmon->hwmon_lock);
 119         return ret;
 120 }
 121
 122 static ssize_t da9052_read_ich(struct device *dev,
 123                                struct device_attribute *devattr, char *buf)
 124 {
 125         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 126         int ret;
 127
 128         ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
 129         if (ret < 0)
 130                 return ret;
 131
 132         /* Equivalent to 3.9mA/bit in register ICHG_AV */
 133         return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
 134 }
 135
 136 static ssize_t da9052_read_tbat(struct device *dev,
 137                                 struct device_attribute *devattr, char *buf)
 138 {
 139         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 140
 141         return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
 142 }
 143
 144 static ssize_t da9052_read_vbat(struct device *dev,
 145                                 struct device_attribute *devattr, char *buf)
 146 {
 147         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 148         int ret;
 149
 150         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
 151         if (ret < 0)
 152                 return ret;
 153
 154         return sprintf(buf, "%d\n", volt_reg_to_mV(ret));
 155 }
 156
 157 static ssize_t da9052_read_misc_channel(struct device *dev,
 158                                         struct device_attribute *devattr,
 159                                         char *buf)
 160 {
 161         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 162         int channel = to_sensor_dev_attr(devattr)->index;
 163         int ret;
 164
 165         ret = da9052_adc_manual_read(hwmon->da9052, channel);
 166         if (ret < 0)
 167                 return ret;
 168
 169         return sprintf(buf, "%d\n", input_reg_to_mV(ret));
 170 }
 171
 172 static ssize_t da9052_read_tjunc(struct device *dev,
 173                                  struct device_attribute *devattr, char *buf)
 174 {
 175         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 176         int tjunc;
 177         int toffset;
 178
 179         tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
 180         if (tjunc < 0)
 181                 return tjunc;
 182
 183         toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
 184         if (toffset < 0)
 185                 return toffset;
 186
 187         /*
 188          * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
 189          * T_OFFSET is a trim value used to improve accuracy of the result
 190          */
 191         return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
 192 }
 193
 194 static ssize_t da9052_read_vbbat(struct device *dev,
 195                                  struct device_attribute *devattr, char *buf)
 196 {
 197         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 198         int ret;
 199
 200         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
 201         if (ret < 0)
 202                 return ret;
 203
 204         return sprintf(buf, "%d\n", vbbat_reg_to_mV(ret));
 205 }
 206
 207 static ssize_t da9052_hwmon_show_name(struct device *dev,
 208                                       struct device_attribute *devattr,
 209                                       char *buf)
 210 {
 211         return sprintf(buf, "da9052-hwmon\n");
 212 }
 213
 214 static ssize_t show_label(struct device *dev,
 215                           struct device_attribute *devattr, char *buf)
 216 {
 217         return sprintf(buf, "%s\n",
 218                        input_names[to_sensor_dev_attr(devattr)->index]);
 219 }
 220
 221 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
 222                           DA9052_ADC_VDDOUT);
 223 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
 224                           DA9052_ADC_VDDOUT);
 225 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
 226                           DA9052_ADC_VBAT);
 227 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
 228                           DA9052_ADC_VBAT);
 229 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
 230                           DA9052_ADC_IN4);
 231 static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
 232                           DA9052_ADC_IN4);
 233 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
 234                           DA9052_ADC_IN5);
 235 static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
 236                           DA9052_ADC_IN5);
 237 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
 238                           DA9052_ADC_IN6);
 239 static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
 240                           DA9052_ADC_IN6);
 241 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
 242                           DA9052_ADC_VBBAT);
 243 static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
 244                           DA9052_ADC_VBBAT);
 245
 246 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
 247                           DA9052_ADC_ICH);
 248 static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
 249                           DA9052_ADC_ICH);
 250
 251 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL,
 252                           DA9052_ADC_TBAT);
 253 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
 254                           DA9052_ADC_TBAT);
 255 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL,
 256                           DA9052_ADC_TJUNC);
 257 static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL,
 258                           DA9052_ADC_TJUNC);
 259
 260 static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL);
 261
 262 static struct attribute *da9052_attr[] = {
 263         &dev_attr_name.attr,
 264         &sensor_dev_attr_in0_input.dev_attr.attr,
 265         &sensor_dev_attr_in0_label.dev_attr.attr,
 266         &sensor_dev_attr_in3_input.dev_attr.attr,
 267         &sensor_dev_attr_in3_label.dev_attr.attr,
 268         &sensor_dev_attr_in4_input.dev_attr.attr,
 269         &sensor_dev_attr_in4_label.dev_attr.attr,
 270         &sensor_dev_attr_in5_input.dev_attr.attr,
 271         &sensor_dev_attr_in5_label.dev_attr.attr,
 272         &sensor_dev_attr_in6_input.dev_attr.attr,
 273         &sensor_dev_attr_in6_label.dev_attr.attr,
 274         &sensor_dev_attr_in9_input.dev_attr.attr,
 275         &sensor_dev_attr_in9_label.dev_attr.attr,
 276         &sensor_dev_attr_curr1_input.dev_attr.attr,
 277         &sensor_dev_attr_curr1_label.dev_attr.attr,
 278         &sensor_dev_attr_temp2_input.dev_attr.attr,
 279         &sensor_dev_attr_temp2_label.dev_attr.attr,
 280         &sensor_dev_attr_temp8_input.dev_attr.attr,
 281         &sensor_dev_attr_temp8_label.dev_attr.attr,
 282         NULL
 283 };
 284
 285 static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr};
 286
 287 static int __devinit da9052_hwmon_probe(struct platform_device *pdev)
 288 {
 289         struct da9052_hwmon *hwmon;
 290         int ret;
 291
 292         hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9052_hwmon),
 293                              GFP_KERNEL);
 294         if (!hwmon)
 295                 return -ENOMEM;
 296
 297         mutex_init(&hwmon->hwmon_lock);
 298         hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
 299
 300         platform_set_drvdata(pdev, hwmon);
 301
 302         ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group);
 303         if (ret)
 304                 goto err_mem;
 305
 306         hwmon->class_device = hwmon_device_register(&pdev->dev);
 307         if (IS_ERR(hwmon->class_device)) {
 308                 ret = PTR_ERR(hwmon->class_device);
 309                 goto err_sysfs;
 310         }
 311
 312         return 0;
 313
 314 err_sysfs:
 315         sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
 316 err_mem:
 317         return ret;
 318 }
 319
 320 static int __devexit da9052_hwmon_remove(struct platform_device *pdev)
 321 {
 322         struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
 323
 324         hwmon_device_unregister(hwmon->class_device);
 325         sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
 326
 327         return 0;
 328 }
 329
 330 static struct platform_driver da9052_hwmon_driver = {
 331         .probe = da9052_hwmon_probe,
 332         .remove = __devexit_p(da9052_hwmon_remove),
 333         .driver = {
 334                 .name = "da9052-hwmon",
 335                 .owner = THIS_MODULE,
 336         },
 337 };
 338
 339 module_platform_driver(da9052_hwmon_driver);
 340
 341 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 342 MODULE_DESCRIPTION("DA9052 HWMON driver");
 343 MODULE_LICENSE("GPL");
 344 MODULE_ALIAS("platform:da9052-hwmon");