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 device   *class_device;
  30         struct mutex    hwmon_lock;
  31 };
  32
  33 static const char * const input_names[] = {
  34         [DA9052_ADC_VDDOUT]     =       "VDDOUT",
  35         [DA9052_ADC_ICH]        =       "CHARGING CURRENT",
  36         [DA9052_ADC_TBAT]       =       "BATTERY TEMP",
  37         [DA9052_ADC_VBAT]       =       "BATTERY VOLTAGE",
  38         [DA9052_ADC_IN4]        =       "ADC IN4",
  39         [DA9052_ADC_IN5]        =       "ADC IN5",
  40         [DA9052_ADC_IN6]        =       "ADC IN6",
  41         [DA9052_ADC_TJUNC]      =       "BATTERY JUNCTION TEMP",
  42         [DA9052_ADC_VBBAT]      =       "BACK-UP BATTERY VOLTAGE",
  43 };
  44
  45 /* Conversion function for VDDOUT and VBAT */
  46 static inline int volt_reg_to_mV(int value)
  47 {
  48         return DIV_ROUND_CLOSEST(value * 1000, 512) + 2500;
  49 }
  50
  51 /* Conversion function for ADC channels 4, 5 and 6 */
  52 static inline int input_reg_to_mV(int value)
  53 {
  54         return DIV_ROUND_CLOSEST(value * 2500, 1023);
  55 }
  56
  57 /* Conversion function for VBBAT */
  58 static inline int vbbat_reg_to_mV(int value)
  59 {
  60         return DIV_ROUND_CLOSEST(value * 2500, 512);
  61 }
  62
  63 static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
  64 {
  65         return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
  66                                  DA9052_ADCCONT_AUTOVDDEN,
  67                                  DA9052_ADCCONT_AUTOVDDEN);
  68 }
  69
  70 static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
  71 {
  72         return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
  73                                  DA9052_ADCCONT_AUTOVDDEN, 0);
  74 }
  75
  76 static ssize_t da9052_read_vddout(struct device *dev,
  77                                   struct device_attribute *devattr, char *buf)
  78 {
  79         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
  80         int ret, vdd;
  81
  82         mutex_lock(&hwmon->hwmon_lock);
  83
  84         ret = da9052_enable_vddout_channel(hwmon->da9052);
  85         if (ret < 0)
  86                 goto hwmon_err;
  87
  88         vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
  89         if (vdd < 0) {
  90                 ret = vdd;
  91                 goto hwmon_err_release;
  92         }
  93
  94         ret = da9052_disable_vddout_channel(hwmon->da9052);
  95         if (ret < 0)
  96                 goto hwmon_err;
  97
  98         mutex_unlock(&hwmon->hwmon_lock);
  99         return sprintf(buf, "%d\n", volt_reg_to_mV(vdd));
 100
 101 hwmon_err_release:
 102         da9052_disable_vddout_channel(hwmon->da9052);
 103 hwmon_err:
 104         mutex_unlock(&hwmon->hwmon_lock);
 105         return ret;
 106 }
 107
 108 static ssize_t da9052_read_ich(struct device *dev,
 109                                struct device_attribute *devattr, char *buf)
 110 {
 111         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 112         int ret;
 113
 114         ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
 115         if (ret < 0)
 116                 return ret;
 117
 118         /* Equivalent to 3.9mA/bit in register ICHG_AV */
 119         return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
 120 }
 121
 122 static ssize_t da9052_read_tbat(struct device *dev,
 123                                 struct device_attribute *devattr, char *buf)
 124 {
 125         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 126
 127         return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
 128 }
 129
 130 static ssize_t da9052_read_vbat(struct device *dev,
 131                                 struct device_attribute *devattr, char *buf)
 132 {
 133         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 134         int ret;
 135
 136         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
 137         if (ret < 0)
 138                 return ret;
 139
 140         return sprintf(buf, "%d\n", volt_reg_to_mV(ret));
 141 }
 142
 143 static ssize_t da9052_read_misc_channel(struct device *dev,
 144                                         struct device_attribute *devattr,
 145                                         char *buf)
 146 {
 147         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 148         int channel = to_sensor_dev_attr(devattr)->index;
 149         int ret;
 150
 151         ret = da9052_adc_manual_read(hwmon->da9052, channel);
 152         if (ret < 0)
 153                 return ret;
 154
 155         return sprintf(buf, "%d\n", input_reg_to_mV(ret));
 156 }
 157
 158 static ssize_t da9052_read_tjunc(struct device *dev,
 159                                  struct device_attribute *devattr, char *buf)
 160 {
 161         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 162         int tjunc;
 163         int toffset;
 164
 165         tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
 166         if (tjunc < 0)
 167                 return tjunc;
 168
 169         toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
 170         if (toffset < 0)
 171                 return toffset;
 172
 173         /*
 174          * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
 175          * T_OFFSET is a trim value used to improve accuracy of the result
 176          */
 177         return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
 178 }
 179
 180 static ssize_t da9052_read_vbbat(struct device *dev,
 181                                  struct device_attribute *devattr, char *buf)
 182 {
 183         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
 184         int ret;
 185
 186         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
 187         if (ret < 0)
 188                 return ret;
 189
 190         return sprintf(buf, "%d\n", vbbat_reg_to_mV(ret));
 191 }
 192
 193 static ssize_t da9052_hwmon_show_name(struct device *dev,
 194                                       struct device_attribute *devattr,
 195                                       char *buf)
 196 {
 197         return sprintf(buf, "da9052-hwmon\n");
 198 }
 199
 200 static ssize_t show_label(struct device *dev,
 201                           struct device_attribute *devattr, char *buf)
 202 {
 203         return sprintf(buf, "%s\n",
 204                        input_names[to_sensor_dev_attr(devattr)->index]);
 205 }
 206
 207 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
 208                           DA9052_ADC_VDDOUT);
 209 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
 210                           DA9052_ADC_VDDOUT);
 211 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
 212                           DA9052_ADC_VBAT);
 213 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
 214                           DA9052_ADC_VBAT);
 215 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
 216                           DA9052_ADC_IN4);
 217 static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
 218                           DA9052_ADC_IN4);
 219 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
 220                           DA9052_ADC_IN5);
 221 static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
 222                           DA9052_ADC_IN5);
 223 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
 224                           DA9052_ADC_IN6);
 225 static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
 226                           DA9052_ADC_IN6);
 227 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
 228                           DA9052_ADC_VBBAT);
 229 static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
 230                           DA9052_ADC_VBBAT);
 231
 232 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
 233                           DA9052_ADC_ICH);
 234 static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
 235                           DA9052_ADC_ICH);
 236
 237 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL,
 238                           DA9052_ADC_TBAT);
 239 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
 240                           DA9052_ADC_TBAT);
 241 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL,
 242                           DA9052_ADC_TJUNC);
 243 static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL,
 244                           DA9052_ADC_TJUNC);
 245
 246 static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL);
 247
 248 static struct attribute *da9052_attr[] = {
 249         &dev_attr_name.attr,
 250         &sensor_dev_attr_in0_input.dev_attr.attr,
 251         &sensor_dev_attr_in0_label.dev_attr.attr,
 252         &sensor_dev_attr_in3_input.dev_attr.attr,
 253         &sensor_dev_attr_in3_label.dev_attr.attr,
 254         &sensor_dev_attr_in4_input.dev_attr.attr,
 255         &sensor_dev_attr_in4_label.dev_attr.attr,
 256         &sensor_dev_attr_in5_input.dev_attr.attr,
 257         &sensor_dev_attr_in5_label.dev_attr.attr,
 258         &sensor_dev_attr_in6_input.dev_attr.attr,
 259         &sensor_dev_attr_in6_label.dev_attr.attr,
 260         &sensor_dev_attr_in9_input.dev_attr.attr,
 261         &sensor_dev_attr_in9_label.dev_attr.attr,
 262         &sensor_dev_attr_curr1_input.dev_attr.attr,
 263         &sensor_dev_attr_curr1_label.dev_attr.attr,
 264         &sensor_dev_attr_temp2_input.dev_attr.attr,
 265         &sensor_dev_attr_temp2_label.dev_attr.attr,
 266         &sensor_dev_attr_temp8_input.dev_attr.attr,
 267         &sensor_dev_attr_temp8_label.dev_attr.attr,
 268         NULL
 269 };
 270
 271 static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr};
 272
 273 static int da9052_hwmon_probe(struct platform_device *pdev)
 274 {
 275         struct da9052_hwmon *hwmon;
 276         int ret;
 277
 278         hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9052_hwmon),
 279                              GFP_KERNEL);
 280         if (!hwmon)
 281                 return -ENOMEM;
 282
 283         mutex_init(&hwmon->hwmon_lock);
 284         hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
 285
 286         platform_set_drvdata(pdev, hwmon);
 287
 288         ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group);
 289         if (ret)
 290                 goto err_mem;
 291
 292         hwmon->class_device = hwmon_device_register(&pdev->dev);
 293         if (IS_ERR(hwmon->class_device)) {
 294                 ret = PTR_ERR(hwmon->class_device);
 295                 goto err_sysfs;
 296         }
 297
 298         return 0;
 299
 300 err_sysfs:
 301         sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
 302 err_mem:
 303         return ret;
 304 }
 305
 306 static int da9052_hwmon_remove(struct platform_device *pdev)
 307 {
 308         struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
 309
 310         hwmon_device_unregister(hwmon->class_device);
 311         sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
 312
 313         return 0;
 314 }
 315
 316 static struct platform_driver da9052_hwmon_driver = {
 317         .probe = da9052_hwmon_probe,
 318         .remove = da9052_hwmon_remove,
 319         .driver = {
 320                 .name = "da9052-hwmon",
 321                 .owner = THIS_MODULE,
 322         },
 323 };
 324
 325 module_platform_driver(da9052_hwmon_driver);
 326
 327 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 328 MODULE_DESCRIPTION("DA9052 HWMON driver");
 329 MODULE_LICENSE("GPL");
 330 MODULE_ALIAS("platform:da9052-hwmon");