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