root/drivers/hwmon/mc13783-adc.c

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DEFINITIONS

This source file includes following definitions.
  1. name_show
  2. mc13783_adc_read
  3. mc13783_adc_bp_show
  4. mc13783_adc_gp_show
  5. mc13783_adc_uid_show
  6. mc13783_adc_temp_show
  7. mc13783_adc_use_touchscreen
  8. mc13783_adc_probe
  9. mc13783_adc_remove

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for the ADC on Freescale Semiconductor MC13783 and MC13892 PMICs.
   4  *
   5  * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
   6  * Copyright (C) 2009 Sascha Hauer, Pengutronix
   7  */
   8 
   9 #include <linux/mfd/mc13xxx.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/hwmon-sysfs.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/mod_devicetable.h>
  15 #include <linux/hwmon.h>
  16 #include <linux/slab.h>
  17 #include <linux/init.h>
  18 #include <linux/err.h>
  19 
  20 #define DRIVER_NAME     "mc13783-adc"
  21 
  22 /* platform device id driver data */
  23 #define MC13783_ADC_16CHANS     1
  24 #define MC13783_ADC_BPDIV2      2
  25 
  26 struct mc13783_adc_priv {
  27         struct mc13xxx *mc13xxx;
  28         struct device *hwmon_dev;
  29         char name[PLATFORM_NAME_SIZE];
  30 };
  31 
  32 static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
  33                          char *buf)
  34 {
  35         struct mc13783_adc_priv *priv = dev_get_drvdata(dev);
  36 
  37         return sprintf(buf, "%s\n", priv->name);
  38 }
  39 
  40 static int mc13783_adc_read(struct device *dev,
  41                 struct device_attribute *devattr, unsigned int *val)
  42 {
  43         struct mc13783_adc_priv *priv = dev_get_drvdata(dev);
  44         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  45         unsigned int channel = attr->index;
  46         unsigned int sample[4];
  47         int ret;
  48 
  49         ret = mc13xxx_adc_do_conversion(priv->mc13xxx,
  50                         MC13XXX_ADC_MODE_MULT_CHAN,
  51                         channel, 0, 0, sample);
  52         if (ret)
  53                 return ret;
  54 
  55         /* ADIN7 subchannels */
  56         if (channel >= 16)
  57                 channel = 7;
  58 
  59         channel &= 0x7;
  60 
  61         *val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;
  62 
  63         return 0;
  64 }
  65 
  66 static ssize_t mc13783_adc_bp_show(struct device *dev,
  67                                    struct device_attribute *devattr,
  68                                    char *buf)
  69 {
  70         unsigned val;
  71         struct platform_device *pdev = to_platform_device(dev);
  72         kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
  73         int ret = mc13783_adc_read(dev, devattr, &val);
  74 
  75         if (ret)
  76                 return ret;
  77 
  78         if (driver_data & MC13783_ADC_BPDIV2)
  79                 val = DIV_ROUND_CLOSEST(val * 9, 2);
  80         else
  81                 /*
  82                  * BP (channel 2) reports with offset 2.4V to the actual value
  83                  * to fit the input range of the ADC.  unit = 2.25mV = 9/4 mV.
  84                  */
  85                 val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400;
  86 
  87         return sprintf(buf, "%u\n", val);
  88 }
  89 
  90 static ssize_t mc13783_adc_gp_show(struct device *dev,
  91                                    struct device_attribute *devattr,
  92                                    char *buf)
  93 {
  94         unsigned val;
  95         int ret = mc13783_adc_read(dev, devattr, &val);
  96 
  97         if (ret)
  98                 return ret;
  99 
 100         /*
 101          * input range is [0, 2.3V], val has 10 bits, so each bit
 102          * is worth 9/4 mV.
 103          */
 104         val = DIV_ROUND_CLOSEST(val * 9, 4);
 105 
 106         return sprintf(buf, "%u\n", val);
 107 }
 108 
 109 static ssize_t mc13783_adc_uid_show(struct device *dev,
 110                                     struct device_attribute *devattr,
 111                                     char *buf)
 112 {
 113         unsigned int val;
 114         struct platform_device *pdev = to_platform_device(dev);
 115         kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
 116         int ret = mc13783_adc_read(dev, devattr, &val);
 117 
 118         if (ret)
 119                 return ret;
 120 
 121         if (driver_data & MC13783_ADC_BPDIV2)
 122                 /* MC13892 have 1/2 divider, input range is [0, 4.800V] */
 123                 val = DIV_ROUND_CLOSEST(val * 4800, 1024);
 124         else
 125                 /* MC13783 have 0.9 divider, input range is [0, 2.555V] */
 126                 val = DIV_ROUND_CLOSEST(val * 2555, 1024);
 127 
 128         return sprintf(buf, "%u\n", val);
 129 }
 130 
 131 static ssize_t mc13783_adc_temp_show(struct device *dev,
 132                                      struct device_attribute *devattr,
 133                                      char *buf)
 134 {
 135         unsigned int val;
 136         struct platform_device *pdev = to_platform_device(dev);
 137         kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
 138         int ret = mc13783_adc_read(dev, devattr, &val);
 139 
 140         if (ret)
 141                 return ret;
 142 
 143         if (driver_data & MC13783_ADC_BPDIV2) {
 144                 /*
 145                  * MC13892:
 146                  * Die Temperature Read Out Code at 25C 680
 147                  * Temperature change per LSB +0.4244C
 148                  */
 149                 ret = DIV_ROUND_CLOSEST(-2635920 + val * 4244, 10);
 150         } else {
 151                 /*
 152                  * MC13783:
 153                  * Die Temperature Read Out Code at 25C 282
 154                  * Temperature change per LSB -1.14C
 155                  */
 156                 ret = 346480 - 1140 * val;
 157         }
 158 
 159         return sprintf(buf, "%d\n", ret);
 160 }
 161 
 162 static DEVICE_ATTR_RO(name);
 163 static SENSOR_DEVICE_ATTR_RO(in2_input, mc13783_adc_bp, 2);
 164 static SENSOR_DEVICE_ATTR_RO(in5_input, mc13783_adc_gp, 5);
 165 static SENSOR_DEVICE_ATTR_RO(in6_input, mc13783_adc_gp, 6);
 166 static SENSOR_DEVICE_ATTR_RO(in7_input, mc13783_adc_gp, 7);
 167 static SENSOR_DEVICE_ATTR_RO(in8_input, mc13783_adc_gp, 8);
 168 static SENSOR_DEVICE_ATTR_RO(in9_input, mc13783_adc_gp, 9);
 169 static SENSOR_DEVICE_ATTR_RO(in10_input, mc13783_adc_gp, 10);
 170 static SENSOR_DEVICE_ATTR_RO(in11_input, mc13783_adc_gp, 11);
 171 static SENSOR_DEVICE_ATTR_RO(in12_input, mc13783_adc_gp, 12);
 172 static SENSOR_DEVICE_ATTR_RO(in13_input, mc13783_adc_gp, 13);
 173 static SENSOR_DEVICE_ATTR_RO(in14_input, mc13783_adc_gp, 14);
 174 static SENSOR_DEVICE_ATTR_RO(in15_input, mc13783_adc_gp, 15);
 175 static SENSOR_DEVICE_ATTR_RO(in16_input, mc13783_adc_uid, 16);
 176 static SENSOR_DEVICE_ATTR_RO(temp1_input, mc13783_adc_temp, 17);
 177 
 178 static struct attribute *mc13783_attr_base[] = {
 179         &dev_attr_name.attr,
 180         &sensor_dev_attr_in2_input.dev_attr.attr,
 181         &sensor_dev_attr_in5_input.dev_attr.attr,
 182         &sensor_dev_attr_in6_input.dev_attr.attr,
 183         &sensor_dev_attr_in7_input.dev_attr.attr,
 184         &sensor_dev_attr_in16_input.dev_attr.attr,
 185         &sensor_dev_attr_temp1_input.dev_attr.attr,
 186         NULL
 187 };
 188 
 189 static const struct attribute_group mc13783_group_base = {
 190         .attrs = mc13783_attr_base,
 191 };
 192 
 193 /* these are only used if MC13783_ADC_16CHANS is provided in driver data */
 194 static struct attribute *mc13783_attr_16chans[] = {
 195         &sensor_dev_attr_in8_input.dev_attr.attr,
 196         &sensor_dev_attr_in9_input.dev_attr.attr,
 197         &sensor_dev_attr_in10_input.dev_attr.attr,
 198         &sensor_dev_attr_in11_input.dev_attr.attr,
 199         NULL
 200 };
 201 
 202 static const struct attribute_group mc13783_group_16chans = {
 203         .attrs = mc13783_attr_16chans,
 204 };
 205 
 206 /* last four channels may be occupied by the touchscreen */
 207 static struct attribute *mc13783_attr_ts[] = {
 208         &sensor_dev_attr_in12_input.dev_attr.attr,
 209         &sensor_dev_attr_in13_input.dev_attr.attr,
 210         &sensor_dev_attr_in14_input.dev_attr.attr,
 211         &sensor_dev_attr_in15_input.dev_attr.attr,
 212         NULL
 213 };
 214 
 215 static const struct attribute_group mc13783_group_ts = {
 216         .attrs = mc13783_attr_ts,
 217 };
 218 
 219 static int mc13783_adc_use_touchscreen(struct platform_device *pdev)
 220 {
 221         struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
 222         unsigned flags = mc13xxx_get_flags(priv->mc13xxx);
 223 
 224         return flags & MC13XXX_USE_TOUCHSCREEN;
 225 }
 226 
 227 static int __init mc13783_adc_probe(struct platform_device *pdev)
 228 {
 229         struct mc13783_adc_priv *priv;
 230         int ret;
 231         const struct platform_device_id *id = platform_get_device_id(pdev);
 232         char *dash;
 233 
 234         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 235         if (!priv)
 236                 return -ENOMEM;
 237 
 238         priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
 239         snprintf(priv->name, ARRAY_SIZE(priv->name), "%s", id->name);
 240         dash = strchr(priv->name, '-');
 241         if (dash)
 242                 *dash = '\0';
 243 
 244         platform_set_drvdata(pdev, priv);
 245 
 246         /* Register sysfs hooks */
 247         ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_base);
 248         if (ret)
 249                 return ret;
 250 
 251         if (id->driver_data & MC13783_ADC_16CHANS) {
 252                 ret = sysfs_create_group(&pdev->dev.kobj,
 253                                 &mc13783_group_16chans);
 254                 if (ret)
 255                         goto out_err_create_16chans;
 256         }
 257 
 258         if (!mc13783_adc_use_touchscreen(pdev)) {
 259                 ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts);
 260                 if (ret)
 261                         goto out_err_create_ts;
 262         }
 263 
 264         priv->hwmon_dev = hwmon_device_register(&pdev->dev);
 265         if (IS_ERR(priv->hwmon_dev)) {
 266                 ret = PTR_ERR(priv->hwmon_dev);
 267                 dev_err(&pdev->dev,
 268                                 "hwmon_device_register failed with %d.\n", ret);
 269                 goto out_err_register;
 270         }
 271 
 272         return 0;
 273 
 274 out_err_register:
 275 
 276         if (!mc13783_adc_use_touchscreen(pdev))
 277                 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
 278 out_err_create_ts:
 279 
 280         if (id->driver_data & MC13783_ADC_16CHANS)
 281                 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);
 282 out_err_create_16chans:
 283 
 284         sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);
 285         return ret;
 286 }
 287 
 288 static int mc13783_adc_remove(struct platform_device *pdev)
 289 {
 290         struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
 291         kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
 292 
 293         hwmon_device_unregister(priv->hwmon_dev);
 294 
 295         if (!mc13783_adc_use_touchscreen(pdev))
 296                 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
 297 
 298         if (driver_data & MC13783_ADC_16CHANS)
 299                 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);
 300 
 301         sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);
 302 
 303         return 0;
 304 }
 305 
 306 static const struct platform_device_id mc13783_adc_idtable[] = {
 307         {
 308                 .name = "mc13783-adc",
 309                 .driver_data = MC13783_ADC_16CHANS,
 310         }, {
 311                 .name = "mc13892-adc",
 312                 .driver_data = MC13783_ADC_BPDIV2,
 313         }, {
 314                 /* sentinel */
 315         }
 316 };
 317 MODULE_DEVICE_TABLE(platform, mc13783_adc_idtable);
 318 
 319 static struct platform_driver mc13783_adc_driver = {
 320         .remove         = mc13783_adc_remove,
 321         .driver         = {
 322                 .name   = DRIVER_NAME,
 323         },
 324         .id_table       = mc13783_adc_idtable,
 325 };
 326 
 327 module_platform_driver_probe(mc13783_adc_driver, mc13783_adc_probe);
 328 
 329 MODULE_DESCRIPTION("MC13783 ADC driver");
 330 MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
 331 MODULE_LICENSE("GPL");

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