drivers/acpi/dptf/dptf_power.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * dptf_power:  DPTF platform power driver
   4  * Copyright (c) 2016, Intel Corporation.
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/acpi.h>
  10 #include <linux/platform_device.h>
  11
  12 /*
  13  * Presentation of attributes which are defined for INT3407 and INT3532.
  14  * They are:
  15  * PMAX : Maximum platform power
  16  * PSRC : Platform power source
  17  * ARTG : Adapter rating
  18  * CTYP : Charger type
  19  * PROP : Rest of worst case platform Power
  20  * PBSS : Power Battery Steady State
  21  * RBHF : High Frequency Impedance
  22  * VBNL : Instantaneous No-Load Voltage
  23  * CMPP : Current Discharge Capability
  24  */
  25 #define DPTF_POWER_SHOW(name, object) \
  26 static ssize_t name##_show(struct device *dev,\
  27                            struct device_attribute *attr,\
  28                            char *buf)\
  29 {\
  30         struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
  31         unsigned long long val;\
  32         acpi_status status;\
  33 \
  34         status = acpi_evaluate_integer(acpi_dev->handle, #object,\
  35                                        NULL, &val);\
  36         if (ACPI_SUCCESS(status))\
  37                 return sprintf(buf, "%d\n", (int)val);\
  38         else \
  39                 return -EINVAL;\
  40 }
  41
  42 DPTF_POWER_SHOW(max_platform_power_mw, PMAX)
  43 DPTF_POWER_SHOW(platform_power_source, PSRC)
  44 DPTF_POWER_SHOW(adapter_rating_mw, ARTG)
  45 DPTF_POWER_SHOW(battery_steady_power_mw, PBSS)
  46 DPTF_POWER_SHOW(charger_type, CTYP)
  47 DPTF_POWER_SHOW(rest_of_platform_power_mw, PROP)
  48 DPTF_POWER_SHOW(max_steady_state_power_mw, PBSS)
  49 DPTF_POWER_SHOW(high_freq_impedance_mohm, RBHF)
  50 DPTF_POWER_SHOW(no_load_voltage_mv, VBNL)
  51 DPTF_POWER_SHOW(current_discharge_capbility_ma, CMPP);
  52
  53 static DEVICE_ATTR_RO(max_platform_power_mw);
  54 static DEVICE_ATTR_RO(platform_power_source);
  55 static DEVICE_ATTR_RO(adapter_rating_mw);
  56 static DEVICE_ATTR_RO(battery_steady_power_mw);
  57 static DEVICE_ATTR_RO(charger_type);
  58 static DEVICE_ATTR_RO(rest_of_platform_power_mw);
  59 static DEVICE_ATTR_RO(max_steady_state_power_mw);
  60 static DEVICE_ATTR_RO(high_freq_impedance_mohm);
  61 static DEVICE_ATTR_RO(no_load_voltage_mv);
  62 static DEVICE_ATTR_RO(current_discharge_capbility_ma);
  63
  64 static ssize_t prochot_confirm_store(struct device *dev,
  65                                      struct device_attribute *attr,
  66                                      const char *buf, size_t count)
  67 {
  68         struct acpi_device *acpi_dev = dev_get_drvdata(dev);
  69         acpi_status status;
  70         int seq_no;
  71
  72         if (kstrtouint(buf, 0, &seq_no) < 0)
  73                 return -EINVAL;
  74
  75         status = acpi_execute_simple_method(acpi_dev->handle, "PBOK", seq_no);
  76         if (ACPI_SUCCESS(status))
  77                 return count;
  78
  79         return -EINVAL;
  80 }
  81
  82 static DEVICE_ATTR_WO(prochot_confirm);
  83
  84 static struct attribute *dptf_power_attrs[] = {
  85         &dev_attr_max_platform_power_mw.attr,
  86         &dev_attr_platform_power_source.attr,
  87         &dev_attr_adapter_rating_mw.attr,
  88         &dev_attr_battery_steady_power_mw.attr,
  89         &dev_attr_charger_type.attr,
  90         &dev_attr_rest_of_platform_power_mw.attr,
  91         &dev_attr_prochot_confirm.attr,
  92         NULL
  93 };
  94
  95 static const struct attribute_group dptf_power_attribute_group = {
  96         .attrs = dptf_power_attrs,
  97         .name = "dptf_power"
  98 };
  99
 100 static struct attribute *dptf_battery_attrs[] = {
 101         &dev_attr_max_platform_power_mw.attr,
 102         &dev_attr_max_steady_state_power_mw.attr,
 103         &dev_attr_high_freq_impedance_mohm.attr,
 104         &dev_attr_no_load_voltage_mv.attr,
 105         &dev_attr_current_discharge_capbility_ma.attr,
 106         NULL
 107 };
 108
 109 static const struct attribute_group dptf_battery_attribute_group = {
 110         .attrs = dptf_battery_attrs,
 111         .name = "dptf_battery"
 112 };
 113
 114 #define MAX_POWER_CHANGED               0x80
 115 #define POWER_STATE_CHANGED             0x81
 116 #define STEADY_STATE_POWER_CHANGED      0x83
 117 #define POWER_PROP_CHANGE_EVENT 0x84
 118 #define IMPEDANCE_CHANGED               0x85
 119 #define VOLTAGE_CURRENT_CHANGED 0x86
 120
 121 static long long dptf_participant_type(acpi_handle handle)
 122 {
 123         unsigned long long ptype;
 124         acpi_status status;
 125
 126         status = acpi_evaluate_integer(handle, "PTYP", NULL, &ptype);
 127         if (ACPI_FAILURE(status))
 128                 return -ENODEV;
 129
 130         return ptype;
 131 }
 132
 133 static void dptf_power_notify(acpi_handle handle, u32 event, void *data)
 134 {
 135         struct platform_device *pdev = data;
 136         char *attr;
 137
 138         switch (event) {
 139         case POWER_STATE_CHANGED:
 140                 attr = "platform_power_source";
 141                 break;
 142         case POWER_PROP_CHANGE_EVENT:
 143                 attr = "rest_of_platform_power_mw";
 144                 break;
 145         case MAX_POWER_CHANGED:
 146                 attr = "max_platform_power_mw";
 147                 break;
 148         case STEADY_STATE_POWER_CHANGED:
 149                 attr = "max_steady_state_power_mw";
 150                 break;
 151         case IMPEDANCE_CHANGED:
 152                 attr = "high_freq_impedance_mohm";
 153                 break;
 154         case VOLTAGE_CURRENT_CHANGED:
 155                 attr = "no_load_voltage_mv";
 156                 break;
 157         default:
 158                 dev_err(&pdev->dev, "Unsupported event [0x%x]\n", event);
 159                 return;
 160         }
 161
 162         /*
 163          * Notify that an attribute is changed, so that user space can read
 164          * again.
 165          */
 166         if (dptf_participant_type(handle) == 0x0CULL)
 167                 sysfs_notify(&pdev->dev.kobj, "dptf_battery", attr);
 168         else
 169                 sysfs_notify(&pdev->dev.kobj, "dptf_power", attr);
 170 }
 171
 172 static int dptf_power_add(struct platform_device *pdev)
 173 {
 174         const struct attribute_group *attr_group;
 175         struct acpi_device *acpi_dev;
 176         unsigned long long ptype;
 177         int result;
 178
 179         acpi_dev = ACPI_COMPANION(&(pdev->dev));
 180         if (!acpi_dev)
 181                 return -ENODEV;
 182
 183         ptype = dptf_participant_type(acpi_dev->handle);
 184         if (ptype == 0x11)
 185                 attr_group = &dptf_power_attribute_group;
 186         else if (ptype == 0x0C)
 187                 attr_group = &dptf_battery_attribute_group;
 188         else
 189                 return -ENODEV;
 190
 191         result = acpi_install_notify_handler(acpi_dev->handle,
 192                                              ACPI_DEVICE_NOTIFY,
 193                                              dptf_power_notify,
 194                                              (void *)pdev);
 195         if (result)
 196                 return result;
 197
 198         result = sysfs_create_group(&pdev->dev.kobj,
 199                                     attr_group);
 200         if (result) {
 201                 acpi_remove_notify_handler(acpi_dev->handle,
 202                                            ACPI_DEVICE_NOTIFY,
 203                                            dptf_power_notify);
 204                 return result;
 205         }
 206
 207         platform_set_drvdata(pdev, acpi_dev);
 208
 209         return 0;
 210 }
 211
 212 static void dptf_power_remove(struct platform_device *pdev)
 213 {
 214         struct acpi_device *acpi_dev = platform_get_drvdata(pdev);
 215
 216         acpi_remove_notify_handler(acpi_dev->handle,
 217                                    ACPI_DEVICE_NOTIFY,
 218                                    dptf_power_notify);
 219
 220         if (dptf_participant_type(acpi_dev->handle) == 0x0CULL)
 221                 sysfs_remove_group(&pdev->dev.kobj, &dptf_battery_attribute_group);
 222         else
 223                 sysfs_remove_group(&pdev->dev.kobj, &dptf_power_attribute_group);
 224 }
 225
 226 static const struct acpi_device_id int3407_device_ids[] = {
 227         {"INT3407", 0},
 228         {"INT3532", 0},
 229         {"INTC1047", 0},
 230         {"INTC1050", 0},
 231         {"INTC1060", 0},
 232         {"INTC1061", 0},
 233         {"INTC1065", 0},
 234         {"INTC1066", 0},
 235         {"INTC10A4", 0},
 236         {"INTC10A5", 0},
 237         {"", 0},
 238 };
 239 MODULE_DEVICE_TABLE(acpi, int3407_device_ids);
 240
 241 static struct platform_driver dptf_power_driver = {
 242         .probe = dptf_power_add,
 243         .remove_new = dptf_power_remove,
 244         .driver = {
 245                 .name = "dptf_power",
 246                 .acpi_match_table = int3407_device_ids,
 247         },
 248 };
 249
 250 module_platform_driver(dptf_power_driver);
 251
 252 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 253 MODULE_LICENSE("GPL v2");
 254 MODULE_DESCRIPTION("ACPI DPTF platform power driver");