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