Quelle  dptf_power.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * dptf_power:  DPTF platform power driver
 * Copyright (c) 2016, Intel Corporation.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>

/*
 * Presentation of attributes which are defined for INT3407 and INT3532.
 * They are:
 * PMAX : Maximum platform power
 * PSRC : Platform power source
 * ARTG : Adapter rating
 * CTYP : Charger type
 * PROP : Rest of worst case platform Power
 * PBSS : Power Battery Steady State
 * RBHF : High Frequency Impedance
 * VBNL : Instantaneous No-Load Voltage
 * CMPP : Current Discharge Capability
 */
#define DPTF_POWER_SHOW(name, object) \
static ssize_t name##_show(struct device *dev,\
      struct device_attribute *attr,\
      char *buf)\
{\
 struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
 unsigned long long val;\
 acpi_status status;\
\
 status = acpi_evaluate_integer(acpi_dev->handle, #object,\
           NULL, &val);\
 if (ACPI_SUCCESS(status))\
  return sprintf(buf, "%d\n", (int)val);\
 else \
  return -EINVAL;\
}

DPTF_POWER_SHOW(max_platform_power_mw, PMAX)
DPTF_POWER_SHOW(platform_power_source, PSRC)
DPTF_POWER_SHOW(adapter_rating_mw, ARTG)
DPTF_POWER_SHOW(battery_steady_power_mw, PBSS)
DPTF_POWER_SHOW(charger_type, CTYP)
DPTF_POWER_SHOW(rest_of_platform_power_mw, PROP)
DPTF_POWER_SHOW(max_steady_state_power_mw, PBSS)
DPTF_POWER_SHOW(high_freq_impedance_mohm, RBHF)
DPTF_POWER_SHOW(no_load_voltage_mv, VBNL)
DPTF_POWER_SHOW(current_discharge_capbility_ma, CMPP);

static DEVICE_ATTR_RO(max_platform_power_mw);
static DEVICE_ATTR_RO(platform_power_source);
static DEVICE_ATTR_RO(adapter_rating_mw);
static DEVICE_ATTR_RO(battery_steady_power_mw);
static DEVICE_ATTR_RO(charger_type);
static DEVICE_ATTR_RO(rest_of_platform_power_mw);
static DEVICE_ATTR_RO(max_steady_state_power_mw);
static DEVICE_ATTR_RO(high_freq_impedance_mohm);
static DEVICE_ATTR_RO(no_load_voltage_mv);
static DEVICE_ATTR_RO(current_discharge_capbility_ma);

static ssize_t prochot_confirm_store(struct device *dev,
         struct device_attribute *attr,
         const char *buf, size_t count)
{
 struct acpi_device *acpi_dev = dev_get_drvdata(dev);
 acpi_status status;
 int seq_no;

 if (kstrtouint(buf, 0, &seq_no) < 0)
  return -EINVAL;

 status = acpi_execute_simple_method(acpi_dev->handle, "PBOK", seq_no);
 if (ACPI_SUCCESS(status))
  return count;

 return -EINVAL;
}

static DEVICE_ATTR_WO(prochot_confirm);

static struct attribute *dptf_power_attrs[] = {
 &dev_attr_max_platform_power_mw.attr,
 &dev_attr_platform_power_source.attr,
 &dev_attr_adapter_rating_mw.attr,
 &dev_attr_battery_steady_power_mw.attr,
 &dev_attr_charger_type.attr,
 &dev_attr_rest_of_platform_power_mw.attr,
 &dev_attr_prochot_confirm.attr,
 NULL
};

static const struct attribute_group dptf_power_attribute_group = {
 .attrs = dptf_power_attrs,
 .name = "dptf_power"
};

static struct attribute *dptf_battery_attrs[] = {
 &dev_attr_max_platform_power_mw.attr,
 &dev_attr_max_steady_state_power_mw.attr,
 &dev_attr_high_freq_impedance_mohm.attr,
 &dev_attr_no_load_voltage_mv.attr,
 &dev_attr_current_discharge_capbility_ma.attr,
 NULL
};

static const struct attribute_group dptf_battery_attribute_group = {
 .attrs = dptf_battery_attrs,
 .name = "dptf_battery"
};

#define MAX_POWER_CHANGED  0x80
#define POWER_STATE_CHANGED  0x81
#define STEADY_STATE_POWER_CHANGED 0x83
#define POWER_PROP_CHANGE_EVENT 0x84
#define IMPEDANCE_CHANGED  0x85
#define VOLTAGE_CURRENT_CHANGED 0x86

static long long dptf_participant_type(acpi_handle handle)
{
 unsigned long long ptype;
 acpi_status status;

 status = acpi_evaluate_integer(handle, "PTYP", NULL, &ptype);
 if (ACPI_FAILURE(status))
  return -ENODEV;

 return ptype;
}

static void dptf_power_notify(acpi_handle handle, u32 event, void *data)
{
 struct platform_device *pdev = data;
 char *attr;

 switch (event) {
 case POWER_STATE_CHANGED:
  attr = "platform_power_source";
  break;
 case POWER_PROP_CHANGE_EVENT:
  attr = "rest_of_platform_power_mw";
  break;
 case MAX_POWER_CHANGED:
  attr = "max_platform_power_mw";
  break;
 case STEADY_STATE_POWER_CHANGED:
  attr = "max_steady_state_power_mw";
  break;
 case IMPEDANCE_CHANGED:
  attr = "high_freq_impedance_mohm";
  break;
 case VOLTAGE_CURRENT_CHANGED:
  attr = "no_load_voltage_mv";
  break;
 default:
  dev_err(&pdev->dev, "Unsupported event [0x%x]\n", event);
  return;
 }

 /*
 * Notify that an attribute is changed, so that user space can read
 * again.
 */
 if (dptf_participant_type(handle) == 0x0CULL)
  sysfs_notify(&pdev->dev.kobj, "dptf_battery", attr);
 else
  sysfs_notify(&pdev->dev.kobj, "dptf_power", attr);
}

static int dptf_power_add(struct platform_device *pdev)
{
 const struct attribute_group *attr_group;
 struct acpi_device *acpi_dev;
 unsigned long long ptype;
 int result;

 acpi_dev = ACPI_COMPANION(&(pdev->dev));
 if (!acpi_dev)
  return -ENODEV;

 ptype = dptf_participant_type(acpi_dev->handle);
 if (ptype == 0x11)
  attr_group = &dptf_power_attribute_group;
 else if (ptype == 0x0C)
  attr_group = &dptf_battery_attribute_group;
 else
  return -ENODEV;

 result = acpi_install_notify_handler(acpi_dev->handle,
          ACPI_DEVICE_NOTIFY,
          dptf_power_notify,
          (void *)pdev);
 if (result)
  return result;

 result = sysfs_create_group(&pdev->dev.kobj,
        attr_group);
 if (result) {
  acpi_remove_notify_handler(acpi_dev->handle,
        ACPI_DEVICE_NOTIFY,
        dptf_power_notify);
  return result;
 }

 platform_set_drvdata(pdev, acpi_dev);

 return 0;
}

static void dptf_power_remove(struct platform_device *pdev)
{
 struct acpi_device *acpi_dev = platform_get_drvdata(pdev);

 acpi_remove_notify_handler(acpi_dev->handle,
       ACPI_DEVICE_NOTIFY,
       dptf_power_notify);

 if (dptf_participant_type(acpi_dev->handle) == 0x0CULL)
  sysfs_remove_group(&pdev->dev.kobj, &dptf_battery_attribute_group);
 else
  sysfs_remove_group(&pdev->dev.kobj, &dptf_power_attribute_group);
}

static const struct acpi_device_id int3407_device_ids[] = {
 {"INT3407", 0},
 {"INT3532", 0},
 {"INTC1047", 0},
 {"INTC1050", 0},
 {"INTC1060", 0},
 {"INTC1061", 0},
 {"INTC1065", 0},
 {"INTC1066", 0},
 {"INTC106C", 0},
 {"INTC106D", 0},
 {"INTC10A4", 0},
 {"INTC10A5", 0},
 {"INTC10D8", 0},
 {"INTC10D9", 0},
 {"INTC1100", 0},
 {"INTC1101", 0},
 {"", 0},
};
MODULE_DEVICE_TABLE(acpi, int3407_device_ids);

static struct platform_driver dptf_power_driver = {
 .probe = dptf_power_add,
 .remove = dptf_power_remove,
 .driver = {
  .name = "dptf_power",
  .acpi_match_table = int3407_device_ids,
 },
};

module_platform_driver(dptf_power_driver);

MODULE_AUTHOR("Srinivas Pandruvada ");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ACPI DPTF platform power driver");