cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dptf_power.c (6701B)


      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) \
     26static 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
     42DPTF_POWER_SHOW(max_platform_power_mw, PMAX)
     43DPTF_POWER_SHOW(platform_power_source, PSRC)
     44DPTF_POWER_SHOW(adapter_rating_mw, ARTG)
     45DPTF_POWER_SHOW(battery_steady_power_mw, PBSS)
     46DPTF_POWER_SHOW(charger_type, CTYP)
     47DPTF_POWER_SHOW(rest_of_platform_power_mw, PROP)
     48DPTF_POWER_SHOW(max_steady_state_power_mw, PBSS)
     49DPTF_POWER_SHOW(high_freq_impedance_mohm, RBHF)
     50DPTF_POWER_SHOW(no_load_voltage_mv, VBNL)
     51DPTF_POWER_SHOW(current_discharge_capbility_ma, CMPP);
     52
     53static DEVICE_ATTR_RO(max_platform_power_mw);
     54static DEVICE_ATTR_RO(platform_power_source);
     55static DEVICE_ATTR_RO(adapter_rating_mw);
     56static DEVICE_ATTR_RO(battery_steady_power_mw);
     57static DEVICE_ATTR_RO(charger_type);
     58static DEVICE_ATTR_RO(rest_of_platform_power_mw);
     59static DEVICE_ATTR_RO(max_steady_state_power_mw);
     60static DEVICE_ATTR_RO(high_freq_impedance_mohm);
     61static DEVICE_ATTR_RO(no_load_voltage_mv);
     62static DEVICE_ATTR_RO(current_discharge_capbility_ma);
     63
     64static 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
     82static DEVICE_ATTR_WO(prochot_confirm);
     83
     84static 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
     95static const struct attribute_group dptf_power_attribute_group = {
     96	.attrs = dptf_power_attrs,
     97	.name = "dptf_power"
     98};
     99
    100static 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
    109static 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
    121static 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
    133static 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
    172static 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
    212static int 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	return 0;
    226}
    227
    228static const struct acpi_device_id int3407_device_ids[] = {
    229	{"INT3407", 0},
    230	{"INT3532", 0},
    231	{"INTC1047", 0},
    232	{"INTC1050", 0},
    233	{"INTC1060", 0},
    234	{"INTC1061", 0},
    235	{"INTC1065", 0},
    236	{"INTC1066", 0},
    237	{"INTC10A4", 0},
    238	{"INTC10A5", 0},
    239	{"", 0},
    240};
    241MODULE_DEVICE_TABLE(acpi, int3407_device_ids);
    242
    243static struct platform_driver dptf_power_driver = {
    244	.probe = dptf_power_add,
    245	.remove = dptf_power_remove,
    246	.driver = {
    247		.name = "dptf_power",
    248		.acpi_match_table = int3407_device_ids,
    249	},
    250};
    251
    252module_platform_driver(dptf_power_driver);
    253
    254MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
    255MODULE_LICENSE("GPL v2");
    256MODULE_DESCRIPTION("ACPI DPTF platform power driver");