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) \
28static 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
44DPTF_POWER_SHOW(max_platform_power_mw, PMAX)
45DPTF_POWER_SHOW(platform_power_source, PSRC)
46DPTF_POWER_SHOW(adapter_rating_mw, ARTG)
47DPTF_POWER_SHOW(battery_steady_power_mw, PBSS)
48DPTF_POWER_SHOW(charger_type, CTYP)
49DPTF_POWER_SHOW(rest_of_platform_power_mw, PROP)
50DPTF_POWER_SHOW(max_steady_state_power_mw, PBSS)
51DPTF_POWER_SHOW(high_freq_impedance_mohm, RBHF)
52DPTF_POWER_SHOW(no_load_voltage_mv, VBNL)
53DPTF_POWER_SHOW(current_discharge_capbility_ma, CMPP);
54
55static DEVICE_ATTR_RO(max_platform_power_mw);
56static DEVICE_ATTR_RO(platform_power_source);
57static DEVICE_ATTR_RO(adapter_rating_mw);
58static DEVICE_ATTR_RO(battery_steady_power_mw);
59static DEVICE_ATTR_RO(charger_type);
60static DEVICE_ATTR_RO(rest_of_platform_power_mw);
61static DEVICE_ATTR_RO(max_steady_state_power_mw);
62static DEVICE_ATTR_RO(high_freq_impedance_mohm);
63static DEVICE_ATTR_RO(no_load_voltage_mv);
64static DEVICE_ATTR_RO(current_discharge_capbility_ma);
65
66static 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
84static DEVICE_ATTR_WO(prochot_confirm);
85
86static 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
97static const struct attribute_group dptf_power_attribute_group = {
98	.attrs = dptf_power_attrs,
99	.name = "dptf_power"
100};
101
102static 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
111static 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
123static 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
135static 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
171static 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
211static 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
227static const struct acpi_device_id int3407_device_ids[] = {
228	{"INT3407", 0},
229	{"INT3532", 0},
230	{"INTC1047", 0},
231	{"INTC1050", 0},
232	{"INTC1060", 0},
233	{"INTC1061", 0},
234	{"", 0},
235};
236MODULE_DEVICE_TABLE(acpi, int3407_device_ids);
237
238static struct platform_driver dptf_power_driver = {
239	.probe = dptf_power_add,
240	.remove = dptf_power_remove,
241	.driver = {
242		.name = "dptf_power",
243		.acpi_match_table = int3407_device_ids,
244	},
245};
246
247module_platform_driver(dptf_power_driver);
248
249MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
250MODULE_LICENSE("GPL v2");
251MODULE_DESCRIPTION("ACPI DPTF platform power driver");
252