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
prochot_confirm_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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
dptf_participant_type(acpi_handle handle)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
dptf_power_notify(acpi_handle handle,u32 event,void * data)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
dptf_power_add(struct platform_device * pdev)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
dptf_power_remove(struct platform_device * pdev)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 {"INTC1060", 0},
233 {"INTC1061", 0},
234 {"", 0},
235 };
236 MODULE_DEVICE_TABLE(acpi, int3407_device_ids);
237
238 static 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
247 module_platform_driver(dptf_power_driver);
248
249 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
250 MODULE_LICENSE("GPL v2");
251 MODULE_DESCRIPTION("ACPI DPTF platform power driver");
252