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15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/types.h>
19#include <linux/acpi.h>
20#include <linux/thermal.h>
21
22#define INT3403_TYPE_SENSOR 0x03
23#define INT3403_PERF_CHANGED_EVENT 0x80
24#define INT3403_THERMAL_EVENT 0x90
25
26#define DECI_KELVIN_TO_MILLI_CELSIUS(t, off) (((t) - (off)) * 100)
27#define KELVIN_OFFSET 2732
28#define MILLI_CELSIUS_TO_DECI_KELVIN(t, off) (((t) / 100) + (off))
29
30#define ACPI_INT3403_CLASS "int3403"
31#define ACPI_INT3403_FILE_STATE "state"
32
33struct int3403_sensor {
34 struct thermal_zone_device *tzone;
35 unsigned long *thresholds;
36};
37
38static int sys_get_curr_temp(struct thermal_zone_device *tzone,
39 unsigned long *temp)
40{
41 struct acpi_device *device = tzone->devdata;
42 unsigned long long tmp;
43 acpi_status status;
44
45 status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp);
46 if (ACPI_FAILURE(status))
47 return -EIO;
48
49 *temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET);
50
51 return 0;
52}
53
54static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
55 int trip, unsigned long *temp)
56{
57 struct acpi_device *device = tzone->devdata;
58 unsigned long long hyst;
59 acpi_status status;
60
61 status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst);
62 if (ACPI_FAILURE(status))
63 return -EIO;
64
65 *temp = DECI_KELVIN_TO_MILLI_CELSIUS(hyst, KELVIN_OFFSET);
66
67 return 0;
68}
69
70static int sys_get_trip_temp(struct thermal_zone_device *tzone,
71 int trip, unsigned long *temp)
72{
73 struct acpi_device *device = tzone->devdata;
74 struct int3403_sensor *obj = acpi_driver_data(device);
75
76
77
78
79
80
81 *temp = obj->thresholds[trip];
82
83 return 0;
84}
85
86static int sys_get_trip_type(struct thermal_zone_device *thermal,
87 int trip, enum thermal_trip_type *type)
88{
89
90 *type = THERMAL_TRIP_PASSIVE;
91
92 return 0;
93}
94
95int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
96 unsigned long temp)
97{
98 struct acpi_device *device = tzone->devdata;
99 acpi_status status;
100 char name[10];
101 int ret = 0;
102 struct int3403_sensor *obj = acpi_driver_data(device);
103
104 snprintf(name, sizeof(name), "PAT%d", trip);
105 if (acpi_has_method(device->handle, name)) {
106 status = acpi_execute_simple_method(device->handle, name,
107 MILLI_CELSIUS_TO_DECI_KELVIN(temp,
108 KELVIN_OFFSET));
109 if (ACPI_FAILURE(status))
110 ret = -EIO;
111 else
112 obj->thresholds[trip] = temp;
113 } else {
114 ret = -EIO;
115 dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
116 }
117
118 return ret;
119}
120
121static struct thermal_zone_device_ops tzone_ops = {
122 .get_temp = sys_get_curr_temp,
123 .get_trip_temp = sys_get_trip_temp,
124 .get_trip_type = sys_get_trip_type,
125 .set_trip_temp = sys_set_trip_temp,
126 .get_trip_hyst = sys_get_trip_hyst,
127};
128
129static void acpi_thermal_notify(struct acpi_device *device, u32 event)
130{
131 struct int3403_sensor *obj;
132
133 if (!device)
134 return;
135
136 obj = acpi_driver_data(device);
137 if (!obj)
138 return;
139
140 switch (event) {
141 case INT3403_PERF_CHANGED_EVENT:
142 break;
143 case INT3403_THERMAL_EVENT:
144 thermal_zone_device_update(obj->tzone);
145 break;
146 default:
147 dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
148 break;
149 }
150}
151
152static int acpi_int3403_add(struct acpi_device *device)
153{
154 int result = 0;
155 unsigned long long ptyp;
156 acpi_status status;
157 struct int3403_sensor *obj;
158 unsigned long long trip_cnt;
159 int trip_mask = 0;
160
161 if (!device)
162 return -EINVAL;
163
164 status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
165 if (ACPI_FAILURE(status))
166 return -EINVAL;
167
168 if (ptyp != INT3403_TYPE_SENSOR)
169 return -EINVAL;
170
171 obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
172 if (!obj)
173 return -ENOMEM;
174
175 device->driver_data = obj;
176
177 status = acpi_evaluate_integer(device->handle, "PATC", NULL,
178 &trip_cnt);
179 if (ACPI_FAILURE(status))
180 trip_cnt = 0;
181
182 if (trip_cnt) {
183
184 obj->thresholds = devm_kzalloc(&device->dev,
185 sizeof(*obj->thresholds) * trip_cnt,
186 GFP_KERNEL);
187 if (!obj->thresholds)
188 return -ENOMEM;
189 trip_mask = BIT(trip_cnt) - 1;
190 }
191 obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
192 trip_cnt, trip_mask, device, &tzone_ops,
193 NULL, 0, 0);
194 if (IS_ERR(obj->tzone)) {
195 result = PTR_ERR(obj->tzone);
196 return result;
197 }
198
199 strcpy(acpi_device_name(device), "INT3403");
200 strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);
201
202 return 0;
203}
204
205static int acpi_int3403_remove(struct acpi_device *device)
206{
207 struct int3403_sensor *obj;
208
209 obj = acpi_driver_data(device);
210 thermal_zone_device_unregister(obj->tzone);
211
212 return 0;
213}
214
215ACPI_MODULE_NAME("int3403");
216static const struct acpi_device_id int3403_device_ids[] = {
217 {"INT3403", 0},
218 {"", 0},
219};
220MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
221
222static struct acpi_driver acpi_int3403_driver = {
223 .name = "INT3403",
224 .class = ACPI_INT3403_CLASS,
225 .ids = int3403_device_ids,
226 .ops = {
227 .add = acpi_int3403_add,
228 .remove = acpi_int3403_remove,
229 .notify = acpi_thermal_notify,
230 },
231};
232
233module_acpi_driver(acpi_int3403_driver);
234
235MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
236MODULE_LICENSE("GPL v2");
237MODULE_DESCRIPTION("ACPI INT3403 thermal driver");
238
