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1 | /* |
2 | * ACPI INT3403 thermal driver | |
3 | * Copyright (c) 2013, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | */ | |
14 | ||
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 | ||
33 | struct int3403_sensor { | |
34 | struct thermal_zone_device *tzone; | |
35 | unsigned long *thresholds; | |
36 | }; | |
37 | ||
38 | static 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 | ||
54 | static 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 | ||
70 | static 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 | * get_trip_temp is a mandatory callback but | |
78 | * PATx method doesn't return any value, so return | |
79 | * cached value, which was last set from user space. | |
80 | */ | |
81 | *temp = obj->thresholds[trip]; | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static int sys_get_trip_type(struct thermal_zone_device *thermal, | |
87 | int trip, enum thermal_trip_type *type) | |
88 | { | |
89 | /* Mandatory callback, may not mean much here */ | |
90 | *type = THERMAL_TRIP_PASSIVE; | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | int 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 | ||
121 | static 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 | ||
129 | static 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 | ||
152 | static 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 | /* We have to cache, thresholds can't be readback */ | |
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 | ||
205 | static 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 | ||
215 | ACPI_MODULE_NAME("int3403"); | |
216 | static const struct acpi_device_id int3403_device_ids[] = { | |
217 | {"INT3403", 0}, | |
218 | {"", 0}, | |
219 | }; | |
220 | MODULE_DEVICE_TABLE(acpi, int3403_device_ids); | |
221 | ||
222 | static 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 | ||
233 | module_acpi_driver(acpi_int3403_driver); | |
234 | ||
235 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); | |
236 | MODULE_LICENSE("GPL v2"); | |
237 | MODULE_DESCRIPTION("ACPI INT3403 thermal driver"); |