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 #include <linux/platform_device.h>
22 #include "int340x_thermal_zone.h"
23
24 #define INT3403_TYPE_SENSOR 0x03
25 #define INT3403_TYPE_CHARGER 0x0B
26 #define INT3403_TYPE_BATTERY 0x0C
27 #define INT3403_PERF_CHANGED_EVENT 0x80
28 #define INT3403_THERMAL_EVENT 0x90
29
30 /* Preserved structure for future expandbility */
31 struct int3403_sensor {
32 struct int34x_thermal_zone *int340x_zone;
33 };
34
35 struct int3403_performance_state {
36 u64 performance;
37 u64 power;
38 u64 latency;
39 u64 linear;
40 u64 control;
41 u64 raw_performace;
42 char *raw_unit;
43 int reserved;
44 };
45
46 struct int3403_cdev {
47 struct thermal_cooling_device *cdev;
48 unsigned long max_state;
49 };
50
51 struct int3403_priv {
52 struct platform_device *pdev;
53 struct acpi_device *adev;
54 unsigned long long type;
55 void *priv;
56 };
57
int3403_notify(acpi_handle handle,u32 event,void * data)58 static void int3403_notify(acpi_handle handle,
59 u32 event, void *data)
60 {
61 struct int3403_priv *priv = data;
62 struct int3403_sensor *obj;
63
64 if (!priv)
65 return;
66
67 obj = priv->priv;
68 if (priv->type != INT3403_TYPE_SENSOR || !obj)
69 return;
70
71 switch (event) {
72 case INT3403_PERF_CHANGED_EVENT:
73 break;
74 case INT3403_THERMAL_EVENT:
75 int340x_thermal_zone_device_update(obj->int340x_zone);
76 break;
77 default:
78 dev_err(&priv->pdev->dev, "Unsupported event [0x%x]\n", event);
79 break;
80 }
81 }
82
int3403_sensor_add(struct int3403_priv * priv)83 static int int3403_sensor_add(struct int3403_priv *priv)
84 {
85 int result = 0;
86 struct int3403_sensor *obj;
87
88 obj = devm_kzalloc(&priv->pdev->dev, sizeof(*obj), GFP_KERNEL);
89 if (!obj)
90 return -ENOMEM;
91
92 priv->priv = obj;
93
94 obj->int340x_zone = int340x_thermal_zone_add(priv->adev, NULL);
95 if (IS_ERR(obj->int340x_zone))
96 return PTR_ERR(obj->int340x_zone);
97
98 result = acpi_install_notify_handler(priv->adev->handle,
99 ACPI_DEVICE_NOTIFY, int3403_notify,
100 (void *)priv);
101 if (result)
102 goto err_free_obj;
103
104 return 0;
105
106 err_free_obj:
107 int340x_thermal_zone_remove(obj->int340x_zone);
108 return result;
109 }
110
int3403_sensor_remove(struct int3403_priv * priv)111 static int int3403_sensor_remove(struct int3403_priv *priv)
112 {
113 struct int3403_sensor *obj = priv->priv;
114
115 acpi_remove_notify_handler(priv->adev->handle,
116 ACPI_DEVICE_NOTIFY, int3403_notify);
117 int340x_thermal_zone_remove(obj->int340x_zone);
118
119 return 0;
120 }
121
122 /* INT3403 Cooling devices */
int3403_get_max_state(struct thermal_cooling_device * cdev,unsigned long * state)123 static int int3403_get_max_state(struct thermal_cooling_device *cdev,
124 unsigned long *state)
125 {
126 struct int3403_priv *priv = cdev->devdata;
127 struct int3403_cdev *obj = priv->priv;
128
129 *state = obj->max_state;
130 return 0;
131 }
132
int3403_get_cur_state(struct thermal_cooling_device * cdev,unsigned long * state)133 static int int3403_get_cur_state(struct thermal_cooling_device *cdev,
134 unsigned long *state)
135 {
136 struct int3403_priv *priv = cdev->devdata;
137 unsigned long long level;
138 acpi_status status;
139
140 status = acpi_evaluate_integer(priv->adev->handle, "PPPC", NULL, &level);
141 if (ACPI_SUCCESS(status)) {
142 *state = level;
143 return 0;
144 } else
145 return -EINVAL;
146 }
147
148 static int
int3403_set_cur_state(struct thermal_cooling_device * cdev,unsigned long state)149 int3403_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
150 {
151 struct int3403_priv *priv = cdev->devdata;
152 acpi_status status;
153
154 status = acpi_execute_simple_method(priv->adev->handle, "SPPC", state);
155 if (ACPI_SUCCESS(status))
156 return 0;
157 else
158 return -EINVAL;
159 }
160
161 static const struct thermal_cooling_device_ops int3403_cooling_ops = {
162 .get_max_state = int3403_get_max_state,
163 .get_cur_state = int3403_get_cur_state,
164 .set_cur_state = int3403_set_cur_state,
165 };
166
int3403_cdev_add(struct int3403_priv * priv)167 static int int3403_cdev_add(struct int3403_priv *priv)
168 {
169 int result = 0;
170 acpi_status status;
171 struct int3403_cdev *obj;
172 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
173 union acpi_object *p;
174
175 obj = devm_kzalloc(&priv->pdev->dev, sizeof(*obj), GFP_KERNEL);
176 if (!obj)
177 return -ENOMEM;
178
179 status = acpi_evaluate_object(priv->adev->handle, "PPSS", NULL, &buf);
180 if (ACPI_FAILURE(status))
181 return -ENODEV;
182
183 p = buf.pointer;
184 if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
185 printk(KERN_WARNING "Invalid PPSS data\n");
186 kfree(buf.pointer);
187 return -EFAULT;
188 }
189
190 obj->max_state = p->package.count - 1;
191 obj->cdev =
192 thermal_cooling_device_register(acpi_device_bid(priv->adev),
193 priv, &int3403_cooling_ops);
194 if (IS_ERR(obj->cdev))
195 result = PTR_ERR(obj->cdev);
196
197 priv->priv = obj;
198
199 kfree(buf.pointer);
200 /* TODO: add ACPI notification support */
201
202 return result;
203 }
204
int3403_cdev_remove(struct int3403_priv * priv)205 static int int3403_cdev_remove(struct int3403_priv *priv)
206 {
207 struct int3403_cdev *obj = priv->priv;
208
209 thermal_cooling_device_unregister(obj->cdev);
210 return 0;
211 }
212
int3403_add(struct platform_device * pdev)213 static int int3403_add(struct platform_device *pdev)
214 {
215 struct int3403_priv *priv;
216 int result = 0;
217 acpi_status status;
218
219 priv = devm_kzalloc(&pdev->dev, sizeof(struct int3403_priv),
220 GFP_KERNEL);
221 if (!priv)
222 return -ENOMEM;
223
224 priv->pdev = pdev;
225 priv->adev = ACPI_COMPANION(&(pdev->dev));
226 if (!priv->adev) {
227 result = -EINVAL;
228 goto err;
229 }
230
231 status = acpi_evaluate_integer(priv->adev->handle, "PTYP",
232 NULL, &priv->type);
233 if (ACPI_FAILURE(status)) {
234 result = -EINVAL;
235 goto err;
236 }
237
238 platform_set_drvdata(pdev, priv);
239 switch (priv->type) {
240 case INT3403_TYPE_SENSOR:
241 result = int3403_sensor_add(priv);
242 break;
243 case INT3403_TYPE_CHARGER:
244 case INT3403_TYPE_BATTERY:
245 result = int3403_cdev_add(priv);
246 break;
247 default:
248 result = -EINVAL;
249 }
250
251 if (result)
252 goto err;
253 return result;
254
255 err:
256 return result;
257 }
258
int3403_remove(struct platform_device * pdev)259 static int int3403_remove(struct platform_device *pdev)
260 {
261 struct int3403_priv *priv = platform_get_drvdata(pdev);
262
263 switch (priv->type) {
264 case INT3403_TYPE_SENSOR:
265 int3403_sensor_remove(priv);
266 break;
267 case INT3403_TYPE_CHARGER:
268 case INT3403_TYPE_BATTERY:
269 int3403_cdev_remove(priv);
270 break;
271 default:
272 break;
273 }
274
275 return 0;
276 }
277
278 static const struct acpi_device_id int3403_device_ids[] = {
279 {"INT3403", 0},
280 {"", 0},
281 };
282 MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
283
284 static struct platform_driver int3403_driver = {
285 .probe = int3403_add,
286 .remove = int3403_remove,
287 .driver = {
288 .name = "int3403 thermal",
289 .acpi_match_table = int3403_device_ids,
290 },
291 };
292
293 module_platform_driver(int3403_driver);
294
295 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
296 MODULE_LICENSE("GPL v2");
297 MODULE_DESCRIPTION("ACPI INT3403 thermal driver");
298