1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * ACPI INT3403 thermal driver
4  * Copyright (c) 2013, Intel Corporation.
5  */
6 
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/types.h>
11 #include <linux/acpi.h>
12 #include <linux/thermal.h>
13 #include <linux/platform_device.h>
14 #include "int340x_thermal_zone.h"
15 
16 #define INT3403_TYPE_SENSOR		0x03
17 #define INT3403_TYPE_CHARGER		0x0B
18 #define INT3403_TYPE_BATTERY		0x0C
19 #define INT3403_PERF_CHANGED_EVENT	0x80
20 #define INT3403_PERF_TRIP_POINT_CHANGED	0x81
21 #define INT3403_THERMAL_EVENT		0x90
22 
23 /* Preserved structure for future expandbility */
24 struct int3403_sensor {
25 	struct int34x_thermal_zone *int340x_zone;
26 };
27 
28 struct int3403_performance_state {
29 	u64 performance;
30 	u64 power;
31 	u64 latency;
32 	u64 linear;
33 	u64 control;
34 	u64 raw_performace;
35 	char *raw_unit;
36 	int reserved;
37 };
38 
39 struct int3403_cdev {
40 	struct thermal_cooling_device *cdev;
41 	unsigned long max_state;
42 };
43 
44 struct int3403_priv {
45 	struct platform_device *pdev;
46 	struct acpi_device *adev;
47 	unsigned long long type;
48 	void *priv;
49 };
50 
51 static void int3403_notify(acpi_handle handle,
52 		u32 event, void *data)
53 {
54 	struct int3403_priv *priv = data;
55 	struct int3403_sensor *obj;
56 
57 	if (!priv)
58 		return;
59 
60 	obj = priv->priv;
61 	if (priv->type != INT3403_TYPE_SENSOR || !obj)
62 		return;
63 
64 	switch (event) {
65 	case INT3403_PERF_CHANGED_EVENT:
66 		break;
67 	case INT3403_THERMAL_EVENT:
68 		int340x_thermal_zone_device_update(obj->int340x_zone,
69 						   THERMAL_TRIP_VIOLATED);
70 		break;
71 	case INT3403_PERF_TRIP_POINT_CHANGED:
72 		int340x_thermal_read_trips(obj->int340x_zone);
73 		int340x_thermal_zone_device_update(obj->int340x_zone,
74 						   THERMAL_TRIP_CHANGED);
75 		break;
76 	default:
77 		dev_dbg(&priv->pdev->dev, "Unsupported event [0x%x]\n", event);
78 		break;
79 	}
80 }
81 
82 static int int3403_sensor_add(struct int3403_priv *priv)
83 {
84 	int result = 0;
85 	struct int3403_sensor *obj;
86 
87 	obj = devm_kzalloc(&priv->pdev->dev, sizeof(*obj), GFP_KERNEL);
88 	if (!obj)
89 		return -ENOMEM;
90 
91 	priv->priv = obj;
92 
93 	obj->int340x_zone = int340x_thermal_zone_add(priv->adev, NULL);
94 	if (IS_ERR(obj->int340x_zone))
95 		return PTR_ERR(obj->int340x_zone);
96 
97 	result = acpi_install_notify_handler(priv->adev->handle,
98 			ACPI_DEVICE_NOTIFY, int3403_notify,
99 			(void *)priv);
100 	if (result)
101 		goto err_free_obj;
102 
103 	return 0;
104 
105  err_free_obj:
106 	int340x_thermal_zone_remove(obj->int340x_zone);
107 	return result;
108 }
109 
110 static int int3403_sensor_remove(struct int3403_priv *priv)
111 {
112 	struct int3403_sensor *obj = priv->priv;
113 
114 	acpi_remove_notify_handler(priv->adev->handle,
115 				   ACPI_DEVICE_NOTIFY, int3403_notify);
116 	int340x_thermal_zone_remove(obj->int340x_zone);
117 
118 	return 0;
119 }
120 
121 /* INT3403 Cooling devices */
122 static int int3403_get_max_state(struct thermal_cooling_device *cdev,
123 				 unsigned long *state)
124 {
125 	struct int3403_priv *priv = cdev->devdata;
126 	struct int3403_cdev *obj = priv->priv;
127 
128 	*state = obj->max_state;
129 	return 0;
130 }
131 
132 static int int3403_get_cur_state(struct thermal_cooling_device *cdev,
133 				 unsigned long *state)
134 {
135 	struct int3403_priv *priv = cdev->devdata;
136 	unsigned long long level;
137 	acpi_status status;
138 
139 	status = acpi_evaluate_integer(priv->adev->handle, "PPPC", NULL, &level);
140 	if (ACPI_SUCCESS(status)) {
141 		*state = level;
142 		return 0;
143 	} else
144 		return -EINVAL;
145 }
146 
147 static int
148 int3403_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
149 {
150 	struct int3403_priv *priv = cdev->devdata;
151 	acpi_status status;
152 
153 	status = acpi_execute_simple_method(priv->adev->handle, "SPPC", state);
154 	if (ACPI_SUCCESS(status))
155 		return 0;
156 	else
157 		return -EINVAL;
158 }
159 
160 static const struct thermal_cooling_device_ops int3403_cooling_ops = {
161 	.get_max_state = int3403_get_max_state,
162 	.get_cur_state = int3403_get_cur_state,
163 	.set_cur_state = int3403_set_cur_state,
164 };
165 
166 static int int3403_cdev_add(struct int3403_priv *priv)
167 {
168 	int result = 0;
169 	acpi_status status;
170 	struct int3403_cdev *obj;
171 	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
172 	union acpi_object *p;
173 
174 	obj = devm_kzalloc(&priv->pdev->dev, sizeof(*obj), GFP_KERNEL);
175 	if (!obj)
176 		return -ENOMEM;
177 
178 	status = acpi_evaluate_object(priv->adev->handle, "PPSS", NULL, &buf);
179 	if (ACPI_FAILURE(status))
180 		return -ENODEV;
181 
182 	p = buf.pointer;
183 	if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
184 		pr_warn("Invalid PPSS data\n");
185 		kfree(buf.pointer);
186 		return -EFAULT;
187 	}
188 
189 	priv->priv = obj;
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 	kfree(buf.pointer);
198 	/* TODO: add ACPI notification support */
199 
200 	return result;
201 }
202 
203 static int int3403_cdev_remove(struct int3403_priv *priv)
204 {
205 	struct int3403_cdev *obj = priv->priv;
206 
207 	thermal_cooling_device_unregister(obj->cdev);
208 	return 0;
209 }
210 
211 static int int3403_add(struct platform_device *pdev)
212 {
213 	struct int3403_priv *priv;
214 	int result = 0;
215 	unsigned long long tmp;
216 	acpi_status status;
217 
218 	priv = devm_kzalloc(&pdev->dev, sizeof(struct int3403_priv),
219 			    GFP_KERNEL);
220 	if (!priv)
221 		return -ENOMEM;
222 
223 	priv->pdev = pdev;
224 	priv->adev = ACPI_COMPANION(&(pdev->dev));
225 	if (!priv->adev) {
226 		result = -EINVAL;
227 		goto err;
228 	}
229 
230 
231 	status = acpi_evaluate_integer(priv->adev->handle, "_TMP",
232 				       NULL, &tmp);
233 	if (ACPI_FAILURE(status)) {
234 		status = acpi_evaluate_integer(priv->adev->handle, "PTYP",
235 				       NULL, &priv->type);
236 		if (ACPI_FAILURE(status)) {
237 			result = -EINVAL;
238 			goto err;
239 		}
240 	} else {
241 		priv->type = INT3403_TYPE_SENSOR;
242 	}
243 
244 	platform_set_drvdata(pdev, priv);
245 	switch (priv->type) {
246 	case INT3403_TYPE_SENSOR:
247 		result = int3403_sensor_add(priv);
248 		break;
249 	case INT3403_TYPE_CHARGER:
250 	case INT3403_TYPE_BATTERY:
251 		result = int3403_cdev_add(priv);
252 		break;
253 	default:
254 		result = -EINVAL;
255 	}
256 
257 	if (result)
258 		goto err;
259 	return result;
260 
261 err:
262 	return result;
263 }
264 
265 static int int3403_remove(struct platform_device *pdev)
266 {
267 	struct int3403_priv *priv = platform_get_drvdata(pdev);
268 
269 	switch (priv->type) {
270 	case INT3403_TYPE_SENSOR:
271 		int3403_sensor_remove(priv);
272 		break;
273 	case INT3403_TYPE_CHARGER:
274 	case INT3403_TYPE_BATTERY:
275 		int3403_cdev_remove(priv);
276 		break;
277 	default:
278 		break;
279 	}
280 
281 	return 0;
282 }
283 
284 static const struct acpi_device_id int3403_device_ids[] = {
285 	{"INT3403", 0},
286 	{"INTC1043", 0},
287 	{"INTC1046", 0},
288 	{"", 0},
289 };
290 MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
291 
292 static struct platform_driver int3403_driver = {
293 	.probe = int3403_add,
294 	.remove = int3403_remove,
295 	.driver = {
296 		.name = "int3403 thermal",
297 		.acpi_match_table = int3403_device_ids,
298 	},
299 };
300 
301 module_platform_driver(int3403_driver);
302 
303 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
304 MODULE_LICENSE("GPL v2");
305 MODULE_DESCRIPTION("ACPI INT3403 thermal driver");
306